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 return;
330
331 seq_puts(s, ",sec=");
332
333 switch (ses->sectype) {
334 case LANMAN:
335 seq_puts(s, "lanman");
336 break;
337 case NTLMv2:
338 seq_puts(s, "ntlmv2");
339 break;
340 case NTLM:
341 seq_puts(s, "ntlm");
342 break;
343 case Kerberos:
344 seq_puts(s, "krb5");
345 break;
346 case RawNTLMSSP:
347 seq_puts(s, "ntlmssp");
348 break;
349 default:
350 /* shouldn't ever happen */
351 seq_puts(s, "unknown");
352 break;
353 }
354
355 if (ses->sign)
356 seq_puts(s, "i");
357 }
358
359 static void
cifs_show_cache_flavor(struct seq_file * s,struct cifs_sb_info * cifs_sb)360 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
361 {
362 seq_puts(s, ",cache=");
363
364 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
365 seq_puts(s, "strict");
366 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
367 seq_puts(s, "none");
368 else
369 seq_puts(s, "loose");
370 }
371
372 static void
cifs_show_nls(struct seq_file * s,struct nls_table * cur)373 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
374 {
375 struct nls_table *def;
376
377 /* Display iocharset= option if it's not default charset */
378 def = load_nls_default();
379 if (def != cur)
380 seq_printf(s, ",iocharset=%s", cur->charset);
381 unload_nls(def);
382 }
383
384 /*
385 * cifs_show_options() is for displaying mount options in /proc/mounts.
386 * Not all settable options are displayed but most of the important
387 * ones are.
388 */
389 static int
cifs_show_options(struct seq_file * s,struct dentry * root)390 cifs_show_options(struct seq_file *s, struct dentry *root)
391 {
392 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
393 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
394 struct sockaddr *srcaddr;
395 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
396
397 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
398 cifs_show_security(s, tcon->ses);
399 cifs_show_cache_flavor(s, cifs_sb);
400
401 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
402 seq_puts(s, ",multiuser");
403 else if (tcon->ses->user_name)
404 seq_show_option(s, "username", tcon->ses->user_name);
405
406 if (tcon->ses->domainName)
407 seq_show_option(s, "domain", tcon->ses->domainName);
408
409 if (srcaddr->sa_family != AF_UNSPEC) {
410 struct sockaddr_in *saddr4;
411 struct sockaddr_in6 *saddr6;
412 saddr4 = (struct sockaddr_in *)srcaddr;
413 saddr6 = (struct sockaddr_in6 *)srcaddr;
414 if (srcaddr->sa_family == AF_INET6)
415 seq_printf(s, ",srcaddr=%pI6c",
416 &saddr6->sin6_addr);
417 else if (srcaddr->sa_family == AF_INET)
418 seq_printf(s, ",srcaddr=%pI4",
419 &saddr4->sin_addr.s_addr);
420 else
421 seq_printf(s, ",srcaddr=BAD-AF:%i",
422 (int)(srcaddr->sa_family));
423 }
424
425 seq_printf(s, ",uid=%u",
426 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
427 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
428 seq_puts(s, ",forceuid");
429 else
430 seq_puts(s, ",noforceuid");
431
432 seq_printf(s, ",gid=%u",
433 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
434 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
435 seq_puts(s, ",forcegid");
436 else
437 seq_puts(s, ",noforcegid");
438
439 cifs_show_address(s, tcon->ses->server);
440
441 if (!tcon->unix_ext)
442 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
443 cifs_sb->mnt_file_mode,
444 cifs_sb->mnt_dir_mode);
445
446 cifs_show_nls(s, cifs_sb->local_nls);
447
448 if (tcon->seal)
449 seq_puts(s, ",seal");
450 if (tcon->nocase)
451 seq_puts(s, ",nocase");
452 if (tcon->retry)
453 seq_puts(s, ",hard");
454 if (tcon->unix_ext)
455 seq_puts(s, ",unix");
456 else
457 seq_puts(s, ",nounix");
458 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
459 seq_puts(s, ",posixpaths");
460 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
461 seq_puts(s, ",setuids");
462 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
463 seq_puts(s, ",serverino");
464 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
465 seq_puts(s, ",rwpidforward");
466 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
467 seq_puts(s, ",forcemand");
468 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
469 seq_puts(s, ",nouser_xattr");
