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 int cifs_posix_open(char *full_path, struct inode **pinode,
108 struct super_block *sb, int mode, unsigned int f_flags,
109 __u32 *poplock, __u16 *pnetfid, int xid)
112 FILE_UNIX_BASIC_INFO *presp_data;
113 __u32 posix_flags = 0;
114 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
115 struct cifs_fattr fattr;
116 struct tcon_link *tlink;
117 struct cifsTconInfo *tcon;
119 cFYI(1, "posix open %s", full_path);
121 presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
122 if (presp_data == NULL)
125 tlink = cifs_sb_tlink(cifs_sb);
131 tcon = tlink_tcon(tlink);
132 mode &= ~current_umask();
134 posix_flags = cifs_posix_convert_flags(f_flags);
135 rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
136 poplock, full_path, cifs_sb->local_nls,
137 cifs_sb->mnt_cifs_flags &
138 CIFS_MOUNT_MAP_SPECIAL_CHR);
139 cifs_put_tlink(tlink);
144 if (presp_data->Type == cpu_to_le32(-1))
145 goto posix_open_ret; /* open ok, caller does qpathinfo */
148 goto posix_open_ret; /* caller does not need info */
150 cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
152 /* get new inode and set it up */
153 if (*pinode == NULL) {
154 cifs_fill_uniqueid(sb, &fattr);
155 *pinode = cifs_iget(sb, &fattr);
161 cifs_fattr_to_inode(*pinode, &fattr);
170 cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
171 struct cifsTconInfo *tcon, unsigned int f_flags, __u32 *poplock,
172 __u16 *pnetfid, int xid)
179 desiredAccess = cifs_convert_flags(f_flags);
181 /*********************************************************************
182 * open flag mapping table:
184 * POSIX Flag CIFS Disposition
185 * ---------- ----------------
186 * O_CREAT FILE_OPEN_IF
187 * O_CREAT | O_EXCL FILE_CREATE
188 * O_CREAT | O_TRUNC FILE_OVERWRITE_IF
189 * O_TRUNC FILE_OVERWRITE
190 * none of the above FILE_OPEN
192 * Note that there is not a direct match between disposition
193 * FILE_SUPERSEDE (ie create whether or not file exists although
194 * O_CREAT | O_TRUNC is similar but truncates the existing
195 * file rather than creating a new file as FILE_SUPERSEDE does
196 * (which uses the attributes / metadata passed in on open call)
198 *? O_SYNC is a reasonable match to CIFS writethrough flag
199 *? and the read write flags match reasonably. O_LARGEFILE
200 *? is irrelevant because largefile support is always used
201 *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
202 * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
203 *********************************************************************/
205 disposition = cifs_get_disposition(f_flags);
207 /* BB pass O_SYNC flag through on file attributes .. BB */
209 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
213 if (tcon->ses->capabilities & CAP_NT_SMBS)
214 rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
215 desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf,
216 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
217 & CIFS_MOUNT_MAP_SPECIAL_CHR);
219 rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
220 desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf,
221 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
222 & CIFS_MOUNT_MAP_SPECIAL_CHR);
228 rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
231 rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
239 struct cifsFileInfo *
240 cifs_new_fileinfo(__u16 fileHandle, struct file *file,
241 struct tcon_link *tlink, __u32 oplock)
243 struct dentry *dentry = file->f_path.dentry;
244 struct inode *inode = dentry->d_inode;
245 struct cifsInodeInfo *pCifsInode = CIFS_I(inode);
246 struct cifsFileInfo *pCifsFile;
248 pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
249 if (pCifsFile == NULL)
252 pCifsFile->count = 1;
253 pCifsFile->netfid = fileHandle;
254 pCifsFile->pid = current->tgid;
255 pCifsFile->uid = current_fsuid();
256 pCifsFile->dentry = dget(dentry);
257 pCifsFile->f_flags = file->f_flags;
258 pCifsFile->invalidHandle = false;
259 pCifsFile->tlink = cifs_get_tlink(tlink);
260 mutex_init(&pCifsFile->fh_mutex);
261 mutex_init(&pCifsFile->lock_mutex);
262 INIT_LIST_HEAD(&pCifsFile->llist);
263 INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
265 spin_lock(&cifs_file_list_lock);
266 list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList));
267 /* if readable file instance put first in list*/
268 if (file->f_mode & FMODE_READ)
269 list_add(&pCifsFile->flist, &pCifsInode->openFileList);
271 list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList);
272 spin_unlock(&cifs_file_list_lock);
274 cifs_set_oplock_level(pCifsInode, oplock);
276 file->private_data = pCifsFile;
281 * Release a reference on the file private data. This may involve closing
282 * the filehandle out on the server. Must be called without holding
283 * cifs_file_list_lock.
285 void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
287 struct inode *inode = cifs_file->dentry->d_inode;
288 struct cifsTconInfo *tcon = tlink_tcon(cifs_file->tlink);
289 struct cifsInodeInfo *cifsi = CIFS_I(inode);
290 struct cifsLockInfo *li, *tmp;
292 spin_lock(&cifs_file_list_lock);
293 if (--cifs_file->count > 0) {
294 spin_unlock(&cifs_file_list_lock);
298 /* remove it from the lists */
299 list_del(&cifs_file->flist);
300 list_del(&cifs_file->tlist);
302 if (list_empty(&cifsi->openFileList)) {
303 cFYI(1, "closing last open instance for inode %p",
304 cifs_file->dentry->d_inode);
305 cifs_set_oplock_level(cifsi, 0);
307 spin_unlock(&cifs_file_list_lock);
309 if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
313 rc = CIFSSMBClose(xid, tcon, cifs_file->netfid);
317 /* Delete any outstanding lock records. We'll lose them when the file
320 mutex_lock(&cifs_file->lock_mutex);
321 list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) {
322 list_del(&li->llist);
325 mutex_unlock(&cifs_file->lock_mutex);
327 cifs_put_tlink(cifs_file->tlink);
328 dput(cifs_file->dentry);
332 int cifs_open(struct inode *inode, struct file *file)
337 struct cifs_sb_info *cifs_sb;
338 struct cifsTconInfo *tcon;
339 struct tcon_link *tlink;
340 struct cifsFileInfo *pCifsFile = NULL;
341 struct cifsInodeInfo *pCifsInode;
342 char *full_path = NULL;
343 bool posix_open_ok = false;
348 cifs_sb = CIFS_SB(inode->i_sb);
349 tlink = cifs_sb_tlink(cifs_sb);
352 return PTR_ERR(tlink);
354 tcon = tlink_tcon(tlink);
356 pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
358 full_path = build_path_from_dentry(file->f_path.dentry);
359 if (full_path == NULL) {
364 cFYI(1, "inode = 0x%p file flags are 0x%x for %s",
365 inode, file->f_flags, full_path);
372 if (!tcon->broken_posix_open && tcon->unix_ext &&
373 (tcon->ses->capabilities & CAP_UNIX) &&
374 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
375 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
376 /* can not refresh inode info since size could be stale */
377 rc = cifs_posix_open(full_path, &inode, inode->i_sb,
378 cifs_sb->mnt_file_mode /* ignored */,
379 file->f_flags, &oplock, &netfid, xid);
381 cFYI(1, "posix open succeeded");
382 posix_open_ok = true;
383 } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
384 if (tcon->ses->serverNOS)
385 cERROR(1, "server %s of type %s returned"
386 " unexpected error on SMB posix open"
387 ", disabling posix open support."
