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 TCP_Server_Info *server)
317 seq_printf(s, ",sec=");
319 switch (server->secType) {
321 seq_printf(s, "lanman");
324 seq_printf(s, "ntlmv2");
327 seq_printf(s, "ntlm");
330 seq_printf(s, "krb5");
333 seq_printf(s, "ntlmssp");
336 /* shouldn't ever happen */
337 seq_printf(s, "unknown");
341 if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
346 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
348 seq_printf(s, ",cache=");
350 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
351 seq_printf(s, "strict");
352 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
353 seq_printf(s, "none");
355 seq_printf(s, "loose");
359 * cifs_show_options() is for displaying mount options in /proc/mounts.
360 * Not all settable options are displayed but most of the important
364 cifs_show_options(struct seq_file *s, struct dentry *root)
366 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
367 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
368 struct sockaddr *srcaddr;
369 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
371 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
372 cifs_show_security(s, tcon->ses->server);
373 cifs_show_cache_flavor(s, cifs_sb);
375 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
376 seq_printf(s, ",multiuser");
377 else if (tcon->ses->user_name)
378 seq_printf(s, ",username=%s", tcon->ses->user_name);
380 if (tcon->ses->domainName)
381 seq_printf(s, ",domain=%s", tcon->ses->domainName);
383 if (srcaddr->sa_family != AF_UNSPEC) {
384 struct sockaddr_in *saddr4;
385 struct sockaddr_in6 *saddr6;
386 saddr4 = (struct sockaddr_in *)srcaddr;
387 saddr6 = (struct sockaddr_in6 *)srcaddr;
388 if (srcaddr->sa_family == AF_INET6)
389 seq_printf(s, ",srcaddr=%pI6c",
391 else if (srcaddr->sa_family == AF_INET)
392 seq_printf(s, ",srcaddr=%pI4",
393 &saddr4->sin_addr.s_addr);
395 seq_printf(s, ",srcaddr=BAD-AF:%i",
396 (int)(srcaddr->sa_family));
399 seq_printf(s, ",uid=%u",
400 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
401 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
402 seq_printf(s, ",forceuid");
404 seq_printf(s, ",noforceuid");
406 seq_printf(s, ",gid=%u",
407 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
408 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
409 seq_printf(s, ",forcegid");
411 seq_printf(s, ",noforcegid");
413 cifs_show_address(s, tcon->ses->server);
416 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
417 cifs_sb->mnt_file_mode,
418 cifs_sb->mnt_dir_mode);
420 seq_printf(s, ",seal");
422 seq_printf(s, ",nocase");
424 seq_printf(s, ",hard");
426 seq_printf(s, ",unix");
428 seq_printf(s, ",nounix");
429 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
430 seq_printf(s, ",posixpaths");
431 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
432 seq_printf(s, ",setuids");
433 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
434 seq_printf(s, ",serverino");
435 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
436 seq_printf(s, ",rwpidforward");
437 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
438 seq_printf(s, ",forcemand");
439 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
440 seq_printf(s, ",nouser_xattr");
441 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
442 seq_printf(s, ",mapchars");
443 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
444 seq_printf(s, ",sfu");
445 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
446 seq_printf(s, ",nobrl");
447 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
448 seq_printf(s, ",cifsacl");
449 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
450 seq_printf(s, ",dynperm");
451 if (root->d_sb->s_flags & MS_POSIXACL)
452 seq_printf(s, ",acl");
453 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
