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>
40 #include <linux/uuid.h>
41 #include <linux/xattr.h>
45 #define DECLARE_GLOBALS_HERE
47 #include "cifsproto.h"
48 #include "cifs_debug.h"
49 #include "cifs_fs_sb.h"
51 #include <linux/key-type.h>
52 #include "cifs_spnego.h"
55 #ifdef CONFIG_CIFS_DFS_UPCALL
56 #include "dfs_cache.h"
61 bool enable_oplocks = true;
62 bool linuxExtEnabled = true;
63 bool lookupCacheEnabled = true;
64 bool disable_legacy_dialects; /* false by default */
65 unsigned int global_secflags = CIFSSEC_DEF;
66 /* unsigned int ntlmv2_support = 0; */
67 unsigned int sign_CIFS_PDUs = 1;
68 static const struct super_operations cifs_super_ops;
69 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
70 module_param(CIFSMaxBufSize, uint, 0444);
71 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) "
73 "Default: 16384 Range: 8192 to 130048");
74 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
75 module_param(cifs_min_rcv, uint, 0444);
76 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
78 unsigned int cifs_min_small = 30;
79 module_param(cifs_min_small, uint, 0444);
80 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
82 unsigned int cifs_max_pending = CIFS_MAX_REQ;
83 module_param(cifs_max_pending, uint, 0444);
84 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
85 "CIFS/SMB1 dialect (N/A for SMB3) "
86 "Default: 32767 Range: 2 to 32767.");
87 #ifdef CONFIG_CIFS_STATS2
88 unsigned int slow_rsp_threshold = 1;
89 module_param(slow_rsp_threshold, uint, 0644);
90 MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait "
91 "before logging that a response is delayed. "
92 "Default: 1 (if set to 0 disables msg).");
95 module_param(enable_oplocks, bool, 0644);
96 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
98 module_param(disable_legacy_dialects, bool, 0644);
99 MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be "
100 "helpful to restrict the ability to "
101 "override the default dialects (SMB2.1, "
102 "SMB3 and SMB3.02) on mount with old "
103 "dialects (CIFS/SMB1 and SMB2) since "
104 "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker"
105 " and less secure. Default: n/N/0");
107 extern mempool_t *cifs_sm_req_poolp;
108 extern mempool_t *cifs_req_poolp;
109 extern mempool_t *cifs_mid_poolp;
111 struct workqueue_struct *cifsiod_wq;
112 struct workqueue_struct *decrypt_wq;
113 struct workqueue_struct *cifsoplockd_wq;
114 __u32 cifs_lock_secret;
117 * Bumps refcount for cifs super block.
118 * Note that it should be only called if a referece to VFS super block is
119 * already held, e.g. in open-type syscalls context. Otherwise it can race with
120 * atomic_dec_and_test in deactivate_locked_super.
123 cifs_sb_active(struct super_block *sb)
125 struct cifs_sb_info *server = CIFS_SB(sb);
127 if (atomic_inc_return(&server->active) == 1)
128 atomic_inc(&sb->s_active);
132 cifs_sb_deactive(struct super_block *sb)
134 struct cifs_sb_info *server = CIFS_SB(sb);
136 if (atomic_dec_and_test(&server->active))
137 deactivate_super(sb);
141 cifs_read_super(struct super_block *sb)
144 struct cifs_sb_info *cifs_sb;
145 struct cifs_tcon *tcon;
148 cifs_sb = CIFS_SB(sb);
149 tcon = cifs_sb_master_tcon(cifs_sb);
151 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
152 sb->s_flags |= SB_POSIXACL;
154 if (tcon->snapshot_time)
155 sb->s_flags |= SB_RDONLY;
157 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
158 sb->s_maxbytes = MAX_LFS_FILESIZE;
160 sb->s_maxbytes = MAX_NON_LFS;
162 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
163 sb->s_time_gran = 100;
165 sb->s_magic = CIFS_MAGIC_NUMBER;
166 sb->s_op = &cifs_super_ops;
167 sb->s_xattr = cifs_xattr_handlers;
168 rc = super_setup_bdi(sb);
171 /* tune readahead according to rsize */
172 sb->s_bdi->ra_pages = cifs_sb->rsize / PAGE_SIZE;
174 sb->s_blocksize = CIFS_MAX_MSGSIZE;
175 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
176 inode = cifs_root_iget(sb);
184 sb->s_d_op = &cifs_ci_dentry_ops;
186 sb->s_d_op = &cifs_dentry_ops;
188 sb->s_root = d_make_root(inode);
194 #ifdef CONFIG_CIFS_NFSD_EXPORT
195 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
196 cifs_dbg(FYI, "export ops supported\n");
197 sb->s_export_op = &cifs_export_ops;
199 #endif /* CONFIG_CIFS_NFSD_EXPORT */
204 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
208 static void cifs_kill_sb(struct super_block *sb)
210 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
212 cifs_umount(cifs_sb);
216 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
218 struct super_block *sb = dentry->d_sb;
219 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
220 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
