fs/dlm/config.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3 *******************************************************************************
   4 **
   5 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   6 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   7 **
   8 **
   9 *******************************************************************************
  10 ******************************************************************************/
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/configfs.h>
  15 #include <linux/slab.h>
  16 #include <linux/in.h>
  17 #include <linux/in6.h>
  18 #include <linux/dlmconstants.h>
  19 #include <net/ipv6.h>
  20 #include <net/sock.h>
  21
  22 #include "config.h"
  23 #include "lowcomms.h"
  24
  25 /*
  26  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  28  * /config/dlm/<cluster>/comms/<comm>/nodeid
  29  * /config/dlm/<cluster>/comms/<comm>/local
  30  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  31  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  32  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  33  */
  34
  35 static struct config_group *space_list;
  36 static struct config_group *comm_list;
  37 static struct dlm_comm *local_comm;
  38 static uint32_t dlm_comm_count;
  39
  40 struct dlm_clusters;
  41 struct dlm_cluster;
  42 struct dlm_spaces;
  43 struct dlm_space;
  44 struct dlm_comms;
  45 struct dlm_comm;
  46 struct dlm_nodes;
  47 struct dlm_node;
  48
  49 static struct config_group *make_cluster(struct config_group *, const char *);
  50 static void drop_cluster(struct config_group *, struct config_item *);
  51 static void release_cluster(struct config_item *);
  52 static struct config_group *make_space(struct config_group *, const char *);
  53 static void drop_space(struct config_group *, struct config_item *);
  54 static void release_space(struct config_item *);
  55 static struct config_item *make_comm(struct config_group *, const char *);
  56 static void drop_comm(struct config_group *, struct config_item *);
  57 static void release_comm(struct config_item *);
  58 static struct config_item *make_node(struct config_group *, const char *);
  59 static void drop_node(struct config_group *, struct config_item *);
  60 static void release_node(struct config_item *);
  61
  62 static struct configfs_attribute *comm_attrs[];
  63 static struct configfs_attribute *node_attrs[];
  64
  65 struct dlm_cluster {
  66         struct config_group group;
  67         unsigned int cl_tcp_port;
  68         unsigned int cl_buffer_size;
  69         unsigned int cl_rsbtbl_size;
  70         unsigned int cl_recover_timer;
  71         unsigned int cl_toss_secs;
  72         unsigned int cl_scan_secs;
  73         unsigned int cl_log_debug;
  74         unsigned int cl_log_info;
  75         unsigned int cl_protocol;
  76         unsigned int cl_timewarn_cs;
  77         unsigned int cl_waitwarn_us;
  78         unsigned int cl_new_rsb_count;
  79         unsigned int cl_recover_callbacks;
  80         char cl_cluster_name[DLM_LOCKSPACE_LEN];
  81 };
  82
  83 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  84 {
  85         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  86                    NULL;
  87 }
  88
  89 enum {
  90         CLUSTER_ATTR_TCP_PORT = 0,
  91         CLUSTER_ATTR_BUFFER_SIZE,
  92         CLUSTER_ATTR_RSBTBL_SIZE,
  93         CLUSTER_ATTR_RECOVER_TIMER,
  94         CLUSTER_ATTR_TOSS_SECS,
  95         CLUSTER_ATTR_SCAN_SECS,
  96         CLUSTER_ATTR_LOG_DEBUG,
  97         CLUSTER_ATTR_LOG_INFO,
  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(log_info, 0);
 170 CLUSTER_ATTR(protocol, 0);
 171 CLUSTER_ATTR(timewarn_cs, 1);
 172 CLUSTER_ATTR(waitwarn_us, 0);
 173 CLUSTER_ATTR(new_rsb_count, 0);
 174 CLUSTER_ATTR(recover_callbacks, 0);
 175
 176 static struct configfs_attribute *cluster_attrs[] = {
 177         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 178         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 179         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 180         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 181         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 182         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 183         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 184         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 185         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 186         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 187         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
