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/namei.h>
39 #include <linux/random.h>
40 #include <linux/xattr.h>
44 #define DECLARE_GLOBALS_HERE
46 #include "cifsproto.h"
47 #include "cifs_debug.h"
48 #include "cifs_fs_sb.h"
50 #include <linux/key-type.h>
51 #include "cifs_spnego.h"
53 #ifdef CONFIG_CIFS_SMB2
59 bool enable_oplocks = true;
60 bool linuxExtEnabled = true;
61 bool lookupCacheEnabled = true;
62 unsigned int global_secflags = CIFSSEC_DEF;
63 /* unsigned int ntlmv2_support = 0; */
64 unsigned int sign_CIFS_PDUs = 1;
65 static const struct super_operations cifs_super_ops;
66 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
67 module_param(CIFSMaxBufSize, uint, 0);
68 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
69 "Default: 16384 Range: 8192 to 130048");
70 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
71 module_param(cifs_min_rcv, uint, 0);
72 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
74 unsigned int cifs_min_small = 30;
75 module_param(cifs_min_small, uint, 0);
76 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
78 unsigned int cifs_max_pending = CIFS_MAX_REQ;
79 module_param(cifs_max_pending, uint, 0444);
80 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
81 "Default: 32767 Range: 2 to 32767.");
82 module_param(enable_oplocks, bool, 0644);
83 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
85 extern mempool_t *cifs_sm_req_poolp;
86 extern mempool_t *cifs_req_poolp;
87 extern mempool_t *cifs_mid_poolp;
89 struct workqueue_struct *cifsiod_wq;
92 * Bumps refcount for cifs super block.
93 * Note that it should be only called if a referece to VFS super block is
94 * already held, e.g. in open-type syscalls context. Otherwise it can race with
95 * atomic_dec_and_test in deactivate_locked_super.
98 cifs_sb_active(struct super_block *sb)
100 struct cifs_sb_info *server = CIFS_SB(sb);
102 if (atomic_inc_return(&server->active) == 1)
103 atomic_inc(&sb->s_active);
107 cifs_sb_deactive(struct super_block *sb)
109 struct cifs_sb_info *server = CIFS_SB(sb);
111 if (atomic_dec_and_test(&server->active))
112 deactivate_super(sb);
116 cifs_read_super(struct super_block *sb)
119 struct cifs_sb_info *cifs_sb;
120 struct cifs_tcon *tcon;
123 cifs_sb = CIFS_SB(sb);
124 tcon = cifs_sb_master_tcon(cifs_sb);
126 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
127 sb->s_flags |= MS_POSIXACL;
129 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
130 sb->s_maxbytes = MAX_LFS_FILESIZE;
132 sb->s_maxbytes = MAX_NON_LFS;
134 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
135 sb->s_time_gran = 100;
137 sb->s_magic = CIFS_MAGIC_NUMBER;
138 sb->s_op = &cifs_super_ops;
139 sb->s_xattr = cifs_xattr_handlers;
140 sb->s_bdi = &cifs_sb->bdi;
141 sb->s_blocksize = CIFS_MAX_MSGSIZE;
142 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
143 inode = cifs_root_iget(sb);
151 sb->s_d_op = &cifs_ci_dentry_ops;
153 sb->s_d_op = &cifs_dentry_ops;
155 sb->s_root = d_make_root(inode);
161 #ifdef CONFIG_CIFS_NFSD_EXPORT
162 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
163 cifs_dbg(FYI, "export ops supported\n");
164 sb->s_export_op = &cifs_export_ops;
166 #endif /* CONFIG_CIFS_NFSD_EXPORT */
171 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
175 static void cifs_kill_sb(struct super_block *sb)
177 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
179 cifs_umount(cifs_sb);
183 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
185 struct super_block *sb = dentry->d_sb;
186 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
187 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
188 struct TCP_Server_Info *server = tcon->ses->server;
195 * PATH_MAX may be too long - it would presumably be total path,
196 * but note that some servers (includinng Samba 3) have a shorter
199 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
201 buf->f_namelen = PATH_MAX;
202 buf->f_files = 0; /* undefined */
203 buf->f_ffree = 0; /* unlimited */
205 if (server->ops->queryfs)