221 struct TCP_Server_Info *server = tcon->ses->server;
227 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
229 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
231 buf->f_namelen = PATH_MAX;
233 buf->f_fsid.val[0] = tcon->vol_serial_number;
234 /* are using part of create time for more randomness, see man statfs */
235 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
237 buf->f_files = 0; /* undefined */
238 buf->f_ffree = 0; /* unlimited */
240 if (server->ops->queryfs)
241 rc = server->ops->queryfs(xid, tcon, buf);
247 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
249 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
250 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
251 struct TCP_Server_Info *server = tcon->ses->server;
253 if (server->ops->fallocate)
254 return server->ops->fallocate(file, tcon, mode, off, len);
259 static int cifs_permission(struct inode *inode, int mask)
261 struct cifs_sb_info *cifs_sb;
263 cifs_sb = CIFS_SB(inode->i_sb);
265 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
266 if ((mask & MAY_EXEC) && !execute_ok(inode))
270 } else /* file mode might have been restricted at mount time
271 on the client (above and beyond ACL on servers) for
272 servers which do not support setting and viewing mode bits,
273 so allowing client to check permissions is useful */
274 return generic_permission(inode, mask);
277 static struct kmem_cache *cifs_inode_cachep;
278 static struct kmem_cache *cifs_req_cachep;
279 static struct kmem_cache *cifs_mid_cachep;
280 static struct kmem_cache *cifs_sm_req_cachep;
281 mempool_t *cifs_sm_req_poolp;
282 mempool_t *cifs_req_poolp;
283 mempool_t *cifs_mid_poolp;
285 static struct inode *
286 cifs_alloc_inode(struct super_block *sb)
288 struct cifsInodeInfo *cifs_inode;
289 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
292 cifs_inode->cifsAttrs = 0x20; /* default */
293 cifs_inode->time = 0;
295 * Until the file is open and we have gotten oplock info back from the
296 * server, can not assume caching of file data or metadata.
298 cifs_set_oplock_level(cifs_inode, 0);
299 cifs_inode->flags = 0;
300 spin_lock_init(&cifs_inode->writers_lock);
301 cifs_inode->writers = 0;
302 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
303 cifs_inode->server_eof = 0;
304 cifs_inode->uniqueid = 0;
305 cifs_inode->createtime = 0;
306 cifs_inode->epoch = 0;
307 spin_lock_init(&cifs_inode->open_file_lock);
308 generate_random_uuid(cifs_inode->lease_key);
311 * Can not set i_flags here - they get immediately overwritten to zero
314 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
315 INIT_LIST_HEAD(&cifs_inode->openFileList);
316 INIT_LIST_HEAD(&cifs_inode->llist);
317 return &cifs_inode->vfs_inode;
321 cifs_free_inode(struct inode *inode)
323 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
327 cifs_evict_inode(struct inode *inode)
329 truncate_inode_pages_final(&inode->i_data);
331 cifs_fscache_release_inode_cookie(inode);
335 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
337 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
338 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
340 seq_puts(s, ",addr=");
342 switch (server->dstaddr.ss_family) {
344 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
347 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
348 if (sa6->sin6_scope_id)
349 seq_printf(s, "%%%u", sa6->sin6_scope_id);
352 seq_puts(s, "(unknown)");
355 seq_puts(s, ",rdma");
359 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
361 if (ses->sectype == Unspecified) {
362 if (ses->user_name == NULL)
363 seq_puts(s, ",sec=none");
367 seq_puts(s, ",sec=");
369 switch (ses->sectype) {
371 seq_puts(s, "lanman");
374 seq_puts(s, "ntlmv2");
380 seq_printf(s, "krb5,cruid=%u", from_kuid_munged(&init_user_ns,ses->cred_uid));
383 seq_puts(s, "ntlmssp");
386 /* shouldn't ever happen */
387 seq_puts(s, "unknown");
396 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
398 seq_puts(s, ",cache=");
400 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
401 seq_puts(s, "strict");
402 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
404 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
405 seq_puts(s, "singleclient"); /* assume only one client access */
406 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)
407 seq_puts(s, "ro"); /* read only caching assumed */
409 seq_puts(s, "loose");
413 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
415 struct nls_table *def;
417 /* Display iocharset= option if it's not default charset */
418 def = load_nls_default();
420 seq_printf(s, ",iocharset=%s", cur->charset);
425 * cifs_show_options() is for displaying mount options in /proc/mounts.
