fs/dlm/config.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2005 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 };
  93
  94 enum {
  95         CLUSTER_ATTR_TCP_PORT = 0,
  96         CLUSTER_ATTR_BUFFER_SIZE,
  97         CLUSTER_ATTR_RSBTBL_SIZE,
  98         CLUSTER_ATTR_LKBTBL_SIZE,
  99         CLUSTER_ATTR_DIRTBL_SIZE,
 100         CLUSTER_ATTR_RECOVER_TIMER,
 101         CLUSTER_ATTR_TOSS_SECS,
 102         CLUSTER_ATTR_SCAN_SECS,
 103         CLUSTER_ATTR_LOG_DEBUG,
 104 };
 105
 106 struct cluster_attribute {
 107         struct configfs_attribute attr;
 108         ssize_t (*show)(struct cluster *, char *);
 109         ssize_t (*store)(struct cluster *, const char *, size_t);
 110 };
 111
 112 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
 113                            unsigned int *info_field, int check_zero,
 114                            const char *buf, size_t len)
 115 {
 116         unsigned int x;
 117
 118         if (!capable(CAP_SYS_ADMIN))
 119                 return -EACCES;
 120
 121         x = simple_strtoul(buf, NULL, 0);
 122
 123         if (check_zero && !x)
 124                 return -EINVAL;
 125
 126         *cl_field = x;
 127         *info_field = x;
 128
 129         return len;
 130 }
 131
 132 #define __CONFIGFS_ATTR(_name,_mode,_read,_write) {                           \
 133         .attr   = { .ca_name = __stringify(_name),                            \
 134                     .ca_mode = _mode,                                         \
 135                     .ca_owner = THIS_MODULE },                                \
 136         .show   = _read,                                                      \
 137         .store  = _write,                                                     \
 138 }
 139
 140 #define CLUSTER_ATTR(name, check_zero)                                        \
 141 static ssize_t name##_write(struct cluster *cl, const char *buf, size_t len)  \
 142 {                                                                             \
 143         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 144                            check_zero, buf, len);                             \
 145 }                                                                             \
 146 static ssize_t name##_read(struct cluster *cl, char *buf)                     \
 147 {                                                                             \
 148         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 149 }                                                                             \
 150 static struct cluster_attribute cluster_attr_##name =                         \
 151 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
 152
 153 CLUSTER_ATTR(tcp_port, 1);
 154 CLUSTER_ATTR(buffer_size, 1);
 155 CLUSTER_ATTR(rsbtbl_size, 1);
 156 CLUSTER_ATTR(lkbtbl_size, 1);
 157 CLUSTER_ATTR(dirtbl_size, 1);
 158 CLUSTER_ATTR(recover_timer, 1);
 159 CLUSTER_ATTR(toss_secs, 1);
 160 CLUSTER_ATTR(scan_secs, 1);
 161 CLUSTER_ATTR(log_debug, 0);
 162
 163 static struct configfs_attribute *cluster_attrs[] = {
 164         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
 165         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
 166         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
 167         [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
 168         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
 169         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
 170         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
 171         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
 172         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.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 };
 288
 289 static struct configfs_group_operations clusters_ops = {
 290         .make_group = make_cluster,
 291         .drop_item = drop_cluster,
 292 };
 293
 294 static struct configfs_item_operations cluster_ops = {
 295         .release = release_cluster,
 296         .show_attribute = show_cluster,
 297         .store_attribute = store_cluster,
 298 };
 299
 300 static struct configfs_group_operations spaces_ops = {
 301         .make_group = make_space,
 302         .drop_item = drop_space,
 303 };
 304
 305 static struct configfs_item_operations space_ops = {
 306         .release = release_space,
 307 };
 308
 309 static struct configfs_group_operations comms_ops = {
 310         .make_item = make_comm,
 311         .drop_item = drop_comm,
 312 };
 313
 314 static struct configfs_item_operations comm_ops = {
 315         .release = release_comm,
 316         .show_attribute = show_comm,
 317         .store_attribute = store_comm,
 318 };
 319
