git.oblomov.eu Git - linux-2.6/blob - 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 int make_cluster(struct config_group *, const char *,
  45                         struct config_group **);
  46 static void drop_cluster(struct config_group *, struct config_item *);
  47 static void release_cluster(struct config_item *);
  48 static int make_space(struct config_group *, const char *,
  49                       struct config_group **);
  50 static void drop_space(struct config_group *, struct config_item *);
  51 static void release_space(struct config_item *);
  52 static int make_comm(struct config_group *, const char *,
  53                      struct config_item **);
  54 static void drop_comm(struct config_group *, struct config_item *);
  55 static void release_comm(struct config_item *);
  56 static int make_node(struct config_group *, const char *,
  57                      struct config_item **);
  58 static void drop_node(struct config_group *, struct config_item *);
  59 static void release_node(struct config_item *);
  60
  61 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
  62                             char *buf);
  63 static ssize_t store_cluster(struct config_item *i,
  64                              struct configfs_attribute *a,
  65                              const char *buf, size_t len);
  66 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
  67                          char *buf);
  68 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
  69                           const char *buf, size_t len);
  70 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
  71                          char *buf);
  72 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
  73                           const char *buf, size_t len);
  74
  75 static ssize_t comm_nodeid_read(struct comm *cm, char *buf);
  76 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len);
  77 static ssize_t comm_local_read(struct comm *cm, char *buf);
  78 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len);
  79 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len);
  80 static ssize_t node_nodeid_read(struct node *nd, char *buf);
  81 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len);
  82 static ssize_t node_weight_read(struct node *nd, char *buf);
  83 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len);
  84
  85 struct cluster {
  86         struct config_group group;
  87         unsigned int cl_tcp_port;
  88         unsigned int cl_buffer_size;
  89         unsigned int cl_rsbtbl_size;
  90         unsigned int cl_lkbtbl_size;
  91         unsigned int cl_dirtbl_size;
  92         unsigned int cl_recover_timer;
  93         unsigned int cl_toss_secs;
  94         unsigned int cl_scan_secs;
  95         unsigned int cl_log_debug;
  96         unsigned int cl_protocol;
  97         unsigned int cl_timewarn_cs;
  98 };
  99
 100 enum {
 101         CLUSTER_ATTR_TCP_PORT = 0,
 102         CLUSTER_ATTR_BUFFER_SIZE,
 103         CLUSTER_ATTR_RSBTBL_SIZE,
 104         CLUSTER_ATTR_LKBTBL_SIZE,
 105         CLUSTER_ATTR_DIRTBL_SIZE,
 106         CLUSTER_ATTR_RECOVER_TIMER,
 107         CLUSTER_ATTR_TOSS_SECS,
 108         CLUSTER_ATTR_SCAN_SECS,
 109         CLUSTER_ATTR_LOG_DEBUG,
 110         CLUSTER_ATTR_PROTOCOL,
 111         CLUSTER_ATTR_TIMEWARN_CS,
 112 };
 113
 114 struct cluster_attribute {
 115         struct configfs_attribute attr;
 116         ssize_t (*show)(struct cluster *, char *);
 117         ssize_t (*store)(struct cluster *, const char *, size_t);
 118 };
 119
 120 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
 121                            int *info_field, int check_zero,
 122                            const char *buf, size_t len)
 123 {
 124         unsigned int x;
 125
 126         if (!capable(CAP_SYS_ADMIN))
 127                 return -EACCES;
 128
 129         x = simple_strtoul(buf, NULL, 0);
 130
 131         if (check_zero && !x)
 132                 return -EINVAL;
 133
 134         *cl_field = x;
 135         *info_field = x;
 136
 137         return len;
 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 CLUSTER_ATTR(protocol, 0);
 163 CLUSTER_ATTR(timewarn_cs, 1);
 164
 165 static struct configfs_attribute *cluster_attrs[] = {
 166         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
 167         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
 168         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
