fs/dlm/config.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   6 **
   7 **  This copyrighted material is made available to anyone wishing to use,
   8 **  modify, copy, or redistribute it subject to the terms and conditions
   9 **  of the GNU General Public License v.2.
  10 **
  11 *******************************************************************************
  12 ******************************************************************************/
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/configfs.h>
  17 #include <net/sock.h>
  18
  19 #include "config.h"
  20 #include "lowcomms.h"
  21
  22 /*
  23  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  24  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  25  * /config/dlm/<cluster>/comms/<comm>/nodeid
  26  * /config/dlm/<cluster>/comms/<comm>/local
  27  * /config/dlm/<cluster>/comms/<comm>/addr
  28  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  29  */
  30
  31 static struct config_group *space_list;
  32 static struct config_group *comm_list;
  33 static struct comm *local_comm;
  34
  35 struct clusters;
  36 struct cluster;
  37 struct spaces;
  38 struct space;
  39 struct comms;
  40 struct comm;
  41 struct nodes;
  42 struct node;
  43
  44 static struct config_group *make_cluster(struct config_group *, const char *);
  45 static void drop_cluster(struct config_group *, struct config_item *);
  46 static void release_cluster(struct config_item *);
  47 static struct config_group *make_space(struct config_group *, const char *);
  48 static void drop_space(struct config_group *, struct config_item *);
  49 static void release_space(struct config_item *);
  50 static struct config_item *make_comm(struct config_group *, const char *);
  51 static void drop_comm(struct config_group *, struct config_item *);
  52 static void release_comm(struct config_item *);
  53 static struct config_item *make_node(struct config_group *, const char *);
  54 static void drop_node(struct config_group *, struct config_item *);
  55 static void release_node(struct config_item *);
  56
  57 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
  58                             char *buf);
  59 static ssize_t store_cluster(struct config_item *i,
  60                              struct configfs_attribute *a,
  61                              const char *buf, size_t len);
  62 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
  63                          char *buf);
  64 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
  65                           const char *buf, size_t len);
  66 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
  67                          char *buf);
  68 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
  69                           const char *buf, size_t len);
  70
  71 static ssize_t comm_nodeid_read(struct comm *cm, char *buf);
  72 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len);
  73 static ssize_t comm_local_read(struct comm *cm, char *buf);
  74 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len);
  75 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len);
  76 static ssize_t node_nodeid_read(struct node *nd, char *buf);
  77 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len);
  78 static ssize_t node_weight_read(struct node *nd, char *buf);
  79 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len);
  80
  81 struct cluster {
  82         struct config_group group;
  83         unsigned int cl_tcp_port;
  84         unsigned int cl_buffer_size;
  85         unsigned int cl_rsbtbl_size;
  86         unsigned int cl_lkbtbl_size;
  87         unsigned int cl_dirtbl_size;
  88         unsigned int cl_recover_timer;
  89         unsigned int cl_toss_secs;
  90         unsigned int cl_scan_secs;
  91         unsigned int cl_log_debug;
  92         unsigned int cl_protocol;
  93         unsigned int cl_timewarn_cs;
  94 };
  95
  96 enum {
  97         CLUSTER_ATTR_TCP_PORT = 0,
  98         CLUSTER_ATTR_BUFFER_SIZE,
  99         CLUSTER_ATTR_RSBTBL_SIZE,
 100         CLUSTER_ATTR_LKBTBL_SIZE,
 101         CLUSTER_ATTR_DIRTBL_SIZE,
 102         CLUSTER_ATTR_RECOVER_TIMER,
 103         CLUSTER_ATTR_TOSS_SECS,
 104         CLUSTER_ATTR_SCAN_SECS,
 105         CLUSTER_ATTR_LOG_DEBUG,
 106         CLUSTER_ATTR_PROTOCOL,
 107         CLUSTER_ATTR_TIMEWARN_CS,
 108 };
 109
 110 struct cluster_attribute {
 111         struct configfs_attribute attr;
