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 "tcp.h"
  28 #include "nodemanager.h"
  29 #include "heartbeat.h"
  30 #include "masklog.h"
  31 #include "sys.h"
  32 #include "ver.h"
  33
  34 /* for now we operate under the assertion that there can be only one
  35  * cluster active at a time.  Changing this will require trickling
  36  * cluster references throughout where nodes are looked up */
  37 struct o2nm_cluster *o2nm_single_cluster = NULL;
  38
  39 #define OCFS2_MAX_HB_CTL_PATH 256
  40 static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
  41
  42 static ctl_table ocfs2_nm_table[] = {
  43         {
  44                 .ctl_name       = 1,
  45                 .procname       = "hb_ctl_path",
  46                 .data           = ocfs2_hb_ctl_path,
  47                 .maxlen         = OCFS2_MAX_HB_CTL_PATH,
  48                 .mode           = 0644,
  49                 .proc_handler   = &proc_dostring,
  50                 .strategy       = &sysctl_string,
  51         },
  52         { .ctl_name = 0 }
  53 };
  54
  55 static ctl_table ocfs2_mod_table[] = {
  56         {
  57                 .ctl_name       = FS_OCFS2_NM,
  58                 .procname       = "nm",
  59                 .data           = NULL,
  60                 .maxlen         = 0,
  61                 .mode           = 0555,
  62                 .child          = ocfs2_nm_table
  63         },
  64         { .ctl_name = 0}
  65 };
  66
  67 static ctl_table ocfs2_kern_table[] = {
  68         {
  69                 .ctl_name       = FS_OCFS2,
  70                 .procname       = "ocfs2",
  71                 .data           = NULL,
  72                 .maxlen         = 0,
  73                 .mode           = 0555,
  74                 .child          = ocfs2_mod_table
  75         },
  76         { .ctl_name = 0}
  77 };
  78
  79 static ctl_table ocfs2_root_table[] = {
  80         {
  81                 .ctl_name       = CTL_FS,
  82                 .procname       = "fs",
  83                 .data           = NULL,
  84                 .maxlen         = 0,
  85                 .mode           = 0555,
  86                 .child          = ocfs2_kern_table
  87         },
  88         { .ctl_name = 0 }
  89 };
  90
  91 static struct ctl_table_header *ocfs2_table_header = NULL;
  92
  93 const char *o2nm_get_hb_ctl_path(void)
  94 {
  95         return ocfs2_hb_ctl_path;
  96 }
  97 EXPORT_SYMBOL_GPL(o2nm_get_hb_ctl_path);
  98
  99 struct o2nm_node *o2nm_get_node_by_num(u8 node_num)
 100 {
 101         struct o2nm_node *node = NULL;
 102
 103         if (node_num >= O2NM_MAX_NODES || o2nm_single_cluster == NULL)
 104                 goto out;
 105
 106         read_lock(&o2nm_single_cluster->cl_nodes_lock);
 107         node = o2nm_single_cluster->cl_nodes[node_num];
 108         if (node)
 109                 config_item_get(&node->nd_item);
 110         read_unlock(&o2nm_single_cluster->cl_nodes_lock);
 111 out:
 112         return node;
 113 }
 114 EXPORT_SYMBOL_GPL(o2nm_get_node_by_num);
 115
 116 int o2nm_configured_node_map(unsigned long *map, unsigned bytes)
 117 {
 118         struct o2nm_cluster *cluster = o2nm_single_cluster;
 119
 120         BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap)));
 121
 122         if (cluster == NULL)
 123                 return -EINVAL;
 124
 125         read_lock(&cluster->cl_nodes_lock);
 126         memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap));
 127         read_unlock(&cluster->cl_nodes_lock);
 128
 129         return 0;
 130 }
 131 EXPORT_SYMBOL_GPL(o2nm_configured_node_map);
 132
 133 static struct o2nm_node *o2nm_node_ip_tree_lookup(struct o2nm_cluster *cluster,
 134                                                   __be32 ip_needle,
 135                                                   struct rb_node ***ret_p,
 136                                                   struct rb_node **ret_parent)
 137 {
 138         struct rb_node **p = &cluster->cl_node_ip_tree.rb_node;
 139         struct rb_node *parent = NULL;
 140         struct o2nm_node *node, *ret = NULL;
 141
 142         while (*p) {
 143                 int cmp;
 144
 145                 parent = *p;
 146                 node = rb_entry(parent, struct o2nm_node, nd_ip_node);
 147
 148                 cmp = memcmp(&ip_needle, &node->nd_ipv4_address,
 149                                 sizeof(ip_needle));
 150                 if (cmp < 0)
