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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)
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;
57int traceSMB = 0;
58bool enable_oplocks = true;
59unsigned int linuxExtEnabled = 1;
60unsigned int lookupCacheEnabled = 1;
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#ifdef CONFIG_CIFS_SMB2
91__u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
92#endif
93
94/*
95 * Bumps refcount for cifs super block.
96 * Note that it should be only called if a referece to VFS super block is
97 * already held, e.g. in open-type syscalls context. Otherwise it can race with
98 * atomic_dec_and_test in deactivate_locked_super.
99 */
100void
101cifs_sb_active(struct super_block *sb)
102{
103 struct cifs_sb_info *server = CIFS_SB(sb);
104
105 if (atomic_inc_return(&server->active) == 1)
106 atomic_inc(&sb->s_active);
107}
108
109void
110cifs_sb_deactive(struct super_block *sb)
111{
112 struct cifs_sb_info *server = CIFS_SB(sb);
113
114 if (atomic_dec_and_test(&server->active))
115 deactivate_super(sb);
116}
117
118static int
119cifs_read_super(struct super_block *sb)
120{
121 struct inode *inode;
122 struct cifs_sb_info *cifs_sb;
123 struct cifs_tcon *tcon;
124 int rc = 0;
125
126 cifs_sb = CIFS_SB(sb);
127 tcon = cifs_sb_master_tcon(cifs_sb);
128
129 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
130 sb->s_flags |= MS_POSIXACL;
131
132 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
133 sb->s_maxbytes = MAX_LFS_FILESIZE;
134 else
135 sb->s_maxbytes = MAX_NON_LFS;
136
137 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
138 sb->s_time_gran = 100;
139
140 sb->s_magic = CIFS_MAGIC_NUMBER;
141 sb->s_op = &cifs_super_ops;
142 sb->s_bdi = &cifs_sb->bdi;
143 sb->s_blocksize = CIFS_MAX_MSGSIZE;
144 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
145 inode = cifs_root_iget(sb);
146
147 if (IS_ERR(inode)) {
148 rc = PTR_ERR(inode);
149 goto out_no_root;
150 }
151
152 if (tcon->nocase)
153 sb->s_d_op = &cifs_ci_dentry_ops;
154 else
155 sb->s_d_op = &cifs_dentry_ops;
156
157 sb->s_root = d_make_root(inode);
158 if (!sb->s_root) {
159 rc = -ENOMEM;
160 goto out_no_root;
161 }
162
163#ifdef CONFIG_CIFS_NFSD_EXPORT
164 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
165 cifs_dbg(FYI, "export ops supported\n");
166 sb->s_export_op = &cifs_export_ops;
167 }
168#endif /* CONFIG_CIFS_NFSD_EXPORT */
169
170 return 0;
171
172out_no_root:
173 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
174 return rc;
175}
176
177static void cifs_kill_sb(struct super_block *sb)
178{
179 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
180 kill_anon_super(sb);
181 cifs_umount(cifs_sb);
182}
183
184static int
185cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
186{
187 struct super_block *sb = dentry->d_sb;
188 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
189 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
190 struct TCP_Server_Info *server = tcon->ses->server;
191 unsigned int xid;
192 int rc = 0;
193
194 xid = get_xid();
195
196 /*
197 * PATH_MAX may be too long - it would presumably be total path,
198 * but note that some servers (includinng Samba 3) have a shorter
199 * maximum path.
200 *
201 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
202 */
203 buf->f_namelen = PATH_MAX;
204 buf->f_files = 0; /* undefined */
205 buf->f_ffree = 0; /* unlimited */
206
207 if (server->ops->queryfs)
208 rc = server->ops->queryfs(xid, tcon, buf);
209
210 free_xid(xid);
211 return 0;
212}
213
214static int cifs_permission(struct inode *inode, int mask)
215{
216 struct cifs_sb_info *cifs_sb;
217
218 cifs_sb = CIFS_SB(inode->i_sb);
219
220 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
221 if ((mask & MAY_EXEC) && !execute_ok(inode))
222 return -EACCES;
223 else
224 return 0;
225 } else /* file mode might have been restricted at mount time
226 on the client (above and beyond ACL on servers) for
227 servers which do not support setting and viewing mode bits,
228 so allowing client to check permissions is useful */
229 return generic_permission(inode, mask);
230}
231
232static struct kmem_cache *cifs_inode_cachep;
233static struct kmem_cache *cifs_req_cachep;
234static struct kmem_cache *cifs_mid_cachep;
235static struct kmem_cache *cifs_sm_req_cachep;
236mempool_t *cifs_sm_req_poolp;
237mempool_t *cifs_req_poolp;
238mempool_t *cifs_mid_poolp;
239
240static struct inode *
241cifs_alloc_inode(struct super_block *sb)
242{
243 struct cifsInodeInfo *cifs_inode;
244 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
245 if (!cifs_inode)
246 return NULL;
247 cifs_inode->cifsAttrs = 0x20; /* default */
248 cifs_inode->time = 0;
249 /*
250 * Until the file is open and we have gotten oplock info back from the
251 * server, can not assume caching of file data or metadata.
