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 "lowcomms.h"
  24
  25 /*
  26  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  28  * /config/dlm/<cluster>/comms/<comm>/nodeid
  29  * /config/dlm/<cluster>/comms/<comm>/local
  30  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  31  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  32  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  33  */
  34
  35 static struct config_group *space_list;
  36 static struct config_group *comm_list;
  37 static struct dlm_comm *local_comm;
  38 static uint32_t dlm_comm_count;
  39
  40 struct dlm_clusters;
  41 struct dlm_cluster;
  42 struct dlm_spaces;
  43 struct dlm_space;
  44 struct dlm_comms;
  45 struct dlm_comm;
  46 struct dlm_nodes;
  47 struct dlm_node;
  48
  49 static struct config_group *make_cluster(struct config_group *, const char *);
  50 static void drop_cluster(struct config_group *, struct config_item *);
  51 static void release_cluster(struct config_item *);
  52 static struct config_group *make_space(struct config_group *, const char *);
  53 static void drop_space(struct config_group *, struct config_item *);
  54 static void release_space(struct config_item *);
  55 static struct config_item *make_comm(struct config_group *, const char *);
  56 static void drop_comm(struct config_group *, struct config_item *);
  57 static void release_comm(struct config_item *);
  58 static struct config_item *make_node(struct config_group *, const char *);
  59 static void drop_node(struct config_group *, struct config_item *);
  60 static void release_node(struct config_item *);
  61
  62 static struct configfs_attribute *comm_attrs[];
  63 static struct configfs_attribute *node_attrs[];
  64
  65 struct dlm_cluster {
  66         struct config_group group;
  67         unsigned int cl_tcp_port;
  68         unsigned int cl_buffer_size;
  69         unsigned int cl_rsbtbl_size;
  70         unsigned int cl_recover_timer;
  71         unsigned int cl_toss_secs;
  72         unsigned int cl_scan_secs;
  73         unsigned int cl_log_debug;
  74         unsigned int cl_log_info;
  75         unsigned int cl_protocol;
  76         unsigned int cl_mark;
  77         unsigned int cl_timewarn_cs;
  78         unsigned int cl_waitwarn_us;
  79         unsigned int cl_new_rsb_count;
  80         unsigned int cl_recover_callbacks;
  81         char cl_cluster_name[DLM_LOCKSPACE_LEN];
  82
  83         struct dlm_spaces *sps;
  84         struct dlm_comms *cms;
  85 };
  86
  87 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  88 {
  89         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  90                    NULL;
  91 }
  92
  93 enum {
  94         CLUSTER_ATTR_TCP_PORT = 0,
  95         CLUSTER_ATTR_BUFFER_SIZE,
  96         CLUSTER_ATTR_RSBTBL_SIZE,
  97         CLUSTER_ATTR_RECOVER_TIMER,
  98         CLUSTER_ATTR_TOSS_SECS,
  99         CLUSTER_ATTR_SCAN_SECS,
 100         CLUSTER_ATTR_LOG_DEBUG,
 101         CLUSTER_ATTR_LOG_INFO,
 102         CLUSTER_ATTR_PROTOCOL,
 103         CLUSTER_ATTR_MARK,
 104         CLUSTER_ATTR_TIMEWARN_CS,
 105         CLUSTER_ATTR_WAITWARN_US,
 106         CLUSTER_ATTR_NEW_RSB_COUNT,
 107         CLUSTER_ATTR_RECOVER_CALLBACKS,
 108         CLUSTER_ATTR_CLUSTER_NAME,
 109 };
 110
 111 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
 112 {
 113         struct dlm_cluster *cl = config_item_to_cluster(item);
 114         return sprintf(buf, "%s\n", cl->cl_cluster_name);
 115 }
 116
 117 static ssize_t cluster_cluster_name_store(struct config_item *item,
 118                                           const char *buf, size_t len)
 119 {
 120         struct dlm_cluster *cl = config_item_to_cluster(item);
 121
 122         strlcpy(dlm_config.ci_cluster_name, buf,
 123                                 sizeof(dlm_config.ci_cluster_name));
 124         strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
 125         return len;
 126 }
 127
 128 CONFIGFS_ATTR(cluster_, cluster_name);
 129
 130 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 131                            int *info_field, int (*check_cb)(unsigned int x),
 132                            const char *buf, size_t len)
 133 {
 134         unsigned int x;
 135         int rc;
 136
 137         if (!capable(CAP_SYS_ADMIN))
 138                 return -EPERM;
 139         rc = kstrtouint(buf, 0, &x);
 140         if (rc)
