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>
38 #include <linux/smp_lock.h>
41 #define DECLARE_GLOBALS_HERE
43 #include "cifsproto.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
47 #include <linux/key-type.h>
48 #include "dns_resolve.h"
49 #include "cifs_spnego.h"
50 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
52 #ifdef CONFIG_CIFS_QUOTA
53 static struct quotactl_ops cifs_quotactl_ops;
59 unsigned int oplockEnabled = 1;
60 unsigned int experimEnabled = 0;
61 unsigned int linuxExtEnabled = 1;
62 unsigned int lookupCacheEnabled = 1;
63 unsigned int multiuser_mount = 0;
64 unsigned int extended_security = CIFSSEC_DEF;
65 /* unsigned int ntlmv2_support = 0; */
66 unsigned int sign_CIFS_PDUs = 1;
67 extern struct task_struct *oplockThread; /* remove sparse warning */
68 struct task_struct *oplockThread = NULL;
69 /* extern struct task_struct * dnotifyThread; remove sparse warning */
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;
102 /* BB should we make this contingent on mount parm? */
103 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
104 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
105 cifs_sb = CIFS_SB(sb);
109 #ifdef CONFIG_CIFS_DFS_UPCALL
110 /* copy mount params to sb for use in submounts */
111 /* BB: should we move this after the mount so we
112 * do not have to do the copy on failed mounts?
113 * BB: May be it is better to do simple copy before
114 * complex operation (mount), and in case of fail
115 * just exit instead of doing mount and attempting
116 * undo it if this copy fails?*/
118 int len = strlen(data);
119 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
120 if (cifs_sb->mountdata == NULL) {
121 kfree(sb->s_fs_info);
122 sb->s_fs_info = NULL;
125 strncpy(cifs_sb->mountdata, data, len + 1);
126 cifs_sb->mountdata[len] = '\0';
130 rc = cifs_mount(sb, cifs_sb, data, devname);
135 ("cifs_mount failed w/return code = %d", rc));
136 goto out_mount_failed;
139 sb->s_magic = CIFS_MAGIC_NUMBER;
140 sb->s_op = &cifs_super_ops;
141 /* if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
143 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
144 #ifdef CONFIG_CIFS_QUOTA
145 sb->s_qcop = &cifs_quotactl_ops;
147 sb->s_blocksize = CIFS_MAX_MSGSIZE;
148 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
149 inode = cifs_root_iget(sb, ROOT_I);
157 sb->s_root = d_alloc_root(inode);
164 #ifdef CONFIG_CIFS_EXPERIMENTAL
165 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
166 cFYI(1, ("export ops supported"));
167 sb->s_export_op = &cifs_export_ops;
169 #endif /* EXPERIMENTAL */
174 cERROR(1, ("cifs_read_super: get root inode failed"));
178 cifs_umount(sb, cifs_sb);
182 #ifdef CONFIG_CIFS_DFS_UPCALL
183 if (cifs_sb->mountdata) {
184 kfree(cifs_sb->mountdata);
185 cifs_sb->mountdata = NULL;
188 if (cifs_sb->local_nls)
189 unload_nls(cifs_sb->local_nls);
196 cifs_put_super(struct super_block *sb)
199 struct cifs_sb_info *cifs_sb;
201 cFYI(1, ("In cifs_put_super"));
202 cifs_sb = CIFS_SB(sb);
203 if (cifs_sb == NULL) {
204 cFYI(1, ("Empty cifs superblock info passed to unmount"));
207 rc = cifs_umount(sb, cifs_sb);
209 cERROR(1, ("cifs_umount failed with return code %d", rc));
210 #ifdef CONFIG_CIFS_DFS_UPCALL
211 if (cifs_sb->mountdata) {
212 kfree(cifs_sb->mountdata);
213 cifs_sb->mountdata = NULL;
217 unload_nls(cifs_sb->local_nls);
223 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
225 struct super_block *sb = dentry->d_sb;
226 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
227 struct cifsTconInfo *tcon = cifs_sb->tcon;
