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QCOW2 v3 autoclear_features field contains bits for features whose metadata becomes invalid when the image is modified by software that doesn't understand them. Defined bits: - Bit 0: Bitmaps extension - Bit 1: Raw external data Cloud-hypervisor doesn't support bitmaps or external data files, so all autoclear bits are cleared on writable open. This signals other tools that these features' data may be stale. Readonly opens preserve autoclear bits unchanged. Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com> |
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