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/init.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         struct dlm_spaces *sps;
  85         struct dlm_comms *cms;
  86 };
  87
  88 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  89 {
  90         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  91                    NULL;
  92 }
  93
  94 enum {
  95         CLUSTER_ATTR_TCP_PORT = 0,
  96         CLUSTER_ATTR_BUFFER_SIZE,
  97         CLUSTER_ATTR_RSBTBL_SIZE,
  98         CLUSTER_ATTR_RECOVER_TIMER,
  99         CLUSTER_ATTR_TOSS_SECS,
 100         CLUSTER_ATTR_SCAN_SECS,
 101         CLUSTER_ATTR_LOG_DEBUG,
 102         CLUSTER_ATTR_LOG_INFO,
 103         CLUSTER_ATTR_PROTOCOL,
 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_zero,
 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_zero && !x)
 144                 return -EINVAL;
 145
 146         *cl_field = x;
 147         *info_field = x;
 148
 149         return len;
 150 }
 151
 152 #define CLUSTER_ATTR(name, check_zero)                                        \
 153 static ssize_t cluster_##name##_store(struct config_item *item, \
 154                 const char *buf, size_t len) \
 155 {                                                                             \
 156         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 157         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 158                            check_zero, buf, len);                             \
 159 }                                                                             \
 160 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 161 {                                                                             \
 162         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 163         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 164 }                                                                             \
 165 CONFIGFS_ATTR(cluster_, name);
 166
 167 CLUSTER_ATTR(tcp_port, 1);
 168 CLUSTER_ATTR(buffer_size, 1);
 169 CLUSTER_ATTR(rsbtbl_size, 1);
 170 CLUSTER_ATTR(recover_timer, 1);
 171 CLUSTER_ATTR(toss_secs, 1);
 172 CLUSTER_ATTR(scan_secs, 1);
 173 CLUSTER_ATTR(log_debug, 0);
 174 CLUSTER_ATTR(log_info, 0);
 175 CLUSTER_ATTR(protocol, 0);
 176 CLUSTER_ATTR(timewarn_cs, 1);
 177 CLUSTER_ATTR(waitwarn_us, 0);
 178 CLUSTER_ATTR(new_rsb_count, 0);
 179 CLUSTER_ATTR(recover_callbacks, 0);
 180
 181 static struct configfs_attribute *cluster_attrs[] = {
 182         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 183         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 184         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 185         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 186         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 187         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 188         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 189         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 190         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 191         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 192         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
 193         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 194         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 195         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 196         NULL,
 197 };
 198
 199 enum {
 200         COMM_ATTR_NODEID = 0,
 201         COMM_ATTR_LOCAL,
 202         COMM_ATTR_ADDR,
 203         COMM_ATTR_ADDR_LIST,
 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         struct dlm_nodes *nds;
 225 };
 226
 227 struct dlm_comms {
 228         struct config_group cs_group;
 229 };
 230
 231 struct dlm_comm {
 232         struct config_item item;
 233         int seq;
 234         int nodeid;
 235         int local;
 236         int addr_count;
 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         cl->sps = sps;
 363         cl->cms = cms;
 364
 365         config_group_init_type_name(&cl->group, name, &cluster_type);
 366         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 367         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 368
 369         configfs_add_default_group(&sps->ss_group, &cl->group);
 370         configfs_add_default_group(&cms->cs_group, &cl->group);
 371
 372         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 373         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 374         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 375         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 376         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 377         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 378         cl->cl_log_debug = dlm_config.ci_log_debug;
 379         cl->cl_log_info = dlm_config.ci_log_info;
 380         cl->cl_protocol = dlm_config.ci_protocol;
 381         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 382         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 383         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 384         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 385         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 386                DLM_LOCKSPACE_LEN);
