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 <linux/namei.h>
39 #include <linux/random.h>
40 #include <net/ipv6.h>
41 #include "cifsfs.h"
42 #include "cifspdu.h"
43 #define DECLARE_GLOBALS_HERE
44 #include "cifsglob.h"
45 #include "cifsproto.h"
46 #include "cifs_debug.h"
47 #include "cifs_fs_sb.h"
48 #include <linux/mm.h>
49 #include <linux/key-type.h>
50 #include "cifs_spnego.h"
51 #include "fscache.h"
52 #ifdef CONFIG_CIFS_SMB2
53 #include "smb2pdu.h"
54 #endif
55
56 int cifsFYI = 0;
57 int traceSMB = 0;
58 bool enable_oplocks = true;
59 unsigned int linuxExtEnabled = 1;
60 unsigned int lookupCacheEnabled = 1;
61 unsigned int global_secflags = CIFSSEC_DEF;
62 /* unsigned int ntlmv2_support = 0; */
63 unsigned int sign_CIFS_PDUs = 1;
64 static const struct super_operations cifs_super_ops;
65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
66 module_param(CIFSMaxBufSize, uint, 0);
67 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
68 "Default: 16384 Range: 8192 to 130048");
69 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
70 module_param(cifs_min_rcv, uint, 0);
71 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
72 "1 to 64");
73 unsigned int cifs_min_small = 30;
74 module_param(cifs_min_small, uint, 0);
75 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
76 "Range: 2 to 256");
77 unsigned int cifs_max_pending = CIFS_MAX_REQ;
78 module_param(cifs_max_pending, uint, 0444);
79 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
80 "Default: 32767 Range: 2 to 32767.");
81 module_param(enable_oplocks, bool, 0644);
82 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
83
84 extern mempool_t *cifs_sm_req_poolp;
85 extern mempool_t *cifs_req_poolp;
86 extern mempool_t *cifs_mid_poolp;
87
88 struct workqueue_struct *cifsiod_wq;
89
90 #ifdef CONFIG_CIFS_SMB2
91 __u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
92 #endif
93
94 /*
95 * Bumps refcount for cifs super block.
96 * Note that it should be only called if a referece to VFS super block is
97 * already held, e.g. in open-type syscalls context. Otherwise it can race with
98 * atomic_dec_and_test in deactivate_locked_super.
99 */
100 void
cifs_sb_active(struct super_block * sb)101 cifs_sb_active(struct super_block *sb)
102 {
103 struct cifs_sb_info *server = CIFS_SB(sb);
104
105 if (atomic_inc_return(&server->active) == 1)
106 atomic_inc(&sb->s_active);
107 }
108
109 void
cifs_sb_deactive(struct super_block * sb)110 cifs_sb_deactive(struct super_block *sb)
111 {
112 struct cifs_sb_info *server = CIFS_SB(sb);
113
114 if (atomic_dec_and_test(&server->active))
115 deactivate_super(sb);
116 }
117
118 static int
cifs_read_super(struct super_block * sb)119 cifs_read_super(struct super_block *sb)
120 {
121 struct inode *inode;
122 struct cifs_sb_info *cifs_sb;
123 int rc = 0;
124
125 cifs_sb = CIFS_SB(sb);
126
127 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
128 sb->s_flags |= MS_POSIXACL;
129
130 if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
131 sb->s_maxbytes = MAX_LFS_FILESIZE;
132 else
133 sb->s_maxbytes = MAX_NON_LFS;
134
135 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
136 sb->s_time_gran = 100;
137
138 sb->s_magic = CIFS_MAGIC_NUMBER;
139 sb->s_op = &cifs_super_ops;
140 sb->s_bdi = &cifs_sb->bdi;
141 sb->s_blocksize = CIFS_MAX_MSGSIZE;
142 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
143 inode = cifs_root_iget(sb);
144
145 if (IS_ERR(inode)) {
146 rc = PTR_ERR(inode);
147 goto out_no_root;
148 }
149
150 sb->s_root = d_make_root(inode);
151 if (!sb->s_root) {
152 rc = -ENOMEM;
153 goto out_no_root;
154 }
155
156 /* do that *after* d_make_root() - we want NULL ->d_op for root here */
157 if (cifs_sb_master_tcon(cifs_sb)->nocase)
158 sb->s_d_op = &cifs_ci_dentry_ops;
159 else
160 sb->s_d_op = &cifs_dentry_ops;
161
162 #ifdef CONFIG_CIFS_NFSD_EXPORT
163 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
164 cifs_dbg(FYI, "export ops supported\n");
165 sb->s_export_op = &cifs_export_ops;
166 }
167 #endif /* CONFIG_CIFS_NFSD_EXPORT */
168
169 return 0;
170
171 out_no_root:
172 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
173 return rc;
174 }
175
cifs_kill_sb(struct super_block * sb)176 static void cifs_kill_sb(struct super_block *sb)
177 {
178 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
179 kill_anon_super(sb);
180 cifs_umount(cifs_sb);
181 }
182
183 static int
cifs_statfs(struct dentry * dentry,struct kstatfs * buf)184 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
185 {
186 struct super_block *sb = dentry->d_sb;
187 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
188 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
189 struct TCP_Server_Info *server = tcon->ses->server;
190 unsigned int xid;
191 int rc = 0;
192
193 xid = get_xid();
194
195 /*
196 * PATH_MAX may be too long - it would presumably be total path,
197 * but note that some servers (includinng Samba 3) have a shorter
198 * maximum path.
