From 65b62a29f719e937b5be1df472287f4c61e53ac6 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Thu, 7 Feb 2013 10:54:07 -0500
Subject: [PATCH] NFSv4: Ensure delegation recall and byte range lock removal
 don't conflict

Add a mutex to the struct nfs4_state_owner to ensure that delegation
recall doesn't conflict with byte range lock removal.

Note that we nest the new mutex _outside_ the state manager reclaim
protection (nfsi->rwsem) in order to avoid deadlocks.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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