src/machine/machine.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <unistd.h>
   5 #include <sys/stat.h>
   6
   7 #include "sd-messages.h"
   8
   9 #include "alloc-util.h"
  10 #include "bus-error.h"
  11 #include "bus-util.h"
  12 #include "env-file.h"
  13 #include "errno-util.h"
  14 #include "escape.h"
  15 #include "extract-word.h"
  16 #include "fd-util.h"
  17 #include "fileio.h"
  18 #include "format-util.h"
  19 #include "hashmap.h"
  20 #include "machine-dbus.h"
  21 #include "machine.h"
  22 #include "mkdir.h"
  23 #include "parse-util.h"
  24 #include "path-util.h"
  25 #include "process-util.h"
  26 #include "serialize.h"
  27 #include "special.h"
  28 #include "stdio-util.h"
  29 #include "string-table.h"
  30 #include "terminal-util.h"
  31 #include "tmpfile-util.h"
  32 #include "unit-name.h"
  33 #include "user-util.h"
  34 #include "util.h"
  35
  36 Machine* machine_new(Manager *manager, MachineClass class, const char *name) {
  37         Machine *m;
  38
  39         assert(manager);
  40         assert(class < _MACHINE_CLASS_MAX);
  41         assert(name);
  42
  43         /* Passing class == _MACHINE_CLASS_INVALID here is fine. It
  44          * means as much as "we don't know yet", and that we'll figure
  45          * it out later when loading the state file. */
  46
  47         m = new0(Machine, 1);
  48         if (!m)
  49                 return NULL;
  50
  51         m->name = strdup(name);
  52         if (!m->name)
  53                 goto fail;
  54
  55         if (class != MACHINE_HOST) {
  56                 m->state_file = path_join("/run/systemd/machines", m->name);
  57                 if (!m->state_file)
  58                         goto fail;
  59         }
  60
  61         m->class = class;
  62
  63         if (hashmap_put(manager->machines, m->name, m) < 0)
  64                 goto fail;
  65
  66         m->manager = manager;
  67
  68         return m;
  69
  70 fail:
  71         free(m->state_file);
  72         free(m->name);
  73         return mfree(m);
  74 }
  75
  76 Machine* machine_free(Machine *m) {
  77         if (!m)
  78                 return NULL;
  79
  80         while (m->operations)
  81                 operation_free(m->operations);
  82
  83         if (m->in_gc_queue)
  84                 LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m);
  85
  86         machine_release_unit(m);
  87
  88         free(m->scope_job);
  89
  90         (void) hashmap_remove(m->manager->machines, m->name);
  91
  92         if (m->manager->host_machine == m)
  93                 m->manager->host_machine = NULL;
  94
  95         if (m->leader > 0)
  96                 (void) hashmap_remove_value(m->manager->machine_leaders, PID_TO_PTR(m->leader), m);
  97
  98         sd_bus_message_unref(m->create_message);
  99
 100         free(m->name);
 101         free(m->state_file);
 102         free(m->service);
 103         free(m->root_directory);
 104         free(m->netif);
 105         return mfree(m);
 106 }
 107
 108 int machine_save(Machine *m) {
 109         _cleanup_free_ char *temp_path = NULL;
 110         _cleanup_fclose_ FILE *f = NULL;
 111         int r;
 112
 113         assert(m);
 114
 115         if (!m->state_file)
 116                 return 0;
 117
 118         if (!m->started)
 119                 return 0;
 120
 121         r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0, MKDIR_WARN_MODE);
 122         if (r < 0)
 123                 goto fail;
 124
 125         r = fopen_temporary(m->state_file, &f, &temp_path);
 126         if (r < 0)
 127                 goto fail;
 128
 129         (void) fchmod(fileno(f), 0644);
 130
 131         fprintf(f,
 132                 "# This is private data. Do not parse.\n"
 133                 "NAME=%s\n",
 134                 m->name);
 135
 136         if (m->unit) {
 137                 _cleanup_free_ char *escaped;
 138
 139                 escaped = cescape(m->unit);
 140                 if (!escaped) {
 141                         r = -ENOMEM;
 142                         goto fail;
 143                 }
 144
 145                 fprintf(f, "SCOPE=%s\n", escaped); /* We continue to call this "SCOPE=" because it is internal only, and we want to stay compatible with old files */
 146         }
 147
 148         if (m->scope_job)
