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 <asm/div64.h>
39 #include "cifsproto.h"
40 #include "cifs_unicode.h"
41 #include "cifs_debug.h"
42 #include "cifs_fs_sb.h"
45 static inline int cifs_convert_flags(unsigned int flags)
47 if ((flags & O_ACCMODE) == O_RDONLY)
49 else if ((flags & O_ACCMODE) == O_WRONLY)
51 else if ((flags & O_ACCMODE) == O_RDWR) {
52 /* GENERIC_ALL is too much permission to request
53 can cause unnecessary access denied on create */
54 /* return GENERIC_ALL; */
55 return (GENERIC_READ | GENERIC_WRITE);
58 return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
59 FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
63 static u32 cifs_posix_convert_flags(unsigned int flags)
67 if ((flags & O_ACCMODE) == O_RDONLY)
68 posix_flags = SMB_O_RDONLY;
69 else if ((flags & O_ACCMODE) == O_WRONLY)
70 posix_flags = SMB_O_WRONLY;
71 else if ((flags & O_ACCMODE) == O_RDWR)
72 posix_flags = SMB_O_RDWR;
75 posix_flags |= SMB_O_CREAT;
77 posix_flags |= SMB_O_EXCL;
79 posix_flags |= SMB_O_TRUNC;
80 /* be safe and imply O_SYNC for O_DSYNC */
82 posix_flags |= SMB_O_SYNC;
83 if (flags & O_DIRECTORY)
84 posix_flags |= SMB_O_DIRECTORY;
85 if (flags & O_NOFOLLOW)
86 posix_flags |= SMB_O_NOFOLLOW;
88 posix_flags |= SMB_O_DIRECT;
93 static inline int cifs_get_disposition(unsigned int flags)
95 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
97 else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
98 return FILE_OVERWRITE_IF;
99 else if ((flags & O_CREAT) == O_CREAT)
101 else if ((flags & O_TRUNC) == O_TRUNC)
102 return FILE_OVERWRITE;
107 static inline int cifs_open_inode_helper(struct inode *inode,
108 struct cifsTconInfo *pTcon, __u32 oplock, FILE_ALL_INFO *buf,
109 char *full_path, int xid)
111 struct cifsInodeInfo *pCifsInode = CIFS_I(inode);
112 struct timespec temp;
115 if (pCifsInode->clientCanCacheRead) {
116 /* we have the inode open somewhere else
117 no need to discard cache data */
118 goto client_can_cache;
121 /* BB need same check in cifs_create too? */
122 /* if not oplocked, invalidate inode pages if mtime or file
124 temp = cifs_NTtimeToUnix(buf->LastWriteTime);
125 if (timespec_equal(&inode->i_mtime, &temp) &&
127 (loff_t)le64_to_cpu(buf->EndOfFile))) {
128 cFYI(1, "inode unchanged on server");
130 if (inode->i_mapping) {
131 /* BB no need to lock inode until after invalidate
132 since namei code should already have it locked? */
133 rc = filemap_write_and_wait(inode->i_mapping);
134 mapping_set_error(inode->i_mapping, rc);
136 cFYI(1, "invalidating remote inode since open detected it "
138 invalidate_remote_inode(inode);
143 rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
146 rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
149 if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
150 pCifsInode->clientCanCacheAll = true;
151 pCifsInode->clientCanCacheRead = true;
152 cFYI(1, "Exclusive Oplock granted on inode %p", inode);
153 } else if ((oplock & 0xF) == OPLOCK_READ)
154 pCifsInode->clientCanCacheRead = true;
159 int cifs_posix_open(char *full_path, struct inode **pinode,
160 struct super_block *sb, int mode, unsigned int f_flags,
161 __u32 *poplock, __u16 *pnetfid, int xid)
164 FILE_UNIX_BASIC_INFO *presp_data;
165 __u32 posix_flags = 0;
166 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
167 struct cifs_fattr fattr;
168 struct tcon_link *tlink;
169 struct cifsTconInfo *tcon;
171 cFYI(1, "posix open %s", full_path);
173 presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
174 if (presp_data == NULL)
177 tlink = cifs_sb_tlink(cifs_sb);
183 tcon = tlink_tcon(tlink);
184 mode &= ~current_umask();
186 posix_flags = cifs_posix_convert_flags(f_flags);
187 rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
188 poplock, full_path, cifs_sb->local_nls,
189 cifs_sb->mnt_cifs_flags &
190 CIFS_MOUNT_MAP_SPECIAL_CHR);
191 cifs_put_tlink(tlink);
196 if (presp_data->Type == cpu_to_le32(-1))
197 goto posix_open_ret; /* open ok, caller does qpathinfo */
200 goto posix_open_ret; /* caller does not need info */
202 cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
204 /* get new inode and set it up */
205 if (*pinode == NULL) {
206 cifs_fill_uniqueid(sb, &fattr);
207 *pinode = cifs_iget(sb, &fattr);
213 cifs_fattr_to_inode(*pinode, &fattr);
221 struct cifsFileInfo *
222 cifs_new_fileinfo(__u16 fileHandle, struct file *file,
223 struct tcon_link *tlink, __u32 oplock)
225 struct dentry *dentry = file->f_path.dentry;
226 struct inode *inode = dentry->d_inode;
227 struct cifsInodeInfo *pCifsInode = CIFS_I(inode);
228 struct cifsFileInfo *pCifsFile;
230 pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
231 if (pCifsFile == NULL)
234 pCifsFile->count = 1;
235 pCifsFile->netfid = fileHandle;
236 pCifsFile->pid = current->tgid;
237 pCifsFile->uid = current_fsuid();
238 pCifsFile->dentry = dget(dentry);
239 pCifsFile->f_flags = file->f_flags;
240 pCifsFile->invalidHandle = false;
241 pCifsFile->tlink = cifs_get_tlink(tlink);
242 mutex_init(&pCifsFile->fh_mutex);
243 mutex_init(&pCifsFile->lock_mutex);
244 INIT_LIST_HEAD(&pCifsFile->llist);
245 INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
247 spin_lock(&cifs_file_list_lock);
248 list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList));
249 /* if readable file instance put first in list*/
250 if (file->f_mode & FMODE_READ)
251 list_add(&pCifsFile->flist, &pCifsInode->openFileList);
253 list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList);
254 spin_unlock(&cifs_file_list_lock);
256 if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
257 pCifsInode->clientCanCacheAll = true;
258 pCifsInode->clientCanCacheRead = true;
259 cFYI(1, "Exclusive Oplock inode %p", inode);
260 } else if ((oplock & 0xF) == OPLOCK_READ)
261 pCifsInode->clientCanCacheRead = true;
263 file->private_data = pCifsFile;
268 * Release a reference on the file private data. This may involve closing
269 * the filehandle out on the server. Must be called without holding
270 * cifs_file_list_lock.
