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loop: remove cmd->rq member

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

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-04-13 16:24:29 -06:00
parent 1dc3039bc8
commit 1894e91654
2 changed files with 19 additions and 18 deletions
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36
drivers/block/loop.c
View File

@ -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;
}

1
drivers/block/loop.h
View File

@ -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;