Question about loop device DIO/AIO and FLUSH

Hi Ming,

I was reading through the code of loop DIO/AIO
and I was wondering whether lo_req_flush() really
honors REQ_FLUSH by calling  vfs_fsync() on a backing file
that is open with O_DIRECT?

Shouldn't lo_req_flush() actually wait for completion of
all the in-flight loop AIO requests to complete?
Am I missing something?

Thanks,
Amir.