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 ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
  65                             char *buf);
  66 static ssize_t store_cluster(struct config_item *i,
  67                              struct configfs_attribute *a,
  68                              const char *buf, size_t len);
  69 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
  70                          char *buf);
  71 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
  72                           const char *buf, size_t len);
  73 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
  74                          char *buf);
  75 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
  76                           const char *buf, size_t len);
  77
  78 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
  79 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
  80                                 size_t len);
  81 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
  82 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
  83                                 size_t len);
  84 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
  85                                 size_t len);
  86 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
  87 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
  88 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
  89                                 size_t len);
  90 static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
  91 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
  92                                 size_t len);
  93
  94 struct dlm_cluster {
  95         struct config_group group;
  96         unsigned int cl_tcp_port;
  97         unsigned int cl_buffer_size;
  98         unsigned int cl_rsbtbl_size;
  99         unsigned int cl_recover_timer;
 100         unsigned int cl_toss_secs;
 101         unsigned int cl_scan_secs;
 102         unsigned int cl_log_debug;
 103         unsigned int cl_protocol;
 104         unsigned int cl_timewarn_cs;
 105         unsigned int cl_waitwarn_us;
 106         unsigned int cl_new_rsb_count;
 107         unsigned int cl_recover_callbacks;
 108         char cl_cluster_name[DLM_LOCKSPACE_LEN];
 109 };
 110
 111 enum {
 112         CLUSTER_ATTR_TCP_PORT = 0,
 113         CLUSTER_ATTR_BUFFER_SIZE,
 114         CLUSTER_ATTR_RSBTBL_SIZE,
 115         CLUSTER_ATTR_RECOVER_TIMER,
 116         CLUSTER_ATTR_TOSS_SECS,
 117         CLUSTER_ATTR_SCAN_SECS,
 118         CLUSTER_ATTR_LOG_DEBUG,
 119         CLUSTER_ATTR_PROTOCOL,
 120         CLUSTER_ATTR_TIMEWARN_CS,
 121         CLUSTER_ATTR_WAITWARN_US,
 122         CLUSTER_ATTR_NEW_RSB_COUNT,
 123         CLUSTER_ATTR_RECOVER_CALLBACKS,
 124         CLUSTER_ATTR_CLUSTER_NAME,
 125 };
 126
 127 struct cluster_attribute {
 128         struct configfs_attribute attr;
 129         ssize_t (*show)(struct dlm_cluster *, char *);
 130         ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
 131 };
 132
 133 static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf)
 134 {
 135         return sprintf(buf, "%s\n", cl->cl_cluster_name);
 136 }
 137
 138 static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl,
 139                                           const char *buf, size_t len)
 140 {
 141         strlcpy(dlm_config.ci_cluster_name, buf,
 142                                 sizeof(dlm_config.ci_cluster_name));
 143         strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
 144         return len;
 145 }
 146
 147 static struct cluster_attribute cluster_attr_cluster_name = {
 148         .attr   = { .ca_owner = THIS_MODULE,
 149                     .ca_name = "cluster_name",
 150                     .ca_mode = S_IRUGO | S_IWUSR },
 151         .show   = cluster_cluster_name_read,
 152         .store  = cluster_cluster_name_write,
 153 };
 154
 155 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 156                            int *info_field, int check_zero,
 157                            const char *buf, size_t len)
 158 {
 159         unsigned int x;
 160         int rc;
 161
 162         if (!capable(CAP_SYS_ADMIN))
 163                 return -EPERM;
 164         rc = kstrtouint(buf, 0, &x);
 165         if (rc)
 166                 return rc;
 167
 168         if (check_zero && !x)
 169                 return -EINVAL;
 170
 171         *cl_field = x;
 172         *info_field = x;
 173
 174         return len;
 175 }
 176
 177 #define CLUSTER_ATTR(name, check_zero)                                        \
 178 static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
 179 {                                                                             \
 180         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 181                            check_zero, buf, len);                             \
