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"
58 bool enable_oplocks = true;
59 bool linuxExtEnabled = true;
60 bool lookupCacheEnabled = true;
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, 0444);
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, 0444);
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, 0444);
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;
89 struct workqueue_struct *cifsoplockd_wq;
90 __u32 cifs_lock_secret;
93 * Bumps refcount for cifs super block.
94 * Note that it should be only called if a referece to VFS super block is
95 * already held, e.g. in open-type syscalls context. Otherwise it can race with
96 * atomic_dec_and_test in deactivate_locked_super.
99 cifs_sb_active(struct super_block *sb)
101 struct cifs_sb_info *server = CIFS_SB(sb);
103 if (atomic_inc_return(&server->active) == 1)
104 atomic_inc(&sb->s_active);
108 cifs_sb_deactive(struct super_block *sb)
110 struct cifs_sb_info *server = CIFS_SB(sb);
112 if (atomic_dec_and_test(&server->active))
113 deactivate_super(sb);
117 cifs_read_super(struct super_block *sb)
120 struct cifs_sb_info *cifs_sb;
121 struct cifs_tcon *tcon;
124 cifs_sb = CIFS_SB(sb);
125 tcon = cifs_sb_master_tcon(cifs_sb);
127 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
128 sb->s_flags |= MS_POSIXACL;
130 if (tcon->ses->capabilities & tcon->ses->server->vals->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_xattr = cifs_xattr_handlers;
141 rc = super_setup_bdi(sb);
144 /* tune readahead according to rsize */
145 sb->s_bdi->ra_pages = cifs_sb->rsize / PAGE_SIZE;
147 sb->s_blocksize = CIFS_MAX_MSGSIZE;
148 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
149 inode = cifs_root_iget(sb);
157 sb->s_d_op = &cifs_ci_dentry_ops;
159 sb->s_d_op = &cifs_dentry_ops;
161 sb->s_root = d_make_root(inode);
167 #ifdef CONFIG_CIFS_NFSD_EXPORT
168 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
169 cifs_dbg(FYI, "export ops supported\n");
170 sb->s_export_op = &cifs_export_ops;
172 #endif /* CONFIG_CIFS_NFSD_EXPORT */
177 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
181 static void cifs_kill_sb(struct super_block *sb)
183 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
185 cifs_umount(cifs_sb);
189 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
191 struct super_block *sb = dentry->d_sb;
192 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
193 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
194 struct TCP_Server_Info *server = tcon->ses->server;
200 if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
202 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
204 buf->f_namelen = PATH_MAX;
206 buf->f_fsid.val[0] = tcon->vol_serial_number;
207 /* are using part of create time for more randomness, see man statfs */
208 buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time);
210 buf->f_files = 0; /* undefined */
211 buf->f_ffree = 0; /* unlimited */
213 if (server->ops->queryfs)
214 rc = server->ops->queryfs(xid, tcon, buf);
220 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
222 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
223 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
224 struct TCP_Server_Info *server = tcon->ses->server;
226 if (server->ops->fallocate)
227 return server->ops->fallocate(file, tcon, mode, off, len);
232 static int cifs_permission(struct inode *inode, int mask)
234 struct cifs_sb_info *cifs_sb;
236 cifs_sb = CIFS_SB(inode->i_sb);
238 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
239 if ((mask & MAY_EXEC) && !execute_ok(inode))
243 } else /* file mode might have been restricted at mount time
244 on the client (above and beyond ACL on servers) for
245 servers which do not support setting and viewing mode bits,
246 so allowing client to check permissions is useful */
247 return generic_permission(inode, mask);
250 static struct kmem_cache *cifs_inode_cachep;
251 static struct kmem_cache *cifs_req_cachep;
252 static struct kmem_cache *cifs_mid_cachep;
253 static struct kmem_cache *cifs_sm_req_cachep;
254 mempool_t *cifs_sm_req_poolp;
255 mempool_t *cifs_req_poolp;
256 mempool_t *cifs_mid_poolp;
258 static struct inode *
259 cifs_alloc_inode(struct super_block *sb)
261 struct cifsInodeInfo *cifs_inode;
262 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
265 cifs_inode->cifsAttrs = 0x20; /* default */
266 cifs_inode->time = 0;
268 * Until the file is open and we have gotten oplock info back from the
269 * server, can not assume caching of file data or metadata.