 141                 return rc;
 142
 143         if (check_cb) {
 144                 rc = check_cb(x);
 145                 if (rc)
 146                         return rc;
 147         }
 148
 149         *cl_field = x;
 150         *info_field = x;
 151
 152         return len;
 153 }
 154
 155 #define CLUSTER_ATTR(name, check_cb)                                          \
 156 static ssize_t cluster_##name##_store(struct config_item *item, \
 157                 const char *buf, size_t len) \
 158 {                                                                             \
 159         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 160         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 161                            check_cb, buf, len);                               \
 162 }                                                                             \
 163 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 164 {                                                                             \
 165         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 166         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 167 }                                                                             \
 168 CONFIGFS_ATTR(cluster_, name);
 169
 170 static int dlm_check_zero(unsigned int x)
 171 {
 172         if (!x)
 173                 return -EINVAL;
 174
 175         return 0;
 176 }
 177
 178 static int dlm_check_buffer_size(unsigned int x)
 179 {
 180         if (x < DEFAULT_BUFFER_SIZE)
 181                 return -EINVAL;
 182
 183         return 0;
 184 }
 185
 186 CLUSTER_ATTR(tcp_port, dlm_check_zero);
 187 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
 188 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
 189 CLUSTER_ATTR(recover_timer, dlm_check_zero);
 190 CLUSTER_ATTR(toss_secs, dlm_check_zero);
 191 CLUSTER_ATTR(scan_secs, dlm_check_zero);
 192 CLUSTER_ATTR(log_debug, NULL);
 193 CLUSTER_ATTR(log_info, NULL);
 194 CLUSTER_ATTR(protocol, NULL);
 195 CLUSTER_ATTR(mark, NULL);
 196 CLUSTER_ATTR(timewarn_cs, dlm_check_zero);
 197 CLUSTER_ATTR(waitwarn_us, NULL);
 198 CLUSTER_ATTR(new_rsb_count, NULL);
 199 CLUSTER_ATTR(recover_callbacks, NULL);
 200
 201 static struct configfs_attribute *cluster_attrs[] = {
 202         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 203         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 204         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 205         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 206         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 207         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 208         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 209         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 210         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 211         [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
 212         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 213         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
 214         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 215         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 216         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 217         NULL,
 218 };
 219
 220 enum {
 221         COMM_ATTR_NODEID = 0,
 222         COMM_ATTR_LOCAL,
 223         COMM_ATTR_ADDR,
 224         COMM_ATTR_ADDR_LIST,
 225         COMM_ATTR_MARK,
 226 };
 227
 228 enum {
 229         NODE_ATTR_NODEID = 0,
 230         NODE_ATTR_WEIGHT,
 231 };
 232
 233 struct dlm_clusters {
 234         struct configfs_subsystem subsys;
 235 };
 236
 237 struct dlm_spaces {
 238         struct config_group ss_group;
 239 };
 240
 241 struct dlm_space {
 242         struct config_group group;
 243         struct list_head members;
 244         struct mutex members_lock;
 245         int members_count;
 246         struct dlm_nodes *nds;
 247 };
 248
 249 struct dlm_comms {
 250         struct config_group cs_group;
 251 };
 252
 253 struct dlm_comm {
 254         struct config_item item;
 255         int seq;
 256         int nodeid;
 257         int local;
 258         int addr_count;
 259         unsigned int mark;
 260         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 261 };
 262
 263 struct dlm_nodes {
 264         struct config_group ns_group;
 265 };
 266