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
471 seq_puts(s, ",mapchars");
472 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
473 seq_puts(s, ",mapposix");
474 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
475 seq_puts(s, ",sfu");
476 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
477 seq_puts(s, ",nobrl");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
479 seq_puts(s, ",cifsacl");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
481 seq_puts(s, ",dynperm");
482 if (root->d_sb->s_flags & MS_POSIXACL)
483 seq_puts(s, ",acl");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
485 seq_puts(s, ",mfsymlinks");
486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
487 seq_puts(s, ",fsc");
488 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
489 seq_puts(s, ",nostrictsync");
490 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
491 seq_puts(s, ",noperm");
492 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
493 seq_printf(s, ",backupuid=%u",
494 from_kuid_munged(&init_user_ns,
495 cifs_sb->mnt_backupuid));
496 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
497 seq_printf(s, ",backupgid=%u",
498 from_kgid_munged(&init_user_ns,
499 cifs_sb->mnt_backupgid));
500
501 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
502 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
503 /* convert actimeo and display it in seconds */
504 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
505
506 return 0;
507 }
508
cifs_umount_begin(struct super_block * sb)509 static void cifs_umount_begin(struct super_block *sb)
510 {
511 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
512 struct cifs_tcon *tcon;
513
514 if (cifs_sb == NULL)
515 return;
516
517 tcon = cifs_sb_master_tcon(cifs_sb);
518
519 spin_lock(&cifs_tcp_ses_lock);
520 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
521 /* we have other mounts to same share or we have
522 already tried to force umount this and woken up
523 all waiting network requests, nothing to do */
524 spin_unlock(&cifs_tcp_ses_lock);
525 return;
526 } else if (tcon->tc_count == 1)
527 tcon->tidStatus = CifsExiting;
528 spin_unlock(&cifs_tcp_ses_lock);
529
530 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
531 /* cancel_notify_requests(tcon); */
532 if (tcon->ses && tcon->ses->server) {
533 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
534 wake_up_all(&tcon->ses->server->request_q);
535 wake_up_all(&tcon->ses->server->response_q);
536 msleep(1); /* yield */
537 /* we have to kick the requests once more */
538 wake_up_all(&tcon->ses->server->response_q);
539 msleep(1);
540 }
541
542 return;
543 }
544
545 #ifdef CONFIG_CIFS_STATS2
cifs_show_stats(struct seq_file * s,struct dentry * root)546 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
547 {
548 /* BB FIXME */
549 return 0;
550 }
551 #endif
552
cifs_remount(struct super_block * sb,int * flags,char * data)553 static int cifs_remount(struct super_block *sb, int *flags, char *data)
554 {
555 sync_filesystem(sb);
556 *flags |= MS_NODIRATIME;
557 return 0;
558 }
559
cifs_drop_inode(struct inode * inode)560 static int cifs_drop_inode(struct inode *inode)
561 {
562 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
563
564 /* no serverino => unconditional eviction */
565 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
566 generic_drop_inode(inode);
567 }
568
569 static const struct super_operations cifs_super_ops = {
570 .statfs = cifs_statfs,
571 .alloc_inode = cifs_alloc_inode,
572 .destroy_inode = cifs_destroy_inode,
573 .drop_inode = cifs_drop_inode,
574 .evict_inode = cifs_evict_inode,
575 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
576 function unless later we add lazy close of inodes or unless the
577 kernel forgets to call us with the same number of releases (closes)
578 as opens */
579 .show_options = cifs_show_options,
580 .umount_begin = cifs_umount_begin,
581 .remount_fs = cifs_remount,
582 #ifdef CONFIG_CIFS_STATS2
583 .show_stats = cifs_show_stats,
584 #endif
585 };
586
587 /*
588 * Get root dentry from superblock according to prefix path mount option.
589 * Return dentry with refcount + 1 on success and NULL otherwise.