206 rc = server->ops->queryfs(xid, tcon, buf);
212 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
214 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
215 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
216 struct TCP_Server_Info *server = tcon->ses->server;
218 if (server->ops->fallocate)
219 return server->ops->fallocate(file, tcon, mode, off, len);
224 static int cifs_permission(struct inode *inode, int mask)
226 struct cifs_sb_info *cifs_sb;
228 cifs_sb = CIFS_SB(inode->i_sb);
230 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
231 if ((mask & MAY_EXEC) && !execute_ok(inode))
235 } else /* file mode might have been restricted at mount time
236 on the client (above and beyond ACL on servers) for
237 servers which do not support setting and viewing mode bits,
238 so allowing client to check permissions is useful */
239 return generic_permission(inode, mask);
242 static struct kmem_cache *cifs_inode_cachep;
243 static struct kmem_cache *cifs_req_cachep;
244 static struct kmem_cache *cifs_mid_cachep;
245 static struct kmem_cache *cifs_sm_req_cachep;
246 mempool_t *cifs_sm_req_poolp;
247 mempool_t *cifs_req_poolp;
248 mempool_t *cifs_mid_poolp;
250 static struct inode *
251 cifs_alloc_inode(struct super_block *sb)
253 struct cifsInodeInfo *cifs_inode;
254 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
257 cifs_inode->cifsAttrs = 0x20; /* default */
258 cifs_inode->time = 0;
260 * Until the file is open and we have gotten oplock info back from the
261 * server, can not assume caching of file data or metadata.
263 cifs_set_oplock_level(cifs_inode, 0);
264 cifs_inode->flags = 0;
265 spin_lock_init(&cifs_inode->writers_lock);
266 cifs_inode->writers = 0;
267 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
268 cifs_inode->server_eof = 0;
269 cifs_inode->uniqueid = 0;
270 cifs_inode->createtime = 0;
271 cifs_inode->epoch = 0;
272 #ifdef CONFIG_CIFS_SMB2
273 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
276 * Can not set i_flags here - they get immediately overwritten to zero
279 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
280 INIT_LIST_HEAD(&cifs_inode->openFileList);
281 INIT_LIST_HEAD(&cifs_inode->llist);
282 return &cifs_inode->vfs_inode;
285 static void cifs_i_callback(struct rcu_head *head)
287 struct inode *inode = container_of(head, struct inode, i_rcu);
288 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
292 cifs_destroy_inode(struct inode *inode)
294 call_rcu(&inode->i_rcu, cifs_i_callback);
298 cifs_evict_inode(struct inode *inode)
300 truncate_inode_pages_final(&inode->i_data);
302 cifs_fscache_release_inode_cookie(inode);
306 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
308 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
309 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
311 seq_puts(s, ",addr=");
313 switch (server->dstaddr.ss_family) {
315 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
318 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
319 if (sa6->sin6_scope_id)
320 seq_printf(s, "%%%u", sa6->sin6_scope_id);
323 seq_puts(s, "(unknown)");
328 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
330 if (ses->sectype == Unspecified) {
331 if (ses->user_name == NULL)
332 seq_puts(s, ",sec=none");
336 seq_puts(s, ",sec=");
338 switch (ses->sectype) {
340 seq_puts(s, "lanman");
343 seq_puts(s, "ntlmv2");
352 seq_puts(s, "ntlmssp");
355 /* shouldn't ever happen */
356 seq_puts(s, "unknown");
365 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
367 seq_puts(s, ",cache=");
369 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
370 seq_puts(s, "strict");
371 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
374 seq_puts(s, "loose");
378 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
380 struct nls_table *def;
382 /* Display iocharset= option if it's not default charset */
383 def = load_nls_default();
385 seq_printf(s, ",iocharset=%s", cur->charset);
390 * cifs_show_options() is for displaying mount options in /proc/mounts.
