fs/ocfs2/cluster/nodemanager.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * Copyright (C) 2004, 2005 Oracle.  All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public
  17  * License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA.
  20  */
  21
  22 #include <linux/slab.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/configfs.h>
  26
  27 #include "tcp.h"
  28 #include "nodemanager.h"
  29 #include "heartbeat.h"
  30 #include "masklog.h"
  31 #include "sys.h"
  32
  33 /* for now we operate under the assertion that there can be only one
  34  * cluster active at a time.  Changing this will require trickling
  35  * cluster references throughout where nodes are looked up */
  36 struct o2nm_cluster *o2nm_single_cluster = NULL;
  37
  38 char *o2nm_fence_method_desc[O2NM_FENCE_METHODS] = {
  39                 "reset",        /* O2NM_FENCE_RESET */
  40                 "panic",        /* O2NM_FENCE_PANIC */
  41 };
  42
  43 static inline void o2nm_lock_subsystem(void);
  44 static inline void o2nm_unlock_subsystem(void);
  45
  46 struct o2nm_node *o2nm_get_node_by_num(u8 node_num)
  47 {
  48         struct o2nm_node *node = NULL;
  49
  50         if (node_num >= O2NM_MAX_NODES || o2nm_single_cluster == NULL)
  51                 goto out;
  52
  53         read_lock(&o2nm_single_cluster->cl_nodes_lock);
  54         node = o2nm_single_cluster->cl_nodes[node_num];
  55         if (node)
  56                 config_item_get(&node->nd_item);
  57         read_unlock(&o2nm_single_cluster->cl_nodes_lock);
  58 out:
  59         return node;
  60 }
  61 EXPORT_SYMBOL_GPL(o2nm_get_node_by_num);
  62
  63 int o2nm_configured_node_map(unsigned long *map, unsigned bytes)
  64 {
  65         struct o2nm_cluster *cluster = o2nm_single_cluster;
  66
  67         BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap)));
  68
  69         if (cluster == NULL)
  70                 return -EINVAL;
  71
  72         read_lock(&cluster->cl_nodes_lock);
  73         memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap));
  74         read_unlock(&cluster->cl_nodes_lock);
  75
  76         return 0;
  77 }
  78 EXPORT_SYMBOL_GPL(o2nm_configured_node_map);
  79
  80 static struct o2nm_node *o2nm_node_ip_tree_lookup(struct o2nm_cluster *cluster,
  81                                                   __be32 ip_needle,
  82                                                   struct rb_node ***ret_p,
  83                                                   struct rb_node **ret_parent)
  84 {
  85         struct rb_node **p = &cluster->cl_node_ip_tree.rb_node;
  86         struct rb_node *parent = NULL;
  87         struct o2nm_node *node, *ret = NULL;
  88
  89         while (*p) {
  90                 int cmp;
  91
  92                 parent = *p;
  93                 node = rb_entry(parent, struct o2nm_node, nd_ip_node);
  94
  95                 cmp = memcmp(&ip_needle, &node->nd_ipv4_address,
  96                                 sizeof(ip_needle));
  97                 if (cmp < 0)
  98                         p = &(*p)->rb_left;
  99                 else if (cmp > 0)
 100                         p = &(*p)->rb_right;
 101                 else {
 102                         ret = node;
 103                         break;
 104                 }
 105         }
 106
 107         if (ret_p != NULL)
 108                 *ret_p = p;
 109         if (ret_parent != NULL)
 110                 *ret_parent = parent;
 111
 112         return ret;
 113 }
 114
 115 struct o2nm_node *o2nm_get_node_by_ip(__be32 addr)
 116 {
 117         struct o2nm_node *node = NULL;