 267 struct dlm_node {
 268         struct config_item item;
 269         struct list_head list; /* space->members */
 270         int nodeid;
 271         int weight;
 272         int new;
 273         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 274 };
 275
 276 static struct configfs_group_operations clusters_ops = {
 277         .make_group = make_cluster,
 278         .drop_item = drop_cluster,
 279 };
 280
 281 static struct configfs_item_operations cluster_ops = {
 282         .release = release_cluster,
 283 };
 284
 285 static struct configfs_group_operations spaces_ops = {
 286         .make_group = make_space,
 287         .drop_item = drop_space,
 288 };
 289
 290 static struct configfs_item_operations space_ops = {
 291         .release = release_space,
 292 };
 293
 294 static struct configfs_group_operations comms_ops = {
 295         .make_item = make_comm,
 296         .drop_item = drop_comm,
 297 };
 298
 299 static struct configfs_item_operations comm_ops = {
 300         .release = release_comm,
 301 };
 302
 303 static struct configfs_group_operations nodes_ops = {
 304         .make_item = make_node,
 305         .drop_item = drop_node,
 306 };
 307
 308 static struct configfs_item_operations node_ops = {
 309         .release = release_node,
 310 };
 311
 312 static const struct config_item_type clusters_type = {
 313         .ct_group_ops = &clusters_ops,
 314         .ct_owner = THIS_MODULE,
 315 };
 316
 317 static const struct config_item_type cluster_type = {
 318         .ct_item_ops = &cluster_ops,
 319         .ct_attrs = cluster_attrs,
 320         .ct_owner = THIS_MODULE,
 321 };
 322
 323 static const struct config_item_type spaces_type = {
 324         .ct_group_ops = &spaces_ops,
 325         .ct_owner = THIS_MODULE,
 326 };
 327
 328 static const struct config_item_type space_type = {
 329         .ct_item_ops = &space_ops,
 330         .ct_owner = THIS_MODULE,
 331 };
 332
 333 static const struct config_item_type comms_type = {
 334         .ct_group_ops = &comms_ops,
 335         .ct_owner = THIS_MODULE,
 336 };
 337
 338 static const struct config_item_type comm_type = {
 339         .ct_item_ops = &comm_ops,
 340         .ct_attrs = comm_attrs,
 341         .ct_owner = THIS_MODULE,
 342 };
 343
 344 static const struct config_item_type nodes_type = {
 345         .ct_group_ops = &nodes_ops,
 346         .ct_owner = THIS_MODULE,
 347 };
 348
 349 static const struct config_item_type node_type = {
 350         .ct_item_ops = &node_ops,
 351         .ct_attrs = node_attrs,
 352         .ct_owner = THIS_MODULE,
 353 };
 354
 355 static struct dlm_space *config_item_to_space(struct config_item *i)
 356 {
 357         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 358                    NULL;
 359 }
 360
 361 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 362 {
 363         return i ? container_of(i, struct dlm_comm, item) : NULL;
 364 }
 365
 366 static struct dlm_node *config_item_to_node(struct config_item *i)
 367 {
 368         return i ? container_of(i, struct dlm_node, item) : NULL;
 369 }
 370
 371 static struct config_group *make_cluster(struct config_group *g,
 372                                          const char *name)
 373 {
 374         struct dlm_cluster *cl = NULL;
 375         struct dlm_spaces *sps = NULL;
 376         struct dlm_comms *cms = NULL;
 377
 378         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 379         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 380         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 381
 382         if (!cl || !sps || !cms)
 383                 goto fail;
 384
 385         cl->sps = sps;
 386         cl->cms = cms;
 387
 388         config_group_init_type_name(&cl->group, name, &cluster_type);
 389         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 390         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 391
 392         configfs_add_default_group(&sps->ss_group, &cl->group);
 393         configfs_add_default_group(&cms->cs_group, &cl->group);
 394
 395         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 396         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 397         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 398         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 399         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 400         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 401         cl->cl_log_debug = dlm_config.ci_log_debug;
