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 const 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 /* BB should we make this contingent on mount parm? */
96 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
97 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
98 cifs_sb = CIFS_SB(sb);
102 rc = cifs_mount(sb, cifs_sb, data, devname);
107 ("cifs_mount failed w/return code = %d", rc));
108 goto out_mount_failed;
111 sb->s_magic = CIFS_MAGIC_NUMBER;
112 sb->s_op = &cifs_super_ops;
113 /* if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
114 sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
115 #ifdef CONFIG_CIFS_QUOTA
116 sb->s_qcop = &cifs_quotactl_ops;
118 sb->s_blocksize = CIFS_MAX_MSGSIZE;
119 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
120 inode = iget(sb, ROOT_I);
127 sb->s_root = d_alloc_root(inode);
137 cERROR(1, ("cifs_read_super: get root inode failed"));
143 if(cifs_sb->local_nls)
144 unload_nls(cifs_sb->local_nls);
151 cifs_put_super(struct super_block *sb)
154 struct cifs_sb_info *cifs_sb;
156 cFYI(1, ("In cifs_put_super"));
157 cifs_sb = CIFS_SB(sb);
158 if(cifs_sb == NULL) {
159 cFYI(1,("Empty cifs superblock info passed to unmount"));
162 rc = cifs_umount(sb, cifs_sb);
164 cERROR(1, ("cifs_umount failed with return code %d", rc));
166 unload_nls(cifs_sb->local_nls);
172 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
174 struct super_block *sb = dentry->d_sb;
176 int rc = -EOPNOTSUPP;
177 struct cifs_sb_info *cifs_sb;
178 struct cifsTconInfo *pTcon;
182 cifs_sb = CIFS_SB(sb);
183 pTcon = cifs_sb->tcon;
185 buf->f_type = CIFS_MAGIC_NUMBER;
187 /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
188 buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
189 presumably be total path, but note
190 that some servers (includinng Samba 3)
191 have a shorter maximum path */
192 buf->f_files = 0; /* undefined */
193 buf->f_ffree = 0; /* unlimited */
195 /* BB we could add a second check for a QFS Unix capability bit */
196 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
197 if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
198 le64_to_cpu(pTcon->fsUnixInfo.Capability)))
199 rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
201 /* Only need to call the old QFSInfo if failed
204 if(pTcon->ses->capabilities & CAP_NT_SMBS)
205 rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* not supported by OS2 */
207 /* Some old Windows servers also do not support level 103, retry with
208 older level one if old server failed the previous call or we
209 bypassed it because we detected that this was an older LANMAN sess */
211 rc = SMBOldQFSInfo(xid, pTcon, buf);
216 /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
218 return 0; /* always return success? what if volume is no
222 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
224 struct cifs_sb_info *cifs_sb;
226 cifs_sb = CIFS_SB(inode->i_sb);
228 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
230 } else /* file mode might have been restricted at mount time
231 on the client (above and beyond ACL on servers) for
232 servers which do not support setting and viewing mode bits,
233 so allowing client to check permissions is useful */
234 return generic_permission(inode, mask, NULL);
237 static struct kmem_cache *cifs_inode_cachep;
238 static struct kmem_cache *cifs_req_cachep;
239 static struct kmem_cache *cifs_mid_cachep;
240 struct kmem_cache *cifs_oplock_cachep;
241 static struct kmem_cache *cifs_sm_req_cachep;
242 mempool_t *cifs_sm_req_poolp;
243 mempool_t *cifs_req_poolp;
244 mempool_t *cifs_mid_poolp;
246 static struct inode *
247 cifs_alloc_inode(struct super_block *sb)
249 struct cifsInodeInfo *cifs_inode;
250 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
253 cifs_inode->cifsAttrs = 0x20; /* default */
254 atomic_set(&cifs_inode->inUse, 0);
255 cifs_inode->time = 0;
256 /* Until the file is open and we have gotten oplock
257 info back from the server, can not assume caching of
258 file data or metadata */
259 cifs_inode->clientCanCacheRead = FALSE;
260 cifs_inode->clientCanCacheAll = FALSE;
261 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
263 /* Can not set i_flags here - they get immediately overwritten
264 to zero by the VFS */
265 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
266 INIT_LIST_HEAD(&cifs_inode->openFileList);
267 return &cifs_inode->vfs_inode;
271 cifs_destroy_inode(struct inode *inode)
273 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
277 * cifs_show_options() is for displaying mount options in /proc/mounts.