271 cifs_set_oplock_level(cifs_inode, 0);
272 cifs_inode->flags = 0;
273 spin_lock_init(&cifs_inode->writers_lock);
274 cifs_inode->writers = 0;
275 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
276 cifs_inode->server_eof = 0;
277 cifs_inode->uniqueid = 0;
278 cifs_inode->createtime = 0;
279 cifs_inode->epoch = 0;
280 generate_random_uuid(cifs_inode->lease_key);
283 * Can not set i_flags here - they get immediately overwritten to zero
286 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
287 INIT_LIST_HEAD(&cifs_inode->openFileList);
288 INIT_LIST_HEAD(&cifs_inode->llist);
289 return &cifs_inode->vfs_inode;
292 static void cifs_i_callback(struct rcu_head *head)
294 struct inode *inode = container_of(head, struct inode, i_rcu);
295 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
299 cifs_destroy_inode(struct inode *inode)
301 call_rcu(&inode->i_rcu, cifs_i_callback);
305 cifs_evict_inode(struct inode *inode)
307 truncate_inode_pages_final(&inode->i_data);
309 cifs_fscache_release_inode_cookie(inode);
313 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
315 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
316 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
318 seq_puts(s, ",addr=");
320 switch (server->dstaddr.ss_family) {
322 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
325 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
326 if (sa6->sin6_scope_id)
327 seq_printf(s, "%%%u", sa6->sin6_scope_id);
330 seq_puts(s, "(unknown)");
335 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
337 if (ses->sectype == Unspecified) {
338 if (ses->user_name == NULL)
339 seq_puts(s, ",sec=none");
343 seq_puts(s, ",sec=");
345 switch (ses->sectype) {
347 seq_puts(s, "lanman");
350 seq_puts(s, "ntlmv2");
359 seq_puts(s, "ntlmssp");
362 /* shouldn't ever happen */
363 seq_puts(s, "unknown");
372 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
374 seq_puts(s, ",cache=");
376 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
377 seq_puts(s, "strict");
378 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
381 seq_puts(s, "loose");
385 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
387 struct nls_table *def;
389 /* Display iocharset= option if it's not default charset */
390 def = load_nls_default();
392 seq_printf(s, ",iocharset=%s", cur->charset);
397 * cifs_show_options() is for displaying mount options in /proc/mounts.
398 * Not all settable options are displayed but most of the important
402 cifs_show_options(struct seq_file *s, struct dentry *root)
404 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
405 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
406 struct sockaddr *srcaddr;
407 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
409 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
410 cifs_show_security(s, tcon->ses);
411 cifs_show_cache_flavor(s, cifs_sb);
413 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
414 seq_puts(s, ",multiuser");
415 else if (tcon->ses->user_name)
416 seq_show_option(s, "username", tcon->ses->user_name);
418 if (tcon->ses->domainName)
419 seq_show_option(s, "domain", tcon->ses->domainName);
421 if (srcaddr->sa_family != AF_UNSPEC) {
422 struct sockaddr_in *saddr4;
423 struct sockaddr_in6 *saddr6;
424 saddr4 = (struct sockaddr_in *)srcaddr;
425 saddr6 = (struct sockaddr_in6 *)srcaddr;
426 if (srcaddr->sa_family == AF_INET6)
427 seq_printf(s, ",srcaddr=%pI6c",
429 else if (srcaddr->sa_family == AF_INET)
430 seq_printf(s, ",srcaddr=%pI4",
431 &saddr4->sin_addr.s_addr);
433 seq_printf(s, ",srcaddr=BAD-AF:%i",
434 (int)(srcaddr->sa_family));
437 seq_printf(s, ",uid=%u",
438 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
439 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
440 seq_puts(s, ",forceuid");
442 seq_puts(s, ",noforceuid");
444 seq_printf(s, ",gid=%u",
445 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
446 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
447 seq_puts(s, ",forcegid");
449 seq_puts(s, ",noforcegid");
451 cifs_show_address(s, tcon->ses->server);
454 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
455 cifs_sb->mnt_file_mode,
456 cifs_sb->mnt_dir_mode);
458 cifs_show_nls(s, cifs_sb->local_nls);
461 seq_puts(s, ",seal");
463 seq_puts(s, ",nocase");
465 seq_puts(s, ",hard");
467 seq_puts(s, ",soft");
468 if (tcon->use_persistent)
469 seq_puts(s, ",persistenthandles");