 169         [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
 170         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
 171         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
 172         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
 173         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
 174         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
 175         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
 176         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.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         int new;
 292 };
 293
 294 static struct configfs_group_operations clusters_ops = {
 295         .make_group = make_cluster,
 296         .drop_item = drop_cluster,
 297 };
 298
 299 static struct configfs_item_operations cluster_ops = {
 300         .release = release_cluster,
 301         .show_attribute = show_cluster,
 302         .store_attribute = store_cluster,
 303 };
 304
 305 static struct configfs_group_operations spaces_ops = {
 306         .make_group = make_space,
 307         .drop_item = drop_space,
 308 };
 309
 310 static struct configfs_item_operations space_ops = {
 311         .release = release_space,
 312 };
 313
 314 static struct configfs_group_operations comms_ops = {
 315         .make_item = make_comm,
 316         .drop_item = drop_comm,
 317 };
 318
 319 static struct configfs_item_operations comm_ops = {
 320         .release = release_comm,
 321         .show_attribute = show_comm,
 322         .store_attribute = store_comm,
 323 };
 324
 325 static struct configfs_group_operations nodes_ops = {
 326         .make_item = make_node,
 327         .drop_item = drop_node,
 328 };
 329
 330 static struct configfs_item_operations node_ops = {
 331         .release = release_node,
 332         .show_attribute = show_node,
 333         .store_attribute = store_node,
 334 };
 335
 336 static struct config_item_type clusters_type = {
 337         .ct_group_ops = &clusters_ops,
 338         .ct_owner = THIS_MODULE,
 339 };
 340
 341 static struct config_item_type cluster_type = {
 342         .ct_item_ops = &cluster_ops,
 343         .ct_attrs = cluster_attrs,
 344         .ct_owner = THIS_MODULE,
 345 };
 346
 347 static struct config_item_type spaces_type = {
 348         .ct_group_ops = &spaces_ops,
 349         .ct_owner = THIS_MODULE,
 350 };
 351
 352 static struct config_item_type space_type = {
 353         .ct_item_ops = &space_ops,
 354         .ct_owner = THIS_MODULE,
 355 };
 356
 357 static struct config_item_type comms_type = {
 358         .ct_group_ops = &comms_ops,
 359         .ct_owner = THIS_MODULE,
 360 };
 361
 362 static struct config_item_type comm_type = {
 363         .ct_item_ops = &comm_ops,
 364         .ct_attrs = comm_attrs,
 365         .ct_owner = THIS_MODULE,
 366 };
 367
 368 static struct config_item_type nodes_type = {
 369         .ct_group_ops = &nodes_ops,
 370         .ct_owner = THIS_MODULE,
 371 };
 372
 373 static struct config_item_type node_type = {
 374         .ct_item_ops = &node_ops,
 375         .ct_attrs = node_attrs,
 376         .ct_owner = THIS_MODULE,
 377 };
 378
 379 static struct cluster *to_cluster(struct config_item *i)
 380 {
 381         return i ? container_of(to_config_group(i), struct cluster, group):NULL;
 382 }
 383
 384 static struct space *to_space(struct config_item *i)
 385 {
 386         return i ? container_of(to_config_group(i), struct space, group) : NULL;
 387 }
 388
 389 static struct comm *to_comm(struct config_item *i)
 390 {
 391         return i ? container_of(i, struct comm, item) : NULL;
 392 }
 393
 394 static struct node *to_node(struct config_item *i)
 395 {
 396         return i ? container_of(i, struct node, item) : NULL;
 397 }
 398
 399 static int make_cluster(struct config_group *g, const char *name,
 400                         struct config_group **new_g)
 401 {
 402         struct cluster *cl = NULL;
 403         struct spaces *sps = NULL;
 404         struct comms *cms = NULL;
 405         void *gps = NULL;
 406
 407         cl = kzalloc(sizeof(struct cluster), GFP_KERNEL);
 408         gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL);
 409         sps = kzalloc(sizeof(struct spaces), GFP_KERNEL);
 410         cms = kzalloc(sizeof(struct comms), GFP_KERNEL);
 411
 412         if (!cl || !gps || !sps || !cms)
 413                 goto fail;
 414
 415         config_group_init_type_name(&cl->group, name, &cluster_type);
