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