fs/dlm/config.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2011 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 <linux/slab.h>
  18 #include <linux/in.h>
  19 #include <linux/in6.h>
  20 #include <linux/dlmconstants.h>
  21 #include <net/ipv6.h>
  22 #include <net/sock.h>
  23
  24 #include "config.h"
  25 #include "lowcomms.h"
  26
  27 /*
  28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  29  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  30  * /config/dlm/<cluster>/comms/<comm>/nodeid
  31  * /config/dlm/<cluster>/comms/<comm>/local
  32  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  33  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  34  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  35  */
  36
  37 static struct config_group *space_list;
  38 static struct config_group *comm_list;
  39 static struct dlm_comm *local_comm;
  40 static uint32_t dlm_comm_count;
  41
  42 struct dlm_clusters;
  43 struct dlm_cluster;
  44 struct dlm_spaces;
  45 struct dlm_space;
  46 struct dlm_comms;
  47 struct dlm_comm;
  48 struct dlm_nodes;
  49 struct dlm_node;
  50
  51 static struct config_group *make_cluster(struct config_group *, const char *);
  52 static void drop_cluster(struct config_group *, struct config_item *);
  53 static void release_cluster(struct config_item *);
  54 static struct config_group *make_space(struct config_group *, const char *);
  55 static void drop_space(struct config_group *, struct config_item *);
  56 static void release_space(struct config_item *);
  57 static struct config_item *make_comm(struct config_group *, const char *);
  58 static void drop_comm(struct config_group *, struct config_item *);
  59 static void release_comm(struct config_item *);
  60 static struct config_item *make_node(struct config_group *, const char *);
  61 static void drop_node(struct config_group *, struct config_item *);
  62 static void release_node(struct config_item *);
  63
  64 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
  65                             char *buf);
  66 static ssize_t store_cluster(struct config_item *i,
  67                              struct configfs_attribute *a,
  68                              const char *buf, size_t len);
  69 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
  70                          char *buf);
  71 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
  72                           const char *buf, size_t len);
  73 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
  74                          char *buf);
  75 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
  76                           const char *buf, size_t len);
  77
  78 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
  79 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
  80                                 size_t len);
  81 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
  82 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
  83                                 size_t len);
  84 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
  85                                 size_t len);
  86 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
  87 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
  88 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
  89                                 size_t len);
  90 static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
  91 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
  92                                 size_t len);
  93
  94 struct dlm_cluster {
  95         struct config_group group;
  96         unsigned int cl_tcp_port;
  97         unsigned int cl_buffer_size;
  98         unsigned int cl_rsbtbl_size;
  99         unsigned int cl_dirtbl_size;
 100         unsigned int cl_recover_timer;
 101         unsigned int cl_toss_secs;
 102         unsigned int cl_scan_secs;
 103         unsigned int cl_log_debug;
 104         unsigned int cl_protocol;
 105         unsigned int cl_timewarn_cs;
 106         unsigned int cl_waitwarn_us;
 107         unsigned int cl_new_rsb_count;
 108         unsigned int cl_recover_callbacks;
 109         char cl_cluster_name[DLM_LOCKSPACE_LEN];
 110 };
 111
 112 enum {
 113         CLUSTER_ATTR_TCP_PORT = 0,
 114         CLUSTER_ATTR_BUFFER_SIZE,
 115         CLUSTER_ATTR_RSBTBL_SIZE,
 116         CLUSTER_ATTR_DIRTBL_SIZE,
 117         CLUSTER_ATTR_RECOVER_TIMER,
 118         CLUSTER_ATTR_TOSS_SECS,
 119         CLUSTER_ATTR_SCAN_SECS,
 120         CLUSTER_ATTR_LOG_DEBUG,
 121         CLUSTER_ATTR_PROTOCOL,
 122         CLUSTER_ATTR_TIMEWARN_CS,
 123         CLUSTER_ATTR_WAITWARN_US,
 124         CLUSTER_ATTR_NEW_RSB_COUNT,
