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 "midcomms.h"
  24 #include "lowcomms.h"
  25
  26 /*
  27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid (refers to <node>)
  28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  29  * /config/dlm/<cluster>/comms/<comm>/nodeid (refers to <comm>)
  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 static uint32_t dlm_comm_count;
  40
  41 struct dlm_clusters;
  42 struct dlm_cluster;
  43 struct dlm_spaces;
  44 struct dlm_space;
  45 struct dlm_comms;
  46 struct dlm_comm;
  47 struct dlm_nodes;
  48 struct dlm_node;
  49
  50 static struct config_group *make_cluster(struct config_group *, const char *);
  51 static void drop_cluster(struct config_group *, struct config_item *);
  52 static void release_cluster(struct config_item *);
  53 static struct config_group *make_space(struct config_group *, const char *);
  54 static void drop_space(struct config_group *, struct config_item *);
  55 static void release_space(struct config_item *);
  56 static struct config_item *make_comm(struct config_group *, const char *);
  57 static void drop_comm(struct config_group *, struct config_item *);
  58 static void release_comm(struct config_item *);
  59 static struct config_item *make_node(struct config_group *, const char *);
  60 static void drop_node(struct config_group *, struct config_item *);
  61 static void release_node(struct config_item *);
  62
  63 static struct configfs_attribute *comm_attrs[];
  64 static struct configfs_attribute *node_attrs[];
  65
  66 const struct rhashtable_params dlm_rhash_rsb_params = {
  67         .nelem_hint = 3, /* start small */
  68         .key_len = DLM_RESNAME_MAXLEN,
  69         .key_offset = offsetof(struct dlm_rsb, res_name),
  70         .head_offset = offsetof(struct dlm_rsb, res_node),
  71         .automatic_shrinking = true,
  72 };
  73
  74 struct dlm_cluster {
  75         struct config_group group;
  76         struct dlm_spaces *sps;
  77         struct dlm_comms *cms;
  78 };
  79
  80 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  81 {
  82         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  83                    NULL;
  84 }
  85
  86 enum {
  87         CLUSTER_ATTR_TCP_PORT = 0,
  88         CLUSTER_ATTR_BUFFER_SIZE,
  89         CLUSTER_ATTR_RSBTBL_SIZE,
  90         CLUSTER_ATTR_RECOVER_TIMER,
  91         CLUSTER_ATTR_TOSS_SECS,
  92         CLUSTER_ATTR_SCAN_SECS,
  93         CLUSTER_ATTR_LOG_DEBUG,
  94         CLUSTER_ATTR_LOG_INFO,
  95         CLUSTER_ATTR_PROTOCOL,
  96         CLUSTER_ATTR_MARK,
  97         CLUSTER_ATTR_NEW_RSB_COUNT,
  98         CLUSTER_ATTR_RECOVER_CALLBACKS,
  99         CLUSTER_ATTR_CLUSTER_NAME,
 100 };
 101
 102 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
 103 {
 104         return sprintf(buf, "%s\n", dlm_config.ci_cluster_name);
 105 }
 106
 107 static ssize_t cluster_cluster_name_store(struct config_item *item,
 108                                           const char *buf, size_t len)
 109 {
 110         strscpy(dlm_config.ci_cluster_name, buf,
 111                 sizeof(dlm_config.ci_cluster_name));
 112         return len;
 113 }
 114
 115 CONFIGFS_ATTR(cluster_, cluster_name);
 116
 117 static ssize_t cluster_tcp_port_show(struct config_item *item, char *buf)
 118 {
 119         return sprintf(buf, "%u\n", be16_to_cpu(dlm_config.ci_tcp_port));
 120 }
 121
 122 static int dlm_check_zero_and_dlm_running(unsigned int x)
 123 {
 124         if (!x)
 125                 return -EINVAL;
 126
 127         if (dlm_lowcomms_is_running())
 128                 return -EBUSY;
 129
 130         return 0;
 131 }
 132
 133 static ssize_t cluster_tcp_port_store(struct config_item *item,
 134                                       const char *buf, size_t len)
 135 {
 136         int rc;
 137         u16 x;
 138
 139         if (!capable(CAP_SYS_ADMIN))
 140                 return -EPERM;
 141
 142         rc = kstrtou16(buf, 0, &x);
 143         if (rc)
 144                 return rc;
 145
 146         rc = dlm_check_zero_and_dlm_running(x);
 147         if (rc)
 148                 return rc;
 149
 150         dlm_config.ci_tcp_port = cpu_to_be16(x);
 151         return len;
 152 }
 153
 154 CONFIGFS_ATTR(cluster_, tcp_port);
 155
 156 static ssize_t cluster_set(unsigned int *info_field,
