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"
47 static inline int cifs_convert_flags(unsigned int flags)
49 if ((flags & O_ACCMODE) == O_RDONLY)
51 else if ((flags & O_ACCMODE) == O_WRONLY)
53 else if ((flags & O_ACCMODE) == O_RDWR) {
54 /* GENERIC_ALL is too much permission to request
55 can cause unnecessary access denied on create */
56 /* return GENERIC_ALL; */
57 return (GENERIC_READ | GENERIC_WRITE);
60 return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
61 FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
65 static u32 cifs_posix_convert_flags(unsigned int flags)
69 if ((flags & O_ACCMODE) == O_RDONLY)
70 posix_flags = SMB_O_RDONLY;
71 else if ((flags & O_ACCMODE) == O_WRONLY)
72 posix_flags = SMB_O_WRONLY;
73 else if ((flags & O_ACCMODE) == O_RDWR)
74 posix_flags = SMB_O_RDWR;
76 if (flags & O_CREAT) {
77 posix_flags |= SMB_O_CREAT;
79 posix_flags |= SMB_O_EXCL;
80 } else if (flags & O_EXCL)
81 cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n",
82 current->comm, current->tgid);
85 posix_flags |= SMB_O_TRUNC;
86 /* be safe and imply O_SYNC for O_DSYNC */
88 posix_flags |= SMB_O_SYNC;
89 if (flags & O_DIRECTORY)
90 posix_flags |= SMB_O_DIRECTORY;
91 if (flags & O_NOFOLLOW)
92 posix_flags |= SMB_O_NOFOLLOW;
94 posix_flags |= SMB_O_DIRECT;
99 static inline int cifs_get_disposition(unsigned int flags)
101 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
103 else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
104 return FILE_OVERWRITE_IF;
105 else if ((flags & O_CREAT) == O_CREAT)
107 else if ((flags & O_TRUNC) == O_TRUNC)
108 return FILE_OVERWRITE;
113 int cifs_posix_open(char *full_path, struct inode **pinode,
114 struct super_block *sb, int mode, unsigned int f_flags,
115 __u32 *poplock, __u16 *pnetfid, unsigned int xid)
118 FILE_UNIX_BASIC_INFO *presp_data;
119 __u32 posix_flags = 0;
120 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
121 struct cifs_fattr fattr;
122 struct tcon_link *tlink;
123 struct cifs_tcon *tcon;
125 cifs_dbg(FYI, "posix open %s\n", full_path);
127 presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
128 if (presp_data == NULL)
131 tlink = cifs_sb_tlink(cifs_sb);
137 tcon = tlink_tcon(tlink);
138 mode &= ~current_umask();
140 posix_flags = cifs_posix_convert_flags(f_flags);
141 rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
142 poplock, full_path, cifs_sb->local_nls,
143 cifs_sb->mnt_cifs_flags &
144 CIFS_MOUNT_MAP_SPECIAL_CHR);
145 cifs_put_tlink(tlink);
150 if (presp_data->Type == cpu_to_le32(-1))
151 goto posix_open_ret; /* open ok, caller does qpathinfo */
154 goto posix_open_ret; /* caller does not need info */
156 cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
158 /* get new inode and set it up */
159 if (*pinode == NULL) {
160 cifs_fill_uniqueid(sb, &fattr);
161 *pinode = cifs_iget(sb, &fattr);
167 cifs_fattr_to_inode(*pinode, &fattr);
176 cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
177 struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock,
178 struct cifs_fid *fid, unsigned int xid)
183 int create_options = CREATE_NOT_DIR;
185 struct TCP_Server_Info *server = tcon->ses->server;
187 if (!server->ops->open)
190 desired_access = cifs_convert_flags(f_flags);
192 /*********************************************************************
193 * open flag mapping table:
195 * POSIX Flag CIFS Disposition
196 * ---------- ----------------
197 * O_CREAT FILE_OPEN_IF
198 * O_CREAT | O_EXCL FILE_CREATE
199 * O_CREAT | O_TRUNC FILE_OVERWRITE_IF
200 * O_TRUNC FILE_OVERWRITE
201 * none of the above FILE_OPEN
203 * Note that there is not a direct match between disposition
204 * FILE_SUPERSEDE (ie create whether or not file exists although
205 * O_CREAT | O_TRUNC is similar but truncates the existing
206 * file rather than creating a new file as FILE_SUPERSEDE does
207 * (which uses the attributes / metadata passed in on open call)
209 *? O_SYNC is a reasonable match to CIFS writethrough flag
210 *? and the read write flags match reasonably. O_LARGEFILE
211 *? is irrelevant because largefile support is always used
212 *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
213 * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
214 *********************************************************************/
216 disposition = cifs_get_disposition(f_flags);
218 /* BB pass O_SYNC flag through on file attributes .. BB */
220 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
224 if (backup_cred(cifs_sb))
225 create_options |= CREATE_OPEN_BACKUP_INTENT;
227 rc = server->ops->open(xid, tcon, full_path, disposition,
228 desired_access, create_options, fid, oplock, buf,
235 rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
238 rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
247 cifs_has_mand_locks(struct cifsInodeInfo *cinode)
249 struct cifs_fid_locks *cur;
250 bool has_locks = false;
252 down_read(&cinode->lock_sem);
253 list_for_each_entry(cur, &cinode->llist, llist) {
254 if (!list_empty(&cur->locks)) {
259 up_read(&cinode->lock_sem);
263 struct cifsFileInfo *
264 cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
265 struct tcon_link *tlink, __u32 oplock)
267 struct dentry *dentry = file->f_path.dentry;
268 struct inode *inode = dentry->d_inode;
269 struct cifsInodeInfo *cinode = CIFS_I(inode);
270 struct cifsFileInfo *cfile;
271 struct cifs_fid_locks *fdlocks;
272 struct cifs_tcon *tcon = tlink_tcon(tlink);
273 struct TCP_Server_Info *server = tcon->ses->server;
275 cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
279 fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL);
285 INIT_LIST_HEAD(&fdlocks->locks);
286 fdlocks->cfile = cfile;
287 cfile->llist = fdlocks;
288 down_write(&cinode->lock_sem);
289 list_add(&fdlocks->llist, &cinode->llist);
290 up_write(&cinode->lock_sem);
293 cfile->pid = current->tgid;
294 cfile->uid = current_fsuid();
295 cfile->dentry = dget(dentry);
296 cfile->f_flags = file->f_flags;
297 cfile->invalidHandle = false;
298 cfile->tlink = cifs_get_tlink(tlink);
299 INIT_WORK(&cfile->oplock_break, cifs_oplock_break);
300 mutex_init(&cfile->fh_mutex);
302 cifs_sb_active(inode->i_sb);
305 * If the server returned a read oplock and we have mandatory brlocks,
306 * set oplock level to None.
308 if (oplock == server->vals->oplock_read &&
309 cifs_has_mand_locks(cinode)) {
310 cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n");
314 spin_lock(&cifs_file_list_lock);
315 if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock)
316 oplock = fid->pending_open->oplock;
317 list_del(&fid->pending_open->olist);
319 server->ops->set_fid(cfile, fid, oplock);
321 list_add(&cfile->tlist, &tcon->openFileList);
322 /* if readable file instance put first in list*/
323 if (file->f_mode & FMODE_READ)
324 list_add(&cfile->flist, &cinode->openFileList);
326 list_add_tail(&cfile->flist, &cinode->openFileList);
327 spin_unlock(&cifs_file_list_lock);
329 file->private_data = cfile;
333 struct cifsFileInfo *
334 cifsFileInfo_get(struct cifsFileInfo *cifs_file)
336 spin_lock(&cifs_file_list_lock);
337 cifsFileInfo_get_locked(cifs_file);
338 spin_unlock(&cifs_file_list_lock);
343 * Release a reference on the file private data. This may involve closing
344 * the filehandle out on the server. Must be called without holding
345 * cifs_file_list_lock.
347 void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
349 struct inode *inode = cifs_file->dentry->d_inode;
350 struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink);
351 struct TCP_Server_Info *server = tcon->ses->server;
352 struct cifsInodeInfo *cifsi = CIFS_I(inode);
353 struct super_block *sb = inode->i_sb;
354 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
355 struct cifsLockInfo *li, *tmp;
357 struct cifs_pending_open open;
359 spin_lock(&cifs_file_list_lock);
360 if (--cifs_file->count > 0) {
361 spin_unlock(&cifs_file_list_lock);
365 if (server->ops->get_lease_key)
366 server->ops->get_lease_key(inode, &fid);
368 /* store open in pending opens to make sure we don't miss lease break */
369 cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open);
371 /* remove it from the lists */
372 list_del(&cifs_file->flist);
373 list_del(&cifs_file->tlist);
375 if (list_empty(&cifsi->openFileList)) {
376 cifs_dbg(FYI, "closing last open instance for inode %p\n",
377 cifs_file->dentry->d_inode);
379 * In strict cache mode we need invalidate mapping on the last
380 * close because it may cause a error when we open this file
381 * again and get at least level II oplock.
383 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
384 CIFS_I(inode)->invalid_mapping = true;
385 cifs_set_oplock_level(cifsi, 0);
387 spin_unlock(&cifs_file_list_lock);
389 cancel_work_sync(&cifs_file->oplock_break);
391 if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
392 struct TCP_Server_Info *server = tcon->ses->server;
396 if (server->ops->close)
397 server->ops->close(xid, tcon, &cifs_file->fid);
401 cifs_del_pending_open(&open);
404 * Delete any outstanding lock records. We'll lose them when the file
407 down_write(&cifsi->lock_sem);
408 list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) {
409 list_del(&li->llist);
410 cifs_del_lock_waiters(li);
413 list_del(&cifs_file->llist->llist);
414 kfree(cifs_file->llist);
415 up_write(&cifsi->lock_sem);
417 cifs_put_tlink(cifs_file->tlink);
418 dput(cifs_file->dentry);
419 cifs_sb_deactive(sb);
423 int cifs_open(struct inode *inode, struct file *file)
429 struct cifs_sb_info *cifs_sb;
430 struct TCP_Server_Info *server;
431 struct cifs_tcon *tcon;
432 struct tcon_link *tlink;
433 struct cifsFileInfo *cfile = NULL;
434 char *full_path = NULL;
435 bool posix_open_ok = false;
437 struct cifs_pending_open open;
441 cifs_sb = CIFS_SB(inode->i_sb);
442 tlink = cifs_sb_tlink(cifs_sb);
445 return PTR_ERR(tlink);
447 tcon = tlink_tcon(tlink);
448 server = tcon->ses->server;
450 full_path = build_path_from_dentry(file->f_path.dentry);
451 if (full_path == NULL) {
456 cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n",
457 inode, file->f_flags, full_path);
464 if (!tcon->broken_posix_open && tcon->unix_ext &&
465 cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
466 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
467 /* can not refresh inode info since size could be stale */
468 rc = cifs_posix_open(full_path, &inode, inode->i_sb,
469 cifs_sb->mnt_file_mode /* ignored */,
470 file->f_flags, &oplock, &fid.netfid, xid);
472 cifs_dbg(FYI, "posix open succeeded\n");
473 posix_open_ok = true;
474 } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
475 if (tcon->ses->serverNOS)
476 cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n",
477 tcon->ses->serverName,
478 tcon->ses->serverNOS);
479 tcon->broken_posix_open = true;
480 } else if ((rc != -EIO) && (rc != -EREMOTE) &&
481 (rc != -EOPNOTSUPP)) /* path not found or net err */
484 * Else fallthrough to retry open the old way on network i/o
489 if (server->ops->get_lease_key)
490 server->ops->get_lease_key(inode, &fid);
492 cifs_add_pending_open(&fid, tlink, &open);
494 if (!posix_open_ok) {
495 if (server->ops->get_lease_key)
496 server->ops->get_lease_key(inode, &fid);
498 rc = cifs_nt_open(full_path, inode, cifs_sb, tcon,
499 file->f_flags, &oplock, &fid, xid);
501 cifs_del_pending_open(&open);
506 cfile = cifs_new_fileinfo(&fid, file, tlink, oplock);
508 if (server->ops->close)
509 server->ops->close(xid, tcon, &fid);
510 cifs_del_pending_open(&open);
515 cifs_fscache_set_inode_cookie(inode, file);
517 if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
519 * Time to set mode which we can not set earlier due to
520 * problems creating new read-only files.
