1 files changed, 53 insertions, 93 deletions

diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index 89eb5621ebba..010f24a59da2 100644
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -56,7 +56,6 @@ static int tipc_nametbl_size = 1024;		/* must be a power of 2 */
  *       publications of the associated name sequence belong to it.
  *       (The cluster and node lists may be empty.)
  */
-
 struct name_info {
 	struct list_head node_list;
 	struct list_head cluster_list;
@@ -72,7 +71,6 @@ struct name_info {
  * @upper: name sequence upper bound
  * @info: pointer to name sequence publication info
  */
-
 struct sub_seq {
 	u32 lower;
 	u32 upper;
@@ -90,7 +88,6 @@ struct sub_seq {
  * @subscriptions: list of subscriptions for this 'type'
  * @lock: spinlock controlling access to publication lists of all sub-sequences
  */
-
 struct name_seq {
 	u32 type;
 	struct sub_seq *sseqs;
@@ -107,17 +104,14 @@ struct name_seq {
  *         accessed via hashing on 'type'; name sequence lists are *not* sorted
  * @local_publ_count: number of publications issued by this node
  */
-
 struct name_table {
 	struct hlist_head *types;
 	u32 local_publ_count;
 };
 
 static struct name_table table;
-static atomic_t rsv_publ_ok = ATOMIC_INIT(0);
 DEFINE_RWLOCK(tipc_nametbl_lock);
 
-
 static int hash(int x)
 {
 	return x & (tipc_nametbl_size - 1);
@@ -126,7 +120,6 @@ static int hash(int x)
 /**
  * publ_create - create a publication structure
  */
-
 static struct publication *publ_create(u32 type, u32 lower, u32 upper,
 				       u32 scope, u32 node, u32 port_ref,
 				       u32 key)
@@ -153,7 +146,6 @@ static struct publication *publ_create(u32 type, u32 lower, u32 upper,
 /**
  * tipc_subseq_alloc - allocate a specified number of sub-sequence structures
  */
-
 static struct sub_seq *tipc_subseq_alloc(u32 cnt)
 {
 	struct sub_seq *sseq = kcalloc(cnt, sizeof(struct sub_seq), GFP_ATOMIC);
@@ -165,7 +157,6 @@ static struct sub_seq *tipc_subseq_alloc(u32 cnt)
  *
  * Allocates a single sub-sequence structure and sets it to all 0's.
  */
-
 static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_head)
 {
 	struct name_seq *nseq = kzalloc(sizeof(*nseq), GFP_ATOMIC);
@@ -188,12 +179,23 @@ static struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_hea
 	return nseq;
 }
 
-/**
+/*
+ * nameseq_delete_empty - deletes a name sequence structure if now unused
+ */
+static void nameseq_delete_empty(struct name_seq *seq)
+{
+	if (!seq->first_free && list_empty(&seq->subscriptions)) {
+		hlist_del_init(&seq->ns_list);
+		kfree(seq->sseqs);
+		kfree(seq);
+	}
+}
+
+/*
  * nameseq_find_subseq - find sub-sequence (if any) matching a name instance
  *
  * Very time-critical, so binary searches through sub-sequence array.
  */
-
 static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
 					   u32 instance)
 {
@@ -223,7 +225,6 @@ static struct sub_seq *nameseq_find_subseq(struct name_seq *nseq,
  *
  * Note: Similar to binary search code for locating a sub-sequence.
  */
-
 static u32 nameseq_locate_subseq(struct name_seq *nseq, u32 instance)
 {
 	struct sub_seq *sseqs = nseq->sseqs;
@@ -244,9 +245,8 @@ static u32 nameseq_locate_subseq(struct name_seq *nseq, u32 instance)
 }
 
 /**
- * tipc_nameseq_insert_publ -
+ * tipc_nameseq_insert_publ
  */
-
 static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 						    u32 type, u32 lower, u32 upper,
 						    u32 scope, u32 node, u32 port, u32 key)
@@ -262,7 +262,6 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 	if (sseq) {
 
 		/* Lower end overlaps existing entry => need an exact match */
-
 		if ((sseq->lower != lower) || (sseq->upper != upper)) {
 			warn("Cannot publish {%u,%u,%u}, overlap error\n",
 			     type, lower, upper);
@@ -270,16 +269,21 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 		}
 
 		info = sseq->info;
+
+		/* Check if an identical publication already exists */
+		list_for_each_entry(publ, &info->zone_list, zone_list) {
+			if ((publ->ref == port) && (publ->key == key) &&
+			    (!publ->node || (publ->node == node)))
+				return NULL;
+		}
 	} else {
 		u32 inspos;
 		struct sub_seq *freesseq;
 
