Merge branch 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[cris-mirror.git] / fs / cifs / cifsfs.c
bloba8323f1dc1c48cf29b33a8c0323005adb270b296
1 /*
2 * fs/cifs/cifsfs.c
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>
27 #include <linux/fs.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 <net/ipv6.h>
39 #include "cifsfs.h"
40 #include "cifspdu.h"
41 #define DECLARE_GLOBALS_HERE
42 #include "cifsglob.h"
43 #include "cifsproto.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
46 #include <linux/mm.h>
47 #include <linux/key-type.h>
48 #include "cifs_spnego.h"
49 #include "fscache.h"
50 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
52 int cifsFYI = 0;
53 int cifsERROR = 1;
54 int traceSMB = 0;
55 unsigned int oplockEnabled = 1;
56 unsigned int experimEnabled = 0;
57 unsigned int linuxExtEnabled = 1;
58 unsigned int lookupCacheEnabled = 1;
59 unsigned int multiuser_mount = 0;
60 unsigned int global_secflags = CIFSSEC_DEF;
61 /* unsigned int ntlmv2_support = 0; */
62 unsigned int sign_CIFS_PDUs = 1;
63 static const struct super_operations cifs_super_ops;
64 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
65 module_param(CIFSMaxBufSize, int, 0);
66 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
67 "Default: 16384 Range: 8192 to 130048");
68 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
69 module_param(cifs_min_rcv, int, 0);
70 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
71 "1 to 64");
72 unsigned int cifs_min_small = 30;
73 module_param(cifs_min_small, int, 0);
74 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
75 "Range: 2 to 256");
76 unsigned int cifs_max_pending = CIFS_MAX_REQ;
77 module_param(cifs_max_pending, int, 0);
78 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
79 "Default: 50 Range: 2 to 256");
80 unsigned short echo_retries = 5;
81 module_param(echo_retries, ushort, 0644);
82 MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
83 "reconnecting server. Default: 5. 0 means "
84 "never reconnect.");
85 extern mempool_t *cifs_sm_req_poolp;
86 extern mempool_t *cifs_req_poolp;
87 extern mempool_t *cifs_mid_poolp;
89 void
90 cifs_sb_active(struct super_block *sb)
92 struct cifs_sb_info *server = CIFS_SB(sb);
94 if (atomic_inc_return(&server->active) == 1)
95 atomic_inc(&sb->s_active);
98 void
99 cifs_sb_deactive(struct super_block *sb)
101 struct cifs_sb_info *server = CIFS_SB(sb);
103 if (atomic_dec_and_test(&server->active))
104 deactivate_super(sb);
107 static int
108 cifs_read_super(struct super_block *sb, void *data,
109 const char *devname, int silent)
111 struct inode *inode;
112 struct cifs_sb_info *cifs_sb;
113 int rc = 0;
115 /* BB should we make this contingent on mount parm? */
116 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
117 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
118 cifs_sb = CIFS_SB(sb);
119 if (cifs_sb == NULL)
120 return -ENOMEM;
122 spin_lock_init(&cifs_sb->tlink_tree_lock);
123 cifs_sb->tlink_tree = RB_ROOT;
125 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
126 if (rc) {
127 kfree(cifs_sb);
128 return rc;
131 #ifdef CONFIG_CIFS_DFS_UPCALL
132 /* copy mount params to sb for use in submounts */
133 /* BB: should we move this after the mount so we
134 * do not have to do the copy on failed mounts?
