1 /****************************************************************************** 2 ******************************************************************************* 3 ** 4 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 5 ** Copyright (C) 2004-2007 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 <net/sock.h> 18 19 #include "config.h" 20 #include "lowcomms.h" 21 22 /* 23 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid 24 * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight 25 * /config/dlm/<cluster>/comms/<comm>/nodeid 26 * /config/dlm/<cluster>/comms/<comm>/local 27 * /config/dlm/<cluster>/comms/<comm>/addr 28 * The <cluster> level is useless, but I haven't figured out how to avoid it. 29 */ 30 31 static struct config_group *space_list; 32 static struct config_group *comm_list; 33 static struct comm *local_comm; 34 35 struct clusters; 36 struct cluster; 37 struct spaces; 38 struct space; 39 struct comms; 40 struct comm; 41 struct nodes; 42 struct node; 43 44 static struct config_group *make_cluster(struct config_group *, const char *); 45 static void drop_cluster(struct config_group *, struct config_item *); 46 static void release_cluster(struct config_item *); 47 static struct config_group *make_space(struct config_group *, const char *); 48 static void drop_space(struct config_group *, struct config_item *); 49 static void release_space(struct config_item *); 50 static struct config_item *make_comm(struct config_group *, const char *); 51 static void drop_comm(struct config_group *, struct config_item *); 52 static void release_comm(struct config_item *); 53 static struct config_item *make_node(struct config_group *, const char *); 54 static void drop_node(struct config_group *, struct config_item *); 55 static void release_node(struct config_item *); 56 57 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a, 58 char *buf); 59 static ssize_t store_cluster(struct config_item *i, 60 struct configfs_attribute *a, 61 const char *buf, size_t len); 62 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a, 63 char *buf); 64 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a, 65 const char *buf, size_t len); 66 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a, 67 char *buf); 68 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a, 69 const char *buf, size_t len); 70 71 static ssize_t comm_nodeid_read(struct comm *cm, char *buf); 72 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len); 73 static ssize_t comm_local_read(struct comm *cm, char *buf); 74 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len); 75 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len); 76 static ssize_t node_nodeid_read(struct node *nd, char *buf); 77 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len); 78 static ssize_t node_weight_read(struct node *nd, char *buf); 79 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len); 80 81 struct cluster { 82 struct config_group group; 83 unsigned int cl_tcp_port; 84 unsigned int cl_buffer_size; 85 unsigned int cl_rsbtbl_size; 86 unsigned int cl_lkbtbl_size; 87 unsigned int cl_dirtbl_size; 88 unsigned int cl_recover_timer; 89 unsigned int cl_toss_secs; 90 unsigned int cl_scan_secs; 91 unsigned int cl_log_debug; 92 unsigned int cl_protocol; 93 unsigned int cl_timewarn_cs; 94 }; 95 96 enum { 97 CLUSTER_ATTR_TCP_PORT = 0, 98 CLUSTER_ATTR_BUFFER_SIZE, 99 CLUSTER_ATTR_RSBTBL_SIZE, 100 CLUSTER_ATTR_LKBTBL_SIZE, 101 CLUSTER_ATTR_DIRTBL_SIZE, 102 CLUSTER_ATTR_RECOVER_TIMER, 103 CLUSTER_ATTR_TOSS_SECS, 104 CLUSTER_ATTR_SCAN_SECS, 105 CLUSTER_ATTR_LOG_DEBUG, 