4 * Copyright (C) International Business Machines Corp., 2002,2007
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Common Internet FileSystem (CIFS) client
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 /* Note that BB means BUGBUG (ie something to fix eventually) */
26 #include <linux/module.h>
28 #include <linux/mount.h>
29 #include <linux/slab.h>
30 #include <linux/init.h>
31 #include <linux/list.h>
32 #include <linux/seq_file.h>
33 #include <linux/vfs.h>
34 #include <linux/mempool.h>
35 #include <linux/delay.h>
36 #include <linux/kthread.h>
37 #include <linux/freezer.h>
40 #define DECLARE_GLOBALS_HERE
42 #include "cifsproto.h"
43 #include "cifs_debug.h"
44 #include "cifs_fs_sb.h"
46 #include <linux/key-type.h>
47 #include "dns_resolve.h"
48 #include "cifs_spnego.h"
49 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
51 #ifdef CONFIG_CIFS_QUOTA
52 static struct quotactl_ops cifs_quotactl_ops;
58 unsigned int oplockEnabled = 1;
59 unsigned int experimEnabled = 0;
60 unsigned int linuxExtEnabled = 1;
61 unsigned int lookupCacheEnabled = 1;
62 unsigned int multiuser_mount = 0;
63 unsigned int extended_security = CIFSSEC_DEF;
64 /* unsigned int ntlmv2_support = 0; */
65 unsigned int sign_CIFS_PDUs = 1;
66 extern struct task_struct *oplockThread; /* remove sparse warning */
67 struct task_struct *oplockThread = NULL;
68 /* extern struct task_struct * dnotifyThread; remove sparse warning */
69 static struct task_struct *dnotifyThread = NULL;
70 static const struct super_operations cifs_super_ops;
71 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
72 module_param(CIFSMaxBufSize, int, 0);
73 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
74 "Default: 16384 Range: 8192 to 130048");
75 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
76 module_param(cifs_min_rcv, int, 0);
77 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
79 unsigned int cifs_min_small = 30;
80 module_param(cifs_min_small, int, 0);
81 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
83 unsigned int cifs_max_pending = CIFS_MAX_REQ;
84 module_param(cifs_max_pending, int, 0);
85 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
86 "Default: 50 Range: 2 to 256");
88 extern mempool_t *cifs_sm_req_poolp;
89 extern mempool_t *cifs_req_poolp;
90 extern mempool_t *cifs_mid_poolp;
92 extern struct kmem_cache *cifs_oplock_cachep;
95 cifs_read_super(struct super_block *sb, void *data,
96 const char *devname, int silent)
99 struct cifs_sb_info *cifs_sb;
100 #ifdef CONFIG_CIFS_DFS_UPCALL
105 /* BB should we make this contingent on mount parm? */
106 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
107 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
108 cifs_sb = CIFS_SB(sb);
112 #ifdef CONFIG_CIFS_DFS_UPCALL
113 /* copy mount params to sb for use in submounts */
114 /* BB: should we move this after the mount so we
115 * do not have to do the copy on failed mounts?
