While I've fixed both ext4 and XFS to not incorrectly allow parallel writers when mounting with -o dax ext4 still has this issue after the iomap conversion. Patch 1 fixes it, and patch 2 adds a lockdep assert to catch any new file systems copy and pasting from the direct I/O path. -- 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