 112         ssize_t (*show)(struct cluster *, char *);
 113         ssize_t (*store)(struct cluster *, const char *, size_t);
 114 };
 115
 116 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
 117                            unsigned int *info_field, int check_zero,
 118                            const char *buf, size_t len)
 119 {
 120         unsigned int x;
 121
 122         if (!capable(CAP_SYS_ADMIN))
 123                 return -EACCES;
 124
 125         x = simple_strtoul(buf, NULL, 0);
 126
 127         if (check_zero && !x)
 128                 return -EINVAL;
 129
 130         *cl_field = x;
 131         *info_field = x;
 132
 133         return len;
 134 }
 135
 136 #define CLUSTER_ATTR(name, check_zero)                                        \
 137 static ssize_t name##_write(struct cluster *cl, const char *buf, size_t len)  \
 138 {                                                                             \
 139         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 140                            check_zero, buf, len);                             \
 141 }                                                                             \
 142 static ssize_t name##_read(struct cluster *cl, char *buf)                     \
 143 {                                                                             \
 144         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 145 }                                                                             \
 146 static struct cluster_attribute cluster_attr_##name =                         \
 147 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
 148
 149 CLUSTER_ATTR(tcp_port, 1);
 150 CLUSTER_ATTR(buffer_size, 1);
 151 CLUSTER_ATTR(rsbtbl_size, 1);
 152 CLUSTER_ATTR(lkbtbl_size, 1);
 153 CLUSTER_ATTR(dirtbl_size, 1);
 154 CLUSTER_ATTR(recover_timer, 1);
 155 CLUSTER_ATTR(toss_secs, 1);
 156 CLUSTER_ATTR(scan_secs, 1);
 157 CLUSTER_ATTR(log_debug, 0);
 158 CLUSTER_ATTR(protocol, 0);
 159 CLUSTER_ATTR(timewarn_cs, 1);
 160
 161 static struct configfs_attribute *cluster_attrs[] = {
 162         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
 163         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
 164         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
 165         [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
 166         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
 167         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
 168         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
 169         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
 170         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
 171         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
 172         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
 173         NULL,
 174 };
 175
 176 enum {
 177         COMM_ATTR_NODEID = 0,
 178         COMM_ATTR_LOCAL,
 179         COMM_ATTR_ADDR,
 180 };
 181
 182 struct comm_attribute {
 183         struct configfs_attribute attr;
 184         ssize_t (*show)(struct comm *, char *);
 185         ssize_t (*store)(struct comm *, const char *, size_t);
 186 };
 187
 188 static struct comm_attribute comm_attr_nodeid = {
 189         .attr   = { .ca_owner = THIS_MODULE,
 190                     .ca_name = "nodeid",
 191                     .ca_mode = S_IRUGO | S_IWUSR },
 192         .show   = comm_nodeid_read,
 193         .store  = comm_nodeid_write,
 194 };
 195
 196 static struct comm_attribute comm_attr_local = {
 197         .attr   = { .ca_owner = THIS_MODULE,
 198                     .ca_name = "local",
 199                     .ca_mode = S_IRUGO | S_IWUSR },
 200         .show   = comm_local_read,
 201         .store  = comm_local_write,
 202 };
 203
 204 static struct comm_attribute comm_attr_addr = {
 205         .attr   = { .ca_owner = THIS_MODULE,
 206                     .ca_name = "addr",
 207                     .ca_mode = S_IRUGO | S_IWUSR },
 208         .store  = comm_addr_write,
 209 };
 210
 211 static struct configfs_attribute *comm_attrs[] = {
 212         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
 213         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
 214         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
 215         NULL,
 216 };
 217
 218 enum {
 219         NODE_ATTR_NODEID = 0,
 220         NODE_ATTR_WEIGHT,
 221 };
 222
