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