| 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 ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a, |
| 65 | char *buf); |
| 66 | static ssize_t store_cluster(struct config_item *i, |
| 67 | struct configfs_attribute *a, |
| 68 | const char *buf, size_t len); |
| 69 | static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a, |
| 70 | char *buf); |
| 71 | static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a, |
| 72 | const char *buf, size_t len); |
| 73 | static ssize_t show_node(struct config_item *i, struct configfs_attribute *a, |
| 74 | char *buf); |
| 75 | static ssize_t store_node(struct config_item *i, struct configfs_attribute *a, |
| 76 | const char *buf, size_t len); |
| 77 | |
| 78 | static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf); |
| 79 | static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf, |
| 80 | size_t len); |
| 81 | static ssize_t comm_local_read(struct dlm_comm *cm, char *buf); |
| 82 | static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf, |
| 83 | size_t len); |
| 84 | static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, |
| 85 | size_t len); |
| 86 | static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf); |
| 87 | static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf); |
| 88 | static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf, |
| 89 | size_t len); |
| 90 | static ssize_t node_weight_read(struct dlm_node *nd, char *buf); |
| 91 | static ssize_t node_weight_write(struct dlm_node *nd, const char *buf, |
| 92 | size_t len); |
| 93 | |
| 94 | struct dlm_cluster { |
| 95 | struct config_group group; |
| 96 | unsigned int cl_tcp_port; |
| 97 | unsigned int cl_buffer_size; |
| 98 | unsigned int cl_rsbtbl_size; |
| 99 | unsigned int cl_recover_timer; |
| 100 | unsigned int cl_toss_secs; |
| 101 | unsigned int cl_scan_secs; |
| 102 | unsigned int cl_log_debug; |
| 103 | unsigned int cl_protocol; |
| 104 | unsigned int cl_timewarn_cs; |
| 105 | unsigned int cl_waitwarn_us; |
| 106 | unsigned int cl_new_rsb_count; |
| 107 | unsigned int cl_recover_callbacks; |
| 108 | char cl_cluster_name[DLM_LOCKSPACE_LEN]; |
| 109 | }; |
| 110 | |
| 111 | enum { |
| 112 | CLUSTER_ATTR_TCP_PORT = 0, |
| 113 | CLUSTER_ATTR_BUFFER_SIZE, |
| 114 | CLUSTER_ATTR_RSBTBL_SIZE, |
| 115 | CLUSTER_ATTR_RECOVER_TIMER, |
| 116 | CLUSTER_ATTR_TOSS_SECS, |
| 117 | CLUSTER_ATTR_SCAN_SECS, |
| 118 | CLUSTER_ATTR_LOG_DEBUG, |
| 119 | CLUSTER_ATTR_PROTOCOL, |
| 120 | CLUSTER_ATTR_TIMEWARN_CS, |
| 121 | CLUSTER_ATTR_WAITWARN_US, |
| 122 | CLUSTER_ATTR_NEW_RSB_COUNT, |
| 123 | CLUSTER_ATTR_RECOVER_CALLBACKS, |
| 124 | CLUSTER_ATTR_CLUSTER_NAME, |
| 125 | }; |
| 126 | |
| 127 | struct cluster_attribute { |
| 128 | struct configfs_attribute attr; |
| 129 | ssize_t (*show)(struct dlm_cluster *, char *); |
| 130 | ssize_t (*store)(struct dlm_cluster *, const char *, size_t); |
| 131 | }; |
| 132 | |
| 133 | static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf) |
| 134 | { |
| 135 | return sprintf(buf, "%s\n", cl->cl_cluster_name); |
| 136 | } |
| 137 | |
| 138 | static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl, |
| 139 | const char *buf, size_t len) |
| 140 | { |
| 141 | strlcpy(dlm_config.ci_cluster_name, buf, |
| 142 | sizeof(dlm_config.ci_cluster_name)); |
| 143 | strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name)); |
| 144 | return len; |
| 145 | } |
| 146 | |
| 147 | static struct cluster_attribute cluster_attr_cluster_name = { |
| 148 | .attr = { .ca_owner = THIS_MODULE, |
| 149 | .ca_name = "cluster_name", |
| 150 | .ca_mode = S_IRUGO | S_IWUSR }, |
| 151 | .show = cluster_cluster_name_read, |
| 152 | .store = cluster_cluster_name_write, |
| 153 | }; |
| 154 | |
| 155 | static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field, |
| 156 | int *info_field, int check_zero, |
| 157 | const char *buf, size_t len) |
| 158 | { |
| 159 | unsigned int x; |
| 160 | int rc; |
| 161 | |
| 162 | if (!capable(CAP_SYS_ADMIN)) |
| 163 | return -EPERM; |
| 164 | rc = kstrtouint(buf, 0, &x); |
| 165 | if (rc) |
| 166 | return rc; |