426 * Not all settable options are displayed but most of the important
430 cifs_show_options(struct seq_file *s, struct dentry *root)
432 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
433 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
434 struct sockaddr *srcaddr;
435 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
437 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
438 cifs_show_security(s, tcon->ses);
439 cifs_show_cache_flavor(s, cifs_sb);
442 seq_puts(s, ",nolease");
443 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
444 seq_puts(s, ",multiuser");
445 else if (tcon->ses->user_name)
446 seq_show_option(s, "username", tcon->ses->user_name);
448 if (tcon->ses->domainName && tcon->ses->domainName[0] != 0)
449 seq_show_option(s, "domain", tcon->ses->domainName);
451 if (srcaddr->sa_family != AF_UNSPEC) {
452 struct sockaddr_in *saddr4;
453 struct sockaddr_in6 *saddr6;
454 saddr4 = (struct sockaddr_in *)srcaddr;
455 saddr6 = (struct sockaddr_in6 *)srcaddr;
456 if (srcaddr->sa_family == AF_INET6)
457 seq_printf(s, ",srcaddr=%pI6c",
459 else if (srcaddr->sa_family == AF_INET)
460 seq_printf(s, ",srcaddr=%pI4",
461 &saddr4->sin_addr.s_addr);
463 seq_printf(s, ",srcaddr=BAD-AF:%i",
464 (int)(srcaddr->sa_family));
467 seq_printf(s, ",uid=%u",
468 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
469 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
470 seq_puts(s, ",forceuid");
472 seq_puts(s, ",noforceuid");
474 seq_printf(s, ",gid=%u",
475 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
476 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
477 seq_puts(s, ",forcegid");
479 seq_puts(s, ",noforcegid");
481 cifs_show_address(s, tcon->ses->server);
484 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
485 cifs_sb->mnt_file_mode,
486 cifs_sb->mnt_dir_mode);
488 cifs_show_nls(s, cifs_sb->local_nls);
491 seq_puts(s, ",seal");
493 seq_puts(s, ",nocase");
494 if (tcon->local_lease)
495 seq_puts(s, ",locallease");
497 seq_puts(s, ",hard");
499 seq_puts(s, ",soft");
500 if (tcon->use_persistent)
501 seq_puts(s, ",persistenthandles");
502 else if (tcon->use_resilient)
503 seq_puts(s, ",resilienthandles");
504 if (tcon->posix_extensions)
505 seq_puts(s, ",posix");
506 else if (tcon->unix_ext)
507 seq_puts(s, ",unix");
509 seq_puts(s, ",nounix");
510 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
511 seq_puts(s, ",nodfs");
512 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
513 seq_puts(s, ",posixpaths");
514 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
515 seq_puts(s, ",setuids");
516 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
517 seq_puts(s, ",idsfromsid");
518 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
519 seq_puts(s, ",serverino");
520 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
521 seq_puts(s, ",rwpidforward");
522 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
523 seq_puts(s, ",forcemand");
524 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
525 seq_puts(s, ",nouser_xattr");
526 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
527 seq_puts(s, ",mapchars");
528 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
529 seq_puts(s, ",mapposix");
530 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
532 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
533 seq_puts(s, ",nobrl");
534 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE)
535 seq_puts(s, ",nohandlecache");
536 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)
537 seq_puts(s, ",modefromsid");
538 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
539 seq_puts(s, ",cifsacl");
540 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
541 seq_puts(s, ",dynperm");
542 if (root->d_sb->s_flags & SB_POSIXACL)
544 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
545 seq_puts(s, ",mfsymlinks");
546 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
548 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
549 seq_puts(s, ",nostrictsync");
550 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
551 seq_puts(s, ",noperm");
552 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
553 seq_printf(s, ",backupuid=%u",
554 from_kuid_munged(&init_user_ns,
555 cifs_sb->mnt_backupuid));
556 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
557 seq_printf(s, ",backupgid=%u",
558 from_kgid_munged(&init_user_ns,
559 cifs_sb->mnt_backupgid));
561 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
562 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
563 seq_printf(s, ",bsize=%u", cifs_sb->bsize);
564 if (tcon->ses->server->min_offload)
565 seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
566 seq_printf(s, ",echo_interval=%lu",
567 tcon->ses->server->echo_interval / HZ);
569 /* Only display max_credits if it was overridden on mount */
570 if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE)
571 seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits);
573 if (tcon->snapshot_time)
574 seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
575 if (tcon->handle_timeout)
576 seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
577 /* convert actimeo and display it in seconds */
578 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
583 static void cifs_umount_begin(struct super_block *sb)
585 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
586 struct cifs_tcon *tcon;
591 tcon = cifs_sb_master_tcon(cifs_sb);
593 spin_lock(&cifs_tcp_ses_lock);
594 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
595 /* we have other mounts to same share or we have
596 already tried to force umount this and woken up
597 all waiting network requests, nothing to do */
598 spin_unlock(&cifs_tcp_ses_lock);
600 } else if (tcon->tc_count == 1)
601 tcon->tidStatus = CifsExiting;
602 spin_unlock(&cifs_tcp_ses_lock);
604 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
605 /* cancel_notify_requests(tcon); */
606 if (tcon->ses && tcon->ses->server) {
607 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
608 wake_up_all(&tcon->ses->server->request_q);
609 wake_up_all(&tcon->ses->server->response_q);
610 msleep(1); /* yield */
611 /* we have to kick the requests once more */
612 wake_up_all(&tcon->ses->server->response_q);
619 #ifdef CONFIG_CIFS_STATS2
620 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
627 static int cifs_remount(struct super_block *sb, int *flags, char *data)
630 *flags |= SB_NODIRATIME;
634 static int cifs_drop_inode(struct inode *inode)
636 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
638 /* no serverino => unconditional eviction */
639 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
640 generic_drop_inode(inode);
643 static const struct super_operations cifs_super_ops = {
644 .statfs = cifs_statfs,
645 .alloc_inode = cifs_alloc_inode,
646 .free_inode = cifs_free_inode,
647 .drop_inode = cifs_drop_inode,
648 .evict_inode = cifs_evict_inode,
649 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
650 function unless later we add lazy close of inodes or unless the
651 kernel forgets to call us with the same number of releases (closes)
653 .show_options = cifs_show_options,
654 .umount_begin = cifs_umount_begin,
655 .remount_fs = cifs_remount,
656 #ifdef CONFIG_CIFS_STATS2
657 .show_stats = cifs_show_stats,
662 * Get root dentry from superblock according to prefix path mount option.
