4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Common Internet FileSystem (CIFS) client
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.
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.
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
24 /* Note that BB means BUGBUG (ie something to fix eventually) */
26 #include <linux/module.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>
42 #define DECLARE_GLOBALS_HERE
44 #include "cifsproto.h"
45 #include "cifs_debug.h"
46 #include "cifs_fs_sb.h"
48 #include <linux/key-type.h>
49 #include "cifs_spnego.h"
51 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
56 bool enable_oplocks
= true;
57 unsigned int linuxExtEnabled
= 1;
58 unsigned int lookupCacheEnabled
= 1;
59 unsigned int multiuser_mount
= 0;
60 unsigned int global_secflags
= CIFSSEC_DEF
;
61 /* unsigned int ntlmv2_support = 0; */
62 unsigned int sign_CIFS_PDUs
= 1;
63 static const struct super_operations cifs_super_ops
;
64 unsigned int CIFSMaxBufSize
= CIFS_MAX_MSGSIZE
;
65 module_param(CIFSMaxBufSize
, int, 0);
66 MODULE_PARM_DESC(CIFSMaxBufSize
, "Network buffer size (not including header). "
67 "Default: 16384 Range: 8192 to 130048");
68 unsigned int cifs_min_rcv
= CIFS_MIN_RCV_POOL
;
69 module_param(cifs_min_rcv
, int, 0);
70 MODULE_PARM_DESC(cifs_min_rcv
, "Network buffers in pool. Default: 4 Range: "
72 unsigned int cifs_min_small
= 30;
73 module_param(cifs_min_small
, int, 0);
74 MODULE_PARM_DESC(cifs_min_small
, "Small network buffers in pool. Default: 30 "
76 unsigned int cifs_max_pending
= CIFS_MAX_REQ
;
77 module_param(cifs_max_pending
, int, 0444);
78 MODULE_PARM_DESC(cifs_max_pending
, "Simultaneous requests to server. "
79 "Default: 32767 Range: 2 to 32767.");
80 module_param(enable_oplocks
, bool, 0644);
81 MODULE_PARM_DESC(enable_oplocks
, "Enable or disable oplocks (bool). Default:"
84 extern mempool_t
*cifs_sm_req_poolp
;
85 extern mempool_t
*cifs_req_poolp
;
86 extern mempool_t
*cifs_mid_poolp
;
88 struct workqueue_struct
*cifsiod_wq
;
91 cifs_read_super(struct super_block
*sb
)
94 struct cifs_sb_info
*cifs_sb
;
97 cifs_sb
= CIFS_SB(sb
);
99 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_POSIXACL
)
100 sb
->s_flags
|= MS_POSIXACL
;
102 if (cifs_sb_master_tcon(cifs_sb
)->ses
->capabilities
& CAP_LARGE_FILES
)
103 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
105 sb
->s_maxbytes
= MAX_NON_LFS
;
107 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
108 sb
->s_time_gran
= 100;
110 sb
->s_magic
= CIFS_MAGIC_NUMBER
;
111 sb
->s_op
= &cifs_super_ops
;
112 sb
->s_bdi
= &cifs_sb
->bdi
;
113 sb
->s_blocksize
= CIFS_MAX_MSGSIZE
;
114 sb
->s_blocksize_bits
= 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
115 inode
= cifs_root_iget(sb
);
122 sb
->s_root
= d_make_root(inode
);
128 /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
129 if (cifs_sb_master_tcon(cifs_sb
)->nocase
)
130 sb
->s_d_op
= &cifs_ci_dentry_ops
;
132 sb
->s_d_op
= &cifs_dentry_ops
;
134 #ifdef CONFIG_CIFS_NFSD_EXPORT
135 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) {
136 cFYI(1, "export ops supported");
137 sb
->s_export_op
= &cifs_export_ops
;
139 #endif /* CONFIG_CIFS_NFSD_EXPORT */
144 cERROR(1, "cifs_read_super: get root inode failed");
148 static void cifs_kill_sb(struct super_block
*sb
)
150 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
152 cifs_umount(cifs_sb
);
156 cifs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
158 struct super_block
*sb
= dentry
->d_sb
;
159 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
160 struct cifs_tcon
*tcon
= cifs_sb_master_tcon(cifs_sb
);
161 int rc
= -EOPNOTSUPP
;
166 buf
->f_type
= CIFS_MAGIC_NUMBER
;
169 * PATH_MAX may be too long - it would presumably be total path,
170 * but note that some servers (includinng Samba 3) have a shorter
173 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
175 buf
->f_namelen
= PATH_MAX
;
176 buf
->f_files
= 0; /* undefined */
177 buf