 387
 388         space_list = &sps->ss_group;
 389         comm_list = &cms->cs_group;
 390         return &cl->group;
 391
 392  fail:
 393         kfree(cl);
 394         kfree(sps);
 395         kfree(cms);
 396         return ERR_PTR(-ENOMEM);
 397 }
 398
 399 static void drop_cluster(struct config_group *g, struct config_item *i)
 400 {
 401         struct dlm_cluster *cl = config_item_to_cluster(i);
 402
 403         configfs_remove_default_groups(&cl->group);
 404
 405         space_list = NULL;
 406         comm_list = NULL;
 407
 408         config_item_put(i);
 409 }
 410
 411 static void release_cluster(struct config_item *i)
 412 {
 413         struct dlm_cluster *cl = config_item_to_cluster(i);
 414
 415         kfree(cl->sps);
 416         kfree(cl->cms);
 417         kfree(cl);
 418 }
 419
 420 static struct config_group *make_space(struct config_group *g, const char *name)
 421 {
 422         struct dlm_space *sp = NULL;
 423         struct dlm_nodes *nds = NULL;
 424
 425         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 426         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 427
 428         if (!sp || !nds)
 429                 goto fail;
 430
 431         config_group_init_type_name(&sp->group, name, &space_type);
 432
 433         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 434         configfs_add_default_group(&nds->ns_group, &sp->group);
 435
 436         INIT_LIST_HEAD(&sp->members);
 437         mutex_init(&sp->members_lock);
 438         sp->members_count = 0;
 439         sp->nds = nds;
 440         return &sp->group;
 441
 442  fail:
 443         kfree(sp);
 444         kfree(nds);
 445         return ERR_PTR(-ENOMEM);
 446 }
 447
 448 static void drop_space(struct config_group *g, struct config_item *i)
 449 {
 450         struct dlm_space *sp = config_item_to_space(i);
 451
 452         /* assert list_empty(&sp->members) */
 453
 454         configfs_remove_default_groups(&sp->group);
 455         config_item_put(i);
 456 }
 457
 458 static void release_space(struct config_item *i)
 459 {
 460         struct dlm_space *sp = config_item_to_space(i);
 461         kfree(sp->nds);
 462         kfree(sp);
 463 }
 464
 465 static struct config_item *make_comm(struct config_group *g, const char *name)
 466 {
 467         struct dlm_comm *cm;
 468
 469         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 470         if (!cm)
 471                 return ERR_PTR(-ENOMEM);
 472
 473         config_item_init_type_name(&cm->item, name, &comm_type);
 474
 475         cm->seq = dlm_comm_count++;
 476         if (!cm->seq)
 477                 cm->seq = dlm_comm_count++;
 478
 479         cm->nodeid = -1;
 480         cm->local = 0;
 481         cm->addr_count = 0;
 482         return &cm->item;
 483 }
 484
 485 static void drop_comm(struct config_group *g, struct config_item *i)
 486 {
 487         struct dlm_comm *cm = config_item_to_comm(i);
 488         if (local_comm == cm)
 489                 local_comm = NULL;
 490         dlm_lowcomms_close(cm->nodeid);
 491         while (cm->addr_count--)
 492                 kfree(cm->addr[cm->addr_count]);
 493         config_item_put(i);
 494 }
 495
 496 static void release_comm(struct config_item *i)
 497 {
 498         struct dlm_comm *cm = config_item_to_comm(i);
 499         kfree(cm);
 500 }
 501
 502 static struct config_item *make_node(struct config_group *g, const char *name)
 503 {
 504         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 505         struct dlm_node *nd;
 506
 507         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 508         if (!nd)
 509                 return ERR_PTR(-ENOMEM);
 510
 511         config_item_init_type_name(&nd->item, name, &node_type);
 512         nd->nodeid = -1;
 513         nd->weight = 1;  /* default weight of 1 if none is set */
 514         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 515
 516         mutex_lock(&sp->members_lock);
 517         list_add(&nd->list, &sp->members);
 518         sp->members_count++;
 519         mutex_unlock(&sp->members_lock);
 520
 521         return &nd->item;
 522 }
 523
 524 static void drop_node(struct config_group *g, struct config_item *i)
 525 {
 526         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 527         struct dlm_node *nd = config_item_to_node(i);
 528
 529         mutex_lock(&sp->members_lock);
 530         list_del(&nd->list);
 531         sp->members_count--;
 532         mutex_unlock(&sp->members_lock);
 533
 534         config_item_put(i);
 535 }
 536
 537 static void release_node(struct config_item *i)
 538 {
 539         struct dlm_node *nd = config_item_to_node(i);
 540         kfree(nd);
 541 }
 542
 543 static struct dlm_clusters clusters_root = {
 544         .subsys = {
 545                 .su_group = {
 546                         .cg_item = {
 547                                 .ci_namebuf = "dlm",
 548                                 .ci_type = &clusters_type,
 549                         },
 550                 },
 551         },
 552 };
 553
 554 int __init dlm_config_init(void)
 555 {
 556         config_group_init(&clusters_root.subsys.su_group);
 557         mutex_init(&clusters_root.subsys.su_mutex);
 558         return configfs_register_subsystem(&clusters_root.subsys);