470 else if (tcon->use_resilient)
471 seq_puts(s, ",resilienthandles");
473 seq_puts(s, ",unix");
475 seq_puts(s, ",nounix");
476 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
477 seq_puts(s, ",posixpaths");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
479 seq_puts(s, ",setuids");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
481 seq_puts(s, ",idsfromsid");
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
483 seq_puts(s, ",serverino");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
485 seq_puts(s, ",rwpidforward");
486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
487 seq_puts(s, ",forcemand");
488 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
489 seq_puts(s, ",nouser_xattr");
490 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
491 seq_puts(s, ",mapchars");
492 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
493 seq_puts(s, ",mapposix");
494 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
496 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
497 seq_puts(s, ",nobrl");
498 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
499 seq_puts(s, ",cifsacl");
500 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
501 seq_puts(s, ",dynperm");
502 if (root->d_sb->s_flags & MS_POSIXACL)
504 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
505 seq_puts(s, ",mfsymlinks");
506 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
508 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
509 seq_puts(s, ",nostrictsync");
510 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
511 seq_puts(s, ",noperm");
512 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
513 seq_printf(s, ",backupuid=%u",
514 from_kuid_munged(&init_user_ns,
515 cifs_sb->mnt_backupuid));
516 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
517 seq_printf(s, ",backupgid=%u",
518 from_kgid_munged(&init_user_ns,
519 cifs_sb->mnt_backupgid));
521 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
522 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
523 seq_printf(s, ",echo_interval=%lu",
524 tcon->ses->server->echo_interval / HZ);
525 /* convert actimeo and display it in seconds */
526 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
531 static void cifs_umount_begin(struct super_block *sb)
533 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
534 struct cifs_tcon *tcon;
539 tcon = cifs_sb_master_tcon(cifs_sb);
541 spin_lock(&cifs_tcp_ses_lock);
542 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
543 /* we have other mounts to same share or we have
544 already tried to force umount this and woken up
545 all waiting network requests, nothing to do */
546 spin_unlock(&cifs_tcp_ses_lock);
548 } else if (tcon->tc_count == 1)
549 tcon->tidStatus = CifsExiting;
550 spin_unlock(&cifs_tcp_ses_lock);
552 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
553 /* cancel_notify_requests(tcon); */
554 if (tcon->ses && tcon->ses->server) {
555 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
556 wake_up_all(&tcon->ses->server->request_q);
557 wake_up_all(&tcon->ses->server->response_q);
558 msleep(1); /* yield */
559 /* we have to kick the requests once more */
560 wake_up_all(&tcon->ses->server->response_q);
567 #ifdef CONFIG_CIFS_STATS2
568 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
575 static int cifs_remount(struct super_block *sb, int *flags, char *data)
578 *flags |= MS_NODIRATIME;
582 static int cifs_drop_inode(struct inode *inode)
584 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
586 /* no serverino => unconditional eviction */
587 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
588 generic_drop_inode(inode);
591 static const struct super_operations cifs_super_ops = {
592 .statfs = cifs_statfs,
593 .alloc_inode = cifs_alloc_inode,
594 .destroy_inode = cifs_destroy_inode,
595 .drop_inode = cifs_drop_inode,
596 .evict_inode = cifs_evict_inode,
597 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
598 function unless later we add lazy close of inodes or unless the
599 kernel forgets to call us with the same number of releases (closes)
601 .show_options = cifs_show_options,
602 .umount_begin = cifs_umount_begin,
603 .remount_fs = cifs_remount,
604 #ifdef CONFIG_CIFS_STATS2
605 .show_stats = cifs_show_stats,
610 * Get root dentry from superblock according to prefix path mount option.
611 * Return dentry with refcount + 1 on success and NULL otherwise.
