Merge branch 'master' of /usr/src/ntfs-2.6/

1 files changed, 1079 insertions, 0 deletions

diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
new file mode 100644
index 000000000000..3f4b23bd08f7
--- /dev/null
+++ b/net/tipc/name_table.c
@@ -0,0 +1,1079 @@
+/*
+ * net/tipc/name_table.c: TIPC name table code
+ * 
+ * Copyright (c) 2000-2006, Ericsson AB
+ * Copyright (c) 2004-2005, Wind River Systems
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core.h"
+#include "config.h"
+#include "dbg.h"
+#include "name_table.h"
+#include "name_distr.h"
+#include "addr.h"
+#include "node_subscr.h"
+#include "subscr.h"
+#include "port.h"
+#include "cluster.h"
+#include "bcast.h"
+
+int tipc_nametbl_size = 1024;           /* must be a power of 2 */
+
+/**
+ * struct sub_seq - container for all published instances of a name sequence
+ * @lower: name sequence lower bound
+ * @upper: name sequence upper bound
+ * @node_list: circular list of matching publications with >= node scope
+ * @cluster_list: circular list of matching publications with >= cluster scope
+ * @zone_list: circular list of matching publications with >= zone scope
+ */
+
+struct sub_seq {
+        u32 lower;
+        u32 upper;
+        struct publication *node_list;
+        struct publication *cluster_list;
+        struct publication *zone_list;
+};
+
+/** 
+ * struct name_seq - container for all published instances of a name type
+ * @type: 32 bit 'type' value for name sequence
+ * @sseq: pointer to dynamically-sized array of sub-sequences of this 'type';
+ *        sub-sequences are sorted in ascending order
+ * @alloc: number of sub-sequences currently in array
+ * @first_free: upper bound of highest sub-sequence + 1
+ * @ns_list: links to adjacent name sequences in hash chain
+ * @subscriptions: list of subscriptions for this 'type'
+ * @lock: spinlock controlling access to name sequence structure
+ */
+
+struct name_seq {
+        u32 type;
+        struct sub_seq *sseqs;
+        u32 alloc;
+        u32 first_free;
+        struct hlist_node ns_list;
+        struct list_head subscriptions;
+        spinlock_t lock;
+};
+
+/**
+ * struct name_table - table containing all existing port name publications
+ * @types: pointer to fixed-sized array of name sequence lists, 
+ *         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 = { NULL } ;
+static atomic_t rsv_publ_ok = ATOMIC_INIT(0);
+rwlock_t tipc_nametbl_lock = RW_LOCK_UNLOCKED;
+
+
+static inline int hash(int x)
+{
+        return(x & (tipc_nametbl_size - 1));
+}
+
+/**
+ * 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)
+{
+        struct publication *publ =
+                (struct publication *)kmalloc(sizeof(*publ), GFP_ATOMIC);
+        if (publ == NULL) {
+                warn("Memory squeeze; failed to create publication\n");
+                return 0;
+        }
+
+        memset(publ, 0, sizeof(*publ));
+        publ->type = type;
+        publ->lower = lower;
+        publ->upper = upper;
+        publ->scope = scope;
+        publ->node = node;
+        publ->ref = port_ref;
+        publ->key = key;
+        INIT_LIST_HEAD(&publ->local_list);
+        INIT_LIST_HEAD(&publ->pport_list);
+        INIT_LIST_HEAD(&publ->subscr.nodesub_list);
+        return publ;
+}
+
+/**
+ * tipc_subseq_alloc - allocate a specified number of sub-sequence structures
+ */
+
+struct sub_seq *tipc_subseq_alloc(u32 cnt)
+{
+        u32 sz = cnt * sizeof(struct sub_seq);
+        struct sub_seq *sseq = (struct sub_seq *)kmalloc(sz, GFP_ATOMIC);
+
+        if (sseq)
+                memset(sseq, 0, sz);
+        return sseq;
+}
+
+/**
+ * tipc_nameseq_create - create a name sequence structure for the specified 'type'
+ * 
+ * Allocates a single sub-sequence structure and sets it to all 0's.
