git.oblomov.eu Git - linux-2.6/blob - 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/configfs.h>
  25
  26 #include "tcp.h"
  27 #include "nodemanager.h"
  28 #include "heartbeat.h"
  29 #include "masklog.h"
  30 #include "sys.h"
  31 #include "ver.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
  39 struct o2nm_node *o2nm_get_node_by_num(u8 node_num)
  40 {
  41         struct o2nm_node *node = NULL;
  42
  43         if (node_num >= O2NM_MAX_NODES || o2nm_single_cluster == NULL)
  44                 goto out;
  45
  46         read_lock(&o2nm_single_cluster->cl_nodes_lock);
  47         node = o2nm_single_cluster->cl_nodes[node_num];
  48         if (node)
  49                 config_item_get(&node->nd_item);
  50         read_unlock(&o2nm_single_cluster->cl_nodes_lock);
  51 out:
  52         return node;
  53 }
  54 EXPORT_SYMBOL_GPL(o2nm_get_node_by_num);
  55
  56 int o2nm_configured_node_map(unsigned long *map, unsigned bytes)
  57 {
  58         struct o2nm_cluster *cluster = o2nm_single_cluster;
  59
  60         BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap)));
  61
  62         if (cluster == NULL)
  63                 return -EINVAL;
  64
  65         read_lock(&cluster->cl_nodes_lock);
  66         memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap));
  67         read_unlock(&cluster->cl_nodes_lock);
  68
  69         return 0;
  70 }
  71 EXPORT_SYMBOL_GPL(o2nm_configured_node_map);
  72
  73 static struct o2nm_node *o2nm_node_ip_tree_lookup(struct o2nm_cluster *cluster,
  74                                                   __be32 ip_needle,
  75                                                   struct rb_node ***ret_p,
  76                                                   struct rb_node **ret_parent)
  77 {
  78         struct rb_node **p = &cluster->cl_node_ip_tree.rb_node;
  79         struct rb_node *parent = NULL;
  80         struct o2nm_node *node, *ret = NULL;
  81
  82         while (*p) {
  83                 int cmp;
  84
  85                 parent = *p;
  86                 node = rb_entry(parent, struct o2nm_node, nd_ip_node);
  87
  88                 cmp = memcmp(&ip_needle, &node->nd_ipv4_address,
  89                                 sizeof(ip_needle));
  90                 if (cmp < 0)
  91                         p = &(*p)->rb_left;
  92                 else if (cmp > 0)
  93                         p = &(*p)->rb_right;
  94                 else {
  95                         ret = node;
  96                         break;
  97                 }
  98         }
  99
 100         if (ret_p != NULL)
 101                 *ret_p = p;
 102         if (ret_parent != NULL)
 103                 *ret_parent = parent;
 104
 105         return ret;
 106 }
 107
 108 struct o2nm_node *o2nm_get_node_by_ip(__be32 addr)
 109 {
 110         struct o2nm_node *node = NULL;
 111         struct o2nm_cluster *cluster = o2nm_single_cluster;
 112
 113         if (cluster == NULL)
 114                 goto out;
 115
 116         read_lock(&cluster->cl_nodes_lock);
 117         node = o2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL);
 118         if (node)
 119                 config_item_get(&node->nd_item);
 120         read_unlock(&cluster->cl_nodes_lock);
 121
 122 out:
 123         return node;
 124 }
 125 EXPORT_SYMBOL_GPL(o2nm_get_node_by_ip);
 126
 127 void o2nm_node_put(struct o2nm_node *node)
 128 {
 129         config_item_put(&node->nd_item);
 130 }
 131 EXPORT_SYMBOL_GPL(o2nm_node_put);
 132
 133 void o2nm_node_get(struct o2nm_node *node)
 134 {
 135         config_item_get(&node->nd_item);
 136 }
 137 EXPORT_SYMBOL_GPL(o2nm_node_get);
 138
 139 u8 o2nm_this_node(void)
 140 {
 141         u8 node_num = O2NM_MAX_NODES;
 142
 143         if (o2nm_single_cluster && o2nm_single_cluster->cl_has_local)
 144                 node_num = o2nm_single_cluster->cl_local_node;
 145
 146         return node_num;
 147 }
 148 EXPORT_SYMBOL_GPL(o2nm_this_node);
 149
 150 /* node configfs bits */
 151
 152 static struct o2nm_cluster *to_o2nm_cluster(struct config_item *item)
 153 {
 154         return item ?
