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>
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 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
48 #ifdef CONFIG_CIFS_QUOTA
49 static struct quotactl_ops cifs_quotactl_ops;
55 unsigned int oplockEnabled = 1;
56 unsigned int experimEnabled = 0;
57 unsigned int linuxExtEnabled = 1;
58 unsigned int lookupCacheEnabled = 1;
59 unsigned int multiuser_mount = 0;
60 unsigned int extended_security = CIFSSEC_DEF;
61 /* unsigned int ntlmv2_support = 0; */
62 unsigned int sign_CIFS_PDUs = 1;
63 extern struct task_struct * oplockThread; /* remove sparse warning */
64 struct task_struct * oplockThread = NULL;
65 extern struct task_struct * dnotifyThread; /* remove sparse warning */
66 struct task_struct * dnotifyThread = NULL;
67 static struct super_operations cifs_super_ops;
68 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
69 module_param(CIFSMaxBufSize, int, 0);
70 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
71 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
72 module_param(cifs_min_rcv, int, 0);
73 MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
74 unsigned int cifs_min_small = 30;
75 module_param(cifs_min_small, int, 0);
76 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
77 unsigned int cifs_max_pending = CIFS_MAX_REQ;
78 module_param(cifs_max_pending, int, 0);
79 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
81 extern mempool_t *cifs_sm_req_poolp;
82 extern mempool_t *cifs_req_poolp;
83 extern mempool_t *cifs_mid_poolp;
85 extern struct kmem_cache *cifs_oplock_cachep;
88 cifs_read_super(struct super_block *sb, void *data,
89 const char *devname, int silent)
92 struct cifs_sb_info *cifs_sb;
95 sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
96 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
97 cifs_sb = CIFS_SB(sb);
101 rc = cifs_mount(sb, cifs_sb, data, devname);
106 ("cifs_mount failed w/return code = %d", rc));
107 goto out_mount_failed;
110 sb->s_magic = CIFS_MAGIC_NUMBER;
111 sb->s_op = &cifs_super_ops;
112 /* if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
113 sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
114 #ifdef CONFIG_CIFS_QUOTA
115 sb->s_qcop = &cifs_quotactl_ops;
117 sb->s_blocksize = CIFS_MAX_MSGSIZE;
118 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
119 inode = iget(sb, ROOT_I);
126 sb->s_root = d_alloc_root(inode);
136 cERROR(1, ("cifs_read_super: get root inode failed"));
142 if(cifs_sb->local_nls)
143 unload_nls(cifs_sb->local_nls);
150 cifs_put_super(struct super_block *sb)
153 struct cifs_sb_info *cifs_sb;
155 cFYI(1, ("In cifs_put_super"));
156 cifs_sb = CIFS_SB(sb);
157 if(cifs_sb == NULL) {
158 cFYI(1,("Empty cifs superblock info passed to unmount"));
161 rc = cifs_umount(sb, cifs_sb);
163 cERROR(1, ("cifs_umount failed with return code %d", rc));
165 unload_nls(cifs_sb->local_nls);
171 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
173 struct super_block *sb = dentry->d_sb;
175 int rc = -EOPNOTSUPP;
176 struct cifs_sb_info *cifs_sb;
177 struct cifsTconInfo *pTcon;
181 cifs_sb = CIFS_SB(sb);
182 pTcon = cifs_sb->tcon;
184 buf->f_type = CIFS_MAGIC_NUMBER;
186 /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
187 buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
188 presumably be total path, but note
189 that some servers (includinng Samba 3)
190 have a shorter maximum path */
191 buf->f_files = 0; /* undefined */
192 buf->f_ffree = 0; /* unlimited */
194 /* BB we could add a second check for a QFS Unix capability bit */
195 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
196 if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
197 le64_to_cpu(pTcon->fsUnixInfo.Capability)))
198 rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
200 /* Only need to call the old QFSInfo if failed
