md: unplug writes to external bitmaps.
authorNeilBrown <neilb@suse.de>
Wed, 27 Oct 2010 04:37:41 +0000 (15:37 +1100)
committerNeilBrown <neilb@suse.de>
Fri, 29 Oct 2010 05:40:32 +0000 (16:40 +1100)
When writing to an 'external' bitmap we don't currently unplug the
device before waiting, so we can get a 3msec delay each time;
So use REQ_UNPLUG to force and unplug.

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

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