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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
56int cifsFYI = 0;
57bool traceSMB;
58bool enable_oplocks = true;
59bool linuxExtEnabled = true;
60bool lookupCacheEnabled = true;
61unsigned int global_secflags = CIFSSEC_DEF;
62/* unsigned int ntlmv2_support = 0; */
63unsigned int sign_CIFS_PDUs = 1;
64static const struct super_operations cifs_super_ops;
65unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
66module_param(CIFSMaxBufSize, uint, 0);
67MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
68 "Default: 16384 Range: 8192 to 130048");
69unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
70module_param(cifs_min_rcv, uint, 0);
71MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
72 "1 to 64");
73unsigned int cifs_min_small = 30;
74module_param(cifs_min_small, uint, 0);
75MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
76 "Range: 2 to 256");
77unsigned int cifs_max_pending = CIFS_MAX_REQ;
78module_param(cifs_max_pending, uint, 0444);
79MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
80 "Default: 32767 Range: 2 to 32767.");
81module_param(enable_oplocks, bool, 0644);
82MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
83
84extern mempool_t *cifs_sm_req_poolp;
85extern mempool_t *cifs_req_poolp;
86extern mempool_t *cifs_mid_poolp;
87
88struct 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 */
96void
97cifs_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
105void
106cifs_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
114static int
115cifs_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
168out_no_root:
169 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
170 return rc;
171}
172
173static 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
180static int
181cifs_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
210static 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
222static 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
240static struct kmem_cache *cifs_inode_cachep;
241static struct kmem_cache *cifs_req_cachep;
242static struct kmem_cache *cifs_mid_cachep;
243static struct kmem_cache *cifs_sm_req_cachep;
244mempool_t *cifs_sm_req_poolp;
245mempool_t *cifs_req_poolp;
246mempool_t *cifs_mid_poolp;
247
248static struct inode *
249cifs_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
283static 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
289static void
290cifs_destroy_inode(struct inode *inode)
291{
292 call_rcu(&inode->i_rcu, cifs_i_callback);
293}
294
295static void
296cifs_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
303static void
304cifs_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
325static void
326cifs_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
362static void
363cifs_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
375static void
376cifs_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 */
392static int
393cifs_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 seq_printf(s, ",echo_interval=%lu",
511 tcon->ses->server->echo_interval / HZ);
512 /* convert actimeo and display it in seconds */
513 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
514
515 return 0;
516}
517
518static void cifs_umount_begin(struct super_block *sb)
519{
520 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
521 struct cifs_tcon *tcon;
522
523 if (cifs_sb == NULL)
524 return;
525
526 tcon = cifs_sb_master_tcon(cifs_sb);
527
528 spin_lock(&cifs_tcp_ses_lock);
529 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
530 /* we have other mounts to same share or we have
531 already tried to force umount this and woken up
532 all waiting network requests, nothing to do */
533 spin_unlock(&cifs_tcp_ses_lock);
534 return;
535 } else if (tcon->tc_count == 1)
536 tcon->tidStatus = CifsExiting;
537 spin_unlock(&cifs_tcp_ses_lock);
538
539 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
540 /* cancel_notify_requests(tcon); */
541 if (tcon->ses && tcon->ses->server) {
542 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
543 wake_up_all(&tcon->ses->server->request_q);
544 wake_up_all(&tcon->ses->server->response_q);
545 msleep(1); /* yield */
546 /* we have to kick the requests once more */
547 wake_up_all(&tcon->ses->server->response_q);
548 msleep(1);
549 }
550
551 return;
552}
553
554#ifdef CONFIG_CIFS_STATS2
555static int cifs_show_stats(struct seq_file *s, struct dentry *root)
556{
557 /* BB FIXME */
558 return 0;
559}
560#endif
561
562static int cifs_remount(struct super_block *sb, int *flags, char *data)
563{
564 sync_filesystem(sb);
565 *flags |= MS_NODIRATIME;
566 return 0;
567}
568
569static int cifs_drop_inode(struct inode *inode)
570{
571 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
572
573 /* no serverino => unconditional eviction */
574 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
575 generic_drop_inode(inode);
576}
577
578static const struct super_operations cifs_super_ops = {
579 .statfs = cifs_statfs,
580 .alloc_inode = cifs_alloc_inode,
581 .destroy_inode = cifs_destroy_inode,
582 .drop_inode = cifs_drop_inode,
583 .evict_inode = cifs_evict_inode,
584/* .delete_inode = cifs_delete_inode, */ /* Do not need above
585 function unless later we add lazy close of inodes or unless the
586 kernel forgets to call us with the same number of releases (closes)
587 as opens */
588 .show_options = cifs_show_options,
589 .umount_begin = cifs_umount_begin,
590 .remount_fs = cifs_remount,
591#ifdef CONFIG_CIFS_STATS2
592 .show_stats = cifs_show_stats,
593#endif
594};
595
596/*
597 * Get root dentry from superblock according to prefix path mount option.