 157                            int (*check_cb)(unsigned int x),
 158                            const char *buf, size_t len)
 159 {
 160         unsigned int x;
 161         int rc;
 162
 163         if (!capable(CAP_SYS_ADMIN))
 164                 return -EPERM;
 165         rc = kstrtouint(buf, 0, &x);
 166         if (rc)
 167                 return rc;
 168
 169         if (check_cb) {
 170                 rc = check_cb(x);
 171                 if (rc)
 172                         return rc;
 173         }
 174
 175         *info_field = x;
 176
 177         return len;
 178 }
 179
 180 #define CLUSTER_ATTR(name, check_cb)                                          \
 181 static ssize_t cluster_##name##_store(struct config_item *item, \
 182                 const char *buf, size_t len) \
 183 {                                                                             \
 184         return cluster_set(&dlm_config.ci_##name, check_cb, buf, len);        \
 185 }                                                                             \
 186 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 187 {                                                                             \
 188         return snprintf(buf, PAGE_SIZE, "%u\n", dlm_config.ci_##name);        \
 189 }                                                                             \
 190 CONFIGFS_ATTR(cluster_, name);
 191
 192 static int dlm_check_protocol_and_dlm_running(unsigned int x)
 193 {
 194         switch (x) {
 195         case 0:
 196                 /* TCP */
 197                 break;
 198         case 1:
 199                 /* SCTP */
 200                 if (!IS_ENABLED(CONFIG_IP_SCTP))
 201                         return -EOPNOTSUPP;
 202
 203                 break;
 204         default:
 205                 return -EINVAL;
 206         }
 207
 208         if (dlm_lowcomms_is_running())
 209                 return -EBUSY;
 210
 211         return 0;
 212 }
 213
 214 static int dlm_check_zero(unsigned int x)
 215 {
 216         if (!x)
 217                 return -EINVAL;
 218
 219         return 0;
 220 }
 221
 222 static int dlm_check_buffer_size(unsigned int x)
 223 {
 224         if (x < DLM_MAX_SOCKET_BUFSIZE)
 225                 return -EINVAL;
 226
 227         return 0;
 228 }
 229
 230 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
 231 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
 232 CLUSTER_ATTR(recover_timer, dlm_check_zero);
 233 CLUSTER_ATTR(toss_secs, dlm_check_zero);
 234 CLUSTER_ATTR(scan_secs, dlm_check_zero);
 235 CLUSTER_ATTR(log_debug, NULL);
 236 CLUSTER_ATTR(log_info, NULL);
 237 CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
 238 CLUSTER_ATTR(mark, NULL);
 239 CLUSTER_ATTR(new_rsb_count, NULL);
 240 CLUSTER_ATTR(recover_callbacks, NULL);
 241
 242 static struct configfs_attribute *cluster_attrs[] = {
 243         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 244         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 245         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 246         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 247         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 248         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 249         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 250         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 251         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 252         [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
 253         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 254         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 255         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 256         NULL,
 257 };
 258
 259 enum {
 260         COMM_ATTR_NODEID = 0,
 261         COMM_ATTR_LOCAL,
 262         COMM_ATTR_ADDR,
 263         COMM_ATTR_ADDR_LIST,
 264         COMM_ATTR_MARK,
 265 };
 266
 267 enum {
 268         NODE_ATTR_NODEID = 0,
 269         NODE_ATTR_WEIGHT,
 270 };
 271
 272 struct dlm_clusters {
 273         struct configfs_subsystem subsys;
 274 };
 275
 276 struct dlm_spaces {
 277         struct config_group ss_group;
 278 };
 279
 280 struct dlm_space {
 281         struct config_group group;
 282         struct list_head members;
