1 /*- 2 * Copyright (c) 2009-2010 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Pawel Jakub Dawidek under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/types.h> 34 #include <sys/wait.h> 35 36 #include <errno.h> 37 #include <pthread.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "hast.h" 44 #include "hastd.h" 45 #include "hast_checksum.h" 46 #include "hast_compression.h" 47 #include "hast_proto.h" 48 #include "hooks.h" 49 #include "nv.h" 50 #include "pjdlog.h" 51 #include "proto.h" 52 #include "subr.h" 53 54 #include "control.h" 55 56 void 57 child_cleanup(struct hast_resource *res) 58 { 59 60 proto_close(res->hr_ctrl); 61 res->hr_ctrl = NULL; 62 if (res->hr_event != NULL) { 63 proto_close(res->hr_event); 64 res->hr_event = NULL; 65 } 66 if (res->hr_conn != NULL) { 67 proto_close(res->hr_conn); 68 res->hr_conn = NULL; 69 } 70 res->hr_workerpid = 0; 71 } 72 73 static void 74 control_set_role_common(struct hastd_config *cfg, struct nv *nvout, 75 uint8_t role, struct hast_resource *res, const char *name, unsigned int no) 76 { 77 int oldrole; 78 79 /* Name is always needed. */ 80 if (name != NULL) 81 nv_add_string(nvout, name, "resource%u", no); 82 83 if (res == NULL) { 84 PJDLOG_ASSERT(cfg != NULL); 85 PJDLOG_ASSERT(name != NULL); 86 87 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 88 if (strcmp(res->hr_name, name) == 0) 89 break; 90 } 91 if (res == NULL) { 92 nv_add_int16(nvout, EHAST_NOENTRY, "error%u", no); 93 return; 94 } 95 } 96 PJDLOG_ASSERT(res != NULL); 97 98 /* Send previous role back. */ 99 nv_add_string(nvout, role2str(res->hr_role), "role%u", no); 100 101 /* Nothing changed, return here. */ 102 if (role == res->hr_role) 103 return; 104 105 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 106 pjdlog_info("Role changed to %s.", role2str(role)); 107 108 /* Change role to the new one. */ 109 oldrole = res->hr_role; 110 res->hr_role = role; 111 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 112 113 /* 114 * If previous role was primary or secondary we have to kill process 115 * doing that work. 116 */ 117 if (res->hr_workerpid != 0) { 118 if (kill(res->hr_workerpid, SIGTERM) == -1) { 119 pjdlog_errno(LOG_WARNING, 120 "Unable to kill worker process %u", 121 (unsigned int)res->hr_workerpid); 122 } else if (waitpid(res->hr_workerpid, NULL, 0) != 123 res->hr_workerpid) { 124 pjdlog_errno(LOG_WARNING, 125 "Error while waiting for worker process %u", 126 (unsigned int)res->hr_workerpid); 127 } else { 128 pjdlog_debug(1, "Worker process %u stopped.", 129 (unsigned int)res->hr_workerpid); 130 } 131 child_cleanup(res); 132 } 133 134 /* Start worker process if we are changing to primary. */ 135 if (role == HAST_ROLE_PRIMARY) 136 hastd_primary(res); 137 pjdlog_prefix_set("%s", ""); 138 hook_exec(res->hr_exec, "role", res->hr_name, role2str(oldrole), 139 role2str(res->hr_role), NULL); 140 } 141 142 void 143 control_set_role(struct hast_resource *res, uint8_t role) 144 { 145 146 control_set_role_common(NULL, NULL, role, res, NULL, 0); 147 } 148 149 static void 150 control_status_worker(struct hast_resource *res, struct nv *nvout, 151 unsigned int no) 152 { 153 struct nv *cnvin, *cnvout; 154 const char *str; 155 int error; 156 157 cnvin = NULL; 158 159 /* 160 * Prepare and send command to worker process. 