 402         cl->cl_log_info = dlm_config.ci_log_info;
 403         cl->cl_protocol = dlm_config.ci_protocol;
 404         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 405         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 406         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 407         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 408         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 409                DLM_LOCKSPACE_LEN);
 410
 411         space_list = &sps->ss_group;
 412         comm_list = &cms->cs_group;
 413         return &cl->group;
 414
 415  fail:
 416         kfree(cl);
 417         kfree(sps);
 418         kfree(cms);
 419         return ERR_PTR(-ENOMEM);
 420 }
 421
 422 static void drop_cluster(struct config_group *g, struct config_item *i)
 423 {
 424         struct dlm_cluster *cl = config_item_to_cluster(i);
 425
 426         configfs_remove_default_groups(&cl->group);
 427
 428         space_list = NULL;
 429         comm_list = NULL;
 430
 431         config_item_put(i);
 432 }
 433
 434 static void release_cluster(struct config_item *i)
 435 {
 436         struct dlm_cluster *cl = config_item_to_cluster(i);
 437
 438         kfree(cl->sps);
 439         kfree(cl->cms);
 440         kfree(cl);
 441 }
 442
 443 static struct config_group *make_space(struct config_group *g, const char *name)
 444 {
 445         struct dlm_space *sp = NULL;
 446         struct dlm_nodes *nds = NULL;
 447
 448         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 449         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 450
 451         if (!sp || !nds)
 452                 goto fail;
 453
 454         config_group_init_type_name(&sp->group, name, &space_type);
 455
 456         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 457         configfs_add_default_group(&nds->ns_group, &sp->group);
 458
 459         INIT_LIST_HEAD(&sp->members);
 460         mutex_init(&sp->members_lock);
 461         sp->members_count = 0;
 462         sp->nds = nds;
 463         return &sp->group;
 464
 465  fail:
 466         kfree(sp);
 467         kfree(nds);
 468         return ERR_PTR(-ENOMEM);
 469 }
 470
 471 static void drop_space(struct config_group *g, struct config_item *i)
 472 {
 473         struct dlm_space *sp = config_item_to_space(i);
 474
 475         /* assert list_empty(&sp->members) */
 476
 477         configfs_remove_default_groups(&sp->group);
 478         config_item_put(i);
 479 }
 480
 481 static void release_space(struct config_item *i)
 482 {
 483         struct dlm_space *sp = config_item_to_space(i);
 484         kfree(sp->nds);
 485         kfree(sp);
 486 }
 487
 488 static struct config_item *make_comm(struct config_group *g, const char *name)
 489 {
 490         struct dlm_comm *cm;
 491
 492         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 493         if (!cm)
 494                 return ERR_PTR(-ENOMEM);
 495
 496         config_item_init_type_name(&cm->item, name, &comm_type);
 497
 498         cm->seq = dlm_comm_count++;
 499         if (!cm->seq)
 500                 cm->seq = dlm_comm_count++;
 501
 502         cm->nodeid = -1;
 503         cm->local = 0;
 504         cm->addr_count = 0;
 505         cm->mark = 0;
 506         return &cm->item;
 507 }
 508
 509 static void drop_comm(struct config_group *g, struct config_item *i)
 510 {
 511         struct dlm_comm *cm = config_item_to_comm(i);
 512         if (local_comm == cm)
 513                 local_comm = NULL;
 514         dlm_lowcomms_close(cm->nodeid);
 515         while (cm->addr_count--)
 516                 kfree(cm->addr[cm->addr_count]);
 517         config_item_put(i);
 518 }
 519
 520 static void release_comm(struct config_item *i)
 521 {
 522         struct dlm_comm *cm = config_item_to_comm(i);
 523         kfree(cm);
 524 }
 525
 526 static struct config_item *make_node(struct config_group *g, const char *name)
 527 {
 528         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 529         struct dlm_node *nd;
 530
 531         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 532         if (!nd)
 533                 return ERR_PTR(-ENOMEM);
 534
 535         config_item_init_type_name(&nd->item, name, &node_type);
 536         nd->nodeid = -1;
