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>
39 #include <linux/random.h>
43 #define DECLARE_GLOBALS_HERE
45 #include "cifsproto.h"
46 #include "cifs_debug.h"
47 #include "cifs_fs_sb.h"
49 #include <linux/key-type.h>
50 #include "cifs_spnego.h"
52 #ifdef CONFIG_CIFS_SMB2
58 bool enable_oplocks
= true;
59 unsigned int linuxExtEnabled
= 1;
60 unsigned int lookupCacheEnabled
= 1;
61 unsigned int global_secflags
= CIFSSEC_DEF
;
62 /* unsigned int ntlmv2_support = 0; */
63 unsigned int sign_CIFS_PDUs
= 1;
64 static const struct super_operations cifs_super_ops
;
65 unsigned int CIFSMaxBufSize
= CIFS_MAX_MSGSIZE
;
66 module_param(CIFSMaxBufSize
, uint
, 0);
67 MODULE_PARM_DESC(CIFSMaxBufSize
, "Network buffer size (not including header). "
68 "Default: 16384 Range: 8192 to 130048");
69 unsigned int cifs_min_rcv
= CIFS_MIN_RCV_POOL
;
70 module_param(cifs_min_rcv
, uint
, 0);
71 MODULE_PARM_DESC(cifs_min_rcv
, "Network buffers in pool. Default: 4 Range: "
73 unsigned int cifs_min_small
= 30;
74 module_param(cifs_min_small
, uint
, 0);
75 MODULE_PARM_DESC(cifs_min_small
, "Small network buffers in pool. Default: 30 "
77 unsigned int cifs_max_pending
= CIFS_MAX_REQ
;
78 module_param(cifs_max_pending
, uint
, 0444);
79 MODULE_PARM_DESC(cifs_max_pending
, "Simultaneous requests to server. "
80 "Default: 32767 Range: 2 to 32767.");
81 module_param(enable_oplocks
, bool, 0644);
82 MODULE_PARM_DESC(enable_oplocks
, "Enable or disable oplocks. Default: y/Y/1");
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
;
90 #ifdef CONFIG_CIFS_SMB2
91 __u8 cifs_client_guid
[SMB2_CLIENT_GUID_SIZE
];
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.
101 cifs_sb_active(struct super_block
*sb
)
103 struct cifs_sb_info
*server
= CIFS_SB(sb
);
105 if (atomic_inc_return(&server
->active
) == 1)
106 atomic_inc(&sb
->s_active
);
110 cifs_sb_deactive(struct super_block
*sb
)
112 struct cifs_sb_info
*server
= CIFS_SB(sb
);
114 if (atomic_dec_and_test(&server
->active
))
115 deactivate_super(sb
);
119 cifs_read_super(struct super_block
*sb
)
122 struct cifs_sb_info
*cifs_sb
;
125 cifs_sb
= CIFS_SB(sb
);
127 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_POSIXACL
)
128 sb
->s_flags
|= MS_POSIXACL
;
130 if (cifs_sb_master_tcon(cifs_sb
)->ses
->capabilities
& CAP_LARGE_FILES
)
131 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
133 sb
->s_maxbytes
= MAX_NON_LFS
;
135 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
136 sb
->s_time_gran
= 100;
138 sb
->s_magic
= CIFS_MAGIC_NUMBER
;
139 sb
->s_op
= &cifs_super_ops
;
140 sb
->s_bdi
= &cifs_sb
->bdi
;
141 sb
->s_blocksize
= CIFS_MAX_MSGSIZE
;
142 sb
->s_blocksize_bits
= 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
143 inode
= cifs_root_iget(sb
);
150 if (cifs_sb_master_tcon(cifs_sb
)->nocase
)
151 sb
->s_d_op
= &cifs_ci_dentry_ops
;
153 sb
->s_d_op
= &cifs_dentry_ops
;
155 sb
->s_root
= d_make_root(inode
);
161 #ifdef CONFIG_CIFS_NFSD_EXPORT
162 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) {
163 cifs_dbg(FYI
, "export ops supported\n");
164 sb
->s_export_op
= &cifs_export_ops
;
166 #endif /* CONFIG_CIFS_NFSD_EXPORT */
171 cifs_dbg(VFS
, "%s: get root inode failed\n", __func__
);
175 static void cifs_kill_sb(struct super_block
*sb
)
177 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
179 cifs_umount(cifs_sb
);
183 cifs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
185 struct super_block
*sb
= dentry
->d_sb
;
186 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
187 struct cifs_tcon
*tcon
= cifs_sb_master_tcon(cifs_sb
);
188 struct TCP_Server_Info
*server
= tcon
->ses
->server
;
195 * PATH_MAX may be too long - it would presumably be total path,
196 * but note that some servers (includinng Samba 3) have a shorter
199 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
