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 #ifdef CONFIG_DLM_DEPRECATED_API
  79         unsigned int cl_timewarn_cs;
  80 #endif
  81         unsigned int cl_new_rsb_count;
  82         unsigned int cl_recover_callbacks;
  83         char cl_cluster_name[DLM_LOCKSPACE_LEN];
  84
  85         struct dlm_spaces *sps;
  86         struct dlm_comms *cms;
  87 };
  88
  89 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  90 {
  91         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  92                    NULL;
  93 }
  94
  95 enum {
  96         CLUSTER_ATTR_TCP_PORT = 0,
  97         CLUSTER_ATTR_BUFFER_SIZE,
  98         CLUSTER_ATTR_RSBTBL_SIZE,
  99         CLUSTER_ATTR_RECOVER_TIMER,
 100         CLUSTER_ATTR_TOSS_SECS,
 101         CLUSTER_ATTR_SCAN_SECS,
 102         CLUSTER_ATTR_LOG_DEBUG,
 103         CLUSTER_ATTR_LOG_INFO,
 104         CLUSTER_ATTR_PROTOCOL,
 105         CLUSTER_ATTR_MARK,
 106 #ifdef CONFIG_DLM_DEPRECATED_API
 107         CLUSTER_ATTR_TIMEWARN_CS,
 108 #endif
 109         CLUSTER_ATTR_NEW_RSB_COUNT,
 110         CLUSTER_ATTR_RECOVER_CALLBACKS,
 111         CLUSTER_ATTR_CLUSTER_NAME,
 112 };
 113
 114 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
 115 {
 116         struct dlm_cluster *cl = config_item_to_cluster(item);
 117         return sprintf(buf, "%s\n", cl->cl_cluster_name);
 118 }
 119
 120 static ssize_t cluster_cluster_name_store(struct config_item *item,
 121                                           const char *buf, size_t len)
 122 {
 123         struct dlm_cluster *cl = config_item_to_cluster(item);
 124
 125         strlcpy(dlm_config.ci_cluster_name, buf,
 126                                 sizeof(dlm_config.ci_cluster_name));
 127         strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
 128         return len;
 129 }
 130
 131 CONFIGFS_ATTR(cluster_, cluster_name);
 132
 133 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 134                            int *info_field, int (*check_cb)(unsigned int x),
 135                            const char *buf, size_t len)
 136 {
 137         unsigned int x;
 138         int rc;
 139
 140         if (!capable(CAP_SYS_ADMIN))
 141                 return -EPERM;
 142         rc = kstrtouint(buf, 0, &x);
 143         if (rc)
 144                 return rc;
 145
 146         if (check_cb) {
 147                 rc = check_cb(x);
 148                 if (rc)
 149                         return rc;
 150         }
 151
 152         *cl_field = x;
 153         *info_field = x;
 154
 155         return len;
 156 }
 157
 158 #define CLUSTER_ATTR(name, check_cb)                                          \
 159 static ssize_t cluster_##name##_store(struct config_item *item, \
 160                 const char *buf, size_t len) \
 161 {                                                                             \
 162         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 163         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 164                            check_cb, buf, len);                               \
 165 }                                                                             \
 166 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 167 {                                                                             \
 168         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 169         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 170 }                                                                             \
 171 CONFIGFS_ATTR(cluster_, name);
 172
 173 static int dlm_check_protocol_and_dlm_running(unsigned int x)
 174 {
 175         switch (x) {
 176         case 0:
 177                 /* TCP */
 178                 break;
 179         case 1:
 180                 /* SCTP */
 181                 break;
 182         default:
 183                 return -EINVAL;
 184         }
 185
 186         if (dlm_allow_conn)
 187                 return -EBUSY;
 188
 189         return 0;
 190 }
 191
 192 static int dlm_check_zero_and_dlm_running(unsigned int x)
 193 {
 194         if (!x)
 195                 return -EINVAL;
 196
 197         if (dlm_allow_conn)
 198                 return -EBUSY;
 199
 200         return 0;
 201 }
 202
 203 static int dlm_check_zero(unsigned int x)
 204 {
 205         if (!x)
 206                 return -EINVAL;
 207
 208         return 0;
 209 }
 210
 211 static int dlm_check_buffer_size(unsigned int x)
 212 {
 213         if (x < DLM_MAX_SOCKET_BUFSIZE)
 214                 return -EINVAL;
 215
 216         return 0;
 217 }
 218
 219 CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
 220 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
 221 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
 222 CLUSTER_ATTR(recover_timer, dlm_check_zero);