252 */
253 cifs_set_oplock_level(cifs_inode, 0);
254 cifs_inode->delete_pending = false;
255 cifs_inode->invalid_mapping = false;
256 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cifs_inode->flags);
257 clear_bit(CIFS_INODE_PENDING_WRITERS, &cifs_inode->flags);
258 clear_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, &cifs_inode->flags);
259 spin_lock_init(&cifs_inode->writers_lock);
260 cifs_inode->writers = 0;
261 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
262 cifs_inode->server_eof = 0;
263 cifs_inode->uniqueid = 0;
264 cifs_inode->createtime = 0;
265 cifs_inode->epoch = 0;
266#ifdef CONFIG_CIFS_SMB2
267 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
268#endif
269 /*
270 * Can not set i_flags here - they get immediately overwritten to zero
271 * by the VFS.
272 */
273 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
274 INIT_LIST_HEAD(&cifs_inode->openFileList);
275 INIT_LIST_HEAD(&cifs_inode->llist);
276 return &cifs_inode->vfs_inode;
277}
278
279static void cifs_i_callback(struct rcu_head *head)
280{
281 struct inode *inode = container_of(head, struct inode, i_rcu);
282 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
283}
284
285static void
286cifs_destroy_inode(struct inode *inode)
287{
288 call_rcu(&inode->i_rcu, cifs_i_callback);
289}
290
291static void
292cifs_evict_inode(struct inode *inode)
293{
294 truncate_inode_pages_final(&inode->i_data);
295 clear_inode(inode);
296 cifs_fscache_release_inode_cookie(inode);
297}
298
299static void
300cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
301{
302 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
303 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
304
305 seq_printf(s, ",addr=");
306
307 switch (server->dstaddr.ss_family) {
308 case AF_INET:
309 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
310 break;
311 case AF_INET6:
312 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
313 if (sa6->sin6_scope_id)
314 seq_printf(s, "%%%u", sa6->sin6_scope_id);
315 break;
316 default:
317 seq_printf(s, "(unknown)");
318 }
319}
320
321static void
322cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
323{
324 if (ses->sectype == Unspecified)
325 return;
326
327 seq_printf(s, ",sec=");
328
329 switch (ses->sectype) {
330 case LANMAN:
331 seq_printf(s, "lanman");
332 break;
333 case NTLMv2:
334 seq_printf(s, "ntlmv2");
335 break;
336 case NTLM:
337 seq_printf(s, "ntlm");
338 break;
339 case Kerberos:
340 seq_printf(s, "krb5");
341 break;
342 case RawNTLMSSP:
343 seq_printf(s, "ntlmssp");
344 break;
345 default:
346 /* shouldn't ever happen */
347 seq_printf(s, "unknown");
348 break;
349 }
350
351 if (ses->sign)
352 seq_printf(s, "i");
353}
354
355static void
356cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
357{
358 seq_printf(s, ",cache=");
359
360 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
361 seq_printf(s, "strict");
362 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
363 seq_printf(s, "none");
364 else
365 seq_printf(s, "loose");
366}
367
368static void
369cifs_show_nls(struct seq_file *s, struct nls_table *cur)
370{
371 struct nls_table *def;
372
373 /* Display iocharset= option if it's not default charset */
374 def = load_nls_default();
375 if (def != cur)
376 seq_printf(s, ",iocharset=%s", cur->charset);
377 unload_nls(def);
378}
379
380/*
381 * cifs_show_options() is for displaying mount options in /proc/mounts.
382 * Not all settable options are displayed but most of the important
383 * ones are.