203 if(pTcon->ses->capabilities & CAP_NT_SMBS)
204 rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* not supported by OS2 */
206 /* Some old Windows servers also do not support level 103, retry with
207 older level one if old server failed the previous call or we
208 bypassed it because we detected that this was an older LANMAN sess */
210 rc = SMBOldQFSInfo(xid, pTcon, buf);
215 /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
217 return 0; /* always return success? what if volume is no
221 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
223 struct cifs_sb_info *cifs_sb;
225 cifs_sb = CIFS_SB(inode->i_sb);
227 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
229 } else /* file mode might have been restricted at mount time
230 on the client (above and beyond ACL on servers) for
231 servers which do not support setting and viewing mode bits,
232 so allowing client to check permissions is useful */
233 return generic_permission(inode, mask, NULL);
236 static struct kmem_cache *cifs_inode_cachep;
237 static struct kmem_cache *cifs_req_cachep;
238 static struct kmem_cache *cifs_mid_cachep;
239 struct kmem_cache *cifs_oplock_cachep;
240 static struct kmem_cache *cifs_sm_req_cachep;
241 mempool_t *cifs_sm_req_poolp;
242 mempool_t *cifs_req_poolp;
243 mempool_t *cifs_mid_poolp;
245 static struct inode *
246 cifs_alloc_inode(struct super_block *sb)
248 struct cifsInodeInfo *cifs_inode;
249 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
252 cifs_inode->cifsAttrs = 0x20; /* default */
253 atomic_set(&cifs_inode->inUse, 0);
254 cifs_inode->time = 0;
255 /* Until the file is open and we have gotten oplock
256 info back from the server, can not assume caching of
257 file data or metadata */
258 cifs_inode->clientCanCacheRead = FALSE;
259 cifs_inode->clientCanCacheAll = FALSE;
260 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
261 cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
262 INIT_LIST_HEAD(&cifs_inode->openFileList);
263 return &cifs_inode->vfs_inode;
267 cifs_destroy_inode(struct inode *inode)
269 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
273 * cifs_show_options() is for displaying mount options in /proc/mounts.
274 * Not all settable options are displayed but most of the important
278 cifs_show_options(struct seq_file *s, struct vfsmount *m)
280 struct cifs_sb_info *cifs_sb;
282 cifs_sb = CIFS_SB(m->mnt_sb);
286 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
287 if (cifs_sb->tcon->ses) {
288 if (cifs_sb->tcon->ses->userName)
289 seq_printf(s, ",username=%s",
290 cifs_sb->tcon->ses->userName);
291 if(cifs_sb->tcon->ses->domainName)
292 seq_printf(s, ",domain=%s",
293 cifs_sb->tcon->ses->domainName);
296 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
297 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
302 #ifdef CONFIG_CIFS_QUOTA
303 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
304 struct fs_disk_quota * pdquota)
308 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
309 struct cifsTconInfo *pTcon;
312 pTcon = cifs_sb->tcon;
319 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
328 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
329 struct fs_disk_quota * pdquota)
333 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
334 struct cifsTconInfo *pTcon;
337 pTcon = cifs_sb->tcon;
343 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
352 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
356 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
357 struct cifsTconInfo *pTcon;
360 pTcon = cifs_sb->tcon;
366 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
375 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
379 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
380 struct cifsTconInfo *pTcon;
383 pTcon = cifs_sb->tcon;
389 cFYI(1,("pqstats %p",qstats));