590 */
591 static struct dentry *
cifs_get_root(struct smb_vol * vol,struct super_block * sb)592 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
593 {
594 struct dentry *dentry;
595 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
596 char *full_path = NULL;
597 char *s, *p;
598 char sep;
599
600 full_path = cifs_build_path_to_root(vol, cifs_sb,
601 cifs_sb_master_tcon(cifs_sb));
602 if (full_path == NULL)
603 return ERR_PTR(-ENOMEM);
604
605 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
606
607 sep = CIFS_DIR_SEP(cifs_sb);
608 dentry = dget(sb->s_root);
609 p = s = full_path;
610
611 do {
612 struct inode *dir = d_inode(dentry);
613 struct dentry *child;
614
615 if (!dir) {
616 dput(dentry);
617 dentry = ERR_PTR(-ENOENT);
618 break;
619 }
620 if (!S_ISDIR(dir->i_mode)) {
621 dput(dentry);
622 dentry = ERR_PTR(-ENOTDIR);
623 break;
624 }
625
626 /* skip separators */
627 while (*s == sep)
628 s++;
629 if (!*s)
630 break;
631 p = s++;
632 /* next separator */
633 while (*s && *s != sep)
634 s++;
635
636 mutex_lock(&dir->i_mutex);
637 child = lookup_one_len(p, dentry, s - p);
638 mutex_unlock(&dir->i_mutex);
639 dput(dentry);
640 dentry = child;
641 } while (!IS_ERR(dentry));
642 kfree(full_path);
643 return dentry;
644 }
645
cifs_set_super(struct super_block * sb,void * data)646 static int cifs_set_super(struct super_block *sb, void *data)
647 {
648 struct cifs_mnt_data *mnt_data = data;
649 sb->s_fs_info = mnt_data->cifs_sb;
650 return set_anon_super(sb, NULL);
651 }
652
653 static struct dentry *
cifs_do_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)654 cifs_do_mount(struct file_system_type *fs_type,
655 int flags, const char *dev_name, void *data)
656 {
657 int rc;
658 struct super_block *sb;
659 struct cifs_sb_info *cifs_sb;
660 struct smb_vol *volume_info;
661 struct cifs_mnt_data mnt_data;
662 struct dentry *root;
663
664 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
665
666 volume_info = cifs_get_volume_info((char *)data, dev_name);
667 if (IS_ERR(volume_info))
668 return ERR_CAST(volume_info);
669
670 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
671 if (cifs_sb == NULL) {
672 root = ERR_PTR(-ENOMEM);
673 goto out_nls;
674 }
675
676 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
677 if (cifs_sb->mountdata == NULL) {
678 root = ERR_PTR(-ENOMEM);
679 goto out_cifs_sb;
680 }
681
682 cifs_setup_cifs_sb(volume_info, cifs_sb);
683
684 rc = cifs_mount(cifs_sb, volume_info);
685 if (rc) {
686 if (!(flags & MS_SILENT))
687 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
688 rc);
689 root = ERR_PTR(rc);
690 goto out_mountdata;
691 }
692
693 mnt_data.vol = volume_info;
694 mnt_data.cifs_sb = cifs_sb;
695 mnt_data.flags = flags;
696
697 /* BB should we make this contingent on mount parm? */
698 flags |= MS_NODIRATIME | MS_NOATIME;
699
700 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
701 if (IS_ERR(sb)) {
702 root = ERR_CAST(sb);
703 cifs_umount(cifs_sb);
704 goto out;
705 }
706
707 if (sb->s_root) {
708 cifs_dbg(FYI, "Use existing superblock\n");
709 cifs_umount(cifs_sb);
710 } else {
711 rc = cifs_read_super(sb);
712 if (rc) {
713 root = ERR_PTR(rc);
714 goto out_super;
715 }
716
717 sb->s_flags |= MS_ACTIVE;
718 }
719
720 root = cifs_get_root(volume_info, sb);
721 if (IS_ERR(root))
722 goto out_super;
723
724 cifs_dbg(FYI, "dentry root is: %p\n", root);
725 goto out;
726
727 out_super:
728 deactivate_locked_super(sb);
729 out:
