tree 6c25dba30676482bac12647e1cca2060604f199a
parent 4ed0a7a3b7c3f8387caf2ad57424d9341f523856
author Gu Jinxiang <gujx@cn.fujitsu.com> 1524817327 +0800
committer David Sterba <dsterba@suse.com> 1527523648 +0200

btrfs: do reverse path readahead in btrfs_shrink_device

In btrfs_shrink_device, before btrfs_search_slot, path->reada is set to
READA_FORWARD. But I think READA_BACK is correct.

Since:

 1. key.offset is set to (u64)-1
 2. after btrfs_search_slot, btrfs_previous_item is called

So, for readahead previous items, READA_BACK is the correct one.

Signed-off-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>