 151                         p = &(*p)->rb_left;
 152                 else if (cmp > 0)
 153                         p = &(*p)->rb_right;
 154                 else {
 155                         ret = node;
 156                         break;
 157                 }
 158         }
 159
 160         if (ret_p != NULL)
 161                 *ret_p = p;
 162         if (ret_parent != NULL)
 163                 *ret_parent = parent;
 164
 165         return ret;
 166 }
 167
 168 struct o2nm_node *o2nm_get_node_by_ip(__be32 addr)
 169 {
 170         struct o2nm_node *node = NULL;
 171         struct o2nm_cluster *cluster = o2nm_single_cluster;
 172
 173         if (cluster == NULL)
 174                 goto out;
 175
 176         read_lock(&cluster->cl_nodes_lock);
 177         node = o2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL);
 178         if (node)
 179                 config_item_get(&node->nd_item);
 180         read_unlock(&cluster->cl_nodes_lock);
 181
 182 out:
 183         return node;
 184 }
 185 EXPORT_SYMBOL_GPL(o2nm_get_node_by_ip);
 186
 187 void o2nm_node_put(struct o2nm_node *node)
 188 {
 189         config_item_put(&node->nd_item);
 190 }
 191 EXPORT_SYMBOL_GPL(o2nm_node_put);
 192
 193 void o2nm_node_get(struct o2nm_node *node)
 194 {
 195         config_item_get(&node->nd_item);
 196 }
 197 EXPORT_SYMBOL_GPL(o2nm_node_get);
 198
 199 u8 o2nm_this_node(void)
 200 {
 201         u8 node_num = O2NM_MAX_NODES;
 202
 203         if (o2nm_single_cluster && o2nm_single_cluster->cl_has_local)
 204                 node_num = o2nm_single_cluster->cl_local_node;
 205
 206         return node_num;
 207 }
 208 EXPORT_SYMBOL_GPL(o2nm_this_node);
 209
 210 /* node configfs bits */
 211
 212 static struct o2nm_cluster *to_o2nm_cluster(struct config_item *item)
 213 {
 214         return item ?
 215                 container_of(to_config_group(item), struct o2nm_cluster,
 216                              cl_group)
 217                 : NULL;
 218 }
 219
 220 static struct o2nm_node *to_o2nm_node(struct config_item *item)
 221 {
 222         return item ? container_of(item, struct o2nm_node, nd_item) : NULL;
 223 }
 224
 225 static void o2nm_node_release(struct config_item *item)
 226 {
 227         struct o2nm_node *node = to_o2nm_node(item);
 228         kfree(node);
 229 }
 230
 231 static ssize_t o2nm_node_num_read(struct o2nm_node *node, char *page)
 232 {
 233         return sprintf(page, "%d\n", node->nd_num);
 234 }
 235
 236 static struct o2nm_cluster *to_o2nm_cluster_from_node(struct o2nm_node *node)
 237 {
 238         /* through the first node_set .parent
 239          * mycluster/nodes/mynode == o2nm_cluster->o2nm_node_group->o2nm_node */
 240         return to_o2nm_cluster(node->nd_item.ci_parent->ci_parent);
 241 }
 242
 243 enum {
 244         O2NM_NODE_ATTR_NUM = 0,
 245         O2NM_NODE_ATTR_PORT,
 246         O2NM_NODE_ATTR_ADDRESS,
 247         O2NM_NODE_ATTR_LOCAL,
 248 };
 249
 250 static ssize_t o2nm_node_num_write(struct o2nm_node *node, const char *page,
 251                                    size_t count)
 252 {
 253         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
 254         unsigned long tmp;
 255         char *p = (char *)page;
 256
 257         tmp = simple_strtoul(p, &p, 0);
 258         if (!p || (*p && (*p != '\n')))
 259                 return -EINVAL;
 260
 261         if (tmp >= O2NM_MAX_NODES)
 262                 return -ERANGE;
 263
 264         /* once we're in the cl_nodes tree networking can look us up by
 265          * node number and try to use our address and port attributes
 266          * to connect to this node.. make sure that they've been set
 267          * before writing the node attribute? */
 268         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 269             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 270                 return -EINVAL; /* XXX */
 271
 272         write_lock(&cluster->cl_nodes_lock);
 273         if (cluster->cl_nodes[tmp])
 274                 p = NULL;
 275         else  {
 276                 cluster->cl_nodes[tmp] = node;
 277                 node->nd_num = tmp;
 278                 set_bit(tmp, cluster->cl_nodes_bitmap);
 279         }
 280         write_unlock(&cluster->cl_nodes_lock);
 281         if (p == NULL)
 282                 return -EEXIST;
 283
 284         return count;
 285 }
 286 static ssize_t o2nm_node_ipv4_port_read(struct o2nm_node *node, char *page)
