From aadd06e5c56b9ff5117ec77e59eada43dc46e2fc Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@suse.de>
Date: Mon, 10 Jul 2006 11:00:01 +0200
Subject: [PATCH] [PATCH] splice: fix problems with sys_tee()

Several issues noticed/fixed:

- We cannot reliably block in link_pipe() while holding both input and output
  mutexes. So do preparatory checks before locking down both mutexes and doing
  the link.

- The ipipe->nrbufs vs i check was bad, because we could have dropped the
  ipipe lock in-between. This causes us to potentially look at unknown
  buffers if we were racing with someone else reading this pipe.

Signed-off-by: Jens Axboe <axboe@suse.de>
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