106 CLUSTER_ATTR_PROTOCOL, 107 CLUSTER_ATTR_TIMEWARN_CS, 108 }; 109 110 struct cluster_attribute { 111 struct configfs_attribute attr; 112 ssize_t (*show)(struct cluster *, char *); 113 ssize_t (*store)(struct cluster *, const char *, size_t); 114 }; 115 116 static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field, 117 unsigned int *info_field, int check_zero, 118 const char *buf, size_t len) 119 { 120 unsigned int x; 121 122 if (!capable(CAP_SYS_ADMIN)) 123 return -EACCES; 124 125 x = simple_strtoul(buf, NULL, 0); 126 127 if (check_zero && !x) 128 return -EINVAL; 129 130 *cl_field = x; 131 *info_field = x; 132 133 return len; 134 } 135 136 #define CLUSTER_ATTR(name, check_zero) \ 137 static ssize_t name##_write(struct cluster *cl, const char *buf, size_t len) \ 138 { \ 139 return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \ 140 check_zero, buf, len); \ 141 } \ 142 static ssize_t name##_read(struct cluster *cl, char *buf) \ 143 { \ 144 return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \ 145 } \ 146 static struct cluster_attribute cluster_attr_##name = \ 147 __CONFIGFS_ATTR(name, 0644, name##_read, name##_write) 148 149 CLUSTER_ATTR(tcp_port, 1); 150 CLUSTER_ATTR(buffer_size, 1); 151 CLUSTER_ATTR(rsbtbl_size, 1); 152 CLUSTER_ATTR(lkbtbl_size, 1); 153 CLUSTER_ATTR(dirtbl_size, 1); 154 CLUSTER_ATTR(recover_timer, 1); 155 CLUSTER_ATTR(toss_secs, 1); 156 CLUSTER_ATTR(scan_secs, 1); 157 CLUSTER_ATTR(log_debug, 0); 158 CLUSTER_ATTR(protocol, 0); 159 CLUSTER_ATTR(timewarn_cs, 1); 160 161 static struct configfs_attribute *cluster_attrs[] = { 162 [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr, 163 [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr, 164 [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr, 165 [CLUSTER_ATTR_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr, 166 [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr, 167 [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr, 168 [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr, 169 [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr, 170 [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr, 171 [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr, 172 [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr, 173 NULL, 174 }; 175 176 enum { 177 COMM_ATTR_NODEID = 0, 178 COMM_ATTR_LOCAL, 179 COMM_ATTR_ADDR, 180 }; 181 182 struct comm_attribute { 183 struct configfs_attribute attr; 184 ssize_t (*show)(struct comm *, char *); 185 ssize_t (*store)(struct comm *, const char *, size_t); 186 }; 187 188 static struct comm_attribute comm_attr_nodeid = { 189 .attr = { .ca_owner = THIS_MODULE, 190 .ca_name = "nodeid", 191 .ca_mode = S_IRUGO | S_IWUSR }, 192 .show = comm_nodeid_read, 193 .store = comm_nodeid_write, 194 }; 195 196 static struct comm_attribute comm_attr_local = { 197 .attr = { .ca_owner = THIS_MODULE, 198 .ca_name = "local", 199 .ca_mode = S_IRUGO | S_IWUSR }, 200 .show = comm_local_read, 201 .store = comm_local_write, 202 }; 203 204 static struct comm_attribute comm_attr_addr = { 205 .attr = { .ca_owner = THIS_MODULE, 206 .ca_name = "addr", 207 .ca_mode = S_IRUGO | S_IWUSR }, 208 .store = comm_addr_write, 209 }; 210 211 static struct configfs_attribute *comm_attrs[] = { 212 [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr, 213 [COMM_ATTR_LOCAL] = &comm_attr_local.attr, 214 [COMM_ATTR_ADDR] = &comm_attr_addr.attr, 215 NULL, 216 }; 217 218 enum { 219 NODE_ATTR_NODEID = 0, 220 NODE_ATTR_WEIGHT, 221 }; 222 223 struct node_attribute { 224 struct configfs_attribute attr; 