4 * Copyright (C) International Business Machines Corp., 2002,2007
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>
40 #define DECLARE_GLOBALS_HERE
42 #include "cifsproto.h"
43 #include "cifs_debug.h"
44 #include "cifs_fs_sb.h"
46 #include <linux/key-type.h>
47 #include "dns_resolve.h"
48 #include "cifs_spnego.h"
49 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
51 #ifdef CONFIG_CIFS_QUOTA
52 static struct quotactl_ops cifs_quotactl_ops;
58 unsigned int oplockEnabled = 1;
59 unsigned int experimEnabled = 0;
60 unsigned int linuxExtEnabled = 1;
61 unsigned int lookupCacheEnabled = 1;
62 unsigned int multiuser_mount = 0;
63 unsigned int extended_security = CIFSSEC_DEF;
64 /* unsigned int ntlmv2_support = 0; */
65 unsigned int sign_CIFS_PDUs = 1;
66 extern struct task_struct *oplockThread; /* remove sparse warning */
67 struct task_struct *oplockThread = NULL;
68 /* extern struct task_struct * dnotifyThread; remove sparse warning */
69 static struct task_struct *dnotifyThread = NULL;
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;
100 #ifdef CONFIG_CIFS_DFS_UPCALL
105 /* BB should we make this contingent on mount parm? */
106 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
107 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
108 cifs_sb = CIFS_SB(sb);
112 #ifdef CONFIG_CIFS_DFS_UPCALL
113 /* copy mount params to sb for use in submounts */
114 /* BB: should we move this after the mount so we
115 * do not have to do the copy on failed mounts?
116 * BB: May be it is better to do simple copy before
117 * complex operation (mount), and in case of fail
118 * just exit instead of doing mount and attempting
119 * undo it if this copy fails?*/
121 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
122 if (cifs_sb->mountdata == NULL) {
123 kfree(sb->s_fs_info);
124 sb->s_fs_info = NULL;
127 strncpy(cifs_sb->mountdata, data, len + 1);
128 cifs_sb->mountdata[len] = '\0';
131 rc = cifs_mount(sb, cifs_sb, data, devname);
136 ("cifs_mount failed w/return code = %d", rc));
137 goto out_mount_failed;
140 sb->s_magic = CIFS_MAGIC_NUMBER;
141 sb->s_op = &cifs_super_ops;
142 /* if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
144 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
145 #ifdef CONFIG_CIFS_QUOTA
146 sb->s_qcop = &cifs_quotactl_ops;
148 sb->s_blocksize = CIFS_MAX_MSGSIZE;
149 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
150 inode = cifs_iget(sb, ROOT_I);
158 sb->s_root = d_alloc_root(inode);
165 #ifdef CONFIG_CIFS_EXPERIMENTAL
166 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
167 cFYI(1, ("export ops supported"));
168 sb->s_export_op = &cifs_export_ops;
170 #endif /* EXPERIMENTAL */
175 cERROR(1, ("cifs_read_super: get root inode failed"));
181 #ifdef CONFIG_CIFS_DFS_UPCALL
182 if (cifs_sb->mountdata) {
183 kfree(cifs_sb->mountdata);
184 cifs_sb->mountdata = NULL;
187 if (cifs_sb->local_nls)
188 unload_nls(cifs_sb->local_nls);
195 cifs_put_super(struct super_block *sb)
198 struct cifs_sb_info *cifs_sb;
200 cFYI(1, ("In cifs_put_super"));
201 cifs_sb = CIFS_SB(sb);
202 if (cifs_sb == NULL) {
203 cFYI(1, ("Empty cifs superblock info passed to unmount"));
206 rc = cifs_umount(sb, cifs_sb);
208 cERROR(1, ("cifs_umount failed with return code %d", rc));
209 #ifdef CONFIG_CIFS_DFS_UPCALL
210 if (cifs_sb->mountdata) {
211 kfree(cifs_sb->mountdata);
