fs/dlm/config.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   6 **
   7 **  This copyrighted material is made available to anyone wishing to use,
   8 **  modify, copy, or redistribute it subject to the terms and conditions
   9 **  of the GNU General Public License v.2.
  10 **
  11 *******************************************************************************
  12 ******************************************************************************/
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/configfs.h>
  17 #include <linux/slab.h>
  18 #include <linux/in.h>
  19 #include <linux/in6.h>
  20 #include <linux/dlmconstants.h>
  21 #include <net/ipv6.h>
  22 #include <net/sock.h>
  23
  24 #include "config.h"
  25 #include "lowcomms.h"
  26
  27 /*
  28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  29  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  30  * /config/dlm/<cluster>/comms/<comm>/nodeid
  31  * /config/dlm/<cluster>/comms/<comm>/local
  32  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  33  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  34  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  35  */
  36
  37 static struct config_group *space_list;
  38 static struct config_group *comm_list;
  39 static struct dlm_comm *local_comm;
  40 static uint32_t dlm_comm_count;
  41
  42 struct dlm_clusters;
  43 struct dlm_cluster;
  44 struct dlm_spaces;
  45 struct dlm_space;
  46 struct dlm_comms;
  47 struct dlm_comm;
  48 struct dlm_nodes;
  49 struct dlm_node;
  50
  51 static struct config_group *make_cluster(struct config_group *, const char *);
  52 static void drop_cluster(struct config_group *, struct config_item *);
  53 static void release_cluster(struct config_item *);
  54 static struct config_group *make_space(struct config_group *, const char *);
  55 static void drop_space(struct config_group *, struct config_item *);
  56 static void release_space(struct config_item *);
  57 static struct config_item *make_comm(struct config_group *, const char *);
  58 static void drop_comm(struct config_group *, struct config_item *);
  59 static void release_comm(struct config_item *);
  60 static struct config_item *make_node(struct config_group *, const char *);
  61 static void drop_node(struct config_group *, struct config_item *);
  62 static void release_node(struct config_item *);
  63
  64 static struct configfs_attribute *comm_attrs[];
  65 static struct configfs_attribute *node_attrs[];
  66
  67 struct dlm_cluster {
  68         struct config_group group;
  69         unsigned int cl_tcp_port;
  70         unsigned int cl_buffer_size;
  71         unsigned int cl_rsbtbl_size;
  72         unsigned int cl_recover_timer;
  73         unsigned int cl_toss_secs;
  74         unsigned int cl_scan_secs;
  75         unsigned int cl_log_debug;
  76         unsigned int cl_log_info;
  77         unsigned int cl_protocol;
  78         unsigned int cl_timewarn_cs;
  79         unsigned int cl_waitwarn_us;
  80         unsigned int cl_new_rsb_count;
  81         unsigned int cl_recover_callbacks;
  82         char cl_cluster_name[DLM_LOCKSPACE_LEN];
  83 };
  84
  85 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  86 {
  87         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  88                    NULL;
  89 }
  90
  91 enum {
  92         CLUSTER_ATTR_TCP_PORT = 0,
  93         CLUSTER_ATTR_BUFFER_SIZE,
  94         CLUSTER_ATTR_RSBTBL_SIZE,
  95         CLUSTER_ATTR_RECOVER_TIMER,
  96         CLUSTER_ATTR_TOSS_SECS,
  97         CLUSTER_ATTR_SCAN_SECS,
  98         CLUSTER_ATTR_LOG_DEBUG,
  99         CLUSTER_ATTR_LOG_INFO,
 100         CLUSTER_ATTR_PROTOCOL,
 101         CLUSTER_ATTR_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(timewarn_cs, 1);
 174 CLUSTER_ATTR(waitwarn_us, 0);
 175 CLUSTER_ATTR(new_rsb_count, 0);
 176 CLUSTER_ATTR(recover_callbacks, 0);
 177
 178 static struct configfs_attribute *cluster_attrs[] = {
 179         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 180         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 181         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 182         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 183         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 184         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 185         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 186         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 187         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 188         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 189         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