201 buf
->f_namelen
= PATH_MAX
;
202 buf
->f_files
= 0; /* undefined */
203 buf
->f_ffree
= 0; /* unlimited */
205 if (server
->ops
->queryfs
)
206 rc
= server
->ops
->queryfs(xid
, tcon
, buf
);
212 static int cifs_permission(struct inode
*inode
, int mask
)
214 struct cifs_sb_info
*cifs_sb
;
216 cifs_sb
= CIFS_SB(inode
->i_sb
);
218 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_PERM
) {
219 if ((mask
& MAY_EXEC
) && !execute_ok(inode
))
223 } else /* file mode might have been restricted at mount time
224 on the client (above and beyond ACL on servers) for
225 servers which do not support setting and viewing mode bits,
226 so allowing client to check permissions is useful */
227 return generic_permission(inode
, mask
);
230 static struct kmem_cache
*cifs_inode_cachep
;
231 static struct kmem_cache
*cifs_req_cachep
;
232 static struct kmem_cache
*cifs_mid_cachep
;
233 static struct kmem_cache
*cifs_sm_req_cachep
;
234 mempool_t
*cifs_sm_req_poolp
;
235 mempool_t
*cifs_req_poolp
;
236 mempool_t
*cifs_mid_poolp
;
238 static struct inode
*
239 cifs_alloc_inode(struct super_block
*sb
)
241 struct cifsInodeInfo
*cifs_inode
;
242 cifs_inode
= kmem_cache_alloc(cifs_inode_cachep
, GFP_KERNEL
);
245 cifs_inode
->cifsAttrs
= 0x20; /* default */
246 cifs_inode
->time
= 0;
248 * Until the file is open and we have gotten oplock info back from the
249 * server, can not assume caching of file data or metadata.
251 cifs_set_oplock_level(cifs_inode
, 0);
252 cifs_inode
->delete_pending
= false;
253 cifs_inode
->invalid_mapping
= false;
254 cifs_inode
->vfs_inode
.i_blkbits
= 14; /* 2**14 = CIFS_MAX_MSGSIZE */
255 cifs_inode
->server_eof
= 0;
256 cifs_inode
->uniqueid
= 0;
257 cifs_inode
->createtime
= 0;
258 #ifdef CONFIG_CIFS_SMB2
259 get_random_bytes(cifs_inode
->lease_key
, SMB2_LEASE_KEY_SIZE
);
262 * Can not set i_flags here - they get immediately overwritten to zero
265 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
266 INIT_LIST_HEAD(&cifs_inode
->openFileList
);
267 INIT_LIST_HEAD(&cifs_inode
->llist
);
268 return &cifs_inode
->vfs_inode
;
271 static void cifs_i_callback(struct rcu_head
*head
)
273 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
274 kmem_cache_free(cifs_inode_cachep
, CIFS_I(inode
));
278 cifs_destroy_inode(struct inode
*inode
)
280 call_rcu(&inode
->i_rcu
, cifs_i_callback
);
284 cifs_evict_inode(struct inode
*inode
)
286 truncate_inode_pages(&inode
->i_data
, 0);
288 cifs_fscache_release_inode_cookie(inode
);
292 cifs_show_address(struct seq_file
*s
, struct TCP_Server_Info
*server
)
294 struct sockaddr_in
*sa
= (struct sockaddr_in
*) &server
->dstaddr
;
295 struct sockaddr_in6
*sa6
= (struct sockaddr_in6
*) &server
->dstaddr
;
297 seq_printf(s
, ",addr=");
299 switch (server
->dstaddr
.ss_family
) {
301 seq_printf(s
, "%pI4", &sa
->sin_addr
.s_addr
);
304 seq_printf(s
, "%pI6", &sa6
->sin6_addr
.s6_addr
);
305 if (sa6
->sin6_scope_id
)
306 seq_printf(s
, "%%%u", sa6
->sin6_scope_id
);
309 seq_printf(s
, "(unknown)");
314 cifs_show_security(struct seq_file
*s
, struct cifs_ses
*ses
)
316 if (ses
->sectype
== Unspecified
)
319 seq_printf(s
, ",sec=");
321 switch (ses
->sectype
) {
323 seq_printf(s
, "lanman");
326 seq_printf(s
, "ntlmv2");
329 seq_printf(s
, "ntlm");
332 seq_printf(s
, "krb5");
335 seq_printf(s
, "ntlmssp");
338 /* shouldn't ever happen */
339 seq_printf(s
, "unknown");
348 cifs_show_cache_flavor(struct seq_file
*s
, struct cifs_sb_info
*cifs_sb
)
350 seq_printf(s
, ",cache=");
352 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_STRICT_IO
)
353 seq_printf(s
, "strict");
354 else if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_DIRECT_IO
)
355 seq_printf(s
, "none");
357 seq_printf(s
, "loose");
361 * cifs_show_options() is for displaying mount options in /proc/mounts.