 125         CLUSTER_ATTR_RECOVER_CALLBACKS,
 126         CLUSTER_ATTR_CLUSTER_NAME,
 127 };
 128
 129 struct cluster_attribute {
 130         struct configfs_attribute attr;
 131         ssize_t (*show)(struct dlm_cluster *, char *);
 132         ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
 133 };
 134
 135 static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf)
 136 {
 137         return sprintf(buf, "%s\n", cl->cl_cluster_name);
 138 }
 139
 140 static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl,
 141                                           const char *buf, size_t len)
 142 {
 143         strncpy(dlm_config.ci_cluster_name, buf, DLM_LOCKSPACE_LEN);
 144         strncpy(cl->cl_cluster_name, buf, DLM_LOCKSPACE_LEN);
 145         return len;
 146 }
 147
 148 static struct cluster_attribute cluster_attr_cluster_name = {
 149         .attr   = { .ca_owner = THIS_MODULE,
 150                     .ca_name = "cluster_name",
 151                     .ca_mode = S_IRUGO | S_IWUSR },
 152         .show   = cluster_cluster_name_read,
 153         .store  = cluster_cluster_name_write,
 154 };
 155
 156 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 157                            int *info_field, int check_zero,
 158                            const char *buf, size_t len)
 159 {
 160         unsigned int x;
 161
 162         if (!capable(CAP_SYS_ADMIN))
 163                 return -EACCES;
 164
 165         x = simple_strtoul(buf, NULL, 0);
 166
 167         if (check_zero && !x)
 168                 return -EINVAL;
 169
 170         *cl_field = x;
 171         *info_field = x;
 172
 173         return len;
 174 }
 175
 176 #define CLUSTER_ATTR(name, check_zero)                                        \
 177 static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
 178 {                                                                             \
 179         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 180                            check_zero, buf, len);                             \
 181 }                                                                             \
 182 static ssize_t name##_read(struct dlm_cluster *cl, char *buf)                 \
 183 {                                                                             \
 184         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 185 }                                                                             \
 186 static struct cluster_attribute cluster_attr_##name =                         \
 187 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
 188
 189 CLUSTER_ATTR(tcp_port, 1);
 190 CLUSTER_ATTR(buffer_size, 1);
 191 CLUSTER_ATTR(rsbtbl_size, 1);
 192 CLUSTER_ATTR(dirtbl_size, 1);
 193 CLUSTER_ATTR(recover_timer, 1);
 194 CLUSTER_ATTR(toss_secs, 1);
 195 CLUSTER_ATTR(scan_secs, 1);
 196 CLUSTER_ATTR(log_debug, 0);
 197 CLUSTER_ATTR(protocol, 0);
 198 CLUSTER_ATTR(timewarn_cs, 1);
 199 CLUSTER_ATTR(waitwarn_us, 0);
 200 CLUSTER_ATTR(new_rsb_count, 0);
 201 CLUSTER_ATTR(recover_callbacks, 0);
 202
 203 static struct configfs_attribute *cluster_attrs[] = {
 204         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
 205         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
 206         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
 207         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
 208         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
 209         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
 210         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
 211         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
 212         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
 213         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
 214         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
 215         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
 216         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr,
 217         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr,
 218         NULL,
 219 };
 220
 221 enum {
 222         COMM_ATTR_NODEID = 0,
 223         COMM_ATTR_LOCAL,
 224         COMM_ATTR_ADDR,
 225         COMM_ATTR_ADDR_LIST,
 226 };
 227
 228 struct comm_attribute {
 229         struct configfs_attribute attr;
 230         ssize_t (*show)(struct dlm_comm *, char *);
 231         ssize_t (*store)(struct dlm_comm *, const char *, size_t);
 232 };
 233
 234 static struct comm_attribute comm_attr_nodeid = {
 235         .attr   = { .ca_owner = THIS_MODULE,
 236                     .ca_name = "nodeid",
 237                     .ca_mode = S_IRUGO | S_IWUSR },
