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 const 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 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"));
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);
226 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
228 struct super_block *sb = dentry->d_sb;
229 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
230 struct cifsTconInfo *tcon = cifs_sb->tcon;
231 int rc = -EOPNOTSUPP;
236 buf->f_type = CIFS_MAGIC_NUMBER;
239 * PATH_MAX may be too long - it would presumably be total path,
240 * but note that some servers (includinng Samba 3) have a shorter
243 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
245 buf->f_namelen = PATH_MAX;
246 buf->f_files = 0; /* undefined */
247 buf->f_ffree = 0; /* unlimited */
250 * We could add a second check for a QFS Unix capability bit
252 if ((tcon->ses->capabilities & CAP_UNIX) &&
253 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
254 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
257 * Only need to call the old QFSInfo if failed on newer one,
260 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
261 rc = CIFSSMBQFSInfo(xid, tcon, buf);
264 * Some old Windows servers also do not support level 103, retry with
265 * older level one if old server failed the previous call or we
266 * bypassed it because we detected that this was an older LANMAN sess
269 rc = SMBOldQFSInfo(xid, tcon, buf);
275 static int cifs_permission(struct inode *inode, int mask)
277 struct cifs_sb_info *cifs_sb;
279 cifs_sb = CIFS_SB(inode->i_sb);
281 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
282 if ((mask & MAY_EXEC) && !execute_ok(inode))
286 } else /* file mode might have been restricted at mount time
287 on the client (above and beyond ACL on servers) for
288 servers which do not support setting and viewing mode bits,
289 so allowing client to check permissions is useful */
290 return generic_permission(inode, mask, NULL);
293 static struct kmem_cache *cifs_inode_cachep;
294 static struct kmem_cache *cifs_req_cachep;
295 static struct kmem_cache *cifs_mid_cachep;
296 struct kmem_cache *cifs_oplock_cachep;
297 static struct kmem_cache *cifs_sm_req_cachep;
298 mempool_t *cifs_sm_req_poolp;
299 mempool_t *cifs_req_poolp;
300 mempool_t *cifs_mid_poolp;
302 static struct inode *
303 cifs_alloc_inode(struct super_block *sb)
305 struct cifsInodeInfo *cifs_inode;
306 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
309 cifs_inode->cifsAttrs = 0x20; /* default */
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 */
319 cifs_inode->server_eof = 0;
321 /* Can not set i_flags here - they get immediately overwritten
322 to zero by the VFS */
323 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
324 INIT_LIST_HEAD(&cifs_inode->openFileList);
325 return &cifs_inode->vfs_inode;
329 cifs_destroy_inode(struct inode *inode)
331 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
335 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
337 seq_printf(s, ",addr=");
339 switch (server->addr.sockAddr.sin_family) {
341 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
344 seq_printf(s, "%pI6",
345 &server->addr.sockAddr6.sin6_addr.s6_addr);
346 if (server->addr.sockAddr6.sin6_scope_id)
347 seq_printf(s, "%%%u",
348 server->addr.sockAddr6.sin6_scope_id);
351 seq_printf(s, "(unknown)");
356 * cifs_show_options() is for displaying mount options in /proc/mounts.
