4 * Copyright (C) International Business Machines Corp., 2002,2008
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>
43 #define DECLARE_GLOBALS_HERE
45 #include "cifsproto.h"
46 #include "cifs_debug.h"
47 #include "cifs_fs_sb.h"
49 #include <linux/key-type.h>
50 #include "cifs_spnego.h"
52 #ifdef CONFIG_CIFS_SMB2
58 bool enable_oplocks = true;
59 unsigned int linuxExtEnabled = 1;
60 unsigned int lookupCacheEnabled = 1;
61 unsigned int global_secflags = CIFSSEC_DEF;
62 /* unsigned int ntlmv2_support = 0; */
63 unsigned int sign_CIFS_PDUs = 1;
64 static const struct super_operations cifs_super_ops;
65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
66 module_param(CIFSMaxBufSize, uint, 0);
67 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
68 "Default: 16384 Range: 8192 to 130048");
69 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
70 module_param(cifs_min_rcv, uint, 0);
71 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
73 unsigned int cifs_min_small = 30;
74 module_param(cifs_min_small, uint, 0);
75 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
77 unsigned int cifs_max_pending = CIFS_MAX_REQ;
78 module_param(cifs_max_pending, uint, 0444);
79 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
80 "Default: 32767 Range: 2 to 32767.");
81 module_param(enable_oplocks, bool, 0644);
82 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
84 extern mempool_t *cifs_sm_req_poolp;
85 extern mempool_t *cifs_req_poolp;
86 extern mempool_t *cifs_mid_poolp;
88 struct workqueue_struct *cifsiod_wq;
91 * Bumps refcount for cifs super block.
92 * Note that it should be only called if a referece to VFS super block is
93 * already held, e.g. in open-type syscalls context. Otherwise it can race with
94 * atomic_dec_and_test in deactivate_locked_super.
97 cifs_sb_active(struct super_block *sb)
99 struct cifs_sb_info *server = CIFS_SB(sb);
101 if (atomic_inc_return(&server->active) == 1)
102 atomic_inc(&sb->s_active);
106 cifs_sb_deactive(struct super_block *sb)
108 struct cifs_sb_info *server = CIFS_SB(sb);
110 if (atomic_dec_and_test(&server->active))
111 deactivate_super(sb);
115 cifs_read_super(struct super_block *sb)
118 struct cifs_sb_info *cifs_sb;
119 struct cifs_tcon *tcon;
122 cifs_sb = CIFS_SB(sb);
123 tcon = cifs_sb_master_tcon(cifs_sb);
125 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
126 sb->s_flags |= MS_POSIXACL;
128 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
129 sb->s_maxbytes = MAX_LFS_FILESIZE;
131 sb->s_maxbytes = MAX_NON_LFS;
133 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
134 sb->s_time_gran = 100;
136 sb->s_magic = CIFS_MAGIC_NUMBER;
137 sb->s_op = &cifs_super_ops;
138 sb->s_bdi = &cifs_sb->bdi;
139 sb->s_blocksize = CIFS_MAX_MSGSIZE;
140 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
141 inode = cifs_root_iget(sb);
149 sb->s_d_op = &cifs_ci_dentry_ops;
151 sb->s_d_op = &cifs_dentry_ops;
153 sb->s_root = d_make_root(inode);
159 #ifdef CONFIG_CIFS_NFSD_EXPORT
160 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
161 cifs_dbg(FYI, "export ops supported\n");
162 sb->s_export_op = &cifs_export_ops;
164 #endif /* CONFIG_CIFS_NFSD_EXPORT */
169 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
173 static void cifs_kill_sb(struct super_block *sb)
175 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
177 cifs_umount(cifs_sb);
181 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
183 struct super_block *sb = dentry->d_sb;
184 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
185 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
186 struct TCP_Server_Info *server = tcon->ses->server;
193 * PATH_MAX may be too long - it would presumably be total path,
194 * but note that some servers (includinng Samba 3) have a shorter
197 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
199 buf->f_namelen = PATH_MAX;
200 buf->f_files = 0; /* undefined */
201 buf->f_ffree = 0; /* unlimited */
203 if (server->ops->queryfs)