388 " Check if server update available.",
389 tcon->ses->serverName,
390 tcon->ses->serverNOS);
391 tcon->broken_posix_open = true;
392 } else if ((rc != -EIO) && (rc != -EREMOTE) &&
393 (rc != -EOPNOTSUPP)) /* path not found or net err */
395 /* else fallthrough to retry open the old way on network i/o
399 if (!posix_open_ok) {
400 rc = cifs_nt_open(full_path, inode, cifs_sb, tcon,
401 file->f_flags, &oplock, &netfid, xid);
406 pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock);
407 if (pCifsFile == NULL) {
408 CIFSSMBClose(xid, tcon, netfid);
413 cifs_fscache_set_inode_cookie(inode, file);
415 if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
416 /* time to set mode which we can not set earlier due to
417 problems creating new read-only files */
418 struct cifs_unix_set_info_args args = {
419 .mode = inode->i_mode,
422 .ctime = NO_CHANGE_64,
423 .atime = NO_CHANGE_64,
424 .mtime = NO_CHANGE_64,
427 CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid,
434 cifs_put_tlink(tlink);
438 /* Try to reacquire byte range locks that were released when session */
439 /* to server was lost */
440 static int cifs_relock_file(struct cifsFileInfo *cifsFile)
444 /* BB list all locks open on this file and relock */
449 static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush)
454 struct cifs_sb_info *cifs_sb;
455 struct cifsTconInfo *tcon;
456 struct cifsInodeInfo *pCifsInode;
458 char *full_path = NULL;
460 int disposition = FILE_OPEN;
464 mutex_lock(&pCifsFile->fh_mutex);
465 if (!pCifsFile->invalidHandle) {
466 mutex_unlock(&pCifsFile->fh_mutex);
472 inode = pCifsFile->dentry->d_inode;
473 cifs_sb = CIFS_SB(inode->i_sb);
474 tcon = tlink_tcon(pCifsFile->tlink);
476 /* can not grab rename sem here because various ops, including
477 those that already have the rename sem can end up causing writepage
478 to get called and if the server was down that means we end up here,
479 and we can never tell if the caller already has the rename_sem */
480 full_path = build_path_from_dentry(pCifsFile->dentry);
481 if (full_path == NULL) {
483 mutex_unlock(&pCifsFile->fh_mutex);
488 cFYI(1, "inode = 0x%p file flags 0x%x for %s",
489 inode, pCifsFile->f_flags, full_path);
496 if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
497 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
498 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
501 * O_CREAT, O_EXCL and O_TRUNC already had their effect on the
502 * original open. Must mask them off for a reopen.
504 unsigned int oflags = pCifsFile->f_flags &
505 ~(O_CREAT | O_EXCL | O_TRUNC);
507 rc = cifs_posix_open(full_path, NULL, inode->i_sb,
508 cifs_sb->mnt_file_mode /* ignored */,
509 oflags, &oplock, &netfid, xid);
511 cFYI(1, "posix reopen succeeded");
514 /* fallthrough to retry open the old way on errors, especially
515 in the reconnect path it is important to retry hard */
518 desiredAccess = cifs_convert_flags(pCifsFile->f_flags);
520 /* Can not refresh inode by passing in file_info buf to be returned
521 by SMBOpen and then calling get_inode_info with returned buf
522 since file might have write behind data that needs to be flushed
523 and server version of file size can be stale. If we knew for sure
524 that inode was not dirty locally we could do this */
526 rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess,
527 CREATE_NOT_DIR, &netfid, &oplock, NULL,
528 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
529 CIFS_MOUNT_MAP_SPECIAL_CHR);
531 mutex_unlock(&pCifsFile->fh_mutex);
532 cFYI(1, "cifs_open returned 0x%x", rc);
533 cFYI(1, "oplock: %d", oplock);
534 goto reopen_error_exit;
538 pCifsFile->netfid = netfid;
539 pCifsFile->invalidHandle = false;
540 mutex_unlock(&pCifsFile->fh_mutex);
541 pCifsInode = CIFS_I(inode);
544 rc = filemap_write_and_wait(inode->i_mapping);
545 mapping_set_error(inode->i_mapping, rc);
548 rc = cifs_get_inode_info_unix(&inode,
549 full_path, inode->i_sb, xid);
551 rc = cifs_get_inode_info(&inode,
552 full_path, NULL, inode->i_sb,
554 } /* else we are writing out data to server already
555 and could deadlock if we tried to flush data, and
556 since we do not know if we have data that would
557 invalidate the current end of file on the server
558 we can not go to the server to get the new inod
561 cifs_set_oplock_level(pCifsInode, oplock);
563 cifs_relock_file(pCifsFile);
571 int cifs_close(struct inode *inode, struct file *file)
573 cifsFileInfo_put(file->private_data);
574 file->private_data = NULL;
576 /* return code from the ->release op is always ignored */
580 int cifs_closedir(struct inode *inode, struct file *file)
584 struct cifsFileInfo *pCFileStruct = file->private_data;
587 cFYI(1, "Closedir inode = 0x%p", inode);
592 struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink);
594 cFYI(1, "Freeing private data in close dir");
595 spin_lock(&cifs_file_list_lock);
596 if (!pCFileStruct->srch_inf.endOfSearch &&
597 !pCFileStruct->invalidHandle) {
598 pCFileStruct->invalidHandle = true;
599 spin_unlock(&cifs_file_list_lock);
600 rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
601 cFYI(1, "Closing uncompleted readdir with rc %d",
603 /* not much we can do if it fails anyway, ignore rc */
606 spin_unlock(&cifs_file_list_lock);
607 ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