454 seq_printf(s, ",mfsymlinks");
455 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
456 seq_printf(s, ",fsc");
457 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
458 seq_printf(s, ",nostrictsync");
459 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
460 seq_printf(s, ",noperm");
461 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
462 seq_printf(s, ",backupuid=%u",
463 from_kuid_munged(&init_user_ns,
464 cifs_sb->mnt_backupuid));
465 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
466 seq_printf(s, ",backupgid=%u",
467 from_kgid_munged(&init_user_ns,
468 cifs_sb->mnt_backupgid));
470 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
471 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
472 /* convert actimeo and display it in seconds */
473 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
478 static void cifs_umount_begin(struct super_block *sb)
480 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
481 struct cifs_tcon *tcon;
486 tcon = cifs_sb_master_tcon(cifs_sb);
488 spin_lock(&cifs_tcp_ses_lock);
489 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
490 /* we have other mounts to same share or we have
491 already tried to force umount this and woken up
492 all waiting network requests, nothing to do */
493 spin_unlock(&cifs_tcp_ses_lock);
495 } else if (tcon->tc_count == 1)
496 tcon->tidStatus = CifsExiting;
497 spin_unlock(&cifs_tcp_ses_lock);
499 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
500 /* cancel_notify_requests(tcon); */
501 if (tcon->ses && tcon->ses->server) {
502 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
503 wake_up_all(&tcon->ses->server->request_q);
504 wake_up_all(&tcon->ses->server->response_q);
505 msleep(1); /* yield */
506 /* we have to kick the requests once more */
507 wake_up_all(&tcon->ses->server->response_q);
514 #ifdef CONFIG_CIFS_STATS2
515 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
522 static int cifs_remount(struct super_block *sb, int *flags, char *data)
525 *flags |= MS_NODIRATIME;
529 static int cifs_drop_inode(struct inode *inode)
531 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
533 /* no serverino => unconditional eviction */
534 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
535 generic_drop_inode(inode);
538 static const struct super_operations cifs_super_ops = {
539 .statfs = cifs_statfs,
540 .alloc_inode = cifs_alloc_inode,
541 .destroy_inode = cifs_destroy_inode,
542 .drop_inode = cifs_drop_inode,
543 .evict_inode = cifs_evict_inode,
544 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
545 function unless later we add lazy close of inodes or unless the
546 kernel forgets to call us with the same number of releases (closes)
548 .show_options = cifs_show_options,
549 .umount_begin = cifs_umount_begin,
550 .remount_fs = cifs_remount,
551 #ifdef CONFIG_CIFS_STATS2
552 .show_stats = cifs_show_stats,
557 * Get root dentry from superblock according to prefix path mount option.
558 * Return dentry with refcount + 1 on success and NULL otherwise.
560 static struct dentry *
561 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
563 struct dentry *dentry;
564 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
565 char *full_path = NULL;
569 full_path = cifs_build_path_to_root(vol, cifs_sb,
570 cifs_sb_master_tcon(cifs_sb));
571 if (full_path == NULL)
572 return ERR_PTR(-ENOMEM);
574 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
576 sep = CIFS_DIR_SEP(cifs_sb);
577 dentry = dget(sb->s_root);
581 struct inode *dir = dentry->d_inode;
582 struct dentry *child;
586 dentry = ERR_PTR(-ENOENT);
589 if (!S_ISDIR(dir->i_mode)) {
591 dentry = ERR_PTR(-ENOTDIR);
595 /* skip separators */
602 while (*s && *s != sep)
605 mutex_lock(&dir->i_mutex);
606 child = lookup_one_len(p, dentry, s - p);