362 * Not all settable options are displayed but most of the important
366 cifs_show_options(struct seq_file
*s
, struct dentry
*root
)
368 struct cifs_sb_info
*cifs_sb
= CIFS_SB(root
->d_sb
);
369 struct cifs_tcon
*tcon
= cifs_sb_master_tcon(cifs_sb
);
370 struct sockaddr
*srcaddr
;
371 srcaddr
= (struct sockaddr
*)&tcon
->ses
->server
->srcaddr
;
373 seq_printf(s
, ",vers=%s", tcon
->ses
->server
->vals
->version_string
);
374 cifs_show_security(s
, tcon
->ses
);
375 cifs_show_cache_flavor(s
, cifs_sb
);
377 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MULTIUSER
)
378 seq_printf(s
, ",multiuser");
379 else if (tcon
->ses
->user_name
)
380 seq_printf(s
, ",username=%s", tcon
->ses
->user_name
);
382 if (tcon
->ses
->domainName
)
383 seq_printf(s
, ",domain=%s", tcon
->ses
->domainName
);
385 if (srcaddr
->sa_family
!= AF_UNSPEC
) {
386 struct sockaddr_in
*saddr4
;
387 struct sockaddr_in6
*saddr6
;
388 saddr4
= (struct sockaddr_in
*)srcaddr
;
389 saddr6
= (struct sockaddr_in6
*)srcaddr
;
390 if (srcaddr
->sa_family
== AF_INET6
)
391 seq_printf(s
, ",srcaddr=%pI6c",
393 else if (srcaddr
->sa_family
== AF_INET
)
394 seq_printf(s
, ",srcaddr=%pI4",
395 &saddr4
->sin_addr
.s_addr
);
397 seq_printf(s
, ",srcaddr=BAD-AF:%i",
398 (int)(srcaddr
->sa_family
));
401 seq_printf(s
, ",uid=%u",
402 from_kuid_munged(&init_user_ns
, cifs_sb
->mnt_uid
));
403 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_OVERR_UID
)
404 seq_printf(s
, ",forceuid");
406 seq_printf(s
, ",noforceuid");
408 seq_printf(s
, ",gid=%u",
409 from_kgid_munged(&init_user_ns
, cifs_sb
->mnt_gid
));
410 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_OVERR_GID
)
411 seq_printf(s
, ",forcegid");
413 seq_printf(s
, ",noforcegid");
415 cifs_show_address(s
, tcon
->ses
->server
);
418 seq_printf(s
, ",file_mode=0%ho,dir_mode=0%ho",
419 cifs_sb
->mnt_file_mode
,
420 cifs_sb
->mnt_dir_mode
);
422 seq_printf(s
, ",seal");
424 seq_printf(s
, ",nocase");
426 seq_printf(s
, ",hard");
428 seq_printf(s
, ",unix");
430 seq_printf(s
, ",nounix");
431 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_POSIX_PATHS
)
432 seq_printf(s
, ",posixpaths");
433 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SET_UID
)
434 seq_printf(s
, ",setuids");
435 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
)
436 seq_printf(s
, ",serverino");
437 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_RWPIDFORWARD
)
438 seq_printf(s
, ",rwpidforward");
439 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NOPOSIXBRL
)
440 seq_printf(s
, ",forcemand");
441 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_XATTR
)
442 seq_printf(s
, ",nouser_xattr");
443 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR
)
444 seq_printf(s
, ",mapchars");
445 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_UNX_EMUL
)
446 seq_printf(s
, ",sfu");
447 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_BRL
)
448 seq_printf(s
, ",nobrl");
449 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_ACL
)
450 seq_printf(s
, ",cifsacl");
451 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_DYNPERM
)
452 seq_printf(s
, ",dynperm");
453 if (root
->d_sb
->s_flags
& MS_POSIXACL
)
454 seq_printf(s
, ",acl");
455 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MF_SYMLINKS
)
456 seq_printf(s
, ",mfsymlinks");
457 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_FSCACHE
)
458 seq_printf(s
, ",fsc");
459 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NOSSYNC
)
460 seq_printf(s
, ",nostrictsync");
461 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_PERM
)
462 seq_printf(s
, ",noperm");
463 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPUID
)
464 seq_printf(s
, ",backupuid=%u",
465 from_kuid_munged(&init_user_ns
,
466 cifs_sb
->mnt_backupuid
));
467 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPGID
)
468 seq_printf(s
, ",backupgid=%u",
469 from_kgid_munged(&init_user_ns
,
470 cifs_sb
->mnt_backupgid
));
472 seq_printf(s
, ",rsize=%u", cifs_sb
->rsize
);
473 seq_printf(s
, ",wsize=%u", cifs_sb
->wsize
);
474 /* convert actimeo and display it in seconds */
475 seq_printf(s
, ",actimeo=%lu", cifs_sb
->actimeo
/ HZ
);
480 static void cifs_umount_begin(struct super_block
*sb
)
482 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
483 struct cifs_tcon
*tcon
;
488 tcon
= cifs_sb_master_tcon(cifs_sb
);
490 spin_lock(&cifs_tcp_ses_lock
);
491 if ((tcon
->tc_count
> 1) || (tcon
->tidStatus
== CifsExiting
)) {
492 /* we have other mounts to same share or we have
493 already tried to force umount this and woken up
494 all waiting network requests, nothing to do */
495 spin_unlock(&cifs_tcp_ses_lock
);
497 } else if (tcon
->tc_count
== 1)
498 tcon
->tidStatus
= CifsExiting
;
499 spin_unlock(&cifs_tcp_ses_lock
);
501 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
502 /* cancel_notify_requests(tcon); */
503 if (tcon
->ses
&& tcon
->ses
->server
) {
504 cifs_dbg(FYI
, "wake up tasks now - umount begin not complete\n");
505 wake_up_all(&tcon
->ses
->server
->request_q
);
506 wake_up_all(&tcon
->ses
->server
->response_q
);
507 msleep(1); /* yield */
508 /* we have to kick the requests once more */
509 wake_up_all(&tcon
->ses
->server
->response_q
);
516 #ifdef CONFIG_CIFS_STATS2
517 static int cifs_show_stats(struct seq_file
*s
, struct dentry
*root
)
524 static int cifs_remount(struct super_block
*sb
, int *flags
, char *data
)
526 *flags
|= MS_NODIRATIME
;
530 static int cifs_drop_inode(struct inode
*inode
)
532 struct cifs_sb_info
*cifs_sb
= CIFS_SB(inode
->i_sb
);
534 /* no serverino => unconditional eviction */
535 return !(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) ||
536 generic_drop_inode(inode
);
539 static const struct super_operations cifs_super_ops
= {
540 .statfs
= cifs_statfs
,
541 .alloc_inode
= cifs_alloc_inode
,
542 .destroy_inode
= cifs_destroy_inode
,
543 .drop_inode
= cifs_drop_inode
,
544 .evict_inode
= cifs_evict_inode
,
545 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
546 function unless later we add lazy close of inodes or unless the
547 kernel forgets to call us with the same number of releases (closes)
549 .show_options
= cifs_show_options
,
550 .umount_begin
= cifs_umount_begin
,
551 .remount_fs
= cifs_remount
,
552 #ifdef CONFIG_CIFS_STATS2
553 .show_stats
= cifs_show_stats
,
558 * Get root dentry from superblock according to prefix path mount option.
559 * Return dentry with refcount + 1 on success and NULL otherwise.
561 static struct dentry
*
562 cifs_get_root(struct smb_vol
*vol
, struct super_block
*sb
)
564 struct dentry
*dentry
;
565 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
566 char *full_path
= NULL
;
570 full_path
= cifs_build_path_to_root(vol
, cifs_sb
,
571 cifs_sb_master_tcon(cifs_sb
));
572 if (full_path
== NULL
)
573 return ERR_PTR(-ENOMEM
);
575 cifs_dbg(FYI
, "Get root dentry for %s\n", full_path
);
577 sep
= CIFS_DIR_SEP(cifs_sb
);
578 dentry
= dget(sb
->s_root
);
582 struct inode
*dir
= dentry
->d_inode
;
583 struct dentry
*child
;
587 dentry
= ERR_PTR(-ENOENT
);
590 if (!S_ISDIR(dir
->i_mode
)) {
592 dentry
= ERR_PTR(-ENOTDIR
);
596 /* skip separators */
603 while (*s
&& *s
!= sep
)
606 mutex_lock(&dir
->i_mutex
);
607 child
= lookup_one_len(p
, dentry
, s
- p
);
608 mutex_unlock(&dir
->i_mutex
);
611 } while (!IS_ERR(dentry
));
616 static int cifs_set_super(struct super_block
*sb
, void *data
)
618 struct cifs_mnt_data
*mnt_data
= data
;
619 sb
->s_fs_info
= mnt_data
->cifs_sb
;
620 return set_anon_super(sb
, NULL
);
623 static struct dentry
*
624 cifs_do_mount(struct file_system_type
*fs_type
,
625 int flags
, const char *dev_name