357 * Not all settable options are displayed but most of the important
361 cifs_show_options(struct seq_file *s, struct vfsmount *m)
363 struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
364 struct cifsTconInfo *tcon = cifs_sb->tcon;
366 seq_printf(s, ",unc=%s", tcon->treeName);
367 if (tcon->ses->userName)
368 seq_printf(s, ",username=%s", tcon->ses->userName);
369 if (tcon->ses->domainName)
370 seq_printf(s, ",domain=%s", tcon->ses->domainName);
372 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
373 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
374 seq_printf(s, ",forceuid");
376 seq_printf(s, ",noforceuid");
378 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
379 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
380 seq_printf(s, ",forcegid");
382 seq_printf(s, ",noforcegid");
384 cifs_show_address(s, tcon->ses->server);
387 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
388 cifs_sb->mnt_file_mode,
389 cifs_sb->mnt_dir_mode);
391 seq_printf(s, ",seal");
393 seq_printf(s, ",nocase");
395 seq_printf(s, ",hard");
396 if (cifs_sb->prepath)
397 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
398 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
399 seq_printf(s, ",posixpaths");
400 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
401 seq_printf(s, ",setuids");
402 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
403 seq_printf(s, ",serverino");
404 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
405 seq_printf(s, ",directio");
406 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
407 seq_printf(s, ",nouser_xattr");
408 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
409 seq_printf(s, ",mapchars");
410 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
411 seq_printf(s, ",sfu");
412 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
413 seq_printf(s, ",nobrl");
414 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
415 seq_printf(s, ",cifsacl");
416 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
417 seq_printf(s, ",dynperm");
418 if (m->mnt_sb->s_flags & MS_POSIXACL)
419 seq_printf(s, ",acl");
421 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
422 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
427 #ifdef CONFIG_CIFS_QUOTA
428 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
429 struct fs_disk_quota *pdquota)
433 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
434 struct cifsTconInfo *pTcon;
437 pTcon = cifs_sb->tcon;
444 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
452 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
453 struct fs_disk_quota *pdquota)
457 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
458 struct cifsTconInfo *pTcon;
461 pTcon = cifs_sb->tcon;
467 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
475 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
479 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
480 struct cifsTconInfo *pTcon;
483 pTcon = cifs_sb->tcon;
489 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
497 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
501 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
502 struct cifsTconInfo *pTcon;
505 pTcon = cifs_sb->tcon;
511 cFYI(1, ("pqstats %p", qstats));
519 static const struct quotactl_ops cifs_quotactl_ops = {
520 .set_xquota = cifs_xquota_set,
521 .get_xquota = cifs_xquota_get,
522 .set_xstate = cifs_xstate_set,
523 .get_xstate = cifs_xstate_get,
527 static void cifs_umount_begin(struct super_block *sb)
529 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
530 struct cifsTconInfo *tcon;
535 tcon = cifs_sb->tcon;
539 read_lock(&cifs_tcp_ses_lock);
540 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
541 /* we have other mounts to same share or we have
542 already tried to force umount this and woken up
543 all waiting network requests, nothing to do */
544 read_unlock(&cifs_tcp_ses_lock);
546 } else if (tcon->tc_count == 1)