 287 {
 288         return sprintf(page, "%u\n", ntohs(node->nd_ipv4_port));
 289 }
 290
 291 static ssize_t o2nm_node_ipv4_port_write(struct o2nm_node *node,
 292                                          const char *page, size_t count)
 293 {
 294         unsigned long tmp;
 295         char *p = (char *)page;
 296
 297         tmp = simple_strtoul(p, &p, 0);
 298         if (!p || (*p && (*p != '\n')))
 299                 return -EINVAL;
 300
 301         if (tmp == 0)
 302                 return -EINVAL;
 303         if (tmp >= (u16)-1)
 304                 return -ERANGE;
 305
 306         node->nd_ipv4_port = htons(tmp);
 307
 308         return count;
 309 }
 310
 311 static ssize_t o2nm_node_ipv4_address_read(struct o2nm_node *node, char *page)
 312 {
 313         return sprintf(page, "%u.%u.%u.%u\n", NIPQUAD(node->nd_ipv4_address));
 314 }
 315
 316 static ssize_t o2nm_node_ipv4_address_write(struct o2nm_node *node,
 317                                             const char *page,
 318                                             size_t count)
 319 {
 320         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
 321         int ret, i;
 322         struct rb_node **p, *parent;
 323         unsigned int octets[4];
 324         __be32 ipv4_addr = 0;
 325
 326         ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2],
 327                      &octets[1], &octets[0]);
 328         if (ret != 4)
 329                 return -EINVAL;
 330
 331         for (i = 0; i < ARRAY_SIZE(octets); i++) {
 332                 if (octets[i] > 255)
 333                         return -ERANGE;
 334                 be32_add_cpu(&ipv4_addr, octets[i] << (i * 8));
 335         }
 336
 337         ret = 0;
 338         write_lock(&cluster->cl_nodes_lock);
 339         if (o2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent))
 340                 ret = -EEXIST;
 341         else {
 342                 rb_link_node(&node->nd_ip_node, parent, p);
 343                 rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 344         }
 345         write_unlock(&cluster->cl_nodes_lock);
 346         if (ret)
 347                 return ret;
 348
 349         memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr));
 350
 351         return count;
 352 }
 353
 354 static ssize_t o2nm_node_local_read(struct o2nm_node *node, char *page)
 355 {
 356         return sprintf(page, "%d\n", node->nd_local);
 357 }
 358
 359 static ssize_t o2nm_node_local_write(struct o2nm_node *node, const char *page,
 360                                      size_t count)
 361 {
 362         struct o2nm_cluster *cluster = to_o2nm_cluster_from_node(node);
 363         unsigned long tmp;
 364         char *p = (char *)page;
 365         ssize_t ret;
 366
 367         tmp = simple_strtoul(p, &p, 0);
 368         if (!p || (*p && (*p != '\n')))
 369                 return -EINVAL;
 370
 371         tmp = !!tmp; /* boolean of whether this node wants to be local */
 372
 373         /* setting local turns on networking rx for now so we require having
 374          * set everything else first */
 375         if (!test_bit(O2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) ||
 376             !test_bit(O2NM_NODE_ATTR_NUM, &node->nd_set_attributes) ||
 377             !test_bit(O2NM_NODE_ATTR_PORT, &node->nd_set_attributes))
 378                 return -EINVAL; /* XXX */
 379
 380         /* the only failure case is trying to set a new local node
 381          * when a different one is already set */
 382         if (tmp && tmp == cluster->cl_has_local &&
 383             cluster->cl_local_node != node->nd_num)
 384                 return -EBUSY;
 385
 386         /* bring up the rx thread if we're setting the new local node. */
 387         if (tmp && !cluster->cl_has_local) {
 388                 ret = o2net_start_listening(node);
 389                 if (ret)
 390                         return ret;
 391         }
 392
 393         if (!tmp && cluster->cl_has_local &&
 394             cluster->cl_local_node == node->nd_num) {
 395                 o2net_stop_listening(node);
 396                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 397         }
 398
 399         node->nd_local = tmp;
 400         if (node->nd_local) {
 401                 cluster->cl_has_local = tmp;
 402                 cluster->cl_local_node = node->nd_num;
 403         }
 404
 405         return count;
 406 }
