fs/ocfs2/cluster/nodemanager.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2004, 2005 Oracle.  All rights reserved.
   4  */
   5
   6 #include <linux/slab.h>
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/configfs.h>
  10
  11 #include "tcp.h"
  12 #include "nodemanager.h"
  13 #include "heartbeat.h"
  14 #include "masklog.h"
  15 #include "sys.h"
  16
  17 /* for now we operate under the assertion that there can be only one
  18  * cluster active at a time.  Changing this will require trickling
  19  * cluster references throughout where nodes are looked up */
  20 struct o2nm_cluster *o2nm_single_cluster = NULL;
  21
  22 static const char *o2nm_fence_method_desc[O2NM_FENCE_METHODS] = {
  23         "reset",        /* O2NM_FENCE_RESET */
  24         "panic",        /* O2NM_FENCE_PANIC */
  25 };
  26
  27 static inline void o2nm_lock_subsystem(void);
  28 static inline void o2nm_unlock_subsystem(void);
  29
  30 struct o2nm_node *o2nm_get_node_by_num(u8 node_num)
  31 {
  32         struct o2nm_node *node = NULL;
  33
  34         if (node_num >= O2NM_MAX_NODES || o2nm_single_cluster == NULL)
  35                 goto out;
  36
  37         read_lock(&o2nm_single_cluster->cl_nodes_lock);
  38         node = o2nm_single_cluster->cl_nodes[node_num];
  39         if (node)
  40                 config_item_get(&node->nd_item);
  41         read_unlock(&o2nm_single_cluster->cl_nodes_lock);
  42 out:
  43         return node;
  44 }
  45 EXPORT_SYMBOL_GPL(o2nm_get_node_by_num);
  46
  47 int o2nm_configured_node_map(unsigned long *map, unsigned bytes)
  48 {
  49         struct o2nm_cluster *cluster = o2nm_single_cluster;
  50
  51         BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap)));
  52
  53         if (cluster == NULL)
  54                 return -EINVAL;
  55
  56         read_lock(&cluster->cl_nodes_lock);
  57         bitmap_copy(map, cluster->cl_nodes_bitmap, O2NM_MAX_NODES);
  58         read_unlock(&cluster->cl_nodes_lock);
  59
  60         return 0;
  61 }
  62 EXPORT_SYMBOL_GPL(o2nm_configured_node_map);
  63
  64 static struct o2nm_node *o2nm_node_ip_tree_lookup(struct o2nm_cluster *cluster,
  65                                                   __be32 ip_needle,
  66                                                   struct rb_node ***ret_p,
  67                                                   struct rb_node **ret_parent)
  68 {
  69         struct rb_node **p = &cluster->cl_node_ip_tree.rb_node;
  70         struct rb_node *parent = NULL;
  71         struct o2nm_node *node, *ret = NULL;
  72
  73         while (*p) {
  74                 int cmp;
  75
  76                 parent = *p;
  77                 node = rb_entry(parent, struct o2nm_node, nd_ip_node);
  78
  79                 cmp = memcmp(&ip_needle, &node->nd_ipv4_address,
  80                                 sizeof(ip_needle));
  81                 if (cmp < 0)
  82                         p = &(*p)->rb_left;
  83                 else if (cmp > 0)
  84                         p = &(*p)->rb_right;
  85                 else {
  86                         ret = node;
  87                         break;
  88                 }
  89         }
  90
  91         if (ret_p != NULL)
  92                 *ret_p = p;
  93         if (ret_parent != NULL)
  94                 *ret_parent = parent;
  95
  96         return ret;
  97 }
  98
  99 struct o2nm_node *o2nm_get_node_by_ip(__be32 addr)
 100 {
 101         struct o2nm_node *node = NULL;
 102         struct o2nm_cluster *cluster = o2nm_single_cluster;
 103
 104         if (cluster == NULL)