| 167 | |
| 168 | if (check_zero && !x) |
| 169 | return -EINVAL; |
| 170 | |
| 171 | *cl_field = x; |
| 172 | *info_field = x; |
| 173 | |
| 174 | return len; |
| 175 | } |
| 176 | |
| 177 | #define CLUSTER_ATTR(name, check_zero) \ |
| 178 | static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \ |
| 179 | { \ |
| 180 | return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \ |
| 181 | check_zero, buf, len); \ |
| 182 | } \ |
| 183 | static ssize_t name##_read(struct dlm_cluster *cl, char *buf) \ |
| 184 | { \ |
| 185 | return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \ |
| 186 | } \ |
| 187 | static struct cluster_attribute cluster_attr_##name = \ |
| 188 | __CONFIGFS_ATTR(name, 0644, name##_read, name##_write) |
| 189 | |
| 190 | CLUSTER_ATTR(tcp_port, 1); |
| 191 | CLUSTER_ATTR(buffer_size, 1); |
| 192 | CLUSTER_ATTR(rsbtbl_size, 1); |
| 193 | CLUSTER_ATTR(recover_timer, 1); |
| 194 | CLUSTER_ATTR(toss_secs, 1); |
| 195 | CLUSTER_ATTR(scan_secs, 1); |
| 196 | CLUSTER_ATTR(log_debug, 0); |
| 197 | CLUSTER_ATTR(protocol, 0); |
| 198 | CLUSTER_ATTR(timewarn_cs, 1); |
| 199 | CLUSTER_ATTR(waitwarn_us, 0); |
| 200 | CLUSTER_ATTR(new_rsb_count, 0); |
| 201 | CLUSTER_ATTR(recover_callbacks, 0); |
| 202 | |
| 203 | static struct configfs_attribute *cluster_attrs[] = { |
| 204 | [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr, |
| 205 | [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr, |
| 206 | [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr, |
| 207 | [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr, |
| 208 | [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr, |
| 209 | [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr, |
| 210 | [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr, |
| 211 | [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr, |
| 212 | [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr, |
| 213 | [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr, |
| 214 | [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr, |
| 215 | [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr, |
| 216 | [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr, |
| 217 | NULL, |
| 218 | }; |
| 219 | |
| 220 | enum { |
| 221 | COMM_ATTR_NODEID = 0, |
| 222 | COMM_ATTR_LOCAL, |
| 223 | COMM_ATTR_ADDR, |
| 224 | COMM_ATTR_ADDR_LIST, |
| 225 | }; |
| 226 | |
| 227 | struct comm_attribute { |
| 228 | struct configfs_attribute attr; |
| 229 | ssize_t (*show)(struct dlm_comm *, char *); |
| 230 | ssize_t (*store)(struct dlm_comm *, const char *, size_t); |
| 231 | }; |
| 232 | |
| 233 | static struct comm_attribute comm_attr_nodeid = { |
| 234 | .attr = { .ca_owner = THIS_MODULE, |
| 235 | .ca_name = "nodeid", |
| 236 | .ca_mode = S_IRUGO | S_IWUSR }, |
| 237 | .show = comm_nodeid_read, |
| 238 | .store = comm_nodeid_write, |
| 239 | }; |
| 240 | |
| 241 | static struct comm_attribute comm_attr_local = { |
| 242 | .attr = { .ca_owner = THIS_MODULE, |
| 243 | .ca_name = "local", |
| 244 | .ca_mode = S_IRUGO | S_IWUSR }, |
| 245 | .show = comm_local_read, |
| 246 | .store = comm_local_write, |
| 247 | }; |
| 248 | |
| 249 | static struct comm_attribute comm_attr_addr = { |
| 250 | .attr = { .ca_owner = THIS_MODULE, |
| 251 | .ca_name = "addr", |
| 252 | .ca_mode = S_IWUSR }, |
| 253 | .store = comm_addr_write, |
| 254 | }; |
| 255 | |
| 256 | static struct comm_attribute comm_attr_addr_list = { |
| 257 | .attr = { .ca_owner = THIS_MODULE, |
| 258 | .ca_name = "addr_list", |
| 259 | .ca_mode = S_IRUGO }, |
| 260 | .show = comm_addr_list_read, |
| 261 | }; |
| 262 | |
| 263 | static struct configfs_attribute *comm_attrs[] = { |
| 264 | [COMM_ATTR_NODEID] = &comm_attr_nodeid.attr, |
| 265 | [COMM_ATTR_LOCAL] = &comm_attr_local.attr, |
| 266 | [COMM_ATTR_ADDR] = &comm_attr_addr.attr, |
| 267 | [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr, |
| 268 | NULL, |
| 269 | }; |
| 270 | |
| 271 | enum { |
| 272 | NODE_ATTR_NODEID = 0, |
| 273 | NODE_ATTR_WEIGHT, |
| 274 | }; |
| 275 | |
| 276 | struct node_attribute { |
| 277 | struct configfs_attribute attr; |
