1 /****************************************************************************** 2 ******************************************************************************* 3 ** 4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 5 ** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. 6 ** 7 ** This copyrighted material is made available to anyone wishing to use, 8 ** modify, copy, or redistribute it subject to the terms and conditions 9 ** of the GNU General Public License v.2. 10 ** 11 ******************************************************************************* 12 ******************************************************************************/ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/configfs.h> 17 #include <linux/slab.h> 18 #include <linux/in.h> 19 #include <linux/in6.h> 20 #include <linux/dlmconstants.h> 21 #include <net/ipv6.h> 22 #include <net/sock.h> 23 24 #include "config.h" 25 #include "lowcomms.h" 26 27 /* 28 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid 29 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight 30 * /config/dlm/<cluster>/comms/<comm>/nodeid 31 * /config/dlm/<cluster>/comms/<comm>/local 32 * /config/dlm/<cluster>/comms/<comm>/addr (write only) 33 * /config/dlm/<cluster>/comms/<comm>/addr_list (read only) 34 * The <cluster> level is useless, but I haven't figured out how to avoid it. 35 */ 36 37 static struct config_group *space_list; 38 static struct config_group *comm_list; 39 static struct dlm_comm *local_comm; 40 static uint32_t dlm_comm_count; 41 42 struct dlm_clusters; 43 struct dlm_cluster; 44 struct dlm_spaces; 45 struct dlm_space; 46 struct dlm_comms; 47 struct dlm_comm; 48 struct dlm_nodes; 49 struct dlm_node; 50 51 static struct config_group *make_cluster(struct config_group *, const char *); 52 static void drop_cluster(struct config_group *, struct config_item *); 53 static void release_cluster(struct config_item *); 54 static struct config_group *make_space(struct config_group *, const char *); 55 static void drop_space(struct config_group *, struct config_item *); 56 static void release_space(struct config_item *); 57 static struct config_item *make_comm(struct config_group *, const char *); 58 static void drop_comm(struct config_group *, struct config_item *); 59 static void release_comm(struct config_item *); 60 static struct config_item *make_node(struct config_group *, const char *); 61 static void drop_node(struct config_group *, struct config_item *); 62 static void release_node(struct config_item *); 63 64 static struct configfs_attribute *comm_attrs[]; 65 static struct configfs_attribute *node_attrs[]; 66 67 struct dlm_cluster { 68 struct config_group group; 69 unsigned int cl_tcp_port; 70 unsigned int cl_buffer_size; 71 unsigned int cl_rsbtbl_size; 72 unsigned int cl_recover_timer; 73 unsigned int cl_toss_secs; 74 unsigned int cl_scan_secs; 75 unsigned int cl_log_debug; 76 unsigned int cl_protocol; 77 unsigned int cl_timewarn_cs; 78 unsigned int cl_waitwarn_us; 79 unsigned int cl_new_rsb_count; 80 unsigned int cl_recover_callbacks; 81 char cl_cluster_name[DLM_LOCKSPACE_LEN]; 82 }; 83 84 static struct dlm_cluster *config_item_to_cluster(struct config_item *i) 85 { 86 return i ? container_of(to_config_group(i), struct dlm_cluster, group) : 87 NULL; 88 } 89 90 enum { 91 CLUSTER_ATTR_TCP_PORT = 0, 92 CLUSTER_ATTR_BUFFER_SIZE, 93 CLUSTER_ATTR_RSBTBL_SIZE, 94 CLUSTER_ATTR_RECOVER_TIMER, 95 CLUSTER_ATTR_TOSS_SECS, 96 CLUSTER_ATTR_SCAN_SECS, 97 CLUSTER_ATTR_LOG_DEBUG, 98 CLUSTER_ATTR_PROTOCOL, 99 CLUSTER_ATTR_TIMEWARN_CS, 100 CLUSTER_ATTR_WAITWARN_US, 101 CLUSTER_ATTR_NEW_RSB_COUNT, 102 CLUSTER_ATTR_RECOVER_CALLBACKS, 103 CLUSTER_ATTR_CLUSTER_NAME, 104 }; 105 106 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf) 107 { 108 struct dlm_cluster *cl = config_item_to_cluster(item); 109 return sprintf(buf, "%s\n", cl->cl_cluster_name); 110 } 111 112 static ssize_t cluster_cluster_name_store(struct config_item *item, 113 const char *buf, size_t