4 * Copyright (C) International Business Machines Corp., 2002,2008
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/smp_lock.h>
41 #define DECLARE_GLOBALS_HERE
43 #include "cifsproto.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
47 #include <linux/key-type.h>
48 #include "dns_resolve.h"
49 #include "cifs_spnego.h"
50 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
52 #ifdef CONFIG_CIFS_QUOTA
53 static struct quotactl_ops cifs_quotactl_ops;
59 unsigned int oplockEnabled = 1;
60 unsigned int experimEnabled = 0;
61 unsigned int linuxExtEnabled = 1;
62 unsigned int lookupCacheEnabled = 1;
63 unsigned int multiuser_mount = 0;
64 unsigned int extended_security = CIFSSEC_DEF;
65 /* unsigned int ntlmv2_support = 0; */
66 unsigned int sign_CIFS_PDUs = 1;
67 extern struct task_struct *oplockThread; /* remove sparse warning */
68 struct task_struct *oplockThread = NULL;
69 /* extern struct task_struct * dnotifyThread; remove sparse warning */
70 static const struct super_operations cifs_super_ops;
71 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
72 module_param(CIFSMaxBufSize, int, 0);
73 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
74 "Default: 16384 Range: 8192 to 130048");
75 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
76 module_param(cifs_min_rcv, int, 0);
77 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
79 unsigned int cifs_min_small = 30;
80 module_param(cifs_min_small, int, 0);
81 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
83 unsigned int cifs_max_pending = CIFS_MAX_REQ;
84 module_param(cifs_max_pending, int, 0);
85 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
86 "Default: 50 Range: 2 to 256");
88 extern mempool_t *cifs_sm_req_poolp;
89 extern mempool_t *cifs_req_poolp;
90 extern mempool_t *cifs_mid_poolp;
92 extern struct kmem_cache *cifs_oplock_cachep;
95 cifs_read_super(struct super_block *sb, void *data,
96 const char *devname, int silent)
99 struct cifs_sb_info *cifs_sb;
102 /* BB should we make this contingent on mount parm? */
103 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
104 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
105 cifs_sb = CIFS_SB(sb);
109 #ifdef CONFIG_CIFS_DFS_UPCALL
110 /* copy mount params to sb for use in submounts */
111 /* BB: should we move this after the mount so we
112 * do not have to do the copy on failed mounts?
113 * BB: May be it is better to do simple copy before
114 * complex operation (mount), and in case of fail
115 * just exit instead of doing mount and attempting
116 * undo it if this copy fails?*/
118 int len = strlen(data);
119 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
120 if (cifs_sb->mountdata == NULL) {
121 kfree(sb->s_fs_info);
122 sb->s_fs_info = NULL;
125 strncpy(cifs_sb->mountdata, data, len + 1);
126 cifs_sb->mountdata[len] = '\0';
130 rc = cifs_mount(sb, cifs_sb, data, devname);
135 ("cifs_mount failed w/return code = %d", rc));
136 goto out_mount_failed;
139 sb->s_magic = CIFS_MAGIC_NUMBER;
140 sb->s_op = &cifs_super_ops;
141 /* if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
143 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
144 #ifdef CONFIG_CIFS_QUOTA
145 sb->s_qcop = &cifs_quotactl_ops;
147 sb->s_blocksize = CIFS_MAX_MSGSIZE;
148 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
149 inode = cifs_root_iget(sb, ROOT_I);
157 sb->s_root = d_alloc_root(inode);
164 #ifdef CONFIG_CIFS_EXPERIMENTAL
165 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
166 cFYI(1, ("export ops supported"));
167 sb->s_export_op = &cifs_export_ops;
169 #endif /* EXPERIMENTAL */
174 cERROR(1, ("cifs_read_super: get root inode failed"));
178 cifs_umount(sb, cifs_sb);
182 #ifdef CONFIG_CIFS_DFS_UPCALL
183 if (cifs_sb->mountdata) {
184 kfree(cifs_sb->mountdata);
185 cifs_sb->mountdata = NULL;
188 if (cifs_sb->local_nls)
189 unload_nls(cifs_sb->local_nls);
196 cifs_put_super(struct super_block *sb)
199 struct cifs_sb_info *cifs_sb;
201 cFYI(1, ("In cifs_put_super"));
