Btrfs: optimize extent item search in run_delayed_extent_op (55994887) · Commits · 戴 / test

Instead of doing another extent tree search if the first search failed to find a metadata item, check if the previous item in the leaf is an extent item and use it if it is, otherwise do the second tree search for an extent item. Signed-off-by:

Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by:

Josef Bacik <jbacik@fusionio.com> Signed-off-by:

Chris Mason <chris.mason@fusionio.com>

fs/btrfs/extent-tree.c

+20 −7

Original line number	Diff line number	Diff line
		@@ -2130,16 +2130,29 @@ again:
		}
		if (ret > 0) {
		if (metadata) {
		if (path->slots[0] > 0) {
		path->slots[0]--;
		btrfs_item_key_to_cpu(path->nodes[0], &key,
		path->slots[0]);
		if (key.objectid == node->bytenr &&
		key.type == BTRFS_EXTENT_ITEM_KEY &&
		key.offset == node->num_bytes)
		ret = 0;
		}
		if (ret > 0) {
		btrfs_release_path(path);
		metadata = 0;

		key.objectid = node->bytenr;
		key.offset = node->num_bytes;
		key.type = BTRFS_EXTENT_ITEM_KEY;
		goto again;
		}
		} else {
		err = -EIO;
		goto out;
		}
		}

		leaf = path->nodes[0];
		item_size = btrfs_item_size_nr(leaf, path->slots[0]);

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