522 struct cifs_unix_set_info_args args = {
523 .mode = inode->i_mode,
524 .uid = INVALID_UID, /* no change */
525 .gid = INVALID_GID, /* no change */
526 .ctime = NO_CHANGE_64,
527 .atime = NO_CHANGE_64,
528 .mtime = NO_CHANGE_64,
531 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid,
538 cifs_put_tlink(tlink);
542 static int cifs_push_posix_locks(struct cifsFileInfo *cfile);
545 * Try to reacquire byte range locks that were released when session
546 * to server was lost.
549 cifs_relock_file(struct cifsFileInfo *cfile)
551 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
552 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
553 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
556 down_read(&cinode->lock_sem);
557 if (cinode->can_cache_brlcks) {
558 /* can cache locks - no need to relock */
559 up_read(&cinode->lock_sem);
563 if (cap_unix(tcon->ses) &&
564 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
565 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
566 rc = cifs_push_posix_locks(cfile);
568 rc = tcon->ses->server->ops->push_mand_locks(cfile);
570 up_read(&cinode->lock_sem);
575 cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
580 struct cifs_sb_info *cifs_sb;
581 struct cifs_tcon *tcon;
582 struct TCP_Server_Info *server;
583 struct cifsInodeInfo *cinode;
585 char *full_path = NULL;
587 int disposition = FILE_OPEN;
588 int create_options = CREATE_NOT_DIR;
592 mutex_lock(&cfile->fh_mutex);
593 if (!cfile->invalidHandle) {
594 mutex_unlock(&cfile->fh_mutex);
600 inode = cfile->dentry->d_inode;
601 cifs_sb = CIFS_SB(inode->i_sb);
602 tcon = tlink_tcon(cfile->tlink);
603 server = tcon->ses->server;
606 * Can not grab rename sem here because various ops, including those
607 * that already have the rename sem can end up causing writepage to get
608 * called and if the server was down that means we end up here, and we
609 * can never tell if the caller already has the rename_sem.
611 full_path = build_path_from_dentry(cfile->dentry);
612 if (full_path == NULL) {
614 mutex_unlock(&cfile->fh_mutex);
619 cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n",
620 inode, cfile->f_flags, full_path);
622 if (tcon->ses->server->oplocks)
627 if (tcon->unix_ext && cap_unix(tcon->ses) &&
628 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
629 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
631 * O_CREAT, O_EXCL and O_TRUNC already had their effect on the
632 * original open. Must mask them off for a reopen.
634 unsigned int oflags = cfile->f_flags &
635 ~(O_CREAT | O_EXCL | O_TRUNC);
637 rc = cifs_posix_open(full_path, NULL, inode->i_sb,
638 cifs_sb->mnt_file_mode /* ignored */,
639 oflags, &oplock, &fid.netfid, xid);
641 cifs_dbg(FYI, "posix reopen succeeded\n");
645 * fallthrough to retry open the old way on errors, especially
646 * in the reconnect path it is important to retry hard
650 desired_access = cifs_convert_flags(cfile->f_flags);
652 if (backup_cred(cifs_sb))
653 create_options |= CREATE_OPEN_BACKUP_INTENT;
655 if (server->ops->get_lease_key)
656 server->ops->get_lease_key(inode, &fid);
659 * Can not refresh inode by passing in file_info buf to be returned by
660 * CIFSSMBOpen and then calling get_inode_info with returned buf since
661 * file might have write behind data that needs to be flushed and server
662 * version of file size can be stale. If we knew for sure that inode was
663 * not dirty locally we could do this.
665 rc = server->ops->open(xid, tcon, full_path, disposition,
666 desired_access, create_options, &fid, &oplock,
669 mutex_unlock(&cfile->fh_mutex);
670 cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc);
671 cifs_dbg(FYI, "oplock: %d\n", oplock);
672 goto reopen_error_exit;
676 cfile->invalidHandle = false;
677 mutex_unlock(&cfile->fh_mutex);
678 cinode = CIFS_I(inode);
681 rc = filemap_write_and_wait(inode->i_mapping);
682 mapping_set_error(inode->i_mapping, rc);
685 rc = cifs_get_inode_info_unix(&inode, full_path,
688 rc = cifs_get_inode_info(&inode, full_path, NULL,
689 inode->i_sb, xid, NULL);
692 * Else we are writing out data to server already and could deadlock if
693 * we tried to flush data, and since we do not know if we have data that
694 * would invalidate the current end of file on the server we can not go
695 * to the server to get the new inode info.
698 server->ops->set_fid(cfile, &fid, oplock);
699 cifs_relock_file(cfile);
707 int cifs_close(struct inode *inode, struct file *file)
709 if (file->private_data != NULL) {
710 cifsFileInfo_put(file->private_data);
711 file->private_data = NULL;
714 /* return code from the ->release op is always ignored */
718 int cifs_closedir(struct inode *inode, struct file *file)
722 struct cifsFileInfo *cfile = file->private_data;
723 struct cifs_tcon *tcon;
724 struct TCP_Server_Info *server;
727 cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode);
733 tcon = tlink_tcon(cfile->tlink);
734 server = tcon->ses->server;
736 cifs_dbg(FYI, "Freeing private data in close dir\n");
737 spin_lock(&cifs_file_list_lock);
738 if (server->ops->dir_needs_close(cfile)) {
739 cfile->invalidHandle = true;
740 spin_unlock(&cifs_file_list_lock);
741 if (server->ops->close_dir)
742 rc = server->ops->close_dir(xid, tcon, &cfile->fid);
745 cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc);
746 /* not much we can do if it fails anyway, ignore rc */
749 spin_unlock(&cifs_file_list_lock);
751 buf = cfile->srch_inf.ntwrk_buf_start;
753 cifs_dbg(FYI, "closedir free smb buf in srch struct\n");
754 cfile->srch_inf.ntwrk_buf_start = NULL;
755 if (cfile->srch_inf.smallBuf)
756 cifs_small_buf_release(buf);
758 cifs_buf_release(buf);
761 cifs_put_tlink(cfile->tlink);
762 kfree(file->private_data);
763 file->private_data = NULL;
764 /* BB can we lock the filestruct while this is going on? */
769 static struct cifsLockInfo *
770 cifs_lock_init(__u64 offset, __u64 length, __u8 type)
772 struct cifsLockInfo *lock =
773 kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
776 lock->offset = offset;
777 lock->length = length;
779 lock->pid = current->tgid;
780 INIT_LIST_HEAD(&lock->blist);
781 init_waitqueue_head(&lock->block_q);
786 cifs_del_lock_waiters(struct cifsLockInfo *lock)
788 struct cifsLockInfo *li, *tmp;
789 list_for_each_entry_safe(li, tmp, &lock->blist, blist) {
790 list_del_init(&li->blist);
791 wake_up(&li->block_q);
795 #define CIFS_LOCK_OP 0
796 #define CIFS_READ_OP 1
797 #define CIFS_WRITE_OP 2
799 /* @rw_check : 0 - no op, 1 - read, 2 - write */
801 cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset,
802 __u64 length, __u8 type, struct cifsFileInfo *cfile,
803 struct cifsLockInfo **conf_lock, int rw_check)
805 struct cifsLockInfo *li;
806 struct cifsFileInfo *cur_cfile = fdlocks->cfile;
807 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
809 list_for_each_entry(li, &fdlocks->locks, llist) {
810 if (offset + length <= li->offset ||
811 offset >= li->offset + li->length)
813 if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid &&
814 server->ops->compare_fids(cfile, cur_cfile)) {
815 /* shared lock prevents write op through the same fid */
816 if (!(li->type & server->vals->shared_lock_type) ||
817 rw_check != CIFS_WRITE_OP)
820 if ((type & server->vals->shared_lock_type) &&
821 ((server->ops->compare_fids(cfile, cur_cfile) &&
822 current->tgid == li->pid) || type == li->type))
832 cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
833 __u8 type, struct cifsLockInfo **conf_lock,
837 struct cifs_fid_locks *cur;
838 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
840 list_for_each_entry(cur, &cinode->llist, llist) {
841 rc = cifs_find_fid_lock_conflict(cur, offset, length, type,
842 cfile, conf_lock, rw_check);
851 * Check if there is another lock that prevents us to set the lock (mandatory
852 * style). If such a lock exists, update the flock structure with its
853 * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
854 * or leave it the same if we can't. Returns 0 if we don't need to request to
855 * the server or 1 otherwise.
858 cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
859 __u8 type, struct file_lock *flock)
862 struct cifsLockInfo *conf_lock;
863 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
864 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
867 down_read(&cinode->lock_sem);
869 exist = cifs_find_lock_conflict(cfile, offset, length, type,
870 &conf_lock, CIFS_LOCK_OP);
872 flock->fl_start = conf_lock->offset;
873 flock->fl_end = conf_lock->offset + conf_lock->length - 1;
874 flock->fl_pid = conf_lock->pid;
875 if (conf_lock->type & server->vals->shared_lock_type)
876 flock->fl_type = F_RDLCK;
878 flock->fl_type = F_WRLCK;
879 } else if (!cinode->can_cache_brlcks)
882 flock->fl_type = F_UNLCK;
884 up_read(&cinode->lock_sem);
889 cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock)
891 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
892 down_write(&cinode->lock_sem);
893 list_add_tail(&lock->llist, &cfile->llist->locks);
894 up_write(&cinode->lock_sem);
898 * Set the byte-range lock (mandatory style). Returns:
899 * 1) 0, if we set the lock and don't need to request to the server;
900 * 2) 1, if no locks prevent us but we need to request to the server;
901 * 3) -EACCESS, if there is a lock that prevents us and wait is false.
