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 struct dlm_cluster {
  67         struct config_group group;
  68         unsigned int cl_tcp_port;
  69         unsigned int cl_buffer_size;
  70         unsigned int cl_rsbtbl_size;
  71         unsigned int cl_recover_timer;
  72         unsigned int cl_toss_secs;
  73         unsigned int cl_scan_secs;
  74         unsigned int cl_log_debug;
  75         unsigned int cl_log_info;
  76         unsigned int cl_protocol;
  77         unsigned int cl_mark;
  78         unsigned int cl_timewarn_cs;
  79         unsigned int cl_waitwarn_us;
  80         unsigned int cl_new_rsb_count;
  81         unsigned int cl_recover_callbacks;
  82         char cl_cluster_name[DLM_LOCKSPACE_LEN];
  83 };
  84
  85 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  86 {
  87         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  88                    NULL;
  89 }
  90
  91 enum {
  92         CLUSTER_ATTR_TCP_PORT = 0,
  93         CLUSTER_ATTR_BUFFER_SIZE,
  94         CLUSTER_ATTR_RSBTBL_SIZE,
  95         CLUSTER_ATTR_RECOVER_TIMER,
  96         CLUSTER_ATTR_TOSS_SECS,
  97         CLUSTER_ATTR_SCAN_SECS,
  98         CLUSTER_ATTR_LOG_DEBUG,
  99         CLUSTER_ATTR_LOG_INFO,
 100         CLUSTER_ATTR_PROTOCOL,
 101         CLUSTER_ATTR_MARK,
 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_cb)(unsigned int x),
 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_cb) {
 142                 rc = check_cb(x);
 143                 if (rc)
 144                         return rc;
 145         }
 146
 147         *cl_field = x;
 148         *info_field = x;
 149
 150         return len;
 151 }
 152
 153 #define CLUSTER_ATTR(name, check_cb)                                          \
 154 static ssize_t cluster_##name##_store(struct config_item *item, \
 155                 const char *buf, size_t len) \
 156 {                                                                             \
 157         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 158         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 159                            check_cb, buf, len);                               \
 160 }                                                                             \
 161 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 162 {                                                                             \
 163         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 164         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 165 }                                                                             \
 166 CONFIGFS_ATTR(cluster_, name);
 167
 168 static int dlm_check_protocol_and_dlm_running(unsigned int x)
 169 {
 170         switch (x) {
 171         case 0:
 172                 /* TCP */
 173                 break;
 174         case 1:
 175                 /* SCTP */
 176                 break;
 177         default:
 178                 return -EINVAL;
 179         }
 180
 181         if (dlm_allow_conn)
 182                 return -EBUSY;
 183
 184         return 0;
 185 }
 186
 187 static int dlm_check_zero_and_dlm_running(unsigned int x)
 188 {
 189         if (!x)
 190                 return -EINVAL;
 191
 192         if (dlm_allow_conn)
 193                 return -EBUSY;
 194
 195         return 0;
 196 }
 197
 198 static int dlm_check_zero(unsigned int x)
 199 {
 200         if (!x)
 201                 return -EINVAL;
 202
 203         return 0;
 204 }
 205
 206 static int dlm_check_buffer_size(unsigned int x)
 207 {
 208         if (x < DEFAULT_BUFFER_SIZE)
 209                 return -EINVAL;
 210
 211         return 0;
 212 }
 213
 214 CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
 215 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
 216 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
 217 CLUSTER_ATTR(recover_timer, dlm_check_zero);
 218 CLUSTER_ATTR(toss_secs, dlm_check_zero);
 219 CLUSTER_ATTR(scan_secs, dlm_check_zero);
 220 CLUSTER_ATTR(log_debug, NULL);
 221 CLUSTER_ATTR(log_info, NULL);
 222 CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
 223 CLUSTER_ATTR(mark, NULL);
 224 CLUSTER_ATTR(timewarn_cs, dlm_check_zero);
 225 CLUSTER_ATTR(waitwarn_us, NULL);
 226 CLUSTER_ATTR(new_rsb_count, NULL);
 227 CLUSTER_ATTR(recover_callbacks, NULL);
 228
 229 static struct configfs_attribute *cluster_attrs[] = {