+ */
+
+struct name_seq *tipc_nameseq_create(u32 type, struct hlist_head *seq_head)
+{
+        struct name_seq *nseq = 
+                (struct name_seq *)kmalloc(sizeof(*nseq), GFP_ATOMIC);
+        struct sub_seq *sseq = tipc_subseq_alloc(1);
+
+        if (!nseq || !sseq) {
+                warn("Memory squeeze; failed to create name sequence\n");
+                kfree(nseq);
+                kfree(sseq);
+                return 0;
+        }
+
+        memset(nseq, 0, sizeof(*nseq));
+        nseq->lock = SPIN_LOCK_UNLOCKED;
+        nseq->type = type;
+        nseq->sseqs = sseq;
+        dbg("tipc_nameseq_create() nseq = %x type %u, ssseqs %x, ff: %u\n",
+            nseq, type, nseq->sseqs, nseq->first_free);
+        nseq->alloc = 1;
+        INIT_HLIST_NODE(&nseq->ns_list);
+        INIT_LIST_HEAD(&nseq->subscriptions);
+        hlist_add_head(&nseq->ns_list, seq_head);
+        return nseq;
+}
+
+/**
+ * nameseq_find_subseq - find sub-sequence (if any) matching a name instance
+ *  
+ * Very time-critical, so binary searches through sub-sequence array.
+ */
+
+static inline struct sub_seq *nameseq_find_subseq(struct name_seq *nseq, 
+                                                  u32 instance)
+{
+        struct sub_seq *sseqs = nseq->sseqs;
+        int low = 0;
+        int high = nseq->first_free - 1;
+        int mid;
+
+        while (low <= high) {
+                mid = (low + high) / 2;
+                if (instance < sseqs[mid].lower)
+                        high = mid - 1;
+                else if (instance > sseqs[mid].upper)
+                        low = mid + 1;
+                else
+                        return &sseqs[mid];
+        }
+        return 0;
+}
+
+/**
+ * nameseq_locate_subseq - determine position of name instance in sub-sequence
+ * 
+ * Returns index in sub-sequence array of the entry that contains the specified
+ * instance value; if no entry contains that value, returns the position
+ * where a new entry for it would be inserted in the array.
+ *
+ * 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;
+        int low = 0;
+        int high = nseq->first_free - 1;
+        int mid;
+
+        while (low <= high) {
+                mid = (low + high) / 2;
+                if (instance < sseqs[mid].lower)
+                        high = mid - 1;
+                else if (instance > sseqs[mid].upper)
+                        low = mid + 1;
+                else
+                        return mid;
+        }
+        return low;
+}
+
+/**
+ * tipc_nameseq_insert_publ - 
+ */
+
+struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
+                                        u32 type, u32 lower, u32 upper,
+                                        u32 scope, u32 node, u32 port, u32 key)
+{
+        struct subscription *s;
+        struct subscription *st;
+        struct publication *publ;
+        struct sub_seq *sseq;
+        int created_subseq = 0;
+
+        assert(nseq->first_free <= nseq->alloc);
+        sseq = nameseq_find_subseq(nseq, lower);
+        dbg("nameseq_ins: for seq %x,<%u,%u>, found sseq %x\n",
+            nseq, type, lower, sseq);
+        if (sseq) {
+
+                /* Lower end overlaps existing entry => need an exact match */
+
+                if ((sseq->lower != lower) || (sseq->upper != upper)) {
+                        warn("Overlapping publ <%u,%u,%u>\n", type, lower, upper);
+                        return 0;
+                }
+        } 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("Overlapping publ <%u,%u,%u>\n", type, lower, upper);
+                        return 0;
+                }
+
+                /* Ensure there is space for new sub-sequence */
+
+                if (nseq->first_free == nseq->alloc) {
+                        struct sub_seq *sseqs = nseq->sseqs;
+                        nseq->sseqs = tipc_subseq_alloc(nseq->alloc * 2);
+                        if (nseq->sseqs != NULL) {
+                                memcpy(nseq->sseqs, sseqs,
+                                       nseq->alloc * sizeof (struct sub_seq));
+                                kfree(sseqs);
+                                dbg("Allocated %u sseqs\n", nseq->alloc);
+                                nseq->alloc *= 2;
+                        } else {
+                                warn("Memory squeeze; failed to create sub-sequence\n");
+                                return 0;
+                        }
+                }
