Btrfs: Add data block hints to SSD mode too

Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8f93e06..35e9a7a 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -354,6 +354,7 @@
 	spinlock_t new_trans_lock;
 	u64 delalloc_bytes;
 	u64 last_alloc;
+	u64 last_data_alloc;
 };
 /*
  * in ram representation of the tree.  extent_root is used for all allocations