1 /*
2  *  Server-side procedures for NFSv4.
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  */
35 #include <linux/fs_struct.h>
36 #include <linux/file.h>
37 #include <linux/falloc.h>
38 #include <linux/slab.h>
39 #include <linux/kthread.h>
40 #include <linux/namei.h>
41 
42 #include <linux/sunrpc/addr.h>
43 #include <linux/nfs_ssc.h>
44 
45 #include "idmap.h"
46 #include "cache.h"
47 #include "xdr4.h"
48 #include "vfs.h"
49 #include "current_stateid.h"
50 #include "netns.h"
51 #include "acl.h"
52 #include "pnfs.h"
53 #include "trace.h"
54 
55 static bool inter_copy_offload_enable;
56 module_param(inter_copy_offload_enable, bool, 0644);
57 MODULE_PARM_DESC(inter_copy_offload_enable,
58 		 "Enable inter server to server copy offload. Default: false");
59 
60 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
61 static int nfsd4_ssc_umount_timeout = 900000;		/* default to 15 mins */
62 module_param(nfsd4_ssc_umount_timeout, int, 0644);
63 MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
64 		"idle msecs before unmount export from source server");
65 #endif
66 
67 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
68 #include <linux/security.h>
69 
70 static inline void
nfsd4_security_inode_setsecctx(struct svc_fh * resfh,struct xdr_netobj * label,u32 * bmval)71 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
72 {
73 	struct inode *inode = d_inode(resfh->fh_dentry);
74 	int status;
75 
76 	inode_lock(inode);
77 	status = security_inode_setsecctx(resfh->fh_dentry,
78 		label->data, label->len);
79 	inode_unlock(inode);
80 
81 	if (status)
82 		/*
83 		 * XXX: We should really fail the whole open, but we may
84 		 * already have created a new file, so it may be too
85 		 * late.  For now this seems the least of evils:
86 		 */
87 		bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
88 
89 	return;
90 }
91 #else
92 static inline void
nfsd4_security_inode_setsecctx(struct svc_fh * resfh,struct xdr_netobj * label,u32 * bmval)93 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
94 { }
95 #endif
96 
97 #define NFSDDBG_FACILITY		NFSDDBG_PROC
98 
99 static u32 nfsd_attrmask[] = {
100 	NFSD_WRITEABLE_ATTRS_WORD0,
101 	NFSD_WRITEABLE_ATTRS_WORD1,
102 	NFSD_WRITEABLE_ATTRS_WORD2
103 };
104 
105 static u32 nfsd41_ex_attrmask[] = {
106 	NFSD_SUPPATTR_EXCLCREAT_WORD0,
107 	NFSD_SUPPATTR_EXCLCREAT_WORD1,
108 	NFSD_SUPPATTR_EXCLCREAT_WORD2
109 };
110 
111 static __be32
check_attr_support(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,u32 * bmval,u32 * writable)112 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
113 		   u32 *bmval, u32 *writable)
114 {
115 	struct dentry *dentry = cstate->current_fh.fh_dentry;
116 	struct svc_export *exp = cstate->current_fh.fh_export;
117 
118 	if (!nfsd_attrs_supported(cstate->minorversion, bmval))
119 		return nfserr_attrnotsupp;
120 	if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
121 		return nfserr_attrnotsupp;
122 	if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
123 			!(exp->ex_flags & NFSEXP_SECURITY_LABEL))
124 		return nfserr_attrnotsupp;
125 	if (writable && !bmval_is_subset(bmval, writable))
126 		return nfserr_inval;
127 	if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
128 			(bmval[1] & FATTR4_WORD1_MODE))
129 		return nfserr_inval;
130 	return nfs_ok;
131 }
132 
133 static __be32
nfsd4_check_open_attributes(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_open * open)134 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
135 	struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
136 {
137 	__be32 status = nfs_ok;
138 
139 	if (open->op_create == NFS4_OPEN_CREATE) {
140 		if (open->op_createmode == NFS4_CREATE_UNCHECKED
141 		    || open->op_createmode == NFS4_CREATE_GUARDED)
142 			status = check_attr_support(rqstp, cstate,
143 					open->op_bmval, nfsd_attrmask);
144 		else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
145 			status = check_attr_support(rqstp, cstate,
146 					open->op_bmval, nfsd41_ex_attrmask);
147 	}
148 
149 	return status;
150 }
151 
152 static int
is_create_with_attrs(struct nfsd4_open * open)153 is_create_with_attrs(struct nfsd4_open *open)
154 {
155 	return open->op_create == NFS4_OPEN_CREATE
156 		&& (open->op_createmode == NFS4_CREATE_UNCHECKED
157 		    || open->op_createmode == NFS4_CREATE_GUARDED
158 		    || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
159 }
160 
161 /*
162  * if error occurs when setting the acl, just clear the acl bit
163  * in the returned attr bitmap.
164  */
165 static void
do_set_nfs4_acl(struct svc_rqst * rqstp,struct svc_fh * fhp,struct nfs4_acl * acl,u32 * bmval)166 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
167 		struct nfs4_acl *acl, u32 *bmval)
168 {
169 	__be32 status;
170 
171 	status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
172 	if (status)
173 		/*
174 		 * We should probably fail the whole open at this point,
175 		 * but we've already created the file, so it's too late;
176 		 * So this seems the least of evils:
177 		 */
178 		bmval[0] &= ~FATTR4_WORD0_ACL;
179 }
180 
181 static inline void
fh_dup2(struct svc_fh * dst,struct svc_fh * src)182 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
183 {
184 	fh_put(dst);
185 	dget(src->fh_dentry);
186 	if (src->fh_export)
187 		exp_get(src->fh_export);
188 	*dst = *src;
189 }
190 
191 static __be32
do_open_permission(struct svc_rqst * rqstp,struct svc_fh * current_fh,struct nfsd4_open * open,int accmode)192 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
193 {
194 	__be32 status;
195 
196 	if (open->op_truncate &&
197 		!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
198 		return nfserr_inval;
199 
200 	accmode |= NFSD_MAY_READ_IF_EXEC;
201 
202 	if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
203 		accmode |= NFSD_MAY_READ;
204 	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
205 		accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
206 	if (open->op_share_deny & NFS4_SHARE_DENY_READ)
207 		accmode |= NFSD_MAY_WRITE;
208 
209 	status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
210 
211 	return status;
212 }
213 
nfsd_check_obj_isreg(struct svc_fh * fh)214 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
215 {
216 	umode_t mode = d_inode(fh->fh_dentry)->i_mode;
217 
218 	if (S_ISREG(mode))
219 		return nfs_ok;
220 	if (S_ISDIR(mode))
221 		return nfserr_isdir;
222 	/*
223 	 * Using err_symlink as our catch-all case may look odd; but
224 	 * there's no other obvious error for this case in 4.0, and we
225 	 * happen to know that it will cause the linux v4 client to do
226 	 * the right thing on attempts to open something other than a
227 	 * regular file.
228 	 */
229 	return nfserr_symlink;
230 }
231 
nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state * cstate,struct nfsd4_open * open,struct svc_fh * resfh)232 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
233 {
234 	if (nfsd4_has_session(cstate))
235 		return;
236 	fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
237 			&resfh->fh_handle);
238 }
239 
nfsd4_create_is_exclusive(int createmode)240 static inline bool nfsd4_create_is_exclusive(int createmode)
241 {
242 	return createmode == NFS4_CREATE_EXCLUSIVE ||
243 		createmode == NFS4_CREATE_EXCLUSIVE4_1;
244 }
245 
246 static __be32
nfsd4_vfs_create(struct svc_fh * fhp,struct dentry * child,struct nfsd4_open * open)247 nfsd4_vfs_create(struct svc_fh *fhp, struct dentry *child,
248 		 struct nfsd4_open *open)
249 {
250 	struct file *filp;
251 	struct path path;
252 	int oflags;
253 
254 	oflags = O_CREAT | O_LARGEFILE;
255 	switch (open->op_share_access & NFS4_SHARE_ACCESS_BOTH) {
256 	case NFS4_SHARE_ACCESS_WRITE:
257 		oflags |= O_WRONLY;
258 		break;
259 	case NFS4_SHARE_ACCESS_BOTH:
260 		oflags |= O_RDWR;
261 		break;
262 	default:
263 		oflags |= O_RDONLY;
264 	}
265 
266 	path.mnt = fhp->fh_export->ex_path.mnt;
267 	path.dentry = child;
268 	filp = dentry_create(&path, oflags, open->op_iattr.ia_mode,
269 			     current_cred());
270 	if (IS_ERR(filp))
271 		return nfserrno(PTR_ERR(filp));
272 
273 	open->op_filp = filp;
274 	return nfs_ok;
275 }
276 
277 /*
278  * Implement NFSv4's unchecked, guarded, and exclusive create
279  * semantics for regular files. Open state for this new file is
280  * subsequently fabricated in nfsd4_process_open2().
281  *
282  * Upon return, caller must release @fhp and @resfhp.
283  */
284 static __be32
nfsd4_create_file(struct svc_rqst * rqstp,struct svc_fh * fhp,struct svc_fh * resfhp,struct nfsd4_open * open)285 nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
286 		  struct svc_fh *resfhp, struct nfsd4_open *open)
287 {
288 	struct iattr *iap = &open->op_iattr;
289 	struct dentry *parent, *child;
290 	__u32 v_mtime, v_atime;
291 	struct inode *inode;
292 	__be32 status;
293 	int host_err;
294 
295 	if (isdotent(open->op_fname, open->op_fnamelen))
296 		return nfserr_exist;
297 	if (!(iap->ia_valid & ATTR_MODE))
298 		iap->ia_mode = 0;
299 
300 	status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
301 	if (status != nfs_ok)
302 		return status;
303 	parent = fhp->fh_dentry;
304 	inode = d_inode(parent);
305 
306 	host_err = fh_want_write(fhp);
307 	if (host_err)
308 		return nfserrno(host_err);
309 
310 	fh_lock_nested(fhp, I_MUTEX_PARENT);
311 
312 	child = lookup_one_len(open->op_fname, parent, open->op_fnamelen);
313 	if (IS_ERR(child)) {
314 		status = nfserrno(PTR_ERR(child));
315 		goto out;
316 	}
317 
318 	if (d_really_is_negative(child)) {
319 		status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
320 		if (status != nfs_ok)
321 			goto out;
322 	}
323 
324 	status = fh_compose(resfhp, fhp->fh_export, child, fhp);
325 	if (status != nfs_ok)
326 		goto out;
327 
328 	v_mtime = 0;
329 	v_atime = 0;
330 	if (nfsd4_create_is_exclusive(open->op_createmode)) {
331 		u32 *verifier = (u32 *)open->op_verf.data;
332 
333 		/*
334 		 * Solaris 7 gets confused (bugid 4218508) if these have
335 		 * the high bit set, as do xfs filesystems without the
336 		 * "bigtime" feature. So just clear the high bits. If this
337 		 * is ever changed to use different attrs for storing the
338 		 * verifier, then do_open_lookup() will also need to be
339 		 * fixed accordingly.
340 		 */
341 		v_mtime = verifier[0] & 0x7fffffff;
342 		v_atime = verifier[1] & 0x7fffffff;
343 	}
344 
345 	if (d_really_is_positive(child)) {
346 		status = nfs_ok;
347 
348 		switch (open->op_createmode) {
349 		case NFS4_CREATE_UNCHECKED:
350 			if (!d_is_reg(child))
351 				break;
352 
353 			/*
354 			 * In NFSv4, we don't want to truncate the file
355 			 * now. This would be wrong if the OPEN fails for
356 			 * some other reason. Furthermore, if the size is
357 			 * nonzero, we should ignore it according to spec!
358 			 */
359 			open->op_truncate = (iap->ia_valid & ATTR_SIZE) &&
360 						!iap->ia_size;
361 			break;
362 		case NFS4_CREATE_GUARDED:
363 			status = nfserr_exist;
364 			break;
365 		case NFS4_CREATE_EXCLUSIVE:
366 			if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
367 			    d_inode(child)->i_atime.tv_sec == v_atime &&
368 			    d_inode(child)->i_size == 0) {
369 				open->op_created = true;
370 				break;		/* subtle */
371 			}
372 			status = nfserr_exist;
373 			break;
374 		case NFS4_CREATE_EXCLUSIVE4_1:
375 			if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
376 			    d_inode(child)->i_atime.tv_sec == v_atime &&
377 			    d_inode(child)->i_size == 0) {
378 				open->op_created = true;
379 				goto set_attr;	/* subtle */
380 			}
381 			status = nfserr_exist;
382 		}
383 		goto out;
384 	}
385 
386 	if (!IS_POSIXACL(inode))
387 		iap->ia_mode &= ~current_umask();
388 
389 	status = nfsd4_vfs_create(fhp, child, open);
390 	if (status != nfs_ok)
391 		goto out;
392 	open->op_created = true;
393 
394 	/* A newly created file already has a file size of zero. */
395 	if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
396 		iap->ia_valid &= ~ATTR_SIZE;
397 	if (nfsd4_create_is_exclusive(open->op_createmode)) {
398 		iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
399 				ATTR_MTIME_SET|ATTR_ATIME_SET;
400 		iap->ia_mtime.tv_sec = v_mtime;
401 		iap->ia_atime.tv_sec = v_atime;
402 		iap->ia_mtime.tv_nsec = 0;
403 		iap->ia_atime.tv_nsec = 0;
404 	}
405 
406 set_attr:
407 	status = nfsd_create_setattr(rqstp, fhp, resfhp, iap);
408 
409 out:
410 	fh_unlock(fhp);
411 	if (child && !IS_ERR(child))
412 		dput(child);
413 	fh_drop_write(fhp);
414 	return status;
415 }
416 
417 static __be32
do_open_lookup(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_open * open,struct svc_fh ** resfh)418 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
419 {
420 	struct svc_fh *current_fh = &cstate->current_fh;
421 	int accmode;
422 	__be32 status;
423 
424 	*resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
425 	if (!*resfh)
426 		return nfserr_jukebox;
427 	fh_init(*resfh, NFS4_FHSIZE);
428 	open->op_truncate = false;
429 
430 	if (open->op_create) {
431 		/* FIXME: check session persistence and pnfs flags.
432 		 * The nfsv4.1 spec requires the following semantics:
433 		 *
434 		 * Persistent   | pNFS   | Server REQUIRED | Client Allowed
435 		 * Reply Cache  | server |                 |
436 		 * -------------+--------+-----------------+--------------------
437 		 * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
438 		 *              |        |                 | (SHOULD)
439 		 *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
440 		 *              |        |                 | (SHOULD NOT)
441 		 * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
442 		 * yes          | no     | GUARDED4        | GUARDED4
443 		 * yes          | yes    | GUARDED4        | GUARDED4
444 		 */
445 
446 		current->fs->umask = open->op_umask;
447 		status = nfsd4_create_file(rqstp, current_fh, *resfh, open);
448 		current->fs->umask = 0;
449 
450 		if (!status && open->op_label.len)
451 			nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
452 
453 		/*
454 		 * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
455 		 * use the returned bitmask to indicate which attributes
456 		 * we used to store the verifier:
457 		 */
458 		if (nfsd4_create_is_exclusive(open->op_createmode) && status == 0)
459 			open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
460 						FATTR4_WORD1_TIME_MODIFY);
461 	} else
462 		/*
463 		 * Note this may exit with the parent still locked.
464 		 * We will hold the lock until nfsd4_open's final
465 		 * lookup, to prevent renames or unlinks until we've had
466 		 * a chance to an acquire a delegation if appropriate.
467 		 */
468 		status = nfsd_lookup(rqstp, current_fh,
469 				     open->op_fname, open->op_fnamelen, *resfh);
470 	if (status)
471 		goto out;
472 	status = nfsd_check_obj_isreg(*resfh);
473 	if (status)
474 		goto out;
475 
476 	if (is_create_with_attrs(open) && open->op_acl != NULL)
477 		do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
478 
479 	nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
480 	accmode = NFSD_MAY_NOP;
481 	if (open->op_created ||
482 			open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
483 		accmode |= NFSD_MAY_OWNER_OVERRIDE;
484 	status = do_open_permission(rqstp, *resfh, open, accmode);
485 	set_change_info(&open->op_cinfo, current_fh);
486 out:
487 	return status;
488 }
489 
490 static __be32
do_open_fhandle(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_open * open)491 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
492 {
493 	struct svc_fh *current_fh = &cstate->current_fh;
494 	__be32 status;
495 	int accmode = 0;
496 
497 	/* We don't know the target directory, and therefore can not
498 	* set the change info
499 	*/
500 
501 	memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
502 
503 	nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
504 
505 	open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
506 		(open->op_iattr.ia_size == 0);
507 	/*
508 	 * In the delegation case, the client is telling us about an
509 	 * open that it *already* performed locally, some time ago.  We
510 	 * should let it succeed now if possible.
