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 super_block *sb, struct kstatfs *buf)
172 int rc = -EOPNOTSUPP;
173 struct cifs_sb_info *cifs_sb;
174 struct cifsTconInfo *pTcon;
178 cifs_sb = CIFS_SB(sb);
179 pTcon = cifs_sb->tcon;
181 buf->f_type = CIFS_MAGIC_NUMBER;
183 /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
184 buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
185 presumably be total path, but note
186 that some servers (includinng Samba 3)
187 have a shorter maximum path */
188 buf->f_files = 0; /* undefined */
189 buf->f_ffree = 0; /* unlimited */
191 #ifdef CONFIG_CIFS_EXPERIMENTAL
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 #endif /* CIFS_EXPERIMENTAL */
202 rc = CIFSSMBQFSInfo(xid, pTcon, buf);
204 /* Old Windows servers do not support level 103, retry with level
205 one if old server failed the previous call */
207 rc = SMBOldQFSInfo(xid, pTcon, buf);
212 /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
214 return 0; /* always return success? what if volume is no
218 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
220 struct cifs_sb_info *cifs_sb;
222 cifs_sb = CIFS_SB(inode->i_sb);
224 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
226 } else /* file mode might have been restricted at mount time
227 on the client (above and beyond ACL on servers) for
228 servers which do not support setting and viewing mode bits,
229 so allowing client to check permissions is useful */
230 return generic_permission(inode, mask, NULL);
233 static kmem_cache_t *cifs_inode_cachep;
234 static kmem_cache_t *cifs_req_cachep;
235 static kmem_cache_t *cifs_mid_cachep;
236 kmem_cache_t *cifs_oplock_cachep;
237 static kmem_cache_t *cifs_sm_req_cachep;
238 mempool_t *cifs_sm_req_poolp;
239 mempool_t *cifs_req_poolp;
240 mempool_t *cifs_mid_poolp;
242 static struct inode *
243 cifs_alloc_inode(struct super_block *sb)
245 struct cifsInodeInfo *cifs_inode;
246 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
249 cifs_inode->cifsAttrs = 0x20; /* default */
250 atomic_set(&cifs_inode->inUse, 0);
251 cifs_inode->time = 0;
252 /* Until the file is open and we have gotten oplock
253 info back from the server, can not assume caching of
254 file data or metadata */
255 cifs_inode->clientCanCacheRead = FALSE;
256 cifs_inode->clientCanCacheAll = FALSE;
257 cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
258 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
259 cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
260 INIT_LIST_HEAD(&cifs_inode->openFileList);
261 return &cifs_inode->vfs_inode;
265 cifs_destroy_inode(struct inode *inode)
267 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
271 * cifs_show_options() is for displaying mount options in /proc/mounts.
272 * Not all settable options are displayed but most of the important
276 cifs_show_options(struct seq_file *s, struct vfsmount *m)
278 struct cifs_sb_info *cifs_sb;
280 cifs_sb = CIFS_SB(m->mnt_sb);
284 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
285 if (cifs_sb->tcon->ses) {
286 if (cifs_sb->tcon->ses->userName)
287 seq_printf(s, ",username=%s",
288 cifs_sb->tcon->ses->userName);
289 if(cifs_sb->tcon->ses->domainName)
290 seq_printf(s, ",domain=%s",
291 cifs_sb->tcon->ses->domainName);
294 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
295 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
300 #ifdef CONFIG_CIFS_QUOTA
301 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
302 struct fs_disk_quota * pdquota)
306 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
307 struct cifsTconInfo *pTcon;
310 pTcon = cifs_sb->tcon;
317 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
326 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
327 struct fs_disk_quota * pdquota)
331 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
332 struct cifsTconInfo *pTcon;
335 pTcon = cifs_sb->tcon;
341 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
