linux-kernel - [PATCH 3.10 133/268] nfs: Don't increment lock sequence ID after NFS4ERR

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Date:   Mon, 19 Jun 2017 20:30:32 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Chuck Lever <chuck.lever@...cle.com>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 133/268] nfs: Don't increment lock sequence ID after NFS4ERR_MOVED

From: Chuck Lever <chuck.lever@...cle.com>

commit 059aa734824165507c65fd30a55ff000afd14983 upstream.

Xuan Qi reports that the Linux NFSv4 client failed to lock a file
that was migrated. The steps he observed on the wire:

1. The client sent a LOCK request to the source server
2. The source server replied NFS4ERR_MOVED
3. The client switched to the destination server
4. The client sent the same LOCK request to the destination
   server with a bumped lock sequence ID
5. The destination server rejected the LOCK request with
   NFS4ERR_BAD_SEQID

RFC 3530 section 8.1.5 provides a list of NFS errors which do not
bump a lock sequence ID.

However, RFC 3530 is now obsoleted by RFC 7530. In RFC 7530 section
9.1.7, this list has been updated by the addition of NFS4ERR_MOVED.

Reported-by: Xuan Qi <xuan.qi@...cle.com>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 include/linux/nfs4.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 7b8fc73..f2c7859 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -223,7 +223,7 @@ enum nfsstat4 {

 static inline bool seqid_mutating_err(u32 err)
 {
-	/* rfc 3530 section 8.1.5: */
+	/* See RFC 7530, section 9.1.7 */
 	switch (err) {
 	case NFS4ERR_STALE_CLIENTID:
 	case NFS4ERR_STALE_STATEID:
@@ -232,6 +232,7 @@ static inline bool seqid_mutating_err(u32 err)
 	case NFS4ERR_BADXDR:
 	case NFS4ERR_RESOURCE:
 	case NFS4ERR_NOFILEHANDLE:
+	case NFS4ERR_MOVED:
 		return false;
 	};
 	return true;
-- 
2.8.0.rc2.1.gbe9624a