225 ssize_t (*show)(struct node *, char *); 226 ssize_t (*store)(struct node *, const char *, size_t); 227 }; 228 229 static struct node_attribute node_attr_nodeid = { 230 .attr = { .ca_owner = THIS_MODULE, 231 .ca_name = "nodeid", 232 .ca_mode = S_IRUGO | S_IWUSR }, 233 .show = node_nodeid_read, 234 .store = node_nodeid_write, 235 }; 236 237 static struct node_attribute node_attr_weight = { 238 .attr = { .ca_owner = THIS_MODULE, 239 .ca_name = "weight", 240 .ca_mode = S_IRUGO | S_IWUSR }, 241 .show = node_weight_read, 242 .store = node_weight_write, 243 }; 244 245 static struct configfs_attribute *node_attrs[] = { 246 [NODE_ATTR_NODEID] = &node_attr_nodeid.attr, 247 [NODE_ATTR_WEIGHT] = &node_attr_weight.attr, 248 NULL, 249 }; 250 251 struct clusters { 252 struct configfs_subsystem subsys; 253 }; 254 255 struct spaces { 256 struct config_group ss_group; 257 }; 258 259 struct space { 260 struct config_group group; 261 struct list_head members; 262 struct mutex members_lock; 263 int members_count; 264 }; 265 266 struct comms { 267 struct config_group cs_group; 268 }; 269 270 struct comm { 271 struct config_item item; 272 int nodeid; 273 int local; 274 int addr_count; 275 struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; 276 }; 277 278 struct nodes { 279 struct config_group ns_group; 280 }; 281 282 struct node { 283 struct config_item item; 284 struct list_head list; /* space->members */ 285 int nodeid; 286 int weight; 287 }; 288 289 static struct configfs_group_operations clusters_ops = { 290 .make_group = make_cluster, 291 .drop_item = drop_cluster, 292 }; 293 294 static struct configfs_item_operations cluster_ops = { 295 .release = release_cluster, 296 .show_attribute = show_cluster, 297 .store_attribute = store_cluster, 298 }; 299 300 static struct configfs_group_operations spaces_ops = { 301 .make_group = make_space, 302 .drop_item = drop_space, 303 }; 304 305 static struct configfs_item_operations space_ops = { 306 .release = release_space, 307 }; 308 309 static struct configfs_group_operations comms_ops = { 310 .make_item = make_comm, 311 .drop_item = drop_comm, 312 }; 313 314 static struct configfs_item_operations comm_ops = { 315 .release = release_comm, 316 .show_attribute = show_comm, 317 .store_attribute = store_comm, 318 }; 319 320 static struct configfs_group_operations nodes_ops = { 321 .make_item = make_node, 322 .drop_item = drop_node, 323 }; 324 325 static struct configfs_item_operations node_ops = { 326 .release = release_node, 327 .show_attribute = show_node, 328 .store_attribute = store_node, 329 }; 330 331 static struct config_item_type clusters_type = { 332 .ct_group_ops = &clusters_ops, 333 .ct_owner = THIS_MODULE, 334 }; 335 336 static struct config_item_type cluster_type = { 337 .ct_item_ops = &cluster_ops, 338 .ct_attrs = cluster_attrs, 339 .ct_owner = THIS_MODULE, 340 }; 341 342 static struct config_item_type spaces_type = { 343 .ct_group_ops = &spaces_ops, 344 .ct_owner = THIS_MODULE, 345 }; 346 347 static struct config_item_type space_type = { 348 .ct_item_ops = &space_ops, 349 .ct_owner = THIS_MODULE, 350 }; 351 352 static struct config_item_type comms_type = { 353 .ct_group_ops = &comms_ops, 354 .ct_owner = THIS_MODULE, 355 }; 356 357 static struct config_item_type comm_type = { 358 .ct_item_ops = &comm_ops, 359 .ct_attrs = comm_attrs, 360 .ct_owner = THIS_MODULE, 361 }; 362 363 static struct config_item_type nodes_type = { 364 .ct_group_ops = &nodes_ops, 365 .ct_owner = THIS_MODULE, 366 }; 367 368 static struct config_item_type node_type = { 369 .ct_item_ops = &node_ops, 