 105                 goto out;
 106
 107         read_lock(&cluster->cl_nodes_lock);
 108         node = o2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL);
 109         if (node)
 110                 config_item_get(&node->nd_item);
 111         read_unlock(&cluster->cl_nodes_lock);
 112
 113 out:
 114         return node;
 115 }
 116 EXPORT_SYMBOL_GPL(o2nm_get_node_by_ip);
 117
 118 void o2nm_node_put(struct o2nm_node *node)
 119 {
 120         config_item_put(&node->nd_item);
 121 }
 122 EXPORT_SYMBOL_GPL(o2nm_node_put);
 123
 124 void o2nm_node_get(struct o2nm_node *node)
 125 {
 126         config_item_get(&node->nd_item);
 127 }
 128 EXPORT_SYMBOL_GPL(o2nm_node_get);
 129
 130 u8 o2nm_this_node(void)
 131 {
 132         u8 node_num = O2NM_MAX_NODES;
 133
 134         if (o2nm_single_cluster && o2nm_single_cluster->cl_has_local)
 135                 node_num = o2nm_single_cluster->cl_local_node;
 136
 137         return node_num;
 138 }
 139 EXPORT_SYMBOL_GPL(o2nm_this_node);
 140
 141 /* node configfs bits */
 142
 143 static struct o2nm_cluster *to_o2nm_cluster(struct config_item *item)
 144 {
 145         return item ?
 146                 container_of(to_config_group(item), struct o2nm_cluster,
 147                              cl_group)
 148                 : NULL;
 149 }
 150
 151 static struct o2nm_node *to_o2nm_node(struct config_item *item)
 152 {
 153         return item ? container_of(item, struct o2nm_node, nd_item) : NULL;
 154 }
 155
 156 static void o2nm_node_release(struct config_item *item)
 157 {
 158         struct o2nm_node *node = to_o2nm_node(item);
 159         kfree(node);
 160 }
 161
 162 static ssize_t o2nm_node_num_show(struct config_item *item, char *page)
 163 {
 164         return sprintf(page, "%d\n", to_o2nm_node(item)->nd_num);
 165 }
 166
 167 static struct o2nm_cluster *to_o2nm_cluster_from_node(struct o2nm_node *node)
 168 {
 169         /* through the first node_set .parent
 170          * mycluster/nodes/mynode == o2nm_cluster->o2nm_node_group->o2nm_node */
 171         if (node->nd_item.ci_parent)
 172                 return to_o2nm_cluster(node->nd_item.ci_parent->ci_parent);
 173         else
 174                 return NULL;
 175 }
 176
 177 enum {
 178         O2NM_NODE_ATTR_NUM = 0,
 179         O2NM_NODE_ATTR_PORT,
 180         O2NM_NODE_ATTR_ADDRESS,
 181 };
 182
 183 static ssize_t o2nm_node_num_store(struct config_item *item, const char *page,
 184                                    size_t count)
 185 {
 186         struct o2nm_node *node = to_o2nm_node(item);
 187         struct o2nm_cluster *cluster;
 188         unsigned long tmp;
 189         char *p = (char *)page;
 190         int ret = 0;
 191
 192         tmp = simple_strtoul(p, &p, 0);
 193         if (!p || (*p && (*p != '\n')))
 194                 return -EINVAL;
 195
 196         if (tmp >= O2NM_MAX_NODES)
 197                 return -ERANGE;
 198
 199         /* once we're in the cl_nodes tree networking can look us up by
 200          * node number and try to use our address and port attributes
 201          * to connect to this node.. make sure that they've been set
 202          * before writing the node attribute? */
 203         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 204             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 205                 return -EINVAL; /* XXX */
 206
 207         o2nm_lock_subsystem();
 208         cluster = to_o2nm_cluster_from_node(node);
 209         if (!cluster) {
 210                 o2nm_unlock_subsystem();
 211                 return -EINVAL;
 212         }
 213