278 * Not all settable options are displayed but most of the important
282 cifs_show_options(struct seq_file *s, struct vfsmount *m)
284 struct cifs_sb_info *cifs_sb;
286 cifs_sb = CIFS_SB(m->mnt_sb);
290 /* BB add prepath to mount options displayed */
291 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
292 if (cifs_sb->tcon->ses) {
293 if (cifs_sb->tcon->ses->userName)
294 seq_printf(s, ",username=%s",
295 cifs_sb->tcon->ses->userName);
296 if(cifs_sb->tcon->ses->domainName)
297 seq_printf(s, ",domain=%s",
298 cifs_sb->tcon->ses->domainName);
301 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
302 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
307 #ifdef CONFIG_CIFS_QUOTA
308 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
309 struct fs_disk_quota * pdquota)
313 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
314 struct cifsTconInfo *pTcon;
317 pTcon = cifs_sb->tcon;
324 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
333 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
334 struct fs_disk_quota * pdquota)
338 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
339 struct cifsTconInfo *pTcon;
342 pTcon = cifs_sb->tcon;
348 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
357 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
361 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
362 struct cifsTconInfo *pTcon;
365 pTcon = cifs_sb->tcon;
371 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
380 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
384 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
385 struct cifsTconInfo *pTcon;
388 pTcon = cifs_sb->tcon;
394 cFYI(1,("pqstats %p",qstats));
403 static struct quotactl_ops cifs_quotactl_ops = {
404 .set_xquota = cifs_xquota_set,
405 .get_xquota = cifs_xquota_set,
406 .set_xstate = cifs_xstate_set,
407 .get_xstate = cifs_xstate_get,
411 static void cifs_umount_begin(struct vfsmount * vfsmnt, int flags)
413 struct cifs_sb_info *cifs_sb;
414 struct cifsTconInfo * tcon;
416 if (!(flags & MNT_FORCE))
418 cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
422 tcon = cifs_sb->tcon;
425 down(&tcon->tconSem);
426 if (atomic_read(&tcon->useCount) == 1)
427 tcon->tidStatus = CifsExiting;
430 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
431 /* cancel_notify_requests(tcon); */
432 if(tcon->ses && tcon->ses->server)
434 cFYI(1,("wake up tasks now - umount begin not complete"));
435 wake_up_all(&tcon->ses->server->request_q);
436 wake_up_all(&tcon->ses->server->response_q);
437 msleep(1); /* yield */
438 /* we have to kick the requests once more */
439 wake_up_all(&tcon->ses->server->response_q);
442 /* BB FIXME - finish add checks for tidStatus BB */
447 #ifdef CONFIG_CIFS_STATS2
448 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
455 static int cifs_remount(struct super_block *sb, int *flags, char *data)
457 *flags |= MS_NODIRATIME;
461 static const struct super_operations cifs_super_ops = {
462 .read_inode = cifs_read_inode,
463 .put_super = cifs_put_super,
464 .statfs = cifs_statfs,
465 .alloc_inode = cifs_alloc_inode,
466 .destroy_inode = cifs_destroy_inode,
467 /* .drop_inode = generic_delete_inode,
468 .delete_inode = cifs_delete_inode, *//* Do not need the above two functions
469 unless later we add lazy close of inodes or unless the kernel forgets to call
470 us with the same number of releases (closes) as opens */
471 .show_options = cifs_show_options,
472 .umount_begin = cifs_umount_begin,