391 * Not all settable options are displayed but most of the important
395 cifs_show_options(struct seq_file *s, struct dentry *root)
397 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
398 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
399 struct sockaddr *srcaddr;
400 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
402 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
403 cifs_show_security(s, tcon->ses);
404 cifs_show_cache_flavor(s, cifs_sb);
406 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
407 seq_puts(s, ",multiuser");
408 else if (tcon->ses->user_name)
409 seq_show_option(s, "username", tcon->ses->user_name);
411 if (tcon->ses->domainName)
412 seq_show_option(s, "domain", tcon->ses->domainName);
414 if (srcaddr->sa_family != AF_UNSPEC) {
415 struct sockaddr_in *saddr4;
416 struct sockaddr_in6 *saddr6;
417 saddr4 = (struct sockaddr_in *)srcaddr;
418 saddr6 = (struct sockaddr_in6 *)srcaddr;
419 if (srcaddr->sa_family == AF_INET6)
420 seq_printf(s, ",srcaddr=%pI6c",
422 else if (srcaddr->sa_family == AF_INET)
423 seq_printf(s, ",srcaddr=%pI4",
424 &saddr4->sin_addr.s_addr);
426 seq_printf(s, ",srcaddr=BAD-AF:%i",
427 (int)(srcaddr->sa_family));
430 seq_printf(s, ",uid=%u",
431 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
432 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
433 seq_puts(s, ",forceuid");
435 seq_puts(s, ",noforceuid");
437 seq_printf(s, ",gid=%u",
438 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
439 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
440 seq_puts(s, ",forcegid");
442 seq_puts(s, ",noforcegid");
444 cifs_show_address(s, tcon->ses->server);
447 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
448 cifs_sb->mnt_file_mode,
449 cifs_sb->mnt_dir_mode);
451 cifs_show_nls(s, cifs_sb->local_nls);
454 seq_puts(s, ",seal");
456 seq_puts(s, ",nocase");
458 seq_puts(s, ",hard");
459 if (tcon->use_persistent)
460 seq_puts(s, ",persistenthandles");
461 else if (tcon->use_resilient)
462 seq_puts(s, ",resilienthandles");
464 seq_puts(s, ",unix");
466 seq_puts(s, ",nounix");
467 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
468 seq_puts(s, ",posixpaths");
469 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
470 seq_puts(s, ",setuids");
471 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
472 seq_puts(s, ",serverino");
473 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
474 seq_puts(s, ",rwpidforward");
475 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
476 seq_puts(s, ",forcemand");
477 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
478 seq_puts(s, ",nouser_xattr");
479 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
480 seq_puts(s, ",mapchars");
481 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
482 seq_puts(s, ",mapposix");
483 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
485 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
486 seq_puts(s, ",nobrl");
487 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
488 seq_puts(s, ",cifsacl");
489 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
490 seq_puts(s, ",dynperm");
491 if (root->d_sb->s_flags & MS_POSIXACL)
493 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
494 seq_puts(s, ",mfsymlinks");
495 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
497 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
498 seq_puts(s, ",nostrictsync");
499 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
500 seq_puts(s, ",noperm");
501 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
502 seq_printf(s, ",backupuid=%u",
503 from_kuid_munged(&init_user_ns,
504 cifs_sb->mnt_backupuid));
505 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
506 seq_printf(s, ",backupgid=%u",
507 from_kgid_munged(&init_user_ns,
508 cifs_sb->mnt_backupgid));
510 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
511 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
512 seq_printf(s, ",echo_interval=%lu",
513 tcon->ses->server->echo_interval / HZ);
514 /* convert actimeo and display it in seconds */
515 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
520 static void cifs_umount_begin(struct super_block *sb)
522 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
523 struct cifs_tcon *tcon;
528 tcon = cifs_sb_master_tcon(cifs_sb);
530 spin_lock(&cifs_tcp_ses_lock);
531 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
532 /* we have other mounts to same share or we have
533 already tried to force umount this and woken up
534 all waiting network requests, nothing to do */
535 spin_unlock(&cifs_tcp_ses_lock);
537 } else if (tcon->tc_count == 1)
538 tcon->tidStatus = CifsExiting;
539 spin_unlock(&cifs_tcp_ses_lock);
541 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
542 /* cancel_notify_requests(tcon); */
543 if (tcon->ses && tcon->ses->server) {
544 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
545 wake_up_all(&tcon->ses->server->request_q);
546 wake_up_all(&tcon->ses->server->response_q);
547 msleep(1); /* yield */
548 /* we have to kick the requests once more */
549 wake_up_all(&tcon->ses->server->response_q);
556 #ifdef CONFIG_CIFS_STATS2
557 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
564 static int cifs_remount(struct super_block *sb, int *flags, char *data)
567 *flags |= MS_NODIRATIME;
571 static int cifs_drop_inode(struct inode *inode)
573 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
575 /* no serverino => unconditional eviction */
576 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
577 generic_drop_inode(inode);
580 static const struct super_operations cifs_super_ops = {
581 .statfs = cifs_statfs,
582 .alloc_inode = cifs_alloc_inode,
583 .destroy_inode = cifs_destroy_inode,
584 .drop_inode = cifs_drop_inode,
585 .evict_inode = cifs_evict_inode,
586 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
587 function unless later we add lazy close of inodes or unless the
588 kernel forgets to call us with the same number of releases (closes)
590 .show_options = cifs_show_options,
591 .umount_begin = cifs_umount_begin,
592 .remount_fs = cifs_remount,
593 #ifdef CONFIG_CIFS_STATS2
594 .show_stats = cifs_show_stats,
599 * Get root dentry from superblock according to prefix path mount option.