 416         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 417         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 418
 419         cl->group.default_groups = gps;
 420         cl->group.default_groups[0] = &sps->ss_group;
 421         cl->group.default_groups[1] = &cms->cs_group;
 422         cl->group.default_groups[2] = NULL;
 423
 424         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 425         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 426         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 427         cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size;
 428         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
 429         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 430         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 431         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 432         cl->cl_log_debug = dlm_config.ci_log_debug;
 433         cl->cl_protocol = dlm_config.ci_protocol;
 434         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 435
 436         space_list = &sps->ss_group;
 437         comm_list = &cms->cs_group;
 438         *new_g = &cl->group;
 439         return 0;
 440
 441  fail:
 442         kfree(cl);
 443         kfree(gps);
 444         kfree(sps);
 445         kfree(cms);
 446         return -ENOMEM;
 447 }
 448
 449 static void drop_cluster(struct config_group *g, struct config_item *i)
 450 {
 451         struct cluster *cl = to_cluster(i);
 452         struct config_item *tmp;
 453         int j;
 454
 455         for (j = 0; cl->group.default_groups[j]; j++) {
 456                 tmp = &cl->group.default_groups[j]->cg_item;
 457                 cl->group.default_groups[j] = NULL;
 458                 config_item_put(tmp);
 459         }
 460
 461         space_list = NULL;
 462         comm_list = NULL;
 463
 464         config_item_put(i);
 465 }
 466
 467 static void release_cluster(struct config_item *i)
 468 {
 469         struct cluster *cl = to_cluster(i);
 470         kfree(cl->group.default_groups);
 471         kfree(cl);
 472 }
 473
 474 static int make_space(struct config_group *g, const char *name,
 475                       struct config_group **new_g)
 476 {
 477         struct space *sp = NULL;
 478         struct nodes *nds = NULL;
 479         void *gps = NULL;
 480
 481         sp = kzalloc(sizeof(struct space), GFP_KERNEL);
 482         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
 483         nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
 484
 485         if (!sp || !gps || !nds)
 486                 goto fail;
 487
 488         config_group_init_type_name(&sp->group, name, &space_type);
 489         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 490
 491         sp->group.default_groups = gps;
 492         sp->group.default_groups[0] = &nds->ns_group;
 493         sp->group.default_groups[1] = NULL;
 494
 495         INIT_LIST_HEAD(&sp->members);
 496         mutex_init(&sp->members_lock);
 497         sp->members_count = 0;
 498         *new_g = &sp->group;
 499         return 0;
 500
 501  fail:
 502         kfree(sp);
 503         kfree(gps);
 504         kfree(nds);
 505         return -ENOMEM;
 506 }
 507
 508 static void drop_space(struct config_group *g, struct config_item *i)
 509 {
 510         struct space *sp = to_space(i);
 511         struct config_item *tmp;
 512         int j;
 513
 514         /* assert list_empty(&sp->members) */
 515
 516         for (j = 0; sp->group.default_groups[j]; j++) {
 517                 tmp = &sp->group.default_groups[j]->cg_item;
 518                 sp->group.default_groups[j] = NULL;
 519                 config_item_put(tmp);
 520         }
 521
 522         config_item_put(i);
 523 }
 524
 525 static void release_space(struct config_item *i)
 526 {
 527         struct space *sp = to_space(i);
 528         kfree(sp->group.default_groups);
 529         kfree(sp);
 530 }
 531
 532 static int make_comm(struct config_group *g, const char *name,
 533                      struct config_item **new_i)
 534 {
 535         struct comm *cm;
 536
 537         cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
 538         if (!cm)
 539                 return -ENOMEM;
 540
 541         config_item_init_type_name(&cm->item, name, &comm_type);
 542         cm->nodeid = -1;
 543         cm->local = 0;
 544         cm->addr_count = 0;
 545         *new_i = &cm->item;
 546         return 0;
 547 }
 548