607 mutex_unlock(&dir->i_mutex);
610 } while (!IS_ERR(dentry));
615 static int cifs_set_super(struct super_block *sb, void *data)
617 struct cifs_mnt_data *mnt_data = data;
618 sb->s_fs_info = mnt_data->cifs_sb;
619 return set_anon_super(sb, NULL);
622 static struct dentry *
623 cifs_do_mount(struct file_system_type *fs_type,
624 int flags, const char *dev_name, void *data)
627 struct super_block *sb;
628 struct cifs_sb_info *cifs_sb;
629 struct smb_vol *volume_info;
630 struct cifs_mnt_data mnt_data;
633 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
635 volume_info = cifs_get_volume_info((char *)data, dev_name);
636 if (IS_ERR(volume_info))
637 return ERR_CAST(volume_info);
639 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
640 if (cifs_sb == NULL) {
641 root = ERR_PTR(-ENOMEM);
645 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
646 if (cifs_sb->mountdata == NULL) {
647 root = ERR_PTR(-ENOMEM);
651 cifs_setup_cifs_sb(volume_info, cifs_sb);
653 rc = cifs_mount(cifs_sb, volume_info);
655 if (!(flags & MS_SILENT))
656 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
662 mnt_data.vol = volume_info;
663 mnt_data.cifs_sb = cifs_sb;
664 mnt_data.flags = flags;
666 /* BB should we make this contingent on mount parm? */
667 flags |= MS_NODIRATIME | MS_NOATIME;
669 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
672 cifs_umount(cifs_sb);
677 cifs_dbg(FYI, "Use existing superblock\n");
678 cifs_umount(cifs_sb);
680 rc = cifs_read_super(sb);
686 sb->s_flags |= MS_ACTIVE;
689 root = cifs_get_root(volume_info, sb);
693 cifs_dbg(FYI, "dentry root is: %p\n", root);
697 deactivate_locked_super(sb);
699 cifs_cleanup_volume_info(volume_info);
703 kfree(cifs_sb->mountdata);
707 unload_nls(volume_info->local_nls);
711 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
712 unsigned long nr_segs, loff_t pos)
714 struct inode *inode = file_inode(iocb->ki_filp);
718 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
720 if (CIFS_I(inode)->clientCanCacheAll)
723 rc = filemap_fdatawrite(inode->i_mapping);
725 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
731 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
734 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
735 * the cached file length
737 if (whence != SEEK_SET && whence != SEEK_CUR) {
739 struct inode *inode = file_inode(file);
742 * We need to be sure that all dirty pages are written and the
743 * server has the newest file length.
745 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
746 inode->i_mapping->nrpages != 0) {
747 rc = filemap_fdatawait(inode->i_mapping);
749 mapping_set_error(inode->i_mapping, rc);
754 * Some applications poll for the file length in this strange
755 * way so we must seek to end on non-oplocked files by
756 * setting the revalidate time to zero.
758 CIFS_I(inode)->time = 0;
760 rc = cifs_revalidate_file_attr(file);
764 return generic_file_llseek(file, offset, whence);
767 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
769 /* note that this is called by vfs setlease with lock_flocks held
770 to protect *lease from going away */
771 struct inode *inode = file_inode(file);
772 struct cifsFileInfo *cfile = file->private_data;
774 if (!(S_ISREG(inode->i_mode)))
777 /* check if file is oplocked */
778 if (((arg == F_RDLCK) &&
779 (CIFS_I(inode)->clientCanCacheRead)) ||
781 (CIFS_I(inode)->clientCanCacheAll)))
782 return generic_setlease(file, arg, lease);
783 else if (tlink_tcon(cfile->tlink)->local_lease &&
784 !CIFS_I(inode)->clientCanCacheRead)
785 /* If the server claims to support oplock on this
786 file, then we still need to check oplock even
787 if the local_lease mount option is set, but there
788 are servers which do not support oplock for which
789 this mount option may be useful if the user