730 cifs_cleanup_volume_info(volume_info);
731 return root;
732
733 out_mountdata:
734 kfree(cifs_sb->mountdata);
735 out_cifs_sb:
736 kfree(cifs_sb);
737 out_nls:
738 unload_nls(volume_info->local_nls);
739 goto out;
740 }
741
742 static ssize_t
cifs_loose_read_iter(struct kiocb * iocb,struct iov_iter * iter)743 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
744 {
745 ssize_t rc;
746 struct inode *inode = file_inode(iocb->ki_filp);
747
748 rc = cifs_revalidate_mapping(inode);
749 if (rc)
750 return rc;
751
752 return generic_file_read_iter(iocb, iter);
753 }
754
cifs_file_write_iter(struct kiocb * iocb,struct iov_iter * from)755 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
756 {
757 struct inode *inode = file_inode(iocb->ki_filp);
758 struct cifsInodeInfo *cinode = CIFS_I(inode);
759 ssize_t written;
760 int rc;
761
762 written = cifs_get_writer(cinode);
763 if (written)
764 return written;
765
766 written = generic_file_write_iter(iocb, from);
767
768 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
769 goto out;
770
771 rc = filemap_fdatawrite(inode->i_mapping);
772 if (rc)
773 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
774 rc, inode);
775
776 out:
777 cifs_put_writer(cinode);
778 return written;
779 }
780
cifs_llseek(struct file * file,loff_t offset,int whence)781 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
782 {
783 /*
784 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
785 * the cached file length
786 */
787 if (whence != SEEK_SET && whence != SEEK_CUR) {
788 int rc;
789 struct inode *inode = file_inode(file);
790
791 /*
792 * We need to be sure that all dirty pages are written and the
793 * server has the newest file length.
794 */
795 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
796 inode->i_mapping->nrpages != 0) {
797 rc = filemap_fdatawait(inode->i_mapping);
798 if (rc) {
799 mapping_set_error(inode->i_mapping, rc);
800 return rc;
801 }
802 }
803 /*
804 * Some applications poll for the file length in this strange
805 * way so we must seek to end on non-oplocked files by
806 * setting the revalidate time to zero.
807 */
808 CIFS_I(inode)->time = 0;
809
810 rc = cifs_revalidate_file_attr(file);
811 if (rc < 0)
812 return (loff_t)rc;
813 }
814 return generic_file_llseek(file, offset, whence);
815 }
816
817 static int
cifs_setlease(struct file * file,long arg,struct file_lock ** lease,void ** priv)818 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
819 {
820 /*
821 * Note that this is called by vfs setlease with i_lock held to
822 * protect *lease from going away.
823 */
824 struct inode *inode = file_inode(file);
825 struct cifsFileInfo *cfile = file->private_data;
826
827 if (!(S_ISREG(inode->i_mode)))
828 return -EINVAL;
829
830 /* Check if file is oplocked if this is request for new lease */
831 if (arg == F_UNLCK ||
832 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
833 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
834 return generic_setlease(file, arg, lease, priv);
835 else if (tlink_tcon(cfile->tlink)->local_lease &&
836 !CIFS_CACHE_READ(CIFS_I(inode)))
837 /*
838 * If the server claims to support oplock on this file, then we
839 * still need to check oplock even if the local_lease mount
840 * option is set, but there are servers which do not support
841 * oplock for which this mount option may be useful if the user
842 * knows that the file won't be changed on the server by anyone
843 * else.
