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 "midcomms.h"
  24 #include "lowcomms.h"
  25
  26 /*
  27  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  29  * /config/dlm/<cluster>/comms/<comm>/nodeid
  30  * /config/dlm/<cluster>/comms/<comm>/local
  31  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  32  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  33  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  34  */
  35
  36 static struct config_group *space_list;
  37 static struct config_group *comm_list;
  38 static struct dlm_comm *local_comm;
  39 static uint32_t dlm_comm_count;
  40
  41 struct dlm_clusters;
  42 struct dlm_cluster;
  43 struct dlm_spaces;
  44 struct dlm_space;
  45 struct dlm_comms;
  46 struct dlm_comm;
  47 struct dlm_nodes;
  48 struct dlm_node;
  49
  50 static struct config_group *make_cluster(struct config_group *, const char *);
  51 static void drop_cluster(struct config_group *, struct config_item *);
  52 static void release_cluster(struct config_item *);
  53 static struct config_group *make_space(struct config_group *, const char *);
  54 static void drop_space(struct config_group *, struct config_item *);
  55 static void release_space(struct config_item *);
  56 static struct config_item *make_comm(struct config_group *, const char *);
  57 static void drop_comm(struct config_group *, struct config_item *);
  58 static void release_comm(struct config_item *);
  59 static struct config_item *make_node(struct config_group *, const char *);
  60 static void drop_node(struct config_group *, struct config_item *);
  61 static void release_node(struct config_item *);
  62
  63 static struct configfs_attribute *comm_attrs[];
  64 static struct configfs_attribute *node_attrs[];
  65
  66 struct dlm_cluster {
  67         struct config_group group;
  68         unsigned int cl_tcp_port;
  69         unsigned int cl_buffer_size;
  70         unsigned int cl_rsbtbl_size;
  71         unsigned int cl_recover_timer;
  72         unsigned int cl_toss_secs;
  73         unsigned int cl_scan_secs;
  74         unsigned int cl_log_debug;
  75         unsigned int cl_log_info;
  76         unsigned int cl_protocol;
  77         unsigned int cl_mark;
  78         unsigned int cl_timewarn_cs;
  79         unsigned int cl_waitwarn_us;
  80         unsigned int cl_new_rsb_count;
  81         unsigned int cl_recover_callbacks;
  82         char cl_cluster_name[DLM_LOCKSPACE_LEN];
  83
  84         struct dlm_spaces *sps;
  85         struct dlm_comms *cms;
  86 };
  87
  88 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  89 {
  90         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  91                    NULL;
  92 }
  93
  94 enum {
  95         CLUSTER_ATTR_TCP_PORT = 0,
  96         CLUSTER_ATTR_BUFFER_SIZE,
  97         CLUSTER_ATTR_RSBTBL_SIZE,
  98         CLUSTER_ATTR_RECOVER_TIMER,
  99         CLUSTER_ATTR_TOSS_SECS,
 100         CLUSTER_ATTR_SCAN_SECS,
 101         CLUSTER_ATTR_LOG_DEBUG,
 102         CLUSTER_ATTR_LOG_INFO,
 103         CLUSTER_ATTR_PROTOCOL,
 104         CLUSTER_ATTR_MARK,
 105         CLUSTER_ATTR_TIMEWARN_CS,
 106         CLUSTER_ATTR_WAITWARN_US,
 107         CLUSTER_ATTR_NEW_RSB_COUNT,
 108         CLUSTER_ATTR_RECOVER_CALLBACKS,
 109         CLUSTER_ATTR_CLUSTER_NAME,
 110 };
 111
 112 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
 113 {
 114         struct dlm_cluster *cl = config_item_to_cluster(item);
 115         return sprintf(buf, "%s\n", cl->cl_cluster_name);
 116 }
 117
 118 static ssize_t cluster_cluster_name_store(struct config_item *item,
 119                                           const char *buf, size_t len)
 120 {
 121         struct dlm_cluster *cl = config_item_to_cluster(item);
 122
 123         strlcpy(dlm_config.ci_cluster_name, buf,
 124                                 sizeof(dlm_config.ci_cluster_name));
 125         strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
 126         return len;
 127 }
 128
 129 CONFIGFS_ATTR(cluster_, cluster_name);
 130
 131 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 132                            int *info_field, int (*check_cb)(unsigned int x),
 133                            const char *buf, size_t len)
 134 {
 135         unsigned int x;
 136         int rc;
 137
 138         if (!capable(CAP_SYS_ADMIN))
 139                 return -EPERM;
 140         rc = kstrtouint(buf, 0, &x);
 141         if (rc)
 142                 return rc;
 143
 144         if (check_cb) {
