1 /*
2 * fs/cifs/cifsfs.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * Common Internet FileSystem (CIFS) client
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 /* Note that BB means BUGBUG (ie something to fix eventually) */
25
26 #include <linux/module.h>
27 #include <linux/fs.h>
28 #include <linux/mount.h>
29 #include <linux/slab.h>
30 #include <linux/init.h>
31 #include <linux/list.h>
32 #include <linux/seq_file.h>
33 #include <linux/vfs.h>
34 #include <linux/mempool.h>
35 #include <linux/delay.h>
36 #include <linux/kthread.h>
37 #include <linux/freezer.h>
38 #include <net/ipv6.h>
39 #include "cifsfs.h"
40 #include "cifspdu.h"
41 #define DECLARE_GLOBALS_HERE
42 #include "cifsglob.h"
43 #include "cifsproto.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
46 #include <linux/mm.h>
47 #include <linux/key-type.h>
48 #include "cifs_spnego.h"
49 #include "fscache.h"
50 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
51
52 int cifsFYI = 0;
53 int cifsERROR = 1;
54 int traceSMB = 0;
55 unsigned int oplockEnabled = 1;
56 unsigned int linuxExtEnabled = 1;
57 unsigned int lookupCacheEnabled = 1;
58 unsigned int multiuser_mount = 0;
59 unsigned int global_secflags = CIFSSEC_DEF;
60 /* unsigned int ntlmv2_support = 0; */
61 unsigned int sign_CIFS_PDUs = 1;
62 static const struct super_operations cifs_super_ops;
63 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
64 module_param(CIFSMaxBufSize, int, 0);
65 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
66 "Default: 16384 Range: 8192 to 130048");
67 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
68 module_param(cifs_min_rcv, int, 0);
69 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
70 "1 to 64");
71 unsigned int cifs_min_small = 30;
72 module_param(cifs_min_small, int, 0);
73 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
74 "Range: 2 to 256");
75 unsigned int cifs_max_pending = CIFS_MAX_REQ;
76 module_param(cifs_max_pending, int, 0);
77 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
78 "Default: 50 Range: 2 to 256");
79 unsigned short echo_retries = 5;
80 module_param(echo_retries, ushort, 0644);
81 MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
82 "reconnecting server. Default: 5. 0 means "
83 "never reconnect.");
84 extern mempool_t *cifs_sm_req_poolp;
85 extern mempool_t *cifs_req_poolp;
86 extern mempool_t *cifs_mid_poolp;
87
88 void
cifs_sb_active(struct super_block * sb)89 cifs_sb_active(struct super_block *sb)
90 {
91 struct cifs_sb_info *server = CIFS_SB(sb);
92
93 if (atomic_inc_return(&server->active) == 1)
94 atomic_inc(&sb->s_active);
95 }
96
97 void
cifs_sb_deactive(struct super_block * sb)98 cifs_sb_deactive(struct super_block *sb)
99 {
100 struct cifs_sb_info *server = CIFS_SB(sb);
101
102 if (atomic_dec_and_test(&server->active))
103 deactivate_super(sb);
104 }
105
106 static int
cifs_read_super(struct super_block * sb,void * data,const char * devname,int silent)107 cifs_read_super(struct super_block *sb, void *data,
108 const char *devname, int silent)
109 {
110 struct inode *inode;
111 struct cifs_sb_info *cifs_sb;
112 int rc = 0;
113
114 /* BB should we make this contingent on mount parm? */
115 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
116 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
117 cifs_sb = CIFS_SB(sb);
118 if (cifs_sb == NULL)
119 return -ENOMEM;
120
121 spin_lock_init(&cifs_sb->tlink_tree_lock);
122 cifs_sb->tlink_tree = RB_ROOT;
123
124 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
125 if (rc) {
126 kfree(cifs_sb);
127 return rc;
128 }
129 cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
130
131 #ifdef CONFIG_CIFS_DFS_UPCALL
132 /* copy mount params to sb for use in submounts */
133 /* BB: should we move this after the mount so we
134 * do not have to do the copy on failed mounts?
