1/****************************************************************************** 2******************************************************************************* 3** 4** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 5** Copyright (C) 2004-2008 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 <net/ipv6.h> 21#include <net/sock.h> 22 23#include "config.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 32 * The <cluster> level is useless, but I haven't figured out how to avoid it. 33 */ 34 35static struct config_group *space_list; 36static struct config_group *comm_list; 37static struct dlm_comm *local_comm; 38 39struct dlm_clusters; 40struct dlm_cluster; 41struct dlm_spaces; 42struct dlm_space; 43struct dlm_comms; 44struct dlm_comm; 45struct dlm_nodes; 46struct dlm_node; 47 48static struct config_group *make_cluster(struct config_group *, const char *); 49static void drop_cluster(struct config_group *, struct config_item *); 50static void release_cluster(struct config_item *); 51static struct config_group *make_space(struct config_group *, const char *); 52static void drop_space(struct config_group *, struct config_item *); 53static void release_space(struct config_item *); 54static struct config_item *make_comm(struct config_group *, const char *); 55static void drop_comm(struct config_group *, struct config_item *); 56static void release_comm(struct config_item *); 57static struct config_item *make_node(struct config_group *, const char *); 58static void drop_node(struct config_group *, struct config_item *); 59static void release_node(struct config_item *); 60 61static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a, 62 char *buf); 63static ssize_t store_cluster(struct config_item *i, 64 struct configfs_attribute *a, 65 const char *buf, size_t len); 66static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a, 67 char *buf); 68static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a, 69 const char *buf, size_t len); 70static ssize_t show_node(struct config_item *i, struct configfs_attribute *a, 71 char *buf); 72static ssize_t store_node(struct config_item *i, struct configfs_attribute *a, 73 const char *buf, size_t len); 74 75static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf); 76static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf, 77 size_t len); 78static ssize_t comm_local_read(struct dlm_comm *cm, char *buf); 79static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf, 80 size_t len); 81static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, 82 size_t len); 83static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf); 84static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf, 85 size_t len); 86static ssize_t node_weight_read(struct dlm_node *nd, char *buf); 87static ssize_t node_weight_write(struct dlm_node *nd, const char *buf, 88 size_t len); 89 90struct dlm_cluster { 91 struct config_group group; 92 unsigned int cl_tcp_port; 93 unsigned int cl_buffer_size; 94 unsigned int cl_rsbtbl_size; 95 unsigned int cl_lkbtbl_size; 96 unsigned int cl_dirtbl_size; 97 unsigned int cl_recover_timer; 98 unsigned int cl_toss_secs; 99 unsigned int cl_scan_secs; 100 unsigned int cl_log_debug; 101 unsigned int cl_protocol; 102 unsigned int cl_timewarn_cs; 103}; 104 105enum { 106 CLUSTER_ATTR_TCP_PORT = 0, 107 CLUSTER_ATTR_BUFFER_SIZE, 108 CLUSTER_ATTR_RSBTBL_SIZE, 109 CLUSTER_ATTR_LKBTBL_SIZE, 110 CLUSTER_ATTR_DIRTBL_SIZE, 111 CLUSTER_ATTR_RECOVER_TIMER, 112 CLUSTER_ATTR_TOSS_SECS, 113 CLUSTER_ATTR_SCAN_SECS, 114 CLUSTER_ATTR_LOG_DEBUG, 115 CLUSTER_ATTR_PROTOCOL, 116 CLUSTER_ATTR_TIMEWARN_CS, 117}; 118 119struct cluster_attribute { 120 struct configfs_attribute attr; 121 ssize_t (*show)(struct dlm_cluster *, char *); 122 ssize_t (*store)(struct dlm_cluster *, const char *, size_t); 123}; 124 