4 * Copyright (C) International Business Machines Corp., 2002,2004
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>
39 #define DECLARE_GLOBALS_HERE
41 #include "cifsproto.h"
42 #include "cifs_debug.h"
43 #include "cifs_fs_sb.h"
45 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
47 #ifdef CONFIG_CIFS_QUOTA
48 static struct quotactl_ops cifs_quotactl_ops;
54 unsigned int oplockEnabled = 1;
55 unsigned int experimEnabled = 0;
56 unsigned int linuxExtEnabled = 1;
57 unsigned int lookupCacheEnabled = 1;
58 unsigned int multiuser_mount = 0;
59 unsigned int extended_security = CIFSSEC_DEF;
60 /* unsigned int ntlmv2_support = 0; */
61 unsigned int sign_CIFS_PDUs = 1;
62 extern struct task_struct * oplockThread; /* remove sparse warning */
63 struct task_struct * oplockThread = NULL;
64 extern struct task_struct * dnotifyThread; /* remove sparse warning */
65 struct task_struct * dnotifyThread = NULL;
66 static struct super_operations cifs_super_ops;
67 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
68 module_param(CIFSMaxBufSize, int, 0);
69 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
70 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
71 module_param(cifs_min_rcv, int, 0);
72 MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
73 unsigned int cifs_min_small = 30;
74 module_param(cifs_min_small, int, 0);
75 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
76 unsigned int cifs_max_pending = CIFS_MAX_REQ;
77 module_param(cifs_max_pending, int, 0);
78 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
80 extern mempool_t *cifs_sm_req_poolp;
81 extern mempool_t *cifs_req_poolp;
82 extern mempool_t *cifs_mid_poolp;
84 extern kmem_cache_t *cifs_oplock_cachep;
87 cifs_read_super(struct super_block *sb, void *data,
88 const char *devname, int silent)
91 struct cifs_sb_info *cifs_sb;
94 sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
95 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
96 cifs_sb = CIFS_SB(sb);
100 rc = cifs_mount(sb, cifs_sb, data, devname);
105 ("cifs_mount failed w/return code = %d", rc));
106 goto out_mount_failed;
109 sb->s_magic = CIFS_MAGIC_NUMBER;
110 sb->s_op = &cifs_super_ops;
111 /* if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
112 sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
113 #ifdef CONFIG_CIFS_QUOTA
114 sb->s_qcop = &cifs_quotactl_ops;
116 sb->s_blocksize = CIFS_MAX_MSGSIZE;
117 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
118 inode = iget(sb, ROOT_I);
125 sb->s_root = d_alloc_root(inode);
135 cERROR(1, ("cifs_read_super: get root inode failed"));
141 if(cifs_sb->local_nls)
142 unload_nls(cifs_sb->local_nls);
149 cifs_put_super(struct super_block *sb)
152 struct cifs_sb_info *cifs_sb;
154 cFYI(1, ("In cifs_put_super"));
155 cifs_sb = CIFS_SB(sb);
156 if(cifs_sb == NULL) {
157 cFYI(1,("Empty cifs superblock info passed to unmount"));
160 rc = cifs_umount(sb, cifs_sb);
162 cERROR(1, ("cifs_umount failed with return code %d", rc));
164 unload_nls(cifs_sb->local_nls);
170 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
172 struct super_block *sb = dentry->d_sb;
174 int rc = -EOPNOTSUPP;
175 struct cifs_sb_info *cifs_sb;
176 struct cifsTconInfo *pTcon;
180 cifs_sb = CIFS_SB(sb);
181 pTcon = cifs_sb->tcon;
183 buf->f_type = CIFS_MAGIC_NUMBER;
185 /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
186 buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
187 presumably be total path, but note
188 that some servers (includinng Samba 3)
189 have a shorter maximum path */
190 buf->f_files = 0; /* undefined */
191 buf->f_ffree = 0; /* unlimited */
193 /* BB we could add a second check for a QFS Unix capability bit */
194 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
195 if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
196 le64_to_cpu(pTcon->fsUnixInfo.Capability)))
