Commit b257cf50 authored Dec 31, 2015 by Zhao Lei Committed by David Sterba Feb 18, 2016

btrfs: reada: move reada_extent_put to place after __readahead_hook()



We can't release reada_extent earlier than __readahead_hook(), because
__readahead_hook() still need to use it, it is necessary to hode a refcnt
to avoid it be freed.

Actually it is not a problem after my patch named:
  Avoid many times of empty loop
It make reada_extent in above line include at least one reada_extctl,
which keeps additional one refcnt for reada_extent.

But we still need this patch to make the code in pretty logic.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 1e7970c0

fs/btrfs/reada.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -717,8 +717,6 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
		}
		logical = re->logical;

		reada_extent_put(fs_info, re);

		atomic_inc(&dev->reada_in_flight);
		ret = reada_tree_block_flagged(fs_info->extent_root, logical,
		mirror_num, &eb);
		@@ -730,6 +728,8 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
		if (eb)
		free_extent_buffer(eb);

		reada_extent_put(fs_info, re);

		return 1;

		}