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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 <net/ipv6.h>
40#include "cifsfs.h"
41#include "cifspdu.h"
42#define DECLARE_GLOBALS_HERE
43#include "cifsglob.h"
44#include "cifsproto.h"
45#include "cifs_debug.h"
46#include "cifs_fs_sb.h"
47#include <linux/mm.h>
48#include <linux/key-type.h>
49#include "cifs_spnego.h"
50#include "fscache.h"
51#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
52
53int cifsFYI = 0;
54int cifsERROR = 1;
55int traceSMB = 0;
56bool enable_oplocks = true;
57unsigned int linuxExtEnabled = 1;
58unsigned int lookupCacheEnabled = 1;
59unsigned int global_secflags = CIFSSEC_DEF;
60/* unsigned int ntlmv2_support = 0; */
61unsigned int sign_CIFS_PDUs = 1;
62static const struct super_operations cifs_super_ops;
63unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
64module_param(CIFSMaxBufSize, int, 0);
65MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
66 "Default: 16384 Range: 8192 to 130048");
67unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
68module_param(cifs_min_rcv, int, 0);
69MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
70 "1 to 64");
71unsigned int cifs_min_small = 30;
72module_param(cifs_min_small, int, 0);
73MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
74 "Range: 2 to 256");
75unsigned int cifs_max_pending = CIFS_MAX_REQ;
76module_param(cifs_max_pending, int, 0444);
77MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
78 "Default: 32767 Range: 2 to 32767.");
79module_param(enable_oplocks, bool, 0644);
80MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks (bool). Default:"
81 "y/Y/1");
82
83extern mempool_t *cifs_sm_req_poolp;
84extern mempool_t *cifs_req_poolp;
85extern mempool_t *cifs_mid_poolp;
86
87struct workqueue_struct *cifsiod_wq;
88
89static int
90cifs_read_super(struct super_block *sb)
91{
92 struct inode *inode;
93 struct cifs_sb_info *cifs_sb;
94 int rc = 0;
95
96 cifs_sb = CIFS_SB(sb);
97
98 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
99 sb->s_flags |= MS_POSIXACL;
100
101 if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & CAP_LARGE_FILES)
102 sb->s_maxbytes = MAX_LFS_FILESIZE;
103 else
104 sb->s_maxbytes = MAX_NON_LFS;
105
106 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
107 sb->s_time_gran = 100;
108
109 sb->s_magic = CIFS_MAGIC_NUMBER;
110 sb->s_op = &cifs_super_ops;
111 sb->s_bdi = &cifs_sb->bdi;
112 sb->s_blocksize = CIFS_MAX_MSGSIZE;
113 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
114 inode = cifs_root_iget(sb);
115
116 if (IS_ERR(inode)) {
117 rc = PTR_ERR(inode);
118 goto out_no_root;
119 }
120
121 sb->s_root = d_make_root(inode);
122 if (!sb->s_root) {
123 rc = -ENOMEM;
124 goto out_no_root;
125 }
126
127 /* do that *after* d_make_root() - we want NULL ->d_op for root here */
128 if (cifs_sb_master_tcon(cifs_sb)->nocase)
129 sb->s_d_op = &cifs_ci_dentry_ops;
130 else
131 sb->s_d_op = &cifs_dentry_ops;
132
133#ifdef CONFIG_CIFS_NFSD_EXPORT
134 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
135 cFYI(1, "export ops supported");
136 sb->s_export_op = &cifs_export_ops;
137 }
138#endif /* CONFIG_CIFS_NFSD_EXPORT */
139
140 return 0;
141
142out_no_root:
143 cERROR(1, "cifs_read_super: get root inode failed");
144 return rc;
145}
146
147static void cifs_kill_sb(struct super_block *sb)
148{
149 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
150 kill_anon_super(sb);
151 cifs_umount(cifs_sb);
152}
153
154static int
155cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
156{
157 struct super_block *sb = dentry->d_sb;
158 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
159 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
160 int rc = -EOPNOTSUPP;
161 int xid;
162
163 xid = GetXid();
164
165 buf->f_type = CIFS_MAGIC_NUMBER;
166
167 /*
168 * PATH_MAX may be too long - it would presumably be total path,
169 * but note that some servers (includinng Samba 3) have a shorter
170 * maximum path.
171 *
172 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
173 */
174 buf->f_namelen = PATH_MAX;
175 buf->f_files = 0; /* undefined */
176 buf->f_ffree = 0; /* unlimited */
177
178 /*
179 * We could add a second check for a QFS Unix capability bit
180 */
181 if ((tcon->ses->capabilities & CAP_UNIX) &&
182 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
183 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
184
185 /*
186 * Only need to call the old QFSInfo if failed on newer one,
187 * e.g. by OS/2.