370 .ct_attrs = node_attrs, 371 .ct_owner = THIS_MODULE, 372 }; 373 374 static struct cluster *to_cluster(struct config_item *i) 375 { 376 return i ? container_of(to_config_group(i), struct cluster, group):NULL; 377 } 378 379 static struct space *to_space(struct config_item *i) 380 { 381 return i ? container_of(to_config_group(i), struct space, group) : NULL; 382 } 383 384 static struct comm *to_comm(struct config_item *i) 385 { 386 return i ? container_of(i, struct comm, item) : NULL; 387 } 388 389 static struct node *to_node(struct config_item *i) 390 { 391 return i ? container_of(i, struct node, item) : NULL; 392 } 393 394 static struct config_group *make_cluster(struct config_group *g, 395 const char *name) 396 { 397 struct cluster *cl = NULL; 398 struct spaces *sps = NULL; 399 struct comms *cms = NULL; 400 void *gps = NULL; 401 402 cl = kzalloc(sizeof(struct cluster), GFP_KERNEL); 403 gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL); 404 sps = kzalloc(sizeof(struct spaces), GFP_KERNEL); 405 cms = kzalloc(sizeof(struct comms), GFP_KERNEL); 406 407 if (!cl || !gps || !sps || !cms) 408 goto fail; 409 410 config_group_init_type_name(&cl->group, name, &cluster_type); 411 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type); 412 config_group_init_type_name(&cms->cs_group, "comms", &comms_type); 413 414 cl->group.default_groups = gps; 415 cl->group.default_groups[0] = &sps->ss_group; 416 cl->group.default_groups[1] = &cms->cs_group; 417 cl->group.default_groups[2] = NULL; 418 419 cl->cl_tcp_port = dlm_config.ci_tcp_port; 420 cl->cl_buffer_size = dlm_config.ci_buffer_size; 421 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size; 422 cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size; 423 cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size; 424 cl->cl_recover_timer = dlm_config.ci_recover_timer; 425 cl->cl_toss_secs = dlm_config.ci_toss_secs; 426 cl->cl_scan_secs = dlm_config.ci_scan_secs; 427 cl->cl_log_debug = dlm_config.ci_log_debug; 428 cl->cl_protocol = dlm_config.ci_protocol; 429 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs; 430 431 space_list = &sps->ss_group; 432 comm_list = &cms->cs_group; 433 return &cl->group; 434 435 fail: 436 kfree(cl); 437 kfree(gps); 438 kfree(sps); 439 kfree(cms); 440 return NULL; 441 } 442 443 static void drop_cluster(struct config_group *g, struct config_item *i) 444 { 445 struct cluster *cl = to_cluster(i); 446 struct config_item *tmp; 447 int j; 448 449 for (j = 0; cl->group.default_groups[j]; j++) { 450 tmp = &cl->group.default_groups[j]->cg_item; 451 cl->group.default_groups[j] = NULL; 452 config_item_put(tmp); 453 } 454 455 space_list = NULL; 456 comm_list = NULL; 457 458 config_item_put(i); 459 } 460 461 static void release_cluster(struct config_item *i) 462 { 463 struct cluster *cl = to_cluster(i); 464 kfree(cl->group.default_groups); 465 kfree(cl); 466 } 467 468 static struct config_group *make_space(struct config_group *g, const char *name) 469 { 470 struct space *sp = NULL; 471 struct nodes *nds = NULL; 472 void *gps = NULL; 473 474 sp = kzalloc(sizeof(struct space), GFP_KERNEL); 475 gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL); 476 nds = kzalloc(sizeof(struct nodes), GFP_KERNEL); 477 478 if (!sp || !gps || !nds) 479 goto fail; 480 481 config_group_init_type_name(&sp->group, name, &space_type); 482 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type); 483 484 sp->group.default_groups = gps; 485 sp->group.default_groups[0] = &nds->ns_group; 486 sp->group.default_groups[1] = NULL; 487 488 INIT_LIST_HEAD(&sp->members); 