fs/dlm/config.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2008 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 <net/ipv6.h>
  21 #include <net/sock.h>
  22
  23 #include "config.h"
  24 #include "lowcomms.h"
  25
  26 /*
  27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  29  * /config/dlm/<cluster>/comms/<comm>/nodeid
  30  * /config/dlm/<cluster>/comms/<comm>/local
  31  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  32  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  33  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  34  */
  35
  36 static struct config_group *space_list;
  37 static struct config_group *comm_list;
  38 static struct dlm_comm *local_comm;
  39
  40 struct dlm_clusters;
  41 struct dlm_cluster;
  42 struct dlm_spaces;
  43 struct dlm_space;
  44 struct dlm_comms;
  45 struct dlm_comm;
  46 struct dlm_nodes;
  47 struct dlm_node;
  48
  49 static struct config_group *make_cluster(struct config_group *, const char *);
  50 static void drop_cluster(struct config_group *, struct config_item *);
  51 static void release_cluster(struct config_item *);
  52 static struct config_group *make_space(struct config_group *, const char *);
  53 static void drop_space(struct config_group *, struct config_item *);
  54 static void release_space(struct config_item *);
  55 static struct config_item *make_comm(struct config_group *, const char *);
  56 static void drop_comm(struct config_group *, struct config_item *);
  57 static void release_comm(struct config_item *);
  58 static struct config_item *make_node(struct config_group *, const char *);
  59 static void drop_node(struct config_group *, struct config_item *);
  60 static void release_node(struct config_item *);
  61
  62 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
  63                             char *buf);
  64 static ssize_t store_cluster(struct config_item *i,
  65                              struct configfs_attribute *a,
  66                              const char *buf, size_t len);
  67 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
  68                          char *buf);
  69 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
  70                           const char *buf, size_t len);
  71 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
  72                          char *buf);
  73 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
  74                           const char *buf, size_t len);
  75
  76 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
  77 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
  78                                 size_t len);
  79 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
  80 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
  81                                 size_t len);
  82 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
  83                                 size_t len);
  84 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
  85 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
  86 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
  87                                 size_t len);
  88 static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
  89 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
  90                                 size_t len);
  91
  92 struct dlm_cluster {
  93         struct config_group group;
  94         unsigned int cl_tcp_port;
  95         unsigned int cl_buffer_size;
  96         unsigned int cl_rsbtbl_size;
  97         unsigned int cl_dirtbl_size;
  98         unsigned int cl_recover_timer;
  99         unsigned int cl_toss_secs;
 100         unsigned int cl_scan_secs;
 101         unsigned int cl_log_debug;
 102         unsigned int cl_protocol;
 103         unsigned int cl_timewarn_cs;
 104         unsigned int cl_waitwarn_us;
 105         unsigned int cl_new_rsb_count;
 106 };
 107
 108 enum {
 109         CLUSTER_ATTR_TCP_PORT = 0,
 110         CLUSTER_ATTR_BUFFER_SIZE,
 111         CLUSTER_ATTR_RSBTBL_SIZE,
 112         CLUSTER_ATTR_DIRTBL_SIZE,
 113         CLUSTER_ATTR_RECOVER_TIMER,
 114         CLUSTER_ATTR_TOSS_SECS,
 115         CLUSTER_ATTR_SCAN_SECS,
 116         CLUSTER_ATTR_LOG_DEBUG,
 117         CLUSTER_ATTR_PROTOCOL,
 118         CLUSTER_ATTR_TIMEWARN_CS,
 119         CLUSTER_ATTR_WAITWARN_US,
 120         CLUSTER_ATTR_NEW_RSB_COUNT,
 121 };
 122
 123 struct cluster_attribute {
 124         struct configfs_attribute attr;
 125         ssize_t (*show)(struct dlm_cluster *, char *);