 283         struct mutex members_lock;
 284         int members_count;
 285         struct dlm_nodes *nds;
 286 };
 287
 288 struct dlm_comms {
 289         struct config_group cs_group;
 290 };
 291
 292 struct dlm_comm {
 293         struct config_item item;
 294         int seq;
 295         int nodeid;
 296         int local;
 297         int addr_count;
 298         unsigned int mark;
 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         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 313 };
 314
 315 static struct configfs_group_operations clusters_ops = {
 316         .make_group = make_cluster,
 317         .drop_item = drop_cluster,
 318 };
 319
 320 static struct configfs_item_operations cluster_ops = {
 321         .release = release_cluster,
 322 };
 323
 324 static struct configfs_group_operations spaces_ops = {
 325         .make_group = make_space,
 326         .drop_item = drop_space,
 327 };
 328
 329 static struct configfs_item_operations space_ops = {
 330         .release = release_space,
 331 };
 332
 333 static struct configfs_group_operations comms_ops = {
 334         .make_item = make_comm,
 335         .drop_item = drop_comm,
 336 };
 337
 338 static struct configfs_item_operations comm_ops = {
 339         .release = release_comm,
 340 };
 341
 342 static struct configfs_group_operations nodes_ops = {
 343         .make_item = make_node,
 344         .drop_item = drop_node,
 345 };
 346
 347 static struct configfs_item_operations node_ops = {
 348         .release = release_node,
 349 };
 350
 351 static const struct config_item_type clusters_type = {
 352         .ct_group_ops = &clusters_ops,
 353         .ct_owner = THIS_MODULE,
 354 };
 355
 356 static const struct config_item_type cluster_type = {
 357         .ct_item_ops = &cluster_ops,
 358         .ct_attrs = cluster_attrs,
 359         .ct_owner = THIS_MODULE,
 360 };
 361
 362 static const struct config_item_type spaces_type = {
 363         .ct_group_ops = &spaces_ops,
 364         .ct_owner = THIS_MODULE,
 365 };
 366
 367 static const struct config_item_type space_type = {
 368         .ct_item_ops = &space_ops,
 369         .ct_owner = THIS_MODULE,
 370 };
 371
 372 static const struct config_item_type comms_type = {
 373         .ct_group_ops = &comms_ops,
 374         .ct_owner = THIS_MODULE,
 375 };
 376
 377 static const struct config_item_type comm_type = {
 378         .ct_item_ops = &comm_ops,
 379         .ct_attrs = comm_attrs,
 380         .ct_owner = THIS_MODULE,
 381 };
 382
 383 static const struct config_item_type nodes_type = {
 384         .ct_group_ops = &nodes_ops,
 385         .ct_owner = THIS_MODULE,
 386 };
 387
 388 static const struct config_item_type node_type = {
 389         .ct_item_ops = &node_ops,
 390         .ct_attrs = node_attrs,
 391         .ct_owner = THIS_MODULE,
 392 };
 393
 394 static struct dlm_space *config_item_to_space(struct config_item *i)
 395 {
 396         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 397                    NULL;
 398 }
 399
 400 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 401 {
 402         return i ? container_of(i, struct dlm_comm, item) : NULL;
 403 }
 404
 405 static struct dlm_node *config_item_to_node(struct config_item *i)
 406 {
 407         return i ? container_of(i, struct dlm_node, item) : NULL;
 408 }
 409
 410 static struct config_group *make_cluster(struct config_group *g,
 411                                          const char *name)
 412 {
 413         struct dlm_cluster *cl = NULL;
 414         struct dlm_spaces *sps = NULL;
 415         struct dlm_comms *cms = NULL;
 416
 417         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 418         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 419         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 420
 421         if (!cl || !sps || !cms)
 422                 goto fail;
 423
 424         cl->sps = sps;
 425         cl->cms = cms;
 426
 427         config_group_init_type_name(&cl->group, name, &cluster_type);
 428         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 429         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 430
 431         configfs_add_default_group(&sps->ss_group, &cl->group);
 432         configfs_add_default_group(&cms->cs_group, &cl->group);
 433