 		/* Find where lower end should be inserted */
-
 		inspos = nameseq_locate_subseq(nseq, lower);
 
 		/* Fail if upper end overlaps into an existing entry */
-
 		if ((inspos < nseq->first_free) &&
 		    (upper >= nseq->sseqs[inspos].lower)) {
 			warn("Cannot publish {%u,%u,%u}, overlap error\n",
@@ -288,7 +292,6 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 		}
 
 		/* Ensure there is space for new sub-sequence */
-
 		if (nseq->first_free == nseq->alloc) {
 			struct sub_seq *sseqs = tipc_subseq_alloc(nseq->alloc * 2);
 
@@ -316,7 +319,6 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 		INIT_LIST_HEAD(&info->zone_list);
 
 		/* Insert new sub-sequence */
-
 		sseq = &nseq->sseqs[inspos];
 		freesseq = &nseq->sseqs[nseq->first_free];
 		memmove(sseq + 1, sseq, (freesseq - sseq) * sizeof(*sseq));
@@ -328,8 +330,7 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 		created_subseq = 1;
 	}
 
-	/* Insert a publication: */
-
+	/* Insert a publication */
 	publ = publ_create(type, lower, upper, scope, node, port, key);
 	if (!publ)
 		return NULL;
@@ -342,14 +343,12 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 		info->cluster_list_size++;
 	}
 
-	if (node == tipc_own_addr) {
+	if (in_own_node(node)) {
 		list_add(&publ->node_list, &info->node_list);
 		info->node_list_size++;
 	}
 
-	/*
-	 * Any subscriptions waiting for notification?
-	 */
+	/* Any subscriptions waiting for notification?  */
 	list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
 		tipc_subscr_report_overlap(s,
 					   publ->lower,
@@ -363,7 +362,7 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 }
 
 /**
- * tipc_nameseq_remove_publ -
+ * tipc_nameseq_remove_publ
  *
  * NOTE: There may be cases where TIPC is asked to remove a publication
  * that is not in the name table.  For example, if another node issues a
@@ -373,7 +372,6 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
  * A failed withdraw request simply returns a failure indication and lets the
  * caller issue any error or warning messages associated with such a problem.
  */
-
 static struct publication *tipc_nameseq_remove_publ(struct name_seq *nseq, u32 inst,
 						    u32 node, u32 ref, u32 key)
 {
@@ -390,7 +388,6 @@ static struct publication *tipc_nameseq_remove_publ(struct name_seq *nseq, u32 i
 	info = sseq->info;
 
 	/* Locate publication, if it exists */
-
 	list_for_each_entry(publ, &info->zone_list, zone_list) {
 		if ((publ->key == key) && (publ->ref == ref) &&
 		    (!publ->node || (publ->node == node)))
@@ -400,26 +397,22 @@ static struct publication *tipc_nameseq_remove_publ(struct name_seq *nseq, u32 i
 
 found:
 	/* Remove publication from zone scope list */
-
 	list_del(&publ->zone_list);
 	info->zone_list_size--;
 
 	/* Remove publication from cluster scope list, if present */
-
 	if (in_own_cluster(node)) {
 		list_del(&publ->cluster_list);
 		info->cluster_list_size--;
 	}
 
 	/* Remove publication from node scope list, if present */
-
-	if (node == tipc_own_addr) {
+	if (in_own_node(node)) {
 		list_del(&publ->node_list);
 		info->node_list_size--;
 	}
 
 	/* Contract subseq list if no more publications for that subseq */
-
 	if (list_empty(&info->zone_list)) {
 		kfree(info);
 		free = &nseq->sseqs[nseq->first_free--];
@@ -428,7 +421,6 @@ found:
 	}
 
 	/* Notify any waiting subscriptions */
-
 	list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
 		tipc_subscr_report_overlap(s,
 					   publ->lower,
@@ -447,7 +439,6 @@ found:
  * the prescribed number of events if there is any sub-
  * sequence overlapping with the requested sequence
  */
-
 static void tipc_nameseq_subscribe(struct name_seq *nseq,
 					struct tipc_subscription *s)
 {
@@ -499,9 +490,10 @@ struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
 {
 	struct name_seq *seq = nametbl_find_seq(type);
 