 238         .show   = comm_nodeid_read,
 239         .store  = comm_nodeid_write,
 240 };
 241
 242 static struct comm_attribute comm_attr_local = {
 243         .attr   = { .ca_owner = THIS_MODULE,
 244                     .ca_name = "local",
 245                     .ca_mode = S_IRUGO | S_IWUSR },
 246         .show   = comm_local_read,
 247         .store  = comm_local_write,
 248 };
 249
 250 static struct comm_attribute comm_attr_addr = {
 251         .attr   = { .ca_owner = THIS_MODULE,
 252                     .ca_name = "addr",
 253                     .ca_mode = S_IWUSR },
 254         .store  = comm_addr_write,
 255 };
 256
 257 static struct comm_attribute comm_attr_addr_list = {
 258         .attr   = { .ca_owner = THIS_MODULE,
 259                     .ca_name = "addr_list",
 260                     .ca_mode = S_IRUGO },
 261         .show   = comm_addr_list_read,
 262 };
 263
 264 static struct configfs_attribute *comm_attrs[] = {
 265         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
 266         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
 267         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
 268         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
 269         NULL,
 270 };
 271
 272 enum {
 273         NODE_ATTR_NODEID = 0,
 274         NODE_ATTR_WEIGHT,
 275 };
 276
 277 struct node_attribute {
 278         struct configfs_attribute attr;
 279         ssize_t (*show)(struct dlm_node *, char *);
 280         ssize_t (*store)(struct dlm_node *, const char *, size_t);
 281 };
 282
 283 static struct node_attribute node_attr_nodeid = {
 284         .attr   = { .ca_owner = THIS_MODULE,
 285                     .ca_name = "nodeid",
 286                     .ca_mode = S_IRUGO | S_IWUSR },
 287         .show   = node_nodeid_read,
 288         .store  = node_nodeid_write,
 289 };
 290
 291 static struct node_attribute node_attr_weight = {
 292         .attr   = { .ca_owner = THIS_MODULE,
 293                     .ca_name = "weight",
 294                     .ca_mode = S_IRUGO | S_IWUSR },
 295         .show   = node_weight_read,
 296         .store  = node_weight_write,
 297 };
 298
 299 static struct configfs_attribute *node_attrs[] = {
 300         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
 301         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
 302         NULL,
 303 };
 304
 305 struct dlm_clusters {
 306         struct configfs_subsystem subsys;
 307 };
 308
 309 struct dlm_spaces {
 310         struct config_group ss_group;
 311 };
 312
 313 struct dlm_space {
 314         struct config_group group;
 315         struct list_head members;
 316         struct mutex members_lock;
 317         int members_count;
 318 };
 319
 320 struct dlm_comms {
 321         struct config_group cs_group;
 322 };
 323
 324 struct dlm_comm {
 325         struct config_item item;
 326         int seq;
 327         int nodeid;
 328         int local;
 329         int addr_count;
 330         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 331 };
 332
 333 struct dlm_nodes {
 334         struct config_group ns_group;
 335 };
 336
 337 struct dlm_node {
 338         struct config_item item;
 339         struct list_head list; /* space->members */
 340         int nodeid;
 341         int weight;
 342         int new;
 343         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 344 };
 345
 346 static struct configfs_group_operations clusters_ops = {
 347         .make_group = make_cluster,
 348         .drop_item = drop_cluster,
 349 };
 350
 351 static struct configfs_item_operations cluster_ops = {
 352         .release = release_cluster,
 353         .show_attribute = show_cluster,
 354         .store_attribute = store_cluster,
 355 };
 356
 357 static struct configfs_group_operations spaces_ops = {
 358         .make_group = make_space,
 359         .drop_item = drop_space,
 360 };
 361
 362 static struct configfs_item_operations space_ops = {
 363         .release = release_space,
 364 };
 365
 366 static struct configfs_group_operations comms_ops = {
 367         .make_item = make_comm,
 368         .drop_item = drop_comm,
 369 };
 370
 371 static struct configfs_item_operations comm_ops = {
 372         .release = release_comm,
 373         .show_attribute = show_comm,
 374         .store_attribute = store_comm,
 375 };
 376
 377 static struct configfs_group_operations nodes_ops = {
 378         .make_item = make_node,
 379         .drop_item = drop_node,
 380 };
 381
 382 static struct configfs_item_operations node_ops = {
 383         .release = release_node,
 384         .show_attribute = show_node,
 385         .store_attribute = store_node,
 386 };
 387
