fs/dlm/config.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   6 **
   7 **  This copyrighted material is made available to anyone wishing to use,
   8 **  modify, copy, or redistribute it subject to the terms and conditions
   9 **  of the GNU General Public License v.2.
  10 **
  11 *******************************************************************************
  12 ******************************************************************************/
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/configfs.h>
  17 #include <linux/in.h>
  18 #include <linux/in6.h>
  19 #include <net/ipv6.h>
  20 #include <net/sock.h>
  21
  22 #include "config.h"
  23 #include "lowcomms.h"
  24
  25 /*
  26  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  28  * /config/dlm/<cluster>/comms/<comm>/nodeid
  29  * /config/dlm/<cluster>/comms/<comm>/local
  30  * /config/dlm/<cluster>/comms/<comm>/addr
  31  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  32  */
  33
  34 static struct config_group *space_list;
  35 static struct config_group *comm_list;
  36 static struct dlm_comm *local_comm;
  37
  38 struct dlm_clusters;
  39 struct dlm_cluster;
  40 struct dlm_spaces;
  41 struct dlm_space;
  42 struct dlm_comms;
  43 struct dlm_comm;
  44 struct dlm_nodes;
  45 struct dlm_node;
  46
  47 static struct config_group *make_cluster(struct config_group *, const char *);
  48 static void drop_cluster(struct config_group *, struct config_item *);
  49 static void release_cluster(struct config_item *);
  50 static struct config_group *make_space(struct config_group *, const char *);
  51 static void drop_space(struct config_group *, struct config_item *);
  52 static void release_space(struct config_item *);
  53 static struct config_item *make_comm(struct config_group *, const char *);
  54 static void drop_comm(struct config_group *, struct config_item *);
  55 static void release_comm(struct config_item *);
  56 static struct config_item *make_node(struct config_group *, const char *);
  57 static void drop_node(struct config_group *, struct config_item *);
  58 static void release_node(struct config_item *);
  59
  60 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
  61                             char *buf);
  62 static ssize_t store_cluster(struct config_item *i,
  63                              struct configfs_attribute *a,
  64                              const char *buf, size_t len);
  65 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
  66                          char *buf);
  67 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
  68                           const char *buf, size_t len);
  69 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
  70                          char *buf);
  71 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
  72                           const char *buf, size_t len);
  73
  74 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
  75 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
  76                                 size_t len);
  77 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
  78 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
  79                                 size_t len);
  80 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
  81                                 size_t len);
  82 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
  83 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
  84                                 size_t len);
  85 static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
  86 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
  87                                 size_t len);
  88
  89 struct dlm_cluster {
  90         struct config_group group;
  91         unsigned int cl_tcp_port;
  92         unsigned int cl_buffer_size;
  93         unsigned int cl_rsbtbl_size;
  94         unsigned int cl_lkbtbl_size;
  95         unsigned int cl_dirtbl_size;
  96         unsigned int cl_recover_timer;
  97         unsigned int cl_toss_secs;
  98         unsigned int cl_scan_secs;
  99         unsigned int cl_log_debug;
 100         unsigned int cl_protocol;
 101         unsigned int cl_timewarn_cs;
 102 };
 103
 104 enum {
 105         CLUSTER_ATTR_TCP_PORT = 0,
 106         CLUSTER_ATTR_BUFFER_SIZE,