 549 static void drop_comm(struct config_group *g, struct config_item *i)
 550 {
 551         struct comm *cm = to_comm(i);
 552         if (local_comm == cm)
 553                 local_comm = NULL;
 554         dlm_lowcomms_close(cm->nodeid);
 555         while (cm->addr_count--)
 556                 kfree(cm->addr[cm->addr_count]);
 557         config_item_put(i);
 558 }
 559
 560 static void release_comm(struct config_item *i)
 561 {
 562         struct comm *cm = to_comm(i);
 563         kfree(cm);
 564 }
 565
 566 static int make_node(struct config_group *g, const char *name,
 567                      struct config_item **new_i)
 568 {
 569         struct space *sp = to_space(g->cg_item.ci_parent);
 570         struct node *nd;
 571
 572         nd = kzalloc(sizeof(struct node), GFP_KERNEL);
 573         if (!nd)
 574                 return -ENOMEM;
 575
 576         config_item_init_type_name(&nd->item, name, &node_type);
 577         nd->nodeid = -1;
 578         nd->weight = 1;  /* default weight of 1 if none is set */
 579         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 580
 581         mutex_lock(&sp->members_lock);
 582         list_add(&nd->list, &sp->members);
 583         sp->members_count++;
 584         mutex_unlock(&sp->members_lock);
 585
 586         *new_i = &nd->item;
 587         return 0;
 588 }
 589
 590 static void drop_node(struct config_group *g, struct config_item *i)
 591 {
 592         struct space *sp = to_space(g->cg_item.ci_parent);
 593         struct node *nd = to_node(i);
 594
 595         mutex_lock(&sp->members_lock);
 596         list_del(&nd->list);
 597         sp->members_count--;
 598         mutex_unlock(&sp->members_lock);
 599
 600         config_item_put(i);
 601 }
 602
 603 static void release_node(struct config_item *i)
 604 {
 605         struct node *nd = to_node(i);
 606         kfree(nd);
 607 }
 608
 609 static struct clusters clusters_root = {
 610         .subsys = {
 611                 .su_group = {
 612                         .cg_item = {
 613                                 .ci_namebuf = "dlm",
 614                                 .ci_type = &clusters_type,
 615                         },
 616                 },
 617         },
 618 };
 619
 620 int __init dlm_config_init(void)
 621 {
 622         config_group_init(&clusters_root.subsys.su_group);
 623         mutex_init(&clusters_root.subsys.su_mutex);
 624         return configfs_register_subsystem(&clusters_root.subsys);
 625 }
 626
 627 void dlm_config_exit(void)
 628 {
 629         configfs_unregister_subsystem(&clusters_root.subsys);
 630 }
 631
 632 /*
 633  * Functions for user space to read/write attributes
 634  */
 635
 636 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 637                             char *buf)
 638 {
 639         struct cluster *cl = to_cluster(i);
 640         struct cluster_attribute *cla =
 641                         container_of(a, struct cluster_attribute, attr);
 642         return cla->show ? cla->show(cl, buf) : 0;
 643 }
 644
 645 static ssize_t store_cluster(struct config_item *i,
 646                              struct configfs_attribute *a,
 647                              const char *buf, size_t len)
 648 {
 649         struct cluster *cl = to_cluster(i);
 650         struct cluster_attribute *cla =
 651                 container_of(a, struct cluster_attribute, attr);
 652         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 653 }
 654
 655 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 656                          char *buf)
 657 {
 658         struct comm *cm = to_comm(i);
 659         struct comm_attribute *cma =
 660                         container_of(a, struct comm_attribute, attr);
 661         return cma->show ? cma->show(cm, buf) : 0;
 662 }
 663
 664 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 665                           const char *buf, size_t len)
 666 {
 667         struct comm *cm = to_comm(i);
 668         struct comm_attribute *cma =
 669                 container_of(a, struct comm_attribute, attr);
 670         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 671 }
 672
 673 static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
 674 {
 675         return sprintf(buf, "%d\n", cm->nodeid);
 676 }
 677
 678 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len)
 679 {
 680         cm->nodeid = simple_strtol(buf, NULL, 0);
 681         return len;
 682 }
 683
 684 static ssize_t comm_local_read(struct comm *cm, char *buf)
