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 #ifdef CONFIG_CIFS_EXPERIMENTAL
70 static struct task_struct *dnotifyThread = NULL;
72 static const struct super_operations cifs_super_ops;
73 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
74 module_param(CIFSMaxBufSize, int, 0);
75 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
76 "Default: 16384 Range: 8192 to 130048");
77 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
78 module_param(cifs_min_rcv, int, 0);
79 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
81 unsigned int cifs_min_small = 30;
82 module_param(cifs_min_small, int, 0);
83 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
85 unsigned int cifs_max_pending = CIFS_MAX_REQ;
86 module_param(cifs_max_pending, int, 0);
87 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
88 "Default: 50 Range: 2 to 256");
90 extern mempool_t *cifs_sm_req_poolp;
91 extern mempool_t *cifs_req_poolp;
92 extern mempool_t *cifs_mid_poolp;
94 extern struct kmem_cache *cifs_oplock_cachep;
97 cifs_read_super(struct super_block *sb, void *data,
98 const char *devname, int silent)
101 struct cifs_sb_info *cifs_sb;
104 /* BB should we make this contingent on mount parm? */
105 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
106 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
107 cifs_sb = CIFS_SB(sb);
111 #ifdef CONFIG_CIFS_DFS_UPCALL
112 /* copy mount params to sb for use in submounts */
113 /* BB: should we move this after the mount so we
114 * do not have to do the copy on failed mounts?
115 * BB: May be it is better to do simple copy before
116 * complex operation (mount), and in case of fail
117 * just exit instead of doing mount and attempting
118 * undo it if this copy fails?*/
120 int len = strlen(data);
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';
132 rc = cifs_mount(sb, cifs_sb, data, devname);
137 ("cifs_mount failed w/return code = %d", rc));
138 goto out_mount_failed;
141 sb->s_magic = CIFS_MAGIC_NUMBER;
142 sb->s_op = &cifs_super_ops;
143 /* if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
145 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
146 #ifdef CONFIG_CIFS_QUOTA
147 sb->s_qcop = &cifs_quotactl_ops;
149 sb->s_blocksize = CIFS_MAX_MSGSIZE;
150 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
151 inode = cifs_iget(sb, ROOT_I);
159 sb->s_root = d_alloc_root(inode);
166 #ifdef CONFIG_CIFS_EXPERIMENTAL
167 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
168 cFYI(1, ("export ops supported"));
169 sb->s_export_op = &cifs_export_ops;
171 #endif /* EXPERIMENTAL */
176 cERROR(1, ("cifs_read_super: get root inode failed"));
180 cifs_umount(sb, cifs_sb);
184 #ifdef CONFIG_CIFS_DFS_UPCALL
185 if (cifs_sb->mountdata) {
186 kfree(cifs_sb->mountdata);
187 cifs_sb->mountdata = NULL;
190 if (cifs_sb->local_nls)
191 unload_nls(cifs_sb->local_nls);
198 cifs_put_super(struct super_block *sb)
201 struct cifs_sb_info *cifs_sb;
203 cFYI(1, ("In cifs_put_super"));
204 cifs_sb = CIFS_SB(sb);
205 if (cifs_sb == NULL) {
206 cFYI(1, ("Empty cifs superblock info passed to unmount"));
209 rc = cifs_umount(sb, cifs_sb);
211 cERROR(1, ("cifs_umount failed with return code %d", rc));
212 #ifdef CONFIG_CIFS_DFS_UPCALL
213 if (cifs_sb->mountdata) {
214 kfree(cifs_sb->mountdata);
215 cifs_sb->mountdata = NULL;
219 unload_nls(cifs_sb->local_nls);
225 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
227 struct super_block *sb = dentry->d_sb;
228 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
229 struct cifsTconInfo *tcon = cifs_sb->tcon;