 118         struct o2nm_cluster *cluster = o2nm_single_cluster;
 119
 120         if (cluster == NULL)
 121                 goto out;
 122
 123         read_lock(&cluster->cl_nodes_lock);
 124         node = o2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL);
 125         if (node)
 126                 config_item_get(&node->nd_item);
 127         read_unlock(&cluster->cl_nodes_lock);
 128
 129 out:
 130         return node;
 131 }
 132 EXPORT_SYMBOL_GPL(o2nm_get_node_by_ip);
 133
 134 void o2nm_node_put(struct o2nm_node *node)
 135 {
 136         config_item_put(&node->nd_item);
 137 }
 138 EXPORT_SYMBOL_GPL(o2nm_node_put);
 139
 140 void o2nm_node_get(struct o2nm_node *node)
 141 {
 142         config_item_get(&node->nd_item);
 143 }
 144 EXPORT_SYMBOL_GPL(o2nm_node_get);
 145
 146 u8 o2nm_this_node(void)
 147 {
 148         u8 node_num = O2NM_MAX_NODES;
 149
 150         if (o2nm_single_cluster && o2nm_single_cluster->cl_has_local)
 151                 node_num = o2nm_single_cluster->cl_local_node;
 152
 153         return node_num;
 154 }
 155 EXPORT_SYMBOL_GPL(o2nm_this_node);
 156
 157 /* node configfs bits */
 158
 159 static struct o2nm_cluster *to_o2nm_cluster(struct config_item *item)
 160 {
 161         return item ?
 162                 container_of(to_config_group(item), struct o2nm_cluster,
 163                              cl_group)
 164                 : NULL;
 165 }
 166
 167 static struct o2nm_node *to_o2nm_node(struct config_item *item)
 168 {
 169         return item ? container_of(item, struct o2nm_node, nd_item) : NULL;
 170 }
 171
 172 static void o2nm_node_release(struct config_item *item)
 173 {
 174         struct o2nm_node *node = to_o2nm_node(item);
 175         kfree(node);
 176 }
 177
 178 static ssize_t o2nm_node_num_show(struct config_item *item, char *page)
 179 {
 180         return sprintf(page, "%d\n", to_o2nm_node(item)->nd_num);
 181 }
 182
 183 static struct o2nm_cluster *to_o2nm_cluster_from_node(struct o2nm_node *node)
 184 {
 185         /* through the first node_set .parent
 186          * mycluster/nodes/mynode == o2nm_cluster->o2nm_node_group->o2nm_node */
 187         if (node->nd_item.ci_parent)
 188                 return to_o2nm_cluster(node->nd_item.ci_parent->ci_parent);
 189         else
 190                 return NULL;
 191 }
 192
 193 enum {
 194         O2NM_NODE_ATTR_NUM = 0,
 195         O2NM_NODE_ATTR_PORT,
 196         O2NM_NODE_ATTR_ADDRESS,
 197 };
 198
 199 static ssize_t o2nm_node_num_store(struct config_item *item, const char *page,
 200                                    size_t count)
 201 {
 202         struct o2nm_node *node = to_o2nm_node(item);
 203         struct o2nm_cluster *cluster;
 204         unsigned long tmp;
 205         char *p = (char *)page;
 206         int ret = 0;
 207
 208         tmp = simple_strtoul(p, &p, 0);
 209         if (!p || (*p && (*p != '\n')))
 210                 return -EINVAL;
 211
 212         if (tmp >= O2NM_MAX_NODES)
 213                 return -ERANGE;
 214
 215         /* once we're in the cl_nodes tree networking can look us up by
 216          * node number and try to use our address and port attributes
 217          * to connect to this node.. make sure that they've been set
 218          * before writing the node attribute? */
 219         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 220             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 221                 return -EINVAL; /* XXX */
 222
 223         o2nm_lock_subsystem();
 224         cluster = to_o2nm_cluster_from_node(node);
 225         if (!cluster) {
 226                 o2nm_unlock_subsystem();
