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 /*
91 * Bumps refcount for cifs super block.
92 * Note that it should be only called if a referece to VFS super block is
93 * already held, e.g. in open-type syscalls context. Otherwise it can race with
94 * atomic_dec_and_test in deactivate_locked_super.
95 */
96 void
cifs_sb_active(struct super_block * sb)97 cifs_sb_active(struct super_block *sb)
98 {
99 struct cifs_sb_info *server = CIFS_SB(sb);
100
101 if (atomic_inc_return(&server->active) == 1)
102 atomic_inc(&sb->s_active);
103 }
104
105 void
cifs_sb_deactive(struct super_block * sb)106 cifs_sb_deactive(struct super_block *sb)
107 {
108 struct cifs_sb_info *server = CIFS_SB(sb);
109
110 if (atomic_dec_and_test(&server->active))
111 deactivate_super(sb);
112 }
113
114 static int
cifs_read_super(struct super_block * sb)115 cifs_read_super(struct super_block *sb)
116 {
117 struct inode *inode;
118 struct cifs_sb_info *cifs_sb;
119 struct cifs_tcon *tcon;
120 int rc = 0;
121
122 cifs_sb = CIFS_SB(sb);
123 tcon = cifs_sb_master_tcon(cifs_sb);
124
125 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
126 sb->s_flags |= MS_POSIXACL;
127
128 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
129 sb->s_maxbytes = MAX_LFS_FILESIZE;
130 else
131 sb->s_maxbytes = MAX_NON_LFS;
132
133 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
134 sb->s_time_gran = 100;
135
136 sb->s_magic = CIFS_MAGIC_NUMBER;
137 sb->s_op = &cifs_super_ops;
138 sb->s_bdi = &cifs_sb->bdi;
139 sb->s_blocksize = CIFS_MAX_MSGSIZE;
140 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
141 inode = cifs_root_iget(sb);
142
143 if (IS_ERR(inode)) {
144 rc = PTR_ERR(inode);
145 goto out_no_root;
146 }
147
148 if (tcon->nocase)
149 sb->s_d_op = &cifs_ci_dentry_ops;
150 else
151 sb->s_d_op = &cifs_dentry_ops;
152
153 sb->s_root = d_make_root(inode);
154 if (!sb->s_root) {
155 rc = -ENOMEM;
156 goto out_no_root;
157 }
158
159 #ifdef CONFIG_CIFS_NFSD_EXPORT
160 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
161 cifs_dbg(FYI, "export ops supported\n");
162 sb->s_export_op = &cifs_export_ops;
163 }
164 #endif /* CONFIG_CIFS_NFSD_EXPORT */
165
166 return 0;
167
168 out_no_root:
169 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
170 return rc;
171 }
172
cifs_kill_sb(struct super_block * sb)173 static void cifs_kill_sb(struct super_block *sb)
174 {
175 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
176 kill_anon_super(sb);
177 cifs_umount(cifs_sb);
178 }
179
180 static int
cifs_statfs(struct dentry * dentry,struct kstatfs * buf)181 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
182 {
183 struct super_block *sb = dentry->d_sb;
184 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
185 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
186 struct TCP_Server_Info *server = tcon->ses->server;
187 unsigned int xid;
188 int rc = 0;
189
190 xid = get_xid();
191
192 /*
193 * PATH_MAX may be too long - it would presumably be total path,
194 * but note that some servers (includinng Samba 3) have a shorter
195 * maximum path.
196 *
197 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
198 */
199 buf->f_namelen = PATH_MAX;
200 buf->f_files = 0; /* undefined */
201 buf->f_ffree = 0; /* unlimited */
202
203 if (server->ops->queryfs)
204 rc = server->ops->queryfs(xid, tcon, buf);
205
206 free_xid(xid);
207 return 0;
208 }
209
cifs_fallocate(struct file * file,int mode,loff_t off,loff_t len)210 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
211 {
212 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
213 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
214 struct TCP_Server_Info *server = tcon->ses->server;
215
216 if (server->ops->fallocate)
217 return server->ops->fallocate(file, tcon, mode, off, len);
218
219 return -EOPNOTSUPP;
220 }
221
cifs_permission(struct inode * inode,int mask)222 static int cifs_permission(struct inode *inode, int mask)
223 {
224 struct cifs_sb_info *cifs_sb;
225
226 cifs_sb = CIFS_SB(inode->i_sb);
227
228 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
229 if ((mask & MAY_EXEC) && !execute_ok(inode))
230 return -EACCES;
231 else
232 return 0;
233 } else /* file mode might have been restricted at mount time
234 on the client (above and beyond ACL on servers) for
235 servers which do not support setting and viewing mode bits,
236 so allowing client to check permissions is useful */
237 return generic_permission(inode, mask);
238 }
239
240 static struct kmem_cache *cifs_inode_cachep;
241 static struct kmem_cache *cifs_req_cachep;
242 static struct kmem_cache *cifs_mid_cachep;
243 static struct kmem_cache *cifs_sm_req_cachep;
244 mempool_t *cifs_sm_req_poolp;
245 mempool_t *cifs_req_poolp;
246 mempool_t *cifs_mid_poolp;
247
248 static struct inode *
cifs_alloc_inode(struct super_block * sb)249 cifs_alloc_inode(struct super_block *sb)
250 {
251 struct cifsInodeInfo *cifs_inode;
252 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
253 if (!cifs_inode)
254 return NULL;
255 cifs_inode->cifsAttrs = 0x20; /* default */
256 cifs_inode->time = 0;
257 /*
258 * Until the file is open and we have gotten oplock info back from the
259 * server, can not assume caching of file data or metadata.
