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)
524 *flags |= MS_NODIRATIME;
528 static int cifs_drop_inode(struct inode *inode)
530 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
532 /* no serverino => unconditional eviction */
533 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
534 generic_drop_inode(inode);
537 static const struct super_operations cifs_super_ops = {
538 .statfs = cifs_statfs,
539 .alloc_inode = cifs_alloc_inode,
540 .destroy_inode = cifs_destroy_inode,
541 .drop_inode = cifs_drop_inode,
542 .evict_inode = cifs_evict_inode,
543 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
544 function unless later we add lazy close of inodes or unless the
545 kernel forgets to call us with the same number of releases (closes)
547 .show_options = cifs_show_options,
548 .umount_begin = cifs_umount_begin,
549 .remount_fs = cifs_remount,
550 #ifdef CONFIG_CIFS_STATS2
551 .show_stats = cifs_show_stats,
556 * Get root dentry from superblock according to prefix path mount option.
557 * Return dentry with refcount + 1 on success and NULL otherwise.
559 static struct dentry *
560 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
562 struct dentry *dentry;
563 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
564 char *full_path = NULL;
568 full_path = cifs_build_path_to_root(vol, cifs_sb,
569 cifs_sb_master_tcon(cifs_sb));
570 if (full_path == NULL)
571 return ERR_PTR(-ENOMEM);
573 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
575 sep = CIFS_DIR_SEP(cifs_sb);
576 dentry = dget(sb->s_root);
580 struct inode *dir = dentry->d_inode;
581 struct dentry *child;
585 dentry = ERR_PTR(-ENOENT);
588 if (!S_ISDIR(dir->i_mode)) {
590 dentry = ERR_PTR(-ENOTDIR);
594 /* skip separators */
601 while (*s && *s != sep)
604 mutex_lock(&dir->i_mutex);
605 child = lookup_one_len(p, dentry, s - p);
606 mutex_unlock(&dir->i_mutex);
609 } while (!IS_ERR(dentry));
614 static int cifs_set_super(struct super_block *sb, void *data)
616 struct cifs_mnt_data *mnt_data = data;
617 sb->s_fs_info = mnt_data->cifs_sb;
618 return set_anon_super(sb, NULL);
621 static struct dentry *
622 cifs_do_mount(struct file_system_type *fs_type,
623 int flags, const char *dev_name, void *data)
626 struct super_block *sb;
627 struct cifs_sb_info *cifs_sb;
628 struct smb_vol *volume_info;
629 struct cifs_mnt_data mnt_data;
632 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
634 volume_info = cifs_get_volume_info((char *)data, dev_name);
635 if (IS_ERR(volume_info))
636 return ERR_CAST(volume_info);
638 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
639 if (cifs_sb == NULL) {
640 root = ERR_PTR(-ENOMEM);
644 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
645 if (cifs_sb->mountdata == NULL) {
646 root = ERR_PTR(-ENOMEM);
650 cifs_setup_cifs_sb(volume_info, cifs_sb);
652 rc = cifs_mount(cifs_sb, volume_info);
654 if (!(flags & MS_SILENT))
655 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
661 mnt_data.vol = volume_info;
662 mnt_data.cifs_sb = cifs_sb;
663 mnt_data.flags = flags;
665 /* BB should we make this contingent on mount parm? */
666 flags |= MS_NODIRATIME | MS_NOATIME;
668 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
671 cifs_umount(cifs_sb);
676 cifs_dbg(FYI, "Use existing superblock\n");
677 cifs_umount(cifs_sb);
679 rc = cifs_read_super(sb);
685 sb->s_flags |= MS_ACTIVE;
688 root = cifs_get_root(volume_info, sb);
692 cifs_dbg(FYI, "dentry root is: %p\n", root);
696 deactivate_locked_super(sb);
698 cifs_cleanup_volume_info(volume_info);
702 kfree(cifs_sb->mountdata);
706 unload_nls(volume_info->local_nls);
710 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
711 unsigned long nr_segs, loff_t pos)
713 struct inode *inode = file_inode(iocb->ki_filp);
717 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
719 if (CIFS_I(inode)->clientCanCacheAll)
722 rc = filemap_fdatawrite(inode->i_mapping);
724 cifs_dbg(FYI, "cifs_file_aio_write: %d rc on %p inode\n",
730 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
733 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
734 * the cached file length
736 if (whence != SEEK_SET && whence != SEEK_CUR) {
738 struct inode *inode = file_inode(file);
741 * We need to be sure that all dirty pages are written and the
742 * server has the newest file length.
