memset(private_data, 0, sizeof(struct cifsFileInfo));
private_data->netfid = netfid;
private_data->pid = current->tgid;
- init_MUTEX(&private_data->fh_sem);
+ mutex_init(&private_data->fh_mutex);
mutex_init(&private_data->lock_mutex);
INIT_LIST_HEAD(&private_data->llist);
private_data->pfile = file; /* needed for writepage */
return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
FILE_READ_DATA);
+}
+static inline fmode_t cifs_posix_convert_flags(unsigned int flags)
+{
+ fmode_t posix_flags = 0;
+ if ((flags & O_ACCMODE) == O_RDONLY)
+ posix_flags = FMODE_READ;
+ else if ((flags & O_ACCMODE) == O_WRONLY)
+ posix_flags = FMODE_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; */
+ posix_flags = FMODE_READ | FMODE_WRITE;
+ }
+ /* can not map O_CREAT or O_EXCL or O_TRUNC flags when
+ reopening a file. They had their effect on the original open */
+ if (flags & O_APPEND)
+ posix_flags |= (fmode_t)O_APPEND;
+ if (flags & O_SYNC)
+ posix_flags |= (fmode_t)O_SYNC;
+ if (flags & O_DIRECTORY)
+ posix_flags |= (fmode_t)O_DIRECTORY;
+ if (flags & O_NOFOLLOW)
+ posix_flags |= (fmode_t)O_NOFOLLOW;
+ if (flags & O_DIRECT)
+ posix_flags |= (fmode_t)O_DIRECT;
+
+ return posix_flags;
}
static inline int cifs_get_disposition(unsigned int flags)
}
/* all arguments to this function must be checked for validity in caller */
+static inline int cifs_posix_open_inode_helper(struct inode *inode,
+ struct file *file, struct cifsInodeInfo *pCifsInode,
+ struct cifsFileInfo *pCifsFile, int oplock, u16 netfid)
+{
+
+ write_lock(&GlobalSMBSeslock);
+
+ pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
+ if (pCifsInode == NULL) {
+ write_unlock(&GlobalSMBSeslock);
+ return -EINVAL;
+ }
+
+ if (pCifsInode->clientCanCacheRead) {
+ /* we have the inode open somewhere else
+ no need to discard cache data */
+ goto psx_client_can_cache;
+ }
+
+ /* BB FIXME need to fix this check to move it earlier into posix_open
+ BB fIX following section BB FIXME */
+
+ /* 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_path.dentry->d_inode->i_mtime, &temp) &&
+ (file->f_path.dentry->d_inode->i_size ==
+ (loff_t)le64_to_cpu(buf->EndOfFile))) {
+ cFYI(1, ("inode unchanged on server"));
+ } else {
+ if (file->f_path.dentry->d_inode->i_mapping) {
+ rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping);
+ if (rc != 0)
+ CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc;
+ }
+ cFYI(1, ("invalidating remote inode since open detected it "
+ "changed"));
+ invalidate_remote_inode(file->f_path.dentry->d_inode);
+ } */
+
+psx_client_can_cache:
+ if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
+ pCifsInode->clientCanCacheAll = true;
+ pCifsInode->clientCanCacheRead = true;
+ cFYI(1, ("Exclusive Oplock granted on inode %p",
+ file->f_path.dentry->d_inode));
+ } else if ((oplock & 0xF) == OPLOCK_READ)
+ pCifsInode->clientCanCacheRead = true;
+
+ /* will have to change the unlock if we reenable the
+ filemap_fdatawrite (which does not seem necessary */
+ write_unlock(&GlobalSMBSeslock);
+ return 0;
+}
+
+static struct cifsFileInfo *
+cifs_fill_filedata(struct file *file)
+{
+ struct list_head *tmp;
+ struct cifsFileInfo *pCifsFile = NULL;
+ struct cifsInodeInfo *pCifsInode = NULL;
+
+ /* search inode for this file and fill in file->private_data */
+ pCifsInode = CIFS_I(file->f_path.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) {
+ return pCifsFile;
+ } else if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL))
+ cERROR(1, ("could not find file instance for "