202 cifs_sb = CIFS_SB(sb);
203 if (cifs_sb == NULL) {
204 cFYI(1, ("Empty cifs superblock info passed to unmount"));
210 rc = cifs_umount(sb, cifs_sb);
212 cERROR(1, ("cifs_umount failed with return code %d", rc));
213 #ifdef CONFIG_CIFS_DFS_UPCALL
214 if (cifs_sb->mountdata) {
215 kfree(cifs_sb->mountdata);
216 cifs_sb->mountdata = NULL;
220 unload_nls(cifs_sb->local_nls);
227 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
229 struct super_block *sb = dentry->d_sb;
230 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
231 struct cifsTconInfo *tcon = cifs_sb->tcon;
232 int rc = -EOPNOTSUPP;
237 buf->f_type = CIFS_MAGIC_NUMBER;
240 * PATH_MAX may be too long - it would presumably be total path,
241 * but note that some servers (includinng Samba 3) have a shorter
244 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
246 buf->f_namelen = PATH_MAX;
247 buf->f_files = 0; /* undefined */
248 buf->f_ffree = 0; /* unlimited */
251 * We could add a second check for a QFS Unix capability bit
253 if ((tcon->ses->capabilities & CAP_UNIX) &&
254 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
255 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
258 * Only need to call the old QFSInfo if failed on newer one,
261 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
262 rc = CIFSSMBQFSInfo(xid, tcon, buf);
265 * Some old Windows servers also do not support level 103, retry with
266 * older level one if old server failed the previous call or we
267 * bypassed it because we detected that this was an older LANMAN sess
270 rc = SMBOldQFSInfo(xid, tcon, buf);
276 static int cifs_permission(struct inode *inode, int mask)
278 struct cifs_sb_info *cifs_sb;
280 cifs_sb = CIFS_SB(inode->i_sb);
282 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
283 if ((mask & MAY_EXEC) && !execute_ok(inode))
287 } else /* file mode might have been restricted at mount time
288 on the client (above and beyond ACL on servers) for
289 servers which do not support setting and viewing mode bits,
290 so allowing client to check permissions is useful */
291 return generic_permission(inode, mask, NULL);
294 static struct kmem_cache *cifs_inode_cachep;
295 static struct kmem_cache *cifs_req_cachep;
296 static struct kmem_cache *cifs_mid_cachep;
297 struct kmem_cache *cifs_oplock_cachep;
298 static struct kmem_cache *cifs_sm_req_cachep;
299 mempool_t *cifs_sm_req_poolp;
300 mempool_t *cifs_req_poolp;
301 mempool_t *cifs_mid_poolp;
303 static struct inode *
304 cifs_alloc_inode(struct super_block *sb)
306 struct cifsInodeInfo *cifs_inode;
307 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
310 cifs_inode->cifsAttrs = 0x20; /* default */
311 atomic_set(&cifs_inode->inUse, 0);
312 cifs_inode->time = 0;
313 cifs_inode->write_behind_rc = 0;
314 /* Until the file is open and we have gotten oplock
315 info back from the server, can not assume caching of
316 file data or metadata */
317 cifs_inode->clientCanCacheRead = false;
318 cifs_inode->clientCanCacheAll = false;
319 cifs_inode->delete_pending = false;
320 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
321 cifs_inode->server_eof = 0;
323 /* Can not set i_flags here - they get immediately overwritten
324 to zero by the VFS */
325 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
326 INIT_LIST_HEAD(&cifs_inode->openFileList);
327 return &cifs_inode->vfs_inode;
331 cifs_destroy_inode(struct inode *inode)
333 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
337 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
339 seq_printf(s, ",addr=");
341 switch (server->addr.sockAddr.sin_family) {
343 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
346 seq_printf(s, "%pI6",
347 &server->addr.sockAddr6.sin6_addr.s6_addr);
348 if (server->addr.sockAddr6.sin6_scope_id)
349 seq_printf(s, "%%%u",
350 server->addr.sockAddr6.sin6_scope_id);
353 seq_printf(s, "(unknown)");
358 * cifs_show_options() is for displaying mount options in /proc/mounts.
