| 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 | |