Commit e97c293c authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

block: introduce 'blk_mq_ctx' parameter to blk_get_flush_queue 



This patch adds 'blk_mq_ctx' parameter to blk_get_flush_queue(),
so that this function can find the corresponding blk_flush_queue
bound with current mq context since the flush queue will become
per hw-queue.

For legacy queue, the parameter can be simply 'NULL'.

For multiqueue case, the parameter should be set as the context
from which the related request is originated. With this context
info, the hw queue and related flush queue can be found easily.

Signed-off-by: default avatarMing Lei <ming.lei@canonical.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 0bae352d

block/blk-core.c

+1 −1
Original line number Diff line number Diff line
@@ -390,7 +390,7 @@ static void __blk_drain_queue(struct request_queue *q, bool drain_all) 
		 * be drained.  Check all the queues and counters.

		 */

		if (drain_all) {

			struct blk_flush_queue *fq = blk_get_flush_queue(q);

			struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL);

			drain |= !list_empty(&q->queue_head);

			for (i = 0; i < 2; i++) {

				drain |= q->nr_rqs[i];

block/blk-flush.c

+5 −6
Original line number Diff line number Diff line
@@ -223,7 +223,7 @@ static void flush_end_io(struct request *flush_rq, int error) 
	bool queued = false;

	struct request *rq, *n;

	unsigned long flags = 0;

	struct blk_flush_queue *fq = blk_get_flush_queue(q);

	struct blk_flush_queue *fq = blk_get_flush_queue(q, flush_rq->mq_ctx);



	if (q->mq_ops) {

		spin_lock_irqsave(&fq->mq_flush_lock, flags);
@@ -319,7 +319,7 @@ static bool blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq) 
static void flush_data_end_io(struct request *rq, int error)

{

	struct request_queue *q = rq->q;

	struct blk_flush_queue *fq = blk_get_flush_queue(q);

	struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL);



	/*

	 * After populating an empty queue, kick it to avoid stall.  Read
@@ -333,11 +333,10 @@ static void mq_flush_data_end_io(struct request *rq, int error) 
{

	struct request_queue *q = rq->q;

	struct blk_mq_hw_ctx *hctx;

	struct blk_mq_ctx *ctx;

	struct blk_mq_ctx *ctx = rq->mq_ctx;

	unsigned long flags;

	struct blk_flush_queue *fq = blk_get_flush_queue(q);

	struct blk_flush_queue *fq = blk_get_flush_queue(q, ctx);



	ctx = rq->mq_ctx;

	hctx = q->mq_ops->map_queue(q, ctx->cpu);



	/*
@@ -367,7 +366,7 @@ void blk_insert_flush(struct request *rq) 
	struct request_queue *q = rq->q;

	unsigned int fflags = q->flush_flags;	/* may change, cache */

	unsigned int policy = blk_flush_policy(fflags, rq);

	struct blk_flush_queue *fq = blk_get_flush_queue(q);

	struct blk_flush_queue *fq = blk_get_flush_queue(q, rq->mq_ctx);



	/*

	 * @policy now records what operations need to be done.  Adjust

block/blk-mq.c

+2 −1
Original line number Diff line number Diff line
@@ -518,7 +518,8 @@ static inline bool is_flush_request(struct request *rq, 
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag)

{

	struct request *rq = tags->rqs[tag];

	struct blk_flush_queue *fq = blk_get_flush_queue(rq->q);

	/* mq_ctx of flush rq is always cloned from the corresponding req */

	struct blk_flush_queue *fq = blk_get_flush_queue(rq->q, rq->mq_ctx);



	if (!is_flush_request(rq, fq, tag))

		return rq;

block/blk.h

+2 −2
Original line number Diff line number Diff line
@@ -29,7 +29,7 @@ extern struct kobj_type blk_queue_ktype; 
extern struct ida blk_queue_ida;



static inline struct blk_flush_queue *blk_get_flush_queue(

		struct request_queue *q)

		struct request_queue *q, struct blk_mq_ctx *ctx)

{

	return q->fq;

}
@@ -106,7 +106,7 @@ void blk_insert_flush(struct request *rq); 
static inline struct request *__elv_next_request(struct request_queue *q)

{

	struct request *rq;

	struct blk_flush_queue *fq = blk_get_flush_queue(q);

	struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL);



	while (1) {

		if (!list_empty(&q->queue_head)) {

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