609 cFYI(1, "closedir free smb buf in srch struct");
610 pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
611 if (pCFileStruct->srch_inf.smallBuf)
612 cifs_small_buf_release(ptmp);
614 cifs_buf_release(ptmp);
616 cifs_put_tlink(pCFileStruct->tlink);
617 kfree(file->private_data);
618 file->private_data = NULL;
620 /* BB can we lock the filestruct while this is going on? */
625 static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
626 __u64 offset, __u8 lockType)
628 struct cifsLockInfo *li =
629 kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
635 mutex_lock(&fid->lock_mutex);
636 list_add(&li->llist, &fid->llist);
637 mutex_unlock(&fid->lock_mutex);
641 int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
647 bool wait_flag = false;
648 struct cifs_sb_info *cifs_sb;
649 struct cifsTconInfo *tcon;
651 __u8 lockType = LOCKING_ANDX_LARGE_FILES;
652 bool posix_locking = 0;
654 length = 1 + pfLock->fl_end - pfLock->fl_start;
658 cFYI(1, "Lock parm: 0x%x flockflags: "
659 "0x%x flocktype: 0x%x start: %lld end: %lld",
660 cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
663 if (pfLock->fl_flags & FL_POSIX)
665 if (pfLock->fl_flags & FL_FLOCK)
667 if (pfLock->fl_flags & FL_SLEEP) {
668 cFYI(1, "Blocking lock");
671 if (pfLock->fl_flags & FL_ACCESS)
672 cFYI(1, "Process suspended by mandatory locking - "
673 "not implemented yet");
674 if (pfLock->fl_flags & FL_LEASE)
675 cFYI(1, "Lease on file - not implemented yet");
676 if (pfLock->fl_flags &
677 (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
678 cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags);
680 if (pfLock->fl_type == F_WRLCK) {
683 } else if (pfLock->fl_type == F_UNLCK) {
686 /* Check if unlock includes more than
688 } else if (pfLock->fl_type == F_RDLCK) {
690 lockType |= LOCKING_ANDX_SHARED_LOCK;
692 } else if (pfLock->fl_type == F_EXLCK) {
695 } else if (pfLock->fl_type == F_SHLCK) {
697 lockType |= LOCKING_ANDX_SHARED_LOCK;
700 cFYI(1, "Unknown type of lock");
702 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
703 tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink);
704 netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
706 if ((tcon->ses->capabilities & CAP_UNIX) &&
707 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
708 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
710 /* BB add code here to normalize offset and length to
711 account for negative length which we can not accept over the
716 if (lockType & LOCKING_ANDX_SHARED_LOCK)
717 posix_lock_type = CIFS_RDLCK;
719 posix_lock_type = CIFS_WRLCK;
720 rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */,
722 posix_lock_type, wait_flag);
727 /* BB we could chain these into one lock request BB */
728 rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start,
729 0, 1, lockType, 0 /* wait flag */, 0);
731 rc = CIFSSMBLock(xid, tcon, netfid, length,
732 pfLock->fl_start, 1 /* numUnlock */ ,
733 0 /* numLock */ , lockType,
734 0 /* wait flag */, 0);
735 pfLock->fl_type = F_UNLCK;
737 cERROR(1, "Error unlocking previously locked "
738 "range %d during test of lock", rc);
742 /* if rc == ERR_SHARING_VIOLATION ? */
745 if (lockType & LOCKING_ANDX_SHARED_LOCK) {
746 pfLock->fl_type = F_WRLCK;
748 rc = CIFSSMBLock(xid, tcon, netfid, length,
749 pfLock->fl_start, 0, 1,
750 lockType | LOCKING_ANDX_SHARED_LOCK,
751 0 /* wait flag */, 0);
753 rc = CIFSSMBLock(xid, tcon, netfid,
754 length, pfLock->fl_start, 1, 0,
756 LOCKING_ANDX_SHARED_LOCK,
757 0 /* wait flag */, 0);
758 pfLock->fl_type = F_RDLCK;
760 cERROR(1, "Error unlocking "
761 "previously locked range %d "
762 "during test of lock", rc);
765 pfLock->fl_type = F_WRLCK;
775 if (!numLock && !numUnlock) {
776 /* if no lock or unlock then nothing
777 to do since we do not know what it is */
784 if (lockType & LOCKING_ANDX_SHARED_LOCK)
785 posix_lock_type = CIFS_RDLCK;
787 posix_lock_type = CIFS_WRLCK;
790 posix_lock_type = CIFS_UNLCK;
792 rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */,
794 posix_lock_type, wait_flag);
796 struct cifsFileInfo *fid = file->private_data;
799 rc = CIFSSMBLock(xid, tcon, netfid, length,
800 pfLock->fl_start, 0, numLock, lockType,
804 /* For Windows locks we must store them. */
805 rc = store_file_lock(fid, length,
806 pfLock->fl_start, lockType);
808 } else if (numUnlock) {
809 /* For each stored lock that this unlock overlaps
810 completely, unlock it. */
812 struct cifsLockInfo *li, *tmp;
815 mutex_lock(&fid->lock_mutex);
816 list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
817 if (pfLock->fl_start <= li->offset &&
818 (pfLock->fl_start + length) >=
819 (li->offset + li->length)) {
820 stored_rc = CIFSSMBLock(xid, tcon,
827 list_del(&li->llist);
832 mutex_unlock(&fid->lock_mutex);
836 if (pfLock->fl_flags & FL_POSIX)
837 posix_lock_file_wait(file, pfLock);
843 * Set the timeout on write requests past EOF. For some servers (Windows)
844 * these calls can be very long.
846 * If we're writing >10M past the EOF we give a 180s timeout. Anything less
847 * than that gets a 45s timeout. Writes not past EOF get 15s timeouts.
848 * The 10M cutoff is totally arbitrary. A better scheme for this would be
849 * welcome if someone wants to suggest one.
851 * We may be able to do a better job with this if there were some way to
852 * declare that a file should be sparse.
