2005-04-16 15:20:36 -07:00
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/*
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* fs/cifs/file.c
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*
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* vfs operations that deal with files
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2007-07-09 18:16:18 -07:00
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*
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2010-04-20 21:12:10 -07:00
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* Copyright (C) International Business Machines Corp., 2002,2010
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2005-04-16 15:20:36 -07:00
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* Author(s): Steve French (sfrench@us.ibm.com)
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2006-08-02 14:56:33 -07:00
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* Jeremy Allison (jra@samba.org)
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2005-04-16 15:20:36 -07:00
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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2005-10-05 14:50:29 -07:00
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#include <linux/backing-dev.h>
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2005-04-16 15:20:36 -07:00
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#include <linux/pagemap.h>
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#include <linux/pagevec.h>
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2005-10-05 14:50:29 -07:00
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#include <linux/writeback.h>
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2006-12-10 03:19:44 -07:00
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#include <linux/task_io_accounting_ops.h>
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2005-10-20 13:44:56 -07:00
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#include <linux/delay.h>
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2009-09-21 03:47:50 -07:00
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#include <linux/mount.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 01:04:11 -07:00
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#include <linux/slab.h>
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2005-04-16 15:20:36 -07:00
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#include <asm/div64.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_unicode.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
|
2010-07-05 05:42:45 -07:00
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#include "fscache.h"
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2005-04-16 15:20:36 -07:00
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static inline int cifs_convert_flags(unsigned int flags)
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{
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if ((flags & O_ACCMODE) == O_RDONLY)
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return GENERIC_READ;
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else if ((flags & O_ACCMODE) == O_WRONLY)
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return GENERIC_WRITE;
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else if ((flags & O_ACCMODE) == O_RDWR) {
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/* GENERIC_ALL is too much permission to request
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can cause unnecessary access denied on create */
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/* return GENERIC_ALL; */
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return (GENERIC_READ | GENERIC_WRITE);
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}
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2008-05-14 10:21:33 -07:00
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return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
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FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
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FILE_READ_DATA);
|
2009-02-23 13:43:11 -07:00
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}
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2008-05-14 10:21:33 -07:00
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|
2010-10-15 12:33:56 -07:00
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static u32 cifs_posix_convert_flags(unsigned int flags)
|
2009-02-23 13:43:11 -07:00
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{
|
2010-10-15 12:33:56 -07:00
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u32 posix_flags = 0;
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2008-05-14 10:21:33 -07:00
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2009-02-23 13:43:11 -07:00
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if ((flags & O_ACCMODE) == O_RDONLY)
|
2010-10-15 12:33:56 -07:00
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posix_flags = SMB_O_RDONLY;
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2009-02-23 13:43:11 -07:00
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else if ((flags & O_ACCMODE) == O_WRONLY)
|
2010-10-15 12:33:56 -07:00
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posix_flags = SMB_O_WRONLY;
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else if ((flags & O_ACCMODE) == O_RDWR)
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posix_flags = SMB_O_RDWR;
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if (flags & O_CREAT)
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posix_flags |= SMB_O_CREAT;
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if (flags & O_EXCL)
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posix_flags |= SMB_O_EXCL;
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if (flags & O_TRUNC)
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posix_flags |= SMB_O_TRUNC;
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/* be safe and imply O_SYNC for O_DSYNC */
|
2009-10-27 03:05:28 -07:00
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if (flags & O_DSYNC)
|
2010-10-15 12:33:56 -07:00
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posix_flags |= SMB_O_SYNC;
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2009-02-23 13:43:11 -07:00
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if (flags & O_DIRECTORY)
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2010-10-15 12:33:56 -07:00
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posix_flags |= SMB_O_DIRECTORY;
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2009-02-23 13:43:11 -07:00
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if (flags & O_NOFOLLOW)
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2010-10-15 12:33:56 -07:00
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posix_flags |= SMB_O_NOFOLLOW;
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2009-02-23 13:43:11 -07:00
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if (flags & O_DIRECT)
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2010-10-15 12:33:56 -07:00
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posix_flags |= SMB_O_DIRECT;
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2009-02-23 13:43:11 -07:00
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return posix_flags;
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2005-04-16 15:20:36 -07:00
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}
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static inline int cifs_get_disposition(unsigned int flags)
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{
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if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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return FILE_CREATE;
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else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
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return FILE_OVERWRITE_IF;
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else if ((flags & O_CREAT) == O_CREAT)
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return FILE_OPEN_IF;
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2006-05-30 11:09:31 -07:00
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else if ((flags & O_TRUNC) == O_TRUNC)
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return FILE_OVERWRITE;
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2005-04-16 15:20:36 -07:00
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else
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return FILE_OPEN;
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}
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|
2010-06-16 10:40:17 -07:00
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static inline int cifs_open_inode_helper(struct inode *inode,
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2010-09-17 07:13:10 -07:00
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struct cifsTconInfo *pTcon, __u32 oplock, FILE_ALL_INFO *buf,
|
2005-04-16 15:20:36 -07:00
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char *full_path, int xid)
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{
|
2010-06-16 10:40:17 -07:00
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struct cifsInodeInfo *pCifsInode = CIFS_I(inode);
|
2005-04-16 15:20:36 -07:00
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struct timespec temp;
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int rc;
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|
|
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if (pCifsInode->clientCanCacheRead) {
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/* we have the inode open somewhere else
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no need to discard cache data */
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goto client_can_cache;
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}
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/* BB need same check in cifs_create too? */
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/* if not oplocked, invalidate inode pages if mtime or file
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size changed */
|
2009-05-27 06:37:33 -07:00
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temp = cifs_NTtimeToUnix(buf->LastWriteTime);
|
2010-06-16 10:40:17 -07:00
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if (timespec_equal(&inode->i_mtime, &temp) &&
|
|
|
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(inode->i_size ==
|
2005-04-16 15:20:36 -07:00
|
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(loff_t)le64_to_cpu(buf->EndOfFile))) {
|
2010-04-20 20:50:45 -07:00
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cFYI(1, "inode unchanged on server");
|
2005-04-16 15:20:36 -07:00
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} else {
|
2010-06-16 10:40:17 -07:00
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if (inode->i_mapping) {
|
2010-03-09 13:30:42 -07:00
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|
|
/* BB no need to lock inode until after invalidate
|
|
|
|
since namei code should already have it locked? */
|
2010-06-16 10:40:17 -07:00
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|
rc = filemap_write_and_wait(inode->i_mapping);
|
2010-10-22 11:52:29 -07:00
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|
|
mapping_set_error(inode->i_mapping, rc);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "invalidating remote inode since open detected it "
|
|
|
|
"changed");
|
2010-06-16 10:40:17 -07:00
|
|
|
invalidate_remote_inode(inode);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
client_can_cache:
|
2007-07-18 16:21:09 -07:00
|
|
|
if (pTcon->unix_ext)
|
2010-06-16 10:40:17 -07:00
|
|
|
rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
|
|
|
|
xid);
|
2005-04-16 15:20:36 -07:00
|
|
|
else
|
2010-06-16 10:40:17 -07:00
|
|
|
rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
|
|
|
|
xid, NULL);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-09-17 07:13:10 -07:00
|
|
|
if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
|
2008-04-28 17:06:05 -07:00
|
|
|
pCifsInode->clientCanCacheAll = true;
|
|
|
|
pCifsInode->clientCanCacheRead = true;
|
2010-06-16 10:40:17 -07:00
|
|
|
cFYI(1, "Exclusive Oplock granted on inode %p", inode);
|
2010-09-17 07:13:10 -07:00
|
|
|
} else if ((oplock & 0xF) == OPLOCK_READ)
|
2008-04-28 17:06:05 -07:00
|
|
|
pCifsInode->clientCanCacheRead = true;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2010-10-15 12:33:56 -07:00
|
|
|
int cifs_posix_open(char *full_path, struct inode **pinode,
|
|
|
|
struct super_block *sb, int mode, unsigned int f_flags,
|
|
|
|
__u32 *poplock, __u16 *pnetfid, int xid)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
FILE_UNIX_BASIC_INFO *presp_data;
|
|
|
|
__u32 posix_flags = 0;
|
|
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
|
|
|
|
struct cifs_fattr fattr;
|
|
|
|
struct tcon_link *tlink;
|
|
|
|
struct cifsTconInfo *tcon;
|
|
|
|
|
|
|
|
cFYI(1, "posix open %s", full_path);
|
|
|
|
|
|
|
|
presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
|
|
|
|
if (presp_data == NULL)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
|
|
if (IS_ERR(tlink)) {
|
|
|
|
rc = PTR_ERR(tlink);
|
|
|
|
goto posix_open_ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
tcon = tlink_tcon(tlink);
|
|
|
|
mode &= ~current_umask();
|
|
|
|
|
|
|
|
posix_flags = cifs_posix_convert_flags(f_flags);
|
|
|
|
rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
|
|
|
|
poplock, full_path, cifs_sb->local_nls,
|
|
|
|
cifs_sb->mnt_cifs_flags &
|
|
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
|
|
cifs_put_tlink(tlink);
|
|
|
|
|
|
|
|
if (rc)
|
|
|
|
goto posix_open_ret;
|
|
|
|
|
|
|
|
if (presp_data->Type == cpu_to_le32(-1))
|
|
|
|
goto posix_open_ret; /* open ok, caller does qpathinfo */
|
|
|
|
|
|
|
|
if (!pinode)
|
|
|
|
goto posix_open_ret; /* caller does not need info */
|
|
|
|
|
|
|
|
cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
|
|
|
|
|
|
|
|
/* get new inode and set it up */
|
|
|
|
if (*pinode == NULL) {
|
|
|
|
cifs_fill_uniqueid(sb, &fattr);
|
|
|
|
*pinode = cifs_iget(sb, &fattr);
|
|
|
|
if (!*pinode) {
|
|
|
|
rc = -ENOMEM;
|
|
|
|
goto posix_open_ret;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
cifs_fattr_to_inode(*pinode, &fattr);
|
|
|
|
}
|
|
|
|
|
|
|
|
posix_open_ret:
|
|
|
|
kfree(presp_data);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2010-10-15 12:34:02 -07:00
|
|
|
struct cifsFileInfo *
|
|
|
|
cifs_new_fileinfo(__u16 fileHandle, struct file *file,
|
|
|
|
struct tcon_link *tlink, __u32 oplock)
|
|
|
|
{
|
|
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
|
|
struct inode *inode = dentry->d_inode;
|
|
|
|
struct cifsInodeInfo *pCifsInode = CIFS_I(inode);
|
|
|
|
struct cifsFileInfo *pCifsFile;
|
|
|
|
|
|
|
|
pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
|
|
|
|
if (pCifsFile == NULL)
|
|
|
|
return pCifsFile;
|
|
|
|
|
2010-10-15 12:34:06 -07:00
|
|
|
pCifsFile->count = 1;
|
2010-10-15 12:34:02 -07:00
|
|
|
pCifsFile->netfid = fileHandle;
|
|
|
|
pCifsFile->pid = current->tgid;
|
|
|
|
pCifsFile->uid = current_fsuid();
|
|
|
|
pCifsFile->dentry = dget(dentry);
|
|
|
|
pCifsFile->f_flags = file->f_flags;
|
|
|
|
pCifsFile->invalidHandle = false;
|
|
|
|
pCifsFile->tlink = cifs_get_tlink(tlink);
|
|
|
|
mutex_init(&pCifsFile->fh_mutex);
|
|
|
|
mutex_init(&pCifsFile->lock_mutex);
|
|
|
|
INIT_LIST_HEAD(&pCifsFile->llist);
|
|
|
|
INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
|
|
|
|
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_lock(&cifs_file_list_lock);
|
2010-10-15 12:34:02 -07:00
|
|
|
list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList));
|
|
|
|
/* if readable file instance put first in list*/
|
|
|
|
if (file->f_mode & FMODE_READ)
|
|
|
|
list_add(&pCifsFile->flist, &pCifsInode->openFileList);
|
|
|
|
else
|
|
|
|
list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList);
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2010-10-15 12:34:02 -07:00
|
|
|
|
|
|
|
if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
|
|
|
|
pCifsInode->clientCanCacheAll = true;
|
|
|
|
pCifsInode->clientCanCacheRead = true;
|
|
|
|
cFYI(1, "Exclusive Oplock inode %p", inode);
|
|
|
|
} else if ((oplock & 0xF) == OPLOCK_READ)
|
|
|
|
pCifsInode->clientCanCacheRead = true;
|
|
|
|
|
|
|
|
file->private_data = pCifsFile;
|
|
|
|
return pCifsFile;
|
|
|
|
}
|
|
|
|
|
2010-10-21 15:46:14 -07:00
|
|
|
/*
|
|
|
|
* Release a reference on the file private data. This may involve closing
|
2010-10-15 12:34:06 -07:00
|
|
|
* the filehandle out on the server. Must be called without holding
|
|
|
|
* cifs_file_list_lock.
|
2010-10-21 15:46:14 -07:00
|
|
|
*/
|
2010-10-15 12:34:04 -07:00
|
|
|
void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
|
|
|
|
{
|
2010-10-21 15:46:14 -07:00
|
|
|
struct cifsTconInfo *tcon = tlink_tcon(cifs_file->tlink);
|
|
|
|
struct cifsInodeInfo *cifsi = CIFS_I(cifs_file->dentry->d_inode);
|
|
|
|
struct cifsLockInfo *li, *tmp;
|
|
|
|
|
|
|
|
spin_lock(&cifs_file_list_lock);
|
2010-10-15 12:34:06 -07:00
|
|
|
if (--cifs_file->count > 0) {
|
2010-10-21 15:46:14 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* remove it from the lists */
|
|
|
|
list_del(&cifs_file->flist);
|
|
|
|
list_del(&cifs_file->tlist);
|
|
|
|
|
|
|
|
if (list_empty(&cifsi->openFileList)) {
|
|
|
|
cFYI(1, "closing last open instance for inode %p",
|
|
|
|
cifs_file->dentry->d_inode);
|
|
|
|
cifsi->clientCanCacheRead = false;
|
|
|
|
cifsi->clientCanCacheAll = false;
|
|
|
|
}
|
|
|
|
spin_unlock(&cifs_file_list_lock);
|
|
|
|
|
|
|
|
if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
|
|
|
|
int xid, rc;
|
|
|
|
|
|
|
|
xid = GetXid();
|
|
|
|
rc = CIFSSMBClose(xid, tcon, cifs_file->netfid);
|
|
|
|
FreeXid(xid);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Delete any outstanding lock records. We'll lose them when the file
|
|
|
|
* is closed anyway.