613 static struct dentry *
614 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
616 struct dentry *dentry;
617 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
618 char *full_path = NULL;
622 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
623 return dget(sb->s_root);
625 full_path = cifs_build_path_to_root(vol, cifs_sb,
626 cifs_sb_master_tcon(cifs_sb), 0);
627 if (full_path == NULL)
628 return ERR_PTR(-ENOMEM);
630 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
632 sep = CIFS_DIR_SEP(cifs_sb);
633 dentry = dget(sb->s_root);
637 struct inode *dir = d_inode(dentry);
638 struct dentry *child;
642 dentry = ERR_PTR(-ENOENT);
645 if (!S_ISDIR(dir->i_mode)) {
647 dentry = ERR_PTR(-ENOTDIR);
651 /* skip separators */
658 while (*s && *s != sep)
661 child = lookup_one_len_unlocked(p, dentry, s - p);
664 } while (!IS_ERR(dentry));
669 static int cifs_set_super(struct super_block *sb, void *data)
671 struct cifs_mnt_data *mnt_data = data;
672 sb->s_fs_info = mnt_data->cifs_sb;
673 return set_anon_super(sb, NULL);
676 static struct dentry *
677 cifs_do_mount(struct file_system_type *fs_type,
678 int flags, const char *dev_name, void *data)
681 struct super_block *sb;
682 struct cifs_sb_info *cifs_sb;
683 struct smb_vol *volume_info;
684 struct cifs_mnt_data mnt_data;
687 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
689 volume_info = cifs_get_volume_info((char *)data, dev_name);
690 if (IS_ERR(volume_info))
691 return ERR_CAST(volume_info);
693 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
694 if (cifs_sb == NULL) {
695 root = ERR_PTR(-ENOMEM);
699 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
700 if (cifs_sb->mountdata == NULL) {
701 root = ERR_PTR(-ENOMEM);
705 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
711 rc = cifs_mount(cifs_sb, volume_info);
713 if (!(flags & MS_SILENT))
714 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
720 mnt_data.vol = volume_info;
721 mnt_data.cifs_sb = cifs_sb;
722 mnt_data.flags = flags;
724 /* BB should we make this contingent on mount parm? */
725 flags |= MS_NODIRATIME | MS_NOATIME;
727 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
730 cifs_umount(cifs_sb);
735 cifs_dbg(FYI, "Use existing superblock\n");
736 cifs_umount(cifs_sb);
738 rc = cifs_read_super(sb);
744 sb->s_flags |= MS_ACTIVE;
747 root = cifs_get_root(volume_info, sb);
751 cifs_dbg(FYI, "dentry root is: %p\n", root);
755 deactivate_locked_super(sb);
758 cifs_cleanup_volume_info(volume_info);
762 kfree(cifs_sb->prepath);
763 kfree(cifs_sb->mountdata);
766 unload_nls(volume_info->local_nls);
771 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
774 struct inode *inode = file_inode(iocb->ki_filp);
776 if (iocb->ki_flags & IOCB_DIRECT)
777 return cifs_user_readv(iocb, iter);
779 rc = cifs_revalidate_mapping(inode);
783 return generic_file_read_iter(iocb, iter);
786 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
788 struct inode *inode = file_inode(iocb->ki_filp);
789 struct cifsInodeInfo *cinode = CIFS_I(inode);
793 if (iocb->ki_filp->f_flags & O_DIRECT) {
794 written = cifs_user_writev(iocb, from);
795 if (written > 0 && CIFS_CACHE_READ(cinode)) {
796 cifs_zap_mapping(inode);
798 "Set no oplock for inode=%p after a write operation\n",
805 written = cifs_get_writer(cinode);
809 written = generic_file_write_iter(iocb, from);
811 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
814 rc = filemap_fdatawrite(inode->i_mapping);
816 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
820 cifs_put_writer(cinode);
824 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
827 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
828 * the cached file length
830 if (whence != SEEK_SET && whence != SEEK_CUR) {
832 struct inode *inode = file_inode(file);
835 * We need to be sure that all dirty pages are written and the
836 * server has the newest file length.
838 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
839 inode->i_mapping->nrpages != 0) {
840 rc = filemap_fdatawait(inode->i_mapping);
842 mapping_set_error(inode->i_mapping, rc);
847 * Some applications poll for the file length in this strange
848 * way so we must seek to end on non-oplocked files by
849 * setting the revalidate time to zero.
851 CIFS_I(inode)->time = 0;
853 rc = cifs_revalidate_file_attr(file);
857 return generic_file_llseek(file, offset, whence);
861 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
864 * Note that this is called by vfs setlease with i_lock held to
865 * protect *lease from going away.