135 * BB: May be it is better to do simple copy before
136 * complex operation (mount), and in case of fail
137 * just exit instead of doing mount and attempting
138 * undo it if this copy fails?*/
139 if (data) {
140 int len = strlen(data);
141 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
142 if (cifs_sb->mountdata == NULL) {
143 bdi_destroy(&cifs_sb->bdi);
144 kfree(sb->s_fs_info);
145 sb->s_fs_info = NULL;
146 return -ENOMEM;
148 strncpy(cifs_sb->mountdata, data, len + 1);
149 cifs_sb->mountdata[len] = '\0';
151 #endif
153 rc = cifs_mount(sb, cifs_sb, data, devname);
155 if (rc) {
156 if (!silent)
157 cERROR(1, "cifs_mount failed w/return code = %d", rc);
158 goto out_mount_failed;
161 sb->s_magic = CIFS_MAGIC_NUMBER;
162 sb->s_op = &cifs_super_ops;
163 sb->s_bdi = &cifs_sb->bdi;
164 sb->s_blocksize = CIFS_MAX_MSGSIZE;
165 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
166 inode = cifs_root_iget(sb, ROOT_I);
168 if (IS_ERR(inode)) {
169 rc = PTR_ERR(inode);
170 inode = NULL;
171 goto out_no_root;
174 sb->s_root = d_alloc_root(inode);
176 if (!sb->s_root) {
177 rc = -ENOMEM;
178 goto out_no_root;
181 /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
182 if (cifs_sb_master_tcon(cifs_sb)->nocase)
183 sb->s_d_op = &cifs_ci_dentry_ops;
184 else
185 sb->s_d_op = &cifs_dentry_ops;
187 #ifdef CONFIG_CIFS_EXPERIMENTAL
188 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
189 cFYI(1, "export ops supported");
190 sb->s_export_op = &cifs_export_ops;
192 #endif /* EXPERIMENTAL */
194 return 0;
196 out_no_root:
197 cERROR(1, "cifs_read_super: get root inode failed");
198 if (inode)
199 iput(inode);
201 cifs_umount(sb, cifs_sb);
203 out_mount_failed:
204 if (cifs_sb) {
205 #ifdef CONFIG_CIFS_DFS_UPCALL
206 if (cifs_sb->mountdata) {
207 kfree(cifs_sb->mountdata);
208 cifs_sb->mountdata = NULL;
210 #endif
211 unload_nls(cifs_sb->local_nls);
212 bdi_destroy(&cifs_sb->bdi);
213 kfree(cifs_sb);
215 return rc;
218 static void
219 cifs_put_super(struct super_block *sb)
221 int rc = 0;
222 struct cifs_sb_info *cifs_sb;
224 cFYI(1, "In cifs_put_super");
225 cifs_sb = CIFS_SB(sb);
226 if (cifs_sb == NULL) {
227 cFYI(1, "Empty cifs superblock info passed to unmount");
228 return;
231 rc = cifs_umount(sb, cifs_sb);
232 if (rc)
233 cERROR(1, "cifs_umount failed with return code %d", rc);
234 #ifdef CONFIG_CIFS_DFS_UPCALL
235 if (cifs_sb->mountdata) {
236 kfree(cifs_sb->mountdata);
237 cifs_sb->mountdata = NULL;
239 #endif
241 unload_nls(cifs_sb->local_nls);
242 bdi_destroy(&cifs_sb->bdi);
243 kfree(cifs_sb);
246 static int
247 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
249 struct super_block *sb = dentry->d_sb;
250 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
251 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
252 int rc = -EOPNOTSUPP;
253 int xid;
255 xid = GetXid();
257 buf->f_type = CIFS_MAGIC_NUMBER;
260 * PATH_MAX may be too long - it would presumably be total path,
261 * but note that some servers (includinng Samba 3) have a shorter
262 * maximum path.
264 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
266 buf->f_namelen = PATH_MAX;
267 buf->f_files = 0; /* undefined */
268 buf->f_ffree = 0; /* unlimited */
271 * We could add a second check for a QFS Unix capability bit
273 if ((tcon->ses->capabilities & CAP_UNIX) &&
274 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
275 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
278 * Only need to call the old QFSInfo if failed on newer one,
279 * e.g. by OS/2.