, void *data
)
628 struct super_block
*sb
;
629 struct cifs_sb_info
*cifs_sb
;
630 struct smb_vol
*volume_info
;
631 struct cifs_mnt_data mnt_data
;
634 cifs_dbg(FYI
, "Devname: %s flags: %d\n", dev_name
, flags
);
636 volume_info
= cifs_get_volume_info((char *)data
, dev_name
);
637 if (IS_ERR(volume_info
))
638 return ERR_CAST(volume_info
);
640 cifs_sb
= kzalloc(sizeof(struct cifs_sb_info
), GFP_KERNEL
);
641 if (cifs_sb
== NULL
) {
642 root
= ERR_PTR(-ENOMEM
);
646 cifs_sb
->mountdata
= kstrndup(data
, PAGE_SIZE
, GFP_KERNEL
);
647 if (cifs_sb
->mountdata
== NULL
) {
648 root
= ERR_PTR(-ENOMEM
);
652 cifs_setup_cifs_sb(volume_info
, cifs_sb
);
654 rc
= cifs_mount(cifs_sb
, volume_info
);
656 if (!(flags
& MS_SILENT
))
657 cifs_dbg(VFS
, "cifs_mount failed w/return code = %d\n",
663 mnt_data
.vol
= volume_info
;
664 mnt_data
.cifs_sb
= cifs_sb
;
665 mnt_data
.flags
= flags
;
667 /* BB should we make this contingent on mount parm? */
668 flags
|= MS_NODIRATIME
| MS_NOATIME
;
670 sb
= sget(fs_type
, cifs_match_super
, cifs_set_super
, flags
, &mnt_data
);
673 cifs_umount(cifs_sb
);
678 cifs_dbg(FYI
, "Use existing superblock\n");
679 cifs_umount(cifs_sb
);
681 rc
= cifs_read_super(sb
);
687 sb
->s_flags
|= MS_ACTIVE
;
690 root
= cifs_get_root(volume_info
, sb
);
694 cifs_dbg(FYI
, "dentry root is: %p\n", root
);
698 deactivate_locked_super(sb
);
700 cifs_cleanup_volume_info(volume_info
);
704 kfree(cifs_sb
->mountdata
);
708 unload_nls(volume_info
->local_nls
);
712 static ssize_t
cifs_file_aio_write(struct kiocb
*iocb
, const struct iovec
*iov
,
713 unsigned long nr_segs
, loff_t pos
)
715 struct inode
*inode
= file_inode(iocb
->ki_filp
);
719 written
= generic_file_aio_write(iocb
, iov
, nr_segs
, pos
);
721 if (CIFS_I(inode
)->clientCanCacheAll
)
724 rc
= filemap_fdatawrite(inode
->i_mapping
);
726 cifs_dbg(FYI
, "cifs_file_aio_write: %d rc on %p inode\n",
732 static loff_t
cifs_llseek(struct file
*file
, loff_t offset
, int whence
)
735 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
736 * the cached file length
738 if (whence
!= SEEK_SET
&& whence
!= SEEK_CUR
) {
740 struct inode
*inode
= file_inode(file
);
743 * We need to be sure that all dirty pages are written and the
744 * server has the newest file length.
746 if (!CIFS_I(inode
)->clientCanCacheRead
&& inode
->i_mapping
&&
747 inode
->i_mapping
->nrpages
!= 0) {
748 rc
= filemap_fdatawait(inode
->i_mapping
);
750 mapping_set_error(inode
->i_mapping
, rc
);
755 * Some applications poll for the file length in this strange
756 * way so we must seek to end on non-oplocked files by
757 * setting the revalidate time to zero.
759 CIFS_I(inode
)->time
= 0;
761 rc
= cifs_revalidate_file_attr(file
);
765 return generic_file_llseek(file
, offset
, whence
);
768 static int cifs_setlease(struct file
*file
, long arg
, struct file_lock
**lease
)
770 /* note that this is called by vfs setlease with i_lock held
771 to protect *lease from going away */
772 struct inode
*inode
= file_inode(file
);
773 struct cifsFileInfo
*cfile
= file
->private_data
;
775 if (!(S_ISREG(inode
->i_mode
)))
778 /* check if file is oplocked */
779 if (((arg
== F_RDLCK
) &&
780 (CIFS_I(inode
)->clientCanCacheRead
)) ||
782 (CIFS_I(inode
)->clientCanCacheAll
)))
783 return generic_setlease(file
, arg
, lease
);
784 else if (tlink_tcon(cfile
->tlink
)->local_lease
&&
785 !CIFS_I(inode
)->clientCanCacheRead
)
786 /* If the server claims to support oplock on this
787 file, then we still need to check oplock even
788 if the local_lease mount option is set, but there
789 are servers which do not support oplock for which
790 this mount option may be useful if the user
791 knows that the file won't be changed on the server
793 return generic_setlease(file
, arg
, lease
);
798 struct file_system_type cifs_fs_type
= {
799 .owner
= THIS_MODULE
