fs/dlm/config.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3 *******************************************************************************
   4 **
   5 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   6 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   7 **
   8 **
   9 *******************************************************************************
  10 ******************************************************************************/
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/configfs.h>
  15 #include <linux/slab.h>
  16 #include <linux/in.h>
  17 #include <linux/in6.h>
  18 #include <linux/dlmconstants.h>
  19 #include <net/ipv6.h>
  20 #include <net/sock.h>
  21
  22 #include "config.h"
  23 #include "midcomms.h"
  24 #include "lowcomms.h"
  25
  26 /*
  27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid (refers to <node>)
  28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  29  * /config/dlm/<cluster>/comms/<comm>/nodeid (refers to <comm>)
  30  * /config/dlm/<cluster>/comms/<comm>/local
  31  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  32  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  33  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  34  */
  35
  36 static struct config_group *space_list;
  37 static struct config_group *comm_list;
  38 static struct dlm_comm *local_comm;
  39 static uint32_t dlm_comm_count;
  40
  41 struct dlm_clusters;
  42 struct dlm_cluster;
  43 struct dlm_spaces;
  44 struct dlm_space;
  45 struct dlm_comms;
  46 struct dlm_comm;
  47 struct dlm_nodes;
  48 struct dlm_node;
  49
  50 static struct config_group *make_cluster(struct config_group *, const char *);
  51 static void drop_cluster(struct config_group *, struct config_item *);
  52 static void release_cluster(struct config_item *);
  53 static struct config_group *make_space(struct config_group *, const char *);
  54 static void drop_space(struct config_group *, struct config_item *);
  55 static void release_space(struct config_item *);
  56 static struct config_item *make_comm(struct config_group *, const char *);
  57 static void drop_comm(struct config_group *, struct config_item *);
  58 static void release_comm(struct config_item *);
  59 static struct config_item *make_node(struct config_group *, const char *);
  60 static void drop_node(struct config_group *, struct config_item *);
  61 static void release_node(struct config_item *);
  62
  63 static struct configfs_attribute *comm_attrs[];
  64 static struct configfs_attribute *node_attrs[];
  65
  66 const struct rhashtable_params dlm_rhash_rsb_params = {
  67         .nelem_hint = 3, /* start small */
  68         .key_len = DLM_RESNAME_MAXLEN,
  69         .key_offset = offsetof(struct dlm_rsb, res_name),
  70         .head_offset = offsetof(struct dlm_rsb, res_node),
  71         .automatic_shrinking = true,
  72 };
  73
  74 struct dlm_cluster {
  75         struct config_group group;
  76         struct dlm_spaces *sps;
  77         struct dlm_comms *cms;
  78 };
  79
  80 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  81 {
  82         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  83                    NULL;
  84 }
  85
  86 enum {
  87         CLUSTER_ATTR_TCP_PORT = 0,
  88         CLUSTER_ATTR_BUFFER_SIZE,
  89         CLUSTER_ATTR_RSBTBL_SIZE,
  90         CLUSTER_ATTR_RECOVER_TIMER,
  91         CLUSTER_ATTR_TOSS_SECS,
  92         CLUSTER_ATTR_SCAN_SECS,
  93         CLUSTER_ATTR_LOG_DEBUG,
  94         CLUSTER_ATTR_LOG_INFO,
  95         CLUSTER_ATTR_PROTOCOL,
  96         CLUSTER_ATTR_MARK,
  97         CLUSTER_ATTR_NEW_RSB_COUNT,
  98         CLUSTER_ATTR_RECOVER_CALLBACKS,
  99         CLUSTER_ATTR_CLUSTER_NAME,
 100 };
 101
 102 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
 103 {
 104         return sprintf(buf, "%s\n", dlm_config.ci_cluster_name);
 105 }
 106
 107 static ssize_t cluster_cluster_name_store(struct config_item *item,
 108                                           const char *buf, size_t len)
 109 {
 110         strscpy(dlm_config.ci_cluster_name, buf,
 111                 sizeof(dlm_config.ci_cluster_name));
 112         return len;
 113 }
 114
 115 CONFIGFS_ATTR(cluster_, cluster_name);
 116