281 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
282 rc = CIFSSMBQFSInfo(xid, tcon, buf);
285 * Some old Windows servers also do not support level 103, retry with
286 * older level one if old server failed the previous call or we
287 * bypassed it because we detected that this was an older LANMAN sess
289 if (rc)
290 rc = SMBOldQFSInfo(xid, tcon, buf);
292 FreeXid(xid);
293 return 0;
296 static int cifs_permission(struct inode *inode, int mask, unsigned int flags)
298 struct cifs_sb_info *cifs_sb;
300 if (flags & IPERM_FLAG_RCU)
301 return -ECHILD;
303 cifs_sb = CIFS_SB(inode->i_sb);
305 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
306 if ((mask & MAY_EXEC) && !execute_ok(inode))
307 return -EACCES;
308 else
309 return 0;
310 } else /* file mode might have been restricted at mount time
311 on the client (above and beyond ACL on servers) for
312 servers which do not support setting and viewing mode bits,
313 so allowing client to check permissions is useful */
314 return generic_permission(inode, mask, flags, NULL);
317 static struct kmem_cache *cifs_inode_cachep;
318 static struct kmem_cache *cifs_req_cachep;
319 static struct kmem_cache *cifs_mid_cachep;
320 static struct kmem_cache *cifs_sm_req_cachep;
321 mempool_t *cifs_sm_req_poolp;
322 mempool_t *cifs_req_poolp;
323 mempool_t *cifs_mid_poolp;
325 static struct inode *
326 cifs_alloc_inode(struct super_block *sb)
328 struct cifsInodeInfo *cifs_inode;
329 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
330 if (!cifs_inode)
331 return NULL;
332 cifs_inode->cifsAttrs = 0x20; /* default */
333 cifs_inode->time = 0;
334 /* Until the file is open and we have gotten oplock
335 info back from the server, can not assume caching of
336 file data or metadata */
337 cifs_set_oplock_level(cifs_inode, 0);
338 cifs_inode->delete_pending = false;
339 cifs_inode->invalid_mapping = false;
340 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
341 cifs_inode->server_eof = 0;
342 cifs_inode->uniqueid = 0;
343 cifs_inode->createtime = 0;
345 /* Can not set i_flags here - they get immediately overwritten
346 to zero by the VFS */
347 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
348 INIT_LIST_HEAD(&cifs_inode->openFileList);
349 return &cifs_inode->vfs_inode;
352 static void cifs_i_callback(struct rcu_head *head)
354 struct inode *inode = container_of(head, struct inode, i_rcu);
355 INIT_LIST_HEAD(&inode->i_dentry);
356 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
359 static void
360 cifs_destroy_inode(struct inode *inode)
362 call_rcu(&inode->i_rcu, cifs_i_callback);
365 static void
366 cifs_evict_inode(struct inode *inode)
368 truncate_inode_pages(&inode->i_data, 0);
369 end_writeback(inode);
370 cifs_fscache_release_inode_cookie(inode);
373 static void
374 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
376 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
377 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
379 seq_printf(s, ",addr=");
381 switch (server->dstaddr.ss_family) {
382 case AF_INET:
383 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
384 break;
385 case AF_INET6:
386 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
387 if (sa6->sin6_scope_id)
388 seq_printf(s, "%%%u", sa6->sin6_scope_id);
389 break;
390 default:
391 seq_printf(s, "(unknown)");
396 * cifs_show_options() is for displaying mount options in /proc/mounts.
397 * Not all settable options are displayed but most of the important
398 * ones are.
