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
;
91 * Bumps refcount for cifs super block.
92 * Note that it should be only called if a referece to VFS super block is
93 * already held, e.g. in open-type syscalls context. Otherwise it can race with
94 * atomic_dec_and_test in deactivate_locked_super.
97 cifs_sb_active(struct super_block
*sb
)
99 struct cifs_sb_info
*server
= CIFS_SB(sb
);
101 if (atomic_inc_return(&server
->active
) == 1)
102 atomic_inc(&sb
->s_active
);
106 cifs_sb_deactive(struct super_block
*sb
)
108 struct cifs_sb_info
*server
= CIFS_SB(sb
);
110 if (atomic_dec_and_test(&server
->active
))
111 deactivate_super(sb
);
115 cifs_read_super(struct super_block
*sb
)
118 struct cifs_sb_info
*cifs_sb
;
119 struct cifs_tcon
*tcon
;
122 cifs_sb
= CIFS_SB(sb
);
123 tcon
= cifs_sb_master_tcon(cifs_sb
);
125 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_POSIXACL
)
126 sb
->s_flags
|= MS_POSIXACL
;
128 if (tcon
->ses
->capabilities
& tcon
->ses
->server
->vals
->cap_large_files
)
129 sb
->s_maxbytes
= MAX_LFS_FILESIZE
;
131 sb
->s_maxbytes
= MAX_NON_LFS
;
133 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
134 sb
->s_time_gran
= 100;
136 sb
->s_magic
= CIFS_MAGIC_NUMBER
;
137 sb
->s_op
= &cifs_super_ops
;
138 sb
->s_bdi
= &cifs_sb
->bdi
;
139 sb
->s_blocksize
= CIFS_MAX_MSGSIZE
;
140 sb
->s_blocksize_bits
= 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
141 inode
= cifs_root_iget(sb
);
149 sb
->s_d_op
= &cifs_ci_dentry_ops
;
151 sb
->s_d_op
= &cifs_dentry_ops
;
153 sb
->s_root
= d_make_root(inode
);
159 #ifdef CONFIG_CIFS_NFSD_EXPORT
160 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) {
161 cifs_dbg(FYI
, "export ops supported\n");
162 sb
->s_export_op
= &cifs_export_ops
;
164 #endif /* CONFIG_CIFS_NFSD_EXPORT */
169 cifs_dbg(VFS
, "%s: get root inode failed\n", __func__
);
173 static void cifs_kill_sb(struct super_block
*sb
)
175 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
177 cifs_umount(cifs_sb
);
181 cifs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
183 struct super_block
*sb
= dentry
->d_sb
;
184 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
185 struct cifs_tcon
*tcon
= cifs_sb_master_tcon(cifs_sb
);
186 struct TCP_Server_Info
*server
= tcon
->ses
->server
;
193 * PATH_MAX may be too long - it would presumably be total path,
194 * but note that some servers (includinng Samba 3) have a shorter
197 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
199 buf
->f_namelen
= PATH_MAX
;
200 buf
->f_files
= 0; /* undefined */
201 buf
->f_ffree
= 0; /* unlimited */
203 if (server
->ops
->queryfs
)
204 rc
= server
->ops
->queryfs(xid
, tcon
, buf
);
210 static long cifs_fallocate(struct file
*file
, int mode
, loff_t off
, loff_t len
)
212 struct cifs_sb_info
*cifs_sb
= CIFS_FILE_SB(file
);
213 struct cifs_tcon
*tcon
= cifs_sb_master_tcon(cifs_sb
);
214 struct TCP_Server_Info
*server
= tcon
->ses
->server
;
216 if (server
->ops
->fallocate
)
217 return server
->ops
->fallocate(file
, tcon
, mode
, off
, len
);
222 static int cifs_permission(struct inode
*inode
, int mask
)
224 struct cifs_sb_info
*cifs_sb
;
226 cifs_sb
= CIFS_SB(inode
->i_sb
);
228 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_PERM
) {
229 if ((mask
& MAY_EXEC
) && !execute_ok(inode
))
233 } else /* file mode might have been restricted at mount time
234 on the client (above and beyond ACL on servers) for
235 servers which do not support setting and viewing mode bits,
236 so allowing client to check permissions is useful */
237 return generic_permission(inode
, mask
);
240 static struct kmem_cache
*cifs_inode_cachep
;
241 static struct kmem_cache
*cifs_req_cachep
;
242 static struct kmem_cache
*cifs_mid_cachep
;
243 static struct kmem_cache
*cifs_sm_req_cachep
;
244 mempool_t
*cifs_sm_req_poolp
;
245 mempool_t
*cifs_req_poolp
;
246 mempool_t
*cifs_mid_poolp
;
248 static struct inode
*
249 cifs_alloc_inode(struct super_block
*sb
)
251 struct cifsInodeInfo
*cifs_inode
;
252 cifs_inode
= kmem_cache_alloc(cifs_inode_cachep
, GFP_KERNEL
);
255 cifs_inode
->cifsAttrs
= 0x20; /* default */
256 cifs_inode
->time
= 0;
258 * Until the file is open and we have gotten oplock info back from the
259 * server, can not assume caching of file data or metadata.
