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dm: remove support for stacking dm-mq on .request_fn device(s)

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Remove all fiddley code that propped up this support for a blk-mq
request-queue ontop of all .request_fn devices.

Testing has proven this niche request-based dm-mq mode to be buggy, when
testing fault tolerance with DM multipath, and there is no point trying
to preserve it.

Should help improve efficiency of pure dm-mq code and make code
maintenance less delicate.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer
2016-02-20 14:02:49 -05:00
parent 818c5f3bef
commit c5248f79f3
2 changed files with 20 additions and 40 deletions
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5
drivers/md/dm-mpath.c
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@@ -418,7 +418,10 @@ static int __multipath_map(struct dm_target *ti, struct request *clone,
spin_unlock_irq(&m->lock);
if (clone) {
/* Old request-based interface: allocated clone is passed in */
/*
* Old request-based interface: allocated clone is passed in.
* Used by: .request_fn stacked on .request_fn path(s).
*/
clone->q = bdev_get_queue(bdev);
clone->rq_disk = bdev->bd_disk;
clone->cmd_flags |= REQ_FAILFAST_TRANSPORT;