fs/dlm/config.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3 *******************************************************************************
   4 **
   5 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   6 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   7 **
   8 **
   9 *******************************************************************************
  10 ******************************************************************************/
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/configfs.h>
  15 #include <linux/slab.h>
  16 #include <linux/in.h>
  17 #include <linux/in6.h>
  18 #include <linux/dlmconstants.h>
  19 #include <net/ipv6.h>
  20 #include <net/sock.h>
  21
  22 #include "config.h"
  23 #include "lowcomms.h"
  24
  25 /*
  26  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  28  * /config/dlm/<cluster>/comms/<comm>/nodeid
  29  * /config/dlm/<cluster>/comms/<comm>/local
  30  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  31  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  32  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  33  */
  34
  35 static struct config_group *space_list;
  36 static struct config_group *comm_list;
  37 static struct dlm_comm *local_comm;
  38 static uint32_t dlm_comm_count;
  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 struct configfs_attribute *comm_attrs[];
  63 static struct configfs_attribute *node_attrs[];
  64
  65 struct dlm_cluster {
  66         struct config_group group;
  67         unsigned int cl_tcp_port;
  68         unsigned int cl_buffer_size;
  69         unsigned int cl_rsbtbl_size;
  70         unsigned int cl_recover_timer;
  71         unsigned int cl_toss_secs;
  72         unsigned int cl_scan_secs;
  73         unsigned int cl_log_debug;
  74         unsigned int cl_log_info;
  75         unsigned int cl_protocol;
  76         unsigned int cl_timewarn_cs;
  77         unsigned int cl_waitwarn_us;
  78         unsigned int cl_new_rsb_count;
  79         unsigned int cl_recover_callbacks;
  80         char cl_cluster_name[DLM_LOCKSPACE_LEN];
  81
  82         struct dlm_spaces *sps;
  83         struct dlm_comms *cms;
  84 };
  85
  86 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  87 {
  88         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  89                    NULL;
  90 }
  91
  92 enum {
  93         CLUSTER_ATTR_TCP_PORT = 0,
  94         CLUSTER_ATTR_BUFFER_SIZE,
  95         CLUSTER_ATTR_RSBTBL_SIZE,
  96         CLUSTER_ATTR_RECOVER_TIMER,
  97         CLUSTER_ATTR_TOSS_SECS,
  98         CLUSTER_ATTR_SCAN_SECS,
  99         CLUSTER_ATTR_LOG_DEBUG,
 100         CLUSTER_ATTR_LOG_INFO,
 101         CLUSTER_ATTR_PROTOCOL,
 102         CLUSTER_ATTR_TIMEWARN_CS,
 103         CLUSTER_ATTR_WAITWARN_US,
 104         CLUSTER_ATTR_NEW_RSB_COUNT,
 105         CLUSTER_ATTR_RECOVER_CALLBACKS,
 106         CLUSTER_ATTR_CLUSTER_NAME,
 107 };
 108
 109 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
 110 {
 111         struct dlm_cluster *cl = config_item_to_cluster(item);
 112         return sprintf(buf, "%s\n", cl->cl_cluster_name);
 113 }
 114
 115 static ssize_t cluster_cluster_name_store(struct config_item *item,
 116                                           const char *buf, size_t len)
 117 {
 118         struct dlm_cluster *cl = config_item_to_cluster(item);
 119
 120         strlcpy(dlm_config.ci_cluster_name, buf,
 121                                 sizeof(dlm_config.ci_cluster_name));
 122         strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
 123         return len;
 124 }
 125
 126 CONFIGFS_ATTR(cluster_, cluster_name);
 127
 128 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 129                            int *info_field, int check_zero,
 130                            const char *buf, size_t len)
 131 {
 132         unsigned int x;
 133         int rc;
 134
 135         if (!capable(CAP_SYS_ADMIN))
 136                 return -EPERM;
 137         rc = kstrtouint(buf, 0, &x);
 138         if (rc)
 139                 return rc;
 140
 141         if (check_zero && !x)
 142                 return -EINVAL;
 143
 144         *cl_field = x;
 145         *info_field = x;
 146
 147         return len;
 148 }
 149
 150 #define CLUSTER_ATTR(name, check_zero)                                        \
 151 static ssize_t cluster_##name##_store(struct config_item *item, \
 152                 const char *buf, size_t len) \
 153 {                                                                             \
 154         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 155         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 156                            check_zero, buf, len);                             \
