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>
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 "cifs_spnego.h"
50 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
55 unsigned int oplockEnabled = 1;
56 unsigned int linuxExtEnabled = 1;
57 unsigned int lookupCacheEnabled = 1;
58 unsigned int multiuser_mount = 0;
59 unsigned int global_secflags = CIFSSEC_DEF;
60 /* unsigned int ntlmv2_support = 0; */
61 unsigned int sign_CIFS_PDUs = 1;
62 static const struct super_operations cifs_super_ops;
63 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
64 module_param(CIFSMaxBufSize, int, 0);
65 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
66 "Default: 16384 Range: 8192 to 130048");
67 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
68 module_param(cifs_min_rcv, int, 0);
69 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
71 unsigned int cifs_min_small = 30;
72 module_param(cifs_min_small, int, 0);
73 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
75 unsigned int cifs_max_pending = CIFS_MAX_REQ;
76 module_param(cifs_max_pending, int, 0);
77 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
78 "Default: 50 Range: 2 to 256");
79 unsigned short echo_retries = 5;
80 module_param(echo_retries, ushort, 0644);
81 MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
82 "reconnecting server. Default: 5. 0 means "
84 extern mempool_t *cifs_sm_req_poolp;
85 extern mempool_t *cifs_req_poolp;
86 extern mempool_t *cifs_mid_poolp;
89 cifs_sb_active(struct super_block *sb)
91 struct cifs_sb_info *server = CIFS_SB(sb);
93 if (atomic_inc_return(&server->active) == 1)
94 atomic_inc(&sb->s_active);
98 cifs_sb_deactive(struct super_block *sb)
100 struct cifs_sb_info *server = CIFS_SB(sb);
102 if (atomic_dec_and_test(&server->active))
103 deactivate_super(sb);
107 cifs_read_super(struct super_block *sb, struct smb_vol *volume_info,
108 const char *devname, int silent)
111 struct cifs_sb_info *cifs_sb;
114 cifs_sb = CIFS_SB(sb);
116 spin_lock_init(&cifs_sb->tlink_tree_lock);
117 cifs_sb->tlink_tree = RB_ROOT;
119 rc = cifs_mount(sb, cifs_sb, volume_info, devname);
123 cERROR(1, "cifs_mount failed w/return code = %d", rc);
127 sb->s_magic = CIFS_MAGIC_NUMBER;
128 sb->s_op = &cifs_super_ops;
129 sb->s_bdi = &cifs_sb->bdi;
130 sb->s_blocksize = CIFS_MAX_MSGSIZE;
131 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
132 inode = cifs_root_iget(sb);
140 sb->s_root = d_alloc_root(inode);
147 /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
148 if (cifs_sb_master_tcon(cifs_sb)->nocase)
149 sb->s_d_op = &cifs_ci_dentry_ops;
151 sb->s_d_op = &cifs_dentry_ops;
153 #ifdef CIFS_NFSD_EXPORT
154 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
155 cFYI(1, "export ops supported");
156 sb->s_export_op = &cifs_export_ops;
158 #endif /* CIFS_NFSD_EXPORT */
163 cERROR(1, "cifs_read_super: get root inode failed");
167 cifs_umount(sb, cifs_sb);
172 cifs_put_super(struct super_block *sb)
175 struct cifs_sb_info *cifs_sb;
177 cFYI(1, "In cifs_put_super");
178 cifs_sb = CIFS_SB(sb);
179 if (cifs_sb == NULL) {
180 cFYI(1, "Empty cifs superblock info passed to unmount");
184 rc = cifs_umount(sb, cifs_sb);
186 cERROR(1, "cifs_umount failed with return code %d", rc);
187 if (cifs_sb->mountdata) {
188 kfree(cifs_sb->mountdata);
189 cifs_sb->mountdata = NULL;
192 unload_nls(cifs_sb->local_nls);
197 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
199 struct super_block *sb = dentry->d_sb;
200 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
201 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
202 int rc = -EOPNOTSUPP;
207 buf->f_type = CIFS_MAGIC_NUMBER;
210 * PATH_MAX may be too long - it would presumably be total path,
211 * but note that some servers (includinng Samba 3) have a shorter
214 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
216 buf->f_namelen = PATH_MAX;