+ "new file %p", file));
+ return NULL;
+}
+
+/* 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,
int rc = -EACCES;
int xid, oplock;
struct cifs_sb_info *cifs_sb;
- struct cifsTconInfo *pTcon;
+ struct cifsTconInfo *tcon;
struct cifsFileInfo *pCifsFile;
struct cifsInodeInfo *pCifsInode;
- struct list_head *tmp;
char *full_path = NULL;
int desiredAccess;
int disposition;
xid = GetXid();
cifs_sb = CIFS_SB(inode->i_sb);
- pTcon = cifs_sb->tcon;
+ tcon = 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_path.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));
- }
+ pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
+ pCifsFile = cifs_fill_filedata(file);
+ if (pCifsFile) {
+ FreeXid(xid);
+ return 0;
}
full_path = build_path_from_dentry(file->f_path.dentry);
cFYI(1, ("inode = 0x%p file flags are 0x%x for %s",
inode, file->f_flags, full_path));
+
+ if (oplockEnabled)
+ oplock = REQ_OPLOCK;
+ else
+ oplock = 0;
+
+ if (!tcon->broken_posix_open && tcon->unix_ext &&
+ (tcon->ses->capabilities & CAP_UNIX) &&
+ (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+ le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+ int oflags = (int) cifs_posix_convert_flags(file->f_flags);
+ /* can not refresh inode info since size could be stale */
+ rc = cifs_posix_open(full_path, &inode, inode->i_sb,
+ cifs_sb->mnt_file_mode /* ignored */,
+ oflags, &oplock, &netfid, xid);
+ if (rc == 0) {
+ cFYI(1, ("posix open succeeded"));
+ /* no need for special case handling of setting mode
+ on read only files needed here */
+
+ pCifsFile = cifs_fill_filedata(file);
+ cifs_posix_open_inode_helper(inode, file, pCifsInode,
+ pCifsFile, oplock, netfid);
+ goto out;
+ } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
+ if (tcon->ses->serverNOS)
+ cERROR(1, ("server %s of type %s returned"
+ " unexpected error on SMB posix open"
+ ", disabling posix open support."
+ " Check if server update available.",
+ tcon->ses->serverName,
+ tcon->ses->serverNOS));
+ tcon->broken_posix_open = true;
+ } else if ((rc != -EIO) && (rc != -EREMOTE) &&
+ (rc != -EOPNOTSUPP)) /* path not found or net err */
+ goto out;
+ /* else fallthrough to retry open the old way on network i/o
+ or DFS errors */
+ }
+
desiredAccess = cifs_convert_flags(file->f_flags);
/*********************************************************************
disposition = cifs_get_disposition(file->f_flags);
- if (oplockEnabled)
- oplock = REQ_OPLOCK;
- else
- oplock = 0;
-
/* BB pass O_SYNC flag through on file attributes .. BB */
/* Also refresh inode by passing in file_info buf returned by SMBOpen
}
if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
- rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
+ rc = CIFSSMBOpen(xid, tcon, 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,
+ rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR);
}
pCifsFile = cifs_init_private(file->private_data, inode, file, netfid);
write_lock(&GlobalSMBSeslock);
- list_add(&pCifsFile->tlist, &pTcon->openFileList);
+ list_add(&pCifsFile->tlist, &tcon->openFileList);
pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
if (pCifsInode) {
rc = cifs_open_inode_helper(inode, file, pCifsInode,
- pCifsFile, pTcon,
+ pCifsFile, tcon,
&oplock, buf, full_path, xid);
} else {
write_unlock(&GlobalSMBSeslock);
if (oplock & CIFS_CREATE_ACTION) {
/* time to set mode which we can not set earlier due to
problems creating new read-only files */
- if (pTcon->unix_ext) {
+ if (tcon->unix_ext) {
