CIFS: Simplify cifs_open code

Make the code more general for use in posix and non-posix open.
Reviewed-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NPavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>

fs/cifs/file.c

@@ -340,6 +340,7 @@ int cifs_open(struct inode *inode, struct file *file)
 	struct cifsFileInfo *pCifsFile = NULL;
 	struct cifsInodeInfo *pCifsInode;
 	char *full_path = NULL;
+	bool posix_open_ok = false;
 	__u16 netfid;
 
 	xid = GetXid();
@@ -378,17 +379,7 @@ int cifs_open(struct inode *inode, struct file *file)
 				file->f_flags, &oplock, &netfid, xid);
 		if (rc == 0) {
 			cFYI(1, "posix open succeeded");
-
-			pCifsFile = cifs_new_fileinfo(netfid, file, tlink,
-						      oplock);
-			if (pCifsFile == NULL) {
-				CIFSSMBClose(xid, tcon, netfid);
-				rc = -ENOMEM;
-			}
-
-			cifs_fscache_set_inode_cookie(inode, file);
-
-			goto out;
+			posix_open_ok = true;
 		} else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
 			if (tcon->ses->serverNOS)
 				cERROR(1, "server %s of type %s returned"
@@ -405,23 +396,25 @@ int cifs_open(struct inode *inode, struct file *file)
 		   or DFS errors */
 	}
 
-	rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, file->f_flags,
-			  &oplock, &netfid, xid);
+	if (!posix_open_ok) {
+		rc = cifs_nt_open(full_path, inode, cifs_sb, tcon,
+				  file->f_flags, &oplock, &netfid, xid);
 		if (rc)
 			goto out;
+	}
 
 	pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock);
 	if (pCifsFile == NULL) {
+		CIFSSMBClose(xid, tcon, netfid);
 		rc = -ENOMEM;
 		goto out;
 	}
 
 	cifs_fscache_set_inode_cookie(inode, file);
 
-	if (oplock & CIFS_CREATE_ACTION) {
+	if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
 		/* time to set mode which we can not set earlier due to
 		   problems creating new read-only files */
-		if (tcon->unix_ext) {
 		struct cifs_unix_set_info_args args = {
 			.mode	= inode->i_mode,
 			.uid	= NO_CHANGE_64,
@@ -436,7 +429,6 @@ int cifs_open(struct inode *inode, struct file *file)
 				       cifs_sb->mnt_cifs_flags &
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
 	}
-	}
 
 out:
 	kfree(full_path);