NeilBrown be2a2656ee 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>

2010-10-29 16:40:32 +11:00

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