1 /*
2  *  fs/nfs/nfs4proc.c
3  *
4  *  Client-side procedure declarations for NFSv4.
5  *
6  *  Copyright (c) 2002 The Regents of the University of Michigan.
7  *  All rights reserved.
8  *
9  *  Kendrick Smith <kmsmith@umich.edu>
10  *  Andy Adamson   <andros@umich.edu>
11  *
12  *  Redistribution and use in source and binary forms, with or without
13  *  modification, are permitted provided that the following conditions
14  *  are met:
15  *
16  *  1. Redistributions of source code must retain the above copyright
17  *     notice, this list of conditions and the following disclaimer.
18  *  2. Redistributions in binary form must reproduce the above copyright
19  *     notice, this list of conditions and the following disclaimer in the
20  *     documentation and/or other materials provided with the distribution.
21  *  3. Neither the name of the University nor the names of its
22  *     contributors may be used to endorse or promote products derived
23  *     from this software without specific prior written permission.
24  *
25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 #include <linux/mm.h>
39 #include <linux/delay.h>
40 #include <linux/errno.h>
41 #include <linux/string.h>
42 #include <linux/ratelimit.h>
43 #include <linux/printk.h>
44 #include <linux/slab.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/nfs.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/nfs_page.h>
50 #include <linux/nfs_mount.h>
51 #include <linux/namei.h>
52 #include <linux/mount.h>
53 #include <linux/module.h>
54 #include <linux/xattr.h>
55 #include <linux/utsname.h>
56 #include <linux/freezer.h>
57 #include <linux/iversion.h>
58 
59 #include "nfs4_fs.h"
60 #include "delegation.h"
61 #include "internal.h"
62 #include "iostat.h"
63 #include "callback.h"
64 #include "pnfs.h"
65 #include "netns.h"
66 #include "sysfs.h"
67 #include "nfs4idmap.h"
68 #include "nfs4session.h"
69 #include "fscache.h"
70 #include "nfs42.h"
71 
72 #include "nfs4trace.h"
73 
74 #define NFSDBG_FACILITY		NFSDBG_PROC
75 
76 #define NFS4_BITMASK_SZ		3
77 
78 #define NFS4_POLL_RETRY_MIN	(HZ/10)
79 #define NFS4_POLL_RETRY_MAX	(15*HZ)
80 
81 /* file attributes which can be mapped to nfs attributes */
82 #define NFS4_VALID_ATTRS (ATTR_MODE \
83 	| ATTR_UID \
84 	| ATTR_GID \
85 	| ATTR_SIZE \
86 	| ATTR_ATIME \
87 	| ATTR_MTIME \
88 	| ATTR_CTIME \
89 	| ATTR_ATIME_SET \
90 	| ATTR_MTIME_SET)
91 
92 struct nfs4_opendata;
93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
97 			      struct nfs_fattr *fattr, struct inode *inode);
98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
99 			    struct nfs_fattr *fattr, struct iattr *sattr,
100 			    struct nfs_open_context *ctx, struct nfs4_label *ilabel);
101 #ifdef CONFIG_NFS_V4_1
102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
103 		const struct cred *cred,
104 		struct nfs4_slot *slot,
105 		bool is_privileged);
106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
107 		const struct cred *);
108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
109 		const struct cred *, bool);
110 #endif
111 
112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
113 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
115 	struct iattr *sattr, struct nfs4_label *label)
116 {
117 	int err;
118 
119 	if (label == NULL)
120 		return NULL;
121 
122 	if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
123 		return NULL;
124 
125 	err = security_dentry_init_security(dentry, sattr->ia_mode,
126 				&dentry->d_name, NULL,
127 				(void **)&label->label, &label->len);
128 	if (err == 0)
129 		return label;
130 
131 	return NULL;
132 }
133 static inline void
nfs4_label_release_security(struct nfs4_label * label)134 nfs4_label_release_security(struct nfs4_label *label)
135 {
136 	if (label)
137 		security_release_secctx(label->label, label->len);
138 }
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)139 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
140 {
141 	if (label)
142 		return server->attr_bitmask;
143 
144 	return server->attr_bitmask_nl;
145 }
146 #else
147 static inline struct nfs4_label *
nfs4_label_init_security(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * l)148 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
149 	struct iattr *sattr, struct nfs4_label *l)
150 { return NULL; }
151 static inline void
nfs4_label_release_security(struct nfs4_label * label)152 nfs4_label_release_security(struct nfs4_label *label)
153 { return; }
154 static inline u32 *
nfs4_bitmask(struct nfs_server * server,struct nfs4_label * label)155 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
156 { return server->attr_bitmask; }
157 #endif
158 
159 /* Prevent leaks of NFSv4 errors into userland */
nfs4_map_errors(int err)160 static int nfs4_map_errors(int err)
161 {
162 	if (err >= -1000)
163 		return err;
164 	switch (err) {
165 	case -NFS4ERR_RESOURCE:
166 	case -NFS4ERR_LAYOUTTRYLATER:
167 	case -NFS4ERR_RECALLCONFLICT:
168 		return -EREMOTEIO;
169 	case -NFS4ERR_WRONGSEC:
170 	case -NFS4ERR_WRONG_CRED:
171 		return -EPERM;
172 	case -NFS4ERR_BADOWNER:
173 	case -NFS4ERR_BADNAME:
174 		return -EINVAL;
175 	case -NFS4ERR_SHARE_DENIED:
176 		return -EACCES;
177 	case -NFS4ERR_MINOR_VERS_MISMATCH:
178 		return -EPROTONOSUPPORT;
179 	case -NFS4ERR_FILE_OPEN:
180 		return -EBUSY;
181 	case -NFS4ERR_NOT_SAME:
182 		return -ENOTSYNC;
183 	default:
184 		dprintk("%s could not handle NFSv4 error %d\n",
185 				__func__, -err);
186 		break;
187 	}
188 	return -EIO;
189 }
190 
191 /*
192  * This is our standard bitmap for GETATTR requests.
193  */
194 const u32 nfs4_fattr_bitmap[3] = {
195 	FATTR4_WORD0_TYPE
196 	| FATTR4_WORD0_CHANGE
197 	| FATTR4_WORD0_SIZE
198 	| FATTR4_WORD0_FSID
199 	| FATTR4_WORD0_FILEID,
200 	FATTR4_WORD1_MODE
201 	| FATTR4_WORD1_NUMLINKS
202 	| FATTR4_WORD1_OWNER
203 	| FATTR4_WORD1_OWNER_GROUP
204 	| FATTR4_WORD1_RAWDEV
205 	| FATTR4_WORD1_SPACE_USED
206 	| FATTR4_WORD1_TIME_ACCESS
207 	| FATTR4_WORD1_TIME_METADATA
208 	| FATTR4_WORD1_TIME_MODIFY
209 	| FATTR4_WORD1_MOUNTED_ON_FILEID,
210 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
211 	FATTR4_WORD2_SECURITY_LABEL
212 #endif
213 };
214 
215 static const u32 nfs4_pnfs_open_bitmap[3] = {
216 	FATTR4_WORD0_TYPE
217 	| FATTR4_WORD0_CHANGE
218 	| FATTR4_WORD0_SIZE
219 	| FATTR4_WORD0_FSID
220 	| FATTR4_WORD0_FILEID,
221 	FATTR4_WORD1_MODE
222 	| FATTR4_WORD1_NUMLINKS
223 	| FATTR4_WORD1_OWNER
224 	| FATTR4_WORD1_OWNER_GROUP
225 	| FATTR4_WORD1_RAWDEV
226 	| FATTR4_WORD1_SPACE_USED
227 	| FATTR4_WORD1_TIME_ACCESS
228 	| FATTR4_WORD1_TIME_METADATA
229 	| FATTR4_WORD1_TIME_MODIFY,
230 	FATTR4_WORD2_MDSTHRESHOLD
231 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
232 	| FATTR4_WORD2_SECURITY_LABEL
233 #endif
234 };
235 
236 static const u32 nfs4_open_noattr_bitmap[3] = {
237 	FATTR4_WORD0_TYPE
238 	| FATTR4_WORD0_FILEID,
239 };
240 
241 const u32 nfs4_statfs_bitmap[3] = {
242 	FATTR4_WORD0_FILES_AVAIL
243 	| FATTR4_WORD0_FILES_FREE
244 	| FATTR4_WORD0_FILES_TOTAL,
245 	FATTR4_WORD1_SPACE_AVAIL
246 	| FATTR4_WORD1_SPACE_FREE
247 	| FATTR4_WORD1_SPACE_TOTAL
248 };
249 
250 const u32 nfs4_pathconf_bitmap[3] = {
251 	FATTR4_WORD0_MAXLINK
252 	| FATTR4_WORD0_MAXNAME,
253 	0
254 };
255 
256 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
257 			| FATTR4_WORD0_MAXREAD
258 			| FATTR4_WORD0_MAXWRITE
259 			| FATTR4_WORD0_LEASE_TIME,
260 			FATTR4_WORD1_TIME_DELTA
261 			| FATTR4_WORD1_FS_LAYOUT_TYPES,
262 			FATTR4_WORD2_LAYOUT_BLKSIZE
263 			| FATTR4_WORD2_CLONE_BLKSIZE
264 			| FATTR4_WORD2_CHANGE_ATTR_TYPE
265 			| FATTR4_WORD2_XATTR_SUPPORT
266 };
267 
268 const u32 nfs4_fs_locations_bitmap[3] = {
269 	FATTR4_WORD0_CHANGE
270 	| FATTR4_WORD0_SIZE
271 	| FATTR4_WORD0_FSID
272 	| FATTR4_WORD0_FILEID
273 	| FATTR4_WORD0_FS_LOCATIONS,
274 	FATTR4_WORD1_OWNER
275 	| FATTR4_WORD1_OWNER_GROUP
276 	| FATTR4_WORD1_RAWDEV
277 	| FATTR4_WORD1_SPACE_USED
278 	| FATTR4_WORD1_TIME_ACCESS
279 	| FATTR4_WORD1_TIME_METADATA
280 	| FATTR4_WORD1_TIME_MODIFY
281 	| FATTR4_WORD1_MOUNTED_ON_FILEID,
282 };
283 
nfs4_bitmap_copy_adjust(__u32 * dst,const __u32 * src,struct inode * inode,unsigned long flags)284 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
285 				    struct inode *inode, unsigned long flags)
286 {
287 	unsigned long cache_validity;
288 
289 	memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
290 	if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
291 		return;
292 
293 	cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
294 
295 	/* Remove the attributes over which we have full control */
296 	dst[1] &= ~FATTR4_WORD1_RAWDEV;
297 	if (!(cache_validity & NFS_INO_INVALID_SIZE))
298 		dst[0] &= ~FATTR4_WORD0_SIZE;
299 
300 	if (!(cache_validity & NFS_INO_INVALID_CHANGE))
301 		dst[0] &= ~FATTR4_WORD0_CHANGE;
302 
303 	if (!(cache_validity & NFS_INO_INVALID_MODE))
304 		dst[1] &= ~FATTR4_WORD1_MODE;
305 	if (!(cache_validity & NFS_INO_INVALID_OTHER))
306 		dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
307 }
308 
nfs4_setup_readdir(u64 cookie,__be32 * verifier,struct dentry * dentry,struct nfs4_readdir_arg * readdir)309 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
310 		struct nfs4_readdir_arg *readdir)
311 {
312 	unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
313 	__be32 *start, *p;
314 
315 	if (cookie > 2) {
316 		readdir->cookie = cookie;
317 		memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
318 		return;
319 	}
320 
321 	readdir->cookie = 0;
322 	memset(&readdir->verifier, 0, sizeof(readdir->verifier));
323 	if (cookie == 2)
324 		return;
325 
326 	/*
327 	 * NFSv4 servers do not return entries for '.' and '..'
328 	 * Therefore, we fake these entries here.  We let '.'
329 	 * have cookie 0 and '..' have cookie 1.  Note that
330 	 * when talking to the server, we always send cookie 0
331 	 * instead of 1 or 2.
332 	 */
333 	start = p = kmap_atomic(*readdir->pages);
334 
335 	if (cookie == 0) {
336 		*p++ = xdr_one;                                  /* next */
337 		*p++ = xdr_zero;                   /* cookie, first word */
338 		*p++ = xdr_one;                   /* cookie, second word */
339 		*p++ = xdr_one;                             /* entry len */
340 		memcpy(p, ".\0\0\0", 4);                        /* entry */
341 		p++;
342 		*p++ = xdr_one;                         /* bitmap length */
343 		*p++ = htonl(attrs);                           /* bitmap */
344 		*p++ = htonl(12);             /* attribute buffer length */
345 		*p++ = htonl(NF4DIR);
346 		p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
347 	}
348 
349 	*p++ = xdr_one;                                  /* next */
350 	*p++ = xdr_zero;                   /* cookie, first word */
351 	*p++ = xdr_two;                   /* cookie, second word */
352 	*p++ = xdr_two;                             /* entry len */
353 	memcpy(p, "..\0\0", 4);                         /* entry */
354 	p++;
355 	*p++ = xdr_one;                         /* bitmap length */
356 	*p++ = htonl(attrs);                           /* bitmap */
357 	*p++ = htonl(12);             /* attribute buffer length */
358 	*p++ = htonl(NF4DIR);
359 	p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
360 
361 	readdir->pgbase = (char *)p - (char *)start;
362 	readdir->count -= readdir->pgbase;
363 	kunmap_atomic(start);
364 }
365 
nfs4_fattr_set_prechange(struct nfs_fattr * fattr,u64 version)366 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
367 {
368 	if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
369 		fattr->pre_change_attr = version;
370 		fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
371 	}
372 }
373 
nfs4_test_and_free_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)374 static void nfs4_test_and_free_stateid(struct nfs_server *server,
375 		nfs4_stateid *stateid,
376 		const struct cred *cred)
377 {
378 	const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
379 
380 	ops->test_and_free_expired(server, stateid, cred);
381 }
382 
__nfs4_free_revoked_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)383 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
384 		nfs4_stateid *stateid,
385 		const struct cred *cred)
386 {
387 	stateid->type = NFS4_REVOKED_STATEID_TYPE;
388 	nfs4_test_and_free_stateid(server, stateid, cred);
389 }
390 
nfs4_free_revoked_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred)391 static void nfs4_free_revoked_stateid(struct nfs_server *server,
392 		const nfs4_stateid *stateid,
393 		const struct cred *cred)
394 {
395 	nfs4_stateid tmp;
396 
397 	nfs4_stateid_copy(&tmp, stateid);
398 	__nfs4_free_revoked_stateid(server, &tmp, cred);
399 }
400 
nfs4_update_delay(long * timeout)401 static long nfs4_update_delay(long *timeout)
402 {
403 	long ret;
404 	if (!timeout)
405 		return NFS4_POLL_RETRY_MAX;
406 	if (*timeout <= 0)
407 		*timeout = NFS4_POLL_RETRY_MIN;
408 	if (*timeout > NFS4_POLL_RETRY_MAX)
409 		*timeout = NFS4_POLL_RETRY_MAX;
410 	ret = *timeout;
411 	*timeout <<= 1;
412 	return ret;
413 }
414 
nfs4_delay_killable(long * timeout)415 static int nfs4_delay_killable(long *timeout)
416 {
417 	might_sleep();
418 
419 	freezable_schedule_timeout_killable_unsafe(
420 		nfs4_update_delay(timeout));
421 	if (!__fatal_signal_pending(current))
422 		return 0;
423 	return -EINTR;
424 }
425 
nfs4_delay_interruptible(long * timeout)426 static int nfs4_delay_interruptible(long *timeout)
427 {
428 	might_sleep();
429 
430 	freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout));
431 	if (!signal_pending(current))
432 		return 0;
433 	return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
434 }
435 
nfs4_delay(long * timeout,bool interruptible)436 static int nfs4_delay(long *timeout, bool interruptible)
437 {
438 	if (interruptible)
439 		return nfs4_delay_interruptible(timeout);
440 	return nfs4_delay_killable(timeout);
441 }
442 
443 static const nfs4_stateid *
nfs4_recoverable_stateid(const nfs4_stateid * stateid)444 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
445 {
446 	if (!stateid)
447 		return NULL;
448 	switch (stateid->type) {
449 	case NFS4_OPEN_STATEID_TYPE:
450 	case NFS4_LOCK_STATEID_TYPE:
451 	case NFS4_DELEGATION_STATEID_TYPE:
452 		return stateid;
453 	default:
454 		break;
455 	}
456 	return NULL;
457 }
458 
459 /* This is the error handling routine for processes that are allowed
460  * to sleep.
461  */
nfs4_do_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)462 static int nfs4_do_handle_exception(struct nfs_server *server,
463 		int errorcode, struct nfs4_exception *exception)
464 {
465 	struct nfs_client *clp = server->nfs_client;
466 	struct nfs4_state *state = exception->state;
467 	const nfs4_stateid *stateid;
468 	struct inode *inode = exception->inode;
469 	int ret = errorcode;
470 
471 	exception->delay = 0;
472 	exception->recovering = 0;
473 	exception->retry = 0;
474 
475 	stateid = nfs4_recoverable_stateid(exception->stateid);
476 	if (stateid == NULL && state != NULL)
477 		stateid = nfs4_recoverable_stateid(&state->stateid);
478 
479 	switch(errorcode) {
480 		case 0:
481 			return 0;
482 		case -NFS4ERR_BADHANDLE:
483 		case -ESTALE:
484 			if (inode != NULL && S_ISREG(inode->i_mode))
485 				pnfs_destroy_layout(NFS_I(inode));
486 			break;
487 		case -NFS4ERR_DELEG_REVOKED:
488 		case -NFS4ERR_ADMIN_REVOKED:
489 		case -NFS4ERR_EXPIRED:
490 		case -NFS4ERR_BAD_STATEID:
491 		case -NFS4ERR_PARTNER_NO_AUTH:
492 			if (inode != NULL && stateid != NULL) {
493 				nfs_inode_find_state_and_recover(inode,
494 						stateid);
495 				goto wait_on_recovery;
496 			}
497 			fallthrough;
498 		case -NFS4ERR_OPENMODE:
499 			if (inode) {
500 				int err;
501 
502 				err = nfs_async_inode_return_delegation(inode,
503 						stateid);
504 				if (err == 0)
505 					goto wait_on_recovery;
506 				if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
507 					exception->retry = 1;
508 					break;
509 				}
510 			}
511 			if (state == NULL)
512 				break;
513 			ret = nfs4_schedule_stateid_recovery(server, state);
514 			if (ret < 0)
515 				break;
516 			goto wait_on_recovery;
517 		case -NFS4ERR_STALE_STATEID:
518 		case -NFS4ERR_STALE_CLIENTID:
519 			nfs4_schedule_lease_recovery(clp);
520 			goto wait_on_recovery;
521 		case -NFS4ERR_MOVED:
522 			ret = nfs4_schedule_migration_recovery(server);
523 			if (ret < 0)
524 				break;
525 			goto wait_on_recovery;
526 		case -NFS4ERR_LEASE_MOVED:
527 			nfs4_schedule_lease_moved_recovery(clp);
528 			goto wait_on_recovery;
529 #if defined(CONFIG_NFS_V4_1)
530 		case -NFS4ERR_BADSESSION:
531 		case -NFS4ERR_BADSLOT:
532 		case -NFS4ERR_BAD_HIGH_SLOT:
533 		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
534 		case -NFS4ERR_DEADSESSION:
535 		case -NFS4ERR_SEQ_FALSE_RETRY:
536 		case -NFS4ERR_SEQ_MISORDERED:
537 			/* Handled in nfs41_sequence_process() */
538 			goto wait_on_recovery;
539 #endif /* defined(CONFIG_NFS_V4_1) */
540 		case -NFS4ERR_FILE_OPEN:
541 			if (exception->timeout > HZ) {
542 				/* We have retried a decent amount, time to
543 				 * fail
544 				 */
545 				ret = -EBUSY;
546 				break;
547 			}
548 			fallthrough;
549 		case -NFS4ERR_DELAY:
550 			nfs_inc_server_stats(server, NFSIOS_DELAY);
551 			fallthrough;
552 		case -NFS4ERR_GRACE:
553 		case -NFS4ERR_LAYOUTTRYLATER:
554 		case -NFS4ERR_RECALLCONFLICT:
555 			exception->delay = 1;
556 			return 0;
557 
558 		case -NFS4ERR_RETRY_UNCACHED_REP:
559 		case -NFS4ERR_OLD_STATEID:
560 			exception->retry = 1;
561 			break;
562 		case -NFS4ERR_BADOWNER:
563 			/* The following works around a Linux server bug! */
564 		case -NFS4ERR_BADNAME:
565 			if (server->caps & NFS_CAP_UIDGID_NOMAP) {
566 				server->caps &= ~NFS_CAP_UIDGID_NOMAP;
567 				exception->retry = 1;
568 				printk(KERN_WARNING "NFS: v4 server %s "
569 						"does not accept raw "
570 						"uid/gids. "
571 						"Reenabling the idmapper.\n",
572 						server->nfs_client->cl_hostname);
573 			}
574 	}
575 	/* We failed to handle the error */
576 	return nfs4_map_errors(ret);
577 wait_on_recovery:
578 	exception->recovering = 1;
579 	return 0;
580 }
581 
582 /* This is the error handling routine for processes that are allowed
583  * to sleep.
584  */
nfs4_handle_exception(struct nfs_server * server,int errorcode,struct nfs4_exception * exception)585 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
586 {
587 	struct nfs_client *clp = server->nfs_client;
588 	int ret;
589 
590 	ret = nfs4_do_handle_exception(server, errorcode, exception);
591 	if (exception->delay) {
592 		ret = nfs4_delay(&exception->timeout,
593 				exception->interruptible);
594 		goto out_retry;
595 	}
596 	if (exception->recovering) {
597 		if (exception->task_is_privileged)
598 			return -EDEADLOCK;
599 		ret = nfs4_wait_clnt_recover(clp);
600 		if (test_bit(NFS_MIG_FAILED, &server->mig_status))
601 			return -EIO;
602 		goto out_retry;
603 	}
604 	return ret;
605 out_retry:
606 	if (ret == 0)
607 		exception->retry = 1;
608 	return ret;
609 }
610 
611 static int
nfs4_async_handle_exception(struct rpc_task * task,struct nfs_server * server,int errorcode,struct nfs4_exception * exception)612 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
613 		int errorcode, struct nfs4_exception *exception)
614 {
615 	struct nfs_client *clp = server->nfs_client;
616 	int ret;
617 
618 	ret = nfs4_do_handle_exception(server, errorcode, exception);
619 	if (exception->delay) {
620 		rpc_delay(task, nfs4_update_delay(&exception->timeout));
621 		goto out_retry;
622 	}
623 	if (exception->recovering) {
624 		if (exception->task_is_privileged)
625 			return -EDEADLOCK;
626 		rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
627 		if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
628 			rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
629 		goto out_retry;
630 	}
631 	if (test_bit(NFS_MIG_FAILED, &server->mig_status))
632 		ret = -EIO;
633 	return ret;
634 out_retry:
635 	if (ret == 0) {
636 		exception->retry = 1;
637 		/*
638 		 * For NFS4ERR_MOVED, the client transport will need to
639 		 * be recomputed after migration recovery has completed.
640 		 */
641 		if (errorcode == -NFS4ERR_MOVED)
642 			rpc_task_release_transport(task);
643 	}
644 	return ret;
645 }
646 
647 int
nfs4_async_handle_error(struct rpc_task * task,struct nfs_server * server,struct nfs4_state * state,long * timeout)648 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
649 			struct nfs4_state *state, long *timeout)
650 {
651 	struct nfs4_exception exception = {
652 		.state = state,
653 	};
654 
655 	if (task->tk_status >= 0)
656 		return 0;
657 	if (timeout)
658 		exception.timeout = *timeout;
659 	task->tk_status = nfs4_async_handle_exception(task, server,
660 			task->tk_status,
661 			&exception);
662 	if (exception.delay && timeout)
663 		*timeout = exception.timeout;
664 	if (exception.retry)
665 		return -EAGAIN;
666 	return 0;
667 }
668 
669 /*
670  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
671  * or 'false' otherwise.
672  */
_nfs4_is_integrity_protected(struct nfs_client * clp)673 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
674 {
675 	rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
676 	return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
677 }
678 
do_renew_lease(struct nfs_client * clp,unsigned long timestamp)679 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
680 {
681 	spin_lock(&clp->cl_lock);
682 	if (time_before(clp->cl_last_renewal,timestamp))
683 		clp->cl_last_renewal = timestamp;
684 	spin_unlock(&clp->cl_lock);
685 }
686 
renew_lease(const struct nfs_server * server,unsigned long timestamp)687 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
688 {
689 	struct nfs_client *clp = server->nfs_client;
690 
691 	if (!nfs4_has_session(clp))
692 		do_renew_lease(clp, timestamp);
693 }
694 
695 struct nfs4_call_sync_data {
696 	const struct nfs_server *seq_server;
697 	struct nfs4_sequence_args *seq_args;
698 	struct nfs4_sequence_res *seq_res;
699 };
700 
nfs4_init_sequence(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply,int privileged)701 void nfs4_init_sequence(struct nfs4_sequence_args *args,
702 			struct nfs4_sequence_res *res, int cache_reply,
703 			int privileged)
704 {
705 	args->sa_slot = NULL;
706 	args->sa_cache_this = cache_reply;
707 	args->sa_privileged = privileged;
708 
709 	res->sr_slot = NULL;
710 }
711 
nfs40_sequence_free_slot(struct nfs4_sequence_res * res)712 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
713 {
714 	struct nfs4_slot *slot = res->sr_slot;
715 	struct nfs4_slot_table *tbl;
716 
717 	tbl = slot->table;
718 	spin_lock(&tbl->slot_tbl_lock);
719 	if (!nfs41_wake_and_assign_slot(tbl, slot))
720 		nfs4_free_slot(tbl, slot);
721 	spin_unlock(&tbl->slot_tbl_lock);
722 
723 	res->sr_slot = NULL;
724 }
725 
nfs40_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)726 static int nfs40_sequence_done(struct rpc_task *task,
727 			       struct nfs4_sequence_res *res)
728 {
729 	if (res->sr_slot != NULL)
730 		nfs40_sequence_free_slot(res);
731 	return 1;
732 }
733 
734 #if defined(CONFIG_NFS_V4_1)
735 
nfs41_release_slot(struct nfs4_slot * slot)736 static void nfs41_release_slot(struct nfs4_slot *slot)
737 {
738 	struct nfs4_session *session;
739 	struct nfs4_slot_table *tbl;
740 	bool send_new_highest_used_slotid = false;
741 
742 	if (!slot)
743 		return;
744 	tbl = slot->table;
745 	session = tbl->session;
746 
747 	/* Bump the slot sequence number */
748 	if (slot->seq_done)
749 		slot->seq_nr++;
750 	slot->seq_done = 0;
751 
752 	spin_lock(&tbl->slot_tbl_lock);
753 	/* Be nice to the server: try to ensure that the last transmitted
754 	 * value for highest_user_slotid <= target_highest_slotid
755 	 */
756 	if (tbl->highest_used_slotid > tbl->target_highest_slotid)
757 		send_new_highest_used_slotid = true;
758 
759 	if (nfs41_wake_and_assign_slot(tbl, slot)) {
760 		send_new_highest_used_slotid = false;
761 		goto out_unlock;
762 	}
763 	nfs4_free_slot(tbl, slot);
764 
765 	if (tbl->highest_used_slotid != NFS4_NO_SLOT)
766 		send_new_highest_used_slotid = false;
767 out_unlock:
768 	spin_unlock(&tbl->slot_tbl_lock);
769 	if (send_new_highest_used_slotid)
770 		nfs41_notify_server(session->clp);
771 	if (waitqueue_active(&tbl->slot_waitq))
772 		wake_up_all(&tbl->slot_waitq);
773 }
774 
nfs41_sequence_free_slot(struct nfs4_sequence_res * res)775 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
776 {
777 	nfs41_release_slot(res->sr_slot);
778 	res->sr_slot = NULL;
779 }
780 
nfs4_slot_sequence_record_sent(struct nfs4_slot * slot,u32 seqnr)781 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
782 		u32 seqnr)
783 {
784 	if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
785 		slot->seq_nr_highest_sent = seqnr;
786 }
nfs4_slot_sequence_acked(struct nfs4_slot * slot,u32 seqnr)787 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
788 {
789 	nfs4_slot_sequence_record_sent(slot, seqnr);
790 	slot->seq_nr_last_acked = seqnr;
791 }
792 
nfs4_probe_sequence(struct nfs_client * client,const struct cred * cred,struct nfs4_slot * slot)793 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
794 				struct nfs4_slot *slot)
795 {
796 	struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
797 	if (!IS_ERR(task))
798 		rpc_put_task_async(task);
799 }
800 
nfs41_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)801 static int nfs41_sequence_process(struct rpc_task *task,
802 		struct nfs4_sequence_res *res)
803 {
804 	struct nfs4_session *session;
805 	struct nfs4_slot *slot = res->sr_slot;
806 	struct nfs_client *clp;
807 	int status;
808 	int ret = 1;
809 
810 	if (slot == NULL)
811 		goto out_noaction;
812 	/* don't increment the sequence number if the task wasn't sent */
813 	if (!RPC_WAS_SENT(task) || slot->seq_done)
814 		goto out;
815 
816 	session = slot->table->session;
817 	clp = session->clp;
818 
819 	trace_nfs4_sequence_done(session, res);
820 
821 	status = res->sr_status;
822 	if (task->tk_status == -NFS4ERR_DEADSESSION)
823 		status = -NFS4ERR_DEADSESSION;
824 
825 	/* Check the SEQUENCE operation status */
826 	switch (status) {
827 	case 0:
828 		/* Mark this sequence number as having been acked */
829 		nfs4_slot_sequence_acked(slot, slot->seq_nr);
830 		/* Update the slot's sequence and clientid lease timer */
831 		slot->seq_done = 1;
832 		do_renew_lease(clp, res->sr_timestamp);
833 		/* Check sequence flags */
834 		nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
835 				!!slot->privileged);
836 		nfs41_update_target_slotid(slot->table, slot, res);
837 		break;
838 	case 1:
839 		/*
840 		 * sr_status remains 1 if an RPC level error occurred.
841 		 * The server may or may not have processed the sequence
842 		 * operation..
843 		 */
844 		nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
845 		slot->seq_done = 1;
846 		goto out;
847 	case -NFS4ERR_DELAY:
848 		/* The server detected a resend of the RPC call and
849 		 * returned NFS4ERR_DELAY as per Section 2.10.6.2
850 		 * of RFC5661.
851 		 */
852 		dprintk("%s: slot=%u seq=%u: Operation in progress\n",
853 			__func__,
854 			slot->slot_nr,
855 			slot->seq_nr);
856 		goto out_retry;
857 	case -NFS4ERR_RETRY_UNCACHED_REP:
858 	case -NFS4ERR_SEQ_FALSE_RETRY:
859 		/*
860 		 * The server thinks we tried to replay a request.
861 		 * Retry the call after bumping the sequence ID.
862 		 */
863 		nfs4_slot_sequence_acked(slot, slot->seq_nr);
864 		goto retry_new_seq;
865 	case -NFS4ERR_BADSLOT:
866 		/*
867 		 * The slot id we used was probably retired. Try again
868 		 * using a different slot id.
869 		 */
870 		if (slot->slot_nr < slot->table->target_highest_slotid)
871 			goto session_recover;
872 		goto retry_nowait;
873 	case -NFS4ERR_SEQ_MISORDERED:
874 		nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
875 		/*
876 		 * Were one or more calls using this slot interrupted?
877 		 * If the server never received the request, then our
878 		 * transmitted slot sequence number may be too high. However,
879 		 * if the server did receive the request then it might
880 		 * accidentally give us a reply with a mismatched operation.
881 		 * We can sort this out by sending a lone sequence operation
882 		 * to the server on the same slot.
883 		 */
884 		if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
885 			slot->seq_nr--;
886 			if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
887 				nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
888 				res->sr_slot = NULL;
889 			}
890 			goto retry_nowait;
891 		}
892 		/*
893 		 * RFC5661:
894 		 * A retry might be sent while the original request is
895 		 * still in progress on the replier. The replier SHOULD
896 		 * deal with the issue by returning NFS4ERR_DELAY as the
897 		 * reply to SEQUENCE or CB_SEQUENCE operation, but
898 		 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
899 		 *
900 		 * Restart the search after a delay.
901 		 */
902 		slot->seq_nr = slot->seq_nr_highest_sent;
903 		goto out_retry;
904 	case -NFS4ERR_BADSESSION:
905 	case -NFS4ERR_DEADSESSION:
906 	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
907 		goto session_recover;
908 	default:
909 		/* Just update the slot sequence no. */
910 		slot->seq_done = 1;
911 	}
912 out:
913 	/* The session may be reset by one of the error handlers. */
914 	dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
915 out_noaction:
916 	return ret;
917 session_recover:
918 	nfs4_schedule_session_recovery(session, status);
919 	dprintk("%s ERROR: %d Reset session\n", __func__, status);
920 	nfs41_sequence_free_slot(res);
921 	goto out;
922 retry_new_seq:
923 	++slot->seq_nr;
924 retry_nowait:
925 	if (rpc_restart_call_prepare(task)) {
926 		nfs41_sequence_free_slot(res);
927 		task->tk_status = 0;
928 		ret = 0;
929 	}
930 	goto out;
931 out_retry:
932 	if (!rpc_restart_call(task))
933 		goto out;
934 	rpc_delay(task, NFS4_POLL_RETRY_MAX);
935 	return 0;
936 }
937 
nfs41_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)938 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
939 {
940 	if (!nfs41_sequence_process(task, res))
941 		return 0;
942 	if (res->sr_slot != NULL)
943 		nfs41_sequence_free_slot(res);
944 	return 1;
945 
946 }
947 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
948 
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)949 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
950 {
951 	if (res->sr_slot == NULL)
952 		return 1;
953 	if (res->sr_slot->table->session != NULL)
954 		return nfs41_sequence_process(task, res);
955 	return nfs40_sequence_done(task, res);
956 }
957 
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)958 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
959 {
960 	if (res->sr_slot != NULL) {
961 		if (res->sr_slot->table->session != NULL)
962 			nfs41_sequence_free_slot(res);
963 		else
964 			nfs40_sequence_free_slot(res);
965 	}
966 }
967 
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)968 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
969 {
970 	if (res->sr_slot == NULL)
971 		return 1;
972 	if (!res->sr_slot->table->session)
973 		return nfs40_sequence_done(task, res);
974 	return nfs41_sequence_done(task, res);
975 }
976 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
977 
nfs41_call_sync_prepare(struct rpc_task * task,void * calldata)978 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
979 {
980 	struct nfs4_call_sync_data *data = calldata;
981 
982 	dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
983 
984 	nfs4_setup_sequence(data->seq_server->nfs_client,
985 			    data->seq_args, data->seq_res, task);
986 }
987 
nfs41_call_sync_done(struct rpc_task * task,void * calldata)988 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
989 {
990 	struct nfs4_call_sync_data *data = calldata;
991 
992 	nfs41_sequence_done(task, data->seq_res);
993 }
994 
995 static const struct rpc_call_ops nfs41_call_sync_ops = {
996 	.rpc_call_prepare = nfs41_call_sync_prepare,
997 	.rpc_call_done = nfs41_call_sync_done,
998 };
999 
1000 #else	/* !CONFIG_NFS_V4_1 */
1001 
nfs4_sequence_process(struct rpc_task * task,struct nfs4_sequence_res * res)1002 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1003 {
1004 	return nfs40_sequence_done(task, res);
1005 }
1006 
nfs4_sequence_free_slot(struct nfs4_sequence_res * res)1007 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1008 {
1009 	if (res->sr_slot != NULL)
1010 		nfs40_sequence_free_slot(res);
1011 }
1012 
nfs4_sequence_done(struct rpc_task * task,struct nfs4_sequence_res * res)1013 int nfs4_sequence_done(struct rpc_task *task,
1014 		       struct nfs4_sequence_res *res)
1015 {
1016 	return nfs40_sequence_done(task, res);
1017 }
1018 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1019 
1020 #endif	/* !CONFIG_NFS_V4_1 */
1021 
nfs41_sequence_res_init(struct nfs4_sequence_res * res)1022 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1023 {
1024 	res->sr_timestamp = jiffies;
1025 	res->sr_status_flags = 0;
1026 	res->sr_status = 1;
1027 }
1028 
1029 static
nfs4_sequence_attach_slot(struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct nfs4_slot * slot)1030 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1031 		struct nfs4_sequence_res *res,
1032 		struct nfs4_slot *slot)
1033 {
1034 	if (!slot)
1035 		return;
1036 	slot->privileged = args->sa_privileged ? 1 : 0;
1037 	args->sa_slot = slot;
1038 
1039 	res->sr_slot = slot;
1040 }
1041 
nfs4_setup_sequence(struct nfs_client * client,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,struct rpc_task * task)1042 int nfs4_setup_sequence(struct nfs_client *client,
1043 			struct nfs4_sequence_args *args,
1044 			struct nfs4_sequence_res *res,
1045 			struct rpc_task *task)
1046 {
1047 	struct nfs4_session *session = nfs4_get_session(client);
1048 	struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1049 	struct nfs4_slot *slot;
1050 
1051 	/* slot already allocated? */
1052 	if (res->sr_slot != NULL)
1053 		goto out_start;
1054 
1055 	if (session)
1056 		tbl = &session->fc_slot_table;
1057 
1058 	spin_lock(&tbl->slot_tbl_lock);
1059 	/* The state manager will wait until the slot table is empty */
1060 	if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1061 		goto out_sleep;
1062 
1063 	slot = nfs4_alloc_slot(tbl);
1064 	if (IS_ERR(slot)) {
1065 		if (slot == ERR_PTR(-ENOMEM))
1066 			goto out_sleep_timeout;
1067 		goto out_sleep;
1068 	}
1069 	spin_unlock(&tbl->slot_tbl_lock);
1070 
1071 	nfs4_sequence_attach_slot(args, res, slot);
1072 
1073 	trace_nfs4_setup_sequence(session, args);
1074 out_start:
1075 	nfs41_sequence_res_init(res);
1076 	rpc_call_start(task);
1077 	return 0;
1078 out_sleep_timeout:
1079 	/* Try again in 1/4 second */
1080 	if (args->sa_privileged)
1081 		rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1082 				jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1083 	else
1084 		rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1085 				NULL, jiffies + (HZ >> 2));
1086 	spin_unlock(&tbl->slot_tbl_lock);
1087 	return -EAGAIN;
1088 out_sleep:
1089 	if (args->sa_privileged)
1090 		rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1091 				RPC_PRIORITY_PRIVILEGED);
1092 	else
1093 		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1094 	spin_unlock(&tbl->slot_tbl_lock);
1095 	return -EAGAIN;
1096 }
1097 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1098 
nfs40_call_sync_prepare(struct rpc_task * task,void * calldata)1099 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1100 {
1101 	struct nfs4_call_sync_data *data = calldata;
1102 	nfs4_setup_sequence(data->seq_server->nfs_client,
1103 				data->seq_args, data->seq_res, task);
1104 }
1105 
nfs40_call_sync_done(struct rpc_task * task,void * calldata)1106 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1107 {
1108 	struct nfs4_call_sync_data *data = calldata;
1109 	nfs4_sequence_done(task, data->seq_res);
1110 }
1111 
1112 static const struct rpc_call_ops nfs40_call_sync_ops = {
1113 	.rpc_call_prepare = nfs40_call_sync_prepare,
1114 	.rpc_call_done = nfs40_call_sync_done,
1115 };
1116 
nfs4_call_sync_custom(struct rpc_task_setup * task_setup)1117 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1118 {
1119 	int ret;
1120 	struct rpc_task *task;
1121 
1122 	task = rpc_run_task(task_setup);
1123 	if (IS_ERR(task))
1124 		return PTR_ERR(task);
1125 
1126 	ret = task->tk_status;
1127 	rpc_put_task(task);
1128 	return ret;
1129 }
1130 
nfs4_do_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,unsigned short task_flags)1131 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1132 			     struct nfs_server *server,
1133 			     struct rpc_message *msg,
1134 			     struct nfs4_sequence_args *args,
1135 			     struct nfs4_sequence_res *res,
1136 			     unsigned short task_flags)
1137 {
1138 	struct nfs_client *clp = server->nfs_client;
1139 	struct nfs4_call_sync_data data = {
1140 		.seq_server = server,
1141 		.seq_args = args,
1142 		.seq_res = res,
1143 	};
1144 	struct rpc_task_setup task_setup = {
1145 		.rpc_client = clnt,
1146 		.rpc_message = msg,
1147 		.callback_ops = clp->cl_mvops->call_sync_ops,
1148 		.callback_data = &data,
1149 		.flags = task_flags,
1150 	};
1151 
1152 	return nfs4_call_sync_custom(&task_setup);
1153 }
1154 
nfs4_call_sync_sequence(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res)1155 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1156 				   struct nfs_server *server,
1157 				   struct rpc_message *msg,
1158 				   struct nfs4_sequence_args *args,
1159 				   struct nfs4_sequence_res *res)
1160 {
1161 	unsigned short task_flags = 0;
1162 
1163 	if (server->caps & NFS_CAP_MOVEABLE)
1164 		task_flags = RPC_TASK_MOVEABLE;
1165 	return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1166 }
1167 
1168 
nfs4_call_sync(struct rpc_clnt * clnt,struct nfs_server * server,struct rpc_message * msg,struct nfs4_sequence_args * args,struct nfs4_sequence_res * res,int cache_reply)1169 int nfs4_call_sync(struct rpc_clnt *clnt,
1170 		   struct nfs_server *server,
1171 		   struct rpc_message *msg,
1172 		   struct nfs4_sequence_args *args,
1173 		   struct nfs4_sequence_res *res,
1174 		   int cache_reply)
1175 {
1176 	nfs4_init_sequence(args, res, cache_reply, 0);
1177 	return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1178 }
1179 
1180 static void
nfs4_inc_nlink_locked(struct inode * inode)1181 nfs4_inc_nlink_locked(struct inode *inode)
1182 {
1183 	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1184 					     NFS_INO_INVALID_CTIME |
1185 					     NFS_INO_INVALID_NLINK);
1186 	inc_nlink(inode);
1187 }
1188 
1189 static void
nfs4_inc_nlink(struct inode * inode)1190 nfs4_inc_nlink(struct inode *inode)
1191 {
1192 	spin_lock(&inode->i_lock);
1193 	nfs4_inc_nlink_locked(inode);
1194 	spin_unlock(&inode->i_lock);
1195 }
1196 
1197 static void
nfs4_dec_nlink_locked(struct inode * inode)1198 nfs4_dec_nlink_locked(struct inode *inode)
1199 {
1200 	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1201 					     NFS_INO_INVALID_CTIME |
1202 					     NFS_INO_INVALID_NLINK);
1203 	drop_nlink(inode);
1204 }
1205 
1206 static void
nfs4_update_changeattr_locked(struct inode * inode,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1207 nfs4_update_changeattr_locked(struct inode *inode,
1208 		struct nfs4_change_info *cinfo,
1209 		unsigned long timestamp, unsigned long cache_validity)
1210 {
1211 	struct nfs_inode *nfsi = NFS_I(inode);
1212 	u64 change_attr = inode_peek_iversion_raw(inode);
1213 
1214 	cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1215 	if (S_ISDIR(inode->i_mode))
1216 		cache_validity |= NFS_INO_INVALID_DATA;
1217 
1218 	switch (NFS_SERVER(inode)->change_attr_type) {
1219 	case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1220 		if (cinfo->after == change_attr)
1221 			goto out;
1222 		break;
1223 	default:
1224 		if ((s64)(change_attr - cinfo->after) >= 0)
1225 			goto out;
1226 	}
1227 
1228 	inode_set_iversion_raw(inode, cinfo->after);
1229 	if (!cinfo->atomic || cinfo->before != change_attr) {
1230 		if (S_ISDIR(inode->i_mode))
1231 			nfs_force_lookup_revalidate(inode);
1232 
1233 		if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1234 			cache_validity |=
1235 				NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1236 				NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1237 				NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1238 				NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1239 		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1240 	}
1241 	nfsi->attrtimeo_timestamp = jiffies;
1242 	nfsi->read_cache_jiffies = timestamp;
1243 	nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1244 	nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1245 out:
1246 	nfs_set_cache_invalid(inode, cache_validity);
1247 }
1248 
1249 void
nfs4_update_changeattr(struct inode * dir,struct nfs4_change_info * cinfo,unsigned long timestamp,unsigned long cache_validity)1250 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1251 		unsigned long timestamp, unsigned long cache_validity)
1252 {
1253 	spin_lock(&dir->i_lock);
1254 	nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1255 	spin_unlock(&dir->i_lock);
1256 }
1257 
1258 struct nfs4_open_createattrs {
1259 	struct nfs4_label *label;
1260 	struct iattr *sattr;
1261 	const __u32 verf[2];
1262 };
1263 
nfs4_clear_cap_atomic_open_v1(struct nfs_server * server,int err,struct nfs4_exception * exception)1264 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1265 		int err, struct nfs4_exception *exception)
1266 {
1267 	if (err != -EINVAL)
1268 		return false;
1269 	if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1270 		return false;
1271 	server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1272 	exception->retry = 1;
1273 	return true;
1274 }
1275 
_nfs4_ctx_to_accessmode(const struct nfs_open_context * ctx)1276 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1277 {
1278 	 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1279 }
1280 
_nfs4_ctx_to_openmode(const struct nfs_open_context * ctx)1281 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1282 {
1283 	fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1284 
1285 	return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1286 }
1287 
1288 static u32
nfs4_map_atomic_open_share(struct nfs_server * server,fmode_t fmode,int openflags)1289 nfs4_map_atomic_open_share(struct nfs_server *server,
1290 		fmode_t fmode, int openflags)
1291 {
1292 	u32 res = 0;
1293 
1294 	switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1295 	case FMODE_READ:
1296 		res = NFS4_SHARE_ACCESS_READ;
1297 		break;
1298 	case FMODE_WRITE:
1299 		res = NFS4_SHARE_ACCESS_WRITE;
1300 		break;
1301 	case FMODE_READ|FMODE_WRITE:
1302 		res = NFS4_SHARE_ACCESS_BOTH;
1303 	}
1304 	if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1305 		goto out;
1306 	/* Want no delegation if we're using O_DIRECT */
1307 	if (openflags & O_DIRECT)
1308 		res |= NFS4_SHARE_WANT_NO_DELEG;
1309 out:
1310 	return res;
1311 }
1312 
1313 static enum open_claim_type4
nfs4_map_atomic_open_claim(struct nfs_server * server,enum open_claim_type4 claim)1314 nfs4_map_atomic_open_claim(struct nfs_server *server,
1315 		enum open_claim_type4 claim)
1316 {
1317 	if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1318 		return claim;
1319 	switch (claim) {
1320 	default:
1321 		return claim;
1322 	case NFS4_OPEN_CLAIM_FH:
1323 		return NFS4_OPEN_CLAIM_NULL;
1324 	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1325 		return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1326 	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1327 		return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1328 	}
1329 }
1330 
nfs4_init_opendata_res(struct nfs4_opendata * p)1331 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1332 {
1333 	p->o_res.f_attr = &p->f_attr;
1334 	p->o_res.seqid = p->o_arg.seqid;
1335 	p->c_res.seqid = p->c_arg.seqid;
1336 	p->o_res.server = p->o_arg.server;
1337 	p->o_res.access_request = p->o_arg.access;
1338 	nfs_fattr_init(&p->f_attr);
1339 	nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1340 }
1341 
nfs4_opendata_alloc(struct dentry * dentry,struct nfs4_state_owner * sp,fmode_t fmode,int flags,const struct nfs4_open_createattrs * c,enum open_claim_type4 claim,gfp_t gfp_mask)1342 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1343 		struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1344 		const struct nfs4_open_createattrs *c,
1345 		enum open_claim_type4 claim,
1346 		gfp_t gfp_mask)
1347 {
1348 	struct dentry *parent = dget_parent(dentry);
1349 	struct inode *dir = d_inode(parent);
1350 	struct nfs_server *server = NFS_SERVER(dir);
1351 	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1352 	struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1353 	struct nfs4_opendata *p;
1354 
1355 	p = kzalloc(sizeof(*p), gfp_mask);
1356 	if (p == NULL)
1357 		goto err;
1358 
1359 	p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1360 	if (IS_ERR(p->f_attr.label))
1361 		goto err_free_p;
1362 
1363 	p->a_label = nfs4_label_alloc(server, gfp_mask);
1364 	if (IS_ERR(p->a_label))
1365 		goto err_free_f;
1366 
1367 	alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1368 	p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1369 	if (IS_ERR(p->o_arg.seqid))
1370 		goto err_free_label;
1371 	nfs_sb_active(dentry->d_sb);
1372 	p->dentry = dget(dentry);
1373 	p->dir = parent;
1374 	p->owner = sp;
1375 	atomic_inc(&sp->so_count);
1376 	p->o_arg.open_flags = flags;
1377 	p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1378 	p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1379 	p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1380 			fmode, flags);
1381 	if (flags & O_CREAT) {
1382 		p->o_arg.umask = current_umask();
1383 		p->o_arg.label = nfs4_label_copy(p->a_label, label);
1384 		if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1385 			p->o_arg.u.attrs = &p->attrs;
1386 			memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1387 
1388 			memcpy(p->o_arg.u.verifier.data, c->verf,
1389 					sizeof(p->o_arg.u.verifier.data));
1390 		}
1391 	}
1392 	/* ask server to check for all possible rights as results
1393 	 * are cached */
1394 	switch (p->o_arg.claim) {
1395 	default:
1396 		break;
1397 	case NFS4_OPEN_CLAIM_NULL:
1398 	case NFS4_OPEN_CLAIM_FH:
1399 		p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1400 				  NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1401 				  NFS4_ACCESS_EXECUTE |
1402 				  nfs_access_xattr_mask(server);
1403 	}
1404 	p->o_arg.clientid = server->nfs_client->cl_clientid;
1405 	p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1406 	p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1407 	p->o_arg.name = &dentry->d_name;
1408 	p->o_arg.server = server;
1409 	p->o_arg.bitmask = nfs4_bitmask(server, label);
1410 	p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1411 	switch (p->o_arg.claim) {
1412 	case NFS4_OPEN_CLAIM_NULL:
1413 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1414 	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1415 		p->o_arg.fh = NFS_FH(dir);
1416 		break;
1417 	case NFS4_OPEN_CLAIM_PREVIOUS:
1418 	case NFS4_OPEN_CLAIM_FH:
1419 	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1420 	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1421 		p->o_arg.fh = NFS_FH(d_inode(dentry));
1422 	}
1423 	p->c_arg.fh = &p->o_res.fh;
1424 	p->c_arg.stateid = &p->o_res.stateid;
1425 	p->c_arg.seqid = p->o_arg.seqid;
1426 	nfs4_init_opendata_res(p);
1427 	kref_init(&p->kref);
1428 	return p;
1429 
1430 err_free_label:
1431 	nfs4_label_free(p->a_label);
1432 err_free_f:
1433 	nfs4_label_free(p->f_attr.label);
1434 err_free_p:
1435 	kfree(p);
1436 err:
1437 	dput(parent);
1438 	return NULL;
1439 }
1440 
nfs4_opendata_free(struct kref * kref)1441 static void nfs4_opendata_free(struct kref *kref)
1442 {
1443 	struct nfs4_opendata *p = container_of(kref,
1444 			struct nfs4_opendata, kref);
1445 	struct super_block *sb = p->dentry->d_sb;
1446 
1447 	nfs4_lgopen_release(p->lgp);
1448 	nfs_free_seqid(p->o_arg.seqid);
1449 	nfs4_sequence_free_slot(&p->o_res.seq_res);
1450 	if (p->state != NULL)
1451 		nfs4_put_open_state(p->state);
1452 	nfs4_put_state_owner(p->owner);
1453 
1454 	nfs4_label_free(p->a_label);
1455 	nfs4_label_free(p->f_attr.label);
1456 
1457 	dput(p->dir);
1458 	dput(p->dentry);
1459 	nfs_sb_deactive(sb);
1460 	nfs_fattr_free_names(&p->f_attr);
1461 	kfree(p->f_attr.mdsthreshold);
1462 	kfree(p);
1463 }
1464 
nfs4_opendata_put(struct nfs4_opendata * p)1465 static void nfs4_opendata_put(struct nfs4_opendata *p)
1466 {
1467 	if (p != NULL)
1468 		kref_put(&p->kref, nfs4_opendata_free);
1469 }
1470 
nfs4_mode_match_open_stateid(struct nfs4_state * state,fmode_t fmode)1471 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1472 		fmode_t fmode)
1473 {
1474 	switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1475 	case FMODE_READ|FMODE_WRITE:
1476 		return state->n_rdwr != 0;
1477 	case FMODE_WRITE:
1478 		return state->n_wronly != 0;
1479 	case FMODE_READ:
1480 		return state->n_rdonly != 0;
1481 	}
1482 	WARN_ON_ONCE(1);
1483 	return false;
1484 }
1485 
can_open_cached(struct nfs4_state * state,fmode_t mode,int open_mode,enum open_claim_type4 claim)1486 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1487 		int open_mode, enum open_claim_type4 claim)
1488 {
1489 	int ret = 0;
1490 
1491 	if (open_mode & (O_EXCL|O_TRUNC))
1492 		goto out;
1493 	switch (claim) {
1494 	case NFS4_OPEN_CLAIM_NULL:
1495 	case NFS4_OPEN_CLAIM_FH:
1496 		goto out;
1497 	default:
1498 		break;
1499 	}
1500 	switch (mode & (FMODE_READ|FMODE_WRITE)) {
1501 		case FMODE_READ:
1502 			ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1503 				&& state->n_rdonly != 0;
1504 			break;
1505 		case FMODE_WRITE:
1506 			ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1507 				&& state->n_wronly != 0;
1508 			break;
1509 		case FMODE_READ|FMODE_WRITE:
1510 			ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1511 				&& state->n_rdwr != 0;
1512 	}
1513 out:
1514 	return ret;
1515 }
1516 
can_open_delegated(struct nfs_delegation * delegation,fmode_t fmode,enum open_claim_type4 claim)1517 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1518 		enum open_claim_type4 claim)
1519 {
1520 	if (delegation == NULL)
1521 		return 0;
1522 	if ((delegation->type & fmode) != fmode)
1523 		return 0;
1524 	switch (claim) {
1525 	case NFS4_OPEN_CLAIM_NULL:
1526 	case NFS4_OPEN_CLAIM_FH:
1527 		break;
1528 	case NFS4_OPEN_CLAIM_PREVIOUS:
1529 		if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1530 			break;
1531 		fallthrough;
1532 	default:
1533 		return 0;
1534 	}
1535 	nfs_mark_delegation_referenced(delegation);
1536 	return 1;
1537 }
1538 
update_open_stateflags(struct nfs4_state * state,fmode_t fmode)1539 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1540 {
1541 	switch (fmode) {
1542 		case FMODE_WRITE:
1543 			state->n_wronly++;
1544 			break;
1545 		case FMODE_READ:
1546 			state->n_rdonly++;
1547 			break;
1548 		case FMODE_READ|FMODE_WRITE:
1549 			state->n_rdwr++;
1550 	}
1551 	nfs4_state_set_mode_locked(state, state->state | fmode);
1552 }
1553 
1554 #ifdef CONFIG_NFS_V4_1
nfs_open_stateid_recover_openmode(struct nfs4_state * state)1555 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1556 {
1557 	if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1558 		return true;
1559 	if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1560 		return true;
1561 	if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1562 		return true;
1563 	return false;
1564 }
1565 #endif /* CONFIG_NFS_V4_1 */
1566 
nfs_state_log_update_open_stateid(struct nfs4_state * state)1567 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1568 {
1569 	if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1570 		wake_up_all(&state->waitq);
1571 }
1572 
nfs_test_and_clear_all_open_stateid(struct nfs4_state * state)1573 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1574 {
1575 	struct nfs_client *clp = state->owner->so_server->nfs_client;
1576 	bool need_recover = false;
1577 
1578 	if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1579 		need_recover = true;
1580 	if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1581 		need_recover = true;
1582 	if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1583 		need_recover = true;
1584 	if (need_recover)
1585 		nfs4_state_mark_reclaim_nograce(clp, state);
1586 }
1587 
1588 /*
1589  * Check for whether or not the caller may update the open stateid
1590  * to the value passed in by stateid.