598 * Return dentry with refcount + 1 on success and NULL otherwise.
599 */
600static struct dentry *
601cifs_get_root(struct smb_vol *vol, struct super_block *sb)
602{
603 struct dentry *dentry;
604 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
605 char *full_path = NULL;
606 char *s, *p;
607 char sep;
608
609 full_path = cifs_build_path_to_root(vol, cifs_sb,
610 cifs_sb_master_tcon(cifs_sb));
611 if (full_path == NULL)
612 return ERR_PTR(-ENOMEM);
613
614 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
615
616 sep = CIFS_DIR_SEP(cifs_sb);
617 dentry = dget(sb->s_root);
618 p = s = full_path;
619
620 do {
621 struct inode *dir = d_inode(dentry);
622 struct dentry *child;
623
624 if (!dir) {
625 dput(dentry);
626 dentry = ERR_PTR(-ENOENT);
627 break;
628 }
629 if (!S_ISDIR(dir->i_mode)) {
630 dput(dentry);
631 dentry = ERR_PTR(-ENOTDIR);
632 break;
633 }
634
635 /* skip separators */
636 while (*s == sep)
637 s++;
638 if (!*s)
639 break;
640 p = s++;
641 /* next separator */
642 while (*s && *s != sep)
643 s++;
644
645 child = lookup_one_len_unlocked(p, dentry, s - p);
646 dput(dentry);
647 dentry = child;
648 } while (!IS_ERR(dentry));
649 kfree(full_path);
650 return dentry;
651}
652
653static 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
660static struct dentry *
661cifs_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
734out_super:
735 deactivate_locked_super(sb);
736out:
737 cifs_cleanup_volume_info(volume_info);
738 return root;
739
740out_mountdata:
741 kfree(cifs_sb->mountdata);
742out_cifs_sb:
743 kfree(cifs_sb);
744out_nls:
745 unload_nls(volume_info->local_nls);
746 goto out;
747}
748
749static ssize_t
750cifs_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 if (iocb->ki_filp->f_flags & O_DIRECT)
756 return cifs_user_readv(iocb, iter);
757
758 rc = cifs_revalidate_mapping(inode);
759 if (rc)
760 return rc;
761
762 return generic_file_read_iter(iocb, iter);
763}
764
765static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
766{
767 struct inode *inode = file_inode(iocb->ki_filp);
768 struct cifsInodeInfo *cinode = CIFS_I(inode);
769 ssize_t written;
770 int rc;
771
772 if (iocb->ki_filp->f_flags & O_DIRECT) {
773 written = cifs_user_writev(iocb, from);
774 if (written > 0 && CIFS_CACHE_READ(cinode)) {
775 cifs_zap_mapping(inode);
776 cifs_dbg(FYI,
777 "Set no oplock for inode=%p after a write operation\n",
778 inode);
779 cinode->oplock = 0;
780 }
781 return written;
782 }
783
784 written = cifs_get_writer(cinode);
785 if (written)
786 return written;
787
788 written = generic_file_write_iter(iocb, from);
789
790 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
791 goto out;
792
793 rc = filemap_fdatawrite(inode->i_mapping);
794 if (rc)
795 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
796 rc, inode);
797
798out:
799 cifs_put_writer(cinode);
800 return written;
801}
802
803static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
804{
805 /*
806 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
807 * the cached file length
808 */
809 if (whence != SEEK_SET && whence != SEEK_CUR) {
810 int rc;
811 struct inode *inode = file_inode(file);
812
813 /*
814 * We need to be sure that all dirty pages are written and the
815 * server has the newest file length.