135 * BB: May be it is better to do simple copy before
136 * complex operation (mount), and in case of fail
137 * just exit instead of doing mount and attempting
138 * undo it if this copy fails?*/
139 if (data) {
140 int len = strlen(data);
141 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
142 if (cifs_sb->mountdata == NULL) {
143 bdi_destroy(&cifs_sb->bdi);
144 kfree(sb->s_fs_info);
145 sb->s_fs_info = NULL;
146 return -ENOMEM;
147 }
148 strncpy(cifs_sb->mountdata, data, len + 1);
149 cifs_sb->mountdata[len] = '\0';
150 }
151 #endif
152
153 rc = cifs_mount(sb, cifs_sb, data, devname);
154
155 if (rc) {
156 if (!silent)
157 cERROR(1, "cifs_mount failed w/return code = %d", rc);
158 goto out_mount_failed;
159 }
160
161 sb->s_magic = CIFS_MAGIC_NUMBER;
162 sb->s_op = &cifs_super_ops;
163 sb->s_bdi = &cifs_sb->bdi;
164 sb->s_blocksize = CIFS_MAX_MSGSIZE;
165 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
166 inode = cifs_root_iget(sb, ROOT_I);
167
168 if (IS_ERR(inode)) {
169 rc = PTR_ERR(inode);
170 inode = NULL;
171 goto out_no_root;
172 }
173
174 sb->s_root = d_alloc_root(inode);
175
176 if (!sb->s_root) {
177 rc = -ENOMEM;
178 goto out_no_root;
179 }
180
181 /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
182 if (cifs_sb_master_tcon(cifs_sb)->nocase)
183 sb->s_d_op = &cifs_ci_dentry_ops;
184 else
185 sb->s_d_op = &cifs_dentry_ops;
186
187 #ifdef CONFIG_CIFS_EXPERIMENTAL
188 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
189 cFYI(1, "export ops supported");
190 sb->s_export_op = &cifs_export_ops;
191 }
192 #endif /* EXPERIMENTAL */
193
194 return 0;
195
196 out_no_root:
197 cERROR(1, "cifs_read_super: get root inode failed");
198 if (inode)
199 iput(inode);
200
201 cifs_umount(sb, cifs_sb);
202
203 out_mount_failed:
204 if (cifs_sb) {
205 #ifdef CONFIG_CIFS_DFS_UPCALL
206 if (cifs_sb->mountdata) {
207 kfree(cifs_sb->mountdata);
208 cifs_sb->mountdata = NULL;
209 }
210 #endif
211 unload_nls(cifs_sb->local_nls);
212 bdi_destroy(&cifs_sb->bdi);
213 kfree(cifs_sb);
214 }
215 return rc;
216 }
217
218 static void
cifs_put_super(struct super_block * sb)219 cifs_put_super(struct super_block *sb)
220 {
221 int rc = 0;
222 struct cifs_sb_info *cifs_sb;
223
224 cFYI(1, "In cifs_put_super");
225 cifs_sb = CIFS_SB(sb);
226 if (cifs_sb == NULL) {
227 cFYI(1, "Empty cifs superblock info passed to unmount");
228 return;
229 }
230
231 rc = cifs_umount(sb, cifs_sb);
232 if (rc)
233 cERROR(1, "cifs_umount failed with return code %d", rc);
234 #ifdef CONFIG_CIFS_DFS_UPCALL
235 if (cifs_sb->mountdata) {
236 kfree(cifs_sb->mountdata);
237 cifs_sb->mountdata = NULL;
238 }
239 #endif
240
241 unload_nls(cifs_sb->local_nls);
242 bdi_destroy(&cifs_sb->bdi);
243 kfree(cifs_sb);
244 }
245
246 static int
cifs_statfs(struct dentry * dentry,struct kstatfs * buf)247 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
248 {
249 struct super_block *sb = dentry->d_sb;
250 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
251 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
252 int rc = -EOPNOTSUPP;
253 int xid;
254
255 xid = GetXid();
256
257 buf->f_type = CIFS_MAGIC_NUMBER;
258
259 /*
260 * PATH_MAX may be too long - it would presumably be total path,
261 * but note that some servers (includinng Samba 3) have a shorter
262 * maximum path.
263 *
264 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
265 */
266 buf->f_namelen = PATH_MAX;
267 buf->f_files = 0; /* undefined */
268 buf->f_ffree = 0; /* unlimited */
269
270 /*
271 * We could add a second check for a QFS Unix capability bit
272 */
273 if ((tcon->ses->capabilities & CAP_UNIX) &&
274 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
275 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
276
277 /*
278 * Only need to call the old QFSInfo if failed on newer one,
279 * e.g. by OS/2.
