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dm: remove legacy request-based IO path

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dm supports both, and since we're killing off the legacy path in
general, get rid of it in dm.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Jens Axboe
2018-10-10 20:49:26 -06:00
committed by Mike Snitzer
parent 118aa47c70
commit 6a23e05c2f
9 changed files with 36 additions and 393 deletions
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14
drivers/md/dm-mpath.c
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@@ -203,14 +203,7 @@ static struct multipath *alloc_multipath(struct dm_target *ti)
static int alloc_multipath_stage2(struct dm_target *ti, struct multipath *m)
{
if (m->queue_mode == DM_TYPE_NONE) {
/*
* Default to request-based.
*/
if (dm_use_blk_mq(dm_table_get_md(ti->table)))
m->queue_mode = DM_TYPE_MQ_REQUEST_BASED;
else
m->queue_mode = DM_TYPE_REQUEST_BASED;
m->queue_mode = DM_TYPE_MQ_REQUEST_BASED;
} else if (m->queue_mode == DM_TYPE_BIO_BASED) {
INIT_WORK(&m->process_queued_bios, process_queued_bios);
/*
@@ -537,10 +530,7 @@ static int multipath_clone_and_map(struct dm_target *ti, struct request *rq,
* get the queue busy feedback (via BLK_STS_RESOURCE),
* otherwise I/O merging can suffer.
*/
if (q->mq_ops)
return DM_MAPIO_REQUEUE;
else
return DM_MAPIO_DELAY_REQUEUE;
return DM_MAPIO_REQUEUE;
}
clone->bio = clone->biotail = NULL;
clone->rq_disk = bdev->bd_disk;