1591  *
1592  * Note: This function relies heavily on the server implementing
1593  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1594  * correctly.
1595  * i.e. The stateid seqids have to be initialised to 1, and
1596  * are then incremented on every state transition.
1597  */
nfs_stateid_is_sequential(struct nfs4_state * state,const nfs4_stateid * stateid)1598 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1599 		const nfs4_stateid *stateid)
1600 {
1601 	if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1602 		/* The common case - we're updating to a new sequence number */
1603 		if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1604 			if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1605 				return true;
1606 			return false;
1607 		}
1608 		/* The server returned a new stateid */
1609 	}
1610 	/* This is the first OPEN in this generation */
1611 	if (stateid->seqid == cpu_to_be32(1))
1612 		return true;
1613 	return false;
1614 }
1615 
nfs_resync_open_stateid_locked(struct nfs4_state * state)1616 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1617 {
1618 	if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1619 		return;
1620 	if (state->n_wronly)
1621 		set_bit(NFS_O_WRONLY_STATE, &state->flags);
1622 	if (state->n_rdonly)
1623 		set_bit(NFS_O_RDONLY_STATE, &state->flags);
1624 	if (state->n_rdwr)
1625 		set_bit(NFS_O_RDWR_STATE, &state->flags);
1626 	set_bit(NFS_OPEN_STATE, &state->flags);
1627 }
1628 
nfs_clear_open_stateid_locked(struct nfs4_state * state,nfs4_stateid * stateid,fmode_t fmode)1629 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1630 		nfs4_stateid *stateid, fmode_t fmode)
1631 {
1632 	clear_bit(NFS_O_RDWR_STATE, &state->flags);
1633 	switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1634 	case FMODE_WRITE:
1635 		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1636 		break;
1637 	case FMODE_READ:
1638 		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1639 		break;
1640 	case 0:
1641 		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1642 		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1643 		clear_bit(NFS_OPEN_STATE, &state->flags);
1644 	}
1645 	if (stateid == NULL)
1646 		return;
1647 	/* Handle OPEN+OPEN_DOWNGRADE races */
1648 	if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1649 	    !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1650 		nfs_resync_open_stateid_locked(state);
1651 		goto out;
1652 	}
1653 	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1654 		nfs4_stateid_copy(&state->stateid, stateid);
1655 	nfs4_stateid_copy(&state->open_stateid, stateid);
1656 	trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1657 out:
1658 	nfs_state_log_update_open_stateid(state);
1659 }
1660 
nfs_clear_open_stateid(struct nfs4_state * state,nfs4_stateid * arg_stateid,nfs4_stateid * stateid,fmode_t fmode)1661 static void nfs_clear_open_stateid(struct nfs4_state *state,
1662 	nfs4_stateid *arg_stateid,
1663 	nfs4_stateid *stateid, fmode_t fmode)
1664 {
1665 	write_seqlock(&state->seqlock);
1666 	/* Ignore, if the CLOSE argment doesn't match the current stateid */
1667 	if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1668 		nfs_clear_open_stateid_locked(state, stateid, fmode);
1669 	write_sequnlock(&state->seqlock);
1670 	if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1671 		nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1672 }
1673 
nfs_set_open_stateid_locked(struct nfs4_state * state,const nfs4_stateid * stateid,nfs4_stateid * freeme)1674 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1675 		const nfs4_stateid *stateid, nfs4_stateid *freeme)
1676 	__must_hold(&state->owner->so_lock)
1677 	__must_hold(&state->seqlock)
1678 	__must_hold(RCU)
1679 
1680 {
1681 	DEFINE_WAIT(wait);
1682 	int status = 0;
1683 	for (;;) {
1684 
1685 		if (nfs_stateid_is_sequential(state, stateid))
1686 			break;
1687 
1688 		if (status)
1689 			break;
1690 		/* Rely on seqids for serialisation with NFSv4.0 */
1691 		if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1692 			break;
1693 
1694 		set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1695 		prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1696 		/*
1697 		 * Ensure we process the state changes in the same order
1698 		 * in which the server processed them by delaying the
1699 		 * update of the stateid until we are in sequence.
1700 		 */
1701 		write_sequnlock(&state->seqlock);
1702 		spin_unlock(&state->owner->so_lock);
1703 		rcu_read_unlock();
1704 		trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1705 
1706 		if (!fatal_signal_pending(current)) {
1707 			if (schedule_timeout(5*HZ) == 0)
1708 				status = -EAGAIN;
1709 			else
1710 				status = 0;
1711 		} else
1712 			status = -EINTR;
1713 		finish_wait(&state->waitq, &wait);
1714 		rcu_read_lock();
1715 		spin_lock(&state->owner->so_lock);
1716 		write_seqlock(&state->seqlock);
1717 	}
1718 
1719 	if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1720 	    !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1721 		nfs4_stateid_copy(freeme, &state->open_stateid);
1722 		nfs_test_and_clear_all_open_stateid(state);
1723 	}
1724 
1725 	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1726 		nfs4_stateid_copy(&state->stateid, stateid);
1727 	nfs4_stateid_copy(&state->open_stateid, stateid);
1728 	trace_nfs4_open_stateid_update(state->inode, stateid, status);
1729 	nfs_state_log_update_open_stateid(state);
1730 }
1731 
nfs_state_set_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,fmode_t fmode,nfs4_stateid * freeme)1732 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1733 		const nfs4_stateid *open_stateid,
1734 		fmode_t fmode,
1735 		nfs4_stateid *freeme)
1736 {
1737 	/*
1738 	 * Protect the call to nfs4_state_set_mode_locked and
1739 	 * serialise the stateid update
1740 	 */
1741 	write_seqlock(&state->seqlock);
1742 	nfs_set_open_stateid_locked(state, open_stateid, freeme);
1743 	switch (fmode) {
1744 	case FMODE_READ:
1745 		set_bit(NFS_O_RDONLY_STATE, &state->flags);
1746 		break;
1747 	case FMODE_WRITE:
1748 		set_bit(NFS_O_WRONLY_STATE, &state->flags);
1749 		break;
1750 	case FMODE_READ|FMODE_WRITE:
1751 		set_bit(NFS_O_RDWR_STATE, &state->flags);
1752 	}
1753 	set_bit(NFS_OPEN_STATE, &state->flags);
1754 	write_sequnlock(&state->seqlock);
1755 }
1756 
nfs_state_clear_open_state_flags(struct nfs4_state * state)1757 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1758 {
1759 	clear_bit(NFS_O_RDWR_STATE, &state->flags);
1760 	clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1761 	clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1762 	clear_bit(NFS_OPEN_STATE, &state->flags);
1763 }
1764 
nfs_state_set_delegation(struct nfs4_state * state,const nfs4_stateid * deleg_stateid,fmode_t fmode)1765 static void nfs_state_set_delegation(struct nfs4_state *state,
1766 		const nfs4_stateid *deleg_stateid,
1767 		fmode_t fmode)
1768 {
1769 	/*
1770 	 * Protect the call to nfs4_state_set_mode_locked and
1771 	 * serialise the stateid update
1772 	 */
1773 	write_seqlock(&state->seqlock);
1774 	nfs4_stateid_copy(&state->stateid, deleg_stateid);
1775 	set_bit(NFS_DELEGATED_STATE, &state->flags);
1776 	write_sequnlock(&state->seqlock);
1777 }
1778 
nfs_state_clear_delegation(struct nfs4_state * state)1779 static void nfs_state_clear_delegation(struct nfs4_state *state)
1780 {
1781 	write_seqlock(&state->seqlock);
1782 	nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1783 	clear_bit(NFS_DELEGATED_STATE, &state->flags);
1784 	write_sequnlock(&state->seqlock);
1785 }
1786 
update_open_stateid(struct nfs4_state * state,const nfs4_stateid * open_stateid,const nfs4_stateid * delegation,fmode_t fmode)1787 int update_open_stateid(struct nfs4_state *state,
1788 		const nfs4_stateid *open_stateid,
1789 		const nfs4_stateid *delegation,
1790 		fmode_t fmode)
1791 {
1792 	struct nfs_server *server = NFS_SERVER(state->inode);
1793 	struct nfs_client *clp = server->nfs_client;
1794 	struct nfs_inode *nfsi = NFS_I(state->inode);
1795 	struct nfs_delegation *deleg_cur;
1796 	nfs4_stateid freeme = { };
1797 	int ret = 0;
1798 
1799 	fmode &= (FMODE_READ|FMODE_WRITE);
1800 
1801 	rcu_read_lock();
1802 	spin_lock(&state->owner->so_lock);
1803 	if (open_stateid != NULL) {
1804 		nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1805 		ret = 1;
1806 	}
1807 
1808 	deleg_cur = nfs4_get_valid_delegation(state->inode);
1809 	if (deleg_cur == NULL)
1810 		goto no_delegation;
1811 
1812 	spin_lock(&deleg_cur->lock);
1813 	if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1814 	   test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1815 	    (deleg_cur->type & fmode) != fmode)
1816 		goto no_delegation_unlock;
1817 
1818 	if (delegation == NULL)
1819 		delegation = &deleg_cur->stateid;
1820 	else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1821 		goto no_delegation_unlock;
1822 
1823 	nfs_mark_delegation_referenced(deleg_cur);
1824 	nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1825 	ret = 1;
1826 no_delegation_unlock:
1827 	spin_unlock(&deleg_cur->lock);
1828 no_delegation:
1829 	if (ret)
1830 		update_open_stateflags(state, fmode);
1831 	spin_unlock(&state->owner->so_lock);
1832 	rcu_read_unlock();
1833 
1834 	if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1835 		nfs4_schedule_state_manager(clp);
1836 	if (freeme.type != 0)
1837 		nfs4_test_and_free_stateid(server, &freeme,
1838 				state->owner->so_cred);
1839 
1840 	return ret;
1841 }
1842 
nfs4_update_lock_stateid(struct nfs4_lock_state * lsp,const nfs4_stateid * stateid)1843 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1844 		const nfs4_stateid *stateid)
1845 {
1846 	struct nfs4_state *state = lsp->ls_state;
1847 	bool ret = false;
1848 
1849 	spin_lock(&state->state_lock);
1850 	if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1851 		goto out_noupdate;
1852 	if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1853 		goto out_noupdate;
1854 	nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1855 	ret = true;
1856 out_noupdate:
1857 	spin_unlock(&state->state_lock);
1858 	return ret;
1859 }
1860 
nfs4_return_incompatible_delegation(struct inode * inode,fmode_t fmode)1861 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1862 {
1863 	struct nfs_delegation *delegation;
1864 
1865 	fmode &= FMODE_READ|FMODE_WRITE;
1866 	rcu_read_lock();
1867 	delegation = nfs4_get_valid_delegation(inode);
1868 	if (delegation == NULL || (delegation->type & fmode) == fmode) {
1869 		rcu_read_unlock();
1870 		return;
1871 	}
1872 	rcu_read_unlock();
1873 	nfs4_inode_return_delegation(inode);
1874 }
1875 
nfs4_try_open_cached(struct nfs4_opendata * opendata)1876 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1877 {
1878 	struct nfs4_state *state = opendata->state;
1879 	struct nfs_delegation *delegation;
1880 	int open_mode = opendata->o_arg.open_flags;
1881 	fmode_t fmode = opendata->o_arg.fmode;
1882 	enum open_claim_type4 claim = opendata->o_arg.claim;
1883 	nfs4_stateid stateid;
1884 	int ret = -EAGAIN;
1885 
1886 	for (;;) {
1887 		spin_lock(&state->owner->so_lock);
1888 		if (can_open_cached(state, fmode, open_mode, claim)) {
1889 			update_open_stateflags(state, fmode);
1890 			spin_unlock(&state->owner->so_lock);
1891 			goto out_return_state;
1892 		}
1893 		spin_unlock(&state->owner->so_lock);
1894 		rcu_read_lock();
1895 		delegation = nfs4_get_valid_delegation(state->inode);
1896 		if (!can_open_delegated(delegation, fmode, claim)) {
1897 			rcu_read_unlock();
1898 			break;
1899 		}
1900 		/* Save the delegation */
1901 		nfs4_stateid_copy(&stateid, &delegation->stateid);
1902 		rcu_read_unlock();
1903 		nfs_release_seqid(opendata->o_arg.seqid);
1904 		if (!opendata->is_recover) {
1905 			ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1906 			if (ret != 0)
1907 				goto out;
1908 		}
1909 		ret = -EAGAIN;
1910 
1911 		/* Try to update the stateid using the delegation */
1912 		if (update_open_stateid(state, NULL, &stateid, fmode))
1913 			goto out_return_state;
1914 	}
1915 out:
1916 	return ERR_PTR(ret);
1917 out_return_state:
1918 	refcount_inc(&state->count);
1919 	return state;
1920 }
1921 
1922 static void
nfs4_opendata_check_deleg(struct nfs4_opendata * data,struct nfs4_state * state)1923 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1924 {
1925 	struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1926 	struct nfs_delegation *delegation;
1927 	int delegation_flags = 0;
1928 
1929 	rcu_read_lock();
1930 	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1931 	if (delegation)
1932 		delegation_flags = delegation->flags;
1933 	rcu_read_unlock();
1934 	switch (data->o_arg.claim) {
1935 	default:
1936 		break;
1937 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1938 	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1939 		pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1940 				   "returning a delegation for "
1941 				   "OPEN(CLAIM_DELEGATE_CUR)\n",
1942 				   clp->cl_hostname);
1943 		return;
1944 	}
1945 	if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1946 		nfs_inode_set_delegation(state->inode,
1947 				data->owner->so_cred,
1948 				data->o_res.delegation_type,
1949 				&data->o_res.delegation,
1950 				data->o_res.pagemod_limit);
1951 	else
1952 		nfs_inode_reclaim_delegation(state->inode,
1953 				data->owner->so_cred,
1954 				data->o_res.delegation_type,
1955 				&data->o_res.delegation,
1956 				data->o_res.pagemod_limit);
1957 
1958 	if (data->o_res.do_recall)
1959 		nfs_async_inode_return_delegation(state->inode,
1960 						  &data->o_res.delegation);
1961 }
1962 
1963 /*
1964  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1965  * and update the nfs4_state.
1966  */
1967 static struct nfs4_state *
_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata * data)1968 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1969 {
1970 	struct inode *inode = data->state->inode;
1971 	struct nfs4_state *state = data->state;
1972 	int ret;
1973 
1974 	if (!data->rpc_done) {
1975 		if (data->rpc_status)
1976 			return ERR_PTR(data->rpc_status);
1977 		/* cached opens have already been processed */
1978 		goto update;
1979 	}
1980 
1981 	ret = nfs_refresh_inode(inode, &data->f_attr);
1982 	if (ret)
1983 		return ERR_PTR(ret);
1984 
1985 	if (data->o_res.delegation_type != 0)
1986 		nfs4_opendata_check_deleg(data, state);
1987 update:
1988 	if (!update_open_stateid(state, &data->o_res.stateid,
1989 				NULL, data->o_arg.fmode))
1990 		return ERR_PTR(-EAGAIN);
1991 	refcount_inc(&state->count);
1992 
1993 	return state;
1994 }
1995 
1996 static struct inode *
nfs4_opendata_get_inode(struct nfs4_opendata * data)1997 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1998 {
1999 	struct inode *inode;
2000 
2001 	switch (data->o_arg.claim) {
2002 	case NFS4_OPEN_CLAIM_NULL:
2003 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2004 	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2005 		if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2006 			return ERR_PTR(-EAGAIN);
2007 		inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2008 				&data->f_attr);
2009 		break;
2010 	default:
2011 		inode = d_inode(data->dentry);
2012 		ihold(inode);
2013 		nfs_refresh_inode(inode, &data->f_attr);
2014 	}
2015 	return inode;
2016 }
2017 
2018 static struct nfs4_state *
nfs4_opendata_find_nfs4_state(struct nfs4_opendata * data)2019 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2020 {
2021 	struct nfs4_state *state;
2022 	struct inode *inode;
2023 
2024 	inode = nfs4_opendata_get_inode(data);
2025 	if (IS_ERR(inode))
2026 		return ERR_CAST(inode);
2027 	if (data->state != NULL && data->state->inode == inode) {
2028 		state = data->state;
2029 		refcount_inc(&state->count);
2030 	} else
2031 		state = nfs4_get_open_state(inode, data->owner);
2032 	iput(inode);
2033 	if (state == NULL)
2034 		state = ERR_PTR(-ENOMEM);
2035 	return state;
2036 }
2037 
2038 static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2039 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2040 {
2041 	struct nfs4_state *state;
2042 
2043 	if (!data->rpc_done) {
2044 		state = nfs4_try_open_cached(data);
2045 		trace_nfs4_cached_open(data->state);
2046 		goto out;
2047 	}
2048 
2049 	state = nfs4_opendata_find_nfs4_state(data);
2050 	if (IS_ERR(state))
2051 		goto out;
2052 
2053 	if (data->o_res.delegation_type != 0)
2054 		nfs4_opendata_check_deleg(data, state);
2055 	if (!update_open_stateid(state, &data->o_res.stateid,
2056 				NULL, data->o_arg.fmode)) {
2057 		nfs4_put_open_state(state);
2058 		state = ERR_PTR(-EAGAIN);
2059 	}
2060 out:
2061 	nfs_release_seqid(data->o_arg.seqid);
2062 	return state;
2063 }
2064 
2065 static struct nfs4_state *
nfs4_opendata_to_nfs4_state(struct nfs4_opendata * data)2066 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2067 {
2068 	struct nfs4_state *ret;
2069 
2070 	if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2071 		ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2072 	else
2073 		ret = _nfs4_opendata_to_nfs4_state(data);
2074 	nfs4_sequence_free_slot(&data->o_res.seq_res);
2075 	return ret;
2076 }
2077 
2078 static struct nfs_open_context *
nfs4_state_find_open_context_mode(struct nfs4_state * state,fmode_t mode)2079 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2080 {
2081 	struct nfs_inode *nfsi = NFS_I(state->inode);
2082 	struct nfs_open_context *ctx;
2083 
2084 	rcu_read_lock();
2085 	list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2086 		if (ctx->state != state)
2087 			continue;
2088 		if ((ctx->mode & mode) != mode)
2089 			continue;
2090 		if (!get_nfs_open_context(ctx))
2091 			continue;
2092 		rcu_read_unlock();
2093 		return ctx;
2094 	}
2095 	rcu_read_unlock();
2096 	return ERR_PTR(-ENOENT);
2097 }
2098 
2099 static struct nfs_open_context *
nfs4_state_find_open_context(struct nfs4_state * state)2100 nfs4_state_find_open_context(struct nfs4_state *state)
2101 {
2102 	struct nfs_open_context *ctx;
2103 
2104 	ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2105 	if (!IS_ERR(ctx))
2106 		return ctx;
2107 	ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2108 	if (!IS_ERR(ctx))
2109 		return ctx;
2110 	return nfs4_state_find_open_context_mode(state, FMODE_READ);
2111 }
2112 
nfs4_open_recoverdata_alloc(struct nfs_open_context * ctx,struct nfs4_state * state,enum open_claim_type4 claim)2113 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2114 		struct nfs4_state *state, enum open_claim_type4 claim)
2115 {
2116 	struct nfs4_opendata *opendata;
2117 
2118 	opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2119 			NULL, claim, GFP_NOFS);
2120 	if (opendata == NULL)
2121 		return ERR_PTR(-ENOMEM);
2122 	opendata->state = state;
2123 	refcount_inc(&state->count);
2124 	return opendata;
2125 }
2126 
nfs4_open_recover_helper(struct nfs4_opendata * opendata,fmode_t fmode)2127 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2128 		fmode_t fmode)
2129 {
2130 	struct nfs4_state *newstate;
2131 	int ret;
2132 
2133 	if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2134 		return 0;
2135 	opendata->o_arg.open_flags = 0;
2136 	opendata->o_arg.fmode = fmode;
2137 	opendata->o_arg.share_access = nfs4_map_atomic_open_share(
2138 			NFS_SB(opendata->dentry->d_sb),
2139 			fmode, 0);
2140 	memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2141 	memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2142 	nfs4_init_opendata_res(opendata);
2143 	ret = _nfs4_recover_proc_open(opendata);
2144 	if (ret != 0)
2145 		return ret;
2146 	newstate = nfs4_opendata_to_nfs4_state(opendata);
2147 	if (IS_ERR(newstate))
2148 		return PTR_ERR(newstate);
2149 	if (newstate != opendata->state)
2150 		ret = -ESTALE;
2151 	nfs4_close_state(newstate, fmode);
2152 	return ret;
2153 }
2154 
nfs4_open_recover(struct nfs4_opendata * opendata,struct nfs4_state * state)2155 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2156 {
2157 	int ret;
2158 
2159 	/* memory barrier prior to reading state->n_* */
2160 	smp_rmb();
2161 	ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2162 	if (ret != 0)
2163 		return ret;
2164 	ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2165 	if (ret != 0)
2166 		return ret;
2167 	ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2168 	if (ret != 0)
2169 		return ret;
2170 	/*
2171 	 * We may have performed cached opens for all three recoveries.
2172 	 * Check if we need to update the current stateid.
2173 	 */
2174 	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2175 	    !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2176 		write_seqlock(&state->seqlock);
2177 		if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2178 			nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2179 		write_sequnlock(&state->seqlock);
2180 	}
2181 	return 0;
2182 }
2183 
2184 /*
2185  * OPEN_RECLAIM:
2186  * 	reclaim state on the server after a reboot.
2187  */
_nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2188 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2189 {
2190 	struct nfs_delegation *delegation;
2191 	struct nfs4_opendata *opendata;
2192 	fmode_t delegation_type = 0;
2193 	int status;
2194 
2195 	opendata = nfs4_open_recoverdata_alloc(ctx, state,
2196 			NFS4_OPEN_CLAIM_PREVIOUS);
2197 	if (IS_ERR(opendata))
2198 		return PTR_ERR(opendata);
2199 	rcu_read_lock();
2200 	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2201 	if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2202 		delegation_type = delegation->type;
2203 	rcu_read_unlock();
2204 	opendata->o_arg.u.delegation_type = delegation_type;
2205 	status = nfs4_open_recover(opendata, state);
2206 	nfs4_opendata_put(opendata);
2207 	return status;
2208 }
2209 
nfs4_do_open_reclaim(struct nfs_open_context * ctx,struct nfs4_state * state)2210 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2211 {
2212 	struct nfs_server *server = NFS_SERVER(state->inode);
2213 	struct nfs4_exception exception = { };
2214 	int err;
2215 	do {
2216 		err = _nfs4_do_open_reclaim(ctx, state);
2217 		trace_nfs4_open_reclaim(ctx, 0, err);
2218 		if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2219 			continue;
2220 		if (err != -NFS4ERR_DELAY)
2221 			break;
2222 		nfs4_handle_exception(server, err, &exception);
2223 	} while (exception.retry);
2224 	return err;
2225 }
2226 
nfs4_open_reclaim(struct nfs4_state_owner * sp,struct nfs4_state * state)2227 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2228 {
2229 	struct nfs_open_context *ctx;
2230 	int ret;
2231 
2232 	ctx = nfs4_state_find_open_context(state);
2233 	if (IS_ERR(ctx))
2234 		return -EAGAIN;
2235 	clear_bit(NFS_DELEGATED_STATE, &state->flags);
2236 	nfs_state_clear_open_state_flags(state);
2237 	ret = nfs4_do_open_reclaim(ctx, state);
2238 	put_nfs_open_context(ctx);
2239 	return ret;
2240 }
2241 
nfs4_handle_delegation_recall_error(struct nfs_server * server,struct nfs4_state * state,const nfs4_stateid * stateid,struct file_lock * fl,int err)2242 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2243 {
2244 	switch (err) {
2245 		default:
2246 			printk(KERN_ERR "NFS: %s: unhandled error "
2247 					"%d.\n", __func__, err);
2248 			fallthrough;
2249 		case 0:
2250 		case -ENOENT:
2251 		case -EAGAIN:
2252 		case -ESTALE:
2253 		case -ETIMEDOUT:
2254 			break;
2255 		case -NFS4ERR_BADSESSION:
2256 		case -NFS4ERR_BADSLOT:
2257 		case -NFS4ERR_BAD_HIGH_SLOT:
2258 		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2259 		case -NFS4ERR_DEADSESSION:
2260 			return -EAGAIN;
2261 		case -NFS4ERR_STALE_CLIENTID:
2262 		case -NFS4ERR_STALE_STATEID:
2263 			/* Don't recall a delegation if it was lost */
2264 			nfs4_schedule_lease_recovery(server->nfs_client);
2265 			return -EAGAIN;
2266 		case -NFS4ERR_MOVED:
2267 			nfs4_schedule_migration_recovery(server);
2268 			return -EAGAIN;
2269 		case -NFS4ERR_LEASE_MOVED:
2270 			nfs4_schedule_lease_moved_recovery(server->nfs_client);
2271 			return -EAGAIN;
2272 		case -NFS4ERR_DELEG_REVOKED:
2273 		case -NFS4ERR_ADMIN_REVOKED:
2274 		case -NFS4ERR_EXPIRED:
2275 		case -NFS4ERR_BAD_STATEID:
2276 		case -NFS4ERR_OPENMODE:
2277 			nfs_inode_find_state_and_recover(state->inode,
2278 					stateid);
2279 			nfs4_schedule_stateid_recovery(server, state);
2280 			return -EAGAIN;
2281 		case -NFS4ERR_DELAY:
2282 		case -NFS4ERR_GRACE:
2283 			ssleep(1);
2284 			return -EAGAIN;
2285 		case -ENOMEM:
2286 		case -NFS4ERR_DENIED:
2287 			if (fl) {
2288 				struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2289 				if (lsp)
2290 					set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2291 			}
2292 			return 0;
2293 	}
2294 	return err;
2295 }
2296 
nfs4_open_delegation_recall(struct nfs_open_context * ctx,struct nfs4_state * state,const nfs4_stateid * stateid)2297 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2298 		struct nfs4_state *state, const nfs4_stateid *stateid)
2299 {
2300 	struct nfs_server *server = NFS_SERVER(state->inode);
2301 	struct nfs4_opendata *opendata;
2302 	int err = 0;
2303 
2304 	opendata = nfs4_open_recoverdata_alloc(ctx, state,
2305 			NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2306 	if (IS_ERR(opendata))
2307 		return PTR_ERR(opendata);
2308 	nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2309 	if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2310 		err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2311 		if (err)
2312 			goto out;
2313 	}
2314 	if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2315 		err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2316 		if (err)
2317 			goto out;
2318 	}
2319 	if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2320 		err = nfs4_open_recover_helper(opendata, FMODE_READ);
2321 		if (err)
2322 			goto out;
2323 	}
2324 	nfs_state_clear_delegation(state);
2325 out:
2326 	nfs4_opendata_put(opendata);
2327 	return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2328 }
2329 
nfs4_open_confirm_prepare(struct rpc_task * task,void * calldata)2330 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2331 {
2332 	struct nfs4_opendata *data = calldata;
2333 
2334 	nfs4_setup_sequence(data->o_arg.server->nfs_client,
2335 			   &data->c_arg.seq_args, &data->c_res.seq_res, task);
2336 }
2337 
nfs4_open_confirm_done(struct rpc_task * task,void * calldata)2338 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2339 {
2340 	struct nfs4_opendata *data = calldata;
2341 
2342 	nfs40_sequence_done(task, &data->c_res.seq_res);
2343 
2344 	data->rpc_status = task->tk_status;
2345 	if (data->rpc_status == 0) {
2346 		nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2347 		nfs_confirm_seqid(&data->owner->so_seqid, 0);
2348 		renew_lease(data->o_res.server, data->timestamp);
2349 		data->rpc_done = true;
2350 	}
2351 }
2352 
nfs4_open_confirm_release(void * calldata)2353 static void nfs4_open_confirm_release(void *calldata)
2354 {
2355 	struct nfs4_opendata *data = calldata;
2356 	struct nfs4_state *state = NULL;
2357 
2358 	/* If this request hasn't been cancelled, do nothing */
2359 	if (!data->cancelled)
2360 		goto out_free;
2361 	/* In case of error, no cleanup! */
2362 	if (!data->rpc_done)
2363 		goto out_free;
2364 	state = nfs4_opendata_to_nfs4_state(data);
2365 	if (!IS_ERR(state))
2366 		nfs4_close_state(state, data->o_arg.fmode);
2367 out_free:
2368 	nfs4_opendata_put(data);
2369 }
2370 
2371 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2372 	.rpc_call_prepare = nfs4_open_confirm_prepare,
2373 	.rpc_call_done = nfs4_open_confirm_done,
2374 	.rpc_release = nfs4_open_confirm_release,
2375 };
2376 
2377 /*
2378  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2379  */
_nfs4_proc_open_confirm(struct nfs4_opendata * data)2380 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2381 {
2382 	struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2383 	struct rpc_task *task;
2384 	struct  rpc_message msg = {
2385 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2386 		.rpc_argp = &data->c_arg,
2387 		.rpc_resp = &data->c_res,
2388 		.rpc_cred = data->owner->so_cred,
2389 	};
2390 	struct rpc_task_setup task_setup_data = {
2391 		.rpc_client = server->client,
2392 		.rpc_message = &msg,
2393 		.callback_ops = &nfs4_open_confirm_ops,
2394 		.callback_data = data,
2395 		.workqueue = nfsiod_workqueue,
2396 		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2397 	};
2398 	int status;
2399 
2400 	nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2401 				data->is_recover);
2402 	kref_get(&data->kref);
2403 	data->rpc_done = false;
2404 	data->rpc_status = 0;
2405 	data->timestamp = jiffies;
2406 	task = rpc_run_task(&task_setup_data);
2407 	if (IS_ERR(task))
2408 		return PTR_ERR(task);
2409 	status = rpc_wait_for_completion_task(task);
2410 	if (status != 0) {
2411 		data->cancelled = true;
2412 		smp_wmb();
2413 	} else
2414 		status = data->rpc_status;
2415 	rpc_put_task(task);
2416 	return status;
2417 }
2418 
nfs4_open_prepare(struct rpc_task * task,void * calldata)2419 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2420 {
2421 	struct nfs4_opendata *data = calldata;
2422 	struct nfs4_state_owner *sp = data->owner;
2423 	struct nfs_client *clp = sp->so_server->nfs_client;
2424 	enum open_claim_type4 claim = data->o_arg.claim;
2425 
2426 	if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2427 		goto out_wait;
2428 	/*
2429 	 * Check if we still need to send an OPEN call, or if we can use
2430 	 * a delegation instead.
2431 	 */
2432 	if (data->state != NULL) {
2433 		struct nfs_delegation *delegation;
2434 
2435 		if (can_open_cached(data->state, data->o_arg.fmode,
2436 					data->o_arg.open_flags, claim))
2437 			goto out_no_action;
2438 		rcu_read_lock();
2439 		delegation = nfs4_get_valid_delegation(data->state->inode);
2440 		if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2441 			goto unlock_no_action;
2442 		rcu_read_unlock();
2443 	}
2444 	/* Update client id. */
2445 	data->o_arg.clientid = clp->cl_clientid;
2446 	switch (claim) {
2447 	default:
2448 		break;
2449 	case NFS4_OPEN_CLAIM_PREVIOUS:
2450 	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2451 	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2452 		data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2453 		fallthrough;
2454 	case NFS4_OPEN_CLAIM_FH:
2455 		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2456 	}
2457 	data->timestamp = jiffies;
2458 	if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2459 				&data->o_arg.seq_args,
2460 				&data->o_res.seq_res,
2461 				task) != 0)
2462 		nfs_release_seqid(data->o_arg.seqid);
2463 
2464 	/* Set the create mode (note dependency on the session type) */
2465 	data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2466 	if (data->o_arg.open_flags & O_EXCL) {
2467 		data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2468 		if (clp->cl_mvops->minor_version == 0) {
2469 			data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2470 			/* don't put an ACCESS op in OPEN compound if O_EXCL,
2471 			 * because ACCESS will return permission denied for
2472 			 * all bits until close */
2473 			data->o_res.access_request = data->o_arg.access = 0;
2474 		} else if (nfs4_has_persistent_session(clp))
2475 			data->o_arg.createmode = NFS4_CREATE_GUARDED;
2476 	}
2477 	return;
2478 unlock_no_action:
2479 	trace_nfs4_cached_open(data->state);
2480 	rcu_read_unlock();
2481 out_no_action:
2482 	task->tk_action = NULL;
2483 out_wait:
2484 	nfs4_sequence_done(task, &data->o_res.seq_res);
2485 }
2486 
nfs4_open_done(struct rpc_task * task,void * calldata)2487 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2488 {
2489 	struct nfs4_opendata *data = calldata;
2490 
2491 	data->rpc_status = task->tk_status;
2492 
2493 	if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2494 		return;
2495 
2496 	if (task->tk_status == 0) {
2497 		if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2498 			switch (data->o_res.f_attr->mode & S_IFMT) {
2499 			case S_IFREG:
2500 				break;
2501 			case S_IFLNK:
2502 				data->rpc_status = -ELOOP;
2503 				break;
2504 			case S_IFDIR:
2505 				data->rpc_status = -EISDIR;
2506 				break;
2507 			default:
2508 				data->rpc_status = -ENOTDIR;
2509 			}
2510 		}
2511 		renew_lease(data->o_res.server, data->timestamp);
2512 		if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2513 			nfs_confirm_seqid(&data->owner->so_seqid, 0);
2514 	}
2515 	data->rpc_done = true;
2516 }
2517 
nfs4_open_release(void * calldata)2518 static void nfs4_open_release(void *calldata)
2519 {
2520 	struct nfs4_opendata *data = calldata;
2521 	struct nfs4_state *state = NULL;
2522 
2523 	/* If this request hasn't been cancelled, do nothing */
2524 	if (!data->cancelled)
2525 		goto out_free;
2526 	/* In case of error, no cleanup! */
2527 	if (data->rpc_status != 0 || !data->rpc_done)
2528 		goto out_free;
2529 	/* In case we need an open_confirm, no cleanup! */
2530 	if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2531 		goto out_free;
2532 	state = nfs4_opendata_to_nfs4_state(data);
2533 	if (!IS_ERR(state))
2534 		nfs4_close_state(state, data->o_arg.fmode);
2535 out_free:
2536 	nfs4_opendata_put(data);
2537 }
2538 
2539 static const struct rpc_call_ops nfs4_open_ops = {
2540 	.rpc_call_prepare = nfs4_open_prepare,
2541 	.rpc_call_done = nfs4_open_done,
2542 	.rpc_release = nfs4_open_release,
2543 };
2544 
nfs4_run_open_task(struct nfs4_opendata * data,struct nfs_open_context * ctx)2545 static int nfs4_run_open_task(struct nfs4_opendata *data,
2546 			      struct nfs_open_context *ctx)
2547 {
2548 	struct inode *dir = d_inode(data->dir);
2549 	struct nfs_server *server = NFS_SERVER(dir);
2550 	struct nfs_openargs *o_arg = &data->o_arg;
2551 	struct nfs_openres *o_res = &data->o_res;
2552 	struct rpc_task *task;
2553 	struct rpc_message msg = {
2554 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2555 		.rpc_argp = o_arg,
2556 		.rpc_resp = o_res,
2557 		.rpc_cred = data->owner->so_cred,
2558 	};
2559 	struct rpc_task_setup task_setup_data = {
2560 		.rpc_client = server->client,
2561 		.rpc_message = &msg,
2562 		.callback_ops = &nfs4_open_ops,
2563 		.callback_data = data,
2564 		.workqueue = nfsiod_workqueue,
2565 		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2566 	};
2567 	int status;
2568 
2569 	if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2570 		task_setup_data.flags |= RPC_TASK_MOVEABLE;
2571 
2572 	kref_get(&data->kref);
2573 	data->rpc_done = false;
2574 	data->rpc_status = 0;
2575 	data->cancelled = false;
2576 	data->is_recover = false;
2577 	if (!ctx) {
2578 		nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2579 		data->is_recover = true;
2580 		task_setup_data.flags |= RPC_TASK_TIMEOUT;
2581 	} else {
2582 		nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2583 		pnfs_lgopen_prepare(data, ctx);
2584 	}
2585 	task = rpc_run_task(&task_setup_data);
2586 	if (IS_ERR(task))
2587 		return PTR_ERR(task);
2588 	status = rpc_wait_for_completion_task(task);
2589 	if (status != 0) {
2590 		data->cancelled = true;
2591 		smp_wmb();
2592 	} else
2593 		status = data->rpc_status;
2594 	rpc_put_task(task);
2595 
2596 	return status;
2597 }
2598 
_nfs4_recover_proc_open(struct nfs4_opendata * data)2599 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2600 {
2601 	struct inode *dir = d_inode(data->dir);
2602 	struct nfs_openres *o_res = &data->o_res;
2603 	int status;
2604 
2605 	status = nfs4_run_open_task(data, NULL);
2606 	if (status != 0 || !data->rpc_done)
2607 		return status;
2608 
2609 	nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2610 
2611 	if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2612 		status = _nfs4_proc_open_confirm(data);
2613 
2614 	return status;
2615 }
2616 
2617 /*
2618  * Additional permission checks in order to distinguish between an
2619  * open for read, and an open for execute. This works around the
2620  * fact that NFSv4 OPEN treats read and execute permissions as being
2621  * the same.
