4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Common Internet FileSystem (CIFS) client
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 /* Note that BB means BUGBUG (ie something to fix eventually) */
26 #include <linux/module.h>
28 #include <linux/mount.h>
29 #include <linux/slab.h>
30 #include <linux/init.h>
31 #include <linux/list.h>
32 #include <linux/seq_file.h>
33 #include <linux/vfs.h>
34 #include <linux/mempool.h>
35 #include <linux/delay.h>
36 #include <linux/kthread.h>
37 #include <linux/freezer.h>
38 #include <linux/namei.h>
39 #include <linux/random.h>
43 #define DECLARE_GLOBALS_HERE
45 #include "cifsproto.h"
46 #include "cifs_debug.h"
47 #include "cifs_fs_sb.h"
49 #include <linux/key-type.h>
50 #include "cifs_spnego.h"
52 #ifdef CONFIG_CIFS_SMB2
58 bool enable_oplocks = true;
59 unsigned int linuxExtEnabled = 1;
60 unsigned int lookupCacheEnabled = 1;
61 unsigned int global_secflags = CIFSSEC_DEF;
62 /* unsigned int ntlmv2_support = 0; */
63 unsigned int sign_CIFS_PDUs = 1;
64 static const struct super_operations cifs_super_ops;
65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
66 module_param(CIFSMaxBufSize, uint, 0);
67 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
68 "Default: 16384 Range: 8192 to 130048");
69 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
70 module_param(cifs_min_rcv, uint, 0);
71 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
73 unsigned int cifs_min_small = 30;
74 module_param(cifs_min_small, uint, 0);
75 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
77 unsigned int cifs_max_pending = CIFS_MAX_REQ;
78 module_param(cifs_max_pending, uint, 0444);
79 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
80 "Default: 32767 Range: 2 to 32767.");
81 module_param(enable_oplocks, bool, 0644);
82 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
84 extern mempool_t *cifs_sm_req_poolp;
85 extern mempool_t *cifs_req_poolp;
86 extern mempool_t *cifs_mid_poolp;
88 struct workqueue_struct *cifsiod_wq;
90 #ifdef CONFIG_CIFS_SMB2
91 __u8 cifs_client_guid[SMB2_CLIENT_GUID_SIZE];
95 * Bumps refcount for cifs super block.
96 * Note that it should be only called if a referece to VFS super block is
97 * already held, e.g. in open-type syscalls context. Otherwise it can race with
98 * atomic_dec_and_test in deactivate_locked_super.
101 cifs_sb_active(struct super_block *sb)
103 struct cifs_sb_info *server = CIFS_SB(sb);
105 if (atomic_inc_return(&server->active) == 1)
106 atomic_inc(&sb->s_active);
110 cifs_sb_deactive(struct super_block *sb)
112 struct cifs_sb_info *server = CIFS_SB(sb);
114 if (atomic_dec_and_test(&server->active))
115 deactivate_super(sb);
119 cifs_read_super(struct super_block *sb)
122 struct cifs_sb_info *cifs_sb;
123 struct cifs_tcon *tcon;
126 cifs_sb = CIFS_SB(sb);
127 tcon = cifs_sb_master_tcon(cifs_sb);
129 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
130 sb->s_flags |= MS_POSIXACL;
132 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
133 sb->s_maxbytes = MAX_LFS_FILESIZE;
135 sb->s_maxbytes = MAX_NON_LFS;
137 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
138 sb->s_time_gran = 100;
140 sb->s_magic = CIFS_MAGIC_NUMBER;
141 sb->s_op = &cifs_super_ops;
142 sb->s_bdi = &cifs_sb->bdi;
143 sb->s_blocksize = CIFS_MAX_MSGSIZE;
144 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
145 inode = cifs_root_iget(sb);
153 sb->s_d_op = &cifs_ci_dentry_ops;
155 sb->s_d_op = &cifs_dentry_ops;
157 sb->s_root = d_make_root(inode);
163 #ifdef CONFIG_CIFS_NFSD_EXPORT
164 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
165 cifs_dbg(FYI, "export ops supported\n");
166 sb->s_export_op = &cifs_export_ops;
168 #endif /* CONFIG_CIFS_NFSD_EXPORT */
173 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
177 static void cifs_kill_sb(struct super_block *sb)
179 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
181 cifs_umount(cifs_sb);
185 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
187 struct super_block *sb = dentry->d_sb;
188 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
189 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
190 struct TCP_Server_Info *server = tcon->ses->server;
197 * PATH_MAX may be too long - it would presumably be total path,