 407
 408 struct o2nm_node_attribute {
 409         struct configfs_attribute attr;
 410         ssize_t (*show)(struct o2nm_node *, char *);
 411         ssize_t (*store)(struct o2nm_node *, const char *, size_t);
 412 };
 413
 414 static struct o2nm_node_attribute o2nm_node_attr_num = {
 415         .attr   = { .ca_owner = THIS_MODULE,
 416                     .ca_name = "num",
 417                     .ca_mode = S_IRUGO | S_IWUSR },
 418         .show   = o2nm_node_num_read,
 419         .store  = o2nm_node_num_write,
 420 };
 421
 422 static struct o2nm_node_attribute o2nm_node_attr_ipv4_port = {
 423         .attr   = { .ca_owner = THIS_MODULE,
 424                     .ca_name = "ipv4_port",
 425                     .ca_mode = S_IRUGO | S_IWUSR },
 426         .show   = o2nm_node_ipv4_port_read,
 427         .store  = o2nm_node_ipv4_port_write,
 428 };
 429
 430 static struct o2nm_node_attribute o2nm_node_attr_ipv4_address = {
 431         .attr   = { .ca_owner = THIS_MODULE,
 432                     .ca_name = "ipv4_address",
 433                     .ca_mode = S_IRUGO | S_IWUSR },
 434         .show   = o2nm_node_ipv4_address_read,
 435         .store  = o2nm_node_ipv4_address_write,
 436 };
 437
 438 static struct o2nm_node_attribute o2nm_node_attr_local = {
 439         .attr   = { .ca_owner = THIS_MODULE,
 440                     .ca_name = "local",
 441                     .ca_mode = S_IRUGO | S_IWUSR },
 442         .show   = o2nm_node_local_read,
 443         .store  = o2nm_node_local_write,
 444 };
 445
 446 static struct configfs_attribute *o2nm_node_attrs[] = {
 447         [O2NM_NODE_ATTR_NUM] = &o2nm_node_attr_num.attr,
 448         [O2NM_NODE_ATTR_PORT] = &o2nm_node_attr_ipv4_port.attr,
 449         [O2NM_NODE_ATTR_ADDRESS] = &o2nm_node_attr_ipv4_address.attr,
 450         [O2NM_NODE_ATTR_LOCAL] = &o2nm_node_attr_local.attr,
 451         NULL,
 452 };
 453
 454 static int o2nm_attr_index(struct configfs_attribute *attr)
 455 {
 456         int i;
 457         for (i = 0; i < ARRAY_SIZE(o2nm_node_attrs); i++) {
 458                 if (attr == o2nm_node_attrs[i])
 459                         return i;
 460         }
 461         BUG();
 462         return 0;
 463 }
 464
 465 static ssize_t o2nm_node_show(struct config_item *item,
 466                               struct configfs_attribute *attr,
 467                               char *page)
 468 {
 469         struct o2nm_node *node = to_o2nm_node(item);
 470         struct o2nm_node_attribute *o2nm_node_attr =
 471                 container_of(attr, struct o2nm_node_attribute, attr);
 472         ssize_t ret = 0;
 473
 474         if (o2nm_node_attr->show)
 475                 ret = o2nm_node_attr->show(node, page);
 476         return ret;
 477 }
 478
 479 static ssize_t o2nm_node_store(struct config_item *item,
 480                                struct configfs_attribute *attr,
 481                                const char *page, size_t count)
 482 {
 483         struct o2nm_node *node = to_o2nm_node(item);
 484         struct o2nm_node_attribute *o2nm_node_attr =
 485                 container_of(attr, struct o2nm_node_attribute, attr);
 486         ssize_t ret;
 487         int attr_index = o2nm_attr_index(attr);
 488
 489         if (o2nm_node_attr->store == NULL) {
 490                 ret = -EINVAL;
 491                 goto out;
 492         }
 493
 494         if (test_bit(attr_index, &node->nd_set_attributes))
 495                 return -EBUSY;
 496
 497         ret = o2nm_node_attr->store(node, page, count);
 498         if (ret < count)
 499                 goto out;
 500
 501         set_bit(attr_index, &node->nd_set_attributes);
 502 out:
 503         return ret;
 504 }
 505
 506 static struct configfs_item_operations o2nm_node_item_ops = {
 507         .release                = o2nm_node_release,
 508         .show_attribute         = o2nm_node_show,
 509         .store_attribute        = o2nm_node_store,
 510 };
 511
 512 static struct config_item_type o2nm_node_type = {
 513         .ct_item_ops    = &o2nm_node_item_ops,
 514         .ct_attrs       = o2nm_node_attrs,
 515         .ct_owner       = THIS_MODULE,
 516 };
 517
 518 /* node set */
 519
 520 struct o2nm_node_group {
 521         struct config_group ns_group;
 522         /* some stuff? */
 523 };
 524
 525 #if 0
 526 static struct o2nm_node_group *to_o2nm_node_group(struct config_group *group)
 527 {
 528         return group ?
