On Tue, Nov 23, 2021 at 06:56:29PM -0800, Dan Williams wrote:

On Tue, Nov 9, 2021 at 12:34 AM Christoph Hellwig [off-list ref] wrote:

quoted

Prepare from removing the block_device from the DAX I/O path by returning

s/from removing/for the removal of/

Fixed.

quoted

        td->dm_dev.bdev = bdev;
-       td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev);
+       td->dm_dev.dax_dev = fs_dax_get_by_bdev(bdev, &part_off);

Perhaps allow NULL as an argument for callers that do not care about
the start offset?

All callers currently care, dm just has another way to get at the
information.  So for now I'd like to not add the NULL special case,
but we can reconsider that as needed if/when more callers show up.