Re: [PATCH v1 1/5] IB/uverbs: ex_query_device: answer must not depend on request's comp_mask

On Thu, Jan 29, 2015 at 07:43:29PM +0100, Yann Droneaud wrote:

The write() syscall must return the size buffer passed to it, or
less, but in such case it would ask for trouble as userspace would
be allowed to write() the remaining bytes.  Returning a size bigger
than the one passed to write() is not acceptable and would break any
expectation.

By that logic the 0 return is still wrong, and it should be ucore->in_len

But I think we can return less without risking anything breaking, it
already violates the invariant associated with write() - it mutates
the buffer passed in!

Jason
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