188 **/
189 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
190 rc = CIFSSMBQFSInfo(xid, tcon, buf);
191
192 /*
193 * Some old Windows servers also do not support level 103, retry with
194 * older level one if old server failed the previous call or we
195 * bypassed it because we detected that this was an older LANMAN sess
196 */
197 if (rc)
198 rc = SMBOldQFSInfo(xid, tcon, buf);
199
200 FreeXid(xid);
201 return 0;
202}
203
204static int cifs_permission(struct inode *inode, int mask)
205{
206 struct cifs_sb_info *cifs_sb;
207
208 cifs_sb = CIFS_SB(inode->i_sb);
209
210 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
211 if ((mask & MAY_EXEC) && !execute_ok(inode))
212 return -EACCES;
213 else
214 return 0;
215 } else /* file mode might have been restricted at mount time
216 on the client (above and beyond ACL on servers) for
217 servers which do not support setting and viewing mode bits,
218 so allowing client to check permissions is useful */
219 return generic_permission(inode, mask);
220}
221
222static struct kmem_cache *cifs_inode_cachep;
223static struct kmem_cache *cifs_req_cachep;
224static struct kmem_cache *cifs_mid_cachep;
225static struct kmem_cache *cifs_sm_req_cachep;
226mempool_t *cifs_sm_req_poolp;
227mempool_t *cifs_req_poolp;
228mempool_t *cifs_mid_poolp;
229
230static struct inode *
231cifs_alloc_inode(struct super_block *sb)
232{
233 struct cifsInodeInfo *cifs_inode;
234 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
235 if (!cifs_inode)
236 return NULL;
237 cifs_inode->cifsAttrs = 0x20; /* default */
238 cifs_inode->time = 0;
239 /* Until the file is open and we have gotten oplock
240 info back from the server, can not assume caching of
241 file data or metadata */
242 cifs_set_oplock_level(cifs_inode, 0);
243 cifs_inode->delete_pending = false;
244 cifs_inode->invalid_mapping = false;
245 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
246 cifs_inode->server_eof = 0;
247 cifs_inode->uniqueid = 0;
248 cifs_inode->createtime = 0;
249
250 /* Can not set i_flags here - they get immediately overwritten
251 to zero by the VFS */
252/* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
253 INIT_LIST_HEAD(&cifs_inode->openFileList);
254 return &cifs_inode->vfs_inode;
255}
256
257static void cifs_i_callback(struct rcu_head *head)
258{
259 struct inode *inode = container_of(head, struct inode, i_rcu);
260 INIT_LIST_HEAD(&inode->i_dentry);
261 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
262}
263
264static void
265cifs_destroy_inode(struct inode *inode)
266{
267 call_rcu(&inode->i_rcu, cifs_i_callback);
268}
269
270static void
271cifs_evict_inode(struct inode *inode)
272{
273 truncate_inode_pages(&inode->i_data, 0);
274 clear_inode(inode);
275 cifs_fscache_release_inode_cookie(inode);
276}
277
278static void
279cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
280{
281 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
282 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
283
284 seq_printf(s, ",addr=");
285
286 switch (server->dstaddr.ss_family) {
287 case AF_INET:
288 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
289 break;
290 case AF_INET6:
291 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
292 if (sa6->sin6_scope_id)
293 seq_printf(s, "%%%u", sa6->sin6_scope_id);
294 break;
295 default:
296 seq_printf(s, "(unknown)");
297 }
298}
299
300static void
301cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
302{
303 seq_printf(s, ",sec=");
304
305 switch (server->secType) {
306 case LANMAN:
307 seq_printf(s, "lanman");
308 break;
309 case NTLMv2:
310 seq_printf(s, "ntlmv2");
311 break;
312 case NTLM:
313 seq_printf(s, "ntlm");
314 break;
315 case Kerberos:
316 seq_printf(s, "krb5");
317 break;
318 case RawNTLMSSP:
319 seq_printf(s, "ntlmssp");
320 break;
321 default:
322 /* shouldn't ever happen */
323 seq_printf(s, "unknown");
324 break;
325 }
326
327 if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
328 seq_printf(s, "i");
329}
330
331static void
332cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
333{
334 seq_printf(s, ",cache=");
335
336 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
337 seq_printf(s, "strict");
338 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
339 seq_printf(s, "none");
340 else
341 seq_printf(s, "loose");
342}
343
344/*
345 * cifs_show_options() is for displaying mount options in /proc/mounts.
346 * Not all settable options are displayed but most of the important
347 * ones are.