816 */
817 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
818 inode->i_mapping->nrpages != 0) {
819 rc = filemap_fdatawait(inode->i_mapping);
820 if (rc) {
821 mapping_set_error(inode->i_mapping, rc);
822 return rc;
823 }
824 }
825 /*
826 * Some applications poll for the file length in this strange
827 * way so we must seek to end on non-oplocked files by
828 * setting the revalidate time to zero.
829 */
830 CIFS_I(inode)->time = 0;
831
832 rc = cifs_revalidate_file_attr(file);
833 if (rc < 0)
834 return (loff_t)rc;
835 }
836 return generic_file_llseek(file, offset, whence);
837}
838
839static int
840cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
841{
842 /*
843 * Note that this is called by vfs setlease with i_lock held to
844 * protect *lease from going away.
845 */
846 struct inode *inode = file_inode(file);
847 struct cifsFileInfo *cfile = file->private_data;
848
849 if (!(S_ISREG(inode->i_mode)))
850 return -EINVAL;
851
852 /* Check if file is oplocked if this is request for new lease */
853 if (arg == F_UNLCK ||
854 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
855 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
856 return generic_setlease(file, arg, lease, priv);
857 else if (tlink_tcon(cfile->tlink)->local_lease &&
858 !CIFS_CACHE_READ(CIFS_I(inode)))
859 /*
860 * If the server claims to support oplock on this file, then we
861 * still need to check oplock even if the local_lease mount
862 * option is set, but there are servers which do not support
863 * oplock for which this mount option may be useful if the user
864 * knows that the file won't be changed on the server by anyone
865 * else.
866 */
867 return generic_setlease(file, arg, lease, priv);
868 else
869 return -EAGAIN;
870}
871
872struct file_system_type cifs_fs_type = {
873 .owner = THIS_MODULE,
874 .name = "cifs",
875 .mount = cifs_do_mount,
876 .kill_sb = cifs_kill_sb,
877 /* .fs_flags */
878};
879MODULE_ALIAS_FS("cifs");
880const struct inode_operations cifs_dir_inode_ops = {
881 .create = cifs_create,
882 .atomic_open = cifs_atomic_open,
883 .lookup = cifs_lookup,
884 .getattr = cifs_getattr,
885 .unlink = cifs_unlink,
886 .link = cifs_hardlink,
887 .mkdir = cifs_mkdir,
888 .rmdir = cifs_rmdir,
889 .rename2 = cifs_rename2,
890 .permission = cifs_permission,
891/* revalidate:cifs_revalidate, */
892 .setattr = cifs_setattr,
893 .symlink = cifs_symlink,
894 .mknod = cifs_mknod,
895#ifdef CONFIG_CIFS_XATTR
896 .setxattr = cifs_setxattr,
897 .getxattr = cifs_getxattr,
898 .listxattr = cifs_listxattr,
899 .removexattr = cifs_removexattr,
900#endif
901};
902
903const struct inode_operations cifs_file_inode_ops = {
904/* revalidate:cifs_revalidate, */
905 .setattr = cifs_setattr,
906 .getattr = cifs_getattr, /* do we need this anymore? */
907 .permission = cifs_permission,
908#ifdef CONFIG_CIFS_XATTR
909 .setxattr = cifs_setxattr,
910 .getxattr = cifs_getxattr,
911 .listxattr = cifs_listxattr,
912 .removexattr = cifs_removexattr,
913#endif
914};
915
916const struct inode_operations cifs_symlink_inode_ops = {
917 .readlink = generic_readlink,
918 .get_link = cifs_get_link,
919 .permission = cifs_permission,
920 /* BB add the following two eventually */
921 /* revalidate: cifs_revalidate,
922 setattr: cifs_notify_change, *//* BB do we need notify change */
