Anatol Belski 4545fe113e block: qcow: Clear autoclear features on writable open ...

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>

2026-02-03 14:39:18 +00:00

..

src

block: qcow: Clear autoclear features on writable open

2026-02-03 14:39:18 +00:00

Cargo.toml

block: qcow: Validate incompatible feature bits

2026-01-23 18:58:56 +00:00