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_mark;
  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_LOG_INFO,
  99         CLUSTER_ATTR_PROTOCOL,
 100         CLUSTER_ATTR_MARK,
 101         CLUSTER_ATTR_TIMEWARN_CS,
 102         CLUSTER_ATTR_WAITWARN_US,
 103         CLUSTER_ATTR_NEW_RSB_COUNT,
 104         CLUSTER_ATTR_RECOVER_CALLBACKS,
 105         CLUSTER_ATTR_CLUSTER_NAME,
 106 };
 107
 108 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
 109 {
 110         struct dlm_cluster *cl = config_item_to_cluster(item);
 111         return sprintf(buf, "%s\n", cl->cl_cluster_name);
 112 }
 113
 114 static ssize_t cluster_cluster_name_store(struct config_item *item,
 115                                           const char *buf, size_t len)
 116 {
 117         struct dlm_cluster *cl = config_item_to_cluster(item);
 118
 119         strlcpy(dlm_config.ci_cluster_name, buf,
 120                                 sizeof(dlm_config.ci_cluster_name));
 121         strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
 122         return len;
 123 }
 124
 125 CONFIGFS_ATTR(cluster_, cluster_name);
 126
 127 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 128                            int *info_field, bool (*check_cb)(unsigned int x),
 129                            const char *buf, size_t len)
 130 {
 131         unsigned int x;
 132         int rc;
 133
 134         if (!capable(CAP_SYS_ADMIN))
 135                 return -EPERM;
 136         rc = kstrtouint(buf, 0, &x);
 137         if (rc)
 138                 return rc;
 139
 140         if (check_cb && check_cb(x))
 141                 return -EINVAL;
 142
 143         *cl_field = x;
 144         *info_field = x;
 145
 146         return len;
 147 }
 148
 149 #define CLUSTER_ATTR(name, check_cb)                                          \
 150 static ssize_t cluster_##name##_store(struct config_item *item, \
 151                 const char *buf, size_t len) \
 152 {                                                                             \
 153         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 154         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 155                            check_cb, buf, len);                               \
 156 }                                                                             \
 157 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 158 {                                                                             \
 159         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 160         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 161 }                                                                             \
 162 CONFIGFS_ATTR(cluster_, name);
 163
 164 static bool dlm_check_zero(unsigned int x)
 165 {
 166         return !x;
 167 }
 168
 169 static bool dlm_check_buffer_size(unsigned int x)
 170 {
 171         return (x < DEFAULT_BUFFER_SIZE);
 172 }
 173
 174 CLUSTER_ATTR(tcp_port, dlm_check_zero);
 175 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
 176 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
 177 CLUSTER_ATTR(recover_timer, dlm_check_zero);
 178 CLUSTER_ATTR(toss_secs, dlm_check_zero);
 179 CLUSTER_ATTR(scan_secs, dlm_check_zero);
 180 CLUSTER_ATTR(log_debug, NULL);
 181 CLUSTER_ATTR(log_info, NULL);
 182 CLUSTER_ATTR(protocol, NULL);
 183 CLUSTER_ATTR(mark, NULL);
 184 CLUSTER_ATTR(timewarn_cs, dlm_check_zero);
 185 CLUSTER_ATTR(waitwarn_us, NULL);
 186 CLUSTER_ATTR(new_rsb_count, NULL);
 187 CLUSTER_ATTR(recover_callbacks, NULL);
 188
 189 static struct configfs_attribute *cluster_attrs[] = {
 190         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 191         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 192         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 193         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 194         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 195         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 196         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 197         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 198         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 199         [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
 200         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 201         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
 202         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 203         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 204         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 205         NULL,