261 cifs_set_oplock_level(cifs_inode
, 0);
262 cifs_inode
->flags
= 0;
263 spin_lock_init(&cifs_inode
->writers_lock
);
264 cifs_inode
->writers
= 0;
265 cifs_inode
->vfs_inode
.i_blkbits
= 14; /* 2**14 = CIFS_MAX_MSGSIZE */
266 cifs_inode
->server_eof
= 0;
267 cifs_inode
->uniqueid
= 0;
268 cifs_inode
->createtime
= 0;
269 cifs_inode
->epoch
= 0;
270 #ifdef CONFIG_CIFS_SMB2
271 get_random_bytes(cifs_inode
->lease_key
, SMB2_LEASE_KEY_SIZE
);
274 * Can not set i_flags here - they get immediately overwritten to zero
277 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
278 INIT_LIST_HEAD(&cifs_inode
->openFileList
);
279 INIT_LIST_HEAD(&cifs_inode
->llist
);
280 return &cifs_inode
->vfs_inode
;
283 static void cifs_i_callback(struct rcu_head
*head
)
285 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
286 kmem_cache_free(cifs_inode_cachep
, CIFS_I(inode
));
290 cifs_destroy_inode(struct inode
*inode
)
292 call_rcu(&inode
->i_rcu
, cifs_i_callback
);
296 cifs_evict_inode(struct inode
*inode
)
298 truncate_inode_pages_final(&inode
->i_data
);
300 cifs_fscache_release_inode_cookie(inode
);
304 cifs_show_address(struct seq_file
*s
, struct TCP_Server_Info
*server
)
306 struct sockaddr_in
*sa
= (struct sockaddr_in
*) &server
->dstaddr
;
307 struct sockaddr_in6
*sa6
= (struct sockaddr_in6
*) &server
->dstaddr
;
309 seq_puts(s
, ",addr=");
311 switch (server
->dstaddr
.ss_family
) {
313 seq_printf(s
, "%pI4", &sa
->sin_addr
.s_addr
);
316 seq_printf(s
, "%pI6", &sa6
->sin6_addr
.s6_addr
);
317 if (sa6
->sin6_scope_id
)
318 seq_printf(s
, "%%%u", sa6
->sin6_scope_id
);
321 seq_puts(s
, "(unknown)");
326 cifs_show_security(struct seq_file
*s
, struct cifs_ses
*ses
)
328 if (ses
->sectype
== Unspecified
) {
329 if (ses
->user_name
== NULL
)
330 seq_puts(s
, ",sec=none");
334 seq_puts(s
, ",sec=");
336 switch (ses
->sectype
) {
338 seq_puts(s
, "lanman");
341 seq_puts(s
, "ntlmv2");
350 seq_puts(s
, "ntlmssp");
353 /* shouldn't ever happen */
354 seq_puts(s
, "unknown");
363 cifs_show_cache_flavor(struct seq_file
*s
, struct cifs_sb_info
*cifs_sb
)
365 seq_puts(s
, ",cache=");
367 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_STRICT_IO
)
368 seq_puts(s
, "strict");
369 else if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_DIRECT_IO
)
372 seq_puts(s
, "loose");
376 cifs_show_nls(struct seq_file
*s
, struct nls_table
*cur
)
378 struct nls_table
*def
;
380 /* Display iocharset= option if it's not default charset */
381 def
= load_nls_default();
383 seq_printf(s
, ",iocharset=%s", cur
->charset
);
388 * cifs_show_options() is for displaying mount options in /proc/mounts.
389 * Not all settable options are displayed but most of the important
393 cifs_show_options(struct seq_file
*s
, struct dentry
*root
)
395 struct cifs_sb_info
*cifs_sb
= CIFS_SB(root
->d_sb
);
396 struct cifs_tcon
*tcon
= cifs_sb_master_tcon(cifs_sb
);
397 struct sockaddr
*srcaddr
;
398 srcaddr
= (struct sockaddr
*)&tcon
->ses
->server
->srcaddr
;
400 seq_show_option(s
, "vers", tcon
->ses
->server
->vals
->version_string
);
401 cifs_show_security(s
, tcon
->ses
);
402 cifs_show_cache_flavor(s
, cifs_sb
);
404 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MULTIUSER
)
405 seq_puts(s
, ",multiuser");
406 else if (tcon
->ses
->user_name
)
407 seq_show_option(s
, "username", tcon
->ses
->user_name
);
409 if (tcon
->ses
->domainName
)
410 seq_show_option(s
, "domain", tcon
->ses
->domainName
);
412 if (srcaddr
->sa_family
!= AF_UNSPEC
) {
413 struct sockaddr_in
*saddr4
;
414 struct sockaddr_in6
*saddr6
;
415 saddr4
= (struct sockaddr_in
*)srcaddr
;
416 saddr6
= (struct sockaddr_in6
*)srcaddr
;
417 if (srcaddr
->sa_family
== AF_INET6
)
418 seq_printf(s
, ",srcaddr=%pI6c",
420 else if (srcaddr
->sa_family
== AF_INET
)
421 seq_printf(s
, ",srcaddr=%pI4",
422 &saddr4
->sin_addr
.s_addr
);
424 seq_printf(s
, ",srcaddr=BAD-AF:%i",
425 (int)(srcaddr
->sa_family
));
428 seq_printf(s
, ",uid=%u",
429 from_kuid_munged(&init_user_ns
, cifs_sb
->mnt_uid
));
430 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_OVERR_UID
)
431 seq_puts(s
, ",forceuid");
433 seq_puts(s
, ",noforceuid");
435 seq_printf(s
, ",gid=%u",
436 from_kgid_munged(&init_user_ns
, cifs_sb
->mnt_gid
));
437 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_OVERR_GID
)
438 seq_puts(s
, ",forcegid");
440 seq_puts(s
, ",noforcegid");
442 cifs_show_address(s
, tcon
->ses
->server
);
445 seq_printf(s
, ",file_mode=0%ho,dir_mode=0%ho",
446 cifs_sb
->mnt_file_mode
,
447 cifs_sb
->mnt_dir_mode
);
449 cifs_show_nls(s
, cifs_sb
->local_nls
);
452 seq_puts(s
, ",seal");
454 seq_puts(s
, ",nocase");
456 seq_puts(s
, ",hard");