 182 }                                                                             \
 183 static ssize_t name##_read(struct dlm_cluster *cl, char *buf)                 \
 184 {                                                                             \
 185         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 186 }                                                                             \
 187 static struct cluster_attribute cluster_attr_##name =                         \
 188 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
 189
 190 CLUSTER_ATTR(tcp_port, 1);
 191 CLUSTER_ATTR(buffer_size, 1);
 192 CLUSTER_ATTR(rsbtbl_size, 1);
 193 CLUSTER_ATTR(recover_timer, 1);
 194 CLUSTER_ATTR(toss_secs, 1);
 195 CLUSTER_ATTR(scan_secs, 1);
 196 CLUSTER_ATTR(log_debug, 0);
 197 CLUSTER_ATTR(protocol, 0);
 198 CLUSTER_ATTR(timewarn_cs, 1);
 199 CLUSTER_ATTR(waitwarn_us, 0);
 200 CLUSTER_ATTR(new_rsb_count, 0);
 201 CLUSTER_ATTR(recover_callbacks, 0);
 202
 203 static struct configfs_attribute *cluster_attrs[] = {
 204         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
 205         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
 206         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
 207         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
 208         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
 209         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
 210         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
 211         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
 212         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
 213         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
 214         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
 215         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr,
 216         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr,
 217         NULL,
 218 };
 219
 220 enum {
 221         COMM_ATTR_NODEID = 0,
 222         COMM_ATTR_LOCAL,
 223         COMM_ATTR_ADDR,
 224         COMM_ATTR_ADDR_LIST,
 225 };
 226
 227 struct comm_attribute {
 228         struct configfs_attribute attr;
 229         ssize_t (*show)(struct dlm_comm *, char *);
 230         ssize_t (*store)(struct dlm_comm *, const char *, size_t);
 231 };
 232
 233 static struct comm_attribute comm_attr_nodeid = {
 234         .attr   = { .ca_owner = THIS_MODULE,
 235                     .ca_name = "nodeid",
 236                     .ca_mode = S_IRUGO | S_IWUSR },
 237         .show   = comm_nodeid_read,
 238         .store  = comm_nodeid_write,
 239 };
 240
 241 static struct comm_attribute comm_attr_local = {
 242         .attr   = { .ca_owner = THIS_MODULE,
 243                     .ca_name = "local",
 244                     .ca_mode = S_IRUGO | S_IWUSR },
 245         .show   = comm_local_read,
 246         .store  = comm_local_write,
 247 };
 248
 249 static struct comm_attribute comm_attr_addr = {
 250         .attr   = { .ca_owner = THIS_MODULE,
 251                     .ca_name = "addr",
 252                     .ca_mode = S_IWUSR },
 253         .store  = comm_addr_write,
 254 };
 255
 256 static struct comm_attribute comm_attr_addr_list = {
 257         .attr   = { .ca_owner = THIS_MODULE,
 258                     .ca_name = "addr_list",
 259                     .ca_mode = S_IRUGO },
 260         .show   = comm_addr_list_read,
 261 };
 262
 263 static struct configfs_attribute *comm_attrs[] = {
 264         [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
 265         [COMM_ATTR_LOCAL] = &comm_attr_local.attr,
 266         [COMM_ATTR_ADDR] = &comm_attr_addr.attr,
 267         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
 268         NULL,
 269 };
 270
 271 enum {
 272         NODE_ATTR_NODEID = 0,
 273         NODE_ATTR_WEIGHT,
 274 };
 275
 276 struct node_attribute {
 277         struct configfs_attribute attr;
 278         ssize_t (*show)(struct dlm_node *, char *);
 279         ssize_t (*store)(struct dlm_node *, const char *, size_t);
 280 };
 281
 282 static struct node_attribute node_attr_nodeid = {
 283         .attr   = { .ca_owner = THIS_MODULE,
 284                     .ca_name = "nodeid",
 285                     .ca_mode = S_IRUGO | S_IWUSR },
 286         .show   = node_nodeid_read,
 287         .store  = node_nodeid_write,
 288 };
 289
 290 static struct node_attribute node_attr_weight = {
 291         .attr   = { .ca_owner = THIS_MODULE,
 292                     .ca_name = "weight",
 293                     .ca_mode = S_IRUGO | S_IWUSR },
 294         .show   = node_weight_read,
 295         .store  = node_weight_write,
 296 };
 297
 298 static struct configfs_attribute *node_attrs[] = {
 299         [NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