400 static int
401 cifs_show_options(struct seq_file *s, struct vfsmount *m)
403 struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
404 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
405 struct sockaddr *srcaddr;
406 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
408 seq_printf(s, ",unc=%s", tcon->treeName);
410 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
411 seq_printf(s, ",multiuser");
412 else if (tcon->ses->userName)
413 seq_printf(s, ",username=%s", tcon->ses->userName);
415 if (tcon->ses->domainName)
416 seq_printf(s, ",domain=%s", tcon->ses->domainName);
418 if (srcaddr->sa_family != AF_UNSPEC) {
419 struct sockaddr_in *saddr4;
420 struct sockaddr_in6 *saddr6;
421 saddr4 = (struct sockaddr_in *)srcaddr;
422 saddr6 = (struct sockaddr_in6 *)srcaddr;
423 if (srcaddr->sa_family == AF_INET6)
424 seq_printf(s, ",srcaddr=%pI6c",
425 &saddr6->sin6_addr);
426 else if (srcaddr->sa_family == AF_INET)
427 seq_printf(s, ",srcaddr=%pI4",
428 &saddr4->sin_addr.s_addr);
429 else
430 seq_printf(s, ",srcaddr=BAD-AF:%i",
431 (int)(srcaddr->sa_family));
434 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
435 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
436 seq_printf(s, ",forceuid");
437 else
438 seq_printf(s, ",noforceuid");
440 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
441 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
442 seq_printf(s, ",forcegid");
443 else
444 seq_printf(s, ",noforcegid");
446 cifs_show_address(s, tcon->ses->server);
448 if (!tcon->unix_ext)
449 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
450 cifs_sb->mnt_file_mode,
451 cifs_sb->mnt_dir_mode);
452 if (tcon->seal)
453 seq_printf(s, ",seal");
454 if (tcon->nocase)
455 seq_printf(s, ",nocase");
456 if (tcon->retry)
457 seq_printf(s, ",hard");
458 if (cifs_sb->prepath)
459 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
460 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
461 seq_printf(s, ",posixpaths");
462 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
463 seq_printf(s, ",setuids");
464 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
465 seq_printf(s, ",serverino");
466 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
467 seq_printf(s, ",directio");
468 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
469 seq_printf(s, ",nouser_xattr");
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
471 seq_printf(s, ",mapchars");
472 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
473 seq_printf(s, ",sfu");
474 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
475 seq_printf(s, ",nobrl");
476 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
477 seq_printf(s, ",cifsacl");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
479 seq_printf(s, ",dynperm");
480 if (m->mnt_sb->s_flags & MS_POSIXACL)
481 seq_printf(s, ",acl");
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
483 seq_printf(s, ",mfsymlinks");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
485 seq_printf(s, ",fsc");
487 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
488 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
489 /* convert actimeo and display it in seconds */
490 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
492 return 0;
495 static void cifs_umount_begin(struct super_block *sb)
497 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
498 struct cifsTconInfo *tcon;
500 if (cifs_sb == NULL)
501 return;
503 tcon = cifs_sb_master_tcon(cifs_sb);
505 spin_lock(&cifs_tcp_ses_lock);
506 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
507 /* we have other mounts to same share or we have
508 already tried to force umount this and woken up
509 all waiting network requests, nothing to do */
510 spin_unlock(&cifs_tcp_ses_lock);
511 return;
512 } else if (tcon->tc_count == 1)
513 tcon->tidStatus = CifsExiting;
