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 = 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"));
180 #ifdef CONFIG_CIFS_DFS_UPCALL
181 if (cifs_sb->mountdata) {
182 kfree(cifs_sb->mountdata);
183 cifs_sb->mountdata = NULL;
186 if (cifs_sb->local_nls)
187 unload_nls(cifs_sb->local_nls);
194 cifs_put_super(struct super_block *sb)
197 struct cifs_sb_info *cifs_sb;
199 cFYI(1, ("In cifs_put_super"));
200 cifs_sb = CIFS_SB(sb);
201 if (cifs_sb == NULL) {
202 cFYI(1, ("Empty cifs superblock info passed to unmount"));
205 rc = cifs_umount(sb, cifs_sb);
207 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_set,
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 if (!(flags & MNT_FORCE))
476 cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
480 tcon = cifs_sb->tcon;
483 down(&tcon->tconSem);
484 if (atomic_read(&tcon->useCount) == 1)
485 tcon->tidStatus = CifsExiting;
488 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
489 /* cancel_notify_requests(tcon); */
490 if (tcon->ses && tcon->ses->server) {
491 cFYI(1, ("wake up tasks now - umount begin not complete"));
492 wake_up_all(&tcon->ses->server->request_q);
493 wake_up_all(&tcon->ses->server->response_q);
494 msleep(1); /* yield */
495 /* we have to kick the requests once more */
496 wake_up_all(&tcon->ses->server->response_q);
499 /* BB FIXME - finish add checks for tidStatus BB */
504 #ifdef CONFIG_CIFS_STATS2
505 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
512 static int cifs_remount(struct super_block *sb, int *flags, char *data)
514 *flags |= MS_NODIRATIME;
518 static const struct super_operations cifs_super_ops = {
519 .read_inode = cifs_read_inode,
520 .put_super = cifs_put_super,
521 .statfs = cifs_statfs,
522 .alloc_inode = cifs_alloc_inode,
523 .destroy_inode = cifs_destroy_inode,
524 /* .drop_inode = generic_delete_inode,
525 .delete_inode = cifs_delete_inode, */ /* Do not need above two
526 functions unless later we add lazy close of inodes or unless the
527 kernel forgets to call us with the same number of releases (closes)
529 .show_options = cifs_show_options,
530 .umount_begin = cifs_umount_begin,
531 .remount_fs = cifs_remount,
532 #ifdef CONFIG_CIFS_STATS2
533 .show_stats = cifs_show_stats,
538 cifs_get_sb(struct file_system_type *fs_type,
539 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
542 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
544 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
551 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
553 up_write(&sb->s_umount);
554 deactivate_super(sb);
557 sb->s_flags |= MS_ACTIVE;
558 return simple_set_mnt(mnt, sb);
561 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
562 unsigned long nr_segs, loff_t pos)
564 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
567 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
568 if (!CIFS_I(inode)->clientCanCacheAll)
569 filemap_fdatawrite(inode->i_mapping);
573 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
575 /* origin == SEEK_END => we must revalidate the cached file length */
576 if (origin == SEEK_END) {
579 /* some applications poll for the file length in this strange
580 way so we must seek to end on non-oplocked files by
581 setting the revalidate time to zero */
582 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
