On 06/26/2014 07:36 AM, Peter Krempa wrote:
> This command allows to change the backing file name recorded in the
> metadata of a qcow (or other) image. The capability also notifies that
> the "block-stream" and "block-commit" commands understand the
> "backing-file" attribute.
> ---
> src/qemu/qemu_capabilities.c | 2 ++
> src/qemu/qemu_capabilities.h | 1 +
> 2 files changed, 3 insertions(+)
Upstream qemu.git (and therefore qemu.git) now has everything we need
for this; but I'd still rather wait until after the 1.2.6 release (in
part so that the active-commit stuff can go in first, to minimize rebase
churn):
commit fa40e65622352012dccd435147f28161375a6815
Author: Jeff Cody <jcody@xxxxxxxxxx>
Date: Tue Jul 1 09:52:16 2014 +0200
block: add QAPI command to allow live backing file change
This allows a user to make a live change to the backing file recorded in
an open image.
The image file to modify can be specified 2 ways:
1) image filename
2) image node-name
Note: this does not cause the backing file itself to be reopened; it
merely changes the backing filename in the image file structure, and
in internal BDS structures.
It is the responsibility of the user to pass a filename string that
can be resolved when the image chain is reopened, and the filename
string is not validated.
A good analogy for this command is that it is a live version of
'qemu-img rebase -u', with respect to changing the backing file string.
[Jeff is offline so I respun this patch in his absence. Dropped image
filename since using node-name is preferred and this is a new command.
No need to introduce the limitations of finding images by filename.
--Stefan]
Reviewed-by: Eric Blake <eblake@xxxxxxxxxx>
Reviewed-by: Kevin Wolf <kwolf@xxxxxxxxxx>
Signed-off-by: Jeff Cody <jcody@xxxxxxxxxx>
Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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