 559 }
 560
 561 void dlm_config_exit(void)
 562 {
 563         configfs_unregister_subsystem(&clusters_root.subsys);
 564 }
 565
 566 /*
 567  * Functions for user space to read/write attributes
 568  */
 569
 570 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 571 {
 572         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 573 }
 574
 575 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 576                                  size_t len)
 577 {
 578         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 579
 580         if (rc)
 581                 return rc;
 582         return len;
 583 }
 584
 585 static ssize_t comm_local_show(struct config_item *item, char *buf)
 586 {
 587         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 588 }
 589
 590 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 591                                 size_t len)
 592 {
 593         struct dlm_comm *cm = config_item_to_comm(item);
 594         int rc = kstrtoint(buf, 0, &cm->local);
 595
 596         if (rc)
 597                 return rc;
 598         if (cm->local && !local_comm)
 599                 local_comm = cm;
 600         return len;
 601 }
 602
 603 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 604                 size_t len)
 605 {
 606         struct dlm_comm *cm = config_item_to_comm(item);
 607         struct sockaddr_storage *addr;
 608         int rv;
 609
 610         if (len != sizeof(struct sockaddr_storage))
 611                 return -EINVAL;
 612
 613         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 614                 return -ENOSPC;
 615
 616         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 617         if (!addr)
 618                 return -ENOMEM;
 619
 620         memcpy(addr, buf, len);
 621
 622         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 623         if (rv) {
 624                 kfree(addr);
 625                 return rv;
 626         }
 627
 628         cm->addr[cm->addr_count++] = addr;
 629         return len;
 630 }
 631
 632 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 633 {
 634         struct dlm_comm *cm = config_item_to_comm(item);
 635         ssize_t s;
 636         ssize_t allowance;
 637         int i;
 638         struct sockaddr_storage *addr;
 639         struct sockaddr_in *addr_in;
 640         struct sockaddr_in6 *addr_in6;
 641
 642         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 643         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 644
 645
 646         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 647         allowance = 4096;
 648         buf[0] = '\0';
 649
 650         for (i = 0; i < cm->addr_count; i++) {
 651                 addr = cm->addr[i];
 652
 653                 switch(addr->ss_family) {
 654                 case AF_INET:
 655                         addr_in = (struct sockaddr_in *)addr;
 656                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 657                         break;
 658                 case AF_INET6:
 659                         addr_in6 = (struct sockaddr_in6 *)addr;
 660                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 661                         break;
 662                 default:
 663                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 664                         break;
 665                 }
 666                 allowance -= s;
 667                 if (allowance >= 0)
 668                         strcat(buf, buf0);
 669                 else {
 670                         allowance += s;
 671                         break;
 672                 }
 673         }
 674         return 4096 - allowance;
 675 }
 676
 677 CONFIGFS_ATTR(comm_, nodeid);
 678 CONFIGFS_ATTR(comm_, local);
 679 CONFIGFS_ATTR_WO(comm_, addr);
 680 CONFIGFS_ATTR_RO(comm_, addr_list);
 681
 682 static struct configfs_attribute *comm_attrs[] = {
 683         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 684         [COMM_ATTR_LOCAL] = &comm_attr_local,
 685         [COMM_ATTR_ADDR] = &comm_attr_addr,
 686         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 687         NULL,
 688 };
 689
 690 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 691 {
 692         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 693 }
 694
 695 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 696                                  size_t len)
 697 {
 698         struct dlm_node *nd = config_item_to_node(item);
 699         uint32_t seq = 0;
 700         int rc = kstrtoint(buf, 0, &nd->nodeid);
 701
 702         if (rc)
 703                 return rc;
 704         dlm_comm_seq(nd->nodeid, &seq);
 705         nd->comm_seq = seq;
 706         return len;
 707 }
 708
 709 static ssize_t node_weight_show(struct config_item *item, char *buf)
 710 {
 711         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 712 }
 713
 714 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 715                                  size_t len)
 716 {
 717         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 718
 719         if (rc)
 720                 return rc;
 721         return len;
 722 }
 723
 724 CONFIGFS_ATTR(node_, nodeid);
 725 CONFIGFS_ATTR(node_, weight);
 726
 727 static struct configfs_attribute *node_attrs[] = {
