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 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
67 module_param(CIFSMaxBufSize, int, 0);
68 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
69 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
70 module_param(cifs_min_rcv, int, 0);
71 MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
72 unsigned int cifs_min_small = 30;
73 module_param(cifs_min_small, int, 0);
74 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
75 unsigned int cifs_max_pending = CIFS_MAX_REQ;
76 module_param(cifs_max_pending, int, 0);
77 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
79 extern mempool_t *cifs_sm_req_poolp;
80 extern mempool_t *cifs_req_poolp;
81 extern mempool_t *cifs_mid_poolp;
83 extern kmem_cache_t *cifs_oplock_cachep;
86 cifs_read_super(struct super_block *sb, void *data,
87 const char *devname, int silent)
90 struct cifs_sb_info *cifs_sb;
93 sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
94 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
95 cifs_sb = CIFS_SB(sb);
99 rc = cifs_mount(sb, cifs_sb, data, devname);
104 ("cifs_mount failed w/return code = %d", rc));
105 goto out_mount_failed;
108 sb->s_magic = CIFS_MAGIC_NUMBER;
109 sb->s_op = &cifs_super_ops;
110 /* if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
111 sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
112 #ifdef CONFIG_CIFS_QUOTA
113 sb->s_qcop = &cifs_quotactl_ops;
115 sb->s_blocksize = CIFS_MAX_MSGSIZE;
116 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
117 inode = iget(sb, ROOT_I);
124 sb->s_root = d_alloc_root(inode);
134 cERROR(1, ("cifs_read_super: get root inode failed"));
140 if(cifs_sb->local_nls)
141 unload_nls(cifs_sb->local_nls);
148 cifs_put_super(struct super_block *sb)
151 struct cifs_sb_info *cifs_sb;
153 cFYI(1, ("In cifs_put_super"));
154 cifs_sb = CIFS_SB(sb);
155 if(cifs_sb == NULL) {
156 cFYI(1,("Empty cifs superblock info passed to unmount"));
159 rc = cifs_umount(sb, cifs_sb);
161 cERROR(1, ("cifs_umount failed with return code %d", rc));
163 unload_nls(cifs_sb->local_nls);
169 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
171 struct super_block *sb = dentry->d_sb;
173 int rc = -EOPNOTSUPP;
174 struct cifs_sb_info *cifs_sb;
175 struct cifsTconInfo *pTcon;
179 cifs_sb = CIFS_SB(sb);
180 pTcon = cifs_sb->tcon;
182 buf->f_type = CIFS_MAGIC_NUMBER;
184 /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
185 buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
186 presumably be total path, but note
187 that some servers (includinng Samba 3)
188 have a shorter maximum path */
189 buf->f_files = 0; /* undefined */
190 buf->f_ffree = 0; /* unlimited */
192 #ifdef CONFIG_CIFS_EXPERIMENTAL
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 #endif /* CIFS_EXPERIMENTAL */
203 rc = CIFSSMBQFSInfo(xid, pTcon, buf);
205 /* Old Windows servers do not support level 103, retry with level
206 one if old server failed the previous call */
208 rc = SMBOldQFSInfo(xid, pTcon, buf);
213 /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
215 return 0; /* always return success? what if volume is no
219 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
221 struct cifs_sb_info *cifs_sb;
223 cifs_sb = CIFS_SB(inode->i_sb);
225 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
227 } else /* file mode might have been restricted at mount time
228 on the client (above and beyond ACL on servers) for
229 servers which do not support setting and viewing mode bits,
230 so allowing client to check permissions is useful */
231 return generic_permission(inode, mask, NULL);
234 static kmem_cache_t *cifs_inode_cachep;
235 static kmem_cache_t *cifs_req_cachep;
236 static kmem_cache_t *cifs_mid_cachep;
237 kmem_cache_t *cifs_oplock_cachep;
238 static kmem_cache_t *cifs_sm_req_cachep;
239 mempool_t *cifs_sm_req_poolp;
240 mempool_t *cifs_req_poolp;
241 mempool_t *cifs_mid_poolp;
243 static struct inode *
