mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
1949 lines
52 KiB
C
1949 lines
52 KiB
C
/*
|
|
* fs/cifs/file.c
|
|
*
|
|
* vfs operations that deal with files
|
|
*
|
|
* Copyright (C) International Business Machines Corp., 2002,2003
|
|
* Author(s): Steve French (sfrench@us.ibm.com)
|
|
*
|
|
* This library is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published
|
|
* by the Free Software Foundation; either version 2.1 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
|
* the GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/mpage.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/pagevec.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/writeback.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/div64.h>
|
|
#include "cifsfs.h"
|
|
#include "cifspdu.h"
|
|
#include "cifsglob.h"
|
|
#include "cifsproto.h"
|
|
#include "cifs_unicode.h"
|
|
#include "cifs_debug.h"
|
|
#include "cifs_fs_sb.h"
|
|
|
|
static inline struct cifsFileInfo *cifs_init_private(
|
|
struct cifsFileInfo *private_data, struct inode *inode,
|
|
struct file *file, __u16 netfid)
|
|
{
|
|
memset(private_data, 0, sizeof(struct cifsFileInfo));
|
|
private_data->netfid = netfid;
|
|
private_data->pid = current->tgid;
|
|
init_MUTEX(&private_data->fh_sem);
|
|
private_data->pfile = file; /* needed for writepage */
|
|
private_data->pInode = inode;
|
|
private_data->invalidHandle = FALSE;
|
|
private_data->closePend = FALSE;
|
|
/* we have to track num writers to the inode, since writepages
|
|
does not tell us which handle the write is for so there can
|
|
be a close (overlapping with write) of the filehandle that
|
|
cifs_writepages chose to use */
|
|
atomic_set(&private_data->wrtPending,0);
|
|
|
|
return private_data;
|
|
}
|
|
|
|
static inline int cifs_convert_flags(unsigned int flags)
|
|
{
|
|
if ((flags & O_ACCMODE) == O_RDONLY)
|
|
return GENERIC_READ;
|
|
else if ((flags & O_ACCMODE) == O_WRONLY)
|
|
return GENERIC_WRITE;
|
|
else if ((flags & O_ACCMODE) == O_RDWR) {
|
|
/* GENERIC_ALL is too much permission to request
|
|
can cause unnecessary access denied on create */
|
|
/* return GENERIC_ALL; */
|
|
return (GENERIC_READ | GENERIC_WRITE);
|
|
}
|
|
|
|
return 0x20197;
|
|
}
|
|
|
|
static inline int cifs_get_disposition(unsigned int flags)
|
|
{
|
|
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
|
|
return FILE_CREATE;
|
|
else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
|
|
return FILE_OVERWRITE_IF;
|
|
else if ((flags & O_CREAT) == O_CREAT)
|
|
return FILE_OPEN_IF;
|
|
else
|
|
return FILE_OPEN;
|
|
}
|
|
|
|
/* all arguments to this function must be checked for validity in caller */
|
|
static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
|
|
struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile,
|
|
struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf,
|
|
char *full_path, int xid)
|
|
{
|
|
struct timespec temp;
|
|
int rc;
|
|
|
|
/* want handles we can use to read with first
|
|
in the list so we do not have to walk the
|
|
list to search for one in prepare_write */
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
|
|
list_add_tail(&pCifsFile->flist,
|
|
&pCifsInode->openFileList);
|
|
} else {
|
|
list_add(&pCifsFile->flist,
|
|
&pCifsInode->openFileList);
|
|
}
|
|
write_unlock(&GlobalSMBSeslock);
|
|
write_unlock(&file->f_owner.lock);
|
|
if (pCifsInode->clientCanCacheRead) {
|
|
/* we have the inode open somewhere else
|
|
no need to discard cache data */
|
|
goto client_can_cache;
|
|
}
|
|
|
|
/* BB need same check in cifs_create too? */
|
|
/* if not oplocked, invalidate inode pages if mtime or file
|
|
size changed */
|
|
temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime));
|
|
if (timespec_equal(&file->f_dentry->d_inode->i_mtime, &temp) &&
|
|
(file->f_dentry->d_inode->i_size ==
|
|
(loff_t)le64_to_cpu(buf->EndOfFile))) {
|
|
cFYI(1, ("inode unchanged on server"));
|
|
} else {
|
|
if (file->f_dentry->d_inode->i_mapping) {
|
|
/* BB no need to lock inode until after invalidate
|
|
since namei code should already have it locked? */
|
|
filemap_write_and_wait(file->f_dentry->d_inode->i_mapping);
|
|
}
|
|
cFYI(1, ("invalidating remote inode since open detected it "
|
|
"changed"));
|
|
invalidate_remote_inode(file->f_dentry->d_inode);
|
|
}
|
|
|
|
client_can_cache:
|
|
if (pTcon->ses->capabilities & CAP_UNIX)
|
|
rc = cifs_get_inode_info_unix(&file->f_dentry->d_inode,
|
|
full_path, inode->i_sb, xid);
|
|
else
|
|
rc = cifs_get_inode_info(&file->f_dentry->d_inode,
|
|
full_path, buf, inode->i_sb, xid);
|
|
|
|
if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) {
|
|
pCifsInode->clientCanCacheAll = TRUE;
|
|
pCifsInode->clientCanCacheRead = TRUE;
|
|
cFYI(1, ("Exclusive Oplock granted on inode %p",
|
|
file->f_dentry->d_inode));
|
|
} else if ((*oplock & 0xF) == OPLOCK_READ)
|
|
pCifsInode->clientCanCacheRead = TRUE;
|
|
|
|
return rc;
|
|
}
|
|
|
|
int cifs_open(struct inode *inode, struct file *file)
|
|
{
|
|
int rc = -EACCES;
|
|
int xid, oplock;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifsTconInfo *pTcon;
|
|
struct cifsFileInfo *pCifsFile;
|
|
struct cifsInodeInfo *pCifsInode;
|
|
struct list_head *tmp;
|
|
char *full_path = NULL;
|
|
int desiredAccess;
|
|
int disposition;
|
|
__u16 netfid;
|
|
FILE_ALL_INFO *buf = NULL;
|
|
|
|
xid = GetXid();
|
|
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
if (file->f_flags & O_CREAT) {
|
|
/* search inode for this file and fill in file->private_data */
|
|
pCifsInode = CIFS_I(file->f_dentry->d_inode);
|
|
read_lock(&GlobalSMBSeslock);
|
|
list_for_each(tmp, &pCifsInode->openFileList) {
|
|
pCifsFile = list_entry(tmp, struct cifsFileInfo,
|
|
flist);
|
|
if ((pCifsFile->pfile == NULL) &&
|
|
(pCifsFile->pid == current->tgid)) {
|
|
/* mode set in cifs_create */
|
|
|
|
/* needed for writepage */
|
|
pCifsFile->pfile = file;
|
|
|
|
file->private_data = pCifsFile;
|
|
break;
|
|
}
|
|
}
|
|
read_unlock(&GlobalSMBSeslock);
|
|
if (file->private_data != NULL) {
|
|
rc = 0;
|
|
FreeXid(xid);
|
|
return rc;
|
|
} else {
|
|
if (file->f_flags & O_EXCL)
|
|
cERROR(1, ("could not find file instance for "
|
|
"new file %p ", file));
|
|
}
|
|
}
|
|
|
|
down(&inode->i_sb->s_vfs_rename_sem);
|
|
full_path = build_path_from_dentry(file->f_dentry);
|
|
up(&inode->i_sb->s_vfs_rename_sem);
|
|
if (full_path == NULL) {
|
|
FreeXid(xid);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cFYI(1, (" inode = 0x%p file flags are 0x%x for %s",
|
|
inode, file->f_flags, full_path));
|
|
desiredAccess = cifs_convert_flags(file->f_flags);
|
|
|
|
/*********************************************************************
|
|
* open flag mapping table:
|
|
*
|
|
* POSIX Flag CIFS Disposition
|
|
* ---------- ----------------
|
|
* 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
|
|
* FILE_SUPERSEDE (ie create whether or not file exists although
|
|
* 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)
|
|
*?