204 rc = server->ops->queryfs(xid, tcon, buf);
210 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
212 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
213 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
214 struct TCP_Server_Info *server = tcon->ses->server;
216 if (server->ops->fallocate)
217 return server->ops->fallocate(file, tcon, mode, off, len);
222 static int cifs_permission(struct inode *inode, int mask)
224 struct cifs_sb_info *cifs_sb;
226 cifs_sb = CIFS_SB(inode->i_sb);
228 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
229 if ((mask & MAY_EXEC) && !execute_ok(inode))
233 } else /* file mode might have been restricted at mount time
234 on the client (above and beyond ACL on servers) for
235 servers which do not support setting and viewing mode bits,
236 so allowing client to check permissions is useful */
237 return generic_permission(inode, mask);
240 static struct kmem_cache *cifs_inode_cachep;
241 static struct kmem_cache *cifs_req_cachep;
242 static struct kmem_cache *cifs_mid_cachep;
243 static struct kmem_cache *cifs_sm_req_cachep;
244 mempool_t *cifs_sm_req_poolp;
245 mempool_t *cifs_req_poolp;
246 mempool_t *cifs_mid_poolp;
248 static struct inode *
249 cifs_alloc_inode(struct super_block *sb)
251 struct cifsInodeInfo *cifs_inode;
252 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
255 cifs_inode->cifsAttrs = 0x20; /* default */
256 cifs_inode->time = 0;
258 * Until the file is open and we have gotten oplock info back from the
259 * server, can not assume caching of file data or metadata.
261 cifs_set_oplock_level(cifs_inode, 0);
262 cifs_inode->flags = 0;
263 spin_lock_init(&cifs_inode->writers_lock);
264 cifs_inode->writers = 0;
265 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
266 cifs_inode->server_eof = 0;
267 cifs_inode->uniqueid = 0;
268 cifs_inode->createtime = 0;
269 cifs_inode->epoch = 0;
270 #ifdef CONFIG_CIFS_SMB2
271 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
274 * Can not set i_flags here - they get immediately overwritten to zero
277 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
278 INIT_LIST_HEAD(&cifs_inode->openFileList);
279 INIT_LIST_HEAD(&cifs_inode->llist);
280 return &cifs_inode->vfs_inode;
283 static void cifs_i_callback(struct rcu_head *head)
285 struct inode *inode = container_of(head, struct inode, i_rcu);
286 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
290 cifs_destroy_inode(struct inode *inode)
292 call_rcu(&inode->i_rcu, cifs_i_callback);
296 cifs_evict_inode(struct inode *inode)
298 truncate_inode_pages_final(&inode->i_data);
300 cifs_fscache_release_inode_cookie(inode);
304 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
306 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
307 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
309 seq_puts(s, ",addr=");
311 switch (server->dstaddr.ss_family) {
313 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
316 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
317 if (sa6->sin6_scope_id)
318 seq_printf(s, "%%%u", sa6->sin6_scope_id);
321 seq_puts(s, "(unknown)");
326 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
328 if (ses->sectype == Unspecified) {
329 if (ses->user_name == NULL)
330 seq_puts(s, ",sec=none");
334 seq_puts(s, ",sec=");
336 switch (ses->sectype) {
338 seq_puts(s, "lanman");
341 seq_puts(s, "ntlmv2");
350 seq_puts(s, "ntlmssp");
353 /* shouldn't ever happen */
354 seq_puts(s, "unknown");
363 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
365 seq_puts(s, ",cache=");
367 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
368 seq_puts(s, "strict");
369 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
372 seq_puts(s, "loose");
376 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
378 struct nls_table *def;
380 /* Display iocharset= option if it's not default charset */
381 def = load_nls_default();
383 seq_printf(s, ",iocharset=%s", cur->charset);
388 * cifs_show_options() is for displaying mount options in /proc/mounts.
