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 /* BB we could add a second check for a QFS Unix capability bit */
193 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
194 if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
195 le64_to_cpu(pTcon->fsUnixInfo.Capability)))
196 rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
198 /* Only need to call the old QFSInfo if failed
201 rc = CIFSSMBQFSInfo(xid, pTcon, buf);
203 /* Old Windows servers do not support level 103, retry with level
204 one if old server failed the previous call */
206 rc = SMBOldQFSInfo(xid, pTcon, buf);
211 /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
213 return 0; /* always return success? what if volume is no
217 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
219 struct cifs_sb_info *cifs_sb;
221 cifs_sb = CIFS_SB(inode->i_sb);
223 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
225 } else /* file mode might have been restricted at mount time
226 on the client (above and beyond ACL on servers) for
227 servers which do not support setting and viewing mode bits,
228 so allowing client to check permissions is useful */
229 return generic_permission(inode, mask, NULL);
232 static kmem_cache_t *cifs_inode_cachep;
233 static kmem_cache_t *cifs_req_cachep;
234 static kmem_cache_t *cifs_mid_cachep;
235 kmem_cache_t *cifs_oplock_cachep;
236 static kmem_cache_t *cifs_sm_req_cachep;
237 mempool_t *cifs_sm_req_poolp;
238 mempool_t *cifs_req_poolp;
239 mempool_t *cifs_mid_poolp;
241 static struct inode *
242 cifs_alloc_inode(struct super_block *sb)
244 struct cifsInodeInfo *cifs_inode;
245 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
248 cifs_inode->cifsAttrs = 0x20; /* default */
249 atomic_set(&cifs_inode->inUse, 0);
250 cifs_inode->time = 0;
251 /* Until the file is open and we have gotten oplock
252 info back from the server, can not assume caching of
253 file data or metadata */
254 cifs_inode->clientCanCacheRead = FALSE;
255 cifs_inode->clientCanCacheAll = FALSE;
256 cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
257 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
258 cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
259 INIT_LIST_HEAD(&cifs_inode->openFileList);
260 return &cifs_inode->vfs_inode;
264 cifs_destroy_inode(struct inode *inode)
266 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
270 * cifs_show_options() is for displaying mount options in /proc/mounts.
271 * Not all settable options are displayed but most of the important
275 cifs_show_options(struct seq_file *s, struct vfsmount *m)
277 struct cifs_sb_info *cifs_sb;
279 cifs_sb = CIFS_SB(m->mnt_sb);
283 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
284 if (cifs_sb->tcon->ses) {
285 if (cifs_sb->tcon->ses->userName)
286 seq_printf(s, ",username=%s",
287 cifs_sb->tcon->ses->userName);
288 if(cifs_sb->tcon->ses->domainName)
289 seq_printf(s, ",domain=%s",
290 cifs_sb->tcon->ses->domainName);
293 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
294 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
299 #ifdef CONFIG_CIFS_QUOTA
300 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
301 struct fs_disk_quota * pdquota)
305 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
306 struct cifsTconInfo *pTcon;
309 pTcon = cifs_sb->tcon;
316 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
325 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
326 struct fs_disk_quota * pdquota)
330 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
331 struct cifsTconInfo *pTcon;
334 pTcon = cifs_sb->tcon;
340 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
349 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
353 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