125static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field, 126 int *info_field, int check_zero, 127 const char *buf, size_t len) 128{ 129 unsigned int x; 130 131 if (!capable(CAP_SYS_ADMIN)) 132 return -EACCES; 133 134 x = simple_strtoul(buf, NULL, 0); 135 136 if (check_zero && !x) 137 return -EINVAL; 138 139 *cl_field = x; 140 *info_field = x; 141 142 return len; 143} 144 145#define CLUSTER_ATTR(name, check_zero) \ 146static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \ 147{ \ 148 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \ 149 check_zero, buf, len); \ 150} \ 151static ssize_t name##_read(struct dlm_cluster *cl, char *buf) \ 152{ \ 153 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \ 154} \ 155static struct cluster_attribute cluster_attr_##name = \ 156__CONFIGFS_ATTR(name, 0644, name##_read, name##_write) 157 158CLUSTER_ATTR(tcp_port, 1); 159CLUSTER_ATTR(buffer_size, 1); 160CLUSTER_ATTR(rsbtbl_size, 1); 161CLUSTER_ATTR(lkbtbl_size, 1); 162CLUSTER_ATTR(dirtbl_size, 1); 163CLUSTER_ATTR(recover_timer, 1); 164CLUSTER_ATTR(toss_secs, 1); 165CLUSTER_ATTR(scan_secs, 1); 166CLUSTER_ATTR(log_debug, 0); 167CLUSTER_ATTR(protocol, 0); 168CLUSTER_ATTR(timewarn_cs, 1); 169 170static struct configfs_attribute *cluster_attrs[] = { 171 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr, 172 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr, 173 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr, 174 [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr, 175 [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr, 176 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr, 177 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr, 178 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr, 179 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr, 180 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr, 181 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr, 182 NULL, 183}; 184 185enum { 186 COMM_ATTR_NODEID = 0, 187 COMM_ATTR_LOCAL, 188 COMM_ATTR_ADDR, 189}; 190 191struct comm_attribute { 192 struct configfs_attribute attr; 193 ssize_t (*show)(struct dlm_comm *, char *); 194 ssize_t (*store)(struct dlm_comm *, const char *, size_t); 195}; 196 197static struct comm_attribute comm_attr_nodeid = { 198 .attr = { .ca_owner = THIS_MODULE, 199 .ca_name = "nodeid", 200 .ca_mode = S_IRUGO | S_IWUSR }, 201 .show = comm_nodeid_read, 202 .store = comm_nodeid_write, 203}; 204 205static struct comm_attribute comm_attr_local = { 206 .attr = { .ca_owner = THIS_MODULE, 207 .ca_name = "local", 208 .ca_mode = S_IRUGO | S_IWUSR }, 209 .show = comm_local_read, 210 .store = comm_local_write, 211}; 212 213static struct comm_attribute comm_attr_addr = { 214 .attr = { .ca_owner = THIS_MODULE, 215 .ca_name = "addr", 216 .ca_mode = S_IRUGO | S_IWUSR }, 217 .store = comm_addr_write, 218}; 219 220static struct configfs_attribute *comm_attrs[] = { 221 [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr, 222 [COMM_ATTR_LOCAL] = &comm_attr_local.attr, 223 [COMM_ATTR_ADDR] = &comm_attr_addr.attr, 224 NULL, 225}; 226 227enum { 228 NODE_ATTR_NODEID = 0, 229 NODE_ATTR_WEIGHT, 230}; 231 232struct node_attribute { 233 struct configfs_attribute attr; 234 ssize_t (*show)(struct dlm_node *, char *); 235 ssize_t (*store)(struct dlm_node *, const char *, size_t); 236}; 237 238static struct node_attribute node_attr_nodeid = { 239 .attr = { .ca_owner = THIS_MODULE, 240 .ca_name = "nodeid", 241 .ca_mode = S_IRUGO | S_IWUSR }, 242 .show = node_nodeid_read, 243 .store = node_nodeid_write, 244}; 245 246static struct node_attribute node_attr_weight = { 247 .attr = { .ca_owner = THIS_MODULE, 248 .ca_name = "weight", 249 .ca_mode = S_IRUGO | S_IWUSR }, 250 .show = node_weight_read, 251 .store = node_weight_write, 252}; 253 254static struct configfs_attribute *node_attrs[] = { 255 [NODE_ATTR_NODEID] = &node_attr_nodeid.attr, 