 157 }                                                                             \
 158 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 159 {                                                                             \
 160         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 161         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 162 }                                                                             \
 163 CONFIGFS_ATTR(cluster_, name);
 164
 165 CLUSTER_ATTR(tcp_port, 1);
 166 CLUSTER_ATTR(buffer_size, 1);
 167 CLUSTER_ATTR(rsbtbl_size, 1);
 168 CLUSTER_ATTR(recover_timer, 1);
 169 CLUSTER_ATTR(toss_secs, 1);
 170 CLUSTER_ATTR(scan_secs, 1);
 171 CLUSTER_ATTR(log_debug, 0);
 172 CLUSTER_ATTR(log_info, 0);
 173 CLUSTER_ATTR(protocol, 0);
 174 CLUSTER_ATTR(timewarn_cs, 1);
 175 CLUSTER_ATTR(waitwarn_us, 0);
 176 CLUSTER_ATTR(new_rsb_count, 0);
 177 CLUSTER_ATTR(recover_callbacks, 0);
 178
 179 static struct configfs_attribute *cluster_attrs[] = {
 180         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 181         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 182         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 183         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 184         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 185         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 186         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 187         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 188         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 189         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 190         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
 191         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 192         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 193         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 194         NULL,
 195 };
 196
 197 enum {
 198         COMM_ATTR_NODEID = 0,
 199         COMM_ATTR_LOCAL,
 200         COMM_ATTR_ADDR,
 201         COMM_ATTR_ADDR_LIST,
 202 };
 203
 204 enum {
 205         NODE_ATTR_NODEID = 0,
 206         NODE_ATTR_WEIGHT,
 207 };
 208
 209 struct dlm_clusters {
 210         struct configfs_subsystem subsys;
 211 };
 212
 213 struct dlm_spaces {
 214         struct config_group ss_group;
 215 };
 216
 217 struct dlm_space {
 218         struct config_group group;
 219         struct list_head members;
 220         struct mutex members_lock;
 221         int members_count;
 222         struct dlm_nodes *nds;
 223 };
 224
 225 struct dlm_comms {
 226         struct config_group cs_group;
 227 };
 228
 229 struct dlm_comm {
 230         struct config_item item;
 231         int seq;
 232         int nodeid;
 233         int local;
 234         int addr_count;
 235         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 236 };
 237
 238 struct dlm_nodes {
 239         struct config_group ns_group;
 240 };
 241
 242 struct dlm_node {
 243         struct config_item item;
 244         struct list_head list; /* space->members */
 245         int nodeid;
 246         int weight;
 247         int new;
 248         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 249 };
 250
 251 static struct configfs_group_operations clusters_ops = {
 252         .make_group = make_cluster,
 253         .drop_item = drop_cluster,
 254 };
 255
 256 static struct configfs_item_operations cluster_ops = {
 257         .release = release_cluster,
 258 };
 259
 260 static struct configfs_group_operations spaces_ops = {
 261         .make_group = make_space,
 262         .drop_item = drop_space,
 263 };
 264
 265 static struct configfs_item_operations space_ops = {
 266         .release = release_space,
 267 };
 268
 269 static struct configfs_group_operations comms_ops = {
 270         .make_item = make_comm,
 271         .drop_item = drop_comm,
 272 };
 273
 274 static struct configfs_item_operations comm_ops = {
 275         .release = release_comm,
 276 };
 277
 278 static struct configfs_group_operations nodes_ops = {
 279         .make_item = make_node,
 280         .drop_item = drop_node,
 281 };
 282
 283 static struct configfs_item_operations node_ops = {
 284         .release = release_node,
 285 };
 286
 287 static const struct config_item_type clusters_type = {
 288         .ct_group_ops = &clusters_ops,
 289         .ct_owner = THIS_MODULE,
 290 };
 291
 292 static const struct config_item_type cluster_type = {
 293         .ct_item_ops = &cluster_ops,
 294         .ct_attrs = cluster_attrs,
 295         .ct_owner = THIS_MODULE,
 296 };
 297
 298 static const struct config_item_type spaces_type = {
 299         .ct_group_ops = &spaces_ops,
 300         .ct_owner = THIS_MODULE,
 301 };
 302