217 buf->f_files = 0; /* undefined */
218 buf->f_ffree = 0; /* unlimited */
221 * We could add a second check for a QFS Unix capability bit
223 if ((tcon->ses->capabilities & CAP_UNIX) &&
224 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
225 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
228 * Only need to call the old QFSInfo if failed on newer one,
231 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
232 rc = CIFSSMBQFSInfo(xid, tcon, buf);
235 * Some old Windows servers also do not support level 103, retry with
236 * older level one if old server failed the previous call or we
237 * bypassed it because we detected that this was an older LANMAN sess
240 rc = SMBOldQFSInfo(xid, tcon, buf);
246 static int cifs_permission(struct inode *inode, int mask, unsigned int flags)
248 struct cifs_sb_info *cifs_sb;
250 cifs_sb = CIFS_SB(inode->i_sb);
252 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
253 if ((mask & MAY_EXEC) && !execute_ok(inode))
257 } else /* file mode might have been restricted at mount time
258 on the client (above and beyond ACL on servers) for
259 servers which do not support setting and viewing mode bits,
260 so allowing client to check permissions is useful */
261 return generic_permission(inode, mask, flags, NULL);
264 static struct kmem_cache *cifs_inode_cachep;
265 static struct kmem_cache *cifs_req_cachep;
266 static struct kmem_cache *cifs_mid_cachep;
267 static struct kmem_cache *cifs_sm_req_cachep;
268 mempool_t *cifs_sm_req_poolp;
269 mempool_t *cifs_req_poolp;
270 mempool_t *cifs_mid_poolp;
272 static struct inode *
273 cifs_alloc_inode(struct super_block *sb)
275 struct cifsInodeInfo *cifs_inode;
276 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
279 cifs_inode->cifsAttrs = 0x20; /* default */
280 cifs_inode->time = 0;
281 /* Until the file is open and we have gotten oplock
282 info back from the server, can not assume caching of
283 file data or metadata */
284 cifs_set_oplock_level(cifs_inode, 0);
285 cifs_inode->delete_pending = false;
286 cifs_inode->invalid_mapping = false;
287 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
288 cifs_inode->server_eof = 0;
289 cifs_inode->uniqueid = 0;
290 cifs_inode->createtime = 0;
292 /* Can not set i_flags here - they get immediately overwritten
293 to zero by the VFS */
294 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
295 INIT_LIST_HEAD(&cifs_inode->openFileList);
296 return &cifs_inode->vfs_inode;
299 static void cifs_i_callback(struct rcu_head *head)
301 struct inode *inode = container_of(head, struct inode, i_rcu);
302 INIT_LIST_HEAD(&inode->i_dentry);
303 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
307 cifs_destroy_inode(struct inode *inode)
309 call_rcu(&inode->i_rcu, cifs_i_callback);
313 cifs_evict_inode(struct inode *inode)
315 truncate_inode_pages(&inode->i_data, 0);
316 end_writeback(inode);
317 cifs_fscache_release_inode_cookie(inode);
321 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
323 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
324 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
326 seq_printf(s, ",addr=");
328 switch (server->dstaddr.ss_family) {
330 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
333 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
334 if (sa6->sin6_scope_id)
335 seq_printf(s, "%%%u", sa6->sin6_scope_id);
338 seq_printf(s, "(unknown)");
343 cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server)
345 seq_printf(s, ",sec=");
347 switch (server->secType) {
349 seq_printf(s, "lanman");
352 seq_printf(s, "ntlmv2");
355 seq_printf(s, "ntlm");
358 seq_printf(s, "krb5");
361 seq_printf(s, "ntlmssp");
364 /* shouldn't ever happen */
365 seq_printf(s, "unknown");
369 if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
374 * cifs_show_options() is for displaying mount options in /proc/mounts.