256 [NODE_ATTR_WEIGHT] = &node_attr_weight.attr, 257 NULL, 258}; 259 260struct dlm_clusters { 261 struct configfs_subsystem subsys; 262}; 263 264struct dlm_spaces { 265 struct config_group ss_group; 266}; 267 268struct dlm_space { 269 struct config_group group; 270 struct list_head members; 271 struct mutex members_lock; 272 int members_count; 273}; 274 275struct dlm_comms { 276 struct config_group cs_group; 277}; 278 279struct dlm_comm { 280 struct config_item item; 281 int nodeid; 282 int local; 283 int addr_count; 284 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; 285}; 286 287struct dlm_nodes { 288 struct config_group ns_group; 289}; 290 291struct dlm_node { 292 struct config_item item; 293 struct list_head list; /* space->members */ 294 int nodeid; 295 int weight; 296 int new; 297}; 298 299static struct configfs_group_operations clusters_ops = { 300 .make_group = make_cluster, 301 .drop_item = drop_cluster, 302}; 303 304static struct configfs_item_operations cluster_ops = { 305 .release = release_cluster, 306 .show_attribute = show_cluster, 307 .store_attribute = store_cluster, 308}; 309 310static struct configfs_group_operations spaces_ops = { 311 .make_group = make_space, 312 .drop_item = drop_space, 313}; 314 315static struct configfs_item_operations space_ops = { 316 .release = release_space, 317}; 318 319static struct configfs_group_operations comms_ops = { 320 .make_item = make_comm, 321 .drop_item = drop_comm, 322}; 323 324static struct configfs_item_operations comm_ops = { 325 .release = release_comm, 326 .show_attribute = show_comm, 327 .store_attribute = store_comm, 328}; 329 330static struct configfs_group_operations nodes_ops = { 331 .make_item = make_node, 332 .drop_item = drop_node, 333}; 334 335static struct configfs_item_operations node_ops = { 336 .release = release_node, 337 .show_attribute = show_node, 338 .store_attribute = store_node, 339}; 340 341static struct config_item_type clusters_type = { 342 .ct_group_ops = &clusters_ops, 343 .ct_owner = THIS_MODULE, 344}; 345 346static struct config_item_type cluster_type = { 347 .ct_item_ops = &cluster_ops, 348 .ct_attrs = cluster_attrs, 349 .ct_owner = THIS_MODULE, 350}; 351 352static struct config_item_type spaces_type = { 353 .ct_group_ops = &spaces_ops, 354 .ct_owner = THIS_MODULE, 355}; 356 357static struct config_item_type space_type = { 358 .ct_item_ops = &space_ops, 359 .ct_owner = THIS_MODULE, 360}; 361 362static struct config_item_type comms_type = { 363 .ct_group_ops = &comms_ops, 364 .ct_owner = THIS_MODULE, 365}; 366 367static struct config_item_type comm_type = { 368 .ct_item_ops = &comm_ops, 369 .ct_attrs = comm_attrs, 370 .ct_owner = THIS_MODULE, 371}; 372 373static struct config_item_type nodes_type = { 374 .ct_group_ops = &nodes_ops, 375 .ct_owner = THIS_MODULE, 376}; 377 378static struct config_item_type node_type = { 379 .ct_item_ops = &node_ops, 380 .ct_attrs = node_attrs, 381 .ct_owner = THIS_MODULE, 382}; 383 384static struct dlm_cluster *config_item_to_cluster(struct config_item *i) 385{ 386 return i ? container_of(to_config_group(i), struct dlm_cluster, group) : 387 NULL; 388} 389 390static struct dlm_space *config_item_to_space(struct config_item *i) 391{ 392 return i ? container_of(to_config_group(i), struct dlm_space, group) : 393 NULL; 394} 395 396static struct dlm_comm *config_item_to_comm(struct config_item *i) 397{ 398 return i ? container_of(i, struct dlm_comm, item) : NULL; 399} 400 401static struct dlm_node *config_item_to_node(struct config_item *i) 402{ 403 return i ? container_of(i, struct dlm_node, item) : NULL; 404} 405 406static struct config_group *make_cluster(struct config_group *g, 407 const char *name) 408{ 409 struct dlm_cluster *cl = NULL; 410 struct dlm_spaces *sps = NULL; 411 struct dlm_comms *cms = NULL; 412 void *gps = NULL; 413 