 145                 rc = check_cb(x);
 146                 if (rc)
 147                         return rc;
 148         }
 149
 150         *cl_field = x;
 151         *info_field = x;
 152
 153         return len;
 154 }
 155
 156 #define CLUSTER_ATTR(name, check_cb)                                          \
 157 static ssize_t cluster_##name##_store(struct config_item *item, \
 158                 const char *buf, size_t len) \
 159 {                                                                             \
 160         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 161         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 162                            check_cb, buf, len);                               \
 163 }                                                                             \
 164 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 165 {                                                                             \
 166         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 167         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 168 }                                                                             \
 169 CONFIGFS_ATTR(cluster_, name);
 170
 171 static int dlm_check_protocol_and_dlm_running(unsigned int x)
 172 {
 173         switch (x) {
 174         case 0:
 175                 /* TCP */
 176                 break;
 177         case 1:
 178                 /* SCTP */
 179                 break;
 180         default:
 181                 return -EINVAL;
 182         }
 183
 184         if (dlm_allow_conn)
 185                 return -EBUSY;
 186
 187         return 0;
 188 }
 189
 190 static int dlm_check_zero_and_dlm_running(unsigned int x)
 191 {
 192         if (!x)
 193                 return -EINVAL;
 194
 195         if (dlm_allow_conn)
 196                 return -EBUSY;
 197
 198         return 0;
 199 }
 200
 201 static int dlm_check_zero(unsigned int x)
 202 {
 203         if (!x)
 204                 return -EINVAL;
 205
 206         return 0;
 207 }
 208
 209 static int dlm_check_buffer_size(unsigned int x)
 210 {
 211         if (x < DLM_MAX_SOCKET_BUFSIZE)
 212                 return -EINVAL;
 213
 214         return 0;
 215 }
 216
 217 CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
 218 CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
 219 CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
 220 CLUSTER_ATTR(recover_timer, dlm_check_zero);
 221 CLUSTER_ATTR(toss_secs, dlm_check_zero);
 222 CLUSTER_ATTR(scan_secs, dlm_check_zero);
 223 CLUSTER_ATTR(log_debug, NULL);
 224 CLUSTER_ATTR(log_info, NULL);
 225 CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
 226 CLUSTER_ATTR(mark, NULL);
 227 CLUSTER_ATTR(timewarn_cs, dlm_check_zero);
 228 CLUSTER_ATTR(waitwarn_us, NULL);
 229 CLUSTER_ATTR(new_rsb_count, NULL);
 230 CLUSTER_ATTR(recover_callbacks, NULL);
 231
 232 static struct configfs_attribute *cluster_attrs[] = {
 233         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 234         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 235         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 236         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 237         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 238         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 239         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 240         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 241         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 242         [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
 243         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 244         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
 245         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 246         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 247         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 248         NULL,
 249 };
 250
 251 enum {
 252         COMM_ATTR_NODEID = 0,
 253         COMM_ATTR_LOCAL,
 254         COMM_ATTR_ADDR,
 255         COMM_ATTR_ADDR_LIST,
 256         COMM_ATTR_MARK,
 257 };
 258
 259 enum {
 260         NODE_ATTR_NODEID = 0,
 261         NODE_ATTR_WEIGHT,
 262 };
 263
 264 struct dlm_clusters {
 265         struct configfs_subsystem subsys;
 266 };
 267
 268 struct dlm_spaces {
 269         struct config_group ss_group;
 270 };
 271
 272 struct dlm_space {
 273         struct config_group group;