923#ifdef CONFIG_CIFS_XATTR
924 .setxattr = cifs_setxattr,
925 .getxattr = cifs_getxattr,
926 .listxattr = cifs_listxattr,
927 .removexattr = cifs_removexattr,
928#endif
929};
930
931static int cifs_clone_file_range(struct file *src_file, loff_t off,
932 struct file *dst_file, loff_t destoff, u64 len)
933{
934 struct inode *src_inode = file_inode(src_file);
935 struct inode *target_inode = file_inode(dst_file);
936 struct cifsFileInfo *smb_file_src = src_file->private_data;
937 struct cifsFileInfo *smb_file_target = dst_file->private_data;
938 struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
939 unsigned int xid;
940 int rc;
941
942 cifs_dbg(FYI, "clone range\n");
943
944 xid = get_xid();
945
946 if (!src_file->private_data || !dst_file->private_data) {
947 rc = -EBADF;
948 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
949 goto out;
950 }
951
952 /*
953 * Note: cifs case is easier than btrfs since server responsible for
954 * checks for proper open modes and file type and if it wants
955 * server could even support copy of range where source = target
956 */
957 lock_two_nondirectories(target_inode, src_inode);
958
959 if (len == 0)
960 len = src_inode->i_size - off;
961
962 cifs_dbg(FYI, "about to flush pages\n");
963 /* should we flush first and last page first */
964 truncate_inode_pages_range(&target_inode->i_data, destoff,
965 PAGE_ALIGN(destoff + len)-1);
966
967 if (target_tcon->ses->server->ops->duplicate_extents)
968 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
969 smb_file_src, smb_file_target, off, len, destoff);
970 else
971 rc = -EOPNOTSUPP;
972
973 /* force revalidate of size and timestamps of target file now
974 that target is updated on the server */
975 CIFS_I(target_inode)->time = 0;
976 /* although unlocking in the reverse order from locking is not
977 strictly necessary here it is a little cleaner to be consistent */
978 unlock_two_nondirectories(src_inode, target_inode);
979out:
980 free_xid(xid);
981 return rc;
982}
983
984const struct file_operations cifs_file_ops = {
985 .read_iter = cifs_loose_read_iter,
986 .write_iter = cifs_file_write_iter,
987 .open = cifs_open,
988 .release = cifs_close,
989 .lock = cifs_lock,
990 .fsync = cifs_fsync,
991 .flush = cifs_flush,
992 .mmap = cifs_file_mmap,
993 .splice_read = generic_file_splice_read,
994 .llseek = cifs_llseek,
995 .unlocked_ioctl = cifs_ioctl,
996 .clone_file_range = cifs_clone_file_range,
997 .setlease = cifs_setlease,
998 .fallocate = cifs_fallocate,
999};
1000
1001const struct file_operations cifs_file_strict_ops = {
1002 .read_iter = cifs_strict_readv,
1003 .write_iter = cifs_strict_writev,
1004 .open = cifs_open,
1005 .release = cifs_close,
1006 .lock = cifs_lock,
1007 .fsync = cifs_strict_fsync,
1008 .flush = cifs_flush,
1009 .mmap = cifs_file_strict_mmap,
1010 .splice_read = generic_file_splice_read,
1011 .llseek = cifs_llseek,
1012 .unlocked_ioctl = cifs_ioctl,
1013 .clone_file_range = cifs_clone_file_range,
1014 .setlease = cifs_setlease,
1015 .fallocate = cifs_fallocate,
1016};
1017
1018const struct file_operations cifs_file_direct_ops = {
1019 /* BB reevaluate whether they can be done with directio, no cache */
1020 .read_iter = cifs_user_readv,
1021 .write_iter = cifs_user_writev,
1022 .open = cifs_open,