 223 CLUSTER_ATTR(toss_secs, dlm_check_zero);
 224 CLUSTER_ATTR(scan_secs, dlm_check_zero);
 225 CLUSTER_ATTR(log_debug, NULL);
 226 CLUSTER_ATTR(log_info, NULL);
 227 CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
 228 CLUSTER_ATTR(mark, NULL);
 229 #ifdef CONFIG_DLM_DEPRECATED_API
 230 CLUSTER_ATTR(timewarn_cs, dlm_check_zero);
 231 #endif
 232 CLUSTER_ATTR(new_rsb_count, NULL);
 233 CLUSTER_ATTR(recover_callbacks, NULL);
 234
 235 static struct configfs_attribute *cluster_attrs[] = {
 236         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 237         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 238         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 239         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 240         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 241         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 242         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 243         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 244         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 245         [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
 246 #ifdef CONFIG_DLM_DEPRECATED_API
 247         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 248 #endif
 249         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 250         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 251         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 252         NULL,
 253 };
 254
 255 enum {
 256         COMM_ATTR_NODEID = 0,
 257         COMM_ATTR_LOCAL,
 258         COMM_ATTR_ADDR,
 259         COMM_ATTR_ADDR_LIST,
 260         COMM_ATTR_MARK,
 261 };
 262
 263 enum {
 264         NODE_ATTR_NODEID = 0,
 265         NODE_ATTR_WEIGHT,
 266 };
 267
 268 struct dlm_clusters {
 269         struct configfs_subsystem subsys;
 270 };
 271
 272 struct dlm_spaces {
 273         struct config_group ss_group;
 274 };
 275
 276 struct dlm_space {
 277         struct config_group group;
 278         struct list_head members;
 279         struct mutex members_lock;
 280         int members_count;
 281         struct dlm_nodes *nds;
 282 };
 283
 284 struct dlm_comms {
 285         struct config_group cs_group;
 286 };
 287
 288 struct dlm_comm {
 289         struct config_item item;
 290         int seq;
 291         int nodeid;
 292         int local;
 293         int addr_count;
 294         unsigned int mark;
 295         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 296 };
 297
 298 struct dlm_nodes {
 299         struct config_group ns_group;
 300 };
 301
 302 struct dlm_node {
 303         struct config_item item;
 304         struct list_head list; /* space->members */
 305         int nodeid;
 306         int weight;
 307         int new;
 308         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 309 };
 310
 311 static struct configfs_group_operations clusters_ops = {
 312         .make_group = make_cluster,
 313         .drop_item = drop_cluster,
 314 };
 315
 316 static struct configfs_item_operations cluster_ops = {
 317         .release = release_cluster,
 318 };
 319
 320 static struct configfs_group_operations spaces_ops = {
 321         .make_group = make_space,
 322         .drop_item = drop_space,
 323 };
 324
 325 static struct configfs_item_operations space_ops = {
 326         .release = release_space,
 327 };
 328
 329 static struct configfs_group_operations comms_ops = {
 330         .make_item = make_comm,
 331         .drop_item = drop_comm,
 332 };
 333
 334 static struct configfs_item_operations comm_ops = {
 335         .release = release_comm,
 336 };
 337
 338 static struct configfs_group_operations nodes_ops = {
 339         .make_item = make_node,
 340         .drop_item = drop_node,
 341 };
 342
 343 static struct configfs_item_operations node_ops = {
 344         .release = release_node,
 345 };
 346
 347 static const struct config_item_type clusters_type = {
 348         .ct_group_ops = &clusters_ops,
 349         .ct_owner = THIS_MODULE,
 350 };
 351
 352 static const struct config_item_type cluster_type = {
 353         .ct_item_ops = &cluster_ops,
 354         .ct_attrs = cluster_attrs,
 355         .ct_owner = THIS_MODULE,
 356 };
 357
 358 static const struct config_item_type spaces_type = {
 359         .ct_group_ops = &spaces_ops,
 360         .ct_owner = THIS_MODULE,
 361 };
 362
 363 static const struct config_item_type space_type = {
 364         .ct_item_ops = &space_ops,
 365         .ct_owner = THIS_MODULE,
 366 };
 367
 368 static const struct config_item_type comms_type = {
 369         .ct_group_ops = &comms_ops,
 370         .ct_owner = THIS_MODULE,
 371 };
 372
 373 static const struct config_item_type comm_type = {
 374         .ct_item_ops = &comm_ops,
 375         .ct_attrs = comm_attrs,
 376         .ct_owner = THIS_MODULE,