 126         ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
 127 };
 128
 129 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 130                            int *info_field, int check_zero,
 131                            const char *buf, size_t len)
 132 {
 133         unsigned int x;
 134
 135         if (!capable(CAP_SYS_ADMIN))
 136                 return -EACCES;
 137
 138         x = simple_strtoul(buf, NULL, 0);
 139
 140         if (check_zero && !x)
 141                 return -EINVAL;
 142
 143         *cl_field = x;
 144         *info_field = x;
 145
 146         return len;
 147 }
 148
 149 #define CLUSTER_ATTR(name, check_zero)                                        \
 150 static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
 151 {                                                                             \
 152         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 153                            check_zero, buf, len);                             \
 154 }                                                                             \
 155 static ssize_t name##_read(struct dlm_cluster *cl, char *buf)                 \
 156 {                                                                             \
 157         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 158 }                                                                             \
 159 static struct cluster_attribute cluster_attr_##name =                         \
 160 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
 161
 162 CLUSTER_ATTR(tcp_port, 1);
 163 CLUSTER_ATTR(buffer_size, 1);
 164 CLUSTER_ATTR(rsbtbl_size, 1);
 165 CLUSTER_ATTR(dirtbl_size, 1);
 166 CLUSTER_ATTR(recover_timer, 1);
 167 CLUSTER_ATTR(toss_secs, 1);
 168 CLUSTER_ATTR(scan_secs, 1);
 169 CLUSTER_ATTR(log_debug, 0);
 170 CLUSTER_ATTR(protocol, 0);
 171 CLUSTER_ATTR(timewarn_cs, 1);
 172 CLUSTER_ATTR(waitwarn_us, 0);
 173 CLUSTER_ATTR(new_rsb_count, 0);
 174
 175 static struct configfs_attribute *cluster_attrs[] = {
 176         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
 177         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
 178         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
 179         [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr,
 180         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
 181         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
 182         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
 183         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
 184         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
 185         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
 186         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
 187         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
 188         NULL,
 189 };
 190
 191 enum {
 192         COMM_ATTR_NODEID = 0,
 193         COMM_ATTR_LOCAL,
 194         COMM_ATTR_ADDR,
 195         COMM_ATTR_ADDR_LIST,
 196 };
 197
 198 struct comm_attribute {
 199         struct configfs_attribute attr;
 200         ssize_t (*show)(struct dlm_comm *, char *);
 201         ssize_t (*store)(struct dlm_comm *, const char *, size_t);
 202 };
 203
 204 static struct comm_attribute comm_attr_nodeid = {
 205         .attr   = { .ca_owner = THIS_MODULE,
 206                     .ca_name = "nodeid",
 207                     .ca_mode = S_IRUGO | S_IWUSR },
 208         .show   = comm_nodeid_read,
 209         .store  = comm_nodeid_write,
 210 };
 211
 212 static struct comm_attribute comm_attr_local = {
 213         .attr   = { .ca_owner = THIS_MODULE,
 214                     .ca_name = "local",
 215                     .ca_mode = S_IRUGO | S_IWUSR },
 216         .show   = comm_local_read,
 217         .store  = comm_local_write,
 218 };
 219
 220 static struct comm_attribute comm_attr_addr = {
 221         .attr   = { .ca_owner = THIS_MODULE,
 222                     .ca_name = "addr",
 223                     .ca_mode = S_IWUSR },
 224         .store  = comm_addr_write,
 225 };
 226
 227 static struct comm_attribute comm_attr_addr_list = {
 228         .attr   = { .ca_owner = THIS_MODULE,
 229                     .ca_name = "addr_list",
 230                     .ca_mode = S_IRUGO },
 231         .show   = comm_addr_list_read,
 232 };
 233
 234 static struct configfs_attribute *comm_attrs[] = {
 235         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
 236         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
 237         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
