SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/dlm/config.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2007 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 <net/sock.h>
  18
  19 #include "config.h"
  20 #include "lowcomms.h"
  21
  22 /*
  23  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  24  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  25  * /config/dlm/<cluster>/comms/<comm>/nodeid
  26  * /config/dlm/<cluster>/comms/<comm>/local
  27  * /config/dlm/<cluster>/comms/<comm>/addr
  28  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  29  */
  30
  31 static struct config_group *space_list;
  32 static struct config_group *comm_list;
  33 static struct comm *local_comm;
  34
  35 struct clusters;
  36 struct cluster;
  37 struct spaces;
  38 struct space;
  39 struct comms;
  40 struct comm;
  41 struct nodes;
  42 struct node;
  43
  44 static struct config_group *make_cluster(struct config_group *, const char *);
  45 static void drop_cluster(struct config_group *, struct config_item *);
  46 static void release_cluster(struct config_item *);
  47 static struct config_group *make_space(struct config_group *, const char *);
  48 static void drop_space(struct config_group *, struct config_item *);
  49 static void release_space(struct config_item *);
  50 static struct config_item *make_comm(struct config_group *, const char *);
  51 static void drop_comm(struct config_group *, struct config_item *);
  52 static void release_comm(struct config_item *);
  53 static struct config_item *make_node(struct config_group *, const char *);
  54 static void drop_node(struct config_group *, struct config_item *);
  55 static void release_node(struct config_item *);
  56
  57 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
  58                             char *buf);
  59 static ssize_t store_cluster(struct config_item *i,
  60                              struct configfs_attribute *a,
  61                              const char *buf, size_t len);
  62 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
  63                          char *buf);
  64 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
  65                           const char *buf, size_t len);
  66 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
  67                          char *buf);
  68 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
  69                           const char *buf, size_t len);
  70
  71 static ssize_t comm_nodeid_read(struct comm *cm, char *buf);
  72 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len);
  73 static ssize_t comm_local_read(struct comm *cm, char *buf);
  74 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len);
  75 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len);
  76 static ssize_t node_nodeid_read(struct node *nd, char *buf);
  77 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len);
  78 static ssize_t node_weight_read(struct node *nd, char *buf);
  79 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len);
  80
  81 struct cluster {
  82         struct config_group group;
  83         unsigned int cl_tcp_port;
  84         unsigned int cl_buffer_size;
  85         unsigned int cl_rsbtbl_size;
  86         unsigned int cl_lkbtbl_size;
  87         unsigned int cl_dirtbl_size;
  88         unsigned int cl_recover_timer;
  89         unsigned int cl_toss_secs;
  90         unsigned int cl_scan_secs;
  91         unsigned int cl_log_debug;
  92         unsigned int cl_protocol;
  93         unsigned int cl_timewarn_cs;
  94 };
  95
  96 enum {
  97         CLUSTER_ATTR_TCP_PORT = 0,
  98         CLUSTER_ATTR_BUFFER_SIZE,
  99         CLUSTER_ATTR_RSBTBL_SIZE,
 100         CLUSTER_ATTR_LKBTBL_SIZE,
 101         CLUSTER_ATTR_DIRTBL_SIZE,
 102         CLUSTER_ATTR_RECOVER_TIMER,
 103         CLUSTER_ATTR_TOSS_SECS,
 104         CLUSTER_ATTR_SCAN_SECS,
 105         CLUSTER_ATTR_LOG_DEBUG,
 106         CLUSTER_ATTR_PROTOCOL,
 107         CLUSTER_ATTR_TIMEWARN_CS,
 108 };
 109
 110 struct cluster_attribute {
 111         struct configfs_attribute attr;
 112         ssize_t (*show)(struct cluster *, char *);
 113         ssize_t (*store)(struct cluster *, const char *, size_t);
 114 };
 115
 116 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
 117                            unsigned int *info_field, int check_zero,
 118                            const char *buf, size_t len)
 119 {
 120         unsigned int x;
 121
 122         if (!capable(CAP_SYS_ADMIN))
