From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Thu, 22 Sep 2016 17:39:01 +0000 (-0400)
Subject: NFSv4.1: Don't recheck delegations that have already been checked
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=63d63cbf5e03f47c99baa0a1ba1c345fe426e3bd;p=linux-beck.git

NFSv4.1: Don't recheck delegations that have already been checked

Ensure we don't spam the server with test_stateid() calls for
delegations that have already been checked.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 083786aad83c..dfa46e49e356 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2459,6 +2459,11 @@ static void nfs41_check_delegation_stateid(struct nfs4_state *state)
 		return;
 	}
 
+	if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags)) {
+		rcu_read_unlock();
+		return;
+	}
+
 	cred = get_rpccred(delegation->cred);
 	rcu_read_unlock();
 	status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);