457 if (tcon
->use_persistent
)
458 seq_puts(s
, ",persistenthandles");
459 else if (tcon
->use_resilient
)
460 seq_puts(s
, ",resilienthandles");
462 seq_puts(s
, ",unix");
464 seq_puts(s
, ",nounix");
465 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_POSIX_PATHS
)
466 seq_puts(s
, ",posixpaths");
467 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SET_UID
)
468 seq_puts(s
, ",setuids");
469 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
)
470 seq_puts(s
, ",serverino");
471 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_RWPIDFORWARD
)
472 seq_puts(s
, ",rwpidforward");
473 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NOPOSIXBRL
)
474 seq_puts(s
, ",forcemand");
475 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_XATTR
)
476 seq_puts(s
, ",nouser_xattr");
477 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR
)
478 seq_puts(s
, ",mapchars");
479 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MAP_SFM_CHR
)
480 seq_puts(s
, ",mapposix");
481 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_UNX_EMUL
)
483 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_BRL
)
484 seq_puts(s
, ",nobrl");
485 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_ACL
)
486 seq_puts(s
, ",cifsacl");
487 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_DYNPERM
)
488 seq_puts(s
, ",dynperm");
489 if (root
->d_sb
->s_flags
& MS_POSIXACL
)
491 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MF_SYMLINKS
)
492 seq_puts(s
, ",mfsymlinks");
493 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_FSCACHE
)
495 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NOSSYNC
)
496 seq_puts(s
, ",nostrictsync");
497 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_NO_PERM
)
498 seq_puts(s
, ",noperm");
499 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPUID
)
500 seq_printf(s
, ",backupuid=%u",
501 from_kuid_munged(&init_user_ns
,
502 cifs_sb
->mnt_backupuid
));
503 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_BACKUPGID
)
504 seq_printf(s
, ",backupgid=%u",
505 from_kgid_munged(&init_user_ns
,
506 cifs_sb
->mnt_backupgid
));
508 seq_printf(s
, ",rsize=%u", cifs_sb
->rsize
);
509 seq_printf(s
, ",wsize=%u", cifs_sb
->wsize
);
510 seq_printf(s
, ",echo_interval=%lu",
511 tcon
->ses
->server
->echo_interval
/ HZ
);
512 /* convert actimeo and display it in seconds */
513 seq_printf(s
, ",actimeo=%lu", cifs_sb
->actimeo
/ HZ
);
518 static void cifs_umount_begin(struct super_block
*sb
)
520 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
521 struct cifs_tcon
*tcon
;
526 tcon
= cifs_sb_master_tcon(cifs_sb
);
528 spin_lock(&cifs_tcp_ses_lock
);
529 if ((tcon
->tc_count
> 1) || (tcon
->tidStatus
== CifsExiting
)) {
530 /* we have other mounts to same share or we have
531 already tried to force umount this and woken up
532 all waiting network requests, nothing to do */
533 spin_unlock(&cifs_tcp_ses_lock
);
535 } else if (tcon
->tc_count
== 1)
536 tcon
->tidStatus
= CifsExiting
;
537 spin_unlock(&cifs_tcp_ses_lock
);
539 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
540 /* cancel_notify_requests(tcon); */
541 if (tcon
->ses
&& tcon
->ses
->server
) {
542 cifs_dbg(FYI
, "wake up tasks now - umount begin not complete\n");
543 wake_up_all(&tcon
->ses
->server
->request_q
);
544 wake_up_all(&tcon
->ses
->server
->response_q
);
545 msleep(1); /* yield */
546 /* we have to kick the requests once more */
547 wake_up_all(&tcon
->ses
->server
->response_q
);
554 #ifdef CONFIG_CIFS_STATS2
555 static int cifs_show_stats(struct seq_file
*s
, struct dentry
*root
)
562 static int cifs_remount(struct super_block
*sb
, int *flags
, char *data
)
565 *flags
|= MS_NODIRATIME
;
569 static int cifs_drop_inode(struct inode
*inode
)
571 struct cifs_sb_info
*cifs_sb
= CIFS_SB(inode
->i_sb
);
573 /* no serverino => unconditional eviction */
574 return !(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) ||
575 generic_drop_inode(inode
);
578 static const struct super_operations cifs_super_ops
= {
579 .statfs
= cifs_statfs
,
580 .alloc_inode
= cifs_alloc_inode
,
581 .destroy_inode
= cifs_destroy_inode
,
582 .drop_inode
= cifs_drop_inode
,
583 .evict_inode
= cifs_evict_inode
,
584 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
585 function unless later we add lazy close of inodes or unless the
586 kernel forgets to call us with the same number of releases (closes)
588 .show_options
= cifs_show_options
,
589 .umount_begin
= cifs_umount_begin
,
590 .remount_fs
= cifs_remount
,
591 #ifdef CONFIG_CIFS_STATS2
592 .show_stats
= cifs_show_stats
,
597 * Get root dentry from superblock according to prefix path mount option.
