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...that the first write of the bulk zero is representative of the overall operation (and so in practice, it only takes one fast zero attempt to learn if bulk zeroing is worthwhile, then continue with fast zeroes without issues). > > I understand that fail-on-first ENOTSUP is OK for raw-without-fallocte vs qcow2, > as first will always return ENOTSUP and second will never fail.. But in such way > we'll OK with simpler extension, which only have one server-advirtised negotiation > flag NBD_FLAG_ZERO_IS_FAST. Advertising that a server's zero behavior is always going to be successf...

This is a cover letter to a series of patches being proposed in tandem to four different projects: - nbd: Document a new NBD_CMD_FLAG_FAST_ZERO command flag - qemu: Implement the flag for both clients and server - libnbd: Implement the flag for clients - nbdkit: Implement the flag for servers, including the nbd passthrough client If you want to test the patches together, I've pushed a