744 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
745 inode->i_mapping->nrpages != 0) {
746 rc = filemap_fdatawait(inode->i_mapping);
748 mapping_set_error(inode->i_mapping, rc);
753 * Some applications poll for the file length in this strange
754 * way so we must seek to end on non-oplocked files by
755 * setting the revalidate time to zero.
757 CIFS_I(inode)->time = 0;
759 rc = cifs_revalidate_file_attr(file);
763 return generic_file_llseek(file, offset, whence);
766 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
768 /* note that this is called by vfs setlease with lock_flocks held
769 to protect *lease from going away */
770 struct inode *inode = file_inode(file);
771 struct cifsFileInfo *cfile = file->private_data;
773 if (!(S_ISREG(inode->i_mode)))
776 /* check if file is oplocked */
777 if (((arg == F_RDLCK) &&
778 (CIFS_I(inode)->clientCanCacheRead)) ||
780 (CIFS_I(inode)->clientCanCacheAll)))
781 return generic_setlease(file, arg, lease);
782 else if (tlink_tcon(cfile->tlink)->local_lease &&
783 !CIFS_I(inode)->clientCanCacheRead)
784 /* If the server claims to support oplock on this
785 file, then we still need to check oplock even
786 if the local_lease mount option is set, but there
787 are servers which do not support oplock for which
788 this mount option may be useful if the user
789 knows that the file won't be changed on the server
791 return generic_setlease(file, arg, lease);
796 struct file_system_type cifs_fs_type = {
797 .owner = THIS_MODULE,
799 .mount = cifs_do_mount,
800 .kill_sb = cifs_kill_sb,
803 MODULE_ALIAS_FS("cifs");
804 const struct inode_operations cifs_dir_inode_ops = {
805 .create = cifs_create,
806 .atomic_open = cifs_atomic_open,
807 .lookup = cifs_lookup,
808 .getattr = cifs_getattr,
809 .unlink = cifs_unlink,
810 .link = cifs_hardlink,
813 .rename = cifs_rename,
814 .permission = cifs_permission,
815 /* revalidate:cifs_revalidate, */
816 .setattr = cifs_setattr,
817 .symlink = cifs_symlink,
819 #ifdef CONFIG_CIFS_XATTR
820 .setxattr = cifs_setxattr,
821 .getxattr = cifs_getxattr,
822 .listxattr = cifs_listxattr,
823 .removexattr = cifs_removexattr,
827 const struct inode_operations cifs_file_inode_ops = {
828 /* revalidate:cifs_revalidate, */
829 .setattr = cifs_setattr,
830 .getattr = cifs_getattr, /* do we need this anymore? */
831 .rename = cifs_rename,
832 .permission = cifs_permission,
833 #ifdef CONFIG_CIFS_XATTR
834 .setxattr = cifs_setxattr,
835 .getxattr = cifs_getxattr,
836 .listxattr = cifs_listxattr,
837 .removexattr = cifs_removexattr,
841 const struct inode_operations cifs_symlink_inode_ops = {
842 .readlink = generic_readlink,
843 .follow_link = cifs_follow_link,
844 .put_link = cifs_put_link,
845 .permission = cifs_permission,
846 /* BB add the following two eventually */
847 /* revalidate: cifs_revalidate,
848 setattr: cifs_notify_change, *//* BB do we need notify change */
849 #ifdef CONFIG_CIFS_XATTR
850 .setxattr = cifs_setxattr,
851 .getxattr = cifs_getxattr,
852 .listxattr = cifs_listxattr,
853 .removexattr = cifs_removexattr,
857 const struct file_operations cifs_file_ops = {
858 .read = do_sync_read,
859 .write = do_sync_write,
860 .aio_read = generic_file_aio_read,
