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Commit 1894e916 authored by Jens Axboe's avatar Jens Axboe
Browse files

loop: remove cmd->rq member 



We can always get at the request from the payload, no need to store
a pointer to it.

Reviewed-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 1dc3039b

drivers/block/loop.c

+19 −17
Original line number Diff line number Diff line
@@ -452,9 +452,9 @@ static void lo_complete_rq(struct request *rq) 
{

	struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);



	if (unlikely(req_op(cmd->rq) == REQ_OP_READ && cmd->use_aio &&

		     cmd->ret >= 0 && cmd->ret < blk_rq_bytes(cmd->rq))) {

		struct bio *bio = cmd->rq->bio;

	if (unlikely(req_op(rq) == REQ_OP_READ && cmd->use_aio &&

		     cmd->ret >= 0 && cmd->ret < blk_rq_bytes(rq))) {

		struct bio *bio = rq->bio;



		bio_advance(bio, cmd->ret);

		zero_fill_bio(bio);
@@ -465,11 +465,13 @@ static void lo_complete_rq(struct request *rq) 


static void lo_rw_aio_do_completion(struct loop_cmd *cmd)

{

	struct request *rq = blk_mq_rq_from_pdu(cmd);



	if (!atomic_dec_and_test(&cmd->ref))

		return;

	kfree(cmd->bvec);

	cmd->bvec = NULL;

	blk_mq_complete_request(cmd->rq);

	blk_mq_complete_request(rq);

}



static void lo_rw_aio_complete(struct kiocb *iocb, long ret, long ret2)
@@ -487,7 +489,7 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd, 
{

	struct iov_iter iter;

	struct bio_vec *bvec;

	struct request *rq = cmd->rq;

	struct request *rq = blk_mq_rq_from_pdu(cmd);

	struct bio *bio = rq->bio;

	struct file *file = lo->lo_backing_file;

	unsigned int offset;
@@ -1702,15 +1704,16 @@ EXPORT_SYMBOL(loop_unregister_transfer); 
static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,

		const struct blk_mq_queue_data *bd)

{

	struct loop_cmd *cmd = blk_mq_rq_to_pdu(bd->rq);

	struct loop_device *lo = cmd->rq->q->queuedata;

	struct request *rq = bd->rq;

	struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);

	struct loop_device *lo = rq->q->queuedata;



	blk_mq_start_request(bd->rq);

	blk_mq_start_request(rq);



	if (lo->lo_state != Lo_bound)

		return BLK_STS_IOERR;



	switch (req_op(cmd->rq)) {

	switch (req_op(rq)) {

	case REQ_OP_FLUSH:

	case REQ_OP_DISCARD:

	case REQ_OP_WRITE_ZEROES:
@@ -1723,8 +1726,8 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx, 


	/* always use the first bio's css */

#ifdef CONFIG_BLK_CGROUP

	if (cmd->use_aio && cmd->rq->bio && cmd->rq->bio->bi_css) {

		cmd->css = cmd->rq->bio->bi_css;

	if (cmd->use_aio && rq->bio && rq->bio->bi_css) {

		cmd->css = rq->bio->bi_css;

		css_get(cmd->css);

	} else

#endif
@@ -1736,8 +1739,9 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx, 


static void loop_handle_cmd(struct loop_cmd *cmd)

{

	const bool write = op_is_write(req_op(cmd->rq));

	struct loop_device *lo = cmd->rq->q->queuedata;

	struct request *rq = blk_mq_rq_from_pdu(cmd);

	const bool write = op_is_write(req_op(rq));

	struct loop_device *lo = rq->q->queuedata;

	int ret = 0;



	if (write && (lo->lo_flags & LO_FLAGS_READ_ONLY)) {
@@ -1745,12 +1749,12 @@ static void loop_handle_cmd(struct loop_cmd *cmd) 
		goto failed;

	}



	ret = do_req_filebacked(lo, cmd->rq);

	ret = do_req_filebacked(lo, rq);

 failed:

	/* complete non-aio request */

	if (!cmd->use_aio || ret) {

		cmd->ret = ret ? -EIO : 0;

		blk_mq_complete_request(cmd->rq);

		blk_mq_complete_request(rq);

	}

}
@@ -1767,9 +1771,7 @@ static int loop_init_request(struct blk_mq_tag_set *set, struct request *rq, 
{

	struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);



	cmd->rq = rq;

	kthread_init_work(&cmd->work, loop_queue_work);



	return 0;

}

drivers/block/loop.h

+0 −1
Original line number Diff line number Diff line
@@ -66,7 +66,6 @@ struct loop_device { 


struct loop_cmd {

	struct kthread_work work;

	struct request *rq;

	bool use_aio; /* use AIO interface to handle I/O */

	atomic_t ref; /* only for aio */

	long ret;