350 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
354 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
355 struct cifsTconInfo *pTcon;
358 pTcon = cifs_sb->tcon;
364 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
373 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
377 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
378 struct cifsTconInfo *pTcon;
381 pTcon = cifs_sb->tcon;
387 cFYI(1,("pqstats %p",qstats));
396 static struct quotactl_ops cifs_quotactl_ops = {
397 .set_xquota = cifs_xquota_set,
398 .get_xquota = cifs_xquota_set,
399 .set_xstate = cifs_xstate_set,
400 .get_xstate = cifs_xstate_get,
404 #ifdef CONFIG_CIFS_EXPERIMENTAL
405 static void cifs_umount_begin(struct super_block * sblock)
407 struct cifs_sb_info *cifs_sb;
408 struct cifsTconInfo * tcon;
410 cifs_sb = CIFS_SB(sblock);
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); */
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 */
440 static int cifs_remount(struct super_block *sb, int *flags, char *data)
442 *flags |= MS_NODIRATIME;
446 struct super_operations cifs_super_ops = {
447 .read_inode = cifs_read_inode,
448 .put_super = cifs_put_super,
449 .statfs = cifs_statfs,
450 .alloc_inode = cifs_alloc_inode,
451 .destroy_inode = cifs_destroy_inode,
452 /* .drop_inode = generic_delete_inode,
453 .delete_inode = cifs_delete_inode, *//* Do not need the above two functions
454 unless later we add lazy close of inodes or unless the kernel forgets to call
455 us with the same number of releases (closes) as opens */
456 .show_options = cifs_show_options,
457 #ifdef CONFIG_CIFS_EXPERIMENTAL
458 .umount_begin = cifs_umount_begin,
460 .remount_fs = cifs_remount,
463 static struct super_block *
464 cifs_get_sb(struct file_system_type *fs_type,
465 int flags, const char *dev_name, void *data)
468 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
470 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
477 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
479 up_write(&sb->s_umount);
480 deactivate_super(sb);
483 sb->s_flags |= MS_ACTIVE;
487 static ssize_t cifs_file_writev(struct file *file, const struct iovec *iov,
488 unsigned long nr_segs, loff_t *ppos)
490 struct inode *inode = file->f_dentry->d_inode;
493 written = generic_file_writev(file, iov, nr_segs, ppos);
494 if (!CIFS_I(inode)->clientCanCacheAll)
495 filemap_fdatawrite(inode->i_mapping);
499 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
500 size_t count, loff_t pos)
502 struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
505 written = generic_file_aio_write(iocb, buf, count, pos);
506 if (!CIFS_I(inode)->clientCanCacheAll)
507 filemap_fdatawrite(inode->i_mapping);
511 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
513 /* origin == SEEK_END => we must revalidate the cached file length */
515 int retval = cifs_revalidate(file->f_dentry);
517 return (loff_t)retval;
519 return remote_llseek(file, offset, origin);
522 static struct file_system_type cifs_fs_type = {
523 .owner = THIS_MODULE,
525 .get_sb = cifs_get_sb,
526 .kill_sb = kill_anon_super,
529 struct inode_operations cifs_dir_inode_ops = {
530 .create = cifs_create,
531 .lookup = cifs_lookup,
532 .getattr = cifs_getattr,
533 .unlink = cifs_unlink,
534 .link = cifs_hardlink,
537 .rename = cifs_rename,
538 .permission = cifs_permission,
539 /* revalidate:cifs_revalidate, */
540 .setattr = cifs_setattr,
541 .symlink = cifs_symlink,
543 #ifdef CONFIG_CIFS_XATTR
544 .setxattr = cifs_setxattr,
545 .getxattr = cifs_getxattr,
546 .listxattr = cifs_listxattr,
547 .removexattr = cifs_removexattr,
551 struct inode_operations cifs_file_inode_ops = {
552 /* revalidate:cifs_revalidate, */
553 .setattr = cifs_setattr,
554 .getattr = cifs_getattr, /* do we need this anymore? */
555 .rename = cifs_rename,
556 .permission = cifs_permission,
557 #ifdef CONFIG_CIFS_XATTR
558 .setxattr = cifs_setxattr,
559 .getxattr = cifs_getxattr,
560 .listxattr = cifs_listxattr,
