From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Fri, 25 Apr 2008 10:47:50 +0000 (+0200)
Subject: block: add dma alignment and padding support to blk_rq_map_kern
X-Git-Tag: v2.6.26-rc1~372^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=68154e90c9d1492d570671ae181d9a8f8530da55;p=pandora-kernel.git

block: add dma alignment and padding support to blk_rq_map_kern

This patch adds bio_copy_kern similar to
bio_copy_user. blk_rq_map_kern uses bio_copy_kern instead of
bio_map_kern if necessary.

bio_copy_kern uses temporary pages and the bi_end_io callback frees
these pages. bio_copy_kern saves the original kernel buffer at
bio->bi_private it doesn't use something like struct bio_map_data to
store the information about the caller.

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

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