 123                 return -EACCES;
 124
 125         x = simple_strtoul(buf, NULL, 0);
 126
 127         if (check_zero && !x)
 128                 return -EINVAL;
 129
 130         *cl_field = x;
 131         *info_field = x;
 132
 133         return len;
 134 }
 135
 136 #define __CONFIGFS_ATTR(_name,_mode,_read,_write) {                           \
 137         .attr   = { .ca_name = __stringify(_name),                            \
 138                     .ca_mode = _mode,                                         \
 139                     .ca_owner = THIS_MODULE },                                \
 140         .show   = _read,                                                      \
 141         .store  = _write,                                                     \
 142 }
 143
 144 #define CLUSTER_ATTR(name, check_zero)                                        \
 145 static ssize_t name##_write(struct 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 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 comm *, char *);
 193         ssize_t (*store)(struct 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 node *, char *);
 234         ssize_t (*store)(struct 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 clusters {
 260         struct configfs_subsystem subsys;
 261 };
 262
 263 struct spaces {
 264         struct config_group ss_group;
 265 };
 266
 267 struct space {
 268         struct config_group group;
 269         struct list_head members;
 270         struct mutex members_lock;
 271         int members_count;
 272 };
 273
 274 struct comms {
 275         struct config_group cs_group;
 276 };
 277
 278 struct 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 nodes {
 287         struct config_group ns_group;
 288 };
 289
 290 struct node {
 291         struct config_item item;
 292         struct list_head list; /* space->members */
 293         int nodeid;
 294         int weight;
 295 };
 296
 297 static struct configfs_group_operations clusters_ops = {
 298         .make_group = make_cluster,
 299         .drop_item = drop_cluster,
 300 };
 301
 302 static struct configfs_item_operations cluster_ops = {
 303         .release = release_cluster,
 304         .show_attribute = show_cluster,
 305         .store_attribute = store_cluster,
 306 };
 307
 308 static struct configfs_group_operations spaces_ops = {
 309         .make_group = make_space,
 310         .drop_item = drop_space,
 311 };
 312
 313 static struct configfs_item_operations space_ops = {
 314         .release = release_space,
 315 };
 316
 317 static struct configfs_group_operations comms_ops = {
 318         .make_item = make_comm,
 319         .drop_item = drop_comm,
 320 };
 321
 322 static struct configfs_item_operations comm_ops = {
 323         .release = release_comm,
 324         .show_attribute = show_comm,
 325         .store_attribute = store_comm,
 326 };
 327
 328 static struct configfs_group_operations nodes_ops = {
 329         .make_item = make_node,
 330         .drop_item = drop_node,
 331 };
 332
 333 static struct configfs_item_operations node_ops = {
 334         .release = release_node,
 335         .show_attribute = show_node,
 336         .store_attribute = store_node,
 337 };
 338
 339 static struct config_item_type clusters_type = {
 340         .ct_group_ops = &clusters_ops,
 341         .ct_owner = THIS_MODULE,
 342 };
 343
 344 static struct config_item_type cluster_type = {
 345         .ct_item_ops = &cluster_ops,
 346         .ct_attrs = cluster_attrs,
 347         .ct_owner = THIS_MODULE,
 348 };
 349
 350 static struct config_item_type spaces_type = {
 351         .ct_group_ops = &spaces_ops,
 352         .ct_owner = THIS_MODULE,
 353 };
 354
 355 static struct config_item_type space_type = {
 356         .ct_item_ops = &space_ops,
 357         .ct_owner = THIS_MODULE,
 358 };
 359
 360 static struct config_item_type comms_type = {
 361         .ct_group_ops = &comms_ops,
 362         .ct_owner = THIS_MODULE,
 363 };
 364
 365 static struct config_item_type comm_type = {
 366         .ct_item_ops = &comm_ops,
 367         .ct_attrs = comm_attrs,
 368         .ct_owner = THIS_MODULE,
 369 };
 370
 371 static struct config_item_type nodes_type = {
 372         .ct_group_ops = &nodes_ops,
 373         .ct_owner = THIS_MODULE,
 374 };
 375
 376 static struct config_item_type node_type = {
 377         .ct_item_ops = &node_ops,
 378         .ct_attrs = node_attrs,
 379         .ct_owner = THIS_MODULE,