272 void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
274 struct cifsTconInfo *tcon = tlink_tcon(cifs_file->tlink);
275 struct cifsInodeInfo *cifsi = CIFS_I(cifs_file->dentry->d_inode);
276 struct cifsLockInfo *li, *tmp;
278 spin_lock(&cifs_file_list_lock);
279 if (--cifs_file->count > 0) {
280 spin_unlock(&cifs_file_list_lock);
284 /* remove it from the lists */
285 list_del(&cifs_file->flist);
286 list_del(&cifs_file->tlist);
288 if (list_empty(&cifsi->openFileList)) {
289 cFYI(1, "closing last open instance for inode %p",
290 cifs_file->dentry->d_inode);
291 cifsi->clientCanCacheRead = false;
292 cifsi->clientCanCacheAll = false;
294 spin_unlock(&cifs_file_list_lock);
296 if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
300 rc = CIFSSMBClose(xid, tcon, cifs_file->netfid);
304 /* Delete any outstanding lock records. We'll lose them when the file
307 mutex_lock(&cifs_file->lock_mutex);
308 list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) {
309 list_del(&li->llist);
312 mutex_unlock(&cifs_file->lock_mutex);
314 cifs_put_tlink(cifs_file->tlink);
315 dput(cifs_file->dentry);
319 int cifs_open(struct inode *inode, struct file *file)
324 struct cifs_sb_info *cifs_sb;
325 struct cifsTconInfo *tcon;
326 struct tcon_link *tlink;
327 struct cifsFileInfo *pCifsFile = NULL;
328 struct cifsInodeInfo *pCifsInode;
329 char *full_path = NULL;
333 FILE_ALL_INFO *buf = NULL;
337 cifs_sb = CIFS_SB(inode->i_sb);
338 tlink = cifs_sb_tlink(cifs_sb);
341 return PTR_ERR(tlink);
343 tcon = tlink_tcon(tlink);
345 pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
347 full_path = build_path_from_dentry(file->f_path.dentry);
348 if (full_path == NULL) {
353 cFYI(1, "inode = 0x%p file flags are 0x%x for %s",
354 inode, file->f_flags, full_path);
361 if (!tcon->broken_posix_open && tcon->unix_ext &&
362 (tcon->ses->capabilities & CAP_UNIX) &&
363 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
364 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
365 /* can not refresh inode info since size could be stale */
366 rc = cifs_posix_open(full_path, &inode, inode->i_sb,
367 cifs_sb->mnt_file_mode /* ignored */,
368 file->f_flags, &oplock, &netfid, xid);
370 cFYI(1, "posix open succeeded");
372 pCifsFile = cifs_new_fileinfo(netfid, file, tlink,
374 if (pCifsFile == NULL) {
375 CIFSSMBClose(xid, tcon, netfid);
379 cifs_fscache_set_inode_cookie(inode, file);
382 } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
383 if (tcon->ses->serverNOS)
384 cERROR(1, "server %s of type %s returned"
385 " unexpected error on SMB posix open"
386 ", disabling posix open support."
387 " Check if server update available.",
388 tcon->ses->serverName,
389 tcon->ses->serverNOS);
390 tcon->broken_posix_open = true;
391 } else if ((rc != -EIO) && (rc != -EREMOTE) &&
392 (rc != -EOPNOTSUPP)) /* path not found or net err */
394 /* else fallthrough to retry open the old way on network i/o
398 desiredAccess = cifs_convert_flags(file->f_flags);
400 /*********************************************************************
401 * open flag mapping table:
403 * POSIX Flag CIFS Disposition
404 * ---------- ----------------
405 * O_CREAT FILE_OPEN_IF
406 * O_CREAT | O_EXCL FILE_CREATE
407 * O_CREAT | O_TRUNC FILE_OVERWRITE_IF
408 * O_TRUNC FILE_OVERWRITE
409 * none of the above FILE_OPEN
411 * Note that there is not a direct match between disposition
412 * FILE_SUPERSEDE (ie create whether or not file exists although
413 * O_CREAT | O_TRUNC is similar but truncates the existing
414 * file rather than creating a new file as FILE_SUPERSEDE does
415 * (which uses the attributes / metadata passed in on open call)
417 *? O_SYNC is a reasonable match to CIFS writethrough flag
418 *? and the read write flags match reasonably. O_LARGEFILE
419 *? is irrelevant because largefile support is always used
420 *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
421 * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
422 *********************************************************************/
424 disposition = cifs_get_disposition(file->f_flags);
426 /* BB pass O_SYNC flag through on file attributes .. BB */
428 /* Also refresh inode by passing in file_info buf returned by SMBOpen
429 and calling get_inode_info with returned buf (at least helps
430 non-Unix server case) */
432 /* BB we can not do this if this is the second open of a file
433 and the first handle has writebehind data, we might be
434 able to simply do a filemap_fdatawrite/filemap_fdatawait first */
435 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
441 if (tcon->ses->capabilities & CAP_NT_SMBS)
442 rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
443 desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
444 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
445 & CIFS_MOUNT_MAP_SPECIAL_CHR);
447 rc = -EIO; /* no NT SMB support fall into legacy open below */
450 /* Old server, try legacy style OpenX */
451 rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
452 desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
453 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
454 & CIFS_MOUNT_MAP_SPECIAL_CHR);
457 cFYI(1, "cifs_open returned 0x%x", rc);
461 rc = cifs_open_inode_helper(inode, tcon, oplock, buf, full_path, xid);
465 pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock);
466 if (pCifsFile == NULL) {
471 cifs_fscache_set_inode_cookie(inode, file);
473 if (oplock & CIFS_CREATE_ACTION) {
474 /* time to set mode which we can not set earlier due to
475 problems creating new read-only files */
476 if (tcon->unix_ext) {
477 struct cifs_unix_set_info_args args = {
478 .mode = inode->i_mode,
481 .ctime = NO_CHANGE_64,
482 .atime = NO_CHANGE_64,
483 .mtime = NO_CHANGE_64,
486 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
488 cifs_sb->mnt_cifs_flags &
489 CIFS_MOUNT_MAP_SPECIAL_CHR);
497 cifs_put_tlink(tlink);
501 /* Try to reacquire byte range locks that were released when session */
502 /* to server was lost */
503 static int cifs_relock_file(struct cifsFileInfo *cifsFile)
507 /* BB list all locks open on this file and relock */
512 static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush)
517 struct cifs_sb_info *cifs_sb;
518 struct cifsTconInfo *tcon;
519 struct cifsInodeInfo *pCifsInode;
521 char *full_path = NULL;
523 int disposition = FILE_OPEN;
527 mutex_lock(&pCifsFile->fh_mutex);
528 if (!pCifsFile->invalidHandle) {
529 mutex_unlock(&pCifsFile->fh_mutex);
535 inode = pCifsFile->dentry->d_inode;
536 cifs_sb = CIFS_SB(inode->i_sb);
537 tcon = tlink_tcon(pCifsFile->tlink);
539 /* can not grab rename sem here because various ops, including
540 those that already have the rename sem can end up causing writepage
541 to get called and if the server was down that means we end up here,
542 and we can never tell if the caller already has the rename_sem */
543 full_path = build_path_from_dentry(pCifsFile->dentry);
544 if (full_path == NULL) {
546 mutex_unlock(&pCifsFile->fh_mutex);
551 cFYI(1, "inode = 0x%p file flags 0x%x for %s",
552 inode, pCifsFile->f_flags, full_path);
559 if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
560 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
561 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
564 * O_CREAT, O_EXCL and O_TRUNC already had their effect on the
565 * original open. Must mask them off for a reopen.