904 cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock,
907 struct cifsLockInfo *conf_lock;
908 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
914 down_write(&cinode->lock_sem);
916 exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length,
917 lock->type, &conf_lock, CIFS_LOCK_OP);
918 if (!exist && cinode->can_cache_brlcks) {
919 list_add_tail(&lock->llist, &cfile->llist->locks);
920 up_write(&cinode->lock_sem);
929 list_add_tail(&lock->blist, &conf_lock->blist);
930 up_write(&cinode->lock_sem);
931 rc = wait_event_interruptible(lock->block_q,
932 (lock->blist.prev == &lock->blist) &&
933 (lock->blist.next == &lock->blist));
936 down_write(&cinode->lock_sem);
937 list_del_init(&lock->blist);
940 up_write(&cinode->lock_sem);
945 * Check if there is another lock that prevents us to set the lock (posix
946 * style). If such a lock exists, update the flock structure with its
947 * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
948 * or leave it the same if we can't. Returns 0 if we don't need to request to
949 * the server or 1 otherwise.
952 cifs_posix_lock_test(struct file *file, struct file_lock *flock)
955 struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
956 unsigned char saved_type = flock->fl_type;
958 if ((flock->fl_flags & FL_POSIX) == 0)
961 down_read(&cinode->lock_sem);
962 posix_test_lock(file, flock);
964 if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) {
965 flock->fl_type = saved_type;
969 up_read(&cinode->lock_sem);
974 * Set the byte-range lock (posix style). Returns:
975 * 1) 0, if we set the lock and don't need to request to the server;
976 * 2) 1, if we need to request to the server;
977 * 3) <0, if the error occurs while setting the lock.
980 cifs_posix_lock_set(struct file *file, struct file_lock *flock)
982 struct cifsInodeInfo *cinode = CIFS_I(file_inode(file));
985 if ((flock->fl_flags & FL_POSIX) == 0)
989 down_write(&cinode->lock_sem);
990 if (!cinode->can_cache_brlcks) {
991 up_write(&cinode->lock_sem);
995 rc = posix_lock_file(file, flock, NULL);
996 up_write(&cinode->lock_sem);
997 if (rc == FILE_LOCK_DEFERRED) {
998 rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next);
1001 locks_delete_block(flock);
1007 cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
1010 int rc = 0, stored_rc;
1011 struct cifsLockInfo *li, *tmp;
1012 struct cifs_tcon *tcon;
1013 unsigned int num, max_num, max_buf;
1014 LOCKING_ANDX_RANGE *buf, *cur;
1015 int types[] = {LOCKING_ANDX_LARGE_FILES,
1016 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
1020 tcon = tlink_tcon(cfile->tlink);
1023 * Accessing maxBuf is racy with cifs_reconnect - need to store value
1024 * and check it for zero before using.
1026 max_buf = tcon->ses->server->maxBuf;
1032 max_num = (max_buf - sizeof(struct smb_hdr)) /
1033 sizeof(LOCKING_ANDX_RANGE);
1034 buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
1040 for (i = 0; i < 2; i++) {
1043 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
1044 if (li->type != types[i])
1046 cur->Pid = cpu_to_le16(li->pid);
1047 cur->LengthLow = cpu_to_le32((u32)li->length);
1048 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
1049 cur->OffsetLow = cpu_to_le32((u32)li->offset);
1050 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
1051 if (++num == max_num) {
1052 stored_rc = cifs_lockv(xid, tcon,
1054 (__u8)li->type, 0, num,
1065 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
1066 (__u8)types[i], 0, num, buf);
1077 /* copied from fs/locks.c with a name change */
1078 #define cifs_for_each_lock(inode, lockp) \
1079 for (lockp = &inode->i_flock; *lockp != NULL; \
1080 lockp = &(*lockp)->fl_next)
1082 struct lock_to_push {
1083 struct list_head llist;
1092 cifs_push_posix_locks(struct cifsFileInfo *cfile)
1094 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1095 struct file_lock *flock, **before;
1096 unsigned int count = 0, i = 0;
1097 int rc = 0, xid, type;
1098 struct list_head locks_to_send, *el;
1099 struct lock_to_push *lck, *tmp;
1105 cifs_for_each_lock(cfile->dentry->d_inode, before) {
1106 if ((*before)->fl_flags & FL_POSIX)
1111 INIT_LIST_HEAD(&locks_to_send);
1114 * Allocating count locks is enough because no FL_POSIX locks can be
1115 * added to the list while we are holding cinode->lock_sem that
1116 * protects locking operations of this inode.
1118 for (; i < count; i++) {
1119 lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
1124 list_add_tail(&lck->llist, &locks_to_send);
1127 el = locks_to_send.next;
1129 cifs_for_each_lock(cfile->dentry->d_inode, before) {
1131 if ((flock->fl_flags & FL_POSIX) == 0)
1133 if (el == &locks_to_send) {
1135 * The list ended. We don't have enough allocated
1136 * structures - something is really wrong.
1138 cifs_dbg(VFS, "Can't push all brlocks!\n");
1141 length = 1 + flock->fl_end - flock->fl_start;
1142 if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK)
1146 lck = list_entry(el, struct lock_to_push, llist);
1147 lck->pid = flock->fl_pid;
1148 lck->netfid = cfile->fid.netfid;
1149 lck->length = length;
1151 lck->offset = flock->fl_start;
1156 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
1159 stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid,
1160 lck->offset, lck->length, NULL,
1164 list_del(&lck->llist);
1172 list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
1173 list_del(&lck->llist);
1180 cifs_push_locks(struct cifsFileInfo *cfile)
1182 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
1183 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
1184 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1187 /* we are going to update can_cache_brlcks here - need a write access */
1188 down_write(&cinode->lock_sem);
1189 if (!cinode->can_cache_brlcks) {
1190 up_write(&cinode->lock_sem);
1194 if (cap_unix(tcon->ses) &&
1195 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
1196 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
1197 rc = cifs_push_posix_locks(cfile);
1199 rc = tcon->ses->server->ops->push_mand_locks(cfile);
1201 cinode->can_cache_brlcks = false;
1202 up_write(&cinode->lock_sem);
1207 cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock,
1208 bool *wait_flag, struct TCP_Server_Info *server)
1210 if (flock->fl_flags & FL_POSIX)
1211 cifs_dbg(FYI, "Posix\n");
1212 if (flock->fl_flags & FL_FLOCK)
1213 cifs_dbg(FYI, "Flock\n");
1214 if (flock->fl_flags & FL_SLEEP) {
1215 cifs_dbg(FYI, "Blocking lock\n");
1218 if (flock->fl_flags & FL_ACCESS)
1219 cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n");
1220 if (flock->fl_flags & FL_LEASE)
1221 cifs_dbg(FYI, "Lease on file - not implemented yet\n");
1222 if (flock->fl_flags &
1223 (~(FL_POSIX | FL_FLOCK | FL_SLEEP |
1224 FL_ACCESS | FL_LEASE | FL_CLOSE)))
1225 cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags);
1227 *type = server->vals->large_lock_type;
1228 if (flock->fl_type == F_WRLCK) {
1229 cifs_dbg(FYI, "F_WRLCK\n");
1230 *type |= server->vals->exclusive_lock_type;
1232 } else if (flock->fl_type == F_UNLCK) {
1233 cifs_dbg(FYI, "F_UNLCK\n");
1234 *type |= server->vals->unlock_lock_type;
1236 /* Check if unlock includes more than one lock range */
1237 } else if (flock->fl_type == F_RDLCK) {
1238 cifs_dbg(FYI, "F_RDLCK\n");
1239 *type |= server->vals->shared_lock_type;
1241 } else if (flock->fl_type == F_EXLCK) {
1242 cifs_dbg(FYI, "F_EXLCK\n");
1243 *type |= server->vals->exclusive_lock_type;
1245 } else if (flock->fl_type == F_SHLCK) {
1246 cifs_dbg(FYI, "F_SHLCK\n");
1247 *type |= server->vals->shared_lock_type;
1250 cifs_dbg(FYI, "Unknown type of lock\n");
1254 cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
1255 bool wait_flag, bool posix_lck, unsigned int xid)
1258 __u64 length = 1 + flock->fl_end - flock->fl_start;
1259 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
1260 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1261 struct TCP_Server_Info *server = tcon->ses->server;
1262 __u16 netfid = cfile->fid.netfid;
1265 int posix_lock_type;
1267 rc = cifs_posix_lock_test(file, flock);
1271 if (type & server->vals->shared_lock_type)
1272 posix_lock_type = CIFS_RDLCK;
1274 posix_lock_type = CIFS_WRLCK;
1275 rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid,
1276 flock->fl_start, length, flock,
1277 posix_lock_type, wait_flag);
1281 rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock);
1285 /* BB we could chain these into one lock request BB */
1286 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type,
1289 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1291 flock->fl_type = F_UNLCK;
1293 cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
1298 if (type & server->vals->shared_lock_type) {
1299 flock->fl_type = F_WRLCK;
1303 type &= ~server->vals->exclusive_lock_type;
1305 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1306 type | server->vals->shared_lock_type,
1309 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1310 type | server->vals->shared_lock_type, 0, 1, false);
1311 flock->fl_type = F_RDLCK;
1313 cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n",
1316 flock->fl_type = F_WRLCK;
1322 cifs_move_llist(struct list_head *source, struct list_head *dest)
1324 struct list_head *li, *tmp;
1325 list_for_each_safe(li, tmp, source)
1326 list_move(li, dest);
1330 cifs_free_llist(struct list_head *llist)
1332 struct cifsLockInfo *li, *tmp;
1333 list_for_each_entry_safe(li, tmp, llist, llist) {
1334 cifs_del_lock_waiters(li);
1335 list_del(&li->llist);
1341 cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
1344 int rc = 0, stored_rc;
1345 int types[] = {LOCKING_ANDX_LARGE_FILES,
1346 LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
1348 unsigned int max_num, num, max_buf;
1349 LOCKING_ANDX_RANGE *buf, *cur;
1350 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1351 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
1352 struct cifsLockInfo *li, *tmp;
1353 __u64 length = 1 + flock->fl_end - flock->fl_start;
1354 struct list_head tmp_llist;
1356 INIT_LIST_HEAD(&tmp_llist);
1359 * Accessing maxBuf is racy with cifs_reconnect - need to store value
1360 * and check it for zero before using.