 377 };
 378
 379 static const struct config_item_type nodes_type = {
 380         .ct_group_ops = &nodes_ops,
 381         .ct_owner = THIS_MODULE,
 382 };
 383
 384 static const struct config_item_type node_type = {
 385         .ct_item_ops = &node_ops,
 386         .ct_attrs = node_attrs,
 387         .ct_owner = THIS_MODULE,
 388 };
 389
 390 static struct dlm_space *config_item_to_space(struct config_item *i)
 391 {
 392         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 393                    NULL;
 394 }
 395
 396 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 397 {
 398         return i ? container_of(i, struct dlm_comm, item) : NULL;
 399 }
 400
 401 static struct dlm_node *config_item_to_node(struct config_item *i)
 402 {
 403         return i ? container_of(i, struct dlm_node, item) : NULL;
 404 }
 405
 406 static struct config_group *make_cluster(struct config_group *g,
 407                                          const char *name)
 408 {
 409         struct dlm_cluster *cl = NULL;
 410         struct dlm_spaces *sps = NULL;
 411         struct dlm_comms *cms = NULL;
 412
 413         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 414         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 415         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 416
 417         if (!cl || !sps || !cms)
 418                 goto fail;
 419
 420         cl->sps = sps;
 421         cl->cms = cms;
 422
 423         config_group_init_type_name(&cl->group, name, &cluster_type);
 424         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 425         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 426
 427         configfs_add_default_group(&sps->ss_group, &cl->group);
 428         configfs_add_default_group(&cms->cs_group, &cl->group);
 429
 430         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 431         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 432         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 433         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 434         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 435         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 436         cl->cl_log_debug = dlm_config.ci_log_debug;
 437         cl->cl_log_info = dlm_config.ci_log_info;
 438         cl->cl_protocol = dlm_config.ci_protocol;
 439 #ifdef CONFIG_DLM_DEPRECATED_API
 440         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 441 #endif
 442         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 443         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 444         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 445                DLM_LOCKSPACE_LEN);
 446
 447         space_list = &sps->ss_group;
 448         comm_list = &cms->cs_group;
 449         return &cl->group;
 450
 451  fail:
 452         kfree(cl);
 453         kfree(sps);
 454         kfree(cms);
 455         return ERR_PTR(-ENOMEM);
 456 }
 457
 458 static void drop_cluster(struct config_group *g, struct config_item *i)
 459 {
 460         struct dlm_cluster *cl = config_item_to_cluster(i);
 461
 462         configfs_remove_default_groups(&cl->group);
 463
 464         space_list = NULL;
 465         comm_list = NULL;
 466
 467         config_item_put(i);
 468 }
 469
 470 static void release_cluster(struct config_item *i)
 471 {
 472         struct dlm_cluster *cl = config_item_to_cluster(i);
 473
 474         kfree(cl->sps);
 475         kfree(cl->cms);
 476         kfree(cl);
 477 }
 478
 479 static struct config_group *make_space(struct config_group *g, const char *name)
 480 {
 481         struct dlm_space *sp = NULL;
 482         struct dlm_nodes *nds = NULL;
 483
 484         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 485         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 486
 487         if (!sp || !nds)
 488                 goto fail;
 489
 490         config_group_init_type_name(&sp->group, name, &space_type);
 491
 492         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 493         configfs_add_default_group(&nds->ns_group, &sp->group);
 494
 495         INIT_LIST_HEAD(&sp->members);
 496         mutex_init(&sp->members_lock);
 497         sp->members_count = 0;
 498         sp->nds = nds;
 499         return &sp->group;
 500
 501  fail:
 502         kfree(sp);
 503         kfree(nds);
 504         return ERR_PTR(-ENOMEM);
 505 }
 506
 507 static void drop_space(struct config_group *g, struct config_item *i)
 508 {
 509         struct dlm_space *sp = config_item_to_space(i);
 510
 511         /* assert list_empty(&sp->members) */
 512
 513         configfs_remove_default_groups(&sp->group);
 514         config_item_put(i);
 515 }
 516
 517 static void release_space(struct config_item *i)
 518 {
 519         struct dlm_space *sp = config_item_to_space(i);
