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/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/sysctl.h>
  25 #include <linux/configfs.h>
  26
  27 #include "endian.h"
  28 #include "tcp.h"
  29 #include "nodemanager.h"
  30 #include "heartbeat.h"
  31 #include "masklog.h"
  32 #include "sys.h"
  33 #include "ver.h"
  34
  35 /* for now we operate under the assertion that there can be only one
  36  * cluster active at a time.  Changing this will require trickling
  37  * cluster references throughout where nodes are looked up */
  38 static struct o2nm_cluster *o2nm_single_cluster = NULL;
  39
  40 #define OCFS2_MAX_HB_CTL_PATH 256
  41 static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
  42
  43 static ctl_table ocfs2_nm_table[] = {
  44         {
  45                 .ctl_name       = 1,
  46                 .procname       = "hb_ctl_path",
  47                 .data           = ocfs2_hb_ctl_path,
  48                 .maxlen         = OCFS2_MAX_HB_CTL_PATH,
  49                 .mode           = 0644,
  50                 .proc_handler   = &proc_dostring,
  51                 .strategy       = &sysctl_string,
  52         },
  53         { .ctl_name = 0 }
  54 };
  55
  56 static ctl_table ocfs2_mod_table[] = {
  57         {
  58                 .ctl_name       = KERN_OCFS2_NM,
  59                 .procname       = "nm",
  60                 .data           = NULL,
  61                 .maxlen         = 0,
  62                 .mode           = 0555,
  63                 .child          = ocfs2_nm_table
  64         },
  65         { .ctl_name = 0}
  66 };
  67
  68 static ctl_table ocfs2_kern_table[] = {
  69         {
  70                 .ctl_name       = KERN_OCFS2,
  71                 .procname       = "ocfs2",
  72                 .data           = NULL,
  73                 .maxlen         = 0,
  74                 .mode           = 0555,
  75                 .child          = ocfs2_mod_table
  76         },
  77         { .ctl_name = 0}
  78 };
  79
  80 static ctl_table ocfs2_root_table[] = {
  81         {
  82                 .ctl_name       = CTL_FS,
  83                 .procname       = "fs",
  84                 .data           = NULL,
  85                 .maxlen         = 0,
  86                 .mode           = 0555,
  87                 .child          = ocfs2_kern_table
  88         },
  89         { .ctl_name = 0 }
  90 };
  91
  92 static struct ctl_table_header *ocfs2_table_header = NULL;
  93
  94 const char *o2nm_get_hb_ctl_path(void)
  95 {
  96         return ocfs2_hb_ctl_path;
  97 }
  98 EXPORT_SYMBOL_GPL(o2nm_get_hb_ctl_path);
  99
 100 struct o2nm_cluster {
 101         struct config_group     cl_group;
 102         unsigned                cl_has_local:1;
 103         u8                      cl_local_node;
 104         rwlock_t                cl_nodes_lock;
 105         struct o2nm_node        *cl_nodes[O2NM_MAX_NODES];
 106         struct rb_root          cl_node_ip_tree;
 107         /* this bitmap is part of a hack for disk bitmap.. will go eventually. - zab */
 108         unsigned long   cl_nodes_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
 109 };
 110
 111 struct o2nm_node *o2nm_get_node_by_num(u8 node_num)
 112 {
 113         struct o2nm_node *node = NULL;
 114
 115         if (node_num >= O2NM_MAX_NODES || o2nm_single_cluster == NULL)
 116                 goto out;
 117
 118         read_lock(&o2nm_single_cluster->cl_nodes_lock);
 119         node = o2nm_single_cluster->cl_nodes[node_num];
 120         if (node)
 121                 config_item_get(&node->nd_item);
 122         read_unlock(&o2nm_single_cluster->cl_nodes_lock);
 123 out:
 124         return node;
 125 }
 126 EXPORT_SYMBOL_GPL(o2nm_get_node_by_num);
 127
 128 int o2nm_configured_node_map(unsigned long *map, unsigned bytes)
 129 {
 130         struct o2nm_cluster *cluster = o2nm_single_cluster;
 131
 132         BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap)));
 133
 134         if (cluster == NULL)
 135                 return -EINVAL;
 136
 137         read_lock(&cluster->cl_nodes_lock);
 138         memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap));
 139         read_unlock(&cluster->cl_nodes_lock);
 140
 141         return 0;
 142 }
 143 EXPORT_SYMBOL_GPL(o2nm_configured_node_map);
 144
 145 static struct o2nm_node *o2nm_node_ip_tree_lookup(struct o2nm_cluster *cluster,
 146                                                   __be32 ip_needle,
 147                                                   struct rb_node ***ret_p,
 148                                                   struct rb_node **ret_parent)
 149 {
 150         struct rb_node **p = &cluster->cl_node_ip_tree.rb_node;
 151         struct rb_node *parent = NULL;
 152         struct o2nm_node *node, *ret = NULL;
 153
 154         while (*p) {
 155                 parent = *p;
 156                 node = rb_entry(parent, struct o2nm_node, nd_ip_node);
 157
 158                 if (memcmp(&ip_needle, &node->nd_ipv4_address,
 159                            sizeof(ip_needle)) < 0)
 160                         p = &(*p)->rb_left;
 161                 else if (memcmp(&ip_needle, &node->nd_ipv4_address,
 162                                 sizeof(ip_needle)) > 0)
 163                         p = &(*p)->rb_right;
 164                 else {
 165                         ret = node;
 166                         break;
 167                 }
 168         }
 169
 170         if (ret_p != NULL)
 171                 *ret_p = p;
 172         if (ret_parent != NULL)
 173                 *ret_parent = parent;
 174
 175         return ret;
 176 }
 177
 178 struct o2nm_node *o2nm_get_node_by_ip(__be32 addr)
 179 {
 180         struct o2nm_node *node = NULL;
 181         struct o2nm_cluster *cluster = o2nm_single_cluster;
 182
 183         if (cluster == NULL)
 184                 goto out;
 185
 186         read_lock(&cluster->cl_nodes_lock);
 187         node = o2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL);
 188         if (node)
 189                 config_item_get(&node->nd_item);
 190         read_unlock(&cluster->cl_nodes_lock);
 191
 192 out:
 193         return node;
 194 }
 195 EXPORT_SYMBOL_GPL(o2nm_get_node_by_ip);
 196
 197 void o2nm_node_put(struct o2nm_node *node)
 198 {
 199         config_item_put(&node->nd_item);
 200 }
 201 EXPORT_SYMBOL_GPL(o2nm_node_put);
 202
 203 void o2nm_node_get(struct o2nm_node *node)
 204 {
 205         config_item_get(&node->nd_item);
 206 }
 207 EXPORT_SYMBOL_GPL(o2nm_node_get);
 208
 209 u8 o2nm_this_node(void)
 210 {
 211         u8 node_num = O2NM_MAX_NODES;
 212
 213         if (o2nm_single_cluster && o2nm_single_cluster->cl_has_local)
 214                 node_num = o2nm_single_cluster->cl_local_node;
 215
 216         return node_num;
 217 }
 218 EXPORT_SYMBOL_GPL(o2nm_this_node);
 219
 220 /* node configfs bits */
 221
 222 static struct o2nm_cluster *to_o2nm_cluster(struct config_item *item)
 223 {
 224         return item ?