2622  * Note that in the non-execute case, we want to turn off permission
2623  * checking if we just created a new file (POSIX open() semantics).
2624  */
nfs4_opendata_access(const struct cred * cred,struct nfs4_opendata * opendata,struct nfs4_state * state,fmode_t fmode,int openflags)2625 static int nfs4_opendata_access(const struct cred *cred,
2626 				struct nfs4_opendata *opendata,
2627 				struct nfs4_state *state, fmode_t fmode,
2628 				int openflags)
2629 {
2630 	struct nfs_access_entry cache;
2631 	u32 mask, flags;
2632 
2633 	/* access call failed or for some reason the server doesn't
2634 	 * support any access modes -- defer access call until later */
2635 	if (opendata->o_res.access_supported == 0)
2636 		return 0;
2637 
2638 	mask = 0;
2639 	/*
2640 	 * Use openflags to check for exec, because fmode won't
2641 	 * always have FMODE_EXEC set when file open for exec.
2642 	 */
2643 	if (openflags & __FMODE_EXEC) {
2644 		/* ONLY check for exec rights */
2645 		if (S_ISDIR(state->inode->i_mode))
2646 			mask = NFS4_ACCESS_LOOKUP;
2647 		else
2648 			mask = NFS4_ACCESS_EXECUTE;
2649 	} else if ((fmode & FMODE_READ) && !opendata->file_created)
2650 		mask = NFS4_ACCESS_READ;
2651 
2652 	nfs_access_set_mask(&cache, opendata->o_res.access_result);
2653 	nfs_access_add_cache(state->inode, &cache, cred);
2654 
2655 	flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2656 	if ((mask & ~cache.mask & flags) == 0)
2657 		return 0;
2658 
2659 	return -EACCES;
2660 }
2661 
2662 /*
2663  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2664  */
_nfs4_proc_open(struct nfs4_opendata * data,struct nfs_open_context * ctx)2665 static int _nfs4_proc_open(struct nfs4_opendata *data,
2666 			   struct nfs_open_context *ctx)
2667 {
2668 	struct inode *dir = d_inode(data->dir);
2669 	struct nfs_server *server = NFS_SERVER(dir);
2670 	struct nfs_openargs *o_arg = &data->o_arg;
2671 	struct nfs_openres *o_res = &data->o_res;
2672 	int status;
2673 
2674 	status = nfs4_run_open_task(data, ctx);
2675 	if (!data->rpc_done)
2676 		return status;
2677 	if (status != 0) {
2678 		if (status == -NFS4ERR_BADNAME &&
2679 				!(o_arg->open_flags & O_CREAT))
2680 			return -ENOENT;
2681 		return status;
2682 	}
2683 
2684 	nfs_fattr_map_and_free_names(server, &data->f_attr);
2685 
2686 	if (o_arg->open_flags & O_CREAT) {
2687 		if (o_arg->open_flags & O_EXCL)
2688 			data->file_created = true;
2689 		else if (o_res->cinfo.before != o_res->cinfo.after)
2690 			data->file_created = true;
2691 		if (data->file_created ||
2692 		    inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2693 			nfs4_update_changeattr(dir, &o_res->cinfo,
2694 					o_res->f_attr->time_start,
2695 					NFS_INO_INVALID_DATA);
2696 	}
2697 	if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2698 		server->caps &= ~NFS_CAP_POSIX_LOCK;
2699 	if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2700 		status = _nfs4_proc_open_confirm(data);
2701 		if (status != 0)
2702 			return status;
2703 	}
2704 	if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2705 		nfs4_sequence_free_slot(&o_res->seq_res);
2706 		nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL);
2707 	}
2708 	return 0;
2709 }
2710 
2711 /*
2712  * OPEN_EXPIRED:
2713  * 	reclaim state on the server after a network partition.
2714  * 	Assumes caller holds the appropriate lock
2715  */
_nfs4_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2716 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2717 {
2718 	struct nfs4_opendata *opendata;
2719 	int ret;
2720 
2721 	opendata = nfs4_open_recoverdata_alloc(ctx, state,
2722 			NFS4_OPEN_CLAIM_FH);
2723 	if (IS_ERR(opendata))
2724 		return PTR_ERR(opendata);
2725 	ret = nfs4_open_recover(opendata, state);
2726 	if (ret == -ESTALE)
2727 		d_drop(ctx->dentry);
2728 	nfs4_opendata_put(opendata);
2729 	return ret;
2730 }
2731 
nfs4_do_open_expired(struct nfs_open_context * ctx,struct nfs4_state * state)2732 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2733 {
2734 	struct nfs_server *server = NFS_SERVER(state->inode);
2735 	struct nfs4_exception exception = { };
2736 	int err;
2737 
2738 	do {
2739 		err = _nfs4_open_expired(ctx, state);
2740 		trace_nfs4_open_expired(ctx, 0, err);
2741 		if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2742 			continue;
2743 		switch (err) {
2744 		default:
2745 			goto out;
2746 		case -NFS4ERR_GRACE:
2747 		case -NFS4ERR_DELAY:
2748 			nfs4_handle_exception(server, err, &exception);
2749 			err = 0;
2750 		}
2751 	} while (exception.retry);
2752 out:
2753 	return err;
2754 }
2755 
nfs4_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2756 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2757 {
2758 	struct nfs_open_context *ctx;
2759 	int ret;
2760 
2761 	ctx = nfs4_state_find_open_context(state);
2762 	if (IS_ERR(ctx))
2763 		return -EAGAIN;
2764 	ret = nfs4_do_open_expired(ctx, state);
2765 	put_nfs_open_context(ctx);
2766 	return ret;
2767 }
2768 
nfs_finish_clear_delegation_stateid(struct nfs4_state * state,const nfs4_stateid * stateid)2769 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2770 		const nfs4_stateid *stateid)
2771 {
2772 	nfs_remove_bad_delegation(state->inode, stateid);
2773 	nfs_state_clear_delegation(state);
2774 }
2775 
nfs40_clear_delegation_stateid(struct nfs4_state * state)2776 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2777 {
2778 	if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2779 		nfs_finish_clear_delegation_stateid(state, NULL);
2780 }
2781 
nfs40_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2782 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2783 {
2784 	/* NFSv4.0 doesn't allow for delegation recovery on open expire */
2785 	nfs40_clear_delegation_stateid(state);
2786 	nfs_state_clear_open_state_flags(state);
2787 	return nfs4_open_expired(sp, state);
2788 }
2789 
nfs40_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2790 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2791 		nfs4_stateid *stateid,
2792 		const struct cred *cred)
2793 {
2794 	return -NFS4ERR_BAD_STATEID;
2795 }
2796 
2797 #if defined(CONFIG_NFS_V4_1)
nfs41_test_and_free_expired_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)2798 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2799 		nfs4_stateid *stateid,
2800 		const struct cred *cred)
2801 {
2802 	int status;
2803 
2804 	switch (stateid->type) {
2805 	default:
2806 		break;
2807 	case NFS4_INVALID_STATEID_TYPE:
2808 	case NFS4_SPECIAL_STATEID_TYPE:
2809 		return -NFS4ERR_BAD_STATEID;
2810 	case NFS4_REVOKED_STATEID_TYPE:
2811 		goto out_free;
2812 	}
2813 
2814 	status = nfs41_test_stateid(server, stateid, cred);
2815 	switch (status) {
2816 	case -NFS4ERR_EXPIRED:
2817 	case -NFS4ERR_ADMIN_REVOKED:
2818 	case -NFS4ERR_DELEG_REVOKED:
2819 		break;
2820 	default:
2821 		return status;
2822 	}
2823 out_free:
2824 	/* Ack the revoked state to the server */
2825 	nfs41_free_stateid(server, stateid, cred, true);
2826 	return -NFS4ERR_EXPIRED;
2827 }
2828 
nfs41_check_delegation_stateid(struct nfs4_state * state)2829 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2830 {
2831 	struct nfs_server *server = NFS_SERVER(state->inode);
2832 	nfs4_stateid stateid;
2833 	struct nfs_delegation *delegation;
2834 	const struct cred *cred = NULL;
2835 	int status, ret = NFS_OK;
2836 
2837 	/* Get the delegation credential for use by test/free_stateid */
2838 	rcu_read_lock();
2839 	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2840 	if (delegation == NULL) {
2841 		rcu_read_unlock();
2842 		nfs_state_clear_delegation(state);
2843 		return NFS_OK;
2844 	}
2845 
2846 	spin_lock(&delegation->lock);
2847 	nfs4_stateid_copy(&stateid, &delegation->stateid);
2848 
2849 	if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2850 				&delegation->flags)) {
2851 		spin_unlock(&delegation->lock);
2852 		rcu_read_unlock();
2853 		return NFS_OK;
2854 	}
2855 
2856 	if (delegation->cred)
2857 		cred = get_cred(delegation->cred);
2858 	spin_unlock(&delegation->lock);
2859 	rcu_read_unlock();
2860 	status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2861 	trace_nfs4_test_delegation_stateid(state, NULL, status);
2862 	if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2863 		nfs_finish_clear_delegation_stateid(state, &stateid);
2864 	else
2865 		ret = status;
2866 
2867 	put_cred(cred);
2868 	return ret;
2869 }
2870 
nfs41_delegation_recover_stateid(struct nfs4_state * state)2871 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2872 {
2873 	nfs4_stateid tmp;
2874 
2875 	if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2876 	    nfs4_copy_delegation_stateid(state->inode, state->state,
2877 				&tmp, NULL) &&
2878 	    nfs4_stateid_match_other(&state->stateid, &tmp))
2879 		nfs_state_set_delegation(state, &tmp, state->state);
2880 	else
2881 		nfs_state_clear_delegation(state);
2882 }
2883 
2884 /**
2885  * nfs41_check_expired_locks - possibly free a lock stateid
2886  *
2887  * @state: NFSv4 state for an inode
2888  *
2889  * Returns NFS_OK if recovery for this stateid is now finished.
2890  * Otherwise a negative NFS4ERR value is returned.
2891  */
nfs41_check_expired_locks(struct nfs4_state * state)2892 static int nfs41_check_expired_locks(struct nfs4_state *state)
2893 {
2894 	int status, ret = NFS_OK;
2895 	struct nfs4_lock_state *lsp, *prev = NULL;
2896 	struct nfs_server *server = NFS_SERVER(state->inode);
2897 
2898 	if (!test_bit(LK_STATE_IN_USE, &state->flags))
2899 		goto out;
2900 
2901 	spin_lock(&state->state_lock);
2902 	list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2903 		if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2904 			const struct cred *cred = lsp->ls_state->owner->so_cred;
2905 
2906 			refcount_inc(&lsp->ls_count);
2907 			spin_unlock(&state->state_lock);
2908 
2909 			nfs4_put_lock_state(prev);
2910 			prev = lsp;
2911 
2912 			status = nfs41_test_and_free_expired_stateid(server,
2913 					&lsp->ls_stateid,
2914 					cred);
2915 			trace_nfs4_test_lock_stateid(state, lsp, status);
2916 			if (status == -NFS4ERR_EXPIRED ||
2917 			    status == -NFS4ERR_BAD_STATEID) {
2918 				clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2919 				lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2920 				if (!recover_lost_locks)
2921 					set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2922 			} else if (status != NFS_OK) {
2923 				ret = status;
2924 				nfs4_put_lock_state(prev);
2925 				goto out;
2926 			}
2927 			spin_lock(&state->state_lock);
2928 		}
2929 	}
2930 	spin_unlock(&state->state_lock);
2931 	nfs4_put_lock_state(prev);
2932 out:
2933 	return ret;
2934 }
2935 
2936 /**
2937  * nfs41_check_open_stateid - possibly free an open stateid
2938  *
2939  * @state: NFSv4 state for an inode
2940  *
2941  * Returns NFS_OK if recovery for this stateid is now finished.
2942  * Otherwise a negative NFS4ERR value is returned.
2943  */
nfs41_check_open_stateid(struct nfs4_state * state)2944 static int nfs41_check_open_stateid(struct nfs4_state *state)
2945 {
2946 	struct nfs_server *server = NFS_SERVER(state->inode);
2947 	nfs4_stateid *stateid = &state->open_stateid;
2948 	const struct cred *cred = state->owner->so_cred;
2949 	int status;
2950 
2951 	if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2952 		return -NFS4ERR_BAD_STATEID;
2953 	status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2954 	trace_nfs4_test_open_stateid(state, NULL, status);
2955 	if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2956 		nfs_state_clear_open_state_flags(state);
2957 		stateid->type = NFS4_INVALID_STATEID_TYPE;
2958 		return status;
2959 	}
2960 	if (nfs_open_stateid_recover_openmode(state))
2961 		return -NFS4ERR_OPENMODE;
2962 	return NFS_OK;
2963 }
2964 
nfs41_open_expired(struct nfs4_state_owner * sp,struct nfs4_state * state)2965 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2966 {
2967 	int status;
2968 
2969 	status = nfs41_check_delegation_stateid(state);
2970 	if (status != NFS_OK)
2971 		return status;
2972 	nfs41_delegation_recover_stateid(state);
2973 
2974 	status = nfs41_check_expired_locks(state);
2975 	if (status != NFS_OK)
2976 		return status;
2977 	status = nfs41_check_open_stateid(state);
2978 	if (status != NFS_OK)
2979 		status = nfs4_open_expired(sp, state);
2980 	return status;
2981 }
2982 #endif
2983 
2984 /*
2985  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2986  * fields corresponding to attributes that were used to store the verifier.
2987  * Make sure we clobber those fields in the later setattr call
2988  */
nfs4_exclusive_attrset(struct nfs4_opendata * opendata,struct iattr * sattr,struct nfs4_label ** label)2989 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2990 				struct iattr *sattr, struct nfs4_label **label)
2991 {
2992 	const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2993 	__u32 attrset[3];
2994 	unsigned ret;
2995 	unsigned i;
2996 
2997 	for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2998 		attrset[i] = opendata->o_res.attrset[i];
2999 		if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3000 			attrset[i] &= ~bitmask[i];
3001 	}
3002 
3003 	ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3004 		sattr->ia_valid : 0;
3005 
3006 	if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3007 		if (sattr->ia_valid & ATTR_ATIME_SET)
3008 			ret |= ATTR_ATIME_SET;
3009 		else
3010 			ret |= ATTR_ATIME;
3011 	}
3012 
3013 	if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3014 		if (sattr->ia_valid & ATTR_MTIME_SET)
3015 			ret |= ATTR_MTIME_SET;
3016 		else
3017 			ret |= ATTR_MTIME;
3018 	}
3019 
3020 	if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3021 		*label = NULL;
3022 	return ret;
3023 }
3024 
_nfs4_open_and_get_state(struct nfs4_opendata * opendata,int flags,struct nfs_open_context * ctx)3025 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3026 		int flags, struct nfs_open_context *ctx)
3027 {
3028 	struct nfs4_state_owner *sp = opendata->owner;
3029 	struct nfs_server *server = sp->so_server;
3030 	struct dentry *dentry;
3031 	struct nfs4_state *state;
3032 	fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3033 	struct inode *dir = d_inode(opendata->dir);
3034 	unsigned long dir_verifier;
3035 	unsigned int seq;
3036 	int ret;
3037 
3038 	seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3039 	dir_verifier = nfs_save_change_attribute(dir);
3040 
3041 	ret = _nfs4_proc_open(opendata, ctx);
3042 	if (ret != 0)
3043 		goto out;
3044 
3045 	state = _nfs4_opendata_to_nfs4_state(opendata);
3046 	ret = PTR_ERR(state);
3047 	if (IS_ERR(state))
3048 		goto out;
3049 	ctx->state = state;
3050 	if (server->caps & NFS_CAP_POSIX_LOCK)
3051 		set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3052 	if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3053 		set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3054 	if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3055 		set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3056 
3057 	dentry = opendata->dentry;
3058 	if (d_really_is_negative(dentry)) {
3059 		struct dentry *alias;
3060 		d_drop(dentry);
3061 		alias = d_exact_alias(dentry, state->inode);
3062 		if (!alias)
3063 			alias = d_splice_alias(igrab(state->inode), dentry);
3064 		/* d_splice_alias() can't fail here - it's a non-directory */
3065 		if (alias) {
3066 			dput(ctx->dentry);
3067 			ctx->dentry = dentry = alias;
3068 		}
3069 	}
3070 
3071 	switch(opendata->o_arg.claim) {
3072 	default:
3073 		break;
3074 	case NFS4_OPEN_CLAIM_NULL:
3075 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3076 	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3077 		if (!opendata->rpc_done)
3078 			break;
3079 		if (opendata->o_res.delegation_type != 0)
3080 			dir_verifier = nfs_save_change_attribute(dir);
3081 		nfs_set_verifier(dentry, dir_verifier);
3082 	}
3083 
3084 	/* Parse layoutget results before we check for access */
3085 	pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3086 
3087 	ret = nfs4_opendata_access(sp->so_cred, opendata, state,
3088 			acc_mode, flags);
3089 	if (ret != 0)
3090 		goto out;
3091 
3092 	if (d_inode(dentry) == state->inode) {
3093 		nfs_inode_attach_open_context(ctx);
3094 		if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3095 			nfs4_schedule_stateid_recovery(server, state);
3096 	}
3097 
3098 out:
3099 	if (!opendata->cancelled) {
3100 		if (opendata->lgp) {
3101 			nfs4_lgopen_release(opendata->lgp);
3102 			opendata->lgp = NULL;
3103 		}
3104 		nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3105 	}
3106 	return ret;
3107 }
3108 
3109 /*
3110  * Returns a referenced nfs4_state
3111  */
_nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,const struct nfs4_open_createattrs * c,int * opened)3112 static int _nfs4_do_open(struct inode *dir,
3113 			struct nfs_open_context *ctx,
3114 			int flags,
3115 			const struct nfs4_open_createattrs *c,
3116 			int *opened)
3117 {
3118 	struct nfs4_state_owner  *sp;
3119 	struct nfs4_state     *state = NULL;
3120 	struct nfs_server       *server = NFS_SERVER(dir);
3121 	struct nfs4_opendata *opendata;
3122 	struct dentry *dentry = ctx->dentry;
3123 	const struct cred *cred = ctx->cred;
3124 	struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3125 	fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3126 	enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3127 	struct iattr *sattr = c->sattr;
3128 	struct nfs4_label *label = c->label;
3129 	int status;
3130 
3131 	/* Protect against reboot recovery conflicts */
3132 	status = -ENOMEM;
3133 	sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3134 	if (sp == NULL) {
3135 		dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3136 		goto out_err;
3137 	}
3138 	status = nfs4_client_recover_expired_lease(server->nfs_client);
3139 	if (status != 0)
3140 		goto err_put_state_owner;
3141 	if (d_really_is_positive(dentry))
3142 		nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3143 	status = -ENOMEM;
3144 	if (d_really_is_positive(dentry))
3145 		claim = NFS4_OPEN_CLAIM_FH;
3146 	opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3147 			c, claim, GFP_KERNEL);
3148 	if (opendata == NULL)
3149 		goto err_put_state_owner;
3150 
3151 	if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3152 		if (!opendata->f_attr.mdsthreshold) {
3153 			opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3154 			if (!opendata->f_attr.mdsthreshold)
3155 				goto err_opendata_put;
3156 		}
3157 		opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3158 	}
3159 	if (d_really_is_positive(dentry))
3160 		opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3161 
3162 	status = _nfs4_open_and_get_state(opendata, flags, ctx);
3163 	if (status != 0)
3164 		goto err_opendata_put;
3165 	state = ctx->state;
3166 
3167 	if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3168 	    (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3169 		unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3170 		/*
3171 		 * send create attributes which was not set by open
3172 		 * with an extra setattr.
3173 		 */
3174 		if (attrs || label) {
3175 			unsigned ia_old = sattr->ia_valid;
3176 
3177 			sattr->ia_valid = attrs;
3178 			nfs_fattr_init(opendata->o_res.f_attr);
3179 			status = nfs4_do_setattr(state->inode, cred,
3180 					opendata->o_res.f_attr, sattr,
3181 					ctx, label);
3182 			if (status == 0) {
3183 				nfs_setattr_update_inode(state->inode, sattr,
3184 						opendata->o_res.f_attr);
3185 				nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3186 			}
3187 			sattr->ia_valid = ia_old;
3188 		}
3189 	}
3190 	if (opened && opendata->file_created)
3191 		*opened = 1;
3192 
3193 	if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3194 		*ctx_th = opendata->f_attr.mdsthreshold;
3195 		opendata->f_attr.mdsthreshold = NULL;
3196 	}
3197 
3198 	nfs4_opendata_put(opendata);
3199 	nfs4_put_state_owner(sp);
3200 	return 0;
3201 err_opendata_put:
3202 	nfs4_opendata_put(opendata);
3203 err_put_state_owner:
3204 	nfs4_put_state_owner(sp);
3205 out_err:
3206 	return status;
3207 }
3208 
3209 
nfs4_do_open(struct inode * dir,struct nfs_open_context * ctx,int flags,struct iattr * sattr,struct nfs4_label * label,int * opened)3210 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3211 					struct nfs_open_context *ctx,
3212 					int flags,
3213 					struct iattr *sattr,
3214 					struct nfs4_label *label,
3215 					int *opened)
3216 {
3217 	struct nfs_server *server = NFS_SERVER(dir);
3218 	struct nfs4_exception exception = {
3219 		.interruptible = true,
3220 	};
3221 	struct nfs4_state *res;
3222 	struct nfs4_open_createattrs c = {
3223 		.label = label,
3224 		.sattr = sattr,
3225 		.verf = {
3226 			[0] = (__u32)jiffies,
3227 			[1] = (__u32)current->pid,
3228 		},
3229 	};
3230 	int status;
3231 
3232 	do {
3233 		status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3234 		res = ctx->state;
3235 		trace_nfs4_open_file(ctx, flags, status);
3236 		if (status == 0)
3237 			break;
3238 		/* NOTE: BAD_SEQID means the server and client disagree about the
3239 		 * book-keeping w.r.t. state-changing operations
3240 		 * (OPEN/CLOSE/LOCK/LOCKU...)
3241 		 * It is actually a sign of a bug on the client or on the server.
3242 		 *
3243 		 * If we receive a BAD_SEQID error in the particular case of
3244 		 * doing an OPEN, we assume that nfs_increment_open_seqid() will
3245 		 * have unhashed the old state_owner for us, and that we can
3246 		 * therefore safely retry using a new one. We should still warn
3247 		 * the user though...
3248 		 */
3249 		if (status == -NFS4ERR_BAD_SEQID) {
3250 			pr_warn_ratelimited("NFS: v4 server %s "
3251 					" returned a bad sequence-id error!\n",
3252 					NFS_SERVER(dir)->nfs_client->cl_hostname);
3253 			exception.retry = 1;
3254 			continue;
3255 		}
3256 		/*
3257 		 * BAD_STATEID on OPEN means that the server cancelled our
3258 		 * state before it received the OPEN_CONFIRM.
3259 		 * Recover by retrying the request as per the discussion
3260 		 * on Page 181 of RFC3530.
3261 		 */
3262 		if (status == -NFS4ERR_BAD_STATEID) {
3263 			exception.retry = 1;
3264 			continue;
3265 		}
3266 		if (status == -NFS4ERR_EXPIRED) {
3267 			nfs4_schedule_lease_recovery(server->nfs_client);
3268 			exception.retry = 1;
3269 			continue;
3270 		}
3271 		if (status == -EAGAIN) {
3272 			/* We must have found a delegation */
3273 			exception.retry = 1;
3274 			continue;
3275 		}
3276 		if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3277 			continue;
3278 		res = ERR_PTR(nfs4_handle_exception(server,
3279 					status, &exception));
3280 	} while (exception.retry);
3281 	return res;
3282 }
3283 
_nfs4_do_setattr(struct inode * inode,struct nfs_setattrargs * arg,struct nfs_setattrres * res,const struct cred * cred,struct nfs_open_context * ctx)3284 static int _nfs4_do_setattr(struct inode *inode,
3285 			    struct nfs_setattrargs *arg,
3286 			    struct nfs_setattrres *res,
3287 			    const struct cred *cred,
3288 			    struct nfs_open_context *ctx)
3289 {
3290 	struct nfs_server *server = NFS_SERVER(inode);
3291 	struct rpc_message msg = {
3292 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3293 		.rpc_argp	= arg,
3294 		.rpc_resp	= res,
3295 		.rpc_cred	= cred,
3296 	};
3297 	const struct cred *delegation_cred = NULL;
3298 	unsigned long timestamp = jiffies;
3299 	bool truncate;
3300 	int status;
3301 
3302 	nfs_fattr_init(res->fattr);
3303 
3304 	/* Servers should only apply open mode checks for file size changes */
3305 	truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3306 	if (!truncate) {
3307 		nfs4_inode_make_writeable(inode);
3308 		goto zero_stateid;
3309 	}
3310 
3311 	if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3312 		/* Use that stateid */
3313 	} else if (ctx != NULL && ctx->state) {
3314 		struct nfs_lock_context *l_ctx;
3315 		if (!nfs4_valid_open_stateid(ctx->state))
3316 			return -EBADF;
3317 		l_ctx = nfs_get_lock_context(ctx);
3318 		if (IS_ERR(l_ctx))
3319 			return PTR_ERR(l_ctx);
3320 		status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3321 						&arg->stateid, &delegation_cred);
3322 		nfs_put_lock_context(l_ctx);
3323 		if (status == -EIO)
3324 			return -EBADF;
3325 		else if (status == -EAGAIN)
3326 			goto zero_stateid;
3327 	} else {
3328 zero_stateid:
3329 		nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3330 	}
3331 	if (delegation_cred)
3332 		msg.rpc_cred = delegation_cred;
3333 
3334 	status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3335 
3336 	put_cred(delegation_cred);
3337 	if (status == 0 && ctx != NULL)
3338 		renew_lease(server, timestamp);
3339 	trace_nfs4_setattr(inode, &arg->stateid, status);
3340 	return status;
3341 }
3342 
nfs4_do_setattr(struct inode * inode,const struct cred * cred,struct nfs_fattr * fattr,struct iattr * sattr,struct nfs_open_context * ctx,struct nfs4_label * ilabel)3343 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3344 			   struct nfs_fattr *fattr, struct iattr *sattr,
3345 			   struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3346 {
3347 	struct nfs_server *server = NFS_SERVER(inode);
3348 	__u32 bitmask[NFS4_BITMASK_SZ];
3349 	struct nfs4_state *state = ctx ? ctx->state : NULL;
3350 	struct nfs_setattrargs	arg = {
3351 		.fh		= NFS_FH(inode),
3352 		.iap		= sattr,
3353 		.server		= server,
3354 		.bitmask = bitmask,
3355 		.label		= ilabel,
3356 	};
3357 	struct nfs_setattrres  res = {
3358 		.fattr		= fattr,
3359 		.server		= server,
3360 	};
3361 	struct nfs4_exception exception = {
3362 		.state = state,
3363 		.inode = inode,
3364 		.stateid = &arg.stateid,
3365 	};
3366 	unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3367 	int err;
3368 
3369 	if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3370 		adjust_flags |= NFS_INO_INVALID_MODE;
3371 	if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3372 		adjust_flags |= NFS_INO_INVALID_OTHER;
3373 
3374 	do {
3375 		nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3376 					inode, adjust_flags);
3377 
3378 		err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3379 		switch (err) {
3380 		case -NFS4ERR_OPENMODE:
3381 			if (!(sattr->ia_valid & ATTR_SIZE)) {
3382 				pr_warn_once("NFSv4: server %s is incorrectly "
3383 						"applying open mode checks to "
3384 						"a SETATTR that is not "
3385 						"changing file size.\n",
3386 						server->nfs_client->cl_hostname);
3387 			}
3388 			if (state && !(state->state & FMODE_WRITE)) {
3389 				err = -EBADF;
3390 				if (sattr->ia_valid & ATTR_OPEN)
3391 					err = -EACCES;
3392 				goto out;
3393 			}
3394 		}
3395 		err = nfs4_handle_exception(server, err, &exception);
3396 	} while (exception.retry);
3397 out:
3398 	return err;
3399 }
3400 
3401 static bool
nfs4_wait_on_layoutreturn(struct inode * inode,struct rpc_task * task)3402 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3403 {
3404 	if (inode == NULL || !nfs_have_layout(inode))
3405 		return false;
3406 
3407 	return pnfs_wait_on_layoutreturn(inode, task);
3408 }
3409 
3410 /*
3411  * Update the seqid of an open stateid
3412  */
nfs4_sync_open_stateid(nfs4_stateid * dst,struct nfs4_state * state)3413 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3414 		struct nfs4_state *state)
3415 {
3416 	__be32 seqid_open;
3417 	u32 dst_seqid;
3418 	int seq;
3419 
3420 	for (;;) {
3421 		if (!nfs4_valid_open_stateid(state))
3422 			break;
3423 		seq = read_seqbegin(&state->seqlock);
3424 		if (!nfs4_state_match_open_stateid_other(state, dst)) {
3425 			nfs4_stateid_copy(dst, &state->open_stateid);
3426 			if (read_seqretry(&state->seqlock, seq))
3427 				continue;
3428 			break;
3429 		}
3430 		seqid_open = state->open_stateid.seqid;
3431 		if (read_seqretry(&state->seqlock, seq))
3432 			continue;
3433 
3434 		dst_seqid = be32_to_cpu(dst->seqid);
3435 		if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3436 			dst->seqid = seqid_open;
3437 		break;
3438 	}
3439 }
3440 
3441 /*
3442  * Update the seqid of an open stateid after receiving
3443  * NFS4ERR_OLD_STATEID
3444  */
nfs4_refresh_open_old_stateid(nfs4_stateid * dst,struct nfs4_state * state)3445 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3446 		struct nfs4_state *state)
3447 {
3448 	__be32 seqid_open;
3449 	u32 dst_seqid;
3450 	bool ret;
3451 	int seq, status = -EAGAIN;
3452 	DEFINE_WAIT(wait);
3453 
3454 	for (;;) {
3455 		ret = false;
3456 		if (!nfs4_valid_open_stateid(state))
3457 			break;
3458 		seq = read_seqbegin(&state->seqlock);
3459 		if (!nfs4_state_match_open_stateid_other(state, dst)) {
3460 			if (read_seqretry(&state->seqlock, seq))
3461 				continue;
3462 			break;
3463 		}
3464 
3465 		write_seqlock(&state->seqlock);
3466 		seqid_open = state->open_stateid.seqid;
3467 
3468 		dst_seqid = be32_to_cpu(dst->seqid);
3469 
3470 		/* Did another OPEN bump the state's seqid?  try again: */
3471 		if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3472 			dst->seqid = seqid_open;
3473 			write_sequnlock(&state->seqlock);
3474 			ret = true;
3475 			break;
3476 		}
3477 
3478 		/* server says we're behind but we haven't seen the update yet */
3479 		set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3480 		prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3481 		write_sequnlock(&state->seqlock);
3482 		trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3483 
3484 		if (fatal_signal_pending(current))
3485 			status = -EINTR;
3486 		else
3487 			if (schedule_timeout(5*HZ) != 0)
3488 				status = 0;
3489 
3490 		finish_wait(&state->waitq, &wait);
3491 
3492 		if (!status)
3493 			continue;
3494 		if (status == -EINTR)
3495 			break;
3496 
3497 		/* we slept the whole 5 seconds, we must have lost a seqid */
3498 		dst->seqid = cpu_to_be32(dst_seqid + 1);
3499 		ret = true;
3500 		break;
3501 	}
3502 
3503 	return ret;
3504 }
3505 
3506 struct nfs4_closedata {
3507 	struct inode *inode;
3508 	struct nfs4_state *state;
3509 	struct nfs_closeargs arg;
3510 	struct nfs_closeres res;
3511 	struct {
3512 		struct nfs4_layoutreturn_args arg;
3513 		struct nfs4_layoutreturn_res res;
3514 		struct nfs4_xdr_opaque_data ld_private;
3515 		u32 roc_barrier;
3516 		bool roc;
3517 	} lr;
3518 	struct nfs_fattr fattr;
3519 	unsigned long timestamp;
3520 };
3521 
nfs4_free_closedata(void * data)3522 static void nfs4_free_closedata(void *data)
3523 {
3524 	struct nfs4_closedata *calldata = data;
3525 	struct nfs4_state_owner *sp = calldata->state->owner;
3526 	struct super_block *sb = calldata->state->inode->i_sb;
3527 
3528 	if (calldata->lr.roc)
3529 		pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3530 				calldata->res.lr_ret);
3531 	nfs4_put_open_state(calldata->state);
3532 	nfs_free_seqid(calldata->arg.seqid);
3533 	nfs4_put_state_owner(sp);
3534 	nfs_sb_deactive(sb);
3535 	kfree(calldata);
3536 }
3537 
nfs4_close_done(struct rpc_task * task,void * data)3538 static void nfs4_close_done(struct rpc_task *task, void *data)
3539 {
3540 	struct nfs4_closedata *calldata = data;
3541 	struct nfs4_state *state = calldata->state;
3542 	struct nfs_server *server = NFS_SERVER(calldata->inode);
3543 	nfs4_stateid *res_stateid = NULL;
3544 	struct nfs4_exception exception = {
3545 		.state = state,
3546 		.inode = calldata->inode,
3547 		.stateid = &calldata->arg.stateid,
3548 	};
3549 
3550 	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3551 		return;
3552 	trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3553 
3554 	/* Handle Layoutreturn errors */
3555 	if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3556 			  &calldata->res.lr_ret) == -EAGAIN)
3557 		goto out_restart;
3558 
3559 	/* hmm. we are done with the inode, and in the process of freeing
3560 	 * the state_owner. we keep this around to process errors
3561 	 */
3562 	switch (task->tk_status) {
3563 		case 0:
3564 			res_stateid = &calldata->res.stateid;
3565 			renew_lease(server, calldata->timestamp);
3566 			break;
3567 		case -NFS4ERR_ACCESS:
3568 			if (calldata->arg.bitmask != NULL) {
3569 				calldata->arg.bitmask = NULL;
3570 				calldata->res.fattr = NULL;
3571 				goto out_restart;
3572 
3573 			}
3574 			break;
3575 		case -NFS4ERR_OLD_STATEID:
3576 			/* Did we race with OPEN? */
3577 			if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3578 						state))
3579 				goto out_restart;
3580 			goto out_release;
3581 		case -NFS4ERR_ADMIN_REVOKED:
3582 		case -NFS4ERR_STALE_STATEID:
3583 		case -NFS4ERR_EXPIRED:
3584 			nfs4_free_revoked_stateid(server,
3585 					&calldata->arg.stateid,
3586 					task->tk_msg.rpc_cred);
3587 			fallthrough;
3588 		case -NFS4ERR_BAD_STATEID:
3589 			if (calldata->arg.fmode == 0)
3590 				break;
3591 			fallthrough;
3592 		default:
3593 			task->tk_status = nfs4_async_handle_exception(task,
3594 					server, task->tk_status, &exception);
3595 			if (exception.retry)
3596 				goto out_restart;
3597 	}
3598 	nfs_clear_open_stateid(state, &calldata->arg.stateid,
3599 			res_stateid, calldata->arg.fmode);
3600 out_release:
3601 	task->tk_status = 0;
3602 	nfs_release_seqid(calldata->arg.seqid);
3603 	nfs_refresh_inode(calldata->inode, &calldata->fattr);
3604 	dprintk("%s: ret = %d\n", __func__, task->tk_status);
3605 	return;
3606 out_restart:
3607 	task->tk_status = 0;
3608 	rpc_restart_call_prepare(task);
3609 	goto out_release;
3610 }
3611 
nfs4_close_prepare(struct rpc_task * task,void * data)3612 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3613 {
3614 	struct nfs4_closedata *calldata = data;
3615 	struct nfs4_state *state = calldata->state;
3616 	struct inode *inode = calldata->inode;
3617 	struct nfs_server *server = NFS_SERVER(inode);
3618 	struct pnfs_layout_hdr *lo;
3619 	bool is_rdonly, is_wronly, is_rdwr;
3620 	int call_close = 0;
3621 
3622 	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3623 		goto out_wait;
3624 
3625 	task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3626 	spin_lock(&state->owner->so_lock);
3627 	is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3628 	is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3629 	is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3630 	/* Calculate the change in open mode */
3631 	calldata->arg.fmode = 0;
3632 	if (state->n_rdwr == 0) {
3633 		if (state->n_rdonly == 0)
3634 			call_close |= is_rdonly;
3635 		else if (is_rdonly)
3636 			calldata->arg.fmode |= FMODE_READ;
3637 		if (state->n_wronly == 0)
3638 			call_close |= is_wronly;
3639 		else if (is_wronly)
3640 			calldata->arg.fmode |= FMODE_WRITE;
3641 		if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3642 			call_close |= is_rdwr;
3643 	} else if (is_rdwr)
3644 		calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3645 
3646 	nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3647 	if (!nfs4_valid_open_stateid(state))
3648 		call_close = 0;
3649 	spin_unlock(&state->owner->so_lock);
3650 
3651 	if (!call_close) {
3652 		/* Note: exit _without_ calling nfs4_close_done */
3653 		goto out_no_action;
3654 	}
3655 
3656 	if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3657 		nfs_release_seqid(calldata->arg.seqid);
3658 		goto out_wait;
3659 	}
3660 
3661 	lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3662 	if (lo && !pnfs_layout_is_valid(lo)) {
3663 		calldata->arg.lr_args = NULL;
3664 		calldata->res.lr_res = NULL;
3665 	}
3666 
3667 	if (calldata->arg.fmode == 0)
3668 		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3669 
3670 	if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3671 		/* Close-to-open cache consistency revalidation */
3672 		if (!nfs4_have_delegation(inode, FMODE_READ)) {
3673 			nfs4_bitmask_set(calldata->arg.bitmask_store,
3674 					 server->cache_consistency_bitmask,
3675 					 inode, 0);
3676 			calldata->arg.bitmask = calldata->arg.bitmask_store;
3677 		} else
3678 			calldata->arg.bitmask = NULL;
3679 	}
3680 
3681 	calldata->arg.share_access =
3682 		nfs4_map_atomic_open_share(NFS_SERVER(inode),
3683 				calldata->arg.fmode, 0);
3684 
3685 	if (calldata->res.fattr == NULL)
3686 		calldata->arg.bitmask = NULL;
3687 	else if (calldata->arg.bitmask == NULL)
3688 		calldata->res.fattr = NULL;
3689 	calldata->timestamp = jiffies;
3690 	if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3691 				&calldata->arg.seq_args,
3692 				&calldata->res.seq_res,
3693 				task) != 0)
3694 		nfs_release_seqid(calldata->arg.seqid);
3695 	return;
3696 out_no_action:
3697 	task->tk_action = NULL;
3698 out_wait:
3699 	nfs4_sequence_done(task, &calldata->res.seq_res);
3700 }
3701 
3702 static const struct rpc_call_ops nfs4_close_ops = {
3703 	.rpc_call_prepare = nfs4_close_prepare,
3704 	.rpc_call_done = nfs4_close_done,
3705 	.rpc_release = nfs4_free_closedata,
3706 };
3707 
3708 /*
3709  * It is possible for data to be read/written from a mem-mapped file
3710  * after the sys_close call (which hits the vfs layer as a flush).
3711  * This means that we can't safely call nfsv4 close on a file until
3712  * the inode is cleared. This in turn means that we are not good
3713  * NFSv4 citizens - we do not indicate to the server to update the file's
3714  * share state even when we are done with one of the three share
3715  * stateid's in the inode.
3716  *
3717  * NOTE: Caller must be holding the sp->so_owner semaphore!
3718  */
nfs4_do_close(struct nfs4_state * state,gfp_t gfp_mask,int wait)3719 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3720 {
3721 	struct nfs_server *server = NFS_SERVER(state->inode);
3722 	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3723 	struct nfs4_closedata *calldata;
3724 	struct nfs4_state_owner *sp = state->owner;
3725 	struct rpc_task *task;
3726 	struct rpc_message msg = {
3727 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3728 		.rpc_cred = state->owner->so_cred,
3729 	};
3730 	struct rpc_task_setup task_setup_data = {
3731 		.rpc_client = server->client,
3732 		.rpc_message = &msg,
3733 		.callback_ops = &nfs4_close_ops,
3734 		.workqueue = nfsiod_workqueue,
3735 		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3736 	};
3737 	int status = -ENOMEM;
3738 
3739 	if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3740 		task_setup_data.flags |= RPC_TASK_MOVEABLE;
3741 
3742 	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3743 		&task_setup_data.rpc_client, &msg);
3744 
3745 	calldata = kzalloc(sizeof(*calldata), gfp_mask);
3746 	if (calldata == NULL)
3747 		goto out;
3748 	nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3749 	calldata->inode = state->inode;
3750 	calldata->state = state;
3751 	calldata->arg.fh = NFS_FH(state->inode);
3752 	if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3753 		goto out_free_calldata;
3754 	/* Serialization for the sequence id */
3755 	alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3756 	calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3757 	if (IS_ERR(calldata->arg.seqid))
3758 		goto out_free_calldata;
3759 	nfs_fattr_init(&calldata->fattr);
3760 	calldata->arg.fmode = 0;
3761 	calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3762 	calldata->res.fattr = &calldata->fattr;
3763 	calldata->res.seqid = calldata->arg.seqid;
3764 	calldata->res.server = server;
3765 	calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3766 	calldata->lr.roc = pnfs_roc(state->inode,
3767 			&calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3768 	if (calldata->lr.roc) {
3769 		calldata->arg.lr_args = &calldata->lr.arg;
3770 		calldata->res.lr_res = &calldata->lr.res;
3771 	}
3772 	nfs_sb_active(calldata->inode->i_sb);
3773 
3774 	msg.rpc_argp = &calldata->arg;
3775 	msg.rpc_resp = &calldata->res;
3776 	task_setup_data.callback_data = calldata;
3777 	task = rpc_run_task(&task_setup_data);
3778 	if (IS_ERR(task))
3779 		return PTR_ERR(task);
3780 	status = 0;
3781 	if (wait)
3782 		status = rpc_wait_for_completion_task(task);
3783 	rpc_put_task(task);
3784 	return status;
3785 out_free_calldata:
3786 	kfree(calldata);
3787 out:
3788 	nfs4_put_open_state(state);
3789 	nfs4_put_state_owner(sp);
3790 	return status;
3791 }
3792 
3793 static struct inode *
nfs4_atomic_open(struct inode * dir,struct nfs_open_context * ctx,int open_flags,struct iattr * attr,int * opened)3794 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3795 		int open_flags, struct iattr *attr, int *opened)
3796 {
3797 	struct nfs4_state *state;
3798 	struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3799 
3800 	label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3801 
3802 	/* Protect against concurrent sillydeletes */
3803 	state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3804 
3805 	nfs4_label_release_security(label);
3806 
3807 	if (IS_ERR(state))
3808 		return ERR_CAST(state);
3809 	return state->inode;
3810 }
3811 
nfs4_close_context(struct nfs_open_context * ctx,int is_sync)3812 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3813 {
3814 	if (ctx->state == NULL)
3815 		return;
3816 	if (is_sync)
3817 		nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3818 	else
3819 		nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3820 }
3821 
3822 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3823 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3824 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3825 
_nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3826 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3827 {
3828 	u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3829 	struct nfs4_server_caps_arg args = {
3830 		.fhandle = fhandle,
3831 		.bitmask = bitmask,
3832 	};
3833 	struct nfs4_server_caps_res res = {};
3834 	struct rpc_message msg = {
3835 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3836 		.rpc_argp = &args,
3837 		.rpc_resp = &res,
3838 	};
3839 	int status;
3840 	int i;
3841 
3842 	bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3843 		     FATTR4_WORD0_FH_EXPIRE_TYPE |
3844 		     FATTR4_WORD0_LINK_SUPPORT |
3845 		     FATTR4_WORD0_SYMLINK_SUPPORT |
3846 		     FATTR4_WORD0_ACLSUPPORT |
3847 		     FATTR4_WORD0_CASE_INSENSITIVE |
3848 		     FATTR4_WORD0_CASE_PRESERVING;
3849 	if (minorversion)
3850 		bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3851 
3852 	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3853 	if (status == 0) {
3854 		/* Sanity check the server answers */
3855 		switch (minorversion) {
3856 		case 0:
3857 			res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3858 			res.attr_bitmask[2] = 0;
3859 			break;
3860 		case 1:
3861 			res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3862 			break;
3863 		case 2:
3864 			res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3865 		}
3866 		memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3867 		server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3868 				  NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3869 		server->fattr_valid = NFS_ATTR_FATTR_V4;
3870 		if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3871 				res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3872 			server->caps |= NFS_CAP_ACLS;
3873 		if (res.has_links != 0)
3874 			server->caps |= NFS_CAP_HARDLINKS;
3875 		if (res.has_symlinks != 0)
3876 			server->caps |= NFS_CAP_SYMLINKS;
3877 		if (res.case_insensitive)
3878 			server->caps |= NFS_CAP_CASE_INSENSITIVE;
3879 		if (res.case_preserving)
3880 			server->caps |= NFS_CAP_CASE_PRESERVING;
3881 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3882 		if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3883 			server->caps |= NFS_CAP_SECURITY_LABEL;
3884 #endif
3885 		if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3886 			server->caps |= NFS_CAP_FS_LOCATIONS;
3887 		if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3888 			server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3889 		if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3890 			server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3891 		if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3892 			server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3893 		if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3894 			server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3895 				NFS_ATTR_FATTR_OWNER_NAME);
3896 		if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3897 			server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3898 				NFS_ATTR_FATTR_GROUP_NAME);
3899 		if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3900 			server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3901 		if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3902 			server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3903 		if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3904 			server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3905 		if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3906 			server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3907 		memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3908 				sizeof(server->attr_bitmask));
3909 		server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3910 
3911 		memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3912 		server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3913 		server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3914 		server->cache_consistency_bitmask[2] = 0;
3915 
3916 		/* Avoid a regression due to buggy server */
3917 		for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3918 			res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3919 		memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3920 			sizeof(server->exclcreat_bitmask));
3921 
3922 		server->acl_bitmask = res.acl_bitmask;
3923 		server->fh_expire_type = res.fh_expire_type;
3924 	}
3925 
3926 	return status;
3927 }
3928 
nfs4_server_capabilities(struct nfs_server * server,struct nfs_fh * fhandle)3929 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3930 {
3931 	struct nfs4_exception exception = {
3932 		.interruptible = true,
3933 	};
3934 	int err;
3935 
3936 	nfs4_server_set_init_caps(server);
3937 	do {
3938 		err = nfs4_handle_exception(server,
3939 				_nfs4_server_capabilities(server, fhandle),
3940 				&exception);
3941 	} while (exception.retry);
3942 	return err;
3943 }
3944 
test_fs_location_for_trunking(struct nfs4_fs_location * location,struct nfs_client * clp,struct nfs_server * server)3945 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3946 					  struct nfs_client *clp,
3947 					  struct nfs_server *server)
3948 {
3949 	int i;
3950 
3951 	for (i = 0; i < location->nservers; i++) {
3952 		struct nfs4_string *srv_loc = &location->servers[i];
3953 		struct sockaddr addr;
3954 		size_t addrlen;
3955 		struct xprt_create xprt_args = {
3956 			.ident = 0,
3957 			.net = clp->cl_net,
3958 		};
3959 		struct nfs4_add_xprt_data xprtdata = {
3960 			.clp = clp,
3961 		};
3962 		struct rpc_add_xprt_test rpcdata = {
3963 			.add_xprt_test = clp->cl_mvops->session_trunk,
3964 			.data = &xprtdata,
3965 		};
3966 		char *servername = NULL;
3967 
3968 		if (!srv_loc->len)
3969 			continue;
3970 
3971 		addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
3972 						&addr, sizeof(addr),
3973 						clp->cl_net, server->port);
3974 		if (!addrlen)
3975 			return;
3976 		xprt_args.dstaddr = &addr;
3977 		xprt_args.addrlen = addrlen;
3978 		servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
3979 		if (!servername)
3980 			return;
3981 		memcpy(servername, srv_loc->data, srv_loc->len);
3982 		servername[srv_loc->len] = '\0';
3983 		xprt_args.servername = servername;
3984 
3985 		xprtdata.cred = nfs4_get_clid_cred(clp);
3986 		rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
3987 				  rpc_clnt_setup_test_and_add_xprt,
3988 				  &rpcdata);
3989 		if (xprtdata.cred)
3990 			put_cred(xprtdata.cred);
3991 		kfree(servername);
3992 	}
3993 }
3994 
_nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)3995 static int _nfs4_discover_trunking(struct nfs_server *server,
3996 				   struct nfs_fh *fhandle)
3997 {
3998 	struct nfs4_fs_locations *locations = NULL;
3999 	struct page *page;
4000 	const struct cred *cred;
4001 	struct nfs_client *clp = server->nfs_client;
4002 	const struct nfs4_state_maintenance_ops *ops =
4003 		clp->cl_mvops->state_renewal_ops;
4004 	int status = -ENOMEM, i;
4005 
4006 	cred = ops->get_state_renewal_cred(clp);
4007 	if (cred == NULL) {
4008 		cred = nfs4_get_clid_cred(clp);
4009 		if (cred == NULL)
4010 			return -ENOKEY;
4011 	}
4012 
4013 	page = alloc_page(GFP_KERNEL);
4014 	if (!page)
4015 		return -ENOMEM;
4016 	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4017 	if (!locations)
4018 		goto out_free;
4019 	locations->fattr = nfs_alloc_fattr();
4020 	if (!locations->fattr)
4021 		goto out_free_2;
4022 
4023 	status = nfs4_proc_get_locations(server, fhandle, locations, page,
4024 					 cred);
4025 	if (status)
4026 		goto out_free_3;
4027 
4028 	for (i = 0; i < locations->nlocations; i++)
4029 		test_fs_location_for_trunking(&locations->locations[i], clp,
4030 					      server);
4031 out_free_3:
4032 	kfree(locations->fattr);
4033 out_free_2:
4034 	kfree(locations);
4035 out_free:
4036 	__free_page(page);
4037 	return status;
4038 }
4039 
nfs4_discover_trunking(struct nfs_server * server,struct nfs_fh * fhandle)4040 static int nfs4_discover_trunking(struct nfs_server *server,
4041 				  struct nfs_fh *fhandle)
4042 {
4043 	struct nfs4_exception exception = {
4044 		.interruptible = true,
4045 	};
4046 	struct nfs_client *clp = server->nfs_client;
4047 	int err = 0;
4048 
4049 	if (!nfs4_has_session(clp))
4050 		goto out;
4051 	do {
4052 		err = nfs4_handle_exception(server,
4053 				_nfs4_discover_trunking(server, fhandle),
4054 				&exception);
4055 	} while (exception.retry);
4056 out:
4057 	return err;
4058 }
4059 
_nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4060 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4061 		struct nfs_fsinfo *info)
4062 {
4063 	u32 bitmask[3];
4064 	struct nfs4_lookup_root_arg args = {
4065 		.bitmask = bitmask,
4066 	};
4067 	struct nfs4_lookup_res res = {
4068 		.server = server,
4069 		.fattr = info->fattr,
4070 		.fh = fhandle,
4071 	};
4072 	struct rpc_message msg = {
4073 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4074 		.rpc_argp = &args,
4075 		.rpc_resp = &res,
4076 	};
4077 
4078 	bitmask[0] = nfs4_fattr_bitmap[0];
4079 	bitmask[1] = nfs4_fattr_bitmap[1];
4080 	/*
4081 	 * Process the label in the upcoming getfattr
4082 	 */
4083 	bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4084 
4085 	nfs_fattr_init(info->fattr);
4086 	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4087 }
4088 
nfs4_lookup_root(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4089 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4090 		struct nfs_fsinfo *info)
4091 {
4092 	struct nfs4_exception exception = {
4093 		.interruptible = true,
4094 	};
4095 	int err;
4096 	do {
4097 		err = _nfs4_lookup_root(server, fhandle, info);
4098 		trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4099 		switch (err) {
4100 		case 0:
4101 		case -NFS4ERR_WRONGSEC:
4102 			goto out;
4103 		default:
4104 			err = nfs4_handle_exception(server, err, &exception);
4105 		}
4106 	} while (exception.retry);
4107 out:
4108 	return err;
4109 }
4110 
nfs4_lookup_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,rpc_authflavor_t flavor)4111 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4112 				struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4113 {
4114 	struct rpc_auth_create_args auth_args = {
4115 		.pseudoflavor = flavor,
4116 	};
4117 	struct rpc_auth *auth;
4118 
4119 	auth = rpcauth_create(&auth_args, server->client);
4120 	if (IS_ERR(auth))
4121 		return -EACCES;
4122 	return nfs4_lookup_root(server, fhandle, info);
4123 }
4124 
4125 /*
4126  * Retry pseudoroot lookup with various security flavors.  We do this when:
4127  *
4128  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4129  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4130  *
4131  * Returns zero on success, or a negative NFS4ERR value, or a
4132  * negative errno value.