 155                 container_of(to_config_group(item), struct o2nm_cluster,
 156                              cl_group)
 157                 : NULL;
 158 }
 159
 160 static struct o2nm_node *to_o2nm_node(struct config_item *item)
 161 {
 162         return item ? container_of(item, struct o2nm_node, nd_item) : NULL;
 163 }
 164
 165 static void o2nm_node_release(struct config_item *item)
 166 {
 167         struct o2nm_node *node = to_o2nm_node(item);
 168         kfree(node);
 169 }
 170
 171 static ssize_t o2nm_node_num_read(struct o2nm_node *node, char *page)
 172 {
 173         return sprintf(page, "%d\n", node->nd_num);
 174 }
 175
 176 static struct o2nm_cluster *to_o2nm_cluster_from_node(struct o2nm_node *node)
 177 {
 178         /* through the first node_set .parent
 179          * mycluster/nodes/mynode == o2nm_cluster->o2nm_node_group->o2nm_node */
 180         return to_o2nm_cluster(node->nd_item.ci_parent->ci_parent);
 181 }
 182
 183 enum {
 184         O2NM_NODE_ATTR_NUM = 0,
 185         O2NM_NODE_ATTR_PORT,
 186         O2NM_NODE_ATTR_ADDRESS,
 187         O2NM_NODE_ATTR_LOCAL,
 188 };
 189
 190 static ssize_t o2nm_node_num_write(struct o2nm_node *node, const char *page,
 191                                    size_t count)
 192 {
 193         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
 194         unsigned long tmp;
 195         char *p = (char *)page;
 196
 197         tmp = simple_strtoul(p, &p, 0);
 198         if (!p || (*p && (*p != '\n')))
 199                 return -EINVAL;
 200
 201         if (tmp >= O2NM_MAX_NODES)
 202                 return -ERANGE;
 203
 204         /* once we're in the cl_nodes tree networking can look us up by
 205          * node number and try to use our address and port attributes
 206          * to connect to this node.. make sure that they've been set
 207          * before writing the node attribute? */
 208         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 209             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 210                 return -EINVAL; /* XXX */
 211
 212         write_lock(&cluster->cl_nodes_lock);
 213         if (cluster->cl_nodes[tmp])
 214                 p = NULL;
 215         else  {
 216                 cluster->cl_nodes[tmp] = node;
 217                 node->nd_num = tmp;
 218                 set_bit(tmp, cluster->cl_nodes_bitmap);
 219         }
 220         write_unlock(&cluster->cl_nodes_lock);
 221         if (p == NULL)
 222                 return -EEXIST;
 223
 224         return count;
 225 }
 226 static ssize_t o2nm_node_ipv4_port_read(struct o2nm_node *node, char *page)
 227 {
 228         return sprintf(page, "%u\n", ntohs(node->nd_ipv4_port));
 229 }
 230
 231 static ssize_t o2nm_node_ipv4_port_write(struct o2nm_node *node,
 232                                          const char *page, size_t count)
 233 {
 234         unsigned long tmp;
 235         char *p = (char *)page;
 236
 237         tmp = simple_strtoul(p, &p, 0);
 238         if (!p || (*p && (*p != '\n')))
 239                 return -EINVAL;
 240
 241         if (tmp == 0)
 242                 return -EINVAL;
 243         if (tmp >= (u16)-1)
 244                 return -ERANGE;
 245
 246         node->nd_ipv4_port = htons(tmp);
 247
 248         return count;
 249 }
 250
 251 static ssize_t o2nm_node_ipv4_address_read(struct o2nm_node *node, char *page)
 252 {
 253         return sprintf(page, "%u.%u.%u.%u\n", NIPQUAD(node->nd_ipv4_address));
 254 }
 255
 256 static ssize_t o2nm_node_ipv4_address_write(struct o2nm_node *node,
 257                                             const char *page,
 258                                             size_t count)
 259 {
 260         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
 261         int ret, i;
 262         struct rb_node **p, *parent;