 238         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
 239         NULL,
 240 };
 241
 242 enum {
 243         NODE_ATTR_NODEID = 0,
 244         NODE_ATTR_WEIGHT,
 245 };
 246
 247 struct node_attribute {
 248         struct configfs_attribute attr;
 249         ssize_t (*show)(struct dlm_node *, char *);
 250         ssize_t (*store)(struct dlm_node *, const char *, size_t);
 251 };
 252
 253 static struct node_attribute node_attr_nodeid = {
 254         .attr   = { .ca_owner = THIS_MODULE,
 255                     .ca_name = "nodeid",
 256                     .ca_mode = S_IRUGO | S_IWUSR },
 257         .show   = node_nodeid_read,
 258         .store  = node_nodeid_write,
 259 };
 260
 261 static struct node_attribute node_attr_weight = {
 262         .attr   = { .ca_owner = THIS_MODULE,
 263                     .ca_name = "weight",
 264                     .ca_mode = S_IRUGO | S_IWUSR },
 265         .show   = node_weight_read,
 266         .store  = node_weight_write,
 267 };
 268
 269 static struct configfs_attribute *node_attrs[] = {
 270         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
 271         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
 272         NULL,
 273 };
 274
 275 struct dlm_clusters {
 276         struct configfs_subsystem subsys;
 277 };
 278
 279 struct dlm_spaces {
 280         struct config_group ss_group;
 281 };
 282
 283 struct dlm_space {
 284         struct config_group group;
 285         struct list_head members;
 286         struct mutex members_lock;
 287         int members_count;
 288 };
 289
 290 struct dlm_comms {
 291         struct config_group cs_group;
 292 };
 293
 294 struct dlm_comm {
 295         struct config_item item;
 296         int nodeid;
 297         int local;
 298         int addr_count;
 299         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 300 };
 301
 302 struct dlm_nodes {
 303         struct config_group ns_group;
 304 };
 305
 306 struct dlm_node {
 307         struct config_item item;
 308         struct list_head list; /* space->members */
 309         int nodeid;
 310         int weight;
 311         int new;
 312 };
 313
 314 static struct configfs_group_operations clusters_ops = {
 315         .make_group = make_cluster,
 316         .drop_item = drop_cluster,
 317 };
 318
 319 static struct configfs_item_operations cluster_ops = {
 320         .release = release_cluster,
 321         .show_attribute = show_cluster,
 322         .store_attribute = store_cluster,
 323 };
 324
 325 static struct configfs_group_operations spaces_ops = {
 326         .make_group = make_space,
 327         .drop_item = drop_space,
 328 };
 329
 330 static struct configfs_item_operations space_ops = {
 331         .release = release_space,
 332 };
 333
 334 static struct configfs_group_operations comms_ops = {
 335         .make_item = make_comm,
 336         .drop_item = drop_comm,
 337 };
 338
 339 static struct configfs_item_operations comm_ops = {
 340         .release = release_comm,
 341         .show_attribute = show_comm,
 342         .store_attribute = store_comm,
 343 };
 344
 345 static struct configfs_group_operations nodes_ops = {
 346         .make_item = make_node,
 347         .drop_item = drop_node,
 348 };
 349
 350 static struct configfs_item_operations node_ops = {
 351         .release = release_node,
 352         .show_attribute = show_node,
 353         .store_attribute = store_node,
 354 };
 355
 356 static struct config_item_type clusters_type = {
 357         .ct_group_ops = &clusters_ops,
 358         .ct_owner = THIS_MODULE,
 359 };
 360
 361 static struct config_item_type cluster_type = {
 362         .ct_item_ops = &cluster_ops,
 363         .ct_attrs = cluster_attrs,
 364         .ct_owner = THIS_MODULE,
 365 };
 366
 367 static struct config_item_type spaces_type = {
 368         .ct_group_ops = &spaces_ops,
 369         .ct_owner = THIS_MODULE,
 370 };
 371
 372 static struct config_item_type space_type = {
 373         .ct_item_ops = &space_ops,
 374         .ct_owner = THIS_MODULE,
 375 };
 376
 377 static struct config_item_type comms_type = {
 378         .ct_group_ops = &comms_ops,
 379         .ct_owner = THIS_MODULE,
 380 };
 381
 382 static struct config_item_type comm_type = {
 383         .ct_item_ops = &comm_ops,
 384         .ct_attrs = comm_attrs,
 385         .ct_owner = THIS_MODULE,
 386 };
 387
 388 static struct config_item_type nodes_type = {
 389         .ct_group_ops = &nodes_ops,
 390         .ct_owner = THIS_MODULE,