198 * but note that some servers (includinng Samba 3) have a shorter
201 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
203 buf->f_namelen = PATH_MAX;
204 buf->f_files = 0; /* undefined */
205 buf->f_ffree = 0; /* unlimited */
207 if (server->ops->queryfs)
208 rc = server->ops->queryfs(xid, tcon, buf);
214 static int cifs_permission(struct inode *inode, int mask)
216 struct cifs_sb_info *cifs_sb;
218 cifs_sb = CIFS_SB(inode->i_sb);
220 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
221 if ((mask & MAY_EXEC) && !execute_ok(inode))
225 } else /* file mode might have been restricted at mount time
226 on the client (above and beyond ACL on servers) for
227 servers which do not support setting and viewing mode bits,
228 so allowing client to check permissions is useful */
229 return generic_permission(inode, mask);
232 static struct kmem_cache *cifs_inode_cachep;
233 static struct kmem_cache *cifs_req_cachep;
234 static struct kmem_cache *cifs_mid_cachep;
235 static struct kmem_cache *cifs_sm_req_cachep;
236 mempool_t *cifs_sm_req_poolp;
237 mempool_t *cifs_req_poolp;
238 mempool_t *cifs_mid_poolp;
240 static struct inode *
241 cifs_alloc_inode(struct super_block *sb)
243 struct cifsInodeInfo *cifs_inode;
244 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
247 cifs_inode->cifsAttrs = 0x20; /* default */
248 cifs_inode->time = 0;
250 * Until the file is open and we have gotten oplock info back from the
251 * server, can not assume caching of file data or metadata.
253 cifs_set_oplock_level(cifs_inode, 0);
254 cifs_inode->delete_pending = false;
255 cifs_inode->invalid_mapping = false;
256 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cifs_inode->flags);
257 clear_bit(CIFS_INODE_PENDING_WRITERS, &cifs_inode->flags);
258 clear_bit(CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, &cifs_inode->flags);
259 spin_lock_init(&cifs_inode->writers_lock);
260 cifs_inode->writers = 0;
261 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
262 cifs_inode->server_eof = 0;
263 cifs_inode->uniqueid = 0;
264 cifs_inode->createtime = 0;
265 cifs_inode->epoch = 0;
266 #ifdef CONFIG_CIFS_SMB2
267 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
270 * Can not set i_flags here - they get immediately overwritten to zero
273 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
274 INIT_LIST_HEAD(&cifs_inode->openFileList);
275 INIT_LIST_HEAD(&cifs_inode->llist);
276 return &cifs_inode->vfs_inode;
279 static void cifs_i_callback(struct rcu_head *head)
281 struct inode *inode = container_of(head, struct inode, i_rcu);
282 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
286 cifs_destroy_inode(struct inode *inode)
288 call_rcu(&inode->i_rcu, cifs_i_callback);
292 cifs_evict_inode(struct inode *inode)
294 truncate_inode_pages_final(&inode->i_data);
296 cifs_fscache_release_inode_cookie(inode);
300 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
302 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
303 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
305 seq_printf(s, ",addr=");
307 switch (server->dstaddr.ss_family) {
309 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
312 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
313 if (sa6->sin6_scope_id)
314 seq_printf(s, "%%%u", sa6->sin6_scope_id);
317 seq_printf(s, "(unknown)");
322 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
324 if (ses->sectype == Unspecified)
327 seq_printf(s, ",sec=");
329 switch (ses->sectype) {
331 seq_printf(s, "lanman");
334 seq_printf(s, "ntlmv2");
337 seq_printf(s, "ntlm");
340 seq_printf(s, "krb5");
343 seq_printf(s, "ntlmssp");
346 /* shouldn't ever happen */
347 seq_printf(s, "unknown");
356 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
358 seq_printf(s, ",cache=");
360 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
361 seq_printf(s, "strict");
362 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
363 seq_printf(s, "none");
365 seq_printf(s, "loose");
369 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
371 struct nls_table *def;
373 /* Display iocharset= option if it's not default charset */
374 def = load_nls_default();
376 seq_printf(s, ",iocharset=%s", cur->charset);
381 * cifs_show_options() is for displaying mount options in /proc/mounts.