375 * Not all settable options are displayed but most of the important
379 cifs_show_options(struct seq_file *s, struct vfsmount *m)
381 struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
382 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
383 struct sockaddr *srcaddr;
384 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
386 cifs_show_security(s, tcon->ses->server);
388 seq_printf(s, ",unc=%s", tcon->treeName);
390 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
391 seq_printf(s, ",multiuser");
392 else if (tcon->ses->user_name)
393 seq_printf(s, ",username=%s", tcon->ses->user_name);
395 if (tcon->ses->domainName)
396 seq_printf(s, ",domain=%s", tcon->ses->domainName);
398 if (srcaddr->sa_family != AF_UNSPEC) {
399 struct sockaddr_in *saddr4;
400 struct sockaddr_in6 *saddr6;
401 saddr4 = (struct sockaddr_in *)srcaddr;
402 saddr6 = (struct sockaddr_in6 *)srcaddr;
403 if (srcaddr->sa_family == AF_INET6)
404 seq_printf(s, ",srcaddr=%pI6c",
406 else if (srcaddr->sa_family == AF_INET)
407 seq_printf(s, ",srcaddr=%pI4",
408 &saddr4->sin_addr.s_addr);
410 seq_printf(s, ",srcaddr=BAD-AF:%i",
411 (int)(srcaddr->sa_family));
414 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
415 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
416 seq_printf(s, ",forceuid");
418 seq_printf(s, ",noforceuid");
420 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
421 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
422 seq_printf(s, ",forcegid");
424 seq_printf(s, ",noforcegid");
426 cifs_show_address(s, tcon->ses->server);
429 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
430 cifs_sb->mnt_file_mode,
431 cifs_sb->mnt_dir_mode);
433 seq_printf(s, ",seal");
435 seq_printf(s, ",nocase");
437 seq_printf(s, ",hard");
439 seq_printf(s, ",unix");
441 seq_printf(s, ",nounix");
442 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
443 seq_printf(s, ",posixpaths");
444 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
445 seq_printf(s, ",setuids");
446 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
447 seq_printf(s, ",serverino");
448 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
449 seq_printf(s, ",rwpidforward");
450 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
451 seq_printf(s, ",forcemand");
452 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
453 seq_printf(s, ",directio");
454 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
455 seq_printf(s, ",nouser_xattr");
456 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
457 seq_printf(s, ",mapchars");
458 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
459 seq_printf(s, ",sfu");
460 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
461 seq_printf(s, ",nobrl");
462 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
463 seq_printf(s, ",cifsacl");
464 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
465 seq_printf(s, ",dynperm");
466 if (m->mnt_sb->s_flags & MS_POSIXACL)
467 seq_printf(s, ",acl");
468 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
469 seq_printf(s, ",mfsymlinks");
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
471 seq_printf(s, ",fsc");
473 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
474 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
475 /* convert actimeo and display it in seconds */
476 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
481 static void cifs_umount_begin(struct super_block *sb)
483 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
484 struct cifs_tcon *tcon;
489 tcon = cifs_sb_master_tcon(cifs_sb);
491 spin_lock(&cifs_tcp_ses_lock);
492 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
493 /* we have other mounts to same share or we have
494 already tried to force umount this and woken up
495 all waiting network requests, nothing to do */
496 spin_unlock(&cifs_tcp_ses_lock);
498 } else if (tcon->tc_count == 1)
499 tcon->tidStatus = CifsExiting;
500 spin_unlock(&cifs_tcp_ses_lock);
502 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
503 /* cancel_notify_requests(tcon); */
504 if (tcon->ses && tcon->ses->server) {
505 cFYI(1, "wake up tasks now - umount begin not complete");
506 wake_up_all(&tcon->ses->server->request_q);
507 wake_up_all(&tcon->ses->server->response_q);
508 msleep(1); /* yield */
509 /* we have to kick the requests once more */
510 wake_up_all(&tcon->ses->server->response_q);
517 #ifdef CONFIG_CIFS_STATS2
518 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
525 static int cifs_remount(struct super_block *sb, int *flags, char *data)
527 *flags |= MS_NODIRATIME;
531 static int cifs_drop_inode(struct inode *inode)
533 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
535 /* no serverino => unconditional eviction */
536 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
537 generic_drop_inode(inode);
540 static const struct super_operations cifs_super_ops = {
541 .put_super = cifs_put_super,
542 .statfs = cifs_statfs,
543 .alloc_inode = cifs_alloc_inode,
544 .destroy_inode = cifs_destroy_inode,
545 .drop_inode = cifs_drop_inode,
546 .evict_inode = cifs_evict_inode,
547 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
548 function unless later we add lazy close of inodes or unless the
549 kernel forgets to call us with the same number of releases (closes)
551 .show_options = cifs_show_options,
552 .umount_begin = cifs_umount_begin,
553 .remount_fs = cifs_remount,
554 #ifdef CONFIG_CIFS_STATS2
555 .show_stats = cifs_show_stats,
560 * Get root dentry from superblock according to prefix path mount option.