 214         write_lock(&cluster->cl_nodes_lock);
 215         if (cluster->cl_nodes[tmp])
 216                 ret = -EEXIST;
 217         else if (test_and_set_bit(O2NM_NODE_ATTR_NUM,
 218                         &node->nd_set_attributes))
 219                 ret = -EBUSY;
 220         else  {
 221                 cluster->cl_nodes[tmp] = node;
 222                 node->nd_num = tmp;
 223                 set_bit(tmp, cluster->cl_nodes_bitmap);
 224         }
 225         write_unlock(&cluster->cl_nodes_lock);
 226         o2nm_unlock_subsystem();
 227
 228         if (ret)
 229                 return ret;
 230
 231         return count;
 232 }
 233 static ssize_t o2nm_node_ipv4_port_show(struct config_item *item, char *page)
 234 {
 235         return sprintf(page, "%u\n", ntohs(to_o2nm_node(item)->nd_ipv4_port));
 236 }
 237
 238 static ssize_t o2nm_node_ipv4_port_store(struct config_item *item,
 239                                          const char *page, size_t count)
 240 {
 241         struct o2nm_node *node = to_o2nm_node(item);
 242         unsigned long tmp;
 243         char *p = (char *)page;
 244
 245         tmp = simple_strtoul(p, &p, 0);
 246         if (!p || (*p && (*p != '\n')))
 247                 return -EINVAL;
 248
 249         if (tmp == 0)
 250                 return -EINVAL;
 251         if (tmp >= (u16)-1)
 252                 return -ERANGE;
 253
 254         if (test_and_set_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 255                 return -EBUSY;
 256         node->nd_ipv4_port = htons(tmp);
 257
 258         return count;
 259 }
 260
 261 static ssize_t o2nm_node_ipv4_address_show(struct config_item *item, char *page)
 262 {
 263         return sprintf(page, "%pI4\n", &to_o2nm_node(item)->nd_ipv4_address);
 264 }
 265
 266 static ssize_t o2nm_node_ipv4_address_store(struct config_item *item,
 267                                             const char *page,
 268                                             size_t count)
 269 {
 270         struct o2nm_node *node = to_o2nm_node(item);
 271         struct o2nm_cluster *cluster;
 272         int ret, i;
 273         struct rb_node **p, *parent;
 274         unsigned int octets[4];
 275         __be32 ipv4_addr = 0;
 276
 277         ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2],
 278                      &octets[1], &octets[0]);
 279         if (ret != 4)
 280                 return -EINVAL;
 281
 282         for (i = 0; i < ARRAY_SIZE(octets); i++) {
 283                 if (octets[i] > 255)
 284                         return -ERANGE;
 285                 be32_add_cpu(&ipv4_addr, octets[i] << (i * 8));
 286         }
 287
 288         o2nm_lock_subsystem();
 289         cluster = to_o2nm_cluster_from_node(node);
 290         if (!cluster) {
 291                 o2nm_unlock_subsystem();
 292                 return -EINVAL;
 293         }
 294
 295         ret = 0;
 296         write_lock(&cluster->cl_nodes_lock);
 297         if (o2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent))
 298                 ret = -EEXIST;
 299         else if (test_and_set_bit(O2NM_NODE_ATTR_ADDRESS,
 300                         &node->nd_set_attributes))
 301                 ret = -EBUSY;
 302         else {
 303                 rb_link_node(&node->nd_ip_node, parent, p);
 304                 rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 305         }
 306         write_unlock(&cluster->cl_nodes_lock);
 307         o2nm_unlock_subsystem();
 308
 309         if (ret)
 310                 return ret;
 311
 312         memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr));
