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 #ifdef CONFIG_CIFS_DFS_UPCALL
475 dfs_shrink_umount_helper(vfsmnt);
476 #endif /* CONFIG CIFS_DFS_UPCALL */
478 if (!(flags & MNT_FORCE))
480 cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
484 tcon = cifs_sb->tcon;
487 down(&tcon->tconSem);
488 if (atomic_read(&tcon->useCount) == 1)
489 tcon->tidStatus = CifsExiting;
492 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
493 /* cancel_notify_requests(tcon); */
494 if (tcon->ses && tcon->ses->server) {
495 cFYI(1, ("wake up tasks now - umount begin not complete"));
496 wake_up_all(&tcon->ses->server->request_q);
497 wake_up_all(&tcon->ses->server->response_q);
498 msleep(1); /* yield */
499 /* we have to kick the requests once more */
500 wake_up_all(&tcon->ses->server->response_q);
503 /* BB FIXME - finish add checks for tidStatus BB */
508 #ifdef CONFIG_CIFS_STATS2
509 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
516 static int cifs_remount(struct super_block *sb, int *flags, char *data)
518 *flags |= MS_NODIRATIME;
522 static const struct super_operations cifs_super_ops = {
523 .read_inode = cifs_read_inode,
524 .put_super = cifs_put_super,
525 .statfs = cifs_statfs,
526 .alloc_inode = cifs_alloc_inode,
527 .destroy_inode = cifs_destroy_inode,
528 /* .drop_inode = generic_delete_inode,
529 .delete_inode = cifs_delete_inode, */ /* Do not need above two
530 functions unless later we add lazy close of inodes or unless the
531 kernel forgets to call us with the same number of releases (closes)
533 .show_options = cifs_show_options,
534 .umount_begin = cifs_umount_begin,
535 .remount_fs = cifs_remount,
536 #ifdef CONFIG_CIFS_STATS2
537 .show_stats = cifs_show_stats,
542 cifs_get_sb(struct file_system_type *fs_type,
543 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
546 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
548 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
555 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
557 up_write(&sb->s_umount);
558 deactivate_super(sb);
561 sb->s_flags |= MS_ACTIVE;
562 return simple_set_mnt(mnt, sb);
565 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
566 unsigned long nr_segs, loff_t pos)
568 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
571 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
572 if (!CIFS_I(inode)->clientCanCacheAll)
573 filemap_fdatawrite(inode->i_mapping);
577 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
579 /* origin == SEEK_END => we must revalidate the cached file length */
580 if (origin == SEEK_END) {
583 /* some applications poll for the file length in this strange
584 way so we must seek to end on non-oplocked files by
585 setting the revalidate time to zero */
586 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
588 retval = cifs_revalidate(file->f_path.dentry);
590 return (loff_t)retval;
592 return remote_llseek(file, offset, origin);
595 struct file_system_type cifs_fs_type = {
596 .owner = THIS_MODULE,
598 .get_sb = cifs_get_sb,
599 .kill_sb = kill_anon_super,
602 const struct inode_operations cifs_dir_inode_ops = {
603 .create = cifs_create,
604 .lookup = cifs_lookup,
605 .getattr = cifs_getattr,