->f_ffree
= 0; /* unlimited */
180 * We could add a second check for a QFS Unix capability bit
182 if ((tcon
->ses
->capabilities
& CAP_UNIX
) &&
183 (CIFS_POSIX_EXTENSIONS
& le64_to_cpu(tcon
->fsUnixInfo
.Capability
)))
184 rc
= CIFSSMBQFSPosixInfo(xid
, tcon
, buf
);
187 * Only need to call the old QFSInfo if failed on newer one,
190 if (rc
&& (tcon
->ses
->capabilities
& CAP_NT_SMBS
))
191 rc
= CIFSSMBQFSInfo(xid
, tcon
, buf
);
194 * Some old Windows servers also do not support level 103, retry with
195 * older level one if old server failed the previous call or we
196 * bypassed it because we detected that this was an older LANMAN sess
199 rc
= SMBOldQFSInfo(xid
, tcon
, buf
);
205 static int cifs_permission(struct inode
*inode
, int mask
)
207 struct cifs_sb_info
*cifs_sb
;
209 cifs_sb
= CIFS_SB(inode
->i_sb
);
211 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_PERM
) {
212 if ((mask
& MAY_EXEC
) && !execute_ok(inode
))
216 } else /* file mode might have been restricted at mount time
217 on the client (above and beyond ACL on servers) for
218 servers which do not support setting and viewing mode bits,
219 so allowing client to check permissions is useful */
220 return generic_permission(inode
, mask
);
223 static struct kmem_cache
*cifs_inode_cachep
;
224 static struct kmem_cache
*cifs_req_cachep
;
225 static struct kmem_cache
*cifs_mid_cachep
;
226 static struct kmem_cache
*cifs_sm_req_cachep
;
227 mempool_t
*cifs_sm_req_poolp
;
228 mempool_t
*cifs_req_poolp
;
229 mempool_t
*cifs_mid_poolp
;
231 static struct inode
*
232 cifs_alloc_inode(struct super_block
*sb
)
234 struct cifsInodeInfo
*cifs_inode
;
235 cifs_inode
= kmem_cache_alloc(cifs_inode_cachep
, GFP_KERNEL
);
238 cifs_inode
->cifsAttrs
= 0x20; /* default */
239 cifs_inode
->time
= 0;
240 /* Until the file is open and we have gotten oplock
241 info back from the server, can not assume caching of
242 file data or metadata */
243 cifs_set_oplock_level(cifs_inode
, 0);
244 cifs_inode
->delete_pending
= false;
245 cifs_inode
->invalid_mapping
= false;
246 cifs_inode
->vfs_inode
.i_blkbits
= 14; /* 2**14 = CIFS_MAX_MSGSIZE */
247 cifs_inode
->server_eof
= 0;
248 cifs_inode
->uniqueid
= 0;
249 cifs_inode
->createtime
= 0;
251 /* Can not set i_flags here - they get immediately overwritten
252 to zero by the VFS */
253 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
254 INIT_LIST_HEAD(&cifs_inode
->openFileList
);
255 return &cifs_inode
->vfs_inode
;
258 static void cifs_i_callback(struct rcu_head
*head
)
260 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
261 INIT_LIST_HEAD(&inode
->i_dentry
);
262 kmem_cache_free(cifs_inode_cachep
, CIFS_I(inode
));
266 cifs_destroy_inode(struct inode
*inode
)
268 call_rcu(&inode
->i_rcu
, cifs_i_callback
);
272 cifs_evict_inode(struct inode
*inode
)
274 truncate_inode_pages(&inode
->i_data
, 0);
275 end_writeback(inode
);
276 cifs_fscache_release_inode_cookie(inode
);
280 cifs_show_address(struct seq_file
*s
, struct TCP_Server_Info
*server
)
282 struct sockaddr_in
*sa
= (struct sockaddr_in
*) &server
->dstaddr
;
283 struct sockaddr_in6
*sa6
= (struct sockaddr_in6
*) &server
->dstaddr
;
285 seq_printf(s
, ",addr=");
287 switch (server
->dstaddr
.ss_family
) {
289 seq_printf(s
, "%pI4", &sa
->sin_addr
.s_addr
);
292 seq_printf(s
, "%pI6", &sa6
->sin6_addr
.s6_addr
);
293 if (sa6
->sin6_scope_id
)
294 seq_printf(s
, "%%%u", sa6
->sin6_scope_id
);
297 seq_printf(s
, "(unknown)");
302 cifs_show_security(struct seq_file
*s
, struct TCP_Server_Info
*server
)
304 seq_printf(s
, ",sec=");
306 switch (server
->secType
) {
308 seq_printf(s
, "lanman");
311 seq_printf(s
, "ntlmv2");
314 seq_printf(s
, "ntlm");
317 seq_printf(s
, "krb5");
320 seq_printf(s
, "ntlmssp");
323 /* shouldn't ever happen */
324 seq_printf(s
, "unknown");
328 if (server
->sec_mode
& (SECMODE_SIGN_REQUIRED
| SECMODE_SIGN_ENABLED
))
333 * cifs_show_options() is for displaying mount options in /proc/mounts.