663 * Return dentry with refcount + 1 on success and NULL otherwise.
665 static struct dentry *
666 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
668 struct dentry *dentry;
669 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
670 char *full_path = NULL;
674 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
675 return dget(sb->s_root);
677 full_path = cifs_build_path_to_root(vol, cifs_sb,
678 cifs_sb_master_tcon(cifs_sb), 0);
679 if (full_path == NULL)
680 return ERR_PTR(-ENOMEM);
682 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
684 sep = CIFS_DIR_SEP(cifs_sb);
685 dentry = dget(sb->s_root);
689 struct inode *dir = d_inode(dentry);
690 struct dentry *child;
694 dentry = ERR_PTR(-ENOENT);
697 if (!S_ISDIR(dir->i_mode)) {
699 dentry = ERR_PTR(-ENOTDIR);
703 /* skip separators */
710 while (*s && *s != sep)
713 child = lookup_one_len_unlocked(p, dentry, s - p);
716 } while (!IS_ERR(dentry));
721 static int cifs_set_super(struct super_block *sb, void *data)
723 struct cifs_mnt_data *mnt_data = data;
724 sb->s_fs_info = mnt_data->cifs_sb;
725 return set_anon_super(sb, NULL);
728 static struct dentry *
729 cifs_smb3_do_mount(struct file_system_type *fs_type,
730 int flags, const char *dev_name, void *data, bool is_smb3)
733 struct super_block *sb;
734 struct cifs_sb_info *cifs_sb;
735 struct smb_vol *volume_info;
736 struct cifs_mnt_data mnt_data;
740 * Prints in Kernel / CIFS log the attempted mount operation
741 * If CIFS_DEBUG && cifs_FYI
744 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
746 cifs_info("Attempting to mount %s\n", dev_name);
748 volume_info = cifs_get_volume_info((char *)data, dev_name, is_smb3);
749 if (IS_ERR(volume_info))
750 return ERR_CAST(volume_info);
752 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
753 if (cifs_sb == NULL) {
754 root = ERR_PTR(-ENOMEM);
758 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
759 if (cifs_sb->mountdata == NULL) {
760 root = ERR_PTR(-ENOMEM);
764 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
770 rc = cifs_mount(cifs_sb, volume_info);
772 if (!(flags & SB_SILENT))
773 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
779 mnt_data.vol = volume_info;
780 mnt_data.cifs_sb = cifs_sb;
781 mnt_data.flags = flags;
783 /* BB should we make this contingent on mount parm? */
784 flags |= SB_NODIRATIME | SB_NOATIME;
786 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
789 cifs_umount(cifs_sb);
794 cifs_dbg(FYI, "Use existing superblock\n");
795 cifs_umount(cifs_sb);
797 rc = cifs_read_super(sb);
803 sb->s_flags |= SB_ACTIVE;
806 root = cifs_get_root(volume_info, sb);
810 cifs_dbg(FYI, "dentry root is: %p\n", root);
814 deactivate_locked_super(sb);
816 cifs_cleanup_volume_info(volume_info);
820 kfree(cifs_sb->prepath);
821 kfree(cifs_sb->mountdata);
824 unload_nls(volume_info->local_nls);
828 static struct dentry *
829 smb3_do_mount(struct file_system_type *fs_type,
830 int flags, const char *dev_name, void *data)
832 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, true);
835 static struct dentry *
836 cifs_do_mount(struct file_system_type *fs_type,
837 int flags, const char *dev_name, void *data)
839 return cifs_smb3_do_mount(fs_type, flags, dev_name, data, false);
843 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
846 struct inode *inode = file_inode(iocb->ki_filp);
848 if (iocb->ki_filp->f_flags & O_DIRECT)
849 return cifs_user_readv(iocb, iter);
851 rc = cifs_revalidate_mapping(inode);
855 return generic_file_read_iter(iocb, iter);
858 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
860 struct inode *inode = file_inode(iocb->ki_filp);
861 struct cifsInodeInfo *cinode = CIFS_I(inode);
865 if (iocb->ki_filp->f_flags & O_DIRECT) {
866 written = cifs_user_writev(iocb, from);
867 if (written > 0 && CIFS_CACHE_READ(cinode)) {
868 cifs_zap_mapping(inode);
870 "Set no oplock for inode=%p after a write operation\n",
877 written = cifs_get_writer(cinode);
881 written = generic_file_write_iter(iocb, from);
883 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
886 rc = filemap_fdatawrite(inode->i_mapping);
888 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
892 cifs_put_writer(cinode);
896 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
898 struct cifsFileInfo *cfile = file->private_data;
899 struct cifs_tcon *tcon;
902 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
903 * the cached file length
905 if (whence != SEEK_SET && whence != SEEK_CUR) {
907 struct inode *inode = file_inode(file);
910 * We need to be sure that all dirty pages are written and the
911 * server has the newest file length.
913 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
914 inode->i_mapping->nrpages != 0) {
915 rc = filemap_fdatawait(inode->i_mapping);
917 mapping_set_error(inode->i_mapping, rc);
922 * Some applications poll for the file length in this strange
923 * way so we must seek to end on non-oplocked files by
924 * setting the revalidate time to zero.