561 .removexattr = cifs_removexattr,
565 struct inode_operations cifs_symlink_inode_ops = {
566 .readlink = generic_readlink,
567 .follow_link = cifs_follow_link,
568 .put_link = cifs_put_link,
569 .permission = cifs_permission,
570 /* BB add the following two eventually */
571 /* revalidate: cifs_revalidate,
572 setattr: cifs_notify_change, *//* BB do we need notify change */
573 #ifdef CONFIG_CIFS_XATTR
574 .setxattr = cifs_setxattr,
575 .getxattr = cifs_getxattr,
576 .listxattr = cifs_listxattr,
577 .removexattr = cifs_removexattr,
581 const struct file_operations cifs_file_ops = {
582 .read = do_sync_read,
583 .write = do_sync_write,
584 .readv = generic_file_readv,
585 .writev = cifs_file_writev,
586 .aio_read = generic_file_aio_read,
587 .aio_write = cifs_file_aio_write,
589 .release = cifs_close,
593 .mmap = cifs_file_mmap,
594 .sendfile = generic_file_sendfile,
595 .llseek = cifs_llseek,
596 #ifdef CONFIG_CIFS_POSIX
598 #endif /* CONFIG_CIFS_POSIX */
600 #ifdef CONFIG_CIFS_EXPERIMENTAL
601 .dir_notify = cifs_dir_notify,
602 #endif /* CONFIG_CIFS_EXPERIMENTAL */
605 const struct file_operations cifs_file_direct_ops = {
606 /* no mmap, no aio, no readv -
607 BB reevaluate whether they can be done with directio, no cache */
608 .read = cifs_user_read,
609 .write = cifs_user_write,
611 .release = cifs_close,
615 .sendfile = generic_file_sendfile, /* BB removeme BB */
616 #ifdef CONFIG_CIFS_POSIX
618 #endif /* CONFIG_CIFS_POSIX */
619 .llseek = cifs_llseek,
620 #ifdef CONFIG_CIFS_EXPERIMENTAL
621 .dir_notify = cifs_dir_notify,
622 #endif /* CONFIG_CIFS_EXPERIMENTAL */
624 const struct file_operations cifs_file_nobrl_ops = {
625 .read = do_sync_read,
626 .write = do_sync_write,
627 .readv = generic_file_readv,
628 .writev = cifs_file_writev,
629 .aio_read = generic_file_aio_read,
630 .aio_write = cifs_file_aio_write,
632 .release = cifs_close,
635 .mmap = cifs_file_mmap,
636 .sendfile = generic_file_sendfile,
637 .llseek = cifs_llseek,
638 #ifdef CONFIG_CIFS_POSIX
640 #endif /* CONFIG_CIFS_POSIX */
642 #ifdef CONFIG_CIFS_EXPERIMENTAL
643 .dir_notify = cifs_dir_notify,
644 #endif /* CONFIG_CIFS_EXPERIMENTAL */
647 const struct file_operations cifs_file_direct_nobrl_ops = {
648 /* no mmap, no aio, no readv -
649 BB reevaluate whether they can be done with directio, no cache */
650 .read = cifs_user_read,
651 .write = cifs_user_write,
653 .release = cifs_close,
656 .sendfile = generic_file_sendfile, /* BB removeme BB */
657 #ifdef CONFIG_CIFS_POSIX
659 #endif /* CONFIG_CIFS_POSIX */
660 .llseek = cifs_llseek,
661 #ifdef CONFIG_CIFS_EXPERIMENTAL
662 .dir_notify = cifs_dir_notify,
663 #endif /* CONFIG_CIFS_EXPERIMENTAL */
666 const struct file_operations cifs_dir_ops = {
667 .readdir = cifs_readdir,
668 .release = cifs_closedir,
669 .read = generic_read_dir,
670 #ifdef CONFIG_CIFS_EXPERIMENTAL
671 .dir_notify = cifs_dir_notify,
672 #endif /* CONFIG_CIFS_EXPERIMENTAL */
677 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
679 struct cifsInodeInfo *cifsi = inode;
681 if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
682 SLAB_CTOR_CONSTRUCTOR) {
683 inode_init_once(&cifsi->vfs_inode);
684 INIT_LIST_HEAD(&cifsi->lockList);
689 cifs_init_inodecache(void)
691 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
692 sizeof (struct cifsInodeInfo),
693 0, (SLAB_RECLAIM_ACCOUNT|
695 cifs_init_once, NULL);
696 if (cifs_inode_cachep == NULL)
703 cifs_destroy_inodecache(void)
705 if (kmem_cache_destroy(cifs_inode_cachep))
706 printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
710 cifs_init_request_bufs(void)
712 if(CIFSMaxBufSize < 8192) {
713 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
714 Unicode path name has to fit in any SMB/CIFS path based frames */
715 CIFSMaxBufSize = 8192;
716 } else if (CIFSMaxBufSize > 1024*127) {
717 CIFSMaxBufSize = 1024 * 127;
719 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
721 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
