diff --git a/[refs] b/[refs]
index 4b3b85424e4e..6c7bfb7b5e2f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: eabe0444df90b0cdfa7fdc4f0b4b253f0a498ff7
+refs/heads/master: f45a5ef91bef7e02149a216ed6dc3fcdd8b38268
diff --git a/trunk/fs/ext4/ext4_jbd2.h b/trunk/fs/ext4/ext4_jbd2.h
index aeed0bac693b..c8c6885406db 100644
--- a/trunk/fs/ext4/ext4_jbd2.h
+++ b/trunk/fs/ext4/ext4_jbd2.h
@@ -29,11 +29,13 @@
  * block to complete the transaction.
  *
  * For extents-enabled fs we may have to allocate and modify up to
- * 5 levels of tree + root which are stored in the inode. */
+ * 5 levels of tree, data block (for each of these we need bitmap + group
+ * summaries), root which is stored in the inode, sb
+ */
 
 #define EXT4_SINGLEDATA_TRANS_BLOCKS(sb)				\
 	(EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)   \
-	 ? 27U : 8U)
+	 ? 20U : 8U)
 
 /* Extended attribute operations touch at most two data buffers,
  * two bitmap buffers, and two group summaries, in addition to the inode