linux-kernel - Re: [PATCH 2/3] scsi: add scsi_device->alt

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Message-Id: <1241842999.6357.2.camel@mulgrave>
Date:	Fri, 08 May 2009 23:23:19 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	jeff@...zik.org, linux-ide@...r.kernel.org, jens.axboe@...cle.com,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	Mauelshagen@...Hat.com, dm-devel@...Hat.com,
	dan.j.williams@...il.com
Subject: Re: [PATCH 2/3] scsi: add scsi_device->alt_capacity

On Sat, 2009-05-09 at 09:13 +0900, Tejun Heo wrote:
> Add scsi_device->alt_capacity and let sd pass it over to genhd.  This
> is to allow SCSI low level drivers to configure alt_capacity via
> slave_configure().
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Jens Axboe <jens.axboe@...cle.com>
> Cc: Dan Williams <dan.j.williams@...il.com>
> Cc: Jeff Garzik <jeff@...zik.org>
> Cc: James Bottomley <James.Bottomley@...senPartnership.com>
> ---
>  drivers/scsi/sd.c          |    1 +
>  include/scsi/scsi_device.h |    1 +
>  2 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 3fcb64b..f3448bf 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -1839,6 +1839,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
>  	blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
>  
>  	set_capacity(disk, sdkp->capacity);
> +	set_alt_capacity(disk, sdp->alt_capacity);
>  	kfree(buffer);
>  
>   out:
> diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
> index 3f566af..b24fdeb 100644
> --- a/include/scsi/scsi_device.h
> +++ b/include/scsi/scsi_device.h
> @@ -92,6 +92,7 @@ struct scsi_device {
>  	unsigned int manufacturer;	/* Manufacturer of device, for using 
>  					 * vendor-specific cmd's */
>  	unsigned sector_size;	/* size in bytes */
> +	size_t alt_capacity;	/* alternative capacity, used by sd */
>  
>  	void *hostdata;		/* available to low-level driver */
>  	char type;

This is done at slightly the wrong level.  Capacity is actually a
property of struct scsi_disk not struct scsi_device ... shouldn't
alt_capacity be at the same level?

James


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