1362 max_buf = tcon->ses->server->maxBuf;
1366 max_num = (max_buf - sizeof(struct smb_hdr)) /
1367 sizeof(LOCKING_ANDX_RANGE);
1368 buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
1372 down_write(&cinode->lock_sem);
1373 for (i = 0; i < 2; i++) {
1376 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
1377 if (flock->fl_start > li->offset ||
1378 (flock->fl_start + length) <
1379 (li->offset + li->length))
1381 if (current->tgid != li->pid)
1383 if (types[i] != li->type)
1385 if (cinode->can_cache_brlcks) {
1387 * We can cache brlock requests - simply remove
1388 * a lock from the file's list.
1390 list_del(&li->llist);
1391 cifs_del_lock_waiters(li);
1395 cur->Pid = cpu_to_le16(li->pid);
1396 cur->LengthLow = cpu_to_le32((u32)li->length);
1397 cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
1398 cur->OffsetLow = cpu_to_le32((u32)li->offset);
1399 cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
1401 * We need to save a lock here to let us add it again to
1402 * the file's list if the unlock range request fails on
1405 list_move(&li->llist, &tmp_llist);
1406 if (++num == max_num) {
1407 stored_rc = cifs_lockv(xid, tcon,
1409 li->type, num, 0, buf);
1412 * We failed on the unlock range
1413 * request - add all locks from the tmp
1414 * list to the head of the file's list.
1416 cifs_move_llist(&tmp_llist,
1417 &cfile->llist->locks);
1421 * The unlock range request succeed -
1422 * free the tmp list.
1424 cifs_free_llist(&tmp_llist);
1431 stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
1432 types[i], num, 0, buf);
1434 cifs_move_llist(&tmp_llist,
1435 &cfile->llist->locks);
1438 cifs_free_llist(&tmp_llist);
1442 up_write(&cinode->lock_sem);
1448 cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
1449 bool wait_flag, bool posix_lck, int lock, int unlock,
1453 __u64 length = 1 + flock->fl_end - flock->fl_start;
1454 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
1455 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
1456 struct TCP_Server_Info *server = tcon->ses->server;
1457 struct inode *inode = cfile->dentry->d_inode;
1460 int posix_lock_type;
1462 rc = cifs_posix_lock_set(file, flock);
1466 if (type & server->vals->shared_lock_type)
1467 posix_lock_type = CIFS_RDLCK;
1469 posix_lock_type = CIFS_WRLCK;
1472 posix_lock_type = CIFS_UNLCK;
1474 rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid,
1475 current->tgid, flock->fl_start, length,
1476 NULL, posix_lock_type, wait_flag);
1481 struct cifsLockInfo *lock;
1483 lock = cifs_lock_init(flock->fl_start, length, type);
1487 rc = cifs_lock_add_if(cfile, lock, wait_flag);
1496 * Windows 7 server can delay breaking lease from read to None
1497 * if we set a byte-range lock on a file - break it explicitly
1498 * before sending the lock to the server to be sure the next
1499 * read won't conflict with non-overlapted locks due to
1502 if (!CIFS_I(inode)->clientCanCacheAll &&
1503 CIFS_I(inode)->clientCanCacheRead) {
1504 cifs_invalidate_mapping(inode);
1505 cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n",
1507 CIFS_I(inode)->clientCanCacheRead = false;
1510 rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
1511 type, 1, 0, wait_flag);
1517 cifs_lock_add(cfile, lock);
1519 rc = server->ops->mand_unlock_range(cfile, flock, xid);
1522 if (flock->fl_flags & FL_POSIX)
1523 posix_lock_file_wait(file, flock);
1527 int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
1530 int lock = 0, unlock = 0;
1531 bool wait_flag = false;
1532 bool posix_lck = false;
1533 struct cifs_sb_info *cifs_sb;
1534 struct cifs_tcon *tcon;
1535 struct cifsInodeInfo *cinode;
1536 struct cifsFileInfo *cfile;
1543 cifs_dbg(FYI, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld end: %lld\n",
1544 cmd, flock->fl_flags, flock->fl_type,
1545 flock->fl_start, flock->fl_end);
1547 cfile = (struct cifsFileInfo *)file->private_data;
1548 tcon = tlink_tcon(cfile->tlink);
1550 cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag,
1553 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1554 netfid = cfile->fid.netfid;
1555 cinode = CIFS_I(file_inode(file));
1557 if (cap_unix(tcon->ses) &&
1558 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
1559 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
1562 * BB add code here to normalize offset and length to account for
1563 * negative length which we can not accept over the wire.
1565 if (IS_GETLK(cmd)) {
1566 rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid);
1571 if (!lock && !unlock) {
1573 * if no lock or unlock then nothing to do since we do not
1580 rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock,
1587 * update the file size (if needed) after a write. Should be called with
1588 * the inode->i_lock held
1591 cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
1592 unsigned int bytes_written)
1594 loff_t end_of_write = offset + bytes_written;
1596 if (end_of_write > cifsi->server_eof)
1597 cifsi->server_eof = end_of_write;
1601 cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data,
1602 size_t write_size, loff_t *offset)
1605 unsigned int bytes_written = 0;
1606 unsigned int total_written;
1607 struct cifs_sb_info *cifs_sb;
1608 struct cifs_tcon *tcon;
1609 struct TCP_Server_Info *server;
1611 struct dentry *dentry = open_file->dentry;
1612 struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode);
1613 struct cifs_io_parms io_parms;
1615 cifs_sb = CIFS_SB(dentry->d_sb);
1617 cifs_dbg(FYI, "write %zd bytes to offset %lld of %s\n",
1618 write_size, *offset, dentry->d_name.name);
1620 tcon = tlink_tcon(open_file->tlink);
1621 server = tcon->ses->server;
1623 if (!server->ops->sync_write)
1628 for (total_written = 0; write_size > total_written;
1629 total_written += bytes_written) {
1631 while (rc == -EAGAIN) {
1635 if (open_file->invalidHandle) {
1636 /* we could deadlock if we called
1637 filemap_fdatawait from here so tell
1638 reopen_file not to flush data to
1640 rc = cifs_reopen_file(open_file, false);
1645 len = min((size_t)cifs_sb->wsize,
1646 write_size - total_written);
1647 /* iov[0] is reserved for smb header */
1648 iov[1].iov_base = (char *)write_data + total_written;
1649 iov[1].iov_len = len;
1651 io_parms.tcon = tcon;
1652 io_parms.offset = *offset;
1653 io_parms.length = len;
1654 rc = server->ops->sync_write(xid, open_file, &io_parms,
1655 &bytes_written, iov, 1);
1657 if (rc || (bytes_written == 0)) {
1665 spin_lock(&dentry->d_inode->i_lock);
1666 cifs_update_eof(cifsi, *offset, bytes_written);
1667 spin_unlock(&dentry->d_inode->i_lock);
1668 *offset += bytes_written;
1672 cifs_stats_bytes_written(tcon, total_written);
1674 if (total_written > 0) {
1675 spin_lock(&dentry->d_inode->i_lock);
1676 if (*offset > dentry->d_inode->i_size)
1677 i_size_write(dentry->d_inode, *offset);
1678 spin_unlock(&dentry->d_inode->i_lock);
1680 mark_inode_dirty_sync(dentry->d_inode);
1682 return total_written;
1685 struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
1688 struct cifsFileInfo *open_file = NULL;
1689 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1691 /* only filter by fsuid on multiuser mounts */
1692 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1695 spin_lock(&cifs_file_list_lock);
1696 /* we could simply get the first_list_entry since write-only entries
1697 are always at the end of the list but since the first entry might
1698 have a close pending, we go through the whole list */
1699 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1700 if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
1702 if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
1703 if (!open_file->invalidHandle) {
1704 /* found a good file */
1705 /* lock it so it will not be closed on us */
1706 cifsFileInfo_get_locked(open_file);
1707 spin_unlock(&cifs_file_list_lock);
1709 } /* else might as well continue, and look for
1710 another, or simply have the caller reopen it
1711 again rather than trying to fix this handle */
1712 } else /* write only file */
1713 break; /* write only files are last so must be done */
1715 spin_unlock(&cifs_file_list_lock);
1719 struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
1722 struct cifsFileInfo *open_file, *inv_file = NULL;
1723 struct cifs_sb_info *cifs_sb;
1724 bool any_available = false;
1726 unsigned int refind = 0;
1728 /* Having a null inode here (because mapping->host was set to zero by
1729 the VFS or MM) should not happen but we had reports of on oops (due to
1730 it being zero) during stress testcases so we need to check for it */
1732 if (cifs_inode == NULL) {
1733 cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n");
1738 cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1740 /* only filter by fsuid on multiuser mounts */
1741 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1744 spin_lock(&cifs_file_list_lock);
1746 if (refind > MAX_REOPEN_ATT) {
1747 spin_unlock(&cifs_file_list_lock);
1750 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1751 if (!any_available && open_file->pid != current->tgid)
1753 if (fsuid_only && !uid_eq(open_file->uid, current_fsuid()))
1755 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
1756 if (!open_file->invalidHandle) {
1757 /* found a good writable file */
1758 cifsFileInfo_get_locked(open_file);
1759 spin_unlock(&cifs_file_list_lock);
1763 inv_file = open_file;
1767 /* couldn't find useable FH with same pid, try any available */
1768 if (!any_available) {
1769 any_available = true;
1770 goto refind_writable;
1774 any_available = false;
1775 cifsFileInfo_get_locked(inv_file);
1778 spin_unlock(&cifs_file_list_lock);
1781 rc = cifs_reopen_file(inv_file, false);
1785 spin_lock(&cifs_file_list_lock);
1786 list_move_tail(&inv_file->flist,
1787 &cifs_inode->openFileList);
1788 spin_unlock(&cifs_file_list_lock);
1789 cifsFileInfo_put(inv_file);
1790 spin_lock(&cifs_file_list_lock);
1793 goto refind_writable;
1800 static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
1802 struct address_space *mapping = page->mapping;
1803 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1806 int bytes_written = 0;
1807 struct inode *inode;
1808 struct cifsFileInfo *open_file;
1810 if (!mapping || !mapping->host)
1813 inode = page->mapping->host;
1815 offset += (loff_t)from;
1816 write_data = kmap(page);
1819 if ((to > PAGE_CACHE_SIZE) || (from > to)) {
1824 /* racing with truncate? */
1825 if (offset > mapping->host->i_size) {
1827 return 0; /* don't care */
1830 /* check to make sure that we are not extending the file */
1831 if (mapping->host->i_size - offset < (loff_t)to)
1832 to = (unsigned)(mapping->host->i_size - offset);
1834 open_file = find_writable_file(CIFS_I(mapping->host), false);
1836 bytes_written = cifs_write(open_file, open_file->pid,
1837 write_data, to - from, &offset);
1838 cifsFileInfo_put(open_file);
1839 /* Does mm or vfs already set times? */
1840 inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
1841 if ((bytes_written > 0) && (offset))
1843 else if (bytes_written < 0)
1846 cifs_dbg(FYI, "No writeable filehandles for inode\n");
1854 static int cifs_writepages(struct address_space *mapping,
1855 struct writeback_control *wbc)
1857 struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb);
1858 bool done = false, scanned = false, range_whole = false;
1860 struct cifs_writedata *wdata;
1861 struct TCP_Server_Info *server;
1866 * If wsize is smaller than the page cache size, default to writing
1867 * one page at a time via cifs_writepage
1869 if (cifs_sb->wsize < PAGE_CACHE_SIZE)
1870 return generic_writepages(mapping, wbc);
1872 if (wbc->range_cyclic) {
1873 index = mapping->writeback_index; /* Start from prev offset */
1876 index = wbc->range_start >> PAGE_CACHE_SHIFT;
1877 end = wbc->range_end >> PAGE_CACHE_SHIFT;
1878 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1883 while (!done && index <= end) {
1884 unsigned int i, nr_pages, found_pages;
1885 pgoff_t next = 0, tofind;
1886 struct page **pages;
1888 tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1,
1891 wdata = cifs_writedata_alloc((unsigned int)tofind,
1892 cifs_writev_complete);
1899 * find_get_pages_tag seems to return a max of 256 on each
1900 * iteration, so we must call it several times in order to
1901 * fill the array or the wsize is effectively limited to
1902 * 256 * PAGE_CACHE_SIZE.
