Christoph Hellwig <hch@xxxxxx> wrote:
> We'll you'd need to implement a IOCB_NOHOLE, but that wouldn't be all
> that hard. Having a READ_PLUS like interface that actually tells you
> how large the hole is might be hard.
Actually, that raises another couple of questions:
(1) Is a filesystem allowed to join up two disjoint blocks of data with a
block of zeros to make a single extent? If this happens, I'll see the
inserted block of zeros to be valid data.
(2) Is a filesystem allowed to punch out a block of valid zero data to make a
hole? This would cause me to refetch the data.
David