790 knows that the file won't be changed on the server
792 return generic_setlease(file, arg, lease);
797 struct file_system_type cifs_fs_type = {
798 .owner = THIS_MODULE,
800 .mount = cifs_do_mount,
801 .kill_sb = cifs_kill_sb,
804 MODULE_ALIAS_FS("cifs");
805 const struct inode_operations cifs_dir_inode_ops = {
806 .create = cifs_create,
807 .atomic_open = cifs_atomic_open,
808 .lookup = cifs_lookup,
809 .getattr = cifs_getattr,
810 .unlink = cifs_unlink,
811 .link = cifs_hardlink,
814 .rename = cifs_rename,
815 .permission = cifs_permission,
816 /* revalidate:cifs_revalidate, */
817 .setattr = cifs_setattr,
818 .symlink = cifs_symlink,
820 #ifdef CONFIG_CIFS_XATTR
821 .setxattr = cifs_setxattr,
822 .getxattr = cifs_getxattr,
823 .listxattr = cifs_listxattr,
824 .removexattr = cifs_removexattr,
828 const struct inode_operations cifs_file_inode_ops = {
829 /* revalidate:cifs_revalidate, */
830 .setattr = cifs_setattr,
831 .getattr = cifs_getattr, /* do we need this anymore? */
832 .rename = cifs_rename,
833 .permission = cifs_permission,
834 #ifdef CONFIG_CIFS_XATTR
835 .setxattr = cifs_setxattr,
836 .getxattr = cifs_getxattr,
837 .listxattr = cifs_listxattr,
838 .removexattr = cifs_removexattr,
842 const struct inode_operations cifs_symlink_inode_ops = {
843 .readlink = generic_readlink,
844 .follow_link = cifs_follow_link,
845 .put_link = cifs_put_link,
846 .permission = cifs_permission,
847 /* BB add the following two eventually */
848 /* revalidate: cifs_revalidate,
849 setattr: cifs_notify_change, *//* BB do we need notify change */
850 #ifdef CONFIG_CIFS_XATTR
851 .setxattr = cifs_setxattr,
852 .getxattr = cifs_getxattr,
853 .listxattr = cifs_listxattr,
854 .removexattr = cifs_removexattr,
858 const struct file_operations cifs_file_ops = {
859 .read = do_sync_read,
860 .write = do_sync_write,
861 .aio_read = generic_file_aio_read,
862 .aio_write = cifs_file_aio_write,
864 .release = cifs_close,
868 .mmap = cifs_file_mmap,
869 .splice_read = generic_file_splice_read,
870 .llseek = cifs_llseek,
871 #ifdef CONFIG_CIFS_POSIX
872 .unlocked_ioctl = cifs_ioctl,
873 #endif /* CONFIG_CIFS_POSIX */
874 .setlease = cifs_setlease,
877 const struct file_operations cifs_file_strict_ops = {
878 .read = do_sync_read,
879 .write = do_sync_write,
880 .aio_read = cifs_strict_readv,
881 .aio_write = cifs_strict_writev,
883 .release = cifs_close,
885 .fsync = cifs_strict_fsync,
887 .mmap = cifs_file_strict_mmap,
888 .splice_read = generic_file_splice_read,
889 .llseek = cifs_llseek,
890 #ifdef CONFIG_CIFS_POSIX
891 .unlocked_ioctl = cifs_ioctl,
892 #endif /* CONFIG_CIFS_POSIX */
893 .setlease = cifs_setlease,
896 const struct file_operations cifs_file_direct_ops = {
897 /* BB reevaluate whether they can be done with directio, no cache */
898 .read = do_sync_read,
899 .write = do_sync_write,
900 .aio_read = cifs_user_readv,
901 .aio_write = cifs_user_writev,
903 .release = cifs_close,
907 .mmap = cifs_file_mmap,
908 .splice_read = generic_file_splice_read,
909 #ifdef CONFIG_CIFS_POSIX
910 .unlocked_ioctl = cifs_ioctl,
911 #endif /* CONFIG_CIFS_POSIX */
912 .llseek = cifs_llseek,
913 .setlease = cifs_setlease,
916 const struct file_operations cifs_file_nobrl_ops = {
917 .read = do_sync_read,
918 .write = do_sync_write,
919 .aio_read = generic_file_aio_read,
920 .aio_write = cifs_file_aio_write,
922 .release = cifs_close,
925 .mmap = cifs_file_mmap,
926 .splice_read = generic_file_splice_read,
927 .llseek = cifs_llseek,
928 #ifdef CONFIG_CIFS_POSIX
929 .unlocked_ioctl = cifs_ioctl,
930 #endif /* CONFIG_CIFS_POSIX */
931 .setlease = cifs_setlease,
934 const struct file_operations cifs_file_strict_nobrl_ops = {
935 .read = do_sync_read,
936 .write = do_sync_write,
937 .aio_read = cifs_strict_readv,
938 .aio_write = cifs_strict_writev,
940 .release = cifs_close,