 388 static struct config_item_type clusters_type = {
 389         .ct_group_ops = &clusters_ops,
 390         .ct_owner = THIS_MODULE,
 391 };
 392
 393 static struct config_item_type cluster_type = {
 394         .ct_item_ops = &cluster_ops,
 395         .ct_attrs = cluster_attrs,
 396         .ct_owner = THIS_MODULE,
 397 };
 398
 399 static struct config_item_type spaces_type = {
 400         .ct_group_ops = &spaces_ops,
 401         .ct_owner = THIS_MODULE,
 402 };
 403
 404 static struct config_item_type space_type = {
 405         .ct_item_ops = &space_ops,
 406         .ct_owner = THIS_MODULE,
 407 };
 408
 409 static struct config_item_type comms_type = {
 410         .ct_group_ops = &comms_ops,
 411         .ct_owner = THIS_MODULE,
 412 };
 413
 414 static struct config_item_type comm_type = {
 415         .ct_item_ops = &comm_ops,
 416         .ct_attrs = comm_attrs,
 417         .ct_owner = THIS_MODULE,
 418 };
 419
 420 static struct config_item_type nodes_type = {
 421         .ct_group_ops = &nodes_ops,
 422         .ct_owner = THIS_MODULE,
 423 };
 424
 425 static struct config_item_type node_type = {
 426         .ct_item_ops = &node_ops,
 427         .ct_attrs = node_attrs,
 428         .ct_owner = THIS_MODULE,
 429 };
 430
 431 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
 432 {
 433         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
 434                    NULL;
 435 }
 436
 437 static struct dlm_space *config_item_to_space(struct config_item *i)
 438 {
 439         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 440                    NULL;
 441 }
 442
 443 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 444 {
 445         return i ? container_of(i, struct dlm_comm, item) : NULL;
 446 }
 447
 448 static struct dlm_node *config_item_to_node(struct config_item *i)
 449 {
 450         return i ? container_of(i, struct dlm_node, item) : NULL;
 451 }
 452
 453 static struct config_group *make_cluster(struct config_group *g,
 454                                          const char *name)
 455 {
 456         struct dlm_cluster *cl = NULL;
 457         struct dlm_spaces *sps = NULL;
 458         struct dlm_comms *cms = NULL;
 459         void *gps = NULL;
 460
 461         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 462         gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
 463         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 464         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 465
 466         if (!cl || !gps || !sps || !cms)
 467                 goto fail;
 468
 469         config_group_init_type_name(&cl->group, name, &cluster_type);
 470         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 471         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 472
 473         cl->group.default_groups = gps;
 474         cl->group.default_groups[0] = &sps->ss_group;
 475         cl->group.default_groups[1] = &cms->cs_group;
 476         cl->group.default_groups[2] = NULL;
 477
 478         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 479         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 480         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 481         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
 482         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 483         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 484         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 485         cl->cl_log_debug = dlm_config.ci_log_debug;
 486         cl->cl_protocol = dlm_config.ci_protocol;
 487         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 488         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 489         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 490         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 491         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 492                DLM_LOCKSPACE_LEN);
 493
 494         space_list = &sps->ss_group;
 495         comm_list = &cms->cs_group;
 496         return &cl->group;
 497
 498  fail:
 499         kfree(cl);
 500         kfree(gps);
 501         kfree(sps);
 502         kfree(cms);
 503         return ERR_PTR(-ENOMEM);
 504 }
 505
 506 static void drop_cluster(struct config_group *g, struct config_item *i)
 507 {
 508         struct dlm_cluster *cl = config_item_to_cluster(i);
 509         struct config_item *tmp;
 510         int j;
 511
 512         for (j = 0; cl->group.default_groups[j]; j++) {
 513                 tmp = &cl->group.default_groups[j]->cg_item;
 514                 cl->group.default_groups[j] = NULL;
 515                 config_item_put(tmp);
