Due to a bug in my program, I initiated a read beyond eof. Specifically, 
the file size is 13002 bytes and the read offset is 13312 (0x3400).

I would expect such a read to return 0 bytes read, but io_getevents 
returns -310, which is suspiciously equal to (13002 - 13312).

I attach a reproducer.

4.2.5-201.fc22.x86_64

Are my expectations incorrect, or is this a bug in aio or xfs?