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