844 */
845 return generic_setlease(file, arg, lease, priv);
846 else
847 return -EAGAIN;
848 }
849
850 struct file_system_type cifs_fs_type = {
851 .owner = THIS_MODULE,
852 .name = "cifs",
853 .mount = cifs_do_mount,
854 .kill_sb = cifs_kill_sb,
855 /* .fs_flags */
856 };
857 MODULE_ALIAS_FS("cifs");
858 const struct inode_operations cifs_dir_inode_ops = {
859 .create = cifs_create,
860 .atomic_open = cifs_atomic_open,
861 .lookup = cifs_lookup,
862 .getattr = cifs_getattr,
863 .unlink = cifs_unlink,
864 .link = cifs_hardlink,
865 .mkdir = cifs_mkdir,
866 .rmdir = cifs_rmdir,
867 .rename2 = cifs_rename2,
868 .permission = cifs_permission,
869 /* revalidate:cifs_revalidate, */
870 .setattr = cifs_setattr,
871 .symlink = cifs_symlink,
872 .mknod = cifs_mknod,
873 #ifdef CONFIG_CIFS_XATTR
874 .setxattr = cifs_setxattr,
875 .getxattr = cifs_getxattr,
876 .listxattr = cifs_listxattr,
877 .removexattr = cifs_removexattr,
878 #endif
879 };
880
881 const struct inode_operations cifs_file_inode_ops = {
882 /* revalidate:cifs_revalidate, */
883 .setattr = cifs_setattr,
884 .getattr = cifs_getattr, /* do we need this anymore? */
885 .permission = cifs_permission,
886 #ifdef CONFIG_CIFS_XATTR
887 .setxattr = cifs_setxattr,
888 .getxattr = cifs_getxattr,
889 .listxattr = cifs_listxattr,
890 .removexattr = cifs_removexattr,
891 #endif
892 };
893
894 const struct inode_operations cifs_symlink_inode_ops = {
895 .readlink = generic_readlink,
896 .follow_link = cifs_follow_link,
897 .put_link = kfree_put_link,
898 .permission = cifs_permission,
899 /* BB add the following two eventually */
900 /* revalidate: cifs_revalidate,
901 setattr: cifs_notify_change, *//* BB do we need notify change */
902 #ifdef CONFIG_CIFS_XATTR
903 .setxattr = cifs_setxattr,
904 .getxattr = cifs_getxattr,
905 .listxattr = cifs_listxattr,
906 .removexattr = cifs_removexattr,
907 #endif
908 };
909
910 const struct file_operations cifs_file_ops = {
911 .read_iter = cifs_loose_read_iter,
912 .write_iter = cifs_file_write_iter,
913 .open = cifs_open,
914 .release = cifs_close,
915 .lock = cifs_lock,
916 .fsync = cifs_fsync,
917 .flush = cifs_flush,
918 .mmap = cifs_file_mmap,
919 .splice_read = generic_file_splice_read,
920 .llseek = cifs_llseek,
921 #ifdef CONFIG_CIFS_POSIX
922 .unlocked_ioctl = cifs_ioctl,
923 #endif /* CONFIG_CIFS_POSIX */
924 .setlease = cifs_setlease,
925 .fallocate = cifs_fallocate,
926 };
927
928 const struct file_operations cifs_file_strict_ops = {
929 .read_iter = cifs_strict_readv,
930 .write_iter = cifs_strict_writev,
931 .open = cifs_open,
932 .release = cifs_close,
933 .lock = cifs_lock,
934 .fsync = cifs_strict_fsync,
935 .flush = cifs_flush,
936 .mmap = cifs_file_strict_mmap,
937 .splice_read = generic_file_splice_read,
938 .llseek = cifs_llseek,
939 #ifdef CONFIG_CIFS_POSIX
940 .unlocked_ioctl = cifs_ioctl,
941 #endif /* CONFIG_CIFS_POSIX */
942 .setlease = cifs_setlease,
943 .fallocate = cifs_fallocate,
944 };
945
946 const struct file_operations cifs_file_direct_ops = {
947 /* BB reevaluate whether they can be done with directio, no cache */
948 .read_iter = cifs_user_readv,
949 .write_iter = cifs_user_writev,
950 .open = cifs_open,
951 .release = cifs_close,
952 .lock = cifs_lock,
953 .fsync = cifs_fsync,
954 .flush = cifs_flush,
