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;
125 cifs_sb = CIFS_SB(sb);
127 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
128 sb->s_flags |= MS_POSIXACL;
130 if (cifs_sb_master_tcon(cifs_sb)->ses->capabilities & 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_bdi = &cifs_sb->bdi;
141 sb->s_blocksize = CIFS_MAX_MSGSIZE;
142 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
143 inode = cifs_root_iget(sb);
150 sb->s_root = d_make_root(inode);
156 /* do that *after* d_make_root() - we want NULL ->d_op for root here */
157 if (cifs_sb_master_tcon(cifs_sb)->nocase)
158 sb->s_d_op = &cifs_ci_dentry_ops;
160 sb->s_d_op = &cifs_dentry_ops;
162 #ifdef CONFIG_CIFS_NFSD_EXPORT
163 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
164 cifs_dbg(FYI, "export ops supported\n");
165 sb->s_export_op = &cifs_export_ops;
167 #endif /* CONFIG_CIFS_NFSD_EXPORT */
172 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
176 static void cifs_kill_sb(struct super_block *sb)
178 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
180 cifs_umount(cifs_sb);
184 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
186 struct super_block *sb = dentry->d_sb;
187 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
188 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
189 struct TCP_Server_Info *server = tcon->ses->server;
196 * PATH_MAX may be too long - it would presumably be total path,
197 * but note that some servers (includinng Samba 3) have a shorter
200 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
202 buf->f_namelen = PATH_MAX;
203 buf->f_files = 0; /* undefined */
204 buf->f_ffree = 0; /* unlimited */
206 if (server->ops->queryfs)
207 rc = server->ops->queryfs(xid, tcon, buf);
213 static int cifs_permission(struct inode *inode, int mask)
215 struct cifs_sb_info *cifs_sb;
217 cifs_sb = CIFS_SB(inode->i_sb);
219 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
220 if ((mask & MAY_EXEC) && !execute_ok(inode))
224 } else /* file mode might have been restricted at mount time
225 on the client (above and beyond ACL on servers) for
226 servers which do not support setting and viewing mode bits,
227 so allowing client to check permissions is useful */
228 return generic_permission(inode, mask);
231 static struct kmem_cache *cifs_inode_cachep;
232 static struct kmem_cache *cifs_req_cachep;
233 static struct kmem_cache *cifs_mid_cachep;
234 static struct kmem_cache *cifs_sm_req_cachep;
235 mempool_t *cifs_sm_req_poolp;
236 mempool_t *cifs_req_poolp;
237 mempool_t *cifs_mid_poolp;
239 static struct inode *
240 cifs_alloc_inode(struct super_block *sb)
242 struct cifsInodeInfo *cifs_inode;
243 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
246 cifs_inode->cifsAttrs = 0x20; /* default */
247 cifs_inode->time = 0;
249 * Until the file is open and we have gotten oplock info back from the
250 * server, can not assume caching of file data or metadata.
252 cifs_set_oplock_level(cifs_inode, 0);
253 cifs_inode->delete_pending = false;
254 cifs_inode->invalid_mapping = false;
255 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
256 cifs_inode->server_eof = 0;
257 cifs_inode->uniqueid = 0;
258 cifs_inode->createtime = 0;
259 #ifdef CONFIG_CIFS_SMB2
260 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
263 * Can not set i_flags here - they get immediately overwritten to zero
266 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
267 INIT_LIST_HEAD(&cifs_inode->openFileList);
268 INIT_LIST_HEAD(&cifs_inode->llist);
269 return &cifs_inode->vfs_inode;
272 static void cifs_i_callback(struct rcu_head *head)
274 struct inode *inode = container_of(head, struct inode, i_rcu);
275 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
279 cifs_destroy_inode(struct inode *inode)
281 call_rcu(&inode->i_rcu, cifs_i_callback);
285 cifs_evict_inode(struct inode *inode)
287 truncate_inode_pages(&inode->i_data, 0);
289 cifs_fscache_release_inode_cookie(inode);
293 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
295 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
296 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
298 seq_printf(s, ",addr=");
300 switch (server->dstaddr.ss_family) {
302 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
305 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
306 if (sa6->sin6_scope_id)
307 seq_printf(s, "%%%u", sa6->sin6_scope_id);
310 seq_printf(s, "(unknown)");
315 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
317 if (ses->sectype == Unspecified)
320 seq_printf(s, ",sec=");
322 switch (ses->sectype) {
324 seq_printf(s, "lanman");
327 seq_printf(s, "ntlmv2");
330 seq_printf(s, "ntlm");
333 seq_printf(s, "krb5");
336 seq_printf(s, "ntlmssp");
339 /* shouldn't ever happen */
340 seq_printf(s, "unknown");
349 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
351 seq_printf(s, ",cache=");
353 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
354 seq_printf(s, "strict");
355 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
356 seq_printf(s, "none");
358 seq_printf(s, "loose");
362 * cifs_show_options() is for displaying mount options in /proc/mounts.