926 CIFS_I(inode)->time = 0;
928 rc = cifs_revalidate_file_attr(file);
932 if (cfile && cfile->tlink) {
933 tcon = tlink_tcon(cfile->tlink);
934 if (tcon->ses->server->ops->llseek)
935 return tcon->ses->server->ops->llseek(file, tcon,
938 return generic_file_llseek(file, offset, whence);
942 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
945 * Note that this is called by vfs setlease with i_lock held to
946 * protect *lease from going away.
948 struct inode *inode = file_inode(file);
949 struct cifsFileInfo *cfile = file->private_data;
951 if (!(S_ISREG(inode->i_mode)))
954 /* Check if file is oplocked if this is request for new lease */
955 if (arg == F_UNLCK ||
956 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
957 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
958 return generic_setlease(file, arg, lease, priv);
959 else if (tlink_tcon(cfile->tlink)->local_lease &&
960 !CIFS_CACHE_READ(CIFS_I(inode)))
962 * If the server claims to support oplock on this file, then we
963 * still need to check oplock even if the local_lease mount
964 * option is set, but there are servers which do not support
965 * oplock for which this mount option may be useful if the user
966 * knows that the file won't be changed on the server by anyone
969 return generic_setlease(file, arg, lease, priv);
974 struct file_system_type cifs_fs_type = {
975 .owner = THIS_MODULE,
977 .mount = cifs_do_mount,
978 .kill_sb = cifs_kill_sb,
981 MODULE_ALIAS_FS("cifs");
983 static struct file_system_type smb3_fs_type = {
984 .owner = THIS_MODULE,
986 .mount = smb3_do_mount,
987 .kill_sb = cifs_kill_sb,
990 MODULE_ALIAS_FS("smb3");
991 MODULE_ALIAS("smb3");
993 const struct inode_operations cifs_dir_inode_ops = {
994 .create = cifs_create,
995 .atomic_open = cifs_atomic_open,
996 .lookup = cifs_lookup,
997 .getattr = cifs_getattr,
998 .unlink = cifs_unlink,
999 .link = cifs_hardlink,
1000 .mkdir = cifs_mkdir,
1001 .rmdir = cifs_rmdir,
1002 .rename = cifs_rename2,
1003 .permission = cifs_permission,
1004 .setattr = cifs_setattr,
1005 .symlink = cifs_symlink,
1006 .mknod = cifs_mknod,
1007 .listxattr = cifs_listxattr,
1010 const struct inode_operations cifs_file_inode_ops = {
1011 .setattr = cifs_setattr,
1012 .getattr = cifs_getattr,
1013 .permission = cifs_permission,
1014 .listxattr = cifs_listxattr,
1015 .fiemap = cifs_fiemap,
1018 const struct inode_operations cifs_symlink_inode_ops = {
1019 .get_link = cifs_get_link,
1020 .permission = cifs_permission,
1021 .listxattr = cifs_listxattr,
1024 static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
1025 struct file *dst_file, loff_t destoff, loff_t len,
1026 unsigned int remap_flags)
1028 struct inode *src_inode = file_inode(src_file);
1029 struct inode *target_inode = file_inode(dst_file);
1030 struct cifsFileInfo *smb_file_src = src_file->private_data;
1031 struct cifsFileInfo *smb_file_target;
1032 struct cifs_tcon *target_tcon;
1036 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1039 cifs_dbg(FYI, "clone range\n");
1043 if (!src_file->private_data || !dst_file->private_data) {
1045 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1049 smb_file_target = dst_file->private_data;
1050 target_tcon = tlink_tcon(smb_file_target->tlink);
1053 * Note: cifs case is easier than btrfs since server responsible for
1054 * checks for proper open modes and file type and if it wants
1055 * server could even support copy of range where source = target
1057 lock_two_nondirectories(target_inode, src_inode);
1060 len = src_inode->i_size - off;
1062 cifs_dbg(FYI, "about to flush pages\n");
1063 /* should we flush first and last page first */
1064 truncate_inode_pages_range(&target_inode->i_data, destoff,
1065 PAGE_ALIGN(destoff + len)-1);
1067 if (target_tcon->ses->server->ops->duplicate_extents)
1068 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
1069 smb_file_src, smb_file_target, off, len, destoff);
1073 /* force revalidate of size and timestamps of target file now
1074 that target is updated on the server */
1075 CIFS_I(target_inode)->time = 0;
1076 /* although unlocking in the reverse order from locking is not
1077 strictly necessary here it is a little cleaner to be consistent */
1078 unlock_two_nondirectories(src_inode, target_inode);
1081 return rc < 0 ? rc : len;
1084 ssize_t cifs_file_copychunk_range(unsigned int xid,
1085 struct file *src_file, loff_t off,
1086 struct file *dst_file, loff_t destoff,
1087 size_t len, unsigned int flags)
1089 struct inode *src_inode = file_inode(src_file);
1090 struct inode *target_inode = file_inode(dst_file);
1091 struct cifsFileInfo *smb_file_src;
1092 struct cifsFileInfo *smb_file_target;
1093 struct cifs_tcon *src_tcon;
1094 struct cifs_tcon *target_tcon;
1097 cifs_dbg(FYI, "copychunk range\n");
1099 if (!src_file->private_data || !dst_file->private_data) {
1101 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1106 smb_file_target = dst_file->private_data;
1107 smb_file_src = src_file->private_data;
1108 src_tcon = tlink_tcon(smb_file_src->tlink);
1109 target_tcon = tlink_tcon(smb_file_target->tlink);
1111 if (src_tcon->ses != target_tcon->ses) {
1112 cifs_dbg(VFS, "source and target of copy not on same server\n");
1117 if (!target_tcon->ses->server->ops->copychunk_range)
1121 * Note: cifs case is easier than btrfs since server responsible for
1122 * checks for proper open modes and file type and if it wants
1123 * server could even support copy of range where source = target
1125 lock_two_nondirectories(target_inode, src_inode);
1127 cifs_dbg(FYI, "about to flush pages\n");
1128 /* should we flush first and last page first */
1129 truncate_inode_pages(&target_inode->i_data, 0);
1131 rc = file_modified(dst_file);
1133 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1134 smb_file_src, smb_file_target, off, len, destoff);
1136 file_accessed(src_file);
1138 /* force revalidate of size and timestamps of target file now
1139 * that target is updated on the server
1141 CIFS_I(target_inode)->time = 0;
1142 /* although unlocking in the reverse order from locking is not
1143 * strictly necessary here it is a little cleaner to be consistent
1145 unlock_two_nondirectories(src_inode, target_inode);
1152 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1153 * is a dummy operation.