389 * Not all settable options are displayed but most of the important
393 cifs_show_options(struct seq_file *s, struct dentry *root)
395 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
396 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
397 struct sockaddr *srcaddr;
398 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
400 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
401 cifs_show_security(s, tcon->ses);
402 cifs_show_cache_flavor(s, cifs_sb);
404 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
405 seq_puts(s, ",multiuser");
406 else if (tcon->ses->user_name)
407 seq_show_option(s, "username", tcon->ses->user_name);
409 if (tcon->ses->domainName)
410 seq_show_option(s, "domain", tcon->ses->domainName);
412 if (srcaddr->sa_family != AF_UNSPEC) {
413 struct sockaddr_in *saddr4;
414 struct sockaddr_in6 *saddr6;
415 saddr4 = (struct sockaddr_in *)srcaddr;
416 saddr6 = (struct sockaddr_in6 *)srcaddr;
417 if (srcaddr->sa_family == AF_INET6)
418 seq_printf(s, ",srcaddr=%pI6c",
420 else if (srcaddr->sa_family == AF_INET)
421 seq_printf(s, ",srcaddr=%pI4",
422 &saddr4->sin_addr.s_addr);
424 seq_printf(s, ",srcaddr=BAD-AF:%i",
425 (int)(srcaddr->sa_family));
428 seq_printf(s, ",uid=%u",
429 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
430 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
431 seq_puts(s, ",forceuid");
433 seq_puts(s, ",noforceuid");
435 seq_printf(s, ",gid=%u",
436 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
437 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
438 seq_puts(s, ",forcegid");
440 seq_puts(s, ",noforcegid");
442 cifs_show_address(s, tcon->ses->server);
445 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
446 cifs_sb->mnt_file_mode,
447 cifs_sb->mnt_dir_mode);
449 cifs_show_nls(s, cifs_sb->local_nls);
452 seq_puts(s, ",seal");
454 seq_puts(s, ",nocase");
456 seq_puts(s, ",hard");
457 if (tcon->use_persistent)
458 seq_puts(s, ",persistenthandles");
459 else if (tcon->use_resilient)
460 seq_puts(s, ",resilienthandles");
462 seq_puts(s, ",unix");
464 seq_puts(s, ",nounix");
465 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
466 seq_puts(s, ",posixpaths");
467 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
468 seq_puts(s, ",setuids");
469 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
470 seq_puts(s, ",serverino");
471 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
472 seq_puts(s, ",rwpidforward");
473 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
474 seq_puts(s, ",forcemand");
475 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
476 seq_puts(s, ",nouser_xattr");
477 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
478 seq_puts(s, ",mapchars");
479 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
480 seq_puts(s, ",mapposix");
481 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
483 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
484 seq_puts(s, ",nobrl");
485 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
486 seq_puts(s, ",cifsacl");
487 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
488 seq_puts(s, ",dynperm");
489 if (root->d_sb->s_flags & MS_POSIXACL)
491 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
492 seq_puts(s, ",mfsymlinks");
493 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
495 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
496 seq_puts(s, ",nostrictsync");
497 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
498 seq_puts(s, ",noperm");
499 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
500 seq_printf(s, ",backupuid=%u",
501 from_kuid_munged(&init_user_ns,
502 cifs_sb->mnt_backupuid));
503 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
504 seq_printf(s, ",backupgid=%u",
505 from_kgid_munged(&init_user_ns,
506 cifs_sb->mnt_backupgid));
508 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
509 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
510 /* convert actimeo and display it in seconds */
511 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
516 static void cifs_umount_begin(struct super_block *sb)
518 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
519 struct cifs_tcon *tcon;
524 tcon = cifs_sb_master_tcon(cifs_sb);
526 spin_lock(&cifs_tcp_ses_lock);
527 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
528 /* we have other mounts to same share or we have
529 already tried to force umount this and woken up
530 all waiting network requests, nothing to do */
531 spin_unlock(&cifs_tcp_ses_lock);
533 } else if (tcon->tc_count == 1)
534 tcon->tidStatus = CifsExiting;
535 spin_unlock(&cifs_tcp_ses_lock);
537 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
538 /* cancel_notify_requests(tcon); */
539 if (tcon->ses && tcon->ses->server) {
540 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
541 wake_up_all(&tcon->ses->server->request_q);
542 wake_up_all(&tcon->ses->server->response_q);
543 msleep(1); /* yield */
544 /* we have to kick the requests once more */
545 wake_up_all(&tcon->ses->server->response_q);
552 #ifdef CONFIG_CIFS_STATS2
553 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
560 static int cifs_remount(struct super_block *sb, int *flags, char *data)
563 *flags |= MS_NODIRATIME;
567 static int cifs_drop_inode(struct inode *inode)
569 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
571 /* no serverino => unconditional eviction */
572 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
573 generic_drop_inode(inode);
576 static const struct super_operations cifs_super_ops = {
577 .statfs = cifs_statfs,
578 .alloc_inode = cifs_alloc_inode,
579 .destroy_inode = cifs_destroy_inode,
580 .drop_inode = cifs_drop_inode,
581 .evict_inode = cifs_evict_inode,
582 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
583 function unless later we add lazy close of inodes or unless the
584 kernel forgets to call us with the same number of releases (closes)
586 .show_options = cifs_show_options,
587 .umount_begin = cifs_umount_begin,
588 .remount_fs = cifs_remount,
589 #ifdef CONFIG_CIFS_STATS2
590 .show_stats = cifs_show_stats,
595 * Get root dentry from superblock according to prefix path mount option.
