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 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 int new; 288 }; 289 290 static struct configfs_group_operations clusters_ops = { 291 .make_group = make_cluster, 292 .drop_item = drop_cluster, 293 }; 294 295 static struct configfs_item_operations cluster_ops = { 296 .release = release_cluster, 297 .show_attribute = show_cluster, 298 .store_attribute = store_cluster, 299 }; 300 301 static struct configfs_group_operations spaces_ops = { 302 .make_group = make_space, 303 .drop_item = drop_space, 304 }; 305 306 static struct configfs_item_operations space_ops = { 307 .release = release_space, 308 }; 309 310 static struct configfs_group_operations comms_ops = { 311 .make_item = make_comm, 312 .drop_item = drop_comm, 313 }; 314 315 static struct configfs_item_operations comm_ops = { 316 .release = release_comm, 317 .show_attribute = show_comm, 318 .store_attribute = store_comm, 319 }; 320 321 static struct configfs_group_operations nodes_ops = { 322 .make_item = make_node, 323 .drop_item = drop_node, 324 }; 325 326 static struct configfs_item_operations node_ops = { 327 .release = release_node, 328 .show_attribute = show_node, 329 .store_attribute = store_node, 330 }; 331 332 static struct config_item_type clusters_type = { 333 .ct_group_ops = &clusters_ops, 334 .ct_owner = THIS_MODULE, 335 }; 336 337 static struct config_item_type cluster_type = { 338 .ct_item_ops = &cluster_ops, 339 .ct_attrs = cluster_attrs, 340 .ct_owner = THIS_MODULE, 341 }; 342 343 static struct config_item_type spaces_type = { 344 .ct_group_ops = &spaces_ops, 345 .ct_owner = THIS_MODULE, 346 }; 347 348 static struct config_item_type space_type = { 349 .ct_item_ops = &space_ops, 350 .ct_owner = THIS_MODULE, 351 }; 352 353 static struct config_item_type comms_type = { 354 .ct_group_ops = &comms_ops, 355 .ct_owner = THIS_MODULE, 356 }; 357 358 static struct config_item_type comm_type = { 359 .ct_item_ops = &comm_ops, 360 .ct_attrs = comm_attrs, 361 .ct_owner = THIS_MODULE, 362 }; 363 364 static struct config_item_type nodes_type = { 365 .ct_group_ops = &nodes_ops, 366 .ct_owner = THIS_MODULE, 367 }; 368 369 static struct config_item_type node_type = { 370 .ct_item_ops = &node_ops, 371 .ct_attrs = node_attrs, 372 .ct_owner = THIS_MODULE, 373 }; 374 375 static struct cluster *to_cluster(struct config_item *i) 376 { 377 return i ? container_of(to_config_group(i), struct cluster, group):NULL; 378 } 379 380 static struct space *to_space(struct config_item *i) 381 { 382 return i ? container_of(to_config_group(i), struct space, group) : NULL; 383 } 384 385 static struct comm *to_comm(struct config_item *i) 386 { 387 return i ? container_of(i, struct comm, item) : NULL; 388 } 389 390 static struct node *to_node(struct config_item *i) 391 { 392 return i ? container_of(i, struct node, item) : NULL; 393 } 394 395 static struct config_group *make_cluster(struct config_group *g, 396 const char *name) 397 { 398 struct cluster *cl = NULL; 399 struct spaces *sps = NULL; 400 struct comms *cms = NULL; 401 void *gps = NULL; 402 403 cl = kzalloc(sizeof(struct cluster), GFP_KERNEL); 404 gps = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL); 405 sps = kzalloc(sizeof(struct spaces), GFP_KERNEL); 406 cms = kzalloc(sizeof(struct comms), GFP_KERNEL); 407 408 if (!cl || !gps || !sps || !cms) 409 goto fail; 410 411 config_group_init_type_name(&cl->group, name, &cluster_type); 412 