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>
40 #include <linux/uuid.h>
41 #include <linux/xattr.h>
45 #define DECLARE_GLOBALS_HERE
47 #include "cifsproto.h"
48 #include "cifs_debug.h"
49 #include "cifs_fs_sb.h"
51 #include <linux/key-type.h>
52 #include "cifs_spnego.h"
54 #ifdef CONFIG_CIFS_SMB2
60 bool enable_oplocks = true;
61 bool linuxExtEnabled = true;
62 bool lookupCacheEnabled = true;
63 unsigned int global_secflags = CIFSSEC_DEF;
64 /* unsigned int ntlmv2_support = 0; */
65 unsigned int sign_CIFS_PDUs = 1;
66 static const struct super_operations cifs_super_ops;
67 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
68 module_param(CIFSMaxBufSize, uint, 0444);
69 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
70 "Default: 16384 Range: 8192 to 130048");
71 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
72 module_param(cifs_min_rcv, uint, 0444);
73 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
75 unsigned int cifs_min_small = 30;
76 module_param(cifs_min_small, uint, 0444);
77 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
79 unsigned int cifs_max_pending = CIFS_MAX_REQ;
80 module_param(cifs_max_pending, uint, 0444);
81 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
82 "Default: 32767 Range: 2 to 32767.");
83 module_param(enable_oplocks, bool, 0644);
84 MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1");
86 extern mempool_t *cifs_sm_req_poolp;
87 extern mempool_t *cifs_req_poolp;
88 extern mempool_t *cifs_mid_poolp;
90 struct workqueue_struct *cifsiod_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), 0);
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);
750 cifs_cleanup_volume_info(volume_info);
754 kfree(cifs_sb->prepath);
755 kfree(cifs_sb->mountdata);
758 unload_nls(volume_info->local_nls);
763 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
766 struct inode *inode = file_inode(iocb->ki_filp);
768 if (iocb->ki_filp->f_flags & O_DIRECT)
769 return cifs_user_readv(iocb, iter);
771 rc = cifs_revalidate_mapping(inode);
775 return generic_file_read_iter(iocb, iter);
778 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
780 struct inode *inode = file_inode(iocb->ki_filp);
781 struct cifsInodeInfo *cinode = CIFS_I(inode);
785 if (iocb->ki_filp->f_flags & O_DIRECT) {
786 written = cifs_user_writev(iocb, from);
787 if (written > 0 && CIFS_CACHE_READ(cinode)) {
788 cifs_zap_mapping(inode);
790 "Set no oplock for inode=%p after a write operation\n",
797 written = cifs_get_writer(cinode);
801 written = generic_file_write_iter(iocb, from);
803 if (CIFS_CACHE_WRITE(CIFS_I(inode)))
806 rc = filemap_fdatawrite(inode->i_mapping);
808 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
812 cifs_put_writer(cinode);
816 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
819 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
820 * the cached file length
822 if (whence != SEEK_SET && whence != SEEK_CUR) {
824 struct inode *inode = file_inode(file);
827 * We need to be sure that all dirty pages are written and the
828 * server has the newest file length.
830 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
831 inode->i_mapping->nrpages != 0) {
832 rc = filemap_fdatawait(inode->i_mapping);
834 mapping_set_error(inode->i_mapping, rc);
839 * Some applications poll for the file length in this strange
840 * way so we must seek to end on non-oplocked files by
841 * setting the revalidate time to zero.
843 CIFS_I(inode)->time = 0;
845 rc = cifs_revalidate_file_attr(file);
849 return generic_file_llseek(file, offset, whence);
853 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
856 * Note that this is called by vfs setlease with i_lock held to
857 * protect *lease from going away.