867 struct inode *inode = file_inode(file);
868 struct cifsFileInfo *cfile = file->private_data;
870 if (!(S_ISREG(inode->i_mode)))
873 /* Check if file is oplocked if this is request for new lease */
874 if (arg == F_UNLCK ||
875 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
876 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
877 return generic_setlease(file, arg, lease, priv);
878 else if (tlink_tcon(cfile->tlink)->local_lease &&
879 !CIFS_CACHE_READ(CIFS_I(inode)))
881 * If the server claims to support oplock on this file, then we
882 * still need to check oplock even if the local_lease mount
883 * option is set, but there are servers which do not support
884 * oplock for which this mount option may be useful if the user
885 * knows that the file won't be changed on the server by anyone
888 return generic_setlease(file, arg, lease, priv);
893 struct file_system_type cifs_fs_type = {
894 .owner = THIS_MODULE,
896 .mount = cifs_do_mount,
897 .kill_sb = cifs_kill_sb,
900 MODULE_ALIAS_FS("cifs");
901 const struct inode_operations cifs_dir_inode_ops = {
902 .create = cifs_create,
903 .atomic_open = cifs_atomic_open,
904 .lookup = cifs_lookup,
905 .getattr = cifs_getattr,
906 .unlink = cifs_unlink,
907 .link = cifs_hardlink,
910 .rename = cifs_rename2,
911 .permission = cifs_permission,
912 .setattr = cifs_setattr,
913 .symlink = cifs_symlink,
915 .listxattr = cifs_listxattr,
918 const struct inode_operations cifs_file_inode_ops = {
919 .setattr = cifs_setattr,
920 .getattr = cifs_getattr,
921 .permission = cifs_permission,
922 .listxattr = cifs_listxattr,
925 const struct inode_operations cifs_symlink_inode_ops = {
926 .get_link = cifs_get_link,
927 .permission = cifs_permission,
928 .listxattr = cifs_listxattr,
931 static int cifs_clone_file_range(struct file *src_file, loff_t off,
932 struct file *dst_file, loff_t destoff, u64 len)
934 struct inode *src_inode = file_inode(src_file);
935 struct inode *target_inode = file_inode(dst_file);
936 struct cifsFileInfo *smb_file_src = src_file->private_data;
937 struct cifsFileInfo *smb_file_target;
938 struct cifs_tcon *target_tcon;
942 cifs_dbg(FYI, "clone range\n");
946 if (!src_file->private_data || !dst_file->private_data) {
948 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
952 smb_file_target = dst_file->private_data;
953 target_tcon = tlink_tcon(smb_file_target->tlink);
956 * Note: cifs case is easier than btrfs since server responsible for
957 * checks for proper open modes and file type and if it wants
958 * server could even support copy of range where source = target
960 lock_two_nondirectories(target_inode, src_inode);
963 len = src_inode->i_size - off;
965 cifs_dbg(FYI, "about to flush pages\n");
966 /* should we flush first and last page first */
967 truncate_inode_pages_range(&target_inode->i_data, destoff,
968 PAGE_ALIGN(destoff + len)-1);
970 if (target_tcon->ses->server->ops->duplicate_extents)
971 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
972 smb_file_src, smb_file_target, off, len, destoff);
976 /* force revalidate of size and timestamps of target file now
977 that target is updated on the server */
978 CIFS_I(target_inode)->time = 0;
979 /* although unlocking in the reverse order from locking is not
980 strictly necessary here it is a little cleaner to be consistent */
981 unlock_two_nondirectories(src_inode, target_inode);
987 ssize_t cifs_file_copychunk_range(unsigned int xid,
988 struct file *src_file, loff_t off,
989 struct file *dst_file, loff_t destoff,
990 size_t len, unsigned int flags)
992 struct inode *src_inode = file_inode(src_file);
993 struct inode *target_inode = file_inode(dst_file);
994 struct cifsFileInfo *smb_file_src;
995 struct cifsFileInfo *smb_file_target;
996 struct cifs_tcon *src_tcon;
997 struct cifs_tcon *target_tcon;
1000 cifs_dbg(FYI, "copychunk range\n");
1002 if (src_inode == target_inode) {
1007 if (!src_file->private_data || !dst_file->private_data) {
1009 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1014 smb_file_target = dst_file->private_data;
1015 smb_file_src = src_file->private_data;
1016 src_tcon = tlink_tcon(smb_file_src->tlink);
1017 target_tcon = tlink_tcon(smb_file_target->tlink);
1019 if (src_tcon->ses != target_tcon->ses) {
1020 cifs_dbg(VFS, "source and target of copy not on same server\n");
1025 * Note: cifs case is easier than btrfs since server responsible for
1026 * checks for proper open modes and file type and if it wants
1027 * server could even support copy of range where source = target
1029 lock_two_nondirectories(target_inode, src_inode);
1031 cifs_dbg(FYI, "about to flush pages\n");
1032 /* should we flush first and last page first */
1033 truncate_inode_pages(&target_inode->i_data, 0);
1035 if (target_tcon->ses->server->ops->copychunk_range)
1036 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1037 smb_file_src, smb_file_target, off, len, destoff);
1041 /* force revalidate of size and timestamps of target file now
1042 * that target is updated on the server
1044 CIFS_I(target_inode)->time = 0;
1045 /* although unlocking in the reverse order from locking is not
1046 * strictly necessary here it is a little cleaner to be consistent
1048 unlock_two_nondirectories(src_inode, target_inode);
1055 * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync()
1056 * is a dummy operation.