 303 static const struct config_item_type space_type = {
 304         .ct_item_ops = &space_ops,
 305         .ct_owner = THIS_MODULE,
 306 };
 307
 308 static const struct config_item_type comms_type = {
 309         .ct_group_ops = &comms_ops,
 310         .ct_owner = THIS_MODULE,
 311 };
 312
 313 static const struct config_item_type comm_type = {
 314         .ct_item_ops = &comm_ops,
 315         .ct_attrs = comm_attrs,
 316         .ct_owner = THIS_MODULE,
 317 };
 318
 319 static const struct config_item_type nodes_type = {
 320         .ct_group_ops = &nodes_ops,
 321         .ct_owner = THIS_MODULE,
 322 };
 323
 324 static const struct config_item_type node_type = {
 325         .ct_item_ops = &node_ops,
 326         .ct_attrs = node_attrs,
 327         .ct_owner = THIS_MODULE,
 328 };
 329
 330 static struct dlm_space *config_item_to_space(struct config_item *i)
 331 {
 332         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 333                    NULL;
 334 }
 335
 336 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 337 {
 338         return i ? container_of(i, struct dlm_comm, item) : NULL;
 339 }
 340
 341 static struct dlm_node *config_item_to_node(struct config_item *i)
 342 {
 343         return i ? container_of(i, struct dlm_node, item) : NULL;
 344 }
 345
 346 static struct config_group *make_cluster(struct config_group *g,
 347                                          const char *name)
 348 {
 349         struct dlm_cluster *cl = NULL;
 350         struct dlm_spaces *sps = NULL;
 351         struct dlm_comms *cms = NULL;
 352
 353         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 354         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 355         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 356
 357         if (!cl || !sps || !cms)
 358                 goto fail;
 359
 360         cl->sps = sps;
 361         cl->cms = cms;
 362
 363         config_group_init_type_name(&cl->group, name, &cluster_type);
 364         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 365         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 366
 367         configfs_add_default_group(&sps->ss_group, &cl->group);
 368         configfs_add_default_group(&cms->cs_group, &cl->group);
 369
 370         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 371         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 372         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 373         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 374         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 375         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 376         cl->cl_log_debug = dlm_config.ci_log_debug;
 377         cl->cl_log_info = dlm_config.ci_log_info;
 378         cl->cl_protocol = dlm_config.ci_protocol;
 379         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 380         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 381         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 382         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 383         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 384                DLM_LOCKSPACE_LEN);
 385
 386         space_list = &sps->ss_group;
 387         comm_list = &cms->cs_group;
 388         return &cl->group;
 389
 390  fail:
 391         kfree(cl);
 392         kfree(sps);
 393         kfree(cms);
 394         return ERR_PTR(-ENOMEM);
 395 }
 396
 397 static void drop_cluster(struct config_group *g, struct config_item *i)
 398 {
 399         struct dlm_cluster *cl = config_item_to_cluster(i);
 400
 401         configfs_remove_default_groups(&cl->group);
 402
 403         space_list = NULL;
 404         comm_list = NULL;
 405
 406         config_item_put(i);
 407 }
 408
 409 static void release_cluster(struct config_item *i)
 410 {
 411         struct dlm_cluster *cl = config_item_to_cluster(i);
 412
 413         kfree(cl->sps);
 414         kfree(cl->cms);
 415         kfree(cl);
 416 }
 417
 418 static struct config_group *make_space(struct config_group *g, const char *name)
 419 {
 420         struct dlm_space *sp = NULL;
 421         struct dlm_nodes *nds = NULL;
 422
 423         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 424         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 425
 426         if (!sp || !nds)
 427                 goto fail;
 428
 429         config_group_init_type_name(&sp->group, name, &space_type);
 430
 431         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 432         configfs_add_default_group(&nds->ns_group, &sp->group);
 433
 434         INIT_LIST_HEAD(&sp->members);
 435         mutex_init(&sp->members_lock);
 436         sp->members_count = 0;
 437         sp->nds = nds;
 438         return &sp->group;
 439
