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"
51 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
56 unsigned int oplockEnabled = 1;
57 unsigned int experimEnabled = 0;
58 unsigned int linuxExtEnabled = 1;
59 unsigned int lookupCacheEnabled = 1;
60 unsigned int multiuser_mount = 0;
61 unsigned int global_secflags = CIFSSEC_DEF;
62 /* unsigned int ntlmv2_support = 0; */
63 unsigned int sign_CIFS_PDUs = 1;
64 static const struct super_operations cifs_super_ops;
65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
66 module_param(CIFSMaxBufSize, int, 0);
67 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
68 "Default: 16384 Range: 8192 to 130048");
69 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
70 module_param(cifs_min_rcv, int, 0);
71 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
73 unsigned int cifs_min_small = 30;
74 module_param(cifs_min_small, int, 0);
75 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
77 unsigned int cifs_max_pending = CIFS_MAX_REQ;
78 module_param(cifs_max_pending, int, 0);
79 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
80 "Default: 50 Range: 2 to 256");
82 extern mempool_t *cifs_sm_req_poolp;
83 extern mempool_t *cifs_req_poolp;
84 extern mempool_t *cifs_mid_poolp;
87 cifs_read_super(struct super_block *sb, void *data,
88 const char *devname, int silent)
91 struct cifs_sb_info *cifs_sb;
94 /* BB should we make this contingent on mount parm? */
95 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
96 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
97 cifs_sb = CIFS_SB(sb);
101 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
107 #ifdef CONFIG_CIFS_DFS_UPCALL
108 /* copy mount params to sb for use in submounts */
109 /* BB: should we move this after the mount so we
110 * do not have to do the copy on failed mounts?
111 * BB: May be it is better to do simple copy before
112 * complex operation (mount), and in case of fail
113 * just exit instead of doing mount and attempting
114 * undo it if this copy fails?*/
116 int len = strlen(data);
117 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
118 if (cifs_sb->mountdata == NULL) {
119 bdi_destroy(&cifs_sb->bdi);
120 kfree(sb->s_fs_info);
121 sb->s_fs_info = NULL;
124 strncpy(cifs_sb->mountdata, data, len + 1);
125 cifs_sb->mountdata[len] = '\0';
129 rc = cifs_mount(sb, cifs_sb, data, devname);
133 cERROR(1, "cifs_mount failed w/return code = %d", rc);
134 goto out_mount_failed;
137 sb->s_magic = CIFS_MAGIC_NUMBER;
138 sb->s_op = &cifs_super_ops;
139 sb->s_bdi = &cifs_sb->bdi;
140 /* if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
142 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
143 sb->s_blocksize = CIFS_MAX_MSGSIZE;
144 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
145 inode = cifs_root_iget(sb, ROOT_I);
153 sb->s_root = d_alloc_root(inode);
160 #ifdef CONFIG_CIFS_EXPERIMENTAL
161 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
162 cFYI(1, "export ops supported");
163 sb->s_export_op = &cifs_export_ops;
165 #endif /* EXPERIMENTAL */
170 cERROR(1, "cifs_read_super: get root inode failed");
174 cifs_umount(sb, cifs_sb);
178 #ifdef CONFIG_CIFS_DFS_UPCALL
179 if (cifs_sb->mountdata) {
180 kfree(cifs_sb->mountdata);
181 cifs_sb->mountdata = NULL;
184 unload_nls(cifs_sb->local_nls);
185 bdi_destroy(&cifs_sb->bdi);
192 cifs_put_super(struct super_block *sb)
195 struct cifs_sb_info *cifs_sb;
197 cFYI(1, "In cifs_put_super");
198 cifs_sb = CIFS_SB(sb);
199 if (cifs_sb == NULL) {
200 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);
217 bdi_destroy(&cifs_sb->bdi);
224 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
226 struct super_block *sb = dentry->d_sb;