 520         kfree(sp->nds);
 521         kfree(sp);
 522 }
 523
 524 static struct config_item *make_comm(struct config_group *g, const char *name)
 525 {
 526         struct dlm_comm *cm;
 527
 528         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 529         if (!cm)
 530                 return ERR_PTR(-ENOMEM);
 531
 532         config_item_init_type_name(&cm->item, name, &comm_type);
 533
 534         cm->seq = dlm_comm_count++;
 535         if (!cm->seq)
 536                 cm->seq = dlm_comm_count++;
 537
 538         cm->nodeid = -1;
 539         cm->local = 0;
 540         cm->addr_count = 0;
 541         cm->mark = 0;
 542         return &cm->item;
 543 }
 544
 545 static void drop_comm(struct config_group *g, struct config_item *i)
 546 {
 547         struct dlm_comm *cm = config_item_to_comm(i);
 548         if (local_comm == cm)
 549                 local_comm = NULL;
 550         dlm_midcomms_close(cm->nodeid);
 551         while (cm->addr_count--)
 552                 kfree(cm->addr[cm->addr_count]);
 553         config_item_put(i);
 554 }
 555
 556 static void release_comm(struct config_item *i)
 557 {
 558         struct dlm_comm *cm = config_item_to_comm(i);
 559         kfree(cm);
 560 }
 561
 562 static struct config_item *make_node(struct config_group *g, const char *name)
 563 {
 564         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 565         struct dlm_node *nd;
 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 = -1;
 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
 576         mutex_lock(&sp->members_lock);
 577         list_add(&nd->list, &sp->members);
 578         sp->members_count++;
 579         mutex_unlock(&sp->members_lock);
 580
 581         return &nd->item;
 582 }
 583
 584 static void drop_node(struct config_group *g, struct config_item *i)
 585 {
 586         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 587         struct dlm_node *nd = config_item_to_node(i);
 588
 589         mutex_lock(&sp->members_lock);
 590         list_del(&nd->list);
 591         sp->members_count--;
 592         mutex_unlock(&sp->members_lock);
 593
 594         config_item_put(i);
 595 }
 596
 597 static void release_node(struct config_item *i)
 598 {
 599         struct dlm_node *nd = config_item_to_node(i);
 600         kfree(nd);
 601 }
 602
 603 static struct dlm_clusters clusters_root = {
 604         .subsys = {
 605                 .su_group = {
 606                         .cg_item = {
 607                                 .ci_namebuf = "dlm",
 608                                 .ci_type = &clusters_type,
 609                         },
 610                 },
 611         },
 612 };
 613
 614 int __init dlm_config_init(void)
 615 {
 616         config_group_init(&clusters_root.subsys.su_group);
 617         mutex_init(&clusters_root.subsys.su_mutex);
 618         return configfs_register_subsystem(&clusters_root.subsys);
 619 }
 620
 621 void dlm_config_exit(void)
 622 {
 623         configfs_unregister_subsystem(&clusters_root.subsys);
 624 }
 625
 626 /*
 627  * Functions for user space to read/write attributes
 628  */
 629
 630 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 631 {
 632         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 633 }
 634
 635 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 636                                  size_t len)
 637 {
 638         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 639
 640         if (rc)
 641                 return rc;
 642         return len;
 643 }
 644
 645 static ssize_t comm_local_show(struct config_item *item, char *buf)
 646 {
 647         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 648 }
 649
 650 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 651                                 size_t len)
 652 {
 653         struct dlm_comm *cm = config_item_to_comm(item);
 654         int rc = kstrtoint(buf, 0, &cm->local);
 655
 656         if (rc)
 657                 return rc;
 658         if (cm->local && !local_comm)
 659                 local_comm = cm;
 660         return len;
 661 }
 662
 663 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 664                 size_t len)
 665 {
 666         struct dlm_comm *cm = config_item_to_comm(item);
 667         struct sockaddr_storage *addr;
 668         int rv;
 669
 670         if (len != sizeof(struct sockaddr_storage))
 671                 return -EINVAL;
 672
 673         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 674                 return -ENOSPC;
 675
 676         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 677         if (!addr)
 678                 return -ENOMEM;
 679
 680         memcpy(addr, buf, len);
 681
 682         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 683         if (rv) {
