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ublk_drv: support UBLK_F_USER_RECOVERY_REISSUE

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UBLK_F_USER_RECOVERY_REISSUE implies that:
With a dying ubq_daemon, ublk_drv let monitor_work requeues rq issued to
userspace(ublksrv) before the ubq_daemon is dying.

UBLK_F_USER_RECOVERY_REISSUE is designed for backends which:
(1) tolerate double-write since ublk_drv may issue the same rq
    twice.
(2) does not let frontend users get I/O error, such as read-only FS
    and VM backend.

Signed-off-by: ZiyangZhang <ZiyangZhang@linux.alibaba.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220923153919.44078-6-ZiyangZhang@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
ZiyangZhang 2022-09-23 23:39:17 +08:00 • committed by Jens Axboe
parent bbae8d1f52
commit a0d41dc113
2 changed files with 20 additions and 4 deletions
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2
include/uapi/linux/ublk_cmd.h
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@ -76,6 +76,8 @@
#define UBLK_F_USER_RECOVERY (1UL << 3)
#define UBLK_F_USER_RECOVERY_REISSUE (1UL << 4)
/* device state */
#define UBLK_S_DEV_DEAD 0
#define UBLK_S_DEV_LIVE 1