Samba actually ran into this with io_uring. It can return less that the client asked for for read/write. We were returning this to the client and the clients...

Samba actually ran into this with io_uring. It can return less that the client asked for for read/write. We were returning this to the client and the clients... didn't cope well (even though the protocol is supposed to allow this :-). The Samba client code worked fine though :-).