547 tcon->tidStatus = CifsExiting;
548 read_unlock(&cifs_tcp_ses_lock);
550 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
551 /* cancel_notify_requests(tcon); */
552 if (tcon->ses && tcon->ses->server) {
553 cFYI(1, ("wake up tasks now - umount begin not complete"));
554 wake_up_all(&tcon->ses->server->request_q);
555 wake_up_all(&tcon->ses->server->response_q);
556 msleep(1); /* yield */
557 /* we have to kick the requests once more */
558 wake_up_all(&tcon->ses->server->response_q);
565 #ifdef CONFIG_CIFS_STATS2
566 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
573 static int cifs_remount(struct super_block *sb, int *flags, char *data)
575 *flags |= MS_NODIRATIME;
579 static const struct super_operations cifs_super_ops = {
580 .put_super = cifs_put_super,
581 .statfs = cifs_statfs,
582 .alloc_inode = cifs_alloc_inode,
583 .destroy_inode = cifs_destroy_inode,
584 /* .drop_inode = generic_delete_inode,
585 .delete_inode = cifs_delete_inode, */ /* Do not need above two
586 functions unless later we add lazy close of inodes or unless the
587 kernel forgets to call us with the same number of releases (closes)
589 .show_options = cifs_show_options,
590 .umount_begin = cifs_umount_begin,
591 .remount_fs = cifs_remount,
592 #ifdef CONFIG_CIFS_STATS2
593 .show_stats = cifs_show_stats,
598 cifs_get_sb(struct file_system_type *fs_type,
599 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
602 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
604 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
611 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
613 deactivate_locked_super(sb);
616 sb->s_flags |= MS_ACTIVE;
617 simple_set_mnt(mnt, sb);
621 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
622 unsigned long nr_segs, loff_t pos)
624 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
627 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
628 if (!CIFS_I(inode)->clientCanCacheAll)
629 filemap_fdatawrite(inode->i_mapping);
633 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
635 /* origin == SEEK_END => we must revalidate the cached file length */
636 if (origin == SEEK_END) {
639 /* some applications poll for the file length in this strange
640 way so we must seek to end on non-oplocked files by
641 setting the revalidate time to zero */
642 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
644 retval = cifs_revalidate(file->f_path.dentry);
646 return (loff_t)retval;
648 return generic_file_llseek_unlocked(file, offset, origin);
651 #ifdef CONFIG_CIFS_EXPERIMENTAL
652 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
654 /* note that this is called by vfs setlease with the BKL held
655 although I doubt that BKL is needed here in cifs */
656 struct inode *inode = file->f_path.dentry->d_inode;
658 if (!(S_ISREG(inode->i_mode)))
661 /* check if file is oplocked */
662 if (((arg == F_RDLCK) &&
663 (CIFS_I(inode)->clientCanCacheRead)) ||
665 (CIFS_I(inode)->clientCanCacheAll)))
666 return generic_setlease(file, arg, lease);
667 else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
668 !CIFS_I(inode)->clientCanCacheRead)
669 /* If the server claims to support oplock on this
670 file, then we still need to check oplock even
671 if the local_lease mount option is set, but there
672 are servers which do not support oplock for which
673 this mount option may be useful if the user
674 knows that the file won't be changed on the server
676 return generic_setlease(file, arg, lease);
682 struct file_system_type cifs_fs_type = {
683 .owner = THIS_MODULE,
685 .get_sb = cifs_get_sb,
686 .kill_sb = kill_anon_super,
689 const struct inode_operations cifs_dir_inode_ops = {
690 .create = cifs_create,
691 .lookup = cifs_lookup,
692 .getattr = cifs_getattr,
693 .unlink = cifs_unlink,
694 .link = cifs_hardlink,
697 .rename = cifs_rename,
698 .permission = cifs_permission,
699 /* revalidate:cifs_revalidate, */
700 .setattr = cifs_setattr,
701 .symlink = cifs_symlink,
