bsg: add sg_io_v4 structure

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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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FUJITA Tomonori 2006-12-20 11:19:32 +01:00 • committed by Jens Axboe

parent 337ad41dea

commit 45977d0e87

1 changed files with 43 additions and 0 deletions

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include/linux/bsg.h

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