116 * BB: May be it is better to do simple copy before
117 * complex operation (mount), and in case of fail
118 * just exit instead of doing mount and attempting
119 * undo it if this copy fails?*/
121 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
122 if (cifs_sb->mountdata == NULL) {
123 kfree(sb->s_fs_info);
124 sb->s_fs_info = NULL;
127 strncpy(cifs_sb->mountdata, data, len + 1);
128 cifs_sb->mountdata[len] = '\0';
131 rc = cifs_mount(sb, cifs_sb, data, devname);
136 ("cifs_mount failed w/return code = %d", rc));
137 goto out_mount_failed;
140 sb->s_magic = CIFS_MAGIC_NUMBER;
141 sb->s_op = &cifs_super_ops;
142 /* if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
144 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
145 #ifdef CONFIG_CIFS_QUOTA
146 sb->s_qcop = &cifs_quotactl_ops;
148 sb->s_blocksize = CIFS_MAX_MSGSIZE;
149 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
150 inode = cifs_iget(sb, ROOT_I);
158 sb->s_root = d_alloc_root(inode);
165 #ifdef CONFIG_CIFS_EXPERIMENTAL
166 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
167 cFYI(1, ("export ops supported"));
168 sb->s_export_op = &cifs_export_ops;
170 #endif /* EXPERIMENTAL */
175 cERROR(1, ("cifs_read_super: get root inode failed"));
181 #ifdef CONFIG_CIFS_DFS_UPCALL
182 if (cifs_sb->mountdata) {
183 kfree(cifs_sb->mountdata);
184 cifs_sb->mountdata = NULL;
187 if (cifs_sb->local_nls)
188 unload_nls(cifs_sb->local_nls);
195 cifs_put_super(struct super_block *sb)
198 struct cifs_sb_info *cifs_sb;
200 cFYI(1, ("In cifs_put_super"));
201 cifs_sb = CIFS_SB(sb);
202 if (cifs_sb == NULL) {
203 cFYI(1, ("Empty cifs superblock info passed to unmount"));
206 rc = cifs_umount(sb, cifs_sb);
208 cERROR(1, ("cifs_umount failed with return code %d", rc));
209 #ifdef CONFIG_CIFS_DFS_UPCALL
210 if (cifs_sb->mountdata) {
211 kfree(cifs_sb->mountdata);
212 cifs_sb->mountdata = NULL;
216 unload_nls(cifs_sb->local_nls);
222 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
224 struct super_block *sb = dentry->d_sb;
225 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
226 struct cifsTconInfo *tcon = cifs_sb->tcon;
227 int rc = -EOPNOTSUPP;
232 buf->f_type = CIFS_MAGIC_NUMBER;
235 * PATH_MAX may be too long - it would presumably be total path,
236 * but note that some servers (includinng Samba 3) have a shorter
239 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
241 buf->f_namelen = PATH_MAX;
242 buf->f_files = 0; /* undefined */
243 buf->f_ffree = 0; /* unlimited */
246 * We could add a second check for a QFS Unix capability bit
248 if ((tcon->ses->capabilities & CAP_UNIX) &&
249 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
250 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
253 * Only need to call the old QFSInfo if failed on newer one,
256 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
257 rc = CIFSSMBQFSInfo(xid, tcon, buf);
260 * Some old Windows servers also do not support level 103, retry with
261 * older level one if old server failed the previous call or we
262 * bypassed it because we detected that this was an older LANMAN sess
265 rc = SMBOldQFSInfo(xid, tcon, buf);
271 static int cifs_permission(struct inode *inode, int mask, struct nameidata *nd)
273 struct cifs_sb_info *cifs_sb;
275 cifs_sb = CIFS_SB(inode->i_sb);
277 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
279 else /* file mode might have been restricted at mount time
280 on the client (above and beyond ACL on servers) for
281 servers which do not support setting and viewing mode bits,
282 so allowing client to check permissions is useful */
283 return generic_permission(inode, mask, NULL);
286 static struct kmem_cache *cifs_inode_cachep;
287 static struct kmem_cache *cifs_req_cachep;
288 static struct kmem_cache *cifs_mid_cachep;
289 struct kmem_cache *cifs_oplock_cachep;
290 static struct kmem_cache *cifs_sm_req_cachep;
291 mempool_t *cifs_sm_req_poolp;
292 mempool_t *cifs_req_poolp;
293 mempool_t *cifs_mid_poolp;
295 static struct inode *
296 cifs_alloc_inode(struct super_block *sb)
298 struct cifsInodeInfo *cifs_inode;
299 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
302 cifs_inode->cifsAttrs = 0x20; /* default */
303 atomic_set(&cifs_inode->inUse, 0);
304 cifs_inode->time = 0;
305 cifs_inode->write_behind_rc = 0;
306 /* Until the file is open and we have gotten oplock
307 info back from the server, can not assume caching of
308 file data or metadata */
309 cifs_inode->clientCanCacheRead = false;
310 cifs_inode->clientCanCacheAll = false;
311 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
313 /* Can not set i_flags here - they get immediately overwritten
314 to zero by the VFS */
315 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
316 INIT_LIST_HEAD(&cifs_inode->openFileList);
317 return &cifs_inode->vfs_inode;
321 cifs_destroy_inode(struct inode *inode)
323 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
327 * cifs_show_options() is for displaying mount options in /proc/mounts.