len) 114 { 115 struct dlm_cluster *cl = config_item_to_cluster(item); 116 117 strlcpy(dlm_config.ci_cluster_name, buf, 118 sizeof(dlm_config.ci_cluster_name)); 119 strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name)); 120 return len; 121 } 122 123 CONFIGFS_ATTR(cluster_, cluster_name); 124 125 static 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 int rc; 131 132 if (!capable(CAP_SYS_ADMIN)) 133 return -EPERM; 134 rc = kstrtouint(buf, 0, &x); 135 if (rc) 136 return rc; 137 138 if (check_zero && !x) 139 return -EINVAL; 140 141 *cl_field = x; 142 *info_field = x; 143 144 return len; 145 } 146 147 #define CLUSTER_ATTR(name, check_zero) \ 148 static ssize_t cluster_##name##_store(struct config_item *item, \ 149 const char *buf, size_t len) \ 150 { \ 151 struct dlm_cluster *cl = config_item_to_cluster(item); \ 152 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \ 153 check_zero, buf, len); \ 154 } \ 155 static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \ 156 { \ 157 struct dlm_cluster *cl = config_item_to_cluster(item); \ 158 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \ 159 } \ 160 CONFIGFS_ATTR(cluster_, name); 161 162 CLUSTER_ATTR(tcp_port, 1); 163 CLUSTER_ATTR(buffer_size, 1); 164 CLUSTER_ATTR(rsbtbl_size, 1); 165 CLUSTER_ATTR(recover_timer, 1); 166 CLUSTER_ATTR(toss_secs, 1); 167 CLUSTER_ATTR(scan_secs, 1); 168 CLUSTER_ATTR(log_debug, 0); 169 CLUSTER_ATTR(protocol, 0); 170 CLUSTER_ATTR(timewarn_cs, 1); 171 CLUSTER_ATTR(waitwarn_us, 0); 172 CLUSTER_ATTR(new_rsb_count, 0); 173 CLUSTER_ATTR(recover_callbacks, 0); 174 175 static struct configfs_attribute *cluster_attrs[] = { 176 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port, 177 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size, 178 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size, 179 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer, 180 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs, 181 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs, 182 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug, 183 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol, 184 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs, 185 [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us, 186 [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count, 187 [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks, 188 [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name, 189 NULL, 190 }; 191 192 enum { 193 COMM_ATTR_NODEID = 0, 194 COMM_ATTR_LOCAL, 195 COMM_ATTR_ADDR, 196 COMM_ATTR_ADDR_LIST, 197 }; 198 199 enum { 200 NODE_ATTR_NODEID = 0, 201 NODE_ATTR_WEIGHT, 202 }; 203 204 struct dlm_clusters { 205 struct configfs_subsystem subsys; 206 }; 207 208 struct dlm_spaces { 209 struct config_group ss_group; 210 }; 211 212 struct dlm_space { 213 struct config_group group; 214 struct list_head members; 215 struct mutex members_lock; 216 int members_count; 217 }; 218 219 struct dlm_comms { 220 struct config_group cs_group; 221 }; 222 223 struct dlm_comm { 224 struct config_item item; 225 int seq; 226 int nodeid; 227 int local; 228 int addr_count; 229 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; 230 }; 231 232 struct dlm_nodes { 233 struct config_group ns_group; 234 }; 235 236 struct dlm_node { 237 struct config_item item; 238 struct list_head list; /* space->members */ 239 int nodeid; 240 int weight; 241 int new; 242 int comm_seq; /* copy of cm->seq when nd->nodeid is set */ 243 }; 244 245 static struct configfs_group_operations clusters_ops = { 246 .make_group = make_cluster, 247 .drop_item = drop_cluster, 248 }; 249 250 static struct configfs_item_operations cluster_ops = { 251 .release = release_cluster, 252 }; 253 254 static struct configfs_group_operations spaces_ops = { 255 .make_group = make_space, 256 .drop_item = drop_space, 257 }; 258 259 static struct configfs_item_operations space_ops = { 260 .release = release_space, 261 }; 262 263 static struct configfs_group_operations