363 * Not all settable options are displayed but most of the important
367 cifs_show_options(struct seq_file *s, struct dentry *root)
369 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
370 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
371 struct sockaddr *srcaddr;
372 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
374 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
375 cifs_show_security(s, tcon->ses);
376 cifs_show_cache_flavor(s, cifs_sb);
378 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
379 seq_printf(s, ",multiuser");
380 else if (tcon->ses->user_name)
381 seq_printf(s, ",username=%s", tcon->ses->user_name);
383 if (tcon->ses->domainName)
384 seq_printf(s, ",domain=%s", tcon->ses->domainName);
386 if (srcaddr->sa_family != AF_UNSPEC) {
387 struct sockaddr_in *saddr4;
388 struct sockaddr_in6 *saddr6;
389 saddr4 = (struct sockaddr_in *)srcaddr;
390 saddr6 = (struct sockaddr_in6 *)srcaddr;
391 if (srcaddr->sa_family == AF_INET6)
392 seq_printf(s, ",srcaddr=%pI6c",
394 else if (srcaddr->sa_family == AF_INET)
395 seq_printf(s, ",srcaddr=%pI4",
396 &saddr4->sin_addr.s_addr);
398 seq_printf(s, ",srcaddr=BAD-AF:%i",
399 (int)(srcaddr->sa_family));
402 seq_printf(s, ",uid=%u",
403 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
404 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
405 seq_printf(s, ",forceuid");
407 seq_printf(s, ",noforceuid");
409 seq_printf(s, ",gid=%u",
410 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
411 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
412 seq_printf(s, ",forcegid");
414 seq_printf(s, ",noforcegid");
416 cifs_show_address(s, tcon->ses->server);
419 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
420 cifs_sb->mnt_file_mode,
421 cifs_sb->mnt_dir_mode);
423 seq_printf(s, ",seal");
425 seq_printf(s, ",nocase");
427 seq_printf(s, ",hard");
429 seq_printf(s, ",unix");
431 seq_printf(s, ",nounix");
432 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
433 seq_printf(s, ",posixpaths");
434 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
435 seq_printf(s, ",setuids");
436 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
437 seq_printf(s, ",serverino");
438 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
439 seq_printf(s, ",rwpidforward");
440 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
441 seq_printf(s, ",forcemand");
442 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
443 seq_printf(s, ",nouser_xattr");
444 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
445 seq_printf(s, ",mapchars");
446 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
447 seq_printf(s, ",sfu");
448 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
449 seq_printf(s, ",nobrl");
450 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
451 seq_printf(s, ",cifsacl");
452 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
453 seq_printf(s, ",dynperm");
454 if (root->d_sb->s_flags & MS_POSIXACL)
455 seq_printf(s, ",acl");
456 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
457 seq_printf(s, ",mfsymlinks");
458 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
459 seq_printf(s, ",fsc");
460 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
461 seq_printf(s, ",nostrictsync");
462 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
463 seq_printf(s, ",noperm");
464 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
465 seq_printf(s, ",backupuid=%u",
466 from_kuid_munged(&init_user_ns,
467 cifs_sb->mnt_backupuid));
468 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
469 seq_printf(s, ",backupgid=%u",
470 from_kgid_munged(&init_user_ns,
471 cifs_sb->mnt_backupgid));