514 spin_unlock(&cifs_tcp_ses_lock);
516 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
517 /* cancel_notify_requests(tcon); */
518 if (tcon->ses && tcon->ses->server) {
519 cFYI(1, "wake up tasks now - umount begin not complete");
520 wake_up_all(&tcon->ses->server->request_q);
521 wake_up_all(&tcon->ses->server->response_q);
522 msleep(1); /* yield */
523 /* we have to kick the requests once more */
524 wake_up_all(&tcon->ses->server->response_q);
525 msleep(1);
528 return;
531 #ifdef CONFIG_CIFS_STATS2
532 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
534 /* BB FIXME */
535 return 0;
537 #endif
539 static int cifs_remount(struct super_block *sb, int *flags, char *data)
541 *flags |= MS_NODIRATIME;
542 return 0;
545 static int cifs_drop_inode(struct inode *inode)
547 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
549 /* no serverino => unconditional eviction */
550 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
551 generic_drop_inode(inode);
554 static const struct super_operations cifs_super_ops = {
555 .put_super = cifs_put_super,
556 .statfs = cifs_statfs,
557 .alloc_inode = cifs_alloc_inode,
558 .destroy_inode = cifs_destroy_inode,
559 .drop_inode = cifs_drop_inode,
560 .evict_inode = cifs_evict_inode,
561 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
562 function unless later we add lazy close of inodes or unless the
563 kernel forgets to call us with the same number of releases (closes)
564 as opens */
565 .show_options = cifs_show_options,
566 .umount_begin = cifs_umount_begin,
567 .remount_fs = cifs_remount,
568 #ifdef CONFIG_CIFS_STATS2
569 .show_stats = cifs_show_stats,
570 #endif
573 static struct dentry *
574 cifs_do_mount(struct file_system_type *fs_type,
575 int flags, const char *dev_name, void *data)
577 int rc;
578 struct super_block *sb;
580 sb = sget(fs_type, NULL, set_anon_super, NULL);
582 cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
584 if (IS_ERR(sb))
585 return ERR_CAST(sb);
587 sb->s_flags = flags;
589 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
590 if (rc) {
591 deactivate_locked_super(sb);
592 return ERR_PTR(rc);
594 sb->s_flags |= MS_ACTIVE;
595 return dget(sb->s_root);
598 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
599 unsigned long nr_segs, loff_t pos)
601 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
602 ssize_t written;
604 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
605 if (!CIFS_I(inode)->clientCanCacheAll)
606 filemap_fdatawrite(inode->i_mapping);
607 return written;
610 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
612 /* origin == SEEK_END => we must revalidate the cached file length */
613 if (origin == SEEK_END) {
614 int retval;
616 /* some applications poll for the file length in this strange
617 way so we must seek to end on non-oplocked files by
618 setting the revalidate time to zero */
619 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
621 retval = cifs_revalidate_file(file);
622 if (retval < 0)
623 return (loff_t)retval;
625 return generic_file_llseek_unlocked(file, offset, origin);
628 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
630 /* note that this is called by vfs setlease with lock_flocks held
631 to protect *lease from going away */
632 struct inode *inode = file->f_path.dentry->d_inode;
633 struct cifsFileInfo *cfile = file->private_data;
635 if (!(S_ISREG(inode->i_mode)))
636 return -EINVAL;
638 /* check if file is oplocked */
639 if (((arg == F_RDLCK) &&
640 (CIFS_I(inode)->clientCanCacheRead)) ||
641 ((arg == F_WRLCK) &&
642 (CIFS_I(inode)->clientCanCacheAll)))
643 return generic_setlease(file, arg, lease);
644 else if (tlink_tcon(cfile->tlink)->local_lease &&
645 !CIFS_I(inode)->clientCanCacheRead)
646 /* If the server claims to support oplock on this
647 file, then we still need to check oplock even
