md: incorporate new plugging into raid5.

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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>

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This commit is contained in:

NeilBrown 2011-04-18 18:25:43 +10:00

parent 97658cdd3a

commit 7c13edc875

1 changed files with 16 additions and 7 deletions

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drivers/md/raid5.c

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