|
|
|
|
*/
|
|
|
|
mutex_lock(&cifs_file->lock_mutex);
|
|
|
|
list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) {
|
|
|
|
list_del(&li->llist);
|
|
|
|
kfree(li);
|
2010-10-15 12:34:04 -07:00
|
|
|
}
|
2010-10-21 15:46:14 -07:00
|
|
|
mutex_unlock(&cifs_file->lock_mutex);
|
|
|
|
|
|
|
|
cifs_put_tlink(cifs_file->tlink);
|
|
|
|
dput(cifs_file->dentry);
|
|
|
|
kfree(cifs_file);
|
2010-10-15 12:34:04 -07:00
|
|
|
}
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
int cifs_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
int rc = -EACCES;
|
2009-09-12 08:54:28 -07:00
|
|
|
int xid;
|
|
|
|
__u32 oplock;
|
2005-04-16 15:20:36 -07:00
|
|
|
struct cifs_sb_info *cifs_sb;
|
2009-03-03 11:00:34 -07:00
|
|
|
struct cifsTconInfo *tcon;
|
2010-09-29 16:51:11 -07:00
|
|
|
struct tcon_link *tlink;
|
2010-06-16 10:40:16 -07:00
|
|
|
struct cifsFileInfo *pCifsFile = NULL;
|
2005-04-16 15:20:36 -07:00
|
|
|
struct cifsInodeInfo *pCifsInode;
|
|
|
|
char *full_path = NULL;
|
|
|
|
int desiredAccess;
|
|
|
|
int disposition;
|
|
|
|
__u16 netfid;
|
|
|
|
FILE_ALL_INFO *buf = NULL;
|
|
|
|
|
|
|
|
xid = GetXid();
|
|
|
|
|
|
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
2010-09-29 16:51:11 -07:00
|
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
|
|
if (IS_ERR(tlink)) {
|
|
|
|
FreeXid(xid);
|
|
|
|
return PTR_ERR(tlink);
|
|
|
|
}
|
|
|
|
tcon = tlink_tcon(tlink);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2009-04-08 18:14:32 -07:00
|
|
|
pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2006-12-08 03:36:48 -07:00
|
|
|
full_path = build_path_from_dentry(file->f_path.dentry);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (full_path == NULL) {
|
2009-06-25 05:42:34 -07:00
|
|
|
rc = -ENOMEM;
|
2010-08-05 10:58:38 -07:00
|
|
|
goto out;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "inode = 0x%p file flags are 0x%x for %s",
|
|
|
|
inode, file->f_flags, full_path);
|
2009-03-03 11:00:34 -07:00
|
|
|
|
|
|
|
if (oplockEnabled)
|
|
|
|
oplock = REQ_OPLOCK;
|
|
|
|
else
|
|
|
|
oplock = 0;
|
|
|
|
|
2009-03-04 12:54:08 -07:00
|
|
|
if (!tcon->broken_posix_open && tcon->unix_ext &&
|
|
|
|
(tcon->ses->capabilities & CAP_UNIX) &&
|
2009-03-03 11:00:34 -07:00
|
|
|
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
|
|
|
|
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
|
|
|
|
/* can not refresh inode info since size could be stale */
|
2010-06-16 10:40:16 -07:00
|
|
|
rc = cifs_posix_open(full_path, &inode, inode->i_sb,
|
2010-04-22 12:21:55 -07:00
|
|
|
cifs_sb->mnt_file_mode /* ignored */,
|
2010-10-15 12:33:56 -07:00
|
|
|
file->f_flags, &oplock, &netfid, xid);
|
2009-03-03 11:00:34 -07:00
|
|
|
if (rc == 0) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "posix open succeeded");
|
2010-06-16 10:40:17 -07:00
|
|
|
|
2010-10-15 12:33:58 -07:00
|
|
|
pCifsFile = cifs_new_fileinfo(netfid, file, tlink,
|
|
|
|
oplock);
|
2010-06-16 10:40:16 -07:00
|
|
|
if (pCifsFile == NULL) {
|
|
|
|
CIFSSMBClose(xid, tcon, netfid);
|
|
|
|
rc = -ENOMEM;
|
|
|
|
}
|
2010-07-05 05:42:45 -07:00
|
|
|
|
|
|
|
cifs_fscache_set_inode_cookie(inode, file);
|
|
|
|
|
2009-03-03 11:00:34 -07:00
|
|
|
goto out;
|
2009-03-04 12:54:08 -07:00
|
|
|
} else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
|
|
|
|
if (tcon->ses->serverNOS)
|
2010-04-20 20:50:45 -07:00
|
|
|
cERROR(1, "server %s of type %s returned"
|
2009-03-04 12:54:08 -07:00
|
|
|
" unexpected error on SMB posix open"
|
|
|
|
", disabling posix open support."
|
|
|
|
" Check if server update available.",
|
|
|
|
tcon->ses->serverName,
|
2010-04-20 20:50:45 -07:00
|
|
|
tcon->ses->serverNOS);
|
2009-03-04 12:54:08 -07:00
|
|
|
tcon->broken_posix_open = true;
|
2009-03-03 11:00:34 -07:00
|
|
|
} else if ((rc != -EIO) && (rc != -EREMOTE) &&
|
|
|
|
(rc != -EOPNOTSUPP)) /* path not found or net err */
|
|
|
|
goto out;
|
2009-03-04 12:54:08 -07:00
|
|
|
/* else fallthrough to retry open the old way on network i/o
|
|
|
|
or DFS errors */
|
2009-03-03 11:00:34 -07:00
|
|
|
}
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
desiredAccess = cifs_convert_flags(file->f_flags);
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
* open flag mapping table:
|
2007-07-09 18:16:18 -07:00
|
|
|
*
|
2005-04-16 15:20:36 -07:00
|
|
|
* POSIX Flag CIFS Disposition
|
2007-07-09 18:16:18 -07:00
|
|
|
* ---------- ----------------
|
2005-04-16 15:20:36 -07:00
|
|
|
* O_CREAT FILE_OPEN_IF
|
|
|
|
* O_CREAT | O_EXCL FILE_CREATE
|
|
|
|
* O_CREAT | O_TRUNC FILE_OVERWRITE_IF
|
|
|
|
* O_TRUNC FILE_OVERWRITE
|
|
|
|
* none of the above FILE_OPEN
|
|
|
|
*
|
|
|
|
* Note that there is not a direct match between disposition
|
2007-07-09 18:16:18 -07:00
|
|
|
* FILE_SUPERSEDE (ie create whether or not file exists although
|
2005-04-16 15:20:36 -07:00
|
|
|
* O_CREAT | O_TRUNC is similar but truncates the existing
|
|
|
|
* file rather than creating a new file as FILE_SUPERSEDE does
|
|
|
|
* (which uses the attributes / metadata passed in on open call)
|
|
|
|
*?
|
2007-07-09 18:16:18 -07:00
|
|
|
*? O_SYNC is a reasonable match to CIFS writethrough flag
|
2005-04-16 15:20:36 -07:00
|
|
|
*? and the read write flags match reasonably. O_LARGEFILE
|
|
|
|
*? is irrelevant because largefile support is always used
|
|
|
|
*? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
|
|
|
|
* O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
|
|
|
|
*********************************************************************/
|
|
|
|
|
|
|
|
disposition = cifs_get_disposition(file->f_flags);
|
|
|
|
|
|
|
|
/* BB pass O_SYNC flag through on file attributes .. BB */
|
|
|
|
|
|
|
|
/* Also refresh inode by passing in file_info buf returned by SMBOpen
|
|
|
|
and calling get_inode_info with returned buf (at least helps
|
|
|
|
non-Unix server case) */
|
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
/* BB we can not do this if this is the second open of a file
|
|
|
|
and the first handle has writebehind data, we might be
|
2005-04-16 15:20:36 -07:00
|
|
|
able to simply do a filemap_fdatawrite/filemap_fdatawait first */
|
|
|
|
buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
|
|
|
|
if (!buf) {
|
|
|
|
rc = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
2006-06-06 17:18:43 -07:00
|
|
|
|
2010-09-20 16:01:33 -07:00
|
|
|
if (tcon->ses->capabilities & CAP_NT_SMBS)
|
2009-03-03 11:00:34 -07:00
|
|
|
rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
|
2006-06-06 17:18:43 -07:00
|
|
|
desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
|
2005-04-28 22:41:06 -07:00
|
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
|
|
|
|
& CIFS_MOUNT_MAP_SPECIAL_CHR);
|
2006-06-06 17:18:43 -07:00
|
|
|
else
|
|
|
|
rc = -EIO; /* no NT SMB support fall into legacy open below */
|
|
|
|
|
2005-08-24 23:06:05 -07:00
|
|
|
if (rc == -EIO) {
|
|
|
|
/* Old server, try legacy style OpenX */
|
2009-03-03 11:00:34 -07:00
|
|
|
rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
|
2005-08-24 23:06:05 -07:00
|
|
|
desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
|
|
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
|
|
|
|
& CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
|
|
}
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "cifs_open returned 0x%x", rc);
|
2005-04-16 15:20:36 -07:00
|
|
|
goto out;
|
|
|
|
}
|
2009-09-25 06:53:37 -07:00
|
|
|
|
2010-09-17 07:13:10 -07:00
|
|
|
rc = cifs_open_inode_helper(inode, tcon, oplock, buf, full_path, xid);
|
2010-06-16 10:40:17 -07:00
|
|
|
if (rc != 0)
|
|
|
|
goto out;
|
|
|
|
|
2010-10-15 12:33:58 -07:00
|
|
|
pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock);
|
2010-06-16 10:40:16 -07:00
|
|
|
if (pCifsFile == NULL) {
|
2005-04-16 15:20:36 -07:00
|
|
|
rc = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2010-07-05 05:42:45 -07:00
|
|
|
cifs_fscache_set_inode_cookie(inode, file);
|
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
if (oplock & CIFS_CREATE_ACTION) {
|
2005-04-16 15:20:36 -07:00
|
|
|
/* time to set mode which we can not set earlier due to
|
|
|
|
problems creating new read-only files */
|
2009-03-03 11:00:34 -07:00
|
|
|
if (tcon->unix_ext) {
|
2008-08-02 04:26:12 -07:00
|
|
|
struct cifs_unix_set_info_args args = {
|
|
|
|
.mode = inode->i_mode,
|
|
|
|
.uid = NO_CHANGE_64,
|
|
|
|
.gid = NO_CHANGE_64,
|
|
|
|
.ctime = NO_CHANGE_64,
|
|
|
|
.atime = NO_CHANGE_64,
|
|
|
|
.mtime = NO_CHANGE_64,
|
|
|
|
.device = 0,
|
|
|
|
};
|
2009-07-09 17:02:49 -07:00
|
|
|
CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
|
|
|
|
cifs_sb->local_nls,
|
|
|
|
cifs_sb->mnt_cifs_flags &
|
2005-04-28 22:41:06 -07:00
|
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
kfree(buf);
|
|
|
|
kfree(full_path);
|
|
|
|
FreeXid(xid);
|
2010-09-29 16:51:11 -07:00
|
|
|
cifs_put_tlink(tlink);
|
2005-04-16 15:20:36 -07:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2006-06-30 09:23:04 -07:00
|
|
|
/* Try to reacquire byte range locks that were released when session */
|
2005-04-16 15:20:36 -07:00
|
|
|
/* to server was lost */
|
|
|
|
static int cifs_relock_file(struct cifsFileInfo *cifsFile)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
/* BB list all locks open on this file and relock */
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2010-10-15 12:33:59 -07:00
|
|
|
static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
|
|
|
int rc = -EACCES;
|
2009-09-12 08:54:28 -07:00
|
|
|
int xid;
|
|
|
|
__u32 oplock;
|
2005-04-16 15:20:36 -07:00
|
|
|
struct cifs_sb_info *cifs_sb;
|
2009-02-23 13:43:11 -07:00
|
|
|
struct cifsTconInfo *tcon;
|
2005-04-16 15:20:36 -07:00
|
|
|
struct cifsInodeInfo *pCifsInode;
|
2007-07-09 18:16:18 -07:00
|
|
|
struct inode *inode;
|
2005-04-16 15:20:36 -07:00
|
|
|
char *full_path = NULL;
|
|
|
|
int desiredAccess;
|
|
|
|
int disposition = FILE_OPEN;
|
|
|
|
__u16 netfid;
|
|
|
|
|
|
|
|
xid = GetXid();
|
2009-06-27 04:04:55 -07:00
|
|
|
mutex_lock(&pCifsFile->fh_mutex);
|
2008-04-28 17:06:05 -07:00
|
|
|
if (!pCifsFile->invalidHandle) {
|
2009-06-27 04:04:55 -07:00
|
|
|
mutex_unlock(&pCifsFile->fh_mutex);
|
2009-06-25 05:42:34 -07:00
|
|
|
rc = 0;
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
2009-06-25 05:42:34 -07:00
|
|
|
return rc;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
2010-10-15 12:33:59 -07:00
|
|
|
inode = pCifsFile->dentry->d_inode;
|
2005-04-16 15:20:36 -07:00
|
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
2010-09-29 16:51:11 -07:00
|
|
|
tcon = tlink_tcon(pCifsFile->tlink);
|
2007-04-04 10:10:24 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
/* can not grab rename sem here because various ops, including
|
|
|
|
those that already have the rename sem can end up causing writepage
|
|
|
|
to get called and if the server was down that means we end up here,
|
|
|
|
and we can never tell if the caller already has the rename_sem */
|
2010-10-15 12:33:59 -07:00
|
|
|
full_path = build_path_from_dentry(pCifsFile->dentry);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (full_path == NULL) {
|
2007-04-04 10:10:24 -07:00
|
|
|
rc = -ENOMEM;
|
2009-06-27 04:04:55 -07:00
|
|
|
mutex_unlock(&pCifsFile->fh_mutex);
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
2007-04-04 10:10:24 -07:00
|
|
|
return rc;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "inode = 0x%p file flags 0x%x for %s",
|
2010-10-15 12:33:59 -07:00
|
|
|
inode, pCifsFile->f_flags, full_path);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if (oplockEnabled)
|
|
|
|
oplock = REQ_OPLOCK;
|
|
|
|
else
|
2008-04-28 17:06:05 -07:00
|
|
|
oplock = 0;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2009-02-23 13:43:11 -07:00
|
|
|
if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
|
|
|
|
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
|
|
|
|
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
|
2010-10-15 12:33:56 -07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* O_CREAT, O_EXCL and O_TRUNC already had their effect on the
|
|
|
|
* original open. Must mask them off for a reopen.