 263         unsigned int octets[4];
 264         __be32 ipv4_addr = 0;
 265
 266         ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2],
 267                      &octets[1], &octets[0]);
 268         if (ret != 4)
 269                 return -EINVAL;
 270
 271         for (i = 0; i < ARRAY_SIZE(octets); i++) {
 272                 if (octets[i] > 255)
 273                         return -ERANGE;
 274                 be32_add_cpu(&ipv4_addr, octets[i] << (i * 8));
 275         }
 276
 277         ret = 0;
 278         write_lock(&cluster->cl_nodes_lock);
 279         if (o2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent))
 280                 ret = -EEXIST;
 281         else {
 282                 rb_link_node(&node->nd_ip_node, parent, p);
 283                 rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 284         }
 285         write_unlock(&cluster->cl_nodes_lock);
 286         if (ret)
 287                 return ret;
 288
 289         memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr));
 290
 291         return count;
 292 }
 293
 294 static ssize_t o2nm_node_local_read(struct o2nm_node *node, char *page)
 295 {
 296         return sprintf(page, "%d\n", node->nd_local);
 297 }
 298
 299 static ssize_t o2nm_node_local_write(struct o2nm_node *node, const char *page,
 300                                      size_t count)
 301 {
 302         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
 303         unsigned long tmp;
 304         char *p = (char *)page;
 305         ssize_t ret;
 306
 307         tmp = simple_strtoul(p, &p, 0);
 308         if (!p || (*p && (*p != '\n')))
 309                 return -EINVAL;
 310
 311         tmp = !!tmp; /* boolean of whether this node wants to be local */
 312
 313         /* setting local turns on networking rx for now so we require having
 314          * set everything else first */
 315         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 316             !test_bit(O2NM_NODE_ATTR_NUM, &node->nd_set_attributes) ||
 317             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 318                 return -EINVAL; /* XXX */
 319
 320         /* the only failure case is trying to set a new local node
 321          * when a different one is already set */
 322         if (tmp && tmp == cluster->cl_has_local &&
 323             cluster->cl_local_node != node->nd_num)
 324                 return -EBUSY;
 325
 326         /* bring up the rx thread if we're setting the new local node. */
 327         if (tmp && !cluster->cl_has_local) {
 328                 ret = o2net_start_listening(node);
 329                 if (ret)
 330                         return ret;
 331         }
 332
 333         if (!tmp && cluster->cl_has_local &&
 334             cluster->cl_local_node == node->nd_num) {
 335                 o2net_stop_listening(node);
 336                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 337         }
 338
 339         node->nd_local = tmp;
 340         if (node->nd_local) {
 341                 cluster->cl_has_local = tmp;
 342                 cluster->cl_local_node = node->nd_num;
 343         }
 344
 345         return count;
 346 }
 347
 348 struct o2nm_node_attribute {
 349         struct configfs_attribute attr;
 350         ssize_t (*show)(struct o2nm_node *, char *);
 351         ssize_t (*store)(struct o2nm_node *, const char *, size_t);
 352 };
 353
 354 static struct o2nm_node_attribute o2nm_node_attr_num = {
 355         .attr   = { .ca_owner = THIS_MODULE,
 356                     .ca_name = "num",
 357                     .ca_mode = S_IRUGO | S_IWUSR },
 358         .show   = o2nm_node_num_read,
 359         .store  = o2nm_node_num_write,
 360 };
 361
 362 static struct o2nm_node_attribute o2nm_node_attr_ipv4_port = {
