static void ext4_ext_try_to_merge(handle_t *handle,
				  struct inode *inode,
				  struct ext4_ext_path *path,
				  struct ext4_extent *ex)
{
	struct ext4_extent_header *eh;
	unsigned int depth;
	int merge_done = 0;

	depth = ext_depth(inode);
	BUG_ON(path[depth].p_hdr == NULL);
	eh = path[depth].p_hdr;

	if (ex > EXT_FIRST_EXTENT(eh))
		merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1);

	if (!merge_done)
		(void) ext4_ext_try_to_merge_right(inode, path, ex);

	ext4_ext_try_to_merge_up(handle, inode, path);
}
static void ext4_ext_try_to_merge(handle_t *handle,
				  struct inode *inode,
				  struct ext4_ext_path *path,
				  struct ext4_extent *ex)
{
	struct ext4_extent_header *eh;
	unsigned int depth;
	int merge_done = 0;

	depth = ext_depth(inode);
	BUG_ON(path[depth].p_hdr == NULL);
	eh = path[depth].p_hdr;

	if (ex > EXT_FIRST_EXTENT(eh))
		merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1);

	if (!merge_done)
		(void) ext4_ext_try_to_merge_right(inode, path, ex);

	ext4_ext_try_to_merge_up(handle, inode, path);
}