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;
90 __u32 cifs_lock_secret;
93 * Bumps refcount for cifs super block.
94 * Note that it should be only called if a referece to VFS super block is
95 * already held, e.g. in open-type syscalls context. Otherwise it can race with
96 * atomic_dec_and_test in deactivate_locked_super.
99 cifs_sb_active(struct super_block *sb)
101 struct cifs_sb_info *server = CIFS_SB(sb);
103 if (atomic_inc_return(&server->active) == 1)
104 atomic_inc(&sb->s_active);
108 cifs_sb_deactive(struct super_block *sb)
110 struct cifs_sb_info *server = CIFS_SB(sb);
112 if (atomic_dec_and_test(&server->active))
113 deactivate_super(sb);
117 cifs_read_super(struct super_block *sb)
120 struct cifs_sb_info *cifs_sb;
121 struct cifs_tcon *tcon;
124 cifs_sb = CIFS_SB(sb);
125 tcon = cifs_sb_master_tcon(cifs_sb);
127 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
128 sb->s_flags |= MS_POSIXACL;
130 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
131 sb->s_maxbytes = MAX_LFS_FILESIZE;
133 sb->s_maxbytes = MAX_NON_LFS;
135 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
136 sb->s_time_gran = 100;
138 sb->s_magic = CIFS_MAGIC_NUMBER;
139 sb->s_op = &cifs_super_ops;
140 sb->s_xattr = cifs_xattr_handlers;
141 sb->s_bdi = &cifs_sb->bdi;
142 sb->s_blocksize = CIFS_MAX_MSGSIZE;
143 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
144 inode = cifs_root_iget(sb);
152 sb->s_d_op = &cifs_ci_dentry_ops;
154 sb->s_d_op = &cifs_dentry_ops;
156 sb->s_root = d_make_root(inode);
162 #ifdef CONFIG_CIFS_NFSD_EXPORT
163 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
164 cifs_dbg(FYI, "export ops supported\n");
165 sb->s_export_op = &cifs_export_ops;
167 #endif /* CONFIG_CIFS_NFSD_EXPORT */
172 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
176 static void cifs_kill_sb(struct super_block *sb)
178 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
180 cifs_umount(cifs_sb);
184 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
186 struct super_block *sb = dentry->d_sb;
187 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
188 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
189 struct TCP_Server_Info *server = tcon->ses->server;
196 * PATH_MAX may be too long - it would presumably be total path,
197 * but note that some servers (includinng Samba 3) have a shorter
200 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
202 buf->f_namelen = PATH_MAX;
203 buf->f_files = 0; /* undefined */
204 buf->f_ffree = 0; /* unlimited */
206 if (server->ops->queryfs)
207 rc = server->ops->queryfs(xid, tcon, buf);
213 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
215 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
216 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
217 struct TCP_Server_Info *server = tcon->ses->server;
219 if (server->ops->fallocate)
220 return server->ops->fallocate(file, tcon, mode, off, len);
225 static int cifs_permission(struct inode *inode, int mask)
227 struct cifs_sb_info *cifs_sb;
229 cifs_sb = CIFS_SB(inode->i_sb);
231 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
232 if ((mask & MAY_EXEC) && !execute_ok(inode))
236 } else /* file mode might have been restricted at mount time
237 on the client (above and beyond ACL on servers) for
238 servers which do not support setting and viewing mode bits,
239 so allowing client to check permissions is useful */
240 return generic_permission(inode, mask);
243 static struct kmem_cache *cifs_inode_cachep;
244 static struct kmem_cache *cifs_req_cachep;
245 static struct kmem_cache *cifs_mid_cachep;
246 static struct kmem_cache *cifs_sm_req_cachep;
247 mempool_t *cifs_sm_req_poolp;
248 mempool_t *cifs_req_poolp;
249 mempool_t *cifs_mid_poolp;
251 static struct inode *
252 cifs_alloc_inode(struct super_block *sb)
254 struct cifsInodeInfo *cifs_inode;
255 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
258 cifs_inode->cifsAttrs = 0x20; /* default */
259 cifs_inode->time = 0;
261 * Until the file is open and we have gotten oplock info back from the
262 * server, can not assume caching of file data or metadata.