348 */
349static int
350cifs_show_options(struct seq_file *s, struct dentry *root)
351{
352 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
353 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
354 struct sockaddr *srcaddr;
355 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
356
357 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
358 cifs_show_security(s, tcon->ses->server);
359 cifs_show_cache_flavor(s, cifs_sb);
360
361 seq_printf(s, ",unc=%s", tcon->treeName);
362
363 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
364 seq_printf(s, ",multiuser");
365 else if (tcon->ses->user_name)
366 seq_printf(s, ",username=%s", tcon->ses->user_name);
367
368 if (tcon->ses->domainName)
369 seq_printf(s, ",domain=%s", tcon->ses->domainName);
370
371 if (srcaddr->sa_family != AF_UNSPEC) {
372 struct sockaddr_in *saddr4;
373 struct sockaddr_in6 *saddr6;
374 saddr4 = (struct sockaddr_in *)srcaddr;
375 saddr6 = (struct sockaddr_in6 *)srcaddr;
376 if (srcaddr->sa_family == AF_INET6)
377 seq_printf(s, ",srcaddr=%pI6c",
378 &saddr6->sin6_addr);
379 else if (srcaddr->sa_family == AF_INET)
380 seq_printf(s, ",srcaddr=%pI4",
381 &saddr4->sin_addr.s_addr);
382 else
383 seq_printf(s, ",srcaddr=BAD-AF:%i",
384 (int)(srcaddr->sa_family));
385 }
386
387 seq_printf(s, ",uid=%u", cifs_sb->mnt_uid);
388 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
389 seq_printf(s, ",forceuid");
390 else
391 seq_printf(s, ",noforceuid");
392
393 seq_printf(s, ",gid=%u", cifs_sb->mnt_gid);
394 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
395 seq_printf(s, ",forcegid");
396 else
397 seq_printf(s, ",noforcegid");
398
399 cifs_show_address(s, tcon->ses->server);
400
401 if (!tcon->unix_ext)
402 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
403 cifs_sb->mnt_file_mode,
404 cifs_sb->mnt_dir_mode);
405 if (tcon->seal)
406 seq_printf(s, ",seal");
407 if (tcon->nocase)
408 seq_printf(s, ",nocase");
409 if (tcon->retry)
410 seq_printf(s, ",hard");
411 if (tcon->unix_ext)
412 seq_printf(s, ",unix");
413 else
414 seq_printf(s, ",nounix");
415 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
416 seq_printf(s, ",posixpaths");
417 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
418 seq_printf(s, ",setuids");
419 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
420 seq_printf(s, ",serverino");
421 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
422 seq_printf(s, ",rwpidforward");
423 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
424 seq_printf(s, ",forcemand");
425 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
426 seq_printf(s, ",nouser_xattr");
427 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
428 seq_printf(s, ",mapchars");
429 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
430 seq_printf(s, ",sfu");
431 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
432 seq_printf(s, ",nobrl");
433 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
434 seq_printf(s, ",cifsacl");
435 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
436 seq_printf(s, ",dynperm");
437 if (root->d_sb->s_flags & MS_POSIXACL)
438 seq_printf(s, ",acl");
439 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
440 seq_printf(s, ",mfsymlinks");
441 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
442 seq_printf(s, ",fsc");
443 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
444 seq_printf(s, ",nostrictsync");
445 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
446 seq_printf(s, ",noperm");
447 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
448 seq_printf(s, ",backupuid=%u", cifs_sb->mnt_backupuid);
449 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
450 seq_printf(s, ",backupgid=%u", cifs_sb->mnt_backupgid);
451
452 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
453 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
454 /* convert actimeo and display it in seconds */
455 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
456
457 return 0;
458}
459
460static void cifs_umount_begin(struct super_block *sb)
461{
462 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
463 struct cifs_tcon *tcon;
464
465 if (cifs_sb == NULL)
466 return;
467
468 tcon = cifs_sb_master_tcon(cifs_sb);
469
470 spin_lock(&cifs_tcp_ses_lock);
471 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
472 /* we have other mounts to same share or we have
473 already tried to force umount this and woken up
474 all waiting network requests, nothing to do */
475 spin_unlock(&cifs_tcp_ses_lock);
476 return;
477 } else if (tcon->tc_count == 1)
478 tcon->tidStatus = CifsExiting;
479 spin_unlock(&cifs_tcp_ses_lock);
480
481 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
482 /* cancel_notify_requests(tcon); */
483 if (tcon->ses && tcon->ses->server) {
484 cFYI(1, "wake up tasks now - umount begin not complete");
485 wake_up_all(&tcon->ses->server->request_q);
486 wake_up_all(&tcon->ses->server->response_q);
487 msleep(1); /* yield */
488 /* we have to kick the requests once more */
489 wake_up_all(&tcon->ses->server->response_q);
490 msleep(1);
491 }
492
493 return;
494}
495
496#ifdef CONFIG_CIFS_STATS2
497static int cifs_show_stats(struct seq_file *s, struct dentry *root)
498{
499 /* BB FIXME */
500 return 0;
501}
502#endif
503
504static int cifs_remount(struct super_block *sb, int *flags, char *data)
505{
506 *flags |= MS_NODIRATIME;
507 return 0;
508}
509
510static int cifs_drop_inode(struct inode *inode)
511{
512 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
513
514 /* no serverino => unconditional eviction */
515 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
516 generic_drop_inode(inode);
517}
518
519static const struct super_operations cifs_super_ops = {
520 .statfs = cifs_statfs,
521 .alloc_inode = cifs_alloc_inode,
522 .destroy_inode = cifs_destroy_inode,
523 .drop_inode = cifs_drop_inode,
524 .evict_inode = cifs_evict_inode,
525/* .delete_inode = cifs_delete_inode, */ /* Do not need above
526 function unless later we add lazy close of inodes or unless the
527 kernel forgets to call us with the same number of releases (closes)
528 as opens */
529 .show_options = cifs_show_options,
530 .umount_begin = cifs_umount_begin,
531 .remount_fs = cifs_remount,
532#ifdef CONFIG_CIFS_STATS2
533 .show_stats = cifs_show_stats,
534#endif
535};
536
537/*
538 * Get root dentry from superblock according to prefix path mount option.
