On Wed 20 Nov 2019 01:27:53 PM CET, Vladimir Semeeausntsov-Ogievskiy wrote:
> 3. Also, the latter way is inconsistent with discard. Discarded > regions returns zeroes, not clusters from backing. I think discard and > truncate should behave in the same safe zero way. But then PREALLOC_MODE_OFF implies that the L2 metadata should be preallocated (all clusters should be QCOW2_CLUSTER_ZERO_PLAIN), at least when there is a backing file. Or maybe we just forbid PREALLOC_MODE_OFF during resize if there is a backing file ? Berto