227 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
228 struct cifsTconInfo *tcon = cifs_sb->tcon;
229 int rc = -EOPNOTSUPP;
234 buf->f_type = CIFS_MAGIC_NUMBER;
237 * PATH_MAX may be too long - it would presumably be total path,
238 * but note that some servers (includinng Samba 3) have a shorter
241 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
243 buf->f_namelen = PATH_MAX;
244 buf->f_files = 0; /* undefined */
245 buf->f_ffree = 0; /* unlimited */
248 * We could add a second check for a QFS Unix capability bit
250 if ((tcon->ses->capabilities & CAP_UNIX) &&
251 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
252 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
255 * Only need to call the old QFSInfo if failed on newer one,
258 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
259 rc = CIFSSMBQFSInfo(xid, tcon, buf);
262 * Some old Windows servers also do not support level 103, retry with
263 * older level one if old server failed the previous call or we
264 * bypassed it because we detected that this was an older LANMAN sess
267 rc = SMBOldQFSInfo(xid, tcon, buf);
273 static int cifs_permission(struct inode *inode, int mask)
275 struct cifs_sb_info *cifs_sb;
277 cifs_sb = CIFS_SB(inode->i_sb);
279 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
280 if ((mask & MAY_EXEC) && !execute_ok(inode))
284 } else /* file mode might have been restricted at mount time
285 on the client (above and beyond ACL on servers) for
286 servers which do not support setting and viewing mode bits,
287 so allowing client to check permissions is useful */
288 return generic_permission(inode, mask, NULL);
291 static struct kmem_cache *cifs_inode_cachep;
292 static struct kmem_cache *cifs_req_cachep;
293 static struct kmem_cache *cifs_mid_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 cifs_inode->time = 0;
308 cifs_inode->write_behind_rc = 0;
309 /* Until the file is open and we have gotten oplock
310 info back from the server, can not assume caching of
311 file data or metadata */
312 cifs_inode->clientCanCacheRead = false;
313 cifs_inode->clientCanCacheAll = false;
314 cifs_inode->delete_pending = false;
315 cifs_inode->invalid_mapping = 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_clear_inode(struct inode *inode)
335 cifs_fscache_release_inode_cookie(inode);
339 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
341 seq_printf(s, ",addr=");
343 switch (server->addr.sockAddr.sin_family) {
345 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
348 seq_printf(s, "%pI6",
349 &server->addr.sockAddr6.sin6_addr.s6_addr);
350 if (server->addr.sockAddr6.sin6_scope_id)
351 seq_printf(s, "%%%u",
352 server->addr.sockAddr6.sin6_scope_id);
355 seq_printf(s, "(unknown)");
360 * cifs_show_options() is for displaying mount options in /proc/mounts.
361 * Not all settable options are displayed but most of the important
365 cifs_show_options(struct seq_file *s, struct vfsmount *m)
367 struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
368 struct cifsTconInfo *tcon = cifs_sb->tcon;
370 seq_printf(s, ",unc=%s", tcon->treeName);
371 if (tcon->ses->userName)
372 seq_printf(s, ",username=%s", tcon->ses->userName);
373 if (tcon->ses->domainName)
374 seq_printf(s, ",domain=%s", tcon->ses->domainName);
376 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
377 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
378 seq_printf(s, ",forceuid");
380 seq_printf(s, ",noforceuid");
382 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
383 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
384 seq_printf(s, ",forcegid");
386 seq_printf(s, ",noforcegid");
388 cifs_show_address(s, tcon->ses->server);
391 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