 190         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 191         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 192         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 193         NULL,
 194 };
 195
 196 enum {
 197         COMM_ATTR_NODEID = 0,
 198         COMM_ATTR_LOCAL,
 199         COMM_ATTR_ADDR,
 200         COMM_ATTR_ADDR_LIST,
 201 };
 202
 203 enum {
 204         NODE_ATTR_NODEID = 0,
 205         NODE_ATTR_WEIGHT,
 206 };
 207
 208 struct dlm_clusters {
 209         struct configfs_subsystem subsys;
 210 };
 211
 212 struct dlm_spaces {
 213         struct config_group ss_group;
 214 };
 215
 216 struct dlm_space {
 217         struct config_group group;
 218         struct list_head members;
 219         struct mutex members_lock;
 220         int members_count;
 221 };
 222
 223 struct dlm_comms {
 224         struct config_group cs_group;
 225 };
 226
 227 struct dlm_comm {
 228         struct config_item item;
 229         int seq;
 230         int nodeid;
 231         int local;
 232         int addr_count;
 233         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 234 };
 235
 236 struct dlm_nodes {
 237         struct config_group ns_group;
 238 };
 239
 240 struct dlm_node {
 241         struct config_item item;
 242         struct list_head list; /* space->members */
 243         int nodeid;
 244         int weight;
 245         int new;
 246         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 247 };
 248
 249 static struct configfs_group_operations clusters_ops = {
 250         .make_group = make_cluster,
 251         .drop_item = drop_cluster,
 252 };
 253
 254 static struct configfs_item_operations cluster_ops = {
 255         .release = release_cluster,
 256 };
 257
 258 static struct configfs_group_operations spaces_ops = {
 259         .make_group = make_space,
 260         .drop_item = drop_space,
 261 };
 262
 263 static struct configfs_item_operations space_ops = {
 264         .release = release_space,
 265 };
 266
 267 static struct configfs_group_operations comms_ops = {
 268         .make_item = make_comm,
 269         .drop_item = drop_comm,
 270 };
 271
 272 static struct configfs_item_operations comm_ops = {
 273         .release = release_comm,
 274 };
 275
 276 static struct configfs_group_operations nodes_ops = {
 277         .make_item = make_node,
 278         .drop_item = drop_node,
 279 };
 280
 281 static struct configfs_item_operations node_ops = {
 282         .release = release_node,
 283 };
 284
 285 static struct config_item_type clusters_type = {
 286         .ct_group_ops = &clusters_ops,
 287         .ct_owner = THIS_MODULE,
 288 };
 289
 290 static struct config_item_type cluster_type = {
 291         .ct_item_ops = &cluster_ops,
 292         .ct_attrs = cluster_attrs,
 293         .ct_owner = THIS_MODULE,
 294 };
 295
 296 static struct config_item_type spaces_type = {
 297         .ct_group_ops = &spaces_ops,
 298         .ct_owner = THIS_MODULE,
 299 };
 300
 301 static struct config_item_type space_type = {
 302         .ct_item_ops = &space_ops,
 303         .ct_owner = THIS_MODULE,
 304 };
 305
 306 static struct config_item_type comms_type = {
 307         .ct_group_ops = &comms_ops,
 308         .ct_owner = THIS_MODULE,
 309 };
 310
 311 static struct config_item_type comm_type = {
 312         .ct_item_ops = &comm_ops,
 313         .ct_attrs = comm_attrs,
 314         .ct_owner = THIS_MODULE,
 315 };
 316
 317 static struct config_item_type nodes_type = {
 318         .ct_group_ops = &nodes_ops,
 319         .ct_owner = THIS_MODULE,
 320 };
 321
 322 static struct config_item_type node_type = {
 323         .ct_item_ops = &node_ops,
 324         .ct_attrs = node_attrs,
 325         .ct_owner = THIS_MODULE,
 326 };
 327
 328 static struct dlm_space *config_item_to_space(struct config_item *i)
 329 {
 330         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 331                    NULL;
 332 }
 333
 334 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 335 {
 336         return i ? container_of(i, struct dlm_comm, item) : NULL;
 337 }
 338
 339 static struct dlm_node *config_item_to_node(struct config_item *i)