511 	 *
512 	 * In the case of a CLAIM_FH open, on the other hand, the client
513 	 * may be counting on us to enforce permissions (the Linux 4.1
514 	 * client uses this for normal opens, for example).
515 	 */
516 	if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
517 		accmode = NFSD_MAY_OWNER_OVERRIDE;
518 
519 	status = do_open_permission(rqstp, current_fh, open, accmode);
520 
521 	return status;
522 }
523 
524 static void
copy_clientid(clientid_t * clid,struct nfsd4_session * session)525 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
526 {
527 	struct nfsd4_sessionid *sid =
528 			(struct nfsd4_sessionid *)session->se_sessionid.data;
529 
530 	clid->cl_boot = sid->clientid.cl_boot;
531 	clid->cl_id = sid->clientid.cl_id;
532 }
533 
534 static __be32
nfsd4_open(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)535 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
536 	   union nfsd4_op_u *u)
537 {
538 	struct nfsd4_open *open = &u->open;
539 	__be32 status;
540 	struct svc_fh *resfh = NULL;
541 	struct net *net = SVC_NET(rqstp);
542 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
543 	bool reclaim = false;
544 
545 	dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
546 		(int)open->op_fnamelen, open->op_fname,
547 		open->op_openowner);
548 
549 	open->op_filp = NULL;
550 
551 	/* This check required by spec. */
552 	if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
553 		return nfserr_inval;
554 
555 	open->op_created = false;
556 	/*
557 	 * RFC5661 18.51.3
558 	 * Before RECLAIM_COMPLETE done, server should deny new lock
559 	 */
560 	if (nfsd4_has_session(cstate) &&
561 	    !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags) &&
562 	    open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
563 		return nfserr_grace;
564 
565 	if (nfsd4_has_session(cstate))
566 		copy_clientid(&open->op_clientid, cstate->session);
567 
568 	/* check seqid for replay. set nfs4_owner */
569 	status = nfsd4_process_open1(cstate, open, nn);
570 	if (status == nfserr_replay_me) {
571 		struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
572 		fh_put(&cstate->current_fh);
573 		fh_copy_shallow(&cstate->current_fh.fh_handle,
574 				&rp->rp_openfh);
575 		status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
576 		if (status)
577 			dprintk("nfsd4_open: replay failed"
578 				" restoring previous filehandle\n");
579 		else
580 			status = nfserr_replay_me;
581 	}
582 	if (status)
583 		goto out;
584 	if (open->op_xdr_error) {
585 		status = open->op_xdr_error;
586 		goto out;
587 	}
588 
589 	status = nfsd4_check_open_attributes(rqstp, cstate, open);
590 	if (status)
591 		goto out;
592 
593 	/* Openowner is now set, so sequence id will get bumped.  Now we need
594 	 * these checks before we do any creates: */
595 	status = nfserr_grace;
596 	if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
597 		goto out;
598 	status = nfserr_no_grace;
599 	if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
600 		goto out;
601 
602 	switch (open->op_claim_type) {
603 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
604 	case NFS4_OPEN_CLAIM_NULL:
605 		status = do_open_lookup(rqstp, cstate, open, &resfh);
606 		if (status)
607 			goto out;
608 		break;
609 	case NFS4_OPEN_CLAIM_PREVIOUS:
610 		status = nfs4_check_open_reclaim(cstate->clp);
611 		if (status)
612 			goto out;
613 		open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
614 		reclaim = true;
615 		fallthrough;
616 	case NFS4_OPEN_CLAIM_FH:
617 	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
618 		status = do_open_fhandle(rqstp, cstate, open);
619 		if (status)
620 			goto out;
621 		resfh = &cstate->current_fh;
622 		break;
623 	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
624 	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
625 		status = nfserr_notsupp;
626 		goto out;
627 	default:
628 		status = nfserr_inval;
629 		goto out;
630 	}
631 
632 	status = nfsd4_process_open2(rqstp, resfh, open);
633 	WARN(status && open->op_created,
634 	     "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
635 	     be32_to_cpu(status));
636 	if (reclaim && !status)
637 		nn->somebody_reclaimed = true;
638 out:
639 	if (open->op_filp) {
640 		fput(open->op_filp);
641 		open->op_filp = NULL;
642 	}
643 	if (resfh && resfh != &cstate->current_fh) {
644 		fh_dup2(&cstate->current_fh, resfh);
645 		fh_put(resfh);
646 		kfree(resfh);
647 	}
648 	nfsd4_cleanup_open_state(cstate, open);
649 	nfsd4_bump_seqid(cstate, status);
650 	return status;
651 }
652 
653 /*
654  * OPEN is the only seqid-mutating operation whose decoding can fail
655  * with a seqid-mutating error (specifically, decoding of user names in
656  * the attributes).  Therefore we have to do some processing to look up
657  * the stateowner so that we can bump the seqid.
658  */
nfsd4_open_omfg(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_op * op)659 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
660 {
661 	struct nfsd4_open *open = &op->u.open;
662 
663 	if (!seqid_mutating_err(ntohl(op->status)))
664 		return op->status;
665 	if (nfsd4_has_session(cstate))
666 		return op->status;
667 	open->op_xdr_error = op->status;
668 	return nfsd4_open(rqstp, cstate, &op->u);
669 }
670 
671 /*
672  * filehandle-manipulating ops.
673  */
674 static __be32
nfsd4_getfh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)675 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
676 	    union nfsd4_op_u *u)
677 {
678 	u->getfh = &cstate->current_fh;
679 	return nfs_ok;
680 }
681 
682 static __be32
nfsd4_putfh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)683 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
684 	    union nfsd4_op_u *u)
685 {
686 	struct nfsd4_putfh *putfh = &u->putfh;
687 	__be32 ret;
688 
689 	fh_put(&cstate->current_fh);
690 	cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
691 	memcpy(&cstate->current_fh.fh_handle.fh_raw, putfh->pf_fhval,
692 	       putfh->pf_fhlen);
693 	ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
694 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
695 	if (ret == nfserr_stale && putfh->no_verify) {
696 		SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
697 		ret = 0;
698 	}
699 #endif
700 	return ret;
701 }
702 
703 static __be32
nfsd4_putrootfh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)704 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
705 		union nfsd4_op_u *u)
706 {
707 	__be32 status;
708 
709 	fh_put(&cstate->current_fh);
710 	status = exp_pseudoroot(rqstp, &cstate->current_fh);
711 	return status;
712 }
713 
714 static __be32
nfsd4_restorefh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)715 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
716 		union nfsd4_op_u *u)
717 {
718 	if (!cstate->save_fh.fh_dentry)
719 		return nfserr_restorefh;
720 
721 	fh_dup2(&cstate->current_fh, &cstate->save_fh);
722 	if (HAS_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG)) {
723 		memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
724 		SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
725 	}
726 	return nfs_ok;
727 }
728 
729 static __be32
nfsd4_savefh(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)730 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
731 	     union nfsd4_op_u *u)
732 {
733 	fh_dup2(&cstate->save_fh, &cstate->current_fh);
734 	if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG)) {
735 		memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
736 		SET_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG);
737 	}
738 	return nfs_ok;
739 }
740 
741 /*
742  * misc nfsv4 ops
743  */
744 static __be32
nfsd4_access(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)745 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
746 	     union nfsd4_op_u *u)
747 {
748 	struct nfsd4_access *access = &u->access;
749 	u32 access_full;
750 
751 	access_full = NFS3_ACCESS_FULL;
752 	if (cstate->minorversion >= 2)
753 		access_full |= NFS4_ACCESS_XALIST | NFS4_ACCESS_XAREAD |
754 			       NFS4_ACCESS_XAWRITE;
755 
756 	if (access->ac_req_access & ~access_full)
757 		return nfserr_inval;
758 
759 	access->ac_resp_access = access->ac_req_access;
760 	return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
761 			   &access->ac_supported);
762 }
763 
gen_boot_verifier(nfs4_verifier * verifier,struct net * net)764 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
765 {
766 	__be32 *verf = (__be32 *)verifier->data;
767 
768 	BUILD_BUG_ON(2*sizeof(*verf) != sizeof(verifier->data));
769 
770 	nfsd_copy_write_verifier(verf, net_generic(net, nfsd_net_id));
771 }
772 
773 static __be32
nfsd4_commit(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)774 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
775 	     union nfsd4_op_u *u)
776 {
777 	struct nfsd4_commit *commit = &u->commit;
778 
779 	return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
780 			     commit->co_count,
781 			     (__be32 *)commit->co_verf.data);
782 }
783 
784 static __be32
nfsd4_create(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)785 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
786 	     union nfsd4_op_u *u)
787 {
788 	struct nfsd4_create *create = &u->create;
789 	struct svc_fh resfh;
790 	__be32 status;
791 	dev_t rdev;
792 
793 	fh_init(&resfh, NFS4_FHSIZE);
794 
795 	status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
796 	if (status)
797 		return status;
798 
799 	status = check_attr_support(rqstp, cstate, create->cr_bmval,
800 				    nfsd_attrmask);
801 	if (status)
802 		return status;
803 
804 	current->fs->umask = create->cr_umask;
805 	switch (create->cr_type) {
806 	case NF4LNK:
807 		status = nfsd_symlink(rqstp, &cstate->current_fh,
808 				      create->cr_name, create->cr_namelen,
809 				      create->cr_data, &resfh);
810 		break;
811 
812 	case NF4BLK:
813 		status = nfserr_inval;
814 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
815 		if (MAJOR(rdev) != create->cr_specdata1 ||
816 		    MINOR(rdev) != create->cr_specdata2)
817 			goto out_umask;
818 		status = nfsd_create(rqstp, &cstate->current_fh,
819 				     create->cr_name, create->cr_namelen,
820 				     &create->cr_iattr, S_IFBLK, rdev, &resfh);
821 		break;
822 
823 	case NF4CHR:
824 		status = nfserr_inval;
825 		rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
826 		if (MAJOR(rdev) != create->cr_specdata1 ||
827 		    MINOR(rdev) != create->cr_specdata2)
828 			goto out_umask;
829 		status = nfsd_create(rqstp, &cstate->current_fh,
830 				     create->cr_name, create->cr_namelen,
831 				     &create->cr_iattr,S_IFCHR, rdev, &resfh);
832 		break;
833 
834 	case NF4SOCK:
835 		status = nfsd_create(rqstp, &cstate->current_fh,
836 				     create->cr_name, create->cr_namelen,
837 				     &create->cr_iattr, S_IFSOCK, 0, &resfh);
838 		break;
839 
840 	case NF4FIFO:
841 		status = nfsd_create(rqstp, &cstate->current_fh,
842 				     create->cr_name, create->cr_namelen,
843 				     &create->cr_iattr, S_IFIFO, 0, &resfh);
844 		break;
845 
846 	case NF4DIR:
847 		create->cr_iattr.ia_valid &= ~ATTR_SIZE;
848 		status = nfsd_create(rqstp, &cstate->current_fh,
849 				     create->cr_name, create->cr_namelen,
850 				     &create->cr_iattr, S_IFDIR, 0, &resfh);
851 		break;
852 
853 	default:
854 		status = nfserr_badtype;
855 	}
856 
857 	if (status)
858 		goto out;
859 
860 	if (create->cr_label.len)
861 		nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
862 
863 	if (create->cr_acl != NULL)
864 		do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
865 				create->cr_bmval);
866 
867 	fh_unlock(&cstate->current_fh);
868 	set_change_info(&create->cr_cinfo, &cstate->current_fh);
869 	fh_dup2(&cstate->current_fh, &resfh);
870 out:
871 	fh_put(&resfh);
872 out_umask:
873 	current->fs->umask = 0;
874 	return status;
875 }
876 
877 static __be32
nfsd4_getattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)878 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
879 	      union nfsd4_op_u *u)
880 {
881 	struct nfsd4_getattr *getattr = &u->getattr;
882 	__be32 status;
883 
884 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
885 	if (status)
886 		return status;
887 
888 	if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
889 		return nfserr_inval;
890 
891 	getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
892 	getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
893 	getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
894 
895 	getattr->ga_fhp = &cstate->current_fh;
896 	return nfs_ok;
897 }
898 
899 static __be32
nfsd4_link(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)900 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
901 	   union nfsd4_op_u *u)
902 {
903 	struct nfsd4_link *link = &u->link;
904 	__be32 status;
905 
906 	status = nfsd_link(rqstp, &cstate->current_fh,
907 			   link->li_name, link->li_namelen, &cstate->save_fh);
908 	if (!status)
909 		set_change_info(&link->li_cinfo, &cstate->current_fh);
910 	return status;
911 }
912 
nfsd4_do_lookupp(struct svc_rqst * rqstp,struct svc_fh * fh)913 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
914 {
915 	struct svc_fh tmp_fh;
916 	__be32 ret;
917 
918 	fh_init(&tmp_fh, NFS4_FHSIZE);
919 	ret = exp_pseudoroot(rqstp, &tmp_fh);
920 	if (ret)
921 		return ret;
922 	if (tmp_fh.fh_dentry == fh->fh_dentry) {
923 		fh_put(&tmp_fh);
924 		return nfserr_noent;
925 	}
926 	fh_put(&tmp_fh);
927 	return nfsd_lookup(rqstp, fh, "..", 2, fh);
928 }
929 
930 static __be32
nfsd4_lookupp(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)931 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
932 	      union nfsd4_op_u *u)
933 {
934 	return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
935 }
936 
937 static __be32
nfsd4_lookup(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)938 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
939 	     union nfsd4_op_u *u)
940 {
941 	return nfsd_lookup(rqstp, &cstate->current_fh,
942 			   u->lookup.lo_name, u->lookup.lo_len,
943 			   &cstate->current_fh);
944 }
945 
946 static __be32
nfsd4_read(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)947 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
948 	   union nfsd4_op_u *u)
949 {
950 	struct nfsd4_read *read = &u->read;
951 	__be32 status;
952 
953 	read->rd_nf = NULL;
954 
955 	trace_nfsd_read_start(rqstp, &cstate->current_fh,
956 			      read->rd_offset, read->rd_length);
957 
958 	read->rd_length = min_t(u32, read->rd_length, svc_max_payload(rqstp));
959 	if (read->rd_offset > (u64)OFFSET_MAX)
960 		read->rd_offset = (u64)OFFSET_MAX;
961 	if (read->rd_offset + read->rd_length > (u64)OFFSET_MAX)
962 		read->rd_length = (u64)OFFSET_MAX - read->rd_offset;
963 
964 	/*
965 	 * If we do a zero copy read, then a client will see read data
966 	 * that reflects the state of the file *after* performing the
967 	 * following compound.