 434         space_list = &sps->ss_group;
 435         comm_list = &cms->cs_group;
 436         return &cl->group;
 437
 438  fail:
 439         kfree(cl);
 440         kfree(sps);
 441         kfree(cms);
 442         return ERR_PTR(-ENOMEM);
 443 }
 444
 445 static void drop_cluster(struct config_group *g, struct config_item *i)
 446 {
 447         struct dlm_cluster *cl = config_item_to_cluster(i);
 448
 449         configfs_remove_default_groups(&cl->group);
 450
 451         space_list = NULL;
 452         comm_list = NULL;
 453
 454         config_item_put(i);
 455 }
 456
 457 static void release_cluster(struct config_item *i)
 458 {
 459         struct dlm_cluster *cl = config_item_to_cluster(i);
 460
 461         kfree(cl->sps);
 462         kfree(cl->cms);
 463         kfree(cl);
 464 }
 465
 466 static struct config_group *make_space(struct config_group *g, const char *name)
 467 {
 468         struct dlm_space *sp = NULL;
 469         struct dlm_nodes *nds = NULL;
 470
 471         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 472         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 473
 474         if (!sp || !nds)
 475                 goto fail;
 476
 477         config_group_init_type_name(&sp->group, name, &space_type);
 478
 479         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 480         configfs_add_default_group(&nds->ns_group, &sp->group);
 481
 482         INIT_LIST_HEAD(&sp->members);
 483         mutex_init(&sp->members_lock);
 484         sp->members_count = 0;
 485         sp->nds = nds;
 486         return &sp->group;
 487
 488  fail:
 489         kfree(sp);
 490         kfree(nds);
 491         return ERR_PTR(-ENOMEM);
 492 }
 493
 494 static void drop_space(struct config_group *g, struct config_item *i)
 495 {
 496         struct dlm_space *sp = config_item_to_space(i);
 497
 498         /* assert list_empty(&sp->members) */
 499
 500         configfs_remove_default_groups(&sp->group);
 501         config_item_put(i);
 502 }
 503
 504 static void release_space(struct config_item *i)
 505 {
 506         struct dlm_space *sp = config_item_to_space(i);
 507         kfree(sp->nds);
 508         kfree(sp);
 509 }
 510
 511 static struct config_item *make_comm(struct config_group *g, const char *name)
 512 {
 513         struct dlm_comm *cm;
 514         unsigned int nodeid;
 515         int rv;
 516
 517         rv = kstrtouint(name, 0, &nodeid);
 518         if (rv)
 519                 return ERR_PTR(rv);
 520
 521         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 522         if (!cm)
 523                 return ERR_PTR(-ENOMEM);
 524
 525         config_item_init_type_name(&cm->item, name, &comm_type);
 526
 527         cm->seq = dlm_comm_count++;
 528         if (!cm->seq)
 529                 cm->seq = dlm_comm_count++;
 530
 531         cm->nodeid = nodeid;
 532         cm->local = 0;
 533         cm->addr_count = 0;
 534         cm->mark = 0;
 535         return &cm->item;
 536 }
 537
 538 static void drop_comm(struct config_group *g, struct config_item *i)
 539 {
 540         struct dlm_comm *cm = config_item_to_comm(i);
 541         if (local_comm == cm)
 542                 local_comm = NULL;
 543         dlm_midcomms_close(cm->nodeid);
 544         while (cm->addr_count--)
 545                 kfree(cm->addr[cm->addr_count]);
 546         config_item_put(i);
 547 }
 548
 549 static void release_comm(struct config_item *i)
 550 {
 551         struct dlm_comm *cm = config_item_to_comm(i);
 552         kfree(cm);
 553 }
 554
 555 static struct config_item *make_node(struct config_group *g, const char *name)
 556 {
 557         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 558         unsigned int nodeid;
 559         struct dlm_node *nd;
 560         uint32_t seq = 0;
 561         int rv;
 562
 563         rv = kstrtouint(name, 0, &nodeid);
 564         if (rv)
 565                 return ERR_PTR(rv);
 566
 567         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 568         if (!nd)
 569                 return ERR_PTR(-ENOMEM);
 570
 571         config_item_init_type_name(&nd->item, name, &node_type);
 572         nd->nodeid = nodeid;
 573         nd->weight = 1;  /* default weight of 1 if none is set */
 574         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 575         dlm_comm_seq(nodeid, &seq, true);