-	if (lower > upper) {
-		warn("Failed to publish illegal {%u,%u,%u}\n",
-		     type, lower, upper);
+	if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE) ||
+	    (lower > upper)) {
+		dbg("Failed to publish illegal {%u,%u,%u} with scope %u\n",
+		     type, lower, upper, scope);
 		return NULL;
 	}
 
@@ -524,22 +516,23 @@ struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower,
 		return NULL;
 
 	publ = tipc_nameseq_remove_publ(seq, lower, node, ref, key);
-
-	if (!seq->first_free && list_empty(&seq->subscriptions)) {
-		hlist_del_init(&seq->ns_list);
-		kfree(seq->sseqs);
-		kfree(seq);
-	}
+	nameseq_delete_empty(seq);
 	return publ;
 }
 
 /*
- * tipc_nametbl_translate - translate name to port id
+ * tipc_nametbl_translate - perform name translation
+ *
+ * On entry, 'destnode' is the search domain used during translation.
  *
- * Note: on entry 'destnode' is the search domain used during translation;
- *       on exit it passes back the node address of the matching port (if any)
+ * On exit:
+ * - if name translation is deferred to another node/cluster/zone,
+ *   leaves 'destnode' unchanged (will be non-zero) and returns 0
+ * - if name translation is attempted and succeeds, sets 'destnode'
+ *   to publishing node and returns port reference (will be non-zero)
+ * - if name translation is attempted and fails, sets 'destnode' to 0
+ *   and returns 0
  */
-
 u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
 {
 	struct sub_seq *sseq;
@@ -547,6 +540,7 @@ u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
 	struct publication *publ;
 	struct name_seq *seq;
 	u32 ref = 0;
+	u32 node = 0;
 
 	if (!tipc_in_scope(*destnode, tipc_own_addr))
 		return 0;
@@ -561,7 +555,7 @@ u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
 	spin_lock_bh(&seq->lock);
 	info = sseq->info;
 
-	/* Closest-First Algorithm: */
+	/* Closest-First Algorithm */
 	if (likely(!*destnode)) {
 		if (!list_empty(&info->node_list)) {
 			publ = list_first_entry(&info->node_list,
@@ -584,14 +578,14 @@ u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
 		}
 	}
 
-	/* Round-Robin Algorithm: */
+	/* Round-Robin Algorithm */
 	else if (*destnode == tipc_own_addr) {
 		if (list_empty(&info->node_list))
 			goto no_match;
 		publ = list_first_entry(&info->node_list, struct publication,
 					node_list);
 		list_move_tail(&publ->node_list, &info->node_list);
-	} else if (in_own_cluster(*destnode)) {
+	} else if (in_own_cluster_exact(*destnode)) {
 		if (list_empty(&info->cluster_list))
 			goto no_match;
 		publ = list_first_entry(&info->cluster_list, struct publication,
@@ -604,11 +598,12 @@ u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
 	}
 
 	ref = publ->ref;
-	*destnode = publ->node;
+	node = publ->node;
 no_match:
 	spin_unlock_bh(&seq->lock);
 not_found:
 	read_unlock_bh(&tipc_nametbl_lock);
+	*destnode = node;
 	return ref;
 }
 
@@ -624,7 +619,6 @@ not_found:
  *
  * Returns non-zero if any off-node ports overlap
  */
-
 int tipc_nametbl_mc_translate(u32 type, u32 lower, u32 upper, u32 limit,
 			      struct tipc_port_list *dports)
 {
@@ -665,25 +659,9 @@ exit:
 	return res;
 }
 
-/**
- * tipc_nametbl_publish_rsv - publish port name using a reserved name type
- */
-
-int tipc_nametbl_publish_rsv(u32 ref, unsigned int scope,
-			struct tipc_name_seq const *seq)
-{
-	int res;
-
-	atomic_inc(&rsv_publ_ok);
-	res = tipc_publish(ref, scope, seq);
-	atomic_dec(&rsv_publ_ok);
-	return res;
-}
-
-/**
+/*
  * tipc_nametbl_publish - add name publication to network name tables
  */
-
 struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
 				    u32 scope, u32 port_ref, u32 key)
 {
@@ -694,18 +672,14 @@ struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
 		     tipc_max_publications);
 		return NULL;
 	}
-	if ((type < TIPC_RESERVED_TYPES) && !atomic_read(&rsv_publ_ok)) {
-		warn("Publication failed, reserved name {%u,%u,%u}\n",
-		     type, lower, upper);
-		return NULL;
-	}
 