 230         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 231         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 232         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 233         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 234         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 235         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 236         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 237         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 238         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 239         [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
 240         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 241         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
 242         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 243         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 244         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 245         NULL,
 246 };
 247
 248 enum {
 249         COMM_ATTR_NODEID = 0,
 250         COMM_ATTR_LOCAL,
 251         COMM_ATTR_ADDR,
 252         COMM_ATTR_ADDR_LIST,
 253         COMM_ATTR_MARK,
 254 };
 255
 256 enum {
 257         NODE_ATTR_NODEID = 0,
 258         NODE_ATTR_WEIGHT,
 259 };
 260
 261 struct dlm_clusters {
 262         struct configfs_subsystem subsys;
 263 };
 264
 265 struct dlm_spaces {
 266         struct config_group ss_group;
 267 };
 268
 269 struct dlm_space {
 270         struct config_group group;
 271         struct list_head members;
 272         struct mutex members_lock;
 273         int members_count;
 274         struct dlm_nodes *nds;
 275 };
 276
 277 struct dlm_comms {
 278         struct config_group cs_group;
 279 };
 280
 281 struct dlm_comm {
 282         struct config_item item;
 283         int seq;
 284         int nodeid;
 285         int local;
 286         int addr_count;
 287         unsigned int mark;
 288         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 289 };
 290
 291 struct dlm_nodes {
 292         struct config_group ns_group;
 293 };
 294
 295 struct dlm_node {
 296         struct config_item item;
 297         struct list_head list; /* space->members */
 298         int nodeid;
 299         int weight;
 300         int new;
 301         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 302 };
 303
 304 static struct configfs_group_operations clusters_ops = {
 305         .make_group = make_cluster,
 306         .drop_item = drop_cluster,
 307 };
 308
 309 static struct configfs_item_operations cluster_ops = {
 310         .release = release_cluster,
 311 };
 312
 313 static struct configfs_group_operations spaces_ops = {
 314         .make_group = make_space,
 315         .drop_item = drop_space,
 316 };
 317
 318 static struct configfs_item_operations space_ops = {
 319         .release = release_space,
 320 };
 321
 322 static struct configfs_group_operations comms_ops = {
 323         .make_item = make_comm,
 324         .drop_item = drop_comm,
 325 };
 326
 327 static struct configfs_item_operations comm_ops = {
 328         .release = release_comm,
 329 };
 330
 331 static struct configfs_group_operations nodes_ops = {
 332         .make_item = make_node,
 333         .drop_item = drop_node,
 334 };
 335
 336 static struct configfs_item_operations node_ops = {
 337         .release = release_node,
 338 };
 339
 340 static const struct config_item_type clusters_type = {
 341         .ct_group_ops = &clusters_ops,
 342         .ct_owner = THIS_MODULE,
 343 };
 344
 345 static const struct config_item_type cluster_type = {
 346         .ct_item_ops = &cluster_ops,
 347         .ct_attrs = cluster_attrs,
 348         .ct_owner = THIS_MODULE,
 349 };
 350
 351 static const struct config_item_type spaces_type = {
 352         .ct_group_ops = &spaces_ops,
 353         .ct_owner = THIS_MODULE,
 354 };
 355
 356 static const struct config_item_type space_type = {
 357         .ct_item_ops = &space_ops,
 358         .ct_owner = THIS_MODULE,
 359 };
 360
 361 static const struct config_item_type comms_type = {
 362         .ct_group_ops = &comms_ops,
 363         .ct_owner = THIS_MODULE,
 364 };
 365
 366 static const struct config_item_type comm_type = {
 367         .ct_item_ops = &comm_ops,
 368         .ct_attrs = comm_attrs,
 369         .ct_owner = THIS_MODULE,
 370 };
 371
 372 static const struct config_item_type nodes_type = {
 373         .ct_group_ops = &nodes_ops,
 374         .ct_owner = THIS_MODULE,
 375 };
 376
 377 static const struct config_item_type node_type = {
 378         .ct_item_ops = &node_ops,
 379         .ct_attrs = node_attrs,
 380         .ct_owner = THIS_MODULE,
 381 };
 382
 383 static struct dlm_space *config_item_to_space(struct config_item *i)
 384 {
 385         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 386                    NULL;
 387 }
 388
 389 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 390 {
 391         return i ? container_of(i, struct dlm_comm, item) : NULL;