comms_ops = { 264 .make_item = make_comm, 265 .drop_item = drop_comm, 266 }; 267 268 static struct configfs_item_operations comm_ops = { 269 .release = release_comm, 270 }; 271 272 static struct configfs_group_operations nodes_ops = { 273 .make_item = make_node, 274 .drop_item = drop_node, 275 }; 276 277 static struct configfs_item_operations node_ops = { 278 .release = release_node, 279 }; 280 281 static struct config_item_type clusters_type = { 282 .ct_group_ops = &clusters_ops, 283 .ct_owner = THIS_MODULE, 284 }; 285 286 static struct config_item_type cluster_type = { 287 .ct_item_ops = &cluster_ops, 288 .ct_attrs = cluster_attrs, 289 .ct_owner = THIS_MODULE, 290 }; 291 292 static struct config_item_type spaces_type = { 293 .ct_group_ops = &spaces_ops, 294 .ct_owner = THIS_MODULE, 295 }; 296 297 static struct config_item_type space_type = { 298 .ct_item_ops = &space_ops, 299 .ct_owner = THIS_MODULE, 300 }; 301 302 static struct config_item_type comms_type = { 303 .ct_group_ops = &comms_ops, 304 .ct_owner = THIS_MODULE, 305 }; 306 307 static struct config_item_type comm_type = { 308 .ct_item_ops = &comm_ops, 309 .ct_attrs = comm_attrs, 310 .ct_owner = THIS_MODULE, 311 }; 312 313 static struct config_item_type nodes_type = { 314 .ct_group_ops = &nodes_ops, 315 .ct_owner = THIS_MODULE, 316 }; 317 318 static struct config_item_type node_type = { 319 .ct_item_ops = &node_ops, 320 .ct_attrs = node_attrs, 321 .ct_owner = THIS_MODULE, 322 }; 323 324 static struct dlm_space *config_item_to_space(struct config_item *i) 325 { 326 return i ? container_of(to_config_group(i), struct dlm_space, group) : 327 NULL; 328 } 329 330 static struct dlm_comm *config_item_to_comm(struct config_item *i) 331 { 332 return i ? container_of(i, struct dlm_comm, item) : NULL; 333 } 334 335 static struct dlm_node *config_item_to_node(struct config_item *i) 336 { 337 return i ? container_of(i, struct dlm_node, item) : NULL; 338 } 339 340 static struct config_group *make_cluster(struct config_group *g, 341 const char *name) 342 { 343 struct dlm_cluster *cl = NULL; 344 struct dlm_spaces *sps = NULL; 345 struct dlm_comms *cms = NULL; 346 347 cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS); 348 sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS); 349 cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS); 350 351 if (!cl || !sps || !cms) 352 goto fail; 353 354 config_group_init_type_name(&cl->group, name, &cluster_type); 355 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type); 356 config_group_init_type_name(&cms->cs_group, "comms", &comms_type); 357 358 configfs_add_default_group(&sps->ss_group, &cl->group); 359 configfs_add_default_group(&cms->cs_group, &cl->group); 360 361 cl->cl_tcp_port = dlm_config.ci_tcp_port; 362 cl->cl_buffer_size = dlm_config.ci_buffer_size; 363 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size; 364 cl->cl_recover_timer = dlm_config.ci_recover_timer; 365 cl->cl_toss_secs = dlm_config.ci_toss_secs; 366 cl->cl_scan_secs = dlm_config.ci_scan_secs; 367 cl->cl_log_debug = dlm_config.ci_log_debug; 368 cl->cl_protocol = dlm_config.ci_protocol; 369 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs; 370 cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us; 371 cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count; 372 cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks; 373 memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name, 374 DLM_LOCKSPACE_LEN); 375 376 space_list = &sps->ss_group; 377 comm_list = &cms->cs_group; 378 return &cl->group; 379 380 fail: 381 kfree(cl); 382 kfree(sps); 383 kfree(cms); 384 return ERR_PTR(-ENOMEM); 385 } 386 387 static void drop_cluster(struct config_group *g, struct config_item *i) 388 { 389 struct dlm_cluster *cl = config_item_to_cluster(i); 390 391 configfs_remove_default_groups(&cl->group); 392 393 space_list = NULL; 394 comm_list = NULL; 395 396 config_item_put(i); 397 } 398 399 static void release_cluster(struct config_item *i) 400 { 401 struct dlm_cluster *cl = config_item_to_cluster(i); 402 kfree(cl); 403 } 404 405 static struct config_group *make_space(struct config_group *g, const char *name) 406 { 407 struct dlm_space *sp = NULL; 408 struct dlm_nodes *nds = NULL; 409 410 sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS); 411 nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS); 412 413 if (!sp || !nds) 414 goto fail; 415 416 config_group_init_type_name(&sp->group, name, &space_type); 417 418 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type); 419 configfs_add_default_group(&nds->ns_group, &sp->group); 420 421 INIT_LIST_HEAD(&sp->members); 422 mutex_init(&sp->members_lock); 423 sp->members_count = 0; 424 return &sp->group; 425 426 fail: 427 kfree(sp); 428 kfree(nds); 429 return ERR_PTR(-ENOMEM); 430 } 431 432 static void drop_space(struct config_group *g, struct config_item *i) 433 { 434 struct dlm_space *sp = config_item_to_space(i); 435 436 /* assert list_empty(&sp->members) */ 437 438 configfs_remove_default_groups(&sp->group); 439 config_item_put(i); 440 } 441 442 static void release_space(struct config_item *i) 443 { 444 struct dlm_space *sp = config_item_to_space(i); 445 kfree(sp); 446 } 447 448 static struct config_item *make_comm(struct config_group *g, const char *name) 449 { 450 struct dlm_comm *cm; 451 452 cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS); 453 if (!cm) 454 return ERR_PTR(-ENOMEM); 455 456 config_item_init_type_name(&cm->item, name, &comm_type); 457 458 cm->seq = dlm_comm_count++; 459 if (!cm->seq) 460 cm->seq = dlm_comm_count++; 461 462 cm->nodeid = -1; 463 cm->local = 0; 464 cm->addr_count = 0; 465 return &cm->item; 466 } 467 468 static void drop_comm(struct config_group *g, struct config_item *i) 469 { 470 struct dlm_comm *cm = config_item_to_comm(i); 471 if (local_comm == cm) 472 local_comm = NULL; 473 dlm_lowcomms_close(cm->nodeid); 474 while (cm->addr_count--) 475 kfree(cm->addr[cm->addr_count]); 476 config_item_put(i); 477 } 478 479 static void release_comm(struct config_item *i) 480 { 481 struct dlm_comm *cm = config_item_to_comm(i); 482 kfree(cm); 483 } 484 485 static struct config_item *make_node(struct config_group *g, const char *name) 486 { 487 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent); 488 struct dlm_node *nd; 489 490 nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS); 491 if (!nd) 492 return ERR_PTR(-ENOMEM); 493 494 config_item_init_type_name(&nd->item, name, &node_type); 495 nd->nodeid = -1; 496 nd->weight = 1; /* default weight of 1 if none is set */ 497 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */ 498 499 mutex_lock(&sp->members_lock); 500 list_add(&nd->list, &sp->members); 501 sp->members_count++; 502 mutex_unlock(&sp->members_lock); 503 504 return &nd->item; 505 } 506 507 static void drop_node(struct config_group *g, struct config_item *i) 508 { 509 struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent); 510 struct dlm_node *nd = config_item_to_node(i); 511 512 mutex_lock(&sp->members_lock); 513 list_del(&nd->list); 514 sp->members_count--; 515 mutex_unlock(&sp->members_lock); 516 517 config_item_put(i); 518 } 519 520 static void release_node(struct config_item *i) 521 { 522 struct dlm_node *nd = config_item_to_node(i); 523 kfree(nd); 524 } 525 526 static struct dlm_clusters clusters_root = { 527 .subsys = { 528 .su_group = { 529 .cg_item = { 530 .ci_namebuf = "dlm", 531 .ci_type = &clusters_type, 532 }, 533 }, 534 }, 535 }; 536 537 int __init dlm_config_init(void) 538 { 539 config_group_init(&clusters_root.subsys.su_group); 540 mutex_init(&clusters_root.subsys.su_mutex); 541 return configfs_register_subsystem(&clusters_root.subsys); 542 } 543 544 void dlm_config_exit(void) 545 { 546 configfs_unregister_subsystem(&clusters_root.subsys); 547 } 548 549 /* 550 * Functions for user space to read/write attributes 551 */ 552 553 static ssize_t comm_nodeid_show(struct config_item *item, char *buf) 554 { 555 