4 * Copyright (C) International Business Machines Corp., 2002,2008
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;
201 * PATH_MAX may be too long - it would presumably be total path,
202 * but note that some servers (includinng Samba 3) have a shorter
205 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
207 buf->f_namelen = PATH_MAX;
208 buf->f_files = 0; /* undefined */
209 buf->f_ffree = 0; /* unlimited */
211 if (server->ops->queryfs)
212 rc = server->ops->queryfs(xid, tcon, buf);
218 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
220 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
221 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
222 struct TCP_Server_Info *server = tcon->ses->server;
224 if (server->ops->fallocate)
225 return server->ops->fallocate(file, tcon, mode, off, len);
230 static int cifs_permission(struct inode *inode, int mask)
232 struct cifs_sb_info *cifs_sb;
234 cifs_sb = CIFS_SB(inode->i_sb);
236 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
237 if ((mask & MAY_EXEC) && !execute_ok(inode))
241 } else /* file mode might have been restricted at mount time
242 on the client (above and beyond ACL on servers) for
243 servers which do not support setting and viewing mode bits,
244 so allowing client to check permissions is useful */
245 return generic_permission(inode, mask);
248 static struct kmem_cache *cifs_inode_cachep;
249 static struct kmem_cache *cifs_req_cachep;
250 static struct kmem_cache *cifs_mid_cachep;
251 static struct kmem_cache *cifs_sm_req_cachep;
252 mempool_t *cifs_sm_req_poolp;
253 mempool_t *cifs_req_poolp;
254 mempool_t *cifs_mid_poolp;
256 static struct inode *
257 cifs_alloc_inode(struct super_block *sb)
259 struct cifsInodeInfo *cifs_inode;
260 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
263 cifs_inode->cifsAttrs = 0x20; /* default */
264 cifs_inode->time = 0;
266 * Until the file is open and we have gotten oplock info back from the
267 * server, can not assume caching of file data or metadata.
269 cifs_set_oplock_level(cifs_inode, 0);
270 cifs_inode->flags = 0;
271 spin_lock_init(&cifs_inode->writers_lock);
272 cifs_inode->writers = 0;
273 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
274 cifs_inode->server_eof = 0;
275 cifs_inode->uniqueid = 0;
276 cifs_inode->createtime = 0;
277 cifs_inode->epoch = 0;
278 generate_random_uuid(cifs_inode->lease_key);
281 * Can not set i_flags here - they get immediately overwritten to zero
284 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
285 INIT_LIST_HEAD(&cifs_inode->openFileList);
286 INIT_LIST_HEAD(&cifs_inode->llist);
287 return &cifs_inode->vfs_inode;
290 static void cifs_i_callback(struct rcu_head *head)
292 struct inode *inode = container_of(head, struct inode, i_rcu);
293 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
297 cifs_destroy_inode(struct inode *inode)
299 call_rcu(&inode->i_rcu, cifs_i_callback);
303 cifs_evict_inode(struct inode *inode)
305 truncate_inode_pages_final(&inode->i_data);
307 cifs_fscache_release_inode_cookie(inode);
311 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
313 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
314 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
316 seq_puts(s, ",addr=");
318 switch (server->dstaddr.ss_family) {
320 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
323 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
324 if (sa6->sin6_scope_id)
325 seq_printf(s, "%%%u", sa6->sin6_scope_id);
328 seq_puts(s, "(unknown)");
333 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
335 if (ses->sectype == Unspecified) {
336 if (ses->user_name == NULL)
337 seq_puts(s, ",sec=none");
341 seq_puts(s, ",sec=");
343 switch (ses->sectype) {
345 seq_puts(s, "lanman");
348 seq_puts(s, "ntlmv2");
357 seq_puts(s, "ntlmssp");
360 /* shouldn't ever happen */
361 seq_puts(s, "unknown");
370 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
372 seq_puts(s, ",cache=");
374 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
375 seq_puts(s, "strict");
376 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
379 seq_puts(s, "loose");
383 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
385 struct nls_table *def;
387 /* Display iocharset= option if it's not default charset */
388 def = load_nls_default();
390 seq_printf(s, ",iocharset=%s", cur->charset);
395 * cifs_show_options() is for displaying mount options in /proc/mounts.