 149                 fprintf(f, "SCOPE_JOB=%s\n", m->scope_job);
 150
 151         if (m->service) {
 152                 _cleanup_free_ char *escaped;
 153
 154                 escaped = cescape(m->service);
 155                 if (!escaped) {
 156                         r = -ENOMEM;
 157                         goto fail;
 158                 }
 159                 fprintf(f, "SERVICE=%s\n", escaped);
 160         }
 161
 162         if (m->root_directory) {
 163                 _cleanup_free_ char *escaped;
 164
 165                 escaped = cescape(m->root_directory);
 166                 if (!escaped) {
 167                         r = -ENOMEM;
 168                         goto fail;
 169                 }
 170                 fprintf(f, "ROOT=%s\n", escaped);
 171         }
 172
 173         if (!sd_id128_is_null(m->id))
 174                 fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id));
 175
 176         if (m->leader != 0)
 177                 fprintf(f, "LEADER="PID_FMT"\n", m->leader);
 178
 179         if (m->class != _MACHINE_CLASS_INVALID)
 180                 fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class));
 181
 182         if (dual_timestamp_is_set(&m->timestamp))
 183                 fprintf(f,
 184                         "REALTIME="USEC_FMT"\n"
 185                         "MONOTONIC="USEC_FMT"\n",
 186                         m->timestamp.realtime,
 187                         m->timestamp.monotonic);
 188
 189         if (m->n_netif > 0) {
 190                 size_t i;
 191
 192                 fputs("NETIF=", f);
 193
 194                 for (i = 0; i < m->n_netif; i++) {
 195                         if (i != 0)
 196                                 fputc(' ', f);
 197
 198                         fprintf(f, "%i", m->netif[i]);
 199                 }
 200
 201                 fputc('\n', f);
 202         }
 203
 204         r = fflush_and_check(f);
 205         if (r < 0)
 206                 goto fail;
 207
 208         if (rename(temp_path, m->state_file) < 0) {
 209                 r = -errno;
 210                 goto fail;
 211         }
 212
 213         if (m->unit) {
 214                 char *sl;
 215
 216                 /* Create a symlink from the unit name to the machine
 217                  * name, so that we can quickly find the machine for
 218                  * each given unit. Ignore error. */
 219                 sl = strjoina("/run/systemd/machines/unit:", m->unit);
 220                 (void) symlink(m->name, sl);
 221         }
 222
 223         return 0;
 224
 225 fail:
 226         (void) unlink(m->state_file);
 227
 228         if (temp_path)
 229                 (void) unlink(temp_path);
 230
 231         return log_error_errno(r, "Failed to save machine data %s: %m", m->state_file);
 232 }
 233
 234 static void machine_unlink(Machine *m) {
 235         assert(m);
 236
 237         if (m->unit) {
 238                 char *sl;
 239
 240                 sl = strjoina("/run/systemd/machines/unit:", m->unit);
 241                 (void) unlink(sl);
 242         }
 243
 244         if (m->state_file)
 245                 (void) unlink(m->state_file);
 246 }
 247
 248 int machine_load(Machine *m) {
 249         _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL, *netif = NULL;
 250         int r;
 251
 252         assert(m);
 253
 254         if (!m->state_file)
 255                 return 0;
 256
 257         r = parse_env_file(NULL, m->state_file,
 258                            "SCOPE",     &m->unit,
 259                            "SCOPE_JOB", &m->scope_job,
 260                            "SERVICE",   &m->service,
 261                            "ROOT",      &m->root_directory,
 262                            "ID",        &id,
 263                            "LEADER",    &leader,
 264                            "CLASS",     &class,
 265                            "REALTIME",  &realtime,
 266                            "MONOTONIC", &monotonic,
 267                            "NETIF",     &netif);
 268         if (r < 0) {
 269                 if (r == -ENOENT)
 270                         return 0;
 271
 272                 return log_error_errno(r, "Failed to read %s: %m", m->state_file);
 273         }
 274
 275         if (id)
 276                 sd_id128_from_string(id, &m->id);
 277