398 static struct quotactl_ops cifs_quotactl_ops = {
399 .set_xquota = cifs_xquota_set,
400 .get_xquota = cifs_xquota_set,
401 .set_xstate = cifs_xstate_set,
402 .get_xstate = cifs_xstate_get,
406 static void cifs_umount_begin(struct vfsmount * vfsmnt, int flags)
408 struct cifs_sb_info *cifs_sb;
409 struct cifsTconInfo * tcon;
411 if (!(flags & MNT_FORCE))
413 cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
417 tcon = cifs_sb->tcon;
420 down(&tcon->tconSem);
421 if (atomic_read(&tcon->useCount) == 1)
422 tcon->tidStatus = CifsExiting;
425 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
426 /* cancel_notify_requests(tcon); */
427 if(tcon->ses && tcon->ses->server)
429 cFYI(1,("wake up tasks now - umount begin not complete"));
430 wake_up_all(&tcon->ses->server->request_q);
431 wake_up_all(&tcon->ses->server->response_q);
432 msleep(1); /* yield */
433 /* we have to kick the requests once more */
434 wake_up_all(&tcon->ses->server->response_q);
437 /* BB FIXME - finish add checks for tidStatus BB */
442 #ifdef CONFIG_CIFS_STATS2
443 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
450 static int cifs_remount(struct super_block *sb, int *flags, char *data)
452 *flags |= MS_NODIRATIME;
456 static struct super_operations cifs_super_ops = {
457 .read_inode = cifs_read_inode,
458 .put_super = cifs_put_super,
459 .statfs = cifs_statfs,
460 .alloc_inode = cifs_alloc_inode,
461 .destroy_inode = cifs_destroy_inode,
462 /* .drop_inode = generic_delete_inode,
463 .delete_inode = cifs_delete_inode, *//* Do not need the above two functions
464 unless later we add lazy close of inodes or unless the kernel forgets to call
465 us with the same number of releases (closes) as opens */
466 .show_options = cifs_show_options,
467 .umount_begin = cifs_umount_begin,
468 .remount_fs = cifs_remount,
469 #ifdef CONFIG_CIFS_STATS2
470 .show_stats = cifs_show_stats,
475 cifs_get_sb(struct file_system_type *fs_type,
476 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
479 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
481 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
488 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
490 up_write(&sb->s_umount);
491 deactivate_super(sb);
494 sb->s_flags |= MS_ACTIVE;
495 return simple_set_mnt(mnt, sb);
498 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
499 unsigned long nr_segs, loff_t pos)
501 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
504 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
505 if (!CIFS_I(inode)->clientCanCacheAll)
506 filemap_fdatawrite(inode->i_mapping);
510 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
512 /* origin == SEEK_END => we must revalidate the cached file length */
513 if (origin == SEEK_END) {
514 int retval = cifs_revalidate(file->f_path.dentry);
516 return (loff_t)retval;
518 return remote_llseek(file, offset, origin);
521 static struct file_system_type cifs_fs_type = {
522 .owner = THIS_MODULE,
524 .get_sb = cifs_get_sb,
525 .kill_sb = kill_anon_super,
528 struct inode_operations cifs_dir_inode_ops = {
529 .create = cifs_create,
530 .lookup = cifs_lookup,
531 .getattr = cifs_getattr,
532 .unlink = cifs_unlink,
533 .link = cifs_hardlink,
536 .rename = cifs_rename,
537 .permission = cifs_permission,
538 /* revalidate:cifs_revalidate, */
539 .setattr = cifs_setattr,
540 .symlink = cifs_symlink,
542 #ifdef CONFIG_CIFS_XATTR
543 .setxattr = cifs_setxattr,
544 .getxattr = cifs_getxattr,
545 .listxattr = cifs_listxattr,
546 .removexattr = cifs_removexattr,
550 struct inode_operations cifs_file_inode_ops = {
551 /* revalidate:cifs_revalidate, */
552 .setattr = cifs_setattr,
553 .getattr = cifs_getattr, /* do we need this anymore? */
554 .rename = cifs_rename,
555 .permission = cifs_permission,
556 #ifdef CONFIG_CIFS_XATTR
557 .setxattr = cifs_setxattr,
558 .getxattr = cifs_getxattr,