|
|
|
|
*/
|
2010-10-15 12:33:59 -07:00
|
|
|
unsigned int oflags = pCifsFile->f_flags &
|
|
|
|
~(O_CREAT | O_EXCL | O_TRUNC);
|
2010-10-15 12:33:56 -07:00
|
|
|
|
2010-06-16 10:40:16 -07:00
|
|
|
rc = cifs_posix_open(full_path, NULL, inode->i_sb,
|
2010-04-22 12:21:55 -07:00
|
|
|
cifs_sb->mnt_file_mode /* ignored */,
|
|
|
|
oflags, &oplock, &netfid, xid);
|
2009-02-23 13:43:11 -07:00
|
|
|
if (rc == 0) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "posix reopen succeeded");
|
2009-02-23 13:43:11 -07:00
|
|
|
goto reopen_success;
|
|
|
|
}
|
|
|
|
/* fallthrough to retry open the old way on errors, especially
|
|
|
|
in the reconnect path it is important to retry hard */
|
|
|
|
}
|
|
|
|
|
2010-10-15 12:33:59 -07:00
|
|
|
desiredAccess = cifs_convert_flags(pCifsFile->f_flags);
|
2009-02-23 13:43:11 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
/* Can not refresh inode by passing in file_info buf to be returned
|
2007-07-09 18:16:18 -07:00
|
|
|
by SMBOpen and then calling get_inode_info with returned buf
|
|
|
|
since file might have write behind data that needs to be flushed
|
2005-04-16 15:20:36 -07:00
|
|
|
and server version of file size can be stale. If we knew for sure
|
|
|
|
that inode was not dirty locally we could do this */
|
|
|
|
|
2009-02-23 13:43:11 -07:00
|
|
|
rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess,
|
2005-04-16 15:20:36 -07:00
|
|
|
CREATE_NOT_DIR, &netfid, &oplock, NULL,
|
2007-07-09 18:16:18 -07:00
|
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
|
2005-04-28 22:41:06 -07:00
|
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc) {
|
2009-06-27 04:04:55 -07:00
|
|
|
mutex_unlock(&pCifsFile->fh_mutex);
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "cifs_open returned 0x%x", rc);
|
|
|
|
cFYI(1, "oplock: %d", oplock);
|
2010-10-15 12:33:59 -07:00
|
|
|
goto reopen_error_exit;
|
|
|
|
}
|
|
|
|
|
2009-02-23 13:43:11 -07:00
|
|
|
reopen_success:
|
2010-10-15 12:33:59 -07:00
|
|
|
pCifsFile->netfid = netfid;
|
|
|
|
pCifsFile->invalidHandle = false;
|
|
|
|
mutex_unlock(&pCifsFile->fh_mutex);
|
|
|
|
pCifsInode = CIFS_I(inode);
|
|
|
|
|
|
|
|
if (can_flush) {
|
|
|
|
rc = filemap_write_and_wait(inode->i_mapping);
|
2010-10-22 11:52:29 -07:00
|
|
|
mapping_set_error(inode->i_mapping, rc);
|
2010-10-15 12:33:59 -07:00
|
|
|
|
|
|
|
pCifsInode->clientCanCacheAll = false;
|
|
|
|
pCifsInode->clientCanCacheRead = false;
|
|
|
|
if (tcon->unix_ext)
|
|
|
|
rc = cifs_get_inode_info_unix(&inode,
|
|
|
|
full_path, inode->i_sb, xid);
|
|
|
|
else
|
|
|
|
rc = cifs_get_inode_info(&inode,
|
|
|
|
full_path, NULL, inode->i_sb,
|
|
|
|
xid, NULL);
|
|
|
|
} /* else we are writing out data to server already
|
|
|
|
and could deadlock if we tried to flush data, and
|
|
|
|
since we do not know if we have data that would
|
|
|
|
invalidate the current end of file on the server
|
|
|
|
we can not go to the server to get the new inod
|
|
|
|
info */
|
|
|
|
if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
|
|
|
|
pCifsInode->clientCanCacheAll = true;
|
|
|
|
pCifsInode->clientCanCacheRead = true;
|
|
|
|
cFYI(1, "Exclusive Oplock granted on inode %p",
|
|
|
|
pCifsFile->dentry->d_inode);
|
|
|
|
} else if ((oplock & 0xF) == OPLOCK_READ) {
|
|
|
|
pCifsInode->clientCanCacheRead = true;
|
|
|
|
pCifsInode->clientCanCacheAll = false;
|
|
|
|
} else {
|
|
|
|
pCifsInode->clientCanCacheRead = false;
|
|
|
|
pCifsInode->clientCanCacheAll = false;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2010-10-15 12:33:59 -07:00
|
|
|
cifs_relock_file(pCifsFile);
|
|
|
|
|
|
|
|
reopen_error_exit:
|
2005-04-16 15:20:36 -07:00
|
|
|
kfree(full_path);
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
int cifs_close(struct inode *inode, struct file *file)
|
|
|
|
{
|
2010-10-21 15:46:14 -07:00
|
|
|
cifsFileInfo_put(file->private_data);
|
|
|
|
file->private_data = NULL;
|
2006-08-02 14:56:33 -07:00
|
|
|
|
2010-10-21 15:46:14 -07:00
|
|
|
/* return code from the ->release op is always ignored */
|
|
|
|
return 0;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
int cifs_closedir(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
int xid;
|
2010-07-12 13:50:14 -07:00
|
|
|
struct cifsFileInfo *pCFileStruct = file->private_data;
|
2005-04-16 15:20:36 -07:00
|
|
|
char *ptmp;
|
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Closedir inode = 0x%p", inode);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
xid = GetXid();
|
|
|
|
|
|
|
|
if (pCFileStruct) {
|
2010-09-29 16:51:11 -07:00
|
|
|
struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Freeing private data in close dir");
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_lock(&cifs_file_list_lock);
|
2008-04-28 17:06:05 -07:00
|
|
|
if (!pCFileStruct->srch_inf.endOfSearch &&
|
|
|
|
!pCFileStruct->invalidHandle) {
|
|
|
|
pCFileStruct->invalidHandle = true;
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2005-04-16 15:20:36 -07:00
|
|
|
rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Closing uncompleted readdir with rc %d",
|
|
|
|
rc);
|
2005-04-16 15:20:36 -07:00
|
|
|
/* not much we can do if it fails anyway, ignore rc */
|
|
|
|
rc = 0;
|
2008-11-20 13:00:44 -07:00
|
|
|
} else
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2005-04-16 15:20:36 -07:00
|
|
|
ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
|
|
|
|
if (ptmp) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "closedir free smb buf in srch struct");
|
2005-04-16 15:20:36 -07:00
|
|
|
pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
|
2007-07-09 18:16:18 -07:00
|
|
|
if (pCFileStruct->srch_inf.smallBuf)
|
2006-02-27 20:45:48 -07:00
|
|
|
cifs_small_buf_release(ptmp);
|
|
|
|
else
|
|
|
|
cifs_buf_release(ptmp);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2010-09-29 16:51:11 -07:00
|
|
|
cifs_put_tlink(pCFileStruct->tlink);
|
2005-04-16 15:20:36 -07:00
|
|
|
kfree(file->private_data);
|
|
|
|
file->private_data = NULL;
|
|
|
|
}
|
|
|
|
/* BB can we lock the filestruct while this is going on? */
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2006-08-02 14:56:33 -07:00
|
|
|
static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
|
|
|
|
__u64 offset, __u8 lockType)
|
|
|
|
{
|
2007-07-09 18:16:18 -07:00
|
|
|
struct cifsLockInfo *li =
|
|
|
|
kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
|
2006-08-02 14:56:33 -07:00
|
|
|
if (li == NULL)
|
|
|
|
return -ENOMEM;
|
|
|
|
li->offset = offset;
|
|
|
|
li->length = len;
|
|
|
|
li->type = lockType;
|
2007-05-02 21:33:45 -07:00
|
|
|
mutex_lock(&fid->lock_mutex);
|
2006-08-02 14:56:33 -07:00
|
|
|
list_add(&li->llist, &fid->llist);
|
2007-05-02 21:33:45 -07:00
|
|
|
mutex_unlock(&fid->lock_mutex);
|
2006-08-02 14:56:33 -07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
|
|
|
|
{
|
|
|
|
int rc, xid;
|
|
|
|
__u32 numLock = 0;
|
|
|
|
__u32 numUnlock = 0;
|
|
|
|
__u64 length;
|
2008-04-28 17:06:05 -07:00
|
|
|
bool wait_flag = false;
|
2005-04-16 15:20:36 -07:00
|
|
|
struct cifs_sb_info *cifs_sb;
|
2008-12-02 10:24:33 -07:00
|
|
|
struct cifsTconInfo *tcon;
|
2006-02-28 15:39:25 -07:00
|
|
|
__u16 netfid;
|
|
|
|
__u8 lockType = LOCKING_ANDX_LARGE_FILES;
|
2008-12-02 10:24:33 -07:00
|
|
|
bool posix_locking = 0;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
length = 1 + pfLock->fl_end - pfLock->fl_start;
|
|
|
|
rc = -EACCES;
|
|
|
|
xid = GetXid();
|
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Lock parm: 0x%x flockflags: "
|
2005-04-16 15:20:36 -07:00
|
|
|
"0x%x flocktype: 0x%x start: %lld end: %lld",
|
2007-07-09 18:16:18 -07:00
|
|
|
cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
|
2010-04-20 20:50:45 -07:00
|
|
|
pfLock->fl_end);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if (pfLock->fl_flags & FL_POSIX)
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Posix");
|
2005-04-16 15:20:36 -07:00
|
|
|
if (pfLock->fl_flags & FL_FLOCK)
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Flock");
|
2005-04-16 15:20:36 -07:00
|
|
|
if (pfLock->fl_flags & FL_SLEEP) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Blocking lock");
|
2008-04-28 17:06:05 -07:00
|
|
|
wait_flag = true;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
if (pfLock->fl_flags & FL_ACCESS)
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Process suspended by mandatory locking - "
|
|
|
|
"not implemented yet");
|
2005-04-16 15:20:36 -07:00
|
|
|
if (pfLock->fl_flags & FL_LEASE)
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Lease on file - not implemented yet");
|
2007-07-09 18:16:18 -07:00
|
|
|
if (pfLock->fl_flags &
|
2005-04-16 15:20:36 -07:00
|
|
|
(~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if (pfLock->fl_type == F_WRLCK) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "F_WRLCK ");
|
2005-04-16 15:20:36 -07:00
|
|
|
numLock = 1;
|
|
|
|
} else if (pfLock->fl_type == F_UNLCK) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "F_UNLCK");
|
2005-04-16 15:20:36 -07:00
|
|
|
numUnlock = 1;
|
2006-02-27 20:45:48 -07:00
|
|
|
/* Check if unlock includes more than
|
|
|
|
one lock range */
|
2005-04-16 15:20:36 -07:00
|
|
|
} else if (pfLock->fl_type == F_RDLCK) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "F_RDLCK");
|
2005-04-16 15:20:36 -07:00
|
|
|
lockType |= LOCKING_ANDX_SHARED_LOCK;
|
|
|
|
numLock = 1;
|
|
|
|
} else if (pfLock->fl_type == F_EXLCK) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "F_EXLCK");
|
2005-04-16 15:20:36 -07:00
|
|
|
numLock = 1;
|
|
|
|
} else if (pfLock->fl_type == F_SHLCK) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "F_SHLCK");
|
2005-04-16 15:20:36 -07:00
|
|
|
lockType |= LOCKING_ANDX_SHARED_LOCK;
|
|
|
|
numLock = 1;
|
|
|
|
} else
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Unknown type of lock");
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2006-12-08 03:36:48 -07:00
|
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
2010-09-29 16:51:11 -07:00
|
|
|
tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if (file->private_data == NULL) {
|
2009-06-25 05:42:34 -07:00
|
|
|
rc = -EBADF;
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
2009-06-25 05:42:34 -07:00
|
|
|
return rc;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2006-02-28 15:39:25 -07:00
|
|
|
netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
|
|
|
|
|
2008-12-02 10:24:33 -07:00
|
|
|
if ((tcon->ses->capabilities & CAP_UNIX) &&
|
|
|
|
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
|
2008-12-02 11:53:55 -07:00
|
|
|
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
|
2008-12-02 10:24:33 -07:00
|
|
|
posix_locking = 1;
|
2006-02-28 15:39:25 -07:00
|
|
|
/* BB add code here to normalize offset and length to
|
|
|
|
account for negative length which we can not accept over the
|
|
|
|
wire */
|
2005-04-16 15:20:36 -07:00
|
|
|
if (IS_GETLK(cmd)) {
|
2007-07-09 18:16:18 -07:00
|
|
|
if (posix_locking) {
|
2006-02-28 15:39:25 -07:00
|
|
|
int posix_lock_type;
|
2007-07-09 18:16:18 -07:00
|
|
|
if (lockType & LOCKING_ANDX_SHARED_LOCK)
|
2006-02-28 15:39:25 -07:00
|
|
|
posix_lock_type = CIFS_RDLCK;
|
|
|
|
else
|
|
|
|
posix_lock_type = CIFS_WRLCK;
|
2008-12-02 10:24:33 -07:00
|
|
|
rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */,
|
2006-05-30 11:03:32 -07:00
|
|
|
length, pfLock,
|
2006-02-28 15:39:25 -07:00
|
|
|
posix_lock_type, wait_flag);
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* BB we could chain these into one lock request BB */
|
2008-12-02 10:24:33 -07:00
|
|
|
rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start,
|
2006-02-28 15:39:25 -07:00
|
|
|
0, 1, lockType, 0 /* wait flag */ );
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc == 0) {
|
2008-12-02 10:24:33 -07:00
|
|
|
rc = CIFSSMBLock(xid, tcon, netfid, length,
|
2005-04-16 15:20:36 -07:00
|
|
|
pfLock->fl_start, 1 /* numUnlock */ ,
|
|
|
|
0 /* numLock */ , lockType,
|
|
|
|
0 /* wait flag */ );
|
|
|
|
pfLock->fl_type = F_UNLCK;
|
|
|
|
if (rc != 0)
|
2010-04-20 20:50:45 -07:00
|
|
|
cERROR(1, "Error unlocking previously locked "
|
|
|
|
"range %d during test of lock", rc);
|
2005-04-16 15:20:36 -07:00
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
} else {
|
|
|
|
/* if rc == ERR_SHARING_VIOLATION ? */
|
2010-04-04 22:59:14 -07:00
|
|
|
rc = 0;
|
|
|
|
|
|
|
|
if (lockType & LOCKING_ANDX_SHARED_LOCK) {
|
|
|
|
pfLock->fl_type = F_WRLCK;
|
|
|
|
} else {
|
|
|
|
rc = CIFSSMBLock(xid, tcon, netfid, length,
|
|
|
|
pfLock->fl_start, 0, 1,
|
|
|
|
lockType | LOCKING_ANDX_SHARED_LOCK,
|
|
|
|
0 /* wait flag */);
|
|
|
|
if (rc == 0) {
|
|
|
|
rc = CIFSSMBLock(xid, tcon, netfid,
|
|
|
|
length, pfLock->fl_start, 1, 0,
|
|
|
|
lockType |
|
|
|
|
LOCKING_ANDX_SHARED_LOCK,
|
|
|
|
0 /* wait flag */);
|
|
|
|
pfLock->fl_type = F_RDLCK;
|
|
|
|
if (rc != 0)
|
2010-04-20 21:12:10 -07:00
|
|
|
cERROR(1, "Error unlocking "
|
2010-04-04 22:59:14 -07:00
|
|
|
"previously locked range %d "
|
2010-04-20 21:12:10 -07:00
|
|
|
"during test of lock", rc);
|
2010-04-04 22:59:14 -07:00
|
|
|
rc = 0;
|
|
|
|
} else {
|
|
|
|
pfLock->fl_type = F_WRLCK;
|
|
|
|
rc = 0;
|
|
|
|
}
|
|
|
|
}
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
2006-08-02 14:56:33 -07:00
|
|
|
|
|
|
|
if (!numLock && !numUnlock) {
|
|
|
|
/* if no lock or unlock then nothing
|
|
|
|
to do since we do not know what it is */
|
|
|
|
FreeXid(xid);
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (posix_locking) {
|
2006-02-28 15:39:25 -07:00
|
|
|
int posix_lock_type;
|
2007-07-09 18:16:18 -07:00
|
|
|
if (lockType & LOCKING_ANDX_SHARED_LOCK)
|
2006-02-28 15:39:25 -07:00
|
|
|
posix_lock_type = CIFS_RDLCK;
|
|
|
|
else
|
|
|
|
posix_lock_type = CIFS_WRLCK;
|
2007-07-12 17:33:32 -07:00
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
if (numUnlock == 1)
|
2006-03-03 16:36:34 -07:00
|
|
|
posix_lock_type = CIFS_UNLCK;
|
2006-08-02 14:56:33 -07:00
|
|
|
|
2008-12-02 10:24:33 -07:00
|
|
|
rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */,
|
2006-05-30 11:03:32 -07:00
|
|
|
length, pfLock,
|
2006-02-28 15:39:25 -07:00
|
|
|
posix_lock_type, wait_flag);
|
2006-08-02 14:56:33 -07:00
|
|
|
} else {
|
2010-07-12 13:50:14 -07:00
|
|
|
struct cifsFileInfo *fid = file->private_data;
|
2006-08-02 14:56:33 -07:00
|
|
|
|
|
|
|
if (numLock) {
|
2008-12-02 10:24:33 -07:00
|
|
|
rc = CIFSSMBLock(xid, tcon, netfid, length,
|
2007-07-09 18:16:18 -07:00
|
|
|
pfLock->fl_start,
|
2006-08-02 14:56:33 -07:00
|
|
|
0, numLock, lockType, wait_flag);
|
|
|
|
|
|
|
|
if (rc == 0) {
|
|
|
|
/* For Windows locks we must store them. */
|
|
|
|
rc = store_file_lock(fid, length,
|
|
|
|
pfLock->fl_start, lockType);
|
|
|
|
}
|
|
|
|
} else if (numUnlock) {
|
|
|
|
/* For each stored lock that this unlock overlaps
|
|
|
|
completely, unlock it. */
|
|
|
|
int stored_rc = 0;
|
|
|
|
struct cifsLockInfo *li, *tmp;
|
|
|
|
|
2006-09-21 00:35:29 -07:00
|
|
|
rc = 0;
|
2007-05-02 21:33:45 -07:00
|
|
|
mutex_lock(&fid->lock_mutex);
|
2006-08-02 14:56:33 -07:00
|
|
|
list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
|
|
|
|
if (pfLock->fl_start <= li->offset &&
|
2007-08-23 20:22:48 -07:00
|
|
|
(pfLock->fl_start + length) >=
|
2007-08-23 20:16:51 -07:00
|
|
|
(li->offset + li->length)) {
|
2008-12-02 10:24:33 -07:00
|
|
|
stored_rc = CIFSSMBLock(xid, tcon,
|
2007-07-09 18:16:18 -07:00
|
|
|
netfid,
|
2006-08-02 14:56:33 -07:00
|
|
|
li->length, li->offset,
|
2008-04-28 17:06:05 -07:00
|
|
|
1, 0, li->type, false);
|
2006-08-02 14:56:33 -07:00
|
|
|
if (stored_rc)
|
|
|
|
rc = stored_rc;
|
2010-04-21 12:44:24 -07:00
|
|
|
else {
|
|
|
|
list_del(&li->llist);
|
|
|
|
kfree(li);
|
|
|
|
}
|
2006-08-02 14:56:33 -07:00
|
|
|
}
|
|
|
|
}
|
2007-05-02 21:33:45 -07:00
|
|
|
mutex_unlock(&fid->lock_mutex);
|
2006-08-02 14:56:33 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2005-08-26 12:42:59 -07:00
|
|
|
if (pfLock->fl_flags & FL_POSIX)
|
2005-04-16 15:20:36 -07:00
|
|
|
posix_lock_file_wait(file, pfLock);
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2009-04-03 10:44:00 -07:00
|
|
|
/*
|
|
|
|
* Set the timeout on write requests past EOF. For some servers (Windows)
|
|
|
|
* these calls can be very long.
|
|
|
|
*
|
|
|
|
* If we're writing >10M past the EOF we give a 180s timeout. Anything less
|
|
|
|
* than that gets a 45s timeout. Writes not past EOF get 15s timeouts.
|
|
|
|
* The 10M cutoff is totally arbitrary. A better scheme for this would be
|
|
|
|
* welcome if someone wants to suggest one.
