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, 0444);
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, 0444);
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, 0444);
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 struct workqueue_struct *cifsoplockd_wq;
91 __u32 cifs_lock_secret;
94 * Bumps refcount for cifs super block.
95 * Note that it should be only called if a referece to VFS super block is
96 * already held, e.g. in open-type syscalls context. Otherwise it can race with
97 * atomic_dec_and_test in deactivate_locked_super.
100 cifs_sb_active(struct super_block *sb)
102 struct cifs_sb_info *server = CIFS_SB(sb);
104 if (atomic_inc_return(&server->active) == 1)
105 atomic_inc(&sb->s_active);
109 cifs_sb_deactive(struct super_block *sb)
111 struct cifs_sb_info *server = CIFS_SB(sb);
113 if (atomic_dec_and_test(&server->active))
114 deactivate_super(sb);
118 cifs_read_super(struct super_block *sb)
121 struct cifs_sb_info *cifs_sb;
122 struct cifs_tcon *tcon;
125 cifs_sb = CIFS_SB(sb);
126 tcon = cifs_sb_master_tcon(cifs_sb);
128 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
129 sb->s_flags |= MS_POSIXACL;
131 if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
132 sb->s_maxbytes = MAX_LFS_FILESIZE;
134 sb->s_maxbytes = MAX_NON_LFS;
136 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
137 sb->s_time_gran = 100;
139 sb->s_magic = CIFS_MAGIC_NUMBER;
140 sb->s_op = &cifs_super_ops;
141 sb->s_xattr = cifs_xattr_handlers;
142 sb->s_bdi = &cifs_sb->bdi;
143 sb->s_blocksize = CIFS_MAX_MSGSIZE;
144 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
145 inode = cifs_root_iget(sb);
153 sb->s_d_op = &cifs_ci_dentry_ops;
155 sb->s_d_op = &cifs_dentry_ops;
157 sb->s_root = d_make_root(inode);
163 #ifdef CONFIG_CIFS_NFSD_EXPORT
164 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
165 cifs_dbg(FYI, "export ops supported\n");
166 sb->s_export_op = &cifs_export_ops;
168 #endif /* CONFIG_CIFS_NFSD_EXPORT */
173 cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
177 static void cifs_kill_sb(struct super_block *sb)
179 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
181 cifs_umount(cifs_sb);
185 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
187 struct super_block *sb = dentry->d_sb;
188 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
189 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
190 struct TCP_Server_Info *server = tcon->ses->server;
197 * PATH_MAX may be too long - it would presumably be total path,
198 * but note that some servers (includinng Samba 3) have a shorter
201 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
203 buf->f_namelen = PATH_MAX;
204 buf->f_files = 0; /* undefined */
205 buf->f_ffree = 0; /* unlimited */
207 if (server->ops->queryfs)
208 rc = server->ops->queryfs(xid, tcon, buf);
214 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
216 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
217 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
218 struct TCP_Server_Info *server = tcon->ses->server;
220 if (server->ops->fallocate)
221 return server->ops->fallocate(file, tcon, mode, off, len);
226 static int cifs_permission(struct inode *inode, int mask)
228 struct cifs_sb_info *cifs_sb;
230 cifs_sb = CIFS_SB(inode->i_sb);
232 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
233 if ((mask & MAY_EXEC) && !execute_ok(inode))
237 } else /* file mode might have been restricted at mount time
238 on the client (above and beyond ACL on servers) for
239 servers which do not support setting and viewing mode bits,
240 so allowing client to check permissions is useful */
241 return generic_permission(inode, mask);
244 static struct kmem_cache *cifs_inode_cachep;
245 static struct kmem_cache *cifs_req_cachep;
246 static struct kmem_cache *cifs_mid_cachep;
247 static struct kmem_cache *cifs_sm_req_cachep;
248 mempool_t *cifs_sm_req_poolp;
249 mempool_t *cifs_req_poolp;
250 mempool_t *cifs_mid_poolp;
252 static struct inode *
253 cifs_alloc_inode(struct super_block *sb)
255 struct cifsInodeInfo *cifs_inode;
256 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
259 cifs_inode->cifsAttrs = 0x20; /* default */
260 cifs_inode->time = 0;
262 * Until the file is open and we have gotten oplock info back from the
263 * server, can not assume caching of file data or metadata.