 227                 return -EINVAL;
 228         }
 229
 230         write_lock(&cluster->cl_nodes_lock);
 231         if (cluster->cl_nodes[tmp])
 232                 ret = -EEXIST;
 233         else if (test_and_set_bit(O2NM_NODE_ATTR_NUM,
 234                         &node->nd_set_attributes))
 235                 ret = -EBUSY;
 236         else  {
 237                 cluster->cl_nodes[tmp] = node;
 238                 node->nd_num = tmp;
 239                 set_bit(tmp, cluster->cl_nodes_bitmap);
 240         }
 241         write_unlock(&cluster->cl_nodes_lock);
 242         o2nm_unlock_subsystem();
 243
 244         if (ret)
 245                 return ret;
 246
 247         return count;
 248 }
 249 static ssize_t o2nm_node_ipv4_port_show(struct config_item *item, char *page)
 250 {
 251         return sprintf(page, "%u\n", ntohs(to_o2nm_node(item)->nd_ipv4_port));
 252 }
 253
 254 static ssize_t o2nm_node_ipv4_port_store(struct config_item *item,
 255                                          const char *page, size_t count)
 256 {
 257         struct o2nm_node *node = to_o2nm_node(item);
 258         unsigned long tmp;
 259         char *p = (char *)page;
 260
 261         tmp = simple_strtoul(p, &p, 0);
 262         if (!p || (*p && (*p != '\n')))
 263                 return -EINVAL;
 264
 265         if (tmp == 0)
 266                 return -EINVAL;
 267         if (tmp >= (u16)-1)
 268                 return -ERANGE;
 269
 270         if (test_and_set_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 271                 return -EBUSY;
 272         node->nd_ipv4_port = htons(tmp);
 273
 274         return count;
 275 }
 276
 277 static ssize_t o2nm_node_ipv4_address_show(struct config_item *item, char *page)
 278 {
 279         return sprintf(page, "%pI4\n", &to_o2nm_node(item)->nd_ipv4_address);
 280 }
 281
 282 static ssize_t o2nm_node_ipv4_address_store(struct config_item *item,
 283                                             const char *page,
 284                                             size_t count)
 285 {
 286         struct o2nm_node *node = to_o2nm_node(item);
 287         struct o2nm_cluster *cluster;
 288         int ret, i;
 289         struct rb_node **p, *parent;
 290         unsigned int octets[4];
 291         __be32 ipv4_addr = 0;
 292
 293         ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2],
 294                      &octets[1], &octets[0]);
 295         if (ret != 4)
 296                 return -EINVAL;
 297
 298         for (i = 0; i < ARRAY_SIZE(octets); i++) {
 299                 if (octets[i] > 255)
 300                         return -ERANGE;
 301                 be32_add_cpu(&ipv4_addr, octets[i] << (i * 8));
 302         }
 303
 304         o2nm_lock_subsystem();
 305         cluster = to_o2nm_cluster_from_node(node);
 306         if (!cluster) {
 307                 o2nm_unlock_subsystem();
 308                 return -EINVAL;
 309         }
 310
 311         ret = 0;
 312         write_lock(&cluster->cl_nodes_lock);
 313         if (o2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent))
 314                 ret = -EEXIST;
 315         else if (test_and_set_bit(O2NM_NODE_ATTR_ADDRESS,
 316                         &node->nd_set_attributes))
 317                 ret = -EBUSY;
 318         else {
 319                 rb_link_node(&node->nd_ip_node, parent, p);
 320                 rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 321         }
 322         write_unlock(&cluster->cl_nodes_lock);
 323         o2nm_unlock_subsystem();
 324
 325         if (ret)
 326                 return ret;
 327