 537         nd->weight = 1;  /* default weight of 1 if none is set */
 538         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 539
 540         mutex_lock(&sp->members_lock);
 541         list_add(&nd->list, &sp->members);
 542         sp->members_count++;
 543         mutex_unlock(&sp->members_lock);
 544
 545         return &nd->item;
 546 }
 547
 548 static void drop_node(struct config_group *g, struct config_item *i)
 549 {
 550         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 551         struct dlm_node *nd = config_item_to_node(i);
 552
 553         mutex_lock(&sp->members_lock);
 554         list_del(&nd->list);
 555         sp->members_count--;
 556         mutex_unlock(&sp->members_lock);
 557
 558         config_item_put(i);
 559 }
 560
 561 static void release_node(struct config_item *i)
 562 {
 563         struct dlm_node *nd = config_item_to_node(i);
 564         kfree(nd);
 565 }
 566
 567 static struct dlm_clusters clusters_root = {
 568         .subsys = {
 569                 .su_group = {
 570                         .cg_item = {
 571                                 .ci_namebuf = "dlm",
 572                                 .ci_type = &clusters_type,
 573                         },
 574                 },
 575         },
 576 };
 577
 578 int __init dlm_config_init(void)
 579 {
 580         config_group_init(&clusters_root.subsys.su_group);
 581         mutex_init(&clusters_root.subsys.su_mutex);
 582         return configfs_register_subsystem(&clusters_root.subsys);
 583 }
 584
 585 void dlm_config_exit(void)
 586 {
 587         configfs_unregister_subsystem(&clusters_root.subsys);
 588 }
 589
 590 /*
 591  * Functions for user space to read/write attributes
 592  */
 593
 594 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 595 {
 596         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 597 }
 598
 599 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 600                                  size_t len)
 601 {
 602         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 603
 604         if (rc)
 605                 return rc;
 606         return len;
 607 }
 608
 609 static ssize_t comm_local_show(struct config_item *item, char *buf)
 610 {
 611         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 612 }
 613
 614 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 615                                 size_t len)
 616 {
 617         struct dlm_comm *cm = config_item_to_comm(item);
 618         int rc = kstrtoint(buf, 0, &cm->local);
 619
 620         if (rc)
 621                 return rc;
 622         if (cm->local && !local_comm)
 623                 local_comm = cm;
 624         return len;
 625 }
 626
 627 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 628                 size_t len)
 629 {
 630         struct dlm_comm *cm = config_item_to_comm(item);
 631         struct sockaddr_storage *addr;
 632         int rv;
 633
 634         if (len != sizeof(struct sockaddr_storage))
 635                 return -EINVAL;
 636
 637         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 638                 return -ENOSPC;
 639
 640         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 641         if (!addr)
 642                 return -ENOMEM;
 643
 644         memcpy(addr, buf, len);
 645
 646         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 647         if (rv) {
 648                 kfree(addr);
 649                 return rv;
 650         }
 651
 652         cm->addr[cm->addr_count++] = addr;
 653         return len;
 654 }
 655
 656 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 657 {
 658         struct dlm_comm *cm = config_item_to_comm(item);
 659         ssize_t s;
 660         ssize_t allowance;
 661         int i;
 662         struct sockaddr_storage *addr;
 663         struct sockaddr_in *addr_in;
 664         struct sockaddr_in6 *addr_in6;
 665
 666         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 667         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 668
 669
 670         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 671         allowance = 4096;
 672         buf[0] = '\0';
 673
 674         for (i = 0; i < cm->addr_count; i++) {
 675                 addr = cm->addr[i];
 676
 677                 switch(addr->ss_family) {
 678                 case AF_INET:
 679                         addr_in = (struct sockaddr_in *)addr;