 117 static ssize_t cluster_tcp_port_show(struct config_item *item, char *buf)
 118 {
 119         return sprintf(buf, "%u\n", be16_to_cpu(dlm_config.ci_tcp_port));
 120 }
 121
 122 static int dlm_check_zero_and_dlm_running(unsigned int x)
 123 {
 124         if (!x)
 125                 return -EINVAL;
 126
 127         if (dlm_lowcomms_is_running())
 128                 return -EBUSY;
 129
 130         return 0;
 131 }
 132
 133 static ssize_t cluster_tcp_port_store(struct config_item *item,
 134                                       const char *buf, size_t len)
 135 {
 136         int rc;
 137         u16 x;
 138
 139         if (!capable(CAP_SYS_ADMIN))
 140                 return -EPERM;
 141
 142         rc = kstrtou16(buf, 0, &x);
 143         if (rc)
 144                 return rc;
 145
 146         rc = dlm_check_zero_and_dlm_running(x);
 147         if (rc)
 148                 return rc;
 149
 150         dlm_config.ci_tcp_port = cpu_to_be16(x);
 151         return len;
 152 }
 153
 154 CONFIGFS_ATTR(cluster_, tcp_port);
 155
 156 static ssize_t cluster_set(unsigned int *info_field,
 157                            int (*check_cb)(unsigned int x),
 158                            const char *buf, size_t len)
 159 {
 160         unsigned int x;
 161         int rc;
 162
 163         if (!capable(CAP_SYS_ADMIN))
 164                 return -EPERM;
 165         rc = kstrtouint(buf, 0, &x);
 166         if (rc)
 167                 return rc;
 168
 169         if (check_cb) {
 170                 rc = check_cb(x);
 171                 if (rc)
 172                         return rc;
 173         }
 174
 175         *info_field = x;
 176
 177         return len;
 178 }
 179
 180 #define CLUSTER_ATTR(name, check_cb)                                          \
 181 static ssize_t cluster_##name##_store(struct config_item *item, \
 182                 const char *buf, size_t len) \
 183 {                                                                             \
 184         return cluster_set(&dlm_config.ci_##name, check_cb, buf, len);        \
 185 }                                                                             \
 186 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 187 {                                                                             \
 188         return snprintf(buf, PAGE_SIZE, "%u\n", dlm_config.ci_##name);        \
 189 }                                                                             \
 190 CONFIGFS_ATTR(cluster_, name);
 191
 192 static int dlm_check_protocol_and_dlm_running(unsigned int x)
 193 {
 194         switch (x) {
 195         case 0:
 196                 /* TCP */
 197                 break;
 198         case 1:
 199                 /* SCTP */
 200                 break;
 201         default:
 202                 return -EINVAL;
 203         }
 204
 205         if (dlm_lowcomms_is_running())
 206                 return -EBUSY;
 207
 208         return 0;
 209 }
 210
 211 static int dlm_check_zero(unsigned int x)
 212 {
 213         if (!x)
 214                 return -EINVAL;
 215
 216         return 0;
 217 }
 218
 219 static int dlm_check_buffer_size(unsigned int x)
 220 {
 221         if (x < DLM_MAX_SOCKET_BUFSIZE)
 222                 return -EINVAL;
 223
 224         return 0;
 225 }
 226
 227 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
 228 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
 229 CLUSTER_ATTR(recover_timer, dlm_check_zero);
 230 CLUSTER_ATTR(toss_secs, dlm_check_zero);
 231 CLUSTER_ATTR(scan_secs, dlm_check_zero);
 232 CLUSTER_ATTR(log_debug, NULL);
 233 CLUSTER_ATTR(log_info, NULL);
 234 CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
 235 CLUSTER_ATTR(mark, NULL);
 236 CLUSTER_ATTR(new_rsb_count, NULL);
 237 CLUSTER_ATTR(recover_callbacks, NULL);
 238
 239 static struct configfs_attribute *cluster_attrs[] = {
 240         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 241         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 242         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 243         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 244         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 245         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 246         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 247         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 248         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 249         [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