 516         }
 517
 518         space_list = NULL;
 519         comm_list = NULL;
 520
 521         config_item_put(i);
 522 }
 523
 524 static void release_cluster(struct config_item *i)
 525 {
 526         struct dlm_cluster *cl = config_item_to_cluster(i);
 527         kfree(cl->group.default_groups);
 528         kfree(cl);
 529 }
 530
 531 static struct config_group *make_space(struct config_group *g, const char *name)
 532 {
 533         struct dlm_space *sp = NULL;
 534         struct dlm_nodes *nds = NULL;
 535         void *gps = NULL;
 536
 537         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 538         gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
 539         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 540
 541         if (!sp || !gps || !nds)
 542                 goto fail;
 543
 544         config_group_init_type_name(&sp->group, name, &space_type);
 545         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 546
 547         sp->group.default_groups = gps;
 548         sp->group.default_groups[0] = &nds->ns_group;
 549         sp->group.default_groups[1] = NULL;
 550
 551         INIT_LIST_HEAD(&sp->members);
 552         mutex_init(&sp->members_lock);
 553         sp->members_count = 0;
 554         return &sp->group;
 555
 556  fail:
 557         kfree(sp);
 558         kfree(gps);
 559         kfree(nds);
 560         return ERR_PTR(-ENOMEM);
 561 }
 562
 563 static void drop_space(struct config_group *g, struct config_item *i)
 564 {
 565         struct dlm_space *sp = config_item_to_space(i);
 566         struct config_item *tmp;
 567         int j;
 568
 569         /* assert list_empty(&sp->members) */
 570
 571         for (j = 0; sp->group.default_groups[j]; j++) {
 572                 tmp = &sp->group.default_groups[j]->cg_item;
 573                 sp->group.default_groups[j] = NULL;
 574                 config_item_put(tmp);
 575         }
 576
 577         config_item_put(i);
 578 }
 579
 580 static void release_space(struct config_item *i)
 581 {
 582         struct dlm_space *sp = config_item_to_space(i);
 583         kfree(sp->group.default_groups);
 584         kfree(sp);
 585 }
 586
 587 static struct config_item *make_comm(struct config_group *g, const char *name)
 588 {
 589         struct dlm_comm *cm;
 590
 591         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 592         if (!cm)
 593                 return ERR_PTR(-ENOMEM);
 594
 595         config_item_init_type_name(&cm->item, name, &comm_type);
 596
 597         cm->seq = dlm_comm_count++;
 598         if (!cm->seq)
 599                 cm->seq = dlm_comm_count++;
 600
 601         cm->nodeid = -1;
 602         cm->local = 0;
 603         cm->addr_count = 0;
 604         return &cm->item;
 605 }
 606
 607 static void drop_comm(struct config_group *g, struct config_item *i)
 608 {
 609         struct dlm_comm *cm = config_item_to_comm(i);
 610         if (local_comm == cm)
 611                 local_comm = NULL;
 612         dlm_lowcomms_close(cm->nodeid);
 613         while (cm->addr_count--)
 614                 kfree(cm->addr[cm->addr_count]);
 615         config_item_put(i);
 616 }
 617
 618 static void release_comm(struct config_item *i)
 619 {
 620         struct dlm_comm *cm = config_item_to_comm(i);
 621         kfree(cm);
 622 }
 623
 624 static struct config_item *make_node(struct config_group *g, const char *name)
 625 {
 626         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 627         struct dlm_node *nd;
 628
 629         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 630         if (!nd)
 631                 return ERR_PTR(-ENOMEM);
 632
 633         config_item_init_type_name(&nd->item, name, &node_type);
 634         nd->nodeid = -1;
 635         nd->weight = 1;  /* default weight of 1 if none is set */
 636         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 637
 638         mutex_lock(&sp->members_lock);
 639         list_add(&nd->list, &sp->members);
 640         sp->members_count++;
 641         mutex_unlock(&sp->members_lock);
 642
 643         return &nd->item;
 644 }
 645
 646 static void drop_node(struct config_group *g, struct config_item *i)
 647 {
 648         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 649         struct dlm_node *nd = config_item_to_node(i);
 650
 651         mutex_lock(&sp->members_lock);
 652         list_del(&nd->list);
 653         sp->members_count--;
 654         mutex_unlock(&sp->members_lock);
 655
 656         config_item_put(i);
 657 }
 658
 659 static void release_node(struct config_item *i)
 660 {
 661         struct dlm_node *nd = config_item_to_node(i);
 662         kfree(nd);
 663 }
