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
  28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  29  * /config/dlm/<cluster>/comms/<comm>/nodeid
  30  * /config/dlm/<cluster>/comms/<comm>/local
  31  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  32  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  33  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  34  */
  35
  36 static struct config_group *space_list;
  37 static struct config_group *comm_list;
  38 static struct dlm_comm *local_comm;
  39 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         unsigned int cl_tcp_port;
  77         unsigned int cl_buffer_size;
  78         unsigned int cl_rsbtbl_size;
  79         unsigned int cl_recover_timer;
  80         unsigned int cl_toss_secs;
  81         unsigned int cl_scan_secs;
  82         unsigned int cl_log_debug;
  83         unsigned int cl_log_info;
  84         unsigned int cl_protocol;
  85         unsigned int cl_mark;
  86         unsigned int cl_new_rsb_count;
  87         unsigned int cl_recover_callbacks;
  88         char cl_cluster_name[DLM_LOCKSPACE_LEN];
  89
  90         struct dlm_spaces *sps;
  91         struct dlm_comms *cms;
  92 };
  93
  94 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  95 {
  96         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  97                    NULL;
  98 }
  99
 100 enum {
 101         CLUSTER_ATTR_TCP_PORT = 0,
 102         CLUSTER_ATTR_BUFFER_SIZE,
 103         CLUSTER_ATTR_RSBTBL_SIZE,
 104         CLUSTER_ATTR_RECOVER_TIMER,
 105         CLUSTER_ATTR_TOSS_SECS,
 106         CLUSTER_ATTR_SCAN_SECS,
 107         CLUSTER_ATTR_LOG_DEBUG,
 108         CLUSTER_ATTR_LOG_INFO,
 109         CLUSTER_ATTR_PROTOCOL,
 110         CLUSTER_ATTR_MARK,
 111         CLUSTER_ATTR_NEW_RSB_COUNT,
 112         CLUSTER_ATTR_RECOVER_CALLBACKS,
 113         CLUSTER_ATTR_CLUSTER_NAME,
 114 };
 115
 116 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
 117 {
 118         struct dlm_cluster *cl = config_item_to_cluster(item);
 119         return sprintf(buf, "%s\n", cl->cl_cluster_name);
 120 }
 121
 122 static ssize_t cluster_cluster_name_store(struct config_item *item,
 123                                           const char *buf, size_t len)
 124 {
 125         struct dlm_cluster *cl = config_item_to_cluster(item);
 126
 127         strscpy(dlm_config.ci_cluster_name, buf,
 128                                 sizeof(dlm_config.ci_cluster_name));
 129         strscpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
 130         return len;
 131 }
 132
 133 CONFIGFS_ATTR(cluster_, cluster_name);
 134
 135 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 136                            int *info_field, int (*check_cb)(unsigned int x),
 137                            const char *buf, size_t len)
 138 {
 139         unsigned int x;
 140         int rc;
 141
 142         if (!capable(CAP_SYS_ADMIN))
 143                 return -EPERM;
 144         rc = kstrtouint(buf, 0, &x);
 145         if (rc)
 146                 return rc;
 147
 148         if (check_cb) {
 149                 rc = check_cb(x);
 150                 if (rc)
 151                         return rc;
 152         }
 153
 154         *cl_field = x;
 155         *info_field = x;
 156
 157         return len;
 158 }
 159
 160 #define CLUSTER_ATTR(name, check_cb)                                          \
 161 static ssize_t cluster_##name##_store(struct config_item *item, \
 162                 const char *buf, size_t len) \
 163 {                                                                             \
 164         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 165         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 166                            check_cb, buf, len);                               \
 167 }                                                                             \
 168 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 169 {                                                                             \
 170         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 171         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 172 }                                                                             \
 173 CONFIGFS_ATTR(cluster_, name);
 174
 175 static int dlm_check_protocol_and_dlm_running(unsigned int x)
 176 {
 177         switch (x) {
 178         case 0:
 179                 /* TCP */
 180                 break;
 181         case 1:
 182                 /* SCTP */
 183                 break;
 184         default:
 185                 return -EINVAL;
 186         }
 187
 188         if (dlm_lowcomms_is_running())
 189                 return -EBUSY;