 278         if (leader)
 279                 parse_pid(leader, &m->leader);
 280
 281         if (class) {
 282                 MachineClass c;
 283
 284                 c = machine_class_from_string(class);
 285                 if (c >= 0)
 286                         m->class = c;
 287         }
 288
 289         if (realtime)
 290                 (void) deserialize_usec(realtime, &m->timestamp.realtime);
 291         if (monotonic)
 292                 (void) deserialize_usec(monotonic, &m->timestamp.monotonic);
 293
 294         if (netif) {
 295                 size_t allocated = 0, nr = 0;
 296                 const char *p;
 297                 int *ni = NULL;
 298
 299                 p = netif;
 300                 for (;;) {
 301                         _cleanup_free_ char *word = NULL;
 302                         int ifi;
 303
 304                         r = extract_first_word(&p, &word, NULL, 0);
 305                         if (r == 0)
 306                                 break;
 307                         if (r == -ENOMEM)
 308                                 return log_oom();
 309                         if (r < 0) {
 310                                 log_warning_errno(r, "Failed to parse NETIF: %s", netif);
 311                                 break;
 312                         }
 313
 314                         if (parse_ifindex(word, &ifi) < 0)
 315                                 continue;
 316
 317                         if (!GREEDY_REALLOC(ni, allocated, nr+1)) {
 318                                 free(ni);
 319                                 return log_oom();
 320                         }
 321
 322                         ni[nr++] = ifi;
 323                 }
 324
 325                 free(m->netif);
 326                 m->netif = ni;
 327                 m->n_netif = nr;
 328         }
 329
 330         return r;
 331 }
 332
 333 static int machine_start_scope(
 334                 Machine *machine,
 335                 sd_bus_message *more_properties,
 336                 sd_bus_error *error) {
 337
 338         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL;
 339         _cleanup_free_ char *escaped = NULL, *unit = NULL;
 340         const char *description;
 341         int r;
 342
 343         assert(machine);
 344         assert(machine->leader > 0);
 345         assert(!machine->unit);
 346
 347         escaped = unit_name_escape(machine->name);
 348         if (!escaped)
 349                 return log_oom();
 350
 351         unit = strjoin("machine-", escaped, ".scope");
 352         if (!unit)
 353                 return log_oom();
 354
 355         r = sd_bus_message_new_method_call(
 356                         machine->manager->bus,
 357                         &m,
 358                         "org.freedesktop.systemd1",
 359                         "/org/freedesktop/systemd1",
 360                         "org.freedesktop.systemd1.Manager",
 361                         "StartTransientUnit");
 362         if (r < 0)
 363                 return r;
 364
 365         r = sd_bus_message_append(m, "ss", unit, "fail");
 366         if (r < 0)
 367                 return r;
 368
 369         r = sd_bus_message_open_container(m, 'a', "(sv)");
 370         if (r < 0)
 371                 return r;
 372
 373         r = sd_bus_message_append(m, "(sv)", "Slice", "s", SPECIAL_MACHINE_SLICE);
 374         if (r < 0)
 375                 return r;
 376
 377         description = strjoina(machine->class == MACHINE_VM ? "Virtual Machine " : "Container ", machine->name);
 378         r = sd_bus_message_append(m, "(sv)", "Description", "s", description);
 379         if (r < 0)
 380                 return r;
 381
 382         r = sd_bus_message_append(m, "(sv)(sv)(sv)(sv)(sv)",
 383                                   "PIDs", "au", 1, machine->leader,
 384                                   "Delegate", "b", 1,
 385                                   "CollectMode", "s", "inactive-or-failed",
 386                                   "AddRef", "b", 1,
 387                                   "TasksMax", "t", UINT64_C(16384));
 388         if (r < 0)
 389                 return r;
 390
 391         if (more_properties) {
 392                 r = sd_bus_message_copy(m, more_properties, true);
 393                 if (r < 0)
 394                         return r;
