md: incorporate new plugging into raid5.
commit7c13edc87510f665da3094174e1fd633e06649f4
authorNeilBrown <neilb@suse.de>
Mon, 18 Apr 2011 08:25:43 +0000 (18 18:25 +1000)
committerNeilBrown <neilb@suse.de>
Mon, 18 Apr 2011 08:25:43 +0000 (18 18:25 +1000)
treec0c50ab6ac43e9c762199bfd94c787f43a8e0896
parent97658cdd3af7d01461874c93b89afa4a2465e7c6
md: incorporate new plugging into raid5.

In raid5 plugging is used for 2 things:
 1/ collecting writes that require a bitmap update
 2/ collecting writes in the hope that we can create full
    stripes - or at least more-full.

We now release these different sets of stripes when plug_cnt
is zero.

Also in make_request, we call mddev_check_plug to hopefully increase
plug_cnt, and wake up the thread at the end if plugging wasn't
achieved for some reason.

Signed-off-by: NeilBrown <neilb@suse.de>
drivers/md/raid5.c