 529                 container_of(group, struct o2nm_node_group, ns_group)
 530                 : NULL;
 531 }
 532 #endif
 533
 534 struct o2nm_cluster_attribute {
 535         struct configfs_attribute attr;
 536         ssize_t (*show)(struct o2nm_cluster *, char *);
 537         ssize_t (*store)(struct o2nm_cluster *, const char *, size_t);
 538 };
 539
 540 static ssize_t o2nm_cluster_attr_write(const char *page, ssize_t count,
 541                                        unsigned int *val)
 542 {
 543         unsigned long tmp;
 544         char *p = (char *)page;
 545
 546         tmp = simple_strtoul(p, &p, 0);
 547         if (!p || (*p && (*p != '\n')))
 548                 return -EINVAL;
 549
 550         if (tmp == 0)
 551                 return -EINVAL;
 552         if (tmp >= (u32)-1)
 553                 return -ERANGE;
 554
 555         *val = tmp;
 556
 557         return count;
 558 }
 559
 560 static ssize_t o2nm_cluster_attr_idle_timeout_ms_read(
 561         struct o2nm_cluster *cluster, char *page)
 562 {
 563         return sprintf(page, "%u\n", cluster->cl_idle_timeout_ms);
 564 }
 565
 566 static ssize_t o2nm_cluster_attr_idle_timeout_ms_write(
 567         struct o2nm_cluster *cluster, const char *page, size_t count)
 568 {
 569         ssize_t ret;
 570         unsigned int val;
 571
 572         ret =  o2nm_cluster_attr_write(page, count, &val);
 573
 574         if (ret > 0) {
 575                 if (cluster->cl_idle_timeout_ms != val
 576                         && o2net_num_connected_peers()) {
 577                         mlog(ML_NOTICE,
 578                              "o2net: cannot change idle timeout after "
 579                              "the first peer has agreed to it."
 580                              "  %d connected peers\n",
 581                              o2net_num_connected_peers());
 582                         ret = -EINVAL;
 583                 } else if (val <= cluster->cl_keepalive_delay_ms) {
 584                         mlog(ML_NOTICE, "o2net: idle timeout must be larger "
 585                              "than keepalive delay\n");
 586                         ret = -EINVAL;
 587                 } else {
 588                         cluster->cl_idle_timeout_ms = val;
 589                 }
 590         }
 591
 592         return ret;
 593 }
 594
 595 static ssize_t o2nm_cluster_attr_keepalive_delay_ms_read(
 596         struct o2nm_cluster *cluster, char *page)
 597 {
 598         return sprintf(page, "%u\n", cluster->cl_keepalive_delay_ms);
 599 }
 600
 601 static ssize_t o2nm_cluster_attr_keepalive_delay_ms_write(
 602         struct o2nm_cluster *cluster, const char *page, size_t count)
 603 {
 604         ssize_t ret;
 605         unsigned int val;
 606
 607         ret =  o2nm_cluster_attr_write(page, count, &val);
 608
 609         if (ret > 0) {
 610                 if (cluster->cl_keepalive_delay_ms != val
 611                     && o2net_num_connected_peers()) {
 612                         mlog(ML_NOTICE,
 613                              "o2net: cannot change keepalive delay after"
 614                              " the first peer has agreed to it."
