[CIFS] Add support for posix open during lookup
This patch by utilizing lookup intents, and thus removing a network
roundtrip in the open path, improves performance dramatically on
open (30% or more) to Samba and other servers which support the
cifs posix extensions
Signed-off-by: Shirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index dfd3e6c..48c9ae0 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -46,7 +46,7 @@
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 */
@@ -284,34 +284,33 @@
cifs_sb = CIFS_SB(inode->i_sb);
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 */
+ /* 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;
+ /* needed for writepage */
+ pCifsFile->pfile = file;
- file->private_data = pCifsFile;
- break;
- }
+ 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));
- }
+ }
+ read_unlock(&GlobalSMBSeslock);
+
+ if (file->private_data != NULL) {
+ rc = 0;
+ FreeXid(xid);
+ return rc;
+ } else {
+ if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL))
+ cERROR(1, ("could not find file instance for "
+ "new file %p", file));
}
full_path = build_path_from_dentry(file->f_path.dentry);
@@ -500,9 +499,9 @@
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;
}
@@ -533,7 +532,7 @@
if (full_path == NULL) {
rc = -ENOMEM;
reopen_error_exit:
- up(&pCifsFile->fh_sem);
+ mutex_lock(&pCifsFile->fh_mutex);
FreeXid(xid);
return rc;
}
@@ -575,14 +574,14 @@
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) {