 392 }
 393
 394 static struct dlm_node *config_item_to_node(struct config_item *i)
 395 {
 396         return i ? container_of(i, struct dlm_node, item) : NULL;
 397 }
 398
 399 static struct config_group *make_cluster(struct config_group *g,
 400                                          const char *name)
 401 {
 402         struct dlm_cluster *cl = NULL;
 403         struct dlm_spaces *sps = NULL;
 404         struct dlm_comms *cms = NULL;
 405
 406         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 407         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 408         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 409
 410         if (!cl || !sps || !cms)
 411                 goto fail;
 412
 413         config_group_init_type_name(&cl->group, name, &cluster_type);
 414         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 415         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 416
 417         configfs_add_default_group(&sps->ss_group, &cl->group);
 418         configfs_add_default_group(&cms->cs_group, &cl->group);
 419
 420         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 421         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 422         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 423         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 424         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 425         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 426         cl->cl_log_debug = dlm_config.ci_log_debug;
 427         cl->cl_log_info = dlm_config.ci_log_info;
 428         cl->cl_protocol = dlm_config.ci_protocol;
 429         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 430         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 431         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 432         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 433         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 434                DLM_LOCKSPACE_LEN);
 435
 436         space_list = &sps->ss_group;
 437         comm_list = &cms->cs_group;
 438         return &cl->group;
 439
 440  fail:
 441         kfree(cl);
 442         kfree(sps);
 443         kfree(cms);
 444         return ERR_PTR(-ENOMEM);
 445 }
 446
 447 static void drop_cluster(struct config_group *g, struct config_item *i)
 448 {
 449         struct dlm_cluster *cl = config_item_to_cluster(i);
 450
 451         configfs_remove_default_groups(&cl->group);
 452
 453         space_list = NULL;
 454         comm_list = NULL;
 455
 456         config_item_put(i);
 457 }
 458
 459 static void release_cluster(struct config_item *i)
 460 {
 461         struct dlm_cluster *cl = config_item_to_cluster(i);
 462         kfree(cl);
 463 }
 464
 465 static struct config_group *make_space(struct config_group *g, const char *name)
 466 {
 467         struct dlm_space *sp = NULL;
 468         struct dlm_nodes *nds = NULL;
 469
 470         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 471         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 472
 473         if (!sp || !nds)
 474                 goto fail;
 475
 476         config_group_init_type_name(&sp->group, name, &space_type);
 477
 478         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 479         configfs_add_default_group(&nds->ns_group, &sp->group);
 480
 481         INIT_LIST_HEAD(&sp->members);
 482         mutex_init(&sp->members_lock);
 483         sp->members_count = 0;
 484         sp->nds = nds;
 485         return &sp->group;
 486
 487  fail:
 488         kfree(sp);
 489         kfree(nds);
 490         return ERR_PTR(-ENOMEM);
 491 }
 492
 493 static void drop_space(struct config_group *g, struct config_item *i)
 494 {
 495         struct dlm_space *sp = config_item_to_space(i);
 496
 497         /* assert list_empty(&sp->members) */
 498
 499         configfs_remove_default_groups(&sp->group);
 500         config_item_put(i);
 501 }
 502
 503 static void release_space(struct config_item *i)
 504 {
 505         struct dlm_space *sp = config_item_to_space(i);
 506         kfree(sp->nds);
 507         kfree(sp);
 508 }
 509
 510 static struct config_item *make_comm(struct config_group *g, const char *name)
 511 {
 512         struct dlm_comm *cm;
 513
 514         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 515         if (!cm)
 516                 return ERR_PTR(-ENOMEM);
 517
 518         config_item_init_type_name(&cm->item, name, &comm_type);
 519
 520         cm->seq = dlm_comm_count++;
 521         if (!cm->seq)
 522                 cm->seq = dlm_comm_count++;
 523
 524         cm->nodeid = -1;
 525         cm->local = 0;
 526         cm->addr_count = 0;