703 #ifdef CONFIG_CIFS_XATTR
704 .setxattr = cifs_setxattr,
705 .getxattr = cifs_getxattr,
706 .listxattr = cifs_listxattr,
707 .removexattr = cifs_removexattr,
711 const struct inode_operations cifs_file_inode_ops = {
712 /* revalidate:cifs_revalidate, */
713 .setattr = cifs_setattr,
714 .getattr = cifs_getattr, /* do we need this anymore? */
715 .rename = cifs_rename,
716 .permission = cifs_permission,
717 #ifdef CONFIG_CIFS_XATTR
718 .setxattr = cifs_setxattr,
719 .getxattr = cifs_getxattr,
720 .listxattr = cifs_listxattr,
721 .removexattr = cifs_removexattr,
725 const struct inode_operations cifs_symlink_inode_ops = {
726 .readlink = generic_readlink,
727 .follow_link = cifs_follow_link,
728 .put_link = cifs_put_link,
729 .permission = cifs_permission,
730 /* BB add the following two eventually */
731 /* revalidate: cifs_revalidate,
732 setattr: cifs_notify_change, *//* BB do we need notify change */
733 #ifdef CONFIG_CIFS_XATTR
734 .setxattr = cifs_setxattr,
735 .getxattr = cifs_getxattr,
736 .listxattr = cifs_listxattr,
737 .removexattr = cifs_removexattr,
741 const struct file_operations cifs_file_ops = {
742 .read = do_sync_read,
743 .write = do_sync_write,
744 .aio_read = generic_file_aio_read,
745 .aio_write = cifs_file_aio_write,
747 .release = cifs_close,
751 .mmap = cifs_file_mmap,
752 .splice_read = generic_file_splice_read,
753 .llseek = cifs_llseek,
754 #ifdef CONFIG_CIFS_POSIX
755 .unlocked_ioctl = cifs_ioctl,
756 #endif /* CONFIG_CIFS_POSIX */
758 #ifdef CONFIG_CIFS_EXPERIMENTAL
759 .setlease = cifs_setlease,
760 #endif /* CONFIG_CIFS_EXPERIMENTAL */
763 const struct file_operations cifs_file_direct_ops = {
764 /* no mmap, no aio, no readv -
765 BB reevaluate whether they can be done with directio, no cache */
766 .read = cifs_user_read,
767 .write = cifs_user_write,
769 .release = cifs_close,
773 .splice_read = generic_file_splice_read,
774 #ifdef CONFIG_CIFS_POSIX
775 .unlocked_ioctl = cifs_ioctl,
776 #endif /* CONFIG_CIFS_POSIX */
777 .llseek = cifs_llseek,
778 #ifdef CONFIG_CIFS_EXPERIMENTAL
779 .setlease = cifs_setlease,
780 #endif /* CONFIG_CIFS_EXPERIMENTAL */
782 const struct file_operations cifs_file_nobrl_ops = {
783 .read = do_sync_read,
784 .write = do_sync_write,
785 .aio_read = generic_file_aio_read,
786 .aio_write = cifs_file_aio_write,
788 .release = cifs_close,
791 .mmap = cifs_file_mmap,
792 .splice_read = generic_file_splice_read,
793 .llseek = cifs_llseek,
794 #ifdef CONFIG_CIFS_POSIX
795 .unlocked_ioctl = cifs_ioctl,
796 #endif /* CONFIG_CIFS_POSIX */
798 #ifdef CONFIG_CIFS_EXPERIMENTAL
799 .setlease = cifs_setlease,
800 #endif /* CONFIG_CIFS_EXPERIMENTAL */
803 const struct file_operations cifs_file_direct_nobrl_ops = {
804 /* no mmap, no aio, no readv -
805 BB reevaluate whether they can be done with directio, no cache */
806 .read = cifs_user_read,
807 .write = cifs_user_write,
809 .release = cifs_close,
812 .splice_read = generic_file_splice_read,
813 #ifdef CONFIG_CIFS_POSIX
814 .unlocked_ioctl = cifs_ioctl,
815 #endif /* CONFIG_CIFS_POSIX */
816 .llseek = cifs_llseek,
817 #ifdef CONFIG_CIFS_EXPERIMENTAL
818 .setlease = cifs_setlease,
819 #endif /* CONFIG_CIFS_EXPERIMENTAL */
822 const struct file_operations cifs_dir_ops = {
823 .readdir = cifs_readdir,
824 .release = cifs_closedir,
825 .read = generic_read_dir,
826 .unlocked_ioctl = cifs_ioctl,
827 .llseek = generic_file_llseek,
831 cifs_init_once(void *inode)
833 struct cifsInodeInfo *cifsi = inode;
835 inode_init_once(&cifsi->vfs_inode);
836 INIT_LIST_HEAD(&cifsi->lockList);
840 cifs_init_inodecache(void)
842 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
843 sizeof(struct cifsInodeInfo),
844 0, (SLAB_RECLAIM_ACCOUNT|
847 if (cifs_inode_cachep == NULL)
854 cifs_destroy_inodecache(void)
856 kmem_cache_destroy(cifs_inode_cachep);
860 cifs_init_request_bufs(void)
862 if (CIFSMaxBufSize < 8192) {
863 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
864 Unicode path name has to fit in any SMB/CIFS path based frames */
