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>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e5f9b96..09ee92d 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -598,7 +598,7 @@
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