| 278 | ssize_t (*show)(struct dlm_node *, char *); |
| 279 | ssize_t (*store)(struct dlm_node *, const char *, size_t); |
| 280 | }; |
| 281 | |
| 282 | static struct node_attribute node_attr_nodeid = { |
| 283 | .attr = { .ca_owner = THIS_MODULE, |
| 284 | .ca_name = "nodeid", |
| 285 | .ca_mode = S_IRUGO | S_IWUSR }, |
| 286 | .show = node_nodeid_read, |
| 287 | .store = node_nodeid_write, |
| 288 | }; |
| 289 | |
| 290 | static struct node_attribute node_attr_weight = { |
| 291 | .attr = { .ca_owner = THIS_MODULE, |
| 292 | .ca_name = "weight", |
| 293 | .ca_mode = S_IRUGO | S_IWUSR }, |
| 294 | .show = node_weight_read, |
| 295 | .store = node_weight_write, |
| 296 | }; |
| 297 | |
| 298 | static struct configfs_attribute *node_attrs[] = { |
| 299 | [NODE_ATTR_NODEID] = &node_attr_nodeid.attr, |
| 300 | [NODE_ATTR_WEIGHT] = &node_attr_weight.attr, |
| 301 | NULL, |
| 302 | }; |
| 303 | |
| 304 | struct dlm_clusters { |
| 305 | struct configfs_subsystem subsys; |
| 306 | }; |
| 307 | |
| 308 | struct dlm_spaces { |
| 309 | struct config_group ss_group; |
| 310 | }; |
| 311 | |
| 312 | struct dlm_space { |
| 313 | struct config_group group; |
| 314 | struct list_head members; |
| 315 | struct mutex members_lock; |
| 316 | int members_count; |
| 317 | }; |
| 318 | |
| 319 | struct dlm_comms { |
| 320 | struct config_group cs_group; |
| 321 | }; |
| 322 | |
| 323 | struct dlm_comm { |
| 324 | struct config_item item; |
| 325 | int seq; |
| 326 | int nodeid; |
| 327 | int local; |
| 328 | int addr_count; |
| 329 | struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; |
| 330 | }; |
| 331 | |
| 332 | struct dlm_nodes { |
| 333 | struct config_group ns_group; |
| 334 | }; |
| 335 | |
| 336 | struct dlm_node { |
| 337 | struct config_item item; |
| 338 | struct list_head list; /* space->members */ |
| 339 | int nodeid; |
| 340 | int weight; |
| 341 | int new; |
| 342 | int comm_seq; /* copy of cm->seq when nd->nodeid is set */ |
| 343 | }; |
| 344 | |
| 345 | static struct configfs_group_operations clusters_ops = { |
| 346 | .make_group = make_cluster, |
| 347 | .drop_item = drop_cluster, |
| 348 | }; |
| 349 | |
| 350 | static struct configfs_item_operations cluster_ops = { |
| 351 | .release = release_cluster, |
| 352 | .show_attribute = show_cluster, |
| 353 | .store_attribute = store_cluster, |
| 354 | }; |
| 355 | |
| 356 | static struct configfs_group_operations spaces_ops = { |
| 357 | .make_group = make_space, |
| 358 | .drop_item = drop_space, |
| 359 | }; |
| 360 | |
| 361 | static struct configfs_item_operations space_ops = { |
| 362 | .release = release_space, |
| 363 | }; |
| 364 | |
| 365 | static struct configfs_group_operations comms_ops = { |
| 366 | .make_item = make_comm, |
| 367 | .drop_item = drop_comm, |
| 368 | }; |
| 369 | |
| 370 | static struct configfs_item_operations comm_ops = { |
| 371 | .release = release_comm, |
| 372 | .show_attribute = show_comm, |
| 373 | .store_attribute = store_comm, |
| 374 | }; |
| 375 | |
| 376 | static struct configfs_group_operations nodes_ops = { |
| 377 | .make_item = make_node, |
| 378 | .drop_item = drop_node, |
| 379 | }; |
| 380 | |
| 381 | static struct configfs_item_operations node_ops = { |
| 382 | .release = release_node, |
| 383 | .show_attribute = show_node, |
| 384 | .store_attribute = store_node, |
| 385 | }; |
| 386 | |
| 387 | static struct config_item_type clusters_type = { |
| 388 | .ct_group_ops = &clusters_ops, |
| 389 | .ct_owner = THIS_MODULE, |
| 390 | }; |
| 391 | |
| 392 | static struct config_item_type cluster_type = { |
| 393 | .ct_item_ops = &cluster_ops, |
| 394 | .ct_attrs = cluster_attrs, |
| 395 | .ct_owner = THIS_MODULE, |
| 396 | }; |
| 397 | |
| 398 | static struct config_item_type spaces_type = { |
| 399 | .ct_group_ops = &spaces_ops, |
| 400 | .ct_owner = THIS_MODULE, |
| 401 | }; |
| 402 | |
| 403 | static struct config_item_type space_type = { |
| 404 | .ct_item_ops = &space_ops, |
| 405 | .ct_owner = THIS_MODULE, |
| 406 | }; |
| 407 | |
| 408 | static struct config_item_type comms_type = { |