 223 struct node_attribute {
 224         struct configfs_attribute attr;
 225         ssize_t (*show)(struct node *, char *);
 226         ssize_t (*store)(struct node *, const char *, size_t);
 227 };
 228
 229 static struct node_attribute node_attr_nodeid = {
 230         .attr   = { .ca_owner = THIS_MODULE,
 231                     .ca_name = "nodeid",
 232                     .ca_mode = S_IRUGO | S_IWUSR },
 233         .show   = node_nodeid_read,
 234         .store  = node_nodeid_write,
 235 };
 236
 237 static struct node_attribute node_attr_weight = {
 238         .attr   = { .ca_owner = THIS_MODULE,
 239                     .ca_name = "weight",
 240                     .ca_mode = S_IRUGO | S_IWUSR },
 241         .show   = node_weight_read,
 242         .store  = node_weight_write,
 243 };
 244
 245 static struct configfs_attribute *node_attrs[] = {
 246         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
 247         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
 248         NULL,
 249 };
 250
 251 struct clusters {
 252         struct configfs_subsystem subsys;
 253 };
 254
 255 struct spaces {
 256         struct config_group ss_group;
 257 };
 258
 259 struct space {
 260         struct config_group group;
 261         struct list_head members;
 262         struct mutex members_lock;
 263         int members_count;
 264 };
 265
 266 struct comms {
 267         struct config_group cs_group;
 268 };
 269
 270 struct comm {
 271         struct config_item item;
 272         int nodeid;
 273         int local;
 274         int addr_count;
 275         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 276 };
 277
 278 struct nodes {
 279         struct config_group ns_group;
 280 };
 281
 282 struct node {
 283         struct config_item item;
 284         struct list_head list; /* space->members */
 285         int nodeid;
 286         int weight;
 287 };
 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         cl->cl_protocol = dlm_config.ci_protocol;
 429         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 430
 431         space_list = &sps->ss_group;
 432         comm_list = &cms->cs_group;
 433         return &cl->group;
 434
 435  fail:
 436         kfree(cl);
 437         kfree(gps);
 438         kfree(sps);
 439         kfree(cms);
 440         return NULL;
 441 }
 442
 443 static void drop_cluster(struct config_group *g, struct config_item *i)
 444 {
 445         struct cluster *cl = to_cluster(i);
 446         struct config_item *tmp;
 447         int j;
 448
 449         for (j = 0; cl->group.default_groups[j]; j++) {
 450                 tmp = &cl->group.default_groups[j]->cg_item;
 451                 cl->group.default_groups[j] = NULL;
 452                 config_item_put(tmp);
 453         }
 454
 455         space_list = NULL;
 456         comm_list = NULL;
 457
 458         config_item_put(i);
 459 }
 460
 461 static void release_cluster(struct config_item *i)
 462 {
 463         struct cluster *cl = to_cluster(i);
 464         kfree(cl->group.default_groups);
 465         kfree(cl);
 466 }
 467
 468 static struct config_group *make_space(struct config_group *g, const char *name)
 469 {
 470         struct space *sp = NULL;
 471         struct nodes *nds = NULL;
 472         void *gps = NULL;
 473
 474         sp = kzalloc(sizeof(struct space), GFP_KERNEL);
 475         gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL);
 476         nds = kzalloc(sizeof(struct nodes), GFP_KERNEL);
 477
 478         if (!sp || !gps || !nds)
 479                 goto fail;
 480
 481         config_group_init_type_name(&sp->group, name, &space_type);
 482         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 483
 484         sp->group.default_groups = gps;
 485         sp->group.default_groups[0] = &nds->ns_group;
 486         sp->group.default_groups[1] = NULL;
 487
 488         INIT_LIST_HEAD(&sp->members);
 489         mutex_init(&sp->members_lock);
 490         sp->members_count = 0;
 491         return &sp->group;
 492
 493  fail:
 494         kfree(sp);
 495         kfree(gps);
 496         kfree(nds);
 497         return NULL;
 498 }
 499
 500 static void drop_space(struct config_group *g, struct config_item *i)
 501 {
 502         struct space *sp = to_space(i);
 503         struct config_item *tmp;
 504         int j;
 505
 506         /* assert list_empty(&sp->members) */
 507
 508         for (j = 0; sp->group.default_groups[j]; j++) {