561 * Return dentry with refcount + 1 on success and NULL otherwise.
563 static struct dentry *
564 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
569 struct dentry *dparent = NULL, *dchild = NULL, *alias;
570 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
571 unsigned int i, full_len, len;
572 char *full_path = NULL, *pstart;
575 full_path = cifs_build_path_to_root(vol, cifs_sb,
576 cifs_sb_master_tcon(cifs_sb));
577 if (full_path == NULL)
580 cFYI(1, "Get root dentry for %s", full_path);
583 sep = CIFS_DIR_SEP(cifs_sb);
584 dparent = dget(sb->s_root);
585 full_len = strlen(full_path);
586 full_path[full_len] = sep;
587 pstart = full_path + 1;
589 for (i = 1, len = 0; i <= full_len; i++) {
590 if (full_path[i] != sep || !len) {
596 cFYI(1, "get dentry for %s", pstart);
600 name.hash = full_name_hash(pstart, len);
601 dchild = d_lookup(dparent, &name);
602 if (dchild == NULL) {
603 cFYI(1, "not exists");
604 dchild = d_alloc(dparent, &name);
605 if (dchild == NULL) {
612 cFYI(1, "get inode");
613 if (dchild->d_inode == NULL) {
614 cFYI(1, "not exists");
616 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
617 rc = cifs_get_inode_info_unix(&inode, full_path,
620 rc = cifs_get_inode_info(&inode, full_path,
621 NULL, sb, xid, NULL);
628 alias = d_materialise_unique(dchild, inode);
639 cFYI(1, "parent %p, child %p", dparent, dchild);
644 pstart = full_path + i + 1;
653 static struct dentry *
654 cifs_do_mount(struct file_system_type *fs_type,
655 int flags, const char *dev_name, void *data)
658 struct super_block *sb;
659 struct cifs_sb_info *cifs_sb;
660 struct smb_vol *volume_info;
661 struct cifs_mnt_data mnt_data;
664 cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
666 rc = cifs_setup_volume_info(&volume_info, (char *)data, dev_name);
670 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
671 if (cifs_sb == NULL) {
672 root = ERR_PTR(-ENOMEM);
676 cifs_setup_cifs_sb(volume_info, cifs_sb);
678 mnt_data.vol = volume_info;
679 mnt_data.cifs_sb = cifs_sb;
680 mnt_data.flags = flags;
682 sb = sget(fs_type, cifs_match_super, set_anon_super, &mnt_data);
689 cFYI(1, "Use existing superblock");
694 * Copy mount params for use in submounts. Better to do
695 * the copy here and deal with the error before cleanup gets
696 * complicated post-mount.