228 int rc = -EOPNOTSUPP;
233 buf->f_type = CIFS_MAGIC_NUMBER;
236 * PATH_MAX may be too long - it would presumably be total path,
237 * but note that some servers (includinng Samba 3) have a shorter
240 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
242 buf->f_namelen = PATH_MAX;
243 buf->f_files = 0; /* undefined */
244 buf->f_ffree = 0; /* unlimited */
247 * We could add a second check for a QFS Unix capability bit
249 if ((tcon->ses->capabilities & CAP_UNIX) &&
250 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
251 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
254 * Only need to call the old QFSInfo if failed on newer one,
257 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
258 rc = CIFSSMBQFSInfo(xid, tcon, buf);
261 * Some old Windows servers also do not support level 103, retry with
262 * older level one if old server failed the previous call or we
263 * bypassed it because we detected that this was an older LANMAN sess
266 rc = SMBOldQFSInfo(xid, tcon, buf);
272 static int cifs_permission(struct inode *inode, int mask)
274 struct cifs_sb_info *cifs_sb;
276 cifs_sb = CIFS_SB(inode->i_sb);
278 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
279 if ((mask & MAY_EXEC) && !execute_ok(inode))
283 } else /* file mode might have been restricted at mount time
284 on the client (above and beyond ACL on servers) for
285 servers which do not support setting and viewing mode bits,
286 so allowing client to check permissions is useful */
287 return generic_permission(inode, mask, NULL);
290 static struct kmem_cache *cifs_inode_cachep;
291 static struct kmem_cache *cifs_req_cachep;
292 static struct kmem_cache *cifs_mid_cachep;
293 struct kmem_cache *cifs_oplock_cachep;
294 static struct kmem_cache *cifs_sm_req_cachep;
295 mempool_t *cifs_sm_req_poolp;
296 mempool_t *cifs_req_poolp;
297 mempool_t *cifs_mid_poolp;
299 static struct inode *
300 cifs_alloc_inode(struct super_block *sb)
302 struct cifsInodeInfo *cifs_inode;
303 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
306 cifs_inode->cifsAttrs = 0x20; /* default */
307 atomic_set(&cifs_inode->inUse, 0);
308 cifs_inode->time = 0;
309 cifs_inode->write_behind_rc = 0;
310 /* Until the file is open and we have gotten oplock
311 info back from the server, can not assume caching of
312 file data or metadata */
313 cifs_inode->clientCanCacheRead = false;
314 cifs_inode->clientCanCacheAll = false;
315 cifs_inode->delete_pending = false;
316 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
317 cifs_inode->server_eof = 0;
319 /* Can not set i_flags here - they get immediately overwritten
320 to zero by the VFS */
321 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
322 INIT_LIST_HEAD(&cifs_inode->openFileList);
323 return &cifs_inode->vfs_inode;
327 cifs_destroy_inode(struct inode *inode)
329 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
333 * cifs_show_options() is for displaying mount options in /proc/mounts.
334 * Not all settable options are displayed but most of the important
338 cifs_show_options(struct seq_file *s, struct vfsmount *m)
340 struct cifs_sb_info *cifs_sb;
341 struct cifsTconInfo *tcon;
342 struct TCP_Server_Info *server;
344 cifs_sb = CIFS_SB(m->mnt_sb);
347 tcon = cifs_sb->tcon;
349 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
351 if (tcon->ses->userName)
352 seq_printf(s, ",username=%s",
353 tcon->ses->userName);
354 if (tcon->ses->domainName)
355 seq_printf(s, ",domain=%s",
356 tcon->ses->domainName);
357 server = tcon->ses->server;
359 seq_printf(s, ",addr=");
360 switch (server->addr.sockAddr6.
