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 #ifdef CONFIG_CIFS_EXPERIMENTAL
406 static void cifs_umount_begin(struct super_block * sblock)
408 struct cifs_sb_info *cifs_sb;
409 struct cifsTconInfo * tcon;
411 cifs_sb = CIFS_SB(sblock);
415 tcon = cifs_sb->tcon;
418 down(&tcon->tconSem);
419 if (atomic_read(&tcon->useCount) == 1)
420 tcon->tidStatus = CifsExiting;
423 /* cancel_brl_requests(tcon); */
424 /* cancel_notify_requests(tcon); */
425 if(tcon->ses && tcon->ses->server)
427 cFYI(1,("wake up tasks now - umount begin not complete"));
428 wake_up_all(&tcon->ses->server->request_q);
429 wake_up_all(&tcon->ses->server->response_q);
430 msleep(1); /* yield */
431 /* we have to kick the requests once more */
432 wake_up_all(&tcon->ses->server->response_q);
435 /* 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 #ifdef CONFIG_CIFS_EXPERIMENTAL
459 .umount_begin = cifs_umount_begin,
461 .remount_fs = cifs_remount,
465 cifs_get_sb(struct file_system_type *fs_type,
466 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
469 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
471 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
478 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
480 up_write(&sb->s_umount);
481 deactivate_super(sb);
484 sb->s_flags |= MS_ACTIVE;
485 return simple_set_mnt(mnt, sb);
488 static ssize_t cifs_file_writev(struct file *file, const struct iovec *iov,
489 unsigned long nr_segs, loff_t *ppos)
491 struct inode *inode = file->f_dentry->d_inode;
494 written = generic_file_writev(file, iov, nr_segs, ppos);
495 if (!CIFS_I(inode)->clientCanCacheAll)
496 filemap_fdatawrite(inode->i_mapping);
500 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
501 size_t count, loff_t pos)
503 struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
506 written = generic_file_aio_write(iocb, buf, count, pos);
507 if (!CIFS_I(inode)->clientCanCacheAll)
508 filemap_fdatawrite(inode->i_mapping);
512 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
514 /* origin == SEEK_END => we must revalidate the cached file length */
516 int retval = cifs_revalidate(file->f_dentry);
518 return (loff_t)retval;
520 return remote_llseek(file, offset, origin);
523 static struct file_system_type cifs_fs_type = {
524 .owner = THIS_MODULE,
526 .get_sb = cifs_get_sb,
527 .kill_sb = kill_anon_super,
530 struct inode_operations cifs_dir_inode_ops = {
531 .create = cifs_create,
532 .lookup = cifs_lookup,
533 .getattr = cifs_getattr,
534 .unlink = cifs_unlink,
535 .link = cifs_hardlink,
538 .rename = cifs_rename,
539 .permission = cifs_permission,
540 /* revalidate:cifs_revalidate, */
541 .setattr = cifs_setattr,
542 .symlink = cifs_symlink,
544 #ifdef CONFIG_CIFS_XATTR
545 .setxattr = cifs_setxattr,
546 .getxattr = cifs_getxattr,
547 .listxattr = cifs_listxattr,
548 .removexattr = cifs_removexattr,
552 struct inode_operations cifs_file_inode_ops = {
553 /* revalidate:cifs_revalidate, */
554 .setattr = cifs_setattr,
555 .getattr = cifs_getattr, /* do we need this anymore? */
556 .rename = cifs_rename,
557 .permission = cifs_permission,
558 #ifdef CONFIG_CIFS_XATTR
559 .setxattr = cifs_setxattr,
560 .getxattr = cifs_getxattr,
561 .listxattr = cifs_listxattr,
562 .removexattr = cifs_removexattr,
566 struct inode_operations cifs_symlink_inode_ops = {
567 .readlink = generic_readlink,
568 .follow_link = cifs_follow_link,
569 .put_link = cifs_put_link,
570 .permission = cifs_permission,
571 /* BB add the following two eventually */
572 /* revalidate: cifs_revalidate,
573 setattr: cifs_notify_change, *//* BB do we need notify change */
574 #ifdef CONFIG_CIFS_XATTR
575 .setxattr = cifs_setxattr,
576 .getxattr = cifs_getxattr,
577 .listxattr = cifs_listxattr,
578 .removexattr = cifs_removexattr,