473 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
474 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
475 /* convert actimeo and display it in seconds */
476 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
481 static void cifs_umount_begin(struct super_block *sb)
483 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
484 struct cifs_tcon *tcon;
489 tcon = cifs_sb_master_tcon(cifs_sb);
491 spin_lock(&cifs_tcp_ses_lock);
492 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
493 /* we have other mounts to same share or we have
494 already tried to force umount this and woken up
495 all waiting network requests, nothing to do */
496 spin_unlock(&cifs_tcp_ses_lock);
498 } else if (tcon->tc_count == 1)
499 tcon->tidStatus = CifsExiting;
500 spin_unlock(&cifs_tcp_ses_lock);
502 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
503 /* cancel_notify_requests(tcon); */
504 if (tcon->ses && tcon->ses->server) {
505 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
506 wake_up_all(&tcon->ses->server->request_q);
507 wake_up_all(&tcon->ses->server->response_q);
508 msleep(1); /* yield */
509 /* we have to kick the requests once more */
510 wake_up_all(&tcon->ses->server->response_q);
517 #ifdef CONFIG_CIFS_STATS2
518 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
525 static int cifs_remount(struct super_block *sb, int *flags, char *data)
527 *flags |= MS_NODIRATIME;
531 static int cifs_drop_inode(struct inode *inode)
533 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
535 /* no serverino => unconditional eviction */
536 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
537 generic_drop_inode(inode);
540 static const struct super_operations cifs_super_ops = {
541 .statfs = cifs_statfs,
542 .alloc_inode = cifs_alloc_inode,
543 .destroy_inode = cifs_destroy_inode,
544 .drop_inode = cifs_drop_inode,
545 .evict_inode = cifs_evict_inode,
546 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
547 function unless later we add lazy close of inodes or unless the
548 kernel forgets to call us with the same number of releases (closes)
550 .show_options = cifs_show_options,
551 .umount_begin = cifs_umount_begin,
552 .remount_fs = cifs_remount,
553 #ifdef CONFIG_CIFS_STATS2
554 .show_stats = cifs_show_stats,
559 * Get root dentry from superblock according to prefix path mount option.
560 * Return dentry with refcount + 1 on success and NULL otherwise.
562 static struct dentry *
563 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
565 struct dentry *dentry;
566 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
567 char *full_path = NULL;
571 full_path = cifs_build_path_to_root(vol, cifs_sb,
572 cifs_sb_master_tcon(cifs_sb));
573 if (full_path == NULL)
574 return ERR_PTR(-ENOMEM);
576 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
578 sep = CIFS_DIR_SEP(cifs_sb);
579 dentry = dget(sb->s_root);
583 struct inode *dir = dentry->d_inode;
584 struct dentry *child;
588 dentry = ERR_PTR(-ENOENT);
591 if (!S_ISDIR(dir->i_mode)) {
593 dentry = ERR_PTR(-ENOTDIR);
597 /* skip separators */
604 while (*s && *s != sep)
607 mutex_lock(&dir->i_mutex);
608 child = lookup_one_len(p, dentry, s - p);
609 mutex_unlock(&dir->i_mutex);
612 } while (!IS_ERR(dentry));
617 static int cifs_set_super(struct super_block *sb, void *data)
619 struct cifs_mnt_data *mnt_data = data;
620 sb->s_fs_info = mnt_data->cifs_sb;
621 return set_anon_super(sb, NULL);
624 static struct dentry *
625 cifs_do_mount(struct file_system_type *fs_type,
626 int flags, const char *dev_name, void *data)
629 struct super_block *sb;
630 struct cifs_sb_info *cifs_sb;
631 struct smb_vol *volume_info;
632 struct cifs_mnt_data mnt_data;