 190
 191         return 0;
 192 }
 193
 194 static int dlm_check_zero_and_dlm_running(unsigned int x)
 195 {
 196         if (!x)
 197                 return -EINVAL;
 198
 199         if (dlm_lowcomms_is_running())
 200                 return -EBUSY;
 201
 202         return 0;
 203 }
 204
 205 static int dlm_check_zero(unsigned int x)
 206 {
 207         if (!x)
 208                 return -EINVAL;
 209
 210         return 0;
 211 }
 212
 213 static int dlm_check_buffer_size(unsigned int x)
 214 {
 215         if (x < DLM_MAX_SOCKET_BUFSIZE)
 216                 return -EINVAL;
 217
 218         return 0;
 219 }
 220
 221 CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
 222 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
 223 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
 224 CLUSTER_ATTR(recover_timer, dlm_check_zero);
 225 CLUSTER_ATTR(toss_secs, dlm_check_zero);
 226 CLUSTER_ATTR(scan_secs, dlm_check_zero);
 227 CLUSTER_ATTR(log_debug, NULL);
 228 CLUSTER_ATTR(log_info, NULL);
 229 CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
 230 CLUSTER_ATTR(mark, NULL);
 231 CLUSTER_ATTR(new_rsb_count, NULL);
 232 CLUSTER_ATTR(recover_callbacks, NULL);
 233
 234 static struct configfs_attribute *cluster_attrs[] = {
 235         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 236         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 237         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 238         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 239         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 240         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 241         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 242         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 243         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 244         [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
 245         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 246         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 247         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 248         NULL,
 249 };
 250
 251 enum {
 252         COMM_ATTR_NODEID = 0,
 253         COMM_ATTR_LOCAL,
 254         COMM_ATTR_ADDR,
 255         COMM_ATTR_ADDR_LIST,
 256         COMM_ATTR_MARK,
 257 };
 258
 259 enum {
 260         NODE_ATTR_NODEID = 0,
 261         NODE_ATTR_WEIGHT,
 262 };
 263
 264 struct dlm_clusters {
 265         struct configfs_subsystem subsys;
 266 };
 267
 268 struct dlm_spaces {
 269         struct config_group ss_group;
 270 };
 271
 272 struct dlm_space {
 273         struct config_group group;
 274         struct list_head members;
 275         struct mutex members_lock;
 276         int members_count;
 277         struct dlm_nodes *nds;
 278 };
 279
 280 struct dlm_comms {
 281         struct config_group cs_group;
 282 };
 283
 284 struct dlm_comm {
 285         struct config_item item;
 286         int seq;
 287         int nodeid;
 288         int local;
 289         int addr_count;
 290         unsigned int mark;
 291         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 292 };
 293
 294 struct dlm_nodes {
 295         struct config_group ns_group;
 296 };
 297
 298 struct dlm_node {
 299         struct config_item item;
 300         struct list_head list; /* space->members */
 301         int nodeid;
 302         int weight;
 303         int new;
 304         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 305 };
 306
 307 static struct configfs_group_operations clusters_ops = {
 308         .make_group = make_cluster,
 309         .drop_item = drop_cluster,
 310 };
 311
 312 static struct configfs_item_operations cluster_ops = {
 313         .release = release_cluster,
 314 };
 315
 316 static struct configfs_group_operations spaces_ops = {
 317         .make_group = make_space,
 318         .drop_item = drop_space,
 319 };
 320
 321 static struct configfs_item_operations space_ops = {
 322         .release = release_space,
 323 };
 324
 325 static struct configfs_group_operations comms_ops = {
 326         .make_item = make_comm,
 327         .drop_item = drop_comm,
 328 };
 329
 330 static struct configfs_item_operations comm_ops = {
 331         .release = release_comm,
 332 };
 333
 334 static struct configfs_group_operations nodes_ops = {
 335         .make_item = make_node,
 336         .drop_item = drop_node,
 337 };
 338
 339 static struct configfs_item_operations node_ops = {
 340         .release = release_node,
 341 };
 342
 343 static const struct config_item_type clusters_type = {
 344         .ct_group_ops = &clusters_ops,
 345         .ct_owner = THIS_MODULE,
 346 };
 347
 348 static const struct config_item_type cluster_type = {