414 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS); 415 gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS); 416 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS); 417 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS); 418 419 if (!cl || !gps || !sps || !cms) 420 goto fail; 421 422 config_group_init_type_name(&cl->group, name, &cluster_type); 423 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type); 424 config_group_init_type_name(&cms->cs_group, "comms", &comms_type); 425 426 cl->group.default_groups = gps; 427 cl->group.default_groups[0] = &sps->ss_group; 428 cl->group.default_groups[1] = &cms->cs_group; 429 cl->group.default_groups[2] = NULL; 430 431 cl->cl_tcp_port = dlm_config.ci_tcp_port; 432 cl->cl_buffer_size = dlm_config.ci_buffer_size; 433 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size; 434 cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size; 435 cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size; 436 cl->cl_recover_timer = dlm_config.ci_recover_timer; 437 cl->cl_toss_secs = dlm_config.ci_toss_secs; 438 cl->cl_scan_secs = dlm_config.ci_scan_secs; 439 cl->cl_log_debug = dlm_config.ci_log_debug; 440 cl->cl_protocol = dlm_config.ci_protocol; 441 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs; 442 443 space_list = &sps->ss_group; 444 comm_list = &cms->cs_group; 445 return &cl->group; 446 447 fail: 448 kfree(cl); 449 kfree(gps); 450 kfree(sps); 451 kfree(cms); 452 return ERR_PTR(-ENOMEM); 453} 454 455static void drop_cluster(struct config_group *g, struct config_item *i) 456{ 457 struct dlm_cluster *cl = config_item_to_cluster(i); 458 struct config_item *tmp; 459 int j; 460 461 for (j = 0; cl->group.default_groups[j]; j++) { 462 tmp = &cl->group.default_groups[j]->cg_item; 463 cl->group.default_groups[j] = NULL; 464 config_item_put(tmp); 465 } 466 467 space_list = NULL; 468 comm_list = NULL; 469 470 config_item_put(i); 471} 472 473static void release_cluster(struct config_item *i) 474{ 475 struct dlm_cluster *cl = config_item_to_cluster(i); 476 kfree(cl->group.default_groups); 477 kfree(cl); 478} 479 480static struct config_group *make_space(struct config_group *g, const char *name) 481{ 482 struct dlm_space *sp = NULL; 483 struct dlm_nodes *nds = NULL; 484 void *gps = NULL; 485 486 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS); 487 gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS); 488 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS); 489 490 if (!sp || !gps || !nds) 491 goto fail; 492 493 config_group_init_type_name(&sp->group, name, &space_type); 494 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type); 495 496 sp->group.default_groups = gps; 497 sp->group.default_groups[0] = &nds->ns_group; 498 sp->group.default_groups[1] = NULL; 499 500 INIT_LIST_HEAD(&sp->members); 501 mutex_init(&sp->members_lock); 502 sp->members_count = 0; 503 return &sp->group; 504 505 fail: 506 kfree(sp); 507 kfree(gps); 508 kfree(nds); 509 return ERR_PTR(-ENOMEM); 510} 511 512static void drop_space(struct config_group *g, struct config_item *i) 513{ 514 struct dlm_space *sp = config_item_to_space(i); 515 struct config_item *tmp; 516 int j; 517 518 /* assert list_empty(&sp->members) */ 519 520 for (j = 0; sp->group.default_groups[j]; j++) { 521 tmp = &sp->group.default_groups[j]->cg_item; 522 sp->group.default_groups[j] = NULL; 523 config_item_put(tmp); 524 } 525 526 config_item_put(i); 527} 528 529static void release_space(struct config_item *i) 530{ 531 struct dlm_space *sp = config_item_to_space(i); 532 kfree(sp->group.default_groups); 533 kfree(sp); 534} 535 536static struct config_item *make_comm(struct config_group *g, const char *name) 537{ 538 struct dlm_comm *cm; 539 540 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS); 541 if (!cm) 542 return ERR_PTR(-ENOMEM); 543 544 