b@suse.de> 1288154261 +1100
committer NeilBrown <neilb@suse.de> 1288330832 +1100

md: unplug writes to external bitmaps.

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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