src/automount.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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU 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 <sys/mount.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <sys/epoll.h>
  28 #include <sys/stat.h>
  29 #include <linux/auto_fs4.h>
  30 #include <linux/auto_dev-ioctl.h>
  31
  32 #include "unit.h"
  33 #include "automount.h"
  34 #include "load-fragment.h"
  35 #include "load-dropin.h"
  36 #include "unit-name.h"
  37 #include "dbus-automount.h"
  38 #include "bus-errors.h"
  39 #include "special.h"
  40 #include "label.h"
  41
  42 static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = {
  43         [AUTOMOUNT_DEAD] = UNIT_INACTIVE,
  44         [AUTOMOUNT_WAITING] = UNIT_ACTIVE,
  45         [AUTOMOUNT_RUNNING] = UNIT_ACTIVE,
  46         [AUTOMOUNT_FAILED] = UNIT_FAILED
  47 };
  48
  49 static int open_dev_autofs(Manager *m);
  50
  51 static void automount_init(Unit *u) {
  52         Automount *a = AUTOMOUNT(u);
  53
  54         assert(u);
  55         assert(u->meta.load_state == UNIT_STUB);
  56
  57         a->pipe_watch.fd = a->pipe_fd = -1;
  58         a->pipe_watch.type = WATCH_INVALID;
  59
  60         a->directory_mode = 0755;
  61
  62         a->meta.ignore_on_isolate = true;
  63 }
  64
  65 static void repeat_unmout(const char *path) {
  66         assert(path);
  67
  68         for (;;) {
  69                 /* If there are multiple mounts on a mount point, this
  70                  * removes them all */
  71
  72                 if (umount2(path, MNT_DETACH) >= 0)
  73                         continue;
  74
  75                 if (errno != EINVAL)
  76                         log_error("Failed to unmount: %m");
  77
  78                 break;
  79         }
  80 }
  81
  82 static void unmount_autofs(Automount *a) {
  83         assert(a);
  84
  85         if (a->pipe_fd < 0)
  86                 return;
  87
  88         automount_send_ready(a, -EHOSTDOWN);
  89
  90         unit_unwatch_fd(UNIT(a), &a->pipe_watch);
  91         close_nointr_nofail(a->pipe_fd);
  92         a->pipe_fd = -1;
  93
  94         /* If we reload/reexecute things we keep the mount point
  95          * around */
  96         if (a->where &&
  97             (a->meta.manager->exit_code != MANAGER_RELOAD &&
  98              a->meta.manager->exit_code != MANAGER_REEXECUTE))
  99                 repeat_unmout(a->where);
 100 }
 101
 102 static void automount_done(Unit *u) {
 103         Automount *a = AUTOMOUNT(u);
 104
 105         assert(a);
 106
 107         unmount_autofs(a);
 108         a->mount = NULL;
 109
 110         free(a->where);
 111         a->where = NULL;
 112
 113         set_free(a->tokens);
 114         a->tokens = NULL;
 115 }
 116
 117 int automount_add_one_mount_link(Automount *a, Mount *m) {
 118         int r;
 119
 120         assert(a);
 121         assert(m);
 122
 123         if (a->meta.load_state != UNIT_LOADED ||
 124             m->meta.load_state != UNIT_LOADED)
 125                 return 0;
 126
 127         if (!path_startswith(a->where, m->where))
 128                 return 0;
 129
 130         if (path_equal(a->where, m->where))
 131                 return 0;
 132
 133         if ((r = unit_add_two_dependencies(UNIT(a), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 134                 return r;
 135
 136         return 0;
 137 }
 138
 139 static int automount_add_mount_links(Automount *a) {
 140         Meta *other;
 141         int r;
 142
 143         assert(a);
 144
 145         LIST_FOREACH(units_per_type, other, a->meta.manager->units_per_type[UNIT_MOUNT])
 146                 if ((r = automount_add_one_mount_link(a, (Mount*) other)) < 0)
 147                         return r;
 148
 149         return 0;
 150 }
 151
 152 static int automount_add_default_dependencies(Automount *a) {
 153         int r;
 154
 155         assert(a);
 156
 157         if (a->meta.manager->running_as == MANAGER_SYSTEM) {
 158
 159                 if ((r = unit_add_dependency_by_name(UNIT(a), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0)
 160                         return r;
 161
 162                 if ((r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 163                         return r;
 164         }
 165
 166         return 0;
 167 }
 168
 169 static int automount_verify(Automount *a) {
 170         bool b;
 171         char *e;
 172         assert(a);
 173
 174         if (a->meta.load_state != UNIT_LOADED)
 175                 return 0;
 176