1058 static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1060 cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n",
1066 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1067 struct file *dst_file, loff_t destoff,
1068 size_t len, unsigned int flags)
1070 unsigned int xid = get_xid();
1073 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1079 const struct file_operations cifs_file_ops = {
1080 .read_iter = cifs_loose_read_iter,
1081 .write_iter = cifs_file_write_iter,
1083 .release = cifs_close,
1085 .fsync = cifs_fsync,
1086 .flush = cifs_flush,
1087 .mmap = cifs_file_mmap,
1088 .splice_read = generic_file_splice_read,
1089 .llseek = cifs_llseek,
1090 .unlocked_ioctl = cifs_ioctl,
1091 .copy_file_range = cifs_copy_file_range,
1092 .clone_file_range = cifs_clone_file_range,
1093 .setlease = cifs_setlease,
1094 .fallocate = cifs_fallocate,
1097 const struct file_operations cifs_file_strict_ops = {
1098 .read_iter = cifs_strict_readv,
1099 .write_iter = cifs_strict_writev,
1101 .release = cifs_close,
1103 .fsync = cifs_strict_fsync,
1104 .flush = cifs_flush,
1105 .mmap = cifs_file_strict_mmap,
1106 .splice_read = generic_file_splice_read,
1107 .llseek = cifs_llseek,
1108 .unlocked_ioctl = cifs_ioctl,
1109 .copy_file_range = cifs_copy_file_range,
1110 .clone_file_range = cifs_clone_file_range,
1111 .setlease = cifs_setlease,
1112 .fallocate = cifs_fallocate,
1115 const struct file_operations cifs_file_direct_ops = {
1116 /* BB reevaluate whether they can be done with directio, no cache */
1117 .read_iter = cifs_user_readv,
1118 .write_iter = cifs_user_writev,
1120 .release = cifs_close,
1122 .fsync = cifs_fsync,
1123 .flush = cifs_flush,
1124 .mmap = cifs_file_mmap,
1125 .splice_read = generic_file_splice_read,
1126 .unlocked_ioctl = cifs_ioctl,
1127 .copy_file_range = cifs_copy_file_range,
1128 .clone_file_range = cifs_clone_file_range,
1129 .llseek = cifs_llseek,
1130 .setlease = cifs_setlease,
1131 .fallocate = cifs_fallocate,
1134 const struct file_operations cifs_file_nobrl_ops = {
1135 .read_iter = cifs_loose_read_iter,
1136 .write_iter = cifs_file_write_iter,
1138 .release = cifs_close,
1139 .fsync = cifs_fsync,
1140 .flush = cifs_flush,
1141 .mmap = cifs_file_mmap,
1142 .splice_read = generic_file_splice_read,
1143 .llseek = cifs_llseek,
1144 .unlocked_ioctl = cifs_ioctl,
1145 .copy_file_range = cifs_copy_file_range,
1146 .clone_file_range = cifs_clone_file_range,
1147 .setlease = cifs_setlease,
1148 .fallocate = cifs_fallocate,
1151 const struct file_operations cifs_file_strict_nobrl_ops = {
1152 .read_iter = cifs_strict_readv,
1153 .write_iter = cifs_strict_writev,
1155 .release = cifs_close,
1156 .fsync = cifs_strict_fsync,
1157 .flush = cifs_flush,
1158 .mmap = cifs_file_strict_mmap,
1159 .splice_read = generic_file_splice_read,
1160 .llseek = cifs_llseek,
1161 .unlocked_ioctl = cifs_ioctl,
1162 .copy_file_range = cifs_copy_file_range,
1163 .clone_file_range = cifs_clone_file_range,
1164 .setlease = cifs_setlease,
1165 .fallocate = cifs_fallocate,
1168 const struct file_operations cifs_file_direct_nobrl_ops = {
1169 /* BB reevaluate whether they can be done with directio, no cache */
1170 .read_iter = cifs_user_readv,
1171 .write_iter = cifs_user_writev,
1173 .release = cifs_close,
1174 .fsync = cifs_fsync,
1175 .flush = cifs_flush,
1176 .mmap = cifs_file_mmap,
1177 .splice_read = generic_file_splice_read,
1178 .unlocked_ioctl = cifs_ioctl,
1179 .copy_file_range = cifs_copy_file_range,
1180 .clone_file_range = cifs_clone_file_range,
1181 .llseek = cifs_llseek,
1182 .setlease = cifs_setlease,
1183 .fallocate = cifs_fallocate,
1186 const struct file_operations cifs_dir_ops = {
1187 .iterate_shared = cifs_readdir,