,
801 .mount
= cifs_do_mount
,
802 .kill_sb
= cifs_kill_sb
,
805 MODULE_ALIAS_FS("cifs");
806 const struct inode_operations cifs_dir_inode_ops
= {
807 .create
= cifs_create
,
808 .atomic_open
= cifs_atomic_open
,
809 .lookup
= cifs_lookup
,
810 .getattr
= cifs_getattr
,
811 .unlink
= cifs_unlink
,
812 .link
= cifs_hardlink
,
815 .rename
= cifs_rename
,
816 .permission
= cifs_permission
,
817 /* revalidate:cifs_revalidate, */
818 .setattr
= cifs_setattr
,
819 .symlink
= cifs_symlink
,
821 #ifdef CONFIG_CIFS_XATTR
822 .setxattr
= cifs_setxattr
,
823 .getxattr
= cifs_getxattr
,
824 .listxattr
= cifs_listxattr
,
825 .removexattr
= cifs_removexattr
,
829 const struct inode_operations cifs_file_inode_ops
= {
830 /* revalidate:cifs_revalidate, */
831 .setattr
= cifs_setattr
,
832 .getattr
= cifs_getattr
, /* do we need this anymore? */
833 .rename
= cifs_rename
,
834 .permission
= cifs_permission
,
835 #ifdef CONFIG_CIFS_XATTR
836 .setxattr
= cifs_setxattr
,
837 .getxattr
= cifs_getxattr
,
838 .listxattr
= cifs_listxattr
,
839 .removexattr
= cifs_removexattr
,
843 const struct inode_operations cifs_symlink_inode_ops
= {
844 .readlink
= generic_readlink
,
845 .follow_link
= cifs_follow_link
,
846 .put_link
= cifs_put_link
,
847 .permission
= cifs_permission
,
848 /* BB add the following two eventually */
849 /* revalidate: cifs_revalidate,
850 setattr: cifs_notify_change, *//* BB do we need notify change */
851 #ifdef CONFIG_CIFS_XATTR
852 .setxattr
= cifs_setxattr
,
853 .getxattr
= cifs_getxattr
,
854 .listxattr
= cifs_listxattr
,
855 .removexattr
= cifs_removexattr
,
859 const struct file_operations cifs_file_ops
= {
860 .read
= do_sync_read
,
861 .write
= do_sync_write
,
862 .aio_read
= generic_file_aio_read
,
863 .aio_write
= cifs_file_aio_write
,
865 .release
= cifs_close
,
869 .mmap
= cifs_file_mmap
,
870 .splice_read
= generic_file_splice_read
,
871 .llseek
= cifs_llseek
,
872 #ifdef CONFIG_CIFS_POSIX
873 .unlocked_ioctl
= cifs_ioctl
,
874 #endif /* CONFIG_CIFS_POSIX */
875 .setlease
= cifs_setlease
,
878 const struct file_operations cifs_file_strict_ops
= {
879 .read
= do_sync_read
,
880 .write
= do_sync_write
,
881 .aio_read
= cifs_strict_readv
,
882 .aio_write
= cifs_strict_writev
,
884 .release
= cifs_close
,
886 .fsync
= cifs_strict_fsync
,
888 .mmap
= cifs_file_strict_mmap
,
889 .splice_read
= generic_file_splice_read
,
890 .llseek
= cifs_llseek
,
891 #ifdef CONFIG_CIFS_POSIX
892 .unlocked_ioctl
= cifs_ioctl
,
893 #endif /* CONFIG_CIFS_POSIX */
894 .setlease
= cifs_setlease
,
897 const struct file_operations cifs_file_direct_ops
= {
898 /* BB reevaluate whether they can be done with directio, no cache */
899 .read
= do_sync_read
,
900 .write
= do_sync_write
,
901 .aio_read
= cifs_user_readv
,
902 .aio_write
= cifs_user_writev
,
904 .release
= cifs_close
,
908 .mmap
= cifs_file_mmap
,
909 .splice_read
= generic_file_splice_read
,
910 #ifdef CONFIG_CIFS_POSIX
911 .unlocked_ioctl
= cifs_ioctl
,
912 #endif /* CONFIG_CIFS_POSIX */
913 .llseek
= cifs_llseek
,
914 .setlease
= cifs_setlease
,
917 const struct file_operations cifs_file_nobrl_ops
= {
918 .read
= do_sync_read
,
919 .write
= do_sync_write
,
920 .aio_read
= generic_file_aio_read
,
921 .aio_write
= cifs_file_aio_write
,
923 .release
= cifs_close
,
926 .mmap
= cifs_file_mmap
,
927 .splice_read
= generic_file_splice_read
,
928 .llseek
= cifs_llseek
,
929 #ifdef CONFIG_CIFS_POSIX
930 .unlocked_ioctl
= cifs_ioctl
,
931 #endif /* CONFIG_CIFS_POSIX */
932 .setlease
= cifs_setlease
,
935 const struct file_operations cifs_file_strict_nobrl_ops
= {
936 .read
= do_sync_read
,
937 .write
= do_sync_write
,
938 .aio_read
= cifs_strict_readv
,
939 .aio_write
= cifs_strict_writev
,
941 .release
= cifs_close
,
942 .fsync
= cifs_strict_fsync
,
944 .mmap
= cifs_file_strict_mmap
,
945 .splice_read