635 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
637 volume_info = cifs_get_volume_info((char *)data, dev_name);
638 if (IS_ERR(volume_info))
639 return ERR_CAST(volume_info);
641 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
642 if (cifs_sb == NULL) {
643 root = ERR_PTR(-ENOMEM);
647 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
648 if (cifs_sb->mountdata == NULL) {
649 root = ERR_PTR(-ENOMEM);
653 cifs_setup_cifs_sb(volume_info, cifs_sb);
655 rc = cifs_mount(cifs_sb, volume_info);
657 if (!(flags & MS_SILENT))
658 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
664 mnt_data.vol = volume_info;
665 mnt_data.cifs_sb = cifs_sb;
666 mnt_data.flags = flags;
668 /* BB should we make this contingent on mount parm? */
669 flags |= MS_NODIRATIME | MS_NOATIME;
671 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
674 cifs_umount(cifs_sb);
679 cifs_dbg(FYI, "Use existing superblock\n");
680 cifs_umount(cifs_sb);
682 rc = cifs_read_super(sb);
688 sb->s_flags |= MS_ACTIVE;
691 root = cifs_get_root(volume_info, sb);
695 cifs_dbg(FYI, "dentry root is: %p\n", root);
699 deactivate_locked_super(sb);
701 cifs_cleanup_volume_info(volume_info);
705 kfree(cifs_sb->mountdata);
709 unload_nls(volume_info->local_nls);
713 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
714 unsigned long nr_segs, loff_t pos)
716 struct inode *inode = file_inode(iocb->ki_filp);
720 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
722 if (CIFS_I(inode)->clientCanCacheAll)
725 rc = filemap_fdatawrite(inode->i_mapping);
727 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
733 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
736 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
737 * the cached file length
739 if (whence != SEEK_SET && whence != SEEK_CUR) {
741 struct inode *inode = file_inode(file);
744 * We need to be sure that all dirty pages are written and the
745 * server has the newest file length.
747 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
748 inode->i_mapping->nrpages != 0) {
749 rc = filemap_fdatawait(inode->i_mapping);
751 mapping_set_error(inode->i_mapping, rc);
756 * Some applications poll for the file length in this strange
757 * way so we must seek to end on non-oplocked files by
758 * setting the revalidate time to zero.
760 CIFS_I(inode)->time = 0;
762 rc = cifs_revalidate_file_attr(file);
766 return generic_file_llseek(file, offset, whence);
769 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
771 /* note that this is called by vfs setlease with i_lock held
772 to protect *lease from going away */
773 struct inode *inode = file_inode(file);
774 struct cifsFileInfo *cfile = file->private_data;
776 if (!(S_ISREG(inode->i_mode)))
779 /* check if file is oplocked */
780 if (((arg == F_RDLCK) &&
781 (CIFS_I(inode)->clientCanCacheRead)) ||
783 (CIFS_I(inode)->clientCanCacheAll)))
784 return generic_setlease(file, arg, lease);
785 else if (tlink_tcon(cfile->tlink)->local_lease &&
786 !CIFS_I(inode)->clientCanCacheRead)
787 /* If the server claims to support oplock on this
788 file, then we still need to check oplock even
789 if the local_lease mount option is set, but there
790 are servers which do not support oplock for which
791 this mount option may be useful if the user
792 knows that the file won't be changed on the server
794 return generic_setlease(file, arg, lease);
799 struct file_system_type cifs_fs_type = {
800 .owner = THIS_MODULE,
802 .mount = cifs_do_mount,
803 .kill_sb = cifs_kill_sb,
806 MODULE_ALIAS_FS("cifs");
807 const struct inode_operations cifs_dir_inode_ops = {
808 .create = cifs_create,
809 .atomic_open = cifs_atomic_open,