280 **/
281 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
282 rc = CIFSSMBQFSInfo(xid, tcon, buf);
283
284 /*
285 * Some old Windows servers also do not support level 103, retry with
286 * older level one if old server failed the previous call or we
287 * bypassed it because we detected that this was an older LANMAN sess
288 */
289 if (rc)
290 rc = SMBOldQFSInfo(xid, tcon, buf);
291
292 FreeXid(xid);
293 return 0;
294 }
295
cifs_permission(struct inode * inode,int mask,unsigned int flags)296 static int cifs_permission(struct inode *inode, int mask, unsigned int flags)
297 {
298 struct cifs_sb_info *cifs_sb;
299
300 if (flags & IPERM_FLAG_RCU)
301 return -ECHILD;
302
303 cifs_sb = CIFS_SB(inode->i_sb);
304
305 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
306 if ((mask & MAY_EXEC) && !execute_ok(inode))
307 return -EACCES;
308 else
309 return 0;
310 } else /* file mode might have been restricted at mount time
311 on the client (above and beyond ACL on servers) for
312 servers which do not support setting and viewing mode bits,
313 so allowing client to check permissions is useful */
314 return generic_permission(inode, mask, flags, NULL);
315 }
316
317 static struct kmem_cache *cifs_inode_cachep;
318 static struct kmem_cache *cifs_req_cachep;
319 static struct kmem_cache *cifs_mid_cachep;
320 static struct kmem_cache *cifs_sm_req_cachep;
321 mempool_t *cifs_sm_req_poolp;
322 mempool_t *cifs_req_poolp;
323 mempool_t *cifs_mid_poolp;
324
325 static struct inode *
cifs_alloc_inode(struct super_block * sb)326 cifs_alloc_inode(struct super_block *sb)
327 {
328 struct cifsInodeInfo *cifs_inode;
329 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
330 if (!cifs_inode)
331 return NULL;
332 cifs_inode->cifsAttrs = 0x20; /* default */
333 cifs_inode->time = 0;
334 /* Until the file is open and we have gotten oplock
335 info back from the server, can not assume caching of
336 file data or metadata */
337 cifs_set_oplock_level(cifs_inode, 0);
338 cifs_inode->delete_pending = false;
339 cifs_inode->invalid_mapping = false;
340 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
341 cifs_inode->server_eof = 0;
342 cifs_inode->uniqueid = 0;
343 cifs_inode->createtime = 0;
344
345 /* Can not set i_flags here - they get immediately overwritten
346 to zero by the VFS */
347 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
348 INIT_LIST_HEAD(&cifs_inode->openFileList);
349 return &cifs_inode->vfs_inode;
350 }
351
cifs_i_callback(struct rcu_head * head)352 static void cifs_i_callback(struct rcu_head *head)
353 {
354 struct inode *inode = container_of(head, struct inode, i_rcu);
355 INIT_LIST_HEAD(&inode->i_dentry);
356 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
357 }
358
359 static void
cifs_destroy_inode(struct inode * inode)360 cifs_destroy_inode(struct inode *inode)
361 {
362 call_rcu(&inode->i_rcu, cifs_i_callback);
363 }
364
365 static void
cifs_evict_inode(struct inode * inode)366 cifs_evict_inode(struct inode *inode)
367 {
368 truncate_inode_pages(&inode->i_data, 0);
369 end_writeback(inode);
370 cifs_fscache_release_inode_cookie(inode);
371 }
372
373 static void
cifs_show_address(struct seq_file * s,struct TCP_Server_Info * server)374 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
375 {
376 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
377 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
378
379 seq_printf(s, ",addr=");
380
381 switch (server->dstaddr.ss_family) {
382 case AF_INET:
383 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
384 break;
385 case AF_INET6:
386 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
387 if (sa6->sin6_scope_id)
388 seq_printf(s, "%%%u", sa6->sin6_scope_id);
389 break;
390 default:
391 seq_printf(s, "(unknown)");
392 }
393 }
394
395 /*
396 * cifs_show_options() is for displaying mount options in /proc/mounts.
397 * Not all settable options are displayed but most of the important
398 * ones are.
