On Tue, Mar 02, 2021 at 03:22:50PM -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <djwong@xxxxxxxxxx>
>
> In commit fc7b3903, we tried to make _require_dm_target smart enough to
> _notrun tests that require a device mapper target that isn't compatible
> with "DAX". However, as of this writing, the incompatibility stems from
> device mapper's unwillingness to switch access modes when running atop
> DAX (persistent memory) devices, and has nothing to do with the
> filesystem mount options.
>
> Since filesystems supporting DAX don't universally require "dax" in the
> mount options to enable that functionality, switch the test to query
> sysfs to see if the scratch device supports DAX.
>
> Fixes: fc7b3903 ("dax/dm: disable testing on devices that don't support dax")
> Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Looks good,
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