260 */
261 cifs_set_oplock_level(cifs_inode, 0);
262 cifs_inode->flags = 0;
263 spin_lock_init(&cifs_inode->writers_lock);
264 cifs_inode->writers = 0;
265 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
266 cifs_inode->server_eof = 0;
267 cifs_inode->uniqueid = 0;
268 cifs_inode->createtime = 0;
269 cifs_inode->epoch = 0;
270 #ifdef CONFIG_CIFS_SMB2
271 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
272 #endif
273 /*
274 * Can not set i_flags here - they get immediately overwritten to zero
275 * by the VFS.
276 */
277 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
278 INIT_LIST_HEAD(&cifs_inode->openFileList);
279 INIT_LIST_HEAD(&cifs_inode->llist);
280 return &cifs_inode->vfs_inode;
281 }
282
cifs_i_callback(struct rcu_head * head)283 static void cifs_i_callback(struct rcu_head *head)
284 {
285 struct inode *inode = container_of(head, struct inode, i_rcu);
286 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
287 }
288
289 static void
cifs_destroy_inode(struct inode * inode)290 cifs_destroy_inode(struct inode *inode)
291 {
292 call_rcu(&inode->i_rcu, cifs_i_callback);
293 }
294
295 static void
cifs_evict_inode(struct inode * inode)296 cifs_evict_inode(struct inode *inode)
297 {
298 truncate_inode_pages_final(&inode->i_data);
299 clear_inode(inode);
300 cifs_fscache_release_inode_cookie(inode);
301 }
302
303 static void
cifs_show_address(struct seq_file * s,struct TCP_Server_Info * server)304 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
305 {
306 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
307 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
308
309 seq_puts(s, ",addr=");
310
311 switch (server->dstaddr.ss_family) {
312 case AF_INET:
313 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
314 break;
315 case AF_INET6:
316 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
317 if (sa6->sin6_scope_id)
318 seq_printf(s, "%%%u", sa6->sin6_scope_id);
319 break;
320 default:
321 seq_puts(s, "(unknown)");
322 }
323 }
324
325 static void
cifs_show_security(struct seq_file * s,struct cifs_ses * ses)326 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
327 {
328 if (ses->sectype == Unspecified) {
329 if (ses->user_name == NULL)
330 seq_puts(s, ",sec=none");
331 return;
332 }
333
334 seq_puts(s, ",sec=");
335
336 switch (ses->sectype) {
337 case LANMAN:
338 seq_puts(s, "lanman");
339 break;
340 case NTLMv2:
341 seq_puts(s, "ntlmv2");
342 break;
343 case NTLM:
344 seq_puts(s, "ntlm");
345 break;
346 case Kerberos:
347 seq_puts(s, "krb5");
348 break;
349 case RawNTLMSSP:
350 seq_puts(s, "ntlmssp");
351 break;
352 default:
353 /* shouldn't ever happen */
354 seq_puts(s, "unknown");
355 break;
356 }
357
358 if (ses->sign)
359 seq_puts(s, "i");
360 }
361
362 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)363 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
364 {
365 seq_puts(s, ",cache=");
366
367 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
368 seq_puts(s, "strict");
369 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
370 seq_puts(s, "none");
371 else
372 seq_puts(s, "loose");
373 }
374
375 static void
cifs_show_nls(struct seq_file * s,struct nls_table * cur)376 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
377 {
378 struct nls_table *def;
379
380 /* Display iocharset= option if it's not default charset */
381 def = load_nls_default();
382 if (def != cur)
383 seq_printf(s, ",iocharset=%s", cur->charset);
384 unload_nls(def);
385 }
386
387 /*
388 * cifs_show_options() is for displaying mount options in /proc/mounts.
389 * Not all settable options are displayed but most of the important
390 * ones are.
