tree 28a5817e0bb4aaf174c9d8a87f34a8aefd754aa6
parent 5d87a052c7e5f245bbb3018721b4b0afe0afc252
author Jens Axboe <jens.axboe@oracle.com> 1203500091 +0100
committer Jens Axboe <axboe@carl.home.kernel.dk> 1204625679 +0100

splice: only return -EAGAIN if there's hope of more data

sys_tee() currently is a bit eager in returning -EAGAIN, it may do so
even if we don't have a chance of anymore data becoming available. So
improve the logic and only return -EAGAIN if we have an attached writer
to the input pipe.

Reported by Johann Felix Soden <johfel@gmx.de> and
Patrick McManus <mcmanus@ducksong.com>.

Tested-by: Johann Felix Soden <johfel@users.sourceforge.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>