On Wed, Dec 20 2006, FUJITA Tomonori wrote:
> 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@xxxxxxxxxxxxx>
> ---
> include/linux/bsg.h | 43 +++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 43 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/bsg.h b/include/linux/bsg.h
> index dc0d728..0d212cc 100644
> --- a/include/linux/bsg.h
> +++ b/include/linux/bsg.h
> @@ -1,6 +1,47 @@
> #ifndef BSG_H
> #define BSG_H
>
> +struct sg_io_v4 {
> + int32_t guard; /* [i] 'Q' to differentiate from v3 */
> + uint32_t protocol; /* [i] 0 -> SCSI , .... */
I prefer using the u32 types and so on for explicitly sized variables.
I'll make that change.
--
Jens Axboe
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