 300         [NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
 301         NULL,
 302 };
 303
 304 struct dlm_clusters {
 305         struct configfs_subsystem subsys;
 306 };
 307
 308 struct dlm_spaces {
 309         struct config_group ss_group;
 310 };
 311
 312 struct dlm_space {
 313         struct config_group group;
 314         struct list_head members;
 315         struct mutex members_lock;
 316         int members_count;
 317 };
 318
 319 struct dlm_comms {
 320         struct config_group cs_group;
 321 };
 322
 323 struct dlm_comm {
 324         struct config_item item;
 325         int seq;
 326         int nodeid;
 327         int local;
 328         int addr_count;
 329         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 330 };
 331
 332 struct dlm_nodes {
 333         struct config_group ns_group;
 334 };
 335
 336 struct dlm_node {
 337         struct config_item item;
 338         struct list_head list; /* space->members */
 339         int nodeid;
 340         int weight;
 341         int new;
 342         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 343 };
 344
 345 static struct configfs_group_operations clusters_ops = {
 346         .make_group = make_cluster,
 347         .drop_item = drop_cluster,
 348 };
 349
 350 static struct configfs_item_operations cluster_ops = {
 351         .release = release_cluster,
 352         .show_attribute = show_cluster,
 353         .store_attribute = store_cluster,
 354 };
 355
 356 static struct configfs_group_operations spaces_ops = {
 357         .make_group = make_space,
 358         .drop_item = drop_space,
 359 };
 360
 361 static struct configfs_item_operations space_ops = {
 362         .release = release_space,
 363 };
 364
 365 static struct configfs_group_operations comms_ops = {
 366         .make_item = make_comm,
 367         .drop_item = drop_comm,
 368 };
 369
 370 static struct configfs_item_operations comm_ops = {
 371         .release = release_comm,
 372         .show_attribute = show_comm,
 373         .store_attribute = store_comm,
 374 };
 375
 376 static struct configfs_group_operations nodes_ops = {
 377         .make_item = make_node,
 378         .drop_item = drop_node,
 379 };
 380
 381 static struct configfs_item_operations node_ops = {
 382         .release = release_node,
 383         .show_attribute = show_node,
 384         .store_attribute = store_node,
 385 };
 386
 387 static struct config_item_type clusters_type = {
 388         .ct_group_ops = &clusters_ops,
 389         .ct_owner = THIS_MODULE,
 390 };
 391
 392 static struct config_item_type cluster_type = {
 393         .ct_item_ops = &cluster_ops,
 394         .ct_attrs = cluster_attrs,
 395         .ct_owner = THIS_MODULE,
 396 };
 397
 398 static struct config_item_type spaces_type = {
 399         .ct_group_ops = &spaces_ops,
 400         .ct_owner = THIS_MODULE,
 401 };
 402
 403 static struct config_item_type space_type = {
 404         .ct_item_ops = &space_ops,
 405         .ct_owner = THIS_MODULE,
 406 };
 407
 408 static struct config_item_type comms_type = {
 409         .ct_group_ops = &comms_ops,
 410         .ct_owner = THIS_MODULE,
 411 };
 412
 413 static struct config_item_type comm_type = {
 414         .ct_item_ops = &comm_ops,
 415         .ct_attrs = comm_attrs,
 416         .ct_owner = THIS_MODULE,
 417 };
 418
 419 static struct config_item_type nodes_type = {
 420         .ct_group_ops = &nodes_ops,
 421         .ct_owner = THIS_MODULE,
 422 };
 423
 424 static struct config_item_type node_type = {
 425         .ct_item_ops = &node_ops,
 426         .ct_attrs = node_attrs,
 427         .ct_owner = THIS_MODULE,
 428 };
 429
 430 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
 431 {
 432         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
 433                    NULL;
 434 }
 435
 436 static struct dlm_space *config_item_to_space(struct config_item *i)
 437 {
 438         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 439                    NULL;
 440 }
 441
 442 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 443 {
 444         return i ? container_of(i, struct dlm_comm, item) : NULL;
 445 }
 446
 447 static struct dlm_node *config_item_to_node(struct config_item *i)
 448 {
 449         return i ? container_of(i, struct dlm_node, item) : NULL;
 450 }
 451
 452 static struct config_group *make_cluster(struct config_group *g,
 453                                          const char *name)
 454 {
 455         struct dlm_cluster *cl = NULL;
 456         struct dlm_spaces *sps = NULL;
 457         struct dlm_comms *cms = NULL;
 458         void *gps = NULL;
 459
 460         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 461         gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
