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;
91 * Bumps refcount for cifs super block.
92 * Note that it should be only called if a referece to VFS super block is
93 * already held, e.g. in open-type syscalls context. Otherwise it can race with
94 * atomic_dec_and_test in deactivate_locked_super.
97 cifs_sb_active(struct super_block *sb)
99 struct cifs_sb_info *server = CIFS_SB(sb);
101 if (atomic_inc_return(&server->active) == 1)
102 atomic_inc(&sb->s_active);
106 cifs_sb_deactive(struct super_block *sb)
108 struct cifs_sb_info *server = CIFS_SB(sb);
110 if (atomic_dec_and_test(&server->active))
111 deactivate_super(sb);
115 cifs_read_super(struct super_block *sb)
118 struct cifs_sb_info *cifs_sb;
119 struct cifs_tcon *tcon;
122 cifs_sb = CIFS_SB(sb);
123 tcon = cifs_sb_master_tcon(cifs_sb);
125 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
126 sb->s_flags |= MS_POSIXACL;
128 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
129 sb->s_maxbytes = MAX_LFS_FILESIZE;
131 sb->s_maxbytes = MAX_NON_LFS;
133 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
134 sb->s_time_gran = 100;
136 sb->s_magic = CIFS_MAGIC_NUMBER;
137 sb->s_op = &cifs_super_ops;
138 sb->s_bdi = &cifs_sb->bdi;
139 sb->s_blocksize = CIFS_MAX_MSGSIZE;
140 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
141 inode = cifs_root_iget(sb);
149 sb->s_d_op = &cifs_ci_dentry_ops;
151 sb->s_d_op = &cifs_dentry_ops;
153 sb->s_root = d_make_root(inode);
159 #ifdef CONFIG_CIFS_NFSD_EXPORT
160 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
161 cifs_dbg(FYI, "export ops supported\n");
162 sb->s_export_op = &cifs_export_ops;
164 #endif /* CONFIG_CIFS_NFSD_EXPORT */
169 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
173 static void cifs_kill_sb(struct super_block *sb)
175 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
177 cifs_umount(cifs_sb);
181 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
183 struct super_block *sb = dentry->d_sb;
184 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
185 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
186 struct TCP_Server_Info *server = tcon->ses->server;
193 * PATH_MAX may be too long - it would presumably be total path,
194 * but note that some servers (includinng Samba 3) have a shorter
197 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
199 buf->f_namelen = PATH_MAX;
200 buf->f_files = 0; /* undefined */
201 buf->f_ffree = 0; /* unlimited */
203 if (server->ops->queryfs)
204 rc = server->ops->queryfs(xid, tcon, buf);
210 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
212 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
213 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
214 struct TCP_Server_Info *server = tcon->ses->server;
216 if (server->ops->fallocate)
217 return server->ops->fallocate(file, tcon, mode, off, len);
222 static int cifs_permission(struct inode *inode, int mask)
224 struct cifs_sb_info *cifs_sb;
226 cifs_sb = CIFS_SB(inode->i_sb);
228 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
229 if ((mask & MAY_EXEC) && !execute_ok(inode))
233 } else /* file mode might have been restricted at mount time
234 on the client (above and beyond ACL on servers) for
235 servers which do not support setting and viewing mode bits,
236 so allowing client to check permissions is useful */
237 return generic_permission(inode, mask);
240 static struct kmem_cache *cifs_inode_cachep;
241 static struct kmem_cache *cifs_req_cachep;
242 static struct kmem_cache *cifs_mid_cachep;
243 static struct kmem_cache *cifs_sm_req_cachep;
244 mempool_t *cifs_sm_req_poolp;
245 mempool_t *cifs_req_poolp;
246 mempool_t *cifs_mid_poolp;
248 static struct inode *
249 cifs_alloc_inode(struct super_block *sb)
251 struct cifsInodeInfo *cifs_inode;
252 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
255 cifs_inode->cifsAttrs = 0x20; /* default */
256 cifs_inode->time = 0;
258 * Until the file is open and we have gotten oplock info back from the
259 * server, can not assume caching of file data or metadata.
