linux-kernel - Re: [PATCH 06/17] blk-map/bio: use struct iovec instead of sg

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Date:	Thu, 02 Apr 2009 00:32:39 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Boaz Harrosh <bharrosh@...asas.com>
CC:	axboe@...nel.dk, linux-kernel@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH 06/17] blk-map/bio: use struct iovec instead of sg_iovec

Hello,

Boaz Harrosh wrote:
> On 04/01/2009 04:44 PM, Tejun Heo wrote:
>> Impact: cleanup
>>
>> blk-map and bio use sg_iovec for addr-len segments although there
>> isn't anything sg-specific about the API.  This is mostly due to
>> historical reasons.  sg_iovec is by definition identical to iovec.
>> Use iovec instead.  This removes bogus dependency on scsi sg and will
>> allow use of iovec helpers.
>>
>> Signed-off-by: Tejun Heo <tj@...nel.org>
>> ---
>>  block/blk-map.c        |    5 ++---
>>  block/scsi_ioctl.c     |    8 +++-----
>>  fs/bio.c               |   23 +++++++++++------------
>>  include/linux/bio.h    |    6 +++---
>>  include/linux/blkdev.h |    8 ++++----
>>  5 files changed, 23 insertions(+), 27 deletions(-)
>>
> 
> OK, The actual one user in sg.c passes a void*, so no casts are
> needed. (I couldn't find where are the type-casts of old users)
> 
> Should we make this a part of a bigger cleanup that removes
> sg_iovec, from Kernel altogether and only makes a #define for
> user-mode?
> 
> BTW: 
>     user-mode scsi/sg.h does not come from the Kernels exported
>     headers. It comes with the gcc distribution.
>     If we remove it alltogether it will not affect anybody.
> 
> If you want I can help with this little chore?

Sure, that would be a nice cleanup.  If dropping sg_iovec doesn't
affect userland, I think it would better to just drop it.

Thanks.

-- 
tejun
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