539 * Return dentry with refcount + 1 on success and NULL otherwise.
540 */
541static struct dentry *
542cifs_get_root(struct smb_vol *vol, struct super_block *sb)
543{
544 struct dentry *dentry;
545 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
546 char *full_path = NULL;
547 char *s, *p;
548 char sep;
549
550 full_path = cifs_build_path_to_root(vol, cifs_sb,
551 cifs_sb_master_tcon(cifs_sb));
552 if (full_path == NULL)
553 return ERR_PTR(-ENOMEM);
554
555 cFYI(1, "Get root dentry for %s", full_path);
556
557 sep = CIFS_DIR_SEP(cifs_sb);
558 dentry = dget(sb->s_root);
559 p = s = full_path;
560
561 do {
562 struct inode *dir = dentry->d_inode;
563 struct dentry *child;
564
565 if (!dir) {
566 dput(dentry);
567 dentry = ERR_PTR(-ENOENT);
568 break;
569 }
570
571 /* skip separators */
572 while (*s == sep)
573 s++;
574 if (!*s)
575 break;
576 p = s++;
577 /* next separator */
578 while (*s && *s != sep)
579 s++;
580
581 mutex_lock(&dir->i_mutex);
582 child = lookup_one_len(p, dentry, s - p);
583 mutex_unlock(&dir->i_mutex);
584 dput(dentry);
585 dentry = child;
586 } while (!IS_ERR(dentry));
587 kfree(full_path);
588 return dentry;
589}
590
591static int cifs_set_super(struct super_block *sb, void *data)
592{
593 struct cifs_mnt_data *mnt_data = data;
594 sb->s_fs_info = mnt_data->cifs_sb;
595 return set_anon_super(sb, NULL);
596}
597
598static struct dentry *
599cifs_do_mount(struct file_system_type *fs_type,
600 int flags, const char *dev_name, void *data)
601{
602 int rc;
603 struct super_block *sb;
604 struct cifs_sb_info *cifs_sb;
605 struct smb_vol *volume_info;
606 struct cifs_mnt_data mnt_data;
607 struct dentry *root;
608
609 cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
610
611 volume_info = cifs_get_volume_info((char *)data, dev_name);
612 if (IS_ERR(volume_info))
613 return ERR_CAST(volume_info);
614
615 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
616 if (cifs_sb == NULL) {
617 root = ERR_PTR(-ENOMEM);
618 goto out_nls;
619 }
620
621 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
622 if (cifs_sb->mountdata == NULL) {
623 root = ERR_PTR(-ENOMEM);
624 goto out_cifs_sb;
625 }
626
627 cifs_setup_cifs_sb(volume_info, cifs_sb);
628
629 rc = cifs_mount(cifs_sb, volume_info);
630 if (rc) {
631 if (!(flags & MS_SILENT))
632 cERROR(1, "cifs_mount failed w/return code = %d", rc);
633 root = ERR_PTR(rc);
634 goto out_mountdata;
635 }
636
637 mnt_data.vol = volume_info;
638 mnt_data.cifs_sb = cifs_sb;
639 mnt_data.flags = flags;
640
641 sb = sget(fs_type, cifs_match_super, cifs_set_super, &mnt_data);
642 if (IS_ERR(sb)) {
643 root = ERR_CAST(sb);
644 cifs_umount(cifs_sb);
645 goto out;
646 }
647
648 if (sb->s_root) {
649 cFYI(1, "Use existing superblock");
650 cifs_umount(cifs_sb);
651 } else {
652 sb->s_flags = flags;
653 /* BB should we make this contingent on mount parm? */
654 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
655
656 rc = cifs_read_super(sb);
657 if (rc) {
658 root = ERR_PTR(rc);
659 goto out_super;
660 }
661
662 sb->s_flags |= MS_ACTIVE;
663 }
664
665 root = cifs_get_root(volume_info, sb);
666 if (IS_ERR(root))
667 goto out_super;
668
669 cFYI(1, "dentry root is: %p", root);
670 goto out;
671
672out_super:
673 deactivate_locked_super(sb);
674out:
675 cifs_cleanup_volume_info(volume_info);
676 return root;
677
678out_mountdata:
679 kfree(cifs_sb->mountdata);
680out_cifs_sb:
681 kfree(cifs_sb);
682out_nls:
683 unload_nls(volume_info->local_nls);
684 goto out;
685}
686
687static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
688 unsigned long nr_segs, loff_t pos)
689{
690 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
691 ssize_t written;
692 int rc;
693
694 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
695
696 if (CIFS_I(inode)->clientCanCacheAll)
697 return written;
698
699 rc = filemap_fdatawrite(inode->i_mapping);
700 if (rc)
701 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
702
703 return written;
704}
705
706static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
707{
708 /*
709 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
710 * the cached file length
711 */
712 if (origin != SEEK_SET && origin != SEEK_CUR) {
713 int rc;
714 struct inode *inode = file->f_path.dentry->d_inode;
715
716 /*
717 * We need to be sure that all dirty pages are written and the
718 * server has the newest file length.