 313
 314         return count;
 315 }
 316
 317 static ssize_t o2nm_node_local_show(struct config_item *item, char *page)
 318 {
 319         return sprintf(page, "%d\n", to_o2nm_node(item)->nd_local);
 320 }
 321
 322 static ssize_t o2nm_node_local_store(struct config_item *item, const char *page,
 323                                      size_t count)
 324 {
 325         struct o2nm_node *node = to_o2nm_node(item);
 326         struct o2nm_cluster *cluster;
 327         unsigned long tmp;
 328         char *p = (char *)page;
 329         ssize_t ret;
 330
 331         tmp = simple_strtoul(p, &p, 0);
 332         if (!p || (*p && (*p != '\n')))
 333                 return -EINVAL;
 334
 335         tmp = !!tmp; /* boolean of whether this node wants to be local */
 336
 337         /* setting local turns on networking rx for now so we require having
 338          * set everything else first */
 339         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 340             !test_bit(O2NM_NODE_ATTR_NUM, &node->nd_set_attributes) ||
 341             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 342                 return -EINVAL; /* XXX */
 343
 344         o2nm_lock_subsystem();
 345         cluster = to_o2nm_cluster_from_node(node);
 346         if (!cluster) {
 347                 ret = -EINVAL;
 348                 goto out;
 349         }
 350
 351         /* the only failure case is trying to set a new local node
 352          * when a different one is already set */
 353         if (tmp && tmp == cluster->cl_has_local &&
 354             cluster->cl_local_node != node->nd_num) {
 355                 ret = -EBUSY;
 356                 goto out;
 357         }
 358
 359         /* bring up the rx thread if we're setting the new local node. */
 360         if (tmp && !cluster->cl_has_local) {
 361                 ret = o2net_start_listening(node);
 362                 if (ret)
 363                         goto out;
 364         }
 365
 366         if (!tmp && cluster->cl_has_local &&
 367             cluster->cl_local_node == node->nd_num) {
 368                 o2net_stop_listening(node);
 369                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 370         }
 371
 372         node->nd_local = tmp;
 373         if (node->nd_local) {
 374                 cluster->cl_has_local = tmp;
 375                 cluster->cl_local_node = node->nd_num;
 376         }
 377
 378         ret = count;
 379
 380 out:
 381         o2nm_unlock_subsystem();
 382         return ret;
 383 }
 384
 385 CONFIGFS_ATTR(o2nm_node_, num);
 386 CONFIGFS_ATTR(o2nm_node_, ipv4_port);
 387 CONFIGFS_ATTR(o2nm_node_, ipv4_address);
 388 CONFIGFS_ATTR(o2nm_node_, local);
 389
 390 static struct configfs_attribute *o2nm_node_attrs[] = {
 391         &o2nm_node_attr_num,
 392         &o2nm_node_attr_ipv4_port,
 393         &o2nm_node_attr_ipv4_address,
 394         &o2nm_node_attr_local,
 395         NULL,
 396 };
 397
 398 static struct configfs_item_operations o2nm_node_item_ops = {
 399         .release                = o2nm_node_release,
 400 };
 401
 402 static const struct config_item_type o2nm_node_type = {
 403         .ct_item_ops    = &o2nm_node_item_ops,
 404         .ct_attrs       = o2nm_node_attrs,
 405         .ct_owner       = THIS_MODULE,
 406 };
 407
 408 /* node set */
 409
 410 struct o2nm_node_group {
 411         struct config_group ns_group;
 412         /* some stuff? */
 413 };
 414
 415 #if 0
 416 static struct o2nm_node_group *to_o2nm_node_group(struct config_group *group)
 417 {
 418         return group ?