265 cifs_set_oplock_level(cifs_inode, 0);
266 cifs_inode->flags = 0;
267 spin_lock_init(&cifs_inode->writers_lock);
268 cifs_inode->writers = 0;
269 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
270 cifs_inode->server_eof = 0;
271 cifs_inode->uniqueid = 0;
272 cifs_inode->createtime = 0;
273 cifs_inode->epoch = 0;
274 #ifdef CONFIG_CIFS_SMB2
275 generate_random_uuid(cifs_inode->lease_key);
278 * Can not set i_flags here - they get immediately overwritten to zero
281 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
282 INIT_LIST_HEAD(&cifs_inode->openFileList);
283 INIT_LIST_HEAD(&cifs_inode->llist);
284 return &cifs_inode->vfs_inode;
287 static void cifs_i_callback(struct rcu_head *head)
289 struct inode *inode = container_of(head, struct inode, i_rcu);
290 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
294 cifs_destroy_inode(struct inode *inode)
296 call_rcu(&inode->i_rcu, cifs_i_callback);
300 cifs_evict_inode(struct inode *inode)
302 truncate_inode_pages_final(&inode->i_data);
304 cifs_fscache_release_inode_cookie(inode);
308 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
310 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
311 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
313 seq_puts(s, ",addr=");
315 switch (server->dstaddr.ss_family) {
317 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
320 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
321 if (sa6->sin6_scope_id)
322 seq_printf(s, "%%%u", sa6->sin6_scope_id);
325 seq_puts(s, "(unknown)");
330 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
332 if (ses->sectype == Unspecified) {
333 if (ses->user_name == NULL)
334 seq_puts(s, ",sec=none");
338 seq_puts(s, ",sec=");
340 switch (ses->sectype) {
342 seq_puts(s, "lanman");
345 seq_puts(s, "ntlmv2");
354 seq_puts(s, "ntlmssp");
357 /* shouldn't ever happen */
358 seq_puts(s, "unknown");
367 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
369 seq_puts(s, ",cache=");
371 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
372 seq_puts(s, "strict");
373 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
376 seq_puts(s, "loose");
380 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
382 struct nls_table *def;
384 /* Display iocharset= option if it's not default charset */
385 def = load_nls_default();
387 seq_printf(s, ",iocharset=%s", cur->charset);
392 * cifs_show_options() is for displaying mount options in /proc/mounts.
393 * Not all settable options are displayed but most of the important
397 cifs_show_options(struct seq_file *s, struct dentry *root)
399 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
400 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
401 struct sockaddr *srcaddr;
402 srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
404 seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
405 cifs_show_security(s, tcon->ses);
406 cifs_show_cache_flavor(s, cifs_sb);
408 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
409 seq_puts(s, ",multiuser");
410 else if (tcon->ses->user_name)
411 seq_show_option(s, "username", tcon->ses->user_name);
413 if (tcon->ses->domainName)
414 seq_show_option(s, "domain", tcon->ses->domainName);
416 if (srcaddr->sa_family != AF_UNSPEC) {
417 struct sockaddr_in *saddr4;
418 struct sockaddr_in6 *saddr6;
419 saddr4 = (struct sockaddr_in *)srcaddr;
420 saddr6 = (struct sockaddr_in6 *)srcaddr;
421 if (srcaddr->sa_family == AF_INET6)
422 seq_printf(s, ",srcaddr=%pI6c",
424 else if (srcaddr->sa_family == AF_INET)
425 seq_printf(s, ",srcaddr=%pI4",
426 &saddr4->sin_addr.s_addr);
428 seq_printf(s, ",srcaddr=BAD-AF:%i",
429 (int)(srcaddr->sa_family));
432 seq_printf(s, ",uid=%u",
433 from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
434 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
435 seq_puts(s, ",forceuid");
437 seq_puts(s, ",noforceuid");
439 seq_printf(s, ",gid=%u",
440 from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
441 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
442 seq_puts(s, ",forcegid");
444 seq_puts(s, ",noforcegid");
446 cifs_show_address(s, tcon->ses->server);
449 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
450 cifs_sb->mnt_file_mode,
451 cifs_sb->mnt_dir_mode);
453 cifs_show_nls(s, cifs_sb->local_nls);
456 seq_puts(s, ",seal");
458 seq_puts(s, ",nocase");
460 seq_puts(s, ",hard");
461 if (tcon->use_persistent)