 250         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 251         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 252         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 253         NULL,
 254 };
 255
 256 enum {
 257         COMM_ATTR_NODEID = 0,
 258         COMM_ATTR_LOCAL,
 259         COMM_ATTR_ADDR,
 260         COMM_ATTR_ADDR_LIST,
 261         COMM_ATTR_MARK,
 262 };
 263
 264 enum {
 265         NODE_ATTR_NODEID = 0,
 266         NODE_ATTR_WEIGHT,
 267 };
 268
 269 struct dlm_clusters {
 270         struct configfs_subsystem subsys;
 271 };
 272
 273 struct dlm_spaces {
 274         struct config_group ss_group;
 275 };
 276
 277 struct dlm_space {
 278         struct config_group group;
 279         struct list_head members;
 280         struct mutex members_lock;
 281         int members_count;
 282         struct dlm_nodes *nds;
 283 };
 284
 285 struct dlm_comms {
 286         struct config_group cs_group;
 287 };
 288
 289 struct dlm_comm {
 290         struct config_item item;
 291         int seq;
 292         int nodeid;
 293         int local;
 294         int addr_count;
 295         unsigned int mark;
 296         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 297 };
 298
 299 struct dlm_nodes {
 300         struct config_group ns_group;
 301 };
 302
 303 struct dlm_node {
 304         struct config_item item;
 305         struct list_head list; /* space->members */
 306         int nodeid;
 307         int weight;
 308         int new;
 309         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 310 };
 311
 312 static struct configfs_group_operations clusters_ops = {
 313         .make_group = make_cluster,
 314         .drop_item = drop_cluster,
 315 };
 316
 317 static struct configfs_item_operations cluster_ops = {
 318         .release = release_cluster,
 319 };
 320
 321 static struct configfs_group_operations spaces_ops = {
 322         .make_group = make_space,
 323         .drop_item = drop_space,
 324 };
 325
 326 static struct configfs_item_operations space_ops = {
 327         .release = release_space,
 328 };
 329
 330 static struct configfs_group_operations comms_ops = {
 331         .make_item = make_comm,
 332         .drop_item = drop_comm,
 333 };
 334
 335 static struct configfs_item_operations comm_ops = {
 336         .release = release_comm,
 337 };
 338
 339 static struct configfs_group_operations nodes_ops = {
 340         .make_item = make_node,
 341         .drop_item = drop_node,
 342 };
 343
 344 static struct configfs_item_operations node_ops = {
 345         .release = release_node,
 346 };
 347
 348 static const struct config_item_type clusters_type = {
 349         .ct_group_ops = &clusters_ops,
 350         .ct_owner = THIS_MODULE,
 351 };
 352
 353 static const struct config_item_type cluster_type = {
 354         .ct_item_ops = &cluster_ops,
 355         .ct_attrs = cluster_attrs,
 356         .ct_owner = THIS_MODULE,
 357 };
 358
 359 static const struct config_item_type spaces_type = {
 360         .ct_group_ops = &spaces_ops,
 361         .ct_owner = THIS_MODULE,
 362 };
 363
 364 static const struct config_item_type space_type = {
 365         .ct_item_ops = &space_ops,
 366         .ct_owner = THIS_MODULE,
 367 };
 368
 369 static const struct config_item_type comms_type = {
 370         .ct_group_ops = &comms_ops,
 371         .ct_owner = THIS_MODULE,
 372 };
 373
 374 static const struct config_item_type comm_type = {
 375         .ct_item_ops = &comm_ops,
 376         .ct_attrs = comm_attrs,
 377         .ct_owner = THIS_MODULE,
 378 };
 379
 380 static const struct config_item_type nodes_type = {
 381         .ct_group_ops = &nodes_ops,
 382         .ct_owner = THIS_MODULE,
 383 };
 384
 385 static const struct config_item_type node_type = {
 386         .ct_item_ops = &node_ops,
 387         .ct_attrs = node_attrs,
 388         .ct_owner = THIS_MODULE,
 389 };
 390
 391 static struct dlm_space *config_item_to_space(struct config_item *i)
 392 {
