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 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
257 cifs_inode->server_eof = 0;
258 cifs_inode->uniqueid = 0;
259 cifs_inode->createtime = 0;
260 cifs_inode->epoch = 0;
261 #ifdef CONFIG_CIFS_SMB2
262 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
265 * Can not set i_flags here - they get immediately overwritten to zero
268 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
269 INIT_LIST_HEAD(&cifs_inode->openFileList);
270 INIT_LIST_HEAD(&cifs_inode->llist);
271 return &cifs_inode->vfs_inode;
274 static void cifs_i_callback(struct rcu_head *head)
276 struct inode *inode = container_of(head, struct inode, i_rcu);
277 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
281 cifs_destroy_inode(struct inode *inode)
283 call_rcu(&inode->i_rcu, cifs_i_callback);
287 cifs_evict_inode(struct inode *inode)
289 truncate_inode_pages_final(&inode->i_data);
291 cifs_fscache_release_inode_cookie(inode);
295 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
297 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
298 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
300 seq_printf(s, ",addr=");
302 switch (server->dstaddr.ss_family) {
304 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
307 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
308 if (sa6->sin6_scope_id)
309 seq_printf(s, "%%%u", sa6->sin6_scope_id);
312 seq_printf(s, "(unknown)");
317 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
319 if (ses->sectype == Unspecified)
322 seq_printf(s, ",sec=");
324 switch (ses->sectype) {
326 seq_printf(s, "lanman");
329 seq_printf(s, "ntlmv2");
332 seq_printf(s, "ntlm");
335 seq_printf(s, "krb5");
338 seq_printf(s, "ntlmssp");
341 /* shouldn't ever happen */
342 seq_printf(s, "unknown");
351 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
353 seq_printf(s, ",cache=");
355 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
356 seq_printf(s, "strict");
357 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
358 seq_printf(s, "none");
360 seq_printf(s, "loose");
364 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
366 struct nls_table *def;
368 /* Display iocharset= option if it's not default charset */
369 def = load_nls_default();
371 seq_printf(s, ",iocharset=%s", cur->charset);
376 * cifs_show_options() is for displaying mount options in /proc/mounts.
377 * Not all settable options are displayed but most of the important
381 cifs_show_options(struct seq_file *s, struct dentry *root)
383 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
384 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
385 struct sockaddr *srcaddr;
386 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
388 seq_printf(s, ",vers=%s", tcon->ses->server->vals->version_string);
389 cifs_show_security(s, tcon->ses);
390 cifs_show_cache_flavor(s, cifs_sb);
392 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
393 seq_printf(s, ",multiuser");
394 else if (tcon->ses->user_name)
395 seq_printf(s, ",username=%s", tcon->ses->user_name);
397 if (tcon->ses->domainName)
398 seq_printf(s, ",domain=%s", tcon->ses->domainName);
400 if (srcaddr->sa_family != AF_UNSPEC) {
401 struct sockaddr_in *saddr4;
402 struct sockaddr_in6 *saddr6;
403 saddr4 = (struct sockaddr_in *)srcaddr;
404 saddr6 = (struct sockaddr_in6 *)srcaddr;
405 if (srcaddr->sa_family == AF_INET6)
406 seq_printf(s, ",srcaddr=%pI6c",
408 else if (srcaddr->sa_family == AF_INET)
409 seq_printf(s, ",srcaddr=%pI4",
410 &saddr4->sin_addr.s_addr);
412 seq_printf(s, ",srcaddr=BAD-AF:%i",
413 (int)(srcaddr->sa_family));
416 seq_printf(s, ",uid=%u",
417 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
418 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
419 seq_printf(s, ",forceuid");
421 seq_printf(s, ",noforceuid");
423 seq_printf(s, ",gid=%u",
424 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
425 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
426 seq_printf(s, ",forcegid");
428 seq_printf(s, ",noforcegid");
430 cifs_show_address(s, tcon->ses->server);
433 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
434 cifs_sb->mnt_file_mode,
435 cifs_sb->mnt_dir_mode);
437 cifs_show_nls(s, cifs_sb->local_nls);
440 seq_printf(s, ",seal");