 576         nd->comm_seq = seq;
 577
 578         mutex_lock(&sp->members_lock);
 579         list_add(&nd->list, &sp->members);
 580         sp->members_count++;
 581         mutex_unlock(&sp->members_lock);
 582
 583         return &nd->item;
 584 }
 585
 586 static void drop_node(struct config_group *g, struct config_item *i)
 587 {
 588         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 589         struct dlm_node *nd = config_item_to_node(i);
 590
 591         mutex_lock(&sp->members_lock);
 592         list_del(&nd->list);
 593         sp->members_count--;
 594         mutex_unlock(&sp->members_lock);
 595
 596         config_item_put(i);
 597 }
 598
 599 static void release_node(struct config_item *i)
 600 {
 601         struct dlm_node *nd = config_item_to_node(i);
 602         kfree(nd);
 603 }
 604
 605 static struct dlm_clusters clusters_root = {
 606         .subsys = {
 607                 .su_group = {
 608                         .cg_item = {
 609                                 .ci_namebuf = "dlm",
 610                                 .ci_type = &clusters_type,
 611                         },
 612                 },
 613         },
 614 };
 615
 616 int __init dlm_config_init(void)
 617 {
 618         config_group_init(&clusters_root.subsys.su_group);
 619         mutex_init(&clusters_root.subsys.su_mutex);
 620         return configfs_register_subsystem(&clusters_root.subsys);
 621 }
 622
 623 void dlm_config_exit(void)
 624 {
 625         configfs_unregister_subsystem(&clusters_root.subsys);
 626 }
 627
 628 /*
 629  * Functions for user space to read/write attributes
 630  */
 631
 632 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 633 {
 634         unsigned int nodeid;
 635         int rv;
 636
 637         rv = kstrtouint(config_item_name(item), 0, &nodeid);
 638         if (WARN_ON(rv))
 639                 return rv;
 640
 641         return sprintf(buf, "%u\n", nodeid);
 642 }
 643
 644 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 645                                  size_t len)
 646 {
 647         return len;
 648 }
 649
 650 static ssize_t comm_local_show(struct config_item *item, char *buf)
 651 {
 652         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 653 }
 654
 655 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 656                                 size_t len)
 657 {
 658         struct dlm_comm *cm = config_item_to_comm(item);
 659         int rc = kstrtoint(buf, 0, &cm->local);
 660
 661         if (rc)
 662                 return rc;
 663         if (cm->local && !local_comm)
 664                 local_comm = cm;
 665         return len;
 666 }
 667
 668 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 669                 size_t len)
 670 {
 671         struct dlm_comm *cm = config_item_to_comm(item);
 672         struct sockaddr_storage *addr;
 673         int rv;
 674
 675         if (len != sizeof(struct sockaddr_storage))
 676                 return -EINVAL;
 677
 678         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 679                 return -ENOSPC;
 680
 681         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 682         if (!addr)
 683                 return -ENOMEM;
 684
 685         memcpy(addr, buf, len);
 686
 687         rv = dlm_midcomms_addr(cm->nodeid, addr);
 688         if (rv) {
 689                 kfree(addr);
 690                 return rv;
 691         }
 692
 693         cm->addr[cm->addr_count++] = addr;
 694         return len;
 695 }
 696
 697 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 698 {
 699         struct dlm_comm *cm = config_item_to_comm(item);
 700         ssize_t s;
 701         ssize_t allowance;
 702         int i;
 703         struct sockaddr_storage *addr;
 704         struct sockaddr_in *addr_in;
 705         struct sockaddr_in6 *addr_in6;
 706
 707         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 708         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 709
 710
 711         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 712         allowance = 4096;
 713         buf[0] = '\0';
 714
 715         for (i = 0; i < cm->addr_count; i++) {
 716                 addr = cm->addr[i];
 717
 718                 switch(addr->ss_family) {
 719                 case AF_INET:
 720                         addr_in = (struct sockaddr_in *)addr;
 721                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 722                         break;
 723                 case AF_INET6:
 724                         addr_in6 = (struct sockaddr_in6 *)addr;
 725                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 726                         break;
 727                 default:
 728                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 729                         break;
 730                 }
 731                 allowance -= s;
 732                 if (allowance >= 0)
 733                         strcat(buf, buf0);
 734                 else {
 735                         allowance += s;
 736                         break;
 737                 }
 738         }
 739         return 4096 - allowance;
 740 }
 741
 742 static ssize_t comm_mark_show(struct config_item *item, char *buf)
 743 {
 744         return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
 745 }
 746
 747 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
 748                                size_t len)
 749 {
 750         struct dlm_comm *comm;
 751         unsigned int mark;
 752         int rc;
 753
 754         rc = kstrtouint(buf, 0, &mark);
 755         if (rc)
 756                 return rc;
 757
 758         if (mark == 0)
 759                 mark = dlm_config.ci_mark;
 760
 761         comm = config_item_to_comm(item);
 762         rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
 763         if (rc)
 764                 return rc;
 765
 766         comm->mark = mark;
 767         return len;
 768 }
 769
 770 CONFIGFS_ATTR(comm_, nodeid);
 771 CONFIGFS_ATTR(comm_, local);
 772 CONFIGFS_ATTR(comm_, mark);
 773 CONFIGFS_ATTR_WO(comm_, addr);
 774 CONFIGFS_ATTR_RO(comm_, addr_list);
 775
 776 static struct configfs_attribute *comm_attrs[] = {
 777         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 778         [COMM_ATTR_LOCAL] = &comm_attr_local,
 779         [COMM_ATTR_ADDR] = &comm_attr_addr,
 780         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 781         [COMM_ATTR_MARK] = &comm_attr_mark,
 782         NULL,
 783 };
 784
 785 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 786 {
 787         unsigned int nodeid;
 788         int rv;
 789
 790         rv = kstrtouint(config_item_name(item), 0, &nodeid);
 791         if (WARN_ON(rv))
 792                 return rv;
 793
 794         return sprintf(buf, "%u\n", nodeid);
 795 }
 796
 797 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 798                                  size_t len)
 799 {
 800         return len;
 801 }
 802
 803 static ssize_t node_weight_show(struct config_item *item, char *buf)
 804 {
 805         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 806 }
 807
 808 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 809                                  size_t len)
 810 {
 811         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 812
 813         if (rc)
 814                 return rc;
 815         return len;
 816 }
 817
 818 CONFIGFS_ATTR(node_, nodeid);
 819 CONFIGFS_ATTR(node_, weight);
 820
 821 static struct configfs_attribute *node_attrs[] = {
 822         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 823         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 824         NULL,
 825 };
 826
 827 /*
 828  * Functions for the dlm to get the info that's been configured
 829  */
 830
 831 static struct dlm_space *get_space(char *name)
 832 {
 833         struct config_item *i;
 834
 835         if (!space_list)
 836                 return NULL;
 837
 838         mutex_lock(&space_list->cg_subsys->su_mutex);
 839         i = config_group_find_item(space_list, name);
 840         mutex_unlock(&space_list->cg_subsys->su_mutex);
 841
 842         return config_item_to_space(i);
 843 }
 844
 845 static void put_space(struct dlm_space *sp)
 846 {
 847         config_item_put(&sp->group.cg_item);
 848 }
 849
 850 static struct dlm_comm *get_comm(int nodeid)
 851 {
 852         struct config_item *i;
 853         struct dlm_comm *cm = NULL;
 854         int found = 0;
 855
 856         if (!comm_list)
 857                 return NULL;
 858
 859         WARN_ON_ONCE(!mutex_is_locked(&clusters_root.subsys.su_mutex));
 860
 861         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 862                 cm = config_item_to_comm(i);
 863
 864                 if (cm->nodeid != nodeid)
 865                         continue;
 866                 found = 1;
 867                 config_item_get(i);
 868                 break;
 869         }
 870
 871         if (!found)
 872                 cm = NULL;
 873         return cm;
 874 }
 875
 876 static void put_comm(struct dlm_comm *cm)
 877 {
 878         config_item_put(&cm->item);
 879 }
 880
 881 /* caller must free mem */
 882 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 883                      int *count_out)
 884 {
 885         struct dlm_space *sp;
 886         struct dlm_node *nd;
 887         struct dlm_config_node *nodes, *node;
 888         int rv, count;
 889
 890         sp = get_space(lsname);
 891         if (!sp)
 892                 return -EEXIST;
 893
 894         mutex_lock(&sp->members_lock);
 895         if (!sp->members_count) {
 896                 rv = -EINVAL;
 897                 printk(KERN_ERR "dlm: zero members_count\n");
 898                 goto out;
 899         }
 900
 901         count = sp->members_count;
 902
 903         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 904         if (!nodes) {
 905                 rv = -ENOMEM;
 906                 goto out;
 907         }
 908
 909         node = nodes;
 910         list_for_each_entry(nd, &sp->members, list) {
 911                 node->nodeid = nd->nodeid;
 912                 node->weight = nd->weight;
 913                 node->new = nd->new;
 914                 node->comm_seq = nd->comm_seq;
 915                 node++;
 916
 917                 nd->new = 0;
 918         }
 919
 920         *count_out = count;
 921         *nodes_out = nodes;
 922         rv = 0;
 923  out:
 924         mutex_unlock(&sp->members_lock);
 925         put_space(sp);
 926         return rv;
 927 }
 928
 929 int dlm_comm_seq(int nodeid, uint32_t *seq, bool locked)
 930 {
 931         struct dlm_comm *cm;
 932
 933         if (locked) {
 934                 cm = get_comm(nodeid);
 935         } else {
 936                 mutex_lock(&clusters_root.subsys.su_mutex);
 937                 cm = get_comm(nodeid);
 938                 mutex_unlock(&clusters_root.subsys.su_mutex);
 939         }
 940         if (!cm)
 941                 return -ENOENT;
 942
 943         *seq = cm->seq;
 944         put_comm(cm);
 945         return 0;
 946 }
 947
 948 int dlm_our_nodeid(void)
 949 {
 950         return local_comm->nodeid;
 951 }
 952
 953 /* num 0 is first addr, num 1 is second addr */
 954 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 955 {
 956         if (!local_comm)
 957                 return -1;
 958         if (num + 1 > local_comm->addr_count)
 959                 return -1;
 960         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 961         return 0;
 962 }
 963
 964 /* Config file defaults */
 965 #define DEFAULT_TCP_PORT       21064
 966 #define DEFAULT_RSBTBL_SIZE     1024
 967 #define DEFAULT_RECOVER_TIMER      5
 968 #define DEFAULT_TOSS_SECS         10
 969 #define DEFAULT_SCAN_SECS          5
 970 #define DEFAULT_LOG_DEBUG          0
 971 #define DEFAULT_LOG_INFO           1
 972 #define DEFAULT_PROTOCOL           DLM_PROTO_TCP
 973 #define DEFAULT_MARK               0
 974 #define DEFAULT_NEW_RSB_COUNT    128
 975 #define DEFAULT_RECOVER_CALLBACKS  0
 976 #define DEFAULT_CLUSTER_NAME      ""
 977
 978 struct dlm_config_info dlm_config = {
 979         .ci_tcp_port = cpu_to_be16(DEFAULT_TCP_PORT),
 980         .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
 981         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 982         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 983         .ci_toss_secs = DEFAULT_TOSS_SECS,
 984         .ci_scan_secs = DEFAULT_SCAN_SECS,
 985         .ci_log_debug = DEFAULT_LOG_DEBUG,
 986         .ci_log_info = DEFAULT_LOG_INFO,
 987         .ci_protocol = DEFAULT_PROTOCOL,
 988         .ci_mark = DEFAULT_MARK,
 989         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 990         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 991         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 992 };
 993