567 unsigned int oflags = pCifsFile->f_flags &
568 ~(O_CREAT | O_EXCL | O_TRUNC);
570 rc = cifs_posix_open(full_path, NULL, inode->i_sb,
571 cifs_sb->mnt_file_mode /* ignored */,
572 oflags, &oplock, &netfid, xid);
574 cFYI(1, "posix reopen succeeded");
577 /* fallthrough to retry open the old way on errors, especially
578 in the reconnect path it is important to retry hard */
581 desiredAccess = cifs_convert_flags(pCifsFile->f_flags);
583 /* Can not refresh inode by passing in file_info buf to be returned
584 by SMBOpen and then calling get_inode_info with returned buf
585 since file might have write behind data that needs to be flushed
586 and server version of file size can be stale. If we knew for sure
587 that inode was not dirty locally we could do this */
589 rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess,
590 CREATE_NOT_DIR, &netfid, &oplock, NULL,
591 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
592 CIFS_MOUNT_MAP_SPECIAL_CHR);
594 mutex_unlock(&pCifsFile->fh_mutex);
595 cFYI(1, "cifs_open returned 0x%x", rc);
596 cFYI(1, "oplock: %d", oplock);
597 goto reopen_error_exit;
601 pCifsFile->netfid = netfid;
602 pCifsFile->invalidHandle = false;
603 mutex_unlock(&pCifsFile->fh_mutex);
604 pCifsInode = CIFS_I(inode);
607 rc = filemap_write_and_wait(inode->i_mapping);
608 mapping_set_error(inode->i_mapping, rc);
610 pCifsInode->clientCanCacheAll = false;
611 pCifsInode->clientCanCacheRead = false;
613 rc = cifs_get_inode_info_unix(&inode,
614 full_path, inode->i_sb, xid);
616 rc = cifs_get_inode_info(&inode,
617 full_path, NULL, inode->i_sb,
619 } /* else we are writing out data to server already
620 and could deadlock if we tried to flush data, and
621 since we do not know if we have data that would
622 invalidate the current end of file on the server
623 we can not go to the server to get the new inod
625 if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
626 pCifsInode->clientCanCacheAll = true;
627 pCifsInode->clientCanCacheRead = true;
628 cFYI(1, "Exclusive Oplock granted on inode %p",
629 pCifsFile->dentry->d_inode);
630 } else if ((oplock & 0xF) == OPLOCK_READ) {
631 pCifsInode->clientCanCacheRead = true;
632 pCifsInode->clientCanCacheAll = false;
634 pCifsInode->clientCanCacheRead = false;
635 pCifsInode->clientCanCacheAll = false;
637 cifs_relock_file(pCifsFile);
645 int cifs_close(struct inode *inode, struct file *file)
647 cifsFileInfo_put(file->private_data);
648 file->private_data = NULL;
650 /* return code from the ->release op is always ignored */
654 int cifs_closedir(struct inode *inode, struct file *file)
658 struct cifsFileInfo *pCFileStruct = file->private_data;
661 cFYI(1, "Closedir inode = 0x%p", inode);
666 struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink);
668 cFYI(1, "Freeing private data in close dir");
669 spin_lock(&cifs_file_list_lock);
670 if (!pCFileStruct->srch_inf.endOfSearch &&
671 !pCFileStruct->invalidHandle) {
672 pCFileStruct->invalidHandle = true;
673 spin_unlock(&cifs_file_list_lock);
674 rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
675 cFYI(1, "Closing uncompleted readdir with rc %d",
677 /* not much we can do if it fails anyway, ignore rc */
680 spin_unlock(&cifs_file_list_lock);
681 ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
683 cFYI(1, "closedir free smb buf in srch struct");
684 pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
685 if (pCFileStruct->srch_inf.smallBuf)
686 cifs_small_buf_release(ptmp);
688 cifs_buf_release(ptmp);
690 cifs_put_tlink(pCFileStruct->tlink);
691 kfree(file->private_data);
692 file->private_data = NULL;
694 /* BB can we lock the filestruct while this is going on? */
699 static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
700 __u64 offset, __u8 lockType)
702 struct cifsLockInfo *li =
703 kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
709 mutex_lock(&fid->lock_mutex);
710 list_add(&li->llist, &fid->llist);
711 mutex_unlock(&fid->lock_mutex);
715 int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
721 bool wait_flag = false;
722 struct cifs_sb_info *cifs_sb;
723 struct cifsTconInfo *tcon;
725 __u8 lockType = LOCKING_ANDX_LARGE_FILES;
726 bool posix_locking = 0;
728 length = 1 + pfLock->fl_end - pfLock->fl_start;
732 cFYI(1, "Lock parm: 0x%x flockflags: "
733 "0x%x flocktype: 0x%x start: %lld end: %lld",
734 cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
737 if (pfLock->fl_flags & FL_POSIX)
739 if (pfLock->fl_flags & FL_FLOCK)
741 if (pfLock->fl_flags & FL_SLEEP) {
742 cFYI(1, "Blocking lock");
745 if (pfLock->fl_flags & FL_ACCESS)
746 cFYI(1, "Process suspended by mandatory locking - "
747 "not implemented yet");
748 if (pfLock->fl_flags & FL_LEASE)
749 cFYI(1, "Lease on file - not implemented yet");
750 if (pfLock->fl_flags &
751 (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
752 cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags);
754 if (pfLock->fl_type == F_WRLCK) {
757 } else if (pfLock->fl_type == F_UNLCK) {
760 /* Check if unlock includes more than
762 } else if (pfLock->fl_type == F_RDLCK) {
764 lockType |= LOCKING_ANDX_SHARED_LOCK;
766 } else if (pfLock->fl_type == F_EXLCK) {
769 } else if (pfLock->fl_type == F_SHLCK) {
771 lockType |= LOCKING_ANDX_SHARED_LOCK;
774 cFYI(1, "Unknown type of lock");
776 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
777 tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink);
779 if (file->private_data == NULL) {
784 netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
786 if ((tcon->ses->capabilities & CAP_UNIX) &&
787 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
788 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
790 /* BB add code here to normalize offset and length to
791 account for negative length which we can not accept over the
796 if (lockType & LOCKING_ANDX_SHARED_LOCK)
797 posix_lock_type = CIFS_RDLCK;
799 posix_lock_type = CIFS_WRLCK;
800 rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */,
802 posix_lock_type, wait_flag);
807 /* BB we could chain these into one lock request BB */
808 rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start,
809 0, 1, lockType, 0 /* wait flag */ );
811 rc = CIFSSMBLock(xid, tcon, netfid, length,
812 pfLock->fl_start, 1 /* numUnlock */ ,
813 0 /* numLock */ , lockType,
815 pfLock->fl_type = F_UNLCK;
817 cERROR(1, "Error unlocking previously locked "
818 "range %d during test of lock", rc);
822 /* if rc == ERR_SHARING_VIOLATION ? */
825 if (lockType & LOCKING_ANDX_SHARED_LOCK) {
826 pfLock->fl_type = F_WRLCK;
828 rc = CIFSSMBLock(xid, tcon, netfid, length,
829 pfLock->fl_start, 0, 1,
830 lockType | LOCKING_ANDX_SHARED_LOCK,
833 rc = CIFSSMBLock(xid, tcon, netfid,
834 length, pfLock->fl_start, 1, 0,
836 LOCKING_ANDX_SHARED_LOCK,
838 pfLock->fl_type = F_RDLCK;
840 cERROR(1, "Error unlocking "
841 "previously locked range %d "
842 "during test of lock", rc);
845 pfLock->fl_type = F_WRLCK;
855 if (!numLock && !numUnlock) {
856 /* if no lock or unlock then nothing
857 to do since we do not know what it is */
864 if (lockType & LOCKING_ANDX_SHARED_LOCK)
865 posix_lock_type = CIFS_RDLCK;
867 posix_lock_type = CIFS_WRLCK;
870 posix_lock_type = CIFS_UNLCK;
872 rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */,
874 posix_lock_type, wait_flag);
876 struct cifsFileInfo *fid = file->private_data;
879 rc = CIFSSMBLock(xid, tcon, netfid, length,
881 0, numLock, lockType, wait_flag);
884 /* For Windows locks we must store them. */
885 rc = store_file_lock(fid, length,
886 pfLock->fl_start, lockType);
888 } else if (numUnlock) {
889 /* For each stored lock that this unlock overlaps
890 completely, unlock it. */
892 struct cifsLockInfo *li, *tmp;
895 mutex_lock(&fid->lock_mutex);
896 list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
897 if (pfLock->fl_start <= li->offset &&
898 (pfLock->fl_start + length) >=
899 (li->offset + li->length)) {
900 stored_rc = CIFSSMBLock(xid, tcon,
902 li->length, li->offset,
903 1, 0, li->type, false);
907 list_del(&li->llist);
912 mutex_unlock(&fid->lock_mutex);
916 if (pfLock->fl_flags & FL_POSIX)
917 posix_lock_file_wait(file, pfLock);
923 * Set the timeout on write requests past EOF. For some servers (Windows)
924 * these calls can be very long.