|
|
*? O_SYNC is a reasonable match to CIFS writethrough flag
|
|
*? 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);
|
|
|
|
if (oplockEnabled)
|
|
oplock = REQ_OPLOCK;
|
|
else
|
|
oplock = FALSE;
|
|
|
|
/* 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) */
|
|
|
|
/* 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
|
|
able to simply do a filemap_fdatawrite/filemap_fdatawait first */
|
|
buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
|
|
if (!buf) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess,
|
|
CREATE_NOT_DIR, &netfid, &oplock, buf,
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
|
|
& CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
if (rc == -EIO) {
|
|
/* Old server, try legacy style OpenX */
|
|
rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
|
|
desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
|
|
& CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
}
|
|
if (rc) {
|
|
cFYI(1, ("cifs_open returned 0x%x ", rc));
|
|
goto out;
|
|
}
|
|
file->private_data =
|
|
kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
|
|
if (file->private_data == NULL) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
pCifsFile = cifs_init_private(file->private_data, inode, file, netfid);
|
|
write_lock(&file->f_owner.lock);
|
|
write_lock(&GlobalSMBSeslock);
|
|
list_add(&pCifsFile->tlist, &pTcon->openFileList);
|
|
|
|
pCifsInode = CIFS_I(file->f_dentry->d_inode);
|
|
if (pCifsInode) {
|
|
rc = cifs_open_inode_helper(inode, file, pCifsInode,
|
|
pCifsFile, pTcon,
|
|
&oplock, buf, full_path, xid);
|
|
} else {
|
|
write_unlock(&GlobalSMBSeslock);
|
|
write_unlock(&file->f_owner.lock);
|
|
}
|
|
|
|
if (oplock & CIFS_CREATE_ACTION) {
|
|
/* time to set mode which we can not set earlier due to
|
|
problems creating new read-only files */
|
|
if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
|
|
CIFSSMBUnixSetPerms(xid, pTcon, full_path,
|
|
inode->i_mode,
|
|
(__u64)-1, (__u64)-1, 0 /* dev */,
|
|
cifs_sb->local_nls,
|
|
cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
} else {
|
|
/* BB implement via Windows security descriptors eg
|
|
CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
|
|
-1, -1, local_nls);
|
|
in the meantime could set r/o dos attribute when
|
|
perms are eg: mode & 0222 == 0 */
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(buf);
|
|
kfree(full_path);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/* Try to reaquire byte range locks that were released when session */
|
|
/* 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;
|
|
}
|
|
|
|
static int cifs_reopen_file(struct inode *inode, struct file *file,
|
|
int can_flush)
|
|
{
|
|
int rc = -EACCES;
|
|
int xid, oplock;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifsTconInfo *pTcon;
|
|
struct cifsFileInfo *pCifsFile;
|
|
struct cifsInodeInfo *pCifsInode;
|
|
char *full_path = NULL;
|
|
int desiredAccess;
|
|
int disposition = FILE_OPEN;
|
|
__u16 netfid;
|
|
|
|
if (inode == NULL)
|
|
return -EBADF;
|
|
if (file->private_data) {
|
|
pCifsFile = (struct cifsFileInfo *)file->private_data;
|
|
} else
|
|
return -EBADF;
|
|
|
|
xid = GetXid();
|
|
down(&pCifsFile->fh_sem);
|
|
if (pCifsFile->invalidHandle == FALSE) {
|
|
up(&pCifsFile->fh_sem);
|
|
FreeXid(xid);
|
|
return 0;
|
|
}
|
|
|
|
if (file->f_dentry == NULL) {
|
|
up(&pCifsFile->fh_sem);
|
|
cFYI(1, ("failed file reopen, no valid name if dentry freed"));
|
|
FreeXid(xid);
|
|
return -EBADF;
|
|
}
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
/* 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 */
|
|
full_path = build_path_from_dentry(file->f_dentry);
|
|
if (full_path == NULL) {
|
|
up(&pCifsFile->fh_sem);
|
|
FreeXid(xid);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cFYI(1, (" inode = 0x%p file flags are 0x%x for %s",
|
|
inode, file->f_flags,full_path));
|
|
desiredAccess = cifs_convert_flags(file->f_flags);
|
|
|
|
if (oplockEnabled)
|
|
oplock = REQ_OPLOCK;
|
|
else
|
|
oplock = FALSE;
|
|
|
|
/* Can not refresh inode by passing in file_info buf to be returned
|
|
by SMBOpen and then calling get_inode_info with returned buf
|
|
since file might have write behind data that needs to be flushed
|
|
and server version of file size can be stale. If we knew for sure
|
|
that inode was not dirty locally we could do this */
|
|
|
|
/* buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
|
|
if (buf == 0) {
|
|
up(&pCifsFile->fh_sem);
|
|
kfree(full_path);
|
|
FreeXid(xid);
|
|
return -ENOMEM;
|
|
} */
|
|
rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess,
|
|
CREATE_NOT_DIR, &netfid, &oplock, NULL,
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
if (rc) {
|
|
up(&pCifsFile->fh_sem);
|
|
cFYI(1, ("cifs_open returned 0x%x ", rc));
|
|
cFYI(1, ("oplock: %d ", oplock));
|
|
} else {
|
|
pCifsFile->netfid = netfid;
|
|
pCifsFile->invalidHandle = FALSE;
|
|
up(&pCifsFile->fh_sem);
|
|
pCifsInode = CIFS_I(inode);
|
|
if (pCifsInode) {
|
|
if (can_flush) {
|
|
filemap_write_and_wait(inode->i_mapping);
|
|
/* temporarily disable caching while we
|
|
go to server to get inode info */
|
|
pCifsInode->clientCanCacheAll = FALSE;
|
|
pCifsInode->clientCanCacheRead = FALSE;
|
|
if (pTcon->ses->capabilities & CAP_UNIX)
|
|
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);
|
|
} /* 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",
|
|
file->f_dentry->d_inode));
|
|
} else if ((oplock & 0xF) == OPLOCK_READ) {
|
|
