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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>
65 lines
1.0 KiB
JSON
65 lines
1.0 KiB
JSON
{
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"node-name": "node-b-f",
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"read-only": false,
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"cache": {
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"direct": false,
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"no-flush": true
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},
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"driver": "qcow2",
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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": "rbd",
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"pool": "rbdpool",
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"image": "rbdimg",
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"server": [
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{
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"host": "host1.example.com",
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"port": "0"
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},
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{
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"host": "host2.example.com",
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"port": "0"
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}
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],
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"user": "testuser-rbd",
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"auth-client-required": [
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"cephx",
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"none"
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],
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"key-secret": "node-a-s-secalias",
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"node-name": "node-a-s",
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"cache": {
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"direct": false,
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"no-flush": true
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},
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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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"cache": {
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"direct": false,
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"no-flush": true
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},
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"driver": "qcow2",
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"file": "node-b-s",
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"backing": null
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}
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{
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"driver": "iscsi",
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"portal": "example.org:3260",
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"target": "iscsitarget",
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"lun": 1,
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"transport": "tcp",
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"node-name": "node-b-s",
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"cache": {
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"direct": false,
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"no-flush": true
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},
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"auto-read-only": true,
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"discard": "unmap"
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}
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