261 cifs_set_oplock_level(cifs_inode, 0);
262 cifs_inode->flags = 0;
263 spin_lock_init(&cifs_inode->writers_lock);
264 cifs_inode->writers = 0;
265 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
266 cifs_inode->server_eof = 0;
267 cifs_inode->uniqueid = 0;
268 cifs_inode->createtime = 0;
269 cifs_inode->epoch = 0;
270 #ifdef CONFIG_CIFS_SMB2
271 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
274 * Can not set i_flags here - they get immediately overwritten to zero
277 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
278 INIT_LIST_HEAD(&cifs_inode->openFileList);
279 INIT_LIST_HEAD(&cifs_inode->llist);
280 return &cifs_inode->vfs_inode;
283 static void cifs_i_callback(struct rcu_head *head)
285 struct inode *inode = container_of(head, struct inode, i_rcu);
286 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
290 cifs_destroy_inode(struct inode *inode)
292 call_rcu(&inode->i_rcu, cifs_i_callback);
296 cifs_evict_inode(struct inode *inode)
298 truncate_inode_pages_final(&inode->i_data);
300 cifs_fscache_release_inode_cookie(inode);
304 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
306 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
307 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
309 seq_puts(s, ",addr=");
311 switch (server->dstaddr.ss_family) {
313 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
316 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
317 if (sa6->sin6_scope_id)
318 seq_printf(s, "%%%u", sa6->sin6_scope_id);
321 seq_puts(s, "(unknown)");
326 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
328 if (ses->sectype == Unspecified) {
329 if (ses->user_name == NULL)
330 seq_puts(s, ",sec=none");
334 seq_puts(s, ",sec=");
336 switch (ses->sectype) {
338 seq_puts(s, "lanman");
341 seq_puts(s, "ntlmv2");
350 seq_puts(s, "ntlmssp");
353 /* shouldn't ever happen */
354 seq_puts(s, "unknown");
363 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
365 seq_puts(s, ",cache=");
367 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
368 seq_puts(s, "strict");
369 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
372 seq_puts(s, "loose");
376 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
378 struct nls_table *def;
380 /* Display iocharset= option if it's not default charset */
381 def = load_nls_default();
383 seq_printf(s, ",iocharset=%s", cur->charset);
388 * cifs_show_options() is for displaying mount options in /proc/mounts.
389 * Not all settable options are displayed but most of the important
393 cifs_show_options(struct seq_file *s, struct dentry *root)
395 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
396 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
397 struct sockaddr *srcaddr;
398 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
400 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
401 cifs_show_security(s, tcon->ses);
402 cifs_show_cache_flavor(s, cifs_sb);
404 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
405 seq_puts(s, ",multiuser");
406 else if (tcon->ses->user_name)
407 seq_show_option(s, "username", tcon->ses->user_name);
409 if (tcon->ses->domainName)
410 seq_show_option(s, "domain", tcon->ses->domainName);
412 if (srcaddr->sa_family != AF_UNSPEC) {
413 struct sockaddr_in *saddr4;
414 struct sockaddr_in6 *saddr6;
415 saddr4 = (struct sockaddr_in *)srcaddr;
416 saddr6 = (struct sockaddr_in6 *)srcaddr;
417 if (srcaddr->sa_family == AF_INET6)
418 seq_printf(s, ",srcaddr=%pI6c",
420 else if (srcaddr->sa_family == AF_INET)
421 seq_printf(s, ",srcaddr=%pI4",
422 &saddr4->sin_addr.s_addr);
424 seq_printf(s, ",srcaddr=BAD-AF:%i",
425 (int)(srcaddr->sa_family));
428 seq_printf(s, ",uid=%u",
429 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
430 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
431 seq_puts(s, ",forceuid");
433 seq_puts(s, ",noforceuid");
435 seq_printf(s, ",gid=%u",
436 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
437 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
438 seq_puts(s, ",forcegid");
440 seq_puts(s, ",noforcegid");
442 cifs_show_address(s, tcon->ses->server);
445 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
446 cifs_sb->mnt_file_mode,
447 cifs_sb->mnt_dir_mode);
449 cifs_show_nls(s, cifs_sb->local_nls);
452 seq_puts(s, ",seal");
454 seq_puts(s, ",nocase");