462 seq_puts(s, ",persistenthandles");
463 else if (tcon->use_resilient)
464 seq_puts(s, ",resilienthandles");
466 seq_puts(s, ",unix");
468 seq_puts(s, ",nounix");
469 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
470 seq_puts(s, ",posixpaths");
471 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
472 seq_puts(s, ",setuids");
473 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
474 seq_puts(s, ",idsfromsid");
475 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
476 seq_puts(s, ",serverino");
477 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
478 seq_puts(s, ",rwpidforward");
479 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
480 seq_puts(s, ",forcemand");
481 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
482 seq_puts(s, ",nouser_xattr");
483 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
484 seq_puts(s, ",mapchars");
485 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
486 seq_puts(s, ",mapposix");
487 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
489 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
490 seq_puts(s, ",nobrl");
491 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
492 seq_puts(s, ",cifsacl");
493 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
494 seq_puts(s, ",dynperm");
495 if (root->d_sb->s_flags & MS_POSIXACL)
497 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
498 seq_puts(s, ",mfsymlinks");
499 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
501 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
502 seq_puts(s, ",nostrictsync");
503 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
504 seq_puts(s, ",noperm");
505 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
506 seq_printf(s, ",backupuid=%u",
507 from_kuid_munged(&init_user_ns,
508 cifs_sb->mnt_backupuid));
509 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
510 seq_printf(s, ",backupgid=%u",
511 from_kgid_munged(&init_user_ns,
512 cifs_sb->mnt_backupgid));
514 seq_printf(s, ",rsize=%u", cifs_sb->rsize);
515 seq_printf(s, ",wsize=%u", cifs_sb->wsize);
516 seq_printf(s, ",echo_interval=%lu",
517 tcon->ses->server->echo_interval / HZ);
518 /* convert actimeo and display it in seconds */
519 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
524 static void cifs_umount_begin(struct super_block *sb)
526 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
527 struct cifs_tcon *tcon;
532 tcon = cifs_sb_master_tcon(cifs_sb);
534 spin_lock(&cifs_tcp_ses_lock);
535 if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
536 /* we have other mounts to same share or we have
537 already tried to force umount this and woken up
538 all waiting network requests, nothing to do */
539 spin_unlock(&cifs_tcp_ses_lock);
541 } else if (tcon->tc_count == 1)
542 tcon->tidStatus = CifsExiting;
543 spin_unlock(&cifs_tcp_ses_lock);
545 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
546 /* cancel_notify_requests(tcon); */
547 if (tcon->ses && tcon->ses->server) {
548 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
549 wake_up_all(&tcon->ses->server->request_q);
550 wake_up_all(&tcon->ses->server->response_q);
551 msleep(1); /* yield */
552 /* we have to kick the requests once more */
553 wake_up_all(&tcon->ses->server->response_q);
560 #ifdef CONFIG_CIFS_STATS2
561 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
568 static int cifs_remount(struct super_block *sb, int *flags, char *data)
571 *flags |= MS_NODIRATIME;
575 static int cifs_drop_inode(struct inode *inode)
577 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
579 /* no serverino => unconditional eviction */
580 return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
581 generic_drop_inode(inode);
584 static const struct super_operations cifs_super_ops = {
585 .statfs = cifs_statfs,
586 .alloc_inode = cifs_alloc_inode,
587 .destroy_inode = cifs_destroy_inode,
588 .drop_inode = cifs_drop_inode,
589 .evict_inode = cifs_evict_inode,
590 /* .delete_inode = cifs_delete_inode, */ /* Do not need above
591 function unless later we add lazy close of inodes or unless the
592 kernel forgets to call us with the same number of releases (closes)
594 .show_options = cifs_show_options,
595 .umount_begin = cifs_umount_begin,
596 .remount_fs = cifs_remount,
597 #ifdef CONFIG_CIFS_STATS2
598 .show_stats = cifs_show_stats,
603 * Get root dentry from superblock according to prefix path mount option.