334 * Not all settable options are displayed but most of the important
338 cifs_show_options(struct seq_file
*s
, struct dentry
*root
)
340 struct cifs_sb_info
*cifs_sb
= CIFS_SB(root
->d_sb
);
341 struct cifs_tcon
*tcon
= cifs_sb_master_tcon(cifs_sb
);
342 struct sockaddr
*srcaddr
;
343 srcaddr
= (struct sockaddr
*)&tcon
->ses
->server
->srcaddr
;
345 cifs_show_security(s
, tcon
->ses
->server
);
347 seq_printf(s
, ",unc=%s", tcon
->treeName
);
349 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MULTIUSER
)
350 seq_printf(s
, ",multiuser");
351 else if (tcon
->ses
->user_name
)
352 seq_printf(s
, ",username=%s", tcon
->ses
->user_name
);
354 if (tcon
->ses
->domainName
)
355 seq_printf(s
, ",domain=%s", tcon
->ses
->domainName
);
357 if (srcaddr
->sa_family
!= AF_UNSPEC
) {
358 struct sockaddr_in
*saddr4
;
359 struct sockaddr_in6
*saddr6
;
360 saddr4
= (struct sockaddr_in
*)srcaddr
;
361 saddr6
= (struct sockaddr_in6
*)srcaddr
;
362 if (srcaddr
->sa_family
== AF_INET6
)
363 seq_printf(s
, ",srcaddr=%pI6c",
365 else if (srcaddr
->sa_family
== AF_INET
)
366 seq_printf(s
, ",srcaddr=%pI4",
367 &saddr4
->sin_addr
.s_addr
);
369 seq_printf(s
, ",srcaddr=BAD-AF:%i",
370 (int)(srcaddr
->sa_family
));
373 seq_printf(s
, ",uid=%d", cifs_sb
->mnt_uid
);
374 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_OVERR_UID
)
375 seq_printf(s
, ",forceuid");
377 seq_printf(s
, ",noforceuid");
379 seq_printf(s
, ",gid=%d", cifs_sb
->mnt_gid
);
380 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_OVERR_GID
)
381 seq_printf(s
, ",forcegid");
383 seq_printf(s
, ",noforcegid");
385 cifs_show_address(s
, tcon
->ses
->server
);
388 seq_printf(s
, ",file_mode=0%ho,dir_mode=0%ho",
389 cifs_sb
->mnt_file_mode
,
390 cifs_sb
->mnt_dir_mode
);
392 seq_printf(s
, ",seal");
394 seq_printf(s
, ",nocase");
396 seq_printf(s
, ",hard");
398 seq_printf(s
, ",unix");
400 seq_printf(s
, ",nounix");
401 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_POSIX_PATHS
)
402 seq_printf(s
, ",posixpaths");
403 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SET_UID
)
404 seq_printf(s
, ",setuids");
405 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
)
406 seq_printf(s
, ",serverino");
407 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_RWPIDFORWARD
)
408 seq_printf(s
, ",rwpidforward");
409 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NOPOSIXBRL
)
410 seq_printf(s
, ",forcemand");
411 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_DIRECT_IO
)
412 seq_printf(s
, ",directio");
413 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_XATTR
)
414 seq_printf(s
, ",nouser_xattr");
415 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR
)
416 seq_printf(s
, ",mapchars");
417 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_UNX_EMUL
)
418 seq_printf(s
, ",sfu");
419 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_BRL
)
420 seq_printf(s
, ",nobrl");
421 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_ACL
)
422 seq_printf(s
, ",cifsacl");
423 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_DYNPERM
)
424 seq_printf(s
, ",dynperm");
425 if (root
->d_sb
->s_flags
& MS_POSIXACL
)
426 seq_printf(s
, ",acl");
427 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MF_SYMLINKS
)
428 seq_printf(s
, ",mfsymlinks");
429 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_FSCACHE
)
430 seq_printf(s
, ",fsc");
431 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NOSSYNC
)
432 seq_printf(s
, ",nostrictsync");
433 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_PERM
)
434 seq_printf(s
, ",noperm");
435 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_STRICT_IO
)
436 seq_printf(s
, ",strictcache");