 680                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 681                         break;
 682                 case AF_INET6:
 683                         addr_in6 = (struct sockaddr_in6 *)addr;
 684                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 685                         break;
 686                 default:
 687                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 688                         break;
 689                 }
 690                 allowance -= s;
 691                 if (allowance >= 0)
 692                         strcat(buf, buf0);
 693                 else {
 694                         allowance += s;
 695                         break;
 696                 }
 697         }
 698         return 4096 - allowance;
 699 }
 700
 701 static ssize_t comm_mark_show(struct config_item *item, char *buf)
 702 {
 703         return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
 704 }
 705
 706 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
 707                                size_t len)
 708 {
 709         unsigned int mark;
 710         int rc;
 711
 712         rc = kstrtouint(buf, 0, &mark);
 713         if (rc)
 714                 return rc;
 715
 716         config_item_to_comm(item)->mark = mark;
 717         return len;
 718 }
 719
 720 CONFIGFS_ATTR(comm_, nodeid);
 721 CONFIGFS_ATTR(comm_, local);
 722 CONFIGFS_ATTR(comm_, mark);
 723 CONFIGFS_ATTR_WO(comm_, addr);
 724 CONFIGFS_ATTR_RO(comm_, addr_list);
 725
 726 static struct configfs_attribute *comm_attrs[] = {
 727         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 728         [COMM_ATTR_LOCAL] = &comm_attr_local,
 729         [COMM_ATTR_ADDR] = &comm_attr_addr,
 730         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 731         [COMM_ATTR_MARK] = &comm_attr_mark,
 732         NULL,
 733 };
 734
 735 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 736 {
 737         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 738 }
 739
 740 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 741                                  size_t len)
 742 {
 743         struct dlm_node *nd = config_item_to_node(item);
 744         uint32_t seq = 0;
 745         int rc = kstrtoint(buf, 0, &nd->nodeid);
 746
 747         if (rc)
 748                 return rc;
 749         dlm_comm_seq(nd->nodeid, &seq);
 750         nd->comm_seq = seq;
 751         return len;
 752 }
 753
 754 static ssize_t node_weight_show(struct config_item *item, char *buf)
 755 {
 756         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 757 }
 758
 759 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 760                                  size_t len)
 761 {
 762         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 763
 764         if (rc)
 765                 return rc;
 766         return len;
 767 }
 768
 769 CONFIGFS_ATTR(node_, nodeid);
 770 CONFIGFS_ATTR(node_, weight);
 771
 772 static struct configfs_attribute *node_attrs[] = {
 773         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 774         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 775         NULL,
 776 };
 777
 778 /*
 779  * Functions for the dlm to get the info that's been configured
 780  */
 781
 782 static struct dlm_space *get_space(char *name)
 783 {
 784         struct config_item *i;
 785
 786         if (!space_list)
 787                 return NULL;
 788
 789         mutex_lock(&space_list->cg_subsys->su_mutex);
 790         i = config_group_find_item(space_list, name);
 791         mutex_unlock(&space_list->cg_subsys->su_mutex);
 792
 793         return config_item_to_space(i);
 794 }
 795
 796 static void put_space(struct dlm_space *sp)
 797 {
 798         config_item_put(&sp->group.cg_item);
 799 }
 800
 801 static struct dlm_comm *get_comm(int nodeid)
 802 {
 803         struct config_item *i;
 804         struct dlm_comm *cm = NULL;
 805         int found = 0;
 806
 807         if (!comm_list)
 808                 return NULL;
 809
 810         mutex_lock(&clusters_root.subsys.su_mutex);
 811
 812         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 813                 cm = config_item_to_comm(i);
 814
 815                 if (cm->nodeid != nodeid)
 816                         continue;
 817                 found = 1;
 818                 config_item_get(i);
 819                 break;
