linux-kernel - Re: [PATCH 6/7] blk_end_request: remove/unexport end_that_request

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Message-ID: <46DE5C90.2020700@panasas.com>
Date:	Wed, 05 Sep 2007 10:36:48 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Kiyoshi Ueda <k-ueda@...jp.nec.com>, jens.axboe@...cle.com
CC:	bhalevy@...asas.com, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	mike.miller@...com, grant.likely@...retlab.ca, dm-devel@...hat.com,
	j-nomura@...jp.nec.com
Subject: Re: [PATCH 6/7] blk_end_request: remove/unexport end_that_request_*

On Wed, Sep 05 2007 at 2:13 +0300, Kiyoshi Ueda <k-ueda@...jp.nec.com> wrote:
> Hi,
> 
> On Tue, 4 Sep 2007 17:25:14 -0400, "Halevy, Benny" <bhalevy@...asas.com> wrote:
>> We suspect we'll still need the extern entry points for handling the bidi 
>> request in the scsi_io_completion() path as we only want to call
>> end_that_request_chunk on req->next_rq and never
>> end_that_request_last.
>>  
>> (see 
>> http://www.bhalevy.com/open-osd/download/linux-2.6.23-rc2_and_iscsi-iscsi-2007_08_09/0005-SCSI-bidi-support.patch)
> 
> If this patch-set is merged, there may be other way to do that.
> 
> For tricky drivers, special interface, blk_end_request_callback(),
> is added in the patch 5/7.
> (http://marc.info/?l=linux-kernel&m=118860027714753&w=2)
> Currently, only user of the interface is ide-cd (cdrom_newpc_intr()).
> It needs to call only end_that_request_first() too.
> 
> With the patch 7/7, you can set your own handler in rq->end_io()
> to complete the request by your own way.
> 
> Thanks,
> Kiyoshi Ueda

That will not work, as I will have no means of releasing the BIOs of
the bidi request, which can not use end_request().

I guess as Jens said it's OK to remove them now, and later we can
just add end_that_request_first(), will be enough.
Or we can patch end_request() to also call 
__end_that_request_first(req->next_rq) if not NULL.

Jens which method do you prefer? I will adjust my patches accordingly.

Thanks
Boaz Harrosh

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