604 * Return dentry with refcount + 1 on success and NULL otherwise.
606 static struct dentry *
607 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
609 struct dentry *dentry;
610 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
611 char *full_path = NULL;
615 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
616 return dget(sb->s_root);
618 full_path = cifs_build_path_to_root(vol, cifs_sb,
619 cifs_sb_master_tcon(cifs_sb));
620 if (full_path == NULL)
621 return ERR_PTR(-ENOMEM);
623 cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
625 sep = CIFS_DIR_SEP(cifs_sb);
626 dentry = dget(sb->s_root);
630 struct inode *dir = d_inode(dentry);
631 struct dentry *child;
635 dentry = ERR_PTR(-ENOENT);
638 if (!S_ISDIR(dir->i_mode)) {
640 dentry = ERR_PTR(-ENOTDIR);
644 /* skip separators */
651 while (*s && *s != sep)
654 child = lookup_one_len_unlocked(p, dentry, s - p);
657 } while (!IS_ERR(dentry));
662 static int cifs_set_super(struct super_block *sb, void *data)
664 struct cifs_mnt_data *mnt_data = data;
665 sb->s_fs_info = mnt_data->cifs_sb;
666 return set_anon_super(sb, NULL);
669 static struct dentry *
670 cifs_do_mount(struct file_system_type *fs_type,
671 int flags, const char *dev_name, void *data)
674 struct super_block *sb;
675 struct cifs_sb_info *cifs_sb;
676 struct smb_vol *volume_info;
677 struct cifs_mnt_data mnt_data;
680 cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
682 volume_info = cifs_get_volume_info((char *)data, dev_name);
683 if (IS_ERR(volume_info))
684 return ERR_CAST(volume_info);
686 cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
687 if (cifs_sb == NULL) {
688 root = ERR_PTR(-ENOMEM);
692 cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
693 if (cifs_sb->mountdata == NULL) {
694 root = ERR_PTR(-ENOMEM);
698 rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
704 rc = cifs_mount(cifs_sb, volume_info);
706 if (!(flags & MS_SILENT))
707 cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
713 mnt_data.vol = volume_info;
714 mnt_data.cifs_sb = cifs_sb;
715 mnt_data.flags = flags;
717 /* BB should we make this contingent on mount parm? */
718 flags |= MS_NODIRATIME | MS_NOATIME;
720 sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
723 cifs_umount(cifs_sb);
728 cifs_dbg(FYI, "Use existing superblock\n");
729 cifs_umount(cifs_sb);
731 rc = cifs_read_super(sb);
737 sb->s_flags |= MS_ACTIVE;
740 root = cifs_get_root(volume_info, sb);
744 cifs_dbg(FYI, "dentry root is: %p\n", root);
748 deactivate_locked_super(sb);
751 cifs_cleanup_volume_info(volume_info);
755 kfree(cifs_sb->prepath);
756 kfree(cifs_sb->mountdata);
759 unload_nls(volume_info->local_nls);
764 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
767 struct inode *inode = file_inode(iocb->ki_filp);
769 if (iocb->ki_flags & IOCB_DIRECT)
770 return cifs_user_readv(iocb, iter);
772 rc = cifs_revalidate_mapping(inode);
776 return generic_file_read_iter(iocb, iter);
779 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
781 struct inode *inode = file_inode(iocb->ki_filp);
782 struct cifsInodeInfo *cinode = CIFS_I(inode);
786 if (iocb->ki_filp->f_flags & O_DIRECT) {
787 written = cifs_user_writev(iocb, from);
788 if (written > 0 && CIFS_CACHE_READ(cinode)) {
789 cifs_zap_mapping(inode);
791 "Set no oplock for inode=%p after a write operation\n",
798 written = cifs_get_writer(cinode);
802 written = generic_file_write_iter(iocb, from);
804 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
807 rc = filemap_fdatawrite(inode->i_mapping);
809 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
813 cifs_put_writer(cinode);
817 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
820 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
821 * the cached file length
823 if (whence != SEEK_SET && whence != SEEK_CUR) {
825 struct inode *inode = file_inode(file);
828 * We need to be sure that all dirty pages are written and the
829 * server has the newest file length.