|
|
|
|
*
|
|
|
|
* We may be able to do a better job with this if there were some way to
|
|
|
|
* declare that a file should be sparse.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset)
|
|
|
|
{
|
|
|
|
if (offset <= cifsi->server_eof)
|
|
|
|
return CIFS_STD_OP;
|
|
|
|
else if (offset > (cifsi->server_eof + (10 * 1024 * 1024)))
|
|
|
|
return CIFS_VLONG_OP;
|
|
|
|
else
|
|
|
|
return CIFS_LONG_OP;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* update the file size (if needed) after a write */
|
|
|
|
static void
|
|
|
|
cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
|
|
|
|
unsigned int bytes_written)
|
|
|
|
{
|
|
|
|
loff_t end_of_write = offset + bytes_written;
|
|
|
|
|
|
|
|
if (end_of_write > cifsi->server_eof)
|
|
|
|
cifsi->server_eof = end_of_write;
|
|
|
|
}
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
ssize_t cifs_user_write(struct file *file, const char __user *write_data,
|
|
|
|
size_t write_size, loff_t *poffset)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
unsigned int bytes_written = 0;
|
|
|
|
unsigned int total_written;
|
|
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
struct cifsTconInfo *pTcon;
|
|
|
|
int xid, long_op;
|
|
|
|
struct cifsFileInfo *open_file;
|
2009-04-03 10:44:00 -07:00
|
|
|
struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2006-12-08 03:36:48 -07:00
|
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
/* cFYI(1, " write %d bytes to offset %lld of %s", write_size,
|
|
|
|
*poffset, file->f_path.dentry->d_name.name); */
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if (file->private_data == NULL)
|
|
|
|
return -EBADF;
|
2010-09-20 16:01:31 -07:00
|
|
|
|
2010-07-12 13:50:14 -07:00
|
|
|
open_file = file->private_data;
|
2010-09-29 16:51:11 -07:00
|
|
|
pTcon = tlink_tcon(open_file->tlink);
|
2007-07-12 17:33:32 -07:00
|
|
|
|
2008-08-28 04:54:59 -07:00
|
|
|
rc = generic_write_checks(file, poffset, &write_size, 0);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
xid = GetXid();
|
|
|
|
|
2009-04-03 10:44:00 -07:00
|
|
|
long_op = cifs_write_timeout(cifsi, *poffset);
|
2005-04-16 15:20:36 -07:00
|
|
|
for (total_written = 0; write_size > total_written;
|
|
|
|
total_written += bytes_written) {
|
|
|
|
rc = -EAGAIN;
|
|
|
|
while (rc == -EAGAIN) {
|
|
|
|
if (file->private_data == NULL) {
|
|
|
|
/* file has been closed on us */
|
|
|
|
FreeXid(xid);
|
|
|
|
/* if we have gotten here we have written some data
|
|
|
|
and blocked, and the file has been freed on us while
|
|
|
|
we blocked so return what we managed to write */
|
|
|
|
return total_written;
|
2007-07-09 18:16:18 -07:00
|
|
|
}
|
2005-04-16 15:20:36 -07:00
|
|
|
if (open_file->invalidHandle) {
|
|
|
|
/* we could deadlock if we called
|
|
|
|
filemap_fdatawait from here so tell
|
|
|
|
reopen_file not to flush data to server
|
|
|
|
now */
|
2010-10-15 12:33:59 -07:00
|
|
|
rc = cifs_reopen_file(open_file, false);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc != 0)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
rc = CIFSSMBWrite(xid, pTcon,
|
|
|
|
open_file->netfid,
|
|
|
|
min_t(const int, cifs_sb->wsize,
|
|
|
|
write_size - total_written),
|
|
|
|
*poffset, &bytes_written,
|
|
|
|
NULL, write_data + total_written, long_op);
|
|
|
|
}
|
|
|
|
if (rc || (bytes_written == 0)) {
|
|
|
|
if (total_written)
|
|
|
|
break;
|
|
|
|
else {
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
2009-04-03 10:44:00 -07:00
|
|
|
} else {
|
|
|
|
cifs_update_eof(cifsi, *poffset, bytes_written);
|
2005-04-16 15:20:36 -07:00
|
|
|
*poffset += bytes_written;
|
2009-04-03 10:44:00 -07:00
|
|
|
}
|
2007-11-13 15:41:37 -07:00
|
|
|
long_op = CIFS_STD_OP; /* subsequent writes fast -
|
2005-04-16 15:20:36 -07:00
|
|
|
15 seconds is plenty */
|
|
|
|
}
|
|
|
|
|
2005-08-24 13:59:35 -07:00
|
|
|
cifs_stats_bytes_written(pTcon, total_written);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
/* since the write may have blocked check these pointers again */
|
2007-02-26 09:46:11 -07:00
|
|
|
if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) {
|
|
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
2007-07-09 18:16:18 -07:00
|
|
|
/* Do not update local mtime - server will set its actual value on write
|
|
|
|
* inode->i_ctime = inode->i_mtime =
|
2007-02-26 09:46:11 -07:00
|
|
|
* current_fs_time(inode->i_sb);*/
|
|
|
|
if (total_written > 0) {
|
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
if (*poffset > file->f_path.dentry->d_inode->i_size)
|
|
|
|
i_size_write(file->f_path.dentry->d_inode,
|
2005-04-16 15:20:36 -07:00
|
|
|
*poffset);
|
2007-02-26 09:46:11 -07:00
|
|
|
spin_unlock(&inode->i_lock);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2007-07-09 18:16:18 -07:00
|
|
|
mark_inode_dirty_sync(file->f_path.dentry->d_inode);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
FreeXid(xid);
|
|
|
|
return total_written;
|
|
|
|
}
|
|
|
|
|
2010-10-15 12:34:00 -07:00
|
|
|
static ssize_t cifs_write(struct cifsFileInfo *open_file,
|
|
|
|
const char *write_data, size_t write_size,
|
|
|
|
loff_t *poffset)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
unsigned int bytes_written = 0;
|
|
|
|
unsigned int total_written;
|
|
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
struct cifsTconInfo *pTcon;
|
|
|
|
int xid, long_op;
|
2010-10-15 12:34:00 -07:00
|
|
|
struct dentry *dentry = open_file->dentry;
|
|
|
|
struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-10-15 12:34:00 -07:00
|
|
|
cifs_sb = CIFS_SB(dentry->d_sb);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "write %zd bytes to offset %lld of %s", write_size,
|
2010-10-15 12:34:00 -07:00
|
|
|
*poffset, dentry->d_name.name);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-09-29 16:51:11 -07:00
|
|
|
pTcon = tlink_tcon(open_file->tlink);
|
2007-07-12 17:33:32 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
xid = GetXid();
|
|
|
|
|
2009-04-03 10:44:00 -07:00
|
|
|
long_op = cifs_write_timeout(cifsi, *poffset);
|
2005-04-16 15:20:36 -07:00
|
|
|
for (total_written = 0; write_size > total_written;
|
|
|
|
total_written += bytes_written) {
|
|
|
|
rc = -EAGAIN;
|
|
|
|
while (rc == -EAGAIN) {
|
|
|
|
if (open_file->invalidHandle) {
|
|
|
|
/* we could deadlock if we called
|
|
|
|
filemap_fdatawait from here so tell
|
2007-07-09 18:16:18 -07:00
|
|
|
reopen_file not to flush data to
|
2005-04-16 15:20:36 -07:00
|
|
|
server now */
|
2010-10-15 12:33:59 -07:00
|
|
|
rc = cifs_reopen_file(open_file, false);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc != 0)
|
|
|
|
break;
|
|
|
|
}
|
2007-07-09 18:16:18 -07:00
|
|
|
if (experimEnabled || (pTcon->ses->server &&
|
|
|
|
((pTcon->ses->server->secMode &
|
2006-05-30 11:08:26 -07:00
|
|
|
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
|
2006-05-30 11:05:10 -07:00
|
|
|
== 0))) {
|
2005-10-03 13:37:24 -07:00
|
|
|
struct kvec iov[2];
|
|
|
|
unsigned int len;
|
|
|
|
|
2005-10-10 10:57:19 -07:00
|
|
|
len = min((size_t)cifs_sb->wsize,
|
2005-10-03 13:37:24 -07:00
|
|
|
write_size - total_written);
|
|
|
|
/* iov[0] is reserved for smb header */
|
|
|
|
iov[1].iov_base = (char *)write_data +
|
|
|
|
total_written;
|
|
|
|
iov[1].iov_len = len;
|
2005-06-13 11:24:43 -07:00
|
|
|
rc = CIFSSMBWrite2(xid, pTcon,
|
2005-10-03 13:37:24 -07:00
|
|
|
open_file->netfid, len,
|
2005-06-13 11:24:43 -07:00
|
|
|
*poffset, &bytes_written,
|
2005-10-03 13:37:24 -07:00
|
|
|
iov, 1, long_op);
|
2005-06-13 11:24:43 -07:00
|
|
|
} else
|
2006-04-22 08:53:05 -07:00
|
|
|
rc = CIFSSMBWrite(xid, pTcon,
|
|
|
|
open_file->netfid,
|
|
|
|
min_t(const int, cifs_sb->wsize,
|
|
|
|
write_size - total_written),
|
|
|
|
*poffset, &bytes_written,
|
|
|
|
write_data + total_written,
|
|
|
|
NULL, long_op);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
if (rc || (bytes_written == 0)) {
|
|
|
|
if (total_written)
|
|
|
|
break;
|
|
|
|
else {
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
2009-04-03 10:44:00 -07:00
|
|
|
} else {
|
|
|
|
cifs_update_eof(cifsi, *poffset, bytes_written);
|
2005-04-16 15:20:36 -07:00
|
|
|
*poffset += bytes_written;
|
2009-04-03 10:44:00 -07:00
|
|
|
}
|
2007-11-13 15:41:37 -07:00
|
|
|
long_op = CIFS_STD_OP; /* subsequent writes fast -
|
2005-04-16 15:20:36 -07:00
|
|
|
15 seconds is plenty */
|
|
|
|
}
|
|
|
|
|
2005-08-24 13:59:35 -07:00
|
|
|
cifs_stats_bytes_written(pTcon, total_written);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-10-15 12:34:00 -07:00
|
|
|
if (total_written > 0) {
|
|
|
|
spin_lock(&dentry->d_inode->i_lock);
|
|
|
|
if (*poffset > dentry->d_inode->i_size)
|
|
|
|
i_size_write(dentry->d_inode, *poffset);
|
|
|
|
spin_unlock(&dentry->d_inode->i_lock);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2010-10-15 12:34:00 -07:00
|
|
|
mark_inode_dirty_sync(dentry->d_inode);
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
|
|
|
return total_written;
|
|
|
|
}
|
|
|
|
|
2007-10-25 14:17:17 -07:00
|
|
|
#ifdef CONFIG_CIFS_EXPERIMENTAL
|
2010-09-29 16:51:11 -07:00
|
|
|
struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
|
|
|
|
bool fsuid_only)
|
2007-10-25 14:17:17 -07:00
|
|
|
{
|
|
|
|
struct cifsFileInfo *open_file = NULL;
|
2010-09-29 16:51:11 -07:00
|
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
|
|
|
|
|
|
|
|
/* only filter by fsuid on multiuser mounts */
|
|
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
|
|
|
|
fsuid_only = false;
|
2007-10-25 14:17:17 -07:00
|
|
|
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_lock(&cifs_file_list_lock);
|
2007-10-25 14:17:17 -07:00
|
|
|
/* we could simply get the first_list_entry since write-only entries
|
|
|
|
are always at the end of the list but since the first entry might
|
|
|
|
have a close pending, we go through the whole list */
|
|
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
2010-09-29 16:51:11 -07:00
|
|
|
if (fsuid_only && open_file->uid != current_fsuid())
|
|
|
|
continue;
|
2010-10-15 12:34:01 -07:00
|
|
|
if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) {
|
2007-10-25 14:17:17 -07:00
|
|
|
if (!open_file->invalidHandle) {
|
|
|
|
/* found a good file */
|
|
|
|
/* lock it so it will not be closed on us */
|
2009-08-31 08:07:12 -07:00
|
|
|
cifsFileInfo_get(open_file);
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2007-10-25 14:17:17 -07:00
|
|
|
return open_file;
|
|
|
|
} /* else might as well continue, and look for
|
|
|
|
another, or simply have the caller reopen it
|
|
|
|
again rather than trying to fix this handle */
|
|
|
|
} else /* write only file */
|
|
|
|
break; /* write only files are last so must be done */
|
|
|
|
}
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2007-10-25 14:17:17 -07:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2010-09-29 16:51:11 -07:00
|
|
|
struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
|
|
|
|
bool fsuid_only)
|
2005-10-05 12:23:19 -07:00
|
|
|
{
|
|
|
|
struct cifsFileInfo *open_file;
|
2010-09-29 16:51:11 -07:00
|
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
|
2008-09-22 18:33:33 -07:00
|
|
|
bool any_available = false;
|
2005-10-05 19:32:49 -07:00
|
|
|
int rc;
|
2005-10-05 12:23:19 -07:00
|
|
|
|
2006-04-22 08:53:05 -07:00
|
|
|
/* Having a null inode here (because mapping->host was set to zero by
|
|
|
|
the VFS or MM) should not happen but we had reports of on oops (due to
|
|
|
|
it being zero) during stress testcases so we need to check for it */
|
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
if (cifs_inode == NULL) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cERROR(1, "Null inode passed to cifs_writeable_file");
|
2006-04-22 08:53:05 -07:00
|
|
|
dump_stack();
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2010-09-29 16:51:11 -07:00
|
|
|
/* only filter by fsuid on multiuser mounts */
|
|
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
|
|
|
|
fsuid_only = false;
|
|
|
|
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_lock(&cifs_file_list_lock);
|
2007-10-01 18:11:08 -07:00
|
|
|
refind_writable:
|
2005-10-05 12:23:19 -07:00
|
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
2010-09-29 16:51:11 -07:00
|
|
|
if (!any_available && open_file->pid != current->tgid)
|
|
|
|
continue;
|
|
|
|
if (fsuid_only && open_file->uid != current_fsuid())
|
2005-10-05 12:23:19 -07:00
|
|
|
continue;
|
2010-10-15 12:34:01 -07:00
|
|
|
if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
|
2009-08-31 08:07:12 -07:00
|
|
|
cifsFileInfo_get(open_file);
|
2007-10-01 18:11:08 -07:00
|
|
|
|
|
|
|
if (!open_file->invalidHandle) {
|
|
|
|
/* found a good writable file */
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2007-10-01 18:11:08 -07:00
|
|
|
return open_file;
|
|
|
|
}
|
2007-11-16 16:05:52 -07:00
|
|
|
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2010-10-21 15:46:14 -07:00
|
|
|
|
2007-10-01 18:11:08 -07:00
|
|
|
/* Had to unlock since following call can block */
|
2010-10-15 12:33:59 -07:00
|
|
|
rc = cifs_reopen_file(open_file, false);
|
2010-10-21 15:46:14 -07:00
|
|
|
if (!rc)
|
|
|
|
return open_file;
|
2007-10-01 18:11:08 -07:00
|
|
|
|
2010-10-21 15:46:14 -07:00
|
|
|
/* if it fails, try another handle if possible */
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "wp failed on reopen file");
|
2009-08-31 08:07:12 -07:00
|
|
|
cifsFileInfo_put(open_file);
|
2007-11-16 16:05:52 -07:00
|
|
|
|
2010-10-21 15:46:14 -07:00
|
|
|
spin_lock(&cifs_file_list_lock);
|
|
|
|
|
2007-10-01 18:11:08 -07:00
|
|
|
/* else we simply continue to the next entry. Thus
|
|
|
|
we do not loop on reopen errors. If we
|
|
|
|
can not reopen the file, for example if we
|
|
|
|
reconnected to a server with another client
|
|
|
|
racing to delete or lock the file we would not
|
|
|
|
make progress if we restarted before the beginning
|
|
|
|
of the loop here. */
|
2005-10-05 12:23:19 -07:00
|
|
|
}
|
|
|
|
}
|
2008-09-22 18:33:33 -07:00
|
|
|
/* couldn't find useable FH with same pid, try any available */
|
|
|
|
if (!any_available) {
|
|
|
|
any_available = true;
|
|
|
|
goto refind_writable;
|
|
|
|
}
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2005-10-05 12:23:19 -07:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
|
|
|
|
{
|
|
|
|
struct address_space *mapping = page->mapping;
|
|
|
|
loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
|
|
|
char *write_data;
|
|
|
|
int rc = -EFAULT;
|
|
|
|
int bytes_written = 0;
|
|
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
struct inode *inode;
|
2005-10-05 12:23:19 -07:00
|
|
|
struct cifsFileInfo *open_file;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if (!mapping || !mapping->host)
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
inode = page->mapping->host;
|
|
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
|
|
|
|
|
|
offset += (loff_t)from;
|
|
|
|
write_data = kmap(page);
|
|
|
|
write_data += from;
|
|
|
|
|
|
|
|
if ((to > PAGE_CACHE_SIZE) || (from > to)) {
|
|
|
|
kunmap(page);
|
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* racing with truncate? */
|
|
|
|
if (offset > mapping->host->i_size) {
|
|
|
|
kunmap(page);
|
|
|
|
return 0; /* don't care */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* check to make sure that we are not extending the file */
|
|
|
|
if (mapping->host->i_size - offset < (loff_t)to)
|
2007-07-09 18:16:18 -07:00
|
|
|
to = (unsigned)(mapping->host->i_size - offset);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-09-29 16:51:11 -07:00
|
|
|
open_file = find_writable_file(CIFS_I(mapping->host), false);
|
2005-10-05 12:23:19 -07:00
|
|
|
if (open_file) {
|
2010-10-15 12:34:00 -07:00
|
|
|
bytes_written = cifs_write(open_file, write_data,
|
|
|
|
to - from, &offset);
|
2009-08-31 08:07:12 -07:00
|
|
|
cifsFileInfo_put(open_file);
|
2005-04-16 15:20:36 -07:00
|
|
|
/* Does mm or vfs already set times? */
|
2005-10-05 12:23:19 -07:00
|
|
|
inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
|
2007-12-30 21:21:29 -07:00
|
|
|
if ((bytes_written > 0) && (offset))
|
2005-10-05 12:23:19 -07:00
|
|
|
rc = 0;
|
2007-12-30 21:21:29 -07:00
|
|
|
else if (bytes_written < 0)
|
|
|
|
rc = bytes_written;
|
2005-10-05 12:23:19 -07:00
|
|
|
} else {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "No writeable filehandles for inode");
|
2005-04-16 15:20:36 -07:00
|
|
|
rc = -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
kunmap(page);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cifs_writepages(struct address_space *mapping,
|
2005-10-05 14:50:29 -07:00
|
|
|
struct writeback_control *wbc)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
2005-10-05 14:50:29 -07:00
|
|
|
struct backing_dev_info *bdi = mapping->backing_dev_info;
|
|
|
|
unsigned int bytes_to_write;
|
|
|
|
unsigned int bytes_written;
|
|
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
int done = 0;
|
[PATCH] writeback: fix range handling
When a writeback_control's `start' and `end' fields are used to
indicate a one-byte-range starting at file offset zero, the required
values of .start=0,.end=0 mean that the ->writepages() implementation
has no way of telling that it is being asked to perform a range
request. Because we're currently overloading (start == 0 && end == 0)
to mean "this is not a write-a-range request".
