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 nv_add_int32(nvout, res->hr_workerpid, "workerpid%u", no); 275 276 switch (res->hr_role) { 277 case HAST_ROLE_PRIMARY: 278 PJDLOG_ASSERT(res->hr_workerpid != 0); 279 /* FALLTHROUGH */ 280 case HAST_ROLE_SECONDARY: 281 if (res->hr_workerpid != 0) 282 break; 283 /* FALLTHROUGH */ 284 default: 285 return; 286 } 287 288 /* 289 * If we are here, it means that we have a worker process, which we 290 * want to ask some questions. 291 */ 292 control_status_worker(res, nvout, no); 293 } 294 295 void 296 control_handle(struct hastd_config *cfg) 297 { 298 struct proto_conn *conn; 299 struct nv *nvin, *nvout; 300 unsigned int ii; 301 const char *str; 302 uint8_t cmd, role; 303 int error; 304 305 if (proto_accept(cfg->hc_controlconn, &conn) == -1) { 306 pjdlog_errno(LOG_ERR, "Unable to accept control connection"); 307 return; 308 } 309 310 cfg->hc_controlin = conn; 311 nvin = nvout = NULL; 312 role = HAST_ROLE_UNDEF; 313 314 if (hast_proto_recv_hdr(conn, &nvin) == -1) { 315 pjdlog_errno(LOG_ERR, "Unable to receive control header"); 316 nvin = NULL; 317 goto close; 318 } 319 320 /* Obtain command code. 0 means that nv_get_uint8() failed. */ 321 cmd = nv_get_uint8(nvin, "cmd"); 322 if (cmd == 0) { 323 pjdlog_error("Control header is missing 'cmd' field."); 324 goto close; 325 } 326 327 /* Allocate outgoing nv structure. */ 328 nvout = nv_alloc(); 329 if (nvout == NULL) { 330 pjdlog_error("Unable to allocate header for control response."); 331 goto close; 332 } 333 334 error = 0; 335 336 str = nv_get_string(nvin, "resource0"); 337 if (str == NULL) { 338 pjdlog_error("Control header is missing 'resource0' field."); 339 error = EHAST_INVALID; 340 goto fail; 341 } 342 if (cmd == HASTCTL_CMD_SETROLE) { 343 role = nv_get_uint8(nvin, "role"); 344 switch (role) { 345 case HAST_ROLE_INIT: 346 case HAST_ROLE_PRIMARY: 347 case HAST_ROLE_SECONDARY: 348 break; 349 default: 350 pjdlog_error("Invalid role received (%hhu).", role); 351 error = EHAST_INVALID; 352 goto fail; 353 } 354 } 355 if (strcmp(str, "all") == 0) { 356 struct hast_resource *res; 357 358 /* All configured resources. */ 359 360 ii = 0; 361 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 362 switch (cmd) { 363 case HASTCTL_CMD_SETROLE: 364 control_set_role_common(cfg, nvout, role, res, 365 res->hr_name, ii++); 366 break; 367 case HASTCTL_CMD_STATUS: 368 control_status(cfg, nvout, res, res->hr_name, 369 ii++); 370 break; 371 default: 372 pjdlog_error("Invalid command received (%hhu).", 373 cmd); 374 error = EHAST_UNIMPLEMENTED; 375 goto fail; 376 } 377 } 378 } else { 379 /* Only selected resources. */ 380 381 for (ii = 0; ; ii++) { 382 str = nv_get_string(nvin, "resource%u", ii); 383 if (str == NULL) 384 break; 385 switch (cmd) { 386 case HASTCTL_CMD_SETROLE: 387 control_set_role_common(cfg, nvout, role, NULL, 388 str, ii); 389 break; 390 case HASTCTL_CMD_STATUS: 391 control_status(cfg, nvout, NULL, str, ii); 392 break; 393 default: 394 pjdlog_error("Invalid command received (%hhu).", 395 cmd); 396 error = EHAST_UNIMPLEMENTED; 397 goto fail; 398 } 399 } 400 } 401 if (nv_error(nvout) != 0) 402 goto close; 403 fail: 404 if (error != 0) 405 nv_add_int16(nvout, error, "error"); 406 407 if (hast_proto_send(NULL, conn, nvout, NULL, 0) == -1) 408 pjdlog_errno(LOG_ERR, "Unable to send control response"); 409 close: 410 if (nvin != NULL) 411 nv_free(nvin); 412 if (nvout != NULL) 413 nv_free(nvout); 414 proto_close(conn); 415 cfg->hc_controlin = NULL; 416 } 417 418 /* 419 * Thread handles control requests from the parent. 