354 struct cifsTconInfo *pTcon;
357 pTcon = cifs_sb->tcon;
363 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
372 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
376 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
377 struct cifsTconInfo *pTcon;
380 pTcon = cifs_sb->tcon;
386 cFYI(1,("pqstats %p",qstats));
395 static struct quotactl_ops cifs_quotactl_ops = {
396 .set_xquota = cifs_xquota_set,
397 .get_xquota = cifs_xquota_set,
398 .set_xstate = cifs_xstate_set,
399 .get_xstate = cifs_xstate_get,
403 static void cifs_umount_begin(struct vfsmount * vfsmnt, int flags)
405 struct cifs_sb_info *cifs_sb;
406 struct cifsTconInfo * tcon;
408 if (!(flags & MNT_FORCE))
410 cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
414 tcon = cifs_sb->tcon;
417 down(&tcon->tconSem);
418 if (atomic_read(&tcon->useCount) == 1)
419 tcon->tidStatus = CifsExiting;
422 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
423 /* cancel_notify_requests(tcon); */
424 if(tcon->ses && tcon->ses->server)
426 cFYI(1,("wake up tasks now - umount begin not complete"));
427 wake_up_all(&tcon->ses->server->request_q);
428 wake_up_all(&tcon->ses->server->response_q);
429 msleep(1); /* yield */
430 /* we have to kick the requests once more */
431 wake_up_all(&tcon->ses->server->response_q);
434 /* BB FIXME - finish add checks for tidStatus BB */
439 static int cifs_remount(struct super_block *sb, int *flags, char *data)
441 *flags |= MS_NODIRATIME;
445 struct super_operations cifs_super_ops = {
446 .read_inode = cifs_read_inode,
447 .put_super = cifs_put_super,
448 .statfs = cifs_statfs,
449 .alloc_inode = cifs_alloc_inode,
450 .destroy_inode = cifs_destroy_inode,
451 /* .drop_inode = generic_delete_inode,
452 .delete_inode = cifs_delete_inode, *//* Do not need the above two functions
453 unless later we add lazy close of inodes or unless the kernel forgets to call
454 us with the same number of releases (closes) as opens */
455 .show_options = cifs_show_options,
456 .umount_begin = cifs_umount_begin,
457 .remount_fs = cifs_remount,
461 cifs_get_sb(struct file_system_type *fs_type,
462 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
465 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
467 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
474 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
476 up_write(&sb->s_umount);
477 deactivate_super(sb);
480 sb->s_flags |= MS_ACTIVE;
481 return simple_set_mnt(mnt, sb);
484 static ssize_t cifs_file_writev(struct file *file, const struct iovec *iov,
485 unsigned long nr_segs, loff_t *ppos)
487 struct inode *inode = file->f_dentry->d_inode;
490 written = generic_file_writev(file, iov, nr_segs, ppos);
491 if (!CIFS_I(inode)->clientCanCacheAll)
492 filemap_fdatawrite(inode->i_mapping);
496 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
497 size_t count, loff_t pos)
499 struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
502 written = generic_file_aio_write(iocb, buf, count, pos);
503 if (!CIFS_I(inode)->clientCanCacheAll)
504 filemap_fdatawrite(inode->i_mapping);
508 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
510 /* origin == SEEK_END => we must revalidate the cached file length */
512 int retval = cifs_revalidate(file->f_dentry);
514 return (loff_t)retval;
516 return remote_llseek(file, offset, origin);
519 static struct file_system_type cifs_fs_type = {
520 .owner = THIS_MODULE,
522 .get_sb = cifs_get_sb,
523 .kill_sb = kill_anon_super,
526 struct inode_operations cifs_dir_inode_ops = {
527 .create = cifs_create,
528 .lookup = cifs_lookup,
529 .getattr = cifs_getattr,
530 .unlink = cifs_unlink,
531 .link = cifs_hardlink,
534 .rename = cifs_rename,
535 .permission = cifs_permission,
