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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>
23 lines
353 B
JSON
23 lines
353 B
JSON
{
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"node-name": "test1",
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"read-only": false,
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"cache": {
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"direct": true,
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"no-flush": false
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},
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"driver": "raw",
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"file": "test2"
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}
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{
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"driver": "file",
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"filename": "/path/to/i.img",
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"aio": "native",
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"node-name": "test2",
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"cache": {
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"direct": true,
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"no-flush": false
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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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