linux-kernel - Re: [patch 6/7] SCSI: save disk in scsi_device

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Date:	Fri, 04 May 2007 15:30:48 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Cc:	jeff@...zik.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	htejun@...il.com, akpm@...ux-foundation.org
Subject: Re: [patch 6/7] SCSI: save disk in scsi_device - resend

On Fri, 2007-05-04 at 11:17 -0700, Kristen Carlson Accardi wrote:
> Give anyone who has access to scsi_device access to the genhd struct as well.
> 
> Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@...el.com>
> Index: 2.6-git/drivers/scsi/sd.c
> ===================================================================
> --- 2.6-git.orig/drivers/scsi/sd.c
> +++ 2.6-git/drivers/scsi/sd.c
> @@ -1711,6 +1711,7 @@ static int sd_probe(struct device *dev)
>  
>  	dev_set_drvdata(dev, sdkp);
>  	add_disk(gd);
> +	sdp->disk = gd;
>  
>  	sdev_printk(KERN_NOTICE, sdp, "Attached scsi %sdisk %s\n",
>  		    sdp->removable ? "removable " : "", gd->disk_name);
> Index: 2.6-git/drivers/scsi/sr.c
> ===================================================================
> --- 2.6-git.orig/drivers/scsi/sr.c
> +++ 2.6-git/drivers/scsi/sr.c
> @@ -604,6 +604,7 @@ static int sr_probe(struct device *dev)
>  	if (sdev->media_change_notify)
>  		disk->flags |= GENHD_FL_MEDIA_CHANGE_NOTIFY;
>  	add_disk(disk);
> +	sdev->disk = disk;
>  
>  	sdev_printk(KERN_DEBUG, sdev,
>  		    "Attached scsi CD-ROM %s\n", cd->cdi.name);
> Index: 2.6-git/include/scsi/scsi_device.h
> ===================================================================
> --- 2.6-git.orig/include/scsi/scsi_device.h
> +++ 2.6-git/include/scsi/scsi_device.h
> @@ -138,7 +138,7 @@ struct scsi_device {
>  
>  	struct device		sdev_gendev;
>  	struct class_device	sdev_classdev;
> -
> +	struct gendisk 		*disk;
>  	struct execute_work	ew; /* used to get process context on put */
>  
>  	enum scsi_device_state sdev_state;

If you're going to do this, you need to take on board removing the
struct gendisk from all the ULD structures (since it's now become
generic).

James


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