212 cifs_sb->mountdata = NULL;
216 unload_nls(cifs_sb->local_nls);
222 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
224 struct super_block *sb = dentry->d_sb;
226 int rc = -EOPNOTSUPP;
227 struct cifs_sb_info *cifs_sb;
228 struct cifsTconInfo *pTcon;
232 cifs_sb = CIFS_SB(sb);
233 pTcon = cifs_sb->tcon;
235 buf->f_type = CIFS_MAGIC_NUMBER;
237 /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
238 buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
239 presumably be total path, but note
240 that some servers (includinng Samba 3)
241 have a shorter maximum path */
242 buf->f_files = 0; /* undefined */
243 buf->f_ffree = 0; /* unlimited */
245 /* BB we could add a second check for a QFS Unix capability bit */
246 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
247 if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
248 le64_to_cpu(pTcon->fsUnixInfo.Capability)))
249 rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
251 /* Only need to call the old QFSInfo if failed
254 if (pTcon->ses->capabilities & CAP_NT_SMBS)
255 rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* not supported by OS2 */
257 /* Some old Windows servers also do not support level 103, retry with
258 older level one if old server failed the previous call or we
259 bypassed it because we detected that this was an older LANMAN sess */
261 rc = SMBOldQFSInfo(xid, pTcon, buf);
265 /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
267 return 0; /* always return success? what if volume is no
271 static int cifs_permission(struct inode *inode, int mask, struct nameidata *nd)
273 struct cifs_sb_info *cifs_sb;
275 cifs_sb = CIFS_SB(inode->i_sb);
277 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
279 else /* file mode might have been restricted at mount time
280 on the client (above and beyond ACL on servers) for
281 servers which do not support setting and viewing mode bits,
282 so allowing client to check permissions is useful */
283 return generic_permission(inode, mask, NULL);
286 static struct kmem_cache *cifs_inode_cachep;
287 static struct kmem_cache *cifs_req_cachep;
288 static struct kmem_cache *cifs_mid_cachep;
289 struct kmem_cache *cifs_oplock_cachep;
290 static struct kmem_cache *cifs_sm_req_cachep;
291 mempool_t *cifs_sm_req_poolp;
292 mempool_t *cifs_req_poolp;
293 mempool_t *cifs_mid_poolp;
295 static struct inode *
296 cifs_alloc_inode(struct super_block *sb)
298 struct cifsInodeInfo *cifs_inode;
299 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
302 cifs_inode->cifsAttrs = 0x20; /* default */
303 atomic_set(&cifs_inode->inUse, 0);
304 cifs_inode->time = 0;
305 cifs_inode->write_behind_rc = 0;
306 /* Until the file is open and we have gotten oplock
307 info back from the server, can not assume caching of
308 file data or metadata */
309 cifs_inode->clientCanCacheRead = FALSE;
310 cifs_inode->clientCanCacheAll = FALSE;
311 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
313 /* Can not set i_flags here - they get immediately overwritten
314 to zero by the VFS */
315 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
316 INIT_LIST_HEAD(&cifs_inode->openFileList);
317 return &cifs_inode->vfs_inode;
321 cifs_destroy_inode(struct inode *inode)
323 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
327 * cifs_show_options() is for displaying mount options in /proc/mounts.
