linux-kernel - Re: [PATCH] ide-cd: document capacity hack

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Message-Id: <200902182138.15501.bzolnier@gmail.com>
Date:	Wed, 18 Feb 2009 21:38:14 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Borislav Petkov <petkovbb@...il.com>
Subject: Re: [PATCH] ide-cd: document capacity hack

On Wednesday 18 February 2009, Sergei Shtylyov wrote:
> Hello.
> 
> Bartlomiej Zolnierkiewicz wrote:
> 
> > Just copy the comment from drivers/scsi/sr.c::sr_done()
> > (from which the capacity hack has been originated).
> 
> > Cc: Borislav Petkov <petkovbb@...il.com>
> > Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> 
> Acked-by: Sergei Shtylyov <sshtylyov@...mvista.com>
> 
> > Index: b/drivers/ide/ide-cd.c
> > ===================================================================
> > --- a/drivers/ide/ide-cd.c
> > +++ b/drivers/ide/ide-cd.c
> > @@ -189,6 +189,14 @@ static void cdrom_analyze_sense_data(ide
> >  			bio_sectors = max(bio_sectors(failed_command->bio), 4U);
> >  			sector &= ~(bio_sectors - 1);
> >  
> > +			/*
> > +			 * The SCSI specification allows for the value
> > +			 * returned by READ CAPACITY to be up to 75 2K
> > +			 * sectors past the last readable block.
> 
>     Oh horror... :-)
> 
> > +			 * Therefore, if we hit a medium error within the
> > +			 * last 75 2K sectors, we decrease the saved size
> > +			 * value.
> > +			 */
> >  			if (sector < get_capacity(info->disk) &&
> >  			    drive->probed_capacity - sector < 4 * 75)
> >  				set_capacity(info->disk, sector);
> 
>     Would be nice if the CHS capacity workround was finally documented too? ;-)

Send patches.  I have my hands full of work...
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