698 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
699 if (cifs_sb->mountdata == NULL) {
700 root = ERR_PTR(-ENOMEM);
705 /* BB should we make this contingent on mount parm? */
706 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
707 sb->s_fs_info = cifs_sb;
709 rc = cifs_read_super(sb, volume_info, dev_name,
710 flags & MS_SILENT ? 1 : 0);
716 sb->s_flags |= MS_ACTIVE;
718 root = cifs_get_root(volume_info, sb);
722 cFYI(1, "dentry root is: %p", root);
726 root = cifs_get_root(volume_info, sb);
728 cFYI(1, "dentry root is: %p", root);
732 kfree(cifs_sb->mountdata);
733 deactivate_locked_super(sb);
736 unload_nls(cifs_sb->local_nls);
740 cifs_cleanup_volume_info(&volume_info);
744 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
745 unsigned long nr_segs, loff_t pos)
747 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
751 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
753 if (CIFS_I(inode)->clientCanCacheAll)
756 rc = filemap_fdatawrite(inode->i_mapping);
758 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
763 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
765 /* origin == SEEK_END => we must revalidate the cached file length */
766 if (origin == SEEK_END) {
768 struct inode *inode = file->f_path.dentry->d_inode;
771 * We need to be sure that all dirty pages are written and the
772 * server has the newest file length.
774 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
775 inode->i_mapping->nrpages != 0) {
776 rc = filemap_fdatawait(inode->i_mapping);
778 mapping_set_error(inode->i_mapping, rc);
783 * Some applications poll for the file length in this strange
784 * way so we must seek to end on non-oplocked files by
785 * setting the revalidate time to zero.
787 CIFS_I(inode)->time = 0;
789 rc = cifs_revalidate_file_attr(file);
793 return generic_file_llseek_unlocked(file, offset, origin);
796 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
798 /* note that this is called by vfs setlease with lock_flocks held
799 to protect *lease from going away */
800 struct inode *inode = file->f_path.dentry->d_inode;
801 struct cifsFileInfo *cfile = file->private_data;
803 if (!(S_ISREG(inode->i_mode)))
806 /* check if file is oplocked */
807 if (((arg == F_RDLCK) &&
808 (CIFS_I(inode)->clientCanCacheRead)) ||
810 (CIFS_I(inode)->clientCanCacheAll)))
811 return generic_setlease(file, arg, lease);
812 else if (tlink_tcon(cfile->tlink)->local_lease &&
813 !CIFS_I(inode)->clientCanCacheRead)
814 /* If the server claims to support oplock on this
815 file, then we still need to check oplock even
816 if the local_lease mount option is set, but there
817 are servers which do not support oplock for which
818 this mount option may be useful if the user
819 knows that the file won't be changed on the server
821 return generic_setlease(file, arg, lease);
826 struct file_system_type cifs_fs_type = {
827 .owner = THIS_MODULE,
829 .mount = cifs_do_mount,
830 .kill_sb = kill_anon_super,
833 const struct inode_operations cifs_dir_inode_ops = {
834 .create = cifs_create,
835 .lookup = cifs_lookup,
836 .getattr = cifs_getattr,
837 .unlink = cifs_unlink,
838 .link = cifs_hardlink,
841 .rename = cifs_rename,
842 .permission = cifs_permission,
843 /* revalidate:cifs_revalidate, */
844 .setattr = cifs_setattr,
845 .symlink = cifs_symlink,
847 #ifdef CONFIG_CIFS_XATTR
848 .setxattr = cifs_setxattr,
