From ebec73f4752b777b79b384bd52e5240203cb9b00 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 21 Mar 2013 12:24:01 -0400
Subject: [PATCH] introduce variants of pipe_lock/pipe_unlock for real
 pipes/FIFOs

fs/pipe.c file_operations methods *know* that pipe is not an internal one;
no need to check pipe->inode for those callers.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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