linux-kernel - Re: ide_cd modifies hard

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Date:	Tue, 18 Mar 2008 12:22:02 +0100
From:	"Boris Petkov" <petkovbb@...glemail.com>
To:	"Jens Axboe" <jens.axboe@...cle.com>
Cc:	"Nikanth Karthikesan" <knikanth@...e.de>,
	"Bartlomiej Zolnierkiewicz" <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: ide_cd modifies hard_* members of request

On Tue, Mar 18, 2008 at 12:08 PM, Jens Axboe <jens.axboe@...cle.com> wrote:
>
> On Tue, Mar 18 2008, Boris Petkov wrote:
>  > (sorry, forgot to cc all)
>  >
>  > On Tue, Mar 18, 2008 at 9:54 AM, Nikanth Karthikesan <knikanth@...e.de> wrote:
>  > > Hi
>  > >
>  > >  Despite the warning in blkdev.h, that members of struct request starting
>  > >  with hard_* are block layer internals, and no driver should touch them,
>  > >  the ide_cd driver seems to fiddle around with it.
>  > >
>  > >  Is this reqd, or can this be made to work without the need for this?
>  > >
>  > >  If this reqd, why not provide a helper function for that in block layer
>  > >  itself, may be, with a warning about usage?
>  > >
>  > >  Thanks
>  > >  Nikanth Karthikesan
>  >
>  > Hi,
>  >
>  > the code pieces you're referring to are in there since at least the
>  > first git import of the kernel source (i.e. 2005) aka long time so
>  > Bart/Jens should know that...
>
>  restore_request(), I'm assuming. It was probably me who modified this
>  code, I don't think there's any justification for it. I would suggest
>  killing it.

I'll conjure up something later wrt above.

> And cdrom_read_from_buffer() as well, it's a silly addition.

This one is already gone, however the patch is still in Bart's tree
for -mm testing:
ftp://ftp.fi.kernel.org/pub/linux/kernel/people/bart/pata-2.6/patches/ide-cd-remove-the-internal-64k-buffer.patch

>
>  --
>  Jens Axboe
>
>



-- 
Regards/Gruß,
Boris
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