To make all this sane, the patch changes range of writeback_control.
So caller does: If it is calling ->writepages() to write pages, it
sets range (range_start/end or range_cyclic) always.
And if range_cyclic is true, ->writepages() thinks the range is
cyclic, otherwise it just uses range_start and range_end.
This patch does,
- Add LLONG_MAX, LLONG_MIN, ULLONG_MAX to include/linux/kernel.h
-1 is usually ok for range_end (type is long long). But, if someone did,
range_end += val; range_end is "val - 1"
u64val = range_end >> bits; u64val is "~(0ULL)"
or something, they are wrong. So, this adds LLONG_MAX to avoid nasty
things, and uses LLONG_MAX for range_end.
- All callers of ->writepages() sets range_start/end or range_cyclic.
- Fix updates of ->writeback_index. It seems already bit strange.
If it starts at 0 and ended by check of nr_to_write, this last
index may reduce chance to scan end of file. So, this updates
->writeback_index only if range_cyclic is true or whole-file is
scanned.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Cc: Steven French <sfrench@us.ibm.com>
Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 02:03:26 -07:00
|
|
|
pgoff_t end;
|
2005-10-05 14:50:29 -07:00
|
|
|
pgoff_t index;
|
2007-07-09 18:16:18 -07:00
|
|
|
int range_whole = 0;
|
|
|
|
struct kvec *iov;
|
2005-10-12 15:32:05 -07:00
|
|
|
int len;
|
2005-10-05 14:50:29 -07:00
|
|
|
int n_iov = 0;
|
|
|
|
pgoff_t next;
|
|
|
|
int nr_pages;
|
|
|
|
__u64 offset = 0;
|
2005-10-20 13:44:56 -07:00
|
|
|
struct cifsFileInfo *open_file;
|
2010-09-20 16:01:31 -07:00
|
|
|
struct cifsTconInfo *tcon;
|
2009-04-03 10:44:00 -07:00
|
|
|
struct cifsInodeInfo *cifsi = CIFS_I(mapping->host);
|
2005-10-05 14:50:29 -07:00
|
|
|
struct page *page;
|
|
|
|
struct pagevec pvec;
|
|
|
|
int rc = 0;
|
|
|
|
int scanned = 0;
|
2009-04-03 10:44:00 -07:00
|
|
|
int xid, long_op;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-09-22 16:17:40 -07:00
|
|
|
/*
|
|
|
|
* BB: Is this meaningful for a non-block-device file system?
|
|
|
|
* If it is, we should test it again after we do I/O
|
|
|
|
*/
|
|
|
|
if (wbc->nonblocking && bdi_write_congested(bdi)) {
|
|
|
|
wbc->encountered_congestion = 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-10-05 14:50:29 -07:00
|
|
|
cifs_sb = CIFS_SB(mapping->host->i_sb);
|
2007-07-12 17:33:32 -07:00
|
|
|
|
2005-10-05 14:50:29 -07:00
|
|
|
/*
|
|
|
|
* If wsize is smaller that the page cache size, default to writing
|
|
|
|
* one page at a time via cifs_writepage
|
|
|
|
*/
|
|
|
|
if (cifs_sb->wsize < PAGE_CACHE_SIZE)
|
|
|
|
return generic_writepages(mapping, wbc);
|
|
|
|
|
2007-02-01 21:21:57 -07:00
|
|
|
iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL);
|
2007-07-09 18:16:18 -07:00
|
|
|
if (iov == NULL)
|
2007-02-01 21:21:57 -07:00
|
|
|
return generic_writepages(mapping, wbc);
|
|
|
|
|
2005-10-05 14:50:29 -07:00
|
|
|
/*
|
2010-09-22 16:17:40 -07:00
|
|
|
* if there's no open file, then this is likely to fail too,
|
|
|
|
* but it'll at least handle the return. Maybe it should be
|
|
|
|
* a BUG() instead?
|
2005-10-05 14:50:29 -07:00
|
|
|
*/
|
2010-09-29 16:51:11 -07:00
|
|
|
open_file = find_writable_file(CIFS_I(mapping->host), false);
|
2010-09-22 16:17:40 -07:00
|
|
|
if (!open_file) {
|
2007-02-01 21:21:57 -07:00
|
|
|
kfree(iov);
|
2010-09-22 16:17:40 -07:00
|
|
|
return generic_writepages(mapping, wbc);
|
|
|
|
}
|
|
|
|
|
2010-09-29 16:51:11 -07:00
|
|
|
tcon = tlink_tcon(open_file->tlink);
|
2010-09-22 16:17:40 -07:00
|
|
|
if (!experimEnabled && tcon->ses->server->secMode &
|
|
|
|
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
|
|
|
|
cifsFileInfo_put(open_file);
|
|
|
|
return generic_writepages(mapping, wbc);
|
2005-10-05 14:50:29 -07:00
|
|
|
}
|
2010-09-22 16:17:40 -07:00
|
|
|
cifsFileInfo_put(open_file);
|
2005-10-05 14:50:29 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
xid = GetXid();
|
|
|
|
|
2005-10-05 14:50:29 -07:00
|
|
|
pagevec_init(&pvec, 0);
|
[PATCH] writeback: fix range handling
When a writeback_control's `start' and `end' fields are used to
indicate a one-byte-range starting at file offset zero, the required
values of .start=0,.end=0 mean that the ->writepages() implementation
has no way of telling that it is being asked to perform a range
request. Because we're currently overloading (start == 0 && end == 0)
to mean "this is not a write-a-range request".
To make all this sane, the patch changes range of writeback_control.
So caller does: If it is calling ->writepages() to write pages, it
sets range (range_start/end or range_cyclic) always.
And if range_cyclic is true, ->writepages() thinks the range is
cyclic, otherwise it just uses range_start and range_end.
This patch does,
- Add LLONG_MAX, LLONG_MIN, ULLONG_MAX to include/linux/kernel.h
-1 is usually ok for range_end (type is long long). But, if someone did,
range_end += val; range_end is "val - 1"
u64val = range_end >> bits; u64val is "~(0ULL)"
or something, they are wrong. So, this adds LLONG_MAX to avoid nasty
things, and uses LLONG_MAX for range_end.
- All callers of ->writepages() sets range_start/end or range_cyclic.
- Fix updates of ->writeback_index. It seems already bit strange.
If it starts at 0 and ended by check of nr_to_write, this last
index may reduce chance to scan end of file. So, this updates
->writeback_index only if range_cyclic is true or whole-file is
scanned.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Cc: Steven French <sfrench@us.ibm.com>
Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 02:03:26 -07:00
|
|
|
if (wbc->range_cyclic) {
|
2005-10-05 14:50:29 -07:00
|
|
|
index = mapping->writeback_index; /* Start from prev offset */
|
[PATCH] writeback: fix range handling
When a writeback_control's `start' and `end' fields are used to
indicate a one-byte-range starting at file offset zero, the required
values of .start=0,.end=0 mean that the ->writepages() implementation
has no way of telling that it is being asked to perform a range
request. Because we're currently overloading (start == 0 && end == 0)
to mean "this is not a write-a-range request".
To make all this sane, the patch changes range of writeback_control.
So caller does: If it is calling ->writepages() to write pages, it
sets range (range_start/end or range_cyclic) always.
And if range_cyclic is true, ->writepages() thinks the range is
cyclic, otherwise it just uses range_start and range_end.
This patch does,
- Add LLONG_MAX, LLONG_MIN, ULLONG_MAX to include/linux/kernel.h
-1 is usually ok for range_end (type is long long). But, if someone did,
range_end += val; range_end is "val - 1"
u64val = range_end >> bits; u64val is "~(0ULL)"
or something, they are wrong. So, this adds LLONG_MAX to avoid nasty
things, and uses LLONG_MAX for range_end.
- All callers of ->writepages() sets range_start/end or range_cyclic.
- Fix updates of ->writeback_index. It seems already bit strange.
If it starts at 0 and ended by check of nr_to_write, this last
index may reduce chance to scan end of file. So, this updates
->writeback_index only if range_cyclic is true or whole-file is
scanned.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Cc: Steven French <sfrench@us.ibm.com>
Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 02:03:26 -07:00
|
|
|
end = -1;
|
|
|
|
} else {
|
|
|
|
index = wbc->range_start >> PAGE_CACHE_SHIFT;
|
|
|
|
end = wbc->range_end >> PAGE_CACHE_SHIFT;
|
|
|
|
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
|
|
|
|
range_whole = 1;
|
2005-10-05 14:50:29 -07:00
|
|
|
scanned = 1;
|
|
|
|
}
|
|
|
|
retry:
|
|
|
|
while (!done && (index <= end) &&
|
|
|
|
(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
|
|
|
|
PAGECACHE_TAG_DIRTY,
|
|
|
|
min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) {
|
|
|
|
int first;
|
|
|
|
unsigned int i;
|
|
|
|
|
|
|
|
first = -1;
|
|
|
|
next = 0;
|
|
|
|
n_iov = 0;
|
|
|
|
bytes_to_write = 0;
|
|
|
|
|
|
|
|
for (i = 0; i < nr_pages; i++) {
|
|
|
|
page = pvec.pages[i];
|
|
|
|
/*
|
|
|
|
* At this point we hold neither mapping->tree_lock nor
|
|
|
|
* lock on the page itself: the page may be truncated or
|
|
|
|
* invalidated (changing page->mapping to NULL), or even
|
|
|
|
* swizzled back from swapper_space to tmpfs file
|
|
|
|
* mapping
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (first < 0)
|
|
|
|
lock_page(page);
|
2008-08-02 03:01:03 -07:00
|
|
|
else if (!trylock_page(page))
|
2005-10-05 14:50:29 -07:00
|
|
|
break;
|
|
|
|
|
|
|
|
if (unlikely(page->mapping != mapping)) {
|
|
|
|
unlock_page(page);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
[PATCH] writeback: fix range handling
When a writeback_control's `start' and `end' fields are used to
indicate a one-byte-range starting at file offset zero, the required
values of .start=0,.end=0 mean that the ->writepages() implementation
has no way of telling that it is being asked to perform a range
request. Because we're currently overloading (start == 0 && end == 0)
to mean "this is not a write-a-range request".
To make all this sane, the patch changes range of writeback_control.
So caller does: If it is calling ->writepages() to write pages, it
sets range (range_start/end or range_cyclic) always.
And if range_cyclic is true, ->writepages() thinks the range is
cyclic, otherwise it just uses range_start and range_end.
This patch does,
- Add LLONG_MAX, LLONG_MIN, ULLONG_MAX to include/linux/kernel.h
-1 is usually ok for range_end (type is long long). But, if someone did,
range_end += val; range_end is "val - 1"
u64val = range_end >> bits; u64val is "~(0ULL)"
or something, they are wrong. So, this adds LLONG_MAX to avoid nasty
things, and uses LLONG_MAX for range_end.
- All callers of ->writepages() sets range_start/end or range_cyclic.
- Fix updates of ->writeback_index. It seems already bit strange.
If it starts at 0 and ended by check of nr_to_write, this last
index may reduce chance to scan end of file. So, this updates
->writeback_index only if range_cyclic is true or whole-file is
scanned.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Cc: Steven French <sfrench@us.ibm.com>
Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 02:03:26 -07:00
|
|
|
if (!wbc->range_cyclic && page->index > end) {
|
2005-10-05 14:50:29 -07:00
|
|
|
done = 1;
|
|
|
|
unlock_page(page);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (next && (page->index != next)) {
|
|
|
|
/* Not next consecutive page */
|
|
|
|
unlock_page(page);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (wbc->sync_mode != WB_SYNC_NONE)
|
|
|
|
wait_on_page_writeback(page);
|
|
|
|
|
|
|
|
if (PageWriteback(page) ||
|
2006-12-23 17:19:07 -07:00
|
|
|
!clear_page_dirty_for_io(page)) {
|
2005-10-05 14:50:29 -07:00
|
|
|
unlock_page(page);
|
|
|
|
break;
|
|
|
|
}
|
2005-10-12 15:32:05 -07:00
|
|
|
|
2006-12-23 17:19:07 -07:00
|
|
|
/*
|
|
|
|
* This actually clears the dirty bit in the radix tree.
|
|
|
|
* See cifs_writepage() for more commentary.
|
|
|
|
*/
|
|
|
|
set_page_writeback(page);
|
|
|
|
|
2005-10-12 15:32:05 -07:00
|
|
|
if (page_offset(page) >= mapping->host->i_size) {
|
|
|
|
done = 1;
|
|
|
|
unlock_page(page);
|
2006-12-23 17:19:07 -07:00
|
|
|
end_page_writeback(page);
|
2005-10-12 15:32:05 -07:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2005-10-05 14:50:29 -07:00
|
|
|
/*
|
|
|
|
* BB can we get rid of this? pages are held by pvec
|
|
|
|
*/
|
|
|
|
page_cache_get(page);
|
|
|
|
|
2005-10-12 15:32:05 -07:00
|
|
|
len = min(mapping->host->i_size - page_offset(page),
|
|
|
|
(loff_t)PAGE_CACHE_SIZE);
|
|
|
|
|
2005-10-05 14:50:29 -07:00
|
|
|
/* reserve iov[0] for the smb header */
|
|
|
|
n_iov++;
|
|
|
|
iov[n_iov].iov_base = kmap(page);
|
2005-10-12 15:32:05 -07:00
|
|
|
iov[n_iov].iov_len = len;
|
|
|
|
bytes_to_write += len;
|
2005-10-05 14:50:29 -07:00
|
|
|
|
|
|
|
if (first < 0) {
|
|
|
|
first = i;
|
|
|
|
offset = page_offset(page);
|
|
|
|
}
|
|
|
|
next = page->index + 1;
|
|
|
|
if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (n_iov) {
|
2010-09-29 16:51:11 -07:00
|
|
|
open_file = find_writable_file(CIFS_I(mapping->host),
|
|
|
|
false);
|
2005-10-20 13:44:56 -07:00
|
|
|
if (!open_file) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cERROR(1, "No writable handles for inode");
|
2005-10-20 13:44:56 -07:00
|
|
|
rc = -EBADF;
|
2005-10-11 19:58:06 -07:00
|
|
|
} else {
|
2009-04-03 10:44:00 -07:00
|
|
|
long_op = cifs_write_timeout(cifsi, offset);
|
2010-09-22 16:17:40 -07:00
|
|
|
rc = CIFSSMBWrite2(xid, tcon, open_file->netfid,
|
2005-10-20 13:44:56 -07:00
|
|
|
bytes_to_write, offset,
|
|
|
|
&bytes_written, iov, n_iov,
|
2009-04-03 10:44:00 -07:00
|
|
|
long_op);
|
2009-08-31 08:07:12 -07:00
|
|
|
cifsFileInfo_put(open_file);
|
2009-04-03 10:44:00 -07:00
|
|
|
cifs_update_eof(cifsi, offset, bytes_written);
|
2010-09-22 16:17:40 -07:00
|
|
|
}
|
2009-04-03 10:44:00 -07:00
|
|
|
|
2010-09-22 16:17:40 -07:00
|
|
|
if (rc || bytes_written < bytes_to_write) {
|
|
|
|
cERROR(1, "Write2 ret %d, wrote %d",
|
|
|
|
rc, bytes_written);
|
2010-10-22 11:52:29 -07:00
|
|
|
mapping_set_error(mapping, rc);
|
2010-09-22 16:17:40 -07:00
|
|
|
} else {
|
|
|
|
cifs_stats_bytes_written(tcon, bytes_written);
|
2005-10-05 14:50:29 -07:00
|
|
|
}
|
2010-09-22 16:17:40 -07:00
|
|
|
|
2005-10-05 14:50:29 -07:00
|
|
|
for (i = 0; i < n_iov; i++) {
|
|
|
|
page = pvec.pages[first + i];
|
2006-01-27 16:11:47 -07:00
|
|
|
/* Should we also set page error on
|
|
|
|
success rc but too little data written? */
|
|
|
|
/* BB investigate retry logic on temporary
|
|
|
|
server crash cases and how recovery works
|
2007-07-09 18:16:18 -07:00
|
|
|
when page marked as error */
|
|
|
|
if (rc)
|
2006-01-27 16:11:47 -07:00
|
|
|
SetPageError(page);
|
2005-10-05 14:50:29 -07:00
|
|
|
kunmap(page);
|
|
|
|
unlock_page(page);
|
2006-12-23 17:19:07 -07:00
|
|
|
end_page_writeback(page);
|
2005-10-05 14:50:29 -07:00
|
|
|
page_cache_release(page);
|
|
|
|
}
|
|
|
|
if ((wbc->nr_to_write -= n_iov) <= 0)
|
|
|
|
done = 1;
|
|
|
|
index = next;
|
2008-11-17 20:49:05 -07:00
|
|
|
} else
|
|
|
|
/* Need to re-find the pages we skipped */
|
|
|
|
index = pvec.pages[0]->index + 1;
|
|
|
|
|
2005-10-05 14:50:29 -07:00
|
|
|
pagevec_release(&pvec);
|
|
|
|
}
|
|
|
|
if (!scanned && !done) {
|
|
|
|
/*
|
|
|
|
* We hit the last page and there is more work to be done: wrap
|
|
|
|
* back to the start of the file
|
|
|
|
*/
|
|
|
|
scanned = 1;
|
|
|
|
index = 0;
|
|
|
|
goto retry;
|
|
|
|
}
|
[PATCH] writeback: fix range handling
When a writeback_control's `start' and `end' fields are used to
indicate a one-byte-range starting at file offset zero, the required
values of .start=0,.end=0 mean that the ->writepages() implementation
has no way of telling that it is being asked to perform a range
request. Because we're currently overloading (start == 0 && end == 0)
to mean "this is not a write-a-range request".
