Re: [Qemu-devel] [PATCH v8 for 2.1 4/4] block: add QAPI command to allow live backing file change

[Kevin Wolf <kwolf@redhat.com>]

Am 01.07.2014 um 09:52 hat Stefan Hajnoczi geschrieben:
> From: Jeff Cody <jcody@redhat.com>
> 
> 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@redhat.com>
> Signed-off-by: Jeff Cody <jcody@redhat.com>
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

Reviewed-by: Kevin Wolf <kwolf@redhat.com>