363 seq_printf(s, "%pI6",
364 &server->addr.sockAddr6.sin6_addr);
367 seq_printf(s, "%pI4",
368 &server->addr.sockAddr.sin_addr.s_addr);
373 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
375 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
376 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
378 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
379 if (!tcon->unix_ext) {
380 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
381 cifs_sb->mnt_file_mode,
382 cifs_sb->mnt_dir_mode);
385 seq_printf(s, ",seal");
387 seq_printf(s, ",nocase");
389 seq_printf(s, ",hard");
391 if (cifs_sb->prepath)
392 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
393 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
394 seq_printf(s, ",posixpaths");
395 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
396 seq_printf(s, ",setuids");
397 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
398 seq_printf(s, ",serverino");
399 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
400 seq_printf(s, ",directio");
401 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
402 seq_printf(s, ",nouser_xattr");
403 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
404 seq_printf(s, ",mapchars");
405 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
406 seq_printf(s, ",sfu");
407 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
408 seq_printf(s, ",nobrl");
409 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
410 seq_printf(s, ",cifsacl");
411 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
412 seq_printf(s, ",dynperm");
413 if (m->mnt_sb->s_flags & MS_POSIXACL)
414 seq_printf(s, ",acl");
416 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
417 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
422 #ifdef CONFIG_CIFS_QUOTA
423 int cifs_xquota_set(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;
439 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
447 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
448 struct fs_disk_quota *pdquota)
452 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
453 struct cifsTconInfo *pTcon;
456 pTcon = cifs_sb->tcon;
462 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
470 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
474 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
475 struct cifsTconInfo *pTcon;
478 pTcon = cifs_sb->tcon;
484 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
492 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
496 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
497 struct cifsTconInfo *pTcon;
500 pTcon = cifs_sb->tcon;
506 cFYI(1, ("pqstats %p", qstats));
514 static struct quotactl_ops cifs_quotactl_ops = {
515 .set_xquota = cifs_xquota_set,
516 .get_xquota = cifs_xquota_get,
517 .set_xstate = cifs_xstate_set,
518 .get_xstate = cifs_xstate_get,
522 static void cifs_umount_begin(struct super_block *sb)
524 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
525 struct cifsTconInfo *tcon;
530 tcon = cifs_sb->tcon;
535 read_lock(&cifs_tcp_ses_lock);
536 if (tcon->tc_count == 1)
537 tcon->tidStatus = CifsExiting;
538 read_unlock(&cifs_tcp_ses_lock);
540 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
541 /* cancel_notify_requests(tcon); */
542 if (tcon->ses && tcon->ses->server) {
543 cFYI(1, ("wake up tasks now - umount begin not complete"));
544 wake_up_all(&tcon->ses->server->request_q);
545 wake_up_all(&tcon->ses->server->response_q);
546 msleep(1); /* yield */
547 /* we have to kick the requests once more */
548 wake_up_all(&tcon->ses->server->response_q);
551 /* BB FIXME - finish add checks for tidStatus BB */
557 #ifdef CONFIG_CIFS_STATS2
558 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
565 static int cifs_remount(struct super_block *sb, int *flags, char *data)