396 * Not all settable options are displayed but most of the important
400 cifs_show_options(struct seq_file *s, struct dentry *root)
402 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
403 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
404 struct sockaddr *srcaddr;
405 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
407 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
408 cifs_show_security(s, tcon->ses);
409 cifs_show_cache_flavor(s, cifs_sb);
411 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
412 seq_puts(s, ",multiuser");
413 else if (tcon->ses->user_name)
414 seq_show_option(s, "username", tcon->ses->user_name);
416 if (tcon->ses->domainName)
417 seq_show_option(s, "domain", tcon->ses->domainName);
419 if (srcaddr->sa_family != AF_UNSPEC) {
420 struct sockaddr_in *saddr4;
421 struct sockaddr_in6 *saddr6;
422 saddr4 = (struct sockaddr_in *)srcaddr;
423 saddr6 = (struct sockaddr_in6 *)srcaddr;
424 if (srcaddr->sa_family == AF_INET6)
425 seq_printf(s, ",srcaddr=%pI6c",
427 else if (srcaddr->sa_family == AF_INET)
428 seq_printf(s, ",srcaddr=%pI4",
429 &saddr4->sin_addr.s_addr);
431 seq_printf(s, ",srcaddr=BAD-AF:%i",
432 (int)(srcaddr->sa_family));
435 seq_printf(s, ",uid=%u",
436 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
437 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
438 seq_puts(s, ",forceuid");
440 seq_puts(s, ",noforceuid");
442 seq_printf(s, ",gid=%u",
443 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
444 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
445 seq_puts(s, ",forcegid");
447 seq_puts(s, ",noforcegid");
449 cifs_show_address(s, tcon->ses->server);
452 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
453 cifs_sb->mnt_file_mode,
454 cifs_sb->mnt_dir_mode);
456 cifs_show_nls(s, cifs_sb->local_nls);
459 seq_puts(s, ",seal");
461 seq_puts(s, ",nocase");
463 seq_puts(s, ",hard");
464 if (tcon->use_persistent)
465 seq_puts(s, ",persistenthandles");
466 else if (tcon->use_resilient)
467 seq_puts(s, ",resilienthandles");
469 seq_puts(s, ",unix");
471 seq_puts(s, ",nounix");
472 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
473 seq_puts(s, ",posixpaths");
474 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
475 seq_puts(s, ",setuids");
476 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
477 seq_puts(s, ",idsfromsid");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
479 seq_puts(s, ",serverino");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
481 seq_puts(s, ",rwpidforward");
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
483 seq_puts(s, ",forcemand");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
485 seq_puts(s, ",nouser_xattr");
486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
487 seq_puts(s, ",mapchars");
488 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
489 seq_puts(s, ",mapposix");
490 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
492 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
493 seq_puts(s, ",nobrl");
494 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
495 seq_puts(s, ",cifsacl");
496 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
497 seq_puts(s, ",dynperm");
498 if (root->d_sb->s_flags & MS_POSIXACL)
500 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
501 seq_puts(s, ",mfsymlinks");
502 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
504 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
505 seq_puts(s, ",nostrictsync");
506 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
507 seq_puts(s, ",noperm");
508 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
509 seq_printf(s, ",backupuid=%u",
510 from_kuid_munged(&init_user_ns,
511 cifs_sb->mnt_backupuid));
512 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
513 seq_printf(s, ",backupgid=%u",
514 from_kgid_munged(&init_user_ns,
515 cifs_sb->mnt_backupgid));
517 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
518 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
519 seq_printf(s, ",echo_interval=%lu",
520 tcon->ses->server->echo_interval / HZ);
521 /* convert actimeo and display it in seconds */