 462         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 463         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 464
 465         if (!cl || !gps || !sps || !cms)
 466                 goto fail;
 467
 468         config_group_init_type_name(&cl->group, name, &cluster_type);
 469         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 470         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 471
 472         cl->group.default_groups = gps;
 473         cl->group.default_groups[0] = &sps->ss_group;
 474         cl->group.default_groups[1] = &cms->cs_group;
 475         cl->group.default_groups[2] = NULL;
 476
 477         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 478         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 479         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 480         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 481         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 482         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 483         cl->cl_log_debug = dlm_config.ci_log_debug;
 484         cl->cl_protocol = dlm_config.ci_protocol;
 485         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 486         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 487         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 488         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 489         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 490                DLM_LOCKSPACE_LEN);
 491
 492         space_list = &sps->ss_group;
 493         comm_list = &cms->cs_group;
 494         return &cl->group;
 495
 496  fail:
 497         kfree(cl);
 498         kfree(gps);
 499         kfree(sps);
 500         kfree(cms);
 501         return ERR_PTR(-ENOMEM);
 502 }
 503
 504 static void drop_cluster(struct config_group *g, struct config_item *i)
 505 {
 506         struct dlm_cluster *cl = config_item_to_cluster(i);
 507         struct config_item *tmp;
 508         int j;
 509
 510         for (j = 0; cl->group.default_groups[j]; j++) {
 511                 tmp = &cl->group.default_groups[j]->cg_item;
 512                 cl->group.default_groups[j] = NULL;
 513                 config_item_put(tmp);
 514         }
 515
 516         space_list = NULL;
 517         comm_list = NULL;
 518
 519         config_item_put(i);
 520 }
 521
 522 static void release_cluster(struct config_item *i)
 523 {
 524         struct dlm_cluster *cl = config_item_to_cluster(i);
 525         kfree(cl->group.default_groups);
 526         kfree(cl);
 527 }
 528
 529 static struct config_group *make_space(struct config_group *g, const char *name)
 530 {
 531         struct dlm_space *sp = NULL;
 532         struct dlm_nodes *nds = NULL;
 533         void *gps = NULL;
 534
 535         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 536         gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
 537         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 538
 539         if (!sp || !gps || !nds)
 540                 goto fail;
 541
 542         config_group_init_type_name(&sp->group, name, &space_type);
 543         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 544
 545         sp->group.default_groups = gps;
 546         sp->group.default_groups[0] = &nds->ns_group;
 547         sp->group.default_groups[1] = NULL;
 548
 549         INIT_LIST_HEAD(&sp->members);
 550         mutex_init(&sp->members_lock);
 551         sp->members_count = 0;
 552         return &sp->group;
 553
 554  fail:
 555         kfree(sp);
 556         kfree(gps);
 557         kfree(nds);
 558         return ERR_PTR(-ENOMEM);
 559 }
 560
 561 static void drop_space(struct config_group *g, struct config_item *i)
 562 {
 563         struct dlm_space *sp = config_item_to_space(i);
 564         struct config_item *tmp;
 565         int j;
 566
 567         /* assert list_empty(&sp->members) */
 568
 569         for (j = 0; sp->group.default_groups[j]; j++) {
 570                 tmp = &sp->group.default_groups[j]->cg_item;
 571                 sp->group.default_groups[j] = NULL;
 572                 config_item_put(tmp);
 573         }
 574
 575         config_item_put(i);
 576 }
 577
 578 static void release_space(struct config_item *i)
 579 {
 580         struct dlm_space *sp = config_item_to_space(i);
 581         kfree(sp->group.default_groups);
 582         kfree(sp);
 583 }
 584
 585 static struct config_item *make_comm(struct config_group *g, const char *name)
 586 {
 587         struct dlm_comm *cm;
 588
 589         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 590         if (!cm)
 591                 return ERR_PTR(-ENOMEM);
 592
 593         config_item_init_type_name(&cm->item, name, &comm_type);
 594
 595         cm->seq = dlm_comm_count++;
