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btrfs: use btrfs_read_extent_buffer() in do_walk_down()
Currently if our extent buffer isn't uptodate we will drop the lock, free it, and then call read_tree_block() for the bytenr. This is inefficient, we already have the extent buffer, we can simply call btrfs_read_extent_buffer(). Merge these two cases down into one if statement, if we are not uptodate we can drop the lock, trigger readahead, and do the read using btrfs_read_extent_buffer(), and carry on. Signed-off-by: Josef Bacik <[email protected]> Reviewed-by: David Sterba <[email protected]> Signed-off-by: David Sterba <[email protected]>
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