522 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
527 static void cifs_umount_begin(struct super_block *sb)
529 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
530 struct cifs_tcon *tcon;
535 tcon = cifs_sb_master_tcon(cifs_sb);
537 spin_lock(&cifs_tcp_ses_lock);
538 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
539 /* we have other mounts to same share or we have
540 already tried to force umount this and woken up
541 all waiting network requests, nothing to do */
542 spin_unlock(&cifs_tcp_ses_lock);
544 } else if (tcon->tc_count == 1)
545 tcon->tidStatus = CifsExiting;
546 spin_unlock(&cifs_tcp_ses_lock);
548 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
549 /* cancel_notify_requests(tcon); */
550 if (tcon->ses && tcon->ses->server) {
551 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
552 wake_up_all(&tcon->ses->server->request_q);
553 wake_up_all(&tcon->ses->server->response_q);
554 msleep(1); /* yield */
555 /* we have to kick the requests once more */
556 wake_up_all(&tcon->ses->server->response_q);
563 #ifdef CONFIG_CIFS_STATS2
564 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
571 static int cifs_remount(struct super_block *sb, int *flags, char *data)
574 *flags |= MS_NODIRATIME;
578 static int cifs_drop_inode(struct inode *inode)
580 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
582 /* no serverino => unconditional eviction */
583 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
584 generic_drop_inode(inode);
587 static const struct super_operations cifs_super_ops = {
588 .statfs = cifs_statfs,
589 .alloc_inode = cifs_alloc_inode,
590 .destroy_inode = cifs_destroy_inode,
591 .drop_inode = cifs_drop_inode,
592 .evict_inode = cifs_evict_inode,
593 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
594 function unless later we add lazy close of inodes or unless the
595 kernel forgets to call us with the same number of releases (closes)
597 .show_options = cifs_show_options,
598 .umount_begin = cifs_umount_begin,
599 .remount_fs = cifs_remount,
600 #ifdef CONFIG_CIFS_STATS2
601 .show_stats = cifs_show_stats,
606 * Get root dentry from superblock according to prefix path mount option.
607 * Return dentry with refcount + 1 on success and NULL otherwise.
609 static struct dentry *
610 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
612 struct dentry *dentry;
613 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
614 char *full_path = NULL;
618 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
619 return dget(sb->s_root);
621 full_path = cifs_build_path_to_root(vol, cifs_sb,
622 cifs_sb_master_tcon(cifs_sb), 0);
623 if (full_path == NULL)
624 return ERR_PTR(-ENOMEM);
626 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
628 sep = CIFS_DIR_SEP(cifs_sb);
629 dentry = dget(sb->s_root);
633 struct inode *dir = d_inode(dentry);
634 struct dentry *child;
638 dentry = ERR_PTR(-ENOENT);
641 if (!S_ISDIR(dir->i_mode)) {
643 dentry = ERR_PTR(-ENOTDIR);
647 /* skip separators */
654 while (*s && *s != sep)
657 child = lookup_one_len_unlocked(p, dentry, s - p);
660 } while (!IS_ERR(dentry));
665 static int cifs_set_super(struct super_block *sb, void *data)
667 struct cifs_mnt_data *mnt_data = data;
668 sb->s_fs_info = mnt_data->cifs_sb;
669 return set_anon_super(sb, NULL);
672 static struct dentry *
673 cifs_do_mount(struct file_system_type *fs_type,
674 int flags, const char *dev_name, void *data)
677 struct super_block *sb;
678 struct cifs_sb_info *cifs_sb;
679 struct smb_vol *volume_info;
680 struct cifs_mnt_data mnt_data;
683 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
685 volume_info = cifs_get_volume_info((char *)data, dev_name);
686 if (IS_ERR(volume_info))
687 return ERR_CAST(volume_info);
689 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
690 if (cifs_sb == NULL) {
691 root = ERR_PTR(-ENOMEM);
695 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
696 if (cifs_sb->mountdata == NULL) {
697 root = ERR_PTR(-ENOMEM);
701 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
707 rc = cifs_mount(cifs_sb, volume_info);
709 if (!(flags & MS_SILENT))
