linux-kernel - Re: [PATCH] [BSG]: Add support for struct sg_io_v4->d[out,in]_iovec

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Date:	Mon, 14 Jun 2010 15:22:49 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	nab@...ux-iscsi.org
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	jaxboe@...ionio.com, James.Bottomley@...e.de, hch@....de,
	fujita.tomonori@....ntt.co.jp, michaelc@...wisc.edu, hare@...e.de
Subject: Re: [PATCH] [BSG]: Add support for struct
 sg_io_v4->d[out,in]_iovec_count

On Sun, 13 Jun 2010 23:11:29 -0700
"Nicholas A. Bellinger" <nab@...ux-iscsi.org> wrote:

> From: Nicholas Bellinger <nab@...ux-iscsi.org>
> 
> Greetings Jens and co,
> 
> This patch adds the missing support to block/bsg.c:bsg_map_hdr() to accept
> struct sg_io_v4->d[out,in]_iovec_count and process struct sg_io_v4->d[out,in]_xferp memory
> containing userspace iovecs for kernel level BSG.  It adds a new wrapper bsg_rq_map_user_iov()
> that will call copy_from_user() and blk_rq_map_user_iov() following the original SG_IO logic in
> drivers/scsi/sg.c:sg_start_req().
> 
> So far this has been tested on a x86_64 v2.6.34 KVM Host with TCM_Loop Virtual SAS Port/LUNs
> into a x86_64 v2.6.26 KVM Guest with Megasas 8707EM2 HBA Emulation + my new scsi-bsg backstore code.
> 
> Please consider this for v2.6.36 as it will be required in order for QEMU-KVM MegaSAS and VirtIO HBA
> emulation using QEMU scatterlist memory and BSG backstores.
> 
> Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
> ---
>  block/bsg.c |   55 +++++++++++++++++++++++++++++++++++++++++++++++--------
>  1 files changed, 47 insertions(+), 8 deletions(-)

This have been rejected several times.

This doesn't work on 32bit user/64bit kernel.

The compat code doesn't work for the read/write interface (does for
the ioctl interface though). So we can't support this feature cleanly.
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