config_item_init_type_name(&cm->item, name, &comm_type); 545 cm->nodeid = -1; 546 cm->local = 0; 547 cm->addr_count = 0; 548 return &cm->item; 549} 550 551static void drop_comm(struct config_group *g, struct config_item *i) 552{ 553 struct dlm_comm *cm = config_item_to_comm(i); 554 if (local_comm == cm) 555 local_comm = NULL; 556 dlm_lowcomms_close(cm->nodeid); 557 while (cm->addr_count--) 558 kfree(cm->addr[cm->addr_count]); 559 config_item_put(i); 560} 561 562static void release_comm(struct config_item *i) 563{ 564 struct dlm_comm *cm = config_item_to_comm(i); 565 kfree(cm); 566} 567 568static struct config_item *make_node(struct config_group *g, const char *name) 569{ 570 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent); 571 struct dlm_node *nd; 572 573 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS); 574 if (!nd) 575 return ERR_PTR(-ENOMEM); 576 577 config_item_init_type_name(&nd->item, name, &node_type); 578 nd->nodeid = -1; 579 nd->weight = 1; /* default weight of 1 if none is set */ 580 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */ 581 582 mutex_lock(&sp->members_lock); 583 list_add(&nd->list, &sp->members); 584 sp->members_count++; 585 mutex_unlock(&sp->members_lock); 586 587 return &nd->item; 588} 589 590static void drop_node(struct config_group *g, struct config_item *i) 591{ 592 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent); 593 struct dlm_node *nd = config_item_to_node(i); 594 595 mutex_lock(&sp->members_lock); 596 list_del(&nd->list); 597 sp->members_count--; 598 mutex_unlock(&sp->members_lock); 599 600 config_item_put(i); 601} 602 603static void release_node(struct config_item *i) 604{ 605 struct dlm_node *nd = config_item_to_node(i); 606 kfree(nd); 607} 608 609static struct dlm_clusters clusters_root = { 610 .subsys = { 611 .su_group = { 612 .cg_item = { 613 .ci_namebuf = "dlm", 614 .ci_type = &clusters_type, 615 }, 616 }, 617 }, 618}; 619 620int __init dlm_config_init(void) 621{ 622 config_group_init(&clusters_root.subsys.su_group); 623 mutex_init(&clusters_root.subsys.su_mutex); 624 return configfs_register_subsystem(&clusters_root.subsys); 625} 626 627void dlm_config_exit(void) 628{ 629 configfs_unregister_subsystem(&clusters_root.subsys); 630} 631 632/* 633 * Functions for user space to read/write attributes 634 */ 635 636static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a, 637 char *buf) 638{ 639 struct dlm_cluster *cl = config_item_to_cluster(i); 640 struct cluster_attribute *cla = 641 container_of(a, struct cluster_attribute, attr); 642 return cla->show ? cla->show(cl, buf) : 0; 643} 644 645static ssize_t store_cluster(struct config_item *i, 646 struct configfs_attribute *a, 647 const char *buf, size_t len) 648{ 649 struct dlm_cluster *cl = config_item_to_cluster(i); 650 struct cluster_attribute *cla = 651 container_of(a, struct cluster_attribute, attr); 652 return cla->store ? cla->store(cl, buf, len) : -EINVAL; 653} 654 655static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a, 656 char *buf) 657{ 658 struct dlm_comm *cm = config_item_to_comm(i); 659 struct comm_attribute *cma = 660 container_of(a, struct comm_attribute, attr); 661 return cma->show ? cma->show(cm, buf) : 0; 662} 663 664static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a, 665 const char *buf, size_t len) 666{ 667 struct dlm_comm *cm = config_item_to_comm(i); 668 struct comm_attribute *cma = 669 container_of(a, struct comm_attribute, attr); 670 return cma->store ? cma->store(cm, buf, len) : -EINVAL; 671} 672 673static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf) 674{ 675 return sprintf(buf, "%d\n", cm->nodeid); 676} 677 678static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf, 679 size_t len) 680{ 681 cm->nodeid = simple_strtol(buf, NULL, 0); 682 return len; 683} 684 685static ssize_t comm_local_read(struct dlm_comm *cm, char *buf) 686{ 687 return sprintf(buf, "%d\n", cm->local); 688} 689 690static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf, 691 size_t len) 692{ 693 cm->local= simple_strtol(buf, NULL, 0); 694 if (cm->local && !local_comm) 695 local_comm = cm; 696 return len; 697} 698 699static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len) 700{ 701 struct sockaddr_storage *addr; 702 703 if (len != sizeof(struct sockaddr_storage)) 704 return -EINVAL; 705 706 if (cm->addr_count >= DLM_MAX_ADDR_COUNT) 707 return -ENOSPC; 708 709 addr = kzalloc(sizeof(*addr), GFP_NOFS); 710 if (!addr) 711 return -ENOMEM; 712 713 memcpy(addr, buf, len); 714 cm->addr[cm->addr_count++] = addr; 715 return len; 716} 717 718static ssize_t show_node(struct config_item *i, struct configfs_attribute *a, 719 char *buf) 720{ 721 struct dlm_node *nd = config_item_to_node(i); 722 struct node_attribute *nda = 723 container_of(a, struct node_attribute, attr); 724 return nda->show ? nda->show(nd, buf) : 0; 725} 726 727static ssize_t store_node(struct config_item *i, struct configfs_attribute *a, 728 const char *buf, size_t len) 729{ 730 struct dlm_node *nd = config_item_to_node(i); 731 struct node_attribute *nda = 732 container_of(a, struct node_attribute, attr); 733 return nda->store ? nda->store(nd, buf, len) : -EINVAL; 734} 735 736static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf) 737{ 738 return sprintf(buf, "%d\n", nd->nodeid); 739} 740 741static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf, 742 size_t len) 743{ 744 nd->nodeid = simple_strtol(buf, NULL, 0); 745 return len; 746} 747 748static ssize_t node_weight_read(struct dlm_node *nd, char *buf) 749{ 750 return sprintf(buf, "%d\n", nd->weight); 751} 752 753static ssize_t node_weight_write(struct dlm_node *nd, const char *buf, 754 size_t len) 755{ 756 nd->weight = simple_strtol(buf, NULL, 0); 757 return len; 758} 759 760/* 761 * Functions for the dlm to get the info that's been configured 762 */ 763 764static struct dlm_space *get_space(char *name) 765{ 766 struct config_item *i; 767 768 if (!space_list) 769 return NULL; 770 771 mutex_lock(&space_list->cg_subsys->su_mutex); 772 i = config_group_find_item(space_list, name); 773 mutex_unlock(&space_list->cg_subsys->su_mutex); 774 775 return config_item_to_space(i); 776} 777 778static void put_space(struct dlm_space *sp) 779{ 780 config_item_put(&sp->group.cg_item); 781} 782 783static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y) 784{ 785 switch (x->ss_family) { 786 case AF_INET: { 787 struct sockaddr_in *sinx = (struct sockaddr_in *)x; 788 struct sockaddr_in *siny = (struct sockaddr_in *)y; 789 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) 790 return 0; 791 if (sinx->sin_port != siny->sin_port) 792 return 0; 793 break; 794 } 795 case AF_INET6: { 796 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; 797 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; 798 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) 799 return 0; 800 if (sinx->sin6_port != siny->sin6_port) 801 return 0; 802 break; 803 } 804 default: 805 return 0; 806 } 807 return 1; 808} 809 810static struct dlm_comm *get_comm(int nodeid, struct sockaddr_storage *addr) 811{ 812 struct config_item *i; 813 struct dlm_comm *cm = NULL; 814 int found = 0; 815 816 if (!comm_list) 817 return NULL; 818 819 mutex_lock(&clusters_root.subsys.su_mutex); 820 821 list_for_each_entry(i, &comm_list->cg_children, ci_entry) { 822 cm = config_item_to_comm(i); 823 824 if (nodeid) { 825 if (cm->nodeid != nodeid) 826 continue; 827 found = 1; 828 config_item_get(i); 829 break; 830 } else { 831 if (!cm->addr_count || !addr_compare(cm->addr[0], addr)) 832 continue; 833 found = 1; 834 config_item_get(i); 835 break; 836 } 837 } 838 mutex_unlock(&clusters_root.subsys.su_mutex); 839 840 if (!found) 841 cm = NULL; 842 