src/core/swap.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <limits.h>
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <sys/epoll.h>
  27 #include <sys/stat.h>
  28 #include <sys/swap.h>
  29 #include <libudev.h>
  30
  31 #include "unit.h"
  32 #include "swap.h"
  33 #include "load-fragment.h"
  34 #include "load-dropin.h"
  35 #include "unit-name.h"
  36 #include "dbus-swap.h"
  37 #include "special.h"
  38 #include "bus-common-errors.h"
  39 #include "exit-status.h"
  40 #include "def.h"
  41 #include "path-util.h"
  42 #include "virt.h"
  43 #include "udev-util.h"
  44
  45 static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
  46         [SWAP_DEAD] = UNIT_INACTIVE,
  47         [SWAP_ACTIVATING] = UNIT_ACTIVATING,
  48         [SWAP_ACTIVATING_DONE] = UNIT_ACTIVE,
  49         [SWAP_ACTIVE] = UNIT_ACTIVE,
  50         [SWAP_DEACTIVATING] = UNIT_DEACTIVATING,
  51         [SWAP_ACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
  52         [SWAP_ACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
  53         [SWAP_DEACTIVATING_SIGTERM] = UNIT_DEACTIVATING,
  54         [SWAP_DEACTIVATING_SIGKILL] = UNIT_DEACTIVATING,
  55         [SWAP_FAILED] = UNIT_FAILED
  56 };
  57
  58 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
  59 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
  60
  61 static void swap_unset_proc_swaps(Swap *s) {
  62         assert(s);
  63
  64         if (!s->from_proc_swaps)
  65                 return;
  66
  67         free(s->parameters_proc_swaps.what);
  68         s->parameters_proc_swaps.what = NULL;
  69
  70         s->from_proc_swaps = false;
  71 }
  72
  73 static int swap_set_devnode(Swap *s, const char *devnode) {
  74         Hashmap *swaps;
  75         Swap *first;
  76         int r;
  77
  78         assert(s);
  79
  80         r = hashmap_ensure_allocated(&UNIT(s)->manager->swaps_by_devnode, &string_hash_ops);
  81         if (r < 0)
  82                 return r;
  83
  84         swaps = UNIT(s)->manager->swaps_by_devnode;
  85
  86         if (s->devnode) {
  87                 first = hashmap_get(swaps, s->devnode);
  88
  89                 LIST_REMOVE(same_devnode, first, s);
  90                 if (first)
  91                         hashmap_replace(swaps, first->devnode, first);
  92                 else
  93                         hashmap_remove(swaps, s->devnode);
  94
  95                 free(s->devnode);
  96                 s->devnode = NULL;
  97         }
  98
  99         if (devnode) {
 100                 s->devnode = strdup(devnode);
 101                 if (!s->devnode)
 102                         return -ENOMEM;
 103
 104                 first = hashmap_get(swaps, s->devnode);
 105                 LIST_PREPEND(same_devnode, first, s);
 106
 107                 return hashmap_replace(swaps, first->devnode, first);
 108         }
 109
 110         return 0;
 111 }
 112
 113 static void swap_init(Unit *u) {
 114         Swap *s = SWAP(u);
 115
 116         assert(s);
 117         assert(UNIT(s)->load_state == UNIT_STUB);
 118
 119         s->timeout_usec = u->manager->default_timeout_start_usec;
 120
 121         s->exec_context.std_output = u->manager->default_std_output;
 122         s->exec_context.std_error = u->manager->default_std_error;
 123
 124         s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
 125
 126         s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
 127
 128         u->ignore_on_isolate = true;
 129 }
 130
 131 static void swap_unwatch_control_pid(Swap *s) {
 132         assert(s);
 133
 134         if (s->control_pid <= 0)
 135                 return;
 136
 137         unit_unwatch_pid(UNIT(s), s->control_pid);
 138         s->control_pid = 0;
 139 }
 140
 141 static void swap_done(Unit *u) {
 142         Swap *s = SWAP(u);
 143
 144         assert(s);
 145
 146         swap_unset_proc_swaps(s);
 147         swap_set_devnode(s, NULL);
 148
 149         free(s->what);
 150         s->what = NULL;
 151
 152         free(s->parameters_fragment.what);
 153         s->parameters_fragment.what = NULL;
 154
 155         free(s->parameters_fragment.options);
 156         s->parameters_fragment.options = NULL;
 157
 158         s->exec_runtime = exec_runtime_unref(s->exec_runtime);
 159         exec_command_done_array(s->exec_command, _SWAP_EXEC_COMMAND_MAX);
 160         s->control_command = NULL;
 161
 162         swap_unwatch_control_pid(s);
 163
 164         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
 165 }
 166
 167 static int swap_arm_timer(Swap *s) {
 168         int r;
 169
 170         assert(s);
 171
 172         if (s->timeout_usec <= 0) {
 173                 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
 174                 return 0;
 175         }
 176
 177         if (s->timer_event_source) {
 178                 r = sd_event_source_set_time(s->timer_event_source, now(CLOCK_MONOTONIC) + s->timeout_usec);
 179                 if (r < 0)
 180                         return r;
 181
 182                 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
 183         }
 184
 185         return sd_event_add_time(
 186                         UNIT(s)->manager->event,
 187                         &s->timer_event_source,
 188                         CLOCK_MONOTONIC,
 189                         now(CLOCK_MONOTONIC) + s->timeout_usec, 0,
 190                         swap_dispatch_timer, s);
 191 }
 192
 193 static int swap_add_device_links(Swap *s) {
 194         assert(s);
 195
 196         if (!s->what)
 197                 return 0;
 198
 199         if (!s->from_fragment)
 200                 return 0;
 201
 202         if (is_device_path(s->what))
 203                 return unit_add_node_link(UNIT(s), s->what, UNIT(s)->manager->running_as == SYSTEMD_SYSTEM);
 204         else
 205                 /* File based swap devices need to be ordered after
 206                  * systemd-remount-fs.service, since they might need a
 207                  * writable file system. */
 208                 return unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_REMOUNT_FS_SERVICE, NULL, true);
 209 }
 210
 211 static int swap_add_default_dependencies(Swap *s) {
 212         assert(s);
 213
 214         if (UNIT(s)->manager->running_as != SYSTEMD_SYSTEM)
 215                 return 0;
 216
 217         if (detect_container(NULL) > 0)
 218                 return 0;
 219
 220         return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
 221 }
 222
 223 static int swap_verify(Swap *s) {