328 * Not all settable options are displayed but most of the important
332 cifs_show_options(struct seq_file *s, struct vfsmount *m)
334 struct cifs_sb_info *cifs_sb;
336 cifs_sb = CIFS_SB(m->mnt_sb);
340 /* BB add prepath to mount options displayed */
341 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
342 if (cifs_sb->tcon->ses) {
343 if (cifs_sb->tcon->ses->userName)
344 seq_printf(s, ",username=%s",
345 cifs_sb->tcon->ses->userName);
346 if (cifs_sb->tcon->ses->domainName)
347 seq_printf(s, ",domain=%s",
348 cifs_sb->tcon->ses->domainName);
350 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
351 !(cifs_sb->tcon->unix_ext))
352 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
353 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
354 !(cifs_sb->tcon->unix_ext))
355 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
357 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
358 seq_printf(s, ",posixpaths");
359 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
360 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
365 #ifdef CONFIG_CIFS_QUOTA
366 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
367 struct fs_disk_quota *pdquota)
371 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
372 struct cifsTconInfo *pTcon;
375 pTcon = cifs_sb->tcon;
382 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
391 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
392 struct fs_disk_quota *pdquota)
396 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
397 struct cifsTconInfo *pTcon;
400 pTcon = cifs_sb->tcon;
406 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
415 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
419 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
420 struct cifsTconInfo *pTcon;
423 pTcon = cifs_sb->tcon;
429 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
438 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
442 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
443 struct cifsTconInfo *pTcon;
446 pTcon = cifs_sb->tcon;
452 cFYI(1, ("pqstats %p", qstats));
461 static struct quotactl_ops cifs_quotactl_ops = {
462 .set_xquota = cifs_xquota_set,
463 .get_xquota = cifs_xquota_get,
464 .set_xstate = cifs_xstate_set,
465 .get_xstate = cifs_xstate_get,
469 static void cifs_umount_begin(struct super_block *sb)
471 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
472 struct cifsTconInfo *tcon;
477 tcon = cifs_sb->tcon;
480 down(&tcon->tconSem);
481 if (atomic_read(&tcon->useCount) == 1)
482 tcon->tidStatus = CifsExiting;
485 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
486 /* cancel_notify_requests(tcon); */
487 if (tcon->ses && tcon->ses->server) {
488 cFYI(1, ("wake up tasks now - umount begin not complete"));
489 wake_up_all(&tcon->ses->server->request_q);
490 wake_up_all(&tcon->ses->server->response_q);
491 msleep(1); /* yield */
492 /* we have to kick the requests once more */
493 wake_up_all(&tcon->ses->server->response_q);
496 /* BB FIXME - finish add checks for tidStatus BB */
501 #ifdef CONFIG_CIFS_STATS2
502 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
509 static int cifs_remount(struct super_block *sb, int *flags, char *data)
511 *flags |= MS_NODIRATIME;
515 static const struct super_operations cifs_super_ops = {
516 .put_super = cifs_put_super,
517 .statfs = cifs_statfs,
518 .alloc_inode = cifs_alloc_inode,
519 .destroy_inode = cifs_destroy_inode,
520 /* .drop_inode = generic_delete_inode,
521 .delete_inode = cifs_delete_inode, */ /* Do not need above two
522 functions unless later we add lazy close of inodes or unless the