| 409 | .ct_group_ops = &comms_ops, |
| 410 | .ct_owner = THIS_MODULE, |
| 411 | }; |
| 412 | |
| 413 | static struct config_item_type comm_type = { |
| 414 | .ct_item_ops = &comm_ops, |
| 415 | .ct_attrs = comm_attrs, |
| 416 | .ct_owner = THIS_MODULE, |
| 417 | }; |
| 418 | |
| 419 | static struct config_item_type nodes_type = { |
| 420 | .ct_group_ops = &nodes_ops, |
| 421 | .ct_owner = THIS_MODULE, |
| 422 | }; |
| 423 | |
| 424 | static struct config_item_type node_type = { |
| 425 | .ct_item_ops = &node_ops, |
| 426 | .ct_attrs = node_attrs, |
| 427 | .ct_owner = THIS_MODULE, |
| 428 | }; |
| 429 | |
| 430 | static struct dlm_cluster *config_item_to_cluster(struct config_item *i) |
| 431 | { |
| 432 | return i ? container_of(to_config_group(i), struct dlm_cluster, group) : |
| 433 | NULL; |
| 434 | } |
| 435 | |
| 436 | static struct dlm_space *config_item_to_space(struct config_item *i) |
| 437 | { |
| 438 | return i ? container_of(to_config_group(i), struct dlm_space, group) : |
| 439 | NULL; |
| 440 | } |
| 441 | |
| 442 | static struct dlm_comm *config_item_to_comm(struct config_item *i) |
| 443 | { |
| 444 | return i ? container_of(i, struct dlm_comm, item) : NULL; |
| 445 | } |
| 446 | |
| 447 | static struct dlm_node *config_item_to_node(struct config_item *i) |
| 448 | { |
| 449 | return i ? container_of(i, struct dlm_node, item) : NULL; |
| 450 | } |
| 451 | |
| 452 | static struct config_group *make_cluster(struct config_group *g, |
| 453 | const char *name) |
| 454 | { |
| 455 | struct dlm_cluster *cl = NULL; |
| 456 | struct dlm_spaces *sps = NULL; |
| 457 | struct dlm_comms *cms = NULL; |
| 458 | void *gps = NULL; |
| 459 | |
| 460 | cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS); |
| 461 | gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS); |
| 462 | sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS); |
| 463 | cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS); |
| 464 | |
| 465 | if (!cl || !gps || !sps || !cms) |
| 466 | goto fail; |
| 467 | |
| 468 | config_group_init_type_name(&cl->group, name, &cluster_type); |
| 469 | config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type); |
| 470 | config_group_init_type_name(&cms->cs_group, "comms", &comms_type); |
| 471 | |
| 472 | cl->group.default_groups = gps; |
| 473 | cl->group.default_groups[0] = &sps->ss_group; |
| 474 | cl->group.default_groups[1] = &cms->cs_group; |
| 475 | cl->group.default_groups[2] = NULL; |
| 476 | |
| 477 | cl->cl_tcp_port = dlm_config.ci_tcp_port; |
| 478 | cl->cl_buffer_size = dlm_config.ci_buffer_size; |
| 479 | cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size; |
| 480 | cl->cl_recover_timer = dlm_config.ci_recover_timer; |
| 481 | cl->cl_toss_secs = dlm_config.ci_toss_secs; |
| 482 | cl->cl_scan_secs = dlm_config.ci_scan_secs; |
| 483 | cl->cl_log_debug = dlm_config.ci_log_debug; |
| 484 | cl->cl_protocol = dlm_config.ci_protocol; |
| 485 | cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs; |
| 486 | cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us; |
| 487 | cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count; |
| 488 | cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks; |
| 489 | memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name, |
| 490 | DLM_LOCKSPACE_LEN); |
| 491 | |
| 492 | space_list = &sps->ss_group; |
| 493 | comm_list = &cms->cs_group; |
| 494 | return &cl->group; |
| 495 | |
| 496 | fail: |
| 497 | kfree(cl); |
| 498 | kfree(gps); |
| 499 | kfree(sps); |
| 500 | kfree(cms); |
| 501 | return ERR_PTR(-ENOMEM); |
| 502 | } |
| 503 | |
| 504 | static void drop_cluster(struct config_group *g, struct config_item *i) |
| 505 | { |
| 506 | struct dlm_cluster *cl = config_item_to_cluster(i); |
| 507 | struct config_item *tmp; |
| 508 | int j; |
| 509 | |
| 510 | for (j = 0; cl->group.default_groups[j]; j++) { |
| 511 | tmp = &cl->group.default_groups[j]->cg_item; |
| 512 | cl->group.default_groups[j] = NULL; |
| 513 | config_item_put(tmp); |
| 514 | } |
| 515 | |
| 516 | space_list = NULL; |
| 517 | comm_list = NULL; |
| 518 | |