392 cifs_sb->mnt_file_mode,
393 cifs_sb->mnt_dir_mode);
395 seq_printf(s, ",seal");
397 seq_printf(s, ",nocase");
399 seq_printf(s, ",hard");
400 if (cifs_sb->prepath)
401 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
402 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
403 seq_printf(s, ",posixpaths");
404 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
405 seq_printf(s, ",setuids");
406 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
407 seq_printf(s, ",serverino");
408 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
409 seq_printf(s, ",directio");
410 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
411 seq_printf(s, ",nouser_xattr");
412 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
413 seq_printf(s, ",mapchars");
414 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
415 seq_printf(s, ",sfu");
416 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
417 seq_printf(s, ",nobrl");
418 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
419 seq_printf(s, ",cifsacl");
420 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
421 seq_printf(s, ",dynperm");
422 if (m->mnt_sb->s_flags & MS_POSIXACL)
423 seq_printf(s, ",acl");
425 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
426 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
431 static void cifs_umount_begin(struct super_block *sb)
433 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
434 struct cifsTconInfo *tcon;
439 tcon = cifs_sb->tcon;
443 read_lock(&cifs_tcp_ses_lock);
444 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
445 /* we have other mounts to same share or we have
446 already tried to force umount this and woken up
447 all waiting network requests, nothing to do */
448 read_unlock(&cifs_tcp_ses_lock);
450 } else if (tcon->tc_count == 1)
451 tcon->tidStatus = CifsExiting;
452 read_unlock(&cifs_tcp_ses_lock);
454 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
455 /* cancel_notify_requests(tcon); */
456 if (tcon->ses && tcon->ses->server) {
457 cFYI(1, "wake up tasks now - umount begin not complete");
458 wake_up_all(&tcon->ses->server->request_q);
459 wake_up_all(&tcon->ses->server->response_q);
460 msleep(1); /* yield */
461 /* we have to kick the requests once more */
462 wake_up_all(&tcon->ses->server->response_q);
469 #ifdef CONFIG_CIFS_STATS2
470 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
477 static int cifs_remount(struct super_block *sb, int *flags, char *data)
479 *flags |= MS_NODIRATIME;
483 void cifs_drop_inode(struct inode *inode)
485 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
487 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
488 return generic_drop_inode(inode);
490 return generic_delete_inode(inode);
493 static const struct super_operations cifs_super_ops = {
494 .put_super = cifs_put_super,
495 .statfs = cifs_statfs,
496 .alloc_inode = cifs_alloc_inode,
497 .destroy_inode = cifs_destroy_inode,
498 .drop_inode = cifs_drop_inode,
499 .clear_inode = cifs_clear_inode,
500 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
501 function unless later we add lazy close of inodes or unless the
502 kernel forgets to call us with the same number of releases (closes)
504 .show_options = cifs_show_options,
505 .umount_begin = cifs_umount_begin,
506 .remount_fs = cifs_remount,
507 #ifdef CONFIG_CIFS_STATS2
508 .show_stats = cifs_show_stats,
513 cifs_get_sb(struct file_system_type *fs_type,
514 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
517 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
519 cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
526 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
528 deactivate_locked_super(sb);
531 sb->s_flags |= MS_ACTIVE;
