4 * Copyright (C) International Business Machines Corp., 2002,2008
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);
356 if (!cifs_sb->tcon->unix_ext) {
357 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
358 cifs_sb->mnt_file_mode,
359 cifs_sb->mnt_dir_mode);
361 if (cifs_sb->tcon->seal)
362 seq_printf(s, ",seal");
363 if (cifs_sb->tcon->nocase)
364 seq_printf(s, ",nocase");
365 if (cifs_sb->tcon->retry)
366 seq_printf(s, ",hard");
368 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
369 seq_printf(s, ",posixpaths");
370 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
371 seq_printf(s, ",setuids");
372 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
373 seq_printf(s, ",serverino");
374 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
375 seq_printf(s, ",directio");
376 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
377 seq_printf(s, ",nouser_xattr");
378 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
379 seq_printf(s, ",mapchars");
380 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
381 seq_printf(s, ",sfu");
382 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
383 seq_printf(s, ",nobrl");
384 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
385 seq_printf(s, ",cifsacl");
386 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
387 seq_printf(s, ",dynperm");
388 if (m->mnt_sb->s_flags & MS_POSIXACL)
389 seq_printf(s, ",acl");
391 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
392 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
397 #ifdef CONFIG_CIFS_QUOTA
398 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
399 struct fs_disk_quota *pdquota)
403 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
404 struct cifsTconInfo *pTcon;
407 pTcon = cifs_sb->tcon;
414 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
423 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
424 struct fs_disk_quota *pdquota)
428 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
429 struct cifsTconInfo *pTcon;
432 pTcon = cifs_sb->tcon;
438 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
447 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
451 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
452 struct cifsTconInfo *pTcon;
455 pTcon = cifs_sb->tcon;
461 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
470 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
474 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
475 struct cifsTconInfo *pTcon;
478 pTcon = cifs_sb->tcon;
484 cFYI(1, ("pqstats %p", qstats));
493 static struct quotactl_ops cifs_quotactl_ops = {
494 .set_xquota = cifs_xquota_set,
495 .get_xquota = cifs_xquota_get,
496 .set_xstate = cifs_xstate_set,
497 .get_xstate = cifs_xstate_get,
501 static void cifs_umount_begin(struct super_block *sb)
503 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
504 struct cifsTconInfo *tcon;
509 tcon = cifs_sb->tcon;
512 down(&tcon->tconSem);
513 if (atomic_read(&tcon->useCount) == 1)
514 tcon->tidStatus = CifsExiting;
517 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
518 /* cancel_notify_requests(tcon); */
519 if (tcon->ses && tcon->ses->server) {
520 cFYI(1, ("wake up tasks now - umount begin not complete"));
521 wake_up_all(&tcon->ses->server->request_q);
522 wake_up_all(&tcon->ses->server->response_q);
523 msleep(1); /* yield */
524 /* we have to kick the requests once more */
525 wake_up_all(&tcon->ses->server->response_q);
528 /* BB FIXME - finish add checks for tidStatus BB */
533 #ifdef CONFIG_CIFS_STATS2
534 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
541 static int cifs_remount(struct super_block *sb, int *flags, char *data)
543 *flags |= MS_NODIRATIME;
547 static const struct super_operations cifs_super_ops = {
