btrfs: use smaller type for btrfs_path lowest_level

The level is 0..7, we can use smaller type. The size of btrfs_path is now
136 bytes from 144, which is +2 objects that fit into a 4k slab.

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e5f9b96fc86f..09ee92d9670c 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -598,7 +598,7 @@ struct btrfs_path {
         int locks[BTRFS_MAX_LEVEL];
         u8 reada;
         /* keep some upper locks as we walk down */
-        int lowest_level;
+        u8 lowest_level;
 
         /*
          * set by btrfs_split_item, tells search_slot to keep all locks