567 *flags |= MS_NODIRATIME;
571 static const struct super_operations cifs_super_ops = {
572 .put_super = cifs_put_super,
573 .statfs = cifs_statfs,
574 .alloc_inode = cifs_alloc_inode,
575 .destroy_inode = cifs_destroy_inode,
576 /* .drop_inode = generic_delete_inode,
577 .delete_inode = cifs_delete_inode, */ /* Do not need above two
578 functions unless later we add lazy close of inodes or unless the
579 kernel forgets to call us with the same number of releases (closes)
581 .show_options = cifs_show_options,
582 .umount_begin = cifs_umount_begin,
583 .remount_fs = cifs_remount,
584 #ifdef CONFIG_CIFS_STATS2
585 .show_stats = cifs_show_stats,
590 cifs_get_sb(struct file_system_type *fs_type,
591 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
594 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
596 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
603 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
605 deactivate_locked_super(sb);
608 sb->s_flags |= MS_ACTIVE;
609 simple_set_mnt(mnt, sb);
613 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
614 unsigned long nr_segs, loff_t pos)
616 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
619 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
620 if (!CIFS_I(inode)->clientCanCacheAll)
621 filemap_fdatawrite(inode->i_mapping);
625 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
627 /* origin == SEEK_END => we must revalidate the cached file length */
628 if (origin == SEEK_END) {
631 /* some applications poll for the file length in this strange
632 way so we must seek to end on non-oplocked files by
633 setting the revalidate time to zero */
634 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
636 retval = cifs_revalidate(file->f_path.dentry);
638 return (loff_t)retval;
640 return generic_file_llseek_unlocked(file, offset, origin);
643 #ifdef CONFIG_CIFS_EXPERIMENTAL
644 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
646 /* note that this is called by vfs setlease with the BKL held
647 although I doubt that BKL is needed here in cifs */
648 struct inode *inode = file->f_path.dentry->d_inode;
650 if (!(S_ISREG(inode->i_mode)))
653 /* check if file is oplocked */
654 if (((arg == F_RDLCK) &&
655 (CIFS_I(inode)->clientCanCacheRead)) ||
657 (CIFS_I(inode)->clientCanCacheAll)))
658 return generic_setlease(file, arg, lease);
659 else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
660 !CIFS_I(inode)->clientCanCacheRead)
661 /* If the server claims to support oplock on this
662 file, then we still need to check oplock even
663 if the local_lease mount option is set, but there
664 are servers which do not support oplock for which
665 this mount option may be useful if the user
666 knows that the file won't be changed on the server
668 return generic_setlease(file, arg, lease);
674 struct file_system_type cifs_fs_type = {
675 .owner = THIS_MODULE,
677 .get_sb = cifs_get_sb,
678 .kill_sb = kill_anon_super,
681 const struct inode_operations cifs_dir_inode_ops = {
682 .create = cifs_create,
683 .lookup = cifs_lookup,
684 .getattr = cifs_getattr,
685 .unlink = cifs_unlink,
686 .link = cifs_hardlink,
689 .rename = cifs_rename,
690 .permission = cifs_permission,
691 /* revalidate:cifs_revalidate, */
692 .setattr = cifs_setattr,
693 .symlink = cifs_symlink,
695 #ifdef CONFIG_CIFS_XATTR
696 .setxattr = cifs_setxattr,
697 .getxattr = cifs_getxattr,
698 .listxattr = cifs_listxattr,
699 .removexattr = cifs_removexattr,
703 const struct inode_operations cifs_file_inode_ops = {
704 /* revalidate:cifs_revalidate, */
705 .setattr = cifs_setattr,
706 .getattr = cifs_getattr, /* do we need this anymore? */
707 .rename = cifs_rename,
708 .permission = cifs_permission,
709 #ifdef CONFIG_CIFS_XATTR
710 .setxattr = cifs_setxattr,