struct cifs_unix_set_info_args args = {
.mode = inode->i_mode,
.uid = NO_CHANGE_64,
.mtime = NO_CHANGE_64,
.device = 0,
};
- CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
+ CIFSSMBUnixSetInfo(xid, tcon, full_path, &args,
cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
int rc = -EACCES;
int xid, oplock;
struct cifs_sb_info *cifs_sb;
- struct cifsTconInfo *pTcon;
+ struct cifsTconInfo *tcon;
struct cifsFileInfo *pCifsFile;
struct cifsInodeInfo *pCifsInode;
struct inode *inode;
return -EBADF;
xid = GetXid();
- down(&pCifsFile->fh_sem);
+ mutex_unlock(&pCifsFile->fh_mutex);
if (!pCifsFile->invalidHandle) {
- up(&pCifsFile->fh_sem);
+ mutex_lock(&pCifsFile->fh_mutex);
FreeXid(xid);
return 0;
}
}
cifs_sb = CIFS_SB(inode->i_sb);
- pTcon = cifs_sb->tcon;
+ tcon = 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
if (full_path == NULL) {
rc = -ENOMEM;
reopen_error_exit:
- up(&pCifsFile->fh_sem);
+ mutex_lock(&pCifsFile->fh_mutex);
FreeXid(xid);
return rc;
}
cFYI(1, ("inode = 0x%p file flags 0x%x for %s",
inode, file->f_flags, full_path));
- desiredAccess = cifs_convert_flags(file->f_flags);
if (oplockEnabled)
oplock = REQ_OPLOCK;
else
oplock = 0;
+ if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
+ (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+ le64_to_cpu(tcon->fsUnixInfo.Capability))) {
+ int oflags = (int) cifs_posix_convert_flags(file->f_flags);
+ /* can not refresh inode info since size could be stale */
+ rc = cifs_posix_open(full_path, NULL, inode->i_sb,
+ cifs_sb->mnt_file_mode /* ignored */,
+ oflags, &oplock, &netfid, xid);
+ if (rc == 0) {
+ cFYI(1, ("posix reopen succeeded"));
+ goto reopen_success;
+ }
+ /* fallthrough to retry open the old way on errors, especially
+ in the reconnect path it is important to retry hard */
+ }
+
+ desiredAccess = cifs_convert_flags(file->f_flags);
+
/* 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 */
- rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess,
+ rc = CIFSSMBOpen(xid, tcon, 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);
+ mutex_lock(&pCifsFile->fh_mutex);
cFYI(1, ("cifs_open returned 0x%x", rc));
cFYI(1, ("oplock: %d", oplock));
} else {
+reopen_success:
pCifsFile->netfid = netfid;
pCifsFile->invalidHandle = false;
- up(&pCifsFile->fh_sem);
+ mutex_lock(&pCifsFile->fh_mutex);
pCifsInode = CIFS_I(inode);
if (pCifsInode) {
if (can_flush) {
go to server to get inode info */
pCifsInode->clientCanCacheAll = false;
pCifsInode->clientCanCacheRead = false;
- if (pTcon->unix_ext)
+ if (tcon->unix_ext)
rc = cifs_get_inode_info_unix(&inode,
full_path, inode->i_sb, xid);
else
cifs_relock_file(pCifsFile);
}
}
-
kfree(full_path);
FreeXid(xid);
return rc;
pTcon = cifs_sb->tcon;
if (pSMBFile) {
struct cifsLockInfo *li, *tmp;
-
+ write_lock(&GlobalSMBSeslock);
pSMBFile->closePend = true;
if (pTcon) {
/* no sense reconnecting to close a file that is
already closed */
if (!pTcon->need_reconnect) {
+ write_unlock(&GlobalSMBSeslock);
timeout = 2;
while ((atomic_read(&pSMBFile->wrtPending) != 0)
&& (timeout <= 2048)) {
timeout *= 4;
}
if (atomic_read(&pSMBFile->wrtPending))
- cERROR(1,
- ("close with pending writes"));
- rc = CIFSSMBClose(xid, pTcon,
+ cERROR(1, ("close with pending write"));
+ if (!pTcon->need_reconnect &&
+ !pSMBFile->invalidHandle)
+ rc = CIFSSMBClose(xid, pTcon,
pSMBFile->netfid);
- }
- }
+ } else
+ write_unlock(&GlobalSMBSeslock);
+ } else
+ write_unlock(&GlobalSMBSeslock);
/* Delete any outstanding lock records.