 419                 container_of(group, struct o2nm_node_group, ns_group)
 420                 : NULL;
 421 }
 422 #endif
 423
 424 static ssize_t o2nm_cluster_attr_write(const char *page, ssize_t count,
 425                                        unsigned int *val)
 426 {
 427         unsigned long tmp;
 428         char *p = (char *)page;
 429
 430         tmp = simple_strtoul(p, &p, 0);
 431         if (!p || (*p && (*p != '\n')))
 432                 return -EINVAL;
 433
 434         if (tmp == 0)
 435                 return -EINVAL;
 436         if (tmp >= (u32)-1)
 437                 return -ERANGE;
 438
 439         *val = tmp;
 440
 441         return count;
 442 }
 443
 444 static ssize_t o2nm_cluster_idle_timeout_ms_show(struct config_item *item,
 445         char *page)
 446 {
 447         return sprintf(page, "%u\n", to_o2nm_cluster(item)->cl_idle_timeout_ms);
 448 }
 449
 450 static ssize_t o2nm_cluster_idle_timeout_ms_store(struct config_item *item,
 451         const char *page, size_t count)
 452 {
 453         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 454         ssize_t ret;
 455         unsigned int val;
 456
 457         ret =  o2nm_cluster_attr_write(page, count, &val);
 458
 459         if (ret > 0) {
 460                 if (cluster->cl_idle_timeout_ms != val
 461                         && o2net_num_connected_peers()) {
 462                         mlog(ML_NOTICE,
 463                              "o2net: cannot change idle timeout after "
 464                              "the first peer has agreed to it."
 465                              "  %d connected peers\n",
 466                              o2net_num_connected_peers());
 467                         ret = -EINVAL;
 468                 } else if (val <= cluster->cl_keepalive_delay_ms) {
 469                         mlog(ML_NOTICE, "o2net: idle timeout must be larger "
 470                              "than keepalive delay\n");
 471                         ret = -EINVAL;
 472                 } else {
 473                         cluster->cl_idle_timeout_ms = val;
 474                 }
 475         }
 476
 477         return ret;
 478 }
 479
 480 static ssize_t o2nm_cluster_keepalive_delay_ms_show(
 481         struct config_item *item, char *page)
 482 {
 483         return sprintf(page, "%u\n",
 484                         to_o2nm_cluster(item)->cl_keepalive_delay_ms);
 485 }
 486
 487 static ssize_t o2nm_cluster_keepalive_delay_ms_store(
 488         struct config_item *item, const char *page, size_t count)
 489 {
 490         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 491         ssize_t ret;
 492         unsigned int val;
 493
 494         ret =  o2nm_cluster_attr_write(page, count, &val);
 495
 496         if (ret > 0) {
 497                 if (cluster->cl_keepalive_delay_ms != val
 498                     && o2net_num_connected_peers()) {
 499                         mlog(ML_NOTICE,
 500                              "o2net: cannot change keepalive delay after"
 501                              " the first peer has agreed to it."
 502                              "  %d connected peers\n",
 503                              o2net_num_connected_peers());
 504                         ret = -EINVAL;
 505                 } else if (val >= cluster->cl_idle_timeout_ms) {
 506                         mlog(ML_NOTICE, "o2net: keepalive delay must be "
 507                              "smaller than idle timeout\n");
 508                         ret = -EINVAL;
 509                 } else {
 510                         cluster->cl_keepalive_delay_ms = val;
 511                 }
 512         }
 513
 514         return ret;
 515 }
 516
 517 static ssize_t o2nm_cluster_reconnect_delay_ms_show(
 518         struct config_item *item, char *page)
 519 {
 520         return sprintf(page, "%u\n",
 521                         to_o2nm_cluster(item)->cl_reconnect_delay_ms);
 522 }
 523
 524 static ssize_t o2nm_cluster_reconnect_delay_ms_store(
 525         struct config_item *item, const char *page, size_t count)
 526 {
 527         return o2nm_cluster_attr_write(page, count,
 528                                &to_o2nm_cluster(item)->cl_reconnect_delay_ms);
 529 }
 530
 531 static ssize_t o2nm_cluster_fence_method_show(
 532         struct config_item *item, char *page)
 533 {
 534         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 535         ssize_t ret = 0;
 536
 537         if (cluster)
 538                 ret = sprintf(page, "%s\n",
 539                               o2nm_fence_method_desc[cluster->cl_fence_method]);
 540         return ret;
 541 }
 542
 543 static ssize_t o2nm_cluster_fence_method_store(
 544         struct config_item *item, const char *page, size_t count)
 545 {
 546         unsigned int i;
 547
 548         if (page[count - 1] != '\n')