 107         CLUSTER_ATTR_RSBTBL_SIZE,
 108         CLUSTER_ATTR_LKBTBL_SIZE,
 109         CLUSTER_ATTR_DIRTBL_SIZE,
 110         CLUSTER_ATTR_RECOVER_TIMER,
 111         CLUSTER_ATTR_TOSS_SECS,
 112         CLUSTER_ATTR_SCAN_SECS,
 113         CLUSTER_ATTR_LOG_DEBUG,
 114         CLUSTER_ATTR_PROTOCOL,
 115         CLUSTER_ATTR_TIMEWARN_CS,
 116 };
 117
 118 struct cluster_attribute {
 119         struct configfs_attribute attr;
 120         ssize_t (*show)(struct dlm_cluster *, char *);
 121         ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
 122 };
 123
 124 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 125                            int *info_field, int check_zero,
 126                            const char *buf, size_t len)
 127 {
 128         unsigned int x;
 129
 130         if (!capable(CAP_SYS_ADMIN))
 131                 return -EACCES;
 132
 133         x = simple_strtoul(buf, NULL, 0);
 134
 135         if (check_zero && !x)
 136                 return -EINVAL;
 137
 138         *cl_field = x;
 139         *info_field = x;
 140
 141         return len;
 142 }
 143
 144 #define CLUSTER_ATTR(name, check_zero)                                        \
 145 static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
 146 {                                                                             \
 147         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 148                            check_zero, buf, len);                             \
 149 }                                                                             \
 150 static ssize_t name##_read(struct dlm_cluster *cl, char *buf)                 \
 151 {                                                                             \
 152         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 153 }                                                                             \
 154 static struct cluster_attribute cluster_attr_##name =                         \
 155 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
 156
 157 CLUSTER_ATTR(tcp_port, 1);
 158 CLUSTER_ATTR(buffer_size, 1);
 159 CLUSTER_ATTR(rsbtbl_size, 1);
 160 CLUSTER_ATTR(lkbtbl_size, 1);
 161 CLUSTER_ATTR(dirtbl_size, 1);
 162 CLUSTER_ATTR(recover_timer, 1);
 163 CLUSTER_ATTR(toss_secs, 1);
 164 CLUSTER_ATTR(scan_secs, 1);
 165 CLUSTER_ATTR(log_debug, 0);
 166 CLUSTER_ATTR(protocol, 0);
 167 CLUSTER_ATTR(timewarn_cs, 1);
 168
 169 static struct configfs_attribute *cluster_attrs[] = {
 170         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
 171         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
 172         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
 173         [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
 174         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
 175         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
 176         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
 177         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
 178         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
 179         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
 180         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
 181         NULL,
 182 };
 183
 184 enum {
 185         COMM_ATTR_NODEID = 0,
 186         COMM_ATTR_LOCAL,
 187         COMM_ATTR_ADDR,
 188 };
 189
 190 struct comm_attribute {
 191         struct configfs_attribute attr;
 192         ssize_t (*show)(struct dlm_comm *, char *);
 193         ssize_t (*store)(struct dlm_comm *, const char *, size_t);
 194 };
 195
 196 static struct comm_attribute comm_attr_nodeid = {
 197         .attr   = { .ca_owner = THIS_MODULE,
 198                     .ca_name = "nodeid",
 199                     .ca_mode = S_IRUGO | S_IWUSR },
 200         .show   = comm_nodeid_read,
 201         .store  = comm_nodeid_write,
 202 };
 203
 204 static struct comm_attribute comm_attr_local = {
 205         .attr   = { .ca_owner = THIS_MODULE,
 206                     .ca_name = "local",
 207                     .ca_mode = S_IRUGO | S_IWUSR },
 208         .show   = comm_local_read,
 209         .store  = comm_local_write,
 210 };
 211
 212 static struct comm_attribute comm_attr_addr = {
 213         .attr   = { .ca_owner = THIS_MODULE,