438 seq_printf(s
, ",rsize=%d", cifs_sb
->rsize
);
439 seq_printf(s
, ",wsize=%d", cifs_sb
->wsize
);
440 /* convert actimeo and display it in seconds */
441 seq_printf(s
, ",actimeo=%lu", cifs_sb
->actimeo
/ HZ
);
446 static void cifs_umount_begin(struct super_block
*sb
)
448 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
449 struct cifs_tcon
*tcon
;
454 tcon
= cifs_sb_master_tcon(cifs_sb
);
456 spin_lock(&cifs_tcp_ses_lock
);
457 if ((tcon
->tc_count
> 1) || (tcon
->tidStatus
== CifsExiting
)) {
458 /* we have other mounts to same share or we have
459 already tried to force umount this and woken up
460 all waiting network requests, nothing to do */
461 spin_unlock(&cifs_tcp_ses_lock
);
463 } else if (tcon
->tc_count
== 1)
464 tcon
->tidStatus
= CifsExiting
;
465 spin_unlock(&cifs_tcp_ses_lock
);
467 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
468 /* cancel_notify_requests(tcon); */
469 if (tcon
->ses
&& tcon
->ses
->server
) {
470 cFYI(1, "wake up tasks now - umount begin not complete");
471 wake_up_all(&tcon
->ses
->server
->request_q
);
472 wake_up_all(&tcon
->ses
->server
->response_q
);
473 msleep(1); /* yield */
474 /* we have to kick the requests once more */
475 wake_up_all(&tcon
->ses
->server
->response_q
);
482 #ifdef CONFIG_CIFS_STATS2
483 static int cifs_show_stats(struct seq_file
*s
, struct dentry
*root
)
490 static int cifs_remount(struct super_block
*sb
, int *flags
, char *data
)
492 *flags
|= MS_NODIRATIME
;
496 static int cifs_drop_inode(struct inode
*inode
)
498 struct cifs_sb_info
*cifs_sb
= CIFS_SB(inode
->i_sb
);
500 /* no serverino => unconditional eviction */
501 return !(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) ||
502 generic_drop_inode(inode
);
505 static const struct super_operations cifs_super_ops
= {
506 .statfs
= cifs_statfs
,
507 .alloc_inode
= cifs_alloc_inode
,
508 .destroy_inode
= cifs_destroy_inode
,
509 .drop_inode
= cifs_drop_inode
,
510 .evict_inode
= cifs_evict_inode
,
511 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
512 function unless later we add lazy close of inodes or unless the
513 kernel forgets to call us with the same number of releases (closes)
515 .show_options
= cifs_show_options
,
516 .umount_begin
= cifs_umount_begin
,
517 .remount_fs
= cifs_remount
,
518 #ifdef CONFIG_CIFS_STATS2
519 .show_stats
= cifs_show_stats
,
524 * Get root dentry from superblock according to prefix path mount option.
525 * Return dentry with refcount + 1 on success and NULL otherwise.
527 static struct dentry
*
528 cifs_get_root(struct smb_vol
*vol
, struct super_block
*sb
)
530 struct dentry
*dentry
;
531 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
532 char *full_path
= NULL
;
536 full_path
= cifs_build_path_to_root(vol
, cifs_sb
,
537 cifs_sb_master_tcon(cifs_sb
));
538 if (full_path
== NULL
)
539 return ERR_PTR(-ENOMEM
);
541 cFYI(1, "Get root dentry for %s", full_path
);
543 sep
= CIFS_DIR_SEP(cifs_sb
);
544 dentry
= dget(sb
->s_root
);
548 struct inode
*dir
= dentry
->d_inode
;
549 struct dentry
*child
;
553 dentry
= ERR_PTR(-ENOENT
);
557 /* skip separators */
564 while (*s
&& *s
!= sep
)
567 mutex_lock(&dir
->i_mutex
);
568 child
= lookup_one_len(p
, dentry
, s
- p
);
569 mutex_unlock(&dir
->i_mutex
);
572 } while (!IS_ERR(dentry
));
577 static int cifs_set_super(struct super_block
*sb
, void *data
)
579 struct cifs_mnt_data
*mnt_data
= data
;
580 sb
->s_fs_info
= mnt_data
->cifs_sb
;
581 return set_anon_super(sb
, NULL
);
584 static struct dentry
*
585 cifs_do_mount(struct file_system_type
*fs_type
,
586 int flags
, const char *dev_name
, void *data
)
589 struct super_block
*sb
;
590 struct cifs_sb_info
*cifs_sb
;
591 struct smb_vol