 	write_lock_bh(&tipc_nametbl_lock);
-	table.local_publ_count++;
 	publ = tipc_nametbl_insert_publ(type, lower, upper, scope,
 				   tipc_own_addr, port_ref, key);
-	if (publ && (scope != TIPC_NODE_SCOPE))
+	if (likely(publ)) {
+		table.local_publ_count++;
 		tipc_named_publish(publ);
+	}
 	write_unlock_bh(&tipc_nametbl_lock);
 	return publ;
 }
@@ -713,7 +687,6 @@ struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
 /**
  * tipc_nametbl_withdraw - withdraw name publication from network name tables
  */
-
 int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key)
 {
 	struct publication *publ;
@@ -722,8 +695,7 @@ int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key)
 	publ = tipc_nametbl_remove_publ(type, lower, tipc_own_addr, ref, key);
 	if (likely(publ)) {
 		table.local_publ_count--;
-		if (publ->scope != TIPC_NODE_SCOPE)
-			tipc_named_withdraw(publ);
+		tipc_named_withdraw(publ);
 		write_unlock_bh(&tipc_nametbl_lock);
 		list_del_init(&publ->pport_list);
 		kfree(publ);
@@ -739,7 +711,6 @@ int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key)
 /**
  * tipc_nametbl_subscribe - add a subscription object to the name table
  */
-
 void tipc_nametbl_subscribe(struct tipc_subscription *s)
 {
 	u32 type = s->seq.type;
@@ -763,7 +734,6 @@ void tipc_nametbl_subscribe(struct tipc_subscription *s)
 /**
  * tipc_nametbl_unsubscribe - remove a subscription object from name table
  */
-
 void tipc_nametbl_unsubscribe(struct tipc_subscription *s)
 {
 	struct name_seq *seq;
@@ -774,11 +744,7 @@ void tipc_nametbl_unsubscribe(struct tipc_subscription *s)
 		spin_lock_bh(&seq->lock);
 		list_del_init(&s->nameseq_list);
 		spin_unlock_bh(&seq->lock);
-		if ((seq->first_free == 0) && list_empty(&seq->subscriptions)) {
-			hlist_del_init(&seq->ns_list);
-			kfree(seq->sseqs);
-			kfree(seq);
-		}
+		nameseq_delete_empty(seq);
 	}
 	write_unlock_bh(&tipc_nametbl_lock);
 }
@@ -787,7 +753,6 @@ void tipc_nametbl_unsubscribe(struct tipc_subscription *s)
 /**
  * subseq_list: print specified sub-sequence contents into the given buffer
  */
-
 static void subseq_list(struct sub_seq *sseq, struct print_buf *buf, u32 depth,
 			u32 index)
 {
@@ -824,7 +789,6 @@ static void subseq_list(struct sub_seq *sseq, struct print_buf *buf, u32 depth,
 /**
  * nameseq_list: print specified name sequence contents into the given buffer
  */
-
 static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth,
 			 u32 type, u32 lowbound, u32 upbound, u32 index)
 {
@@ -855,7 +819,6 @@ static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth,
 /**
  * nametbl_header - print name table header into the given buffer
  */
-
 static void nametbl_header(struct print_buf *buf, u32 depth)
 {
 	const char *header[] = {
@@ -877,7 +840,6 @@ static void nametbl_header(struct print_buf *buf, u32 depth)
 /**
  * nametbl_list - print specified name table contents into the given buffer
  */
-
 static void nametbl_list(struct print_buf *buf, u32 depth_info,
 			 u32 type, u32 lowbound, u32 upbound)
 {
@@ -976,7 +938,6 @@ void tipc_nametbl_stop(void)
 		return;
 
 	/* Verify name table is empty, then release it */
-
 	write_lock_bh(&tipc_nametbl_lock);
 	for (i = 0; i < tipc_nametbl_size; i++) {
 		if (!hlist_empty(&table.types[i]))
@@ -986,4 +947,3 @@ void tipc_nametbl_stop(void)
 	table.types = NULL;
 	write_unlock_bh(&tipc_nametbl_lock);
 }
-