548 .put_super = cifs_put_super,
549 .statfs = cifs_statfs,
550 .alloc_inode = cifs_alloc_inode,
551 .destroy_inode = cifs_destroy_inode,
552 /* .drop_inode = generic_delete_inode,
553 .delete_inode = cifs_delete_inode, */ /* Do not need above two
554 functions unless later we add lazy close of inodes or unless the
555 kernel forgets to call us with the same number of releases (closes)
557 .show_options = cifs_show_options,
558 .umount_begin = cifs_umount_begin,
559 .remount_fs = cifs_remount,
560 #ifdef CONFIG_CIFS_STATS2
561 .show_stats = cifs_show_stats,
566 cifs_get_sb(struct file_system_type *fs_type,
567 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
570 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
572 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
579 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
581 up_write(&sb->s_umount);
582 deactivate_super(sb);
585 sb->s_flags |= MS_ACTIVE;
586 return simple_set_mnt(mnt, sb);
589 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
590 unsigned long nr_segs, loff_t pos)
592 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
595 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
596 if (!CIFS_I(inode)->clientCanCacheAll)
597 filemap_fdatawrite(inode->i_mapping);
601 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
603 /* origin == SEEK_END => we must revalidate the cached file length */
604 if (origin == SEEK_END) {
607 /* some applications poll for the file length in this strange
608 way so we must seek to end on non-oplocked files by
609 setting the revalidate time to zero */
610 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
612 retval = cifs_revalidate(file->f_path.dentry);
614 return (loff_t)retval;
616 return remote_llseek(file, offset, origin);
619 struct file_system_type cifs_fs_type = {
620 .owner = THIS_MODULE,
622 .get_sb = cifs_get_sb,
623 .kill_sb = kill_anon_super,
626 const struct inode_operations cifs_dir_inode_ops = {
627 .create = cifs_create,
628 .lookup = cifs_lookup,
629 .getattr = cifs_getattr,
630 .unlink = cifs_unlink,
631 .link = cifs_hardlink,
634 .rename = cifs_rename,
635 .permission = cifs_permission,
636 /* revalidate:cifs_revalidate, */
637 .setattr = cifs_setattr,
638 .symlink = cifs_symlink,
640 #ifdef CONFIG_CIFS_XATTR
641 .setxattr = cifs_setxattr,
642 .getxattr = cifs_getxattr,
643 .listxattr = cifs_listxattr,
644 .removexattr = cifs_removexattr,
648 const struct inode_operations cifs_file_inode_ops = {
649 /* revalidate:cifs_revalidate, */
650 .setattr = cifs_setattr,
651 .getattr = cifs_getattr, /* do we need this anymore? */
652 .rename = cifs_rename,
653 .permission = cifs_permission,
654 #ifdef CONFIG_CIFS_XATTR
655 .setxattr = cifs_setxattr,
656 .getxattr = cifs_getxattr,
657 .listxattr = cifs_listxattr,
658 .removexattr = cifs_removexattr,
662 const struct inode_operations cifs_symlink_inode_ops = {
663 .readlink = generic_readlink,
664 .follow_link = cifs_follow_link,
665 .put_link = cifs_put_link,
666 .permission = cifs_permission,
667 /* BB add the following two eventually */
668 /* revalidate: cifs_revalidate,
669 setattr: cifs_notify_change, *//* BB do we need notify change */
670 #ifdef CONFIG_CIFS_XATTR
671 .setxattr = cifs_setxattr,
672 .getxattr = cifs_getxattr,
673 .listxattr = cifs_listxattr,
674 .removexattr = cifs_removexattr,
678 const struct file_operations cifs_file_ops = {
679 .read = do_sync_read,
680 .write = do_sync_write,
681 .aio_read = generic_file_aio_read,
682 .aio_write = cifs_file_aio_write,
684 .release = cifs_close,
688 .mmap = cifs_file_mmap,
689 .splice_read = generic_file_splice_read,
690 .llseek = cifs_llseek,
691 #ifdef CONFIG_CIFS_POSIX
692 .unlocked_ioctl = cifs_ioctl,
693 #endif /* CONFIG_CIFS_POSIX */
