From 17456804546b78a1c13d2b934c8f50bbde141a38 Mon Sep 17 00:00:00 2001
From: Bryan Schumaker <bjschuma@netapp.com>
Date: Wed, 13 Jul 2011 10:50:48 -0400
Subject: NFSD: Added TEST_STATEID operation

This operation is used by the client to check the validity of a list of
stateids.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
 fs/nfsd/nfs4state.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'fs/nfsd/nfs4state.c')

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 55c36e267b7d..12244cee1680 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -37,6 +37,7 @@
 #include <linux/slab.h>
 #include <linux/namei.h>
 #include <linux/swap.h>
+#include <linux/pagemap.h>
 #include <linux/sunrpc/svcauth_gss.h>
 #include <linux/sunrpc/clnt.h>
 #include "xdr4.h"
@@ -3145,6 +3146,32 @@ static int is_open_stateid(struct nfs4_stateid *stateid)
 	return stateid->st_openstp == NULL;
 }
 
+__be32 nfs4_validate_stateid(stateid_t *stateid, int flags)
+{
+	struct nfs4_stateid *stp = NULL;
+	__be32 status = nfserr_stale_stateid;
+
+	if (STALE_STATEID(stateid))
+		goto out;
+
+	status = nfserr_expired;
+	stp = search_for_stateid(stateid);
+	if (!stp)
+		goto out;
+	status = nfserr_bad_stateid;
+
+	if (!stp->st_stateowner->so_confirmed)
+		goto out;
+
+	status = check_stateid_generation(stateid, &stp->st_stateid, flags);
+	if (status)
+		goto out;
+
+	status = nfs_ok;
+out:
+	return status;
+}
+
 /*
 * Checks for stateid operations
 */
@@ -3242,6 +3269,17 @@ nfsd4_free_lock_stateid(struct nfs4_stateid *stp)
 	return nfs_ok;
 }
 
+/*
+ * Test if the stateid is valid
+ */
+__be32
+nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+		   struct nfsd4_test_stateid *test_stateid)
+{
+	test_stateid->ts_has_session = nfsd4_has_session(cstate);
+	return nfs_ok;
+}
+
 /*
  * Free a state id
  */
-- 
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