 224         bool b;
 225         _cleanup_free_ char *e = NULL;
 226
 227         if (UNIT(s)->load_state != UNIT_LOADED)
 228                 return 0;
 229
 230         e = unit_name_from_path(s->what, ".swap");
 231         if (!e)
 232                 return log_oom();
 233
 234         b = unit_has_name(UNIT(s), e);
 235         if (!b) {
 236                 log_unit_error(UNIT(s)->id, "%s: Value of \"What\" and unit name do not match, not loading.", UNIT(s)->id);
 237                 return -EINVAL;
 238         }
 239
 240         if (s->exec_context.pam_name && s->kill_context.kill_mode != KILL_CONTROL_GROUP) {
 241                 log_unit_error(UNIT(s)->id, "%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing to load.", UNIT(s)->id);
 242                 return -EINVAL;
 243         }
 244
 245         return 0;
 246 }
 247
 248 static int swap_load_devnode(Swap *s) {
 249         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 250         struct stat st;
 251         const char *p;
 252
 253         assert(s);
 254
 255         if (stat(s->what, &st) < 0 || !S_ISBLK(st.st_mode))
 256                 return 0;
 257
 258         d = udev_device_new_from_devnum(UNIT(s)->manager->udev, 'b', st.st_rdev);
 259         if (!d)
 260                 return 0;
 261
 262         p = udev_device_get_devnode(d);
 263         if (!p)
 264                 return 0;
 265
 266         return swap_set_devnode(s, p);
 267 }
 268
 269 static int swap_load(Unit *u) {
 270         int r;
 271         Swap *s = SWAP(u);
 272
 273         assert(s);
 274         assert(u->load_state == UNIT_STUB);
 275
 276         /* Load a .swap file */
 277         r = unit_load_fragment_and_dropin_optional(u);
 278         if (r < 0)
 279                 return r;
 280
 281         if (u->load_state == UNIT_LOADED) {
 282
 283                 if (UNIT(s)->fragment_path)
 284                         s->from_fragment = true;
 285
 286                 if (!s->what) {
 287                         if (s->parameters_fragment.what)
 288                                 s->what = strdup(s->parameters_fragment.what);
 289                         else if (s->parameters_proc_swaps.what)
 290                                 s->what = strdup(s->parameters_proc_swaps.what);
 291                         else
 292                                 s->what = unit_name_to_path(u->id);
 293
 294                         if (!s->what)
 295                                 return -ENOMEM;
 296                 }
 297
 298                 path_kill_slashes(s->what);
 299
 300                 if (!UNIT(s)->description) {
 301                         r = unit_set_description(u, s->what);
 302                         if (r < 0)
 303                                 return r;
 304                 }
 305
 306                 r = unit_require_mounts_for(UNIT(s), s->what);
 307                 if (r < 0)
 308                         return r;
 309
 310                 r = swap_add_device_links(s);
 311                 if (r < 0)
 312                         return r;
 313
 314                 r = swap_load_devnode(s);
 315                 if (r < 0)
 316                         return r;
 317
 318                 r = unit_patch_contexts(u);
 319                 if (r < 0)
 320                         return r;
 321
 322                 r = unit_add_exec_dependencies(u, &s->exec_context);
 323                 if (r < 0)
 324                         return r;
 325
 326                 r = unit_add_default_slice(u, &s->cgroup_context);
 327                 if (r < 0)
 328                         return r;
 329
 330                 if (UNIT(s)->default_dependencies) {
 331                         r = swap_add_default_dependencies(s);
 332                         if (r < 0)
 333                                 return r;
 334                 }
 335         }
 336
 337         return swap_verify(s);
 338 }
 339
 340 static int swap_add_one(
 341                 Manager *m,
 342                 const char *what,
 343                 const char *what_proc_swaps,
 344                 int priority,
 345                 bool set_flags) {
 346
 347         _cleanup_free_ char *e = NULL;
 348         bool delete = false;
 349         Unit *u = NULL;
 350         int r;
 351         SwapParameters *p;
 352
 353         assert(m);
 354         assert(what);
 355         assert(what_proc_swaps);
 356
 357         e = unit_name_from_path(what, ".swap");
 358         if (!e)
 359                 return log_oom();
 360
 361         u = manager_get_unit(m, e);
 362
 363         if (u &&
 364             SWAP(u)->from_proc_swaps &&
 365             !path_equal(SWAP(u)->parameters_proc_swaps.what, what_proc_swaps))
 366                 return -EEXIST;
 367
 368         if (!u) {
 369                 delete = true;
 370
 371                 u = unit_new(m, sizeof(Swap));
 372                 if (!u)
 373                         return log_oom();
 374
 375                 r = unit_add_name(u, e);
 376                 if (r < 0)
 377                         goto fail;
 378
 379                 SWAP(u)->what = strdup(what);
 380                 if (!SWAP(u)->what) {
 381                         r = log_oom();
 382                         goto fail;
 383                 }
 384
 385                 unit_add_to_load_queue(u);
 386         } else
 387                 delete = false;
 388
 389         p = &SWAP(u)->parameters_proc_swaps;
 390
 391         if (!p->what) {
 392                 p->what = strdup(what_proc_swaps);
 393                 if (!p->what) {
 394                         r = -ENOMEM;
 395                         goto fail;
 396                 }
 397         }
 398
 399         if (set_flags) {
 400                 SWAP(u)->is_active = true;
 401                 SWAP(u)->just_activated = !SWAP(u)->from_proc_swaps;
 402         }
 403
 404         SWAP(u)->from_proc_swaps = true;
 405
 406         p->priority = priority;
 407
 408         unit_add_to_dbus_queue(u);
 409
 410         return 0;
 411
 412 fail:
 413         log_unit_warning_errno(e, r, "Failed to load swap unit: %m");
 414
 415         if (delete && u)
 416                 unit_free(u);
 417
 418         return r;
 419 }
 420
 421 static int swap_process_new_swap(Manager *m, const char *device, int prio, bool set_flags) {
 422         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 423         struct udev_list_entry *item = NULL, *first = NULL;
 424         const char *dn;
 425         struct stat st;
