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blk-mq: blk_mq_tag_to_rq should handle flush request

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flush request is special, which borrows the tag from the parent
request. Hence blk_mq_tag_to_rq needs special handling to return
the flush request from the tag.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Shaohua Li 2014-05-30 08:06:42 -06:00 committed by Jens Axboe
parent da52f22fa9
commit 2230237500
3 changed files with 13 additions and 5 deletions
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4
block/blk-flush.c
View File

@ -223,8 +223,10 @@ static void flush_end_io(struct request *flush_rq, int error)
struct request *rq, *n;
unsigned long flags = 0;
if (q->mq_ops)
if (q->mq_ops) {
spin_lock_irqsave(&q->mq_flush_lock, flags);
q->flush_rq->cmd_flags = 0;
}
running = &q->flush_queue[q->flush_running_idx];
BUG_ON(q->flush_pending_idx == q->flush_running_idx);

12
block/blk-mq.c
View File

@ -541,9 +541,15 @@ void blk_mq_kick_requeue_list(struct request_queue *q)
}
EXPORT_SYMBOL(blk_mq_kick_requeue_list);
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag)
struct request *blk_mq_tag_to_rq(struct blk_mq_hw_ctx *hctx, unsigned int tag)
{
return tags->rqs[tag];
struct request_queue *q = hctx->queue;
if ((q->flush_rq->cmd_flags & REQ_FLUSH_SEQ) &&
q->flush_rq->tag == tag)
return q->flush_rq;
return hctx->tags->rqs[tag];
}
EXPORT_SYMBOL(blk_mq_tag_to_rq);
@ -572,7 +578,7 @@ static void blk_mq_timeout_check(void *__data, unsigned long *free_tags)
if (tag >= hctx->tags->nr_tags)
break;
rq = blk_mq_tag_to_rq(hctx->tags, tag++);
rq = blk_mq_tag_to_rq(hctx, tag++);
if (rq->q != hctx->queue)
continue;
if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))

2
include/linux/blk-mq.h
View File

@ -154,7 +154,7 @@ void blk_mq_free_request(struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
gfp_t gfp, bool reserved);
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
struct request *blk_mq_tag_to_rq(struct blk_mq_hw_ctx *hctx, unsigned int tag);
struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int);