[RESEND PATCH V5 3/7] ublk_drv: requeue rqs with recovery feature enabled

ZiyangZhang
2022-09-23T06:16:37Z

With recovery feature enabled, in ublk_queue_rq or task work
(in exit_task_work or fallback wq), we requeue rqs instead of
ending(aborting) them. Besides, No matter recovery feature is enabled
or disabled, we schedule monitor_work immediately.

Signed-off-by: ZiyangZhang <ZiyangZhang@linux.alibaba.com>
---
drivers/block/ublk_drv.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 05bfbaa49696..3ae13e46ece6 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -655,6 +655,16 @@ static void ubq_complete_io_cmd(struct ublk_io *io, int res)

#define UBLK_REQUEUE_DELAY_MS 3

+static inline void __ublk_abort_rq(struct ublk_queue *ubq,
+ struct request *rq)
+{
+ /* We cannot process this rq so just requeue it. */
+ if (ublk_queue_can_use_recovery(ubq))
+ blk_mq_requeue_request(rq, false);
+ else
+ blk_mq_end_request(rq, BLK_STS_IOERR);
+}
+
static inline void __ublk_rq_task_work(struct request *req)
{
struct ublk_queue *ubq = req->mq_hctx->driver_data;
@@ -677,7 +687,7 @@ static inline void __ublk_rq_task_work(struct request *req)
* (2) current->flags & PF_EXITING.
*/
if (unlikely(current != ubq->ubq_daemon || current->flags & PF_EXITING)) {
- blk_mq_end_request(req, BLK_STS_IOERR);
+ __ublk_abort_rq(ubq, req);
mod_delayed_work(system_wq, &ub->monitor_work, 0);
return;
}
@@ -769,7 +779,8 @@ static blk_status_t ublk_queue_rq(struct blk_mq_hw_ctx *hctx,
if (unlikely(ubq_daemon_is_dying(ubq))) {
fail:
mod_delayed_work(system_wq, &ubq->dev->monitor_work, 0);
- return BLK_STS_IOERR;
+ __ublk_abort_rq(ubq, rq);
+ return BLK_STS_OK;
}

if (ublk_can_use_task_work(ubq)) {
--
2.27.0