584 retval = cifs_revalidate(file->f_path.dentry);
586 return (loff_t)retval;
588 return remote_llseek(file, offset, origin);
591 struct file_system_type cifs_fs_type = {
592 .owner = THIS_MODULE,
594 .get_sb = cifs_get_sb,
595 .kill_sb = kill_anon_super,
598 const struct inode_operations cifs_dir_inode_ops = {
599 .create = cifs_create,
600 .lookup = cifs_lookup,
601 .getattr = cifs_getattr,
602 .unlink = cifs_unlink,
603 .link = cifs_hardlink,
606 .rename = cifs_rename,
607 .permission = cifs_permission,
608 /* revalidate:cifs_revalidate, */
609 .setattr = cifs_setattr,
610 .symlink = cifs_symlink,
612 #ifdef CONFIG_CIFS_XATTR
613 .setxattr = cifs_setxattr,
614 .getxattr = cifs_getxattr,
615 .listxattr = cifs_listxattr,
616 .removexattr = cifs_removexattr,
620 const struct inode_operations cifs_file_inode_ops = {
621 /* revalidate:cifs_revalidate, */
622 .setattr = cifs_setattr,
623 .getattr = cifs_getattr, /* do we need this anymore? */
624 .rename = cifs_rename,
625 .permission = cifs_permission,
626 #ifdef CONFIG_CIFS_XATTR
627 .setxattr = cifs_setxattr,
628 .getxattr = cifs_getxattr,
629 .listxattr = cifs_listxattr,
630 .removexattr = cifs_removexattr,
634 const struct inode_operations cifs_symlink_inode_ops = {
635 .readlink = generic_readlink,
636 .follow_link = cifs_follow_link,
637 .put_link = cifs_put_link,
638 .permission = cifs_permission,
639 /* BB add the following two eventually */
640 /* revalidate: cifs_revalidate,
641 setattr: cifs_notify_change, *//* BB do we need notify change */
642 #ifdef CONFIG_CIFS_XATTR
643 .setxattr = cifs_setxattr,
644 .getxattr = cifs_getxattr,
645 .listxattr = cifs_listxattr,
646 .removexattr = cifs_removexattr,
650 const struct file_operations cifs_file_ops = {
651 .read = do_sync_read,
652 .write = do_sync_write,
653 .aio_read = generic_file_aio_read,
654 .aio_write = cifs_file_aio_write,
656 .release = cifs_close,
660 .mmap = cifs_file_mmap,
661 .splice_read = generic_file_splice_read,
662 .llseek = cifs_llseek,
663 #ifdef CONFIG_CIFS_POSIX
665 #endif /* CONFIG_CIFS_POSIX */
667 #ifdef CONFIG_CIFS_EXPERIMENTAL
668 .dir_notify = cifs_dir_notify,
669 #endif /* CONFIG_CIFS_EXPERIMENTAL */
672 const struct file_operations cifs_file_direct_ops = {
673 /* no mmap, no aio, no readv -
674 BB reevaluate whether they can be done with directio, no cache */
675 .read = cifs_user_read,
676 .write = cifs_user_write,
678 .release = cifs_close,
682 .splice_read = generic_file_splice_read,
683 #ifdef CONFIG_CIFS_POSIX
685 #endif /* CONFIG_CIFS_POSIX */
686 .llseek = cifs_llseek,
687 #ifdef CONFIG_CIFS_EXPERIMENTAL
688 .dir_notify = cifs_dir_notify,
689 #endif /* CONFIG_CIFS_EXPERIMENTAL */
691 const struct file_operations cifs_file_nobrl_ops = {
692 .read = do_sync_read,
693 .write = do_sync_write,
694 .aio_read = generic_file_aio_read,
695 .aio_write = cifs_file_aio_write,
697 .release = cifs_close,
700 .mmap = cifs_file_mmap,
701 .splice_read = generic_file_splice_read,
702 .llseek = cifs_llseek,
703 #ifdef CONFIG_CIFS_POSIX
705 #endif /* CONFIG_CIFS_POSIX */
707 #ifdef CONFIG_CIFS_EXPERIMENTAL
708 .dir_notify = cifs_dir_notify,
709 #endif /* CONFIG_CIFS_EXPERIMENTAL */
712 const struct file_operations cifs_file_direct_nobrl_ops = {
713 /* no mmap, no aio, no readv -