600 * Return dentry with refcount + 1 on success and NULL otherwise.
602 static struct dentry *
603 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
605 struct dentry *dentry;
606 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
607 char *full_path = NULL;
611 full_path = cifs_build_path_to_root(vol, cifs_sb,
612 cifs_sb_master_tcon(cifs_sb));
613 if (full_path == NULL)
614 return ERR_PTR(-ENOMEM);
616 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
618 sep = CIFS_DIR_SEP(cifs_sb);
619 dentry = dget(sb->s_root);
623 struct inode *dir = d_inode(dentry);
624 struct dentry *child;
628 dentry = ERR_PTR(-ENOENT);
631 if (!S_ISDIR(dir->i_mode)) {
633 dentry = ERR_PTR(-ENOTDIR);
637 /* skip separators */
644 while (*s && *s != sep)
647 child = lookup_one_len_unlocked(p, dentry, s - p);
650 } while (!IS_ERR(dentry));
655 static int cifs_set_super(struct super_block *sb, void *data)
657 struct cifs_mnt_data *mnt_data = data;
658 sb->s_fs_info = mnt_data->cifs_sb;
659 return set_anon_super(sb, NULL);
662 static struct dentry *
663 cifs_do_mount(struct file_system_type *fs_type,
664 int flags, const char *dev_name, void *data)
667 struct super_block *sb;
668 struct cifs_sb_info *cifs_sb;
669 struct smb_vol *volume_info;
670 struct cifs_mnt_data mnt_data;
673 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
675 volume_info = cifs_get_volume_info((char *)data, dev_name);
676 if (IS_ERR(volume_info))
677 return ERR_CAST(volume_info);
679 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
680 if (cifs_sb == NULL) {
681 root = ERR_PTR(-ENOMEM);
685 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
686 if (cifs_sb->mountdata == NULL) {
687 root = ERR_PTR(-ENOMEM);
691 cifs_setup_cifs_sb(volume_info, cifs_sb);
693 rc = cifs_mount(cifs_sb, volume_info);
695 if (!(flags & MS_SILENT))
696 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
702 mnt_data.vol = volume_info;
703 mnt_data.cifs_sb = cifs_sb;
704 mnt_data.flags = flags;
706 /* BB should we make this contingent on mount parm? */
707 flags |= MS_NODIRATIME | MS_NOATIME;
709 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
712 cifs_umount(cifs_sb);
717 cifs_dbg(FYI, "Use existing superblock\n");
718 cifs_umount(cifs_sb);
720 rc = cifs_read_super(sb);
726 sb->s_flags |= MS_ACTIVE;
729 root = cifs_get_root(volume_info, sb);
733 cifs_dbg(FYI, "dentry root is: %p\n", root);
737 deactivate_locked_super(sb);
739 cifs_cleanup_volume_info(volume_info);
743 kfree(cifs_sb->mountdata);
747 unload_nls(volume_info->local_nls);
752 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
755 struct inode *inode = file_inode(iocb->ki_filp);
757 if (iocb->ki_filp->f_flags & O_DIRECT)
758 return cifs_user_readv(iocb, iter);
760 rc = cifs_revalidate_mapping(inode);
764 return generic_file_read_iter(iocb, iter);
767 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
769 struct inode *inode = file_inode(iocb->ki_filp);
770 struct cifsInodeInfo *cinode = CIFS_I(inode);
774 if (iocb->ki_filp->f_flags & O_DIRECT) {
775 written = cifs_user_writev(iocb, from);
776 if (written > 0 && CIFS_CACHE_READ(cinode)) {
777 cifs_zap_mapping(inode);
779 "Set no oplock for inode=%p after a write operation\n",
786 written = cifs_get_writer(cinode);
790 written = generic_file_write_iter(iocb, from);
792 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
795 rc = filemap_fdatawrite(inode->i_mapping);
797 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
801 cifs_put_writer(cinode);
805 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
808 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
809 * the cached file length
811 if (whence != SEEK_SET && whence != SEEK_CUR) {
813 struct inode *inode = file_inode(file);
816 * We need to be sure that all dirty pages are written and the
817 * server has the newest file length.