pCifsInode->clientCanCacheRead = TRUE;
|
|
pCifsInode->clientCanCacheAll = FALSE;
|
|
} else {
|
|
pCifsInode->clientCanCacheRead = FALSE;
|
|
pCifsInode->clientCanCacheAll = FALSE;
|
|
}
|
|
cifs_relock_file(pCifsFile);
|
|
}
|
|
}
|
|
|
|
kfree(full_path);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_close(struct inode *inode, struct file *file)
|
|
{
|
|
int rc = 0;
|
|
int xid;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifsTconInfo *pTcon;
|
|
struct cifsFileInfo *pSMBFile =
|
|
(struct cifsFileInfo *)file->private_data;
|
|
|
|
xid = GetXid();
|
|
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
if (pSMBFile) {
|
|
pSMBFile->closePend = TRUE;
|
|
write_lock(&file->f_owner.lock);
|
|
if (pTcon) {
|
|
/* no sense reconnecting to close a file that is
|
|
already closed */
|
|
if (pTcon->tidStatus != CifsNeedReconnect) {
|
|
int timeout = 2;
|
|
while((atomic_read(&pSMBFile->wrtPending) != 0)
|
|
&& (timeout < 1000) ) {
|
|
/* Give write a better chance to get to
|
|
server ahead of the close. We do not
|
|
want to add a wait_q here as it would
|
|
increase the memory utilization as
|
|
the struct would be in each open file,
|
|
but this should give enough time to
|
|
clear the socket */
|
|
write_unlock(&file->f_owner.lock);
|
|
cERROR(1,("close with pending writes"));
|
|
msleep(timeout);
|
|
write_lock(&file->f_owner.lock);
|
|
timeout *= 4;
|
|
}
|
|
write_unlock(&file->f_owner.lock);
|
|
rc = CIFSSMBClose(xid, pTcon,
|
|
pSMBFile->netfid);
|
|
write_lock(&file->f_owner.lock);
|
|
}
|
|
}
|
|
write_lock(&GlobalSMBSeslock);
|
|
list_del(&pSMBFile->flist);
|
|
list_del(&pSMBFile->tlist);
|
|
write_unlock(&GlobalSMBSeslock);
|
|
write_unlock(&file->f_owner.lock);
|
|
kfree(pSMBFile->search_resume_name);
|
|
kfree(file->private_data);
|
|
file->private_data = NULL;
|
|
} else
|
|
rc = -EBADF;
|
|
|
|
if (list_empty(&(CIFS_I(inode)->openFileList))) {
|
|
cFYI(1, ("closing last open instance for inode %p", inode));
|
|
/* if the file is not open we do not know if we can cache info
|
|
on this inode, much less write behind and read ahead */
|
|
CIFS_I(inode)->clientCanCacheRead = FALSE;
|
|
CIFS_I(inode)->clientCanCacheAll = FALSE;
|
|
}
|
|
if ((rc ==0) && CIFS_I(inode)->write_behind_rc)
|
|
rc = CIFS_I(inode)->write_behind_rc;
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_closedir(struct inode *inode, struct file *file)
|
|
{
|
|
int rc = 0;
|
|
int xid;
|
|
struct cifsFileInfo *pCFileStruct =
|
|
(struct cifsFileInfo *)file->private_data;
|
|
char *ptmp;
|
|
|
|
cFYI(1, ("Closedir inode = 0x%p with ", inode));
|
|
|
|
xid = GetXid();
|
|
|
|
if (pCFileStruct) {
|
|
struct cifsTconInfo *pTcon;
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_dentry->d_sb);
|
|
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
cFYI(1, ("Freeing private data in close dir"));
|
|
if ((pCFileStruct->srch_inf.endOfSearch == FALSE) &&
|
|
(pCFileStruct->invalidHandle == FALSE)) {
|
|
pCFileStruct->invalidHandle = TRUE;
|
|
rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
|
|
cFYI(1, ("Closing uncompleted readdir with rc %d",
|
|
rc));
|
|
/* not much we can do if it fails anyway, ignore rc */
|
|
rc = 0;
|
|
}
|
|
ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
|
|
if (ptmp) {
|
|
cFYI(1, ("closedir free smb buf in srch struct"));
|
|
pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
|
|
if(pCFileStruct->srch_inf.smallBuf)
|
|
cifs_small_buf_release(ptmp);
|
|
else
|
|
cifs_buf_release(ptmp);
|
|
}
|
|
ptmp = pCFileStruct->search_resume_name;
|
|
if (ptmp) {
|
|
cFYI(1, ("closedir free resume name"));
|
|
pCFileStruct->search_resume_name = NULL;
|
|
kfree(ptmp);
|
|
}
|
|
kfree(file->private_data);
|
|
file->private_data = NULL;
|
|
}
|
|
/* BB can we lock the filestruct while this is going on? */
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
|
|
{
|
|
int rc, xid;
|
|
__u32 numLock = 0;
|
|
__u32 numUnlock = 0;
|
|
__u64 length;
|
|
int wait_flag = FALSE;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct cifsTconInfo *pTcon;
|
|
__u16 netfid;
|
|
__u8 lockType = LOCKING_ANDX_LARGE_FILES;
|
|
|
|
length = 1 + pfLock->fl_end - pfLock->fl_start;
|
|
rc = -EACCES;
|
|
xid = GetXid();
|
|
|
|
cFYI(1, ("Lock parm: 0x%x flockflags: "
|
|
"0x%x flocktype: 0x%x start: %lld end: %lld",
|
|
cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
|
|
pfLock->fl_end));
|
|
|
|
if (pfLock->fl_flags & FL_POSIX)
|
|
cFYI(1, ("Posix"));
|
|
if (pfLock->fl_flags & FL_FLOCK)
|
|
cFYI(1, ("Flock"));
|
|
if (pfLock->fl_flags & FL_SLEEP) {
|
|
cFYI(1, ("Blocking lock"));
|
|
wait_flag = TRUE;
|
|
}
|
|
if (pfLock->fl_flags & FL_ACCESS)
|
|
cFYI(1, ("Process suspended by mandatory locking - "
|
|
"not implemented yet "));
|
|
if (pfLock->fl_flags & FL_LEASE)
|
|
cFYI(1, ("Lease on file - not implemented yet"));
|
|
if (pfLock->fl_flags &
|
|
(~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
|
|
cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags));
|
|
|
|
if (pfLock->fl_type == F_WRLCK) {
|
|
cFYI(1, ("F_WRLCK "));
|
|
numLock = 1;
|
|
} else if (pfLock->fl_type == F_UNLCK) {
|
|
cFYI(1, ("F_UNLCK"));
|
|
numUnlock = 1;
|
|
/* Check if unlock includes more than
|
|
one lock range */
|
|
} else if (pfLock->fl_type == F_RDLCK) {
|
|
cFYI(1, ("F_RDLCK"));
|
|
lockType |= LOCKING_ANDX_SHARED_LOCK;
|
|
numLock = 1;
|
|
} else if (pfLock->fl_type == F_EXLCK) {
|
|
cFYI(1, ("F_EXLCK"));
|
|
numLock = 1;
|
|
} else if (pfLock->fl_type == F_SHLCK) {
|
|