695 #ifdef CONFIG_CIFS_EXPERIMENTAL
696 .dir_notify = cifs_dir_notify,
697 #endif /* CONFIG_CIFS_EXPERIMENTAL */
700 const struct file_operations cifs_file_direct_ops = {
701 /* no mmap, no aio, no readv -
702 BB reevaluate whether they can be done with directio, no cache */
703 .read = cifs_user_read,
704 .write = cifs_user_write,
706 .release = cifs_close,
710 .splice_read = generic_file_splice_read,
711 #ifdef CONFIG_CIFS_POSIX
712 .unlocked_ioctl = cifs_ioctl,
713 #endif /* CONFIG_CIFS_POSIX */
714 .llseek = cifs_llseek,
715 #ifdef CONFIG_CIFS_EXPERIMENTAL
716 .dir_notify = cifs_dir_notify,
717 #endif /* CONFIG_CIFS_EXPERIMENTAL */
719 const struct file_operations cifs_file_nobrl_ops = {
720 .read = do_sync_read,
721 .write = do_sync_write,
722 .aio_read = generic_file_aio_read,
723 .aio_write = cifs_file_aio_write,
725 .release = cifs_close,
728 .mmap = cifs_file_mmap,
729 .splice_read = generic_file_splice_read,
730 .llseek = cifs_llseek,
731 #ifdef CONFIG_CIFS_POSIX
732 .unlocked_ioctl = cifs_ioctl,
733 #endif /* CONFIG_CIFS_POSIX */
735 #ifdef CONFIG_CIFS_EXPERIMENTAL
736 .dir_notify = cifs_dir_notify,
737 #endif /* CONFIG_CIFS_EXPERIMENTAL */
740 const struct file_operations cifs_file_direct_nobrl_ops = {
741 /* no mmap, no aio, no readv -
742 BB reevaluate whether they can be done with directio, no cache */
743 .read = cifs_user_read,
744 .write = cifs_user_write,
746 .release = cifs_close,
749 .splice_read = generic_file_splice_read,
750 #ifdef CONFIG_CIFS_POSIX
751 .unlocked_ioctl = cifs_ioctl,
752 #endif /* CONFIG_CIFS_POSIX */
753 .llseek = cifs_llseek,
754 #ifdef CONFIG_CIFS_EXPERIMENTAL
755 .dir_notify = cifs_dir_notify,
756 #endif /* CONFIG_CIFS_EXPERIMENTAL */
759 const struct file_operations cifs_dir_ops = {
760 .readdir = cifs_readdir,
761 .release = cifs_closedir,
762 .read = generic_read_dir,
763 #ifdef CONFIG_CIFS_EXPERIMENTAL
764 .dir_notify = cifs_dir_notify,
765 #endif /* CONFIG_CIFS_EXPERIMENTAL */
766 .unlocked_ioctl = cifs_ioctl,
770 cifs_init_once(struct kmem_cache *cachep, void *inode)
772 struct cifsInodeInfo *cifsi = inode;
774 inode_init_once(&cifsi->vfs_inode);
775 INIT_LIST_HEAD(&cifsi->lockList);
779 cifs_init_inodecache(void)
781 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
782 sizeof(struct cifsInodeInfo),
783 0, (SLAB_RECLAIM_ACCOUNT|
786 if (cifs_inode_cachep == NULL)
793 cifs_destroy_inodecache(void)
795 kmem_cache_destroy(cifs_inode_cachep);
799 cifs_init_request_bufs(void)
801 if (CIFSMaxBufSize < 8192) {
802 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
803 Unicode path name has to fit in any SMB/CIFS path based frames */
804 CIFSMaxBufSize = 8192;
805 } else if (CIFSMaxBufSize > 1024*127) {
806 CIFSMaxBufSize = 1024 * 127;
808 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
810 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
811 cifs_req_cachep = kmem_cache_create("cifs_request",
813 MAX_CIFS_HDR_SIZE, 0,
814 SLAB_HWCACHE_ALIGN, NULL);
815 if (cifs_req_cachep == NULL)
818 if (cifs_min_rcv < 1)
820 else if (cifs_min_rcv > 64) {
822 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
825 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
828 if (cifs_req_poolp == NULL) {
829 kmem_cache_destroy(cifs_req_cachep);
832 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
833 almost all handle based requests (but not write response, nor is it
834 sufficient for path based requests). A smaller size would have
835 been more efficient (compacting multiple slab items on one 4k page)
836 for the case in which debug was on, but this larger size allows
837 more SMBs to use small buffer alloc and is still much more
838 efficient to alloc 1 per page off the slab compared to 17K (5page)
839 alloc of large cifs buffers even when page debugging is on */