598 * Return dentry with refcount + 1 on success and NULL otherwise.
600 static struct dentry
*
601 cifs_get_root(struct smb_vol
*vol
, struct super_block
*sb
)
603 struct dentry
*dentry
;
604 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
605 char *full_path
= NULL
;
609 full_path
= cifs_build_path_to_root(vol
, cifs_sb
,
610 cifs_sb_master_tcon(cifs_sb
));
611 if (full_path
== NULL
)
612 return ERR_PTR(-ENOMEM
);
614 cifs_dbg(FYI
, "Get root dentry for %s\n", full_path
);
616 sep
= CIFS_DIR_SEP(cifs_sb
);
617 dentry
= dget(sb
->s_root
);
621 struct inode
*dir
= d_inode(dentry
);
622 struct dentry
*child
;
626 dentry
= ERR_PTR(-ENOENT
);
629 if (!S_ISDIR(dir
->i_mode
)) {
631 dentry
= ERR_PTR(-ENOTDIR
);
635 /* skip separators */
642 while (*s
&& *s
!= sep
)
646 child
= lookup_one_len(p
, dentry
, s
- p
);
650 } while (!IS_ERR(dentry
));
655 static int cifs_set_super(struct super_block
*sb
, void *data
)
657 struct cifs_mnt_data
*mnt_data
= data
;
658 sb
->s_fs_info
= mnt_data
->cifs_sb
;
659 return set_anon_super(sb
, NULL
);
662 static struct dentry
*
663 cifs_do_mount(struct file_system_type
*fs_type
,
664 int flags
, const char *dev_name
, void *data
)
667 struct super_block
*sb
;
668 struct cifs_sb_info
*cifs_sb
;
669 struct smb_vol
*volume_info
;
670 struct cifs_mnt_data mnt_data
;
673 cifs_dbg(FYI
, "Devname: %s flags: %d\n", dev_name
, flags
);
675 volume_info
= cifs_get_volume_info((char *)data
, dev_name
);
676 if (IS_ERR(volume_info
))
677 return ERR_CAST(volume_info
);
679 cifs_sb
= kzalloc(sizeof(struct cifs_sb_info
), GFP_KERNEL
);
680 if (cifs_sb
== NULL
) {
681 root
= ERR_PTR(-ENOMEM
);
685 cifs_sb
->mountdata
= kstrndup(data
, PAGE_SIZE
, GFP_KERNEL
);
686 if (cifs_sb
->mountdata
== NULL
) {
687 root
= ERR_PTR(-ENOMEM
);
691 cifs_setup_cifs_sb(volume_info
, cifs_sb
);
693 rc
= cifs_mount(cifs_sb
, volume_info
);
695 if (!(flags
& MS_SILENT
))
696 cifs_dbg(VFS
, "cifs_mount failed w/return code = %d\n",
702 mnt_data
.vol
= volume_info
;
703 mnt_data
.cifs_sb
= cifs_sb
;
704 mnt_data
.flags
= flags
;
706 /* BB should we make this contingent on mount parm? */
707 flags
|= MS_NODIRATIME
| MS_NOATIME
;
709 sb
= sget(fs_type
, cifs_match_super
, cifs_set_super
, flags
, &mnt_data
);
712 cifs_umount(cifs_sb
);
717 cifs_dbg(FYI
, "Use existing superblock\n");
718 cifs_umount(cifs_sb
);
720 rc
= cifs_read_super(sb
);
726 sb
->s_flags
|= MS_ACTIVE
;
729 root
= cifs_get_root(volume_info
, sb
);
733 cifs_dbg(FYI
, "dentry root is: %p\n", root
);
737 deactivate_locked_super(sb
);
739 cifs_cleanup_volume_info(volume_info
);
743 kfree(cifs_sb
->mountdata
);
747 unload_nls(volume_info
->local_nls
);
752 cifs_loose_read_iter(struct kiocb
*iocb
, struct iov_iter
*iter
)
755 struct inode
*inode
= file_inode(iocb
->ki_filp
);
757 if (iocb
->ki_filp
->f_flags
& O_DIRECT
)
758 return cifs_user_readv(iocb
, iter
);
760 rc
= cifs_revalidate_mapping(inode
);
764 return generic_file_read_iter(iocb
, iter
);
767 static ssize_t
cifs_file_write_iter(struct kiocb
*iocb
, struct iov_iter
*from
)
769 struct inode
*inode
= file_inode(iocb
->ki_filp
);
770 struct cifsInodeInfo
*cinode
= CIFS_I(inode
);
774 if (iocb
->ki_filp
->f_flags
& O_DIRECT
) {
775 written
= cifs_user_writev(iocb
, from
);
776 if (written
> 0 && CIFS_CACHE_READ(cinode
)) {
777 cifs_zap_mapping(inode
);
779 "Set no oplock for inode=%p after a write operation\n",
786 written
= cifs_get_writer(cinode
);
790 written
= generic_file_write_iter(iocb
, from
);
792 if (CIFS_CACHE_WRITE(CIFS_I(inode
)))
795 rc
= filemap_fdatawrite(inode
->i_mapping
);
797 cifs_dbg(FYI
, "cifs_file_write_iter: %d rc on %p inode\n",
801 cifs_put_writer(cinode
);
805 static loff_t
cifs_llseek(struct file
*file
, loff_t offset
, int whence
)
808 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
809 * the cached file length
811 if (whence
!= SEEK_SET
&& whence
!= SEEK_CUR
) {
813 struct inode
*inode
= file_inode(file
);
816 * We need to be sure that all dirty pages are written and the
817 * server has the newest file length.