199 *
200 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
201 */
202 buf->f_namelen = PATH_MAX;
203 buf->f_files = 0; /* undefined */
204 buf->f_ffree = 0; /* unlimited */
205
206 if (server->ops->queryfs)
207 rc = server->ops->queryfs(xid, tcon, buf);
208
209 free_xid(xid);
210 return 0;
211 }
212
cifs_permission(struct inode * inode,int mask)213 static int cifs_permission(struct inode *inode, int mask)
214 {
215 struct cifs_sb_info *cifs_sb;
216
217 cifs_sb = CIFS_SB(inode->i_sb);
218
219 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
220 if ((mask & MAY_EXEC) && !execute_ok(inode))
221 return -EACCES;
222 else
223 return 0;
224 } else /* file mode might have been restricted at mount time
225 on the client (above and beyond ACL on servers) for
226 servers which do not support setting and viewing mode bits,
227 so allowing client to check permissions is useful */
228 return generic_permission(inode, mask);
229 }
230
231 static struct kmem_cache *cifs_inode_cachep;
232 static struct kmem_cache *cifs_req_cachep;
233 static struct kmem_cache *cifs_mid_cachep;
234 static struct kmem_cache *cifs_sm_req_cachep;
235 mempool_t *cifs_sm_req_poolp;
236 mempool_t *cifs_req_poolp;
237 mempool_t *cifs_mid_poolp;
238
239 static struct inode *
cifs_alloc_inode(struct super_block * sb)240 cifs_alloc_inode(struct super_block *sb)
241 {
242 struct cifsInodeInfo *cifs_inode;
243 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
244 if (!cifs_inode)
245 return NULL;
246 cifs_inode->cifsAttrs = 0x20; /* default */
247 cifs_inode->time = 0;
248 /*
249 * Until the file is open and we have gotten oplock info back from the
250 * server, can not assume caching of file data or metadata.
251 */
252 cifs_set_oplock_level(cifs_inode, 0);
253 cifs_inode->delete_pending = false;
254 cifs_inode->invalid_mapping = false;
255 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
256 cifs_inode->server_eof = 0;
257 cifs_inode->uniqueid = 0;
258 cifs_inode->createtime = 0;
259 #ifdef CONFIG_CIFS_SMB2
260 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
261 #endif
262 /*
263 * Can not set i_flags here - they get immediately overwritten to zero
264 * by the VFS.
265 */
266 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
267 INIT_LIST_HEAD(&cifs_inode->openFileList);
268 INIT_LIST_HEAD(&cifs_inode->llist);
269 return &cifs_inode->vfs_inode;
270 }
271
cifs_i_callback(struct rcu_head * head)272 static void cifs_i_callback(struct rcu_head *head)
273 {
274 struct inode *inode = container_of(head, struct inode, i_rcu);
275 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
276 }
277
278 static void
cifs_destroy_inode(struct inode * inode)279 cifs_destroy_inode(struct inode *inode)
280 {
281 call_rcu(&inode->i_rcu, cifs_i_callback);
282 }
283
284 static void
cifs_evict_inode(struct inode * inode)285 cifs_evict_inode(struct inode *inode)
286 {
287 truncate_inode_pages(&inode->i_data, 0);
288 clear_inode(inode);
289 cifs_fscache_release_inode_cookie(inode);
290 }
291
292 static void
cifs_show_address(struct seq_file * s,struct TCP_Server_Info * server)293 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
294 {
295 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
296 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
297
298 seq_printf(s, ",addr=");
299
300 switch (server->dstaddr.ss_family) {
301 case AF_INET:
302 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
303 break;
304 case AF_INET6:
305 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
306 if (sa6->sin6_scope_id)
307 seq_printf(s, "%%%u", sa6->sin6_scope_id);
308 break;
309 default:
310 seq_printf(s, "(unknown)");
311 }
312 }
313
314 static void
cifs_show_security(struct seq_file * s,struct TCP_Server_Info * server)315 cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
316 {
317 seq_printf(s, ",sec=");
318
319 switch (server->secType) {
320 case LANMAN:
321 seq_printf(s, "lanman");
322 break;
323 case NTLMv2:
324 seq_printf(s, "ntlmv2");
325 break;
326 case NTLM:
327 seq_printf(s, "ntlm");
328 break;
329 case Kerberos:
330 seq_printf(s, "krb5");
331 break;
332 case RawNTLMSSP:
333 seq_printf(s, "ntlmssp");
334 break;
335 default:
336 /* shouldn't ever happen */
337 seq_printf(s, "unknown");
338 break;
339 }
340
341 if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
342 seq_printf(s, "i");
343 }
344
345 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)346 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
347 {
348 seq_printf(s, ",cache=");
349
350 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
351 seq_printf(s, "strict");
352 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
353 seq_printf(s, "none");
354 else
355 seq_printf(s, "loose");
356 }
357
358 /*
359 * cifs_show_options() is for displaying mount options in /proc/mounts.
