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 };
  94
  95 enum {
  96         CLUSTER_ATTR_TCP_PORT = 0,
  97         CLUSTER_ATTR_BUFFER_SIZE,
  98         CLUSTER_ATTR_RSBTBL_SIZE,
  99         CLUSTER_ATTR_LKBTBL_SIZE,
 100         CLUSTER_ATTR_DIRTBL_SIZE,
 101         CLUSTER_ATTR_RECOVER_TIMER,
 102         CLUSTER_ATTR_TOSS_SECS,
 103         CLUSTER_ATTR_SCAN_SECS,
 104         CLUSTER_ATTR_LOG_DEBUG,
 105         CLUSTER_ATTR_PROTOCOL,
 106 };
 107
 108 struct cluster_attribute {
 109         struct configfs_attribute attr;
 110         ssize_t (*show)(struct cluster *, char *);
 111         ssize_t (*store)(struct cluster *, const char *, size_t);
 112 };
 113
 114 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
 115                            unsigned int *info_field, int check_zero,
 116                            const char *buf, size_t len)
 117 {
 118         unsigned int x;
 119
 120         if (!capable(CAP_SYS_ADMIN))
 121                 return -EACCES;
 122
 123         x = simple_strtoul(buf, NULL, 0);
 124
 125         if (check_zero && !x)
 126                 return -EINVAL;
 127
 128         *cl_field = x;
 129         *info_field = x;
 130
 131         return len;
 132 }
 133
 134 #define __CONFIGFS_ATTR(_name,_mode,_read,_write) {                           \
 135         .attr   = { .ca_name = __stringify(_name),                            \
 136                     .ca_mode = _mode,                                         \
 137                     .ca_owner = THIS_MODULE },                                \
 138         .show   = _read,                                                      \
 139         .store  = _write,                                                     \
 140 }
 141
 142 #define CLUSTER_ATTR(name, check_zero)                                        \
 143 static ssize_t name##_write(struct cluster *cl, const char *buf, size_t len)  \
 144 {                                                                             \
 145         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 146                            check_zero, buf, len);                             \
 147 }                                                                             \
 148 static ssize_t name##_read(struct cluster *cl, char *buf)                     \
 149 {                                                                             \
 150         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 151 }                                                                             \
 152 static struct cluster_attribute cluster_attr_##name =                         \
 153 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
 154
 155 CLUSTER_ATTR(tcp_port, 1);
 156 CLUSTER_ATTR(buffer_size, 1);
 157 CLUSTER_ATTR(rsbtbl_size, 1);
 158 CLUSTER_ATTR(lkbtbl_size, 1);
 159 CLUSTER_ATTR(dirtbl_size, 1);
 160 CLUSTER_ATTR(recover_timer, 1);
 161 CLUSTER_ATTR(toss_secs, 1);
 162 CLUSTER_ATTR(scan_secs, 1);
 163 CLUSTER_ATTR(log_debug, 0);
 164 CLUSTER_ATTR(protocol, 0);
 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         NULL,
 178 };
 179
 180 enum {
 181         COMM_ATTR_NODEID = 0,
 182         COMM_ATTR_LOCAL,
 183         COMM_ATTR_ADDR,
 184 };
 185
 186 struct comm_attribute {
 187         struct configfs_attribute attr;
 188         ssize_t (*show)(struct comm *, char *);
 189         ssize_t (*store)(struct comm *, const char *, size_t);
 190 };
 191
 192 static struct comm_attribute comm_attr_nodeid = {
 193         .attr   = { .ca_owner = THIS_MODULE,
 194                     .ca_name = "nodeid",
 195                     .ca_mode = S_IRUGO | S_IWUSR },
 196         .show   = comm_nodeid_read,
 197         .store  = comm_nodeid_write,
 198 };
 199
 200 static struct comm_attribute comm_attr_local = {
 201         .attr   = { .ca_owner = THIS_MODULE,
 202                     .ca_name = "local",
 203                     .ca_mode = S_IRUGO | S_IWUSR },
 204         .show   = comm_local_read,
 205         .store  = comm_local_write,
 206 };
 207
 208 static struct comm_attribute comm_attr_addr = {
 209         .attr   = { .ca_owner = THIS_MODULE,
 210                     .ca_name = "addr",
 211                     .ca_mode = S_IRUGO | S_IWUSR },