831 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
832 inode->i_mapping->nrpages != 0) {
833 rc = filemap_fdatawait(inode->i_mapping);
835 mapping_set_error(inode->i_mapping, rc);
840 * Some applications poll for the file length in this strange
841 * way so we must seek to end on non-oplocked files by
842 * setting the revalidate time to zero.
844 CIFS_I(inode)->time = 0;
846 rc = cifs_revalidate_file_attr(file);
850 return generic_file_llseek(file, offset, whence);
854 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
857 * Note that this is called by vfs setlease with i_lock held to
858 * protect *lease from going away.
860 struct inode *inode = file_inode(file);
861 struct cifsFileInfo *cfile = file->private_data;
863 if (!(S_ISREG(inode->i_mode)))
866 /* Check if file is oplocked if this is request for new lease */
867 if (arg == F_UNLCK ||
868 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
869 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
870 return generic_setlease(file, arg, lease, priv);
871 else if (tlink_tcon(cfile->tlink)->local_lease &&
872 !CIFS_CACHE_READ(CIFS_I(inode)))
874 * If the server claims to support oplock on this file, then we
875 * still need to check oplock even if the local_lease mount
876 * option is set, but there are servers which do not support
877 * oplock for which this mount option may be useful if the user
878 * knows that the file won't be changed on the server by anyone
881 return generic_setlease(file, arg, lease, priv);
886 struct file_system_type cifs_fs_type = {
887 .owner = THIS_MODULE,
889 .mount = cifs_do_mount,
890 .kill_sb = cifs_kill_sb,
893 MODULE_ALIAS_FS("cifs");
894 const struct inode_operations cifs_dir_inode_ops = {
895 .create = cifs_create,
896 .atomic_open = cifs_atomic_open,
897 .lookup = cifs_lookup,
898 .getattr = cifs_getattr,
899 .unlink = cifs_unlink,
900 .link = cifs_hardlink,
903 .rename = cifs_rename2,
904 .permission = cifs_permission,
905 .setattr = cifs_setattr,
906 .symlink = cifs_symlink,
908 .listxattr = cifs_listxattr,
911 const struct inode_operations cifs_file_inode_ops = {
912 .setattr = cifs_setattr,
913 .getattr = cifs_getattr,
914 .permission = cifs_permission,
915 .listxattr = cifs_listxattr,
918 const struct inode_operations cifs_symlink_inode_ops = {
919 .readlink = generic_readlink,
920 .get_link = cifs_get_link,
921 .permission = cifs_permission,
922 .listxattr = cifs_listxattr,
925 static int cifs_clone_file_range(struct file *src_file, loff_t off,
926 struct file *dst_file, loff_t destoff, u64 len)
928 struct inode *src_inode = file_inode(src_file);
929 struct inode *target_inode = file_inode(dst_file);
930 struct cifsFileInfo *smb_file_src = src_file->private_data;
931 struct cifsFileInfo *smb_file_target;
932 struct cifs_tcon *target_tcon;
936 cifs_dbg(FYI, "clone range\n");
940 if (!src_file->private_data || !dst_file->private_data) {
942 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
946 smb_file_target = dst_file->private_data;
947 target_tcon = tlink_tcon(smb_file_target->tlink);
950 * Note: cifs case is easier than btrfs since server responsible for
951 * checks for proper open modes and file type and if it wants
952 * server could even support copy of range where source = target
954 lock_two_nondirectories(target_inode, src_inode);
957 len = src_inode->i_size - off;
959 cifs_dbg(FYI, "about to flush pages\n");
960 /* should we flush first and last page first */
961 truncate_inode_pages_range(&target_inode->i_data, destoff,