4133  */
nfs4_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)4134 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4135 			      struct nfs_fsinfo *info)
4136 {
4137 	/* Per 3530bis 15.33.5 */
4138 	static const rpc_authflavor_t flav_array[] = {
4139 		RPC_AUTH_GSS_KRB5P,
4140 		RPC_AUTH_GSS_KRB5I,
4141 		RPC_AUTH_GSS_KRB5,
4142 		RPC_AUTH_UNIX,			/* courtesy */
4143 		RPC_AUTH_NULL,
4144 	};
4145 	int status = -EPERM;
4146 	size_t i;
4147 
4148 	if (server->auth_info.flavor_len > 0) {
4149 		/* try each flavor specified by user */
4150 		for (i = 0; i < server->auth_info.flavor_len; i++) {
4151 			status = nfs4_lookup_root_sec(server, fhandle, info,
4152 						server->auth_info.flavors[i]);
4153 			if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4154 				continue;
4155 			break;
4156 		}
4157 	} else {
4158 		/* no flavors specified by user, try default list */
4159 		for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4160 			status = nfs4_lookup_root_sec(server, fhandle, info,
4161 						      flav_array[i]);
4162 			if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4163 				continue;
4164 			break;
4165 		}
4166 	}
4167 
4168 	/*
4169 	 * -EACCES could mean that the user doesn't have correct permissions
4170 	 * to access the mount.  It could also mean that we tried to mount
4171 	 * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4172 	 * existing mount programs don't handle -EACCES very well so it should
4173 	 * be mapped to -EPERM instead.
4174 	 */
4175 	if (status == -EACCES)
4176 		status = -EPERM;
4177 	return status;
4178 }
4179 
4180 /**
4181  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4182  * @server: initialized nfs_server handle
4183  * @fhandle: we fill in the pseudo-fs root file handle
4184  * @info: we fill in an FSINFO struct
4185  * @auth_probe: probe the auth flavours
4186  *
4187  * Returns zero on success, or a negative errno.
4188  */
nfs4_proc_get_rootfh(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,bool auth_probe)4189 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4190 			 struct nfs_fsinfo *info,
4191 			 bool auth_probe)
4192 {
4193 	int status = 0;
4194 
4195 	if (!auth_probe)
4196 		status = nfs4_lookup_root(server, fhandle, info);
4197 
4198 	if (auth_probe || status == NFS4ERR_WRONGSEC)
4199 		status = server->nfs_client->cl_mvops->find_root_sec(server,
4200 				fhandle, info);
4201 
4202 	if (status == 0)
4203 		status = nfs4_server_capabilities(server, fhandle);
4204 	if (status == 0)
4205 		status = nfs4_do_fsinfo(server, fhandle, info);
4206 
4207 	return nfs4_map_errors(status);
4208 }
4209 
nfs4_proc_get_root(struct nfs_server * server,struct nfs_fh * mntfh,struct nfs_fsinfo * info)4210 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4211 			      struct nfs_fsinfo *info)
4212 {
4213 	int error;
4214 	struct nfs_fattr *fattr = info->fattr;
4215 
4216 	error = nfs4_server_capabilities(server, mntfh);
4217 	if (error < 0) {
4218 		dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4219 		return error;
4220 	}
4221 
4222 	error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4223 	if (error < 0) {
4224 		dprintk("nfs4_get_root: getattr error = %d\n", -error);
4225 		goto out;
4226 	}
4227 
4228 	if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4229 	    !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4230 		memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4231 
4232 out:
4233 	return error;
4234 }
4235 
4236 /*
4237  * Get locations and (maybe) other attributes of a referral.
4238  * Note that we'll actually follow the referral later when
4239  * we detect fsid mismatch in inode revalidation
4240  */
nfs4_get_referral(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs_fattr * fattr,struct nfs_fh * fhandle)4241 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4242 			     const struct qstr *name, struct nfs_fattr *fattr,
4243 			     struct nfs_fh *fhandle)
4244 {
4245 	int status = -ENOMEM;
4246 	struct page *page = NULL;
4247 	struct nfs4_fs_locations *locations = NULL;
4248 
4249 	page = alloc_page(GFP_KERNEL);
4250 	if (page == NULL)
4251 		goto out;
4252 	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4253 	if (locations == NULL)
4254 		goto out;
4255 
4256 	locations->fattr = fattr;
4257 
4258 	status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4259 	if (status != 0)
4260 		goto out;
4261 
4262 	/*
4263 	 * If the fsid didn't change, this is a migration event, not a
4264 	 * referral.  Cause us to drop into the exception handler, which
4265 	 * will kick off migration recovery.
4266 	 */
4267 	if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4268 		dprintk("%s: server did not return a different fsid for"
4269 			" a referral at %s\n", __func__, name->name);
4270 		status = -NFS4ERR_MOVED;
4271 		goto out;
4272 	}
4273 	/* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4274 	nfs_fixup_referral_attributes(fattr);
4275 	memset(fhandle, 0, sizeof(struct nfs_fh));
4276 out:
4277 	if (page)
4278 		__free_page(page);
4279 	kfree(locations);
4280 	return status;
4281 }
4282 
_nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4283 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4284 				struct nfs_fattr *fattr, struct inode *inode)
4285 {
4286 	__u32 bitmask[NFS4_BITMASK_SZ];
4287 	struct nfs4_getattr_arg args = {
4288 		.fh = fhandle,
4289 		.bitmask = bitmask,
4290 	};
4291 	struct nfs4_getattr_res res = {
4292 		.fattr = fattr,
4293 		.server = server,
4294 	};
4295 	struct rpc_message msg = {
4296 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4297 		.rpc_argp = &args,
4298 		.rpc_resp = &res,
4299 	};
4300 	unsigned short task_flags = 0;
4301 
4302 	if (nfs4_has_session(server->nfs_client))
4303 		task_flags = RPC_TASK_MOVEABLE;
4304 
4305 	/* Is this is an attribute revalidation, subject to softreval? */
4306 	if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4307 		task_flags |= RPC_TASK_TIMEOUT;
4308 
4309 	nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4310 	nfs_fattr_init(fattr);
4311 	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4312 	return nfs4_do_call_sync(server->client, server, &msg,
4313 			&args.seq_args, &res.seq_res, task_flags);
4314 }
4315 
nfs4_proc_getattr(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fattr * fattr,struct inode * inode)4316 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4317 				struct nfs_fattr *fattr, struct inode *inode)
4318 {
4319 	struct nfs4_exception exception = {
4320 		.interruptible = true,
4321 	};
4322 	int err;
4323 	do {
4324 		err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4325 		trace_nfs4_getattr(server, fhandle, fattr, err);
4326 		err = nfs4_handle_exception(server, err,
4327 				&exception);
4328 	} while (exception.retry);
4329 	return err;
4330 }
4331 
4332 /*
4333  * The file is not closed if it is opened due to the a request to change
4334  * the size of the file. The open call will not be needed once the
4335  * VFS layer lookup-intents are implemented.
4336  *
4337  * Close is called when the inode is destroyed.
4338  * If we haven't opened the file for O_WRONLY, we
4339  * need to in the size_change case to obtain a stateid.
4340  *
4341  * Got race?
4342  * Because OPEN is always done by name in nfsv4, it is
4343  * possible that we opened a different file by the same
4344  * name.  We can recognize this race condition, but we
4345  * can't do anything about it besides returning an error.
4346  *
4347  * This will be fixed with VFS changes (lookup-intent).
4348  */
4349 static int
nfs4_proc_setattr(struct dentry * dentry,struct nfs_fattr * fattr,struct iattr * sattr)4350 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4351 		  struct iattr *sattr)
4352 {
4353 	struct inode *inode = d_inode(dentry);
4354 	const struct cred *cred = NULL;
4355 	struct nfs_open_context *ctx = NULL;
4356 	int status;
4357 
4358 	if (pnfs_ld_layoutret_on_setattr(inode) &&
4359 	    sattr->ia_valid & ATTR_SIZE &&
4360 	    sattr->ia_size < i_size_read(inode))
4361 		pnfs_commit_and_return_layout(inode);
4362 
4363 	nfs_fattr_init(fattr);
4364 
4365 	/* Deal with open(O_TRUNC) */
4366 	if (sattr->ia_valid & ATTR_OPEN)
4367 		sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4368 
4369 	/* Optimization: if the end result is no change, don't RPC */
4370 	if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4371 		return 0;
4372 
4373 	/* Search for an existing open(O_WRITE) file */
4374 	if (sattr->ia_valid & ATTR_FILE) {
4375 
4376 		ctx = nfs_file_open_context(sattr->ia_file);
4377 		if (ctx)
4378 			cred = ctx->cred;
4379 	}
4380 
4381 	/* Return any delegations if we're going to change ACLs */
4382 	if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4383 		nfs4_inode_make_writeable(inode);
4384 
4385 	status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4386 	if (status == 0) {
4387 		nfs_setattr_update_inode(inode, sattr, fattr);
4388 		nfs_setsecurity(inode, fattr);
4389 	}
4390 	return status;
4391 }
4392 
_nfs4_proc_lookup(struct rpc_clnt * clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4393 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4394 		struct dentry *dentry, struct nfs_fh *fhandle,
4395 		struct nfs_fattr *fattr)
4396 {
4397 	struct nfs_server *server = NFS_SERVER(dir);
4398 	int		       status;
4399 	struct nfs4_lookup_arg args = {
4400 		.bitmask = server->attr_bitmask,
4401 		.dir_fh = NFS_FH(dir),
4402 		.name = &dentry->d_name,
4403 	};
4404 	struct nfs4_lookup_res res = {
4405 		.server = server,
4406 		.fattr = fattr,
4407 		.fh = fhandle,
4408 	};
4409 	struct rpc_message msg = {
4410 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4411 		.rpc_argp = &args,
4412 		.rpc_resp = &res,
4413 	};
4414 	unsigned short task_flags = 0;
4415 
4416 	if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4417 		task_flags = RPC_TASK_MOVEABLE;
4418 
4419 	/* Is this is an attribute revalidation, subject to softreval? */
4420 	if (nfs_lookup_is_soft_revalidate(dentry))
4421 		task_flags |= RPC_TASK_TIMEOUT;
4422 
4423 	args.bitmask = nfs4_bitmask(server, fattr->label);
4424 
4425 	nfs_fattr_init(fattr);
4426 
4427 	dprintk("NFS call  lookup %pd2\n", dentry);
4428 	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4429 	status = nfs4_do_call_sync(clnt, server, &msg,
4430 			&args.seq_args, &res.seq_res, task_flags);
4431 	dprintk("NFS reply lookup: %d\n", status);
4432 	return status;
4433 }
4434 
nfs_fixup_secinfo_attributes(struct nfs_fattr * fattr)4435 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4436 {
4437 	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4438 		NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4439 	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4440 	fattr->nlink = 2;
4441 }
4442 
nfs4_proc_lookup_common(struct rpc_clnt ** clnt,struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4443 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4444 				   struct dentry *dentry, struct nfs_fh *fhandle,
4445 				   struct nfs_fattr *fattr)
4446 {
4447 	struct nfs4_exception exception = {
4448 		.interruptible = true,
4449 	};
4450 	struct rpc_clnt *client = *clnt;
4451 	const struct qstr *name = &dentry->d_name;
4452 	int err;
4453 	do {
4454 		err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4455 		trace_nfs4_lookup(dir, name, err);
4456 		switch (err) {
4457 		case -NFS4ERR_BADNAME:
4458 			err = -ENOENT;
4459 			goto out;
4460 		case -NFS4ERR_MOVED:
4461 			err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4462 			if (err == -NFS4ERR_MOVED)
4463 				err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4464 			goto out;
4465 		case -NFS4ERR_WRONGSEC:
4466 			err = -EPERM;
4467 			if (client != *clnt)
4468 				goto out;
4469 			client = nfs4_negotiate_security(client, dir, name);
4470 			if (IS_ERR(client))
4471 				return PTR_ERR(client);
4472 
4473 			exception.retry = 1;
4474 			break;
4475 		default:
4476 			err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4477 		}
4478 	} while (exception.retry);
4479 
4480 out:
4481 	if (err == 0)
4482 		*clnt = client;
4483 	else if (client != *clnt)
4484 		rpc_shutdown_client(client);
4485 
4486 	return err;
4487 }
4488 
nfs4_proc_lookup(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4489 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4490 			    struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4491 {
4492 	int status;
4493 	struct rpc_clnt *client = NFS_CLIENT(dir);
4494 
4495 	status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4496 	if (client != NFS_CLIENT(dir)) {
4497 		rpc_shutdown_client(client);
4498 		nfs_fixup_secinfo_attributes(fattr);
4499 	}
4500 	return status;
4501 }
4502 
4503 struct rpc_clnt *
nfs4_proc_lookup_mountpoint(struct inode * dir,struct dentry * dentry,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4504 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4505 			    struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4506 {
4507 	struct rpc_clnt *client = NFS_CLIENT(dir);
4508 	int status;
4509 
4510 	status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4511 	if (status < 0)
4512 		return ERR_PTR(status);
4513 	return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4514 }
4515 
_nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4516 static int _nfs4_proc_lookupp(struct inode *inode,
4517 		struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4518 {
4519 	struct rpc_clnt *clnt = NFS_CLIENT(inode);
4520 	struct nfs_server *server = NFS_SERVER(inode);
4521 	int		       status;
4522 	struct nfs4_lookupp_arg args = {
4523 		.bitmask = server->attr_bitmask,
4524 		.fh = NFS_FH(inode),
4525 	};
4526 	struct nfs4_lookupp_res res = {
4527 		.server = server,
4528 		.fattr = fattr,
4529 		.fh = fhandle,
4530 	};
4531 	struct rpc_message msg = {
4532 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4533 		.rpc_argp = &args,
4534 		.rpc_resp = &res,
4535 	};
4536 	unsigned short task_flags = 0;
4537 
4538 	if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4539 		task_flags |= RPC_TASK_TIMEOUT;
4540 
4541 	args.bitmask = nfs4_bitmask(server, fattr->label);
4542 
4543 	nfs_fattr_init(fattr);
4544 
4545 	dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4546 	status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4547 				&res.seq_res, task_flags);
4548 	dprintk("NFS reply lookupp: %d\n", status);
4549 	return status;
4550 }
4551 
nfs4_proc_lookupp(struct inode * inode,struct nfs_fh * fhandle,struct nfs_fattr * fattr)4552 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4553 			     struct nfs_fattr *fattr)
4554 {
4555 	struct nfs4_exception exception = {
4556 		.interruptible = true,
4557 	};
4558 	int err;
4559 	do {
4560 		err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4561 		trace_nfs4_lookupp(inode, err);
4562 		err = nfs4_handle_exception(NFS_SERVER(inode), err,
4563 				&exception);
4564 	} while (exception.retry);
4565 	return err;
4566 }
4567 
_nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4568 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4569 			     const struct cred *cred)
4570 {
4571 	struct nfs_server *server = NFS_SERVER(inode);
4572 	struct nfs4_accessargs args = {
4573 		.fh = NFS_FH(inode),
4574 		.access = entry->mask,
4575 	};
4576 	struct nfs4_accessres res = {
4577 		.server = server,
4578 	};
4579 	struct rpc_message msg = {
4580 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4581 		.rpc_argp = &args,
4582 		.rpc_resp = &res,
4583 		.rpc_cred = cred,
4584 	};
4585 	int status = 0;
4586 
4587 	if (!nfs4_have_delegation(inode, FMODE_READ)) {
4588 		res.fattr = nfs_alloc_fattr();
4589 		if (res.fattr == NULL)
4590 			return -ENOMEM;
4591 		args.bitmask = server->cache_consistency_bitmask;
4592 	}
4593 	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4594 	if (!status) {
4595 		nfs_access_set_mask(entry, res.access);
4596 		if (res.fattr)
4597 			nfs_refresh_inode(inode, res.fattr);
4598 	}
4599 	nfs_free_fattr(res.fattr);
4600 	return status;
4601 }
4602 
nfs4_proc_access(struct inode * inode,struct nfs_access_entry * entry,const struct cred * cred)4603 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4604 			    const struct cred *cred)
4605 {
4606 	struct nfs4_exception exception = {
4607 		.interruptible = true,
4608 	};
4609 	int err;
4610 	do {
4611 		err = _nfs4_proc_access(inode, entry, cred);
4612 		trace_nfs4_access(inode, err);
4613 		err = nfs4_handle_exception(NFS_SERVER(inode), err,
4614 				&exception);
4615 	} while (exception.retry);
4616 	return err;
4617 }
4618 
4619 /*
4620  * TODO: For the time being, we don't try to get any attributes
4621  * along with any of the zero-copy operations READ, READDIR,
4622  * READLINK, WRITE.
4623  *
4624  * In the case of the first three, we want to put the GETATTR
4625  * after the read-type operation -- this is because it is hard
4626  * to predict the length of a GETATTR response in v4, and thus
4627  * align the READ data correctly.  This means that the GETATTR
4628  * may end up partially falling into the page cache, and we should
4629  * shift it into the 'tail' of the xdr_buf before processing.
4630  * To do this efficiently, we need to know the total length
4631  * of data received, which doesn't seem to be available outside
4632  * of the RPC layer.
4633  *
4634  * In the case of WRITE, we also want to put the GETATTR after
4635  * the operation -- in this case because we want to make sure
4636  * we get the post-operation mtime and size.
4637  *
4638  * Both of these changes to the XDR layer would in fact be quite
4639  * minor, but I decided to leave them for a subsequent patch.
4640  */
_nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4641 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4642 		unsigned int pgbase, unsigned int pglen)
4643 {
4644 	struct nfs4_readlink args = {
4645 		.fh       = NFS_FH(inode),
4646 		.pgbase	  = pgbase,
4647 		.pglen    = pglen,
4648 		.pages    = &page,
4649 	};
4650 	struct nfs4_readlink_res res;
4651 	struct rpc_message msg = {
4652 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4653 		.rpc_argp = &args,
4654 		.rpc_resp = &res,
4655 	};
4656 
4657 	return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4658 }
4659 
nfs4_proc_readlink(struct inode * inode,struct page * page,unsigned int pgbase,unsigned int pglen)4660 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4661 		unsigned int pgbase, unsigned int pglen)
4662 {
4663 	struct nfs4_exception exception = {
4664 		.interruptible = true,
4665 	};
4666 	int err;
4667 	do {
4668 		err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4669 		trace_nfs4_readlink(inode, err);
4670 		err = nfs4_handle_exception(NFS_SERVER(inode), err,
4671 				&exception);
4672 	} while (exception.retry);
4673 	return err;
4674 }
4675 
4676 /*
4677  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4678  */
4679 static int
nfs4_proc_create(struct inode * dir,struct dentry * dentry,struct iattr * sattr,int flags)4680 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4681 		 int flags)
4682 {
4683 	struct nfs_server *server = NFS_SERVER(dir);
4684 	struct nfs4_label l, *ilabel = NULL;
4685 	struct nfs_open_context *ctx;
4686 	struct nfs4_state *state;
4687 	int status = 0;
4688 
4689 	ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4690 	if (IS_ERR(ctx))
4691 		return PTR_ERR(ctx);
4692 
4693 	ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4694 
4695 	if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4696 		sattr->ia_mode &= ~current_umask();
4697 	state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4698 	if (IS_ERR(state)) {
4699 		status = PTR_ERR(state);
4700 		goto out;
4701 	}
4702 out:
4703 	nfs4_label_release_security(ilabel);
4704 	put_nfs_open_context(ctx);
4705 	return status;
4706 }
4707 
4708 static int
_nfs4_proc_remove(struct inode * dir,const struct qstr * name,u32 ftype)4709 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4710 {
4711 	struct nfs_server *server = NFS_SERVER(dir);
4712 	struct nfs_removeargs args = {
4713 		.fh = NFS_FH(dir),
4714 		.name = *name,
4715 	};
4716 	struct nfs_removeres res = {
4717 		.server = server,
4718 	};
4719 	struct rpc_message msg = {
4720 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4721 		.rpc_argp = &args,
4722 		.rpc_resp = &res,
4723 	};
4724 	unsigned long timestamp = jiffies;
4725 	int status;
4726 
4727 	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4728 	if (status == 0) {
4729 		spin_lock(&dir->i_lock);
4730 		/* Removing a directory decrements nlink in the parent */
4731 		if (ftype == NF4DIR && dir->i_nlink > 2)
4732 			nfs4_dec_nlink_locked(dir);
4733 		nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4734 					      NFS_INO_INVALID_DATA);
4735 		spin_unlock(&dir->i_lock);
4736 	}
4737 	return status;
4738 }
4739 
nfs4_proc_remove(struct inode * dir,struct dentry * dentry)4740 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4741 {
4742 	struct nfs4_exception exception = {
4743 		.interruptible = true,
4744 	};
4745 	struct inode *inode = d_inode(dentry);
4746 	int err;
4747 
4748 	if (inode) {
4749 		if (inode->i_nlink == 1)
4750 			nfs4_inode_return_delegation(inode);
4751 		else
4752 			nfs4_inode_make_writeable(inode);
4753 	}
4754 	do {
4755 		err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4756 		trace_nfs4_remove(dir, &dentry->d_name, err);
4757 		err = nfs4_handle_exception(NFS_SERVER(dir), err,
4758 				&exception);
4759 	} while (exception.retry);
4760 	return err;
4761 }
4762 
nfs4_proc_rmdir(struct inode * dir,const struct qstr * name)4763 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4764 {
4765 	struct nfs4_exception exception = {
4766 		.interruptible = true,
4767 	};
4768 	int err;
4769 
4770 	do {
4771 		err = _nfs4_proc_remove(dir, name, NF4DIR);
4772 		trace_nfs4_remove(dir, name, err);
4773 		err = nfs4_handle_exception(NFS_SERVER(dir), err,
4774 				&exception);
4775 	} while (exception.retry);
4776 	return err;
4777 }
4778 
nfs4_proc_unlink_setup(struct rpc_message * msg,struct dentry * dentry,struct inode * inode)4779 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4780 		struct dentry *dentry,
4781 		struct inode *inode)
4782 {
4783 	struct nfs_removeargs *args = msg->rpc_argp;
4784 	struct nfs_removeres *res = msg->rpc_resp;
4785 
4786 	res->server = NFS_SB(dentry->d_sb);
4787 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4788 	nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4789 
4790 	nfs_fattr_init(res->dir_attr);
4791 
4792 	if (inode) {
4793 		nfs4_inode_return_delegation(inode);
4794 		nfs_d_prune_case_insensitive_aliases(inode);
4795 	}
4796 }
4797 
nfs4_proc_unlink_rpc_prepare(struct rpc_task * task,struct nfs_unlinkdata * data)4798 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4799 {
4800 	nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4801 			&data->args.seq_args,
4802 			&data->res.seq_res,
4803 			task);
4804 }
4805 
nfs4_proc_unlink_done(struct rpc_task * task,struct inode * dir)4806 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4807 {
4808 	struct nfs_unlinkdata *data = task->tk_calldata;
4809 	struct nfs_removeres *res = &data->res;
4810 
4811 	if (!nfs4_sequence_done(task, &res->seq_res))
4812 		return 0;
4813 	if (nfs4_async_handle_error(task, res->server, NULL,
4814 				    &data->timeout) == -EAGAIN)
4815 		return 0;
4816 	if (task->tk_status == 0)
4817 		nfs4_update_changeattr(dir, &res->cinfo,
4818 				res->dir_attr->time_start,
4819 				NFS_INO_INVALID_DATA);
4820 	return 1;
4821 }
4822 
nfs4_proc_rename_setup(struct rpc_message * msg,struct dentry * old_dentry,struct dentry * new_dentry)4823 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4824 		struct dentry *old_dentry,
4825 		struct dentry *new_dentry)
4826 {
4827 	struct nfs_renameargs *arg = msg->rpc_argp;
4828 	struct nfs_renameres *res = msg->rpc_resp;
4829 	struct inode *old_inode = d_inode(old_dentry);
4830 	struct inode *new_inode = d_inode(new_dentry);
4831 
4832 	if (old_inode)
4833 		nfs4_inode_make_writeable(old_inode);
4834 	if (new_inode)
4835 		nfs4_inode_return_delegation(new_inode);
4836 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4837 	res->server = NFS_SB(old_dentry->d_sb);
4838 	nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4839 }
4840 
nfs4_proc_rename_rpc_prepare(struct rpc_task * task,struct nfs_renamedata * data)4841 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4842 {
4843 	nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4844 			&data->args.seq_args,
4845 			&data->res.seq_res,
4846 			task);
4847 }
4848 
nfs4_proc_rename_done(struct rpc_task * task,struct inode * old_dir,struct inode * new_dir)4849 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4850 				 struct inode *new_dir)
4851 {
4852 	struct nfs_renamedata *data = task->tk_calldata;
4853 	struct nfs_renameres *res = &data->res;
4854 
4855 	if (!nfs4_sequence_done(task, &res->seq_res))
4856 		return 0;
4857 	if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4858 		return 0;
4859 
4860 	if (task->tk_status == 0) {
4861 		nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4862 		if (new_dir != old_dir) {
4863 			/* Note: If we moved a directory, nlink will change */
4864 			nfs4_update_changeattr(old_dir, &res->old_cinfo,
4865 					res->old_fattr->time_start,
4866 					NFS_INO_INVALID_NLINK |
4867 					    NFS_INO_INVALID_DATA);
4868 			nfs4_update_changeattr(new_dir, &res->new_cinfo,
4869 					res->new_fattr->time_start,
4870 					NFS_INO_INVALID_NLINK |
4871 					    NFS_INO_INVALID_DATA);
4872 		} else
4873 			nfs4_update_changeattr(old_dir, &res->old_cinfo,
4874 					res->old_fattr->time_start,
4875 					NFS_INO_INVALID_DATA);
4876 	}
4877 	return 1;
4878 }
4879 
_nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)4880 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4881 {
4882 	struct nfs_server *server = NFS_SERVER(inode);
4883 	__u32 bitmask[NFS4_BITMASK_SZ];
4884 	struct nfs4_link_arg arg = {
4885 		.fh     = NFS_FH(inode),
4886 		.dir_fh = NFS_FH(dir),
4887 		.name   = name,
4888 		.bitmask = bitmask,
4889 	};
4890 	struct nfs4_link_res res = {
4891 		.server = server,
4892 	};
4893 	struct rpc_message msg = {
4894 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4895 		.rpc_argp = &arg,
4896 		.rpc_resp = &res,
4897 	};
4898 	int status = -ENOMEM;
4899 
4900 	res.fattr = nfs_alloc_fattr_with_label(server);
4901 	if (res.fattr == NULL)
4902 		goto out;
4903 
4904 	nfs4_inode_make_writeable(inode);
4905 	nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4906 				NFS_INO_INVALID_CHANGE);
4907 	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4908 	if (!status) {
4909 		nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4910 				       NFS_INO_INVALID_DATA);
4911 		nfs4_inc_nlink(inode);
4912 		status = nfs_post_op_update_inode(inode, res.fattr);
4913 		if (!status)
4914 			nfs_setsecurity(inode, res.fattr);
4915 	}
4916 
4917 out:
4918 	nfs_free_fattr(res.fattr);
4919 	return status;
4920 }
4921 
nfs4_proc_link(struct inode * inode,struct inode * dir,const struct qstr * name)4922 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4923 {
4924 	struct nfs4_exception exception = {
4925 		.interruptible = true,
4926 	};
4927 	int err;
4928 	do {
4929 		err = nfs4_handle_exception(NFS_SERVER(inode),
4930 				_nfs4_proc_link(inode, dir, name),
4931 				&exception);
4932 	} while (exception.retry);
4933 	return err;
4934 }
4935 
4936 struct nfs4_createdata {
4937 	struct rpc_message msg;
4938 	struct nfs4_create_arg arg;
4939 	struct nfs4_create_res res;
4940 	struct nfs_fh fh;
4941 	struct nfs_fattr fattr;
4942 };
4943 
nfs4_alloc_createdata(struct inode * dir,const struct qstr * name,struct iattr * sattr,u32 ftype)4944 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4945 		const struct qstr *name, struct iattr *sattr, u32 ftype)
4946 {
4947 	struct nfs4_createdata *data;
4948 
4949 	data = kzalloc(sizeof(*data), GFP_KERNEL);
4950 	if (data != NULL) {
4951 		struct nfs_server *server = NFS_SERVER(dir);
4952 
4953 		data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4954 		if (IS_ERR(data->fattr.label))
4955 			goto out_free;
4956 
4957 		data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4958 		data->msg.rpc_argp = &data->arg;
4959 		data->msg.rpc_resp = &data->res;
4960 		data->arg.dir_fh = NFS_FH(dir);
4961 		data->arg.server = server;
4962 		data->arg.name = name;
4963 		data->arg.attrs = sattr;
4964 		data->arg.ftype = ftype;
4965 		data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
4966 		data->arg.umask = current_umask();
4967 		data->res.server = server;
4968 		data->res.fh = &data->fh;
4969 		data->res.fattr = &data->fattr;
4970 		nfs_fattr_init(data->res.fattr);
4971 	}
4972 	return data;
4973 out_free:
4974 	kfree(data);
4975 	return NULL;
4976 }
4977 
nfs4_do_create(struct inode * dir,struct dentry * dentry,struct nfs4_createdata * data)4978 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4979 {
4980 	int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4981 				    &data->arg.seq_args, &data->res.seq_res, 1);
4982 	if (status == 0) {
4983 		spin_lock(&dir->i_lock);
4984 		/* Creating a directory bumps nlink in the parent */
4985 		if (data->arg.ftype == NF4DIR)
4986 			nfs4_inc_nlink_locked(dir);
4987 		nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
4988 					      data->res.fattr->time_start,
4989 					      NFS_INO_INVALID_DATA);
4990 		spin_unlock(&dir->i_lock);
4991 		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
4992 	}
4993 	return status;
4994 }
4995 
nfs4_free_createdata(struct nfs4_createdata * data)4996 static void nfs4_free_createdata(struct nfs4_createdata *data)
4997 {
4998 	nfs4_label_free(data->fattr.label);
4999 	kfree(data);
5000 }
5001 
_nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct page * page,unsigned int len,struct iattr * sattr,struct nfs4_label * label)5002 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5003 		struct page *page, unsigned int len, struct iattr *sattr,
5004 		struct nfs4_label *label)
5005 {
5006 	struct nfs4_createdata *data;
5007 	int status = -ENAMETOOLONG;
5008 
5009 	if (len > NFS4_MAXPATHLEN)
5010 		goto out;
5011 
5012 	status = -ENOMEM;
5013 	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5014 	if (data == NULL)
5015 		goto out;
5016 
5017 	data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5018 	data->arg.u.symlink.pages = &page;
5019 	data->arg.u.symlink.len = len;
5020 	data->arg.label = label;
5021 
5022 	status = nfs4_do_create(dir, dentry, data);
5023 
5024 	nfs4_free_createdata(data);
5025 out:
5026 	return status;
5027 }
5028 
nfs4_proc_symlink(struct inode * dir,struct dentry * dentry,struct page * page,unsigned int len,struct iattr * sattr)5029 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5030 		struct page *page, unsigned int len, struct iattr *sattr)
5031 {
5032 	struct nfs4_exception exception = {
5033 		.interruptible = true,
5034 	};
5035 	struct nfs4_label l, *label = NULL;
5036 	int err;
5037 
5038 	label = nfs4_label_init_security(dir, dentry, sattr, &l);
5039 
5040 	do {
5041 		err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5042 		trace_nfs4_symlink(dir, &dentry->d_name, err);
5043 		err = nfs4_handle_exception(NFS_SERVER(dir), err,
5044 				&exception);
5045 	} while (exception.retry);
5046 
5047 	nfs4_label_release_security(label);
5048 	return err;
5049 }
5050 
_nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label)5051 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5052 		struct iattr *sattr, struct nfs4_label *label)
5053 {
5054 	struct nfs4_createdata *data;
5055 	int status = -ENOMEM;
5056 
5057 	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5058 	if (data == NULL)
5059 		goto out;
5060 
5061 	data->arg.label = label;
5062 	status = nfs4_do_create(dir, dentry, data);
5063 
5064 	nfs4_free_createdata(data);
5065 out:
5066 	return status;
5067 }
5068 
nfs4_proc_mkdir(struct inode * dir,struct dentry * dentry,struct iattr * sattr)5069 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5070 		struct iattr *sattr)
5071 {
5072 	struct nfs_server *server = NFS_SERVER(dir);
5073 	struct nfs4_exception exception = {
5074 		.interruptible = true,
5075 	};
5076 	struct nfs4_label l, *label = NULL;
5077 	int err;
5078 
5079 	label = nfs4_label_init_security(dir, dentry, sattr, &l);
5080 
5081 	if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5082 		sattr->ia_mode &= ~current_umask();
5083 	do {
5084 		err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5085 		trace_nfs4_mkdir(dir, &dentry->d_name, err);
5086 		err = nfs4_handle_exception(NFS_SERVER(dir), err,
5087 				&exception);
5088 	} while (exception.retry);
5089 	nfs4_label_release_security(label);
5090 
5091 	return err;
5092 }
5093 
_nfs4_proc_readdir(struct nfs_readdir_arg * nr_arg,struct nfs_readdir_res * nr_res)5094 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5095 			      struct nfs_readdir_res *nr_res)
5096 {
5097 	struct inode		*dir = d_inode(nr_arg->dentry);
5098 	struct nfs_server	*server = NFS_SERVER(dir);
5099 	struct nfs4_readdir_arg args = {
5100 		.fh = NFS_FH(dir),
5101 		.pages = nr_arg->pages,
5102 		.pgbase = 0,
5103 		.count = nr_arg->page_len,
5104 		.plus = nr_arg->plus,
5105 	};
5106 	struct nfs4_readdir_res res;
5107 	struct rpc_message msg = {
5108 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5109 		.rpc_argp = &args,
5110 		.rpc_resp = &res,
5111 		.rpc_cred = nr_arg->cred,
5112 	};
5113 	int			status;
5114 
5115 	dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5116 		nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5117 	if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5118 		args.bitmask = server->attr_bitmask_nl;
5119 	else
5120 		args.bitmask = server->attr_bitmask;
5121 
5122 	nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5123 	res.pgbase = args.pgbase;
5124 	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5125 			&res.seq_res, 0);
5126 	if (status >= 0) {
5127 		memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5128 		status += args.pgbase;
5129 	}
5130 
5131 	nfs_invalidate_atime(dir);
5132 
5133 	dprintk("%s: returns %d\n", __func__, status);
5134 	return status;
5135 }
5136 
nfs4_proc_readdir(struct nfs_readdir_arg * arg,struct nfs_readdir_res * res)5137 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5138 			     struct nfs_readdir_res *res)
5139 {
5140 	struct nfs4_exception exception = {
5141 		.interruptible = true,
5142 	};
5143 	int err;
5144 	do {
5145 		err = _nfs4_proc_readdir(arg, res);
5146 		trace_nfs4_readdir(d_inode(arg->dentry), err);
5147 		err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5148 					    err, &exception);
5149 	} while (exception.retry);
5150 	return err;
5151 }
5152 
_nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,struct nfs4_label * label,dev_t rdev)5153 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5154 		struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5155 {
5156 	struct nfs4_createdata *data;
5157 	int mode = sattr->ia_mode;
5158 	int status = -ENOMEM;
5159 
5160 	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5161 	if (data == NULL)
5162 		goto out;
5163 
5164 	if (S_ISFIFO(mode))
5165 		data->arg.ftype = NF4FIFO;
5166 	else if (S_ISBLK(mode)) {
5167 		data->arg.ftype = NF4BLK;
5168 		data->arg.u.device.specdata1 = MAJOR(rdev);
5169 		data->arg.u.device.specdata2 = MINOR(rdev);
5170 	}
5171 	else if (S_ISCHR(mode)) {
5172 		data->arg.ftype = NF4CHR;
5173 		data->arg.u.device.specdata1 = MAJOR(rdev);
5174 		data->arg.u.device.specdata2 = MINOR(rdev);
5175 	} else if (!S_ISSOCK(mode)) {
5176 		status = -EINVAL;
5177 		goto out_free;
5178 	}
5179 
5180 	data->arg.label = label;
5181 	status = nfs4_do_create(dir, dentry, data);
5182 out_free:
5183 	nfs4_free_createdata(data);
5184 out:
5185 	return status;
5186 }
5187 
nfs4_proc_mknod(struct inode * dir,struct dentry * dentry,struct iattr * sattr,dev_t rdev)5188 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5189 		struct iattr *sattr, dev_t rdev)
5190 {
5191 	struct nfs_server *server = NFS_SERVER(dir);
5192 	struct nfs4_exception exception = {
5193 		.interruptible = true,
5194 	};
5195 	struct nfs4_label l, *label = NULL;
5196 	int err;
5197 
5198 	label = nfs4_label_init_security(dir, dentry, sattr, &l);
5199 
5200 	if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5201 		sattr->ia_mode &= ~current_umask();
5202 	do {
5203 		err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5204 		trace_nfs4_mknod(dir, &dentry->d_name, err);
5205 		err = nfs4_handle_exception(NFS_SERVER(dir), err,
5206 				&exception);
5207 	} while (exception.retry);
5208 
5209 	nfs4_label_release_security(label);
5210 
5211 	return err;
5212 }
5213 
_nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5214 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5215 		 struct nfs_fsstat *fsstat)
5216 {
5217 	struct nfs4_statfs_arg args = {
5218 		.fh = fhandle,
5219 		.bitmask = server->attr_bitmask,
5220 	};
5221 	struct nfs4_statfs_res res = {
5222 		.fsstat = fsstat,
5223 	};
5224 	struct rpc_message msg = {
5225 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5226 		.rpc_argp = &args,
5227 		.rpc_resp = &res,
5228 	};
5229 
5230 	nfs_fattr_init(fsstat->fattr);
5231 	return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5232 }
5233 
nfs4_proc_statfs(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsstat * fsstat)5234 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5235 {
5236 	struct nfs4_exception exception = {
5237 		.interruptible = true,
5238 	};
5239 	int err;
5240 	do {
5241 		err = nfs4_handle_exception(server,
5242 				_nfs4_proc_statfs(server, fhandle, fsstat),
5243 				&exception);
5244 	} while (exception.retry);
5245 	return err;
5246 }
5247 
_nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5248 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5249 		struct nfs_fsinfo *fsinfo)
5250 {
5251 	struct nfs4_fsinfo_arg args = {
5252 		.fh = fhandle,
5253 		.bitmask = server->attr_bitmask,
5254 	};
5255 	struct nfs4_fsinfo_res res = {
5256 		.fsinfo = fsinfo,
5257 	};
5258 	struct rpc_message msg = {
5259 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5260 		.rpc_argp = &args,
5261 		.rpc_resp = &res,
5262 	};
5263 
5264 	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5265 }
5266 
nfs4_do_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5267 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5268 {
5269 	struct nfs4_exception exception = {
5270 		.interruptible = true,
5271 	};
5272 	int err;
5273 
5274 	do {
5275 		err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5276 		trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5277 		if (err == 0) {
5278 			nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5279 			break;
5280 		}
5281 		err = nfs4_handle_exception(server, err, &exception);
5282 	} while (exception.retry);
5283 	return err;
5284 }
5285 
nfs4_proc_fsinfo(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * fsinfo)5286 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5287 {
5288 	int error;
5289 
5290 	nfs_fattr_init(fsinfo->fattr);
5291 	error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5292 	if (error == 0) {
5293 		/* block layout checks this! */
5294 		server->pnfs_blksize = fsinfo->blksize;
5295 		set_pnfs_layoutdriver(server, fhandle, fsinfo);
5296 	}
5297 
5298 	return error;
5299 }
5300 
_nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5301 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5302 		struct nfs_pathconf *pathconf)
5303 {
5304 	struct nfs4_pathconf_arg args = {
5305 		.fh = fhandle,
5306 		.bitmask = server->attr_bitmask,
5307 	};
5308 	struct nfs4_pathconf_res res = {
5309 		.pathconf = pathconf,
5310 	};
5311 	struct rpc_message msg = {
5312 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5313 		.rpc_argp = &args,
5314 		.rpc_resp = &res,
5315 	};
5316 
5317 	/* None of the pathconf attributes are mandatory to implement */
5318 	if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5319 		memset(pathconf, 0, sizeof(*pathconf));
5320 		return 0;
5321 	}
5322 
5323 	nfs_fattr_init(pathconf->fattr);
5324 	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5325 }
5326 
nfs4_proc_pathconf(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_pathconf * pathconf)5327 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5328 		struct nfs_pathconf *pathconf)
5329 {
5330 	struct nfs4_exception exception = {
5331 		.interruptible = true,
5332 	};
5333 	int err;
5334 
5335 	do {
5336 		err = nfs4_handle_exception(server,
5337 				_nfs4_proc_pathconf(server, fhandle, pathconf),
5338 				&exception);
5339 	} while (exception.retry);
5340 	return err;
5341 }
5342 
nfs4_set_rw_stateid(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5343 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5344 		const struct nfs_open_context *ctx,
5345 		const struct nfs_lock_context *l_ctx,
5346 		fmode_t fmode)
5347 {
5348 	return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5349 }
5350 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5351 
nfs4_stateid_is_current(nfs4_stateid * stateid,const struct nfs_open_context * ctx,const struct nfs_lock_context * l_ctx,fmode_t fmode)5352 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5353 		const struct nfs_open_context *ctx,
5354 		const struct nfs_lock_context *l_ctx,
5355 		fmode_t fmode)
5356 {
5357 	nfs4_stateid _current_stateid;
5358 
5359 	/* If the current stateid represents a lost lock, then exit */
5360 	if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5361 		return true;
5362 	return nfs4_stateid_match(stateid, &_current_stateid);
5363 }
5364 
nfs4_error_stateid_expired(int err)5365 static bool nfs4_error_stateid_expired(int err)
5366 {
5367 	switch (err) {
5368 	case -NFS4ERR_DELEG_REVOKED:
5369 	case -NFS4ERR_ADMIN_REVOKED:
5370 	case -NFS4ERR_BAD_STATEID:
5371 	case -NFS4ERR_STALE_STATEID:
5372 	case -NFS4ERR_OLD_STATEID:
5373 	case -NFS4ERR_OPENMODE:
5374 	case -NFS4ERR_EXPIRED:
5375 		return true;
5376 	}
5377 	return false;
5378 }
5379 
nfs4_read_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5380 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5381 {
5382 	struct nfs_server *server = NFS_SERVER(hdr->inode);
5383 
5384 	trace_nfs4_read(hdr, task->tk_status);
5385 	if (task->tk_status < 0) {
5386 		struct nfs4_exception exception = {
5387 			.inode = hdr->inode,
5388 			.state = hdr->args.context->state,
5389 			.stateid = &hdr->args.stateid,
5390 		};
5391 		task->tk_status = nfs4_async_handle_exception(task,
5392 				server, task->tk_status, &exception);
5393 		if (exception.retry) {
5394 			rpc_restart_call_prepare(task);
5395 			return -EAGAIN;
5396 		}
5397 	}
5398 
5399 	if (task->tk_status > 0)
5400 		renew_lease(server, hdr->timestamp);
5401 	return 0;
5402 }
5403 
nfs4_read_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5404 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5405 		struct nfs_pgio_args *args)
5406 {
5407 
5408 	if (!nfs4_error_stateid_expired(task->tk_status) ||
5409 		nfs4_stateid_is_current(&args->stateid,
5410 				args->context,
5411 				args->lock_context,
5412 				FMODE_READ))
5413 		return false;
5414 	rpc_restart_call_prepare(task);
5415 	return true;
5416 }
5417 
nfs4_read_plus_not_supported(struct rpc_task * task,struct nfs_pgio_header * hdr)5418 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5419 					 struct nfs_pgio_header *hdr)
5420 {
5421 	struct nfs_server *server = NFS_SERVER(hdr->inode);
5422 	struct rpc_message *msg = &task->tk_msg;
5423 
5424 	if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5425 	    server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5426 		server->caps &= ~NFS_CAP_READ_PLUS;
5427 		msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5428 		rpc_restart_call_prepare(task);
5429 		return true;
5430 	}
5431 	return false;
5432 }
5433 
nfs4_read_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5434 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5435 {
5436 	if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5437 		return -EAGAIN;
5438 	if (nfs4_read_stateid_changed(task, &hdr->args))
5439 		return -EAGAIN;
5440 	if (nfs4_read_plus_not_supported(task, hdr))
5441 		return -EAGAIN;
5442 	if (task->tk_status > 0)
5443 		nfs_invalidate_atime(hdr->inode);
5444 	return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5445 				    nfs4_read_done_cb(task, hdr);
5446 }
5447 
5448 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5449 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5450 				    struct rpc_message *msg)
5451 {
5452 	/* Note: We don't use READ_PLUS with pNFS yet */
5453 	if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp)
5454 		msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5455 }
5456 #else
nfs42_read_plus_support(struct nfs_pgio_header * hdr,struct rpc_message * msg)5457 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5458 				    struct rpc_message *msg)
5459 {
5460 }
5461 #endif /* CONFIG_NFS_V4_2 */
5462 
nfs4_proc_read_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg)5463 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5464 				 struct rpc_message *msg)
5465 {
5466 	hdr->timestamp   = jiffies;
5467 	if (!hdr->pgio_done_cb)
5468 		hdr->pgio_done_cb = nfs4_read_done_cb;
5469 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5470 	nfs42_read_plus_support(hdr, msg);
5471 	nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5472 }
5473 
nfs4_proc_pgio_rpc_prepare(struct rpc_task * task,struct nfs_pgio_header * hdr)5474 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5475 				      struct nfs_pgio_header *hdr)
5476 {
5477 	if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5478 			&hdr->args.seq_args,
5479 			&hdr->res.seq_res,
5480 			task))
5481 		return 0;
5482 	if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5483 				hdr->args.lock_context,
5484 				hdr->rw_mode) == -EIO)
5485 		return -EIO;
5486 	if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5487 		return -EIO;
5488 	return 0;
5489 }
5490 
nfs4_write_done_cb(struct rpc_task * task,struct nfs_pgio_header * hdr)5491 static int nfs4_write_done_cb(struct rpc_task *task,
5492 			      struct nfs_pgio_header *hdr)
5493 {
5494 	struct inode *inode = hdr->inode;
5495 
5496 	trace_nfs4_write(hdr, task->tk_status);
5497 	if (task->tk_status < 0) {
5498 		struct nfs4_exception exception = {
5499 			.inode = hdr->inode,
5500 			.state = hdr->args.context->state,
5501 			.stateid = &hdr->args.stateid,
5502 		};
5503 		task->tk_status = nfs4_async_handle_exception(task,
5504 				NFS_SERVER(inode), task->tk_status,
5505 				&exception);
5506 		if (exception.retry) {
5507 			rpc_restart_call_prepare(task);
5508 			return -EAGAIN;
5509 		}
5510 	}
5511 	if (task->tk_status >= 0) {
5512 		renew_lease(NFS_SERVER(inode), hdr->timestamp);
5513 		nfs_writeback_update_inode(hdr);
5514 	}
5515 	return 0;
5516 }
5517 
nfs4_write_stateid_changed(struct rpc_task * task,struct nfs_pgio_args * args)5518 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5519 		struct nfs_pgio_args *args)
5520 {
5521 
5522 	if (!nfs4_error_stateid_expired(task->tk_status) ||
5523 		nfs4_stateid_is_current(&args->stateid,
5524 				args->context,
5525 				args->lock_context,
5526 				FMODE_WRITE))
5527 		return false;
5528 	rpc_restart_call_prepare(task);
5529 	return true;
5530 }
5531 
nfs4_write_done(struct rpc_task * task,struct nfs_pgio_header * hdr)5532 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5533 {
5534 	if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5535 		return -EAGAIN;
5536 	if (nfs4_write_stateid_changed(task, &hdr->args))
5537 		return -EAGAIN;
5538 	return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5539 		nfs4_write_done_cb(task, hdr);
5540 }
5541 
5542 static
nfs4_write_need_cache_consistency_data(struct nfs_pgio_header * hdr)5543 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5544 {
5545 	/* Don't request attributes for pNFS or O_DIRECT writes */
5546 	if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5547 		return false;
5548 	/* Otherwise, request attributes if and only if we don't hold
5549 	 * a delegation
5550 	 */
5551 	return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5552 }
5553 
nfs4_bitmask_set(__u32 bitmask[],const __u32 src[],struct inode * inode,unsigned long cache_validity)5554 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5555 		      struct inode *inode, unsigned long cache_validity)
5556 {
5557 	struct nfs_server *server = NFS_SERVER(inode);
5558 	unsigned int i;
5559 
5560 	memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5561 	cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5562 
5563 	if (cache_validity & NFS_INO_INVALID_CHANGE)
5564 		bitmask[0] |= FATTR4_WORD0_CHANGE;
5565 	if (cache_validity & NFS_INO_INVALID_ATIME)
5566 		bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5567 	if (cache_validity & NFS_INO_INVALID_MODE)
5568 		bitmask[1] |= FATTR4_WORD1_MODE;
5569 	if (cache_validity & NFS_INO_INVALID_OTHER)
5570 		bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5571 	if (cache_validity & NFS_INO_INVALID_NLINK)
5572 		bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5573 	if (cache_validity & NFS_INO_INVALID_CTIME)
5574 		bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5575 	if (cache_validity & NFS_INO_INVALID_MTIME)
5576 		bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5577 	if (cache_validity & NFS_INO_INVALID_BLOCKS)
5578 		bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5579 
5580 	if (cache_validity & NFS_INO_INVALID_SIZE)
5581 		bitmask[0] |= FATTR4_WORD0_SIZE;
5582 
5583 	for (i = 0; i < NFS4_BITMASK_SZ; i++)
5584 		bitmask[i] &= server->attr_bitmask[i];
5585 }
5586 
nfs4_proc_write_setup(struct nfs_pgio_header * hdr,struct rpc_message * msg,struct rpc_clnt ** clnt)5587 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5588 				  struct rpc_message *msg,
5589 				  struct rpc_clnt **clnt)
5590 {
5591 	struct nfs_server *server = NFS_SERVER(hdr->inode);
5592 
5593 	if (!nfs4_write_need_cache_consistency_data(hdr)) {
5594 		hdr->args.bitmask = NULL;
5595 		hdr->res.fattr = NULL;
5596 	} else {
5597 		nfs4_bitmask_set(hdr->args.bitmask_store,
5598 				 server->cache_consistency_bitmask,
5599 				 hdr->inode, NFS_INO_INVALID_BLOCKS);
5600 		hdr->args.bitmask = hdr->args.bitmask_store;
5601 	}
5602 
5603 	if (!hdr->pgio_done_cb)
5604 		hdr->pgio_done_cb = nfs4_write_done_cb;
5605 	hdr->res.server = server;
5606 	hdr->timestamp   = jiffies;
5607 
5608 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5609 	nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5610 	nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5611 }
5612 
nfs4_proc_commit_rpc_prepare(struct rpc_task * task,struct nfs_commit_data * data)5613 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5614 {
5615 	nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5616 			&data->args.seq_args,
5617 			&data->res.seq_res,
5618 			task);
5619 }
5620 
nfs4_commit_done_cb(struct rpc_task * task,struct nfs_commit_data * data)5621 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5622 {
5623 	struct inode *inode = data->inode;
5624 
5625 	trace_nfs4_commit(data, task->tk_status);
5626 	if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5627 				    NULL, NULL) == -EAGAIN) {
5628 		rpc_restart_call_prepare(task);
5629 		return -EAGAIN;
5630 	}
5631 	return 0;
5632 }
5633 
nfs4_commit_done(struct rpc_task * task,struct nfs_commit_data * data)5634 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5635 {
5636 	if (!nfs4_sequence_done(task, &data->res.seq_res))
5637 		return -EAGAIN;
5638 	return data->commit_done_cb(task, data);
5639 }
5640 
nfs4_proc_commit_setup(struct nfs_commit_data * data,struct rpc_message * msg,struct rpc_clnt ** clnt)5641 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5642 				   struct rpc_clnt **clnt)
5643 {
5644 	struct nfs_server *server = NFS_SERVER(data->inode);
5645 
5646 	if (data->commit_done_cb == NULL)
5647 		data->commit_done_cb = nfs4_commit_done_cb;
5648 	data->res.server = server;
5649 	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5650 	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5651 	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5652 }
5653 
_nfs4_proc_commit(struct file * dst,struct nfs_commitargs * args,struct nfs_commitres * res)5654 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5655 				struct nfs_commitres *res)
5656 {
5657 	struct inode *dst_inode = file_inode(dst);
5658 	struct nfs_server *server = NFS_SERVER(dst_inode);
5659 	struct rpc_message msg = {
5660 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5661 		.rpc_argp = args,
5662 		.rpc_resp = res,
5663 	};
5664 
5665 	args->fh = NFS_FH(dst_inode);
5666 	return nfs4_call_sync(server->client, server, &msg,
5667 			&args->seq_args, &res->seq_res, 1);
5668 }
5669 
nfs4_proc_commit(struct file * dst,__u64 offset,__u32 count,struct nfs_commitres * res)5670 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5671 {
5672 	struct nfs_commitargs args = {
5673 		.offset = offset,
5674 		.count = count,
5675 	};
5676 	struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5677 	struct nfs4_exception exception = { };
5678 	int status;
5679 
5680 	do {
5681 		status = _nfs4_proc_commit(dst, &args, res);
5682 		status = nfs4_handle_exception(dst_server, status, &exception);
5683 	} while (exception.retry);
5684 
5685 	return status;
5686 }
5687 
5688 struct nfs4_renewdata {
5689 	struct nfs_client	*client;
5690 	unsigned long		timestamp;
5691 };
5692 
5693 /*
5694  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5695  * standalone procedure for queueing an asynchronous RENEW.