 685 {
 686         return sprintf(buf, "%d\n", cm->local);
 687 }
 688
 689 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
 690 {
 691         cm->local= simple_strtol(buf, NULL, 0);
 692         if (cm->local && !local_comm)
 693                 local_comm = cm;
 694         return len;
 695 }
 696
 697 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
 698 {
 699         struct sockaddr_storage *addr;
 700
 701         if (len != sizeof(struct sockaddr_storage))
 702                 return -EINVAL;
 703
 704         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 705                 return -ENOSPC;
 706
 707         addr = kzalloc(sizeof(*addr), GFP_KERNEL);
 708         if (!addr)
 709                 return -ENOMEM;
 710
 711         memcpy(addr, buf, len);
 712         cm->addr[cm->addr_count++] = addr;
 713         return len;
 714 }
 715
 716 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 717                          char *buf)
 718 {
 719         struct node *nd = to_node(i);
 720         struct node_attribute *nda =
 721                         container_of(a, struct node_attribute, attr);
 722         return nda->show ? nda->show(nd, buf) : 0;
 723 }
 724
 725 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 726                           const char *buf, size_t len)
 727 {
 728         struct node *nd = to_node(i);
 729         struct node_attribute *nda =
 730                 container_of(a, struct node_attribute, attr);
 731         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 732 }
 733
 734 static ssize_t node_nodeid_read(struct node *nd, char *buf)
 735 {
 736         return sprintf(buf, "%d\n", nd->nodeid);
 737 }
 738
 739 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
 740 {
 741         nd->nodeid = simple_strtol(buf, NULL, 0);
 742         return len;
 743 }
 744
 745 static ssize_t node_weight_read(struct node *nd, char *buf)
 746 {
 747         return sprintf(buf, "%d\n", nd->weight);
 748 }
 749
 750 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
 751 {
 752         nd->weight = simple_strtol(buf, NULL, 0);
 753         return len;
 754 }
 755
 756 /*
 757  * Functions for the dlm to get the info that's been configured
 758  */
 759
 760 static struct space *get_space(char *name)
 761 {
 762         struct config_item *i;
 763
 764         if (!space_list)
 765                 return NULL;
 766
 767         mutex_lock(&space_list->cg_subsys->su_mutex);
 768         i = config_group_find_item(space_list, name);
 769         mutex_unlock(&space_list->cg_subsys->su_mutex);
 770
 771         return to_space(i);
 772 }
 773
 774 static void put_space(struct space *sp)
 775 {
 776         config_item_put(&sp->group.cg_item);
 777 }
 778
 779 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 780 {
 781         struct config_item *i;
 782         struct comm *cm = NULL;
 783         int found = 0;
 784
 785         if (!comm_list)
 786                 return NULL;
 787
 788         mutex_lock(&clusters_root.subsys.su_mutex);
 789
 790         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 791                 cm = to_comm(i);
 792
 793                 if (nodeid) {
 794                         if (cm->nodeid != nodeid)
 795                                 continue;
 796                         found = 1;
 797                         config_item_get(i);
 798                         break;
 799                 } else {
 800                         if (!cm->addr_count ||
 801                             memcmp(cm->addr[0], addr, sizeof(*addr)))
 802                                 continue;
 803                         found = 1;
 804                         config_item_get(i);
 805                         break;
 806                 }
 807         }
 808         mutex_unlock(&clusters_root.subsys.su_mutex);
 809
 810         if (!found)
 811                 cm = NULL;
 812         return cm;
 813 }
 814
 815 static void put_comm(struct comm *cm)
 816 {
 817         config_item_put(&cm->item);
 818 }
 819
 820 /* caller must free mem */
 821 int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
 822                     int **new_out, int *new_count_out)
 823 {
 824         struct space *sp;
 825         struct node *nd;
 826         int i = 0, rv = 0, ids_count = 0, new_count = 0;
 827         int *ids, *new;
 828
 829         sp = get_space(lsname);
 830         if (!sp)
 831                 return -EEXIST;
 832
 833         mutex_lock(&sp->members_lock);