return cm; 843} 844 845static void put_comm(struct dlm_comm *cm) 846{ 847 config_item_put(&cm->item); 848} 849 850/* caller must free mem */ 851int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out, 852 int **new_out, int *new_count_out) 853{ 854 struct dlm_space *sp; 855 struct dlm_node *nd; 856 int i = 0, rv = 0, ids_count = 0, new_count = 0; 857 int *ids, *new; 858 859 sp = get_space(lsname); 860 if (!sp) 861 return -EEXIST; 862 863 mutex_lock(&sp->members_lock); 864 if (!sp->members_count) { 865 rv = -EINVAL; 866 printk(KERN_ERR "dlm: zero members_count\n"); 867 goto out; 868 } 869 870 ids_count = sp->members_count; 871 872 ids = kcalloc(ids_count, sizeof(int), GFP_NOFS); 873 if (!ids) { 874 rv = -ENOMEM; 875 goto out; 876 } 877 878 list_for_each_entry(nd, &sp->members, list) { 879 ids[i++] = nd->nodeid; 880 if (nd->new) 881 new_count++; 882 } 883 884 if (ids_count != i) 885 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i); 886 887 if (!new_count) 888 goto out_ids; 889 890 new = kcalloc(new_count, sizeof(int), GFP_NOFS); 891 if (!new) { 892 kfree(ids); 893 rv = -ENOMEM; 894 goto out; 895 } 896 897 i = 0; 898 list_for_each_entry(nd, &sp->members, list) { 899 if (nd->new) { 900 new[i++] = nd->nodeid; 901 nd->new = 0; 902 } 903 } 904 *new_count_out = new_count; 905 *new_out = new; 906 907 out_ids: 908 *ids_count_out = ids_count; 909 *ids_out = ids; 910 out: 911 mutex_unlock(&sp->members_lock); 912 put_space(sp); 913 return rv; 914} 915 916int dlm_node_weight(char *lsname, int nodeid) 917{ 918 struct dlm_space *sp; 919 struct dlm_node *nd; 920 int w = -EEXIST; 921 922 sp = get_space(lsname); 923 if (!sp) 924 goto out; 925 926 mutex_lock(&sp->members_lock); 927 list_for_each_entry(nd, &sp->members, list) { 928 if (nd->nodeid != nodeid) 929 continue; 930 w = nd->weight; 931 break; 932 } 933 mutex_unlock(&sp->members_lock); 934 put_space(sp); 935 out: 936 return w; 937} 938 939int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr) 940{ 941 struct dlm_comm *cm = get_comm(nodeid, NULL); 942 if (!cm) 943 return -EEXIST; 944 if (!cm->addr_count) 945 return -ENOENT; 946 memcpy(addr, cm->addr[0], sizeof(*addr)); 947 put_comm(cm); 948 return 0; 949} 950 951int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) 952{ 953 struct dlm_comm *cm = get_comm(0, addr); 954 if (!cm) 955 return -EEXIST; 956 *nodeid = cm->nodeid; 957 put_comm(cm); 958 return 0; 959} 960 961int dlm_our_nodeid(void) 962{ 963 return local_comm ? local_comm->nodeid : 0; 964} 965 966/* num 0 is first addr, num 1 is second addr */ 967int dlm_our_addr(struct sockaddr_storage *addr, int num) 968{ 969 if (!local_comm) 970 return -1; 971 if (num + 1 > local_comm->addr_count) 972 return -1; 973 memcpy(addr, local_comm->addr[num], sizeof(*addr)); 974 return 0; 975} 976 977/* Config file defaults */ 978#define DEFAULT_TCP_PORT 21064 979#define DEFAULT_BUFFER_SIZE 4096 980#define DEFAULT_RSBTBL_SIZE 256 981#define DEFAULT_LKBTBL_SIZE 1024 982#define DEFAULT_DIRTBL_SIZE 512 983#define DEFAULT_RECOVER_TIMER 5 984#define DEFAULT_TOSS_SECS 10 985#define DEFAULT_SCAN_SECS 5 986#define DEFAULT_LOG_DEBUG 0 987#define DEFAULT_PROTOCOL 0 988#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */ 989 990struct dlm_config_info dlm_config = { 991 .ci_tcp_port = DEFAULT_TCP_PORT, 992 .ci_buffer_size = DEFAULT_BUFFER_SIZE, 993 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE, 994 .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE, 995 .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE, 996 .ci_recover_timer = DEFAULT_RECOVER_TIMER, 997 .ci_toss_secs = DEFAULT_TOSS_SECS, 998 .ci_scan_secs = DEFAULT_SCAN_SECS, 999 .ci_log_debug = DEFAULT_LOG_DEBUG, 1000 .ci_protocol = DEFAULT_PROTOCOL, 1001 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS 1002}; 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