264 cifs_set_oplock_level(cifs_inode, 0);
265 cifs_inode->flags = 0;
266 spin_lock_init(&cifs_inode->writers_lock);
267 cifs_inode->writers = 0;
268 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
269 cifs_inode->server_eof = 0;
270 cifs_inode->uniqueid = 0;
271 cifs_inode->createtime = 0;
272 cifs_inode->epoch = 0;
273 #ifdef CONFIG_CIFS_SMB2
274 get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
277 * Can not set i_flags here - they get immediately overwritten to zero
280 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
281 INIT_LIST_HEAD(&cifs_inode->openFileList);
282 INIT_LIST_HEAD(&cifs_inode->llist);
283 return &cifs_inode->vfs_inode;
286 static void cifs_i_callback(struct rcu_head *head)
288 struct inode *inode = container_of(head, struct inode, i_rcu);
289 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
293 cifs_destroy_inode(struct inode *inode)
295 call_rcu(&inode->i_rcu, cifs_i_callback);
299 cifs_evict_inode(struct inode *inode)
301 truncate_inode_pages_final(&inode->i_data);
303 cifs_fscache_release_inode_cookie(inode);
307 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
309 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
310 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
312 seq_puts(s, ",addr=");
314 switch (server->dstaddr.ss_family) {
316 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
319 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
320 if (sa6->sin6_scope_id)
321 seq_printf(s, "%%%u", sa6->sin6_scope_id);
324 seq_puts(s, "(unknown)");
329 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
331 if (ses->sectype == Unspecified) {
332 if (ses->user_name == NULL)
333 seq_puts(s, ",sec=none");
337 seq_puts(s, ",sec=");
339 switch (ses->sectype) {
341 seq_puts(s, "lanman");
344 seq_puts(s, "ntlmv2");
353 seq_puts(s, "ntlmssp");
356 /* shouldn't ever happen */
357 seq_puts(s, "unknown");
366 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
368 seq_puts(s, ",cache=");
370 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
371 seq_puts(s, "strict");
372 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
375 seq_puts(s, "loose");
379 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
381 struct nls_table *def;
383 /* Display iocharset= option if it's not default charset */
384 def = load_nls_default();
386 seq_printf(s, ",iocharset=%s", cur->charset);
391 * cifs_show_options() is for displaying mount options in /proc/mounts.
392 * Not all settable options are displayed but most of the important
396 cifs_show_options(struct seq_file *s, struct dentry *root)
398 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
399 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
400 struct sockaddr *srcaddr;
401 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
403 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
404 cifs_show_security(s, tcon->ses);
405 cifs_show_cache_flavor(s, cifs_sb);
407 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
408 seq_puts(s, ",multiuser");
409 else if (tcon->ses->user_name)
410 seq_show_option(s, "username", tcon->ses->user_name);
412 if (tcon->ses->domainName)
413 seq_show_option(s, "domain", tcon->ses->domainName);
415 if (srcaddr->sa_family != AF_UNSPEC) {
416 struct sockaddr_in *saddr4;
417 struct sockaddr_in6 *saddr6;
418 saddr4 = (struct sockaddr_in *)srcaddr;
419 saddr6 = (struct sockaddr_in6 *)srcaddr;
420 if (srcaddr->sa_family == AF_INET6)
421 seq_printf(s, ",srcaddr=%pI6c",
423 else if (srcaddr->sa_family == AF_INET)
424 seq_printf(s, ",srcaddr=%pI4",
425 &saddr4->sin_addr.s_addr);
427 seq_printf(s, ",srcaddr=BAD-AF:%i",
428 (int)(srcaddr->sa_family));
431 seq_printf(s, ",uid=%u",
432 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
433 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
434 seq_puts(s, ",forceuid");
436 seq_puts(s, ",noforceuid");
438 seq_printf(s, ",gid=%u",
439 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
440 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
441 seq_puts(s, ",forcegid");
443 seq_puts(s, ",noforcegid");
445 cifs_show_address(s, tcon->ses->server);
448 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
449 cifs_sb->mnt_file_mode,
450 cifs_sb->mnt_dir_mode);
452 cifs_show_nls(s, cifs_sb->local_nls);
455 seq_puts(s, ",seal");
457 seq_puts(s, ",nocase");