473 .remount_fs = cifs_remount,
474 #ifdef CONFIG_CIFS_STATS2
475 .show_stats = cifs_show_stats,
480 cifs_get_sb(struct file_system_type *fs_type,
481 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
484 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
486 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
493 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
495 up_write(&sb->s_umount);
496 deactivate_super(sb);
499 sb->s_flags |= MS_ACTIVE;
500 return simple_set_mnt(mnt, sb);
503 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
504 unsigned long nr_segs, loff_t pos)
506 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
509 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
510 if (!CIFS_I(inode)->clientCanCacheAll)
511 filemap_fdatawrite(inode->i_mapping);
515 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
517 /* origin == SEEK_END => we must revalidate the cached file length */
518 if (origin == SEEK_END) {
521 /* some applications poll for the file length in this strange
522 way so we must seek to end on non-oplocked files by
523 setting the revalidate time to zero */
524 if(file->f_path.dentry->d_inode)
525 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
527 retval = cifs_revalidate(file->f_path.dentry);
529 return (loff_t)retval;
531 return remote_llseek(file, offset, origin);
534 static struct file_system_type cifs_fs_type = {
535 .owner = THIS_MODULE,
537 .get_sb = cifs_get_sb,
538 .kill_sb = kill_anon_super,
541 const struct inode_operations cifs_dir_inode_ops = {
542 .create = cifs_create,
543 .lookup = cifs_lookup,
544 .getattr = cifs_getattr,
545 .unlink = cifs_unlink,
546 .link = cifs_hardlink,
549 .rename = cifs_rename,
550 .permission = cifs_permission,
551 /* revalidate:cifs_revalidate, */
552 .setattr = cifs_setattr,
553 .symlink = cifs_symlink,
555 #ifdef CONFIG_CIFS_XATTR
556 .setxattr = cifs_setxattr,
557 .getxattr = cifs_getxattr,
558 .listxattr = cifs_listxattr,
559 .removexattr = cifs_removexattr,
563 const struct inode_operations cifs_file_inode_ops = {
564 /* revalidate:cifs_revalidate, */
565 .setattr = cifs_setattr,
566 .getattr = cifs_getattr, /* do we need this anymore? */
567 .rename = cifs_rename,
568 .permission = cifs_permission,
569 #ifdef CONFIG_CIFS_XATTR
570 .setxattr = cifs_setxattr,
571 .getxattr = cifs_getxattr,
572 .listxattr = cifs_listxattr,
573 .removexattr = cifs_removexattr,
577 const struct inode_operations cifs_symlink_inode_ops = {
578 .readlink = generic_readlink,
579 .follow_link = cifs_follow_link,
580 .put_link = cifs_put_link,
581 .permission = cifs_permission,
582 /* BB add the following two eventually */
583 /* revalidate: cifs_revalidate,
584 setattr: cifs_notify_change, *//* BB do we need notify change */
585 #ifdef CONFIG_CIFS_XATTR
586 .setxattr = cifs_setxattr,
587 .getxattr = cifs_getxattr,
588 .listxattr = cifs_listxattr,
589 .removexattr = cifs_removexattr,
593 const struct file_operations cifs_file_ops = {
594 .read = do_sync_read,
595 .write = do_sync_write,
596 .aio_read = generic_file_aio_read,
597 .aio_write = cifs_file_aio_write,
599 .release = cifs_close,
603 .mmap = cifs_file_mmap,
604 .sendfile = generic_file_sendfile,
605 .llseek = cifs_llseek,
606 #ifdef CONFIG_CIFS_POSIX
608 #endif /* CONFIG_CIFS_POSIX */
610 #ifdef CONFIG_CIFS_EXPERIMENTAL
611 .dir_notify = cifs_dir_notify,
612 #endif /* CONFIG_CIFS_EXPERIMENTAL */
615 const struct file_operations cifs_file_direct_ops = {