536 /* revalidate:cifs_revalidate, */
537 .setattr = cifs_setattr,
538 .symlink = cifs_symlink,
540 #ifdef CONFIG_CIFS_XATTR
541 .setxattr = cifs_setxattr,
542 .getxattr = cifs_getxattr,
543 .listxattr = cifs_listxattr,
544 .removexattr = cifs_removexattr,
548 struct inode_operations cifs_file_inode_ops = {
549 /* revalidate:cifs_revalidate, */
550 .setattr = cifs_setattr,
551 .getattr = cifs_getattr, /* do we need this anymore? */
552 .rename = cifs_rename,
553 .permission = cifs_permission,
554 #ifdef CONFIG_CIFS_XATTR
555 .setxattr = cifs_setxattr,
556 .getxattr = cifs_getxattr,
557 .listxattr = cifs_listxattr,
558 .removexattr = cifs_removexattr,
562 struct inode_operations cifs_symlink_inode_ops = {
563 .readlink = generic_readlink,
564 .follow_link = cifs_follow_link,
565 .put_link = cifs_put_link,
566 .permission = cifs_permission,
567 /* BB add the following two eventually */
568 /* revalidate: cifs_revalidate,
569 setattr: cifs_notify_change, *//* BB do we need notify change */
570 #ifdef CONFIG_CIFS_XATTR
571 .setxattr = cifs_setxattr,
572 .getxattr = cifs_getxattr,
573 .listxattr = cifs_listxattr,
574 .removexattr = cifs_removexattr,
578 const struct file_operations cifs_file_ops = {
579 .read = do_sync_read,
580 .write = do_sync_write,
581 .readv = generic_file_readv,
582 .writev = cifs_file_writev,
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 .readv = generic_file_readv,
625 .writev = cifs_file_writev,
626 .aio_read = generic_file_aio_read,
627 .aio_write = cifs_file_aio_write,
629 .release = cifs_close,
632 .mmap = cifs_file_mmap,
633 .sendfile = generic_file_sendfile,
634 .llseek = cifs_llseek,
635 #ifdef CONFIG_CIFS_POSIX
637 #endif /* CONFIG_CIFS_POSIX */
639 #ifdef CONFIG_CIFS_EXPERIMENTAL
640 .dir_notify = cifs_dir_notify,
641 #endif /* CONFIG_CIFS_EXPERIMENTAL */
644 const struct file_operations cifs_file_direct_nobrl_ops = {
645 /* no mmap, no aio, no readv -
646 BB reevaluate whether they can be done with directio, no cache */
647 .read = cifs_user_read,
648 .write = cifs_user_write,
650 .release = cifs_close,
653 .sendfile = generic_file_sendfile, /* BB removeme BB */
654 #ifdef CONFIG_CIFS_POSIX
656 #endif /* CONFIG_CIFS_POSIX */
657 .llseek = cifs_llseek,
658 #ifdef CONFIG_CIFS_EXPERIMENTAL
659 .dir_notify = cifs_dir_notify,
660 #endif /* CONFIG_CIFS_EXPERIMENTAL */
663 const struct file_operations cifs_dir_ops = {
664 .readdir = cifs_readdir,
665 .release = cifs_closedir,
666 .read = generic_read_dir,
667 #ifdef CONFIG_CIFS_EXPERIMENTAL
668 .dir_notify = cifs_dir_notify,
669 #endif /* CONFIG_CIFS_EXPERIMENTAL */
674 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
676 struct cifsInodeInfo *cifsi = inode;
678 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
679 SLAB_CTOR_CONSTRUCTOR) {
680 inode_init_once(&cifsi->vfs_inode);
681 INIT_LIST_HEAD(&cifsi->lockList);
686 cifs_init_inodecache(void)
688 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
689 sizeof (struct cifsInodeInfo),
690 0, (SLAB_RECLAIM_ACCOUNT|
692 cifs_init_once, NULL);
693 if (cifs_inode_cachep == NULL)
700 cifs_destroy_inodecache(void)
702 kmem_cache_destroy(cifs_inode_cachep);
706 cifs_init_request_bufs(void)
708 if(CIFSMaxBufSize < 8192) {
709 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
710 Unicode path name has to fit in any SMB/CIFS path based frames */
711 CIFSMaxBufSize = 8192;
712 } else if (CIFSMaxBufSize > 1024*127) {
713 CIFSMaxBufSize = 1024 * 127;
715 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
717 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
718 cifs_req_cachep = kmem_cache_create("cifs_request",
720 MAX_CIFS_HDR_SIZE, 0,
721 SLAB_HWCACHE_ALIGN, NULL, NULL);
722 if (cifs_req_cachep == NULL)
727 else if (cifs_min_rcv > 64) {