230 int rc = -EOPNOTSUPP;
235 buf->f_type = CIFS_MAGIC_NUMBER;
238 * PATH_MAX may be too long - it would presumably be total path,
239 * but note that some servers (includinng Samba 3) have a shorter
242 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
244 buf->f_namelen = PATH_MAX;
245 buf->f_files = 0; /* undefined */
246 buf->f_ffree = 0; /* unlimited */
249 * We could add a second check for a QFS Unix capability bit
251 if ((tcon->ses->capabilities & CAP_UNIX) &&
252 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
253 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
256 * Only need to call the old QFSInfo if failed on newer one,
259 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
260 rc = CIFSSMBQFSInfo(xid, tcon, buf);
263 * Some old Windows servers also do not support level 103, retry with
264 * older level one if old server failed the previous call or we
265 * bypassed it because we detected that this was an older LANMAN sess
268 rc = SMBOldQFSInfo(xid, tcon, buf);
274 static int cifs_permission(struct inode *inode, int mask)
276 struct cifs_sb_info *cifs_sb;
278 cifs_sb = CIFS_SB(inode->i_sb);
280 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
281 if ((mask & MAY_EXEC) && !execute_ok(inode))
285 } else /* file mode might have been restricted at mount time
286 on the client (above and beyond ACL on servers) for
287 servers which do not support setting and viewing mode bits,
288 so allowing client to check permissions is useful */
289 return generic_permission(inode, mask, NULL);
292 static struct kmem_cache *cifs_inode_cachep;
293 static struct kmem_cache *cifs_req_cachep;
294 static struct kmem_cache *cifs_mid_cachep;
295 struct kmem_cache *cifs_oplock_cachep;
296 static struct kmem_cache *cifs_sm_req_cachep;
297 mempool_t *cifs_sm_req_poolp;
298 mempool_t *cifs_req_poolp;
299 mempool_t *cifs_mid_poolp;
301 static struct inode *
302 cifs_alloc_inode(struct super_block *sb)
304 struct cifsInodeInfo *cifs_inode;
305 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
308 cifs_inode->cifsAttrs = 0x20; /* default */
309 atomic_set(&cifs_inode->inUse, 0);
310 cifs_inode->time = 0;
311 cifs_inode->write_behind_rc = 0;
312 /* Until the file is open and we have gotten oplock
313 info back from the server, can not assume caching of
314 file data or metadata */
315 cifs_inode->clientCanCacheRead = false;
316 cifs_inode->clientCanCacheAll = false;
317 cifs_inode->delete_pending = false;
318 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
320 /* Can not set i_flags here - they get immediately overwritten
321 to zero by the VFS */
322 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
323 INIT_LIST_HEAD(&cifs_inode->openFileList);
324 return &cifs_inode->vfs_inode;
328 cifs_destroy_inode(struct inode *inode)
330 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
334 * cifs_show_options() is for displaying mount options in /proc/mounts.
335 * Not all settable options are displayed but most of the important
339 cifs_show_options(struct seq_file *s, struct vfsmount *m)
341 struct cifs_sb_info *cifs_sb;
342 struct cifsTconInfo *tcon;
343 struct TCP_Server_Info *server;
345 cifs_sb = CIFS_SB(m->mnt_sb);
348 tcon = cifs_sb->tcon;
350 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
352 if (tcon->ses->userName)
353 seq_printf(s, ",username=%s",
354 tcon->ses->userName);
355 if (tcon->ses->domainName)
356 seq_printf(s, ",domain=%s",
357 tcon->ses->domainName);
358 server = tcon->ses->server;
360 seq_printf(s, ",addr=");
361 switch (server->addr.sockAddr6.