 426         int r;
 427
 428         assert(m);
 429
 430         r = swap_add_one(m, device, device, prio, set_flags);
 431         if (r < 0)
 432                 return r;
 433
 434         /* If this is a block device, then let's add duplicates for
 435          * all other names of this block device */
 436         if (stat(device, &st) < 0 || !S_ISBLK(st.st_mode))
 437                 return 0;
 438
 439         d = udev_device_new_from_devnum(m->udev, 'b', st.st_rdev);
 440         if (!d)
 441                 return 0;
 442
 443         /* Add the main device node */
 444         dn = udev_device_get_devnode(d);
 445         if (dn && !streq(dn, device))
 446                 swap_add_one(m, dn, device, prio, set_flags);
 447
 448         /* Add additional units for all symlinks */
 449         first = udev_device_get_devlinks_list_entry(d);
 450         udev_list_entry_foreach(item, first) {
 451                 const char *p;
 452
 453                 /* Don't bother with the /dev/block links */
 454                 p = udev_list_entry_get_name(item);
 455
 456                 if (streq(p, device))
 457                         continue;
 458
 459                 if (path_startswith(p, "/dev/block/"))
 460                         continue;
 461
 462                 if (stat(p, &st) >= 0)
 463                         if (!S_ISBLK(st.st_mode) ||
 464                             st.st_rdev != udev_device_get_devnum(d))
 465                                 continue;
 466
 467                 swap_add_one(m, p, device, prio, set_flags);
 468         }
 469
 470         return r;
 471 }
 472
 473 static void swap_set_state(Swap *s, SwapState state) {
 474         SwapState old_state;
 475
 476         assert(s);
 477
 478         old_state = s->state;
 479         s->state = state;
 480
 481         if (state != SWAP_ACTIVATING &&
 482             state != SWAP_ACTIVATING_SIGTERM &&
 483             state != SWAP_ACTIVATING_SIGKILL &&
 484             state != SWAP_ACTIVATING_DONE &&
 485             state != SWAP_DEACTIVATING &&
 486             state != SWAP_DEACTIVATING_SIGTERM &&
 487             state != SWAP_DEACTIVATING_SIGKILL) {
 488                 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
 489                 swap_unwatch_control_pid(s);
 490                 s->control_command = NULL;
 491                 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
 492         }
 493
 494         if (state != old_state)
 495                 log_unit_debug(UNIT(s)->id,
 496                                "%s changed %s -> %s",
 497                                UNIT(s)->id,
 498                                swap_state_to_string(old_state),
 499                                swap_state_to_string(state));
 500
 501         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true);
 502 }
 503
 504 static int swap_coldplug(Unit *u) {
 505         Swap *s = SWAP(u);
 506         SwapState new_state = SWAP_DEAD;
 507         int r;
 508
 509         assert(s);
 510         assert(s->state == SWAP_DEAD);
 511
 512         if (s->deserialized_state != s->state)
 513                 new_state = s->deserialized_state;
 514         else if (s->from_proc_swaps)
 515                 new_state = SWAP_ACTIVE;
 516
 517         if (new_state == s->state)
 518                 return 0;
 519
 520         if (new_state == SWAP_ACTIVATING ||
 521             new_state == SWAP_ACTIVATING_SIGTERM ||
 522             new_state == SWAP_ACTIVATING_SIGKILL ||
 523             new_state == SWAP_ACTIVATING_DONE ||
 524             new_state == SWAP_DEACTIVATING ||
 525             new_state == SWAP_DEACTIVATING_SIGTERM ||
 526             new_state == SWAP_DEACTIVATING_SIGKILL) {
 527
 528                 if (s->control_pid <= 0)
 529                         return -EBADMSG;
 530
 531                 r = unit_watch_pid(UNIT(s), s->control_pid);
 532                 if (r < 0)
 533                         return r;
 534
 535                 r = swap_arm_timer(s);
 536                 if (r < 0)
 537                         return r;
 538         }
 539
 540         swap_set_state(s, new_state);
 541         return 0;
 542 }
 543
 544 static void swap_dump(Unit *u, FILE *f, const char *prefix) {
 545         Swap *s = SWAP(u);
 546         SwapParameters *p;
 547
 548         assert(s);
 549         assert(f);
 550
 551         if (s->from_proc_swaps)
 552                 p = &s->parameters_proc_swaps;
 553         else if (s->from_fragment)
 554                 p = &s->parameters_fragment;
 555         else
 556                 p = NULL;
 557
 558         fprintf(f,
 559                 "%sSwap State: %s\n"
 560                 "%sResult: %s\n"
 561                 "%sWhat: %s\n"
 562                 "%sFrom /proc/swaps: %s\n"
 563                 "%sFrom fragment: %s\n",
 564                 prefix, swap_state_to_string(s->state),
 565                 prefix, swap_result_to_string(s->result),
 566                 prefix, s->what,
 567                 prefix, yes_no(s->from_proc_swaps),
 568                 prefix, yes_no(s->from_fragment));
 569
 570         if (s->devnode)
 571                 fprintf(f, "%sDevice Node: %s\n", prefix, s->devnode);
 572
 573         if (p)
 574                 fprintf(f,
 575                         "%sPriority: %i\n"
 576                         "%sOptions: %s\n",
 577                         prefix, p->priority,
 578                         prefix, strempty(p->options));
 579
 580         if (s->control_pid > 0)
 581                 fprintf(f,
 582                         "%sControl PID: "PID_FMT"\n",
 583                         prefix, s->control_pid);
 584
 585         exec_context_dump(&s->exec_context, f, prefix);
 586         kill_context_dump(&s->kill_context, f, prefix);
 587 }
 588
 589 static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
 590         pid_t pid;
 591         int r;
 592         ExecParameters exec_params = {
 593                 .apply_permissions = true,
 594                 .apply_chroot      = true,
 595                 .apply_tty_stdin   = true,
 596         };
 597
 598         assert(s);
 599         assert(c);
 600         assert(_pid);
 601
 602         unit_realize_cgroup(UNIT(s));
 603
 604         r = unit_setup_exec_runtime(UNIT(s));
 605         if (r < 0)
 606                 goto fail;
 607
 608         r = swap_arm_timer(s);
 609         if (r < 0)
 610                 goto fail;
 611
 612         exec_params.environment = UNIT(s)->manager->environment;