382 * Not all settable options are displayed but most of the important
386 cifs_show_options(struct seq_file *s, struct dentry *root)
388 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
389 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
390 struct sockaddr *srcaddr;
391 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
393 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
394 cifs_show_security(s, tcon->ses);
395 cifs_show_cache_flavor(s, cifs_sb);
397 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
398 seq_printf(s, ",multiuser");
399 else if (tcon->ses->user_name)
400 seq_printf(s, ",username=%s", tcon->ses->user_name);
402 if (tcon->ses->domainName)
403 seq_printf(s, ",domain=%s", tcon->ses->domainName);
405 if (srcaddr->sa_family != AF_UNSPEC) {
406 struct sockaddr_in *saddr4;
407 struct sockaddr_in6 *saddr6;
408 saddr4 = (struct sockaddr_in *)srcaddr;
409 saddr6 = (struct sockaddr_in6 *)srcaddr;
410 if (srcaddr->sa_family == AF_INET6)
411 seq_printf(s, ",srcaddr=%pI6c",
413 else if (srcaddr->sa_family == AF_INET)
414 seq_printf(s, ",srcaddr=%pI4",
415 &saddr4->sin_addr.s_addr);
417 seq_printf(s, ",srcaddr=BAD-AF:%i",
418 (int)(srcaddr->sa_family));
421 seq_printf(s, ",uid=%u",
422 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
423 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
424 seq_printf(s, ",forceuid");
426 seq_printf(s, ",noforceuid");
428 seq_printf(s, ",gid=%u",
429 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
430 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
431 seq_printf(s, ",forcegid");
433 seq_printf(s, ",noforcegid");
435 cifs_show_address(s, tcon->ses->server);
438 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
439 cifs_sb->mnt_file_mode,
440 cifs_sb->mnt_dir_mode);
442 cifs_show_nls(s, cifs_sb->local_nls);
445 seq_printf(s, ",seal");
447 seq_printf(s, ",nocase");
449 seq_printf(s, ",hard");
451 seq_printf(s, ",unix");
453 seq_printf(s, ",nounix");
454 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
455 seq_printf(s, ",posixpaths");
456 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
457 seq_printf(s, ",setuids");
458 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
459 seq_printf(s, ",serverino");
460 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
461 seq_printf(s, ",rwpidforward");
462 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
463 seq_printf(s, ",forcemand");
464 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
465 seq_printf(s, ",nouser_xattr");
466 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
467 seq_printf(s, ",mapchars");
468 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
469 seq_printf(s, ",sfu");
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
471 seq_printf(s, ",nobrl");
472 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
473 seq_printf(s, ",cifsacl");
474 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
475 seq_printf(s, ",dynperm");
476 if (root->d_sb->s_flags & MS_POSIXACL)
477 seq_printf(s, ",acl");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
479 seq_printf(s, ",mfsymlinks");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
481 seq_printf(s, ",fsc");
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
483 seq_printf(s, ",nostrictsync");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
485 seq_printf(s, ",noperm");
486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
487 seq_printf(s, ",backupuid=%u",
488 from_kuid_munged(&init_user_ns,
489 cifs_sb->mnt_backupuid));
490 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
491 seq_printf(s, ",backupgid=%u",
492 from_kgid_munged(&init_user_ns,
493 cifs_sb->mnt_backupgid));
