1 /* 2 * QEMU storage daemon 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * Copyright (c) 2019 Kevin Wolf <kwolf@redhat.com> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 28 #include <getopt.h> 29 30 #include "block/block.h" 31 #include "block/nbd.h" 32 #include "chardev/char.h" 33 #include "crypto/init.h" 34 #include "monitor/monitor.h" 35 #include "monitor/monitor-internal.h" 36 37 #include "qapi/error.h" 38 #include "qapi/qapi-visit-block-core.h" 39 #include "qapi/qapi-visit-block-export.h" 40 #include "qapi/qapi-visit-control.h" 41 #include "qapi/qmp/qdict.h" 42 #include "qapi/qmp/qstring.h" 43 #include "qapi/qobject-input-visitor.h" 44 45 #include "qemu-common.h" 46 #include "qemu-version.h" 47 #include "qemu/config-file.h" 48 #include "qemu/error-report.h" 49 #include "qemu/help_option.h" 50 #include "qemu/log.h" 51 #include "qemu/main-loop.h" 52 #include "qemu/module.h" 53 #include "qemu/option.h" 54 #include "qom/object_interfaces.h" 55 56 #include "storage-daemon/qapi/qapi-commands.h" 57 #include "storage-daemon/qapi/qapi-init-commands.h" 58 59 #include "sysemu/runstate.h" 60 #include "trace/control.h" 61 62 static const char *pid_file; 63 static volatile bool exit_requested = false; 64 65 void qemu_system_killed(int signal, pid_t pid) 66 { 67 exit_requested = true; 68 } 69 70 void qmp_quit(Error **errp) 71 { 72 exit_requested = true; 73 } 74 75 static void help(void) 76 { 77 printf( 78 "Usage: %s [options]\n" 79 "QEMU storage daemon\n" 80 "\n" 81 " -h, --help display this help and exit\n" 82 " -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 83 " specify tracing options\n" 84 " -V, --version output version information and exit\n" 85 "\n" 86 " --blockdev [driver=]<driver>[,node-name=<N>][,discard=ignore|unmap]\n" 87 " [,cache.direct=on|off][,cache.no-flush=on|off]\n" 88 " [,read-only=on|off][,auto-read-only=on|off]\n" 89 " [,force-share=on|off][,detect-zeroes=on|off|unmap]\n" 90 " [,driver specific parameters...]\n" 91 " configure a block backend\n" 92 "\n" 93 " --chardev <options> configure a character device backend\n" 94 " (see the qemu(1) man page for possible options)\n" 95 "\n" 96 " --daemonize daemonize the process, and have the parent exit\n" 97 " once startup is complete\n" 98 "\n" 99 " --export [type=]nbd,id=<id>,node-name=<node-name>[,name=<export-name>]\n" 100 " [,writable=on|off][,bitmap=<name>]\n" 101 " export the specified block node over NBD\n" 102 " (requires --nbd-server)\n" 103 "\n" 104 #ifdef CONFIG_FUSE 105 " --export [type=]fuse,id=<id>,node-name=<node-name>,mountpoint=<file>\n" 106 " [,growable=on|off][,writable=on|off][,allow-other=on|off|auto]\n" 107 " export the specified block node over FUSE\n" 108 "\n" 109 #endif /* CONFIG_FUSE */ 110 #ifdef CONFIG_VHOST_USER_BLK_SERVER 111 " --export [type=]vhost-user-blk,id=<id>,node-name=<node-name>,\n" 112 " addr.type=unix,addr.path=<socket-path>[,writable=on|off]\n" 113 " [,logical-block-size=<block-size>][,num-queues=<num-queues>]\n" 114 " export the specified block node as a\n" 115 " vhost-user-blk device over UNIX domain socket\n" 116 " --export [type=]vhost-user-blk,id=<id>,node-name=<node-name>,\n" 117 " addr.type=fd,addr.str=<fd>[,writable=on|off]\n" 118 " [,logical-block-size=<block-size>][,num-queues=<num-queues>]\n" 119 " export the specified block node as a\n" 120 " vhost-user-blk device over file descriptor\n" 121 "\n" 122 #endif /* CONFIG_VHOST_USER_BLK_SERVER */ 123 " --monitor [chardev=]name[,mode=control][,pretty[=on|off]]\n" 124 " configure a QMP monitor\n" 125 "\n" 126 " --nbd-server addr.type=inet,addr.host=<host>,addr.port=<port>\n" 127 " [,tls-creds=<id>][,tls-authz=<id>][,max-connections=<n>]\n" 128 " --nbd-server addr.type=unix,addr.path=<path>\n" 129 " [,tls-creds=<id>][,tls-authz=<id>][,max-connections=<n>]\n" 130 " start an NBD server for exporting block nodes\n" 131 "\n" 132 " --object help list object types that can be added\n" 133 " --object <type>,help list properties for the given object type\n" 134 " --object <type>[,<property>=<value>...]