859 struct inode *inode = file_inode(file);
860 struct cifsFileInfo *cfile = file->private_data;
862 if (!(S_ISREG(inode->i_mode)))
865 /* Check if file is oplocked if this is request for new lease */
866 if (arg == F_UNLCK ||
867 ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
868 ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
869 return generic_setlease(file, arg, lease, priv);
870 else if (tlink_tcon(cfile->tlink)->local_lease &&
871 !CIFS_CACHE_READ(CIFS_I(inode)))
873 * If the server claims to support oplock on this file, then we
874 * still need to check oplock even if the local_lease mount
875 * option is set, but there are servers which do not support
876 * oplock for which this mount option may be useful if the user
877 * knows that the file won't be changed on the server by anyone
880 return generic_setlease(file, arg, lease, priv);
885 struct file_system_type cifs_fs_type = {
886 .owner = THIS_MODULE,
888 .mount = cifs_do_mount,
889 .kill_sb = cifs_kill_sb,
892 MODULE_ALIAS_FS("cifs");
893 const struct inode_operations cifs_dir_inode_ops = {
894 .create = cifs_create,
895 .atomic_open = cifs_atomic_open,
896 .lookup = cifs_lookup,
897 .getattr = cifs_getattr,
898 .unlink = cifs_unlink,
899 .link = cifs_hardlink,
902 .rename = cifs_rename2,
903 .permission = cifs_permission,
904 .setattr = cifs_setattr,
905 .symlink = cifs_symlink,
907 .listxattr = cifs_listxattr,
910 const struct inode_operations cifs_file_inode_ops = {
911 .setattr = cifs_setattr,
912 .getattr = cifs_getattr,
913 .permission = cifs_permission,
914 .listxattr = cifs_listxattr,
917 const struct inode_operations cifs_symlink_inode_ops = {
918 .get_link = cifs_get_link,
919 .permission = cifs_permission,
920 .listxattr = cifs_listxattr,
923 static int cifs_clone_file_range(struct file *src_file, loff_t off,
924 struct file *dst_file, loff_t destoff, u64 len)
926 struct inode *src_inode = file_inode(src_file);
927 struct inode *target_inode = file_inode(dst_file);
928 struct cifsFileInfo *smb_file_src = src_file->private_data;
929 struct cifsFileInfo *smb_file_target = dst_file->private_data;
930 struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
934 cifs_dbg(FYI, "clone range\n");
938 if (!src_file->private_data || !dst_file->private_data) {
940 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
945 * Note: cifs case is easier than btrfs since server responsible for
946 * checks for proper open modes and file type and if it wants
947 * server could even support copy of range where source = target
949 lock_two_nondirectories(target_inode, src_inode);
952 len = src_inode->i_size - off;
954 cifs_dbg(FYI, "about to flush pages\n");
955 /* should we flush first and last page first */
956 truncate_inode_pages_range(&target_inode->i_data, destoff,
957 PAGE_ALIGN(destoff + len)-1);
959 if (target_tcon->ses->server->ops->duplicate_extents)
960 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
961 smb_file_src, smb_file_target, off, len, destoff);
965 /* force revalidate of size and timestamps of target file now
966 that target is updated on the server */
967 CIFS_I(target_inode)->time = 0;
968 /* although unlocking in the reverse order from locking is not
969 strictly necessary here it is a little cleaner to be consistent */
970 unlock_two_nondirectories(src_inode, target_inode);
976 ssize_t cifs_file_copychunk_range(unsigned int xid,
977 struct file *src_file, loff_t off,
978 struct file *dst_file, loff_t destoff,
979 size_t len, unsigned int flags)
981 struct inode *src_inode = file_inode(src_file);
982 struct inode *target_inode = file_inode(dst_file);
983 struct cifsFileInfo *smb_file_src;
984 struct cifsFileInfo *smb_file_target;
985 struct cifs_tcon *src_tcon;
986 struct cifs_tcon *target_tcon;
989 cifs_dbg(FYI, "copychunk range\n");
991 if (src_inode == target_inode) {
996 if (!src_file->private_data || !dst_file->private_data) {
998 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1003 smb_file_target = dst_file->private_data;