 613         exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
 614         exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
 615         exec_params.cgroup_path = UNIT(s)->cgroup_path;
 616         exec_params.cgroup_delegate = s->cgroup_context.delegate;
 617         exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
 618         exec_params.unit_id = UNIT(s)->id;
 619
 620         r = exec_spawn(c,
 621                        &s->exec_context,
 622                        &exec_params,
 623                        s->exec_runtime,
 624                        &pid);
 625         if (r < 0)
 626                 goto fail;
 627
 628         r = unit_watch_pid(UNIT(s), pid);
 629         if (r < 0)
 630                 /* FIXME: we need to do something here */
 631                 goto fail;
 632
 633         *_pid = pid;
 634
 635         return 0;
 636
 637 fail:
 638         s->timer_event_source = sd_event_source_unref(s->timer_event_source);
 639
 640         return r;
 641 }
 642
 643 static void swap_enter_dead(Swap *s, SwapResult f) {
 644         assert(s);
 645
 646         if (f != SWAP_SUCCESS)
 647                 s->result = f;
 648
 649         exec_runtime_destroy(s->exec_runtime);
 650         s->exec_runtime = exec_runtime_unref(s->exec_runtime);
 651
 652         exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
 653
 654         swap_set_state(s, s->result != SWAP_SUCCESS ? SWAP_FAILED : SWAP_DEAD);
 655 }
 656
 657 static void swap_enter_active(Swap *s, SwapResult f) {
 658         assert(s);
 659
 660         if (f != SWAP_SUCCESS)
 661                 s->result = f;
 662
 663         swap_set_state(s, SWAP_ACTIVE);
 664 }
 665
 666 static void swap_enter_signal(Swap *s, SwapState state, SwapResult f) {
 667         int r;
 668
 669         assert(s);
 670
 671         if (f != SWAP_SUCCESS)
 672                 s->result = f;
 673
 674         r = unit_kill_context(
 675                         UNIT(s),
 676                         &s->kill_context,
 677                         (state != SWAP_ACTIVATING_SIGTERM && state != SWAP_DEACTIVATING_SIGTERM) ?
 678                         KILL_KILL : KILL_TERMINATE,
 679                         -1,
 680                         s->control_pid,
 681                         false);
 682         if (r < 0)
 683                 goto fail;
 684
 685         if (r > 0) {
 686                 r = swap_arm_timer(s);
 687                 if (r < 0)
 688                         goto fail;
 689
 690                 swap_set_state(s, state);
 691         } else if (state == SWAP_ACTIVATING_SIGTERM)
 692                 swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_SUCCESS);
 693         else if (state == SWAP_DEACTIVATING_SIGTERM)
 694                 swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_SUCCESS);
 695         else
 696                 swap_enter_dead(s, SWAP_SUCCESS);
 697
 698         return;
 699
 700 fail:
 701         log_unit_warning(UNIT(s)->id,
 702                          "%s failed to kill processes: %s", UNIT(s)->id, strerror(-r));
 703
 704         swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
 705 }
 706
 707 static int mount_find_pri(const char *options, int *ret) {
 708         const char *opt;
 709         char *end;
 710         unsigned long r;
 711
 712         assert(ret);
 713
 714         if (!options)
 715                 return 0;
 716
 717         opt = mount_test_option(options, "pri");
 718         if (!opt)
 719                 return 0;
 720
 721         opt += strlen("pri");
 722         if (*opt != '=')
 723                 return -EINVAL;
 724
 725         errno = 0;
 726         r = strtoul(opt + 1, &end, 10);
 727         if (errno > 0)
 728                 return -errno;
 729
 730         if (end == opt + 1 || (*end != ',' && *end != 0))
 731                 return -EINVAL;
 732
 733         *ret = (int) r;
 734         return 1;
 735 }
 736
 737 static int mount_find_discard(const char *options, char **ret) {
 738         const char *opt;
 739         char *ans;
 740         size_t len;
 741
 742         assert(ret);
 743
 744         if (!options)
 745                 return 0;
 746
 747         opt = mount_test_option(options, "discard");
 748         if (!opt)
 749                 return 0;
 750
 751         opt += strlen("discard");
 752         if (*opt == ',' || *opt == '\0')
 753                 ans = strdup("all");
 754         else {
 755                 if (*opt != '=')
 756                         return -EINVAL;
 757
 758                 len = strcspn(opt + 1, ",");
 759                 if (len == 0)
 760                         return -EINVAL;
 761
 762                 ans = strndup(opt + 1, len);
 763         }
 764
 765         if (!ans)
 766                 return -ENOMEM;
 767
 768         *ret = ans;
 769         return 1;
 770 }
 771
 772 static void swap_enter_activating(Swap *s) {
 773         _cleanup_free_ char *discard = NULL;
 774         int r, priority = -1;
 775
 776         assert(s);
 777
 778         s->control_command_id = SWAP_EXEC_ACTIVATE;
 779         s->control_command = s->exec_command + SWAP_EXEC_ACTIVATE;
 780
 781         if (s->from_fragment) {
 782                 mount_find_discard(s->parameters_fragment.options, &discard);
 783
 784                 priority = s->parameters_fragment.priority;
 785                 if (priority < 0)
 786                         mount_find_pri(s->parameters_fragment.options, &priority);
 787         }
 788
 789         r = exec_command_set(s->control_command, "/sbin/swapon", NULL);
 790         if (r < 0)
 791                 goto fail;
 792
 793         if (priority >= 0) {
 794                 char p[DECIMAL_STR_MAX(int)];
 795
 796                 sprintf(p, "%i", priority);
 797                 r = exec_command_append(s->control_command, "-p", p, NULL);
 798                 if (r < 0)
 799                         goto fail;
 800         }
 801
 802         if (discard && !streq(discard, "none")) {
 803                 const char *discard_arg;
 804
 805                 if (streq(discard, "all"))
 806                         discard_arg = "--discard";
 807                 else
 808                         discard_arg = strappenda("--discard=", discard);
 809
 810                 r = exec_command_append(s->control_command, discard_arg, NULL);
 811                 if (r < 0)
 812                         goto fail;
 813         }
 814
 815         r = exec_command_append(s->control_command, s->what, NULL);