359 * Not all settable options are displayed but most of the important
363 cifs_show_options(struct seq_file *s, struct vfsmount *m)
365 struct cifs_sb_info *cifs_sb;
366 struct cifsTconInfo *tcon;
368 cifs_sb = CIFS_SB(m->mnt_sb);
369 tcon = cifs_sb->tcon;
371 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
372 if (tcon->ses->userName)
373 seq_printf(s, ",username=%s", tcon->ses->userName);
374 if (tcon->ses->domainName)
375 seq_printf(s, ",domain=%s", tcon->ses->domainName);
377 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
378 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
379 seq_printf(s, ",forceuid");
381 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
382 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
383 seq_printf(s, ",forcegid");
385 cifs_show_address(s, tcon->ses->server);
388 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
389 cifs_sb->mnt_file_mode,
390 cifs_sb->mnt_dir_mode);
392 seq_printf(s, ",seal");
394 seq_printf(s, ",nocase");
396 seq_printf(s, ",hard");
397 if (cifs_sb->prepath)
398 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
399 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
400 seq_printf(s, ",posixpaths");
401 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
402 seq_printf(s, ",setuids");
403 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
404 seq_printf(s, ",serverino");
405 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
406 seq_printf(s, ",directio");
407 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
408 seq_printf(s, ",nouser_xattr");
409 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
410 seq_printf(s, ",mapchars");
411 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
412 seq_printf(s, ",sfu");
413 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
414 seq_printf(s, ",nobrl");
415 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
416 seq_printf(s, ",cifsacl");
417 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
418 seq_printf(s, ",dynperm");
419 if (m->mnt_sb->s_flags & MS_POSIXACL)
420 seq_printf(s, ",acl");
422 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
423 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
428 #ifdef CONFIG_CIFS_QUOTA
429 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
430 struct fs_disk_quota *pdquota)
434 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
435 struct cifsTconInfo *pTcon;
438 pTcon = cifs_sb->tcon;
445 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
453 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
454 struct fs_disk_quota *pdquota)
458 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
459 struct cifsTconInfo *pTcon;
462 pTcon = cifs_sb->tcon;
468 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
476 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
480 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
481 struct cifsTconInfo *pTcon;
484 pTcon = cifs_sb->tcon;
490 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
498 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
502 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
503 struct cifsTconInfo *pTcon;
506 pTcon = cifs_sb->tcon;
512 cFYI(1, ("pqstats %p", qstats));
520 static struct quotactl_ops cifs_quotactl_ops = {
521 .set_xquota = cifs_xquota_set,
522 .get_xquota = cifs_xquota_get,
523 .set_xstate = cifs_xstate_set,
524 .get_xstate = cifs_xstate_get,
528 static void cifs_umount_begin(struct super_block *sb)
530 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
531 struct cifsTconInfo *tcon;
536 tcon = cifs_sb->tcon;
541 read_lock(&cifs_tcp_ses_lock);
542 if (tcon->tc_count == 1)
543 tcon->tidStatus = CifsExiting;
544 read_unlock(&cifs_tcp_ses_lock);
546 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
547 /* cancel_notify_requests(tcon); */
548 if (tcon->ses && tcon->ses->server) {
549 cFYI(1, ("wake up tasks now - umount begin not complete"));