*volume_info
;
592 struct cifs_mnt_data mnt_data
;
595 cFYI(1, "Devname: %s flags: %d ", dev_name
, flags
);
597 volume_info
= cifs_get_volume_info((char *)data
, dev_name
);
598 if (IS_ERR(volume_info
))
599 return ERR_CAST(volume_info
);
601 cifs_sb
= kzalloc(sizeof(struct cifs_sb_info
), GFP_KERNEL
);
602 if (cifs_sb
== NULL
) {
603 root
= ERR_PTR(-ENOMEM
);
607 cifs_sb
->mountdata
= kstrndup(data
, PAGE_SIZE
, GFP_KERNEL
);
608 if (cifs_sb
->mountdata
== NULL
) {
609 root
= ERR_PTR(-ENOMEM
);
613 cifs_setup_cifs_sb(volume_info
, cifs_sb
);
615 rc
= cifs_mount(cifs_sb
, volume_info
);
617 if (!(flags
& MS_SILENT
))
618 cERROR(1, "cifs_mount failed w/return code = %d", rc
);
623 mnt_data
.vol
= volume_info
;
624 mnt_data
.cifs_sb
= cifs_sb
;
625 mnt_data
.flags
= flags
;
627 sb
= sget(fs_type
, cifs_match_super
, cifs_set_super
, &mnt_data
);
630 cifs_umount(cifs_sb
);
635 cFYI(1, "Use existing superblock");
636 cifs_umount(cifs_sb
);
639 /* BB should we make this contingent on mount parm? */
640 sb
->s_flags
|= MS_NODIRATIME
| MS_NOATIME
;
642 rc
= cifs_read_super(sb
);
648 sb
->s_flags
|= MS_ACTIVE
;
651 root
= cifs_get_root(volume_info
, sb
);
655 cFYI(1, "dentry root is: %p", root
);
659 deactivate_locked_super(sb
);
661 cifs_cleanup_volume_info(volume_info
);
665 kfree(cifs_sb
->mountdata
);
669 unload_nls(volume_info
->local_nls
);
673 static ssize_t
cifs_file_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
674 unsigned long nr_segs
, loff_t pos
)
676 struct inode
*inode
= iocb
->ki_filp
->f_path
.dentry
->d_inode
;
680 written
= generic_file_aio_write(iocb
, iov
, nr_segs
, pos
);
682 if (CIFS_I(inode
)->clientCanCacheAll
)
685 rc
= filemap_fdatawrite(inode
->i_mapping
);
687 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc
, inode
);
692 static loff_t
cifs_llseek(struct file
*file
, loff_t offset
, int origin
)
695 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
696 * the cached file length
698 if (origin
!= SEEK_SET
|| origin
!= SEEK_CUR
) {
700 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
703 * We need to be sure that all dirty pages are written and the
704 * server has the newest file length.
706 if (!CIFS_I(inode
)->clientCanCacheRead
&& inode
->i_mapping
&&
707 inode
->i_mapping
->nrpages
!= 0) {
708 rc
= filemap_fdatawait(inode
->i_mapping
);
710 mapping_set_error(inode
->i_mapping
, rc
);
715 * Some applications poll for the file length in this strange
716 * way so we must seek to end on non-oplocked files by
717 * setting the revalidate time to zero.
719 CIFS_I(inode
)->time
= 0;
721 rc
= cifs_revalidate_file_attr(file
);
725 return generic_file_llseek(file
, offset
, origin
);
728 static int cifs_setlease(struct file
*file
, long arg
, struct file_lock
**lease
)
730 /* note that this is called by vfs setlease with lock_flocks held
731 to protect *lease from going away */
732 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
733 struct cifsFileInfo
*cfile
= file
->private_data
;
735 if (!(S_ISREG(inode
->i_mode
)))
738 /* check if file is oplocked */
739 if (((arg
== F_RDLCK
) &&
740 (CIFS_I(inode
)->clientCanCacheRead
)) ||
742 (CIFS_I(inode
)->clientCanCacheAll
)))
743 return generic_setlease(file
, arg
, lease
);
744 else if (tlink_tcon(cfile
->tlink
)->local_lease
&&
745 !CIFS_I(inode
)->clientCanCacheRead
)
746 /* If the server claims to support oplock on this
747 file, then we still need to check oplock even
748 if the local_lease mount option is set, but there
749 are servers which do not support oplock for which
750 this mount option may be useful if the user
751 knows that the file won't be changed on the server
753 return generic_setlease(file
, arg