559 .listxattr = cifs_listxattr,
560 .removexattr = cifs_removexattr,
564 struct inode_operations cifs_symlink_inode_ops = {
565 .readlink = generic_readlink,
566 .follow_link = cifs_follow_link,
567 .put_link = cifs_put_link,
568 .permission = cifs_permission,
569 /* BB add the following two eventually */
570 /* revalidate: cifs_revalidate,
571 setattr: cifs_notify_change, *//* BB do we need notify change */
572 #ifdef CONFIG_CIFS_XATTR
573 .setxattr = cifs_setxattr,
574 .getxattr = cifs_getxattr,
575 .listxattr = cifs_listxattr,
576 .removexattr = cifs_removexattr,
580 const struct file_operations cifs_file_ops = {
581 .read = do_sync_read,
582 .write = do_sync_write,
583 .aio_read = generic_file_aio_read,
584 .aio_write = cifs_file_aio_write,
586 .release = cifs_close,
590 .mmap = cifs_file_mmap,
591 .sendfile = generic_file_sendfile,
592 .llseek = cifs_llseek,
593 #ifdef CONFIG_CIFS_POSIX
595 #endif /* CONFIG_CIFS_POSIX */
597 #ifdef CONFIG_CIFS_EXPERIMENTAL
598 .dir_notify = cifs_dir_notify,
599 #endif /* CONFIG_CIFS_EXPERIMENTAL */
602 const struct file_operations cifs_file_direct_ops = {
603 /* no mmap, no aio, no readv -
604 BB reevaluate whether they can be done with directio, no cache */
605 .read = cifs_user_read,
606 .write = cifs_user_write,
608 .release = cifs_close,
612 .sendfile = generic_file_sendfile, /* BB removeme BB */
613 #ifdef CONFIG_CIFS_POSIX
615 #endif /* CONFIG_CIFS_POSIX */
616 .llseek = cifs_llseek,
617 #ifdef CONFIG_CIFS_EXPERIMENTAL
618 .dir_notify = cifs_dir_notify,
619 #endif /* CONFIG_CIFS_EXPERIMENTAL */
621 const struct file_operations cifs_file_nobrl_ops = {
622 .read = do_sync_read,
623 .write = do_sync_write,
624 .aio_read = generic_file_aio_read,
625 .aio_write = cifs_file_aio_write,
627 .release = cifs_close,
630 .mmap = cifs_file_mmap,
631 .sendfile = generic_file_sendfile,
632 .llseek = cifs_llseek,
633 #ifdef CONFIG_CIFS_POSIX
635 #endif /* CONFIG_CIFS_POSIX */
637 #ifdef CONFIG_CIFS_EXPERIMENTAL
638 .dir_notify = cifs_dir_notify,
639 #endif /* CONFIG_CIFS_EXPERIMENTAL */
642 const struct file_operations cifs_file_direct_nobrl_ops = {
643 /* no mmap, no aio, no readv -
644 BB reevaluate whether they can be done with directio, no cache */
645 .read = cifs_user_read,
646 .write = cifs_user_write,
648 .release = cifs_close,
651 .sendfile = generic_file_sendfile, /* BB removeme BB */
652 #ifdef CONFIG_CIFS_POSIX
654 #endif /* CONFIG_CIFS_POSIX */
655 .llseek = cifs_llseek,
656 #ifdef CONFIG_CIFS_EXPERIMENTAL
657 .dir_notify = cifs_dir_notify,
658 #endif /* CONFIG_CIFS_EXPERIMENTAL */
661 const struct file_operations cifs_dir_ops = {
662 .readdir = cifs_readdir,
663 .release = cifs_closedir,
664 .read = generic_read_dir,
665 #ifdef CONFIG_CIFS_EXPERIMENTAL
666 .dir_notify = cifs_dir_notify,
667 #endif /* CONFIG_CIFS_EXPERIMENTAL */
672 cifs_init_once(void *inode, struct kmem_cache * cachep, unsigned long flags)
674 struct cifsInodeInfo *cifsi = inode;
676 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
677 SLAB_CTOR_CONSTRUCTOR) {
678 inode_init_once(&cifsi->vfs_inode);
679 INIT_LIST_HEAD(&cifsi->lockList);
684 cifs_init_inodecache(void)
686 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
687 sizeof (struct cifsInodeInfo),
688 0, (SLAB_RECLAIM_ACCOUNT|
690 cifs_init_once, NULL);
691 if (cifs_inode_cachep == NULL)
698 cifs_destroy_inodecache(void)
700 kmem_cache_destroy(cifs_inode_cachep);
704 cifs_init_request_bufs(void)
706 if(CIFSMaxBufSize < 8192) {
707 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
708 Unicode path name has to fit in any SMB/CIFS path based frames */
709 CIFSMaxBufSize = 8192;
710 } else if (CIFSMaxBufSize > 1024*127) {
711 CIFSMaxBufSize = 1024 * 127;
713 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
715 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