 834         if (!sp->members_count) {
 835                 rv = -EINVAL;
 836                 printk(KERN_ERR "dlm: zero members_count\n");
 837                 goto out;
 838         }
 839
 840         ids_count = sp->members_count;
 841
 842         ids = kcalloc(ids_count, sizeof(int), GFP_KERNEL);
 843         if (!ids) {
 844                 rv = -ENOMEM;
 845                 goto out;
 846         }
 847
 848         list_for_each_entry(nd, &sp->members, list) {
 849                 ids[i++] = nd->nodeid;
 850                 if (nd->new)
 851                         new_count++;
 852         }
 853
 854         if (ids_count != i)
 855                 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i);
 856
 857         if (!new_count)
 858                 goto out_ids;
 859
 860         new = kcalloc(new_count, sizeof(int), GFP_KERNEL);
 861         if (!new) {
 862                 kfree(ids);
 863                 rv = -ENOMEM;
 864                 goto out;
 865         }
 866
 867         i = 0;
 868         list_for_each_entry(nd, &sp->members, list) {
 869                 if (nd->new) {
 870                         new[i++] = nd->nodeid;
 871                         nd->new = 0;
 872                 }
 873         }
 874         *new_count_out = new_count;
 875         *new_out = new;
 876
 877  out_ids:
 878         *ids_count_out = ids_count;
 879         *ids_out = ids;
 880  out:
 881         mutex_unlock(&sp->members_lock);
 882         put_space(sp);
 883         return rv;
 884 }
 885
 886 int dlm_node_weight(char *lsname, int nodeid)
 887 {
 888         struct space *sp;
 889         struct node *nd;
 890         int w = -EEXIST;
 891
 892         sp = get_space(lsname);
 893         if (!sp)
 894                 goto out;
 895
 896         mutex_lock(&sp->members_lock);
 897         list_for_each_entry(nd, &sp->members, list) {
 898                 if (nd->nodeid != nodeid)
 899                         continue;
 900                 w = nd->weight;
 901                 break;
 902         }
 903         mutex_unlock(&sp->members_lock);
 904         put_space(sp);
 905  out:
 906         return w;
 907 }
 908
 909 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
 910 {
 911         struct comm *cm = get_comm(nodeid, NULL);
 912         if (!cm)
 913                 return -EEXIST;
 914         if (!cm->addr_count)
 915                 return -ENOENT;
 916         memcpy(addr, cm->addr[0], sizeof(*addr));
 917         put_comm(cm);
 918         return 0;
 919 }
 920
 921 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
 922 {
 923         struct comm *cm = get_comm(0, addr);
 924         if (!cm)
 925                 return -EEXIST;
 926         *nodeid = cm->nodeid;
 927         put_comm(cm);
 928         return 0;
 929 }
 930
 931 int dlm_our_nodeid(void)
 932 {
 933         return local_comm ? local_comm->nodeid : 0;
 934 }
 935
 936 /* num 0 is first addr, num 1 is second addr */
 937 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 938 {
 939         if (!local_comm)
 940                 return -1;
 941         if (num + 1 > local_comm->addr_count)
 942                 return -1;
 943         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 944         return 0;
 945 }
 946
 947 /* Config file defaults */
 948 #define DEFAULT_TCP_PORT       21064
 949 #define DEFAULT_BUFFER_SIZE     4096
 950 #define DEFAULT_RSBTBL_SIZE      256
 951 #define DEFAULT_LKBTBL_SIZE     1024
 952 #define DEFAULT_DIRTBL_SIZE      512
 953 #define DEFAULT_RECOVER_TIMER      5
 954 #define DEFAULT_TOSS_SECS         10
 955 #define DEFAULT_SCAN_SECS          5
 956 #define DEFAULT_LOG_DEBUG          0
 957 #define DEFAULT_PROTOCOL           0
 958 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 959
 960 struct dlm_config_info dlm_config = {
 961         .ci_tcp_port = DEFAULT_TCP_PORT,
 962         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 963         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 964         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
 965         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
 966         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 967         .ci_toss_secs = DEFAULT_TOSS_SECS,
 968         .ci_scan_secs = DEFAULT_SCAN_SECS,
 969         .ci_log_debug = DEFAULT_LOG_DEBUG,
 970         .ci_protocol = DEFAULT_PROTOCOL,
 971         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
 972 };
 973