849 .getxattr = cifs_getxattr,
850 .listxattr = cifs_listxattr,
851 .removexattr = cifs_removexattr,
855 const struct inode_operations cifs_file_inode_ops = {
856 /* revalidate:cifs_revalidate, */
857 .setattr = cifs_setattr,
858 .getattr = cifs_getattr, /* do we need this anymore? */
859 .rename = cifs_rename,
860 .permission = cifs_permission,
861 #ifdef CONFIG_CIFS_XATTR
862 .setxattr = cifs_setxattr,
863 .getxattr = cifs_getxattr,
864 .listxattr = cifs_listxattr,
865 .removexattr = cifs_removexattr,
869 const struct inode_operations cifs_symlink_inode_ops = {
870 .readlink = generic_readlink,
871 .follow_link = cifs_follow_link,
872 .put_link = cifs_put_link,
873 .permission = cifs_permission,
874 /* BB add the following two eventually */
875 /* revalidate: cifs_revalidate,
876 setattr: cifs_notify_change, *//* BB do we need notify change */
877 #ifdef CONFIG_CIFS_XATTR
878 .setxattr = cifs_setxattr,
879 .getxattr = cifs_getxattr,
880 .listxattr = cifs_listxattr,
881 .removexattr = cifs_removexattr,
885 const struct file_operations cifs_file_ops = {
886 .read = do_sync_read,
887 .write = do_sync_write,
888 .aio_read = generic_file_aio_read,
889 .aio_write = cifs_file_aio_write,
891 .release = cifs_close,
895 .mmap = cifs_file_mmap,
896 .splice_read = generic_file_splice_read,
897 .llseek = cifs_llseek,
898 #ifdef CONFIG_CIFS_POSIX
899 .unlocked_ioctl = cifs_ioctl,
900 #endif /* CONFIG_CIFS_POSIX */
901 .setlease = cifs_setlease,
904 const struct file_operations cifs_file_strict_ops = {
905 .read = do_sync_read,
906 .write = do_sync_write,
907 .aio_read = cifs_strict_readv,
908 .aio_write = cifs_strict_writev,
910 .release = cifs_close,
912 .fsync = cifs_strict_fsync,
914 .mmap = cifs_file_strict_mmap,
915 .splice_read = generic_file_splice_read,
916 .llseek = cifs_llseek,
917 #ifdef CONFIG_CIFS_POSIX
918 .unlocked_ioctl = cifs_ioctl,
919 #endif /* CONFIG_CIFS_POSIX */
920 .setlease = cifs_setlease,
923 const struct file_operations cifs_file_direct_ops = {
924 /* BB reevaluate whether they can be done with directio, no cache */
925 .read = do_sync_read,
926 .write = do_sync_write,
927 .aio_read = cifs_user_readv,
928 .aio_write = cifs_user_writev,
930 .release = cifs_close,
934 .mmap = cifs_file_mmap,
935 .splice_read = generic_file_splice_read,
936 #ifdef CONFIG_CIFS_POSIX
937 .unlocked_ioctl = cifs_ioctl,
938 #endif /* CONFIG_CIFS_POSIX */
939 .llseek = cifs_llseek,
940 .setlease = cifs_setlease,
943 const struct file_operations cifs_file_nobrl_ops = {
944 .read = do_sync_read,
945 .write = do_sync_write,
946 .aio_read = generic_file_aio_read,
947 .aio_write = cifs_file_aio_write,
949 .release = cifs_close,
952 .mmap = cifs_file_mmap,
953 .splice_read = generic_file_splice_read,
954 .llseek = cifs_llseek,
955 #ifdef CONFIG_CIFS_POSIX
956 .unlocked_ioctl = cifs_ioctl,
957 #endif /* CONFIG_CIFS_POSIX */
958 .setlease = cifs_setlease,
961 const struct file_operations cifs_file_strict_nobrl_ops = {
962 .read = do_sync_read,
963 .write = do_sync_write,
964 .aio_read = cifs_strict_readv,
965 .aio_write = cifs_strict_writev,
967 .release = cifs_close,
968 .fsync = cifs_strict_fsync,
970 .mmap = cifs_file_strict_mmap,
971 .splice_read = generic_file_splice_read,
972 .llseek = cifs_llseek,
973 #ifdef CONFIG_CIFS_POSIX
974 .unlocked_ioctl = cifs_ioctl,
975 #endif /* CONFIG_CIFS_POSIX */
976 .setlease = cifs_setlease,