 328         memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr));
 329
 330         return count;
 331 }
 332
 333 static ssize_t o2nm_node_local_show(struct config_item *item, char *page)
 334 {
 335         return sprintf(page, "%d\n", to_o2nm_node(item)->nd_local);
 336 }
 337
 338 static ssize_t o2nm_node_local_store(struct config_item *item, const char *page,
 339                                      size_t count)
 340 {
 341         struct o2nm_node *node = to_o2nm_node(item);
 342         struct o2nm_cluster *cluster;
 343         unsigned long tmp;
 344         char *p = (char *)page;
 345         ssize_t ret;
 346
 347         tmp = simple_strtoul(p, &p, 0);
 348         if (!p || (*p && (*p != '\n')))
 349                 return -EINVAL;
 350
 351         tmp = !!tmp; /* boolean of whether this node wants to be local */
 352
 353         /* setting local turns on networking rx for now so we require having
 354          * set everything else first */
 355         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 356             !test_bit(O2NM_NODE_ATTR_NUM, &node->nd_set_attributes) ||
 357             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 358                 return -EINVAL; /* XXX */
 359
 360         o2nm_lock_subsystem();
 361         cluster = to_o2nm_cluster_from_node(node);
 362         if (!cluster) {
 363                 ret = -EINVAL;
 364                 goto out;
 365         }
 366
 367         /* the only failure case is trying to set a new local node
 368          * when a different one is already set */
 369         if (tmp && tmp == cluster->cl_has_local &&
 370             cluster->cl_local_node != node->nd_num) {
 371                 ret = -EBUSY;
 372                 goto out;
 373         }
 374
 375         /* bring up the rx thread if we're setting the new local node. */
 376         if (tmp && !cluster->cl_has_local) {
 377                 ret = o2net_start_listening(node);
 378                 if (ret)
 379                         goto out;
 380         }
 381
 382         if (!tmp && cluster->cl_has_local &&
 383             cluster->cl_local_node == node->nd_num) {
 384                 o2net_stop_listening(node);
 385                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 386         }
 387
 388         node->nd_local = tmp;
 389         if (node->nd_local) {
 390                 cluster->cl_has_local = tmp;
 391                 cluster->cl_local_node = node->nd_num;
 392         }
 393
 394         ret = count;
 395
 396 out:
 397         o2nm_unlock_subsystem();
 398         return ret;
 399 }
 400
 401 CONFIGFS_ATTR(o2nm_node_, num);
 402 CONFIGFS_ATTR(o2nm_node_, ipv4_port);
 403 CONFIGFS_ATTR(o2nm_node_, ipv4_address);
 404 CONFIGFS_ATTR(o2nm_node_, local);
 405
 406 static struct configfs_attribute *o2nm_node_attrs[] = {
 407         &o2nm_node_attr_num,
 408         &o2nm_node_attr_ipv4_port,
 409         &o2nm_node_attr_ipv4_address,
 410         &o2nm_node_attr_local,
 411         NULL,
 412 };
 413
 414 static struct configfs_item_operations o2nm_node_item_ops = {
 415         .release                = o2nm_node_release,
 416 };
 417
 418 static const struct config_item_type o2nm_node_type = {
 419         .ct_item_ops    = &o2nm_node_item_ops,
 420         .ct_attrs       = o2nm_node_attrs,
 421         .ct_owner       = THIS_MODULE,
 422 };
 423
 424 /* node set */
 425
 426 struct o2nm_node_group {
 427         struct config_group ns_group;
 428         /* some stuff? */
 429 };
 430
 431 #if 0
 432 static struct o2nm_node_group *to_o2nm_node_group(struct config_group *group)
 433 {
 434         return group ?