 395         }
 396
 397         r = sd_bus_message_close_container(m);
 398         if (r < 0)
 399                 return r;
 400
 401         r = sd_bus_message_append(m, "a(sa(sv))", 0);
 402         if (r < 0)
 403                 return r;
 404
 405         r = sd_bus_call(NULL, m, 0, error, &reply);
 406         if (r < 0)
 407                 return r;
 408
 409         machine->unit = TAKE_PTR(unit);
 410         machine->referenced = true;
 411
 412         const char *job;
 413         r = sd_bus_message_read(reply, "o", &job);
 414         if (r < 0)
 415                 return r;
 416
 417         return free_and_strdup(&machine->scope_job, job);
 418 }
 419
 420 static int machine_ensure_scope(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
 421         int r;
 422
 423         assert(m);
 424         assert(m->class != MACHINE_HOST);
 425
 426         if (!m->unit) {
 427                 r = machine_start_scope(m, properties, error);
 428                 if (r < 0)
 429                         return log_error_errno(r, "Failed to start machine scope: %s", bus_error_message(error, r));
 430         }
 431
 432         assert(m->unit);
 433         hashmap_put(m->manager->machine_units, m->unit, m);
 434
 435         return 0;
 436 }
 437
 438 int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
 439         int r;
 440
 441         assert(m);
 442
 443         if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
 444                 return -EOPNOTSUPP;
 445
 446         if (m->started)
 447                 return 0;
 448
 449         r = hashmap_put(m->manager->machine_leaders, PID_TO_PTR(m->leader), m);
 450         if (r < 0)
 451                 return r;
 452
 453         /* Create cgroup */
 454         r = machine_ensure_scope(m, properties, error);
 455         if (r < 0)
 456                 return r;
 457
 458         log_struct(LOG_INFO,
 459                    "MESSAGE_ID=" SD_MESSAGE_MACHINE_START_STR,
 460                    "NAME=%s", m->name,
 461                    "LEADER="PID_FMT, m->leader,
 462                    LOG_MESSAGE("New machine %s.", m->name));
 463
 464         if (!dual_timestamp_is_set(&m->timestamp))
 465                 dual_timestamp_get(&m->timestamp);
 466
 467         m->started = true;
 468
 469         /* Save new machine data */
 470         machine_save(m);
 471
 472         machine_send_signal(m, true);
 473         (void) manager_enqueue_nscd_cache_flush(m->manager);
 474
 475         return 0;
 476 }
 477
 478 static int machine_stop_scope(Machine *m) {
 479         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 480         char *job = NULL;
 481         int r, q;
 482
 483         assert(m);
 484         assert(m->class != MACHINE_HOST);
 485
 486         if (!m->unit)
 487                 return 0;
 488
 489         r = manager_stop_unit(m->manager, m->unit, &error, &job);
 490         if (r < 0) {
 491                 log_error_errno(r, "Failed to stop machine scope: %s", bus_error_message(&error, r));
 492                 sd_bus_error_free(&error);
 493         } else
 494                 free_and_replace(m->scope_job, job);
 495
 496         if (m->referenced) {
 497                 q = manager_unref_unit(m->manager, m->unit, &error);
 498                 if (q < 0)
 499                         log_warning_errno(q, "Failed to drop reference to machine scope, ignoring: %s", bus_error_message(&error, r));
 500                 m->referenced = false;
 501         }
 502
 503         return r;
 504 }
 505
 506 int machine_stop(Machine *m) {
 507         int r;
 508         assert(m);
 509
 510         if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
 511                 return -EOPNOTSUPP;
 512
 513         r = machine_stop_scope(m);
 514
 515         m->stopping = true;
 516
 517         machine_save(m);
 518         (void) manager_enqueue_nscd_cache_flush(m->manager);
 519
 520         return r;
 521 }
 522
 523 int machine_finalize(Machine *m) {
 524         assert(m);
 525
 526         if (m->started) {
 527                 log_struct(LOG_INFO,
 528                            "MESSAGE_ID=" SD_MESSAGE_MACHINE_STOP_STR,
 529                            "NAME=%s", m->name,
 530                            "LEADER="PID_FMT, m->leader,
 531                            LOG_MESSAGE("Machine %s terminated.", m->name));