399 */
400 static int
cifs_show_options(struct seq_file * s,struct vfsmount * m)401 cifs_show_options(struct seq_file *s, struct vfsmount *m)
402 {
403 struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
404 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
405 struct sockaddr *srcaddr;
406 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
407
408 seq_printf(s, ",unc=%s", tcon->treeName);
409
410 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
411 seq_printf(s, ",multiuser");
412 else if (tcon->ses->user_name)
413 seq_printf(s, ",username=%s", tcon->ses->user_name);
414
415 if (tcon->ses->domainName)
416 seq_printf(s, ",domain=%s", tcon->ses->domainName);
417
418 if (srcaddr->sa_family != AF_UNSPEC) {
419 struct sockaddr_in *saddr4;
420 struct sockaddr_in6 *saddr6;
421 saddr4 = (struct sockaddr_in *)srcaddr;
422 saddr6 = (struct sockaddr_in6 *)srcaddr;
423 if (srcaddr->sa_family == AF_INET6)
424 seq_printf(s, ",srcaddr=%pI6c",
425 &saddr6->sin6_addr);
426 else if (srcaddr->sa_family == AF_INET)
427 seq_printf(s, ",srcaddr=%pI4",
428 &saddr4->sin_addr.s_addr);
429 else
430 seq_printf(s, ",srcaddr=BAD-AF:%i",
431 (int)(srcaddr->sa_family));
432 }
433
434 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
435 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
436 seq_printf(s, ",forceuid");
437 else
438 seq_printf(s, ",noforceuid");
439
440 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
441 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
442 seq_printf(s, ",forcegid");
443 else
444 seq_printf(s, ",noforcegid");
445
446 cifs_show_address(s, tcon->ses->server);
447
448 if (!tcon->unix_ext)
449 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
450 cifs_sb->mnt_file_mode,
451 cifs_sb->mnt_dir_mode);
452 if (tcon->seal)
453 seq_printf(s, ",seal");
454 if (tcon->nocase)
455 seq_printf(s, ",nocase");
456 if (tcon->retry)
457 seq_printf(s, ",hard");
458 if (cifs_sb->prepath)
459 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
460 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
461 seq_printf(s, ",posixpaths");
462 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
463 seq_printf(s, ",setuids");
464 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
465 seq_printf(s, ",serverino");
466 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
467 seq_printf(s, ",directio");
468 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
469 seq_printf(s, ",nouser_xattr");
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
471 seq_printf(s, ",mapchars");
472 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
473 seq_printf(s, ",sfu");
474 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
475 seq_printf(s, ",nobrl");
476 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
477 seq_printf(s, ",cifsacl");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
479 seq_printf(s, ",dynperm");
480 if (m->mnt_sb->s_flags & MS_POSIXACL)
481 seq_printf(s, ",acl");
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
483 seq_printf(s, ",mfsymlinks");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
485 seq_printf(s, ",fsc");
486
487 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
488 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
489 /* convert actimeo and display it in seconds */
490 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
491
492 return 0;
493 }
494
cifs_umount_begin(struct super_block * sb)495 static void cifs_umount_begin(struct super_block *sb)
496 {
497 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
498 struct cifsTconInfo *tcon;
499
500 if (cifs_sb == NULL)
501 return;
502
503 tcon = cifs_sb_master_tcon(cifs_sb);
504
505 spin_lock(&cifs_tcp_ses_lock);
506 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
507 /* we have other mounts to same share or we have
508 already tried to force umount this and woken up
509 all waiting network requests, nothing to do */
510 spin_unlock(&cifs_tcp_ses_lock);
511 return;
512 } else if (tcon->tc_count == 1)
513 tcon->tidStatus = CifsExiting;
514 spin_unlock(&cifs_tcp_ses_lock);
515
516 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
517 /* cancel_notify_requests(tcon); */
518 if (tcon->ses && tcon->ses->server) {