328 * Not all settable options are displayed but most of the important
332 cifs_show_options(struct seq_file *s, struct vfsmount *m)
334 struct cifs_sb_info *cifs_sb;
336 cifs_sb = CIFS_SB(m->mnt_sb);
340 /* BB add prepath to mount options displayed */
341 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
342 if (cifs_sb->tcon->ses) {
343 if (cifs_sb->tcon->ses->userName)
344 seq_printf(s, ",username=%s",
345 cifs_sb->tcon->ses->userName);
346 if (cifs_sb->tcon->ses->domainName)
347 seq_printf(s, ",domain=%s",
348 cifs_sb->tcon->ses->domainName);
350 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
351 !(cifs_sb->tcon->unix_ext))
352 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
353 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
354 !(cifs_sb->tcon->unix_ext))
355 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
357 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
358 seq_printf(s, ",posixpaths");
359 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
360 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
365 #ifdef CONFIG_CIFS_QUOTA
366 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
367 struct fs_disk_quota *pdquota)
371 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
372 struct cifsTconInfo *pTcon;
375 pTcon = cifs_sb->tcon;
382 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
391 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
392 struct fs_disk_quota *pdquota)
396 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
397 struct cifsTconInfo *pTcon;
400 pTcon = cifs_sb->tcon;
406 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
415 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
419 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
420 struct cifsTconInfo *pTcon;
423 pTcon = cifs_sb->tcon;
429 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
438 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
442 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
443 struct cifsTconInfo *pTcon;
446 pTcon = cifs_sb->tcon;
452 cFYI(1, ("pqstats %p", qstats));
461 static struct quotactl_ops cifs_quotactl_ops = {
462 .set_xquota = cifs_xquota_set,
463 .get_xquota = cifs_xquota_get,
464 .set_xstate = cifs_xstate_set,
465 .get_xstate = cifs_xstate_get,
469 static void cifs_umount_begin(struct vfsmount *vfsmnt, int flags)
471 struct cifs_sb_info *cifs_sb;
472 struct cifsTconInfo *tcon;
474 dfs_shrink_umount_helper(vfsmnt);
476 if (!(flags & MNT_FORCE))
478 cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
482 tcon = cifs_sb->tcon;
485 down(&tcon->tconSem);
486 if (atomic_read(&tcon->useCount) == 1)
487 tcon->tidStatus = CifsExiting;
490 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
491 /* cancel_notify_requests(tcon); */
492 if (tcon->ses && tcon->ses->server) {
493 cFYI(1, ("wake up tasks now - umount begin not complete"));
494 wake_up_all(&tcon->ses->server->request_q);
495 wake_up_all(&tcon->ses->server->response_q);
496 msleep(1); /* yield */
497 /* we have to kick the requests once more */
498 wake_up_all(&tcon->ses->server->response_q);
501 /* BB FIXME - finish add checks for tidStatus BB */
506 #ifdef CONFIG_CIFS_STATS2
507 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
514 static int cifs_remount(struct super_block *sb, int *flags, char *data)
516 *flags |= MS_NODIRATIME;
520 static const struct super_operations cifs_super_ops = {
521 .put_super = cifs_put_super,
522 .statfs = cifs_statfs,
523 .alloc_inode = cifs_alloc_inode,
524 .destroy_inode = cifs_destroy_inode,
525 /* .drop_inode = generic_delete_inode,
526 .delete_inode = cifs_delete_inode, */ /* Do not need above two