459 seq_puts(s, ",hard");
460 if (tcon->use_persistent)
461 seq_puts(s, ",persistenthandles");
462 else if (tcon->use_resilient)
463 seq_puts(s, ",resilienthandles");
465 seq_puts(s, ",unix");
467 seq_puts(s, ",nounix");
468 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
469 seq_puts(s, ",posixpaths");
470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
471 seq_puts(s, ",setuids");
472 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
473 seq_puts(s, ",serverino");
474 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
475 seq_puts(s, ",rwpidforward");
476 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
477 seq_puts(s, ",forcemand");
478 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
479 seq_puts(s, ",nouser_xattr");
480 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
481 seq_puts(s, ",mapchars");
482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
483 seq_puts(s, ",mapposix");
484 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
487 seq_puts(s, ",nobrl");
488 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
489 seq_puts(s, ",cifsacl");
490 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
491 seq_puts(s, ",dynperm");
492 if (root->d_sb->s_flags & MS_POSIXACL)
494 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
495 seq_puts(s, ",mfsymlinks");
496 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
498 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
499 seq_puts(s, ",nostrictsync");
500 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
501 seq_puts(s, ",noperm");
502 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
503 seq_printf(s, ",backupuid=%u",
504 from_kuid_munged(&init_user_ns,
505 cifs_sb->mnt_backupuid));
506 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
507 seq_printf(s, ",backupgid=%u",
508 from_kgid_munged(&init_user_ns,
509 cifs_sb->mnt_backupgid));
511 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
512 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
513 seq_printf(s, ",echo_interval=%lu",
514 tcon->ses->server->echo_interval / HZ);
515 /* convert actimeo and display it in seconds */
516 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
521 static void cifs_umount_begin(struct super_block *sb)
523 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
524 struct cifs_tcon *tcon;
529 tcon = cifs_sb_master_tcon(cifs_sb);
531 spin_lock(&cifs_tcp_ses_lock);
532 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
533 /* we have other mounts to same share or we have
534 already tried to force umount this and woken up
535 all waiting network requests, nothing to do */
536 spin_unlock(&cifs_tcp_ses_lock);
538 } else if (tcon->tc_count == 1)
539 tcon->tidStatus = CifsExiting;
540 spin_unlock(&cifs_tcp_ses_lock);
542 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
543 /* cancel_notify_requests(tcon); */
544 if (tcon->ses && tcon->ses->server) {
545 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
546 wake_up_all(&tcon->ses->server->request_q);
547 wake_up_all(&tcon->ses->server->response_q);
548 msleep(1); /* yield */
549 /* we have to kick the requests once more */
550 wake_up_all(&tcon->ses->server->response_q);
557 #ifdef CONFIG_CIFS_STATS2
558 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
565 static int cifs_remount(struct super_block *sb, int *flags, char *data)
568 *flags |= MS_NODIRATIME;
572 static int cifs_drop_inode(struct inode *inode)
574 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
576 /* no serverino => unconditional eviction */
577 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
578 generic_drop_inode(inode);
581 static const struct super_operations cifs_super_ops = {
582 .statfs = cifs_statfs,
583 .alloc_inode = cifs_alloc_inode,
584 .destroy_inode = cifs_destroy_inode,
585 .drop_inode = cifs_drop_inode,
586 .evict_inode = cifs_evict_inode,
587 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
588 function unless later we add lazy close of inodes or unless the
589 kernel forgets to call us with the same number of releases (closes)
591 .show_options = cifs_show_options,
592 .umount_begin = cifs_umount_begin,
593 .remount_fs = cifs_remount,
594 #ifdef CONFIG_CIFS_STATS2
595 .show_stats = cifs_show_stats,
600 * Get root dentry from superblock according to prefix path mount option.