197 rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
199 /* Only need to call the old QFSInfo if failed
202 if(pTcon->ses->capabilities & CAP_NT_SMBS)
203 rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* not supported by OS2 */
205 /* Some old Windows servers also do not support level 103, retry with
206 older level one if old server failed the previous call or we
207 bypassed it because we detected that this was an older LANMAN sess */
209 rc = SMBOldQFSInfo(xid, pTcon, buf);
214 /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
216 return 0; /* always return success? what if volume is no
220 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
222 struct cifs_sb_info *cifs_sb;
224 cifs_sb = CIFS_SB(inode->i_sb);
226 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
228 } else /* file mode might have been restricted at mount time
229 on the client (above and beyond ACL on servers) for
230 servers which do not support setting and viewing mode bits,
231 so allowing client to check permissions is useful */
232 return generic_permission(inode, mask, NULL);
235 static kmem_cache_t *cifs_inode_cachep;
236 static kmem_cache_t *cifs_req_cachep;
237 static kmem_cache_t *cifs_mid_cachep;
238 kmem_cache_t *cifs_oplock_cachep;
239 static kmem_cache_t *cifs_sm_req_cachep;
240 mempool_t *cifs_sm_req_poolp;
241 mempool_t *cifs_req_poolp;
242 mempool_t *cifs_mid_poolp;
244 static struct inode *
245 cifs_alloc_inode(struct super_block *sb)
247 struct cifsInodeInfo *cifs_inode;
248 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
251 cifs_inode->cifsAttrs = 0x20; /* default */
252 atomic_set(&cifs_inode->inUse, 0);
253 cifs_inode->time = 0;
254 /* Until the file is open and we have gotten oplock
255 info back from the server, can not assume caching of
256 file data or metadata */
257 cifs_inode->clientCanCacheRead = FALSE;
258 cifs_inode->clientCanCacheAll = FALSE;
259 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
260 cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
261 INIT_LIST_HEAD(&cifs_inode->openFileList);
262 return &cifs_inode->vfs_inode;
266 cifs_destroy_inode(struct inode *inode)
268 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
272 * cifs_show_options() is for displaying mount options in /proc/mounts.
273 * Not all settable options are displayed but most of the important
277 cifs_show_options(struct seq_file *s, struct vfsmount *m)
279 struct cifs_sb_info *cifs_sb;
281 cifs_sb = CIFS_SB(m->mnt_sb);
285 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
286 if (cifs_sb->tcon->ses) {
287 if (cifs_sb->tcon->ses->userName)
288 seq_printf(s, ",username=%s",
289 cifs_sb->tcon->ses->userName);
290 if(cifs_sb->tcon->ses->domainName)
291 seq_printf(s, ",domain=%s",
292 cifs_sb->tcon->ses->domainName);
295 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
296 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
301 #ifdef CONFIG_CIFS_QUOTA
302 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
303 struct fs_disk_quota * pdquota)
307 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
308 struct cifsTconInfo *pTcon;
311 pTcon = cifs_sb->tcon;
318 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
327 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
328 struct fs_disk_quota * pdquota)
332 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
333 struct cifsTconInfo *pTcon;
336 pTcon = cifs_sb->tcon;
342 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
351 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
355 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
356 struct cifsTconInfo *pTcon;
359 pTcon = cifs_sb->tcon;
365 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
374 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
378 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
379 struct cifsTconInfo *pTcon;