606 .unlink = cifs_unlink,
607 .link = cifs_hardlink,
610 .rename = cifs_rename,
611 .permission = cifs_permission,
612 /* revalidate:cifs_revalidate, */
613 .setattr = cifs_setattr,
614 .symlink = cifs_symlink,
616 #ifdef CONFIG_CIFS_XATTR
617 .setxattr = cifs_setxattr,
618 .getxattr = cifs_getxattr,
619 .listxattr = cifs_listxattr,
620 .removexattr = cifs_removexattr,
624 const struct inode_operations cifs_file_inode_ops = {
625 /* revalidate:cifs_revalidate, */
626 .setattr = cifs_setattr,
627 .getattr = cifs_getattr, /* do we need this anymore? */
628 .rename = cifs_rename,
629 .permission = cifs_permission,
630 #ifdef CONFIG_CIFS_XATTR
631 .setxattr = cifs_setxattr,
632 .getxattr = cifs_getxattr,
633 .listxattr = cifs_listxattr,
634 .removexattr = cifs_removexattr,
638 const struct inode_operations cifs_symlink_inode_ops = {
639 .readlink = generic_readlink,
640 .follow_link = cifs_follow_link,
641 .put_link = cifs_put_link,
642 .permission = cifs_permission,
643 /* BB add the following two eventually */
644 /* revalidate: cifs_revalidate,
645 setattr: cifs_notify_change, *//* BB do we need notify change */
646 #ifdef CONFIG_CIFS_XATTR
647 .setxattr = cifs_setxattr,
648 .getxattr = cifs_getxattr,
649 .listxattr = cifs_listxattr,
650 .removexattr = cifs_removexattr,
654 const struct file_operations cifs_file_ops = {
655 .read = do_sync_read,
656 .write = do_sync_write,
657 .aio_read = generic_file_aio_read,
658 .aio_write = cifs_file_aio_write,
660 .release = cifs_close,
664 .mmap = cifs_file_mmap,
665 .splice_read = generic_file_splice_read,
666 .llseek = cifs_llseek,
667 #ifdef CONFIG_CIFS_POSIX
669 #endif /* CONFIG_CIFS_POSIX */
671 #ifdef CONFIG_CIFS_EXPERIMENTAL
672 .dir_notify = cifs_dir_notify,
673 #endif /* CONFIG_CIFS_EXPERIMENTAL */
676 const struct file_operations cifs_file_direct_ops = {
677 /* no mmap, no aio, no readv -
678 BB reevaluate whether they can be done with directio, no cache */
679 .read = cifs_user_read,
680 .write = cifs_user_write,
682 .release = cifs_close,
686 .splice_read = generic_file_splice_read,
687 #ifdef CONFIG_CIFS_POSIX
689 #endif /* CONFIG_CIFS_POSIX */
690 .llseek = cifs_llseek,
691 #ifdef CONFIG_CIFS_EXPERIMENTAL
692 .dir_notify = cifs_dir_notify,
693 #endif /* CONFIG_CIFS_EXPERIMENTAL */
695 const struct file_operations cifs_file_nobrl_ops = {
696 .read = do_sync_read,
697 .write = do_sync_write,
698 .aio_read = generic_file_aio_read,
699 .aio_write = cifs_file_aio_write,
701 .release = cifs_close,
704 .mmap = cifs_file_mmap,
705 .splice_read = generic_file_splice_read,
706 .llseek = cifs_llseek,
707 #ifdef CONFIG_CIFS_POSIX
709 #endif /* CONFIG_CIFS_POSIX */
711 #ifdef CONFIG_CIFS_EXPERIMENTAL
712 .dir_notify = cifs_dir_notify,
713 #endif /* CONFIG_CIFS_EXPERIMENTAL */
716 const struct file_operations cifs_file_direct_nobrl_ops = {
717 /* no mmap, no aio, no readv -
718 BB reevaluate whether they can be done with directio, no cache */
719 .read = cifs_user_read,
720 .write = cifs_user_write,
722 .release = cifs_close,
725 .splice_read = generic_file_splice_read,
726 #ifdef CONFIG_CIFS_POSIX
728 #endif /* CONFIG_CIFS_POSIX */
729 .llseek = cifs_llseek,
730 #ifdef CONFIG_CIFS_EXPERIMENTAL
