kernel/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         void *gps = NULL;
 347
 348         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 349         gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
 350         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 351         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 352
 353         if (!cl || !gps || !sps || !cms)
 354                 goto fail;
 355
 356         config_group_init_type_name(&cl->group, name, &cluster_type);
 357         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 358         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 359
 360         cl->group.default_groups = gps;
 361         cl->group.default_groups[0] = &sps->ss_group;
 362         cl->group.default_groups[1] = &cms->cs_group;
 363         cl->group.default_groups[2] = NULL;
 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_protocol = dlm_config.ci_protocol;
 373         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 374         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 375         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 376         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 377         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 378                DLM_LOCKSPACE_LEN);
 379
 380         space_list = &sps->ss_group;
 381         comm_list = &cms->cs_group;
 382         return &cl->group;
 383
 384  fail:
 385         kfree(cl);
 386         kfree(gps);
 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         struct config_item *tmp;
 396         int j;
 397
 398         for (j = 0; cl->group.default_groups[j]; j++) {
 399                 tmp = &cl->group.default_groups[j]->cg_item;
 400                 cl->group.default_groups[j] = NULL;
 401                 config_item_put(tmp);
 402         }
 403
 404         space_list = NULL;
 405         comm_list = NULL;
 406
 407         config_item_put(i);
 408 }
 409
 410 static void release_cluster(struct config_item *i)
 411 {
 412         struct dlm_cluster *cl = config_item_to_cluster(i);
 413         kfree(cl->group.default_groups);
 414         kfree(cl);
 415 }
 416
 417 static struct config_group *make_space(struct config_group *g, const char *name)
 418 {
 419         struct dlm_space *sp = NULL;
 420         struct dlm_nodes *nds = NULL;
 421         void *gps = NULL;
 422
 423         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 424         gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
 425         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 426
 427         if (!sp || !gps || !nds)
 428                 goto fail;
 429
 430         config_group_init_type_name(&sp->group, name, &space_type);
 431         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 432
 433         sp->group.default_groups = gps;
 434         sp->group.default_groups[0] = &nds->ns_group;
 435         sp->group.default_groups[1] = NULL;
 436
 437         INIT_LIST_HEAD(&sp->members);
 438         mutex_init(&sp->members_lock);
 439         sp->members_count = 0;
 440         return &sp->group;
 441
 442  fail:
 443         kfree(sp);
 444         kfree(gps);
 445         kfree(nds);
 446         return ERR_PTR(-ENOMEM);
 447 }
 448
 449 static void drop_space(struct config_group *g, struct config_item *i)
 450 {
 451         struct dlm_space *sp = config_item_to_space(i);
 452         struct config_item *tmp;
 453         int j;
 454
 455         /* assert list_empty(&sp->members) */
 456
 457         for (j = 0; sp->group.default_groups[j]; j++) {
 458                 tmp = &sp->group.default_groups[j]->cg_item;
 459                 sp->group.default_groups[j] = NULL;
 460                 config_item_put(tmp);
 461         }
 462
 463         config_item_put(i);
 464 }
 465
 466 static void release_space(struct config_item *i)
 467 {
 468         struct dlm_space *sp = config_item_to_space(i);
 469         kfree(sp->group.default_groups);
 470         kfree(sp);
 471 }
 472
 473 static struct config_item *make_comm(struct config_group *g, const char *name)
 474 {
 475         struct dlm_comm *cm;
 476
 477         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 478         if (!cm)
 479                 return ERR_PTR(-ENOMEM);
 480
 481         config_item_init_type_name(&cm->item, name, &comm_type);
 482
 483         cm->seq = dlm_comm_count++;
 484         if (!cm->seq)
 485                 cm->seq = dlm_comm_count++;
 486
 487         cm->nodeid = -1;
 488         cm->local = 0;
 489         cm->addr_count = 0;
 490         return &cm->item;
 491 }
 492
 493 static void drop_comm(struct config_group *g, struct config_item *i)
 494 {
 495         struct dlm_comm *cm = config_item_to_comm(i);
 496         if (local_comm == cm)
 497                 local_comm = NULL;
 498         dlm_lowcomms_close(cm->nodeid);
 499         while (cm->addr_count--)
 500                 kfree(cm->addr[cm->addr_count]);
 501         config_item_put(i);
 502 }
 503
 504 static void release_comm(struct config_item *i)
 505 {
 506         struct dlm_comm *cm = config_item_to_comm(i);
 507         kfree(cm);
 508 }
 509
 510 static struct config_item *make_node(struct config_group *g, const char *name)
 511 {
 512         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 513         struct dlm_node *nd;
 514
 515         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 516         if (!nd)
 517                 return ERR_PTR(-ENOMEM);
 518
 519         config_item_init_type_name(&nd->item, name, &node_type);
 520         nd->nodeid = -1;
 521         nd->weight = 1;  /* default weight of 1 if none is set */
 522         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 523
 524         mutex_lock(&sp->members_lock);
 525         list_add(&nd->list, &sp->members);
 526         sp->members_count++;