810 .lookup = cifs_lookup,
811 .getattr = cifs_getattr,
812 .unlink = cifs_unlink,
813 .link = cifs_hardlink,
816 .rename = cifs_rename,
817 .permission = cifs_permission,
818 /* revalidate:cifs_revalidate, */
819 .setattr = cifs_setattr,
820 .symlink = cifs_symlink,
822 #ifdef CONFIG_CIFS_XATTR
823 .setxattr = cifs_setxattr,
824 .getxattr = cifs_getxattr,
825 .listxattr = cifs_listxattr,
826 .removexattr = cifs_removexattr,
830 const struct inode_operations cifs_file_inode_ops = {
831 /* revalidate:cifs_revalidate, */
832 .setattr = cifs_setattr,
833 .getattr = cifs_getattr, /* do we need this anymore? */
834 .rename = cifs_rename,
835 .permission = cifs_permission,
836 #ifdef CONFIG_CIFS_XATTR
837 .setxattr = cifs_setxattr,
838 .getxattr = cifs_getxattr,
839 .listxattr = cifs_listxattr,
840 .removexattr = cifs_removexattr,
844 const struct inode_operations cifs_symlink_inode_ops = {
845 .readlink = generic_readlink,
846 .follow_link = cifs_follow_link,
847 .put_link = cifs_put_link,
848 .permission = cifs_permission,
849 /* BB add the following two eventually */
850 /* revalidate: cifs_revalidate,
851 setattr: cifs_notify_change, *//* BB do we need notify change */
852 #ifdef CONFIG_CIFS_XATTR
853 .setxattr = cifs_setxattr,
854 .getxattr = cifs_getxattr,
855 .listxattr = cifs_listxattr,
856 .removexattr = cifs_removexattr,
860 const struct file_operations cifs_file_ops = {
861 .read = do_sync_read,
862 .write = do_sync_write,
863 .aio_read = generic_file_aio_read,
864 .aio_write = cifs_file_aio_write,
866 .release = cifs_close,
870 .mmap = cifs_file_mmap,
871 .splice_read = generic_file_splice_read,
872 .llseek = cifs_llseek,
873 #ifdef CONFIG_CIFS_POSIX
874 .unlocked_ioctl = cifs_ioctl,
875 #endif /* CONFIG_CIFS_POSIX */
876 .setlease = cifs_setlease,
879 const struct file_operations cifs_file_strict_ops = {
880 .read = do_sync_read,
881 .write = do_sync_write,
882 .aio_read = cifs_strict_readv,
883 .aio_write = cifs_strict_writev,
885 .release = cifs_close,
887 .fsync = cifs_strict_fsync,
889 .mmap = cifs_file_strict_mmap,
890 .splice_read = generic_file_splice_read,
891 .llseek = cifs_llseek,
892 #ifdef CONFIG_CIFS_POSIX
893 .unlocked_ioctl = cifs_ioctl,
894 #endif /* CONFIG_CIFS_POSIX */
895 .setlease = cifs_setlease,
898 const struct file_operations cifs_file_direct_ops = {
899 /* BB reevaluate whether they can be done with directio, no cache */
900 .read = do_sync_read,
901 .write = do_sync_write,
902 .aio_read = cifs_user_readv,
903 .aio_write = cifs_user_writev,
905 .release = cifs_close,
909 .mmap = cifs_file_mmap,
910 .splice_read = generic_file_splice_read,
911 #ifdef CONFIG_CIFS_POSIX
912 .unlocked_ioctl = cifs_ioctl,
913 #endif /* CONFIG_CIFS_POSIX */
914 .llseek = cifs_llseek,
915 .setlease = cifs_setlease,
918 const struct file_operations cifs_file_nobrl_ops = {
919 .read = do_sync_read,
920 .write = do_sync_write,
921 .aio_read = generic_file_aio_read,
922 .aio_write = cifs_file_aio_write,
924 .release = cifs_close,
927 .mmap = cifs_file_mmap,
928 .splice_read = generic_file_splice_read,
929 .llseek = cifs_llseek,
930 #ifdef CONFIG_CIFS_POSIX
931 .unlocked_ioctl = cifs_ioctl,
932 #endif /* CONFIG_CIFS_POSIX */
933 .setlease = cifs_setlease,
936 const struct file_operations cifs_file_strict_nobrl_ops = {
937 .read = do_sync_read,
938 .write = do_sync_write,
939 .aio_read = cifs_strict_readv,
940 .aio_write = cifs_strict_writev,
942 .release = cifs_close,
943 .fsync = cifs_strict_fsync,
945 .mmap = cifs_file_strict_mmap,
946 .splice_read = generic_file_splice_read,
947 .llseek = cifs_llseek,
948 #ifdef CONFIG_CIFS_POSIX
949 .unlocked_ioctl = cifs_ioctl,
950 #endif /* CONFIG_CIFS_POSIX */
951 .setlease = cifs_setlease,