+                dbg("Have %u sseqs for type %u\n", nseq->alloc, type);
+
+                /* Insert new sub-sequence */
+
+                dbg("ins in pos %u, ff = %u\n", inspos, nseq->first_free);
+                sseq = &nseq->sseqs[inspos];
+                freesseq = &nseq->sseqs[nseq->first_free];
+                memmove(sseq + 1, sseq, (freesseq - sseq) * sizeof (*sseq));
+                memset(sseq, 0, sizeof (*sseq));
+                nseq->first_free++;
+                sseq->lower = lower;
+                sseq->upper = upper;
+                created_subseq = 1;
+        }
+        dbg("inserting (%u %u %u) from %x:%u into sseq %x(%u,%u) of seq %x\n",
+            type, lower, upper, node, port, sseq,
+            sseq->lower, sseq->upper, nseq);
+
+        /* Insert a publication: */
+
+        publ = publ_create(type, lower, upper, scope, node, port, key);
+        if (!publ)
+                return 0;
+        dbg("inserting publ %x, node=%x publ->node=%x, subscr->node=%x\n",
+            publ, node, publ->node, publ->subscr.node);
+
+        if (!sseq->zone_list)
+                sseq->zone_list = publ->zone_list_next = publ;
+        else {
+                publ->zone_list_next = sseq->zone_list->zone_list_next;
+                sseq->zone_list->zone_list_next = publ;
+        }
+
+        if (in_own_cluster(node)) {
+                if (!sseq->cluster_list)
+                        sseq->cluster_list = publ->cluster_list_next = publ;
+                else {
+                        publ->cluster_list_next =
+                        sseq->cluster_list->cluster_list_next;
+                        sseq->cluster_list->cluster_list_next = publ;
+                }
+        }
+
+        if (node == tipc_own_addr) {
+                if (!sseq->node_list)
+                        sseq->node_list = publ->node_list_next = publ;
+                else {
+                        publ->node_list_next = sseq->node_list->node_list_next;
+                        sseq->node_list->node_list_next = publ;
+                }
+        }
+
+        /* 
+         * Any subscriptions waiting for notification? 
+         */
+        list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
+                dbg("calling report_overlap()\n");
+                tipc_subscr_report_overlap(s,
+                                           publ->lower,
+                                           publ->upper,
+                                           TIPC_PUBLISHED,
+                                           publ->ref, 
+                                           publ->node,
+                                           created_subseq);
+        }
+        return publ;
+}
+
+/**
+ * tipc_nameseq_remove_publ -
+ */
+
+struct publication *tipc_nameseq_remove_publ(struct name_seq *nseq, u32 inst,
+                                             u32 node, u32 ref, u32 key)
+{
+        struct publication *publ;
+        struct publication *prev;
+        struct sub_seq *sseq = nameseq_find_subseq(nseq, inst);
+        struct sub_seq *free;
+        struct subscription *s, *st;
+        int removed_subseq = 0;
+
+        assert(nseq);
+
+        if (!sseq) {
+                int i;
+
+                warn("Withdraw unknown <%u,%u>?\n", nseq->type, inst);
+                assert(nseq->sseqs);
+                dbg("Dumping subseqs %x for %x, alloc = %u,ff=%u\n",
+                    nseq->sseqs, nseq, nseq->alloc, 
+                    nseq->first_free);
+                for (i = 0; i < nseq->first_free; i++) {
+                        dbg("Subseq %u(%x): lower = %u,upper = %u\n",
+                            i, &nseq->sseqs[i], nseq->sseqs[i].lower,
+                            nseq->sseqs[i].upper);
+                }
+                return 0;
+        }
+        dbg("nameseq_remove: seq: %x, sseq %x, <%u,%u> key %u\n",
+            nseq, sseq, nseq->type, inst, key);
+
+        prev = sseq->zone_list;
+        publ = sseq->zone_list->zone_list_next;
+        while ((publ->key != key) || (publ->ref != ref) || 
+               (publ->node && (publ->node != node))) {
+                prev = publ;
+                publ = publ->zone_list_next;
+                assert(prev != sseq->zone_list);
+        }
+        if (publ != sseq->zone_list)
+                prev->zone_list_next = publ->zone_list_next;
+        else if (publ->zone_list_next != publ) {
+                prev->zone_list_next = publ->zone_list_next;
+                sseq->zone_list = publ->zone_list_next;