364 seq_printf(s, "%pI6",
365 &server->addr.sockAddr6.sin6_addr);
368 seq_printf(s, "%pI4",
369 &server->addr.sockAddr.sin_addr.s_addr);
374 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
376 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
377 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
379 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
380 if (!tcon->unix_ext) {
381 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
382 cifs_sb->mnt_file_mode,
383 cifs_sb->mnt_dir_mode);
386 seq_printf(s, ",seal");
388 seq_printf(s, ",nocase");
390 seq_printf(s, ",hard");
392 if (cifs_sb->prepath)
393 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
394 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
395 seq_printf(s, ",posixpaths");
396 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
397 seq_printf(s, ",setuids");
398 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
399 seq_printf(s, ",serverino");
400 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
401 seq_printf(s, ",directio");
402 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
403 seq_printf(s, ",nouser_xattr");
404 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
405 seq_printf(s, ",mapchars");
406 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
407 seq_printf(s, ",sfu");
408 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
409 seq_printf(s, ",nobrl");
410 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
411 seq_printf(s, ",cifsacl");
412 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
413 seq_printf(s, ",dynperm");
414 if (m->mnt_sb->s_flags & MS_POSIXACL)
415 seq_printf(s, ",acl");
417 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
418 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
423 #ifdef CONFIG_CIFS_QUOTA
424 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
425 struct fs_disk_quota *pdquota)
429 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
430 struct cifsTconInfo *pTcon;
433 pTcon = cifs_sb->tcon;
440 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
448 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
449 struct fs_disk_quota *pdquota)
453 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
454 struct cifsTconInfo *pTcon;
457 pTcon = cifs_sb->tcon;
463 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
471 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
475 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
476 struct cifsTconInfo *pTcon;
479 pTcon = cifs_sb->tcon;
485 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
493 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
497 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
498 struct cifsTconInfo *pTcon;
501 pTcon = cifs_sb->tcon;
507 cFYI(1, ("pqstats %p", qstats));
515 static struct quotactl_ops cifs_quotactl_ops = {
516 .set_xquota = cifs_xquota_set,
517 .get_xquota = cifs_xquota_get,
518 .set_xstate = cifs_xstate_set,
519 .get_xstate = cifs_xstate_get,
523 static void cifs_umount_begin(struct super_block *sb)
525 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
526 struct cifsTconInfo *tcon;
531 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 */
556 #ifdef CONFIG_CIFS_STATS2
557 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
564 static int cifs_remount(struct super_block *sb, int *flags, char *data)
566 *flags |= MS_NODIRATIME;
570 static const struct super_operations cifs_super_ops = {
571 .put_super = cifs_put_super,
572 .statfs = cifs_statfs,
573 .alloc_inode = cifs_alloc_inode,
574 .destroy_inode = cifs_destroy_inode,
575 /* .drop_inode = generic_delete_inode,
576 .delete_inode = cifs_delete_inode, */ /* Do not need above two
577 functions unless later we add lazy close of inodes or unless the
578 kernel forgets to call us with the same number of releases (closes)
580 .show_options = cifs_show_options,
581 .umount_begin = cifs_umount_begin,
582 .remount_fs = cifs_remount,
583 #ifdef CONFIG_CIFS_STATS2
584 .show_stats = cifs_show_stats,
589 cifs_get_sb(struct file_system_type *fs_type,
590 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
593 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
595 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
602 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
604 up_write(&sb->s_umount);