 527         cm->mark = 0;
 528         return &cm->item;
 529 }
 530
 531 static void drop_comm(struct config_group *g, struct config_item *i)
 532 {
 533         struct dlm_comm *cm = config_item_to_comm(i);
 534         if (local_comm == cm)
 535                 local_comm = NULL;
 536         dlm_midcomms_close(cm->nodeid);
 537         while (cm->addr_count--)
 538                 kfree(cm->addr[cm->addr_count]);
 539         config_item_put(i);
 540 }
 541
 542 static void release_comm(struct config_item *i)
 543 {
 544         struct dlm_comm *cm = config_item_to_comm(i);
 545         kfree(cm);
 546 }
 547
 548 static struct config_item *make_node(struct config_group *g, const char *name)
 549 {
 550         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 551         struct dlm_node *nd;
 552
 553         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 554         if (!nd)
 555                 return ERR_PTR(-ENOMEM);
 556
 557         config_item_init_type_name(&nd->item, name, &node_type);
 558         nd->nodeid = -1;
 559         nd->weight = 1;  /* default weight of 1 if none is set */
 560         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 561
 562         mutex_lock(&sp->members_lock);
 563         list_add(&nd->list, &sp->members);
 564         sp->members_count++;
 565         mutex_unlock(&sp->members_lock);
 566
 567         return &nd->item;
 568 }
 569
 570 static void drop_node(struct config_group *g, struct config_item *i)
 571 {
 572         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 573         struct dlm_node *nd = config_item_to_node(i);
 574
 575         mutex_lock(&sp->members_lock);
 576         list_del(&nd->list);
 577         sp->members_count--;
 578         mutex_unlock(&sp->members_lock);
 579
 580         config_item_put(i);
 581 }
 582
 583 static void release_node(struct config_item *i)
 584 {
 585         struct dlm_node *nd = config_item_to_node(i);
 586         kfree(nd);
 587 }
 588
 589 static struct dlm_clusters clusters_root = {
 590         .subsys = {
 591                 .su_group = {
 592                         .cg_item = {
 593                                 .ci_namebuf = "dlm",
 594                                 .ci_type = &clusters_type,
 595                         },
 596                 },
 597         },
 598 };
 599
 600 int __init dlm_config_init(void)
 601 {
 602         config_group_init(&clusters_root.subsys.su_group);
 603         mutex_init(&clusters_root.subsys.su_mutex);
 604         return configfs_register_subsystem(&clusters_root.subsys);
 605 }
 606
 607 void dlm_config_exit(void)
 608 {
 609         configfs_unregister_subsystem(&clusters_root.subsys);
 610 }
 611
 612 /*
 613  * Functions for user space to read/write attributes
 614  */
 615
 616 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 617 {
 618         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 619 }
 620
 621 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 622                                  size_t len)
 623 {
 624         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 625
 626         if (rc)
 627                 return rc;
 628         return len;
 629 }
 630
 631 static ssize_t comm_local_show(struct config_item *item, char *buf)
 632 {
 633         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 634 }
 635
 636 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 637                                 size_t len)
 638 {
 639         struct dlm_comm *cm = config_item_to_comm(item);
 640         int rc = kstrtoint(buf, 0, &cm->local);
 641
 642         if (rc)
 643                 return rc;
 644         if (cm->local && !local_comm)
 645                 local_comm = cm;
 646         return len;
 647 }
 648
 649 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 650                 size_t len)
 651 {
 652         struct dlm_comm *cm = config_item_to_comm(item);
 653         struct sockaddr_storage *addr;
 654         int rv;
 655
 656         if (len != sizeof(struct sockaddr_storage))
 657                 return -EINVAL;
 658
 659         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 660                 return -ENOSPC;
 661
 662         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 663         if (!addr)
 664                 return -ENOMEM;
 665
 666         memcpy(addr, buf, len);
 667
 668         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 669         if (rv) {
 670                 kfree(addr);
 671                 return rv;
 672         }
 673
 674         cm->addr[cm->addr_count++] = addr;
 675         return len;
 676 }
 677
 678 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 679 {