532 simple_set_mnt(mnt, sb);
536 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
537 unsigned long nr_segs, loff_t pos)
539 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
542 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
543 if (!CIFS_I(inode)->clientCanCacheAll)
544 filemap_fdatawrite(inode->i_mapping);
548 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
550 /* origin == SEEK_END => we must revalidate the cached file length */
551 if (origin == SEEK_END) {
554 /* some applications poll for the file length in this strange
555 way so we must seek to end on non-oplocked files by
556 setting the revalidate time to zero */
557 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
559 retval = cifs_revalidate_file(file);
561 return (loff_t)retval;
563 return generic_file_llseek_unlocked(file, offset, origin);
566 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
568 /* note that this is called by vfs setlease with the BKL held
569 although I doubt that BKL is needed here in cifs */
570 struct inode *inode = file->f_path.dentry->d_inode;
572 if (!(S_ISREG(inode->i_mode)))
575 /* check if file is oplocked */
576 if (((arg == F_RDLCK) &&
577 (CIFS_I(inode)->clientCanCacheRead)) ||
579 (CIFS_I(inode)->clientCanCacheAll)))
580 return generic_setlease(file, arg, lease);
581 else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
582 !CIFS_I(inode)->clientCanCacheRead)
583 /* If the server claims to support oplock on this
584 file, then we still need to check oplock even
585 if the local_lease mount option is set, but there
586 are servers which do not support oplock for which
587 this mount option may be useful if the user
588 knows that the file won't be changed on the server
590 return generic_setlease(file, arg, lease);
595 struct file_system_type cifs_fs_type = {
596 .owner = THIS_MODULE,
598 .get_sb = cifs_get_sb,
599 .kill_sb = kill_anon_super,
602 const struct inode_operations cifs_dir_inode_ops = {
603 .create = cifs_create,
604 .lookup = cifs_lookup,
605 .getattr = cifs_getattr,
606 .unlink = cifs_unlink,
607 .link = cifs_hardlink,
610 .rename = cifs_rename,
611 .permission = cifs_permission,
612 /* revalidate:cifs_revalidate, */
613 .setattr = cifs_setattr,
614 .symlink = cifs_symlink,
616 #ifdef CONFIG_CIFS_XATTR
617 .setxattr = cifs_setxattr,
618 .getxattr = cifs_getxattr,
619 .listxattr = cifs_listxattr,
620 .removexattr = cifs_removexattr,
624 const struct inode_operations cifs_file_inode_ops = {
625 /* revalidate:cifs_revalidate, */
626 .setattr = cifs_setattr,
627 .getattr = cifs_getattr, /* do we need this anymore? */
628 .rename = cifs_rename,
629 .permission = cifs_permission,
630 #ifdef CONFIG_CIFS_XATTR
631 .setxattr = cifs_setxattr,
632 .getxattr = cifs_getxattr,
633 .listxattr = cifs_listxattr,
634 .removexattr = cifs_removexattr,
638 const struct inode_operations cifs_symlink_inode_ops = {
639 .readlink = generic_readlink,
640 .follow_link = cifs_follow_link,
641 .put_link = cifs_put_link,
642 .permission = cifs_permission,
643 /* BB add the following two eventually */
644 /* revalidate: cifs_revalidate,
645 setattr: cifs_notify_change, *//* BB do we need notify change */
646 #ifdef CONFIG_CIFS_XATTR
647 .setxattr = cifs_setxattr,
648 .getxattr = cifs_getxattr,
649 .listxattr = cifs_listxattr,
650 .removexattr = cifs_removexattr,
654 const struct file_operations cifs_file_ops = {
655 .read = do_sync_read,
656 .write = do_sync_write,
657 .aio_read = generic_file_aio_read,
658 .aio_write = cifs_file_aio_write,
660 .release = cifs_close,
664 .mmap = cifs_file_mmap,
665 .splice_read = generic_file_splice_read,
666 .llseek = cifs_llseek,
667 #ifdef CONFIG_CIFS_POSIX
668 .unlocked_ioctl = cifs_ioctl,