 393         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 394                    NULL;
 395 }
 396
 397 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 398 {
 399         return i ? container_of(i, struct dlm_comm, item) : NULL;
 400 }
 401
 402 static struct dlm_node *config_item_to_node(struct config_item *i)
 403 {
 404         return i ? container_of(i, struct dlm_node, item) : NULL;
 405 }
 406
 407 static struct config_group *make_cluster(struct config_group *g,
 408                                          const char *name)
 409 {
 410         struct dlm_cluster *cl = NULL;
 411         struct dlm_spaces *sps = NULL;
 412         struct dlm_comms *cms = NULL;
 413
 414         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 415         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 416         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 417
 418         if (!cl || !sps || !cms)
 419                 goto fail;
 420
 421         cl->sps = sps;
 422         cl->cms = cms;
 423
 424         config_group_init_type_name(&cl->group, name, &cluster_type);
 425         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 426         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 427
 428         configfs_add_default_group(&sps->ss_group, &cl->group);
 429         configfs_add_default_group(&cms->cs_group, &cl->group);
 430
 431         space_list = &sps->ss_group;
 432         comm_list = &cms->cs_group;
 433         return &cl->group;
 434
 435  fail:
 436         kfree(cl);
 437         kfree(sps);
 438         kfree(cms);
 439         return ERR_PTR(-ENOMEM);
 440 }
 441
 442 static void drop_cluster(struct config_group *g, struct config_item *i)
 443 {
 444         struct dlm_cluster *cl = config_item_to_cluster(i);
 445
 446         configfs_remove_default_groups(&cl->group);
 447
 448         space_list = NULL;
 449         comm_list = NULL;
 450
 451         config_item_put(i);
 452 }
 453
 454 static void release_cluster(struct config_item *i)
 455 {
 456         struct dlm_cluster *cl = config_item_to_cluster(i);
 457
 458         kfree(cl->sps);
 459         kfree(cl->cms);
 460         kfree(cl);
 461 }
 462
 463 static struct config_group *make_space(struct config_group *g, const char *name)
 464 {
 465         struct dlm_space *sp = NULL;
 466         struct dlm_nodes *nds = NULL;
 467
 468         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 469         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 470
 471         if (!sp || !nds)
 472                 goto fail;
 473
 474         config_group_init_type_name(&sp->group, name, &space_type);
 475
 476         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 477         configfs_add_default_group(&nds->ns_group, &sp->group);
 478
 479         INIT_LIST_HEAD(&sp->members);
 480         mutex_init(&sp->members_lock);
 481         sp->members_count = 0;
 482         sp->nds = nds;
 483         return &sp->group;
 484
 485  fail:
 486         kfree(sp);
 487         kfree(nds);
 488         return ERR_PTR(-ENOMEM);
 489 }
 490
 491 static void drop_space(struct config_group *g, struct config_item *i)
 492 {
 493         struct dlm_space *sp = config_item_to_space(i);
 494
 495         /* assert list_empty(&sp->members) */
 496
 497         configfs_remove_default_groups(&sp->group);
 498         config_item_put(i);
 499 }
 500
 501 static void release_space(struct config_item *i)
 502 {
 503         struct dlm_space *sp = config_item_to_space(i);
 504         kfree(sp->nds);
 505         kfree(sp);
 506 }
 507
 508 static struct config_item *make_comm(struct config_group *g, const char *name)
 509 {
 510         struct dlm_comm *cm;
 511         unsigned int nodeid;
 512         int rv;
 513
 514         rv = kstrtouint(name, 0, &nodeid);
 515         if (rv)
 516                 return ERR_PTR(rv);
 517
 518         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 519         if (!cm)
 520                 return ERR_PTR(-ENOMEM);
 521
 522         config_item_init_type_name(&cm->item, name, &comm_type);
 523
 524         cm->seq = dlm_comm_count++;
 525         if (!cm->seq)
 526                 cm->seq = dlm_comm_count++;
 527
 528         cm->nodeid = nodeid;
 529         cm->local = 0;