 363         .attr   = { .ca_owner = THIS_MODULE,
 364                     .ca_name = "ipv4_port",
 365                     .ca_mode = S_IRUGO | S_IWUSR },
 366         .show   = o2nm_node_ipv4_port_read,
 367         .store  = o2nm_node_ipv4_port_write,
 368 };
 369
 370 static struct o2nm_node_attribute o2nm_node_attr_ipv4_address = {
 371         .attr   = { .ca_owner = THIS_MODULE,
 372                     .ca_name = "ipv4_address",
 373                     .ca_mode = S_IRUGO | S_IWUSR },
 374         .show   = o2nm_node_ipv4_address_read,
 375         .store  = o2nm_node_ipv4_address_write,
 376 };
 377
 378 static struct o2nm_node_attribute o2nm_node_attr_local = {
 379         .attr   = { .ca_owner = THIS_MODULE,
 380                     .ca_name = "local",
 381                     .ca_mode = S_IRUGO | S_IWUSR },
 382         .show   = o2nm_node_local_read,
 383         .store  = o2nm_node_local_write,
 384 };
 385
 386 static struct configfs_attribute *o2nm_node_attrs[] = {
 387         [O2NM_NODE_ATTR_NUM] = &o2nm_node_attr_num.attr,
 388         [O2NM_NODE_ATTR_PORT] = &o2nm_node_attr_ipv4_port.attr,
 389         [O2NM_NODE_ATTR_ADDRESS] = &o2nm_node_attr_ipv4_address.attr,
 390         [O2NM_NODE_ATTR_LOCAL] = &o2nm_node_attr_local.attr,
 391         NULL,
 392 };
 393
 394 static int o2nm_attr_index(struct configfs_attribute *attr)
 395 {
 396         int i;
 397         for (i = 0; i < ARRAY_SIZE(o2nm_node_attrs); i++) {
 398                 if (attr == o2nm_node_attrs[i])
 399                         return i;
 400         }
 401         BUG();
 402         return 0;
 403 }
 404
 405 static ssize_t o2nm_node_show(struct config_item *item,
 406                               struct configfs_attribute *attr,
 407                               char *page)
 408 {
 409         struct o2nm_node *node = to_o2nm_node(item);
 410         struct o2nm_node_attribute *o2nm_node_attr =
 411                 container_of(attr, struct o2nm_node_attribute, attr);
 412         ssize_t ret = 0;
 413
 414         if (o2nm_node_attr->show)
 415                 ret = o2nm_node_attr->show(node, page);
 416         return ret;
 417 }
 418
 419 static ssize_t o2nm_node_store(struct config_item *item,
 420                                struct configfs_attribute *attr,
 421                                const char *page, size_t count)
 422 {
 423         struct o2nm_node *node = to_o2nm_node(item);
 424         struct o2nm_node_attribute *o2nm_node_attr =
 425                 container_of(attr, struct o2nm_node_attribute, attr);
 426         ssize_t ret;
 427         int attr_index = o2nm_attr_index(attr);
 428
 429         if (o2nm_node_attr->store == NULL) {
 430                 ret = -EINVAL;
 431                 goto out;
 432         }
 433
 434         if (test_bit(attr_index, &node->nd_set_attributes))
 435                 return -EBUSY;
 436
 437         ret = o2nm_node_attr->store(node, page, count);
 438         if (ret < count)
 439                 goto out;
 440
 441         set_bit(attr_index, &node->nd_set_attributes);
 442 out:
 443         return ret;
 444 }
 445
 446 static struct configfs_item_operations o2nm_node_item_ops = {
 447         .release                = o2nm_node_release,
 448         .show_attribute         = o2nm_node_show,
 449         .store_attribute        = o2nm_node_store,
 450 };
 451
 452 static struct config_item_type o2nm_node_type = {
 453         .ct_item_ops    = &o2nm_node_item_ops,
 454         .ct_attrs       = o2nm_node_attrs,
 455         .ct_owner       = THIS_MODULE,
 456 };
 457
 458 /* node set */
 459
 460 struct o2nm_node_group {
 461         struct config_group ns_group;
 462         /* some stuff? */
 463 };
 464
 465 #if 0
 466 static struct o2nm_node_group *to_o2nm_node_group(struct config_group *group)
 467 {
 468         return group ?