360 * Not all settable options are displayed but most of the important
361 * ones are.
362 */
363 static int
cifs_show_options(struct seq_file * s,struct dentry * root)364 cifs_show_options(struct seq_file *s, struct dentry *root)
365 {
366 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
367 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
368 struct sockaddr *srcaddr;
369 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
370
371 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
372 cifs_show_security(s, tcon->ses->server);
373 cifs_show_cache_flavor(s, cifs_sb);
374
375 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
376 seq_printf(s, ",multiuser");
377 else if (tcon->ses->user_name)
378 seq_printf(s, ",username=%s", tcon->ses->user_name);
379
380 if (tcon->ses->domainName)
381 seq_printf(s, ",domain=%s", tcon->ses->domainName);
382
383 if (srcaddr->sa_family != AF_UNSPEC) {
384 struct sockaddr_in *saddr4;
385 struct sockaddr_in6 *saddr6;
386 saddr4 = (struct sockaddr_in *)srcaddr;
387 saddr6 = (struct sockaddr_in6 *)srcaddr;
388 if (srcaddr->sa_family == AF_INET6)
389 seq_printf(s, ",srcaddr=%pI6c",
390 &saddr6->sin6_addr);
391 else if (srcaddr->sa_family == AF_INET)
392 seq_printf(s, ",srcaddr=%pI4",
393 &saddr4->sin_addr.s_addr);
394 else
395 seq_printf(s, ",srcaddr=BAD-AF:%i",
396 (int)(srcaddr->sa_family));
397 }
398
399 seq_printf(s, ",uid=%u",
400 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
401 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
402 seq_printf(s, ",forceuid");
403 else
404 seq_printf(s, ",noforceuid");
405
406 seq_printf(s, ",gid=%u",
407 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
408 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
409 seq_printf(s, ",forcegid");
410 else
411 seq_printf(s, ",noforcegid");
412
413 cifs_show_address(s, tcon->ses->server);
414
415 if (!tcon->unix_ext)
416 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
417 cifs_sb->mnt_file_mode,
418 cifs_sb->mnt_dir_mode);
419 if (tcon->seal)
420 seq_printf(s, ",seal");
421 if (tcon->nocase)
422 seq_printf(s, ",nocase");
423 if (tcon->retry)
424 seq_printf(s, ",hard");
425 if (tcon->unix_ext)
426 seq_printf(s, ",unix");
427 else
428 seq_printf(s, ",nounix");
429 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
430 seq_printf(s, ",posixpaths");
431 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
432 seq_printf(s, ",setuids");
433 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
434 seq_printf(s, ",serverino");
435 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
436 seq_printf(s, ",rwpidforward");
437 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
438 seq_printf(s, ",forcemand");
439 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
440 seq_printf(s, ",nouser_xattr");
441 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
442 seq_printf(s, ",mapchars");
443 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
444 seq_printf(s, ",sfu");
445 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
446 seq_printf(s, ",nobrl");
447 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
448 seq_printf(s, ",cifsacl");
449 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
450 seq_printf(s, ",dynperm");
451 if (root->d_sb->s_flags & MS_POSIXACL)
452 seq_printf(s, ",acl");
453 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
454 seq_printf(s, ",mfsymlinks");
455 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
456 seq_printf(s, ",fsc");
457 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
458 seq_printf(s, ",nostrictsync");
459 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
460 seq_printf(s, ",noperm");
461 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
462 seq_printf(s, ",backupuid=%u",
463 from_kuid_munged(&init_user_ns,
464 cifs_sb->mnt_backupuid));
465 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
466 seq_printf(s, ",backupgid=%u",
467 from_kgid_munged(&init_user_ns,
468 cifs_sb->mnt_backupgid));
469
470 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
471 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
472 /* convert actimeo and display it in seconds */
473 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
474
475 return 0;
476 }
477
cifs_umount_begin(struct super_block * sb)478 static void cifs_umount_begin(struct super_block *sb)
479 {
480 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
481 struct cifs_tcon *tcon;
482
483 if (cifs_sb == NULL)
484 return;
485
486 tcon = cifs_sb_master_tcon(cifs_sb);
487
488 spin_lock(&cifs_tcp_ses_lock);
489 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
490 /* we have other mounts to same share or we have
491 already tried to force umount this and woken up
492 all waiting network requests, nothing to do */
493 spin_unlock(&cifs_tcp_ses_lock);
494 return;
495 } else if (tcon->tc_count == 1)
496 tcon->tidStatus = CifsExiting;
497 spin_unlock(&cifs_tcp_ses_lock);
498
499 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
500 /* cancel_notify_requests(tcon); */
501 if (tcon->ses && tcon->ses->server) {
502 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
503 wake_up_all(&tcon->ses->server->request_q);
504 wake_up_all(&tcon->ses->server->response_q);
505 msleep(1); /* yield */
506 /* we have to kick the requests once more */
507 wake_up_all(&tcon->ses->server->response_q);
508 msleep(1);
509 }
510
511 return;
512 }
513
514 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)515 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
516 {
517 /* BB FIXME */
518 return 0;
519 }
520 #endif
521
cifs_remount(struct super_block * sb,int * flags,char * data)522 static int cifs_remount(struct super_block *sb, int *flags, char *data)
523 {
524 sync_filesystem(sb);
525 *flags |= MS_NODIRATIME;
526 return 0;
527 }
528
cifs_drop_inode(struct inode * inode)529 static int cifs_drop_inode(struct inode *inode)
530 {
531 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
532
533 /* no serverino => unconditional eviction */
534 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
535 generic_drop_inode(inode);
536 }
537
538 static const struct super_operations cifs_super_ops = {
539 .statfs = cifs_statfs,
540 .alloc_inode = cifs_alloc_inode,
541 .destroy_inode = cifs_destroy_inode,
542 .drop_inode = cifs_drop_inode,
543 .evict_inode = cifs_evict_inode,
544 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
545 function unless later we add lazy close of inodes or unless the
546 kernel forgets to call us with the same number of releases (closes)
547 as opens */
548 .show_options = cifs_show_options,
549 .umount_begin = cifs_umount_begin,
550 .remount_fs = cifs_remount,
551 #ifdef CONFIG_CIFS_STATS2
552 .show_stats = cifs_show_stats,
553 #endif
554 };
555
556 /*
557 * Get root dentry from superblock according to prefix path mount option.