 530         cm->addr_count = 0;
 531         cm->mark = 0;
 532         return &cm->item;
 533 }
 534
 535 static void drop_comm(struct config_group *g, struct config_item *i)
 536 {
 537         struct dlm_comm *cm = config_item_to_comm(i);
 538         if (local_comm == cm)
 539                 local_comm = NULL;
 540         dlm_midcomms_close(cm->nodeid);
 541         while (cm->addr_count--)
 542                 kfree(cm->addr[cm->addr_count]);
 543         config_item_put(i);
 544 }
 545
 546 static void release_comm(struct config_item *i)
 547 {
 548         struct dlm_comm *cm = config_item_to_comm(i);
 549         kfree(cm);
 550 }
 551
 552 static struct config_item *make_node(struct config_group *g, const char *name)
 553 {
 554         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 555         unsigned int nodeid;
 556         struct dlm_node *nd;
 557         uint32_t seq = 0;
 558         int rv;
 559
 560         rv = kstrtouint(name, 0, &nodeid);
 561         if (rv)
 562                 return ERR_PTR(rv);
 563
 564         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 565         if (!nd)
 566                 return ERR_PTR(-ENOMEM);
 567
 568         config_item_init_type_name(&nd->item, name, &node_type);
 569         nd->nodeid = nodeid;
 570         nd->weight = 1;  /* default weight of 1 if none is set */
 571         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 572         dlm_comm_seq(nodeid, &seq, true);
 573         nd->comm_seq = seq;
 574
 575         mutex_lock(&sp->members_lock);
 576         list_add(&nd->list, &sp->members);
 577         sp->members_count++;
 578         mutex_unlock(&sp->members_lock);
 579
 580         return &nd->item;
 581 }
 582
 583 static void drop_node(struct config_group *g, struct config_item *i)
 584 {
 585         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 586         struct dlm_node *nd = config_item_to_node(i);
 587
 588         mutex_lock(&sp->members_lock);
 589         list_del(&nd->list);
 590         sp->members_count--;
 591         mutex_unlock(&sp->members_lock);
 592
 593         config_item_put(i);
 594 }
 595
 596 static void release_node(struct config_item *i)
 597 {
 598         struct dlm_node *nd = config_item_to_node(i);
 599         kfree(nd);
 600 }
 601
 602 static struct dlm_clusters clusters_root = {
 603         .subsys = {
 604                 .su_group = {
 605                         .cg_item = {
 606                                 .ci_namebuf = "dlm",
 607                                 .ci_type = &clusters_type,
 608                         },
 609                 },
 610         },
 611 };
 612
 613 int __init dlm_config_init(void)
 614 {
 615         config_group_init(&clusters_root.subsys.su_group);
 616         mutex_init(&clusters_root.subsys.su_mutex);
 617         return configfs_register_subsystem(&clusters_root.subsys);
 618 }
 619
 620 void dlm_config_exit(void)
 621 {
 622         configfs_unregister_subsystem(&clusters_root.subsys);
 623 }
 624
 625 /*
 626  * Functions for user space to read/write attributes
 627  */
 628
 629 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 630 {
 631         unsigned int nodeid;
 632         int rv;
 633
 634         rv = kstrtouint(config_item_name(item), 0, &nodeid);
 635         if (WARN_ON(rv))
 636                 return rv;
 637
 638         return sprintf(buf, "%u\n", nodeid);
 639 }
 640
 641 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 642                                  size_t len)
 643 {
 644         return len;
 645 }
 646
 647 static ssize_t comm_local_show(struct config_item *item, char *buf)
 648 {
 649         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 650 }
 651
 652 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 653                                 size_t len)
 654 {
 655         struct dlm_comm *cm = config_item_to_comm(item);
 656         int rc = kstrtoint(buf, 0, &cm->local);
 657
 658         if (rc)
 659                 return rc;
 660         if (cm->local && !local_comm)
 661                 local_comm = cm;
 662         return len;
 663 }
 664
 665 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 666                 size_t len)
 667 {