1004 smb_file_src = src_file->private_data;
1005 src_tcon = tlink_tcon(smb_file_src->tlink);
1006 target_tcon = tlink_tcon(smb_file_target->tlink);
1008 if (src_tcon->ses != target_tcon->ses) {
1009 cifs_dbg(VFS, "source and target of copy not on same server\n");
1014 * Note: cifs case is easier than btrfs since server responsible for
1015 * checks for proper open modes and file type and if it wants
1016 * server could even support copy of range where source = target
1018 lock_two_nondirectories(target_inode, src_inode);
1020 cifs_dbg(FYI, "about to flush pages\n");
1021 /* should we flush first and last page first */
1022 truncate_inode_pages(&target_inode->i_data, 0);
1024 if (target_tcon->ses->server->ops->copychunk_range)
1025 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1026 smb_file_src, smb_file_target, off, len, destoff);
1030 /* force revalidate of size and timestamps of target file now
1031 * that target is updated on the server
1033 CIFS_I(target_inode)->time = 0;
1034 /* although unlocking in the reverse order from locking is not
1035 * strictly necessary here it is a little cleaner to be consistent
1037 unlock_two_nondirectories(src_inode, target_inode);
1043 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1044 struct file *dst_file, loff_t destoff,
1045 size_t len, unsigned int flags)
1047 unsigned int xid = get_xid();
1050 rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1056 const struct file_operations cifs_file_ops = {
1057 .read_iter = cifs_loose_read_iter,
1058 .write_iter = cifs_file_write_iter,
1060 .release = cifs_close,
1062 .fsync = cifs_fsync,
1063 .flush = cifs_flush,
1064 .mmap = cifs_file_mmap,
1065 .splice_read = generic_file_splice_read,
1066 .llseek = cifs_llseek,
1067 .unlocked_ioctl = cifs_ioctl,
1068 .copy_file_range = cifs_copy_file_range,
1069 .clone_file_range = cifs_clone_file_range,
1070 .setlease = cifs_setlease,
1071 .fallocate = cifs_fallocate,
1074 const struct file_operations cifs_file_strict_ops = {
1075 .read_iter = cifs_strict_readv,
1076 .write_iter = cifs_strict_writev,
1078 .release = cifs_close,
1080 .fsync = cifs_strict_fsync,
1081 .flush = cifs_flush,
1082 .mmap = cifs_file_strict_mmap,
1083 .splice_read = generic_file_splice_read,
1084 .llseek = cifs_llseek,
1085 .unlocked_ioctl = cifs_ioctl,
1086 .copy_file_range = cifs_copy_file_range,
1087 .clone_file_range = cifs_clone_file_range,
1088 .setlease = cifs_setlease,
1089 .fallocate = cifs_fallocate,
1092 const struct file_operations cifs_file_direct_ops = {
1093 /* BB reevaluate whether they can be done with directio, no cache */
1094 .read_iter = cifs_user_readv,
1095 .write_iter = cifs_user_writev,
1097 .release = cifs_close,
1099 .fsync = cifs_fsync,
1100 .flush = cifs_flush,
1101 .mmap = cifs_file_mmap,
1102 .splice_read = generic_file_splice_read,
1103 .unlocked_ioctl = cifs_ioctl,
1104 .copy_file_range = cifs_copy_file_range,
1105 .clone_file_range = cifs_clone_file_range,
1106 .llseek = cifs_llseek,
1107 .setlease = cifs_setlease,
1108 .fallocate = cifs_fallocate,
1111 const struct file_operations cifs_file_nobrl_ops = {
1112 .read_iter = cifs_loose_read_iter,
1113 .write_iter = cifs_file_write_iter,
1115 .release = cifs_close,
1116 .fsync = cifs_fsync,
1117 .flush = cifs_flush,
1118 .mmap = cifs_file_mmap,
1119 .splice_read = generic_file_splice_read,
1120 .llseek = cifs_llseek,
1121 .unlocked_ioctl = cifs_ioctl,
1122 .copy_file_range = cifs_copy_file_range,
1123 .clone_file_range = cifs_clone_file_range,
1124 .setlease = cifs_setlease,
1125 .fallocate = cifs_fallocate,
1128 const struct file_operations cifs_file_strict_nobrl_ops = {
1129 .read_iter = cifs_strict_readv,
1130 .write_iter = cifs_strict_writev,
1132 .release = cifs_close,
1133 .fsync = cifs_strict_fsync,
1134 .flush = cifs_flush,
1135 .mmap = cifs_file_strict_mmap,
1136 .splice_read = generic_file_splice_read,
1137 .llseek = cifs_llseek,
1138 .unlocked_ioctl = cifs_ioctl,
1139 .copy_file_range = cifs_copy_file_range,