926 * If we're writing >10M past the EOF we give a 180s timeout. Anything less
927 * than that gets a 45s timeout. Writes not past EOF get 15s timeouts.
928 * The 10M cutoff is totally arbitrary. A better scheme for this would be
929 * welcome if someone wants to suggest one.
931 * We may be able to do a better job with this if there were some way to
932 * declare that a file should be sparse.
935 cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset)
937 if (offset <= cifsi->server_eof)
939 else if (offset > (cifsi->server_eof + (10 * 1024 * 1024)))
940 return CIFS_VLONG_OP;
945 /* update the file size (if needed) after a write */
947 cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
948 unsigned int bytes_written)
950 loff_t end_of_write = offset + bytes_written;
952 if (end_of_write > cifsi->server_eof)
953 cifsi->server_eof = end_of_write;
956 ssize_t cifs_user_write(struct file *file, const char __user *write_data,
957 size_t write_size, loff_t *poffset)
960 unsigned int bytes_written = 0;
961 unsigned int total_written;
962 struct cifs_sb_info *cifs_sb;
963 struct cifsTconInfo *pTcon;
965 struct cifsFileInfo *open_file;
966 struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode);
968 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
970 /* cFYI(1, " write %d bytes to offset %lld of %s", write_size,
971 *poffset, file->f_path.dentry->d_name.name); */
973 if (file->private_data == NULL)
976 open_file = file->private_data;
977 pTcon = tlink_tcon(open_file->tlink);
979 rc = generic_write_checks(file, poffset, &write_size, 0);
985 long_op = cifs_write_timeout(cifsi, *poffset);
986 for (total_written = 0; write_size > total_written;
987 total_written += bytes_written) {
989 while (rc == -EAGAIN) {
990 if (file->private_data == NULL) {
991 /* file has been closed on us */
993 /* if we have gotten here we have written some data
994 and blocked, and the file has been freed on us while
995 we blocked so return what we managed to write */
996 return total_written;
998 if (open_file->invalidHandle) {
999 /* we could deadlock if we called
1000 filemap_fdatawait from here so tell
1001 reopen_file not to flush data to server
1003 rc = cifs_reopen_file(open_file, false);
1008 rc = CIFSSMBWrite(xid, pTcon,
1010 min_t(const int, cifs_sb->wsize,
1011 write_size - total_written),
1012 *poffset, &bytes_written,
1013 NULL, write_data + total_written, long_op);
1015 if (rc || (bytes_written == 0)) {
1023 cifs_update_eof(cifsi, *poffset, bytes_written);
1024 *poffset += bytes_written;
1026 long_op = CIFS_STD_OP; /* subsequent writes fast -
1027 15 seconds is plenty */
1030 cifs_stats_bytes_written(pTcon, total_written);
1032 /* since the write may have blocked check these pointers again */
1033 if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) {
1034 struct inode *inode = file->f_path.dentry->d_inode;
1035 /* Do not update local mtime - server will set its actual value on write
1036 * inode->i_ctime = inode->i_mtime =
1037 * current_fs_time(inode->i_sb);*/
1038 if (total_written > 0) {
1039 spin_lock(&inode->i_lock);
1040 if (*poffset > file->f_path.dentry->d_inode->i_size)
1041 i_size_write(file->f_path.dentry->d_inode,
1043 spin_unlock(&inode->i_lock);
1045 mark_inode_dirty_sync(file->f_path.dentry->d_inode);
1048 return total_written;
1051 static ssize_t cifs_write(struct cifsFileInfo *open_file,
1052 const char *write_data, size_t write_size,
1056 unsigned int bytes_written = 0;
1057 unsigned int total_written;
1058 struct cifs_sb_info *cifs_sb;
1059 struct cifsTconInfo *pTcon;
1061 struct dentry *dentry = open_file->dentry;
1062 struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode);
1064 cifs_sb = CIFS_SB(dentry->d_sb);
1066 cFYI(1, "write %zd bytes to offset %lld of %s", write_size,
1067 *poffset, dentry->d_name.name);
1069 pTcon = tlink_tcon(open_file->tlink);
1073 long_op = cifs_write_timeout(cifsi, *poffset);
1074 for (total_written = 0; write_size > total_written;
1075 total_written += bytes_written) {
1077 while (rc == -EAGAIN) {
1078 if (open_file->invalidHandle) {
1079 /* we could deadlock if we called
1080 filemap_fdatawait from here so tell
1081 reopen_file not to flush data to
1083 rc = cifs_reopen_file(open_file, false);
1087 if (experimEnabled || (pTcon->ses->server &&
1088 ((pTcon->ses->server->secMode &
1089 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
1094 len = min((size_t)cifs_sb->wsize,
1095 write_size - total_written);
1096 /* iov[0] is reserved for smb header */
1097 iov[1].iov_base = (char *)write_data +
1099 iov[1].iov_len = len;
1100 rc = CIFSSMBWrite2(xid, pTcon,
1101 open_file->netfid, len,
1102 *poffset, &bytes_written,
1105 rc = CIFSSMBWrite(xid, pTcon,
1107 min_t(const int, cifs_sb->wsize,
1108 write_size - total_written),
1109 *poffset, &bytes_written,
1110 write_data + total_written,
1113 if (rc || (bytes_written == 0)) {
1121 cifs_update_eof(cifsi, *poffset, bytes_written);
1122 *poffset += bytes_written;
1124 long_op = CIFS_STD_OP; /* subsequent writes fast -
1125 15 seconds is plenty */
1128 cifs_stats_bytes_written(pTcon, total_written);
1130 if (total_written > 0) {
1131 spin_lock(&dentry->d_inode->i_lock);
1132 if (*poffset > dentry->d_inode->i_size)
1133 i_size_write(dentry->d_inode, *poffset);
1134 spin_unlock(&dentry->d_inode->i_lock);
1136 mark_inode_dirty_sync(dentry->d_inode);
1138 return total_written;
1141 #ifdef CONFIG_CIFS_EXPERIMENTAL
1142 struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
1145 struct cifsFileInfo *open_file = NULL;
1146 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1148 /* only filter by fsuid on multiuser mounts */
1149 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1152 spin_lock(&cifs_file_list_lock);
1153 /* we could simply get the first_list_entry since write-only entries
1154 are always at the end of the list but since the first entry might
1155 have a close pending, we go through the whole list */
1156 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1157 if (fsuid_only && open_file->uid != current_fsuid())
1159 if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