cFYI(1, ("F_SHLCK"));
|
|
lockType |= LOCKING_ANDX_SHARED_LOCK;
|
|
numLock = 1;
|
|
} else
|
|
cFYI(1, ("Unknown type of lock"));
|
|
|
|
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
if (file->private_data == NULL) {
|
|
FreeXid(xid);
|
|
return -EBADF;
|
|
}
|
|
netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
|
|
|
|
|
|
/* BB add code here to normalize offset and length to
|
|
account for negative length which we can not accept over the
|
|
wire */
|
|
if (IS_GETLK(cmd)) {
|
|
if(experimEnabled &&
|
|
(cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
|
|
(CIFS_UNIX_FCNTL_CAP &
|
|
le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) {
|
|
int posix_lock_type;
|
|
if(lockType & LOCKING_ANDX_SHARED_LOCK)
|
|
posix_lock_type = CIFS_RDLCK;
|
|
else
|
|
posix_lock_type = CIFS_WRLCK;
|
|
rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */,
|
|
length, pfLock->fl_start,
|
|
posix_lock_type, wait_flag);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/* BB we could chain these into one lock request BB */
|
|
rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
|
|
0, 1, lockType, 0 /* wait flag */ );
|
|
if (rc == 0) {
|
|
rc = CIFSSMBLock(xid, pTcon, netfid, length,
|
|
pfLock->fl_start, 1 /* numUnlock */ ,
|
|
0 /* numLock */ , lockType,
|
|
0 /* wait flag */ );
|
|
pfLock->fl_type = F_UNLCK;
|
|
if (rc != 0)
|
|
cERROR(1, ("Error unlocking previously locked "
|
|
"range %d during test of lock", rc));
|
|
rc = 0;
|
|
|
|
} else {
|
|
/* if rc == ERR_SHARING_VIOLATION ? */
|
|
rc = 0; /* do not change lock type to unlock
|
|
since range in use */
|
|
}
|
|
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
if (experimEnabled &&
|
|
(cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
|
|
(CIFS_UNIX_FCNTL_CAP &
|
|
le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability))) {
|
|
int posix_lock_type;
|
|
if(lockType & LOCKING_ANDX_SHARED_LOCK)
|
|
posix_lock_type = CIFS_RDLCK;
|
|
else
|
|
posix_lock_type = CIFS_WRLCK;
|
|
|
|
if(numUnlock == 1)
|
|
posix_lock_type |= CIFS_UNLCK;
|
|
else if(numLock == 0) {
|
|
/* if no lock or unlock then nothing
|
|
to do since we do not know what it is */
|
|
FreeXid(xid);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */,
|
|
length, pfLock->fl_start,
|
|
posix_lock_type, wait_flag);
|
|
} else
|
|
rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
|
|
numUnlock, numLock, lockType, wait_flag);
|
|
if (pfLock->fl_flags & FL_POSIX)
|
|
posix_lock_file_wait(file, pfLock);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
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;
|
|
|
|
if (file->f_dentry == NULL)
|
|
return -EBADF;
|
|
|
|
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
|
|
if (cifs_sb == NULL)
|
|
return -EBADF;
|
|
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
/* cFYI(1,
|
|
(" write %d bytes to offset %lld of %s", write_size,
|
|
*poffset, file->f_dentry->d_name.name)); */
|
|
|
|
if (file->private_data == NULL)
|
|
return -EBADF;
|
|
else
|
|
open_file = (struct cifsFileInfo *) file->private_data;
|
|
|
|
xid = GetXid();
|
|
if (file->f_dentry->d_inode == NULL) {
|
|
FreeXid(xid);
|
|
return -EBADF;
|
|
}
|
|
|
|
if (*poffset > file->f_dentry->d_inode->i_size)
|
|
long_op = 2; /* writes past end of file can take a long time */
|
|
else
|
|
long_op = 1;
|
|
|
|
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;
|
|
}
|
|
if (open_file->closePend) {
|
|
FreeXid(xid);
|
|
if (total_written)
|
|
return total_written;
|
|
else
|
|
return -EBADF;
|
|
}
|
|
if (open_file->invalidHandle) {
|
|
if ((file->f_dentry == NULL) ||
|
|
(file->f_dentry->d_inode == NULL)) {
|
|
FreeXid(xid);
|
|
return total_written;
|
|
}
|
|
/* we could deadlock if we called
|
|
filemap_fdatawait from here so tell
|
|
reopen_file not to flush data to server
|
|
now */
|
|
rc = cifs_reopen_file(file->f_dentry->d_inode,
|
|
file, FALSE);
|
|
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;
|
|
}
|
|
} else
|
|
*poffset += bytes_written;
|
|
long_op = FALSE; /* subsequent writes fast -
|
|
15 seconds is plenty */
|
|
}
|
|
|
|
cifs_stats_bytes_written(pTcon, total_written);
|
|
|
|
/* since the write may have blocked check these pointers again */
|
|
if (file->f_dentry) {
|
|
if (file->f_dentry->d_inode) {
|
|
struct inode *inode = file->f_dentry->d_inode;
|
|
inode->i_ctime = inode->i_mtime =
|
|
current_fs_time(inode->i_sb);
|
|
if (total_written > 0) {
|
|
if (*poffset > file->f_dentry->d_inode->i_size)
|
|
i_size_write(file->f_dentry->d_inode,
|
|
*poffset);
|
|
}
|
|
mark_inode_dirty_sync(file->f_dentry->d_inode);
|
|
}
|
|
}
|
|
FreeXid(xid);
|
|
return total_written;
|
|
}
|
|
|
|
static ssize_t cifs_write(struct file *file, const char *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;
|
|
|
|
if (file->f_dentry == NULL)
|
|
return -EBADF;
|
|
|
|
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
|
|
if (cifs_sb == NULL)
|
|
return -EBADF;
|
|
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
cFYI(1,("write %zd bytes to offset %lld of %s", write_size,
|
|
*poffset, file->f_dentry->d_name.name));
|
|
|
|
if (file->private_data == NULL)
|
|
return -EBADF;
|
|
else
|
|
open_file = (struct cifsFileInfo *)file->private_data;
|
|
|
|
xid = GetXid();
|
|
if (file->f_dentry->d_inode == NULL) {
|
|
FreeXid(xid);
|
|
return -EBADF;
|
|
}
|
|
|
|
if (*poffset > file->f_dentry->d_inode->i_size)
|
|
long_op = 2; /* writes past end of file can take a long time */
|
|
else