731 .dir_notify = cifs_dir_notify,
732 #endif /* CONFIG_CIFS_EXPERIMENTAL */
735 const struct file_operations cifs_dir_ops = {
736 .readdir = cifs_readdir,
737 .release = cifs_closedir,
738 .read = generic_read_dir,
739 #ifdef CONFIG_CIFS_EXPERIMENTAL
740 .dir_notify = cifs_dir_notify,
741 #endif /* CONFIG_CIFS_EXPERIMENTAL */
746 cifs_init_once(struct kmem_cache *cachep, void *inode)
748 struct cifsInodeInfo *cifsi = inode;
750 inode_init_once(&cifsi->vfs_inode);
751 INIT_LIST_HEAD(&cifsi->lockList);
755 cifs_init_inodecache(void)
757 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
758 sizeof(struct cifsInodeInfo),
759 0, (SLAB_RECLAIM_ACCOUNT|
762 if (cifs_inode_cachep == NULL)
769 cifs_destroy_inodecache(void)
771 kmem_cache_destroy(cifs_inode_cachep);
775 cifs_init_request_bufs(void)
777 if (CIFSMaxBufSize < 8192) {
778 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
779 Unicode path name has to fit in any SMB/CIFS path based frames */
780 CIFSMaxBufSize = 8192;
781 } else if (CIFSMaxBufSize > 1024*127) {
782 CIFSMaxBufSize = 1024 * 127;
784 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
786 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
787 cifs_req_cachep = kmem_cache_create("cifs_request",
789 MAX_CIFS_HDR_SIZE, 0,
790 SLAB_HWCACHE_ALIGN, NULL);
791 if (cifs_req_cachep == NULL)
794 if (cifs_min_rcv < 1)
796 else if (cifs_min_rcv > 64) {
798 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
801 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
804 if (cifs_req_poolp == NULL) {
805 kmem_cache_destroy(cifs_req_cachep);
808 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
809 almost all handle based requests (but not write response, nor is it
810 sufficient for path based requests). A smaller size would have
811 been more efficient (compacting multiple slab items on one 4k page)
812 for the case in which debug was on, but this larger size allows
813 more SMBs to use small buffer alloc and is still much more
814 efficient to alloc 1 per page off the slab compared to 17K (5page)
815 alloc of large cifs buffers even when page debugging is on */
816 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
817 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
819 if (cifs_sm_req_cachep == NULL) {
820 mempool_destroy(cifs_req_poolp);
821 kmem_cache_destroy(cifs_req_cachep);
825 if (cifs_min_small < 2)
827 else if (cifs_min_small > 256) {
828 cifs_min_small = 256;
829 cFYI(1, ("cifs_min_small set to maximum (256)"));
832 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
835 if (cifs_sm_req_poolp == NULL) {
836 mempool_destroy(cifs_req_poolp);
837 kmem_cache_destroy(cifs_req_cachep);
838 kmem_cache_destroy(cifs_sm_req_cachep);
846 cifs_destroy_request_bufs(void)
848 mempool_destroy(cifs_req_poolp);
849 kmem_cache_destroy(cifs_req_cachep);
850 mempool_destroy(cifs_sm_req_poolp);
851 kmem_cache_destroy(cifs_sm_req_cachep);
857 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
858 sizeof(struct mid_q_entry), 0,
859 SLAB_HWCACHE_ALIGN, NULL);
860 if (cifs_mid_cachep == NULL)
863 /* 3 is a reasonable minimum number of simultaneous operations */
864 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
