On Wed, Nov 22, 2017 at 1:10 PM, Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx> wrote: > If you strace blkid you see that it seeks several positions and reads them. Yes, of course, but that doesn't change that an XFS superblock within a bcache will not be at the expected offset on the backing device. Mike -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html