456 seq_puts(s, ",hard");
457 if (tcon->use_persistent)
458 seq_puts(s, ",persistenthandles");
460 seq_puts(s, ",unix");
462 seq_puts(s, ",nounix");
463 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
464 seq_puts(s, ",posixpaths");
465 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
466 seq_puts(s, ",setuids");
467 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
468 seq_puts(s, ",serverino");
469 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
470 seq_puts(s, ",rwpidforward");
471 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
472 seq_puts(s, ",forcemand");
473 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
474 seq_puts(s, ",nouser_xattr");
475 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
476 seq_puts(s, ",mapchars");
477 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
478 seq_puts(s, ",mapposix");
479 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
481 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
482 seq_puts(s, ",nobrl");
483 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
484 seq_puts(s, ",cifsacl");
485 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
486 seq_puts(s, ",dynperm");
487 if (root->d_sb->s_flags & MS_POSIXACL)
489 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
490 seq_puts(s, ",mfsymlinks");
491 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
493 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
494 seq_puts(s, ",nostrictsync");
495 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
496 seq_puts(s, ",noperm");
497 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
498 seq_printf(s, ",backupuid=%u",
499 from_kuid_munged(&init_user_ns,
500 cifs_sb->mnt_backupuid));
501 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
502 seq_printf(s, ",backupgid=%u",
503 from_kgid_munged(&init_user_ns,
504 cifs_sb->mnt_backupgid));
506 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
507 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
508 /* convert actimeo and display it in seconds */
509 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
514 static void cifs_umount_begin(struct super_block *sb)
516 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
517 struct cifs_tcon *tcon;
522 tcon = cifs_sb_master_tcon(cifs_sb);
524 spin_lock(&cifs_tcp_ses_lock);
525 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
526 /* we have other mounts to same share or we have
527 already tried to force umount this and woken up
528 all waiting network requests, nothing to do */
529 spin_unlock(&cifs_tcp_ses_lock);
531 } else if (tcon->tc_count == 1)
532 tcon->tidStatus = CifsExiting;
533 spin_unlock(&cifs_tcp_ses_lock);
535 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
536 /* cancel_notify_requests(tcon); */
537 if (tcon->ses && tcon->ses->server) {
538 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
539 wake_up_all(&tcon->ses->server->request_q);
540 wake_up_all(&tcon->ses->server->response_q);
541 msleep(1); /* yield */
542 /* we have to kick the requests once more */
543 wake_up_all(&tcon->ses->server->response_q);
550 #ifdef CONFIG_CIFS_STATS2
551 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
558 static int cifs_remount(struct super_block *sb, int *flags, char *data)
561 *flags |= MS_NODIRATIME;
565 static int cifs_drop_inode(struct inode *inode)
567 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
569 /* no serverino => unconditional eviction */
570 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
571 generic_drop_inode(inode);
574 static const struct super_operations cifs_super_ops = {
575 .statfs = cifs_statfs,
576 .alloc_inode = cifs_alloc_inode,
577 .destroy_inode = cifs_destroy_inode,
578 .drop_inode = cifs_drop_inode,
579 .evict_inode = cifs_evict_inode,
580 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
581 function unless later we add lazy close of inodes or unless the
582 kernel forgets to call us with the same number of releases (closes)
584 .show_options = cifs_show_options,
585 .umount_begin = cifs_umount_begin,
586 .remount_fs = cifs_remount,
587 #ifdef CONFIG_CIFS_STATS2
588 .show_stats = cifs_show_stats,
593 * Get root dentry from superblock according to prefix path mount option.
594 * Return dentry with refcount + 1 on success and NULL otherwise.