819 if (!CIFS_CACHE_READ(CIFS_I(inode
)) && inode
->i_mapping
&&
820 inode
->i_mapping
->nrpages
!= 0) {
821 rc
= filemap_fdatawait(inode
->i_mapping
);
823 mapping_set_error(inode
->i_mapping
, rc
);
828 * Some applications poll for the file length in this strange
829 * way so we must seek to end on non-oplocked files by
830 * setting the revalidate time to zero.
832 CIFS_I(inode
)->time
= 0;
834 rc
= cifs_revalidate_file_attr(file
);
838 return generic_file_llseek(file
, offset
, whence
);
842 cifs_setlease(struct file
*file
, long arg
, struct file_lock
**lease
, void **priv
)
845 * Note that this is called by vfs setlease with i_lock held to
846 * protect *lease from going away.
848 struct inode
*inode
= file_inode(file
);
849 struct cifsFileInfo
*cfile
= file
->private_data
;
851 if (!(S_ISREG(inode
->i_mode
)))
854 /* Check if file is oplocked if this is request for new lease */
855 if (arg
== F_UNLCK
||
856 ((arg
== F_RDLCK
) && CIFS_CACHE_READ(CIFS_I(inode
))) ||
857 ((arg
== F_WRLCK
) && CIFS_CACHE_WRITE(CIFS_I(inode
))))
858 return generic_setlease(file
, arg
, lease
, priv
);
859 else if (tlink_tcon(cfile
->tlink
)->local_lease
&&
860 !CIFS_CACHE_READ(CIFS_I(inode
)))
862 * If the server claims to support oplock on this file, then we
863 * still need to check oplock even if the local_lease mount
864 * option is set, but there are servers which do not support
865 * oplock for which this mount option may be useful if the user
866 * knows that the file won't be changed on the server by anyone
869 return generic_setlease(file
, arg
, lease
, priv
);
874 struct file_system_type cifs_fs_type
= {
875 .owner
= THIS_MODULE
,
877 .mount
= cifs_do_mount
,
878 .kill_sb
= cifs_kill_sb
,
881 MODULE_ALIAS_FS("cifs");
882 const struct inode_operations cifs_dir_inode_ops
= {
883 .create
= cifs_create
,
884 .atomic_open
= cifs_atomic_open
,
885 .lookup
= cifs_lookup
,
886 .getattr
= cifs_getattr
,
887 .unlink
= cifs_unlink
,
888 .link
= cifs_hardlink
,
891 .rename2
= cifs_rename2
,
892 .permission
= cifs_permission
,
893 /* revalidate:cifs_revalidate, */
894 .setattr
= cifs_setattr
,
895 .symlink
= cifs_symlink
,
897 #ifdef CONFIG_CIFS_XATTR
898 .setxattr
= cifs_setxattr
,
899 .getxattr
= cifs_getxattr
,
900 .listxattr
= cifs_listxattr
,
901 .removexattr
= cifs_removexattr
,
905 const struct inode_operations cifs_file_inode_ops
= {
906 /* revalidate:cifs_revalidate, */
907 .setattr
= cifs_setattr
,
908 .getattr
= cifs_getattr
, /* do we need this anymore? */
909 .permission
= cifs_permission
,
910 #ifdef CONFIG_CIFS_XATTR
911 .setxattr
= cifs_setxattr
,
912 .getxattr
= cifs_getxattr
,
913 .listxattr
= cifs_listxattr
,
914 .removexattr
= cifs_removexattr
,
918 const struct inode_operations cifs_symlink_inode_ops
= {
919 .readlink
= generic_readlink
,
920 .get_link
= cifs_get_link
,
921 .permission
= cifs_permission
,
922 /* BB add the following two eventually */
923 /* revalidate: cifs_revalidate,
924 setattr: cifs_notify_change, *//* BB do we need notify change */
925 #ifdef CONFIG_CIFS_XATTR
926 .setxattr
= cifs_setxattr
,
927 .getxattr
= cifs_getxattr
,
928 .listxattr
= cifs_listxattr
,
929 .removexattr
= cifs_removexattr
,
933 static int cifs_clone_file_range(struct file
*src_file
, loff_t off
,
934 struct file
*dst_file
, loff_t destoff
, u64 len
)
936 struct inode
*src_inode
= file_inode(src_file
);
937 struct inode
*target_inode
= file_inode(dst_file
);
938 struct cifsFileInfo
*smb_file_src
= src_file
->private_data
;
939 struct cifsFileInfo
*smb_file_target
= dst_file
->private_data
;
940 struct cifs_tcon
*target_tcon
= tlink_tcon(smb_file_target
->tlink
);
944 cifs_dbg(FYI
, "clone range\n");
948 if (!src_file
->private_data
