linux-kernel - Re: [RFC/GIT PULL] Linux KVM tool for v3.2

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Message-ID: <m3ipmspaug.fsf@blackfin.pond.sub.org>
Date:	Thu, 10 Nov 2011 10:48:07 +0100
From:	Markus Armbruster <armbru@...hat.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [RFC/GIT PULL] Linux KVM tool for v3.2

Sasha Levin <levinsasha928@...il.com> writes:

> On Thu, Nov 10, 2011 at 10:57 AM, Markus Armbruster <armbru@...hat.com> wrote:
>> Sasha Levin <levinsasha928@...il.com> writes:
[...]
>>> I'm actually not sure why KVM tool got QCOW support in the first
>>> place. You can have anything QCOW provides if you use btrfs (among
>>> several other FSs).
>>
>> Maybe it's just me, but isn't it weird to have a filesystem (QCOW2)
>> sitting in the kernel sources that you can't mount(2)?
>>
>
> It's not really a filesystem, it's a disk image :)

Sloppy language on my part, sorry about that.

It's a transport for blocks.  We have a few of those in the kernel
already: block devices.  Including loop devices and DRBD.  You use a
filesystem to interpret their contents.  The resulting stack is what
gets mounted.  Adding another transport for blocks to the kernel that
cannot be used that way strikes me as weird.

[...]
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