605 deactivate_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());
1043 #ifdef CONFIG_CIFS_EXPERIMENTAL
1044 static int cifs_dnotify_thread(void *dummyarg)
1046 struct list_head *tmp;
1047 struct TCP_Server_Info *server;
1050 if (try_to_freeze())
1052 set_current_state(TASK_INTERRUPTIBLE);
1053 schedule_timeout(15*HZ);
1054 /* check if any stuck requests that need
1055 to be woken up and wakeq so the
1056 thread can wake up and error out */
1057 read_lock(&cifs_tcp_ses_lock);
1058 list_for_each(tmp, &cifs_tcp_ses_list) {
1059 server = list_entry(tmp, struct TCP_Server_Info,
1061 if (atomic_read(&server->inFlight))
1062 wake_up_all(&server->response_q);
1064 read_unlock(&cifs_tcp_ses_lock);
1065 } while (!kthread_should_stop());
1076 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1077 INIT_LIST_HEAD(&GlobalOplock_Q);
1078 #ifdef CONFIG_CIFS_EXPERIMENTAL
1079 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1080 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1083 * Initialize Global counters
1085 atomic_set(&sesInfoAllocCount, 0);
1086 atomic_set(&tconInfoAllocCount, 0);
1087 atomic_set(&tcpSesAllocCount, 0);
1088 atomic_set(&tcpSesReconnectCount, 0);
1089 atomic_set(&tconInfoReconnectCount, 0);
1091 atomic_set(&bufAllocCount, 0);
1092 atomic_set(&smBufAllocCount, 0);
1093 #ifdef CONFIG_CIFS_STATS2
1094 atomic_set(&totBufAllocCount, 0);
1095 atomic_set(&totSmBufAllocCount, 0);
1096 #endif /* CONFIG_CIFS_STATS2 */
1098 atomic_set(&midCount, 0);
1099 GlobalCurrentXid = 0;
1100 GlobalTotalActiveXid = 0;
1101 GlobalMaxActiveXid = 0;
1102 memset(Local_System_Name, 0, 15);
1103 rwlock_init(&GlobalSMBSeslock);
1104 rwlock_init(&cifs_tcp_ses_lock);
1105 spin_lock_init(&GlobalMid_Lock);
1107 if (cifs_max_pending < 2) {
1108 cifs_max_pending = 2;
1109 cFYI(1, ("cifs_max_pending set to min of 2"));
1110 } else if (cifs_max_pending > 256) {
1111 cifs_max_pending = 256;
1112 cFYI(1, ("cifs_max_pending set to max of 256"));
1115 rc = cifs_init_inodecache();
1117 goto out_clean_proc;
1119 rc = cifs_init_mids();
1121 goto out_destroy_inodecache;
1123 rc = cifs_init_request_bufs();
1125 goto out_destroy_mids;
1127 rc = register_filesystem(&cifs_fs_type);
1129 goto out_destroy_request_bufs;
1130 #ifdef CONFIG_CIFS_UPCALL
1131 rc = register_key_type(&cifs_spnego_key_type);
1133 goto out_unregister_filesystem;
1135 #ifdef CONFIG_CIFS_DFS_UPCALL
1136 rc = register_key_type(&key_type_dns_resolver);
1138 goto out_unregister_key_type;
1140 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1141 if (IS_ERR(oplockThread)) {
1142 rc = PTR_ERR(oplockThread);
1143 cERROR(1, ("error %d create oplock thread", rc));
1144 goto out_unregister_dfs_key_type;
1147 #ifdef CONFIG_CIFS_EXPERIMENTAL
1148 dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1149 if (IS_ERR(dnotifyThread)) {
1150 rc = PTR_ERR(dnotifyThread);
1151 cERROR(1, ("error %d create dnotify thread", rc));
1152 goto out_stop_oplock_thread;
1158 #ifdef CONFIG_CIFS_EXPERIMENTAL
1159 out_stop_oplock_thread:
1161 kthread_stop(oplockThread);
1162 out_unregister_dfs_key_type:
1163 #ifdef CONFIG_CIFS_DFS_UPCALL
1164 unregister_key_type(&key_type_dns_resolver);
1165 out_unregister_key_type:
1167 #ifdef CONFIG_CIFS_UPCALL
1168 unregister_key_type(&cifs_spnego_key_type);
1169 out_unregister_filesystem:
1171 unregister_filesystem(&cifs_fs_type);
1172 out_destroy_request_bufs:
1173 cifs_destroy_request_bufs();
1175 cifs_destroy_mids();
1176 out_destroy_inodecache:
1177 cifs_destroy_inodecache();
1186 cFYI(DBG2, ("exit_cifs"));
1188 #ifdef CONFIG_CIFS_DFS_UPCALL
1189 cifs_dfs_release_automount_timer();
1190 unregister_key_type(&key_type_dns_resolver);
1192 #ifdef CONFIG_CIFS_UPCALL
1193 unregister_key_type(&cifs_spnego_key_type);
1195 unregister_filesystem(&cifs_fs_type);
1196 cifs_destroy_inodecache();
1197 cifs_destroy_mids();
1198 cifs_destroy_request_bufs();
1199 #ifdef CONFIG_CIFS_EXPERIMENTAL
1200 kthread_stop(dnotifyThread);
1202 kthread_stop(oplockThread);
1205 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1206 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1208 ("VFS to access servers complying with the SNIA CIFS Specification "
1209 "e.g. Samba and Windows");
1210 MODULE_VERSION(CIFS_VERSION);
1211 module_init(init_cifs)
1212 module_exit(exit_cifs)