865 CIFSMaxBufSize = 8192;
866 } else if (CIFSMaxBufSize > 1024*127) {
867 CIFSMaxBufSize = 1024 * 127;
869 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
871 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
872 cifs_req_cachep = kmem_cache_create("cifs_request",
874 MAX_CIFS_HDR_SIZE, 0,
875 SLAB_HWCACHE_ALIGN, NULL);
876 if (cifs_req_cachep == NULL)
879 if (cifs_min_rcv < 1)
881 else if (cifs_min_rcv > 64) {
883 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
886 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
889 if (cifs_req_poolp == NULL) {
890 kmem_cache_destroy(cifs_req_cachep);
893 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
894 almost all handle based requests (but not write response, nor is it
895 sufficient for path based requests). A smaller size would have
896 been more efficient (compacting multiple slab items on one 4k page)
897 for the case in which debug was on, but this larger size allows
898 more SMBs to use small buffer alloc and is still much more
899 efficient to alloc 1 per page off the slab compared to 17K (5page)
900 alloc of large cifs buffers even when page debugging is on */
901 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
902 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
904 if (cifs_sm_req_cachep == NULL) {
905 mempool_destroy(cifs_req_poolp);
906 kmem_cache_destroy(cifs_req_cachep);
910 if (cifs_min_small < 2)
912 else if (cifs_min_small > 256) {
913 cifs_min_small = 256;
914 cFYI(1, ("cifs_min_small set to maximum (256)"));
917 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
920 if (cifs_sm_req_poolp == NULL) {
921 mempool_destroy(cifs_req_poolp);
922 kmem_cache_destroy(cifs_req_cachep);
923 kmem_cache_destroy(cifs_sm_req_cachep);
931 cifs_destroy_request_bufs(void)
933 mempool_destroy(cifs_req_poolp);
934 kmem_cache_destroy(cifs_req_cachep);
935 mempool_destroy(cifs_sm_req_poolp);
936 kmem_cache_destroy(cifs_sm_req_cachep);
942 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
943 sizeof(struct mid_q_entry), 0,
944 SLAB_HWCACHE_ALIGN, NULL);
945 if (cifs_mid_cachep == NULL)
948 /* 3 is a reasonable minimum number of simultaneous operations */
949 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
950 if (cifs_mid_poolp == NULL) {
951 kmem_cache_destroy(cifs_mid_cachep);
955 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
956 sizeof(struct oplock_q_entry), 0,
957 SLAB_HWCACHE_ALIGN, NULL);
958 if (cifs_oplock_cachep == NULL) {
959 mempool_destroy(cifs_mid_poolp);
960 kmem_cache_destroy(cifs_mid_cachep);
968 cifs_destroy_mids(void)
970 mempool_destroy(cifs_mid_poolp);
971 kmem_cache_destroy(cifs_mid_cachep);
972 kmem_cache_destroy(cifs_oplock_cachep);
975 static int cifs_oplock_thread(void *dummyarg)
977 struct oplock_q_entry *oplock_item;
978 struct cifsTconInfo *pTcon;
988 spin_lock(&cifs_oplock_lock);
989 if (list_empty(&cifs_oplock_list)) {
990 spin_unlock(&cifs_oplock_lock);
991 set_current_state(TASK_INTERRUPTIBLE);
992 schedule_timeout(39*HZ);
994 oplock_item = list_entry(cifs_oplock_list.next,
995 struct oplock_q_entry, qhead);
996 cFYI(1, ("found oplock item to write out"));
997 pTcon = oplock_item->tcon;
998 inode = oplock_item->pinode;
999 netfid = oplock_item->netfid;
1000 spin_unlock(&cifs_oplock_lock);
1001 DeleteOplockQEntry(oplock_item);
1002 /* can not grab inode sem here since it would
1003 deadlock when oplock received on delete
1004 since vfs_unlink holds the i_mutex across
1006 /* mutex_lock(&inode->i_mutex);*/
1007 if (S_ISREG(inode->i_mode)) {
1008 #ifdef CONFIG_CIFS_EXPERIMENTAL
1009 if (CIFS_I(inode)->clientCanCacheAll == 0)
1010 break_lease(inode, FMODE_READ);
1011 else if (CIFS_I(inode)->clientCanCacheRead == 0)
1012 break_lease(inode, FMODE_WRITE);
1014 rc = filemap_fdatawrite(inode->i_mapping);
1015 if (CIFS_I(inode)->clientCanCacheRead == 0) {
1016 waitrc = filemap_fdatawait(
1018 invalidate_remote_inode(inode);