596 static struct dentry *
597 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
599 struct dentry *dentry;
600 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
601 char *full_path = NULL;
605 full_path = cifs_build_path_to_root(vol, cifs_sb,
606 cifs_sb_master_tcon(cifs_sb));
607 if (full_path == NULL)
608 return ERR_PTR(-ENOMEM);
610 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
612 sep = CIFS_DIR_SEP(cifs_sb);
613 dentry = dget(sb->s_root);
617 struct inode *dir = d_inode(dentry);
618 struct dentry *child;
622 dentry = ERR_PTR(-ENOENT);
625 if (!S_ISDIR(dir->i_mode)) {
627 dentry = ERR_PTR(-ENOTDIR);
631 /* skip separators */
638 while (*s && *s != sep)
641 mutex_lock(&dir->i_mutex);
642 child = lookup_one_len(p, dentry, s - p);
643 mutex_unlock(&dir->i_mutex);
646 } while (!IS_ERR(dentry));
651 static int cifs_set_super(struct super_block *sb, void *data)
653 struct cifs_mnt_data *mnt_data = data;
654 sb->s_fs_info = mnt_data->cifs_sb;
655 return set_anon_super(sb, NULL);
658 static struct dentry *
659 cifs_do_mount(struct file_system_type *fs_type,
660 int flags, const char *dev_name, void *data)
663 struct super_block *sb;
664 struct cifs_sb_info *cifs_sb;
665 struct smb_vol *volume_info;
666 struct cifs_mnt_data mnt_data;
669 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
671 volume_info = cifs_get_volume_info((char *)data, dev_name);
672 if (IS_ERR(volume_info))
673 return ERR_CAST(volume_info);
675 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
676 if (cifs_sb == NULL) {
677 root = ERR_PTR(-ENOMEM);
681 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
682 if (cifs_sb->mountdata == NULL) {
683 root = ERR_PTR(-ENOMEM);
687 cifs_setup_cifs_sb(volume_info, cifs_sb);
689 rc = cifs_mount(cifs_sb, volume_info);
691 if (!(flags & MS_SILENT))
692 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
698 mnt_data.vol = volume_info;
699 mnt_data.cifs_sb = cifs_sb;
700 mnt_data.flags = flags;
702 /* BB should we make this contingent on mount parm? */
703 flags |= MS_NODIRATIME | MS_NOATIME;
705 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
708 cifs_umount(cifs_sb);
713 cifs_dbg(FYI, "Use existing superblock\n");
714 cifs_umount(cifs_sb);
716 rc = cifs_read_super(sb);
722 sb->s_flags |= MS_ACTIVE;
725 root = cifs_get_root(volume_info, sb);
729 cifs_dbg(FYI, "dentry root is: %p\n", root);
733 deactivate_locked_super(sb);
735 cifs_cleanup_volume_info(volume_info);
739 kfree(cifs_sb->mountdata);
743 unload_nls(volume_info->local_nls);
748 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
751 struct inode *inode = file_inode(iocb->ki_filp);
753 rc = cifs_revalidate_mapping(inode);
757 return generic_file_read_iter(iocb, iter);
760 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
762 struct inode *inode = file_inode(iocb->ki_filp);
763 struct cifsInodeInfo *cinode = CIFS_I(inode);
767 written = cifs_get_writer(cinode);
771 written = generic_file_write_iter(iocb, from);
773 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
776 rc = filemap_fdatawrite(inode->i_mapping);
778 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
782 cifs_put_writer(cinode);
786 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
789 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
790 * the cached file length
792 if (whence != SEEK_SET && whence != SEEK_CUR) {
794 struct inode *inode = file_inode(file);
797 * We need to be sure that all dirty pages are written and the
798 * server has the newest file length.
800 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
801 inode->i_mapping->nrpages != 0) {
802 rc = filemap_fdatawait(inode->i_mapping);
804 mapping_set_error(inode->i_mapping, rc);
809 * Some applications poll for the file length in this strange
810 * way so we must seek to end on non-oplocked files by
811 * setting the revalidate time to zero.
813 CIFS_I(inode)->time = 0;
815 rc = cifs_revalidate_file_attr(file);
819 return generic_file_llseek(file, offset, whence);
823 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
826 * Note that this is called by vfs setlease with i_lock held to
827 * protect *lease from going away.