 684                 kfree(addr);
 685                 return rv;
 686         }
 687
 688         cm->addr[cm->addr_count++] = addr;
 689         return len;
 690 }
 691
 692 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 693 {
 694         struct dlm_comm *cm = config_item_to_comm(item);
 695         ssize_t s;
 696         ssize_t allowance;
 697         int i;
 698         struct sockaddr_storage *addr;
 699         struct sockaddr_in *addr_in;
 700         struct sockaddr_in6 *addr_in6;
 701
 702         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 703         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 704
 705
 706         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 707         allowance = 4096;
 708         buf[0] = '\0';
 709
 710         for (i = 0; i < cm->addr_count; i++) {
 711                 addr = cm->addr[i];
 712
 713                 switch(addr->ss_family) {
 714                 case AF_INET:
 715                         addr_in = (struct sockaddr_in *)addr;
 716                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 717                         break;
 718                 case AF_INET6:
 719                         addr_in6 = (struct sockaddr_in6 *)addr;
 720                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 721                         break;
 722                 default:
 723                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 724                         break;
 725                 }
 726                 allowance -= s;
 727                 if (allowance >= 0)
 728                         strcat(buf, buf0);
 729                 else {
 730                         allowance += s;
 731                         break;
 732                 }
 733         }
 734         return 4096 - allowance;
 735 }
 736
 737 static ssize_t comm_mark_show(struct config_item *item, char *buf)
 738 {
 739         return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
 740 }
 741
 742 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
 743                                size_t len)
 744 {
 745         struct dlm_comm *comm;
 746         unsigned int mark;
 747         int rc;
 748
 749         rc = kstrtouint(buf, 0, &mark);
 750         if (rc)
 751                 return rc;
 752
 753         if (mark == 0)
 754                 mark = dlm_config.ci_mark;
 755
 756         comm = config_item_to_comm(item);
 757         rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
 758         if (rc)
 759                 return rc;
 760
 761         comm->mark = mark;
 762         return len;
 763 }
 764
 765 CONFIGFS_ATTR(comm_, nodeid);
 766 CONFIGFS_ATTR(comm_, local);
 767 CONFIGFS_ATTR(comm_, mark);
 768 CONFIGFS_ATTR_WO(comm_, addr);
 769 CONFIGFS_ATTR_RO(comm_, addr_list);
 770
 771 static struct configfs_attribute *comm_attrs[] = {
 772         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 773         [COMM_ATTR_LOCAL] = &comm_attr_local,
 774         [COMM_ATTR_ADDR] = &comm_attr_addr,
 775         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 776         [COMM_ATTR_MARK] = &comm_attr_mark,
 777         NULL,
 778 };
 779
 780 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 781 {
 782         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 783 }
 784
 785 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 786                                  size_t len)
 787 {
 788         struct dlm_node *nd = config_item_to_node(item);
 789         uint32_t seq = 0;
 790         int rc = kstrtoint(buf, 0, &nd->nodeid);
 791
 792         if (rc)
 793                 return rc;
 794         dlm_comm_seq(nd->nodeid, &seq);
 795         nd->comm_seq = seq;
 796         return len;
 797 }
 798
 799 static ssize_t node_weight_show(struct config_item *item, char *buf)
 800 {
 801         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 802 }
 803
 804 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 805                                  size_t len)
 806 {
 807         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 808
 809         if (rc)
 810                 return rc;
 811         return len;
 812 }
 813
 814 CONFIGFS_ATTR(node_, nodeid);
 815 CONFIGFS_ATTR(node_, weight);
 816
 817 static struct configfs_attribute *node_attrs[] = {
 818         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 819         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 820         NULL,
 821 };
 822
 823 /*
 824  * Functions for the dlm to get the info that's been configured
 825  */
 826
 827 static struct dlm_space *get_space(char *name)
 828 {
 829         struct config_item *i;
 830
 831         if (!space_list)
 832                 return NULL;
 833
 834         mutex_lock(&space_list->cg_subsys->su_mutex);
 835         i = config_group_find_item(space_list, name);
