linux-ext4 - Re: [PATCH 2/2] e2image: add -a switch to include all data

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Message-ID: <4F3D9CB3.4020704@ubuntu.com>
Date:	Thu, 16 Feb 2012 19:17:55 -0500
From:	Phillip Susi <psusi@...ntu.com>
To:	Ted Ts'o <tytso@....edu>
CC:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/2] e2image: add -a switch to include all data

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On 02/16/2012 06:17 PM, Ted Ts'o wrote:
> As I recall Lukas disclaimed a guarantee that the code would work on
> qcow2 images that weren't generated by e2image.  (In particular, it
> definitely doesn't support compressed or encrypted qcow2 images.)
> 
> So we need to make sure we add the appropriate disclaimers that this
> might not work on qcow2 images generated by tools other than e2image.

Would you care to craft such a disclaimer?

> It will only work for raw images.  The QCOW2 format uses an entirely
> different code path, since we don't have an QCOW2 io_manager
> abstraction.  That was my original hope, but that's not how our qcow2
> support was implemented, so it won't work, and we should probably give
> a reasonable warning if someone tries to use the -a flag with anything
> other than a raw file system image for e2image's input.

It seemed to work fine with qcow2 when I tested it.

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