 596         if (!cm->seq)
 597                 cm->seq = dlm_comm_count++;
 598
 599         cm->nodeid = -1;
 600         cm->local = 0;
 601         cm->addr_count = 0;
 602         return &cm->item;
 603 }
 604
 605 static void drop_comm(struct config_group *g, struct config_item *i)
 606 {
 607         struct dlm_comm *cm = config_item_to_comm(i);
 608         if (local_comm == cm)
 609                 local_comm = NULL;
 610         dlm_lowcomms_close(cm->nodeid);
 611         while (cm->addr_count--)
 612                 kfree(cm->addr[cm->addr_count]);
 613         config_item_put(i);
 614 }
 615
 616 static void release_comm(struct config_item *i)
 617 {
 618         struct dlm_comm *cm = config_item_to_comm(i);
 619         kfree(cm);
 620 }
 621
 622 static struct config_item *make_node(struct config_group *g, const char *name)
 623 {
 624         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 625         struct dlm_node *nd;
 626
 627         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 628         if (!nd)
 629                 return ERR_PTR(-ENOMEM);
 630
 631         config_item_init_type_name(&nd->item, name, &node_type);
 632         nd->nodeid = -1;
 633         nd->weight = 1;  /* default weight of 1 if none is set */
 634         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 635
 636         mutex_lock(&sp->members_lock);
 637         list_add(&nd->list, &sp->members);
 638         sp->members_count++;
 639         mutex_unlock(&sp->members_lock);
 640
 641         return &nd->item;
 642 }
 643
 644 static void drop_node(struct config_group *g, struct config_item *i)
 645 {
 646         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 647         struct dlm_node *nd = config_item_to_node(i);
 648
 649         mutex_lock(&sp->members_lock);
 650         list_del(&nd->list);
 651         sp->members_count--;
 652         mutex_unlock(&sp->members_lock);
 653
 654         config_item_put(i);
 655 }
 656
 657 static void release_node(struct config_item *i)
 658 {
 659         struct dlm_node *nd = config_item_to_node(i);
 660         kfree(nd);
 661 }
 662
 663 static struct dlm_clusters clusters_root = {
 664         .subsys = {
 665                 .su_group = {
 666                         .cg_item = {
 667                                 .ci_namebuf = "dlm",
 668                                 .ci_type = &clusters_type,
 669                         },
 670                 },
 671         },
 672 };
 673
 674 int __init dlm_config_init(void)
 675 {
 676         config_group_init(&clusters_root.subsys.su_group);
 677         mutex_init(&clusters_root.subsys.su_mutex);
 678         return configfs_register_subsystem(&clusters_root.subsys);
 679 }
 680
 681 void dlm_config_exit(void)
 682 {
 683         configfs_unregister_subsystem(&clusters_root.subsys);
 684 }
 685
 686 /*
 687  * Functions for user space to read/write attributes
 688  */
 689
 690 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
 691                             char *buf)
 692 {
 693         struct dlm_cluster *cl = config_item_to_cluster(i);
 694         struct cluster_attribute *cla =
 695                         container_of(a, struct cluster_attribute, attr);
 696         return cla->show ? cla->show(cl, buf) : 0;
 697 }
 698
 699 static ssize_t store_cluster(struct config_item *i,
 700                              struct configfs_attribute *a,
 701                              const char *buf, size_t len)
 702 {
 703         struct dlm_cluster *cl = config_item_to_cluster(i);
 704         struct cluster_attribute *cla =
 705                 container_of(a, struct cluster_attribute, attr);
 706         return cla->store ? cla->store(cl, buf, len) : -EINVAL;
 707 }
 708
 709 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
 710                          char *buf)
 711 {
 712         struct dlm_comm *cm = config_item_to_comm(i);
 713         struct comm_attribute *cma =
 714                         container_of(a, struct comm_attribute, attr);
 715         return cma->show ? cma->show(cm, buf) : 0;
 716 }
 717
 718 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
 719                           const char *buf, size_t len)
 720 {
 721         struct dlm_comm *cm = config_item_to_comm(i);
 722         struct comm_attribute *cma =
 723                 container_of(a, struct comm_attribute, attr);
 724         return cma->store ? cma->store(cm, buf, len) : -EINVAL;
 725 }
 726
 727 static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
 728 {
 729         return sprintf(buf, "%d\n", cm->nodeid);
 730 }
 731
 732 static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
 733                                  size_t len)
 734 {
 735         int rc = kstrtoint(buf, 0, &cm->nodeid);
 736
 737         if (rc)