 214                     .ca_name = "addr",
 215                     .ca_mode = S_IRUGO | S_IWUSR },
 216         .store  = comm_addr_write,
 217 };
 218
 219 static struct configfs_attribute *comm_attrs[] = {
 220         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
 221         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
 222         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
 223         NULL,
 224 };
 225
 226 enum {
 227         NODE_ATTR_NODEID = 0,
 228         NODE_ATTR_WEIGHT,
 229 };
 230
 231 struct node_attribute {
 232         struct configfs_attribute attr;
 233         ssize_t (*show)(struct dlm_node *, char *);
 234         ssize_t (*store)(struct dlm_node *, const char *, size_t);
 235 };
 236
 237 static struct node_attribute node_attr_nodeid = {
 238         .attr   = { .ca_owner = THIS_MODULE,
 239                     .ca_name = "nodeid",
 240                     .ca_mode = S_IRUGO | S_IWUSR },
 241         .show   = node_nodeid_read,
 242         .store  = node_nodeid_write,
 243 };
 244
 245 static struct node_attribute node_attr_weight = {
 246         .attr   = { .ca_owner = THIS_MODULE,
 247                     .ca_name = "weight",
 248                     .ca_mode = S_IRUGO | S_IWUSR },
 249         .show   = node_weight_read,
 250         .store  = node_weight_write,
 251 };
 252
 253 static struct configfs_attribute *node_attrs[] = {
 254         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
 255         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
 256         NULL,
 257 };
 258
 259 struct dlm_clusters {
 260         struct configfs_subsystem subsys;
 261 };
 262
 263 struct dlm_spaces {
 264         struct config_group ss_group;
 265 };
 266
 267 struct dlm_space {
 268         struct config_group group;
 269         struct list_head members;
 270         struct mutex members_lock;
 271         int members_count;
 272 };
 273
 274 struct dlm_comms {
 275         struct config_group cs_group;
 276 };
 277
 278 struct dlm_comm {
 279         struct config_item item;
 280         int nodeid;
 281         int local;
 282         int addr_count;
 283         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 284 };
 285
 286 struct dlm_nodes {
 287         struct config_group ns_group;
 288 };
 289
 290 struct dlm_node {
 291         struct config_item item;
 292         struct list_head list; /* space->members */
 293         int nodeid;
 294         int weight;
 295         int new;
 296 };
 297
 298 static struct configfs_group_operations clusters_ops = {
 299         .make_group = make_cluster,
 300         .drop_item = drop_cluster,
 301 };
 302
 303 static struct configfs_item_operations cluster_ops = {
 304         .release = release_cluster,
 305         .show_attribute = show_cluster,
 306         .store_attribute = store_cluster,
 307 };
 308
 309 static struct configfs_group_operations spaces_ops = {
 310         .make_group = make_space,
 311         .drop_item = drop_space,
 312 };
 313
 314 static struct configfs_item_operations space_ops = {
 315         .release = release_space,
 316 };
 317
 318 static struct configfs_group_operations comms_ops = {
 319         .make_item = make_comm,
 320         .drop_item = drop_comm,
 321 };
 322
 323 static struct configfs_item_operations comm_ops = {
 324         .release = release_comm,
 325         .show_attribute = show_comm,
 326         .store_attribute = store_comm,
 327 };
 328
 329 static struct configfs_group_operations nodes_ops = {
 330         .make_item = make_node,
 331         .drop_item = drop_node,
 332 };
 333
 334 static struct configfs_item_operations node_ops = {
 335         .release = release_node,
 336         .show_attribute = show_node,
 337         .store_attribute = store_node,
 338 };
 339
 340 static struct config_item_type clusters_type = {
 341         .ct_group_ops = &clusters_ops,
 342         .ct_owner = THIS_MODULE,
 343 };
 344
 345 static struct config_item_type cluster_type = {
 346         .ct_item_ops = &cluster_ops,
 347         .ct_attrs = cluster_attrs,
 348         .ct_owner = THIS_MODULE,
 349 };
 350
 351 static struct config_item_type spaces_type = {
 352         .ct_group_ops = &spaces_ops,
 353         .ct_owner = THIS_MODULE,
 354 };
 355
 356 static struct config_item_type space_type = {
