Hello, That would be great, but then how to explain that EXT4_FEATURE_INCOMPAT_FLEX_BG is present in superblock^.s_feature_incompat Which indicates that knowledge of this feature is necessary in the reader -- Felipe Monteiro de Carvalho -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html