829 struct inode *inode = file_inode(file);
830 struct cifsFileInfo *cfile = file->private_data;
832 if (!(S_ISREG(inode->i_mode)))
835 /* Check if file is oplocked if this is request for new lease */
836 if (arg == F_UNLCK ||
837 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
838 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
839 return generic_setlease(file, arg, lease, priv);
840 else if (tlink_tcon(cfile->tlink)->local_lease &&
841 !CIFS_CACHE_READ(CIFS_I(inode)))
843 * If the server claims to support oplock on this file, then we
844 * still need to check oplock even if the local_lease mount
845 * option is set, but there are servers which do not support
846 * oplock for which this mount option may be useful if the user
847 * knows that the file won't be changed on the server by anyone
850 return generic_setlease(file, arg, lease, priv);
855 struct file_system_type cifs_fs_type = {
856 .owner = THIS_MODULE,
858 .mount = cifs_do_mount,
859 .kill_sb = cifs_kill_sb,
862 MODULE_ALIAS_FS("cifs");
863 const struct inode_operations cifs_dir_inode_ops = {
864 .create = cifs_create,
865 .atomic_open = cifs_atomic_open,
866 .lookup = cifs_lookup,
867 .getattr = cifs_getattr,
868 .unlink = cifs_unlink,
869 .link = cifs_hardlink,
872 .rename2 = cifs_rename2,
873 .permission = cifs_permission,
874 /* revalidate:cifs_revalidate, */
875 .setattr = cifs_setattr,
876 .symlink = cifs_symlink,
878 #ifdef CONFIG_CIFS_XATTR
879 .setxattr = cifs_setxattr,
880 .getxattr = cifs_getxattr,
881 .listxattr = cifs_listxattr,
882 .removexattr = cifs_removexattr,
886 const struct inode_operations cifs_file_inode_ops = {
887 /* revalidate:cifs_revalidate, */
888 .setattr = cifs_setattr,
889 .getattr = cifs_getattr, /* do we need this anymore? */
890 .permission = cifs_permission,
891 #ifdef CONFIG_CIFS_XATTR
892 .setxattr = cifs_setxattr,
893 .getxattr = cifs_getxattr,
894 .listxattr = cifs_listxattr,
895 .removexattr = cifs_removexattr,
899 const struct inode_operations cifs_symlink_inode_ops = {
900 .readlink = generic_readlink,
901 .follow_link = cifs_follow_link,
902 .put_link = kfree_put_link,
903 .permission = cifs_permission,
904 /* BB add the following two eventually */
905 /* revalidate: cifs_revalidate,
906 setattr: cifs_notify_change, *//* BB do we need notify change */
907 #ifdef CONFIG_CIFS_XATTR
908 .setxattr = cifs_setxattr,
909 .getxattr = cifs_getxattr,
910 .listxattr = cifs_listxattr,
911 .removexattr = cifs_removexattr,
915 const struct file_operations cifs_file_ops = {
916 .read_iter = cifs_loose_read_iter,
917 .write_iter = cifs_file_write_iter,
919 .release = cifs_close,
923 .mmap = cifs_file_mmap,
924 .splice_read = generic_file_splice_read,
925 .llseek = cifs_llseek,
926 #ifdef CONFIG_CIFS_POSIX
927 .unlocked_ioctl = cifs_ioctl,
928 #endif /* CONFIG_CIFS_POSIX */
929 .setlease = cifs_setlease,
930 .fallocate = cifs_fallocate,
933 const struct file_operations cifs_file_strict_ops = {
934 .read_iter = cifs_strict_readv,
935 .write_iter = cifs_strict_writev,
937 .release = cifs_close,
939 .fsync = cifs_strict_fsync,
941 .mmap = cifs_file_strict_mmap,
942 .splice_read = generic_file_splice_read,
943 .llseek = cifs_llseek,
944 #ifdef CONFIG_CIFS_POSIX
945 .unlocked_ioctl = cifs_ioctl,
946 #endif /* CONFIG_CIFS_POSIX */
947 .setlease = cifs_setlease,
948 .fallocate = cifs_fallocate,
951 const struct file_operations cifs_file_direct_ops = {
952 /* BB reevaluate whether they can be done with directio, no cache */
953 .read_iter = cifs_user_readv,
954 .write_iter = cifs_user_writev,
956 .release = cifs_close,
960 .mmap = cifs_file_mmap,
961 .splice_read = generic_file_splice_read,
962 #ifdef CONFIG_CIFS_POSIX
963 .unlocked_ioctl = cifs_ioctl,
964 #endif /* CONFIG_CIFS_POSIX */
965 .llseek = cifs_llseek,
966 .setlease = cifs_setlease,
967 .fallocate = cifs_fallocate,
970 const struct file_operations cifs_file_nobrl_ops = {
971 .read_iter = cifs_loose_read_iter,
972 .write_iter = cifs_file_write_iter,
974 .release = cifs_close,