710 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
716 mnt_data.vol = volume_info;
717 mnt_data.cifs_sb = cifs_sb;
718 mnt_data.flags = flags;
720 /* BB should we make this contingent on mount parm? */
721 flags |= MS_NODIRATIME | MS_NOATIME;
723 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
726 cifs_umount(cifs_sb);
731 cifs_dbg(FYI, "Use existing superblock\n");
732 cifs_umount(cifs_sb);
734 rc = cifs_read_super(sb);
740 sb->s_flags |= MS_ACTIVE;
743 root = cifs_get_root(volume_info, sb);
747 cifs_dbg(FYI, "dentry root is: %p\n", root);
751 deactivate_locked_super(sb);
753 cifs_cleanup_volume_info(volume_info);
757 kfree(cifs_sb->prepath);
758 kfree(cifs_sb->mountdata);
761 unload_nls(volume_info->local_nls);
766 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
769 struct inode *inode = file_inode(iocb->ki_filp);
771 if (iocb->ki_filp->f_flags & O_DIRECT)
772 return cifs_user_readv(iocb, iter);
774 rc = cifs_revalidate_mapping(inode);
778 return generic_file_read_iter(iocb, iter);
781 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
783 struct inode *inode = file_inode(iocb->ki_filp);
784 struct cifsInodeInfo *cinode = CIFS_I(inode);
788 if (iocb->ki_filp->f_flags & O_DIRECT) {
789 written = cifs_user_writev(iocb, from);
790 if (written > 0 && CIFS_CACHE_READ(cinode)) {
791 cifs_zap_mapping(inode);
793 "Set no oplock for inode=%p after a write operation\n",
800 written = cifs_get_writer(cinode);
804 written = generic_file_write_iter(iocb, from);
806 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
809 rc = filemap_fdatawrite(inode->i_mapping);
811 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
815 cifs_put_writer(cinode);
819 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
822 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
823 * the cached file length
825 if (whence != SEEK_SET && whence != SEEK_CUR) {
827 struct inode *inode = file_inode(file);
830 * We need to be sure that all dirty pages are written and the
831 * server has the newest file length.
833 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
834 inode->i_mapping->nrpages != 0) {
835 rc = filemap_fdatawait(inode->i_mapping);
837 mapping_set_error(inode->i_mapping, rc);
842 * Some applications poll for the file length in this strange
843 * way so we must seek to end on non-oplocked files by
844 * setting the revalidate time to zero.
846 CIFS_I(inode)->time = 0;
848 rc = cifs_revalidate_file_attr(file);
852 return generic_file_llseek(file, offset, whence);
856 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
859 * Note that this is called by vfs setlease with i_lock held to
860 * protect *lease from going away.
862 struct inode *inode = file_inode(file);
863 struct cifsFileInfo *cfile = file->private_data;
865 if (!(S_ISREG(inode->i_mode)))
868 /* Check if file is oplocked if this is request for new lease */
869 if (arg == F_UNLCK ||
870 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
871 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
872 return generic_setlease(file, arg, lease, priv);
873 else if (tlink_tcon(cfile->tlink)->local_lease &&
874 !CIFS_CACHE_READ(CIFS_I(inode)))
876 * If the server claims to support oplock on this file, then we
877 * still need to check oplock even if the local_lease mount
878 * option is set, but there are servers which do not support
879 * oplock for which this mount option may be useful if the user
880 * knows that the file won't be changed on the server by anyone
883 return generic_setlease(file, arg, lease, priv);
888 struct file_system_type cifs_fs_type = {
889 .owner = THIS_MODULE,
891 .mount = cifs_do_mount,
892 .kill_sb = cifs_kill_sb,
895 MODULE_ALIAS_FS("cifs");
896 const struct inode_operations cifs_dir_inode_ops = {
897 .create = cifs_create,
898 .atomic_open = cifs_atomic_open,
899 .lookup = cifs_lookup,
900 .getattr = cifs_getattr,
901 .unlink = cifs_unlink,
902 .link = cifs_hardlink,
905 .rename = cifs_rename2,
906 .permission = cifs_permission,
907 .setattr = cifs_setattr,
908 .symlink = cifs_symlink,
910 .listxattr = cifs_listxattr,
913 const struct inode_operations cifs_file_inode_ops = {
