add: FUNCTION(("vfs_sync: entry.\n"));
context: vfs_sync(void){	struct hash_iterator iter;	struct fs_mount *mount;#if MAKE_NOIZE	dprintf("vfs_sync: entry.\n");#endif	/* cycle through and call sync on each mounted fs */	mutex_lock(&vfs_mount_op_mutex);	mutex_lock(&vfs_mount_mutex);	hash_open(mounts_table, &iter);	while((mount = hash_next(mounts_table, &iter))) {		mount->fs->calls->fs_sync(mount->cookie);	}	hash_close(mounts_table, &iter, false);	mutex_unlock(&vfs_mount_mutex);	mutex_unlock(&vfs_mount_op_mutex);	return 0;}