719 */
720 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
721 inode->i_mapping->nrpages != 0) {
722 rc = filemap_fdatawait(inode->i_mapping);
723 if (rc) {
724 mapping_set_error(inode->i_mapping, rc);
725 return rc;
726 }
727 }
728 /*
729 * Some applications poll for the file length in this strange
730 * way so we must seek to end on non-oplocked files by
731 * setting the revalidate time to zero.
732 */
733 CIFS_I(inode)->time = 0;
734
735 rc = cifs_revalidate_file_attr(file);
736 if (rc < 0)
737 return (loff_t)rc;
738 }
739 return generic_file_llseek(file, offset, origin);
740}
741
742static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
743{
744 /* note that this is called by vfs setlease with lock_flocks held
745 to protect *lease from going away */
746 struct inode *inode = file->f_path.dentry->d_inode;
747 struct cifsFileInfo *cfile = file->private_data;
748
749 if (!(S_ISREG(inode->i_mode)))
750 return -EINVAL;
751
752 /* check if file is oplocked */
753 if (((arg == F_RDLCK) &&
754 (CIFS_I(inode)->clientCanCacheRead)) ||
755 ((arg == F_WRLCK) &&
756 (CIFS_I(inode)->clientCanCacheAll)))
757 return generic_setlease(file, arg, lease);
758 else if (tlink_tcon(cfile->tlink)->local_lease &&
759 !CIFS_I(inode)->clientCanCacheRead)
760 /* If the server claims to support oplock on this
761 file, then we still need to check oplock even
762 if the local_lease mount option is set, but there
763 are servers which do not support oplock for which
764 this mount option may be useful if the user
765 knows that the file won't be changed on the server
766 by anyone else */
767 return generic_setlease(file, arg, lease);
768 else
769 return -EAGAIN;
770}
771
772struct file_system_type cifs_fs_type = {
773 .owner = THIS_MODULE,
774 .name = "cifs",
775 .mount = cifs_do_mount,
776 .kill_sb = cifs_kill_sb,
777 /* .fs_flags */
778};
779const struct inode_operations cifs_dir_inode_ops = {
780 .create = cifs_create,
781 .lookup = cifs_lookup,
782 .getattr = cifs_getattr,
783 .unlink = cifs_unlink,
784 .link = cifs_hardlink,
785 .mkdir = cifs_mkdir,
786 .rmdir = cifs_rmdir,
787 .rename = cifs_rename,
788 .permission = cifs_permission,
789/* revalidate:cifs_revalidate, */
790 .setattr = cifs_setattr,
791 .symlink = cifs_symlink,
792 .mknod = cifs_mknod,
793#ifdef CONFIG_CIFS_XATTR
794 .setxattr = cifs_setxattr,
795 .getxattr = cifs_getxattr,
796 .listxattr = cifs_listxattr,
797 .removexattr = cifs_removexattr,
798#endif
799};
800
801const struct inode_operations cifs_file_inode_ops = {
802/* revalidate:cifs_revalidate, */
803 .setattr = cifs_setattr,
804 .getattr = cifs_getattr, /* do we need this anymore? */
805 .rename = cifs_rename,
806 .permission = cifs_permission,
807#ifdef CONFIG_CIFS_XATTR
808 .setxattr = cifs_setxattr,
809 .getxattr = cifs_getxattr,
810 .listxattr = cifs_listxattr,
811 .removexattr = cifs_removexattr,
812#endif
813};
814
815const struct inode_operations cifs_symlink_inode_ops = {
816 .readlink = generic_readlink,
817 .follow_link = cifs_follow_link,
818 .put_link = cifs_put_link,
819 .permission = cifs_permission,
820 /* BB add the following two eventually */
821 /* revalidate: cifs_revalidate,
822 setattr: cifs_notify_change, *//* BB do we need notify change */
823#ifdef CONFIG_CIFS_XATTR
824 .setxattr = cifs_setxattr,
825 .getxattr = cifs_getxattr,
826 .listxattr = cifs_listxattr,
827 .removexattr = cifs_removexattr,
828#endif
829};
830
831const struct file_operations cifs_file_ops = {
832 .read = do_sync_read,
833 .write = do_sync_write,
834 .aio_read = generic_file_aio_read,
835 .aio_write = cifs_file_aio_write,
836 .open = cifs_open,