 212         .store  = comm_addr_write,
 213 };
 214
 215 static struct configfs_attribute *comm_attrs[] = {
 216         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
 217         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
 218         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
 219         NULL,
 220 };
 221
 222 enum {
 223         NODE_ATTR_NODEID = 0,
 224         NODE_ATTR_WEIGHT,
 225 };
 226
 227 struct node_attribute {
 228         struct configfs_attribute attr;
 229         ssize_t (*show)(struct node *, char *);
 230         ssize_t (*store)(struct node *, const char *, size_t);
 231 };
 232
 233 static struct node_attribute node_attr_nodeid = {
 234         .attr   = { .ca_owner = THIS_MODULE,
 235                     .ca_name = "nodeid",
 236                     .ca_mode = S_IRUGO | S_IWUSR },
 237         .show   = node_nodeid_read,
 238         .store  = node_nodeid_write,
 239 };
 240
 241 static struct node_attribute node_attr_weight = {
 242         .attr   = { .ca_owner = THIS_MODULE,
 243                     .ca_name = "weight",
 244                     .ca_mode = S_IRUGO | S_IWUSR },
 245         .show   = node_weight_read,
 246         .store  = node_weight_write,
 247 };
 248
 249 static struct configfs_attribute *node_attrs[] = {
 250         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
 251         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
 252         NULL,
 253 };
 254
 255 struct clusters {
 256         struct configfs_subsystem subsys;
 257 };
 258
 259 struct spaces {
 260         struct config_group ss_group;
 261 };
 262
 263 struct space {
 264         struct config_group group;
 265         struct list_head members;
 266         struct mutex members_lock;
 267         int members_count;
 268 };
 269
 270 struct comms {
 271         struct config_group cs_group;
 272 };
 273
 274 struct comm {
 275         struct config_item item;
 276         int nodeid;
 277         int local;
 278         int addr_count;
 279         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 280 };
 281
 282 struct nodes {
 283         struct config_group ns_group;
 284 };
 285
 286 struct node {
 287         struct config_item item;
 288         struct list_head list; /* space->members */
 289         int nodeid;
 290         int weight;
 291 };
 292
 293 static struct configfs_group_operations clusters_ops = {
 294         .make_group = make_cluster,
 295         .drop_item = drop_cluster,
 296 };
 297
 298 static struct configfs_item_operations cluster_ops = {
 299         .release = release_cluster,
 300         .show_attribute = show_cluster,
 301         .store_attribute = store_cluster,
 302 };
 303
 304 static struct configfs_group_operations spaces_ops = {
 305         .make_group = make_space,
 306         .drop_item = drop_space,
 307 };
 308
 309 static struct configfs_item_operations space_ops = {
 310         .release = release_space,
 311 };
 312
 313 static struct configfs_group_operations comms_ops = {
 314         .make_item = make_comm,
 315         .drop_item = drop_comm,
 316 };
 317
 318 static struct configfs_item_operations comm_ops = {
 319         .release = release_comm,
 320         .show_attribute = show_comm,
 321         .store_attribute = store_comm,
 322 };
 323
 324 static struct configfs_group_operations nodes_ops = {
 325         .make_item = make_node,
 326         .drop_item = drop_node,
 327 };
 328
 329 static struct configfs_item_operations node_ops = {
 330         .release = release_node,
 331         .show_attribute = show_node,
 332         .store_attribute = store_node,
 333 };
 334
 335 static struct config_item_type clusters_type = {
 336         .ct_group_ops = &clusters_ops,
 337         .ct_owner = THIS_MODULE,
 338 };
 339
 340 static struct config_item_type cluster_type = {
 341         .ct_item_ops = &cluster_ops,
 342         .ct_attrs = cluster_attrs,
 343         .ct_owner = THIS_MODULE,
 344 };
 345
 346 static struct config_item_type spaces_type = {
 347         .ct_group_ops = &spaces_ops,
 348         .ct_owner = THIS_MODULE,
 349 };
 350
 351 static struct config_item_type space_type = {
 352         .ct_item_ops = &space_ops,
 353         .ct_owner = THIS_MODULE,
 354 };