384 */
385static int
386cifs_show_options(struct seq_file *s, struct dentry *root)
387{
388 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
389 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
390 struct sockaddr *srcaddr;
391 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
392
393 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
394 cifs_show_security(s, tcon->ses);
395 cifs_show_cache_flavor(s, cifs_sb);
396
397 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
398 seq_printf(s, ",multiuser");
399 else if (tcon->ses->user_name)
400 seq_printf(s, ",username=%s", tcon->ses->user_name);
401
402 if (tcon->ses->domainName)
403 seq_printf(s, ",domain=%s", tcon->ses->domainName);
404
405 if (srcaddr->sa_family != AF_UNSPEC) {
406 struct sockaddr_in *saddr4;
407 struct sockaddr_in6 *saddr6;
408 saddr4 = (struct sockaddr_in *)srcaddr;
409 saddr6 = (struct sockaddr_in6 *)srcaddr;
410 if (srcaddr->sa_family == AF_INET6)
411 seq_printf(s, ",srcaddr=%pI6c",
412 &saddr6->sin6_addr);
413 else if (srcaddr->sa_family == AF_INET)
414 seq_printf(s, ",srcaddr=%pI4",
415 &saddr4->sin_addr.s_addr);
416 else
417 seq_printf(s, ",srcaddr=BAD-AF:%i",
418 (int)(srcaddr->sa_family));
419 }
420
421 seq_printf(s, ",uid=%u",
422 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
423 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
424 seq_printf(s, ",forceuid");
425 else
426 seq_printf(s, ",noforceuid");
427
428 seq_printf(s, ",gid=%u",
429 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
430 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
431 seq_printf(s, ",forcegid");
432 else
433 seq_printf(s, ",noforcegid");
434
435 cifs_show_address(s, tcon->ses->server);
436
437 if (!tcon->unix_ext)
438 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
439 cifs_sb->mnt_file_mode,
440 cifs_sb->mnt_dir_mode);
441
442 cifs_show_nls(s, cifs_sb->local_nls);
443
444 if (tcon->seal)
445 seq_printf(s, ",seal");
446 if (tcon->nocase)
447 seq_printf(s, ",nocase");
448 if (tcon->retry)
449 seq_printf(s, ",hard");
450 if (tcon->unix_ext)
451 seq_printf(s, ",unix");
452 else
453 seq_printf(s, ",nounix");
454 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
455 seq_printf(s, ",posixpaths");
456 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
457 seq_printf(s, ",setuids");
458 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
459 seq_printf(s, ",serverino");
460 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
461 seq_printf(s, ",rwpidforward");
462 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
463 seq_printf(s, ",forcemand");
464 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
465 seq_printf(s, ",nouser_xattr");
466 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
467 seq_printf(s, ",mapchars");
468 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
469 seq_printf(s, ",sfu");
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
471 seq_printf(s, ",nobrl");
472 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
473 seq_printf(s, ",cifsacl");
474 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
475 seq_printf(s, ",dynperm");
476 if (root->d_sb->s_flags & MS_POSIXACL)
477 seq_printf(s, ",acl");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
479 seq_printf(s, ",mfsymlinks");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
481 seq_printf(s, ",fsc");
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
483 seq_printf(s, ",nostrictsync");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
485 seq_printf(s, ",noperm");
486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
487 seq_printf(s, ",backupuid=%u",
488 from_kuid_munged(&init_user_ns,
489 cifs_sb->mnt_backupuid));
490 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
491 seq_printf(s, ",backupgid=%u",
492 from_kgid_munged(&init_user_ns,
493 cifs_sb->mnt_backupgid));
494
495 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
496 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
497 /* convert actimeo and display it in seconds */
498 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
499
500 return 0;
501}
502
503static void cifs_umount_begin(struct super_block *sb)
504{
505 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
506 struct cifs_tcon *tcon;
507
508 if (cifs_sb == NULL)
509 return;
510
511 tcon = cifs_sb_master_tcon(cifs_sb);
512
513 spin_lock(&cifs_tcp_ses_lock);
514 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
515 /* we have other mounts to same share or we have
516 already tried to force umount this and woken up
517 all waiting network requests, nothing to do */
518 spin_unlock(&cifs_tcp_ses_lock);
519 return;
520 } else if (tcon->tc_count == 1)
521 tcon->tidStatus = CifsExiting;
522 spin_unlock(&cifs_tcp_ses_lock);
523
524 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
525 /* cancel_notify_requests(tcon); */
526 if (tcon->ses && tcon->ses->server) {
527 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
528 wake_up_all(&tcon->ses->server->request_q);
529 wake_up_all(&tcon->ses->server->response_q);
530 msleep(1); /* yield */
531 /* we have to kick the requests once more */
532 wake_up_all(&tcon->ses->server->response_q);
533 msleep(1);
534 }
535
536 return;
537}
538
539#ifdef CONFIG_CIFS_STATS2
540static int cifs_show_stats(struct seq_file *s, struct dentry *root)
541{
542 /* BB FIXME */
543 return 0;
544}
545#endif
546
547static int cifs_remount(struct super_block *sb, int *flags, char *data)
548{
549 sync_filesystem(sb);
550 *flags |= MS_NODIRATIME;
551 return 0;
552}
553
554static int cifs_drop_inode(struct inode *inode)
555{
556 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
557
558 /* no serverino => unconditional eviction */
559 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
560 generic_drop_inode(inode);
561}
562
563static const struct super_operations cifs_super_ops = {
564 .statfs = cifs_statfs,
565 .alloc_inode = cifs_alloc_inode,
566 .destroy_inode = cifs_destroy_inode,
567 .drop_inode = cifs_drop_inode,
568 .evict_inode = cifs_evict_inode,
569/* .delete_inode = cifs_delete_inode, */ /* Do not need above
570 function unless later we add lazy close of inodes or unless the
571 kernel forgets to call us with the same number of releases (closes)
572 as opens */
573 .show_options = cifs_show_options,
574 .umount_begin = cifs_umount_begin,
575 .remount_fs = cifs_remount,
576#ifdef CONFIG_CIFS_STATS2
577 .show_stats = cifs_show_stats,
578#endif
579};
580
581/*
582 * Get root dentry from superblock according to prefix path mount option.