527 functions unless later we add lazy close of inodes or unless the
528 kernel forgets to call us with the same number of releases (closes)
530 .show_options = cifs_show_options,
531 .umount_begin = cifs_umount_begin,
532 .remount_fs = cifs_remount,
533 #ifdef CONFIG_CIFS_STATS2
534 .show_stats = cifs_show_stats,
539 cifs_get_sb(struct file_system_type *fs_type,
540 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
543 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
545 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
552 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
554 up_write(&sb->s_umount);
555 deactivate_super(sb);
558 sb->s_flags |= MS_ACTIVE;
559 return simple_set_mnt(mnt, sb);
562 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
563 unsigned long nr_segs, loff_t pos)
565 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
568 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
569 if (!CIFS_I(inode)->clientCanCacheAll)
570 filemap_fdatawrite(inode->i_mapping);
574 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
576 /* origin == SEEK_END => we must revalidate the cached file length */
577 if (origin == SEEK_END) {
580 /* some applications poll for the file length in this strange
581 way so we must seek to end on non-oplocked files by
582 setting the revalidate time to zero */
583 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
585 retval = cifs_revalidate(file->f_path.dentry);
587 return (loff_t)retval;
589 return remote_llseek(file, offset, origin);
592 struct file_system_type cifs_fs_type = {
593 .owner = THIS_MODULE,
595 .get_sb = cifs_get_sb,
596 .kill_sb = kill_anon_super,
599 const struct inode_operations cifs_dir_inode_ops = {
600 .create = cifs_create,
601 .lookup = cifs_lookup,
602 .getattr = cifs_getattr,
603 .unlink = cifs_unlink,
604 .link = cifs_hardlink,
607 .rename = cifs_rename,
608 .permission = cifs_permission,
609 /* revalidate:cifs_revalidate, */
610 .setattr = cifs_setattr,
611 .symlink = cifs_symlink,
613 #ifdef CONFIG_CIFS_XATTR
614 .setxattr = cifs_setxattr,
615 .getxattr = cifs_getxattr,
616 .listxattr = cifs_listxattr,
617 .removexattr = cifs_removexattr,
621 const struct inode_operations cifs_file_inode_ops = {
622 /* revalidate:cifs_revalidate, */
623 .setattr = cifs_setattr,
624 .getattr = cifs_getattr, /* do we need this anymore? */
625 .rename = cifs_rename,
626 .permission = cifs_permission,
627 #ifdef CONFIG_CIFS_XATTR
628 .setxattr = cifs_setxattr,
629 .getxattr = cifs_getxattr,
630 .listxattr = cifs_listxattr,
631 .removexattr = cifs_removexattr,
635 const struct inode_operations cifs_symlink_inode_ops = {
636 .readlink = generic_readlink,
637 .follow_link = cifs_follow_link,
638 .put_link = cifs_put_link,
639 .permission = cifs_permission,
640 /* BB add the following two eventually */
641 /* revalidate: cifs_revalidate,
642 setattr: cifs_notify_change, *//* BB do we need notify change */
643 #ifdef CONFIG_CIFS_XATTR
644 .setxattr = cifs_setxattr,
645 .getxattr = cifs_getxattr,
646 .listxattr = cifs_listxattr,
647 .removexattr = cifs_removexattr,
651 const struct file_operations cifs_file_ops = {
652 .read = do_sync_read,
653 .write = do_sync_write,
654 .aio_read = generic_file_aio_read,
655 .aio_write = cifs_file_aio_write,
657 .release = cifs_close,
661 .mmap = cifs_file_mmap,
662 .splice_read = generic_file_splice_read,
663 .llseek = cifs_llseek,
664 #ifdef CONFIG_CIFS_POSIX
666 #endif /* CONFIG_CIFS_POSIX */
668 #ifdef CONFIG_CIFS_EXPERIMENTAL
669 .dir_notify = cifs_dir_notify,
670 #endif /* CONFIG_CIFS_EXPERIMENTAL */
673 const struct file_operations cifs_file_direct_ops = {