954 const struct file_operations cifs_file_direct_nobrl_ops = {
955 /* BB reevaluate whether they can be done with directio, no cache */
956 .read = do_sync_read,
957 .write = do_sync_write,
958 .aio_read = cifs_user_readv,
959 .aio_write = cifs_user_writev,
961 .release = cifs_close,
964 .mmap = cifs_file_mmap,
965 .splice_read = generic_file_splice_read,
966 #ifdef CONFIG_CIFS_POSIX
967 .unlocked_ioctl = cifs_ioctl,
968 #endif /* CONFIG_CIFS_POSIX */
969 .llseek = cifs_llseek,
970 .setlease = cifs_setlease,
973 const struct file_operations cifs_dir_ops = {
974 .iterate = cifs_readdir,
975 .release = cifs_closedir,
976 .read = generic_read_dir,
977 .unlocked_ioctl = cifs_ioctl,
978 .llseek = generic_file_llseek,
982 cifs_init_once(void *inode)
984 struct cifsInodeInfo *cifsi = inode;
986 inode_init_once(&cifsi->vfs_inode);
987 init_rwsem(&cifsi->lock_sem);
991 cifs_init_inodecache(void)
993 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
994 sizeof(struct cifsInodeInfo),
995 0, (SLAB_RECLAIM_ACCOUNT|
998 if (cifs_inode_cachep == NULL)
1005 cifs_destroy_inodecache(void)
1008 * Make sure all delayed rcu free inodes are flushed before we
1012 kmem_cache_destroy(cifs_inode_cachep);
1016 cifs_init_request_bufs(void)
1018 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1019 #ifdef CONFIG_CIFS_SMB2
1021 * SMB2 maximum header size is bigger than CIFS one - no problems to
1022 * allocate some more bytes for CIFS.
1024 max_hdr_size = MAX_SMB2_HDR_SIZE;
1026 if (CIFSMaxBufSize < 8192) {
1027 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1028 Unicode path name has to fit in any SMB/CIFS path based frames */
1029 CIFSMaxBufSize = 8192;
1030 } else if (CIFSMaxBufSize > 1024*127) {
1031 CIFSMaxBufSize = 1024 * 127;
1033 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1036 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1037 CIFSMaxBufSize, CIFSMaxBufSize);
1039 cifs_req_cachep = kmem_cache_create("cifs_request",
1040 CIFSMaxBufSize + max_hdr_size, 0,
1041 SLAB_HWCACHE_ALIGN, NULL);
1042 if (cifs_req_cachep == NULL)
1045 if (cifs_min_rcv < 1)
1047 else if (cifs_min_rcv > 64) {
1049 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1052 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1055 if (cifs_req_poolp == NULL) {
1056 kmem_cache_destroy(cifs_req_cachep);
1059 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1060 almost all handle based requests (but not write response, nor is it
1061 sufficient for path based requests). A smaller size would have
1062 been more efficient (compacting multiple slab items on one 4k page)
1063 for the case in which debug was on, but this larger size allows
1064 more SMBs to use small buffer alloc and is still much more
1065 efficient to alloc 1 per page off the slab compared to 17K (5page)
1066 alloc of large cifs buffers even when page debugging is on */
1067 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1068 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1070 if (cifs_sm_req_cachep == NULL) {
1071 mempool_destroy(cifs_req_poolp);
1072 kmem_cache_destroy(cifs_req_cachep);
1076 if (cifs_min_small < 2)
1078 else if (cifs_min_small > 256) {
1079 cifs_min_small = 256;
1080 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1083 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1084 cifs_sm_req_cachep);
1086 if (cifs_sm_req_poolp == NULL) {
1087 mempool_destroy(cifs_req_poolp);
1088 kmem_cache_destroy(cifs_req_cachep);
1089 kmem_cache_destroy(cifs_sm_req_cachep);
1097 cifs_destroy_request_bufs(void)
1099 mempool_destroy(cifs_req_poolp);
1100 kmem_cache_destroy(cifs_req_cachep);
1101 mempool_destroy(cifs_sm_req_poolp);