914 .setattr = cifs_setattr,
915 .getattr = cifs_getattr,
916 .permission = cifs_permission,
917 .listxattr = cifs_listxattr,
920 const struct inode_operations cifs_symlink_inode_ops = {
921 .get_link = cifs_get_link,
922 .permission = cifs_permission,
923 .listxattr = cifs_listxattr,
926 static int cifs_clone_file_range(struct file *src_file, loff_t off,
927 struct file *dst_file, loff_t destoff, u64 len)
929 struct inode *src_inode = file_inode(src_file);
930 struct inode *target_inode = file_inode(dst_file);
931 struct cifsFileInfo *smb_file_src = src_file->private_data;
932 struct cifsFileInfo *smb_file_target = dst_file->private_data;
933 struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
937 cifs_dbg(FYI, "clone range\n");
941 if (!src_file->private_data || !dst_file->private_data) {
943 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
948 * Note: cifs case is easier than btrfs since server responsible for
949 * checks for proper open modes and file type and if it wants
950 * server could even support copy of range where source = target
952 lock_two_nondirectories(target_inode, src_inode);
955 len = src_inode->i_size - off;
957 cifs_dbg(FYI, "about to flush pages\n");
958 /* should we flush first and last page first */
959 truncate_inode_pages_range(&target_inode->i_data, destoff,
960 PAGE_ALIGN(destoff + len)-1);
962 if (target_tcon->ses->server->ops->duplicate_extents)
963 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
964 smb_file_src, smb_file_target, off, len, destoff);
968 /* force revalidate of size and timestamps of target file now
969 that target is updated on the server */
970 CIFS_I(target_inode)->time = 0;
971 /* although unlocking in the reverse order from locking is not
972 strictly necessary here it is a little cleaner to be consistent */
973 unlock_two_nondirectories(src_inode, target_inode);
979 ssize_t cifs_file_copychunk_range(unsigned int xid,
980 struct file *src_file, loff_t off,
981 struct file *dst_file, loff_t destoff,
982 size_t len, unsigned int flags)
984 struct inode *src_inode = file_inode(src_file);
985 struct inode *target_inode = file_inode(dst_file);
986 struct cifsFileInfo *smb_file_src;
987 struct cifsFileInfo *smb_file_target;
988 struct cifs_tcon *src_tcon;
989 struct cifs_tcon *target_tcon;
992 cifs_dbg(FYI, "copychunk range\n");
994 if (src_inode == target_inode) {
999 if (!src_file->private_data || !dst_file->private_data) {
1001 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1006 smb_file_target = dst_file->private_data;
1007 smb_file_src = src_file->private_data;
1008 src_tcon = tlink_tcon(smb_file_src->tlink);
1009 target_tcon = tlink_tcon(smb_file_target->tlink);
1011 if (src_tcon->ses != target_tcon->ses) {
1012 cifs_dbg(VFS, "source and target of copy not on same server\n");
1017 * Note: cifs case is easier than btrfs since server responsible for
1018 * checks for proper open modes and file type and if it wants
1019 * server could even support copy of range where source = target
1021 lock_two_nondirectories(target_inode, src_inode);
1023 cifs_dbg(FYI, "about to flush pages\n");
1024 /* should we flush first and last page first */
1025 truncate_inode_pages(&target_inode->i_data, 0);
1027 if (target_tcon->ses->server->ops->copychunk_range)
1028 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1029 smb_file_src, smb_file_target, off, len, destoff);
1033 /* force revalidate of size and timestamps of target file now
1034 * that target is updated on the server
1036 CIFS_I(target_inode)->time = 0;
1037 /* although unlocking in the reverse order from locking is not
1038 * strictly necessary here it is a little cleaner to be consistent
1040 unlock_two_nondirectories(src_inode, target_inode);
1046 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1047 struct file *dst_file, loff_t destoff,
1048 size_t len, unsigned int flags)
1050 unsigned int xid = get_xid();
1053 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1059 const struct file_operations cifs_file_ops = {
1060 .read_iter = cifs_loose_read_iter,
1061 .write_iter = cifs_file_write_iter,
