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

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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>
This commit is contained in:
Konstantin Khlebnikov
2020-09-23 16:06:52 -04:00
committed by Jens Axboe
parent 021a24460d
commit 6abc49468e
4 changed files with 44 additions and 3 deletions
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6
include/linux/device-mapper.h
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@@ -252,6 +252,12 @@ struct target_type {
#define DM_TARGET_ZONED_HM 0x00000040
#define dm_target_supports_zoned_hm(type) ((type)->features & DM_TARGET_ZONED_HM)
/*
* A target handles REQ_NOWAIT
*/
#define DM_TARGET_NOWAIT 0x00000080
#define dm_target_supports_nowait(type) ((type)->features & DM_TARGET_NOWAIT)
struct dm_target {
struct dm_table *table;
struct target_type *type;