| 519 | config_item_put(i); |
| 520 | } |
| 521 | |
| 522 | static void release_cluster(struct config_item *i) |
| 523 | { |
| 524 | struct dlm_cluster *cl = config_item_to_cluster(i); |
| 525 | kfree(cl->group.default_groups); |
| 526 | kfree(cl); |
| 527 | } |
| 528 | |
| 529 | static struct config_group *make_space(struct config_group *g, const char *name) |
| 530 | { |
| 531 | struct dlm_space *sp = NULL; |
| 532 | struct dlm_nodes *nds = NULL; |
| 533 | void *gps = NULL; |
| 534 | |
| 535 | sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS); |
| 536 | gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS); |
| 537 | nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS); |
| 538 | |
| 539 | if (!sp || !gps || !nds) |
| 540 | goto fail; |
| 541 | |
| 542 | config_group_init_type_name(&sp->group, name, &space_type); |
| 543 | config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type); |
| 544 | |
| 545 | sp->group.default_groups = gps; |
| 546 | sp->group.default_groups[0] = &nds->ns_group; |
| 547 | sp->group.default_groups[1] = NULL; |
| 548 | |
| 549 | INIT_LIST_HEAD(&sp->members); |
| 550 | mutex_init(&sp->members_lock); |
| 551 | sp->members_count = 0; |
| 552 | return &sp->group; |
| 553 | |
| 554 | fail: |
| 555 | kfree(sp); |
| 556 | kfree(gps); |
| 557 | kfree(nds); |
| 558 | return ERR_PTR(-ENOMEM); |
| 559 | } |
| 560 | |
| 561 | static void drop_space(struct config_group *g, struct config_item *i) |
| 562 | { |
| 563 | struct dlm_space *sp = config_item_to_space(i); |
| 564 | struct config_item *tmp; |
| 565 | int j; |
| 566 | |
| 567 | /* assert list_empty(&sp->members) */ |
| 568 | |
| 569 | for (j = 0; sp->group.default_groups[j]; j++) { |
| 570 | tmp = &sp->group.default_groups[j]->cg_item; |
| 571 | sp->group.default_groups[j] = NULL; |
| 572 | config_item_put(tmp); |
| 573 | } |
| 574 | |
| 575 | config_item_put(i); |
| 576 | } |
| 577 | |
| 578 | static void release_space(struct config_item *i) |
| 579 | { |
| 580 | struct dlm_space *sp = config_item_to_space(i); |
| 581 | kfree(sp->group.default_groups); |
| 582 | kfree(sp); |
| 583 | } |
| 584 | |
| 585 | static struct config_item *make_comm(struct config_group *g, const char *name) |
| 586 | { |
| 587 | struct dlm_comm *cm; |
| 588 | |
| 589 | cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS); |
| 590 | if (!cm) |
| 591 | return ERR_PTR(-ENOMEM); |
| 592 | |
| 593 | config_item_init_type_name(&cm->item, name, &comm_type); |
| 594 | |
| 595 | cm->seq = dlm_comm_count++; |
| 596 | if (!cm->seq) |
| 597 | cm->seq = dlm_comm_count++; |
| 598 | |
| 599 | cm->nodeid = -1; |
| 600 | cm->local = 0; |
| 601 | cm->addr_count = 0; |
| 602 | return &cm->item; |
| 603 | } |
| 604 | |
| 605 | static void drop_comm(struct config_group *g, struct config_item *i) |
| 606 | { |
| 607 | struct dlm_comm *cm = config_item_to_comm(i); |
| 608 | if (local_comm == cm) |
| 609 | local_comm = NULL; |
| 610 | dlm_lowcomms_close(cm->nodeid); |
| 611 | while (cm->addr_count--) |
| 612 | kfree(cm->addr[cm->addr_count]); |
| 613 | config_item_put(i); |
| 614 | } |
| 615 | |
| 616 | static void release_comm(struct config_item *i) |
| 617 | { |
| 618 | struct dlm_comm *cm = config_item_to_comm(i); |
| 619 | kfree(cm); |
| 620 | } |
| 621 | |
| 622 | static struct config_item *make_node(struct config_group *g, const char *name) |
| 623 | { |
| 624 | struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent); |
| 625 | struct dlm_node *nd; |
| 626 | |
| 627 | nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS); |
| 628 | if (!nd) |
| 629 | return ERR_PTR(-ENOMEM); |
| 630 | |
| 631 | config_item_init_type_name(&nd->item, name, &node_type); |
| 632 | nd->nodeid = -1; |
| 633 | nd->weight = 1; /* default weight of 1 if none is set */ |
| 634 | nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */ |
| 635 | |
| 636 | mutex_lock(&sp->members_lock); |
| 637 | list_add(&nd->list, &sp->members); |
| 638 | sp->members_count++; |
| 639 | mutex_unlock(&sp->members_lock); |
| 640 | |
| 641 | return &nd->item; |
| 642 | } |
| 643 | |
