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Re: [Qemu-devel] [PATCH V3 2/7] qemu-nbd: support internal snapshot expo
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH V3 2/7] qemu-nbd: support internal snapshot export |
Date: |
Tue, 01 Oct 2013 08:45:57 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9 |
On 09/25/2013 06:16 PM, Wenchao Xia wrote:
> Now it is possible to directly export an internal snapshot, which
> can be used to probe the snapshot's contents without qemu-img
> convert.
>
> Signed-off-by: Wenchao Xia <address@hidden>
> ---
> block/snapshot.c | 18 ++++++++++++++++++
> include/block/snapshot.h | 6 ++++++
> qemu-nbd.c | 35 ++++++++++++++++++++++++++++++++++-
> 3 files changed, 58 insertions(+), 1 deletions(-)
Woo-hoo! Long desired. It would be even cooler if we could set up the
export directly from a running qemu instance, rather than having to
spawn an external qemu-nbd process (after all, we've already documented
that having more than one process directly using the same qcow2 file is
not safe), but this is a step in the right direction.
> @@ -328,6 +331,8 @@ int main(int argc, char **argv)
> { "connect", 1, NULL, 'c' },
> { "disconnect", 0, NULL, 'd' },
> { "snapshot", 0, NULL, 's' },
> + { "load-snapshot", 1, NULL, 'l' },
> + { "load-snapshot1", 1, NULL, 'L' },
Uggh. This makes getopt_long's unambiguous-prefix handling very hard to
use. For example, --dis is recognized as short for --disconnect; but
here --load is NOT short for --load-snapshot, because it could also be
short for --load-snapshot1. And why the 1 suffix? Can you come up with
a better name that distinguishes why you have to have two different long
options, and which doesn't overlap on as much of a common prefix?
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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