 225                 container_of(to_config_group(item), struct o2nm_cluster,
 226                              cl_group)
 227                 : NULL;
 228 }
 229
 230 static struct o2nm_node *to_o2nm_node(struct config_item *item)
 231 {
 232         return item ? container_of(item, struct o2nm_node, nd_item) : NULL;
 233 }
 234
 235 static void o2nm_node_release(struct config_item *item)
 236 {
 237         struct o2nm_node *node = to_o2nm_node(item);
 238         kfree(node);
 239 }
 240
 241 static ssize_t o2nm_node_num_read(struct o2nm_node *node, char *page)
 242 {
 243         return sprintf(page, "%d\n", node->nd_num);
 244 }
 245
 246 static struct o2nm_cluster *to_o2nm_cluster_from_node(struct o2nm_node *node)
 247 {
 248         /* through the first node_set .parent
 249          * mycluster/nodes/mynode == o2nm_cluster->o2nm_node_group->o2nm_node */
 250         return to_o2nm_cluster(node->nd_item.ci_parent->ci_parent);
 251 }
 252
 253 enum {
 254         O2NM_NODE_ATTR_NUM = 0,
 255         O2NM_NODE_ATTR_PORT,
 256         O2NM_NODE_ATTR_ADDRESS,
 257         O2NM_NODE_ATTR_LOCAL,
 258 };
 259
 260 static ssize_t o2nm_node_num_write(struct o2nm_node *node, const char *page,
 261                                    size_t count)
 262 {
 263         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
 264         unsigned long tmp;
 265         char *p = (char *)page;
 266
 267         tmp = simple_strtoul(p, &p, 0);
 268         if (!p || (*p && (*p != '\n')))
 269                 return -EINVAL;
 270
 271         if (tmp >= O2NM_MAX_NODES)
 272                 return -ERANGE;
 273
 274         /* once we're in the cl_nodes tree networking can look us up by
 275          * node number and try to use our address and port attributes
 276          * to connect to this node.. make sure that they've been set
 277          * before writing the node attribute? */
 278         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 279             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 280                 return -EINVAL; /* XXX */
 281
 282         write_lock(&cluster->cl_nodes_lock);
 283         if (cluster->cl_nodes[tmp])
 284                 p = NULL;
 285         else  {
 286                 cluster->cl_nodes[tmp] = node;
 287                 node->nd_num = tmp;
 288                 set_bit(tmp, cluster->cl_nodes_bitmap);
 289         }
 290         write_unlock(&cluster->cl_nodes_lock);
 291         if (p == NULL)
 292                 return -EEXIST;
 293
 294         return count;
 295 }
 296 static ssize_t o2nm_node_ipv4_port_read(struct o2nm_node *node, char *page)
 297 {
 298         return sprintf(page, "%u\n", ntohs(node->nd_ipv4_port));
 299 }
 300
 301 static ssize_t o2nm_node_ipv4_port_write(struct o2nm_node *node,
 302                                          const char *page, size_t count)
 303 {
 304         unsigned long tmp;
 305         char *p = (char *)page;
 306
 307         tmp = simple_strtoul(p, &p, 0);
 308         if (!p || (*p && (*p != '\n')))
 309                 return -EINVAL;
 310
 311         if (tmp == 0)
 312                 return -EINVAL;
 313         if (tmp >= (u16)-1)
 314                 return -ERANGE;
 315
 316         node->nd_ipv4_port = htons(tmp);
 317
 318         return count;
 319 }
 320
 321 static ssize_t o2nm_node_ipv4_address_read(struct o2nm_node *node, char *page)
 322 {
 323         return sprintf(page, "%u.%u.%u.%u\n", NIPQUAD(node->nd_ipv4_address));
 324 }
 325
 326 static ssize_t o2nm_node_ipv4_address_write(struct o2nm_node *node,
 327                                             const char *page,
 328                                             size_t count)
 329 {
 330         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
 331         int ret, i;
 332         struct rb_node **p, *parent;
