linux-kernel - Re: [PATCH 2 of 5] xn/blkfront: Add the CDROM_GET

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Date:	Sat, 31 May 2008 08:08:01 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jeff Garzik <jgarzik@...ox.com>
CC:	Jens Axboe <jens.axboe@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2 of 5] xn/blkfront: Add the CDROM_GET_CAPABILITY ioctl
 to	blkfront

Jeff Garzik wrote:
> Jeremy Fitzhardinge wrote:
>> +    case CDROM_GET_CAPABILITY: {
>> +        struct gendisk *gd = info->gd;
>> +        if (gd->flags & GENHD_FL_CD)
>> +            return 0;
>> +        return -EINVAL;
>> +    }
>
>
> Surely you can come up with a better implementation than this?  It's 
> just a bitmask returned to userspace...

Unfortunately the Xen block driver interface doesn't seem to pass 
through any capabilities of the underlying CDROM device, so there's not 
much to return.  I suspect this is primarily a hack to make installers a 
bit happier installing off a Xen VBD rather than because real programs 
will use this in earnest.

    J
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