 206 };
 207
 208 enum {
 209         COMM_ATTR_NODEID = 0,
 210         COMM_ATTR_LOCAL,
 211         COMM_ATTR_ADDR,
 212         COMM_ATTR_ADDR_LIST,
 213         COMM_ATTR_MARK,
 214 };
 215
 216 enum {
 217         NODE_ATTR_NODEID = 0,
 218         NODE_ATTR_WEIGHT,
 219 };
 220
 221 struct dlm_clusters {
 222         struct configfs_subsystem subsys;
 223 };
 224
 225 struct dlm_spaces {
 226         struct config_group ss_group;
 227 };
 228
 229 struct dlm_space {
 230         struct config_group group;
 231         struct list_head members;
 232         struct mutex members_lock;
 233         int members_count;
 234         struct dlm_nodes *nds;
 235 };
 236
 237 struct dlm_comms {
 238         struct config_group cs_group;
 239 };
 240
 241 struct dlm_comm {
 242         struct config_item item;
 243         int seq;
 244         int nodeid;
 245         int local;
 246         int addr_count;
 247         unsigned int mark;
 248         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 249 };
 250
 251 struct dlm_nodes {
 252         struct config_group ns_group;
 253 };
 254
 255 struct dlm_node {
 256         struct config_item item;
 257         struct list_head list; /* space->members */
 258         int nodeid;
 259         int weight;
 260         int new;
 261         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 262 };
 263
 264 static struct configfs_group_operations clusters_ops = {
 265         .make_group = make_cluster,
 266         .drop_item = drop_cluster,
 267 };
 268
 269 static struct configfs_item_operations cluster_ops = {
 270         .release = release_cluster,
 271 };
 272
 273 static struct configfs_group_operations spaces_ops = {
 274         .make_group = make_space,
 275         .drop_item = drop_space,
 276 };
 277
 278 static struct configfs_item_operations space_ops = {
 279         .release = release_space,
 280 };
 281
 282 static struct configfs_group_operations comms_ops = {
 283         .make_item = make_comm,
 284         .drop_item = drop_comm,
 285 };
 286
 287 static struct configfs_item_operations comm_ops = {
 288         .release = release_comm,
 289 };
 290
 291 static struct configfs_group_operations nodes_ops = {
 292         .make_item = make_node,
 293         .drop_item = drop_node,
 294 };
 295
 296 static struct configfs_item_operations node_ops = {
 297         .release = release_node,
 298 };
 299
 300 static const struct config_item_type clusters_type = {
 301         .ct_group_ops = &clusters_ops,
 302         .ct_owner = THIS_MODULE,
 303 };
 304
 305 static const struct config_item_type cluster_type = {
 306         .ct_item_ops = &cluster_ops,
 307         .ct_attrs = cluster_attrs,
 308         .ct_owner = THIS_MODULE,
 309 };
 310
 311 static const struct config_item_type spaces_type = {
 312         .ct_group_ops = &spaces_ops,
 313         .ct_owner = THIS_MODULE,
 314 };
 315
 316 static const struct config_item_type space_type = {
 317         .ct_item_ops = &space_ops,
 318         .ct_owner = THIS_MODULE,
 319 };
 320
 321 static const struct config_item_type comms_type = {
 322         .ct_group_ops = &comms_ops,
 323         .ct_owner = THIS_MODULE,
 324 };
 325
 326 static const struct config_item_type comm_type = {
 327         .ct_item_ops = &comm_ops,
 328         .ct_attrs = comm_attrs,
 329         .ct_owner = THIS_MODULE,
 330 };
 331
 332 static const struct config_item_type nodes_type = {
 333         .ct_group_ops = &nodes_ops,
 334         .ct_owner = THIS_MODULE,
 335 };
 336
 337 static const struct config_item_type node_type = {
 338         .ct_item_ops = &node_ops,
 339         .ct_attrs = node_attrs,
 340         .ct_owner = THIS_MODULE,
 341 };
 342
 343 static struct dlm_space *config_item_to_space(struct config_item *i)
 344 {
 345         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 346                    NULL;
 347 }
 348
 349 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 350 {
 351         return i ? container_of(i, struct dlm_comm, item) : NULL;
 352 }
 353
 354 static struct dlm_node *config_item_to_node(struct config_item *i)
 355 {
 356         return i ? container_of(i, struct dlm_node, item) : NULL;
 357 }
 358
 359 static struct config_group *make_cluster(struct config_group *g,
 360                                          const char *name)
 361 {
 362         struct dlm_cluster *cl = NULL;
 363         struct dlm_spaces *sps = NULL;
 364         struct dlm_comms *cms = NULL;
 365