 615                              "  %d connected peers\n",
 616                              o2net_num_connected_peers());
 617                         ret = -EINVAL;
 618                 } else if (val >= cluster->cl_idle_timeout_ms) {
 619                         mlog(ML_NOTICE, "o2net: keepalive delay must be "
 620                              "smaller than idle timeout\n");
 621                         ret = -EINVAL;
 622                 } else {
 623                         cluster->cl_keepalive_delay_ms = val;
 624                 }
 625         }
 626
 627         return ret;
 628 }
 629
 630 static ssize_t o2nm_cluster_attr_reconnect_delay_ms_read(
 631         struct o2nm_cluster *cluster, char *page)
 632 {
 633         return sprintf(page, "%u\n", cluster->cl_reconnect_delay_ms);
 634 }
 635
 636 static ssize_t o2nm_cluster_attr_reconnect_delay_ms_write(
 637         struct o2nm_cluster *cluster, const char *page, size_t count)
 638 {
 639         return o2nm_cluster_attr_write(page, count,
 640                                        &cluster->cl_reconnect_delay_ms);
 641 }
 642 static struct o2nm_cluster_attribute o2nm_cluster_attr_idle_timeout_ms = {
 643         .attr   = { .ca_owner = THIS_MODULE,
 644                     .ca_name = "idle_timeout_ms",
 645                     .ca_mode = S_IRUGO | S_IWUSR },
 646         .show   = o2nm_cluster_attr_idle_timeout_ms_read,
 647         .store  = o2nm_cluster_attr_idle_timeout_ms_write,
 648 };
 649
 650 static struct o2nm_cluster_attribute o2nm_cluster_attr_keepalive_delay_ms = {
 651         .attr   = { .ca_owner = THIS_MODULE,
 652                     .ca_name = "keepalive_delay_ms",
 653                     .ca_mode = S_IRUGO | S_IWUSR },
 654         .show   = o2nm_cluster_attr_keepalive_delay_ms_read,
 655         .store  = o2nm_cluster_attr_keepalive_delay_ms_write,
 656 };
 657
 658 static struct o2nm_cluster_attribute o2nm_cluster_attr_reconnect_delay_ms = {
 659         .attr   = { .ca_owner = THIS_MODULE,
 660                     .ca_name = "reconnect_delay_ms",
 661                     .ca_mode = S_IRUGO | S_IWUSR },
 662         .show   = o2nm_cluster_attr_reconnect_delay_ms_read,
 663         .store  = o2nm_cluster_attr_reconnect_delay_ms_write,
 664 };
 665
 666 static struct configfs_attribute *o2nm_cluster_attrs[] = {
 667         &o2nm_cluster_attr_idle_timeout_ms.attr,
 668         &o2nm_cluster_attr_keepalive_delay_ms.attr,
 669         &o2nm_cluster_attr_reconnect_delay_ms.attr,
 670         NULL,
 671 };
 672 static ssize_t o2nm_cluster_show(struct config_item *item,
 673                                  struct configfs_attribute *attr,
 674                                  char *page)
 675 {
 676         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 677         struct o2nm_cluster_attribute *o2nm_cluster_attr =
 678                 container_of(attr, struct o2nm_cluster_attribute, attr);
 679         ssize_t ret = 0;
 680
 681         if (o2nm_cluster_attr->show)
 682                 ret = o2nm_cluster_attr->show(cluster, page);
 683         return ret;
 684 }
 685
 686 static ssize_t o2nm_cluster_store(struct config_item *item,
 687                                   struct configfs_attribute *attr,
 688                                   const char *page, size_t count)
 689 {
 690         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 691         struct o2nm_cluster_attribute *o2nm_cluster_attr =
 692                 container_of(attr, struct o2nm_cluster_attribute, attr);
 693         ssize_t ret;
 694
 695         if (o2nm_cluster_attr->store == NULL) {
 696                 ret = -EINVAL;
 697                 goto out;
 698         }
 699
 700         ret = o2nm_cluster_attr->store(cluster, page, count);
 701         if (ret < count)
 702                 goto out;
 703 out:
 704         return ret;
 705 }
 706
 707 static struct config_item *o2nm_node_group_make_item(struct config_group *group,
 708                                                      const char *name)
 709 {
 710         struct o2nm_node *node = NULL;
 711         struct config_item *ret = NULL;
 712
 713         if (strlen(name) > O2NM_MAX_NAME_LEN)
 714                 goto out; /* ENAMETOOLONG */
 715
 716         node = kzalloc(sizeof(struct o2nm_node), GFP_KERNEL);
 717         if (node == NULL)
 718                 goto out; /* ENOMEM */
 719
 720         strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */
 721         config_item_init_type_name(&node->nd_item, name, &o2nm_node_type);
 722         spin_lock_init(&node->nd_lock);
 723
 724         ret = &node->nd_item;
 725
 726 out:
 727         if (ret == NULL)
 728                 kfree(node);
 729
 730         return ret;
 731 }
 732