 469                 container_of(group, struct o2nm_node_group, ns_group)
 470                 : NULL;
 471 }
 472 #endif
 473
 474 struct o2nm_cluster_attribute {
 475         struct configfs_attribute attr;
 476         ssize_t (*show)(struct o2nm_cluster *, char *);
 477         ssize_t (*store)(struct o2nm_cluster *, const char *, size_t);
 478 };
 479
 480 static ssize_t o2nm_cluster_attr_write(const char *page, ssize_t count,
 481                                        unsigned int *val)
 482 {
 483         unsigned long tmp;
 484         char *p = (char *)page;
 485
 486         tmp = simple_strtoul(p, &p, 0);
 487         if (!p || (*p && (*p != '\n')))
 488                 return -EINVAL;
 489
 490         if (tmp == 0)
 491                 return -EINVAL;
 492         if (tmp >= (u32)-1)
 493                 return -ERANGE;
 494
 495         *val = tmp;
 496
 497         return count;
 498 }
 499
 500 static ssize_t o2nm_cluster_attr_idle_timeout_ms_read(
 501         struct o2nm_cluster *cluster, char *page)
 502 {
 503         return sprintf(page, "%u\n", cluster->cl_idle_timeout_ms);
 504 }
 505
 506 static ssize_t o2nm_cluster_attr_idle_timeout_ms_write(
 507         struct o2nm_cluster *cluster, const char *page, size_t count)
 508 {
 509         ssize_t ret;
 510         unsigned int val;
 511
 512         ret =  o2nm_cluster_attr_write(page, count, &val);
 513
 514         if (ret > 0) {
 515                 if (cluster->cl_idle_timeout_ms != val
 516                         && o2net_num_connected_peers()) {
 517                         mlog(ML_NOTICE,
 518                              "o2net: cannot change idle timeout after "
 519                              "the first peer has agreed to it."
 520                              "  %d connected peers\n",
 521                              o2net_num_connected_peers());
 522                         ret = -EINVAL;
 523                 } else if (val <= cluster->cl_keepalive_delay_ms) {
 524                         mlog(ML_NOTICE, "o2net: idle timeout must be larger "
 525                              "than keepalive delay\n");
 526                         ret = -EINVAL;
 527                 } else {
 528                         cluster->cl_idle_timeout_ms = val;
 529                 }
 530         }
 531
 532         return ret;
 533 }
 534
 535 static ssize_t o2nm_cluster_attr_keepalive_delay_ms_read(
 536         struct o2nm_cluster *cluster, char *page)
 537 {
 538         return sprintf(page, "%u\n", cluster->cl_keepalive_delay_ms);
 539 }
 540
 541 static ssize_t o2nm_cluster_attr_keepalive_delay_ms_write(
 542         struct o2nm_cluster *cluster, const char *page, size_t count)
 543 {
 544         ssize_t ret;
 545         unsigned int val;
 546
 547         ret =  o2nm_cluster_attr_write(page, count, &val);
 548
 549         if (ret > 0) {
 550                 if (cluster->cl_keepalive_delay_ms != val
 551                     && o2net_num_connected_peers()) {
 552                         mlog(ML_NOTICE,
 553                              "o2net: cannot change keepalive delay after"
 554                              " the first peer has agreed to it."
 555                              "  %d connected peers\n",
 556                              o2net_num_connected_peers());
 557                         ret = -EINVAL;
 558                 } else if (val >= cluster->cl_idle_timeout_ms) {
 559                         mlog(ML_NOTICE, "o2net: keepalive delay must be "
 560                              "smaller than idle timeout\n");
 561                         ret = -EINVAL;
 562                 } else {
 563                         cluster->cl_keepalive_delay_ms = val;
 564                 }
 565         }
 566
 567         return ret;
 568 }
 569
 570 static ssize_t o2nm_cluster_attr_reconnect_delay_ms_read(
 571         struct o2nm_cluster *cluster, char *page)
 572 {
 573         return sprintf(page, "%u\n", cluster->cl_reconnect_delay_ms);
 574 }
 575
 576 static ssize_t o2nm_cluster_attr_reconnect_delay_ms_write(
 577         struct o2nm_cluster *cluster, const char *page, size_t count)
 578 {
 579         return o2nm_cluster_attr_write(page, count,