|| !dst_file
->private_data
) {
950 cifs_dbg(VFS
, "missing cifsFileInfo on copy range src file\n");
955 * Note: cifs case is easier than btrfs since server responsible for
956 * checks for proper open modes and file type and if it wants
957 * server could even support copy of range where source = target
959 lock_two_nondirectories(target_inode
, src_inode
);
962 len
= src_inode
->i_size
- off
;
964 cifs_dbg(FYI
, "about to flush pages\n");
965 /* should we flush first and last page first */
966 truncate_inode_pages_range(&target_inode
->i_data
, destoff
,
967 PAGE_CACHE_ALIGN(destoff
+ len
)-1);
969 if (target_tcon
->ses
->server
->ops
->duplicate_extents
)
970 rc
= target_tcon
->ses
->server
->ops
->duplicate_extents(xid
,
971 smb_file_src
, smb_file_target
, off
, len
, destoff
);
975 /* force revalidate of size and timestamps of target file now
976 that target is updated on the server */
977 CIFS_I(target_inode
)->time
= 0;
978 /* although unlocking in the reverse order from locking is not
979 strictly necessary here it is a little cleaner to be consistent */
980 unlock_two_nondirectories(src_inode
, target_inode
);
986 const struct file_operations cifs_file_ops
= {
987 .read_iter
= cifs_loose_read_iter
,
988 .write_iter
= cifs_file_write_iter
,
990 .release
= cifs_close
,
994 .mmap
= cifs_file_mmap
,
995 .splice_read
= generic_file_splice_read
,
996 .llseek
= cifs_llseek
,
997 .unlocked_ioctl
= cifs_ioctl
,
998 .clone_file_range
= cifs_clone_file_range
,
999 .setlease
= cifs_setlease
,
1000 .fallocate
= cifs_fallocate
,
1003 const struct file_operations cifs_file_strict_ops
= {
1004 .read_iter
= cifs_strict_readv
,
1005 .write_iter
= cifs_strict_writev
,
1007 .release
= cifs_close
,
1009 .fsync
= cifs_strict_fsync
,
1010 .flush
= cifs_flush
,
1011 .mmap
= cifs_file_strict_mmap
,
1012 .splice_read
= generic_file_splice_read
,
1013 .llseek
= cifs_llseek
,
1014 .unlocked_ioctl
= cifs_ioctl
,
1015 .clone_file_range
= cifs_clone_file_range
,
1016 .setlease
= cifs_setlease
,
1017 .fallocate
= cifs_fallocate
,
1020 const struct file_operations cifs_file_direct_ops
= {
1021 /* BB reevaluate whether they can be done with directio, no cache */
1022 .read_iter
= cifs_user_readv
,
1023 .write_iter
= cifs_user_writev
,
1025 .release
= cifs_close
,
1027 .fsync
= cifs_fsync
,
1028 .flush
= cifs_flush
,
1029 .mmap
= cifs_file_mmap
,
1030 .splice_read
= generic_file_splice_read
,
1031 .unlocked_ioctl
= cifs_ioctl
,
1032 .clone_file_range
= cifs_clone_file_range
,
1033 .llseek
= cifs_llseek
,
1034 .setlease
= cifs_setlease
,
1035 .fallocate
= cifs_fallocate
,
1038 const struct file_operations cifs_file_nobrl_ops
= {
1039 .read_iter
= cifs_loose_read_iter
,
1040 .write_iter
= cifs_file_write_iter
,
1042 .release
= cifs_close
,
1043 .fsync
= cifs_fsync
,
1044 .flush
= cifs_flush
,
1045 .mmap
= cifs_file_mmap
,
1046 .splice_read
= generic_file_splice_read
,
1047 .llseek
= cifs_llseek
,
1048 .unlocked_ioctl
= cifs_ioctl
,
1049 .clone_file_range
= cifs_clone_file_range
,
1050 .setlease
= cifs_setlease
,
1051 .fallocate
= cifs_fallocate
,
1054 const struct file_operations cifs_file_strict_nobrl_ops
= {
1055 .read_iter
= cifs_strict_readv
,
1056 .write_iter
= cifs_strict_writev
,
1058 .release
= cifs_close
,
1059 .fsync
= cifs_strict_fsync
,
1060 .flush
= cifs_flush
,
1061 .mmap
= cifs_file_strict_mmap
,
1062 .splice_read
= generic_file_splice_read
,
1063 .llseek
= cifs_llseek
,
1064 .unlocked_ioctl
= cifs_ioctl
,
1065 .clone_file_range
= cifs_clone_file_range
,
1066 .setlease
= cifs_setlease
,
1067 .fallocate
= cifs_fallocate
,
1070 const struct file_operations cifs_file_direct_nobrl_ops
= {
1071 /* BB reevaluate whether they can be done with directio, no cache */