941 .fsync = cifs_strict_fsync,
943 .mmap = cifs_file_strict_mmap,
944 .splice_read = generic_file_splice_read,
945 .llseek = cifs_llseek,
946 #ifdef CONFIG_CIFS_POSIX
947 .unlocked_ioctl = cifs_ioctl,
948 #endif /* CONFIG_CIFS_POSIX */
949 .setlease = cifs_setlease,
952 const struct file_operations cifs_file_direct_nobrl_ops = {
953 /* BB reevaluate whether they can be done with directio, no cache */
954 .read = do_sync_read,
955 .write = do_sync_write,
956 .aio_read = cifs_user_readv,
957 .aio_write = cifs_user_writev,
959 .release = cifs_close,
962 .mmap = cifs_file_mmap,
963 .splice_read = generic_file_splice_read,
964 #ifdef CONFIG_CIFS_POSIX
965 .unlocked_ioctl = cifs_ioctl,
966 #endif /* CONFIG_CIFS_POSIX */
967 .llseek = cifs_llseek,
968 .setlease = cifs_setlease,
971 const struct file_operations cifs_dir_ops = {
972 .readdir = cifs_readdir,
973 .release = cifs_closedir,
974 .read = generic_read_dir,
975 .unlocked_ioctl = cifs_ioctl,
976 .llseek = generic_file_llseek,
980 cifs_init_once(void *inode)
982 struct cifsInodeInfo *cifsi = inode;
984 inode_init_once(&cifsi->vfs_inode);
985 init_rwsem(&cifsi->lock_sem);
989 cifs_init_inodecache(void)
991 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
992 sizeof(struct cifsInodeInfo),
993 0, (SLAB_RECLAIM_ACCOUNT|
996 if (cifs_inode_cachep == NULL)
1003 cifs_destroy_inodecache(void)
1006 * Make sure all delayed rcu free inodes are flushed before we
1010 kmem_cache_destroy(cifs_inode_cachep);
1014 cifs_init_request_bufs(void)
1016 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1017 #ifdef CONFIG_CIFS_SMB2
1019 * SMB2 maximum header size is bigger than CIFS one - no problems to
1020 * allocate some more bytes for CIFS.
1022 max_hdr_size = MAX_SMB2_HDR_SIZE;
1024 if (CIFSMaxBufSize < 8192) {
1025 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1026 Unicode path name has to fit in any SMB/CIFS path based frames */
1027 CIFSMaxBufSize = 8192;
1028 } else if (CIFSMaxBufSize > 1024*127) {
1029 CIFSMaxBufSize = 1024 * 127;
1031 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1034 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1035 CIFSMaxBufSize, CIFSMaxBufSize);
1037 cifs_req_cachep = kmem_cache_create("cifs_request",
1038 CIFSMaxBufSize + max_hdr_size, 0,
1039 SLAB_HWCACHE_ALIGN, NULL);
1040 if (cifs_req_cachep == NULL)
1043 if (cifs_min_rcv < 1)
1045 else if (cifs_min_rcv > 64) {
1047 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1050 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1053 if (cifs_req_poolp == NULL) {
1054 kmem_cache_destroy(cifs_req_cachep);
1057 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1058 almost all handle based requests (but not write response, nor is it
1059 sufficient for path based requests). A smaller size would have
1060 been more efficient (compacting multiple slab items on one 4k page)
1061 for the case in which debug was on, but this larger size allows
1062 more SMBs to use small buffer alloc and is still much more
1063 efficient to alloc 1 per page off the slab compared to 17K (5page)
1064 alloc of large cifs buffers even when page debugging is on */
1065 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1066 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1068 if (cifs_sm_req_cachep == NULL) {
1069 mempool_destroy(cifs_req_poolp);
1070 kmem_cache_destroy(cifs_req_cachep);
1074 if (cifs_min_small < 2)
1076 else if (cifs_min_small > 256) {
1077 cifs_min_small = 256;
1078 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1081 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1082 cifs_sm_req_cachep);
1084 if (cifs_sm_req_poolp == NULL) {
1085 mempool_destroy(cifs_req_poolp);
1086 kmem_cache_destroy(cifs_req_cachep);
1087 kmem_cache_destroy(cifs_sm_req_cachep);
1095 cifs_destroy_request_bufs(void)