962 PAGE_ALIGN(destoff + len)-1);
964 if (target_tcon->ses->server->ops->duplicate_extents)
965 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
966 smb_file_src, smb_file_target, off, len, destoff);
970 /* force revalidate of size and timestamps of target file now
971 that target is updated on the server */
972 CIFS_I(target_inode)->time = 0;
973 /* although unlocking in the reverse order from locking is not
974 strictly necessary here it is a little cleaner to be consistent */
975 unlock_two_nondirectories(src_inode, target_inode);
981 const struct file_operations cifs_file_ops = {
982 .read_iter = cifs_loose_read_iter,
983 .write_iter = cifs_file_write_iter,
985 .release = cifs_close,
989 .mmap = cifs_file_mmap,
990 .splice_read = generic_file_splice_read,
991 .llseek = cifs_llseek,
992 .unlocked_ioctl = cifs_ioctl,
993 .clone_file_range = cifs_clone_file_range,
994 .setlease = cifs_setlease,
995 .fallocate = cifs_fallocate,
998 const struct file_operations cifs_file_strict_ops = {
999 .read_iter = cifs_strict_readv,
1000 .write_iter = cifs_strict_writev,
1002 .release = cifs_close,
1004 .fsync = cifs_strict_fsync,
1005 .flush = cifs_flush,
1006 .mmap = cifs_file_strict_mmap,
1007 .splice_read = generic_file_splice_read,
1008 .llseek = cifs_llseek,
1009 .unlocked_ioctl = cifs_ioctl,
1010 .clone_file_range = cifs_clone_file_range,
1011 .setlease = cifs_setlease,
1012 .fallocate = cifs_fallocate,
1015 const struct file_operations cifs_file_direct_ops = {
1016 /* BB reevaluate whether they can be done with directio, no cache */
1017 .read_iter = cifs_user_readv,
1018 .write_iter = cifs_user_writev,
1020 .release = cifs_close,
1022 .fsync = cifs_fsync,
1023 .flush = cifs_flush,
1024 .mmap = cifs_file_mmap,
1025 .splice_read = generic_file_splice_read,
1026 .unlocked_ioctl = cifs_ioctl,
1027 .clone_file_range = cifs_clone_file_range,
1028 .llseek = cifs_llseek,
1029 .setlease = cifs_setlease,
1030 .fallocate = cifs_fallocate,
1033 const struct file_operations cifs_file_nobrl_ops = {
1034 .read_iter = cifs_loose_read_iter,
1035 .write_iter = cifs_file_write_iter,
1037 .release = cifs_close,
1038 .fsync = cifs_fsync,
1039 .flush = cifs_flush,
1040 .mmap = cifs_file_mmap,
1041 .splice_read = generic_file_splice_read,
1042 .llseek = cifs_llseek,
1043 .unlocked_ioctl = cifs_ioctl,
1044 .clone_file_range = cifs_clone_file_range,
1045 .setlease = cifs_setlease,
1046 .fallocate = cifs_fallocate,
1049 const struct file_operations cifs_file_strict_nobrl_ops = {
1050 .read_iter = cifs_strict_readv,
1051 .write_iter = cifs_strict_writev,
1053 .release = cifs_close,
1054 .fsync = cifs_strict_fsync,
1055 .flush = cifs_flush,
1056 .mmap = cifs_file_strict_mmap,
1057 .splice_read = generic_file_splice_read,
1058 .llseek = cifs_llseek,
1059 .unlocked_ioctl = cifs_ioctl,
1060 .clone_file_range = cifs_clone_file_range,
1061 .setlease = cifs_setlease,
1062 .fallocate = cifs_fallocate,
1065 const struct file_operations cifs_file_direct_nobrl_ops = {
1066 /* BB reevaluate whether they can be done with directio, no cache */
1067 .read_iter = cifs_user_readv,
1068 .write_iter = cifs_user_writev,
1070 .release = cifs_close,
1071 .fsync = cifs_fsync,
1072 .flush = cifs_flush,
1073 .mmap = cifs_file_mmap,
1074 .splice_read = generic_file_splice_read,
1075 .unlocked_ioctl = cifs_ioctl,
1076 .clone_file_range = cifs_clone_file_range,
1077 .llseek = cifs_llseek,
1078 .setlease = cifs_setlease,
1079 .fallocate = cifs_fallocate,
1082 const struct file_operations cifs_dir_ops = {