 357         .ct_item_ops = &space_ops,
 358         .ct_owner = THIS_MODULE,
 359 };
 360
 361 static struct config_item_type comms_type = {
 362         .ct_group_ops = &comms_ops,
 363         .ct_owner = THIS_MODULE,
 364 };
 365
 366 static struct config_item_type comm_type = {
 367         .ct_item_ops = &comm_ops,
 368         .ct_attrs = comm_attrs,
 369         .ct_owner = THIS_MODULE,
 370 };
 371
 372 static struct config_item_type nodes_type = {
 373         .ct_group_ops = &nodes_ops,
 374         .ct_owner = THIS_MODULE,
 375 };
 376
 377 static struct config_item_type node_type = {
 378         .ct_item_ops = &node_ops,
 379         .ct_attrs = node_attrs,
 380         .ct_owner = THIS_MODULE,
 381 };
 382
 383 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
 384 {
 385         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
 386                    NULL;
 387 }
 388
 389 static struct dlm_space *config_item_to_space(struct config_item *i)
 390 {
 391         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 392                    NULL;
 393 }
 394
 395 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 396 {
 397         return i ? container_of(i, struct dlm_comm, item) : NULL;
 398 }
 399
 400 static struct dlm_node *config_item_to_node(struct config_item *i)
 401 {
 402         return i ? container_of(i, struct dlm_node, item) : NULL;
 403 }
 404
 405 static struct config_group *make_cluster(struct config_group *g,
 406                                          const char *name)
 407 {
 408         struct dlm_cluster *cl = NULL;
 409         struct dlm_spaces *sps = NULL;
 410         struct dlm_comms *cms = NULL;
 411         void *gps = NULL;
 412
 413         cl = kzalloc(sizeof(struct dlm_cluster), GFP_KERNEL);
 414         gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
 415         sps = kzalloc(sizeof(struct dlm_spaces), GFP_KERNEL);
 416         cms = kzalloc(sizeof(struct dlm_comms), GFP_KERNEL);
 417
 418         if (!cl || !gps || !sps || !cms)
 419                 goto fail;
 420
 421         config_group_init_type_name(&cl->group, name, &cluster_type);
 422         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 423         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 424
 425         cl->group.default_groups = gps;
 426         cl->group.default_groups[0] = &sps->ss_group;
 427         cl->group.default_groups[1] = &cms->cs_group;
 428         cl->group.default_groups[2] = NULL;
 429
 430         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 431         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 432         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 433         cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
 434         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
 435         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 436         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 437         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 438         cl->cl_log_debug = dlm_config.ci_log_debug;
 439         cl->cl_protocol = dlm_config.ci_protocol;
 440         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 441
 442         space_list = &sps->ss_group;
 443         comm_list = &cms->cs_group;
 444         return &cl->group;
 445
 446  fail:
 447         kfree(cl);
 448         kfree(gps);
 449         kfree(sps);
 450         kfree(cms);
 451         return ERR_PTR(-ENOMEM);
 452 }
 453
 454 static void drop_cluster(struct config_group *g, struct config_item *i)
 455 {
 456         struct dlm_cluster *cl = config_item_to_cluster(i);
 457         struct config_item *tmp;
 458         int j;
 459
 460         for (j = 0; cl->group.default_groups[j]; j++) {
 461                 tmp = &cl->group.default_groups[j]->cg_item;
 462                 cl->group.default_groups[j] = NULL;
 463                 config_item_put(tmp);
 464         }
 465
 466         space_list = NULL;
 467         comm_list = NULL;
 468
 469         config_item_put(i);
 470 }
 471
 472 static void release_cluster(struct config_item *i)
 473 {
 474         struct dlm_cluster *cl = config_item_to_cluster(i);
 475         kfree(cl->group.default_groups);
 476         kfree(cl);
 477 }
 478