674 /* no mmap, no aio, no readv -
675 BB reevaluate whether they can be done with directio, no cache */
676 .read = cifs_user_read,
677 .write = cifs_user_write,
679 .release = cifs_close,
683 .splice_read = generic_file_splice_read,
684 #ifdef CONFIG_CIFS_POSIX
686 #endif /* CONFIG_CIFS_POSIX */
687 .llseek = cifs_llseek,
688 #ifdef CONFIG_CIFS_EXPERIMENTAL
689 .dir_notify = cifs_dir_notify,
690 #endif /* CONFIG_CIFS_EXPERIMENTAL */
692 const struct file_operations cifs_file_nobrl_ops = {
693 .read = do_sync_read,
694 .write = do_sync_write,
695 .aio_read = generic_file_aio_read,
696 .aio_write = cifs_file_aio_write,
698 .release = cifs_close,
701 .mmap = cifs_file_mmap,
702 .splice_read = generic_file_splice_read,
703 .llseek = cifs_llseek,
704 #ifdef CONFIG_CIFS_POSIX
706 #endif /* CONFIG_CIFS_POSIX */
708 #ifdef CONFIG_CIFS_EXPERIMENTAL
709 .dir_notify = cifs_dir_notify,
710 #endif /* CONFIG_CIFS_EXPERIMENTAL */
713 const struct file_operations cifs_file_direct_nobrl_ops = {
714 /* no mmap, no aio, no readv -
715 BB reevaluate whether they can be done with directio, no cache */
716 .read = cifs_user_read,
717 .write = cifs_user_write,
719 .release = cifs_close,
722 .splice_read = generic_file_splice_read,
723 #ifdef CONFIG_CIFS_POSIX
725 #endif /* CONFIG_CIFS_POSIX */
726 .llseek = cifs_llseek,
727 #ifdef CONFIG_CIFS_EXPERIMENTAL
728 .dir_notify = cifs_dir_notify,
729 #endif /* CONFIG_CIFS_EXPERIMENTAL */
732 const struct file_operations cifs_dir_ops = {
733 .readdir = cifs_readdir,
734 .release = cifs_closedir,
735 .read = generic_read_dir,
736 #ifdef CONFIG_CIFS_EXPERIMENTAL
737 .dir_notify = cifs_dir_notify,
738 #endif /* CONFIG_CIFS_EXPERIMENTAL */
743 cifs_init_once(struct kmem_cache *cachep, void *inode)
745 struct cifsInodeInfo *cifsi = inode;
747 inode_init_once(&cifsi->vfs_inode);
748 INIT_LIST_HEAD(&cifsi->lockList);
752 cifs_init_inodecache(void)
754 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
755 sizeof(struct cifsInodeInfo),
756 0, (SLAB_RECLAIM_ACCOUNT|
759 if (cifs_inode_cachep == NULL)
766 cifs_destroy_inodecache(void)
768 kmem_cache_destroy(cifs_inode_cachep);
772 cifs_init_request_bufs(void)
774 if (CIFSMaxBufSize < 8192) {
775 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
776 Unicode path name has to fit in any SMB/CIFS path based frames */
777 CIFSMaxBufSize = 8192;
778 } else if (CIFSMaxBufSize > 1024*127) {
779 CIFSMaxBufSize = 1024 * 127;
781 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
783 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
784 cifs_req_cachep = kmem_cache_create("cifs_request",
786 MAX_CIFS_HDR_SIZE, 0,
787 SLAB_HWCACHE_ALIGN, NULL);
788 if (cifs_req_cachep == NULL)
791 if (cifs_min_rcv < 1)
793 else if (cifs_min_rcv > 64) {
795 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
798 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
801 if (cifs_req_poolp == NULL) {
802 kmem_cache_destroy(cifs_req_cachep);
805 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
806 almost all handle based requests (but not write response, nor is it
807 sufficient for path based requests). A smaller size would have
808 been more efficient (compacting multiple slab items on one 4k page)
809 for the case in which debug was on, but this larger size allows
810 more SMBs to use small buffer alloc and is still much more
811 efficient to alloc 1 per page off the slab compared to 17K (5page)
812 alloc of large cifs buffers even when page debugging is on */
813 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
814 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
816 if (cifs_sm_req_cachep == NULL) {