+        } else {
+                sseq->zone_list = 0;
+        }
+
+        if (in_own_cluster(node)) {
+                prev = sseq->cluster_list;
+                publ = sseq->cluster_list->cluster_list_next;
+                while ((publ->key != key) || (publ->ref != ref) || 
+                       (publ->node && (publ->node != node))) {
+                        prev = publ;
+                        publ = publ->cluster_list_next;
+                        assert(prev != sseq->cluster_list);
+                }
+                if (publ != sseq->cluster_list)
+                        prev->cluster_list_next = publ->cluster_list_next;
+                else if (publ->cluster_list_next != publ) {
+                        prev->cluster_list_next = publ->cluster_list_next;
+                        sseq->cluster_list = publ->cluster_list_next;
+                } else {
+                        sseq->cluster_list = 0;
+                }
+        }
+
+        if (node == tipc_own_addr) {
+                prev = sseq->node_list;
+                publ = sseq->node_list->node_list_next;
+                while ((publ->key != key) || (publ->ref != ref) || 
+                       (publ->node && (publ->node != node))) {
+                        prev = publ;
+                        publ = publ->node_list_next;
+                        assert(prev != sseq->node_list);
+                }
+                if (publ != sseq->node_list)
+                        prev->node_list_next = publ->node_list_next;
+                else if (publ->node_list_next != publ) {
+                        prev->node_list_next = publ->node_list_next;
+                        sseq->node_list = publ->node_list_next;
+                } else {
+                        sseq->node_list = 0;
+                }
+        }
+        assert(!publ->node || (publ->node == node));
+        assert(publ->ref == ref);
+        assert(publ->key == key);
+
+        /* 
+         * Contract subseq list if no more publications:
+         */
+        if (!sseq->node_list && !sseq->cluster_list && !sseq->zone_list) {
+                free = &nseq->sseqs[nseq->first_free--];
+                memmove(sseq, sseq + 1, (free - (sseq + 1)) * sizeof (*sseq));
+                removed_subseq = 1;
+        }
+
+        /* 
+         * Any subscriptions waiting ? 
+         */
+        list_for_each_entry_safe(s, st, &nseq->subscriptions, nameseq_list) {
+                tipc_subscr_report_overlap(s,
+                                           publ->lower,
+                                           publ->upper,
+                                           TIPC_WITHDRAWN, 
+                                           publ->ref, 
+                                           publ->node,
+                                           removed_subseq);
+        }
+        return publ;
+}
+
+/**
+ * tipc_nameseq_subscribe: attach a subscription, and issue
+ * the prescribed number of events if there is any sub-
+ * sequence overlapping with the requested sequence
+ */
+
+void tipc_nameseq_subscribe(struct name_seq *nseq, struct subscription *s)
+{
+        struct sub_seq *sseq = nseq->sseqs;
+
+        list_add(&s->nameseq_list, &nseq->subscriptions);
+
+        if (!sseq)
+                return;
+
+        while (sseq != &nseq->sseqs[nseq->first_free]) {
+                struct publication *zl = sseq->zone_list;
+                if (zl && tipc_subscr_overlap(s,sseq->lower,sseq->upper)) {
+                        struct publication *crs = zl;
+                        int must_report = 1;
+
+                        do {
+                                tipc_subscr_report_overlap(s, 
+                                                           sseq->lower, 
+                                                           sseq->upper,
+                                                           TIPC_PUBLISHED,
+                                                           crs->ref,
+                                                           crs->node,
+                                                           must_report);
+                                must_report = 0;
+                                crs = crs->zone_list_next;
+                        } while (crs != zl);
+                }
+                sseq++;
+        }
+}
+
+static struct name_seq *nametbl_find_seq(u32 type)
+{
+        struct hlist_head *seq_head;
+        struct hlist_node *seq_node;
+        struct name_seq *ns;
+