819 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
820 inode->i_mapping->nrpages != 0) {
821 rc = filemap_fdatawait(inode->i_mapping);
823 mapping_set_error(inode->i_mapping, rc);
828 * Some applications poll for the file length in this strange
829 * way so we must seek to end on non-oplocked files by
830 * setting the revalidate time to zero.
832 CIFS_I(inode)->time = 0;
834 rc = cifs_revalidate_file_attr(file);
838 return generic_file_llseek(file, offset, whence);
842 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
845 * Note that this is called by vfs setlease with i_lock held to
846 * protect *lease from going away.
848 struct inode *inode = file_inode(file);
849 struct cifsFileInfo *cfile = file->private_data;
851 if (!(S_ISREG(inode->i_mode)))
854 /* Check if file is oplocked if this is request for new lease */
855 if (arg == F_UNLCK ||
856 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
857 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
858 return generic_setlease(file, arg, lease, priv);
859 else if (tlink_tcon(cfile->tlink)->local_lease &&
860 !CIFS_CACHE_READ(CIFS_I(inode)))
862 * If the server claims to support oplock on this file, then we
863 * still need to check oplock even if the local_lease mount
864 * option is set, but there are servers which do not support
865 * oplock for which this mount option may be useful if the user
866 * knows that the file won't be changed on the server by anyone
869 return generic_setlease(file, arg, lease, priv);
874 struct file_system_type cifs_fs_type = {
875 .owner = THIS_MODULE,
877 .mount = cifs_do_mount,
878 .kill_sb = cifs_kill_sb,
881 MODULE_ALIAS_FS("cifs");
882 const struct inode_operations cifs_dir_inode_ops = {
883 .create = cifs_create,
884 .atomic_open = cifs_atomic_open,
885 .lookup = cifs_lookup,
886 .getattr = cifs_getattr,
887 .unlink = cifs_unlink,
888 .link = cifs_hardlink,
891 .rename2 = cifs_rename2,
892 .permission = cifs_permission,
893 .setattr = cifs_setattr,
894 .symlink = cifs_symlink,
896 .setxattr = generic_setxattr,
897 .getxattr = generic_getxattr,
898 .listxattr = cifs_listxattr,
899 .removexattr = generic_removexattr,
902 const struct inode_operations cifs_file_inode_ops = {
903 .setattr = cifs_setattr,
904 .getattr = cifs_getattr,
905 .permission = cifs_permission,
906 .setxattr = generic_setxattr,
907 .getxattr = generic_getxattr,
908 .listxattr = cifs_listxattr,
909 .removexattr = generic_removexattr,
912 const struct inode_operations cifs_symlink_inode_ops = {
913 .readlink = generic_readlink,
914 .get_link = cifs_get_link,
915 .permission = cifs_permission,
916 .setxattr = generic_setxattr,
917 .getxattr = generic_getxattr,
918 .listxattr = cifs_listxattr,
919 .removexattr = generic_removexattr,
922 static int cifs_clone_file_range(struct file *src_file, loff_t off,
923 struct file *dst_file, loff_t destoff, u64 len)
925 struct inode *src_inode = file_inode(src_file);
926 struct inode *target_inode = file_inode(dst_file);
927 struct cifsFileInfo *smb_file_src = src_file->private_data;
928 struct cifsFileInfo *smb_file_target = dst_file->private_data;
929 struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
933 cifs_dbg(FYI, "clone range\n");
937 if (!src_file->private_data || !dst_file->private_data) {
939 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
944 * Note: cifs case is easier than btrfs since server responsible for
945 * checks for proper open modes and file type and if it wants