 188         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 189         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 190         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 191         NULL,
 192 };
 193
 194 enum {
 195         COMM_ATTR_NODEID = 0,
 196         COMM_ATTR_LOCAL,
 197         COMM_ATTR_ADDR,
 198         COMM_ATTR_ADDR_LIST,
 199 };
 200
 201 enum {
 202         NODE_ATTR_NODEID = 0,
 203         NODE_ATTR_WEIGHT,
 204 };
 205
 206 struct dlm_clusters {
 207         struct configfs_subsystem subsys;
 208 };
 209
 210 struct dlm_spaces {
 211         struct config_group ss_group;
 212 };
 213
 214 struct dlm_space {
 215         struct config_group group;
 216         struct list_head members;
 217         struct mutex members_lock;
 218         int members_count;
 219 };
 220
 221 struct dlm_comms {
 222         struct config_group cs_group;
 223 };
 224
 225 struct dlm_comm {
 226         struct config_item item;
 227         int seq;
 228         int nodeid;
 229         int local;
 230         int addr_count;
 231         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 232 };
 233
 234 struct dlm_nodes {
 235         struct config_group ns_group;
 236 };
 237
 238 struct dlm_node {
 239         struct config_item item;
 240         struct list_head list; /* space->members */
 241         int nodeid;
 242         int weight;
 243         int new;
 244         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 245 };
 246
 247 static struct configfs_group_operations clusters_ops = {
 248         .make_group = make_cluster,
 249         .drop_item = drop_cluster,
 250 };
 251
 252 static struct configfs_item_operations cluster_ops = {
 253         .release = release_cluster,
 254 };
 255
 256 static struct configfs_group_operations spaces_ops = {
 257         .make_group = make_space,
 258         .drop_item = drop_space,
 259 };
 260
 261 static struct configfs_item_operations space_ops = {
 262         .release = release_space,
 263 };
 264
 265 static struct configfs_group_operations comms_ops = {
 266         .make_item = make_comm,
 267         .drop_item = drop_comm,
 268 };
 269
 270 static struct configfs_item_operations comm_ops = {
 271         .release = release_comm,
 272 };
 273
 274 static struct configfs_group_operations nodes_ops = {
 275         .make_item = make_node,
 276         .drop_item = drop_node,
 277 };
 278
 279 static struct configfs_item_operations node_ops = {
 280         .release = release_node,
 281 };
 282
 283 static const struct config_item_type clusters_type = {
 284         .ct_group_ops = &clusters_ops,
 285         .ct_owner = THIS_MODULE,
 286 };
 287
 288 static const struct config_item_type cluster_type = {
 289         .ct_item_ops = &cluster_ops,
 290         .ct_attrs = cluster_attrs,
 291         .ct_owner = THIS_MODULE,
 292 };
 293
 294 static const struct config_item_type spaces_type = {
 295         .ct_group_ops = &spaces_ops,
 296         .ct_owner = THIS_MODULE,
 297 };
 298
 299 static const struct config_item_type space_type = {
 300         .ct_item_ops = &space_ops,
 301         .ct_owner = THIS_MODULE,
 302 };
 303
 304 static const struct config_item_type comms_type = {
 305         .ct_group_ops = &comms_ops,
 306         .ct_owner = THIS_MODULE,
 307 };
 308
 309 static const struct config_item_type comm_type = {
 310         .ct_item_ops = &comm_ops,
 311         .ct_attrs = comm_attrs,
 312         .ct_owner = THIS_MODULE,
 313 };
 314
 315 static const struct config_item_type nodes_type = {
 316         .ct_group_ops = &nodes_ops,
 317         .ct_owner = THIS_MODULE,
 318 };
 319
 320 static const struct config_item_type node_type = {
 321         .ct_item_ops = &node_ops,
 322         .ct_attrs = node_attrs,
 323         .ct_owner = THIS_MODULE,
 324 };
 325
 326 static struct dlm_space *config_item_to_space(struct config_item *i)
 327 {
 328         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 329                    NULL;
 330 }
 331
 332 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 333 {
 334         return i ? container_of(i, struct dlm_comm, item) : NULL;
 335 }
 336
