Commit 8727af4b authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

blk-mq: make ->flush_rq fully transparent to drivers 



Drivers shouldn't have to care about the block layer setting aside a
request to implement the flush state machine.  We already override the
mq context and tag to make it more transparent, but so far haven't deal
with the driver private data in the request.  Make sure to override this
as well, and while we're at it add a proper helper sitting in blk-mq.c
that implements the full impersonation.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 9d74e257

block/blk-flush.c

+2 −10
Original line number Diff line number Diff line
@@ -307,16 +307,8 @@ static bool blk_kick_flush(struct request_queue *q) 
	q->flush_pending_idx ^= 1;



	blk_rq_init(q, q->flush_rq);

	if (q->mq_ops) {

		/*

		 * Reuse the tag value from the fist waiting request,

		 * with blk-mq the tag is generated during request

		 * allocation and drivers can rely on it being inside

		 * the range they asked for.

		 */

		q->flush_rq->mq_ctx = first_rq->mq_ctx;

		q->flush_rq->tag = first_rq->tag;

	}

	if (q->mq_ops)

		blk_mq_clone_flush_request(q->flush_rq, first_rq);



	q->flush_rq->cmd_type = REQ_TYPE_FS;

	q->flush_rq->cmd_flags = WRITE_FLUSH | REQ_FLUSH_SEQ;

block/blk-mq.c

+20 −0
Original line number Diff line number Diff line
@@ -275,6 +275,26 @@ void blk_mq_free_request(struct request *rq) 
	__blk_mq_free_request(hctx, ctx, rq);

}



/*

 * Clone all relevant state from a request that has been put on hold in

 * the flush state machine into the preallocated flush request that hangs

 * off the request queue.

 *

 * For a driver the flush request should be invisible, that's why we are

 * impersonating the original request here.

 */

void blk_mq_clone_flush_request(struct request *flush_rq,

		struct request *orig_rq)

{

	struct blk_mq_hw_ctx *hctx =

		orig_rq->q->mq_ops->map_queue(orig_rq->q, orig_rq->mq_ctx->cpu);



	flush_rq->mq_ctx = orig_rq->mq_ctx;

	flush_rq->tag = orig_rq->tag;

	memcpy(blk_mq_rq_to_pdu(flush_rq), blk_mq_rq_to_pdu(orig_rq),

		hctx->cmd_size);

}



bool blk_mq_end_io_partial(struct request *rq, int error, unsigned int nr_bytes)

{

	if (blk_update_request(rq, error, blk_rq_bytes(rq)))

block/blk-mq.h

+2 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); 
void blk_mq_init_flush(struct request_queue *q);

void blk_mq_drain_queue(struct request_queue *q);

void blk_mq_free_queue(struct request_queue *q);

void blk_mq_clone_flush_request(struct request *flush_rq,

		struct request *orig_rq);



/*

 * CPU hotplug helpers

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