+        dbg("find_seq %u,(%u,0x%x) table = %p, hash[type] = %u\n",
+            type, ntohl(type), type, table.types, hash(type));
+
+        seq_head = &table.types[hash(type)];
+        hlist_for_each_entry(ns, seq_node, seq_head, ns_list) {
+                if (ns->type == type) {
+                        dbg("found %x\n", ns);
+                        return ns;
+                }
+        }
+
+        return 0;
+};
+
+struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
+                                             u32 scope, u32 node, u32 port, u32 key)
+{
+        struct name_seq *seq = nametbl_find_seq(type);
+
+        dbg("ins_publ: <%u,%x,%x> found %x\n", type, lower, upper, seq);
+        if (lower > upper) {
+                warn("Failed to publish illegal <%u,%u,%u>\n",
+                     type, lower, upper);
+                return 0;
+        }
+
+        dbg("Publishing <%u,%u,%u> from %x\n", type, lower, upper, node);
+        if (!seq) {
+                seq = tipc_nameseq_create(type, &table.types[hash(type)]);
+                dbg("tipc_nametbl_insert_publ: created %x\n", seq);
+        }
+        if (!seq)
+                return 0;
+
+        assert(seq->type == type);
+        return tipc_nameseq_insert_publ(seq, type, lower, upper,
+                                        scope, node, port, key);
+}
+
+struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower, 
+                                             u32 node, u32 ref, u32 key)
+{
+        struct publication *publ;
+        struct name_seq *seq = nametbl_find_seq(type);
+
+        if (!seq)
+                return 0;
+
+        dbg("Withdrawing <%u,%u> from %x\n", type, lower, node);
+        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);
+        }
+        return publ;
+}
+
+/*
+ * tipc_nametbl_translate(): Translate tipc_name -> tipc_portid.
+ *                      Very time-critical.
+ *
+ * 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)
+ */
+
+u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *destnode)
+{
+        struct sub_seq *sseq;
+        struct publication *publ = 0;
+        struct name_seq *seq;
+        u32 ref;
+
+        if (!in_scope(*destnode, tipc_own_addr))
+                return 0;
+
+        read_lock_bh(&tipc_nametbl_lock);
+        seq = nametbl_find_seq(type);
+        if (unlikely(!seq))
+                goto not_found;
+        sseq = nameseq_find_subseq(seq, instance);
+        if (unlikely(!sseq))
+                goto not_found;
+        spin_lock_bh(&seq->lock);
+
+        /* Closest-First Algorithm: */
+        if (likely(!*destnode)) {
+                publ = sseq->node_list;
+                if (publ) {
+                        sseq->node_list = publ->node_list_next;
+found:
+                        ref = publ->ref;
+                        *destnode = publ->node;
+                        spin_unlock_bh(&seq->lock);
+                        read_unlock_bh(&tipc_nametbl_lock);
+                        return ref;
+                }
+                publ = sseq->cluster_list;
+                if (publ) {
+                        sseq->cluster_list = publ->cluster_list_next;
+                        goto found;
+                }
+                publ = sseq->zone_list;
+                if (publ) {
+                        sseq->zone_list = publ->zone_list_next;
+                        goto found;
+                }
+        }
+
+        /* Round-Robin Algorithm: */
+        else if (*destnode == tipc_own_addr) {
+                publ = sseq->node_list;
+                if (publ) {
+                        sseq->node_list = publ->node_list_next;
+                        goto found;
+                }
+        } else if (in_own_cluster(*destnode)) {
+                publ = sseq->cluster_list;
+                if (publ) {
+                        sseq->cluster_list = publ->cluster_list_next;
+                        goto found;
+                }
+        } else {
+                publ = sseq->zone_list;
+                if (publ) {
+                        sseq->zone_list = publ->zone_list_next;
+                        goto found;
+                }
+        }
+        spin_unlock_bh(&seq->lock);
+not_found:
+        *destnode = 0;
+        read_unlock_bh(&tipc_nametbl_lock);
+        return 0;
+}
+
+/**
+ * tipc_nametbl_mc_translate - find multicast destinations
+ * 
+ * Creates list of all local ports that overlap the given multicast address;
+ * also determines if any off-node ports overlap.