= generic_file_splice_read
,
946 .llseek
= cifs_llseek
,
947 #ifdef CONFIG_CIFS_POSIX
948 .unlocked_ioctl
= cifs_ioctl
,
949 #endif /* CONFIG_CIFS_POSIX */
950 .setlease
= cifs_setlease
,
953 const struct file_operations cifs_file_direct_nobrl_ops
= {
954 /* BB reevaluate whether they can be done with directio, no cache */
955 .read
= do_sync_read
,
956 .write
= do_sync_write
,
957 .aio_read
= cifs_user_readv
,
958 .aio_write
= cifs_user_writev
,
960 .release
= cifs_close
,
963 .mmap
= cifs_file_mmap
,
964 .splice_read
= generic_file_splice_read
,
965 #ifdef CONFIG_CIFS_POSIX
966 .unlocked_ioctl
= cifs_ioctl
,
967 #endif /* CONFIG_CIFS_POSIX */
968 .llseek
= cifs_llseek
,
969 .setlease
= cifs_setlease
,
972 const struct file_operations cifs_dir_ops
= {
973 .iterate
= cifs_readdir
,
974 .release
= cifs_closedir
,
975 .read
= generic_read_dir
,
976 .unlocked_ioctl
= cifs_ioctl
,
977 .llseek
= generic_file_llseek
,
981 cifs_init_once(void *inode
)
983 struct cifsInodeInfo
*cifsi
= inode
;
985 inode_init_once(&cifsi
->vfs_inode
);
986 init_rwsem(&cifsi
->lock_sem
);
990 cifs_init_inodecache(void)
992 cifs_inode_cachep
= kmem_cache_create("cifs_inode_cache",
993 sizeof(struct cifsInodeInfo
),
994 0, (SLAB_RECLAIM_ACCOUNT
|
997 if (cifs_inode_cachep
== NULL
)
1004 cifs_destroy_inodecache(void)
1007 * Make sure all delayed rcu free inodes are flushed before we
1011 kmem_cache_destroy(cifs_inode_cachep
);
1015 cifs_init_request_bufs(void)
1017 size_t max_hdr_size
= MAX_CIFS_HDR_SIZE
;
1018 #ifdef CONFIG_CIFS_SMB2
1020 * SMB2 maximum header size is bigger than CIFS one - no problems to
1021 * allocate some more bytes for CIFS.
1023 max_hdr_size
= MAX_SMB2_HDR_SIZE
;
1025 if (CIFSMaxBufSize
< 8192) {
1026 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1027 Unicode path name has to fit in any SMB/CIFS path based frames */
1028 CIFSMaxBufSize
= 8192;
1029 } else if (CIFSMaxBufSize
> 1024*127) {
1030 CIFSMaxBufSize
= 1024 * 127;
1032 CIFSMaxBufSize
&= 0x1FE00; /* Round size to even 512 byte mult*/
1035 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1036 CIFSMaxBufSize, CIFSMaxBufSize);
1038 cifs_req_cachep
= kmem_cache_create("cifs_request",
1039 CIFSMaxBufSize
+ max_hdr_size
, 0,
1040 SLAB_HWCACHE_ALIGN
, NULL
);
1041 if (cifs_req_cachep
== NULL
)
1044 if (cifs_min_rcv
< 1)
1046 else if (cifs_min_rcv
> 64) {
1048 cifs_dbg(VFS
, "cifs_min_rcv set to maximum (64)\n");
1051 cifs_req_poolp
= mempool_create_slab_pool(cifs_min_rcv
,
1054 if (cifs_req_poolp
== NULL
) {
1055 kmem_cache_destroy(cifs_req_cachep
);
1058 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1059 almost all handle based requests (but not write response, nor is it
1060 sufficient for path based requests). A smaller size would have
1061 been more efficient (compacting multiple slab items on one 4k page)
1062 for the case in which debug was on, but this larger size allows
1063 more SMBs to use small buffer alloc and is still much more
1064 efficient to alloc 1 per page off the slab compared to 17K (5page)
1065 alloc of large cifs buffers even when page debugging is on */
1066 cifs_sm_req_cachep
= kmem_cache_create("cifs_small_rq",
1067 MAX_CIFS_SMALL_BUFFER_SIZE
, 0, SLAB_HWCACHE_ALIGN
,
1069 if (cifs_sm_req_cachep
== NULL
) {
1070 mempool_destroy(cifs_req_poolp
);
1071 kmem_cache_destroy(cifs_req_cachep
);
1075 if (cifs_min_small
< 2)
1077 else if (cifs_min_small
> 256) {
1078 cifs_min_small
= 256;
1079 cifs_dbg(FYI
, "cifs_min_small set to maximum (256)\n");
1082 cifs_sm_req_poolp
= mempool_create_slab_pool(cifs_min_small
,
1083 cifs_sm_req_cachep
);
1085 if (cifs_sm_req_poolp
== NULL
) {
1086 mempool_destroy(cifs_req_poolp
);
1087 kmem_cache_destroy(cifs_req_cachep
);
1088 kmem_cache_destroy(cifs_sm_req_cachep
);
1096 cifs_destroy_request_bufs(void)
1098 mempool_destroy(cifs_req_poolp