1063 .release = cifs_close,
1065 .fsync = cifs_fsync,
1066 .flush = cifs_flush,
1067 .mmap = cifs_file_mmap,
1068 .splice_read = generic_file_splice_read,
1069 .llseek = cifs_llseek,
1070 .unlocked_ioctl = cifs_ioctl,
1071 .copy_file_range = cifs_copy_file_range,
1072 .clone_file_range = cifs_clone_file_range,
1073 .setlease = cifs_setlease,
1074 .fallocate = cifs_fallocate,
1077 const struct file_operations cifs_file_strict_ops = {
1078 .read_iter = cifs_strict_readv,
1079 .write_iter = cifs_strict_writev,
1081 .release = cifs_close,
1083 .fsync = cifs_strict_fsync,
1084 .flush = cifs_flush,
1085 .mmap = cifs_file_strict_mmap,
1086 .splice_read = generic_file_splice_read,
1087 .llseek = cifs_llseek,
1088 .unlocked_ioctl = cifs_ioctl,
1089 .copy_file_range = cifs_copy_file_range,
1090 .clone_file_range = cifs_clone_file_range,
1091 .setlease = cifs_setlease,
1092 .fallocate = cifs_fallocate,
1095 const struct file_operations cifs_file_direct_ops = {
1096 /* BB reevaluate whether they can be done with directio, no cache */
1097 .read_iter = cifs_user_readv,
1098 .write_iter = cifs_user_writev,
1100 .release = cifs_close,
1102 .fsync = cifs_fsync,
1103 .flush = cifs_flush,
1104 .mmap = cifs_file_mmap,
1105 .splice_read = generic_file_splice_read,
1106 .unlocked_ioctl = cifs_ioctl,
1107 .copy_file_range = cifs_copy_file_range,
1108 .clone_file_range = cifs_clone_file_range,
1109 .llseek = cifs_llseek,
1110 .setlease = cifs_setlease,
1111 .fallocate = cifs_fallocate,
1114 const struct file_operations cifs_file_nobrl_ops = {
1115 .read_iter = cifs_loose_read_iter,
1116 .write_iter = cifs_file_write_iter,
1118 .release = cifs_close,
1119 .fsync = cifs_fsync,
1120 .flush = cifs_flush,
1121 .mmap = cifs_file_mmap,
1122 .splice_read = generic_file_splice_read,
1123 .llseek = cifs_llseek,
1124 .unlocked_ioctl = cifs_ioctl,
1125 .copy_file_range = cifs_copy_file_range,
1126 .clone_file_range = cifs_clone_file_range,
1127 .setlease = cifs_setlease,
1128 .fallocate = cifs_fallocate,
1131 const struct file_operations cifs_file_strict_nobrl_ops = {
1132 .read_iter = cifs_strict_readv,
1133 .write_iter = cifs_strict_writev,
1135 .release = cifs_close,
1136 .fsync = cifs_strict_fsync,
1137 .flush = cifs_flush,
1138 .mmap = cifs_file_strict_mmap,
1139 .splice_read = generic_file_splice_read,
1140 .llseek = cifs_llseek,
1141 .unlocked_ioctl = cifs_ioctl,
1142 .copy_file_range = cifs_copy_file_range,
1143 .clone_file_range = cifs_clone_file_range,
1144 .setlease = cifs_setlease,
1145 .fallocate = cifs_fallocate,
1148 const struct file_operations cifs_file_direct_nobrl_ops = {
1149 /* BB reevaluate whether they can be done with directio, no cache */
1150 .read_iter = cifs_user_readv,
1151 .write_iter = cifs_user_writev,
1153 .release = cifs_close,
1154 .fsync = cifs_fsync,
1155 .flush = cifs_flush,
1156 .mmap = cifs_file_mmap,
1157 .splice_read = generic_file_splice_read,
1158 .unlocked_ioctl = cifs_ioctl,
1159 .copy_file_range = cifs_copy_file_range,
1160 .clone_file_range = cifs_clone_file_range,
1161 .llseek = cifs_llseek,
1162 .setlease = cifs_setlease,
1163 .fallocate = cifs_fallocate,
1166 const struct file_operations cifs_dir_ops = {
1167 .iterate_shared = cifs_readdir,
1168 .release = cifs_closedir,
1169 .read = generic_read_dir,
1170 .unlocked_ioctl = cifs_ioctl,
1171 .copy_file_range = cifs_copy_file_range,
1172 .clone_file_range = cifs_clone_file_range,
1173 .llseek = generic_file_llseek,
1177 cifs_init_once(void *inode)
1179 struct cifsInodeInfo *cifsi = inode;
1181 inode_init_once(&cifsi->vfs_inode);
1182 init_rwsem(&cifsi->lock_sem);
1186 cifs_init_inodecache(void)
1188 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1189 sizeof(struct cifsInodeInfo),
1190 0, (SLAB_RECLAIM_ACCOUNT|
1191 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1193 if (cifs_inode_cachep == NULL)
1200 cifs_destroy_inodecache(void)
1203 * Make sure all delayed rcu free inodes are flushed before we
1207 kmem_cache_destroy(cifs_inode_cachep);
1211 cifs_init_request_bufs(void)
1214 * SMB2 maximum header size is bigger than CIFS one - no problems to
1215 * allocate some more bytes for CIFS.