 509                 tmp = &sp->group.default_groups[j]->cg_item;
 510                 sp->group.default_groups[j] = NULL;
 511                 config_item_put(tmp);
 512         }
 513
 514         config_item_put(i);
 515 }
 516
 517 static void release_space(struct config_item *i)
 518 {
 519         struct space *sp = to_space(i);
 520         kfree(sp->group.default_groups);
 521         kfree(sp);
 522 }
 523
 524 static struct config_item *make_comm(struct config_group *g, const char *name)
 525 {
 526         struct comm *cm;
 527
 528         cm = kzalloc(sizeof(struct comm), GFP_KERNEL);
 529         if (!cm)
 530                 return NULL;
 531
 532         config_item_init_type_name(&cm->item, name, &comm_type);
 533         cm->nodeid = -1;
 534         cm->local = 0;
 535         cm->addr_count = 0;
 536         return &cm->item;
 537 }
 538
 539 static void drop_comm(struct config_group *g, struct config_item *i)
 540 {
 541         struct comm *cm = to_comm(i);
 542         if (local_comm == cm)
 543                 local_comm = NULL;
 544         dlm_lowcomms_close(cm->nodeid);
 545         while (cm->addr_count--)
 546                 kfree(cm->addr[cm->addr_count]);
 547         config_item_put(i);
 548 }
 549
 550 static void release_comm(struct config_item *i)
 551 {
 552         struct comm *cm = to_comm(i);
 553         kfree(cm);
 554 }
 555
 556 static struct config_item *make_node(struct config_group *g, const char *name)
 557 {
 558         struct space *sp = to_space(g->cg_item.ci_parent);
 559         struct node *nd;
 560
 561         nd = kzalloc(sizeof(struct node), GFP_KERNEL);
 562         if (!nd)
 563                 return NULL;
 564
 565         config_item_init_type_name(&nd->item, name, &node_type);
 566         nd->nodeid = -1;
 567         nd->weight = 1;  /* default weight of 1 if none is set */
 568
 569         mutex_lock(&sp->members_lock);
 570         list_add(&nd->list, &sp->members);
 571         sp->members_count++;
 572         mutex_unlock(&sp->members_lock);
 573
 574         return &nd->item;
 575 }
 576
 577 static void drop_node(struct config_group *g, struct config_item *i)
 578 {
 579         struct space *sp = to_space(g->cg_item.ci_parent);
 580         struct node *nd = to_node(i);
 581
 582         mutex_lock(&sp->members_lock);
 583         list_del(&nd->list);
 584         sp->members_count--;
 585         mutex_unlock(&sp->members_lock);
 586
 587         config_item_put(i);
 588 }
 589
 590 static void release_node(struct config_item *i)
 591 {
 592         struct node *nd = to_node(i);
 593         kfree(nd);
 594 }
 595
 596 static struct clusters clusters_root = {
 597         .subsys = {
 598                 .su_group = {
 599                         .cg_item = {
 600                                 .ci_namebuf = "dlm",
 601                                 .ci_type = &clusters_type,
 602                         },
 603                 },
 604         },
 605 };
 606
 607 int dlm_config_init(void)
 608 {
 609         config_group_init(&clusters_root.subsys.su_group);
 610         mutex_init(&clusters_root.subsys.su_mutex);
 611         return configfs_register_subsystem(&clusters_root.subsys);
 612 }
 613
 614 void dlm_config_exit(void)
 615 {
 616         configfs_unregister_subsystem(&clusters_root.subsys);
 617 }
 618
 619 /*
 620  * Functions for user space to read/write attributes
 621  */
 622
 623 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 624                             char *buf)
 625 {
 626         struct cluster *cl = to_cluster(i);
 627         struct cluster_attribute *cla =
 628                         container_of(a, struct cluster_attribute, attr);
 629         return cla->show ? cla->show(cl, buf) : 0;
 630 }
 631
 632 static ssize_t store_cluster(struct config_item *i,
 633                              struct configfs_attribute *a,
 634                              const char *buf, size_t len)
 635 {
 636         struct cluster *cl = to_cluster(i);
 637         struct cluster_attribute *cla =
 638                 container_of(a, struct cluster_attribute, attr);
 639         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 640 }
 641
 642 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 643                          char *buf)
 644 {
 645         struct comm *cm = to_comm(i);
 646         struct comm_attribute *cma =