489 mutex_init(&sp->members_lock); 490 sp->members_count = 0; 491 return &sp->group; 492 493 fail: 494 kfree(sp); 495 kfree(gps); 496 kfree(nds); 497 return NULL; 498 } 499 500 static void drop_space(struct config_group *g, struct config_item *i) 501 { 502 struct space *sp = to_space(i); 503 struct config_item *tmp; 504 int j; 505 506 /* assert list_empty(&sp->members) */ 507 508 for (j = 0; sp->group.default_groups[j]; j++) { 509 tmp = &sp->group.default_groups[j]->cg_item; 510 sp->group.default_groups[j] = NULL; 511 config_item_put(tmp); 512 } 513 514 config_item_put(i); 515 } 516 517 static void release_space(struct config_item *i) 518 { 519 struct space *sp = to_space(i); 520 kfree(sp->group.default_groups); 521 kfree(sp); 522 } 523 524 static struct config_item *make_comm(struct config_group *g, const char *name) 525 { 526 struct comm *cm; 527 528 cm = kzalloc(sizeof(struct comm), GFP_KERNEL); 529 if (!cm) 530 return NULL; 531 532 config_item_init_type_name(&cm->item, name, &comm_type); 533 cm->nodeid = -1; 534 cm->local = 0; 535 cm->addr_count = 0; 536 return &cm->item; 537 } 538 539 static void drop_comm(struct config_group *g, struct config_item *i) 540 { 541 struct comm *cm = to_comm(i); 542 if (local_comm == cm) 543 local_comm = NULL; 544 dlm_lowcomms_close(cm->nodeid); 545 while (cm->addr_count--) 546 kfree(cm->addr[cm->addr_count]); 547 config_item_put(i); 548 } 549 550 static void release_comm(struct config_item *i) 551 { 552 struct comm *cm = to_comm(i); 553 kfree(cm); 554 } 555 556 static struct config_item *make_node(struct config_group *g, const char *name) 557 { 558 struct space *sp = to_space(g->cg_item.ci_parent); 559 struct node *nd; 560 561 nd = kzalloc(sizeof(struct node), GFP_KERNEL); 562 if (!nd) 563 return NULL; 564 565 config_item_init_type_name(&nd->item, name, &node_type); 566 nd->nodeid = -1; 567 nd->weight = 1; /* default weight of 1 if none is set */ 568 569 mutex_lock(&sp->members_lock); 570 list_add(&nd->list, &sp->members); 571 sp->members_count++; 572 mutex_unlock(&sp->members_lock); 573 574 return &nd->item; 575 } 576 577 static void drop_node(struct config_group *g, struct config_item *i) 578 { 579 struct space *sp = to_space(g->cg_item.ci_parent); 580 struct node *nd = to_node(i); 581 582 mutex_lock(&sp->members_lock); 583 list_del(&nd->list); 584 sp->members_count--; 585 mutex_unlock(&sp->members_lock); 586 587 config_item_put(i); 588 } 589 590 static void release_node(struct config_item *i) 591 { 592 struct node *nd = to_node(i); 593 kfree(nd); 594 } 595 596 static struct clusters clusters_root = { 597 .subsys = { 598 .su_group = { 599 .cg_item = { 600 .ci_namebuf = "dlm", 601 .ci_type = &clusters_type, 602 }, 603 }, 604 }, 605 }; 606 607 int dlm_config_init(void) 608 { 609 config_group_init(&clusters_root.subsys.su_group); 610 mutex_init(&clusters_root.subsys.su_mutex); 611 return configfs_register_subsystem(&clusters_root.subsys); 612 } 613 614 void dlm_config_exit(void) 615 { 616 configfs_unregister_subsystem(&clusters_root.subsys); 617 } 618 619 /* 620 * Functions for user space to read/write attributes 621 */ 622 623 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a, 624 char *buf) 625 { 626 struct cluster *cl = to_cluster(i); 627 struct cluster_attribute *cla = 628 container_of(a, struct cluster_attribute, attr); 629 return cla->show ? cla->show(cl, buf) : 0; 630 } 631 632 static ssize_t store_cluster(struct config_item *i, 633 struct configfs_attribute *a, 634 const char *buf, size_t len) 635 { 636 struct cluster *cl = to_cluster(i); 637 struct