From 2230237500821aedfcf2bba2a79d9cbca389233c Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Fri, 30 May 2014 08:06:42 -0600 Subject: blk-mq: blk_mq_tag_to_rq should handle flush request 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 Signed-off-by: Jens Axboe --- block/blk-flush.c | 4 +++- block/blk-mq.c | 12 +++++++++--- 2 files changed, 12 insertions(+), 4 deletions(-) (limited to 'block') diff --git a/block/blk-flush.c b/block/blk-flush.c index ef608b35d9be2..ff87c664b7df6 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -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); diff --git a/block/blk-mq.c b/block/blk-mq.c index 6160128085fc8..21f952ab35819 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -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)) -- cgit v1.2.3