1905 pages = wdata->pages;
1907 nr_pages = find_get_pages_tag(mapping, &index,
1908 PAGECACHE_TAG_DIRTY,
1910 found_pages += nr_pages;
1913 } while (nr_pages && tofind && index <= end);
1915 if (found_pages == 0) {
1916 kref_put(&wdata->refcount, cifs_writedata_release);
1921 for (i = 0; i < found_pages; i++) {
1922 page = wdata->pages[i];
1924 * At this point we hold neither mapping->tree_lock nor
1925 * lock on the page itself: the page may be truncated or
1926 * invalidated (changing page->mapping to NULL), or even
1927 * swizzled back from swapper_space to tmpfs file
1933 else if (!trylock_page(page))
1936 if (unlikely(page->mapping != mapping)) {
1941 if (!wbc->range_cyclic && page->index > end) {
1947 if (next && (page->index != next)) {
1948 /* Not next consecutive page */
1953 if (wbc->sync_mode != WB_SYNC_NONE)
1954 wait_on_page_writeback(page);
1956 if (PageWriteback(page) ||
1957 !clear_page_dirty_for_io(page)) {
1963 * This actually clears the dirty bit in the radix tree.
1964 * See cifs_writepage() for more commentary.
1966 set_page_writeback(page);
1968 if (page_offset(page) >= i_size_read(mapping->host)) {
1971 end_page_writeback(page);
1975 wdata->pages[i] = page;
1976 next = page->index + 1;
1980 /* reset index to refind any pages skipped */
1982 index = wdata->pages[0]->index + 1;
1984 /* put any pages we aren't going to use */
1985 for (i = nr_pages; i < found_pages; i++) {
1986 page_cache_release(wdata->pages[i]);
1987 wdata->pages[i] = NULL;
1990 /* nothing to write? */
1991 if (nr_pages == 0) {
1992 kref_put(&wdata->refcount, cifs_writedata_release);
1996 wdata->sync_mode = wbc->sync_mode;
1997 wdata->nr_pages = nr_pages;
1998 wdata->offset = page_offset(wdata->pages[0]);
1999 wdata->pagesz = PAGE_CACHE_SIZE;
2001 min(i_size_read(mapping->host) -
2002 page_offset(wdata->pages[nr_pages - 1]),
2003 (loff_t)PAGE_CACHE_SIZE);
2004 wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) +
2008 if (wdata->cfile != NULL)
2009 cifsFileInfo_put(wdata->cfile);
2010 wdata->cfile = find_writable_file(CIFS_I(mapping->host),
2012 if (!wdata->cfile) {
2013 cifs_dbg(VFS, "No writable handles for inode\n");
2017 wdata->pid = wdata->cfile->pid;
2018 server = tlink_tcon(wdata->cfile->tlink)->ses->server;
2019 rc = server->ops->async_writev(wdata);
2020 } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN);
2022 for (i = 0; i < nr_pages; ++i)
2023 unlock_page(wdata->pages[i]);
2025 /* send failure -- clean up the mess */
2027 for (i = 0; i < nr_pages; ++i) {
2029 redirty_page_for_writepage(wbc,
2032 SetPageError(wdata->pages[i]);
2033 end_page_writeback(wdata->pages[i]);
2034 page_cache_release(wdata->pages[i]);
2037 mapping_set_error(mapping, rc);
2039 kref_put(&wdata->refcount, cifs_writedata_release);
2041 wbc->nr_to_write -= nr_pages;
2042 if (wbc->nr_to_write <= 0)
2048 if (!scanned && !done) {
2050 * We hit the last page and there is more work to be done: wrap
2051 * back to the start of the file
2058 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
2059 mapping->writeback_index = index;
2065 cifs_writepage_locked(struct page *page, struct writeback_control *wbc)
2071 /* BB add check for wbc flags */
2072 page_cache_get(page);
2073 if (!PageUptodate(page))
2074 cifs_dbg(FYI, "ppw - page not up to date\n");
2077 * Set the "writeback" flag, and clear "dirty" in the radix tree.
2079 * A writepage() implementation always needs to do either this,
2080 * or re-dirty the page with "redirty_page_for_writepage()" in
2081 * the case of a failure.
2083 * Just unlocking the page will cause the radix tree tag-bits
2084 * to fail to update with the state of the page correctly.
2086 set_page_writeback(page);
2088 rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
2089 if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL)
2091 else if (rc == -EAGAIN)
2092 redirty_page_for_writepage(wbc, page);
2096 SetPageUptodate(page);
2097 end_page_writeback(page);
2098 page_cache_release(page);
2103 static int cifs_writepage(struct page *page, struct writeback_control *wbc)
2105 int rc = cifs_writepage_locked(page, wbc);
2110 static int cifs_write_end(struct file *file, struct address_space *mapping,
2111 loff_t pos, unsigned len, unsigned copied,
2112 struct page *page, void *fsdata)
2115 struct inode *inode = mapping->host;
2116 struct cifsFileInfo *cfile = file->private_data;
2117 struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
2120 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2123 pid = current->tgid;
2125 cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n",
2128 if (PageChecked(page)) {
2130 SetPageUptodate(page);
2131 ClearPageChecked(page);
2132 } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
2133 SetPageUptodate(page);
2135 if (!PageUptodate(page)) {
2137 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
2141 /* this is probably better than directly calling
2142 partialpage_write since in this function the file handle is
2143 known which we might as well leverage */
2144 /* BB check if anything else missing out of ppw
2145 such as updating last write time */
2146 page_data = kmap(page);
2147 rc = cifs_write(cfile, pid, page_data + offset, copied, &pos);
2148 /* if (rc < 0) should we set writebehind rc? */
2155 set_page_dirty(page);
2159 spin_lock(&inode->i_lock);
2160 if (pos > inode->i_size)
2161 i_size_write(inode, pos);
2162 spin_unlock(&inode->i_lock);
2166 page_cache_release(page);
2171 int cifs_strict_fsync(struct file *file, loff_t start, loff_t end,
2176 struct cifs_tcon *tcon;
2177 struct TCP_Server_Info *server;
2178 struct cifsFileInfo *smbfile = file->private_data;
2179 struct inode *inode = file_inode(file);
2180 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2182 rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
2185 mutex_lock(&inode->i_mutex);
2189 cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n",
2190 file->f_path.dentry->d_name.name, datasync);
2192 if (!CIFS_I(inode)->clientCanCacheRead) {
2193 rc = cifs_invalidate_mapping(inode);
2195 cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc);
2196 rc = 0; /* don't care about it in fsync */
2200 tcon = tlink_tcon(smbfile->tlink);
2201 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2202 server = tcon->ses->server;
2203 if (server->ops->flush)
2204 rc = server->ops->flush(xid, tcon, &smbfile->fid);
2210 mutex_unlock(&inode->i_mutex);
2214 int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
2218 struct cifs_tcon *tcon;
2219 struct TCP_Server_Info *server;
2220 struct cifsFileInfo *smbfile = file->private_data;
2221 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2222 struct inode *inode = file->f_mapping->host;
2224 rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
2227 mutex_lock(&inode->i_mutex);
2231 cifs_dbg(FYI, "Sync file - name: %s datasync: 0x%x\n",
2232 file->f_path.dentry->d_name.name, datasync);
2234 tcon = tlink_tcon(smbfile->tlink);
2235 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2236 server = tcon->ses->server;
2237 if (server->ops->flush)
2238 rc = server->ops->flush(xid, tcon, &smbfile->fid);
2244 mutex_unlock(&inode->i_mutex);
2249 * As file closes, flush all cached write data for this inode checking
2250 * for write behind errors.
