linux-kernel - Re: [PATCH] block: drop "sending ioctl to a partition" message

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Date:   Thu, 21 Sep 2017 16:59:42 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: Re: [PATCH] block: drop "sending ioctl to a partition" message

On 21/09/2017 16:53, Christoph Hellwig wrote:
> This looks ok to me, but do we even need to keep the special
> cases above?  Is there anything relying on the safe but not very
> useful ioctls?

No idea, I stuck to the usual "don't break userspace" rule.

Honestly I doubt anything is using most of those ioctls _in general_,
not just on a partition.

Paolo

> Condensing the thing down to:
> 
> int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
> {
> 	if (bd && bd == bd->bd_contains)
> 		return 0;
> 	if (capable(CAP_SYS_RAWIO))
> 		return 0;
> 	return -ENOIOCTLCMD;
> }
> 
> would certainly be nice.