382 pTcon = cifs_sb->tcon;
388 cFYI(1,("pqstats %p",qstats));
397 static struct quotactl_ops cifs_quotactl_ops = {
398 .set_xquota = cifs_xquota_set,
399 .get_xquota = cifs_xquota_set,
400 .set_xstate = cifs_xstate_set,
401 .get_xstate = cifs_xstate_get,
405 static void cifs_umount_begin(struct vfsmount * vfsmnt, int flags)
407 struct cifs_sb_info *cifs_sb;
408 struct cifsTconInfo * tcon;
410 if (!(flags & MNT_FORCE))
412 cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
416 tcon = cifs_sb->tcon;
419 down(&tcon->tconSem);
420 if (atomic_read(&tcon->useCount) == 1)
421 tcon->tidStatus = CifsExiting;
424 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
425 /* cancel_notify_requests(tcon); */
426 if(tcon->ses && tcon->ses->server)
428 cFYI(1,("wake up tasks now - umount begin not complete"));
429 wake_up_all(&tcon->ses->server->request_q);
430 wake_up_all(&tcon->ses->server->response_q);
431 msleep(1); /* yield */
432 /* we have to kick the requests once more */
433 wake_up_all(&tcon->ses->server->response_q);
436 /* BB FIXME - finish add checks for tidStatus BB */
441 #ifdef CONFIG_CIFS_STATS2
442 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
449 static int cifs_remount(struct super_block *sb, int *flags, char *data)
451 *flags |= MS_NODIRATIME;
455 static struct super_operations cifs_super_ops = {
456 .read_inode = cifs_read_inode,
457 .put_super = cifs_put_super,
458 .statfs = cifs_statfs,
459 .alloc_inode = cifs_alloc_inode,
460 .destroy_inode = cifs_destroy_inode,
461 /* .drop_inode = generic_delete_inode,
462 .delete_inode = cifs_delete_inode, *//* Do not need the above two functions
463 unless later we add lazy close of inodes or unless the kernel forgets to call
464 us with the same number of releases (closes) as opens */
465 .show_options = cifs_show_options,
466 .umount_begin = cifs_umount_begin,
467 .remount_fs = cifs_remount,
468 #ifdef CONFIG_CIFS_STATS2
469 .show_stats = cifs_show_stats,
474 cifs_get_sb(struct file_system_type *fs_type,
475 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
478 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
480 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
487 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
489 up_write(&sb->s_umount);
490 deactivate_super(sb);
493 sb->s_flags |= MS_ACTIVE;
494 return simple_set_mnt(mnt, sb);
497 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
498 unsigned long nr_segs, loff_t pos)
500 struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
503 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
504 if (!CIFS_I(inode)->clientCanCacheAll)
505 filemap_fdatawrite(inode->i_mapping);
509 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
511 /* origin == SEEK_END => we must revalidate the cached file length */
512 if (origin == SEEK_END) {
513 int retval = cifs_revalidate(file->f_dentry);
515 return (loff_t)retval;
517 return remote_llseek(file, offset, origin);
520 static struct file_system_type cifs_fs_type = {
521 .owner = THIS_MODULE,
523 .get_sb = cifs_get_sb,
524 .kill_sb = kill_anon_super,
527 struct inode_operations cifs_dir_inode_ops = {
528 .create = cifs_create,
529 .lookup = cifs_lookup,
530 .getattr = cifs_getattr,
531 .unlink = cifs_unlink,
532 .link = cifs_hardlink,
535 .rename = cifs_rename,
536 .permission = cifs_permission,
537 /* revalidate:cifs_revalidate, */
538 .setattr = cifs_setattr,
539 .symlink = cifs_symlink,
541 #ifdef CONFIG_CIFS_XATTR
542 .setxattr = cifs_setxattr,
543 .getxattr = cifs_getxattr,
544 .listxattr = cifs_listxattr,
545 .removexattr = cifs_removexattr,
549 struct inode_operations cifs_file_inode_ops = {
550 /* revalidate:cifs_revalidate, */
551 .setattr = cifs_setattr,
552 .getattr = cifs_getattr, /* do we need this anymore? */
553 .rename = cifs_rename,
554 .permission = cifs_permission,