 320 static struct configfs_group_operations nodes_ops = {
 321         .make_item = make_node,
 322         .drop_item = drop_node,
 323 };
 324
 325 static struct configfs_item_operations node_ops = {
 326         .release = release_node,
 327         .show_attribute = show_node,
 328         .store_attribute = store_node,
 329 };
 330
 331 static struct config_item_type clusters_type = {
 332         .ct_group_ops = &clusters_ops,
 333         .ct_owner = THIS_MODULE,
 334 };
 335
 336 static struct config_item_type cluster_type = {
 337         .ct_item_ops = &cluster_ops,
 338         .ct_attrs = cluster_attrs,
 339         .ct_owner = THIS_MODULE,
 340 };
 341
 342 static struct config_item_type spaces_type = {
 343         .ct_group_ops = &spaces_ops,
 344         .ct_owner = THIS_MODULE,
 345 };
 346
 347 static struct config_item_type space_type = {
 348         .ct_item_ops = &space_ops,
 349         .ct_owner = THIS_MODULE,
 350 };
 351
 352 static struct config_item_type comms_type = {
 353         .ct_group_ops = &comms_ops,
 354         .ct_owner = THIS_MODULE,
 355 };
 356
 357 static struct config_item_type comm_type = {
 358         .ct_item_ops = &comm_ops,
 359         .ct_attrs = comm_attrs,
 360         .ct_owner = THIS_MODULE,
 361 };
 362
 363 static struct config_item_type nodes_type = {
 364         .ct_group_ops = &nodes_ops,
 365         .ct_owner = THIS_MODULE,
 366 };
 367
 368 static struct config_item_type node_type = {
 369         .ct_item_ops = &node_ops,
 370         .ct_attrs = node_attrs,
 371         .ct_owner = THIS_MODULE,
 372 };
 373
 374 static struct cluster *to_cluster(struct config_item *i)
 375 {
 376         return i ? container_of(to_config_group(i), struct cluster, group):NULL;
 377 }
 378
 379 static struct space *to_space(struct config_item *i)
 380 {
 381         return i ? container_of(to_config_group(i), struct space, group) : NULL;
 382 }
 383
 384 static struct comm *to_comm(struct config_item *i)
 385 {
 386         return i ? container_of(i, struct comm, item) : NULL;
 387 }
 388
 389 static struct node *to_node(struct config_item *i)
 390 {
 391         return i ? container_of(i, struct node, item) : NULL;
 392 }
 393
 394 static struct config_group *make_cluster(struct config_group *g,
 395                                          const char *name)
 396 {
 397         struct cluster *cl = NULL;
 398         struct spaces *sps = NULL;
 399         struct comms *cms = NULL;
 400         void *gps = NULL;
 401
 402         cl = kzalloc(sizeof(struct cluster), GFP_KERNEL);
 403         gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
 404         sps = kzalloc(sizeof(struct spaces), GFP_KERNEL);
 405         cms = kzalloc(sizeof(struct comms), GFP_KERNEL);
 406
 407         if (!cl || !gps || !sps || !cms)
 408                 goto fail;
 409
 410         config_group_init_type_name(&cl->group, name, &cluster_type);
 411         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 412         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 413
 414         cl->group.default_groups = gps;
 415         cl->group.default_groups[0] = &sps->ss_group;
 416         cl->group.default_groups[1] = &cms->cs_group;
 417         cl->group.default_groups[2] = NULL;
 418
 419         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 420         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 421         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 422         cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
 423         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
 424         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 425         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 426         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 427         cl->cl_log_debug = dlm_config.ci_log_debug;
 428
 429         space_list = &sps->ss_group;
 430         comm_list = &cms->cs_group;
 431         return &cl->group;
 432
 433  fail:
 434         kfree(cl);
 435         kfree(gps);
 436         kfree(sps);
 437         kfree(cms);
 438         return NULL;
 439 }
 440
 441 static void drop_cluster(struct config_group *g, struct config_item *i)
 442 {
 443         struct cluster *cl = to_cluster(i);
 444         struct config_item *tmp;
 445         int j;
 446
 447         for (j = 0; cl->group.default_groups[j]; j++) {
 448                 tmp = &cl->group.default_groups[j]->cg_item;
 449                 cl->group.default_groups[j] = NULL;
 450                 config_item_put(tmp);
 451         }
 452
 453         space_list = NULL;
 454         comm_list = NULL;
 455
 456         config_item_put(i);
 457 }
 458
 459 static void release_cluster(struct config_item *i)
 460 {
 461         struct cluster *cl = to_cluster(i);