 549                 goto bail;
 550
 551         for (i = 0; i < O2NM_FENCE_METHODS; ++i) {
 552                 if (count != strlen(o2nm_fence_method_desc[i]) + 1)
 553                         continue;
 554                 if (strncasecmp(page, o2nm_fence_method_desc[i], count - 1))
 555                         continue;
 556                 if (to_o2nm_cluster(item)->cl_fence_method != i) {
 557                         printk(KERN_INFO "ocfs2: Changing fence method to %s\n",
 558                                o2nm_fence_method_desc[i]);
 559                         to_o2nm_cluster(item)->cl_fence_method = i;
 560                 }
 561                 return count;
 562         }
 563
 564 bail:
 565         return -EINVAL;
 566 }
 567
 568 CONFIGFS_ATTR(o2nm_cluster_, idle_timeout_ms);
 569 CONFIGFS_ATTR(o2nm_cluster_, keepalive_delay_ms);
 570 CONFIGFS_ATTR(o2nm_cluster_, reconnect_delay_ms);
 571 CONFIGFS_ATTR(o2nm_cluster_, fence_method);
 572
 573 static struct configfs_attribute *o2nm_cluster_attrs[] = {
 574         &o2nm_cluster_attr_idle_timeout_ms,
 575         &o2nm_cluster_attr_keepalive_delay_ms,
 576         &o2nm_cluster_attr_reconnect_delay_ms,
 577         &o2nm_cluster_attr_fence_method,
 578         NULL,
 579 };
 580
 581 static struct config_item *o2nm_node_group_make_item(struct config_group *group,
 582                                                      const char *name)
 583 {
 584         struct o2nm_node *node = NULL;
 585
 586         if (strlen(name) > O2NM_MAX_NAME_LEN)
 587                 return ERR_PTR(-ENAMETOOLONG);
 588
 589         node = kzalloc(sizeof(struct o2nm_node), GFP_KERNEL);
 590         if (node == NULL)
 591                 return ERR_PTR(-ENOMEM);
 592
 593         strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
 594         config_item_init_type_name(&node->nd_item, name, &o2nm_node_type);
 595         spin_lock_init(&node->nd_lock);
 596
 597         mlog(ML_CLUSTER, "o2nm: Registering node %s\n", name);
 598
 599         return &node->nd_item;
 600 }
 601
 602 static void o2nm_node_group_drop_item(struct config_group *group,
 603                                       struct config_item *item)
 604 {
 605         struct o2nm_node *node = to_o2nm_node(item);
 606         struct o2nm_cluster *cluster = to_o2nm_cluster(group->cg_item.ci_parent);
 607
 608         if (cluster->cl_nodes[node->nd_num] == node) {
 609                 o2net_disconnect_node(node);
 610
 611                 if (cluster->cl_has_local &&
 612                     (cluster->cl_local_node == node->nd_num)) {
 613                         cluster->cl_has_local = 0;
 614                         cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 615                         o2net_stop_listening(node);
 616                 }
 617         }
 618
 619         /* XXX call into net to stop this node from trading messages */
 620
 621         write_lock(&cluster->cl_nodes_lock);
 622
 623         /* XXX sloppy */
 624         if (node->nd_ipv4_address)
 625                 rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 626
 627         /* nd_num might be 0 if the node number hasn't been set.. */
 628         if (cluster->cl_nodes[node->nd_num] == node) {
 629                 cluster->cl_nodes[node->nd_num] = NULL;
 630                 clear_bit(node->nd_num, cluster->cl_nodes_bitmap);
 631         }
 632         write_unlock(&cluster->cl_nodes_lock);
 633
 634         mlog(ML_CLUSTER, "o2nm: Unregistered node %s\n",
 635              config_item_name(&node->nd_item));
 636
 637         config_item_put(item);
 638 }
 639
 640 static struct configfs_group_operations o2nm_node_group_group_ops = {
 641         .make_item      = o2nm_node_group_make_item,
 642         .drop_item      = o2nm_node_group_drop_item,
 643 };
 644
 645 static const struct config_item_type o2nm_node_group_type = {
 646         .ct_group_ops   = &o2nm_node_group_group_ops,
 647         .ct_owner       = THIS_MODULE,
 648 };
 649
 650 /* cluster */
 651
 652 static void o2nm_cluster_release(struct config_item *item)
 653 {
 654         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 655
 656         kfree(cluster);
 657 }
 658
 659 static struct configfs_item_operations o2nm_cluster_item_ops = {
 660         .release        = o2nm_cluster_release,
 661 };
 662
 663 static const struct config_item_type o2nm_cluster_type = {
 664         .ct_item_ops    = &o2nm_cluster_item_ops,
 665         .ct_attrs       = o2nm_cluster_attrs,
 666         .ct_owner       = THIS_MODULE,
 667 };
 668
 669 /* cluster set */
 670
 671 struct o2nm_cluster_group {
 672         struct configfs_subsystem cs_subsys;
 673         /* some stuff? */
 674 };
 675
 676 #if 0
 677 static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *group)
 678 {
 679         return group ?