2252 int cifs_flush(struct file *file, fl_owner_t id)
2254 struct inode *inode = file_inode(file);
2257 if (file->f_mode & FMODE_WRITE)
2258 rc = filemap_write_and_wait(inode->i_mapping);
2260 cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc);
2266 cifs_write_allocate_pages(struct page **pages, unsigned long num_pages)
2271 for (i = 0; i < num_pages; i++) {
2272 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2275 * save number of pages we have already allocated and
2276 * return with ENOMEM error
2285 for (i = 0; i < num_pages; i++)
2292 size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len)
2297 clen = min_t(const size_t, len, wsize);
2298 num_pages = DIV_ROUND_UP(clen, PAGE_SIZE);
2307 cifs_uncached_writev_complete(struct work_struct *work)
2310 struct cifs_writedata *wdata = container_of(work,
2311 struct cifs_writedata, work);
2312 struct inode *inode = wdata->cfile->dentry->d_inode;
2313 struct cifsInodeInfo *cifsi = CIFS_I(inode);
2315 spin_lock(&inode->i_lock);
2316 cifs_update_eof(cifsi, wdata->offset, wdata->bytes);
2317 if (cifsi->server_eof > inode->i_size)
2318 i_size_write(inode, cifsi->server_eof);
2319 spin_unlock(&inode->i_lock);
2321 complete(&wdata->done);
2323 if (wdata->result != -EAGAIN) {
2324 for (i = 0; i < wdata->nr_pages; i++)
2325 put_page(wdata->pages[i]);
2328 kref_put(&wdata->refcount, cifs_writedata_release);
2331 /* attempt to send write to server, retry on any -EAGAIN errors */
2333 cifs_uncached_retry_writev(struct cifs_writedata *wdata)
2336 struct TCP_Server_Info *server;
2338 server = tlink_tcon(wdata->cfile->tlink)->ses->server;
2341 if (wdata->cfile->invalidHandle) {
2342 rc = cifs_reopen_file(wdata->cfile, false);
2346 rc = server->ops->async_writev(wdata);
2347 } while (rc == -EAGAIN);
2353 cifs_iovec_write(struct file *file, const struct iovec *iov,
2354 unsigned long nr_segs, loff_t *poffset)
2356 unsigned long nr_pages, i;
2357 size_t bytes, copied, len, cur_len;
2358 ssize_t total_written = 0;
2361 struct cifsFileInfo *open_file;
2362 struct cifs_tcon *tcon;
2363 struct cifs_sb_info *cifs_sb;
2364 struct cifs_writedata *wdata, *tmp;
2365 struct list_head wdata_list;
2369 len = iov_length(iov, nr_segs);
2373 rc = generic_write_checks(file, poffset, &len, 0);
2377 INIT_LIST_HEAD(&wdata_list);
2378 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2379 open_file = file->private_data;
2380 tcon = tlink_tcon(open_file->tlink);
2382 if (!tcon->ses->server->ops->async_writev)
2387 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2388 pid = open_file->pid;
2390 pid = current->tgid;
2392 iov_iter_init(&it, iov, nr_segs, len, 0);
2396 nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len);
2397 wdata = cifs_writedata_alloc(nr_pages,
2398 cifs_uncached_writev_complete);
2404 rc = cifs_write_allocate_pages(wdata->pages, nr_pages);
2411 for (i = 0; i < nr_pages; i++) {
2412 bytes = min_t(const size_t, cur_len, PAGE_SIZE);
2413 copied = iov_iter_copy_from_user(wdata->pages[i], &it,
2416 iov_iter_advance(&it, copied);
2418 * If we didn't copy as much as we expected, then that
2419 * may mean we trod into an unmapped area. Stop copying
2420 * at that point. On the next pass through the big
2421 * loop, we'll likely end up getting a zero-length
2422 * write and bailing out of it.
2427 cur_len = save_len - cur_len;
2430 * If we have no data to send, then that probably means that
2431 * the copy above failed altogether. That's most likely because
2432 * the address in the iovec was bogus. Set the rc to -EFAULT,
2433 * free anything we allocated and bail out.
2436 for (i = 0; i < nr_pages; i++)
2437 put_page(wdata->pages[i]);
2444 * i + 1 now represents the number of pages we actually used in
2445 * the copy phase above. Bring nr_pages down to that, and free
2446 * any pages that we didn't use.
2448 for ( ; nr_pages > i + 1; nr_pages--)
2449 put_page(wdata->pages[nr_pages - 1]);
2451 wdata->sync_mode = WB_SYNC_ALL;
2452 wdata->nr_pages = nr_pages;
2453 wdata->offset = (__u64)offset;
2454 wdata->cfile = cifsFileInfo_get(open_file);
2456 wdata->bytes = cur_len;
2457 wdata->pagesz = PAGE_SIZE;
2458 wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE);
2459 rc = cifs_uncached_retry_writev(wdata);
2461 kref_put(&wdata->refcount, cifs_writedata_release);
2465 list_add_tail(&wdata->list, &wdata_list);
2471 * If at least one write was successfully sent, then discard any rc
2472 * value from the later writes. If the other write succeeds, then
2473 * we'll end up returning whatever was written. If it fails, then
2474 * we'll get a new rc value from that.
2476 if (!list_empty(&wdata_list))
2480 * Wait for and collect replies for any successful sends in order of
2481 * increasing offset. Once an error is hit or we get a fatal signal
2482 * while waiting, then return without waiting for any more replies.
2485 list_for_each_entry_safe(wdata, tmp, &wdata_list, list) {
2487 /* FIXME: freezable too? */
2488 rc = wait_for_completion_killable(&wdata->done);
2491 else if (wdata->result)
2494 total_written += wdata->bytes;
2496 /* resend call if it's a retryable error */
2497 if (rc == -EAGAIN) {
2498 rc = cifs_uncached_retry_writev(wdata);
2502 list_del_init(&wdata->list);
2503 kref_put(&wdata->refcount, cifs_writedata_release);
2506 if (total_written > 0)
2507 *poffset += total_written;
2509 cifs_stats_bytes_written(tcon, total_written);
2510 return total_written ? total_written : (ssize_t)rc;
2513 ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov,
2514 unsigned long nr_segs, loff_t pos)
2517 struct inode *inode;
2519 inode = file_inode(iocb->ki_filp);
2522 * BB - optimize the way when signing is disabled. We can drop this
2523 * extra memory-to-memory copying and use iovec buffers for constructing
2527 written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos);
2529 CIFS_I(inode)->invalid_mapping = true;
2537 cifs_writev(struct kiocb *iocb, const struct iovec *iov,
2538 unsigned long nr_segs, loff_t pos)
2540 struct file *file = iocb->ki_filp;
2541 struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
2542 struct inode *inode = file->f_mapping->host;
2543 struct cifsInodeInfo *cinode = CIFS_I(inode);
2544 struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
2545 ssize_t rc = -EACCES;
2547 BUG_ON(iocb->ki_pos != pos);
2550 * We need to hold the sem to be sure nobody modifies lock list
2551 * with a brlock that prevents writing.
2553 down_read(&cinode->lock_sem);
2554 if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs),
2555 server->vals->exclusive_lock_type, NULL,
2557 mutex_lock(&inode->i_mutex);
2558 rc = __generic_file_aio_write(iocb, iov, nr_segs,
2560 mutex_unlock(&inode->i_mutex);
2563 if (rc > 0 || rc == -EIOCBQUEUED) {
2566 err = generic_write_sync(file, pos, rc);
2567 if (err < 0 && rc > 0)
2571 up_read(&cinode->lock_sem);
2576 cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov,
2577 unsigned long nr_segs, loff_t pos)
2579 struct inode *inode = file_inode(iocb->ki_filp);
2580 struct cifsInodeInfo *cinode = CIFS_I(inode);
2581 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2582 struct cifsFileInfo *cfile = (struct cifsFileInfo *)
2583 iocb->ki_filp->private_data;
2584 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
2587 if (cinode->clientCanCacheAll) {
2588 if (cap_unix(tcon->ses) &&
2589 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability))
2590 && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
2591 return generic_file_aio_write(iocb, iov, nr_segs, pos);
2592 return cifs_writev(iocb, iov, nr_segs, pos);
2595 * For non-oplocked files in strict cache mode we need to write the data
2596 * to the server exactly from the pos to pos+len-1 rather than flush all
2597 * affected pages because it may cause a error with mandatory locks on
2598 * these pages but not on the region from pos to ppos+len-1.
2600 written = cifs_user_writev(iocb, iov, nr_segs, pos);
2601 if (written > 0 && cinode->clientCanCacheRead) {
2603 * Windows 7 server can delay breaking level2 oplock if a write
2604 * request comes - break it on the client to prevent reading
2607 cifs_invalidate_mapping(inode);
2608 cifs_dbg(FYI, "Set no oplock for inode=%p after a write operation\n",
2610 cinode->clientCanCacheRead = false;
2615 static struct cifs_readdata *
2616 cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete)
2618 struct cifs_readdata *rdata;
2620 rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages),
2622 if (rdata != NULL) {
2623 kref_init(&rdata->refcount);
2624 INIT_LIST_HEAD(&rdata->list);
2625 init_completion(&rdata->done);
2626 INIT_WORK(&rdata->work, complete);
2633 cifs_readdata_release(struct kref *refcount)
2635 struct cifs_readdata *rdata = container_of(refcount,
2636 struct cifs_readdata, refcount);
2639 cifsFileInfo_put(rdata->cfile);
2645 cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages)
2651 for (i = 0; i < nr_pages; i++) {
2652 page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2657 rdata->pages[i] = page;
2661 for (i = 0; i < nr_pages; i++) {
2662 put_page(rdata->pages[i]);
2663 rdata->pages[i] = NULL;
2670 cifs_uncached_readdata_release(struct kref *refcount)
2672 struct cifs_readdata *rdata = container_of(refcount,
2673 struct cifs_readdata, refcount);
2676 for (i = 0; i < rdata->nr_pages; i++) {
2677 put_page(rdata->pages[i]);
2678 rdata->pages[i] = NULL;
2680 cifs_readdata_release(refcount);
2684 cifs_retry_async_readv(struct cifs_readdata *rdata)
2687 struct TCP_Server_Info *server;
2689 server = tlink_tcon(rdata->cfile->tlink)->ses->server;
2692 if (rdata->cfile->invalidHandle) {
2693 rc = cifs_reopen_file(rdata->cfile, true);
2697 rc = server->ops->async_readv(rdata);
2698 } while (rc == -EAGAIN);
2704 * cifs_readdata_to_iov - copy data from pages in response to an iovec
2705 * @rdata: the readdata response with list of pages holding data
2706 * @iov: vector in which we should copy the data
2707 * @nr_segs: number of segments in vector
2708 * @offset: offset into file of the first iovec
2709 * @copied: used to return the amount of data copied to the iov
2711 * This function copies data from a list of pages in a readdata response into
2712 * an array of iovecs. It will first calculate where the data should go
2713 * based on the info in the readdata and then copy the data into that spot.