 366         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 367         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 368         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 369
 370         if (!cl || !sps || !cms)
 371                 goto fail;
 372
 373         config_group_init_type_name(&cl->group, name, &cluster_type);
 374         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 375         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 376
 377         configfs_add_default_group(&sps->ss_group, &cl->group);
 378         configfs_add_default_group(&cms->cs_group, &cl->group);
 379
 380         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 381         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 382         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 383         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 384         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 385         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 386         cl->cl_log_debug = dlm_config.ci_log_debug;
 387         cl->cl_log_info = dlm_config.ci_log_info;
 388         cl->cl_protocol = dlm_config.ci_protocol;
 389         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 390         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 391         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 392         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 393         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 394                DLM_LOCKSPACE_LEN);
 395
 396         space_list = &sps->ss_group;
 397         comm_list = &cms->cs_group;
 398         return &cl->group;
 399
 400  fail:
 401         kfree(cl);
 402         kfree(sps);
 403         kfree(cms);
 404         return ERR_PTR(-ENOMEM);
 405 }
 406
 407 static void drop_cluster(struct config_group *g, struct config_item *i)
 408 {
 409         struct dlm_cluster *cl = config_item_to_cluster(i);
 410
 411         configfs_remove_default_groups(&cl->group);
 412
 413         space_list = NULL;
 414         comm_list = NULL;
 415
 416         config_item_put(i);
 417 }
 418
 419 static void release_cluster(struct config_item *i)
 420 {
 421         struct dlm_cluster *cl = config_item_to_cluster(i);
 422         kfree(cl);
 423 }
 424
 425 static struct config_group *make_space(struct config_group *g, const char *name)
 426 {
 427         struct dlm_space *sp = NULL;
 428         struct dlm_nodes *nds = NULL;
 429
 430         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 431         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 432
 433         if (!sp || !nds)
 434                 goto fail;
 435
 436         config_group_init_type_name(&sp->group, name, &space_type);
 437
 438         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 439         configfs_add_default_group(&nds->ns_group, &sp->group);
 440
 441         INIT_LIST_HEAD(&sp->members);
 442         mutex_init(&sp->members_lock);
 443         sp->members_count = 0;
 444         sp->nds = nds;
 445         return &sp->group;
 446
 447  fail:
 448         kfree(sp);
 449         kfree(nds);
 450         return ERR_PTR(-ENOMEM);
 451 }
 452
 453 static void drop_space(struct config_group *g, struct config_item *i)
 454 {
 455         struct dlm_space *sp = config_item_to_space(i);
 456
 457         /* assert list_empty(&sp->members) */
 458
 459         configfs_remove_default_groups(&sp->group);
 460         config_item_put(i);
 461 }
 462
 463 static void release_space(struct config_item *i)
 464 {
 465         struct dlm_space *sp = config_item_to_space(i);
 466         kfree(sp->nds);
 467         kfree(sp);
 468 }
 469
 470 static struct config_item *make_comm(struct config_group *g, const char *name)
 471 {
 472         struct dlm_comm *cm;
 473
 474         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 475         if (!cm)
 476                 return ERR_PTR(-ENOMEM);
 477
 478         config_item_init_type_name(&cm->item, name, &comm_type);
 479
 480         cm->seq = dlm_comm_count++;
 481         if (!cm->seq)
 482                 cm->seq = dlm_comm_count++;
 483
 484         cm->nodeid = -1;
 485         cm->local = 0;
 486         cm->addr_count = 0;
 487         cm->mark = 0;
 488         return &cm->item;
 489 }
 490
 491 static void drop_comm(struct config_group *g, struct config_item *i)
 492 {
 493         struct dlm_comm *cm = config_item_to_comm(i);
 494         if (local_comm == cm)
 495                 local_comm = NULL;
 496         dlm_lowcomms_close(cm->nodeid);
 497         while (cm->addr_count--)
 498                 kfree(cm->addr[cm->addr_count]);
 499         config_item_put(i);