420 */ 421 void * 422 ctrl_thread(void *arg) 423 { 424 struct hast_resource *res = arg; 425 struct nv *nvin, *nvout; 426 uint8_t cmd; 427 428 for (;;) { 429 if (hast_proto_recv_hdr(res->hr_ctrl, &nvin) == -1) { 430 if (sigexit_received) 431 pthread_exit(NULL); 432 pjdlog_errno(LOG_ERR, 433 "Unable to receive control message"); 434 kill(getpid(), SIGTERM); 435 pthread_exit(NULL); 436 } 437 cmd = nv_get_uint8(nvin, "cmd"); 438 if (cmd == 0) { 439 pjdlog_error("Control message is missing 'cmd' field."); 440 nv_free(nvin); 441 continue; 442 } 443 nvout = nv_alloc(); 444 switch (cmd) { 445 case CONTROL_STATUS: 446 if (res->hr_remotein != NULL && 447 res->hr_remoteout != NULL) { 448 nv_add_string(nvout, "complete", "status"); 449 } else { 450 nv_add_string(nvout, "degraded", "status"); 451 } 452 nv_add_uint32(nvout, (uint32_t)res->hr_extentsize, 453 "extentsize"); 454 if (res->hr_role == HAST_ROLE_PRIMARY) { 455 nv_add_uint32(nvout, 456 (uint32_t)res->hr_keepdirty, "keepdirty"); 457 nv_add_uint64(nvout, 458 (uint64_t)(activemap_ndirty(res->hr_amp) * 459 res->hr_extentsize), "dirty"); 460 } else { 461 nv_add_uint32(nvout, (uint32_t)0, "keepdirty"); 462 nv_add_uint64(nvout, (uint64_t)0, "dirty"); 463 } 464 nv_add_uint64(nvout, res->hr_stat_read, "stat_read"); 465 nv_add_uint64(nvout, res->hr_stat_write, "stat_write"); 466 nv_add_uint64(nvout, res->hr_stat_delete, 467 "stat_delete"); 468 nv_add_uint64(nvout, res->hr_stat_flush, "stat_flush"); 469 nv_add_uint64(nvout, res->hr_stat_activemap_update, 470 "stat_activemap_update"); 471 nv_add_uint64(nvout, res->hr_stat_read_error, 472 "stat_read_error"); 473 nv_add_uint64(nvout, res->hr_stat_write_error + 474 res->hr_stat_activemap_write_error, 475 "stat_write_error"); 476 nv_add_uint64(nvout, res->hr_stat_delete_error, 477 "stat_delete_error"); 478 nv_add_uint64(nvout, res->hr_stat_flush_error + 479 res->hr_stat_activemap_flush_error, 480 "stat_flush_error"); 481 nv_add_int16(nvout, 0, "error"); 482 break; 483 case CONTROL_RELOAD: 484 /* 485 * When parent receives SIGHUP and discovers that 486 * something related to us has changes, it sends reload 487 * message to us. 488 */ 489 PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY); 490 primary_config_reload(res, nvin); 491 nv_add_int16(nvout, 0, "error"); 492 break; 493 default: 494 nv_add_int16(nvout, EINVAL, "error"); 495 break; 496 } 497 nv_free(nvin); 498 if (nv_error(nvout) != 0) { 499 pjdlog_error("Unable to create answer on control message."); 500 nv_free(nvout); 501 continue; 502 } 503 if (hast_proto_send(NULL, res->hr_ctrl, nvout, NULL, 0) == -1) { 504 pjdlog_errno(LOG_ERR, 505 "Unable to send reply to control message"); 506 } 507 nv_free(nvout); 508 } 509 /* NOTREACHED */ 510 return (NULL); 511 } 512