* [Qemu-devel] qcow2: snapshot and resize possible?
@ 2011-09-13 9:41 Frediano Ziglio
2011-09-13 9:51 ` Kevin Wolf
0 siblings, 1 reply; 2+ messages in thread
From: Frediano Ziglio @ 2011-09-13 9:41 UTC (permalink / raw)
To: Kevin Wolf; +Cc: qemu-devel
Looking at block TODOs I saw qcow2 resize with snapshot. However I
would ask if this is technical possible with current format. The
reason is that snapshots have no size (only l1_size, QCowHeader have a
size field) however I think that size if part of machine state and is
not possible to compute exact size from l1_size.
Should this resize be posted to qcow3 update?
Frediano
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] qcow2: snapshot and resize possible?
2011-09-13 9:41 [Qemu-devel] qcow2: snapshot and resize possible? Frediano Ziglio
@ 2011-09-13 9:51 ` Kevin Wolf
0 siblings, 0 replies; 2+ messages in thread
From: Kevin Wolf @ 2011-09-13 9:51 UTC (permalink / raw)
To: Frediano Ziglio; +Cc: qemu-devel
Am 13.09.2011 11:41, schrieb Frediano Ziglio:
> Looking at block TODOs I saw qcow2 resize with snapshot. However I
> would ask if this is technical possible with current format. The
> reason is that snapshots have no size (only l1_size, QCowHeader have a
> size field) however I think that size if part of machine state and is
> not possible to compute exact size from l1_size.
> Should this resize be posted to qcow3 update?
Yes, I think it would require a format change. Maybe we should add a
field for the image size to the qcow2 v3 proposal.
Kevin
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-09-13 9:41 [Qemu-devel] qcow2: snapshot and resize possible? Frediano Ziglio
2011-09-13 9:51 ` Kevin Wolf
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