Re: [Libguestfs] [libnbd PATCH v3 03/22] protocol: Add definitions for extended headers

BTW I'm foreseeing a problem: if the extended block descriptor can provide an unsigned 64-bit length, we're going to have trouble exposing that in OCaml, because OCaml only has signed 64-bit integers. So that's going to reproduce the same issue, only for OCaml callers of the *new* API. I can see Eric's series includes patches like "ocaml: Add example for 64-bit extents" -- I've not looked at those yet; for now I'm just wondering what tricks we might need in the bindings generator. The method seen in the "middle patch" above won't work; we don't have a native OCaml "i128" type for example that we could use as an escape hatch, for representing C's uint64_t.