 435                 container_of(group, struct o2nm_node_group, ns_group)
 436                 : NULL;
 437 }
 438 #endif
 439
 440 static ssize_t o2nm_cluster_attr_write(const char *page, ssize_t count,
 441                                        unsigned int *val)
 442 {
 443         unsigned long tmp;
 444         char *p = (char *)page;
 445
 446         tmp = simple_strtoul(p, &p, 0);
 447         if (!p || (*p && (*p != '\n')))
 448                 return -EINVAL;
 449
 450         if (tmp == 0)
 451                 return -EINVAL;
 452         if (tmp >= (u32)-1)
 453                 return -ERANGE;
 454
 455         *val = tmp;
 456
 457         return count;
 458 }
 459
 460 static ssize_t o2nm_cluster_idle_timeout_ms_show(struct config_item *item,
 461         char *page)
 462 {
 463         return sprintf(page, "%u\n", to_o2nm_cluster(item)->cl_idle_timeout_ms);
 464 }
 465
 466 static ssize_t o2nm_cluster_idle_timeout_ms_store(struct config_item *item,
 467         const char *page, size_t count)
 468 {
 469         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 470         ssize_t ret;
 471         unsigned int val;
 472
 473         ret =  o2nm_cluster_attr_write(page, count, &val);
 474
 475         if (ret > 0) {
 476                 if (cluster->cl_idle_timeout_ms != val
 477                         && o2net_num_connected_peers()) {
 478                         mlog(ML_NOTICE,
 479                              "o2net: cannot change idle timeout after "
 480                              "the first peer has agreed to it."
 481                              "  %d connected peers\n",
 482                              o2net_num_connected_peers());
 483                         ret = -EINVAL;
 484                 } else if (val <= cluster->cl_keepalive_delay_ms) {
 485                         mlog(ML_NOTICE, "o2net: idle timeout must be larger "
 486                              "than keepalive delay\n");
 487                         ret = -EINVAL;
 488                 } else {
 489                         cluster->cl_idle_timeout_ms = val;
 490                 }
 491         }
 492
 493         return ret;
 494 }
 495
 496 static ssize_t o2nm_cluster_keepalive_delay_ms_show(
 497         struct config_item *item, char *page)
 498 {
 499         return sprintf(page, "%u\n",
 500                         to_o2nm_cluster(item)->cl_keepalive_delay_ms);
 501 }
 502
 503 static ssize_t o2nm_cluster_keepalive_delay_ms_store(
 504         struct config_item *item, const char *page, size_t count)
 505 {
 506         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 507         ssize_t ret;
 508         unsigned int val;
 509
 510         ret =  o2nm_cluster_attr_write(page, count, &val);
 511
 512         if (ret > 0) {
 513                 if (cluster->cl_keepalive_delay_ms != val
 514                     && o2net_num_connected_peers()) {
 515                         mlog(ML_NOTICE,
 516                              "o2net: cannot change keepalive delay after"
 517                              " the first peer has agreed to it."
 518                              "  %d connected peers\n",
 519                              o2net_num_connected_peers());
 520                         ret = -EINVAL;
 521                 } else if (val >= cluster->cl_idle_timeout_ms) {
 522                         mlog(ML_NOTICE, "o2net: keepalive delay must be "
 523                              "smaller than idle timeout\n");
 524                         ret = -EINVAL;
 525                 } else {
 526                         cluster->cl_keepalive_delay_ms = val;
 527                 }
 528         }
 529
 530         return ret;
 531 }
 532
 533 static ssize_t o2nm_cluster_reconnect_delay_ms_show(
 534         struct config_item *item, char *page)
 535 {
 536         return sprintf(page, "%u\n",
 537                         to_o2nm_cluster(item)->cl_reconnect_delay_ms);
 538 }
 539
 540 static ssize_t o2nm_cluster_reconnect_delay_ms_store(
 541         struct config_item *item, const char *page, size_t count)
 542 {
 543         return o2nm_cluster_attr_write(page, count,
 544                                &to_o2nm_cluster(item)->cl_reconnect_delay_ms);
 545 }
 546
 547 static ssize_t o2nm_cluster_fence_method_show(
 548         struct config_item *item, char *page)
 549 {
 550         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 551         ssize_t ret = 0;
 552
 553         if (cluster)
 554                 ret = sprintf(page, "%s\n",
 555                               o2nm_fence_method_desc[cluster->cl_fence_method]);
 556         return ret;
 557 }
 558
 559 static ssize_t o2nm_cluster_fence_method_store(
 560         struct config_item *item, const char *page, size_t count)
 561 {
