null_blk: documentation

Add description of module and its parameters.

Signed-off-by: Matias Bjorling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Matias Bjorling 2013-12-18 13:41:42 +01:00 • committed by Jens Axboe
commit 12f8f4fc03