596 * Return dentry with refcount + 1 on success and NULL otherwise.
598 static struct dentry *
599 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
601 struct dentry *dentry;
602 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
603 char *full_path = NULL;
607 full_path = cifs_build_path_to_root(vol, cifs_sb,
608 cifs_sb_master_tcon(cifs_sb));
609 if (full_path == NULL)
610 return ERR_PTR(-ENOMEM);
612 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
614 sep = CIFS_DIR_SEP(cifs_sb);
615 dentry = dget(sb->s_root);
619 struct inode *dir = d_inode(dentry);
620 struct dentry *child;
624 dentry = ERR_PTR(-ENOENT);
627 if (!S_ISDIR(dir->i_mode)) {
629 dentry = ERR_PTR(-ENOTDIR);
633 /* skip separators */
640 while (*s && *s != sep)
643 mutex_lock(&dir->i_mutex);
644 child = lookup_one_len(p, dentry, s - p);
645 mutex_unlock(&dir->i_mutex);
648 } while (!IS_ERR(dentry));
653 static int cifs_set_super(struct super_block *sb, void *data)
655 struct cifs_mnt_data *mnt_data = data;
656 sb->s_fs_info = mnt_data->cifs_sb;
657 return set_anon_super(sb, NULL);
660 static struct dentry *
661 cifs_do_mount(struct file_system_type *fs_type,
662 int flags, const char *dev_name, void *data)
665 struct super_block *sb;
666 struct cifs_sb_info *cifs_sb;
667 struct smb_vol *volume_info;
668 struct cifs_mnt_data mnt_data;
671 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
673 volume_info = cifs_get_volume_info((char *)data, dev_name);
674 if (IS_ERR(volume_info))
675 return ERR_CAST(volume_info);
677 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
678 if (cifs_sb == NULL) {
679 root = ERR_PTR(-ENOMEM);
683 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
684 if (cifs_sb->mountdata == NULL) {
685 root = ERR_PTR(-ENOMEM);
689 cifs_setup_cifs_sb(volume_info, cifs_sb);
691 rc = cifs_mount(cifs_sb, volume_info);
693 if (!(flags & MS_SILENT))
694 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
700 mnt_data.vol = volume_info;
701 mnt_data.cifs_sb = cifs_sb;
702 mnt_data.flags = flags;
704 /* BB should we make this contingent on mount parm? */
705 flags |= MS_NODIRATIME | MS_NOATIME;
707 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
710 cifs_umount(cifs_sb);
715 cifs_dbg(FYI, "Use existing superblock\n");
716 cifs_umount(cifs_sb);
718 rc = cifs_read_super(sb);
724 sb->s_flags |= MS_ACTIVE;
727 root = cifs_get_root(volume_info, sb);
731 cifs_dbg(FYI, "dentry root is: %p\n", root);
735 deactivate_locked_super(sb);
737 cifs_cleanup_volume_info(volume_info);
741 kfree(cifs_sb->mountdata);
745 unload_nls(volume_info->local_nls);
750 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
753 struct inode *inode = file_inode(iocb->ki_filp);
755 rc = cifs_revalidate_mapping(inode);
759 return generic_file_read_iter(iocb, iter);
762 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
764 struct inode *inode = file_inode(iocb->ki_filp);
765 struct cifsInodeInfo *cinode = CIFS_I(inode);
769 written = cifs_get_writer(cinode);
773 written = generic_file_write_iter(iocb, from);
775 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
778 rc = filemap_fdatawrite(inode->i_mapping);
780 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
784 cifs_put_writer(cinode);
788 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
791 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
792 * the cached file length
794 if (whence != SEEK_SET && whence != SEEK_CUR) {
796 struct inode *inode = file_inode(file);
799 * We need to be sure that all dirty pages are written and the
800 * server has the newest file length.
