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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>
141 lines
2.8 KiB
JSON
141 lines
2.8 KiB
JSON
{
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"node-name": "#block126",
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"read-only": false,
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"driver": "qcow2",
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"file": "#block004",
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"backing": "#block313"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.1507297895",
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"node-name": "#block004",
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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": "#block313",
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"read-only": true,
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"driver": "qcow2",
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"file": "#block256",
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"backing": "#block556"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.1484071872",
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"node-name": "#block256",
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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": "#block556",
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"read-only": true,
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"driver": "qcow2",
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"file": "#block418",
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"backing": "#block767"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.1483615252",
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"node-name": "#block418",
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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": "#block767",
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"read-only": true,
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"driver": "qcow2",
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"file": "#block624",
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"backing": "#block937"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.1483605924",
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"node-name": "#block624",
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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": "#block937",
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"read-only": true,
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"driver": "qcow2",
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"file": "#block869",
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"backing": "#block1157"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.1483605920",
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"node-name": "#block869",
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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": "#block1157",
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"read-only": true,
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"driver": "qcow2",
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"file": "#block1047",
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"backing": "#block1392"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.1483546244",
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"node-name": "#block1047",
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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": "#block1392",
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"read-only": true,
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"driver": "qcow2",
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"file": "#block1279",
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"backing": "#block1523"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.1483545901",
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"node-name": "#block1279",
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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": "#block1523",
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"read-only": true,
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"driver": "qcow2",
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"file": "#block1444",
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"backing": "#block1742"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.1483545313",
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"node-name": "#block1444",
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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": "#block1742",
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"read-only": true,
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"driver": "qcow2",
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"file": "#block1602",
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"backing": "#block1909"
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.1483536402",
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"node-name": "#block1602",
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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": "#block1909",
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"read-only": true,
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"driver": "qcow2",
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"file": "#block1864",
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"backing": null
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}
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{
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"driver": "file",
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"filename": "/var/lib/libvirt/images/rhel7.3.qcow2",
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"node-name": "#block1864",
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"auto-read-only": true,
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"discard": "unmap"
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}
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