979 const struct file_operations cifs_file_direct_nobrl_ops = {
980 /* BB reevaluate whether they can be done with directio, no cache */
981 .read = do_sync_read,
982 .write = do_sync_write,
983 .aio_read = cifs_user_readv,
984 .aio_write = cifs_user_writev,
986 .release = cifs_close,
989 .mmap = cifs_file_mmap,
990 .splice_read = generic_file_splice_read,
991 #ifdef CONFIG_CIFS_POSIX
992 .unlocked_ioctl = cifs_ioctl,
993 #endif /* CONFIG_CIFS_POSIX */
994 .llseek = cifs_llseek,
995 .setlease = cifs_setlease,
998 const struct file_operations cifs_dir_ops = {
999 .readdir = cifs_readdir,
1000 .release = cifs_closedir,
1001 .read = generic_read_dir,
1002 .unlocked_ioctl = cifs_ioctl,
1003 .llseek = generic_file_llseek,
1007 cifs_init_once(void *inode)
1009 struct cifsInodeInfo *cifsi = inode;
1011 inode_init_once(&cifsi->vfs_inode);
1012 INIT_LIST_HEAD(&cifsi->lockList);
1016 cifs_init_inodecache(void)
1018 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1019 sizeof(struct cifsInodeInfo),
1020 0, (SLAB_RECLAIM_ACCOUNT|
1023 if (cifs_inode_cachep == NULL)
1030 cifs_destroy_inodecache(void)
1032 kmem_cache_destroy(cifs_inode_cachep);
1036 cifs_init_request_bufs(void)
1038 if (CIFSMaxBufSize < 8192) {
1039 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1040 Unicode path name has to fit in any SMB/CIFS path based frames */
1041 CIFSMaxBufSize = 8192;
1042 } else if (CIFSMaxBufSize > 1024*127) {
1043 CIFSMaxBufSize = 1024 * 127;
1045 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1047 /* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
1048 cifs_req_cachep = kmem_cache_create("cifs_request",
1050 MAX_CIFS_HDR_SIZE, 0,
1051 SLAB_HWCACHE_ALIGN, NULL);
1052 if (cifs_req_cachep == NULL)
1055 if (cifs_min_rcv < 1)
1057 else if (cifs_min_rcv > 64) {
1059 cERROR(1, "cifs_min_rcv set to maximum (64)");
1062 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1065 if (cifs_req_poolp == NULL) {
1066 kmem_cache_destroy(cifs_req_cachep);
1069 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1070 almost all handle based requests (but not write response, nor is it
1071 sufficient for path based requests). A smaller size would have
1072 been more efficient (compacting multiple slab items on one 4k page)
1073 for the case in which debug was on, but this larger size allows
1074 more SMBs to use small buffer alloc and is still much more
1075 efficient to alloc 1 per page off the slab compared to 17K (5page)
1076 alloc of large cifs buffers even when page debugging is on */
1077 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1078 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1080 if (cifs_sm_req_cachep == NULL) {
1081 mempool_destroy(cifs_req_poolp);
1082 kmem_cache_destroy(cifs_req_cachep);
1086 if (cifs_min_small < 2)
1088 else if (cifs_min_small > 256) {
1089 cifs_min_small = 256;
1090 cFYI(1, "cifs_min_small set to maximum (256)");
1093 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1094 cifs_sm_req_cachep);
1096 if (cifs_sm_req_poolp == NULL) {
1097 mempool_destroy(cifs_req_poolp);
1098 kmem_cache_destroy(cifs_req_cachep);
1099 kmem_cache_destroy(cifs_sm_req_cachep);
1107 cifs_destroy_request_bufs(void)
1109 mempool_destroy(cifs_req_poolp);
1110 kmem_cache_destroy(cifs_req_cachep);
1111 mempool_destroy(cifs_sm_req_poolp);
1112 kmem_cache_destroy(cifs_sm_req_cachep);
1116 cifs_init_mids(void)