582 const struct file_operations cifs_file_ops = {
583 .read = do_sync_read,
584 .write = do_sync_write,
585 .readv = generic_file_readv,
586 .writev = cifs_file_writev,
587 .aio_read = generic_file_aio_read,
588 .aio_write = cifs_file_aio_write,
590 .release = cifs_close,
594 .mmap = cifs_file_mmap,
595 .sendfile = generic_file_sendfile,
596 .llseek = cifs_llseek,
597 #ifdef CONFIG_CIFS_POSIX
599 #endif /* CONFIG_CIFS_POSIX */
601 #ifdef CONFIG_CIFS_EXPERIMENTAL
602 .dir_notify = cifs_dir_notify,
603 #endif /* CONFIG_CIFS_EXPERIMENTAL */
606 const struct file_operations cifs_file_direct_ops = {
607 /* no mmap, no aio, no readv -
608 BB reevaluate whether they can be done with directio, no cache */
609 .read = cifs_user_read,
610 .write = cifs_user_write,
612 .release = cifs_close,
616 .sendfile = generic_file_sendfile, /* BB removeme BB */
617 #ifdef CONFIG_CIFS_POSIX
619 #endif /* CONFIG_CIFS_POSIX */
620 .llseek = cifs_llseek,
621 #ifdef CONFIG_CIFS_EXPERIMENTAL
622 .dir_notify = cifs_dir_notify,
623 #endif /* CONFIG_CIFS_EXPERIMENTAL */
625 const struct file_operations cifs_file_nobrl_ops = {
626 .read = do_sync_read,
627 .write = do_sync_write,
628 .readv = generic_file_readv,
629 .writev = cifs_file_writev,
630 .aio_read = generic_file_aio_read,
631 .aio_write = cifs_file_aio_write,
633 .release = cifs_close,
636 .mmap = cifs_file_mmap,
637 .sendfile = generic_file_sendfile,
638 .llseek = cifs_llseek,
639 #ifdef CONFIG_CIFS_POSIX
641 #endif /* CONFIG_CIFS_POSIX */
643 #ifdef CONFIG_CIFS_EXPERIMENTAL
644 .dir_notify = cifs_dir_notify,
645 #endif /* CONFIG_CIFS_EXPERIMENTAL */
648 const struct file_operations cifs_file_direct_nobrl_ops = {
649 /* no mmap, no aio, no readv -
650 BB reevaluate whether they can be done with directio, no cache */
651 .read = cifs_user_read,
652 .write = cifs_user_write,
654 .release = cifs_close,
657 .sendfile = generic_file_sendfile, /* BB removeme BB */
658 #ifdef CONFIG_CIFS_POSIX
660 #endif /* CONFIG_CIFS_POSIX */
661 .llseek = cifs_llseek,
662 #ifdef CONFIG_CIFS_EXPERIMENTAL
663 .dir_notify = cifs_dir_notify,
664 #endif /* CONFIG_CIFS_EXPERIMENTAL */
667 const struct file_operations cifs_dir_ops = {
668 .readdir = cifs_readdir,
669 .release = cifs_closedir,
670 .read = generic_read_dir,
671 #ifdef CONFIG_CIFS_EXPERIMENTAL
672 .dir_notify = cifs_dir_notify,
673 #endif /* CONFIG_CIFS_EXPERIMENTAL */
678 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
680 struct cifsInodeInfo *cifsi = inode;
682 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
683 SLAB_CTOR_CONSTRUCTOR) {
684 inode_init_once(&cifsi->vfs_inode);
685 INIT_LIST_HEAD(&cifsi->lockList);
690 cifs_init_inodecache(void)
692 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
693 sizeof (struct cifsInodeInfo),
694 0, (SLAB_RECLAIM_ACCOUNT|
696 cifs_init_once, NULL);
697 if (cifs_inode_cachep == NULL)
704 cifs_destroy_inodecache(void)
706 if (kmem_cache_destroy(cifs_inode_cachep))
707 printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
711 cifs_init_request_bufs(void)
713 if(CIFSMaxBufSize < 8192) {
714 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
715 Unicode path name has to fit in any SMB/CIFS path based frames */
716 CIFSMaxBufSize = 8192;
717 } else if (CIFSMaxBufSize > 1024*127) {
718 CIFSMaxBufSize = 1024 * 127;
720 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
722 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
723 cifs_req_cachep = kmem_cache_create("cifs_request",
725 MAX_CIFS_HDR_SIZE, 0,
726 SLAB_HWCACHE_ALIGN, NULL, NULL);
727 if (cifs_req_cachep == NULL)
732 else if (cifs_min_rcv > 64) {
734 cERROR(1,("cifs_min_rcv set to maximum (64)"));
737 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
740 if(cifs_req_poolp == NULL) {
741 kmem_cache_destroy(cifs_req_cachep);