716 cifs_req_cachep = kmem_cache_create("cifs_request",
718 MAX_CIFS_HDR_SIZE, 0,
719 SLAB_HWCACHE_ALIGN, NULL, NULL);
720 if (cifs_req_cachep == NULL)
725 else if (cifs_min_rcv > 64) {
727 cERROR(1,("cifs_min_rcv set to maximum (64)"));
730 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
733 if(cifs_req_poolp == NULL) {
734 kmem_cache_destroy(cifs_req_cachep);
737 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
738 almost all handle based requests (but not write response, nor is it
739 sufficient for path based requests). A smaller size would have
740 been more efficient (compacting multiple slab items on one 4k page)
741 for the case in which debug was on, but this larger size allows
742 more SMBs to use small buffer alloc and is still much more
743 efficient to alloc 1 per page off the slab compared to 17K (5page)
744 alloc of large cifs buffers even when page debugging is on */
745 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
746 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
748 if (cifs_sm_req_cachep == NULL) {
749 mempool_destroy(cifs_req_poolp);
750 kmem_cache_destroy(cifs_req_cachep);
754 if(cifs_min_small < 2)
756 else if (cifs_min_small > 256) {
757 cifs_min_small = 256;
758 cFYI(1,("cifs_min_small set to maximum (256)"));
761 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
764 if(cifs_sm_req_poolp == NULL) {
765 mempool_destroy(cifs_req_poolp);
766 kmem_cache_destroy(cifs_req_cachep);
767 kmem_cache_destroy(cifs_sm_req_cachep);
775 cifs_destroy_request_bufs(void)
777 mempool_destroy(cifs_req_poolp);
778 kmem_cache_destroy(cifs_req_cachep);
779 mempool_destroy(cifs_sm_req_poolp);
780 kmem_cache_destroy(cifs_sm_req_cachep);
786 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
787 sizeof (struct mid_q_entry), 0,
788 SLAB_HWCACHE_ALIGN, NULL, NULL);
789 if (cifs_mid_cachep == NULL)
792 /* 3 is a reasonable minimum number of simultaneous operations */
793 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
794 if(cifs_mid_poolp == NULL) {
795 kmem_cache_destroy(cifs_mid_cachep);
799 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
800 sizeof (struct oplock_q_entry), 0,
801 SLAB_HWCACHE_ALIGN, NULL, NULL);
802 if (cifs_oplock_cachep == NULL) {
803 kmem_cache_destroy(cifs_mid_cachep);
804 mempool_destroy(cifs_mid_poolp);
812 cifs_destroy_mids(void)
814 mempool_destroy(cifs_mid_poolp);
815 kmem_cache_destroy(cifs_mid_cachep);
816 kmem_cache_destroy(cifs_oplock_cachep);
819 static int cifs_oplock_thread(void * dummyarg)
821 struct oplock_q_entry * oplock_item;
822 struct cifsTconInfo *pTcon;
823 struct inode * inode;
831 spin_lock(&GlobalMid_Lock);
832 if(list_empty(&GlobalOplock_Q)) {
833 spin_unlock(&GlobalMid_Lock);
834 set_current_state(TASK_INTERRUPTIBLE);
835 schedule_timeout(39*HZ);
837 oplock_item = list_entry(GlobalOplock_Q.next,
838 struct oplock_q_entry, qhead);
840 cFYI(1,("found oplock item to write out"));
841 pTcon = oplock_item->tcon;
842 inode = oplock_item->pinode;
843 netfid = oplock_item->netfid;
844 spin_unlock(&GlobalMid_Lock);
845 DeleteOplockQEntry(oplock_item);
846 /* can not grab inode sem here since it would
847 deadlock when oplock received on delete
848 since vfs_unlink holds the i_mutex across
850 /* mutex_lock(&inode->i_mutex);*/
851 if (S_ISREG(inode->i_mode)) {
852 rc = filemap_fdatawrite(inode->i_mapping);
853 if(CIFS_I(inode)->clientCanCacheRead == 0) {
854 filemap_fdatawait(inode->i_mapping);
855 invalidate_remote_inode(inode);
859 /* mutex_unlock(&inode->i_mutex);*/
861 CIFS_I(inode)->write_behind_rc = rc;
862 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
864 /* releasing a stale oplock after recent reconnection
865 of smb session using a now incorrect file
866 handle is not a data integrity issue but do
867 not bother sending an oplock release if session
868 to server still is disconnected since oplock