 274         struct list_head members;
 275         struct mutex members_lock;
 276         int members_count;
 277         struct dlm_nodes *nds;
 278 };
 279
 280 struct dlm_comms {
 281         struct config_group cs_group;
 282 };
 283
 284 struct dlm_comm {
 285         struct config_item item;
 286         int seq;
 287         int nodeid;
 288         int local;
 289         int addr_count;
 290         unsigned int mark;
 291         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 292 };
 293
 294 struct dlm_nodes {
 295         struct config_group ns_group;
 296 };
 297
 298 struct dlm_node {
 299         struct config_item item;
 300         struct list_head list; /* space->members */
 301         int nodeid;
 302         int weight;
 303         int new;
 304         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 305 };
 306
 307 static struct configfs_group_operations clusters_ops = {
 308         .make_group = make_cluster,
 309         .drop_item = drop_cluster,
 310 };
 311
 312 static struct configfs_item_operations cluster_ops = {
 313         .release = release_cluster,
 314 };
 315
 316 static struct configfs_group_operations spaces_ops = {
 317         .make_group = make_space,
 318         .drop_item = drop_space,
 319 };
 320
 321 static struct configfs_item_operations space_ops = {
 322         .release = release_space,
 323 };
 324
 325 static struct configfs_group_operations comms_ops = {
 326         .make_item = make_comm,
 327         .drop_item = drop_comm,
 328 };
 329
 330 static struct configfs_item_operations comm_ops = {
 331         .release = release_comm,
 332 };
 333
 334 static struct configfs_group_operations nodes_ops = {
 335         .make_item = make_node,
 336         .drop_item = drop_node,
 337 };
 338
 339 static struct configfs_item_operations node_ops = {
 340         .release = release_node,
 341 };
 342
 343 static const struct config_item_type clusters_type = {
 344         .ct_group_ops = &clusters_ops,
 345         .ct_owner = THIS_MODULE,
 346 };
 347
 348 static const struct config_item_type cluster_type = {
 349         .ct_item_ops = &cluster_ops,
 350         .ct_attrs = cluster_attrs,
 351         .ct_owner = THIS_MODULE,
 352 };
 353
 354 static const struct config_item_type spaces_type = {
 355         .ct_group_ops = &spaces_ops,
 356         .ct_owner = THIS_MODULE,
 357 };
 358
 359 static const struct config_item_type space_type = {
 360         .ct_item_ops = &space_ops,
 361         .ct_owner = THIS_MODULE,
 362 };
 363
 364 static const struct config_item_type comms_type = {
 365         .ct_group_ops = &comms_ops,
 366         .ct_owner = THIS_MODULE,
 367 };
 368
 369 static const struct config_item_type comm_type = {
 370         .ct_item_ops = &comm_ops,
 371         .ct_attrs = comm_attrs,
 372         .ct_owner = THIS_MODULE,
 373 };
 374
 375 static const struct config_item_type nodes_type = {
 376         .ct_group_ops = &nodes_ops,
 377         .ct_owner = THIS_MODULE,
 378 };
 379
 380 static const struct config_item_type node_type = {
 381         .ct_item_ops = &node_ops,
 382         .ct_attrs = node_attrs,
 383         .ct_owner = THIS_MODULE,
 384 };
 385
 386 static struct dlm_space *config_item_to_space(struct config_item *i)
 387 {
 388         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 389                    NULL;
 390 }
 391
 392 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 393 {
 394         return i ? container_of(i, struct dlm_comm, item) : NULL;
 395 }
 396
 397 static struct dlm_node *config_item_to_node(struct config_item *i)
 398 {
 399         return i ? container_of(i, struct dlm_node, item) : NULL;
 400 }
 401
 402 static struct config_group *make_cluster(struct config_group *g,
 403                                          const char *name)
 404 {
 405         struct dlm_cluster *cl = NULL;
 406         struct dlm_spaces *sps = NULL;
 407         struct dlm_comms *cms = NULL;
 408
 409         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 410         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 411         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 412
 413         if (!cl || !sps || !cms)
 414                 goto fail;
 415
 416         cl->sps = sps;
 417         cl->cms = cms;
 418
 419         config_group_init_type_name(&cl->group, name, &cluster_type);
 420         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 421         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 422