 333         unsigned int octets[4];
 334         __be32 ipv4_addr = 0;
 335
 336         ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2],
 337                      &octets[1], &octets[0]);
 338         if (ret != 4)
 339                 return -EINVAL;
 340
 341         for (i = 0; i < ARRAY_SIZE(octets); i++) {
 342                 if (octets[i] > 255)
 343                         return -ERANGE;
 344                 be32_add_cpu(&ipv4_addr, octets[i] << (i * 8));
 345         }
 346
 347         ret = 0;
 348         write_lock(&cluster->cl_nodes_lock);
 349         if (o2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent))
 350                 ret = -EEXIST;
 351         else {
 352                 rb_link_node(&node->nd_ip_node, parent, p);
 353                 rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 354         }
 355         write_unlock(&cluster->cl_nodes_lock);
 356         if (ret)
 357                 return ret;
 358
 359         memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr));
 360
 361         return count;
 362 }
 363
 364 static ssize_t o2nm_node_local_read(struct o2nm_node *node, char *page)
 365 {
 366         return sprintf(page, "%d\n", node->nd_local);
 367 }
 368
 369 static ssize_t o2nm_node_local_write(struct o2nm_node *node, const char *page,
 370                                      size_t count)
 371 {
 372         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
 373         unsigned long tmp;
 374         char *p = (char *)page;
 375         ssize_t ret;
 376
 377         tmp = simple_strtoul(p, &p, 0);
 378         if (!p || (*p && (*p != '\n')))
 379                 return -EINVAL;
 380
 381         tmp = !!tmp; /* boolean of whether this node wants to be local */
 382
 383         /* setting local turns on networking rx for now so we require having
 384          * set everything else first */
 385         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 386             !test_bit(O2NM_NODE_ATTR_NUM, &node->nd_set_attributes) ||
 387             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 388                 return -EINVAL; /* XXX */
 389
 390         /* the only failure case is trying to set a new local node
 391          * when a different one is already set */
 392         if (tmp && tmp == cluster->cl_has_local &&
 393             cluster->cl_local_node != node->nd_num)
 394                 return -EBUSY;
 395
 396         /* bring up the rx thread if we're setting the new local node. */
 397         if (tmp && !cluster->cl_has_local) {
 398                 ret = o2net_start_listening(node);
 399                 if (ret)
 400                         return ret;
 401         }
 402
 403         if (!tmp && cluster->cl_has_local &&
 404             cluster->cl_local_node == node->nd_num) {
 405                 o2net_stop_listening(node);
 406                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 407         }
 408
 409         node->nd_local = tmp;
 410         if (node->nd_local) {
 411                 cluster->cl_has_local = tmp;
 412                 cluster->cl_local_node = node->nd_num;
 413         }
 414
 415         return count;
 416 }
 417
 418 struct o2nm_node_attribute {
 419         struct configfs_attribute attr;
 420         ssize_t (*show)(struct o2nm_node *, char *);
 421         ssize_t (*store)(struct o2nm_node *, const char *, size_t);
 422 };
 423
 424 static struct o2nm_node_attribute o2nm_node_attr_num = {
 425         .attr   = { .ca_owner = THIS_MODULE,
 426                     .ca_name = "num",
 427                     .ca_mode = S_IRUGO | S_IWUSR },
 428         .show   = o2nm_node_num_read,
 429         .store  = o2nm_node_num_write,
 430 };
 431
 432 static struct o2nm_node_attribute o2nm_node_attr_ipv4_port = {