 680         struct dlm_comm *cm = config_item_to_comm(item);
 681         ssize_t s;
 682         ssize_t allowance;
 683         int i;
 684         struct sockaddr_storage *addr;
 685         struct sockaddr_in *addr_in;
 686         struct sockaddr_in6 *addr_in6;
 687
 688         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 689         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 690
 691
 692         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 693         allowance = 4096;
 694         buf[0] = '\0';
 695
 696         for (i = 0; i < cm->addr_count; i++) {
 697                 addr = cm->addr[i];
 698
 699                 switch(addr->ss_family) {
 700                 case AF_INET:
 701                         addr_in = (struct sockaddr_in *)addr;
 702                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 703                         break;
 704                 case AF_INET6:
 705                         addr_in6 = (struct sockaddr_in6 *)addr;
 706                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 707                         break;
 708                 default:
 709                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 710                         break;
 711                 }
 712                 allowance -= s;
 713                 if (allowance >= 0)
 714                         strcat(buf, buf0);
 715                 else {
 716                         allowance += s;
 717                         break;
 718                 }
 719         }
 720         return 4096 - allowance;
 721 }
 722
 723 static ssize_t comm_mark_show(struct config_item *item, char *buf)
 724 {
 725         return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
 726 }
 727
 728 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
 729                                size_t len)
 730 {
 731         struct dlm_comm *comm;
 732         unsigned int mark;
 733         int rc;
 734
 735         rc = kstrtouint(buf, 0, &mark);
 736         if (rc)
 737                 return rc;
 738
 739         if (mark == 0)
 740                 mark = dlm_config.ci_mark;
 741
 742         comm = config_item_to_comm(item);
 743         rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
 744         if (rc)
 745                 return rc;
 746
 747         comm->mark = mark;
 748         return len;
 749 }
 750
 751 CONFIGFS_ATTR(comm_, nodeid);
 752 CONFIGFS_ATTR(comm_, local);
 753 CONFIGFS_ATTR(comm_, mark);
 754 CONFIGFS_ATTR_WO(comm_, addr);
 755 CONFIGFS_ATTR_RO(comm_, addr_list);
 756
 757 static struct configfs_attribute *comm_attrs[] = {
 758         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 759         [COMM_ATTR_LOCAL] = &comm_attr_local,
 760         [COMM_ATTR_ADDR] = &comm_attr_addr,
 761         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 762         [COMM_ATTR_MARK] = &comm_attr_mark,
 763         NULL,
 764 };
 765
 766 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 767 {
 768         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 769 }
 770
 771 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 772                                  size_t len)
 773 {
 774         struct dlm_node *nd = config_item_to_node(item);
 775         uint32_t seq = 0;
 776         int rc = kstrtoint(buf, 0, &nd->nodeid);
 777
 778         if (rc)
 779                 return rc;
 780         dlm_comm_seq(nd->nodeid, &seq);
 781         nd->comm_seq = seq;
 782         return len;
 783 }
 784
 785 static ssize_t node_weight_show(struct config_item *item, char *buf)
 786 {
 787         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 788 }
 789
 790 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 791                                  size_t len)
 792 {
 793         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 794
 795         if (rc)
 796                 return rc;
 797         return len;
 798 }
 799
 800 CONFIGFS_ATTR(node_, nodeid);
 801 CONFIGFS_ATTR(node_, weight);
 802
 803 static struct configfs_attribute *node_attrs[] = {
 804         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 805         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 806         NULL,
 807 };
 808
 809 /*
 810  * Functions for the dlm to get the info that's been configured
 811  */
 812
 813 static struct dlm_space *get_space(char *name)
 814 {
 815         struct config_item *i;
 816
 817         if (!space_list)
 818                 return NULL;
 819
 820         mutex_lock(&space_list->cg_subsys->su_mutex);
 821         i = config_group_find_item(space_list, name);
 822         mutex_unlock(&space_list->cg_subsys->su_mutex);
 823
 824         return config_item_to_space(i);