1140 .clone_file_range = cifs_clone_file_range,
1141 .setlease = cifs_setlease,
1142 .fallocate = cifs_fallocate,
1145 const struct file_operations cifs_file_direct_nobrl_ops = {
1146 /* BB reevaluate whether they can be done with directio, no cache */
1147 .read_iter = cifs_user_readv,
1148 .write_iter = cifs_user_writev,
1150 .release = cifs_close,
1151 .fsync = cifs_fsync,
1152 .flush = cifs_flush,
1153 .mmap = cifs_file_mmap,
1154 .splice_read = generic_file_splice_read,
1155 .unlocked_ioctl = cifs_ioctl,
1156 .copy_file_range = cifs_copy_file_range,
1157 .clone_file_range = cifs_clone_file_range,
1158 .llseek = cifs_llseek,
1159 .setlease = cifs_setlease,
1160 .fallocate = cifs_fallocate,
1163 const struct file_operations cifs_dir_ops = {
1164 .iterate_shared = cifs_readdir,
1165 .release = cifs_closedir,
1166 .read = generic_read_dir,
1167 .unlocked_ioctl = cifs_ioctl,
1168 .copy_file_range = cifs_copy_file_range,
1169 .clone_file_range = cifs_clone_file_range,
1170 .llseek = generic_file_llseek,
1174 cifs_init_once(void *inode)
1176 struct cifsInodeInfo *cifsi = inode;
1178 inode_init_once(&cifsi->vfs_inode);
1179 init_rwsem(&cifsi->lock_sem);
1183 cifs_init_inodecache(void)
1185 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1186 sizeof(struct cifsInodeInfo),
1187 0, (SLAB_RECLAIM_ACCOUNT|
1188 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1190 if (cifs_inode_cachep == NULL)
1197 cifs_destroy_inodecache(void)
1200 * Make sure all delayed rcu free inodes are flushed before we
1204 kmem_cache_destroy(cifs_inode_cachep);
1208 cifs_init_request_bufs(void)
1210 size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
1211 #ifdef CONFIG_CIFS_SMB2
1213 * SMB2 maximum header size is bigger than CIFS one - no problems to
1214 * allocate some more bytes for CIFS.
1216 max_hdr_size = MAX_SMB2_HDR_SIZE;
1218 if (CIFSMaxBufSize < 8192) {
1219 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1220 Unicode path name has to fit in any SMB/CIFS path based frames */
1221 CIFSMaxBufSize = 8192;
1222 } else if (CIFSMaxBufSize > 1024*127) {
1223 CIFSMaxBufSize = 1024 * 127;
1225 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1228 cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1229 CIFSMaxBufSize, CIFSMaxBufSize);
1231 cifs_req_cachep = kmem_cache_create("cifs_request",
1232 CIFSMaxBufSize + max_hdr_size, 0,
1233 SLAB_HWCACHE_ALIGN, NULL);
1234 if (cifs_req_cachep == NULL)
1237 if (cifs_min_rcv < 1)
1239 else if (cifs_min_rcv > 64) {
1241 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1244 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1247 if (cifs_req_poolp == NULL) {
1248 kmem_cache_destroy(cifs_req_cachep);
1251 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1252 almost all handle based requests (but not write response, nor is it
1253 sufficient for path based requests). A smaller size would have
1254 been more efficient (compacting multiple slab items on one 4k page)
1255 for the case in which debug was on, but this larger size allows
1256 more SMBs to use small buffer alloc and is still much more
1257 efficient to alloc 1 per page off the slab compared to 17K (5page)
1258 alloc of large cifs buffers even when page debugging is on */
1259 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1260 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1262 if (cifs_sm_req_cachep == NULL) {
1263 mempool_destroy(cifs_req_poolp);
1264 kmem_cache_destroy(cifs_req_cachep);
1268 if (cifs_min_small < 2)
1270 else if (cifs_min_small > 256) {
1271 cifs_min_small = 256;
1272 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1275 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1276 cifs_sm_req_cachep);
1278 if (cifs_sm_req_poolp == NULL) {
1279 mempool_destroy(cifs_req_poolp);
1280 kmem_cache_destroy(cifs_req_cachep);
1281 kmem_cache_destroy(cifs_sm_req_cachep);
1289 cifs_destroy_request_bufs(void)
1291 mempool_destroy(cifs_req_poolp);
1292 kmem_cache_destroy(cifs_req_cachep);