 500 }
 501
 502 static void release_comm(struct config_item *i)
 503 {
 504         struct dlm_comm *cm = config_item_to_comm(i);
 505         kfree(cm);
 506 }
 507
 508 static struct config_item *make_node(struct config_group *g, const char *name)
 509 {
 510         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 511         struct dlm_node *nd;
 512
 513         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 514         if (!nd)
 515                 return ERR_PTR(-ENOMEM);
 516
 517         config_item_init_type_name(&nd->item, name, &node_type);
 518         nd->nodeid = -1;
 519         nd->weight = 1;  /* default weight of 1 if none is set */
 520         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 521
 522         mutex_lock(&sp->members_lock);
 523         list_add(&nd->list, &sp->members);
 524         sp->members_count++;
 525         mutex_unlock(&sp->members_lock);
 526
 527         return &nd->item;
 528 }
 529
 530 static void drop_node(struct config_group *g, struct config_item *i)
 531 {
 532         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 533         struct dlm_node *nd = config_item_to_node(i);
 534
 535         mutex_lock(&sp->members_lock);
 536         list_del(&nd->list);
 537         sp->members_count--;
 538         mutex_unlock(&sp->members_lock);
 539
 540         config_item_put(i);
 541 }
 542
 543 static void release_node(struct config_item *i)
 544 {
 545         struct dlm_node *nd = config_item_to_node(i);
 546         kfree(nd);
 547 }
 548
 549 static struct dlm_clusters clusters_root = {
 550         .subsys = {
 551                 .su_group = {
 552                         .cg_item = {
 553                                 .ci_namebuf = "dlm",
 554                                 .ci_type = &clusters_type,
 555                         },
 556                 },
 557         },
 558 };
 559
 560 int __init dlm_config_init(void)
 561 {
 562         config_group_init(&clusters_root.subsys.su_group);
 563         mutex_init(&clusters_root.subsys.su_mutex);
 564         return configfs_register_subsystem(&clusters_root.subsys);
 565 }
 566
 567 void dlm_config_exit(void)
 568 {
 569         configfs_unregister_subsystem(&clusters_root.subsys);
 570 }
 571
 572 /*
 573  * Functions for user space to read/write attributes
 574  */
 575
 576 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 577 {
 578         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 579 }
 580
 581 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 582                                  size_t len)
 583 {
 584         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 585
 586         if (rc)
 587                 return rc;
 588         return len;
 589 }
 590
 591 static ssize_t comm_local_show(struct config_item *item, char *buf)
 592 {
 593         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 594 }
 595
 596 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 597                                 size_t len)
 598 {
 599         struct dlm_comm *cm = config_item_to_comm(item);
 600         int rc = kstrtoint(buf, 0, &cm->local);
 601
 602         if (rc)
 603                 return rc;
 604         if (cm->local && !local_comm)
 605                 local_comm = cm;
 606         return len;
 607 }
 608
 609 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 610                 size_t len)
 611 {
 612         struct dlm_comm *cm = config_item_to_comm(item);
 613         struct sockaddr_storage *addr;
 614         int rv;
 615
 616         if (len != sizeof(struct sockaddr_storage))
 617                 return -EINVAL;
 618
 619         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 620                 return -ENOSPC;
 621
 622         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 623         if (!addr)
 624                 return -ENOMEM;
 625
 626         memcpy(addr, buf, len);
 627
 628         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 629         if (rv) {
 630                 kfree(addr);
 631                 return rv;
 632         }
 633
 634         cm->addr[cm->addr_count++] = addr;
 635         return len;
 636 }
 637
 638 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 639 {
 640         struct dlm_comm *cm = config_item_to_comm(item);
 641         ssize_t s;
 642         ssize_t allowance;
 643         int i;
 644         struct sockaddr_storage *addr;
 645         struct sockaddr_in *addr_in;
 646         struct sockaddr_in6 *addr_in6;
 647
 648         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 649         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 650