968 	 *
969 	 * To ensure proper ordering, we therefore turn off zero copy if
970 	 * the client wants us to do more in this compound:
971 	 */
972 	if (!nfsd4_last_compound_op(rqstp))
973 		__clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
974 
975 	/* check stateid */
976 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
977 					&read->rd_stateid, RD_STATE,
978 					&read->rd_nf, NULL);
979 	if (status) {
980 		dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
981 		goto out;
982 	}
983 	status = nfs_ok;
984 out:
985 	read->rd_rqstp = rqstp;
986 	read->rd_fhp = &cstate->current_fh;
987 	return status;
988 }
989 
990 
991 static void
nfsd4_read_release(union nfsd4_op_u * u)992 nfsd4_read_release(union nfsd4_op_u *u)
993 {
994 	if (u->read.rd_nf)
995 		nfsd_file_put(u->read.rd_nf);
996 	trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
997 			     u->read.rd_offset, u->read.rd_length);
998 }
999 
1000 static __be32
nfsd4_readdir(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1001 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1002 	      union nfsd4_op_u *u)
1003 {
1004 	struct nfsd4_readdir *readdir = &u->readdir;
1005 	u64 cookie = readdir->rd_cookie;
1006 	static const nfs4_verifier zeroverf;
1007 
1008 	/* no need to check permission - this will be done in nfsd_readdir() */
1009 
1010 	if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
1011 		return nfserr_inval;
1012 
1013 	readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
1014 	readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
1015 	readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
1016 
1017 	if ((cookie == 1) || (cookie == 2) ||
1018 	    (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
1019 		return nfserr_bad_cookie;
1020 
1021 	readdir->rd_rqstp = rqstp;
1022 	readdir->rd_fhp = &cstate->current_fh;
1023 	return nfs_ok;
1024 }
1025 
1026 static __be32
nfsd4_readlink(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1027 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1028 	       union nfsd4_op_u *u)
1029 {
1030 	u->readlink.rl_rqstp = rqstp;
1031 	u->readlink.rl_fhp = &cstate->current_fh;
1032 	return nfs_ok;
1033 }
1034 
1035 static __be32
nfsd4_remove(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1036 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1037 	     union nfsd4_op_u *u)
1038 {
1039 	struct nfsd4_remove *remove = &u->remove;
1040 	__be32 status;
1041 
1042 	if (opens_in_grace(SVC_NET(rqstp)))
1043 		return nfserr_grace;
1044 	status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
1045 			     remove->rm_name, remove->rm_namelen);
1046 	if (!status) {
1047 		fh_unlock(&cstate->current_fh);
1048 		set_change_info(&remove->rm_cinfo, &cstate->current_fh);
1049 	}
1050 	return status;
1051 }
1052 
1053 static __be32
nfsd4_rename(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1054 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1055 	     union nfsd4_op_u *u)
1056 {
1057 	struct nfsd4_rename *rename = &u->rename;
1058 	__be32 status;
1059 
1060 	if (opens_in_grace(SVC_NET(rqstp)))
1061 		return nfserr_grace;
1062 	status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
1063 			     rename->rn_snamelen, &cstate->current_fh,
1064 			     rename->rn_tname, rename->rn_tnamelen);
1065 	if (status)
1066 		return status;
1067 	set_change_info(&rename->rn_sinfo, &cstate->current_fh);
1068 	set_change_info(&rename->rn_tinfo, &cstate->save_fh);
1069 	return nfs_ok;
1070 }
1071 
1072 static __be32
nfsd4_secinfo(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1073 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1074 	      union nfsd4_op_u *u)
1075 {
1076 	struct nfsd4_secinfo *secinfo = &u->secinfo;
1077 	struct svc_export *exp;
1078 	struct dentry *dentry;
1079 	__be32 err;
1080 
1081 	err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
1082 	if (err)
1083 		return err;
1084 	err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
1085 				    secinfo->si_name, secinfo->si_namelen,
1086 				    &exp, &dentry);
1087 	if (err)
1088 		return err;
1089 	fh_unlock(&cstate->current_fh);
1090 	if (d_really_is_negative(dentry)) {
1091 		exp_put(exp);
1092 		err = nfserr_noent;
1093 	} else
1094 		secinfo->si_exp = exp;
1095 	dput(dentry);
1096 	if (cstate->minorversion)
1097 		/* See rfc 5661 section 2.6.3.1.1.8 */
1098 		fh_put(&cstate->current_fh);
1099 	return err;
1100 }
1101 
1102 static __be32
nfsd4_secinfo_no_name(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1103 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1104 		union nfsd4_op_u *u)
1105 {
1106 	__be32 err;
1107 
1108 	switch (u->secinfo_no_name.sin_style) {
1109 	case NFS4_SECINFO_STYLE4_CURRENT_FH:
1110 		break;
1111 	case NFS4_SECINFO_STYLE4_PARENT:
1112 		err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
1113 		if (err)
1114 			return err;
1115 		break;
1116 	default:
1117 		return nfserr_inval;
1118 	}
1119 
1120 	u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
1121 	fh_put(&cstate->current_fh);
1122 	return nfs_ok;
1123 }
1124 
1125 static void
nfsd4_secinfo_release(union nfsd4_op_u * u)1126 nfsd4_secinfo_release(union nfsd4_op_u *u)
1127 {
1128 	if (u->secinfo.si_exp)
1129 		exp_put(u->secinfo.si_exp);
1130 }
1131 
1132 static void
nfsd4_secinfo_no_name_release(union nfsd4_op_u * u)1133 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
1134 {
1135 	if (u->secinfo_no_name.sin_exp)
1136 		exp_put(u->secinfo_no_name.sin_exp);
1137 }
1138 
1139 static __be32
nfsd4_setattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1140 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1141 	      union nfsd4_op_u *u)
1142 {
1143 	struct nfsd4_setattr *setattr = &u->setattr;
1144 	__be32 status = nfs_ok;
1145 	int err;
1146 
1147 	if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
1148 		status = nfs4_preprocess_stateid_op(rqstp, cstate,
1149 				&cstate->current_fh, &setattr->sa_stateid,
1150 				WR_STATE, NULL, NULL);
1151 		if (status) {
1152 			dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
1153 			return status;
1154 		}
1155 	}
1156 	err = fh_want_write(&cstate->current_fh);
1157 	if (err)
1158 		return nfserrno(err);
1159 	status = nfs_ok;
1160 
1161 	status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
1162 				    nfsd_attrmask);
1163 	if (status)
1164 		goto out;
1165 
1166 	if (setattr->sa_acl != NULL)
1167 		status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
1168 					    setattr->sa_acl);
1169 	if (status)
1170 		goto out;
1171 	if (setattr->sa_label.len)
1172 		status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
1173 				&setattr->sa_label);
1174 	if (status)
1175 		goto out;
1176 	status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
1177 				0, (time64_t)0);
1178 out:
1179 	fh_drop_write(&cstate->current_fh);
1180 	return status;
1181 }
1182 
1183 static __be32
nfsd4_write(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1184 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1185 	    union nfsd4_op_u *u)
1186 {
1187 	struct nfsd4_write *write = &u->write;
1188 	stateid_t *stateid = &write->wr_stateid;
1189 	struct nfsd_file *nf = NULL;
1190 	__be32 status = nfs_ok;
1191 	unsigned long cnt;
1192 	int nvecs;
1193 
1194 	if (write->wr_offset > (u64)OFFSET_MAX ||
1195 	    write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX)
1196 		return nfserr_fbig;
1197 
1198 	cnt = write->wr_buflen;
1199 	trace_nfsd_write_start(rqstp, &cstate->current_fh,
1200 			       write->wr_offset, cnt);
1201 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1202 						stateid, WR_STATE, &nf, NULL);
1203 	if (status) {
1204 		dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1205 		return status;
1206 	}
1207 
1208 	write->wr_how_written = write->wr_stable_how;
1209 
1210 	nvecs = svc_fill_write_vector(rqstp, &write->wr_payload);
1211 	WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1212 
1213 	status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
1214 				write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1215 				write->wr_how_written,
1216 				(__be32 *)write->wr_verifier.data);
1217 	nfsd_file_put(nf);
1218 
1219 	write->wr_bytes_written = cnt;
1220 	trace_nfsd_write_done(rqstp, &cstate->current_fh,
1221 			      write->wr_offset, cnt);
1222 	return status;
1223 }
1224 
1225 static __be32
nfsd4_verify_copy(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,stateid_t * src_stateid,struct nfsd_file ** src,stateid_t * dst_stateid,struct nfsd_file ** dst)1226 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1227 		  stateid_t *src_stateid, struct nfsd_file **src,
1228 		  stateid_t *dst_stateid, struct nfsd_file **dst)
1229 {
1230 	__be32 status;
1231 
1232 	if (!cstate->save_fh.fh_dentry)
1233 		return nfserr_nofilehandle;
1234 
1235 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1236 					    src_stateid, RD_STATE, src, NULL);
1237 	if (status) {
1238 		dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1239 		goto out;
1240 	}
1241 
1242 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1243 					    dst_stateid, WR_STATE, dst, NULL);
1244 	if (status) {
1245 		dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1246 		goto out_put_src;
1247 	}
1248 
1249 	/* fix up for NFS-specific error code */
1250 	if (!S_ISREG(file_inode((*src)->nf_file)->i_mode) ||
1251 	    !S_ISREG(file_inode((*dst)->nf_file)->i_mode)) {
1252 		status = nfserr_wrong_type;
1253 		goto out_put_dst;
1254 	}
1255 
1256 out:
1257 	return status;
1258 out_put_dst:
1259 	nfsd_file_put(*dst);
1260 out_put_src:
1261 	nfsd_file_put(*src);
1262 	goto out;
1263 }
1264 
1265 static __be32
nfsd4_clone(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1266 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1267 		union nfsd4_op_u *u)
1268 {
1269 	struct nfsd4_clone *clone = &u->clone;
1270 	struct nfsd_file *src, *dst;
1271 	__be32 status;
1272 
1273 	status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1274 				   &clone->cl_dst_stateid, &dst);
1275 	if (status)
1276 		goto out;
1277 
1278 	status = nfsd4_clone_file_range(rqstp, src, clone->cl_src_pos,
1279 			dst, clone->cl_dst_pos, clone->cl_count,
1280 			EX_ISSYNC(cstate->current_fh.fh_export));
1281 
1282 	nfsd_file_put(dst);
1283 	nfsd_file_put(src);
1284 out:
1285 	return status;
1286 }
1287 
nfs4_put_copy(struct nfsd4_copy * copy)1288 void nfs4_put_copy(struct nfsd4_copy *copy)
1289 {
1290 	if (!refcount_dec_and_test(&copy->refcount))
1291 		return;
1292 	kfree(copy);
1293 }
1294 
1295 static bool
check_and_set_stop_copy(struct nfsd4_copy * copy)1296 check_and_set_stop_copy(struct nfsd4_copy *copy)
1297 {
1298 	bool value;
1299 
1300 	spin_lock(&copy->cp_clp->async_lock);
1301 	value = copy->stopped;
1302 	if (!copy->stopped)
1303 		copy->stopped = true;
1304 	spin_unlock(&copy->cp_clp->async_lock);
1305 	return value;
1306 }
1307 
nfsd4_stop_copy(struct nfsd4_copy * copy)1308 static void nfsd4_stop_copy(struct nfsd4_copy *copy)
1309 {
1310 	/* only 1 thread should stop the copy */
1311 	if (!check_and_set_stop_copy(copy))
1312 		kthread_stop(copy->copy_task);
1313 	nfs4_put_copy(copy);
1314 }
1315 
nfsd4_get_copy(struct nfs4_client * clp)1316 static struct nfsd4_copy *nfsd4_get_copy(struct nfs4_client *clp)
1317 {
1318 	struct nfsd4_copy *copy = NULL;
1319 
1320 	spin_lock(&clp->async_lock);
1321 	if (!list_empty(&clp->async_copies)) {
1322 		copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
1323 					copies);
1324 		refcount_inc(&copy->refcount);
1325 	}
1326 	spin_unlock(&clp->async_lock);
1327 	return copy;
1328 }
1329 
nfsd4_shutdown_copy(struct nfs4_client * clp)1330 void nfsd4_shutdown_copy(struct nfs4_client *clp)
1331 {
1332 	struct nfsd4_copy *copy;
1333 
1334 	while ((copy = nfsd4_get_copy(clp)) != NULL)
1335 		nfsd4_stop_copy(copy);
1336 }
1337 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
1338 
1339 extern struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1340 				   struct nfs_fh *src_fh,
1341 				   nfs4_stateid *stateid);
1342 extern void nfs42_ssc_close(struct file *filep);
1343 
1344 extern void nfs_sb_deactive(struct super_block *sb);
1345 
1346 #define NFSD42_INTERSSC_MOUNTOPS "vers=4.2,addr=%s,sec=sys"
1347 
1348 /*
1349  * setup a work entry in the ssc delayed unmount list.
1350  */
nfsd4_ssc_setup_dul(struct nfsd_net * nn,char * ipaddr,struct nfsd4_ssc_umount_item ** retwork,struct vfsmount ** ss_mnt)1351 static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
1352 		struct nfsd4_ssc_umount_item **retwork, struct vfsmount **ss_mnt)
1353 {
1354 	struct nfsd4_ssc_umount_item *ni = NULL;
1355 	struct nfsd4_ssc_umount_item *work = NULL;
1356 	struct nfsd4_ssc_umount_item *tmp;
1357 	DEFINE_WAIT(wait);
1358 
1359 	*ss_mnt = NULL;
1360 	*retwork = NULL;
1361 	work = kzalloc(sizeof(*work), GFP_KERNEL);
1362 try_again:
1363 	spin_lock(&nn->nfsd_ssc_lock);
1364 	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1365 		if (strncmp(ni->nsui_ipaddr, ipaddr, sizeof(ni->nsui_ipaddr)))
1366 			continue;
1367 		/* found a match */
1368 		if (ni->nsui_busy) {
1369 			/*  wait - and try again */
1370 			prepare_to_wait(&nn->nfsd_ssc_waitq, &wait,
1371 				TASK_INTERRUPTIBLE);
1372 			spin_unlock(&nn->nfsd_ssc_lock);
1373 
1374 			/* allow 20secs for mount/unmount for now - revisit */
1375 			if (signal_pending(current) ||
1376 					(schedule_timeout(20*HZ) == 0)) {
1377 				kfree(work);
1378 				return nfserr_eagain;
1379 			}
1380 			finish_wait(&nn->nfsd_ssc_waitq, &wait);
1381 			goto try_again;
1382 		}
1383 		*ss_mnt = ni->nsui_vfsmount;
1384 		refcount_inc(&ni->nsui_refcnt);
1385 		spin_unlock(&nn->nfsd_ssc_lock);
1386 		kfree(work);
1387 
1388 		/* return vfsmount in ss_mnt */
1389 		return 0;
1390 	}
1391 	if (work) {
1392 		strncpy(work->nsui_ipaddr, ipaddr, sizeof(work->nsui_ipaddr));
1393 		refcount_set(&work->nsui_refcnt, 2);
1394 		work->nsui_busy = true;
1395 		list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list);
1396 		*retwork = work;
1397 	}
1398 	spin_unlock(&nn->nfsd_ssc_lock);
1399 	return 0;
1400 }
1401 
nfsd4_ssc_update_dul_work(struct nfsd_net * nn,struct nfsd4_ssc_umount_item * work,struct vfsmount * ss_mnt)1402 static void nfsd4_ssc_update_dul_work(struct nfsd_net *nn,
1403 		struct nfsd4_ssc_umount_item *work, struct vfsmount *ss_mnt)
1404 {
1405 	/* set nsui_vfsmount, clear busy flag and wakeup waiters */
1406 	spin_lock(&nn->nfsd_ssc_lock);
1407 	work->nsui_vfsmount = ss_mnt;
1408 	work->nsui_busy = false;
1409 	wake_up_all(&nn->nfsd_ssc_waitq);
1410 	spin_unlock(&nn->nfsd_ssc_lock);
1411 }
1412 
nfsd4_ssc_cancel_dul_work(struct nfsd_net * nn,struct nfsd4_ssc_umount_item * work)1413 static void nfsd4_ssc_cancel_dul_work(struct nfsd_net *nn,
1414 		struct nfsd4_ssc_umount_item *work)
1415 {
1416 	spin_lock(&nn->nfsd_ssc_lock);
1417 	list_del(&work->nsui_list);
1418 	wake_up_all(&nn->nfsd_ssc_waitq);
1419 	spin_unlock(&nn->nfsd_ssc_lock);
1420 	kfree(work);
1421 }
1422 
1423 /*
1424  * Support one copy source server for now.