 340 {
 341         return i ? container_of(i, struct dlm_node, item) : NULL;
 342 }
 343
 344 static struct config_group *make_cluster(struct config_group *g,
 345                                          const char *name)
 346 {
 347         struct dlm_cluster *cl = NULL;
 348         struct dlm_spaces *sps = NULL;
 349         struct dlm_comms *cms = NULL;
 350
 351         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 352         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 353         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 354
 355         if (!cl || !sps || !cms)
 356                 goto fail;
 357
 358         config_group_init_type_name(&cl->group, name, &cluster_type);
 359         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 360         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 361
 362         configfs_add_default_group(&sps->ss_group, &cl->group);
 363         configfs_add_default_group(&cms->cs_group, &cl->group);
 364
 365         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 366         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 367         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 368         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 369         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 370         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 371         cl->cl_log_debug = dlm_config.ci_log_debug;
 372         cl->cl_log_info = dlm_config.ci_log_info;
 373         cl->cl_protocol = dlm_config.ci_protocol;
 374         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 375         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 376         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 377         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 378         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 379                DLM_LOCKSPACE_LEN);
 380
 381         space_list = &sps->ss_group;
 382         comm_list = &cms->cs_group;
 383         return &cl->group;
 384
 385  fail:
 386         kfree(cl);
 387         kfree(sps);
 388         kfree(cms);
 389         return ERR_PTR(-ENOMEM);
 390 }
 391
 392 static void drop_cluster(struct config_group *g, struct config_item *i)
 393 {
 394         struct dlm_cluster *cl = config_item_to_cluster(i);
 395
 396         configfs_remove_default_groups(&cl->group);
 397
 398         space_list = NULL;
 399         comm_list = NULL;
 400
 401         config_item_put(i);
 402 }
 403
 404 static void release_cluster(struct config_item *i)
 405 {
 406         struct dlm_cluster *cl = config_item_to_cluster(i);
 407         kfree(cl);
 408 }
 409
 410 static struct config_group *make_space(struct config_group *g, const char *name)
 411 {
 412         struct dlm_space *sp = NULL;
 413         struct dlm_nodes *nds = NULL;
 414
 415         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 416         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 417
 418         if (!sp || !nds)
 419                 goto fail;
 420
 421         config_group_init_type_name(&sp->group, name, &space_type);
 422
 423         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 424         configfs_add_default_group(&nds->ns_group, &sp->group);
 425
 426         INIT_LIST_HEAD(&sp->members);
 427         mutex_init(&sp->members_lock);
 428         sp->members_count = 0;
 429         return &sp->group;
 430
 431  fail:
 432         kfree(sp);
 433         kfree(nds);
 434         return ERR_PTR(-ENOMEM);
 435 }
 436
 437 static void drop_space(struct config_group *g, struct config_item *i)
 438 {
 439         struct dlm_space *sp = config_item_to_space(i);
 440
 441         /* assert list_empty(&sp->members) */
 442
 443         configfs_remove_default_groups(&sp->group);
 444         config_item_put(i);
 445 }
 446
 447 static void release_space(struct config_item *i)
 448 {
 449         struct dlm_space *sp = config_item_to_space(i);
 450         kfree(sp);
 451 }
 452
 453 static struct config_item *make_comm(struct config_group *g, const char *name)
 454 {
 455         struct dlm_comm *cm;
 456
 457         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 458         if (!cm)
 459                 return ERR_PTR(-ENOMEM);
 460
 461         config_item_init_type_name(&cm->item, name, &comm_type);
 462
 463         cm->seq = dlm_comm_count++;
 464         if (!cm->seq)