 349         .ct_item_ops = &cluster_ops,
 350         .ct_attrs = cluster_attrs,
 351         .ct_owner = THIS_MODULE,
 352 };
 353
 354 static const struct config_item_type spaces_type = {
 355         .ct_group_ops = &spaces_ops,
 356         .ct_owner = THIS_MODULE,
 357 };
 358
 359 static const struct config_item_type space_type = {
 360         .ct_item_ops = &space_ops,
 361         .ct_owner = THIS_MODULE,
 362 };
 363
 364 static const struct config_item_type comms_type = {
 365         .ct_group_ops = &comms_ops,
 366         .ct_owner = THIS_MODULE,
 367 };
 368
 369 static const struct config_item_type comm_type = {
 370         .ct_item_ops = &comm_ops,
 371         .ct_attrs = comm_attrs,
 372         .ct_owner = THIS_MODULE,
 373 };
 374
 375 static const struct config_item_type nodes_type = {
 376         .ct_group_ops = &nodes_ops,
 377         .ct_owner = THIS_MODULE,
 378 };
 379
 380 static const struct config_item_type node_type = {
 381         .ct_item_ops = &node_ops,
 382         .ct_attrs = node_attrs,
 383         .ct_owner = THIS_MODULE,
 384 };
 385
 386 static struct dlm_space *config_item_to_space(struct config_item *i)
 387 {
 388         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 389                    NULL;
 390 }
 391
 392 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 393 {
 394         return i ? container_of(i, struct dlm_comm, item) : NULL;
 395 }
 396
 397 static struct dlm_node *config_item_to_node(struct config_item *i)
 398 {
 399         return i ? container_of(i, struct dlm_node, item) : NULL;
 400 }
 401
 402 static struct config_group *make_cluster(struct config_group *g,
 403                                          const char *name)
 404 {
 405         struct dlm_cluster *cl = NULL;
 406         struct dlm_spaces *sps = NULL;
 407         struct dlm_comms *cms = NULL;
 408
 409         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 410         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 411         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 412
 413         if (!cl || !sps || !cms)
 414                 goto fail;
 415
 416         cl->sps = sps;
 417         cl->cms = cms;
 418
 419         config_group_init_type_name(&cl->group, name, &cluster_type);
 420         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 421         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 422
 423         configfs_add_default_group(&sps->ss_group, &cl->group);
 424         configfs_add_default_group(&cms->cs_group, &cl->group);
 425
 426         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 427         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 428         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 429         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 430         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 431         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 432         cl->cl_log_debug = dlm_config.ci_log_debug;
 433         cl->cl_log_info = dlm_config.ci_log_info;
 434         cl->cl_protocol = dlm_config.ci_protocol;
 435         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 436         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 437         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 438                DLM_LOCKSPACE_LEN);
 439
 440         space_list = &sps->ss_group;
 441         comm_list = &cms->cs_group;
 442         return &cl->group;
 443
 444  fail:
 445         kfree(cl);
 446         kfree(sps);
 447         kfree(cms);
 448         return ERR_PTR(-ENOMEM);
 449 }
 450
 451 static void drop_cluster(struct config_group *g, struct config_item *i)
 452 {
 453         struct dlm_cluster *cl = config_item_to_cluster(i);
 454
 455         configfs_remove_default_groups(&cl->group);
 456
 457         space_list = NULL;
 458         comm_list = NULL;
 459
 460         config_item_put(i);
 461 }
 462
 463 static void release_cluster(struct config_item *i)
 464 {
 465         struct dlm_cluster *cl = config_item_to_cluster(i);
 466
 467         kfree(cl->sps);
 468         kfree(cl->cms);
 469         kfree(cl);
 470 }
 471
 472 static struct config_group *make_space(struct config_group *g, const char *name)
 473 {
 474         struct dlm_space *sp = NULL;
 475         struct dlm_nodes *nds = NULL;
 476
 477         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 478         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 479
 480         if (!sp || !nds)
 481                 goto fail;
 482
 483         config_group_init_type_name(&sp->group, name, &space_type);
 484
 485         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 486         configfs_add_default_group(&nds->ns_group, &sp->group);