558 * Return dentry with refcount + 1 on success and NULL otherwise.
559 */
560 static struct dentry *
cifs_get_root(struct smb_vol * vol,struct super_block * sb)561 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
562 {
563 struct dentry *dentry;
564 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
565 char *full_path = NULL;
566 char *s, *p;
567 char sep;
568
569 full_path = cifs_build_path_to_root(vol, cifs_sb,
570 cifs_sb_master_tcon(cifs_sb));
571 if (full_path == NULL)
572 return ERR_PTR(-ENOMEM);
573
574 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
575
576 sep = CIFS_DIR_SEP(cifs_sb);
577 dentry = dget(sb->s_root);
578 p = s = full_path;
579
580 do {
581 struct inode *dir = dentry->d_inode;
582 struct dentry *child;
583
584 if (!dir) {
585 dput(dentry);
586 dentry = ERR_PTR(-ENOENT);
587 break;
588 }
589 if (!S_ISDIR(dir->i_mode)) {
590 dput(dentry);
591 dentry = ERR_PTR(-ENOTDIR);
592 break;
593 }
594
595 /* skip separators */
596 while (*s == sep)
597 s++;
598 if (!*s)
599 break;
600 p = s++;
601 /* next separator */
602 while (*s && *s != sep)
603 s++;
604
605 mutex_lock(&dir->i_mutex);
606 child = lookup_one_len(p, dentry, s - p);
607 mutex_unlock(&dir->i_mutex);
608 dput(dentry);
609 dentry = child;
610 } while (!IS_ERR(dentry));
611 kfree(full_path);
612 return dentry;
613 }
614
cifs_set_super(struct super_block * sb,void * data)615 static int cifs_set_super(struct super_block *sb, void *data)
616 {
617 struct cifs_mnt_data *mnt_data = data;
618 sb->s_fs_info = mnt_data->cifs_sb;
619 return set_anon_super(sb, NULL);
620 }
621
622 static struct dentry *
cifs_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)623 cifs_do_mount(struct file_system_type *fs_type,
624 int flags, const char *dev_name, void *data)
625 {
626 int rc;
627 struct super_block *sb;
628 struct cifs_sb_info *cifs_sb;
629 struct smb_vol *volume_info;
630 struct cifs_mnt_data mnt_data;
631 struct dentry *root;
632
633 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
634
635 volume_info = cifs_get_volume_info((char *)data, dev_name);
636 if (IS_ERR(volume_info))
637 return ERR_CAST(volume_info);
638
639 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
640 if (cifs_sb == NULL) {
641 root = ERR_PTR(-ENOMEM);
642 goto out_nls;
643 }
644
645 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
646 if (cifs_sb->mountdata == NULL) {
647 root = ERR_PTR(-ENOMEM);
648 goto out_cifs_sb;
649 }
650
651 cifs_setup_cifs_sb(volume_info, cifs_sb);
652
653 rc = cifs_mount(cifs_sb, volume_info);
654 if (rc) {
655 if (!(flags & MS_SILENT))
656 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
657 rc);
658 root = ERR_PTR(rc);
659 goto out_mountdata;
660 }
661
662 mnt_data.vol = volume_info;
663 mnt_data.cifs_sb = cifs_sb;
664 mnt_data.flags = flags;
665
666 /* BB should we make this contingent on mount parm? */
667 flags |= MS_NODIRATIME | MS_NOATIME;
668
669 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
670 if (IS_ERR(sb)) {
671 root = ERR_CAST(sb);
672 cifs_umount(cifs_sb);
673 goto out;
674 }
675
676 if (sb->s_root) {
677 cifs_dbg(FYI, "Use existing superblock\n");
678 cifs_umount(cifs_sb);
679 } else {
680 rc = cifs_read_super(sb);
681 if (rc) {
682 root = ERR_PTR(rc);
683 goto out_super;
684 }
685
686 sb->s_flags |= MS_ACTIVE;
687 }
688
689 root = cifs_get_root(volume_info, sb);
690 if (IS_ERR(root))
691 goto out_super;
692
693 cifs_dbg(FYI, "dentry root is: %p\n", root);
694 goto out;
695
696 out_super:
697 deactivate_locked_super(sb);
698 out:
699 cifs_cleanup_volume_info(volume_info);
700 return root;
701
702 out_mountdata:
703 kfree(cifs_sb->mountdata);
704 out_cifs_sb:
705 kfree(cifs_sb);
706 out_nls:
707 unload_nls(volume_info->local_nls);
708 goto out;
709 }
710
cifs_file_aio_write(struct kiocb * iocb,const struct iovec * iov,unsigned long nr_segs,loff_t pos)711 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
712 unsigned long nr_segs, loff_t pos)
713 {
714 struct inode *inode = file_inode(iocb->ki_filp);
715 ssize_t written;
716 int rc;
717
718 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
719
720 if (CIFS_I(inode)->clientCanCacheAll)
721 return written;
722
723 rc = filemap_fdatawrite(inode->i_mapping);
724 if (rc)
725 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
726 rc, inode);
727
728 return written;
729 }
730
cifs_llseek(struct file * file,loff_t offset,int whence)731 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
732 {
733 /*
734 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
735 * the cached file length
736 */
737 if (whence != SEEK_SET && whence != SEEK_CUR) {
738 int rc;
739 struct inode *inode = file_inode(file);
740
741 /*
742 * We need to be sure that all dirty pages are written and the
743 * server has the newest file length.