817 mempool_destroy(cifs_req_poolp);
818 kmem_cache_destroy(cifs_req_cachep);
822 if (cifs_min_small < 2)
824 else if (cifs_min_small > 256) {
825 cifs_min_small = 256;
826 cFYI(1, ("cifs_min_small set to maximum (256)"));
829 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
832 if (cifs_sm_req_poolp == NULL) {
833 mempool_destroy(cifs_req_poolp);
834 kmem_cache_destroy(cifs_req_cachep);
835 kmem_cache_destroy(cifs_sm_req_cachep);
843 cifs_destroy_request_bufs(void)
845 mempool_destroy(cifs_req_poolp);
846 kmem_cache_destroy(cifs_req_cachep);
847 mempool_destroy(cifs_sm_req_poolp);
848 kmem_cache_destroy(cifs_sm_req_cachep);
854 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
855 sizeof(struct mid_q_entry), 0,
856 SLAB_HWCACHE_ALIGN, NULL);
857 if (cifs_mid_cachep == NULL)
860 /* 3 is a reasonable minimum number of simultaneous operations */
861 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
862 if (cifs_mid_poolp == NULL) {
863 kmem_cache_destroy(cifs_mid_cachep);
867 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
868 sizeof(struct oplock_q_entry), 0,
869 SLAB_HWCACHE_ALIGN, NULL);
870 if (cifs_oplock_cachep == NULL) {
871 mempool_destroy(cifs_mid_poolp);
872 kmem_cache_destroy(cifs_mid_cachep);
880 cifs_destroy_mids(void)
882 mempool_destroy(cifs_mid_poolp);
883 kmem_cache_destroy(cifs_mid_cachep);
884 kmem_cache_destroy(cifs_oplock_cachep);
887 static int cifs_oplock_thread(void *dummyarg)
889 struct oplock_q_entry *oplock_item;
890 struct cifsTconInfo *pTcon;
900 spin_lock(&GlobalMid_Lock);
901 if (list_empty(&GlobalOplock_Q)) {
902 spin_unlock(&GlobalMid_Lock);
903 set_current_state(TASK_INTERRUPTIBLE);
904 schedule_timeout(39*HZ);
906 oplock_item = list_entry(GlobalOplock_Q.next,
907 struct oplock_q_entry, qhead);
909 cFYI(1, ("found oplock item to write out"));
910 pTcon = oplock_item->tcon;
911 inode = oplock_item->pinode;
912 netfid = oplock_item->netfid;
913 spin_unlock(&GlobalMid_Lock);
914 DeleteOplockQEntry(oplock_item);
915 /* can not grab inode sem here since it would
916 deadlock when oplock received on delete
917 since vfs_unlink holds the i_mutex across
919 /* mutex_lock(&inode->i_mutex);*/
920 if (S_ISREG(inode->i_mode)) {
922 filemap_fdatawrite(inode->i_mapping);
923 if (CIFS_I(inode)->clientCanCacheRead
925 waitrc = filemap_fdatawait(inode->i_mapping);
926 invalidate_remote_inode(inode);
932 /* mutex_unlock(&inode->i_mutex);*/
934 CIFS_I(inode)->write_behind_rc = rc;
935 cFYI(1, ("Oplock flush inode %p rc %d",
938 /* releasing stale oplock after recent reconnect
939 of smb session using a now incorrect file
940 handle is not a data integrity issue but do
941 not bother sending an oplock release if session
942 to server still is disconnected since oplock
943 already released by the server in that case */
944 if (pTcon->tidStatus != CifsNeedReconnect) {
945 rc = CIFSSMBLock(0, pTcon, netfid,
946 0 /* len */ , 0 /* offset */, 0,
947 0, LOCKING_ANDX_OPLOCK_RELEASE,
949 cFYI(1, ("Oplock release rc = %d", rc));
952 spin_unlock(&GlobalMid_Lock);
953 set_current_state(TASK_INTERRUPTIBLE);
954 schedule_timeout(1); /* yield in case q were corrupt */
956 } while (!kthread_should_stop());
961 static int cifs_dnotify_thread(void *dummyarg)
963 struct list_head *tmp;
964 struct cifsSesInfo *ses;
969 set_current_state(TASK_INTERRUPTIBLE);
970 schedule_timeout(15*HZ);
971 read_lock(&GlobalSMBSeslock);
972 /* check if any stuck requests that need
973 to be woken up and wakeq so the
974 thread can wake up and error out */
975 list_for_each(tmp, &GlobalSMBSessionList) {
976 ses = list_entry(tmp, struct cifsSesInfo,