To make all this sane, the patch changes range of writeback_control.
So caller does: If it is calling ->writepages() to write pages, it
sets range (range_start/end or range_cyclic) always.
And if range_cyclic is true, ->writepages() thinks the range is
cyclic, otherwise it just uses range_start and range_end.
This patch does,
- Add LLONG_MAX, LLONG_MIN, ULLONG_MAX to include/linux/kernel.h
-1 is usually ok for range_end (type is long long). But, if someone did,
range_end += val; range_end is "val - 1"
u64val = range_end >> bits; u64val is "~(0ULL)"
or something, they are wrong. So, this adds LLONG_MAX to avoid nasty
things, and uses LLONG_MAX for range_end.
- All callers of ->writepages() sets range_start/end or range_cyclic.
- Fix updates of ->writeback_index. It seems already bit strange.
If it starts at 0 and ended by check of nr_to_write, this last
index may reduce chance to scan end of file. So, this updates
->writeback_index only if range_cyclic is true or whole-file is
scanned.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Cc: Steven French <sfrench@us.ibm.com>
Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 02:03:26 -07:00
|
|
|
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
|
2005-10-05 14:50:29 -07:00
|
|
|
mapping->writeback_index = index;
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
2007-02-01 21:21:57 -07:00
|
|
|
kfree(iov);
|
2005-04-16 15:20:36 -07:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
static int cifs_writepage(struct page *page, struct writeback_control *wbc)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
|
|
|
int rc = -EFAULT;
|
|
|
|
int xid;
|
|
|
|
|
|
|
|
xid = GetXid();
|
|
|
|
/* BB add check for wbc flags */
|
|
|
|
page_cache_get(page);
|
2008-02-07 16:25:02 -07:00
|
|
|
if (!PageUptodate(page))
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "ppw - page not up to date");
|
2006-12-23 17:19:07 -07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the "writeback" flag, and clear "dirty" in the radix tree.
|
|
|
|
*
|
|
|
|
* A writepage() implementation always needs to do either this,
|
|
|
|
* or re-dirty the page with "redirty_page_for_writepage()" in
|
|
|
|
* the case of a failure.
|
|
|
|
*
|
|
|
|
* Just unlocking the page will cause the radix tree tag-bits
|
|
|
|
* to fail to update with the state of the page correctly.
|
|
|
|
*/
|
2007-07-09 18:16:18 -07:00
|
|
|
set_page_writeback(page);
|
2005-04-16 15:20:36 -07:00
|
|
|
rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
|
|
|
|
SetPageUptodate(page); /* BB add check for error and Clearuptodate? */
|
|
|
|
unlock_page(page);
|
2006-12-23 17:19:07 -07:00
|
|
|
end_page_writeback(page);
|
|
|
|
page_cache_release(page);
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2008-09-24 08:32:59 -07:00
|
|
|
static int cifs_write_end(struct file *file, struct address_space *mapping,
|
|
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
|
|
struct page *page, void *fsdata)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
2008-09-24 08:32:59 -07:00
|
|
|
int rc;
|
|
|
|
struct inode *inode = mapping->host;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "write_end for page %p from pos %lld with %d bytes",
|
|
|
|
page, pos, copied);
|
2008-09-24 08:32:59 -07:00
|
|
|
|
2008-11-26 12:32:33 -07:00
|
|
|
if (PageChecked(page)) {
|
|
|
|
if (copied == len)
|
|
|
|
SetPageUptodate(page);
|
|
|
|
ClearPageChecked(page);
|
|
|
|
} else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
|
2008-09-24 08:32:59 -07:00
|
|
|
SetPageUptodate(page);
|
2008-02-07 16:25:02 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
if (!PageUptodate(page)) {
|
2008-09-24 08:32:59 -07:00
|
|
|
char *page_data;
|
|
|
|
unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
|
|
int xid;
|
|
|
|
|
|
|
|
xid = GetXid();
|
2005-04-16 15:20:36 -07:00
|
|
|
/* this is probably better than directly calling
|
|
|
|
partialpage_write since in this function the file handle is
|
|
|
|
known which we might as well leverage */
|
|
|
|
/* BB check if anything else missing out of ppw
|
|
|
|
such as updating last write time */
|
|
|
|
page_data = kmap(page);
|
2010-10-15 12:34:00 -07:00
|
|
|
rc = cifs_write(file->private_data, page_data + offset,
|
|
|
|
copied, &pos);
|
2008-09-24 08:32:59 -07:00
|
|
|
/* if (rc < 0) should we set writebehind rc? */
|
2005-04-16 15:20:36 -07:00
|
|
|
kunmap(page);
|
2008-09-24 08:32:59 -07:00
|
|
|
|
|
|
|
FreeXid(xid);
|
2007-07-09 18:16:18 -07:00
|
|
|
} else {
|
2008-09-24 08:32:59 -07:00
|
|
|
rc = copied;
|
|
|
|
pos += copied;
|
2005-04-16 15:20:36 -07:00
|
|
|
set_page_dirty(page);
|
|
|
|
}
|
|
|
|
|
2008-09-24 08:32:59 -07:00
|
|
|
if (rc > 0) {
|
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
if (pos > inode->i_size)
|
|
|
|
i_size_write(inode, pos);
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
unlock_page(page);
|
|
|
|
page_cache_release(page);
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2010-05-26 08:53:25 -07:00
|
|
|
int cifs_fsync(struct file *file, int datasync)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
|
|
|
int xid;
|
|
|
|
int rc = 0;
|
2009-02-21 14:17:43 -07:00
|
|
|
struct cifsTconInfo *tcon;
|
2010-07-12 13:50:14 -07:00
|
|
|
struct cifsFileInfo *smbfile = file->private_data;
|
2006-12-08 03:36:48 -07:00
|
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
xid = GetXid();
|
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Sync file - name: %s datasync: 0x%x",
|
2010-05-26 08:53:25 -07:00
|
|
|
file->f_path.dentry->d_name.name, datasync);
|
2007-07-12 17:33:32 -07:00
|
|
|
|
[CIFS] Fix potential data corruption when writing out cached dirty pages
Fix RedHat bug 329431
The idea here is separate "conscious" from "unconscious" flushes.
Conscious flushes are those due to a fsync() or close(). Unconscious
ones are flushes that occur as a side effect of some other operation or
due to memory pressure.
Currently, when an error occurs during an unconscious flush (ENOSPC or
EIO), we toss out the page and don't preserve that error to report to
the user when a conscious flush occurs. If after the unconscious flush,
there are no more dirty pages for the inode, the conscious flush will
simply return success even though there were previous errors when writing
out pages. This can lead to data corruption.
The easiest way to reproduce this is to mount up a CIFS share that's
very close to being full or where the user is very close to quota. mv
a file to the share that's slightly larger than the quota allows. The
writes will all succeed (since they go to pagecache). The mv will do a
setattr to set the new file's attributes. This calls
filemap_write_and_wait,
which will return an error since all of the pages can't be written out.
Then later, when the flush and release ops occur, there are no more
dirty pages in pagecache for the file and those operations return 0. mv
then assumes that the file was written out correctly and deletes the
original.
CIFS already has a write_behind_rc variable where it stores the results
from earlier flushes, but that value is only reported in cifs_close.
Since the VFS ignores the return value from the release operation, this
isn't helpful. We should be reporting this error during the flush
operation.
This patch does the following:
1) changes cifs_fsync to use filemap_write_and_wait and cifs_flush and also
sync to check its return code. If it returns successful, they then check
the value of write_behind_rc to see if an earlier flush had reported any
errors. If so, they return that error and clear write_behind_rc.
2) sets write_behind_rc in a few other places where pages are written
out as a side effect of other operations and the code waits on them.
3) changes cifs_setattr to only call filemap_write_and_wait for
ATTR_SIZE changes.
4) makes cifs_writepages accurately distinguish between EIO and ENOSPC
errors when writing out pages.
Some simple testing indicates that the patch works as expected and that
it fixes the reproduceable known problem.
Acked-by: Dave Kleikamp <shaggy@austin.rr.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
2007-11-20 16:19:03 -07:00
|
|
|
rc = filemap_write_and_wait(inode->i_mapping);
|
|
|
|
if (rc == 0) {
|
2010-10-22 11:52:29 -07:00
|
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
|
|
|
2010-09-29 16:51:11 -07:00
|
|
|
tcon = tlink_tcon(smbfile->tlink);
|
2010-10-22 11:52:29 -07:00
|
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
|
2009-02-21 14:17:43 -07:00
|
|
|
rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
|
[CIFS] Fix potential data corruption when writing out cached dirty pages
Fix RedHat bug 329431
The idea here is separate "conscious" from "unconscious" flushes.
Conscious flushes are those due to a fsync() or close(). Unconscious
ones are flushes that occur as a side effect of some other operation or
due to memory pressure.
Currently, when an error occurs during an unconscious flush (ENOSPC or
EIO), we toss out the page and don't preserve that error to report to
the user when a conscious flush occurs. If after the unconscious flush,
there are no more dirty pages for the inode, the conscious flush will
simply return success even though there were previous errors when writing
out pages. This can lead to data corruption.
The easiest way to reproduce this is to mount up a CIFS share that's
very close to being full or where the user is very close to quota. mv
a file to the share that's slightly larger than the quota allows. The
writes will all succeed (since they go to pagecache). The mv will do a
setattr to set the new file's attributes. This calls
filemap_write_and_wait,
which will return an error since all of the pages can't be written out.
Then later, when the flush and release ops occur, there are no more
dirty pages in pagecache for the file and those operations return 0. mv
then assumes that the file was written out correctly and deletes the
original.
CIFS already has a write_behind_rc variable where it stores the results
from earlier flushes, but that value is only reported in cifs_close.
Since the VFS ignores the return value from the release operation, this
isn't helpful. We should be reporting this error during the flush
operation.
This patch does the following:
1) changes cifs_fsync to use filemap_write_and_wait and cifs_flush and also
sync to check its return code. If it returns successful, they then check
the value of write_behind_rc to see if an earlier flush had reported any
errors. If so, they return that error and clear write_behind_rc.
2) sets write_behind_rc in a few other places where pages are written
out as a side effect of other operations and the code waits on them.
3) changes cifs_setattr to only call filemap_write_and_wait for
ATTR_SIZE changes.
4) makes cifs_writepages accurately distinguish between EIO and ENOSPC
errors when writing out pages.
Some simple testing indicates that the patch works as expected and that
it fixes the reproduceable known problem.
Acked-by: Dave Kleikamp <shaggy@austin.rr.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
2007-11-20 16:19:03 -07:00
|
|
|
}
|
2009-02-21 14:17:43 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2006-03-26 02:37:17 -07:00
|
|
|
/* static void cifs_sync_page(struct page *page)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
|
|
|
struct address_space *mapping;
|
|
|
|
struct inode *inode;
|
|
|
|
unsigned long index = page->index;
|
|
|
|
unsigned int rpages = 0;
|
|
|
|
int rc = 0;
|
|
|
|
|
2010-04-20 21:12:10 -07:00
|
|
|
cFYI(1, "sync page %p", page);
|
2005-04-16 15:20:36 -07:00
|
|
|
mapping = page->mapping;
|
|
|
|
if (!mapping)
|
|
|
|
return 0;
|
|
|
|
inode = mapping->host;
|
|
|
|
if (!inode)
|
2006-03-26 02:37:17 -07:00
|
|
|
return; */
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
/* fill in rpages then
|
2005-04-16 15:20:36 -07:00
|
|
|
result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
|
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
/* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2006-03-26 02:37:17 -07:00
|
|
|
#if 0
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc < 0)
|
|
|
|
return rc;
|
|
|
|
return 0;
|
2006-03-26 02:37:17 -07:00
|
|
|
#endif
|
2005-04-16 15:20:36 -07:00
|
|
|
} */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* As file closes, flush all cached write data for this inode checking
|
|
|
|
* for write behind errors.