714 BB reevaluate whether they can be done with directio, no cache */
715 .read = cifs_user_read,
716 .write = cifs_user_write,
718 .release = cifs_close,
721 .splice_read = generic_file_splice_read,
722 #ifdef CONFIG_CIFS_POSIX
724 #endif /* CONFIG_CIFS_POSIX */
725 .llseek = cifs_llseek,
726 #ifdef CONFIG_CIFS_EXPERIMENTAL
727 .dir_notify = cifs_dir_notify,
728 #endif /* CONFIG_CIFS_EXPERIMENTAL */
731 const struct file_operations cifs_dir_ops = {
732 .readdir = cifs_readdir,
733 .release = cifs_closedir,
734 .read = generic_read_dir,
735 #ifdef CONFIG_CIFS_EXPERIMENTAL
736 .dir_notify = cifs_dir_notify,
737 #endif /* CONFIG_CIFS_EXPERIMENTAL */
742 cifs_init_once(struct kmem_cache *cachep, void *inode)
744 struct cifsInodeInfo *cifsi = inode;
746 inode_init_once(&cifsi->vfs_inode);
747 INIT_LIST_HEAD(&cifsi->lockList);
751 cifs_init_inodecache(void)
753 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
754 sizeof(struct cifsInodeInfo),
755 0, (SLAB_RECLAIM_ACCOUNT|
758 if (cifs_inode_cachep == NULL)
765 cifs_destroy_inodecache(void)
767 kmem_cache_destroy(cifs_inode_cachep);
771 cifs_init_request_bufs(void)
773 if (CIFSMaxBufSize < 8192) {
774 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
775 Unicode path name has to fit in any SMB/CIFS path based frames */
776 CIFSMaxBufSize = 8192;
777 } else if (CIFSMaxBufSize > 1024*127) {
778 CIFSMaxBufSize = 1024 * 127;
780 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
782 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
783 cifs_req_cachep = kmem_cache_create("cifs_request",
785 MAX_CIFS_HDR_SIZE, 0,
786 SLAB_HWCACHE_ALIGN, NULL);
787 if (cifs_req_cachep == NULL)
790 if (cifs_min_rcv < 1)
792 else if (cifs_min_rcv > 64) {
794 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
797 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
800 if (cifs_req_poolp == NULL) {
801 kmem_cache_destroy(cifs_req_cachep);
804 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
805 almost all handle based requests (but not write response, nor is it
806 sufficient for path based requests). A smaller size would have
807 been more efficient (compacting multiple slab items on one 4k page)
808 for the case in which debug was on, but this larger size allows
809 more SMBs to use small buffer alloc and is still much more
810 efficient to alloc 1 per page off the slab compared to 17K (5page)
811 alloc of large cifs buffers even when page debugging is on */
812 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
813 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
815 if (cifs_sm_req_cachep == NULL) {
816 mempool_destroy(cifs_req_poolp);
817 kmem_cache_destroy(cifs_req_cachep);
821 if (cifs_min_small < 2)
823 else if (cifs_min_small > 256) {
824 cifs_min_small = 256;
825 cFYI(1, ("cifs_min_small set to maximum (256)"));
828 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
831 if (cifs_sm_req_poolp == NULL) {
832 mempool_destroy(cifs_req_poolp);
833 kmem_cache_destroy(cifs_req_cachep);
834 kmem_cache_destroy(cifs_sm_req_cachep);
842 cifs_destroy_request_bufs(void)
844 mempool_destroy(cifs_req_poolp);
845 kmem_cache_destroy(cifs_req_cachep);
846 mempool_destroy(cifs_sm_req_poolp);
847 kmem_cache_destroy(cifs_sm_req_cachep);
853 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
854 sizeof(struct mid_q_entry), 0,