 391 };
 392
 393 static struct config_item_type node_type = {
 394         .ct_item_ops = &node_ops,
 395         .ct_attrs = node_attrs,
 396         .ct_owner = THIS_MODULE,
 397 };
 398
 399 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
 400 {
 401         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
 402                    NULL;
 403 }
 404
 405 static struct dlm_space *config_item_to_space(struct config_item *i)
 406 {
 407         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 408                    NULL;
 409 }
 410
 411 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 412 {
 413         return i ? container_of(i, struct dlm_comm, item) : NULL;
 414 }
 415
 416 static struct dlm_node *config_item_to_node(struct config_item *i)
 417 {
 418         return i ? container_of(i, struct dlm_node, item) : NULL;
 419 }
 420
 421 static struct config_group *make_cluster(struct config_group *g,
 422                                          const char *name)
 423 {
 424         struct dlm_cluster *cl = NULL;
 425         struct dlm_spaces *sps = NULL;
 426         struct dlm_comms *cms = NULL;
 427         void *gps = NULL;
 428
 429         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 430         gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
 431         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 432         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 433
 434         if (!cl || !gps || !sps || !cms)
 435                 goto fail;
 436
 437         config_group_init_type_name(&cl->group, name, &cluster_type);
 438         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 439         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 440
 441         cl->group.default_groups = gps;
 442         cl->group.default_groups[0] = &sps->ss_group;
 443         cl->group.default_groups[1] = &cms->cs_group;
 444         cl->group.default_groups[2] = NULL;
 445
 446         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 447         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 448         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 449         cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size;
 450         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 451         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 452         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 453         cl->cl_log_debug = dlm_config.ci_log_debug;
 454         cl->cl_protocol = dlm_config.ci_protocol;
 455         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 456         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 457         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 458
 459         space_list = &sps->ss_group;
 460         comm_list = &cms->cs_group;
 461         return &cl->group;
 462
 463  fail:
 464         kfree(cl);
 465         kfree(gps);
 466         kfree(sps);
 467         kfree(cms);
 468         return ERR_PTR(-ENOMEM);
 469 }
 470
 471 static void drop_cluster(struct config_group *g, struct config_item *i)
 472 {
 473         struct dlm_cluster *cl = config_item_to_cluster(i);
 474         struct config_item *tmp;
 475         int j;
 476
 477         for (j = 0; cl->group.default_groups[j]; j++) {
 478                 tmp = &cl->group.default_groups[j]->cg_item;
 479                 cl->group.default_groups[j] = NULL;
 480                 config_item_put(tmp);
 481         }
 482
 483         space_list = NULL;
 484         comm_list = NULL;
 485
 486         config_item_put(i);
 487 }
 488
 489 static void release_cluster(struct config_item *i)
 490 {
 491         struct dlm_cluster *cl = config_item_to_cluster(i);
 492         kfree(cl->group.default_groups);
 493         kfree(cl);
 494 }
 495
 496 static struct config_group *make_space(struct config_group *g, const char *name)
 497 {
 498         struct dlm_space *sp = NULL;
 499         struct dlm_nodes *nds = NULL;
 500         void *gps = NULL;
 501
 502         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 503         gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
 504         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 505
 506         if (!sp || !gps || !nds)
 507                 goto fail;
 508
 509         config_group_init_type_name(&sp->group, name, &space_type);
 510         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 511
 512         sp->group.default_groups = gps;
 513         sp->group.default_groups[0] = &nds->ns_group;