|
|
long_op = 1;
|
|
|
|
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;
|
|
}
|
|
if (open_file->closePend) {
|
|
FreeXid(xid);
|
|
if (total_written)
|
|
return total_written;
|
|
else
|
|
return -EBADF;
|
|
}
|
|
if (open_file->invalidHandle) {
|
|
if ((file->f_dentry == NULL) ||
|
|
(file->f_dentry->d_inode == NULL)) {
|
|
FreeXid(xid);
|
|
return total_written;
|
|
}
|
|
/* we could deadlock if we called
|
|
filemap_fdatawait from here so tell
|
|
reopen_file not to flush data to
|
|
server now */
|
|
rc = cifs_reopen_file(file->f_dentry->d_inode,
|
|
file, FALSE);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
/* BB FIXME We can not sign across two buffers yet */
|
|
if((pTcon->ses->server->secMode &
|
|
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) == 0) {
|
|
struct kvec iov[2];
|
|
unsigned int len;
|
|
|
|
len = min((size_t)cifs_sb->wsize,
|
|
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;
|
|
rc = CIFSSMBWrite2(xid, pTcon,
|
|
open_file->netfid, len,
|
|
*poffset, &bytes_written,
|
|
iov, 1, long_op);
|
|
} else
|
|
/* BB FIXME fixup indentation of line below */
|
|
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);
|
|
}
|
|
if (rc || (bytes_written == 0)) {
|
|
if (total_written)
|
|
break;
|
|
else {
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
} else
|
|
*poffset += bytes_written;
|
|
long_op = FALSE; /* subsequent writes fast -
|
|
15 seconds is plenty */
|
|
}
|
|
|
|
cifs_stats_bytes_written(pTcon, total_written);
|
|
|
|
/* since the write may have blocked check these pointers again */
|
|
if (file->f_dentry) {
|
|
if (file->f_dentry->d_inode) {
|
|
file->f_dentry->d_inode->i_ctime =
|
|
file->f_dentry->d_inode->i_mtime = CURRENT_TIME;
|
|
if (total_written > 0) {
|
|
if (*poffset > file->f_dentry->d_inode->i_size)
|
|
i_size_write(file->f_dentry->d_inode,
|
|
*poffset);
|
|
}
|
|
mark_inode_dirty_sync(file->f_dentry->d_inode);
|
|
}
|
|
}
|
|
FreeXid(xid);
|
|
return total_written;
|
|
}
|
|
|
|
struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
|
|
{
|
|
struct cifsFileInfo *open_file;
|
|
int rc;
|
|
|
|
read_lock(&GlobalSMBSeslock);
|
|
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
|
|
if (open_file->closePend)
|
|
continue;
|
|
if (open_file->pfile &&
|
|
((open_file->pfile->f_flags & O_RDWR) ||
|
|
(open_file->pfile->f_flags & O_WRONLY))) {
|
|
atomic_inc(&open_file->wrtPending);
|
|
read_unlock(&GlobalSMBSeslock);
|
|
if((open_file->invalidHandle) &&
|
|
(!open_file->closePend) /* BB fixme -since the second clause can not be true remove it BB */) {
|
|
rc = cifs_reopen_file(&cifs_inode->vfs_inode,
|
|
open_file->pfile, FALSE);
|
|
/* if it fails, try another handle - might be */
|
|
/* dangerous to hold up writepages with retry */
|
|
if(rc) {
|
|
cFYI(1,("failed on reopen file in wp"));
|
|
read_lock(&GlobalSMBSeslock);
|
|
/* can not use this handle, no write
|
|
pending on this one after all */
|
|
atomic_dec
|
|
(&open_file->wrtPending);
|
|
continue;
|
|
}
|
|
}
|
|
return open_file;
|
|
}
|
|
}
|
|
read_unlock(&GlobalSMBSeslock);
|
|
return NULL;
|
|
}
|
|
|
|
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 cifsTconInfo *pTcon;
|
|
struct inode *inode;
|
|
struct cifsFileInfo *open_file;
|
|
|
|
if (!mapping || !mapping->host)
|
|
return -EFAULT;
|
|
|
|
inode = page->mapping->host;
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
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)
|
|
to = (unsigned)(mapping->host->i_size - offset);
|
|
|
|
open_file = find_writable_file(CIFS_I(mapping->host));
|
|
if (open_file) {
|
|
bytes_written = cifs_write(open_file->pfile, write_data,
|
|
to-from, &offset);
|
|
atomic_dec(&open_file->wrtPending);
|
|
/* Does mm or vfs already set times? */
|
|
inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
|
|
if ((bytes_written > 0) && (offset)) {
|
|
rc = 0;
|
|
} else if (bytes_written < 0) {
|
|
if (rc != -EBADF)
|
|
rc = bytes_written;
|
|
}
|
|
} else {
|
|
cFYI(1, ("No writeable filehandles for inode"));
|
|
rc = -EIO;
|
|
}
|
|
|
|
kunmap(page);
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
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;
|
|
pgoff_t end = -1;
|
|
pgoff_t index;
|
|
int is_range = 0;
|
|
struct kvec iov[32];
|
|
int len;
|
|
int n_iov = 0;
|
|
pgoff_t next;
|
|
int nr_pages;
|
|
__u64 offset = 0;
|
|
struct cifsFileInfo *open_file;
|
|
struct page *page;
|
|
struct pagevec pvec;
|
|
int rc = 0;
|
|
int scanned = 0;
|
|
int xid;
|
|
|
|
cifs_sb = CIFS_SB(mapping->host->i_sb);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/* BB FIXME we do not have code to sign across multiple buffers yet,
|
|
so go to older writepage style write which we can sign if needed */
|
|
if((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server))
|
|
if(cifs_sb->tcon->ses->server->secMode &
|
|
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
|
|
return generic_writepages(mapping, wbc);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
xid = GetXid();
|
|
|
|
pagevec_init(&pvec, 0);
|
|
if (wbc->sync_mode == WB_SYNC_NONE)
|
|
index = mapping->writeback_index; /* Start from prev offset */
|
|
else {
|
|
index = 0;
|
|
scanned = 1;
|
|
}
|
|
if (wbc->start || wbc->end) {
|
|
index = wbc->start >> PAGE_CACHE_SHIFT;
|
|
end = wbc->end >> PAGE_CACHE_SHIFT;
|
|
is_range = 1;
|
|
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);
|
|
else if (TestSetPageLocked(page))
|
|
break;
|
|
|
|
if (unlikely(page->mapping != mapping)) {