1160 if (!open_file->invalidHandle) {
1161 /* found a good file */
1162 /* lock it so it will not be closed on us */
1163 cifsFileInfo_get(open_file);
1164 spin_unlock(&cifs_file_list_lock);
1166 } /* else might as well continue, and look for
1167 another, or simply have the caller reopen it
1168 again rather than trying to fix this handle */
1169 } else /* write only file */
1170 break; /* write only files are last so must be done */
1172 spin_unlock(&cifs_file_list_lock);
1177 struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
1180 struct cifsFileInfo *open_file;
1181 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1182 bool any_available = false;
1185 /* Having a null inode here (because mapping->host was set to zero by
1186 the VFS or MM) should not happen but we had reports of on oops (due to
1187 it being zero) during stress testcases so we need to check for it */
1189 if (cifs_inode == NULL) {
1190 cERROR(1, "Null inode passed to cifs_writeable_file");
1195 /* only filter by fsuid on multiuser mounts */
1196 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1199 spin_lock(&cifs_file_list_lock);
1201 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1202 if (!any_available && open_file->pid != current->tgid)
1204 if (fsuid_only && open_file->uid != current_fsuid())
1206 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
1207 cifsFileInfo_get(open_file);
1209 if (!open_file->invalidHandle) {
1210 /* found a good writable file */
1211 spin_unlock(&cifs_file_list_lock);
1215 spin_unlock(&cifs_file_list_lock);
1217 /* Had to unlock since following call can block */
1218 rc = cifs_reopen_file(open_file, false);
1222 /* if it fails, try another handle if possible */
1223 cFYI(1, "wp failed on reopen file");
1224 cifsFileInfo_put(open_file);
1226 spin_lock(&cifs_file_list_lock);
1228 /* else we simply continue to the next entry. Thus
1229 we do not loop on reopen errors. If we
1230 can not reopen the file, for example if we
1231 reconnected to a server with another client
1232 racing to delete or lock the file we would not
1233 make progress if we restarted before the beginning
1234 of the loop here. */
1237 /* couldn't find useable FH with same pid, try any available */
1238 if (!any_available) {
1239 any_available = true;
1240 goto refind_writable;
1242 spin_unlock(&cifs_file_list_lock);
1246 static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
1248 struct address_space *mapping = page->mapping;
1249 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1252 int bytes_written = 0;
1253 struct cifs_sb_info *cifs_sb;
1254 struct inode *inode;
1255 struct cifsFileInfo *open_file;
1257 if (!mapping || !mapping->host)
1260 inode = page->mapping->host;
1261 cifs_sb = CIFS_SB(inode->i_sb);
1263 offset += (loff_t)from;
1264 write_data = kmap(page);
1267 if ((to > PAGE_CACHE_SIZE) || (from > to)) {
1272 /* racing with truncate? */
1273 if (offset > mapping->host->i_size) {
1275 return 0; /* don't care */
1278 /* check to make sure that we are not extending the file */
1279 if (mapping->host->i_size - offset < (loff_t)to)
1280 to = (unsigned)(mapping->host->i_size - offset);
1282 open_file = find_writable_file(CIFS_I(mapping->host), false);
1284 bytes_written = cifs_write(open_file, write_data,
1285 to - from, &offset);
1286 cifsFileInfo_put(open_file);
1287 /* Does mm or vfs already set times? */
1288 inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
1289 if ((bytes_written > 0) && (offset))
1291 else if (bytes_written < 0)
1294 cFYI(1, "No writeable filehandles for inode");
1302 static int cifs_writepages(struct address_space *mapping,
1303 struct writeback_control *wbc)
1305 unsigned int bytes_to_write;
1306 unsigned int bytes_written;
1307 struct cifs_sb_info *cifs_sb;
1311 int range_whole = 0;
1318 struct cifsFileInfo *open_file;
1319 struct cifsTconInfo *tcon;
1320 struct cifsInodeInfo *cifsi = CIFS_I(mapping->host);
1322 struct pagevec pvec;
1327 cifs_sb = CIFS_SB(mapping->host->i_sb);
1330 * If wsize is smaller that the page cache size, default to writing
1331 * one page at a time via cifs_writepage
1333 if (cifs_sb->wsize < PAGE_CACHE_SIZE)
1334 return generic_writepages(mapping, wbc);
1336 iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL);
1338 return generic_writepages(mapping, wbc);
1341 * if there's no open file, then this is likely to fail too,
1342 * but it'll at least handle the return. Maybe it should be
1345 open_file = find_writable_file(CIFS_I(mapping->host), false);
1348 return generic_writepages(mapping, wbc);
1351 tcon = tlink_tcon(open_file->tlink);
1352 if (!experimEnabled && tcon->ses->server->secMode &
1353 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
1354 cifsFileInfo_put(open_file);
1356 return generic_writepages(mapping, wbc);
1358 cifsFileInfo_put(open_file);
1362 pagevec_init(&pvec, 0);
1363 if (wbc->range_cyclic) {
1364 index = mapping->writeback_index; /* Start from prev offset */
1367 index = wbc->range_start >> PAGE_CACHE_SHIFT;
1368 end = wbc->range_end >> PAGE_CACHE_SHIFT;
1369 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1374 while (!done && (index <= end) &&
1375 (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
1376 PAGECACHE_TAG_DIRTY,
1377 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) {
1386 for (i = 0; i < nr_pages; i++) {
1387 page = pvec.pages[i];
1389 * At this point we hold neither mapping->tree_lock nor
1390 * lock on the page itself: the page may be truncated or
1391 * invalidated (changing page->mapping to NULL), or even
1392 * swizzled back from swapper_space to tmpfs file
1398 else if (!trylock_page(page))
1401 if (unlikely(page->mapping != mapping)) {
1406 if (!wbc->range_cyclic && page->index > end) {
1412 if (next && (page->index != next)) {
1413 /* Not next consecutive page */
1418 if (wbc->sync_mode != WB_SYNC_NONE)
1419 wait_on_page_writeback(page);
1421 if (PageWriteback(page) ||
1422 !clear_page_dirty_for_io(page)) {
1428 * This actually clears the dirty bit in the radix tree.
1429 * See cifs_writepage() for more commentary.