 514         sp->group.default_groups[1] = NULL;
 515
 516         INIT_LIST_HEAD(&sp->members);
 517         mutex_init(&sp->members_lock);
 518         sp->members_count = 0;
 519         return &sp->group;
 520
 521  fail:
 522         kfree(sp);
 523         kfree(gps);
 524         kfree(nds);
 525         return ERR_PTR(-ENOMEM);
 526 }
 527
 528 static void drop_space(struct config_group *g, struct config_item *i)
 529 {
 530         struct dlm_space *sp = config_item_to_space(i);
 531         struct config_item *tmp;
 532         int j;
 533
 534         /* assert list_empty(&sp->members) */
 535
 536         for (j = 0; sp->group.default_groups[j]; j++) {
 537                 tmp = &sp->group.default_groups[j]->cg_item;
 538                 sp->group.default_groups[j] = NULL;
 539                 config_item_put(tmp);
 540         }
 541
 542         config_item_put(i);
 543 }
 544
 545 static void release_space(struct config_item *i)
 546 {
 547         struct dlm_space *sp = config_item_to_space(i);
 548         kfree(sp->group.default_groups);
 549         kfree(sp);
 550 }
 551
 552 static struct config_item *make_comm(struct config_group *g, const char *name)
 553 {
 554         struct dlm_comm *cm;
 555
 556         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 557         if (!cm)
 558                 return ERR_PTR(-ENOMEM);
 559
 560         config_item_init_type_name(&cm->item, name, &comm_type);
 561         cm->nodeid = -1;
 562         cm->local = 0;
 563         cm->addr_count = 0;
 564         return &cm->item;
 565 }
 566
 567 static void drop_comm(struct config_group *g, struct config_item *i)
 568 {
 569         struct dlm_comm *cm = config_item_to_comm(i);
 570         if (local_comm == cm)
 571                 local_comm = NULL;
 572         dlm_lowcomms_close(cm->nodeid);
 573         while (cm->addr_count--)
 574                 kfree(cm->addr[cm->addr_count]);
 575         config_item_put(i);
 576 }
 577
 578 static void release_comm(struct config_item *i)
 579 {
 580         struct dlm_comm *cm = config_item_to_comm(i);
 581         kfree(cm);
 582 }
 583
 584 static struct config_item *make_node(struct config_group *g, const char *name)
 585 {
 586         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 587         struct dlm_node *nd;
 588
 589         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 590         if (!nd)
 591                 return ERR_PTR(-ENOMEM);
 592
 593         config_item_init_type_name(&nd->item, name, &node_type);
 594         nd->nodeid = -1;
 595         nd->weight = 1;  /* default weight of 1 if none is set */
 596         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 597
 598         mutex_lock(&sp->members_lock);
 599         list_add(&nd->list, &sp->members);
 600         sp->members_count++;
 601         mutex_unlock(&sp->members_lock);
 602
 603         return &nd->item;
 604 }
 605
 606 static void drop_node(struct config_group *g, struct config_item *i)
 607 {
 608         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 609         struct dlm_node *nd = config_item_to_node(i);
 610
 611         mutex_lock(&sp->members_lock);
 612         list_del(&nd->list);
 613         sp->members_count--;
 614         mutex_unlock(&sp->members_lock);
 615
 616         config_item_put(i);
 617 }
 618
 619 static void release_node(struct config_item *i)
 620 {
 621         struct dlm_node *nd = config_item_to_node(i);
 622         kfree(nd);
 623 }
 624
 625 static struct dlm_clusters clusters_root = {
 626         .subsys = {
 627                 .su_group = {
 628                         .cg_item = {
 629                                 .ci_namebuf = "dlm",
 630                                 .ci_type = &clusters_type,
 631                         },
 632                 },
 633         },
 634 };
 635
 636 int __init dlm_config_init(void)
 637 {
 638         config_group_init(&clusters_root.subsys.su_group);
 639         mutex_init(&clusters_root.subsys.su_mutex);
 640         return configfs_register_subsystem(&clusters_root.subsys);
 641 }
 642
 643 void dlm_config_exit(void)
 644 {
 645         configfs_unregister_subsystem(&clusters_root.subsys);
 646 }
 647
 648 /*
 649  * Functions for user space to read/write attributes
 650  */
 651
 652 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 653                             char *buf)
 654 {
 655         struct dlm_cluster *cl = config_item_to_cluster(i);
 656         struct cluster_attribute *cla =
 657                         container_of(a, struct cluster_attribute, attr);