+ *
+ * Note: Publications with a scope narrower than 'limit' are ignored.
+ * (i.e. local node-scope publications mustn't receive messages arriving
+ * from another node, even if the multcast link brought it here)
+ * 
+ * Returns non-zero if any off-node ports overlap
+ */
+
+int tipc_nametbl_mc_translate(u32 type, u32 lower, u32 upper, u32 limit,
+                              struct port_list *dports)
+{
+        struct name_seq *seq;
+        struct sub_seq *sseq;
+        struct sub_seq *sseq_stop;
+        int res = 0;
+
+        read_lock_bh(&tipc_nametbl_lock);
+        seq = nametbl_find_seq(type);
+        if (!seq)
+                goto exit;
+
+        spin_lock_bh(&seq->lock);
+
+        sseq = seq->sseqs + nameseq_locate_subseq(seq, lower);
+        sseq_stop = seq->sseqs + seq->first_free;
+        for (; sseq != sseq_stop; sseq++) {
+                struct publication *publ;
+
+                if (sseq->lower > upper)
+                        break;
+                publ = sseq->cluster_list;
+                if (publ && (publ->scope <= limit))
+                        do {
+                                if (publ->node == tipc_own_addr)
+                                        tipc_port_list_add(dports, publ->ref);
+                                else
+                                        res = 1;
+                                publ = publ->cluster_list_next;
+                        } while (publ != sseq->cluster_list);
+        }
+
+        spin_unlock_bh(&seq->lock);
+exit:
+        read_unlock_bh(&tipc_nametbl_lock);
+        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)
+{
+        struct publication *publ;
+
+        if (table.local_publ_count >= tipc_max_publications) {
+                warn("Failed publish: max %u local publication\n", 
+                     tipc_max_publications);
+                return 0;
+        }
+        if ((type < TIPC_RESERVED_TYPES) && !atomic_read(&rsv_publ_ok)) {
+                warn("Failed to publish reserved name <%u,%u,%u>\n",
+                     type, lower, upper);
+                return 0;
+        }
+
+        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)) {
+                tipc_named_publish(publ);
+        }
+        write_unlock_bh(&tipc_nametbl_lock);
+        return publ;
+}
+
+/**
+ * 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;
+
+        dbg("tipc_nametbl_withdraw:<%d,%d,%d>\n", type, lower, key);
+        write_lock_bh(&tipc_nametbl_lock);
+        publ = tipc_nametbl_remove_publ(type, lower, tipc_own_addr, ref, key);
+        if (publ) {
+                table.local_publ_count--;
+                if (publ->scope != TIPC_NODE_SCOPE)
+                        tipc_named_withdraw(publ);
+                write_unlock_bh(&tipc_nametbl_lock);
+                list_del_init(&publ->pport_list);
+                kfree(publ);
+                return 1;
+        }
+        write_unlock_bh(&tipc_nametbl_lock);
+        return 0;
+}
+
+/**
+ * tipc_nametbl_subscribe - add a subscription object to the name table
+ */
+
+void
+tipc_nametbl_subscribe(struct subscription *s)
+{
+        u32 type = s->seq.type;
+        struct name_seq *seq;
+
+        write_lock_bh(&tipc_nametbl_lock);
+        seq = nametbl_find_seq(type);
+        if (!seq) {
+                seq = tipc_nameseq_create(type, &table.types[hash(type)]);
+        }
+        if (seq){
+                spin_lock_bh(&seq->lock);
+                dbg("tipc_nametbl_subscribe:found %x for <%u,%u,%u>\n",
+                    seq, type, s->seq.lower, s->seq.upper);
+                assert(seq->type == type);
+                tipc_nameseq_subscribe(seq, s);
+                spin_unlock_bh(&seq->lock);
+        }
+        write_unlock_bh(&tipc_nametbl_lock);
+}
+
+/**
+ * tipc_nametbl_unsubscribe - remove a subscription object from name table
+ */
+
+void
+tipc_nametbl_unsubscribe(struct subscription *s)
+{
+        struct name_seq *seq;
+
+        write_lock_bh(&tipc_nametbl_lock);