669 #endif /* CONFIG_CIFS_POSIX */
670 .setlease = cifs_setlease,
673 const struct file_operations cifs_file_direct_ops = {
674 /* no aio, no readv -
675 BB reevaluate whether they can be done with directio, no cache */
676 .read = cifs_user_read,
677 .write = cifs_user_write,
679 .release = cifs_close,
683 .mmap = cifs_file_mmap,
684 .splice_read = generic_file_splice_read,
685 #ifdef CONFIG_CIFS_POSIX
686 .unlocked_ioctl = cifs_ioctl,
687 #endif /* CONFIG_CIFS_POSIX */
688 .llseek = cifs_llseek,
689 .setlease = cifs_setlease,
691 const struct file_operations cifs_file_nobrl_ops = {
692 .read = do_sync_read,
693 .write = do_sync_write,
694 .aio_read = generic_file_aio_read,
695 .aio_write = cifs_file_aio_write,
697 .release = cifs_close,
700 .mmap = cifs_file_mmap,
701 .splice_read = generic_file_splice_read,
702 .llseek = cifs_llseek,
703 #ifdef CONFIG_CIFS_POSIX
704 .unlocked_ioctl = cifs_ioctl,
705 #endif /* CONFIG_CIFS_POSIX */
706 .setlease = cifs_setlease,
709 const struct file_operations cifs_file_direct_nobrl_ops = {
710 /* no mmap, no aio, no readv -
711 BB reevaluate whether they can be done with directio, no cache */
712 .read = cifs_user_read,
713 .write = cifs_user_write,
715 .release = cifs_close,
718 .mmap = cifs_file_mmap,
719 .splice_read = generic_file_splice_read,
720 #ifdef CONFIG_CIFS_POSIX
721 .unlocked_ioctl = cifs_ioctl,
722 #endif /* CONFIG_CIFS_POSIX */
723 .llseek = cifs_llseek,
724 .setlease = cifs_setlease,
727 const struct file_operations cifs_dir_ops = {
728 .readdir = cifs_readdir,
729 .release = cifs_closedir,
730 .read = generic_read_dir,
731 .unlocked_ioctl = cifs_ioctl,
732 .llseek = generic_file_llseek,
736 cifs_init_once(void *inode)
738 struct cifsInodeInfo *cifsi = inode;
740 inode_init_once(&cifsi->vfs_inode);
741 INIT_LIST_HEAD(&cifsi->lockList);
745 cifs_init_inodecache(void)
747 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
748 sizeof(struct cifsInodeInfo),
749 0, (SLAB_RECLAIM_ACCOUNT|
752 if (cifs_inode_cachep == NULL)
759 cifs_destroy_inodecache(void)
761 kmem_cache_destroy(cifs_inode_cachep);
765 cifs_init_request_bufs(void)
767 if (CIFSMaxBufSize < 8192) {
768 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
769 Unicode path name has to fit in any SMB/CIFS path based frames */
770 CIFSMaxBufSize = 8192;
771 } else if (CIFSMaxBufSize > 1024*127) {
772 CIFSMaxBufSize = 1024 * 127;
774 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
776 /* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
777 cifs_req_cachep = kmem_cache_create("cifs_request",
779 MAX_CIFS_HDR_SIZE, 0,
780 SLAB_HWCACHE_ALIGN, NULL);
781 if (cifs_req_cachep == NULL)
784 if (cifs_min_rcv < 1)
786 else if (cifs_min_rcv > 64) {
788 cERROR(1, "cifs_min_rcv set to maximum (64)");
791 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
794 if (cifs_req_poolp == NULL) {
795 kmem_cache_destroy(cifs_req_cachep);
798 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
799 almost all handle based requests (but not write response, nor is it
800 sufficient for path based requests). A smaller size would have
801 been more efficient (compacting multiple slab items on one 4k page)
802 for the case in which debug was on, but this larger size allows
803 more SMBs to use small buffer alloc and is still much more
804 efficient to alloc 1 per page off the slab compared to 17K (5page)
805 alloc of large cifs buffers even when page debugging is on */
806 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
807 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
809 if (cifs_sm_req_cachep == NULL) {
810 mempool_destroy(cifs_req_poolp);
811 kmem_cache_destroy(cifs_req_cachep);
815 if (cifs_min_small < 2)
817 else if (cifs_min_small > 256) {
818 cifs_min_small = 256;