955 .mmap = cifs_file_mmap,
956 .splice_read = generic_file_splice_read,
957 #ifdef CONFIG_CIFS_POSIX
958 .unlocked_ioctl = cifs_ioctl,
959 #endif /* CONFIG_CIFS_POSIX */
960 .llseek = cifs_llseek,
961 .setlease = cifs_setlease,
962 .fallocate = cifs_fallocate,
963 };
964
965 const struct file_operations cifs_file_nobrl_ops = {
966 .read_iter = cifs_loose_read_iter,
967 .write_iter = cifs_file_write_iter,
968 .open = cifs_open,
969 .release = cifs_close,
970 .fsync = cifs_fsync,
971 .flush = cifs_flush,
972 .mmap = cifs_file_mmap,
973 .splice_read = generic_file_splice_read,
974 .llseek = cifs_llseek,
975 #ifdef CONFIG_CIFS_POSIX
976 .unlocked_ioctl = cifs_ioctl,
977 #endif /* CONFIG_CIFS_POSIX */
978 .setlease = cifs_setlease,
979 .fallocate = cifs_fallocate,
980 };
981
982 const struct file_operations cifs_file_strict_nobrl_ops = {
983 .read_iter = cifs_strict_readv,
984 .write_iter = cifs_strict_writev,
985 .open = cifs_open,
986 .release = cifs_close,
987 .fsync = cifs_strict_fsync,
988 .flush = cifs_flush,
989 .mmap = cifs_file_strict_mmap,
990 .splice_read = generic_file_splice_read,
991 .llseek = cifs_llseek,
992 #ifdef CONFIG_CIFS_POSIX
993 .unlocked_ioctl = cifs_ioctl,
994 #endif /* CONFIG_CIFS_POSIX */
995 .setlease = cifs_setlease,
996 .fallocate = cifs_fallocate,
997 };
998
999 const struct file_operations cifs_file_direct_nobrl_ops = {
1000 /* BB reevaluate whether they can be done with directio, no cache */
1001 .read_iter = cifs_user_readv,
1002 .write_iter = cifs_user_writev,
1003 .open = cifs_open,
1004 .release = cifs_close,
1005 .fsync = cifs_fsync,
1006 .flush = cifs_flush,
1007 .mmap = cifs_file_mmap,
1008 .splice_read = generic_file_splice_read,
1009 #ifdef CONFIG_CIFS_POSIX
1010 .unlocked_ioctl = cifs_ioctl,
1011 #endif /* CONFIG_CIFS_POSIX */
1012 .llseek = cifs_llseek,
1013 .setlease = cifs_setlease,
1014 .fallocate = cifs_fallocate,
1015 };
1016
1017 const struct file_operations cifs_dir_ops = {
1018 .iterate = cifs_readdir,
1019 .release = cifs_closedir,
1020 .read = generic_read_dir,
1021 .unlocked_ioctl = cifs_ioctl,
1022 .llseek = generic_file_llseek,
1023 };
1024
1025 static void
cifs_init_once(void * inode)1026 cifs_init_once(void *inode)
1027 {
1028 struct cifsInodeInfo *cifsi = inode;
1029
1030 inode_init_once(&cifsi->vfs_inode);
1031 init_rwsem(&cifsi->lock_sem);
1032 }
1033
1034 static int __init
cifs_init_inodecache(void)1035 cifs_init_inodecache(void)
1036 {
1037 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1038 sizeof(struct cifsInodeInfo),
1039 0, (SLAB_RECLAIM_ACCOUNT|
1040 SLAB_MEM_SPREAD),
1041 cifs_init_once);
1042 if (cifs_inode_cachep == NULL)
1043 return -ENOMEM;
1044
1045 return 0;
1046 }
1047
1048 static void
cifs_destroy_inodecache(void)1049 cifs_destroy_inodecache(void)
1050 {
1051 /*
1052 * Make sure all delayed rcu free inodes are flushed before we
1053 * destroy cache.
1054 */
1055 rcu_barrier();
1056 kmem_cache_destroy(cifs_inode_cachep);
1057 }
1058
1059 static int
cifs_init_request_bufs(void)1060 cifs_init_request_bufs(void)
1061 {
1062 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1063 #ifdef CONFIG_CIFS_SMB2
1064 /*
1065 * SMB2 maximum header size is bigger than CIFS one - no problems to
1066 * allocate some more bytes for CIFS.