1155 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1157 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1163 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1164 struct file *dst_file, loff_t destoff,
1165 size_t len, unsigned int flags)
1167 unsigned int xid = get_xid();
1170 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1174 if (rc == -EOPNOTSUPP || rc == -EXDEV)
1175 rc = generic_copy_file_range(src_file, off, dst_file,
1176 destoff, len, flags);
1180 const struct file_operations cifs_file_ops = {
1181 .read_iter = cifs_loose_read_iter,
1182 .write_iter = cifs_file_write_iter,
1184 .release = cifs_close,
1186 .fsync = cifs_fsync,
1187 .flush = cifs_flush,
1188 .mmap = cifs_file_mmap,
1189 .splice_read = generic_file_splice_read,
1190 .splice_write = iter_file_splice_write,
1191 .llseek = cifs_llseek,
1192 .unlocked_ioctl = cifs_ioctl,
1193 .copy_file_range = cifs_copy_file_range,
1194 .remap_file_range = cifs_remap_file_range,
1195 .setlease = cifs_setlease,
1196 .fallocate = cifs_fallocate,
1199 const struct file_operations cifs_file_strict_ops = {
1200 .read_iter = cifs_strict_readv,
1201 .write_iter = cifs_strict_writev,
1203 .release = cifs_close,
1205 .fsync = cifs_strict_fsync,
1206 .flush = cifs_flush,
1207 .mmap = cifs_file_strict_mmap,
1208 .splice_read = generic_file_splice_read,
1209 .splice_write = iter_file_splice_write,
1210 .llseek = cifs_llseek,
1211 .unlocked_ioctl = cifs_ioctl,
1212 .copy_file_range = cifs_copy_file_range,
1213 .remap_file_range = cifs_remap_file_range,
1214 .setlease = cifs_setlease,
1215 .fallocate = cifs_fallocate,
1218 const struct file_operations cifs_file_direct_ops = {
1219 .read_iter = cifs_direct_readv,
1220 .write_iter = cifs_direct_writev,
1222 .release = cifs_close,
1224 .fsync = cifs_fsync,
1225 .flush = cifs_flush,
1226 .mmap = cifs_file_mmap,
1227 .splice_read = generic_file_splice_read,
1228 .splice_write = iter_file_splice_write,
1229 .unlocked_ioctl = cifs_ioctl,
1230 .copy_file_range = cifs_copy_file_range,
1231 .remap_file_range = cifs_remap_file_range,
1232 .llseek = cifs_llseek,
1233 .setlease = cifs_setlease,
1234 .fallocate = cifs_fallocate,
1237 const struct file_operations cifs_file_nobrl_ops = {
1238 .read_iter = cifs_loose_read_iter,
1239 .write_iter = cifs_file_write_iter,
1241 .release = cifs_close,
1242 .fsync = cifs_fsync,
1243 .flush = cifs_flush,
1244 .mmap = cifs_file_mmap,
1245 .splice_read = generic_file_splice_read,
1246 .splice_write = iter_file_splice_write,
1247 .llseek = cifs_llseek,
1248 .unlocked_ioctl = cifs_ioctl,
1249 .copy_file_range = cifs_copy_file_range,
1250 .remap_file_range = cifs_remap_file_range,
1251 .setlease = cifs_setlease,
1252 .fallocate = cifs_fallocate,
1255 const struct file_operations cifs_file_strict_nobrl_ops = {
1256 .read_iter = cifs_strict_readv,
1257 .write_iter = cifs_strict_writev,
1259 .release = cifs_close,
1260 .fsync = cifs_strict_fsync,
1261 .flush = cifs_flush,
1262 .mmap = cifs_file_strict_mmap,
1263 .splice_read = generic_file_splice_read,
1264 .splice_write = iter_file_splice_write,
1265 .llseek = cifs_llseek,
1266 .unlocked_ioctl = cifs_ioctl,
1267 .copy_file_range = cifs_copy_file_range,
1268 .remap_file_range = cifs_remap_file_range,
1269 .setlease = cifs_setlease,
1270 .fallocate = cifs_fallocate,
1273 const struct file_operations cifs_file_direct_nobrl_ops = {
1274 .read_iter = cifs_direct_readv,
1275 .write_iter = cifs_direct_writev,
1277 .release = cifs_close,
1278 .fsync = cifs_fsync,
1279 .flush = cifs_flush,
1280 .mmap = cifs_file_mmap,
1281 .splice_read = generic_file_splice_read,
1282 .splice_write = iter_file_splice_write,
1283 .unlocked_ioctl = cifs_ioctl,
1284 .copy_file_range = cifs_copy_file_range,
1285 .remap_file_range = cifs_remap_file_range,
1286 .llseek = cifs_llseek,
1287 .setlease = cifs_setlease,
1288 .fallocate = cifs_fallocate,
1291 const struct file_operations cifs_dir_ops = {
1292 .iterate_shared = cifs_readdir,
1293 .release = cifs_closedir,
1294 .read = generic_read_dir,
1295 .unlocked_ioctl = cifs_ioctl,
1296 .copy_file_range = cifs_copy_file_range,
1297 .remap_file_range = cifs_remap_file_range,
1298 .llseek = generic_file_llseek,