244 cifs_alloc_inode(struct super_block *sb)
246 struct cifsInodeInfo *cifs_inode;
247 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
250 cifs_inode->cifsAttrs = 0x20; /* default */
251 atomic_set(&cifs_inode->inUse, 0);
252 cifs_inode->time = 0;
253 /* Until the file is open and we have gotten oplock
254 info back from the server, can not assume caching of
255 file data or metadata */
256 cifs_inode->clientCanCacheRead = FALSE;
257 cifs_inode->clientCanCacheAll = FALSE;
258 cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
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 static int cifs_remount(struct super_block *sb, int *flags, char *data)
443 *flags |= MS_NODIRATIME;
447 struct super_operations cifs_super_ops = {
448 .read_inode = cifs_read_inode,
449 .put_super = cifs_put_super,
450 .statfs = cifs_statfs,
451 .alloc_inode = cifs_alloc_inode,
452 .destroy_inode = cifs_destroy_inode,
453 /* .drop_inode = generic_delete_inode,
454 .delete_inode = cifs_delete_inode, *//* Do not need the above two functions
455 unless later we add lazy close of inodes or unless the kernel forgets to call
456 us with the same number of releases (closes) as opens */
457 .show_options = cifs_show_options,
458 .umount_begin = cifs_umount_begin,
459 .remount_fs = cifs_remount,
463 cifs_get_sb(struct file_system_type *fs_type,
464 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
467 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
469 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
476 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
478 up_write(&sb->s_umount);
479 deactivate_super(sb);
482 sb->s_flags |= MS_ACTIVE;
483 return simple_set_mnt(mnt, sb);
486 static ssize_t cifs_file_writev(struct file *file, const struct iovec *iov,
487 unsigned long nr_segs, loff_t *ppos)
489 struct inode *inode = file->f_dentry->d_inode;
492 written = generic_file_writev(file, iov, nr_segs, ppos);
493 if (!CIFS_I(inode)->clientCanCacheAll)
494 filemap_fdatawrite(inode->i_mapping);
498 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
499 size_t count, loff_t pos)
501 struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
504 written = generic_file_aio_write(iocb, buf, count, 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 */
514 int retval = cifs_revalidate(file->f_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 .readv = generic_file_readv,
584 .writev = cifs_file_writev,
585 .aio_read = generic_file_aio_read,
586 .aio_write = cifs_file_aio_write,
588 .release = cifs_close,
592 .mmap = cifs_file_mmap,
593 .sendfile = generic_file_sendfile,
594 .llseek = cifs_llseek,
595 #ifdef CONFIG_CIFS_POSIX
597 #endif /* CONFIG_CIFS_POSIX */
599 #ifdef CONFIG_CIFS_EXPERIMENTAL
600 .dir_notify = cifs_dir_notify,
601 #endif /* CONFIG_CIFS_EXPERIMENTAL */
604 const struct file_operations cifs_file_direct_ops = {
605 /* no mmap, no aio, no readv -
606 BB reevaluate whether they can be done with directio, no cache */
607 .read = cifs_user_read,
608 .write = cifs_user_write,
610 .release = cifs_close,
614 .sendfile = generic_file_sendfile, /* BB removeme BB */
615 #ifdef CONFIG_CIFS_POSIX
617 #endif /* CONFIG_CIFS_POSIX */
618 .llseek = cifs_llseek,
619 #ifdef CONFIG_CIFS_EXPERIMENTAL
620 .dir_notify = cifs_dir_notify,
621 #endif /* CONFIG_CIFS_EXPERIMENTAL */
623 const struct file_operations cifs_file_nobrl_ops = {
624 .read = do_sync_read,
625 .write = do_sync_write,
626 .readv = generic_file_readv,
627 .writev = cifs_file_writev,
628 .aio_read = generic_file_aio_read,
629 .aio_write = cifs_file_aio_write,
631 .release = cifs_close,
634 .mmap = cifs_file_mmap,
635 .sendfile = generic_file_sendfile,
636 .llseek = cifs_llseek,
637 #ifdef CONFIG_CIFS_POSIX
639 #endif /* CONFIG_CIFS_POSIX */
641 #ifdef CONFIG_CIFS_EXPERIMENTAL
642 .dir_notify = cifs_dir_notify,
643 #endif /* CONFIG_CIFS_EXPERIMENTAL */
646 const struct file_operations cifs_file_direct_nobrl_ops = {