601 * Return dentry with refcount + 1 on success and NULL otherwise.
603 static struct dentry *
604 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
606 struct dentry *dentry;
607 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
608 char *full_path = NULL;
612 full_path = cifs_build_path_to_root(vol, cifs_sb,
613 cifs_sb_master_tcon(cifs_sb));
614 if (full_path == NULL)
615 return ERR_PTR(-ENOMEM);
617 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
619 sep = CIFS_DIR_SEP(cifs_sb);
620 dentry = dget(sb->s_root);
624 struct inode *dir = d_inode(dentry);
625 struct dentry *child;
629 dentry = ERR_PTR(-ENOENT);
632 if (!S_ISDIR(dir->i_mode)) {
634 dentry = ERR_PTR(-ENOTDIR);
638 /* skip separators */
645 while (*s && *s != sep)
648 child = lookup_one_len_unlocked(p, dentry, s - p);
651 } while (!IS_ERR(dentry));
656 static int cifs_set_super(struct super_block *sb, void *data)
658 struct cifs_mnt_data *mnt_data = data;
659 sb->s_fs_info = mnt_data->cifs_sb;
660 return set_anon_super(sb, NULL);
663 static struct dentry *
664 cifs_do_mount(struct file_system_type *fs_type,
665 int flags, const char *dev_name, void *data)
668 struct super_block *sb;
669 struct cifs_sb_info *cifs_sb;
670 struct smb_vol *volume_info;
671 struct cifs_mnt_data mnt_data;
674 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
676 volume_info = cifs_get_volume_info((char *)data, dev_name);
677 if (IS_ERR(volume_info))
678 return ERR_CAST(volume_info);
680 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
681 if (cifs_sb == NULL) {
682 root = ERR_PTR(-ENOMEM);
686 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
687 if (cifs_sb->mountdata == NULL) {
688 root = ERR_PTR(-ENOMEM);
692 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
698 rc = cifs_mount(cifs_sb, volume_info);
700 if (!(flags & MS_SILENT))
701 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
707 mnt_data.vol = volume_info;
708 mnt_data.cifs_sb = cifs_sb;
709 mnt_data.flags = flags;
711 /* BB should we make this contingent on mount parm? */
712 flags |= MS_NODIRATIME | MS_NOATIME;
714 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
717 cifs_umount(cifs_sb);
722 cifs_dbg(FYI, "Use existing superblock\n");
723 cifs_umount(cifs_sb);
725 rc = cifs_read_super(sb);
731 sb->s_flags |= MS_ACTIVE;
734 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
735 root = dget(sb->s_root);
737 root = cifs_get_root(volume_info, sb);
742 cifs_dbg(FYI, "dentry root is: %p\n", root);
746 deactivate_locked_super(sb);
748 cifs_cleanup_volume_info(volume_info);
752 kfree(cifs_sb->prepath);
753 kfree(cifs_sb->mountdata);
756 unload_nls(volume_info->local_nls);
761 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
764 struct inode *inode = file_inode(iocb->ki_filp);
766 if (iocb->ki_filp->f_flags & O_DIRECT)
767 return cifs_user_readv(iocb, iter);
769 rc = cifs_revalidate_mapping(inode);
773 return generic_file_read_iter(iocb, iter);
776 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
778 struct inode *inode = file_inode(iocb->ki_filp);
779 struct cifsInodeInfo *cinode = CIFS_I(inode);
783 if (iocb->ki_filp->f_flags & O_DIRECT) {
784 written = cifs_user_writev(iocb, from);
785 if (written > 0 && CIFS_CACHE_READ(cinode)) {
786 cifs_zap_mapping(inode);
788 "Set no oplock for inode=%p after a write operation\n",
795 written = cifs_get_writer(cinode);
799 written = generic_file_write_iter(iocb, from);
801 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
804 rc = filemap_fdatawrite(inode->i_mapping);
806 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
810 cifs_put_writer(cinode);
814 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
817 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
818 * the cached file length
820 if (whence != SEEK_SET && whence != SEEK_CUR) {
822 struct inode *inode = file_inode(file);
825 * We need to be sure that all dirty pages are written and the
826 * server has the newest file length.