 527         mutex_unlock(&sp->members_lock);
 528
 529         return &nd->item;
 530 }
 531
 532 static void drop_node(struct config_group *g, struct config_item *i)
 533 {
 534         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 535         struct dlm_node *nd = config_item_to_node(i);
 536
 537         mutex_lock(&sp->members_lock);
 538         list_del(&nd->list);
 539         sp->members_count--;
 540         mutex_unlock(&sp->members_lock);
 541
 542         config_item_put(i);
 543 }
 544
 545 static void release_node(struct config_item *i)
 546 {
 547         struct dlm_node *nd = config_item_to_node(i);
 548         kfree(nd);
 549 }
 550
 551 static struct dlm_clusters clusters_root = {
 552         .subsys = {
 553                 .su_group = {
 554                         .cg_item = {
 555                                 .ci_namebuf = "dlm",
 556                                 .ci_type = &clusters_type,
 557                         },
 558                 },
 559         },
 560 };
 561
 562 int __init dlm_config_init(void)
 563 {
 564         config_group_init(&clusters_root.subsys.su_group);
 565         mutex_init(&clusters_root.subsys.su_mutex);
 566         return configfs_register_subsystem(&clusters_root.subsys);
 567 }
 568
 569 void dlm_config_exit(void)
 570 {
 571         configfs_unregister_subsystem(&clusters_root.subsys);
 572 }
 573
 574 /*
 575  * Functions for user space to read/write attributes
 576  */
 577
 578 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 579 {
 580         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 581 }
 582
 583 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 584                                  size_t len)
 585 {
 586         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 587
 588         if (rc)
 589                 return rc;
 590         return len;
 591 }
 592
 593 static ssize_t comm_local_show(struct config_item *item, char *buf)
 594 {
 595         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 596 }
 597
 598 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 599                                 size_t len)
 600 {
 601         struct dlm_comm *cm = config_item_to_comm(item);
 602         int rc = kstrtoint(buf, 0, &cm->local);
 603
 604         if (rc)
 605                 return rc;
 606         if (cm->local && !local_comm)
 607                 local_comm = cm;
 608         return len;
 609 }
 610
 611 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 612                 size_t len)
 613 {
 614         struct dlm_comm *cm = config_item_to_comm(item);
 615         struct sockaddr_storage *addr;
 616         int rv;
 617
 618         if (len != sizeof(struct sockaddr_storage))
 619                 return -EINVAL;
 620
 621         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 622                 return -ENOSPC;
 623
 624         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 625         if (!addr)
 626                 return -ENOMEM;
 627
 628         memcpy(addr, buf, len);
 629
 630         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 631         if (rv) {
 632                 kfree(addr);
 633                 return rv;
 634         }
 635
 636         cm->addr[cm->addr_count++] = addr;
 637         return len;
 638 }
 639
 640 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 641 {
 642         struct dlm_comm *cm = config_item_to_comm(item);
 643         ssize_t s;
 644         ssize_t allowance;
 645         int i;
 646         struct sockaddr_storage *addr;
 647         struct sockaddr_in *addr_in;
 648         struct sockaddr_in6 *addr_in6;
 649
 650         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 651         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 652
 653
 654         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 655         allowance = 4096;
 656         buf[0] = '\0';
 657
 658         for (i = 0; i < cm->addr_count; i++) {
 659                 addr = cm->addr[i];
 660
 661                 switch(addr->ss_family) {
 662                 case AF_INET:
 663                         addr_in = (struct sockaddr_in *)addr;
 664                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 665                         break;
 666                 case AF_INET6:
 667                         addr_in6 = (struct sockaddr_in6 *)addr;
 668                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 669                         break;
 670                 default:
 671                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 672                         break;
 673                 }
 674                 allowance -= s;
 675                 if (allowance >= 0)
 676                         strcat(buf, buf0);
 677                 else {
 678                         allowance += s;
 679                         break;
 680                 }
 681         }
 682         return 4096 - allowance;
 683 }
 684
 685 CONFIGFS_ATTR(comm_, nodeid);
 686 CONFIGFS_ATTR(comm_, local);
 687 CONFIGFS_ATTR_WO(comm_, addr);
 688 CONFIGFS_ATTR_RO(comm_, addr_list);
 689
 690 static struct configfs_attribute *comm_attrs[] = {
 691         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 692         [COMM_ATTR_LOCAL] = &comm_attr_local,
 693         [COMM_ATTR_ADDR] = &comm_attr_addr,
 694         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 695         NULL,
 696 };
 697
 698 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 699 {
 700         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 701 }
 702
 703 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 704                                  size_t len)
 705 {
 706         struct dlm_node *nd = config_item_to_node(item);
 707         uint32_t seq = 0;
 708         int rc = kstrtoint(buf, 0, &nd->nodeid);
 709
 710         if (rc)
 711                 return rc;