550 wake_up_all(&tcon->ses->server->request_q);
551 wake_up_all(&tcon->ses->server->response_q);
552 msleep(1); /* yield */
553 /* we have to kick the requests once more */
554 wake_up_all(&tcon->ses->server->response_q);
557 /* BB FIXME - finish add checks for tidStatus BB */
563 #ifdef CONFIG_CIFS_STATS2
564 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
571 static int cifs_remount(struct super_block *sb, int *flags, char *data)
573 *flags |= MS_NODIRATIME;
577 static const struct super_operations cifs_super_ops = {
578 .put_super = cifs_put_super,
579 .statfs = cifs_statfs,
580 .alloc_inode = cifs_alloc_inode,
581 .destroy_inode = cifs_destroy_inode,
582 /* .drop_inode = generic_delete_inode,
583 .delete_inode = cifs_delete_inode, */ /* Do not need above two
584 functions unless later we add lazy close of inodes or unless the
585 kernel forgets to call us with the same number of releases (closes)
587 .show_options = cifs_show_options,
588 .umount_begin = cifs_umount_begin,
589 .remount_fs = cifs_remount,
590 #ifdef CONFIG_CIFS_STATS2
591 .show_stats = cifs_show_stats,
596 cifs_get_sb(struct file_system_type *fs_type,
597 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
600 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
602 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
609 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
611 deactivate_locked_super(sb);
614 sb->s_flags |= MS_ACTIVE;
615 simple_set_mnt(mnt, sb);
619 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
620 unsigned long nr_segs, loff_t pos)
622 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
625 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
626 if (!CIFS_I(inode)->clientCanCacheAll)
627 filemap_fdatawrite(inode->i_mapping);
631 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
633 /* origin == SEEK_END => we must revalidate the cached file length */
634 if (origin == SEEK_END) {
637 /* some applications poll for the file length in this strange
638 way so we must seek to end on non-oplocked files by
639 setting the revalidate time to zero */
640 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
642 retval = cifs_revalidate(file->f_path.dentry);
644 return (loff_t)retval;
646 return generic_file_llseek_unlocked(file, offset, origin);
649 #ifdef CONFIG_CIFS_EXPERIMENTAL
650 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
652 /* note that this is called by vfs setlease with the BKL held
653 although I doubt that BKL is needed here in cifs */
654 struct inode *inode = file->f_path.dentry->d_inode;
656 if (!(S_ISREG(inode->i_mode)))
659 /* check if file is oplocked */
660 if (((arg == F_RDLCK) &&
661 (CIFS_I(inode)->clientCanCacheRead)) ||
663 (CIFS_I(inode)->clientCanCacheAll)))
664 return generic_setlease(file, arg, lease);
665 else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
666 !CIFS_I(inode)->clientCanCacheRead)
667 /* If the server claims to support oplock on this
668 file, then we still need to check oplock even
669 if the local_lease mount option is set, but there
670 are servers which do not support oplock for which
671 this mount option may be useful if the user
672 knows that the file won't be changed on the server
674 return generic_setlease(file, arg, lease);
680 struct file_system_type cifs_fs_type = {
681 .owner = THIS_MODULE,
683 .get_sb = cifs_get_sb,
684 .kill_sb = kill_anon_super,
687 const struct inode_operations cifs_dir_inode_ops = {
688 .create = cifs_create,
689 .lookup = cifs_lookup,
690 .getattr = cifs_getattr,
691 .unlink = cifs_unlink,
692 .link = cifs_hardlink,
695 .rename = cifs_rename,
696 .permission = cifs_permission,
697 /* revalidate:cifs_revalidate, */
698 .setattr = cifs_setattr,
699 .symlink = cifs_symlink,
701 #ifdef CONFIG_CIFS_XATTR
702 .setxattr = cifs_setxattr,
703 .getxattr = cifs_getxattr,
704 .listxattr = cifs_listxattr,
