block: qcow: Refactor BackingFile for ownership based decomposition

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Replace the clone based BackingFileOps trait with a BackingKind enum
so backing files can be decomposed into their concrete owned types.

BackingFile::new() for QCOW2 backings now calls parse_qcow() directly
instead of building a full QcowFile. Remove Clone for BackingFile and
QcowFile.

Prerequisite for the qcow_sync rewrite which decomposes a BackingFile
into a raw fd or QcowMetadata for lock free I/O.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>

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This commit is contained in:

Anatol Belski

2026-02-21 16:52:20 +01:00

committed by Rob Bradford

parent a4a5b19f64

commit 57e89b04f6

3 changed files with 813 additions and 364 deletions

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block/src/qcow_sync.rs

+685 -314

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