1425  */
1426 static __be32
nfsd4_interssc_connect(struct nl4_server * nss,struct svc_rqst * rqstp,struct vfsmount ** mount)1427 nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
1428 		       struct vfsmount **mount)
1429 {
1430 	struct file_system_type *type;
1431 	struct vfsmount *ss_mnt;
1432 	struct nfs42_netaddr *naddr;
1433 	struct sockaddr_storage tmp_addr;
1434 	size_t tmp_addrlen, match_netid_len = 3;
1435 	char *startsep = "", *endsep = "", *match_netid = "tcp";
1436 	char *ipaddr, *dev_name, *raw_data;
1437 	int len, raw_len;
1438 	__be32 status = nfserr_inval;
1439 	struct nfsd4_ssc_umount_item *work = NULL;
1440 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1441 
1442 	naddr = &nss->u.nl4_addr;
1443 	tmp_addrlen = rpc_uaddr2sockaddr(SVC_NET(rqstp), naddr->addr,
1444 					 naddr->addr_len,
1445 					 (struct sockaddr *)&tmp_addr,
1446 					 sizeof(tmp_addr));
1447 	if (tmp_addrlen == 0)
1448 		goto out_err;
1449 
1450 	if (tmp_addr.ss_family == AF_INET6) {
1451 		startsep = "[";
1452 		endsep = "]";
1453 		match_netid = "tcp6";
1454 		match_netid_len = 4;
1455 	}
1456 
1457 	if (naddr->netid_len != match_netid_len ||
1458 		strncmp(naddr->netid, match_netid, naddr->netid_len))
1459 		goto out_err;
1460 
1461 	/* Construct the raw data for the vfs_kern_mount call */
1462 	len = RPC_MAX_ADDRBUFLEN + 1;
1463 	ipaddr = kzalloc(len, GFP_KERNEL);
1464 	if (!ipaddr)
1465 		goto out_err;
1466 
1467 	rpc_ntop((struct sockaddr *)&tmp_addr, ipaddr, len);
1468 
1469 	/* 2 for ipv6 endsep and startsep. 3 for ":/" and trailing '/0'*/
1470 
1471 	raw_len = strlen(NFSD42_INTERSSC_MOUNTOPS) + strlen(ipaddr);
1472 	raw_data = kzalloc(raw_len, GFP_KERNEL);
1473 	if (!raw_data)
1474 		goto out_free_ipaddr;
1475 
1476 	snprintf(raw_data, raw_len, NFSD42_INTERSSC_MOUNTOPS, ipaddr);
1477 
1478 	status = nfserr_nodev;
1479 	type = get_fs_type("nfs");
1480 	if (!type)
1481 		goto out_free_rawdata;
1482 
1483 	/* Set the server:<export> for the vfs_kern_mount call */
1484 	dev_name = kzalloc(len + 5, GFP_KERNEL);
1485 	if (!dev_name)
1486 		goto out_free_rawdata;
1487 	snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
1488 
1489 	status = nfsd4_ssc_setup_dul(nn, ipaddr, &work, &ss_mnt);
1490 	if (status)
1491 		goto out_free_devname;
1492 	if (ss_mnt)
1493 		goto out_done;
1494 
1495 	/* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
1496 	ss_mnt = vfs_kern_mount(type, SB_KERNMOUNT, dev_name, raw_data);
1497 	module_put(type->owner);
1498 	if (IS_ERR(ss_mnt)) {
1499 		status = nfserr_nodev;
1500 		if (work)
1501 			nfsd4_ssc_cancel_dul_work(nn, work);
1502 		goto out_free_devname;
1503 	}
1504 	if (work)
1505 		nfsd4_ssc_update_dul_work(nn, work, ss_mnt);
1506 out_done:
1507 	status = 0;
1508 	*mount = ss_mnt;
1509 
1510 out_free_devname:
1511 	kfree(dev_name);
1512 out_free_rawdata:
1513 	kfree(raw_data);
1514 out_free_ipaddr:
1515 	kfree(ipaddr);
1516 out_err:
1517 	return status;
1518 }
1519 
1520 static void
nfsd4_interssc_disconnect(struct vfsmount * ss_mnt)1521 nfsd4_interssc_disconnect(struct vfsmount *ss_mnt)
1522 {
1523 	nfs_do_sb_deactive(ss_mnt->mnt_sb);
1524 	mntput(ss_mnt);
1525 }
1526 
1527 /*
1528  * Verify COPY destination stateid.
1529  *
1530  * Connect to the source server with NFSv4.1.
1531  * Create the source struct file for nfsd_copy_range.
1532  * Called with COPY cstate:
1533  *    SAVED_FH: source filehandle
1534  *    CURRENT_FH: destination filehandle
1535  */
1536 static __be32
nfsd4_setup_inter_ssc(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_copy * copy,struct vfsmount ** mount)1537 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1538 		      struct nfsd4_compound_state *cstate,
1539 		      struct nfsd4_copy *copy, struct vfsmount **mount)
1540 {
1541 	struct svc_fh *s_fh = NULL;
1542 	stateid_t *s_stid = &copy->cp_src_stateid;
1543 	__be32 status = nfserr_inval;
1544 
1545 	/* Verify the destination stateid and set dst struct file*/
1546 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1547 					    &copy->cp_dst_stateid,
1548 					    WR_STATE, &copy->nf_dst, NULL);
1549 	if (status)
1550 		goto out;
1551 
1552 	status = nfsd4_interssc_connect(&copy->cp_src, rqstp, mount);
1553 	if (status)
1554 		goto out;
1555 
1556 	s_fh = &cstate->save_fh;
1557 
1558 	copy->c_fh.size = s_fh->fh_handle.fh_size;
1559 	memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_raw, copy->c_fh.size);
1560 	copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
1561 	memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
1562 	       sizeof(stateid_opaque_t));
1563 
1564 	status = 0;
1565 out:
1566 	return status;
1567 }
1568 
1569 static void
nfsd4_cleanup_inter_ssc(struct vfsmount * ss_mnt,struct nfsd_file * src,struct nfsd_file * dst)1570 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct nfsd_file *src,
1571 			struct nfsd_file *dst)
1572 {
1573 	bool found = false;
1574 	long timeout;
1575 	struct nfsd4_ssc_umount_item *tmp;
1576 	struct nfsd4_ssc_umount_item *ni = NULL;
1577 	struct nfsd_net *nn = net_generic(dst->nf_net, nfsd_net_id);
1578 
1579 	nfs42_ssc_close(src->nf_file);
1580 	nfsd_file_put(dst);
1581 	fput(src->nf_file);
1582 
1583 	if (!nn) {
1584 		mntput(ss_mnt);
1585 		return;
1586 	}
1587 	spin_lock(&nn->nfsd_ssc_lock);
1588 	timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
1589 	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1590 		if (ni->nsui_vfsmount->mnt_sb == ss_mnt->mnt_sb) {
1591 			list_del(&ni->nsui_list);
1592 			/*
1593 			 * vfsmount can be shared by multiple exports,
1594 			 * decrement refcnt. If the count drops to 1 it
1595 			 * will be unmounted when nsui_expire expires.
1596 			 */
1597 			refcount_dec(&ni->nsui_refcnt);
1598 			ni->nsui_expire = jiffies + timeout;
1599 			list_add_tail(&ni->nsui_list, &nn->nfsd_ssc_mount_list);
1600 			found = true;
1601 			break;
1602 		}
1603 	}
1604 	spin_unlock(&nn->nfsd_ssc_lock);
1605 	if (!found) {
1606 		mntput(ss_mnt);
1607 		return;
1608 	}
1609 }
1610 
1611 #else /* CONFIG_NFSD_V4_2_INTER_SSC */
1612 
1613 static __be32
nfsd4_setup_inter_ssc(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_copy * copy,struct vfsmount ** mount)1614 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1615 		      struct nfsd4_compound_state *cstate,
1616 		      struct nfsd4_copy *copy,
1617 		      struct vfsmount **mount)
1618 {
1619 	*mount = NULL;
1620 	return nfserr_inval;
1621 }
1622 
1623 static void
nfsd4_cleanup_inter_ssc(struct vfsmount * ss_mnt,struct nfsd_file * src,struct nfsd_file * dst)1624 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct nfsd_file *src,
1625 			struct nfsd_file *dst)
1626 {
1627 }
1628 
1629 static void
nfsd4_interssc_disconnect(struct vfsmount * ss_mnt)1630 nfsd4_interssc_disconnect(struct vfsmount *ss_mnt)
1631 {
1632 }
1633 
nfs42_ssc_open(struct vfsmount * ss_mnt,struct nfs_fh * src_fh,nfs4_stateid * stateid)1634 static struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1635 				   struct nfs_fh *src_fh,
1636 				   nfs4_stateid *stateid)
1637 {
1638 	return NULL;
1639 }
1640 #endif /* CONFIG_NFSD_V4_2_INTER_SSC */
1641 
1642 static __be32
nfsd4_setup_intra_ssc(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_copy * copy)1643 nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
1644 		      struct nfsd4_compound_state *cstate,
1645 		      struct nfsd4_copy *copy)
1646 {
1647 	return nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid,
1648 				 &copy->nf_src, &copy->cp_dst_stateid,
1649 				 &copy->nf_dst);
1650 }
1651 
1652 static void
nfsd4_cleanup_intra_ssc(struct nfsd_file * src,struct nfsd_file * dst)1653 nfsd4_cleanup_intra_ssc(struct nfsd_file *src, struct nfsd_file *dst)
1654 {
1655 	nfsd_file_put(src);
1656 	nfsd_file_put(dst);
1657 }
1658 
nfsd4_cb_offload_release(struct nfsd4_callback * cb)1659 static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1660 {
1661 	struct nfsd4_copy *copy = container_of(cb, struct nfsd4_copy, cp_cb);
1662 
1663 	nfs4_put_copy(copy);
1664 }
1665 
nfsd4_cb_offload_done(struct nfsd4_callback * cb,struct rpc_task * task)1666 static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1667 				 struct rpc_task *task)
1668 {
1669 	return 1;
1670 }
1671 
1672 static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1673 	.release = nfsd4_cb_offload_release,
1674 	.done = nfsd4_cb_offload_done
1675 };
1676 
nfsd4_init_copy_res(struct nfsd4_copy * copy,bool sync)1677 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1678 {
1679 	copy->cp_res.wr_stable_how =
1680 		copy->committed ? NFS_FILE_SYNC : NFS_UNSTABLE;
1681 	copy->cp_synchronous = sync;
1682 	gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
1683 }
1684 
_nfsd_copy_file_range(struct nfsd4_copy * copy)1685 static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy)
1686 {
1687 	struct file *dst = copy->nf_dst->nf_file;
1688 	struct file *src = copy->nf_src->nf_file;
1689 	errseq_t since;
1690 	ssize_t bytes_copied = 0;
1691 	u64 bytes_total = copy->cp_count;
1692 	u64 src_pos = copy->cp_src_pos;
1693 	u64 dst_pos = copy->cp_dst_pos;
1694 	int status;
1695 
1696 	/* See RFC 7862 p.67: */
1697 	if (bytes_total == 0)
1698 		bytes_total = ULLONG_MAX;
1699 	do {
1700 		if (kthread_should_stop())
1701 			break;
1702 		bytes_copied = nfsd_copy_file_range(src, src_pos, dst, dst_pos,
1703 						    bytes_total);
1704 		if (bytes_copied <= 0)
1705 			break;
1706 		bytes_total -= bytes_copied;
1707 		copy->cp_res.wr_bytes_written += bytes_copied;
1708 		src_pos += bytes_copied;
1709 		dst_pos += bytes_copied;
1710 	} while (bytes_total > 0 && !copy->cp_synchronous);
1711 	/* for a non-zero asynchronous copy do a commit of data */
1712 	if (!copy->cp_synchronous && copy->cp_res.wr_bytes_written > 0) {
1713 		since = READ_ONCE(dst->f_wb_err);
1714 		status = vfs_fsync_range(dst, copy->cp_dst_pos,
1715 					 copy->cp_res.wr_bytes_written, 0);
1716 		if (!status)
1717 			status = filemap_check_wb_err(dst->f_mapping, since);
1718 		if (!status)
1719 			copy->committed = true;
1720 	}
1721 	return bytes_copied;
1722 }
1723 
nfsd4_do_copy(struct nfsd4_copy * copy,bool sync)1724 static __be32 nfsd4_do_copy(struct nfsd4_copy *copy, bool sync)
1725 {
1726 	__be32 status;
1727 	ssize_t bytes;
1728 
1729 	bytes = _nfsd_copy_file_range(copy);
1730 	/* for async copy, we ignore the error, client can always retry
1731 	 * to get the error
1732 	 */
1733 	if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1734 		status = nfserrno(bytes);
1735 	else {
1736 		nfsd4_init_copy_res(copy, sync);
1737 		status = nfs_ok;
1738 	}
1739 
1740 	if (!copy->cp_intra) /* Inter server SSC */
1741 		nfsd4_cleanup_inter_ssc(copy->ss_mnt, copy->nf_src,
1742 					copy->nf_dst);
1743 	else
1744 		nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
1745 
1746 	return status;
1747 }
1748 
dup_copy_fields(struct nfsd4_copy * src,struct nfsd4_copy * dst)1749 static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1750 {
1751 	dst->cp_src_pos = src->cp_src_pos;
1752 	dst->cp_dst_pos = src->cp_dst_pos;
1753 	dst->cp_count = src->cp_count;
1754 	dst->cp_synchronous = src->cp_synchronous;
1755 	memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1756 	memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1757 	dst->cp_clp = src->cp_clp;
1758 	dst->nf_dst = nfsd_file_get(src->nf_dst);
1759 	dst->cp_intra = src->cp_intra;
1760 	if (src->cp_intra) /* for inter, file_src doesn't exist yet */
1761 		dst->nf_src = nfsd_file_get(src->nf_src);
1762 
1763 	memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1764 	memcpy(&dst->cp_src, &src->cp_src, sizeof(struct nl4_server));
1765 	memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
1766 	memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
1767 	dst->ss_mnt = src->ss_mnt;
1768 }
1769 
cleanup_async_copy(struct nfsd4_copy * copy)1770 static void cleanup_async_copy(struct nfsd4_copy *copy)
1771 {
1772 	nfs4_free_copy_state(copy);
1773 	nfsd_file_put(copy->nf_dst);
1774 	if (copy->cp_intra)
1775 		nfsd_file_put(copy->nf_src);
1776 	spin_lock(&copy->cp_clp->async_lock);
1777 	list_del(&copy->copies);
1778 	spin_unlock(&copy->cp_clp->async_lock);
1779 	nfs4_put_copy(copy);
1780 }
1781 
nfsd4_do_async_copy(void * data)1782 static int nfsd4_do_async_copy(void *data)
1783 {
1784 	struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1785 	struct nfsd4_copy *cb_copy;
1786 
1787 	if (!copy->cp_intra) { /* Inter server SSC */
1788 		copy->nf_src = kzalloc(sizeof(struct nfsd_file), GFP_KERNEL);
1789 		if (!copy->nf_src) {
1790 			copy->nfserr = nfserr_serverfault;
1791 			nfsd4_interssc_disconnect(copy->ss_mnt);
1792 			goto do_callback;
1793 		}
1794 		copy->nf_src->nf_file = nfs42_ssc_open(copy->ss_mnt, &copy->c_fh,
1795 					      &copy->stateid);
1796 		if (IS_ERR(copy->nf_src->nf_file)) {
1797 			copy->nfserr = nfserr_offload_denied;
1798 			nfsd4_interssc_disconnect(copy->ss_mnt);
1799 			goto do_callback;
1800 		}
1801 	}
1802 
1803 	copy->nfserr = nfsd4_do_copy(copy, 0);
1804 do_callback:
1805 	cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1806 	if (!cb_copy)
1807 		goto out;
1808 	refcount_set(&cb_copy->refcount, 1);
1809 	memcpy(&cb_copy->cp_res, &copy->cp_res, sizeof(copy->cp_res));
1810 	cb_copy->cp_clp = copy->cp_clp;
1811 	cb_copy->nfserr = copy->nfserr;
1812 	memcpy(&cb_copy->fh, &copy->fh, sizeof(copy->fh));
1813 	nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp,
1814 			&nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD);
1815 	trace_nfsd_cb_offload(copy->cp_clp, &copy->cp_res.cb_stateid,
1816 			      &copy->fh, copy->cp_count, copy->nfserr);
1817 	nfsd4_run_cb(&cb_copy->cp_cb);
1818 out:
1819 	if (!copy->cp_intra)
1820 		kfree(copy->nf_src);
1821 	cleanup_async_copy(copy);
1822 	return 0;
1823 }
1824 
1825 static __be32
nfsd4_copy(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1826 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1827 		union nfsd4_op_u *u)
1828 {
1829 	struct nfsd4_copy *copy = &u->copy;
1830 	__be32 status;
1831 	struct nfsd4_copy *async_copy = NULL;
1832 
1833 	if (!copy->cp_intra) { /* Inter server SSC */
1834 		if (!inter_copy_offload_enable || copy->cp_synchronous) {
1835 			status = nfserr_notsupp;
1836 			goto out;
1837 		}
1838 		status = nfsd4_setup_inter_ssc(rqstp, cstate, copy,
1839 				&copy->ss_mnt);
1840 		if (status)
1841 			return nfserr_offload_denied;
1842 	} else {
1843 		status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
1844 		if (status)
1845 			return status;
1846 	}
1847 
1848 	copy->cp_clp = cstate->clp;
1849 	memcpy(&copy->fh, &cstate->current_fh.fh_handle,
1850 		sizeof(struct knfsd_fh));
1851 	if (!copy->cp_synchronous) {
1852 		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1853 
1854 		status = nfserrno(-ENOMEM);
1855 		async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1856 		if (!async_copy)
1857 			goto out_err;
1858 		if (!nfs4_init_copy_state(nn, copy))
1859 			goto out_err;
1860 		refcount_set(&async_copy->refcount, 1);
1861 		memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid.stid,
1862 			sizeof(copy->cp_res.cb_stateid));
1863 		dup_copy_fields(copy, async_copy);
1864 		async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1865 				async_copy, "%s", "copy thread");
1866 		if (IS_ERR(async_copy->copy_task))
1867 			goto out_err;
1868 		spin_lock(&async_copy->cp_clp->async_lock);
1869 		list_add(&async_copy->copies,
1870 				&async_copy->cp_clp->async_copies);
1871 		spin_unlock(&async_copy->cp_clp->async_lock);
1872 		wake_up_process(async_copy->copy_task);
1873 		status = nfs_ok;
1874 	} else {
1875 		status = nfsd4_do_copy(copy, 1);
1876 	}
1877 out:
1878 	return status;
1879 out_err:
1880 	if (async_copy)
1881 		cleanup_async_copy(async_copy);
1882 	status = nfserrno(-ENOMEM);
1883 	if (!copy->cp_intra)
1884 		nfsd4_interssc_disconnect(copy->ss_mnt);
1885 	goto out;
1886 }
1887 
1888 struct nfsd4_copy *
find_async_copy(struct nfs4_client * clp,stateid_t * stateid)1889 find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1890 {
1891 	struct nfsd4_copy *copy;
1892 
1893 	spin_lock(&clp->async_lock);
1894 	list_for_each_entry(copy, &clp->async_copies, copies) {
1895 		if (memcmp(&copy->cp_stateid.stid, stateid, NFS4_STATEID_SIZE))
1896 			continue;
1897 		refcount_inc(&copy->refcount);
1898 		spin_unlock(&clp->async_lock);
1899 		return copy;
1900 	}
1901 	spin_unlock(&clp->async_lock);
1902 	return NULL;
1903 }
1904 
1905 static __be32
nfsd4_offload_cancel(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1906 nfsd4_offload_cancel(struct svc_rqst *rqstp,
1907 		     struct nfsd4_compound_state *cstate,
1908 		     union nfsd4_op_u *u)
1909 {
1910 	struct nfsd4_offload_status *os = &u->offload_status;
1911 	struct nfsd4_copy *copy;
1912 	struct nfs4_client *clp = cstate->clp;
1913 
1914 	copy = find_async_copy(clp, &os->stateid);
1915 	if (!copy) {
1916 		struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1917 
1918 		return manage_cpntf_state(nn, &os->stateid, clp, NULL);
1919 	} else
1920 		nfsd4_stop_copy(copy);
1921 
1922 	return nfs_ok;
1923 }
1924 
1925 static __be32
nfsd4_copy_notify(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1926 nfsd4_copy_notify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1927 		  union nfsd4_op_u *u)
1928 {
1929 	struct nfsd4_copy_notify *cn = &u->copy_notify;
1930 	__be32 status;
1931 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1932 	struct nfs4_stid *stid;
1933 	struct nfs4_cpntf_state *cps;
1934 	struct nfs4_client *clp = cstate->clp;
1935 
1936 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1937 					&cn->cpn_src_stateid, RD_STATE, NULL,
1938 					&stid);
1939 	if (status)
1940 		return status;
1941 
1942 	cn->cpn_sec = nn->nfsd4_lease;
1943 	cn->cpn_nsec = 0;
1944 
1945 	status = nfserrno(-ENOMEM);
1946 	cps = nfs4_alloc_init_cpntf_state(nn, stid);
1947 	if (!cps)
1948 		goto out;
1949 	memcpy(&cn->cpn_cnr_stateid, &cps->cp_stateid.stid, sizeof(stateid_t));
1950 	memcpy(&cps->cp_p_stateid, &stid->sc_stateid, sizeof(stateid_t));
1951 	memcpy(&cps->cp_p_clid, &clp->cl_clientid, sizeof(clientid_t));
1952 
1953 	/* For now, only return one server address in cpn_src, the
1954 	 * address used by the client to connect to this server.
