block: add dma alignment and padding support to blk_rq_map_kern
authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Fri, 25 Apr 2008 10:47:50 +0000 (12:47 +0200)
committerJens Axboe <jens.axboe@oracle.com>
Tue, 29 Apr 2008 07:50:34 +0000 (09:50 +0200)
commit68154e90c9d1492d570671ae181d9a8f8530da55
tree4b4e9cfbaa587a576e7e52284c53ef99cf69ac4d
parent657e93be356f51888f56a58d2b374caefbf2fe86
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>
block/blk-map.c
fs/bio.c
include/linux/bio.h