616 /* no mmap, no aio, no readv -
617 BB reevaluate whether they can be done with directio, no cache */
618 .read = cifs_user_read,
619 .write = cifs_user_write,
621 .release = cifs_close,
625 .sendfile = generic_file_sendfile, /* BB removeme BB */
626 #ifdef CONFIG_CIFS_POSIX
628 #endif /* CONFIG_CIFS_POSIX */
629 .llseek = cifs_llseek,
630 #ifdef CONFIG_CIFS_EXPERIMENTAL
631 .dir_notify = cifs_dir_notify,
632 #endif /* CONFIG_CIFS_EXPERIMENTAL */
634 const struct file_operations cifs_file_nobrl_ops = {
635 .read = do_sync_read,
636 .write = do_sync_write,
637 .aio_read = generic_file_aio_read,
638 .aio_write = cifs_file_aio_write,
640 .release = cifs_close,
643 .mmap = cifs_file_mmap,
644 .sendfile = generic_file_sendfile,
645 .llseek = cifs_llseek,
646 #ifdef CONFIG_CIFS_POSIX
648 #endif /* CONFIG_CIFS_POSIX */
650 #ifdef CONFIG_CIFS_EXPERIMENTAL
651 .dir_notify = cifs_dir_notify,
652 #endif /* CONFIG_CIFS_EXPERIMENTAL */
655 const struct file_operations cifs_file_direct_nobrl_ops = {
656 /* no mmap, no aio, no readv -
657 BB reevaluate whether they can be done with directio, no cache */
658 .read = cifs_user_read,
659 .write = cifs_user_write,
661 .release = cifs_close,
664 .sendfile = generic_file_sendfile, /* BB removeme BB */
665 #ifdef CONFIG_CIFS_POSIX
667 #endif /* CONFIG_CIFS_POSIX */
668 .llseek = cifs_llseek,
669 #ifdef CONFIG_CIFS_EXPERIMENTAL
670 .dir_notify = cifs_dir_notify,
671 #endif /* CONFIG_CIFS_EXPERIMENTAL */
674 const struct file_operations cifs_dir_ops = {
675 .readdir = cifs_readdir,
676 .release = cifs_closedir,
677 .read = generic_read_dir,
678 #ifdef CONFIG_CIFS_EXPERIMENTAL
679 .dir_notify = cifs_dir_notify,
680 #endif /* CONFIG_CIFS_EXPERIMENTAL */
685 cifs_init_once(void *inode, struct kmem_cache * cachep, unsigned long flags)
687 struct cifsInodeInfo *cifsi = inode;
689 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
690 SLAB_CTOR_CONSTRUCTOR) {
691 inode_init_once(&cifsi->vfs_inode);
692 INIT_LIST_HEAD(&cifsi->lockList);
697 cifs_init_inodecache(void)
699 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
700 sizeof (struct cifsInodeInfo),
701 0, (SLAB_RECLAIM_ACCOUNT|
703 cifs_init_once, NULL);
704 if (cifs_inode_cachep == NULL)
711 cifs_destroy_inodecache(void)
713 kmem_cache_destroy(cifs_inode_cachep);
717 cifs_init_request_bufs(void)
719 if(CIFSMaxBufSize < 8192) {
720 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
721 Unicode path name has to fit in any SMB/CIFS path based frames */
722 CIFSMaxBufSize = 8192;
723 } else if (CIFSMaxBufSize > 1024*127) {
724 CIFSMaxBufSize = 1024 * 127;
726 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
728 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
729 cifs_req_cachep = kmem_cache_create("cifs_request",
731 MAX_CIFS_HDR_SIZE, 0,
732 SLAB_HWCACHE_ALIGN, NULL, NULL);
733 if (cifs_req_cachep == NULL)
738 else if (cifs_min_rcv > 64) {
740 cERROR(1,("cifs_min_rcv set to maximum (64)"));
743 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
746 if(cifs_req_poolp == NULL) {
747 kmem_cache_destroy(cifs_req_cachep);
750 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
751 almost all handle based requests (but not write response, nor is it
752 sufficient for path based requests). A smaller size would have
753 been more efficient (compacting multiple slab items on one 4k page)
754 for the case in which debug was on, but this larger size allows
755 more SMBs to use small buffer alloc and is still much more