 487
 488         INIT_LIST_HEAD(&sp->members);
 489         mutex_init(&sp->members_lock);
 490         sp->members_count = 0;
 491         sp->nds = nds;
 492         return &sp->group;
 493
 494  fail:
 495         kfree(sp);
 496         kfree(nds);
 497         return ERR_PTR(-ENOMEM);
 498 }
 499
 500 static void drop_space(struct config_group *g, struct config_item *i)
 501 {
 502         struct dlm_space *sp = config_item_to_space(i);
 503
 504         /* assert list_empty(&sp->members) */
 505
 506         configfs_remove_default_groups(&sp->group);
 507         config_item_put(i);
 508 }
 509
 510 static void release_space(struct config_item *i)
 511 {
 512         struct dlm_space *sp = config_item_to_space(i);
 513         kfree(sp->nds);
 514         kfree(sp);
 515 }
 516
 517 static struct config_item *make_comm(struct config_group *g, const char *name)
 518 {
 519         struct dlm_comm *cm;
 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 = -1;
 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         struct dlm_node *nd;
 559
 560         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 561         if (!nd)
 562                 return ERR_PTR(-ENOMEM);
 563
 564         config_item_init_type_name(&nd->item, name, &node_type);
 565         nd->nodeid = -1;
 566         nd->weight = 1;  /* default weight of 1 if none is set */
 567         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 568
 569         mutex_lock(&sp->members_lock);
 570         list_add(&nd->list, &sp->members);
 571         sp->members_count++;
 572         mutex_unlock(&sp->members_lock);
 573
 574         return &nd->item;
 575 }
 576
 577 static void drop_node(struct config_group *g, struct config_item *i)
 578 {
 579         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 580         struct dlm_node *nd = config_item_to_node(i);
 581
 582         mutex_lock(&sp->members_lock);
 583         list_del(&nd->list);
 584         sp->members_count--;
 585         mutex_unlock(&sp->members_lock);
 586
 587         config_item_put(i);
 588 }
 589
 590 static void release_node(struct config_item *i)
 591 {
 592         struct dlm_node *nd = config_item_to_node(i);
 593         kfree(nd);
 594 }
 595
 596 static struct dlm_clusters clusters_root = {
 597         .subsys = {
 598                 .su_group = {
 599                         .cg_item = {
 600                                 .ci_namebuf = "dlm",
 601                                 .ci_type = &clusters_type,
 602                         },
 603                 },
 604         },
 605 };
 606
 607 int __init dlm_config_init(void)
 608 {
 609         config_group_init(&clusters_root.subsys.su_group);
 610         mutex_init(&clusters_root.subsys.su_mutex);
 611         return configfs_register_subsystem(&clusters_root.subsys);
 612 }
 613
 614 void dlm_config_exit(void)
 615 {
 616         configfs_unregister_subsystem(&clusters_root.subsys);
 617 }
 618
 619 /*
 620  * Functions for user space to read/write attributes
 621  */
 622
 623 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 624 {
 625         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 626 }
 627
 628 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 629                                  size_t len)
 630 {
 631         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 632
 633         if (rc)
 634                 return rc;
 635         return len;
 636 }
 637
 638 static ssize_t comm_local_show(struct config_item *item, char *buf)
 639 {
 640         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 641 }
 642
 643 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 644                                 size_t len)
 645 {
 646         struct dlm_comm *cm = config_item_to_comm(item);
 647         int rc = kstrtoint(buf, 0, &cm->local);
 648
 649         if (rc)
 650                 return rc;
 651         if (cm->local && !local_comm)
 652                 local_comm = cm;
 653         return len;
 654 }
 655
 656 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 657                 size_t len)
 658 {
 659         struct dlm_comm *cm = config_item_to_comm(item);
 660         struct sockaddr_storage *addr;
 661         int rv;
 662
 663         if (len != sizeof(struct sockaddr_storage))
 664                 return -EINVAL;
 665
 666         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 667                 return -ENOSPC;
 668
 669         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 670         if (!addr)
 671                 return -ENOMEM;
 672
 673         memcpy(addr, buf, len);
 674
 675         rv = dlm_midcomms_addr(cm->nodeid, addr, len);