1083 .iterate_shared = cifs_readdir,
1084 .release = cifs_closedir,
1085 .read = generic_read_dir,
1086 .unlocked_ioctl = cifs_ioctl,
1087 .clone_file_range = cifs_clone_file_range,
1088 .llseek = generic_file_llseek,
1092 cifs_init_once(void *inode)
1094 struct cifsInodeInfo *cifsi = inode;
1096 inode_init_once(&cifsi->vfs_inode);
1097 init_rwsem(&cifsi->lock_sem);
1101 cifs_init_inodecache(void)
1103 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1104 sizeof(struct cifsInodeInfo),
1105 0, (SLAB_RECLAIM_ACCOUNT|
1106 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1108 if (cifs_inode_cachep == NULL)
1115 cifs_destroy_inodecache(void)
1118 * Make sure all delayed rcu free inodes are flushed before we
1122 kmem_cache_destroy(cifs_inode_cachep);
1126 cifs_init_request_bufs(void)
1128 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1129 #ifdef CONFIG_CIFS_SMB2
1131 * SMB2 maximum header size is bigger than CIFS one - no problems to
1132 * allocate some more bytes for CIFS.
1134 max_hdr_size = MAX_SMB2_HDR_SIZE;
1136 if (CIFSMaxBufSize < 8192) {
1137 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1138 Unicode path name has to fit in any SMB/CIFS path based frames */
1139 CIFSMaxBufSize = 8192;
1140 } else if (CIFSMaxBufSize > 1024*127) {
1141 CIFSMaxBufSize = 1024 * 127;
1143 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1146 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1147 CIFSMaxBufSize, CIFSMaxBufSize);
1149 cifs_req_cachep = kmem_cache_create("cifs_request",
1150 CIFSMaxBufSize + max_hdr_size, 0,
1151 SLAB_HWCACHE_ALIGN, NULL);
1152 if (cifs_req_cachep == NULL)
1155 if (cifs_min_rcv < 1)
1157 else if (cifs_min_rcv > 64) {
1159 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1162 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1165 if (cifs_req_poolp == NULL) {
1166 kmem_cache_destroy(cifs_req_cachep);
1169 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1170 almost all handle based requests (but not write response, nor is it
1171 sufficient for path based requests). A smaller size would have
1172 been more efficient (compacting multiple slab items on one 4k page)
1173 for the case in which debug was on, but this larger size allows
1174 more SMBs to use small buffer alloc and is still much more
1175 efficient to alloc 1 per page off the slab compared to 17K (5page)
1176 alloc of large cifs buffers even when page debugging is on */
1177 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1178 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1180 if (cifs_sm_req_cachep == NULL) {
1181 mempool_destroy(cifs_req_poolp);
1182 kmem_cache_destroy(cifs_req_cachep);
1186 if (cifs_min_small < 2)
1188 else if (cifs_min_small > 256) {
1189 cifs_min_small = 256;
1190 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1193 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1194 cifs_sm_req_cachep);
1196 if (cifs_sm_req_poolp == NULL) {
1197 mempool_destroy(cifs_req_poolp);
1198 kmem_cache_destroy(cifs_req_cachep);
1199 kmem_cache_destroy(cifs_sm_req_cachep);
1207 cifs_destroy_request_bufs(void)
1209 mempool_destroy(cifs_req_poolp);
1210 kmem_cache_destroy(cifs_req_cachep);
1211 mempool_destroy(cifs_sm_req_poolp);
1212 kmem_cache_destroy(cifs_sm_req_cachep);
1216 cifs_init_mids(void)
1218 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1219 sizeof(struct mid_q_entry), 0,
1220 SLAB_HWCACHE_ALIGN, NULL);
1221 if (cifs_mid_cachep == NULL)
1224 /* 3 is a reasonable minimum number of simultaneous operations */