855 cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset)
857 if (offset <= cifsi->server_eof)
859 else if (offset > (cifsi->server_eof + (10 * 1024 * 1024)))
860 return CIFS_VLONG_OP;
865 /* update the file size (if needed) after a write */
867 cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
868 unsigned int bytes_written)
870 loff_t end_of_write = offset + bytes_written;
872 if (end_of_write > cifsi->server_eof)
873 cifsi->server_eof = end_of_write;
876 ssize_t cifs_user_write(struct file *file, const char __user *write_data,
877 size_t write_size, loff_t *poffset)
879 struct inode *inode = file->f_path.dentry->d_inode;
881 unsigned int bytes_written = 0;
882 unsigned int total_written;
883 struct cifs_sb_info *cifs_sb;
884 struct cifsTconInfo *pTcon;
886 struct cifsFileInfo *open_file;
887 struct cifsInodeInfo *cifsi = CIFS_I(inode);
889 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
891 /* cFYI(1, " write %d bytes to offset %lld of %s", write_size,
892 *poffset, file->f_path.dentry->d_name.name); */
894 if (file->private_data == NULL)
897 open_file = file->private_data;
898 pTcon = tlink_tcon(open_file->tlink);
900 rc = generic_write_checks(file, poffset, &write_size, 0);
906 long_op = cifs_write_timeout(cifsi, *poffset);
907 for (total_written = 0; write_size > total_written;
908 total_written += bytes_written) {
910 while (rc == -EAGAIN) {
911 if (file->private_data == NULL) {
912 /* file has been closed on us */
914 /* if we have gotten here we have written some data
915 and blocked, and the file has been freed on us while
916 we blocked so return what we managed to write */
917 return total_written;
919 if (open_file->invalidHandle) {
920 /* we could deadlock if we called
921 filemap_fdatawait from here so tell
922 reopen_file not to flush data to server
924 rc = cifs_reopen_file(open_file, false);
929 rc = CIFSSMBWrite(xid, pTcon,
931 min_t(const int, cifs_sb->wsize,
932 write_size - total_written),
933 *poffset, &bytes_written,
934 NULL, write_data + total_written, long_op);
936 if (rc || (bytes_written == 0)) {
944 cifs_update_eof(cifsi, *poffset, bytes_written);
945 *poffset += bytes_written;
947 long_op = CIFS_STD_OP; /* subsequent writes fast -
948 15 seconds is plenty */
951 cifs_stats_bytes_written(pTcon, total_written);
953 /* Do not update local mtime - server will set its actual value on write
954 * inode->i_ctime = inode->i_mtime =
955 * current_fs_time(inode->i_sb);*/
956 if (total_written > 0) {
957 spin_lock(&inode->i_lock);
958 if (*poffset > inode->i_size)
959 i_size_write(inode, *poffset);
960 spin_unlock(&inode->i_lock);
962 mark_inode_dirty_sync(inode);
965 return total_written;
968 static ssize_t cifs_write(struct cifsFileInfo *open_file,
969 const char *write_data, size_t write_size,
973 unsigned int bytes_written = 0;
974 unsigned int total_written;
975 struct cifs_sb_info *cifs_sb;
976 struct cifsTconInfo *pTcon;
978 struct dentry *dentry = open_file->dentry;
979 struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode);
981 cifs_sb = CIFS_SB(dentry->d_sb);
983 cFYI(1, "write %zd bytes to offset %lld of %s", write_size,
984 *poffset, dentry->d_name.name);
986 pTcon = tlink_tcon(open_file->tlink);
990 long_op = cifs_write_timeout(cifsi, *poffset);
991 for (total_written = 0; write_size > total_written;
992 total_written += bytes_written) {
994 while (rc == -EAGAIN) {
995 if (open_file->invalidHandle) {
996 /* we could deadlock if we called
997 filemap_fdatawait from here so tell
998 reopen_file not to flush data to
1000 rc = cifs_reopen_file(open_file, false);
1004 if (experimEnabled || (pTcon->ses->server &&
1005 ((pTcon->ses->server->secMode &
1006 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
1011 len = min((size_t)cifs_sb->wsize,
1012 write_size - total_written);
1013 /* iov[0] is reserved for smb header */
1014 iov[1].iov_base = (char *)write_data +
1016 iov[1].iov_len = len;
1017 rc = CIFSSMBWrite2(xid, pTcon,
1018 open_file->netfid, len,
1019 *poffset, &bytes_written,
1022 rc = CIFSSMBWrite(xid, pTcon,
1024 min_t(const int, cifs_sb->wsize,
1025 write_size - total_written),
1026 *poffset, &bytes_written,
1027 write_data + total_written,
1030 if (rc || (bytes_written == 0)) {
1038 cifs_update_eof(cifsi, *poffset, bytes_written);
1039 *poffset += bytes_written;
1041 long_op = CIFS_STD_OP; /* subsequent writes fast -
1042 15 seconds is plenty */
1045 cifs_stats_bytes_written(pTcon, total_written);
1047 if (total_written > 0) {
1048 spin_lock(&dentry->d_inode->i_lock);
1049 if (*poffset > dentry->d_inode->i_size)
1050 i_size_write(dentry->d_inode, *poffset);
1051 spin_unlock(&dentry->d_inode->i_lock);
1053 mark_inode_dirty_sync(dentry->d_inode);
1055 return total_written;
1058 struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
1061 struct cifsFileInfo *open_file = NULL;
1062 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1064 /* only filter by fsuid on multiuser mounts */
1065 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1068 spin_lock(&cifs_file_list_lock);
1069 /* we could simply get the first_list_entry since write-only entries
1070 are always at the end of the list but since the first entry might
1071 have a close pending, we go through the whole list */
1072 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1073 if (fsuid_only && open_file->uid != current_fsuid())
1075 if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
1076 if (!open_file->invalidHandle) {
1077 /* found a good file */
1078 /* lock it so it will not be closed on us */
1079 cifsFileInfo_get(open_file);
1080 spin_unlock(&cifs_file_list_lock);
1082 } /* else might as well continue, and look for
1083 another, or simply have the caller reopen it
1084 again rather than trying to fix this handle */
1085 } else /* write only file */
1086 break; /* write only files are last so must be done */
1088 spin_unlock(&cifs_file_list_lock);
1092 struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
1095 struct cifsFileInfo *open_file;
1096 struct cifs_sb_info *cifs_sb;
1097 bool any_available = false;
1100 /* Having a null inode here (because mapping->host was set to zero by
1101 the VFS or MM) should not happen but we had reports of on oops (due to
1102 it being zero) during stress testcases so we need to check for it */
1104 if (cifs_inode == NULL) {
1105 cERROR(1, "Null inode passed to cifs_writeable_file");
1110 cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
1112 /* only filter by fsuid on multiuser mounts */
1113 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
1116 spin_lock(&cifs_file_list_lock);
1118 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1119 if (!any_available && open_file->pid != current->tgid)
1121 if (fsuid_only && open_file->uid != current_fsuid())
1123 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
1124 cifsFileInfo_get(open_file);
1126 if (!open_file->invalidHandle) {
1127 /* found a good writable file */
1128 spin_unlock(&cifs_file_list_lock);
1132 spin_unlock(&cifs_file_list_lock);
