4 * vfs operations that deal with files
6 * Copyright (C) International Business Machines Corp., 2002,2010
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 * Jeremy Allison (jra@samba.org)
10 * This library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published
12 * by the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/backing-dev.h>
26 #include <linux/stat.h>
27 #include <linux/fcntl.h>
28 #include <linux/pagemap.h>
29 #include <linux/pagevec.h>
30 #include <linux/writeback.h>
31 #include <linux/task_io_accounting_ops.h>
32 #include <linux/delay.h>
33 #include <linux/mount.h>
34 #include <linux/slab.h>
35 #include <linux/swap.h>
36 #include <asm/div64.h>
40 #include "cifsproto.h"
41 #include "cifs_unicode.h"
42 #include "cifs_debug.h"
43 #include "cifs_fs_sb.h"
46 static inline int cifs_convert_flags(unsigned int flags)
48 if ((flags & O_ACCMODE) == O_RDONLY)
50 else if ((flags & O_ACCMODE) == O_WRONLY)
52 else if ((flags & O_ACCMODE) == O_RDWR) {
53 /* GENERIC_ALL is too much permission to request
54 can cause unnecessary access denied on create */
55 /* return GENERIC_ALL; */
56 return (GENERIC_READ | GENERIC_WRITE);
59 return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
60 FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
64 static u32 cifs_posix_convert_flags(unsigned int flags)
68 if ((flags & O_ACCMODE) == O_RDONLY)
69 posix_flags = SMB_O_RDONLY;
70 else if ((flags & O_ACCMODE) == O_WRONLY)
71 posix_flags = SMB_O_WRONLY;
72 else if ((flags & O_ACCMODE) == O_RDWR)
73 posix_flags = SMB_O_RDWR;
76 posix_flags |= SMB_O_CREAT;
78 posix_flags |= SMB_O_EXCL;
80 posix_flags |= SMB_O_TRUNC;
81 /* be safe and imply O_SYNC for O_DSYNC */
83 posix_flags |= SMB_O_SYNC;
84 if (flags & O_DIRECTORY)
85 posix_flags |= SMB_O_DIRECTORY;
86 if (flags & O_NOFOLLOW)
87 posix_flags |= SMB_O_NOFOLLOW;
89 posix_flags |= SMB_O_DIRECT;
94 static inline int cifs_get_disposition(unsigned int flags)
96 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
98 else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
99 return FILE_OVERWRITE_IF;
100 else if ((flags & O_CREAT) == O_CREAT)
102 else if ((flags & O_TRUNC) == O_TRUNC)
103 return FILE_OVERWRITE;
108 int cifs_posix_open(char *full_path, struct inode **pinode,
109 struct super_block *sb, int mode, unsigned int f_flags,
110 __u32 *poplock, __u16 *pnetfid, unsigned int xid)
113 FILE_UNIX_BASIC_INFO *presp_data;
114 __u32 posix_flags = 0;
115 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
116 struct cifs_fattr fattr;
117 struct tcon_link *tlink;
118 struct cifs_tcon *tcon;
120 cFYI(1, "posix open %s", full_path);
122 presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
123 if (presp_data == NULL)
126 tlink = cifs_sb_tlink(cifs_sb);
132 tcon = tlink_tcon(tlink);
133 mode &= ~current_umask();
135 posix_flags = cifs_posix_convert_flags(f_flags);
136 rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
137 poplock, full_path, cifs_sb->local_nls,
138 cifs_sb->mnt_cifs_flags &
139 CIFS_MOUNT_MAP_SPECIAL_CHR);
140 cifs_put_tlink(tlink);
145 if (presp_data->Type == cpu_to_le32(-1))
146 goto posix_open_ret; /* open ok, caller does qpathinfo */
149 goto posix_open_ret; /* caller does not need info */
151 cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
153 /* get new inode and set it up */
154 if (*pinode == NULL) {
155 cifs_fill_uniqueid(sb, &fattr);
156 *pinode = cifs_iget(sb, &fattr);
162 cifs_fattr_to_inode(*pinode, &fattr);
171 cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
172 struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock,
173 struct cifs_fid *fid, unsigned int xid)
178 int create_options = CREATE_NOT_DIR;
181 if (!tcon->ses->server->ops->open)
184 desired_access = cifs_convert_flags(f_flags);
186 /*********************************************************************
187 * open flag mapping table:
189 * POSIX Flag CIFS Disposition
190 * ---------- ----------------
191 * O_CREAT FILE_OPEN_IF
192 * O_CREAT | O_EXCL FILE_CREATE
193 * O_CREAT | O_TRUNC FILE_OVERWRITE_IF
194 * O_TRUNC FILE_OVERWRITE
195 * none of the above FILE_OPEN
197 * Note that there is not a direct match between disposition
198 * FILE_SUPERSEDE (ie create whether or not file exists although
199 * O_CREAT | O_TRUNC is similar but truncates the existing
200 * file rather than creating a new file as FILE_SUPERSEDE does
201 * (which uses the attributes / metadata passed in on open call)
203 *? O_SYNC is a reasonable match to CIFS writethrough flag
204 *? and the read write flags match reasonably. O_LARGEFILE
205 *? is irrelevant because largefile support is always used
206 *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
207 * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
208 *********************************************************************/
210 disposition = cifs_get_disposition(f_flags);
212 /* BB pass O_SYNC flag through on file attributes .. BB */
214 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
218 if (backup_cred(cifs_sb))
219 create_options |= CREATE_OPEN_BACKUP_INTENT;
221 rc = tcon->ses->server->ops->open(xid, tcon, full_path, disposition,
222 desired_access, create_options, fid,
223 oplock, buf, cifs_sb);
229 rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
232 rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
240 struct cifsFileInfo *
241 cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
242 struct tcon_link *tlink, __u32 oplock)
244 struct dentry *dentry = file->f_path.dentry;
245 struct inode *inode = dentry->d_inode;
246 struct cifsInodeInfo *cinode = CIFS_I(inode);
247 struct cifsFileInfo *cfile;
249 cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
254 cfile->pid = current->tgid;
255 cfile->uid = current_fsuid();
256 cfile->dentry = dget(dentry);
257 cfile->f_flags = file->f_flags;
258 cfile->invalidHandle = false;
259 cfile->tlink = cifs_get_tlink(tlink);
260 mutex_init(&cfile->fh_mutex);
261 INIT_WORK(&cfile->oplock_break, cifs_oplock_break);
262 INIT_LIST_HEAD(&cfile->llist);
263 tlink_tcon(tlink)->ses->server->ops->set_fid(cfile, fid, oplock);
265 spin_lock(&cifs_file_list_lock);
266 list_add(&cfile->tlist, &(tlink_tcon(tlink)->openFileList));
267 /* if readable file instance put first in list*/
268 if (file->f_mode & FMODE_READ)
269 list_add(&cfile->flist, &cinode->openFileList);
271 list_add_tail(&cfile->flist, &cinode->openFileList);
272 spin_unlock(&cifs_file_list_lock);
274 file->private_data = cfile;
278 static void cifs_del_lock_waiters(struct cifsLockInfo *lock);
280 struct cifsFileInfo *
281 cifsFileInfo_get(struct cifsFileInfo *cifs_file)
283 spin_lock(&cifs_file_list_lock);
284 cifsFileInfo_get_locked(cifs_file);
285 spin_unlock(&cifs_file_list_lock);
290 * Release a reference on the file private data. This may involve closing
291 * the filehandle out on the server. Must be called without holding
292 * cifs_file_list_lock.
294 void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
296 struct inode *inode = cifs_file->dentry->d_inode;
297 struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink);
298 struct cifsInodeInfo *cifsi = CIFS_I(inode);
299 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
300 struct cifsLockInfo *li, *tmp;
302 spin_lock(&cifs_file_list_lock);
303 if (--cifs_file->count > 0) {
304 spin_unlock(&cifs_file_list_lock);
308 /* remove it from the lists */
309 list_del(&cifs_file->flist);
310 list_del(&cifs_file->tlist);
312 if (list_empty(&cifsi->openFileList)) {
313 cFYI(1, "closing last open instance for inode %p",
314 cifs_file->dentry->d_inode);
316 * In strict cache mode we need invalidate mapping on the last
317 * close because it may cause a error when we open this file
318 * again and get at least level II oplock.
320 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
321 CIFS_I(inode)->invalid_mapping = true;
322 cifs_set_oplock_level(cifsi, 0);
324 spin_unlock(&cifs_file_list_lock);
326 cancel_work_sync(&cifs_file->oplock_break);
328 if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
329 struct TCP_Server_Info *server = tcon->ses->server;
334 if (server->ops->close)
335 rc = server->ops->close(xid, tcon, &cifs_file->fid);
339 /* Delete any outstanding lock records. We'll lose them when the file
342 mutex_lock(&cifsi->lock_mutex);
343 list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) {
344 list_del(&li->llist);
345 cifs_del_lock_waiters(li);
348 mutex_unlock(&cifsi->lock_mutex);
350 cifs_put_tlink(cifs_file->tlink);
351 dput(cifs_file->dentry);
355 int cifs_open(struct inode *inode, struct file *file)
360 struct cifs_sb_info *cifs_sb;
361 struct cifs_tcon *tcon;
362 struct tcon_link *tlink;
363 struct cifsFileInfo *cfile = NULL;
364 char *full_path = NULL;
365 bool posix_open_ok = false;
370 cifs_sb = CIFS_SB(inode->i_sb);
371 tlink = cifs_sb_tlink(cifs_sb);
374 return PTR_ERR(tlink);
376 tcon = tlink_tcon(tlink);
378 full_path = build_path_from_dentry(file->f_path.dentry);
379 if (full_path == NULL) {
384 cFYI(1, "inode = 0x%p file flags are 0x%x for %s",
385 inode, file->f_flags, full_path);
387 if (tcon->ses->server->oplocks)
392 if (!tcon->broken_posix_open && tcon->unix_ext &&
393 cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
394 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
395 /* can not refresh inode info since size could be stale */
396 rc = cifs_posix_open(full_path, &inode, inode->i_sb,
397 cifs_sb->mnt_file_mode /* ignored */,
398 file->f_flags, &oplock, &fid.netfid, xid);
400 cFYI(1, "posix open succeeded");
401 posix_open_ok = true;
402 } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
403 if (tcon->ses->serverNOS)
404 cERROR(1, "server %s of type %s returned"
405 " unexpected error on SMB posix open"
406 ", disabling posix open support."