 664
 665 static struct dlm_clusters clusters_root = {
 666         .subsys = {
 667                 .su_group = {
 668                         .cg_item = {
 669                                 .ci_namebuf = "dlm",
 670                                 .ci_type = &clusters_type,
 671                         },
 672                 },
 673         },
 674 };
 675
 676 int __init dlm_config_init(void)
 677 {
 678         config_group_init(&clusters_root.subsys.su_group);
 679         mutex_init(&clusters_root.subsys.su_mutex);
 680         return configfs_register_subsystem(&clusters_root.subsys);
 681 }
 682
 683 void dlm_config_exit(void)
 684 {
 685         configfs_unregister_subsystem(&clusters_root.subsys);
 686 }
 687
 688 /*
 689  * Functions for user space to read/write attributes
 690  */
 691
 692 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 693                             char *buf)
 694 {
 695         struct dlm_cluster *cl = config_item_to_cluster(i);
 696         struct cluster_attribute *cla =
 697                         container_of(a, struct cluster_attribute, attr);
 698         return cla->show ? cla->show(cl, buf) : 0;
 699 }
 700
 701 static ssize_t store_cluster(struct config_item *i,
 702                              struct configfs_attribute *a,
 703                              const char *buf, size_t len)
 704 {
 705         struct dlm_cluster *cl = config_item_to_cluster(i);
 706         struct cluster_attribute *cla =
 707                 container_of(a, struct cluster_attribute, attr);
 708         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 709 }
 710
 711 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 712                          char *buf)
 713 {
 714         struct dlm_comm *cm = config_item_to_comm(i);
 715         struct comm_attribute *cma =
 716                         container_of(a, struct comm_attribute, attr);
 717         return cma->show ? cma->show(cm, buf) : 0;
 718 }
 719
 720 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 721                           const char *buf, size_t len)
 722 {
 723         struct dlm_comm *cm = config_item_to_comm(i);
 724         struct comm_attribute *cma =
 725                 container_of(a, struct comm_attribute, attr);
 726         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 727 }
 728
 729 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
 730 {
 731         return sprintf(buf, "%d\n", cm->nodeid);
 732 }
 733
 734 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
 735                                  size_t len)
 736 {
 737         cm->nodeid = simple_strtol(buf, NULL, 0);
 738         return len;
 739 }
 740
 741 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
 742 {
 743         return sprintf(buf, "%d\n", cm->local);
 744 }
 745
 746 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
 747                                 size_t len)
 748 {
 749         cm->local= simple_strtol(buf, NULL, 0);
 750         if (cm->local && !local_comm)
 751                 local_comm = cm;
 752         return len;
 753 }
 754
 755 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
 756 {
 757         struct sockaddr_storage *addr;
 758
 759         if (len != sizeof(struct sockaddr_storage))
 760                 return -EINVAL;
 761
 762         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 763                 return -ENOSPC;
 764
 765         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 766         if (!addr)
 767                 return -ENOMEM;
 768
 769         memcpy(addr, buf, len);
 770         cm->addr[cm->addr_count++] = addr;
 771         return len;
 772 }
 773
 774 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
 775 {
 776         ssize_t s;
 777         ssize_t allowance;
 778         int i;
 779         struct sockaddr_storage *addr;
 780         struct sockaddr_in *addr_in;
 781         struct sockaddr_in6 *addr_in6;
 782
 783         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 784         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 785
 786
 787         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 788         allowance = 4096;
 789         buf[0] = '\0';
 790
 791         for (i = 0; i < cm->addr_count; i++) {
 792                 addr = cm->addr[i];
 793
 794                 switch(addr->ss_family) {
 795                 case AF_INET:
 796                         addr_in = (struct sockaddr_in *)addr;
 797                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 798                         break;
 799                 case AF_INET6:
 800                         addr_in6 = (struct sockaddr_in6 *)addr;