705 .removexattr = cifs_removexattr,
709 const struct inode_operations cifs_file_inode_ops = {
710 /* revalidate:cifs_revalidate, */
711 .setattr = cifs_setattr,
712 .getattr = cifs_getattr, /* do we need this anymore? */
713 .rename = cifs_rename,
714 .permission = cifs_permission,
715 #ifdef CONFIG_CIFS_XATTR
716 .setxattr = cifs_setxattr,
717 .getxattr = cifs_getxattr,
718 .listxattr = cifs_listxattr,
719 .removexattr = cifs_removexattr,
723 const struct inode_operations cifs_symlink_inode_ops = {
724 .readlink = generic_readlink,
725 .follow_link = cifs_follow_link,
726 .put_link = cifs_put_link,
727 .permission = cifs_permission,
728 /* BB add the following two eventually */
729 /* revalidate: cifs_revalidate,
730 setattr: cifs_notify_change, *//* BB do we need notify change */
731 #ifdef CONFIG_CIFS_XATTR
732 .setxattr = cifs_setxattr,
733 .getxattr = cifs_getxattr,
734 .listxattr = cifs_listxattr,
735 .removexattr = cifs_removexattr,
739 const struct file_operations cifs_file_ops = {
740 .read = do_sync_read,
741 .write = do_sync_write,
742 .aio_read = generic_file_aio_read,
743 .aio_write = cifs_file_aio_write,
745 .release = cifs_close,
749 .mmap = cifs_file_mmap,
750 .splice_read = generic_file_splice_read,
751 .llseek = cifs_llseek,
752 #ifdef CONFIG_CIFS_POSIX
753 .unlocked_ioctl = cifs_ioctl,
754 #endif /* CONFIG_CIFS_POSIX */
756 #ifdef CONFIG_CIFS_EXPERIMENTAL
757 .setlease = cifs_setlease,
758 #endif /* CONFIG_CIFS_EXPERIMENTAL */
761 const struct file_operations cifs_file_direct_ops = {
762 /* no mmap, no aio, no readv -
763 BB reevaluate whether they can be done with directio, no cache */
764 .read = cifs_user_read,
765 .write = cifs_user_write,
767 .release = cifs_close,
771 .splice_read = generic_file_splice_read,
772 #ifdef CONFIG_CIFS_POSIX
773 .unlocked_ioctl = cifs_ioctl,
774 #endif /* CONFIG_CIFS_POSIX */
775 .llseek = cifs_llseek,
776 #ifdef CONFIG_CIFS_EXPERIMENTAL
777 .setlease = cifs_setlease,
778 #endif /* CONFIG_CIFS_EXPERIMENTAL */
780 const struct file_operations cifs_file_nobrl_ops = {
781 .read = do_sync_read,
782 .write = do_sync_write,
783 .aio_read = generic_file_aio_read,
784 .aio_write = cifs_file_aio_write,
786 .release = cifs_close,
789 .mmap = cifs_file_mmap,
790 .splice_read = generic_file_splice_read,
791 .llseek = cifs_llseek,
792 #ifdef CONFIG_CIFS_POSIX
793 .unlocked_ioctl = cifs_ioctl,
794 #endif /* CONFIG_CIFS_POSIX */
796 #ifdef CONFIG_CIFS_EXPERIMENTAL
797 .setlease = cifs_setlease,
798 #endif /* CONFIG_CIFS_EXPERIMENTAL */
801 const struct file_operations cifs_file_direct_nobrl_ops = {
802 /* no mmap, no aio, no readv -
803 BB reevaluate whether they can be done with directio, no cache */
804 .read = cifs_user_read,
805 .write = cifs_user_write,
807 .release = cifs_close,
810 .splice_read = generic_file_splice_read,
811 #ifdef CONFIG_CIFS_POSIX
812 .unlocked_ioctl = cifs_ioctl,
813 #endif /* CONFIG_CIFS_POSIX */
814 .llseek = cifs_llseek,
815 #ifdef CONFIG_CIFS_EXPERIMENTAL
816 .setlease = cifs_setlease,
817 #endif /* CONFIG_CIFS_EXPERIMENTAL */
820 const struct file_operations cifs_dir_ops = {
821 .readdir = cifs_readdir,
822 .release = cifs_closedir,
823 .read = generic_read_dir,
824 .unlocked_ioctl = cifs_ioctl,
825 .llseek = generic_file_llseek,
829 cifs_init_once(void *inode)
831 struct cifsInodeInfo *cifsi = inode;
833 inode_init_once(&cifsi->vfs_inode);
834 INIT_LIST_HEAD(&cifsi->lockList);
838 cifs_init_inodecache(void)
840 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
841 sizeof(struct cifsInodeInfo),
842 0, (SLAB_RECLAIM_ACCOUNT|
845 if (cifs_inode_cachep == NULL)
852 cifs_destroy_inodecache(void)
854 kmem_cache_destroy(cifs_inode_cachep);
858 cifs_init_request_bufs(void)
860 if (CIFSMaxBufSize < 8192) {
861 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
862 Unicode path name has to fit in any SMB/CIFS path based frames */