744 */
745 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
746 inode->i_mapping->nrpages != 0) {
747 rc = filemap_fdatawait(inode->i_mapping);
748 if (rc) {
749 mapping_set_error(inode->i_mapping, rc);
750 return rc;
751 }
752 }
753 /*
754 * Some applications poll for the file length in this strange
755 * way so we must seek to end on non-oplocked files by
756 * setting the revalidate time to zero.
757 */
758 CIFS_I(inode)->time = 0;
759
760 rc = cifs_revalidate_file_attr(file);
761 if (rc < 0)
762 return (loff_t)rc;
763 }
764 return generic_file_llseek(file, offset, whence);
765 }
766
cifs_setlease(struct file * file,long arg,struct file_lock ** lease)767 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
768 {
769 /* note that this is called by vfs setlease with lock_flocks held
770 to protect *lease from going away */
771 struct inode *inode = file_inode(file);
772 struct cifsFileInfo *cfile = file->private_data;
773
774 if (!(S_ISREG(inode->i_mode)))
775 return -EINVAL;
776
777 /* check if file is oplocked */
778 if (((arg == F_RDLCK) &&
779 (CIFS_I(inode)->clientCanCacheRead)) ||
780 ((arg == F_WRLCK) &&
781 (CIFS_I(inode)->clientCanCacheAll)))
782 return generic_setlease(file, arg, lease);
783 else if (tlink_tcon(cfile->tlink)->local_lease &&
784 !CIFS_I(inode)->clientCanCacheRead)
785 /* If the server claims to support oplock on this
786 file, then we still need to check oplock even
787 if the local_lease mount option is set, but there
788 are servers which do not support oplock for which
789 this mount option may be useful if the user
790 knows that the file won't be changed on the server
791 by anyone else */
792 return generic_setlease(file, arg, lease);
793 else
794 return -EAGAIN;
795 }
796
797 struct file_system_type cifs_fs_type = {
798 .owner = THIS_MODULE,
799 .name = "cifs",
800 .mount = cifs_do_mount,
801 .kill_sb = cifs_kill_sb,
802 /* .fs_flags */
803 };
804 MODULE_ALIAS_FS("cifs");
805 const struct inode_operations cifs_dir_inode_ops = {
806 .create = cifs_create,
807 .atomic_open = cifs_atomic_open,
808 .lookup = cifs_lookup,
809 .getattr = cifs_getattr,
810 .unlink = cifs_unlink,
811 .link = cifs_hardlink,
812 .mkdir = cifs_mkdir,
813 .rmdir = cifs_rmdir,
814 .rename = cifs_rename,
815 .permission = cifs_permission,
816 /* revalidate:cifs_revalidate, */
817 .setattr = cifs_setattr,
818 .symlink = cifs_symlink,
819 .mknod = cifs_mknod,
820 #ifdef CONFIG_CIFS_XATTR
821 .setxattr = cifs_setxattr,
822 .getxattr = cifs_getxattr,
823 .listxattr = cifs_listxattr,
824 .removexattr = cifs_removexattr,
825 #endif
826 };
827
828 const struct inode_operations cifs_file_inode_ops = {
829 /* revalidate:cifs_revalidate, */
830 .setattr = cifs_setattr,
831 .getattr = cifs_getattr, /* do we need this anymore? */
832 .rename = cifs_rename,
833 .permission = cifs_permission,
834 #ifdef CONFIG_CIFS_XATTR
835 .setxattr = cifs_setxattr,
836 .getxattr = cifs_getxattr,
837 .listxattr = cifs_listxattr,
838 .removexattr = cifs_removexattr,
839 #endif
840 };
841
842 const struct inode_operations cifs_symlink_inode_ops = {
843 .readlink = generic_readlink,
844 .follow_link = cifs_follow_link,
845 .put_link = cifs_put_link,
846 .permission = cifs_permission,
847 /* BB add the following two eventually */
848 /* revalidate: cifs_revalidate,
849 setattr: cifs_notify_change, *//* BB do we need notify change */
850 #ifdef CONFIG_CIFS_XATTR
851 .setxattr = cifs_setxattr,
852 .getxattr = cifs_getxattr,
853 .listxattr = cifs_listxattr,
854 .removexattr = cifs_removexattr,
855 #endif
856 };
857
858 const struct file_operations cifs_file_ops = {
859 .read = do_sync_read,
860 .write = do_sync_write,
861 .aio_read = generic_file_aio_read,
862 .aio_write = cifs_file_aio_write,
863 .open = cifs_open,
864 .release = cifs_close,
865 .lock = cifs_lock,
866 .fsync = cifs_fsync,
867 .flush = cifs_flush,
868 .mmap = cifs_file_mmap,
869 .splice_read = generic_file_splice_read,
