Re: [RFC] splice/tee: len=0 fast path after validity check

[Pavel Begunkov <asml.silence@gmail.com>]

On 09/05/2020 17:42, Jens Axboe wrote:
> On 5/9/20 2:46 AM, Pavel Begunkov wrote:
>> When len=0, splice() and tee() return 0 even if specified fds are
>> invalid, hiding errors from users. Move len=0 optimisation later after
>> basic validity checks.
>>
>> before:
>> splice(len=0, fd_in=-1, ...) == 0;
>>
>> after:
>> splice(len=0, fd_in=-1, ...) == -EBADF;
> 
> I'm not sure what the purpose of this would be. It probably should have
> been done that way from the beginning, but it wasn't.  While there's
> very little risk of breaking any applications due to this change, it
> also seems like a pointless exercise at this point.
> 
> So my suggestion would be to just leave it alone.

Ok

-- 
Pavel Begunkov