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>

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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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55

drivers/md/dm.c

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