, lease
);
758 struct file_system_type cifs_fs_type
= {
759 .owner
= THIS_MODULE
,
761 .mount
= cifs_do_mount
,
762 .kill_sb
= cifs_kill_sb
,
765 const struct inode_operations cifs_dir_inode_ops
= {
766 .create
= cifs_create
,
767 .lookup
= cifs_lookup
,
768 .getattr
= cifs_getattr
,
769 .unlink
= cifs_unlink
,
770 .link
= cifs_hardlink
,
773 .rename
= cifs_rename
,
774 .permission
= cifs_permission
,
775 /* revalidate:cifs_revalidate, */
776 .setattr
= cifs_setattr
,
777 .symlink
= cifs_symlink
,
779 #ifdef CONFIG_CIFS_XATTR
780 .setxattr
= cifs_setxattr
,
781 .getxattr
= cifs_getxattr
,
782 .listxattr
= cifs_listxattr
,
783 .removexattr
= cifs_removexattr
,
787 const struct inode_operations cifs_file_inode_ops
= {
788 /* revalidate:cifs_revalidate, */
789 .setattr
= cifs_setattr
,
790 .getattr
= cifs_getattr
, /* do we need this anymore? */
791 .rename
= cifs_rename
,
792 .permission
= cifs_permission
,
793 #ifdef CONFIG_CIFS_XATTR
794 .setxattr
= cifs_setxattr
,
795 .getxattr
= cifs_getxattr
,
796 .listxattr
= cifs_listxattr
,
797 .removexattr
= cifs_removexattr
,
801 const struct inode_operations cifs_symlink_inode_ops
= {
802 .readlink
= generic_readlink
,
803 .follow_link
= cifs_follow_link
,
804 .put_link
= cifs_put_link
,
805 .permission
= cifs_permission
,
806 /* BB add the following two eventually */
807 /* revalidate: cifs_revalidate,
808 setattr: cifs_notify_change, *//* BB do we need notify change */
809 #ifdef CONFIG_CIFS_XATTR
810 .setxattr
= cifs_setxattr
,
811 .getxattr
= cifs_getxattr
,
812 .listxattr
= cifs_listxattr
,
813 .removexattr
= cifs_removexattr
,
817 const struct file_operations cifs_file_ops
= {
818 .read
= do_sync_read
,
819 .write
= do_sync_write
,
820 .aio_read
= generic_file_aio_read
,
821 .aio_write
= cifs_file_aio_write
,
823 .release
= cifs_close
,
827 .mmap
= cifs_file_mmap
,
828 .splice_read
= generic_file_splice_read
,
829 .llseek
= cifs_llseek
,
830 #ifdef CONFIG_CIFS_POSIX
831 .unlocked_ioctl
= cifs_ioctl
,
832 #endif /* CONFIG_CIFS_POSIX */
833 .setlease
= cifs_setlease
,
836 const struct file_operations cifs_file_strict_ops
= {
837 .read
= do_sync_read
,
838 .write
= do_sync_write
,
839 .aio_read
= cifs_strict_readv
,
840 .aio_write
= cifs_strict_writev
,
842 .release
= cifs_close
,
844 .fsync
= cifs_strict_fsync
,
846 .mmap
= cifs_file_strict_mmap
,
847 .splice_read
= generic_file_splice_read
,
848 .llseek
= cifs_llseek
,
849 #ifdef CONFIG_CIFS_POSIX
850 .unlocked_ioctl
= cifs_ioctl
,
851 #endif /* CONFIG_CIFS_POSIX */
852 .setlease
= cifs_setlease
,
855 const struct file_operations cifs_file_direct_ops
= {
856 /* BB reevaluate whether they can be done with directio, no cache */
857 .read
= do_sync_read
,
858 .write
= do_sync_write
,
859 .aio_read
= cifs_user_readv
,
860 .aio_write
= cifs_user_writev
,
862 .release
= cifs_close
,
866 .mmap
= cifs_file_mmap
,
867 .splice_read
= generic_file_splice_read
,
868 #ifdef CONFIG_CIFS_POSIX
869 .unlocked_ioctl
= cifs_ioctl
,
870 #endif /* CONFIG_CIFS_POSIX */
871 .llseek
= cifs_llseek
,
872 .setlease
= cifs_setlease
,
875 const struct file_operations cifs_file_nobrl_ops
= {
876 .read
= do_sync_read
,
877 .write
= do_sync_write
,
878 .aio_read
= generic_file_aio_read
,
879 .aio_write
= cifs_file_aio_write
,
881 .release
= cifs_close
,
884 .mmap
= cifs_file_mmap
,
885 .splice_read
= generic_file_splice_read
,
886 .llseek
= cifs_llseek
,
887 #ifdef CONFIG_CIFS_POSIX
888 .unlocked_ioctl
= cifs_ioctl
,
889 #endif /* CONFIG_CIFS_POSIX */
890 .setlease
= cifs_setlease
,
893 const struct file_operations cifs_file_strict_nobrl_ops
= {
894 .read
= do_sync_read
,
895 .write
= do_sync_write
,
896 .aio_read
= cifs_strict_readv
,
897 .aio_write