946 * server could even support copy of range where source = target
948 lock_two_nondirectories(target_inode, src_inode);
951 len = src_inode->i_size - off;
953 cifs_dbg(FYI, "about to flush pages\n");
954 /* should we flush first and last page first */
955 truncate_inode_pages_range(&target_inode->i_data, destoff,
956 PAGE_ALIGN(destoff + len)-1);
958 if (target_tcon->ses->server->ops->duplicate_extents)
959 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
960 smb_file_src, smb_file_target, off, len, destoff);
964 /* force revalidate of size and timestamps of target file now
965 that target is updated on the server */
966 CIFS_I(target_inode)->time = 0;
967 /* although unlocking in the reverse order from locking is not
968 strictly necessary here it is a little cleaner to be consistent */
969 unlock_two_nondirectories(src_inode, target_inode);
975 const struct file_operations cifs_file_ops = {
976 .read_iter = cifs_loose_read_iter,
977 .write_iter = cifs_file_write_iter,
979 .release = cifs_close,
983 .mmap = cifs_file_mmap,
984 .splice_read = generic_file_splice_read,
985 .llseek = cifs_llseek,
986 .unlocked_ioctl = cifs_ioctl,
987 .clone_file_range = cifs_clone_file_range,
988 .setlease = cifs_setlease,
989 .fallocate = cifs_fallocate,
992 const struct file_operations cifs_file_strict_ops = {
993 .read_iter = cifs_strict_readv,
994 .write_iter = cifs_strict_writev,
996 .release = cifs_close,
998 .fsync = cifs_strict_fsync,
1000 .mmap = cifs_file_strict_mmap,
1001 .splice_read = generic_file_splice_read,
1002 .llseek = cifs_llseek,
1003 .unlocked_ioctl = cifs_ioctl,
1004 .clone_file_range = cifs_clone_file_range,
1005 .setlease = cifs_setlease,
1006 .fallocate = cifs_fallocate,
1009 const struct file_operations cifs_file_direct_ops = {
1010 /* BB reevaluate whether they can be done with directio, no cache */
1011 .read_iter = cifs_user_readv,
1012 .write_iter = cifs_user_writev,
1014 .release = cifs_close,
1016 .fsync = cifs_fsync,
1017 .flush = cifs_flush,
1018 .mmap = cifs_file_mmap,
1019 .splice_read = generic_file_splice_read,
1020 .unlocked_ioctl = cifs_ioctl,
1021 .clone_file_range = cifs_clone_file_range,
1022 .llseek = cifs_llseek,
1023 .setlease = cifs_setlease,
1024 .fallocate = cifs_fallocate,
1027 const struct file_operations cifs_file_nobrl_ops = {
1028 .read_iter = cifs_loose_read_iter,
1029 .write_iter = cifs_file_write_iter,
1031 .release = cifs_close,
1032 .fsync = cifs_fsync,
1033 .flush = cifs_flush,
1034 .mmap = cifs_file_mmap,
1035 .splice_read = generic_file_splice_read,
1036 .llseek = cifs_llseek,
1037 .unlocked_ioctl = cifs_ioctl,
1038 .clone_file_range = cifs_clone_file_range,
1039 .setlease = cifs_setlease,
1040 .fallocate = cifs_fallocate,
1043 const struct file_operations cifs_file_strict_nobrl_ops = {
1044 .read_iter = cifs_strict_readv,
1045 .write_iter = cifs_strict_writev,
1047 .release = cifs_close,
1048 .fsync = cifs_strict_fsync,
1049 .flush = cifs_flush,
1050 .mmap = cifs_file_strict_mmap,
1051 .splice_read = generic_file_splice_read,
1052 .llseek = cifs_llseek,
1053 .unlocked_ioctl = cifs_ioctl,
1054 .clone_file_range = cifs_clone_file_range,
1055 .setlease = cifs_setlease,
1056 .fallocate = cifs_fallocate,
1059 const struct file_operations cifs_file_direct_nobrl_ops = {
1060 /* BB reevaluate whether they can be done with directio, no cache */
1061 .read_iter = cifs_user_readv,
1062 .write_iter = cifs_user_writev,
1064 .release = cifs_close,
1065 .fsync = cifs_fsync,
1066 .flush = cifs_flush,
1067 .mmap = cifs_file_mmap,