 440  fail:
 441         kfree(sp);
 442         kfree(nds);
 443         return ERR_PTR(-ENOMEM);
 444 }
 445
 446 static void drop_space(struct config_group *g, struct config_item *i)
 447 {
 448         struct dlm_space *sp = config_item_to_space(i);
 449
 450         /* assert list_empty(&sp->members) */
 451
 452         configfs_remove_default_groups(&sp->group);
 453         config_item_put(i);
 454 }
 455
 456 static void release_space(struct config_item *i)
 457 {
 458         struct dlm_space *sp = config_item_to_space(i);
 459         kfree(sp->nds);
 460         kfree(sp);
 461 }
 462
 463 static struct config_item *make_comm(struct config_group *g, const char *name)
 464 {
 465         struct dlm_comm *cm;
 466
 467         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 468         if (!cm)
 469                 return ERR_PTR(-ENOMEM);
 470
 471         config_item_init_type_name(&cm->item, name, &comm_type);
 472
 473         cm->seq = dlm_comm_count++;
 474         if (!cm->seq)
 475                 cm->seq = dlm_comm_count++;
 476
 477         cm->nodeid = -1;
 478         cm->local = 0;
 479         cm->addr_count = 0;
 480         return &cm->item;
 481 }
 482
 483 static void drop_comm(struct config_group *g, struct config_item *i)
 484 {
 485         struct dlm_comm *cm = config_item_to_comm(i);
 486         if (local_comm == cm)
 487                 local_comm = NULL;
 488         dlm_lowcomms_close(cm->nodeid);
 489         while (cm->addr_count--)
 490                 kfree(cm->addr[cm->addr_count]);
 491         config_item_put(i);
 492 }
 493
 494 static void release_comm(struct config_item *i)
 495 {
 496         struct dlm_comm *cm = config_item_to_comm(i);
 497         kfree(cm);
 498 }
 499
 500 static struct config_item *make_node(struct config_group *g, const char *name)
 501 {
 502         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 503         struct dlm_node *nd;
 504
 505         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 506         if (!nd)
 507                 return ERR_PTR(-ENOMEM);
 508
 509         config_item_init_type_name(&nd->item, name, &node_type);
 510         nd->nodeid = -1;
 511         nd->weight = 1;  /* default weight of 1 if none is set */
 512         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 513
 514         mutex_lock(&sp->members_lock);
 515         list_add(&nd->list, &sp->members);
 516         sp->members_count++;
 517         mutex_unlock(&sp->members_lock);
 518
 519         return &nd->item;
 520 }
 521
 522 static void drop_node(struct config_group *g, struct config_item *i)
 523 {
 524         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 525         struct dlm_node *nd = config_item_to_node(i);
 526
 527         mutex_lock(&sp->members_lock);
 528         list_del(&nd->list);
 529         sp->members_count--;
 530         mutex_unlock(&sp->members_lock);
 531
 532         config_item_put(i);
 533 }
 534
 535 static void release_node(struct config_item *i)
 536 {
 537         struct dlm_node *nd = config_item_to_node(i);
 538         kfree(nd);
 539 }
 540
 541 static struct dlm_clusters clusters_root = {
 542         .subsys = {
 543                 .su_group = {
 544                         .cg_item = {
 545                                 .ci_namebuf = "dlm",
 546                                 .ci_type = &clusters_type,
 547                         },
 548                 },
 549         },
 550 };
 551
 552 int __init dlm_config_init(void)
 553 {
 554         config_group_init(&clusters_root.subsys.su_group);
 555         mutex_init(&clusters_root.subsys.su_mutex);
 556         return configfs_register_subsystem(&clusters_root.subsys);
 557 }
 558
 559 void dlm_config_exit(void)
 560 {
 561         configfs_unregister_subsystem(&clusters_root.subsys);
 562 }
 563
 564 /*
 565  * Functions for user space to read/write attributes
 566  */
 567
 568 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 569 {
 570         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 571 }
 572
 573 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 574                                  size_t len)
 575 {
 576         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 577
 578         if (rc)
 579                 return rc;
 580         return len;
 581 }
 582
 583 static ssize_t comm_local_show(struct config_item *item, char *buf)
 584 {
 585         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 586 }
 587
 588 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 589                                 size_t len)
 590 {
 591         struct dlm_comm *cm = config_item_to_comm(item);
 592         int rc = kstrtoint(buf, 0, &cm->local);
 593
 594         if (rc)
 595                 return rc;