802 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
803 inode->i_mapping->nrpages != 0) {
804 rc = filemap_fdatawait(inode->i_mapping);
806 mapping_set_error(inode->i_mapping, rc);
811 * Some applications poll for the file length in this strange
812 * way so we must seek to end on non-oplocked files by
813 * setting the revalidate time to zero.
815 CIFS_I(inode)->time = 0;
817 rc = cifs_revalidate_file_attr(file);
821 return generic_file_llseek(file, offset, whence);
825 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
828 * Note that this is called by vfs setlease with i_lock held to
829 * protect *lease from going away.
831 struct inode *inode = file_inode(file);
832 struct cifsFileInfo *cfile = file->private_data;
834 if (!(S_ISREG(inode->i_mode)))
837 /* Check if file is oplocked if this is request for new lease */
838 if (arg == F_UNLCK ||
839 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
840 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
841 return generic_setlease(file, arg, lease, priv);
842 else if (tlink_tcon(cfile->tlink)->local_lease &&
843 !CIFS_CACHE_READ(CIFS_I(inode)))
845 * If the server claims to support oplock on this file, then we
846 * still need to check oplock even if the local_lease mount
847 * option is set, but there are servers which do not support
848 * oplock for which this mount option may be useful if the user
849 * knows that the file won't be changed on the server by anyone
852 return generic_setlease(file, arg, lease, priv);
857 struct file_system_type cifs_fs_type = {
858 .owner = THIS_MODULE,
860 .mount = cifs_do_mount,
861 .kill_sb = cifs_kill_sb,
864 MODULE_ALIAS_FS("cifs");
865 const struct inode_operations cifs_dir_inode_ops = {
866 .create = cifs_create,
867 .atomic_open = cifs_atomic_open,
868 .lookup = cifs_lookup,
869 .getattr = cifs_getattr,
870 .unlink = cifs_unlink,
871 .link = cifs_hardlink,
874 .rename2 = cifs_rename2,
875 .permission = cifs_permission,
876 /* revalidate:cifs_revalidate, */
877 .setattr = cifs_setattr,
878 .symlink = cifs_symlink,
880 #ifdef CONFIG_CIFS_XATTR
881 .setxattr = cifs_setxattr,
882 .getxattr = cifs_getxattr,
883 .listxattr = cifs_listxattr,
884 .removexattr = cifs_removexattr,
888 const struct inode_operations cifs_file_inode_ops = {
889 /* revalidate:cifs_revalidate, */
890 .setattr = cifs_setattr,
891 .getattr = cifs_getattr, /* do we need this anymore? */
892 .permission = cifs_permission,
893 #ifdef CONFIG_CIFS_XATTR
894 .setxattr = cifs_setxattr,
895 .getxattr = cifs_getxattr,
896 .listxattr = cifs_listxattr,
897 .removexattr = cifs_removexattr,
901 const struct inode_operations cifs_symlink_inode_ops = {
902 .readlink = generic_readlink,
903 .get_link = cifs_get_link,
904 .permission = cifs_permission,
905 /* BB add the following two eventually */
906 /* revalidate: cifs_revalidate,
907 setattr: cifs_notify_change, *//* BB do we need notify change */
908 #ifdef CONFIG_CIFS_XATTR
909 .setxattr = cifs_setxattr,
910 .getxattr = cifs_getxattr,
911 .listxattr = cifs_listxattr,
912 .removexattr = cifs_removexattr,
916 static int cifs_clone_file_range(struct file *src_file, loff_t off,
917 struct file *dst_file, loff_t destoff, u64 len)
919 struct inode *src_inode = file_inode(src_file);
920 struct inode *target_inode = file_inode(dst_file);
921 struct cifsFileInfo *smb_file_src = src_file->private_data;
922 struct cifsFileInfo *smb_file_target = dst_file->private_data;
923 struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
927 cifs_dbg(FYI, "clone range\n");
931 if (!src_file->private_data || !dst_file->private_data) {