523 kernel forgets to call us with the same number of releases (closes)
525 .show_options = cifs_show_options,
526 .umount_begin = cifs_umount_begin,
527 .remount_fs = cifs_remount,
528 #ifdef CONFIG_CIFS_STATS2
529 .show_stats = cifs_show_stats,
534 cifs_get_sb(struct file_system_type *fs_type,
535 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
538 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
540 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
547 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
549 up_write(&sb->s_umount);
550 deactivate_super(sb);
553 sb->s_flags |= MS_ACTIVE;
554 return simple_set_mnt(mnt, sb);
557 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
558 unsigned long nr_segs, loff_t pos)
560 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
563 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
564 if (!CIFS_I(inode)->clientCanCacheAll)
565 filemap_fdatawrite(inode->i_mapping);
569 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
571 /* origin == SEEK_END => we must revalidate the cached file length */
572 if (origin == SEEK_END) {
575 /* some applications poll for the file length in this strange
576 way so we must seek to end on non-oplocked files by
577 setting the revalidate time to zero */
578 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
580 retval = cifs_revalidate(file->f_path.dentry);
582 return (loff_t)retval;
584 return remote_llseek(file, offset, origin);
587 struct file_system_type cifs_fs_type = {
588 .owner = THIS_MODULE,
590 .get_sb = cifs_get_sb,
591 .kill_sb = kill_anon_super,
594 const struct inode_operations cifs_dir_inode_ops = {
595 .create = cifs_create,
596 .lookup = cifs_lookup,
597 .getattr = cifs_getattr,
598 .unlink = cifs_unlink,
599 .link = cifs_hardlink,
602 .rename = cifs_rename,
603 .permission = cifs_permission,
604 /* revalidate:cifs_revalidate, */
605 .setattr = cifs_setattr,
606 .symlink = cifs_symlink,
608 #ifdef CONFIG_CIFS_XATTR
609 .setxattr = cifs_setxattr,
610 .getxattr = cifs_getxattr,
611 .listxattr = cifs_listxattr,
612 .removexattr = cifs_removexattr,
616 const struct inode_operations cifs_file_inode_ops = {
617 /* revalidate:cifs_revalidate, */
618 .setattr = cifs_setattr,
619 .getattr = cifs_getattr, /* do we need this anymore? */
620 .rename = cifs_rename,
621 .permission = cifs_permission,
622 #ifdef CONFIG_CIFS_XATTR
623 .setxattr = cifs_setxattr,
624 .getxattr = cifs_getxattr,
625 .listxattr = cifs_listxattr,
626 .removexattr = cifs_removexattr,
630 const struct inode_operations cifs_symlink_inode_ops = {
631 .readlink = generic_readlink,
632 .follow_link = cifs_follow_link,
633 .put_link = cifs_put_link,
634 .permission = cifs_permission,
635 /* BB add the following two eventually */
636 /* revalidate: cifs_revalidate,
637 setattr: cifs_notify_change, *//* BB do we need notify change */
638 #ifdef CONFIG_CIFS_XATTR
639 .setxattr = cifs_setxattr,
640 .getxattr = cifs_getxattr,
641 .listxattr = cifs_listxattr,
642 .removexattr = cifs_removexattr,
646 const struct file_operations cifs_file_ops = {
647 .read = do_sync_read,
648 .write = do_sync_write,
649 .aio_read = generic_file_aio_read,
650 .aio_write = cifs_file_aio_write,
652 .release = cifs_close,
656 .mmap = cifs_file_mmap,
657 .splice_read = generic_file_splice_read,
658 .llseek = cifs_llseek,
659 #ifdef CONFIG_CIFS_POSIX
661 #endif /* CONFIG_CIFS_POSIX */
663 #ifdef CONFIG_CIFS_EXPERIMENTAL
664 .dir_notify = cifs_dir_notify,
665 #endif /* CONFIG_CIFS_EXPERIMENTAL */
668 const struct file_operations cifs_file_direct_ops = {
669 /* no mmap, no aio, no readv -
670 BB reevaluate whether they can be done with directio, no cache */
