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ublk_drv: define macros for recovery feature and check them

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Define some macros for recovery feature.

UBLK_S_DEV_QUIESCED implies that ublk_device is quiesced
and is ready for recovery. This state can be observed by userspace.

UBLK_F_USER_RECOVERY implies that:
(1) ublk_drv enables recovery feature. It won't let monitor_work to
    automatically abort rqs and release the device.
(2) With a dying ubq_daemon, ublk_drv ends(aborts) rqs issued to
    userspace(ublksrv) before crash.
(3) With a dying ubq_daemon, in task work and ublk_queue_rq(),
    ublk_drv requeues rqs.

Signed-off-by: ZiyangZhang <ZiyangZhang@linux.alibaba.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220923153919.44078-3-ZiyangZhang@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
ZiyangZhang
2022-09-23 23:39:14 +08:00
committed by Jens Axboe
parent ae3f719300
commit 77a440e2cb
2 changed files with 20 additions and 1 deletions
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3
include/uapi/linux/ublk_cmd.h
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@@ -74,9 +74,12 @@
*/
#define UBLK_F_NEED_GET_DATA (1UL << 2)
#define UBLK_F_USER_RECOVERY (1UL << 3)
/* device state */
#define UBLK_S_DEV_DEAD 0
#define UBLK_S_DEV_LIVE 1
#define UBLK_S_DEV_QUIESCED 2
/* shipped via sqe->cmd of io_uring command */
struct ublksrv_ctrl_cmd {