729 cERROR(1,("cifs_min_rcv set to maximum (64)"));
732 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
735 if(cifs_req_poolp == NULL) {
736 kmem_cache_destroy(cifs_req_cachep);
739 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
740 almost all handle based requests (but not write response, nor is it
741 sufficient for path based requests). A smaller size would have
742 been more efficient (compacting multiple slab items on one 4k page)
743 for the case in which debug was on, but this larger size allows
744 more SMBs to use small buffer alloc and is still much more
745 efficient to alloc 1 per page off the slab compared to 17K (5page)
746 alloc of large cifs buffers even when page debugging is on */
747 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
748 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
750 if (cifs_sm_req_cachep == NULL) {
751 mempool_destroy(cifs_req_poolp);
752 kmem_cache_destroy(cifs_req_cachep);
756 if(cifs_min_small < 2)
758 else if (cifs_min_small > 256) {
759 cifs_min_small = 256;
760 cFYI(1,("cifs_min_small set to maximum (256)"));
763 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
766 if(cifs_sm_req_poolp == NULL) {
767 mempool_destroy(cifs_req_poolp);
768 kmem_cache_destroy(cifs_req_cachep);
769 kmem_cache_destroy(cifs_sm_req_cachep);
777 cifs_destroy_request_bufs(void)
779 mempool_destroy(cifs_req_poolp);
780 kmem_cache_destroy(cifs_req_cachep);
781 mempool_destroy(cifs_sm_req_poolp);
782 kmem_cache_destroy(cifs_sm_req_cachep);
788 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
789 sizeof (struct mid_q_entry), 0,
790 SLAB_HWCACHE_ALIGN, NULL, NULL);
791 if (cifs_mid_cachep == NULL)
794 /* 3 is a reasonable minimum number of simultaneous operations */
795 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
796 if(cifs_mid_poolp == NULL) {
797 kmem_cache_destroy(cifs_mid_cachep);
801 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
802 sizeof (struct oplock_q_entry), 0,
803 SLAB_HWCACHE_ALIGN, NULL, NULL);
804 if (cifs_oplock_cachep == NULL) {
805 kmem_cache_destroy(cifs_mid_cachep);
806 mempool_destroy(cifs_mid_poolp);
814 cifs_destroy_mids(void)
816 mempool_destroy(cifs_mid_poolp);
817 kmem_cache_destroy(cifs_mid_cachep);
818 kmem_cache_destroy(cifs_oplock_cachep);
821 static int cifs_oplock_thread(void * dummyarg)
823 struct oplock_q_entry * oplock_item;
824 struct cifsTconInfo *pTcon;
825 struct inode * inode;
833 spin_lock(&GlobalMid_Lock);
834 if(list_empty(&GlobalOplock_Q)) {
835 spin_unlock(&GlobalMid_Lock);
836 set_current_state(TASK_INTERRUPTIBLE);
837 schedule_timeout(39*HZ);
839 oplock_item = list_entry(GlobalOplock_Q.next,
840 struct oplock_q_entry, qhead);
842 cFYI(1,("found oplock item to write out"));
843 pTcon = oplock_item->tcon;
844 inode = oplock_item->pinode;
845 netfid = oplock_item->netfid;
846 spin_unlock(&GlobalMid_Lock);
847 DeleteOplockQEntry(oplock_item);
848 /* can not grab inode sem here since it would
849 deadlock when oplock received on delete
850 since vfs_unlink holds the i_mutex across
852 /* mutex_lock(&inode->i_mutex);*/
853 if (S_ISREG(inode->i_mode)) {
854 rc = filemap_fdatawrite(inode->i_mapping);
855 if(CIFS_I(inode)->clientCanCacheRead == 0) {
856 filemap_fdatawait(inode->i_mapping);
857 invalidate_remote_inode(inode);
861 /* mutex_unlock(&inode->i_mutex);*/
863 CIFS_I(inode)->write_behind_rc = rc;
864 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
866 /* releasing a stale oplock after recent reconnection
867 of smb session using a now incorrect file
868 handle is not a data integrity issue but do
869 not bother sending an oplock release if session
870 to server still is disconnected since oplock
871 already released by the server in that case */