 462         kfree(cl->group.default_groups);
 463         kfree(cl);
 464 }
 465
 466 static struct config_group *make_space(struct config_group *g, const char *name)
 467 {
 468         struct space *sp = NULL;
 469         struct nodes *nds = NULL;
 470         void *gps = NULL;
 471
 472         sp = kzalloc(sizeof(struct space), GFP_KERNEL);
 473         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
 474         nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
 475
 476         if (!sp || !gps || !nds)
 477                 goto fail;
 478
 479         config_group_init_type_name(&sp->group, name, &space_type);
 480         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 481
 482         sp->group.default_groups = gps;
 483         sp->group.default_groups[0] = &nds->ns_group;
 484         sp->group.default_groups[1] = NULL;
 485
 486         INIT_LIST_HEAD(&sp->members);
 487         mutex_init(&sp->members_lock);
 488         sp->members_count = 0;
 489         return &sp->group;
 490
 491  fail:
 492         kfree(sp);
 493         kfree(gps);
 494         kfree(nds);
 495         return NULL;
 496 }
 497
 498 static void drop_space(struct config_group *g, struct config_item *i)
 499 {
 500         struct space *sp = to_space(i);
 501         struct config_item *tmp;
 502         int j;
 503
 504         /* assert list_empty(&sp->members) */
 505
 506         for (j = 0; sp->group.default_groups[j]; j++) {
 507                 tmp = &sp->group.default_groups[j]->cg_item;
 508                 sp->group.default_groups[j] = NULL;
 509                 config_item_put(tmp);
 510         }
 511
 512         config_item_put(i);
 513 }
 514
 515 static void release_space(struct config_item *i)
 516 {
 517         struct space *sp = to_space(i);
 518         kfree(sp->group.default_groups);
 519         kfree(sp);
 520 }
 521
 522 static struct config_item *make_comm(struct config_group *g, const char *name)
 523 {
 524         struct comm *cm;
 525
 526         cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
 527         if (!cm)
 528                 return NULL;
 529
 530         config_item_init_type_name(&cm->item, name, &comm_type);
 531         cm->nodeid = -1;
 532         cm->local = 0;
 533         cm->addr_count = 0;
 534         return &cm->item;
 535 }
 536
 537 static void drop_comm(struct config_group *g, struct config_item *i)
 538 {
 539         struct comm *cm = to_comm(i);
 540         if (local_comm == cm)
 541                 local_comm = NULL;
 542         dlm_lowcomms_close(cm->nodeid);
 543         while (cm->addr_count--)
 544                 kfree(cm->addr[cm->addr_count]);
 545         config_item_put(i);
 546 }
 547
 548 static void release_comm(struct config_item *i)
 549 {
 550         struct comm *cm = to_comm(i);
 551         kfree(cm);
 552 }
 553
 554 static struct config_item *make_node(struct config_group *g, const char *name)
 555 {
 556         struct space *sp = to_space(g->cg_item.ci_parent);
 557         struct node *nd;
 558
 559         nd = kzalloc(sizeof(struct node), GFP_KERNEL);
 560         if (!nd)
 561                 return NULL;
 562
 563         config_item_init_type_name(&nd->item, name, &node_type);
 564         nd->nodeid = -1;
 565         nd->weight = 1;  /* default weight of 1 if none is set */
 566
 567         mutex_lock(&sp->members_lock);
 568         list_add(&nd->list, &sp->members);
 569         sp->members_count++;
 570         mutex_unlock(&sp->members_lock);
 571
 572         return &nd->item;
 573 }
 574
 575 static void drop_node(struct config_group *g, struct config_item *i)
 576 {
 577         struct space *sp = to_space(g->cg_item.ci_parent);
 578         struct node *nd = to_node(i);
 579
 580         mutex_lock(&sp->members_lock);
 581         list_del(&nd->list);
 582         sp->members_count--;
 583         mutex_unlock(&sp->members_lock);
 584
 585         config_item_put(i);
 586 }
 587
 588 static void release_node(struct config_item *i)
 589 {
 590         struct node *nd = to_node(i);
 591         kfree(nd);
 592 }
 593
 594 static struct clusters clusters_root = {
 595         .subsys = {
 596                 .su_group = {
 597                         .cg_item = {
 598                                 .ci_namebuf = "dlm",
 599                                 .ci_type = &clusters_type,
 600                         },
 601                 },
 602         },
 603 };
 604
 605 int dlm_config_init(void)
 606 {
 607         config_group_init(&clusters_root.subsys.su_group);
 608         init_MUTEX(&clusters_root.subsys.su_sem);
 609         return configfs_register_subsystem(&clusters_root.subsys);
 610 }
 611
 612 void dlm_config_exit(void)
 613 {