 380 };
 381
 382 static struct cluster *to_cluster(struct config_item *i)
 383 {
 384         return i ? container_of(to_config_group(i), struct cluster, group):NULL;
 385 }
 386
 387 static struct space *to_space(struct config_item *i)
 388 {
 389         return i ? container_of(to_config_group(i), struct space, group) : NULL;
 390 }
 391
 392 static struct comm *to_comm(struct config_item *i)
 393 {
 394         return i ? container_of(i, struct comm, item) : NULL;
 395 }
 396
 397 static struct node *to_node(struct config_item *i)
 398 {
 399         return i ? container_of(i, struct node, item) : NULL;
 400 }
 401
 402 static struct config_group *make_cluster(struct config_group *g,
 403                                          const char *name)
 404 {
 405         struct cluster *cl = NULL;
 406         struct spaces *sps = NULL;
 407         struct comms *cms = NULL;
 408         void *gps = NULL;
 409
 410         cl = kzalloc(sizeof(struct cluster), GFP_KERNEL);
 411         gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
 412         sps = kzalloc(sizeof(struct spaces), GFP_KERNEL);
 413         cms = kzalloc(sizeof(struct comms), GFP_KERNEL);
 414
 415         if (!cl || !gps || !sps || !cms)
 416                 goto fail;
 417
 418         config_group_init_type_name(&cl->group, name, &cluster_type);
 419         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 420         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 421
 422         cl->group.default_groups = gps;
 423         cl->group.default_groups[0] = &sps->ss_group;
 424         cl->group.default_groups[1] = &cms->cs_group;
 425         cl->group.default_groups[2] = NULL;
 426
 427         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 428         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 429         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 430         cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
 431         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
 432         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 433         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 434         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 435         cl->cl_log_debug = dlm_config.ci_log_debug;
 436         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 437
 438         space_list = &sps->ss_group;
 439         comm_list = &cms->cs_group;
 440         return &cl->group;
 441
 442  fail:
 443         kfree(cl);
 444         kfree(gps);
 445         kfree(sps);
 446         kfree(cms);
 447         return NULL;
 448 }
 449
 450 static void drop_cluster(struct config_group *g, struct config_item *i)
 451 {
 452         struct cluster *cl = to_cluster(i);
 453         struct config_item *tmp;
 454         int j;
 455
 456         for (j = 0; cl->group.default_groups[j]; j++) {
 457                 tmp = &cl->group.default_groups[j]->cg_item;
 458                 cl->group.default_groups[j] = NULL;
 459                 config_item_put(tmp);
 460         }
 461
 462         space_list = NULL;
 463         comm_list = NULL;
 464
 465         config_item_put(i);
 466 }
 467
 468 static void release_cluster(struct config_item *i)
 469 {
 470         struct cluster *cl = to_cluster(i);
 471         kfree(cl->group.default_groups);
 472         kfree(cl);
 473 }
 474
 475 static struct config_group *make_space(struct config_group *g, const char *name)
 476 {
 477         struct space *sp = NULL;
 478         struct nodes *nds = NULL;
 479         void *gps = NULL;
 480
 481         sp = kzalloc(sizeof(struct space), GFP_KERNEL);
 482         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
 483         nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
 484
 485         if (!sp || !gps || !nds)
 486                 goto fail;
 487
 488         config_group_init_type_name(&sp->group, name, &space_type);
 489         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 490
 491         sp->group.default_groups = gps;
 492         sp->group.default_groups[0] = &nds->ns_group;
 493         sp->group.default_groups[1] = NULL;
 494
 495         INIT_LIST_HEAD(&sp->members);
 496         mutex_init(&sp->members_lock);
 497         sp->members_count = 0;
 498         return &sp->group;
 499
 500  fail:
 501         kfree(sp);
 502         kfree(gps);
 503         kfree(nds);
 504         return NULL;
 505 }
 506
 507 static void drop_space(struct config_group *g, struct config_item *i)