711 .getxattr = cifs_getxattr,
712 .listxattr = cifs_listxattr,
713 .removexattr = cifs_removexattr,
717 const struct inode_operations cifs_symlink_inode_ops = {
718 .readlink = generic_readlink,
719 .follow_link = cifs_follow_link,
720 .put_link = cifs_put_link,
721 .permission = cifs_permission,
722 /* BB add the following two eventually */
723 /* revalidate: cifs_revalidate,
724 setattr: cifs_notify_change, *//* BB do we need notify change */
725 #ifdef CONFIG_CIFS_XATTR
726 .setxattr = cifs_setxattr,
727 .getxattr = cifs_getxattr,
728 .listxattr = cifs_listxattr,
729 .removexattr = cifs_removexattr,
733 const struct file_operations cifs_file_ops = {
734 .read = do_sync_read,
735 .write = do_sync_write,
736 .aio_read = generic_file_aio_read,
737 .aio_write = cifs_file_aio_write,
739 .release = cifs_close,
743 .mmap = cifs_file_mmap,
744 .splice_read = generic_file_splice_read,
745 .llseek = cifs_llseek,
746 #ifdef CONFIG_CIFS_POSIX
747 .unlocked_ioctl = cifs_ioctl,
748 #endif /* CONFIG_CIFS_POSIX */
750 #ifdef CONFIG_CIFS_EXPERIMENTAL
751 .setlease = cifs_setlease,
752 #endif /* CONFIG_CIFS_EXPERIMENTAL */
755 const struct file_operations cifs_file_direct_ops = {
756 /* no mmap, no aio, no readv -
757 BB reevaluate whether they can be done with directio, no cache */
758 .read = cifs_user_read,
759 .write = cifs_user_write,
761 .release = cifs_close,
765 .splice_read = generic_file_splice_read,
766 #ifdef CONFIG_CIFS_POSIX
767 .unlocked_ioctl = cifs_ioctl,
768 #endif /* CONFIG_CIFS_POSIX */
769 .llseek = cifs_llseek,
770 #ifdef CONFIG_CIFS_EXPERIMENTAL
771 .setlease = cifs_setlease,
772 #endif /* CONFIG_CIFS_EXPERIMENTAL */
774 const struct file_operations cifs_file_nobrl_ops = {
775 .read = do_sync_read,
776 .write = do_sync_write,
777 .aio_read = generic_file_aio_read,
778 .aio_write = cifs_file_aio_write,
780 .release = cifs_close,
783 .mmap = cifs_file_mmap,
784 .splice_read = generic_file_splice_read,
785 .llseek = cifs_llseek,
786 #ifdef CONFIG_CIFS_POSIX
787 .unlocked_ioctl = cifs_ioctl,
788 #endif /* CONFIG_CIFS_POSIX */
790 #ifdef CONFIG_CIFS_EXPERIMENTAL
791 .setlease = cifs_setlease,
792 #endif /* CONFIG_CIFS_EXPERIMENTAL */
795 const struct file_operations cifs_file_direct_nobrl_ops = {
796 /* no mmap, no aio, no readv -
797 BB reevaluate whether they can be done with directio, no cache */
798 .read = cifs_user_read,
799 .write = cifs_user_write,
801 .release = cifs_close,
804 .splice_read = generic_file_splice_read,
805 #ifdef CONFIG_CIFS_POSIX
806 .unlocked_ioctl = cifs_ioctl,
807 #endif /* CONFIG_CIFS_POSIX */
808 .llseek = cifs_llseek,
809 #ifdef CONFIG_CIFS_EXPERIMENTAL
810 .setlease = cifs_setlease,
811 #endif /* CONFIG_CIFS_EXPERIMENTAL */
814 const struct file_operations cifs_dir_ops = {
815 .readdir = cifs_readdir,
816 .release = cifs_closedir,
817 .read = generic_read_dir,
818 .unlocked_ioctl = cifs_ioctl,
819 .llseek = generic_file_llseek,
823 cifs_init_once(void *inode)
825 struct cifsInodeInfo *cifsi = inode;
827 inode_init_once(&cifsi->vfs_inode);
828 INIT_LIST_HEAD(&cifsi->lockList);
832 cifs_init_inodecache(void)
834 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
835 sizeof(struct cifsInodeInfo),
836 0, (SLAB_RECLAIM_ACCOUNT|
839 if (cifs_inode_cachep == NULL)
846 cifs_destroy_inodecache(void)
848 kmem_cache_destroy(cifs_inode_cachep);
852 cifs_init_request_bufs(void)
854 if (CIFSMaxBufSize < 8192) {
855 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
856 Unicode path name has to fit in any SMB/CIFS path based frames */
857 CIFSMaxBufSize = 8192;
858 } else if (CIFSMaxBufSize > 1024*127) {
859 CIFSMaxBufSize = 1024 * 127;
861 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
863 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
864 cifs_req_cachep = kmem_cache_create("cifs_request",