 479 static struct config_group *make_space(struct config_group *g, const char *name)
 480 {
 481         struct dlm_space *sp = NULL;
 482         struct dlm_nodes *nds = NULL;
 483         void *gps = NULL;
 484
 485         sp = kzalloc(sizeof(struct dlm_space), GFP_KERNEL);
 486         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
 487         nds = kzalloc(sizeof(struct dlm_nodes), GFP_KERNEL);
 488
 489         if (!sp || !gps || !nds)
 490                 goto fail;
 491
 492         config_group_init_type_name(&sp->group, name, &space_type);
 493         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 494
 495         sp->group.default_groups = gps;
 496         sp->group.default_groups[0] = &nds->ns_group;
 497         sp->group.default_groups[1] = NULL;
 498
 499         INIT_LIST_HEAD(&sp->members);
 500         mutex_init(&sp->members_lock);
 501         sp->members_count = 0;
 502         return &sp->group;
 503
 504  fail:
 505         kfree(sp);
 506         kfree(gps);
 507         kfree(nds);
 508         return ERR_PTR(-ENOMEM);
 509 }
 510
 511 static void drop_space(struct config_group *g, struct config_item *i)
 512 {
 513         struct dlm_space *sp = config_item_to_space(i);
 514         struct config_item *tmp;
 515         int j;
 516
 517         /* assert list_empty(&sp->members) */
 518
 519         for (j = 0; sp->group.default_groups[j]; j++) {
 520                 tmp = &sp->group.default_groups[j]->cg_item;
 521                 sp->group.default_groups[j] = NULL;
 522                 config_item_put(tmp);
 523         }
 524
 525         config_item_put(i);
 526 }
 527
 528 static void release_space(struct config_item *i)
 529 {
 530         struct dlm_space *sp = config_item_to_space(i);
 531         kfree(sp->group.default_groups);
 532         kfree(sp);
 533 }
 534
 535 static struct config_item *make_comm(struct config_group *g, const char *name)
 536 {
 537         struct dlm_comm *cm;
 538
 539         cm = kzalloc(sizeof(struct dlm_comm), GFP_KERNEL);
 540         if (!cm)
 541                 return ERR_PTR(-ENOMEM);
 542
 543         config_item_init_type_name(&cm->item, name, &comm_type);
 544         cm->nodeid = -1;
 545         cm->local = 0;
 546         cm->addr_count = 0;
 547         return &cm->item;
 548 }
 549
 550 static void drop_comm(struct config_group *g, struct config_item *i)
 551 {
 552         struct dlm_comm *cm = config_item_to_comm(i);
 553         if (local_comm == cm)
 554                 local_comm = NULL;
 555         dlm_lowcomms_close(cm->nodeid);
 556         while (cm->addr_count--)
 557                 kfree(cm->addr[cm->addr_count]);
 558         config_item_put(i);
 559 }
 560
 561 static void release_comm(struct config_item *i)
 562 {
 563         struct dlm_comm *cm = config_item_to_comm(i);
 564         kfree(cm);
 565 }
 566
 567 static struct config_item *make_node(struct config_group *g, const char *name)
 568 {
 569         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 570         struct dlm_node *nd;
 571
 572         nd = kzalloc(sizeof(struct dlm_node), GFP_KERNEL);
 573         if (!nd)
 574                 return ERR_PTR(-ENOMEM);
 575
 576         config_item_init_type_name(&nd->item, name, &node_type);
 577         nd->nodeid = -1;
 578         nd->weight = 1;  /* default weight of 1 if none is set */
 579         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 580
 581         mutex_lock(&sp->members_lock);
 582         list_add(&nd->list, &sp->members);
 583         sp->members_count++;
 584         mutex_unlock(&sp->members_lock);
 585
 586         return &nd->item;
 587 }
 588
 589 static void drop_node(struct config_group *g, struct config_item *i)
 590 {
 591         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 592         struct dlm_node *nd = config_item_to_node(i);
 593
 594         mutex_lock(&sp->members_lock);
 595         list_del(&nd->list);
 596         sp->members_count--;
 597         mutex_unlock(&sp->members_lock);
 598
 599         config_item_put(i);
 600 }
 601
 602 static void release_node(struct config_item *i)
 603 {
 604         struct dlm_node *nd = config_item_to_node(i);
 605         kfree(nd);
 606 }
 607
 608 static struct dlm_clusters clusters_root = {
 609         .subsys = {