647 /* no mmap, no aio, no readv -
648 BB reevaluate whether they can be done with directio, no cache */
649 .read = cifs_user_read,
650 .write = cifs_user_write,
652 .release = cifs_close,
655 .sendfile = generic_file_sendfile, /* BB removeme BB */
656 #ifdef CONFIG_CIFS_POSIX
658 #endif /* CONFIG_CIFS_POSIX */
659 .llseek = cifs_llseek,
660 #ifdef CONFIG_CIFS_EXPERIMENTAL
661 .dir_notify = cifs_dir_notify,
662 #endif /* CONFIG_CIFS_EXPERIMENTAL */
665 const struct file_operations cifs_dir_ops = {
666 .readdir = cifs_readdir,
667 .release = cifs_closedir,
668 .read = generic_read_dir,
669 #ifdef CONFIG_CIFS_EXPERIMENTAL
670 .dir_notify = cifs_dir_notify,
671 #endif /* CONFIG_CIFS_EXPERIMENTAL */
676 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
678 struct cifsInodeInfo *cifsi = inode;
680 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
681 SLAB_CTOR_CONSTRUCTOR) {
682 inode_init_once(&cifsi->vfs_inode);
683 INIT_LIST_HEAD(&cifsi->lockList);
688 cifs_init_inodecache(void)
690 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
691 sizeof (struct cifsInodeInfo),
692 0, (SLAB_RECLAIM_ACCOUNT|
694 cifs_init_once, NULL);
695 if (cifs_inode_cachep == NULL)
702 cifs_destroy_inodecache(void)
704 if (kmem_cache_destroy(cifs_inode_cachep))
705 printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
709 cifs_init_request_bufs(void)
711 if(CIFSMaxBufSize < 8192) {
712 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
713 Unicode path name has to fit in any SMB/CIFS path based frames */
714 CIFSMaxBufSize = 8192;
715 } else if (CIFSMaxBufSize > 1024*127) {
716 CIFSMaxBufSize = 1024 * 127;
718 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
720 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
721 cifs_req_cachep = kmem_cache_create("cifs_request",
723 MAX_CIFS_HDR_SIZE, 0,
724 SLAB_HWCACHE_ALIGN, NULL, NULL);
725 if (cifs_req_cachep == NULL)
730 else if (cifs_min_rcv > 64) {
732 cERROR(1,("cifs_min_rcv set to maximum (64)"));
735 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
738 if(cifs_req_poolp == NULL) {
739 kmem_cache_destroy(cifs_req_cachep);
742 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
743 almost all handle based requests (but not write response, nor is it
744 sufficient for path based requests). A smaller size would have
745 been more efficient (compacting multiple slab items on one 4k page)
746 for the case in which debug was on, but this larger size allows
747 more SMBs to use small buffer alloc and is still much more
748 efficient to alloc 1 per page off the slab compared to 17K (5page)
749 alloc of large cifs buffers even when page debugging is on */
750 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
751 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
753 if (cifs_sm_req_cachep == NULL) {
754 mempool_destroy(cifs_req_poolp);
755 kmem_cache_destroy(cifs_req_cachep);
759 if(cifs_min_small < 2)
761 else if (cifs_min_small > 256) {
762 cifs_min_small = 256;
763 cFYI(1,("cifs_min_small set to maximum (256)"));
766 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
769 if(cifs_sm_req_poolp == NULL) {
770 mempool_destroy(cifs_req_poolp);
771 kmem_cache_destroy(cifs_req_cachep);
772 kmem_cache_destroy(cifs_sm_req_cachep);
780 cifs_destroy_request_bufs(void)
782 mempool_destroy(cifs_req_poolp);
783 if (kmem_cache_destroy(cifs_req_cachep))
785 "cifs_destroy_request_cache: error not all structures were freed\n");
786 mempool_destroy(cifs_sm_req_poolp);
787 if (kmem_cache_destroy(cifs_sm_req_cachep))
789 "cifs_destroy_request_cache: cifs_small_rq free error\n");
795 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
796 sizeof (struct mid_q_entry), 0,
797 SLAB_HWCACHE_ALIGN, NULL, NULL);
798 if (cifs_mid_cachep == NULL)
801 /* 3 is a reasonable minimum number of simultaneous operations */
802 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
803 if(cifs_mid_poolp == NULL) {
804 kmem_cache_destroy(cifs_mid_cachep);