837 .release = cifs_close,
838 .lock = cifs_lock,
839 .fsync = cifs_fsync,
840 .flush = cifs_flush,
841 .mmap = cifs_file_mmap,
842 .splice_read = generic_file_splice_read,
843 .llseek = cifs_llseek,
844#ifdef CONFIG_CIFS_POSIX
845 .unlocked_ioctl = cifs_ioctl,
846#endif /* CONFIG_CIFS_POSIX */
847 .setlease = cifs_setlease,
848};
849
850const struct file_operations cifs_file_strict_ops = {
851 .read = do_sync_read,
852 .write = do_sync_write,
853 .aio_read = cifs_strict_readv,
854 .aio_write = cifs_strict_writev,
855 .open = cifs_open,
856 .release = cifs_close,
857 .lock = cifs_lock,
858 .fsync = cifs_strict_fsync,
859 .flush = cifs_flush,
860 .mmap = cifs_file_strict_mmap,
861 .splice_read = generic_file_splice_read,
862 .llseek = cifs_llseek,
863#ifdef CONFIG_CIFS_POSIX
864 .unlocked_ioctl = cifs_ioctl,
865#endif /* CONFIG_CIFS_POSIX */
866 .setlease = cifs_setlease,
867};
868
869const struct file_operations cifs_file_direct_ops = {
870 /* BB reevaluate whether they can be done with directio, no cache */
871 .read = do_sync_read,
872 .write = do_sync_write,
873 .aio_read = cifs_user_readv,
874 .aio_write = cifs_user_writev,
875 .open = cifs_open,
876 .release = cifs_close,
877 .lock = cifs_lock,
878 .fsync = cifs_fsync,
879 .flush = cifs_flush,
880 .mmap = cifs_file_mmap,
881 .splice_read = generic_file_splice_read,
882#ifdef CONFIG_CIFS_POSIX
883 .unlocked_ioctl = cifs_ioctl,
884#endif /* CONFIG_CIFS_POSIX */
885 .llseek = cifs_llseek,
886 .setlease = cifs_setlease,
887};
888
889const struct file_operations cifs_file_nobrl_ops = {
890 .read = do_sync_read,
891 .write = do_sync_write,
892 .aio_read = generic_file_aio_read,
893 .aio_write = cifs_file_aio_write,
894 .open = cifs_open,
895 .release = cifs_close,
896 .fsync = cifs_fsync,
897 .flush = cifs_flush,
898 .mmap = cifs_file_mmap,
899 .splice_read = generic_file_splice_read,
900 .llseek = cifs_llseek,
901#ifdef CONFIG_CIFS_POSIX
902 .unlocked_ioctl = cifs_ioctl,
903#endif /* CONFIG_CIFS_POSIX */
904 .setlease = cifs_setlease,
905};
906
907const struct file_operations cifs_file_strict_nobrl_ops = {
908 .read = do_sync_read,
909 .write = do_sync_write,
910 .aio_read = cifs_strict_readv,
911 .aio_write = cifs_strict_writev,
912 .open = cifs_open,
913 .release = cifs_close,
914 .fsync = cifs_strict_fsync,
915 .flush = cifs_flush,
916 .mmap = cifs_file_strict_mmap,
917 .splice_read = generic_file_splice_read,
918 .llseek = cifs_llseek,
919#ifdef CONFIG_CIFS_POSIX
920 .unlocked_ioctl = cifs_ioctl,
921#endif /* CONFIG_CIFS_POSIX */
922 .setlease = cifs_setlease,
923};
924
925const struct file_operations cifs_file_direct_nobrl_ops = {
926 /* BB reevaluate whether they can be done with directio, no cache */
927 .read = do_sync_read,
928 .write = do_sync_write,
929 .aio_read = cifs_user_readv,
930 .aio_write = cifs_user_writev,
931 .open = cifs_open,
932 .release = cifs_close,
933 .fsync = cifs_fsync,
934 .flush = cifs_flush,
935 .mmap = cifs_file_mmap,
936 .splice_read = generic_file_splice_read,
937#ifdef CONFIG_CIFS_POSIX
938 .unlocked_ioctl = cifs_ioctl,
939#endif /* CONFIG_CIFS_POSIX */
940 .llseek = cifs_llseek,
941 .setlease = cifs_setlease,
942};
943
944const struct file_operations cifs_dir_ops = {
945 .readdir = cifs_readdir,
946 .release = cifs_closedir,
947 .read = generic_read_dir,
948 .unlocked_ioctl = cifs_ioctl,
949 .llseek = generic_file_llseek,
950};
951
952static void
953cifs_init_once(void *inode)
954{
955 struct cifsInodeInfo *cifsi = inode;
956
957 inode_init_once(&cifsi->vfs_inode);
958 mutex_init(&cifsi->lock_mutex);
959}
960
961static int
962cifs_init_inodecache(void)
963{