);
1099 kmem_cache_destroy(cifs_req_cachep
);
1100 mempool_destroy(cifs_sm_req_poolp
);
1101 kmem_cache_destroy(cifs_sm_req_cachep
);
1105 cifs_init_mids(void)
1107 cifs_mid_cachep
= kmem_cache_create("cifs_mpx_ids",
1108 sizeof(struct mid_q_entry
), 0,
1109 SLAB_HWCACHE_ALIGN
, NULL
);
1110 if (cifs_mid_cachep
== NULL
)
1113 /* 3 is a reasonable minimum number of simultaneous operations */
1114 cifs_mid_poolp
= mempool_create_slab_pool(3, cifs_mid_cachep
);
1115 if (cifs_mid_poolp
== NULL
) {
1116 kmem_cache_destroy(cifs_mid_cachep
);
1124 cifs_destroy_mids(void)
1126 mempool_destroy(cifs_mid_poolp
);
1127 kmem_cache_destroy(cifs_mid_cachep
);
1135 INIT_LIST_HEAD(&cifs_tcp_ses_list
);
1136 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1137 INIT_LIST_HEAD(&GlobalDnotifyReqList
);
1138 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q
);
1139 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1141 * Initialize Global counters
1143 atomic_set(&sesInfoAllocCount
, 0);
1144 atomic_set(&tconInfoAllocCount
, 0);
1145 atomic_set(&tcpSesAllocCount
, 0);
1146 atomic_set(&tcpSesReconnectCount
, 0);
1147 atomic_set(&tconInfoReconnectCount
, 0);
1149 atomic_set(&bufAllocCount
, 0);
1150 atomic_set(&smBufAllocCount
, 0);
1151 #ifdef CONFIG_CIFS_STATS2
1152 atomic_set(&totBufAllocCount
, 0);
1153 atomic_set(&totSmBufAllocCount
, 0);
1154 #endif /* CONFIG_CIFS_STATS2 */
1156 atomic_set(&midCount
, 0);
1157 GlobalCurrentXid
= 0;
1158 GlobalTotalActiveXid
= 0;
1159 GlobalMaxActiveXid
= 0;
1160 spin_lock_init(&cifs_tcp_ses_lock
);
1161 spin_lock_init(&cifs_file_list_lock
);
1162 spin_lock_init(&GlobalMid_Lock
);
1164 #ifdef CONFIG_CIFS_SMB2
1165 get_random_bytes(cifs_client_guid
, SMB2_CLIENT_GUID_SIZE
);
1168 if (cifs_max_pending
< 2) {
1169 cifs_max_pending
= 2;
1170 cifs_dbg(FYI
, "cifs_max_pending set to min of 2\n");
1171 } else if (cifs_max_pending
> CIFS_MAX_REQ
) {
1172 cifs_max_pending
= CIFS_MAX_REQ
;
1173 cifs_dbg(FYI
, "cifs_max_pending set to max of %u\n",
1177 cifsiod_wq
= alloc_workqueue("cifsiod", WQ_FREEZABLE
|WQ_MEM_RECLAIM
, 0);
1180 goto out_clean_proc
;
1183 rc
= cifs_fscache_register();
1185 goto out_destroy_wq
;
1187 rc
= cifs_init_inodecache();
1189 goto out_unreg_fscache
;
1191 rc
= cifs_init_mids();
1193 goto out_destroy_inodecache
;
1195 rc
= cifs_init_request_bufs();
1197 goto out_destroy_mids
;
1199 #ifdef CONFIG_CIFS_UPCALL
1200 rc
= register_key_type(&cifs_spnego_key_type
);
1202 goto out_destroy_request_bufs
;
1203 #endif /* CONFIG_CIFS_UPCALL */
1205 #ifdef CONFIG_CIFS_ACL
1206 rc
= init_cifs_idmap();
1208 goto out_register_key_type
;
1209 #endif /* CONFIG_CIFS_ACL */
1211 rc
= register_filesystem(&cifs_fs_type
);
1213 goto out_init_cifs_idmap
;
1217 out_init_cifs_idmap
:
1218 #ifdef CONFIG_CIFS_ACL
1220 out_register_key_type
:
1222 #ifdef CONFIG_CIFS_UPCALL
1223 unregister_key_type(&cifs_spnego_key_type
);
1224 out_destroy_request_bufs
:
1226 cifs_destroy_request_bufs();
1228 cifs_destroy_mids();
1229 out_destroy_inodecache
:
1230 cifs_destroy_inodecache();
1232 cifs_fscache_unregister();
1234 destroy_workqueue(cifsiod_wq
);
1243 cifs_dbg(NOISY
, "exit_cifs\n");
1244 unregister_filesystem(&cifs_fs_type
);
1245 cifs_dfs_release_automount_timer();
1246 #ifdef CONFIG_CIFS_ACL
1249 #ifdef CONFIG_CIFS_UPCALL
1250 unregister_key_type(&cifs_spnego_key_type
);
1252 cifs_destroy_request_bufs();
1253 cifs_destroy_mids();
1254 cifs_destroy_inodecache();
1255 cifs_fscache_unregister();
1256 destroy_workqueue(cifsiod_wq
);
1260 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1261 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1263 ("VFS to access servers complying with the SNIA CIFS Specification "
1264 "e.g. Samba and Windows");
1265 MODULE_VERSION(CIFS_VERSION
);
1266 module_init(init_cifs
)
1267 module_exit(exit_cifs
)