 610                 .su_group = {
 611                         .cg_item = {
 612                                 .ci_namebuf = "dlm",
 613                                 .ci_type = &clusters_type,
 614                         },
 615                 },
 616         },
 617 };
 618
 619 int __init dlm_config_init(void)
 620 {
 621         config_group_init(&clusters_root.subsys.su_group);
 622         mutex_init(&clusters_root.subsys.su_mutex);
 623         return configfs_register_subsystem(&clusters_root.subsys);
 624 }
 625
 626 void dlm_config_exit(void)
 627 {
 628         configfs_unregister_subsystem(&clusters_root.subsys);
 629 }
 630
 631 /*
 632  * Functions for user space to read/write attributes
 633  */
 634
 635 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 636                             char *buf)
 637 {
 638         struct dlm_cluster *cl = config_item_to_cluster(i);
 639         struct cluster_attribute *cla =
 640                         container_of(a, struct cluster_attribute, attr);
 641         return cla->show ? cla->show(cl, buf) : 0;
 642 }
 643
 644 static ssize_t store_cluster(struct config_item *i,
 645                              struct configfs_attribute *a,
 646                              const char *buf, size_t len)
 647 {
 648         struct dlm_cluster *cl = config_item_to_cluster(i);
 649         struct cluster_attribute *cla =
 650                 container_of(a, struct cluster_attribute, attr);
 651         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 652 }
 653
 654 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 655                          char *buf)
 656 {
 657         struct dlm_comm *cm = config_item_to_comm(i);
 658         struct comm_attribute *cma =
 659                         container_of(a, struct comm_attribute, attr);
 660         return cma->show ? cma->show(cm, buf) : 0;
 661 }
 662
 663 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 664                           const char *buf, size_t len)
 665 {
 666         struct dlm_comm *cm = config_item_to_comm(i);
 667         struct comm_attribute *cma =
 668                 container_of(a, struct comm_attribute, attr);
 669         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 670 }
 671
 672 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
 673 {
 674         return sprintf(buf, "%d\n", cm->nodeid);
 675 }
 676
 677 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
 678                                  size_t len)
 679 {
 680         cm->nodeid = simple_strtol(buf, NULL, 0);
 681         return len;
 682 }
 683
 684 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
 685 {
 686         return sprintf(buf, "%d\n", cm->local);
 687 }
 688
 689 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
 690                                 size_t len)
 691 {
 692         cm->local= simple_strtol(buf, NULL, 0);
 693         if (cm->local && !local_comm)
 694                 local_comm = cm;
 695         return len;
 696 }
 697
 698 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
 699 {
 700         struct sockaddr_storage *addr;
 701
 702         if (len != sizeof(struct sockaddr_storage))
 703                 return -EINVAL;
 704
 705         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 706                 return -ENOSPC;
 707
 708         addr = kzalloc(sizeof(*addr), GFP_KERNEL);
 709         if (!addr)
 710                 return -ENOMEM;
 711
 712         memcpy(addr, buf, len);
 713         cm->addr[cm->addr_count++] = addr;
 714         return len;
 715 }
 716
 717 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 718                          char *buf)
 719 {
 720         struct dlm_node *nd = config_item_to_node(i);
 721         struct node_attribute *nda =
 722                         container_of(a, struct node_attribute, attr);
 723         return nda->show ? nda->show(nd, buf) : 0;
 724 }
 725
 726 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 727                           const char *buf, size_t len)
 728 {
 729         struct dlm_node *nd = config_item_to_node(i);
 730         struct node_attribute *nda =
 731                 container_of(a, struct node_attribute, attr);
 732         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 733 }
 734