870 .llseek = cifs_llseek,
871 #ifdef CONFIG_CIFS_POSIX
872 .unlocked_ioctl = cifs_ioctl,
873 #endif /* CONFIG_CIFS_POSIX */
874 .setlease = cifs_setlease,
875 };
876
877 const struct file_operations cifs_file_strict_ops = {
878 .read = do_sync_read,
879 .write = do_sync_write,
880 .aio_read = cifs_strict_readv,
881 .aio_write = cifs_strict_writev,
882 .open = cifs_open,
883 .release = cifs_close,
884 .lock = cifs_lock,
885 .fsync = cifs_strict_fsync,
886 .flush = cifs_flush,
887 .mmap = cifs_file_strict_mmap,
888 .splice_read = generic_file_splice_read,
889 .llseek = cifs_llseek,
890 #ifdef CONFIG_CIFS_POSIX
891 .unlocked_ioctl = cifs_ioctl,
892 #endif /* CONFIG_CIFS_POSIX */
893 .setlease = cifs_setlease,
894 };
895
896 const struct file_operations cifs_file_direct_ops = {
897 /* BB reevaluate whether they can be done with directio, no cache */
898 .read = do_sync_read,
899 .write = do_sync_write,
900 .aio_read = cifs_user_readv,
901 .aio_write = cifs_user_writev,
902 .open = cifs_open,
903 .release = cifs_close,
904 .lock = cifs_lock,
905 .fsync = cifs_fsync,
906 .flush = cifs_flush,
907 .mmap = cifs_file_mmap,
908 .splice_read = generic_file_splice_read,
909 #ifdef CONFIG_CIFS_POSIX
910 .unlocked_ioctl = cifs_ioctl,
911 #endif /* CONFIG_CIFS_POSIX */
912 .llseek = cifs_llseek,
913 .setlease = cifs_setlease,
914 };
915
916 const struct file_operations cifs_file_nobrl_ops = {
917 .read = do_sync_read,
918 .write = do_sync_write,
919 .aio_read = generic_file_aio_read,
920 .aio_write = cifs_file_aio_write,
921 .open = cifs_open,
922 .release = cifs_close,
923 .fsync = cifs_fsync,
924 .flush = cifs_flush,
925 .mmap = cifs_file_mmap,
926 .splice_read = generic_file_splice_read,
927 .llseek = cifs_llseek,
928 #ifdef CONFIG_CIFS_POSIX
929 .unlocked_ioctl = cifs_ioctl,
930 #endif /* CONFIG_CIFS_POSIX */
931 .setlease = cifs_setlease,
932 };
933
934 const struct file_operations cifs_file_strict_nobrl_ops = {
935 .read = do_sync_read,
936 .write = do_sync_write,
937 .aio_read = cifs_strict_readv,
938 .aio_write = cifs_strict_writev,
939 .open = cifs_open,
940 .release = cifs_close,
941 .fsync = cifs_strict_fsync,
942 .flush = cifs_flush,
943 .mmap = cifs_file_strict_mmap,
944 .splice_read = generic_file_splice_read,
945 .llseek = cifs_llseek,
946 #ifdef CONFIG_CIFS_POSIX
947 .unlocked_ioctl = cifs_ioctl,
948 #endif /* CONFIG_CIFS_POSIX */
949 .setlease = cifs_setlease,
950 };
951
952 const struct file_operations cifs_file_direct_nobrl_ops = {
953 /* BB reevaluate whether they can be done with directio, no cache */
954 .read = do_sync_read,
955 .write = do_sync_write,
956 .aio_read = cifs_user_readv,
957 .aio_write = cifs_user_writev,
958 .open = cifs_open,
959 .release = cifs_close,
960 .fsync = cifs_fsync,
961 .flush = cifs_flush,
962 .mmap = cifs_file_mmap,
963 .splice_read = generic_file_splice_read,
964 #ifdef CONFIG_CIFS_POSIX
965 .unlocked_ioctl = cifs_ioctl,
966 #endif /* CONFIG_CIFS_POSIX */
967 .llseek = cifs_llseek,
968 .setlease = cifs_setlease,
969 };
970
971 const struct file_operations cifs_dir_ops = {
972 .readdir = cifs_readdir,
973 .release = cifs_closedir,
974 .read = generic_read_dir,
975 .unlocked_ioctl = cifs_ioctl,
976 .llseek = generic_file_llseek,
977 };
978
979 static void
cifs_init_once(void * inode)980 cifs_init_once(void *inode)
981 {
982 struct cifsInodeInfo *cifsi = inode;
983
984 inode_init_once(&cifsi->vfs_inode);
985 init_rwsem(&cifsi->lock_sem);
986 }
987
988 static int
cifs_init_inodecache(void)989 cifs_init_inodecache(void)
990 {
991 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
992 sizeof(struct cifsInodeInfo),
993 0, (SLAB_RECLAIM_ACCOUNT|
994 SLAB_MEM_SPREAD),
995 cifs_init_once);
996 if (cifs_inode_cachep == NULL)
997 return -ENOMEM;
998
999 return 0;
1000 }
1001
1002 static void
cifs_destroy_inodecache(void)1003 cifs_destroy_inodecache(void)
1004 {
1005 /*
1006 * Make sure all delayed rcu free inodes are flushed before we
1007 * destroy cache.