964 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
965 sizeof(struct cifsInodeInfo),
966 0, (SLAB_RECLAIM_ACCOUNT|
967 SLAB_MEM_SPREAD),
968 cifs_init_once);
969 if (cifs_inode_cachep == NULL)
970 return -ENOMEM;
971
972 return 0;
973}
974
975static void
976cifs_destroy_inodecache(void)
977{
978 kmem_cache_destroy(cifs_inode_cachep);
979}
980
981static int
982cifs_init_request_bufs(void)
983{
984 if (CIFSMaxBufSize < 8192) {
985 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
986 Unicode path name has to fit in any SMB/CIFS path based frames */
987 CIFSMaxBufSize = 8192;
988 } else if (CIFSMaxBufSize > 1024*127) {
989 CIFSMaxBufSize = 1024 * 127;
990 } else {
991 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
992 }
993/* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
994 cifs_req_cachep = kmem_cache_create("cifs_request",
995 CIFSMaxBufSize +
996 MAX_CIFS_HDR_SIZE, 0,
997 SLAB_HWCACHE_ALIGN, NULL);
998 if (cifs_req_cachep == NULL)
999 return -ENOMEM;
1000
1001 if (cifs_min_rcv < 1)
1002 cifs_min_rcv = 1;
1003 else if (cifs_min_rcv > 64) {
1004 cifs_min_rcv = 64;
1005 cERROR(1, "cifs_min_rcv set to maximum (64)");
1006 }
1007
1008 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1009 cifs_req_cachep);
1010
1011 if (cifs_req_poolp == NULL) {
1012 kmem_cache_destroy(cifs_req_cachep);
1013 return -ENOMEM;
1014 }
1015 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1016 almost all handle based requests (but not write response, nor is it
1017 sufficient for path based requests). A smaller size would have
1018 been more efficient (compacting multiple slab items on one 4k page)
1019 for the case in which debug was on, but this larger size allows
1020 more SMBs to use small buffer alloc and is still much more
1021 efficient to alloc 1 per page off the slab compared to 17K (5page)
1022 alloc of large cifs buffers even when page debugging is on */
1023 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1024 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1025 NULL);
1026 if (cifs_sm_req_cachep == NULL) {
1027 mempool_destroy(cifs_req_poolp);
1028 kmem_cache_destroy(cifs_req_cachep);
1029 return -ENOMEM;
1030 }
1031
1032 if (cifs_min_small < 2)
1033 cifs_min_small = 2;
1034 else if (cifs_min_small > 256) {
1035 cifs_min_small = 256;
1036 cFYI(1, "cifs_min_small set to maximum (256)");
1037 }
1038
1039 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1040 cifs_sm_req_cachep);
1041
1042 if (cifs_sm_req_poolp == NULL) {
1043 mempool_destroy(cifs_req_poolp);
1044 kmem_cache_destroy(cifs_req_cachep);
1045 kmem_cache_destroy(cifs_sm_req_cachep);
1046 return -ENOMEM;
1047 }
1048
1049 return 0;
1050}
1051
1052static void
1053cifs_destroy_request_bufs(void)
1054{
1055 mempool_destroy(cifs_req_poolp);
1056 kmem_cache_destroy(cifs_req_cachep);
1057 mempool_destroy(cifs_sm_req_poolp);
1058 kmem_cache_destroy(cifs_sm_req_cachep);
1059}
1060
1061static int
1062cifs_init_mids(void)
1063{
1064 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1065 sizeof(struct mid_q_entry), 0,
1066 SLAB_HWCACHE_ALIGN, NULL);
1067 if (cifs_mid_cachep == NULL)
1068 return -ENOMEM;
1069
1070 /* 3 is a reasonable minimum number of simultaneous operations */
1071 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1072 if (cifs_mid_poolp == NULL) {
1073 kmem_cache_destroy(cifs_mid_cachep);
1074 return -ENOMEM;
1075 }
1076
1077 return 0;
1078}
1079
1080static void
1081cifs_destroy_mids(void)
1082{
1083 mempool_destroy(cifs_mid_poolp);
1084 kmem_cache_destroy(cifs_mid_cachep);
1085}
1086
1087static int __init
1088init_cifs(void)
1089{
1090 int rc = 0;
1091 cifs_proc_init();