 816         if (r < 0)
 817                 goto fail;
 818
 819         swap_unwatch_control_pid(s);
 820
 821         r = swap_spawn(s, s->control_command, &s->control_pid);
 822         if (r < 0)
 823                 goto fail;
 824
 825         swap_set_state(s, SWAP_ACTIVATING);
 826
 827         return;
 828
 829 fail:
 830         log_unit_warning(UNIT(s)->id,
 831                          "%s failed to run 'swapon' task: %s",
 832                          UNIT(s)->id, strerror(-r));
 833         swap_enter_dead(s, SWAP_FAILURE_RESOURCES);
 834 }
 835
 836 static void swap_enter_deactivating(Swap *s) {
 837         int r;
 838
 839         assert(s);
 840
 841         s->control_command_id = SWAP_EXEC_DEACTIVATE;
 842         s->control_command = s->exec_command + SWAP_EXEC_DEACTIVATE;
 843
 844         r = exec_command_set(s->control_command,
 845                              "/sbin/swapoff",
 846                              s->what,
 847                              NULL);
 848         if (r < 0)
 849                 goto fail;
 850
 851         swap_unwatch_control_pid(s);
 852
 853         r = swap_spawn(s, s->control_command, &s->control_pid);
 854         if (r < 0)
 855                 goto fail;
 856
 857         swap_set_state(s, SWAP_DEACTIVATING);
 858
 859         return;
 860
 861 fail:
 862         log_unit_warning(UNIT(s)->id,
 863                          "%s failed to run 'swapoff' task: %s",
 864                          UNIT(s)->id, strerror(-r));
 865         swap_enter_active(s, SWAP_FAILURE_RESOURCES);
 866 }
 867
 868 static int swap_start(Unit *u) {
 869         Swap *s = SWAP(u);
 870
 871         assert(s);
 872
 873         /* We cannot fulfill this request right now, try again later
 874          * please! */
 875
 876         if (s->state == SWAP_DEACTIVATING ||
 877             s->state == SWAP_DEACTIVATING_SIGTERM ||
 878             s->state == SWAP_DEACTIVATING_SIGKILL ||
 879             s->state == SWAP_ACTIVATING_SIGTERM ||
 880             s->state == SWAP_ACTIVATING_SIGKILL)
 881                 return -EAGAIN;
 882
 883         if (s->state == SWAP_ACTIVATING)
 884                 return 0;
 885
 886         assert(s->state == SWAP_DEAD || s->state == SWAP_FAILED);
 887
 888         if (detect_container(NULL) > 0)
 889                 return -EPERM;
 890
 891         s->result = SWAP_SUCCESS;
 892         swap_enter_activating(s);
 893         return 0;
 894 }
 895
 896 static int swap_stop(Unit *u) {
 897         Swap *s = SWAP(u);
 898
 899         assert(s);
 900
 901         if (s->state == SWAP_DEACTIVATING ||
 902             s->state == SWAP_DEACTIVATING_SIGTERM ||
 903             s->state == SWAP_DEACTIVATING_SIGKILL ||
 904             s->state == SWAP_ACTIVATING_SIGTERM ||
 905             s->state == SWAP_ACTIVATING_SIGKILL)
 906                 return 0;
 907
 908         assert(s->state == SWAP_ACTIVATING ||
 909                s->state == SWAP_ACTIVATING_DONE ||
 910                s->state == SWAP_ACTIVE);
 911
 912         if (detect_container(NULL) > 0)
 913                 return -EPERM;
 914
 915         swap_enter_deactivating(s);
 916         return 0;
 917 }
 918
 919 static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
 920         Swap *s = SWAP(u);
 921
 922         assert(s);
 923         assert(f);
 924         assert(fds);
 925
 926         unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
 927         unit_serialize_item(u, f, "result", swap_result_to_string(s->result));
 928
 929         if (s->control_pid > 0)
 930                 unit_serialize_item_format(u, f, "control-pid", PID_FMT, s->control_pid);
 931
 932         if (s->control_command_id >= 0)
 933                 unit_serialize_item(u, f, "control-command", swap_exec_command_to_string(s->control_command_id));
 934
 935         return 0;
 936 }
 937
 938 static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 939         Swap *s = SWAP(u);
 940
 941         assert(s);
 942         assert(fds);
 943
 944         if (streq(key, "state")) {
 945                 SwapState state;
 946
 947                 state = swap_state_from_string(value);
 948                 if (state < 0)
 949                         log_unit_debug(u->id, "Failed to parse state value %s", value);
 950                 else
 951                         s->deserialized_state = state;
 952         } else if (streq(key, "result")) {
 953                 SwapResult f;
 954
 955                 f = swap_result_from_string(value);
 956                 if (f < 0)
 957                         log_unit_debug(u->id, "Failed to parse result value %s", value);
 958                 else if (f != SWAP_SUCCESS)
 959                         s->result = f;
 960         } else if (streq(key, "control-pid")) {
 961                 pid_t pid;
 962
 963                 if (parse_pid(value, &pid) < 0)
 964                         log_unit_debug(u->id, "Failed to parse control-pid value %s", value);
 965                 else
 966                         s->control_pid = pid;
 967
 968         } else if (streq(key, "control-command")) {
 969                 SwapExecCommand id;
 970
 971                 id = swap_exec_command_from_string(value);
 972                 if (id < 0)
 973                         log_unit_debug(u->id, "Failed to parse exec-command value %s", value);
 974                 else {
 975                         s->control_command_id = id;
 976                         s->control_command = s->exec_command + id;
 977                 }
 978         } else
 979                 log_unit_debug(u->id, "Unknown serialization key '%s'", key);
 980
 981         return 0;
 982 }
 983
 984 _pure_ static UnitActiveState swap_active_state(Unit *u) {
 985         assert(u);
 986
 987         return state_translation_table[SWAP(u)->state];
 988 }
 989
 990 _pure_ static const char *swap_sub_state_to_string(Unit *u) {
 991         assert(u);
 992
 993         return swap_state_to_string(SWAP(u)->state);
 994 }
 995
 996 _pure_ static bool swap_check_gc(Unit *u) {
 997         Swap *s = SWAP(u);
 998
 999         assert(s);
1000
1001         return s->from_proc_swaps;
1002 }
1003
1004 static void swap_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1005         Swap *s = SWAP(u);
1006         SwapResult f;
1007
1008         assert(s);
1009         assert(pid >= 0);
1010
1011         if (pid != s->control_pid)
1012                 return;
1013
1014         s->control_pid = 0;
1015
1016         if (is_clean_exit(code, status, NULL))