744 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
745 almost all handle based requests (but not write response, nor is it
746 sufficient for path based requests). A smaller size would have
747 been more efficient (compacting multiple slab items on one 4k page)
748 for the case in which debug was on, but this larger size allows
749 more SMBs to use small buffer alloc and is still much more
750 efficient to alloc 1 per page off the slab compared to 17K (5page)
751 alloc of large cifs buffers even when page debugging is on */
752 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
753 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
755 if (cifs_sm_req_cachep == NULL) {
756 mempool_destroy(cifs_req_poolp);
757 kmem_cache_destroy(cifs_req_cachep);
761 if(cifs_min_small < 2)
763 else if (cifs_min_small > 256) {
764 cifs_min_small = 256;
765 cFYI(1,("cifs_min_small set to maximum (256)"));
768 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
771 if(cifs_sm_req_poolp == NULL) {
772 mempool_destroy(cifs_req_poolp);
773 kmem_cache_destroy(cifs_req_cachep);
774 kmem_cache_destroy(cifs_sm_req_cachep);
782 cifs_destroy_request_bufs(void)
784 mempool_destroy(cifs_req_poolp);
785 if (kmem_cache_destroy(cifs_req_cachep))
787 "cifs_destroy_request_cache: error not all structures were freed\n");
788 mempool_destroy(cifs_sm_req_poolp);
789 if (kmem_cache_destroy(cifs_sm_req_cachep))
791 "cifs_destroy_request_cache: cifs_small_rq free error\n");
797 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
798 sizeof (struct mid_q_entry), 0,
799 SLAB_HWCACHE_ALIGN, NULL, NULL);
800 if (cifs_mid_cachep == NULL)
803 /* 3 is a reasonable minimum number of simultaneous operations */
804 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
805 if(cifs_mid_poolp == NULL) {
806 kmem_cache_destroy(cifs_mid_cachep);
810 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
811 sizeof (struct oplock_q_entry), 0,
812 SLAB_HWCACHE_ALIGN, NULL, NULL);
813 if (cifs_oplock_cachep == NULL) {
814 kmem_cache_destroy(cifs_mid_cachep);
815 mempool_destroy(cifs_mid_poolp);
823 cifs_destroy_mids(void)
825 mempool_destroy(cifs_mid_poolp);
826 if (kmem_cache_destroy(cifs_mid_cachep))
828 "cifs_destroy_mids: error not all structures were freed\n");
830 if (kmem_cache_destroy(cifs_oplock_cachep))
832 "error not all oplock structures were freed\n");
835 static int cifs_oplock_thread(void * dummyarg)
837 struct oplock_q_entry * oplock_item;
838 struct cifsTconInfo *pTcon;
839 struct inode * inode;
847 spin_lock(&GlobalMid_Lock);
848 if(list_empty(&GlobalOplock_Q)) {
849 spin_unlock(&GlobalMid_Lock);
850 set_current_state(TASK_INTERRUPTIBLE);
851 schedule_timeout(39*HZ);
853 oplock_item = list_entry(GlobalOplock_Q.next,
854 struct oplock_q_entry, qhead);
856 cFYI(1,("found oplock item to write out"));
857 pTcon = oplock_item->tcon;
858 inode = oplock_item->pinode;
859 netfid = oplock_item->netfid;
860 spin_unlock(&GlobalMid_Lock);
861 DeleteOplockQEntry(oplock_item);
862 /* can not grab inode sem here since it would
863 deadlock when oplock received on delete
864 since vfs_unlink holds the i_mutex across
866 /* mutex_lock(&inode->i_mutex);*/
867 if (S_ISREG(inode->i_mode)) {
868 rc = filemap_fdatawrite(inode->i_mapping);
869 if(CIFS_I(inode)->clientCanCacheRead == 0) {
870 filemap_fdatawait(inode->i_mapping);
871 invalidate_remote_inode(inode);
875 /* mutex_unlock(&inode->i_mutex);*/
877 CIFS_I(inode)->write_behind_rc = rc;
878 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
880 /* releasing a stale oplock after recent reconnection
881 of smb session using a now incorrect file
882 handle is not a data integrity issue but do
883 not bother sending an oplock release if session
884 to server still is disconnected since oplock