We'll lose them when the file is closed anyway. */
pTcon = cifs_sb->tcon;
cFYI(1, ("Freeing private data in close dir"));
+ write_lock(&GlobalSMBSeslock);
if (!pCFileStruct->srch_inf.endOfSearch &&
!pCFileStruct->invalidHandle) {
pCFileStruct->invalidHandle = true;
+ write_unlock(&GlobalSMBSeslock);
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;
- }
+ } else
+ write_unlock(&GlobalSMBSeslock);
ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
if (ptmp) {
cFYI(1, ("closedir free smb buf in srch struct"));
__u64 length;
bool wait_flag = false;
struct cifs_sb_info *cifs_sb;
- struct cifsTconInfo *pTcon;
+ struct cifsTconInfo *tcon;
__u16 netfid;
__u8 lockType = LOCKING_ANDX_LARGE_FILES;
- bool posix_locking;
+ bool posix_locking = 0;
length = 1 + pfLock->fl_end - pfLock->fl_start;
rc = -EACCES;
cFYI(1, ("Unknown type of lock"));
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
- pTcon = cifs_sb->tcon;
+ tcon = cifs_sb->tcon;
if (file->private_data == NULL) {
FreeXid(xid);
}
netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
- posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) &&
- (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability));
-
+ if ((tcon->ses->capabilities & CAP_UNIX) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
+ posix_locking = 1;
/* BB add code here to normalize offset and length to
account for negative length which we can not accept over the
wire */
posix_lock_type = CIFS_RDLCK;
else
posix_lock_type = CIFS_WRLCK;
- rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */,
+ rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */,
length, pfLock,
posix_lock_type, wait_flag);
FreeXid(xid);
}
/* BB we could chain these into one lock request BB */
- rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start,
+ rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start,
0, 1, lockType, 0 /* wait flag */ );
if (rc == 0) {
- rc = CIFSSMBLock(xid, pTcon, netfid, length,
+ rc = CIFSSMBLock(xid, tcon, netfid, length,
pfLock->fl_start, 1 /* numUnlock */ ,
0 /* numLock */ , lockType,
0 /* wait flag */ );
if (numUnlock == 1)
posix_lock_type = CIFS_UNLCK;
- rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */,
+ rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */,
length, pfLock,
posix_lock_type, wait_flag);
} else {
(struct cifsFileInfo *)file->private_data;
if (numLock) {
- rc = CIFSSMBLock(xid, pTcon, netfid, length,
+ rc = CIFSSMBLock(xid, tcon, netfid, length,
pfLock->fl_start,
0, numLock, lockType, wait_flag);
if (pfLock->fl_start <= li->offset &&
(pfLock->fl_start + length) >=
(li->offset + li->length)) {
- stored_rc = CIFSSMBLock(xid, pTcon,
+ stored_rc = CIFSSMBLock(xid, tcon,
netfid,
li->length, li->offset,
1, 0, li->type, false);
return rc;
}
+/*
+ * 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;
+}
+
ssize_t cifs_user_write(struct file *file, const char __user *write_data,
size_t write_size, loff_t *poffset)
{
struct cifsTconInfo *pTcon;
int xid, long_op;
struct cifsFileInfo *open_file;
+ struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode);
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
xid = GetXid();
- if (*poffset > file->f_path.dentry->d_inode->i_size)
- long_op = CIFS_VLONG_OP; /* writes past EOF take long time */
- else
- long_op = CIFS_LONG_OP;
-
+ long_op = cifs_write_timeout(cifsi, *poffset);
for (total_written = 0; write_size > total_written;
total_written += bytes_written) {
rc = -EAGAIN;
FreeXid(xid);
return rc;
}
- } else
+ } else {
+ cifs_update_eof(cifsi, *poffset, bytes_written);
*poffset += bytes_written;
+ }
long_op = CIFS_STD_OP; /* subsequent writes fast -
15 seconds is plenty */
}
struct cifsTconInfo *pTcon;
int xid, long_op;
