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block: avoid to use q->flush_rq directly 

This patch trys to use local variable to access flush request,
so that we can convert to per-queue flush machinery a bit easier.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2014-09-25 23:23:42 +08:00 committed by Jens Axboe
parent 3c09676c12
commit 7ddab5de5b
1 changed files with 9 additions and 8 deletions
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17
block/blk-flush.c
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@ -223,7 +223,7 @@ static void flush_end_io(struct request *flush_rq, int error)
if (q->mq_ops) { if (q->mq_ops) {
spin_lock_irqsave(&q->mq_flush_lock, flags); spin_lock_irqsave(&q->mq_flush_lock, flags);
q->flush_rq->tag = -1; flush_rq->tag = -1;
} }
running = &q->flush_queue[q->flush_running_idx]; running = &q->flush_queue[q->flush_running_idx];
@ -281,6 +281,7 @@ static bool blk_kick_flush(struct request_queue *q)
struct list_head *pending = &q->flush_queue[q->flush_pending_idx]; struct list_head *pending = &q->flush_queue[q->flush_pending_idx];
struct request *first_rq = struct request *first_rq =
list_first_entry(pending, struct request, flush.list); list_first_entry(pending, struct request, flush.list);
struct request *flush_rq = q->flush_rq;
/* C1 described at the top of this file */ /* C1 described at the top of this file */
if (q->flush_pending_idx != q->flush_running_idx || list_empty(pending)) if (q->flush_pending_idx != q->flush_running_idx || list_empty(pending))
@ -298,16 +299,16 @@ static bool blk_kick_flush(struct request_queue *q)
*/ */
q->flush_pending_idx ^= 1; q->flush_pending_idx ^= 1;
blk_rq_init(q, q->flush_rq); blk_rq_init(q, flush_rq);
if (q->mq_ops) if (q->mq_ops)
blk_mq_clone_flush_request(q->flush_rq, first_rq); blk_mq_clone_flush_request(flush_rq, first_rq);
q->flush_rq->cmd_type = REQ_TYPE_FS; flush_rq->cmd_type = REQ_TYPE_FS;
q->flush_rq->cmd_flags = WRITE_FLUSH | REQ_FLUSH_SEQ; flush_rq->cmd_flags = WRITE_FLUSH | REQ_FLUSH_SEQ;
q->flush_rq->rq_disk = first_rq->rq_disk; flush_rq->rq_disk = first_rq->rq_disk;
q->flush_rq->end_io = flush_end_io; flush_rq->end_io = flush_end_io;
return blk_flush_queue_rq(q->flush_rq, false); return blk_flush_queue_rq(flush_rq, false);
} }
static void flush_data_end_io(struct request *rq, int error) static void flush_data_end_io(struct request *rq, int error)