 355
 356 static struct config_item_type comms_type = {
 357         .ct_group_ops = &comms_ops,
 358         .ct_owner = THIS_MODULE,
 359 };
 360
 361 static struct config_item_type comm_type = {
 362         .ct_item_ops = &comm_ops,
 363         .ct_attrs = comm_attrs,
 364         .ct_owner = THIS_MODULE,
 365 };
 366
 367 static struct config_item_type nodes_type = {
 368         .ct_group_ops = &nodes_ops,
 369         .ct_owner = THIS_MODULE,
 370 };
 371
 372 static struct config_item_type node_type = {
 373         .ct_item_ops = &node_ops,
 374         .ct_attrs = node_attrs,
 375         .ct_owner = THIS_MODULE,
 376 };
 377
 378 static struct cluster *to_cluster(struct config_item *i)
 379 {
 380         return i ? container_of(to_config_group(i), struct cluster, group):NULL;
 381 }
 382
 383 static struct space *to_space(struct config_item *i)
 384 {
 385         return i ? container_of(to_config_group(i), struct space, group) : NULL;
 386 }
 387
 388 static struct comm *to_comm(struct config_item *i)
 389 {
 390         return i ? container_of(i, struct comm, item) : NULL;
 391 }
 392
 393 static struct node *to_node(struct config_item *i)
 394 {
 395         return i ? container_of(i, struct node, item) : NULL;
 396 }
 397
 398 static struct config_group *make_cluster(struct config_group *g,
 399                                          const char *name)
 400 {
 401         struct cluster *cl = NULL;
 402         struct spaces *sps = NULL;
 403         struct comms *cms = NULL;
 404         void *gps = NULL;
 405
 406         cl = kzalloc(sizeof(struct cluster), GFP_KERNEL);
 407         gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
 408         sps = kzalloc(sizeof(struct spaces), GFP_KERNEL);
 409         cms = kzalloc(sizeof(struct comms), GFP_KERNEL);
 410
 411         if (!cl || !gps || !sps || !cms)
 412                 goto fail;
 413
 414         config_group_init_type_name(&cl->group, name, &cluster_type);
 415         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 416         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 417
 418         cl->group.default_groups = gps;
 419         cl->group.default_groups[0] = &sps->ss_group;
 420         cl->group.default_groups[1] = &cms->cs_group;
 421         cl->group.default_groups[2] = NULL;
 422
 423         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 424         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 425         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 426         cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
 427         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
 428         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 429         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 430         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 431         cl->cl_log_debug = dlm_config.ci_log_debug;
 432
 433         space_list = &sps->ss_group;
 434         comm_list = &cms->cs_group;
 435         return &cl->group;
 436
 437  fail:
 438         kfree(cl);
 439         kfree(gps);
 440         kfree(sps);
 441         kfree(cms);
 442         return NULL;
 443 }
 444
 445 static void drop_cluster(struct config_group *g, struct config_item *i)
 446 {
 447         struct cluster *cl = to_cluster(i);
 448         struct config_item *tmp;
 449         int j;
 450
 451         for (j = 0; cl->group.default_groups[j]; j++) {
 452                 tmp = &cl->group.default_groups[j]->cg_item;
 453                 cl->group.default_groups[j] = NULL;
 454                 config_item_put(tmp);
 455         }
 456
 457         space_list = NULL;
 458         comm_list = NULL;
 459
 460         config_item_put(i);
 461 }
 462
 463 static void release_cluster(struct config_item *i)
 464 {
 465         struct cluster *cl = to_cluster(i);
 466         kfree(cl->group.default_groups);
 467         kfree(cl);
 468 }
 469
 470 static struct config_group *make_space(struct config_group *g, const char *name)
 471 {
 472         struct space *sp = NULL;
 473         struct nodes *nds = NULL;
 474         void *gps = NULL;
 475
 476         sp = kzalloc(sizeof(struct space), GFP_KERNEL);
 477         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