 177         if (path_equal(a->where, "/")) {
 178                 log_error("Cannot have an automount unit for the root directory. Refusing.");
 179                 return -EINVAL;
 180         }
 181
 182         if (!(e = unit_name_from_path(a->where, ".automount")))
 183                 return -ENOMEM;
 184
 185         b = unit_has_name(UNIT(a), e);
 186         free(e);
 187
 188         if (!b) {
 189                 log_error("%s's Where setting doesn't match unit name. Refusing.", a->meta.id);
 190                 return -EINVAL;
 191         }
 192
 193         return 0;
 194 }
 195
 196 static int automount_load(Unit *u) {
 197         int r;
 198         Automount *a = AUTOMOUNT(u);
 199
 200         assert(u);
 201         assert(u->meta.load_state == UNIT_STUB);
 202
 203         /* Load a .automount file */
 204         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 205                 return r;
 206
 207         if (u->meta.load_state == UNIT_LOADED) {
 208
 209                 if (!a->where)
 210                         if (!(a->where = unit_name_to_path(u->meta.id)))
 211                                 return -ENOMEM;
 212
 213                 path_kill_slashes(a->where);
 214
 215                 if ((r = automount_add_mount_links(a)) < 0)
 216                         return r;
 217
 218                 if ((r = unit_load_related_unit(u, ".mount", (Unit**) &a->mount)) < 0)
 219                         return r;
 220
 221                 if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(a->mount), true)) < 0)
 222                         return r;
 223
 224                 if (a->meta.default_dependencies)
 225                         if ((r = automount_add_default_dependencies(a)) < 0)
 226                                 return r;
 227         }
 228
 229         return automount_verify(a);
 230 }
 231
 232 static void automount_set_state(Automount *a, AutomountState state) {
 233         AutomountState old_state;
 234         assert(a);
 235
 236         old_state = a->state;
 237         a->state = state;
 238
 239         if (state != AUTOMOUNT_WAITING &&
 240             state != AUTOMOUNT_RUNNING)
 241                 unmount_autofs(a);
 242
 243         if (state != old_state)
 244                 log_debug("%s changed %s -> %s",
 245                           a->meta.id,
 246                           automount_state_to_string(old_state),
 247                           automount_state_to_string(state));
 248
 249         unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state], true);
 250 }
 251
 252 static int automount_coldplug(Unit *u) {
 253         Automount *a = AUTOMOUNT(u);
 254         int r;
 255
 256         assert(a);
 257         assert(a->state == AUTOMOUNT_DEAD);
 258
 259         if (a->deserialized_state != a->state) {
 260
 261                 if ((r = open_dev_autofs(u->meta.manager)) < 0)
 262                         return r;
 263
 264                 if (a->deserialized_state == AUTOMOUNT_WAITING ||
 265                     a->deserialized_state == AUTOMOUNT_RUNNING) {
 266
 267                         assert(a->pipe_fd >= 0);
 268
 269                         if ((r = unit_watch_fd(UNIT(a), a->pipe_fd, EPOLLIN, &a->pipe_watch)) < 0)
 270                                 return r;
 271                 }
 272
 273                 automount_set_state(a, a->deserialized_state);
 274         }
 275
 276         return 0;
 277 }
 278
 279 static void automount_dump(Unit *u, FILE *f, const char *prefix) {
 280         Automount *a = AUTOMOUNT(u);
 281
 282         assert(a);
 283
 284         fprintf(f,
 285                 "%sAutomount State: %s\n"
 286                 "%sWhere: %s\n"
 287                 "%sDirectoryMode: %04o\n",
 288                 prefix, automount_state_to_string(a->state),
 289                 prefix, a->where,
 290                 prefix, a->directory_mode);
 291 }
 292
 293 static void automount_enter_dead(Automount *a, bool success) {
 294         assert(a);
 295
 296         if (!success)
 297                 a->failure = true;
 298
 299         automount_set_state(a, a->failure ? AUTOMOUNT_FAILED : AUTOMOUNT_DEAD);
 300 }
 301
 302 static int open_dev_autofs(Manager *m) {
 303         struct autofs_dev_ioctl param;
 304
 305         assert(m);
 306
 307         if (m->dev_autofs_fd >= 0)
 308                 return m->dev_autofs_fd;
 309
 310         label_fix("/dev/autofs", false);
 311
 312         if ((m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY)) < 0) {
 313                 log_error("Failed to open /dev/autofs: %s", strerror(errno));