828 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
829 inode->i_mapping->nrpages != 0) {
830 rc = filemap_fdatawait(inode->i_mapping);
832 mapping_set_error(inode->i_mapping, rc);
837 * Some applications poll for the file length in this strange
838 * way so we must seek to end on non-oplocked files by
839 * setting the revalidate time to zero.
841 CIFS_I(inode)->time = 0;
843 rc = cifs_revalidate_file_attr(file);
847 return generic_file_llseek(file, offset, whence);
851 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
854 * Note that this is called by vfs setlease with i_lock held to
855 * protect *lease from going away.
857 struct inode *inode = file_inode(file);
858 struct cifsFileInfo *cfile = file->private_data;
860 if (!(S_ISREG(inode->i_mode)))
863 /* Check if file is oplocked if this is request for new lease */
864 if (arg == F_UNLCK ||
865 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
866 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
867 return generic_setlease(file, arg, lease, priv);
868 else if (tlink_tcon(cfile->tlink)->local_lease &&
869 !CIFS_CACHE_READ(CIFS_I(inode)))
871 * If the server claims to support oplock on this file, then we
872 * still need to check oplock even if the local_lease mount
873 * option is set, but there are servers which do not support
874 * oplock for which this mount option may be useful if the user
875 * knows that the file won't be changed on the server by anyone
878 return generic_setlease(file, arg, lease, priv);
883 struct file_system_type cifs_fs_type = {
884 .owner = THIS_MODULE,
886 .mount = cifs_do_mount,
887 .kill_sb = cifs_kill_sb,
890 MODULE_ALIAS_FS("cifs");
891 const struct inode_operations cifs_dir_inode_ops = {
892 .create = cifs_create,
893 .atomic_open = cifs_atomic_open,
894 .lookup = cifs_lookup,
895 .getattr = cifs_getattr,
896 .unlink = cifs_unlink,
897 .link = cifs_hardlink,
900 .rename2 = cifs_rename2,
901 .permission = cifs_permission,
902 .setattr = cifs_setattr,
903 .symlink = cifs_symlink,
905 .setxattr = generic_setxattr,
906 .getxattr = generic_getxattr,
907 .listxattr = cifs_listxattr,
908 .removexattr = generic_removexattr,
911 const struct inode_operations cifs_file_inode_ops = {
912 .setattr = cifs_setattr,
913 .getattr = cifs_getattr,
914 .permission = cifs_permission,
915 .setxattr = generic_setxattr,
916 .getxattr = generic_getxattr,
917 .listxattr = cifs_listxattr,
918 .removexattr = generic_removexattr,
921 const struct inode_operations cifs_symlink_inode_ops = {
922 .readlink = generic_readlink,
923 .get_link = cifs_get_link,
924 .permission = cifs_permission,
925 .setxattr = generic_setxattr,
926 .getxattr = generic_getxattr,
927 .listxattr = cifs_listxattr,
928 .removexattr = generic_removexattr,
931 static int cifs_clone_file_range(struct file *src_file, loff_t off,
932 struct file *dst_file, loff_t destoff, u64 len)
934 struct inode *src_inode = file_inode(src_file);
935 struct inode *target_inode = file_inode(dst_file);
936 struct cifsFileInfo *smb_file_src = src_file->private_data;
937 struct cifsFileInfo *smb_file_target = dst_file->private_data;
938 struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
942 cifs_dbg(FYI, "clone range\n");
946 if (!src_file->private_data || !dst_file->private_data) {
948 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
953 * Note: cifs case is easier than btrfs since server responsible for
954 * checks for proper open modes and file type and if it wants
955 * server could even support copy of range where source = target