 580                                        &cluster->cl_reconnect_delay_ms);
 581 }
 582 static struct o2nm_cluster_attribute o2nm_cluster_attr_idle_timeout_ms = {
 583         .attr   = { .ca_owner = THIS_MODULE,
 584                     .ca_name = "idle_timeout_ms",
 585                     .ca_mode = S_IRUGO | S_IWUSR },
 586         .show   = o2nm_cluster_attr_idle_timeout_ms_read,
 587         .store  = o2nm_cluster_attr_idle_timeout_ms_write,
 588 };
 589
 590 static struct o2nm_cluster_attribute o2nm_cluster_attr_keepalive_delay_ms = {
 591         .attr   = { .ca_owner = THIS_MODULE,
 592                     .ca_name = "keepalive_delay_ms",
 593                     .ca_mode = S_IRUGO | S_IWUSR },
 594         .show   = o2nm_cluster_attr_keepalive_delay_ms_read,
 595         .store  = o2nm_cluster_attr_keepalive_delay_ms_write,
 596 };
 597
 598 static struct o2nm_cluster_attribute o2nm_cluster_attr_reconnect_delay_ms = {
 599         .attr   = { .ca_owner = THIS_MODULE,
 600                     .ca_name = "reconnect_delay_ms",
 601                     .ca_mode = S_IRUGO | S_IWUSR },
 602         .show   = o2nm_cluster_attr_reconnect_delay_ms_read,
 603         .store  = o2nm_cluster_attr_reconnect_delay_ms_write,
 604 };
 605
 606 static struct configfs_attribute *o2nm_cluster_attrs[] = {
 607         &o2nm_cluster_attr_idle_timeout_ms.attr,
 608         &o2nm_cluster_attr_keepalive_delay_ms.attr,
 609         &o2nm_cluster_attr_reconnect_delay_ms.attr,
 610         NULL,
 611 };
 612 static ssize_t o2nm_cluster_show(struct config_item *item,
 613                                  struct configfs_attribute *attr,
 614                                  char *page)
 615 {
 616         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 617         struct o2nm_cluster_attribute *o2nm_cluster_attr =
 618                 container_of(attr, struct o2nm_cluster_attribute, attr);
 619         ssize_t ret = 0;
 620
 621         if (o2nm_cluster_attr->show)
 622                 ret = o2nm_cluster_attr->show(cluster, page);
 623         return ret;
 624 }
 625
 626 static ssize_t o2nm_cluster_store(struct config_item *item,
 627                                   struct configfs_attribute *attr,
 628                                   const char *page, size_t count)
 629 {
 630         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 631         struct o2nm_cluster_attribute *o2nm_cluster_attr =
 632                 container_of(attr, struct o2nm_cluster_attribute, attr);
 633         ssize_t ret;
 634
 635         if (o2nm_cluster_attr->store == NULL) {
 636                 ret = -EINVAL;
 637                 goto out;
 638         }
 639
 640         ret = o2nm_cluster_attr->store(cluster, page, count);
 641         if (ret < count)
 642                 goto out;
 643 out:
 644         return ret;
 645 }
 646
 647 static struct config_item *o2nm_node_group_make_item(struct config_group *group,
 648                                                      const char *name)
 649 {
 650         struct o2nm_node *node = NULL;
 651         struct config_item *ret = NULL;
 652
 653         if (strlen(name) > O2NM_MAX_NAME_LEN)
 654                 goto out; /* ENAMETOOLONG */
 655
 656         node = kzalloc(sizeof(struct o2nm_node), GFP_KERNEL);
 657         if (node == NULL)
 658                 goto out; /* ENOMEM */
 659
 660         strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
 661         config_item_init_type_name(&node->nd_item, name, &o2nm_node_type);
 662         spin_lock_init(&node->nd_lock);
 663
 664         ret = &node->nd_item;
 665
 666 out:
 667         if (ret == NULL)
 668                 kfree(node);
 669
 670         return ret;
 671 }
 672
 673 static void o2nm_node_group_drop_item(struct config_group *group,
 674                                       struct config_item *item)
 675 {
 676         struct o2nm_node *node = to_o2nm_node(item);
 677         struct o2nm_cluster *cluster = to_o2nm_cluster(group->cg_item.ci_parent);
 678
 679         o2net_disconnect_node(node);
 680
 681         if (cluster->cl_has_local &&
 682             (cluster->cl_local_node == node->nd_num)) {
 683                 cluster->cl_has_local = 0;