933 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
938 * Note: cifs case is easier than btrfs since server responsible for
939 * checks for proper open modes and file type and if it wants
940 * server could even support copy of range where source = target
942 lock_two_nondirectories(target_inode, src_inode);
945 len = src_inode->i_size - off;
947 cifs_dbg(FYI, "about to flush pages\n");
948 /* should we flush first and last page first */
949 truncate_inode_pages_range(&target_inode->i_data, destoff,
950 PAGE_CACHE_ALIGN(destoff + len)-1);
952 if (target_tcon->ses->server->ops->duplicate_extents)
953 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
954 smb_file_src, smb_file_target, off, len, destoff);
958 /* force revalidate of size and timestamps of target file now
959 that target is updated on the server */
960 CIFS_I(target_inode)->time = 0;
961 /* although unlocking in the reverse order from locking is not
962 strictly necessary here it is a little cleaner to be consistent */
963 unlock_two_nondirectories(src_inode, target_inode);
969 const struct file_operations cifs_file_ops = {
970 .read_iter = cifs_loose_read_iter,
971 .write_iter = cifs_file_write_iter,
973 .release = cifs_close,
977 .mmap = cifs_file_mmap,
978 .splice_read = generic_file_splice_read,
979 .llseek = cifs_llseek,
980 .unlocked_ioctl = cifs_ioctl,
981 .clone_file_range = cifs_clone_file_range,
982 .setlease = cifs_setlease,
983 .fallocate = cifs_fallocate,
986 const struct file_operations cifs_file_strict_ops = {
987 .read_iter = cifs_strict_readv,
988 .write_iter = cifs_strict_writev,
990 .release = cifs_close,
992 .fsync = cifs_strict_fsync,
994 .mmap = cifs_file_strict_mmap,
995 .splice_read = generic_file_splice_read,
996 .llseek = cifs_llseek,
997 .unlocked_ioctl = cifs_ioctl,
998 .clone_file_range = cifs_clone_file_range,
999 .clone_file_range = cifs_clone_file_range,
1000 .setlease = cifs_setlease,
1001 .fallocate = cifs_fallocate,
1004 const struct file_operations cifs_file_direct_ops = {
1005 /* BB reevaluate whether they can be done with directio, no cache */
1006 .read_iter = cifs_user_readv,
1007 .write_iter = cifs_user_writev,
1009 .release = cifs_close,
1011 .fsync = cifs_fsync,
1012 .flush = cifs_flush,
1013 .mmap = cifs_file_mmap,
1014 .splice_read = generic_file_splice_read,
1015 .unlocked_ioctl = cifs_ioctl,
1016 .clone_file_range = cifs_clone_file_range,
1017 .llseek = cifs_llseek,
1018 .setlease = cifs_setlease,
1019 .fallocate = cifs_fallocate,
1022 const struct file_operations cifs_file_nobrl_ops = {
1023 .read_iter = cifs_loose_read_iter,
1024 .write_iter = cifs_file_write_iter,
1026 .release = cifs_close,
1027 .fsync = cifs_fsync,
1028 .flush = cifs_flush,
1029 .mmap = cifs_file_mmap,
1030 .splice_read = generic_file_splice_read,
1031 .llseek = cifs_llseek,
1032 .unlocked_ioctl = cifs_ioctl,
1033 .clone_file_range = cifs_clone_file_range,
1034 .setlease = cifs_setlease,
1035 .fallocate = cifs_fallocate,
1038 const struct file_operations cifs_file_strict_nobrl_ops = {
1039 .read_iter = cifs_strict_readv,
1040 .write_iter = cifs_strict_writev,
1042 .release = cifs_close,
1043 .fsync = cifs_strict_fsync,
1044 .flush = cifs_flush,
1045 .mmap = cifs_file_strict_mmap,
1046 .splice_read = generic_file_splice_read,
1047 .llseek = cifs_llseek,
1048 .unlocked_ioctl = cifs_ioctl,
1049 .clone_file_range = cifs_clone_file_range,
1050 .setlease = cifs_setlease,
1051 .fallocate = cifs_fallocate,
1054 const struct file_operations cifs_file_direct_nobrl_ops = {
1055 /* BB reevaluate whether they can be done with directio, no cache */