555 #ifdef CONFIG_CIFS_XATTR
556 .setxattr = cifs_setxattr,
557 .getxattr = cifs_getxattr,
558 .listxattr = cifs_listxattr,
559 .removexattr = cifs_removexattr,
563 struct inode_operations cifs_symlink_inode_ops = {
564 .readlink = generic_readlink,
565 .follow_link = cifs_follow_link,
566 .put_link = cifs_put_link,
567 .permission = cifs_permission,
568 /* BB add the following two eventually */
569 /* revalidate: cifs_revalidate,
570 setattr: cifs_notify_change, *//* BB do we need notify change */
571 #ifdef CONFIG_CIFS_XATTR
572 .setxattr = cifs_setxattr,
573 .getxattr = cifs_getxattr,
574 .listxattr = cifs_listxattr,
575 .removexattr = cifs_removexattr,
579 const struct file_operations cifs_file_ops = {
580 .read = do_sync_read,
581 .write = do_sync_write,
582 .aio_read = generic_file_aio_read,
583 .aio_write = cifs_file_aio_write,
585 .release = cifs_close,
589 .mmap = cifs_file_mmap,
590 .sendfile = generic_file_sendfile,
591 .llseek = cifs_llseek,
592 #ifdef CONFIG_CIFS_POSIX
594 #endif /* CONFIG_CIFS_POSIX */
596 #ifdef CONFIG_CIFS_EXPERIMENTAL
597 .dir_notify = cifs_dir_notify,
598 #endif /* CONFIG_CIFS_EXPERIMENTAL */
601 const struct file_operations cifs_file_direct_ops = {
602 /* no mmap, no aio, no readv -
603 BB reevaluate whether they can be done with directio, no cache */
604 .read = cifs_user_read,
605 .write = cifs_user_write,
607 .release = cifs_close,
611 .sendfile = generic_file_sendfile, /* BB removeme BB */
612 #ifdef CONFIG_CIFS_POSIX
614 #endif /* CONFIG_CIFS_POSIX */
615 .llseek = cifs_llseek,
616 #ifdef CONFIG_CIFS_EXPERIMENTAL
617 .dir_notify = cifs_dir_notify,
618 #endif /* CONFIG_CIFS_EXPERIMENTAL */
620 const struct file_operations cifs_file_nobrl_ops = {
621 .read = do_sync_read,
622 .write = do_sync_write,
623 .aio_read = generic_file_aio_read,
624 .aio_write = cifs_file_aio_write,
626 .release = cifs_close,
629 .mmap = cifs_file_mmap,
630 .sendfile = generic_file_sendfile,
631 .llseek = cifs_llseek,
632 #ifdef CONFIG_CIFS_POSIX
634 #endif /* CONFIG_CIFS_POSIX */
636 #ifdef CONFIG_CIFS_EXPERIMENTAL
637 .dir_notify = cifs_dir_notify,
638 #endif /* CONFIG_CIFS_EXPERIMENTAL */
641 const struct file_operations cifs_file_direct_nobrl_ops = {
642 /* no mmap, no aio, no readv -
643 BB reevaluate whether they can be done with directio, no cache */
644 .read = cifs_user_read,
645 .write = cifs_user_write,
647 .release = cifs_close,
650 .sendfile = generic_file_sendfile, /* BB removeme BB */
651 #ifdef CONFIG_CIFS_POSIX
653 #endif /* CONFIG_CIFS_POSIX */
654 .llseek = cifs_llseek,
655 #ifdef CONFIG_CIFS_EXPERIMENTAL
656 .dir_notify = cifs_dir_notify,
657 #endif /* CONFIG_CIFS_EXPERIMENTAL */
660 const struct file_operations cifs_dir_ops = {
661 .readdir = cifs_readdir,
662 .release = cifs_closedir,
663 .read = generic_read_dir,
664 #ifdef CONFIG_CIFS_EXPERIMENTAL
665 .dir_notify = cifs_dir_notify,
666 #endif /* CONFIG_CIFS_EXPERIMENTAL */
671 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
673 struct cifsInodeInfo *cifsi = inode;
675 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
676 SLAB_CTOR_CONSTRUCTOR) {
677 inode_init_once(&cifsi->vfs_inode);
678 INIT_LIST_HEAD(&cifsi->lockList);
683 cifs_init_inodecache(void)
685 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
686 sizeof (struct cifsInodeInfo),
687 0, (SLAB_RECLAIM_ACCOUNT|
689 cifs_init_once, NULL);
690 if (cifs_inode_cachep == NULL)
697 cifs_destroy_inodecache(void)
699 kmem_cache_destroy(cifs_inode_cachep);
703 cifs_init_request_bufs(void)
705 if(CIFSMaxBufSize < 8192) {
706 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
707 Unicode path name has to fit in any SMB/CIFS path based frames */
708 CIFSMaxBufSize = 8192;
709 } else if (CIFSMaxBufSize > 1024*127) {
710 CIFSMaxBufSize = 1024 * 127;
712 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