 508 {
 509         struct space *sp = to_space(i);
 510         struct config_item *tmp;
 511         int j;
 512
 513         /* assert list_empty(&sp->members) */
 514
 515         for (j = 0; sp->group.default_groups[j]; j++) {
 516                 tmp = &sp->group.default_groups[j]->cg_item;
 517                 sp->group.default_groups[j] = NULL;
 518                 config_item_put(tmp);
 519         }
 520
 521         config_item_put(i);
 522 }
 523
 524 static void release_space(struct config_item *i)
 525 {
 526         struct space *sp = to_space(i);
 527         kfree(sp->group.default_groups);
 528         kfree(sp);
 529 }
 530
 531 static struct config_item *make_comm(struct config_group *g, const char *name)
 532 {
 533         struct comm *cm;
 534
 535         cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
 536         if (!cm)
 537                 return NULL;
 538
 539         config_item_init_type_name(&cm->item, name, &comm_type);
 540         cm->nodeid = -1;
 541         cm->local = 0;
 542         cm->addr_count = 0;
 543         return &cm->item;
 544 }
 545
 546 static void drop_comm(struct config_group *g, struct config_item *i)
 547 {
 548         struct comm *cm = to_comm(i);
 549         if (local_comm == cm)
 550                 local_comm = NULL;
 551         dlm_lowcomms_close(cm->nodeid);
 552         while (cm->addr_count--)
 553                 kfree(cm->addr[cm->addr_count]);
 554         config_item_put(i);
 555 }
 556
 557 static void release_comm(struct config_item *i)
 558 {
 559         struct comm *cm = to_comm(i);
 560         kfree(cm);
 561 }
 562
 563 static struct config_item *make_node(struct config_group *g, const char *name)
 564 {
 565         struct space *sp = to_space(g->cg_item.ci_parent);
 566         struct node *nd;
 567
 568         nd = kzalloc(sizeof(struct node), GFP_KERNEL);
 569         if (!nd)
 570                 return NULL;
 571
 572         config_item_init_type_name(&nd->item, name, &node_type);
 573         nd->nodeid = -1;
 574         nd->weight = 1;  /* default weight of 1 if none is set */
 575
 576         mutex_lock(&sp->members_lock);
 577         list_add(&nd->list, &sp->members);
 578         sp->members_count++;
 579         mutex_unlock(&sp->members_lock);
 580
 581         return &nd->item;
 582 }
 583
 584 static void drop_node(struct config_group *g, struct config_item *i)
 585 {
 586         struct space *sp = to_space(g->cg_item.ci_parent);
 587         struct node *nd = to_node(i);
 588
 589         mutex_lock(&sp->members_lock);
 590         list_del(&nd->list);
 591         sp->members_count--;
 592         mutex_unlock(&sp->members_lock);
 593
 594         config_item_put(i);
 595 }
 596
 597 static void release_node(struct config_item *i)
 598 {
 599         struct node *nd = to_node(i);
 600         kfree(nd);
 601 }
 602
 603 static struct clusters clusters_root = {
 604         .subsys = {
 605                 .su_group = {
 606                         .cg_item = {
 607                                 .ci_namebuf = "dlm",
 608                                 .ci_type = &clusters_type,
 609                         },
 610                 },
 611         },
 612 };
 613
 614 int dlm_config_init(void)
 615 {
 616         config_group_init(&clusters_root.subsys.su_group);
 617         init_MUTEX(&clusters_root.subsys.su_sem);
 618         return configfs_register_subsystem(&clusters_root.subsys);
 619 }
 620
 621 void dlm_config_exit(void)
 622 {
 623         configfs_unregister_subsystem(&clusters_root.subsys);
 624 }
 625
 626 /*
 627  * Functions for user space to read/write attributes
 628  */
 629
 630 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 631                             char *buf)
 632 {
 633         struct cluster *cl = to_cluster(i);
 634         struct cluster_attribute *cla =
 635                         container_of(a, struct cluster_attribute, attr);
 636         return cla->show ? cla->show(cl, buf) : 0;
 637 }
 638
 639 static ssize_t store_cluster(struct config_item *i,
 640                              struct configfs_attribute *a,
 641                              const char *buf, size_t len)
 642 {
 643         struct cluster *cl = to_cluster(i);
 644         struct cluster_attribute *cla =
 645                 container_of(a, struct cluster_attribute, attr);
 646         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 647 }
 648