 337 static struct dlm_node *config_item_to_node(struct config_item *i)
 338 {
 339         return i ? container_of(i, struct dlm_node, item) : NULL;
 340 }
 341
 342 static struct config_group *make_cluster(struct config_group *g,
 343                                          const char *name)
 344 {
 345         struct dlm_cluster *cl = NULL;
 346         struct dlm_spaces *sps = NULL;
 347         struct dlm_comms *cms = NULL;
 348
 349         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 350         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 351         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 352
 353         if (!cl || !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         configfs_add_default_group(&sps->ss_group, &cl->group);
 361         configfs_add_default_group(&cms->cs_group, &cl->group);
 362
 363         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 364         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 365         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 366         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 367         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 368         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 369         cl->cl_log_debug = dlm_config.ci_log_debug;
 370         cl->cl_log_info = dlm_config.ci_log_info;
 371         cl->cl_protocol = dlm_config.ci_protocol;
 372         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 373         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 374         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 375         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 376         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 377                DLM_LOCKSPACE_LEN);
 378
 379         space_list = &sps->ss_group;
 380         comm_list = &cms->cs_group;
 381         return &cl->group;
 382
 383  fail:
 384         kfree(cl);
 385         kfree(sps);
 386         kfree(cms);
 387         return ERR_PTR(-ENOMEM);
 388 }
 389
 390 static void drop_cluster(struct config_group *g, struct config_item *i)
 391 {
 392         struct dlm_cluster *cl = config_item_to_cluster(i);
 393
 394         configfs_remove_default_groups(&cl->group);
 395
 396         space_list = NULL;
 397         comm_list = NULL;
 398
 399         config_item_put(i);
 400 }
 401
 402 static void release_cluster(struct config_item *i)
 403 {
 404         struct dlm_cluster *cl = config_item_to_cluster(i);
 405         kfree(cl);
 406 }
 407
 408 static struct config_group *make_space(struct config_group *g, const char *name)
 409 {
 410         struct dlm_space *sp = NULL;
 411         struct dlm_nodes *nds = NULL;
 412
 413         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 414         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 415
 416         if (!sp || !nds)
 417                 goto fail;
 418
 419         config_group_init_type_name(&sp->group, name, &space_type);
 420
 421         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 422         configfs_add_default_group(&nds->ns_group, &sp->group);
 423
 424         INIT_LIST_HEAD(&sp->members);
 425         mutex_init(&sp->members_lock);
 426         sp->members_count = 0;
 427         return &sp->group;
 428
 429  fail:
 430         kfree(sp);
 431         kfree(nds);
 432         return ERR_PTR(-ENOMEM);
 433 }
 434
 435 static void drop_space(struct config_group *g, struct config_item *i)
 436 {
 437         struct dlm_space *sp = config_item_to_space(i);
 438
 439         /* assert list_empty(&sp->members) */
 440
 441         configfs_remove_default_groups(&sp->group);
 442         config_item_put(i);
 443 }
 444
 445 static void release_space(struct config_item *i)
 446 {
 447         struct dlm_space *sp = config_item_to_space(i);
 448         kfree(sp);
 449 }
 450
 451 static struct config_item *make_comm(struct config_group *g, const char *name)
 452 {
 453         struct dlm_comm *cm;
 454
 455         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 456         if (!cm)
 457                 return ERR_PTR(-ENOMEM);
 458
 459         config_item_init_type_name(&cm->item, name, &comm_type);
 460
 461         cm->seq = dlm_comm_count++;
 462         if (!cm->seq)
 463                 cm->seq = dlm_comm_count++;
 464
 465         cm->nodeid = -1;
 466         cm->local = 0;
