[PATCH v5 6/9] NFSD check stateids against copy stateids

[Olga Kornievskaia <olga.kornievskaia@gmail.com>]

Incoming stateid (used by a READ) could be a saved copy stateid.
Update the copy notify timestamp (cpntf_time) with current time.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/nfsd/nfs4state.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index bd962f1..31a32ec 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -5672,6 +5672,43 @@ void free_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
 	nfs4_put_stid(cps->cp_p_stid);
 	kfree(cps);
 }
+/*
+ * A READ from an inter server to server COPY will have a
+ * copy stateid. Return the parent nfs4_stid.
+ */
+static __be32 _find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
+		     struct nfs4_cpntf_state **cps)
+{
+	struct nfs4_cpntf_state *state = NULL;
+
+	if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
+		return nfserr_bad_stateid;
+	spin_lock(&nn->s2s_cp_lock);
+	state = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
+	if (state)
+		refcount_inc(&state->cp_p_stid->sc_count);
+	spin_unlock(&nn->s2s_cp_lock);
+	if (!state)
+		return nfserr_bad_stateid;
+	*cps = state;
+	return 0;
+}
+
+static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
+			       struct nfs4_stid **stid)
+{
+	__be32 status;
+	struct nfs4_cpntf_state *cps = NULL;
+
+	status = _find_cpntf_state(nn, st, &cps);
+	if (status)
+		return status;
+
+	cps->cpntf_time = get_seconds();
+	*stid = cps->cp_p_stid;
+
+	return nfs_ok;
+}
 
 /*
  * Checks for stateid operations
@@ -5704,6 +5741,8 @@ void free_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
 	status = nfsd4_lookup_stateid(cstate, stateid,
 				NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
 				&s, nn);
+	if (status == nfserr_bad_stateid)
+		status = find_cpntf_state(nn, stateid, &s);
 	if (status)
 		return status;
 	status = nfsd4_stid_check_stateid_generation(stateid, s,
-- 
1.8.3.1