 314                 return -errno;
 315         }
 316
 317         init_autofs_dev_ioctl(&param);
 318         if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, &param) < 0) {
 319                 close_nointr_nofail(m->dev_autofs_fd);
 320                 m->dev_autofs_fd = -1;
 321                 return -errno;
 322         }
 323
 324         log_debug("Autofs kernel version %i.%i", param.ver_major, param.ver_minor);
 325
 326         return m->dev_autofs_fd;
 327 }
 328
 329 static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) {
 330         struct autofs_dev_ioctl *param;
 331         size_t l;
 332         int r;
 333
 334         assert(dev_autofs_fd >= 0);
 335         assert(where);
 336
 337         l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1;
 338
 339         if (!(param = malloc(l)))
 340                 return -ENOMEM;
 341
 342         init_autofs_dev_ioctl(param);
 343         param->size = l;
 344         param->ioctlfd = -1;
 345         param->openmount.devid = devid;
 346         strcpy(param->path, where);
 347
 348         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0) {
 349                 r = -errno;
 350                 goto finish;
 351         }
 352
 353         if (param->ioctlfd < 0) {
 354                 r = -EIO;
 355                 goto finish;
 356         }
 357
 358         fd_cloexec(param->ioctlfd, true);
 359         r = param->ioctlfd;
 360
 361 finish:
 362         free(param);
 363         return r;
 364 }
 365
 366 static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) {
 367         uint32_t major, minor;
 368         struct autofs_dev_ioctl param;
 369
 370         assert(dev_autofs_fd >= 0);
 371         assert(ioctl_fd >= 0);
 372
 373         init_autofs_dev_ioctl(&param);
 374         param.ioctlfd = ioctl_fd;
 375
 376         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, &param) < 0)
 377                 return -errno;
 378
 379         major = param.protover.version;
 380
 381         init_autofs_dev_ioctl(&param);
 382         param.ioctlfd = ioctl_fd;
 383
 384         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, &param) < 0)
 385                 return -errno;
 386
 387         minor = param.protosubver.sub_version;
 388
 389         log_debug("Autofs protocol version %i.%i", major, minor);
 390         return 0;
 391 }
 392
 393 static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, time_t sec) {
 394         struct autofs_dev_ioctl param;
 395
 396         assert(dev_autofs_fd >= 0);
 397         assert(ioctl_fd >= 0);
 398
 399         init_autofs_dev_ioctl(&param);
 400         param.ioctlfd = ioctl_fd;
 401         param.timeout.timeout = sec;
 402
 403         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, &param) < 0)
 404                 return -errno;
 405
 406         return 0;
 407 }
 408
 409 static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) {
 410         struct autofs_dev_ioctl param;
 411
 412         assert(dev_autofs_fd >= 0);
 413         assert(ioctl_fd >= 0);
 414
 415         init_autofs_dev_ioctl(&param);
 416         param.ioctlfd = ioctl_fd;
 417
 418         if (status) {
 419                 param.fail.token = token;
 420                 param.fail.status = status;
 421         } else
 422                 param.ready.token = token;
 423
 424         if (ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, &param) < 0)
 425                 return -errno;
 426
 427         return 0;
 428 }
 429
 430 int automount_send_ready(Automount *a, int status) {
 431         int ioctl_fd, r;
 432         unsigned token;
 433
 434         assert(a);
 435         assert(status <= 0);
 436
 437         if (set_isempty(a->tokens))
 438                 return 0;
 439
 440         if ((ioctl_fd = open_ioctl_fd(a->meta.manager->dev_autofs_fd, a->where, a->dev_id)) < 0) {
 441                 r = ioctl_fd;
 442                 goto fail;
 443         }
 444
 445         if (status)
 446                 log_debug("Sending failure: %s", strerror(-status));
 447         else
 448                 log_debug("Sending success.");
 449
 450         r = 0;
 451
 452         /* Autofs thankfully does not hand out 0 as a token */
 453         while ((token = PTR_TO_UINT(set_steal_first(a->tokens)))) {
 454                 int k;
 455
 456                 /* Autofs fun fact II:
 457                  *
 458                  * if you pass a positive status code here, the kernel will
 459                  * freeze! Yay! */
 460