977 .mmap = cifs_file_mmap,
978 .splice_read = generic_file_splice_read,
979 .llseek = cifs_llseek,
980 #ifdef CONFIG_CIFS_POSIX
981 .unlocked_ioctl = cifs_ioctl,
982 #endif /* CONFIG_CIFS_POSIX */
983 .setlease = cifs_setlease,
984 .fallocate = cifs_fallocate,
987 const struct file_operations cifs_file_strict_nobrl_ops = {
988 .read_iter = cifs_strict_readv,
989 .write_iter = cifs_strict_writev,
991 .release = cifs_close,
992 .fsync = cifs_strict_fsync,
994 .mmap = cifs_file_strict_mmap,
995 .splice_read = generic_file_splice_read,
996 .llseek = cifs_llseek,
997 #ifdef CONFIG_CIFS_POSIX
998 .unlocked_ioctl = cifs_ioctl,
999 #endif /* CONFIG_CIFS_POSIX */
1000 .setlease = cifs_setlease,
1001 .fallocate = cifs_fallocate,
1004 const struct file_operations cifs_file_direct_nobrl_ops = {
1005 /* BB reevaluate whether they can be done with directio, no cache */
1006 .read_iter = cifs_user_readv,
1007 .write_iter = cifs_user_writev,
1009 .release = cifs_close,
1010 .fsync = cifs_fsync,
1011 .flush = cifs_flush,
1012 .mmap = cifs_file_mmap,
1013 .splice_read = generic_file_splice_read,
1014 #ifdef CONFIG_CIFS_POSIX
1015 .unlocked_ioctl = cifs_ioctl,
1016 #endif /* CONFIG_CIFS_POSIX */
1017 .llseek = cifs_llseek,
1018 .setlease = cifs_setlease,
1019 .fallocate = cifs_fallocate,
1022 const struct file_operations cifs_dir_ops = {
1023 .iterate = cifs_readdir,
1024 .release = cifs_closedir,
1025 .read = generic_read_dir,
1026 .unlocked_ioctl = cifs_ioctl,
1027 .llseek = generic_file_llseek,
1031 cifs_init_once(void *inode)
1033 struct cifsInodeInfo *cifsi = inode;
1035 inode_init_once(&cifsi->vfs_inode);
1036 init_rwsem(&cifsi->lock_sem);
1040 cifs_init_inodecache(void)
1042 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1043 sizeof(struct cifsInodeInfo),
1044 0, (SLAB_RECLAIM_ACCOUNT|
1047 if (cifs_inode_cachep == NULL)
1054 cifs_destroy_inodecache(void)
1057 * Make sure all delayed rcu free inodes are flushed before we
1061 kmem_cache_destroy(cifs_inode_cachep);
1065 cifs_init_request_bufs(void)
1067 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1068 #ifdef CONFIG_CIFS_SMB2
1070 * SMB2 maximum header size is bigger than CIFS one - no problems to
1071 * allocate some more bytes for CIFS.
1073 max_hdr_size = MAX_SMB2_HDR_SIZE;
1075 if (CIFSMaxBufSize < 8192) {
1076 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1077 Unicode path name has to fit in any SMB/CIFS path based frames */
1078 CIFSMaxBufSize = 8192;
1079 } else if (CIFSMaxBufSize > 1024*127) {
1080 CIFSMaxBufSize = 1024 * 127;
1082 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1085 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1086 CIFSMaxBufSize, CIFSMaxBufSize);
1088 cifs_req_cachep = kmem_cache_create("cifs_request",
1089 CIFSMaxBufSize + max_hdr_size, 0,
1090 SLAB_HWCACHE_ALIGN, NULL);
1091 if (cifs_req_cachep == NULL)
1094 if (cifs_min_rcv < 1)
1096 else if (cifs_min_rcv > 64) {
1098 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1101 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1104 if (cifs_req_poolp == NULL) {
1105 kmem_cache_destroy(cifs_req_cachep);
1108 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1109 almost all handle based requests (but not write response, nor is it
1110 sufficient for path based requests). A smaller size would have
1111 been more efficient (compacting multiple slab items on one 4k page)
1112 for the case in which debug was on, but this larger size allows
1113 more SMBs to use small buffer alloc and is still much more
1114 efficient to alloc 1 per page off the slab compared to 17K (5page)
1115 alloc of large cifs buffers even when page debugging is on */
1116 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1117 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1119 if (cifs_sm_req_cachep == NULL) {
1120 mempool_destroy(cifs_req_poolp);
1121 kmem_cache_destroy(cifs_req_cachep);
1125 if (cifs_min_small < 2)
1127 else if (cifs_min_small > 256) {
1128 cifs_min_small = 256;