861 .aio_write = cifs_file_aio_write,
863 .release = cifs_close,
867 .mmap = cifs_file_mmap,
868 .splice_read = generic_file_splice_read,
869 .llseek = cifs_llseek,
870 #ifdef CONFIG_CIFS_POSIX
871 .unlocked_ioctl = cifs_ioctl,
872 #endif /* CONFIG_CIFS_POSIX */
873 .setlease = cifs_setlease,
876 const struct file_operations cifs_file_strict_ops = {
877 .read = do_sync_read,
878 .write = do_sync_write,
879 .aio_read = cifs_strict_readv,
880 .aio_write = cifs_strict_writev,
882 .release = cifs_close,
884 .fsync = cifs_strict_fsync,
886 .mmap = cifs_file_strict_mmap,
887 .splice_read = generic_file_splice_read,
888 .llseek = cifs_llseek,
889 #ifdef CONFIG_CIFS_POSIX
890 .unlocked_ioctl = cifs_ioctl,
891 #endif /* CONFIG_CIFS_POSIX */
892 .setlease = cifs_setlease,
895 const struct file_operations cifs_file_direct_ops = {
896 /* BB reevaluate whether they can be done with directio, no cache */
897 .read = do_sync_read,
898 .write = do_sync_write,
899 .aio_read = cifs_user_readv,
900 .aio_write = cifs_user_writev,
902 .release = cifs_close,
906 .mmap = cifs_file_mmap,
907 .splice_read = generic_file_splice_read,
908 #ifdef CONFIG_CIFS_POSIX
909 .unlocked_ioctl = cifs_ioctl,
910 #endif /* CONFIG_CIFS_POSIX */
911 .llseek = cifs_llseek,
912 .setlease = cifs_setlease,
915 const struct file_operations cifs_file_nobrl_ops = {
916 .read = do_sync_read,
917 .write = do_sync_write,
918 .aio_read = generic_file_aio_read,
919 .aio_write = cifs_file_aio_write,
921 .release = cifs_close,
924 .mmap = cifs_file_mmap,
925 .splice_read = generic_file_splice_read,
926 .llseek = cifs_llseek,
927 #ifdef CONFIG_CIFS_POSIX
928 .unlocked_ioctl = cifs_ioctl,
929 #endif /* CONFIG_CIFS_POSIX */
930 .setlease = cifs_setlease,
933 const struct file_operations cifs_file_strict_nobrl_ops = {
934 .read = do_sync_read,
935 .write = do_sync_write,
936 .aio_read = cifs_strict_readv,
937 .aio_write = cifs_strict_writev,
939 .release = cifs_close,
940 .fsync = cifs_strict_fsync,
942 .mmap = cifs_file_strict_mmap,
943 .splice_read = generic_file_splice_read,
944 .llseek = cifs_llseek,
945 #ifdef CONFIG_CIFS_POSIX
946 .unlocked_ioctl = cifs_ioctl,
947 #endif /* CONFIG_CIFS_POSIX */
948 .setlease = cifs_setlease,
951 const struct file_operations cifs_file_direct_nobrl_ops = {
952 /* BB reevaluate whether they can be done with directio, no cache */
953 .read = do_sync_read,
954 .write = do_sync_write,
955 .aio_read = cifs_user_readv,
956 .aio_write = cifs_user_writev,
958 .release = cifs_close,
961 .mmap = cifs_file_mmap,
962 .splice_read = generic_file_splice_read,
963 #ifdef CONFIG_CIFS_POSIX
964 .unlocked_ioctl = cifs_ioctl,
965 #endif /* CONFIG_CIFS_POSIX */
966 .llseek = cifs_llseek,
967 .setlease = cifs_setlease,
970 const struct file_operations cifs_dir_ops = {
971 .iterate = cifs_readdir,
972 .release = cifs_closedir,
973 .read = generic_read_dir,
974 .unlocked_ioctl = cifs_ioctl,
975 .llseek = generic_file_llseek,
979 cifs_init_once(void *inode)
981 struct cifsInodeInfo *cifsi = inode;
983 inode_init_once(&cifsi->vfs_inode);
984 init_rwsem(&cifsi->lock_sem);
988 cifs_init_inodecache(void)
990 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