|
|
unlock_page(page);
|
|
break;
|
|
}
|
|
|
|
if (unlikely(is_range) && (page->index > end)) {
|
|
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) ||
|
|
!test_clear_page_dirty(page)) {
|
|
unlock_page(page);
|
|
break;
|
|
}
|
|
|
|
if (page_offset(page) >= mapping->host->i_size) {
|
|
done = 1;
|
|
unlock_page(page);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* BB can we get rid of this? pages are held by pvec
|
|
*/
|
|
page_cache_get(page);
|
|
|
|
len = min(mapping->host->i_size - page_offset(page),
|
|
(loff_t)PAGE_CACHE_SIZE);
|
|
|
|
/* reserve iov[0] for the smb header */
|
|
n_iov++;
|
|
iov[n_iov].iov_base = kmap(page);
|
|
iov[n_iov].iov_len = len;
|
|
bytes_to_write += len;
|
|
|
|
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) {
|
|
/* Search for a writable handle every time we call
|
|
* CIFSSMBWrite2. We can't rely on the last handle
|
|
* we used to still be valid
|
|
*/
|
|
open_file = find_writable_file(CIFS_I(mapping->host));
|
|
if (!open_file) {
|
|
cERROR(1, ("No writable handles for inode"));
|
|
rc = -EBADF;
|
|
} else {
|
|
rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
|
|
open_file->netfid,
|
|
bytes_to_write, offset,
|
|
&bytes_written, iov, n_iov,
|
|
1);
|
|
atomic_dec(&open_file->wrtPending);
|
|
if (rc || bytes_written < bytes_to_write) {
|
|
cERROR(1,("Write2 ret %d, written = %d",
|
|
rc, bytes_written));
|
|
/* BB what if continued retry is
|
|
requested via mount flags? */
|
|
set_bit(AS_EIO, &mapping->flags);
|
|
} else {
|
|
cifs_stats_bytes_written(cifs_sb->tcon,
|
|
bytes_written);
|
|
}
|
|
}
|
|
for (i = 0; i < n_iov; i++) {
|
|
page = pvec.pages[first + i];
|
|
/* 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
|
|
when page marked as error */
|
|
if(rc)
|
|
SetPageError(page);
|
|
kunmap(page);
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
}
|
|
if ((wbc->nr_to_write -= n_iov) <= 0)
|
|
done = 1;
|
|
index = next;
|
|
}
|
|
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;
|
|
}
|
|
if (!is_range)
|
|
mapping->writeback_index = index;
|
|
|
|
FreeXid(xid);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_writepage(struct page* page, struct writeback_control *wbc)
|
|
{
|
|
int rc = -EFAULT;
|
|
int xid;
|
|
|
|
xid = GetXid();
|
|
/* BB add check for wbc flags */
|
|
page_cache_get(page);
|
|
if (!PageUptodate(page)) {
|
|
cFYI(1, ("ppw - page not up to date"));
|
|
}
|
|
|
|
rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
|
|
SetPageUptodate(page); /* BB add check for error and Clearuptodate? */
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_commit_write(struct file *file, struct page *page,
|
|
unsigned offset, unsigned to)
|
|
{
|
|
int xid;
|
|
int rc = 0;
|
|
struct inode *inode = page->mapping->host;
|
|
loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
|
|
char *page_data;
|
|
|
|
xid = GetXid();
|
|
cFYI(1, ("commit write for page %p up to position %lld for %d",
|
|
page, position, to));
|
|
if (position > inode->i_size) {
|
|
i_size_write(inode, position);
|
|
/* if (file->private_data == NULL) {
|
|
rc = -EBADF;
|
|
} else {
|
|
open_file = (struct cifsFileInfo *)file->private_data;
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
rc = -EAGAIN;
|
|
while (rc == -EAGAIN) {
|
|
if ((open_file->invalidHandle) &&
|
|
(!open_file->closePend)) {
|
|
rc = cifs_reopen_file(
|
|
file->f_dentry->d_inode, file);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
if (!open_file->closePend) {
|
|
rc = CIFSSMBSetFileSize(xid,
|
|
cifs_sb->tcon, position,
|
|
open_file->netfid,
|
|
open_file->pid, FALSE);
|
|
} else {
|
|
rc = -EBADF;
|
|
break;
|
|
}
|
|
}
|
|
cFYI(1, (" SetEOF (commit write) rc = %d", rc));
|
|
} */
|
|
}
|
|
if (!PageUptodate(page)) {
|
|
position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset;
|
|
/* can not rely on (or let) writepage write this data */
|
|
if (to < offset) {
|
|
cFYI(1, ("Illegal offsets, can not copy from %d to %d",
|
|
offset, to));
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
/* 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);
|
|
rc = cifs_write(file, page_data + offset, to-offset,
|
|
&position);
|
|
if (rc > 0)
|
|
rc = 0;
|
|
/* else if (rc < 0) should we set writebehind rc? */
|
|
kunmap(page);
|
|
} else {
|
|
set_page_dirty(page);
|
|
}
|
|
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
|
|
{
|
|
int xid;
|
|
int rc = 0;
|
|
struct inode *inode = file->f_dentry->d_inode;
|
|
|
|
xid = GetXid();
|
|
|
|
cFYI(1, ("Sync file - name: %s datasync: 0x%x ",
|
|
dentry->d_name.name, datasync));
|
|
|
|
rc = filemap_fdatawrite(inode->i_mapping);
|
|
if (rc == 0)
|
|
CIFS_I(inode)->write_behind_rc = 0;
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/* static int cifs_sync_page(struct page *page)
|
|
{
|
|
struct address_space *mapping;
|
|
struct inode *inode;
|
|
unsigned long index = page->index;
|
|
unsigned int rpages = 0;
|
|
int rc = 0;
|
|
|
|
cFYI(1, ("sync page %p",page));
|
|
mapping = page->mapping;
|
|
if (!mapping)
|
|
return 0;
|
|
inode = mapping->host;
|
|
if (!inode)
|
|
return 0; */
|
|
|
|
/* fill in rpages then
|
|
result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
|
|
|
|
/* cFYI(1, ("rpages is %d for sync page of Index %ld ", rpages, index));
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
return 0;
|
|
} */
|
|
|
|
/*
|
|
* As file closes, flush all cached write data for this inode checking
|
|
* for write behind errors.
