46e6ecddfe
Add supports_zero_flag() to DiskFile trait to indicate whether a disk format can mark clusters/blocks as reading zeros without deallocating storage. QCOW2 supports this via the zero flag in L2 entries. VHDX also has PAYLOAD_BLOCK_ZERO state for this, though it's not yet implemented in cloud-hypervisor. This enables DISCARD to be advertised even with sparse=false for formats with zero-flag support, since they can mark regions as zeros (keeps storage allocated) instead of requiring full deallocation. Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com> |
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| src | ||
| build.rs | ||
| Cargo.toml | ||