1118 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1119 sizeof(struct mid_q_entry), 0,
1120 SLAB_HWCACHE_ALIGN, NULL);
1121 if (cifs_mid_cachep == NULL)
1124 /* 3 is a reasonable minimum number of simultaneous operations */
1125 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1126 if (cifs_mid_poolp == NULL) {
1127 kmem_cache_destroy(cifs_mid_cachep);
1135 cifs_destroy_mids(void)
1137 mempool_destroy(cifs_mid_poolp);
1138 kmem_cache_destroy(cifs_mid_cachep);
1146 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1147 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1148 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1149 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1150 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1152 * Initialize Global counters
1154 atomic_set(&sesInfoAllocCount, 0);
1155 atomic_set(&tconInfoAllocCount, 0);
1156 atomic_set(&tcpSesAllocCount, 0);
1157 atomic_set(&tcpSesReconnectCount, 0);
1158 atomic_set(&tconInfoReconnectCount, 0);
1160 atomic_set(&bufAllocCount, 0);
1161 atomic_set(&smBufAllocCount, 0);
1162 #ifdef CONFIG_CIFS_STATS2
1163 atomic_set(&totBufAllocCount, 0);
1164 atomic_set(&totSmBufAllocCount, 0);
1165 #endif /* CONFIG_CIFS_STATS2 */
1167 atomic_set(&midCount, 0);
1168 GlobalCurrentXid = 0;
1169 GlobalTotalActiveXid = 0;
1170 GlobalMaxActiveXid = 0;
1171 spin_lock_init(&cifs_tcp_ses_lock);
1172 spin_lock_init(&cifs_file_list_lock);
1173 spin_lock_init(&GlobalMid_Lock);
1175 if (cifs_max_pending < 2) {
1176 cifs_max_pending = 2;
1177 cFYI(1, "cifs_max_pending set to min of 2");
1178 } else if (cifs_max_pending > 256) {
1179 cifs_max_pending = 256;
1180 cFYI(1, "cifs_max_pending set to max of 256");
1183 rc = cifs_fscache_register();
1185 goto out_clean_proc;
1187 rc = cifs_init_inodecache();
1189 goto out_unreg_fscache;
1191 rc = cifs_init_mids();
1193 goto out_destroy_inodecache;
1195 rc = cifs_init_request_bufs();
1197 goto out_destroy_mids;
1199 #ifdef CONFIG_CIFS_UPCALL
1200 rc = register_key_type(&cifs_spnego_key_type);
1202 goto out_destroy_request_bufs;
1203 #endif /* CONFIG_CIFS_UPCALL */
1205 #ifdef CONFIG_CIFS_ACL
1206 rc = init_cifs_idmap();
1208 goto out_register_key_type;
1209 #endif /* CONFIG_CIFS_ACL */
1211 rc = register_filesystem(&cifs_fs_type);
1213 goto out_init_cifs_idmap;
1217 out_init_cifs_idmap:
1218 #ifdef CONFIG_CIFS_ACL
1220 out_register_key_type:
1222 #ifdef CONFIG_CIFS_UPCALL
1223 unregister_key_type(&cifs_spnego_key_type);
1224 out_destroy_request_bufs:
1226 cifs_destroy_request_bufs();
1228 cifs_destroy_mids();
1229 out_destroy_inodecache:
1230 cifs_destroy_inodecache();
1232 cifs_fscache_unregister();
1241 cFYI(DBG2, "exit_cifs");
1243 cifs_fscache_unregister();
1244 #ifdef CONFIG_CIFS_DFS_UPCALL
1245 cifs_dfs_release_automount_timer();
1247 #ifdef CONFIG_CIFS_ACL
1248 cifs_destroy_idmaptrees();
1251 #ifdef CONFIG_CIFS_UPCALL
1252 unregister_key_type(&cifs_spnego_key_type);
1254 unregister_filesystem(&cifs_fs_type);
1255 cifs_destroy_inodecache();
1256 cifs_destroy_mids();
1257 cifs_destroy_request_bufs();
1260 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1261 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1263 ("VFS to access servers complying with the SNIA CIFS Specification "
1264 "e.g. Samba and Windows");
1265 MODULE_VERSION(CIFS_VERSION);
1266 module_init(init_cifs)
1267 module_exit(exit_cifs)