 658         return cla->show ? cla->show(cl, buf) : 0;
 659 }
 660
 661 static ssize_t store_cluster(struct config_item *i,
 662                              struct configfs_attribute *a,
 663                              const char *buf, size_t len)
 664 {
 665         struct dlm_cluster *cl = config_item_to_cluster(i);
 666         struct cluster_attribute *cla =
 667                 container_of(a, struct cluster_attribute, attr);
 668         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 669 }
 670
 671 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 672                          char *buf)
 673 {
 674         struct dlm_comm *cm = config_item_to_comm(i);
 675         struct comm_attribute *cma =
 676                         container_of(a, struct comm_attribute, attr);
 677         return cma->show ? cma->show(cm, buf) : 0;
 678 }
 679
 680 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 681                           const char *buf, size_t len)
 682 {
 683         struct dlm_comm *cm = config_item_to_comm(i);
 684         struct comm_attribute *cma =
 685                 container_of(a, struct comm_attribute, attr);
 686         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 687 }
 688
 689 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
 690 {
 691         return sprintf(buf, "%d\n", cm->nodeid);
 692 }
 693
 694 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
 695                                  size_t len)
 696 {
 697         cm->nodeid = simple_strtol(buf, NULL, 0);
 698         return len;
 699 }
 700
 701 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
 702 {
 703         return sprintf(buf, "%d\n", cm->local);
 704 }
 705
 706 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
 707                                 size_t len)
 708 {
 709         cm->local= simple_strtol(buf, NULL, 0);
 710         if (cm->local && !local_comm)
 711                 local_comm = cm;
 712         return len;
 713 }
 714
 715 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
 716 {
 717         struct sockaddr_storage *addr;
 718
 719         if (len != sizeof(struct sockaddr_storage))
 720                 return -EINVAL;
 721
 722         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 723                 return -ENOSPC;
 724
 725         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 726         if (!addr)
 727                 return -ENOMEM;
 728
 729         memcpy(addr, buf, len);
 730         cm->addr[cm->addr_count++] = addr;
 731         return len;
 732 }
 733
 734 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
 735 {
 736         ssize_t s;
 737         ssize_t allowance;
 738         int i;
 739         struct sockaddr_storage *addr;
 740         struct sockaddr_in *addr_in;
 741         struct sockaddr_in6 *addr_in6;
 742
 743         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 744         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 745
 746
 747         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 748         allowance = 4096;
 749         buf[0] = '\0';
 750
 751         for (i = 0; i < cm->addr_count; i++) {
 752                 addr = cm->addr[i];
 753
 754                 switch(addr->ss_family) {
 755                 case AF_INET:
 756                         addr_in = (struct sockaddr_in *)addr;
 757                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 758                         break;
 759                 case AF_INET6:
 760                         addr_in6 = (struct sockaddr_in6 *)addr;
 761                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 762                         break;
 763                 default:
 764                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 765                         break;
 766                 }
 767                 allowance -= s;
 768                 if (allowance >= 0)
 769                         strcat(buf, buf0);
 770                 else {
 771                         allowance += s;
 772                         break;
 773                 }
 774         }
 775         return 4096 - allowance;
 776 }
 777
 778 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 779                          char *buf)
 780 {
 781         struct dlm_node *nd = config_item_to_node(i);
 782         struct node_attribute *nda =
 783                         container_of(a, struct node_attribute, attr);
 784         return nda->show ? nda->show(nd, buf) : 0;
 785 }
 786
