linux-kernel - Re: [PATCH 0/7] sg_ring: a ring of scatterlist arrays

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Message-ID: <4781E6BB.2010900@gmail.com>
Date:	Mon, 07 Jan 2008 17:45:47 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH 0/7] sg_ring: a ring of scatterlist arrays

Rusty Russell wrote:
> On Monday 07 January 2008 17:37:41 Tejun Heo wrote:
>> Rusty Russell wrote:
>>> Hi Tejun,
>>>
>>>    Nice try!  Even ignoring the ugliness of undoing such an operation if
>>> the caller doesn't expect you to mangle their chains, consider a
>>> one-element sg array. :(
>> Heh heh, that can be dealt with by skipping the first chain if the first
>> chain is empty after chaining.  Please take a look at
>> ata_sg_setup_extra() in the following.
>>
>> http://git.kernel.org/?p=linux/kernel/git/tj/libata-dev.git;a=blob;f=driver
>> s/ata/libata-core.c;h=32dde5bbc75ed53e89ac17040da2cd0621a37161;hb=c8847e473a
>> 4a2844244784226eb362be10d52ce9
>>
>> That said, yeah, it's seriously ugly.  Restoring the original sg is ugly
>> too.  I definitely agree that we need some improvements here.
> 
> Erk, that's beyond ugly, into actual evil.

/me agrees.

> To make this general you need to find the last N 1-element chains (but SCSI 
> doesn't do this of course).  Oh the horror...

/me agrees.

> I'd be remiss if I didn't mention that the sg_ring ata patches were 
> straightforward, and indescribably beautiful if compared to this!

/me agrees.  As long as this can be made sane using one unified
interface, I don't care whether it's sg_ring, table or dish.

Thanks.

-- 
tejun
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