1299 .fsync = cifs_dir_fsync,
1303 cifs_init_once(void *inode)
1305 struct cifsInodeInfo *cifsi = inode;
1307 inode_init_once(&cifsi->vfs_inode);
1308 init_rwsem(&cifsi->lock_sem);
1312 cifs_init_inodecache(void)
1314 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1315 sizeof(struct cifsInodeInfo),
1316 0, (SLAB_RECLAIM_ACCOUNT|
1317 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1319 if (cifs_inode_cachep == NULL)
1326 cifs_destroy_inodecache(void)
1329 * Make sure all delayed rcu free inodes are flushed before we
1333 kmem_cache_destroy(cifs_inode_cachep);
1337 cifs_init_request_bufs(void)
1340 * SMB2 maximum header size is bigger than CIFS one - no problems to
1341 * allocate some more bytes for CIFS.
1343 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1345 if (CIFSMaxBufSize < 8192) {
1346 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1347 Unicode path name has to fit in any SMB/CIFS path based frames */
1348 CIFSMaxBufSize = 8192;
1349 } else if (CIFSMaxBufSize > 1024*127) {
1350 CIFSMaxBufSize = 1024 * 127;
1352 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1355 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1356 CIFSMaxBufSize, CIFSMaxBufSize);
1358 cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
1359 CIFSMaxBufSize + max_hdr_size, 0,
1360 SLAB_HWCACHE_ALIGN, 0,
1361 CIFSMaxBufSize + max_hdr_size,
1363 if (cifs_req_cachep == NULL)
1366 if (cifs_min_rcv < 1)
1368 else if (cifs_min_rcv > 64) {
1370 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1373 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1376 if (cifs_req_poolp == NULL) {
1377 kmem_cache_destroy(cifs_req_cachep);
1380 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1381 almost all handle based requests (but not write response, nor is it
1382 sufficient for path based requests). A smaller size would have
1383 been more efficient (compacting multiple slab items on one 4k page)
1384 for the case in which debug was on, but this larger size allows
1385 more SMBs to use small buffer alloc and is still much more
1386 efficient to alloc 1 per page off the slab compared to 17K (5page)
1387 alloc of large cifs buffers even when page debugging is on */
1388 cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
1389 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1390 0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
1391 if (cifs_sm_req_cachep == NULL) {
1392 mempool_destroy(cifs_req_poolp);
1393 kmem_cache_destroy(cifs_req_cachep);
1397 if (cifs_min_small < 2)
1399 else if (cifs_min_small > 256) {
1400 cifs_min_small = 256;
1401 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1404 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1405 cifs_sm_req_cachep);
1407 if (cifs_sm_req_poolp == NULL) {
1408 mempool_destroy(cifs_req_poolp);
1409 kmem_cache_destroy(cifs_req_cachep);
1410 kmem_cache_destroy(cifs_sm_req_cachep);
1418 cifs_destroy_request_bufs(void)
1420 mempool_destroy(cifs_req_poolp);
1421 kmem_cache_destroy(cifs_req_cachep);
1422 mempool_destroy(cifs_sm_req_poolp);
1423 kmem_cache_destroy(cifs_sm_req_cachep);
1427 cifs_init_mids(void)
1429 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1430 sizeof(struct mid_q_entry), 0,
1431 SLAB_HWCACHE_ALIGN, NULL);
1432 if (cifs_mid_cachep == NULL)
1435 /* 3 is a reasonable minimum number of simultaneous operations */
1436 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1437 if (cifs_mid_poolp == NULL) {
1438 kmem_cache_destroy(cifs_mid_cachep);
1446 cifs_destroy_mids(void)
1448 mempool_destroy(cifs_mid_poolp);
1449 kmem_cache_destroy(cifs_mid_cachep);
1457 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1458 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1459 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1460 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1461 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1463 * Initialize Global counters
1465 atomic_set(&sesInfoAllocCount, 0);
1466 atomic_set(&tconInfoAllocCount, 0);
1467 atomic_set(&tcpSesAllocCount, 0);
1468 atomic_set(&tcpSesReconnectCount, 0);
1469 atomic_set(&tconInfoReconnectCount, 0);
1471 atomic_set(&bufAllocCount, 0);