583 * Return dentry with refcount + 1 on success and NULL otherwise.
584 */
585static struct dentry *
586cifs_get_root(struct smb_vol *vol, struct super_block *sb)
587{
588 struct dentry *dentry;
589 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
590 char *full_path = NULL;
591 char *s, *p;
592 char sep;
593
594 full_path = cifs_build_path_to_root(vol, cifs_sb,
595 cifs_sb_master_tcon(cifs_sb));
596 if (full_path == NULL)
597 return ERR_PTR(-ENOMEM);
598
599 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
600
601 sep = CIFS_DIR_SEP(cifs_sb);
602 dentry = dget(sb->s_root);
603 p = s = full_path;
604
605 do {
606 struct inode *dir = dentry->d_inode;
607 struct dentry *child;
608
609 if (!dir) {
610 dput(dentry);
611 dentry = ERR_PTR(-ENOENT);
612 break;
613 }
614 if (!S_ISDIR(dir->i_mode)) {
615 dput(dentry);
616 dentry = ERR_PTR(-ENOTDIR);
617 break;
618 }
619
620 /* skip separators */
621 while (*s == sep)
622 s++;
623 if (!*s)
624 break;
625 p = s++;
626 /* next separator */
627 while (*s && *s != sep)
628 s++;
629
630 mutex_lock(&dir->i_mutex);
631 child = lookup_one_len(p, dentry, s - p);
632 mutex_unlock(&dir->i_mutex);
633 dput(dentry);
634 dentry = child;
635 } while (!IS_ERR(dentry));
636 kfree(full_path);
637 return dentry;
638}
639
640static int cifs_set_super(struct super_block *sb, void *data)
641{
642 struct cifs_mnt_data *mnt_data = data;
643 sb->s_fs_info = mnt_data->cifs_sb;
644 return set_anon_super(sb, NULL);
645}
646
647static struct dentry *
648cifs_do_mount(struct file_system_type *fs_type,
649 int flags, const char *dev_name, void *data)
650{
651 int rc;
652 struct super_block *sb;
653 struct cifs_sb_info *cifs_sb;
654 struct smb_vol *volume_info;
655 struct cifs_mnt_data mnt_data;
656 struct dentry *root;
657
658 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
659
660 volume_info = cifs_get_volume_info((char *)data, dev_name);
661 if (IS_ERR(volume_info))
662 return ERR_CAST(volume_info);
663
664 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
665 if (cifs_sb == NULL) {
666 root = ERR_PTR(-ENOMEM);
667 goto out_nls;
668 }
669
670 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
671 if (cifs_sb->mountdata == NULL) {
672 root = ERR_PTR(-ENOMEM);
673 goto out_cifs_sb;
674 }
675
676 cifs_setup_cifs_sb(volume_info, cifs_sb);
677
678 rc = cifs_mount(cifs_sb, volume_info);
679 if (rc) {
680 if (!(flags & MS_SILENT))
681 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
682 rc);
683 root = ERR_PTR(rc);
684 goto out_mountdata;
685 }
686
687 mnt_data.vol = volume_info;
688 mnt_data.cifs_sb = cifs_sb;
689 mnt_data.flags = flags;
690
691 /* BB should we make this contingent on mount parm? */
692 flags |= MS_NODIRATIME | MS_NOATIME;
693
694 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
695 if (IS_ERR(sb)) {
696 root = ERR_CAST(sb);
697 cifs_umount(cifs_sb);
698 goto out;
699 }
700
701 if (sb->s_root) {
702 cifs_dbg(FYI, "Use existing superblock\n");
703 cifs_umount(cifs_sb);
704 } else {
705 rc = cifs_read_super(sb);
706 if (rc) {
707 root = ERR_PTR(rc);
708 goto out_super;
709 }
710
711 sb->s_flags |= MS_ACTIVE;
712 }
713
714 root = cifs_get_root(volume_info, sb);
715 if (IS_ERR(root))
716 goto out_super;
717
718 cifs_dbg(FYI, "dentry root is: %p\n", root);
719 goto out;
720
721out_super:
722 deactivate_locked_super(sb);
723out:
724 cifs_cleanup_volume_info(volume_info);
725 return root;
726
727out_mountdata:
728 kfree(cifs_sb->mountdata);
729out_cifs_sb:
730 kfree(cifs_sb);
731out_nls:
732 unload_nls(volume_info->local_nls);
733 goto out;
734}
735
736static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
737 unsigned long nr_segs, loff_t pos)
738{
739 struct inode *inode = file_inode(iocb->ki_filp);
740 struct cifsInodeInfo *cinode = CIFS_I(inode);
741 ssize_t written;
742 int rc;
743
744 written = cifs_get_writer(cinode);
745 if (written)
746 return written;
747
748 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
749
750 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
751 goto out;
752
753 rc = filemap_fdatawrite(inode->i_mapping);
754 if (rc)
755 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
756 rc, inode);
757
758out:
759 cifs_put_writer(cinode);
760 return written;
761}
762
763static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
764{
765 /*
766 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
767 * the cached file length
768 */
769 if (whence != SEEK_SET && whence != SEEK_CUR) {
770 int rc;
771 struct inode *inode = file_inode(file);
772
773 /*
774 * We need to be sure that all dirty pages are written and the
775 * server has the newest file length.