840 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
841 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
843 if (cifs_sm_req_cachep == NULL) {
844 mempool_destroy(cifs_req_poolp);
845 kmem_cache_destroy(cifs_req_cachep);
849 if (cifs_min_small < 2)
851 else if (cifs_min_small > 256) {
852 cifs_min_small = 256;
853 cFYI(1, ("cifs_min_small set to maximum (256)"));
856 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
859 if (cifs_sm_req_poolp == NULL) {
860 mempool_destroy(cifs_req_poolp);
861 kmem_cache_destroy(cifs_req_cachep);
862 kmem_cache_destroy(cifs_sm_req_cachep);
870 cifs_destroy_request_bufs(void)
872 mempool_destroy(cifs_req_poolp);
873 kmem_cache_destroy(cifs_req_cachep);
874 mempool_destroy(cifs_sm_req_poolp);
875 kmem_cache_destroy(cifs_sm_req_cachep);
881 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
882 sizeof(struct mid_q_entry), 0,
883 SLAB_HWCACHE_ALIGN, NULL);
884 if (cifs_mid_cachep == NULL)
887 /* 3 is a reasonable minimum number of simultaneous operations */
888 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
889 if (cifs_mid_poolp == NULL) {
890 kmem_cache_destroy(cifs_mid_cachep);
894 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
895 sizeof(struct oplock_q_entry), 0,
896 SLAB_HWCACHE_ALIGN, NULL);
897 if (cifs_oplock_cachep == NULL) {
898 mempool_destroy(cifs_mid_poolp);
899 kmem_cache_destroy(cifs_mid_cachep);
907 cifs_destroy_mids(void)
909 mempool_destroy(cifs_mid_poolp);
910 kmem_cache_destroy(cifs_mid_cachep);
911 kmem_cache_destroy(cifs_oplock_cachep);
914 static int cifs_oplock_thread(void *dummyarg)
916 struct oplock_q_entry *oplock_item;
917 struct cifsTconInfo *pTcon;
927 spin_lock(&GlobalMid_Lock);
928 if (list_empty(&GlobalOplock_Q)) {
929 spin_unlock(&GlobalMid_Lock);
930 set_current_state(TASK_INTERRUPTIBLE);
931 schedule_timeout(39*HZ);
933 oplock_item = list_entry(GlobalOplock_Q.next,
934 struct oplock_q_entry, qhead);
936 cFYI(1, ("found oplock item to write out"));
937 pTcon = oplock_item->tcon;
938 inode = oplock_item->pinode;
939 netfid = oplock_item->netfid;
940 spin_unlock(&GlobalMid_Lock);
941 DeleteOplockQEntry(oplock_item);
942 /* can not grab inode sem here since it would
943 deadlock when oplock received on delete
944 since vfs_unlink holds the i_mutex across
946 /* mutex_lock(&inode->i_mutex);*/
947 if (S_ISREG(inode->i_mode)) {
949 filemap_fdatawrite(inode->i_mapping);
950 if (CIFS_I(inode)->clientCanCacheRead
952 waitrc = filemap_fdatawait(inode->i_mapping);
953 invalidate_remote_inode(inode);
959 /* mutex_unlock(&inode->i_mutex);*/
961 CIFS_I(inode)->write_behind_rc = rc;
962 cFYI(1, ("Oplock flush inode %p rc %d",
965 /* releasing stale oplock after recent reconnect
966 of smb session using a now incorrect file
967 handle is not a data integrity issue but do
968 not bother sending an oplock release if session
969 to server still is disconnected since oplock
970 already released by the server in that case */
971 if (pTcon->tidStatus != CifsNeedReconnect) {
972 rc = CIFSSMBLock(0, pTcon, netfid,
973 0 /* len */ , 0 /* offset */, 0,
974 0, LOCKING_ANDX_OPLOCK_RELEASE,
975 false /* wait flag */);
976 cFYI(1, ("Oplock release rc = %d", rc));
979 spin_unlock(&GlobalMid_Lock);
980 set_current_state(TASK_INTERRUPTIBLE);
981 schedule_timeout(1); /* yield in case q were corrupt */
983 } while (!kthread_should_stop());
988 static int cifs_dnotify_thread(void *dummyarg)
990 struct list_head *tmp;
991 struct cifsSesInfo *ses;
996 set_current_state(TASK_INTERRUPTIBLE);
997 schedule_timeout(15*HZ);
998 read_lock(&GlobalSMBSeslock);
999 /* check if any stuck requests that need
1000 to be woken up and wakeq so the
1001 thread can wake up and error out */
1002 list_for_each(tmp, &GlobalSMBSessionList) {
