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block: move ->make_request_fn to struct block_device_operations

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The make_request_fn is a little weird in that it sits directly in
struct request_queue instead of an operation vector.  Replace it with
a block_device_operations method called submit_bio (which describes much
better what it does).  Also remove the request_queue argument to it, as
the queue can be derived pretty trivially from the bio.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2020-07-01 10:59:43 +02:00
committed by Jens Axboe
parent e439ab710f
commit c62b37d96b
36 changed files with 153 additions and 140 deletions
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23
drivers/md/dm.c
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@@ -1770,7 +1770,7 @@ static blk_qc_t dm_process_bio(struct mapped_device *md,
}
/*
* If in ->make_request_fn we need to use blk_queue_split(), otherwise
* If in ->queue_bio we need to use blk_queue_split(), otherwise
* queue_limits for abnormal requests (e.g. discard, writesame, etc)
* won't be imposed.
*/
@@ -1787,7 +1787,7 @@ static blk_qc_t dm_process_bio(struct mapped_device *md,
return __split_and_process_bio(md, map, bio);
}
static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio)
static blk_qc_t dm_submit_bio(struct bio *bio)
{
struct mapped_device *md = bio->bi_disk->private_data;
blk_qc_t ret = BLK_QC_T_NONE;
@@ -1798,12 +1798,12 @@ static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio)
/*
* We are called with a live reference on q_usage_counter, but
* that one will be released as soon as we return. Grab an
* extra one as blk_mq_make_request expects to be able to
* consume a reference (which lives until the request is freed
* in case a request is allocated).
* extra one as blk_mq_submit_bio expects to be able to consume
* a reference (which lives until the request is freed in case a
* request is allocated).
*/
percpu_ref_get(&q->q_usage_counter);
return blk_mq_make_request(q, bio);
percpu_ref_get(&bio->bi_disk->queue->q_usage_counter);
return blk_mq_submit_bio(bio);
}
map = dm_get_live_table(md, &srcu_idx);
@@ -1988,11 +1988,11 @@ static struct mapped_device *alloc_dev(int minor)
spin_lock_init(&md->uevent_lock);
/*
* default to bio-based required ->make_request_fn until DM
* table is loaded and md->type established. If request-based
* table is loaded: blk-mq will override accordingly.
* default to bio-based until DM table is loaded and md->type
* established. If request-based table is loaded: blk-mq will
* override accordingly.
*/
md->queue = blk_alloc_queue(dm_make_request, numa_node_id);
md->queue = blk_alloc_queue(numa_node_id);
if (!md->queue)
goto bad;
@@ -3232,6 +3232,7 @@ static const struct pr_ops dm_pr_ops = {
};
static const struct block_device_operations dm_blk_dops = {
.submit_bio = dm_submit_bio,
.open = dm_blk_open,
.release = dm_blk_close,
.ioctl = dm_blk_ioctl,