495 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
496 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
497 /* convert actimeo and display it in seconds */
498 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
503 static void cifs_umount_begin(struct super_block *sb)
505 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
506 struct cifs_tcon *tcon;
511 tcon = cifs_sb_master_tcon(cifs_sb);
513 spin_lock(&cifs_tcp_ses_lock);
514 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
515 /* we have other mounts to same share or we have
516 already tried to force umount this and woken up
517 all waiting network requests, nothing to do */
518 spin_unlock(&cifs_tcp_ses_lock);
520 } else if (tcon->tc_count == 1)
521 tcon->tidStatus = CifsExiting;
522 spin_unlock(&cifs_tcp_ses_lock);
524 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
525 /* cancel_notify_requests(tcon); */
526 if (tcon->ses && tcon->ses->server) {
527 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
528 wake_up_all(&tcon->ses->server->request_q);
529 wake_up_all(&tcon->ses->server->response_q);
530 msleep(1); /* yield */
531 /* we have to kick the requests once more */
532 wake_up_all(&tcon->ses->server->response_q);
539 #ifdef CONFIG_CIFS_STATS2
540 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
547 static int cifs_remount(struct super_block *sb, int *flags, char *data)
550 *flags |= MS_NODIRATIME;
554 static int cifs_drop_inode(struct inode *inode)
556 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
558 /* no serverino => unconditional eviction */
559 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
560 generic_drop_inode(inode);
563 static const struct super_operations cifs_super_ops = {
564 .statfs = cifs_statfs,
565 .alloc_inode = cifs_alloc_inode,
566 .destroy_inode = cifs_destroy_inode,
567 .drop_inode = cifs_drop_inode,
568 .evict_inode = cifs_evict_inode,
569 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
570 function unless later we add lazy close of inodes or unless the
571 kernel forgets to call us with the same number of releases (closes)
573 .show_options = cifs_show_options,
574 .umount_begin = cifs_umount_begin,
575 .remount_fs = cifs_remount,
576 #ifdef CONFIG_CIFS_STATS2
577 .show_stats = cifs_show_stats,
582 * Get root dentry from superblock according to prefix path mount option.
583 * Return dentry with refcount + 1 on success and NULL otherwise.
585 static struct dentry *
586 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
588 struct dentry *dentry;
589 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
590 char *full_path = NULL;
594 full_path = cifs_build_path_to_root(vol, cifs_sb,
595 cifs_sb_master_tcon(cifs_sb));
596 if (full_path == NULL)
597 return ERR_PTR(-ENOMEM);
599 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
601 sep = CIFS_DIR_SEP(cifs_sb);
602 dentry = dget(sb->s_root);
606 struct inode *dir = dentry->d_inode;
607 struct dentry *child;
611 dentry = ERR_PTR(-ENOENT);
614 if (!S_ISDIR(dir->i_mode)) {
616 dentry = ERR_PTR(-ENOTDIR);
620 /* skip separators */
627 while (*s && *s != sep)
630 mutex_lock(&dir->i_mutex);
631 child = lookup_one_len(p, dentry, s - p);
632 mutex_unlock(&dir->i_mutex);
635 } while (!IS_ERR(dentry));
640 static int cifs_set_super(struct super_block *sb, void *data)
642 struct cifs_mnt_data *mnt_data = data;
643 sb->s_fs_info = mnt_data->cifs_sb;
644 return set_anon_super(sb, NULL);
647 static struct dentry *
648 cifs_do_mount(struct file_system_type *fs_type,
649 int flags, const char *dev_name, void *data)
652 struct super_block *sb;
653 struct cifs_sb_info *cifs_sb;
654 struct smb_vol *volume_info;
655 struct cifs_mnt_data mnt_data;
658 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