442 seq_printf(s, ",nocase");
444 seq_printf(s, ",hard");
446 seq_printf(s, ",unix");
448 seq_printf(s, ",nounix");
449 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
450 seq_printf(s, ",posixpaths");
451 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
452 seq_printf(s, ",setuids");
453 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
454 seq_printf(s, ",serverino");
455 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
456 seq_printf(s, ",rwpidforward");
457 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
458 seq_printf(s, ",forcemand");
459 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
460 seq_printf(s, ",nouser_xattr");
461 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
462 seq_printf(s, ",mapchars");
463 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
464 seq_printf(s, ",sfu");
465 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
466 seq_printf(s, ",nobrl");
467 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
468 seq_printf(s, ",cifsacl");
469 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
470 seq_printf(s, ",dynperm");
471 if (root->d_sb->s_flags & MS_POSIXACL)
472 seq_printf(s, ",acl");
473 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
474 seq_printf(s, ",mfsymlinks");
475 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
476 seq_printf(s, ",fsc");
477 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
478 seq_printf(s, ",nostrictsync");
479 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
480 seq_printf(s, ",noperm");
481 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
482 seq_printf(s, ",backupuid=%u",
483 from_kuid_munged(&init_user_ns,
484 cifs_sb->mnt_backupuid));
485 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
486 seq_printf(s, ",backupgid=%u",
487 from_kgid_munged(&init_user_ns,
488 cifs_sb->mnt_backupgid));
490 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
491 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
492 /* convert actimeo and display it in seconds */
493 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
498 static void cifs_umount_begin(struct super_block *sb)
500 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
501 struct cifs_tcon *tcon;
506 tcon = cifs_sb_master_tcon(cifs_sb);
508 spin_lock(&cifs_tcp_ses_lock);
509 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
510 /* we have other mounts to same share or we have
511 already tried to force umount this and woken up
512 all waiting network requests, nothing to do */
513 spin_unlock(&cifs_tcp_ses_lock);
515 } else if (tcon->tc_count == 1)
516 tcon->tidStatus = CifsExiting;
517 spin_unlock(&cifs_tcp_ses_lock);
519 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
520 /* cancel_notify_requests(tcon); */
521 if (tcon->ses && tcon->ses->server) {
522 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
523 wake_up_all(&tcon->ses->server->request_q);
524 wake_up_all(&tcon->ses->server->response_q);
525 msleep(1); /* yield */
526 /* we have to kick the requests once more */
527 wake_up_all(&tcon->ses->server->response_q);
534 #ifdef CONFIG_CIFS_STATS2
535 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
542 static int cifs_remount(struct super_block *sb, int *flags, char *data)
545 *flags |= MS_NODIRATIME;
549 static int cifs_drop_inode(struct inode *inode)
551 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
553 /* no serverino => unconditional eviction */
554 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
555 generic_drop_inode(inode);
558 static const struct super_operations cifs_super_ops = {
559 .statfs = cifs_statfs,
560 .alloc_inode = cifs_alloc_inode,
561 .destroy_inode = cifs_destroy_inode,
562 .drop_inode = cifs_drop_inode,
563 .evict_inode = cifs_evict_inode,
564 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
565 function unless later we add lazy close of inodes or unless the
566 kernel forgets to call us with the same number of releases (closes)
568 .show_options = cifs_show_options,
569 .umount_begin = cifs_umount_begin,
570 .remount_fs = cifs_remount,
571 #ifdef CONFIG_CIFS_STATS2
572 .show_stats = cifs_show_stats,
577 * Get root dentry from superblock according to prefix path mount option.
578 * Return dentry with refcount + 1 on success and NULL otherwise.