2716 cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov,
2717 unsigned long nr_segs, loff_t offset, ssize_t *copied)
2721 size_t pos = rdata->offset - offset;
2722 ssize_t remaining = rdata->bytes;
2723 unsigned char *pdata;
2726 /* set up iov_iter and advance to the correct offset */
2727 iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0);
2728 iov_iter_advance(&ii, pos);
2731 for (i = 0; i < rdata->nr_pages; i++) {
2733 struct page *page = rdata->pages[i];
2735 /* copy a whole page or whatever's left */
2736 copy = min_t(ssize_t, remaining, PAGE_SIZE);
2738 /* ...but limit it to whatever space is left in the iov */
2739 copy = min_t(ssize_t, copy, iov_iter_count(&ii));
2741 /* go while there's data to be copied and no errors */
2744 rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset,
2750 iov_iter_advance(&ii, copy);
2759 cifs_uncached_readv_complete(struct work_struct *work)
2761 struct cifs_readdata *rdata = container_of(work,
2762 struct cifs_readdata, work);
2764 complete(&rdata->done);
2765 kref_put(&rdata->refcount, cifs_uncached_readdata_release);
2769 cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
2770 struct cifs_readdata *rdata, unsigned int len)
2772 int total_read = 0, result = 0;
2774 unsigned int nr_pages = rdata->nr_pages;
2777 rdata->tailsz = PAGE_SIZE;
2778 for (i = 0; i < nr_pages; i++) {
2779 struct page *page = rdata->pages[i];
2781 if (len >= PAGE_SIZE) {
2782 /* enough data to fill the page */
2783 iov.iov_base = kmap(page);
2784 iov.iov_len = PAGE_SIZE;
2785 cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n",
2786 i, iov.iov_base, iov.iov_len);
2788 } else if (len > 0) {
2789 /* enough for partial page, fill and zero the rest */
2790 iov.iov_base = kmap(page);
2792 cifs_dbg(FYI, "%u: iov_base=%p iov_len=%zu\n",
2793 i, iov.iov_base, iov.iov_len);
2794 memset(iov.iov_base + len, '\0', PAGE_SIZE - len);
2795 rdata->tailsz = len;
2798 /* no need to hold page hostage */
2799 rdata->pages[i] = NULL;
2805 result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len);
2810 total_read += result;
2813 return total_read > 0 && result != -EAGAIN ? total_read : result;
2817 cifs_iovec_read(struct file *file, const struct iovec *iov,
2818 unsigned long nr_segs, loff_t *poffset)
2821 size_t len, cur_len;
2822 ssize_t total_read = 0;
2823 loff_t offset = *poffset;
2824 unsigned int npages;
2825 struct cifs_sb_info *cifs_sb;
2826 struct cifs_tcon *tcon;
2827 struct cifsFileInfo *open_file;
2828 struct cifs_readdata *rdata, *tmp;
2829 struct list_head rdata_list;
2835 len = iov_length(iov, nr_segs);
2839 INIT_LIST_HEAD(&rdata_list);
2840 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
2841 open_file = file->private_data;
2842 tcon = tlink_tcon(open_file->tlink);
2844 if (!tcon->ses->server->ops->async_readv)
2847 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
2848 pid = open_file->pid;
2850 pid = current->tgid;
2852 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
2853 cifs_dbg(FYI, "attempting read on write only file instance\n");
2856 cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize);
2857 npages = DIV_ROUND_UP(cur_len, PAGE_SIZE);
2859 /* allocate a readdata struct */
2860 rdata = cifs_readdata_alloc(npages,
2861 cifs_uncached_readv_complete);
2867 rc = cifs_read_allocate_pages(rdata, npages);
2871 rdata->cfile = cifsFileInfo_get(open_file);
2872 rdata->nr_pages = npages;
2873 rdata->offset = offset;
2874 rdata->bytes = cur_len;
2876 rdata->pagesz = PAGE_SIZE;
2877 rdata->read_into_pages = cifs_uncached_read_into_pages;
2879 rc = cifs_retry_async_readv(rdata);
2882 kref_put(&rdata->refcount,
2883 cifs_uncached_readdata_release);
2887 list_add_tail(&rdata->list, &rdata_list);
2892 /* if at least one read request send succeeded, then reset rc */
2893 if (!list_empty(&rdata_list))
2896 /* the loop below should proceed in the order of increasing offsets */
2898 list_for_each_entry_safe(rdata, tmp, &rdata_list, list) {
2902 /* FIXME: freezable sleep too? */
2903 rc = wait_for_completion_killable(&rdata->done);
2906 else if (rdata->result)
2909 rc = cifs_readdata_to_iov(rdata, iov,
2912 total_read += copied;
2915 /* resend call if it's a retryable error */
2916 if (rc == -EAGAIN) {
2917 rc = cifs_retry_async_readv(rdata);
2921 list_del_init(&rdata->list);
2922 kref_put(&rdata->refcount, cifs_uncached_readdata_release);
2925 cifs_stats_bytes_read(tcon, total_read);
2926 *poffset += total_read;
2928 /* mask nodata case */
2932 return total_read ? total_read : rc;
2935 ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov,
2936 unsigned long nr_segs, loff_t pos)
2940 read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos);
2948 cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov,
2949 unsigned long nr_segs, loff_t pos)
2951 struct inode *inode = file_inode(iocb->ki_filp);
2952 struct cifsInodeInfo *cinode = CIFS_I(inode);
2953 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2954 struct cifsFileInfo *cfile = (struct cifsFileInfo *)
2955 iocb->ki_filp->private_data;
2956 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
2960 * In strict cache mode we need to read from the server all the time
2961 * if we don't have level II oplock because the server can delay mtime
2962 * change - so we can't make a decision about inode invalidating.
2963 * And we can also fail with pagereading if there are mandatory locks
2964 * on pages affected by this read but not on the region from pos to
2967 if (!cinode->clientCanCacheRead)
2968 return cifs_user_readv(iocb, iov, nr_segs, pos);
2970 if (cap_unix(tcon->ses) &&
2971 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
2972 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
2973 return generic_file_aio_read(iocb, iov, nr_segs, pos);
2976 * We need to hold the sem to be sure nobody modifies lock list
2977 * with a brlock that prevents reading.
2979 down_read(&cinode->lock_sem);
2980 if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs),
2981 tcon->ses->server->vals->shared_lock_type,
2982 NULL, CIFS_READ_OP))
2983 rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
2984 up_read(&cinode->lock_sem);
2989 cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset)
2992 unsigned int bytes_read = 0;
2993 unsigned int total_read;
2994 unsigned int current_read_size;
2996 struct cifs_sb_info *cifs_sb;
2997 struct cifs_tcon *tcon;
2998 struct TCP_Server_Info *server;
3001 struct cifsFileInfo *open_file;
3002 struct cifs_io_parms io_parms;
3003 int buf_type = CIFS_NO_BUFFER;
3007 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
3009 /* FIXME: set up handlers for larger reads and/or convert to async */
3010 rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize);
3012 if (file->private_data == NULL) {
3017 open_file = file->private_data;
3018 tcon = tlink_tcon(open_file->tlink);
3019 server = tcon->ses->server;
3021 if (!server->ops->sync_read) {
3026 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
3027 pid = open_file->pid;
3029 pid = current->tgid;
3031 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
3032 cifs_dbg(FYI, "attempting read on write only file instance\n");
3034 for (total_read = 0, cur_offset = read_data; read_size > total_read;
3035 total_read += bytes_read, cur_offset += bytes_read) {
3036 current_read_size = min_t(uint, read_size - total_read, rsize);
3038 * For windows me and 9x we do not want to request more than it
3039 * negotiated since it will refuse the read then.
3041 if ((tcon->ses) && !(tcon->ses->capabilities &
3042 tcon->ses->server->vals->cap_large_files)) {
3043 current_read_size = min_t(uint, current_read_size,
3047 while (rc == -EAGAIN) {
3048 if (open_file->invalidHandle) {
3049 rc = cifs_reopen_file(open_file, true);
3054 io_parms.tcon = tcon;
3055 io_parms.offset = *offset;
3056 io_parms.length = current_read_size;
3057 rc = server->ops->sync_read(xid, open_file, &io_parms,
3058 &bytes_read, &cur_offset,
3061 if (rc || (bytes_read == 0)) {
3069 cifs_stats_bytes_read(tcon, total_read);
3070 *offset += bytes_read;
3078 * If the page is mmap'ed into a process' page tables, then we need to make
3079 * sure that it doesn't change while being written back.
3082 cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
3084 struct page *page = vmf->page;
3087 return VM_FAULT_LOCKED;
3090 static struct vm_operations_struct cifs_file_vm_ops = {
3091 .fault = filemap_fault,
3092 .page_mkwrite = cifs_page_mkwrite,
3093 .remap_pages = generic_file_remap_pages,
3096 int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma)
3099 struct inode *inode = file_inode(file);
3103 if (!CIFS_I(inode)->clientCanCacheRead) {
3104 rc = cifs_invalidate_mapping(inode);
3109 rc = generic_file_mmap(file, vma);
3111 vma->vm_ops = &cifs_file_vm_ops;
3116 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
3121 rc = cifs_revalidate_file(file);
3123 cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n",
3128 rc = generic_file_mmap(file, vma);
3130 vma->vm_ops = &cifs_file_vm_ops;
3136 cifs_readv_complete(struct work_struct *work)
3139 struct cifs_readdata *rdata = container_of(work,
3140 struct cifs_readdata, work);
3142 for (i = 0; i < rdata->nr_pages; i++) {
3143 struct page *page = rdata->pages[i];
3145 lru_cache_add_file(page);
3147 if (rdata->result == 0) {
3148 flush_dcache_page(page);
3149 SetPageUptodate(page);
3154 if (rdata->result == 0)
3155 cifs_readpage_to_fscache(rdata->mapping->host, page);
3157 page_cache_release(page);
3158 rdata->pages[i] = NULL;
3160 kref_put(&rdata->refcount, cifs_readdata_release);
3164 cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
3165 struct cifs_readdata *rdata, unsigned int len)
3167 int total_read = 0, result = 0;
3171 unsigned int nr_pages = rdata->nr_pages;
3174 /* determine the eof that the server (probably) has */
3175 eof = CIFS_I(rdata->mapping->host)->server_eof;
3176 eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0;
3177 cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index);
3179 rdata->tailsz = PAGE_CACHE_SIZE;
3180 for (i = 0; i < nr_pages; i++) {
3181 struct page *page = rdata->pages[i];
3183 if (len >= PAGE_CACHE_SIZE) {
3184 /* enough data to fill the page */
3185 iov.iov_base = kmap(page);
3186 iov.iov_len = PAGE_CACHE_SIZE;
3187 cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n",
3188 i, page->index, iov.iov_base, iov.iov_len);
3189 len -= PAGE_CACHE_SIZE;
3190 } else if (len > 0) {
3191 /* enough for partial page, fill and zero the rest */
3192 iov.iov_base = kmap(page);
3194 cifs_dbg(FYI, "%u: idx=%lu iov_base=%p iov_len=%zu\n",
3195 i, page->index, iov.iov_base, iov.iov_len);
3196 memset(iov.iov_base + len,
3197 '\0', PAGE_CACHE_SIZE - len);
3198 rdata->tailsz = len;
3200 } else if (page->index > eof_index) {
3202 * The VFS will not try to do readahead past the
3203 * i_size, but it's possible that we have outstanding
3204 * writes with gaps in the middle and the i_size hasn't
3205 * caught up yet. Populate those with zeroed out pages
3206 * to prevent the VFS from repeatedly attempting to
3207 * fill them until the writes are flushed.
3209 zero_user(page, 0, PAGE_CACHE_SIZE);
3210 lru_cache_add_file(page);
3211 flush_dcache_page(page);
3212 SetPageUptodate(page);
3214 page_cache_release(page);
3215 rdata->pages[i] = NULL;
3219 /* no need to hold page hostage */
3220 lru_cache_add_file(page);
3222 page_cache_release(page);
3223 rdata->pages[i] = NULL;
3228 result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len);
3233 total_read += result;
3236 return total_read > 0 && result != -EAGAIN ? total_read : result;
3239 static int cifs_readpages(struct file *file, struct address_space *mapping,
3240 struct list_head *page_list, unsigned num_pages)
3243 struct list_head tmplist;
3244 struct cifsFileInfo *open_file = file->private_data;
3245 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
3246 unsigned int rsize = cifs_sb->rsize;
3250 * Give up immediately if rsize is too small to read an entire page.
