InnoDB: os0file.c:

  Do not lock raw devices or files opened for read only

innobase/os/os0file.c

@@ -387,22 +387,19 @@ os_file_lock(
 /*=========*/
 				/* out: 0 on success */
 	int		fd,	/* in: file descriptor */
-	const char*	name,	/* in: file name */
-        uint lock_type)         /* in: lock_type */
+	const char*	name)	/* in: file name */
 {
 	struct flock lk;
-	lk.l_type = lock_type;
+	lk.l_type = F_WRLCK;
 	lk.l_whence = SEEK_SET;
 	lk.l_start = lk.l_len = 0;
 	if (fcntl(fd, F_SETLK, &lk) == -1) {
 		fprintf(stderr,
-			"InnoDB: Unable to lock %s with lock %d, error: %d",
-                        name, lock_type, errno);
-		perror (": fcntl");
+			"InnoDB: Unable to lock %s, error: %d", name, errno);
 		close(fd);
 		return(-1);
 	}
-	return 0;
+	return(0);
 }
 #endif /* USE_FILE_LOCK */
 
@@ -869,7 +866,8 @@ try_again:
 			goto try_again;
 		}
 #ifdef USE_FILE_LOCK
-	} else if (os_file_lock(file, name, F_WRLCK)) {
+	} else if (access_type == OS_FILE_READ_WRITE
+			&& os_file_lock(file, name)) {
 		*success = FALSE;
 		file = -1;
 #endif
@@ -980,7 +978,8 @@ os_file_create_simple_no_error_handling(
 	if (file == -1) {
 		*success = FALSE;
 #ifdef USE_FILE_LOCK
-	} else if (os_file_lock(file, name, F_WRLCK)) {
+	} else if (access_type == OS_FILE_READ_WRITE
+			&& os_file_lock(file, name)) {
 		*success = FALSE;
 		file = -1;
 #endif
@@ -1194,7 +1193,8 @@ try_again:
 			goto try_again;
 		}
 #ifdef USE_FILE_LOCK
-	} else if (os_file_lock(file, name, F_WRLCK)) {
+	} else if (create_mode != OS_FILE_OPEN_RAW
+			&& os_file_lock(file, name)) {
 		*success = FALSE;
 		file = -1;
 #endif
@@ -1395,9 +1395,6 @@ os_file_close(
 #else
 	int	ret;
 
-#ifdef USE_FILE_LOCK
-        (void) os_file_lock(file, "unknown", F_UNLCK);
-#endif
 	ret = close(file);
 
 	if (ret == -1) {
@@ -1434,9 +1431,6 @@ os_file_close_no_error_handling(
 #else
 	int	ret;
 
-#ifdef USE_FILE_LOCK
-        (void) os_file_lock(file, "unknown", F_UNLCK);
-#endif
 	ret = close(file);
 
 	if (ret == -1) {