| 644 | static void drop_node(struct config_group *g, struct config_item *i) |
| 645 | { |
| 646 | struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent); |
| 647 | struct dlm_node *nd = config_item_to_node(i); |
| 648 | |
| 649 | mutex_lock(&sp->members_lock); |
| 650 | list_del(&nd->list); |
| 651 | sp->members_count--; |
| 652 | mutex_unlock(&sp->members_lock); |
| 653 | |
| 654 | config_item_put(i); |
| 655 | } |
| 656 | |
| 657 | static void release_node(struct config_item *i) |
| 658 | { |
| 659 | struct dlm_node *nd = config_item_to_node(i); |
| 660 | kfree(nd); |
| 661 | } |
| 662 | |
| 663 | static struct dlm_clusters clusters_root = { |
| 664 | .subsys = { |
| 665 | .su_group = { |
| 666 | .cg_item = { |
| 667 | .ci_namebuf = "dlm", |
| 668 | .ci_type = &clusters_type, |
| 669 | }, |
| 670 | }, |
| 671 | }, |
| 672 | }; |
| 673 | |
| 674 | int __init dlm_config_init(void) |
| 675 | { |
| 676 | config_group_init(&clusters_root.subsys.su_group); |
| 677 | mutex_init(&clusters_root.subsys.su_mutex); |
| 678 | return configfs_register_subsystem(&clusters_root.subsys); |
| 679 | } |
| 680 | |
| 681 | void dlm_config_exit(void) |
| 682 | { |
| 683 | configfs_unregister_subsystem(&clusters_root.subsys); |
| 684 | } |
| 685 | |
| 686 | /* |
| 687 | * Functions for user space to read/write attributes |
| 688 | */ |
| 689 | |
| 690 | static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a, |
| 691 | char *buf) |
| 692 | { |
| 693 | struct dlm_cluster *cl = config_item_to_cluster(i); |
| 694 | struct cluster_attribute *cla = |
| 695 | container_of(a, struct cluster_attribute, attr); |
| 696 | return cla->show ? cla->show(cl, buf) : 0; |
| 697 | } |
| 698 | |
| 699 | static ssize_t store_cluster(struct config_item *i, |
| 700 | struct configfs_attribute *a, |
| 701 | const char *buf, size_t len) |
| 702 | { |
| 703 | struct dlm_cluster *cl = config_item_to_cluster(i); |
| 704 | struct cluster_attribute *cla = |
| 705 | container_of(a, struct cluster_attribute, attr); |
| 706 | return cla->store ? cla->store(cl, buf, len) : -EINVAL; |
| 707 | } |
| 708 | |
| 709 | static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a, |
| 710 | char *buf) |
| 711 | { |
| 712 | struct dlm_comm *cm = config_item_to_comm(i); |
| 713 | struct comm_attribute *cma = |
| 714 | container_of(a, struct comm_attribute, attr); |
| 715 | return cma->show ? cma->show(cm, buf) : 0; |
| 716 | } |
| 717 | |
| 718 | static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a, |
| 719 | const char *buf, size_t len) |
| 720 | { |
| 721 | struct dlm_comm *cm = config_item_to_comm(i); |
| 722 | struct comm_attribute *cma = |
| 723 | container_of(a, struct comm_attribute, attr); |
| 724 | return cma->store ? cma->store(cm, buf, len) : -EINVAL; |
| 725 | } |
| 726 | |
| 727 | static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf) |
| 728 | { |
| 729 | return sprintf(buf, "%d\n", cm->nodeid); |
| 730 | } |
| 731 | |
| 732 | static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf, |
| 733 | size_t len) |
| 734 | { |
| 735 | int rc = kstrtoint(buf, 0, &cm->nodeid); |
| 736 | |
| 737 | if (rc) |
| 738 | return rc; |
| 739 | return len; |
| 740 | } |
| 741 | |
| 742 | static ssize_t comm_local_read(struct dlm_comm *cm, char *buf) |
| 743 | { |
| 744 | return sprintf(buf, "%d\n", cm->local); |
| 745 | } |
| 746 | |
| 747 | static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf, |
| 748 | size_t len) |
| 749 | { |
| 750 | int rc = kstrtoint(buf, 0, &cm->local); |
| 751 | |
| 752 | if (rc) |
| 753 | return rc; |
| 754 | if (cm->local && !local_comm) |
| 755 | local_comm = cm; |
| 756 | return len; |
| 757 | } |
| 758 | |
| 759 | static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len) |
| 760 | { |
| 761 | struct sockaddr_storage *addr; |
| 762 | int rv; |
| 763 | |
| 764 | if (len != sizeof(struct sockaddr_storage)) |
| 765 | return -EINVAL; |
| 766 | |
| 767 | if (cm->addr_count >= DLM_MAX_ADDR_COUNT) |
| 768 | return -ENOSPC; |
| 769 | |
| 770 | addr = kzalloc(sizeof(*addr), GFP_NOFS); |
| 771 | if (!addr) |
| 772 | return -ENOMEM; |
| 773 | |