776 */
777 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
778 inode->i_mapping->nrpages != 0) {
779 rc = filemap_fdatawait(inode->i_mapping);
780 if (rc) {
781 mapping_set_error(inode->i_mapping, rc);
782 return rc;
783 }
784 }
785 /*
786 * Some applications poll for the file length in this strange
787 * way so we must seek to end on non-oplocked files by
788 * setting the revalidate time to zero.
789 */
790 CIFS_I(inode)->time = 0;
791
792 rc = cifs_revalidate_file_attr(file);
793 if (rc < 0)
794 return (loff_t)rc;
795 }
796 return generic_file_llseek(file, offset, whence);
797}
798
799static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
800{
801 /*
802 * Note that this is called by vfs setlease with i_lock held to
803 * protect *lease from going away.
804 */
805 struct inode *inode = file_inode(file);
806 struct cifsFileInfo *cfile = file->private_data;
807
808 if (!(S_ISREG(inode->i_mode)))
809 return -EINVAL;
810
811 /* check if file is oplocked */
812 if (((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
813 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
814 return generic_setlease(file, arg, lease);
815 else if (tlink_tcon(cfile->tlink)->local_lease &&
816 !CIFS_CACHE_READ(CIFS_I(inode)))
817 /*
818 * If the server claims to support oplock on this file, then we
819 * still need to check oplock even if the local_lease mount
820 * option is set, but there are servers which do not support
821 * oplock for which this mount option may be useful if the user
822 * knows that the file won't be changed on the server by anyone
823 * else.
824 */
825 return generic_setlease(file, arg, lease);
826 else
827 return -EAGAIN;
828}
829
830struct file_system_type cifs_fs_type = {
831 .owner = THIS_MODULE,
832 .name = "cifs",
833 .mount = cifs_do_mount,
834 .kill_sb = cifs_kill_sb,
835 /* .fs_flags */
836};
837MODULE_ALIAS_FS("cifs");
838const struct inode_operations cifs_dir_inode_ops = {
839 .create = cifs_create,
840 .atomic_open = cifs_atomic_open,
841 .lookup = cifs_lookup,
842 .getattr = cifs_getattr,
843 .unlink = cifs_unlink,
844 .link = cifs_hardlink,
845 .mkdir = cifs_mkdir,
846 .rmdir = cifs_rmdir,
847 .rename = cifs_rename,
848 .permission = cifs_permission,
849/* revalidate:cifs_revalidate, */
850 .setattr = cifs_setattr,
851 .symlink = cifs_symlink,
852 .mknod = cifs_mknod,
853#ifdef CONFIG_CIFS_XATTR
854 .setxattr = cifs_setxattr,
855 .getxattr = cifs_getxattr,
856 .listxattr = cifs_listxattr,
857 .removexattr = cifs_removexattr,
858#endif
859};
860
861const struct inode_operations cifs_file_inode_ops = {
862/* revalidate:cifs_revalidate, */
863 .setattr = cifs_setattr,
864 .getattr = cifs_getattr, /* do we need this anymore? */
865 .permission = cifs_permission,
866#ifdef CONFIG_CIFS_XATTR
867 .setxattr = cifs_setxattr,
868 .getxattr = cifs_getxattr,
869 .listxattr = cifs_listxattr,
870 .removexattr = cifs_removexattr,
871#endif
872};
873
874const struct inode_operations cifs_symlink_inode_ops = {
875 .readlink = generic_readlink,
876 .follow_link = cifs_follow_link,
877 .put_link = kfree_put_link,
878 .permission = cifs_permission,
879 /* BB add the following two eventually */
880 /* revalidate: cifs_revalidate,
881 setattr: cifs_notify_change, *//* BB do we need notify change */
882#ifdef CONFIG_CIFS_XATTR
883 .setxattr = cifs_setxattr,
884 .getxattr = cifs_getxattr,
885 .listxattr = cifs_listxattr,
886 .removexattr = cifs_removexattr,
887#endif
888};
889
890const struct file_operations cifs_file_ops = {
891 .read = do_sync_read,
892 .write = do_sync_write,
893 .aio_read = generic_file_aio_read,
894 .aio_write = cifs_file_aio_write,
895 .open = cifs_open,
896 .release = cifs_close,
897 .lock = cifs_lock,
898 .fsync = cifs_fsync,
899 .flush = cifs_flush,
900 .mmap = cifs_file_mmap,
901 .splice_read = generic_file_splice_read,
902 .llseek = cifs_llseek,