 680                 container_of(to_configfs_subsystem(group), struct o2nm_cluster_group, cs_subsys)
 681                : NULL;
 682 }
 683 #endif
 684
 685 static struct config_group *o2nm_cluster_group_make_group(struct config_group *group,
 686                                                           const char *name)
 687 {
 688         struct o2nm_cluster *cluster = NULL;
 689         struct o2nm_node_group *ns = NULL;
 690         struct config_group *o2hb_group = NULL, *ret = NULL;
 691
 692         /* this runs under the parent dir's i_rwsem; there can be only
 693          * one caller in here at a time */
 694         if (o2nm_single_cluster)
 695                 return ERR_PTR(-ENOSPC);
 696
 697         cluster = kzalloc(sizeof(struct o2nm_cluster), GFP_KERNEL);
 698         ns = kzalloc(sizeof(struct o2nm_node_group), GFP_KERNEL);
 699         o2hb_group = o2hb_alloc_hb_set();
 700         if (cluster == NULL || ns == NULL || o2hb_group == NULL)
 701                 goto out;
 702
 703         config_group_init_type_name(&cluster->cl_group, name,
 704                                     &o2nm_cluster_type);
 705         configfs_add_default_group(&ns->ns_group, &cluster->cl_group);
 706
 707         config_group_init_type_name(&ns->ns_group, "node",
 708                                     &o2nm_node_group_type);
 709         configfs_add_default_group(o2hb_group, &cluster->cl_group);
 710
 711         rwlock_init(&cluster->cl_nodes_lock);
 712         cluster->cl_node_ip_tree = RB_ROOT;
 713         cluster->cl_reconnect_delay_ms = O2NET_RECONNECT_DELAY_MS_DEFAULT;
 714         cluster->cl_idle_timeout_ms    = O2NET_IDLE_TIMEOUT_MS_DEFAULT;
 715         cluster->cl_keepalive_delay_ms = O2NET_KEEPALIVE_DELAY_MS_DEFAULT;
 716         cluster->cl_fence_method       = O2NM_FENCE_RESET;
 717
 718         ret = &cluster->cl_group;
 719         o2nm_single_cluster = cluster;
 720
 721 out:
 722         if (ret == NULL) {
 723                 kfree(cluster);
 724                 kfree(ns);
 725                 o2hb_free_hb_set(o2hb_group);
 726                 ret = ERR_PTR(-ENOMEM);
 727         }
 728
 729         return ret;
 730 }
 731
 732 static void o2nm_cluster_group_drop_item(struct config_group *group, struct config_item *item)
 733 {
 734         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 735
 736         BUG_ON(o2nm_single_cluster != cluster);
 737         o2nm_single_cluster = NULL;
 738
 739         configfs_remove_default_groups(&cluster->cl_group);
 740         config_item_put(item);
 741 }
 742
 743 static struct configfs_group_operations o2nm_cluster_group_group_ops = {
 744         .make_group     = o2nm_cluster_group_make_group,
 745         .drop_item      = o2nm_cluster_group_drop_item,
 746 };
 747
 748 static const struct config_item_type o2nm_cluster_group_type = {
 749         .ct_group_ops   = &o2nm_cluster_group_group_ops,
 750         .ct_owner       = THIS_MODULE,
 751 };
 752
 753 static struct o2nm_cluster_group o2nm_cluster_group = {
 754         .cs_subsys = {
 755                 .su_group = {