 433         .attr   = { .ca_owner = THIS_MODULE,
 434                     .ca_name = "ipv4_port",
 435                     .ca_mode = S_IRUGO | S_IWUSR },
 436         .show   = o2nm_node_ipv4_port_read,
 437         .store  = o2nm_node_ipv4_port_write,
 438 };
 439
 440 static struct o2nm_node_attribute o2nm_node_attr_ipv4_address = {
 441         .attr   = { .ca_owner = THIS_MODULE,
 442                     .ca_name = "ipv4_address",
 443                     .ca_mode = S_IRUGO | S_IWUSR },
 444         .show   = o2nm_node_ipv4_address_read,
 445         .store  = o2nm_node_ipv4_address_write,
 446 };
 447
 448 static struct o2nm_node_attribute o2nm_node_attr_local = {
 449         .attr   = { .ca_owner = THIS_MODULE,
 450                     .ca_name = "local",
 451                     .ca_mode = S_IRUGO | S_IWUSR },
 452         .show   = o2nm_node_local_read,
 453         .store  = o2nm_node_local_write,
 454 };
 455
 456 static struct configfs_attribute *o2nm_node_attrs[] = {
 457         [O2NM_NODE_ATTR_NUM] = &o2nm_node_attr_num.attr,
 458         [O2NM_NODE_ATTR_PORT] = &o2nm_node_attr_ipv4_port.attr,
 459         [O2NM_NODE_ATTR_ADDRESS] = &o2nm_node_attr_ipv4_address.attr,
 460         [O2NM_NODE_ATTR_LOCAL] = &o2nm_node_attr_local.attr,
 461         NULL,
 462 };
 463
 464 static int o2nm_attr_index(struct configfs_attribute *attr)
 465 {
 466         int i;
 467         for (i = 0; i < ARRAY_SIZE(o2nm_node_attrs); i++) {
 468                 if (attr == o2nm_node_attrs[i])
 469                         return i;
 470         }
 471         BUG();
 472         return 0;
 473 }
 474
 475 static ssize_t o2nm_node_show(struct config_item *item,
 476                               struct configfs_attribute *attr,
 477                               char *page)
 478 {
 479         struct o2nm_node *node = to_o2nm_node(item);
 480         struct o2nm_node_attribute *o2nm_node_attr =
 481                 container_of(attr, struct o2nm_node_attribute, attr);
 482         ssize_t ret = 0;
 483
 484         if (o2nm_node_attr->show)
 485                 ret = o2nm_node_attr->show(node, page);
 486         return ret;
 487 }
 488
 489 static ssize_t o2nm_node_store(struct config_item *item,
 490                                struct configfs_attribute *attr,
 491                                const char *page, size_t count)
 492 {
 493         struct o2nm_node *node = to_o2nm_node(item);
 494         struct o2nm_node_attribute *o2nm_node_attr =
 495                 container_of(attr, struct o2nm_node_attribute, attr);
 496         ssize_t ret;
 497         int attr_index = o2nm_attr_index(attr);
 498
 499         if (o2nm_node_attr->store == NULL) {
 500                 ret = -EINVAL;
 501                 goto out;
 502         }
 503
 504         if (test_bit(attr_index, &node->nd_set_attributes))
 505                 return -EBUSY;
 506
 507         ret = o2nm_node_attr->store(node, page, count);
 508         if (ret < count)
 509                 goto out;
 510
 511         set_bit(attr_index, &node->nd_set_attributes);
 512 out:
 513         return ret;
 514 }
 515
 516 static struct configfs_item_operations o2nm_node_item_ops = {
 517         .release                = o2nm_node_release,
 518         .show_attribute         = o2nm_node_show,
 519         .store_attribute        = o2nm_node_store,
 520 };
 521
 522 static struct config_item_type o2nm_node_type = {
 523         .ct_item_ops    = &o2nm_node_item_ops,
 524         .ct_attrs       = o2nm_node_attrs,
 525         .ct_owner       = THIS_MODULE,
 526 };
 527
 528 /* node set */
 529
 530 struct o2nm_node_group {
 531         struct config_group ns_group;
 532         /* some stuff? */
 533 };
 534
 535 #if 0
 536 static struct o2nm_node_group *to_o2nm_node_group(struct config_group *group)
 537 {
 538         return group ?
