linux-kernel - Re: [PATCH 14/17] scsi: replace custom rq mapping with blk_rq_map_kern

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Message-ID: <49D3A191.2040000@panasas.com>
Date:	Wed, 01 Apr 2009 20:17:05 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Tejun Heo <tj@...nel.org>, linux-scsi <linux-scsi@...r.kernel.org>,
	axboe@...nel.dk, linux-kernel@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH 14/17] scsi: replace custom rq mapping with	blk_rq_map_kern_sgl()

On 04/01/2009 08:05 PM, James Bottomley wrote:
> On Wed, 2009-04-01 at 20:00 +0300, Boaz Harrosh wrote:
>> On 04/01/2009 04:44 PM, Tejun Heo wrote:
>>> Impact: hack removal
>>>
>>> SCSI needs to map sgl into rq for kernel PC requests; however, block
>>> API didn't have such feature so it used its own rq mapping function
>>> which hooked into block/bio internals and is generally considered an
>>> ugly hack.  The private function may also produce requests which are
>>> bigger than queue per-rq limits.
>>>
>>> Block blk_rq_map_kern_sgl().  Kill the private implementation and use
>>> it.
>>>
>>> Signed-off-by: Tejun Heo <tj@...nel.org>
>> James, TOMO
>>
>> what happened to Tomo's patches that removes all this after fixing up
>> all users (sg.c)?
>>
>> I thought that was agreed and done? What is left to do for that to go
>> in.
> 
> They couldn't go in because they would break libosd.  You were going to
> send patches to fix libosd so it no longer relied on the exported
> function ... did that happen and I missed it?
> 

That's not related. I'm asking about the scsi ULD patches and finally the
patch to scsi_lib.c. libosd only conflicts with the very last patch to block
layer. I don't see how that prevents the cleanups to scsi?

And BTW, I did send RFC patches that removes usage of blk_rq_append_bio() and
did not receive any comments

> James
> 
> 

Boaz
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