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block: add blk_rq_aligned helper function
authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Thu, 28 Aug 2008 06:05:58 +0000 (15:05 +0900)
committerJens Axboe <jens.axboe@oracle.com>
Thu, 9 Oct 2008 06:56:11 +0000 (08:56 +0200)
This adds blk_rq_aligned helper function to see if alignment and
padding requirement is satisfied for DMA transfer. This also converts
blk_rq_map_kern and __blk_rq_map_user to use the helper function.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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