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