1067 */
1068 max_hdr_size = MAX_SMB2_HDR_SIZE;
1069 #endif
1070 if (CIFSMaxBufSize < 8192) {
1071 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1072 Unicode path name has to fit in any SMB/CIFS path based frames */
1073 CIFSMaxBufSize = 8192;
1074 } else if (CIFSMaxBufSize > 1024*127) {
1075 CIFSMaxBufSize = 1024 * 127;
1076 } else {
1077 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1078 }
1079 /*
1080 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1081 CIFSMaxBufSize, CIFSMaxBufSize);
1082 */
1083 cifs_req_cachep = kmem_cache_create("cifs_request",
1084 CIFSMaxBufSize + max_hdr_size, 0,
1085 SLAB_HWCACHE_ALIGN, NULL);
1086 if (cifs_req_cachep == NULL)
1087 return -ENOMEM;
1088
1089 if (cifs_min_rcv < 1)
1090 cifs_min_rcv = 1;
1091 else if (cifs_min_rcv > 64) {
1092 cifs_min_rcv = 64;
1093 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1094 }
1095
1096 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1097 cifs_req_cachep);
1098
1099 if (cifs_req_poolp == NULL) {
1100 kmem_cache_destroy(cifs_req_cachep);
1101 return -ENOMEM;
1102 }
1103 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1104 almost all handle based requests (but not write response, nor is it
1105 sufficient for path based requests). A smaller size would have
1106 been more efficient (compacting multiple slab items on one 4k page)
1107 for the case in which debug was on, but this larger size allows
1108 more SMBs to use small buffer alloc and is still much more
1109 efficient to alloc 1 per page off the slab compared to 17K (5page)
1110 alloc of large cifs buffers even when page debugging is on */
1111 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1112 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1113 NULL);
1114 if (cifs_sm_req_cachep == NULL) {
1115 mempool_destroy(cifs_req_poolp);
1116 kmem_cache_destroy(cifs_req_cachep);
1117 return -ENOMEM;
1118 }
1119
1120 if (cifs_min_small < 2)
1121 cifs_min_small = 2;
1122 else if (cifs_min_small > 256) {
1123 cifs_min_small = 256;
1124 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1125 }
1126
1127 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1128 cifs_sm_req_cachep);
1129
1130 if (cifs_sm_req_poolp == NULL) {
1131 mempool_destroy(cifs_req_poolp);
1132 kmem_cache_destroy(cifs_req_cachep);
1133 kmem_cache_destroy(cifs_sm_req_cachep);
1134 return -ENOMEM;
1135 }
1136
1137 return 0;
1138 }
1139
1140 static void
cifs_destroy_request_bufs(void)1141 cifs_destroy_request_bufs(void)
1142 {
1143 mempool_destroy(cifs_req_poolp);
1144 kmem_cache_destroy(cifs_req_cachep);
1145 mempool_destroy(cifs_sm_req_poolp);
1146 kmem_cache_destroy(cifs_sm_req_cachep);
1147 }
1148
1149 static int
cifs_init_mids(void)1150 cifs_init_mids(void)
1151 {
1152 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1153 sizeof(struct mid_q_entry), 0,
1154 SLAB_HWCACHE_ALIGN, NULL);
1155 if (cifs_mid_cachep == NULL)
1156 return -ENOMEM;
1157
1158 /* 3 is a reasonable minimum number of simultaneous operations */
1159 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1160 if (cifs_mid_poolp == NULL) {
1161 kmem_cache_destroy(cifs_mid_cachep);
1162 return -ENOMEM;
1163 }
1164
1165 return 0;
1166 }
1167
1168 static void
cifs_destroy_mids(void)1169 cifs_destroy_mids(void)
1170 {
1171 mempool_destroy(cifs_mid_poolp);
1172 kmem_cache_destroy(cifs_mid_cachep);
1173 }
1174
1175 static int __init
init_cifs(void)1176 init_cifs(void)
1177 {
1178 int rc = 0;
1179 cifs_proc_init();