 801                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 802                         break;
 803                 default:
 804                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 805                         break;
 806                 }
 807                 allowance -= s;
 808                 if (allowance >= 0)
 809                         strcat(buf, buf0);
 810                 else {
 811                         allowance += s;
 812                         break;
 813                 }
 814         }
 815         return 4096 - allowance;
 816 }
 817
 818 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 819                          char *buf)
 820 {
 821         struct dlm_node *nd = config_item_to_node(i);
 822         struct node_attribute *nda =
 823                         container_of(a, struct node_attribute, attr);
 824         return nda->show ? nda->show(nd, buf) : 0;
 825 }
 826
 827 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 828                           const char *buf, size_t len)
 829 {
 830         struct dlm_node *nd = config_item_to_node(i);
 831         struct node_attribute *nda =
 832                 container_of(a, struct node_attribute, attr);
 833         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 834 }
 835
 836 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
 837 {
 838         return sprintf(buf, "%d\n", nd->nodeid);
 839 }
 840
 841 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
 842                                  size_t len)
 843 {
 844         uint32_t seq = 0;
 845         nd->nodeid = simple_strtol(buf, NULL, 0);
 846         dlm_comm_seq(nd->nodeid, &seq);
 847         nd->comm_seq = seq;
 848         return len;
 849 }
 850
 851 static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
 852 {
 853         return sprintf(buf, "%d\n", nd->weight);
 854 }
 855
 856 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
 857                                  size_t len)
 858 {
 859         nd->weight = simple_strtol(buf, NULL, 0);
 860         return len;
 861 }
 862
 863 /*
 864  * Functions for the dlm to get the info that's been configured
 865  */
 866
 867 static struct dlm_space *get_space(char *name)
 868 {
 869         struct config_item *i;
 870
 871         if (!space_list)
 872                 return NULL;
 873
 874         mutex_lock(&space_list->cg_subsys->su_mutex);
 875         i = config_group_find_item(space_list, name);
 876         mutex_unlock(&space_list->cg_subsys->su_mutex);
 877
 878         return config_item_to_space(i);
 879 }
 880
 881 static void put_space(struct dlm_space *sp)
 882 {
 883         config_item_put(&sp->group.cg_item);
 884 }
 885
 886 static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
 887 {
 888         switch (x->ss_family) {
 889         case AF_INET: {
 890                 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
 891                 struct sockaddr_in *siny = (struct sockaddr_in *)y;
 892                 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
 893                         return 0;
 894                 if (sinx->sin_port != siny->sin_port)
 895                         return 0;
 896                 break;
 897         }
 898         case AF_INET6: {
 899                 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
 900                 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
 901                 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
 902                         return 0;
 903                 if (sinx->sin6_port != siny->sin6_port)
 904                         return 0;
 905                 break;
 906         }
 907         default:
 908                 return 0;
 909         }
 910         return 1;
 911 }
 912
 913 static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 914 {
 915         struct config_item *i;
 916         struct dlm_comm *cm = NULL;
 917         int found = 0;
 918
 919         if (!comm_list)
 920                 return NULL;
 921
 922         mutex_lock(&clusters_root.subsys.su_mutex);
 923
 924         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 925                 cm = config_item_to_comm(i);
 926
 927                 if (nodeid) {
 928                         if (cm->nodeid != nodeid)
 929                                 continue;
 930                         found = 1;
 931                         config_item_get(i);
 932                         break;
 933                 } else {
 934                         if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
 935                                 continue;
 936                         found = 1;