660 volume_info = cifs_get_volume_info((char *)data, dev_name);
661 if (IS_ERR(volume_info))
662 return ERR_CAST(volume_info);
664 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
665 if (cifs_sb == NULL) {
666 root = ERR_PTR(-ENOMEM);
670 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
671 if (cifs_sb->mountdata == NULL) {
672 root = ERR_PTR(-ENOMEM);
676 cifs_setup_cifs_sb(volume_info, cifs_sb);
678 rc = cifs_mount(cifs_sb, volume_info);
680 if (!(flags & MS_SILENT))
681 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
687 mnt_data.vol = volume_info;
688 mnt_data.cifs_sb = cifs_sb;
689 mnt_data.flags = flags;
691 /* BB should we make this contingent on mount parm? */
692 flags |= MS_NODIRATIME | MS_NOATIME;
694 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
697 cifs_umount(cifs_sb);
702 cifs_dbg(FYI, "Use existing superblock\n");
703 cifs_umount(cifs_sb);
705 rc = cifs_read_super(sb);
711 sb->s_flags |= MS_ACTIVE;
714 root = cifs_get_root(volume_info, sb);
718 cifs_dbg(FYI, "dentry root is: %p\n", root);
722 deactivate_locked_super(sb);
724 cifs_cleanup_volume_info(volume_info);
728 kfree(cifs_sb->mountdata);
732 unload_nls(volume_info->local_nls);
736 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
737 unsigned long nr_segs, loff_t pos)
739 struct inode *inode = file_inode(iocb->ki_filp);
740 struct cifsInodeInfo *cinode = CIFS_I(inode);
744 written = cifs_get_writer(cinode);
748 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
750 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
753 rc = filemap_fdatawrite(inode->i_mapping);
755 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
759 cifs_put_writer(cinode);
763 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
766 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
767 * the cached file length
769 if (whence != SEEK_SET && whence != SEEK_CUR) {
771 struct inode *inode = file_inode(file);
774 * We need to be sure that all dirty pages are written and the
775 * server has the newest file length.
777 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
778 inode->i_mapping->nrpages != 0) {
779 rc = filemap_fdatawait(inode->i_mapping);
781 mapping_set_error(inode->i_mapping, rc);
786 * Some applications poll for the file length in this strange
787 * way so we must seek to end on non-oplocked files by
788 * setting the revalidate time to zero.
790 CIFS_I(inode)->time = 0;
792 rc = cifs_revalidate_file_attr(file);
796 return generic_file_llseek(file, offset, whence);
799 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
802 * Note that this is called by vfs setlease with i_lock held to
803 * protect *lease from going away.
805 struct inode *inode = file_inode(file);
806 struct cifsFileInfo *cfile = file->private_data;
808 if (!(S_ISREG(inode->i_mode)))
811 /* check if file is oplocked */
812 if (((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
813 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
814 return generic_setlease(file, arg, lease);
815 else if (tlink_tcon(cfile->tlink)->local_lease &&
816 !CIFS_CACHE_READ(CIFS_I(inode)))
818 * If the server claims to support oplock on this file, then we
819 * still need to check oplock even if the local_lease mount
820 * option is set, but there are servers which do not support
821 * oplock for which this mount option may be useful if the user
822 * knows that the file won't be changed on the server by anyone
825 return generic_setlease(file, arg, lease);
830 struct file_system_type cifs_fs_type = {
831 .owner = THIS_MODULE,
833 .mount = cifs_do_mount,
834 .kill_sb = cifs_kill_sb,
837 MODULE_ALIAS_FS("cifs");
838 const struct inode_operations cifs_dir_inode_ops = {