 712         dlm_comm_seq(nd->nodeid, &seq);
 713         nd->comm_seq = seq;
 714         return len;
 715 }
 716
 717 static ssize_t node_weight_show(struct config_item *item, char *buf)
 718 {
 719         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 720 }
 721
 722 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 723                                  size_t len)
 724 {
 725         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 726
 727         if (rc)
 728                 return rc;
 729         return len;
 730 }
 731
 732 CONFIGFS_ATTR(node_, nodeid);
 733 CONFIGFS_ATTR(node_, weight);
 734
 735 static struct configfs_attribute *node_attrs[] = {
 736         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 737         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 738         NULL,
 739 };
 740
 741 /*
 742  * Functions for the dlm to get the info that's been configured
 743  */
 744
 745 static struct dlm_space *get_space(char *name)
 746 {
 747         struct config_item *i;
 748
 749         if (!space_list)
 750                 return NULL;
 751
 752         mutex_lock(&space_list->cg_subsys->su_mutex);
 753         i = config_group_find_item(space_list, name);
 754         mutex_unlock(&space_list->cg_subsys->su_mutex);
 755
 756         return config_item_to_space(i);
 757 }
 758
 759 static void put_space(struct dlm_space *sp)
 760 {
 761         config_item_put(&sp->group.cg_item);
 762 }
 763
 764 static struct dlm_comm *get_comm(int nodeid)
 765 {
 766         struct config_item *i;
 767         struct dlm_comm *cm = NULL;
 768         int found = 0;
 769
 770         if (!comm_list)
 771                 return NULL;
 772
 773         mutex_lock(&clusters_root.subsys.su_mutex);
 774
 775         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 776                 cm = config_item_to_comm(i);
 777
 778                 if (cm->nodeid != nodeid)
 779                         continue;
 780                 found = 1;
 781                 config_item_get(i);
 782                 break;
 783         }
 784         mutex_unlock(&clusters_root.subsys.su_mutex);
 785
 786         if (!found)
 787                 cm = NULL;
 788         return cm;
 789 }
 790
 791 static void put_comm(struct dlm_comm *cm)
 792 {
 793         config_item_put(&cm->item);
 794 }
 795
 796 /* caller must free mem */
 797 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 798                      int *count_out)
 799 {
 800         struct dlm_space *sp;
 801         struct dlm_node *nd;
 802         struct dlm_config_node *nodes, *node;
 803         int rv, count;
 804
 805         sp = get_space(lsname);
 806         if (!sp)
 807                 return -EEXIST;
 808
 809         mutex_lock(&sp->members_lock);
 810         if (!sp->members_count) {
 811                 rv = -EINVAL;
 812                 printk(KERN_ERR "dlm: zero members_count\n");
 813                 goto out;
 814         }
 815
 816         count = sp->members_count;
 817
 818         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 819         if (!nodes) {
 820                 rv = -ENOMEM;
 821                 goto out;
 822         }
 823
 824         node = nodes;
 825         list_for_each_entry(nd, &sp->members, list) {
 826                 node->nodeid = nd->nodeid;
 827                 node->weight = nd->weight;
 828                 node->new = nd->new;
 829                 node->comm_seq = nd->comm_seq;
 830                 node++;
 831
 832                 nd->new = 0;
 833         }
 834
 835         *count_out = count;
 836         *nodes_out = nodes;
 837         rv = 0;
 838  out:
 839         mutex_unlock(&sp->members_lock);
 840         put_space(sp);
 841         return rv;
 842 }
 843
 844 int dlm_comm_seq(int nodeid, uint32_t *seq)
 845 {
 846         struct dlm_comm *cm = get_comm(nodeid);
 847         if (!cm)
 848                 return -EEXIST;
 849         *seq = cm->seq;
 850         put_comm(cm);
 851         return 0;
 852 }
 853
 854 int dlm_our_nodeid(void)
 855 {
 856         return local_comm ? local_comm->nodeid : 0;
 857 }
 858
 859 /* num 0 is first addr, num 1 is second addr */
 860 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 861 {
 862         if (!local_comm)
 863                 return -1;
 864         if (num + 1 > local_comm->addr_count)
 865                 return -1;
 866         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 867         return 0;
 868 }
 869
 870 /* Config file defaults */
 871 #define DEFAULT_TCP_PORT       21064
 872 #define DEFAULT_BUFFER_SIZE     4096
 873 #define DEFAULT_RSBTBL_SIZE     1024
 874 #define DEFAULT_RECOVER_TIMER      5
 875 #define DEFAULT_TOSS_SECS         10
 876 #define DEFAULT_SCAN_SECS          5
 877 #define DEFAULT_LOG_DEBUG          0
 878 #define DEFAULT_PROTOCOL           0
 879 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 880 #define DEFAULT_WAITWARN_US        0
 881 #define DEFAULT_NEW_RSB_COUNT    128
 882 #define DEFAULT_RECOVER_CALLBACKS  0
 883 #define DEFAULT_CLUSTER_NAME      ""
 884
 885 struct dlm_config_info dlm_config = {
 886         .ci_tcp_port = DEFAULT_TCP_PORT,
 887         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 888         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 889         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 890         .ci_toss_secs = DEFAULT_TOSS_SECS,
 891         .ci_scan_secs = DEFAULT_SCAN_SECS,
 892         .ci_log_debug = DEFAULT_LOG_DEBUG,
 893         .ci_protocol = DEFAULT_PROTOCOL,
 894         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 895         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 896         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 897         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 898         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 899 };
 900