mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-12-27 07:22:07 +03:00
2c4c347c4b
To allow using -blockdev with blockjobs QEMU needs to reopen files in read-write mode when modifying the backing chain. To achieve this we need to use 'auto-read-only' for the backing files rather than the normal 'read-only' property. That way qemu knows that the files need to be reopened. Note that the format drivers (e.g. qcow2) are still opened with the read-only property enabled when being a member of the backing chain since they are supposed to be immutable unless a block job is started. QEMU v4.0 (since commit 23dece19da4) allows also dynamic behaviour for auto-read-only which allows us to use sVirt as we only grant write permissions to files when doing a blockjob. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
14 lines
216 B
JSON
14 lines
216 B
JSON
{
|
|
"node-name": "test1",
|
|
"read-only": false,
|
|
"driver": "bochs",
|
|
"file": "test2"
|
|
}
|
|
{
|
|
"driver": "file",
|
|
"filename": "/path/to/i.img",
|
|
"node-name": "test2",
|
|
"auto-read-only": true,
|
|
"discard": "unmap"
|
|
}
|