903#ifdef CONFIG_CIFS_POSIX
904 .unlocked_ioctl = cifs_ioctl,
905#endif /* CONFIG_CIFS_POSIX */
906 .setlease = cifs_setlease,
907};
908
909const struct file_operations cifs_file_strict_ops = {
910 .read = do_sync_read,
911 .write = do_sync_write,
912 .aio_read = cifs_strict_readv,
913 .aio_write = cifs_strict_writev,
914 .open = cifs_open,
915 .release = cifs_close,
916 .lock = cifs_lock,
917 .fsync = cifs_strict_fsync,
918 .flush = cifs_flush,
919 .mmap = cifs_file_strict_mmap,
920 .splice_read = generic_file_splice_read,
921 .llseek = cifs_llseek,
922#ifdef CONFIG_CIFS_POSIX
923 .unlocked_ioctl = cifs_ioctl,
924#endif /* CONFIG_CIFS_POSIX */
925 .setlease = cifs_setlease,
926};
927
928const struct file_operations cifs_file_direct_ops = {
929 /* BB reevaluate whether they can be done with directio, no cache */
930 .read = do_sync_read,
931 .write = do_sync_write,
932 .aio_read = cifs_user_readv,
933 .aio_write = cifs_user_writev,
934 .open = cifs_open,
935 .release = cifs_close,
936 .lock = cifs_lock,
937 .fsync = cifs_fsync,
938 .flush = cifs_flush,
939 .mmap = cifs_file_mmap,
940 .splice_read = generic_file_splice_read,
941#ifdef CONFIG_CIFS_POSIX
942 .unlocked_ioctl = cifs_ioctl,
943#endif /* CONFIG_CIFS_POSIX */
944 .llseek = cifs_llseek,
945 .setlease = cifs_setlease,
946};
947
948const struct file_operations cifs_file_nobrl_ops = {
949 .read = do_sync_read,
950 .write = do_sync_write,
951 .aio_read = generic_file_aio_read,
952 .aio_write = cifs_file_aio_write,
953 .open = cifs_open,
954 .release = cifs_close,
955 .fsync = cifs_fsync,
956 .flush = cifs_flush,
957 .mmap = cifs_file_mmap,
958 .splice_read = generic_file_splice_read,
959 .llseek = cifs_llseek,
960#ifdef CONFIG_CIFS_POSIX
961 .unlocked_ioctl = cifs_ioctl,
962#endif /* CONFIG_CIFS_POSIX */
963 .setlease = cifs_setlease,
964};
965
966const struct file_operations cifs_file_strict_nobrl_ops = {
967 .read = do_sync_read,
968 .write = do_sync_write,
969 .aio_read = cifs_strict_readv,
970 .aio_write = cifs_strict_writev,
971 .open = cifs_open,
972 .release = cifs_close,
973 .fsync = cifs_strict_fsync,
974 .flush = cifs_flush,
975 .mmap = cifs_file_strict_mmap,
976 .splice_read = generic_file_splice_read,
977 .llseek = cifs_llseek,
978#ifdef CONFIG_CIFS_POSIX
979 .unlocked_ioctl = cifs_ioctl,
980#endif /* CONFIG_CIFS_POSIX */
981 .setlease = cifs_setlease,
982};
983
984const struct file_operations cifs_file_direct_nobrl_ops = {
985 /* BB reevaluate whether they can be done with directio, no cache */
986 .read = do_sync_read,
987 .write = do_sync_write,
988 .aio_read = cifs_user_readv,
989 .aio_write = cifs_user_writev,
990 .open = cifs_open,
991 .release = cifs_close,
992 .fsync = cifs_fsync,
993 .flush = cifs_flush,
994 .mmap = cifs_file_mmap,
995 .splice_read = generic_file_splice_read,
996#ifdef CONFIG_CIFS_POSIX
997 .unlocked_ioctl = cifs_ioctl,
998#endif /* CONFIG_CIFS_POSIX */
999 .llseek = cifs_llseek,
1000 .setlease = cifs_setlease,
1001};
1002
1003const struct file_operations cifs_dir_ops = {
1004 .iterate = cifs_readdir,
1005 .release = cifs_closedir,
1006 .read = generic_read_dir,
1007 .unlocked_ioctl = cifs_ioctl,
1008 .llseek = generic_file_llseek,
1009};
1010
1011static void
1012cifs_init_once(void *inode)
1013{
1014 struct cifsInodeInfo *cifsi = inode;
1015
1016 inode_init_once(&cifsi->vfs_inode);
1017 init_rwsem(&cifsi->lock_sem);
1018}
1019
1020static int __init
1021cifs_init_inodecache(void)
1022{
1023 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1024 sizeof(struct cifsInodeInfo),
1025 0, (SLAB_RECLAIM_ACCOUNT|
1026 SLAB_MEM_SPREAD),
1027 cifs_init_once);
1028 if (cifs_inode_cachep == NULL)
1029 return -ENOMEM;
1030
1031 return 0;
1032}
1033
1034static void
1035cifs_destroy_inodecache(void)
1036{
1037 /*
1038 * Make sure all delayed rcu free inodes are flushed before we
1039 * destroy cache.