 539                 container_of(group, struct o2nm_node_group, ns_group)
 540                 : NULL;
 541 }
 542 #endif
 543
 544 static struct config_item *o2nm_node_group_make_item(struct config_group *group,
 545                                                      const char *name)
 546 {
 547         struct o2nm_node *node = NULL;
 548         struct config_item *ret = NULL;
 549
 550         if (strlen(name) > O2NM_MAX_NAME_LEN)
 551                 goto out; /* ENAMETOOLONG */
 552
 553         node = kcalloc(1, sizeof(struct o2nm_node), GFP_KERNEL);
 554         if (node == NULL)
 555                 goto out; /* ENOMEM */
 556
 557         strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
 558         config_item_init_type_name(&node->nd_item, name, &o2nm_node_type);
 559         spin_lock_init(&node->nd_lock);
 560
 561         ret = &node->nd_item;
 562
 563 out:
 564         if (ret == NULL)
 565                 kfree(node);
 566
 567         return ret;
 568 }
 569
 570 static void o2nm_node_group_drop_item(struct config_group *group,
 571                                       struct config_item *item)
 572 {
 573         struct o2nm_node *node = to_o2nm_node(item);
 574         struct o2nm_cluster *cluster = to_o2nm_cluster(group->cg_item.ci_parent);
 575
 576         o2net_disconnect_node(node);
 577
 578         if (cluster->cl_has_local &&
 579             (cluster->cl_local_node == node->nd_num)) {
 580                 cluster->cl_has_local = 0;
 581                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 582                 o2net_stop_listening(node);
 583         }
 584
 585         /* XXX call into net to stop this node from trading messages */
 586
 587         write_lock(&cluster->cl_nodes_lock);
 588
 589         /* XXX sloppy */
 590         if (node->nd_ipv4_address)
 591                 rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 592
 593         /* nd_num might be 0 if the node number hasn't been set.. */
 594         if (cluster->cl_nodes[node->nd_num] == node) {
 595                 cluster->cl_nodes[node->nd_num] = NULL;
 596                 clear_bit(node->nd_num, cluster->cl_nodes_bitmap);
 597         }
 598         write_unlock(&cluster->cl_nodes_lock);
 599
 600         config_item_put(item);
 601 }
 602
 603 static struct configfs_group_operations o2nm_node_group_group_ops = {
 604         .make_item      = o2nm_node_group_make_item,
 605         .drop_item      = o2nm_node_group_drop_item,
 606 };
 607
 608 static struct config_item_type o2nm_node_group_type = {
 609         .ct_group_ops   = &o2nm_node_group_group_ops,
 610         .ct_owner       = THIS_MODULE,
 611 };
 612
 613 /* cluster */
 614
 615 static void o2nm_cluster_release(struct config_item *item)
 616 {
 617         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 618
 619         kfree(cluster->cl_group.default_groups);
 620         kfree(cluster);
 621 }
 622
 623 static struct configfs_item_operations o2nm_cluster_item_ops = {
 624         .release        = o2nm_cluster_release,
 625 };
 626
 627 static struct config_item_type o2nm_cluster_type = {
 628         .ct_item_ops    = &o2nm_cluster_item_ops,
 629         .ct_owner       = THIS_MODULE,
 630 };
 631
 632 /* cluster set */
 633
 634 struct o2nm_cluster_group {
 635         struct configfs_subsystem cs_subsys;
 636         /* some stuff? */
 637 };
 638
 639 #if 0
 640 static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *group)
 641 {
 642         return group ?
 643                 container_of(to_configfs_subsystem(group), struct o2nm_cluster_group, cs_subsys)
 644                : NULL;
 645 }
 646 #endif
 647
 648 static struct config_group *o2nm_cluster_group_make_group(struct config_group *group,
 649                                                           const char *name)
 650 {
 651         struct o2nm_cluster *cluster = NULL;
 652         struct o2nm_node_group *ns = NULL;
 653         struct config_group *o2hb_group = NULL, *ret = NULL;
 654         void *defs = NULL;
 655
 656         /* this runs under the parent dir's i_mutex; there can be only
 657          * one caller in here at a time */
 658         if (o2nm_single_cluster)
 659                 goto out; /* ENOSPC */
 660
 661         cluster = kcalloc(1, sizeof(struct o2nm_cluster), GFP_KERNEL);
 662         ns = kcalloc(1, sizeof(struct o2nm_node_group), GFP_KERNEL);