869 already released by the server in that case */
870 if(pTcon->tidStatus != CifsNeedReconnect) {
871 rc = CIFSSMBLock(0, pTcon, netfid,
872 0 /* len */ , 0 /* offset */, 0,
873 0, LOCKING_ANDX_OPLOCK_RELEASE,
875 cFYI(1,("Oplock release rc = %d ",rc));
878 spin_unlock(&GlobalMid_Lock);
879 set_current_state(TASK_INTERRUPTIBLE);
880 schedule_timeout(1); /* yield in case q were corrupt */
882 } while (!kthread_should_stop());
887 static int cifs_dnotify_thread(void * dummyarg)
889 struct list_head *tmp;
890 struct cifsSesInfo *ses;
895 set_current_state(TASK_INTERRUPTIBLE);
896 schedule_timeout(15*HZ);
897 read_lock(&GlobalSMBSeslock);
898 /* check if any stuck requests that need
899 to be woken up and wakeq so the
900 thread can wake up and error out */
901 list_for_each(tmp, &GlobalSMBSessionList) {
902 ses = list_entry(tmp, struct cifsSesInfo,
904 if(ses && ses->server &&
905 atomic_read(&ses->server->inFlight))
906 wake_up_all(&ses->server->response_q);
908 read_unlock(&GlobalSMBSeslock);
909 } while (!kthread_should_stop());
918 #ifdef CONFIG_PROC_FS
921 /* INIT_LIST_HEAD(&GlobalServerList);*/ /* BB not implemented yet */
922 INIT_LIST_HEAD(&GlobalSMBSessionList);
923 INIT_LIST_HEAD(&GlobalTreeConnectionList);
924 INIT_LIST_HEAD(&GlobalOplock_Q);
925 #ifdef CONFIG_CIFS_EXPERIMENTAL
926 INIT_LIST_HEAD(&GlobalDnotifyReqList);
927 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
930 * Initialize Global counters
932 atomic_set(&sesInfoAllocCount, 0);
933 atomic_set(&tconInfoAllocCount, 0);
934 atomic_set(&tcpSesAllocCount,0);
935 atomic_set(&tcpSesReconnectCount, 0);
936 atomic_set(&tconInfoReconnectCount, 0);
938 atomic_set(&bufAllocCount, 0);
939 atomic_set(&smBufAllocCount, 0);
940 #ifdef CONFIG_CIFS_STATS2
941 atomic_set(&totBufAllocCount, 0);
942 atomic_set(&totSmBufAllocCount, 0);
943 #endif /* CONFIG_CIFS_STATS2 */
945 atomic_set(&midCount, 0);
946 GlobalCurrentXid = 0;
947 GlobalTotalActiveXid = 0;
948 GlobalMaxActiveXid = 0;
949 memset(Local_System_Name, 0, 15);
950 rwlock_init(&GlobalSMBSeslock);
951 spin_lock_init(&GlobalMid_Lock);
953 if(cifs_max_pending < 2) {
954 cifs_max_pending = 2;
955 cFYI(1,("cifs_max_pending set to min of 2"));
956 } else if(cifs_max_pending > 256) {
957 cifs_max_pending = 256;
958 cFYI(1,("cifs_max_pending set to max of 256"));
961 rc = cifs_init_inodecache();
965 rc = cifs_init_mids();
967 goto out_destroy_inodecache;
969 rc = cifs_init_request_bufs();
971 goto out_destroy_mids;
973 rc = register_filesystem(&cifs_fs_type);
975 goto out_destroy_request_bufs;
977 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
978 if (IS_ERR(oplockThread)) {
979 rc = PTR_ERR(oplockThread);
980 cERROR(1,("error %d create oplock thread", rc));
981 goto out_unregister_filesystem;
984 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
985 if (IS_ERR(dnotifyThread)) {
986 rc = PTR_ERR(dnotifyThread);
987 cERROR(1,("error %d create dnotify thread", rc));
988 goto out_stop_oplock_thread;
993 out_stop_oplock_thread:
994 kthread_stop(oplockThread);
995 out_unregister_filesystem:
996 unregister_filesystem(&cifs_fs_type);
997 out_destroy_request_bufs:
998 cifs_destroy_request_bufs();
1000 cifs_destroy_mids();
1001 out_destroy_inodecache:
1002 cifs_destroy_inodecache();
1004 #ifdef CONFIG_PROC_FS
1013 cFYI(0, ("In unregister ie exit_cifs"));
1014 #ifdef CONFIG_PROC_FS
1017 unregister_filesystem(&cifs_fs_type);
1018 cifs_destroy_inodecache();
1019 cifs_destroy_mids();
1020 cifs_destroy_request_bufs();
1021 kthread_stop(oplockThread);
1022 kthread_stop(dnotifyThread);
1025 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1026 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1028 ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1029 MODULE_VERSION(CIFS_VERSION);
1030 module_init(init_cifs)
1031 module_exit(exit_cifs)