 651
 652         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 653         allowance = 4096;
 654         buf[0] = '\0';
 655
 656         for (i = 0; i < cm->addr_count; i++) {
 657                 addr = cm->addr[i];
 658
 659                 switch(addr->ss_family) {
 660                 case AF_INET:
 661                         addr_in = (struct sockaddr_in *)addr;
 662                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 663                         break;
 664                 case AF_INET6:
 665                         addr_in6 = (struct sockaddr_in6 *)addr;
 666                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 667                         break;
 668                 default:
 669                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 670                         break;
 671                 }
 672                 allowance -= s;
 673                 if (allowance >= 0)
 674                         strcat(buf, buf0);
 675                 else {
 676                         allowance += s;
 677                         break;
 678                 }
 679         }
 680         return 4096 - allowance;
 681 }
 682
 683 static ssize_t comm_mark_show(struct config_item *item, char *buf)
 684 {
 685         return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
 686 }
 687
 688 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
 689                                size_t len)
 690 {
 691         unsigned int mark;
 692         int rc;
 693
 694         rc = kstrtouint(buf, 0, &mark);
 695         if (rc)
 696                 return rc;
 697
 698         config_item_to_comm(item)->mark = mark;
 699         return len;
 700 }
 701
 702 CONFIGFS_ATTR(comm_, nodeid);
 703 CONFIGFS_ATTR(comm_, local);
 704 CONFIGFS_ATTR(comm_, mark);
 705 CONFIGFS_ATTR_WO(comm_, addr);
 706 CONFIGFS_ATTR_RO(comm_, addr_list);
 707
 708 static struct configfs_attribute *comm_attrs[] = {
 709         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 710         [COMM_ATTR_LOCAL] = &comm_attr_local,
 711         [COMM_ATTR_ADDR] = &comm_attr_addr,
 712         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 713         [COMM_ATTR_MARK] = &comm_attr_mark,
 714         NULL,
 715 };
 716
 717 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 718 {
 719         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 720 }
 721
 722 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 723                                  size_t len)
 724 {
 725         struct dlm_node *nd = config_item_to_node(item);
 726         uint32_t seq = 0;
 727         int rc = kstrtoint(buf, 0, &nd->nodeid);
 728
 729         if (rc)
 730                 return rc;
 731         dlm_comm_seq(nd->nodeid, &seq);
 732         nd->comm_seq = seq;
 733         return len;
 734 }
 735
 736 static ssize_t node_weight_show(struct config_item *item, char *buf)
 737 {
 738         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 739 }
 740
 741 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 742                                  size_t len)
 743 {
 744         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 745
 746         if (rc)
 747                 return rc;
 748         return len;
 749 }
 750
 751 CONFIGFS_ATTR(node_, nodeid);
 752 CONFIGFS_ATTR(node_, weight);
 753
 754 static struct configfs_attribute *node_attrs[] = {
 755         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 756         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 757         NULL,
 758 };
 759
 760 /*
 761  * Functions for the dlm to get the info that's been configured
 762  */
 763
 764 static struct dlm_space *get_space(char *name)
 765 {
 766         struct config_item *i;
 767
 768         if (!space_list)
 769                 return NULL;
 770
 771         mutex_lock(&space_list->cg_subsys->su_mutex);
 772         i = config_group_find_item(space_list, name);
 773         mutex_unlock(&space_list->cg_subsys->su_mutex);
 774
 775         return config_item_to_space(i);
 776 }
 777
 778 static void put_space(struct dlm_space *sp)
 779 {
 780         config_item_put(&sp->group.cg_item);
 781 }
 782
 783 static struct dlm_comm *get_comm(int nodeid)
 784 {
 785         struct config_item *i;
 786         struct dlm_comm *cm = NULL;
 787         int found = 0;
 788
 789         if (!comm_list)
 790                 return NULL;
 791
 792         mutex_lock(&clusters_root.subsys.su_mutex);
 793
 794         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 795                 cm = config_item_to_comm(i);