1431 set_page_writeback(page);
1433 if (page_offset(page) >= mapping->host->i_size) {
1436 end_page_writeback(page);
1441 * BB can we get rid of this? pages are held by pvec
1443 page_cache_get(page);
1445 len = min(mapping->host->i_size - page_offset(page),
1446 (loff_t)PAGE_CACHE_SIZE);
1448 /* reserve iov[0] for the smb header */
1450 iov[n_iov].iov_base = kmap(page);
1451 iov[n_iov].iov_len = len;
1452 bytes_to_write += len;
1456 offset = page_offset(page);
1458 next = page->index + 1;
1459 if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize)
1463 open_file = find_writable_file(CIFS_I(mapping->host),
1466 cERROR(1, "No writable handles for inode");
1469 long_op = cifs_write_timeout(cifsi, offset);
1470 rc = CIFSSMBWrite2(xid, tcon, open_file->netfid,
1471 bytes_to_write, offset,
1472 &bytes_written, iov, n_iov,
1474 cifsFileInfo_put(open_file);
1475 cifs_update_eof(cifsi, offset, bytes_written);
1478 if (rc || bytes_written < bytes_to_write) {
1479 cERROR(1, "Write2 ret %d, wrote %d",
1481 mapping_set_error(mapping, rc);
1483 cifs_stats_bytes_written(tcon, bytes_written);
1486 for (i = 0; i < n_iov; i++) {
1487 page = pvec.pages[first + i];
1488 /* Should we also set page error on
1489 success rc but too little data written? */
1490 /* BB investigate retry logic on temporary
1491 server crash cases and how recovery works
1492 when page marked as error */
1497 end_page_writeback(page);
1498 page_cache_release(page);
1500 if ((wbc->nr_to_write -= n_iov) <= 0)
1504 /* Need to re-find the pages we skipped */
1505 index = pvec.pages[0]->index + 1;
1507 pagevec_release(&pvec);
1509 if (!scanned && !done) {
1511 * We hit the last page and there is more work to be done: wrap
1512 * back to the start of the file
1518 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1519 mapping->writeback_index = index;
1526 static int cifs_writepage(struct page *page, struct writeback_control *wbc)
1532 /* BB add check for wbc flags */
1533 page_cache_get(page);
1534 if (!PageUptodate(page))
1535 cFYI(1, "ppw - page not up to date");
1538 * Set the "writeback" flag, and clear "dirty" in the radix tree.
1540 * A writepage() implementation always needs to do either this,
1541 * or re-dirty the page with "redirty_page_for_writepage()" in
1542 * the case of a failure.
1544 * Just unlocking the page will cause the radix tree tag-bits
1545 * to fail to update with the state of the page correctly.
1547 set_page_writeback(page);
1548 rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
1549 SetPageUptodate(page); /* BB add check for error and Clearuptodate? */
1551 end_page_writeback(page);
1552 page_cache_release(page);
1557 static int cifs_write_end(struct file *file, struct address_space *mapping,
1558 loff_t pos, unsigned len, unsigned copied,
1559 struct page *page, void *fsdata)
1562 struct inode *inode = mapping->host;
1564 cFYI(1, "write_end for page %p from pos %lld with %d bytes",
1567 if (PageChecked(page)) {
1569 SetPageUptodate(page);
1570 ClearPageChecked(page);
1571 } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
1572 SetPageUptodate(page);
1574 if (!PageUptodate(page)) {
1576 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
1580 /* this is probably better than directly calling
1581 partialpage_write since in this function the file handle is
1582 known which we might as well leverage */
1583 /* BB check if anything else missing out of ppw
1584 such as updating last write time */
1585 page_data = kmap(page);
1586 rc = cifs_write(file->private_data, page_data + offset,
1588 /* if (rc < 0) should we set writebehind rc? */
1595 set_page_dirty(page);
1599 spin_lock(&inode->i_lock);
1600 if (pos > inode->i_size)
1601 i_size_write(inode, pos);
1602 spin_unlock(&inode->i_lock);
1606 page_cache_release(page);
1611 int cifs_fsync(struct file *file, int datasync)
1615 struct cifsTconInfo *tcon;
1616 struct cifsFileInfo *smbfile = file->private_data;
1617 struct inode *inode = file->f_path.dentry->d_inode;
1621 cFYI(1, "Sync file - name: %s datasync: 0x%x",
1622 file->f_path.dentry->d_name.name, datasync);
1624 rc = filemap_write_and_wait(inode->i_mapping);
1626 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1628 tcon = tlink_tcon(smbfile->tlink);
1629 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
1630 rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
1637 /* static void cifs_sync_page(struct page *page)
1639 struct address_space *mapping;
1640 struct inode *inode;
1641 unsigned long index = page->index;
1642 unsigned int rpages = 0;
1645 cFYI(1, "sync page %p", page);
1646 mapping = page->mapping;
1649 inode = mapping->host;
1653 /* fill in rpages then
1654 result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
1656 /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index);
1666 * As file closes, flush all cached write data for this inode checking
1667 * for write behind errors.
1669 int cifs_flush(struct file *file, fl_owner_t id)
1671 struct inode *inode = file->f_path.dentry->d_inode;
1674 if (file->f_mode & FMODE_WRITE)
1675 rc = filemap_write_and_wait(inode->i_mapping);
1677 cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc);
1682 ssize_t cifs_user_read(struct file *file, char __user *read_data,
1683 size_t read_size, loff_t *poffset)
1686 unsigned int bytes_read = 0;
1687 unsigned int total_read = 0;
1688 unsigned int current_read_size;
1689 struct cifs_sb_info *cifs_sb;
1690 struct cifsTconInfo *pTcon;
1692 struct cifsFileInfo *open_file;
1693 char *smb_read_data;
1694 char __user *current_offset;
1695 struct smb_com_read_rsp *pSMBr;
1698 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1700 if (file->private_data == NULL) {
1705 open_file = file->private_data;
1706 pTcon = tlink_tcon(open_file->tlink);
1708 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
1709 cFYI(1, "attempting read on write only file instance");
1711 for (total_read = 0, current_offset = read_data;
1712 read_size > total_read;
1713 total_read += bytes_read, current_offset += bytes_read) {
1714 current_read_size = min_t(const int, read_size - total_read,
1717 smb_read_data = NULL;
1718 while (rc == -EAGAIN) {
1719 int buf_type = CIFS_NO_BUFFER;
1720 if (open_file->invalidHandle) {