839 .create = cifs_create,
840 .atomic_open = cifs_atomic_open,
841 .lookup = cifs_lookup,
842 .getattr = cifs_getattr,
843 .unlink = cifs_unlink,
844 .link = cifs_hardlink,
847 .rename = cifs_rename,
848 .permission = cifs_permission,
849 /* revalidate:cifs_revalidate, */
850 .setattr = cifs_setattr,
851 .symlink = cifs_symlink,
853 #ifdef CONFIG_CIFS_XATTR
854 .setxattr = cifs_setxattr,
855 .getxattr = cifs_getxattr,
856 .listxattr = cifs_listxattr,
857 .removexattr = cifs_removexattr,
861 const struct inode_operations cifs_file_inode_ops = {
862 /* revalidate:cifs_revalidate, */
863 .setattr = cifs_setattr,
864 .getattr = cifs_getattr, /* do we need this anymore? */
865 .permission = cifs_permission,
866 #ifdef CONFIG_CIFS_XATTR
867 .setxattr = cifs_setxattr,
868 .getxattr = cifs_getxattr,
869 .listxattr = cifs_listxattr,
870 .removexattr = cifs_removexattr,
874 const struct inode_operations cifs_symlink_inode_ops = {
875 .readlink = generic_readlink,
876 .follow_link = cifs_follow_link,
877 .put_link = kfree_put_link,
878 .permission = cifs_permission,
879 /* BB add the following two eventually */
880 /* revalidate: cifs_revalidate,
881 setattr: cifs_notify_change, *//* BB do we need notify change */
882 #ifdef CONFIG_CIFS_XATTR
883 .setxattr = cifs_setxattr,
884 .getxattr = cifs_getxattr,
885 .listxattr = cifs_listxattr,
886 .removexattr = cifs_removexattr,
890 const struct file_operations cifs_file_ops = {
891 .read = do_sync_read,
892 .write = do_sync_write,
893 .aio_read = generic_file_aio_read,
894 .aio_write = cifs_file_aio_write,
896 .release = cifs_close,
900 .mmap = cifs_file_mmap,
901 .splice_read = generic_file_splice_read,
902 .llseek = cifs_llseek,
903 #ifdef CONFIG_CIFS_POSIX
904 .unlocked_ioctl = cifs_ioctl,
905 #endif /* CONFIG_CIFS_POSIX */
906 .setlease = cifs_setlease,
909 const struct file_operations cifs_file_strict_ops = {
910 .read = do_sync_read,
911 .write = do_sync_write,
912 .aio_read = cifs_strict_readv,
913 .aio_write = cifs_strict_writev,
915 .release = cifs_close,
917 .fsync = cifs_strict_fsync,
919 .mmap = cifs_file_strict_mmap,
920 .splice_read = generic_file_splice_read,
921 .llseek = cifs_llseek,
922 #ifdef CONFIG_CIFS_POSIX
923 .unlocked_ioctl = cifs_ioctl,
924 #endif /* CONFIG_CIFS_POSIX */
925 .setlease = cifs_setlease,
928 const struct file_operations cifs_file_direct_ops = {
929 /* BB reevaluate whether they can be done with directio, no cache */
930 .read = do_sync_read,
931 .write = do_sync_write,
932 .aio_read = cifs_user_readv,
933 .aio_write = cifs_user_writev,
935 .release = cifs_close,
939 .mmap = cifs_file_mmap,
940 .splice_read = generic_file_splice_read,
941 #ifdef CONFIG_CIFS_POSIX
942 .unlocked_ioctl = cifs_ioctl,
943 #endif /* CONFIG_CIFS_POSIX */
944 .llseek = cifs_llseek,
945 .setlease = cifs_setlease,
948 const struct file_operations cifs_file_nobrl_ops = {
949 .read = do_sync_read,
950 .write = do_sync_write,
951 .aio_read = generic_file_aio_read,
952 .aio_write = cifs_file_aio_write,
954 .release = cifs_close,
957 .mmap = cifs_file_mmap,
958 .splice_read = generic_file_splice_read,
959 .llseek = cifs_llseek,
960 #ifdef CONFIG_CIFS_POSIX
961 .unlocked_ioctl = cifs_ioctl,
962 #endif /* CONFIG_CIFS_POSIX */
963 .setlease = cifs_setlease,
966 const struct file_operations cifs_file_strict_nobrl_ops = {
967 .read = do_sync_read,
968 .write = do_sync_write,
969 .aio_read = cifs_strict_readv,
970 .aio_write = cifs_strict_writev,
972 .release = cifs_close,
973 .fsync = cifs_strict_fsync,
975 .mmap = cifs_file_strict_mmap,
976 .splice_read = generic_file_splice_read,
977 .llseek = cifs_llseek,
978 #ifdef CONFIG_CIFS_POSIX
979 .unlocked_ioctl = cifs_ioctl,
