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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>
67 lines
1.1 KiB
JSON
67 lines
1.1 KiB
JSON
{
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"node-name": "node-a-f",
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"read-only": false,
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"driver": "qcow",
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"file": "node-a-s",
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"backing": "node-b-f"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/a",
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"aio": "threads",
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"node-name": "node-a-s",
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"auto-read-only": true,
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"discard": "unmap"
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}
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{
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"node-name": "node-b-f",
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"read-only": true,
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"driver": "qed",
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"file": "node-b-s",
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"backing": "node-c-f"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/b",
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"aio": "threads",
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"node-name": "node-b-s",
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"auto-read-only": true,
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"discard": "unmap"
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}
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{
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"node-name": "node-c-f",
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"read-only": true,
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"driver": "vmdk",
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"file": "node-c-s",
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"backing": "node-d-f"
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}
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{
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"driver": "gluster",
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"volume": "images",
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"path": "c",
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"server": [
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{
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"type": "inet",
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"host": "test.org",
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"port": "24007"
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}
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],
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"node-name": "node-c-s",
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"auto-read-only": true,
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"discard": "unmap"
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}
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{
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"node-name": "node-d-f",
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"read-only": true,
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"driver": "raw",
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"file": "node-d-s"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/d",
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"aio": "threads",
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"node-name": "node-d-s",
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"auto-read-only": true,
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"discard": "unmap"
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}
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