\n" 135 " create a new object of type <type>, setting\n" 136 " properties in the order they are specified. Note\n" 137 " that the 'id' property must be set.\n" 138 " See the qemu(1) man page for documentation of the\n" 139 " objects that can be added.\n" 140 "\n" 141 " --pidfile <path> write process ID to a file after startup\n" 142 "\n" 143 QEMU_HELP_BOTTOM "\n", 144 g_get_prgname()); 145 } 146 147 enum { 148 OPTION_BLOCKDEV = 256, 149 OPTION_CHARDEV, 150 OPTION_DAEMONIZE, 151 OPTION_EXPORT, 152 OPTION_MONITOR, 153 OPTION_NBD_SERVER, 154 OPTION_OBJECT, 155 OPTION_PIDFILE, 156 }; 157 158 extern QemuOptsList qemu_chardev_opts; 159 160 static void init_qmp_commands(void) 161 { 162 qmp_init_marshal(&qmp_commands); 163 164 QTAILQ_INIT(&qmp_cap_negotiation_commands); 165 qmp_register_command(&qmp_cap_negotiation_commands, "qmp_capabilities", 166 qmp_marshal_qmp_capabilities, 167 QCO_ALLOW_PRECONFIG, 0); 168 } 169 170 static int getopt_set_loc(int argc, char **argv, const char *optstring, 171 const struct option *longopts) 172 { 173 int c, save_index; 174 175 optarg = NULL; 176 save_index = optind; 177 c = getopt_long(argc, argv, optstring, longopts, NULL); 178 if (optarg) { 179 loc_set_cmdline(argv, save_index, MAX(1, optind - save_index)); 180 } 181 return c; 182 } 183 184 /** 185 * Process QSD command-line arguments. 186 * 187 * This is done in two passes: 188 * 189 * First (@pre_init_pass is true), we do a pass where all global 190 * arguments pertaining to the QSD process (like --help or --daemonize) 191 * are processed. This pass is done before most of the QEMU-specific 192 * initialization steps (e.g. initializing the block layer or QMP), and 193 * so must only process arguments that are not really QEMU-specific. 194 * 195 * Second (@pre_init_pass is false), we (sequentially) process all 196 * QEMU/QSD-specific arguments. Many of these arguments are effectively 197 * translated to QMP commands (like --blockdev for blockdev-add, or 198 * --export for block-export-add). 199 */ 200 static void process_options(int argc, char *argv[], bool pre_init_pass) 201 { 202 int c; 203 204 static const struct option long_options[] = { 205 {"blockdev", required_argument, NULL, OPTION_BLOCKDEV}, 206 {"chardev", required_argument, NULL, OPTION_CHARDEV}, 207 {"daemonize", no_argument, NULL, OPTION_DAEMONIZE}, 208 {"export", required_argument, NULL, OPTION_EXPORT}, 209 {"help", no_argument, NULL, 'h'}, 210 {"monitor", required_argument, NULL, OPTION_MONITOR}, 211 {"nbd-server", required_argument, NULL, OPTION_NBD_SERVER}, 212 {"object", required_argument, NULL, OPTION_OBJECT}, 213 {"pidfile", required_argument, NULL, OPTION_PIDFILE}, 214 {"trace", required_argument, NULL, 'T'}, 215 {"version", no_argument, NULL, 'V'}, 216 {0, 0, 0, 0} 217 }; 218 219 /* 220 * In contrast to the system emulator, QEMU-specific options are processed 221 * in the order they are given on the command lines. This means that things 222 * must be defined first before they can be referenced in another option. 223 */ 224 optind = 1; 225 while ((c = getopt_set_loc(argc, argv, "-hT:V", long_options)) != -1) { 226 bool handle_option_pre_init; 227 228 /* Should this argument be processed in the pre-init pass? */ 229 handle_option_pre_init = 230 c == '?' || 231 c == 'h' || 232 c == 'V' || 233 c == OPTION_DAEMONIZE || 234 c == OPTION_PIDFILE; 235 236 /* Process every option only in its respective pass */ 237 if (pre_init_pass != handle_option_pre_init) { 238 continue; 239 } 240 241 switch (c) { 242 case '?': 243 exit(EXIT_FAILURE); 244 case 'h': 245 help(); 246 exit(EXIT_SUCCESS); 247 case 'T': 248 trace_opt_parse(optarg); 249 trace_init_file(); 250 break; 251 case 'V': 252 printf("qemu-storage-daemon version " 253 QEMU_FULL_VERSION "\n" QEMU_COPYRIGHT "\n"); 254 