1024 /* mutex_unlock(&inode->i_mutex);*/
1026 CIFS_I(inode)->write_behind_rc = rc;
1027 cFYI(1, ("Oplock flush inode %p rc %d",
1030 /* releasing stale oplock after recent reconnect
1031 of smb session using a now incorrect file
1032 handle is not a data integrity issue but do
1033 not bother sending an oplock release if session
1034 to server still is disconnected since oplock
1035 already released by the server in that case */
1036 if (!pTcon->need_reconnect) {
1037 rc = CIFSSMBLock(0, pTcon, netfid,
1038 0 /* len */ , 0 /* offset */, 0,
1039 0, LOCKING_ANDX_OPLOCK_RELEASE,
1040 false /* wait flag */);
1041 cFYI(1, ("Oplock release rc = %d", rc));
1043 set_current_state(TASK_INTERRUPTIBLE);
1044 schedule_timeout(1); /* yield in case q were corrupt */
1046 } while (!kthread_should_stop());
1056 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1057 INIT_LIST_HEAD(&cifs_oplock_list);
1058 #ifdef CONFIG_CIFS_EXPERIMENTAL
1059 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1060 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1063 * Initialize Global counters
1065 atomic_set(&sesInfoAllocCount, 0);
1066 atomic_set(&tconInfoAllocCount, 0);
1067 atomic_set(&tcpSesAllocCount, 0);
1068 atomic_set(&tcpSesReconnectCount, 0);
1069 atomic_set(&tconInfoReconnectCount, 0);
1071 atomic_set(&bufAllocCount, 0);
1072 atomic_set(&smBufAllocCount, 0);
1073 #ifdef CONFIG_CIFS_STATS2
1074 atomic_set(&totBufAllocCount, 0);
1075 atomic_set(&totSmBufAllocCount, 0);
1076 #endif /* CONFIG_CIFS_STATS2 */
1078 atomic_set(&midCount, 0);
1079 GlobalCurrentXid = 0;
1080 GlobalTotalActiveXid = 0;
1081 GlobalMaxActiveXid = 0;
1082 memset(Local_System_Name, 0, 15);
1083 rwlock_init(&GlobalSMBSeslock);
1084 rwlock_init(&cifs_tcp_ses_lock);
1085 spin_lock_init(&GlobalMid_Lock);
1086 spin_lock_init(&cifs_oplock_lock);
1088 if (cifs_max_pending < 2) {
1089 cifs_max_pending = 2;
1090 cFYI(1, ("cifs_max_pending set to min of 2"));
1091 } else if (cifs_max_pending > 256) {
1092 cifs_max_pending = 256;
1093 cFYI(1, ("cifs_max_pending set to max of 256"));
1096 rc = cifs_init_inodecache();
1098 goto out_clean_proc;
1100 rc = cifs_init_mids();
1102 goto out_destroy_inodecache;
1104 rc = cifs_init_request_bufs();
1106 goto out_destroy_mids;
1108 rc = register_filesystem(&cifs_fs_type);
1110 goto out_destroy_request_bufs;
1111 #ifdef CONFIG_CIFS_UPCALL
1112 rc = register_key_type(&cifs_spnego_key_type);
1114 goto out_unregister_filesystem;
1116 #ifdef CONFIG_CIFS_DFS_UPCALL
1117 rc = register_key_type(&key_type_dns_resolver);
1119 goto out_unregister_key_type;
1121 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1122 if (IS_ERR(oplockThread)) {
1123 rc = PTR_ERR(oplockThread);
1124 cERROR(1, ("error %d create oplock thread", rc));
1125 goto out_unregister_dfs_key_type;
1130 out_unregister_dfs_key_type:
1131 #ifdef CONFIG_CIFS_DFS_UPCALL
1132 unregister_key_type(&key_type_dns_resolver);
1133 out_unregister_key_type:
1135 #ifdef CONFIG_CIFS_UPCALL
1136 unregister_key_type(&cifs_spnego_key_type);
1137 out_unregister_filesystem:
1139 unregister_filesystem(&cifs_fs_type);
1140 out_destroy_request_bufs:
1141 cifs_destroy_request_bufs();
1143 cifs_destroy_mids();
1144 out_destroy_inodecache:
1145 cifs_destroy_inodecache();
1154 cFYI(DBG2, ("exit_cifs"));
1156 #ifdef CONFIG_CIFS_DFS_UPCALL
1157 cifs_dfs_release_automount_timer();
1158 unregister_key_type(&key_type_dns_resolver);
1160 #ifdef CONFIG_CIFS_UPCALL
1161 unregister_key_type(&cifs_spnego_key_type);
1163 unregister_filesystem(&cifs_fs_type);
1164 cifs_destroy_inodecache();
1165 cifs_destroy_mids();
1166 cifs_destroy_request_bufs();
1167 kthread_stop(oplockThread);
1170 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1171 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1173 ("VFS to access servers complying with the SNIA CIFS Specification "
1174 "e.g. Samba and Windows");
1175 MODULE_VERSION(CIFS_VERSION);
1176 module_init(init_cifs)
1177 module_exit(exit_cifs)