 532
 533                 m->stopping = true; /* The machine is supposed to be going away. Don't try to kill it. */
 534         }
 535
 536         machine_unlink(m);
 537         machine_add_to_gc_queue(m);
 538
 539         if (m->started) {
 540                 machine_send_signal(m, false);
 541                 m->started = false;
 542         }
 543
 544         return 0;
 545 }
 546
 547 bool machine_may_gc(Machine *m, bool drop_not_started) {
 548         assert(m);
 549
 550         if (m->class == MACHINE_HOST)
 551                 return false;
 552
 553         if (drop_not_started && !m->started)
 554                 return true;
 555
 556         if (m->scope_job && manager_job_is_active(m->manager, m->scope_job))
 557                 return false;
 558
 559         if (m->unit && manager_unit_is_active(m->manager, m->unit))
 560                 return false;
 561
 562         return true;
 563 }
 564
 565 void machine_add_to_gc_queue(Machine *m) {
 566         assert(m);
 567
 568         if (m->in_gc_queue)
 569                 return;
 570
 571         LIST_PREPEND(gc_queue, m->manager->machine_gc_queue, m);
 572         m->in_gc_queue = true;
 573 }
 574
 575 MachineState machine_get_state(Machine *s) {
 576         assert(s);
 577
 578         if (s->class == MACHINE_HOST)
 579                 return MACHINE_RUNNING;
 580
 581         if (s->stopping)
 582                 return MACHINE_CLOSING;
 583
 584         if (s->scope_job)
 585                 return MACHINE_OPENING;
 586
 587         return MACHINE_RUNNING;
 588 }
 589
 590 int machine_kill(Machine *m, KillWho who, int signo) {
 591         assert(m);
 592
 593         if (!IN_SET(m->class, MACHINE_VM, MACHINE_CONTAINER))
 594                 return -EOPNOTSUPP;
 595
 596         if (!m->unit)
 597                 return -ESRCH;
 598
 599         if (who == KILL_LEADER) {
 600                 /* If we shall simply kill the leader, do so directly */
 601
 602                 if (kill(m->leader, signo) < 0)
 603                         return -errno;
 604
 605                 return 0;
 606         }
 607
 608         /* Otherwise, make PID 1 do it for us, for the entire cgroup */
 609         return manager_kill_unit(m->manager, m->unit, signo, NULL);
 610 }
 611
 612 int machine_openpt(Machine *m, int flags, char **ret_slave) {
 613         assert(m);
 614
 615         switch (m->class) {
 616
 617         case MACHINE_HOST:
 618
 619                 return openpt_allocate(flags, ret_slave);
 620
 621         case MACHINE_CONTAINER:
 622                 if (m->leader <= 0)
 623                         return -EINVAL;
 624
 625                 return openpt_allocate_in_namespace(m->leader, flags, ret_slave);
 626
 627         default:
 628                 return -EOPNOTSUPP;
 629         }
 630 }
 631
 632 int machine_open_terminal(Machine *m, const char *path, int mode) {
 633         assert(m);
 634
 635         switch (m->class) {
 636
 637         case MACHINE_HOST:
 638                 return open_terminal(path, mode);
 639
 640         case MACHINE_CONTAINER:
 641                 if (m->leader <= 0)
 642                         return -EINVAL;
 643
 644                 return open_terminal_in_namespace(m->leader, path, mode);
 645
 646         default:
 647                 return -EOPNOTSUPP;
 648         }
 649 }
 650
 651 void machine_release_unit(Machine *m) {
 652         assert(m);
 653
 654         if (!m->unit)
 655                 return;
 656
 657         (void) hashmap_remove(m->manager->machine_units, m->unit);
 658         m->unit = mfree(m->unit);
 659 }
 660
 661 int machine_get_uid_shift(Machine *m, uid_t *ret) {
 662         char p[STRLEN("/proc//uid_map") + DECIMAL_STR_MAX(pid_t) + 1];
 663         uid_t uid_base, uid_shift, uid_range;
 664         gid_t gid_base, gid_shift, gid_range;
 665         _cleanup_fclose_ FILE *f = NULL;
 666         int k, r;
 667
 668         assert(m);
 669         assert(ret);
 670
 671         /* Return the base UID/GID of the specified machine. Note that this only works for containers with simple
 672          * mappings. In most cases setups should be simple like this, and administrators should only care about the
 673          * basic offset a container has relative to the host. This is what this function exposes.