161 */ 162 cnvout = nv_alloc(); 163 nv_add_uint8(cnvout, CONTROL_STATUS, "cmd"); 164 error = nv_error(cnvout); 165 if (error != 0) { 166 pjdlog_common(LOG_ERR, 0, error, 167 "Unable to prepare control header"); 168 goto end; 169 } 170 if (hast_proto_send(res, res->hr_ctrl, cnvout, NULL, 0) == -1) { 171 error = errno; 172 pjdlog_errno(LOG_ERR, "Unable to send control header"); 173 goto end; 174 } 175 176 /* 177 * Receive response. 178 */ 179 if (hast_proto_recv_hdr(res->hr_ctrl, &cnvin) == -1) { 180 error = errno; 181 pjdlog_errno(LOG_ERR, "Unable to receive control header"); 182 goto end; 183 } 184 185 error = nv_get_int16(cnvin, "error"); 186 if (error != 0) 187 goto end; 188 189 if ((str = nv_get_string(cnvin, "status")) == NULL) { 190 error = ENOENT; 191 pjdlog_errno(LOG_ERR, "Field 'status' is missing."); 192 goto end; 193 } 194 nv_add_string(nvout, str, "status%u", no); 195 nv_add_uint64(nvout, nv_get_uint64(cnvin, "dirty"), "dirty%u", no); 196 nv_add_uint32(nvout, nv_get_uint32(cnvin, "extentsize"), 197 "extentsize%u", no); 198 nv_add_uint32(nvout, nv_get_uint32(cnvin, "keepdirty"), 199 "keepdirty%u", no); 200 nv_add_uint64(nvout, nv_get_uint64(cnvin, "stat_read"), 201 "stat_read%u", no); 202 nv_add_uint64(nvout, nv_get_uint64(cnvin, "stat_write"), 203 "stat_write%u", no); 204 nv_add_uint64(nvout, nv_get_uint64(cnvin, "stat_delete"), 205 "stat_delete%u", no); 206 nv_add_uint64(nvout, nv_get_uint64(cnvin, "stat_flush"), 207 "stat_flush%u", no); 208 nv_add_uint64(nvout, nv_get_uint64(cnvin, "stat_activemap_update"), 209 "stat_activemap_update%u", no); 210 nv_add_uint64(nvout, nv_get_uint64(cnvin, "stat_read_error"), 211 "stat_read_error%u", no); 212 nv_add_uint64(nvout, nv_get_uint64(cnvin, "stat_write_error"), 213 "stat_write_error%u", no); 214 nv_add_uint64(nvout, nv_get_uint64(cnvin, "stat_delete_error"), 215 "stat_delete_error%u", no); 216 nv_add_uint64(nvout, nv_get_uint64(cnvin, "stat_flush_error"), 217 "stat_flush_error%u", no); 218 end: 219 if (cnvin != NULL) 220 nv_free(cnvin); 221 if (cnvout != NULL) 222 nv_free(cnvout); 223 if (error != 0) 224 nv_add_int16(nvout, error, "error"); 225 } 226 227 static void 228 control_status(struct hastd_config *cfg, struct nv *nvout, 229 struct hast_resource *res, const char *name, unsigned int no) 230 { 231 232 PJDLOG_ASSERT(cfg != NULL); 233 PJDLOG_ASSERT(nvout != NULL); 234 PJDLOG_ASSERT(name != NULL); 235 236 /* Name is always needed. */ 237 nv_add_string(nvout, name, "resource%u", no); 238 239 if (res == NULL) { 240 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 241 if (strcmp(res->hr_name, name) == 0) 242 break; 243 } 244 if (res == NULL) { 245 nv_add_int16(nvout, EHAST_NOENTRY, "error%u", no); 246 return; 247 } 248 } 249 PJDLOG_ASSERT(res != NULL); 250 nv_add_string(nvout, res->hr_provname, "provname%u", no); 251 nv_add_string(nvout, res->hr_localpath, "localpath%u", no); 252 nv_add_string(nvout, res->hr_remoteaddr, "remoteaddr%u", no); 253 if (res->hr_sourceaddr[0] != '\0') 254 nv_add_string(nvout, res->hr_sourceaddr, "sourceaddr%u", no); 255 switch (res->hr_replication) { 256 case HAST_REPLICATION_FULLSYNC: 257 nv_add_string(nvout, "fullsync", "replication%u", no); 258 break; 259 case HAST_REPLICATION_MEMSYNC: 260 nv_add_string(nvout, "memsync", "replication%u", no); 261 break; 262 case