756 efficient to alloc 1 per page off the slab compared to 17K (5page)
757 alloc of large cifs buffers even when page debugging is on */
758 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
759 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
761 if (cifs_sm_req_cachep == NULL) {
762 mempool_destroy(cifs_req_poolp);
763 kmem_cache_destroy(cifs_req_cachep);
767 if(cifs_min_small < 2)
769 else if (cifs_min_small > 256) {
770 cifs_min_small = 256;
771 cFYI(1,("cifs_min_small set to maximum (256)"));
774 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
777 if(cifs_sm_req_poolp == NULL) {
778 mempool_destroy(cifs_req_poolp);
779 kmem_cache_destroy(cifs_req_cachep);
780 kmem_cache_destroy(cifs_sm_req_cachep);
788 cifs_destroy_request_bufs(void)
790 mempool_destroy(cifs_req_poolp);
791 kmem_cache_destroy(cifs_req_cachep);
792 mempool_destroy(cifs_sm_req_poolp);
793 kmem_cache_destroy(cifs_sm_req_cachep);
799 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
800 sizeof (struct mid_q_entry), 0,
801 SLAB_HWCACHE_ALIGN, NULL, NULL);
802 if (cifs_mid_cachep == NULL)
805 /* 3 is a reasonable minimum number of simultaneous operations */
806 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
807 if(cifs_mid_poolp == NULL) {
808 kmem_cache_destroy(cifs_mid_cachep);
812 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
813 sizeof (struct oplock_q_entry), 0,
814 SLAB_HWCACHE_ALIGN, NULL, NULL);
815 if (cifs_oplock_cachep == NULL) {
816 kmem_cache_destroy(cifs_mid_cachep);
817 mempool_destroy(cifs_mid_poolp);
825 cifs_destroy_mids(void)
827 mempool_destroy(cifs_mid_poolp);
828 kmem_cache_destroy(cifs_mid_cachep);
829 kmem_cache_destroy(cifs_oplock_cachep);
832 static int cifs_oplock_thread(void * dummyarg)
834 struct oplock_q_entry * oplock_item;
835 struct cifsTconInfo *pTcon;
836 struct inode * inode;
844 spin_lock(&GlobalMid_Lock);
845 if(list_empty(&GlobalOplock_Q)) {
846 spin_unlock(&GlobalMid_Lock);
847 set_current_state(TASK_INTERRUPTIBLE);
848 schedule_timeout(39*HZ);
850 oplock_item = list_entry(GlobalOplock_Q.next,
851 struct oplock_q_entry, qhead);
853 cFYI(1,("found oplock item to write out"));
854 pTcon = oplock_item->tcon;
855 inode = oplock_item->pinode;
856 netfid = oplock_item->netfid;
857 spin_unlock(&GlobalMid_Lock);
858 DeleteOplockQEntry(oplock_item);
859 /* can not grab inode sem here since it would
860 deadlock when oplock received on delete
861 since vfs_unlink holds the i_mutex across
863 /* mutex_lock(&inode->i_mutex);*/
864 if (S_ISREG(inode->i_mode)) {
865 rc = filemap_fdatawrite(inode->i_mapping);
866 if(CIFS_I(inode)->clientCanCacheRead == 0) {
867 filemap_fdatawait(inode->i_mapping);
868 invalidate_remote_inode(inode);
872 /* mutex_unlock(&inode->i_mutex);*/
874 CIFS_I(inode)->write_behind_rc = rc;
875 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
877 /* releasing a stale oplock after recent reconnection
878 of smb session using a now incorrect file
879 handle is not a data integrity issue but do
880 not bother sending an oplock release if session
881 to server still is disconnected since oplock
882 already released by the server in that case */
883 if(pTcon->tidStatus != CifsNeedReconnect) {
884 rc = CIFSSMBLock(0, pTcon, netfid,
885 0 /* len */ , 0 /* offset */, 0,
886 0, LOCKING_ANDX_OPLOCK_RELEASE,
888 cFYI(1,("Oplock release rc = %d ",rc));
891 spin_unlock(&GlobalMid_Lock);
892 set_current_state(TASK_INTERRUPTIBLE);
