md/raid5: add simple plugging infrastructure.

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md/raid5 uses the plugging infrastructure provided by the block layer
and 'struct request_queue'.  However when we plug raid5 under dm there
is no request queue so we cannot use that.

So create a similar infrastructure that is much lighter weight and use
it for raid5.

Signed-off-by: NeilBrown <neilb@suse.de>

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This commit is contained in:

NeilBrown 2010-06-01 19:37:29 +10:00

parent 11d8a6e371

commit 2ac8740151

4 changed files with 93 additions and 14 deletions

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45

drivers/md/md.c

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20

drivers/md/md.h

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39

drivers/md/raid5.c

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3

drivers/md/raid5.h

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