1017                 f = SWAP_SUCCESS;
1018         else if (code == CLD_EXITED)
1019                 f = SWAP_FAILURE_EXIT_CODE;
1020         else if (code == CLD_KILLED)
1021                 f = SWAP_FAILURE_SIGNAL;
1022         else if (code == CLD_DUMPED)
1023                 f = SWAP_FAILURE_CORE_DUMP;
1024         else
1025                 assert_not_reached("Unknown code");
1026
1027         if (f != SWAP_SUCCESS)
1028                 s->result = f;
1029
1030         if (s->control_command) {
1031                 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
1032
1033                 s->control_command = NULL;
1034                 s->control_command_id = _SWAP_EXEC_COMMAND_INVALID;
1035         }
1036
1037         log_unit_full(u->id,
1038                       f == SWAP_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1039                       "%s swap process exited, code=%s status=%i",
1040                       u->id, sigchld_code_to_string(code), status);
1041
1042         switch (s->state) {
1043
1044         case SWAP_ACTIVATING:
1045         case SWAP_ACTIVATING_DONE:
1046         case SWAP_ACTIVATING_SIGTERM:
1047         case SWAP_ACTIVATING_SIGKILL:
1048
1049                 if (f == SWAP_SUCCESS)
1050                         swap_enter_active(s, f);
1051                 else
1052                         swap_enter_dead(s, f);
1053                 break;
1054
1055         case SWAP_DEACTIVATING:
1056         case SWAP_DEACTIVATING_SIGKILL:
1057         case SWAP_DEACTIVATING_SIGTERM:
1058
1059                 swap_enter_dead(s, f);
1060                 break;
1061
1062         default:
1063                 assert_not_reached("Uh, control process died at wrong time.");
1064         }
1065
1066         /* Notify clients about changed exit status */
1067         unit_add_to_dbus_queue(u);
1068 }
1069
1070 static int swap_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1071         Swap *s = SWAP(userdata);
1072
1073         assert(s);
1074         assert(s->timer_event_source == source);
1075
1076         switch (s->state) {
1077
1078         case SWAP_ACTIVATING:
1079         case SWAP_ACTIVATING_DONE:
1080                 log_unit_warning(UNIT(s)->id, "%s activation timed out. Stopping.", UNIT(s)->id);
1081                 swap_enter_signal(s, SWAP_ACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1082                 break;
1083
1084         case SWAP_DEACTIVATING:
1085                 log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Stopping.", UNIT(s)->id);
1086                 swap_enter_signal(s, SWAP_DEACTIVATING_SIGTERM, SWAP_FAILURE_TIMEOUT);
1087                 break;
1088
1089         case SWAP_ACTIVATING_SIGTERM:
1090                 if (s->kill_context.send_sigkill) {
1091                         log_unit_warning(UNIT(s)->id, "%s activation timed out. Killing.", UNIT(s)->id);
1092                         swap_enter_signal(s, SWAP_ACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1093                 } else {
1094                         log_unit_warning(UNIT(s)->id, "%s activation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1095                         swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1096                 }
1097                 break;
1098
1099         case SWAP_DEACTIVATING_SIGTERM:
1100                 if (s->kill_context.send_sigkill) {
1101                         log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Killing.", UNIT(s)->id);
1102                         swap_enter_signal(s, SWAP_DEACTIVATING_SIGKILL, SWAP_FAILURE_TIMEOUT);
1103                 } else {
1104                         log_unit_warning(UNIT(s)->id, "%s deactivation timed out. Skipping SIGKILL. Ignoring.", UNIT(s)->id);
1105                         swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1106                 }
1107                 break;
1108
1109         case SWAP_ACTIVATING_SIGKILL:
1110         case SWAP_DEACTIVATING_SIGKILL:
1111                 log_unit_warning(UNIT(s)->id, "%s swap process still around after SIGKILL. Ignoring.", UNIT(s)->id);
1112                 swap_enter_dead(s, SWAP_FAILURE_TIMEOUT);
1113                 break;
1114
1115         default:
1116                 assert_not_reached("Timeout at wrong time.");
1117         }
1118
1119         return 0;
1120 }
1121
1122 static int swap_load_proc_swaps(Manager *m, bool set_flags) {
1123         unsigned i;
1124         int r = 0;
1125
1126         assert(m);
1127
1128         rewind(m->proc_swaps);
1129
1130         (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
1131
1132         for (i = 1;; i++) {
1133                 _cleanup_free_ char *dev = NULL, *d = NULL;
1134                 int prio = 0, k;
1135
1136                 k = fscanf(m->proc_swaps,
1137                            "%ms "  /* device/file */
1138                            "%*s "  /* type of swap */
1139                            "%*s "  /* swap size */
1140                            "%*s "  /* used */
1141                            "%i\n", /* priority */
1142                            &dev, &prio);
1143                 if (k != 2) {
1144                         if (k == EOF)
1145                                 break;
1146
1147                         log_warning("Failed to parse /proc/swaps:%u", i);
1148                         continue;
1149                 }
1150
1151                 d = cunescape(dev);
1152                 if (!d)
1153                         return -ENOMEM;
1154
1155                 k = swap_process_new_swap(m, d, prio, set_flags);
1156                 if (k < 0)
1157                         r = k;
1158         }
1159
1160         return r;
1161 }
1162
1163 static int swap_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1164         Manager *m = userdata;
1165         Unit *u;
1166         int r;
1167
1168         assert(m);
1169         assert(revents & EPOLLPRI);
1170
1171         r = swap_load_proc_swaps(m, true);
1172         if (r < 0) {
1173                 log_error_errno(r, "Failed to reread /proc/swaps: %m");
1174
1175                 /* Reset flags, just in case, for late calls */
1176                 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1177                         Swap *swap = SWAP(u);
1178
1179                         swap->is_active = swap->just_activated = false;
1180                 }
1181
1182                 return 0;
1183         }
1184
1185         manager_dispatch_load_queue(m);
1186
1187         LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_SWAP]) {