|
|
*/
|
|
int cifs_flush(struct file *file)
|
|
{
|
|
struct inode * inode = file->f_dentry->d_inode;
|
|
int rc = 0;
|
|
|
|
/* Rather than do the steps manually:
|
|
lock the inode for writing
|
|
loop through pages looking for write behind data (dirty pages)
|
|
coalesce into contiguous 16K (or smaller) chunks to write to server
|
|
send to server (prefer in parallel)
|
|
deal with writebehind errors
|
|
unlock inode for writing
|
|
filemapfdatawrite appears easier for the time being */
|
|
|
|
rc = filemap_fdatawrite(inode->i_mapping);
|
|
if (!rc) /* reset wb rc if we were able to write out dirty pages */
|
|
CIFS_I(inode)->write_behind_rc = 0;
|
|
|
|
cFYI(1, ("Flush inode %p file %p rc %d",inode,file,rc));
|
|
|
|
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();
|
|
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
if (file->private_data == NULL) {
|
|
FreeXid(xid);
|
|
return -EBADF;
|
|
}
|
|
open_file = (struct cifsFileInfo *)file->private_data;
|
|
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
|
|
cFYI(1, ("attempting read on write only file instance"));
|
|
}
|
|
for (total_read = 0, current_offset = read_data;
|
|
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);
|
|
rc = -EAGAIN;
|
|
smb_read_data = NULL;
|
|
while (rc == -EAGAIN) {
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
if ((open_file->invalidHandle) &&
|
|
(!open_file->closePend)) {
|
|
rc = cifs_reopen_file(file->f_dentry->d_inode,
|
|
file, TRUE);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
rc = CIFSSMBRead(xid, pTcon,
|
|
open_file->netfid,
|
|
current_read_size, *poffset,
|
|
&bytes_read, &smb_read_data,
|
|
&buf_type);
|
|
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
|
|
if (smb_read_data) {
|
|
if (copy_to_user(current_offset,
|
|
smb_read_data +
|
|
4 /* RFC1001 length field */ +
|
|
le16_to_cpu(pSMBr->DataOffset),
|
|
bytes_read)) {
|
|
rc = -EFAULT;
|
|
}
|
|
|
|
if(buf_type == CIFS_SMALL_BUFFER)
|
|
cifs_small_buf_release(smb_read_data);
|
|
else if(buf_type == CIFS_LARGE_BUFFER)
|
|
cifs_buf_release(smb_read_data);
|
|
smb_read_data = NULL;
|
|
}
|
|
}
|
|
if (rc || (bytes_read == 0)) {
|
|
if (total_read) {
|
|
break;
|
|
} else {
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
} else {
|
|
cifs_stats_bytes_read(pTcon, bytes_read);
|
|
*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;
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
|
|
xid = GetXid();
|
|
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
if (file->private_data == NULL) {
|
|
FreeXid(xid);
|
|
return -EBADF;
|
|
}
|
|
open_file = (struct cifsFileInfo *)file->private_data;
|
|
|
|
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
|
|
cFYI(1, ("attempting read on write only file instance"));
|
|
|
|
for (total_read = 0, current_offset = read_data;
|
|
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);
|
|
/* For windows me and 9x we do not want to request more
|
|
than it negotiated since it will refuse the read then */
|
|
if((pTcon->ses) &&
|
|
!(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
|
|
current_read_size = min_t(const int, current_read_size,
|
|
pTcon->ses->server->maxBuf - 128);
|
|
}
|
|
rc = -EAGAIN;
|
|
while (rc == -EAGAIN) {
|
|
if ((open_file->invalidHandle) &&
|
|
(!open_file->closePend)) {
|
|
rc = cifs_reopen_file(file->f_dentry->d_inode,
|
|
file, TRUE);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
rc = CIFSSMBRead(xid, pTcon,
|
|
open_file->netfid,
|
|
current_read_size, *poffset,
|
|
&bytes_read, ¤t_offset,
|
|
&buf_type);
|
|
}
|
|
if (rc || (bytes_read == 0)) {
|
|
if (total_read) {
|
|
break;
|
|
} else {
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
} else {
|
|
cifs_stats_bytes_read(pTcon, total_read);
|
|
*poffset += bytes_read;
|
|
}
|
|
}
|
|
FreeXid(xid);
|
|
return total_read;
|
|
}
|
|
|
|
int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct dentry *dentry = file->f_dentry;
|
|
int rc, xid;
|
|
|
|
xid = GetXid();
|
|
rc = cifs_revalidate(dentry);
|
|
if (rc) {
|
|
cFYI(1, ("Validation prior to mmap failed, error=%d", rc));
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
rc = generic_file_mmap(file, vma);
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
|
|
static void cifs_copy_cache_pages(struct address_space *mapping,
|
|
struct list_head *pages, int bytes_read, char *data,
|
|
struct pagevec *plru_pvec)
|
|
{
|
|
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);
|
|
|
|
if (add_to_page_cache(page, mapping, page->index,
|
|
GFP_KERNEL)) {
|
|
page_cache_release(page);
|
|
cFYI(1, ("Add page cache failed"));
|
|
data += PAGE_CACHE_SIZE;
|
|
bytes_read -= PAGE_CACHE_SIZE;
|
|
continue;
|
|
}
|
|
|
|
target = kmap_atomic(page,KM_USER0);
|
|
|
|
if (PAGE_CACHE_SIZE > bytes_read) {
|
|
memcpy(target, data, bytes_read);
|
|
/* zero the tail end of this partial page */
|
|
memset(target + bytes_read, 0,
|
|
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);
|
|
if (!pagevec_add(plru_pvec, page))
|
|
__pagevec_lru_add(plru_pvec);
|
|
data += PAGE_CACHE_SIZE;
|
|
}
|
|
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;
|
|
int bytes_read = 0;
|
|
unsigned int read_size,i;
|
|
char *smb_read_data = NULL;
|
|
struct smb_com_read_rsp *pSMBr;
|
|
struct pagevec lru_pvec;
|
|
struct cifsFileInfo *open_file;
|
|
int buf_type = CIFS_NO_BUFFER;
|
|
|
|
xid = GetXid();
|
|
if (file->private_data == NULL) {
|
|
FreeXid(xid);
|
|
return -EBADF;
|
|
}
|
|
open_file = (struct cifsFileInfo *)file->private_data;
|
|
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
|
|
pTcon = cifs_sb->tcon;
|
|
|
|
pagevec_init(&lru_pvec, 0);
|
|
|
|
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;
|
|
expected_index =
|
|
list_entry(page_list->prev, struct page, lru)->index;
|
|
list_for_each_entry_reverse(tmp_page,page_list,lru) {
|
|
if (tmp_page->index == expected_index) {
|
|
contig_pages++;
|
|
expected_index++;
|
|
} else
|
|
break;
|
|
}
|
|
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);
|
|
|
|
rc = -EAGAIN;
|
|
while (rc == -EAGAIN) {
|
|
if ((open_file->invalidHandle) &&
|
|
(!open_file->closePend)) {
|
|
rc = cifs_reopen_file(file->f_dentry->d_inode,
|
|
file, TRUE);
|
|
if (rc != 0)
|
|
break;
|
|
}
|
|
|
|
rc = CIFSSMBRead(xid, pTcon,
|
|
open_file->netfid,
|
|
read_size, offset,
|
|
&bytes_read, &smb_read_data,
|
|
&buf_type);
|
|
/* BB more RC checks ? */
|
|
if (rc== -EAGAIN) {
|
|
if (smb_read_data) {
|
|
if(buf_type == CIFS_SMALL_BUFFER)
|
|
cifs_small_buf_release(smb_read_data);
|
|
else if(buf_type == CIFS_LARGE_BUFFER)
|
|
cifs_buf_release(smb_read_data);
|
|
smb_read_data = NULL;
|
|
}
|
|
}
|
|
}
|
|
if ((rc < 0) || (smb_read_data == NULL)) {
|
|
cFYI(1, ("Read error in readpages: %d", rc));
|
|
/* clean up remaing pages off list */
|
|
while (!list_empty(page_list) && (i < num_pages)) {
|
|
page = list_entry(page_list->prev, struct page,
|
|
lru);
|
|
list_del(&page->lru);
|
|
page_cache_release(page);
|
|
}
|
|
break;
|
|
} else if (bytes_read > 0) {
|
|
pSMBr = (struct smb_com_read_rsp *)smb_read_data;
|
|
cifs_copy_cache_pages(mapping, page_list, bytes_read,
|
|
smb_read_data + 4 /* RFC1001 hdr */ +
|
|
le16_to_cpu(pSMBr->DataOffset), &lru_pvec);
|
|
|
|
i += bytes_read >> PAGE_CACHE_SHIFT;
|
|
cifs_stats_bytes_read(pTcon, bytes_read);
|
|
if ((int)(bytes_read & PAGE_CACHE_MASK) != bytes_read) {
|
|
i++; /* account for partial page */
|
|
|
|
/* server copy of file can have smaller size
|
|
than client */
|
|
/* BB do we need to verify this common case ?