 647                         container_of(a, struct comm_attribute, attr);
 648         return cma->show ? cma->show(cm, buf) : 0;
 649 }
 650
 651 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 652                           const char *buf, size_t len)
 653 {
 654         struct comm *cm = to_comm(i);
 655         struct comm_attribute *cma =
 656                 container_of(a, struct comm_attribute, attr);
 657         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 658 }
 659
 660 static ssize_t comm_nodeid_read(struct comm *cm, char *buf)
 661 {
 662         return sprintf(buf, "%d\n", cm->nodeid);
 663 }
 664
 665 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len)
 666 {
 667         cm->nodeid = simple_strtol(buf, NULL, 0);
 668         return len;
 669 }
 670
 671 static ssize_t comm_local_read(struct comm *cm, char *buf)
 672 {
 673         return sprintf(buf, "%d\n", cm->local);
 674 }
 675
 676 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len)
 677 {
 678         cm->local= simple_strtol(buf, NULL, 0);
 679         if (cm->local && !local_comm)
 680                 local_comm = cm;
 681         return len;
 682 }
 683
 684 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len)
 685 {
 686         struct sockaddr_storage *addr;
 687
 688         if (len != sizeof(struct sockaddr_storage))
 689                 return -EINVAL;
 690
 691         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 692                 return -ENOSPC;
 693
 694         addr = kzalloc(sizeof(*addr), GFP_KERNEL);
 695         if (!addr)
 696                 return -ENOMEM;
 697
 698         memcpy(addr, buf, len);
 699         cm->addr[cm->addr_count++] = addr;
 700         return len;
 701 }
 702
 703 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 704                          char *buf)
 705 {
 706         struct node *nd = to_node(i);
 707         struct node_attribute *nda =
 708                         container_of(a, struct node_attribute, attr);
 709         return nda->show ? nda->show(nd, buf) : 0;
 710 }
 711
 712 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 713                           const char *buf, size_t len)
 714 {
 715         struct node *nd = to_node(i);
 716         struct node_attribute *nda =
 717                 container_of(a, struct node_attribute, attr);
 718         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 719 }
 720
 721 static ssize_t node_nodeid_read(struct node *nd, char *buf)
 722 {
 723         return sprintf(buf, "%d\n", nd->nodeid);
 724 }
 725
 726 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len)
 727 {
 728         nd->nodeid = simple_strtol(buf, NULL, 0);
 729         return len;
 730 }
 731
 732 static ssize_t node_weight_read(struct node *nd, char *buf)
 733 {
 734         return sprintf(buf, "%d\n", nd->weight);
 735 }
 736
 737 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len)
 738 {
 739         nd->weight = simple_strtol(buf, NULL, 0);
 740         return len;
 741 }
 742
 743 /*
 744  * Functions for the dlm to get the info that's been configured
 745  */
 746
 747 static struct space *get_space(char *name)
 748 {
 749         struct config_item *i;
 750
 751         if (!space_list)
 752                 return NULL;
 753
 754         mutex_lock(&space_list->cg_subsys->su_mutex);
 755         i = config_group_find_item(space_list, name);
 756         mutex_unlock(&space_list->cg_subsys->su_mutex);
 757
 758         return to_space(i);
 759 }
 760
 761 static void put_space(struct space *sp)
 762 {
 763         config_item_put(&sp->group.cg_item);
 764 }
 765
 766 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 767 {
 768         struct config_item *i;
 769         struct comm *cm = NULL;
 770         int found = 0;
 771
 772         if (!comm_list)
 773                 return NULL;
 774
 775         mutex_lock(&clusters_root.subsys.su_mutex);
 776
 777         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 778                 cm = to_comm(i);
 779
 780                 if (nodeid) {
 781                         if (cm->nodeid != nodeid)
 782                                 continue;
 783                         found = 1;
 784                         config_item_get(i);
 785                         break;
 786                 } else {
 787                         if (!cm->addr_count ||
 788                             memcmp(cm->addr[0], addr, sizeof(*addr)))