1188                 Swap *swap = SWAP(u);
1189
1190                 if (!swap->is_active) {
1191                         /* This has just been deactivated */
1192
1193                         swap_unset_proc_swaps(swap);
1194
1195                         switch (swap->state) {
1196
1197                         case SWAP_ACTIVE:
1198                                 swap_enter_dead(swap, SWAP_SUCCESS);
1199                                 break;
1200
1201                         default:
1202                                 /* Fire again */
1203                                 swap_set_state(swap, swap->state);
1204                                 break;
1205                         }
1206
1207                 } else if (swap->just_activated) {
1208
1209                         /* New swap entry */
1210
1211                         switch (swap->state) {
1212
1213                         case SWAP_DEAD:
1214                         case SWAP_FAILED:
1215                                 swap_enter_active(swap, SWAP_SUCCESS);
1216                                 break;
1217
1218                         case SWAP_ACTIVATING:
1219                                 swap_set_state(swap, SWAP_ACTIVATING_DONE);
1220                                 break;
1221
1222                         default:
1223                                 /* Nothing really changed, but let's
1224                                  * issue an notification call
1225                                  * nonetheless, in case somebody is
1226                                  * waiting for this. */
1227                                 swap_set_state(swap, swap->state);
1228                                 break;
1229                         }
1230                 }
1231
1232                 /* Reset the flags for later calls */
1233                 swap->is_active = swap->just_activated = false;
1234         }
1235
1236         return 1;
1237 }
1238
1239 static Unit *swap_following(Unit *u) {
1240         Swap *s = SWAP(u);
1241         Swap *other, *first = NULL;
1242
1243         assert(s);
1244
1245         /* If the user configured the swap through /etc/fstab or
1246          * a device unit, follow that. */
1247
1248         if (s->from_fragment)
1249                 return NULL;
1250
1251         LIST_FOREACH_AFTER(same_devnode, other, s)
1252                 if (other->from_fragment)
1253                         return UNIT(other);
1254
1255         LIST_FOREACH_BEFORE(same_devnode, other, s)
1256                 if (other->from_fragment)
1257                         return UNIT(other);
1258
1259         /* Otherwise make everybody follow the unit that's named after
1260          * the swap device in the kernel */
1261
1262         if (streq_ptr(s->what, s->devnode))
1263                 return NULL;
1264
1265         LIST_FOREACH_AFTER(same_devnode, other, s)
1266                 if (streq_ptr(other->what, other->devnode))
1267                         return UNIT(other);
1268
1269         LIST_FOREACH_BEFORE(same_devnode, other, s) {
1270                 if (streq_ptr(other->what, other->devnode))
1271                         return UNIT(other);
1272
1273                 first = other;
1274         }
1275
1276         /* Fall back to the first on the list */
1277         return UNIT(first);
1278 }
1279
1280 static int swap_following_set(Unit *u, Set **_set) {
1281         Swap *s = SWAP(u), *other;
1282         Set *set;
1283         int r;
1284
1285         assert(s);
1286         assert(_set);
1287
1288         if (LIST_JUST_US(same_devnode, s)) {
1289                 *_set = NULL;
1290                 return 0;
1291         }
1292
1293         set = set_new(NULL);
1294         if (!set)
1295                 return -ENOMEM;
1296
1297         LIST_FOREACH_AFTER(same_devnode, other, s) {
1298                 r = set_put(set, other);
1299                 if (r < 0)
1300                         goto fail;
1301         }
1302
1303         LIST_FOREACH_BEFORE(same_devnode, other, s) {
1304                 r = set_put(set, other);
1305                 if (r < 0)
1306                         goto fail;
1307         }
1308
1309         *_set = set;
1310         return 1;
1311
1312 fail:
1313         set_free(set);
1314         return r;
1315 }
1316
1317 static void swap_shutdown(Manager *m) {
1318         assert(m);
1319
1320         m->swap_event_source = sd_event_source_unref(m->swap_event_source);
1321
1322         if (m->proc_swaps) {
1323                 fclose(m->proc_swaps);
1324                 m->proc_swaps = NULL;
1325         }
1326
1327         hashmap_free(m->swaps_by_devnode);
1328         m->swaps_by_devnode = NULL;
1329 }
1330
1331 static int swap_enumerate(Manager *m) {
1332         int r;
1333
1334         assert(m);
1335
1336         if (!m->proc_swaps) {
1337                 m->proc_swaps = fopen("/proc/swaps", "re");
1338                 if (!m->proc_swaps)
1339                         return errno == ENOENT ? 0 : -errno;
1340
1341                 r = sd_event_add_io(m->event, &m->swap_event_source, fileno(m->proc_swaps), EPOLLPRI, swap_dispatch_io, m);
1342                 if (r < 0)
1343                         goto fail;
1344
1345                 /* Dispatch this before we dispatch SIGCHLD, so that
1346                  * we always get the events from /proc/swaps before
1347                  * the SIGCHLD of /sbin/swapon. */
1348                 r = sd_event_source_set_priority(m->swap_event_source, -10);
1349                 if (r < 0)
1350                         goto fail;
1351         }
1352
1353         r = swap_load_proc_swaps(m, false);
1354         if (r < 0)
1355                 goto fail;
1356
1357         return 0;
1358
1359 fail:
1360         swap_shutdown(m);
1361         return r;
1362 }
1363
1364 int swap_process_new_device(Manager *m, struct udev_device *dev) {
1365         struct udev_list_entry *item = NULL, *first = NULL;
1366         _cleanup_free_ char *e = NULL;
1367         const char *dn;
1368         Swap *s;
1369         int r = 0;
1370
1371         assert(m);
1372         assert(dev);
1373
1374         dn = udev_device_get_devnode(dev);
1375         if (!dn)
1376                 return 0;
1377
1378         e = unit_name_from_path(dn, ".swap");
1379         if (!e)
1380                 return -ENOMEM;
1381
1382         s = hashmap_get(m->units, e);
1383         if (s)
1384                 r = swap_set_devnode(s, dn);
1385
1386         first = udev_device_get_devlinks_list_entry(dev);