1955 	 */
1956 	cn->cpn_src.nl4_type = NL4_NETADDR;
1957 	status = nfsd4_set_netaddr((struct sockaddr *)&rqstp->rq_daddr,
1958 				 &cn->cpn_src.u.nl4_addr);
1959 	WARN_ON_ONCE(status);
1960 	if (status) {
1961 		nfs4_put_cpntf_state(nn, cps);
1962 		goto out;
1963 	}
1964 out:
1965 	nfs4_put_stid(stid);
1966 	return status;
1967 }
1968 
1969 static __be32
nfsd4_fallocate(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_fallocate * fallocate,int flags)1970 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1971 		struct nfsd4_fallocate *fallocate, int flags)
1972 {
1973 	__be32 status;
1974 	struct nfsd_file *nf;
1975 
1976 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1977 					    &fallocate->falloc_stateid,
1978 					    WR_STATE, &nf, NULL);
1979 	if (status != nfs_ok) {
1980 		dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1981 		return status;
1982 	}
1983 
1984 	status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, nf->nf_file,
1985 				     fallocate->falloc_offset,
1986 				     fallocate->falloc_length,
1987 				     flags);
1988 	nfsd_file_put(nf);
1989 	return status;
1990 }
1991 static __be32
nfsd4_offload_status(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)1992 nfsd4_offload_status(struct svc_rqst *rqstp,
1993 		     struct nfsd4_compound_state *cstate,
1994 		     union nfsd4_op_u *u)
1995 {
1996 	struct nfsd4_offload_status *os = &u->offload_status;
1997 	__be32 status = 0;
1998 	struct nfsd4_copy *copy;
1999 	struct nfs4_client *clp = cstate->clp;
2000 
2001 	copy = find_async_copy(clp, &os->stateid);
2002 	if (copy) {
2003 		os->count = copy->cp_res.wr_bytes_written;
2004 		nfs4_put_copy(copy);
2005 	} else
2006 		status = nfserr_bad_stateid;
2007 
2008 	return status;
2009 }
2010 
2011 static __be32
nfsd4_allocate(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2012 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2013 	       union nfsd4_op_u *u)
2014 {
2015 	return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
2016 }
2017 
2018 static __be32
nfsd4_deallocate(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2019 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2020 		 union nfsd4_op_u *u)
2021 {
2022 	return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
2023 			       FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
2024 }
2025 
2026 static __be32
nfsd4_seek(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2027 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2028 	   union nfsd4_op_u *u)
2029 {
2030 	struct nfsd4_seek *seek = &u->seek;
2031 	int whence;
2032 	__be32 status;
2033 	struct nfsd_file *nf;
2034 
2035 	status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
2036 					    &seek->seek_stateid,
2037 					    RD_STATE, &nf, NULL);
2038 	if (status) {
2039 		dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
2040 		return status;
2041 	}
2042 
2043 	switch (seek->seek_whence) {
2044 	case NFS4_CONTENT_DATA:
2045 		whence = SEEK_DATA;
2046 		break;
2047 	case NFS4_CONTENT_HOLE:
2048 		whence = SEEK_HOLE;
2049 		break;
2050 	default:
2051 		status = nfserr_union_notsupp;
2052 		goto out;
2053 	}
2054 
2055 	/*
2056 	 * Note:  This call does change file->f_pos, but nothing in NFSD
2057 	 *        should ever file->f_pos.
2058 	 */
2059 	seek->seek_pos = vfs_llseek(nf->nf_file, seek->seek_offset, whence);
2060 	if (seek->seek_pos < 0)
2061 		status = nfserrno(seek->seek_pos);
2062 	else if (seek->seek_pos >= i_size_read(file_inode(nf->nf_file)))
2063 		seek->seek_eof = true;
2064 
2065 out:
2066 	nfsd_file_put(nf);
2067 	return status;
2068 }
2069 
2070 /* This routine never returns NFS_OK!  If there are no other errors, it
2071  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
2072  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
2073  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
2074  */
2075 static __be32
_nfsd4_verify(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_verify * verify)2076 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2077 	     struct nfsd4_verify *verify)
2078 {
2079 	__be32 *buf, *p;
2080 	int count;
2081 	__be32 status;
2082 
2083 	status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
2084 	if (status)
2085 		return status;
2086 
2087 	status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
2088 	if (status)
2089 		return status;
2090 
2091 	if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
2092 	    || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
2093 		return nfserr_inval;
2094 	if (verify->ve_attrlen & 3)
2095 		return nfserr_inval;
2096 
2097 	/* count in words:
2098 	 *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
2099 	 */
2100 	count = 4 + (verify->ve_attrlen >> 2);
2101 	buf = kmalloc(count << 2, GFP_KERNEL);
2102 	if (!buf)
2103 		return nfserr_jukebox;
2104 
2105 	p = buf;
2106 	status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
2107 				    cstate->current_fh.fh_export,
2108 				    cstate->current_fh.fh_dentry,
2109 				    verify->ve_bmval,
2110 				    rqstp, 0);
2111 	/*
2112 	 * If nfsd4_encode_fattr() ran out of space, assume that's because
2113 	 * the attributes are longer (hence different) than those given:
2114 	 */
2115 	if (status == nfserr_resource)
2116 		status = nfserr_not_same;
2117 	if (status)
2118 		goto out_kfree;
2119 
2120 	/* skip bitmap */
2121 	p = buf + 1 + ntohl(buf[0]);
2122 	status = nfserr_not_same;
2123 	if (ntohl(*p++) != verify->ve_attrlen)
2124 		goto out_kfree;
2125 	if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
2126 		status = nfserr_same;
2127 
2128 out_kfree:
2129 	kfree(buf);
2130 	return status;
2131 }
2132 
2133 static __be32
nfsd4_nverify(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2134 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2135 	      union nfsd4_op_u *u)
2136 {
2137 	__be32 status;
2138 
2139 	status = _nfsd4_verify(rqstp, cstate, &u->verify);
2140 	return status == nfserr_not_same ? nfs_ok : status;
2141 }
2142 
2143 static __be32
nfsd4_verify(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2144 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2145 	     union nfsd4_op_u *u)
2146 {
2147 	__be32 status;
2148 
2149 	status = _nfsd4_verify(rqstp, cstate, &u->nverify);
2150 	return status == nfserr_same ? nfs_ok : status;
2151 }
2152 
2153 #ifdef CONFIG_NFSD_PNFS
2154 static const struct nfsd4_layout_ops *
nfsd4_layout_verify(struct svc_export * exp,unsigned int layout_type)2155 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
2156 {
2157 	if (!exp->ex_layout_types) {
2158 		dprintk("%s: export does not support pNFS\n", __func__);
2159 		return NULL;
2160 	}
2161 
2162 	if (layout_type >= LAYOUT_TYPE_MAX ||
2163 	    !(exp->ex_layout_types & (1 << layout_type))) {
2164 		dprintk("%s: layout type %d not supported\n",
2165 			__func__, layout_type);
2166 		return NULL;
2167 	}
2168 
2169 	return nfsd4_layout_ops[layout_type];
2170 }
2171 
2172 static __be32
nfsd4_getdeviceinfo(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2173 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
2174 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2175 {
2176 	struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
2177 	const struct nfsd4_layout_ops *ops;
2178 	struct nfsd4_deviceid_map *map;
2179 	struct svc_export *exp;
2180 	__be32 nfserr;
2181 
2182 	dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
2183 	       __func__,
2184 	       gdp->gd_layout_type,
2185 	       gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
2186 	       gdp->gd_maxcount);
2187 
2188 	map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
2189 	if (!map) {
2190 		dprintk("%s: couldn't find device ID to export mapping!\n",
2191 			__func__);
2192 		return nfserr_noent;
2193 	}
2194 
2195 	exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
2196 	if (IS_ERR(exp)) {
2197 		dprintk("%s: could not find device id\n", __func__);
2198 		return nfserr_noent;
2199 	}
2200 
2201 	nfserr = nfserr_layoutunavailable;
2202 	ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
2203 	if (!ops)
2204 		goto out;
2205 
2206 	nfserr = nfs_ok;
2207 	if (gdp->gd_maxcount != 0) {
2208 		nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
2209 				rqstp, cstate->clp, gdp);
2210 	}
2211 
2212 	gdp->gd_notify_types &= ops->notify_types;
2213 out:
2214 	exp_put(exp);
2215 	return nfserr;
2216 }
2217 
2218 static void
nfsd4_getdeviceinfo_release(union nfsd4_op_u * u)2219 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
2220 {
2221 	kfree(u->getdeviceinfo.gd_device);
2222 }
2223 
2224 static __be32
nfsd4_layoutget(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2225 nfsd4_layoutget(struct svc_rqst *rqstp,
2226 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2227 {
2228 	struct nfsd4_layoutget *lgp = &u->layoutget;
2229 	struct svc_fh *current_fh = &cstate->current_fh;
2230 	const struct nfsd4_layout_ops *ops;
2231 	struct nfs4_layout_stateid *ls;
2232 	__be32 nfserr;
2233 	int accmode = NFSD_MAY_READ_IF_EXEC;
2234 
2235 	switch (lgp->lg_seg.iomode) {
2236 	case IOMODE_READ:
2237 		accmode |= NFSD_MAY_READ;
2238 		break;
2239 	case IOMODE_RW:
2240 		accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
2241 		break;
2242 	default:
2243 		dprintk("%s: invalid iomode %d\n",
2244 			__func__, lgp->lg_seg.iomode);
2245 		nfserr = nfserr_badiomode;
2246 		goto out;
2247 	}
2248 
2249 	nfserr = fh_verify(rqstp, current_fh, 0, accmode);
2250 	if (nfserr)
2251 		goto out;
2252 
2253 	nfserr = nfserr_layoutunavailable;
2254 	ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
2255 	if (!ops)
2256 		goto out;
2257 
2258 	/*
2259 	 * Verify minlength and range as per RFC5661:
2260 	 *  o  If loga_length is less than loga_minlength,
2261 	 *     the metadata server MUST return NFS4ERR_INVAL.
2262 	 *  o  If the sum of loga_offset and loga_minlength exceeds
2263 	 *     NFS4_UINT64_MAX, and loga_minlength is not
2264 	 *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
2265 	 *  o  If the sum of loga_offset and loga_length exceeds
2266 	 *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
2267 	 *     the error NFS4ERR_INVAL MUST result.
2268 	 */
2269 	nfserr = nfserr_inval;
2270 	if (lgp->lg_seg.length < lgp->lg_minlength ||
2271 	    (lgp->lg_minlength != NFS4_MAX_UINT64 &&
2272 	     lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
2273 	    (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
2274 	     lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
2275 		goto out;
2276 	if (lgp->lg_seg.length == 0)
2277 		goto out;
2278 
2279 	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
2280 						true, lgp->lg_layout_type, &ls);
2281 	if (nfserr) {
2282 		trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
2283 		goto out;
2284 	}
2285 
2286 	nfserr = nfserr_recallconflict;
2287 	if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
2288 		goto out_put_stid;
2289 
2290 	nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
2291 				     current_fh, lgp);
2292 	if (nfserr)
2293 		goto out_put_stid;
2294 
2295 	nfserr = nfsd4_insert_layout(lgp, ls);
2296 
2297 out_put_stid:
2298 	mutex_unlock(&ls->ls_mutex);
2299 	nfs4_put_stid(&ls->ls_stid);
2300 out:
2301 	return nfserr;
2302 }
2303 
2304 static void
nfsd4_layoutget_release(union nfsd4_op_u * u)2305 nfsd4_layoutget_release(union nfsd4_op_u *u)
2306 {
2307 	kfree(u->layoutget.lg_content);
2308 }
2309 
2310 static __be32
nfsd4_layoutcommit(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2311 nfsd4_layoutcommit(struct svc_rqst *rqstp,
2312 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2313 {
2314 	struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
2315 	const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
2316 	struct svc_fh *current_fh = &cstate->current_fh;
2317 	const struct nfsd4_layout_ops *ops;
2318 	loff_t new_size = lcp->lc_last_wr + 1;
2319 	struct inode *inode;
2320 	struct nfs4_layout_stateid *ls;
2321 	__be32 nfserr;
2322 
2323 	nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
2324 	if (nfserr)
2325 		goto out;
2326 
2327 	nfserr = nfserr_layoutunavailable;
2328 	ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
2329 	if (!ops)
2330 		goto out;
2331 	inode = d_inode(current_fh->fh_dentry);
2332 
2333 	nfserr = nfserr_inval;
2334 	if (new_size <= seg->offset) {
2335 		dprintk("pnfsd: last write before layout segment\n");
2336 		goto out;
2337 	}
2338 	if (new_size > seg->offset + seg->length) {
2339 		dprintk("pnfsd: last write beyond layout segment\n");
2340 		goto out;
2341 	}
2342 	if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
2343 		dprintk("pnfsd: layoutcommit beyond EOF\n");
2344 		goto out;
2345 	}
2346 
2347 	nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
2348 						false, lcp->lc_layout_type,
2349 						&ls);
2350 	if (nfserr) {
2351 		trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
2352 		/* fixup error code as per RFC5661 */
2353 		if (nfserr == nfserr_bad_stateid)
2354 			nfserr = nfserr_badlayout;
2355 		goto out;
2356 	}
2357 
2358 	/* LAYOUTCOMMIT does not require any serialization */
2359 	mutex_unlock(&ls->ls_mutex);
2360 
2361 	if (new_size > i_size_read(inode)) {
2362 		lcp->lc_size_chg = 1;
2363 		lcp->lc_newsize = new_size;
2364 	} else {
2365 		lcp->lc_size_chg = 0;
2366 	}
2367 
2368 	nfserr = ops->proc_layoutcommit(inode, lcp);
2369 	nfs4_put_stid(&ls->ls_stid);
2370 out:
2371 	return nfserr;
2372 }
2373 
2374 static __be32
nfsd4_layoutreturn(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2375 nfsd4_layoutreturn(struct svc_rqst *rqstp,
2376 		struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2377 {
2378 	struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
2379 	struct svc_fh *current_fh = &cstate->current_fh;
2380 	__be32 nfserr;
2381 
2382 	nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
2383 	if (nfserr)
2384 		goto out;
2385 
2386 	nfserr = nfserr_layoutunavailable;
2387 	if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
2388 		goto out;
2389 
2390 	switch (lrp->lr_seg.iomode) {
2391 	case IOMODE_READ:
2392 	case IOMODE_RW:
2393 	case IOMODE_ANY:
2394 		break;
2395 	default:
2396 		dprintk("%s: invalid iomode %d\n", __func__,
2397 			lrp->lr_seg.iomode);
2398 		nfserr = nfserr_inval;
2399 		goto out;
2400 	}
2401 
2402 	switch (lrp->lr_return_type) {
2403 	case RETURN_FILE:
2404 		nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
2405 		break;
2406 	case RETURN_FSID:
2407 	case RETURN_ALL:
2408 		nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
2409 		break;
2410 	default:
2411 		dprintk("%s: invalid return_type %d\n", __func__,
2412 			lrp->lr_return_type);
2413 		nfserr = nfserr_inval;
2414 		break;
2415 	}
2416 out:
2417 	return nfserr;
2418 }
2419 #endif /* CONFIG_NFSD_PNFS */
2420 
2421 static __be32
nfsd4_getxattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2422 nfsd4_getxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2423 	       union nfsd4_op_u *u)
2424 {
2425 	struct nfsd4_getxattr *getxattr = &u->getxattr;
2426 
2427 	return nfsd_getxattr(rqstp, &cstate->current_fh,
2428 			     getxattr->getxa_name, &getxattr->getxa_buf,
2429 			     &getxattr->getxa_len);
2430 }
2431 
2432 static __be32
nfsd4_setxattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2433 nfsd4_setxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2434 	   union nfsd4_op_u *u)
2435 {
2436 	struct nfsd4_setxattr *setxattr = &u->setxattr;
2437 	__be32 ret;
2438 
2439 	if (opens_in_grace(SVC_NET(rqstp)))
2440 		return nfserr_grace;
2441 
2442 	ret = nfsd_setxattr(rqstp, &cstate->current_fh, setxattr->setxa_name,
2443 			    setxattr->setxa_buf, setxattr->setxa_len,
2444 			    setxattr->setxa_flags);
2445 
2446 	if (!ret)
2447 		set_change_info(&setxattr->setxa_cinfo, &cstate->current_fh);
2448 
2449 	return ret;
2450 }
2451 
2452 static __be32
nfsd4_listxattrs(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2453 nfsd4_listxattrs(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2454 	   union nfsd4_op_u *u)
2455 {
2456 	/*
2457 	 * Get the entire list, then copy out only the user attributes
2458 	 * in the encode function.