 467         cm->addr_count = 0;
 468         return &cm->item;
 469 }
 470
 471 static void drop_comm(struct config_group *g, struct config_item *i)
 472 {
 473         struct dlm_comm *cm = config_item_to_comm(i);
 474         if (local_comm == cm)
 475                 local_comm = NULL;
 476         dlm_lowcomms_close(cm->nodeid);
 477         while (cm->addr_count--)
 478                 kfree(cm->addr[cm->addr_count]);
 479         config_item_put(i);
 480 }
 481
 482 static void release_comm(struct config_item *i)
 483 {
 484         struct dlm_comm *cm = config_item_to_comm(i);
 485         kfree(cm);
 486 }
 487
 488 static struct config_item *make_node(struct config_group *g, const char *name)
 489 {
 490         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 491         struct dlm_node *nd;
 492
 493         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 494         if (!nd)
 495                 return ERR_PTR(-ENOMEM);
 496
 497         config_item_init_type_name(&nd->item, name, &node_type);
 498         nd->nodeid = -1;
 499         nd->weight = 1;  /* default weight of 1 if none is set */
 500         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 501
 502         mutex_lock(&sp->members_lock);
 503         list_add(&nd->list, &sp->members);
 504         sp->members_count++;
 505         mutex_unlock(&sp->members_lock);
 506
 507         return &nd->item;
 508 }
 509
 510 static void drop_node(struct config_group *g, struct config_item *i)
 511 {
 512         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 513         struct dlm_node *nd = config_item_to_node(i);
 514
 515         mutex_lock(&sp->members_lock);
 516         list_del(&nd->list);
 517         sp->members_count--;
 518         mutex_unlock(&sp->members_lock);
 519
 520         config_item_put(i);
 521 }
 522
 523 static void release_node(struct config_item *i)
 524 {
 525         struct dlm_node *nd = config_item_to_node(i);
 526         kfree(nd);
 527 }
 528
 529 static struct dlm_clusters clusters_root = {
 530         .subsys = {
 531                 .su_group = {
 532                         .cg_item = {
 533                                 .ci_namebuf = "dlm",
 534                                 .ci_type = &clusters_type,
 535                         },
 536                 },
 537         },
 538 };
 539
 540 int __init dlm_config_init(void)
 541 {
 542         config_group_init(&clusters_root.subsys.su_group);
 543         mutex_init(&clusters_root.subsys.su_mutex);
 544         return configfs_register_subsystem(&clusters_root.subsys);
 545 }
 546
 547 void dlm_config_exit(void)
 548 {
 549         configfs_unregister_subsystem(&clusters_root.subsys);
 550 }
 551
 552 /*
 553  * Functions for user space to read/write attributes
 554  */
 555
 556 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 557 {
 558         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 559 }
 560
 561 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 562                                  size_t len)
 563 {
 564         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 565
 566         if (rc)
 567                 return rc;
 568         return len;
 569 }
 570
 571 static ssize_t comm_local_show(struct config_item *item, char *buf)
 572 {
 573         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 574 }
 575
 576 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 577                                 size_t len)
 578 {
 579         struct dlm_comm *cm = config_item_to_comm(item);
 580         int rc = kstrtoint(buf, 0, &cm->local);
 581
 582         if (rc)
 583                 return rc;
 584         if (cm->local && !local_comm)
 585                 local_comm = cm;
 586         return len;
 587 }
 588
 589 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 590                 size_t len)
 591 {
 592         struct dlm_comm *cm = config_item_to_comm(item);
 593         struct sockaddr_storage *addr;
 594         int rv;
 595
 596         if (len != sizeof(struct sockaddr_storage))
 597                 return -EINVAL;
 598
 599         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 600                 return -ENOSPC;
 601
 602         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 603         if (!addr)
 604                 return -ENOMEM;
 605
 606         memcpy(addr, buf, len);
 607