1068 .splice_read = generic_file_splice_read,
1069 .unlocked_ioctl = cifs_ioctl,
1070 .clone_file_range = cifs_clone_file_range,
1071 .llseek = cifs_llseek,
1072 .setlease = cifs_setlease,
1073 .fallocate = cifs_fallocate,
1076 const struct file_operations cifs_dir_ops = {
1077 .iterate_shared = cifs_readdir,
1078 .release = cifs_closedir,
1079 .read = generic_read_dir,
1080 .unlocked_ioctl = cifs_ioctl,
1081 .clone_file_range = cifs_clone_file_range,
1082 .llseek = generic_file_llseek,
1086 cifs_init_once(void *inode)
1088 struct cifsInodeInfo *cifsi = inode;
1090 inode_init_once(&cifsi->vfs_inode);
1091 init_rwsem(&cifsi->lock_sem);
1095 cifs_init_inodecache(void)
1097 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1098 sizeof(struct cifsInodeInfo),
1099 0, (SLAB_RECLAIM_ACCOUNT|
1100 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1102 if (cifs_inode_cachep == NULL)
1109 cifs_destroy_inodecache(void)
1112 * Make sure all delayed rcu free inodes are flushed before we
1116 kmem_cache_destroy(cifs_inode_cachep);
1120 cifs_init_request_bufs(void)
1122 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1123 #ifdef CONFIG_CIFS_SMB2
1125 * SMB2 maximum header size is bigger than CIFS one - no problems to
1126 * allocate some more bytes for CIFS.
1128 max_hdr_size = MAX_SMB2_HDR_SIZE;
1130 if (CIFSMaxBufSize < 8192) {
1131 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1132 Unicode path name has to fit in any SMB/CIFS path based frames */
1133 CIFSMaxBufSize = 8192;
1134 } else if (CIFSMaxBufSize > 1024*127) {
1135 CIFSMaxBufSize = 1024 * 127;
1137 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1140 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1141 CIFSMaxBufSize, CIFSMaxBufSize);
1143 cifs_req_cachep = kmem_cache_create("cifs_request",
1144 CIFSMaxBufSize + max_hdr_size, 0,
1145 SLAB_HWCACHE_ALIGN, NULL);
1146 if (cifs_req_cachep == NULL)
1149 if (cifs_min_rcv < 1)
1151 else if (cifs_min_rcv > 64) {
1153 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1156 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1159 if (cifs_req_poolp == NULL) {
1160 kmem_cache_destroy(cifs_req_cachep);
1163 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1164 almost all handle based requests (but not write response, nor is it
1165 sufficient for path based requests). A smaller size would have
1166 been more efficient (compacting multiple slab items on one 4k page)
1167 for the case in which debug was on, but this larger size allows
1168 more SMBs to use small buffer alloc and is still much more
1169 efficient to alloc 1 per page off the slab compared to 17K (5page)
1170 alloc of large cifs buffers even when page debugging is on */
1171 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1172 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1174 if (cifs_sm_req_cachep == NULL) {
1175 mempool_destroy(cifs_req_poolp);
1176 kmem_cache_destroy(cifs_req_cachep);
1180 if (cifs_min_small < 2)
1182 else if (cifs_min_small > 256) {
1183 cifs_min_small = 256;
1184 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1187 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1188 cifs_sm_req_cachep);
1190 if (cifs_sm_req_poolp == NULL) {
1191 mempool_destroy(cifs_req_poolp);
1192 kmem_cache_destroy(cifs_req_cachep);
1193 kmem_cache_destroy(cifs_sm_req_cachep);
1201 cifs_destroy_request_bufs(void)
1203 mempool_destroy(cifs_req_poolp);
1204 kmem_cache_destroy(cifs_req_cachep);
1205 mempool_destroy(cifs_sm_req_poolp);
