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Date: Tue, 16 Jul 2013 11:31:34 +0800
From: Stefan Hajnoczi <stefanha@gmail.com>
Message-ID: <20130716033134.GA10106@stefanha-thinkpad.redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 12/17] qemu-img: add a "map" subcommand
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: kwolf@redhat.com, pl@kamp.de, qemu-devel@nongnu.org, stefanha@redhat.com

On Wed, Jul 03, 2013 at 04:34:26PM +0200, Paolo Bonzini wrote:
> +        if ((ret & BDRV_BLOCK_DATA) &&
> +            !(ret & BDRV_BLOCK_OFFSET_VALID)) {
> +            error_report("File contains external or compressed clusters.");

What does "external clusters" mean?  Did you mean encrypted?