 423         configfs_add_default_group(&sps->ss_group, &cl->group);
 424         configfs_add_default_group(&cms->cs_group, &cl->group);
 425
 426         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 427         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 428         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 429         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 430         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 431         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 432         cl->cl_log_debug = dlm_config.ci_log_debug;
 433         cl->cl_log_info = dlm_config.ci_log_info;
 434         cl->cl_protocol = dlm_config.ci_protocol;
 435         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 436         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 437         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 438         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 439         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 440                DLM_LOCKSPACE_LEN);
 441
 442         space_list = &sps->ss_group;
 443         comm_list = &cms->cs_group;
 444         return &cl->group;
 445
 446  fail:
 447         kfree(cl);
 448         kfree(sps);
 449         kfree(cms);
 450         return ERR_PTR(-ENOMEM);
 451 }
 452
 453 static void drop_cluster(struct config_group *g, struct config_item *i)
 454 {
 455         struct dlm_cluster *cl = config_item_to_cluster(i);
 456
 457         configfs_remove_default_groups(&cl->group);
 458
 459         space_list = NULL;
 460         comm_list = NULL;
 461
 462         config_item_put(i);
 463 }
 464
 465 static void release_cluster(struct config_item *i)
 466 {
 467         struct dlm_cluster *cl = config_item_to_cluster(i);
 468
 469         kfree(cl->sps);
 470         kfree(cl->cms);
 471         kfree(cl);
 472 }
 473
 474 static struct config_group *make_space(struct config_group *g, const char *name)
 475 {
 476         struct dlm_space *sp = NULL;
 477         struct dlm_nodes *nds = NULL;
 478
 479         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 480         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 481
 482         if (!sp || !nds)
 483                 goto fail;
 484
 485         config_group_init_type_name(&sp->group, name, &space_type);
 486
 487         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 488         configfs_add_default_group(&nds->ns_group, &sp->group);
 489
 490         INIT_LIST_HEAD(&sp->members);
 491         mutex_init(&sp->members_lock);
 492         sp->members_count = 0;
 493         sp->nds = nds;
 494         return &sp->group;
 495
 496  fail:
 497         kfree(sp);
 498         kfree(nds);
 499         return ERR_PTR(-ENOMEM);
 500 }
 501
 502 static void drop_space(struct config_group *g, struct config_item *i)
 503 {
 504         struct dlm_space *sp = config_item_to_space(i);
 505
 506         /* assert list_empty(&sp->members) */
 507
 508         configfs_remove_default_groups(&sp->group);
 509         config_item_put(i);
 510 }
 511
 512 static void release_space(struct config_item *i)
 513 {
 514         struct dlm_space *sp = config_item_to_space(i);
 515         kfree(sp->nds);
 516         kfree(sp);
 517 }
 518
 519 static struct config_item *make_comm(struct config_group *g, const char *name)
 520 {
 521         struct dlm_comm *cm;
 522
 523         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 524         if (!cm)
 525                 return ERR_PTR(-ENOMEM);
 526
 527         config_item_init_type_name(&cm->item, name, &comm_type);
 528
 529         cm->seq = dlm_comm_count++;
 530         if (!cm->seq)
 531                 cm->seq = dlm_comm_count++;
 532
 533         cm->nodeid = -1;
 534         cm->local = 0;
 535         cm->addr_count = 0;
 536         cm->mark = 0;
 537         return &cm->item;
 538 }
 539
 540 static void drop_comm(struct config_group *g, struct config_item *i)
 541 {
 542         struct dlm_comm *cm = config_item_to_comm(i);
 543         if (local_comm == cm)
 544                 local_comm = NULL;
 545         dlm_midcomms_close(cm->nodeid);
 546         while (cm->addr_count--)
 547                 kfree(cm->addr[cm->addr_count]);
 548         config_item_put(i);
 549 }
 550
 551 static void release_comm(struct config_item *i)
 552 {
 553         struct dlm_comm *cm = config_item_to_comm(i);
 554         kfree(cm);
 555 }
 556