1206 kmem_cache_destroy(cifs_sm_req_cachep);
1210 cifs_init_mids(void)
1212 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1213 sizeof(struct mid_q_entry), 0,
1214 SLAB_HWCACHE_ALIGN, NULL);
1215 if (cifs_mid_cachep == NULL)
1218 /* 3 is a reasonable minimum number of simultaneous operations */
1219 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1220 if (cifs_mid_poolp == NULL) {
1221 kmem_cache_destroy(cifs_mid_cachep);
1229 cifs_destroy_mids(void)
1231 mempool_destroy(cifs_mid_poolp);
1232 kmem_cache_destroy(cifs_mid_cachep);
1240 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1241 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1242 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1243 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1244 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1246 * Initialize Global counters
1248 atomic_set(&sesInfoAllocCount, 0);
1249 atomic_set(&tconInfoAllocCount, 0);
1250 atomic_set(&tcpSesAllocCount, 0);
1251 atomic_set(&tcpSesReconnectCount, 0);
1252 atomic_set(&tconInfoReconnectCount, 0);
1254 atomic_set(&bufAllocCount, 0);
1255 atomic_set(&smBufAllocCount, 0);
1256 #ifdef CONFIG_CIFS_STATS2
1257 atomic_set(&totBufAllocCount, 0);
1258 atomic_set(&totSmBufAllocCount, 0);
1259 #endif /* CONFIG_CIFS_STATS2 */
1261 atomic_set(&midCount, 0);
1262 GlobalCurrentXid = 0;
1263 GlobalTotalActiveXid = 0;
1264 GlobalMaxActiveXid = 0;
1265 spin_lock_init(&cifs_tcp_ses_lock);
1266 spin_lock_init(&cifs_file_list_lock);
1267 spin_lock_init(&GlobalMid_Lock);
1269 if (cifs_max_pending < 2) {
1270 cifs_max_pending = 2;
1271 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1272 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1273 cifs_max_pending = CIFS_MAX_REQ;
1274 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1278 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1281 goto out_clean_proc;
1284 rc = cifs_fscache_register();
1286 goto out_destroy_wq;
1288 rc = cifs_init_inodecache();
1290 goto out_unreg_fscache;
1292 rc = cifs_init_mids();
1294 goto out_destroy_inodecache;
1296 rc = cifs_init_request_bufs();
1298 goto out_destroy_mids;
1300 #ifdef CONFIG_CIFS_UPCALL
1301 rc = init_cifs_spnego();
1303 goto out_destroy_request_bufs;
1304 #endif /* CONFIG_CIFS_UPCALL */
1306 #ifdef CONFIG_CIFS_ACL
1307 rc = init_cifs_idmap();
1309 goto out_register_key_type;
1310 #endif /* CONFIG_CIFS_ACL */
1312 rc = register_filesystem(&cifs_fs_type);
1314 goto out_init_cifs_idmap;
1318 out_init_cifs_idmap:
1319 #ifdef CONFIG_CIFS_ACL
1321 out_register_key_type:
1323 #ifdef CONFIG_CIFS_UPCALL
1325 out_destroy_request_bufs:
1327 cifs_destroy_request_bufs();
1329 cifs_destroy_mids();
1330 out_destroy_inodecache:
1331 cifs_destroy_inodecache();
1333 cifs_fscache_unregister();
1335 destroy_workqueue(cifsiod_wq);
1344 cifs_dbg(NOISY, "exit_cifs\n");
1345 unregister_filesystem(&cifs_fs_type);
1346 cifs_dfs_release_automount_timer();
1347 #ifdef CONFIG_CIFS_ACL
1350 #ifdef CONFIG_CIFS_UPCALL
1351 unregister_key_type(&cifs_spnego_key_type);
1353 cifs_destroy_request_bufs();
1354 cifs_destroy_mids();
1355 cifs_destroy_inodecache();
1356 cifs_fscache_unregister();
1357 destroy_workqueue(cifsiod_wq);
1361 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1362 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1364 ("VFS to access servers complying with the SNIA CIFS Specification "
1365 "e.g. Samba and Windows");
1366 MODULE_VERSION(CIFS_VERSION);
1367 module_init(init_cifs)
1368 module_exit(exit_cifs)