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         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 350         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 351
 352         if (!cl || !gps || !sps || !cms)
 353                 goto fail;
 354
 355         config_group_init_type_name(&cl->group, name, &cluster_type);
 356         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 357         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 358
 359         configfs_add_default_group(&sps->ss_group, &cl->group);
 360         configfs_add_default_group(&cms->cs_group, &cl->group);
 361
 362         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 363         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 364         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 365         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 366         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 367         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 368         cl->cl_log_debug = dlm_config.ci_log_debug;
 369         cl->cl_protocol = dlm_config.ci_protocol;
 370         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 371         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 372         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 373         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 374         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 375                DLM_LOCKSPACE_LEN);
 376
 377         space_list = &sps->ss_group;
 378         comm_list = &cms->cs_group;
 379         return &cl->group;
 380
 381  fail:
 382         kfree(cl);
 383         kfree(sps);
 384         kfree(cms);
 385         return ERR_PTR(-ENOMEM);
 386 }
 387
 388 static void drop_cluster(struct config_group *g, struct config_item *i)
 389 {
 390         struct dlm_cluster *cl = config_item_to_cluster(i);
 391
 392         configfs_remove_default_groups(&cl->group);
 393
 394         space_list = NULL;
 395         comm_list = NULL;
 396
 397         config_item_put(i);
 398 }
 399
 400 static void release_cluster(struct config_item *i)
 401 {
 402         struct dlm_cluster *cl = config_item_to_cluster(i);
 403         kfree(cl);
 404 }
 405
 406 static struct config_group *make_space(struct config_group *g, const char *name)
 407 {
 408         struct dlm_space *sp = NULL;
 409         struct dlm_nodes *nds = NULL;
 410
 411         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 412         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 413
 414         if (!sp || !nds)
 415                 goto fail;
 416
 417         config_group_init_type_name(&sp->group, name, &space_type);
 418
 419         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 420         configfs_add_default_group(&nds->ns_group, &sp->group);
 421
 422         INIT_LIST_HEAD(&sp->members);
 423         mutex_init(&sp->members_lock);
 424         sp->members_count = 0;
 425         return &sp->group;
 426
 427  fail:
 428         kfree(sp);
 429         kfree(nds);
 430         return ERR_PTR(-ENOMEM);
 431 }
 432
 433 static void drop_space(struct config_group *g, struct config_item *i)
 434 {
 435         struct dlm_space *sp = config_item_to_space(i);
 436
 437         /* assert list_empty(&sp->members) */
 438
 439         configfs_remove_default_groups(&sp->group);
 440         config_item_put(i);
 441 }
 442
 443 static void release_space(struct config_item *i)
 444 {
 445         struct dlm_space *sp = config_item_to_space(i);
 446         kfree(sp);
 447 }
 448
 449 static struct config_item *make_comm(struct config_group *g, const char *name)
 450 {
 451         struct dlm_comm *cm;
 452
 453         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 454         if (!cm)
 455                 return ERR_PTR(-ENOMEM);
 456
 457         config_item_init_type_name(&cm->item, name, &comm_type);
 458
 459         cm->seq = dlm_comm_count++;
 460         if (!cm->seq)
 461                 cm->seq = dlm_comm_count++;
 462
 463         cm->nodeid = -1;
 464         cm->local = 0;
 465         cm->addr_count = 0;
 466         return &cm->item;
 467 }
 468
 469 static void drop_comm(struct config_group *g, struct config_item *i)
 470 {
 471         struct dlm_comm *cm = config_item_to_comm(i);
 472         if (local_comm == cm)
 473                 local_comm = NULL;
 474         dlm_lowcomms_close(cm->nodeid);
 475         while (cm->addr_count--)
 476                 kfree(cm->addr[cm->addr_count]);
 477         config_item_put(i);
 478 }
 479
 480 static void release_comm(struct config_item *i)
 481 {
 482         struct dlm_comm *cm = config_item_to_comm(i);
 483         kfree(cm);
 484 }
 485
 486 static struct config_item *make_node(struct config_group *g, const char *name)
 487 {
 488         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 489         struct dlm_node *nd;
 490
 491         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 492         if (!nd)
 493                 return ERR_PTR(-ENOMEM);
 494
 495         config_item_init_type_name(&nd->item, name, &node_type);
 496         nd->nodeid = -1;
 497         nd->weight = 1;  /* default weight of 1 if none is set */
 498         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 499
 500         mutex_lock(&sp->members_lock);
 501         list_add(&nd->list, &sp->members);
 502         sp->members_count++;
 503         mutex_unlock(&sp->members_lock);
 504
 505         return &nd->item;
 506 }
 507
 508 static void drop_node(struct config_group *g, struct config_item *i)
 509 {
 510         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 511         struct dlm_node *nd = config_item_to_node(i);
 512