1180 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1181 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1182 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1183 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1184 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1185 /*
1186 * Initialize Global counters
1187 */
1188 atomic_set(&sesInfoAllocCount, 0);
1189 atomic_set(&tconInfoAllocCount, 0);
1190 atomic_set(&tcpSesAllocCount, 0);
1191 atomic_set(&tcpSesReconnectCount, 0);
1192 atomic_set(&tconInfoReconnectCount, 0);
1193
1194 atomic_set(&bufAllocCount, 0);
1195 atomic_set(&smBufAllocCount, 0);
1196 #ifdef CONFIG_CIFS_STATS2
1197 atomic_set(&totBufAllocCount, 0);
1198 atomic_set(&totSmBufAllocCount, 0);
1199 #endif /* CONFIG_CIFS_STATS2 */
1200
1201 atomic_set(&midCount, 0);
1202 GlobalCurrentXid = 0;
1203 GlobalTotalActiveXid = 0;
1204 GlobalMaxActiveXid = 0;
1205 spin_lock_init(&cifs_tcp_ses_lock);
1206 spin_lock_init(&cifs_file_list_lock);
1207 spin_lock_init(&GlobalMid_Lock);
1208
1209 if (cifs_max_pending < 2) {
1210 cifs_max_pending = 2;
1211 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1212 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1213 cifs_max_pending = CIFS_MAX_REQ;
1214 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1215 CIFS_MAX_REQ);
1216 }
1217
1218 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1219 if (!cifsiod_wq) {
1220 rc = -ENOMEM;
1221 goto out_clean_proc;
1222 }
1223
1224 rc = cifs_fscache_register();
1225 if (rc)
1226 goto out_destroy_wq;
1227
1228 rc = cifs_init_inodecache();
1229 if (rc)
1230 goto out_unreg_fscache;
1231
1232 rc = cifs_init_mids();
1233 if (rc)
1234 goto out_destroy_inodecache;
1235
1236 rc = cifs_init_request_bufs();
1237 if (rc)
1238 goto out_destroy_mids;
1239
1240 #ifdef CONFIG_CIFS_UPCALL
1241 rc = init_cifs_spnego();
1242 if (rc)
1243 goto out_destroy_request_bufs;
1244 #endif /* CONFIG_CIFS_UPCALL */
1245
1246 #ifdef CONFIG_CIFS_ACL
1247 rc = init_cifs_idmap();
1248 if (rc)
1249 goto out_register_key_type;
1250 #endif /* CONFIG_CIFS_ACL */
1251
1252 rc = register_filesystem(&cifs_fs_type);
1253 if (rc)
1254 goto out_init_cifs_idmap;
1255
1256 return 0;
1257
1258 out_init_cifs_idmap:
1259 #ifdef CONFIG_CIFS_ACL
1260 exit_cifs_idmap();
1261 out_register_key_type:
1262 #endif
1263 #ifdef CONFIG_CIFS_UPCALL
1264 exit_cifs_spnego();
1265 out_destroy_request_bufs:
1266 #endif
1267 cifs_destroy_request_bufs();
1268 out_destroy_mids:
1269 cifs_destroy_mids();
1270 out_destroy_inodecache:
1271 cifs_destroy_inodecache();
1272 out_unreg_fscache:
1273 cifs_fscache_unregister();
1274 out_destroy_wq:
1275 destroy_workqueue(cifsiod_wq);
1276 out_clean_proc:
1277 cifs_proc_clean();
1278 return rc;
1279 }
1280
1281 static void __exit
exit_cifs(void)1282 exit_cifs(void)
1283 {
1284 cifs_dbg(NOISY, "exit_cifs\n");
1285 unregister_filesystem(&cifs_fs_type);
1286 cifs_dfs_release_automount_timer();
1287 #ifdef CONFIG_CIFS_ACL
1288 exit_cifs_idmap();
1289 #endif
1290 #ifdef CONFIG_CIFS_UPCALL
1291 unregister_key_type(&cifs_spnego_key_type);
1292 #endif
1293 cifs_destroy_request_bufs();
1294 cifs_destroy_mids();
1295 cifs_destroy_inodecache();
1296 cifs_fscache_unregister();
1297 destroy_workqueue(cifsiod_wq);
1298 cifs_proc_clean();
1299 }
1300
1301 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1302 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1303 MODULE_DESCRIPTION
1304 ("VFS to access servers complying with the SNIA CIFS Specification "
1305 "e.g. Samba and Windows");
1306 MODULE_VERSION(CIFS_VERSION);
1307 module_init(init_cifs)
1308 module_exit(exit_cifs)
1309