 676         if (rv) {
 677                 kfree(addr);
 678                 return rv;
 679         }
 680
 681         cm->addr[cm->addr_count++] = addr;
 682         return len;
 683 }
 684
 685 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 686 {
 687         struct dlm_comm *cm = config_item_to_comm(item);
 688         ssize_t s;
 689         ssize_t allowance;
 690         int i;
 691         struct sockaddr_storage *addr;
 692         struct sockaddr_in *addr_in;
 693         struct sockaddr_in6 *addr_in6;
 694
 695         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 696         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 697
 698
 699         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 700         allowance = 4096;
 701         buf[0] = '\0';
 702
 703         for (i = 0; i < cm->addr_count; i++) {
 704                 addr = cm->addr[i];
 705
 706                 switch(addr->ss_family) {
 707                 case AF_INET:
 708                         addr_in = (struct sockaddr_in *)addr;
 709                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 710                         break;
 711                 case AF_INET6:
 712                         addr_in6 = (struct sockaddr_in6 *)addr;
 713                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 714                         break;
 715                 default:
 716                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 717                         break;
 718                 }
 719                 allowance -= s;
 720                 if (allowance >= 0)
 721                         strcat(buf, buf0);
 722                 else {
 723                         allowance += s;
 724                         break;
 725                 }
 726         }
 727         return 4096 - allowance;
 728 }
 729
 730 static ssize_t comm_mark_show(struct config_item *item, char *buf)
 731 {
 732         return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
 733 }
 734
 735 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
 736                                size_t len)
 737 {
 738         struct dlm_comm *comm;
 739         unsigned int mark;
 740         int rc;
 741
 742         rc = kstrtouint(buf, 0, &mark);
 743         if (rc)
 744                 return rc;
 745
 746         if (mark == 0)
 747                 mark = dlm_config.ci_mark;
 748
 749         comm = config_item_to_comm(item);
 750         rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
 751         if (rc)
 752                 return rc;
 753
 754         comm->mark = mark;
 755         return len;
 756 }
 757
 758 CONFIGFS_ATTR(comm_, nodeid);
 759 CONFIGFS_ATTR(comm_, local);
 760 CONFIGFS_ATTR(comm_, mark);
 761 CONFIGFS_ATTR_WO(comm_, addr);
 762 CONFIGFS_ATTR_RO(comm_, addr_list);
 763
 764 static struct configfs_attribute *comm_attrs[] = {
 765         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 766         [COMM_ATTR_LOCAL] = &comm_attr_local,
 767         [COMM_ATTR_ADDR] = &comm_attr_addr,
 768         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 769         [COMM_ATTR_MARK] = &comm_attr_mark,
 770         NULL,
 771 };
 772
 773 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 774 {
 775         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 776 }
 777
 778 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 779                                  size_t len)
 780 {
 781         struct dlm_node *nd = config_item_to_node(item);
 782         uint32_t seq = 0;
 783         int rc = kstrtoint(buf, 0, &nd->nodeid);
 784
 785         if (rc)
 786                 return rc;
 787         dlm_comm_seq(nd->nodeid, &seq);
 788         nd->comm_seq = seq;
 789         return len;
 790 }
 791
 792 static ssize_t node_weight_show(struct config_item *item, char *buf)
 793 {
 794         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 795 }
 796
 797 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 798                                  size_t len)
 799 {
 800         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 801
 802         if (rc)
 803                 return rc;
 804         return len;
 805 }
 806
 807 CONFIGFS_ATTR(node_, nodeid);
 808 CONFIGFS_ATTR(node_, weight);
 809
 810 static struct configfs_attribute *node_attrs[] = {
 811         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 812         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 813         NULL,
 814 };
 815
 816 /*
 817  * Functions for the dlm to get the info that's been configured
 818  */
 819
 820 static struct dlm_space *get_space(char *name)
 821 {
 822         struct config_item *i;
 823
 824         if (!space_list)