580 static struct dentry *
581 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
583 struct dentry *dentry;
584 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
585 char *full_path = NULL;
589 full_path = cifs_build_path_to_root(vol, cifs_sb,
590 cifs_sb_master_tcon(cifs_sb));
591 if (full_path == NULL)
592 return ERR_PTR(-ENOMEM);
594 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
596 sep = CIFS_DIR_SEP(cifs_sb);
597 dentry = dget(sb->s_root);
601 struct inode *dir = dentry->d_inode;
602 struct dentry *child;
606 dentry = ERR_PTR(-ENOENT);
609 if (!S_ISDIR(dir->i_mode)) {
611 dentry = ERR_PTR(-ENOTDIR);
615 /* skip separators */
622 while (*s && *s != sep)
625 mutex_lock(&dir->i_mutex);
626 child = lookup_one_len(p, dentry, s - p);
627 mutex_unlock(&dir->i_mutex);
630 } while (!IS_ERR(dentry));
635 static int cifs_set_super(struct super_block *sb, void *data)
637 struct cifs_mnt_data *mnt_data = data;
638 sb->s_fs_info = mnt_data->cifs_sb;
639 return set_anon_super(sb, NULL);
642 static struct dentry *
643 cifs_do_mount(struct file_system_type *fs_type,
644 int flags, const char *dev_name, void *data)
647 struct super_block *sb;
648 struct cifs_sb_info *cifs_sb;
649 struct smb_vol *volume_info;
650 struct cifs_mnt_data mnt_data;
653 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
655 volume_info = cifs_get_volume_info((char *)data, dev_name);
656 if (IS_ERR(volume_info))
657 return ERR_CAST(volume_info);
659 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
660 if (cifs_sb == NULL) {
661 root = ERR_PTR(-ENOMEM);
665 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
666 if (cifs_sb->mountdata == NULL) {
667 root = ERR_PTR(-ENOMEM);
671 cifs_setup_cifs_sb(volume_info, cifs_sb);
673 rc = cifs_mount(cifs_sb, volume_info);
675 if (!(flags & MS_SILENT))
676 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
682 mnt_data.vol = volume_info;
683 mnt_data.cifs_sb = cifs_sb;
684 mnt_data.flags = flags;
686 /* BB should we make this contingent on mount parm? */
687 flags |= MS_NODIRATIME | MS_NOATIME;
689 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
692 cifs_umount(cifs_sb);
697 cifs_dbg(FYI, "Use existing superblock\n");
698 cifs_umount(cifs_sb);
700 rc = cifs_read_super(sb);
706 sb->s_flags |= MS_ACTIVE;
709 root = cifs_get_root(volume_info, sb);
713 cifs_dbg(FYI, "dentry root is: %p\n", root);
717 deactivate_locked_super(sb);
719 cifs_cleanup_volume_info(volume_info);
723 kfree(cifs_sb->mountdata);
727 unload_nls(volume_info->local_nls);
731 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
732 unsigned long nr_segs, loff_t pos)
734 struct inode *inode = file_inode(iocb->ki_filp);
738 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
740 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
743 rc = filemap_fdatawrite(inode->i_mapping);
745 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
751 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
754 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
755 * the cached file length
757 if (whence != SEEK_SET && whence != SEEK_CUR) {
759 struct inode *inode = file_inode(file);
762 * We need to be sure that all dirty pages are written and the
763 * server has the newest file length.
765 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
766 inode->i_mapping->nrpages != 0) {
767 rc = filemap_fdatawait(inode->i_mapping);
769 mapping_set_error(inode->i_mapping, rc);
774 * Some applications poll for the file length in this strange
775 * way so we must seek to end on non-oplocked files by
776 * setting the revalidate time to zero.
778 CIFS_I(inode)->time = 0;
780 rc = cifs_revalidate_file_attr(file);
784 return generic_file_llseek(file, offset, whence);
787 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
790 * Note that this is called by vfs setlease with i_lock held to
791 * protect *lease from going away.