 668         struct dlm_comm *cm = config_item_to_comm(item);
 669         struct sockaddr_storage *addr;
 670         int rv;
 671
 672         if (len != sizeof(struct sockaddr_storage))
 673                 return -EINVAL;
 674
 675         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 676                 return -ENOSPC;
 677
 678         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 679         if (!addr)
 680                 return -ENOMEM;
 681
 682         memcpy(addr, buf, len);
 683
 684         rv = dlm_midcomms_addr(cm->nodeid, addr);
 685         if (rv) {
 686                 kfree(addr);
 687                 return rv;
 688         }
 689
 690         cm->addr[cm->addr_count++] = addr;
 691         return len;
 692 }
 693
 694 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 695 {
 696         struct dlm_comm *cm = config_item_to_comm(item);
 697         ssize_t s;
 698         ssize_t allowance;
 699         int i;
 700         struct sockaddr_storage *addr;
 701         struct sockaddr_in *addr_in;
 702         struct sockaddr_in6 *addr_in6;
 703
 704         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 705         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 706
 707
 708         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 709         allowance = 4096;
 710         buf[0] = '\0';
 711
 712         for (i = 0; i < cm->addr_count; i++) {
 713                 addr = cm->addr[i];
 714
 715                 switch(addr->ss_family) {
 716                 case AF_INET:
 717                         addr_in = (struct sockaddr_in *)addr;
 718                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 719                         break;
 720                 case AF_INET6:
 721                         addr_in6 = (struct sockaddr_in6 *)addr;
 722                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 723                         break;
 724                 default:
 725                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 726                         break;
 727                 }
 728                 allowance -= s;
 729                 if (allowance >= 0)
 730                         strcat(buf, buf0);
 731                 else {
 732                         allowance += s;
 733                         break;
 734                 }
 735         }
 736         return 4096 - allowance;
 737 }
 738
 739 static ssize_t comm_mark_show(struct config_item *item, char *buf)
 740 {
 741         return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
 742 }
 743
 744 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
 745                                size_t len)
 746 {
 747         struct dlm_comm *comm;
 748         unsigned int mark;
 749         int rc;
 750
 751         rc = kstrtouint(buf, 0, &mark);
 752         if (rc)
 753                 return rc;
 754
 755         if (mark == 0)
 756                 mark = dlm_config.ci_mark;
 757
 758         comm = config_item_to_comm(item);
 759         rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
 760         if (rc)
 761                 return rc;
 762
 763         comm->mark = mark;
 764         return len;
 765 }
 766
 767 CONFIGFS_ATTR(comm_, nodeid);
 768 CONFIGFS_ATTR(comm_, local);
 769 CONFIGFS_ATTR(comm_, mark);
 770 CONFIGFS_ATTR_WO(comm_, addr);
 771 CONFIGFS_ATTR_RO(comm_, addr_list);
 772
 773 static struct configfs_attribute *comm_attrs[] = {
 774         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 775         [COMM_ATTR_LOCAL] = &comm_attr_local,
 776         [COMM_ATTR_ADDR] = &comm_attr_addr,
 777         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 778         [COMM_ATTR_MARK] = &comm_attr_mark,
 779         NULL,
 780 };
 781
 782 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 783 {
 784         unsigned int nodeid;
 785         int rv;
 786
 787         rv = kstrtouint(config_item_name(item), 0, &nodeid);
 788         if (WARN_ON(rv))
 789                 return rv;
 790
 791         return sprintf(buf, "%u\n", nodeid);
 792 }
 793
 794 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 795                                  size_t len)
 796 {
 797         return len;
 798 }
 799
 800 static ssize_t node_weight_show(struct config_item *item, char *buf)