 733 static void o2nm_node_group_drop_item(struct config_group *group,
 734                                       struct config_item *item)
 735 {
 736         struct o2nm_node *node = to_o2nm_node(item);
 737         struct o2nm_cluster *cluster = to_o2nm_cluster(group->cg_item.ci_parent);
 738
 739         o2net_disconnect_node(node);
 740
 741         if (cluster->cl_has_local &&
 742             (cluster->cl_local_node == node->nd_num)) {
 743                 cluster->cl_has_local = 0;
 744                 cluster->cl_local_node = O2NM_INVALID_NODE_NUM;
 745                 o2net_stop_listening(node);
 746         }
 747
 748         /* XXX call into net to stop this node from trading messages */
 749
 750         write_lock(&cluster->cl_nodes_lock);
 751
 752         /* XXX sloppy */
 753         if (node->nd_ipv4_address)
 754                 rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree);
 755
 756         /* nd_num might be 0 if the node number hasn't been set.. */
 757         if (cluster->cl_nodes[node->nd_num] == node) {
 758                 cluster->cl_nodes[node->nd_num] = NULL;
 759                 clear_bit(node->nd_num, cluster->cl_nodes_bitmap);
 760         }
 761         write_unlock(&cluster->cl_nodes_lock);
 762
 763         config_item_put(item);
 764 }
 765
 766 static struct configfs_group_operations o2nm_node_group_group_ops = {
 767         .make_item      = o2nm_node_group_make_item,
 768         .drop_item      = o2nm_node_group_drop_item,
 769 };
 770
 771 static struct config_item_type o2nm_node_group_type = {
 772         .ct_group_ops   = &o2nm_node_group_group_ops,
 773         .ct_owner       = THIS_MODULE,
 774 };
 775
 776 /* cluster */
 777
 778 static void o2nm_cluster_release(struct config_item *item)
 779 {
 780         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 781
 782         kfree(cluster->cl_group.default_groups);
 783         kfree(cluster);
 784 }
 785
 786 static struct configfs_item_operations o2nm_cluster_item_ops = {
 787         .release        = o2nm_cluster_release,
 788         .show_attribute         = o2nm_cluster_show,
 789         .store_attribute        = o2nm_cluster_store,
 790 };
 791
 792 static struct config_item_type o2nm_cluster_type = {
 793         .ct_item_ops    = &o2nm_cluster_item_ops,
 794         .ct_attrs       = o2nm_cluster_attrs,
 795         .ct_owner       = THIS_MODULE,
 796 };
 797
 798 /* cluster set */
 799
 800 struct o2nm_cluster_group {
 801         struct configfs_subsystem cs_subsys;
 802         /* some stuff? */
 803 };
 804
 805 #if 0
 806 static struct o2nm_cluster_group *to_o2nm_cluster_group(struct config_group *group)
 807 {
 808         return group ?
 809                 container_of(to_configfs_subsystem(group), struct o2nm_cluster_group, cs_subsys)
 810                : NULL;
 811 }
 812 #endif
 813
 814 static struct config_group *o2nm_cluster_group_make_group(struct config_group *group,
 815                                                           const char *name)
 816 {
 817         struct o2nm_cluster *cluster = NULL;
 818         struct o2nm_node_group *ns = NULL;
 819         struct config_group *o2hb_group = NULL, *ret = NULL;
 820         void *defs = NULL;
 821
 822         /* this runs under the parent dir's i_mutex; there can be only
 823          * one caller in here at a time */
 824         if (o2nm_single_cluster)
 825                 goto out; /* ENOSPC */
 826
 827         cluster = kzalloc(sizeof(struct o2nm_cluster), GFP_KERNEL);
 828         ns = kzalloc(sizeof(struct o2nm_node_group), GFP_KERNEL);
 829         defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
 830         o2hb_group = o2hb_alloc_hb_set();
 831         if (cluster == NULL || ns == NULL || o2hb_group == NULL || defs == NULL)
 832                 goto out;
 833
 834         config_group_init_type_name(&cluster->cl_group, name,
 835                                     &o2nm_cluster_type);
 836         config_group_init_type_name(&ns->ns_group, "node",
 837                                     &o2nm_node_group_type);
 838
 839         cluster->cl_group.default_groups = defs;
 840         cluster->cl_group.default_groups[0] = &ns->ns_group;
 841         cluster->cl_group.default_groups[1] = o2hb_group;
 842         cluster->cl_group.default_groups[2] = NULL;
 843         rwlock_init(&cluster->cl_nodes_lock);
 844         cluster->cl_node_ip_tree = RB_ROOT;
 845         cluster->cl_reconnect_delay_ms = O2NET_RECONNECT_DELAY_MS_DEFAULT;
 846         cluster->cl_idle_timeout_ms    = O2NET_IDLE_TIMEOUT_MS_DEFAULT;
 847         cluster->cl_keepalive_delay_ms = O2NET_KEEPALIVE_DELAY_MS_DEFAULT;
 848
 849         ret = &cluster->cl_group;
 850         o2nm_single_cluster = cluster;