 465                 cm->seq = dlm_comm_count++;
 466
 467         cm->nodeid = -1;
 468         cm->local = 0;
 469         cm->addr_count = 0;
 470         return &cm->item;
 471 }
 472
 473 static void drop_comm(struct config_group *g, struct config_item *i)
 474 {
 475         struct dlm_comm *cm = config_item_to_comm(i);
 476         if (local_comm == cm)
 477                 local_comm = NULL;
 478         dlm_lowcomms_close(cm->nodeid);
 479         while (cm->addr_count--)
 480                 kfree(cm->addr[cm->addr_count]);
 481         config_item_put(i);
 482 }
 483
 484 static void release_comm(struct config_item *i)
 485 {
 486         struct dlm_comm *cm = config_item_to_comm(i);
 487         kfree(cm);
 488 }
 489
 490 static struct config_item *make_node(struct config_group *g, const char *name)
 491 {
 492         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 493         struct dlm_node *nd;
 494
 495         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 496         if (!nd)
 497                 return ERR_PTR(-ENOMEM);
 498
 499         config_item_init_type_name(&nd->item, name, &node_type);
 500         nd->nodeid = -1;
 501         nd->weight = 1;  /* default weight of 1 if none is set */
 502         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 503
 504         mutex_lock(&sp->members_lock);
 505         list_add(&nd->list, &sp->members);
 506         sp->members_count++;
 507         mutex_unlock(&sp->members_lock);
 508
 509         return &nd->item;
 510 }
 511
 512 static void drop_node(struct config_group *g, struct config_item *i)
 513 {
 514         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 515         struct dlm_node *nd = config_item_to_node(i);
 516
 517         mutex_lock(&sp->members_lock);
 518         list_del(&nd->list);
 519         sp->members_count--;
 520         mutex_unlock(&sp->members_lock);
 521
 522         config_item_put(i);
 523 }
 524
 525 static void release_node(struct config_item *i)
 526 {
 527         struct dlm_node *nd = config_item_to_node(i);
 528         kfree(nd);
 529 }
 530
 531 static struct dlm_clusters clusters_root = {
 532         .subsys = {
 533                 .su_group = {
 534                         .cg_item = {
 535                                 .ci_namebuf = "dlm",
 536                                 .ci_type = &clusters_type,
 537                         },
 538                 },
 539         },
 540 };
 541
 542 int __init dlm_config_init(void)
 543 {
 544         config_group_init(&clusters_root.subsys.su_group);
 545         mutex_init(&clusters_root.subsys.su_mutex);
 546         return configfs_register_subsystem(&clusters_root.subsys);
 547 }
 548
 549 void dlm_config_exit(void)
 550 {
 551         configfs_unregister_subsystem(&clusters_root.subsys);
 552 }
 553
 554 /*
 555  * Functions for user space to read/write attributes
 556  */
 557
 558 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 559 {
 560         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 561 }
 562
 563 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 564                                  size_t len)
 565 {
 566         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 567
 568         if (rc)
 569                 return rc;
 570         return len;
 571 }
 572
 573 static ssize_t comm_local_show(struct config_item *item, char *buf)
 574 {
 575         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 576 }
 577
 578 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 579                                 size_t len)
 580 {
 581         struct dlm_comm *cm = config_item_to_comm(item);
 582         int rc = kstrtoint(buf, 0, &cm->local);
 583
 584         if (rc)
 585                 return rc;
 586         if (cm->local && !local_comm)
 587                 local_comm = cm;
 588         return len;
 589 }
 590
 591 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 592                 size_t len)
 593 {
 594         struct dlm_comm *cm = config_item_to_comm(item);
 595         struct sockaddr_storage *addr;
 596         int rv;
 597
 598         if (len != sizeof(struct sockaddr_storage))
 599                 return -EINVAL;
 600
 601         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 602                 return -ENOSPC;
 603
 604         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 605         if (!addr)
 606                 return -ENOMEM;
 607