1023 .release = cifs_close,
1024 .lock = cifs_lock,
1025 .fsync = cifs_fsync,
1026 .flush = cifs_flush,
1027 .mmap = cifs_file_mmap,
1028 .splice_read = generic_file_splice_read,
1029 .unlocked_ioctl = cifs_ioctl,
1030 .clone_file_range = cifs_clone_file_range,
1031 .llseek = cifs_llseek,
1032 .setlease = cifs_setlease,
1033 .fallocate = cifs_fallocate,
1034};
1035
1036const struct file_operations cifs_file_nobrl_ops = {
1037 .read_iter = cifs_loose_read_iter,
1038 .write_iter = cifs_file_write_iter,
1039 .open = cifs_open,
1040 .release = cifs_close,
1041 .fsync = cifs_fsync,
1042 .flush = cifs_flush,
1043 .mmap = cifs_file_mmap,
1044 .splice_read = generic_file_splice_read,
1045 .llseek = cifs_llseek,
1046 .unlocked_ioctl = cifs_ioctl,
1047 .clone_file_range = cifs_clone_file_range,
1048 .setlease = cifs_setlease,
1049 .fallocate = cifs_fallocate,
1050};
1051
1052const struct file_operations cifs_file_strict_nobrl_ops = {
1053 .read_iter = cifs_strict_readv,
1054 .write_iter = cifs_strict_writev,
1055 .open = cifs_open,
1056 .release = cifs_close,
1057 .fsync = cifs_strict_fsync,
1058 .flush = cifs_flush,
1059 .mmap = cifs_file_strict_mmap,
1060 .splice_read = generic_file_splice_read,
1061 .llseek = cifs_llseek,
1062 .unlocked_ioctl = cifs_ioctl,
1063 .clone_file_range = cifs_clone_file_range,
1064 .setlease = cifs_setlease,
1065 .fallocate = cifs_fallocate,
1066};
1067
1068const struct file_operations cifs_file_direct_nobrl_ops = {
1069 /* BB reevaluate whether they can be done with directio, no cache */
1070 .read_iter = cifs_user_readv,
1071 .write_iter = cifs_user_writev,
1072 .open = cifs_open,
1073 .release = cifs_close,
1074 .fsync = cifs_fsync,
1075 .flush = cifs_flush,
1076 .mmap = cifs_file_mmap,
1077 .splice_read = generic_file_splice_read,
1078 .unlocked_ioctl = cifs_ioctl,
1079 .clone_file_range = cifs_clone_file_range,
1080 .llseek = cifs_llseek,
1081 .setlease = cifs_setlease,
1082 .fallocate = cifs_fallocate,
1083};
1084
1085const struct file_operations cifs_dir_ops = {
1086 .iterate = cifs_readdir,
1087 .release = cifs_closedir,
1088 .read = generic_read_dir,
1089 .unlocked_ioctl = cifs_ioctl,
1090 .clone_file_range = cifs_clone_file_range,
1091 .llseek = generic_file_llseek,
1092};
1093
1094static void
1095cifs_init_once(void *inode)
1096{
1097 struct cifsInodeInfo *cifsi = inode;
1098
1099 inode_init_once(&cifsi->vfs_inode);
1100 init_rwsem(&cifsi->lock_sem);
1101}
1102
1103static int __init
1104cifs_init_inodecache(void)
1105{
1106 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1107 sizeof(struct cifsInodeInfo),
1108 0, (SLAB_RECLAIM_ACCOUNT|
1109 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1110 cifs_init_once);
1111 if (cifs_inode_cachep == NULL)
1112 return -ENOMEM;
1113
1114 return 0;
1115}
1116
1117static void
1118cifs_destroy_inodecache(void)
1119{
1120 /*
1121 * Make sure all delayed rcu free inodes are flushed before we
1122 * destroy cache.
1123 */
1124 rcu_barrier();
1125 kmem_cache_destroy(cifs_inode_cachep);
1126}
1127
1128static int
1129cifs_init_request_bufs(void)
1130{
1131 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1132#ifdef CONFIG_CIFS_SMB2
1133 /*
1134 * SMB2 maximum header size is bigger than CIFS one - no problems to
1135 * allocate some more bytes for CIFS.