5696  */
nfs4_renew_release(void * calldata)5697 static void nfs4_renew_release(void *calldata)
5698 {
5699 	struct nfs4_renewdata *data = calldata;
5700 	struct nfs_client *clp = data->client;
5701 
5702 	if (refcount_read(&clp->cl_count) > 1)
5703 		nfs4_schedule_state_renewal(clp);
5704 	nfs_put_client(clp);
5705 	kfree(data);
5706 }
5707 
nfs4_renew_done(struct rpc_task * task,void * calldata)5708 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5709 {
5710 	struct nfs4_renewdata *data = calldata;
5711 	struct nfs_client *clp = data->client;
5712 	unsigned long timestamp = data->timestamp;
5713 
5714 	trace_nfs4_renew_async(clp, task->tk_status);
5715 	switch (task->tk_status) {
5716 	case 0:
5717 		break;
5718 	case -NFS4ERR_LEASE_MOVED:
5719 		nfs4_schedule_lease_moved_recovery(clp);
5720 		break;
5721 	default:
5722 		/* Unless we're shutting down, schedule state recovery! */
5723 		if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5724 			return;
5725 		if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5726 			nfs4_schedule_lease_recovery(clp);
5727 			return;
5728 		}
5729 		nfs4_schedule_path_down_recovery(clp);
5730 	}
5731 	do_renew_lease(clp, timestamp);
5732 }
5733 
5734 static const struct rpc_call_ops nfs4_renew_ops = {
5735 	.rpc_call_done = nfs4_renew_done,
5736 	.rpc_release = nfs4_renew_release,
5737 };
5738 
nfs4_proc_async_renew(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)5739 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5740 {
5741 	struct rpc_message msg = {
5742 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5743 		.rpc_argp	= clp,
5744 		.rpc_cred	= cred,
5745 	};
5746 	struct nfs4_renewdata *data;
5747 
5748 	if (renew_flags == 0)
5749 		return 0;
5750 	if (!refcount_inc_not_zero(&clp->cl_count))
5751 		return -EIO;
5752 	data = kmalloc(sizeof(*data), GFP_NOFS);
5753 	if (data == NULL) {
5754 		nfs_put_client(clp);
5755 		return -ENOMEM;
5756 	}
5757 	data->client = clp;
5758 	data->timestamp = jiffies;
5759 	return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5760 			&nfs4_renew_ops, data);
5761 }
5762 
nfs4_proc_renew(struct nfs_client * clp,const struct cred * cred)5763 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5764 {
5765 	struct rpc_message msg = {
5766 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5767 		.rpc_argp	= clp,
5768 		.rpc_cred	= cred,
5769 	};
5770 	unsigned long now = jiffies;
5771 	int status;
5772 
5773 	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5774 	if (status < 0)
5775 		return status;
5776 	do_renew_lease(clp, now);
5777 	return 0;
5778 }
5779 
nfs4_server_supports_acls(const struct nfs_server * server,enum nfs4_acl_type type)5780 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5781 				      enum nfs4_acl_type type)
5782 {
5783 	switch (type) {
5784 	default:
5785 		return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5786 	case NFS4ACL_DACL:
5787 		return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5788 	case NFS4ACL_SACL:
5789 		return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5790 	}
5791 }
5792 
5793 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5794  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5795  * the stack.
5796  */
5797 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5798 
nfs4_buf_to_pages_noslab(const void * buf,size_t buflen,struct page ** pages)5799 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5800 		struct page **pages)
5801 {
5802 	struct page *newpage, **spages;
5803 	int rc = 0;
5804 	size_t len;
5805 	spages = pages;
5806 
5807 	do {
5808 		len = min_t(size_t, PAGE_SIZE, buflen);
5809 		newpage = alloc_page(GFP_KERNEL);
5810 
5811 		if (newpage == NULL)
5812 			goto unwind;
5813 		memcpy(page_address(newpage), buf, len);
5814 		buf += len;
5815 		buflen -= len;
5816 		*pages++ = newpage;
5817 		rc++;
5818 	} while (buflen != 0);
5819 
5820 	return rc;
5821 
5822 unwind:
5823 	for(; rc > 0; rc--)
5824 		__free_page(spages[rc-1]);
5825 	return -ENOMEM;
5826 }
5827 
5828 struct nfs4_cached_acl {
5829 	enum nfs4_acl_type type;
5830 	int cached;
5831 	size_t len;
5832 	char data[];
5833 };
5834 
nfs4_set_cached_acl(struct inode * inode,struct nfs4_cached_acl * acl)5835 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5836 {
5837 	struct nfs_inode *nfsi = NFS_I(inode);
5838 
5839 	spin_lock(&inode->i_lock);
5840 	kfree(nfsi->nfs4_acl);
5841 	nfsi->nfs4_acl = acl;
5842 	spin_unlock(&inode->i_lock);
5843 }
5844 
nfs4_zap_acl_attr(struct inode * inode)5845 static void nfs4_zap_acl_attr(struct inode *inode)
5846 {
5847 	nfs4_set_cached_acl(inode, NULL);
5848 }
5849 
nfs4_read_cached_acl(struct inode * inode,char * buf,size_t buflen,enum nfs4_acl_type type)5850 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5851 				    size_t buflen, enum nfs4_acl_type type)
5852 {
5853 	struct nfs_inode *nfsi = NFS_I(inode);
5854 	struct nfs4_cached_acl *acl;
5855 	int ret = -ENOENT;
5856 
5857 	spin_lock(&inode->i_lock);
5858 	acl = nfsi->nfs4_acl;
5859 	if (acl == NULL)
5860 		goto out;
5861 	if (acl->type != type)
5862 		goto out;
5863 	if (buf == NULL) /* user is just asking for length */
5864 		goto out_len;
5865 	if (acl->cached == 0)
5866 		goto out;
5867 	ret = -ERANGE; /* see getxattr(2) man page */
5868 	if (acl->len > buflen)
5869 		goto out;
5870 	memcpy(buf, acl->data, acl->len);
5871 out_len:
5872 	ret = acl->len;
5873 out:
5874 	spin_unlock(&inode->i_lock);
5875 	return ret;
5876 }
5877 
nfs4_write_cached_acl(struct inode * inode,struct page ** pages,size_t pgbase,size_t acl_len,enum nfs4_acl_type type)5878 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5879 				  size_t pgbase, size_t acl_len,
5880 				  enum nfs4_acl_type type)
5881 {
5882 	struct nfs4_cached_acl *acl;
5883 	size_t buflen = sizeof(*acl) + acl_len;
5884 
5885 	if (buflen <= PAGE_SIZE) {
5886 		acl = kmalloc(buflen, GFP_KERNEL);
5887 		if (acl == NULL)
5888 			goto out;
5889 		acl->cached = 1;
5890 		_copy_from_pages(acl->data, pages, pgbase, acl_len);
5891 	} else {
5892 		acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5893 		if (acl == NULL)
5894 			goto out;
5895 		acl->cached = 0;
5896 	}
5897 	acl->type = type;
5898 	acl->len = acl_len;
5899 out:
5900 	nfs4_set_cached_acl(inode, acl);
5901 }
5902 
5903 /*
5904  * The getxattr API returns the required buffer length when called with a
5905  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5906  * the required buf.  On a NULL buf, we send a page of data to the server
5907  * guessing that the ACL request can be serviced by a page. If so, we cache
5908  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5909  * the cache. If not so, we throw away the page, and cache the required
5910  * length. The next getxattr call will then produce another round trip to
5911  * the server, this time with the input buf of the required size.
5912  */
__nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)5913 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5914 				       size_t buflen, enum nfs4_acl_type type)
5915 {
5916 	struct page **pages;
5917 	struct nfs_getaclargs args = {
5918 		.fh = NFS_FH(inode),
5919 		.acl_type = type,
5920 		.acl_len = buflen,
5921 	};
5922 	struct nfs_getaclres res = {
5923 		.acl_type = type,
5924 		.acl_len = buflen,
5925 	};
5926 	struct rpc_message msg = {
5927 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5928 		.rpc_argp = &args,
5929 		.rpc_resp = &res,
5930 	};
5931 	unsigned int npages;
5932 	int ret = -ENOMEM, i;
5933 	struct nfs_server *server = NFS_SERVER(inode);
5934 
5935 	if (buflen == 0)
5936 		buflen = server->rsize;
5937 
5938 	npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5939 	pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5940 	if (!pages)
5941 		return -ENOMEM;
5942 
5943 	args.acl_pages = pages;
5944 
5945 	for (i = 0; i < npages; i++) {
5946 		pages[i] = alloc_page(GFP_KERNEL);
5947 		if (!pages[i])
5948 			goto out_free;
5949 	}
5950 
5951 	/* for decoding across pages */
5952 	res.acl_scratch = alloc_page(GFP_KERNEL);
5953 	if (!res.acl_scratch)
5954 		goto out_free;
5955 
5956 	args.acl_len = npages * PAGE_SIZE;
5957 
5958 	dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5959 		__func__, buf, buflen, npages, args.acl_len);
5960 	ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5961 			     &msg, &args.seq_args, &res.seq_res, 0);
5962 	if (ret)
5963 		goto out_free;
5964 
5965 	/* Handle the case where the passed-in buffer is too short */
5966 	if (res.acl_flags & NFS4_ACL_TRUNC) {
5967 		/* Did the user only issue a request for the acl length? */
5968 		if (buf == NULL)
5969 			goto out_ok;
5970 		ret = -ERANGE;
5971 		goto out_free;
5972 	}
5973 	nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
5974 			      type);
5975 	if (buf) {
5976 		if (res.acl_len > buflen) {
5977 			ret = -ERANGE;
5978 			goto out_free;
5979 		}
5980 		_copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5981 	}
5982 out_ok:
5983 	ret = res.acl_len;
5984 out_free:
5985 	for (i = 0; i < npages; i++)
5986 		if (pages[i])
5987 			__free_page(pages[i]);
5988 	if (res.acl_scratch)
5989 		__free_page(res.acl_scratch);
5990 	kfree(pages);
5991 	return ret;
5992 }
5993 
nfs4_get_acl_uncached(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)5994 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
5995 				     size_t buflen, enum nfs4_acl_type type)
5996 {
5997 	struct nfs4_exception exception = {
5998 		.interruptible = true,
5999 	};
6000 	ssize_t ret;
6001 	do {
6002 		ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6003 		trace_nfs4_get_acl(inode, ret);
6004 		if (ret >= 0)
6005 			break;
6006 		ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6007 	} while (exception.retry);
6008 	return ret;
6009 }
6010 
nfs4_proc_get_acl(struct inode * inode,void * buf,size_t buflen,enum nfs4_acl_type type)6011 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6012 				 enum nfs4_acl_type type)
6013 {
6014 	struct nfs_server *server = NFS_SERVER(inode);
6015 	int ret;
6016 
6017 	if (!nfs4_server_supports_acls(server, type))
6018 		return -EOPNOTSUPP;
6019 	ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6020 	if (ret < 0)
6021 		return ret;
6022 	if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6023 		nfs_zap_acl_cache(inode);
6024 	ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6025 	if (ret != -ENOENT)
6026 		/* -ENOENT is returned if there is no ACL or if there is an ACL
6027 		 * but no cached acl data, just the acl length */
6028 		return ret;
6029 	return nfs4_get_acl_uncached(inode, buf, buflen, type);
6030 }
6031 
__nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6032 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6033 			       size_t buflen, enum nfs4_acl_type type)
6034 {
6035 	struct nfs_server *server = NFS_SERVER(inode);
6036 	struct page *pages[NFS4ACL_MAXPAGES];
6037 	struct nfs_setaclargs arg = {
6038 		.fh = NFS_FH(inode),
6039 		.acl_type = type,
6040 		.acl_len = buflen,
6041 		.acl_pages = pages,
6042 	};
6043 	struct nfs_setaclres res;
6044 	struct rpc_message msg = {
6045 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6046 		.rpc_argp	= &arg,
6047 		.rpc_resp	= &res,
6048 	};
6049 	unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6050 	int ret, i;
6051 
6052 	/* You can't remove system.nfs4_acl: */
6053 	if (buflen == 0)
6054 		return -EINVAL;
6055 	if (!nfs4_server_supports_acls(server, type))
6056 		return -EOPNOTSUPP;
6057 	if (npages > ARRAY_SIZE(pages))
6058 		return -ERANGE;
6059 	i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6060 	if (i < 0)
6061 		return i;
6062 	nfs4_inode_make_writeable(inode);
6063 	ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6064 
6065 	/*
6066 	 * Free each page after tx, so the only ref left is
6067 	 * held by the network stack
6068 	 */
6069 	for (; i > 0; i--)
6070 		put_page(pages[i-1]);
6071 
6072 	/*
6073 	 * Acl update can result in inode attribute update.
6074 	 * so mark the attribute cache invalid.
6075 	 */
6076 	spin_lock(&inode->i_lock);
6077 	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6078 					     NFS_INO_INVALID_CTIME |
6079 					     NFS_INO_REVAL_FORCED);
6080 	spin_unlock(&inode->i_lock);
6081 	nfs_access_zap_cache(inode);
6082 	nfs_zap_acl_cache(inode);
6083 	return ret;
6084 }
6085 
nfs4_proc_set_acl(struct inode * inode,const void * buf,size_t buflen,enum nfs4_acl_type type)6086 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6087 			     size_t buflen, enum nfs4_acl_type type)
6088 {
6089 	struct nfs4_exception exception = { };
6090 	int err;
6091 	do {
6092 		err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6093 		trace_nfs4_set_acl(inode, err);
6094 		if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6095 			/*
6096 			 * no need to retry since the kernel
6097 			 * isn't involved in encoding the ACEs.
6098 			 */
6099 			err = -EINVAL;
6100 			break;
6101 		}
6102 		err = nfs4_handle_exception(NFS_SERVER(inode), err,
6103 				&exception);
6104 	} while (exception.retry);
6105 	return err;
6106 }
6107 
6108 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
_nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6109 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6110 					size_t buflen)
6111 {
6112 	struct nfs_server *server = NFS_SERVER(inode);
6113 	struct nfs4_label label = {0, 0, buflen, buf};
6114 
6115 	u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6116 	struct nfs_fattr fattr = {
6117 		.label = &label,
6118 	};
6119 	struct nfs4_getattr_arg arg = {
6120 		.fh		= NFS_FH(inode),
6121 		.bitmask	= bitmask,
6122 	};
6123 	struct nfs4_getattr_res res = {
6124 		.fattr		= &fattr,
6125 		.server		= server,
6126 	};
6127 	struct rpc_message msg = {
6128 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6129 		.rpc_argp	= &arg,
6130 		.rpc_resp	= &res,
6131 	};
6132 	int ret;
6133 
6134 	nfs_fattr_init(&fattr);
6135 
6136 	ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6137 	if (ret)
6138 		return ret;
6139 	if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6140 		return -ENOENT;
6141 	return label.len;
6142 }
6143 
nfs4_get_security_label(struct inode * inode,void * buf,size_t buflen)6144 static int nfs4_get_security_label(struct inode *inode, void *buf,
6145 					size_t buflen)
6146 {
6147 	struct nfs4_exception exception = {
6148 		.interruptible = true,
6149 	};
6150 	int err;
6151 
6152 	if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6153 		return -EOPNOTSUPP;
6154 
6155 	do {
6156 		err = _nfs4_get_security_label(inode, buf, buflen);
6157 		trace_nfs4_get_security_label(inode, err);
6158 		err = nfs4_handle_exception(NFS_SERVER(inode), err,
6159 				&exception);
6160 	} while (exception.retry);
6161 	return err;
6162 }
6163 
_nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6164 static int _nfs4_do_set_security_label(struct inode *inode,
6165 		struct nfs4_label *ilabel,
6166 		struct nfs_fattr *fattr)
6167 {
6168 
6169 	struct iattr sattr = {0};
6170 	struct nfs_server *server = NFS_SERVER(inode);
6171 	const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6172 	struct nfs_setattrargs arg = {
6173 		.fh		= NFS_FH(inode),
6174 		.iap		= &sattr,
6175 		.server		= server,
6176 		.bitmask	= bitmask,
6177 		.label		= ilabel,
6178 	};
6179 	struct nfs_setattrres res = {
6180 		.fattr		= fattr,
6181 		.server		= server,
6182 	};
6183 	struct rpc_message msg = {
6184 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6185 		.rpc_argp	= &arg,
6186 		.rpc_resp	= &res,
6187 	};
6188 	int status;
6189 
6190 	nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6191 
6192 	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6193 	if (status)
6194 		dprintk("%s failed: %d\n", __func__, status);
6195 
6196 	return status;
6197 }
6198 
nfs4_do_set_security_label(struct inode * inode,struct nfs4_label * ilabel,struct nfs_fattr * fattr)6199 static int nfs4_do_set_security_label(struct inode *inode,
6200 		struct nfs4_label *ilabel,
6201 		struct nfs_fattr *fattr)
6202 {
6203 	struct nfs4_exception exception = { };
6204 	int err;
6205 
6206 	do {
6207 		err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6208 		trace_nfs4_set_security_label(inode, err);
6209 		err = nfs4_handle_exception(NFS_SERVER(inode), err,
6210 				&exception);
6211 	} while (exception.retry);
6212 	return err;
6213 }
6214 
6215 static int
nfs4_set_security_label(struct inode * inode,const void * buf,size_t buflen)6216 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6217 {
6218 	struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6219 	struct nfs_fattr *fattr;
6220 	int status;
6221 
6222 	if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6223 		return -EOPNOTSUPP;
6224 
6225 	fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6226 	if (fattr == NULL)
6227 		return -ENOMEM;
6228 
6229 	status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6230 	if (status == 0)
6231 		nfs_setsecurity(inode, fattr);
6232 
6233 	return status;
6234 }
6235 #endif	/* CONFIG_NFS_V4_SECURITY_LABEL */
6236 
6237 
nfs4_init_boot_verifier(const struct nfs_client * clp,nfs4_verifier * bootverf)6238 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6239 				    nfs4_verifier *bootverf)
6240 {
6241 	__be32 verf[2];
6242 
6243 	if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6244 		/* An impossible timestamp guarantees this value
6245 		 * will never match a generated boot time. */
6246 		verf[0] = cpu_to_be32(U32_MAX);
6247 		verf[1] = cpu_to_be32(U32_MAX);
6248 	} else {
6249 		struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6250 		u64 ns = ktime_to_ns(nn->boot_time);
6251 
6252 		verf[0] = cpu_to_be32(ns >> 32);
6253 		verf[1] = cpu_to_be32(ns);
6254 	}
6255 	memcpy(bootverf->data, verf, sizeof(bootverf->data));
6256 }
6257 
6258 static size_t
nfs4_get_uniquifier(struct nfs_client * clp,char * buf,size_t buflen)6259 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6260 {
6261 	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6262 	struct nfs_netns_client *nn_clp = nn->nfs_client;
6263 	const char *id;
6264 
6265 	buf[0] = '\0';
6266 
6267 	if (nn_clp) {
6268 		rcu_read_lock();
6269 		id = rcu_dereference(nn_clp->identifier);
6270 		if (id)
6271 			strscpy(buf, id, buflen);
6272 		rcu_read_unlock();
6273 	}
6274 
6275 	if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6276 		strscpy(buf, nfs4_client_id_uniquifier, buflen);
6277 
6278 	return strlen(buf);
6279 }
6280 
6281 static int
nfs4_init_nonuniform_client_string(struct nfs_client * clp)6282 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6283 {
6284 	char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6285 	size_t buflen;
6286 	size_t len;
6287 	char *str;
6288 
6289 	if (clp->cl_owner_id != NULL)
6290 		return 0;
6291 
6292 	rcu_read_lock();
6293 	len = 14 +
6294 		strlen(clp->cl_rpcclient->cl_nodename) +
6295 		1 +
6296 		strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6297 		1;
6298 	rcu_read_unlock();
6299 
6300 	buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6301 	if (buflen)
6302 		len += buflen + 1;
6303 
6304 	if (len > NFS4_OPAQUE_LIMIT + 1)
6305 		return -EINVAL;
6306 
6307 	/*
6308 	 * Since this string is allocated at mount time, and held until the
6309 	 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6310 	 * about a memory-reclaim deadlock.
6311 	 */
6312 	str = kmalloc(len, GFP_KERNEL);
6313 	if (!str)
6314 		return -ENOMEM;
6315 
6316 	rcu_read_lock();
6317 	if (buflen)
6318 		scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6319 			  clp->cl_rpcclient->cl_nodename, buf,
6320 			  rpc_peeraddr2str(clp->cl_rpcclient,
6321 					   RPC_DISPLAY_ADDR));
6322 	else
6323 		scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6324 			  clp->cl_rpcclient->cl_nodename,
6325 			  rpc_peeraddr2str(clp->cl_rpcclient,
6326 					   RPC_DISPLAY_ADDR));
6327 	rcu_read_unlock();
6328 
6329 	clp->cl_owner_id = str;
6330 	return 0;
6331 }
6332 
6333 static int
nfs4_init_uniform_client_string(struct nfs_client * clp)6334 nfs4_init_uniform_client_string(struct nfs_client *clp)
6335 {
6336 	char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6337 	size_t buflen;
6338 	size_t len;
6339 	char *str;
6340 
6341 	if (clp->cl_owner_id != NULL)
6342 		return 0;
6343 
6344 	len = 10 + 10 + 1 + 10 + 1 +
6345 		strlen(clp->cl_rpcclient->cl_nodename) + 1;
6346 
6347 	buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6348 	if (buflen)
6349 		len += buflen + 1;
6350 
6351 	if (len > NFS4_OPAQUE_LIMIT + 1)
6352 		return -EINVAL;
6353 
6354 	/*
6355 	 * Since this string is allocated at mount time, and held until the
6356 	 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6357 	 * about a memory-reclaim deadlock.
6358 	 */
6359 	str = kmalloc(len, GFP_KERNEL);
6360 	if (!str)
6361 		return -ENOMEM;
6362 
6363 	if (buflen)
6364 		scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6365 			  clp->rpc_ops->version, clp->cl_minorversion,
6366 			  buf, clp->cl_rpcclient->cl_nodename);
6367 	else
6368 		scnprintf(str, len, "Linux NFSv%u.%u %s",
6369 			  clp->rpc_ops->version, clp->cl_minorversion,
6370 			  clp->cl_rpcclient->cl_nodename);
6371 	clp->cl_owner_id = str;
6372 	return 0;
6373 }
6374 
6375 /*
6376  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6377  * services.  Advertise one based on the address family of the
6378  * clientaddr.
6379  */
6380 static unsigned int
nfs4_init_callback_netid(const struct nfs_client * clp,char * buf,size_t len)6381 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6382 {
6383 	if (strchr(clp->cl_ipaddr, ':') != NULL)
6384 		return scnprintf(buf, len, "tcp6");
6385 	else
6386 		return scnprintf(buf, len, "tcp");
6387 }
6388 
nfs4_setclientid_done(struct rpc_task * task,void * calldata)6389 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6390 {
6391 	struct nfs4_setclientid *sc = calldata;
6392 
6393 	if (task->tk_status == 0)
6394 		sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6395 }
6396 
6397 static const struct rpc_call_ops nfs4_setclientid_ops = {
6398 	.rpc_call_done = nfs4_setclientid_done,
6399 };
6400 
6401 /**
6402  * nfs4_proc_setclientid - Negotiate client ID
6403  * @clp: state data structure
6404  * @program: RPC program for NFSv4 callback service
6405  * @port: IP port number for NFS4 callback service
6406  * @cred: credential to use for this call
6407  * @res: where to place the result
6408  *
6409  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6410  */
nfs4_proc_setclientid(struct nfs_client * clp,u32 program,unsigned short port,const struct cred * cred,struct nfs4_setclientid_res * res)6411 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6412 		unsigned short port, const struct cred *cred,
6413 		struct nfs4_setclientid_res *res)
6414 {
6415 	nfs4_verifier sc_verifier;
6416 	struct nfs4_setclientid setclientid = {
6417 		.sc_verifier = &sc_verifier,
6418 		.sc_prog = program,
6419 		.sc_clnt = clp,
6420 	};
6421 	struct rpc_message msg = {
6422 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6423 		.rpc_argp = &setclientid,
6424 		.rpc_resp = res,
6425 		.rpc_cred = cred,
6426 	};
6427 	struct rpc_task_setup task_setup_data = {
6428 		.rpc_client = clp->cl_rpcclient,
6429 		.rpc_message = &msg,
6430 		.callback_ops = &nfs4_setclientid_ops,
6431 		.callback_data = &setclientid,
6432 		.flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6433 	};
6434 	unsigned long now = jiffies;
6435 	int status;
6436 
6437 	/* nfs_client_id4 */
6438 	nfs4_init_boot_verifier(clp, &sc_verifier);
6439 
6440 	if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6441 		status = nfs4_init_uniform_client_string(clp);
6442 	else
6443 		status = nfs4_init_nonuniform_client_string(clp);
6444 
6445 	if (status)
6446 		goto out;
6447 
6448 	/* cb_client4 */
6449 	setclientid.sc_netid_len =
6450 				nfs4_init_callback_netid(clp,
6451 						setclientid.sc_netid,
6452 						sizeof(setclientid.sc_netid));
6453 	setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6454 				sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6455 				clp->cl_ipaddr, port >> 8, port & 255);
6456 
6457 	dprintk("NFS call  setclientid auth=%s, '%s'\n",
6458 		clp->cl_rpcclient->cl_auth->au_ops->au_name,
6459 		clp->cl_owner_id);
6460 
6461 	status = nfs4_call_sync_custom(&task_setup_data);
6462 	if (setclientid.sc_cred) {
6463 		kfree(clp->cl_acceptor);
6464 		clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6465 		put_rpccred(setclientid.sc_cred);
6466 	}
6467 
6468 	if (status == 0)
6469 		do_renew_lease(clp, now);
6470 out:
6471 	trace_nfs4_setclientid(clp, status);
6472 	dprintk("NFS reply setclientid: %d\n", status);
6473 	return status;
6474 }
6475 
6476 /**
6477  * nfs4_proc_setclientid_confirm - Confirm client ID
6478  * @clp: state data structure
6479  * @arg: result of a previous SETCLIENTID
6480  * @cred: credential to use for this call
6481  *
6482  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6483  */
nfs4_proc_setclientid_confirm(struct nfs_client * clp,struct nfs4_setclientid_res * arg,const struct cred * cred)6484 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6485 		struct nfs4_setclientid_res *arg,
6486 		const struct cred *cred)
6487 {
6488 	struct rpc_message msg = {
6489 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6490 		.rpc_argp = arg,
6491 		.rpc_cred = cred,
6492 	};
6493 	int status;
6494 
6495 	dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6496 		clp->cl_rpcclient->cl_auth->au_ops->au_name,
6497 		clp->cl_clientid);
6498 	status = rpc_call_sync(clp->cl_rpcclient, &msg,
6499 			       RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6500 	trace_nfs4_setclientid_confirm(clp, status);
6501 	dprintk("NFS reply setclientid_confirm: %d\n", status);
6502 	return status;
6503 }
6504 
6505 struct nfs4_delegreturndata {
6506 	struct nfs4_delegreturnargs args;
6507 	struct nfs4_delegreturnres res;
6508 	struct nfs_fh fh;
6509 	nfs4_stateid stateid;
6510 	unsigned long timestamp;
6511 	struct {
6512 		struct nfs4_layoutreturn_args arg;
6513 		struct nfs4_layoutreturn_res res;
6514 		struct nfs4_xdr_opaque_data ld_private;
6515 		u32 roc_barrier;
6516 		bool roc;
6517 	} lr;
6518 	struct nfs_fattr fattr;
6519 	int rpc_status;
6520 	struct inode *inode;
6521 };
6522 
nfs4_delegreturn_done(struct rpc_task * task,void * calldata)6523 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6524 {
6525 	struct nfs4_delegreturndata *data = calldata;
6526 	struct nfs4_exception exception = {
6527 		.inode = data->inode,
6528 		.stateid = &data->stateid,
6529 		.task_is_privileged = data->args.seq_args.sa_privileged,
6530 	};
6531 
6532 	if (!nfs4_sequence_done(task, &data->res.seq_res))
6533 		return;
6534 
6535 	trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6536 
6537 	/* Handle Layoutreturn errors */
6538 	if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6539 			  &data->res.lr_ret) == -EAGAIN)
6540 		goto out_restart;
6541 
6542 	switch (task->tk_status) {
6543 	case 0:
6544 		renew_lease(data->res.server, data->timestamp);
6545 		break;
6546 	case -NFS4ERR_ADMIN_REVOKED:
6547 	case -NFS4ERR_DELEG_REVOKED:
6548 	case -NFS4ERR_EXPIRED:
6549 		nfs4_free_revoked_stateid(data->res.server,
6550 				data->args.stateid,
6551 				task->tk_msg.rpc_cred);
6552 		fallthrough;
6553 	case -NFS4ERR_BAD_STATEID:
6554 	case -NFS4ERR_STALE_STATEID:
6555 	case -ETIMEDOUT:
6556 		task->tk_status = 0;
6557 		break;
6558 	case -NFS4ERR_OLD_STATEID:
6559 		if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6560 			nfs4_stateid_seqid_inc(&data->stateid);
6561 		if (data->args.bitmask) {
6562 			data->args.bitmask = NULL;
6563 			data->res.fattr = NULL;
6564 		}
6565 		goto out_restart;
6566 	case -NFS4ERR_ACCESS:
6567 		if (data->args.bitmask) {
6568 			data->args.bitmask = NULL;
6569 			data->res.fattr = NULL;
6570 			goto out_restart;
6571 		}
6572 		fallthrough;
6573 	default:
6574 		task->tk_status = nfs4_async_handle_exception(task,
6575 				data->res.server, task->tk_status,
6576 				&exception);
6577 		if (exception.retry)
6578 			goto out_restart;
6579 	}
6580 	nfs_delegation_mark_returned(data->inode, data->args.stateid);
6581 	data->rpc_status = task->tk_status;
6582 	return;
6583 out_restart:
6584 	task->tk_status = 0;
6585 	rpc_restart_call_prepare(task);
6586 }
6587 
nfs4_delegreturn_release(void * calldata)6588 static void nfs4_delegreturn_release(void *calldata)
6589 {
6590 	struct nfs4_delegreturndata *data = calldata;
6591 	struct inode *inode = data->inode;
6592 
6593 	if (data->lr.roc)
6594 		pnfs_roc_release(&data->lr.arg, &data->lr.res,
6595 				 data->res.lr_ret);
6596 	if (inode) {
6597 		nfs4_fattr_set_prechange(&data->fattr,
6598 					 inode_peek_iversion_raw(inode));
6599 		nfs_refresh_inode(inode, &data->fattr);
6600 		nfs_iput_and_deactive(inode);
6601 	}
6602 	kfree(calldata);
6603 }
6604 
nfs4_delegreturn_prepare(struct rpc_task * task,void * data)6605 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6606 {
6607 	struct nfs4_delegreturndata *d_data;
6608 	struct pnfs_layout_hdr *lo;
6609 
6610 	d_data = (struct nfs4_delegreturndata *)data;
6611 
6612 	if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6613 		nfs4_sequence_done(task, &d_data->res.seq_res);
6614 		return;
6615 	}
6616 
6617 	lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6618 	if (lo && !pnfs_layout_is_valid(lo)) {
6619 		d_data->args.lr_args = NULL;
6620 		d_data->res.lr_res = NULL;
6621 	}
6622 
6623 	nfs4_setup_sequence(d_data->res.server->nfs_client,
6624 			&d_data->args.seq_args,
6625 			&d_data->res.seq_res,
6626 			task);
6627 }
6628 
6629 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6630 	.rpc_call_prepare = nfs4_delegreturn_prepare,
6631 	.rpc_call_done = nfs4_delegreturn_done,
6632 	.rpc_release = nfs4_delegreturn_release,
6633 };
6634 
_nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,int issync)6635 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6636 {
6637 	struct nfs4_delegreturndata *data;
6638 	struct nfs_server *server = NFS_SERVER(inode);
6639 	struct rpc_task *task;
6640 	struct rpc_message msg = {
6641 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6642 		.rpc_cred = cred,
6643 	};
6644 	struct rpc_task_setup task_setup_data = {
6645 		.rpc_client = server->client,
6646 		.rpc_message = &msg,
6647 		.callback_ops = &nfs4_delegreturn_ops,
6648 		.flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6649 	};
6650 	int status = 0;
6651 
6652 	if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6653 		task_setup_data.flags |= RPC_TASK_MOVEABLE;
6654 
6655 	data = kzalloc(sizeof(*data), GFP_KERNEL);
6656 	if (data == NULL)
6657 		return -ENOMEM;
6658 
6659 	nfs4_state_protect(server->nfs_client,
6660 			NFS_SP4_MACH_CRED_CLEANUP,
6661 			&task_setup_data.rpc_client, &msg);
6662 
6663 	data->args.fhandle = &data->fh;
6664 	data->args.stateid = &data->stateid;
6665 	nfs4_bitmask_set(data->args.bitmask_store,
6666 			 server->cache_consistency_bitmask, inode, 0);
6667 	data->args.bitmask = data->args.bitmask_store;
6668 	nfs_copy_fh(&data->fh, NFS_FH(inode));
6669 	nfs4_stateid_copy(&data->stateid, stateid);
6670 	data->res.fattr = &data->fattr;
6671 	data->res.server = server;
6672 	data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6673 	data->lr.arg.ld_private = &data->lr.ld_private;
6674 	nfs_fattr_init(data->res.fattr);
6675 	data->timestamp = jiffies;
6676 	data->rpc_status = 0;
6677 	data->inode = nfs_igrab_and_active(inode);
6678 	if (data->inode || issync) {
6679 		data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6680 					cred);
6681 		if (data->lr.roc) {
6682 			data->args.lr_args = &data->lr.arg;
6683 			data->res.lr_res = &data->lr.res;
6684 		}
6685 	}
6686 
6687 	if (!data->inode)
6688 		nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6689 				   1);
6690 	else
6691 		nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6692 				   0);
6693 	task_setup_data.callback_data = data;
6694 	msg.rpc_argp = &data->args;
6695 	msg.rpc_resp = &data->res;
6696 	task = rpc_run_task(&task_setup_data);
6697 	if (IS_ERR(task))
6698 		return PTR_ERR(task);
6699 	if (!issync)
6700 		goto out;
6701 	status = rpc_wait_for_completion_task(task);
6702 	if (status != 0)
6703 		goto out;
6704 	status = data->rpc_status;
6705 out:
6706 	rpc_put_task(task);
6707 	return status;
6708 }
6709 
nfs4_proc_delegreturn(struct inode * inode,const struct cred * cred,const nfs4_stateid * stateid,int issync)6710 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6711 {
6712 	struct nfs_server *server = NFS_SERVER(inode);
6713 	struct nfs4_exception exception = { };
6714 	int err;
6715 	do {
6716 		err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6717 		trace_nfs4_delegreturn(inode, stateid, err);
6718 		switch (err) {
6719 			case -NFS4ERR_STALE_STATEID:
6720 			case -NFS4ERR_EXPIRED:
6721 			case 0:
6722 				return 0;
6723 		}
6724 		err = nfs4_handle_exception(server, err, &exception);
6725 	} while (exception.retry);
6726 	return err;
6727 }
6728 
_nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6729 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6730 {
6731 	struct inode *inode = state->inode;
6732 	struct nfs_server *server = NFS_SERVER(inode);
6733 	struct nfs_client *clp = server->nfs_client;
6734 	struct nfs_lockt_args arg = {
6735 		.fh = NFS_FH(inode),
6736 		.fl = request,
6737 	};
6738 	struct nfs_lockt_res res = {
6739 		.denied = request,
6740 	};
6741 	struct rpc_message msg = {
6742 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6743 		.rpc_argp	= &arg,
6744 		.rpc_resp	= &res,
6745 		.rpc_cred	= state->owner->so_cred,
6746 	};
6747 	struct nfs4_lock_state *lsp;
6748 	int status;
6749 
6750 	arg.lock_owner.clientid = clp->cl_clientid;
6751 	status = nfs4_set_lock_state(state, request);
6752 	if (status != 0)
6753 		goto out;
6754 	lsp = request->fl_u.nfs4_fl.owner;
6755 	arg.lock_owner.id = lsp->ls_seqid.owner_id;
6756 	arg.lock_owner.s_dev = server->s_dev;
6757 	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6758 	switch (status) {
6759 		case 0:
6760 			request->fl_type = F_UNLCK;
6761 			break;
6762 		case -NFS4ERR_DENIED:
6763 			status = 0;
6764 	}
6765 	request->fl_ops->fl_release_private(request);
6766 	request->fl_ops = NULL;
6767 out:
6768 	return status;
6769 }
6770 
nfs4_proc_getlk(struct nfs4_state * state,int cmd,struct file_lock * request)6771 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6772 {
6773 	struct nfs4_exception exception = {
6774 		.interruptible = true,
6775 	};
6776 	int err;
6777 
6778 	do {
6779 		err = _nfs4_proc_getlk(state, cmd, request);
6780 		trace_nfs4_get_lock(request, state, cmd, err);
6781 		err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6782 				&exception);
6783 	} while (exception.retry);
6784 	return err;
6785 }
6786 
6787 /*
6788  * Update the seqid of a lock stateid after receiving
6789  * NFS4ERR_OLD_STATEID
6790  */
nfs4_refresh_lock_old_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)6791 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6792 		struct nfs4_lock_state *lsp)
6793 {
6794 	struct nfs4_state *state = lsp->ls_state;
6795 	bool ret = false;
6796 
6797 	spin_lock(&state->state_lock);
6798 	if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6799 		goto out;
6800 	if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6801 		nfs4_stateid_seqid_inc(dst);
6802 	else
6803 		dst->seqid = lsp->ls_stateid.seqid;
6804 	ret = true;
6805 out:
6806 	spin_unlock(&state->state_lock);
6807 	return ret;
6808 }
6809 
nfs4_sync_lock_stateid(nfs4_stateid * dst,struct nfs4_lock_state * lsp)6810 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6811 		struct nfs4_lock_state *lsp)
6812 {
6813 	struct nfs4_state *state = lsp->ls_state;
6814 	bool ret;
6815 
6816 	spin_lock(&state->state_lock);
6817 	ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6818 	nfs4_stateid_copy(dst, &lsp->ls_stateid);
6819 	spin_unlock(&state->state_lock);
6820 	return ret;
6821 }
6822 
6823 struct nfs4_unlockdata {
6824 	struct nfs_locku_args arg;
6825 	struct nfs_locku_res res;
6826 	struct nfs4_lock_state *lsp;
6827 	struct nfs_open_context *ctx;
6828 	struct nfs_lock_context *l_ctx;
6829 	struct file_lock fl;
6830 	struct nfs_server *server;
6831 	unsigned long timestamp;
6832 };
6833 
nfs4_alloc_unlockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)6834 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6835 		struct nfs_open_context *ctx,
6836 		struct nfs4_lock_state *lsp,
6837 		struct nfs_seqid *seqid)
6838 {
6839 	struct nfs4_unlockdata *p;
6840 	struct nfs4_state *state = lsp->ls_state;
6841 	struct inode *inode = state->inode;
6842 
6843 	p = kzalloc(sizeof(*p), GFP_KERNEL);
6844 	if (p == NULL)
6845 		return NULL;
6846 	p->arg.fh = NFS_FH(inode);
6847 	p->arg.fl = &p->fl;
6848 	p->arg.seqid = seqid;
6849 	p->res.seqid = seqid;
6850 	p->lsp = lsp;
6851 	/* Ensure we don't close file until we're done freeing locks! */
6852 	p->ctx = get_nfs_open_context(ctx);
6853 	p->l_ctx = nfs_get_lock_context(ctx);
6854 	locks_init_lock(&p->fl);
6855 	locks_copy_lock(&p->fl, fl);
6856 	p->server = NFS_SERVER(inode);
6857 	spin_lock(&state->state_lock);
6858 	nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6859 	spin_unlock(&state->state_lock);
6860 	return p;
6861 }
6862 
nfs4_locku_release_calldata(void * data)6863 static void nfs4_locku_release_calldata(void *data)
6864 {
6865 	struct nfs4_unlockdata *calldata = data;
6866 	nfs_free_seqid(calldata->arg.seqid);
6867 	nfs4_put_lock_state(calldata->lsp);
6868 	nfs_put_lock_context(calldata->l_ctx);
6869 	put_nfs_open_context(calldata->ctx);
6870 	kfree(calldata);
6871 }
6872 
nfs4_locku_done(struct rpc_task * task,void * data)6873 static void nfs4_locku_done(struct rpc_task *task, void *data)
6874 {
6875 	struct nfs4_unlockdata *calldata = data;
6876 	struct nfs4_exception exception = {
6877 		.inode = calldata->lsp->ls_state->inode,
6878 		.stateid = &calldata->arg.stateid,
6879 	};
6880 
6881 	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6882 		return;
6883 	switch (task->tk_status) {
6884 		case 0:
6885 			renew_lease(calldata->server, calldata->timestamp);
6886 			locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6887 			if (nfs4_update_lock_stateid(calldata->lsp,
6888 					&calldata->res.stateid))
6889 				break;
6890 			fallthrough;
6891 		case -NFS4ERR_ADMIN_REVOKED:
6892 		case -NFS4ERR_EXPIRED:
6893 			nfs4_free_revoked_stateid(calldata->server,
6894 					&calldata->arg.stateid,
6895 					task->tk_msg.rpc_cred);
6896 			fallthrough;
6897 		case -NFS4ERR_BAD_STATEID:
6898 		case -NFS4ERR_STALE_STATEID:
6899 			if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6900 						calldata->lsp))
6901 				rpc_restart_call_prepare(task);
6902 			break;
6903 		case -NFS4ERR_OLD_STATEID:
6904 			if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6905 						calldata->lsp))
6906 				rpc_restart_call_prepare(task);
6907 			break;
6908 		default:
6909 			task->tk_status = nfs4_async_handle_exception(task,
6910 					calldata->server, task->tk_status,
6911 					&exception);
6912 			if (exception.retry)
6913 				rpc_restart_call_prepare(task);
6914 	}
6915 	nfs_release_seqid(calldata->arg.seqid);
6916 }
6917 
nfs4_locku_prepare(struct rpc_task * task,void * data)6918 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6919 {
6920 	struct nfs4_unlockdata *calldata = data;
6921 
6922 	if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6923 		nfs_async_iocounter_wait(task, calldata->l_ctx))
6924 		return;
6925 
6926 	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6927 		goto out_wait;
6928 	if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6929 		/* Note: exit _without_ running nfs4_locku_done */
6930 		goto out_no_action;
6931 	}
6932 	calldata->timestamp = jiffies;
6933 	if (nfs4_setup_sequence(calldata->server->nfs_client,
6934 				&calldata->arg.seq_args,
6935 				&calldata->res.seq_res,
6936 				task) != 0)
6937 		nfs_release_seqid(calldata->arg.seqid);
6938 	return;
6939 out_no_action:
6940 	task->tk_action = NULL;
6941 out_wait:
6942 	nfs4_sequence_done(task, &calldata->res.seq_res);
6943 }
6944 
6945 static const struct rpc_call_ops nfs4_locku_ops = {
6946 	.rpc_call_prepare = nfs4_locku_prepare,
6947 	.rpc_call_done = nfs4_locku_done,
6948 	.rpc_release = nfs4_locku_release_calldata,
6949 };
6950 
nfs4_do_unlck(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,struct nfs_seqid * seqid)6951 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6952 		struct nfs_open_context *ctx,
6953 		struct nfs4_lock_state *lsp,
6954 		struct nfs_seqid *seqid)
6955 {
6956 	struct nfs4_unlockdata *data;
6957 	struct rpc_message msg = {
6958 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6959 		.rpc_cred = ctx->cred,
6960 	};
6961 	struct rpc_task_setup task_setup_data = {
6962 		.rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6963 		.rpc_message = &msg,
6964 		.callback_ops = &nfs4_locku_ops,
6965 		.workqueue = nfsiod_workqueue,
6966 		.flags = RPC_TASK_ASYNC,
6967 	};
6968 
6969 	if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
6970 		task_setup_data.flags |= RPC_TASK_MOVEABLE;
6971 
6972 	nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6973 		NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6974 
6975 	/* Ensure this is an unlock - when canceling a lock, the
6976 	 * canceled lock is passed in, and it won't be an unlock.