1072 .read_iter
= cifs_user_readv
,
1073 .write_iter
= cifs_user_writev
,
1075 .release
= cifs_close
,
1076 .fsync
= cifs_fsync
,
1077 .flush
= cifs_flush
,
1078 .mmap
= cifs_file_mmap
,
1079 .splice_read
= generic_file_splice_read
,
1080 .unlocked_ioctl
= cifs_ioctl
,
1081 .clone_file_range
= cifs_clone_file_range
,
1082 .llseek
= cifs_llseek
,
1083 .setlease
= cifs_setlease
,
1084 .fallocate
= cifs_fallocate
,
1087 const struct file_operations cifs_dir_ops
= {
1088 .iterate
= cifs_readdir
,
1089 .release
= cifs_closedir
,
1090 .read
= generic_read_dir
,
1091 .unlocked_ioctl
= cifs_ioctl
,
1092 .clone_file_range
= cifs_clone_file_range
,
1093 .llseek
= generic_file_llseek
,
1097 cifs_init_once(void *inode
)
1099 struct cifsInodeInfo
*cifsi
= inode
;
1101 inode_init_once(&cifsi
->vfs_inode
);
1102 init_rwsem(&cifsi
->lock_sem
);
1106 cifs_init_inodecache(void)
1108 cifs_inode_cachep
= kmem_cache_create("cifs_inode_cache",
1109 sizeof(struct cifsInodeInfo
),
1110 0, (SLAB_RECLAIM_ACCOUNT
|
1111 SLAB_MEM_SPREAD
|SLAB_ACCOUNT
),
1113 if (cifs_inode_cachep
== NULL
)
1120 cifs_destroy_inodecache(void)
1123 * Make sure all delayed rcu free inodes are flushed before we
1127 kmem_cache_destroy(cifs_inode_cachep
);
1131 cifs_init_request_bufs(void)
1133 size_t max_hdr_size
= MAX_CIFS_HDR_SIZE
;
1134 #ifdef CONFIG_CIFS_SMB2
1136 * SMB2 maximum header size is bigger than CIFS one - no problems to
1137 * allocate some more bytes for CIFS.
1139 max_hdr_size
= MAX_SMB2_HDR_SIZE
;
1141 if (CIFSMaxBufSize
< 8192) {
1142 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1143 Unicode path name has to fit in any SMB/CIFS path based frames */
1144 CIFSMaxBufSize
= 8192;
1145 } else if (CIFSMaxBufSize
> 1024*127) {
1146 CIFSMaxBufSize
= 1024 * 127;
1148 CIFSMaxBufSize
&= 0x1FE00; /* Round size to even 512 byte mult*/
1151 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1152 CIFSMaxBufSize, CIFSMaxBufSize);
1154 cifs_req_cachep
= kmem_cache_create("cifs_request",
1155 CIFSMaxBufSize
+ max_hdr_size
, 0,
1156 SLAB_HWCACHE_ALIGN
, NULL
);
1157 if (cifs_req_cachep
== NULL
)
1160 if (cifs_min_rcv
< 1)
1162 else if (cifs_min_rcv
> 64) {
1164 cifs_dbg(VFS
, "cifs_min_rcv set to maximum (64)\n");
1167 cifs_req_poolp
= mempool_create_slab_pool(cifs_min_rcv
,
1170 if (cifs_req_poolp
== NULL
) {
1171 kmem_cache_destroy(cifs_req_cachep
);
1174 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1175 almost all handle based requests (but not write response, nor is it
1176 sufficient for path based requests). A smaller size would have
1177 been more efficient (compacting multiple slab items on one 4k page)
1178 for the case in which debug was on, but this larger size allows
1179 more SMBs to use small buffer alloc and is still much more
1180 efficient to alloc 1 per page off the slab compared to 17K (5page)
1181 alloc of large cifs buffers even when page debugging is on */
1182 cifs_sm_req_cachep
= kmem_cache_create("cifs_small_rq",
1183 MAX_CIFS_SMALL_BUFFER_SIZE
, 0, SLAB_HWCACHE_ALIGN
,
1185 if (cifs_sm_req_cachep
== NULL
) {
1186 mempool_destroy(cifs_req_poolp
);
1187 kmem_cache_destroy(cifs_req_cachep
);
1191 if (cifs_min_small
< 2)
1193 else if (cifs_min_small
> 256) {
1194 cifs_min_small
= 256;
1195 cifs_dbg(FYI
, "cifs_min_small set to maximum (256)\n");
1198 cifs_sm_req_poolp
= mempool_create_slab_pool(cifs_min_small
,
1199 cifs_sm_req_cachep
);
1201 if (cifs_sm_req_poolp
== NULL
) {
1202 mempool_destroy(cifs_req_poolp
);
1203 kmem_cache_destroy(cifs_req_cachep
);
1204 kmem_cache_destroy(cifs_sm_req_cachep
);
1212 cifs_destroy_request_bufs(void)
1214 mempool_destroy(cifs_req_poolp
);
1215 kmem_cache_destroy(cifs_req_cachep