1293 mempool_destroy(cifs_sm_req_poolp);
1294 kmem_cache_destroy(cifs_sm_req_cachep);
1298 cifs_init_mids(void)
1300 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1301 sizeof(struct mid_q_entry), 0,
1302 SLAB_HWCACHE_ALIGN, NULL);
1303 if (cifs_mid_cachep == NULL)
1306 /* 3 is a reasonable minimum number of simultaneous operations */
1307 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1308 if (cifs_mid_poolp == NULL) {
1309 kmem_cache_destroy(cifs_mid_cachep);
1317 cifs_destroy_mids(void)
1319 mempool_destroy(cifs_mid_poolp);
1320 kmem_cache_destroy(cifs_mid_cachep);
1328 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1329 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1330 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1331 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1332 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1334 * Initialize Global counters
1336 atomic_set(&sesInfoAllocCount, 0);
1337 atomic_set(&tconInfoAllocCount, 0);
1338 atomic_set(&tcpSesAllocCount, 0);
1339 atomic_set(&tcpSesReconnectCount, 0);
1340 atomic_set(&tconInfoReconnectCount, 0);
1342 atomic_set(&bufAllocCount, 0);
1343 atomic_set(&smBufAllocCount, 0);
1344 #ifdef CONFIG_CIFS_STATS2
1345 atomic_set(&totBufAllocCount, 0);
1346 atomic_set(&totSmBufAllocCount, 0);
1347 #endif /* CONFIG_CIFS_STATS2 */
1349 atomic_set(&midCount, 0);
1350 GlobalCurrentXid = 0;
1351 GlobalTotalActiveXid = 0;
1352 GlobalMaxActiveXid = 0;
1353 spin_lock_init(&cifs_tcp_ses_lock);
1354 spin_lock_init(&GlobalMid_Lock);
1356 get_random_bytes(&cifs_lock_secret, sizeof(cifs_lock_secret));
1358 if (cifs_max_pending < 2) {
1359 cifs_max_pending = 2;
1360 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1361 } else if (cifs_max_pending > CIFS_MAX_REQ) {
1362 cifs_max_pending = CIFS_MAX_REQ;
1363 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1367 cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1370 goto out_clean_proc;
1373 rc = cifs_fscache_register();
1375 goto out_destroy_wq;
1377 rc = cifs_init_inodecache();
1379 goto out_unreg_fscache;
1381 rc = cifs_init_mids();
1383 goto out_destroy_inodecache;
1385 rc = cifs_init_request_bufs();
1387 goto out_destroy_mids;
1389 #ifdef CONFIG_CIFS_UPCALL
1390 rc = init_cifs_spnego();
1392 goto out_destroy_request_bufs;
1393 #endif /* CONFIG_CIFS_UPCALL */
1395 #ifdef CONFIG_CIFS_ACL
1396 rc = init_cifs_idmap();
1398 goto out_register_key_type;
1399 #endif /* CONFIG_CIFS_ACL */
1401 rc = register_filesystem(&cifs_fs_type);
1403 goto out_init_cifs_idmap;
1407 out_init_cifs_idmap:
1408 #ifdef CONFIG_CIFS_ACL
1410 out_register_key_type:
1412 #ifdef CONFIG_CIFS_UPCALL
1414 out_destroy_request_bufs:
1416 cifs_destroy_request_bufs();
1418 cifs_destroy_mids();
1419 out_destroy_inodecache:
1420 cifs_destroy_inodecache();
1422 cifs_fscache_unregister();
1424 destroy_workqueue(cifsiod_wq);
1433 cifs_dbg(NOISY, "exit_cifs\n");
1434 unregister_filesystem(&cifs_fs_type);
1435 cifs_dfs_release_automount_timer();
1436 #ifdef CONFIG_CIFS_ACL
1439 #ifdef CONFIG_CIFS_UPCALL
1440 unregister_key_type(&cifs_spnego_key_type);
1442 cifs_destroy_request_bufs();
1443 cifs_destroy_mids();
1444 cifs_destroy_inodecache();
1445 cifs_fscache_unregister();
1446 destroy_workqueue(cifsiod_wq);
1451 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1453 ("VFS to access servers complying with the SNIA CIFS Specification "
1454 "e.g. Samba and Windows");
1455 MODULE_VERSION(CIFS_VERSION);
1456 MODULE_SOFTDEP("pre: arc4");
1457 MODULE_SOFTDEP("pre: des");
1458 MODULE_SOFTDEP("pre: ecb");
1459 MODULE_SOFTDEP("pre: hmac");
1460 MODULE_SOFTDEP("pre: md4");
1461 MODULE_SOFTDEP("pre: md5");
1462 MODULE_SOFTDEP("pre: nls");
1463 #ifdef CONFIG_CIFS_SMB2
1464 MODULE_SOFTDEP("pre: aes");
1465 MODULE_SOFTDEP("pre: cmac");
1466 MODULE_SOFTDEP("pre: sha256");
1467 MODULE_SOFTDEP("pre: aead2");
1468 MODULE_SOFTDEP("pre: ccm");
1469 #endif /* CONFIG_CIFS_SMB2 */
1470 module_init(init_cifs)
1471 module_exit(exit_cifs)