793 struct inode *inode = file_inode(file);
794 struct cifsFileInfo *cfile = file->private_data;
796 if (!(S_ISREG(inode->i_mode)))
799 /* check if file is oplocked */
800 if (((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
801 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
802 return generic_setlease(file, arg, lease);
803 else if (tlink_tcon(cfile->tlink)->local_lease &&
804 !CIFS_CACHE_READ(CIFS_I(inode)))
806 * If the server claims to support oplock on this file, then we
807 * still need to check oplock even if the local_lease mount
808 * option is set, but there are servers which do not support
809 * oplock for which this mount option may be useful if the user
810 * knows that the file won't be changed on the server by anyone
813 return generic_setlease(file, arg, lease);
818 struct file_system_type cifs_fs_type = {
819 .owner = THIS_MODULE,
821 .mount = cifs_do_mount,
822 .kill_sb = cifs_kill_sb,
825 MODULE_ALIAS_FS("cifs");
826 const struct inode_operations cifs_dir_inode_ops = {
827 .create = cifs_create,
828 .atomic_open = cifs_atomic_open,
829 .lookup = cifs_lookup,
830 .getattr = cifs_getattr,
831 .unlink = cifs_unlink,
832 .link = cifs_hardlink,
835 .rename = cifs_rename,
836 .permission = cifs_permission,
837 /* revalidate:cifs_revalidate, */
838 .setattr = cifs_setattr,
839 .symlink = cifs_symlink,
841 #ifdef CONFIG_CIFS_XATTR
842 .setxattr = cifs_setxattr,
843 .getxattr = cifs_getxattr,
844 .listxattr = cifs_listxattr,
845 .removexattr = cifs_removexattr,
849 const struct inode_operations cifs_file_inode_ops = {
850 /* revalidate:cifs_revalidate, */
851 .setattr = cifs_setattr,
852 .getattr = cifs_getattr, /* do we need this anymore? */
853 .rename = cifs_rename,
854 .permission = cifs_permission,
855 #ifdef CONFIG_CIFS_XATTR
856 .setxattr = cifs_setxattr,
857 .getxattr = cifs_getxattr,
858 .listxattr = cifs_listxattr,
859 .removexattr = cifs_removexattr,
863 const struct inode_operations cifs_symlink_inode_ops = {
864 .readlink = generic_readlink,
865 .follow_link = cifs_follow_link,
866 .put_link = kfree_put_link,
867 .permission = cifs_permission,
868 /* BB add the following two eventually */
869 /* revalidate: cifs_revalidate,
870 setattr: cifs_notify_change, *//* BB do we need notify change */
871 #ifdef CONFIG_CIFS_XATTR
872 .setxattr = cifs_setxattr,
873 .getxattr = cifs_getxattr,
874 .listxattr = cifs_listxattr,
875 .removexattr = cifs_removexattr,
879 const struct file_operations cifs_file_ops = {
880 .read = do_sync_read,
881 .write = do_sync_write,
882 .aio_read = generic_file_aio_read,
883 .aio_write = cifs_file_aio_write,
885 .release = cifs_close,
889 .mmap = cifs_file_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_strict_ops = {
899 .read = do_sync_read,
900 .write = do_sync_write,
901 .aio_read = cifs_strict_readv,
902 .aio_write = cifs_strict_writev,
904 .release = cifs_close,
906 .fsync = cifs_strict_fsync,
908 .mmap = cifs_file_strict_mmap,
909 .splice_read = generic_file_splice_read,
910 .llseek = cifs_llseek,
911 #ifdef CONFIG_CIFS_POSIX
912 .unlocked_ioctl = cifs_ioctl,
913 #endif /* CONFIG_CIFS_POSIX */
914 .setlease = cifs_setlease,
917 const struct file_operations cifs_file_direct_ops = {
918 /* BB reevaluate whether they can be done with directio, no cache */
919 .read = do_sync_read,
920 .write = do_sync_write,
921 .aio_read = cifs_user_readv,
922 .aio_write = cifs_user_writev,
924 .release = cifs_close,
928 .mmap = cifs_file_mmap,
929 .splice_read = generic_file_splice_read,
930 #ifdef CONFIG_CIFS_POSIX
931 .unlocked_ioctl = cifs_ioctl,
932 #endif /* CONFIG_CIFS_POSIX */
933 .llseek = cifs_llseek,
934 .setlease = cifs_setlease,
937 const struct file_operations cifs_file_nobrl_ops = {
938 .read = do_sync_read,
939 .write = do_sync_write,
940 .aio_read = generic_file_aio_read,
941 .aio_write = cifs_file_aio_write,
943 .release = cifs_close,
946 .mmap = cifs_file_mmap,
947 .splice_read = generic_file_splice_read,
948 .llseek = cifs_llseek,
