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blk-mq: Add helper to abort requeued requests 

Adds a helper function a driver can use to abort requeued requests in
case any are pending when h/w queues are being removed.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2015-01-07 18:55:45 -07:00
parent c68ed59f53
commit 1885b24d23
2 changed files with 21 additions and 0 deletions
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20
block/blk-mq.c
View File

@ -539,6 +539,26 @@ void blk_mq_kick_requeue_list(struct request_queue *q)
}
EXPORT_SYMBOL(blk_mq_kick_requeue_list);
void blk_mq_abort_requeue_list(struct request_queue *q)
{
unsigned long flags;
LIST_HEAD(rq_list);
spin_lock_irqsave(&q->requeue_lock, flags);
list_splice_init(&q->requeue_list, &rq_list);
spin_unlock_irqrestore(&q->requeue_lock, flags);
while (!list_empty(&rq_list)) {
struct request *rq;
rq = list_first_entry(&rq_list, struct request, queuelist);
list_del_init(&rq->queuelist);
rq->errors = -EIO;
blk_mq_end_request(rq, rq->errors);
}
}
EXPORT_SYMBOL(blk_mq_abort_requeue_list);
static inline bool is_flush_request(struct request *rq,
struct blk_flush_queue *fq, unsigned int tag)
{

1
include/linux/blk-mq.h
View File

@ -203,6 +203,7 @@ void blk_mq_requeue_request(struct request *rq);
void blk_mq_add_to_requeue_list(struct request *rq, bool at_head);
void blk_mq_cancel_requeue_work(struct request_queue *q);
void blk_mq_kick_requeue_list(struct request_queue *q);
void blk_mq_abort_requeue_list(struct request_queue *q);
void blk_mq_complete_request(struct request *rq);
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);