722 cifs_req_cachep = kmem_cache_create("cifs_request",
724 MAX_CIFS_HDR_SIZE, 0,
725 SLAB_HWCACHE_ALIGN, NULL, NULL);
726 if (cifs_req_cachep == NULL)
731 else if (cifs_min_rcv > 64) {
733 cERROR(1,("cifs_min_rcv set to maximum (64)"));
736 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
739 if(cifs_req_poolp == NULL) {
740 kmem_cache_destroy(cifs_req_cachep);
743 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
744 almost all handle based requests (but not write response, nor is it
745 sufficient for path based requests). A smaller size would have
746 been more efficient (compacting multiple slab items on one 4k page)
747 for the case in which debug was on, but this larger size allows
748 more SMBs to use small buffer alloc and is still much more
749 efficient to alloc 1 per page off the slab compared to 17K (5page)
750 alloc of large cifs buffers even when page debugging is on */
751 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
752 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
754 if (cifs_sm_req_cachep == NULL) {
755 mempool_destroy(cifs_req_poolp);
756 kmem_cache_destroy(cifs_req_cachep);
760 if(cifs_min_small < 2)
762 else if (cifs_min_small > 256) {
763 cifs_min_small = 256;
764 cFYI(1,("cifs_min_small set to maximum (256)"));
767 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
770 if(cifs_sm_req_poolp == NULL) {
771 mempool_destroy(cifs_req_poolp);
772 kmem_cache_destroy(cifs_req_cachep);
773 kmem_cache_destroy(cifs_sm_req_cachep);
781 cifs_destroy_request_bufs(void)
783 mempool_destroy(cifs_req_poolp);
784 if (kmem_cache_destroy(cifs_req_cachep))
786 "cifs_destroy_request_cache: error not all structures were freed\n");
787 mempool_destroy(cifs_sm_req_poolp);
788 if (kmem_cache_destroy(cifs_sm_req_cachep))
790 "cifs_destroy_request_cache: cifs_small_rq free error\n");
796 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
797 sizeof (struct mid_q_entry), 0,
798 SLAB_HWCACHE_ALIGN, NULL, NULL);
799 if (cifs_mid_cachep == NULL)
802 /* 3 is a reasonable minimum number of simultaneous operations */
803 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
804 if(cifs_mid_poolp == NULL) {
805 kmem_cache_destroy(cifs_mid_cachep);
809 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
810 sizeof (struct oplock_q_entry), 0,
811 SLAB_HWCACHE_ALIGN, NULL, NULL);
812 if (cifs_oplock_cachep == NULL) {
813 kmem_cache_destroy(cifs_mid_cachep);
814 mempool_destroy(cifs_mid_poolp);
822 cifs_destroy_mids(void)
824 mempool_destroy(cifs_mid_poolp);
825 if (kmem_cache_destroy(cifs_mid_cachep))
827 "cifs_destroy_mids: error not all structures were freed\n");
829 if (kmem_cache_destroy(cifs_oplock_cachep))
831 "error not all oplock structures were freed\n");
834 static int cifs_oplock_thread(void * dummyarg)
836 struct oplock_q_entry * oplock_item;
837 struct cifsTconInfo *pTcon;
838 struct inode * inode;
846 spin_lock(&GlobalMid_Lock);
847 if(list_empty(&GlobalOplock_Q)) {
848 spin_unlock(&GlobalMid_Lock);
849 set_current_state(TASK_INTERRUPTIBLE);
850 schedule_timeout(39*HZ);
852 oplock_item = list_entry(GlobalOplock_Q.next,
853 struct oplock_q_entry, qhead);
855 cFYI(1,("found oplock item to write out"));
856 pTcon = oplock_item->tcon;
857 inode = oplock_item->pinode;
858 netfid = oplock_item->netfid;
859 spin_unlock(&GlobalMid_Lock);
860 DeleteOplockQEntry(oplock_item);
861 /* can not grab inode sem here since it would
862 deadlock when oplock received on delete
863 since vfs_unlink holds the i_mutex across
865 /* mutex_lock(&inode->i_mutex);*/
866 if (S_ISREG(inode->i_mode)) {
867 rc = filemap_fdatawrite(inode->i_mapping);
868 if(CIFS_I(inode)->clientCanCacheRead == 0) {
869 filemap_fdatawait(inode->i_mapping);
870 invalidate_remote_inode(inode);
874 /* mutex_unlock(&inode->i_mutex);*/
876 CIFS_I(inode)->write_behind_rc = rc;
877 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
879 /* releasing a stale oplock after recent reconnection
