[3.11.y.z extended stable] Patch "NFSv4: don't reprocess cached open CLAIM_PREVIOUS" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    NFSv4: don't reprocess cached open CLAIM_PREVIOUS

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 6ada40dc115132a479d1a43a2e68b75cc5716f48 Mon Sep 17 00:00:00 2001
From: Weston Andros Adamson <dros at netapp.com>
Date: Mon, 21 Oct 2013 13:10:13 -0400
Subject: NFSv4: don't reprocess cached open CLAIM_PREVIOUS

commit d2bfda2e7aa036f90ccea610a657064b1e267913 upstream.

Cached opens have already been handled by _nfs4_opendata_reclaim_to_nfs4_state
and can safely skip being reprocessed, but must still call update_open_stateid
to make sure that all active fmodes are recovered.

Signed-off-by: Weston Andros Adamson <dros at netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust at netapp.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 fs/nfs/nfs4proc.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 9960a5b..1761b67 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1230,10 +1230,13 @@ _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
 	struct nfs4_state *state = data->state;
 	int ret;

-	/* allow cached opens (!rpc_done && !rpc_status) */
-	if (!data->rpc_done && data->rpc_status) {
-		ret = data->rpc_status;
-		goto err;
+	if (!data->rpc_done) {
+		if (data->rpc_status) {
+			ret = data->rpc_status;
+			goto err;
+		}
+		/* cached opens have already been processed */
+		goto update;
 	}

 	ret = nfs_refresh_inode(inode, &data->f_attr);
@@ -1244,6 +1247,7 @@ _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)

 	if (data->o_res.delegation_type != 0)
 		nfs4_opendata_check_deleg(data, state);
+update:
 	update_open_stateid(state, &data->o_res.stateid, NULL,
 			    data->o_arg.fmode);
 	atomic_inc(&state->count);
--
1.8.3.2