391 */
392 static int
cifs_show_options(struct seq_file * s,struct dentry * root)393 cifs_show_options(struct seq_file *s, struct dentry *root)
394 {
395 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
396 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
397 struct sockaddr *srcaddr;
398 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
399
400 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
401 cifs_show_security(s, tcon->ses);
402 cifs_show_cache_flavor(s, cifs_sb);
403
404 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
405 seq_puts(s, ",multiuser");
406 else if (tcon->ses->user_name)
407 seq_show_option(s, "username", tcon->ses->user_name);
408
409 if (tcon->ses->domainName)
410 seq_show_option(s, "domain", tcon->ses->domainName);
411
412 if (srcaddr->sa_family != AF_UNSPEC) {
413 struct sockaddr_in *saddr4;
414 struct sockaddr_in6 *saddr6;
415 saddr4 = (struct sockaddr_in *)srcaddr;
416 saddr6 = (struct sockaddr_in6 *)srcaddr;
417 if (srcaddr->sa_family == AF_INET6)
418 seq_printf(s, ",srcaddr=%pI6c",
419 &saddr6->sin6_addr);
420 else if (srcaddr->sa_family == AF_INET)
421 seq_printf(s, ",srcaddr=%pI4",
422 &saddr4->sin_addr.s_addr);
423 else
424 seq_printf(s, ",srcaddr=BAD-AF:%i",
425 (int)(srcaddr->sa_family));
426 }
427
428 seq_printf(s, ",uid=%u",
429 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
430 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
431 seq_puts(s, ",forceuid");
432 else
433 seq_puts(s, ",noforceuid");
434
435 seq_printf(s, ",gid=%u",
436 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
437 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
438 seq_puts(s, ",forcegid");
439 else
440 seq_puts(s, ",noforcegid");
441
442 cifs_show_address(s, tcon->ses->server);
443
444 if (!tcon->unix_ext)
445 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
446 cifs_sb->mnt_file_mode,
447 cifs_sb->mnt_dir_mode);
448
449 cifs_show_nls(s, cifs_sb->local_nls);
450
451 if (tcon->seal)
452 seq_puts(s, ",seal");
453 if (tcon->nocase)
454 seq_puts(s, ",nocase");
455 if (tcon->retry)
456 seq_puts(s, ",hard");
457 if (tcon->use_persistent)
458 seq_puts(s, ",persistenthandles");
459 else if (tcon->use_resilient)
460 seq_puts(s, ",resilienthandles");
461 if (tcon->unix_ext)
462 seq_puts(s, ",unix");
463 else
464 seq_puts(s, ",nounix");
465 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
466 seq_puts(s, ",posixpaths");
467 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
468 seq_puts(s, ",setuids");
469 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
470 seq_puts(s, ",serverino");
471 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
472 seq_puts(s, ",rwpidforward");
473 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
474 seq_puts(s, ",forcemand");
475 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
476 seq_puts(s, ",nouser_xattr");
477 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
478 seq_puts(s, ",mapchars");
479 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
480 seq_puts(s, ",mapposix");
481 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
482 seq_puts(s, ",sfu");
483 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
484 seq_puts(s, ",nobrl");
485 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
486 seq_puts(s, ",cifsacl");
487 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
488 seq_puts(s, ",dynperm");
489 if (root->d_sb->s_flags & MS_POSIXACL)
490 seq_puts(s, ",acl");
491 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
492 seq_puts(s, ",mfsymlinks");
493 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
494 seq_puts(s, ",fsc");
495 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
496 seq_puts(s, ",nostrictsync");
497 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
498 seq_puts(s, ",noperm");
499 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
500 seq_printf(s, ",backupuid=%u",
501 from_kuid_munged(&init_user_ns,
502 cifs_sb->mnt_backupuid));
503 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
504 seq_printf(s, ",backupgid=%u",
505 from_kgid_munged(&init_user_ns,
506 cifs_sb->mnt_backupgid));
507
508 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
509 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
510 /* convert actimeo and display it in seconds */
511 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
512
513 return 0;
514 }
515
cifs_umount_begin(struct super_block * sb)516 static void cifs_umount_begin(struct super_block *sb)
517 {
518 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
519 struct cifs_tcon *tcon;
520
521 if (cifs_sb == NULL)
522 return;
523
524 tcon = cifs_sb_master_tcon(cifs_sb);
525
526 spin_lock(&cifs_tcp_ses_lock);
527 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
528 /* we have other mounts to same share or we have
529 already tried to force umount this and woken up
530 all waiting network requests, nothing to do */
531 spin_unlock(&cifs_tcp_ses_lock);
532 return;
533 } else if (tcon->tc_count == 1)
534 tcon->tidStatus = CifsExiting;
535 spin_unlock(&cifs_tcp_ses_lock);
536
537 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
538 /* cancel_notify_requests(tcon); */
539 if (tcon->ses && tcon->ses->server) {
540 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
541 wake_up_all(&tcon->ses->server->request_q);
542 wake_up_all(&tcon->ses->server->response_q);
543 msleep(1); /* yield */
544 /* we have to kick the requests once more */
545 wake_up_all(&tcon->ses->server->response_q);
546 msleep(1);
547 }
548
549 return;
550 }
551
552 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)553 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
554 {
555 /* BB FIXME */
556 return 0;
557 }
558 #endif
559
cifs_remount(struct super_block * sb,int * flags,char * data)560 static int cifs_remount(struct super_block *sb, int *flags, char *data)
561 {
562 sync_filesystem(sb);
563 *flags |= MS_NODIRATIME;
564 return 0;
565 }
566
cifs_drop_inode(struct inode * inode)567 static int cifs_drop_inode(struct inode *inode)
568 {
569 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
570
571 /* no serverino => unconditional eviction */
572 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
573 generic_drop_inode(inode);
574 }
575
576 static const struct super_operations cifs_super_ops = {
577 .statfs = cifs_statfs,
578 .alloc_inode = cifs_alloc_inode,
579 .destroy_inode = cifs_destroy_inode,
580 .drop_inode = cifs_drop_inode,
581 .evict_inode = cifs_evict_inode,
582 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
583 function unless later we add lazy close of inodes or unless the
584 kernel forgets to call us with the same number of releases (closes)
585 as opens */
586 .show_options = cifs_show_options,
587 .umount_begin = cifs_umount_begin,
588 .remount_fs = cifs_remount,
589 #ifdef CONFIG_CIFS_STATS2
590 .show_stats = cifs_show_stats,
591 #endif
592 };
593
594 /*
595 * Get root dentry from superblock according to prefix path mount option.