 649 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 650                          char *buf)
 651 {
 652         struct comm *cm = to_comm(i);
 653         struct comm_attribute *cma =
 654                         container_of(a, struct comm_attribute, attr);
 655         return cma->show ? cma->show(cm, buf) : 0;
 656 }
 657
 658 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 659                           const char *buf, size_t len)
 660 {
 661         struct comm *cm = to_comm(i);
 662         struct comm_attribute *cma =
 663                 container_of(a, struct comm_attribute, attr);
 664         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 665 }
 666
 667 static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
 668 {
 669         return sprintf(buf, "%d\n", cm->nodeid);
 670 }
 671
 672 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len)
 673 {
 674         cm->nodeid = simple_strtol(buf, NULL, 0);
 675         return len;
 676 }
 677
 678 static ssize_t comm_local_read(struct comm *cm, char *buf)
 679 {
 680         return sprintf(buf, "%d\n", cm->local);
 681 }
 682
 683 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
 684 {
 685         cm->local= simple_strtol(buf, NULL, 0);
 686         if (cm->local && !local_comm)
 687                 local_comm = cm;
 688         return len;
 689 }
 690
 691 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
 692 {
 693         struct sockaddr_storage *addr;
 694
 695         if (len != sizeof(struct sockaddr_storage))
 696                 return -EINVAL;
 697
 698         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 699                 return -ENOSPC;
 700
 701         addr = kzalloc(sizeof(*addr), GFP_KERNEL);
 702         if (!addr)
 703                 return -ENOMEM;
 704
 705         memcpy(addr, buf, len);
 706         cm->addr[cm->addr_count++] = addr;
 707         return len;
 708 }
 709
 710 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 711                          char *buf)
 712 {
 713         struct node *nd = to_node(i);
 714         struct node_attribute *nda =
 715                         container_of(a, struct node_attribute, attr);
 716         return nda->show ? nda->show(nd, buf) : 0;
 717 }
 718
 719 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 720                           const char *buf, size_t len)
 721 {
 722         struct node *nd = to_node(i);
 723         struct node_attribute *nda =
 724                 container_of(a, struct node_attribute, attr);
 725         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 726 }
 727
 728 static ssize_t node_nodeid_read(struct node *nd, char *buf)
 729 {
 730         return sprintf(buf, "%d\n", nd->nodeid);
 731 }
 732
 733 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
 734 {
 735         nd->nodeid = simple_strtol(buf, NULL, 0);
 736         return len;
 737 }
 738
 739 static ssize_t node_weight_read(struct node *nd, char *buf)
 740 {
 741         return sprintf(buf, "%d\n", nd->weight);
 742 }
 743
 744 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
 745 {
 746         nd->weight = simple_strtol(buf, NULL, 0);
 747         return len;
 748 }
 749
 750 /*
 751  * Functions for the dlm to get the info that's been configured
 752  */
 753
 754 static struct space *get_space(char *name)
 755 {
 756         struct config_item *i;
 757
 758         if (!space_list)
 759                 return NULL;
 760
 761         down(&space_list->cg_subsys->su_sem);
 762         i = config_group_find_obj(space_list, name);
 763         up(&space_list->cg_subsys->su_sem);
 764
 765         return to_space(i);
 766 }
 767
 768 static void put_space(struct space *sp)
 769 {
 770         config_item_put(&sp->group.cg_item);
 771 }
 772
 773 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 774 {
 775         struct config_item *i;
 776         struct comm *cm = NULL;
 777         int found = 0;
 778
 779         if (!comm_list)
 780                 return NULL;
 781
 782         down(&clusters_root.subsys.su_sem);
 783
 784         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 785                 cm = to_comm(i);
 786
 787                 if (nodeid) {
 788                         if (cm->nodeid != nodeid)
 789                                 continue;
 790                         found = 1;
 791                         config_item_get(i);
 792                         break;
 793                 } else {
 794                         if (!cm->addr_count ||
