nfsd4: use client pointer to backchannel session

Instead of copying the sessionid, use the new cl_cb_session pointer,
which indicates which session we're using for the backchannel.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

fs/nfsd/nfs4callback.c

@@ -251,6 +251,7 @@ encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_callback *cb,
 		   struct nfs4_cb_compound_hdr *hdr)
 {
 	__be32 *p;
+	struct nfsd4_session *ses = cb->cb_clp->cl_cb_session;
 
 	if (hdr->minorversion == 0)
 		return;
@@ -258,7 +259,7 @@ encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_callback *cb,
 	RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20);
 
 	WRITE32(OP_CB_SEQUENCE);
-	WRITEMEM(cb->cb_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN);
+	WRITEMEM(ses->se_sessionid.data, NFS4_MAX_SESSIONID_LEN);
 	WRITE32(cb->cb_clp->cl_cb_seq_nr);
 	WRITE32(0);		/* slotid, always 0 */
 	WRITE32(0);		/* highest slotid always 0 */
@@ -341,6 +342,7 @@ static int
 decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_callback *cb,
 		   struct rpc_rqst *rqstp)
 {
+	struct nfsd4_session *ses = cb->cb_clp->cl_cb_session;
 	struct nfs4_sessionid id;
 	int status;
 	u32 dummy;
@@ -362,8 +364,7 @@ decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_callback *cb,
 	READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
 	memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
 	p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
-	if (memcmp(id.data, cb->cb_clp->cl_sessionid.data,
-		   NFS4_MAX_SESSIONID_LEN)) {
+	if (memcmp(id.data, ses->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
 		dprintk("%s Invalid session id\n", __func__);
 		goto out;
 	}
@@ -587,7 +588,7 @@ void nfsd4_probe_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
 static int nfsd41_cb_setup_sequence(struct nfs4_client *clp,
 		struct rpc_task *task)
 {
-	u32 *ptr = (u32 *)clp->cl_sessionid.data;
+	u32 *ptr = (u32 *)clp->cl_cb_session->se_sessionid.data;
 	int status = 0;
 
 	dprintk("%s: %u:%u:%u:%u\n", __func__,

fs/nfsd/nfs4state.c

@@ -753,8 +753,6 @@ static __be32 alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp
 
 	new->se_client = clp;
 	gen_sessionid(new);
-	memcpy(clp->cl_sessionid.data, new->se_sessionid.data,
-	       NFS4_MAX_SESSIONID_LEN);
 
 	INIT_LIST_HEAD(&new->se_conns);
 
@@ -1544,7 +1542,7 @@ nfsd4_create_session(struct svc_rqst *rqstp,
 	if (status)
 		goto out;
 
-	memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data,
+	memcpy(cr_ses->sessionid.data, conf->cl_cb_session->se_sessionid.data,
 	       NFS4_MAX_SESSIONID_LEN);
 	cr_ses->seqid = cs_slot->sl_seqid;
 

fs/nfsd/state.h

@@ -243,7 +243,6 @@ struct nfs4_client {
 	struct list_head	cl_sessions;
 	struct nfsd4_clid_slot	cl_cs_slot;	/* create_session slot */
 	u32			cl_exchange_flags;
-	struct nfs4_sessionid	cl_sessionid;
 	/* number of rpc's in progress over an associated session: */
 	atomic_t		cl_refcount;