 461                 if ((k = autofs_send_ready(a->meta.manager->dev_autofs_fd,
 462                                            ioctl_fd,
 463                                            token,
 464                                            status)) < 0)
 465                         r = k;
 466         }
 467
 468 fail:
 469         if (ioctl_fd >= 0)
 470                 close_nointr_nofail(ioctl_fd);
 471
 472         return r;
 473 }
 474
 475 static void automount_enter_waiting(Automount *a) {
 476         int p[2] = { -1, -1 };
 477         char name[32], options[128];
 478         bool mounted = false;
 479         int r, ioctl_fd = -1, dev_autofs_fd;
 480         struct stat st;
 481
 482         assert(a);
 483         assert(a->pipe_fd < 0);
 484         assert(a->where);
 485
 486         if (a->tokens)
 487                 set_clear(a->tokens);
 488
 489         if ((dev_autofs_fd = open_dev_autofs(a->meta.manager)) < 0) {
 490                 r = dev_autofs_fd;
 491                 goto fail;
 492         }
 493
 494         /* We knowingly ignore the results of this call */
 495         mkdir_p(a->where, 0555);
 496
 497         if (pipe2(p, O_NONBLOCK|O_CLOEXEC) < 0) {
 498                 r = -errno;
 499                 goto fail;
 500         }
 501
 502         snprintf(options, sizeof(options), "fd=%i,pgrp=%u,minproto=5,maxproto=5,direct", p[1], (unsigned) getpgrp());
 503         char_array_0(options);
 504
 505         snprintf(name, sizeof(name), "systemd-%u", (unsigned) getpid());
 506         char_array_0(name);
 507
 508         if (mount(name, a->where, "autofs", 0, options) < 0) {
 509                 r = -errno;
 510                 goto fail;
 511         }
 512
 513         mounted = true;
 514
 515         close_nointr_nofail(p[1]);
 516         p[1] = -1;
 517
 518         if (stat(a->where, &st) < 0) {
 519                 r = -errno;
 520                 goto fail;
 521         }
 522
 523         if ((ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev)) < 0) {
 524                 r = ioctl_fd;
 525                 goto fail;
 526         }
 527
 528         if ((r = autofs_protocol(dev_autofs_fd, ioctl_fd)) < 0)
 529                 goto fail;
 530
 531         if ((r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, 300)) < 0)
 532                 goto fail;
 533
 534         /* Autofs fun fact:
 535          *
 536          * Unless we close the ioctl fd here, for some weird reason
 537          * the direct mount will not receive events from the
 538          * kernel. */
 539
 540         close_nointr_nofail(ioctl_fd);
 541         ioctl_fd = -1;
 542
 543         if ((r = unit_watch_fd(UNIT(a), p[0], EPOLLIN, &a->pipe_watch)) < 0)
 544                 goto fail;
 545
 546         a->pipe_fd = p[0];
 547         a->dev_id = st.st_dev;
 548
 549         automount_set_state(a, AUTOMOUNT_WAITING);
 550
 551         return;
 552
 553 fail:
 554         assert_se(close_pipe(p) == 0);
 555
 556         if (ioctl_fd >= 0)
 557                 close_nointr_nofail(ioctl_fd);
 558
 559         if (mounted)
 560                 repeat_unmout(a->where);
 561
 562         log_error("Failed to initialize automounter: %s", strerror(-r));
 563         automount_enter_dead(a, false);
 564 }
 565
 566 static void automount_enter_runnning(Automount *a) {
 567         int r;
 568         struct stat st;
 569         DBusError error;
 570
 571         assert(a);
 572         assert(a->mount);
 573
 574         dbus_error_init(&error);
 575
 576         /* We don't take mount requests anymore if we are supposed to
 577          * shut down anyway */
 578         if (unit_pending_inactive(UNIT(a))) {
 579                 log_debug("Suppressing automount request on %s since unit stop is scheduled.", a->meta.id);
 580                 automount_send_ready(a, -EHOSTDOWN);
 581                 return;
 582         }
 583
 584         mkdir_p(a->where, a->directory_mode);
 585
 586         /* Before we do anything, let's see if somebody is playing games with us? */
 587         if (lstat(a->where, &st) < 0) {
 588                 log_warning("%s failed to stat automount point: %m", a->meta.id);
 589                 goto fail;
 590         }
 591
 592         if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id)
 593                 log_info("%s's automount point already active?", a->meta.id);
 594         else if ((r = manager_add_job(a->meta.manager, JOB_START, UNIT(a->mount), JOB_REPLACE, true, &error, NULL)) < 0) {
 595                 log_warning("%s failed to queue mount startup job: %s", a->meta.id, bus_error(&error, r));