 596         if (cm->local && !local_comm)
 597                 local_comm = cm;
 598         return len;
 599 }
 600
 601 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 602                 size_t len)
 603 {
 604         struct dlm_comm *cm = config_item_to_comm(item);
 605         struct sockaddr_storage *addr;
 606         int rv;
 607
 608         if (len != sizeof(struct sockaddr_storage))
 609                 return -EINVAL;
 610
 611         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 612                 return -ENOSPC;
 613
 614         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 615         if (!addr)
 616                 return -ENOMEM;
 617
 618         memcpy(addr, buf, len);
 619
 620         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 621         if (rv) {
 622                 kfree(addr);
 623                 return rv;
 624         }
 625
 626         cm->addr[cm->addr_count++] = addr;
 627         return len;
 628 }
 629
 630 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 631 {
 632         struct dlm_comm *cm = config_item_to_comm(item);
 633         ssize_t s;
 634         ssize_t allowance;
 635         int i;
 636         struct sockaddr_storage *addr;
 637         struct sockaddr_in *addr_in;
 638         struct sockaddr_in6 *addr_in6;
 639
 640         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 641         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 642
 643
 644         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 645         allowance = 4096;
 646         buf[0] = '\0';
 647
 648         for (i = 0; i < cm->addr_count; i++) {
 649                 addr = cm->addr[i];
 650
 651                 switch(addr->ss_family) {
 652                 case AF_INET:
 653                         addr_in = (struct sockaddr_in *)addr;
 654                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 655                         break;
 656                 case AF_INET6:
 657                         addr_in6 = (struct sockaddr_in6 *)addr;
 658                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 659                         break;
 660                 default:
 661                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 662                         break;
 663                 }
 664                 allowance -= s;
 665                 if (allowance >= 0)
 666                         strcat(buf, buf0);
 667                 else {
 668                         allowance += s;
 669                         break;
 670                 }
 671         }
 672         return 4096 - allowance;
 673 }
 674
 675 CONFIGFS_ATTR(comm_, nodeid);
 676 CONFIGFS_ATTR(comm_, local);
 677 CONFIGFS_ATTR_WO(comm_, addr);
 678 CONFIGFS_ATTR_RO(comm_, addr_list);
 679
 680 static struct configfs_attribute *comm_attrs[] = {
 681         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 682         [COMM_ATTR_LOCAL] = &comm_attr_local,
 683         [COMM_ATTR_ADDR] = &comm_attr_addr,
 684         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 685         NULL,
 686 };
 687
 688 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 689 {
 690         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 691 }
 692
 693 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 694                                  size_t len)
 695 {
 696         struct dlm_node *nd = config_item_to_node(item);
 697         uint32_t seq = 0;
 698         int rc = kstrtoint(buf, 0, &nd->nodeid);
 699
 700         if (rc)
 701                 return rc;
 702         dlm_comm_seq(nd->nodeid, &seq);
 703         nd->comm_seq = seq;
 704         return len;
 705 }
 706
 707 static ssize_t node_weight_show(struct config_item *item, char *buf)
 708 {
 709         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 710 }
 711
 712 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 713                                  size_t len)
 714 {
 715         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 716
 717         if (rc)
 718                 return rc;
 719         return len;
 720 }
 721
 722 CONFIGFS_ATTR(node_, nodeid);
 723 CONFIGFS_ATTR(node_, weight);
 724
 725 static struct configfs_attribute *node_attrs[] = {
 726         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 727         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 728         NULL,
 729 };
 730
 731 /*
 732  * Functions for the dlm to get the info that's been configured
 733  */
 734
 735 static struct dlm_space *get_space(char *name)
 736 {
 737         struct config_item *i;
 738
 739         if (!space_list)
 740                 return NULL;
 741
 742         mutex_lock(&space_list->cg_subsys->su_mutex);
 743         i = config_group_find_item(space_list, name);