1040 */
1041 rcu_barrier();
1042 kmem_cache_destroy(cifs_inode_cachep);
1043}
1044
1045static int
1046cifs_init_request_bufs(void)
1047{
1048 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1049#ifdef CONFIG_CIFS_SMB2
1050 /*
1051 * SMB2 maximum header size is bigger than CIFS one - no problems to
1052 * allocate some more bytes for CIFS.
1053 */
1054 max_hdr_size = MAX_SMB2_HDR_SIZE;
1055#endif
1056 if (CIFSMaxBufSize < 8192) {
1057 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1058 Unicode path name has to fit in any SMB/CIFS path based frames */
1059 CIFSMaxBufSize = 8192;
1060 } else if (CIFSMaxBufSize > 1024*127) {
1061 CIFSMaxBufSize = 1024 * 127;
1062 } else {
1063 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1064 }
1065/*
1066 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1067 CIFSMaxBufSize, CIFSMaxBufSize);
1068*/
1069 cifs_req_cachep = kmem_cache_create("cifs_request",
1070 CIFSMaxBufSize + max_hdr_size, 0,
1071 SLAB_HWCACHE_ALIGN, NULL);
1072 if (cifs_req_cachep == NULL)
1073 return -ENOMEM;
1074
1075 if (cifs_min_rcv < 1)
1076 cifs_min_rcv = 1;
1077 else if (cifs_min_rcv > 64) {
1078 cifs_min_rcv = 64;
1079 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1080 }
1081
1082 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1083 cifs_req_cachep);
1084
1085 if (cifs_req_poolp == NULL) {
1086 kmem_cache_destroy(cifs_req_cachep);
1087 return -ENOMEM;
1088 }
1089 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1090 almost all handle based requests (but not write response, nor is it
1091 sufficient for path based requests). A smaller size would have
1092 been more efficient (compacting multiple slab items on one 4k page)
1093 for the case in which debug was on, but this larger size allows
1094 more SMBs to use small buffer alloc and is still much more
1095 efficient to alloc 1 per page off the slab compared to 17K (5page)
1096 alloc of large cifs buffers even when page debugging is on */
1097 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1098 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1099 NULL);
1100 if (cifs_sm_req_cachep == NULL) {
1101 mempool_destroy(cifs_req_poolp);
1102 kmem_cache_destroy(cifs_req_cachep);
1103 return -ENOMEM;
1104 }
1105
1106 if (cifs_min_small < 2)
1107 cifs_min_small = 2;
1108 else if (cifs_min_small > 256) {
1109 cifs_min_small = 256;
1110 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1111 }
1112
1113 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1114 cifs_sm_req_cachep);
1115
1116 if (cifs_sm_req_poolp == NULL) {
1117 mempool_destroy(cifs_req_poolp);
1118 kmem_cache_destroy(cifs_req_cachep);
1119 kmem_cache_destroy(cifs_sm_req_cachep);
1120 return -ENOMEM;
1121 }
1122
1123 return 0;
1124}
1125
1126static void
1127cifs_destroy_request_bufs(void)
1128{
1129 mempool_destroy(cifs_req_poolp);
1130 kmem_cache_destroy(cifs_req_cachep);
1131 mempool_destroy(cifs_sm_req_poolp);
1132 kmem_cache_destroy(cifs_sm_req_cachep);
1133}
1134
1135static int
1136cifs_init_mids(void)
1137{
1138 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1139 sizeof(struct mid_q_entry), 0,
1140 SLAB_HWCACHE_ALIGN, NULL);
1141 if (cifs_mid_cachep == NULL)
1142 return -ENOMEM;
1143
1144 /* 3 is a reasonable minimum number of simultaneous operations */
1145 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1146 if (cifs_mid_poolp == NULL) {
1147 kmem_cache_destroy(cifs_mid_cachep);
1148 return -ENOMEM;
1149 }
1150
1151 return 0;
1152}
1153
1154static void
1155cifs_destroy_mids(void)
1156{
1157 mempool_destroy(cifs_mid_poolp);
1158 kmem_cache_destroy(cifs_mid_cachep);
1159}
1160
1161static int __init
1162init_cifs(void)
1163{
1164 int rc = 0;
1165 cifs_proc_init();
