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