1136 */
1137 max_hdr_size = MAX_SMB2_HDR_SIZE;
1138#endif
1139 if (CIFSMaxBufSize < 8192) {
1140 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1141 Unicode path name has to fit in any SMB/CIFS path based frames */
1142 CIFSMaxBufSize = 8192;
1143 } else if (CIFSMaxBufSize > 1024*127) {
1144 CIFSMaxBufSize = 1024 * 127;
1145 } else {
1146 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1147 }
1148/*
1149 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1150 CIFSMaxBufSize, CIFSMaxBufSize);
1151*/
1152 cifs_req_cachep = kmem_cache_create("cifs_request",
1153 CIFSMaxBufSize + max_hdr_size, 0,
1154 SLAB_HWCACHE_ALIGN, NULL);
1155 if (cifs_req_cachep == NULL)
1156 return -ENOMEM;
1157
1158 if (cifs_min_rcv < 1)
1159 cifs_min_rcv = 1;
1160 else if (cifs_min_rcv > 64) {
1161 cifs_min_rcv = 64;
1162 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1163 }
1164
1165 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1166 cifs_req_cachep);
1167
1168 if (cifs_req_poolp == NULL) {
1169 kmem_cache_destroy(cifs_req_cachep);
1170 return -ENOMEM;
1171 }
1172 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1173 almost all handle based requests (but not write response, nor is it
1174 sufficient for path based requests). A smaller size would have
1175 been more efficient (compacting multiple slab items on one 4k page)
1176 for the case in which debug was on, but this larger size allows
1177 more SMBs to use small buffer alloc and is still much more
1178 efficient to alloc 1 per page off the slab compared to 17K (5page)
1179 alloc of large cifs buffers even when page debugging is on */
1180 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1181 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1182 NULL);
1183 if (cifs_sm_req_cachep == NULL) {
1184 mempool_destroy(cifs_req_poolp);
1185 kmem_cache_destroy(cifs_req_cachep);
1186 return -ENOMEM;
1187 }
1188
1189 if (cifs_min_small < 2)
1190 cifs_min_small = 2;
1191 else if (cifs_min_small > 256) {
1192 cifs_min_small = 256;
1193 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1194 }
1195
1196 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1197 cifs_sm_req_cachep);
1198
1199 if (cifs_sm_req_poolp == NULL) {
1200 mempool_destroy(cifs_req_poolp);
1201 kmem_cache_destroy(cifs_req_cachep);
1202 kmem_cache_destroy(cifs_sm_req_cachep);
1203 return -ENOMEM;
1204 }
1205
1206 return 0;
1207}
1208
1209static void
1210cifs_destroy_request_bufs(void)
1211{
1212 mempool_destroy(cifs_req_poolp);
1213 kmem_cache_destroy(cifs_req_cachep);
1214 mempool_destroy(cifs_sm_req_poolp);
1215 kmem_cache_destroy(cifs_sm_req_cachep);
1216}
1217
1218static int
1219cifs_init_mids(void)
1220{
1221 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1222 sizeof(struct mid_q_entry), 0,
1223 SLAB_HWCACHE_ALIGN, NULL);
1224 if (cifs_mid_cachep == NULL)
1225 return -ENOMEM;
1226
1227 /* 3 is a reasonable minimum number of simultaneous operations */
1228 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1229 if (cifs_mid_poolp == NULL) {
1230 kmem_cache_destroy(cifs_mid_cachep);
1231 return -ENOMEM;
1232 }
1233
1234 return 0;
1235}
1236
1237static void
1238cifs_destroy_mids(void)
1239{
1240 mempool_destroy(cifs_mid_poolp);
1241 kmem_cache_destroy(cifs_mid_cachep);
1242}
1243
1244static int __init
1245init_cifs(void)
1246{
1247 int rc = 0;
1248 cifs_proc_init();