866 MAX_CIFS_HDR_SIZE, 0,
867 SLAB_HWCACHE_ALIGN, NULL);
868 if (cifs_req_cachep == NULL)
871 if (cifs_min_rcv < 1)
873 else if (cifs_min_rcv > 64) {
875 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
878 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
881 if (cifs_req_poolp == NULL) {
882 kmem_cache_destroy(cifs_req_cachep);
885 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
886 almost all handle based requests (but not write response, nor is it
887 sufficient for path based requests). A smaller size would have
888 been more efficient (compacting multiple slab items on one 4k page)
889 for the case in which debug was on, but this larger size allows
890 more SMBs to use small buffer alloc and is still much more
891 efficient to alloc 1 per page off the slab compared to 17K (5page)
892 alloc of large cifs buffers even when page debugging is on */
893 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
894 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
896 if (cifs_sm_req_cachep == NULL) {
897 mempool_destroy(cifs_req_poolp);
898 kmem_cache_destroy(cifs_req_cachep);
902 if (cifs_min_small < 2)
904 else if (cifs_min_small > 256) {
905 cifs_min_small = 256;
906 cFYI(1, ("cifs_min_small set to maximum (256)"));
909 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
912 if (cifs_sm_req_poolp == NULL) {
913 mempool_destroy(cifs_req_poolp);
914 kmem_cache_destroy(cifs_req_cachep);
915 kmem_cache_destroy(cifs_sm_req_cachep);
923 cifs_destroy_request_bufs(void)
925 mempool_destroy(cifs_req_poolp);
926 kmem_cache_destroy(cifs_req_cachep);
927 mempool_destroy(cifs_sm_req_poolp);
928 kmem_cache_destroy(cifs_sm_req_cachep);
934 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
935 sizeof(struct mid_q_entry), 0,
936 SLAB_HWCACHE_ALIGN, NULL);
937 if (cifs_mid_cachep == NULL)
940 /* 3 is a reasonable minimum number of simultaneous operations */
941 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
942 if (cifs_mid_poolp == NULL) {
943 kmem_cache_destroy(cifs_mid_cachep);
947 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
948 sizeof(struct oplock_q_entry), 0,
949 SLAB_HWCACHE_ALIGN, NULL);
950 if (cifs_oplock_cachep == NULL) {
951 mempool_destroy(cifs_mid_poolp);
952 kmem_cache_destroy(cifs_mid_cachep);
960 cifs_destroy_mids(void)
962 mempool_destroy(cifs_mid_poolp);
963 kmem_cache_destroy(cifs_mid_cachep);
964 kmem_cache_destroy(cifs_oplock_cachep);
967 static int cifs_oplock_thread(void *dummyarg)
969 struct oplock_q_entry *oplock_item;
970 struct cifsTconInfo *pTcon;
980 spin_lock(&GlobalMid_Lock);
981 if (list_empty(&GlobalOplock_Q)) {
982 spin_unlock(&GlobalMid_Lock);
983 set_current_state(TASK_INTERRUPTIBLE);
984 schedule_timeout(39*HZ);
986 oplock_item = list_entry(GlobalOplock_Q.next,
987 struct oplock_q_entry, qhead);
988 cFYI(1, ("found oplock item to write out"));
989 pTcon = oplock_item->tcon;
990 inode = oplock_item->pinode;
991 netfid = oplock_item->netfid;
992 spin_unlock(&GlobalMid_Lock);
993 DeleteOplockQEntry(oplock_item);
994 /* can not grab inode sem here since it would
995 deadlock when oplock received on delete
996 since vfs_unlink holds the i_mutex across
998 /* mutex_lock(&inode->i_mutex);*/
999 if (S_ISREG(inode->i_mode)) {
1000 #ifdef CONFIG_CIFS_EXPERIMENTAL
1001 if (CIFS_I(inode)->clientCanCacheAll == 0)
1002 break_lease(inode, FMODE_READ);
1003 else if (CIFS_I(inode)->clientCanCacheRead == 0)
1004 break_lease(inode, FMODE_WRITE);
1006 rc = filemap_fdatawrite(inode->i_mapping);
1007 if (CIFS_I(inode)->clientCanCacheRead == 0) {
1008 waitrc = filemap_fdatawait(
1010 invalidate_remote_inode(inode);
1016 /* mutex_unlock(&inode->i_mutex);*/
1018 CIFS_I(inode)->write_behind_rc = rc;
1019 cFYI(1, ("Oplock flush inode %p rc %d",