885 already released by the server in that case */
886 if(pTcon->tidStatus != CifsNeedReconnect) {
887 rc = CIFSSMBLock(0, pTcon, netfid,
888 0 /* len */ , 0 /* offset */, 0,
889 0, LOCKING_ANDX_OPLOCK_RELEASE,
891 cFYI(1,("Oplock release rc = %d ",rc));
894 spin_unlock(&GlobalMid_Lock);
895 set_current_state(TASK_INTERRUPTIBLE);
896 schedule_timeout(1); /* yield in case q were corrupt */
898 } while (!kthread_should_stop());
903 static int cifs_dnotify_thread(void * dummyarg)
905 struct list_head *tmp;
906 struct cifsSesInfo *ses;
911 set_current_state(TASK_INTERRUPTIBLE);
912 schedule_timeout(15*HZ);
913 read_lock(&GlobalSMBSeslock);
914 /* check if any stuck requests that need
915 to be woken up and wakeq so the
916 thread can wake up and error out */
917 list_for_each(tmp, &GlobalSMBSessionList) {
918 ses = list_entry(tmp, struct cifsSesInfo,
920 if(ses && ses->server &&
921 atomic_read(&ses->server->inFlight))
922 wake_up_all(&ses->server->response_q);
924 read_unlock(&GlobalSMBSeslock);
925 } while (!kthread_should_stop());
934 #ifdef CONFIG_PROC_FS
937 INIT_LIST_HEAD(&GlobalServerList); /* BB not implemented yet */
938 INIT_LIST_HEAD(&GlobalSMBSessionList);
939 INIT_LIST_HEAD(&GlobalTreeConnectionList);
940 INIT_LIST_HEAD(&GlobalOplock_Q);
941 #ifdef CONFIG_CIFS_EXPERIMENTAL
942 INIT_LIST_HEAD(&GlobalDnotifyReqList);
943 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
946 * Initialize Global counters
948 atomic_set(&sesInfoAllocCount, 0);
949 atomic_set(&tconInfoAllocCount, 0);
950 atomic_set(&tcpSesAllocCount,0);
951 atomic_set(&tcpSesReconnectCount, 0);
952 atomic_set(&tconInfoReconnectCount, 0);
954 atomic_set(&bufAllocCount, 0);
955 atomic_set(&smBufAllocCount, 0);
956 #ifdef CONFIG_CIFS_STATS2
957 atomic_set(&totBufAllocCount, 0);
958 atomic_set(&totSmBufAllocCount, 0);
959 #endif /* CONFIG_CIFS_STATS2 */
961 atomic_set(&midCount, 0);
962 GlobalCurrentXid = 0;
963 GlobalTotalActiveXid = 0;
964 GlobalMaxActiveXid = 0;
965 rwlock_init(&GlobalSMBSeslock);
966 spin_lock_init(&GlobalMid_Lock);
968 if(cifs_max_pending < 2) {
969 cifs_max_pending = 2;
970 cFYI(1,("cifs_max_pending set to min of 2"));
971 } else if(cifs_max_pending > 256) {
972 cifs_max_pending = 256;
973 cFYI(1,("cifs_max_pending set to max of 256"));
976 rc = cifs_init_inodecache();
980 rc = cifs_init_mids();
982 goto out_destroy_inodecache;
984 rc = cifs_init_request_bufs();
986 goto out_destroy_mids;
988 rc = register_filesystem(&cifs_fs_type);
990 goto out_destroy_request_bufs;
992 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
993 if (IS_ERR(oplockThread)) {
994 rc = PTR_ERR(oplockThread);
995 cERROR(1,("error %d create oplock thread", rc));
996 goto out_unregister_filesystem;
999 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1000 if (IS_ERR(dnotifyThread)) {
1001 rc = PTR_ERR(dnotifyThread);
1002 cERROR(1,("error %d create dnotify thread", rc));
1003 goto out_stop_oplock_thread;
1008 out_stop_oplock_thread:
1009 kthread_stop(oplockThread);
1010 out_unregister_filesystem:
1011 unregister_filesystem(&cifs_fs_type);
1012 out_destroy_request_bufs:
1013 cifs_destroy_request_bufs();
1015 cifs_destroy_mids();
1016 out_destroy_inodecache:
1017 cifs_destroy_inodecache();
1019 #ifdef CONFIG_PROC_FS
1028 cFYI(0, ("In unregister ie exit_cifs"));
1029 #ifdef CONFIG_PROC_FS
1032 unregister_filesystem(&cifs_fs_type);
1033 cifs_destroy_inodecache();
1034 cifs_destroy_mids();
1035 cifs_destroy_request_bufs();
1036 kthread_stop(oplockThread);
1037 kthread_stop(dnotifyThread);
1040 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1041 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1043 ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1044 MODULE_VERSION(CIFS_VERSION);
1045 module_init(init_cifs)
1046 module_exit(exit_cifs)