519 cFYI(1, "wake up tasks now - umount begin not complete");
520 wake_up_all(&tcon->ses->server->request_q);
521 wake_up_all(&tcon->ses->server->response_q);
522 msleep(1); /* yield */
523 /* we have to kick the requests once more */
524 wake_up_all(&tcon->ses->server->response_q);
525 msleep(1);
526 }
527
528 return;
529 }
530
531 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct vfsmount * mnt)532 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
533 {
534 /* BB FIXME */
535 return 0;
536 }
537 #endif
538
cifs_remount(struct super_block * sb,int * flags,char * data)539 static int cifs_remount(struct super_block *sb, int *flags, char *data)
540 {
541 *flags |= MS_NODIRATIME;
542 return 0;
543 }
544
cifs_drop_inode(struct inode * inode)545 static int cifs_drop_inode(struct inode *inode)
546 {
547 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
548
549 /* no serverino => unconditional eviction */
550 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
551 generic_drop_inode(inode);
552 }
553
554 static const struct super_operations cifs_super_ops = {
555 .put_super = cifs_put_super,
556 .statfs = cifs_statfs,
557 .alloc_inode = cifs_alloc_inode,
558 .destroy_inode = cifs_destroy_inode,
559 .drop_inode = cifs_drop_inode,
560 .evict_inode = cifs_evict_inode,
561 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
562 function unless later we add lazy close of inodes or unless the
563 kernel forgets to call us with the same number of releases (closes)
564 as opens */
565 .show_options = cifs_show_options,
566 .umount_begin = cifs_umount_begin,
567 .remount_fs = cifs_remount,
568 #ifdef CONFIG_CIFS_STATS2
569 .show_stats = cifs_show_stats,
570 #endif
571 };
572
573 static struct dentry *
cifs_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)574 cifs_do_mount(struct file_system_type *fs_type,
575 int flags, const char *dev_name, void *data)
576 {
577 int rc;
578 struct super_block *sb;
579
580 sb = sget(fs_type, NULL, set_anon_super, NULL);
581
582 cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
583
584 if (IS_ERR(sb))
585 return ERR_CAST(sb);
586
587 sb->s_flags = flags;
588
589 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
590 if (rc) {
591 deactivate_locked_super(sb);
592 return ERR_PTR(rc);
593 }
594 sb->s_flags |= MS_ACTIVE;
595 return dget(sb->s_root);
596 }
597
cifs_file_aio_write(struct kiocb * iocb,const struct iovec * iov,unsigned long nr_segs,loff_t pos)598 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
599 unsigned long nr_segs, loff_t pos)
600 {
601 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
602 ssize_t written;
603 int rc;
604
605 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
606
607 if (CIFS_I(inode)->clientCanCacheAll)
608 return written;
609
610 rc = filemap_fdatawrite(inode->i_mapping);
611 if (rc)
612 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
613
614 return written;
615 }
616
cifs_llseek(struct file * file,loff_t offset,int origin)617 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
618 {
619 /* origin == SEEK_END => we must revalidate the cached file length */
620 if (origin == SEEK_END) {
621 int retval;
622
623 /* some applications poll for the file length in this strange
624 way so we must seek to end on non-oplocked files by
625 setting the revalidate time to zero */
626 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
627
628 retval = cifs_revalidate_file(file);
629 if (retval < 0)
630 return (loff_t)retval;
631 }
632 return generic_file_llseek_unlocked(file, offset, origin);
633 }
634
cifs_setlease(struct file * file,long arg,struct file_lock ** lease)635 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
636 {
637 /* note that this is called by vfs setlease with lock_flocks held
638 to protect *lease from going away */
639 struct inode *inode = file->f_path.dentry->d_inode;
640 struct cifsFileInfo *cfile = file->private_data;
641
642 if (!(S_ISREG(inode->i_mode)))
643 return -EINVAL;
644
645 /* check if file is oplocked */
646 if (((arg == F_RDLCK) &&
647 (CIFS_I(inode)->clientCanCacheRead)) ||
648 ((arg == F_WRLCK) &&
649 (CIFS_I(inode)->clientCanCacheAll)))
650 return generic_setlease(file, arg, lease);
651 else if (tlink_tcon(cfile->tlink)->local_lease &&
652 !CIFS_I(inode)->clientCanCacheRead)