407 " Check if server update available.",
408 tcon->ses->serverName,
409 tcon->ses->serverNOS);
410 tcon->broken_posix_open = true;
411 } else if ((rc != -EIO) && (rc != -EREMOTE) &&
412 (rc != -EOPNOTSUPP)) /* path not found or net err */
415 * Else fallthrough to retry open the old way on network i/o
420 if (!posix_open_ok) {
421 rc = cifs_nt_open(full_path, inode, cifs_sb, tcon,
422 file->f_flags, &oplock, &fid, xid);
427 cfile = cifs_new_fileinfo(&fid, file, tlink, oplock);
429 if (tcon->ses->server->ops->close)
430 tcon->ses->server->ops->close(xid, tcon, &fid);
435 cifs_fscache_set_inode_cookie(inode, file);
437 if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
439 * Time to set mode which we can not set earlier due to
440 * problems creating new read-only files.
442 struct cifs_unix_set_info_args args = {
443 .mode = inode->i_mode,
446 .ctime = NO_CHANGE_64,
447 .atime = NO_CHANGE_64,
448 .mtime = NO_CHANGE_64,
451 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid,
458 cifs_put_tlink(tlink);
463 * Try to reacquire byte range locks that were released when session
466 static int cifs_relock_file(struct cifsFileInfo *cifsFile)
470 /* BB list all locks open on this file and relock */
476 cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
481 struct cifs_sb_info *cifs_sb;
482 struct cifs_tcon *tcon;
483 struct TCP_Server_Info *server;
484 struct cifsInodeInfo *cinode;
486 char *full_path = NULL;
488 int disposition = FILE_OPEN;
489 int create_options = CREATE_NOT_DIR;
493 mutex_lock(&cfile->fh_mutex);
494 if (!cfile->invalidHandle) {
495 mutex_unlock(&cfile->fh_mutex);
501 inode = cfile->dentry->d_inode;
502 cifs_sb = CIFS_SB(inode->i_sb);
503 tcon = tlink_tcon(cfile->tlink);
504 server = tcon->ses->server;
507 * Can not grab rename sem here because various ops, including those
508 * that already have the rename sem can end up causing writepage to get
509 * called and if the server was down that means we end up here, and we
510 * can never tell if the caller already has the rename_sem.
512 full_path = build_path_from_dentry(cfile->dentry);
513 if (full_path == NULL) {
515 mutex_unlock(&cfile->fh_mutex);
520 cFYI(1, "inode = 0x%p file flags 0x%x for %s", inode, cfile->f_flags,
523 if (tcon->ses->server->oplocks)
528 if (tcon->unix_ext && cap_unix(tcon->ses) &&
529 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
530 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
532 * O_CREAT, O_EXCL and O_TRUNC already had their effect on the
533 * original open. Must mask them off for a reopen.
535 unsigned int oflags = cfile->f_flags &
536 ~(O_CREAT | O_EXCL | O_TRUNC);
538 rc = cifs_posix_open(full_path, NULL, inode->i_sb,
539 cifs_sb->mnt_file_mode /* ignored */,
540 oflags, &oplock, &fid.netfid, xid);
542 cFYI(1, "posix reopen succeeded");
546 * fallthrough to retry open the old way on errors, especially
547 * in the reconnect path it is important to retry hard
551 desired_access = cifs_convert_flags(cfile->f_flags);
553 if (backup_cred(cifs_sb))
554 create_options |= CREATE_OPEN_BACKUP_INTENT;
557 * Can not refresh inode by passing in file_info buf to be returned by
558 * CIFSSMBOpen and then calling get_inode_info with returned buf since
559 * file might have write behind data that needs to be flushed and server
560 * version of file size can be stale. If we knew for sure that inode was
561 * not dirty locally we could do this.
563 rc = server->ops->open(xid, tcon, full_path, disposition,
564 desired_access, create_options, &fid, &oplock,
567 mutex_unlock(&cfile->fh_mutex);
568 cFYI(1, "cifs_reopen returned 0x%x", rc);
569 cFYI(1, "oplock: %d", oplock);
570 goto reopen_error_exit;
574 cfile->invalidHandle = false;
575 mutex_unlock(&cfile->fh_mutex);
576 cinode = CIFS_I(inode);
579 rc = filemap_write_and_wait(inode->i_mapping);
580 mapping_set_error(inode->i_mapping, rc);
583 rc = cifs_get_inode_info_unix(&inode, full_path,
586 rc = cifs_get_inode_info(&inode, full_path, NULL,
587 inode->i_sb, xid, NULL);
590 * Else we are writing out data to server already and could deadlock if
591 * we tried to flush data, and since we do not know if we have data that
592 * would invalidate the current end of file on the server we can not go
593 * to the server to get the new inode info.
596 server->ops->set_fid(cfile, &fid, oplock);
597 cifs_relock_file(cfile);
605 int cifs_close(struct inode *inode, struct file *file)
607 if (file->private_data != NULL) {
608 cifsFileInfo_put(file->private_data);
609 file->private_data = NULL;
612 /* return code from the ->release op is always ignored */
616 int cifs_closedir(struct inode *inode, struct file *file)
620 struct cifsFileInfo *cfile = file->private_data;
623 cFYI(1, "Closedir inode = 0x%p", inode);
628 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
630 cFYI(1, "Freeing private data in close dir");
631 spin_lock(&cifs_file_list_lock);
632 if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) {
633 cfile->invalidHandle = true;
634 spin_unlock(&cifs_file_list_lock);
635 rc = CIFSFindClose(xid, tcon, cfile->fid.netfid);
636 cFYI(1, "Closing uncompleted readdir with rc %d", rc);
637 /* not much we can do if it fails anyway, ignore rc */
640 spin_unlock(&cifs_file_list_lock);
641 tmp = cfile->srch_inf.ntwrk_buf_start;
643 cFYI(1, "closedir free smb buf in srch struct");
644 cfile->srch_inf.ntwrk_buf_start = NULL;
645 if (cfile->srch_inf.smallBuf)
646 cifs_small_buf_release(tmp);
648 cifs_buf_release(tmp);
650 cifs_put_tlink(cfile->tlink);
651 kfree(file->private_data);
652 file->private_data = NULL;
654 /* BB can we lock the filestruct while this is going on? */
659 static struct cifsLockInfo *
660 cifs_lock_init(__u64 offset, __u64 length, __u8 type)
662 struct cifsLockInfo *lock =
663 kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
666 lock->offset = offset;
667 lock->length = length;
669 lock->pid = current->tgid;
670 INIT_LIST_HEAD(&lock->blist);
671 init_waitqueue_head(&lock->block_q);
676 cifs_del_lock_waiters(struct cifsLockInfo *lock)
678 struct cifsLockInfo *li, *tmp;
679 list_for_each_entry_safe(li, tmp, &lock->blist, blist) {
680 list_del_init(&li->blist);
681 wake_up(&li->block_q);
686 cifs_find_fid_lock_conflict(struct cifsFileInfo *cfile, __u64 offset,
687 __u64 length, __u8 type, struct cifsFileInfo *cur,
688 struct cifsLockInfo **conf_lock)
690 struct cifsLockInfo *li;
691 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
693 list_for_each_entry(li, &cfile->llist, llist) {
694 if (offset + length <= li->offset ||
695 offset >= li->offset + li->length)
697 else if ((type & server->vals->shared_lock_type) &&
698 ((server->ops->compare_fids(cur, cfile) &&
699 current->tgid == li->pid) || type == li->type))
710 cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
711 __u8 type, struct cifsLockInfo **conf_lock)
714 struct cifsFileInfo *fid, *tmp;
715 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
717 spin_lock(&cifs_file_list_lock);
718 list_for_each_entry_safe(fid, tmp, &cinode->openFileList, flist) {
719 rc = cifs_find_fid_lock_conflict(fid, offset, length, type,
724 spin_unlock(&cifs_file_list_lock);
730 * Check if there is another lock that prevents us to set the lock (mandatory
731 * style). If such a lock exists, update the flock structure with its
732 * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
733 * or leave it the same if we can't. Returns 0 if we don't need to request to
734 * the server or 1 otherwise.
737 cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
738 __u8 type, struct file_lock *flock)
741 struct cifsLockInfo *conf_lock;
742 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
743 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
746 mutex_lock(&cinode->lock_mutex);
748 exist = cifs_find_lock_conflict(cfile, offset, length, type,
751 flock->fl_start = conf_lock->offset;
752 flock->fl_end = conf_lock->offset + conf_lock->length - 1;
753 flock->fl_pid = conf_lock->pid;
754 if (conf_lock->type & server->vals->shared_lock_type)
755 flock->fl_type = F_RDLCK;
757 flock->fl_type = F_WRLCK;
758 } else if (!cinode->can_cache_brlcks)
761 flock->fl_type = F_UNLCK;
763 mutex_unlock(&cinode->lock_mutex);
768 cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock)
770 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
771 mutex_lock(&cinode->lock_mutex);
772 list_add_tail(&lock->llist, &cfile->llist);
773 mutex_unlock(&cinode->lock_mutex);
777 * Set the byte-range lock (mandatory style). Returns:
778 * 1) 0, if we set the lock and don't need to request to the server;
779 * 2) 1, if no locks prevent us but we need to request to the server;
780 * 3) -EACCESS, if there is a lock that prevents us and wait is false.
783 cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock,
786 struct cifsLockInfo *conf_lock;
787 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
793 mutex_lock(&cinode->lock_mutex);
795 exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length,
796 lock->type, &conf_lock);
797 if (!exist && cinode->can_cache_brlcks) {
798 list_add_tail(&lock->llist, &cfile->llist);
799 mutex_unlock(&cinode->lock_mutex);
808 list_add_tail(&lock->blist, &conf_lock->blist);
809 mutex_unlock(&cinode->lock_mutex);
810 rc = wait_event_interruptible(lock->block_q,
811 (lock->blist.prev == &lock->blist) &&
812 (lock->blist.next == &lock->blist));
815 mutex_lock(&cinode->lock_mutex);
816 list_del_init(&lock->blist);
819 mutex_unlock(&cinode->lock_mutex);
824 * Check if there is another lock that prevents us to set the lock (posix
825 * style). If such a lock exists, update the flock structure with its
826 * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
827 * or leave it the same if we can't. Returns 0 if we don't need to request to
828 * the server or 1 otherwise.