 756                         .cg_item = {
 757                                 .ci_namebuf = "cluster",
 758                                 .ci_type = &o2nm_cluster_group_type,
 759                         },
 760                 },
 761         },
 762 };
 763
 764 static inline void o2nm_lock_subsystem(void)
 765 {
 766         mutex_lock(&o2nm_cluster_group.cs_subsys.su_mutex);
 767 }
 768
 769 static inline void o2nm_unlock_subsystem(void)
 770 {
 771         mutex_unlock(&o2nm_cluster_group.cs_subsys.su_mutex);
 772 }
 773
 774 int o2nm_depend_item(struct config_item *item)
 775 {
 776         return configfs_depend_item(&o2nm_cluster_group.cs_subsys, item);
 777 }
 778
 779 void o2nm_undepend_item(struct config_item *item)
 780 {
 781         configfs_undepend_item(item);
 782 }
 783
 784 int o2nm_depend_this_node(void)
 785 {
 786         int ret = 0;
 787         struct o2nm_node *local_node;
 788
 789         local_node = o2nm_get_node_by_num(o2nm_this_node());
 790         if (!local_node) {
 791                 ret = -EINVAL;
 792                 goto out;
 793         }
 794
 795         ret = o2nm_depend_item(&local_node->nd_item);
 796         o2nm_node_put(local_node);
 797
 798 out:
 799         return ret;
 800 }
 801
 802 void o2nm_undepend_this_node(void)
 803 {
 804         struct o2nm_node *local_node;
 805
 806         local_node = o2nm_get_node_by_num(o2nm_this_node());
 807         BUG_ON(!local_node);
 808
 809         o2nm_undepend_item(&local_node->nd_item);
 810         o2nm_node_put(local_node);
 811 }
 812
 813
 814 static void __exit exit_o2nm(void)
 815 {
 816         /* XXX sync with hb callbacks and shut down hb? */
 817         o2net_unregister_hb_callbacks();
 818         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 819         o2cb_sys_shutdown();
 820
 821         o2net_exit();
 822         o2hb_exit();
 823 }
 824
 825 static int __init init_o2nm(void)
 826 {
 827         int ret;
 828
 829         o2hb_init();
 830
 831         ret = o2net_init();
 832         if (ret)
 833                 goto out_o2hb;
 834
 835         ret = o2net_register_hb_callbacks();
 836         if (ret)
 837                 goto out_o2net;
 838
 839         config_group_init(&o2nm_cluster_group.cs_subsys.su_group);
 840         mutex_init(&o2nm_cluster_group.cs_subsys.su_mutex);
 841         ret = configfs_register_subsystem(&o2nm_cluster_group.cs_subsys);
 842         if (ret) {
 843                 printk(KERN_ERR "nodemanager: Registration returned %d\n", ret);
 844                 goto out_callbacks;
 845         }
 846
 847         ret = o2cb_sys_init();
 848         if (!ret)
 849                 goto out;
 850
 851         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 852 out_callbacks:
 853         o2net_unregister_hb_callbacks();
 854 out_o2net:
 855         o2net_exit();
 856 out_o2hb:
 857         o2hb_exit();
 858 out:
 859         return ret;
 860 }
 861
 862 MODULE_AUTHOR("Oracle");
 863 MODULE_LICENSE("GPL");
 864 MODULE_DESCRIPTION("OCFS2 cluster management");
 865
 866 module_init(init_o2nm)
 867 module_exit(exit_o2nm)