cluster_attribute *cla = 638 container_of(a, struct cluster_attribute, attr); 639 return cla->store ? cla->store(cl, buf, len) : -EINVAL; 640 } 641 642 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a, 643 char *buf) 644 { 645 struct comm *cm = to_comm(i); 646 struct comm_attribute *cma = 647 container_of(a, struct comm_attribute, attr); 648 return cma->show ? cma->show(cm, buf) : 0; 649 } 650 651 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a, 652 const char *buf, size_t len) 653 { 654 struct comm *cm = to_comm(i); 655 struct comm_attribute *cma = 656 container_of(a, struct comm_attribute, attr); 657 return cma->store ? cma->store(cm, buf, len) : -EINVAL; 658 } 659 660 static ssize_t comm_nodeid_read(struct comm *cm, char *buf) 661 { 662 return sprintf(buf, "%d\n", cm->nodeid); 663 } 664 665 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len) 666 { 667 cm->nodeid = simple_strtol(buf, NULL, 0); 668 return len; 669 } 670 671 static ssize_t comm_local_read(struct comm *cm, char *buf) 672 { 673 return sprintf(buf, "%d\n", cm->local); 674 } 675 676 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len) 677 { 678 cm->local= simple_strtol(buf, NULL, 0); 679 if (cm->local && !local_comm) 680 local_comm = cm; 681 return len; 682 } 683 684 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len) 685 { 686 struct sockaddr_storage *addr; 687 688 if (len != sizeof(struct sockaddr_storage)) 689 return -EINVAL; 690 691 if (cm->addr_count >= DLM_MAX_ADDR_COUNT) 692 return -ENOSPC; 693 694 addr = kzalloc(sizeof(*addr), GFP_KERNEL); 695 if (!addr) 696 return -ENOMEM; 697 698 memcpy(addr, buf, len); 699 cm->addr[cm->addr_count++] = addr; 700 return len; 701 } 702 703 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a, 704 char *buf) 705 { 706 struct node *nd = to_node(i); 707 struct node_attribute *nda = 708 container_of(a, struct node_attribute, attr); 709 return nda->show ? nda->show(nd, buf) : 0; 710 } 711 712 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a, 713 const char *buf, size_t len) 714 { 715 struct node *nd = to_node(i); 716 struct node_attribute *nda = 717 container_of(a, struct node_attribute, attr); 718 return nda->store ? nda->store(nd, buf, len) : -EINVAL; 719 } 720 721 static ssize_t node_nodeid_read(struct node *nd, char *buf) 722 { 723 return sprintf(buf, "%d\n", nd->nodeid); 724 } 725 726 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len) 727 { 728 nd->nodeid = simple_strtol(buf, NULL, 0); 729 return len; 730 } 731 732 static ssize_t node_weight_read(struct node *nd, char *buf) 733 { 734 return sprintf(buf, "%d\n", nd->weight); 735 } 736 737 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len) 738 { 739 nd->weight = simple_strtol(buf, NULL, 0); 740 return len; 741 } 742 743 /* 744 * Functions for the dlm to get the info that's been configured 745 */ 746 747 static struct space *get_space(char *name) 748 { 749 struct config_item *i; 750 751 if (!space_list) 752 return NULL; 753 754 mutex_lock(&space_list->cg_subsys->su_mutex); 755 i = config_group_find_item(space_list, name); 756 mutex_unlock(&space_list->cg_subsys->su_mutex); 757 758 return to_space(i); 759 } 760 761 static void put_space(struct space *sp) 762 { 763 config_item_put(&sp->group.cg_item); 764 } 765 766 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr) 767 { 768 struct config_item *i; 769 struct comm *cm = NULL; 770 int found = 0; 771 772 if (!comm_list) 773 return NULL; 774 775 mutex_lock(&clusters_root.subsys.su_mutex); 776 777 list_for_each_entry(i, &comm_list->cg_children, ci_entry) { 778 