 513         mutex_lock(&sp->members_lock);
 514         list_del(&nd->list);
 515         sp->members_count--;
 516         mutex_unlock(&sp->members_lock);
 517
 518         config_item_put(i);
 519 }
 520
 521 static void release_node(struct config_item *i)
 522 {
 523         struct dlm_node *nd = config_item_to_node(i);
 524         kfree(nd);
 525 }
 526
 527 static struct dlm_clusters clusters_root = {
 528         .subsys = {
 529                 .su_group = {
 530                         .cg_item = {
 531                                 .ci_namebuf = "dlm",
 532                                 .ci_type = &clusters_type,
 533                         },
 534                 },
 535         },
 536 };
 537
 538 int __init dlm_config_init(void)
 539 {
 540         config_group_init(&clusters_root.subsys.su_group);
 541         mutex_init(&clusters_root.subsys.su_mutex);
 542         return configfs_register_subsystem(&clusters_root.subsys);
 543 }
 544
 545 void dlm_config_exit(void)
 546 {
 547         configfs_unregister_subsystem(&clusters_root.subsys);
 548 }
 549
 550 /*
 551  * Functions for user space to read/write attributes
 552  */
 553
 554 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 555 {
 556         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 557 }
 558
 559 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 560                                  size_t len)
 561 {
 562         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 563
 564         if (rc)
 565                 return rc;
 566         return len;
 567 }
 568
 569 static ssize_t comm_local_show(struct config_item *item, char *buf)
 570 {
 571         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 572 }
 573
 574 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 575                                 size_t len)
 576 {
 577         struct dlm_comm *cm = config_item_to_comm(item);
 578         int rc = kstrtoint(buf, 0, &cm->local);
 579
 580         if (rc)
 581                 return rc;
 582         if (cm->local && !local_comm)
 583                 local_comm = cm;
 584         return len;
 585 }
 586
 587 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 588                 size_t len)
 589 {
 590         struct dlm_comm *cm = config_item_to_comm(item);
 591         struct sockaddr_storage *addr;
 592         int rv;
 593
 594         if (len != sizeof(struct sockaddr_storage))
 595                 return -EINVAL;
 596
 597         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 598                 return -ENOSPC;
 599
 600         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 601         if (!addr)
 602                 return -ENOMEM;
 603
 604         memcpy(addr, buf, len);
 605
 606         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 607         if (rv) {
 608                 kfree(addr);
 609                 return rv;
 610         }
 611
 612         cm->addr[cm->addr_count++] = addr;
 613         return len;
 614 }
 615
 616 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 617 {
 618         struct dlm_comm *cm = config_item_to_comm(item);
 619         ssize_t s;
 620         ssize_t allowance;
 621         int i;
 622         struct sockaddr_storage *addr;
 623         struct sockaddr_in *addr_in;
 624         struct sockaddr_in6 *addr_in6;
 625
 626         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 627         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 628
 629
 630         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 631         allowance = 4096;
 632         buf[0] = '\0';
 633
 634         for (i = 0; i < cm->addr_count; i++) {
 635                 addr = cm->addr[i];
 636
 637                 switch(addr->ss_family) {
 638                 case AF_INET:
 639                         addr_in = (struct sockaddr_in *)addr;
 640                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 641                         break;
 642                 case AF_INET6:
 643                         addr_in6 = (struct sockaddr_in6 *)addr;
 644                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 645                         break;
 646                 default:
 647                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 648                         break;
 649                 }
 650                 allowance -= s;
 651                 if (allowance >= 0)
 652                         strcat(buf, buf0);
 653                 else {
 654                         allowance += s;
 655                         break;
 656                 }
 657         }
 658         return 4096 - allowance;
 659 }
 660
 661 CONFIGFS_ATTR(comm_, nodeid);
 662 CONFIGFS_ATTR(comm_, local);
 663 CONFIGFS_ATTR_WO(comm_, addr);
 664 CONFIGFS_ATTR_RO(comm_, addr_list);
 665
 666 static struct configfs_attribute *comm_attrs[] = {
 667         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 668         [COMM_ATTR_LOCAL] = &comm_attr_local,
 669         [COMM_ATTR_ADDR] = &comm_attr_addr,
 670         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 671         NULL,
 672 };
 673
 674 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 675 {
 676         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 677 }
 678
 679 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 680                                  size_t len)
 681 {
 682         struct dlm_node *nd = config_item_to_node(item);
 683         uint32_t seq = 0;
 684         int rc = kstrtoint(buf, 0, &nd->nodeid);
 685
 686         if (rc)
 687                 return rc;
 688         dlm_comm_seq(nd->nodeid, &seq);
 689         nd->comm_seq = seq;
 690         return len;
 691 }
 692
 693 static ssize_t node_weight_show(struct config_item *item, char *buf)
