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)
commitbe2a2656eef95c32ca73e7a6a8c85671aa92e3f1
treecaea637e7247c0d57d8b1fe0042a5b7a0994ed9c
parenta167f663243662aa9153c01086580a11cde9ffdc
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>
drivers/md/bitmap.c