 596                 goto fail;
 597         }
 598
 599         automount_set_state(a, AUTOMOUNT_RUNNING);
 600         return;
 601
 602 fail:
 603         automount_enter_dead(a, false);
 604         dbus_error_free(&error);
 605 }
 606
 607 static int automount_start(Unit *u) {
 608         Automount *a = AUTOMOUNT(u);
 609
 610         assert(a);
 611
 612         assert(a->state == AUTOMOUNT_DEAD || a->state == AUTOMOUNT_FAILED);
 613
 614         if (path_is_mount_point(a->where)) {
 615                 log_error("Path %s is already a mount point, refusing start for %s", a->where, u->meta.id);
 616                 return -EEXIST;
 617         }
 618
 619         if (a->mount->meta.load_state != UNIT_LOADED)
 620                 return -ENOENT;
 621
 622         a->failure = false;
 623         automount_enter_waiting(a);
 624         return 0;
 625 }
 626
 627 static int automount_stop(Unit *u) {
 628         Automount *a = AUTOMOUNT(u);
 629
 630         assert(a);
 631
 632         assert(a->state == AUTOMOUNT_WAITING || a->state == AUTOMOUNT_RUNNING);
 633
 634         automount_enter_dead(a, true);
 635         return 0;
 636 }
 637
 638 static int automount_serialize(Unit *u, FILE *f, FDSet *fds) {
 639         Automount *a = AUTOMOUNT(u);
 640         void *p;
 641         Iterator i;
 642
 643         assert(a);
 644         assert(f);
 645         assert(fds);
 646
 647         unit_serialize_item(u, f, "state", automount_state_to_string(a->state));
 648         unit_serialize_item(u, f, "failure", yes_no(a->failure));
 649         unit_serialize_item_format(u, f, "dev-id", "%u", (unsigned) a->dev_id);
 650
 651         SET_FOREACH(p, a->tokens, i)
 652                 unit_serialize_item_format(u, f, "token", "%u", PTR_TO_UINT(p));
 653
 654         if (a->pipe_fd >= 0) {
 655                 int copy;
 656
 657                 if ((copy = fdset_put_dup(fds, a->pipe_fd)) < 0)
 658                         return copy;
 659
 660                 unit_serialize_item_format(u, f, "pipe-fd", "%i", copy);
 661         }
 662
 663         return 0;
 664 }
 665
 666 static int automount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 667         Automount *a = AUTOMOUNT(u);
 668         int r;
 669
 670         assert(a);
 671         assert(fds);
 672
 673         if (streq(key, "state")) {
 674                 AutomountState state;
 675
 676                 if ((state = automount_state_from_string(value)) < 0)
 677                         log_debug("Failed to parse state value %s", value);
 678                 else
 679                         a->deserialized_state = state;
 680         } else if (streq(key, "failure")) {
 681                 int b;
 682
 683                 if ((b = parse_boolean(value)) < 0)
 684                         log_debug("Failed to parse failure value %s", value);
 685                 else
 686                         a->failure = b || a->failure;
 687         } else if (streq(key, "dev-id")) {
 688                 unsigned d;
 689
 690                 if (safe_atou(value, &d) < 0)
 691                         log_debug("Failed to parse dev-id value %s", value);
 692                 else
 693                         a->dev_id = (unsigned) d;
 694         } else if (streq(key, "token")) {
 695                 unsigned token;
 696
 697                 if (safe_atou(value, &token) < 0)
 698                         log_debug("Failed to parse token value %s", value);
 699                 else {
 700                         if (!a->tokens)
 701                                 if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func)))
 702                                         return -ENOMEM;
 703
 704                         if ((r = set_put(a->tokens, UINT_TO_PTR(token))) < 0)
 705                                 return r;
 706                 }
 707         } else if (streq(key, "pipe-fd")) {
 708                 int fd;
 709
 710                 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
 711                         log_debug("Failed to parse pipe-fd value %s", value);
 712                 else {
 713                         if (a->pipe_fd >= 0)
 714                                 close_nointr_nofail(a->pipe_fd);
 715
 716                         a->pipe_fd = fdset_remove(fds, fd);
 717                 }
 718         } else
 719                 log_debug("Unknown serialization key '%s'", key);
 720
 721         return 0;
 722 }
 723
 724 static UnitActiveState automount_active_state(Unit *u) {
 725         assert(u);