 608         memcpy(addr, buf, len);
 609
 610         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 611         if (rv) {
 612                 kfree(addr);
 613                 return rv;
 614         }
 615
 616         cm->addr[cm->addr_count++] = addr;
 617         return len;
 618 }
 619
 620 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 621 {
 622         struct dlm_comm *cm = config_item_to_comm(item);
 623         ssize_t s;
 624         ssize_t allowance;
 625         int i;
 626         struct sockaddr_storage *addr;
 627         struct sockaddr_in *addr_in;
 628         struct sockaddr_in6 *addr_in6;
 629
 630         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 631         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 632
 633
 634         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 635         allowance = 4096;
 636         buf[0] = '\0';
 637
 638         for (i = 0; i < cm->addr_count; i++) {
 639                 addr = cm->addr[i];
 640
 641                 switch(addr->ss_family) {
 642                 case AF_INET:
 643                         addr_in = (struct sockaddr_in *)addr;
 644                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 645                         break;
 646                 case AF_INET6:
 647                         addr_in6 = (struct sockaddr_in6 *)addr;
 648                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 649                         break;
 650                 default:
 651                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 652                         break;
 653                 }
 654                 allowance -= s;
 655                 if (allowance >= 0)
 656                         strcat(buf, buf0);
 657                 else {
 658                         allowance += s;
 659                         break;
 660                 }
 661         }
 662         return 4096 - allowance;
 663 }
 664
 665 CONFIGFS_ATTR(comm_, nodeid);
 666 CONFIGFS_ATTR(comm_, local);
 667 CONFIGFS_ATTR_WO(comm_, addr);
 668 CONFIGFS_ATTR_RO(comm_, addr_list);
 669
 670 static struct configfs_attribute *comm_attrs[] = {
 671         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 672         [COMM_ATTR_LOCAL] = &comm_attr_local,
 673         [COMM_ATTR_ADDR] = &comm_attr_addr,
 674         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 675         NULL,
 676 };
 677
 678 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 679 {
 680         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 681 }
 682
 683 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 684                                  size_t len)
 685 {
 686         struct dlm_node *nd = config_item_to_node(item);
 687         uint32_t seq = 0;
 688         int rc = kstrtoint(buf, 0, &nd->nodeid);
 689
 690         if (rc)
 691                 return rc;
 692         dlm_comm_seq(nd->nodeid, &seq);
 693         nd->comm_seq = seq;
 694         return len;
 695 }
 696
 697 static ssize_t node_weight_show(struct config_item *item, char *buf)
 698 {
 699         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 700 }
 701
 702 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 703                                  size_t len)
 704 {
 705         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 706
 707         if (rc)
 708                 return rc;
 709         return len;
 710 }
 711
 712 CONFIGFS_ATTR(node_, nodeid);
 713 CONFIGFS_ATTR(node_, weight);
 714
 715 static struct configfs_attribute *node_attrs[] = {
 716         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 717         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 718         NULL,
 719 };
 720
 721 /*
 722  * Functions for the dlm to get the info that's been configured
 723  */
 724
 725 static struct dlm_space *get_space(char *name)
 726 {
 727         struct config_item *i;
 728
 729         if (!space_list)
 730                 return NULL;
 731
 732         mutex_lock(&space_list->cg_subsys->su_mutex);
 733         i = config_group_find_item(space_list, name);
 734         mutex_unlock(&space_list->cg_subsys->su_mutex);
 735
 736         return config_item_to_space(i);
 737 }
 738
 739 static void put_space(struct dlm_space *sp)
 740 {
 741         config_item_put(&sp->group.cg_item);
 742 }
 743
 744 static struct dlm_comm *get_comm(int nodeid)
 745 {
 746         struct config_item *i;
