On 29/06/20 18:02, Eric Blake wrote: > - allocation implies that data comes from this layer of a backing chain, > rather than deferring to a backing image > > - allocation implies that storage is reserved (that is, not sparse) > > It sounds like we are trying to represent the second question for scsi > (namely, the same question that gets answered by lseek(SEEK_HOLE) for > POSIX files), and not the first (namely, the question answered for qcow2 > images). >
Yes, SCSI does not know about layers. Paolo