 694 {
 695         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 696 }
 697
 698 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 699                                  size_t len)
 700 {
 701         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 702
 703         if (rc)
 704                 return rc;
 705         return len;
 706 }
 707
 708 CONFIGFS_ATTR(node_, nodeid);
 709 CONFIGFS_ATTR(node_, weight);
 710
 711 static struct configfs_attribute *node_attrs[] = {
 712         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 713         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 714         NULL,
 715 };
 716
 717 /*
 718  * Functions for the dlm to get the info that's been configured
 719  */
 720
 721 static struct dlm_space *get_space(char *name)
 722 {
 723         struct config_item *i;
 724
 725         if (!space_list)
 726                 return NULL;
 727
 728         mutex_lock(&space_list->cg_subsys->su_mutex);
 729         i = config_group_find_item(space_list, name);
 730         mutex_unlock(&space_list->cg_subsys->su_mutex);
 731
 732         return config_item_to_space(i);
 733 }
 734
 735 static void put_space(struct dlm_space *sp)
 736 {
 737         config_item_put(&sp->group.cg_item);
 738 }
 739
 740 static struct dlm_comm *get_comm(int nodeid)
 741 {
 742         struct config_item *i;
 743         struct dlm_comm *cm = NULL;
 744         int found = 0;
 745
 746         if (!comm_list)
 747                 return NULL;
 748
 749         mutex_lock(&clusters_root.subsys.su_mutex);
 750
 751         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 752                 cm = config_item_to_comm(i);
 753
 754                 if (cm->nodeid != nodeid)
 755                         continue;
 756                 found = 1;
 757                 config_item_get(i);
 758                 break;
 759         }
 760         mutex_unlock(&clusters_root.subsys.su_mutex);
 761
 762         if (!found)
 763                 cm = NULL;
 764         return cm;
 765 }
 766
 767 static void put_comm(struct dlm_comm *cm)
 768 {
 769         config_item_put(&cm->item);
 770 }
 771
 772 /* caller must free mem */
 773 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 774                      int *count_out)
 775 {
 776         struct dlm_space *sp;
 777         struct dlm_node *nd;
 778         struct dlm_config_node *nodes, *node;
 779         int rv, count;
 780
 781         sp = get_space(lsname);
 782         if (!sp)
 783                 return -EEXIST;
 784
 785         mutex_lock(&sp->members_lock);
 786         if (!sp->members_count) {
 787                 rv = -EINVAL;
 788                 printk(KERN_ERR "dlm: zero members_count\n");
 789                 goto out;
 790         }
 791
 792         count = sp->members_count;
 793
 794         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 795         if (!nodes) {
 796                 rv = -ENOMEM;
 797                 goto out;
 798         }
 799
 800         node = nodes;
 801         list_for_each_entry(nd, &sp->members, list) {
 802                 node->nodeid = nd->nodeid;
 803                 node->weight = nd->weight;
 804                 node->new = nd->new;
 805                 node->comm_seq = nd->comm_seq;
 806                 node++;
 807
 808                 nd->new = 0;
 809         }
 810
 811         *count_out = count;
 812         *nodes_out = nodes;
 813         rv = 0;
 814  out:
 815         mutex_unlock(&sp->members_lock);
 816         put_space(sp);
 817         return rv;
 818 }
 819
 820 int dlm_comm_seq(int nodeid, uint32_t *seq)
 821 {
 822         struct dlm_comm *cm = get_comm(nodeid);
 823         if (!cm)
 824                 return -EEXIST;
 825         *seq = cm->seq;
 826         put_comm(cm);
 827         return 0;
 828 }
 829
 830 int dlm_our_nodeid(void)
 831 {
 832         return local_comm ? local_comm->nodeid : 0;
 833 }
 834
 835 /* num 0 is first addr, num 1 is second addr */
 836 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 837 {
 838         if (!local_comm)
 839                 return -1;
 840         if (num + 1 > local_comm->addr_count)
 841                 return -1;
 842         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 843         return 0;
 844 }
 845
 846 /* Config file defaults */
 847 #define DEFAULT_TCP_PORT       21064
 848 #define DEFAULT_BUFFER_SIZE     4096
 849 #define DEFAULT_RSBTBL_SIZE     1024
 850 #define DEFAULT_RECOVER_TIMER      5
 851 #define DEFAULT_TOSS_SECS         10
 852 #define DEFAULT_SCAN_SECS          5
 853 #define DEFAULT_LOG_DEBUG          0
 854 #define DEFAULT_PROTOCOL           0
 855 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 856 #define DEFAULT_WAITWARN_US        0
 857 #define DEFAULT_NEW_RSB_COUNT    128
 858 #define DEFAULT_RECOVER_CALLBACKS  0
 859 #define DEFAULT_CLUSTER_NAME      ""
 860
 861 struct dlm_config_info dlm_config = {
 862         .ci_tcp_port = DEFAULT_TCP_PORT,
 863         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 864         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 865         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 866         .ci_toss_secs = DEFAULT_TOSS_SECS,
 867         .ci_scan_secs = DEFAULT_SCAN_SECS,
 868         .ci_log_debug = DEFAULT_LOG_DEBUG,
 869         .ci_protocol = DEFAULT_PROTOCOL,
 870         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 871         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 872         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 873         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 874         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 875 };
 876