config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type); 413 config_group_init_type_name(&cms->cs_group, "comms", &comms_type); 414 415 cl->group.default_groups = gps; 416 cl->group.default_groups[0] = &sps->ss_group; 417 cl->group.default_groups[1] = &cms->cs_group; 418 cl->group.default_groups[2] = NULL; 419 420 cl->cl_tcp_port = dlm_config.ci_tcp_port; 421 cl->cl_buffer_size = dlm_config.ci_buffer_size; 422 cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size; 423 cl->cl_lkbtbl_size = dlm_config.ci_lkbtbl_size; 424 cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size; 425 cl->cl_recover_timer = dlm_config.ci_recover_timer; 426 cl->cl_toss_secs = dlm_config.ci_toss_secs; 427 cl->cl_scan_secs = dlm_config.ci_scan_secs; 428 cl->cl_log_debug = dlm_config.ci_log_debug; 429 cl->cl_protocol = dlm_config.ci_protocol; 430 cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs; 431 432 space_list = &sps->ss_group; 433 comm_list = &cms->cs_group; 434 return &cl->group; 435 436 fail: 437 kfree(cl); 438 kfree(gps); 439 kfree(sps); 440 kfree(cms); 441 return NULL; 442 } 443 444 static void drop_cluster(struct config_group *g, struct config_item *i) 445 { 446 struct cluster *cl = to_cluster(i); 447 struct config_item *tmp; 448 int j; 449 450 for (j = 0; cl->group.default_groups[j]; j++) { 451 tmp = &cl->group.default_groups[j]->cg_item; 452 cl->group.default_groups[j] = NULL; 453 config_item_put(tmp); 454 } 455 456 space_list = NULL; 457 comm_list = NULL; 458 459 config_item_put(i); 460 } 461 462 static void release_cluster(struct config_item *i) 463 { 464 struct cluster *cl = to_cluster(i); 465 kfree(cl->group.default_groups); 466 kfree(cl); 467 } 468 469 static struct config_group *make_space(struct config_group *g, const char *name) 470 { 471 struct space *sp = NULL; 472 struct nodes *nds = NULL; 473 void *gps = NULL; 474 475 sp = kzalloc(sizeof(struct space), GFP_KERNEL); 476 gps = kcalloc(2, sizeof(struct config_group *), GFP_KERNEL); 477 nds = kzalloc(sizeof(struct nodes), GFP_KERNEL); 478 479 if (!sp || !gps || !nds) 480 goto fail; 481 482 config_group_init_type_name(&sp->group, name, &space_type); 483 config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type); 484 485 sp->group.default_groups = gps; 486 sp->group.default_groups[0] = &nds->ns_group; 487 sp->group.default_groups[1] = NULL; 488 489 INIT_LIST_HEAD(&sp->members); 490 mutex_init(&sp->members_lock); 491 sp->members_count = 0; 492 return &sp->group; 493 494 fail: 495 kfree(sp); 496 kfree(gps); 497 kfree(nds); 498 return NULL; 499 } 500 501 static void drop_space(struct config_group *g, struct config_item *i) 502 { 503 struct space *sp = to_space(i); 504 struct config_item *tmp; 505 int j; 506 507 /* assert list_empty(&sp->members) */ 508 509 for (j = 0; sp->group.default_groups[j]; j++) { 510 tmp = &sp->group.default_groups[j]->cg_item; 511 sp->group.default_groups[j] = NULL; 512 config_item_put(tmp); 513 } 514 515 config_item_put(i); 516 } 517 518 static void release_space(struct config_item *i) 519 { 520 struct space *sp = to_space(i); 521 kfree(sp->group.default_groups); 522 kfree(sp); 523 } 524 525 static struct config_item *make_comm(struct config_group *g, const char *name) 526 { 527 struct comm *cm; 528 529 cm = kzalloc(sizeof(struct comm), GFP_KERNEL); 530 if (!cm) 531 return NULL; 532 533 config_item_init_type_name(&cm->item, name, &comm_type); 534 cm->nodeid = -1; 535 cm->local = 0; 536 cm->addr_count = 0; 537 return &cm->item; 538 } 539 540 static