6977 	 */
6978 	fl->fl_type = F_UNLCK;
6979 	if (fl->fl_flags & FL_CLOSE)
6980 		set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6981 
6982 	data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6983 	if (data == NULL) {
6984 		nfs_free_seqid(seqid);
6985 		return ERR_PTR(-ENOMEM);
6986 	}
6987 
6988 	nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6989 	msg.rpc_argp = &data->arg;
6990 	msg.rpc_resp = &data->res;
6991 	task_setup_data.callback_data = data;
6992 	return rpc_run_task(&task_setup_data);
6993 }
6994 
nfs4_proc_unlck(struct nfs4_state * state,int cmd,struct file_lock * request)6995 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6996 {
6997 	struct inode *inode = state->inode;
6998 	struct nfs4_state_owner *sp = state->owner;
6999 	struct nfs_inode *nfsi = NFS_I(inode);
7000 	struct nfs_seqid *seqid;
7001 	struct nfs4_lock_state *lsp;
7002 	struct rpc_task *task;
7003 	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7004 	int status = 0;
7005 	unsigned char fl_flags = request->fl_flags;
7006 
7007 	status = nfs4_set_lock_state(state, request);
7008 	/* Unlock _before_ we do the RPC call */
7009 	request->fl_flags |= FL_EXISTS;
7010 	/* Exclude nfs_delegation_claim_locks() */
7011 	mutex_lock(&sp->so_delegreturn_mutex);
7012 	/* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7013 	down_read(&nfsi->rwsem);
7014 	if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7015 		up_read(&nfsi->rwsem);
7016 		mutex_unlock(&sp->so_delegreturn_mutex);
7017 		goto out;
7018 	}
7019 	up_read(&nfsi->rwsem);
7020 	mutex_unlock(&sp->so_delegreturn_mutex);
7021 	if (status != 0)
7022 		goto out;
7023 	/* Is this a delegated lock? */
7024 	lsp = request->fl_u.nfs4_fl.owner;
7025 	if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7026 		goto out;
7027 	alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7028 	seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7029 	status = -ENOMEM;
7030 	if (IS_ERR(seqid))
7031 		goto out;
7032 	task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7033 	status = PTR_ERR(task);
7034 	if (IS_ERR(task))
7035 		goto out;
7036 	status = rpc_wait_for_completion_task(task);
7037 	rpc_put_task(task);
7038 out:
7039 	request->fl_flags = fl_flags;
7040 	trace_nfs4_unlock(request, state, F_SETLK, status);
7041 	return status;
7042 }
7043 
7044 struct nfs4_lockdata {
7045 	struct nfs_lock_args arg;
7046 	struct nfs_lock_res res;
7047 	struct nfs4_lock_state *lsp;
7048 	struct nfs_open_context *ctx;
7049 	struct file_lock fl;
7050 	unsigned long timestamp;
7051 	int rpc_status;
7052 	int cancelled;
7053 	struct nfs_server *server;
7054 };
7055 
nfs4_alloc_lockdata(struct file_lock * fl,struct nfs_open_context * ctx,struct nfs4_lock_state * lsp,gfp_t gfp_mask)7056 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7057 		struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7058 		gfp_t gfp_mask)
7059 {
7060 	struct nfs4_lockdata *p;
7061 	struct inode *inode = lsp->ls_state->inode;
7062 	struct nfs_server *server = NFS_SERVER(inode);
7063 	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7064 
7065 	p = kzalloc(sizeof(*p), gfp_mask);
7066 	if (p == NULL)
7067 		return NULL;
7068 
7069 	p->arg.fh = NFS_FH(inode);
7070 	p->arg.fl = &p->fl;
7071 	p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7072 	if (IS_ERR(p->arg.open_seqid))
7073 		goto out_free;
7074 	alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7075 	p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7076 	if (IS_ERR(p->arg.lock_seqid))
7077 		goto out_free_seqid;
7078 	p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7079 	p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7080 	p->arg.lock_owner.s_dev = server->s_dev;
7081 	p->res.lock_seqid = p->arg.lock_seqid;
7082 	p->lsp = lsp;
7083 	p->server = server;
7084 	p->ctx = get_nfs_open_context(ctx);
7085 	locks_init_lock(&p->fl);
7086 	locks_copy_lock(&p->fl, fl);
7087 	return p;
7088 out_free_seqid:
7089 	nfs_free_seqid(p->arg.open_seqid);
7090 out_free:
7091 	kfree(p);
7092 	return NULL;
7093 }
7094 
nfs4_lock_prepare(struct rpc_task * task,void * calldata)7095 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7096 {
7097 	struct nfs4_lockdata *data = calldata;
7098 	struct nfs4_state *state = data->lsp->ls_state;
7099 
7100 	if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7101 		goto out_wait;
7102 	/* Do we need to do an open_to_lock_owner? */
7103 	if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7104 		if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7105 			goto out_release_lock_seqid;
7106 		}
7107 		nfs4_stateid_copy(&data->arg.open_stateid,
7108 				&state->open_stateid);
7109 		data->arg.new_lock_owner = 1;
7110 		data->res.open_seqid = data->arg.open_seqid;
7111 	} else {
7112 		data->arg.new_lock_owner = 0;
7113 		nfs4_stateid_copy(&data->arg.lock_stateid,
7114 				&data->lsp->ls_stateid);
7115 	}
7116 	if (!nfs4_valid_open_stateid(state)) {
7117 		data->rpc_status = -EBADF;
7118 		task->tk_action = NULL;
7119 		goto out_release_open_seqid;
7120 	}
7121 	data->timestamp = jiffies;
7122 	if (nfs4_setup_sequence(data->server->nfs_client,
7123 				&data->arg.seq_args,
7124 				&data->res.seq_res,
7125 				task) == 0)
7126 		return;
7127 out_release_open_seqid:
7128 	nfs_release_seqid(data->arg.open_seqid);
7129 out_release_lock_seqid:
7130 	nfs_release_seqid(data->arg.lock_seqid);
7131 out_wait:
7132 	nfs4_sequence_done(task, &data->res.seq_res);
7133 	dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7134 }
7135 
nfs4_lock_done(struct rpc_task * task,void * calldata)7136 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7137 {
7138 	struct nfs4_lockdata *data = calldata;
7139 	struct nfs4_lock_state *lsp = data->lsp;
7140 
7141 	if (!nfs4_sequence_done(task, &data->res.seq_res))
7142 		return;
7143 
7144 	data->rpc_status = task->tk_status;
7145 	switch (task->tk_status) {
7146 	case 0:
7147 		renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7148 				data->timestamp);
7149 		if (data->arg.new_lock && !data->cancelled) {
7150 			data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7151 			if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7152 				goto out_restart;
7153 		}
7154 		if (data->arg.new_lock_owner != 0) {
7155 			nfs_confirm_seqid(&lsp->ls_seqid, 0);
7156 			nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7157 			set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7158 		} else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7159 			goto out_restart;
7160 		break;
7161 	case -NFS4ERR_BAD_STATEID:
7162 	case -NFS4ERR_OLD_STATEID:
7163 	case -NFS4ERR_STALE_STATEID:
7164 	case -NFS4ERR_EXPIRED:
7165 		if (data->arg.new_lock_owner != 0) {
7166 			if (!nfs4_stateid_match(&data->arg.open_stateid,
7167 						&lsp->ls_state->open_stateid))
7168 				goto out_restart;
7169 		} else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7170 						&lsp->ls_stateid))
7171 				goto out_restart;
7172 	}
7173 out_done:
7174 	dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7175 	return;
7176 out_restart:
7177 	if (!data->cancelled)
7178 		rpc_restart_call_prepare(task);
7179 	goto out_done;
7180 }
7181 
nfs4_lock_release(void * calldata)7182 static void nfs4_lock_release(void *calldata)
7183 {
7184 	struct nfs4_lockdata *data = calldata;
7185 
7186 	nfs_free_seqid(data->arg.open_seqid);
7187 	if (data->cancelled && data->rpc_status == 0) {
7188 		struct rpc_task *task;
7189 		task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7190 				data->arg.lock_seqid);
7191 		if (!IS_ERR(task))
7192 			rpc_put_task_async(task);
7193 		dprintk("%s: cancelling lock!\n", __func__);
7194 	} else
7195 		nfs_free_seqid(data->arg.lock_seqid);
7196 	nfs4_put_lock_state(data->lsp);
7197 	put_nfs_open_context(data->ctx);
7198 	kfree(data);
7199 }
7200 
7201 static const struct rpc_call_ops nfs4_lock_ops = {
7202 	.rpc_call_prepare = nfs4_lock_prepare,
7203 	.rpc_call_done = nfs4_lock_done,
7204 	.rpc_release = nfs4_lock_release,
7205 };
7206 
nfs4_handle_setlk_error(struct nfs_server * server,struct nfs4_lock_state * lsp,int new_lock_owner,int error)7207 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7208 {
7209 	switch (error) {
7210 	case -NFS4ERR_ADMIN_REVOKED:
7211 	case -NFS4ERR_EXPIRED:
7212 	case -NFS4ERR_BAD_STATEID:
7213 		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7214 		if (new_lock_owner != 0 ||
7215 		   test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7216 			nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7217 		break;
7218 	case -NFS4ERR_STALE_STATEID:
7219 		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7220 		nfs4_schedule_lease_recovery(server->nfs_client);
7221 	}
7222 }
7223 
_nfs4_do_setlk(struct nfs4_state * state,int cmd,struct file_lock * fl,int recovery_type)7224 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7225 {
7226 	struct nfs4_lockdata *data;
7227 	struct rpc_task *task;
7228 	struct rpc_message msg = {
7229 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7230 		.rpc_cred = state->owner->so_cred,
7231 	};
7232 	struct rpc_task_setup task_setup_data = {
7233 		.rpc_client = NFS_CLIENT(state->inode),
7234 		.rpc_message = &msg,
7235 		.callback_ops = &nfs4_lock_ops,
7236 		.workqueue = nfsiod_workqueue,
7237 		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7238 	};
7239 	int ret;
7240 
7241 	if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7242 		task_setup_data.flags |= RPC_TASK_MOVEABLE;
7243 
7244 	data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7245 				   fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7246 	if (data == NULL)
7247 		return -ENOMEM;
7248 	if (IS_SETLKW(cmd))
7249 		data->arg.block = 1;
7250 	nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7251 				recovery_type > NFS_LOCK_NEW);
7252 	msg.rpc_argp = &data->arg;
7253 	msg.rpc_resp = &data->res;
7254 	task_setup_data.callback_data = data;
7255 	if (recovery_type > NFS_LOCK_NEW) {
7256 		if (recovery_type == NFS_LOCK_RECLAIM)
7257 			data->arg.reclaim = NFS_LOCK_RECLAIM;
7258 	} else
7259 		data->arg.new_lock = 1;
7260 	task = rpc_run_task(&task_setup_data);
7261 	if (IS_ERR(task))
7262 		return PTR_ERR(task);
7263 	ret = rpc_wait_for_completion_task(task);
7264 	if (ret == 0) {
7265 		ret = data->rpc_status;
7266 		if (ret)
7267 			nfs4_handle_setlk_error(data->server, data->lsp,
7268 					data->arg.new_lock_owner, ret);
7269 	} else
7270 		data->cancelled = true;
7271 	trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7272 	rpc_put_task(task);
7273 	dprintk("%s: ret = %d\n", __func__, ret);
7274 	return ret;
7275 }
7276 
nfs4_lock_reclaim(struct nfs4_state * state,struct file_lock * request)7277 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7278 {
7279 	struct nfs_server *server = NFS_SERVER(state->inode);
7280 	struct nfs4_exception exception = {
7281 		.inode = state->inode,
7282 	};
7283 	int err;
7284 
7285 	do {
7286 		/* Cache the lock if possible... */
7287 		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7288 			return 0;
7289 		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7290 		if (err != -NFS4ERR_DELAY)
7291 			break;
7292 		nfs4_handle_exception(server, err, &exception);
7293 	} while (exception.retry);
7294 	return err;
7295 }
7296 
nfs4_lock_expired(struct nfs4_state * state,struct file_lock * request)7297 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7298 {
7299 	struct nfs_server *server = NFS_SERVER(state->inode);
7300 	struct nfs4_exception exception = {
7301 		.inode = state->inode,
7302 	};
7303 	int err;
7304 
7305 	err = nfs4_set_lock_state(state, request);
7306 	if (err != 0)
7307 		return err;
7308 	if (!recover_lost_locks) {
7309 		set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7310 		return 0;
7311 	}
7312 	do {
7313 		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7314 			return 0;
7315 		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7316 		switch (err) {
7317 		default:
7318 			goto out;
7319 		case -NFS4ERR_GRACE:
7320 		case -NFS4ERR_DELAY:
7321 			nfs4_handle_exception(server, err, &exception);
7322 			err = 0;
7323 		}
7324 	} while (exception.retry);
7325 out:
7326 	return err;
7327 }
7328 
7329 #if defined(CONFIG_NFS_V4_1)
nfs41_lock_expired(struct nfs4_state * state,struct file_lock * request)7330 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7331 {
7332 	struct nfs4_lock_state *lsp;
7333 	int status;
7334 
7335 	status = nfs4_set_lock_state(state, request);
7336 	if (status != 0)
7337 		return status;
7338 	lsp = request->fl_u.nfs4_fl.owner;
7339 	if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7340 	    test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7341 		return 0;
7342 	return nfs4_lock_expired(state, request);
7343 }
7344 #endif
7345 
_nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7346 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7347 {
7348 	struct nfs_inode *nfsi = NFS_I(state->inode);
7349 	struct nfs4_state_owner *sp = state->owner;
7350 	unsigned char fl_flags = request->fl_flags;
7351 	int status;
7352 
7353 	request->fl_flags |= FL_ACCESS;
7354 	status = locks_lock_inode_wait(state->inode, request);
7355 	if (status < 0)
7356 		goto out;
7357 	mutex_lock(&sp->so_delegreturn_mutex);
7358 	down_read(&nfsi->rwsem);
7359 	if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7360 		/* Yes: cache locks! */
7361 		/* ...but avoid races with delegation recall... */
7362 		request->fl_flags = fl_flags & ~FL_SLEEP;
7363 		status = locks_lock_inode_wait(state->inode, request);
7364 		up_read(&nfsi->rwsem);
7365 		mutex_unlock(&sp->so_delegreturn_mutex);
7366 		goto out;
7367 	}
7368 	up_read(&nfsi->rwsem);
7369 	mutex_unlock(&sp->so_delegreturn_mutex);
7370 	status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7371 out:
7372 	request->fl_flags = fl_flags;
7373 	return status;
7374 }
7375 
nfs4_proc_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7376 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7377 {
7378 	struct nfs4_exception exception = {
7379 		.state = state,
7380 		.inode = state->inode,
7381 		.interruptible = true,
7382 	};
7383 	int err;
7384 
7385 	do {
7386 		err = _nfs4_proc_setlk(state, cmd, request);
7387 		if (err == -NFS4ERR_DENIED)
7388 			err = -EAGAIN;
7389 		err = nfs4_handle_exception(NFS_SERVER(state->inode),
7390 				err, &exception);
7391 	} while (exception.retry);
7392 	return err;
7393 }
7394 
7395 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7396 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7397 
7398 static int
nfs4_retry_setlk_simple(struct nfs4_state * state,int cmd,struct file_lock * request)7399 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7400 			struct file_lock *request)
7401 {
7402 	int		status = -ERESTARTSYS;
7403 	unsigned long	timeout = NFS4_LOCK_MINTIMEOUT;
7404 
7405 	while(!signalled()) {
7406 		status = nfs4_proc_setlk(state, cmd, request);
7407 		if ((status != -EAGAIN) || IS_SETLK(cmd))
7408 			break;
7409 		freezable_schedule_timeout_interruptible(timeout);
7410 		timeout *= 2;
7411 		timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7412 		status = -ERESTARTSYS;
7413 	}
7414 	return status;
7415 }
7416 
7417 #ifdef CONFIG_NFS_V4_1
7418 struct nfs4_lock_waiter {
7419 	struct inode		*inode;
7420 	struct nfs_lowner	owner;
7421 	wait_queue_entry_t	wait;
7422 };
7423 
7424 static int
nfs4_wake_lock_waiter(wait_queue_entry_t * wait,unsigned int mode,int flags,void * key)7425 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7426 {
7427 	struct nfs4_lock_waiter	*waiter	=
7428 		container_of(wait, struct nfs4_lock_waiter, wait);
7429 
7430 	/* NULL key means to wake up everyone */
7431 	if (key) {
7432 		struct cb_notify_lock_args	*cbnl = key;
7433 		struct nfs_lowner		*lowner = &cbnl->cbnl_owner,
7434 						*wowner = &waiter->owner;
7435 
7436 		/* Only wake if the callback was for the same owner. */
7437 		if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7438 			return 0;
7439 
7440 		/* Make sure it's for the right inode */
7441 		if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7442 			return 0;
7443 	}
7444 
7445 	return woken_wake_function(wait, mode, flags, key);
7446 }
7447 
7448 static int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7449 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7450 {
7451 	struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7452 	struct nfs_server *server = NFS_SERVER(state->inode);
7453 	struct nfs_client *clp = server->nfs_client;
7454 	wait_queue_head_t *q = &clp->cl_lock_waitq;
7455 	struct nfs4_lock_waiter waiter = {
7456 		.inode = state->inode,
7457 		.owner = { .clientid = clp->cl_clientid,
7458 			   .id = lsp->ls_seqid.owner_id,
7459 			   .s_dev = server->s_dev },
7460 	};
7461 	int status;
7462 
7463 	/* Don't bother with waitqueue if we don't expect a callback */
7464 	if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7465 		return nfs4_retry_setlk_simple(state, cmd, request);
7466 
7467 	init_wait(&waiter.wait);
7468 	waiter.wait.func = nfs4_wake_lock_waiter;
7469 	add_wait_queue(q, &waiter.wait);
7470 
7471 	do {
7472 		status = nfs4_proc_setlk(state, cmd, request);
7473 		if (status != -EAGAIN || IS_SETLK(cmd))
7474 			break;
7475 
7476 		status = -ERESTARTSYS;
7477 		freezer_do_not_count();
7478 		wait_woken(&waiter.wait, TASK_INTERRUPTIBLE,
7479 			   NFS4_LOCK_MAXTIMEOUT);
7480 		freezer_count();
7481 	} while (!signalled());
7482 
7483 	remove_wait_queue(q, &waiter.wait);
7484 
7485 	return status;
7486 }
7487 #else /* !CONFIG_NFS_V4_1 */
7488 static inline int
nfs4_retry_setlk(struct nfs4_state * state,int cmd,struct file_lock * request)7489 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7490 {
7491 	return nfs4_retry_setlk_simple(state, cmd, request);
7492 }
7493 #endif
7494 
7495 static int
nfs4_proc_lock(struct file * filp,int cmd,struct file_lock * request)7496 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7497 {
7498 	struct nfs_open_context *ctx;
7499 	struct nfs4_state *state;
7500 	int status;
7501 
7502 	/* verify open state */
7503 	ctx = nfs_file_open_context(filp);
7504 	state = ctx->state;
7505 
7506 	if (IS_GETLK(cmd)) {
7507 		if (state != NULL)
7508 			return nfs4_proc_getlk(state, F_GETLK, request);
7509 		return 0;
7510 	}
7511 
7512 	if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7513 		return -EINVAL;
7514 
7515 	if (request->fl_type == F_UNLCK) {
7516 		if (state != NULL)
7517 			return nfs4_proc_unlck(state, cmd, request);
7518 		return 0;
7519 	}
7520 
7521 	if (state == NULL)
7522 		return -ENOLCK;
7523 
7524 	if ((request->fl_flags & FL_POSIX) &&
7525 	    !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7526 		return -ENOLCK;
7527 
7528 	/*
7529 	 * Don't rely on the VFS having checked the file open mode,
7530 	 * since it won't do this for flock() locks.
7531 	 */
7532 	switch (request->fl_type) {
7533 	case F_RDLCK:
7534 		if (!(filp->f_mode & FMODE_READ))
7535 			return -EBADF;
7536 		break;
7537 	case F_WRLCK:
7538 		if (!(filp->f_mode & FMODE_WRITE))
7539 			return -EBADF;
7540 	}
7541 
7542 	status = nfs4_set_lock_state(state, request);
7543 	if (status != 0)
7544 		return status;
7545 
7546 	return nfs4_retry_setlk(state, cmd, request);
7547 }
7548 
nfs4_delete_lease(struct file * file,void ** priv)7549 static int nfs4_delete_lease(struct file *file, void **priv)
7550 {
7551 	return generic_setlease(file, F_UNLCK, NULL, priv);
7552 }
7553 
nfs4_add_lease(struct file * file,long arg,struct file_lock ** lease,void ** priv)7554 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease,
7555 			  void **priv)
7556 {
7557 	struct inode *inode = file_inode(file);
7558 	fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7559 	int ret;
7560 
7561 	/* No delegation, no lease */
7562 	if (!nfs4_have_delegation(inode, type))
7563 		return -EAGAIN;
7564 	ret = generic_setlease(file, arg, lease, priv);
7565 	if (ret || nfs4_have_delegation(inode, type))
7566 		return ret;
7567 	/* We raced with a delegation return */
7568 	nfs4_delete_lease(file, priv);
7569 	return -EAGAIN;
7570 }
7571 
nfs4_proc_setlease(struct file * file,long arg,struct file_lock ** lease,void ** priv)7572 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease,
7573 		       void **priv)
7574 {
7575 	switch (arg) {
7576 	case F_RDLCK:
7577 	case F_WRLCK:
7578 		return nfs4_add_lease(file, arg, lease, priv);
7579 	case F_UNLCK:
7580 		return nfs4_delete_lease(file, priv);
7581 	default:
7582 		return -EINVAL;
7583 	}
7584 }
7585 
nfs4_lock_delegation_recall(struct file_lock * fl,struct nfs4_state * state,const nfs4_stateid * stateid)7586 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7587 {
7588 	struct nfs_server *server = NFS_SERVER(state->inode);
7589 	int err;
7590 
7591 	err = nfs4_set_lock_state(state, fl);
7592 	if (err != 0)
7593 		return err;
7594 	do {
7595 		err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7596 		if (err != -NFS4ERR_DELAY)
7597 			break;
7598 		ssleep(1);
7599 	} while (err == -NFS4ERR_DELAY);
7600 	return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7601 }
7602 
7603 struct nfs_release_lockowner_data {
7604 	struct nfs4_lock_state *lsp;
7605 	struct nfs_server *server;
7606 	struct nfs_release_lockowner_args args;
7607 	struct nfs_release_lockowner_res res;
7608 	unsigned long timestamp;
7609 };
7610 
nfs4_release_lockowner_prepare(struct rpc_task * task,void * calldata)7611 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7612 {
7613 	struct nfs_release_lockowner_data *data = calldata;
7614 	struct nfs_server *server = data->server;
7615 	nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7616 			   &data->res.seq_res, task);
7617 	data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7618 	data->timestamp = jiffies;
7619 }
7620 
nfs4_release_lockowner_done(struct rpc_task * task,void * calldata)7621 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7622 {
7623 	struct nfs_release_lockowner_data *data = calldata;
7624 	struct nfs_server *server = data->server;
7625 
7626 	nfs40_sequence_done(task, &data->res.seq_res);
7627 
7628 	switch (task->tk_status) {
7629 	case 0:
7630 		renew_lease(server, data->timestamp);
7631 		break;
7632 	case -NFS4ERR_STALE_CLIENTID:
7633 	case -NFS4ERR_EXPIRED:
7634 		nfs4_schedule_lease_recovery(server->nfs_client);
7635 		break;
7636 	case -NFS4ERR_LEASE_MOVED:
7637 	case -NFS4ERR_DELAY:
7638 		if (nfs4_async_handle_error(task, server,
7639 					    NULL, NULL) == -EAGAIN)
7640 			rpc_restart_call_prepare(task);
7641 	}
7642 }
7643 
nfs4_release_lockowner_release(void * calldata)7644 static void nfs4_release_lockowner_release(void *calldata)
7645 {
7646 	struct nfs_release_lockowner_data *data = calldata;
7647 	nfs4_free_lock_state(data->server, data->lsp);
7648 	kfree(calldata);
7649 }
7650 
7651 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7652 	.rpc_call_prepare = nfs4_release_lockowner_prepare,
7653 	.rpc_call_done = nfs4_release_lockowner_done,
7654 	.rpc_release = nfs4_release_lockowner_release,
7655 };
7656 
7657 static void
nfs4_release_lockowner(struct nfs_server * server,struct nfs4_lock_state * lsp)7658 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7659 {
7660 	struct nfs_release_lockowner_data *data;
7661 	struct rpc_message msg = {
7662 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7663 	};
7664 
7665 	if (server->nfs_client->cl_mvops->minor_version != 0)
7666 		return;
7667 
7668 	data = kmalloc(sizeof(*data), GFP_KERNEL);
7669 	if (!data)
7670 		return;
7671 	data->lsp = lsp;
7672 	data->server = server;
7673 	data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7674 	data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7675 	data->args.lock_owner.s_dev = server->s_dev;
7676 
7677 	msg.rpc_argp = &data->args;
7678 	msg.rpc_resp = &data->res;
7679 	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7680 	rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7681 }
7682 
7683 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7684 
nfs4_xattr_set_nfs4_acl(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7685 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7686 				   struct user_namespace *mnt_userns,
7687 				   struct dentry *unused, struct inode *inode,
7688 				   const char *key, const void *buf,
7689 				   size_t buflen, int flags)
7690 {
7691 	return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7692 }
7693 
nfs4_xattr_get_nfs4_acl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7694 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7695 				   struct dentry *unused, struct inode *inode,
7696 				   const char *key, void *buf, size_t buflen)
7697 {
7698 	return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7699 }
7700 
nfs4_xattr_list_nfs4_acl(struct dentry * dentry)7701 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7702 {
7703 	return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7704 }
7705 
7706 #if defined(CONFIG_NFS_V4_1)
7707 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7708 
nfs4_xattr_set_nfs4_dacl(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7709 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7710 				    struct user_namespace *mnt_userns,
7711 				    struct dentry *unused, struct inode *inode,
7712 				    const char *key, const void *buf,
7713 				    size_t buflen, int flags)
7714 {
7715 	return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7716 }
7717 
nfs4_xattr_get_nfs4_dacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7718 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7719 				    struct dentry *unused, struct inode *inode,
7720 				    const char *key, void *buf, size_t buflen)
7721 {
7722 	return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7723 }
7724 
nfs4_xattr_list_nfs4_dacl(struct dentry * dentry)7725 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7726 {
7727 	return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7728 }
7729 
7730 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7731 
nfs4_xattr_set_nfs4_sacl(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7732 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7733 				    struct user_namespace *mnt_userns,
7734 				    struct dentry *unused, struct inode *inode,
7735 				    const char *key, const void *buf,
7736 				    size_t buflen, int flags)
7737 {
7738 	return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7739 }
7740 
nfs4_xattr_get_nfs4_sacl(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7741 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7742 				    struct dentry *unused, struct inode *inode,
7743 				    const char *key, void *buf, size_t buflen)
7744 {
7745 	return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7746 }
7747 
nfs4_xattr_list_nfs4_sacl(struct dentry * dentry)7748 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7749 {
7750 	return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7751 }
7752 
7753 #endif
7754 
7755 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7756 
nfs4_xattr_set_nfs4_label(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7757 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7758 				     struct user_namespace *mnt_userns,
7759 				     struct dentry *unused, struct inode *inode,
7760 				     const char *key, const void *buf,
7761 				     size_t buflen, int flags)
7762 {
7763 	if (security_ismaclabel(key))
7764 		return nfs4_set_security_label(inode, buf, buflen);
7765 
7766 	return -EOPNOTSUPP;
7767 }
7768 
nfs4_xattr_get_nfs4_label(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7769 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7770 				     struct dentry *unused, struct inode *inode,
7771 				     const char *key, void *buf, size_t buflen)
7772 {
7773 	if (security_ismaclabel(key))
7774 		return nfs4_get_security_label(inode, buf, buflen);
7775 	return -EOPNOTSUPP;
7776 }
7777 
7778 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)7779 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7780 {
7781 	int len = 0;
7782 
7783 	if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7784 		len = security_inode_listsecurity(inode, list, list_len);
7785 		if (len >= 0 && list_len && len > list_len)
7786 			return -ERANGE;
7787 	}
7788 	return len;
7789 }
7790 
7791 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7792 	.prefix = XATTR_SECURITY_PREFIX,
7793 	.get	= nfs4_xattr_get_nfs4_label,
7794 	.set	= nfs4_xattr_set_nfs4_label,
7795 };
7796 
7797 #else
7798 
7799 static ssize_t
nfs4_listxattr_nfs4_label(struct inode * inode,char * list,size_t list_len)7800 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7801 {
7802 	return 0;
7803 }
7804 
7805 #endif
7806 
7807 #ifdef CONFIG_NFS_V4_2
nfs4_xattr_set_nfs4_user(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * key,const void * buf,size_t buflen,int flags)7808 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7809 				    struct user_namespace *mnt_userns,
7810 				    struct dentry *unused, struct inode *inode,
7811 				    const char *key, const void *buf,
7812 				    size_t buflen, int flags)
7813 {
7814 	u32 mask;
7815 	int ret;
7816 
7817 	if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7818 		return -EOPNOTSUPP;
7819 
7820 	/*
7821 	 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7822 	 * flags right now. Handling of xattr operations use the normal
7823 	 * file read/write permissions.
7824 	 *
7825 	 * Just in case the server has other ideas (which RFC 8276 allows),
7826 	 * do a cached access check for the XA* flags to possibly avoid
7827 	 * doing an RPC and getting EACCES back.
7828 	 */
7829 	if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7830 		if (!(mask & NFS_ACCESS_XAWRITE))
7831 			return -EACCES;
7832 	}
7833 
7834 	if (buf == NULL) {
7835 		ret = nfs42_proc_removexattr(inode, key);
7836 		if (!ret)
7837 			nfs4_xattr_cache_remove(inode, key);
7838 	} else {
7839 		ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7840 		if (!ret)
7841 			nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7842 	}
7843 
7844 	return ret;
7845 }
7846 
nfs4_xattr_get_nfs4_user(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * key,void * buf,size_t buflen)7847 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7848 				    struct dentry *unused, struct inode *inode,
7849 				    const char *key, void *buf, size_t buflen)
7850 {
7851 	u32 mask;
7852 	ssize_t ret;
7853 
7854 	if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7855 		return -EOPNOTSUPP;
7856 
7857 	if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7858 		if (!(mask & NFS_ACCESS_XAREAD))
7859 			return -EACCES;
7860 	}
7861 
7862 	ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7863 	if (ret)
7864 		return ret;
7865 
7866 	ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7867 	if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7868 		return ret;
7869 
7870 	ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7871 
7872 	return ret;
7873 }
7874 
7875 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)7876 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7877 {
7878 	u64 cookie;
7879 	bool eof;
7880 	ssize_t ret, size;
7881 	char *buf;
7882 	size_t buflen;
7883 	u32 mask;
7884 
7885 	if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7886 		return 0;
7887 
7888 	if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7889 		if (!(mask & NFS_ACCESS_XALIST))
7890 			return 0;
7891 	}
7892 
7893 	ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7894 	if (ret)
7895 		return ret;
7896 
7897 	ret = nfs4_xattr_cache_list(inode, list, list_len);
7898 	if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7899 		return ret;
7900 
7901 	cookie = 0;
7902 	eof = false;
7903 	buflen = list_len ? list_len : XATTR_LIST_MAX;
7904 	buf = list_len ? list : NULL;
7905 	size = 0;
7906 
7907 	while (!eof) {
7908 		ret = nfs42_proc_listxattrs(inode, buf, buflen,
7909 		    &cookie, &eof);
7910 		if (ret < 0)
7911 			return ret;
7912 
7913 		if (list_len) {
7914 			buf += ret;
7915 			buflen -= ret;
7916 		}
7917 		size += ret;
7918 	}
7919 
7920 	if (list_len)
7921 		nfs4_xattr_cache_set_list(inode, list, size);
7922 
7923 	return size;
7924 }
7925 
7926 #else
7927 
7928 static ssize_t
nfs4_listxattr_nfs4_user(struct inode * inode,char * list,size_t list_len)7929 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7930 {
7931 	return 0;
7932 }
7933 #endif /* CONFIG_NFS_V4_2 */
7934 
7935 /*
7936  * nfs_fhget will use either the mounted_on_fileid or the fileid
7937  */
nfs_fixup_referral_attributes(struct nfs_fattr * fattr)7938 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7939 {
7940 	if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7941 	       (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7942 	      (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7943 	      (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7944 		return;
7945 
7946 	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7947 		NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7948 	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7949 	fattr->nlink = 2;
7950 }
7951 
_nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)7952 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7953 				   const struct qstr *name,
7954 				   struct nfs4_fs_locations *fs_locations,
7955 				   struct page *page)
7956 {
7957 	struct nfs_server *server = NFS_SERVER(dir);
7958 	u32 bitmask[3];
7959 	struct nfs4_fs_locations_arg args = {
7960 		.dir_fh = NFS_FH(dir),
7961 		.name = name,
7962 		.page = page,
7963 		.bitmask = bitmask,
7964 	};
7965 	struct nfs4_fs_locations_res res = {
7966 		.fs_locations = fs_locations,
7967 	};
7968 	struct rpc_message msg = {
7969 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7970 		.rpc_argp = &args,
7971 		.rpc_resp = &res,
7972 	};
7973 	int status;
7974 
7975 	dprintk("%s: start\n", __func__);
7976 
7977 	bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7978 	bitmask[1] = nfs4_fattr_bitmap[1];
7979 
7980 	/* Ask for the fileid of the absent filesystem if mounted_on_fileid
7981 	 * is not supported */
7982 	if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7983 		bitmask[0] &= ~FATTR4_WORD0_FILEID;
7984 	else
7985 		bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7986 
7987 	nfs_fattr_init(fs_locations->fattr);
7988 	fs_locations->server = server;
7989 	fs_locations->nlocations = 0;
7990 	status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7991 	dprintk("%s: returned status = %d\n", __func__, status);
7992 	return status;
7993 }
7994 
nfs4_proc_fs_locations(struct rpc_clnt * client,struct inode * dir,const struct qstr * name,struct nfs4_fs_locations * fs_locations,struct page * page)7995 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7996 			   const struct qstr *name,
7997 			   struct nfs4_fs_locations *fs_locations,
7998 			   struct page *page)
7999 {
8000 	struct nfs4_exception exception = {
8001 		.interruptible = true,
8002 	};
8003 	int err;
8004 	do {
8005 		err = _nfs4_proc_fs_locations(client, dir, name,
8006 				fs_locations, page);
8007 		trace_nfs4_get_fs_locations(dir, name, err);
8008 		err = nfs4_handle_exception(NFS_SERVER(dir), err,
8009 				&exception);
8010 	} while (exception.retry);
8011 	return err;
8012 }
8013 
8014 /*
8015  * This operation also signals the server that this client is
8016  * performing migration recovery.  The server can stop returning
8017  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8018  * appended to this compound to identify the client ID which is
8019  * performing recovery.
8020  */
_nfs40_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8021 static int _nfs40_proc_get_locations(struct nfs_server *server,
8022 				     struct nfs_fh *fhandle,
8023 				     struct nfs4_fs_locations *locations,
8024 				     struct page *page, const struct cred *cred)
8025 {
8026 	struct rpc_clnt *clnt = server->client;
8027 	u32 bitmask[2] = {
8028 		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8029 	};
8030 	struct nfs4_fs_locations_arg args = {
8031 		.clientid	= server->nfs_client->cl_clientid,
8032 		.fh		= fhandle,
8033 		.page		= page,
8034 		.bitmask	= bitmask,
8035 		.migration	= 1,		/* skip LOOKUP */
8036 		.renew		= 1,		/* append RENEW */
8037 	};
8038 	struct nfs4_fs_locations_res res = {
8039 		.fs_locations	= locations,
8040 		.migration	= 1,
8041 		.renew		= 1,
8042 	};
8043 	struct rpc_message msg = {
8044 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8045 		.rpc_argp	= &args,
8046 		.rpc_resp	= &res,
8047 		.rpc_cred	= cred,
8048 	};
8049 	unsigned long now = jiffies;
8050 	int status;
8051 
8052 	nfs_fattr_init(locations->fattr);
8053 	locations->server = server;
8054 	locations->nlocations = 0;
8055 
8056 	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8057 	status = nfs4_call_sync_sequence(clnt, server, &msg,
8058 					&args.seq_args, &res.seq_res);
8059 	if (status)
8060 		return status;
8061 
8062 	renew_lease(server, now);
8063 	return 0;
8064 }
8065 
8066 #ifdef CONFIG_NFS_V4_1
8067 
8068 /*
8069  * This operation also signals the server that this client is
8070  * performing migration recovery.  The server can stop asserting
8071  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8072  * performing this operation is identified in the SEQUENCE
8073  * operation in this compound.