= cifs_strict_writev
,
899 .release
= cifs_close
,
900 .fsync
= cifs_strict_fsync
,
902 .mmap
= cifs_file_strict_mmap
,
903 .splice_read
= generic_file_splice_read
,
904 .llseek
= cifs_llseek
,
905 #ifdef CONFIG_CIFS_POSIX
906 .unlocked_ioctl
= cifs_ioctl
,
907 #endif /* CONFIG_CIFS_POSIX */
908 .setlease
= cifs_setlease
,
911 const struct file_operations cifs_file_direct_nobrl_ops
= {
912 /* BB reevaluate whether they can be done with directio, no cache */
913 .read
= do_sync_read
,
914 .write
= do_sync_write
,
915 .aio_read
= cifs_user_readv
,
916 .aio_write
= cifs_user_writev
,
918 .release
= cifs_close
,
921 .mmap
= cifs_file_mmap
,
922 .splice_read
= generic_file_splice_read
,
923 #ifdef CONFIG_CIFS_POSIX
924 .unlocked_ioctl
= cifs_ioctl
,
925 #endif /* CONFIG_CIFS_POSIX */
926 .llseek
= cifs_llseek
,
927 .setlease
= cifs_setlease
,
930 const struct file_operations cifs_dir_ops
= {
931 .readdir
= cifs_readdir
,
932 .release
= cifs_closedir
,
933 .read
= generic_read_dir
,
934 .unlocked_ioctl
= cifs_ioctl
,
935 .llseek
= generic_file_llseek
,
939 cifs_init_once(void *inode
)
941 struct cifsInodeInfo
*cifsi
= inode
;
943 inode_init_once(&cifsi
->vfs_inode
);
944 INIT_LIST_HEAD(&cifsi
->llist
);
945 mutex_init(&cifsi
->lock_mutex
);
949 cifs_init_inodecache(void)
951 cifs_inode_cachep
= kmem_cache_create("cifs_inode_cache",
952 sizeof(struct cifsInodeInfo
),
953 0, (SLAB_RECLAIM_ACCOUNT
|
956 if (cifs_inode_cachep
== NULL
)
963 cifs_destroy_inodecache(void)
965 kmem_cache_destroy(cifs_inode_cachep
);
969 cifs_init_request_bufs(void)
971 if (CIFSMaxBufSize
< 8192) {
972 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
973 Unicode path name has to fit in any SMB/CIFS path based frames */
974 CIFSMaxBufSize
= 8192;
975 } else if (CIFSMaxBufSize
> 1024*127) {
976 CIFSMaxBufSize
= 1024 * 127;
978 CIFSMaxBufSize
&= 0x1FE00; /* Round size to even 512 byte mult*/
980 /* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
981 cifs_req_cachep
= kmem_cache_create("cifs_request",
983 MAX_CIFS_HDR_SIZE
, 0,
984 SLAB_HWCACHE_ALIGN
, NULL
);
985 if (cifs_req_cachep
== NULL
)
988 if (cifs_min_rcv
< 1)
990 else if (cifs_min_rcv
> 64) {
992 cERROR(1, "cifs_min_rcv set to maximum (64)");
995 cifs_req_poolp
= mempool_create_slab_pool(cifs_min_rcv
,
998 if (cifs_req_poolp
== NULL
) {
999 kmem_cache_destroy(cifs_req_cachep
);
1002 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1003 almost all handle based requests (but not write response, nor is it
1004 sufficient for path based requests). A smaller size would have
1005 been more efficient (compacting multiple slab items on one 4k page)
1006 for the case in which debug was on, but this larger size allows
1007 more SMBs to use small buffer alloc and is still much more
1008 efficient to alloc 1 per page off the slab compared to 17K (5page)
1009 alloc of large cifs buffers even when page debugging is on */
1010 cifs_sm_req_cachep
= kmem_cache_create("cifs_small_rq",
1011 MAX_CIFS_SMALL_BUFFER_SIZE
, 0, SLAB_HWCACHE_ALIGN
,
1013 if (cifs_sm_req_cachep
== NULL
) {
1014 mempool_destroy(cifs_req_poolp
);
1015 kmem_cache_destroy(cifs_req_cachep
);
1019 if (cifs_min_small
< 2)
1021 else if (cifs_min_small
> 256) {
1022 cifs_min_small
= 256;
1023 cFYI(1, "cifs_min_small set to maximum (256)");
1026 cifs_sm_req_poolp
= mempool_create_slab_pool(cifs_min_small
,
1027 cifs_sm_req_cachep
);
1029 if (cifs_sm_req_poolp
== NULL
) {
1030 mempool_destroy(cifs_req_poolp
);
1031 kmem_cache_destroy(cifs_req_cachep
);
1032 kmem_cache_destroy(cifs_sm_req_cachep
);
1040 cifs_destroy_request_bufs(void)
1042 mempool_destroy(cifs_req_poolp
);
1043 kmem_cache_destroy(cifs_req_cachep
);