596 * Return dentry with refcount + 1 on success and NULL otherwise.
597 */
598 static struct dentry *
cifs_get_root(struct smb_vol * vol,struct super_block * sb)599 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
600 {
601 struct dentry *dentry;
602 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
603 char *full_path = NULL;
604 char *s, *p;
605 char sep;
606
607 full_path = cifs_build_path_to_root(vol, cifs_sb,
608 cifs_sb_master_tcon(cifs_sb));
609 if (full_path == NULL)
610 return ERR_PTR(-ENOMEM);
611
612 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
613
614 sep = CIFS_DIR_SEP(cifs_sb);
615 dentry = dget(sb->s_root);
616 p = s = full_path;
617
618 do {
619 struct inode *dir = d_inode(dentry);
620 struct dentry *child;
621
622 if (!dir) {
623 dput(dentry);
624 dentry = ERR_PTR(-ENOENT);
625 break;
626 }
627 if (!S_ISDIR(dir->i_mode)) {
628 dput(dentry);
629 dentry = ERR_PTR(-ENOTDIR);
630 break;
631 }
632
633 /* skip separators */
634 while (*s == sep)
635 s++;
636 if (!*s)
637 break;
638 p = s++;
639 /* next separator */
640 while (*s && *s != sep)
641 s++;
642
643 mutex_lock(&dir->i_mutex);
644 child = lookup_one_len(p, dentry, s - p);
645 mutex_unlock(&dir->i_mutex);
646 dput(dentry);
647 dentry = child;
648 } while (!IS_ERR(dentry));
649 kfree(full_path);
650 return dentry;
651 }
652
cifs_set_super(struct super_block * sb,void * data)653 static int cifs_set_super(struct super_block *sb, void *data)
654 {
655 struct cifs_mnt_data *mnt_data = data;
656 sb->s_fs_info = mnt_data->cifs_sb;
657 return set_anon_super(sb, NULL);
658 }
659
660 static struct dentry *
cifs_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)661 cifs_do_mount(struct file_system_type *fs_type,
662 int flags, const char *dev_name, void *data)
663 {
664 int rc;
665 struct super_block *sb;
666 struct cifs_sb_info *cifs_sb;
667 struct smb_vol *volume_info;
668 struct cifs_mnt_data mnt_data;
669 struct dentry *root;
670
671 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
672
673 volume_info = cifs_get_volume_info((char *)data, dev_name);
674 if (IS_ERR(volume_info))
675 return ERR_CAST(volume_info);
676
677 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
678 if (cifs_sb == NULL) {
679 root = ERR_PTR(-ENOMEM);
680 goto out_nls;
681 }
682
683 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
684 if (cifs_sb->mountdata == NULL) {
685 root = ERR_PTR(-ENOMEM);
686 goto out_cifs_sb;
687 }
688
689 cifs_setup_cifs_sb(volume_info, cifs_sb);
690
691 rc = cifs_mount(cifs_sb, volume_info);
692 if (rc) {
693 if (!(flags & MS_SILENT))
694 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
695 rc);
696 root = ERR_PTR(rc);
697 goto out_mountdata;
698 }
699
700 mnt_data.vol = volume_info;
701 mnt_data.cifs_sb = cifs_sb;
702 mnt_data.flags = flags;
703
704 /* BB should we make this contingent on mount parm? */
705 flags |= MS_NODIRATIME | MS_NOATIME;
706
707 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
708 if (IS_ERR(sb)) {
709 root = ERR_CAST(sb);
710 cifs_umount(cifs_sb);
711 goto out;
712 }
713
714 if (sb->s_root) {
715 cifs_dbg(FYI, "Use existing superblock\n");
716 cifs_umount(cifs_sb);
717 } else {
718 rc = cifs_read_super(sb);
719 if (rc) {
720 root = ERR_PTR(rc);
721 goto out_super;
722 }
723
724 sb->s_flags |= MS_ACTIVE;
725 }
726
727 root = cifs_get_root(volume_info, sb);
728 if (IS_ERR(root))
729 goto out_super;
730
731 cifs_dbg(FYI, "dentry root is: %p\n", root);
732 goto out;
733
734 out_super:
735 deactivate_locked_super(sb);
736 out:
737 cifs_cleanup_volume_info(volume_info);
738 return root;
739
740 out_mountdata:
741 kfree(cifs_sb->mountdata);
742 out_cifs_sb:
743 kfree(cifs_sb);
744 out_nls:
745 unload_nls(volume_info->local_nls);
746 goto out;
747 }
748
749 static ssize_t
cifs_loose_read_iter(struct kiocb * iocb,struct iov_iter * iter)750 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
751 {
752 ssize_t rc;
753 struct inode *inode = file_inode(iocb->ki_filp);
754
755 rc = cifs_revalidate_mapping(inode);
756 if (rc)
757 return rc;
758
759 return generic_file_read_iter(iocb, iter);
760 }
761
cifs_file_write_iter(struct kiocb * iocb,struct iov_iter * from)762 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
763 {
764 struct inode *inode = file_inode(iocb->ki_filp);
765 struct cifsInodeInfo *cinode = CIFS_I(inode);
766 ssize_t written;
767 int rc;
768
769 written = cifs_get_writer(cinode);
770 if (written)
771 return written;
772
773 written = generic_file_write_iter(iocb, from);
774
775 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
776 goto out;
777
778 rc = filemap_fdatawrite(inode->i_mapping);
779 if (rc)
780 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
781 rc, inode);
782
783 out:
784 cifs_put_writer(cinode);
785 return written;
786 }
787
cifs_llseek(struct file * file,loff_t offset,int whence)788 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
789 {
790 /*
791 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
792 * the cached file length
793 */
794 if (whence != SEEK_SET && whence != SEEK_CUR) {
795 int rc;
796 struct inode *inode = file_inode(file);
797
798 /*
799 * We need to be sure that all dirty pages are written and the
800 * server has the newest file length.
801 */
802 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
803 inode->i_mapping->nrpages != 0) {
804 rc = filemap_fdatawait(inode->i_mapping);
805 if (rc) {
806 mapping_set_error(inode->i_mapping, rc);
807 return rc;
808 }
809 }
810 /*
811 * Some applications poll for the file length in this strange
812 * way so we must seek to end on non-oplocked files by
813 * setting the revalidate time to zero.
814 */
815 CIFS_I(inode)->time = 0;
816
817 rc = cifs_revalidate_file_attr(file);
818 if (rc < 0)
819 return (loff_t)rc;
820 }
821 return generic_file_llseek(file, offset, whence);
822 }
823
824 static int
cifs_setlease(struct file * file,long arg,struct file_lock ** lease,void ** priv)825 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
826 {
827 /*
828 * Note that this is called by vfs setlease with i_lock held to
829 * protect *lease from going away.
830 */
831 struct inode *inode = file_inode(file);
832 struct cifsFileInfo *cfile = file->private_data;
833
834 if (!(S_ISREG(inode->i_mode)))
835 return -EINVAL;
836
837 /* Check if file is oplocked if this is request for new lease */
838 if (arg == F_UNLCK ||
839 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
840 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
841 return generic_setlease(file, arg, lease, priv);
842 else if (tlink_tcon(cfile->tlink)->local_lease &&
843 !CIFS_CACHE_READ(CIFS_I(inode)))
844 /*
845 * If the server claims to support oplock on this file, then we
846 * still need to check oplock even if the local_lease mount
847 * option is set, but there are servers which do not support
848 * oplock for which this mount option may be useful if the user
849 * knows that the file won't be changed on the server by anyone
850 * else.