);
1216 mempool_destroy(cifs_sm_req_poolp
);
1217 kmem_cache_destroy(cifs_sm_req_cachep
);
1221 cifs_init_mids(void)
1223 cifs_mid_cachep
= kmem_cache_create("cifs_mpx_ids",
1224 sizeof(struct mid_q_entry
), 0,
1225 SLAB_HWCACHE_ALIGN
, NULL
);
1226 if (cifs_mid_cachep
== NULL
)
1229 /* 3 is a reasonable minimum number of simultaneous operations */
1230 cifs_mid_poolp
= mempool_create_slab_pool(3, cifs_mid_cachep
);
1231 if (cifs_mid_poolp
== NULL
) {
1232 kmem_cache_destroy(cifs_mid_cachep
);
1240 cifs_destroy_mids(void)
1242 mempool_destroy(cifs_mid_poolp
);
1243 kmem_cache_destroy(cifs_mid_cachep
);
1251 INIT_LIST_HEAD(&cifs_tcp_ses_list
);
1252 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1253 INIT_LIST_HEAD(&GlobalDnotifyReqList
);
1254 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q
);
1255 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1257 * Initialize Global counters
1259 atomic_set(&sesInfoAllocCount
, 0);
1260 atomic_set(&tconInfoAllocCount
, 0);
1261 atomic_set(&tcpSesAllocCount
, 0);
1262 atomic_set(&tcpSesReconnectCount
, 0);
1263 atomic_set(&tconInfoReconnectCount
, 0);
1265 atomic_set(&bufAllocCount
, 0);
1266 atomic_set(&smBufAllocCount
, 0);
1267 #ifdef CONFIG_CIFS_STATS2
1268 atomic_set(&totBufAllocCount
, 0);
1269 atomic_set(&totSmBufAllocCount
, 0);
1270 #endif /* CONFIG_CIFS_STATS2 */
1272 atomic_set(&midCount
, 0);
1273 GlobalCurrentXid
= 0;
1274 GlobalTotalActiveXid
= 0;
1275 GlobalMaxActiveXid
= 0;
1276 spin_lock_init(&cifs_tcp_ses_lock
);
1277 spin_lock_init(&cifs_file_list_lock
);
1278 spin_lock_init(&GlobalMid_Lock
);
1280 if (cifs_max_pending
< 2) {
1281 cifs_max_pending
= 2;
1282 cifs_dbg(FYI
, "cifs_max_pending set to min of 2\n");
1283 } else if (cifs_max_pending
> CIFS_MAX_REQ
) {
1284 cifs_max_pending
= CIFS_MAX_REQ
;
1285 cifs_dbg(FYI
, "cifs_max_pending set to max of %u\n",
1289 cifsiod_wq
= alloc_workqueue("cifsiod", WQ_FREEZABLE
|WQ_MEM_RECLAIM
, 0);
1292 goto out_clean_proc
;
1295 rc
= cifs_fscache_register();
1297 goto out_destroy_wq
;
1299 rc
= cifs_init_inodecache();
1301 goto out_unreg_fscache
;
1303 rc
= cifs_init_mids();
1305 goto out_destroy_inodecache
;
1307 rc
= cifs_init_request_bufs();
1309 goto out_destroy_mids
;
1311 #ifdef CONFIG_CIFS_UPCALL
1312 rc
= register_key_type(&cifs_spnego_key_type
);
1314 goto out_destroy_request_bufs
;
1315 #endif /* CONFIG_CIFS_UPCALL */
1317 #ifdef CONFIG_CIFS_ACL
1318 rc
= init_cifs_idmap();
1320 goto out_register_key_type
;
1321 #endif /* CONFIG_CIFS_ACL */
1323 rc
= register_filesystem(&cifs_fs_type
);
1325 goto out_init_cifs_idmap
;
1329 out_init_cifs_idmap
:
1330 #ifdef CONFIG_CIFS_ACL
1332 out_register_key_type
:
1334 #ifdef CONFIG_CIFS_UPCALL
1335 unregister_key_type(&cifs_spnego_key_type
);
1336 out_destroy_request_bufs
:
1338 cifs_destroy_request_bufs();
1340 cifs_destroy_mids();
1341 out_destroy_inodecache
:
1342 cifs_destroy_inodecache();
1344 cifs_fscache_unregister();
1346 destroy_workqueue(cifsiod_wq
);
1355 cifs_dbg(NOISY
, "exit_cifs\n");
1356 unregister_filesystem(&cifs_fs_type
);
1357 cifs_dfs_release_automount_timer();
1358 #ifdef CONFIG_CIFS_ACL
1361 #ifdef CONFIG_CIFS_UPCALL
1362 unregister_key_type(&cifs_spnego_key_type
);
1364 cifs_destroy_request_bufs();
1365 cifs_destroy_mids();
1366 cifs_destroy_inodecache();
1367 cifs_fscache_unregister();
1368 destroy_workqueue(cifsiod_wq
);
1372 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1373 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1375 ("VFS to access servers complying with the SNIA CIFS Specification "
1376 "e.g. Samba and Windows");
1377 MODULE_VERSION(CIFS_VERSION
);
1378 module_init(init_cifs
)
1379 module_exit(exit_cifs
)