831 cifs_posix_lock_test(struct file *file, struct file_lock *flock)
834 struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode);
835 unsigned char saved_type = flock->fl_type;
837 if ((flock->fl_flags & FL_POSIX) == 0)
840 mutex_lock(&cinode->lock_mutex);
841 posix_test_lock(file, flock);
843 if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) {
844 flock->fl_type = saved_type;
848 mutex_unlock(&cinode->lock_mutex);
853 * Set the byte-range lock (posix style). Returns:
854 * 1) 0, if we set the lock and don't need to request to the server;
855 * 2) 1, if we need to request to the server;
856 * 3) <0, if the error occurs while setting the lock.
859 cifs_posix_lock_set(struct file *file, struct file_lock *flock)
861 struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode);
864 if ((flock->fl_flags & FL_POSIX) == 0)
868 mutex_lock(&cinode->lock_mutex);
869 if (!cinode->can_cache_brlcks) {
870 mutex_unlock(&cinode->lock_mutex);
874 rc = posix_lock_file(file, flock, NULL);
875 mutex_unlock(&cinode->lock_mutex);
876 if (rc == FILE_LOCK_DEFERRED) {
877 rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next);
880 locks_delete_block(flock);
886 cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
889 int rc = 0, stored_rc;
890 struct cifsLockInfo *li, *tmp;
891 struct cifs_tcon *tcon;
892 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
893 unsigned int num, max_num, max_buf;
894 LOCKING_ANDX_RANGE *buf, *cur;
895 int types[] = {LOCKING_ANDX_LARGE_FILES,
896 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
900 tcon = tlink_tcon(cfile->tlink);
902 mutex_lock(&cinode->lock_mutex);
903 if (!cinode->can_cache_brlcks) {
904 mutex_unlock(&cinode->lock_mutex);
910 * Accessing maxBuf is racy with cifs_reconnect - need to store value
911 * and check it for zero before using.
913 max_buf = tcon->ses->server->maxBuf;
915 mutex_unlock(&cinode->lock_mutex);
920 max_num = (max_buf - sizeof(struct smb_hdr)) /
921 sizeof(LOCKING_ANDX_RANGE);
922 buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
924 mutex_unlock(&cinode->lock_mutex);
929 for (i = 0; i < 2; i++) {
932 list_for_each_entry_safe(li, tmp, &cfile->llist, llist) {
933 if (li->type != types[i])
935 cur->Pid = cpu_to_le16(li->pid);
936 cur->LengthLow = cpu_to_le32((u32)li->length);
937 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
938 cur->OffsetLow = cpu_to_le32((u32)li->offset);
939 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
940 if (++num == max_num) {
941 stored_rc = cifs_lockv(xid, tcon,
943 (__u8)li->type, 0, num,
954 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
955 (__u8)types[i], 0, num, buf);
961 cinode->can_cache_brlcks = false;
962 mutex_unlock(&cinode->lock_mutex);
969 /* copied from fs/locks.c with a name change */
970 #define cifs_for_each_lock(inode, lockp) \
971 for (lockp = &inode->i_flock; *lockp != NULL; \
972 lockp = &(*lockp)->fl_next)
974 struct lock_to_push {
975 struct list_head llist;
984 cifs_push_posix_locks(struct cifsFileInfo *cfile)
986 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
987 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
988 struct file_lock *flock, **before;
989 unsigned int count = 0, i = 0;
990 int rc = 0, xid, type;
991 struct list_head locks_to_send, *el;
992 struct lock_to_push *lck, *tmp;
997 mutex_lock(&cinode->lock_mutex);
998 if (!cinode->can_cache_brlcks) {
999 mutex_unlock(&cinode->lock_mutex);
1005 cifs_for_each_lock(cfile->dentry->d_inode, before) {
1006 if ((*before)->fl_flags & FL_POSIX)
1011 INIT_LIST_HEAD(&locks_to_send);
1014 * Allocating count locks is enough because no FL_POSIX locks can be
1015 * added to the list while we are holding cinode->lock_mutex that
1016 * protects locking operations of this inode.
1018 for (; i < count; i++) {
1019 lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
1024 list_add_tail(&lck->llist, &locks_to_send);
1027 el = locks_to_send.next;
1029 cifs_for_each_lock(cfile->dentry->d_inode, before) {
1031 if ((flock->fl_flags & FL_POSIX) == 0)
1033 if (el == &locks_to_send) {
1035 * The list ended. We don't have enough allocated
1036 * structures - something is really wrong.
1038 cERROR(1, "Can't push all brlocks!");
1041 length = 1 + flock->fl_end - flock->fl_start;
1042 if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK)
1046 lck = list_entry(el, struct lock_to_push, llist);
1047 lck->pid = flock->fl_pid;
1048 lck->netfid = cfile->fid.netfid;
1049 lck->length = length;
1051 lck->offset = flock->fl_start;
1056 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
1059 stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid,
1060 lck->offset, lck->length, NULL,
1064 list_del(&lck->llist);
1069 cinode->can_cache_brlcks = false;
1070 mutex_unlock(&cinode->lock_mutex);
1075 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
1076 list_del(&lck->llist);
1083 cifs_push_locks(struct cifsFileInfo *cfile)
1085 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
1086 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1088 if (cap_unix(tcon->ses) &&
1089 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
1090 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
1091 return cifs_push_posix_locks(cfile);
1093 return cifs_push_mandatory_locks(cfile);
1097 cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock,
1098 bool *wait_flag, struct TCP_Server_Info *server)
1100 if (flock->fl_flags & FL_POSIX)
1102 if (flock->fl_flags & FL_FLOCK)
1104 if (flock->fl_flags & FL_SLEEP) {
1105 cFYI(1, "Blocking lock");
1108 if (flock->fl_flags & FL_ACCESS)
1109 cFYI(1, "Process suspended by mandatory locking - "
1110 "not implemented yet");
1111 if (flock->fl_flags & FL_LEASE)
1112 cFYI(1, "Lease on file - not implemented yet");
1113 if (flock->fl_flags &
1114 (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
1115 cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags);
1117 *type = server->vals->large_lock_type;
1118 if (flock->fl_type == F_WRLCK) {
1119 cFYI(1, "F_WRLCK ");
1120 *type |= server->vals->exclusive_lock_type;
1122 } else if (flock->fl_type == F_UNLCK) {
1124 *type |= server->vals->unlock_lock_type;
1126 /* Check if unlock includes more than one lock range */
1127 } else if (flock->fl_type == F_RDLCK) {
1129 *type |= server->vals->shared_lock_type;
1131 } else if (flock->fl_type == F_EXLCK) {
1133 *type |= server->vals->exclusive_lock_type;
1135 } else if (flock->fl_type == F_SHLCK) {
1137 *type |= server->vals->shared_lock_type;
1140 cFYI(1, "Unknown type of lock");
1144 cifs_mandatory_lock(unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
1145 __u64 length, __u32 type, int lock, int unlock, bool wait)
1147 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
1148 current->tgid, length, offset, unlock, lock,
1149 (__u8)type, wait, 0);
1153 cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
1154 bool wait_flag, bool posix_lck, unsigned int xid)
1157 __u64 length = 1 + flock->fl_end - flock->fl_start;
1158 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
1159 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1160 struct TCP_Server_Info *server = tcon->ses->server;
1161 __u16 netfid = cfile->fid.netfid;
1164 int posix_lock_type;
1166 rc = cifs_posix_lock_test(file, flock);
1170 if (type & server->vals->shared_lock_type)
1171 posix_lock_type = CIFS_RDLCK;
1173 posix_lock_type = CIFS_WRLCK;
1174 rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid,
1175 flock->fl_start, length, flock,
1176 posix_lock_type, wait_flag);
1180 rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock);
1184 /* BB we could chain these into one lock request BB */
1185 rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, type,
1188 rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length,
1190 flock->fl_type = F_UNLCK;
1192 cERROR(1, "Error unlocking previously locked "
1193 "range %d during test of lock", rc);
1197 if (type & server->vals->shared_lock_type) {
1198 flock->fl_type = F_WRLCK;
1202 rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length,
1203 type | server->vals->shared_lock_type, 1, 0,
1206 rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length,
1207 type | server->vals->shared_lock_type,
1209 flock->fl_type = F_RDLCK;
1211 cERROR(1, "Error unlocking previously locked "
1212 "range %d during test of lock", rc);
1214 flock->fl_type = F_WRLCK;
1220 cifs_move_llist(struct list_head *source, struct list_head *dest)
1222 struct list_head *li, *tmp;
1223 list_for_each_safe(li, tmp, source)
1224 list_move(li, dest);
1228 cifs_free_llist(struct list_head *llist)
1230 struct cifsLockInfo *li, *tmp;
1231 list_for_each_entry_safe(li, tmp, llist, llist) {
1232 cifs_del_lock_waiters(li);
1233 list_del(&li->llist);
1239 cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
1242 int rc = 0, stored_rc;
1243 int types[] = {LOCKING_ANDX_LARGE_FILES,
1244 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
1246 unsigned int max_num, num, max_buf;
1247 LOCKING_ANDX_RANGE *buf, *cur;
1248 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1249 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
1250 struct cifsLockInfo *li, *tmp;
1251 __u64 length = 1 + flock->fl_end - flock->fl_start;
1252 struct list_head tmp_llist;
1254 INIT_LIST_HEAD(&tmp_llist);
1257 * Accessing maxBuf is racy with cifs_reconnect - need to store value
1258 * and check it for zero before using.