1092 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1093#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1094 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1095 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1096#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1097/*
1098 * Initialize Global counters
1099 */
1100 atomic_set(&sesInfoAllocCount, 0);
1101 atomic_set(&tconInfoAllocCount, 0);
1102 atomic_set(&tcpSesAllocCount, 0);
1103 atomic_set(&tcpSesReconnectCount, 0);
1104 atomic_set(&tconInfoReconnectCount, 0);
1105
1106 atomic_set(&bufAllocCount, 0);
1107 atomic_set(&smBufAllocCount, 0);
1108#ifdef CONFIG_CIFS_STATS2
1109 atomic_set(&totBufAllocCount, 0);
1110 atomic_set(&totSmBufAllocCount, 0);
1111#endif /* CONFIG_CIFS_STATS2 */
1112
1113 atomic_set(&midCount, 0);
1114 GlobalCurrentXid = 0;
1115 GlobalTotalActiveXid = 0;
1116 GlobalMaxActiveXid = 0;
1117 spin_lock_init(&cifs_tcp_ses_lock);
1118 spin_lock_init(&cifs_file_list_lock);
1119 spin_lock_init(&GlobalMid_Lock);
1120
1121 if (cifs_max_pending < 2) {
1122 cifs_max_pending = 2;
1123 cFYI(1, "cifs_max_pending set to min of 2");
1124 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1125 cifs_max_pending = CIFS_MAX_REQ;
1126 cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ);
1127 }
1128
1129 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1130 if (!cifsiod_wq) {
1131 rc = -ENOMEM;
1132 goto out_clean_proc;
1133 }
1134
1135 rc = cifs_fscache_register();
1136 if (rc)
1137 goto out_destroy_wq;
1138
1139 rc = cifs_init_inodecache();
1140 if (rc)
1141 goto out_unreg_fscache;
1142
1143 rc = cifs_init_mids();
1144 if (rc)
1145 goto out_destroy_inodecache;
1146
1147 rc = cifs_init_request_bufs();
1148 if (rc)
1149 goto out_destroy_mids;
1150
1151#ifdef CONFIG_CIFS_UPCALL
1152 rc = register_key_type(&cifs_spnego_key_type);
1153 if (rc)
1154 goto out_destroy_request_bufs;
1155#endif /* CONFIG_CIFS_UPCALL */
1156
1157#ifdef CONFIG_CIFS_ACL
1158 rc = init_cifs_idmap();
1159 if (rc)
1160 goto out_register_key_type;
1161#endif /* CONFIG_CIFS_ACL */
1162
1163 rc = register_filesystem(&cifs_fs_type);
1164 if (rc)
1165 goto out_init_cifs_idmap;
1166
1167 return 0;
1168
1169out_init_cifs_idmap:
1170#ifdef CONFIG_CIFS_ACL
1171 exit_cifs_idmap();
1172out_register_key_type:
1173#endif
1174#ifdef CONFIG_CIFS_UPCALL
1175 unregister_key_type(&cifs_spnego_key_type);
1176out_destroy_request_bufs:
1177#endif
1178 cifs_destroy_request_bufs();
1179out_destroy_mids:
1180 cifs_destroy_mids();
1181out_destroy_inodecache:
1182 cifs_destroy_inodecache();
1183out_unreg_fscache:
1184 cifs_fscache_unregister();
1185out_destroy_wq:
1186 destroy_workqueue(cifsiod_wq);
1187out_clean_proc:
1188 cifs_proc_clean();
1189 return rc;
1190}
1191
1192static void __exit
1193exit_cifs(void)
1194{
1195 cFYI(DBG2, "exit_cifs");
1196 unregister_filesystem(&cifs_fs_type);
1197 cifs_dfs_release_automount_timer();
1198#ifdef CONFIG_CIFS_ACL
1199 cifs_destroy_idmaptrees();
1200 exit_cifs_idmap();
1201#endif
1202#ifdef CONFIG_CIFS_UPCALL
1203 unregister_key_type(&cifs_spnego_key_type);
1204#endif
1205 cifs_destroy_request_bufs();
1206 cifs_destroy_mids();
1207 cifs_destroy_inodecache();
1208 cifs_fscache_unregister();
1209 destroy_workqueue(cifsiod_wq);
1210 cifs_proc_clean();
1211}
1212
1213MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1214MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1215MODULE_DESCRIPTION
1216 ("VFS to access servers complying with the SNIA CIFS Specification "
1217 "e.g. Samba and Windows");
1218MODULE_VERSION(CIFS_VERSION);
1219module_init(init_cifs)
1220module_exit(exit_cifs)