 614         configfs_unregister_subsystem(&clusters_root.subsys);
 615 }
 616
 617 /*
 618  * Functions for user space to read/write attributes
 619  */
 620
 621 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 622                             char *buf)
 623 {
 624         struct cluster *cl = to_cluster(i);
 625         struct cluster_attribute *cla =
 626                         container_of(a, struct cluster_attribute, attr);
 627         return cla->show ? cla->show(cl, buf) : 0;
 628 }
 629
 630 static ssize_t store_cluster(struct config_item *i,
 631                              struct configfs_attribute *a,
 632                              const char *buf, size_t len)
 633 {
 634         struct cluster *cl = to_cluster(i);
 635         struct cluster_attribute *cla =
 636                 container_of(a, struct cluster_attribute, attr);
 637         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 638 }
 639
 640 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 641                          char *buf)
 642 {
 643         struct comm *cm = to_comm(i);
 644         struct comm_attribute *cma =
 645                         container_of(a, struct comm_attribute, attr);
 646         return cma->show ? cma->show(cm, buf) : 0;
 647 }
 648
 649 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 650                           const char *buf, size_t len)
 651 {
 652         struct comm *cm = to_comm(i);
 653         struct comm_attribute *cma =
 654                 container_of(a, struct comm_attribute, attr);
 655         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 656 }
 657
 658 static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
 659 {
 660         return sprintf(buf, "%d\n", cm->nodeid);
 661 }
 662
 663 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len)
 664 {
 665         cm->nodeid = simple_strtol(buf, NULL, 0);
 666         return len;
 667 }
 668
 669 static ssize_t comm_local_read(struct comm *cm, char *buf)
 670 {
 671         return sprintf(buf, "%d\n", cm->local);
 672 }
 673
 674 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
 675 {
 676         cm->local= simple_strtol(buf, NULL, 0);
 677         if (cm->local && !local_comm)
 678                 local_comm = cm;
 679         return len;
 680 }
 681
 682 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
 683 {
 684         struct sockaddr_storage *addr;
 685
 686         if (len != sizeof(struct sockaddr_storage))
 687                 return -EINVAL;
 688
 689         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 690                 return -ENOSPC;
 691
 692         addr = kzalloc(sizeof(*addr), GFP_KERNEL);
 693         if (!addr)
 694                 return -ENOMEM;
 695
 696         memcpy(addr, buf, len);
 697         cm->addr[cm->addr_count++] = addr;
 698         return len;
 699 }
 700
 701 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 702                          char *buf)
 703 {
 704         struct node *nd = to_node(i);
 705         struct node_attribute *nda =
 706                         container_of(a, struct node_attribute, attr);
 707         return nda->show ? nda->show(nd, buf) : 0;
 708 }
 709
 710 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 711                           const char *buf, size_t len)
 712 {
 713         struct node *nd = to_node(i);
 714         struct node_attribute *nda =
 715                 container_of(a, struct node_attribute, attr);
 716         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 717 }
 718
 719 static ssize_t node_nodeid_read(struct node *nd, char *buf)
 720 {
 721         return sprintf(buf, "%d\n", nd->nodeid);
 722 }
 723
 724 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
 725 {
 726         nd->nodeid = simple_strtol(buf, NULL, 0);
 727         return len;
 728 }
 729
 730 static ssize_t node_weight_read(struct node *nd, char *buf)
 731 {
 732         return sprintf(buf, "%d\n", nd->weight);
 733 }
 734
 735 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
 736 {
 737         nd->weight = simple_strtol(buf, NULL, 0);
 738         return len;
 739 }
 740
 741 /*
 742  * Functions for the dlm to get the info that's been configured
 743  */
 744
 745 static struct space *get_space(char *name)
 746 {
 747         if (!space_list)
 748                 return NULL;
 749         return to_space(config_group_find_obj(space_list, name));
 750 }
 751
 752 static void put_space(struct space *sp)
 753 {
 754         config_item_put(&sp->group.cg_item);
 755 }
 756
 757 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 758 {
 759         struct config_item *i;
 760         struct comm *cm = NULL;
 761         int found = 0;
 762
 763         if (!comm_list)
 764                 return NULL;
 765
