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authorFUJITA Tomonori <tomof@acm.org>2006-12-20 11:19:32 +0100
committerJens Axboe <jens.axboe@oracle.com>2007-07-16 08:52:44 +0200
commit45977d0e87ac988d04fccfb89221727aaf8d78a4 (patch)
treef3020ef3f6562e77ae8d70c43f175d713a98da6c /block/bsg.c
parent337ad41deae1b56e56731246322a93251df86e79 (diff)
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op-kernel-dev-45977d0e87ac988d04fccfb89221727aaf8d78a4.tar.gz
bsg: add sg_io_v4 structure
This patch adds sg_io_v4 structure that Doug proposed last month. There's one major change from the RFC. I dropped iovec, which needs compat stuff. The bsg code simply calls blk_rq_map_user against dout_xferp/din_xferp. So if possible, the page frames are directly mapped. If not possible, the block layer allocates new page frames and does memory copies. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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