 825 }
 826
 827 static void put_space(struct dlm_space *sp)
 828 {
 829         config_item_put(&sp->group.cg_item);
 830 }
 831
 832 static struct dlm_comm *get_comm(int nodeid)
 833 {
 834         struct config_item *i;
 835         struct dlm_comm *cm = NULL;
 836         int found = 0;
 837
 838         if (!comm_list)
 839                 return NULL;
 840
 841         mutex_lock(&clusters_root.subsys.su_mutex);
 842
 843         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 844                 cm = config_item_to_comm(i);
 845
 846                 if (cm->nodeid != nodeid)
 847                         continue;
 848                 found = 1;
 849                 config_item_get(i);
 850                 break;
 851         }
 852         mutex_unlock(&clusters_root.subsys.su_mutex);
 853
 854         if (!found)
 855                 cm = NULL;
 856         return cm;
 857 }
 858
 859 static void put_comm(struct dlm_comm *cm)
 860 {
 861         config_item_put(&cm->item);
 862 }
 863
 864 /* caller must free mem */
 865 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 866                      int *count_out)
 867 {
 868         struct dlm_space *sp;
 869         struct dlm_node *nd;
 870         struct dlm_config_node *nodes, *node;
 871         int rv, count;
 872
 873         sp = get_space(lsname);
 874         if (!sp)
 875                 return -EEXIST;
 876
 877         mutex_lock(&sp->members_lock);
 878         if (!sp->members_count) {
 879                 rv = -EINVAL;
 880                 printk(KERN_ERR "dlm: zero members_count\n");
 881                 goto out;
 882         }
 883
 884         count = sp->members_count;
 885
 886         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 887         if (!nodes) {
 888                 rv = -ENOMEM;
 889                 goto out;
 890         }
 891
 892         node = nodes;
 893         list_for_each_entry(nd, &sp->members, list) {
 894                 node->nodeid = nd->nodeid;
 895                 node->weight = nd->weight;
 896                 node->new = nd->new;
 897                 node->comm_seq = nd->comm_seq;
 898                 node++;
 899
 900                 nd->new = 0;
 901         }
 902
 903         *count_out = count;
 904         *nodes_out = nodes;
 905         rv = 0;
 906  out:
 907         mutex_unlock(&sp->members_lock);
 908         put_space(sp);
 909         return rv;
 910 }
 911
 912 int dlm_comm_seq(int nodeid, uint32_t *seq)
 913 {
 914         struct dlm_comm *cm = get_comm(nodeid);
 915         if (!cm)
 916                 return -EEXIST;
 917         *seq = cm->seq;
 918         put_comm(cm);
 919         return 0;
 920 }
 921
 922 int dlm_our_nodeid(void)
 923 {
 924         return local_comm ? local_comm->nodeid : 0;
 925 }
 926
 927 /* num 0 is first addr, num 1 is second addr */
 928 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 929 {
 930         if (!local_comm)
 931                 return -1;
 932         if (num + 1 > local_comm->addr_count)
 933                 return -1;
 934         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 935         return 0;
 936 }
 937
 938 /* Config file defaults */
 939 #define DEFAULT_TCP_PORT       21064
 940 #define DEFAULT_RSBTBL_SIZE     1024
 941 #define DEFAULT_RECOVER_TIMER      5
 942 #define DEFAULT_TOSS_SECS         10
 943 #define DEFAULT_SCAN_SECS          5
 944 #define DEFAULT_LOG_DEBUG          0
 945 #define DEFAULT_LOG_INFO           1
 946 #define DEFAULT_PROTOCOL           0
 947 #define DEFAULT_MARK               0
 948 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 949 #define DEFAULT_WAITWARN_US        0
 950 #define DEFAULT_NEW_RSB_COUNT    128
 951 #define DEFAULT_RECOVER_CALLBACKS  0
 952 #define DEFAULT_CLUSTER_NAME      ""
 953
 954 struct dlm_config_info dlm_config = {
 955         .ci_tcp_port = DEFAULT_TCP_PORT,
 956         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 957         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 958         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 959         .ci_toss_secs = DEFAULT_TOSS_SECS,
 960         .ci_scan_secs = DEFAULT_SCAN_SECS,
 961         .ci_log_debug = DEFAULT_LOG_DEBUG,
 962         .ci_log_info = DEFAULT_LOG_INFO,
 963         .ci_protocol = DEFAULT_PROTOCOL,
 964         .ci_mark = DEFAULT_MARK,
 965         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 966         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 967         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 968         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 969         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 970 };
 971