1022 /* releasing stale oplock after recent reconnect
1023 of smb session using a now incorrect file
1024 handle is not a data integrity issue but do
1025 not bother sending an oplock release if session
1026 to server still is disconnected since oplock
1027 already released by the server in that case */
1028 if (!pTcon->need_reconnect) {
1029 rc = CIFSSMBLock(0, pTcon, netfid,
1030 0 /* len */ , 0 /* offset */, 0,
1031 0, LOCKING_ANDX_OPLOCK_RELEASE,
1032 false /* wait flag */);
1033 cFYI(1, ("Oplock release rc = %d", rc));
1035 set_current_state(TASK_INTERRUPTIBLE);
1036 schedule_timeout(1); /* yield in case q were corrupt */
1038 } while (!kthread_should_stop());
1048 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1049 INIT_LIST_HEAD(&GlobalOplock_Q);
1050 #ifdef CONFIG_CIFS_EXPERIMENTAL
1051 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1052 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1055 * Initialize Global counters
1057 atomic_set(&sesInfoAllocCount, 0);
1058 atomic_set(&tconInfoAllocCount, 0);
1059 atomic_set(&tcpSesAllocCount, 0);
1060 atomic_set(&tcpSesReconnectCount, 0);
1061 atomic_set(&tconInfoReconnectCount, 0);
1063 atomic_set(&bufAllocCount, 0);
1064 atomic_set(&smBufAllocCount, 0);
1065 #ifdef CONFIG_CIFS_STATS2
1066 atomic_set(&totBufAllocCount, 0);
1067 atomic_set(&totSmBufAllocCount, 0);
1068 #endif /* CONFIG_CIFS_STATS2 */
1070 atomic_set(&midCount, 0);
1071 GlobalCurrentXid = 0;
1072 GlobalTotalActiveXid = 0;
1073 GlobalMaxActiveXid = 0;
1074 memset(Local_System_Name, 0, 15);
1075 rwlock_init(&GlobalSMBSeslock);
1076 rwlock_init(&cifs_tcp_ses_lock);
1077 spin_lock_init(&GlobalMid_Lock);
1079 if (cifs_max_pending < 2) {
1080 cifs_max_pending = 2;
1081 cFYI(1, ("cifs_max_pending set to min of 2"));
1082 } else if (cifs_max_pending > 256) {
1083 cifs_max_pending = 256;
1084 cFYI(1, ("cifs_max_pending set to max of 256"));
1087 rc = cifs_init_inodecache();
1089 goto out_clean_proc;
1091 rc = cifs_init_mids();
1093 goto out_destroy_inodecache;
1095 rc = cifs_init_request_bufs();
1097 goto out_destroy_mids;
1099 rc = register_filesystem(&cifs_fs_type);
1101 goto out_destroy_request_bufs;
1102 #ifdef CONFIG_CIFS_UPCALL
1103 rc = register_key_type(&cifs_spnego_key_type);
1105 goto out_unregister_filesystem;
1107 #ifdef CONFIG_CIFS_DFS_UPCALL
1108 rc = register_key_type(&key_type_dns_resolver);
1110 goto out_unregister_key_type;
1112 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1113 if (IS_ERR(oplockThread)) {
1114 rc = PTR_ERR(oplockThread);
1115 cERROR(1, ("error %d create oplock thread", rc));
1116 goto out_unregister_dfs_key_type;
1121 out_unregister_dfs_key_type:
1122 #ifdef CONFIG_CIFS_DFS_UPCALL
1123 unregister_key_type(&key_type_dns_resolver);
1124 out_unregister_key_type:
1126 #ifdef CONFIG_CIFS_UPCALL
1127 unregister_key_type(&cifs_spnego_key_type);
1128 out_unregister_filesystem:
1130 unregister_filesystem(&cifs_fs_type);
1131 out_destroy_request_bufs:
1132 cifs_destroy_request_bufs();
1134 cifs_destroy_mids();
1135 out_destroy_inodecache:
1136 cifs_destroy_inodecache();
1145 cFYI(DBG2, ("exit_cifs"));
1147 #ifdef CONFIG_CIFS_DFS_UPCALL
1148 cifs_dfs_release_automount_timer();
1149 unregister_key_type(&key_type_dns_resolver);
1151 #ifdef CONFIG_CIFS_UPCALL
1152 unregister_key_type(&cifs_spnego_key_type);
1154 unregister_filesystem(&cifs_fs_type);
1155 cifs_destroy_inodecache();
1156 cifs_destroy_mids();
1157 cifs_destroy_request_bufs();
1158 kthread_stop(oplockThread);
1161 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1162 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1164 ("VFS to access servers complying with the SNIA CIFS Specification "
1165 "e.g. Samba and Windows");
1166 MODULE_VERSION(CIFS_VERSION);
1167 module_init(init_cifs)
1168 module_exit(exit_cifs)