 836         mutex_unlock(&space_list->cg_subsys->su_mutex);
 837
 838         return config_item_to_space(i);
 839 }
 840
 841 static void put_space(struct dlm_space *sp)
 842 {
 843         config_item_put(&sp->group.cg_item);
 844 }
 845
 846 static struct dlm_comm *get_comm(int nodeid)
 847 {
 848         struct config_item *i;
 849         struct dlm_comm *cm = NULL;
 850         int found = 0;
 851
 852         if (!comm_list)
 853                 return NULL;
 854
 855         mutex_lock(&clusters_root.subsys.su_mutex);
 856
 857         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 858                 cm = config_item_to_comm(i);
 859
 860                 if (cm->nodeid != nodeid)
 861                         continue;
 862                 found = 1;
 863                 config_item_get(i);
 864                 break;
 865         }
 866         mutex_unlock(&clusters_root.subsys.su_mutex);
 867
 868         if (!found)
 869                 cm = NULL;
 870         return cm;
 871 }
 872
 873 static void put_comm(struct dlm_comm *cm)
 874 {
 875         config_item_put(&cm->item);
 876 }
 877
 878 /* caller must free mem */
 879 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 880                      int *count_out)
 881 {
 882         struct dlm_space *sp;
 883         struct dlm_node *nd;
 884         struct dlm_config_node *nodes, *node;
 885         int rv, count;
 886
 887         sp = get_space(lsname);
 888         if (!sp)
 889                 return -EEXIST;
 890
 891         mutex_lock(&sp->members_lock);
 892         if (!sp->members_count) {
 893                 rv = -EINVAL;
 894                 printk(KERN_ERR "dlm: zero members_count\n");
 895                 goto out;
 896         }
 897
 898         count = sp->members_count;
 899
 900         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 901         if (!nodes) {
 902                 rv = -ENOMEM;
 903                 goto out;
 904         }
 905
 906         node = nodes;
 907         list_for_each_entry(nd, &sp->members, list) {
 908                 node->nodeid = nd->nodeid;
 909                 node->weight = nd->weight;
 910                 node->new = nd->new;
 911                 node->comm_seq = nd->comm_seq;
 912                 node++;
 913
 914                 nd->new = 0;
 915         }
 916
 917         *count_out = count;
 918         *nodes_out = nodes;
 919         rv = 0;
 920  out:
 921         mutex_unlock(&sp->members_lock);
 922         put_space(sp);
 923         return rv;
 924 }
 925
 926 int dlm_comm_seq(int nodeid, uint32_t *seq)
 927 {
 928         struct dlm_comm *cm = get_comm(nodeid);
 929         if (!cm)
 930                 return -EEXIST;
 931         *seq = cm->seq;
 932         put_comm(cm);
 933         return 0;
 934 }
 935
 936 int dlm_our_nodeid(void)
 937 {
 938         return local_comm ? local_comm->nodeid : 0;
 939 }
 940
 941 /* num 0 is first addr, num 1 is second addr */
 942 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 943 {
 944         if (!local_comm)
 945                 return -1;
 946         if (num + 1 > local_comm->addr_count)
 947                 return -1;
 948         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 949         return 0;
 950 }
 951
 952 /* Config file defaults */
 953 #define DEFAULT_TCP_PORT       21064
 954 #define DEFAULT_RSBTBL_SIZE     1024
 955 #define DEFAULT_RECOVER_TIMER      5
 956 #define DEFAULT_TOSS_SECS         10
 957 #define DEFAULT_SCAN_SECS          5
 958 #define DEFAULT_LOG_DEBUG          0
 959 #define DEFAULT_LOG_INFO           1
 960 #define DEFAULT_PROTOCOL           DLM_PROTO_TCP
 961 #define DEFAULT_MARK               0
 962 #ifdef CONFIG_DLM_DEPRECATED_API
 963 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 964 #endif
 965 #define DEFAULT_NEW_RSB_COUNT    128
 966 #define DEFAULT_RECOVER_CALLBACKS  0
 967 #define DEFAULT_CLUSTER_NAME      ""
 968
 969 struct dlm_config_info dlm_config = {
 970         .ci_tcp_port = DEFAULT_TCP_PORT,
 971         .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
 972         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 973         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 974         .ci_toss_secs = DEFAULT_TOSS_SECS,
 975         .ci_scan_secs = DEFAULT_SCAN_SECS,
 976         .ci_log_debug = DEFAULT_LOG_DEBUG,
 977         .ci_log_info = DEFAULT_LOG_INFO,
 978         .ci_protocol = DEFAULT_PROTOCOL,
 979         .ci_mark = DEFAULT_MARK,
 980 #ifdef CONFIG_DLM_DEPRECATED_API
 981         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 982 #endif
 983         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 984         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 985         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 986 };
 987