static void insert_ptr(struct btrfs_trans_handle *trans,
		       struct btrfs_path *path,
		       struct btrfs_disk_key *key, u64 bytenr,
		       int slot, int level)
{
	struct extent_buffer *lower;
	int nritems;
	int ret;

	BUG_ON(!path->nodes[level]);
	btrfs_assert_tree_locked(path->nodes[level]);
	lower = path->nodes[level];
	nritems = btrfs_header_nritems(lower);
	BUG_ON(slot > nritems);
	BUG_ON(nritems == BTRFS_NODEPTRS_PER_BLOCK(trans->fs_info));
	if (slot != nritems) {
		if (level) {
			ret = tree_mod_log_insert_move(lower, slot + 1, slot,
					nritems - slot);
			BUG_ON(ret < 0);
		}
		memmove_extent_buffer(lower,
			      btrfs_node_key_ptr_offset(slot + 1),
			      btrfs_node_key_ptr_offset(slot),
			      (nritems - slot) * sizeof(struct btrfs_key_ptr));
	}
	if (level) {
		ret = tree_mod_log_insert_key(lower, slot, MOD_LOG_KEY_ADD,
				GFP_NOFS);
		BUG_ON(ret < 0);
	}
	btrfs_set_node_key(lower, key, slot);
	btrfs_set_node_blockptr(lower, slot, bytenr);
	WARN_ON(trans->transid == 0);
	btrfs_set_node_ptr_generation(lower, slot, trans->transid);
	btrfs_set_header_nritems(lower, nritems + 1);
	btrfs_mark_buffer_dirty(lower);
}
static void insert_ptr(struct btrfs_trans_handle *trans,
		       struct btrfs_path *path,
		       struct btrfs_disk_key *key, u64 bytenr,
		       int slot, int level)
{
	struct extent_buffer *lower;
	int nritems;
	int ret;

	BUG_ON(!path->nodes[level]);
	btrfs_assert_tree_locked(path->nodes[level]);
	lower = path->nodes[level];
	nritems = btrfs_header_nritems(lower);
	BUG_ON(slot > nritems);
	BUG_ON(nritems == BTRFS_NODEPTRS_PER_BLOCK(trans->fs_info));
	if (slot != nritems) {
		if (level) {
			ret = tree_mod_log_insert_move(lower, slot + 1, slot,
					nritems - slot);
			BUG_ON(ret < 0);
		}
		memmove_extent_buffer(lower,
			      btrfs_node_key_ptr_offset(slot + 1),
			      btrfs_node_key_ptr_offset(slot),
			      (nritems - slot) * sizeof(struct btrfs_key_ptr));
	}
	if (level) {
		ret = tree_mod_log_insert_key(lower, slot, MOD_LOG_KEY_ADD,
				GFP_NOFS);
		BUG_ON(ret < 0);
	}
	btrfs_set_node_key(lower, key, slot);
	btrfs_set_node_blockptr(lower, slot, bytenr);
	WARN_ON(trans->transid == 0);
	btrfs_set_node_ptr_generation(lower, slot, trans->transid);
	btrfs_set_header_nritems(lower, nritems + 1);
	btrfs_mark_buffer_dirty(lower);
}