 789                                 continue;
 790                         found = 1;
 791                         config_item_get(i);
 792                         break;
 793                 }
 794         }
 795         mutex_unlock(&clusters_root.subsys.su_mutex);
 796
 797         if (!found)
 798                 cm = NULL;
 799         return cm;
 800 }
 801
 802 static void put_comm(struct comm *cm)
 803 {
 804         config_item_put(&cm->item);
 805 }
 806
 807 /* caller must free mem */
 808 int dlm_nodeid_list(char *lsname, int **ids_out)
 809 {
 810         struct space *sp;
 811         struct node *nd;
 812         int i = 0, rv = 0;
 813         int *ids;
 814
 815         sp = get_space(lsname);
 816         if (!sp)
 817                 return -EEXIST;
 818
 819         mutex_lock(&sp->members_lock);
 820         if (!sp->members_count) {
 821                 rv = 0;
 822                 goto out;
 823         }
 824
 825         ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL);
 826         if (!ids) {
 827                 rv = -ENOMEM;
 828                 goto out;
 829         }
 830
 831         rv = sp->members_count;
 832         list_for_each_entry(nd, &sp->members, list)
 833                 ids[i++] = nd->nodeid;
 834
 835         if (rv != i)
 836                 printk("bad nodeid count %d %d\n", rv, i);
 837
 838         *ids_out = ids;
 839  out:
 840         mutex_unlock(&sp->members_lock);
 841         put_space(sp);
 842         return rv;
 843 }
 844
 845 int dlm_node_weight(char *lsname, int nodeid)
 846 {
 847         struct space *sp;
 848         struct node *nd;
 849         int w = -EEXIST;
 850
 851         sp = get_space(lsname);
 852         if (!sp)
 853                 goto out;
 854
 855         mutex_lock(&sp->members_lock);
 856         list_for_each_entry(nd, &sp->members, list) {
 857                 if (nd->nodeid != nodeid)
 858                         continue;
 859                 w = nd->weight;
 860                 break;
 861         }
 862         mutex_unlock(&sp->members_lock);
 863         put_space(sp);
 864  out:
 865         return w;
 866 }
 867
 868 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
 869 {
 870         struct comm *cm = get_comm(nodeid, NULL);
 871         if (!cm)
 872                 return -EEXIST;
 873         if (!cm->addr_count)
 874                 return -ENOENT;
 875         memcpy(addr, cm->addr[0], sizeof(*addr));
 876         put_comm(cm);
 877         return 0;
 878 }
 879
 880 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
 881 {
 882         struct comm *cm = get_comm(0, addr);
 883         if (!cm)
 884                 return -EEXIST;
 885         *nodeid = cm->nodeid;
 886         put_comm(cm);
 887         return 0;
 888 }
 889
 890 int dlm_our_nodeid(void)
 891 {
 892         return local_comm ? local_comm->nodeid : 0;
 893 }
 894
 895 /* num 0 is first addr, num 1 is second addr */
 896 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 897 {
 898         if (!local_comm)
 899                 return -1;
 900         if (num + 1 > local_comm->addr_count)
 901                 return -1;
 902         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 903         return 0;
 904 }
 905
 906 /* Config file defaults */
 907 #define DEFAULT_TCP_PORT       21064
 908 #define DEFAULT_BUFFER_SIZE     4096
 909 #define DEFAULT_RSBTBL_SIZE      256
 910 #define DEFAULT_LKBTBL_SIZE     1024
 911 #define DEFAULT_DIRTBL_SIZE      512
 912 #define DEFAULT_RECOVER_TIMER      5
 913 #define DEFAULT_TOSS_SECS         10
 914 #define DEFAULT_SCAN_SECS          5
 915 #define DEFAULT_LOG_DEBUG          0
 916 #define DEFAULT_PROTOCOL           0
 917 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 918
 919 struct dlm_config_info dlm_config = {
 920         .ci_tcp_port = DEFAULT_TCP_PORT,
 921         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 922         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 923         .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE,
 924         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
 925         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 926         .ci_toss_secs = DEFAULT_TOSS_SECS,
 927         .ci_scan_secs = DEFAULT_SCAN_SECS,
 928         .ci_log_debug = DEFAULT_LOG_DEBUG,
 929         .ci_protocol = DEFAULT_PROTOCOL,
 930         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS
 931 };
 932