return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid); 556 } 557 558 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf, 559 size_t len) 560 { 561 int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid); 562 563 if (rc) 564 return rc; 565 return len; 566 } 567 568 static ssize_t comm_local_show(struct config_item *item, char *buf) 569 { 570 return sprintf(buf, "%d\n", config_item_to_comm(item)->local); 571 } 572 573 static ssize_t comm_local_store(struct config_item *item, const char *buf, 574 size_t len) 575 { 576 struct dlm_comm *cm = config_item_to_comm(item); 577 int rc = kstrtoint(buf, 0, &cm->local); 578 579 if (rc) 580 return rc; 581 if (cm->local && !local_comm) 582 local_comm = cm; 583 return len; 584 } 585 586 static ssize_t comm_addr_store(struct config_item *item, const char *buf, 587 size_t len) 588 { 589 struct dlm_comm *cm = config_item_to_comm(item); 590 struct sockaddr_storage *addr; 591 int rv; 592 593 if (len != sizeof(struct sockaddr_storage)) 594 return -EINVAL; 595 596 if (cm->addr_count >= DLM_MAX_ADDR_COUNT) 597 return -ENOSPC; 598 599 addr = kzalloc(sizeof(*addr), GFP_NOFS); 600 if (!addr) 601 return -ENOMEM; 602 603 memcpy(addr, buf, len); 604 605 rv = dlm_lowcomms_addr(cm->nodeid, addr, len); 606 if (rv) { 607 kfree(addr); 608 return rv; 609 } 610 611 cm->addr[cm->addr_count++] = addr; 612 return len; 613 } 614 615 static ssize_t comm_addr_list_show(struct config_item *item, char *buf) 616 { 617 struct dlm_comm *cm = config_item_to_comm(item); 618 ssize_t s; 619 ssize_t allowance; 620 int i; 621 struct sockaddr_storage *addr; 622 struct sockaddr_in *addr_in; 623 struct sockaddr_in6 *addr_in6; 624 625 /* Taken from ip6_addr_string() defined in lib/vsprintf.c */ 626 char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")]; 627 628 629 /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */ 630 allowance = 4096; 631 buf[0] = '\0'; 632 633 for (i = 0; i < cm->addr_count; i++) { 634 addr = cm->addr[i]; 635 636 switch(addr->ss_family) { 637 case AF_INET: 638 addr_in = (struct sockaddr_in *)addr; 639 s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr); 640 break; 641 case AF_INET6: 642 addr_in6 = (struct sockaddr_in6 *)addr; 643 s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr); 644 break; 645 default: 646 s = sprintf(buf0, "%s\n", "<UNKNOWN>"); 647 break; 648 } 649 allowance -= s; 650 if (allowance >= 0) 651 strcat(buf, buf0); 652 else { 653 allowance += s; 654 break; 655 } 656 } 657 return 4096 - allowance; 658 } 659 660 CONFIGFS_ATTR(comm_, nodeid); 661 CONFIGFS_ATTR(comm_, local); 662 CONFIGFS_ATTR_WO(comm_, addr); 663 CONFIGFS_ATTR_RO(comm_, addr_list); 664 665 static struct configfs_attribute *comm_attrs[] = { 666 [COMM_ATTR_NODEID] = &comm_attr_nodeid, 667 [COMM_ATTR_LOCAL] = &comm_attr_local, 668 [COMM_ATTR_ADDR] = &comm_attr_addr, 669 [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list, 670 NULL, 671 }; 672 673 static ssize_t node_nodeid_show(struct config_item *item, char *buf) 674 { 675 return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid); 676 } 677 678 static ssize_t node_nodeid_store(struct config_item *item, const char *buf, 679 size_t len) 680 { 681 struct dlm_node *nd = config_item_to_node(item); 682 uint32_t seq = 0; 683 int rc = kstrtoint(buf, 0, &nd->nodeid); 684 685 if (rc) 686 return rc; 687 dlm_comm_seq(nd->nodeid, &seq); 688 nd->comm_seq = seq; 689 return len; 690 } 691 692 static ssize_t node_weight_show(struct config_item *item, char *buf) 693 { 694 return sprintf(buf, "%d\n", config_item_to_node(item)->weight); 695 } 696 697 static ssize_t node_weight_store(struct config_item *item, const char *buf, 698 size_t len) 699 { 700 int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight); 701 702 if (rc) 703 return rc; 704 return len; 705 } 706 707 CONFIGFS_ATTR(node_, nodeid); 708 CONFIGFS_ATTR(node_, weight); 709 710 static struct configfs_attribute *node_attrs[] = { 711 [NODE_ATTR_NODEID] = &node_attr_nodeid, 712 [NODE_ATTR_WEIGHT] = &node_attr_weight, 713 NULL, 714 }; 715 716 /* 717 * Functions for the dlm to get the info that's been configured 718 */ 719 720 static struct dlm_space *get_space(char *name) 721 { 722 struct config_item *i; 723 724 if (!space_list) 725 return NULL; 726 727 mutex_lock(&space_list->cg_subsys->su_mutex); 728 i = config_group_find_item(space_list, name); 729 mutex_unlock(&space_list->cg_subsys->su_mutex); 730 731 return config_item_to_space(i); 732 } 733 734 static void put_space(struct dlm_space *sp) 735 { 736 config_item_put(&sp->group.cg_item); 737 } 738 739 static struct dlm_comm *get_comm(int nodeid) 740 { 741 struct config_item *i; 742 struct dlm_comm *cm = NULL; 743 int found = 0; 744 745 if (!comm_list) 746 return NULL; 747 748 mutex_lock(&clusters_root.subsys.su_mutex); 749 750 list_for_each_entry(i, &comm_list->cg_children, ci_entry) { 751 cm = config_item_to_comm(i); 752 753 if (cm->nodeid != nodeid) 754 continue; 755 found = 1; 756 config_item_get(i); 757 break; 758 } 759 mutex_unlock(&clusters_root.subsys.su_mutex); 760 761 if (!found) 762 cm = NULL; 763 return cm; 764 } 765 766 static void put_comm(struct dlm_comm *cm) 767 { 768 config_item_put(&cm->item); 769 } 770 771 /* caller must free mem */ 772 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out, 773 int *count_out) 774 { 775 struct dlm_space *sp; 776 struct dlm_node *nd; 777 struct dlm_config_node *nodes, *node; 778 int rv, count; 779 780 sp = get_space(lsname); 781 if (!sp) 782 return -EEXIST; 783 784 mutex_lock(&sp->members_lock); 785 if (!sp->members_count) { 786 rv = -EINVAL; 787 printk(KERN_ERR "dlm: zero members_count\n"); 788 goto out; 789 } 790 791 count = sp->members_count; 792 793 nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS); 794 if (!nodes) { 795 rv = -ENOMEM; 796 goto out; 797 } 798 799 node = nodes; 800 list_for_each_entry(nd, &sp->members, list) { 801 node->nodeid = nd->nodeid; 802 node->weight = nd->weight; 803 node->new = nd->new; 804 node->comm_seq = nd->comm_seq; 805 node++; 806 807 nd->new = 0; 808 } 809 810 *count_out = count; 811 *nodes_out = nodes; 812 rv = 0; 813 out: 814 mutex_unlock(&sp->members_lock); 815 put_space(sp); 816 return rv; 817 } 818 819 int dlm_comm_seq(int nodeid, uint32_t *seq) 820 { 821 struct dlm_comm *cm = get_comm(nodeid); 822 if (!cm) 823 return -EEXIST; 824 *seq = cm->seq; 825 put_comm(cm); 826 return 0; 827 } 828 829 int dlm_our_nodeid(void) 830 { 831 return local_comm ? local_comm->nodeid : 0; 832 } 833 834 /* num 0 is first addr, num 1 is second addr */ 835 int dlm_our_addr(struct sockaddr_storage *addr, int num) 836 { 837 if (!local_comm) 838 return -1; 839 if (num + 1 > local_comm->addr_count) 840 return -1; 841 memcpy(addr, local_comm->addr[num], sizeof(*addr)); 842 return 0; 843 } 844 845 /* Config file defaults */ 846 #define DEFAULT_TCP_PORT 21064 847 #define DEFAULT_BUFFER_SIZE 4096 848 #define DEFAULT_RSBTBL_SIZE 1024 849 #define DEFAULT_RECOVER_TIMER 5 850 #define DEFAULT_TOSS_SECS 10 851 #define DEFAULT_SCAN_SECS 5 852 #define DEFAULT_LOG_DEBUG 0 853 #define DEFAULT_PROTOCOL 0 854 #define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */ 855 #define DEFAULT_WAITWARN_US 0 856 #define DEFAULT_NEW_RSB_COUNT 128 857 #define DEFAULT_RECOVER_CALLBACKS 0 858 #define DEFAULT_CLUSTER_NAME "" 859 860 struct dlm_config_info dlm_config = { 861 .ci_tcp_port = DEFAULT_TCP_PORT, 862 .ci_buffer_size = DEFAULT_BUFFER_SIZE, 863 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE, 864 .ci_recover_timer = DEFAULT_RECOVER_TIMER, 865 .ci_toss_secs = DEFAULT_TOSS_SECS, 866 .ci_scan_secs = DEFAULT_SCAN_SECS, 867 .ci_log_debug = DEFAULT_LOG_DEBUG, 868 .ci_protocol = DEFAULT_PROTOCOL, 869 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS, 870 .ci_waitwarn_us = DEFAULT_WAITWARN_US, 871 .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT, 872 .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS, 873 .ci_cluster_name = DEFAULT_CLUSTER_NAME 874 }; 875 876