 562         unsigned int i;
 563
 564         if (page[count - 1] != '\n')
 565                 goto bail;
 566
 567         for (i = 0; i < O2NM_FENCE_METHODS; ++i) {
 568                 if (count != strlen(o2nm_fence_method_desc[i]) + 1)
 569                         continue;
 570                 if (strncasecmp(page, o2nm_fence_method_desc[i], count - 1))
 571                         continue;
 572                 if (to_o2nm_cluster(item)->cl_fence_method != i) {
 573                         printk(KERN_INFO "ocfs2: Changing fence method to %s\n",
 574                                o2nm_fence_method_desc[i]);
 575                         to_o2nm_cluster(item)->cl_fence_method = i;
 576                 }
 577                 return count;
 578         }
 579
 580 bail:
 581         return -EINVAL;
 582 }
 583
 584 CONFIGFS_ATTR(o2nm_cluster_, idle_timeout_ms);
 585 CONFIGFS_ATTR(o2nm_cluster_, keepalive_delay_ms);
 586 CONFIGFS_ATTR(o2nm_cluster_, reconnect_delay_ms);
 587 CONFIGFS_ATTR(o2nm_cluster_, fence_method);
 588
 589 static struct configfs_attribute *o2nm_cluster_attrs[] = {
 590         &o2nm_cluster_attr_idle_timeout_ms,
 591         &o2nm_cluster_attr_keepalive_delay_ms,
 592         &o2nm_cluster_attr_reconnect_delay_ms,
 593         &o2nm_cluster_attr_fence_method,
 594         NULL,
 595 };
 596
 597 static struct config_item *o2nm_node_group_make_item(struct config_group *group,
 598                                                      const char *name)
 599 {
 600         struct o2nm_node *node = NULL;
 601
 602         if (strlen(name) > O2NM_MAX_NAME_LEN)
 603                 return ERR_PTR(-ENAMETOOLONG);
 604
 605         node = kzalloc(sizeof(struct o2nm_node), GFP_KERNEL);
 606         if (node == NULL)
 607                 return ERR_PTR(-ENOMEM);
 608
 609         strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
 610         config_item_init_type_name(&node->nd_item, name, &o2nm_node_type);
 611         spin_lock_init(&node->nd_lock);
 612
 613         mlog(ML_CLUSTER, "o2nm: Registering node %s\n", name);
 614
 615         return &node->nd_item;
 616 }
 617
 618 static void o2nm_node_group_drop_item(struct config_group *group,
 619                                       struct config_item *item)
 620 {
 621         struct o2nm_node *node = to_o2nm_node(item);
 622         struct o2nm_cluster *cluster = to_o2nm_cluster(group->cg_item.ci_parent);
 623
 624         o2net_disconnect_node(node);
 625
 626         if (cluster->cl_has_local &&
 627             (cluster->cl_local_node == node->nd_num)) {
 628                 cluster->cl_has_local = 0;
 629                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 630                 o2net_stop_listening(node);
 631         }
 632
 633         /* XXX call into net to stop this node from trading messages */
 634
 635         write_lock(&cluster->cl_nodes_lock);
 636
 637         /* XXX sloppy */
 638         if (node->nd_ipv4_address)
 639                 rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 640
 641         /* nd_num might be 0 if the node number hasn't been set.. */
 642         if (cluster->cl_nodes[node->nd_num] == node) {
 643                 cluster->cl_nodes[node->nd_num] = NULL;
 644                 clear_bit(node->nd_num, cluster->cl_nodes_bitmap);
 645         }
 646         write_unlock(&cluster->cl_nodes_lock);
 647
 648         mlog(ML_CLUSTER, "o2nm: Unregistered node %s\n",
 649              config_item_name(&node->nd_item));
 650
 651         config_item_put(item);
 652 }
 653
 654 static struct configfs_group_operations o2nm_node_group_group_ops = {
 655         .make_item      = o2nm_node_group_make_item,
 656         .drop_item      = o2nm_node_group_drop_item,
 657 };
 658
 659 static const struct config_item_type o2nm_node_group_type = {
 660         .ct_group_ops   = &o2nm_node_group_group_ops,
 661         .ct_owner       = THIS_MODULE,
 662 };
 663
 664 /* cluster */
 665
 666 static void o2nm_cluster_release(struct config_item *item)
 667 {
 668         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 669
 670         kfree(cluster);
 671 }
 672
 673 static struct configfs_item_operations o2nm_cluster_item_ops = {
 674         .release        = o2nm_cluster_release,
 675 };
 676
 677 static const struct config_item_type o2nm_cluster_type = {
 678         .ct_item_ops    = &o2nm_cluster_item_ops,
 679         .ct_attrs       = o2nm_cluster_attrs,
 680         .ct_owner       = THIS_MODULE,
 681 };
 682
 683 /* cluster set */
 684
 685 struct o2nm_cluster_group {
 686         struct configfs_subsystem cs_subsys;
 687         /* some stuff? */
 688 };
 689
 690 #if 0
 691 static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *group)
 692 {
 693         return group ?
