From: Jens Axboe <jens.axboe@xxxxxxxxxx>
Subject: Re: [PATCH 4/6] bsg: add sg_io_v4 structure
Date: Wed, 20 Dec 2006 11:13:14 +0100
> 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.
I see though we need to use __u32 instead of u32, don't we?
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