855 SLAB_HWCACHE_ALIGN, NULL);
856 if (cifs_mid_cachep == NULL)
859 /* 3 is a reasonable minimum number of simultaneous operations */
860 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
861 if (cifs_mid_poolp == NULL) {
862 kmem_cache_destroy(cifs_mid_cachep);
866 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
867 sizeof(struct oplock_q_entry), 0,
868 SLAB_HWCACHE_ALIGN, NULL);
869 if (cifs_oplock_cachep == NULL) {
870 mempool_destroy(cifs_mid_poolp);
871 kmem_cache_destroy(cifs_mid_cachep);
879 cifs_destroy_mids(void)
881 mempool_destroy(cifs_mid_poolp);
882 kmem_cache_destroy(cifs_mid_cachep);
883 kmem_cache_destroy(cifs_oplock_cachep);
886 static int cifs_oplock_thread(void *dummyarg)
888 struct oplock_q_entry *oplock_item;
889 struct cifsTconInfo *pTcon;
899 spin_lock(&GlobalMid_Lock);
900 if (list_empty(&GlobalOplock_Q)) {
901 spin_unlock(&GlobalMid_Lock);
902 set_current_state(TASK_INTERRUPTIBLE);
903 schedule_timeout(39*HZ);
905 oplock_item = list_entry(GlobalOplock_Q.next,
906 struct oplock_q_entry, qhead);
908 cFYI(1, ("found oplock item to write out"));
909 pTcon = oplock_item->tcon;
910 inode = oplock_item->pinode;
911 netfid = oplock_item->netfid;
912 spin_unlock(&GlobalMid_Lock);
913 DeleteOplockQEntry(oplock_item);
914 /* can not grab inode sem here since it would
915 deadlock when oplock received on delete
916 since vfs_unlink holds the i_mutex across
918 /* mutex_lock(&inode->i_mutex);*/
919 if (S_ISREG(inode->i_mode)) {
921 filemap_fdatawrite(inode->i_mapping);
922 if (CIFS_I(inode)->clientCanCacheRead
924 waitrc = filemap_fdatawait(inode->i_mapping);
925 invalidate_remote_inode(inode);
931 /* mutex_unlock(&inode->i_mutex);*/
933 CIFS_I(inode)->write_behind_rc = rc;
934 cFYI(1, ("Oplock flush inode %p rc %d",
937 /* releasing stale oplock after recent reconnect
938 of smb session using a now incorrect file
939 handle is not a data integrity issue but do
940 not bother sending an oplock release if session
941 to server still is disconnected since oplock
942 already released by the server in that case */
943 if (pTcon->tidStatus != CifsNeedReconnect) {
944 rc = CIFSSMBLock(0, pTcon, netfid,
945 0 /* len */ , 0 /* offset */, 0,
946 0, LOCKING_ANDX_OPLOCK_RELEASE,
948 cFYI(1, ("Oplock release rc = %d", rc));
951 spin_unlock(&GlobalMid_Lock);
952 set_current_state(TASK_INTERRUPTIBLE);
953 schedule_timeout(1); /* yield in case q were corrupt */
955 } while (!kthread_should_stop());
960 static int cifs_dnotify_thread(void *dummyarg)
962 struct list_head *tmp;
963 struct cifsSesInfo *ses;
968 set_current_state(TASK_INTERRUPTIBLE);
969 schedule_timeout(15*HZ);
970 read_lock(&GlobalSMBSeslock);
971 /* check if any stuck requests that need
972 to be woken up and wakeq so the
973 thread can wake up and error out */
974 list_for_each(tmp, &GlobalSMBSessionList) {
975 ses = list_entry(tmp, struct cifsSesInfo,
977 if (ses && ses->server &&
978 atomic_read(&ses->server->inFlight))
979 wake_up_all(&ses->server->response_q);
981 read_unlock(&GlobalSMBSeslock);
982 } while (!kthread_should_stop());
991 #ifdef CONFIG_PROC_FS
994 /* INIT_LIST_HEAD(&GlobalServerList);*/ /* BB not implemented yet */
995 INIT_LIST_HEAD(&GlobalSMBSessionList);
996 INIT_LIST_HEAD(&GlobalTreeConnectionList);
997 INIT_LIST_HEAD(&GlobalOplock_Q);