1260 max_buf = tcon->ses->server->maxBuf;
1264 max_num = (max_buf - sizeof(struct smb_hdr)) /
1265 sizeof(LOCKING_ANDX_RANGE);
1266 buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
1270 mutex_lock(&cinode->lock_mutex);
1271 for (i = 0; i < 2; i++) {
1274 list_for_each_entry_safe(li, tmp, &cfile->llist, llist) {
1275 if (flock->fl_start > li->offset ||
1276 (flock->fl_start + length) <
1277 (li->offset + li->length))
1279 if (current->tgid != li->pid)
1281 if (types[i] != li->type)
1283 if (cinode->can_cache_brlcks) {
1285 * We can cache brlock requests - simply remove
1286 * a lock from the file's list.
1288 list_del(&li->llist);
1289 cifs_del_lock_waiters(li);
1293 cur->Pid = cpu_to_le16(li->pid);
1294 cur->LengthLow = cpu_to_le32((u32)li->length);
1295 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
1296 cur->OffsetLow = cpu_to_le32((u32)li->offset);
1297 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
1299 * We need to save a lock here to let us add it again to
1300 * the file's list if the unlock range request fails on
1303 list_move(&li->llist, &tmp_llist);
1304 if (++num == max_num) {
1305 stored_rc = cifs_lockv(xid, tcon,
1307 li->type, num, 0, buf);
1310 * We failed on the unlock range
1311 * request - add all locks from the tmp
1312 * list to the head of the file's list.
1314 cifs_move_llist(&tmp_llist,
1319 * The unlock range request succeed -
1320 * free the tmp list.
1322 cifs_free_llist(&tmp_llist);
1329 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
1330 types[i], num, 0, buf);
1332 cifs_move_llist(&tmp_llist, &cfile->llist);
1335 cifs_free_llist(&tmp_llist);
1339 mutex_unlock(&cinode->lock_mutex);
1345 cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
1346 bool wait_flag, bool posix_lck, int lock, int unlock,
1350 __u64 length = 1 + flock->fl_end - flock->fl_start;
1351 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
1352 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1353 struct TCP_Server_Info *server = tcon->ses->server;
1354 __u16 netfid = cfile->fid.netfid;
1357 int posix_lock_type;
1359 rc = cifs_posix_lock_set(file, flock);
1363 if (type & server->vals->shared_lock_type)
1364 posix_lock_type = CIFS_RDLCK;
1366 posix_lock_type = CIFS_WRLCK;
1369 posix_lock_type = CIFS_UNLCK;
1371 rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid,
1372 flock->fl_start, length, NULL,
1373 posix_lock_type, wait_flag);
1378 struct cifsLockInfo *lock;
1380 lock = cifs_lock_init(flock->fl_start, length, type);
1384 rc = cifs_lock_add_if(cfile, lock, wait_flag);
1390 rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length,
1391 type, 1, 0, wait_flag);
1397 cifs_lock_add(cfile, lock);
1399 rc = cifs_unlock_range(cfile, flock, xid);
1402 if (flock->fl_flags & FL_POSIX)
1403 posix_lock_file_wait(file, flock);
1407 int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
1410 int lock = 0, unlock = 0;
1411 bool wait_flag = false;
1412 bool posix_lck = false;
1413 struct cifs_sb_info *cifs_sb;
1414 struct cifs_tcon *tcon;
1415 struct cifsInodeInfo *cinode;
1416 struct cifsFileInfo *cfile;
1423 cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld "
1424 "end: %lld", cmd, flock->fl_flags, flock->fl_type,
1425 flock->fl_start, flock->fl_end);
1427 cfile = (struct cifsFileInfo *)file->private_data;
1428 tcon = tlink_tcon(cfile->tlink);
1430 cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag,
1433 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1434 netfid = cfile->fid.netfid;
1435 cinode = CIFS_I(file->f_path.dentry->d_inode);
1437 if (cap_unix(tcon->ses) &&
1438 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
1439 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
1442 * BB add code here to normalize offset and length to account for
1443 * negative length which we can not accept over the wire.
1445 if (IS_GETLK(cmd)) {
1446 rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid);
1451 if (!lock && !unlock) {
1453 * if no lock or unlock then nothing to do since we do not
1460 rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock,
1467 * update the file size (if needed) after a write. Should be called with
1468 * the inode->i_lock held
1471 cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
1472 unsigned int bytes_written)
1474 loff_t end_of_write = offset + bytes_written;
1476 if (end_of_write > cifsi->server_eof)
1477 cifsi->server_eof = end_of_write;
1480 static ssize_t cifs_write(struct cifsFileInfo *open_file, __u32 pid,
1481 const char *write_data, size_t write_size,
1485 unsigned int bytes_written = 0;
1486 unsigned int total_written;
1487 struct cifs_sb_info *cifs_sb;
1488 struct cifs_tcon *pTcon;
1490 struct dentry *dentry = open_file->dentry;
1491 struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode);
1492 struct cifs_io_parms io_parms;
1494 cifs_sb = CIFS_SB(dentry->d_sb);
1496 cFYI(1, "write %zd bytes to offset %lld of %s", write_size,
1497 *poffset, dentry->d_name.name);
1499 pTcon = tlink_tcon(open_file->tlink);
1503 for (total_written = 0; write_size > total_written;
1504 total_written += bytes_written) {
1506 while (rc == -EAGAIN) {
1510 if (open_file->invalidHandle) {
1511 /* we could deadlock if we called
1512 filemap_fdatawait from here so tell
1513 reopen_file not to flush data to
1515 rc = cifs_reopen_file(open_file, false);
1520 len = min((size_t)cifs_sb->wsize,
1521 write_size - total_written);
1522 /* iov[0] is reserved for smb header */
1523 iov[1].iov_base = (char *)write_data + total_written;
1524 iov[1].iov_len = len;
1525 io_parms.netfid = open_file->fid.netfid;
1527 io_parms.tcon = pTcon;
1528 io_parms.offset = *poffset;
1529 io_parms.length = len;
1530 rc = CIFSSMBWrite2(xid, &io_parms, &bytes_written, iov,
1533 if (rc || (bytes_written == 0)) {
1541 spin_lock(&dentry->d_inode->i_lock);
1542 cifs_update_eof(cifsi, *poffset, bytes_written);
1543 spin_unlock(&dentry->d_inode->i_lock);
1544 *poffset += bytes_written;
1548 cifs_stats_bytes_written(pTcon, total_written);
1550 if (total_written > 0) {
1551 spin_lock(&dentry->d_inode->i_lock);
1552 if (*poffset > dentry->d_inode->i_size)
1553 i_size_write(dentry->d_inode, *poffset);
1554 spin_unlock(&dentry->d_inode->i_lock);
1556 mark_inode_dirty_sync(dentry->d_inode);
1558 return total_written;
1561 struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
1564 struct cifsFileInfo *open_file = NULL;
1565 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1567 /* only filter by fsuid on multiuser mounts */
1568 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1571 spin_lock(&cifs_file_list_lock);
1572 /* we could simply get the first_list_entry since write-only entries
1573 are always at the end of the list but since the first entry might
1574 have a close pending, we go through the whole list */
1575 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1576 if (fsuid_only && open_file->uid != current_fsuid())
1578 if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
1579 if (!open_file->invalidHandle) {
1580 /* found a good file */
1581 /* lock it so it will not be closed on us */
1582 cifsFileInfo_get_locked(open_file);
1583 spin_unlock(&cifs_file_list_lock);
1585 } /* else might as well continue, and look for
1586 another, or simply have the caller reopen it
1587 again rather than trying to fix this handle */
1588 } else /* write only file */
1589 break; /* write only files are last so must be done */
1591 spin_unlock(&cifs_file_list_lock);
1595 struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
1598 struct cifsFileInfo *open_file, *inv_file = NULL;
1599 struct cifs_sb_info *cifs_sb;
1600 bool any_available = false;
1602 unsigned int refind = 0;
1604 /* Having a null inode here (because mapping->host was set to zero by
1605 the VFS or MM) should not happen but we had reports of on oops (due to
1606 it being zero) during stress testcases so we need to check for it */
1608 if (cifs_inode == NULL) {
1609 cERROR(1, "Null inode passed to cifs_writeable_file");
1614 cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1616 /* only filter by fsuid on multiuser mounts */
1617 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1620 spin_lock(&cifs_file_list_lock);
1622 if (refind > MAX_REOPEN_ATT) {
1623 spin_unlock(&cifs_file_list_lock);
1626 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1627 if (!any_available && open_file->pid != current->tgid)
1629 if (fsuid_only && open_file->uid != current_fsuid())
1631 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
1632 if (!open_file->invalidHandle) {
1633 /* found a good writable file */
1634 cifsFileInfo_get_locked(open_file);
1635 spin_unlock(&cifs_file_list_lock);
1639 inv_file = open_file;
1643 /* couldn't find useable FH with same pid, try any available */
1644 if (!any_available) {
1645 any_available = true;
1646 goto refind_writable;
1650 any_available = false;
1651 cifsFileInfo_get_locked(inv_file);
1654 spin_unlock(&cifs_file_list_lock);
1657 rc = cifs_reopen_file(inv_file, false);
1661 spin_lock(&cifs_file_list_lock);
1662 list_move_tail(&inv_file->flist,
1663 &cifs_inode->openFileList);
1664 spin_unlock(&cifs_file_list_lock);
1665 cifsFileInfo_put(inv_file);
1666 spin_lock(&cifs_file_list_lock);
1668 goto refind_writable;
1675 static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
1677 struct address_space *mapping = page->mapping;
1678 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1681 int bytes_written = 0;
1682 struct inode *inode;
1683 struct cifsFileInfo *open_file;
1685 if (!mapping || !mapping->host)
1688 inode = page->mapping->host;
1690 offset += (loff_t)from;
1691 write_data = kmap(page);
1694 if ((to > PAGE_CACHE_SIZE) || (from > to)) {
1699 /* racing with truncate? */
1700 if (offset > mapping->host->i_size) {
1702 return 0; /* don't care */
1705 /* check to make sure that we are not extending the file */
1706 if (mapping->host->i_size - offset < (loff_t)to)
1707 to = (unsigned)(mapping->host->i_size - offset);
1709 open_file = find_writable_file(CIFS_I(mapping->host), false);
1711 bytes_written = cifs_write(open_file, open_file->pid,
1712 write_data, to - from, &offset);
1713 cifsFileInfo_put(open_file);
1714 /* Does mm or vfs already set times? */
1715 inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
1716 if ((bytes_written > 0) && (offset))
1718 else if (bytes_written < 0)
1721 cFYI(1, "No writeable filehandles for inode");
1730 * Marshal up the iov array, reserving the first one for the header. Also,
1734 cifs_writepages_marshal_iov(struct kvec *iov, struct cifs_writedata *wdata)
1737 struct inode *inode = wdata->cfile->dentry->d_inode;
1738 loff_t size = i_size_read(inode);
1740 /* marshal up the pages into iov array */
1742 for (i = 0; i < wdata->nr_pages; i++) {
1743 iov[i + 1].iov_len = min(size - page_offset(wdata->pages[i]),
1744 (loff_t)PAGE_CACHE_SIZE);
1745 iov[i + 1].iov_base = kmap(wdata->pages[i]);
1746 wdata->bytes += iov[i + 1].iov_len;
1750 static int cifs_writepages(struct address_space *mapping,
1751 struct writeback_control *wbc)
1753 struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb);
1754 bool done = false, scanned = false, range_whole = false;
1756 struct cifs_writedata *wdata;
1761 * If wsize is smaller than the page cache size, default to writing
1762 * one page at a time via cifs_writepage
1764 if (cifs_sb->wsize < PAGE_CACHE_SIZE)
1765 return generic_writepages(mapping, wbc);
1767 if (wbc->range_cyclic) {
1768 index = mapping->writeback_index; /* Start from prev offset */
1771 index = wbc->range_start >> PAGE_CACHE_SHIFT;
1772 end = wbc->range_end >> PAGE_CACHE_SHIFT;
1773 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1778 while (!done && index <= end) {
1779 unsigned int i, nr_pages, found_pages;
1780 pgoff_t next = 0, tofind;
1781 struct page **pages;
1783 tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1,
1786 wdata = cifs_writedata_alloc((unsigned int)tofind,
1787 cifs_writev_complete);
1794 * find_get_pages_tag seems to return a max of 256 on each
1795 * iteration, so we must call it several times in order to
1796 * fill the array or the wsize is effectively limited to
1797 * 256 * PAGE_CACHE_SIZE.
