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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Trond Myklebust <trond.myklebust@primarydata.com>,
        "J. Bruce Fields" <bfields@redhat.com>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.9 41/86] nfsd: CLOSE SHOULD return the invalid special stateid for NFSv4.x (x>0)
Date:   Fri,  2 Feb 2018 17:58:01 +0100
Message-Id: <20180202140826.148532980@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

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


[ Upstream commit fb500a7cfee7f2f447d2bbf30cb59629feab6ac1 ]

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/nfsd/nfs4state.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -63,6 +63,9 @@ static const stateid_t zero_stateid = {
 static const stateid_t currentstateid = {
 	.si_generation = 1,
 };
+static const stateid_t close_stateid = {
+	.si_generation = 0xffffffffU,
+};
 
 static u64 current_sessionid = 1;
 
@@ -5407,6 +5410,11 @@ nfsd4_close(struct svc_rqst *rqstp, stru
 	nfsd4_close_open_stateid(stp);
 	mutex_unlock(&stp->st_mutex);
 
+	/* See RFC5661 sectionm 18.2.4 */
+	if (stp->st_stid.sc_client->cl_minorversion)
+		memcpy(&close->cl_stateid, &close_stateid,
+				sizeof(close->cl_stateid));
+
 	/* put reference from nfs4_preprocess_seqid_op */
 	nfs4_put_stid(&stp->st_stid);
 out: