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| author | Shaohua Li <shli@kernel.org> | 2014-05-30 08:06:42 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-05-30 08:06:42 -0600 |
| commit | 2230237500821aedfcf2bba2a79d9cbca389233c (patch) | |
| tree | b4b7bee385293f8cc318fb309909ca3e701b903b | |
| parent | da52f22fa924b4a21d8e11fbfd3eeebd7a90a366 (diff) | |
| download | linux-2230237500821aedfcf2bba2a79d9cbca389233c.tar.gz linux-2230237500821aedfcf2bba2a79d9cbca389233c.tar.bz2 linux-2230237500821aedfcf2bba2a79d9cbca389233c.zip | |
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 <shli@fusionio.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-flush.c | 4 | ||||
| -rw-r--r-- | block/blk-mq.c | 12 | ||||
| -rw-r--r-- | include/linux/blk-mq.h | 2 |
3 files changed, 13 insertions, 5 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c index ef608b35d9be..ff87c664b7df 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 6160128085fc..21f952ab3581 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)) diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 95de239444d2..ad3adb73cc70 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -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); |