dm: remove request-based logic from make_request_fn wrapper
The old dm_request() method used for q->make_request_fn had a branch for
request-based DM support but it isn't needed given that
dm_init_request_based_queue() sets it to the standard blk_queue_bio()
anyway.
Cleanup dm_init_md_queue() to be DM device-type agnostic and have
dm_setup_md_queue() properly finish queue setup based on DM device-type
(bio-based vs request-based).
A followup block patch can be made to remove the export for
blk_queue_bio() now that DM no longer calls it directly.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index cc8aed2..43e0d1a 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1693,7 +1693,7 @@
* The request function that just remaps the bio built up by
* dm_merge_bvec.
*/
-static void _dm_request(struct request_queue *q, struct bio *bio)
+static void dm_make_request(struct request_queue *q, struct bio *bio)
{
int rw = bio_data_dir(bio);
struct mapped_device *md = q->queuedata;
@@ -1725,16 +1725,6 @@
return blk_queue_stackable(md->queue);
}
-static void dm_request(struct request_queue *q, struct bio *bio)
-{
- struct mapped_device *md = q->queuedata;
-
- if (dm_request_based(md))
- blk_queue_bio(q, bio);
- else
- _dm_request(q, bio);
-}
-
static void dm_dispatch_clone_request(struct request *clone, struct request *rq)
{
int r;
@@ -2100,9 +2090,8 @@
md->queue->queuedata = md;
md->queue->backing_dev_info.congested_fn = dm_any_congested;
md->queue->backing_dev_info.congested_data = md;
- blk_queue_make_request(md->queue, dm_request);
+
blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
- blk_queue_merge_bvec(md->queue, dm_merge_bvec);
}
/*
@@ -2335,7 +2324,7 @@
if (!q->merge_bvec_fn)
return 0;
- if (q->make_request_fn == dm_request) {
+ if (q->make_request_fn == dm_make_request) {
dev_md = q->queuedata;
if (test_bit(DMF_MERGE_IS_OPTIONAL, &dev_md->flags))
return 0;
@@ -2545,9 +2534,15 @@
*/
int dm_setup_md_queue(struct mapped_device *md)
{
- if (dm_md_type_request_based(md) && !dm_init_request_based_queue(md)) {
- DMWARN("Cannot initialize queue for request-based mapped device");
- return -EINVAL;
+ if (dm_md_type_request_based(md)) {
+ if (!dm_init_request_based_queue(md)) {
+ DMWARN("Cannot initialize queue for request-based mapped device");
+ return -EINVAL;
+ }
+ } else {
+ /* bio-based specific initialization */
+ blk_queue_make_request(md->queue, dm_make_request);
+ blk_queue_merge_bvec(md->queue, dm_merge_bvec);
}
return 0;