On 11/05/2016 16:55, Alex Bligh wrote:
>> > Then I think I will propose a doc patch to the extension-info branch
>> > that adds new INFO items for NBD_INFO_TRIM_SIZE and
>> > NBD_INFO_WRITE_ZERO_SIZE (if requested by client and replied by server,
>> > then this can be larger than the normal maximum size in
>> > NBD_INFO_BLOCK_SIZE; if either side doesn't request the info, then
>> > assume any maximum in NBD_INFO_BLOCK_SIZE applies, otherwise UINT32_MAX;
>> > and the two infos are separate items because NBD_FLAG_SEND_TRIM and
>> > NBD_FLAG_SEND_WRITE_ZEROES are orthogonally optional).
> mmmm ...
> 
> at this rate you'd be better with a list of command / maximum size
> tuples!

Not sure if serious or not, but anyway I think enumerating the items
individually should be enough.  It's not like commands grow on trees. :)

Paolo