8074  *
8075  * When the client supports GETATTR(fs_locations_info), it can
8076  * be plumbed in here.
8077  */
_nfs41_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8078 static int _nfs41_proc_get_locations(struct nfs_server *server,
8079 				     struct nfs_fh *fhandle,
8080 				     struct nfs4_fs_locations *locations,
8081 				     struct page *page, const struct cred *cred)
8082 {
8083 	struct rpc_clnt *clnt = server->client;
8084 	u32 bitmask[2] = {
8085 		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8086 	};
8087 	struct nfs4_fs_locations_arg args = {
8088 		.fh		= fhandle,
8089 		.page		= page,
8090 		.bitmask	= bitmask,
8091 		.migration	= 1,		/* skip LOOKUP */
8092 	};
8093 	struct nfs4_fs_locations_res res = {
8094 		.fs_locations	= locations,
8095 		.migration	= 1,
8096 	};
8097 	struct rpc_message msg = {
8098 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8099 		.rpc_argp	= &args,
8100 		.rpc_resp	= &res,
8101 		.rpc_cred	= cred,
8102 	};
8103 	struct nfs4_call_sync_data data = {
8104 		.seq_server = server,
8105 		.seq_args = &args.seq_args,
8106 		.seq_res = &res.seq_res,
8107 	};
8108 	struct rpc_task_setup task_setup_data = {
8109 		.rpc_client = clnt,
8110 		.rpc_message = &msg,
8111 		.callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8112 		.callback_data = &data,
8113 		.flags = RPC_TASK_NO_ROUND_ROBIN,
8114 	};
8115 	int status;
8116 
8117 	nfs_fattr_init(locations->fattr);
8118 	locations->server = server;
8119 	locations->nlocations = 0;
8120 
8121 	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8122 	status = nfs4_call_sync_custom(&task_setup_data);
8123 	if (status == NFS4_OK &&
8124 	    res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8125 		status = -NFS4ERR_LEASE_MOVED;
8126 	return status;
8127 }
8128 
8129 #endif	/* CONFIG_NFS_V4_1 */
8130 
8131 /**
8132  * nfs4_proc_get_locations - discover locations for a migrated FSID
8133  * @server: pointer to nfs_server to process
8134  * @fhandle: pointer to the kernel NFS client file handle
8135  * @locations: result of query
8136  * @page: buffer
8137  * @cred: credential to use for this operation
8138  *
8139  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8140  * operation failed, or a negative errno if a local error occurred.
8141  *
8142  * On success, "locations" is filled in, but if the server has
8143  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8144  * asserted.
8145  *
8146  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8147  * from this client that require migration recovery.
8148  */
nfs4_proc_get_locations(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs4_fs_locations * locations,struct page * page,const struct cred * cred)8149 int nfs4_proc_get_locations(struct nfs_server *server,
8150 			    struct nfs_fh *fhandle,
8151 			    struct nfs4_fs_locations *locations,
8152 			    struct page *page, const struct cred *cred)
8153 {
8154 	struct nfs_client *clp = server->nfs_client;
8155 	const struct nfs4_mig_recovery_ops *ops =
8156 					clp->cl_mvops->mig_recovery_ops;
8157 	struct nfs4_exception exception = {
8158 		.interruptible = true,
8159 	};
8160 	int status;
8161 
8162 	dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8163 		(unsigned long long)server->fsid.major,
8164 		(unsigned long long)server->fsid.minor,
8165 		clp->cl_hostname);
8166 	nfs_display_fhandle(fhandle, __func__);
8167 
8168 	do {
8169 		status = ops->get_locations(server, fhandle, locations, page,
8170 					    cred);
8171 		if (status != -NFS4ERR_DELAY)
8172 			break;
8173 		nfs4_handle_exception(server, status, &exception);
8174 	} while (exception.retry);
8175 	return status;
8176 }
8177 
8178 /*
8179  * This operation also signals the server that this client is
8180  * performing "lease moved" recovery.  The server can stop
8181  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8182  * is appended to this compound to identify the client ID which is
8183  * performing recovery.
8184  */
_nfs40_proc_fsid_present(struct inode * inode,const struct cred * cred)8185 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8186 {
8187 	struct nfs_server *server = NFS_SERVER(inode);
8188 	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8189 	struct rpc_clnt *clnt = server->client;
8190 	struct nfs4_fsid_present_arg args = {
8191 		.fh		= NFS_FH(inode),
8192 		.clientid	= clp->cl_clientid,
8193 		.renew		= 1,		/* append RENEW */
8194 	};
8195 	struct nfs4_fsid_present_res res = {
8196 		.renew		= 1,
8197 	};
8198 	struct rpc_message msg = {
8199 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8200 		.rpc_argp	= &args,
8201 		.rpc_resp	= &res,
8202 		.rpc_cred	= cred,
8203 	};
8204 	unsigned long now = jiffies;
8205 	int status;
8206 
8207 	res.fh = nfs_alloc_fhandle();
8208 	if (res.fh == NULL)
8209 		return -ENOMEM;
8210 
8211 	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8212 	status = nfs4_call_sync_sequence(clnt, server, &msg,
8213 						&args.seq_args, &res.seq_res);
8214 	nfs_free_fhandle(res.fh);
8215 	if (status)
8216 		return status;
8217 
8218 	do_renew_lease(clp, now);
8219 	return 0;
8220 }
8221 
8222 #ifdef CONFIG_NFS_V4_1
8223 
8224 /*
8225  * This operation also signals the server that this client is
8226  * performing "lease moved" recovery.  The server can stop asserting
8227  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8228  * this operation is identified in the SEQUENCE operation in this
8229  * compound.
8230  */
_nfs41_proc_fsid_present(struct inode * inode,const struct cred * cred)8231 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8232 {
8233 	struct nfs_server *server = NFS_SERVER(inode);
8234 	struct rpc_clnt *clnt = server->client;
8235 	struct nfs4_fsid_present_arg args = {
8236 		.fh		= NFS_FH(inode),
8237 	};
8238 	struct nfs4_fsid_present_res res = {
8239 	};
8240 	struct rpc_message msg = {
8241 		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8242 		.rpc_argp	= &args,
8243 		.rpc_resp	= &res,
8244 		.rpc_cred	= cred,
8245 	};
8246 	int status;
8247 
8248 	res.fh = nfs_alloc_fhandle();
8249 	if (res.fh == NULL)
8250 		return -ENOMEM;
8251 
8252 	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8253 	status = nfs4_call_sync_sequence(clnt, server, &msg,
8254 						&args.seq_args, &res.seq_res);
8255 	nfs_free_fhandle(res.fh);
8256 	if (status == NFS4_OK &&
8257 	    res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8258 		status = -NFS4ERR_LEASE_MOVED;
8259 	return status;
8260 }
8261 
8262 #endif	/* CONFIG_NFS_V4_1 */
8263 
8264 /**
8265  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8266  * @inode: inode on FSID to check
8267  * @cred: credential to use for this operation
8268  *
8269  * Server indicates whether the FSID is present, moved, or not
8270  * recognized.  This operation is necessary to clear a LEASE_MOVED
8271  * condition for this client ID.
8272  *
8273  * Returns NFS4_OK if the FSID is present on this server,
8274  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8275  *  NFS4ERR code if some error occurred on the server, or a
8276  *  negative errno if a local failure occurred.
8277  */
nfs4_proc_fsid_present(struct inode * inode,const struct cred * cred)8278 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8279 {
8280 	struct nfs_server *server = NFS_SERVER(inode);
8281 	struct nfs_client *clp = server->nfs_client;
8282 	const struct nfs4_mig_recovery_ops *ops =
8283 					clp->cl_mvops->mig_recovery_ops;
8284 	struct nfs4_exception exception = {
8285 		.interruptible = true,
8286 	};
8287 	int status;
8288 
8289 	dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8290 		(unsigned long long)server->fsid.major,
8291 		(unsigned long long)server->fsid.minor,
8292 		clp->cl_hostname);
8293 	nfs_display_fhandle(NFS_FH(inode), __func__);
8294 
8295 	do {
8296 		status = ops->fsid_present(inode, cred);
8297 		if (status != -NFS4ERR_DELAY)
8298 			break;
8299 		nfs4_handle_exception(server, status, &exception);
8300 	} while (exception.retry);
8301 	return status;
8302 }
8303 
8304 /*
8305  * If 'use_integrity' is true and the state managment nfs_client
8306  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8307  * and the machine credential as per RFC3530bis and RFC5661 Security
8308  * Considerations sections. Otherwise, just use the user cred with the
8309  * filesystem's rpc_client.
8310  */
_nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors,bool use_integrity)8311 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8312 {
8313 	int status;
8314 	struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8315 	struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8316 	struct nfs4_secinfo_arg args = {
8317 		.dir_fh = NFS_FH(dir),
8318 		.name   = name,
8319 	};
8320 	struct nfs4_secinfo_res res = {
8321 		.flavors     = flavors,
8322 	};
8323 	struct rpc_message msg = {
8324 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8325 		.rpc_argp = &args,
8326 		.rpc_resp = &res,
8327 	};
8328 	struct nfs4_call_sync_data data = {
8329 		.seq_server = NFS_SERVER(dir),
8330 		.seq_args = &args.seq_args,
8331 		.seq_res = &res.seq_res,
8332 	};
8333 	struct rpc_task_setup task_setup = {
8334 		.rpc_client = clnt,
8335 		.rpc_message = &msg,
8336 		.callback_ops = clp->cl_mvops->call_sync_ops,
8337 		.callback_data = &data,
8338 		.flags = RPC_TASK_NO_ROUND_ROBIN,
8339 	};
8340 	const struct cred *cred = NULL;
8341 
8342 	if (use_integrity) {
8343 		clnt = clp->cl_rpcclient;
8344 		task_setup.rpc_client = clnt;
8345 
8346 		cred = nfs4_get_clid_cred(clp);
8347 		msg.rpc_cred = cred;
8348 	}
8349 
8350 	dprintk("NFS call  secinfo %s\n", name->name);
8351 
8352 	nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8353 	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8354 	status = nfs4_call_sync_custom(&task_setup);
8355 
8356 	dprintk("NFS reply  secinfo: %d\n", status);
8357 
8358 	put_cred(cred);
8359 	return status;
8360 }
8361 
nfs4_proc_secinfo(struct inode * dir,const struct qstr * name,struct nfs4_secinfo_flavors * flavors)8362 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8363 		      struct nfs4_secinfo_flavors *flavors)
8364 {
8365 	struct nfs4_exception exception = {
8366 		.interruptible = true,
8367 	};
8368 	int err;
8369 	do {
8370 		err = -NFS4ERR_WRONGSEC;
8371 
8372 		/* try to use integrity protection with machine cred */
8373 		if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8374 			err = _nfs4_proc_secinfo(dir, name, flavors, true);
8375 
8376 		/*
8377 		 * if unable to use integrity protection, or SECINFO with
8378 		 * integrity protection returns NFS4ERR_WRONGSEC (which is
8379 		 * disallowed by spec, but exists in deployed servers) use
8380 		 * the current filesystem's rpc_client and the user cred.
8381 		 */
8382 		if (err == -NFS4ERR_WRONGSEC)
8383 			err = _nfs4_proc_secinfo(dir, name, flavors, false);
8384 
8385 		trace_nfs4_secinfo(dir, name, err);
8386 		err = nfs4_handle_exception(NFS_SERVER(dir), err,
8387 				&exception);
8388 	} while (exception.retry);
8389 	return err;
8390 }
8391 
8392 #ifdef CONFIG_NFS_V4_1
8393 /*
8394  * Check the exchange flags returned by the server for invalid flags, having
8395  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8396  * DS flags set.
8397  */
nfs4_check_cl_exchange_flags(u32 flags,u32 version)8398 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8399 {
8400 	if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8401 		goto out_inval;
8402 	else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8403 		goto out_inval;
8404 	if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8405 	    (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8406 		goto out_inval;
8407 	if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8408 		goto out_inval;
8409 	return NFS_OK;
8410 out_inval:
8411 	return -NFS4ERR_INVAL;
8412 }
8413 
8414 static bool
nfs41_same_server_scope(struct nfs41_server_scope * a,struct nfs41_server_scope * b)8415 nfs41_same_server_scope(struct nfs41_server_scope *a,
8416 			struct nfs41_server_scope *b)
8417 {
8418 	if (a->server_scope_sz != b->server_scope_sz)
8419 		return false;
8420 	return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8421 }
8422 
8423 static void
nfs4_bind_one_conn_to_session_done(struct rpc_task * task,void * calldata)8424 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8425 {
8426 	struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8427 	struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8428 	struct nfs_client *clp = args->client;
8429 
8430 	switch (task->tk_status) {
8431 	case -NFS4ERR_BADSESSION:
8432 	case -NFS4ERR_DEADSESSION:
8433 		nfs4_schedule_session_recovery(clp->cl_session,
8434 				task->tk_status);
8435 		return;
8436 	}
8437 	if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8438 			res->dir != NFS4_CDFS4_BOTH) {
8439 		rpc_task_close_connection(task);
8440 		if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8441 			rpc_restart_call(task);
8442 	}
8443 }
8444 
8445 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8446 	.rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8447 };
8448 
8449 /*
8450  * nfs4_proc_bind_one_conn_to_session()
8451  *
8452  * The 4.1 client currently uses the same TCP connection for the
8453  * fore and backchannel.
8454  */
8455 static
nfs4_proc_bind_one_conn_to_session(struct rpc_clnt * clnt,struct rpc_xprt * xprt,struct nfs_client * clp,const struct cred * cred)8456 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8457 		struct rpc_xprt *xprt,
8458 		struct nfs_client *clp,
8459 		const struct cred *cred)
8460 {
8461 	int status;
8462 	struct nfs41_bind_conn_to_session_args args = {
8463 		.client = clp,
8464 		.dir = NFS4_CDFC4_FORE_OR_BOTH,
8465 		.retries = 0,
8466 	};
8467 	struct nfs41_bind_conn_to_session_res res;
8468 	struct rpc_message msg = {
8469 		.rpc_proc =
8470 			&nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8471 		.rpc_argp = &args,
8472 		.rpc_resp = &res,
8473 		.rpc_cred = cred,
8474 	};
8475 	struct rpc_task_setup task_setup_data = {
8476 		.rpc_client = clnt,
8477 		.rpc_xprt = xprt,
8478 		.callback_ops = &nfs4_bind_one_conn_to_session_ops,
8479 		.rpc_message = &msg,
8480 		.flags = RPC_TASK_TIMEOUT,
8481 	};
8482 	struct rpc_task *task;
8483 
8484 	nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8485 	if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8486 		args.dir = NFS4_CDFC4_FORE;
8487 
8488 	/* Do not set the backchannel flag unless this is clnt->cl_xprt */
8489 	if (xprt != rcu_access_pointer(clnt->cl_xprt))
8490 		args.dir = NFS4_CDFC4_FORE;
8491 
8492 	task = rpc_run_task(&task_setup_data);
8493 	if (!IS_ERR(task)) {
8494 		status = task->tk_status;
8495 		rpc_put_task(task);
8496 	} else
8497 		status = PTR_ERR(task);
8498 	trace_nfs4_bind_conn_to_session(clp, status);
8499 	if (status == 0) {
8500 		if (memcmp(res.sessionid.data,
8501 		    clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8502 			dprintk("NFS: %s: Session ID mismatch\n", __func__);
8503 			return -EIO;
8504 		}
8505 		if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8506 			dprintk("NFS: %s: Unexpected direction from server\n",
8507 				__func__);
8508 			return -EIO;
8509 		}
8510 		if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8511 			dprintk("NFS: %s: Server returned RDMA mode = true\n",
8512 				__func__);
8513 			return -EIO;
8514 		}
8515 	}
8516 
8517 	return status;
8518 }
8519 
8520 struct rpc_bind_conn_calldata {
8521 	struct nfs_client *clp;
8522 	const struct cred *cred;
8523 };
8524 
8525 static int
nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * calldata)8526 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8527 		struct rpc_xprt *xprt,
8528 		void *calldata)
8529 {
8530 	struct rpc_bind_conn_calldata *p = calldata;
8531 
8532 	return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8533 }
8534 
nfs4_proc_bind_conn_to_session(struct nfs_client * clp,const struct cred * cred)8535 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8536 {
8537 	struct rpc_bind_conn_calldata data = {
8538 		.clp = clp,
8539 		.cred = cred,
8540 	};
8541 	return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8542 			nfs4_proc_bind_conn_to_session_callback, &data);
8543 }
8544 
8545 /*
8546  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8547  * and operations we'd like to see to enable certain features in the allow map
8548  */
8549 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8550 	.how = SP4_MACH_CRED,
8551 	.enforce.u.words = {
8552 		[1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8553 		      1 << (OP_EXCHANGE_ID - 32) |
8554 		      1 << (OP_CREATE_SESSION - 32) |
8555 		      1 << (OP_DESTROY_SESSION - 32) |
8556 		      1 << (OP_DESTROY_CLIENTID - 32)
8557 	},
8558 	.allow.u.words = {
8559 		[0] = 1 << (OP_CLOSE) |
8560 		      1 << (OP_OPEN_DOWNGRADE) |
8561 		      1 << (OP_LOCKU) |
8562 		      1 << (OP_DELEGRETURN) |
8563 		      1 << (OP_COMMIT),
8564 		[1] = 1 << (OP_SECINFO - 32) |
8565 		      1 << (OP_SECINFO_NO_NAME - 32) |
8566 		      1 << (OP_LAYOUTRETURN - 32) |
8567 		      1 << (OP_TEST_STATEID - 32) |
8568 		      1 << (OP_FREE_STATEID - 32) |
8569 		      1 << (OP_WRITE - 32)
8570 	}
8571 };
8572 
8573 /*
8574  * Select the state protection mode for client `clp' given the server results
8575  * from exchange_id in `sp'.
8576  *
8577  * Returns 0 on success, negative errno otherwise.
8578  */
nfs4_sp4_select_mode(struct nfs_client * clp,struct nfs41_state_protection * sp)8579 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8580 				 struct nfs41_state_protection *sp)
8581 {
8582 	static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8583 		[1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8584 		      1 << (OP_EXCHANGE_ID - 32) |
8585 		      1 << (OP_CREATE_SESSION - 32) |
8586 		      1 << (OP_DESTROY_SESSION - 32) |
8587 		      1 << (OP_DESTROY_CLIENTID - 32)
8588 	};
8589 	unsigned long flags = 0;
8590 	unsigned int i;
8591 	int ret = 0;
8592 
8593 	if (sp->how == SP4_MACH_CRED) {
8594 		/* Print state protect result */
8595 		dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8596 		for (i = 0; i <= LAST_NFS4_OP; i++) {
8597 			if (test_bit(i, sp->enforce.u.longs))
8598 				dfprintk(MOUNT, "  enforce op %d\n", i);
8599 			if (test_bit(i, sp->allow.u.longs))
8600 				dfprintk(MOUNT, "  allow op %d\n", i);
8601 		}
8602 
8603 		/* make sure nothing is on enforce list that isn't supported */
8604 		for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8605 			if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8606 				dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8607 				ret = -EINVAL;
8608 				goto out;
8609 			}
8610 		}
8611 
8612 		/*
8613 		 * Minimal mode - state operations are allowed to use machine
8614 		 * credential.  Note this already happens by default, so the
8615 		 * client doesn't have to do anything more than the negotiation.
8616 		 *
8617 		 * NOTE: we don't care if EXCHANGE_ID is in the list -
8618 		 *       we're already using the machine cred for exchange_id
8619 		 *       and will never use a different cred.
8620 		 */
8621 		if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8622 		    test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8623 		    test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8624 		    test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8625 			dfprintk(MOUNT, "sp4_mach_cred:\n");
8626 			dfprintk(MOUNT, "  minimal mode enabled\n");
8627 			__set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8628 		} else {
8629 			dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8630 			ret = -EINVAL;
8631 			goto out;
8632 		}
8633 
8634 		if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8635 		    test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8636 		    test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8637 		    test_bit(OP_LOCKU, sp->allow.u.longs)) {
8638 			dfprintk(MOUNT, "  cleanup mode enabled\n");
8639 			__set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8640 		}
8641 
8642 		if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8643 			dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8644 			__set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8645 		}
8646 
8647 		if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8648 		    test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8649 			dfprintk(MOUNT, "  secinfo mode enabled\n");
8650 			__set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8651 		}
8652 
8653 		if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8654 		    test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8655 			dfprintk(MOUNT, "  stateid mode enabled\n");
8656 			__set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8657 		}
8658 
8659 		if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8660 			dfprintk(MOUNT, "  write mode enabled\n");
8661 			__set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8662 		}
8663 
8664 		if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8665 			dfprintk(MOUNT, "  commit mode enabled\n");
8666 			__set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8667 		}
8668 	}
8669 out:
8670 	clp->cl_sp4_flags = flags;
8671 	return ret;
8672 }
8673 
8674 struct nfs41_exchange_id_data {
8675 	struct nfs41_exchange_id_res res;
8676 	struct nfs41_exchange_id_args args;
8677 };
8678 
nfs4_exchange_id_release(void * data)8679 static void nfs4_exchange_id_release(void *data)
8680 {
8681 	struct nfs41_exchange_id_data *cdata =
8682 					(struct nfs41_exchange_id_data *)data;
8683 
8684 	nfs_put_client(cdata->args.client);
8685 	kfree(cdata->res.impl_id);
8686 	kfree(cdata->res.server_scope);
8687 	kfree(cdata->res.server_owner);
8688 	kfree(cdata);
8689 }
8690 
8691 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8692 	.rpc_release = nfs4_exchange_id_release,
8693 };
8694 
8695 /*
8696  * _nfs4_proc_exchange_id()
8697  *
8698  * Wrapper for EXCHANGE_ID operation.
8699  */
8700 static struct rpc_task *
nfs4_run_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how,struct rpc_xprt * xprt)8701 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8702 			u32 sp4_how, struct rpc_xprt *xprt)
8703 {
8704 	struct rpc_message msg = {
8705 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8706 		.rpc_cred = cred,
8707 	};
8708 	struct rpc_task_setup task_setup_data = {
8709 		.rpc_client = clp->cl_rpcclient,
8710 		.callback_ops = &nfs4_exchange_id_call_ops,
8711 		.rpc_message = &msg,
8712 		.flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8713 	};
8714 	struct nfs41_exchange_id_data *calldata;
8715 	int status;
8716 
8717 	if (!refcount_inc_not_zero(&clp->cl_count))
8718 		return ERR_PTR(-EIO);
8719 
8720 	status = -ENOMEM;
8721 	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8722 	if (!calldata)
8723 		goto out;
8724 
8725 	nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8726 
8727 	status = nfs4_init_uniform_client_string(clp);
8728 	if (status)
8729 		goto out_calldata;
8730 
8731 	calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8732 						GFP_NOFS);
8733 	status = -ENOMEM;
8734 	if (unlikely(calldata->res.server_owner == NULL))
8735 		goto out_calldata;
8736 
8737 	calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8738 					GFP_NOFS);
8739 	if (unlikely(calldata->res.server_scope == NULL))
8740 		goto out_server_owner;
8741 
8742 	calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8743 	if (unlikely(calldata->res.impl_id == NULL))
8744 		goto out_server_scope;
8745 
8746 	switch (sp4_how) {
8747 	case SP4_NONE:
8748 		calldata->args.state_protect.how = SP4_NONE;
8749 		break;
8750 
8751 	case SP4_MACH_CRED:
8752 		calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8753 		break;
8754 
8755 	default:
8756 		/* unsupported! */
8757 		WARN_ON_ONCE(1);
8758 		status = -EINVAL;
8759 		goto out_impl_id;
8760 	}
8761 	if (xprt) {
8762 		task_setup_data.rpc_xprt = xprt;
8763 		task_setup_data.flags |= RPC_TASK_SOFTCONN;
8764 		memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8765 				sizeof(calldata->args.verifier.data));
8766 	}
8767 	calldata->args.client = clp;
8768 	calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8769 	EXCHGID4_FLAG_BIND_PRINC_STATEID;
8770 #ifdef CONFIG_NFS_V4_1_MIGRATION
8771 	calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8772 #endif
8773 	msg.rpc_argp = &calldata->args;
8774 	msg.rpc_resp = &calldata->res;
8775 	task_setup_data.callback_data = calldata;
8776 
8777 	return rpc_run_task(&task_setup_data);
8778 
8779 out_impl_id:
8780 	kfree(calldata->res.impl_id);
8781 out_server_scope:
8782 	kfree(calldata->res.server_scope);
8783 out_server_owner:
8784 	kfree(calldata->res.server_owner);
8785 out_calldata:
8786 	kfree(calldata);
8787 out:
8788 	nfs_put_client(clp);
8789 	return ERR_PTR(status);
8790 }
8791 
8792 /*
8793  * _nfs4_proc_exchange_id()
8794  *
8795  * Wrapper for EXCHANGE_ID operation.
8796  */
_nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred,u32 sp4_how)8797 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8798 			u32 sp4_how)
8799 {
8800 	struct rpc_task *task;
8801 	struct nfs41_exchange_id_args *argp;
8802 	struct nfs41_exchange_id_res *resp;
8803 	unsigned long now = jiffies;
8804 	int status;
8805 
8806 	task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8807 	if (IS_ERR(task))
8808 		return PTR_ERR(task);
8809 
8810 	argp = task->tk_msg.rpc_argp;
8811 	resp = task->tk_msg.rpc_resp;
8812 	status = task->tk_status;
8813 	if (status  != 0)
8814 		goto out;
8815 
8816 	status = nfs4_check_cl_exchange_flags(resp->flags,
8817 			clp->cl_mvops->minor_version);
8818 	if (status  != 0)
8819 		goto out;
8820 
8821 	status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8822 	if (status != 0)
8823 		goto out;
8824 
8825 	do_renew_lease(clp, now);
8826 
8827 	clp->cl_clientid = resp->clientid;
8828 	clp->cl_exchange_flags = resp->flags;
8829 	clp->cl_seqid = resp->seqid;
8830 	/* Client ID is not confirmed */
8831 	if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8832 		clear_bit(NFS4_SESSION_ESTABLISHED,
8833 			  &clp->cl_session->session_state);
8834 
8835 	if (clp->cl_serverscope != NULL &&
8836 	    !nfs41_same_server_scope(clp->cl_serverscope,
8837 				resp->server_scope)) {
8838 		dprintk("%s: server_scope mismatch detected\n",
8839 			__func__);
8840 		set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8841 	}
8842 
8843 	swap(clp->cl_serverowner, resp->server_owner);
8844 	swap(clp->cl_serverscope, resp->server_scope);
8845 	swap(clp->cl_implid, resp->impl_id);
8846 
8847 	/* Save the EXCHANGE_ID verifier session trunk tests */
8848 	memcpy(clp->cl_confirm.data, argp->verifier.data,
8849 	       sizeof(clp->cl_confirm.data));
8850 out:
8851 	trace_nfs4_exchange_id(clp, status);
8852 	rpc_put_task(task);
8853 	return status;
8854 }
8855 
8856 /*
8857  * nfs4_proc_exchange_id()
8858  *
8859  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8860  *
8861  * Since the clientid has expired, all compounds using sessions
8862  * associated with the stale clientid will be returning
8863  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8864  * be in some phase of session reset.
8865  *
8866  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8867  */
nfs4_proc_exchange_id(struct nfs_client * clp,const struct cred * cred)8868 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8869 {
8870 	rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8871 	int status;
8872 
8873 	/* try SP4_MACH_CRED if krb5i/p	*/
8874 	if (authflavor == RPC_AUTH_GSS_KRB5I ||
8875 	    authflavor == RPC_AUTH_GSS_KRB5P) {
8876 		status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8877 		if (!status)
8878 			return 0;
8879 	}
8880 
8881 	/* try SP4_NONE */
8882 	return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8883 }
8884 
8885 /**
8886  * nfs4_test_session_trunk
8887  *
8888  * This is an add_xprt_test() test function called from
8889  * rpc_clnt_setup_test_and_add_xprt.
8890  *
8891  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8892  * and is dereferrenced in nfs4_exchange_id_release
8893  *
8894  * Upon success, add the new transport to the rpc_clnt
8895  *
8896  * @clnt: struct rpc_clnt to get new transport
8897  * @xprt: the rpc_xprt to test
8898  * @data: call data for _nfs4_proc_exchange_id.
8899  */
nfs4_test_session_trunk(struct rpc_clnt * clnt,struct rpc_xprt * xprt,void * data)8900 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8901 			    void *data)
8902 {
8903 	struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8904 	struct rpc_task *task;
8905 	int status;
8906 
8907 	u32 sp4_how;
8908 
8909 	dprintk("--> %s try %s\n", __func__,
8910 		xprt->address_strings[RPC_DISPLAY_ADDR]);
8911 
8912 	sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8913 
8914 	/* Test connection for session trunking. Async exchange_id call */
8915 	task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8916 	if (IS_ERR(task))
8917 		return;
8918 
8919 	status = task->tk_status;
8920 	if (status == 0)
8921 		status = nfs4_detect_session_trunking(adata->clp,
8922 				task->tk_msg.rpc_resp, xprt);
8923 
8924 	if (status == 0)
8925 		rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8926 
8927 	rpc_put_task(task);
8928 }
8929 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8930 
_nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)8931 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8932 		const struct cred *cred)
8933 {
8934 	struct rpc_message msg = {
8935 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8936 		.rpc_argp = clp,
8937 		.rpc_cred = cred,
8938 	};
8939 	int status;
8940 
8941 	status = rpc_call_sync(clp->cl_rpcclient, &msg,
8942 			       RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8943 	trace_nfs4_destroy_clientid(clp, status);
8944 	if (status)
8945 		dprintk("NFS: Got error %d from the server %s on "
8946 			"DESTROY_CLIENTID.", status, clp->cl_hostname);
8947 	return status;
8948 }
8949 
nfs4_proc_destroy_clientid(struct nfs_client * clp,const struct cred * cred)8950 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8951 		const struct cred *cred)
8952 {
8953 	unsigned int loop;
8954 	int ret;
8955 
8956 	for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8957 		ret = _nfs4_proc_destroy_clientid(clp, cred);
8958 		switch (ret) {
8959 		case -NFS4ERR_DELAY:
8960 		case -NFS4ERR_CLIENTID_BUSY:
8961 			ssleep(1);
8962 			break;
8963 		default:
8964 			return ret;
8965 		}
8966 	}
8967 	return 0;
8968 }
8969 
nfs4_destroy_clientid(struct nfs_client * clp)8970 int nfs4_destroy_clientid(struct nfs_client *clp)
8971 {
8972 	const struct cred *cred;
8973 	int ret = 0;
8974 
8975 	if (clp->cl_mvops->minor_version < 1)
8976 		goto out;
8977 	if (clp->cl_exchange_flags == 0)
8978 		goto out;
8979 	if (clp->cl_preserve_clid)
8980 		goto out;
8981 	cred = nfs4_get_clid_cred(clp);
8982 	ret = nfs4_proc_destroy_clientid(clp, cred);
8983 	put_cred(cred);
8984 	switch (ret) {
8985 	case 0:
8986 	case -NFS4ERR_STALE_CLIENTID:
8987 		clp->cl_exchange_flags = 0;
8988 	}
8989 out:
8990 	return ret;
8991 }
8992 
8993 #endif /* CONFIG_NFS_V4_1 */
8994 
8995 struct nfs4_get_lease_time_data {
8996 	struct nfs4_get_lease_time_args *args;
8997 	struct nfs4_get_lease_time_res *res;
8998 	struct nfs_client *clp;
8999 };
9000 
nfs4_get_lease_time_prepare(struct rpc_task * task,void * calldata)9001 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9002 					void *calldata)
9003 {
9004 	struct nfs4_get_lease_time_data *data =
9005 			(struct nfs4_get_lease_time_data *)calldata;
9006 
9007 	/* just setup sequence, do not trigger session recovery
9008 	   since we're invoked within one */
9009 	nfs4_setup_sequence(data->clp,
9010 			&data->args->la_seq_args,
9011 			&data->res->lr_seq_res,
9012 			task);
9013 }
9014 
9015 /*
9016  * Called from nfs4_state_manager thread for session setup, so don't recover
9017  * from sequence operation or clientid errors.
9018  */
nfs4_get_lease_time_done(struct rpc_task * task,void * calldata)9019 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9020 {
9021 	struct nfs4_get_lease_time_data *data =
9022 			(struct nfs4_get_lease_time_data *)calldata;
9023 
9024 	if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9025 		return;
9026 	switch (task->tk_status) {
9027 	case -NFS4ERR_DELAY:
9028 	case -NFS4ERR_GRACE:
9029 		rpc_delay(task, NFS4_POLL_RETRY_MIN);
9030 		task->tk_status = 0;
9031 		fallthrough;
9032 	case -NFS4ERR_RETRY_UNCACHED_REP:
9033 		rpc_restart_call_prepare(task);
9034 		return;
9035 	}
9036 }
9037 
9038 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9039 	.rpc_call_prepare = nfs4_get_lease_time_prepare,
9040 	.rpc_call_done = nfs4_get_lease_time_done,
9041 };
9042 
nfs4_proc_get_lease_time(struct nfs_client * clp,struct nfs_fsinfo * fsinfo)9043 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9044 {
9045 	struct nfs4_get_lease_time_args args;
9046 	struct nfs4_get_lease_time_res res = {
9047 		.lr_fsinfo = fsinfo,
9048 	};
9049 	struct nfs4_get_lease_time_data data = {
9050 		.args = &args,
9051 		.res = &res,
9052 		.clp = clp,
9053 	};
9054 	struct rpc_message msg = {
9055 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9056 		.rpc_argp = &args,
9057 		.rpc_resp = &res,
9058 	};
9059 	struct rpc_task_setup task_setup = {
9060 		.rpc_client = clp->cl_rpcclient,
9061 		.rpc_message = &msg,
9062 		.callback_ops = &nfs4_get_lease_time_ops,
9063 		.callback_data = &data,
9064 		.flags = RPC_TASK_TIMEOUT,
9065 	};
9066 
9067 	nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9068 	return nfs4_call_sync_custom(&task_setup);
9069 }
9070 
9071 #ifdef CONFIG_NFS_V4_1
9072 
9073 /*
9074  * Initialize the values to be used by the client in CREATE_SESSION
9075  * If nfs4_init_session set the fore channel request and response sizes,
9076  * use them.
9077  *
9078  * Set the back channel max_resp_sz_cached to zero to force the client to
9079  * always set csa_cachethis to FALSE because the current implementation
9080  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9081  */
nfs4_init_channel_attrs(struct nfs41_create_session_args * args,struct rpc_clnt * clnt)9082 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9083 				    struct rpc_clnt *clnt)
9084 {
9085 	unsigned int max_rqst_sz, max_resp_sz;
9086 	unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9087 	unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9088 
9089 	max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9090 	max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9091 
9092 	/* Fore channel attributes */
9093 	args->fc_attrs.max_rqst_sz = max_rqst_sz;
9094 	args->fc_attrs.max_resp_sz = max_resp_sz;
9095 	args->fc_attrs.max_ops = NFS4_MAX_OPS;
9096 	args->fc_attrs.max_reqs = max_session_slots;
9097 
9098 	dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9099 		"max_ops=%u max_reqs=%u\n",
9100 		__func__,
9101 		args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9102 		args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9103 
9104 	/* Back channel attributes */
9105 	args->bc_attrs.max_rqst_sz = max_bc_payload;
9106 	args->bc_attrs.max_resp_sz = max_bc_payload;
9107 	args->bc_attrs.max_resp_sz_cached = 0;
9108 	args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9109 	args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9110 	if (args->bc_attrs.max_reqs > max_bc_slots)
9111 		args->bc_attrs.max_reqs = max_bc_slots;
9112 
9113 	dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9114 		"max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9115 		__func__,
9116 		args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9117 		args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9118 		args->bc_attrs.max_reqs);
9119 }
9120 
nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9121 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9122 		struct nfs41_create_session_res *res)
9123 {
9124 	struct nfs4_channel_attrs *sent = &args->fc_attrs;
9125 	struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9126 
9127 	if (rcvd->max_resp_sz > sent->max_resp_sz)
9128 		return -EINVAL;
9129 	/*
9130 	 * Our requested max_ops is the minimum we need; we're not
9131 	 * prepared to break up compounds into smaller pieces than that.
9132 	 * So, no point even trying to continue if the server won't
9133 	 * cooperate:
9134 	 */
9135 	if (rcvd->max_ops < sent->max_ops)
9136 		return -EINVAL;
9137 	if (rcvd->max_reqs == 0)
9138 		return -EINVAL;
9139 	if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9140 		rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9141 	return 0;
9142 }
9143 
nfs4_verify_back_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9144 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9145 		struct nfs41_create_session_res *res)
9146 {
9147 	struct nfs4_channel_attrs *sent = &args->bc_attrs;
9148 	struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9149 
9150 	if (!(res->flags & SESSION4_BACK_CHAN))
9151 		goto out;
9152 	if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9153 		return -EINVAL;
9154 	if (rcvd->max_resp_sz < sent->max_resp_sz)
9155 		return -EINVAL;
9156 	if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9157 		return -EINVAL;
9158 	if (rcvd->max_ops > sent->max_ops)
9159 		return -EINVAL;
9160 	if (rcvd->max_reqs > sent->max_reqs)
9161 		return -EINVAL;
9162 out:
9163 	return 0;
9164 }
9165 
nfs4_verify_channel_attrs(struct nfs41_create_session_args * args,struct nfs41_create_session_res * res)9166 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9167 				     struct nfs41_create_session_res *res)
9168 {
9169 	int ret;
9170 
9171 	ret = nfs4_verify_fore_channel_attrs(args, res);
9172 	if (ret)
9173 		return ret;
9174 	return nfs4_verify_back_channel_attrs(args, res);
9175 }
9176 
nfs4_update_session(struct nfs4_session * session,struct nfs41_create_session_res * res)9177 static void nfs4_update_session(struct nfs4_session *session,
9178 		struct nfs41_create_session_res *res)
9179 {
9180 	nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9181 	/* Mark client id and session as being confirmed */
9182 	session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9183 	set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9184 	session->flags = res->flags;
9185 	memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9186 	if (res->flags & SESSION4_BACK_CHAN)
9187 		memcpy(&session->bc_attrs, &res->bc_attrs,
9188 				sizeof(session->bc_attrs));
9189 }
9190 
_nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9191 static int _nfs4_proc_create_session(struct nfs_client *clp,
9192 		const struct cred *cred)
9193 {
9194 	struct nfs4_session *session = clp->cl_session;
9195 	struct nfs41_create_session_args args = {
9196 		.client = clp,
9197 		.clientid = clp->cl_clientid,
9198 		.seqid = clp->cl_seqid,
9199 		.cb_program = NFS4_CALLBACK,
9200 	};
9201 	struct nfs41_create_session_res res;
9202 
9203 	struct rpc_message msg = {
9204 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9205 		.rpc_argp = &args,
9206 		.rpc_resp = &res,
9207 		.rpc_cred = cred,
9208 	};
9209 	int status;
9210 
9211 	nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9212 	args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9213 
9214 	status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9215 			       RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9216 	trace_nfs4_create_session(clp, status);
9217 
9218 	switch (status) {
9219 	case -NFS4ERR_STALE_CLIENTID:
9220 	case -NFS4ERR_DELAY:
9221 	case -ETIMEDOUT:
9222 	case -EACCES:
9223 	case -EAGAIN:
9224 		goto out;
9225 	}
9226 
9227 	clp->cl_seqid++;
9228 	if (!status) {
9229 		/* Verify the session's negotiated channel_attrs values */
9230 		status = nfs4_verify_channel_attrs(&args, &res);
9231 		/* Increment the clientid slot sequence id */
9232 		if (status)
9233 			goto out;
9234 		nfs4_update_session(session, &res);
9235 	}
9236 out:
9237 	return status;
9238 }
9239 
9240 /*
9241  * Issues a CREATE_SESSION operation to the server.
9242  * It is the responsibility of the caller to verify the session is
9243  * expired before calling this routine.
9244  */
nfs4_proc_create_session(struct nfs_client * clp,const struct cred * cred)9245 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9246 {
9247 	int status;
9248 	unsigned *ptr;
9249 	struct nfs4_session *session = clp->cl_session;
9250 
9251 	dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9252 
9253 	status = _nfs4_proc_create_session(clp, cred);
9254 	if (status)
9255 		goto out;
9256 
9257 	/* Init or reset the session slot tables */
9258 	status = nfs4_setup_session_slot_tables(session);
9259 	dprintk("slot table setup returned %d\n", status);
9260 	if (status)
9261 		goto out;
9262 
9263 	ptr = (unsigned *)&session->sess_id.data[0];
9264 	dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9265 		clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9266 out:
9267 	return status;
9268 }
9269 
9270 /*
9271  * Issue the over-the-wire RPC DESTROY_SESSION.
9272  * The caller must serialize access to this routine.
9273  */
nfs4_proc_destroy_session(struct nfs4_session * session,const struct cred * cred)9274 int nfs4_proc_destroy_session(struct nfs4_session *session,
9275 		const struct cred *cred)
9276 {
9277 	struct rpc_message msg = {
9278 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9279 		.rpc_argp = session,
9280 		.rpc_cred = cred,
9281 	};
9282 	int status = 0;
9283 
9284 	/* session is still being setup */
9285 	if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9286 		return 0;
9287 
9288 	status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9289 			       RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9290 	trace_nfs4_destroy_session(session->clp, status);
9291 
9292 	if (status)
9293 		dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9294 			"Session has been destroyed regardless...\n", status);
9295 	return status;
9296 }
9297 
9298 /*
9299  * Renew the cl_session lease.
9300  */
9301 struct nfs4_sequence_data {
9302 	struct nfs_client *clp;
9303 	struct nfs4_sequence_args args;
9304 	struct nfs4_sequence_res res;
9305 };
9306 
nfs41_sequence_release(void * data)9307 static void nfs41_sequence_release(void *data)
9308 {
9309 	struct nfs4_sequence_data *calldata = data;
9310 	struct nfs_client *clp = calldata->clp;
9311 
9312 	if (refcount_read(&clp->cl_count) > 1)
9313 		nfs4_schedule_state_renewal(clp);
9314 	nfs_put_client(clp);
9315 	kfree(calldata);
9316 }
9317 
nfs41_sequence_handle_errors(struct rpc_task * task,struct nfs_client * clp)9318 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9319 {
9320 	switch(task->tk_status) {
9321 	case -NFS4ERR_DELAY:
9322 		rpc_delay(task, NFS4_POLL_RETRY_MAX);
9323 		return -EAGAIN;
9324 	default:
9325 		nfs4_schedule_lease_recovery(clp);
9326 	}
9327 	return 0;
9328 }
9329 
nfs41_sequence_call_done(struct rpc_task * task,void * data)9330 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9331 {
9332 	struct nfs4_sequence_data *calldata = data;
9333 	struct nfs_client *clp = calldata->clp;
9334 
9335 	if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9336 		return;
9337 
9338 	trace_nfs4_sequence(clp, task->tk_status);
9339 	if (task->tk_status < 0) {
9340 		dprintk("%s ERROR %d\n", __func__, task->tk_status);
9341 		if (refcount_read(&clp->cl_count) == 1)
9342 			return;
9343 
9344 		if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9345 			rpc_restart_call_prepare(task);
9346 			return;
9347 		}
9348 	}
9349 	dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9350 }
9351 
nfs41_sequence_prepare(struct rpc_task * task,void * data)9352 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9353 {
9354 	struct nfs4_sequence_data *calldata = data;
9355 	struct nfs_client *clp = calldata->clp;
9356 	struct nfs4_sequence_args *args;
9357 	struct nfs4_sequence_res *res;
9358 
9359 	args = task->tk_msg.rpc_argp;
9360 	res = task->tk_msg.rpc_resp;
9361 
9362 	nfs4_setup_sequence(clp, args, res, task);
9363 }
9364 
9365 static const struct rpc_call_ops nfs41_sequence_ops = {
9366 	.rpc_call_done = nfs41_sequence_call_done,
9367 	.rpc_call_prepare = nfs41_sequence_prepare,
9368 	.rpc_release = nfs41_sequence_release,
9369 };
9370 
_nfs41_proc_sequence(struct nfs_client * clp,const struct cred * cred,struct nfs4_slot * slot,bool is_privileged)9371 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9372 		const struct cred *cred,
9373 		struct nfs4_slot *slot,
9374 		bool is_privileged)
9375 {
9376 	struct nfs4_sequence_data *calldata;
9377 	struct rpc_message msg = {
9378 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9379 		.rpc_cred = cred,
9380 	};
9381 	struct rpc_task_setup task_setup_data = {
9382 		.rpc_client = clp->cl_rpcclient,
9383 		.rpc_message = &msg,
9384 		.callback_ops = &nfs41_sequence_ops,
9385 		.flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9386 	};
9387 	struct rpc_task *ret;
9388 
9389 	ret = ERR_PTR(-EIO);
9390 	if (!refcount_inc_not_zero(&clp->cl_count))
9391 		goto out_err;
9392 
9393 	ret = ERR_PTR(-ENOMEM);
9394 	calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9395 	if (calldata == NULL)
9396 		goto out_put_clp;
9397 	nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9398 	nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9399 	msg.rpc_argp = &calldata->args;
9400 	msg.rpc_resp = &calldata->res;
9401 	calldata->clp = clp;
9402 	task_setup_data.callback_data = calldata;
9403 
9404 	ret = rpc_run_task(&task_setup_data);
9405 	if (IS_ERR(ret))
9406 		goto out_err;
9407 	return ret;
9408 out_put_clp:
9409 	nfs_put_client(clp);
9410 out_err:
9411 	nfs41_release_slot(slot);
9412 	return ret;
9413 }
9414 
nfs41_proc_async_sequence(struct nfs_client * clp,const struct cred * cred,unsigned renew_flags)9415 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9416 {
9417 	struct rpc_task *task;
9418 	int ret = 0;
9419 
9420 	if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9421 		return -EAGAIN;
9422 	task = _nfs41_proc_sequence(clp, cred, NULL, false);
9423 	if (IS_ERR(task))
9424 		ret = PTR_ERR(task);
9425 	else
9426 		rpc_put_task_async(task);
9427 	dprintk("<-- %s status=%d\n", __func__, ret);
9428 	return ret;
9429 }
9430 
nfs4_proc_sequence(struct nfs_client * clp,const struct cred * cred)9431 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9432 {
9433 	struct rpc_task *task;
9434 	int ret;
9435 
9436 	task = _nfs41_proc_sequence(clp, cred, NULL, true);
9437 	if (IS_ERR(task)) {
9438 		ret = PTR_ERR(task);
9439 		goto out;
9440 	}
9441 	ret = rpc_wait_for_completion_task(task);
9442 	if (!ret)
9443 		ret = task->tk_status;
9444 	rpc_put_task(task);
9445 out:
9446 	dprintk("<-- %s status=%d\n", __func__, ret);
9447 	return ret;
9448 }
9449 
9450 struct nfs4_reclaim_complete_data {
9451 	struct nfs_client *clp;
9452 	struct nfs41_reclaim_complete_args arg;
9453 	struct nfs41_reclaim_complete_res res;
9454 };
9455 
nfs4_reclaim_complete_prepare(struct rpc_task * task,void * data)9456 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9457 {
9458 	struct nfs4_reclaim_complete_data *calldata = data;
9459 
9460 	nfs4_setup_sequence(calldata->clp,
9461 			&calldata->arg.seq_args,
9462 			&calldata->res.seq_res,
9463 			task);
9464 }
9465 
nfs41_reclaim_complete_handle_errors(struct rpc_task * task,struct nfs_client * clp)9466 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9467 {
9468 	switch(task->tk_status) {
9469 	case 0:
9470 		wake_up_all(&clp->cl_lock_waitq);
9471 		fallthrough;
9472 	case -NFS4ERR_COMPLETE_ALREADY:
9473 	case -NFS4ERR_WRONG_CRED: /* What to do here? */
9474 		break;
9475 	case -NFS4ERR_DELAY:
9476 		rpc_delay(task, NFS4_POLL_RETRY_MAX);
9477 		fallthrough;
9478 	case -NFS4ERR_RETRY_UNCACHED_REP:
9479 	case -EACCES:
9480 		dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9481 			__func__, task->tk_status, clp->cl_hostname);
9482 		return -EAGAIN;
9483 	case -NFS4ERR_BADSESSION:
9484 	case -NFS4ERR_DEADSESSION:
9485 	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9486 		break;
9487 	default:
9488 		nfs4_schedule_lease_recovery(clp);
9489 	}
9490 	return 0;
9491 }
9492 
nfs4_reclaim_complete_done(struct rpc_task * task,void * data)9493 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9494 {
9495 	struct nfs4_reclaim_complete_data *calldata = data;
9496 	struct nfs_client *clp = calldata->clp;
9497 	struct nfs4_sequence_res *res = &calldata->res.seq_res;
9498 
9499 	if (!nfs41_sequence_done(task, res))
9500 		return;
9501 
9502 	trace_nfs4_reclaim_complete(clp, task->tk_status);
9503 	if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9504 		rpc_restart_call_prepare(task);
9505 		return;
9506 	}
9507 }
9508 
nfs4_free_reclaim_complete_data(void * data)9509 static void nfs4_free_reclaim_complete_data(void *data)
9510 {
9511 	struct nfs4_reclaim_complete_data *calldata = data;
9512 
9513 	kfree(calldata);
9514 }
9515 
9516 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9517 	.rpc_call_prepare = nfs4_reclaim_complete_prepare,
9518 	.rpc_call_done = nfs4_reclaim_complete_done,
9519 	.rpc_release = nfs4_free_reclaim_complete_data,
9520 };
9521 
9522 /*
9523  * Issue a global reclaim complete.