1225 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1226 if (cifs_mid_poolp == NULL) {
1227 kmem_cache_destroy(cifs_mid_cachep);
1235 cifs_destroy_mids(void)
1237 mempool_destroy(cifs_mid_poolp);
1238 kmem_cache_destroy(cifs_mid_cachep);
1246 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1247 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1248 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1249 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1250 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1252 * Initialize Global counters
1254 atomic_set(&sesInfoAllocCount, 0);
1255 atomic_set(&tconInfoAllocCount, 0);
1256 atomic_set(&tcpSesAllocCount, 0);
1257 atomic_set(&tcpSesReconnectCount, 0);
1258 atomic_set(&tconInfoReconnectCount, 0);
1260 atomic_set(&bufAllocCount, 0);
1261 atomic_set(&smBufAllocCount, 0);
1262 #ifdef CONFIG_CIFS_STATS2
1263 atomic_set(&totBufAllocCount, 0);
1264 atomic_set(&totSmBufAllocCount, 0);
1265 #endif /* CONFIG_CIFS_STATS2 */
1267 atomic_set(&midCount, 0);
1268 GlobalCurrentXid = 0;
1269 GlobalTotalActiveXid = 0;
1270 GlobalMaxActiveXid = 0;
1271 spin_lock_init(&cifs_tcp_ses_lock);
1272 spin_lock_init(&GlobalMid_Lock);
1274 get_random_bytes(&cifs_lock_secret, sizeof(cifs_lock_secret));
1276 if (cifs_max_pending < 2) {
1277 cifs_max_pending = 2;
1278 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1279 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1280 cifs_max_pending = CIFS_MAX_REQ;
1281 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1285 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1288 goto out_clean_proc;
1291 cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1292 WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1293 if (!cifsoplockd_wq) {
1295 goto out_destroy_cifsiod_wq;
1298 rc = cifs_fscache_register();
1300 goto out_destroy_cifsoplockd_wq;
1302 rc = cifs_init_inodecache();
1304 goto out_unreg_fscache;
1306 rc = cifs_init_mids();
1308 goto out_destroy_inodecache;
1310 rc = cifs_init_request_bufs();
1312 goto out_destroy_mids;
1314 #ifdef CONFIG_CIFS_UPCALL
1315 rc = init_cifs_spnego();
1317 goto out_destroy_request_bufs;
1318 #endif /* CONFIG_CIFS_UPCALL */
1320 #ifdef CONFIG_CIFS_ACL
1321 rc = init_cifs_idmap();
1323 goto out_register_key_type;
1324 #endif /* CONFIG_CIFS_ACL */
1326 rc = register_filesystem(&cifs_fs_type);
1328 goto out_init_cifs_idmap;
1332 out_init_cifs_idmap:
1333 #ifdef CONFIG_CIFS_ACL
1335 out_register_key_type:
1337 #ifdef CONFIG_CIFS_UPCALL
1339 out_destroy_request_bufs:
1341 cifs_destroy_request_bufs();
1343 cifs_destroy_mids();
1344 out_destroy_inodecache:
1345 cifs_destroy_inodecache();
1347 cifs_fscache_unregister();
1348 out_destroy_cifsoplockd_wq:
1349 destroy_workqueue(cifsoplockd_wq);
1350 out_destroy_cifsiod_wq:
1351 destroy_workqueue(cifsiod_wq);
1360 cifs_dbg(NOISY, "exit_cifs\n");
1361 unregister_filesystem(&cifs_fs_type);
1362 cifs_dfs_release_automount_timer();
1363 #ifdef CONFIG_CIFS_ACL
1366 #ifdef CONFIG_CIFS_UPCALL
1369 cifs_destroy_request_bufs();
1370 cifs_destroy_mids();
1371 cifs_destroy_inodecache();
1372 cifs_fscache_unregister();
1373 destroy_workqueue(cifsoplockd_wq);
1374 destroy_workqueue(cifsiod_wq);
1378 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1379 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1381 ("VFS to access servers complying with the SNIA CIFS Specification "
1382 "e.g. Samba and Windows");
1383 MODULE_VERSION(CIFS_VERSION);
1384 module_init(init_cifs)
1385 module_exit(exit_cifs)