851 */
852 return generic_setlease(file, arg, lease, priv);
853 else
854 return -EAGAIN;
855 }
856
857 struct file_system_type cifs_fs_type = {
858 .owner = THIS_MODULE,
859 .name = "cifs",
860 .mount = cifs_do_mount,
861 .kill_sb = cifs_kill_sb,
862 /* .fs_flags */
863 };
864 MODULE_ALIAS_FS("cifs");
865 const struct inode_operations cifs_dir_inode_ops = {
866 .create = cifs_create,
867 .atomic_open = cifs_atomic_open,
868 .lookup = cifs_lookup,
869 .getattr = cifs_getattr,
870 .unlink = cifs_unlink,
871 .link = cifs_hardlink,
872 .mkdir = cifs_mkdir,
873 .rmdir = cifs_rmdir,
874 .rename2 = cifs_rename2,
875 .permission = cifs_permission,
876 /* revalidate:cifs_revalidate, */
877 .setattr = cifs_setattr,
878 .symlink = cifs_symlink,
879 .mknod = cifs_mknod,
880 #ifdef CONFIG_CIFS_XATTR
881 .setxattr = cifs_setxattr,
882 .getxattr = cifs_getxattr,
883 .listxattr = cifs_listxattr,
884 .removexattr = cifs_removexattr,
885 #endif
886 };
887
888 const struct inode_operations cifs_file_inode_ops = {
889 /* revalidate:cifs_revalidate, */
890 .setattr = cifs_setattr,
891 .getattr = cifs_getattr, /* do we need this anymore? */
892 .permission = cifs_permission,
893 #ifdef CONFIG_CIFS_XATTR
894 .setxattr = cifs_setxattr,
895 .getxattr = cifs_getxattr,
896 .listxattr = cifs_listxattr,
897 .removexattr = cifs_removexattr,
898 #endif
899 };
900
901 const struct inode_operations cifs_symlink_inode_ops = {
902 .readlink = generic_readlink,
903 .follow_link = cifs_follow_link,
904 .put_link = kfree_put_link,
905 .permission = cifs_permission,
906 /* BB add the following two eventually */
907 /* revalidate: cifs_revalidate,
908 setattr: cifs_notify_change, *//* BB do we need notify change */
909 #ifdef CONFIG_CIFS_XATTR
910 .setxattr = cifs_setxattr,
911 .getxattr = cifs_getxattr,
912 .listxattr = cifs_listxattr,
913 .removexattr = cifs_removexattr,
914 #endif
915 };
916
917 const struct file_operations cifs_file_ops = {
918 .read_iter = cifs_loose_read_iter,
919 .write_iter = cifs_file_write_iter,
920 .open = cifs_open,
921 .release = cifs_close,
922 .lock = cifs_lock,
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 .unlocked_ioctl = cifs_ioctl,
929 .setlease = cifs_setlease,
930 .fallocate = cifs_fallocate,
931 };
932
933 const struct file_operations cifs_file_strict_ops = {
934 .read_iter = cifs_strict_readv,
935 .write_iter = cifs_strict_writev,
936 .open = cifs_open,
937 .release = cifs_close,
938 .lock = cifs_lock,
939 .fsync = cifs_strict_fsync,
940 .flush = cifs_flush,
941 .mmap = cifs_file_strict_mmap,
942 .splice_read = generic_file_splice_read,
943 .llseek = cifs_llseek,
944 .unlocked_ioctl = cifs_ioctl,
945 .setlease = cifs_setlease,
946 .fallocate = cifs_fallocate,
947 };
948
949 const struct file_operations cifs_file_direct_ops = {
950 /* BB reevaluate whether they can be done with directio, no cache */
951 .read_iter = cifs_user_readv,
952 .write_iter = cifs_user_writev,
953 .open = cifs_open,
954 .release = cifs_close,
955 .lock = cifs_lock,
956 .fsync = cifs_fsync,
957 .flush = cifs_flush,
958 .mmap = cifs_file_mmap,
959 .splice_read = generic_file_splice_read,
960 .unlocked_ioctl = cifs_ioctl,
961 .llseek = cifs_llseek,
962 .setlease = cifs_setlease,
963 .fallocate = cifs_fallocate,
964 };
965
966 const struct file_operations cifs_file_nobrl_ops = {
967 .read_iter = cifs_loose_read_iter,
968 .write_iter = cifs_file_write_iter,
969 .open = cifs_open,
970 .release = cifs_close,
971 .fsync = cifs_fsync,
972 .flush = cifs_flush,
973 .mmap = cifs_file_mmap,
974 .splice_read = generic_file_splice_read,
975 .llseek = cifs_llseek,
976 .unlocked_ioctl = cifs_ioctl,
977 .setlease = cifs_setlease,
978 .fallocate = cifs_fallocate,
979 };
980
981 const struct file_operations cifs_file_strict_nobrl_ops = {
982 .read_iter = cifs_strict_readv,
983 .write_iter = cifs_strict_writev,
984 .open = cifs_open,
985 .release = cifs_close,
986 .fsync = cifs_strict_fsync,
987 .flush = cifs_flush,
988 .mmap = cifs_file_strict_mmap,
989 .splice_read = generic_file_splice_read,
990 .llseek = cifs_llseek,
991 .unlocked_ioctl = cifs_ioctl,
992 .setlease = cifs_setlease,
993 .fallocate = cifs_fallocate,
994 };
995
996 const struct file_operations cifs_file_direct_nobrl_ops = {
997 /* BB reevaluate whether they can be done with directio, no cache */
998 .read_iter = cifs_user_readv,
999 .write_iter = cifs_user_writev,
1000 .open = cifs_open,
1001 .release = cifs_close,
1002 .fsync = cifs_fsync,
1003 .flush = cifs_flush,
1004 .mmap = cifs_file_mmap,
1005 .splice_read = generic_file_splice_read,
1006 .unlocked_ioctl = cifs_ioctl,
1007 .llseek = cifs_llseek,
1008 .setlease = cifs_setlease,
1009 .fallocate = cifs_fallocate,
1010 };
1011
1012 const struct file_operations cifs_dir_ops = {
1013 .iterate = cifs_readdir,
1014 .release = cifs_closedir,
1015 .read = generic_read_dir,
1016 .unlocked_ioctl = cifs_ioctl,
1017 .llseek = generic_file_llseek,
1018 };
1019
1020 static void
cifs_init_once(void * inode)1021 cifs_init_once(void *inode)
1022 {
1023 struct cifsInodeInfo *cifsi = inode;
1024
1025 inode_init_once(&cifsi->vfs_inode);
1026 init_rwsem(&cifsi->lock_sem);
1027 }
1028
1029 static int __init
cifs_init_inodecache(void)1030 cifs_init_inodecache(void)
1031 {
1032 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1033 sizeof(struct cifsInodeInfo),
1034 0, (SLAB_RECLAIM_ACCOUNT|
1035 SLAB_MEM_SPREAD),
1036 cifs_init_once);
1037 if (cifs_inode_cachep == NULL)
1038 return -ENOMEM;
1039
1040 return 0;
1041 }
1042
1043 static void
cifs_destroy_inodecache(void)1044 cifs_destroy_inodecache(void)
1045 {
1046 /*
1047 * Make sure all delayed rcu free inodes are flushed before we
1048 * destroy cache.