1129 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1132 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1133 cifs_sm_req_cachep);
1135 if (cifs_sm_req_poolp == NULL) {
1136 mempool_destroy(cifs_req_poolp);
1137 kmem_cache_destroy(cifs_req_cachep);
1138 kmem_cache_destroy(cifs_sm_req_cachep);
1146 cifs_destroy_request_bufs(void)
1148 mempool_destroy(cifs_req_poolp);
1149 kmem_cache_destroy(cifs_req_cachep);
1150 mempool_destroy(cifs_sm_req_poolp);
1151 kmem_cache_destroy(cifs_sm_req_cachep);
1155 cifs_init_mids(void)
1157 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1158 sizeof(struct mid_q_entry), 0,
1159 SLAB_HWCACHE_ALIGN, NULL);
1160 if (cifs_mid_cachep == NULL)
1163 /* 3 is a reasonable minimum number of simultaneous operations */
1164 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1165 if (cifs_mid_poolp == NULL) {
1166 kmem_cache_destroy(cifs_mid_cachep);
1174 cifs_destroy_mids(void)
1176 mempool_destroy(cifs_mid_poolp);
1177 kmem_cache_destroy(cifs_mid_cachep);
1185 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1186 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1187 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1188 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1189 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1191 * Initialize Global counters
1193 atomic_set(&sesInfoAllocCount, 0);
1194 atomic_set(&tconInfoAllocCount, 0);
1195 atomic_set(&tcpSesAllocCount, 0);
1196 atomic_set(&tcpSesReconnectCount, 0);
1197 atomic_set(&tconInfoReconnectCount, 0);
1199 atomic_set(&bufAllocCount, 0);
1200 atomic_set(&smBufAllocCount, 0);
1201 #ifdef CONFIG_CIFS_STATS2
1202 atomic_set(&totBufAllocCount, 0);
1203 atomic_set(&totSmBufAllocCount, 0);
1204 #endif /* CONFIG_CIFS_STATS2 */
1206 atomic_set(&midCount, 0);
1207 GlobalCurrentXid = 0;
1208 GlobalTotalActiveXid = 0;
1209 GlobalMaxActiveXid = 0;
1210 spin_lock_init(&cifs_tcp_ses_lock);
1211 spin_lock_init(&cifs_file_list_lock);
1212 spin_lock_init(&GlobalMid_Lock);
1214 if (cifs_max_pending < 2) {
1215 cifs_max_pending = 2;
1216 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1217 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1218 cifs_max_pending = CIFS_MAX_REQ;
1219 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1223 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1226 goto out_clean_proc;
1229 rc = cifs_fscache_register();
1231 goto out_destroy_wq;
1233 rc = cifs_init_inodecache();
1235 goto out_unreg_fscache;
1237 rc = cifs_init_mids();
1239 goto out_destroy_inodecache;
1241 rc = cifs_init_request_bufs();
1243 goto out_destroy_mids;
1245 #ifdef CONFIG_CIFS_UPCALL
1246 rc = register_key_type(&cifs_spnego_key_type);
1248 goto out_destroy_request_bufs;
1249 #endif /* CONFIG_CIFS_UPCALL */
1251 #ifdef CONFIG_CIFS_ACL
1252 rc = init_cifs_idmap();
1254 goto out_register_key_type;
1255 #endif /* CONFIG_CIFS_ACL */
1257 rc = register_filesystem(&cifs_fs_type);
1259 goto out_init_cifs_idmap;
1263 out_init_cifs_idmap:
1264 #ifdef CONFIG_CIFS_ACL
1266 out_register_key_type:
1268 #ifdef CONFIG_CIFS_UPCALL
1269 unregister_key_type(&cifs_spnego_key_type);
1270 out_destroy_request_bufs:
1272 cifs_destroy_request_bufs();
1274 cifs_destroy_mids();
1275 out_destroy_inodecache:
1276 cifs_destroy_inodecache();
1278 cifs_fscache_unregister();
1280 destroy_workqueue(cifsiod_wq);
1289 cifs_dbg(NOISY, "exit_cifs\n");
1290 unregister_filesystem(&cifs_fs_type);
1291 cifs_dfs_release_automount_timer();
1292 #ifdef CONFIG_CIFS_ACL
1295 #ifdef CONFIG_CIFS_UPCALL
1296 unregister_key_type(&cifs_spnego_key_type);
1298 cifs_destroy_request_bufs();
1299 cifs_destroy_mids();
1300 cifs_destroy_inodecache();
1301 cifs_fscache_unregister();
1302 destroy_workqueue(cifsiod_wq);
1306 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1307 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1309 ("VFS to access servers complying with the SNIA CIFS Specification "
1310 "e.g. Samba and Windows");
1311 MODULE_VERSION(CIFS_VERSION);
1312 module_init(init_cifs)
1313 module_exit(exit_cifs)