 744         mutex_unlock(&space_list->cg_subsys->su_mutex);
 745
 746         return config_item_to_space(i);
 747 }
 748
 749 static void put_space(struct dlm_space *sp)
 750 {
 751         config_item_put(&sp->group.cg_item);
 752 }
 753
 754 static struct dlm_comm *get_comm(int nodeid)
 755 {
 756         struct config_item *i;
 757         struct dlm_comm *cm = NULL;
 758         int found = 0;
 759
 760         if (!comm_list)
 761                 return NULL;
 762
 763         mutex_lock(&clusters_root.subsys.su_mutex);
 764
 765         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 766                 cm = config_item_to_comm(i);
 767
 768                 if (cm->nodeid != nodeid)
 769                         continue;
 770                 found = 1;
 771                 config_item_get(i);
 772                 break;
 773         }
 774         mutex_unlock(&clusters_root.subsys.su_mutex);
 775
 776         if (!found)
 777                 cm = NULL;
 778         return cm;
 779 }
 780
 781 static void put_comm(struct dlm_comm *cm)
 782 {
 783         config_item_put(&cm->item);
 784 }
 785
 786 /* caller must free mem */
 787 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 788                      int *count_out)
 789 {
 790         struct dlm_space *sp;
 791         struct dlm_node *nd;
 792         struct dlm_config_node *nodes, *node;
 793         int rv, count;
 794
 795         sp = get_space(lsname);
 796         if (!sp)
 797                 return -EEXIST;
 798
 799         mutex_lock(&sp->members_lock);
 800         if (!sp->members_count) {
 801                 rv = -EINVAL;
 802                 printk(KERN_ERR "dlm: zero members_count\n");
 803                 goto out;
 804         }
 805
 806         count = sp->members_count;
 807
 808         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 809         if (!nodes) {
 810                 rv = -ENOMEM;
 811                 goto out;
 812         }
 813
 814         node = nodes;
 815         list_for_each_entry(nd, &sp->members, list) {
 816                 node->nodeid = nd->nodeid;
 817                 node->weight = nd->weight;
 818                 node->new = nd->new;
 819                 node->comm_seq = nd->comm_seq;
 820                 node++;
 821
 822                 nd->new = 0;
 823         }
 824
 825         *count_out = count;
 826         *nodes_out = nodes;
 827         rv = 0;
 828  out:
 829         mutex_unlock(&sp->members_lock);
 830         put_space(sp);
 831         return rv;
 832 }
 833
 834 int dlm_comm_seq(int nodeid, uint32_t *seq)
 835 {
 836         struct dlm_comm *cm = get_comm(nodeid);
 837         if (!cm)
 838                 return -EEXIST;
 839         *seq = cm->seq;
 840         put_comm(cm);
 841         return 0;
 842 }
 843
 844 int dlm_our_nodeid(void)
 845 {
 846         return local_comm ? local_comm->nodeid : 0;
 847 }
 848
 849 /* num 0 is first addr, num 1 is second addr */
 850 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 851 {
 852         if (!local_comm)
 853                 return -1;
 854         if (num + 1 > local_comm->addr_count)
 855                 return -1;
 856         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 857         return 0;
 858 }
 859
 860 /* Config file defaults */
 861 #define DEFAULT_TCP_PORT       21064
 862 #define DEFAULT_BUFFER_SIZE     4096
 863 #define DEFAULT_RSBTBL_SIZE     1024
 864 #define DEFAULT_RECOVER_TIMER      5
 865 #define DEFAULT_TOSS_SECS         10
 866 #define DEFAULT_SCAN_SECS          5
 867 #define DEFAULT_LOG_DEBUG          0
 868 #define DEFAULT_LOG_INFO           1
 869 #define DEFAULT_PROTOCOL           0
 870 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 871 #define DEFAULT_WAITWARN_US        0
 872 #define DEFAULT_NEW_RSB_COUNT    128
 873 #define DEFAULT_RECOVER_CALLBACKS  0
 874 #define DEFAULT_CLUSTER_NAME      ""
 875
 876 struct dlm_config_info dlm_config = {
 877         .ci_tcp_port = DEFAULT_TCP_PORT,
 878         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 879         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 880         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 881         .ci_toss_secs = DEFAULT_TOSS_SECS,
 882         .ci_scan_secs = DEFAULT_SCAN_SECS,
 883         .ci_log_debug = DEFAULT_LOG_DEBUG,
 884         .ci_log_info = DEFAULT_LOG_INFO,
 885         .ci_protocol = DEFAULT_PROTOCOL,
 886         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 887         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 888         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 889         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 890         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 891 };
 892