From 4e8c765d384e549f9b542ea0bd42e2aa227e1404 Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@redhat.com>
Date: Fri, 21 Jun 2013 08:58:16 -0400
Subject: [PATCH] locks: avoid taking global lock if possible when waking up
 blocked waiters

Since we always hold the i_lock when inserting a new waiter onto the
fl_block list, we can avoid taking the global lock at all if we find
that it's empty when we go to wake up blocked waiters.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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