NFSv4: Remove requirement for machine creds for the "setclientid" operation

 Use a cred from the nfs4_client->cl_state_owners list.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/inode.c

@@ -1822,23 +1822,9 @@ static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data,
 		clnt->cl_softrtry = 1;
 		clnt->cl_chatty   = 1;
 		clp->cl_rpcclient = clnt;
-		clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
-		if (IS_ERR(clp->cl_cred)) {
-			up_write(&clp->cl_sem);
-			err = PTR_ERR(clp->cl_cred);
-			clp->cl_cred = NULL;
-			goto out_fail;
-		}
 		memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
 		nfs_idmap_new(clp);
 	}
-	if (list_empty(&clp->cl_superblocks)) {
-		err = nfs4_init_client(clp);
-		if (err != 0) {
-			up_write(&clp->cl_sem);
-			goto out_fail;
-		}
-	}
 	list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
 	clnt = rpc_clone_client(clp->cl_rpcclient);
 	if (!IS_ERR(clnt))

fs/nfs/nfs4_fs.h

@@ -68,7 +68,6 @@ struct nfs4_client {
 	atomic_t		cl_count;
 
 	struct rpc_clnt *	cl_rpcclient;
-	struct rpc_cred *	cl_cred;
 
 	struct list_head	cl_superblocks;	/* List of nfs_server structs */
 
@@ -211,8 +210,8 @@ extern ssize_t nfs4_listxattr(struct dentry *, char *, size_t);
 
 /* nfs4proc.c */
 extern int nfs4_map_errors(int err);
-extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short);
-extern int nfs4_proc_setclientid_confirm(struct nfs4_client *);
+extern int nfs4_proc_setclientid(struct nfs4_client *, u32, unsigned short, struct rpc_cred *);
+extern int nfs4_proc_setclientid_confirm(struct nfs4_client *, struct rpc_cred *);
 extern int nfs4_proc_async_renew(struct nfs4_client *, struct rpc_cred *);
 extern int nfs4_proc_renew(struct nfs4_client *, struct rpc_cred *);
 extern int nfs4_do_close(struct inode *inode, struct nfs4_state *state);
@@ -238,7 +237,6 @@ extern void init_nfsv4_state(struct nfs_server *);
 extern void destroy_nfsv4_state(struct nfs_server *);
 extern struct nfs4_client *nfs4_get_client(struct in_addr *);
 extern void nfs4_put_client(struct nfs4_client *clp);
-extern int nfs4_init_client(struct nfs4_client *clp);
 extern struct nfs4_client *nfs4_find_client(struct in_addr *);
 struct rpc_cred *nfs4_get_renew_cred(struct nfs4_client *clp);
 extern u32 nfs4_alloc_lockowner_id(struct nfs4_client *);

fs/nfs/nfs4proc.c

@@ -2846,7 +2846,7 @@ int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct
 	return nfs4_map_errors(ret);
 }
 
-int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port)
+int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
 {
 	nfs4_verifier sc_verifier;
 	struct nfs4_setclientid setclientid = {
@@ -2857,7 +2857,7 @@ int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short p
 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
 		.rpc_argp = &setclientid,
 		.rpc_resp = clp,
-		.rpc_cred = clp->cl_cred,
+		.rpc_cred = cred,
 	};
 	u32 *p;
 	int loop = 0;
@@ -2871,7 +2871,7 @@ int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short p
 		setclientid.sc_name_len = scnprintf(setclientid.sc_name,
 				sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
 				clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
-				clp->cl_cred->cr_ops->cr_name,
+				cred->cr_ops->cr_name,
 				clp->cl_id_uniquifier);
 		setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
 				sizeof(setclientid.sc_netid), "tcp");
@@ -2894,14 +2894,14 @@ int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short p
 }
 
 int
-nfs4_proc_setclientid_confirm(struct nfs4_client *clp)
+nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
 {
 	struct nfs_fsinfo fsinfo;
 	struct rpc_message msg = {
 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
 		.rpc_argp = clp,
 		.rpc_resp = &fsinfo,
-		.rpc_cred = clp->cl_cred,
+		.rpc_cred = cred,
 	};
 	unsigned long now;
 	int status;

fs/nfs/nfs4state.c

@@ -91,11 +91,10 @@ nfs4_alloc_client(struct in_addr *addr)
 
 	if (nfs_callback_up() < 0)
 		return NULL;
-	if ((clp = kmalloc(sizeof(*clp), GFP_KERNEL)) == NULL) {
+	if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL) {
 		nfs_callback_down();
 		return NULL;
 	}
-	memset(clp, 0, sizeof(*clp));
 	memcpy(&clp->cl_addr, addr, sizeof(clp->cl_addr));
 	init_rwsem(&clp->cl_sem);
 	INIT_LIST_HEAD(&clp->cl_delegations);
@@ -108,7 +107,7 @@ nfs4_alloc_client(struct in_addr *addr)
 	rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS4 client");
 	clp->cl_rpcclient = ERR_PTR(-EINVAL);
 	clp->cl_boot_time = CURRENT_TIME;
-	clp->cl_state = 0;
+	clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
 	return clp;
 }
 