 738                 return rc;
 739         return len;
 740 }
 741
 742 static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
 743 {
 744         return sprintf(buf, "%d\n", cm->local);
 745 }
 746
 747 static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
 748                                 size_t len)
 749 {
 750         int rc = kstrtoint(buf, 0, &cm->local);
 751
 752         if (rc)
 753                 return rc;
 754         if (cm->local && !local_comm)
 755                 local_comm = cm;
 756         return len;
 757 }
 758
 759 static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
 760 {
 761         struct sockaddr_storage *addr;
 762         int rv;
 763
 764         if (len != sizeof(struct sockaddr_storage))
 765                 return -EINVAL;
 766
 767         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 768                 return -ENOSPC;
 769
 770         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 771         if (!addr)
 772                 return -ENOMEM;
 773
 774         memcpy(addr, buf, len);
 775
 776         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 777         if (rv) {
 778                 kfree(addr);
 779                 return rv;
 780         }
 781
 782         cm->addr[cm->addr_count++] = addr;
 783         return len;
 784 }
 785
 786 static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
 787 {
 788         ssize_t s;
 789         ssize_t allowance;
 790         int i;
 791         struct sockaddr_storage *addr;
 792         struct sockaddr_in *addr_in;
 793         struct sockaddr_in6 *addr_in6;
 794
 795         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 796         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 797
 798
 799         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 800         allowance = 4096;
 801         buf[0] = '\0';
 802
 803         for (i = 0; i < cm->addr_count; i++) {
 804                 addr = cm->addr[i];
 805
 806                 switch(addr->ss_family) {
 807                 case AF_INET:
 808                         addr_in = (struct sockaddr_in *)addr;
 809                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 810                         break;
 811                 case AF_INET6:
 812                         addr_in6 = (struct sockaddr_in6 *)addr;
 813                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 814                         break;
 815                 default:
 816                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 817                         break;
 818                 }
 819                 allowance -= s;
 820                 if (allowance >= 0)
 821                         strcat(buf, buf0);
 822                 else {
 823                         allowance += s;
 824                         break;
 825                 }
 826         }
 827         return 4096 - allowance;
 828 }
 829
 830 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
 831                          char *buf)
 832 {
 833         struct dlm_node *nd = config_item_to_node(i);
 834         struct node_attribute *nda =
 835                         container_of(a, struct node_attribute, attr);
 836         return nda->show ? nda->show(nd, buf) : 0;
 837 }
 838
 839 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
 840                           const char *buf, size_t len)
 841 {
 842         struct dlm_node *nd = config_item_to_node(i);
 843         struct node_attribute *nda =
 844                 container_of(a, struct node_attribute, attr);
 845         return nda->store ? nda->store(nd, buf, len) : -EINVAL;
 846 }
 847
 848 static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
 849 {
 850         return sprintf(buf, "%d\n", nd->nodeid);
 851 }
 852
 853 static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
 854                                  size_t len)
 855 {
 856         uint32_t seq = 0;
 857         int rc = kstrtoint(buf, 0, &nd->nodeid);
 858
 859         if (rc)
 860                 return rc;
 861         dlm_comm_seq(nd->nodeid, &seq);
 862         nd->comm_seq = seq;
 863         return len;
 864 }
 865
 866 static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
 867 {
 868         return sprintf(buf, "%d\n", nd->weight);
 869 }
 870
 871 static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
 872                                  size_t len)
 873 {
 874         int rc = kstrtoint(buf, 0, &nd->weight);
 875
 876         if (rc)
 877                 return rc;
 878         return len;
 879 }
 880
 881 /*
 882  * Functions for the dlm to get the info that's been configured
 883  */
 884
 885 static struct dlm_space *get_space(char *name)
 886 {
 887         struct config_item *i;
 888
 889         if (!space_list)
 890                 return NULL;