1217 size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1219 if (CIFSMaxBufSize < 8192) {
1220 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1221 Unicode path name has to fit in any SMB/CIFS path based frames */
1222 CIFSMaxBufSize = 8192;
1223 } else if (CIFSMaxBufSize > 1024*127) {
1224 CIFSMaxBufSize = 1024 * 127;
1226 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1229 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1230 CIFSMaxBufSize, CIFSMaxBufSize);
1232 cifs_req_cachep = kmem_cache_create("cifs_request",
1233 CIFSMaxBufSize + max_hdr_size, 0,
1234 SLAB_HWCACHE_ALIGN, NULL);
1235 if (cifs_req_cachep == NULL)
1238 if (cifs_min_rcv < 1)
1240 else if (cifs_min_rcv > 64) {
1242 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1245 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1248 if (cifs_req_poolp == NULL) {
1249 kmem_cache_destroy(cifs_req_cachep);
1252 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1253 almost all handle based requests (but not write response, nor is it
1254 sufficient for path based requests). A smaller size would have
1255 been more efficient (compacting multiple slab items on one 4k page)
1256 for the case in which debug was on, but this larger size allows
1257 more SMBs to use small buffer alloc and is still much more
1258 efficient to alloc 1 per page off the slab compared to 17K (5page)
1259 alloc of large cifs buffers even when page debugging is on */
1260 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1261 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1263 if (cifs_sm_req_cachep == NULL) {
1264 mempool_destroy(cifs_req_poolp);
1265 kmem_cache_destroy(cifs_req_cachep);
1269 if (cifs_min_small < 2)
1271 else if (cifs_min_small > 256) {
1272 cifs_min_small = 256;
1273 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1276 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1277 cifs_sm_req_cachep);
1279 if (cifs_sm_req_poolp == NULL) {
1280 mempool_destroy(cifs_req_poolp);
1281 kmem_cache_destroy(cifs_req_cachep);
1282 kmem_cache_destroy(cifs_sm_req_cachep);
1290 cifs_destroy_request_bufs(void)
1292 mempool_destroy(cifs_req_poolp);
1293 kmem_cache_destroy(cifs_req_cachep);
1294 mempool_destroy(cifs_sm_req_poolp);
1295 kmem_cache_destroy(cifs_sm_req_cachep);
1299 cifs_init_mids(void)
1301 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1302 sizeof(struct mid_q_entry), 0,
1303 SLAB_HWCACHE_ALIGN, NULL);
1304 if (cifs_mid_cachep == NULL)
1307 /* 3 is a reasonable minimum number of simultaneous operations */
1308 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1309 if (cifs_mid_poolp == NULL) {
1310 kmem_cache_destroy(cifs_mid_cachep);
1318 cifs_destroy_mids(void)
1320 mempool_destroy(cifs_mid_poolp);
1321 kmem_cache_destroy(cifs_mid_cachep);
1329 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1330 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1331 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1332 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1333 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1335 * Initialize Global counters
1337 atomic_set(&sesInfoAllocCount, 0);
1338 atomic_set(&tconInfoAllocCount, 0);
1339 atomic_set(&tcpSesAllocCount, 0);
