tree bc4c7489f07e17a9b4328b6c135871811f541027
parent 021a24460dc28e7412aecfae89f60e1847e685c0
author Konstantin Khlebnikov <khlebnikov@yandex-team.ru> 1600891612 -0400
committer Jens Axboe <axboe@kernel.dk> 1601043603 -0600

dm: add support for REQ_NOWAIT and enable it for linear target

Add DM target feature flag DM_TARGET_NOWAIT which advertises that
target works with REQ_NOWAIT bios.

Add dm_table_supports_nowait() and update dm_table_set_restrictions()
to set/clear QUEUE_FLAG_NOWAIT accordingly.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>