714 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
715 cifs_req_cachep = kmem_cache_create("cifs_request",
717 MAX_CIFS_HDR_SIZE, 0,
718 SLAB_HWCACHE_ALIGN, NULL, NULL);
719 if (cifs_req_cachep == NULL)
724 else if (cifs_min_rcv > 64) {
726 cERROR(1,("cifs_min_rcv set to maximum (64)"));
729 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
732 if(cifs_req_poolp == NULL) {
733 kmem_cache_destroy(cifs_req_cachep);
736 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
737 almost all handle based requests (but not write response, nor is it
738 sufficient for path based requests). A smaller size would have
739 been more efficient (compacting multiple slab items on one 4k page)
740 for the case in which debug was on, but this larger size allows
741 more SMBs to use small buffer alloc and is still much more
742 efficient to alloc 1 per page off the slab compared to 17K (5page)
743 alloc of large cifs buffers even when page debugging is on */
744 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
745 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
747 if (cifs_sm_req_cachep == NULL) {
748 mempool_destroy(cifs_req_poolp);
749 kmem_cache_destroy(cifs_req_cachep);
753 if(cifs_min_small < 2)
755 else if (cifs_min_small > 256) {
756 cifs_min_small = 256;
757 cFYI(1,("cifs_min_small set to maximum (256)"));
760 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
763 if(cifs_sm_req_poolp == NULL) {
764 mempool_destroy(cifs_req_poolp);
765 kmem_cache_destroy(cifs_req_cachep);
766 kmem_cache_destroy(cifs_sm_req_cachep);
774 cifs_destroy_request_bufs(void)
776 mempool_destroy(cifs_req_poolp);
777 kmem_cache_destroy(cifs_req_cachep);
778 mempool_destroy(cifs_sm_req_poolp);
779 kmem_cache_destroy(cifs_sm_req_cachep);
785 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
786 sizeof (struct mid_q_entry), 0,
787 SLAB_HWCACHE_ALIGN, NULL, NULL);
788 if (cifs_mid_cachep == NULL)
791 /* 3 is a reasonable minimum number of simultaneous operations */
792 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
793 if(cifs_mid_poolp == NULL) {
794 kmem_cache_destroy(cifs_mid_cachep);
798 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
799 sizeof (struct oplock_q_entry), 0,
800 SLAB_HWCACHE_ALIGN, NULL, NULL);
801 if (cifs_oplock_cachep == NULL) {
802 kmem_cache_destroy(cifs_mid_cachep);
803 mempool_destroy(cifs_mid_poolp);
811 cifs_destroy_mids(void)
813 mempool_destroy(cifs_mid_poolp);
814 kmem_cache_destroy(cifs_mid_cachep);
815 kmem_cache_destroy(cifs_oplock_cachep);
818 static int cifs_oplock_thread(void * dummyarg)
820 struct oplock_q_entry * oplock_item;
821 struct cifsTconInfo *pTcon;
822 struct inode * inode;
830 spin_lock(&GlobalMid_Lock);
831 if(list_empty(&GlobalOplock_Q)) {
832 spin_unlock(&GlobalMid_Lock);
833 set_current_state(TASK_INTERRUPTIBLE);
834 schedule_timeout(39*HZ);
836 oplock_item = list_entry(GlobalOplock_Q.next,
837 struct oplock_q_entry, qhead);
839 cFYI(1,("found oplock item to write out"));
840 pTcon = oplock_item->tcon;
841 inode = oplock_item->pinode;
842 netfid = oplock_item->netfid;
843 spin_unlock(&GlobalMid_Lock);
844 DeleteOplockQEntry(oplock_item);
845 /* can not grab inode sem here since it would
846 deadlock when oplock received on delete
847 since vfs_unlink holds the i_mutex across
849 /* mutex_lock(&inode->i_mutex);*/
850 if (S_ISREG(inode->i_mode)) {
851 rc = filemap_fdatawrite(inode->i_mapping);
852 if(CIFS_I(inode)->clientCanCacheRead == 0) {
853 filemap_fdatawait(inode->i_mapping);
854 invalidate_remote_inode(inode);
858 /* mutex_unlock(&inode->i_mutex);*/
860 CIFS_I(inode)->write_behind_rc = rc;
861 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
863 /* releasing a stale oplock after recent reconnection
864 of smb session using a now incorrect file
865 handle is not a data integrity issue but do
866 not bother sending an oplock release if session