653 /* If the server claims to support oplock on this
654 file, then we still need to check oplock even
655 if the local_lease mount option is set, but there
656 are servers which do not support oplock for which
657 this mount option may be useful if the user
658 knows that the file won't be changed on the server
659 by anyone else */
660 return generic_setlease(file, arg, lease);
661 else
662 return -EAGAIN;
663 }
664
665 struct file_system_type cifs_fs_type = {
666 .owner = THIS_MODULE,
667 .name = "cifs",
668 .mount = cifs_do_mount,
669 .kill_sb = kill_anon_super,
670 /* .fs_flags */
671 };
672 const struct inode_operations cifs_dir_inode_ops = {
673 .create = cifs_create,
674 .lookup = cifs_lookup,
675 .getattr = cifs_getattr,
676 .unlink = cifs_unlink,
677 .link = cifs_hardlink,
678 .mkdir = cifs_mkdir,
679 .rmdir = cifs_rmdir,
680 .rename = cifs_rename,
681 .permission = cifs_permission,
682 /* revalidate:cifs_revalidate, */
683 .setattr = cifs_setattr,
684 .symlink = cifs_symlink,
685 .mknod = cifs_mknod,
686 #ifdef CONFIG_CIFS_XATTR
687 .setxattr = cifs_setxattr,
688 .getxattr = cifs_getxattr,
689 .listxattr = cifs_listxattr,
690 .removexattr = cifs_removexattr,
691 #endif
692 };
693
694 const struct inode_operations cifs_file_inode_ops = {
695 /* revalidate:cifs_revalidate, */
696 .setattr = cifs_setattr,
697 .getattr = cifs_getattr, /* do we need this anymore? */
698 .rename = cifs_rename,
699 .permission = cifs_permission,
700 #ifdef CONFIG_CIFS_XATTR
701 .setxattr = cifs_setxattr,
702 .getxattr = cifs_getxattr,
703 .listxattr = cifs_listxattr,
704 .removexattr = cifs_removexattr,
705 #endif
706 };
707
708 const struct inode_operations cifs_symlink_inode_ops = {
709 .readlink = generic_readlink,
710 .follow_link = cifs_follow_link,
711 .put_link = cifs_put_link,
712 .permission = cifs_permission,
713 /* BB add the following two eventually */
714 /* revalidate: cifs_revalidate,
715 setattr: cifs_notify_change, *//* BB do we need notify change */
716 #ifdef CONFIG_CIFS_XATTR
717 .setxattr = cifs_setxattr,
718 .getxattr = cifs_getxattr,
719 .listxattr = cifs_listxattr,
720 .removexattr = cifs_removexattr,
721 #endif
722 };
723
724 const struct file_operations cifs_file_ops = {
725 .read = do_sync_read,
726 .write = do_sync_write,
727 .aio_read = generic_file_aio_read,
728 .aio_write = cifs_file_aio_write,
729 .open = cifs_open,
730 .release = cifs_close,
731 .lock = cifs_lock,
732 .fsync = cifs_fsync,
733 .flush = cifs_flush,
734 .mmap = cifs_file_mmap,
735 .splice_read = generic_file_splice_read,
736 .llseek = cifs_llseek,
737 #ifdef CONFIG_CIFS_POSIX
738 .unlocked_ioctl = cifs_ioctl,
739 #endif /* CONFIG_CIFS_POSIX */
740 .setlease = cifs_setlease,
741 };
742
743 const struct file_operations cifs_file_strict_ops = {
744 .read = do_sync_read,
745 .write = do_sync_write,
746 .aio_read = cifs_strict_readv,
747 .aio_write = cifs_strict_writev,
748 .open = cifs_open,
749 .release = cifs_close,
750 .lock = cifs_lock,
751 .fsync = cifs_strict_fsync,
752 .flush = cifs_flush,
753 .mmap = cifs_file_strict_mmap,
754 .splice_read = generic_file_splice_read,
755 .llseek = cifs_llseek,
756 #ifdef CONFIG_CIFS_POSIX
757 .unlocked_ioctl = cifs_ioctl,
758 #endif /* CONFIG_CIFS_POSIX */
759 .setlease = cifs_setlease,
760 };
761
762 const struct file_operations cifs_file_direct_ops = {
763 /* no aio, no readv -
764 BB reevaluate whether they can be done with directio, no cache */
765 .read = cifs_user_read,
766 .write = cifs_user_write,
767 .open = cifs_open,
768 .release = cifs_close,
769 .lock = cifs_lock,
770 .fsync = cifs_fsync,
771 .flush = cifs_flush,
772 .mmap = cifs_file_mmap,
773 .splice_read = generic_file_splice_read,
774 #ifdef CONFIG_CIFS_POSIX
775 .unlocked_ioctl = cifs_ioctl,
776 #endif /* CONFIG_CIFS_POSIX */
777 .llseek = cifs_llseek,
778 .setlease = cifs_setlease,
779 };
780
781 const struct file_operations cifs_file_nobrl_ops = {
782 .read = do_sync_read,
783 .write = do_sync_write,
784 .aio_read = generic_file_aio_read,
785 .aio_write = cifs_file_aio_write,
786 .open = cifs_open,
787 .release = cifs_close,
788 .fsync = cifs_fsync,
789 .flush = cifs_flush,
790 .mmap = cifs_file_mmap,
791 .splice_read = generic_file_splice_read,
792 .llseek = cifs_llseek,