1049 */
1050 rcu_barrier();
1051 kmem_cache_destroy(cifs_inode_cachep);
1052 }
1053
1054 static int
cifs_init_request_bufs(void)1055 cifs_init_request_bufs(void)
1056 {
1057 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1058 #ifdef CONFIG_CIFS_SMB2
1059 /*
1060 * SMB2 maximum header size is bigger than CIFS one - no problems to
1061 * allocate some more bytes for CIFS.
1062 */
1063 max_hdr_size = MAX_SMB2_HDR_SIZE;
1064 #endif
1065 if (CIFSMaxBufSize < 8192) {
1066 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1067 Unicode path name has to fit in any SMB/CIFS path based frames */
1068 CIFSMaxBufSize = 8192;
1069 } else if (CIFSMaxBufSize > 1024*127) {
1070 CIFSMaxBufSize = 1024 * 127;
1071 } else {
1072 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1073 }
1074 /*
1075 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1076 CIFSMaxBufSize, CIFSMaxBufSize);
1077 */
1078 cifs_req_cachep = kmem_cache_create("cifs_request",
1079 CIFSMaxBufSize + max_hdr_size, 0,
1080 SLAB_HWCACHE_ALIGN, NULL);
1081 if (cifs_req_cachep == NULL)
1082 return -ENOMEM;
1083
1084 if (cifs_min_rcv < 1)
1085 cifs_min_rcv = 1;
1086 else if (cifs_min_rcv > 64) {
1087 cifs_min_rcv = 64;
1088 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1089 }
1090
1091 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1092 cifs_req_cachep);
1093
1094 if (cifs_req_poolp == NULL) {
1095 kmem_cache_destroy(cifs_req_cachep);
1096 return -ENOMEM;
1097 }
1098 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1099 almost all handle based requests (but not write response, nor is it
1100 sufficient for path based requests). A smaller size would have
1101 been more efficient (compacting multiple slab items on one 4k page)
1102 for the case in which debug was on, but this larger size allows
1103 more SMBs to use small buffer alloc and is still much more
1104 efficient to alloc 1 per page off the slab compared to 17K (5page)
1105 alloc of large cifs buffers even when page debugging is on */
1106 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1107 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1108 NULL);
1109 if (cifs_sm_req_cachep == NULL) {
1110 mempool_destroy(cifs_req_poolp);
1111 kmem_cache_destroy(cifs_req_cachep);
1112 return -ENOMEM;
1113 }
1114
1115 if (cifs_min_small < 2)
1116 cifs_min_small = 2;
1117 else if (cifs_min_small > 256) {
1118 cifs_min_small = 256;
1119 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1120 }
1121
1122 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1123 cifs_sm_req_cachep);
1124
1125 if (cifs_sm_req_poolp == NULL) {
1126 mempool_destroy(cifs_req_poolp);
1127 kmem_cache_destroy(cifs_req_cachep);
1128 kmem_cache_destroy(cifs_sm_req_cachep);
1129 return -ENOMEM;
1130 }
1131
1132 return 0;
1133 }
1134
1135 static void
cifs_destroy_request_bufs(void)1136 cifs_destroy_request_bufs(void)
1137 {
1138 mempool_destroy(cifs_req_poolp);
1139 kmem_cache_destroy(cifs_req_cachep);
1140 mempool_destroy(cifs_sm_req_poolp);
1141 kmem_cache_destroy(cifs_sm_req_cachep);
1142 }
1143
1144 static int
cifs_init_mids(void)1145 cifs_init_mids(void)
1146 {
1147 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1148 sizeof(struct mid_q_entry), 0,
1149 SLAB_HWCACHE_ALIGN, NULL);
1150 if (cifs_mid_cachep == NULL)
1151 return -ENOMEM;
1152
1153 /* 3 is a reasonable minimum number of simultaneous operations */
1154 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1155 if (cifs_mid_poolp == NULL) {
1156 kmem_cache_destroy(cifs_mid_cachep);
1157 return -ENOMEM;
1158 }
1159
1160 return 0;
1161 }
1162
1163 static void
cifs_destroy_mids(void)1164 cifs_destroy_mids(void)
1165 {
1166 mempool_destroy(cifs_mid_poolp);
1167 kmem_cache_destroy(cifs_mid_cachep);
1168 }
1169
1170 static int __init