808 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
809 sizeof (struct oplock_q_entry), 0,
810 SLAB_HWCACHE_ALIGN, NULL, NULL);
811 if (cifs_oplock_cachep == NULL) {
812 kmem_cache_destroy(cifs_mid_cachep);
813 mempool_destroy(cifs_mid_poolp);
821 cifs_destroy_mids(void)
823 mempool_destroy(cifs_mid_poolp);
824 if (kmem_cache_destroy(cifs_mid_cachep))
826 "cifs_destroy_mids: error not all structures were freed\n");
828 if (kmem_cache_destroy(cifs_oplock_cachep))
830 "error not all oplock structures were freed\n");
833 static int cifs_oplock_thread(void * dummyarg)
835 struct oplock_q_entry * oplock_item;
836 struct cifsTconInfo *pTcon;
837 struct inode * inode;
845 spin_lock(&GlobalMid_Lock);
846 if(list_empty(&GlobalOplock_Q)) {
847 spin_unlock(&GlobalMid_Lock);
848 set_current_state(TASK_INTERRUPTIBLE);
849 schedule_timeout(39*HZ);
851 oplock_item = list_entry(GlobalOplock_Q.next,
852 struct oplock_q_entry, qhead);
854 cFYI(1,("found oplock item to write out"));
855 pTcon = oplock_item->tcon;
856 inode = oplock_item->pinode;
857 netfid = oplock_item->netfid;
858 spin_unlock(&GlobalMid_Lock);
859 DeleteOplockQEntry(oplock_item);
860 /* can not grab inode sem here since it would
861 deadlock when oplock received on delete
862 since vfs_unlink holds the i_mutex across
864 /* mutex_lock(&inode->i_mutex);*/
865 if (S_ISREG(inode->i_mode)) {
866 rc = filemap_fdatawrite(inode->i_mapping);
867 if(CIFS_I(inode)->clientCanCacheRead == 0) {
868 filemap_fdatawait(inode->i_mapping);
869 invalidate_remote_inode(inode);
873 /* mutex_unlock(&inode->i_mutex);*/
875 CIFS_I(inode)->write_behind_rc = rc;
876 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
878 /* releasing a stale oplock after recent reconnection
879 of smb session using a now incorrect file
880 handle is not a data integrity issue but do
881 not bother sending an oplock release if session
882 to server still is disconnected since oplock
883 already released by the server in that case */
884 if(pTcon->tidStatus != CifsNeedReconnect) {
885 rc = CIFSSMBLock(0, pTcon, netfid,
886 0 /* len */ , 0 /* offset */, 0,
887 0, LOCKING_ANDX_OPLOCK_RELEASE,
889 cFYI(1,("Oplock release rc = %d ",rc));
892 spin_unlock(&GlobalMid_Lock);
893 set_current_state(TASK_INTERRUPTIBLE);
894 schedule_timeout(1); /* yield in case q were corrupt */
896 } while (!kthread_should_stop());
901 static int cifs_dnotify_thread(void * dummyarg)
903 struct list_head *tmp;
904 struct cifsSesInfo *ses;
909 set_current_state(TASK_INTERRUPTIBLE);
910 schedule_timeout(15*HZ);
911 read_lock(&GlobalSMBSeslock);
912 /* check if any stuck requests that need
913 to be woken up and wakeq so the
914 thread can wake up and error out */
915 list_for_each(tmp, &GlobalSMBSessionList) {
916 ses = list_entry(tmp, struct cifsSesInfo,
918 if(ses && ses->server &&
919 atomic_read(&ses->server->inFlight))
920 wake_up_all(&ses->server->response_q);
922 read_unlock(&GlobalSMBSeslock);
923 } while (!kthread_should_stop());
932 #ifdef CONFIG_PROC_FS
935 INIT_LIST_HEAD(&GlobalServerList); /* BB not implemented yet */
936 INIT_LIST_HEAD(&GlobalSMBSessionList);
937 INIT_LIST_HEAD(&GlobalTreeConnectionList);
938 INIT_LIST_HEAD(&GlobalOplock_Q);
939 #ifdef CONFIG_CIFS_EXPERIMENTAL
940 INIT_LIST_HEAD(&GlobalDnotifyReqList);
941 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
944 * Initialize Global counters
946 atomic_set(&sesInfoAllocCount, 0);
947 atomic_set(&tconInfoAllocCount, 0);
948 atomic_set(&tcpSesAllocCount,0);
949 atomic_set(&tcpSesReconnectCount, 0);
950 atomic_set(&tconInfoReconnectCount, 0);
952 atomic_set(&bufAllocCount, 0);
953 atomic_set(&smBufAllocCount, 0);
954 #ifdef CONFIG_CIFS_STATS2
955 atomic_set(&totBufAllocCount, 0);
956 atomic_set(&totSmBufAllocCount, 0);
957 #endif /* CONFIG_CIFS_STATS2 */
959 atomic_set(&midCount, 0);
960 GlobalCurrentXid = 0;
961 GlobalTotalActiveXid = 0;
962 GlobalMaxActiveXid = 0;
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)