 478         nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
 479
 480         if (!sp || !gps || !nds)
 481                 goto fail;
 482
 483         config_group_init_type_name(&sp->group, name, &space_type);
 484         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 485
 486         sp->group.default_groups = gps;
 487         sp->group.default_groups[0] = &nds->ns_group;
 488         sp->group.default_groups[1] = NULL;
 489
 490         INIT_LIST_HEAD(&sp->members);
 491         mutex_init(&sp->members_lock);
 492         sp->members_count = 0;
 493         return &sp->group;
 494
 495  fail:
 496         kfree(sp);
 497         kfree(gps);
 498         kfree(nds);
 499         return NULL;
 500 }
 501
 502 static void drop_space(struct config_group *g, struct config_item *i)
 503 {
 504         struct space *sp = to_space(i);
 505         struct config_item *tmp;
 506         int j;
 507
 508         /* assert list_empty(&sp->members) */
 509
 510         for (j = 0; sp->group.default_groups[j]; j++) {
 511                 tmp = &sp->group.default_groups[j]->cg_item;
 512                 sp->group.default_groups[j] = NULL;
 513                 config_item_put(tmp);
 514         }
 515
 516         config_item_put(i);
 517 }
 518
 519 static void release_space(struct config_item *i)
 520 {
 521         struct space *sp = to_space(i);
 522         kfree(sp->group.default_groups);
 523         kfree(sp);
 524 }
 525
 526 static struct config_item *make_comm(struct config_group *g, const char *name)
 527 {
 528         struct comm *cm;
 529
 530         cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
 531         if (!cm)
 532                 return NULL;
 533
 534         config_item_init_type_name(&cm->item, name, &comm_type);
 535         cm->nodeid = -1;
 536         cm->local = 0;
 537         cm->addr_count = 0;
 538         return &cm->item;
 539 }
 540
 541 static void drop_comm(struct config_group *g, struct config_item *i)
 542 {
 543         struct comm *cm = to_comm(i);
 544         if (local_comm == cm)
 545                 local_comm = NULL;
 546         dlm_lowcomms_close(cm->nodeid);
 547         while (cm->addr_count--)
 548                 kfree(cm->addr[cm->addr_count]);
 549         config_item_put(i);
 550 }
 551
 552 static void release_comm(struct config_item *i)
 553 {
 554         struct comm *cm = to_comm(i);
 555         kfree(cm);
 556 }
 557
 558 static struct config_item *make_node(struct config_group *g, const char *name)
 559 {
 560         struct space *sp = to_space(g->cg_item.ci_parent);
 561         struct node *nd;
 562
 563         nd = kzalloc(sizeof(struct node), GFP_KERNEL);
 564         if (!nd)
 565                 return NULL;
 566
 567         config_item_init_type_name(&nd->item, name, &node_type);
 568         nd->nodeid = -1;
 569         nd->weight = 1;  /* default weight of 1 if none is set */
 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 dlm_config_init(void)
 610 {
 611         config_group_init(&clusters_root.subsys.su_group);
 612         init_MUTEX(&clusters_root.subsys.su_sem);
 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         if (!space_list)
 752                 return NULL;
 753         return to_space(config_group_find_obj(space_list, name));
 754 }
 755
 756 static void put_space(struct space *sp)
 757 {
 758         config_item_put(&sp->group.cg_item);
 759 }
 760
 761 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 762 {
 763         struct config_item *i;
 764         struct comm *cm = NULL;
 765         int found = 0;
 766
 767         if (!comm_list)
 768                 return NULL;
 769
 770         down(&clusters_root.subsys.su_sem);
 771
 772         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 773                 cm = to_comm(i);
 774
 775                 if (nodeid) {
 776                         if (cm->nodeid != nodeid)
 777                                 continue;
 778                         found = 1;
 779                         break;
 780                 } else {
 781                         if (!cm->addr_count ||
 782                             memcmp(cm->addr[0], addr, sizeof(*addr)))
 783                                 continue;