+        seq = nametbl_find_seq(s->seq.type);
+        if (seq != NULL){
+                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);
+                }
+        }
+        write_unlock_bh(&tipc_nametbl_lock);
+}
+
+
+/**
+ * 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)
+{
+        char portIdStr[27];
+        char *scopeStr;
+        struct publication *publ = sseq->zone_list;
+
+        tipc_printf(buf, "%-10u %-10u ", sseq->lower, sseq->upper);
+
+        if (depth == 2 || !publ) {
+                tipc_printf(buf, "\n");
+                return;
+        }
+
+        do {
+                sprintf (portIdStr, "<%u.%u.%u:%u>",
+                         tipc_zone(publ->node), tipc_cluster(publ->node),
+                         tipc_node(publ->node), publ->ref);
+                tipc_printf(buf, "%-26s ", portIdStr);
+                if (depth > 3) {
+                        if (publ->node != tipc_own_addr)
+                                scopeStr = "";
+                        else if (publ->scope == TIPC_NODE_SCOPE)
+                                scopeStr = "node";
+                        else if (publ->scope == TIPC_CLUSTER_SCOPE)
+                                scopeStr = "cluster";
+                        else
+                                scopeStr = "zone";
+                        tipc_printf(buf, "%-10u %s", publ->key, scopeStr);
+                }
+
+                publ = publ->zone_list_next;
+                if (publ == sseq->zone_list)
+                        break;
+
+                tipc_printf(buf, "\n%33s", " ");
+        } while (1);
+
+        tipc_printf(buf, "\n");
+}
+
+/**
+ * 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)
+{
+        struct sub_seq *sseq;
+        char typearea[11];
+
+        sprintf(typearea, "%-10u", seq->type);
+
+        if (depth == 1) {
+                tipc_printf(buf, "%s\n", typearea);
+                return;
+        }
+
+        for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) {
+                if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) {
+                        tipc_printf(buf, "%s ", typearea);
+                        subseq_list(sseq, buf, depth, index);
+                        sprintf(typearea, "%10s", " ");
+                }
+        }
+}
+
+/**
+ * nametbl_header - print name table header into the given buffer
+ */
+
+static void nametbl_header(struct print_buf *buf, u32 depth)
+{
+        tipc_printf(buf, "Type       ");
+
+        if (depth > 1)
+                tipc_printf(buf, "Lower      Upper      ");
+        if (depth > 2)
+                tipc_printf(buf, "Port Identity              ");
+        if (depth > 3)
+                tipc_printf(buf, "Publication");
+
+        tipc_printf(buf, "\n-----------");
+
+        if (depth > 1)
+                tipc_printf(buf, "--------------------- ");
+        if (depth > 2)
+                tipc_printf(buf, "-------------------------- ");
+        if (depth > 3)
+                tipc_printf(buf, "------------------");
+
+        tipc_printf(buf, "\n");
+}
+
+/**
+ * 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)
+{
+        struct hlist_head *seq_head;
+        struct hlist_node *seq_node;
+        struct name_seq *seq;
+        int all_types;
+        u32 depth;
+        u32 i;
+
+        all_types = (depth_info & TIPC_NTQ_ALLTYPES);
+        depth = (depth_info & ~TIPC_NTQ_ALLTYPES);
+
+        if (depth == 0)
+                return;
+
+        if (all_types) {
+                /* display all entries in name table to specified depth */
+                nametbl_header(buf, depth);
+                lowbound = 0;
+                upbound = ~0;
+                for (i = 0; i < tipc_nametbl_size; i++) {
+                        seq_head = &table.types[i];
+                        hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
+                                nameseq_list(seq, buf, depth, seq->type, 
+                                             lowbound, upbound, i);
