nfs41: add a get_clid_cred function to nfs4_state_recovery_ops

EXCHANGE_ID has different credential requirements than SETCLIENTID.
Prepare for a separate credential function.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4_fs.h

@@ -179,6 +179,7 @@ struct nfs4_state_recovery_ops {
 	int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 	int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 	int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
+	struct rpc_cred * (*get_clid_cred)(struct nfs_client *);
 };
 
 struct nfs4_state_maintenance_ops {

fs/nfs/nfs4proc.c

@@ -4786,6 +4786,7 @@ struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
 	.recover_open	= nfs4_open_reclaim,
 	.recover_lock	= nfs4_lock_reclaim,
 	.establish_clid = nfs4_init_clientid,
+	.get_clid_cred	= nfs4_get_setclientid_cred,
 };
 
 #if defined(CONFIG_NFS_V4_1)
@@ -4804,6 +4805,7 @@ struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
 	.recover_open	= nfs4_open_expired,
 	.recover_lock	= nfs4_lock_expired,
 	.establish_clid = nfs4_init_clientid,
+	.get_clid_cred	= nfs4_get_setclientid_cred,
 };
 
 #if defined(CONFIG_NFS_V4_1)

fs/nfs/nfs4state.c

@@ -1102,7 +1102,7 @@ static int nfs4_reclaim_lease(struct nfs_client *clp)
 		nfs4_reboot_recovery_ops[clp->cl_minorversion];
 	int status = -ENOENT;
 
-	cred = nfs4_get_setclientid_cred(clp);
+	cred = ops->get_clid_cred(clp);
 	if (cred != NULL) {
 		status = ops->establish_clid(clp, cred);
 		put_rpccred(cred);