957 lock_two_nondirectories(target_inode, src_inode);
960 len = src_inode->i_size - off;
962 cifs_dbg(FYI, "about to flush pages\n");
963 /* should we flush first and last page first */
964 truncate_inode_pages_range(&target_inode->i_data, destoff,
965 PAGE_ALIGN(destoff + len)-1);
967 if (target_tcon->ses->server->ops->duplicate_extents)
968 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
969 smb_file_src, smb_file_target, off, len, destoff);
973 /* force revalidate of size and timestamps of target file now
974 that target is updated on the server */
975 CIFS_I(target_inode)->time = 0;
976 /* although unlocking in the reverse order from locking is not
977 strictly necessary here it is a little cleaner to be consistent */
978 unlock_two_nondirectories(src_inode, target_inode);
984 const struct file_operations cifs_file_ops = {
985 .read_iter = cifs_loose_read_iter,
986 .write_iter = cifs_file_write_iter,
988 .release = cifs_close,
992 .mmap = cifs_file_mmap,
993 .splice_read = generic_file_splice_read,
994 .llseek = cifs_llseek,
995 .unlocked_ioctl = cifs_ioctl,
996 .clone_file_range = cifs_clone_file_range,
997 .setlease = cifs_setlease,
998 .fallocate = cifs_fallocate,
1001 const struct file_operations cifs_file_strict_ops = {
1002 .read_iter = cifs_strict_readv,
1003 .write_iter = cifs_strict_writev,
1005 .release = cifs_close,
1007 .fsync = cifs_strict_fsync,
1008 .flush = cifs_flush,
1009 .mmap = cifs_file_strict_mmap,
1010 .splice_read = generic_file_splice_read,
1011 .llseek = cifs_llseek,
1012 .unlocked_ioctl = cifs_ioctl,
1013 .clone_file_range = cifs_clone_file_range,
1014 .setlease = cifs_setlease,
1015 .fallocate = cifs_fallocate,
1018 const struct file_operations cifs_file_direct_ops = {
1019 /* BB reevaluate whether they can be done with directio, no cache */
1020 .read_iter = cifs_user_readv,
1021 .write_iter = cifs_user_writev,
1023 .release = cifs_close,
1025 .fsync = cifs_fsync,
1026 .flush = cifs_flush,
1027 .mmap = cifs_file_mmap,
1028 .splice_read = generic_file_splice_read,
1029 .unlocked_ioctl = cifs_ioctl,
1030 .clone_file_range = cifs_clone_file_range,
1031 .llseek = cifs_llseek,
1032 .setlease = cifs_setlease,
1033 .fallocate = cifs_fallocate,
1036 const struct file_operations cifs_file_nobrl_ops = {
1037 .read_iter = cifs_loose_read_iter,
1038 .write_iter = cifs_file_write_iter,
1040 .release = cifs_close,
1041 .fsync = cifs_fsync,
1042 .flush = cifs_flush,
1043 .mmap = cifs_file_mmap,
1044 .splice_read = generic_file_splice_read,
1045 .llseek = cifs_llseek,
1046 .unlocked_ioctl = cifs_ioctl,
1047 .clone_file_range = cifs_clone_file_range,
1048 .setlease = cifs_setlease,
1049 .fallocate = cifs_fallocate,
1052 const struct file_operations cifs_file_strict_nobrl_ops = {
1053 .read_iter = cifs_strict_readv,
1054 .write_iter = cifs_strict_writev,
1056 .release = cifs_close,
1057 .fsync = cifs_strict_fsync,
1058 .flush = cifs_flush,
1059 .mmap = cifs_file_strict_mmap,
1060 .splice_read = generic_file_splice_read,
1061 .llseek = cifs_llseek,
1062 .unlocked_ioctl = cifs_ioctl,
1063 .clone_file_range = cifs_clone_file_range,
1064 .setlease = cifs_setlease,
1065 .fallocate = cifs_fallocate,
1068 const struct file_operations cifs_file_direct_nobrl_ops = {
1069 /* BB reevaluate whether they can be done with directio, no cache */
1070 .read_iter = cifs_user_readv,
1071 .write_iter = cifs_user_writev,
1073 .release = cifs_close,
1074 .fsync = cifs_fsync,
1075 .flush = cifs_flush,
1076 .mmap = cifs_file_mmap,