|
|
|
|
*/
|
2006-06-23 02:05:12 -07:00
|
|
|
int cifs_flush(struct file *file, fl_owner_t id)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
2007-07-09 18:16:18 -07:00
|
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
2005-04-16 15:20:36 -07:00
|
|
|
int rc = 0;
|
|
|
|
|
2010-10-22 11:52:29 -07:00
|
|
|
if (file->f_mode & FMODE_WRITE)
|
2010-10-15 12:34:07 -07:00
|
|
|
rc = filemap_write_and_wait(inode->i_mapping);
|
2007-07-12 17:33:32 -07:00
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
ssize_t cifs_user_read(struct file *file, char __user *read_data,
|
|
|
|
size_t read_size, loff_t *poffset)
|
|
|
|
{
|
|
|
|
int rc = -EACCES;
|
|
|
|
unsigned int bytes_read = 0;
|
|
|
|
unsigned int total_read = 0;
|
|
|
|
unsigned int current_read_size;
|
|
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
struct cifsTconInfo *pTcon;
|
|
|
|
int xid;
|
|
|
|
struct cifsFileInfo *open_file;
|
|
|
|
char *smb_read_data;
|
|
|
|
char __user *current_offset;
|
|
|
|
struct smb_com_read_rsp *pSMBr;
|
|
|
|
|
|
|
|
xid = GetXid();
|
2006-12-08 03:36:48 -07:00
|
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if (file->private_data == NULL) {
|
2009-06-25 05:42:34 -07:00
|
|
|
rc = -EBADF;
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
2009-06-25 05:42:34 -07:00
|
|
|
return rc;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2010-07-12 13:50:14 -07:00
|
|
|
open_file = file->private_data;
|
2010-09-29 16:51:11 -07:00
|
|
|
pTcon = tlink_tcon(open_file->tlink);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2008-02-07 16:25:02 -07:00
|
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "attempting read on write only file instance");
|
2008-02-07 16:25:02 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
for (total_read = 0, current_offset = read_data;
|
|
|
|
read_size > total_read;
|
|
|
|
total_read += bytes_read, current_offset += bytes_read) {
|
2007-07-09 18:16:18 -07:00
|
|
|
current_read_size = min_t(const int, read_size - total_read,
|
2005-04-16 15:20:36 -07:00
|
|
|
cifs_sb->rsize);
|
|
|
|
rc = -EAGAIN;
|
|
|
|
smb_read_data = NULL;
|
|
|
|
while (rc == -EAGAIN) {
|
2005-12-12 21:53:18 -07:00
|
|
|
int buf_type = CIFS_NO_BUFFER;
|
2010-10-21 15:46:14 -07:00
|
|
|
if (open_file->invalidHandle) {
|
2010-10-15 12:33:59 -07:00
|
|
|
rc = cifs_reopen_file(open_file, true);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc != 0)
|
|
|
|
break;
|
|
|
|
}
|
2005-08-31 21:50:37 -07:00
|
|
|
rc = CIFSSMBRead(xid, pTcon,
|
2005-12-12 21:53:18 -07:00
|
|
|
open_file->netfid,
|
|
|
|
current_read_size, *poffset,
|
|
|
|
&bytes_read, &smb_read_data,
|
|
|
|
&buf_type);
|
2005-04-16 15:20:36 -07:00
|
|
|
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
|
|
|
|
if (smb_read_data) {
|
2006-02-14 21:30:52 -07:00
|
|
|
if (copy_to_user(current_offset,
|
|
|
|
smb_read_data +
|
|
|
|
4 /* RFC1001 length field */ +
|
|
|
|
le16_to_cpu(pSMBr->DataOffset),
|
2008-02-07 16:25:02 -07:00
|
|
|
bytes_read))
|
2006-02-14 21:30:52 -07:00
|
|
|
rc = -EFAULT;
|
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
2005-12-12 21:53:18 -07:00
|
|
|
cifs_small_buf_release(smb_read_data);
|
2007-07-09 18:16:18 -07:00
|
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
2005-12-12 21:53:18 -07:00
|
|
|
cifs_buf_release(smb_read_data);
|
2005-04-16 15:20:36 -07:00
|
|
|
smb_read_data = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (rc || (bytes_read == 0)) {
|
|
|
|
if (total_read) {
|
|
|
|
break;
|
|
|
|
} else {
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
} else {
|
2005-08-24 13:59:35 -07:00
|
|
|
cifs_stats_bytes_read(pTcon, bytes_read);
|
2005-04-16 15:20:36 -07:00
|
|
|
*poffset += bytes_read;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
FreeXid(xid);
|
|
|
|
return total_read;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
|
|
|
|
loff_t *poffset)
|
|
|
|
{
|
|
|
|
int rc = -EACCES;
|
|
|
|
unsigned int bytes_read = 0;
|
|
|
|
unsigned int total_read;
|
|
|
|
unsigned int current_read_size;
|
|
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
struct cifsTconInfo *pTcon;
|
|
|
|
int xid;
|
|
|
|
char *current_offset;
|
|
|
|
struct cifsFileInfo *open_file;
|
2005-12-12 21:53:18 -07:00
|
|
|
int buf_type = CIFS_NO_BUFFER;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
xid = GetXid();
|
2006-12-08 03:36:48 -07:00
|
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if (file->private_data == NULL) {
|
2009-06-25 05:42:34 -07:00
|
|
|
rc = -EBADF;
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
2009-06-25 05:42:34 -07:00
|
|
|
return rc;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2010-07-12 13:50:14 -07:00
|
|
|
open_file = file->private_data;
|
2010-09-29 16:51:11 -07:00
|
|
|
pTcon = tlink_tcon(open_file->tlink);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "attempting read on write only file instance");
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
for (total_read = 0, current_offset = read_data;
|
2005-04-16 15:20:36 -07:00
|
|
|
read_size > total_read;
|
|
|
|
total_read += bytes_read, current_offset += bytes_read) {
|
|
|
|
current_read_size = min_t(const int, read_size - total_read,
|
|
|
|
cifs_sb->rsize);
|
2005-09-15 23:06:38 -07:00
|
|
|
/* For windows me and 9x we do not want to request more
|
|
|
|
than it negotiated since it will refuse the read then */
|
2007-07-09 18:16:18 -07:00
|
|
|
if ((pTcon->ses) &&
|
2005-09-15 23:06:38 -07:00
|
|
|
!(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
|
|
|
|
current_read_size = min_t(const int, current_read_size,
|
|
|
|
pTcon->ses->server->maxBuf - 128);
|
|
|
|
}
|
2005-04-16 15:20:36 -07:00
|
|
|
rc = -EAGAIN;
|
|
|
|
while (rc == -EAGAIN) {
|
2010-10-21 15:46:14 -07:00
|
|
|
if (open_file->invalidHandle) {
|
2010-10-15 12:33:59 -07:00
|
|
|
rc = cifs_reopen_file(open_file, true);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc != 0)
|
|
|
|
break;
|
|
|
|
}
|
2005-08-31 21:50:37 -07:00
|
|
|
rc = CIFSSMBRead(xid, pTcon,
|
2005-12-12 21:53:18 -07:00
|
|
|
open_file->netfid,
|
|
|
|
current_read_size, *poffset,
|
|
|
|
&bytes_read, ¤t_offset,
|
|
|
|
&buf_type);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
if (rc || (bytes_read == 0)) {
|
|
|
|
if (total_read) {
|
|
|
|
break;
|
|
|
|
} else {
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
} else {
|
2005-08-24 13:59:35 -07:00
|
|
|
cifs_stats_bytes_read(pTcon, total_read);
|
2005-04-16 15:20:36 -07:00
|
|
|
*poffset += bytes_read;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
FreeXid(xid);
|
|
|
|
return total_read;
|
|
|
|
}
|
|
|
|
|
|
|
|
int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
|
|
|
{
|
|
|
|
int rc, xid;
|
|
|
|
|
|
|
|
xid = GetXid();
|
2010-02-12 05:44:18 -07:00
|
|
|
rc = cifs_revalidate_file(file);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Validation prior to mmap failed, error=%d", rc);
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
rc = generic_file_mmap(file, vma);
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
static void cifs_copy_cache_pages(struct address_space *mapping,
|
2010-04-20 20:18:28 -07:00
|
|
|
struct list_head *pages, int bytes_read, char *data)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
|
|
|
struct page *page;
|
|
|
|
char *target;
|
|
|
|
|
|
|
|
while (bytes_read > 0) {
|
|
|
|
if (list_empty(pages))
|
|
|
|
break;
|
|
|
|
|
|
|
|
page = list_entry(pages->prev, struct page, lru);
|
|
|
|
list_del(&page->lru);
|
|
|
|
|
2010-04-20 20:18:28 -07:00
|
|
|
if (add_to_page_cache_lru(page, mapping, page->index,
|
2005-04-16 15:20:36 -07:00
|
|
|
GFP_KERNEL)) {
|
|
|
|
page_cache_release(page);
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Add page cache failed");
|
2005-06-09 14:44:07 -07:00
|
|
|
data += PAGE_CACHE_SIZE;
|
|
|
|
bytes_read -= PAGE_CACHE_SIZE;
|
2005-04-16 15:20:36 -07:00
|
|
|
continue;
|
|
|
|
}
|
2010-06-01 07:54:45 -07:00
|
|
|
page_cache_release(page);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
target = kmap_atomic(page, KM_USER0);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
if (PAGE_CACHE_SIZE > bytes_read) {
|
|
|
|
memcpy(target, data, bytes_read);
|
|
|
|
/* zero the tail end of this partial page */
|
2007-07-09 18:16:18 -07:00
|
|
|
memset(target + bytes_read, 0,
|
2005-04-16 15:20:36 -07:00
|
|
|
PAGE_CACHE_SIZE - bytes_read);
|
|
|
|
bytes_read = 0;
|
|
|
|
} else {
|
|
|
|
memcpy(target, data, PAGE_CACHE_SIZE);
|
|
|
|
bytes_read -= PAGE_CACHE_SIZE;
|
|
|
|
}
|
|
|
|
kunmap_atomic(target, KM_USER0);
|
|
|
|
|
|
|
|
flush_dcache_page(page);
|
|
|
|
SetPageUptodate(page);
|
|
|
|
unlock_page(page);
|
|
|
|
data += PAGE_CACHE_SIZE;
|
2010-07-05 05:43:11 -07:00
|
|
|
|
|
|
|
/* add page to FS-Cache */
|
|
|
|
cifs_readpage_to_fscache(mapping->host, page);
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cifs_readpages(struct file *file, struct address_space *mapping,
|
|
|
|
struct list_head *page_list, unsigned num_pages)
|
|
|
|
{
|
|
|
|
int rc = -EACCES;
|
|
|
|
int xid;
|
|
|
|
loff_t offset;
|
|
|
|
struct page *page;
|
|
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
struct cifsTconInfo *pTcon;
|
2007-10-12 12:10:28 -07:00
|
|
|
unsigned int bytes_read = 0;
|
2007-07-09 18:16:18 -07:00
|
|
|
unsigned int read_size, i;
|
2005-04-16 15:20:36 -07:00
|
|
|
char *smb_read_data = NULL;
|
|
|
|
struct smb_com_read_rsp *pSMBr;
|
|
|
|
struct cifsFileInfo *open_file;
|
2005-12-12 21:53:18 -07:00
|
|
|
int buf_type = CIFS_NO_BUFFER;
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
xid = GetXid();
|
|
|
|
if (file->private_data == NULL) {
|
2009-06-25 05:42:34 -07:00
|
|
|
rc = -EBADF;
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
2009-06-25 05:42:34 -07:00
|
|
|
return rc;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2010-07-12 13:50:14 -07:00
|
|
|
open_file = file->private_data;
|
2006-12-08 03:36:48 -07:00
|
|
|
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
|
2010-09-29 16:51:11 -07:00
|
|
|
pTcon = tlink_tcon(open_file->tlink);
|
2005-08-31 21:50:37 -07:00
|
|
|
|
2010-07-05 05:43:25 -07:00
|
|
|
/*
|
|
|
|
* Reads as many pages as possible from fscache. Returns -ENOBUFS
|
|
|
|
* immediately if the cookie is negative
|
|
|
|
*/
|
|
|
|
rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
|
|
|
|
&num_pages);
|
|
|
|
if (rc == 0)
|
|
|
|
goto read_complete;
|
|
|
|
|
2010-04-20 21:12:10 -07:00
|
|
|
cFYI(DBG2, "rpages: num pages %d", num_pages);
|
2005-04-16 15:20:36 -07:00
|
|
|
for (i = 0; i < num_pages; ) {
|
|
|
|
unsigned contig_pages;
|
|
|
|
struct page *tmp_page;
|
|
|
|
unsigned long expected_index;
|
|
|
|
|
|
|
|
if (list_empty(page_list))
|
|
|
|
break;
|
|
|
|
|
|
|
|
page = list_entry(page_list->prev, struct page, lru);
|
|
|
|
offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
|
|
|
|
|
|
|
/* count adjacent pages that we will read into */
|
|
|
|
contig_pages = 0;
|
2007-07-09 18:16:18 -07:00
|
|
|
expected_index =
|
2005-04-16 15:20:36 -07:00
|
|
|
list_entry(page_list->prev, struct page, lru)->index;
|
2007-07-09 18:16:18 -07:00
|
|
|
list_for_each_entry_reverse(tmp_page, page_list, lru) {
|
2005-04-16 15:20:36 -07:00
|
|
|
if (tmp_page->index == expected_index) {
|
|
|
|
contig_pages++;
|
|
|
|
expected_index++;
|
|
|
|
} else
|
2007-07-09 18:16:18 -07:00
|
|
|
break;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
if (contig_pages + i > num_pages)
|
|
|
|
contig_pages = num_pages - i;
|
|
|
|
|
|
|
|
/* for reads over a certain size could initiate async
|
|
|
|
read ahead */
|
|
|
|
|
|
|
|
read_size = contig_pages * PAGE_CACHE_SIZE;
|
|
|
|
/* Read size needs to be in multiples of one page */
|
|
|
|
read_size = min_t(const unsigned int, read_size,
|
|
|
|
cifs_sb->rsize & PAGE_CACHE_MASK);
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d",
|
|
|
|
read_size, contig_pages);
|
2005-04-16 15:20:36 -07:00
|
|
|
rc = -EAGAIN;
|
|
|
|
while (rc == -EAGAIN) {
|
2010-10-21 15:46:14 -07:00
|
|
|
if (open_file->invalidHandle) {
|
2010-10-15 12:33:59 -07:00
|
|
|
rc = cifs_reopen_file(open_file, true);
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc != 0)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2005-08-31 21:50:37 -07:00
|
|
|
rc = CIFSSMBRead(xid, pTcon,
|
2005-12-12 21:53:18 -07:00
|
|
|
open_file->netfid,
|
|
|
|
read_size, offset,
|
|
|
|
&bytes_read, &smb_read_data,
|
|
|
|
&buf_type);
|
2005-08-24 23:06:05 -07:00
|
|
|
/* BB more RC checks ? */
|
2007-07-09 18:16:18 -07:00
|
|
|
if (rc == -EAGAIN) {
|
2005-04-16 15:20:36 -07:00
|
|
|
if (smb_read_data) {
|
2007-07-09 18:16:18 -07:00
|
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
2005-12-12 21:53:18 -07:00
|
|
|
cifs_small_buf_release(smb_read_data);
|
2007-07-09 18:16:18 -07:00
|
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
2005-12-12 21:53:18 -07:00
|
|
|
cifs_buf_release(smb_read_data);
|
2005-04-16 15:20:36 -07:00
|
|
|
smb_read_data = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if ((rc < 0) || (smb_read_data == NULL)) {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Read error in readpages: %d", rc);
|
2005-04-16 15:20:36 -07:00
|
|
|
break;
|
|
|
|
} else if (bytes_read > 0) {
|
2006-12-10 03:19:44 -07:00
|
|
|
task_io_account_read(bytes_read);
|
2005-04-16 15:20:36 -07:00
|
|
|
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
|
|
|
|
cifs_copy_cache_pages(mapping, page_list, bytes_read,
|
|
|
|
smb_read_data + 4 /* RFC1001 hdr */ +
|
2010-04-20 20:18:28 -07:00
|
|
|
le16_to_cpu(pSMBr->DataOffset));
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
i += bytes_read >> PAGE_CACHE_SHIFT;
|
2005-08-24 13:59:35 -07:00
|
|
|
cifs_stats_bytes_read(pTcon, bytes_read);
|
2007-10-12 12:10:28 -07:00
|
|
|
if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) {
|
2005-04-16 15:20:36 -07:00
|
|
|
i++; /* account for partial page */
|
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
/* server copy of file can have smaller size
|
2005-04-16 15:20:36 -07:00
|
|
|
than client */
|
2007-07-09 18:16:18 -07:00
|
|
|
/* BB do we need to verify this common case ?