 851
 852 out:
 853         if (ret == NULL) {
 854                 kfree(cluster);
 855                 kfree(ns);
 856                 o2hb_free_hb_set(o2hb_group);
 857                 kfree(defs);
 858         }
 859
 860         return ret;
 861 }
 862
 863 static void o2nm_cluster_group_drop_item(struct config_group *group, struct config_item *item)
 864 {
 865         struct o2nm_cluster *cluster = to_o2nm_cluster(item);
 866         int i;
 867         struct config_item *killme;
 868
 869         BUG_ON(o2nm_single_cluster != cluster);
 870         o2nm_single_cluster = NULL;
 871
 872         for (i = 0; cluster->cl_group.default_groups[i]; i++) {
 873                 killme = &cluster->cl_group.default_groups[i]->cg_item;
 874                 cluster->cl_group.default_groups[i] = NULL;
 875                 config_item_put(killme);
 876         }
 877
 878         config_item_put(item);
 879 }
 880
 881 static struct configfs_group_operations o2nm_cluster_group_group_ops = {
 882         .make_group     = o2nm_cluster_group_make_group,
 883         .drop_item      = o2nm_cluster_group_drop_item,
 884 };
 885
 886 static struct config_item_type o2nm_cluster_group_type = {
 887         .ct_group_ops   = &o2nm_cluster_group_group_ops,
 888         .ct_owner       = THIS_MODULE,
 889 };
 890
 891 static struct o2nm_cluster_group o2nm_cluster_group = {
 892         .cs_subsys = {
 893                 .su_group = {
 894                         .cg_item = {
 895                                 .ci_namebuf = "cluster",
 896                                 .ci_type = &o2nm_cluster_group_type,
 897                         },
 898                 },
 899         },
 900 };
 901
 902 int o2nm_depend_item(struct config_item *item)
 903 {
 904         return configfs_depend_item(&o2nm_cluster_group.cs_subsys, item);
 905 }
 906
 907 void o2nm_undepend_item(struct config_item *item)
 908 {
 909         configfs_undepend_item(&o2nm_cluster_group.cs_subsys, item);
 910 }
 911
 912 int o2nm_depend_this_node(void)
 913 {
 914         int ret = 0;
 915         struct o2nm_node *local_node;
 916
 917         local_node = o2nm_get_node_by_num(o2nm_this_node());
 918         if (!local_node) {
 919                 ret = -EINVAL;
 920                 goto out;
 921         }
 922
 923         ret = o2nm_depend_item(&local_node->nd_item);
 924         o2nm_node_put(local_node);
 925
 926 out:
 927         return ret;
 928 }
 929
 930 void o2nm_undepend_this_node(void)
 931 {
 932         struct o2nm_node *local_node;
 933
 934         local_node = o2nm_get_node_by_num(o2nm_this_node());
 935         BUG_ON(!local_node);
 936
 937         o2nm_undepend_item(&local_node->nd_item);
 938         o2nm_node_put(local_node);
 939 }
 940
 941
 942 static void __exit exit_o2nm(void)
 943 {
 944         if (ocfs2_table_header)
 945                 unregister_sysctl_table(ocfs2_table_header);
 946
 947         /* XXX sync with hb callbacks and shut down hb? */
 948         o2net_unregister_hb_callbacks();
 949         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 950         o2cb_sys_shutdown();
 951
 952         o2net_exit();
 953 }
 954
 955 static int __init init_o2nm(void)
 956 {
 957         int ret = -1;
 958
 959         cluster_print_version();
 960
 961         o2hb_init();
 962
 963         ret = o2net_init();
 964         if (ret)
 965                 goto out;
 966
 967         ocfs2_table_header = register_sysctl_table(ocfs2_root_table);
 968         if (!ocfs2_table_header) {
 969                 printk(KERN_ERR "nodemanager: unable to register sysctl\n");
 970                 ret = -ENOMEM; /* or something. */
 971                 goto out_o2net;
 972         }
 973
 974         ret = o2net_register_hb_callbacks();
 975         if (ret)
 976                 goto out_sysctl;
 977
 978         config_group_init(&o2nm_cluster_group.cs_subsys.su_group);
 979         mutex_init(&o2nm_cluster_group.cs_subsys.su_mutex);
 980         ret = configfs_register_subsystem(&o2nm_cluster_group.cs_subsys);
 981         if (ret) {
 982                 printk(KERN_ERR "nodemanager: Registration returned %d\n", ret);
 983                 goto out_callbacks;
 984         }
 985
 986         ret = o2cb_sys_init();
 987         if (!ret)
 988                 goto out;
 989
 990         configfs_unregister_subsystem(&o2nm_cluster_group.cs_subsys);
 991 out_callbacks:
 992         o2net_unregister_hb_callbacks();
 993 out_sysctl:
 994         unregister_sysctl_table(ocfs2_table_header);
 995 out_o2net:
 996         o2net_exit();
 997 out:
 998         return ret;
 999 }
1000
1001 MODULE_AUTHOR("Oracle");
1002 MODULE_LICENSE("GPL");
1003
1004 module_init(init_o2nm)
1005 module_exit(exit_o2nm)