 937                         config_item_get(i);
 938                         break;
 939                 }
 940         }
 941         mutex_unlock(&clusters_root.subsys.su_mutex);
 942
 943         if (!found)
 944                 cm = NULL;
 945         return cm;
 946 }
 947
 948 static void put_comm(struct dlm_comm *cm)
 949 {
 950         config_item_put(&cm->item);
 951 }
 952
 953 /* caller must free mem */
 954 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 955                      int *count_out)
 956 {
 957         struct dlm_space *sp;
 958         struct dlm_node *nd;
 959         struct dlm_config_node *nodes, *node;
 960         int rv, count;
 961
 962         sp = get_space(lsname);
 963         if (!sp)
 964                 return -EEXIST;
 965
 966         mutex_lock(&sp->members_lock);
 967         if (!sp->members_count) {
 968                 rv = -EINVAL;
 969                 printk(KERN_ERR "dlm: zero members_count\n");
 970                 goto out;
 971         }
 972
 973         count = sp->members_count;
 974
 975         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 976         if (!nodes) {
 977                 rv = -ENOMEM;
 978                 goto out;
 979         }
 980
 981         node = nodes;
 982         list_for_each_entry(nd, &sp->members, list) {
 983                 node->nodeid = nd->nodeid;
 984                 node->weight = nd->weight;
 985                 node->new = nd->new;
 986                 node->comm_seq = nd->comm_seq;
 987                 node++;
 988
 989                 nd->new = 0;
 990         }
 991
 992         *count_out = count;
 993         *nodes_out = nodes;
 994         rv = 0;
 995  out:
 996         mutex_unlock(&sp->members_lock);
 997         put_space(sp);
 998         return rv;
 999 }
1000
1001 int dlm_comm_seq(int nodeid, uint32_t *seq)
1002 {
1003         struct dlm_comm *cm = get_comm(nodeid, NULL);
1004         if (!cm)
1005                 return -EEXIST;
1006         *seq = cm->seq;
1007         put_comm(cm);
1008         return 0;
1009 }
1010
1011 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
1012 {
1013         struct dlm_comm *cm = get_comm(nodeid, NULL);
1014         if (!cm)
1015                 return -EEXIST;
1016         if (!cm->addr_count)
1017                 return -ENOENT;
1018         memcpy(addr, cm->addr[0], sizeof(*addr));
1019         put_comm(cm);
1020         return 0;
1021 }
1022
1023 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
1024 {
1025         struct dlm_comm *cm = get_comm(0, addr);
1026         if (!cm)
1027                 return -EEXIST;
1028         *nodeid = cm->nodeid;
1029         put_comm(cm);
1030         return 0;
1031 }
1032
1033 int dlm_our_nodeid(void)
1034 {
1035         return local_comm ? local_comm->nodeid : 0;
1036 }
1037
1038 /* num 0 is first addr, num 1 is second addr */
1039 int dlm_our_addr(struct sockaddr_storage *addr, int num)
1040 {
1041         if (!local_comm)
1042                 return -1;
1043         if (num + 1 > local_comm->addr_count)
1044                 return -1;
1045         memcpy(addr, local_comm->addr[num], sizeof(*addr));
1046         return 0;
1047 }
1048
1049 /* Config file defaults */
1050 #define DEFAULT_TCP_PORT       21064
1051 #define DEFAULT_BUFFER_SIZE     4096
1052 #define DEFAULT_RSBTBL_SIZE     1024
1053 #define DEFAULT_DIRTBL_SIZE     1024
1054 #define DEFAULT_RECOVER_TIMER      5
1055 #define DEFAULT_TOSS_SECS         10
1056 #define DEFAULT_SCAN_SECS          5
1057 #define DEFAULT_LOG_DEBUG          0
1058 #define DEFAULT_PROTOCOL           0
1059 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
1060 #define DEFAULT_WAITWARN_US        0
1061 #define DEFAULT_NEW_RSB_COUNT    128
1062 #define DEFAULT_RECOVER_CALLBACKS  0
1063 #define DEFAULT_CLUSTER_NAME      ""
1064
1065 struct dlm_config_info dlm_config = {
1066         .ci_tcp_port = DEFAULT_TCP_PORT,
1067         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1068         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1069         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
1070         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1071         .ci_toss_secs = DEFAULT_TOSS_SECS,
1072         .ci_scan_secs = DEFAULT_SCAN_SECS,
1073         .ci_log_debug = DEFAULT_LOG_DEBUG,
1074         .ci_protocol = DEFAULT_PROTOCOL,
1075         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1076         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1077         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
1078         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
1079         .ci_cluster_name = DEFAULT_CLUSTER_NAME
1080 };
1081