1188 .release = cifs_closedir,
1189 .read = generic_read_dir,
1190 .unlocked_ioctl = cifs_ioctl,
1191 .copy_file_range = cifs_copy_file_range,
1192 .clone_file_range = cifs_clone_file_range,
1193 .llseek = generic_file_llseek,
1194 .fsync = cifs_dir_fsync,
1198 cifs_init_once(void *inode)
1200 struct cifsInodeInfo *cifsi = inode;
1202 inode_init_once(&cifsi->vfs_inode);
1203 init_rwsem(&cifsi->lock_sem);
1207 cifs_init_inodecache(void)
1209 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1210 sizeof(struct cifsInodeInfo),
1211 0, (SLAB_RECLAIM_ACCOUNT|
1212 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1214 if (cifs_inode_cachep == NULL)
1221 cifs_destroy_inodecache(void)
1224 * Make sure all delayed rcu free inodes are flushed before we
1228 kmem_cache_destroy(cifs_inode_cachep);
1232 cifs_init_request_bufs(void)
1235 * SMB2 maximum header size is bigger than CIFS one - no problems to
1236 * allocate some more bytes for CIFS.
1238 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1240 if (CIFSMaxBufSize < 8192) {
1241 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1242 Unicode path name has to fit in any SMB/CIFS path based frames */
1243 CIFSMaxBufSize = 8192;
1244 } else if (CIFSMaxBufSize > 1024*127) {
1245 CIFSMaxBufSize = 1024 * 127;
1247 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1250 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1251 CIFSMaxBufSize, CIFSMaxBufSize);
1253 cifs_req_cachep = kmem_cache_create("cifs_request",
1254 CIFSMaxBufSize + max_hdr_size, 0,
1255 SLAB_HWCACHE_ALIGN, NULL);
1256 if (cifs_req_cachep == NULL)
1259 if (cifs_min_rcv < 1)
1261 else if (cifs_min_rcv > 64) {
1263 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1266 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1269 if (cifs_req_poolp == NULL) {
1270 kmem_cache_destroy(cifs_req_cachep);
1273 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1274 almost all handle based requests (but not write response, nor is it
1275 sufficient for path based requests). A smaller size would have
1276 been more efficient (compacting multiple slab items on one 4k page)
1277 for the case in which debug was on, but this larger size allows
1278 more SMBs to use small buffer alloc and is still much more
1279 efficient to alloc 1 per page off the slab compared to 17K (5page)
1280 alloc of large cifs buffers even when page debugging is on */
1281 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1282 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1284 if (cifs_sm_req_cachep == NULL) {
1285 mempool_destroy(cifs_req_poolp);
1286 kmem_cache_destroy(cifs_req_cachep);
1290 if (cifs_min_small < 2)
1292 else if (cifs_min_small > 256) {
1293 cifs_min_small = 256;
1294 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1297 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1298 cifs_sm_req_cachep);
1300 if (cifs_sm_req_poolp == NULL) {
1301 mempool_destroy(cifs_req_poolp);
1302 kmem_cache_destroy(cifs_req_cachep);
1303 kmem_cache_destroy(cifs_sm_req_cachep);
1311 cifs_destroy_request_bufs(void)
1313 mempool_destroy(cifs_req_poolp);
1314 kmem_cache_destroy(cifs_req_cachep);
1315 mempool_destroy(cifs_sm_req_poolp);
1316 kmem_cache_destroy(cifs_sm_req_cachep);
1320 cifs_init_mids(void)
1322 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1323 sizeof(struct mid_q_entry), 0,
1324 SLAB_HWCACHE_ALIGN, NULL);
1325 if (cifs_mid_cachep == NULL)
1328 /* 3 is a reasonable minimum number of simultaneous operations */
1329 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1330 if (cifs_mid_poolp == NULL) {
1331 kmem_cache_destroy(cifs_mid_cachep);
1339 cifs_destroy_mids(void)
1341 mempool_destroy(cifs_mid_poolp);
1342 kmem_cache_destroy(cifs_mid_cachep);