 557 static struct config_item *make_node(struct config_group *g, const char *name)
 558 {
 559         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 560         struct dlm_node *nd;
 561
 562         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 563         if (!nd)
 564                 return ERR_PTR(-ENOMEM);
 565
 566         config_item_init_type_name(&nd->item, name, &node_type);
 567         nd->nodeid = -1;
 568         nd->weight = 1;  /* default weight of 1 if none is set */
 569         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 570
 571         mutex_lock(&sp->members_lock);
 572         list_add(&nd->list, &sp->members);
 573         sp->members_count++;
 574         mutex_unlock(&sp->members_lock);
 575
 576         return &nd->item;
 577 }
 578
 579 static void drop_node(struct config_group *g, struct config_item *i)
 580 {
 581         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 582         struct dlm_node *nd = config_item_to_node(i);
 583
 584         mutex_lock(&sp->members_lock);
 585         list_del(&nd->list);
 586         sp->members_count--;
 587         mutex_unlock(&sp->members_lock);
 588
 589         config_item_put(i);
 590 }
 591
 592 static void release_node(struct config_item *i)
 593 {
 594         struct dlm_node *nd = config_item_to_node(i);
 595         kfree(nd);
 596 }
 597
 598 static struct dlm_clusters clusters_root = {
 599         .subsys = {
 600                 .su_group = {
 601                         .cg_item = {
 602                                 .ci_namebuf = "dlm",
 603                                 .ci_type = &clusters_type,
 604                         },
 605                 },
 606         },
 607 };
 608
 609 int __init dlm_config_init(void)
 610 {
 611         config_group_init(&clusters_root.subsys.su_group);
 612         mutex_init(&clusters_root.subsys.su_mutex);
 613         return configfs_register_subsystem(&clusters_root.subsys);
 614 }
 615
 616 void dlm_config_exit(void)
 617 {
 618         configfs_unregister_subsystem(&clusters_root.subsys);
 619 }
 620
 621 /*
 622  * Functions for user space to read/write attributes
 623  */
 624
 625 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 626 {
 627         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 628 }
 629
 630 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 631                                  size_t len)
 632 {
 633         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 634
 635         if (rc)
 636                 return rc;
 637         return len;
 638 }
 639
 640 static ssize_t comm_local_show(struct config_item *item, char *buf)
 641 {
 642         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 643 }
 644
 645 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 646                                 size_t len)
 647 {
 648         struct dlm_comm *cm = config_item_to_comm(item);
 649         int rc = kstrtoint(buf, 0, &cm->local);
 650
 651         if (rc)
 652                 return rc;
 653         if (cm->local && !local_comm)
 654                 local_comm = cm;
 655         return len;
 656 }
 657
 658 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 659                 size_t len)
 660 {
 661         struct dlm_comm *cm = config_item_to_comm(item);
 662         struct sockaddr_storage *addr;
 663         int rv;
 664
 665         if (len != sizeof(struct sockaddr_storage))
 666                 return -EINVAL;
 667
 668         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 669                 return -ENOSPC;
 670
 671         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 672         if (!addr)
 673                 return -ENOMEM;
 674
 675         memcpy(addr, buf, len);
 676
 677         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 678         if (rv) {
 679                 kfree(addr);
 680                 return rv;
 681         }
 682
 683         cm->addr[cm->addr_count++] = addr;
 684         return len;
 685 }
 686
 687 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 688 {
 689         struct dlm_comm *cm = config_item_to_comm(item);
 690         ssize_t s;
 691         ssize_t allowance;
 692         int i;
 693         struct sockaddr_storage *addr;
 694         struct sockaddr_in *addr_in;
 695         struct sockaddr_in6 *addr_in6;
 696
 697         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 698         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 699
 700