 728         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 729         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 730         NULL,
 731 };
 732
 733 /*
 734  * Functions for the dlm to get the info that's been configured
 735  */
 736
 737 static struct dlm_space *get_space(char *name)
 738 {
 739         struct config_item *i;
 740
 741         if (!space_list)
 742                 return NULL;
 743
 744         mutex_lock(&space_list->cg_subsys->su_mutex);
 745         i = config_group_find_item(space_list, name);
 746         mutex_unlock(&space_list->cg_subsys->su_mutex);
 747
 748         return config_item_to_space(i);
 749 }
 750
 751 static void put_space(struct dlm_space *sp)
 752 {
 753         config_item_put(&sp->group.cg_item);
 754 }
 755
 756 static struct dlm_comm *get_comm(int nodeid)
 757 {
 758         struct config_item *i;
 759         struct dlm_comm *cm = NULL;
 760         int found = 0;
 761
 762         if (!comm_list)
 763                 return NULL;
 764
 765         mutex_lock(&clusters_root.subsys.su_mutex);
 766
 767         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 768                 cm = config_item_to_comm(i);
 769
 770                 if (cm->nodeid != nodeid)
 771                         continue;
 772                 found = 1;
 773                 config_item_get(i);
 774                 break;
 775         }
 776         mutex_unlock(&clusters_root.subsys.su_mutex);
 777
 778         if (!found)
 779                 cm = NULL;
 780         return cm;
 781 }
 782
 783 static void put_comm(struct dlm_comm *cm)
 784 {
 785         config_item_put(&cm->item);
 786 }
 787
 788 /* caller must free mem */
 789 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 790                      int *count_out)
 791 {
 792         struct dlm_space *sp;
 793         struct dlm_node *nd;
 794         struct dlm_config_node *nodes, *node;
 795         int rv, count;
 796
 797         sp = get_space(lsname);
 798         if (!sp)
 799                 return -EEXIST;
 800
 801         mutex_lock(&sp->members_lock);
 802         if (!sp->members_count) {
 803                 rv = -EINVAL;
 804                 printk(KERN_ERR "dlm: zero members_count\n");
 805                 goto out;
 806         }
 807
 808         count = sp->members_count;
 809
 810         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 811         if (!nodes) {
 812                 rv = -ENOMEM;
 813                 goto out;
 814         }
 815
 816         node = nodes;
 817         list_for_each_entry(nd, &sp->members, list) {
 818                 node->nodeid = nd->nodeid;
 819                 node->weight = nd->weight;
 820                 node->new = nd->new;
 821                 node->comm_seq = nd->comm_seq;
 822                 node++;
 823
 824                 nd->new = 0;
 825         }
 826
 827         *count_out = count;
 828         *nodes_out = nodes;
 829         rv = 0;
 830  out:
 831         mutex_unlock(&sp->members_lock);
 832         put_space(sp);
 833         return rv;
 834 }
 835
 836 int dlm_comm_seq(int nodeid, uint32_t *seq)
 837 {
 838         struct dlm_comm *cm = get_comm(nodeid);
 839         if (!cm)
 840                 return -EEXIST;
 841         *seq = cm->seq;
 842         put_comm(cm);
 843         return 0;
 844 }
 845
 846 int dlm_our_nodeid(void)
 847 {
 848         return local_comm ? local_comm->nodeid : 0;
 849 }
 850
 851 /* num 0 is first addr, num 1 is second addr */
 852 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 853 {
 854         if (!local_comm)
 855                 return -1;
 856         if (num + 1 > local_comm->addr_count)
 857                 return -1;
 858         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 859         return 0;
 860 }
 861
 862 /* Config file defaults */
 863 #define DEFAULT_TCP_PORT       21064
 864 #define DEFAULT_BUFFER_SIZE     4096
 865 #define DEFAULT_RSBTBL_SIZE     1024
 866 #define DEFAULT_RECOVER_TIMER      5
 867 #define DEFAULT_TOSS_SECS         10
 868 #define DEFAULT_SCAN_SECS          5
 869 #define DEFAULT_LOG_DEBUG          0
 870 #define DEFAULT_LOG_INFO           1
 871 #define DEFAULT_PROTOCOL           0
 872 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 873 #define DEFAULT_WAITWARN_US        0
 874 #define DEFAULT_NEW_RSB_COUNT    128
 875 #define DEFAULT_RECOVER_CALLBACKS  0
 876 #define DEFAULT_CLUSTER_NAME      ""
 877
 878 struct dlm_config_info dlm_config = {
 879         .ci_tcp_port = DEFAULT_TCP_PORT,
 880         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 881         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 882         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 883         .ci_toss_secs = DEFAULT_TOSS_SECS,
 884         .ci_scan_secs = DEFAULT_SCAN_SECS,
 885         .ci_log_debug = DEFAULT_LOG_DEBUG,
 886         .ci_log_info = DEFAULT_LOG_INFO,
 887         .ci_protocol = DEFAULT_PROTOCOL,
 888         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 889         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 890         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 891         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 892         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 893 };
 894