HAST_REPLICATION_ASYNC: 263 nv_add_string(nvout, "async", "replication%u", no); 264 break; 265 default: 266 nv_add_string(nvout, "unknown", "replication%u", no); 267 break; 268 } 269 nv_add_string(nvout, checksum_name(res->hr_checksum), 270 "checksum%u", no); 271 nv_add_string(nvout, compression_name(res->hr_compression), 272 "compression%u", no); 273 nv_add_string(nvout, role2str(res->hr_role), "role%u", no); 274 275 switch (res->hr_role) { 276 case HAST_ROLE_PRIMARY: 277 PJDLOG_ASSERT(res->hr_workerpid != 0); 278 /* FALLTHROUGH */ 279 case HAST_ROLE_SECONDARY: 280 if (res->hr_workerpid != 0) 281 break; 282 /* FALLTHROUGH */ 283 default: 284 return; 285 } 286 287 /* 288 * If we are here, it means that we have a worker process, which we 289 * want to ask some questions. 290 */ 291 control_status_worker(res, nvout, no); 292 } 293 294 void 295 control_handle(struct hastd_config *cfg) 296 { 297 struct proto_conn *conn; 298 struct nv *nvin, *nvout; 299 unsigned int ii; 300 const char *str; 301 uint8_t cmd, role; 302 int error; 303 304 if (proto_accept(cfg->hc_controlconn, &conn) == -1) { 305 pjdlog_errno(LOG_ERR, "Unable to accept control connection"); 306 return; 307 } 308 309 cfg->hc_controlin = conn; 310 nvin = nvout = NULL; 311 role = HAST_ROLE_UNDEF; 312 313 if (hast_proto_recv_hdr(conn, &nvin) == -1) { 314 pjdlog_errno(LOG_ERR, "Unable to receive control header"); 315 nvin = NULL; 316 goto close; 317 } 318 319 /* Obtain command code. 0 means that nv_get_uint8() failed. */ 320 cmd = nv_get_uint8(nvin, "cmd"); 321 if (cmd == 0) { 322 pjdlog_error("Control header is missing 'cmd' field."); 323 goto close; 324 } 325 326 /* Allocate outgoing nv structure. */ 327 nvout = nv_alloc(); 328 if (nvout == NULL) { 329 pjdlog_error("Unable to allocate header for control response."); 330 goto close; 331 } 332 333 error = 0; 334 335 str = nv_get_string(nvin, "resource0"); 336 if (str == NULL) { 337 pjdlog_error("Control header is missing 'resource0' field."); 338 error = EHAST_INVALID; 339 goto fail; 340 } 341 if (cmd == HASTCTL_CMD_SETROLE) { 342 role = nv_get_uint8(nvin, "role"); 343 switch (role) { 344 case HAST_ROLE_INIT: 345 case HAST_ROLE_PRIMARY: 346 case HAST_ROLE_SECONDARY: 347 break; 348 default: 349 pjdlog_error("Invalid role received (%hhu).", role); 350 error = EHAST_INVALID; 351 goto fail; 352 } 353 } 354 if (strcmp(str, "all") == 0) { 355 struct hast_resource *res; 356 357 /* All configured resources. */ 358 359 ii = 0; 360 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 361 switch (cmd) { 362 case HASTCTL_CMD_SETROLE: 363 control_set_role_common(cfg, nvout, role, res, 364 res->hr_name, ii++); 365 break; 366 case HASTCTL_CMD_STATUS: 367 control_status(cfg, nvout, res, res->hr_name, 368 ii++); 369 break; 370 default: 371 pjdlog_error("Invalid command received (%hhu).", 372 cmd); 373 error = EHAST_UNIMPLEMENTED; 374 goto fail; 375 } 376 } 377 } else { 378 /* Only selected resources. */ 379 380 for (ii = 0; ; ii++) { 381 str = nv_get_string(nvin, "resource%u", ii); 382 if (str == NULL) 383 break; 384 switch (cmd) { 385 case HASTCTL_CMD_SETROLE: 386 control_set_role_common(cfg, nvout, role, NULL, 387 str, ii); 388 break; 389 case HASTCTL_CMD_STATUS: 390 control_status(cfg, nvout, NULL, str, ii); 391 break; 392 default: 393 pjdlog_error("Invalid command