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