980 #endif /* CONFIG_CIFS_POSIX */
981 .setlease = cifs_setlease,
984 const struct file_operations cifs_file_direct_nobrl_ops = {
985 /* BB reevaluate whether they can be done with directio, no cache */
986 .read = do_sync_read,
987 .write = do_sync_write,
988 .aio_read = cifs_user_readv,
989 .aio_write = cifs_user_writev,
991 .release = cifs_close,
994 .mmap = cifs_file_mmap,
995 .splice_read = generic_file_splice_read,
996 #ifdef CONFIG_CIFS_POSIX
997 .unlocked_ioctl = cifs_ioctl,
998 #endif /* CONFIG_CIFS_POSIX */
999 .llseek = cifs_llseek,
1000 .setlease = cifs_setlease,
1003 const struct file_operations cifs_dir_ops = {
1004 .iterate = cifs_readdir,
1005 .release = cifs_closedir,
1006 .read = generic_read_dir,
1007 .unlocked_ioctl = cifs_ioctl,
1008 .llseek = generic_file_llseek,
1012 cifs_init_once(void *inode)
1014 struct cifsInodeInfo *cifsi = inode;
1016 inode_init_once(&cifsi->vfs_inode);
1017 init_rwsem(&cifsi->lock_sem);
1021 cifs_init_inodecache(void)
1023 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1024 sizeof(struct cifsInodeInfo),
1025 0, (SLAB_RECLAIM_ACCOUNT|
1028 if (cifs_inode_cachep == NULL)
1035 cifs_destroy_inodecache(void)
1038 * Make sure all delayed rcu free inodes are flushed before we
1042 kmem_cache_destroy(cifs_inode_cachep);
1046 cifs_init_request_bufs(void)
1048 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1049 #ifdef CONFIG_CIFS_SMB2
1051 * SMB2 maximum header size is bigger than CIFS one - no problems to
1052 * allocate some more bytes for CIFS.
1054 max_hdr_size = MAX_SMB2_HDR_SIZE;
1056 if (CIFSMaxBufSize < 8192) {
1057 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1058 Unicode path name has to fit in any SMB/CIFS path based frames */
1059 CIFSMaxBufSize = 8192;
1060 } else if (CIFSMaxBufSize > 1024*127) {
1061 CIFSMaxBufSize = 1024 * 127;
1063 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1066 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1067 CIFSMaxBufSize, CIFSMaxBufSize);
1069 cifs_req_cachep = kmem_cache_create("cifs_request",
1070 CIFSMaxBufSize + max_hdr_size, 0,
1071 SLAB_HWCACHE_ALIGN, NULL);
1072 if (cifs_req_cachep == NULL)
1075 if (cifs_min_rcv < 1)
1077 else if (cifs_min_rcv > 64) {
1079 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1082 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1085 if (cifs_req_poolp == NULL) {
1086 kmem_cache_destroy(cifs_req_cachep);
1089 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1090 almost all handle based requests (but not write response, nor is it
1091 sufficient for path based requests). A smaller size would have
1092 been more efficient (compacting multiple slab items on one 4k page)
1093 for the case in which debug was on, but this larger size allows
1094 more SMBs to use small buffer alloc and is still much more
1095 efficient to alloc 1 per page off the slab compared to 17K (5page)
1096 alloc of large cifs buffers even when page debugging is on */
1097 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1098 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1100 if (cifs_sm_req_cachep == NULL) {
1101 mempool_destroy(cifs_req_poolp);
1102 kmem_cache_destroy(cifs_req_cachep);
1106 if (cifs_min_small < 2)
1108 else if (cifs_min_small > 256) {
1109 cifs_min_small = 256;
1110 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1113 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1114 cifs_sm_req_cachep);
1116 if (cifs_sm_req_poolp == NULL) {
1117 mempool_destroy(cifs_req_poolp);
1118 kmem_cache_destroy(cifs_req_cachep);
1119 kmem_cache_destroy(cifs_sm_req_cachep);
1127 cifs_destroy_request_bufs(void)
1129 mempool_destroy(cifs_req_poolp);
1130 kmem_cache_destroy(cifs_req_cachep);