1077 .splice_read = generic_file_splice_read,
1078 .unlocked_ioctl = cifs_ioctl,
1079 .clone_file_range = cifs_clone_file_range,
1080 .llseek = cifs_llseek,
1081 .setlease = cifs_setlease,
1082 .fallocate = cifs_fallocate,
1085 const struct file_operations cifs_dir_ops = {
1086 .iterate_shared = cifs_readdir,
1087 .release = cifs_closedir,
1088 .read = generic_read_dir,
1089 .unlocked_ioctl = cifs_ioctl,
1090 .clone_file_range = cifs_clone_file_range,
1091 .llseek = generic_file_llseek,
1095 cifs_init_once(void *inode)
1097 struct cifsInodeInfo *cifsi = inode;
1099 inode_init_once(&cifsi->vfs_inode);
1100 init_rwsem(&cifsi->lock_sem);
1104 cifs_init_inodecache(void)
1106 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1107 sizeof(struct cifsInodeInfo),
1108 0, (SLAB_RECLAIM_ACCOUNT|
1109 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1111 if (cifs_inode_cachep == NULL)
1118 cifs_destroy_inodecache(void)
1121 * Make sure all delayed rcu free inodes are flushed before we
1125 kmem_cache_destroy(cifs_inode_cachep);
1129 cifs_init_request_bufs(void)
1131 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1132 #ifdef CONFIG_CIFS_SMB2
1134 * SMB2 maximum header size is bigger than CIFS one - no problems to
1135 * allocate some more bytes for CIFS.
1137 max_hdr_size = MAX_SMB2_HDR_SIZE;
1139 if (CIFSMaxBufSize < 8192) {
1140 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1141 Unicode path name has to fit in any SMB/CIFS path based frames */
1142 CIFSMaxBufSize = 8192;
1143 } else if (CIFSMaxBufSize > 1024*127) {
1144 CIFSMaxBufSize = 1024 * 127;
1146 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1149 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1150 CIFSMaxBufSize, CIFSMaxBufSize);
1152 cifs_req_cachep = kmem_cache_create("cifs_request",
1153 CIFSMaxBufSize + max_hdr_size, 0,
1154 SLAB_HWCACHE_ALIGN, NULL);
1155 if (cifs_req_cachep == NULL)
1158 if (cifs_min_rcv < 1)
1160 else if (cifs_min_rcv > 64) {
1162 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1165 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1168 if (cifs_req_poolp == NULL) {
1169 kmem_cache_destroy(cifs_req_cachep);
1172 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1173 almost all handle based requests (but not write response, nor is it
1174 sufficient for path based requests). A smaller size would have
1175 been more efficient (compacting multiple slab items on one 4k page)
1176 for the case in which debug was on, but this larger size allows
1177 more SMBs to use small buffer alloc and is still much more
1178 efficient to alloc 1 per page off the slab compared to 17K (5page)
1179 alloc of large cifs buffers even when page debugging is on */
1180 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1181 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1183 if (cifs_sm_req_cachep == NULL) {
1184 mempool_destroy(cifs_req_poolp);
1185 kmem_cache_destroy(cifs_req_cachep);
1189 if (cifs_min_small < 2)
1191 else if (cifs_min_small > 256) {
1192 cifs_min_small = 256;
1193 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1196 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1197 cifs_sm_req_cachep);
1199 if (cifs_sm_req_poolp == NULL) {
1200 mempool_destroy(cifs_req_poolp);
1201 kmem_cache_destroy(cifs_req_cachep);
1202 kmem_cache_destroy(cifs_sm_req_cachep);
1210 cifs_destroy_request_bufs(void)
1212 mempool_destroy(cifs_req_poolp);
1213 kmem_cache_destroy(cifs_req_cachep);
1214 mempool_destroy(cifs_sm_req_poolp);
1215 kmem_cache_destroy(cifs_sm_req_cachep);