671 .read = cifs_user_read,
672 .write = cifs_user_write,
674 .release = cifs_close,
678 .splice_read = generic_file_splice_read,
679 #ifdef CONFIG_CIFS_POSIX
681 #endif /* CONFIG_CIFS_POSIX */
682 .llseek = cifs_llseek,
683 #ifdef CONFIG_CIFS_EXPERIMENTAL
684 .dir_notify = cifs_dir_notify,
685 #endif /* CONFIG_CIFS_EXPERIMENTAL */
687 const struct file_operations cifs_file_nobrl_ops = {
688 .read = do_sync_read,
689 .write = do_sync_write,
690 .aio_read = generic_file_aio_read,
691 .aio_write = cifs_file_aio_write,
693 .release = cifs_close,
696 .mmap = cifs_file_mmap,
697 .splice_read = generic_file_splice_read,
698 .llseek = cifs_llseek,
699 #ifdef CONFIG_CIFS_POSIX
701 #endif /* CONFIG_CIFS_POSIX */
703 #ifdef CONFIG_CIFS_EXPERIMENTAL
704 .dir_notify = cifs_dir_notify,
705 #endif /* CONFIG_CIFS_EXPERIMENTAL */
708 const struct file_operations cifs_file_direct_nobrl_ops = {
709 /* no mmap, no aio, no readv -
710 BB reevaluate whether they can be done with directio, no cache */
711 .read = cifs_user_read,
712 .write = cifs_user_write,
714 .release = cifs_close,
717 .splice_read = generic_file_splice_read,
718 #ifdef CONFIG_CIFS_POSIX
720 #endif /* CONFIG_CIFS_POSIX */
721 .llseek = cifs_llseek,
722 #ifdef CONFIG_CIFS_EXPERIMENTAL
723 .dir_notify = cifs_dir_notify,
724 #endif /* CONFIG_CIFS_EXPERIMENTAL */
727 const struct file_operations cifs_dir_ops = {
728 .readdir = cifs_readdir,
729 .release = cifs_closedir,
730 .read = generic_read_dir,
731 #ifdef CONFIG_CIFS_EXPERIMENTAL
732 .dir_notify = cifs_dir_notify,
733 #endif /* CONFIG_CIFS_EXPERIMENTAL */
738 cifs_init_once(struct kmem_cache *cachep, void *inode)
740 struct cifsInodeInfo *cifsi = inode;
742 inode_init_once(&cifsi->vfs_inode);
743 INIT_LIST_HEAD(&cifsi->lockList);
747 cifs_init_inodecache(void)
749 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
750 sizeof(struct cifsInodeInfo),
751 0, (SLAB_RECLAIM_ACCOUNT|
754 if (cifs_inode_cachep == NULL)
761 cifs_destroy_inodecache(void)
763 kmem_cache_destroy(cifs_inode_cachep);
767 cifs_init_request_bufs(void)
769 if (CIFSMaxBufSize < 8192) {
770 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
771 Unicode path name has to fit in any SMB/CIFS path based frames */
772 CIFSMaxBufSize = 8192;
773 } else if (CIFSMaxBufSize > 1024*127) {
774 CIFSMaxBufSize = 1024 * 127;
776 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
778 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
779 cifs_req_cachep = kmem_cache_create("cifs_request",
781 MAX_CIFS_HDR_SIZE, 0,
782 SLAB_HWCACHE_ALIGN, NULL);
783 if (cifs_req_cachep == NULL)
786 if (cifs_min_rcv < 1)
788 else if (cifs_min_rcv > 64) {
790 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
793 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
796 if (cifs_req_poolp == NULL) {
797 kmem_cache_destroy(cifs_req_cachep);
800 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
801 almost all handle based requests (but not write response, nor is it
802 sufficient for path based requests). A smaller size would have
803 been more efficient (compacting multiple slab items on one 4k page)
804 for the case in which debug was on, but this larger size allows
805 more SMBs to use small buffer alloc and is still much more
806 efficient to alloc 1 per page off the slab compared to 17K (5page)
807 alloc of large cifs buffers even when page debugging is on */
808 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
809 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
811 if (cifs_sm_req_cachep == NULL) {
812 mempool_destroy(cifs_req_poolp);
813 kmem_cache_destroy(cifs_req_cachep);