 747         struct dlm_comm *cm = NULL;
 748         int found = 0;
 749
 750         if (!comm_list)
 751                 return NULL;
 752
 753         mutex_lock(&clusters_root.subsys.su_mutex);
 754
 755         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 756                 cm = config_item_to_comm(i);
 757
 758                 if (cm->nodeid != nodeid)
 759                         continue;
 760                 found = 1;
 761                 config_item_get(i);
 762                 break;
 763         }
 764         mutex_unlock(&clusters_root.subsys.su_mutex);
 765
 766         if (!found)
 767                 cm = NULL;
 768         return cm;
 769 }
 770
 771 static void put_comm(struct dlm_comm *cm)
 772 {
 773         config_item_put(&cm->item);
 774 }
 775
 776 /* caller must free mem */
 777 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 778                      int *count_out)
 779 {
 780         struct dlm_space *sp;
 781         struct dlm_node *nd;
 782         struct dlm_config_node *nodes, *node;
 783         int rv, count;
 784
 785         sp = get_space(lsname);
 786         if (!sp)
 787                 return -EEXIST;
 788
 789         mutex_lock(&sp->members_lock);
 790         if (!sp->members_count) {
 791                 rv = -EINVAL;
 792                 printk(KERN_ERR "dlm: zero members_count\n");
 793                 goto out;
 794         }
 795
 796         count = sp->members_count;
 797
 798         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 799         if (!nodes) {
 800                 rv = -ENOMEM;
 801                 goto out;
 802         }
 803
 804         node = nodes;
 805         list_for_each_entry(nd, &sp->members, list) {
 806                 node->nodeid = nd->nodeid;
 807                 node->weight = nd->weight;
 808                 node->new = nd->new;
 809                 node->comm_seq = nd->comm_seq;
 810                 node++;
 811
 812                 nd->new = 0;
 813         }
 814
 815         *count_out = count;
 816         *nodes_out = nodes;
 817         rv = 0;
 818  out:
 819         mutex_unlock(&sp->members_lock);
 820         put_space(sp);
 821         return rv;
 822 }
 823
 824 int dlm_comm_seq(int nodeid, uint32_t *seq)
 825 {
 826         struct dlm_comm *cm = get_comm(nodeid);
 827         if (!cm)
 828                 return -EEXIST;
 829         *seq = cm->seq;
 830         put_comm(cm);
 831         return 0;
 832 }
 833
 834 int dlm_our_nodeid(void)
 835 {
 836         return local_comm ? local_comm->nodeid : 0;
 837 }
 838
 839 /* num 0 is first addr, num 1 is second addr */
 840 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 841 {
 842         if (!local_comm)
 843                 return -1;
 844         if (num + 1 > local_comm->addr_count)
 845                 return -1;
 846         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 847         return 0;
 848 }
 849
 850 /* Config file defaults */
 851 #define DEFAULT_TCP_PORT       21064
 852 #define DEFAULT_BUFFER_SIZE     4096
 853 #define DEFAULT_RSBTBL_SIZE     1024
 854 #define DEFAULT_RECOVER_TIMER      5
 855 #define DEFAULT_TOSS_SECS         10
 856 #define DEFAULT_SCAN_SECS          5
 857 #define DEFAULT_LOG_DEBUG          0
 858 #define DEFAULT_LOG_INFO           1
 859 #define DEFAULT_PROTOCOL           0
 860 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 861 #define DEFAULT_WAITWARN_US        0
 862 #define DEFAULT_NEW_RSB_COUNT    128
 863 #define DEFAULT_RECOVER_CALLBACKS  0
 864 #define DEFAULT_CLUSTER_NAME      ""
 865
 866 struct dlm_config_info dlm_config = {
 867         .ci_tcp_port = DEFAULT_TCP_PORT,
 868         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 869         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 870         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 871         .ci_toss_secs = DEFAULT_TOSS_SECS,
 872         .ci_scan_secs = DEFAULT_SCAN_SECS,
 873         .ci_log_debug = DEFAULT_LOG_DEBUG,
 874         .ci_log_info = DEFAULT_LOG_INFO,
 875         .ci_protocol = DEFAULT_PROTOCOL,
 876         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 877         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 878         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 879         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 880         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 881 };
 882