1003 ses = list_entry(tmp, struct cifsSesInfo,
1005 if (ses && ses->server &&
1006 atomic_read(&ses->server->inFlight))
1007 wake_up_all(&ses->server->response_q);
1009 read_unlock(&GlobalSMBSeslock);
1010 } while (!kthread_should_stop());
1020 /* INIT_LIST_HEAD(&GlobalServerList);*/ /* BB not implemented yet */
1021 INIT_LIST_HEAD(&GlobalSMBSessionList);
1022 INIT_LIST_HEAD(&GlobalTreeConnectionList);
1023 INIT_LIST_HEAD(&GlobalOplock_Q);
1024 #ifdef CONFIG_CIFS_EXPERIMENTAL
1025 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1026 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1029 * Initialize Global counters
1031 atomic_set(&sesInfoAllocCount, 0);
1032 atomic_set(&tconInfoAllocCount, 0);
1033 atomic_set(&tcpSesAllocCount, 0);
1034 atomic_set(&tcpSesReconnectCount, 0);
1035 atomic_set(&tconInfoReconnectCount, 0);
1037 atomic_set(&bufAllocCount, 0);
1038 atomic_set(&smBufAllocCount, 0);
1039 #ifdef CONFIG_CIFS_STATS2
1040 atomic_set(&totBufAllocCount, 0);
1041 atomic_set(&totSmBufAllocCount, 0);
1042 #endif /* CONFIG_CIFS_STATS2 */
1044 atomic_set(&midCount, 0);
1045 GlobalCurrentXid = 0;
1046 GlobalTotalActiveXid = 0;
1047 GlobalMaxActiveXid = 0;
1048 memset(Local_System_Name, 0, 15);
1049 rwlock_init(&GlobalSMBSeslock);
1050 spin_lock_init(&GlobalMid_Lock);
1052 if (cifs_max_pending < 2) {
1053 cifs_max_pending = 2;
1054 cFYI(1, ("cifs_max_pending set to min of 2"));
1055 } else if (cifs_max_pending > 256) {
1056 cifs_max_pending = 256;
1057 cFYI(1, ("cifs_max_pending set to max of 256"));
1060 rc = cifs_init_inodecache();
1062 goto out_clean_proc;
1064 rc = cifs_init_mids();
1066 goto out_destroy_inodecache;
1068 rc = cifs_init_request_bufs();
1070 goto out_destroy_mids;
1072 rc = register_filesystem(&cifs_fs_type);
1074 goto out_destroy_request_bufs;
1075 #ifdef CONFIG_CIFS_UPCALL
1076 rc = register_key_type(&cifs_spnego_key_type);
1078 goto out_unregister_filesystem;
1080 #ifdef CONFIG_CIFS_DFS_UPCALL
1081 rc = register_key_type(&key_type_dns_resolver);
1083 goto out_unregister_key_type;
1085 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1086 if (IS_ERR(oplockThread)) {
1087 rc = PTR_ERR(oplockThread);
1088 cERROR(1, ("error %d create oplock thread", rc));
1089 goto out_unregister_dfs_key_type;
1092 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1093 if (IS_ERR(dnotifyThread)) {
1094 rc = PTR_ERR(dnotifyThread);
1095 cERROR(1, ("error %d create dnotify thread", rc));
1096 goto out_stop_oplock_thread;
1101 out_stop_oplock_thread:
1102 kthread_stop(oplockThread);
1103 out_unregister_dfs_key_type:
1104 #ifdef CONFIG_CIFS_DFS_UPCALL
1105 unregister_key_type(&key_type_dns_resolver);
1106 out_unregister_key_type:
1108 #ifdef CONFIG_CIFS_UPCALL
1109 unregister_key_type(&cifs_spnego_key_type);
1110 out_unregister_filesystem:
1112 unregister_filesystem(&cifs_fs_type);
1113 out_destroy_request_bufs:
1114 cifs_destroy_request_bufs();
1116 cifs_destroy_mids();
1117 out_destroy_inodecache:
1118 cifs_destroy_inodecache();
1127 cFYI(DBG2, ("exit_cifs"));
1129 #ifdef CONFIG_CIFS_DFS_UPCALL
1130 cifs_dfs_release_automount_timer();
1131 unregister_key_type(&key_type_dns_resolver);
1133 #ifdef CONFIG_CIFS_UPCALL
1134 unregister_key_type(&cifs_spnego_key_type);
1136 unregister_filesystem(&cifs_fs_type);
1137 cifs_destroy_inodecache();
1138 cifs_destroy_mids();
1139 cifs_destroy_request_bufs();
1140 kthread_stop(oplockThread);
1141 kthread_stop(dnotifyThread);
1144 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1145 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1147 ("VFS to access servers complying with the SNIA CIFS Specification "
1148 "e.g. Samba and Windows");
1149 MODULE_VERSION(CIFS_VERSION);
1150 module_init(init_cifs)
1151 module_exit(exit_cifs)