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