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
 437         space_list = &sps->ss_group;
 438         comm_list = &cms->cs_group;
 439         return &cl->group;
 440
 441  fail:
 442         kfree(cl);
 443         kfree(gps);
 444         kfree(sps);
 445         kfree(cms);
 446         return NULL;
 447 }
 448
 449 static void drop_cluster(struct config_group *g, struct config_item *i)
 450 {
 451         struct cluster *cl = to_cluster(i);
 452         struct config_item *tmp;
 453         int j;
 454
 455         for (j = 0; cl->group.default_groups[j]; j++) {
 456                 tmp = &cl->group.default_groups[j]->cg_item;
 457                 cl->group.default_groups[j] = NULL;
 458                 config_item_put(tmp);
 459         }
 460
 461         space_list = NULL;
 462         comm_list = NULL;
 463
 464         config_item_put(i);
 465 }
 466
 467 static void release_cluster(struct config_item *i)
 468 {
 469         struct cluster *cl = to_cluster(i);
 470         kfree(cl->group.default_groups);
 471         kfree(cl);
 472 }
 473
 474 static struct config_group *make_space(struct config_group *g, const char *name)
 475 {
 476         struct space *sp = NULL;
 477         struct nodes *nds = NULL;
 478         void *gps = NULL;
 479
 480         sp = kzalloc(sizeof(struct space), GFP_KERNEL);
 481         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
 482         nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
 483
 484         if (!sp || !gps || !nds)
 485                 goto fail;
 486
 487         config_group_init_type_name(&sp->group, name, &space_type);
 488         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 489
 490         sp->group.default_groups = gps;
 491         sp->group.default_groups[0] = &nds->ns_group;
 492         sp->group.default_groups[1] = NULL;
 493
 494         INIT_LIST_HEAD(&sp->members);
 495         mutex_init(&sp->members_lock);
 496         sp->members_count = 0;
 497         return &sp->group;
 498
 499  fail:
 500         kfree(sp);
 501         kfree(gps);
 502         kfree(nds);
 503         return NULL;
 504 }
 505
 506 static void drop_space(struct config_group *g, struct config_item *i)
 507 {
 508         struct space *sp = to_space(i);
 509         struct config_item *tmp;
 510         int j;
 511
 512         /* assert list_empty(&sp->members) */
 513
 514         for (j = 0; sp->group.default_groups[j]; j++) {
 515                 tmp = &sp->group.default_groups[j]->cg_item;
 516                 sp->group.default_groups[j] = NULL;
 517                 config_item_put(tmp);
 518         }
 519
 520         config_item_put(i);
 521 }
 522
 523 static void release_space(struct config_item *i)
 524 {
 525         struct space *sp = to_space(i);
 526         kfree(sp->group.default_groups);
 527         kfree(sp);
 528 }
 529
 530 static struct config_item *make_comm(struct config_group *g, const char *name)
 531 {
 532         struct comm *cm;
 533
 534         cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
 535         if (!cm)
 536                 return NULL;
 537
 538         config_item_init_type_name(&cm->item, name, &comm_type);
 539         cm->nodeid = -1;
 540         cm->local = 0;
 541         cm->addr_count = 0;
 542         return &cm->item;
 543 }
 544
 545 static void drop_comm(struct config_group *g, struct config_item *i)
 546 {
 547         struct comm *cm = to_comm(i);
 548         if (local_comm == cm)
 549                 local_comm = NULL;
 550         dlm_lowcomms_close(cm->nodeid);
 551         while (cm->addr_count--)
 552                 kfree(cm->addr[cm->addr_count]);
 553         config_item_put(i);
 554 }
 555
 556 static void release_comm(struct config_item *i)
 557 {
 558         struct comm *cm = to_comm(i);
 559         kfree(cm);
 560 }
 561
 562 static struct config_item *make_node(struct config_group *g, const char *name)
 563 {
 564         struct space *sp = to_space(g->cg_item.ci_parent);
 565         struct node *nd;
 566
 567         nd = kzalloc(sizeof(struct node), GFP_KERNEL);
 568         if (!nd)
 569                 return NULL;
 570
 571         config_item_init_type_name(&nd->item, name, &node_type);
 572         nd->nodeid = -1;
 573         nd->weight = 1;  /* default weight of 1 if none is set */
 574
 575         mutex_lock(&sp->members_lock);
 576         list_add(&nd->list, &sp->members);
 577         sp->members_count++;
 578         mutex_unlock(&sp->members_lock);
 579
 580         return &nd->item;
 581 }
 582
 583 static void drop_node(struct config_group *g, struct config_item *i)
 584 {
 585         struct space *sp = to_space(g->cg_item.ci_parent);
 586         struct node *nd = to_node(i);
 587
 588         mutex_lock(&sp->members_lock);
 589         list_del(&nd->list);
 590         sp->members_count--;
 591         mutex_unlock(&sp->members_lock);
 592
 593         config_item_put(i);
 594 }
 595
 596 static void release_node(struct config_item *i)
 597 {
 598         struct node *nd = to_node(i);
 599         kfree(nd);
 600 }
 601
 602 static struct clusters clusters_root = {
 603         .subsys = {
 604                 .su_group = {
 605                         .cg_item = {