1387         udev_list_entry_foreach(item, first) {
1388                 _cleanup_free_ char *n = NULL;
1389
1390                 n = unit_name_from_path(udev_list_entry_get_name(item), ".swap");
1391                 if (!n)
1392                         return -ENOMEM;
1393
1394                 s = hashmap_get(m->units, n);
1395                 if (s) {
1396                         int q;
1397
1398                         q = swap_set_devnode(s, dn);
1399                         if (q < 0)
1400                                 r = q;
1401                 }
1402         }
1403
1404         return r;
1405 }
1406
1407 int swap_process_removed_device(Manager *m, struct udev_device *dev) {
1408         const char *dn;
1409         int r = 0;
1410         Swap *s;
1411
1412         dn = udev_device_get_devnode(dev);
1413         if (!dn)
1414                 return 0;
1415
1416         while ((s = hashmap_get(m->swaps_by_devnode, dn))) {
1417                 int q;
1418
1419                 q = swap_set_devnode(s, NULL);
1420                 if (q < 0)
1421                         r = q;
1422         }
1423
1424         return r;
1425 }
1426
1427 static void swap_reset_failed(Unit *u) {
1428         Swap *s = SWAP(u);
1429
1430         assert(s);
1431
1432         if (s->state == SWAP_FAILED)
1433                 swap_set_state(s, SWAP_DEAD);
1434
1435         s->result = SWAP_SUCCESS;
1436 }
1437
1438 static int swap_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1439         return unit_kill_common(u, who, signo, -1, SWAP(u)->control_pid, error);
1440 }
1441
1442 static int swap_get_timeout(Unit *u, uint64_t *timeout) {
1443         Swap *s = SWAP(u);
1444         int r;
1445
1446         if (!s->timer_event_source)
1447                 return 0;
1448
1449         r = sd_event_source_get_time(s->timer_event_source, timeout);
1450         if (r < 0)
1451                 return r;
1452
1453         return 1;
1454 }
1455
1456 static bool swap_supported(Manager *m) {
1457         static int supported = -1;
1458
1459         /* If swap support is not available in the kernel, or we are
1460          * running in a container we don't support swap units, and any
1461          * attempts to starting one should fail immediately. */
1462
1463         if (supported < 0)
1464                 supported =
1465                         access("/proc/swaps", F_OK) >= 0 &&
1466                         detect_container(NULL) <= 0;
1467
1468         return supported;
1469 }
1470
1471 static const char* const swap_state_table[_SWAP_STATE_MAX] = {
1472         [SWAP_DEAD] = "dead",
1473         [SWAP_ACTIVATING] = "activating",
1474         [SWAP_ACTIVATING_DONE] = "activating-done",
1475         [SWAP_ACTIVE] = "active",
1476         [SWAP_DEACTIVATING] = "deactivating",
1477         [SWAP_ACTIVATING_SIGTERM] = "activating-sigterm",
1478         [SWAP_ACTIVATING_SIGKILL] = "activating-sigkill",
1479         [SWAP_DEACTIVATING_SIGTERM] = "deactivating-sigterm",
1480         [SWAP_DEACTIVATING_SIGKILL] = "deactivating-sigkill",
1481         [SWAP_FAILED] = "failed"
1482 };
1483
1484 DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
1485
1486 static const char* const swap_exec_command_table[_SWAP_EXEC_COMMAND_MAX] = {
1487         [SWAP_EXEC_ACTIVATE] = "ExecActivate",
1488         [SWAP_EXEC_DEACTIVATE] = "ExecDeactivate",
1489 };
1490
1491 DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
1492
1493 static const char* const swap_result_table[_SWAP_RESULT_MAX] = {
1494         [SWAP_SUCCESS] = "success",
1495         [SWAP_FAILURE_RESOURCES] = "resources",
1496         [SWAP_FAILURE_TIMEOUT] = "timeout",
1497         [SWAP_FAILURE_EXIT_CODE] = "exit-code",
1498         [SWAP_FAILURE_SIGNAL] = "signal",
1499         [SWAP_FAILURE_CORE_DUMP] = "core-dump"
1500 };
1501
1502 DEFINE_STRING_TABLE_LOOKUP(swap_result, SwapResult);
1503
1504 const UnitVTable swap_vtable = {
1505         .object_size = sizeof(Swap),
1506         .exec_context_offset = offsetof(Swap, exec_context),
1507         .cgroup_context_offset = offsetof(Swap, cgroup_context),
1508         .kill_context_offset = offsetof(Swap, kill_context),
1509         .exec_runtime_offset = offsetof(Swap, exec_runtime),
1510
1511         .sections =
1512                 "Unit\0"
1513                 "Swap\0"
1514                 "Install\0",
1515         .private_section = "Swap",
1516
1517         .no_alias = true,
1518         .no_instances = true,
1519
1520         .init = swap_init,
1521         .load = swap_load,
1522         .done = swap_done,
1523
1524         .coldplug = swap_coldplug,
1525
1526         .dump = swap_dump,
1527
1528         .start = swap_start,
1529         .stop = swap_stop,
1530
1531         .kill = swap_kill,
1532
1533         .get_timeout = swap_get_timeout,
1534
1535         .serialize = swap_serialize,
1536         .deserialize_item = swap_deserialize_item,
1537
1538         .active_state = swap_active_state,
1539         .sub_state_to_string = swap_sub_state_to_string,
1540
1541         .check_gc = swap_check_gc,
1542
1543         .sigchld_event = swap_sigchld_event,
1544
1545         .reset_failed = swap_reset_failed,
1546
1547         .bus_interface = "org.freedesktop.systemd1.Swap",
1548         .bus_vtable = bus_swap_vtable,
1549         .bus_set_property = bus_swap_set_property,
1550         .bus_commit_properties = bus_swap_commit_properties,
1551
1552         .following = swap_following,
1553         .following_set = swap_following_set,
1554
1555         .enumerate = swap_enumerate,
1556         .shutdown = swap_shutdown,
1557         .supported = swap_supported,
1558
1559         .status_message_formats = {
1560                 .starting_stopping = {
1561                         [0] = "Activating swap %s...",
1562                         [1] = "Deactivating swap %s...",
1563                 },
1564                 .finished_start_job = {
1565                         [JOB_DONE]       = "Activated swap %s.",
1566                         [JOB_FAILED]     = "Failed to activate swap %s.",
1567                         [JOB_DEPENDENCY] = "Dependency failed for %s.",
1568                         [JOB_TIMEOUT]    = "Timed out activating swap %s.",
1569                 },
1570                 .finished_stop_job = {
1571                         [JOB_DONE]       = "Deactivated swap %s.",
1572                         [JOB_FAILED]     = "Failed deactivating swap %s.",
1573                         [JOB_TIMEOUT]    = "Timed out deactivating swap %s.",
1574                 },
1575         },
1576 };