 694                 container_of(to_configfs_subsystem(group), struct o2nm_cluster_group, cs_subsys)
 695                : NULL;
 696 }
 697 #endif
 698
 699 static struct config_group *o2nm_cluster_group_make_group(struct config_group *group,
 700                                                           const char *name)
 701 {
 702         struct o2nm_cluster *cluster = NULL;
 703         struct o2nm_node_group *ns = NULL;
 704         struct config_group *o2hb_group = NULL, *ret = NULL;
 705
 706         /* this runs under the parent dir's i_mutex; there can be only
 707          * one caller in here at a time */
 708         if (o2nm_single_cluster)
 709                 return ERR_PTR(-ENOSPC);
 710
 711         cluster = kzalloc(sizeof(struct o2nm_cluster), GFP_KERNEL);
 712         ns = kzalloc(sizeof(struct o2nm_node_group), GFP_KERNEL);
 713         o2hb_group = o2hb_alloc_hb_set();
 714         if (cluster == NULL || ns == NULL || o2hb_group == NULL)
 715                 goto out;
 716
 717         config_group_init_type_name(&cluster->cl_group, name,
 718                                     &o2nm_cluster_type);
 719         configfs_add_default_group(&ns->ns_group, &cluster->cl_group);
 720
 721         config_group_init_type_name(&ns->ns_group, "node",
 722                                     &o2nm_node_group_type);
 723         configfs_add_default_group(o2hb_group, &cluster->cl_group);
 724
 725         rwlock_init(&cluster->cl_nodes_lock);
 726         cluster->cl_node_ip_tree = RB_ROOT;
 727         cluster->cl_reconnect_delay_ms = O2NET_RECONNECT_DELAY_MS_DEFAULT;
 728         cluster->cl_idle_timeout_ms    = O2NET_IDLE_TIMEOUT_MS_DEFAULT;
 729         cluster->cl_keepalive_delay_ms = O2NET_KEEPALIVE_DELAY_MS_DEFAULT;
 730         cluster->cl_fence_method       = O2NM_FENCE_RESET;
 731
 732         ret = &cluster->cl_group;
 733         o2nm_single_cluster = cluster;
 734
 735 out:
 736         if (ret == NULL) {
 737                 kfree(cluster);
 738                 kfree(ns);
 739                 o2hb_free_hb_set(o2hb_group);
 740                 ret = ERR_PTR(-ENOMEM);
 741         }
 742
 743         return ret;
 744 }
 745
 746 static void o2nm_cluster_group_drop_item(struct config_group *group, struct config_item *item)
 747 {
 748         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 749
 750         BUG_ON(o2nm_single_cluster != cluster);
 751         o2nm_single_cluster = NULL;
 752
 753         configfs_remove_default_groups(&cluster->cl_group);
 754         config_item_put(item);
 755 }
 756
 757 static struct configfs_group_operations o2nm_cluster_group_group_ops = {
 758         .make_group     = o2nm_cluster_group_make_group,
 759         .drop_item      = o2nm_cluster_group_drop_item,
 760 };
 761
 762 static const struct config_item_type o2nm_cluster_group_type = {
 763         .ct_group_ops   = &o2nm_cluster_group_group_ops,
 764         .ct_owner       = THIS_MODULE,
 765 };
 766
 767 static struct o2nm_cluster_group o2nm_cluster_group = {
 768         .cs_subsys = {
 769                 .su_group = {
 770                         .cg_item = {