880 of smb session using a now incorrect file
881 handle is not a data integrity issue but do
882 not bother sending an oplock release if session
883 to server still is disconnected since oplock
884 already released by the server in that case */
885 if(pTcon->tidStatus != CifsNeedReconnect) {
886 rc = CIFSSMBLock(0, pTcon, netfid,
887 0 /* len */ , 0 /* offset */, 0,
888 0, LOCKING_ANDX_OPLOCK_RELEASE,
890 cFYI(1,("Oplock release rc = %d ",rc));
893 spin_unlock(&GlobalMid_Lock);
894 set_current_state(TASK_INTERRUPTIBLE);
895 schedule_timeout(1); /* yield in case q were corrupt */
897 } while (!kthread_should_stop());
902 static int cifs_dnotify_thread(void * dummyarg)
904 struct list_head *tmp;
905 struct cifsSesInfo *ses;
910 set_current_state(TASK_INTERRUPTIBLE);
911 schedule_timeout(15*HZ);
912 read_lock(&GlobalSMBSeslock);
913 /* check if any stuck requests that need
914 to be woken up and wakeq so the
915 thread can wake up and error out */
916 list_for_each(tmp, &GlobalSMBSessionList) {
917 ses = list_entry(tmp, struct cifsSesInfo,
919 if(ses && ses->server &&
920 atomic_read(&ses->server->inFlight))
921 wake_up_all(&ses->server->response_q);
923 read_unlock(&GlobalSMBSeslock);
924 } while (!kthread_should_stop());
933 #ifdef CONFIG_PROC_FS
936 INIT_LIST_HEAD(&GlobalServerList); /* BB not implemented yet */
937 INIT_LIST_HEAD(&GlobalSMBSessionList);
938 INIT_LIST_HEAD(&GlobalTreeConnectionList);
939 INIT_LIST_HEAD(&GlobalOplock_Q);
940 #ifdef CONFIG_CIFS_EXPERIMENTAL
941 INIT_LIST_HEAD(&GlobalDnotifyReqList);
942 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
945 * Initialize Global counters
947 atomic_set(&sesInfoAllocCount, 0);
948 atomic_set(&tconInfoAllocCount, 0);
949 atomic_set(&tcpSesAllocCount,0);
950 atomic_set(&tcpSesReconnectCount, 0);
951 atomic_set(&tconInfoReconnectCount, 0);
953 atomic_set(&bufAllocCount, 0);
954 atomic_set(&smBufAllocCount, 0);
955 #ifdef CONFIG_CIFS_STATS2
956 atomic_set(&totBufAllocCount, 0);
957 atomic_set(&totSmBufAllocCount, 0);
958 #endif /* CONFIG_CIFS_STATS2 */
960 atomic_set(&midCount, 0);
961 GlobalCurrentXid = 0;
962 GlobalTotalActiveXid = 0;
963 GlobalMaxActiveXid = 0;
964 rwlock_init(&GlobalSMBSeslock);
965 spin_lock_init(&GlobalMid_Lock);
967 if(cifs_max_pending < 2) {
968 cifs_max_pending = 2;
969 cFYI(1,("cifs_max_pending set to min of 2"));
970 } else if(cifs_max_pending > 256) {
971 cifs_max_pending = 256;
972 cFYI(1,("cifs_max_pending set to max of 256"));
975 rc = cifs_init_inodecache();
979 rc = cifs_init_mids();
981 goto out_destroy_inodecache;
983 rc = cifs_init_request_bufs();
985 goto out_destroy_mids;
987 rc = register_filesystem(&cifs_fs_type);
989 goto out_destroy_request_bufs;
991 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
992 if (IS_ERR(oplockThread)) {
993 rc = PTR_ERR(oplockThread);
994 cERROR(1,("error %d create oplock thread", rc));
995 goto out_unregister_filesystem;
998 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
999 if (IS_ERR(dnotifyThread)) {
1000 rc = PTR_ERR(dnotifyThread);
1001 cERROR(1,("error %d create dnotify thread", rc));
1002 goto out_stop_oplock_thread;
1007 out_stop_oplock_thread:
1008 kthread_stop(oplockThread);
1009 out_unregister_filesystem:
1010 unregister_filesystem(&cifs_fs_type);
1011 out_destroy_request_bufs:
1012 cifs_destroy_request_bufs();
1014 cifs_destroy_mids();
1015 out_destroy_inodecache:
1016 cifs_destroy_inodecache();
1018 #ifdef CONFIG_PROC_FS
1027 cFYI(0, ("In unregister ie exit_cifs"));
1028 #ifdef CONFIG_PROC_FS
1031 unregister_filesystem(&cifs_fs_type);
1032 cifs_destroy_inodecache();
1033 cifs_destroy_mids();
1034 cifs_destroy_request_bufs();
1035 kthread_stop(oplockThread);
1036 kthread_stop(dnotifyThread);
1039 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1040 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1042 ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1043 MODULE_VERSION(CIFS_VERSION);
1044 module_init(init_cifs)
1045 module_exit(exit_cifs)