9524  */
nfs41_proc_reclaim_complete(struct nfs_client * clp,const struct cred * cred)9525 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9526 		const struct cred *cred)
9527 {
9528 	struct nfs4_reclaim_complete_data *calldata;
9529 	struct rpc_message msg = {
9530 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9531 		.rpc_cred = cred,
9532 	};
9533 	struct rpc_task_setup task_setup_data = {
9534 		.rpc_client = clp->cl_rpcclient,
9535 		.rpc_message = &msg,
9536 		.callback_ops = &nfs4_reclaim_complete_call_ops,
9537 		.flags = RPC_TASK_NO_ROUND_ROBIN,
9538 	};
9539 	int status = -ENOMEM;
9540 
9541 	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9542 	if (calldata == NULL)
9543 		goto out;
9544 	calldata->clp = clp;
9545 	calldata->arg.one_fs = 0;
9546 
9547 	nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9548 	msg.rpc_argp = &calldata->arg;
9549 	msg.rpc_resp = &calldata->res;
9550 	task_setup_data.callback_data = calldata;
9551 	status = nfs4_call_sync_custom(&task_setup_data);
9552 out:
9553 	dprintk("<-- %s status=%d\n", __func__, status);
9554 	return status;
9555 }
9556 
9557 static void
nfs4_layoutget_prepare(struct rpc_task * task,void * calldata)9558 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9559 {
9560 	struct nfs4_layoutget *lgp = calldata;
9561 	struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9562 
9563 	nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9564 				&lgp->res.seq_res, task);
9565 }
9566 
nfs4_layoutget_done(struct rpc_task * task,void * calldata)9567 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9568 {
9569 	struct nfs4_layoutget *lgp = calldata;
9570 
9571 	nfs41_sequence_process(task, &lgp->res.seq_res);
9572 }
9573 
9574 static int
nfs4_layoutget_handle_exception(struct rpc_task * task,struct nfs4_layoutget * lgp,struct nfs4_exception * exception)9575 nfs4_layoutget_handle_exception(struct rpc_task *task,
9576 		struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9577 {
9578 	struct inode *inode = lgp->args.inode;
9579 	struct nfs_server *server = NFS_SERVER(inode);
9580 	struct pnfs_layout_hdr *lo = lgp->lo;
9581 	int nfs4err = task->tk_status;
9582 	int err, status = 0;
9583 	LIST_HEAD(head);
9584 
9585 	dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9586 
9587 	nfs4_sequence_free_slot(&lgp->res.seq_res);
9588 
9589 	switch (nfs4err) {
9590 	case 0:
9591 		goto out;
9592 
9593 	/*
9594 	 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9595 	 * on the file. set tk_status to -ENODATA to tell upper layer to
9596 	 * retry go inband.
9597 	 */
9598 	case -NFS4ERR_LAYOUTUNAVAILABLE:
9599 		status = -ENODATA;
9600 		goto out;
9601 	/*
9602 	 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9603 	 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9604 	 */
9605 	case -NFS4ERR_BADLAYOUT:
9606 		status = -EOVERFLOW;
9607 		goto out;
9608 	/*
9609 	 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9610 	 * (or clients) writing to the same RAID stripe except when
9611 	 * the minlength argument is 0 (see RFC5661 section 18.43.3).
9612 	 *
9613 	 * Treat it like we would RECALLCONFLICT -- we retry for a little
9614 	 * while, and then eventually give up.
9615 	 */
9616 	case -NFS4ERR_LAYOUTTRYLATER:
9617 		if (lgp->args.minlength == 0) {
9618 			status = -EOVERFLOW;
9619 			goto out;
9620 		}
9621 		status = -EBUSY;
9622 		break;
9623 	case -NFS4ERR_RECALLCONFLICT:
9624 		status = -ERECALLCONFLICT;
9625 		break;
9626 	case -NFS4ERR_DELEG_REVOKED:
9627 	case -NFS4ERR_ADMIN_REVOKED:
9628 	case -NFS4ERR_EXPIRED:
9629 	case -NFS4ERR_BAD_STATEID:
9630 		exception->timeout = 0;
9631 		spin_lock(&inode->i_lock);
9632 		/* If the open stateid was bad, then recover it. */
9633 		if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9634 		    !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9635 			spin_unlock(&inode->i_lock);
9636 			exception->state = lgp->args.ctx->state;
9637 			exception->stateid = &lgp->args.stateid;
9638 			break;
9639 		}
9640 
9641 		/*
9642 		 * Mark the bad layout state as invalid, then retry
9643 		 */
9644 		pnfs_mark_layout_stateid_invalid(lo, &head);
9645 		spin_unlock(&inode->i_lock);
9646 		nfs_commit_inode(inode, 0);
9647 		pnfs_free_lseg_list(&head);
9648 		status = -EAGAIN;
9649 		goto out;
9650 	}
9651 
9652 	err = nfs4_handle_exception(server, nfs4err, exception);
9653 	if (!status) {
9654 		if (exception->retry)
9655 			status = -EAGAIN;
9656 		else
9657 			status = err;
9658 	}
9659 out:
9660 	return status;
9661 }
9662 
max_response_pages(struct nfs_server * server)9663 size_t max_response_pages(struct nfs_server *server)
9664 {
9665 	u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9666 	return nfs_page_array_len(0, max_resp_sz);
9667 }
9668 
nfs4_layoutget_release(void * calldata)9669 static void nfs4_layoutget_release(void *calldata)
9670 {
9671 	struct nfs4_layoutget *lgp = calldata;
9672 
9673 	nfs4_sequence_free_slot(&lgp->res.seq_res);
9674 	pnfs_layoutget_free(lgp);
9675 }
9676 
9677 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9678 	.rpc_call_prepare = nfs4_layoutget_prepare,
9679 	.rpc_call_done = nfs4_layoutget_done,
9680 	.rpc_release = nfs4_layoutget_release,
9681 };
9682 
9683 struct pnfs_layout_segment *
nfs4_proc_layoutget(struct nfs4_layoutget * lgp,long * timeout)9684 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9685 {
9686 	struct inode *inode = lgp->args.inode;
9687 	struct nfs_server *server = NFS_SERVER(inode);
9688 	struct rpc_task *task;
9689 	struct rpc_message msg = {
9690 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9691 		.rpc_argp = &lgp->args,
9692 		.rpc_resp = &lgp->res,
9693 		.rpc_cred = lgp->cred,
9694 	};
9695 	struct rpc_task_setup task_setup_data = {
9696 		.rpc_client = server->client,
9697 		.rpc_message = &msg,
9698 		.callback_ops = &nfs4_layoutget_call_ops,
9699 		.callback_data = lgp,
9700 		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9701 			 RPC_TASK_MOVEABLE,
9702 	};
9703 	struct pnfs_layout_segment *lseg = NULL;
9704 	struct nfs4_exception exception = {
9705 		.inode = inode,
9706 		.timeout = *timeout,
9707 	};
9708 	int status = 0;
9709 
9710 	nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9711 
9712 	task = rpc_run_task(&task_setup_data);
9713 	if (IS_ERR(task))
9714 		return ERR_CAST(task);
9715 
9716 	status = rpc_wait_for_completion_task(task);
9717 	if (status != 0)
9718 		goto out;
9719 
9720 	if (task->tk_status < 0) {
9721 		status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9722 		*timeout = exception.timeout;
9723 	} else if (lgp->res.layoutp->len == 0) {
9724 		status = -EAGAIN;
9725 		*timeout = nfs4_update_delay(&exception.timeout);
9726 	} else
9727 		lseg = pnfs_layout_process(lgp);
9728 out:
9729 	trace_nfs4_layoutget(lgp->args.ctx,
9730 			&lgp->args.range,
9731 			&lgp->res.range,
9732 			&lgp->res.stateid,
9733 			status);
9734 
9735 	rpc_put_task(task);
9736 	dprintk("<-- %s status=%d\n", __func__, status);
9737 	if (status)
9738 		return ERR_PTR(status);
9739 	return lseg;
9740 }
9741 
9742 static void
nfs4_layoutreturn_prepare(struct rpc_task * task,void * calldata)9743 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9744 {
9745 	struct nfs4_layoutreturn *lrp = calldata;
9746 
9747 	nfs4_setup_sequence(lrp->clp,
9748 			&lrp->args.seq_args,
9749 			&lrp->res.seq_res,
9750 			task);
9751 	if (!pnfs_layout_is_valid(lrp->args.layout))
9752 		rpc_exit(task, 0);
9753 }
9754 
nfs4_layoutreturn_done(struct rpc_task * task,void * calldata)9755 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9756 {
9757 	struct nfs4_layoutreturn *lrp = calldata;
9758 	struct nfs_server *server;
9759 
9760 	if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9761 		return;
9762 
9763 	/*
9764 	 * Was there an RPC level error? Assume the call succeeded,
9765 	 * and that we need to release the layout
9766 	 */
9767 	if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9768 		lrp->res.lrs_present = 0;
9769 		return;
9770 	}
9771 
9772 	server = NFS_SERVER(lrp->args.inode);
9773 	switch (task->tk_status) {
9774 	case -NFS4ERR_OLD_STATEID:
9775 		if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9776 					&lrp->args.range,
9777 					lrp->args.inode))
9778 			goto out_restart;
9779 		fallthrough;
9780 	default:
9781 		task->tk_status = 0;
9782 		fallthrough;
9783 	case 0:
9784 		break;
9785 	case -NFS4ERR_DELAY:
9786 		if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9787 			break;
9788 		goto out_restart;
9789 	}
9790 	return;
9791 out_restart:
9792 	task->tk_status = 0;
9793 	nfs4_sequence_free_slot(&lrp->res.seq_res);
9794 	rpc_restart_call_prepare(task);
9795 }
9796 
nfs4_layoutreturn_release(void * calldata)9797 static void nfs4_layoutreturn_release(void *calldata)
9798 {
9799 	struct nfs4_layoutreturn *lrp = calldata;
9800 	struct pnfs_layout_hdr *lo = lrp->args.layout;
9801 
9802 	pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9803 			lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9804 	nfs4_sequence_free_slot(&lrp->res.seq_res);
9805 	if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9806 		lrp->ld_private.ops->free(&lrp->ld_private);
9807 	pnfs_put_layout_hdr(lrp->args.layout);
9808 	nfs_iput_and_deactive(lrp->inode);
9809 	put_cred(lrp->cred);
9810 	kfree(calldata);
9811 }
9812 
9813 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9814 	.rpc_call_prepare = nfs4_layoutreturn_prepare,
9815 	.rpc_call_done = nfs4_layoutreturn_done,
9816 	.rpc_release = nfs4_layoutreturn_release,
9817 };
9818 
nfs4_proc_layoutreturn(struct nfs4_layoutreturn * lrp,bool sync)9819 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9820 {
9821 	struct rpc_task *task;
9822 	struct rpc_message msg = {
9823 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9824 		.rpc_argp = &lrp->args,
9825 		.rpc_resp = &lrp->res,
9826 		.rpc_cred = lrp->cred,
9827 	};
9828 	struct rpc_task_setup task_setup_data = {
9829 		.rpc_client = NFS_SERVER(lrp->args.inode)->client,
9830 		.rpc_message = &msg,
9831 		.callback_ops = &nfs4_layoutreturn_call_ops,
9832 		.callback_data = lrp,
9833 		.flags = RPC_TASK_MOVEABLE,
9834 	};
9835 	int status = 0;
9836 
9837 	nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9838 			NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9839 			&task_setup_data.rpc_client, &msg);
9840 
9841 	lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9842 	if (!sync) {
9843 		if (!lrp->inode) {
9844 			nfs4_layoutreturn_release(lrp);
9845 			return -EAGAIN;
9846 		}
9847 		task_setup_data.flags |= RPC_TASK_ASYNC;
9848 	}
9849 	if (!lrp->inode)
9850 		nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9851 				   1);
9852 	else
9853 		nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9854 				   0);
9855 	task = rpc_run_task(&task_setup_data);
9856 	if (IS_ERR(task))
9857 		return PTR_ERR(task);
9858 	if (sync)
9859 		status = task->tk_status;
9860 	trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9861 	dprintk("<-- %s status=%d\n", __func__, status);
9862 	rpc_put_task(task);
9863 	return status;
9864 }
9865 
9866 static int
_nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)9867 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9868 		struct pnfs_device *pdev,
9869 		const struct cred *cred)
9870 {
9871 	struct nfs4_getdeviceinfo_args args = {
9872 		.pdev = pdev,
9873 		.notify_types = NOTIFY_DEVICEID4_CHANGE |
9874 			NOTIFY_DEVICEID4_DELETE,
9875 	};
9876 	struct nfs4_getdeviceinfo_res res = {
9877 		.pdev = pdev,
9878 	};
9879 	struct rpc_message msg = {
9880 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9881 		.rpc_argp = &args,
9882 		.rpc_resp = &res,
9883 		.rpc_cred = cred,
9884 	};
9885 	int status;
9886 
9887 	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9888 	if (res.notification & ~args.notify_types)
9889 		dprintk("%s: unsupported notification\n", __func__);
9890 	if (res.notification != args.notify_types)
9891 		pdev->nocache = 1;
9892 
9893 	trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9894 
9895 	dprintk("<-- %s status=%d\n", __func__, status);
9896 
9897 	return status;
9898 }
9899 
nfs4_proc_getdeviceinfo(struct nfs_server * server,struct pnfs_device * pdev,const struct cred * cred)9900 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9901 		struct pnfs_device *pdev,
9902 		const struct cred *cred)
9903 {
9904 	struct nfs4_exception exception = { };
9905 	int err;
9906 
9907 	do {
9908 		err = nfs4_handle_exception(server,
9909 					_nfs4_proc_getdeviceinfo(server, pdev, cred),
9910 					&exception);
9911 	} while (exception.retry);
9912 	return err;
9913 }
9914 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9915 
nfs4_layoutcommit_prepare(struct rpc_task * task,void * calldata)9916 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9917 {
9918 	struct nfs4_layoutcommit_data *data = calldata;
9919 	struct nfs_server *server = NFS_SERVER(data->args.inode);
9920 
9921 	nfs4_setup_sequence(server->nfs_client,
9922 			&data->args.seq_args,
9923 			&data->res.seq_res,
9924 			task);
9925 }
9926 
9927 static void
nfs4_layoutcommit_done(struct rpc_task * task,void * calldata)9928 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9929 {
9930 	struct nfs4_layoutcommit_data *data = calldata;
9931 	struct nfs_server *server = NFS_SERVER(data->args.inode);
9932 
9933 	if (!nfs41_sequence_done(task, &data->res.seq_res))
9934 		return;
9935 
9936 	switch (task->tk_status) { /* Just ignore these failures */
9937 	case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9938 	case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9939 	case -NFS4ERR_BADLAYOUT:     /* no layout */
9940 	case -NFS4ERR_GRACE:	    /* loca_recalim always false */
9941 		task->tk_status = 0;
9942 		break;
9943 	case 0:
9944 		break;
9945 	default:
9946 		if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9947 			rpc_restart_call_prepare(task);
9948 			return;
9949 		}
9950 	}
9951 }
9952 
nfs4_layoutcommit_release(void * calldata)9953 static void nfs4_layoutcommit_release(void *calldata)
9954 {
9955 	struct nfs4_layoutcommit_data *data = calldata;
9956 
9957 	pnfs_cleanup_layoutcommit(data);
9958 	nfs_post_op_update_inode_force_wcc(data->args.inode,
9959 					   data->res.fattr);
9960 	put_cred(data->cred);
9961 	nfs_iput_and_deactive(data->inode);
9962 	kfree(data);
9963 }
9964 
9965 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9966 	.rpc_call_prepare = nfs4_layoutcommit_prepare,
9967 	.rpc_call_done = nfs4_layoutcommit_done,
9968 	.rpc_release = nfs4_layoutcommit_release,
9969 };
9970 
9971 int
nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data * data,bool sync)9972 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9973 {
9974 	struct rpc_message msg = {
9975 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9976 		.rpc_argp = &data->args,
9977 		.rpc_resp = &data->res,
9978 		.rpc_cred = data->cred,
9979 	};
9980 	struct rpc_task_setup task_setup_data = {
9981 		.task = &data->task,
9982 		.rpc_client = NFS_CLIENT(data->args.inode),
9983 		.rpc_message = &msg,
9984 		.callback_ops = &nfs4_layoutcommit_ops,
9985 		.callback_data = data,
9986 		.flags = RPC_TASK_MOVEABLE,
9987 	};
9988 	struct rpc_task *task;
9989 	int status = 0;
9990 
9991 	dprintk("NFS: initiating layoutcommit call. sync %d "
9992 		"lbw: %llu inode %lu\n", sync,
9993 		data->args.lastbytewritten,
9994 		data->args.inode->i_ino);
9995 
9996 	if (!sync) {
9997 		data->inode = nfs_igrab_and_active(data->args.inode);
9998 		if (data->inode == NULL) {
9999 			nfs4_layoutcommit_release(data);
10000 			return -EAGAIN;
10001 		}
10002 		task_setup_data.flags = RPC_TASK_ASYNC;
10003 	}
10004 	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10005 	task = rpc_run_task(&task_setup_data);
10006 	if (IS_ERR(task))
10007 		return PTR_ERR(task);
10008 	if (sync)
10009 		status = task->tk_status;
10010 	trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10011 	dprintk("%s: status %d\n", __func__, status);
10012 	rpc_put_task(task);
10013 	return status;
10014 }
10015 
10016 /*
10017  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10018  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10019  */
10020 static int
_nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors,bool use_integrity)10021 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10022 		    struct nfs_fsinfo *info,
10023 		    struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10024 {
10025 	struct nfs41_secinfo_no_name_args args = {
10026 		.style = SECINFO_STYLE_CURRENT_FH,
10027 	};
10028 	struct nfs4_secinfo_res res = {
10029 		.flavors = flavors,
10030 	};
10031 	struct rpc_message msg = {
10032 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10033 		.rpc_argp = &args,
10034 		.rpc_resp = &res,
10035 	};
10036 	struct nfs4_call_sync_data data = {
10037 		.seq_server = server,
10038 		.seq_args = &args.seq_args,
10039 		.seq_res = &res.seq_res,
10040 	};
10041 	struct rpc_task_setup task_setup = {
10042 		.rpc_client = server->client,
10043 		.rpc_message = &msg,
10044 		.callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10045 		.callback_data = &data,
10046 		.flags = RPC_TASK_NO_ROUND_ROBIN,
10047 	};
10048 	const struct cred *cred = NULL;
10049 	int status;
10050 
10051 	if (use_integrity) {
10052 		task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10053 
10054 		cred = nfs4_get_clid_cred(server->nfs_client);
10055 		msg.rpc_cred = cred;
10056 	}
10057 
10058 	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10059 	status = nfs4_call_sync_custom(&task_setup);
10060 	dprintk("<-- %s status=%d\n", __func__, status);
10061 
10062 	put_cred(cred);
10063 
10064 	return status;
10065 }
10066 
10067 static int
nfs41_proc_secinfo_no_name(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info,struct nfs4_secinfo_flavors * flavors)10068 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10069 			   struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10070 {
10071 	struct nfs4_exception exception = {
10072 		.interruptible = true,
10073 	};
10074 	int err;
10075 	do {
10076 		/* first try using integrity protection */
10077 		err = -NFS4ERR_WRONGSEC;
10078 
10079 		/* try to use integrity protection with machine cred */
10080 		if (_nfs4_is_integrity_protected(server->nfs_client))
10081 			err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10082 							  flavors, true);
10083 
10084 		/*
10085 		 * if unable to use integrity protection, or SECINFO with
10086 		 * integrity protection returns NFS4ERR_WRONGSEC (which is
10087 		 * disallowed by spec, but exists in deployed servers) use
10088 		 * the current filesystem's rpc_client and the user cred.
10089 		 */
10090 		if (err == -NFS4ERR_WRONGSEC)
10091 			err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10092 							  flavors, false);
10093 
10094 		switch (err) {
10095 		case 0:
10096 		case -NFS4ERR_WRONGSEC:
10097 		case -ENOTSUPP:
10098 			goto out;
10099 		default:
10100 			err = nfs4_handle_exception(server, err, &exception);
10101 		}
10102 	} while (exception.retry);
10103 out:
10104 	return err;
10105 }
10106 
10107 static int
nfs41_find_root_sec(struct nfs_server * server,struct nfs_fh * fhandle,struct nfs_fsinfo * info)10108 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10109 		    struct nfs_fsinfo *info)
10110 {
10111 	int err;
10112 	struct page *page;
10113 	rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10114 	struct nfs4_secinfo_flavors *flavors;
10115 	struct nfs4_secinfo4 *secinfo;
10116 	int i;
10117 
10118 	page = alloc_page(GFP_KERNEL);
10119 	if (!page) {
10120 		err = -ENOMEM;
10121 		goto out;
10122 	}
10123 
10124 	flavors = page_address(page);
10125 	err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10126 
10127 	/*
10128 	 * Fall back on "guess and check" method if
10129 	 * the server doesn't support SECINFO_NO_NAME
10130 	 */
10131 	if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10132 		err = nfs4_find_root_sec(server, fhandle, info);
10133 		goto out_freepage;
10134 	}
10135 	if (err)
10136 		goto out_freepage;
10137 
10138 	for (i = 0; i < flavors->num_flavors; i++) {
10139 		secinfo = &flavors->flavors[i];
10140 
10141 		switch (secinfo->flavor) {
10142 		case RPC_AUTH_NULL:
10143 		case RPC_AUTH_UNIX:
10144 		case RPC_AUTH_GSS:
10145 			flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10146 					&secinfo->flavor_info);
10147 			break;
10148 		default:
10149 			flavor = RPC_AUTH_MAXFLAVOR;
10150 			break;
10151 		}
10152 
10153 		if (!nfs_auth_info_match(&server->auth_info, flavor))
10154 			flavor = RPC_AUTH_MAXFLAVOR;
10155 
10156 		if (flavor != RPC_AUTH_MAXFLAVOR) {
10157 			err = nfs4_lookup_root_sec(server, fhandle,
10158 						   info, flavor);
10159 			if (!err)
10160 				break;
10161 		}
10162 	}
10163 
10164 	if (flavor == RPC_AUTH_MAXFLAVOR)
10165 		err = -EPERM;
10166 
10167 out_freepage:
10168 	put_page(page);
10169 	if (err == -EACCES)
10170 		return -EPERM;
10171 out:
10172 	return err;
10173 }
10174 
_nfs41_test_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)10175 static int _nfs41_test_stateid(struct nfs_server *server,
10176 		nfs4_stateid *stateid,
10177 		const struct cred *cred)
10178 {
10179 	int status;
10180 	struct nfs41_test_stateid_args args = {
10181 		.stateid = stateid,
10182 	};
10183 	struct nfs41_test_stateid_res res;
10184 	struct rpc_message msg = {
10185 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10186 		.rpc_argp = &args,
10187 		.rpc_resp = &res,
10188 		.rpc_cred = cred,
10189 	};
10190 	struct rpc_clnt *rpc_client = server->client;
10191 
10192 	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10193 		&rpc_client, &msg);
10194 
10195 	dprintk("NFS call  test_stateid %p\n", stateid);
10196 	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10197 	status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10198 			&args.seq_args, &res.seq_res);
10199 	if (status != NFS_OK) {
10200 		dprintk("NFS reply test_stateid: failed, %d\n", status);
10201 		return status;
10202 	}
10203 	dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10204 	return -res.status;
10205 }
10206 
nfs4_handle_delay_or_session_error(struct nfs_server * server,int err,struct nfs4_exception * exception)10207 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10208 		int err, struct nfs4_exception *exception)
10209 {
10210 	exception->retry = 0;
10211 	switch(err) {
10212 	case -NFS4ERR_DELAY:
10213 	case -NFS4ERR_RETRY_UNCACHED_REP:
10214 		nfs4_handle_exception(server, err, exception);
10215 		break;
10216 	case -NFS4ERR_BADSESSION:
10217 	case -NFS4ERR_BADSLOT:
10218 	case -NFS4ERR_BAD_HIGH_SLOT:
10219 	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10220 	case -NFS4ERR_DEADSESSION:
10221 		nfs4_do_handle_exception(server, err, exception);
10222 	}
10223 }
10224 
10225 /**
10226  * nfs41_test_stateid - perform a TEST_STATEID operation
10227  *
10228  * @server: server / transport on which to perform the operation
10229  * @stateid: state ID to test
10230  * @cred: credential
10231  *
10232  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10233  * Otherwise a negative NFS4ERR value is returned if the operation
10234  * failed or the state ID is not currently valid.
10235  */
nfs41_test_stateid(struct nfs_server * server,nfs4_stateid * stateid,const struct cred * cred)10236 static int nfs41_test_stateid(struct nfs_server *server,
10237 		nfs4_stateid *stateid,
10238 		const struct cred *cred)
10239 {
10240 	struct nfs4_exception exception = {
10241 		.interruptible = true,
10242 	};
10243 	int err;
10244 	do {
10245 		err = _nfs41_test_stateid(server, stateid, cred);
10246 		nfs4_handle_delay_or_session_error(server, err, &exception);
10247 	} while (exception.retry);
10248 	return err;
10249 }
10250 
10251 struct nfs_free_stateid_data {
10252 	struct nfs_server *server;
10253 	struct nfs41_free_stateid_args args;
10254 	struct nfs41_free_stateid_res res;
10255 };
10256 
nfs41_free_stateid_prepare(struct rpc_task * task,void * calldata)10257 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10258 {
10259 	struct nfs_free_stateid_data *data = calldata;
10260 	nfs4_setup_sequence(data->server->nfs_client,
10261 			&data->args.seq_args,
10262 			&data->res.seq_res,
10263 			task);
10264 }
10265 
nfs41_free_stateid_done(struct rpc_task * task,void * calldata)10266 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10267 {
10268 	struct nfs_free_stateid_data *data = calldata;
10269 
10270 	nfs41_sequence_done(task, &data->res.seq_res);
10271 
10272 	switch (task->tk_status) {
10273 	case -NFS4ERR_DELAY:
10274 		if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10275 			rpc_restart_call_prepare(task);
10276 	}
10277 }
10278 
nfs41_free_stateid_release(void * calldata)10279 static void nfs41_free_stateid_release(void *calldata)
10280 {
10281 	struct nfs_free_stateid_data *data = calldata;
10282 	struct nfs_client *clp = data->server->nfs_client;
10283 
10284 	nfs_put_client(clp);
10285 	kfree(calldata);
10286 }
10287 
10288 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10289 	.rpc_call_prepare = nfs41_free_stateid_prepare,
10290 	.rpc_call_done = nfs41_free_stateid_done,
10291 	.rpc_release = nfs41_free_stateid_release,
10292 };
10293 
10294 /**
10295  * nfs41_free_stateid - perform a FREE_STATEID operation
10296  *
10297  * @server: server / transport on which to perform the operation
10298  * @stateid: state ID to release
10299  * @cred: credential
10300  * @privileged: set to true if this call needs to be privileged
10301  *
10302  * Note: this function is always asynchronous.
10303  */
nfs41_free_stateid(struct nfs_server * server,const nfs4_stateid * stateid,const struct cred * cred,bool privileged)10304 static int nfs41_free_stateid(struct nfs_server *server,
10305 		const nfs4_stateid *stateid,
10306 		const struct cred *cred,
10307 		bool privileged)
10308 {
10309 	struct rpc_message msg = {
10310 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10311 		.rpc_cred = cred,
10312 	};
10313 	struct rpc_task_setup task_setup = {
10314 		.rpc_client = server->client,
10315 		.rpc_message = &msg,
10316 		.callback_ops = &nfs41_free_stateid_ops,
10317 		.flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10318 	};
10319 	struct nfs_free_stateid_data *data;
10320 	struct rpc_task *task;
10321 	struct nfs_client *clp = server->nfs_client;
10322 
10323 	if (!refcount_inc_not_zero(&clp->cl_count))
10324 		return -EIO;
10325 
10326 	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10327 		&task_setup.rpc_client, &msg);
10328 
10329 	dprintk("NFS call  free_stateid %p\n", stateid);
10330 	data = kmalloc(sizeof(*data), GFP_KERNEL);
10331 	if (!data)
10332 		return -ENOMEM;
10333 	data->server = server;
10334 	nfs4_stateid_copy(&data->args.stateid, stateid);
10335 
10336 	task_setup.callback_data = data;
10337 
10338 	msg.rpc_argp = &data->args;
10339 	msg.rpc_resp = &data->res;
10340 	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10341 	task = rpc_run_task(&task_setup);
10342 	if (IS_ERR(task))
10343 		return PTR_ERR(task);
10344 	rpc_put_task(task);
10345 	return 0;
10346 }
10347 
10348 static void
nfs41_free_lock_state(struct nfs_server * server,struct nfs4_lock_state * lsp)10349 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10350 {
10351 	const struct cred *cred = lsp->ls_state->owner->so_cred;
10352 
10353 	nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10354 	nfs4_free_lock_state(server, lsp);
10355 }
10356 
nfs41_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10357 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10358 		const nfs4_stateid *s2)
10359 {
10360 	if (s1->type != s2->type)
10361 		return false;
10362 
10363 	if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10364 		return false;
10365 
10366 	if (s1->seqid == s2->seqid)
10367 		return true;
10368 
10369 	return s1->seqid == 0 || s2->seqid == 0;
10370 }
10371 
10372 #endif /* CONFIG_NFS_V4_1 */
10373 
nfs4_match_stateid(const nfs4_stateid * s1,const nfs4_stateid * s2)10374 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10375 		const nfs4_stateid *s2)
10376 {
10377 	return nfs4_stateid_match(s1, s2);
10378 }
10379 
10380 
10381 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10382 	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10383 	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
10384 	.recover_open	= nfs4_open_reclaim,
10385 	.recover_lock	= nfs4_lock_reclaim,
10386 	.establish_clid = nfs4_init_clientid,
10387 	.detect_trunking = nfs40_discover_server_trunking,
10388 };
10389 
10390 #if defined(CONFIG_NFS_V4_1)
10391 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10392 	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10393 	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
10394 	.recover_open	= nfs4_open_reclaim,
10395 	.recover_lock	= nfs4_lock_reclaim,
10396 	.establish_clid = nfs41_init_clientid,
10397 	.reclaim_complete = nfs41_proc_reclaim_complete,
10398 	.detect_trunking = nfs41_discover_server_trunking,
10399 };
10400 #endif /* CONFIG_NFS_V4_1 */
10401 
10402 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10403 	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10404 	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
10405 	.recover_open	= nfs40_open_expired,
10406 	.recover_lock	= nfs4_lock_expired,
10407 	.establish_clid = nfs4_init_clientid,
10408 };
10409 
10410 #if defined(CONFIG_NFS_V4_1)
10411 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10412 	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10413 	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
10414 	.recover_open	= nfs41_open_expired,
10415 	.recover_lock	= nfs41_lock_expired,
10416 	.establish_clid = nfs41_init_clientid,
10417 };
10418 #endif /* CONFIG_NFS_V4_1 */
10419 
10420 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10421 	.sched_state_renewal = nfs4_proc_async_renew,
10422 	.get_state_renewal_cred = nfs4_get_renew_cred,
10423 	.renew_lease = nfs4_proc_renew,
10424 };
10425 
10426 #if defined(CONFIG_NFS_V4_1)
10427 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10428 	.sched_state_renewal = nfs41_proc_async_sequence,
10429 	.get_state_renewal_cred = nfs4_get_machine_cred,
10430 	.renew_lease = nfs4_proc_sequence,
10431 };
10432 #endif
10433 
10434 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10435 	.get_locations = _nfs40_proc_get_locations,
10436 	.fsid_present = _nfs40_proc_fsid_present,
10437 };
10438 
10439 #if defined(CONFIG_NFS_V4_1)
10440 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10441 	.get_locations = _nfs41_proc_get_locations,
10442 	.fsid_present = _nfs41_proc_fsid_present,
10443 };
10444 #endif	/* CONFIG_NFS_V4_1 */
10445 
10446 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10447 	.minor_version = 0,
10448 	.init_caps = NFS_CAP_READDIRPLUS
10449 		| NFS_CAP_ATOMIC_OPEN
10450 		| NFS_CAP_POSIX_LOCK,
10451 	.init_client = nfs40_init_client,
10452 	.shutdown_client = nfs40_shutdown_client,
10453 	.match_stateid = nfs4_match_stateid,
10454 	.find_root_sec = nfs4_find_root_sec,
10455 	.free_lock_state = nfs4_release_lockowner,
10456 	.test_and_free_expired = nfs40_test_and_free_expired_stateid,
10457 	.alloc_seqid = nfs_alloc_seqid,
10458 	.call_sync_ops = &nfs40_call_sync_ops,
10459 	.reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10460 	.nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10461 	.state_renewal_ops = &nfs40_state_renewal_ops,
10462 	.mig_recovery_ops = &nfs40_mig_recovery_ops,
10463 };
10464 
10465 #if defined(CONFIG_NFS_V4_1)
10466 static struct nfs_seqid *
nfs_alloc_no_seqid(struct nfs_seqid_counter * arg1,gfp_t arg2)10467 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10468 {
10469 	return NULL;
10470 }
10471 
10472 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10473 	.minor_version = 1,
10474 	.init_caps = NFS_CAP_READDIRPLUS
10475 		| NFS_CAP_ATOMIC_OPEN
10476 		| NFS_CAP_POSIX_LOCK
10477 		| NFS_CAP_STATEID_NFSV41
10478 		| NFS_CAP_ATOMIC_OPEN_V1
10479 		| NFS_CAP_LGOPEN
10480 		| NFS_CAP_MOVEABLE,
10481 	.init_client = nfs41_init_client,
10482 	.shutdown_client = nfs41_shutdown_client,
10483 	.match_stateid = nfs41_match_stateid,
10484 	.find_root_sec = nfs41_find_root_sec,
10485 	.free_lock_state = nfs41_free_lock_state,
10486 	.test_and_free_expired = nfs41_test_and_free_expired_stateid,
10487 	.alloc_seqid = nfs_alloc_no_seqid,
10488 	.session_trunk = nfs4_test_session_trunk,
10489 	.call_sync_ops = &nfs41_call_sync_ops,
10490 	.reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10491 	.nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10492 	.state_renewal_ops = &nfs41_state_renewal_ops,
10493 	.mig_recovery_ops = &nfs41_mig_recovery_ops,
10494 };
10495 #endif
10496 
10497 #if defined(CONFIG_NFS_V4_2)
10498 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10499 	.minor_version = 2,
10500 	.init_caps = NFS_CAP_READDIRPLUS
10501 		| NFS_CAP_ATOMIC_OPEN
10502 		| NFS_CAP_POSIX_LOCK
10503 		| NFS_CAP_STATEID_NFSV41
10504 		| NFS_CAP_ATOMIC_OPEN_V1
10505 		| NFS_CAP_LGOPEN
10506 		| NFS_CAP_ALLOCATE
10507 		| NFS_CAP_COPY
10508 		| NFS_CAP_OFFLOAD_CANCEL
10509 		| NFS_CAP_COPY_NOTIFY
10510 		| NFS_CAP_DEALLOCATE
10511 		| NFS_CAP_SEEK
10512 		| NFS_CAP_LAYOUTSTATS
10513 		| NFS_CAP_CLONE
10514 		| NFS_CAP_LAYOUTERROR
10515 		| NFS_CAP_READ_PLUS
10516 		| NFS_CAP_MOVEABLE,
10517 	.init_client = nfs41_init_client,
10518 	.shutdown_client = nfs41_shutdown_client,
10519 	.match_stateid = nfs41_match_stateid,
10520 	.find_root_sec = nfs41_find_root_sec,
10521 	.free_lock_state = nfs41_free_lock_state,
10522 	.call_sync_ops = &nfs41_call_sync_ops,
10523 	.test_and_free_expired = nfs41_test_and_free_expired_stateid,
10524 	.alloc_seqid = nfs_alloc_no_seqid,
10525 	.session_trunk = nfs4_test_session_trunk,
10526 	.reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10527 	.nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10528 	.state_renewal_ops = &nfs41_state_renewal_ops,
10529 	.mig_recovery_ops = &nfs41_mig_recovery_ops,
10530 };
10531 #endif
10532 
10533 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10534 	[0] = &nfs_v4_0_minor_ops,
10535 #if defined(CONFIG_NFS_V4_1)
10536 	[1] = &nfs_v4_1_minor_ops,
10537 #endif
10538 #if defined(CONFIG_NFS_V4_2)
10539 	[2] = &nfs_v4_2_minor_ops,
10540 #endif
10541 };
10542 
nfs4_listxattr(struct dentry * dentry,char * list,size_t size)10543 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10544 {
10545 	ssize_t error, error2, error3;
10546 
10547 	error = generic_listxattr(dentry, list, size);
10548 	if (error < 0)
10549 		return error;
10550 	if (list) {
10551 		list += error;
10552 		size -= error;
10553 	}
10554 
10555 	error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10556 	if (error2 < 0)
10557 		return error2;
10558 
10559 	if (list) {
10560 		list += error2;
10561 		size -= error2;
10562 	}
10563 
10564 	error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10565 	if (error3 < 0)
10566 		return error3;
10567 
10568 	return error + error2 + error3;
10569 }
10570 
nfs4_enable_swap(struct inode * inode)10571 static void nfs4_enable_swap(struct inode *inode)
10572 {
10573 	/* The state manager thread must always be running.
10574 	 * It will notice the client is a swapper, and stay put.
10575 	 */
10576 	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10577 
10578 	nfs4_schedule_state_manager(clp);
10579 }
10580 
nfs4_disable_swap(struct inode * inode)10581 static void nfs4_disable_swap(struct inode *inode)
10582 {
10583 	/* The state manager thread will now exit once it is
10584 	 * woken.
10585 	 */
10586 	wake_up_var(&NFS_SERVER(inode)->nfs_client->cl_state);
10587 }
10588 
10589 static const struct inode_operations nfs4_dir_inode_operations = {
10590 	.create		= nfs_create,
10591 	.lookup		= nfs_lookup,
10592 	.atomic_open	= nfs_atomic_open,
10593 	.link		= nfs_link,
10594 	.unlink		= nfs_unlink,
10595 	.symlink	= nfs_symlink,
10596 	.mkdir		= nfs_mkdir,
10597 	.rmdir		= nfs_rmdir,
10598 	.mknod		= nfs_mknod,
10599 	.rename		= nfs_rename,
10600 	.permission	= nfs_permission,
10601 	.getattr	= nfs_getattr,
10602 	.setattr	= nfs_setattr,
10603 	.listxattr	= nfs4_listxattr,
10604 };
10605 
10606 static const struct inode_operations nfs4_file_inode_operations = {
10607 	.permission	= nfs_permission,
10608 	.getattr	= nfs_getattr,
10609 	.setattr	= nfs_setattr,
10610 	.listxattr	= nfs4_listxattr,
10611 };
10612 
10613 const struct nfs_rpc_ops nfs_v4_clientops = {
10614 	.version	= 4,			/* protocol version */
10615 	.dentry_ops	= &nfs4_dentry_operations,
10616 	.dir_inode_ops	= &nfs4_dir_inode_operations,
10617 	.file_inode_ops	= &nfs4_file_inode_operations,
10618 	.file_ops	= &nfs4_file_operations,
10619 	.getroot	= nfs4_proc_get_root,
10620 	.submount	= nfs4_submount,
10621 	.try_get_tree	= nfs4_try_get_tree,
10622 	.getattr	= nfs4_proc_getattr,
10623 	.setattr	= nfs4_proc_setattr,
10624 	.lookup		= nfs4_proc_lookup,
10625 	.lookupp	= nfs4_proc_lookupp,
10626 	.access		= nfs4_proc_access,
10627 	.readlink	= nfs4_proc_readlink,
10628 	.create		= nfs4_proc_create,
10629 	.remove		= nfs4_proc_remove,
10630 	.unlink_setup	= nfs4_proc_unlink_setup,
10631 	.unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10632 	.unlink_done	= nfs4_proc_unlink_done,
10633 	.rename_setup	= nfs4_proc_rename_setup,
10634 	.rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10635 	.rename_done	= nfs4_proc_rename_done,
10636 	.link		= nfs4_proc_link,
10637 	.symlink	= nfs4_proc_symlink,
10638 	.mkdir		= nfs4_proc_mkdir,
10639 	.rmdir		= nfs4_proc_rmdir,
10640 	.readdir	= nfs4_proc_readdir,
10641 	.mknod		= nfs4_proc_mknod,
10642 	.statfs		= nfs4_proc_statfs,
10643 	.fsinfo		= nfs4_proc_fsinfo,
10644 	.pathconf	= nfs4_proc_pathconf,
10645 	.set_capabilities = nfs4_server_capabilities,
10646 	.decode_dirent	= nfs4_decode_dirent,
10647 	.pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10648 	.read_setup	= nfs4_proc_read_setup,
10649 	.read_done	= nfs4_read_done,
10650 	.write_setup	= nfs4_proc_write_setup,
10651 	.write_done	= nfs4_write_done,
10652 	.commit_setup	= nfs4_proc_commit_setup,
10653 	.commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10654 	.commit_done	= nfs4_commit_done,
10655 	.lock		= nfs4_proc_lock,
10656 	.clear_acl_cache = nfs4_zap_acl_attr,
10657 	.close_context  = nfs4_close_context,
10658 	.open_context	= nfs4_atomic_open,
10659 	.have_delegation = nfs4_have_delegation,
10660 	.alloc_client	= nfs4_alloc_client,
10661 	.init_client	= nfs4_init_client,
10662 	.free_client	= nfs4_free_client,
10663 	.create_server	= nfs4_create_server,
10664 	.clone_server	= nfs_clone_server,
10665 	.discover_trunking = nfs4_discover_trunking,
10666 	.enable_swap	= nfs4_enable_swap,
10667 	.disable_swap	= nfs4_disable_swap,
10668 };
10669 
10670 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10671 	.name	= XATTR_NAME_NFSV4_ACL,
10672 	.list	= nfs4_xattr_list_nfs4_acl,
10673 	.get	= nfs4_xattr_get_nfs4_acl,
10674 	.set	= nfs4_xattr_set_nfs4_acl,
10675 };
10676 
10677 #if defined(CONFIG_NFS_V4_1)
10678 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10679 	.name	= XATTR_NAME_NFSV4_DACL,
10680 	.list	= nfs4_xattr_list_nfs4_dacl,
10681 	.get	= nfs4_xattr_get_nfs4_dacl,
10682 	.set	= nfs4_xattr_set_nfs4_dacl,
10683 };
10684 
10685 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10686 	.name	= XATTR_NAME_NFSV4_SACL,
10687 	.list	= nfs4_xattr_list_nfs4_sacl,
10688 	.get	= nfs4_xattr_get_nfs4_sacl,
10689 	.set	= nfs4_xattr_set_nfs4_sacl,
10690 };
10691 #endif
10692 
10693 #ifdef CONFIG_NFS_V4_2
10694 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10695 	.prefix	= XATTR_USER_PREFIX,
10696 	.get	= nfs4_xattr_get_nfs4_user,
10697 	.set	= nfs4_xattr_set_nfs4_user,
10698 };
10699 #endif
10700 
10701 const struct xattr_handler *nfs4_xattr_handlers[] = {
10702 	&nfs4_xattr_nfs4_acl_handler,
10703 #if defined(CONFIG_NFS_V4_1)
10704 	&nfs4_xattr_nfs4_dacl_handler,
10705 	&nfs4_xattr_nfs4_sacl_handler,
10706 #endif
10707 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10708 	&nfs4_xattr_nfs4_label_handler,
10709 #endif
10710 #ifdef CONFIG_NFS_V4_2
10711 	&nfs4_xattr_nfs4_user_handler,
10712 #endif
10713 	NULL
10714 };
10715