2459 	 */
2460 	return nfsd_listxattr(rqstp, &cstate->current_fh,
2461 			     &u->listxattrs.lsxa_buf, &u->listxattrs.lsxa_len);
2462 }
2463 
2464 static __be32
nfsd4_removexattr(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)2465 nfsd4_removexattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2466 	   union nfsd4_op_u *u)
2467 {
2468 	struct nfsd4_removexattr *removexattr = &u->removexattr;
2469 	__be32 ret;
2470 
2471 	if (opens_in_grace(SVC_NET(rqstp)))
2472 		return nfserr_grace;
2473 
2474 	ret = nfsd_removexattr(rqstp, &cstate->current_fh,
2475 	    removexattr->rmxa_name);
2476 
2477 	if (!ret)
2478 		set_change_info(&removexattr->rmxa_cinfo, &cstate->current_fh);
2479 
2480 	return ret;
2481 }
2482 
2483 /*
2484  * NULL call.
2485  */
2486 static __be32
nfsd4_proc_null(struct svc_rqst * rqstp)2487 nfsd4_proc_null(struct svc_rqst *rqstp)
2488 {
2489 	return rpc_success;
2490 }
2491 
nfsd4_increment_op_stats(u32 opnum)2492 static inline void nfsd4_increment_op_stats(u32 opnum)
2493 {
2494 	if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
2495 		percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_NFS4_OP(opnum)]);
2496 }
2497 
2498 static const struct nfsd4_operation nfsd4_ops[];
2499 
2500 static const char *nfsd4_op_name(unsigned opnum);
2501 
2502 /*
2503  * Enforce NFSv4.1 COMPOUND ordering rules:
2504  *
2505  * Also note, enforced elsewhere:
2506  *	- SEQUENCE other than as first op results in
2507  *	  NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
2508  *	- BIND_CONN_TO_SESSION must be the only op in its compound.
2509  *	  (Enforced in nfsd4_bind_conn_to_session().)
2510  *	- DESTROY_SESSION must be the final operation in a compound, if
2511  *	  sessionid's in SEQUENCE and DESTROY_SESSION are the same.
2512  *	  (Enforced in nfsd4_destroy_session().)
2513  */
nfs41_check_op_ordering(struct nfsd4_compoundargs * args)2514 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
2515 {
2516 	struct nfsd4_op *first_op = &args->ops[0];
2517 
2518 	/* These ordering requirements don't apply to NFSv4.0: */
2519 	if (args->minorversion == 0)
2520 		return nfs_ok;
2521 	/* This is weird, but OK, not our problem: */
2522 	if (args->opcnt == 0)
2523 		return nfs_ok;
2524 	if (first_op->status == nfserr_op_illegal)
2525 		return nfs_ok;
2526 	if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
2527 		return nfserr_op_not_in_session;
2528 	if (first_op->opnum == OP_SEQUENCE)
2529 		return nfs_ok;
2530 	/*
2531 	 * So first_op is something allowed outside a session, like
2532 	 * EXCHANGE_ID; but then it has to be the only op in the
2533 	 * compound:
2534 	 */
2535 	if (args->opcnt != 1)
2536 		return nfserr_not_only_op;
2537 	return nfs_ok;
2538 }
2539 
OPDESC(struct nfsd4_op * op)2540 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
2541 {
2542 	return &nfsd4_ops[op->opnum];
2543 }
2544 
nfsd4_cache_this_op(struct nfsd4_op * op)2545 bool nfsd4_cache_this_op(struct nfsd4_op *op)
2546 {
2547 	if (op->opnum == OP_ILLEGAL)
2548 		return false;
2549 	return OPDESC(op)->op_flags & OP_CACHEME;
2550 }
2551 
need_wrongsec_check(struct svc_rqst * rqstp)2552 static bool need_wrongsec_check(struct svc_rqst *rqstp)
2553 {
2554 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
2555 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2556 	struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2557 	struct nfsd4_op *next = &argp->ops[resp->opcnt];
2558 	const struct nfsd4_operation *thisd = OPDESC(this);
2559 	const struct nfsd4_operation *nextd;
2560 
2561 	/*
2562 	 * Most ops check wronsec on our own; only the putfh-like ops
2563 	 * have special rules.
2564 	 */
2565 	if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
2566 		return false;
2567 	/*
2568 	 * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
2569 	 * put-filehandle operation if we're not going to use the
2570 	 * result:
2571 	 */
2572 	if (argp->opcnt == resp->opcnt)
2573 		return false;
2574 	if (next->opnum == OP_ILLEGAL)
2575 		return false;
2576 	nextd = OPDESC(next);
2577 	/*
2578 	 * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
2579 	 * errors themselves as necessary; others should check for them
2580 	 * now:
2581 	 */
2582 	return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
2583 }
2584 
2585 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
2586 static void
check_if_stalefh_allowed(struct nfsd4_compoundargs * args)2587 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2588 {
2589 	struct nfsd4_op	*op, *current_op = NULL, *saved_op = NULL;
2590 	struct nfsd4_copy *copy;
2591 	struct nfsd4_putfh *putfh;
2592 	int i;
2593 
2594 	/* traverse all operation and if it's a COPY compound, mark the
2595 	 * source filehandle to skip verification
2596 	 */
2597 	for (i = 0; i < args->opcnt; i++) {
2598 		op = &args->ops[i];
2599 		if (op->opnum == OP_PUTFH)
2600 			current_op = op;
2601 		else if (op->opnum == OP_SAVEFH)
2602 			saved_op = current_op;
2603 		else if (op->opnum == OP_RESTOREFH)
2604 			current_op = saved_op;
2605 		else if (op->opnum == OP_COPY) {
2606 			copy = (struct nfsd4_copy *)&op->u;
2607 			if (!saved_op) {
2608 				op->status = nfserr_nofilehandle;
2609 				return;
2610 			}
2611 			putfh = (struct nfsd4_putfh *)&saved_op->u;
2612 			if (!copy->cp_intra)
2613 				putfh->no_verify = true;
2614 		}
2615 	}
2616 }
2617 #else
2618 static void
check_if_stalefh_allowed(struct nfsd4_compoundargs * args)2619 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2620 {
2621 }
2622 #endif
2623 
2624 /*
2625  * COMPOUND call.
2626  */
2627 static __be32
nfsd4_proc_compound(struct svc_rqst * rqstp)2628 nfsd4_proc_compound(struct svc_rqst *rqstp)
2629 {
2630 	struct nfsd4_compoundargs *args = rqstp->rq_argp;
2631 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
2632 	struct nfsd4_op	*op;
2633 	struct nfsd4_compound_state *cstate = &resp->cstate;
2634 	struct svc_fh *current_fh = &cstate->current_fh;
2635 	struct svc_fh *save_fh = &cstate->save_fh;
2636 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2637 	__be32		status;
2638 
2639 	resp->xdr = &rqstp->rq_res_stream;
2640 	resp->statusp = resp->xdr->p;
2641 
2642 	/* reserve space for: NFS status code */
2643 	xdr_reserve_space(resp->xdr, XDR_UNIT);
2644 
2645 	/* reserve space for: taglen, tag, and opcnt */
2646 	xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
2647 	resp->taglen = args->taglen;
2648 	resp->tag = args->tag;
2649 	resp->rqstp = rqstp;
2650 	cstate->minorversion = args->minorversion;
2651 	fh_init(current_fh, NFS4_FHSIZE);
2652 	fh_init(save_fh, NFS4_FHSIZE);
2653 
2654 	/*
2655 	 * Don't use the deferral mechanism for NFSv4; compounds make it
2656 	 * too hard to avoid non-idempotency problems.
2657 	 */
2658 	__clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2659 
2660 	/*
2661 	 * According to RFC3010, this takes precedence over all other errors.
2662 	 */
2663 	status = nfserr_minor_vers_mismatch;
2664 	if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
2665 		goto out;
2666 	status = nfserr_resource;
2667 	if (args->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
2668 		goto out;
2669 
2670 	status = nfs41_check_op_ordering(args);
2671 	if (status) {
2672 		op = &args->ops[0];
2673 		op->status = status;
2674 		resp->opcnt = 1;
2675 		goto encode_op;
2676 	}
2677 	check_if_stalefh_allowed(args);
2678 
2679 	rqstp->rq_lease_breaker = (void **)&cstate->clp;
2680 
2681 	trace_nfsd_compound(rqstp, args->opcnt);
2682 	while (!status && resp->opcnt < args->opcnt) {
2683 		op = &args->ops[resp->opcnt++];
2684 
2685 		/*
2686 		 * The XDR decode routines may have pre-set op->status;
2687 		 * for example, if there is a miscellaneous XDR error
2688 		 * it will be set to nfserr_bad_xdr.
2689 		 */
2690 		if (op->status) {
2691 			if (op->opnum == OP_OPEN)
2692 				op->status = nfsd4_open_omfg(rqstp, cstate, op);
2693 			goto encode_op;
2694 		}
2695 		if (!current_fh->fh_dentry &&
2696 				!HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
2697 			if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
2698 				op->status = nfserr_nofilehandle;
2699 				goto encode_op;
2700 			}
2701 		} else if (current_fh->fh_export &&
2702 			   current_fh->fh_export->ex_fslocs.migrated &&
2703 			  !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
2704 			op->status = nfserr_moved;
2705 			goto encode_op;
2706 		}
2707 
2708 		fh_clear_pre_post_attrs(current_fh);
2709 
2710 		/* If op is non-idempotent */
2711 		if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
2712 			/*
2713 			 * Don't execute this op if we couldn't encode a
2714 			 * succesful reply:
2715 			 */
2716 			u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2717 			/*
2718 			 * Plus if there's another operation, make sure
2719 			 * we'll have space to at least encode an error:
2720 			 */
2721 			if (resp->opcnt < args->opcnt)
2722 				plen += COMPOUND_ERR_SLACK_SPACE;
2723 			op->status = nfsd4_check_resp_size(resp, plen);
2724 		}
2725 
2726 		if (op->status)
2727 			goto encode_op;
2728 
2729 		if (op->opdesc->op_get_currentstateid)
2730 			op->opdesc->op_get_currentstateid(cstate, &op->u);
2731 		op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2732 
2733 		/* Only from SEQUENCE */
2734 		if (cstate->status == nfserr_replay_cache) {
2735 			dprintk("%s NFS4.1 replay from cache\n", __func__);
2736 			status = op->status;
2737 			goto out;
2738 		}
2739 		if (!op->status) {
2740 			if (op->opdesc->op_set_currentstateid)
2741 				op->opdesc->op_set_currentstateid(cstate, &op->u);
2742 
2743 			if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2744 				clear_current_stateid(cstate);
2745 
2746 			if (current_fh->fh_export &&
2747 					need_wrongsec_check(rqstp))
2748 				op->status = check_nfsd_access(current_fh->fh_export, rqstp);
2749 		}
2750 encode_op:
2751 		if (op->status == nfserr_replay_me) {
2752 			op->replay = &cstate->replay_owner->so_replay;
2753 			nfsd4_encode_replay(resp->xdr, op);
2754 			status = op->status = op->replay->rp_status;
2755 		} else {
2756 			nfsd4_encode_operation(resp, op);
2757 			status = op->status;
2758 		}
2759 
2760 		trace_nfsd_compound_status(args->opcnt, resp->opcnt, status,
2761 					   nfsd4_op_name(op->opnum));
2762 
2763 		nfsd4_cstate_clear_replay(cstate);
2764 		nfsd4_increment_op_stats(op->opnum);
2765 	}
2766 
2767 	fh_put(current_fh);
2768 	fh_put(save_fh);
2769 	BUG_ON(cstate->replay_owner);
2770 out:
2771 	cstate->status = status;
2772 	/* Reset deferral mechanism for RPC deferrals */
2773 	__set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2774 	return rpc_success;
2775 }
2776 
2777 #define op_encode_hdr_size		(2)
2778 #define op_encode_stateid_maxsz		(XDR_QUADLEN(NFS4_STATEID_SIZE))
2779 #define op_encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2780 #define op_encode_change_info_maxsz	(5)
2781 #define nfs4_fattr_bitmap_maxsz		(4)
2782 
2783 /* We'll fall back on returning no lockowner if run out of space: */
2784 #define op_encode_lockowner_maxsz	(0)
2785 #define op_encode_lock_denied_maxsz	(8 + op_encode_lockowner_maxsz)
2786 
2787 #define nfs4_owner_maxsz		(1 + XDR_QUADLEN(IDMAP_NAMESZ))
2788 
2789 #define op_encode_ace_maxsz		(3 + nfs4_owner_maxsz)
2790 #define op_encode_delegation_maxsz	(1 + op_encode_stateid_maxsz + 1 + \
2791 					 op_encode_ace_maxsz)
2792 
2793 #define op_encode_channel_attrs_maxsz	(6 + 1 + 1)
2794 
nfsd4_only_status_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2795 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2796 {
2797 	return (op_encode_hdr_size) * sizeof(__be32);
2798 }
2799 
nfsd4_status_stateid_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2800 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2801 {
2802 	return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2803 }
2804 
nfsd4_access_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2805 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2806 {
2807 	/* ac_supported, ac_resp_access */
2808 	return (op_encode_hdr_size + 2)* sizeof(__be32);
2809 }
2810 
nfsd4_commit_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2811 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2812 {
2813 	return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2814 }
2815 
nfsd4_create_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2816 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2817 {
2818 	return (op_encode_hdr_size + op_encode_change_info_maxsz
2819 		+ nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2820 }
2821 
2822 /*
2823  * Note since this is an idempotent operation we won't insist on failing
2824  * the op prematurely if the estimate is too large.  We may turn off splice
2825  * reads unnecessarily.