| 774 | memcpy(addr, buf, len); |
| 775 | |
| 776 | rv = dlm_lowcomms_addr(cm->nodeid, addr, len); |
| 777 | if (rv) { |
| 778 | kfree(addr); |
| 779 | return rv; |
| 780 | } |
| 781 | |
| 782 | cm->addr[cm->addr_count++] = addr; |
| 783 | return len; |
| 784 | } |
| 785 | |
| 786 | static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf) |
| 787 | { |
| 788 | ssize_t s; |
| 789 | ssize_t allowance; |
| 790 | int i; |
| 791 | struct sockaddr_storage *addr; |
| 792 | struct sockaddr_in *addr_in; |
| 793 | struct sockaddr_in6 *addr_in6; |
| 794 | |
| 795 | /* Taken from ip6_addr_string() defined in lib/vsprintf.c */ |
| 796 | char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")]; |
| 797 | |
| 798 | |
| 799 | /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */ |
| 800 | allowance = 4096; |
| 801 | buf[0] = '\0'; |
| 802 | |
| 803 | for (i = 0; i < cm->addr_count; i++) { |
| 804 | addr = cm->addr[i]; |
| 805 | |
| 806 | switch(addr->ss_family) { |
| 807 | case AF_INET: |
| 808 | addr_in = (struct sockaddr_in *)addr; |
| 809 | s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr); |
| 810 | break; |
| 811 | case AF_INET6: |
| 812 | addr_in6 = (struct sockaddr_in6 *)addr; |
| 813 | s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr); |
| 814 | break; |
| 815 | default: |
| 816 | s = sprintf(buf0, "%s\n", "<UNKNOWN>"); |
| 817 | break; |
| 818 | } |
| 819 | allowance -= s; |
| 820 | if (allowance >= 0) |
| 821 | strcat(buf, buf0); |
| 822 | else { |
| 823 | allowance += s; |
| 824 | break; |
| 825 | } |
| 826 | } |
| 827 | return 4096 - allowance; |
| 828 | } |
| 829 | |
| 830 | static ssize_t show_node(struct config_item *i, struct configfs_attribute *a, |
| 831 | char *buf) |
| 832 | { |
| 833 | struct dlm_node *nd = config_item_to_node(i); |
| 834 | struct node_attribute *nda = |
| 835 | container_of(a, struct node_attribute, attr); |
| 836 | return nda->show ? nda->show(nd, buf) : 0; |
| 837 | } |
| 838 | |
| 839 | static ssize_t store_node(struct config_item *i, struct configfs_attribute *a, |
| 840 | const char *buf, size_t len) |
| 841 | { |
| 842 | struct dlm_node *nd = config_item_to_node(i); |
| 843 | struct node_attribute *nda = |
| 844 | container_of(a, struct node_attribute, attr); |
| 845 | return nda->store ? nda->store(nd, buf, len) : -EINVAL; |
| 846 | } |
| 847 | |
| 848 | static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf) |
| 849 | { |
| 850 | return sprintf(buf, "%d\n", nd->nodeid); |
| 851 | } |
| 852 | |
| 853 | static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf, |
| 854 | size_t len) |
| 855 | { |
| 856 | uint32_t seq = 0; |
| 857 | int rc = kstrtoint(buf, 0, &nd->nodeid); |
| 858 | |
| 859 | if (rc) |
| 860 | return rc; |
| 861 | dlm_comm_seq(nd->nodeid, &seq); |
| 862 | nd->comm_seq = seq; |
| 863 | return len; |
| 864 | } |
| 865 | |
| 866 | static ssize_t node_weight_read(struct dlm_node *nd, char *buf) |
| 867 | { |
| 868 | return sprintf(buf, "%d\n", nd->weight); |
| 869 | } |
| 870 | |
| 871 | static ssize_t node_weight_write(struct dlm_node *nd, const char *buf, |
| 872 | size_t len) |
| 873 | { |
| 874 | int rc = kstrtoint(buf, 0, &nd->weight); |
| 875 | |
| 876 | if (rc) |
| 877 | return rc; |
| 878 | return len; |
| 879 | } |
| 880 | |
| 881 | /* |
| 882 | * Functions for the dlm to get the info that's been configured |
| 883 | */ |
| 884 | |
| 885 | static struct dlm_space *get_space(char *name) |
| 886 | { |
| 887 | struct config_item *i; |
| 888 | |
| 889 | if (!space_list) |
| 890 | return NULL; |
| 891 | |
| 892 | mutex_lock(&space_list->cg_subsys->su_mutex); |
| 893 | i = config_group_find_item(space_list, name); |
| 894 | mutex_unlock(&space_list->cg_subsys->su_mutex); |
| 895 | |
| 896 | return config_item_to_space(i); |
| 897 | } |
| 898 | |
| 899 | static void put_space(struct dlm_space *sp) |
| 900 | { |
| 901 | config_item_put(&sp->group.cg_item); |
| 902 | } |
| 903 | |
| 904 | static struct dlm_comm *get_comm(int nodeid) |
| 905 | { |
| 906 | struct config_item *i; |
| 907 | struct dlm_comm *cm = NULL; |
| 908 | int found = 0; |