 796
 797                 if (cm->nodeid != nodeid)
 798                         continue;
 799                 found = 1;
 800                 config_item_get(i);
 801                 break;
 802         }
 803         mutex_unlock(&clusters_root.subsys.su_mutex);
 804
 805         if (!found)
 806                 cm = NULL;
 807         return cm;
 808 }
 809
 810 static void put_comm(struct dlm_comm *cm)
 811 {
 812         config_item_put(&cm->item);
 813 }
 814
 815 /* caller must free mem */
 816 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 817                      int *count_out)
 818 {
 819         struct dlm_space *sp;
 820         struct dlm_node *nd;
 821         struct dlm_config_node *nodes, *node;
 822         int rv, count;
 823
 824         sp = get_space(lsname);
 825         if (!sp)
 826                 return -EEXIST;
 827
 828         mutex_lock(&sp->members_lock);
 829         if (!sp->members_count) {
 830                 rv = -EINVAL;
 831                 printk(KERN_ERR "dlm: zero members_count\n");
 832                 goto out;
 833         }
 834
 835         count = sp->members_count;
 836
 837         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 838         if (!nodes) {
 839                 rv = -ENOMEM;
 840                 goto out;
 841         }
 842
 843         node = nodes;
 844         list_for_each_entry(nd, &sp->members, list) {
 845                 node->nodeid = nd->nodeid;
 846                 node->weight = nd->weight;
 847                 node->new = nd->new;
 848                 node->comm_seq = nd->comm_seq;
 849                 node++;
 850
 851                 nd->new = 0;
 852         }
 853
 854         *count_out = count;
 855         *nodes_out = nodes;
 856         rv = 0;
 857  out:
 858         mutex_unlock(&sp->members_lock);
 859         put_space(sp);
 860         return rv;
 861 }
 862
 863 int dlm_comm_seq(int nodeid, uint32_t *seq)
 864 {
 865         struct dlm_comm *cm = get_comm(nodeid);
 866         if (!cm)
 867                 return -EEXIST;
 868         *seq = cm->seq;
 869         put_comm(cm);
 870         return 0;
 871 }
 872
 873 void dlm_comm_mark(int nodeid, unsigned int *mark)
 874 {
 875         struct dlm_comm *cm;
 876
 877         cm = get_comm(nodeid);
 878         if (!cm) {
 879                 *mark = dlm_config.ci_mark;
 880                 return;
 881         }
 882
 883         if (cm->mark)
 884                 *mark = cm->mark;
 885         else
 886                 *mark = dlm_config.ci_mark;
 887
 888         put_comm(cm);
 889 }
 890
 891 int dlm_our_nodeid(void)
 892 {
 893         return local_comm ? local_comm->nodeid : 0;
 894 }
 895
 896 /* num 0 is first addr, num 1 is second addr */
 897 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 898 {
 899         if (!local_comm)
 900                 return -1;
 901         if (num + 1 > local_comm->addr_count)
 902                 return -1;
 903         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 904         return 0;
 905 }
 906
 907 /* Config file defaults */
 908 #define DEFAULT_TCP_PORT       21064
 909 #define DEFAULT_RSBTBL_SIZE     1024
 910 #define DEFAULT_RECOVER_TIMER      5
 911 #define DEFAULT_TOSS_SECS         10
 912 #define DEFAULT_SCAN_SECS          5
 913 #define DEFAULT_LOG_DEBUG          0
 914 #define DEFAULT_LOG_INFO           1
 915 #define DEFAULT_PROTOCOL           0
 916 #define DEFAULT_MARK               0
 917 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 918 #define DEFAULT_WAITWARN_US        0
 919 #define DEFAULT_NEW_RSB_COUNT    128
 920 #define DEFAULT_RECOVER_CALLBACKS  0
 921 #define DEFAULT_CLUSTER_NAME      ""
 922
 923 struct dlm_config_info dlm_config = {
 924         .ci_tcp_port = DEFAULT_TCP_PORT,
 925         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 926         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 927         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 928         .ci_toss_secs = DEFAULT_TOSS_SECS,
 929         .ci_scan_secs = DEFAULT_SCAN_SECS,
 930         .ci_log_debug = DEFAULT_LOG_DEBUG,
 931         .ci_log_info = DEFAULT_LOG_INFO,
 932         .ci_protocol = DEFAULT_PROTOCOL,
 933         .ci_mark = DEFAULT_MARK,
 934         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 935         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 936         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 937         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 938         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 939 };
 940