 684                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 685                 o2net_stop_listening(node);
 686         }
 687
 688         /* XXX call into net to stop this node from trading messages */
 689
 690         write_lock(&cluster->cl_nodes_lock);
 691
 692         /* XXX sloppy */
 693         if (node->nd_ipv4_address)
 694                 rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 695
 696         /* nd_num might be 0 if the node number hasn't been set.. */
 697         if (cluster->cl_nodes[node->nd_num] == node) {
 698                 cluster->cl_nodes[node->nd_num] = NULL;
 699                 clear_bit(node->nd_num, cluster->cl_nodes_bitmap);
 700         }
 701         write_unlock(&cluster->cl_nodes_lock);
 702
 703         config_item_put(item);
 704 }
 705
 706 static struct configfs_group_operations o2nm_node_group_group_ops = {
 707         .make_item      = o2nm_node_group_make_item,
 708         .drop_item      = o2nm_node_group_drop_item,
 709 };
 710
 711 static struct config_item_type o2nm_node_group_type = {
 712         .ct_group_ops   = &o2nm_node_group_group_ops,
 713         .ct_owner       = THIS_MODULE,
 714 };
 715
 716 /* cluster */
 717
 718 static void o2nm_cluster_release(struct config_item *item)
 719 {
 720         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 721
 722         kfree(cluster->cl_group.default_groups);
 723         kfree(cluster);
 724 }
 725
 726 static struct configfs_item_operations o2nm_cluster_item_ops = {
 727         .release        = o2nm_cluster_release,
 728         .show_attribute         = o2nm_cluster_show,
 729         .store_attribute        = o2nm_cluster_store,
 730 };
 731
 732 static struct config_item_type o2nm_cluster_type = {
 733         .ct_item_ops    = &o2nm_cluster_item_ops,
 734         .ct_attrs       = o2nm_cluster_attrs,
 735         .ct_owner       = THIS_MODULE,
 736 };
 737
 738 /* cluster set */
 739
 740 struct o2nm_cluster_group {
 741         struct configfs_subsystem cs_subsys;
 742         /* some stuff? */
 743 };
 744
 745 #if 0
 746 static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *group)
 747 {
 748         return group ?
 749                 container_of(to_configfs_subsystem(group), struct o2nm_cluster_group, cs_subsys)
 750                : NULL;
 751 }
 752 #endif
 753
 754 static struct config_group *o2nm_cluster_group_make_group(struct config_group *group,
 755                                                           const char *name)
 756 {
 757         struct o2nm_cluster *cluster = NULL;
 758         struct o2nm_node_group *ns = NULL;
 759         struct config_group *o2hb_group = NULL, *ret = NULL;
 760         void *defs = NULL;
 761
 762         /* this runs under the parent dir's i_mutex; there can be only
 763          * one caller in here at a time */
 764         if (o2nm_single_cluster)
 765                 goto out; /* ENOSPC */
 766
 767         cluster = kzalloc(sizeof(struct o2nm_cluster), GFP_KERNEL);
 768         ns = kzalloc(sizeof(struct o2nm_node_group), GFP_KERNEL);
 769         defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
 770         o2hb_group = o2hb_alloc_hb_set();
 771         if (cluster == NULL || ns == NULL || o2hb_group == NULL || defs == NULL)
 772                 goto out;
 773
 774         config_group_init_type_name(&cluster->cl_group, name,
 775                                     &o2nm_cluster_type);
 776         config_group_init_type_name(&ns->ns_group, "node",
 777                                     &o2nm_node_group_type);
 778
 779         cluster->cl_group.default_groups = defs;
 780         cluster->cl_group.default_groups[0] = &ns->ns_group;
 781         cluster->cl_group.default_groups[1] = o2hb_group;
 782         cluster->cl_group.default_groups[2] = NULL;
 783         rwlock_init(&cluster->cl_nodes_lock);
 784         cluster->cl_node_ip_tree = RB_ROOT;
 785         cluster->cl_reconnect_delay_ms = O2NET_RECONNECT_DELAY_MS_DEFAULT;
 786         cluster->cl_idle_timeout_ms    = O2NET_IDLE_TIMEOUT_MS_DEFAULT;
 787         cluster->cl_keepalive_delay_ms = O2NET_KEEPALIVE_DELAY_MS_DEFAULT;
 788
 789         ret = &cluster->cl_group;
 790         o2nm_single_cluster = cluster;
 791
 792 out:
 793         if (ret == NULL) {
 794                 kfree(cluster);
 795                 kfree(ns);
 796                 o2hb_free_hb_set(o2hb_group);
 797                 kfree(defs);
 798         }
 799
 800         return ret;
 801 }
 802
 803 static void o2nm_cluster_group_drop_item(struct config_group *group, struct config_item *item)
 804 {
 805         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 806         int i;
 807         struct config_item *killme;
 808
 809         BUG_ON(o2nm_single_cluster != cluster);
 810         o2nm_single_cluster = NULL;
 811
 812         for (i = 0; cluster->cl_group.default_groups[i]; i++) {
 813                 killme = &cluster->cl_group.default_groups[i]->cg_item;
 814                 cluster->cl_group.default_groups[i] = NULL;
 815                 config_item_put(killme);
 816         }
 817
 818         config_item_put(item);
 819 }
 820
 821 static struct configfs_group_operations o2nm_cluster_group_group_ops = {
 822         .make_group     = o2nm_cluster_group_make_group,
 823         .drop_item      = o2nm_cluster_group_drop_item,
 824 };
 825
 826 static struct config_item_type o2nm_cluster_group_type = {
 827         .ct_group_ops   = &o2nm_cluster_group_group_ops,
 828         .ct_owner       = THIS_MODULE,
 829 };
 830
 831 static struct o2nm_cluster_group o2nm_cluster_group = {
 832         .cs_subsys = {
 833                 .su_group = {
 834                         .cg_item = {
 835                                 .ci_namebuf = "cluster",
 836                                 .ci_type = &o2nm_cluster_group_type,
 837                         },
 838                 },
 839         },
 840 };
 841
 842 int o2nm_depend_item(struct config_item *item)
 843 {
 844         return configfs_depend_item(&o2nm_cluster_group.cs_subsys, item);
 845 }
 846
 847 void o2nm_undepend_item(struct config_item *item)
 848 {
 849         configfs_undepend_item(&o2nm_cluster_group.cs_subsys, item);
 850 }
 851
 852 int o2nm_depend_this_node(void)
 853 {
 854         int ret = 0;
 855         struct o2nm_node *local_node;
 856
 857         local_node = o2nm_get_node_by_num(o2nm_this_node());
 858         if (!local_node) {
 859                 ret = -EINVAL;
 860                 goto out;
 861         }
 862
 863         ret = o2nm_depend_item(&local_node->nd_item);
 864         o2nm_node_put(local_node);
 865
 866 out:
 867         return ret;
 868 }
 869
 870 void o2nm_undepend_this_node(void)
 871 {
 872         struct o2nm_node *local_node;
 873
 874         local_node = o2nm_get_node_by_num(o2nm_this_node());
 875         BUG_ON(!local_node);
 876
 877         o2nm_undepend_item(&local_node->nd_item);
 878         o2nm_node_put(local_node);
 879 }
 880
 881
 882 static void __exit exit_o2nm(void)
 883 {
 884         /* XXX sync with hb callbacks and shut down hb? */
 885         o2net_unregister_hb_callbacks();
 886         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 887         o2cb_sys_shutdown();
 888
 889         o2net_exit();
 890 }
 891
 892 static int __init init_o2nm(void)
 893 {
 894         int ret = -1;
 895
 896         cluster_print_version();
 897
 898         o2hb_init();
 899
 900         ret = o2net_init();
 901         if (ret)
 902                 goto out;
 903
 904         ret = o2net_register_hb_callbacks();
 905         if (ret)
 906                 goto out_o2net;
 907
 908         config_group_init(&o2nm_cluster_group.cs_subsys.su_group);
 909         mutex_init(&o2nm_cluster_group.cs_subsys.su_mutex);
 910         ret = configfs_register_subsystem(&o2nm_cluster_group.cs_subsys);
 911         if (ret) {
 912                 printk(KERN_ERR "nodemanager: Registration returned %d\n", ret);
 913                 goto out_callbacks;
 914         }
 915
 916         ret = o2cb_sys_init();
 917         if (!ret)
 918                 goto out;
 919
 920         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 921 out_callbacks:
 922         o2net_unregister_hb_callbacks();
 923 out_o2net:
 924         o2net_exit();
 925 out:
 926         return ret;
 927 }
 928
 929 MODULE_AUTHOR("Oracle");
 930 MODULE_LICENSE("GPL");
 931
 932 module_init(init_o2nm)
 933 module_exit(exit_o2nm)