1800 pages = wdata->pages;
1802 nr_pages = find_get_pages_tag(mapping, &index,
1803 PAGECACHE_TAG_DIRTY,
1805 found_pages += nr_pages;
1808 } while (nr_pages && tofind && index <= end);
1810 if (found_pages == 0) {
1811 kref_put(&wdata->refcount, cifs_writedata_release);
1816 for (i = 0; i < found_pages; i++) {
1817 page = wdata->pages[i];
1819 * At this point we hold neither mapping->tree_lock nor
1820 * lock on the page itself: the page may be truncated or
1821 * invalidated (changing page->mapping to NULL), or even
1822 * swizzled back from swapper_space to tmpfs file
1828 else if (!trylock_page(page))
1831 if (unlikely(page->mapping != mapping)) {
1836 if (!wbc->range_cyclic && page->index > end) {
1842 if (next && (page->index != next)) {
1843 /* Not next consecutive page */
1848 if (wbc->sync_mode != WB_SYNC_NONE)
1849 wait_on_page_writeback(page);
1851 if (PageWriteback(page) ||
1852 !clear_page_dirty_for_io(page)) {
1858 * This actually clears the dirty bit in the radix tree.
1859 * See cifs_writepage() for more commentary.
1861 set_page_writeback(page);
1863 if (page_offset(page) >= mapping->host->i_size) {
1866 end_page_writeback(page);
1870 wdata->pages[i] = page;
1871 next = page->index + 1;
1875 /* reset index to refind any pages skipped */
1877 index = wdata->pages[0]->index + 1;
1879 /* put any pages we aren't going to use */
1880 for (i = nr_pages; i < found_pages; i++) {
1881 page_cache_release(wdata->pages[i]);
1882 wdata->pages[i] = NULL;
1885 /* nothing to write? */
1886 if (nr_pages == 0) {
1887 kref_put(&wdata->refcount, cifs_writedata_release);
1891 wdata->sync_mode = wbc->sync_mode;
1892 wdata->nr_pages = nr_pages;
1893 wdata->offset = page_offset(wdata->pages[0]);
1894 wdata->marshal_iov = cifs_writepages_marshal_iov;
1897 if (wdata->cfile != NULL)
1898 cifsFileInfo_put(wdata->cfile);
1899 wdata->cfile = find_writable_file(CIFS_I(mapping->host),
1901 if (!wdata->cfile) {
1902 cERROR(1, "No writable handles for inode");
1906 wdata->pid = wdata->cfile->pid;
1907 rc = cifs_async_writev(wdata);
1908 } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN);
1910 for (i = 0; i < nr_pages; ++i)
1911 unlock_page(wdata->pages[i]);
1913 /* send failure -- clean up the mess */
1915 for (i = 0; i < nr_pages; ++i) {
1917 redirty_page_for_writepage(wbc,
1920 SetPageError(wdata->pages[i]);
1921 end_page_writeback(wdata->pages[i]);
1922 page_cache_release(wdata->pages[i]);
1925 mapping_set_error(mapping, rc);
1927 kref_put(&wdata->refcount, cifs_writedata_release);
1929 wbc->nr_to_write -= nr_pages;
1930 if (wbc->nr_to_write <= 0)
1936 if (!scanned && !done) {
1938 * We hit the last page and there is more work to be done: wrap
1939 * back to the start of the file
1946 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1947 mapping->writeback_index = index;
1953 cifs_writepage_locked(struct page *page, struct writeback_control *wbc)
1959 /* BB add check for wbc flags */
1960 page_cache_get(page);
1961 if (!PageUptodate(page))
1962 cFYI(1, "ppw - page not up to date");
1965 * Set the "writeback" flag, and clear "dirty" in the radix tree.
1967 * A writepage() implementation always needs to do either this,
1968 * or re-dirty the page with "redirty_page_for_writepage()" in
1969 * the case of a failure.
1971 * Just unlocking the page will cause the radix tree tag-bits
1972 * to fail to update with the state of the page correctly.
1974 set_page_writeback(page);
1976 rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
1977 if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL)
1979 else if (rc == -EAGAIN)
1980 redirty_page_for_writepage(wbc, page);
1984 SetPageUptodate(page);
1985 end_page_writeback(page);
1986 page_cache_release(page);
1991 static int cifs_writepage(struct page *page, struct writeback_control *wbc)
1993 int rc = cifs_writepage_locked(page, wbc);
1998 static int cifs_write_end(struct file *file, struct address_space *mapping,
1999 loff_t pos, unsigned len, unsigned copied,
2000 struct page *page, void *fsdata)
2003 struct inode *inode = mapping->host;
2004 struct cifsFileInfo *cfile = file->private_data;
2005 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
2008 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2011 pid = current->tgid;
2013 cFYI(1, "write_end for page %p from pos %lld with %d bytes",
2016 if (PageChecked(page)) {
2018 SetPageUptodate(page);
2019 ClearPageChecked(page);
2020 } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
2021 SetPageUptodate(page);
2023 if (!PageUptodate(page)) {
2025 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
2029 /* this is probably better than directly calling
2030 partialpage_write since in this function the file handle is
2031 known which we might as well leverage */
2032 /* BB check if anything else missing out of ppw
2033 such as updating last write time */
2034 page_data = kmap(page);
2035 rc = cifs_write(cfile, pid, page_data + offset, copied, &pos);
2036 /* if (rc < 0) should we set writebehind rc? */
2043 set_page_dirty(page);
2047 spin_lock(&inode->i_lock);
2048 if (pos > inode->i_size)
2049 i_size_write(inode, pos);
2050 spin_unlock(&inode->i_lock);
2054 page_cache_release(page);
2059 int cifs_strict_fsync(struct file *file, loff_t start, loff_t end,
2064 struct cifs_tcon *tcon;
2065 struct TCP_Server_Info *server;
2066 struct cifsFileInfo *smbfile = file->private_data;
2067 struct inode *inode = file->f_path.dentry->d_inode;
2068 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2070 rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
2073 mutex_lock(&inode->i_mutex);
2077 cFYI(1, "Sync file - name: %s datasync: 0x%x",
2078 file->f_path.dentry->d_name.name, datasync);
2080 if (!CIFS_I(inode)->clientCanCacheRead) {
2081 rc = cifs_invalidate_mapping(inode);
2083 cFYI(1, "rc: %d during invalidate phase", rc);
2084 rc = 0; /* don't care about it in fsync */
2088 tcon = tlink_tcon(smbfile->tlink);
2089 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2090 server = tcon->ses->server;
2091 if (server->ops->flush)
2092 rc = server->ops->flush(xid, tcon, &smbfile->fid);
2098 mutex_unlock(&inode->i_mutex);
2102 int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2106 struct cifs_tcon *tcon;
2107 struct TCP_Server_Info *server;
2108 struct cifsFileInfo *smbfile = file->private_data;
2109 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2110 struct inode *inode = file->f_mapping->host;
2112 rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
2115 mutex_lock(&inode->i_mutex);
2119 cFYI(1, "Sync file - name: %s datasync: 0x%x",
2120 file->f_path.dentry->d_name.name, datasync);
2122 tcon = tlink_tcon(smbfile->tlink);
2123 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2124 server = tcon->ses->server;
2125 if (server->ops->flush)
2126 rc = server->ops->flush(xid, tcon, &smbfile->fid);
2132 mutex_unlock(&inode->i_mutex);
2137 * As file closes, flush all cached write data for this inode checking
2138 * for write behind errors.