 701         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 702         allowance = 4096;
 703         buf[0] = '\0';
 704
 705         for (i = 0; i < cm->addr_count; i++) {
 706                 addr = cm->addr[i];
 707
 708                 switch(addr->ss_family) {
 709                 case AF_INET:
 710                         addr_in = (struct sockaddr_in *)addr;
 711                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 712                         break;
 713                 case AF_INET6:
 714                         addr_in6 = (struct sockaddr_in6 *)addr;
 715                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 716                         break;
 717                 default:
 718                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 719                         break;
 720                 }
 721                 allowance -= s;
 722                 if (allowance >= 0)
 723                         strcat(buf, buf0);
 724                 else {
 725                         allowance += s;
 726                         break;
 727                 }
 728         }
 729         return 4096 - allowance;
 730 }
 731
 732 static ssize_t comm_mark_show(struct config_item *item, char *buf)
 733 {
 734         return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
 735 }
 736
 737 static ssize_t comm_mark_store(struct config_item *item, const char *buf,
 738                                size_t len)
 739 {
 740         struct dlm_comm *comm;
 741         unsigned int mark;
 742         int rc;
 743
 744         rc = kstrtouint(buf, 0, &mark);
 745         if (rc)
 746                 return rc;
 747
 748         if (mark == 0)
 749                 mark = dlm_config.ci_mark;
 750
 751         comm = config_item_to_comm(item);
 752         rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
 753         if (rc)
 754                 return rc;
 755
 756         comm->mark = mark;
 757         return len;
 758 }
 759
 760 CONFIGFS_ATTR(comm_, nodeid);
 761 CONFIGFS_ATTR(comm_, local);
 762 CONFIGFS_ATTR(comm_, mark);
 763 CONFIGFS_ATTR_WO(comm_, addr);
 764 CONFIGFS_ATTR_RO(comm_, addr_list);
 765
 766 static struct configfs_attribute *comm_attrs[] = {
 767         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 768         [COMM_ATTR_LOCAL] = &comm_attr_local,
 769         [COMM_ATTR_ADDR] = &comm_attr_addr,
 770         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 771         [COMM_ATTR_MARK] = &comm_attr_mark,
 772         NULL,
 773 };
 774
 775 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 776 {
 777         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 778 }
 779
 780 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 781                                  size_t len)
 782 {
 783         struct dlm_node *nd = config_item_to_node(item);
 784         uint32_t seq = 0;
 785         int rc = kstrtoint(buf, 0, &nd->nodeid);
 786
 787         if (rc)
 788                 return rc;
 789         dlm_comm_seq(nd->nodeid, &seq);
 790         nd->comm_seq = seq;
 791         return len;
 792 }
 793
 794 static ssize_t node_weight_show(struct config_item *item, char *buf)
 795 {
 796         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 797 }
 798
 799 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 800                                  size_t len)
 801 {
 802         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 803
 804         if (rc)
 805                 return rc;
 806         return len;
 807 }
 808
 809 CONFIGFS_ATTR(node_, nodeid);
 810 CONFIGFS_ATTR(node_, weight);
 811
 812 static struct configfs_attribute *node_attrs[] = {
 813         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 814         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 815         NULL,
 816 };
 817
 818 /*
 819  * Functions for the dlm to get the info that's been configured
 820  */
 821
 822 static struct dlm_space *get_space(char *name)
 823 {
 824         struct config_item *i;
 825
 826         if (!space_list)
 827                 return NULL;
 828
 829         mutex_lock(&space_list->cg_subsys->su_mutex);
 830         i = config_group_find_item(space_list, name);
 831         mutex_unlock(&space_list->cg_subsys->su_mutex);
 832
 833         return config_item_to_space(i);
 834 }
 835
 836 static void put_space(struct dlm_space *sp)
 837 {
 838         config_item_put(&sp->group.cg_item);
 839 }
 840
 841 static struct dlm_comm *get_comm(int nodeid)
 842 {