@@ -125,8 +124,6 @@ nfs4_free_client(struct nfs4_client *clp)
 		kfree(sp);
 	}
 	BUG_ON(!list_empty(&clp->cl_state_owners));
-	if (clp->cl_cred)
-		put_rpccred(clp->cl_cred);
 	nfs_idmap_delete(clp);
 	if (!IS_ERR(clp->cl_rpcclient))
 		rpc_shutdown_client(clp->cl_rpcclient);
@@ -196,21 +193,17 @@ nfs4_put_client(struct nfs4_client *clp)
 	nfs4_free_client(clp);
 }
 
-static int __nfs4_init_client(struct nfs4_client *clp)
+static int nfs4_init_client(struct nfs4_client *clp, struct rpc_cred *cred)
 {
-	int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, nfs_callback_tcpport);
+	int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK,
+			nfs_callback_tcpport, cred);
 	if (status == 0)
-		status = nfs4_proc_setclientid_confirm(clp);
+		status = nfs4_proc_setclientid_confirm(clp, cred);
 	if (status == 0)
 		nfs4_schedule_state_renewal(clp);
 	return status;
 }
 
-int nfs4_init_client(struct nfs4_client *clp)
-{
-	return nfs4_map_errors(__nfs4_init_client(clp));
-}
-
 u32
 nfs4_alloc_lockowner_id(struct nfs4_client *clp)
 {
@@ -246,6 +239,18 @@ struct rpc_cred *nfs4_get_renew_cred(struct nfs4_client *clp)
 	return cred;
 }
 
+struct rpc_cred *nfs4_get_setclientid_cred(struct nfs4_client *clp)
+{
+	struct nfs4_state_owner *sp;
+
+	if (!list_empty(&clp->cl_state_owners)) {
+		sp = list_entry(clp->cl_state_owners.next,
+				struct nfs4_state_owner, so_list);
+		return get_rpccred(sp->so_cred);
+	}
+	return NULL;
+}
+
 static struct nfs4_state_owner *
 nfs4_find_state_owner(struct nfs4_client *clp, struct rpc_cred *cred)
 {
@@ -902,6 +907,7 @@ static int reclaimer(void *ptr)
 	struct nfs4_client *clp = ptr;
 	struct nfs4_state_owner *sp;
 	struct nfs4_state_recovery_ops *ops;
+	struct rpc_cred *cred;
 	int status = 0;
 
 	allow_signal(SIGKILL);
@@ -913,20 +919,33 @@ static int reclaimer(void *ptr)
 	if (list_empty(&clp->cl_superblocks))
 		goto out;
 restart_loop:
-	status = nfs4_proc_renew(clp, clp->cl_cred);
+	ops = &nfs4_network_partition_recovery_ops;
+	/* Are there any open files on this volume? */
+	cred = nfs4_get_renew_cred(clp);
+	if (cred != NULL) {
+		/* Yes there are: try to renew the old lease */
+		status = nfs4_proc_renew(clp, cred);
 		switch (status) {
 			case 0:
 			case -NFS4ERR_CB_PATH_DOWN:
+				put_rpccred(cred);
 				goto out;
 			case -NFS4ERR_STALE_CLIENTID:
 			case -NFS4ERR_LEASE_MOVED:
 				ops = &nfs4_reboot_recovery_ops;
-			break;
-		default:
-			ops = &nfs4_network_partition_recovery_ops;
-	};
+		}
+	} else {
+		/* "reboot" to ensure we clear all state on the server */
+		clp->cl_boot_time = CURRENT_TIME;
+		cred = nfs4_get_setclientid_cred(clp);
+	}
+	/* We're going to have to re-establish a clientid */
 	nfs4_state_mark_reclaim(clp);
-	status = __nfs4_init_client(clp);
+	status = -ENOENT;
+	if (cred != NULL) {
+		status = nfs4_init_client(clp, cred);
+		put_rpccred(cred);
+	}
 	if (status)
 		goto out_error;
 	/* Mark all delegations for reclaim */