2140 int cifs_flush(struct file *file, fl_owner_t id)
2142 struct inode *inode = file->f_path.dentry->d_inode;
2145 if (file->f_mode & FMODE_WRITE)
2146 rc = filemap_write_and_wait(inode->i_mapping);
2148 cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc);
2154 cifs_write_allocate_pages(struct page **pages, unsigned long num_pages)
2159 for (i = 0; i < num_pages; i++) {
2160 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2163 * save number of pages we have already allocated and
2164 * return with ENOMEM error
2173 for (i = 0; i < num_pages; i++)
2180 size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len)
2185 clen = min_t(const size_t, len, wsize);
2186 num_pages = DIV_ROUND_UP(clen, PAGE_SIZE);
2195 cifs_uncached_marshal_iov(struct kvec *iov, struct cifs_writedata *wdata)
2198 size_t bytes = wdata->bytes;
2200 /* marshal up the pages into iov array */
2201 for (i = 0; i < wdata->nr_pages; i++) {
2202 iov[i + 1].iov_len = min_t(size_t, bytes, PAGE_SIZE);
2203 iov[i + 1].iov_base = kmap(wdata->pages[i]);
2204 bytes -= iov[i + 1].iov_len;
2209 cifs_uncached_writev_complete(struct work_struct *work)
2212 struct cifs_writedata *wdata = container_of(work,
2213 struct cifs_writedata, work);
2214 struct inode *inode = wdata->cfile->dentry->d_inode;
2215 struct cifsInodeInfo *cifsi = CIFS_I(inode);
2217 spin_lock(&inode->i_lock);
2218 cifs_update_eof(cifsi, wdata->offset, wdata->bytes);
2219 if (cifsi->server_eof > inode->i_size)
2220 i_size_write(inode, cifsi->server_eof);
2221 spin_unlock(&inode->i_lock);
2223 complete(&wdata->done);
2225 if (wdata->result != -EAGAIN) {
2226 for (i = 0; i < wdata->nr_pages; i++)
2227 put_page(wdata->pages[i]);
2230 kref_put(&wdata->refcount, cifs_writedata_release);
2233 /* attempt to send write to server, retry on any -EAGAIN errors */
2235 cifs_uncached_retry_writev(struct cifs_writedata *wdata)
2240 if (wdata->cfile->invalidHandle) {
2241 rc = cifs_reopen_file(wdata->cfile, false);
2245 rc = cifs_async_writev(wdata);
2246 } while (rc == -EAGAIN);
2252 cifs_iovec_write(struct file *file, const struct iovec *iov,
2253 unsigned long nr_segs, loff_t *poffset)
2255 unsigned long nr_pages, i;
2256 size_t copied, len, cur_len;
2257 ssize_t total_written = 0;
2260 struct cifsFileInfo *open_file;
2261 struct cifs_tcon *tcon;
2262 struct cifs_sb_info *cifs_sb;
2263 struct cifs_writedata *wdata, *tmp;
2264 struct list_head wdata_list;
2268 len = iov_length(iov, nr_segs);
2272 rc = generic_write_checks(file, poffset, &len, 0);
2276 INIT_LIST_HEAD(&wdata_list);
2277 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2278 open_file = file->private_data;
2279 tcon = tlink_tcon(open_file->tlink);
2282 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2283 pid = open_file->pid;
2285 pid = current->tgid;
2287 iov_iter_init(&it, iov, nr_segs, len, 0);
2291 nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len);
2292 wdata = cifs_writedata_alloc(nr_pages,
2293 cifs_uncached_writev_complete);
2299 rc = cifs_write_allocate_pages(wdata->pages, nr_pages);
2306 for (i = 0; i < nr_pages; i++) {
2307 copied = min_t(const size_t, cur_len, PAGE_SIZE);
2308 copied = iov_iter_copy_from_user(wdata->pages[i], &it,
2311 iov_iter_advance(&it, copied);
2313 cur_len = save_len - cur_len;
2315 wdata->sync_mode = WB_SYNC_ALL;
2316 wdata->nr_pages = nr_pages;
2317 wdata->offset = (__u64)offset;
2318 wdata->cfile = cifsFileInfo_get(open_file);
2320 wdata->bytes = cur_len;
2321 wdata->marshal_iov = cifs_uncached_marshal_iov;
2322 rc = cifs_uncached_retry_writev(wdata);
2324 kref_put(&wdata->refcount, cifs_writedata_release);
2328 list_add_tail(&wdata->list, &wdata_list);
2334 * If at least one write was successfully sent, then discard any rc
2335 * value from the later writes. If the other write succeeds, then
2336 * we'll end up returning whatever was written. If it fails, then
2337 * we'll get a new rc value from that.
2339 if (!list_empty(&wdata_list))
2343 * Wait for and collect replies for any successful sends in order of
2344 * increasing offset. Once an error is hit or we get a fatal signal
2345 * while waiting, then return without waiting for any more replies.
2348 list_for_each_entry_safe(wdata, tmp, &wdata_list, list) {
2350 /* FIXME: freezable too? */
2351 rc = wait_for_completion_killable(&wdata->done);
2354 else if (wdata->result)
2357 total_written += wdata->bytes;
2359 /* resend call if it's a retryable error */
2360 if (rc == -EAGAIN) {
2361 rc = cifs_uncached_retry_writev(wdata);
2365 list_del_init(&wdata->list);
2366 kref_put(&wdata->refcount, cifs_writedata_release);
2369 if (total_written > 0)
2370 *poffset += total_written;
2372 cifs_stats_bytes_written(tcon, total_written);
2373 return total_written ? total_written : (ssize_t)rc;
2376 ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov,
2377 unsigned long nr_segs, loff_t pos)
2380 struct inode *inode;
2382 inode = iocb->ki_filp->f_path.dentry->d_inode;
2385 * BB - optimize the way when signing is disabled. We can drop this
2386 * extra memory-to-memory copying and use iovec buffers for constructing
2390 written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos);
2392 CIFS_I(inode)->invalid_mapping = true;
2399 ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov,
2400 unsigned long nr_segs, loff_t pos)
2402 struct inode *inode;
2404 inode = iocb->ki_filp->f_path.dentry->d_inode;
2406 if (CIFS_I(inode)->clientCanCacheAll)
2407 return generic_file_aio_write(iocb, iov, nr_segs, pos);
2410 * In strict cache mode we need to write the data to the server exactly
2411 * from the pos to pos+len-1 rather than flush all affected pages
2412 * because it may cause a error with mandatory locks on these pages but
2413 * not on the region from pos to ppos+len-1.
2416 return cifs_user_writev(iocb, iov, nr_segs, pos);
2419 static struct cifs_readdata *
2420 cifs_readdata_alloc(unsigned int nr_vecs, work_func_t complete)
2422 struct cifs_readdata *rdata;
2424 rdata = kzalloc(sizeof(*rdata) +
2425 sizeof(struct kvec) * nr_vecs, GFP_KERNEL);
2426 if (rdata != NULL) {
2427 kref_init(&rdata->refcount);
2428 INIT_LIST_HEAD(&rdata->list);
2429 init_completion(&rdata->done);
2430 INIT_WORK(&rdata->work, complete);
2431 INIT_LIST_HEAD(&rdata->pages);
2437 cifs_readdata_release(struct kref *refcount)
2439 struct cifs_readdata *rdata = container_of(refcount,
2440 struct cifs_readdata, refcount);
2443 cifsFileInfo_put(rdata->cfile);
2449 cifs_read_allocate_pages(struct list_head *list, unsigned int npages)
2452 struct page *page, *tpage;
2455 for (i = 0; i < npages; i++) {
2456 page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2461 list_add(&page->lru, list);
2465 list_for_each_entry_safe(page, tpage, list, lru) {
2466 list_del(&page->lru);
2474 cifs_uncached_readdata_release(struct kref *refcount)
2476 struct page *page, *tpage;
2477 struct cifs_readdata *rdata = container_of(refcount,
2478 struct cifs_readdata, refcount);
2480 list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
2481 list_del(&page->lru);
2484 cifs_readdata_release(refcount);
2488 cifs_retry_async_readv(struct cifs_readdata *rdata)
2493 if (rdata->cfile->invalidHandle) {
2494 rc = cifs_reopen_file(rdata->cfile, true);
2498 rc = cifs_async_readv(rdata);
2499 } while (rc == -EAGAIN);
2505 * cifs_readdata_to_iov - copy data from pages in response to an iovec
2506 * @rdata: the readdata response with list of pages holding data
2507 * @iov: vector in which we should copy the data
2508 * @nr_segs: number of segments in vector
2509 * @offset: offset into file of the first iovec
2510 * @copied: used to return the amount of data copied to the iov
2512 * This function copies data from a list of pages in a readdata response into
2513 * an array of iovecs. It will first calculate where the data should go
2514 * based on the info in the readdata and then copy the data into that spot.