648 if the local_lease mount option is set, but there
649 are servers which do not support oplock for which
650 this mount option may be useful if the user
651 knows that the file won't be changed on the server
652 by anyone else */
653 return generic_setlease(file, arg, lease);
654 else
655 return -EAGAIN;
658 struct file_system_type cifs_fs_type = {
659 .owner = THIS_MODULE,
660 .name = "cifs",
661 .mount = cifs_do_mount,
662 .kill_sb = kill_anon_super,
663 /* .fs_flags */
665 const struct inode_operations cifs_dir_inode_ops = {
666 .create = cifs_create,
667 .lookup = cifs_lookup,
668 .getattr = cifs_getattr,
669 .unlink = cifs_unlink,
670 .link = cifs_hardlink,
671 .mkdir = cifs_mkdir,
672 .rmdir = cifs_rmdir,
673 .rename = cifs_rename,
674 .permission = cifs_permission,
675 /* revalidate:cifs_revalidate, */
676 .setattr = cifs_setattr,
677 .symlink = cifs_symlink,
678 .mknod = cifs_mknod,
679 #ifdef CONFIG_CIFS_XATTR
680 .setxattr = cifs_setxattr,
681 .getxattr = cifs_getxattr,
682 .listxattr = cifs_listxattr,
683 .removexattr = cifs_removexattr,
684 #endif
687 const struct inode_operations cifs_file_inode_ops = {
688 /* revalidate:cifs_revalidate, */
689 .setattr = cifs_setattr,
690 .getattr = cifs_getattr, /* do we need this anymore? */
691 .rename = cifs_rename,
692 .permission = cifs_permission,
693 #ifdef CONFIG_CIFS_XATTR
694 .setxattr = cifs_setxattr,
695 .getxattr = cifs_getxattr,
696 .listxattr = cifs_listxattr,
697 .removexattr = cifs_removexattr,
698 #endif
701 const struct inode_operations cifs_symlink_inode_ops = {
702 .readlink = generic_readlink,
703 .follow_link = cifs_follow_link,
704 .put_link = cifs_put_link,
705 .permission = cifs_permission,
706 /* BB add the following two eventually */
707 /* revalidate: cifs_revalidate,
708 setattr: cifs_notify_change, *//* BB do we need notify change */
709 #ifdef CONFIG_CIFS_XATTR
710 .setxattr = cifs_setxattr,
711 .getxattr = cifs_getxattr,
712 .listxattr = cifs_listxattr,
713 .removexattr = cifs_removexattr,
714 #endif
717 const struct file_operations cifs_file_ops = {
718 .read = do_sync_read,
719 .write = do_sync_write,
720 .aio_read = generic_file_aio_read,
721 .aio_write = cifs_file_aio_write,
722 .open = cifs_open,
723 .release = cifs_close,
724 .lock = cifs_lock,
725 .fsync = cifs_fsync,
726 .flush = cifs_flush,
727 .mmap = cifs_file_mmap,
728 .splice_read = generic_file_splice_read,
729 .llseek = cifs_llseek,
730 #ifdef CONFIG_CIFS_POSIX
731 .unlocked_ioctl = cifs_ioctl,
732 #endif /* CONFIG_CIFS_POSIX */
733 .setlease = cifs_setlease,
736 const struct file_operations cifs_file_strict_ops = {
737 .read = do_sync_read,
738 .write = do_sync_write,
739 .aio_read = cifs_strict_readv,
740 .aio_write = cifs_file_aio_write,
741 .open = cifs_open,
742 .release = cifs_close,
743 .lock = cifs_lock,
744 .fsync = cifs_strict_fsync,
745 .flush = cifs_flush,
746 .mmap = cifs_file_strict_mmap,
747 .splice_read = generic_file_splice_read,
748 .llseek = cifs_llseek,
749 #ifdef CONFIG_CIFS_POSIX
750 .unlocked_ioctl = cifs_ioctl,
751 #endif /* CONFIG_CIFS_POSIX */
752 .setlease = cifs_setlease,
755 const struct file_operations cifs_file_direct_ops = {
756 /* 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,
760 .open = cifs_open,
761 .release = cifs_close,
762 .lock = cifs_lock,
763 .fsync = cifs_fsync,
764 .flush = cifs_flush,
765 .mmap = cifs_file_mmap,
766 .splice_read = generic_file_splice_read,
767 #ifdef CONFIG_CIFS_POSIX
768 .unlocked_ioctl = cifs_ioctl,
769 #endif /* CONFIG_CIFS_POSIX */
770 .llseek = cifs_llseek,
771 .setlease = cifs_setlease,
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,
779 .open = cifs_open,
780 .release = cifs_close,
781 .fsync = cifs_fsync,
782 .flush = cifs_flush,
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 */
789 .setlease = cifs_setlease,
792 const struct file_operations cifs_file_strict_nobrl_ops = {
