Hi Dan, this series decouples the DAX from the block layer so that the block_device is not needed at all for the DAX I/O path. Changes since v1: - rebase on latest v5.16-rc - ensure the new dax zeroing helpers are always declared - fix a dax_dev leak in pmem_attach_disk - remove '\n' from an xfs format string - fix a pre-existing error handling bug in alloc_dev - fix a few whitespace issues - tighten an error check - use s64/u64 a little more - improve a few commit messages - add a CONFIG_FS_DAX ifdef to stub out IOMAP_DAX - improve how IOMAP_DAX is introduced and better document why it is added
