Anatol Belski e913d0d9cb block: qcow: Implement DISCARD with sparse aware deallocation ...

Implement DISCARD using QCOW2 zero flag (bit 0 of L2 entries) with
sparse aware behavior.

When sparse=true - fully deallocate clusters by decrementing
refcount, clearing L2 entry, and reclaiming storage via punch_hole
when refcount reaches zero.

When sparse=false - use zero flag to keep storage allocated while
marking as reading zeros. Only works when cluster is not shared.
Shared clusters are fully deallocated.

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

2026-02-13 18:44:30 +00:00

..

src

block: qcow: Implement DISCARD with sparse aware deallocation

2026-02-13 18:44:30 +00:00

Cargo.toml

block: qcow: Validate incompatible feature bits

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