2517 cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov,
2518 unsigned long nr_segs, loff_t offset, ssize_t *copied)
2522 size_t pos = rdata->offset - offset;
2523 struct page *page, *tpage;
2524 ssize_t remaining = rdata->bytes;
2525 unsigned char *pdata;
2527 /* set up iov_iter and advance to the correct offset */
2528 iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0);
2529 iov_iter_advance(&ii, pos);
2532 list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
2535 /* copy a whole page or whatever's left */
2536 copy = min_t(ssize_t, remaining, PAGE_SIZE);
2538 /* ...but limit it to whatever space is left in the iov */
2539 copy = min_t(ssize_t, copy, iov_iter_count(&ii));
2541 /* go while there's data to be copied and no errors */
2544 rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset,
2550 iov_iter_advance(&ii, copy);
2554 list_del(&page->lru);
2562 cifs_uncached_readv_complete(struct work_struct *work)
2564 struct cifs_readdata *rdata = container_of(work,
2565 struct cifs_readdata, work);
2567 /* if the result is non-zero then the pages weren't kmapped */
2568 if (rdata->result == 0) {
2571 list_for_each_entry(page, &rdata->pages, lru)
2575 complete(&rdata->done);
2576 kref_put(&rdata->refcount, cifs_uncached_readdata_release);
2580 cifs_uncached_read_marshal_iov(struct cifs_readdata *rdata,
2581 unsigned int remaining)
2584 struct page *page, *tpage;
2587 list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
2588 if (remaining >= PAGE_SIZE) {
2589 /* enough data to fill the page */
2590 rdata->iov[rdata->nr_iov].iov_base = kmap(page);
2591 rdata->iov[rdata->nr_iov].iov_len = PAGE_SIZE;
2592 cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
2593 rdata->nr_iov, page->index,
2594 rdata->iov[rdata->nr_iov].iov_base,
2595 rdata->iov[rdata->nr_iov].iov_len);
2598 remaining -= PAGE_SIZE;
2599 } else if (remaining > 0) {
2600 /* enough for partial page, fill and zero the rest */
2601 rdata->iov[rdata->nr_iov].iov_base = kmap(page);
2602 rdata->iov[rdata->nr_iov].iov_len = remaining;
2603 cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
2604 rdata->nr_iov, page->index,
2605 rdata->iov[rdata->nr_iov].iov_base,
2606 rdata->iov[rdata->nr_iov].iov_len);
2607 memset(rdata->iov[rdata->nr_iov].iov_base + remaining,
2608 '\0', PAGE_SIZE - remaining);
2613 /* no need to hold page hostage */
2614 list_del(&page->lru);
2623 cifs_iovec_read(struct file *file, const struct iovec *iov,
2624 unsigned long nr_segs, loff_t *poffset)
2627 size_t len, cur_len;
2628 ssize_t total_read = 0;
2629 loff_t offset = *poffset;
2630 unsigned int npages;
2631 struct cifs_sb_info *cifs_sb;
2632 struct cifs_tcon *tcon;
2633 struct cifsFileInfo *open_file;
2634 struct cifs_readdata *rdata, *tmp;
2635 struct list_head rdata_list;
2641 len = iov_length(iov, nr_segs);
2645 INIT_LIST_HEAD(&rdata_list);
2646 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2647 open_file = file->private_data;
2648 tcon = tlink_tcon(open_file->tlink);
2650 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2651 pid = open_file->pid;
2653 pid = current->tgid;
2655 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
2656 cFYI(1, "attempting read on write only file instance");
2659 cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize);
2660 npages = DIV_ROUND_UP(cur_len, PAGE_SIZE);
2662 /* allocate a readdata struct */
2663 rdata = cifs_readdata_alloc(npages,
2664 cifs_uncached_readv_complete);
2670 rc = cifs_read_allocate_pages(&rdata->pages, npages);
2674 rdata->cfile = cifsFileInfo_get(open_file);
2675 rdata->offset = offset;
2676 rdata->bytes = cur_len;
2678 rdata->marshal_iov = cifs_uncached_read_marshal_iov;
2680 rc = cifs_retry_async_readv(rdata);
2683 kref_put(&rdata->refcount,
2684 cifs_uncached_readdata_release);
2688 list_add_tail(&rdata->list, &rdata_list);
2693 /* if at least one read request send succeeded, then reset rc */
2694 if (!list_empty(&rdata_list))
2697 /* the loop below should proceed in the order of increasing offsets */
2699 list_for_each_entry_safe(rdata, tmp, &rdata_list, list) {
2703 /* FIXME: freezable sleep too? */
2704 rc = wait_for_completion_killable(&rdata->done);
2707 else if (rdata->result)
2710 rc = cifs_readdata_to_iov(rdata, iov,
2713 total_read += copied;
2716 /* resend call if it's a retryable error */
2717 if (rc == -EAGAIN) {
2718 rc = cifs_retry_async_readv(rdata);
2722 list_del_init(&rdata->list);
2723 kref_put(&rdata->refcount, cifs_uncached_readdata_release);
2726 cifs_stats_bytes_read(tcon, total_read);
2727 *poffset += total_read;
2729 return total_read ? total_read : rc;
2732 ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov,
2733 unsigned long nr_segs, loff_t pos)
2737 read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos);
2744 ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov,
2745 unsigned long nr_segs, loff_t pos)
2747 struct inode *inode;
2749 inode = iocb->ki_filp->f_path.dentry->d_inode;
2751 if (CIFS_I(inode)->clientCanCacheRead)
2752 return generic_file_aio_read(iocb, iov, nr_segs, pos);
2755 * In strict cache mode we need to read from the server all the time
2756 * if we don't have level II oplock because the server can delay mtime
2757 * change - so we can't make a decision about inode invalidating.
2758 * And we can also fail with pagereading if there are mandatory locks
2759 * on pages affected by this read but not on the region from pos to
2763 return cifs_user_readv(iocb, iov, nr_segs, pos);
2766 static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
2770 unsigned int bytes_read = 0;
2771 unsigned int total_read;
2772 unsigned int current_read_size;
2774 struct cifs_sb_info *cifs_sb;
2775 struct cifs_tcon *tcon;
2777 char *current_offset;
2778 struct cifsFileInfo *open_file;
2779 struct cifs_io_parms io_parms;
2780 int buf_type = CIFS_NO_BUFFER;
2784 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2786 /* FIXME: set up handlers for larger reads and/or convert to async */
2787 rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize);
2789 if (file->private_data == NULL) {
2794 open_file = file->private_data;
2795 tcon = tlink_tcon(open_file->tlink);
2797 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2798 pid = open_file->pid;
2800 pid = current->tgid;
2802 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
2803 cFYI(1, "attempting read on write only file instance");
2805 for (total_read = 0, current_offset = read_data;
2806 read_size > total_read;
2807 total_read += bytes_read, current_offset += bytes_read) {
2808 current_read_size = min_t(uint, read_size - total_read, rsize);
2810 * For windows me and 9x we do not want to request more than it
2811 * negotiated since it will refuse the read then.
2813 if ((tcon->ses) && !(tcon->ses->capabilities &
2814 tcon->ses->server->vals->cap_large_files)) {
2815 current_read_size = min_t(uint, current_read_size,
2819 while (rc == -EAGAIN) {
2820 if (open_file->invalidHandle) {
2821 rc = cifs_reopen_file(open_file, true);
2825 io_parms.netfid = open_file->fid.netfid;
2827 io_parms.tcon = tcon;
2828 io_parms.offset = *poffset;
2829 io_parms.length = current_read_size;
2830 rc = CIFSSMBRead(xid, &io_parms, &bytes_read,
2831 ¤t_offset, &buf_type);
2833 if (rc || (bytes_read == 0)) {
2841 cifs_stats_bytes_read(tcon, total_read);
2842 *poffset += bytes_read;
2850 * If the page is mmap'ed into a process' page tables, then we need to make
2851 * sure that it doesn't change while being written back.
2854 cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
2856 struct page *page = vmf->page;
2859 return VM_FAULT_LOCKED;
2862 static struct vm_operations_struct cifs_file_vm_ops = {
2863 .fault = filemap_fault,
2864 .page_mkwrite = cifs_page_mkwrite,
2867 int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
2870 struct inode *inode = file->f_path.dentry->d_inode;
2874 if (!CIFS_I(inode)->clientCanCacheRead) {
2875 rc = cifs_invalidate_mapping(inode);
2880 rc = generic_file_mmap(file, vma);
2882 vma->vm_ops = &cifs_file_vm_ops;
2887 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
2892 rc = cifs_revalidate_file(file);
2894 cFYI(1, "Validation prior to mmap failed, error=%d", rc);
2898 rc = generic_file_mmap(file, vma);
2900 vma->vm_ops = &cifs_file_vm_ops;
2906 cifs_readv_complete(struct work_struct *work)
2908 struct cifs_readdata *rdata = container_of(work,
2909 struct cifs_readdata, work);
2910 struct page *page, *tpage;
2912 list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
2913 list_del(&page->lru);
2914 lru_cache_add_file(page);
2916 if (rdata->result == 0) {
2918 flush_dcache_page(page);
2919 SetPageUptodate(page);
2924 if (rdata->result == 0)
2925 cifs_readpage_to_fscache(rdata->mapping->host, page);
2927 page_cache_release(page);
2929 kref_put(&rdata->refcount, cifs_readdata_release);
2933 cifs_readpages_marshal_iov(struct cifs_readdata *rdata, unsigned int remaining)
2936 struct page *page, *tpage;
2940 /* determine the eof that the server (probably) has */
2941 eof = CIFS_I(rdata->mapping->host)->server_eof;
2942 eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0;
2943 cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index);
2946 list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
2947 if (remaining >= PAGE_CACHE_SIZE) {
2948 /* enough data to fill the page */
2949 rdata->iov[rdata->nr_iov].iov_base = kmap(page);
2950 rdata->iov[rdata->nr_iov].iov_len = PAGE_CACHE_SIZE;
2951 cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
2952 rdata->nr_iov, page->index,
2953 rdata->iov[rdata->nr_iov].iov_base,
2954 rdata->iov[rdata->nr_iov].iov_len);
2956 len += PAGE_CACHE_SIZE;
2957 remaining -= PAGE_CACHE_SIZE;
2958 } else if (remaining > 0) {
2959 /* enough for partial page, fill and zero the rest */
2960 rdata->iov[rdata->nr_iov].iov_base = kmap(page);
2961 rdata->iov[rdata->nr_iov].iov_len = remaining;
2962 cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu",
2963 rdata->nr_iov, page->index,
2964 rdata->iov[rdata->nr_iov].iov_base,
2965 rdata->iov[rdata->nr_iov].iov_len);
2966 memset(rdata->iov[rdata->nr_iov].iov_base + remaining,
2967 '\0', PAGE_CACHE_SIZE - remaining);
2971 } else if (page->index > eof_index) {
2973 * The VFS will not try to do readahead past the
2974 * i_size, but it's possible that we have outstanding
2975 * writes with gaps in the middle and the i_size hasn't
2976 * caught up yet. Populate those with zeroed out pages
2977 * to prevent the VFS from repeatedly attempting to
2978 * fill them until the writes are flushed.
2980 zero_user(page, 0, PAGE_CACHE_SIZE);
2981 list_del(&page->lru);
2982 lru_cache_add_file(page);
2983 flush_dcache_page(page);
2984 SetPageUptodate(page);
2986 page_cache_release(page);
2988 /* no need to hold page hostage */
2989 list_del(&page->lru);
2990 lru_cache_add_file(page);
2992 page_cache_release(page);
2999 static int cifs_readpages(struct file *file, struct address_space *mapping,
3000 struct list_head *page_list, unsigned num_pages)
3003 struct list_head tmplist;
3004 struct cifsFileInfo *open_file = file->private_data;
3005 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
3006 unsigned int rsize = cifs_sb->rsize;
3010 * Give up immediately if rsize is too small to read an entire page.
3011 * The VFS will fall back to readpage. We should never reach this
3012 * point however since we set ra_pages to 0 when the rsize is smaller
3013 * than a cache page.