1056 .read_iter = cifs_user_readv,
1057 .write_iter = cifs_user_writev,
1059 .release = cifs_close,
1060 .fsync = cifs_fsync,
1061 .flush = cifs_flush,
1062 .mmap = cifs_file_mmap,
1063 .splice_read = generic_file_splice_read,
1064 .unlocked_ioctl = cifs_ioctl,
1065 .clone_file_range = cifs_clone_file_range,
1066 .llseek = cifs_llseek,
1067 .setlease = cifs_setlease,
1068 .fallocate = cifs_fallocate,
1071 const struct file_operations cifs_dir_ops = {
1072 .iterate = cifs_readdir,
1073 .release = cifs_closedir,
1074 .read = generic_read_dir,
1075 .unlocked_ioctl = cifs_ioctl,
1076 .clone_file_range = cifs_clone_file_range,
1077 .llseek = generic_file_llseek,
1081 cifs_init_once(void *inode)
1083 struct cifsInodeInfo *cifsi = inode;
1085 inode_init_once(&cifsi->vfs_inode);
1086 init_rwsem(&cifsi->lock_sem);
1090 cifs_init_inodecache(void)
1092 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1093 sizeof(struct cifsInodeInfo),
1094 0, (SLAB_RECLAIM_ACCOUNT|
1095 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1097 if (cifs_inode_cachep == NULL)
1104 cifs_destroy_inodecache(void)
1107 * Make sure all delayed rcu free inodes are flushed before we
1111 kmem_cache_destroy(cifs_inode_cachep);
1115 cifs_init_request_bufs(void)
1117 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1118 #ifdef CONFIG_CIFS_SMB2
1120 * SMB2 maximum header size is bigger than CIFS one - no problems to
1121 * allocate some more bytes for CIFS.
1123 max_hdr_size = MAX_SMB2_HDR_SIZE;
1125 if (CIFSMaxBufSize < 8192) {
1126 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1127 Unicode path name has to fit in any SMB/CIFS path based frames */
1128 CIFSMaxBufSize = 8192;
1129 } else if (CIFSMaxBufSize > 1024*127) {
1130 CIFSMaxBufSize = 1024 * 127;
1132 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1135 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1136 CIFSMaxBufSize, CIFSMaxBufSize);
1138 cifs_req_cachep = kmem_cache_create("cifs_request",
1139 CIFSMaxBufSize + max_hdr_size, 0,
1140 SLAB_HWCACHE_ALIGN, NULL);
1141 if (cifs_req_cachep == NULL)
1144 if (cifs_min_rcv < 1)
1146 else if (cifs_min_rcv > 64) {
1148 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1151 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1154 if (cifs_req_poolp == NULL) {
1155 kmem_cache_destroy(cifs_req_cachep);
1158 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1159 almost all handle based requests (but not write response, nor is it
1160 sufficient for path based requests). A smaller size would have
1161 been more efficient (compacting multiple slab items on one 4k page)
1162 for the case in which debug was on, but this larger size allows
1163 more SMBs to use small buffer alloc and is still much more
1164 efficient to alloc 1 per page off the slab compared to 17K (5page)
1165 alloc of large cifs buffers even when page debugging is on */
1166 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1167 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1169 if (cifs_sm_req_cachep == NULL) {
1170 mempool_destroy(cifs_req_poolp);
1171 kmem_cache_destroy(cifs_req_cachep);
1175 if (cifs_min_small < 2)
1177 else if (cifs_min_small > 256) {
1178 cifs_min_small = 256;
1179 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1182 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1183 cifs_sm_req_cachep);
1185 if (cifs_sm_req_poolp == NULL) {
1186 mempool_destroy(cifs_req_poolp);
1187 kmem_cache_destroy(cifs_req_cachep);
1188 kmem_cache_destroy(cifs_sm_req_cachep);
1196 cifs_destroy_request_bufs(void)
1198 mempool_destroy(cifs_req_poolp);