1097 mempool_destroy(cifs_req_poolp);
1098 kmem_cache_destroy(cifs_req_cachep);
1099 mempool_destroy(cifs_sm_req_poolp);
1100 kmem_cache_destroy(cifs_sm_req_cachep);
1104 cifs_init_mids(void)
1106 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1107 sizeof(struct mid_q_entry), 0,
1108 SLAB_HWCACHE_ALIGN, NULL);
1109 if (cifs_mid_cachep == NULL)
1112 /* 3 is a reasonable minimum number of simultaneous operations */
1113 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1114 if (cifs_mid_poolp == NULL) {
1115 kmem_cache_destroy(cifs_mid_cachep);
1123 cifs_destroy_mids(void)
1125 mempool_destroy(cifs_mid_poolp);
1126 kmem_cache_destroy(cifs_mid_cachep);
1134 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1135 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1136 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1137 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1138 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1140 * Initialize Global counters
1142 atomic_set(&sesInfoAllocCount, 0);
1143 atomic_set(&tconInfoAllocCount, 0);
1144 atomic_set(&tcpSesAllocCount, 0);
1145 atomic_set(&tcpSesReconnectCount, 0);
1146 atomic_set(&tconInfoReconnectCount, 0);
1148 atomic_set(&bufAllocCount, 0);
1149 atomic_set(&smBufAllocCount, 0);
1150 #ifdef CONFIG_CIFS_STATS2
1151 atomic_set(&totBufAllocCount, 0);
1152 atomic_set(&totSmBufAllocCount, 0);
1153 #endif /* CONFIG_CIFS_STATS2 */
1155 atomic_set(&midCount, 0);
1156 GlobalCurrentXid = 0;
1157 GlobalTotalActiveXid = 0;
1158 GlobalMaxActiveXid = 0;
1159 spin_lock_init(&cifs_tcp_ses_lock);
1160 spin_lock_init(&cifs_file_list_lock);
1161 spin_lock_init(&GlobalMid_Lock);
1163 #ifdef CONFIG_CIFS_SMB2
1164 get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1167 if (cifs_max_pending < 2) {
1168 cifs_max_pending = 2;
1169 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1170 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1171 cifs_max_pending = CIFS_MAX_REQ;
1172 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1176 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1179 goto out_clean_proc;
1182 rc = cifs_fscache_register();
1184 goto out_destroy_wq;
1186 rc = cifs_init_inodecache();
1188 goto out_unreg_fscache;
1190 rc = cifs_init_mids();
1192 goto out_destroy_inodecache;
1194 rc = cifs_init_request_bufs();
1196 goto out_destroy_mids;
1198 #ifdef CONFIG_CIFS_UPCALL
1199 rc = register_key_type(&cifs_spnego_key_type);
1201 goto out_destroy_request_bufs;
1202 #endif /* CONFIG_CIFS_UPCALL */
1204 #ifdef CONFIG_CIFS_ACL
1205 rc = init_cifs_idmap();
1207 goto out_register_key_type;
1208 #endif /* CONFIG_CIFS_ACL */
1210 rc = register_filesystem(&cifs_fs_type);
1212 goto out_init_cifs_idmap;
1216 out_init_cifs_idmap:
1217 #ifdef CONFIG_CIFS_ACL
1219 out_register_key_type:
1221 #ifdef CONFIG_CIFS_UPCALL
1222 unregister_key_type(&cifs_spnego_key_type);
1223 out_destroy_request_bufs:
1225 cifs_destroy_request_bufs();
1227 cifs_destroy_mids();
1228 out_destroy_inodecache:
1229 cifs_destroy_inodecache();
1231 cifs_fscache_unregister();
1233 destroy_workqueue(cifsiod_wq);
1242 cifs_dbg(NOISY, "exit_cifs\n");
1243 unregister_filesystem(&cifs_fs_type);
1244 cifs_dfs_release_automount_timer();
1245 #ifdef CONFIG_CIFS_ACL
1248 #ifdef CONFIG_CIFS_UPCALL
1249 unregister_key_type(&cifs_spnego_key_type);
1251 cifs_destroy_request_bufs();
1252 cifs_destroy_mids();
1253 cifs_destroy_inodecache();
1254 cifs_fscache_unregister();
1255 destroy_workqueue(cifsiod_wq);
1259 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1260 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1262 ("VFS to access servers complying with the SNIA CIFS Specification "
1263 "e.g. Samba and Windows");
1264 MODULE_VERSION(CIFS_VERSION);
1265 module_init(init_cifs)
1266 module_exit(exit_cifs)