 787 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 788                           const char *buf, size_t len)
 789 {
 790         struct dlm_node *nd = config_item_to_node(i);
 791         struct node_attribute *nda =
 792                 container_of(a, struct node_attribute, attr);
 793         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 794 }
 795
 796 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
 797 {
 798         return sprintf(buf, "%d\n", nd->nodeid);
 799 }
 800
 801 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
 802                                  size_t len)
 803 {
 804         nd->nodeid = simple_strtol(buf, NULL, 0);
 805         return len;
 806 }
 807
 808 static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
 809 {
 810         return sprintf(buf, "%d\n", nd->weight);
 811 }
 812
 813 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
 814                                  size_t len)
 815 {
 816         nd->weight = simple_strtol(buf, NULL, 0);
 817         return len;
 818 }
 819
 820 /*
 821  * Functions for the dlm to get the info that's been configured
 822  */
 823
 824 static struct dlm_space *get_space(char *name)
 825 {
 826         struct config_item *i;
 827
 828         if (!space_list)
 829                 return NULL;
 830
 831         mutex_lock(&space_list->cg_subsys->su_mutex);
 832         i = config_group_find_item(space_list, name);
 833         mutex_unlock(&space_list->cg_subsys->su_mutex);
 834
 835         return config_item_to_space(i);
 836 }
 837
 838 static void put_space(struct dlm_space *sp)
 839 {
 840         config_item_put(&sp->group.cg_item);
 841 }
 842
 843 static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y)
 844 {
 845         switch (x->ss_family) {
 846         case AF_INET: {
 847                 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
 848                 struct sockaddr_in *siny = (struct sockaddr_in *)y;
 849                 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
 850                         return 0;
 851                 if (sinx->sin_port != siny->sin_port)
 852                         return 0;
 853                 break;
 854         }
 855         case AF_INET6: {
 856                 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
 857                 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
 858                 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
 859                         return 0;
 860                 if (sinx->sin6_port != siny->sin6_port)
 861                         return 0;
 862                 break;
 863         }
 864         default:
 865                 return 0;
 866         }
 867         return 1;
 868 }
 869
 870 static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr)
 871 {
 872         struct config_item *i;
 873         struct dlm_comm *cm = NULL;
 874         int found = 0;
 875
 876         if (!comm_list)
 877                 return NULL;
 878
 879         mutex_lock(&clusters_root.subsys.su_mutex);
 880
 881         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 882                 cm = config_item_to_comm(i);
 883
 884                 if (nodeid) {
 885                         if (cm->nodeid != nodeid)
 886                                 continue;
 887                         found = 1;
 888                         config_item_get(i);
 889                         break;
 890                 } else {
 891                         if (!cm->addr_count || !addr_compare(cm->addr[0], addr))
 892                                 continue;
 893                         found = 1;
 894                         config_item_get(i);
 895                         break;
 896                 }
 897         }
 898         mutex_unlock(&clusters_root.subsys.su_mutex);
 899
 900         if (!found)
 901                 cm = NULL;
 902         return cm;
 903 }
 904
 905 static void put_comm(struct dlm_comm *cm)
 906 {
 907         config_item_put(&cm->item);
 908 }
 909
 910 /* caller must free mem */
 911 int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out,
 912                     int **new_out, int *new_count_out)
 913 {
 914         struct dlm_space *sp;
 915         struct dlm_node *nd;
 916         int i = 0, rv = 0, ids_count = 0, new_count = 0;
 917         int *ids, *new;
 918
 919         sp = get_space(lsname);
 920         if (!sp)
 921                 return -EEXIST;
 922
 923         mutex_lock(&sp->members_lock);
 924         if (!sp->members_count) {