1131 mempool_destroy(cifs_sm_req_poolp);
1132 kmem_cache_destroy(cifs_sm_req_cachep);
1136 cifs_init_mids(void)
1138 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1139 sizeof(struct mid_q_entry), 0,
1140 SLAB_HWCACHE_ALIGN, NULL);
1141 if (cifs_mid_cachep == NULL)
1144 /* 3 is a reasonable minimum number of simultaneous operations */
1145 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1146 if (cifs_mid_poolp == NULL) {
1147 kmem_cache_destroy(cifs_mid_cachep);
1155 cifs_destroy_mids(void)
1157 mempool_destroy(cifs_mid_poolp);
1158 kmem_cache_destroy(cifs_mid_cachep);
1166 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1167 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1168 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1169 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1170 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1172 * Initialize Global counters
1174 atomic_set(&sesInfoAllocCount, 0);
1175 atomic_set(&tconInfoAllocCount, 0);
1176 atomic_set(&tcpSesAllocCount, 0);
1177 atomic_set(&tcpSesReconnectCount, 0);
1178 atomic_set(&tconInfoReconnectCount, 0);
1180 atomic_set(&bufAllocCount, 0);
1181 atomic_set(&smBufAllocCount, 0);
1182 #ifdef CONFIG_CIFS_STATS2
1183 atomic_set(&totBufAllocCount, 0);
1184 atomic_set(&totSmBufAllocCount, 0);
1185 #endif /* CONFIG_CIFS_STATS2 */
1187 atomic_set(&midCount, 0);
1188 GlobalCurrentXid = 0;
1189 GlobalTotalActiveXid = 0;
1190 GlobalMaxActiveXid = 0;
1191 spin_lock_init(&cifs_tcp_ses_lock);
1192 spin_lock_init(&cifs_file_list_lock);
1193 spin_lock_init(&GlobalMid_Lock);
1195 #ifdef CONFIG_CIFS_SMB2
1196 get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1199 if (cifs_max_pending < 2) {
1200 cifs_max_pending = 2;
1201 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1202 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1203 cifs_max_pending = CIFS_MAX_REQ;
1204 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1208 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1211 goto out_clean_proc;
1214 rc = cifs_fscache_register();
1216 goto out_destroy_wq;
1218 rc = cifs_init_inodecache();
1220 goto out_unreg_fscache;
1222 rc = cifs_init_mids();
1224 goto out_destroy_inodecache;
1226 rc = cifs_init_request_bufs();
1228 goto out_destroy_mids;
1230 #ifdef CONFIG_CIFS_UPCALL
1231 rc = register_key_type(&cifs_spnego_key_type);
1233 goto out_destroy_request_bufs;
1234 #endif /* CONFIG_CIFS_UPCALL */
1236 #ifdef CONFIG_CIFS_ACL
1237 rc = init_cifs_idmap();
1239 goto out_register_key_type;
1240 #endif /* CONFIG_CIFS_ACL */
1242 rc = register_filesystem(&cifs_fs_type);
1244 goto out_init_cifs_idmap;
1248 out_init_cifs_idmap:
1249 #ifdef CONFIG_CIFS_ACL
1251 out_register_key_type:
1253 #ifdef CONFIG_CIFS_UPCALL
1254 unregister_key_type(&cifs_spnego_key_type);
1255 out_destroy_request_bufs:
1257 cifs_destroy_request_bufs();
1259 cifs_destroy_mids();
1260 out_destroy_inodecache:
1261 cifs_destroy_inodecache();
1263 cifs_fscache_unregister();
1265 destroy_workqueue(cifsiod_wq);
1274 cifs_dbg(NOISY, "exit_cifs\n");
1275 unregister_filesystem(&cifs_fs_type);
1276 cifs_dfs_release_automount_timer();
1277 #ifdef CONFIG_CIFS_ACL
1280 #ifdef CONFIG_CIFS_UPCALL
1281 unregister_key_type(&cifs_spnego_key_type);
1283 cifs_destroy_request_bufs();
1284 cifs_destroy_mids();
1285 cifs_destroy_inodecache();
1286 cifs_fscache_unregister();
1287 destroy_workqueue(cifsiod_wq);
1291 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1292 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1294 ("VFS to access servers complying with the SNIA CIFS Specification "
1295 "e.g. Samba and Windows");
1296 MODULE_VERSION(CIFS_VERSION);
1297 module_init(init_cifs)
1298 module_exit(exit_cifs)