3015 if (unlikely(rsize < PAGE_CACHE_SIZE))
3019 * Reads as many pages as possible from fscache. Returns -ENOBUFS
3020 * immediately if the cookie is negative
3022 rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
3027 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
3028 pid = open_file->pid;
3030 pid = current->tgid;
3033 INIT_LIST_HEAD(&tmplist);
3035 cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file,
3036 mapping, num_pages);
3039 * Start with the page at end of list and move it to private
3040 * list. Do the same with any following pages until we hit
3041 * the rsize limit, hit an index discontinuity, or run out of
3042 * pages. Issue the async read and then start the loop again
3043 * until the list is empty.
3045 * Note that list order is important. The page_list is in
3046 * the order of declining indexes. When we put the pages in
3047 * the rdata->pages, then we want them in increasing order.
3049 while (!list_empty(page_list)) {
3050 unsigned int bytes = PAGE_CACHE_SIZE;
3051 unsigned int expected_index;
3052 unsigned int nr_pages = 1;
3054 struct page *page, *tpage;
3055 struct cifs_readdata *rdata;
3057 page = list_entry(page_list->prev, struct page, lru);
3060 * Lock the page and put it in the cache. Since no one else
3061 * should have access to this page, we're safe to simply set
3062 * PG_locked without checking it first.
3064 __set_page_locked(page);
3065 rc = add_to_page_cache_locked(page, mapping,
3066 page->index, GFP_KERNEL);
3068 /* give up if we can't stick it in the cache */
3070 __clear_page_locked(page);
3074 /* move first page to the tmplist */
3075 offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
3076 list_move_tail(&page->lru, &tmplist);
3078 /* now try and add more pages onto the request */
3079 expected_index = page->index + 1;
3080 list_for_each_entry_safe_reverse(page, tpage, page_list, lru) {
3081 /* discontinuity ? */
3082 if (page->index != expected_index)
3085 /* would this page push the read over the rsize? */
3086 if (bytes + PAGE_CACHE_SIZE > rsize)
3089 __set_page_locked(page);
3090 if (add_to_page_cache_locked(page, mapping,
3091 page->index, GFP_KERNEL)) {
3092 __clear_page_locked(page);
3095 list_move_tail(&page->lru, &tmplist);
3096 bytes += PAGE_CACHE_SIZE;
3101 rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete);
3103 /* best to give up if we're out of mem */
3104 list_for_each_entry_safe(page, tpage, &tmplist, lru) {
3105 list_del(&page->lru);
3106 lru_cache_add_file(page);
3108 page_cache_release(page);
3114 rdata->cfile = cifsFileInfo_get(open_file);
3115 rdata->mapping = mapping;
3116 rdata->offset = offset;
3117 rdata->bytes = bytes;
3119 rdata->marshal_iov = cifs_readpages_marshal_iov;
3120 list_splice_init(&tmplist, &rdata->pages);
3122 rc = cifs_retry_async_readv(rdata);
3124 list_for_each_entry_safe(page, tpage, &rdata->pages,
3126 list_del(&page->lru);
3127 lru_cache_add_file(page);
3129 page_cache_release(page);
3131 kref_put(&rdata->refcount, cifs_readdata_release);
3135 kref_put(&rdata->refcount, cifs_readdata_release);
3141 static int cifs_readpage_worker(struct file *file, struct page *page,
3147 /* Is the page cached? */
3148 rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page);
3152 page_cache_get(page);
3153 read_data = kmap(page);
3154 /* for reads over a certain size could initiate async read ahead */
3156 rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
3161 cFYI(1, "Bytes read %d", rc);
3163 file->f_path.dentry->d_inode->i_atime =
3164 current_fs_time(file->f_path.dentry->d_inode->i_sb);
3166 if (PAGE_CACHE_SIZE > rc)
3167 memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
3169 flush_dcache_page(page);
3170 SetPageUptodate(page);
3172 /* send this page to the cache */
3173 cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page);
3179 page_cache_release(page);
3185 static int cifs_readpage(struct file *file, struct page *page)
3187 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
3193 if (file->private_data == NULL) {
3199 cFYI(1, "readpage %p at offset %d 0x%x",
3200 page, (int)offset, (int)offset);
3202 rc = cifs_readpage_worker(file, page, &offset);
3210 static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
3212 struct cifsFileInfo *open_file;
3214 spin_lock(&cifs_file_list_lock);
3215 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
3216 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
3217 spin_unlock(&cifs_file_list_lock);
3221 spin_unlock(&cifs_file_list_lock);
3225 /* We do not want to update the file size from server for inodes
3226 open for write - to avoid races with writepage extending
3227 the file - in the future we could consider allowing
3228 refreshing the inode only on increases in the file size
3229 but this is tricky to do without racing with writebehind
3230 page caching in the current Linux kernel design */
3231 bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
3236 if (is_inode_writable(cifsInode)) {
3237 /* This inode is open for write at least once */
3238 struct cifs_sb_info *cifs_sb;
3240 cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
3241 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
3242 /* since no page cache to corrupt on directio
3243 we can change size safely */
3247 if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
3255 static int cifs_write_begin(struct file *file, struct address_space *mapping,
3256 loff_t pos, unsigned len, unsigned flags,
3257 struct page **pagep, void **fsdata)
3259 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
3260 loff_t offset = pos & (PAGE_CACHE_SIZE - 1);
3261 loff_t page_start = pos & PAGE_MASK;
3266 cFYI(1, "write_begin from %lld len %d", (long long)pos, len);
3268 page = grab_cache_page_write_begin(mapping, index, flags);
3274 if (PageUptodate(page))
3278 * If we write a full page it will be up to date, no need to read from
3279 * the server. If the write is short, we'll end up doing a sync write
3282 if (len == PAGE_CACHE_SIZE)
3286 * optimize away the read when we have an oplock, and we're not
3287 * expecting to use any of the data we'd be reading in. That
3288 * is, when the page lies beyond the EOF, or straddles the EOF
3289 * and the write will cover all of the existing data.
3291 if (CIFS_I(mapping->host)->clientCanCacheRead) {
3292 i_size = i_size_read(mapping->host);
3293 if (page_start >= i_size ||
3294 (offset == 0 && (pos + len) >= i_size)) {
3295 zero_user_segments(page, 0, offset,
3299 * PageChecked means that the parts of the page
3300 * to which we're not writing are considered up
3301 * to date. Once the data is copied to the
3302 * page, it can be set uptodate.
3304 SetPageChecked(page);
3309 if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
3311 * might as well read a page, it is fast enough. If we get
3312 * an error, we don't need to return it. cifs_write_end will
3313 * do a sync write instead since PG_uptodate isn't set.
3315 cifs_readpage_worker(file, page, &page_start);
3317 /* we could try using another file handle if there is one -
3318 but how would we lock it to prevent close of that handle
3319 racing with this read? In any case
3320 this will be written out by write_end so is fine */
3327 static int cifs_release_page(struct page *page, gfp_t gfp)
3329 if (PagePrivate(page))
3332 return cifs_fscache_release_page(page, gfp);
3335 static void cifs_invalidate_page(struct page *page, unsigned long offset)
3337 struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
3340 cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
3343 static int cifs_launder_page(struct page *page)
3346 loff_t range_start = page_offset(page);
3347 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
3348 struct writeback_control wbc = {
3349 .sync_mode = WB_SYNC_ALL,
3351 .range_start = range_start,
3352 .range_end = range_end,
3355 cFYI(1, "Launder page: %p", page);
3357 if (clear_page_dirty_for_io(page))
3358 rc = cifs_writepage_locked(page, &wbc);
3360 cifs_fscache_invalidate_page(page, page->mapping->host);
3364 void cifs_oplock_break(struct work_struct *work)
3366 struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
3368 struct inode *inode = cfile->dentry->d_inode;
3369 struct cifsInodeInfo *cinode = CIFS_I(inode);
3372 if (inode && S_ISREG(inode->i_mode)) {
3373 if (cinode->clientCanCacheRead)
3374 break_lease(inode, O_RDONLY);
3376 break_lease(inode, O_WRONLY);
3377 rc = filemap_fdatawrite(inode->i_mapping);
3378 if (cinode->clientCanCacheRead == 0) {
3379 rc = filemap_fdatawait(inode->i_mapping);
3380 mapping_set_error(inode->i_mapping, rc);
3381 invalidate_remote_inode(inode);
3383 cFYI(1, "Oplock flush inode %p rc %d", inode, rc);
3386 rc = cifs_push_locks(cfile);
3388 cERROR(1, "Push locks rc = %d", rc);
3391 * releasing stale oplock after recent reconnect of smb session using
3392 * a now incorrect file handle is not a data integrity issue but do
3393 * not bother sending an oplock release if session to server still is
3394 * disconnected since oplock already released by the server
3396 if (!cfile->oplock_break_cancelled) {
3397 rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->fid.netfid,
3398 current->tgid, 0, 0, 0, 0,
3399 LOCKING_ANDX_OPLOCK_RELEASE, false,
3400 cinode->clientCanCacheRead ? 1 : 0);
3401 cFYI(1, "Oplock release rc = %d", rc);
3405 const struct address_space_operations cifs_addr_ops = {
3406 .readpage = cifs_readpage,
3407 .readpages = cifs_readpages,
3408 .writepage = cifs_writepage,
3409 .writepages = cifs_writepages,
3410 .write_begin = cifs_write_begin,
3411 .write_end = cifs_write_end,
3412 .set_page_dirty = __set_page_dirty_nobuffers,
3413 .releasepage = cifs_release_page,
3414 .invalidatepage = cifs_invalidate_page,
3415 .launder_page = cifs_launder_page,
3419 * cifs_readpages requires the server to support a buffer large enough to
3420 * contain the header plus one complete page of data. Otherwise, we need
3421 * to leave cifs_readpages out of the address space operations.
3423 const struct address_space_operations cifs_addr_ops_smallbuf = {
3424 .readpage = cifs_readpage,
3425 .writepage = cifs_writepage,
3426 .writepages = cifs_writepages,
3427 .write_begin = cifs_write_begin,
3428 .write_end = cifs_write_end,
3429 .set_page_dirty = __set_page_dirty_nobuffers,
3430 .releasepage = cifs_release_page,
3431 .invalidatepage = cifs_invalidate_page,
3432 .launder_page = cifs_launder_page,