865 if (cifs_mid_poolp == NULL) {
866 kmem_cache_destroy(cifs_mid_cachep);
870 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
871 sizeof(struct oplock_q_entry), 0,
872 SLAB_HWCACHE_ALIGN, NULL);
873 if (cifs_oplock_cachep == NULL) {
874 mempool_destroy(cifs_mid_poolp);
875 kmem_cache_destroy(cifs_mid_cachep);
883 cifs_destroy_mids(void)
885 mempool_destroy(cifs_mid_poolp);
886 kmem_cache_destroy(cifs_mid_cachep);
887 kmem_cache_destroy(cifs_oplock_cachep);
890 static int cifs_oplock_thread(void *dummyarg)
892 struct oplock_q_entry *oplock_item;
893 struct cifsTconInfo *pTcon;
903 spin_lock(&GlobalMid_Lock);
904 if (list_empty(&GlobalOplock_Q)) {
905 spin_unlock(&GlobalMid_Lock);
906 set_current_state(TASK_INTERRUPTIBLE);
907 schedule_timeout(39*HZ);
909 oplock_item = list_entry(GlobalOplock_Q.next,
910 struct oplock_q_entry, qhead);
912 cFYI(1, ("found oplock item to write out"));
913 pTcon = oplock_item->tcon;
914 inode = oplock_item->pinode;
915 netfid = oplock_item->netfid;
916 spin_unlock(&GlobalMid_Lock);
917 DeleteOplockQEntry(oplock_item);
918 /* can not grab inode sem here since it would
919 deadlock when oplock received on delete
920 since vfs_unlink holds the i_mutex across
922 /* mutex_lock(&inode->i_mutex);*/
923 if (S_ISREG(inode->i_mode)) {
925 filemap_fdatawrite(inode->i_mapping);
926 if (CIFS_I(inode)->clientCanCacheRead
928 waitrc = filemap_fdatawait(inode->i_mapping);
929 invalidate_remote_inode(inode);
935 /* mutex_unlock(&inode->i_mutex);*/
937 CIFS_I(inode)->write_behind_rc = rc;
938 cFYI(1, ("Oplock flush inode %p rc %d",
941 /* releasing stale oplock after recent reconnect
942 of smb session using a now incorrect file
943 handle is not a data integrity issue but do
944 not bother sending an oplock release if session
945 to server still is disconnected since oplock
946 already released by the server in that case */
947 if (pTcon->tidStatus != CifsNeedReconnect) {
948 rc = CIFSSMBLock(0, pTcon, netfid,
949 0 /* len */ , 0 /* offset */, 0,
950 0, LOCKING_ANDX_OPLOCK_RELEASE,
952 cFYI(1, ("Oplock release rc = %d", rc));
955 spin_unlock(&GlobalMid_Lock);
956 set_current_state(TASK_INTERRUPTIBLE);
957 schedule_timeout(1); /* yield in case q were corrupt */
959 } while (!kthread_should_stop());
964 static int cifs_dnotify_thread(void *dummyarg)
966 struct list_head *tmp;
967 struct cifsSesInfo *ses;
972 set_current_state(TASK_INTERRUPTIBLE);
973 schedule_timeout(15*HZ);
974 read_lock(&GlobalSMBSeslock);
975 /* check if any stuck requests that need
976 to be woken up and wakeq so the
977 thread can wake up and error out */
978 list_for_each(tmp, &GlobalSMBSessionList) {
979 ses = list_entry(tmp, struct cifsSesInfo,
981 if (ses && ses->server &&
982 atomic_read(&ses->server->inFlight))
983 wake_up_all(&ses->server->response_q);
985 read_unlock(&GlobalSMBSeslock);
986 } while (!kthread_should_stop());
995 #ifdef CONFIG_PROC_FS
998 /* INIT_LIST_HEAD(&GlobalServerList);*/ /* BB not implemented yet */
999 INIT_LIST_HEAD(&GlobalSMBSessionList);
1000 INIT_LIST_HEAD(&GlobalTreeConnectionList);
1001 INIT_LIST_HEAD(&GlobalOplock_Q);
1002 #ifdef CONFIG_CIFS_EXPERIMENTAL