863 CIFSMaxBufSize = 8192;
864 } else if (CIFSMaxBufSize > 1024*127) {
865 CIFSMaxBufSize = 1024 * 127;
867 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
869 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
870 cifs_req_cachep = kmem_cache_create("cifs_request",
872 MAX_CIFS_HDR_SIZE, 0,
873 SLAB_HWCACHE_ALIGN, NULL);
874 if (cifs_req_cachep == NULL)
877 if (cifs_min_rcv < 1)
879 else if (cifs_min_rcv > 64) {
881 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
884 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
887 if (cifs_req_poolp == NULL) {
888 kmem_cache_destroy(cifs_req_cachep);
891 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
892 almost all handle based requests (but not write response, nor is it
893 sufficient for path based requests). A smaller size would have
894 been more efficient (compacting multiple slab items on one 4k page)
895 for the case in which debug was on, but this larger size allows
896 more SMBs to use small buffer alloc and is still much more
897 efficient to alloc 1 per page off the slab compared to 17K (5page)
898 alloc of large cifs buffers even when page debugging is on */
899 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
900 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
902 if (cifs_sm_req_cachep == NULL) {
903 mempool_destroy(cifs_req_poolp);
904 kmem_cache_destroy(cifs_req_cachep);
908 if (cifs_min_small < 2)
910 else if (cifs_min_small > 256) {
911 cifs_min_small = 256;
912 cFYI(1, ("cifs_min_small set to maximum (256)"));
915 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
918 if (cifs_sm_req_poolp == NULL) {
919 mempool_destroy(cifs_req_poolp);
920 kmem_cache_destroy(cifs_req_cachep);
921 kmem_cache_destroy(cifs_sm_req_cachep);
929 cifs_destroy_request_bufs(void)
931 mempool_destroy(cifs_req_poolp);
932 kmem_cache_destroy(cifs_req_cachep);
933 mempool_destroy(cifs_sm_req_poolp);
934 kmem_cache_destroy(cifs_sm_req_cachep);
940 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
941 sizeof(struct mid_q_entry), 0,
942 SLAB_HWCACHE_ALIGN, NULL);
943 if (cifs_mid_cachep == NULL)
946 /* 3 is a reasonable minimum number of simultaneous operations */
947 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
948 if (cifs_mid_poolp == NULL) {
949 kmem_cache_destroy(cifs_mid_cachep);
953 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
954 sizeof(struct oplock_q_entry), 0,
955 SLAB_HWCACHE_ALIGN, NULL);
956 if (cifs_oplock_cachep == NULL) {
957 mempool_destroy(cifs_mid_poolp);
958 kmem_cache_destroy(cifs_mid_cachep);
966 cifs_destroy_mids(void)
968 mempool_destroy(cifs_mid_poolp);
969 kmem_cache_destroy(cifs_mid_cachep);
970 kmem_cache_destroy(cifs_oplock_cachep);
973 static int cifs_oplock_thread(void *dummyarg)
975 struct oplock_q_entry *oplock_item;
976 struct cifsTconInfo *pTcon;
986 spin_lock(&GlobalMid_Lock);
987 if (list_empty(&GlobalOplock_Q)) {
988 spin_unlock(&GlobalMid_Lock);
989 set_current_state(TASK_INTERRUPTIBLE);
990 schedule_timeout(39*HZ);
992 oplock_item = list_entry(GlobalOplock_Q.next,
993 struct oplock_q_entry, qhead);
994 cFYI(1, ("found oplock item to write out"));
995 pTcon = oplock_item->tcon;
996 inode = oplock_item->pinode;
997 netfid = oplock_item->netfid;
998 spin_unlock(&GlobalMid_Lock);
999 DeleteOplockQEntry(oplock_item);
1000 /* can not grab inode sem here since it would
1001 deadlock when oplock received on delete
1002 since vfs_unlink holds the i_mutex across
1004 /* mutex_lock(&inode->i_mutex);*/
1005 if (S_ISREG(inode->i_mode)) {
1006 #ifdef CONFIG_CIFS_EXPERIMENTAL
1007 if (CIFS_I(inode)->clientCanCacheAll == 0)
1008 break_lease(inode, FMODE_READ);
1009 else if (CIFS_I(inode)->clientCanCacheRead == 0)
1010 break_lease(inode, FMODE_WRITE);
1012 rc = filemap_fdatawrite(inode->i_mapping);
1013 if (CIFS_I(inode)->clientCanCacheRead == 0) {
1014 waitrc = filemap_fdatawait(
1016 invalidate_remote_inode(inode);