 606                                 .ci_namebuf = "dlm",
 607                                 .ci_type = &clusters_type,
 608                         },
 609                 },
 610         },
 611 };
 612
 613 int dlm_config_init(void)
 614 {
 615         config_group_init(&clusters_root.subsys.su_group);
 616         init_MUTEX(&clusters_root.subsys.su_sem);
 617         return configfs_register_subsystem(&clusters_root.subsys);
 618 }
 619
 620 void dlm_config_exit(void)
 621 {
 622         configfs_unregister_subsystem(&clusters_root.subsys);
 623 }
 624
 625 /*
 626  * Functions for user space to read/write attributes
 627  */
 628
 629 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 630                             char *buf)
 631 {
 632         struct cluster *cl = to_cluster(i);
 633         struct cluster_attribute *cla =
 634                         container_of(a, struct cluster_attribute, attr);
 635         return cla->show ? cla->show(cl, buf) : 0;
 636 }
 637
 638 static ssize_t store_cluster(struct config_item *i,
 639                              struct configfs_attribute *a,
 640                              const char *buf, size_t len)
 641 {
 642         struct cluster *cl = to_cluster(i);
 643         struct cluster_attribute *cla =
 644                 container_of(a, struct cluster_attribute, attr);
 645         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 646 }
 647
 648 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 649                          char *buf)
 650 {
 651         struct comm *cm = to_comm(i);
 652         struct comm_attribute *cma =
 653                         container_of(a, struct comm_attribute, attr);
 654         return cma->show ? cma->show(cm, buf) : 0;
 655 }
 656
 657 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 658                           const char *buf, size_t len)
 659 {
 660         struct comm *cm = to_comm(i);
 661         struct comm_attribute *cma =
 662                 container_of(a, struct comm_attribute, attr);
 663         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 664 }
 665
 666 static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
 667 {
 668         return sprintf(buf, "%d\n", cm->nodeid);
 669 }
 670
 671 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len)
 672 {
 673         cm->nodeid = simple_strtol(buf, NULL, 0);
 674         return len;
 675 }
 676
 677 static ssize_t comm_local_read(struct comm *cm, char *buf)
 678 {
 679         return sprintf(buf, "%d\n", cm->local);
 680 }
 681
 682 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
 683 {
 684         cm->local= simple_strtol(buf, NULL, 0);
 685         if (cm->local && !local_comm)
 686                 local_comm = cm;
 687         return len;
 688 }
 689
 690 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
 691 {
 692         struct sockaddr_storage *addr;
 693
 694         if (len != sizeof(struct sockaddr_storage))
 695                 return -EINVAL;
 696
 697         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 698                 return -ENOSPC;
 699
 700         addr = kzalloc(sizeof(*addr), GFP_KERNEL);
 701         if (!addr)
 702                 return -ENOMEM;
 703
 704         memcpy(addr, buf, len);
 705         cm->addr[cm->addr_count++] = addr;
 706         return len;
 707 }
 708
 709 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 710                          char *buf)
 711 {
 712         struct node *nd = to_node(i);
 713         struct node_attribute *nda =
 714                         container_of(a, struct node_attribute, attr);
 715         return nda->show ? nda->show(nd, buf) : 0;
 716 }
 717
 718 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 719                           const char *buf, size_t len)
 720 {
 721         struct node *nd = to_node(i);
 722         struct node_attribute *nda =
 723                 container_of(a, struct node_attribute, attr);
 724         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 725 }
 726
 727 static ssize_t node_nodeid_read(struct node *nd, char *buf)
 728 {
 729         return sprintf(buf, "%d\n", nd->nodeid);
 730 }
 731
 732 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
 733 {
 734         nd->nodeid = simple_strtol(buf, NULL, 0);
 735         return len;
 736 }
 737
 738 static ssize_t node_weight_read(struct node *nd, char *buf)
 739 {
 740         return sprintf(buf, "%d\n", nd->weight);
 741 }
 742
 743 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
 744 {
 745         nd->weight = simple_strtol(buf, NULL, 0);
 746         return len;
 747 }
 748
 749 /*
 750  * Functions for the dlm to get the info that's been configured
 751  */
 752
 753 static struct space *get_space(char *name)
 754 {
 755         struct config_item *i;
 756
 757         if (!space_list)
 758                 return NULL;
 759
 760         down(&space_list->cg_subsys->su_sem);
 761         i = config_group_find_obj(space_list, name);
 762         up(&space_list->cg_subsys->su_sem);
 763
 764         return to_space(i);
 765 }
 766
 767 static void put_space(struct space *sp)
 768 {
 769         config_item_put(&sp->group.cg_item);
 770 }
 771
 772 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 773 {
