linux-kernel - Re: [PATCH v2] block: avoid false positive warnings on ioctl to partition

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Message-ID: <4F4E97EE.2090706@redhat.com>
Date:	Wed, 29 Feb 2012 22:26:06 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Ray Lee <ray-lk@...rabbit.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	stable@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH v2] block: avoid false positive warnings on ioctl to partition

Il 29/02/2012 20:56, Ray Lee ha scritto:
> On Wed, Feb 29, 2012 at 12:13 AM, Paolo Bonzini <pbonzini@...hat.com> wrote:
>>
>> Il 29/02/2012 01:14, Linus Torvalds ha scritto:
>>> So I'm still not convinced this is safe, and feel a bit worried about
>>> us possibly silently missing some things. That
>>>
>>>    default:
>>>       return -ENOIOCTLCMD;
>>>
>>> is what worries me.
>>>
>>> Blocking the ones we *know* about and understand I'm perfectly fine
>>> with. And the SG_IO case looks fine. It's the possibly unknown users
>>> that still worry me.
>>
>> I understand.
>>
>> But being 100% sure that nothing breaks is
>> impossible, unfortunately, so does it make sense to aim at 100%?  And it
>> should be extremely easy to bisect failures.  Even with all the
>> differences, it reminds me of the recent change to poll.
> 
> You can help avoid the bisect entirely by silently dropping the ones
> you're sure about, and noisily dropping the ones you aren't.

It's not so easy, see http://permalink.gmane.org/gmane.linux.kernel/1244476.

Paolo
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