|
|
|
|
this case is ok - if we are at server EOF
|
2005-04-16 15:20:36 -07:00
|
|
|
we will hit it on next read */
|
|
|
|
|
2006-11-02 23:07:08 -07:00
|
|
|
/* break; */
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
} else {
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "No bytes read (%d) at offset %lld . "
|
2010-04-20 21:12:10 -07:00
|
|
|
"Cleaning remaining pages from readahead list",
|
2010-04-20 20:50:45 -07:00
|
|
|
bytes_read, offset);
|
2007-07-09 18:16:18 -07:00
|
|
|
/* BB turn off caching and do new lookup on
|
2005-04-16 15:20:36 -07:00
|
|
|
file size at server? */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (smb_read_data) {
|
2007-07-09 18:16:18 -07:00
|
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
2005-12-12 21:53:18 -07:00
|
|
|
cifs_small_buf_release(smb_read_data);
|
2007-07-09 18:16:18 -07:00
|
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
2005-12-12 21:53:18 -07:00
|
|
|
cifs_buf_release(smb_read_data);
|
2005-04-16 15:20:36 -07:00
|
|
|
smb_read_data = NULL;
|
|
|
|
}
|
|
|
|
bytes_read = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* need to free smb_read_data buf before exit */
|
|
|
|
if (smb_read_data) {
|
2007-07-09 18:16:18 -07:00
|
|
|
if (buf_type == CIFS_SMALL_BUFFER)
|
2006-01-18 15:20:39 -07:00
|
|
|
cifs_small_buf_release(smb_read_data);
|
2007-07-09 18:16:18 -07:00
|
|
|
else if (buf_type == CIFS_LARGE_BUFFER)
|
2006-01-18 15:20:39 -07:00
|
|
|
cifs_buf_release(smb_read_data);
|
2005-04-16 15:20:36 -07:00
|
|
|
smb_read_data = NULL;
|
2007-07-09 18:16:18 -07:00
|
|
|
}
|
2005-04-16 15:20:36 -07:00
|
|
|
|
2010-07-05 05:43:25 -07:00
|
|
|
read_complete:
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cifs_readpage_worker(struct file *file, struct page *page,
|
|
|
|
loff_t *poffset)
|
|
|
|
{
|
|
|
|
char *read_data;
|
|
|
|
int rc;
|
|
|
|
|
2010-07-05 05:43:25 -07:00
|
|
|
/* Is the page cached? */
|
|
|
|
rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page);
|
|
|
|
if (rc == 0)
|
|
|
|
goto read_complete;
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
page_cache_get(page);
|
|
|
|
read_data = kmap(page);
|
|
|
|
/* for reads over a certain size could initiate async read ahead */
|
2007-07-09 18:16:18 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
|
2007-07-09 18:16:18 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
if (rc < 0)
|
|
|
|
goto io_error;
|
|
|
|
else
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Bytes read %d", rc);
|
2007-07-09 18:16:18 -07:00
|
|
|
|
2006-12-08 03:36:48 -07:00
|
|
|
file->f_path.dentry->d_inode->i_atime =
|
|
|
|
current_fs_time(file->f_path.dentry->d_inode->i_sb);
|
2007-07-09 18:16:18 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
if (PAGE_CACHE_SIZE > rc)
|
|
|
|
memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
|
|
|
|
|
|
|
|
flush_dcache_page(page);
|
|
|
|
SetPageUptodate(page);
|
2010-07-05 05:43:11 -07:00
|
|
|
|
|
|
|
/* send this page to the cache */
|
|
|
|
cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page);
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
rc = 0;
|
2007-07-09 18:16:18 -07:00
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
io_error:
|
2007-07-09 18:16:18 -07:00
|
|
|
kunmap(page);
|
2005-04-16 15:20:36 -07:00
|
|
|
page_cache_release(page);
|
2010-07-05 05:43:25 -07:00
|
|
|
|
|
|
|
read_complete:
|
2005-04-16 15:20:36 -07:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cifs_readpage(struct file *file, struct page *page)
|
|
|
|
{
|
|
|
|
loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
|
|
|
int rc = -EACCES;
|
|
|
|
int xid;
|
|
|
|
|
|
|
|
xid = GetXid();
|
|
|
|
|
|
|
|
if (file->private_data == NULL) {
|
2009-06-25 05:42:34 -07:00
|
|
|
rc = -EBADF;
|
2005-04-16 15:20:36 -07:00
|
|
|
FreeXid(xid);
|
2009-06-25 05:42:34 -07:00
|
|
|
return rc;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "readpage %p at offset %d 0x%x\n",
|
|
|
|
page, (int)offset, (int)offset);
|
2005-04-16 15:20:36 -07:00
|
|
|
|
|
|
|
rc = cifs_readpage_worker(file, page, &offset);
|
|
|
|
|
|
|
|
unlock_page(page);
|
|
|
|
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2007-07-26 08:54:16 -07:00
|
|
|
static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
|
|
|
|
{
|
|
|
|
struct cifsFileInfo *open_file;
|
|
|
|
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_lock(&cifs_file_list_lock);
|
2007-07-26 08:54:16 -07:00
|
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
2010-10-15 12:34:01 -07:00
|
|
|
if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) {
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2007-07-26 08:54:16 -07:00
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
}
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2007-07-26 08:54:16 -07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-16 15:20:36 -07:00
|
|
|
/* We do not want to update the file size from server for inodes
|
|
|
|
open for write - to avoid races with writepage extending
|
|
|
|
the file - in the future we could consider allowing
|
2007-07-09 18:16:18 -07:00
|
|
|
refreshing the inode only on increases in the file size
|
2005-04-16 15:20:36 -07:00
|
|
|
but this is tricky to do without racing with writebehind
|
|
|
|
page caching in the current Linux kernel design */
|
2008-04-28 17:06:05 -07:00
|
|
|
bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
2007-07-26 08:54:16 -07:00
|
|
|
if (!cifsInode)
|
2008-04-28 17:06:05 -07:00
|
|
|
return true;
|
2007-07-12 17:33:32 -07:00
|
|
|
|
2007-07-26 08:54:16 -07:00
|
|
|
if (is_inode_writable(cifsInode)) {
|
|
|
|
/* This inode is open for write at least once */
|
2006-01-12 15:41:28 -07:00
|
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
|
|
|
|
cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
|
2008-02-07 16:25:02 -07:00
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
|
2007-07-09 18:16:18 -07:00
|
|
|
/* since no page cache to corrupt on directio
|
2006-01-12 15:41:28 -07:00
|
|
|
we can change size safely */
|
2008-04-28 17:06:05 -07:00
|
|
|
return true;
|
2006-01-12 15:41:28 -07:00
|
|
|
}
|
|
|
|
|
2007-07-09 18:16:18 -07:00
|
|
|
if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
|
2008-04-28 17:06:05 -07:00
|
|
|
return true;
|
2007-02-08 11:14:13 -07:00
|
|
|
|
2008-04-28 17:06:05 -07:00
|
|
|
return false;
|
2005-10-20 13:44:56 -07:00
|
|
|
} else
|
2008-04-28 17:06:05 -07:00
|
|
|
return true;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
2008-09-24 08:32:59 -07:00
|
|
|
static int cifs_write_begin(struct file *file, struct address_space *mapping,
|
|
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
|
|
struct page **pagep, void **fsdata)
|
2005-04-16 15:20:36 -07:00
|
|
|
{
|
2008-09-24 08:32:59 -07:00
|
|
|
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
|
|
|
|
loff_t offset = pos & (PAGE_CACHE_SIZE - 1);
|
2008-11-26 12:32:33 -07:00
|
|
|
loff_t page_start = pos & PAGE_MASK;
|
|
|
|
loff_t i_size;
|
|
|
|
struct page *page;
|
|
|
|
int rc = 0;
|
2008-09-24 08:32:59 -07:00
|
|
|
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "write_begin from %lld len %d", (long long)pos, len);
|
2008-09-24 08:32:59 -07:00
|
|
|
|
fs: symlink write_begin allocation context fix
With the write_begin/write_end aops, page_symlink was broken because it
could no longer pass a GFP_NOFS type mask into the point where the
allocations happened. They are done in write_begin, which would always
assume that the filesystem can be entered from reclaim. This bug could
cause filesystem deadlocks.
The funny thing with having a gfp_t mask there is that it doesn't really
allow the caller to arbitrarily tinker with the context in which it can be
called. It couldn't ever be GFP_ATOMIC, for example, because it needs to
take the page lock. The only thing any callers care about is __GFP_FS
anyway, so turn that into a single flag.
Add a new flag for write_begin, AOP_FLAG_NOFS. Filesystems can now act on
this flag in their write_begin function. Change __grab_cache_page to
accept a nofs argument as well, to honour that flag (while we're there,
change the name to grab_cache_page_write_begin which is more instructive
and does away with random leading underscores).
This is really a more flexible way to go in the end anyway -- if a
filesystem happens to want any extra allocations aside from the pagecache
ones in ints write_begin function, it may now use GFP_KERNEL (rather than
GFP_NOFS) for common case allocations (eg. ocfs2_alloc_write_ctxt, for a
random example).
[kosaki.motohiro@jp.fujitsu.com: fix ubifs]
[kosaki.motohiro@jp.fujitsu.com: fix fuse]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: <stable@kernel.org> [2.6.28.x]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ Cleaned up the calling convention: just pass in the AOP flags
untouched to the grab_cache_page_write_begin() function. That
just simplifies everybody, and may even allow future expansion of the
logic. - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-04 13:00:53 -07:00
|
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
2008-11-26 12:32:33 -07:00
|
|
|
if (!page) {
|
|
|
|
rc = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
2007-03-05 17:31:00 -07:00
|
|
|
|
2008-11-26 12:32:33 -07:00
|
|
|
if (PageUptodate(page))
|
|
|
|
goto out;
|
2007-03-05 17:31:00 -07:00
|
|
|
|
2008-11-26 12:32:33 -07:00
|
|
|
/*
|
|
|
|
* If we write a full page it will be up to date, no need to read from
|
|
|
|
* the server. If the write is short, we'll end up doing a sync write
|
|
|
|
* instead.
|
|
|
|
*/
|
|
|
|
if (len == PAGE_CACHE_SIZE)
|
|
|
|
goto out;
|
2007-03-05 17:31:00 -07:00
|
|
|
|
2008-11-26 12:32:33 -07:00
|
|
|
/*
|
|
|
|
* optimize away the read when we have an oplock, and we're not
|
|
|
|
* expecting to use any of the data we'd be reading in. That
|
|
|
|
* is, when the page lies beyond the EOF, or straddles the EOF
|
|
|
|
* and the write will cover all of the existing data.
|
|
|
|
*/
|
|
|
|
if (CIFS_I(mapping->host)->clientCanCacheRead) {
|
|
|
|
i_size = i_size_read(mapping->host);
|
|
|
|
if (page_start >= i_size ||
|
|
|
|
(offset == 0 && (pos + len) >= i_size)) {
|
|
|
|
zero_user_segments(page, 0, offset,
|
|
|
|
offset + len,
|
|
|
|
PAGE_CACHE_SIZE);
|
|
|
|
/*
|
|
|
|
* PageChecked means that the parts of the page
|
|
|
|
* to which we're not writing are considered up
|
|
|
|
* to date. Once the data is copied to the
|
|
|
|
* page, it can be set uptodate.
|
|
|
|
*/
|
|
|
|
SetPageChecked(page);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
2008-09-24 08:32:59 -07:00
|
|
|
|
2008-11-26 12:32:33 -07:00
|
|
|
if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
|
|
|
|
/*
|
|
|
|
* might as well read a page, it is fast enough. If we get
|
|
|
|
* an error, we don't need to return it. cifs_write_end will
|
|
|
|
* do a sync write instead since PG_uptodate isn't set.
|
|
|
|
*/
|
|
|
|
cifs_readpage_worker(file, page, &page_start);
|
2007-03-05 17:31:00 -07:00
|
|
|
} else {
|
|
|
|
/* we could try using another file handle if there is one -
|
|
|
|
but how would we lock it to prevent close of that handle
|
|
|
|
racing with this read? In any case
|
2008-09-24 08:32:59 -07:00
|
|
|
this will be written out by write_end so is fine */
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
2008-11-26 12:32:33 -07:00
|
|
|
out:
|
|
|
|
*pagep = page;
|
|
|
|
return rc;
|
2005-04-16 15:20:36 -07:00
|
|
|
}
|
|
|
|
|
2010-07-05 05:43:00 -07:00
|
|
|
static int cifs_release_page(struct page *page, gfp_t gfp)
|
|
|
|
{
|
|
|
|
if (PagePrivate(page))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return cifs_fscache_release_page(page, gfp);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void cifs_invalidate_page(struct page *page, unsigned long offset)
|
|
|
|
{
|
|
|
|
struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
|
|
|
|
|
|
|
|
if (offset == 0)
|
|
|
|
cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
|
|
|
|
}
|
|
|
|
|
2010-07-20 13:09:02 -07:00
|
|
|
void cifs_oplock_break(struct work_struct *work)
|
2009-09-21 03:47:50 -07:00
|
|
|
{
|
|
|
|
struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo,
|
|
|
|
oplock_break);
|
2010-10-11 12:07:18 -07:00
|
|
|
struct inode *inode = cfile->dentry->d_inode;
|
2009-09-21 03:47:50 -07:00
|
|
|
struct cifsInodeInfo *cinode = CIFS_I(inode);
|
2010-10-22 11:52:29 -07:00
|
|
|
int rc = 0;
|
2009-09-21 03:47:50 -07:00
|
|
|
|
|
|
|
if (inode && S_ISREG(inode->i_mode)) {
|
2010-04-26 21:38:15 -07:00
|
|
|
if (cinode->clientCanCacheRead)
|
2009-12-24 04:47:55 -07:00
|
|
|
break_lease(inode, O_RDONLY);
|
2010-04-26 21:38:15 -07:00
|
|
|
else
|
2009-12-24 04:47:55 -07:00
|
|
|
break_lease(inode, O_WRONLY);
|
2009-09-21 03:47:50 -07:00
|
|
|
rc = filemap_fdatawrite(inode->i_mapping);
|
|
|
|
if (cinode->clientCanCacheRead == 0) {
|
2010-10-22 11:52:29 -07:00
|
|
|
rc = filemap_fdatawait(inode->i_mapping);
|
|
|
|
mapping_set_error(inode->i_mapping, rc);
|
2009-09-21 03:47:50 -07:00
|
|
|
invalidate_remote_inode(inode);
|
|
|
|
}
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Oplock flush inode %p rc %d", inode, rc);
|
2009-09-21 03:47:50 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* releasing stale oplock after recent reconnect of smb session using
|
|
|
|
* a now incorrect file handle is not a data integrity issue but do
|
|
|
|
* not bother sending an oplock release if session to server still is
|
|
|
|
* disconnected since oplock already released by the server
|
|
|
|
*/
|
2010-10-21 15:46:14 -07:00
|
|
|
if (!cfile->oplock_break_cancelled) {
|
2010-09-29 16:51:11 -07:00
|
|
|
rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0,
|
|
|
|
0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false);
|
2010-04-20 20:50:45 -07:00
|
|
|
cFYI(1, "Oplock release rc = %d", rc);
|
2009-09-21 03:47:50 -07:00
|
|
|
}
|
2010-07-20 13:09:02 -07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* We might have kicked in before is_valid_oplock_break()
|
|
|
|
* finished grabbing reference for us. Make sure it's done by
|
2010-10-18 11:22:18 -07:00
|
|
|
* waiting for cifs_file_list_lock.
|
2010-07-20 13:09:02 -07:00
|
|
|
*/
|
2010-10-15 12:34:03 -07:00
|
|
|
spin_lock(&cifs_file_list_lock);
|
|
|
|
spin_unlock(&cifs_file_list_lock);
|
2010-07-20 13:09:02 -07:00
|
|
|
|
|
|
|
cifs_oplock_break_put(cfile);
|
2009-09-21 03:47:50 -07:00
|
|
|
}
|
|
|
|
|
2010-10-15 12:34:06 -07:00
|
|
|
/* must be called while holding cifs_file_list_lock */
|
2010-07-20 13:09:02 -07:00
|
|
|
void cifs_oplock_break_get(struct cifsFileInfo *cfile)
|
2009-09-21 03:47:50 -07:00
|
|
|
{
|
2010-10-11 12:07:19 -07:00
|
|
|
cifs_sb_active(cfile->dentry->d_sb);
|
2009-09-21 03:47:50 -07:00
|
|
|
cifsFileInfo_get(cfile);
|
|
|
|
}
|
|
|
|
|
2010-07-20 13:09:02 -07:00
|
|
|
void cifs_oplock_break_put(struct cifsFileInfo *cfile)
|
2009-09-21 03:47:50 -07:00
|
|
|
{
|
|
|
|
cifsFileInfo_put(cfile);
|
2010-10-11 12:07:19 -07:00
|
|
|
cifs_sb_deactive(cfile->dentry->d_sb);
|
2009-09-21 03:47:50 -07:00
|
|
|
}
|
|
|
|
|
2006-06-28 04:26:44 -07:00
|
|
|
const struct address_space_operations cifs_addr_ops = {
|
2005-04-16 15:20:36 -07:00
|
|
|
.readpage = cifs_readpage,
|
|
|
|
.readpages = cifs_readpages,
|
|
|
|
.writepage = cifs_writepage,
|
2005-10-05 14:50:29 -07:00
|
|
|
.writepages = cifs_writepages,
|
2008-09-24 08:32:59 -07:00
|
|
|
.write_begin = cifs_write_begin,
|
|
|
|
.write_end = cifs_write_end,
|
2005-04-16 15:20:36 -07:00
|
|
|
.set_page_dirty = __set_page_dirty_nobuffers,
|
2010-07-05 05:43:00 -07:00
|
|
|
.releasepage = cifs_release_page,
|
|
|
|
.invalidatepage = cifs_invalidate_page,
|
2005-04-16 15:20:36 -07:00
|
|
|
/* .sync_page = cifs_sync_page, */
|
|
|
|
/* .direct_IO = */
|
|
|
|
};
|
2006-06-01 12:41:23 -07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* cifs_readpages requires the server to support a buffer large enough to
|
|
|
|
* contain the header plus one complete page of data. Otherwise, we need
|
|
|
|
* to leave cifs_readpages out of the address space operations.
|
|
|
|
*/
|
2006-06-28 04:26:44 -07:00
|
|
|
const struct address_space_operations cifs_addr_ops_smallbuf = {
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2006-06-01 12:41:23 -07:00
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.readpage = cifs_readpage,
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.writepage = cifs_writepage,
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.writepages = cifs_writepages,
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2008-09-24 08:32:59 -07:00
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.write_begin = cifs_write_begin,
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.write_end = cifs_write_end,
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2006-06-01 12:41:23 -07:00
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.set_page_dirty = __set_page_dirty_nobuffers,
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2010-07-05 05:43:00 -07:00
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.releasepage = cifs_release_page,
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.invalidatepage = cifs_invalidate_page,
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2006-06-01 12:41:23 -07:00
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/* .sync_page = cifs_sync_page, */
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/* .direct_IO = */
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};
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