2826  */
nfsd4_getattr_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2827 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
2828 				      struct nfsd4_op *op)
2829 {
2830 	u32 *bmap = op->u.getattr.ga_bmval;
2831 	u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2832 	u32 ret = 0;
2833 
2834 	if (bmap0 & FATTR4_WORD0_ACL)
2835 		return svc_max_payload(rqstp);
2836 	if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2837 		return svc_max_payload(rqstp);
2838 
2839 	if (bmap1 & FATTR4_WORD1_OWNER) {
2840 		ret += IDMAP_NAMESZ + 4;
2841 		bmap1 &= ~FATTR4_WORD1_OWNER;
2842 	}
2843 	if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
2844 		ret += IDMAP_NAMESZ + 4;
2845 		bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
2846 	}
2847 	if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
2848 		ret += NFS4_FHSIZE + 4;
2849 		bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
2850 	}
2851 	if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
2852 		ret += NFS4_MAXLABELLEN + 12;
2853 		bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2854 	}
2855 	/*
2856 	 * Largest of remaining attributes are 16 bytes (e.g.,
2857 	 * supported_attributes)
2858 	 */
2859 	ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
2860 	/* bitmask, length */
2861 	ret += 20;
2862 	return ret;
2863 }
2864 
nfsd4_getfh_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2865 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2866 {
2867 	return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
2868 }
2869 
nfsd4_link_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2870 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2871 {
2872 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
2873 		* sizeof(__be32);
2874 }
2875 
nfsd4_lock_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2876 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2877 {
2878 	return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
2879 		* sizeof(__be32);
2880 }
2881 
nfsd4_open_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2882 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2883 {
2884 	return (op_encode_hdr_size + op_encode_stateid_maxsz
2885 		+ op_encode_change_info_maxsz + 1
2886 		+ nfs4_fattr_bitmap_maxsz
2887 		+ op_encode_delegation_maxsz) * sizeof(__be32);
2888 }
2889 
nfsd4_read_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2890 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2891 {
2892 	u32 maxcount = 0, rlen = 0;
2893 
2894 	maxcount = svc_max_payload(rqstp);
2895 	rlen = min(op->u.read.rd_length, maxcount);
2896 
2897 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
2898 }
2899 
nfsd4_read_plus_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2900 static inline u32 nfsd4_read_plus_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2901 {
2902 	u32 maxcount = svc_max_payload(rqstp);
2903 	u32 rlen = min(op->u.read.rd_length, maxcount);
2904 	/*
2905 	 * If we detect that the file changed during hole encoding, then we
2906 	 * recover by encoding the remaining reply as data. This means we need
2907 	 * to set aside enough room to encode two data segments.
2908 	 */
2909 	u32 seg_len = 2 * (1 + 2 + 1);
2910 
2911 	return (op_encode_hdr_size + 2 + seg_len + XDR_QUADLEN(rlen)) * sizeof(__be32);
2912 }
2913 
nfsd4_readdir_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2914 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2915 {
2916 	u32 maxcount = 0, rlen = 0;
2917 
2918 	maxcount = svc_max_payload(rqstp);
2919 	rlen = min(op->u.readdir.rd_maxcount, maxcount);
2920 
2921 	return (op_encode_hdr_size + op_encode_verifier_maxsz +
2922 		XDR_QUADLEN(rlen)) * sizeof(__be32);
2923 }
2924 
nfsd4_readlink_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2925 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2926 {
2927 	return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
2928 }
2929 
nfsd4_remove_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2930 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2931 {
2932 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
2933 		* sizeof(__be32);
2934 }
2935 
nfsd4_rename_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2936 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2937 {
2938 	return (op_encode_hdr_size + op_encode_change_info_maxsz
2939 		+ op_encode_change_info_maxsz) * sizeof(__be32);
2940 }
2941 
nfsd4_sequence_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2942 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
2943 				       struct nfsd4_op *op)
2944 {
2945 	return (op_encode_hdr_size
2946 		+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
2947 }
2948 
nfsd4_test_stateid_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2949 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2950 {
2951 	return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
2952 		* sizeof(__be32);
2953 }
2954 
nfsd4_setattr_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2955 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2956 {
2957 	return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2958 }
2959 
nfsd4_secinfo_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2960 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2961 {
2962 	return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2963 		(4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2964 }
2965 
nfsd4_setclientid_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2966 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2967 {
2968 	return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2969 								sizeof(__be32);
2970 }
2971 
nfsd4_write_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2972 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2973 {
2974 	return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2975 }
2976 
nfsd4_exchange_id_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2977 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2978 {
2979 	return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2980 		1 + 1 + /* eir_flags, spr_how */\
2981 		4 + /* spo_must_enforce & _allow with bitmap */\
2982 		2 + /*eir_server_owner.so_minor_id */\
2983 		/* eir_server_owner.so_major_id<> */\
2984 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2985 		/* eir_server_scope<> */\
2986 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2987 		1 + /* eir_server_impl_id array length */\
2988 		0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2989 }
2990 
nfsd4_bind_conn_to_session_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2991 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2992 {
2993 	return (op_encode_hdr_size + \
2994 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2995 		2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2996 }
2997 
nfsd4_create_session_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)2998 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2999 {
3000 	return (op_encode_hdr_size + \
3001 		XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
3002 		2 + /* csr_sequence, csr_flags */\
3003 		op_encode_channel_attrs_maxsz + \
3004 		op_encode_channel_attrs_maxsz) * sizeof(__be32);
3005 }
3006 
nfsd4_copy_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3007 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3008 {
3009 	return (op_encode_hdr_size +
3010 		1 /* wr_callback */ +
3011 		op_encode_stateid_maxsz /* wr_callback */ +
3012 		2 /* wr_count */ +
3013 		1 /* wr_committed */ +
3014 		op_encode_verifier_maxsz +
3015 		1 /* cr_consecutive */ +
3016 		1 /* cr_synchronous */) * sizeof(__be32);
3017 }
3018 
nfsd4_offload_status_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3019 static inline u32 nfsd4_offload_status_rsize(struct svc_rqst *rqstp,
3020 					     struct nfsd4_op *op)
3021 {
3022 	return (op_encode_hdr_size +
3023 		2 /* osr_count */ +
3024 		1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
3025 }
3026 
nfsd4_copy_notify_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3027 static inline u32 nfsd4_copy_notify_rsize(struct svc_rqst *rqstp,
3028 					struct nfsd4_op *op)
3029 {
3030 	return (op_encode_hdr_size +
3031 		3 /* cnr_lease_time */ +
3032 		1 /* We support one cnr_source_server */ +
3033 		1 /* cnr_stateid seq */ +
3034 		op_encode_stateid_maxsz /* cnr_stateid */ +
3035 		1 /* num cnr_source_server*/ +
3036 		1 /* nl4_type */ +
3037 		1 /* nl4 size */ +
3038 		XDR_QUADLEN(NFS4_OPAQUE_LIMIT) /*nl4_loc + nl4_loc_sz */)
3039 		* sizeof(__be32);
3040 }
3041 
3042 #ifdef CONFIG_NFSD_PNFS
nfsd4_getdeviceinfo_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3043 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3044 {
3045 	u32 maxcount = 0, rlen = 0;
3046 
3047 	maxcount = svc_max_payload(rqstp);
3048 	rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
3049 
3050 	return (op_encode_hdr_size +
3051 		1 /* gd_layout_type*/ +
3052 		XDR_QUADLEN(rlen) +
3053 		2 /* gd_notify_types */) * sizeof(__be32);
3054 }
3055 
3056 /*
3057  * At this stage we don't really know what layout driver will handle the request,
3058  * so we need to define an arbitrary upper bound here.
3059  */
3060 #define MAX_LAYOUT_SIZE		128
nfsd4_layoutget_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3061 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3062 {
3063 	return (op_encode_hdr_size +
3064 		1 /* logr_return_on_close */ +
3065 		op_encode_stateid_maxsz +
3066 		1 /* nr of layouts */ +
3067 		MAX_LAYOUT_SIZE) * sizeof(__be32);
3068 }
3069 
nfsd4_layoutcommit_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3070 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3071 {
3072 	return (op_encode_hdr_size +
3073 		1 /* locr_newsize */ +
3074 		2 /* ns_size */) * sizeof(__be32);
3075 }
3076 
nfsd4_layoutreturn_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3077 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3078 {
3079 	return (op_encode_hdr_size +
3080 		1 /* lrs_stateid */ +
3081 		op_encode_stateid_maxsz) * sizeof(__be32);
3082 }
3083 #endif /* CONFIG_NFSD_PNFS */
3084 
3085 
nfsd4_seek_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3086 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3087 {
3088 	return (op_encode_hdr_size + 3) * sizeof(__be32);
3089 }
3090 
nfsd4_getxattr_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3091 static inline u32 nfsd4_getxattr_rsize(struct svc_rqst *rqstp,
3092 				       struct nfsd4_op *op)
3093 {
3094 	u32 maxcount, rlen;
3095 
3096 	maxcount = svc_max_payload(rqstp);
3097 	rlen = min_t(u32, XATTR_SIZE_MAX, maxcount);
3098 
3099 	return (op_encode_hdr_size + 1 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3100 }
3101 
nfsd4_setxattr_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3102 static inline u32 nfsd4_setxattr_rsize(struct svc_rqst *rqstp,
3103 				       struct nfsd4_op *op)
3104 {
3105 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
3106 		* sizeof(__be32);
3107 }
nfsd4_listxattrs_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3108 static inline u32 nfsd4_listxattrs_rsize(struct svc_rqst *rqstp,
3109 					 struct nfsd4_op *op)
3110 {
3111 	u32 maxcount, rlen;
3112 
3113 	maxcount = svc_max_payload(rqstp);
3114 	rlen = min(op->u.listxattrs.lsxa_maxcount, maxcount);
3115 
3116 	return (op_encode_hdr_size + 4 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3117 }
3118 
nfsd4_removexattr_rsize(struct svc_rqst * rqstp,struct nfsd4_op * op)3119 static inline u32 nfsd4_removexattr_rsize(struct svc_rqst *rqstp,
3120 					  struct nfsd4_op *op)
3121 {
3122 	return (op_encode_hdr_size + op_encode_change_info_maxsz)
3123 		* sizeof(__be32);
3124 }
3125 
3126 
3127 static const struct nfsd4_operation nfsd4_ops[] = {
3128 	[OP_ACCESS] = {
3129 		.op_func = nfsd4_access,
3130 		.op_name = "OP_ACCESS",
3131 		.op_rsize_bop = nfsd4_access_rsize,
3132 	},
3133 	[OP_CLOSE] = {
3134 		.op_func = nfsd4_close,
3135 		.op_flags = OP_MODIFIES_SOMETHING,
3136 		.op_name = "OP_CLOSE",
3137 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3138 		.op_get_currentstateid = nfsd4_get_closestateid,
3139 		.op_set_currentstateid = nfsd4_set_closestateid,
3140 	},
3141 	[OP_COMMIT] = {
3142 		.op_func = nfsd4_commit,
3143 		.op_flags = OP_MODIFIES_SOMETHING,
3144 		.op_name = "OP_COMMIT",
3145 		.op_rsize_bop = nfsd4_commit_rsize,
3146 	},
3147 	[OP_CREATE] = {
3148 		.op_func = nfsd4_create,
3149 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
3150 		.op_name = "OP_CREATE",
3151 		.op_rsize_bop = nfsd4_create_rsize,
3152 	},
3153 	[OP_DELEGRETURN] = {
3154 		.op_func = nfsd4_delegreturn,
3155 		.op_flags = OP_MODIFIES_SOMETHING,
3156 		.op_name = "OP_DELEGRETURN",
3157 		.op_rsize_bop = nfsd4_only_status_rsize,
3158 		.op_get_currentstateid = nfsd4_get_delegreturnstateid,
3159 	},
3160 	[OP_GETATTR] = {
3161 		.op_func = nfsd4_getattr,
3162 		.op_flags = ALLOWED_ON_ABSENT_FS,
3163 		.op_rsize_bop = nfsd4_getattr_rsize,
3164 		.op_name = "OP_GETATTR",
3165 	},
3166 	[OP_GETFH] = {
3167 		.op_func = nfsd4_getfh,
3168 		.op_name = "OP_GETFH",
3169 		.op_rsize_bop = nfsd4_getfh_rsize,
3170 	},
3171 	[OP_LINK] = {
3172 		.op_func = nfsd4_link,
3173 		.op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
3174 				| OP_CACHEME,
3175 		.op_name = "OP_LINK",
3176 		.op_rsize_bop = nfsd4_link_rsize,
3177 	},
3178 	[OP_LOCK] = {
3179 		.op_func = nfsd4_lock,
3180 		.op_flags = OP_MODIFIES_SOMETHING |
3181 				OP_NONTRIVIAL_ERROR_ENCODE,
3182 		.op_name = "OP_LOCK",
3183 		.op_rsize_bop = nfsd4_lock_rsize,
3184 		.op_set_currentstateid = nfsd4_set_lockstateid,
3185 	},
3186 	[OP_LOCKT] = {
3187 		.op_func = nfsd4_lockt,
3188 		.op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
3189 		.op_name = "OP_LOCKT",
3190 		.op_rsize_bop = nfsd4_lock_rsize,
3191 	},
3192 	[OP_LOCKU] = {
3193 		.op_func = nfsd4_locku,
3194 		.op_flags = OP_MODIFIES_SOMETHING,
3195 		.op_name = "OP_LOCKU",
3196 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3197 		.op_get_currentstateid = nfsd4_get_lockustateid,
3198 	},
3199 	[OP_LOOKUP] = {
3200 		.op_func = nfsd4_lookup,
3201 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3202 		.op_name = "OP_LOOKUP",
3203 		.op_rsize_bop = nfsd4_only_status_rsize,
3204 	},
3205 	[OP_LOOKUPP] = {
3206 		.op_func = nfsd4_lookupp,
3207 		.op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3208 		.op_name = "OP_LOOKUPP",
3209 		.op_rsize_bop = nfsd4_only_status_rsize,
3210 	},
3211 	[OP_NVERIFY] = {
3212 		.op_func = nfsd4_nverify,
3213 		.op_name = "OP_NVERIFY",
3214 		.op_rsize_bop = nfsd4_only_status_rsize,