893 schedule_timeout(1); /* yield in case q were corrupt */
895 } while (!kthread_should_stop());
900 static int cifs_dnotify_thread(void * dummyarg)
902 struct list_head *tmp;
903 struct cifsSesInfo *ses;
908 set_current_state(TASK_INTERRUPTIBLE);
909 schedule_timeout(15*HZ);
910 read_lock(&GlobalSMBSeslock);
911 /* check if any stuck requests that need
912 to be woken up and wakeq so the
913 thread can wake up and error out */
914 list_for_each(tmp, &GlobalSMBSessionList) {
915 ses = list_entry(tmp, struct cifsSesInfo,
917 if(ses && ses->server &&
918 atomic_read(&ses->server->inFlight))
919 wake_up_all(&ses->server->response_q);
921 read_unlock(&GlobalSMBSeslock);
922 } while (!kthread_should_stop());
931 #ifdef CONFIG_PROC_FS
934 /* INIT_LIST_HEAD(&GlobalServerList);*/ /* BB not implemented yet */
935 INIT_LIST_HEAD(&GlobalSMBSessionList);
936 INIT_LIST_HEAD(&GlobalTreeConnectionList);
937 INIT_LIST_HEAD(&GlobalOplock_Q);
938 #ifdef CONFIG_CIFS_EXPERIMENTAL
939 INIT_LIST_HEAD(&GlobalDnotifyReqList);
940 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
943 * Initialize Global counters
945 atomic_set(&sesInfoAllocCount, 0);
946 atomic_set(&tconInfoAllocCount, 0);
947 atomic_set(&tcpSesAllocCount,0);
948 atomic_set(&tcpSesReconnectCount, 0);
949 atomic_set(&tconInfoReconnectCount, 0);
951 atomic_set(&bufAllocCount, 0);
952 atomic_set(&smBufAllocCount, 0);
953 #ifdef CONFIG_CIFS_STATS2
954 atomic_set(&totBufAllocCount, 0);
955 atomic_set(&totSmBufAllocCount, 0);
956 #endif /* CONFIG_CIFS_STATS2 */
958 atomic_set(&midCount, 0);
959 GlobalCurrentXid = 0;
960 GlobalTotalActiveXid = 0;
961 GlobalMaxActiveXid = 0;
962 memset(Local_System_Name, 0, 15);
963 rwlock_init(&GlobalSMBSeslock);
964 spin_lock_init(&GlobalMid_Lock);
966 if(cifs_max_pending < 2) {
967 cifs_max_pending = 2;
968 cFYI(1,("cifs_max_pending set to min of 2"));
969 } else if(cifs_max_pending > 256) {
970 cifs_max_pending = 256;
971 cFYI(1,("cifs_max_pending set to max of 256"));
974 rc = cifs_init_inodecache();
978 rc = cifs_init_mids();
980 goto out_destroy_inodecache;
982 rc = cifs_init_request_bufs();
984 goto out_destroy_mids;
986 rc = register_filesystem(&cifs_fs_type);
988 goto out_destroy_request_bufs;
990 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
991 if (IS_ERR(oplockThread)) {
992 rc = PTR_ERR(oplockThread);
993 cERROR(1,("error %d create oplock thread", rc));
994 goto out_unregister_filesystem;
997 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
998 if (IS_ERR(dnotifyThread)) {
999 rc = PTR_ERR(dnotifyThread);
1000 cERROR(1,("error %d create dnotify thread", rc));
1001 goto out_stop_oplock_thread;
1006 out_stop_oplock_thread:
1007 kthread_stop(oplockThread);
1008 out_unregister_filesystem:
1009 unregister_filesystem(&cifs_fs_type);
1010 out_destroy_request_bufs:
1011 cifs_destroy_request_bufs();
1013 cifs_destroy_mids();
1014 out_destroy_inodecache:
1015 cifs_destroy_inodecache();
1017 #ifdef CONFIG_PROC_FS
1026 cFYI(0, ("In unregister ie exit_cifs"));
1027 #ifdef CONFIG_PROC_FS
1030 unregister_filesystem(&cifs_fs_type);
1031 cifs_destroy_inodecache();
1032 cifs_destroy_mids();
1033 cifs_destroy_request_bufs();
1034 kthread_stop(oplockThread);
1035 kthread_stop(dnotifyThread);
1038 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1039 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1041 ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1042 MODULE_VERSION(CIFS_VERSION);
1043 module_init(init_cifs)
1044 module_exit(exit_cifs)