1102 kmem_cache_destroy(cifs_sm_req_cachep);
1106 cifs_init_mids(void)
1108 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1109 sizeof(struct mid_q_entry), 0,
1110 SLAB_HWCACHE_ALIGN, NULL);
1111 if (cifs_mid_cachep == NULL)
1114 /* 3 is a reasonable minimum number of simultaneous operations */
1115 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1116 if (cifs_mid_poolp == NULL) {
1117 kmem_cache_destroy(cifs_mid_cachep);
1125 cifs_destroy_mids(void)
1127 mempool_destroy(cifs_mid_poolp);
1128 kmem_cache_destroy(cifs_mid_cachep);
1136 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1137 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1138 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1139 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1140 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1142 * Initialize Global counters
1144 atomic_set(&sesInfoAllocCount, 0);
1145 atomic_set(&tconInfoAllocCount, 0);
1146 atomic_set(&tcpSesAllocCount, 0);
1147 atomic_set(&tcpSesReconnectCount, 0);
1148 atomic_set(&tconInfoReconnectCount, 0);
1150 atomic_set(&bufAllocCount, 0);
1151 atomic_set(&smBufAllocCount, 0);
1152 #ifdef CONFIG_CIFS_STATS2
1153 atomic_set(&totBufAllocCount, 0);
1154 atomic_set(&totSmBufAllocCount, 0);
1155 #endif /* CONFIG_CIFS_STATS2 */
1157 atomic_set(&midCount, 0);
1158 GlobalCurrentXid = 0;
1159 GlobalTotalActiveXid = 0;
1160 GlobalMaxActiveXid = 0;
1161 spin_lock_init(&cifs_tcp_ses_lock);
1162 spin_lock_init(&cifs_file_list_lock);
1163 spin_lock_init(&GlobalMid_Lock);
1165 #ifdef CONFIG_CIFS_SMB2
1166 get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1169 if (cifs_max_pending < 2) {
1170 cifs_max_pending = 2;
1171 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1172 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1173 cifs_max_pending = CIFS_MAX_REQ;
1174 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1178 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1181 goto out_clean_proc;
1184 rc = cifs_fscache_register();
1186 goto out_destroy_wq;
1188 rc = cifs_init_inodecache();
1190 goto out_unreg_fscache;
1192 rc = cifs_init_mids();
1194 goto out_destroy_inodecache;
1196 rc = cifs_init_request_bufs();
1198 goto out_destroy_mids;
1200 #ifdef CONFIG_CIFS_UPCALL
1201 rc = register_key_type(&cifs_spnego_key_type);
1203 goto out_destroy_request_bufs;
1204 #endif /* CONFIG_CIFS_UPCALL */
1206 #ifdef CONFIG_CIFS_ACL
1207 rc = init_cifs_idmap();
1209 goto out_register_key_type;
1210 #endif /* CONFIG_CIFS_ACL */
1212 rc = register_filesystem(&cifs_fs_type);
1214 goto out_init_cifs_idmap;
1218 out_init_cifs_idmap:
1219 #ifdef CONFIG_CIFS_ACL
1221 out_register_key_type:
1223 #ifdef CONFIG_CIFS_UPCALL
1224 unregister_key_type(&cifs_spnego_key_type);
1225 out_destroy_request_bufs:
1227 cifs_destroy_request_bufs();
1229 cifs_destroy_mids();
1230 out_destroy_inodecache:
1231 cifs_destroy_inodecache();
1233 cifs_fscache_unregister();
1235 destroy_workqueue(cifsiod_wq);
1244 cifs_dbg(NOISY, "exit_cifs\n");
1245 unregister_filesystem(&cifs_fs_type);
1246 cifs_dfs_release_automount_timer();
1247 #ifdef CONFIG_CIFS_ACL
1250 #ifdef CONFIG_CIFS_UPCALL
1251 unregister_key_type(&cifs_spnego_key_type);
1253 cifs_destroy_request_bufs();
1254 cifs_destroy_mids();
1255 cifs_destroy_inodecache();
1256 cifs_fscache_unregister();
1257 destroy_workqueue(cifsiod_wq);
1261 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1262 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1264 ("VFS to access servers complying with the SNIA CIFS Specification "
1265 "e.g. Samba and Windows");
1266 MODULE_VERSION(CIFS_VERSION);
1267 module_init(init_cifs)
1268 module_exit(exit_cifs)