1721 rc = cifs_reopen_file(open_file, true);
1725 rc = CIFSSMBRead(xid, pTcon,
1727 current_read_size, *poffset,
1728 &bytes_read, &smb_read_data,
1730 pSMBr = (struct smb_com_read_rsp *)smb_read_data;
1731 if (smb_read_data) {
1732 if (copy_to_user(current_offset,
1734 4 /* RFC1001 length field */ +
1735 le16_to_cpu(pSMBr->DataOffset),
1739 if (buf_type == CIFS_SMALL_BUFFER)
1740 cifs_small_buf_release(smb_read_data);
1741 else if (buf_type == CIFS_LARGE_BUFFER)
1742 cifs_buf_release(smb_read_data);
1743 smb_read_data = NULL;
1746 if (rc || (bytes_read == 0)) {
1754 cifs_stats_bytes_read(pTcon, bytes_read);
1755 *poffset += bytes_read;
1763 static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
1767 unsigned int bytes_read = 0;
1768 unsigned int total_read;
1769 unsigned int current_read_size;
1770 struct cifs_sb_info *cifs_sb;
1771 struct cifsTconInfo *pTcon;
1773 char *current_offset;
1774 struct cifsFileInfo *open_file;
1775 int buf_type = CIFS_NO_BUFFER;
1778 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1780 if (file->private_data == NULL) {
1785 open_file = file->private_data;
1786 pTcon = tlink_tcon(open_file->tlink);
1788 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
1789 cFYI(1, "attempting read on write only file instance");
1791 for (total_read = 0, current_offset = read_data;
1792 read_size > total_read;
1793 total_read += bytes_read, current_offset += bytes_read) {
1794 current_read_size = min_t(const int, read_size - total_read,
1796 /* For windows me and 9x we do not want to request more
1797 than it negotiated since it will refuse the read then */
1799 !(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
1800 current_read_size = min_t(const int, current_read_size,
1801 pTcon->ses->server->maxBuf - 128);
1804 while (rc == -EAGAIN) {
1805 if (open_file->invalidHandle) {
1806 rc = cifs_reopen_file(open_file, true);
1810 rc = CIFSSMBRead(xid, pTcon,
1812 current_read_size, *poffset,
1813 &bytes_read, ¤t_offset,
1816 if (rc || (bytes_read == 0)) {
1824 cifs_stats_bytes_read(pTcon, total_read);
1825 *poffset += bytes_read;
1832 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
1837 rc = cifs_revalidate_file(file);
1839 cFYI(1, "Validation prior to mmap failed, error=%d", rc);
1843 rc = generic_file_mmap(file, vma);
1849 static void cifs_copy_cache_pages(struct address_space *mapping,
1850 struct list_head *pages, int bytes_read, char *data)
1855 while (bytes_read > 0) {
1856 if (list_empty(pages))
1859 page = list_entry(pages->prev, struct page, lru);
1860 list_del(&page->lru);
1862 if (add_to_page_cache_lru(page, mapping, page->index,
1864 page_cache_release(page);
1865 cFYI(1, "Add page cache failed");
1866 data += PAGE_CACHE_SIZE;
1867 bytes_read -= PAGE_CACHE_SIZE;
1870 page_cache_release(page);
1872 target = kmap_atomic(page, KM_USER0);
1874 if (PAGE_CACHE_SIZE > bytes_read) {
1875 memcpy(target, data, bytes_read);
1876 /* zero the tail end of this partial page */
1877 memset(target + bytes_read, 0,
1878 PAGE_CACHE_SIZE - bytes_read);
1881 memcpy(target, data, PAGE_CACHE_SIZE);
1882 bytes_read -= PAGE_CACHE_SIZE;
1884 kunmap_atomic(target, KM_USER0);
1886 flush_dcache_page(page);
1887 SetPageUptodate(page);
1889 data += PAGE_CACHE_SIZE;
1891 /* add page to FS-Cache */
1892 cifs_readpage_to_fscache(mapping->host, page);
1897 static int cifs_readpages(struct file *file, struct address_space *mapping,
1898 struct list_head *page_list, unsigned num_pages)
1904 struct cifs_sb_info *cifs_sb;
1905 struct cifsTconInfo *pTcon;
1906 unsigned int bytes_read = 0;
1907 unsigned int read_size, i;
1908 char *smb_read_data = NULL;
1909 struct smb_com_read_rsp *pSMBr;
1910 struct cifsFileInfo *open_file;
1911 int buf_type = CIFS_NO_BUFFER;
1914 if (file->private_data == NULL) {
1919 open_file = file->private_data;
1920 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1921 pTcon = tlink_tcon(open_file->tlink);
1924 * Reads as many pages as possible from fscache. Returns -ENOBUFS
1925 * immediately if the cookie is negative
1927 rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
1932 cFYI(DBG2, "rpages: num pages %d", num_pages);
1933 for (i = 0; i < num_pages; ) {
1934 unsigned contig_pages;
1935 struct page *tmp_page;
1936 unsigned long expected_index;
1938 if (list_empty(page_list))
1941 page = list_entry(page_list->prev, struct page, lru);
1942 offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1944 /* count adjacent pages that we will read into */
1947 list_entry(page_list->prev, struct page, lru)->index;
1948 list_for_each_entry_reverse(tmp_page, page_list, lru) {
1949 if (tmp_page->index == expected_index) {
1955 if (contig_pages + i > num_pages)
1956 contig_pages = num_pages - i;
1958 /* for reads over a certain size could initiate async
1961 read_size = contig_pages * PAGE_CACHE_SIZE;
1962 /* Read size needs to be in multiples of one page */
1963 read_size = min_t(const unsigned int, read_size,
1964 cifs_sb->rsize & PAGE_CACHE_MASK);
1965 cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d",
1966 read_size, contig_pages);
1968 while (rc == -EAGAIN) {
1969 if (open_file->invalidHandle) {
1970 rc = cifs_reopen_file(open_file, true);
1975 rc = CIFSSMBRead(xid, pTcon,
1978 &bytes_read, &smb_read_data,
1980 /* BB more RC checks ? */
1981 if (rc == -EAGAIN) {
1982 if (smb_read_data) {
1983 if (buf_type == CIFS_SMALL_BUFFER)
1984 cifs_small_buf_release(smb_read_data);
1985 else if (buf_type == CIFS_LARGE_BUFFER)
1986 cifs_buf_release(smb_read_data);
1987 smb_read_data = NULL;
1991 if ((rc < 0) || (smb_read_data == NULL)) {
1992 cFYI(1, "Read error in readpages: %d", rc);
1994 } else if (bytes_read > 0) {
1995 task_io_account_read(bytes_read);
1996 pSMBr = (struct smb_com_read_rsp *)smb_read_data;
1997 cifs_copy_cache_pages(mapping, page_list, bytes_read,
1998 smb_read_data + 4 /* RFC1001 hdr */ +
1999 le16_to_cpu(pSMBr->DataOffset));
2001 i += bytes_read >> PAGE_CACHE_SHIFT;
2002 cifs_stats_bytes_read(pTcon, bytes_read);
2003 if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) {
2004 i++; /* account for partial page */
2006 /* server copy of file can have smaller size
2008 /* BB do we need to verify this common case ?