 820         }
 821         mutex_unlock(&clusters_root.subsys.su_mutex);
 822
 823         if (!found)
 824                 cm = NULL;
 825         return cm;
 826 }
 827
 828 static void put_comm(struct dlm_comm *cm)
 829 {
 830         config_item_put(&cm->item);
 831 }
 832
 833 /* caller must free mem */
 834 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 835                      int *count_out)
 836 {
 837         struct dlm_space *sp;
 838         struct dlm_node *nd;
 839         struct dlm_config_node *nodes, *node;
 840         int rv, count;
 841
 842         sp = get_space(lsname);
 843         if (!sp)
 844                 return -EEXIST;
 845
 846         mutex_lock(&sp->members_lock);
 847         if (!sp->members_count) {
 848                 rv = -EINVAL;
 849                 printk(KERN_ERR "dlm: zero members_count\n");
 850                 goto out;
 851         }
 852
 853         count = sp->members_count;
 854
 855         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 856         if (!nodes) {
 857                 rv = -ENOMEM;
 858                 goto out;
 859         }
 860
 861         node = nodes;
 862         list_for_each_entry(nd, &sp->members, list) {
 863                 node->nodeid = nd->nodeid;
 864                 node->weight = nd->weight;
 865                 node->new = nd->new;
 866                 node->comm_seq = nd->comm_seq;
 867                 node++;
 868
 869                 nd->new = 0;
 870         }
 871
 872         *count_out = count;
 873         *nodes_out = nodes;
 874         rv = 0;
 875  out:
 876         mutex_unlock(&sp->members_lock);
 877         put_space(sp);
 878         return rv;
 879 }
 880
 881 int dlm_comm_seq(int nodeid, uint32_t *seq)
 882 {
 883         struct dlm_comm *cm = get_comm(nodeid);
 884         if (!cm)
 885                 return -EEXIST;
 886         *seq = cm->seq;
 887         put_comm(cm);
 888         return 0;
 889 }
 890
 891 void dlm_comm_mark(int nodeid, unsigned int *mark)
 892 {
 893         struct dlm_comm *cm;
 894
 895         cm = get_comm(nodeid);
 896         if (!cm) {
 897                 *mark = dlm_config.ci_mark;
 898                 return;
 899         }
 900
 901         if (cm->mark)
 902                 *mark = cm->mark;
 903         else
 904                 *mark = dlm_config.ci_mark;
 905
 906         put_comm(cm);
 907 }
 908
 909 int dlm_our_nodeid(void)
 910 {
 911         return local_comm ? local_comm->nodeid : 0;
 912 }
 913
 914 /* num 0 is first addr, num 1 is second addr */
 915 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 916 {
 917         if (!local_comm)
 918                 return -1;
 919         if (num + 1 > local_comm->addr_count)
 920                 return -1;
 921         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 922         return 0;
 923 }
 924
 925 /* Config file defaults */
 926 #define DEFAULT_TCP_PORT       21064
 927 #define DEFAULT_RSBTBL_SIZE     1024
 928 #define DEFAULT_RECOVER_TIMER      5
 929 #define DEFAULT_TOSS_SECS         10
 930 #define DEFAULT_SCAN_SECS          5
 931 #define DEFAULT_LOG_DEBUG          0
 932 #define DEFAULT_LOG_INFO           1
 933 #define DEFAULT_PROTOCOL           0
 934 #define DEFAULT_MARK               0
 935 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 936 #define DEFAULT_WAITWARN_US        0
 937 #define DEFAULT_NEW_RSB_COUNT    128
 938 #define DEFAULT_RECOVER_CALLBACKS  0
 939 #define DEFAULT_CLUSTER_NAME      ""
 940
 941 struct dlm_config_info dlm_config = {
 942         .ci_tcp_port = DEFAULT_TCP_PORT,
 943         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 944         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 945         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 946         .ci_toss_secs = DEFAULT_TOSS_SECS,
 947         .ci_scan_secs = DEFAULT_SCAN_SECS,
 948         .ci_log_debug = DEFAULT_LOG_DEBUG,
 949         .ci_log_info = DEFAULT_LOG_INFO,
 950         .ci_protocol = DEFAULT_PROTOCOL,
 951         .ci_mark = DEFAULT_MARK,
 952         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 953         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 954         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 955         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 956         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 957 };
 958