1044 mempool_destroy(cifs_sm_req_poolp
);
1045 kmem_cache_destroy(cifs_sm_req_cachep
);
1049 cifs_init_mids(void)
1051 cifs_mid_cachep
= kmem_cache_create("cifs_mpx_ids",
1052 sizeof(struct mid_q_entry
), 0,
1053 SLAB_HWCACHE_ALIGN
, NULL
);
1054 if (cifs_mid_cachep
== NULL
)
1057 /* 3 is a reasonable minimum number of simultaneous operations */
1058 cifs_mid_poolp
= mempool_create_slab_pool(3, cifs_mid_cachep
);
1059 if (cifs_mid_poolp
== NULL
) {
1060 kmem_cache_destroy(cifs_mid_cachep
);
1068 cifs_destroy_mids(void)
1070 mempool_destroy(cifs_mid_poolp
);
1071 kmem_cache_destroy(cifs_mid_cachep
);
1079 INIT_LIST_HEAD(&cifs_tcp_ses_list
);
1080 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1081 INIT_LIST_HEAD(&GlobalDnotifyReqList
);
1082 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q
);
1083 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1085 * Initialize Global counters
1087 atomic_set(&sesInfoAllocCount
, 0);
1088 atomic_set(&tconInfoAllocCount
, 0);
1089 atomic_set(&tcpSesAllocCount
, 0);
1090 atomic_set(&tcpSesReconnectCount
, 0);
1091 atomic_set(&tconInfoReconnectCount
, 0);
1093 atomic_set(&bufAllocCount
, 0);
1094 atomic_set(&smBufAllocCount
, 0);
1095 #ifdef CONFIG_CIFS_STATS2
1096 atomic_set(&totBufAllocCount
, 0);
1097 atomic_set(&totSmBufAllocCount
, 0);
1098 #endif /* CONFIG_CIFS_STATS2 */
1100 atomic_set(&midCount
, 0);
1101 GlobalCurrentXid
= 0;
1102 GlobalTotalActiveXid
= 0;
1103 GlobalMaxActiveXid
= 0;
1104 spin_lock_init(&cifs_tcp_ses_lock
);
1105 spin_lock_init(&cifs_file_list_lock
);
1106 spin_lock_init(&GlobalMid_Lock
);
1108 if (cifs_max_pending
< 2) {
1109 cifs_max_pending
= 2;
1110 cFYI(1, "cifs_max_pending set to min of 2");
1111 } else if (cifs_max_pending
> CIFS_MAX_REQ
) {
1112 cifs_max_pending
= CIFS_MAX_REQ
;
1113 cFYI(1, "cifs_max_pending set to max of %u", CIFS_MAX_REQ
);
1116 cifsiod_wq
= alloc_workqueue("cifsiod", WQ_FREEZABLE
|WQ_MEM_RECLAIM
, 0);
1119 goto out_clean_proc
;
1122 rc
= cifs_fscache_register();
1124 goto out_destroy_wq
;
1126 rc
= cifs_init_inodecache();
1128 goto out_unreg_fscache
;
1130 rc
= cifs_init_mids();
1132 goto out_destroy_inodecache
;
1134 rc
= cifs_init_request_bufs();
1136 goto out_destroy_mids
;
1138 #ifdef CONFIG_CIFS_UPCALL
1139 rc
= register_key_type(&cifs_spnego_key_type
);
1141 goto out_destroy_request_bufs
;
1142 #endif /* CONFIG_CIFS_UPCALL */
1144 #ifdef CONFIG_CIFS_ACL
1145 rc
= init_cifs_idmap();
1147 goto out_register_key_type
;
1148 #endif /* CONFIG_CIFS_ACL */
1150 rc
= register_filesystem(&cifs_fs_type
);
1152 goto out_init_cifs_idmap
;
1156 out_init_cifs_idmap
:
1157 #ifdef CONFIG_CIFS_ACL
1159 out_register_key_type
:
1161 #ifdef CONFIG_CIFS_UPCALL
1162 unregister_key_type(&cifs_spnego_key_type
);
1163 out_destroy_request_bufs
:
1165 cifs_destroy_request_bufs();
1167 cifs_destroy_mids();
1168 out_destroy_inodecache
:
1169 cifs_destroy_inodecache();
1171 cifs_fscache_unregister();
1173 destroy_workqueue(cifsiod_wq
);
1182 cFYI(DBG2
, "exit_cifs");
1183 unregister_filesystem(&cifs_fs_type
);
1184 cifs_dfs_release_automount_timer();
1185 #ifdef CONFIG_CIFS_ACL
1186 cifs_destroy_idmaptrees();
1189 #ifdef CONFIG_CIFS_UPCALL
1190 unregister_key_type(&cifs_spnego_key_type
);
1192 cifs_destroy_request_bufs();
1193 cifs_destroy_mids();
1194 cifs_destroy_inodecache();
1195 cifs_fscache_unregister();
1196 destroy_workqueue(cifsiod_wq
);
1200 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1201 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1203 ("VFS to access servers complying with the SNIA CIFS Specification "
1204 "e.g. Samba and Windows");
1205 MODULE_VERSION(CIFS_VERSION
);
1206 module_init(init_cifs
)
1207 module_exit(exit_cifs
)