991 sizeof(struct cifsInodeInfo),
992 0, (SLAB_RECLAIM_ACCOUNT|
995 if (cifs_inode_cachep == NULL)
1002 cifs_destroy_inodecache(void)
1005 * Make sure all delayed rcu free inodes are flushed before we
1009 kmem_cache_destroy(cifs_inode_cachep);
1013 cifs_init_request_bufs(void)
1015 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1016 #ifdef CONFIG_CIFS_SMB2
1018 * SMB2 maximum header size is bigger than CIFS one - no problems to
1019 * allocate some more bytes for CIFS.
1021 max_hdr_size = MAX_SMB2_HDR_SIZE;
1023 if (CIFSMaxBufSize < 8192) {
1024 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1025 Unicode path name has to fit in any SMB/CIFS path based frames */
1026 CIFSMaxBufSize = 8192;
1027 } else if (CIFSMaxBufSize > 1024*127) {
1028 CIFSMaxBufSize = 1024 * 127;
1030 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1033 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1034 CIFSMaxBufSize, CIFSMaxBufSize);
1036 cifs_req_cachep = kmem_cache_create("cifs_request",
1037 CIFSMaxBufSize + max_hdr_size, 0,
1038 SLAB_HWCACHE_ALIGN, NULL);
1039 if (cifs_req_cachep == NULL)
1042 if (cifs_min_rcv < 1)
1044 else if (cifs_min_rcv > 64) {
1046 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1049 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1052 if (cifs_req_poolp == NULL) {
1053 kmem_cache_destroy(cifs_req_cachep);
1056 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1057 almost all handle based requests (but not write response, nor is it
1058 sufficient for path based requests). A smaller size would have
1059 been more efficient (compacting multiple slab items on one 4k page)
1060 for the case in which debug was on, but this larger size allows
1061 more SMBs to use small buffer alloc and is still much more
1062 efficient to alloc 1 per page off the slab compared to 17K (5page)
1063 alloc of large cifs buffers even when page debugging is on */
1064 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1065 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1067 if (cifs_sm_req_cachep == NULL) {
1068 mempool_destroy(cifs_req_poolp);
1069 kmem_cache_destroy(cifs_req_cachep);
1073 if (cifs_min_small < 2)
1075 else if (cifs_min_small > 256) {
1076 cifs_min_small = 256;
1077 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1080 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1081 cifs_sm_req_cachep);
1083 if (cifs_sm_req_poolp == NULL) {
1084 mempool_destroy(cifs_req_poolp);
1085 kmem_cache_destroy(cifs_req_cachep);
1086 kmem_cache_destroy(cifs_sm_req_cachep);
1094 cifs_destroy_request_bufs(void)
1096 mempool_destroy(cifs_req_poolp);
1097 kmem_cache_destroy(cifs_req_cachep);
1098 mempool_destroy(cifs_sm_req_poolp);
1099 kmem_cache_destroy(cifs_sm_req_cachep);
1103 cifs_init_mids(void)
1105 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1106 sizeof(struct mid_q_entry), 0,
1107 SLAB_HWCACHE_ALIGN, NULL);
1108 if (cifs_mid_cachep == NULL)
1111 /* 3 is a reasonable minimum number of simultaneous operations */
1112 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1113 if (cifs_mid_poolp == NULL) {
1114 kmem_cache_destroy(cifs_mid_cachep);
1122 cifs_destroy_mids(void)
1124 mempool_destroy(cifs_mid_poolp);