1219 cifs_init_mids(void)
1221 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1222 sizeof(struct mid_q_entry), 0,
1223 SLAB_HWCACHE_ALIGN, NULL);
1224 if (cifs_mid_cachep == NULL)
1227 /* 3 is a reasonable minimum number of simultaneous operations */
1228 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1229 if (cifs_mid_poolp == NULL) {
1230 kmem_cache_destroy(cifs_mid_cachep);
1238 cifs_destroy_mids(void)
1240 mempool_destroy(cifs_mid_poolp);
1241 kmem_cache_destroy(cifs_mid_cachep);
1249 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1250 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1251 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1252 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1253 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1255 * Initialize Global counters
1257 atomic_set(&sesInfoAllocCount, 0);
1258 atomic_set(&tconInfoAllocCount, 0);
1259 atomic_set(&tcpSesAllocCount, 0);
1260 atomic_set(&tcpSesReconnectCount, 0);
1261 atomic_set(&tconInfoReconnectCount, 0);
1263 atomic_set(&bufAllocCount, 0);
1264 atomic_set(&smBufAllocCount, 0);
1265 #ifdef CONFIG_CIFS_STATS2
1266 atomic_set(&totBufAllocCount, 0);
1267 atomic_set(&totSmBufAllocCount, 0);
1268 #endif /* CONFIG_CIFS_STATS2 */
1270 atomic_set(&midCount, 0);
1271 GlobalCurrentXid = 0;
1272 GlobalTotalActiveXid = 0;
1273 GlobalMaxActiveXid = 0;
1274 spin_lock_init(&cifs_tcp_ses_lock);
1275 spin_lock_init(&cifs_file_list_lock);
1276 spin_lock_init(&GlobalMid_Lock);
1278 get_random_bytes(&cifs_lock_secret, sizeof(cifs_lock_secret));
1280 if (cifs_max_pending < 2) {
1281 cifs_max_pending = 2;
1282 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1283 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1284 cifs_max_pending = CIFS_MAX_REQ;
1285 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1289 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1292 goto out_clean_proc;
1295 rc = cifs_fscache_register();
1297 goto out_destroy_wq;
1299 rc = cifs_init_inodecache();
1301 goto out_unreg_fscache;
1303 rc = cifs_init_mids();
1305 goto out_destroy_inodecache;
1307 rc = cifs_init_request_bufs();
1309 goto out_destroy_mids;
1311 #ifdef CONFIG_CIFS_UPCALL
1312 rc = init_cifs_spnego();
1314 goto out_destroy_request_bufs;
1315 #endif /* CONFIG_CIFS_UPCALL */
1317 #ifdef CONFIG_CIFS_ACL
1318 rc = init_cifs_idmap();
1320 goto out_register_key_type;
1321 #endif /* CONFIG_CIFS_ACL */
1323 rc = register_filesystem(&cifs_fs_type);
1325 goto out_init_cifs_idmap;
1329 out_init_cifs_idmap:
1330 #ifdef CONFIG_CIFS_ACL
1332 out_register_key_type:
1334 #ifdef CONFIG_CIFS_UPCALL
1336 out_destroy_request_bufs:
1338 cifs_destroy_request_bufs();
1340 cifs_destroy_mids();
1341 out_destroy_inodecache:
1342 cifs_destroy_inodecache();
1344 cifs_fscache_unregister();
1346 destroy_workqueue(cifsiod_wq);
1355 cifs_dbg(NOISY, "exit_cifs\n");
1356 unregister_filesystem(&cifs_fs_type);
1357 cifs_dfs_release_automount_timer();
1358 #ifdef CONFIG_CIFS_ACL
1361 #ifdef CONFIG_CIFS_UPCALL
1362 unregister_key_type(&cifs_spnego_key_type);
1364 cifs_destroy_request_bufs();
1365 cifs_destroy_mids();
1366 cifs_destroy_inodecache();
1367 cifs_fscache_unregister();
1368 destroy_workqueue(cifsiod_wq);
1372 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1373 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1375 ("VFS to access servers complying with the SNIA CIFS Specification "
1376 "e.g. Samba and Windows");
1377 MODULE_VERSION(CIFS_VERSION);
1378 module_init(init_cifs)
1379 module_exit(exit_cifs)