 735 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
 736 {
 737         return sprintf(buf, "%d\n", nd->nodeid);
 738 }
 739
 740 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
 741                                  size_t len)
 742 {
 743         nd->nodeid = simple_strtol(buf, NULL, 0);
 744         return len;
 745 }
 746
 747 static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
 748 {
 749         return sprintf(buf, "%d\n", nd->weight);
 750 }
 751
 752 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
 753                                  size_t len)
 754 {
 755         nd->weight = simple_strtol(buf, NULL, 0);
 756         return len;
 757 }
 758
 759 /*
 760  * Functions for the dlm to get the info that's been configured
 761  */
 762
 763 static struct dlm_space *get_space(char *name)
 764 {
 765         struct config_item *i;
 766
 767         if (!space_list)
 768                 return NULL;
 769
 770         mutex_lock(&space_list->cg_subsys->su_mutex);
 771         i = config_group_find_item(space_list, name);
 772         mutex_unlock(&space_list->cg_subsys->su_mutex);
 773
 774         return config_item_to_space(i);
 775 }
 776
 777 static void put_space(struct dlm_space *sp)
 778 {
 779         config_item_put(&sp->group.cg_item);
 780 }
 781
 782 static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
 783 {
 784         switch (x->ss_family) {
 785         case AF_INET: {
 786                 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
 787                 struct sockaddr_in *siny = (struct sockaddr_in *)y;
 788                 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
 789                         return 0;
 790                 if (sinx->sin_port != siny->sin_port)
 791                         return 0;
 792                 break;
 793         }
 794         case AF_INET6: {
 795                 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
 796                 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
 797                 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
 798                         return 0;
 799                 if (sinx->sin6_port != siny->sin6_port)
 800                         return 0;
 801                 break;
 802         }
 803         default:
 804                 return 0;
 805         }
 806         return 1;
 807 }
 808
 809 static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 810 {
 811         struct config_item *i;
 812         struct dlm_comm *cm = NULL;
 813         int found = 0;
 814
 815         if (!comm_list)
 816                 return NULL;
 817
 818         mutex_lock(&clusters_root.subsys.su_mutex);
 819
 820         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 821                 cm = config_item_to_comm(i);
 822
 823                 if (nodeid) {
 824                         if (cm->nodeid != nodeid)
 825                                 continue;
 826                         found = 1;
 827                         config_item_get(i);
 828                         break;
 829                 } else {
 830                         if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
 831                                 continue;
 832                         found = 1;
 833                         config_item_get(i);
 834                         break;
 835                 }
 836         }
 837         mutex_unlock(&clusters_root.subsys.su_mutex);
 838
 839         if (!found)
 840                 cm = NULL;
 841         return cm;
 842 }
 843
 844 static void put_comm(struct dlm_comm *cm)
 845 {
 846         config_item_put(&cm->item);
 847 }
 848
 849 /* caller must free mem */
 850 int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
 851                     int **new_out, int *new_count_out)
 852 {
 853         struct dlm_space *sp;
 854         struct dlm_node *nd;
 855         int i = 0, rv = 0, ids_count = 0, new_count = 0;
 856         int *ids, *new;
 857
 858         sp = get_space(lsname);
 859         if (!sp)
 860                 return -EEXIST;
 861
 862         mutex_lock(&sp->members_lock);
 863         if (!sp->members_count) {
 864                 rv = -EINVAL;
 865                 printk(KERN_ERR "dlm: zero members_count\n");
 866                 goto out;
 867         }
 868
