[Libguestfs] [PATCH v2v] vddk: Use blocksize filter to split very large requests

[Richard W.M. Jones]

Predictably this makes no difference to the current code since nbdcopy
is using 256K requests.  I will do some real testing when Nir pushes
his change here:

https://listman.redhat.com/archives/libguestfs/2022-February/msg00188.html

Nir - do you want to actually increase that back to 8M?  In theory
(untested) it should be safe provided it's combined with something
like this patch.

Rich.