 663         defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
 664         o2hb_group = o2hb_alloc_hb_set();
 665         if (cluster == NULL || ns == NULL || o2hb_group == NULL || defs == NULL)
 666                 goto out;
 667
 668         config_group_init_type_name(&cluster->cl_group, name,
 669                                     &o2nm_cluster_type);
 670         config_group_init_type_name(&ns->ns_group, "node",
 671                                     &o2nm_node_group_type);
 672
 673         cluster->cl_group.default_groups = defs;
 674         cluster->cl_group.default_groups[0] = &ns->ns_group;
 675         cluster->cl_group.default_groups[1] = o2hb_group;
 676         cluster->cl_group.default_groups[2] = NULL;
 677         rwlock_init(&cluster->cl_nodes_lock);
 678         cluster->cl_node_ip_tree = RB_ROOT;
 679
 680         ret = &cluster->cl_group;
 681         o2nm_single_cluster = cluster;
 682
 683 out:
 684         if (ret == NULL) {
 685                 kfree(cluster);
 686                 kfree(ns);
 687                 o2hb_free_hb_set(o2hb_group);
 688                 kfree(defs);
 689         }
 690
 691         return ret;
 692 }
 693
 694 static void o2nm_cluster_group_drop_item(struct config_group *group, struct config_item *item)
 695 {
 696         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 697         int i;
 698         struct config_item *killme;
 699
 700         BUG_ON(o2nm_single_cluster != cluster);
 701         o2nm_single_cluster = NULL;
 702
 703         for (i = 0; cluster->cl_group.default_groups[i]; i++) {
 704                 killme = &cluster->cl_group.default_groups[i]->cg_item;
 705                 cluster->cl_group.default_groups[i] = NULL;
 706                 config_item_put(killme);
 707         }
 708
 709         config_item_put(item);
 710 }
 711
 712 static struct configfs_group_operations o2nm_cluster_group_group_ops = {
 713         .make_group     = o2nm_cluster_group_make_group,
 714         .drop_item      = o2nm_cluster_group_drop_item,
 715 };
 716
 717 static struct config_item_type o2nm_cluster_group_type = {
 718         .ct_group_ops   = &o2nm_cluster_group_group_ops,
 719         .ct_owner       = THIS_MODULE,
 720 };
 721
 722 static struct o2nm_cluster_group o2nm_cluster_group = {
 723         .cs_subsys = {
 724                 .su_group = {
 725                         .cg_item = {
 726                                 .ci_namebuf = "cluster",
 727                                 .ci_type = &o2nm_cluster_group_type,
 728                         },
 729                 },
 730         },
 731 };
 732
 733 static void __exit exit_o2nm(void)
 734 {
 735         if (ocfs2_table_header)
 736                 unregister_sysctl_table(ocfs2_table_header);
 737
 738         /* XXX sync with hb callbacks and shut down hb? */
 739         o2net_unregister_hb_callbacks();
 740         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 741         o2cb_sys_shutdown();
 742
 743         o2net_exit();
 744 }
 745
 746 static int __init init_o2nm(void)
 747 {
 748         int ret = -1;
 749
 750         cluster_print_version();
 751
 752         o2hb_init();
 753         o2net_init();
 754
 755         ocfs2_table_header = register_sysctl_table(ocfs2_root_table, 0);
 756         if (!ocfs2_table_header) {
 757                 printk(KERN_ERR "nodemanager: unable to register sysctl\n");
 758                 ret = -ENOMEM; /* or something. */
 759                 goto out;
 760         }
 761
 762         ret = o2net_register_hb_callbacks();
 763         if (ret)
 764                 goto out_sysctl;
 765
 766         config_group_init(&o2nm_cluster_group.cs_subsys.su_group);
 767         init_MUTEX(&o2nm_cluster_group.cs_subsys.su_sem);
 768         ret = configfs_register_subsystem(&o2nm_cluster_group.cs_subsys);
 769         if (ret) {
 770                 printk(KERN_ERR "nodemanager: Registration returned %d\n", ret);
 771                 goto out_callbacks;
 772         }
 773
 774         ret = o2cb_sys_init();
 775         if (!ret)
 776                 goto out;
 777
 778         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 779 out_callbacks:
 780         o2net_unregister_hb_callbacks();
 781 out_sysctl:
 782         unregister_sysctl_table(ocfs2_table_header);
 783 out:
 784         return ret;
 785 }
 786
 787 MODULE_AUTHOR("Oracle");
 788 MODULE_LICENSE("GPL");
 789
 790 module_init(init_o2nm)
 791 module_exit(exit_o2nm)