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