md: use new plugging interface for RAID IO.
authorNeilBrown <neilb@suse.de>
Mon, 18 Apr 2011 08:25:41 +0000 (18:25 +1000)
committerNeilBrown <neilb@suse.de>
Mon, 18 Apr 2011 08:25:41 +0000 (18:25 +1000)
md/raid submits a lot of IO from the various raid threads.
So adding start/finish plug calls to those so that some
plugging happens.

Signed-off-by: NeilBrown <neilb@suse.de>

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