 771                                 .ci_namebuf = "cluster",
 772                                 .ci_type = &o2nm_cluster_group_type,
 773                         },
 774                 },
 775         },
 776 };
 777
 778 static inline void o2nm_lock_subsystem(void)
 779 {
 780         mutex_lock(&o2nm_cluster_group.cs_subsys.su_mutex);
 781 }
 782
 783 static inline void o2nm_unlock_subsystem(void)
 784 {
 785         mutex_unlock(&o2nm_cluster_group.cs_subsys.su_mutex);
 786 }
 787
 788 int o2nm_depend_item(struct config_item *item)
 789 {
 790         return configfs_depend_item(&o2nm_cluster_group.cs_subsys, item);
 791 }
 792
 793 void o2nm_undepend_item(struct config_item *item)
 794 {
 795         configfs_undepend_item(item);
 796 }
 797
 798 int o2nm_depend_this_node(void)
 799 {
 800         int ret = 0;
 801         struct o2nm_node *local_node;
 802
 803         local_node = o2nm_get_node_by_num(o2nm_this_node());
 804         if (!local_node) {
 805                 ret = -EINVAL;
 806                 goto out;
 807         }
 808
 809         ret = o2nm_depend_item(&local_node->nd_item);
 810         o2nm_node_put(local_node);
 811
 812 out:
 813         return ret;
 814 }
 815
 816 void o2nm_undepend_this_node(void)
 817 {
 818         struct o2nm_node *local_node;
 819
 820         local_node = o2nm_get_node_by_num(o2nm_this_node());
 821         BUG_ON(!local_node);
 822
 823         o2nm_undepend_item(&local_node->nd_item);
 824         o2nm_node_put(local_node);
 825 }
 826
 827
 828 static void __exit exit_o2nm(void)
 829 {
 830         /* XXX sync with hb callbacks and shut down hb? */
 831         o2net_unregister_hb_callbacks();
 832         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 833         o2cb_sys_shutdown();
 834
 835         o2net_exit();
 836         o2hb_exit();
 837 }
 838
 839 static int __init init_o2nm(void)
 840 {
 841         int ret = -1;
 842
 843         ret = o2hb_init();
 844         if (ret)
 845                 goto out;
 846
 847         ret = o2net_init();
 848         if (ret)
 849                 goto out_o2hb;
 850
 851         ret = o2net_register_hb_callbacks();
 852         if (ret)
 853                 goto out_o2net;
 854
 855         config_group_init(&o2nm_cluster_group.cs_subsys.su_group);
 856         mutex_init(&o2nm_cluster_group.cs_subsys.su_mutex);
 857         ret = configfs_register_subsystem(&o2nm_cluster_group.cs_subsys);
 858         if (ret) {
 859                 printk(KERN_ERR "nodemanager: Registration returned %d\n", ret);
 860                 goto out_callbacks;
 861         }
 862
 863         ret = o2cb_sys_init();
 864         if (!ret)
 865                 goto out;
 866
 867         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 868 out_callbacks:
 869         o2net_unregister_hb_callbacks();
 870 out_o2net:
 871         o2net_exit();
 872 out_o2hb:
 873         o2hb_exit();
 874 out:
 875         return ret;
 876 }
 877
 878 MODULE_AUTHOR("Oracle");
 879 MODULE_LICENSE("GPL");
 880 MODULE_DESCRIPTION("OCFS2 cluster management");
 881
 882 module_init(init_o2nm)
 883 module_exit(exit_o2nm)