exit(EXIT_SUCCESS); 255 case OPTION_BLOCKDEV: 256 { 257 Visitor *v; 258 BlockdevOptions *options; 259 260 v = qobject_input_visitor_new_str(optarg, "driver", 261 &error_fatal); 262 263 visit_type_BlockdevOptions(v, NULL, &options, &error_fatal); 264 visit_free(v); 265 266 qmp_blockdev_add(options, &error_fatal); 267 qapi_free_BlockdevOptions(options); 268 break; 269 } 270 case OPTION_CHARDEV: 271 { 272 /* TODO This interface is not stable until we QAPIfy it */ 273 QemuOpts *opts = qemu_opts_parse_noisily(&qemu_chardev_opts, 274 optarg, true); 275 if (opts == NULL) { 276 exit(EXIT_FAILURE); 277 } 278 279 if (!qemu_chr_new_from_opts(opts, NULL, &error_fatal)) { 280 /* No error, but NULL returned means help was printed */ 281 exit(EXIT_SUCCESS); 282 } 283 qemu_opts_del(opts); 284 break; 285 } 286 case OPTION_DAEMONIZE: 287 if (os_set_daemonize(true) < 0) { 288 error_report("--daemonize not supported in this build"); 289 exit(EXIT_FAILURE); 290 } 291 break; 292 case OPTION_EXPORT: 293 { 294 Visitor *v; 295 BlockExportOptions *export; 296 297 v = qobject_input_visitor_new_str(optarg, "type", &error_fatal); 298 visit_type_BlockExportOptions(v, NULL, &export, &error_fatal); 299 visit_free(v); 300 301 qmp_block_export_add(export, &error_fatal); 302 qapi_free_BlockExportOptions(export); 303 break; 304 } 305 case OPTION_MONITOR: 306 { 307 Visitor *v; 308 MonitorOptions *monitor; 309 310 v = qobject_input_visitor_new_str(optarg, "chardev", 311 &error_fatal); 312 visit_type_MonitorOptions(v, NULL, &monitor, &error_fatal); 313 visit_free(v); 314 315 /* TODO Catch duplicate monitor IDs */ 316 monitor_init(monitor, false, &error_fatal); 317 qapi_free_MonitorOptions(monitor); 318 break; 319 } 320 case OPTION_NBD_SERVER: 321 { 322 Visitor *v; 323 NbdServerOptions *options; 324 325 v = qobject_input_visitor_new_str(optarg, NULL, &error_fatal); 326 visit_type_NbdServerOptions(v, NULL, &options, &error_fatal); 327 visit_free(v); 328 329 nbd_server_start_options(options, &error_fatal); 330 qapi_free_NbdServerOptions(options); 331 break; 332 } 333 case OPTION_OBJECT: 334 user_creatable_process_cmdline(optarg); 335 break; 336 case OPTION_PIDFILE: 337 pid_file = optarg; 338 break; 339 case 1: 340 error_report("Unexpected argument"); 341 exit(EXIT_FAILURE); 342 default: 343 g_assert_not_reached(); 344 } 345 } 346 loc_set_none(); 347 } 348 349 static void pid_file_cleanup(void) 350 { 351 unlink(pid_file); 352 } 353 354 static void pid_file_init(void) 355 { 356 Error *err = NULL; 357 358 if (!pid_file) { 359 return; 360 } 361 362 if (!qemu_write_pidfile(pid_file, &err)) { 363 error_reportf_err(err, "cannot create PID file: "); 364 exit(EXIT_FAILURE); 365 } 366 367 atexit(pid_file_cleanup); 368 } 369 370 int main(int argc, char *argv[]) 371 { 372 #ifdef CONFIG_POSIX 373 signal(SIGPIPE, SIG_IGN); 374 #endif 375 376 error_init(argv[0]); 377 qemu_init_exec_dir(argv[0]); 378 os_setup_signal_handling(); 379 380 process_options(argc, argv, true); 381 382 os_daemonize(); 383 384 module_call_init(MODULE_INIT_QOM); 385 module_call_init(MODULE_INIT_TRACE); 386 qemu_add_opts(&qemu_trace_opts); 387 qcrypto_init(&error_fatal); 388 bdrv_init(); 389 monitor_init_globals_core(); 390 init_qmp_commands(); 391 392 if (!trace_init_backends()) { 393 return EXIT_FAILURE; 394 } 395 qemu_set_log(LOG_TRACE); 396 397 qemu_init_main_loop(&error_fatal); 398 process_options(argc, argv, false); 399 400 /* 401 * Write the pid file after creating chardevs, exports, and NBD servers but 402 * before accepting connections. This ordering is documented. Do not change 403 * it. 404 */ 405 pid_file_init(); 406 os_setup_post(); 407 408 while (!exit_requested) { 409 main_loop_wait(false); 410 } 411 412 blk_exp_close_all(); 413 bdrv_drain_all_begin(); 414 job_cancel_sync_all(); 415 bdrv_close_all(); 416 417 monitor_cleanup(); 418 qemu_chr_cleanup(); 419 user_creatable_cleanup(); 420 421 return EXIT_SUCCESS; 422 } 423