1022 /* mutex_unlock(&inode->i_mutex);*/
1024 CIFS_I(inode)->write_behind_rc = rc;
1025 cFYI(1, ("Oplock flush inode %p rc %d",
1028 /* releasing stale oplock after recent reconnect
1029 of smb session using a now incorrect file
1030 handle is not a data integrity issue but do
1031 not bother sending an oplock release if session
1032 to server still is disconnected since oplock
1033 already released by the server in that case */
1034 if (!pTcon->need_reconnect) {
1035 rc = CIFSSMBLock(0, pTcon, netfid,
1036 0 /* len */ , 0 /* offset */, 0,
1037 0, LOCKING_ANDX_OPLOCK_RELEASE,
1038 false /* wait flag */);
1039 cFYI(1, ("Oplock release rc = %d", rc));
1041 set_current_state(TASK_INTERRUPTIBLE);
1042 schedule_timeout(1); /* yield in case q were corrupt */
1044 } while (!kthread_should_stop());
1054 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1055 INIT_LIST_HEAD(&GlobalOplock_Q);
1056 #ifdef CONFIG_CIFS_EXPERIMENTAL
1057 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1058 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1061 * Initialize Global counters
1063 atomic_set(&sesInfoAllocCount, 0);
1064 atomic_set(&tconInfoAllocCount, 0);
1065 atomic_set(&tcpSesAllocCount, 0);
1066 atomic_set(&tcpSesReconnectCount, 0);
1067 atomic_set(&tconInfoReconnectCount, 0);
1069 atomic_set(&bufAllocCount, 0);
1070 atomic_set(&smBufAllocCount, 0);
1071 #ifdef CONFIG_CIFS_STATS2
1072 atomic_set(&totBufAllocCount, 0);
1073 atomic_set(&totSmBufAllocCount, 0);
1074 #endif /* CONFIG_CIFS_STATS2 */
1076 atomic_set(&midCount, 0);
1077 GlobalCurrentXid = 0;
1078 GlobalTotalActiveXid = 0;
1079 GlobalMaxActiveXid = 0;
1080 memset(Local_System_Name, 0, 15);
1081 rwlock_init(&GlobalSMBSeslock);
1082 rwlock_init(&cifs_tcp_ses_lock);
1083 spin_lock_init(&GlobalMid_Lock);
1085 if (cifs_max_pending < 2) {
1086 cifs_max_pending = 2;
1087 cFYI(1, ("cifs_max_pending set to min of 2"));
1088 } else if (cifs_max_pending > 256) {
1089 cifs_max_pending = 256;
1090 cFYI(1, ("cifs_max_pending set to max of 256"));
1093 rc = cifs_init_inodecache();
1095 goto out_clean_proc;
1097 rc = cifs_init_mids();
1099 goto out_destroy_inodecache;
1101 rc = cifs_init_request_bufs();
1103 goto out_destroy_mids;
1105 rc = register_filesystem(&cifs_fs_type);
1107 goto out_destroy_request_bufs;
1108 #ifdef CONFIG_CIFS_UPCALL
1109 rc = register_key_type(&cifs_spnego_key_type);
1111 goto out_unregister_filesystem;
1113 #ifdef CONFIG_CIFS_DFS_UPCALL
1114 rc = register_key_type(&key_type_dns_resolver);
1116 goto out_unregister_key_type;
1118 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1119 if (IS_ERR(oplockThread)) {
1120 rc = PTR_ERR(oplockThread);
1121 cERROR(1, ("error %d create oplock thread", rc));
1122 goto out_unregister_dfs_key_type;
1127 out_unregister_dfs_key_type:
1128 #ifdef CONFIG_CIFS_DFS_UPCALL
1129 unregister_key_type(&key_type_dns_resolver);
1130 out_unregister_key_type:
1132 #ifdef CONFIG_CIFS_UPCALL
1133 unregister_key_type(&cifs_spnego_key_type);
1134 out_unregister_filesystem:
1136 unregister_filesystem(&cifs_fs_type);
1137 out_destroy_request_bufs:
1138 cifs_destroy_request_bufs();
1140 cifs_destroy_mids();
1141 out_destroy_inodecache:
1142 cifs_destroy_inodecache();
1151 cFYI(DBG2, ("exit_cifs"));
1153 #ifdef CONFIG_CIFS_DFS_UPCALL
1154 cifs_dfs_release_automount_timer();
1155 unregister_key_type(&key_type_dns_resolver);
1157 #ifdef CONFIG_CIFS_UPCALL
1158 unregister_key_type(&cifs_spnego_key_type);
1160 unregister_filesystem(&cifs_fs_type);
1161 cifs_destroy_inodecache();
1162 cifs_destroy_mids();
1163 cifs_destroy_request_bufs();
1164 kthread_stop(oplockThread);
1168 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1170 ("VFS to access servers complying with the SNIA CIFS Specification "
1171 "e.g. Samba and Windows");
1172 MODULE_VERSION(CIFS_VERSION);
1173 module_init(init_cifs)
1174 module_exit(exit_cifs)