 766         down(&clusters_root.subsys.su_sem);
 767
 768         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 769                 cm = to_comm(i);
 770
 771                 if (nodeid) {
 772                         if (cm->nodeid != nodeid)
 773                                 continue;
 774                         found = 1;
 775                         break;
 776                 } else {
 777                         if (!cm->addr_count ||
 778                             memcmp(cm->addr[0], addr, sizeof(*addr)))
 779                                 continue;
 780                         found = 1;
 781                         break;
 782                 }
 783         }
 784         up(&clusters_root.subsys.su_sem);
 785
 786         if (found)
 787                 config_item_get(i);
 788         else
 789                 cm = NULL;
 790         return cm;
 791 }
 792
 793 static void put_comm(struct comm *cm)
 794 {
 795         config_item_put(&cm->item);
 796 }
 797
 798 /* caller must free mem */
 799 int dlm_nodeid_list(char *lsname, int **ids_out)
 800 {
 801         struct space *sp;
 802         struct node *nd;
 803         int i = 0, rv = 0;
 804         int *ids;
 805
 806         sp = get_space(lsname);
 807         if (!sp)
 808                 return -EEXIST;
 809
 810         mutex_lock(&sp->members_lock);
 811         if (!sp->members_count) {
 812                 rv = 0;
 813                 goto out;
 814         }
 815
 816         ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL);
 817         if (!ids) {
 818                 rv = -ENOMEM;
 819                 goto out;
 820         }
 821
 822         rv = sp->members_count;
 823         list_for_each_entry(nd, &sp->members, list)
 824                 ids[i++] = nd->nodeid;
 825
 826         if (rv != i)
 827                 printk("bad nodeid count %d %d\n", rv, i);
 828
 829         *ids_out = ids;
 830  out:
 831         mutex_unlock(&sp->members_lock);
 832         put_space(sp);
 833         return rv;
 834 }
 835
 836 int dlm_node_weight(char *lsname, int nodeid)
 837 {
 838         struct space *sp;
 839         struct node *nd;
 840         int w = -EEXIST;
 841
 842         sp = get_space(lsname);
 843         if (!sp)
 844                 goto out;
 845
 846         mutex_lock(&sp->members_lock);
 847         list_for_each_entry(nd, &sp->members, list) {
 848                 if (nd->nodeid != nodeid)
 849                         continue;
 850                 w = nd->weight;
 851                 break;
 852         }
 853         mutex_unlock(&sp->members_lock);
 854         put_space(sp);
 855  out:
 856         return w;
 857 }
 858
 859 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
 860 {
 861         struct comm *cm = get_comm(nodeid, NULL);
 862         if (!cm)
 863                 return -EEXIST;
 864         if (!cm->addr_count)
 865                 return -ENOENT;
 866         memcpy(addr, cm->addr[0], sizeof(*addr));
 867         put_comm(cm);
 868         return 0;
 869 }
 870
 871 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
 872 {
 873         struct comm *cm = get_comm(0, addr);
 874         if (!cm)
 875                 return -EEXIST;
 876         *nodeid = cm->nodeid;
 877         put_comm(cm);
 878         return 0;
 879 }
 880
 881 int dlm_our_nodeid(void)
 882 {
 883         return local_comm ? local_comm->nodeid : 0;
 884 }
 885
 886 /* num 0 is first addr, num 1 is second addr */
 887 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 888 {
 889         if (!local_comm)
 890                 return -1;
 891         if (num + 1 > local_comm->addr_count)
 892                 return -1;
 893         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 894         return 0;
 895 }
 896
 897 /* Config file defaults */
 898 #define DEFAULT_TCP_PORT       21064
 899 #define DEFAULT_BUFFER_SIZE     4096
 900 #define DEFAULT_RSBTBL_SIZE      256
 901 #define DEFAULT_LKBTBL_SIZE     1024
 902 #define DEFAULT_DIRTBL_SIZE      512
 903 #define DEFAULT_RECOVER_TIMER      5
 904 #define DEFAULT_TOSS_SECS         10
 905 #define DEFAULT_SCAN_SECS          5
 906 #define DEFAULT_LOG_DEBUG          0
 907
 908 struct dlm_config_info dlm_config = {
 909         .ci_tcp_port = DEFAULT_TCP_PORT,
 910         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 911         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 912         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
 913         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
 914         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 915         .ci_toss_secs = DEFAULT_TOSS_SECS,
 916         .ci_scan_secs = DEFAULT_SCAN_SECS,
 917         .ci_log_debug = DEFAULT_LOG_DEBUG
 918 };
 919