1008 */
1009 rcu_barrier();
1010 kmem_cache_destroy(cifs_inode_cachep);
1011 }
1012
1013 static int
cifs_init_request_bufs(void)1014 cifs_init_request_bufs(void)
1015 {
1016 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1017 #ifdef CONFIG_CIFS_SMB2
1018 /*
1019 * SMB2 maximum header size is bigger than CIFS one - no problems to
1020 * allocate some more bytes for CIFS.
1021 */
1022 max_hdr_size = MAX_SMB2_HDR_SIZE;
1023 #endif
1024 if (CIFSMaxBufSize < 8192) {
1025 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1026 Unicode path name has to fit in any SMB/CIFS path based frames */
1027 CIFSMaxBufSize = 8192;
1028 } else if (CIFSMaxBufSize > 1024*127) {
1029 CIFSMaxBufSize = 1024 * 127;
1030 } else {
1031 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1032 }
1033 /*
1034 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1035 CIFSMaxBufSize, CIFSMaxBufSize);
1036 */
1037 cifs_req_cachep = kmem_cache_create("cifs_request",
1038 CIFSMaxBufSize + max_hdr_size, 0,
1039 SLAB_HWCACHE_ALIGN, NULL);
1040 if (cifs_req_cachep == NULL)
1041 return -ENOMEM;
1042
1043 if (cifs_min_rcv < 1)
1044 cifs_min_rcv = 1;
1045 else if (cifs_min_rcv > 64) {
1046 cifs_min_rcv = 64;
1047 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1048 }
1049
1050 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1051 cifs_req_cachep);
1052
1053 if (cifs_req_poolp == NULL) {
1054 kmem_cache_destroy(cifs_req_cachep);
1055 return -ENOMEM;
1056 }
1057 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1058 almost all handle based requests (but not write response, nor is it
1059 sufficient for path based requests). A smaller size would have
1060 been more efficient (compacting multiple slab items on one 4k page)
1061 for the case in which debug was on, but this larger size allows
1062 more SMBs to use small buffer alloc and is still much more
1063 efficient to alloc 1 per page off the slab compared to 17K (5page)
1064 alloc of large cifs buffers even when page debugging is on */
1065 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1066 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1067 NULL);
1068 if (cifs_sm_req_cachep == NULL) {
1069 mempool_destroy(cifs_req_poolp);
1070 kmem_cache_destroy(cifs_req_cachep);
1071 return -ENOMEM;
1072 }
1073
1074 if (cifs_min_small < 2)
1075 cifs_min_small = 2;
1076 else if (cifs_min_small > 256) {
1077 cifs_min_small = 256;
1078 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1079 }
1080
1081 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1082 cifs_sm_req_cachep);
1083
1084 if (cifs_sm_req_poolp == NULL) {
1085 mempool_destroy(cifs_req_poolp);
1086 kmem_cache_destroy(cifs_req_cachep);
1087 kmem_cache_destroy(cifs_sm_req_cachep);
1088 return -ENOMEM;
1089 }
1090
1091 return 0;
1092 }
1093
1094 static void
cifs_destroy_request_bufs(void)1095 cifs_destroy_request_bufs(void)
1096 {
1097 mempool_destroy(cifs_req_poolp);
1098 kmem_cache_destroy(cifs_req_cachep);
1099 mempool_destroy(cifs_sm_req_poolp);
1100 kmem_cache_destroy(cifs_sm_req_cachep);
1101 }
1102
1103 static int
cifs_init_mids(void)1104 cifs_init_mids(void)
1105 {
1106 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1107 sizeof(struct mid_q_entry), 0,
1108 SLAB_HWCACHE_ALIGN, NULL);
1109 if (cifs_mid_cachep == NULL)
1110 return -ENOMEM;
1111
1112 /* 3 is a reasonable minimum number of simultaneous operations */
1113 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1114 if (cifs_mid_poolp == NULL) {
1115 kmem_cache_destroy(cifs_mid_cachep);
1116 return -ENOMEM;
1117 }
1118
1119 return 0;
1120 }
1121
1122 static void
cifs_destroy_mids(void)1123 cifs_destroy_mids(void)
1124 {
1125 mempool_destroy(cifs_mid_poolp);
1126 kmem_cache_destroy(cifs_mid_cachep);
1127 }
1128
1129 static int __init
init_cifs(void)1130 init_cifs(void)
1131 {