1125 kmem_cache_destroy(cifs_mid_cachep);
1133 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1134 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1135 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1136 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1137 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1139 * Initialize Global counters
1141 atomic_set(&sesInfoAllocCount, 0);
1142 atomic_set(&tconInfoAllocCount, 0);
1143 atomic_set(&tcpSesAllocCount, 0);
1144 atomic_set(&tcpSesReconnectCount, 0);
1145 atomic_set(&tconInfoReconnectCount, 0);
1147 atomic_set(&bufAllocCount, 0);
1148 atomic_set(&smBufAllocCount, 0);
1149 #ifdef CONFIG_CIFS_STATS2
1150 atomic_set(&totBufAllocCount, 0);
1151 atomic_set(&totSmBufAllocCount, 0);
1152 #endif /* CONFIG_CIFS_STATS2 */
1154 atomic_set(&midCount, 0);
1155 GlobalCurrentXid = 0;
1156 GlobalTotalActiveXid = 0;
1157 GlobalMaxActiveXid = 0;
1158 spin_lock_init(&cifs_tcp_ses_lock);
1159 spin_lock_init(&cifs_file_list_lock);
1160 spin_lock_init(&GlobalMid_Lock);
1162 #ifdef CONFIG_CIFS_SMB2
1163 get_random_bytes(cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
1166 if (cifs_max_pending < 2) {
1167 cifs_max_pending = 2;
1168 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1169 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1170 cifs_max_pending = CIFS_MAX_REQ;
1171 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1175 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1178 goto out_clean_proc;
1181 rc = cifs_fscache_register();
1183 goto out_destroy_wq;
1185 rc = cifs_init_inodecache();
1187 goto out_unreg_fscache;
1189 rc = cifs_init_mids();
1191 goto out_destroy_inodecache;
1193 rc = cifs_init_request_bufs();
1195 goto out_destroy_mids;
1197 #ifdef CONFIG_CIFS_UPCALL
1198 rc = register_key_type(&cifs_spnego_key_type);
1200 goto out_destroy_request_bufs;
1201 #endif /* CONFIG_CIFS_UPCALL */
1203 #ifdef CONFIG_CIFS_ACL
1204 rc = init_cifs_idmap();
1206 goto out_register_key_type;
1207 #endif /* CONFIG_CIFS_ACL */
1209 rc = register_filesystem(&cifs_fs_type);
1211 goto out_init_cifs_idmap;
1215 out_init_cifs_idmap:
1216 #ifdef CONFIG_CIFS_ACL
1218 out_register_key_type:
1220 #ifdef CONFIG_CIFS_UPCALL
1221 unregister_key_type(&cifs_spnego_key_type);
1222 out_destroy_request_bufs:
1224 cifs_destroy_request_bufs();
1226 cifs_destroy_mids();
1227 out_destroy_inodecache:
1228 cifs_destroy_inodecache();
1230 cifs_fscache_unregister();
1232 destroy_workqueue(cifsiod_wq);
1241 cifs_dbg(NOISY, "exit_cifs\n");
1242 unregister_filesystem(&cifs_fs_type);
1243 cifs_dfs_release_automount_timer();
1244 #ifdef CONFIG_CIFS_ACL
1247 #ifdef CONFIG_CIFS_UPCALL
1248 unregister_key_type(&cifs_spnego_key_type);
1250 cifs_destroy_request_bufs();
1251 cifs_destroy_mids();
1252 cifs_destroy_inodecache();
1253 cifs_fscache_unregister();
1254 destroy_workqueue(cifsiod_wq);
1258 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1259 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1261 ("VFS to access servers complying with the SNIA CIFS Specification "
1262 "e.g. Samba and Windows");
1263 MODULE_VERSION(CIFS_VERSION);
1264 module_init(init_cifs)
1265 module_exit(exit_cifs)