793 #ifdef CONFIG_CIFS_POSIX
794 .unlocked_ioctl = cifs_ioctl,
795 #endif /* CONFIG_CIFS_POSIX */
796 .setlease = cifs_setlease,
797 };
798
799 const struct file_operations cifs_file_strict_nobrl_ops = {
800 .read = do_sync_read,
801 .write = do_sync_write,
802 .aio_read = cifs_strict_readv,
803 .aio_write = cifs_strict_writev,
804 .open = cifs_open,
805 .release = cifs_close,
806 .fsync = cifs_strict_fsync,
807 .flush = cifs_flush,
808 .mmap = cifs_file_strict_mmap,
809 .splice_read = generic_file_splice_read,
810 .llseek = cifs_llseek,
811 #ifdef CONFIG_CIFS_POSIX
812 .unlocked_ioctl = cifs_ioctl,
813 #endif /* CONFIG_CIFS_POSIX */
814 .setlease = cifs_setlease,
815 };
816
817 const struct file_operations cifs_file_direct_nobrl_ops = {
818 /* no mmap, no aio, no readv -
819 BB reevaluate whether they can be done with directio, no cache */
820 .read = cifs_user_read,
821 .write = cifs_user_write,
822 .open = cifs_open,
823 .release = cifs_close,
824 .fsync = cifs_fsync,
825 .flush = cifs_flush,
826 .mmap = cifs_file_mmap,
827 .splice_read = generic_file_splice_read,
828 #ifdef CONFIG_CIFS_POSIX
829 .unlocked_ioctl = cifs_ioctl,
830 #endif /* CONFIG_CIFS_POSIX */
831 .llseek = cifs_llseek,
832 .setlease = cifs_setlease,
833 };
834
835 const struct file_operations cifs_dir_ops = {
836 .readdir = cifs_readdir,
837 .release = cifs_closedir,
838 .read = generic_read_dir,
839 .unlocked_ioctl = cifs_ioctl,
840 .llseek = generic_file_llseek,
841 };
842
843 static void
cifs_init_once(void * inode)844 cifs_init_once(void *inode)
845 {
846 struct cifsInodeInfo *cifsi = inode;
847
848 inode_init_once(&cifsi->vfs_inode);
849 INIT_LIST_HEAD(&cifsi->lockList);
850 }
851
852 static int
cifs_init_inodecache(void)853 cifs_init_inodecache(void)
854 {
855 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
856 sizeof(struct cifsInodeInfo),
857 0, (SLAB_RECLAIM_ACCOUNT|
858 SLAB_MEM_SPREAD),
859 cifs_init_once);
860 if (cifs_inode_cachep == NULL)
861 return -ENOMEM;
862
863 return 0;
864 }
865
866 static void
cifs_destroy_inodecache(void)867 cifs_destroy_inodecache(void)
868 {
869 kmem_cache_destroy(cifs_inode_cachep);
870 }
871
872 static int
cifs_init_request_bufs(void)873 cifs_init_request_bufs(void)
874 {
875 if (CIFSMaxBufSize < 8192) {
876 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
877 Unicode path name has to fit in any SMB/CIFS path based frames */
878 CIFSMaxBufSize = 8192;
879 } else if (CIFSMaxBufSize > 1024*127) {
880 CIFSMaxBufSize = 1024 * 127;
881 } else {
882 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
883 }
884 /* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
885 cifs_req_cachep = kmem_cache_create("cifs_request",
886 CIFSMaxBufSize +
887 MAX_CIFS_HDR_SIZE, 0,
888 SLAB_HWCACHE_ALIGN, NULL);
889 if (cifs_req_cachep == NULL)
890 return -ENOMEM;
891
892 if (cifs_min_rcv < 1)
893 cifs_min_rcv = 1;
894 else if (cifs_min_rcv > 64) {
895 cifs_min_rcv = 64;
896 cERROR(1, "cifs_min_rcv set to maximum (64)");
897 }
898
899 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
900 cifs_req_cachep);
901
902 if (cifs_req_poolp == NULL) {
903 kmem_cache_destroy(cifs_req_cachep);
904 return -ENOMEM;
905 }
906 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
907 almost all handle based requests (but not write response, nor is it
908 sufficient for path based requests). A smaller size would have
909 been more efficient (compacting multiple slab items on one 4k page)
910 for the case in which debug was on, but this larger size allows
911 more SMBs to use small buffer alloc and is still much more
912 efficient to alloc 1 per page off the slab compared to 17K (5page)
913 alloc of large cifs buffers even when page debugging is on */
914 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
915 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
916 NULL);
917 if (cifs_sm_req_cachep == NULL) {
918 mempool_destroy(cifs_req_poolp);
919 kmem_cache_destroy(cifs_req_cachep);
920 return -ENOMEM;
921 }
922
923 if (cifs_min_small < 2)
924 cifs_min_small = 2;
925 else if (cifs_min_small > 256) {
926 cifs_min_small = 256;
927 cFYI(1, "cifs_min_small set to maximum (256)");
928 }
929
930 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
