From 18c03cfd403b88852f75f200206983ee6df28423 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 21 Mar 2013 02:16:30 -0400
Subject: [PATCH] pipe: preparation to new locking rules

* use the fact that file_inode(file)->i_pipe doesn't change
  while the file is opened - no locks needed to access that.
* switch to pipe_lock/pipe_unlock where it's easy to do

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
Reading git-format-patch failed