void drop_comm(struct config_group *g, struct config_item *i) 541 { 542 struct comm *cm = to_comm(i); 543 if (local_comm == cm) 544 local_comm = NULL; 545 dlm_lowcomms_close(cm->nodeid); 546 while (cm->addr_count--) 547 kfree(cm->addr[cm->addr_count]); 548 config_item_put(i); 549 } 550 551 static void release_comm(struct config_item *i) 552 { 553 struct comm *cm = to_comm(i); 554 kfree(cm); 555 } 556 557 static struct config_item *make_node(struct config_group *g, const char *name) 558 { 559 struct space *sp = to_space(g->cg_item.ci_parent); 560 struct node *nd; 561 562 nd = kzalloc(sizeof(struct node), GFP_KERNEL); 563 if (!nd) 564 return NULL; 565 566 config_item_init_type_name(&nd->item, name, &node_type); 567 nd->nodeid = -1; 568 nd->weight = 1; /* default weight of 1 if none is set */ 569 nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */ 570 571 mutex_lock(&sp->members_lock); 572 list_add(&nd->list, &sp->members); 573 sp->members_count++; 574 mutex_unlock(&sp->members_lock); 575 576 return &nd->item; 577 } 578 579 static void drop_node(struct config_group *g, struct config_item *i) 580 { 581 struct space *sp = to_space(g->cg_item.ci_parent); 582 struct node *nd = to_node(i); 583 584 mutex_lock(&sp->members_lock); 585 list_del(&nd->list); 586 sp->members_count--; 587 mutex_unlock(&sp->members_lock); 588 589 config_item_put(i); 590 } 591 592 static void release_node(struct config_item *i) 593 { 594 struct node *nd = to_node(i); 595 kfree(nd); 596 } 597 598 static struct clusters clusters_root = { 599 .subsys = { 600 .su_group = { 601 .cg_item = { 602 .ci_namebuf = "dlm", 603 .ci_type = &clusters_type, 604 }, 605 }, 606 }, 607 }; 608 609 int __init dlm_config_init(void) 610 { 611 config_group_init(&clusters_root.subsys.su_group); 612 mutex_init(&clusters_root.subsys.su_mutex); 613 return configfs_register_subsystem(&clusters_root.subsys); 614 } 615 616 void dlm_config_exit(void) 617 { 618 configfs_unregister_subsystem(&clusters_root.subsys); 619 } 620 621 /* 622 * Functions for user space to read/write attributes 623 */ 624 625 static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a, 626 char *buf) 627 { 628 struct cluster *cl = to_cluster(i); 629 struct cluster_attribute *cla = 630 container_of(a, struct cluster_attribute, attr); 631 return cla->show ? cla->show(cl, buf) : 0; 632 } 633 634 static ssize_t store_cluster(struct config_item *i, 635 struct configfs_attribute *a, 636 const char *buf, size_t len) 637 { 638 struct cluster *cl = to_cluster(i); 639 struct cluster_attribute *cla = 640 container_of(a, struct cluster_attribute, attr); 641 return cla->store ? cla->store(cl, buf, len) : -EINVAL; 642 } 643 644 static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a, 645 char *buf) 646 { 647 struct comm *cm = to_comm(i); 648 struct comm_attribute *cma = 649 container_of(a, struct comm_attribute, attr); 650 return cma->show ? cma->show(cm, buf) : 0; 651 } 652 653 static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a, 654 const char *buf, size_t len) 655 { 656 struct comm *cm = to_comm(i); 657 struct comm_attribute *cma = 658 container_of(a, struct comm_attribute, attr); 659 return cma->store ? cma->store(cm, buf, len) : -EINVAL; 660 } 661 662 static ssize_t comm_nodeid_read(struct comm *cm, char *buf) 663 { 664 return sprintf(buf, "%d\n", cm->nodeid); 665 } 666 667 static ssize_t comm_nodeid_write(struct comm *cm, const char *buf, size_t len) 668 { 669 cm->nodeid = simple_strtol(buf, NULL, 