949 #ifdef CONFIG_CIFS_POSIX
950 .unlocked_ioctl = cifs_ioctl,
951 #endif /* CONFIG_CIFS_POSIX */
952 .setlease = cifs_setlease,
955 const struct file_operations cifs_file_strict_nobrl_ops = {
956 .read = do_sync_read,
957 .write = do_sync_write,
958 .aio_read = cifs_strict_readv,
959 .aio_write = cifs_strict_writev,
961 .release = cifs_close,
962 .fsync = cifs_strict_fsync,
964 .mmap = cifs_file_strict_mmap,
965 .splice_read = generic_file_splice_read,
966 .llseek = cifs_llseek,
967 #ifdef CONFIG_CIFS_POSIX
968 .unlocked_ioctl = cifs_ioctl,
969 #endif /* CONFIG_CIFS_POSIX */
970 .setlease = cifs_setlease,
973 const struct file_operations cifs_file_direct_nobrl_ops = {
974 /* BB reevaluate whether they can be done with directio, no cache */
975 .read = do_sync_read,
976 .write = do_sync_write,
977 .aio_read = cifs_user_readv,
978 .aio_write = cifs_user_writev,
980 .release = cifs_close,
983 .mmap = cifs_file_mmap,
984 .splice_read = generic_file_splice_read,
985 #ifdef CONFIG_CIFS_POSIX
986 .unlocked_ioctl = cifs_ioctl,
987 #endif /* CONFIG_CIFS_POSIX */
988 .llseek = cifs_llseek,
989 .setlease = cifs_setlease,
992 const struct file_operations cifs_dir_ops = {
993 .iterate = cifs_readdir,
994 .release = cifs_closedir,
995 .read = generic_read_dir,
996 .unlocked_ioctl = cifs_ioctl,
997 .llseek = generic_file_llseek,
1001 cifs_init_once(void *inode)
1003 struct cifsInodeInfo *cifsi = inode;
1005 inode_init_once(&cifsi->vfs_inode);
1006 init_rwsem(&cifsi->lock_sem);
1010 cifs_init_inodecache(void)
1012 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1013 sizeof(struct cifsInodeInfo),
1014 0, (SLAB_RECLAIM_ACCOUNT|
1017 if (cifs_inode_cachep == NULL)
1024 cifs_destroy_inodecache(void)
1027 * Make sure all delayed rcu free inodes are flushed before we
1031 kmem_cache_destroy(cifs_inode_cachep);
1035 cifs_init_request_bufs(void)
1037 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1038 #ifdef CONFIG_CIFS_SMB2
1040 * SMB2 maximum header size is bigger than CIFS one - no problems to
1041 * allocate some more bytes for CIFS.
1043 max_hdr_size = MAX_SMB2_HDR_SIZE;
1045 if (CIFSMaxBufSize < 8192) {
1046 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1047 Unicode path name has to fit in any SMB/CIFS path based frames */
1048 CIFSMaxBufSize = 8192;
1049 } else if (CIFSMaxBufSize > 1024*127) {
1050 CIFSMaxBufSize = 1024 * 127;
1052 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1055 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1056 CIFSMaxBufSize, CIFSMaxBufSize);
1058 cifs_req_cachep = kmem_cache_create("cifs_request",
1059 CIFSMaxBufSize + max_hdr_size, 0,
1060 SLAB_HWCACHE_ALIGN, NULL);
1061 if (cifs_req_cachep == NULL)
1064 if (cifs_min_rcv < 1)
1066 else if (cifs_min_rcv > 64) {
1068 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1071 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1074 if (cifs_req_poolp == NULL) {
1075 kmem_cache_destroy(cifs_req_cachep);
1078 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1079 almost all handle based requests (but not write response, nor is it
1080 sufficient for path based requests). A smaller size would have
1081 been more efficient (compacting multiple slab items on one 4k page)
1082 for the case in which debug was on, but this larger size allows
1083 more SMBs to use small buffer alloc and is still much more
1084 efficient to alloc 1 per page off the slab compared to 17K (5page)
1085 alloc of large cifs buffers even when page debugging is on */
1086 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1087 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1089 if (cifs_sm_req_cachep == NULL) {
1090 mempool_destroy(cifs_req_poolp);
1091 kmem_cache_destroy(cifs_req_cachep);
1095 if (cifs_min_small < 2)
1097 else if (cifs_min_small > 256) {
1098 cifs_min_small = 256;
1099 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1102 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1103 cifs_sm_req_cachep);
1105 if (cifs_sm_req_poolp == NULL) {