1340 atomic_set(&tcpSesReconnectCount, 0);
1341 atomic_set(&tconInfoReconnectCount, 0);
1343 atomic_set(&bufAllocCount, 0);
1344 atomic_set(&smBufAllocCount, 0);
1345 #ifdef CONFIG_CIFS_STATS2
1346 atomic_set(&totBufAllocCount, 0);
1347 atomic_set(&totSmBufAllocCount, 0);
1348 #endif /* CONFIG_CIFS_STATS2 */
1350 atomic_set(&midCount, 0);
1351 GlobalCurrentXid = 0;
1352 GlobalTotalActiveXid = 0;
1353 GlobalMaxActiveXid = 0;
1354 spin_lock_init(&cifs_tcp_ses_lock);
1355 spin_lock_init(&GlobalMid_Lock);
1357 cifs_lock_secret = get_random_u32();
1359 if (cifs_max_pending < 2) {
1360 cifs_max_pending = 2;
1361 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1362 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1363 cifs_max_pending = CIFS_MAX_REQ;
1364 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1368 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1371 goto out_clean_proc;
1374 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1375 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1376 if (!cifsoplockd_wq) {
1378 goto out_destroy_cifsiod_wq;
1381 rc = cifs_fscache_register();
1383 goto out_destroy_cifsoplockd_wq;
1385 rc = cifs_init_inodecache();
1387 goto out_unreg_fscache;
1389 rc = cifs_init_mids();
1391 goto out_destroy_inodecache;
1393 rc = cifs_init_request_bufs();
1395 goto out_destroy_mids;
1397 #ifdef CONFIG_CIFS_UPCALL
1398 rc = init_cifs_spnego();
1400 goto out_destroy_request_bufs;
1401 #endif /* CONFIG_CIFS_UPCALL */
1403 #ifdef CONFIG_CIFS_ACL
1404 rc = init_cifs_idmap();
1406 goto out_register_key_type;
1407 #endif /* CONFIG_CIFS_ACL */
1409 rc = register_filesystem(&cifs_fs_type);
1411 goto out_init_cifs_idmap;
1415 out_init_cifs_idmap:
1416 #ifdef CONFIG_CIFS_ACL
1418 out_register_key_type:
1420 #ifdef CONFIG_CIFS_UPCALL
1422 out_destroy_request_bufs:
1424 cifs_destroy_request_bufs();
1426 cifs_destroy_mids();
1427 out_destroy_inodecache:
1428 cifs_destroy_inodecache();
1430 cifs_fscache_unregister();
1431 out_destroy_cifsoplockd_wq:
1432 destroy_workqueue(cifsoplockd_wq);
1433 out_destroy_cifsiod_wq:
1434 destroy_workqueue(cifsiod_wq);
1443 cifs_dbg(NOISY, "exit_cifs\n");
1444 unregister_filesystem(&cifs_fs_type);
1445 cifs_dfs_release_automount_timer();
1446 #ifdef CONFIG_CIFS_ACL
1449 #ifdef CONFIG_CIFS_UPCALL
1450 unregister_key_type(&cifs_spnego_key_type);
1452 cifs_destroy_request_bufs();
1453 cifs_destroy_mids();
1454 cifs_destroy_inodecache();
1455 cifs_fscache_unregister();
1456 destroy_workqueue(cifsoplockd_wq);
1457 destroy_workqueue(cifsiod_wq);
1462 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1464 ("VFS to access servers complying with the SNIA CIFS Specification "
1465 "e.g. Samba and Windows");
1466 MODULE_VERSION(CIFS_VERSION);
1467 MODULE_SOFTDEP("pre: arc4");
1468 MODULE_SOFTDEP("pre: des");
1469 MODULE_SOFTDEP("pre: ecb");
1470 MODULE_SOFTDEP("pre: hmac");
1471 MODULE_SOFTDEP("pre: md4");
1472 MODULE_SOFTDEP("pre: md5");
1473 MODULE_SOFTDEP("pre: nls");
1474 MODULE_SOFTDEP("pre: aes");
1475 MODULE_SOFTDEP("pre: cmac");
1476 MODULE_SOFTDEP("pre: sha256");
1477 MODULE_SOFTDEP("pre: aead2");
1478 MODULE_SOFTDEP("pre: ccm");
1479 module_init(init_cifs)
1480 module_exit(exit_cifs)