From 48f5ec21d9c67e881ff35343988e290ef5cf933f Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 9 Sep 2013 15:22:25 -0400
Subject: [PATCH] split read_seqretry_or_unlock(), convert d_walk() to
 resulting primitives

Separate "check if we need to retry" from "unlock if we are done and
had seq_writelock"; that allows to use these guys in d_walk(), where
we need to recheck every time we ascend back to parent, but do *not*
want to unlock until the very end.  Lift rcu_read_lock/rcu_read_unlock
out into callers.

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