3215 	},
3216 	[OP_OPEN] = {
3217 		.op_func = nfsd4_open,
3218 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3219 		.op_name = "OP_OPEN",
3220 		.op_rsize_bop = nfsd4_open_rsize,
3221 		.op_set_currentstateid = nfsd4_set_openstateid,
3222 	},
3223 	[OP_OPEN_CONFIRM] = {
3224 		.op_func = nfsd4_open_confirm,
3225 		.op_flags = OP_MODIFIES_SOMETHING,
3226 		.op_name = "OP_OPEN_CONFIRM",
3227 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3228 	},
3229 	[OP_OPEN_DOWNGRADE] = {
3230 		.op_func = nfsd4_open_downgrade,
3231 		.op_flags = OP_MODIFIES_SOMETHING,
3232 		.op_name = "OP_OPEN_DOWNGRADE",
3233 		.op_rsize_bop = nfsd4_status_stateid_rsize,
3234 		.op_get_currentstateid = nfsd4_get_opendowngradestateid,
3235 		.op_set_currentstateid = nfsd4_set_opendowngradestateid,
3236 	},
3237 	[OP_PUTFH] = {
3238 		.op_func = nfsd4_putfh,
3239 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3240 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3241 		.op_name = "OP_PUTFH",
3242 		.op_rsize_bop = nfsd4_only_status_rsize,
3243 	},
3244 	[OP_PUTPUBFH] = {
3245 		.op_func = nfsd4_putrootfh,
3246 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3247 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3248 		.op_name = "OP_PUTPUBFH",
3249 		.op_rsize_bop = nfsd4_only_status_rsize,
3250 	},
3251 	[OP_PUTROOTFH] = {
3252 		.op_func = nfsd4_putrootfh,
3253 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3254 				| OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3255 		.op_name = "OP_PUTROOTFH",
3256 		.op_rsize_bop = nfsd4_only_status_rsize,
3257 	},
3258 	[OP_READ] = {
3259 		.op_func = nfsd4_read,
3260 		.op_release = nfsd4_read_release,
3261 		.op_name = "OP_READ",
3262 		.op_rsize_bop = nfsd4_read_rsize,
3263 		.op_get_currentstateid = nfsd4_get_readstateid,
3264 	},
3265 	[OP_READDIR] = {
3266 		.op_func = nfsd4_readdir,
3267 		.op_name = "OP_READDIR",
3268 		.op_rsize_bop = nfsd4_readdir_rsize,
3269 	},
3270 	[OP_READLINK] = {
3271 		.op_func = nfsd4_readlink,
3272 		.op_name = "OP_READLINK",
3273 		.op_rsize_bop = nfsd4_readlink_rsize,
3274 	},
3275 	[OP_REMOVE] = {
3276 		.op_func = nfsd4_remove,
3277 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3278 		.op_name = "OP_REMOVE",
3279 		.op_rsize_bop = nfsd4_remove_rsize,
3280 	},
3281 	[OP_RENAME] = {
3282 		.op_func = nfsd4_rename,
3283 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3284 		.op_name = "OP_RENAME",
3285 		.op_rsize_bop = nfsd4_rename_rsize,
3286 	},
3287 	[OP_RENEW] = {
3288 		.op_func = nfsd4_renew,
3289 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3290 				| OP_MODIFIES_SOMETHING,
3291 		.op_name = "OP_RENEW",
3292 		.op_rsize_bop = nfsd4_only_status_rsize,
3293 
3294 	},
3295 	[OP_RESTOREFH] = {
3296 		.op_func = nfsd4_restorefh,
3297 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3298 				| OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
3299 		.op_name = "OP_RESTOREFH",
3300 		.op_rsize_bop = nfsd4_only_status_rsize,
3301 	},
3302 	[OP_SAVEFH] = {
3303 		.op_func = nfsd4_savefh,
3304 		.op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3305 		.op_name = "OP_SAVEFH",
3306 		.op_rsize_bop = nfsd4_only_status_rsize,
3307 	},
3308 	[OP_SECINFO] = {
3309 		.op_func = nfsd4_secinfo,
3310 		.op_release = nfsd4_secinfo_release,
3311 		.op_flags = OP_HANDLES_WRONGSEC,
3312 		.op_name = "OP_SECINFO",
3313 		.op_rsize_bop = nfsd4_secinfo_rsize,
3314 	},
3315 	[OP_SETATTR] = {
3316 		.op_func = nfsd4_setattr,
3317 		.op_name = "OP_SETATTR",
3318 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
3319 				| OP_NONTRIVIAL_ERROR_ENCODE,
3320 		.op_rsize_bop = nfsd4_setattr_rsize,
3321 		.op_get_currentstateid = nfsd4_get_setattrstateid,
3322 	},
3323 	[OP_SETCLIENTID] = {
3324 		.op_func = nfsd4_setclientid,
3325 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3326 				| OP_MODIFIES_SOMETHING | OP_CACHEME
3327 				| OP_NONTRIVIAL_ERROR_ENCODE,
3328 		.op_name = "OP_SETCLIENTID",
3329 		.op_rsize_bop = nfsd4_setclientid_rsize,
3330 	},
3331 	[OP_SETCLIENTID_CONFIRM] = {
3332 		.op_func = nfsd4_setclientid_confirm,
3333 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3334 				| OP_MODIFIES_SOMETHING | OP_CACHEME,
3335 		.op_name = "OP_SETCLIENTID_CONFIRM",
3336 		.op_rsize_bop = nfsd4_only_status_rsize,
3337 	},
3338 	[OP_VERIFY] = {
3339 		.op_func = nfsd4_verify,
3340 		.op_name = "OP_VERIFY",
3341 		.op_rsize_bop = nfsd4_only_status_rsize,
3342 	},
3343 	[OP_WRITE] = {
3344 		.op_func = nfsd4_write,
3345 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3346 		.op_name = "OP_WRITE",
3347 		.op_rsize_bop = nfsd4_write_rsize,
3348 		.op_get_currentstateid = nfsd4_get_writestateid,
3349 	},
3350 	[OP_RELEASE_LOCKOWNER] = {
3351 		.op_func = nfsd4_release_lockowner,
3352 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3353 				| OP_MODIFIES_SOMETHING,
3354 		.op_name = "OP_RELEASE_LOCKOWNER",
3355 		.op_rsize_bop = nfsd4_only_status_rsize,
3356 	},
3357 
3358 	/* NFSv4.1 operations */
3359 	[OP_EXCHANGE_ID] = {
3360 		.op_func = nfsd4_exchange_id,
3361 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3362 				| OP_MODIFIES_SOMETHING,
3363 		.op_name = "OP_EXCHANGE_ID",
3364 		.op_rsize_bop = nfsd4_exchange_id_rsize,
3365 	},
3366 	[OP_BACKCHANNEL_CTL] = {
3367 		.op_func = nfsd4_backchannel_ctl,
3368 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3369 		.op_name = "OP_BACKCHANNEL_CTL",
3370 		.op_rsize_bop = nfsd4_only_status_rsize,
3371 	},
3372 	[OP_BIND_CONN_TO_SESSION] = {
3373 		.op_func = nfsd4_bind_conn_to_session,
3374 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3375 				| OP_MODIFIES_SOMETHING,
3376 		.op_name = "OP_BIND_CONN_TO_SESSION",
3377 		.op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
3378 	},
3379 	[OP_CREATE_SESSION] = {
3380 		.op_func = nfsd4_create_session,
3381 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3382 				| OP_MODIFIES_SOMETHING,
3383 		.op_name = "OP_CREATE_SESSION",
3384 		.op_rsize_bop = nfsd4_create_session_rsize,
3385 	},
3386 	[OP_DESTROY_SESSION] = {
3387 		.op_func = nfsd4_destroy_session,
3388 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3389 				| OP_MODIFIES_SOMETHING,
3390 		.op_name = "OP_DESTROY_SESSION",
3391 		.op_rsize_bop = nfsd4_only_status_rsize,
3392 	},
3393 	[OP_SEQUENCE] = {
3394 		.op_func = nfsd4_sequence,
3395 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
3396 		.op_name = "OP_SEQUENCE",
3397 		.op_rsize_bop = nfsd4_sequence_rsize,
3398 	},
3399 	[OP_DESTROY_CLIENTID] = {
3400 		.op_func = nfsd4_destroy_clientid,
3401 		.op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3402 				| OP_MODIFIES_SOMETHING,
3403 		.op_name = "OP_DESTROY_CLIENTID",
3404 		.op_rsize_bop = nfsd4_only_status_rsize,
3405 	},
3406 	[OP_RECLAIM_COMPLETE] = {
3407 		.op_func = nfsd4_reclaim_complete,
3408 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3409 		.op_name = "OP_RECLAIM_COMPLETE",
3410 		.op_rsize_bop = nfsd4_only_status_rsize,
3411 	},
3412 	[OP_SECINFO_NO_NAME] = {
3413 		.op_func = nfsd4_secinfo_no_name,
3414 		.op_release = nfsd4_secinfo_no_name_release,
3415 		.op_flags = OP_HANDLES_WRONGSEC,
3416 		.op_name = "OP_SECINFO_NO_NAME",
3417 		.op_rsize_bop = nfsd4_secinfo_rsize,
3418 	},
3419 	[OP_TEST_STATEID] = {
3420 		.op_func = nfsd4_test_stateid,
3421 		.op_flags = ALLOWED_WITHOUT_FH,
3422 		.op_name = "OP_TEST_STATEID",
3423 		.op_rsize_bop = nfsd4_test_stateid_rsize,
3424 	},
3425 	[OP_FREE_STATEID] = {
3426 		.op_func = nfsd4_free_stateid,
3427 		.op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3428 		.op_name = "OP_FREE_STATEID",
3429 		.op_get_currentstateid = nfsd4_get_freestateid,
3430 		.op_rsize_bop = nfsd4_only_status_rsize,
3431 	},
3432 #ifdef CONFIG_NFSD_PNFS
3433 	[OP_GETDEVICEINFO] = {
3434 		.op_func = nfsd4_getdeviceinfo,
3435 		.op_release = nfsd4_getdeviceinfo_release,
3436 		.op_flags = ALLOWED_WITHOUT_FH,
3437 		.op_name = "OP_GETDEVICEINFO",
3438 		.op_rsize_bop = nfsd4_getdeviceinfo_rsize,
3439 	},
3440 	[OP_LAYOUTGET] = {
3441 		.op_func = nfsd4_layoutget,
3442 		.op_release = nfsd4_layoutget_release,
3443 		.op_flags = OP_MODIFIES_SOMETHING,
3444 		.op_name = "OP_LAYOUTGET",
3445 		.op_rsize_bop = nfsd4_layoutget_rsize,
3446 	},
3447 	[OP_LAYOUTCOMMIT] = {
3448 		.op_func = nfsd4_layoutcommit,
3449 		.op_flags = OP_MODIFIES_SOMETHING,
3450 		.op_name = "OP_LAYOUTCOMMIT",
3451 		.op_rsize_bop = nfsd4_layoutcommit_rsize,
3452 	},
3453 	[OP_LAYOUTRETURN] = {
3454 		.op_func = nfsd4_layoutreturn,
3455 		.op_flags = OP_MODIFIES_SOMETHING,
3456 		.op_name = "OP_LAYOUTRETURN",
3457 		.op_rsize_bop = nfsd4_layoutreturn_rsize,
3458 	},
3459 #endif /* CONFIG_NFSD_PNFS */
3460 
3461 	/* NFSv4.2 operations */
3462 	[OP_ALLOCATE] = {
3463 		.op_func = nfsd4_allocate,
3464 		.op_flags = OP_MODIFIES_SOMETHING,
3465 		.op_name = "OP_ALLOCATE",
3466 		.op_rsize_bop = nfsd4_only_status_rsize,
3467 	},
3468 	[OP_DEALLOCATE] = {
3469 		.op_func = nfsd4_deallocate,
3470 		.op_flags = OP_MODIFIES_SOMETHING,
3471 		.op_name = "OP_DEALLOCATE",
3472 		.op_rsize_bop = nfsd4_only_status_rsize,
3473 	},
3474 	[OP_CLONE] = {
3475 		.op_func = nfsd4_clone,
3476 		.op_flags = OP_MODIFIES_SOMETHING,
3477 		.op_name = "OP_CLONE",
3478 		.op_rsize_bop = nfsd4_only_status_rsize,
3479 	},
3480 	[OP_COPY] = {
3481 		.op_func = nfsd4_copy,
3482 		.op_flags = OP_MODIFIES_SOMETHING,
3483 		.op_name = "OP_COPY",
3484 		.op_rsize_bop = nfsd4_copy_rsize,
3485 	},
3486 	[OP_READ_PLUS] = {
3487 		.op_func = nfsd4_read,
3488 		.op_release = nfsd4_read_release,
3489 		.op_name = "OP_READ_PLUS",
3490 		.op_rsize_bop = nfsd4_read_plus_rsize,
3491 		.op_get_currentstateid = nfsd4_get_readstateid,
3492 	},
3493 	[OP_SEEK] = {
3494 		.op_func = nfsd4_seek,
3495 		.op_name = "OP_SEEK",
3496 		.op_rsize_bop = nfsd4_seek_rsize,
3497 	},
3498 	[OP_OFFLOAD_STATUS] = {
3499 		.op_func = nfsd4_offload_status,
3500 		.op_name = "OP_OFFLOAD_STATUS",
3501 		.op_rsize_bop = nfsd4_offload_status_rsize,
3502 	},
3503 	[OP_OFFLOAD_CANCEL] = {
3504 		.op_func = nfsd4_offload_cancel,
3505 		.op_flags = OP_MODIFIES_SOMETHING,
3506 		.op_name = "OP_OFFLOAD_CANCEL",
3507 		.op_rsize_bop = nfsd4_only_status_rsize,
3508 	},
3509 	[OP_COPY_NOTIFY] = {
3510 		.op_func = nfsd4_copy_notify,
3511 		.op_flags = OP_MODIFIES_SOMETHING,
3512 		.op_name = "OP_COPY_NOTIFY",
3513 		.op_rsize_bop = nfsd4_copy_notify_rsize,
3514 	},
3515 	[OP_GETXATTR] = {
3516 		.op_func = nfsd4_getxattr,
3517 		.op_name = "OP_GETXATTR",
3518 		.op_rsize_bop = nfsd4_getxattr_rsize,
3519 	},
3520 	[OP_SETXATTR] = {
3521 		.op_func = nfsd4_setxattr,
3522 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3523 		.op_name = "OP_SETXATTR",
3524 		.op_rsize_bop = nfsd4_setxattr_rsize,
3525 	},
3526 	[OP_LISTXATTRS] = {
3527 		.op_func = nfsd4_listxattrs,
3528 		.op_name = "OP_LISTXATTRS",
3529 		.op_rsize_bop = nfsd4_listxattrs_rsize,
3530 	},
3531 	[OP_REMOVEXATTR] = {
3532 		.op_func = nfsd4_removexattr,
3533 		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3534 		.op_name = "OP_REMOVEXATTR",
3535 		.op_rsize_bop = nfsd4_removexattr_rsize,
3536 	},
3537 };
3538 
3539 /**
3540  * nfsd4_spo_must_allow - Determine if the compound op contains an
3541  * operation that is allowed to be sent with machine credentials
3542  *
3543  * @rqstp: a pointer to the struct svc_rqst
3544  *
3545  * Checks to see if the compound contains a spo_must_allow op
3546  * and confirms that it was sent with the proper machine creds.
3547  */
3548 
nfsd4_spo_must_allow(struct svc_rqst * rqstp)3549 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
3550 {
3551 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
3552 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3553 	struct nfsd4_op *this;
3554 	struct nfsd4_compound_state *cstate = &resp->cstate;
3555 	struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
3556 	u32 opiter;
3557 
3558 	if (!cstate->minorversion)
3559 		return false;
3560 
3561 	if (cstate->spo_must_allowed)
3562 		return true;
3563 
3564 	opiter = resp->opcnt;
3565 	while (opiter < argp->opcnt) {
3566 		this = &argp->ops[opiter++];
3567 		if (test_bit(this->opnum, allow->u.longs) &&
3568 			cstate->clp->cl_mach_cred &&
3569 			nfsd4_mach_creds_match(cstate->clp, rqstp)) {
3570 			cstate->spo_must_allowed = true;
3571 			return true;
3572 		}
3573 	}
3574 	cstate->spo_must_allowed = false;
3575 	return false;
3576 }
3577 
nfsd4_max_reply(struct svc_rqst * rqstp,struct nfsd4_op * op)3578 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
3579 {
3580 	if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
3581 		return op_encode_hdr_size * sizeof(__be32);
3582 
3583 	BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
3584 	return OPDESC(op)->op_rsize_bop(rqstp, op);
3585 }
3586 
warn_on_nonidempotent_op(struct nfsd4_op * op)3587 void warn_on_nonidempotent_op(struct nfsd4_op *op)
3588 {
3589 	if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
3590 		pr_err("unable to encode reply to nonidempotent op %u (%s)\n",
3591 			op->opnum, nfsd4_op_name(op->opnum));
3592 		WARN_ON_ONCE(1);
3593 	}
3594 }
3595 
nfsd4_op_name(unsigned opnum)3596 static const char *nfsd4_op_name(unsigned opnum)
3597 {
3598 	if (opnum < ARRAY_SIZE(nfsd4_ops))
3599 		return nfsd4_ops[opnum].op_name;
3600 	return "unknown_operation";
3601 }
3602 
3603 static const struct svc_procedure nfsd_procedures4[2] = {
3604 	[NFSPROC4_NULL] = {
3605 		.pc_func = nfsd4_proc_null,
3606 		.pc_decode = nfssvc_decode_voidarg,
3607 		.pc_encode = nfssvc_encode_voidres,
3608 		.pc_argsize = sizeof(struct nfsd_voidargs),
3609 		.pc_ressize = sizeof(struct nfsd_voidres),
3610 		.pc_cachetype = RC_NOCACHE,
3611 		.pc_xdrressize = 1,
3612 		.pc_name = "NULL",
3613 	},
3614 	[NFSPROC4_COMPOUND] = {
3615 		.pc_func = nfsd4_proc_compound,
3616 		.pc_decode = nfs4svc_decode_compoundargs,
3617 		.pc_encode = nfs4svc_encode_compoundres,
3618 		.pc_argsize = sizeof(struct nfsd4_compoundargs),
3619 		.pc_ressize = sizeof(struct nfsd4_compoundres),
3620 		.pc_release = nfsd4_release_compoundargs,
3621 		.pc_cachetype = RC_NOCACHE,
3622 		.pc_xdrressize = NFSD_BUFSIZE/4,
3623 		.pc_name = "COMPOUND",
3624 	},
3625 };
3626 
3627 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
3628 const struct svc_version nfsd_version4 = {
3629 	.vs_vers		= 4,
3630 	.vs_nproc		= 2,
3631 	.vs_proc		= nfsd_procedures4,
3632 	.vs_count		= nfsd_count3,
3633 	.vs_dispatch		= nfsd_dispatch,
3634 	.vs_xdrsize		= NFS4_SVC_XDRSIZE,
3635 	.vs_rpcb_optnl		= true,
3636 	.vs_need_cong_ctrl	= true,
3637 };
3638