1134 /* Had to unlock since following call can block */
1135 rc = cifs_reopen_file(open_file, false);
1139 /* if it fails, try another handle if possible */
1140 cFYI(1, "wp failed on reopen file");
1141 cifsFileInfo_put(open_file);
1143 spin_lock(&cifs_file_list_lock);
1145 /* else we simply continue to the next entry. Thus
1146 we do not loop on reopen errors. If we
1147 can not reopen the file, for example if we
1148 reconnected to a server with another client
1149 racing to delete or lock the file we would not
1150 make progress if we restarted before the beginning
1151 of the loop here. */
1154 /* couldn't find useable FH with same pid, try any available */
1155 if (!any_available) {
1156 any_available = true;
1157 goto refind_writable;
1159 spin_unlock(&cifs_file_list_lock);
1163 static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
1165 struct address_space *mapping = page->mapping;
1166 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1169 int bytes_written = 0;
1170 struct cifs_sb_info *cifs_sb;
1171 struct inode *inode;
1172 struct cifsFileInfo *open_file;
1174 if (!mapping || !mapping->host)
1177 inode = page->mapping->host;
1178 cifs_sb = CIFS_SB(inode->i_sb);
1180 offset += (loff_t)from;
1181 write_data = kmap(page);
1184 if ((to > PAGE_CACHE_SIZE) || (from > to)) {
1189 /* racing with truncate? */
1190 if (offset > mapping->host->i_size) {
1192 return 0; /* don't care */
1195 /* check to make sure that we are not extending the file */
1196 if (mapping->host->i_size - offset < (loff_t)to)
1197 to = (unsigned)(mapping->host->i_size - offset);
1199 open_file = find_writable_file(CIFS_I(mapping->host), false);
1201 bytes_written = cifs_write(open_file, write_data,
1202 to - from, &offset);
1203 cifsFileInfo_put(open_file);
1204 /* Does mm or vfs already set times? */
1205 inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
1206 if ((bytes_written > 0) && (offset))
1208 else if (bytes_written < 0)
1211 cFYI(1, "No writeable filehandles for inode");
1219 static int cifs_writepages(struct address_space *mapping,
1220 struct writeback_control *wbc)
1222 unsigned int bytes_to_write;
1223 unsigned int bytes_written;
1224 struct cifs_sb_info *cifs_sb;
1228 int range_whole = 0;
1235 struct cifsFileInfo *open_file;
1236 struct cifsTconInfo *tcon;
1237 struct cifsInodeInfo *cifsi = CIFS_I(mapping->host);
1239 struct pagevec pvec;
1244 cifs_sb = CIFS_SB(mapping->host->i_sb);
1247 * If wsize is smaller that the page cache size, default to writing
1248 * one page at a time via cifs_writepage
1250 if (cifs_sb->wsize < PAGE_CACHE_SIZE)
1251 return generic_writepages(mapping, wbc);
1253 iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL);
1255 return generic_writepages(mapping, wbc);
1258 * if there's no open file, then this is likely to fail too,
1259 * but it'll at least handle the return. Maybe it should be
1262 open_file = find_writable_file(CIFS_I(mapping->host), false);
1265 return generic_writepages(mapping, wbc);
1268 tcon = tlink_tcon(open_file->tlink);
1269 if (!experimEnabled && tcon->ses->server->secMode &
1270 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
1271 cifsFileInfo_put(open_file);
1273 return generic_writepages(mapping, wbc);
1275 cifsFileInfo_put(open_file);
1279 pagevec_init(&pvec, 0);
1280 if (wbc->range_cyclic) {
1281 index = mapping->writeback_index; /* Start from prev offset */
1284 index = wbc->range_start >> PAGE_CACHE_SHIFT;
1285 end = wbc->range_end >> PAGE_CACHE_SHIFT;
1286 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1291 while (!done && (index <= end) &&
1292 (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
1293 PAGECACHE_TAG_DIRTY,
1294 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) {
1303 for (i = 0; i < nr_pages; i++) {
1304 page = pvec.pages[i];
1306 * At this point we hold neither mapping->tree_lock nor
1307 * lock on the page itself: the page may be truncated or
1308 * invalidated (changing page->mapping to NULL), or even
1309 * swizzled back from swapper_space to tmpfs file
1315 else if (!trylock_page(page))
1318 if (unlikely(page->mapping != mapping)) {
1323 if (!wbc->range_cyclic && page->index > end) {
1329 if (next && (page->index != next)) {
1330 /* Not next consecutive page */
1335 if (wbc->sync_mode != WB_SYNC_NONE)
1336 wait_on_page_writeback(page);
1338 if (PageWriteback(page) ||
1339 !clear_page_dirty_for_io(page)) {
1345 * This actually clears the dirty bit in the radix tree.
1346 * See cifs_writepage() for more commentary.
1348 set_page_writeback(page);
1350 if (page_offset(page) >= mapping->host->i_size) {
1353 end_page_writeback(page);
1358 * BB can we get rid of this? pages are held by pvec
1360 page_cache_get(page);
1362 len = min(mapping->host->i_size - page_offset(page),
1363 (loff_t)PAGE_CACHE_SIZE);
1365 /* reserve iov[0] for the smb header */
1367 iov[n_iov].iov_base = kmap(page);
1368 iov[n_iov].iov_len = len;
1369 bytes_to_write += len;
1373 offset = page_offset(page);
1375 next = page->index + 1;
1376 if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize)
1381 open_file = find_writable_file(CIFS_I(mapping->host),
1384 cERROR(1, "No writable handles for inode");
1387 long_op = cifs_write_timeout(cifsi, offset);
1388 rc = CIFSSMBWrite2(xid, tcon, open_file->netfid,
1389 bytes_to_write, offset,
1390 &bytes_written, iov, n_iov,
1392 cifsFileInfo_put(open_file);
1395 cFYI(1, "Write2 rc=%d, wrote=%u", rc, bytes_written);
1398 * For now, treat a short write as if nothing got
1399 * written. A zero length write however indicates
1400 * ENOSPC or EFBIG. We have no way to know which
1401 * though, so call it ENOSPC for now. EFBIG would
1402 * get translated to AS_EIO anyway.
1404 * FIXME: make it take into account the data that did
1408 if (bytes_written == 0)
1410 else if (bytes_written < bytes_to_write)
1414 /* retry on data-integrity flush */
1415 if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN)
1418 /* fix the stats and EOF */
1419 if (bytes_written > 0) {
1420 cifs_stats_bytes_written(tcon, bytes_written);
1421 cifs_update_eof(cifsi, offset, bytes_written);
1424 for (i = 0; i < n_iov; i++) {
1425 page = pvec.pages[first + i];
1426 /* on retryable write error, redirty page */
1428 redirty_page_for_writepage(wbc, page);
1433 end_page_writeback(page);
1434 page_cache_release(page);
1438 mapping_set_error(mapping, rc);
1442 if ((wbc->nr_to_write -= n_iov) <= 0)
1446 /* Need to re-find the pages we skipped */
1447 index = pvec.pages[0]->index + 1;
1449 pagevec_release(&pvec);
1451 if (!scanned && !done) {
1453 * We hit the last page and there is more work to be done: wrap
1454 * back to the start of the file
1460 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1461 mapping->writeback_index = index;
1468 static int cifs_writepage(struct page *page, struct writeback_control *wbc)
1474 /* BB add check for wbc flags */
1475 page_cache_get(page);
1476 if (!PageUptodate(page))
1477 cFYI(1, "ppw - page not up to date");
1480 * Set the "writeback" flag, and clear "dirty" in the radix tree.
