btrfs: use smaller type for btrfs_path reada

The possible values for reada are all positive and bounded, we can later
save some bytes by storing it in u8.

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

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a1cf4c8..e5f9b96 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -596,7 +596,7 @@ struct btrfs_path {
        int slots[BTRFS_MAX_LEVEL];
        /* if there is real range locking, this locks field will change */
        int locks[BTRFS_MAX_LEVEL];
-       int reada;
+       u8 reada;
        /* keep some upper locks as we walk down */
        int lowest_level;