2009 this case is ok - if we are at server EOF
2010 we will hit it on next read */
2015 cFYI(1, "No bytes read (%d) at offset %lld . "
2016 "Cleaning remaining pages from readahead list",
2017 bytes_read, offset);
2018 /* BB turn off caching and do new lookup on
2019 file size at server? */
2022 if (smb_read_data) {
2023 if (buf_type == CIFS_SMALL_BUFFER)
2024 cifs_small_buf_release(smb_read_data);
2025 else if (buf_type == CIFS_LARGE_BUFFER)
2026 cifs_buf_release(smb_read_data);
2027 smb_read_data = NULL;
2032 /* need to free smb_read_data buf before exit */
2033 if (smb_read_data) {
2034 if (buf_type == CIFS_SMALL_BUFFER)
2035 cifs_small_buf_release(smb_read_data);
2036 else if (buf_type == CIFS_LARGE_BUFFER)
2037 cifs_buf_release(smb_read_data);
2038 smb_read_data = NULL;
2046 static int cifs_readpage_worker(struct file *file, struct page *page,
2052 /* Is the page cached? */
2053 rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page);
2057 page_cache_get(page);
2058 read_data = kmap(page);
2059 /* for reads over a certain size could initiate async read ahead */
2061 rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
2066 cFYI(1, "Bytes read %d", rc);
2068 file->f_path.dentry->d_inode->i_atime =
2069 current_fs_time(file->f_path.dentry->d_inode->i_sb);
2071 if (PAGE_CACHE_SIZE > rc)
2072 memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
2074 flush_dcache_page(page);
2075 SetPageUptodate(page);
2077 /* send this page to the cache */
2078 cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page);
2084 page_cache_release(page);
2090 static int cifs_readpage(struct file *file, struct page *page)
2092 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
2098 if (file->private_data == NULL) {
2104 cFYI(1, "readpage %p at offset %d 0x%x\n",
2105 page, (int)offset, (int)offset);
2107 rc = cifs_readpage_worker(file, page, &offset);
2115 static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
2117 struct cifsFileInfo *open_file;
2119 spin_lock(&cifs_file_list_lock);
2120 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
2121 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
2122 spin_unlock(&cifs_file_list_lock);
2126 spin_unlock(&cifs_file_list_lock);
2130 /* We do not want to update the file size from server for inodes
2131 open for write - to avoid races with writepage extending
2132 the file - in the future we could consider allowing
2133 refreshing the inode only on increases in the file size
2134 but this is tricky to do without racing with writebehind
2135 page caching in the current Linux kernel design */
2136 bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
2141 if (is_inode_writable(cifsInode)) {
2142 /* This inode is open for write at least once */
2143 struct cifs_sb_info *cifs_sb;
2145 cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
2146 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
2147 /* since no page cache to corrupt on directio
2148 we can change size safely */
2152 if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
2160 static int cifs_write_begin(struct file *file, struct address_space *mapping,
2161 loff_t pos, unsigned len, unsigned flags,
2162 struct page **pagep, void **fsdata)
2164 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
2165 loff_t offset = pos & (PAGE_CACHE_SIZE - 1);
2166 loff_t page_start = pos & PAGE_MASK;
2171 cFYI(1, "write_begin from %lld len %d", (long long)pos, len);
2173 page = grab_cache_page_write_begin(mapping, index, flags);
2179 if (PageUptodate(page))
2183 * If we write a full page it will be up to date, no need to read from
2184 * the server. If the write is short, we'll end up doing a sync write
2187 if (len == PAGE_CACHE_SIZE)
2191 * optimize away the read when we have an oplock, and we're not
2192 * expecting to use any of the data we'd be reading in. That
2193 * is, when the page lies beyond the EOF, or straddles the EOF
2194 * and the write will cover all of the existing data.
2196 if (CIFS_I(mapping->host)->clientCanCacheRead) {
2197 i_size = i_size_read(mapping->host);
2198 if (page_start >= i_size ||
2199 (offset == 0 && (pos + len) >= i_size)) {
2200 zero_user_segments(page, 0, offset,
2204 * PageChecked means that the parts of the page
2205 * to which we're not writing are considered up
2206 * to date. Once the data is copied to the
2207 * page, it can be set uptodate.
2209 SetPageChecked(page);
2214 if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
2216 * might as well read a page, it is fast enough. If we get
2217 * an error, we don't need to return it. cifs_write_end will
2218 * do a sync write instead since PG_uptodate isn't set.
2220 cifs_readpage_worker(file, page, &page_start);
2222 /* we could try using another file handle if there is one -
2223 but how would we lock it to prevent close of that handle
2224 racing with this read? In any case
2225 this will be written out by write_end so is fine */
2232 static int cifs_release_page(struct page *page, gfp_t gfp)
2234 if (PagePrivate(page))
2237 return cifs_fscache_release_page(page, gfp);
2240 static void cifs_invalidate_page(struct page *page, unsigned long offset)
2242 struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
2245 cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
2248 void cifs_oplock_break(struct work_struct *work)
2250 struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
2252 struct inode *inode = cfile->dentry->d_inode;
2253 struct cifsInodeInfo *cinode = CIFS_I(inode);
2256 if (inode && S_ISREG(inode->i_mode)) {
2257 if (cinode->clientCanCacheRead)
2258 break_lease(inode, O_RDONLY);
2260 break_lease(inode, O_WRONLY);
2261 rc = filemap_fdatawrite(inode->i_mapping);
2262 if (cinode->clientCanCacheRead == 0) {
2263 rc = filemap_fdatawait(inode->i_mapping);
2264 mapping_set_error(inode->i_mapping, rc);
2265 invalidate_remote_inode(inode);
2267 cFYI(1, "Oplock flush inode %p rc %d", inode, rc);
2271 * releasing stale oplock after recent reconnect of smb session using
2272 * a now incorrect file handle is not a data integrity issue but do
2273 * not bother sending an oplock release if session to server still is
2274 * disconnected since oplock already released by the server
2276 if (!cfile->oplock_break_cancelled) {
2277 rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0,
2278 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false);
2279 cFYI(1, "Oplock release rc = %d", rc);
2283 * We might have kicked in before is_valid_oplock_break()
2284 * finished grabbing reference for us. Make sure it's done by
2285 * waiting for cifs_file_list_lock.
2287 spin_lock(&cifs_file_list_lock);
2288 spin_unlock(&cifs_file_list_lock);
2290 cifs_oplock_break_put(cfile);
2293 /* must be called while holding cifs_file_list_lock */
2294 void cifs_oplock_break_get(struct cifsFileInfo *cfile)
2296 cifs_sb_active(cfile->dentry->d_sb);
2297 cifsFileInfo_get(cfile);
2300 void cifs_oplock_break_put(struct cifsFileInfo *cfile)
2302 cifsFileInfo_put(cfile);
2303 cifs_sb_deactive(cfile->dentry->d_sb);
2306 const struct address_space_operations cifs_addr_ops = {
2307 .readpage = cifs_readpage,
2308 .readpages = cifs_readpages,
2309 .writepage = cifs_writepage,
2310 .writepages = cifs_writepages,
2311 .write_begin = cifs_write_begin,
2312 .write_end = cifs_write_end,
2313 .set_page_dirty = __set_page_dirty_nobuffers,
2314 .releasepage = cifs_release_page,
2315 .invalidatepage = cifs_invalidate_page,
2316 /* .sync_page = cifs_sync_page, */
2321 * cifs_readpages requires the server to support a buffer large enough to
2322 * contain the header plus one complete page of data. Otherwise, we need
2323 * to leave cifs_readpages out of the address space operations.
2325 const struct address_space_operations cifs_addr_ops_smallbuf = {
2326 .readpage = cifs_readpage,
2327 .writepage = cifs_writepage,
2328 .writepages = cifs_writepages,
2329 .write_begin = cifs_write_begin,
2330 .write_end = cifs_write_end,
2331 .set_page_dirty = __set_page_dirty_nobuffers,
2332 .releasepage = cifs_release_page,
2333 .invalidatepage = cifs_invalidate_page,
2334 /* .sync_page = cifs_sync_page, */