931 cifs_sm_req_cachep);
932
933 if (cifs_sm_req_poolp == NULL) {
934 mempool_destroy(cifs_req_poolp);
935 kmem_cache_destroy(cifs_req_cachep);
936 kmem_cache_destroy(cifs_sm_req_cachep);
937 return -ENOMEM;
938 }
939
940 return 0;
941 }
942
943 static void
cifs_destroy_request_bufs(void)944 cifs_destroy_request_bufs(void)
945 {
946 mempool_destroy(cifs_req_poolp);
947 kmem_cache_destroy(cifs_req_cachep);
948 mempool_destroy(cifs_sm_req_poolp);
949 kmem_cache_destroy(cifs_sm_req_cachep);
950 }
951
952 static int
cifs_init_mids(void)953 cifs_init_mids(void)
954 {
955 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
956 sizeof(struct mid_q_entry), 0,
957 SLAB_HWCACHE_ALIGN, NULL);
958 if (cifs_mid_cachep == NULL)
959 return -ENOMEM;
960
961 /* 3 is a reasonable minimum number of simultaneous operations */
962 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
963 if (cifs_mid_poolp == NULL) {
964 kmem_cache_destroy(cifs_mid_cachep);
965 return -ENOMEM;
966 }
967
968 return 0;
969 }
970
971 static void
cifs_destroy_mids(void)972 cifs_destroy_mids(void)
973 {
974 mempool_destroy(cifs_mid_poolp);
975 kmem_cache_destroy(cifs_mid_cachep);
976 }
977
978 static int __init
init_cifs(void)979 init_cifs(void)
980 {
981 int rc = 0;
982 cifs_proc_init();
983 INIT_LIST_HEAD(&cifs_tcp_ses_list);
984 #ifdef CONFIG_CIFS_EXPERIMENTAL
985 INIT_LIST_HEAD(&GlobalDnotifyReqList);
986 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
987 #endif
988 /*
989 * Initialize Global counters
990 */
991 atomic_set(&sesInfoAllocCount, 0);
992 atomic_set(&tconInfoAllocCount, 0);
993 atomic_set(&tcpSesAllocCount, 0);
994 atomic_set(&tcpSesReconnectCount, 0);
995 atomic_set(&tconInfoReconnectCount, 0);
996
997 atomic_set(&bufAllocCount, 0);
998 atomic_set(&smBufAllocCount, 0);
999 #ifdef CONFIG_CIFS_STATS2
1000 atomic_set(&totBufAllocCount, 0);
1001 atomic_set(&totSmBufAllocCount, 0);
1002 #endif /* CONFIG_CIFS_STATS2 */
1003
1004 atomic_set(&midCount, 0);
1005 GlobalCurrentXid = 0;
1006 GlobalTotalActiveXid = 0;
1007 GlobalMaxActiveXid = 0;
1008 spin_lock_init(&cifs_tcp_ses_lock);
1009 spin_lock_init(&cifs_file_list_lock);
1010 spin_lock_init(&GlobalMid_Lock);
1011
1012 if (cifs_max_pending < 2) {
1013 cifs_max_pending = 2;
1014 cFYI(1, "cifs_max_pending set to min of 2");
1015 } else if (cifs_max_pending > 256) {
1016 cifs_max_pending = 256;
1017 cFYI(1, "cifs_max_pending set to max of 256");
1018 }
1019
1020 rc = cifs_fscache_register();
1021 if (rc)
1022 goto out_clean_proc;
1023
1024 rc = cifs_init_inodecache();
1025 if (rc)
1026 goto out_unreg_fscache;
1027
1028 rc = cifs_init_mids();
1029 if (rc)
1030 goto out_destroy_inodecache;
1031
1032 rc = cifs_init_request_bufs();
1033 if (rc)
1034 goto out_destroy_mids;
1035
1036 rc = register_filesystem(&cifs_fs_type);
1037 if (rc)
1038 goto out_destroy_request_bufs;
1039 #ifdef CONFIG_CIFS_UPCALL
1040 rc = register_key_type(&cifs_spnego_key_type);
1041 if (rc)
1042 goto out_unregister_filesystem;
1043 #endif
1044
1045 return 0;
1046
1047 #ifdef CONFIG_CIFS_UPCALL
1048 out_unregister_filesystem:
1049 unregister_filesystem(&cifs_fs_type);
1050 #endif
1051 out_destroy_request_bufs:
1052 cifs_destroy_request_bufs();
1053 out_destroy_mids:
1054 cifs_destroy_mids();
1055 out_destroy_inodecache:
1056 cifs_destroy_inodecache();
1057 out_unreg_fscache:
1058 cifs_fscache_unregister();
1059 out_clean_proc:
1060 cifs_proc_clean();
1061 return rc;
1062 }
1063
1064 static void __exit
exit_cifs(void)1065 exit_cifs(void)
1066 {
1067 cFYI(DBG2, "exit_cifs");
1068 cifs_proc_clean();
1069 cifs_fscache_unregister();
1070 #ifdef CONFIG_CIFS_DFS_UPCALL
1071 cifs_dfs_release_automount_timer();
1072 #endif
1073 #ifdef CONFIG_CIFS_UPCALL
1074 unregister_key_type(&cifs_spnego_key_type);
1075 #endif
1076 unregister_filesystem(&cifs_fs_type);
1077 cifs_destroy_inodecache();
1078 cifs_destroy_mids();
1079 cifs_destroy_request_bufs();
1080 }
1081
1082 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1083 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1084 MODULE_DESCRIPTION
1085 ("VFS to access servers complying with the SNIA CIFS Specification "
1086 "e.g. Samba and Windows");
1087 MODULE_VERSION(CIFS_VERSION);
1088 module_init(init_cifs)
1089 module_exit(exit_cifs)
1090