 795                             memcmp(cm->addr[0], addr, sizeof(*addr)))
 796                                 continue;
 797                         found = 1;
 798                         config_item_get(i);
 799                         break;
 800                 }
 801         }
 802         up(&clusters_root.subsys.su_sem);
 803
 804         if (!found)
 805                 cm = NULL;
 806         return cm;
 807 }
 808
 809 static void put_comm(struct comm *cm)
 810 {
 811         config_item_put(&cm->item);
 812 }
 813
 814 /* caller must free mem */
 815 int dlm_nodeid_list(char *lsname, int **ids_out)
 816 {
 817         struct space *sp;
 818         struct node *nd;
 819         int i = 0, rv = 0;
 820         int *ids;
 821
 822         sp = get_space(lsname);
 823         if (!sp)
 824                 return -EEXIST;
 825
 826         mutex_lock(&sp->members_lock);
 827         if (!sp->members_count) {
 828                 rv = 0;
 829                 goto out;
 830         }
 831
 832         ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL);
 833         if (!ids) {
 834                 rv = -ENOMEM;
 835                 goto out;
 836         }
 837
 838         rv = sp->members_count;
 839         list_for_each_entry(nd, &sp->members, list)
 840                 ids[i++] = nd->nodeid;
 841
 842         if (rv != i)
 843                 printk("bad nodeid count %d %d\n", rv, i);
 844
 845         *ids_out = ids;
 846  out:
 847         mutex_unlock(&sp->members_lock);
 848         put_space(sp);
 849         return rv;
 850 }
 851
 852 int dlm_node_weight(char *lsname, int nodeid)
 853 {
 854         struct space *sp;
 855         struct node *nd;
 856         int w = -EEXIST;
 857
 858         sp = get_space(lsname);
 859         if (!sp)
 860                 goto out;
 861
 862         mutex_lock(&sp->members_lock);
 863         list_for_each_entry(nd, &sp->members, list) {
 864                 if (nd->nodeid != nodeid)
 865                         continue;
 866                 w = nd->weight;
 867                 break;
 868         }
 869         mutex_unlock(&sp->members_lock);
 870         put_space(sp);
 871  out:
 872         return w;
 873 }
 874
 875 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
 876 {
 877         struct comm *cm = get_comm(nodeid, NULL);
 878         if (!cm)
 879                 return -EEXIST;
 880         if (!cm->addr_count)
 881                 return -ENOENT;
 882         memcpy(addr, cm->addr[0], sizeof(*addr));
 883         put_comm(cm);
 884         return 0;
 885 }
 886
 887 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
 888 {
 889         struct comm *cm = get_comm(0, addr);
 890         if (!cm)
 891                 return -EEXIST;
 892         *nodeid = cm->nodeid;
 893         put_comm(cm);
 894         return 0;
 895 }
 896
 897 int dlm_our_nodeid(void)
 898 {
 899         return local_comm ? local_comm->nodeid : 0;
 900 }
 901
 902 /* num 0 is first addr, num 1 is second addr */
 903 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 904 {
 905         if (!local_comm)
 906                 return -1;
 907         if (num + 1 > local_comm->addr_count)
 908                 return -1;
 909         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 910         return 0;
 911 }
 912
 913 /* Config file defaults */
 914 #define DEFAULT_TCP_PORT       21064
 915 #define DEFAULT_BUFFER_SIZE     4096
 916 #define DEFAULT_RSBTBL_SIZE      256
 917 #define DEFAULT_LKBTBL_SIZE     1024
 918 #define DEFAULT_DIRTBL_SIZE      512
 919 #define DEFAULT_RECOVER_TIMER      5
 920 #define DEFAULT_TOSS_SECS         10
 921 #define DEFAULT_SCAN_SECS          5
 922 #define DEFAULT_LOG_DEBUG          0
 923 #define DEFAULT_PROTOCOL           0
 924 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 925
 926 struct dlm_config_info dlm_config = {
 927         .ci_tcp_port = DEFAULT_TCP_PORT,
 928         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 929         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 930         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
 931         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
 932         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 933         .ci_toss_secs = DEFAULT_TOSS_SECS,
 934         .ci_scan_secs = DEFAULT_SCAN_SECS,
 935         .ci_log_debug = DEFAULT_LOG_DEBUG,
 936         .ci_protocol = DEFAULT_PROTOCOL,
 937         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
 938 };
 939