 608         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 609         if (rv) {
 610                 kfree(addr);
 611                 return rv;
 612         }
 613
 614         cm->addr[cm->addr_count++] = addr;
 615         return len;
 616 }
 617
 618 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 619 {
 620         struct dlm_comm *cm = config_item_to_comm(item);
 621         ssize_t s;
 622         ssize_t allowance;
 623         int i;
 624         struct sockaddr_storage *addr;
 625         struct sockaddr_in *addr_in;
 626         struct sockaddr_in6 *addr_in6;
 627
 628         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 629         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 630
 631
 632         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 633         allowance = 4096;
 634         buf[0] = '\0';
 635
 636         for (i = 0; i < cm->addr_count; i++) {
 637                 addr = cm->addr[i];
 638
 639                 switch(addr->ss_family) {
 640                 case AF_INET:
 641                         addr_in = (struct sockaddr_in *)addr;
 642                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 643                         break;
 644                 case AF_INET6:
 645                         addr_in6 = (struct sockaddr_in6 *)addr;
 646                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 647                         break;
 648                 default:
 649                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 650                         break;
 651                 }
 652                 allowance -= s;
 653                 if (allowance >= 0)
 654                         strcat(buf, buf0);
 655                 else {
 656                         allowance += s;
 657                         break;
 658                 }
 659         }
 660         return 4096 - allowance;
 661 }
 662
 663 CONFIGFS_ATTR(comm_, nodeid);
 664 CONFIGFS_ATTR(comm_, local);
 665 CONFIGFS_ATTR_WO(comm_, addr);
 666 CONFIGFS_ATTR_RO(comm_, addr_list);
 667
 668 static struct configfs_attribute *comm_attrs[] = {
 669         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 670         [COMM_ATTR_LOCAL] = &comm_attr_local,
 671         [COMM_ATTR_ADDR] = &comm_attr_addr,
 672         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 673         NULL,
 674 };
 675
 676 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 677 {
 678         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 679 }
 680
 681 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 682                                  size_t len)
 683 {
 684         struct dlm_node *nd = config_item_to_node(item);
 685         uint32_t seq = 0;
 686         int rc = kstrtoint(buf, 0, &nd->nodeid);
 687
 688         if (rc)
 689                 return rc;
 690         dlm_comm_seq(nd->nodeid, &seq);
 691         nd->comm_seq = seq;
 692         return len;
 693 }
 694
 695 static ssize_t node_weight_show(struct config_item *item, char *buf)
 696 {
 697         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 698 }
 699
 700 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 701                                  size_t len)
 702 {
 703         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 704
 705         if (rc)
 706                 return rc;
 707         return len;
 708 }
 709
 710 CONFIGFS_ATTR(node_, nodeid);
 711 CONFIGFS_ATTR(node_, weight);
 712
 713 static struct configfs_attribute *node_attrs[] = {
 714         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 715         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 716         NULL,
 717 };
 718
 719 /*
 720  * Functions for the dlm to get the info that's been configured
 721  */
 722
 723 static struct dlm_space *get_space(char *name)
 724 {
 725         struct config_item *i;
 726
 727         if (!space_list)
 728                 return NULL;
 729
 730         mutex_lock(&space_list->cg_subsys->su_mutex);
 731         i = config_group_find_item(space_list, name);
 732         mutex_unlock(&space_list->cg_subsys->su_mutex);
 733
 734         return config_item_to_space(i);
 735 }
 736
 737 static void put_space(struct dlm_space *sp)
 738 {
 739         config_item_put(&sp->group.cg_item);
 740 }
 741
 742 static struct dlm_comm *get_comm(int nodeid)
 743 {
 744         struct config_item *i;
 745         struct dlm_comm *cm = NULL;
