From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Fri, 25 May 2012 19:00:06 +0000 (-0400)
Subject: NFSv4.1: Handle NFS4ERR_SEQ_MISORDERED when confirming the lease
X-Git-Tag: v3.5-rc1~52^2~13
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=89a217360ef4e96eb83758cb9647f1c42581b097;p=profile%2Fivi%2Fkernel-x86-ivi.git

NFSv4.1: Handle NFS4ERR_SEQ_MISORDERED when confirming the lease

Apparently the patch "NFS: Always use the same SETCLIENTID boot verifier"
is tickling a Linux nfs server bug, and causing a regression: the server
can get into a situation where it keeps replying NFS4ERR_SEQ_MISORDERED
to our CREATE_SESSION request even when we are sending the correct
sequence ID.

Fix this by purging the lease and then retrying.

Reported-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 604c600..419f8c4 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1580,6 +1580,11 @@ out:
 static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
 {
 	switch (status) {
+	case -NFS4ERR_SEQ_MISORDERED:
+		if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state))
+			return -ESERVERFAULT;
+		/* Lease confirmation error: retry after purging the lease */
+		ssleep(1);
 	case -NFS4ERR_CLID_INUSE:
 	case -NFS4ERR_STALE_CLIENTID:
 		clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);