 925                 rv = -EINVAL;
 926                 printk(KERN_ERR "dlm: zero members_count\n");
 927                 goto out;
 928         }
 929
 930         ids_count = sp->members_count;
 931
 932         ids = kcalloc(ids_count, sizeof(int), GFP_NOFS);
 933         if (!ids) {
 934                 rv = -ENOMEM;
 935                 goto out;
 936         }
 937
 938         list_for_each_entry(nd, &sp->members, list) {
 939                 ids[i++] = nd->nodeid;
 940                 if (nd->new)
 941                         new_count++;
 942         }
 943
 944         if (ids_count != i)
 945                 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i);
 946
 947         if (!new_count)
 948                 goto out_ids;
 949
 950         new = kcalloc(new_count, sizeof(int), GFP_NOFS);
 951         if (!new) {
 952                 kfree(ids);
 953                 rv = -ENOMEM;
 954                 goto out;
 955         }
 956
 957         i = 0;
 958         list_for_each_entry(nd, &sp->members, list) {
 959                 if (nd->new) {
 960                         new[i++] = nd->nodeid;
 961                         nd->new = 0;
 962                 }
 963         }
 964         *new_count_out = new_count;
 965         *new_out = new;
 966
 967  out_ids:
 968         *ids_count_out = ids_count;
 969         *ids_out = ids;
 970  out:
 971         mutex_unlock(&sp->members_lock);
 972         put_space(sp);
 973         return rv;
 974 }
 975
 976 int dlm_node_weight(char *lsname, int nodeid)
 977 {
 978         struct dlm_space *sp;
 979         struct dlm_node *nd;
 980         int w = -EEXIST;
 981
 982         sp = get_space(lsname);
 983         if (!sp)
 984                 goto out;
 985
 986         mutex_lock(&sp->members_lock);
 987         list_for_each_entry(nd, &sp->members, list) {
 988                 if (nd->nodeid != nodeid)
 989                         continue;
 990                 w = nd->weight;
 991                 break;
 992         }
 993         mutex_unlock(&sp->members_lock);
 994         put_space(sp);
 995  out:
 996         return w;
 997 }
 998
 999 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr)
1000 {
1001         struct dlm_comm *cm = get_comm(nodeid, NULL);
1002         if (!cm)
1003                 return -EEXIST;
1004         if (!cm->addr_count)
1005                 return -ENOENT;
1006         memcpy(addr, cm->addr[0], sizeof(*addr));
1007         put_comm(cm);
1008         return 0;
1009 }
1010
1011 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid)
1012 {
1013         struct dlm_comm *cm = get_comm(0, addr);
1014         if (!cm)
1015                 return -EEXIST;
1016         *nodeid = cm->nodeid;
1017         put_comm(cm);
1018         return 0;
1019 }
1020
1021 int dlm_our_nodeid(void)
1022 {
1023         return local_comm ? local_comm->nodeid : 0;
1024 }
1025
1026 /* num 0 is first addr, num 1 is second addr */
1027 int dlm_our_addr(struct sockaddr_storage *addr, int num)
1028 {
1029         if (!local_comm)
1030                 return -1;
1031         if (num + 1 > local_comm->addr_count)
1032                 return -1;
1033         memcpy(addr, local_comm->addr[num], sizeof(*addr));
1034         return 0;
1035 }
1036
1037 /* Config file defaults */
1038 #define DEFAULT_TCP_PORT       21064
1039 #define DEFAULT_BUFFER_SIZE     4096
1040 #define DEFAULT_RSBTBL_SIZE     1024
1041 #define DEFAULT_DIRTBL_SIZE     1024
1042 #define DEFAULT_RECOVER_TIMER      5
1043 #define DEFAULT_TOSS_SECS         10
1044 #define DEFAULT_SCAN_SECS          5
1045 #define DEFAULT_LOG_DEBUG          0
1046 #define DEFAULT_PROTOCOL           0
1047 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
1048 #define DEFAULT_WAITWARN_US        0
1049 #define DEFAULT_NEW_RSB_COUNT    128
1050
1051 struct dlm_config_info dlm_config = {
1052         .ci_tcp_port = DEFAULT_TCP_PORT,
1053         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1054         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1055         .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE,
1056         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1057         .ci_toss_secs = DEFAULT_TOSS_SECS,
1058         .ci_scan_secs = DEFAULT_SCAN_SECS,
1059         .ci_log_debug = DEFAULT_LOG_DEBUG,
1060         .ci_protocol = DEFAULT_PROTOCOL,
1061         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1062         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1063         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT
1064 };
1065