|
|
this case is ok - if we are at server EOF
|
|
we will hit it on next read */
|
|
|
|
/* while (!list_empty(page_list) && (i < num_pages)) {
|
|
page = list_entry(page_list->prev,
|
|
struct page, list);
|
|
list_del(&page->list);
|
|
page_cache_release(page);
|
|
}
|
|
break; */
|
|
}
|
|
} else {
|
|
cFYI(1, ("No bytes read (%d) at offset %lld . "
|
|
"Cleaning remaining pages from readahead list",
|
|
bytes_read, offset));
|
|
/* BB turn off caching and do new lookup on
|
|
file size at server? */
|
|
while (!list_empty(page_list) && (i < num_pages)) {
|
|
page = list_entry(page_list->prev, struct page,
|
|
lru);
|
|
list_del(&page->lru);
|
|
|
|
/* BB removeme - replace with zero of page? */
|
|
page_cache_release(page);
|
|
}
|
|
break;
|
|
}
|
|
if (smb_read_data) {
|
|
if(buf_type == CIFS_SMALL_BUFFER)
|
|
cifs_small_buf_release(smb_read_data);
|
|
else if(buf_type == CIFS_LARGE_BUFFER)
|
|
cifs_buf_release(smb_read_data);
|
|
smb_read_data = NULL;
|
|
}
|
|
bytes_read = 0;
|
|
}
|
|
|
|
pagevec_lru_add(&lru_pvec);
|
|
|
|
/* need to free smb_read_data buf before exit */
|
|
if (smb_read_data) {
|
|
if(buf_type == CIFS_SMALL_BUFFER)
|
|
cifs_small_buf_release(smb_read_data);
|
|
else if(buf_type == CIFS_LARGE_BUFFER)
|
|
cifs_buf_release(smb_read_data);
|
|
smb_read_data = NULL;
|
|
}
|
|
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
static int cifs_readpage_worker(struct file *file, struct page *page,
|
|
loff_t *poffset)
|
|
{
|
|
char *read_data;
|
|
int rc;
|
|
|
|
page_cache_get(page);
|
|
read_data = kmap(page);
|
|
/* for reads over a certain size could initiate async read ahead */
|
|
|
|
rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
|
|
|
|
if (rc < 0)
|
|
goto io_error;
|
|
else
|
|
cFYI(1, ("Bytes read %d ",rc));
|
|
|
|
file->f_dentry->d_inode->i_atime =
|
|
current_fs_time(file->f_dentry->d_inode->i_sb);
|
|
|
|
if (PAGE_CACHE_SIZE > rc)
|
|
memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
|
|
|
|
flush_dcache_page(page);
|
|
SetPageUptodate(page);
|
|
rc = 0;
|
|
|
|
io_error:
|
|
kunmap(page);
|
|
page_cache_release(page);
|
|
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) {
|
|
FreeXid(xid);
|
|
return -EBADF;
|
|
}
|
|
|
|
cFYI(1, ("readpage %p at offset %d 0x%x\n",
|
|
page, (int)offset, (int)offset));
|
|
|
|
rc = cifs_readpage_worker(file, page, &offset);
|
|
|
|
unlock_page(page);
|
|
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/* 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
|
|
refreshing the inode only on increases in the file size
|
|
but this is tricky to do without racing with writebehind
|
|
page caching in the current Linux kernel design */
|
|
int is_size_safe_to_change(struct cifsInodeInfo *cifsInode)
|
|
{
|
|
struct cifsFileInfo *open_file = NULL;
|
|
|
|
if (cifsInode)
|
|
open_file = find_writable_file(cifsInode);
|
|
|
|
if(open_file) {
|
|
struct cifs_sb_info *cifs_sb;
|
|
|
|
/* there is not actually a write pending so let
|
|
this handle go free and allow it to
|
|
be closable if needed */
|
|
atomic_dec(&open_file->wrtPending);
|
|
|
|
cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
|
|
if ( cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO ) {
|
|
/* since no page cache to corrupt on directio
|
|
we can change size safely */
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
} else
|
|
return 1;
|
|
}
|
|
|
|
static int cifs_prepare_write(struct file *file, struct page *page,
|
|
unsigned from, unsigned to)
|
|
{
|
|
int rc = 0;
|
|
loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
|
|
cFYI(1, ("prepare write for page %p from %d to %d",page,from,to));
|
|
if (!PageUptodate(page)) {
|
|
/* if (to - from != PAGE_CACHE_SIZE) {
|
|
void *kaddr = kmap_atomic(page, KM_USER0);
|
|
memset(kaddr, 0, from);
|
|
memset(kaddr + to, 0, PAGE_CACHE_SIZE - to);
|
|
flush_dcache_page(page);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
} */
|
|
/* If we are writing a full page it will be up to date,
|
|
no need to read from the server */
|
|
if ((to == PAGE_CACHE_SIZE) && (from == 0))
|
|
SetPageUptodate(page);
|
|
|
|
/* might as well read a page, it is fast enough */
|
|
if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
|
|
rc = cifs_readpage_worker(file, page, &offset);
|
|
} else {
|
|
/* should we try using another file handle if there is one -
|
|
how would we lock it to prevent close of that handle
|
|
racing with this read?
|
|
In any case this will be written out by commit_write */
|
|
}
|
|
}
|
|
|
|
/* BB should we pass any errors back?
|
|
e.g. if we do not have read access to the file */
|
|
return 0;
|
|
}
|
|
|
|
struct address_space_operations cifs_addr_ops = {
|
|
.readpage = cifs_readpage,
|
|
.readpages = cifs_readpages,
|
|
.writepage = cifs_writepage,
|
|
.writepages = cifs_writepages,
|
|
.prepare_write = cifs_prepare_write,
|
|
.commit_write = cifs_commit_write,
|
|
.set_page_dirty = __set_page_dirty_nobuffers,
|
|
/* .sync_page = cifs_sync_page, */
|
|
/* .direct_IO = */
|
|
};
|