1106 mempool_destroy(cifs_req_poolp);
1107 kmem_cache_destroy(cifs_req_cachep);
1108 kmem_cache_destroy(cifs_sm_req_cachep);
1116 cifs_destroy_request_bufs(void)
1118 mempool_destroy(cifs_req_poolp);
1119 kmem_cache_destroy(cifs_req_cachep);
1120 mempool_destroy(cifs_sm_req_poolp);
1121 kmem_cache_destroy(cifs_sm_req_cachep);
1125 cifs_init_mids(void)
1127 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1128 sizeof(struct mid_q_entry), 0,
1129 SLAB_HWCACHE_ALIGN, NULL);
1130 if (cifs_mid_cachep == NULL)
1133 /* 3 is a reasonable minimum number of simultaneous operations */
1134 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1135 if (cifs_mid_poolp == NULL) {
1136 kmem_cache_destroy(cifs_mid_cachep);
1144 cifs_destroy_mids(void)
1146 mempool_destroy(cifs_mid_poolp);
1147 kmem_cache_destroy(cifs_mid_cachep);
1155 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1156 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1157 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1158 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1159 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1161 * Initialize Global counters
1163 atomic_set(&sesInfoAllocCount, 0);
1164 atomic_set(&tconInfoAllocCount, 0);
1165 atomic_set(&tcpSesAllocCount, 0);
1166 atomic_set(&tcpSesReconnectCount, 0);
1167 atomic_set(&tconInfoReconnectCount, 0);
1169 atomic_set(&bufAllocCount, 0);
1170 atomic_set(&smBufAllocCount, 0);
1171 #ifdef CONFIG_CIFS_STATS2
1172 atomic_set(&totBufAllocCount, 0);
1173 atomic_set(&totSmBufAllocCount, 0);
1174 #endif /* CONFIG_CIFS_STATS2 */
1176 atomic_set(&midCount, 0);
1177 GlobalCurrentXid = 0;
1178 GlobalTotalActiveXid = 0;
1179 GlobalMaxActiveXid = 0;
1180 spin_lock_init(&cifs_tcp_ses_lock);
1181 spin_lock_init(&cifs_file_list_lock);
1182 spin_lock_init(&GlobalMid_Lock);
1184 #ifdef CONFIG_CIFS_SMB2
1185 get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1188 if (cifs_max_pending < 2) {
1189 cifs_max_pending = 2;
1190 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1191 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1192 cifs_max_pending = CIFS_MAX_REQ;
1193 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1197 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1200 goto out_clean_proc;
1203 rc = cifs_fscache_register();
1205 goto out_destroy_wq;
1207 rc = cifs_init_inodecache();
1209 goto out_unreg_fscache;
1211 rc = cifs_init_mids();
1213 goto out_destroy_inodecache;
1215 rc = cifs_init_request_bufs();
1217 goto out_destroy_mids;
1219 #ifdef CONFIG_CIFS_UPCALL
1220 rc = register_key_type(&cifs_spnego_key_type);
1222 goto out_destroy_request_bufs;
1223 #endif /* CONFIG_CIFS_UPCALL */
1225 #ifdef CONFIG_CIFS_ACL
1226 rc = init_cifs_idmap();
1228 goto out_register_key_type;
1229 #endif /* CONFIG_CIFS_ACL */
1231 rc = register_filesystem(&cifs_fs_type);
1233 goto out_init_cifs_idmap;
1237 out_init_cifs_idmap:
1238 #ifdef CONFIG_CIFS_ACL
1240 out_register_key_type:
1242 #ifdef CONFIG_CIFS_UPCALL
1243 unregister_key_type(&cifs_spnego_key_type);
1244 out_destroy_request_bufs:
1246 cifs_destroy_request_bufs();
1248 cifs_destroy_mids();
1249 out_destroy_inodecache:
1250 cifs_destroy_inodecache();
1252 cifs_fscache_unregister();
1254 destroy_workqueue(cifsiod_wq);
1263 cifs_dbg(NOISY, "exit_cifs\n");
1264 unregister_filesystem(&cifs_fs_type);
1265 cifs_dfs_release_automount_timer();
1266 #ifdef CONFIG_CIFS_ACL
1269 #ifdef CONFIG_CIFS_UPCALL
1270 unregister_key_type(&cifs_spnego_key_type);
1272 cifs_destroy_request_bufs();
1273 cifs_destroy_mids();
1274 cifs_destroy_inodecache();
1275 cifs_fscache_unregister();
1276 destroy_workqueue(cifsiod_wq);
1280 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1281 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1283 ("VFS to access servers complying with the SNIA CIFS Specification "
1284 "e.g. Samba and Windows");
1285 MODULE_VERSION(CIFS_VERSION);
1286 module_init(init_cifs)
1287 module_exit(exit_cifs)