cm = to_comm(i); 779 780 if (nodeid) { 781 if (cm->nodeid != nodeid) 782 continue; 783 found = 1; 784 config_item_get(i); 785 break; 786 } else { 787 if (!cm->addr_count || 788 memcmp(cm->addr[0], addr, sizeof(*addr))) 789 continue; 790 found = 1; 791 config_item_get(i); 792 break; 793 } 794 } 795 mutex_unlock(&clusters_root.subsys.su_mutex); 796 797 if (!found) 798 cm = NULL; 799 return cm; 800 } 801 802 static void put_comm(struct comm *cm) 803 { 804 config_item_put(&cm->item); 805 } 806 807 /* caller must free mem */ 808 int dlm_nodeid_list(char *lsname, int **ids_out) 809 { 810 struct space *sp; 811 struct node *nd; 812 int i = 0, rv = 0; 813 int *ids; 814 815 sp = get_space(lsname); 816 if (!sp) 817 return -EEXIST; 818 819 mutex_lock(&sp->members_lock); 820 if (!sp->members_count) { 821 rv = 0; 822 goto out; 823 } 824 825 ids = kcalloc(sp->members_count, sizeof(int), GFP_KERNEL); 826 if (!ids) { 827 rv = -ENOMEM; 828 goto out; 829 } 830 831 rv = sp->members_count; 832 list_for_each_entry(nd, &sp->members, list) 833 ids[i++] = nd->nodeid; 834 835 if (rv != i) 836 printk("bad nodeid count %d %d\n", rv, i); 837 838 *ids_out = ids; 839 out: 840 mutex_unlock(&sp->members_lock); 841 put_space(sp); 842 return rv; 843 } 844 845 int dlm_node_weight(char *lsname, int nodeid) 846 { 847 struct space *sp; 848 struct node *nd; 849 int w = -EEXIST; 850 851 sp = get_space(lsname); 852 if (!sp) 853 goto out; 854 855 mutex_lock(&sp->members_lock); 856 list_for_each_entry(nd, &sp->members, list) { 857 if (nd->nodeid != nodeid) 858 continue; 859 w = nd->weight; 860 break; 861 } 862 mutex_unlock(&sp->members_lock); 863 put_space(sp); 864 out: 865 return w; 866 } 867 868 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr) 869 { 870 struct comm *cm = get_comm(nodeid, NULL); 871 if (!cm) 872 return -EEXIST; 873 if (!cm->addr_count) 874 return -ENOENT; 875 memcpy(addr, cm->addr[0], sizeof(*addr)); 876 put_comm(cm); 877 return 0; 878 } 879 880 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) 881 { 882 struct comm *cm = get_comm(0, addr); 883 if (!cm) 884 return -EEXIST; 885 *nodeid = cm->nodeid; 886 put_comm(cm); 887 return 0; 888 } 889 890 int dlm_our_nodeid(void) 891 { 892 return local_comm ? local_comm->nodeid : 0; 893 } 894 895 /* num 0 is first addr, num 1 is second addr */ 896 int dlm_our_addr(struct sockaddr_storage *addr, int num) 897 { 898 if (!local_comm) 899 return -1; 900 if (num + 1 > local_comm->addr_count) 901 return -1; 902 memcpy(addr, local_comm->addr[num], sizeof(*addr)); 903 return 0; 904 } 905 906 /* Config file defaults */ 907 #define DEFAULT_TCP_PORT 21064 908 #define DEFAULT_BUFFER_SIZE 4096 909 #define DEFAULT_RSBTBL_SIZE 256 910 #define DEFAULT_LKBTBL_SIZE 1024 911 #define DEFAULT_DIRTBL_SIZE 512 912 #define DEFAULT_RECOVER_TIMER 5 913 #define DEFAULT_TOSS_SECS 10 914 #define DEFAULT_SCAN_SECS 5 915 #define DEFAULT_LOG_DEBUG 0 916 #define DEFAULT_PROTOCOL 0 917 #define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */ 918 919 struct dlm_config_info dlm_config = { 920 .ci_tcp_port = DEFAULT_TCP_PORT, 921 .ci_buffer_size = DEFAULT_BUFFER_SIZE, 922 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE, 923 .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE, 924 .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE, 925 .ci_recover_timer = DEFAULT_RECOVER_TIMER, 926 .ci_toss_secs = DEFAULT_TOSS_SECS, 927 .ci_scan_secs = DEFAULT_SCAN_SECS, 928 .ci_log_debug = DEFAULT_LOG_DEBUG, 929 .ci_protocol = DEFAULT_PROTOCOL, 930 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS 931 }; 932 933