1482 * A writepage() implementation always needs to do either this,
1483 * or re-dirty the page with "redirty_page_for_writepage()" in
1484 * the case of a failure.
1486 * Just unlocking the page will cause the radix tree tag-bits
1487 * to fail to update with the state of the page correctly.
1489 set_page_writeback(page);
1490 rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
1491 SetPageUptodate(page); /* BB add check for error and Clearuptodate? */
1493 end_page_writeback(page);
1494 page_cache_release(page);
1499 static int cifs_write_end(struct file *file, struct address_space *mapping,
1500 loff_t pos, unsigned len, unsigned copied,
1501 struct page *page, void *fsdata)
1504 struct inode *inode = mapping->host;
1506 cFYI(1, "write_end for page %p from pos %lld with %d bytes",
1509 if (PageChecked(page)) {
1511 SetPageUptodate(page);
1512 ClearPageChecked(page);
1513 } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
1514 SetPageUptodate(page);
1516 if (!PageUptodate(page)) {
1518 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
1522 /* this is probably better than directly calling
1523 partialpage_write since in this function the file handle is
1524 known which we might as well leverage */
1525 /* BB check if anything else missing out of ppw
1526 such as updating last write time */
1527 page_data = kmap(page);
1528 rc = cifs_write(file->private_data, page_data + offset,
1530 /* if (rc < 0) should we set writebehind rc? */
1537 set_page_dirty(page);
1541 spin_lock(&inode->i_lock);
1542 if (pos > inode->i_size)
1543 i_size_write(inode, pos);
1544 spin_unlock(&inode->i_lock);
1548 page_cache_release(page);
1553 int cifs_fsync(struct file *file, int datasync)
1557 struct cifsTconInfo *tcon;
1558 struct cifsFileInfo *smbfile = file->private_data;
1559 struct inode *inode = file->f_path.dentry->d_inode;
1563 cFYI(1, "Sync file - name: %s datasync: 0x%x",
1564 file->f_path.dentry->d_name.name, datasync);
1566 rc = filemap_write_and_wait(inode->i_mapping);
1568 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1570 tcon = tlink_tcon(smbfile->tlink);
1571 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
1572 rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
1579 /* static void cifs_sync_page(struct page *page)
1581 struct address_space *mapping;
1582 struct inode *inode;
1583 unsigned long index = page->index;
1584 unsigned int rpages = 0;
1587 cFYI(1, "sync page %p", page);
1588 mapping = page->mapping;
1591 inode = mapping->host;
1595 /* fill in rpages then
1596 result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
1598 /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index);
1608 * As file closes, flush all cached write data for this inode checking
1609 * for write behind errors.
1611 int cifs_flush(struct file *file, fl_owner_t id)
1613 struct inode *inode = file->f_path.dentry->d_inode;
1616 if (file->f_mode & FMODE_WRITE)
1617 rc = filemap_write_and_wait(inode->i_mapping);
1619 cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc);
1624 ssize_t cifs_user_read(struct file *file, char __user *read_data,
1625 size_t read_size, loff_t *poffset)
1628 unsigned int bytes_read = 0;
1629 unsigned int total_read = 0;
1630 unsigned int current_read_size;
1631 struct cifs_sb_info *cifs_sb;
1632 struct cifsTconInfo *pTcon;
1634 struct cifsFileInfo *open_file;
1635 char *smb_read_data;
1636 char __user *current_offset;
1637 struct smb_com_read_rsp *pSMBr;
1640 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1642 if (file->private_data == NULL) {
1647 open_file = file->private_data;
1648 pTcon = tlink_tcon(open_file->tlink);
1650 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
1651 cFYI(1, "attempting read on write only file instance");
1653 for (total_read = 0, current_offset = read_data;
1654 read_size > total_read;
1655 total_read += bytes_read, current_offset += bytes_read) {
1656 current_read_size = min_t(const int, read_size - total_read,
1659 smb_read_data = NULL;
1660 while (rc == -EAGAIN) {
1661 int buf_type = CIFS_NO_BUFFER;
1662 if (open_file->invalidHandle) {
1663 rc = cifs_reopen_file(open_file, true);
1667 rc = CIFSSMBRead(xid, pTcon,
1669 current_read_size, *poffset,
1670 &bytes_read, &smb_read_data,
1672 pSMBr = (struct smb_com_read_rsp *)smb_read_data;
1673 if (smb_read_data) {
1674 if (copy_to_user(current_offset,
1676 4 /* RFC1001 length field */ +
1677 le16_to_cpu(pSMBr->DataOffset),
1681 if (buf_type == CIFS_SMALL_BUFFER)
1682 cifs_small_buf_release(smb_read_data);
1683 else if (buf_type == CIFS_LARGE_BUFFER)
1684 cifs_buf_release(smb_read_data);
1685 smb_read_data = NULL;
1688 if (rc || (bytes_read == 0)) {
1696 cifs_stats_bytes_read(pTcon, bytes_read);
1697 *poffset += bytes_read;
1705 static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
1709 unsigned int bytes_read = 0;
1710 unsigned int total_read;
1711 unsigned int current_read_size;
1712 struct cifs_sb_info *cifs_sb;
1713 struct cifsTconInfo *pTcon;
1715 char *current_offset;
1716 struct cifsFileInfo *open_file;
1717 int buf_type = CIFS_NO_BUFFER;
1720 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1722 if (file->private_data == NULL) {