1166 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1167#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1168 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1169 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1170#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1171/*
1172 * Initialize Global counters
1173 */
1174 atomic_set(&sesInfoAllocCount, 0);
1175 atomic_set(&tconInfoAllocCount, 0);
1176 atomic_set(&tcpSesAllocCount, 0);
1177 atomic_set(&tcpSesReconnectCount, 0);
1178 atomic_set(&tconInfoReconnectCount, 0);
1179
1180 atomic_set(&bufAllocCount, 0);
1181 atomic_set(&smBufAllocCount, 0);
1182#ifdef CONFIG_CIFS_STATS2
1183 atomic_set(&totBufAllocCount, 0);
1184 atomic_set(&totSmBufAllocCount, 0);
1185#endif /* CONFIG_CIFS_STATS2 */
1186
1187 atomic_set(&midCount, 0);
1188 GlobalCurrentXid = 0;
1189 GlobalTotalActiveXid = 0;
1190 GlobalMaxActiveXid = 0;
1191 spin_lock_init(&cifs_tcp_ses_lock);
1192 spin_lock_init(&cifs_file_list_lock);
1193 spin_lock_init(&GlobalMid_Lock);
1194
1195#ifdef CONFIG_CIFS_SMB2
1196 get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1197#endif
1198
1199 if (cifs_max_pending < 2) {
1200 cifs_max_pending = 2;
1201 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1202 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1203 cifs_max_pending = CIFS_MAX_REQ;
1204 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1205 CIFS_MAX_REQ);
1206 }
1207
1208 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1209 if (!cifsiod_wq) {
1210 rc = -ENOMEM;
1211 goto out_clean_proc;
1212 }
1213
1214 rc = cifs_fscache_register();
1215 if (rc)
1216 goto out_destroy_wq;
1217
1218 rc = cifs_init_inodecache();
1219 if (rc)
1220 goto out_unreg_fscache;
1221
1222 rc = cifs_init_mids();
1223 if (rc)
1224 goto out_destroy_inodecache;
1225
1226 rc = cifs_init_request_bufs();
1227 if (rc)
1228 goto out_destroy_mids;
1229
1230#ifdef CONFIG_CIFS_UPCALL
1231 rc = register_key_type(&cifs_spnego_key_type);
1232 if (rc)
1233 goto out_destroy_request_bufs;
1234#endif /* CONFIG_CIFS_UPCALL */
1235
1236#ifdef CONFIG_CIFS_ACL
1237 rc = init_cifs_idmap();
1238 if (rc)
1239 goto out_register_key_type;
1240#endif /* CONFIG_CIFS_ACL */
1241
1242 rc = register_filesystem(&cifs_fs_type);
1243 if (rc)
1244 goto out_init_cifs_idmap;
1245
1246 return 0;
1247
1248out_init_cifs_idmap:
1249#ifdef CONFIG_CIFS_ACL
1250 exit_cifs_idmap();
1251out_register_key_type:
1252#endif
1253#ifdef CONFIG_CIFS_UPCALL
1254 unregister_key_type(&cifs_spnego_key_type);
1255out_destroy_request_bufs:
1256#endif
1257 cifs_destroy_request_bufs();
1258out_destroy_mids:
1259 cifs_destroy_mids();
1260out_destroy_inodecache:
1261 cifs_destroy_inodecache();
1262out_unreg_fscache:
1263 cifs_fscache_unregister();
1264out_destroy_wq:
1265 destroy_workqueue(cifsiod_wq);
1266out_clean_proc:
1267 cifs_proc_clean();
1268 return rc;
1269}
1270
1271static void __exit
1272exit_cifs(void)
1273{
1274 cifs_dbg(NOISY, "exit_cifs\n");
1275 unregister_filesystem(&cifs_fs_type);
1276 cifs_dfs_release_automount_timer();
1277#ifdef CONFIG_CIFS_ACL
1278 exit_cifs_idmap();
1279#endif
1280#ifdef CONFIG_CIFS_UPCALL
1281 unregister_key_type(&cifs_spnego_key_type);
1282#endif
1283 cifs_destroy_request_bufs();
1284 cifs_destroy_mids();
1285 cifs_destroy_inodecache();
1286 cifs_fscache_unregister();
1287 destroy_workqueue(cifsiod_wq);
1288 cifs_proc_clean();
1289}
1290
1291MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1292MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1293MODULE_DESCRIPTION
1294 ("VFS to access servers complying with the SNIA CIFS Specification "
1295 "e.g. Samba and Windows");
1296MODULE_VERSION(CIFS_VERSION);
1297module_init(init_cifs)
1298module_exit(exit_cifs)