793 .read = do_sync_read,
794 .write = do_sync_write,
795 .aio_read = cifs_strict_readv,
796 .aio_write = cifs_file_aio_write,
797 .open = cifs_open,
798 .release = cifs_close,
799 .fsync = cifs_strict_fsync,
800 .flush = cifs_flush,
801 .mmap = cifs_file_strict_mmap,
802 .splice_read = generic_file_splice_read,
803 .llseek = cifs_llseek,
804 #ifdef CONFIG_CIFS_POSIX
805 .unlocked_ioctl = cifs_ioctl,
806 #endif /* CONFIG_CIFS_POSIX */
807 .setlease = cifs_setlease,
810 const struct file_operations cifs_file_direct_nobrl_ops = {
811 /* no mmap, no aio, no readv -
812 BB reevaluate whether they can be done with directio, no cache */
813 .read = cifs_user_read,
814 .write = cifs_user_write,
815 .open = cifs_open,
816 .release = cifs_close,
817 .fsync = cifs_fsync,
818 .flush = cifs_flush,
819 .mmap = cifs_file_mmap,
820 .splice_read = generic_file_splice_read,
821 #ifdef CONFIG_CIFS_POSIX
822 .unlocked_ioctl = cifs_ioctl,
823 #endif /* CONFIG_CIFS_POSIX */
824 .llseek = cifs_llseek,
825 .setlease = cifs_setlease,
828 const struct file_operations cifs_dir_ops = {
829 .readdir = cifs_readdir,
830 .release = cifs_closedir,
831 .read = generic_read_dir,
832 .unlocked_ioctl = cifs_ioctl,
833 .llseek = generic_file_llseek,
836 static void
837 cifs_init_once(void *inode)
839 struct cifsInodeInfo *cifsi = inode;
841 inode_init_once(&cifsi->vfs_inode);
842 INIT_LIST_HEAD(&cifsi->lockList);
845 static int
846 cifs_init_inodecache(void)
848 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
849 sizeof(struct cifsInodeInfo),
850 0, (SLAB_RECLAIM_ACCOUNT|
851 SLAB_MEM_SPREAD),
852 cifs_init_once);
853 if (cifs_inode_cachep == NULL)
854 return -ENOMEM;
856 return 0;
859 static void
860 cifs_destroy_inodecache(void)
862 kmem_cache_destroy(cifs_inode_cachep);
865 static int
866 cifs_init_request_bufs(void)
868 if (CIFSMaxBufSize < 8192) {
869 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
870 Unicode path name has to fit in any SMB/CIFS path based frames */
871 CIFSMaxBufSize = 8192;
872 } else if (CIFSMaxBufSize > 1024*127) {
873 CIFSMaxBufSize = 1024 * 127;
874 } else {
875 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
877 /* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
878 cifs_req_cachep = kmem_cache_create("cifs_request",
879 CIFSMaxBufSize +
880 MAX_CIFS_HDR_SIZE, 0,
881 SLAB_HWCACHE_ALIGN, NULL);
882 if (cifs_req_cachep == NULL)
883 return -ENOMEM;
885 if (cifs_min_rcv < 1)
886 cifs_min_rcv = 1;
887 else if (cifs_min_rcv > 64) {
888 cifs_min_rcv = 64;
889 cERROR(1, "cifs_min_rcv set to maximum (64)");
892 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
893 cifs_req_cachep);
895 if (cifs_req_poolp == NULL) {
896 kmem_cache_destroy(cifs_req_cachep);
897 return -ENOMEM;
899 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
900 almost all handle based requests (but not write response, nor is it
901 sufficient for path based requests). A smaller size would have
902 been more efficient (compacting multiple slab items on one 4k page)
903 for the case in which debug was on, but this larger size allows
904 more SMBs to use small buffer alloc and is still much more
905 efficient to alloc 1 per page off the slab compared to 17K (5page)
906 alloc of large cifs buffers even when page debugging is on */
907 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
908 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
909 NULL);
910 if (cifs_sm_req_cachep == NULL) {
911 mempool_destroy(cifs_req_poolp);
912 kmem_cache_destroy(cifs_req_cachep);
913 return -ENOMEM;
916 if (cifs_min_small < 2)
917 cifs_min_small = 2;
918 else if (cifs_min_small > 256) {
919 cifs_min_small = 256;
920 cFYI(1, "cifs_min_small set to maximum (256)");
923 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
924 cifs_sm_req_cachep);
926 if (cifs_sm_req_poolp == NULL) {
927 mempool_destroy(cifs_req_poolp);