1727 open_file = file->private_data;
1728 pTcon = tlink_tcon(open_file->tlink);
1730 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
1731 cFYI(1, "attempting read on write only file instance");
1733 for (total_read = 0, current_offset = read_data;
1734 read_size > total_read;
1735 total_read += bytes_read, current_offset += bytes_read) {
1736 current_read_size = min_t(const int, read_size - total_read,
1738 /* For windows me and 9x we do not want to request more
1739 than it negotiated since it will refuse the read then */
1741 !(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
1742 current_read_size = min_t(const int, current_read_size,
1743 pTcon->ses->server->maxBuf - 128);
1746 while (rc == -EAGAIN) {
1747 if (open_file->invalidHandle) {
1748 rc = cifs_reopen_file(open_file, true);
1752 rc = CIFSSMBRead(xid, pTcon,
1754 current_read_size, *poffset,
1755 &bytes_read, ¤t_offset,
1758 if (rc || (bytes_read == 0)) {
1766 cifs_stats_bytes_read(pTcon, total_read);
1767 *poffset += bytes_read;
1774 int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
1779 rc = cifs_revalidate_file(file);
1781 cFYI(1, "Validation prior to mmap failed, error=%d", rc);
1785 rc = generic_file_mmap(file, vma);
1791 static void cifs_copy_cache_pages(struct address_space *mapping,
1792 struct list_head *pages, int bytes_read, char *data)
1797 while (bytes_read > 0) {
1798 if (list_empty(pages))
1801 page = list_entry(pages->prev, struct page, lru);
1802 list_del(&page->lru);
1804 if (add_to_page_cache_lru(page, mapping, page->index,
1806 page_cache_release(page);
1807 cFYI(1, "Add page cache failed");
1808 data += PAGE_CACHE_SIZE;
1809 bytes_read -= PAGE_CACHE_SIZE;
1812 page_cache_release(page);
1814 target = kmap_atomic(page, KM_USER0);
1816 if (PAGE_CACHE_SIZE > bytes_read) {
1817 memcpy(target, data, bytes_read);
1818 /* zero the tail end of this partial page */
1819 memset(target + bytes_read, 0,
1820 PAGE_CACHE_SIZE - bytes_read);
1823 memcpy(target, data, PAGE_CACHE_SIZE);
1824 bytes_read -= PAGE_CACHE_SIZE;
1826 kunmap_atomic(target, KM_USER0);
1828 flush_dcache_page(page);
1829 SetPageUptodate(page);
1831 data += PAGE_CACHE_SIZE;
1833 /* add page to FS-Cache */
1834 cifs_readpage_to_fscache(mapping->host, page);
1839 static int cifs_readpages(struct file *file, struct address_space *mapping,
1840 struct list_head *page_list, unsigned num_pages)
1846 struct cifs_sb_info *cifs_sb;
1847 struct cifsTconInfo *pTcon;
1848 unsigned int bytes_read = 0;
1849 unsigned int read_size, i;
1850 char *smb_read_data = NULL;
1851 struct smb_com_read_rsp *pSMBr;
1852 struct cifsFileInfo *open_file;
1853 int buf_type = CIFS_NO_BUFFER;
1856 if (file->private_data == NULL) {
1861 open_file = file->private_data;
1862 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1863 pTcon = tlink_tcon(open_file->tlink);
1866 * Reads as many pages as possible from fscache. Returns -ENOBUFS
1867 * immediately if the cookie is negative
1869 rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
1874 cFYI(DBG2, "rpages: num pages %d", num_pages);
1875 for (i = 0; i < num_pages; ) {
1876 unsigned contig_pages;
1877 struct page *tmp_page;
1878 unsigned long expected_index;
1880 if (list_empty(page_list))
1883 page = list_entry(page_list->prev, struct page, lru);
1884 offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1886 /* count adjacent pages that we will read into */
1889 list_entry(page_list->prev, struct page, lru)->index;
1890 list_for_each_entry_reverse(tmp_page, page_list, lru) {
1891 if (tmp_page->index == expected_index) {
1897 if (contig_pages + i > num_pages)
1898 contig_pages = num_pages - i;
1900 /* for reads over a certain size could initiate async
1903 read_size = contig_pages * PAGE_CACHE_SIZE;
1904 /* Read size needs to be in multiples of one page */
1905 read_size = min_t(const unsigned int, read_size,
1906 cifs_sb->rsize & PAGE_CACHE_MASK);
1907 cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d",
1908 read_size, contig_pages);
1910 while (rc == -EAGAIN) {
1911 if (open_file->invalidHandle) {
1912 rc = cifs_reopen_file(open_file, true);
1917 rc = CIFSSMBRead(xid, pTcon,
1920 &bytes_read, &smb_read_data,
1922 /* BB more RC checks ? */
1923 if (rc == -EAGAIN) {
1924 if (smb_read_data) {
1925 if (buf_type == CIFS_SMALL_BUFFER)
1926 cifs_small_buf_release(smb_read_data);
1927 else if (buf_type == CIFS_LARGE_BUFFER)
1928 cifs_buf_release(smb_read_data);
1929 smb_read_data = NULL;
1933 if ((rc < 0) || (smb_read_data == NULL)) {
1934 cFYI(1, "Read error in readpages: %d", rc);
1936 } else if (bytes_read > 0) {
1937 task_io_account_read(bytes_read);
1938 pSMBr = (struct smb_com_read_rsp *)smb_read_data;
1939 cifs_copy_cache_pages(mapping, page_list, bytes_read,
1940 smb_read_data + 4 /* RFC1001 hdr */ +
1941 le16_to_cpu(pSMBr->DataOffset));
1943 i += bytes_read >> PAGE_CACHE_SHIFT;
1944 cifs_stats_bytes_read(pTcon, bytes_read);
1945 if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) {
1946 i++; /* account for partial page */
1948 /* server copy of file can have smaller size
1950 /* BB do we need to verify this common case ?