+                        }
+                }
+        } else {
+                /* display only the sequence that matches the specified type */
+                if (upbound < lowbound) {
+                        tipc_printf(buf, "invalid name sequence specified\n");
+                        return;
+                }
+                nametbl_header(buf, depth);
+                i = hash(type);
+                seq_head = &table.types[i];
+                hlist_for_each_entry(seq, seq_node, seq_head, ns_list) {
+                        if (seq->type == type) {
+                                nameseq_list(seq, buf, depth, type, 
+                                             lowbound, upbound, i);
+                                break;
+                        }
+                }
+        }
+}
+
+void tipc_nametbl_print(struct print_buf *buf, const char *str)
+{
+        tipc_printf(buf, str);
+        read_lock_bh(&tipc_nametbl_lock);
+        nametbl_list(buf, 0, 0, 0, 0);
+        read_unlock_bh(&tipc_nametbl_lock);
+}
+
+#define MAX_NAME_TBL_QUERY 32768
+
+struct sk_buff *tipc_nametbl_get(const void *req_tlv_area, int req_tlv_space)
+{
+        struct sk_buff *buf;
+        struct tipc_name_table_query *argv;
+        struct tlv_desc *rep_tlv;
+        struct print_buf b;
+        int str_len;
+
+        if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NAME_TBL_QUERY))
+                return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+        buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_NAME_TBL_QUERY));
+        if (!buf)
+                return NULL;
+
+        rep_tlv = (struct tlv_desc *)buf->data;
+        tipc_printbuf_init(&b, TLV_DATA(rep_tlv), MAX_NAME_TBL_QUERY);
+        argv = (struct tipc_name_table_query *)TLV_DATA(req_tlv_area);
+        read_lock_bh(&tipc_nametbl_lock);
+        nametbl_list(&b, ntohl(argv->depth), ntohl(argv->type), 
+                     ntohl(argv->lowbound), ntohl(argv->upbound));
+        read_unlock_bh(&tipc_nametbl_lock);
+        str_len = tipc_printbuf_validate(&b);
+
+        skb_put(buf, TLV_SPACE(str_len));
+        TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
+
+        return buf;
+}
+
+void tipc_nametbl_dump(void)
+{
+        nametbl_list(TIPC_CONS, 0, 0, 0, 0);
+}
+
+int tipc_nametbl_init(void)
+{
+        int array_size = sizeof(struct hlist_head) * tipc_nametbl_size;
+
+        table.types = (struct hlist_head *)kmalloc(array_size, GFP_ATOMIC);
+        if (!table.types)
+                return -ENOMEM;
+
+        write_lock_bh(&tipc_nametbl_lock);
+        memset(table.types, 0, array_size);
+        table.local_publ_count = 0;
+        write_unlock_bh(&tipc_nametbl_lock);
+        return 0;
+}
+
+void tipc_nametbl_stop(void)
+{
+        struct hlist_head *seq_head;
+        struct hlist_node *seq_node;
+        struct hlist_node *tmp;
+        struct name_seq *seq;
+        u32 i;
+
+        if (!table.types)
+                return;
+
+        write_lock_bh(&tipc_nametbl_lock);
+        for (i = 0; i < tipc_nametbl_size; i++) {
+                seq_head = &table.types[i];
+                hlist_for_each_entry_safe(seq, seq_node, tmp, seq_head, ns_list) {
+                        struct sub_seq *sseq = seq->sseqs;
+
+                        for (; sseq != &seq->sseqs[seq->first_free]; sseq++) {
+                                struct publication *publ = sseq->zone_list;
+                                assert(publ);
+                                do {
+                                        struct publication *next =
+                                                publ->zone_list_next;
+                                        kfree(publ);
+                                        publ = next;
+                                }
+                                while (publ != sseq->zone_list);
+                        }
+                }
+        }
+        kfree(table.types);
+        table.types = NULL;
+        write_unlock_bh(&tipc_nametbl_lock);
+}