819 cFYI(1, "cifs_min_small set to maximum (256)");
822 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
825 if (cifs_sm_req_poolp == NULL) {
826 mempool_destroy(cifs_req_poolp);
827 kmem_cache_destroy(cifs_req_cachep);
828 kmem_cache_destroy(cifs_sm_req_cachep);
836 cifs_destroy_request_bufs(void)
838 mempool_destroy(cifs_req_poolp);
839 kmem_cache_destroy(cifs_req_cachep);
840 mempool_destroy(cifs_sm_req_poolp);
841 kmem_cache_destroy(cifs_sm_req_cachep);
847 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
848 sizeof(struct mid_q_entry), 0,
849 SLAB_HWCACHE_ALIGN, NULL);
850 if (cifs_mid_cachep == NULL)
853 /* 3 is a reasonable minimum number of simultaneous operations */
854 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
855 if (cifs_mid_poolp == NULL) {
856 kmem_cache_destroy(cifs_mid_cachep);
864 cifs_destroy_mids(void)
866 mempool_destroy(cifs_mid_poolp);
867 kmem_cache_destroy(cifs_mid_cachep);
875 INIT_LIST_HEAD(&cifs_tcp_ses_list);
876 #ifdef CONFIG_CIFS_EXPERIMENTAL
877 INIT_LIST_HEAD(&GlobalDnotifyReqList);
878 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
881 * Initialize Global counters
883 atomic_set(&sesInfoAllocCount, 0);
884 atomic_set(&tconInfoAllocCount, 0);
885 atomic_set(&tcpSesAllocCount, 0);
886 atomic_set(&tcpSesReconnectCount, 0);
887 atomic_set(&tconInfoReconnectCount, 0);
889 atomic_set(&bufAllocCount, 0);
890 atomic_set(&smBufAllocCount, 0);
891 #ifdef CONFIG_CIFS_STATS2
892 atomic_set(&totBufAllocCount, 0);
893 atomic_set(&totSmBufAllocCount, 0);
894 #endif /* CONFIG_CIFS_STATS2 */
896 atomic_set(&midCount, 0);
897 GlobalCurrentXid = 0;
898 GlobalTotalActiveXid = 0;
899 GlobalMaxActiveXid = 0;
900 memset(Local_System_Name, 0, 15);
901 rwlock_init(&GlobalSMBSeslock);
902 rwlock_init(&cifs_tcp_ses_lock);
903 spin_lock_init(&GlobalMid_Lock);
905 if (cifs_max_pending < 2) {
906 cifs_max_pending = 2;
907 cFYI(1, "cifs_max_pending set to min of 2");
908 } else if (cifs_max_pending > 256) {
909 cifs_max_pending = 256;
910 cFYI(1, "cifs_max_pending set to max of 256");
913 rc = cifs_fscache_register();
917 rc = cifs_init_inodecache();
921 rc = cifs_init_mids();
923 goto out_destroy_inodecache;
925 rc = cifs_init_request_bufs();
927 goto out_destroy_mids;
929 rc = register_filesystem(&cifs_fs_type);
931 goto out_destroy_request_bufs;
932 #ifdef CONFIG_CIFS_UPCALL
933 rc = register_key_type(&cifs_spnego_key_type);
935 goto out_unregister_filesystem;
937 #ifdef CONFIG_CIFS_DFS_UPCALL
938 rc = cifs_init_dns_resolver();
940 goto out_unregister_key_type;
942 rc = slow_work_register_user(THIS_MODULE);
944 goto out_unregister_resolver_key;
948 out_unregister_resolver_key:
949 #ifdef CONFIG_CIFS_DFS_UPCALL
950 cifs_exit_dns_resolver();
951 out_unregister_key_type:
953 #ifdef CONFIG_CIFS_UPCALL
954 unregister_key_type(&cifs_spnego_key_type);
955 out_unregister_filesystem:
957 unregister_filesystem(&cifs_fs_type);
958 out_destroy_request_bufs:
959 cifs_destroy_request_bufs();
962 out_destroy_inodecache:
963 cifs_destroy_inodecache();
966 cifs_fscache_unregister();
974 cFYI(DBG2, "exit_cifs");
976 cifs_fscache_unregister();
977 #ifdef CONFIG_CIFS_DFS_UPCALL
978 cifs_dfs_release_automount_timer();
979 cifs_exit_dns_resolver();
981 #ifdef CONFIG_CIFS_UPCALL
982 unregister_key_type(&cifs_spnego_key_type);
984 unregister_filesystem(&cifs_fs_type);
985 cifs_destroy_inodecache();
987 cifs_destroy_request_bufs();
990 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
991 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
993 ("VFS to access servers complying with the SNIA CIFS Specification "
994 "e.g. Samba and Windows");
995 MODULE_VERSION(CIFS_VERSION);
996 module_init(init_cifs)
997 module_exit(exit_cifs)