Patch "NFSv4.1: Fix the CREATE_SESSION slot number accounting" has been added to the 4.4-stable tree

Patch "NFSv4.1: Fix the CREATE_SESSION slot number accounting" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    NFSv4.1: Fix the CREATE_SESSION slot number accounting

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfsv4.1-fix-the-create_session-slot-number-accounting.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From b519d408ea32040b1c7e10b155a3ee9a36660947 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Sun, 11 Sep 2016 14:50:01 -0400
Subject: NFSv4.1: Fix the CREATE_SESSION slot number accounting

From: Trond Myklebust <trond.myklebust@primarydata.com>

commit b519d408ea32040b1c7e10b155a3ee9a36660947 upstream.

Ensure that we conform to the algorithm described in RFC5661, section
18.36.4 for when to bump the sequence id. In essence we do it for all
cases except when the RPC call timed out, or in case of the server returning
NFS4ERR_DELAY or NFS4ERR_STALE_CLIENTID.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/nfs/nfs4proc.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7424,12 +7424,20 @@ static int _nfs4_proc_create_session(str
 	status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
 	trace_nfs4_create_session(clp, status);
 
+	switch (status) {
+	case -NFS4ERR_STALE_CLIENTID:
+	case -NFS4ERR_DELAY:
+	case -ETIMEDOUT:
+	case -EACCES:
+	case -EAGAIN:
+		goto out;
+	};
+
+	clp->cl_seqid++;
 	if (!status) {
 		/* Verify the session's negotiated channel_attrs values */
 		status = nfs4_verify_channel_attrs(&args, &res);
 		/* Increment the clientid slot sequence id */
-		if (clp->cl_seqid == res.seqid)
-			clp->cl_seqid++;
 		if (status)
 			goto out;
 		nfs4_update_session(session, &res);


Patches currently in stable-queue which might be from trond.myklebust@primarydata.com are

queue-4.4/nfsv4.1-fix-oopsable-condition-in-server-callback-races.patch
queue-4.4/pnfs-ensure-layoutget-and-layoutreturn-are-properly-serialised.patch
queue-4.4/nfsv4.x-fix-a-refcount-leak-in-nfs_callback_up_net.patch
queue-4.4/nfsv4.1-fix-the-create_session-slot-number-accounting.patch
queue-4.4/pnfs-the-client-must-not-do-i-o-to-the-ds-if-it-s-lease-has-expired.patch