998 #ifdef CONFIG_CIFS_EXPERIMENTAL
999 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1000 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1003 * Initialize Global counters
1005 atomic_set(&sesInfoAllocCount, 0);
1006 atomic_set(&tconInfoAllocCount, 0);
1007 atomic_set(&tcpSesAllocCount, 0);
1008 atomic_set(&tcpSesReconnectCount, 0);
1009 atomic_set(&tconInfoReconnectCount, 0);
1011 atomic_set(&bufAllocCount, 0);
1012 atomic_set(&smBufAllocCount, 0);
1013 #ifdef CONFIG_CIFS_STATS2
1014 atomic_set(&totBufAllocCount, 0);
1015 atomic_set(&totSmBufAllocCount, 0);
1016 #endif /* CONFIG_CIFS_STATS2 */
1018 atomic_set(&midCount, 0);
1019 GlobalCurrentXid = 0;
1020 GlobalTotalActiveXid = 0;
1021 GlobalMaxActiveXid = 0;
1022 memset(Local_System_Name, 0, 15);
1023 rwlock_init(&GlobalSMBSeslock);
1024 spin_lock_init(&GlobalMid_Lock);
1026 if (cifs_max_pending < 2) {
1027 cifs_max_pending = 2;
1028 cFYI(1, ("cifs_max_pending set to min of 2"));
1029 } else if (cifs_max_pending > 256) {
1030 cifs_max_pending = 256;
1031 cFYI(1, ("cifs_max_pending set to max of 256"));
1034 rc = cifs_init_inodecache();
1036 goto out_clean_proc;
1038 rc = cifs_init_mids();
1040 goto out_destroy_inodecache;
1042 rc = cifs_init_request_bufs();
1044 goto out_destroy_mids;
1046 rc = register_filesystem(&cifs_fs_type);
1048 goto out_destroy_request_bufs;
1049 #ifdef CONFIG_CIFS_UPCALL
1050 rc = register_key_type(&cifs_spnego_key_type);
1052 goto out_unregister_filesystem;
1054 #ifdef CONFIG_CIFS_DFS_UPCALL
1055 rc = register_key_type(&key_type_dns_resolver);
1057 goto out_unregister_key_type;
1059 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1060 if (IS_ERR(oplockThread)) {
1061 rc = PTR_ERR(oplockThread);
1062 cERROR(1, ("error %d create oplock thread", rc));
1063 goto out_unregister_dfs_key_type;
1066 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1067 if (IS_ERR(dnotifyThread)) {
1068 rc = PTR_ERR(dnotifyThread);
1069 cERROR(1, ("error %d create dnotify thread", rc));
1070 goto out_stop_oplock_thread;
1075 out_stop_oplock_thread:
1076 kthread_stop(oplockThread);
1077 out_unregister_dfs_key_type:
1078 #ifdef CONFIG_CIFS_DFS_UPCALL
1079 unregister_key_type(&key_type_dns_resolver);
1080 out_unregister_key_type:
1082 #ifdef CONFIG_CIFS_UPCALL
1083 unregister_key_type(&cifs_spnego_key_type);
1084 out_unregister_filesystem:
1086 unregister_filesystem(&cifs_fs_type);
1087 out_destroy_request_bufs:
1088 cifs_destroy_request_bufs();
1090 cifs_destroy_mids();
1091 out_destroy_inodecache:
1092 cifs_destroy_inodecache();
1094 #ifdef CONFIG_PROC_FS
1103 cFYI(0, ("exit_cifs"));
1104 #ifdef CONFIG_PROC_FS
1107 #ifdef CONFIG_CIFS_DFS_UPCALL
1108 unregister_key_type(&key_type_dns_resolver);
1110 #ifdef CONFIG_CIFS_UPCALL
1111 unregister_key_type(&cifs_spnego_key_type);
1113 unregister_filesystem(&cifs_fs_type);
1114 cifs_destroy_inodecache();
1115 cifs_destroy_mids();
1116 cifs_destroy_request_bufs();
1117 kthread_stop(oplockThread);
1118 kthread_stop(dnotifyThread);
1121 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1122 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1124 ("VFS to access servers complying with the SNIA CIFS Specification "
1125 "e.g. Samba and Windows");
1126 MODULE_VERSION(CIFS_VERSION);
1127 module_init(init_cifs)
1128 module_exit(exit_cifs)