 869         ids_count = sp->members_count;
 870
 871         ids = kcalloc(ids_count, sizeof(int), GFP_KERNEL);
 872         if (!ids) {
 873                 rv = -ENOMEM;
 874                 goto out;
 875         }
 876
 877         list_for_each_entry(nd, &sp->members, list) {
 878                 ids[i++] = nd->nodeid;
 879                 if (nd->new)
 880                         new_count++;
 881         }
 882
 883         if (ids_count != i)
 884                 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i);
 885
 886         if (!new_count)
 887                 goto out_ids;
 888
 889         new = kcalloc(new_count, sizeof(int), GFP_KERNEL);
 890         if (!new) {
 891                 kfree(ids);
 892                 rv = -ENOMEM;
 893                 goto out;
 894         }
 895
 896         i = 0;
 897         list_for_each_entry(nd, &sp->members, list) {
 898                 if (nd->new) {
 899                         new[i++] = nd->nodeid;
 900                         nd->new = 0;
 901                 }
 902         }
 903         *new_count_out = new_count;
 904         *new_out = new;
 905
 906  out_ids:
 907         *ids_count_out = ids_count;
 908         *ids_out = ids;
 909  out:
 910         mutex_unlock(&sp->members_lock);
 911         put_space(sp);
 912         return rv;
 913 }
 914
 915 int dlm_node_weight(char *lsname, int nodeid)
 916 {
 917         struct dlm_space *sp;
 918         struct dlm_node *nd;
 919         int w = -EEXIST;
 920
 921         sp = get_space(lsname);
 922         if (!sp)
 923                 goto out;
 924
 925         mutex_lock(&sp->members_lock);
 926         list_for_each_entry(nd, &sp->members, list) {
 927                 if (nd->nodeid != nodeid)
 928                         continue;
 929                 w = nd->weight;
 930                 break;
 931         }
 932         mutex_unlock(&sp->members_lock);
 933         put_space(sp);
 934  out:
 935         return w;
 936 }
 937
 938 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
 939 {
 940         struct dlm_comm *cm = get_comm(nodeid, NULL);
 941         if (!cm)
 942                 return -EEXIST;
 943         if (!cm->addr_count)
 944                 return -ENOENT;
 945         memcpy(addr, cm->addr[0], sizeof(*addr));
 946         put_comm(cm);
 947         return 0;
 948 }
 949
 950 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
 951 {
 952         struct dlm_comm *cm = get_comm(0, addr);
 953         if (!cm)
 954                 return -EEXIST;
 955         *nodeid = cm->nodeid;
 956         put_comm(cm);
 957         return 0;
 958 }
 959
 960 int dlm_our_nodeid(void)
 961 {
 962         return local_comm ? local_comm->nodeid : 0;
 963 }
 964
 965 /* num 0 is first addr, num 1 is second addr */
 966 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 967 {
 968         if (!local_comm)
 969                 return -1;
 970         if (num + 1 > local_comm->addr_count)
 971                 return -1;
 972         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 973         return 0;
 974 }
 975
 976 /* Config file defaults */
 977 #define DEFAULT_TCP_PORT       21064
 978 #define DEFAULT_BUFFER_SIZE     4096
 979 #define DEFAULT_RSBTBL_SIZE      256
 980 #define DEFAULT_LKBTBL_SIZE     1024
 981 #define DEFAULT_DIRTBL_SIZE      512
 982 #define DEFAULT_RECOVER_TIMER      5
 983 #define DEFAULT_TOSS_SECS         10
 984 #define DEFAULT_SCAN_SECS          5
 985 #define DEFAULT_LOG_DEBUG          0
 986 #define DEFAULT_PROTOCOL           0
 987 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 988
 989 struct dlm_config_info dlm_config = {
 990         .ci_tcp_port = DEFAULT_TCP_PORT,
 991         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 992         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 993         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
 994         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
 995         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 996         .ci_toss_secs = DEFAULT_TOSS_SECS,
 997         .ci_scan_secs = DEFAULT_SCAN_SECS,
 998         .ci_log_debug = DEFAULT_LOG_DEBUG,
 999         .ci_protocol = DEFAULT_PROTOCOL,
1000         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
1001 };
1002