| 909 | |
| 910 | if (!comm_list) |
| 911 | return NULL; |
| 912 | |
| 913 | mutex_lock(&clusters_root.subsys.su_mutex); |
| 914 | |
| 915 | list_for_each_entry(i, &comm_list->cg_children, ci_entry) { |
| 916 | cm = config_item_to_comm(i); |
| 917 | |
| 918 | if (cm->nodeid != nodeid) |
| 919 | continue; |
| 920 | found = 1; |
| 921 | config_item_get(i); |
| 922 | break; |
| 923 | } |
| 924 | mutex_unlock(&clusters_root.subsys.su_mutex); |
| 925 | |
| 926 | if (!found) |
| 927 | cm = NULL; |
| 928 | return cm; |
| 929 | } |
| 930 | |
| 931 | static void put_comm(struct dlm_comm *cm) |
| 932 | { |
| 933 | config_item_put(&cm->item); |
| 934 | } |
| 935 | |
| 936 | /* caller must free mem */ |
| 937 | int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out, |
| 938 | int *count_out) |
| 939 | { |
| 940 | struct dlm_space *sp; |
| 941 | struct dlm_node *nd; |
| 942 | struct dlm_config_node *nodes, *node; |
| 943 | int rv, count; |
| 944 | |
| 945 | sp = get_space(lsname); |
| 946 | if (!sp) |
| 947 | return -EEXIST; |
| 948 | |
| 949 | mutex_lock(&sp->members_lock); |
| 950 | if (!sp->members_count) { |
| 951 | rv = -EINVAL; |
| 952 | printk(KERN_ERR "dlm: zero members_count\n"); |
| 953 | goto out; |
| 954 | } |
| 955 | |
| 956 | count = sp->members_count; |
| 957 | |
| 958 | nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS); |
| 959 | if (!nodes) { |
| 960 | rv = -ENOMEM; |
| 961 | goto out; |
| 962 | } |
| 963 | |
| 964 | node = nodes; |
| 965 | list_for_each_entry(nd, &sp->members, list) { |
| 966 | node->nodeid = nd->nodeid; |
| 967 | node->weight = nd->weight; |
| 968 | node->new = nd->new; |
| 969 | node->comm_seq = nd->comm_seq; |
| 970 | node++; |
| 971 | |
| 972 | nd->new = 0; |
| 973 | } |
| 974 | |
| 975 | *count_out = count; |
| 976 | *nodes_out = nodes; |
| 977 | rv = 0; |
| 978 | out: |
| 979 | mutex_unlock(&sp->members_lock); |
| 980 | put_space(sp); |
| 981 | return rv; |
| 982 | } |
| 983 | |
| 984 | int dlm_comm_seq(int nodeid, uint32_t *seq) |
| 985 | { |
| 986 | struct dlm_comm *cm = get_comm(nodeid); |
| 987 | if (!cm) |
| 988 | return -EEXIST; |
| 989 | *seq = cm->seq; |
| 990 | put_comm(cm); |
| 991 | return 0; |
| 992 | } |
| 993 | |
| 994 | int dlm_our_nodeid(void) |
| 995 | { |
| 996 | return local_comm ? local_comm->nodeid : 0; |
| 997 | } |
| 998 | |
| 999 | /* num 0 is first addr, num 1 is second addr */ |
| 1000 | int dlm_our_addr(struct sockaddr_storage *addr, int num) |
| 1001 | { |
| 1002 | if (!local_comm) |
| 1003 | return -1; |
| 1004 | if (num + 1 > local_comm->addr_count) |
| 1005 | return -1; |
| 1006 | memcpy(addr, local_comm->addr[num], sizeof(*addr)); |
| 1007 | return 0; |
| 1008 | } |
| 1009 | |
| 1010 | /* Config file defaults */ |
| 1011 | #define DEFAULT_TCP_PORT 21064 |
| 1012 | #define DEFAULT_BUFFER_SIZE 4096 |
| 1013 | #define DEFAULT_RSBTBL_SIZE 1024 |
| 1014 | #define DEFAULT_RECOVER_TIMER 5 |
| 1015 | #define DEFAULT_TOSS_SECS 10 |
| 1016 | #define DEFAULT_SCAN_SECS 5 |
| 1017 | #define DEFAULT_LOG_DEBUG 0 |
| 1018 | #define DEFAULT_PROTOCOL 0 |
| 1019 | #define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */ |
| 1020 | #define DEFAULT_WAITWARN_US 0 |
| 1021 | #define DEFAULT_NEW_RSB_COUNT 128 |
| 1022 | #define DEFAULT_RECOVER_CALLBACKS 0 |
| 1023 | #define DEFAULT_CLUSTER_NAME "" |
| 1024 | |
| 1025 | struct dlm_config_info dlm_config = { |
| 1026 | .ci_tcp_port = DEFAULT_TCP_PORT, |
| 1027 | .ci_buffer_size = DEFAULT_BUFFER_SIZE, |
| 1028 | .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE, |
| 1029 | .ci_recover_timer = DEFAULT_RECOVER_TIMER, |
| 1030 | .ci_toss_secs = DEFAULT_TOSS_SECS, |
| 1031 | .ci_scan_secs = DEFAULT_SCAN_SECS, |
| 1032 | .ci_log_debug = DEFAULT_LOG_DEBUG, |
| 1033 | .ci_protocol = DEFAULT_PROTOCOL, |
| 1034 | .ci_timewarn_cs = DEFAULT_TIMEWARN_CS, |
| 1035 | .ci_waitwarn_us = DEFAULT_WAITWARN_US, |
| 1036 | .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT, |
| 1037 | .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS, |
| 1038 | .ci_cluster_name = DEFAULT_CLUSTER_NAME |
| 1039 | }; |
| 1040 | |