1951 this case is ok - if we are at server EOF
1952 we will hit it on next read */
1957 cFYI(1, "No bytes read (%d) at offset %lld . "
1958 "Cleaning remaining pages from readahead list",
1959 bytes_read, offset);
1960 /* BB turn off caching and do new lookup on
1961 file size at server? */
1964 if (smb_read_data) {
1965 if (buf_type == CIFS_SMALL_BUFFER)
1966 cifs_small_buf_release(smb_read_data);
1967 else if (buf_type == CIFS_LARGE_BUFFER)
1968 cifs_buf_release(smb_read_data);
1969 smb_read_data = NULL;
1974 /* need to free smb_read_data buf before exit */
1975 if (smb_read_data) {
1976 if (buf_type == CIFS_SMALL_BUFFER)
1977 cifs_small_buf_release(smb_read_data);
1978 else if (buf_type == CIFS_LARGE_BUFFER)
1979 cifs_buf_release(smb_read_data);
1980 smb_read_data = NULL;
1988 static int cifs_readpage_worker(struct file *file, struct page *page,
1994 /* Is the page cached? */
1995 rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page);
1999 page_cache_get(page);
2000 read_data = kmap(page);
2001 /* for reads over a certain size could initiate async read ahead */
2003 rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
2008 cFYI(1, "Bytes read %d", rc);
2010 file->f_path.dentry->d_inode->i_atime =
2011 current_fs_time(file->f_path.dentry->d_inode->i_sb);
2013 if (PAGE_CACHE_SIZE > rc)
2014 memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
2016 flush_dcache_page(page);
2017 SetPageUptodate(page);
2019 /* send this page to the cache */
2020 cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page);
2026 page_cache_release(page);
2032 static int cifs_readpage(struct file *file, struct page *page)
2034 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
2040 if (file->private_data == NULL) {
2046 cFYI(1, "readpage %p at offset %d 0x%x\n",
2047 page, (int)offset, (int)offset);
2049 rc = cifs_readpage_worker(file, page, &offset);
2057 static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
2059 struct cifsFileInfo *open_file;
2061 spin_lock(&cifs_file_list_lock);
2062 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
2063 if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
2064 spin_unlock(&cifs_file_list_lock);
2068 spin_unlock(&cifs_file_list_lock);
2072 /* We do not want to update the file size from server for inodes
2073 open for write - to avoid races with writepage extending
2074 the file - in the future we could consider allowing
2075 refreshing the inode only on increases in the file size
2076 but this is tricky to do without racing with writebehind
2077 page caching in the current Linux kernel design */
2078 bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
2083 if (is_inode_writable(cifsInode)) {
2084 /* This inode is open for write at least once */
2085 struct cifs_sb_info *cifs_sb;
2087 cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
2088 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
2089 /* since no page cache to corrupt on directio
2090 we can change size safely */
2094 if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
2102 static int cifs_write_begin(struct file *file, struct address_space *mapping,
2103 loff_t pos, unsigned len, unsigned flags,
2104 struct page **pagep, void **fsdata)
2106 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
2107 loff_t offset = pos & (PAGE_CACHE_SIZE - 1);
2108 loff_t page_start = pos & PAGE_MASK;
2113 cFYI(1, "write_begin from %lld len %d", (long long)pos, len);
2115 page = grab_cache_page_write_begin(mapping, index, flags);
2121 if (PageUptodate(page))
2125 * If we write a full page it will be up to date, no need to read from
2126 * the server. If the write is short, we'll end up doing a sync write
2129 if (len == PAGE_CACHE_SIZE)
2133 * optimize away the read when we have an oplock, and we're not
2134 * expecting to use any of the data we'd be reading in. That
2135 * is, when the page lies beyond the EOF, or straddles the EOF
2136 * and the write will cover all of the existing data.
2138 if (CIFS_I(mapping->host)->clientCanCacheRead) {
2139 i_size = i_size_read(mapping->host);
2140 if (page_start >= i_size ||
2141 (offset == 0 && (pos + len) >= i_size)) {
2142 zero_user_segments(page, 0, offset,
2146 * PageChecked means that the parts of the page
2147 * to which we're not writing are considered up
2148 * to date. Once the data is copied to the
2149 * page, it can be set uptodate.
2151 SetPageChecked(page);
2156 if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
2158 * might as well read a page, it is fast enough. If we get
2159 * an error, we don't need to return it. cifs_write_end will
2160 * do a sync write instead since PG_uptodate isn't set.
2162 cifs_readpage_worker(file, page, &page_start);
2164 /* we could try using another file handle if there is one -
2165 but how would we lock it to prevent close of that handle
2166 racing with this read? In any case
2167 this will be written out by write_end so is fine */
2174 static int cifs_release_page(struct page *page, gfp_t gfp)
2176 if (PagePrivate(page))
2179 return cifs_fscache_release_page(page, gfp);
2182 static void cifs_invalidate_page(struct page *page, unsigned long offset)
2184 struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
2187 cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
2190 void cifs_oplock_break(struct work_struct *work)
2192 struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
2194 struct inode *inode = cfile->dentry->d_inode;
2195 struct cifsInodeInfo *cinode = CIFS_I(inode);
2198 if (inode && S_ISREG(inode->i_mode)) {
2199 if (cinode->clientCanCacheRead)
2200 break_lease(inode, O_RDONLY);
2202 break_lease(inode, O_WRONLY);
2203 rc = filemap_fdatawrite(inode->i_mapping);
2204 if (cinode->clientCanCacheRead == 0) {
2205 rc = filemap_fdatawait(inode->i_mapping);
2206 mapping_set_error(inode->i_mapping, rc);
2207 invalidate_remote_inode(inode);
2209 cFYI(1, "Oplock flush inode %p rc %d", inode, rc);
2213 * releasing stale oplock after recent reconnect of smb session using
2214 * a now incorrect file handle is not a data integrity issue but do
2215 * not bother sending an oplock release if session to server still is
2216 * disconnected since oplock already released by the server
2218 if (!cfile->oplock_break_cancelled) {
2219 rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0,
2220 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false,
2221 cinode->clientCanCacheRead ? 1 : 0);
2222 cFYI(1, "Oplock release rc = %d", rc);
2226 * We might have kicked in before is_valid_oplock_break()
2227 * finished grabbing reference for us. Make sure it's done by
2228 * waiting for cifs_file_list_lock.
2230 spin_lock(&cifs_file_list_lock);
2231 spin_unlock(&cifs_file_list_lock);
2233 cifs_oplock_break_put(cfile);
2236 /* must be called while holding cifs_file_list_lock */
2237 void cifs_oplock_break_get(struct cifsFileInfo *cfile)
2239 cifs_sb_active(cfile->dentry->d_sb);
2240 cifsFileInfo_get(cfile);
2243 void cifs_oplock_break_put(struct cifsFileInfo *cfile)
2245 struct super_block *sb = cfile->dentry->d_sb;
2247 cifsFileInfo_put(cfile);
2248 cifs_sb_deactive(sb);
2251 const struct address_space_operations cifs_addr_ops = {
2252 .readpage = cifs_readpage,
2253 .readpages = cifs_readpages,
2254 .writepage = cifs_writepage,
2255 .writepages = cifs_writepages,
2256 .write_begin = cifs_write_begin,
2257 .write_end = cifs_write_end,
2258 .set_page_dirty = __set_page_dirty_nobuffers,
2259 .releasepage = cifs_release_page,
2260 .invalidatepage = cifs_invalidate_page,
2261 /* .sync_page = cifs_sync_page, */
2266 * cifs_readpages requires the server to support a buffer large enough to
2267 * contain the header plus one complete page of data. Otherwise, we need
2268 * to leave cifs_readpages out of the address space operations.
2270 const struct address_space_operations cifs_addr_ops_smallbuf = {
2271 .readpage = cifs_readpage,
2272 .writepage = cifs_writepage,
2273 .writepages = cifs_writepages,
2274 .write_begin = cifs_write_begin,
2275 .write_end = cifs_write_end,
2276 .set_page_dirty = __set_page_dirty_nobuffers,
2277 .releasepage = cifs_release_page,
2278 .invalidatepage = cifs_invalidate_page,
2279 /* .sync_page = cifs_sync_page, */