init_cifs(void)1171 init_cifs(void)
1172 {
1173 int rc = 0;
1174 cifs_proc_init();
1175 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1176 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1177 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1178 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1179 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1180 /*
1181 * Initialize Global counters
1182 */
1183 atomic_set(&sesInfoAllocCount, 0);
1184 atomic_set(&tconInfoAllocCount, 0);
1185 atomic_set(&tcpSesAllocCount, 0);
1186 atomic_set(&tcpSesReconnectCount, 0);
1187 atomic_set(&tconInfoReconnectCount, 0);
1188
1189 atomic_set(&bufAllocCount, 0);
1190 atomic_set(&smBufAllocCount, 0);
1191 #ifdef CONFIG_CIFS_STATS2
1192 atomic_set(&totBufAllocCount, 0);
1193 atomic_set(&totSmBufAllocCount, 0);
1194 #endif /* CONFIG_CIFS_STATS2 */
1195
1196 atomic_set(&midCount, 0);
1197 GlobalCurrentXid = 0;
1198 GlobalTotalActiveXid = 0;
1199 GlobalMaxActiveXid = 0;
1200 spin_lock_init(&cifs_tcp_ses_lock);
1201 spin_lock_init(&cifs_file_list_lock);
1202 spin_lock_init(&GlobalMid_Lock);
1203
1204 if (cifs_max_pending < 2) {
1205 cifs_max_pending = 2;
1206 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1207 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1208 cifs_max_pending = CIFS_MAX_REQ;
1209 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1210 CIFS_MAX_REQ);
1211 }
1212
1213 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1214 if (!cifsiod_wq) {
1215 rc = -ENOMEM;
1216 goto out_clean_proc;
1217 }
1218
1219 rc = cifs_fscache_register();
1220 if (rc)
1221 goto out_destroy_wq;
1222
1223 rc = cifs_init_inodecache();
1224 if (rc)
1225 goto out_unreg_fscache;
1226
1227 rc = cifs_init_mids();
1228 if (rc)
1229 goto out_destroy_inodecache;
1230
1231 rc = cifs_init_request_bufs();
1232 if (rc)
1233 goto out_destroy_mids;
1234
1235 #ifdef CONFIG_CIFS_UPCALL
1236 rc = register_key_type(&cifs_spnego_key_type);
1237 if (rc)
1238 goto out_destroy_request_bufs;
1239 #endif /* CONFIG_CIFS_UPCALL */
1240
1241 #ifdef CONFIG_CIFS_ACL
1242 rc = init_cifs_idmap();
1243 if (rc)
1244 goto out_register_key_type;
1245 #endif /* CONFIG_CIFS_ACL */
1246
1247 rc = register_filesystem(&cifs_fs_type);
1248 if (rc)
1249 goto out_init_cifs_idmap;
1250
1251 return 0;
1252
1253 out_init_cifs_idmap:
1254 #ifdef CONFIG_CIFS_ACL
1255 exit_cifs_idmap();
1256 out_register_key_type:
1257 #endif
1258 #ifdef CONFIG_CIFS_UPCALL
1259 unregister_key_type(&cifs_spnego_key_type);
1260 out_destroy_request_bufs:
1261 #endif
1262 cifs_destroy_request_bufs();
1263 out_destroy_mids:
1264 cifs_destroy_mids();
1265 out_destroy_inodecache:
1266 cifs_destroy_inodecache();
1267 out_unreg_fscache:
1268 cifs_fscache_unregister();
1269 out_destroy_wq:
1270 destroy_workqueue(cifsiod_wq);
1271 out_clean_proc:
1272 cifs_proc_clean();
1273 return rc;
1274 }
1275
1276 static void __exit
exit_cifs(void)1277 exit_cifs(void)
1278 {
1279 cifs_dbg(NOISY, "exit_cifs\n");
1280 unregister_filesystem(&cifs_fs_type);
1281 cifs_dfs_release_automount_timer();
1282 #ifdef CONFIG_CIFS_ACL
1283 exit_cifs_idmap();
1284 #endif
1285 #ifdef CONFIG_CIFS_UPCALL
1286 unregister_key_type(&cifs_spnego_key_type);
1287 #endif
1288 cifs_destroy_request_bufs();
1289 cifs_destroy_mids();
1290 cifs_destroy_inodecache();
1291 cifs_fscache_unregister();
1292 destroy_workqueue(cifsiod_wq);
1293 cifs_proc_clean();
1294 }
1295
1296 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1297 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1298 MODULE_DESCRIPTION
1299 ("VFS to access servers complying with the SNIA CIFS Specification "
1300 "e.g. Samba and Windows");
1301 MODULE_VERSION(CIFS_VERSION);
1302 module_init(init_cifs)
1303 module_exit(exit_cifs)
1304