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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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21
drivers/md/dm.c
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@@ -1808,8 +1808,6 @@ static void dm_wq_work(struct work_struct *work);
static void dm_init_normal_md_queue(struct mapped_device *md)
{
md->use_blk_mq = false;
/*
* Initialize aspects of queue that aren't relevant for blk-mq
*/
@@ -1820,8 +1818,6 @@ static void cleanup_mapped_device(struct mapped_device *md)
{
if (md->wq)
destroy_workqueue(md->wq);
if (md->kworker_task)
kthread_stop(md->kworker_task);
bioset_exit(&md->bs);
bioset_exit(&md->io_bs);
@@ -1888,7 +1884,6 @@ static struct mapped_device *alloc_dev(int minor)
goto bad_io_barrier;
md->numa_node_id = numa_node_id;
md->use_blk_mq = dm_use_blk_mq_default();
md->init_tio_pdu = false;
md->type = DM_TYPE_NONE;
mutex_init(&md->suspend_lock);
@@ -1919,7 +1914,6 @@ static struct mapped_device *alloc_dev(int minor)
INIT_WORK(&md->work, dm_wq_work);
init_waitqueue_head(&md->eventq);
init_completion(&md->kobj_holder.completion);
md->kworker_task = NULL;
md->disk->major = _major;
md->disk->first_minor = minor;
@@ -2219,13 +2213,6 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
switch (type) {
case DM_TYPE_REQUEST_BASED:
dm_init_normal_md_queue(md);
r = dm_old_init_request_queue(md, t);
if (r) {
DMERR("Cannot initialize queue for request-based mapped device");
return r;
}
break;
case DM_TYPE_MQ_REQUEST_BASED:
r = dm_mq_init_request_queue(md, t);
if (r) {
@@ -2331,9 +2318,6 @@ static void __dm_destroy(struct mapped_device *md, bool wait)
blk_set_queue_dying(md->queue);
if (dm_request_based(md) && md->kworker_task)
kthread_flush_worker(&md->kworker);
/*
* Take suspend_lock so that presuspend and postsuspend methods
* do not race with internal suspend.
@@ -2586,11 +2570,8 @@ static int __dm_suspend(struct mapped_device *md, struct dm_table *map,
* Stop md->queue before flushing md->wq in case request-based
* dm defers requests to md->wq from md->queue.
*/
if (dm_request_based(md)) {
if (dm_request_based(md))
dm_stop_queue(md->queue);
if (md->kworker_task)
kthread_flush_worker(&md->kworker);
}
flush_workqueue(md->wq);