 726
 727         return state_translation_table[AUTOMOUNT(u)->state];
 728 }
 729
 730 static const char *automount_sub_state_to_string(Unit *u) {
 731         assert(u);
 732
 733         return automount_state_to_string(AUTOMOUNT(u)->state);
 734 }
 735
 736 static bool automount_check_gc(Unit *u) {
 737         Automount *a = AUTOMOUNT(u);
 738
 739         assert(a);
 740
 741         if (!a->mount)
 742                 return false;
 743
 744         return UNIT_VTABLE(UNIT(a->mount))->check_gc(UNIT(a->mount));
 745 }
 746
 747 static void automount_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 748         Automount *a = AUTOMOUNT(u);
 749         union autofs_v5_packet_union packet;
 750         ssize_t l;
 751         int r;
 752
 753         assert(a);
 754         assert(fd == a->pipe_fd);
 755
 756         if (events != EPOLLIN) {
 757                 log_error("Got invalid poll event on pipe.");
 758                 goto fail;
 759         }
 760
 761         if ((l = loop_read(a->pipe_fd, &packet, sizeof(packet), true)) != sizeof(packet)) {
 762                 log_error("Invalid read from pipe: %s", l < 0 ? strerror(-l) : "short read");
 763                 goto fail;
 764         }
 765
 766         switch (packet.hdr.type) {
 767
 768         case autofs_ptype_missing_direct:
 769
 770                 if (packet.v5_packet.pid > 0) {
 771                         char *p = NULL;
 772
 773                         get_process_name(packet.v5_packet.pid, &p);
 774                         log_debug("Got direct mount request for %s, triggered by %lu (%s)", packet.v5_packet.name, (unsigned long) packet.v5_packet.pid, strna(p));
 775                         free(p);
 776
 777                 } else
 778                         log_debug("Got direct mount request for %s", packet.v5_packet.name);
 779
 780                 if (!a->tokens)
 781                         if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func))) {
 782                                 log_error("Failed to allocate token set.");
 783                                 goto fail;
 784                         }
 785
 786                 if ((r = set_put(a->tokens, UINT_TO_PTR(packet.v5_packet.wait_queue_token))) < 0) {
 787                         log_error("Failed to remember token: %s", strerror(-r));
 788                         goto fail;
 789                 }
 790
 791                 automount_enter_runnning(a);
 792                 break;
 793
 794         default:
 795                 log_error("Received unknown automount request %i", packet.hdr.type);
 796                 break;
 797         }
 798
 799         return;
 800
 801 fail:
 802         automount_enter_dead(a, false);
 803 }
 804
 805 static void automount_shutdown(Manager *m) {
 806         assert(m);
 807
 808         if (m->dev_autofs_fd >= 0)
 809                 close_nointr_nofail(m->dev_autofs_fd);
 810 }
 811
 812 static void automount_reset_failed(Unit *u) {
 813         Automount *a = AUTOMOUNT(u);
 814
 815         assert(a);
 816
 817         if (a->state == AUTOMOUNT_FAILED)
 818                 automount_set_state(a, AUTOMOUNT_DEAD);
 819
 820         a->failure = false;
 821 }
 822
 823 static const char* const automount_state_table[_AUTOMOUNT_STATE_MAX] = {
 824         [AUTOMOUNT_DEAD] = "dead",
 825         [AUTOMOUNT_WAITING] = "waiting",
 826         [AUTOMOUNT_RUNNING] = "running",
 827         [AUTOMOUNT_FAILED] = "failed"
 828 };
 829
 830 DEFINE_STRING_TABLE_LOOKUP(automount_state, AutomountState);
 831
 832 const UnitVTable automount_vtable = {
 833         .suffix = ".automount",
 834
 835         .no_alias = true,
 836         .no_instances = true,
 837
 838         .init = automount_init,
 839         .load = automount_load,
 840         .done = automount_done,
 841
 842         .coldplug = automount_coldplug,
 843
 844         .dump = automount_dump,
 845
 846         .start = automount_start,
 847         .stop = automount_stop,
 848
 849         .serialize = automount_serialize,
 850         .deserialize_item = automount_deserialize_item,
 851
 852         .active_state = automount_active_state,
 853         .sub_state_to_string = automount_sub_state_to_string,
 854
 855         .check_gc = automount_check_gc,
 856
 857         .fd_event = automount_fd_event,
 858
 859         .reset_failed = automount_reset_failed,
 860
 861         .bus_interface = "org.freedesktop.systemd1.Automount",
 862         .bus_message_handler = bus_automount_message_handler,
 863
 864         .shutdown = automount_shutdown
 865 };