received (%hhu).", 394 cmd); 395 error = EHAST_UNIMPLEMENTED; 396 goto fail; 397 } 398 } 399 } 400 if (nv_error(nvout) != 0) 401 goto close; 402 fail: 403 if (error != 0) 404 nv_add_int16(nvout, error, "error"); 405 406 if (hast_proto_send(NULL, conn, nvout, NULL, 0) == -1) 407 pjdlog_errno(LOG_ERR, "Unable to send control response"); 408 close: 409 if (nvin != NULL) 410 nv_free(nvin); 411 if (nvout != NULL) 412 nv_free(nvout); 413 proto_close(conn); 414 cfg->hc_controlin = NULL; 415 } 416 417 /* 418 * Thread handles control requests from the parent. 419 */ 420 void * 421 ctrl_thread(void *arg) 422 { 423 struct hast_resource *res = arg; 424 struct nv *nvin, *nvout; 425 uint8_t cmd; 426 427 for (;;) { 428 if (hast_proto_recv_hdr(res->hr_ctrl, &nvin) == -1) { 429 if (sigexit_received) 430 pthread_exit(NULL); 431 pjdlog_errno(LOG_ERR, 432 "Unable to receive control message"); 433 kill(getpid(), SIGTERM); 434 pthread_exit(NULL); 435 } 436 cmd = nv_get_uint8(nvin, "cmd"); 437 if (cmd == 0) { 438 pjdlog_error("Control message is missing 'cmd' field."); 439 nv_free(nvin); 440 continue; 441 } 442 nvout = nv_alloc(); 443 switch (cmd) { 444 case CONTROL_STATUS: 445 if (res->hr_remotein != NULL && 446 res->hr_remoteout != NULL) { 447 nv_add_string(nvout, "complete", "status"); 448 } else { 449 nv_add_string(nvout, "degraded", "status"); 450 } 451 nv_add_uint32(nvout, (uint32_t)res->hr_extentsize, 452 "extentsize"); 453 if (res->hr_role == HAST_ROLE_PRIMARY) { 454 nv_add_uint32(nvout, 455 (uint32_t)res->hr_keepdirty, "keepdirty"); 456 nv_add_uint64(nvout, 457 (uint64_t)(activemap_ndirty(res->hr_amp) * 458 res->hr_extentsize), "dirty"); 459 } else { 460 nv_add_uint32(nvout, (uint32_t)0, "keepdirty"); 461 nv_add_uint64(nvout, (uint64_t)0, "dirty"); 462 } 463 nv_add_uint64(nvout, res->hr_stat_read, "stat_read"); 464 nv_add_uint64(nvout, res->hr_stat_write, "stat_write"); 465 nv_add_uint64(nvout, res->hr_stat_delete, 466 "stat_delete"); 467 nv_add_uint64(nvout, res->hr_stat_flush, "stat_flush"); 468 nv_add_uint64(nvout, res->hr_stat_activemap_update, 469 "stat_activemap_update"); 470 nv_add_uint64(nvout, res->hr_stat_read_error, 471 "stat_read_error"); 472 nv_add_uint64(nvout, res->hr_stat_write_error + 473 res->hr_stat_activemap_write_error, 474 "stat_write_error"); 475 nv_add_uint64(nvout, res->hr_stat_delete_error, 476 "stat_delete_error"); 477 nv_add_uint64(nvout, res->hr_stat_flush_error + 478 res->hr_stat_activemap_flush_error, 479 "stat_flush_error"); 480 nv_add_int16(nvout, 0, "error"); 481 break; 482 case CONTROL_RELOAD: 483 /* 484 * When parent receives SIGHUP and discovers that 485 * something related to us has changes, it sends reload 486 * message to us. 487 */ 488 PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY); 489 primary_config_reload(res, nvin); 490 nv_add_int16(nvout, 0, "error"); 491 break; 492 default: 493 nv_add_int16(nvout, EINVAL, "error"); 494 break; 495 } 496 nv_free(nvin); 497 if (nv_error(nvout) != 0) { 498 pjdlog_error("Unable to create answer on control message."); 499 nv_free(nvout); 500 continue; 501 } 502 if (hast_proto_send(NULL, res->hr_ctrl, nvout, NULL, 0) == -1) { 503 pjdlog_errno(LOG_ERR, 504 "Unable to send reply to control message"); 505 } 506 nv_free(nvout); 507 } 508 /* NOTREACHED */ 509 return (NULL); 510 } 511