1249 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1250#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1251 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1252 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1253#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1254/*
1255 * Initialize Global counters
1256 */
1257 atomic_set(&sesInfoAllocCount, 0);
1258 atomic_set(&tconInfoAllocCount, 0);
1259 atomic_set(&tcpSesAllocCount, 0);
1260 atomic_set(&tcpSesReconnectCount, 0);
1261 atomic_set(&tconInfoReconnectCount, 0);
1262
1263 atomic_set(&bufAllocCount, 0);
1264 atomic_set(&smBufAllocCount, 0);
1265#ifdef CONFIG_CIFS_STATS2
1266 atomic_set(&totBufAllocCount, 0);
1267 atomic_set(&totSmBufAllocCount, 0);
1268#endif /* CONFIG_CIFS_STATS2 */
1269
1270 atomic_set(&midCount, 0);
1271 GlobalCurrentXid = 0;
1272 GlobalTotalActiveXid = 0;
1273 GlobalMaxActiveXid = 0;
1274 spin_lock_init(&cifs_tcp_ses_lock);
1275 spin_lock_init(&cifs_file_list_lock);
1276 spin_lock_init(&GlobalMid_Lock);
1277
1278 if (cifs_max_pending < 2) {
1279 cifs_max_pending = 2;
1280 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1281 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1282 cifs_max_pending = CIFS_MAX_REQ;
1283 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1284 CIFS_MAX_REQ);
1285 }
1286
1287 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1288 if (!cifsiod_wq) {
1289 rc = -ENOMEM;
1290 goto out_clean_proc;
1291 }
1292
1293 rc = cifs_fscache_register();
1294 if (rc)
1295 goto out_destroy_wq;
1296
1297 rc = cifs_init_inodecache();
1298 if (rc)
1299 goto out_unreg_fscache;
1300
1301 rc = cifs_init_mids();
1302 if (rc)
1303 goto out_destroy_inodecache;
1304
1305 rc = cifs_init_request_bufs();
1306 if (rc)
1307 goto out_destroy_mids;
1308
1309#ifdef CONFIG_CIFS_UPCALL
1310 rc = register_key_type(&cifs_spnego_key_type);
1311 if (rc)
1312 goto out_destroy_request_bufs;
1313#endif /* CONFIG_CIFS_UPCALL */
1314
1315#ifdef CONFIG_CIFS_ACL
1316 rc = init_cifs_idmap();
1317 if (rc)
1318 goto out_register_key_type;
1319#endif /* CONFIG_CIFS_ACL */
1320
1321 rc = register_filesystem(&cifs_fs_type);
1322 if (rc)
1323 goto out_init_cifs_idmap;
1324
1325 return 0;
1326
1327out_init_cifs_idmap:
1328#ifdef CONFIG_CIFS_ACL
1329 exit_cifs_idmap();
1330out_register_key_type:
1331#endif
1332#ifdef CONFIG_CIFS_UPCALL
1333 unregister_key_type(&cifs_spnego_key_type);
1334out_destroy_request_bufs:
1335#endif
1336 cifs_destroy_request_bufs();
1337out_destroy_mids:
1338 cifs_destroy_mids();
1339out_destroy_inodecache:
1340 cifs_destroy_inodecache();
1341out_unreg_fscache:
1342 cifs_fscache_unregister();
1343out_destroy_wq:
1344 destroy_workqueue(cifsiod_wq);
1345out_clean_proc:
1346 cifs_proc_clean();
1347 return rc;
1348}
1349
1350static void __exit
1351exit_cifs(void)
1352{
1353 cifs_dbg(NOISY, "exit_cifs\n");
1354 unregister_filesystem(&cifs_fs_type);
1355 cifs_dfs_release_automount_timer();
1356#ifdef CONFIG_CIFS_ACL
1357 exit_cifs_idmap();
1358#endif
1359#ifdef CONFIG_CIFS_UPCALL
1360 unregister_key_type(&cifs_spnego_key_type);
1361#endif
1362 cifs_destroy_request_bufs();
1363 cifs_destroy_mids();
1364 cifs_destroy_inodecache();
1365 cifs_fscache_unregister();
1366 destroy_workqueue(cifsiod_wq);
1367 cifs_proc_clean();
1368}
1369
1370MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1371MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1372MODULE_DESCRIPTION
1373 ("VFS to access servers complying with the SNIA CIFS Specification "
1374 "e.g. Samba and Windows");
1375MODULE_VERSION(CIFS_VERSION);
1376module_init(init_cifs)
1377module_exit(exit_cifs)