1472 atomic_set(&smBufAllocCount, 0);
1473 #ifdef CONFIG_CIFS_STATS2
1474 atomic_set(&totBufAllocCount, 0);
1475 atomic_set(&totSmBufAllocCount, 0);
1476 if (slow_rsp_threshold < 1)
1477 cifs_dbg(FYI, "slow_response_threshold msgs disabled\n");
1478 else if (slow_rsp_threshold > 32767)
1480 "slow response threshold set higher than recommended (0 to 32767)\n");
1481 #endif /* CONFIG_CIFS_STATS2 */
1483 atomic_set(&midCount, 0);
1484 GlobalCurrentXid = 0;
1485 GlobalTotalActiveXid = 0;
1486 GlobalMaxActiveXid = 0;
1487 spin_lock_init(&cifs_tcp_ses_lock);
1488 spin_lock_init(&GlobalMid_Lock);
1490 cifs_lock_secret = get_random_u32();
1492 if (cifs_max_pending < 2) {
1493 cifs_max_pending = 2;
1494 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1495 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1496 cifs_max_pending = CIFS_MAX_REQ;
1497 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1501 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1504 goto out_clean_proc;
1508 * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
1509 * so that we don't launch too many worker threads but
1510 * Documentation/workqueue.txt recommends setting it to 0
1513 /* WQ_UNBOUND allows decrypt tasks to run on any CPU */
1514 decrypt_wq = alloc_workqueue("smb3decryptd",
1515 WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1518 goto out_destroy_cifsiod_wq;
1521 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1522 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1523 if (!cifsoplockd_wq) {
1525 goto out_destroy_decrypt_wq;
1528 rc = cifs_fscache_register();
1530 goto out_destroy_cifsoplockd_wq;
1532 rc = cifs_init_inodecache();
1534 goto out_unreg_fscache;
1536 rc = cifs_init_mids();
1538 goto out_destroy_inodecache;
1540 rc = cifs_init_request_bufs();
1542 goto out_destroy_mids;
1544 #ifdef CONFIG_CIFS_DFS_UPCALL
1545 rc = dfs_cache_init();
1547 goto out_destroy_request_bufs;
1548 #endif /* CONFIG_CIFS_DFS_UPCALL */
1549 #ifdef CONFIG_CIFS_UPCALL
1550 rc = init_cifs_spnego();
1552 goto out_destroy_dfs_cache;
1553 #endif /* CONFIG_CIFS_UPCALL */
1555 rc = init_cifs_idmap();
1557 goto out_register_key_type;
1559 rc = register_filesystem(&cifs_fs_type);
1561 goto out_init_cifs_idmap;
1563 rc = register_filesystem(&smb3_fs_type);
1565 unregister_filesystem(&cifs_fs_type);
1566 goto out_init_cifs_idmap;
1571 out_init_cifs_idmap:
1573 out_register_key_type:
1574 #ifdef CONFIG_CIFS_UPCALL
1576 out_destroy_dfs_cache:
1578 #ifdef CONFIG_CIFS_DFS_UPCALL
1579 dfs_cache_destroy();
1580 out_destroy_request_bufs:
1582 cifs_destroy_request_bufs();
1584 cifs_destroy_mids();
1585 out_destroy_inodecache:
1586 cifs_destroy_inodecache();
1588 cifs_fscache_unregister();
1589 out_destroy_cifsoplockd_wq:
1590 destroy_workqueue(cifsoplockd_wq);
1591 out_destroy_decrypt_wq:
1592 destroy_workqueue(decrypt_wq);
1593 out_destroy_cifsiod_wq:
1594 destroy_workqueue(cifsiod_wq);
1603 cifs_dbg(NOISY, "exit_smb3\n");
1604 unregister_filesystem(&cifs_fs_type);
1605 unregister_filesystem(&smb3_fs_type);
1606 cifs_dfs_release_automount_timer();
1608 #ifdef CONFIG_CIFS_UPCALL
1611 #ifdef CONFIG_CIFS_DFS_UPCALL
1612 dfs_cache_destroy();
1614 cifs_destroy_request_bufs();
1615 cifs_destroy_mids();
1616 cifs_destroy_inodecache();
1617 cifs_fscache_unregister();
1618 destroy_workqueue(cifsoplockd_wq);
1619 destroy_workqueue(decrypt_wq);
1620 destroy_workqueue(cifsiod_wq);
1624 MODULE_AUTHOR("Steve French");
1625 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1627 ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and "
1628 "also older servers complying with the SNIA CIFS Specification)");
1629 MODULE_VERSION(CIFS_VERSION);
1630 MODULE_SOFTDEP("pre: des");
1631 MODULE_SOFTDEP("pre: ecb");
1632 MODULE_SOFTDEP("pre: hmac");
1633 MODULE_SOFTDEP("pre: md4");
1634 MODULE_SOFTDEP("pre: md5");
1635 MODULE_SOFTDEP("pre: nls");
1636 MODULE_SOFTDEP("pre: aes");
1637 MODULE_SOFTDEP("pre: cmac");
1638 MODULE_SOFTDEP("pre: sha256");
1639 MODULE_SOFTDEP("pre: sha512");
1640 MODULE_SOFTDEP("pre: aead2");
1641 MODULE_SOFTDEP("pre: ccm");
1642 MODULE_SOFTDEP("pre: gcm");
1643 module_init(init_cifs)
1644 module_exit(exit_cifs)