3251 * The VFS will fall back to readpage. We should never reach this
3252 * point however since we set ra_pages to 0 when the rsize is smaller
3253 * than a cache page.
3255 if (unlikely(rsize < PAGE_CACHE_SIZE))
3259 * Reads as many pages as possible from fscache. Returns -ENOBUFS
3260 * immediately if the cookie is negative
3262 rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
3267 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
3268 pid = open_file->pid;
3270 pid = current->tgid;
3273 INIT_LIST_HEAD(&tmplist);
3275 cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n",
3276 __func__, file, mapping, num_pages);
3279 * Start with the page at end of list and move it to private
3280 * list. Do the same with any following pages until we hit
3281 * the rsize limit, hit an index discontinuity, or run out of
3282 * pages. Issue the async read and then start the loop again
3283 * until the list is empty.
3285 * Note that list order is important. The page_list is in
3286 * the order of declining indexes. When we put the pages in
3287 * the rdata->pages, then we want them in increasing order.
3289 while (!list_empty(page_list)) {
3291 unsigned int bytes = PAGE_CACHE_SIZE;
3292 unsigned int expected_index;
3293 unsigned int nr_pages = 1;
3295 struct page *page, *tpage;
3296 struct cifs_readdata *rdata;
3298 page = list_entry(page_list->prev, struct page, lru);
3301 * Lock the page and put it in the cache. Since no one else
3302 * should have access to this page, we're safe to simply set
3303 * PG_locked without checking it first.
3305 __set_page_locked(page);
3306 rc = add_to_page_cache_locked(page, mapping,
3307 page->index, GFP_KERNEL);
3309 /* give up if we can't stick it in the cache */
3311 __clear_page_locked(page);
3315 /* move first page to the tmplist */
3316 offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
3317 list_move_tail(&page->lru, &tmplist);
3319 /* now try and add more pages onto the request */
3320 expected_index = page->index + 1;
3321 list_for_each_entry_safe_reverse(page, tpage, page_list, lru) {
3322 /* discontinuity ? */
3323 if (page->index != expected_index)
3326 /* would this page push the read over the rsize? */
3327 if (bytes + PAGE_CACHE_SIZE > rsize)
3330 __set_page_locked(page);
3331 if (add_to_page_cache_locked(page, mapping,
3332 page->index, GFP_KERNEL)) {
3333 __clear_page_locked(page);
3336 list_move_tail(&page->lru, &tmplist);
3337 bytes += PAGE_CACHE_SIZE;
3342 rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete);
3344 /* best to give up if we're out of mem */
3345 list_for_each_entry_safe(page, tpage, &tmplist, lru) {
3346 list_del(&page->lru);
3347 lru_cache_add_file(page);
3349 page_cache_release(page);
3355 rdata->cfile = cifsFileInfo_get(open_file);
3356 rdata->mapping = mapping;
3357 rdata->offset = offset;
3358 rdata->bytes = bytes;
3360 rdata->pagesz = PAGE_CACHE_SIZE;
3361 rdata->read_into_pages = cifs_readpages_read_into_pages;
3363 list_for_each_entry_safe(page, tpage, &tmplist, lru) {
3364 list_del(&page->lru);
3365 rdata->pages[rdata->nr_pages++] = page;
3368 rc = cifs_retry_async_readv(rdata);
3370 for (i = 0; i < rdata->nr_pages; i++) {
3371 page = rdata->pages[i];
3372 lru_cache_add_file(page);
3374 page_cache_release(page);
3376 kref_put(&rdata->refcount, cifs_readdata_release);
3380 kref_put(&rdata->refcount, cifs_readdata_release);
3386 static int cifs_readpage_worker(struct file *file, struct page *page,
3392 /* Is the page cached? */
3393 rc = cifs_readpage_from_fscache(file_inode(file), page);
3397 page_cache_get(page);
3398 read_data = kmap(page);
3399 /* for reads over a certain size could initiate async read ahead */
3401 rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
3406 cifs_dbg(FYI, "Bytes read %d\n", rc);
3408 file_inode(file)->i_atime =
3409 current_fs_time(file_inode(file)->i_sb);
3411 if (PAGE_CACHE_SIZE > rc)
3412 memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
3414 flush_dcache_page(page);
3415 SetPageUptodate(page);
3417 /* send this page to the cache */
3418 cifs_readpage_to_fscache(file_inode(file), page);
3424 page_cache_release(page);
3430 static int cifs_readpage(struct file *file, struct page *page)
3432 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
3438 if (file->private_data == NULL) {
3444 cifs_dbg(FYI, "readpage %p at offset %d 0x%x\n",
3445 page, (int)offset, (int)offset);
3447 rc = cifs_readpage_worker(file, page, &offset);
3455 static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
3457 struct cifsFileInfo *open_file;
3459 spin_lock(&cifs_file_list_lock);
3460 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
3461 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
3462 spin_unlock(&cifs_file_list_lock);
3466 spin_unlock(&cifs_file_list_lock);
3470 /* We do not want to update the file size from server for inodes
3471 open for write - to avoid races with writepage extending
3472 the file - in the future we could consider allowing
3473 refreshing the inode only on increases in the file size
3474 but this is tricky to do without racing with writebehind
3475 page caching in the current Linux kernel design */
3476 bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
3481 if (is_inode_writable(cifsInode)) {
3482 /* This inode is open for write at least once */
3483 struct cifs_sb_info *cifs_sb;
3485 cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
3486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
3487 /* since no page cache to corrupt on directio
3488 we can change size safely */
3492 if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
3500 static int cifs_write_begin(struct file *file, struct address_space *mapping,
3501 loff_t pos, unsigned len, unsigned flags,
3502 struct page **pagep, void **fsdata)
3504 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
3505 loff_t offset = pos & (PAGE_CACHE_SIZE - 1);
3506 loff_t page_start = pos & PAGE_MASK;
3511 cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len);
3513 page = grab_cache_page_write_begin(mapping, index, flags);
3519 if (PageUptodate(page))
3523 * If we write a full page it will be up to date, no need to read from
3524 * the server. If the write is short, we'll end up doing a sync write
3527 if (len == PAGE_CACHE_SIZE)
3531 * optimize away the read when we have an oplock, and we're not
3532 * expecting to use any of the data we'd be reading in. That
3533 * is, when the page lies beyond the EOF, or straddles the EOF
3534 * and the write will cover all of the existing data.
3536 if (CIFS_I(mapping->host)->clientCanCacheRead) {
3537 i_size = i_size_read(mapping->host);
3538 if (page_start >= i_size ||
3539 (offset == 0 && (pos + len) >= i_size)) {
3540 zero_user_segments(page, 0, offset,
3544 * PageChecked means that the parts of the page
3545 * to which we're not writing are considered up
3546 * to date. Once the data is copied to the
3547 * page, it can be set uptodate.
3549 SetPageChecked(page);
3554 if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
3556 * might as well read a page, it is fast enough. If we get
3557 * an error, we don't need to return it. cifs_write_end will
3558 * do a sync write instead since PG_uptodate isn't set.
3560 cifs_readpage_worker(file, page, &page_start);
3562 /* we could try using another file handle if there is one -
3563 but how would we lock it to prevent close of that handle
3564 racing with this read? In any case
3565 this will be written out by write_end so is fine */
3572 static int cifs_release_page(struct page *page, gfp_t gfp)
3574 if (PagePrivate(page))
3577 return cifs_fscache_release_page(page, gfp);
3580 static void cifs_invalidate_page(struct page *page, unsigned long offset)
3582 struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
3585 cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
3588 static int cifs_launder_page(struct page *page)
3591 loff_t range_start = page_offset(page);
3592 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
3593 struct writeback_control wbc = {
3594 .sync_mode = WB_SYNC_ALL,
3596 .range_start = range_start,
3597 .range_end = range_end,
3600 cifs_dbg(FYI, "Launder page: %p\n", page);
3602 if (clear_page_dirty_for_io(page))
3603 rc = cifs_writepage_locked(page, &wbc);
3605 cifs_fscache_invalidate_page(page, page->mapping->host);
3609 void cifs_oplock_break(struct work_struct *work)
3611 struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
3613 struct inode *inode = cfile->dentry->d_inode;
3614 struct cifsInodeInfo *cinode = CIFS_I(inode);
3615 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
3618 if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead &&
3619 cifs_has_mand_locks(cinode)) {
3620 cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n",
3622 cinode->clientCanCacheRead = false;
3625 if (inode && S_ISREG(inode->i_mode)) {
3626 if (cinode->clientCanCacheRead)
3627 break_lease(inode, O_RDONLY);
3629 break_lease(inode, O_WRONLY);
3630 rc = filemap_fdatawrite(inode->i_mapping);
3631 if (cinode->clientCanCacheRead == 0) {
3632 rc = filemap_fdatawait(inode->i_mapping);
3633 mapping_set_error(inode->i_mapping, rc);
3634 cifs_invalidate_mapping(inode);
3636 cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc);
3639 rc = cifs_push_locks(cfile);
3641 cifs_dbg(VFS, "Push locks rc = %d\n", rc);
3644 * releasing stale oplock after recent reconnect of smb session using
3645 * a now incorrect file handle is not a data integrity issue but do
3646 * not bother sending an oplock release if session to server still is
3647 * disconnected since oplock already released by the server
3649 if (!cfile->oplock_break_cancelled) {
3650 rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid,
3652 cifs_dbg(FYI, "Oplock release rc = %d\n", rc);
3656 const struct address_space_operations cifs_addr_ops = {
3657 .readpage = cifs_readpage,
3658 .readpages = cifs_readpages,
3659 .writepage = cifs_writepage,
3660 .writepages = cifs_writepages,
3661 .write_begin = cifs_write_begin,
3662 .write_end = cifs_write_end,
3663 .set_page_dirty = __set_page_dirty_nobuffers,
3664 .releasepage = cifs_release_page,
3665 .invalidatepage = cifs_invalidate_page,
3666 .launder_page = cifs_launder_page,
3670 * cifs_readpages requires the server to support a buffer large enough to
3671 * contain the header plus one complete page of data. Otherwise, we need
3672 * to leave cifs_readpages out of the address space operations.
3674 const struct address_space_operations cifs_addr_ops_smallbuf = {
3675 .readpage = cifs_readpage,
3676 .writepage = cifs_writepage,
3677 .writepages = cifs_writepages,
3678 .write_begin = cifs_write_begin,
3679 .write_end = cifs_write_end,
3680 .set_page_dirty = __set_page_dirty_nobuffers,
3681 .releasepage = cifs_release_page,
3682 .invalidatepage = cifs_invalidate_page,
3683 .launder_page = cifs_launder_page,