1132 int rc = 0;
1133 cifs_proc_init();
1134 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1135 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1136 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1137 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1138 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1139 /*
1140 * Initialize Global counters
1141 */
1142 atomic_set(&sesInfoAllocCount, 0);
1143 atomic_set(&tconInfoAllocCount, 0);
1144 atomic_set(&tcpSesAllocCount, 0);
1145 atomic_set(&tcpSesReconnectCount, 0);
1146 atomic_set(&tconInfoReconnectCount, 0);
1147
1148 atomic_set(&bufAllocCount, 0);
1149 atomic_set(&smBufAllocCount, 0);
1150 #ifdef CONFIG_CIFS_STATS2
1151 atomic_set(&totBufAllocCount, 0);
1152 atomic_set(&totSmBufAllocCount, 0);
1153 #endif /* CONFIG_CIFS_STATS2 */
1154
1155 atomic_set(&midCount, 0);
1156 GlobalCurrentXid = 0;
1157 GlobalTotalActiveXid = 0;
1158 GlobalMaxActiveXid = 0;
1159 spin_lock_init(&cifs_tcp_ses_lock);
1160 spin_lock_init(&cifs_file_list_lock);
1161 spin_lock_init(&GlobalMid_Lock);
1162
1163 #ifdef CONFIG_CIFS_SMB2
1164 get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1165 #endif
1166
1167 if (cifs_max_pending < 2) {
1168 cifs_max_pending = 2;
1169 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1170 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1171 cifs_max_pending = CIFS_MAX_REQ;
1172 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1173 CIFS_MAX_REQ);
1174 }
1175
1176 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1177 if (!cifsiod_wq) {
1178 rc = -ENOMEM;
1179 goto out_clean_proc;
1180 }
1181
1182 rc = cifs_fscache_register();
1183 if (rc)
1184 goto out_destroy_wq;
1185
1186 rc = cifs_init_inodecache();
1187 if (rc)
1188 goto out_unreg_fscache;
1189
1190 rc = cifs_init_mids();
1191 if (rc)
1192 goto out_destroy_inodecache;
1193
1194 rc = cifs_init_request_bufs();
1195 if (rc)
1196 goto out_destroy_mids;
1197
1198 #ifdef CONFIG_CIFS_UPCALL
1199 rc = register_key_type(&cifs_spnego_key_type);
1200 if (rc)
1201 goto out_destroy_request_bufs;
1202 #endif /* CONFIG_CIFS_UPCALL */
1203
1204 #ifdef CONFIG_CIFS_ACL
1205 rc = init_cifs_idmap();
1206 if (rc)
1207 goto out_register_key_type;
1208 #endif /* CONFIG_CIFS_ACL */
1209
1210 rc = register_filesystem(&cifs_fs_type);
1211 if (rc)
1212 goto out_init_cifs_idmap;
1213
1214 return 0;
1215
1216 out_init_cifs_idmap:
1217 #ifdef CONFIG_CIFS_ACL
1218 exit_cifs_idmap();
1219 out_register_key_type:
1220 #endif
1221 #ifdef CONFIG_CIFS_UPCALL
1222 unregister_key_type(&cifs_spnego_key_type);
1223 out_destroy_request_bufs:
1224 #endif
1225 cifs_destroy_request_bufs();
1226 out_destroy_mids:
1227 cifs_destroy_mids();
1228 out_destroy_inodecache:
1229 cifs_destroy_inodecache();
1230 out_unreg_fscache:
1231 cifs_fscache_unregister();
1232 out_destroy_wq:
1233 destroy_workqueue(cifsiod_wq);
1234 out_clean_proc:
1235 cifs_proc_clean();
1236 return rc;
1237 }
1238
1239 static void __exit
exit_cifs(void)1240 exit_cifs(void)
1241 {
1242 cifs_dbg(NOISY, "exit_cifs\n");
1243 unregister_filesystem(&cifs_fs_type);
1244 cifs_dfs_release_automount_timer();
1245 #ifdef CONFIG_CIFS_ACL
1246 exit_cifs_idmap();
1247 #endif
1248 #ifdef CONFIG_CIFS_UPCALL
1249 unregister_key_type(&cifs_spnego_key_type);
1250 #endif
1251 cifs_destroy_request_bufs();
1252 cifs_destroy_mids();
1253 cifs_destroy_inodecache();
1254 cifs_fscache_unregister();
1255 destroy_workqueue(cifsiod_wq);
1256 cifs_proc_clean();
1257 }
1258
1259 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1260 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1261 MODULE_DESCRIPTION
1262 ("VFS to access servers complying with the SNIA CIFS Specification "
1263 "e.g. Samba and Windows");
1264 MODULE_VERSION(CIFS_VERSION);
1265 module_init(init_cifs)
1266 module_exit(exit_cifs)
1267