dm: remove support for stacking dm-mq on .request_fn device(s)
authorMike Snitzer <snitzer@redhat.com>
Sat, 20 Feb 2016 19:02:49 +0000 (14:02 -0500)
committerMike Snitzer <snitzer@redhat.com>
Tue, 23 Feb 2016 03:33:46 +0000 (22:33 -0500)
commitc5248f79f39e5254977a3916b2149c3ccffa2722
treebd8a3e1663a3596d88461be3a731ac060f65e345
parent818c5f3bef750eb5998b468f84391e4d656b97ed
dm: remove support for stacking dm-mq on .request_fn device(s)

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>
drivers/md/dm-mpath.c
drivers/md/dm.c