872 if(pTcon->tidStatus != CifsNeedReconnect) {
873 rc = CIFSSMBLock(0, pTcon, netfid,
874 0 /* len */ , 0 /* offset */, 0,
875 0, LOCKING_ANDX_OPLOCK_RELEASE,
877 cFYI(1,("Oplock release rc = %d ",rc));
880 spin_unlock(&GlobalMid_Lock);
881 set_current_state(TASK_INTERRUPTIBLE);
882 schedule_timeout(1); /* yield in case q were corrupt */
884 } while (!kthread_should_stop());
889 static int cifs_dnotify_thread(void * dummyarg)
891 struct list_head *tmp;
892 struct cifsSesInfo *ses;
897 set_current_state(TASK_INTERRUPTIBLE);
898 schedule_timeout(15*HZ);
899 read_lock(&GlobalSMBSeslock);
900 /* check if any stuck requests that need
901 to be woken up and wakeq so the
902 thread can wake up and error out */
903 list_for_each(tmp, &GlobalSMBSessionList) {
904 ses = list_entry(tmp, struct cifsSesInfo,
906 if(ses && ses->server &&
907 atomic_read(&ses->server->inFlight))
908 wake_up_all(&ses->server->response_q);
910 read_unlock(&GlobalSMBSeslock);
911 } while (!kthread_should_stop());
920 #ifdef CONFIG_PROC_FS
923 INIT_LIST_HEAD(&GlobalServerList); /* BB not implemented yet */
924 INIT_LIST_HEAD(&GlobalSMBSessionList);
925 INIT_LIST_HEAD(&GlobalTreeConnectionList);
926 INIT_LIST_HEAD(&GlobalOplock_Q);
927 #ifdef CONFIG_CIFS_EXPERIMENTAL
928 INIT_LIST_HEAD(&GlobalDnotifyReqList);
929 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
932 * Initialize Global counters
934 atomic_set(&sesInfoAllocCount, 0);
935 atomic_set(&tconInfoAllocCount, 0);
936 atomic_set(&tcpSesAllocCount,0);
937 atomic_set(&tcpSesReconnectCount, 0);
938 atomic_set(&tconInfoReconnectCount, 0);
940 atomic_set(&bufAllocCount, 0);
941 atomic_set(&smBufAllocCount, 0);
942 #ifdef CONFIG_CIFS_STATS2
943 atomic_set(&totBufAllocCount, 0);
944 atomic_set(&totSmBufAllocCount, 0);
945 #endif /* CONFIG_CIFS_STATS2 */
947 atomic_set(&midCount, 0);
948 GlobalCurrentXid = 0;
949 GlobalTotalActiveXid = 0;
950 GlobalMaxActiveXid = 0;
951 rwlock_init(&GlobalSMBSeslock);
952 spin_lock_init(&GlobalMid_Lock);
954 if(cifs_max_pending < 2) {
955 cifs_max_pending = 2;
956 cFYI(1,("cifs_max_pending set to min of 2"));
957 } else if(cifs_max_pending > 256) {
958 cifs_max_pending = 256;
959 cFYI(1,("cifs_max_pending set to max of 256"));
962 rc = cifs_init_inodecache();
966 rc = cifs_init_mids();
968 goto out_destroy_inodecache;
970 rc = cifs_init_request_bufs();
972 goto out_destroy_mids;
974 rc = register_filesystem(&cifs_fs_type);
976 goto out_destroy_request_bufs;
978 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
979 if (IS_ERR(oplockThread)) {
980 rc = PTR_ERR(oplockThread);
981 cERROR(1,("error %d create oplock thread", rc));
982 goto out_unregister_filesystem;
985 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
986 if (IS_ERR(dnotifyThread)) {
987 rc = PTR_ERR(dnotifyThread);
988 cERROR(1,("error %d create dnotify thread", rc));
989 goto out_stop_oplock_thread;
994 out_stop_oplock_thread:
995 kthread_stop(oplockThread);
996 out_unregister_filesystem:
997 unregister_filesystem(&cifs_fs_type);
998 out_destroy_request_bufs:
999 cifs_destroy_request_bufs();
1001 cifs_destroy_mids();
1002 out_destroy_inodecache:
1003 cifs_destroy_inodecache();
1005 #ifdef CONFIG_PROC_FS
1014 cFYI(0, ("In unregister ie exit_cifs"));
1015 #ifdef CONFIG_PROC_FS
1018 unregister_filesystem(&cifs_fs_type);
1019 cifs_destroy_inodecache();
1020 cifs_destroy_mids();
1021 cifs_destroy_request_bufs();
1022 kthread_stop(oplockThread);
1023 kthread_stop(dnotifyThread);
1026 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1027 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1029 ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1030 MODULE_VERSION(CIFS_VERSION);
1031 module_init(init_cifs)
1032 module_exit(exit_cifs)