 674          *
 675          * If we encounter any more complex mappings we politely refuse this with ENXIO. */
 676
 677         if (m->class == MACHINE_HOST) {
 678                 *ret = 0;
 679                 return 0;
 680         }
 681
 682         if (m->class != MACHINE_CONTAINER)
 683                 return -EOPNOTSUPP;
 684
 685         xsprintf(p, "/proc/" PID_FMT "/uid_map", m->leader);
 686         f = fopen(p, "re");
 687         if (!f) {
 688                 if (errno == ENOENT) {
 689                         /* If the file doesn't exist, user namespacing is off in the kernel, return a zero mapping hence. */
 690                         *ret = 0;
 691                         return 0;
 692                 }
 693
 694                 return -errno;
 695         }
 696
 697         /* Read the first line. There's at least one. */
 698         errno = 0;
 699         k = fscanf(f, UID_FMT " " UID_FMT " " UID_FMT "\n", &uid_base, &uid_shift, &uid_range);
 700         if (k != 3) {
 701                 if (ferror(f))
 702                         return errno_or_else(EIO);
 703
 704                 return -EBADMSG;
 705         }
 706
 707         /* Not a mapping starting at 0? Then it's a complex mapping we can't expose here. */
 708         if (uid_base != 0)
 709                 return -ENXIO;
 710         /* Insist that at least the nobody user is mapped, everything else is weird, and hence complex, and we don't support it */
 711         if (uid_range < UID_NOBODY)
 712                 return -ENXIO;
 713
 714         /* If there's more than one line, then we don't support this mapping. */
 715         r = safe_fgetc(f, NULL);
 716         if (r < 0)
 717                 return r;
 718         if (r != 0) /* Insist on EOF */
 719                 return -ENXIO;
 720
 721         fclose(f);
 722
 723         xsprintf(p, "/proc/" PID_FMT "/gid_map", m->leader);
 724         f = fopen(p, "re");
 725         if (!f)
 726                 return -errno;
 727
 728         /* Read the first line. There's at least one. */
 729         errno = 0;
 730         k = fscanf(f, GID_FMT " " GID_FMT " " GID_FMT "\n", &gid_base, &gid_shift, &gid_range);
 731         if (k != 3) {
 732                 if (ferror(f))
 733                         return errno_or_else(EIO);
 734
 735                 return -EBADMSG;
 736         }
 737
 738         /* If there's more than one line, then we don't support this file. */
 739         r = safe_fgetc(f, NULL);
 740         if (r < 0)
 741                 return r;
 742         if (r != 0) /* Insist on EOF */
 743                 return -ENXIO;
 744
 745         /* If the UID and GID mapping doesn't match, we don't support this mapping. */
 746         if (uid_base != (uid_t) gid_base)
 747                 return -ENXIO;
 748         if (uid_shift != (uid_t) gid_shift)
 749                 return -ENXIO;
 750         if (uid_range != (uid_t) gid_range)
 751                 return -ENXIO;
 752
 753         *ret = uid_shift;
 754         return 0;
 755 }
 756
 757 static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
 758         [MACHINE_CONTAINER] = "container",
 759         [MACHINE_VM] = "vm",
 760         [MACHINE_HOST] = "host",
 761 };
 762
 763 DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass);
 764
 765 static const char* const machine_state_table[_MACHINE_STATE_MAX] = {
 766         [MACHINE_OPENING] = "opening",
 767         [MACHINE_RUNNING] = "running",
 768         [MACHINE_CLOSING] = "closing"
 769 };
 770
 771 DEFINE_STRING_TABLE_LOOKUP(machine_state, MachineState);
 772
 773 static const char* const kill_who_table[_KILL_WHO_MAX] = {
 774         [KILL_LEADER] = "leader",
 775         [KILL_ALL] = "all"
 776 };
 777
 778 DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);