 746         int found = 0;
 747
 748         if (!comm_list)
 749                 return NULL;
 750
 751         mutex_lock(&clusters_root.subsys.su_mutex);
 752
 753         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 754                 cm = config_item_to_comm(i);
 755
 756                 if (cm->nodeid != nodeid)
 757                         continue;
 758                 found = 1;
 759                 config_item_get(i);
 760                 break;
 761         }
 762         mutex_unlock(&clusters_root.subsys.su_mutex);
 763
 764         if (!found)
 765                 cm = NULL;
 766         return cm;
 767 }
 768
 769 static void put_comm(struct dlm_comm *cm)
 770 {
 771         config_item_put(&cm->item);
 772 }
 773
 774 /* caller must free mem */
 775 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 776                      int *count_out)
 777 {
 778         struct dlm_space *sp;
 779         struct dlm_node *nd;
 780         struct dlm_config_node *nodes, *node;
 781         int rv, count;
 782
 783         sp = get_space(lsname);
 784         if (!sp)
 785                 return -EEXIST;
 786
 787         mutex_lock(&sp->members_lock);
 788         if (!sp->members_count) {
 789                 rv = -EINVAL;
 790                 printk(KERN_ERR "dlm: zero members_count\n");
 791                 goto out;
 792         }
 793
 794         count = sp->members_count;
 795
 796         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 797         if (!nodes) {
 798                 rv = -ENOMEM;
 799                 goto out;
 800         }
 801
 802         node = nodes;
 803         list_for_each_entry(nd, &sp->members, list) {
 804                 node->nodeid = nd->nodeid;
 805                 node->weight = nd->weight;
 806                 node->new = nd->new;
 807                 node->comm_seq = nd->comm_seq;
 808                 node++;
 809
 810                 nd->new = 0;
 811         }
 812
 813         *count_out = count;
 814         *nodes_out = nodes;
 815         rv = 0;
 816  out:
 817         mutex_unlock(&sp->members_lock);
 818         put_space(sp);
 819         return rv;
 820 }
 821
 822 int dlm_comm_seq(int nodeid, uint32_t *seq)
 823 {
 824         struct dlm_comm *cm = get_comm(nodeid);
 825         if (!cm)
 826                 return -EEXIST;
 827         *seq = cm->seq;
 828         put_comm(cm);
 829         return 0;
 830 }
 831
 832 int dlm_our_nodeid(void)
 833 {
 834         return local_comm ? local_comm->nodeid : 0;
 835 }
 836
 837 /* num 0 is first addr, num 1 is second addr */
 838 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 839 {
 840         if (!local_comm)
 841                 return -1;
 842         if (num + 1 > local_comm->addr_count)
 843                 return -1;
 844         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 845         return 0;
 846 }
 847
 848 /* Config file defaults */
 849 #define DEFAULT_TCP_PORT       21064
 850 #define DEFAULT_BUFFER_SIZE     4096
 851 #define DEFAULT_RSBTBL_SIZE     1024
 852 #define DEFAULT_RECOVER_TIMER      5
 853 #define DEFAULT_TOSS_SECS         10
 854 #define DEFAULT_SCAN_SECS          5
 855 #define DEFAULT_LOG_DEBUG          0
 856 #define DEFAULT_LOG_INFO           1
 857 #define DEFAULT_PROTOCOL           0
 858 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 859 #define DEFAULT_WAITWARN_US        0
 860 #define DEFAULT_NEW_RSB_COUNT    128
 861 #define DEFAULT_RECOVER_CALLBACKS  0
 862 #define DEFAULT_CLUSTER_NAME      ""
 863
 864 struct dlm_config_info dlm_config = {
 865         .ci_tcp_port = DEFAULT_TCP_PORT,
 866         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 867         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 868         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 869         .ci_toss_secs = DEFAULT_TOSS_SECS,
 870         .ci_scan_secs = DEFAULT_SCAN_SECS,
 871         .ci_log_debug = DEFAULT_LOG_DEBUG,
 872         .ci_log_info = DEFAULT_LOG_INFO,
 873         .ci_protocol = DEFAULT_PROTOCOL,
 874         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 875         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 876         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 877         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 878         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 879 };
 880