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