 825                 return NULL;
 826
 827         mutex_lock(&space_list->cg_subsys->su_mutex);
 828         i = config_group_find_item(space_list, name);
 829         mutex_unlock(&space_list->cg_subsys->su_mutex);
 830
 831         return config_item_to_space(i);
 832 }
 833
 834 static void put_space(struct dlm_space *sp)
 835 {
 836         config_item_put(&sp->group.cg_item);
 837 }
 838
 839 static struct dlm_comm *get_comm(int nodeid)
 840 {
 841         struct config_item *i;
 842         struct dlm_comm *cm = NULL;
 843         int found = 0;
 844
 845         if (!comm_list)
 846                 return NULL;
 847
 848         mutex_lock(&clusters_root.subsys.su_mutex);
 849
 850         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 851                 cm = config_item_to_comm(i);
 852
 853                 if (cm->nodeid != nodeid)
 854                         continue;
 855                 found = 1;
 856                 config_item_get(i);
 857                 break;
 858         }
 859         mutex_unlock(&clusters_root.subsys.su_mutex);
 860
 861         if (!found)
 862                 cm = NULL;
 863         return cm;
 864 }
 865
 866 static void put_comm(struct dlm_comm *cm)
 867 {
 868         config_item_put(&cm->item);
 869 }
 870
 871 /* caller must free mem */
 872 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 873                      int *count_out)
 874 {
 875         struct dlm_space *sp;
 876         struct dlm_node *nd;
 877         struct dlm_config_node *nodes, *node;
 878         int rv, count;
 879
 880         sp = get_space(lsname);
 881         if (!sp)
 882                 return -EEXIST;
 883
 884         mutex_lock(&sp->members_lock);
 885         if (!sp->members_count) {
 886                 rv = -EINVAL;
 887                 printk(KERN_ERR "dlm: zero members_count\n");
 888                 goto out;
 889         }
 890
 891         count = sp->members_count;
 892
 893         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 894         if (!nodes) {
 895                 rv = -ENOMEM;
 896                 goto out;
 897         }
 898
 899         node = nodes;
 900         list_for_each_entry(nd, &sp->members, list) {
 901                 node->nodeid = nd->nodeid;
 902                 node->weight = nd->weight;
 903                 node->new = nd->new;
 904                 node->comm_seq = nd->comm_seq;
 905                 node++;
 906
 907                 nd->new = 0;
 908         }
 909
 910         *count_out = count;
 911         *nodes_out = nodes;
 912         rv = 0;
 913  out:
 914         mutex_unlock(&sp->members_lock);
 915         put_space(sp);
 916         return rv;
 917 }
 918
 919 int dlm_comm_seq(int nodeid, uint32_t *seq)
 920 {
 921         struct dlm_comm *cm = get_comm(nodeid);
 922         if (!cm)
 923                 return -EEXIST;
 924         *seq = cm->seq;
 925         put_comm(cm);
 926         return 0;
 927 }
 928
 929 int dlm_our_nodeid(void)
 930 {
 931         return local_comm ? local_comm->nodeid : 0;
 932 }
 933
 934 /* num 0 is first addr, num 1 is second addr */
 935 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 936 {
 937         if (!local_comm)
 938                 return -1;
 939         if (num + 1 > local_comm->addr_count)
 940                 return -1;
 941         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 942         return 0;
 943 }
 944
 945 /* Config file defaults */
 946 #define DEFAULT_TCP_PORT       21064
 947 #define DEFAULT_RSBTBL_SIZE     1024
 948 #define DEFAULT_RECOVER_TIMER      5
 949 #define DEFAULT_TOSS_SECS         10
 950 #define DEFAULT_SCAN_SECS          5
 951 #define DEFAULT_LOG_DEBUG          0
 952 #define DEFAULT_LOG_INFO           1
 953 #define DEFAULT_PROTOCOL           DLM_PROTO_TCP
 954 #define DEFAULT_MARK               0
 955 #define DEFAULT_NEW_RSB_COUNT    128
 956 #define DEFAULT_RECOVER_CALLBACKS  0
 957 #define DEFAULT_CLUSTER_NAME      ""
 958
 959 struct dlm_config_info dlm_config = {
 960         .ci_tcp_port = DEFAULT_TCP_PORT,
 961         .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
 962         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 963         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 964         .ci_toss_secs = DEFAULT_TOSS_SECS,
 965         .ci_scan_secs = DEFAULT_SCAN_SECS,
 966         .ci_log_debug = DEFAULT_LOG_DEBUG,
 967         .ci_log_info = DEFAULT_LOG_INFO,
 968         .ci_protocol = DEFAULT_PROTOCOL,
 969         .ci_mark = DEFAULT_MARK,
 970         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 971         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 972         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 973 };
 974