817 if (cifs_min_small < 2)
819 else if (cifs_min_small > 256) {
820 cifs_min_small = 256;
821 cFYI(1, ("cifs_min_small set to maximum (256)"));
824 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
827 if (cifs_sm_req_poolp == NULL) {
828 mempool_destroy(cifs_req_poolp);
829 kmem_cache_destroy(cifs_req_cachep);
830 kmem_cache_destroy(cifs_sm_req_cachep);
838 cifs_destroy_request_bufs(void)
840 mempool_destroy(cifs_req_poolp);
841 kmem_cache_destroy(cifs_req_cachep);
842 mempool_destroy(cifs_sm_req_poolp);
843 kmem_cache_destroy(cifs_sm_req_cachep);
849 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
850 sizeof(struct mid_q_entry), 0,
851 SLAB_HWCACHE_ALIGN, NULL);
852 if (cifs_mid_cachep == NULL)
855 /* 3 is a reasonable minimum number of simultaneous operations */
856 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
857 if (cifs_mid_poolp == NULL) {
858 kmem_cache_destroy(cifs_mid_cachep);
862 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
863 sizeof(struct oplock_q_entry), 0,
864 SLAB_HWCACHE_ALIGN, NULL);
865 if (cifs_oplock_cachep == NULL) {
866 mempool_destroy(cifs_mid_poolp);
867 kmem_cache_destroy(cifs_mid_cachep);
875 cifs_destroy_mids(void)
877 mempool_destroy(cifs_mid_poolp);
878 kmem_cache_destroy(cifs_mid_cachep);
879 kmem_cache_destroy(cifs_oplock_cachep);
882 static int cifs_oplock_thread(void *dummyarg)
884 struct oplock_q_entry *oplock_item;
885 struct cifsTconInfo *pTcon;
895 spin_lock(&GlobalMid_Lock);
896 if (list_empty(&GlobalOplock_Q)) {
897 spin_unlock(&GlobalMid_Lock);
898 set_current_state(TASK_INTERRUPTIBLE);
899 schedule_timeout(39*HZ);
901 oplock_item = list_entry(GlobalOplock_Q.next,
902 struct oplock_q_entry, qhead);
904 cFYI(1, ("found oplock item to write out"));
905 pTcon = oplock_item->tcon;
906 inode = oplock_item->pinode;
907 netfid = oplock_item->netfid;
908 spin_unlock(&GlobalMid_Lock);
909 DeleteOplockQEntry(oplock_item);
910 /* can not grab inode sem here since it would
911 deadlock when oplock received on delete
912 since vfs_unlink holds the i_mutex across
914 /* mutex_lock(&inode->i_mutex);*/
915 if (S_ISREG(inode->i_mode)) {
917 filemap_fdatawrite(inode->i_mapping);
918 if (CIFS_I(inode)->clientCanCacheRead
920 waitrc = filemap_fdatawait(inode->i_mapping);
921 invalidate_remote_inode(inode);
927 /* mutex_unlock(&inode->i_mutex);*/
929 CIFS_I(inode)->write_behind_rc = rc;
930 cFYI(1, ("Oplock flush inode %p rc %d",
933 /* releasing stale oplock after recent reconnect
934 of smb session using a now incorrect file
935 handle is not a data integrity issue but do
936 not bother sending an oplock release if session
937 to server still is disconnected since oplock
938 already released by the server in that case */
939 if (pTcon->tidStatus != CifsNeedReconnect) {
940 rc = CIFSSMBLock(0, pTcon, netfid,
941 0 /* len */ , 0 /* offset */, 0,
942 0, LOCKING_ANDX_OPLOCK_RELEASE,
943 false /* wait flag */);
944 cFYI(1, ("Oplock release rc = %d", rc));
947 spin_unlock(&GlobalMid_Lock);
948 set_current_state(TASK_INTERRUPTIBLE);
949 schedule_timeout(1); /* yield in case q were corrupt */
951 } while (!kthread_should_stop());
956 static int cifs_dnotify_thread(void *dummyarg)
958 struct list_head *tmp;
959 struct cifsSesInfo *ses;
964 set_current_state(TASK_INTERRUPTIBLE);
965 schedule_timeout(15*HZ);
966 read_lock(&GlobalSMBSeslock);
967 /* check if any stuck requests that need
968 to be woken up and wakeq so the
969 thread can wake up and error out */
970 list_for_each(tmp, &GlobalSMBSessionList) {
971 ses = list_entry(tmp, struct cifsSesInfo,
973 if (ses && ses->server &&
974 atomic_read(&ses->server->inFlight))