978 if (ses && ses->server &&
979 atomic_read(&ses->server->inFlight))
980 wake_up_all(&ses->server->response_q);
982 read_unlock(&GlobalSMBSeslock);
983 } while (!kthread_should_stop());
993 /* INIT_LIST_HEAD(&GlobalServerList);*/ /* BB not implemented yet */
994 INIT_LIST_HEAD(&GlobalSMBSessionList);
995 INIT_LIST_HEAD(&GlobalTreeConnectionList);
996 INIT_LIST_HEAD(&GlobalOplock_Q);
997 #ifdef CONFIG_CIFS_EXPERIMENTAL
998 INIT_LIST_HEAD(&GlobalDnotifyReqList);
999 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1002 * Initialize Global counters
1004 atomic_set(&sesInfoAllocCount, 0);
1005 atomic_set(&tconInfoAllocCount, 0);
1006 atomic_set(&tcpSesAllocCount, 0);
1007 atomic_set(&tcpSesReconnectCount, 0);
1008 atomic_set(&tconInfoReconnectCount, 0);
1010 atomic_set(&bufAllocCount, 0);
1011 atomic_set(&smBufAllocCount, 0);
1012 #ifdef CONFIG_CIFS_STATS2
1013 atomic_set(&totBufAllocCount, 0);
1014 atomic_set(&totSmBufAllocCount, 0);
1015 #endif /* CONFIG_CIFS_STATS2 */
1017 atomic_set(&midCount, 0);
1018 GlobalCurrentXid = 0;
1019 GlobalTotalActiveXid = 0;
1020 GlobalMaxActiveXid = 0;
1021 memset(Local_System_Name, 0, 15);
1022 rwlock_init(&GlobalSMBSeslock);
1023 spin_lock_init(&GlobalMid_Lock);
1025 if (cifs_max_pending < 2) {
1026 cifs_max_pending = 2;
1027 cFYI(1, ("cifs_max_pending set to min of 2"));
1028 } else if (cifs_max_pending > 256) {
1029 cifs_max_pending = 256;
1030 cFYI(1, ("cifs_max_pending set to max of 256"));
1033 rc = cifs_init_inodecache();
1035 goto out_clean_proc;
1037 rc = cifs_init_mids();
1039 goto out_destroy_inodecache;
1041 rc = cifs_init_request_bufs();
1043 goto out_destroy_mids;
1045 rc = register_filesystem(&cifs_fs_type);
1047 goto out_destroy_request_bufs;
1048 #ifdef CONFIG_CIFS_UPCALL
1049 rc = register_key_type(&cifs_spnego_key_type);
1051 goto out_unregister_filesystem;
1053 #ifdef CONFIG_CIFS_DFS_UPCALL
1054 rc = register_key_type(&key_type_dns_resolver);
1056 goto out_unregister_key_type;
1058 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1059 if (IS_ERR(oplockThread)) {
1060 rc = PTR_ERR(oplockThread);
1061 cERROR(1, ("error %d create oplock thread", rc));
1062 goto out_unregister_dfs_key_type;
1065 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1066 if (IS_ERR(dnotifyThread)) {
1067 rc = PTR_ERR(dnotifyThread);
1068 cERROR(1, ("error %d create dnotify thread", rc));
1069 goto out_stop_oplock_thread;
1074 out_stop_oplock_thread:
1075 kthread_stop(oplockThread);
1076 out_unregister_dfs_key_type:
1077 #ifdef CONFIG_CIFS_DFS_UPCALL
1078 unregister_key_type(&key_type_dns_resolver);
1079 out_unregister_key_type:
1081 #ifdef CONFIG_CIFS_UPCALL
1082 unregister_key_type(&cifs_spnego_key_type);
1083 out_unregister_filesystem:
1085 unregister_filesystem(&cifs_fs_type);
1086 out_destroy_request_bufs:
1087 cifs_destroy_request_bufs();
1089 cifs_destroy_mids();
1090 out_destroy_inodecache:
1091 cifs_destroy_inodecache();
1100 cFYI(DBG2, ("exit_cifs"));
1102 #ifdef CONFIG_CIFS_DFS_UPCALL
1103 unregister_key_type(&key_type_dns_resolver);
1105 #ifdef CONFIG_CIFS_UPCALL
1106 unregister_key_type(&cifs_spnego_key_type);
1108 unregister_filesystem(&cifs_fs_type);
1109 cifs_destroy_inodecache();
1110 cifs_destroy_mids();
1111 cifs_destroy_request_bufs();
1112 kthread_stop(oplockThread);
1113 kthread_stop(dnotifyThread);
1116 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1117 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1119 ("VFS to access servers complying with the SNIA CIFS Specification "
1120 "e.g. Samba and Windows");
1121 MODULE_VERSION(CIFS_VERSION);
1122 module_init(init_cifs)
1123 module_exit(exit_cifs)