867 to server still is disconnected since oplock
868 already released by the server in that case */
869 if(pTcon->tidStatus != CifsNeedReconnect) {
870 rc = CIFSSMBLock(0, pTcon, netfid,
871 0 /* len */ , 0 /* offset */, 0,
872 0, LOCKING_ANDX_OPLOCK_RELEASE,
874 cFYI(1,("Oplock release rc = %d ",rc));
877 spin_unlock(&GlobalMid_Lock);
878 set_current_state(TASK_INTERRUPTIBLE);
879 schedule_timeout(1); /* yield in case q were corrupt */
881 } while (!kthread_should_stop());
886 static int cifs_dnotify_thread(void * dummyarg)
888 struct list_head *tmp;
889 struct cifsSesInfo *ses;
894 set_current_state(TASK_INTERRUPTIBLE);
895 schedule_timeout(15*HZ);
896 read_lock(&GlobalSMBSeslock);
897 /* check if any stuck requests that need
898 to be woken up and wakeq so the
899 thread can wake up and error out */
900 list_for_each(tmp, &GlobalSMBSessionList) {
901 ses = list_entry(tmp, struct cifsSesInfo,
903 if(ses && ses->server &&
904 atomic_read(&ses->server->inFlight))
905 wake_up_all(&ses->server->response_q);
907 read_unlock(&GlobalSMBSeslock);
908 } while (!kthread_should_stop());
917 #ifdef CONFIG_PROC_FS
920 /* INIT_LIST_HEAD(&GlobalServerList);*/ /* BB not implemented yet */
921 INIT_LIST_HEAD(&GlobalSMBSessionList);
922 INIT_LIST_HEAD(&GlobalTreeConnectionList);
923 INIT_LIST_HEAD(&GlobalOplock_Q);
924 #ifdef CONFIG_CIFS_EXPERIMENTAL
925 INIT_LIST_HEAD(&GlobalDnotifyReqList);
926 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
929 * Initialize Global counters
931 atomic_set(&sesInfoAllocCount, 0);
932 atomic_set(&tconInfoAllocCount, 0);
933 atomic_set(&tcpSesAllocCount,0);
934 atomic_set(&tcpSesReconnectCount, 0);
935 atomic_set(&tconInfoReconnectCount, 0);
937 atomic_set(&bufAllocCount, 0);
938 atomic_set(&smBufAllocCount, 0);
939 #ifdef CONFIG_CIFS_STATS2
940 atomic_set(&totBufAllocCount, 0);
941 atomic_set(&totSmBufAllocCount, 0);
942 #endif /* CONFIG_CIFS_STATS2 */
944 atomic_set(&midCount, 0);
945 GlobalCurrentXid = 0;
946 GlobalTotalActiveXid = 0;
947 GlobalMaxActiveXid = 0;
948 memset(Local_System_Name, 0, 15);
949 rwlock_init(&GlobalSMBSeslock);
950 spin_lock_init(&GlobalMid_Lock);
952 if(cifs_max_pending < 2) {
953 cifs_max_pending = 2;
954 cFYI(1,("cifs_max_pending set to min of 2"));
955 } else if(cifs_max_pending > 256) {
956 cifs_max_pending = 256;
957 cFYI(1,("cifs_max_pending set to max of 256"));
960 rc = cifs_init_inodecache();
964 rc = cifs_init_mids();
966 goto out_destroy_inodecache;
968 rc = cifs_init_request_bufs();
970 goto out_destroy_mids;
972 rc = register_filesystem(&cifs_fs_type);
974 goto out_destroy_request_bufs;
976 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
977 if (IS_ERR(oplockThread)) {
978 rc = PTR_ERR(oplockThread);
979 cERROR(1,("error %d create oplock thread", rc));
980 goto out_unregister_filesystem;
983 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
984 if (IS_ERR(dnotifyThread)) {
985 rc = PTR_ERR(dnotifyThread);
986 cERROR(1,("error %d create dnotify thread", rc));
987 goto out_stop_oplock_thread;
992 out_stop_oplock_thread:
993 kthread_stop(oplockThread);
994 out_unregister_filesystem:
995 unregister_filesystem(&cifs_fs_type);
996 out_destroy_request_bufs:
997 cifs_destroy_request_bufs();
1000 out_destroy_inodecache:
1001 cifs_destroy_inodecache();
1003 #ifdef CONFIG_PROC_FS
1012 cFYI(0, ("In unregister ie exit_cifs"));
1013 #ifdef CONFIG_PROC_FS
1016 unregister_filesystem(&cifs_fs_type);
1017 cifs_destroy_inodecache();
1018 cifs_destroy_mids();
1019 cifs_destroy_request_bufs();
1020 kthread_stop(oplockThread);
1021 kthread_stop(dnotifyThread);
1024 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1025 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1027 ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1028 MODULE_VERSION(CIFS_VERSION);
1029 module_init(init_cifs)
1030 module_exit(exit_cifs)