1003 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1004 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1007 * Initialize Global counters
1009 atomic_set(&sesInfoAllocCount, 0);
1010 atomic_set(&tconInfoAllocCount, 0);
1011 atomic_set(&tcpSesAllocCount, 0);
1012 atomic_set(&tcpSesReconnectCount, 0);
1013 atomic_set(&tconInfoReconnectCount, 0);
1015 atomic_set(&bufAllocCount, 0);
1016 atomic_set(&smBufAllocCount, 0);
1017 #ifdef CONFIG_CIFS_STATS2
1018 atomic_set(&totBufAllocCount, 0);
1019 atomic_set(&totSmBufAllocCount, 0);
1020 #endif /* CONFIG_CIFS_STATS2 */
1022 atomic_set(&midCount, 0);
1023 GlobalCurrentXid = 0;
1024 GlobalTotalActiveXid = 0;
1025 GlobalMaxActiveXid = 0;
1026 memset(Local_System_Name, 0, 15);
1027 rwlock_init(&GlobalSMBSeslock);
1028 spin_lock_init(&GlobalMid_Lock);
1030 if (cifs_max_pending < 2) {
1031 cifs_max_pending = 2;
1032 cFYI(1, ("cifs_max_pending set to min of 2"));
1033 } else if (cifs_max_pending > 256) {
1034 cifs_max_pending = 256;
1035 cFYI(1, ("cifs_max_pending set to max of 256"));
1038 rc = cifs_init_inodecache();
1040 goto out_clean_proc;
1042 rc = cifs_init_mids();
1044 goto out_destroy_inodecache;
1046 rc = cifs_init_request_bufs();
1048 goto out_destroy_mids;
1050 rc = register_filesystem(&cifs_fs_type);
1052 goto out_destroy_request_bufs;
1053 #ifdef CONFIG_CIFS_UPCALL
1054 rc = register_key_type(&cifs_spnego_key_type);
1056 goto out_unregister_filesystem;
1058 #ifdef CONFIG_CIFS_DFS_UPCALL
1059 rc = register_key_type(&key_type_dns_resolver);
1061 goto out_unregister_key_type;
1063 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1064 if (IS_ERR(oplockThread)) {
1065 rc = PTR_ERR(oplockThread);
1066 cERROR(1, ("error %d create oplock thread", rc));
1067 goto out_unregister_dfs_key_type;
1070 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1071 if (IS_ERR(dnotifyThread)) {
1072 rc = PTR_ERR(dnotifyThread);
1073 cERROR(1, ("error %d create dnotify thread", rc));
1074 goto out_stop_oplock_thread;
1079 out_stop_oplock_thread:
1080 kthread_stop(oplockThread);
1081 out_unregister_dfs_key_type:
1082 #ifdef CONFIG_CIFS_DFS_UPCALL
1083 unregister_key_type(&key_type_dns_resolver);
1084 out_unregister_key_type:
1086 #ifdef CONFIG_CIFS_UPCALL
1087 unregister_key_type(&cifs_spnego_key_type);
1088 out_unregister_filesystem:
1090 unregister_filesystem(&cifs_fs_type);
1091 out_destroy_request_bufs:
1092 cifs_destroy_request_bufs();
1094 cifs_destroy_mids();
1095 out_destroy_inodecache:
1096 cifs_destroy_inodecache();
1098 #ifdef CONFIG_PROC_FS
1107 cFYI(0, ("exit_cifs"));
1108 #ifdef CONFIG_PROC_FS
1111 #ifdef CONFIG_CIFS_DFS_UPCALL
1112 unregister_key_type(&key_type_dns_resolver);
1114 #ifdef CONFIG_CIFS_UPCALL
1115 unregister_key_type(&cifs_spnego_key_type);
1117 unregister_filesystem(&cifs_fs_type);
1118 cifs_destroy_inodecache();
1119 cifs_destroy_mids();
1120 cifs_destroy_request_bufs();
1121 kthread_stop(oplockThread);
1122 kthread_stop(dnotifyThread);
1125 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1126 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1128 ("VFS to access servers complying with the SNIA CIFS Specification "
1129 "e.g. Samba and Windows");
1130 MODULE_VERSION(CIFS_VERSION);
1131 module_init(init_cifs)
1132 module_exit(exit_cifs)