928 kmem_cache_destroy(cifs_req_cachep);
929 kmem_cache_destroy(cifs_sm_req_cachep);
930 return -ENOMEM;
933 return 0;
936 static void
937 cifs_destroy_request_bufs(void)
939 mempool_destroy(cifs_req_poolp);
940 kmem_cache_destroy(cifs_req_cachep);
941 mempool_destroy(cifs_sm_req_poolp);
942 kmem_cache_destroy(cifs_sm_req_cachep);
945 static int
946 cifs_init_mids(void)
948 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
949 sizeof(struct mid_q_entry), 0,
950 SLAB_HWCACHE_ALIGN, NULL);
951 if (cifs_mid_cachep == NULL)
952 return -ENOMEM;
954 /* 3 is a reasonable minimum number of simultaneous operations */
955 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
956 if (cifs_mid_poolp == NULL) {
957 kmem_cache_destroy(cifs_mid_cachep);
958 return -ENOMEM;
961 return 0;
964 static void
965 cifs_destroy_mids(void)
967 mempool_destroy(cifs_mid_poolp);
968 kmem_cache_destroy(cifs_mid_cachep);
971 static int __init
972 init_cifs(void)
974 int rc = 0;
975 cifs_proc_init();
976 INIT_LIST_HEAD(&cifs_tcp_ses_list);
977 #ifdef CONFIG_CIFS_EXPERIMENTAL
978 INIT_LIST_HEAD(&GlobalDnotifyReqList);
979 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
980 #endif
982 * Initialize Global counters
984 atomic_set(&sesInfoAllocCount, 0);
985 atomic_set(&tconInfoAllocCount, 0);
986 atomic_set(&tcpSesAllocCount, 0);
987 atomic_set(&tcpSesReconnectCount, 0);
988 atomic_set(&tconInfoReconnectCount, 0);
990 atomic_set(&bufAllocCount, 0);
991 atomic_set(&smBufAllocCount, 0);
992 #ifdef CONFIG_CIFS_STATS2
993 atomic_set(&totBufAllocCount, 0);
994 atomic_set(&totSmBufAllocCount, 0);
995 #endif /* CONFIG_CIFS_STATS2 */
997 atomic_set(&midCount, 0);
998 GlobalCurrentXid = 0;
999 GlobalTotalActiveXid = 0;
1000 GlobalMaxActiveXid = 0;
1001 spin_lock_init(&cifs_tcp_ses_lock);
1002 spin_lock_init(&cifs_file_list_lock);
1003 spin_lock_init(&GlobalMid_Lock);
1005 if (cifs_max_pending < 2) {
1006 cifs_max_pending = 2;
1007 cFYI(1, "cifs_max_pending set to min of 2");
1008 } else if (cifs_max_pending > 256) {
1009 cifs_max_pending = 256;
1010 cFYI(1, "cifs_max_pending set to max of 256");
1013 rc = cifs_fscache_register();
1014 if (rc)
1015 goto out_clean_proc;
1017 rc = cifs_init_inodecache();
1018 if (rc)
1019 goto out_unreg_fscache;
1021 rc = cifs_init_mids();
1022 if (rc)
1023 goto out_destroy_inodecache;
1025 rc = cifs_init_request_bufs();
1026 if (rc)
1027 goto out_destroy_mids;
1029 rc = register_filesystem(&cifs_fs_type);
1030 if (rc)
1031 goto out_destroy_request_bufs;
1032 #ifdef CONFIG_CIFS_UPCALL
1033 rc = register_key_type(&cifs_spnego_key_type);
1034 if (rc)
1035 goto out_unregister_filesystem;
1036 #endif
1038 return 0;
1040 #ifdef CONFIG_CIFS_UPCALL
1041 out_unregister_filesystem:
1042 unregister_filesystem(&cifs_fs_type);
1043 #endif
1044 out_destroy_request_bufs:
1045 cifs_destroy_request_bufs();
1046 out_destroy_mids:
1047 cifs_destroy_mids();
1048 out_destroy_inodecache:
1049 cifs_destroy_inodecache();
1050 out_unreg_fscache:
1051 cifs_fscache_unregister();
1052 out_clean_proc:
1053 cifs_proc_clean();
1054 return rc;
1057 static void __exit
1058 exit_cifs(void)
1060 cFYI(DBG2, "exit_cifs");
1061 cifs_proc_clean();
1062 cifs_fscache_unregister();
1063 #ifdef CONFIG_CIFS_DFS_UPCALL
1064 cifs_dfs_release_automount_timer();
1065 #endif
1066 #ifdef CONFIG_CIFS_UPCALL
1067 unregister_key_type(&cifs_spnego_key_type);
1068 #endif
1069 unregister_filesystem(&cifs_fs_type);
1070 cifs_destroy_inodecache();
1071 cifs_destroy_mids();
1072 cifs_destroy_request_bufs();
1075 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1076 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1077 MODULE_DESCRIPTION
1078 ("VFS to access servers complying with the SNIA CIFS Specification "
1079 "e.g. Samba and Windows");
1080 MODULE_VERSION(CIFS_VERSION);
1081 module_init(init_cifs)
1082 module_exit(exit_cifs)