1199 kmem_cache_destroy(cifs_req_cachep);
1200 mempool_destroy(cifs_sm_req_poolp);
1201 kmem_cache_destroy(cifs_sm_req_cachep);
1205 cifs_init_mids(void)
1207 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1208 sizeof(struct mid_q_entry), 0,
1209 SLAB_HWCACHE_ALIGN, NULL);
1210 if (cifs_mid_cachep == NULL)
1213 /* 3 is a reasonable minimum number of simultaneous operations */
1214 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1215 if (cifs_mid_poolp == NULL) {
1216 kmem_cache_destroy(cifs_mid_cachep);
1224 cifs_destroy_mids(void)
1226 mempool_destroy(cifs_mid_poolp);
1227 kmem_cache_destroy(cifs_mid_cachep);
1235 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1236 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1237 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1238 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1239 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1241 * Initialize Global counters
1243 atomic_set(&sesInfoAllocCount, 0);
1244 atomic_set(&tconInfoAllocCount, 0);
1245 atomic_set(&tcpSesAllocCount, 0);
1246 atomic_set(&tcpSesReconnectCount, 0);
1247 atomic_set(&tconInfoReconnectCount, 0);
1249 atomic_set(&bufAllocCount, 0);
1250 atomic_set(&smBufAllocCount, 0);
1251 #ifdef CONFIG_CIFS_STATS2
1252 atomic_set(&totBufAllocCount, 0);
1253 atomic_set(&totSmBufAllocCount, 0);
1254 #endif /* CONFIG_CIFS_STATS2 */
1256 atomic_set(&midCount, 0);
1257 GlobalCurrentXid = 0;
1258 GlobalTotalActiveXid = 0;
1259 GlobalMaxActiveXid = 0;
1260 spin_lock_init(&cifs_tcp_ses_lock);
1261 spin_lock_init(&cifs_file_list_lock);
1262 spin_lock_init(&GlobalMid_Lock);
1264 if (cifs_max_pending < 2) {
1265 cifs_max_pending = 2;
1266 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1267 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1268 cifs_max_pending = CIFS_MAX_REQ;
1269 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1273 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1276 goto out_clean_proc;
1279 rc = cifs_fscache_register();
1281 goto out_destroy_wq;
1283 rc = cifs_init_inodecache();
1285 goto out_unreg_fscache;
1287 rc = cifs_init_mids();
1289 goto out_destroy_inodecache;
1291 rc = cifs_init_request_bufs();
1293 goto out_destroy_mids;
1295 #ifdef CONFIG_CIFS_UPCALL
1296 rc = register_key_type(&cifs_spnego_key_type);
1298 goto out_destroy_request_bufs;
1299 #endif /* CONFIG_CIFS_UPCALL */
1301 #ifdef CONFIG_CIFS_ACL
1302 rc = init_cifs_idmap();
1304 goto out_register_key_type;
1305 #endif /* CONFIG_CIFS_ACL */
1307 rc = register_filesystem(&cifs_fs_type);
1309 goto out_init_cifs_idmap;
1313 out_init_cifs_idmap:
1314 #ifdef CONFIG_CIFS_ACL
1316 out_register_key_type:
1318 #ifdef CONFIG_CIFS_UPCALL
1319 unregister_key_type(&cifs_spnego_key_type);
1320 out_destroy_request_bufs:
1322 cifs_destroy_request_bufs();
1324 cifs_destroy_mids();
1325 out_destroy_inodecache:
1326 cifs_destroy_inodecache();
1328 cifs_fscache_unregister();
1330 destroy_workqueue(cifsiod_wq);
1339 cifs_dbg(NOISY, "exit_cifs\n");
1340 unregister_filesystem(&cifs_fs_type);
1341 cifs_dfs_release_automount_timer();
1342 #ifdef CONFIG_CIFS_ACL
1345 #ifdef CONFIG_CIFS_UPCALL
1346 unregister_key_type(&cifs_spnego_key_type);
1348 cifs_destroy_request_bufs();
1349 cifs_destroy_mids();
1350 cifs_destroy_inodecache();
1351 cifs_fscache_unregister();
1352 destroy_workqueue(cifsiod_wq);
1357 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1359 ("VFS to access servers complying with the SNIA CIFS Specification "
1360 "e.g. Samba and Windows");
1361 MODULE_VERSION(CIFS_VERSION);
1362 module_init(init_cifs)
1363 module_exit(exit_cifs)