0); 670 return len; 671 } 672 673 static ssize_t comm_local_read(struct comm *cm, char *buf) 674 { 675 return sprintf(buf, "%d\n", cm->local); 676 } 677 678 static ssize_t comm_local_write(struct comm *cm, const char *buf, size_t len) 679 { 680 cm->local= simple_strtol(buf, NULL, 0); 681 if (cm->local && !local_comm) 682 local_comm = cm; 683 return len; 684 } 685 686 static ssize_t comm_addr_write(struct comm *cm, const char *buf, size_t len) 687 { 688 struct sockaddr_storage *addr; 689 690 if (len != sizeof(struct sockaddr_storage)) 691 return -EINVAL; 692 693 if (cm->addr_count >= DLM_MAX_ADDR_COUNT) 694 return -ENOSPC; 695 696 addr = kzalloc(sizeof(*addr), GFP_KERNEL); 697 if (!addr) 698 return -ENOMEM; 699 700 memcpy(addr, buf, len); 701 cm->addr[cm->addr_count++] = addr; 702 return len; 703 } 704 705 static ssize_t show_node(struct config_item *i, struct configfs_attribute *a, 706 char *buf) 707 { 708 struct node *nd = to_node(i); 709 struct node_attribute *nda = 710 container_of(a, struct node_attribute, attr); 711 return nda->show ? nda->show(nd, buf) : 0; 712 } 713 714 static ssize_t store_node(struct config_item *i, struct configfs_attribute *a, 715 const char *buf, size_t len) 716 { 717 struct node *nd = to_node(i); 718 struct node_attribute *nda = 719 container_of(a, struct node_attribute, attr); 720 return nda->store ? nda->store(nd, buf, len) : -EINVAL; 721 } 722 723 static ssize_t node_nodeid_read(struct node *nd, char *buf) 724 { 725 return sprintf(buf, "%d\n", nd->nodeid); 726 } 727 728 static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len) 729 { 730 nd->nodeid = simple_strtol(buf, NULL, 0); 731 return len; 732 } 733 734 static ssize_t node_weight_read(struct node *nd, char *buf) 735 { 736 return sprintf(buf, "%d\n", nd->weight); 737 } 738 739 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len) 740 { 741 nd->weight = simple_strtol(buf, NULL, 0); 742 return len; 743 } 744 745 /* 746 * Functions for the dlm to get the info that's been configured 747 */ 748 749 static struct space *get_space(char *name) 750 { 751 struct config_item *i; 752 753 if (!space_list) 754 return NULL; 755 756 mutex_lock(&space_list->cg_subsys->su_mutex); 757 i = config_group_find_item(space_list, name); 758 mutex_unlock(&space_list->cg_subsys->su_mutex); 759 760 return to_space(i); 761 } 762 763 static void put_space(struct space *sp) 764 { 765 config_item_put(&sp->group.cg_item); 766 } 767 768 static struct comm *get_comm(int nodeid, struct sockaddr_storage *addr) 769 { 770 struct config_item *i; 771 struct comm *cm = NULL; 772 int found = 0; 773 774 if (!comm_list) 775 return NULL; 776 777 mutex_lock(&clusters_root.subsys.su_mutex); 778 779 list_for_each_entry(i, &comm_list->cg_children, ci_entry) { 780 cm = to_comm(i); 781 782 if (nodeid) { 783 if (cm->nodeid != nodeid) 784 continue; 785 found = 1; 786 config_item_get(i); 787 break; 788 } else { 789 if (!cm->addr_count || 790 memcmp(cm->addr[0], addr, sizeof(*addr))) 791 continue; 792 found = 1; 793 config_item_get(i); 794 break; 795 } 796 } 797 mutex_unlock(&clusters_root.subsys.su_mutex); 798 799 if (!found) 800 cm = NULL; 801 return cm; 802 } 803 804 static void put_comm(struct comm *cm) 805 { 806 config_item_put(&cm->item); 807 } 808 809 /* caller must free mem */ 810 int dlm_nodeid_list(char *lsname, int **ids_out, int *ids_count_out, 811 int **new_out, int *new_count_out) 812 { 813 struct space *sp; 814 struct node *nd; 815 int i = 0, rv = 0, ids_count = 0, new_count = 0; 816 int *ids, *new; 817 818 sp = get_space(lsname); 819 if (!sp) 820 return -EEXIST; 821 822 mutex_lock(&sp->members_lock); 823 if (!sp->members_count) { 824 rv = -EINVAL; 825 printk(KERN_ERR "dlm: zero members_count\n"); 826 goto out; 827 } 828 829 ids_count = sp->members_count; 830 831 ids = kcalloc(ids_count, sizeof(int), GFP_KERNEL); 832 if (!ids) { 833 rv = -ENOMEM; 834 goto out; 835 } 836 837 list_for_each_entry(nd, &sp->members, list) { 838 ids[i++] = nd->nodeid; 839 if (nd->new) 840 new_count++; 841 } 842 843 if (ids_count != i) 844 printk(KERN_ERR "dlm: bad nodeid count %d %d\n", ids_count, i); 845 846 if (!new_count) 847 goto out_ids; 848 849 new = kcalloc(new_count, sizeof(int), GFP_KERNEL); 850 if (!new) { 851 kfree(ids); 852 rv = -ENOMEM; 853 goto out; 854 } 855 856 i = 0; 857 list_for_each_entry(nd, &sp->members, list) { 858 if (nd->new) { 859 new[i++] = nd->nodeid; 860 nd->new = 0; 861 } 862 } 863 *new_count_out = new_count; 864 *new_out = new; 865 866 out_ids: 867 *ids_count_out = ids_count; 868 *ids_out = ids; 869 out: 870 mutex_unlock(&sp->members_lock); 871 put_space(sp); 872 return rv; 873 } 874 875 int dlm_node_weight(char *lsname, int nodeid) 876 { 877 struct space *sp; 878 struct node *nd; 879 int w = -EEXIST; 880 881 sp = get_space(lsname); 882 if (!sp) 883 goto out; 884 885 mutex_lock(&sp->members_lock); 886 list_for_each_entry(nd, &sp->members, list) { 887 if (nd->nodeid != nodeid) 888 continue; 889 w = nd->weight; 890 break; 891 } 892 mutex_unlock(&sp->members_lock); 893 put_space(sp); 894 out: 895 return w; 896 } 897 898 int dlm_nodeid_to_addr(int nodeid, struct sockaddr_storage *addr) 899 { 900 struct comm *cm = get_comm(nodeid, NULL); 901 if (!cm) 902 return -EEXIST; 903 if (!cm->addr_count) 904 return -ENOENT; 905 memcpy(addr, cm->addr[0], sizeof(*addr)); 906 put_comm(cm); 907 return 0; 908 } 909 910 int dlm_addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) 911 { 912 struct comm *cm = get_comm(0, addr); 913 if (!cm) 914 return -EEXIST; 915 *nodeid = cm->nodeid; 916 put_comm(cm); 917 return 0; 918 } 919 920 int dlm_our_nodeid(void) 921 { 922 return local_comm ? local_comm->nodeid : 0; 923 } 924 925 /* num 0 is first addr, num 1 is second addr */ 926 int dlm_our_addr(struct sockaddr_storage *addr, int num) 927 { 928 if (!local_comm) 929 return -1; 930 if (num + 1 > local_comm->addr_count) 931 return -1; 932 memcpy(addr, local_comm->addr[num], sizeof(*addr)); 933 return 0; 934 } 935 936 /* Config file defaults */ 937 #define DEFAULT_TCP_PORT 21064 938 #define DEFAULT_BUFFER_SIZE 4096 939 #define DEFAULT_RSBTBL_SIZE 256 940 #define DEFAULT_LKBTBL_SIZE 1024 941 #define DEFAULT_DIRTBL_SIZE 512 942 #define DEFAULT_RECOVER_TIMER 5 943 #define DEFAULT_TOSS_SECS 10 944 #define DEFAULT_SCAN_SECS 5 945 #define DEFAULT_LOG_DEBUG 0 946 #define DEFAULT_PROTOCOL 0 947 #define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */ 948 949 struct dlm_config_info dlm_config = { 950 .ci_tcp_port = DEFAULT_TCP_PORT, 951 .ci_buffer_size = DEFAULT_BUFFER_SIZE, 952 .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE, 953 .ci_lkbtbl_size = DEFAULT_LKBTBL_SIZE, 954 .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE, 955 .ci_recover_timer = DEFAULT_RECOVER_TIMER, 956 .ci_toss_secs = DEFAULT_TOSS_SECS, 957 .ci_scan_secs = DEFAULT_SCAN_SECS, 958 .ci_log_debug = DEFAULT_LOG_DEBUG, 959 .ci_protocol = DEFAULT_PROTOCOL, 960 .ci_timewarn_cs = DEFAULT_TIMEWARN_CS 961 }; 962 963