 891
 892         mutex_lock(&space_list->cg_subsys->su_mutex);
 893         i = config_group_find_item(space_list, name);
 894         mutex_unlock(&space_list->cg_subsys->su_mutex);
 895
 896         return config_item_to_space(i);
 897 }
 898
 899 static void put_space(struct dlm_space *sp)
 900 {
 901         config_item_put(&sp->group.cg_item);
 902 }
 903
 904 static struct dlm_comm *get_comm(int nodeid)
 905 {
 906         struct config_item *i;
 907         struct dlm_comm *cm = NULL;
 908         int found = 0;
 909
 910         if (!comm_list)
 911                 return NULL;
 912
 913         mutex_lock(&clusters_root.subsys.su_mutex);
 914
 915         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 916                 cm = config_item_to_comm(i);
 917
 918                 if (cm->nodeid != nodeid)
 919                         continue;
 920                 found = 1;
 921                 config_item_get(i);
 922                 break;
 923         }
 924         mutex_unlock(&clusters_root.subsys.su_mutex);
 925
 926         if (!found)
 927                 cm = NULL;
 928         return cm;
 929 }
 930
 931 static void put_comm(struct dlm_comm *cm)
 932 {
 933         config_item_put(&cm->item);
 934 }
 935
 936 /* caller must free mem */
 937 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 938                      int *count_out)
 939 {
 940         struct dlm_space *sp;
 941         struct dlm_node *nd;
 942         struct dlm_config_node *nodes, *node;
 943         int rv, count;
 944
 945         sp = get_space(lsname);
 946         if (!sp)
 947                 return -EEXIST;
 948
 949         mutex_lock(&sp->members_lock);
 950         if (!sp->members_count) {
 951                 rv = -EINVAL;
 952                 printk(KERN_ERR "dlm: zero members_count\n");
 953                 goto out;
 954         }
 955
 956         count = sp->members_count;
 957
 958         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 959         if (!nodes) {
 960                 rv = -ENOMEM;
 961                 goto out;
 962         }
 963
 964         node = nodes;
 965         list_for_each_entry(nd, &sp->members, list) {
 966                 node->nodeid = nd->nodeid;
 967                 node->weight = nd->weight;
 968                 node->new = nd->new;
 969                 node->comm_seq = nd->comm_seq;
 970                 node++;
 971
 972                 nd->new = 0;
 973         }
 974
 975         *count_out = count;
 976         *nodes_out = nodes;
 977         rv = 0;
 978  out:
 979         mutex_unlock(&sp->members_lock);
 980         put_space(sp);
 981         return rv;
 982 }
 983
 984 int dlm_comm_seq(int nodeid, uint32_t *seq)
 985 {
 986         struct dlm_comm *cm = get_comm(nodeid);
 987         if (!cm)
 988                 return -EEXIST;
 989         *seq = cm->seq;
 990         put_comm(cm);
 991         return 0;
 992 }
 993
 994 int dlm_our_nodeid(void)
 995 {
 996         return local_comm ? local_comm->nodeid : 0;
 997 }
 998
 999 /* num 0 is first addr, num 1 is second addr */
1000 int dlm_our_addr(struct sockaddr_storage *addr, int num)
1001 {
1002         if (!local_comm)
1003                 return -1;
1004         if (num + 1 > local_comm->addr_count)
1005                 return -1;
1006         memcpy(addr, local_comm->addr[num], sizeof(*addr));
1007         return 0;
1008 }
1009
1010 /* Config file defaults */
1011 #define DEFAULT_TCP_PORT       21064
1012 #define DEFAULT_BUFFER_SIZE     4096
1013 #define DEFAULT_RSBTBL_SIZE     1024
1014 #define DEFAULT_RECOVER_TIMER      5
1015 #define DEFAULT_TOSS_SECS         10
1016 #define DEFAULT_SCAN_SECS          5
1017 #define DEFAULT_LOG_DEBUG          0
1018 #define DEFAULT_PROTOCOL           0
1019 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
1020 #define DEFAULT_WAITWARN_US        0
1021 #define DEFAULT_NEW_RSB_COUNT    128
1022 #define DEFAULT_RECOVER_CALLBACKS  0
1023 #define DEFAULT_CLUSTER_NAME      ""
1024
1025 struct dlm_config_info dlm_config = {
1026         .ci_tcp_port = DEFAULT_TCP_PORT,
1027         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
1028         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
1029         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
1030         .ci_toss_secs = DEFAULT_TOSS_SECS,
1031         .ci_scan_secs = DEFAULT_SCAN_SECS,
1032         .ci_log_debug = DEFAULT_LOG_DEBUG,
1033         .ci_protocol = DEFAULT_PROTOCOL,
1034         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
1035         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
1036         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
1037         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
1038         .ci_cluster_name = DEFAULT_CLUSTER_NAME
1039 };
1040