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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>
This commit is contained in:
Gu Jinxiang 2018-04-27 16:22:07 +08:00 committed by David Sterba
parent 4ed0a7a3b7
commit 0338dff6e0
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/volumes.c
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@ -4414,7 +4414,7 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
if (!path)
return -ENOMEM;
path->reada = READA_FORWARD;
path->reada = READA_BACK;
mutex_lock(&fs_info->chunk_mutex);