975 wake_up_all(&ses->server->response_q);
977 read_unlock(&GlobalSMBSeslock);
978 } while (!kthread_should_stop());
988 /* INIT_LIST_HEAD(&GlobalServerList);*/ /* BB not implemented yet */
989 INIT_LIST_HEAD(&GlobalSMBSessionList);
990 INIT_LIST_HEAD(&GlobalTreeConnectionList);
991 INIT_LIST_HEAD(&GlobalOplock_Q);
992 #ifdef CONFIG_CIFS_EXPERIMENTAL
993 INIT_LIST_HEAD(&GlobalDnotifyReqList);
994 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
997 * Initialize Global counters
999 atomic_set(&sesInfoAllocCount, 0);
1000 atomic_set(&tconInfoAllocCount, 0);
1001 atomic_set(&tcpSesAllocCount, 0);
1002 atomic_set(&tcpSesReconnectCount, 0);
1003 atomic_set(&tconInfoReconnectCount, 0);
1005 atomic_set(&bufAllocCount, 0);
1006 atomic_set(&smBufAllocCount, 0);
1007 #ifdef CONFIG_CIFS_STATS2
1008 atomic_set(&totBufAllocCount, 0);
1009 atomic_set(&totSmBufAllocCount, 0);
1010 #endif /* CONFIG_CIFS_STATS2 */
1012 atomic_set(&midCount, 0);
1013 GlobalCurrentXid = 0;
1014 GlobalTotalActiveXid = 0;
1015 GlobalMaxActiveXid = 0;
1016 memset(Local_System_Name, 0, 15);
1017 rwlock_init(&GlobalSMBSeslock);
1018 spin_lock_init(&GlobalMid_Lock);
1020 if (cifs_max_pending < 2) {
1021 cifs_max_pending = 2;
1022 cFYI(1, ("cifs_max_pending set to min of 2"));
1023 } else if (cifs_max_pending > 256) {
1024 cifs_max_pending = 256;
1025 cFYI(1, ("cifs_max_pending set to max of 256"));
1028 rc = cifs_init_inodecache();
1030 goto out_clean_proc;
1032 rc = cifs_init_mids();
1034 goto out_destroy_inodecache;
1036 rc = cifs_init_request_bufs();
1038 goto out_destroy_mids;
1040 rc = register_filesystem(&cifs_fs_type);
1042 goto out_destroy_request_bufs;
1043 #ifdef CONFIG_CIFS_UPCALL
1044 rc = register_key_type(&cifs_spnego_key_type);
1046 goto out_unregister_filesystem;
1048 #ifdef CONFIG_CIFS_DFS_UPCALL
1049 rc = register_key_type(&key_type_dns_resolver);
1051 goto out_unregister_key_type;
1053 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1054 if (IS_ERR(oplockThread)) {
1055 rc = PTR_ERR(oplockThread);
1056 cERROR(1, ("error %d create oplock thread", rc));
1057 goto out_unregister_dfs_key_type;
1060 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1061 if (IS_ERR(dnotifyThread)) {
1062 rc = PTR_ERR(dnotifyThread);
1063 cERROR(1, ("error %d create dnotify thread", rc));
1064 goto out_stop_oplock_thread;
1069 out_stop_oplock_thread:
1070 kthread_stop(oplockThread);
1071 out_unregister_dfs_key_type:
1072 #ifdef CONFIG_CIFS_DFS_UPCALL
1073 unregister_key_type(&key_type_dns_resolver);
1074 out_unregister_key_type:
1076 #ifdef CONFIG_CIFS_UPCALL
1077 unregister_key_type(&cifs_spnego_key_type);
1078 out_unregister_filesystem:
1080 unregister_filesystem(&cifs_fs_type);
1081 out_destroy_request_bufs:
1082 cifs_destroy_request_bufs();
1084 cifs_destroy_mids();
1085 out_destroy_inodecache:
1086 cifs_destroy_inodecache();
1095 cFYI(DBG2, ("exit_cifs"));
1097 #ifdef CONFIG_CIFS_DFS_UPCALL
1098 cifs_dfs_release_automount_timer();
1099 unregister_key_type(&key_type_dns_resolver);
1101 #ifdef CONFIG_CIFS_UPCALL
1102 unregister_key_type(&cifs_spnego_key_type);
1104 unregister_filesystem(&cifs_fs_type);
1105 cifs_destroy_inodecache();
1106 cifs_destroy_mids();
1107 cifs_destroy_request_bufs();
1108 kthread_stop(oplockThread);
1109 kthread_stop(dnotifyThread);
1112 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1113 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1115 ("VFS to access servers complying with the SNIA CIFS Specification "
1116 "e.g. Samba and Windows");
1117 MODULE_VERSION(CIFS_VERSION);
1118 module_init(init_cifs)
1119 module_exit(exit_cifs)