 774         struct config_item *i;
 775         struct comm *cm = NULL;
 776         int found = 0;
 777
 778         if (!comm_list)
 779                 return NULL;
 780
 781         down(&clusters_root.subsys.su_sem);
 782
 783         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 784                 cm = to_comm(i);
 785
 786                 if (nodeid) {
 787                         if (cm->nodeid != nodeid)
 788                                 continue;
 789                         found = 1;
 790                         config_item_get(i);
 791                         break;
 792                 } else {
 793                         if (!cm->addr_count ||
 794                             memcmp(cm->addr[0], addr, sizeof(*addr)))
 795                                 continue;
 796                         found = 1;
 797                         config_item_get(i);
 798                         break;
 799                 }
 800         }
 801         up(&clusters_root.subsys.su_sem);
 802
 803         if (!found)
 804                 cm = NULL;
 805         return cm;
 806 }
 807
 808 static void put_comm(struct comm *cm)
 809 {
 810         config_item_put(&cm->item);
 811 }
 812
 813 /* caller must free mem */
 814 int dlm_nodeid_list(char *lsname, int **ids_out)
 815 {
 816         struct space *sp;
 817         struct node *nd;
 818         int i = 0, rv = 0;
 819         int *ids;
 820
 821         sp = get_space(lsname);
 822         if (!sp)
 823                 return -EEXIST;
 824
 825         mutex_lock(&sp->members_lock);
 826         if (!sp->members_count) {
 827                 rv = 0;
 828                 goto out;
 829         }
 830
 831         ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL);
 832         if (!ids) {
 833                 rv = -ENOMEM;
 834                 goto out;
 835         }
 836
 837         rv = sp->members_count;
 838         list_for_each_entry(nd, &sp->members, list)
 839                 ids[i++] = nd->nodeid;
 840
 841         if (rv != i)
 842                 printk("bad nodeid count %d %d\n", rv, i);
 843
 844         *ids_out = ids;
 845  out:
 846         mutex_unlock(&sp->members_lock);
 847         put_space(sp);
 848         return rv;
 849 }
 850
 851 int dlm_node_weight(char *lsname, int nodeid)
 852 {
 853         struct space *sp;
 854         struct node *nd;
 855         int w = -EEXIST;
 856
 857         sp = get_space(lsname);
 858         if (!sp)
 859                 goto out;
 860
 861         mutex_lock(&sp->members_lock);
 862         list_for_each_entry(nd, &sp->members, list) {
 863                 if (nd->nodeid != nodeid)
 864                         continue;
 865                 w = nd->weight;
 866                 break;
 867         }
 868         mutex_unlock(&sp->members_lock);
 869         put_space(sp);
 870  out:
 871         return w;
 872 }
 873
 874 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
 875 {
 876         struct comm *cm = get_comm(nodeid, NULL);
 877         if (!cm)
 878                 return -EEXIST;
 879         if (!cm->addr_count)
 880                 return -ENOENT;
 881         memcpy(addr, cm->addr[0], sizeof(*addr));
 882         put_comm(cm);
 883         return 0;
 884 }
 885
 886 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
 887 {
 888         struct comm *cm = get_comm(0, addr);
 889         if (!cm)
 890                 return -EEXIST;
 891         *nodeid = cm->nodeid;
 892         put_comm(cm);
 893         return 0;
 894 }
 895
 896 int dlm_our_nodeid(void)
 897 {
 898         return local_comm ? local_comm->nodeid : 0;
 899 }
 900
 901 /* num 0 is first addr, num 1 is second addr */
 902 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 903 {
 904         if (!local_comm)
 905                 return -1;
 906         if (num + 1 > local_comm->addr_count)
 907                 return -1;
 908         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 909         return 0;
 910 }
 911
 912 /* Config file defaults */
 913 #define DEFAULT_TCP_PORT       21064
 914 #define DEFAULT_BUFFER_SIZE     4096
 915 #define DEFAULT_RSBTBL_SIZE      256
 916 #define DEFAULT_LKBTBL_SIZE     1024
 917 #define DEFAULT_DIRTBL_SIZE      512
 918 #define DEFAULT_RECOVER_TIMER      5
 919 #define DEFAULT_TOSS_SECS         10
 920 #define DEFAULT_SCAN_SECS          5
 921 #define DEFAULT_LOG_DEBUG          0
 922 #define DEFAULT_PROTOCOL           0
 923 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 924
 925 struct dlm_config_info dlm_config = {
 926         .ci_tcp_port = DEFAULT_TCP_PORT,
 927         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 928         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 929         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
 930         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
 931         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 932         .ci_toss_secs = DEFAULT_TOSS_SECS,
 933         .ci_scan_secs = DEFAULT_SCAN_SECS,
 934         .ci_log_debug = DEFAULT_LOG_DEBUG,
 935         .ci_protocol = DEFAULT_PROTOCOL,
 936         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
 937 };
 938