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