 784                         found = 1;
 785                         break;
 786                 }
 787         }
 788         up(&clusters_root.subsys.su_sem);
 789
 790         if (found)
 791                 config_item_get(i);
 792         else
 793                 cm = NULL;
 794         return cm;
 795 }
 796
 797 static void put_comm(struct comm *cm)
 798 {
 799         config_item_put(&cm->item);
 800 }
 801
 802 /* caller must free mem */
 803 int dlm_nodeid_list(char *lsname, int **ids_out)
 804 {
 805         struct space *sp;
 806         struct node *nd;
 807         int i = 0, rv = 0;
 808         int *ids;
 809
 810         sp = get_space(lsname);
 811         if (!sp)
 812                 return -EEXIST;
 813
 814         mutex_lock(&sp->members_lock);
 815         if (!sp->members_count) {
 816                 rv = 0;
 817                 goto out;
 818         }
 819
 820         ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL);
 821         if (!ids) {
 822                 rv = -ENOMEM;
 823                 goto out;
 824         }
 825
 826         rv = sp->members_count;
 827         list_for_each_entry(nd, &sp->members, list)
 828                 ids[i++] = nd->nodeid;
 829
 830         if (rv != i)
 831                 printk("bad nodeid count %d %d\n", rv, i);
 832
 833         *ids_out = ids;
 834  out:
 835         mutex_unlock(&sp->members_lock);
 836         put_space(sp);
 837         return rv;
 838 }
 839
 840 int dlm_node_weight(char *lsname, int nodeid)
 841 {
 842         struct space *sp;
 843         struct node *nd;
 844         int w = -EEXIST;
 845
 846         sp = get_space(lsname);
 847         if (!sp)
 848                 goto out;
 849
 850         mutex_lock(&sp->members_lock);
 851         list_for_each_entry(nd, &sp->members, list) {
 852                 if (nd->nodeid != nodeid)
 853                         continue;
 854                 w = nd->weight;
 855                 break;
 856         }
 857         mutex_unlock(&sp->members_lock);
 858         put_space(sp);
 859  out:
 860         return w;
 861 }
 862
 863 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
 864 {
 865         struct comm *cm = get_comm(nodeid, NULL);
 866         if (!cm)
 867                 return -EEXIST;
 868         if (!cm->addr_count)
 869                 return -ENOENT;
 870         memcpy(addr, cm->addr[0], sizeof(*addr));
 871         put_comm(cm);
 872         return 0;
 873 }
 874
 875 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
 876 {
 877         struct comm *cm = get_comm(0, addr);
 878         if (!cm)
 879                 return -EEXIST;
 880         *nodeid = cm->nodeid;
 881         put_comm(cm);
 882         return 0;
 883 }
 884
 885 int dlm_our_nodeid(void)
 886 {
 887         return local_comm ? local_comm->nodeid : 0;
 888 }
 889
 890 /* num 0 is first addr, num 1 is second addr */
 891 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 892 {
 893         if (!local_comm)
 894                 return -1;
 895         if (num + 1 > local_comm->addr_count)
 896                 return -1;
 897         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 898         return 0;
 899 }
 900
 901 /* Config file defaults */
 902 #define DEFAULT_TCP_PORT       21064
 903 #define DEFAULT_BUFFER_SIZE     4096
 904 #define DEFAULT_RSBTBL_SIZE      256
 905 #define DEFAULT_LKBTBL_SIZE     1024
 906 #define DEFAULT_DIRTBL_SIZE      512
 907 #define DEFAULT_RECOVER_TIMER      5
 908 #define DEFAULT_TOSS_SECS         10
 909 #define DEFAULT_SCAN_SECS          5
 910 #define DEFAULT_LOG_DEBUG          0
 911 #define DEFAULT_PROTOCOL           0
 912
 913 struct dlm_config_info dlm_config = {
 914         .ci_tcp_port = DEFAULT_TCP_PORT,
 915         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 916         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 917         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
 918         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
 919         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 920         .ci_toss_secs = DEFAULT_TOSS_SECS,
 921         .ci_scan_secs = DEFAULT_SCAN_SECS,
 922         .ci_log_debug = DEFAULT_LOG_DEBUG,
 923         .ci_protocol = DEFAULT_PROTOCOL
 924 };
 925