1350 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1351 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1352 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1353 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1354 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1356 * Initialize Global counters
1358 atomic_set(&sesInfoAllocCount, 0);
1359 atomic_set(&tconInfoAllocCount, 0);
1360 atomic_set(&tcpSesAllocCount, 0);
1361 atomic_set(&tcpSesReconnectCount, 0);
1362 atomic_set(&tconInfoReconnectCount, 0);
1364 atomic_set(&bufAllocCount, 0);
1365 atomic_set(&smBufAllocCount, 0);
1366 #ifdef CONFIG_CIFS_STATS2
1367 atomic_set(&totBufAllocCount, 0);
1368 atomic_set(&totSmBufAllocCount, 0);
1369 #endif /* CONFIG_CIFS_STATS2 */
1371 atomic_set(&midCount, 0);
1372 GlobalCurrentXid = 0;
1373 GlobalTotalActiveXid = 0;
1374 GlobalMaxActiveXid = 0;
1375 spin_lock_init(&cifs_tcp_ses_lock);
1376 spin_lock_init(&GlobalMid_Lock);
1378 cifs_lock_secret = get_random_u32();
1380 if (cifs_max_pending < 2) {
1381 cifs_max_pending = 2;
1382 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1383 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1384 cifs_max_pending = CIFS_MAX_REQ;
1385 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1389 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1392 goto out_clean_proc;
1395 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1396 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1397 if (!cifsoplockd_wq) {
1399 goto out_destroy_cifsiod_wq;
1402 rc = cifs_fscache_register();
1404 goto out_destroy_cifsoplockd_wq;
1406 rc = cifs_init_inodecache();
1408 goto out_unreg_fscache;
1410 rc = cifs_init_mids();
1412 goto out_destroy_inodecache;
1414 rc = cifs_init_request_bufs();
1416 goto out_destroy_mids;
1418 #ifdef CONFIG_CIFS_UPCALL
1419 rc = init_cifs_spnego();
1421 goto out_destroy_request_bufs;
1422 #endif /* CONFIG_CIFS_UPCALL */
1424 #ifdef CONFIG_CIFS_ACL
1425 rc = init_cifs_idmap();
1427 goto out_register_key_type;
1428 #endif /* CONFIG_CIFS_ACL */
1430 rc = register_filesystem(&cifs_fs_type);
1432 goto out_init_cifs_idmap;
1436 out_init_cifs_idmap:
1437 #ifdef CONFIG_CIFS_ACL
1439 out_register_key_type:
1441 #ifdef CONFIG_CIFS_UPCALL
1443 out_destroy_request_bufs:
1445 cifs_destroy_request_bufs();
1447 cifs_destroy_mids();
1448 out_destroy_inodecache:
1449 cifs_destroy_inodecache();
1451 cifs_fscache_unregister();
1452 out_destroy_cifsoplockd_wq:
1453 destroy_workqueue(cifsoplockd_wq);
1454 out_destroy_cifsiod_wq:
1455 destroy_workqueue(cifsiod_wq);
1464 cifs_dbg(NOISY, "exit_cifs\n");
1465 unregister_filesystem(&cifs_fs_type);
1466 cifs_dfs_release_automount_timer();
1467 #ifdef CONFIG_CIFS_ACL
1470 #ifdef CONFIG_CIFS_UPCALL
1473 cifs_destroy_request_bufs();
1474 cifs_destroy_mids();
1475 cifs_destroy_inodecache();
1476 cifs_fscache_unregister();
1477 destroy_workqueue(cifsoplockd_wq);
1478 destroy_workqueue(cifsiod_wq);
1482 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1483 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1485 ("VFS to access servers complying with the SNIA CIFS Specification "
1486 "e.g. Samba and Windows");
1487 MODULE_VERSION(CIFS_VERSION);
1488 MODULE_SOFTDEP("pre: arc4");
1489 MODULE_SOFTDEP("pre: des");
1490 MODULE_SOFTDEP("pre: ecb");
1491 MODULE_SOFTDEP("pre: hmac");
1492 MODULE_SOFTDEP("pre: md4");
1493 MODULE_SOFTDEP("pre: md5");
1494 MODULE_SOFTDEP("pre: nls");
1495 MODULE_SOFTDEP("pre: aes");
1496 MODULE_SOFTDEP("pre: cmac");
1497 MODULE_SOFTDEP("pre: sha256");
1498 MODULE_SOFTDEP("pre: sha512");
1499 MODULE_SOFTDEP("pre: aead2");
1500 MODULE_SOFTDEP("pre: ccm");
1501 module_init(init_cifs)
1502 module_exit(exit_cifs)