 801 {
 802         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 803 }
 804
 805 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 806                                  size_t len)
 807 {
 808         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 809
 810         if (rc)
 811                 return rc;
 812         return len;
 813 }
 814
 815 CONFIGFS_ATTR(node_, nodeid);
 816 CONFIGFS_ATTR(node_, weight);
 817
 818 static struct configfs_attribute *node_attrs[] = {
 819         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 820         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 821         NULL,
 822 };
 823
 824 /*
 825  * Functions for the dlm to get the info that's been configured
 826  */
 827
 828 static struct dlm_space *get_space(char *name)
 829 {
 830         struct config_item *i;
 831
 832         if (!space_list)
 833                 return NULL;
 834
 835         mutex_lock(&space_list->cg_subsys->su_mutex);
 836         i = config_group_find_item(space_list, name);
 837         mutex_unlock(&space_list->cg_subsys->su_mutex);
 838
 839         return config_item_to_space(i);
 840 }
 841
 842 static void put_space(struct dlm_space *sp)
 843 {
 844         config_item_put(&sp->group.cg_item);
 845 }
 846
 847 static struct dlm_comm *get_comm(int nodeid)
 848 {
 849         struct config_item *i;
 850         struct dlm_comm *cm = NULL;
 851         int found = 0;
 852
 853         if (!comm_list)
 854                 return NULL;
 855
 856         WARN_ON_ONCE(!mutex_is_locked(&clusters_root.subsys.su_mutex));
 857
 858         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 859                 cm = config_item_to_comm(i);
 860
 861                 if (cm->nodeid != nodeid)
 862                         continue;
 863                 found = 1;
 864                 config_item_get(i);
 865                 break;
 866         }
 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, bool locked)
 927 {
 928         struct dlm_comm *cm;
 929
 930         if (locked) {
 931                 cm = get_comm(nodeid);
 932         } else {
 933                 mutex_lock(&clusters_root.subsys.su_mutex);
 934                 cm = get_comm(nodeid);
 935                 mutex_unlock(&clusters_root.subsys.su_mutex);
 936         }
 937         if (!cm)
 938                 return -EEXIST;
 939
 940         *seq = cm->seq;
 941         put_comm(cm);
 942         return 0;
 943 }
 944
 945 int dlm_our_nodeid(void)
 946 {
 947         return local_comm->nodeid;
 948 }
 949
 950 /* num 0 is first addr, num 1 is second addr */
 951 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 952 {
 953         if (!local_comm)
 954                 return -1;
 955         if (num + 1 > local_comm->addr_count)
 956                 return -1;
 957         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 958         return 0;
 959 }
 960
 961 /* Config file defaults */
 962 #define DEFAULT_TCP_PORT       21064
 963 #define DEFAULT_RSBTBL_SIZE     1024
 964 #define DEFAULT_RECOVER_TIMER      5
 965 #define DEFAULT_TOSS_SECS         10
 966 #define DEFAULT_SCAN_SECS          5
 967 #define DEFAULT_LOG_DEBUG          0
 968 #define DEFAULT_LOG_INFO           1
 969 #define DEFAULT_PROTOCOL           DLM_PROTO_TCP
 970 #define DEFAULT_MARK               0
 971 #define DEFAULT_NEW_RSB_COUNT    128
 972 #define DEFAULT_RECOVER_CALLBACKS  0
 973 #define DEFAULT_CLUSTER_NAME      ""
 974
 975 struct dlm_config_info dlm_config = {
 976         .ci_tcp_port = cpu_to_be16(DEFAULT_TCP_PORT),
 977         .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
 978         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 979         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 980         .ci_toss_secs = DEFAULT_TOSS_SECS,
 981         .ci_scan_secs = DEFAULT_SCAN_SECS,
 982         .ci_log_debug = DEFAULT_LOG_DEBUG,
 983         .ci_log_info = DEFAULT_LOG_INFO,
 984         .ci_protocol = DEFAULT_PROTOCOL,
 985         .ci_mark = DEFAULT_MARK,
 986         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 987         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 988         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 989 };
 990