 843         struct config_item *i;
 844         struct dlm_comm *cm = NULL;
 845         int found = 0;
 846
 847         if (!comm_list)
 848                 return NULL;
 849
 850         mutex_lock(&clusters_root.subsys.su_mutex);
 851
 852         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 853                 cm = config_item_to_comm(i);
 854
 855                 if (cm->nodeid != nodeid)
 856                         continue;
 857                 found = 1;
 858                 config_item_get(i);
 859                 break;
 860         }
 861         mutex_unlock(&clusters_root.subsys.su_mutex);
 862
 863         if (!found)
 864                 cm = NULL;
 865         return cm;
 866 }
 867
 868 static void put_comm(struct dlm_comm *cm)
 869 {
 870         config_item_put(&cm->item);
 871 }
 872
 873 /* caller must free mem */
 874 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 875                      int *count_out)
 876 {
 877         struct dlm_space *sp;
 878         struct dlm_node *nd;
 879         struct dlm_config_node *nodes, *node;
 880         int rv, count;
 881
 882         sp = get_space(lsname);
 883         if (!sp)
 884                 return -EEXIST;
 885
 886         mutex_lock(&sp->members_lock);
 887         if (!sp->members_count) {
 888                 rv = -EINVAL;
 889                 printk(KERN_ERR "dlm: zero members_count\n");
 890                 goto out;
 891         }
 892
 893         count = sp->members_count;
 894
 895         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 896         if (!nodes) {
 897                 rv = -ENOMEM;
 898                 goto out;
 899         }
 900
 901         node = nodes;
 902         list_for_each_entry(nd, &sp->members, list) {
 903                 node->nodeid = nd->nodeid;
 904                 node->weight = nd->weight;
 905                 node->new = nd->new;
 906                 node->comm_seq = nd->comm_seq;
 907                 node++;
 908
 909                 nd->new = 0;
 910         }
 911
 912         *count_out = count;
 913         *nodes_out = nodes;
 914         rv = 0;
 915  out:
 916         mutex_unlock(&sp->members_lock);
 917         put_space(sp);
 918         return rv;
 919 }
 920
 921 int dlm_comm_seq(int nodeid, uint32_t *seq)
 922 {
 923         struct dlm_comm *cm = get_comm(nodeid);
 924         if (!cm)
 925                 return -EEXIST;
 926         *seq = cm->seq;
 927         put_comm(cm);
 928         return 0;
 929 }
 930
 931 int dlm_our_nodeid(void)
 932 {
 933         return local_comm ? local_comm->nodeid : 0;
 934 }
 935
 936 /* num 0 is first addr, num 1 is second addr */
 937 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 938 {
 939         if (!local_comm)
 940                 return -1;
 941         if (num + 1 > local_comm->addr_count)
 942                 return -1;
 943         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 944         return 0;
 945 }
 946
 947 /* Config file defaults */
 948 #define DEFAULT_TCP_PORT       21064
 949 #define DEFAULT_RSBTBL_SIZE     1024
 950 #define DEFAULT_RECOVER_TIMER      5
 951 #define DEFAULT_TOSS_SECS         10
 952 #define DEFAULT_SCAN_SECS          5
 953 #define DEFAULT_LOG_DEBUG          0
 954 #define DEFAULT_LOG_INFO           1
 955 #define DEFAULT_PROTOCOL           DLM_PROTO_TCP
 956 #define DEFAULT_MARK               0
 957 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 958 #define DEFAULT_WAITWARN_US        0
 959 #define DEFAULT_NEW_RSB_COUNT    128
 960 #define DEFAULT_RECOVER_CALLBACKS  0
 961 #define DEFAULT_CLUSTER_NAME      ""
 962
 963 struct dlm_config_info dlm_config = {
 964         .ci_tcp_port = DEFAULT_TCP_PORT,
 965         .ci_buffer_size = DLM_MAX_SOCKET_BUFSIZE,
 966         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 967         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 968         .ci_toss_secs = DEFAULT_TOSS_SECS,
 969         .ci_scan_secs = DEFAULT_SCAN_SECS,
 970         .ci_log_debug = DEFAULT_LOG_DEBUG,
 971         .ci_log_info = DEFAULT_LOG_INFO,
 972         .ci_protocol = DEFAULT_PROTOCOL,
 973         .ci_mark = DEFAULT_MARK,
 974         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 975         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 976         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 977         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 978         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 979 };
 980