NFSv41: Fix nfs4_proc_create_session

We should not assume that nfs41_init_clientid() will always want to
initialise the session. If it is being called due to a server reboot, then
we just want to reset the session after re-establishing the clientid.

Fix this by getting rid of the 'reset' parameter in
nfs4_proc_create_session(), and instead relying on whether or not the
session slot table pointer is non-NULL.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4_fs.h

@@ -222,7 +222,7 @@ extern int nfs4_setup_sequence(struct nfs_client *clp,
 		int cache_reply, struct rpc_task *task);
 extern void nfs4_destroy_session(struct nfs4_session *session);
 extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
-extern int nfs4_proc_create_session(struct nfs_client *, int reset);
+extern int nfs4_proc_create_session(struct nfs_client *);
 extern int nfs4_proc_destroy_session(struct nfs4_session *);
 extern int nfs4_init_session(struct nfs_server *server);
 #else /* CONFIG_NFS_v4_1 */

fs/nfs/nfs4proc.c

@@ -4501,7 +4501,6 @@ static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
 	spin_lock(&tbl->slot_tbl_lock);
 	for (i = 0; i < max_slots; ++i)
 		tbl->slots[i].seq_nr = ivalue;
-	tbl->highest_used_slotid = -1;
 	spin_unlock(&tbl->slot_tbl_lock);
 	dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
 		tbl, tbl->slots, tbl->max_slots);
@@ -4552,7 +4551,6 @@ static void nfs4_destroy_slot_tables(struct nfs4_session *session)
 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
 		int max_slots, int ivalue)
 {
-	int i;
 	struct nfs4_slot *slot;
 	int ret = -ENOMEM;
 
@@ -4563,18 +4561,9 @@ static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
 	slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
 	if (!slot)
 		goto out;
-	for (i = 0; i < max_slots; ++i)
-		slot[i].seq_nr = ivalue;
 	ret = 0;
 
 	spin_lock(&tbl->slot_tbl_lock);
-	if (tbl->slots != NULL) {
-		spin_unlock(&tbl->slot_tbl_lock);
-		dprintk("%s: slot table already initialized. tbl=%p slots=%p\n",
-			__func__, tbl, tbl->slots);
-		WARN_ON(1);
-		goto out_free;
-	}
 	tbl->max_slots = max_slots;
 	tbl->slots = slot;
 	tbl->highest_used_slotid = -1;  /* no slot is currently used */
@@ -4584,28 +4573,31 @@ static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
 out:
 	dprintk("<-- %s: return %d\n", __func__, ret);
 	return ret;
-
-out_free:
-	kfree(slot);
-	goto out;
 }
 
 /*
  * Initialize the forechannel and backchannel tables
  */
 static int nfs4_init_slot_tables(struct nfs4_session *session)
 {
-	int status;
+	struct nfs4_slot_table *tbl;
+	int status = 0;
 
-	status = nfs4_init_slot_table(&session->fc_slot_table,
-			session->fc_attrs.max_reqs, 1);
-	if (status)
-		return status;
+	tbl = &session->fc_slot_table;
+	if (tbl->slots == NULL) {
+		status = nfs4_init_slot_table(tbl,
+				session->fc_attrs.max_reqs, 1);
+		if (status)
+			return status;
+	}
 
-	status = nfs4_init_slot_table(&session->bc_slot_table,
-			session->bc_attrs.max_reqs, 0);
-	if (status)
-		nfs4_destroy_slot_tables(session);
+	tbl = &session->bc_slot_table;
+	if (tbl->slots == NULL) {
+		status = nfs4_init_slot_table(tbl,
+				session->bc_attrs.max_reqs, 0);
+		if (status)
+			nfs4_destroy_slot_tables(session);
+	}
 
 	return status;
 }
@@ -4784,7 +4776,7 @@ static int _nfs4_proc_create_session(struct nfs_client *clp)
  * It is the responsibility of the caller to verify the session is
  * expired before calling this routine.
  */
-int nfs4_proc_create_session(struct nfs_client *clp, int reset)
+int nfs4_proc_create_session(struct nfs_client *clp)
 {
 	int status;
 	unsigned *ptr;
@@ -4797,31 +4789,27 @@ int nfs4_proc_create_session(struct nfs_client *clp, int reset)
 	if (status)
 		goto out;
 
-	/* Init or reset the fore channel */
-	if (reset)
-		status = nfs4_reset_slot_tables(session);
-	else
-		status = nfs4_init_slot_tables(session);
-	dprintk("fore channel slot table initialization returned %d\n", status);
+	/* Init and reset the fore channel */
+	status = nfs4_init_slot_tables(session);
+	dprintk("slot table initialization returned %d\n", status);
+	if (status)
+		goto out;
+	status = nfs4_reset_slot_tables(session);
+	dprintk("slot table reset returned %d\n", status);
 	if (status)
 		goto out;
 
 	ptr = (unsigned *)&session->sess_id.data[0];
 	dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
 		clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
 
-	if (reset)
-		/* Lease time is aleady set */
-		goto out;
-
 	/* Get the lease time */
 	status = nfs4_proc_get_lease_time(clp, &fsinfo);
 	if (status == 0) {
 		/* Update lease time and schedule renewal */
 		spin_lock(&clp->cl_lock);
 		clp->cl_lease_time = fsinfo.lease_time * HZ;
 		clp->cl_last_renewal = jiffies;
-		clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
 		spin_unlock(&clp->cl_lock);
 
 		nfs4_schedule_state_renewal(clp);

fs/nfs/nfs4state.c

@@ -123,7 +123,7 @@ int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred)
 	status = nfs4_proc_exchange_id(clp, cred);
 	if (status == 0)
 		/* create session schedules state renewal upon success */
-		status = nfs4_proc_create_session(clp, 0);
+		status = nfs4_proc_create_session(clp);
 	if (status == 0)
 		nfs_mark_client_ready(clp, NFS_CS_READY);
 	return status;
@@ -1240,7 +1240,7 @@ static int nfs4_reset_session(struct nfs_client *clp)
 	}
 
 	memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN);
-	status = nfs4_proc_create_session(clp, 1);
+	status = nfs4_proc_create_session(clp);
 	if (status)
 		nfs4_session_recovery_handle_error(clp, status);
 		/* fall through*/