struct cifsFileInfo *open_file;
+ struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode);
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
xid = GetXid();
- if (*poffset > file->f_path.dentry->d_inode->i_size)
- long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */
- else
- long_op = CIFS_LONG_OP;
-
+ long_op = cifs_write_timeout(cifsi, *poffset);
for (total_written = 0; write_size > total_written;
total_written += bytes_written) {
rc = -EAGAIN;
FreeXid(xid);
return rc;
}
- } else
+ } else {
+ cifs_update_eof(cifsi, *poffset, bytes_written);
*poffset += bytes_written;
+ }
long_op = CIFS_STD_OP; /* subsequent writes fast -
15 seconds is plenty */
}
int nr_pages;
__u64 offset = 0;
struct cifsFileInfo *open_file;
+ struct cifsInodeInfo *cifsi = CIFS_I(mapping->host);
struct page *page;
struct pagevec pvec;
int rc = 0;
int scanned = 0;
- int xid;
+ int xid, long_op;
cifs_sb = CIFS_SB(mapping->host->i_sb);
cERROR(1, ("No writable handles for inode"));
rc = -EBADF;
} else {
+ long_op = cifs_write_timeout(cifsi, offset);
rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
open_file->netfid,
bytes_to_write, offset,
&bytes_written, iov, n_iov,
- CIFS_LONG_OP);
+ long_op);
atomic_dec(&open_file->wrtPending);
+ cifs_update_eof(cifsi, offset, bytes_written);
+
if (rc || bytes_written < bytes_to_write) {
cERROR(1, ("Write2 ret %d, wrote %d",
rc, bytes_written));
cFYI(1, ("write_end for page %p from pos %lld with %d bytes",
page, pos, copied));
- if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
+ if (PageChecked(page)) {
+ if (copied == len)
+ SetPageUptodate(page);
+ ClearPageChecked(page);
+ } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
SetPageUptodate(page);
if (!PageUptodate(page)) {
{
int xid;
int rc = 0;
+ struct cifsTconInfo *tcon;
+ struct cifsFileInfo *smbfile =
+ (struct cifsFileInfo *)file->private_data;
struct inode *inode = file->f_path.dentry->d_inode;
xid = GetXid();
if (rc == 0) {
rc = CIFS_I(inode)->write_behind_rc;
CIFS_I(inode)->write_behind_rc = 0;
+ tcon = CIFS_SB(inode->i_sb)->tcon;
+ if (!rc && tcon && smbfile &&
+ !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
+ rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
}
+
FreeXid(xid);
return rc;
}
{
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
loff_t offset = pos & (PAGE_CACHE_SIZE - 1);
+ loff_t page_start = pos & PAGE_MASK;
+ loff_t i_size;
+ struct page *page;
+ int rc = 0;
cFYI(1, ("write_begin from %lld len %d", (long long)pos, len));
- *pagep = __grab_cache_page(mapping, index);
- if (!*pagep)
- return -ENOMEM;
-
- if (PageUptodate(*pagep))
- return 0;
+ page = grab_cache_page_write_begin(mapping, index, flags);
+ if (!page) {
+ rc = -ENOMEM;
+ goto out;
+ }
- /* If we are writing a full page it will be up to date,
- no need to read from the server */
- if (len == PAGE_CACHE_SIZE && flags & AOP_FLAG_UNINTERRUPTIBLE)
- return 0;
+ if (PageUptodate(page))
+ goto out;
- if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
- int rc;
+ /*
+ * 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;
- /* might as well read a page, it is fast enough */
- rc = cifs_readpage_worker(file, *pagep, &offset);
+ /*
+ * 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;
+ }
+ }
- /* we do not need to pass errors back
- e.g. if we do not have read access to the file
- because cifs_write_end will attempt synchronous writes
- -- shaggy */
+ 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);
} 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
this will be written out by write_end so is fine */
}
-
- return 0;
+out:
+ *pagep = page;
+ return rc;
}
const struct address_space_operations cifs_addr_ops = {
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff