src/automount.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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
  41 static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = {
  42         [AUTOMOUNT_DEAD] = UNIT_INACTIVE,
  43         [AUTOMOUNT_WAITING] = UNIT_ACTIVE,
  44         [AUTOMOUNT_RUNNING] = UNIT_ACTIVE,
  45         [AUTOMOUNT_MAINTENANCE] = UNIT_MAINTENANCE
  46 };
  47
  48 static int open_dev_autofs(Manager *m);
  49
  50 static void automount_init(Unit *u) {
  51         Automount *a = AUTOMOUNT(u);
  52
  53         assert(u);
  54         assert(u->meta.load_state == UNIT_STUB);
  55
  56         a->pipe_watch.fd = a->pipe_fd = -1;
  57         a->pipe_watch.type = WATCH_INVALID;
  58
  59         a->directory_mode = 0755;
  60 }
  61
  62 static void repeat_unmout(const char *path) {
  63         assert(path);
  64
  65         for (;;) {
  66                 /* If there are multiple mounts on a mount point, this
  67                  * removes them all */
  68
  69                 if (umount2(path, MNT_DETACH) >= 0)
  70                         continue;
  71
  72                 if (errno != EINVAL)
  73                         log_error("Failed to unmount: %m");
  74
  75                 break;
  76         }
  77 }
  78
  79 static void unmount_autofs(Automount *a) {
  80         assert(a);
  81
  82         if (a->pipe_fd < 0)
  83                 return;
  84
  85         automount_send_ready(a, -EHOSTDOWN);
  86
  87         unit_unwatch_fd(UNIT(a), &a->pipe_watch);
  88         close_nointr_nofail(a->pipe_fd);
  89         a->pipe_fd = -1;
  90
  91         /* If we reload/reexecute things we keep the mount point
  92          * around */
  93         if (a->where &&
  94             (a->meta.manager->exit_code != MANAGER_RELOAD &&
  95              a->meta.manager->exit_code != MANAGER_REEXECUTE))
  96                 repeat_unmout(a->where);
  97 }
  98
  99 static void automount_done(Unit *u) {
 100         Automount *a = AUTOMOUNT(u);
 101
 102         assert(a);
 103
 104         unmount_autofs(a);
 105         a->mount = NULL;
 106
 107         free(a->where);
 108         a->where = NULL;
 109
 110         set_free(a->tokens);
 111         a->tokens = NULL;
 112 }
 113
 114 int automount_add_one_mount_link(Automount *a, Mount *m) {
 115         int r;
 116
 117         assert(a);
 118         assert(m);
 119
 120         if (a->meta.load_state != UNIT_LOADED ||
 121             m->meta.load_state != UNIT_LOADED)
 122                 return 0;
 123
 124         if (!path_startswith(a->where, m->where))
 125                 return 0;
 126
 127         if (path_equal(a->where, m->where))
 128                 return 0;
 129
 130         if ((r = unit_add_two_dependencies(UNIT(a), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 131                 return r;
 132
 133         return 0;
 134 }
 135
 136 static int automount_add_mount_links(Automount *a) {
 137         Meta *other;
 138         int r;
 139
 140         assert(a);
 141
 142         LIST_FOREACH(units_per_type, other, a->meta.manager->units_per_type[UNIT_MOUNT])
 143                 if ((r = automount_add_one_mount_link(a, (Mount*) other)) < 0)
 144                         return r;
 145
 146         return 0;
 147 }
 148
 149 static int automount_verify(Automount *a) {
 150         bool b;
 151         char *e;
 152         assert(a);
 153
 154         if (a->meta.load_state != UNIT_LOADED)
 155                 return 0;
 156
 157         if (path_equal(a->where, "/")) {
 158                 log_error("Cannot have an automount unit for the root directory. Refusing.");
 159                 return -EINVAL;
 160         }
 161
 162         if (!(e = unit_name_from_path(a->where, ".automount")))
 163                 return -ENOMEM;
 164
 165         b = unit_has_name(UNIT(a), e);
 166         free(e);
 167
 168         if (!b) {
 169                 log_error("%s's Where setting doesn't match unit name. Refusing.", a->meta.id);
 170                 return -EINVAL;
 171         }
 172
 173         return 0;
 174 }
 175
 176 static int automount_load(Unit *u) {
 177         int r;
 178         Automount *a = AUTOMOUNT(u);
 179
 180         assert(u);
 181         assert(u->meta.load_state == UNIT_STUB);
 182
 183         /* Load a .automount file */
 184         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 185                 return r;
 186
 187         if (u->meta.load_state == UNIT_LOADED) {
 188
 189                 if (!a->where)
 190                         if (!(a->where = unit_name_to_path(u->meta.id)))
 191                                 return -ENOMEM;
 192
 193                 path_kill_slashes(a->where);
 194
 195                 if ((r = automount_add_mount_links(a)) < 0)
 196                         return r;
 197
 198                 if ((r = unit_load_related_unit(u, ".mount", (Unit**) &a->mount)) < 0)
 199                         return r;
 200
 201                 if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(a->mount), true)) < 0)
 202                         return r;
 203
 204                 if (a->meta.default_dependencies)
 205                         if ((r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 206                                 return r;
 207         }
 208
 209         return automount_verify(a);
 210 }
 211
 212 static void automount_set_state(Automount *a, AutomountState state) {
 213         AutomountState old_state;
 214         assert(a);
 215
 216         old_state = a->state;
 217         a->state = state;
 218
 219         if (state != AUTOMOUNT_WAITING &&
 220             state != AUTOMOUNT_RUNNING)
 221                 unmount_autofs(a);
 222
 223         if (state != old_state)
 224                 log_debug("%s changed %s -> %s",
 225                           a->meta.id,
 226                           automount_state_to_string(old_state),
 227                           automount_state_to_string(state));
 228
 229         unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state]);
 230 }
 231
 232 static int automount_coldplug(Unit *u) {
 233         Automount *a = AUTOMOUNT(u);
 234         int r;
 235
 236         assert(a);
 237         assert(a->state == AUTOMOUNT_DEAD);
 238
 239         if (a->deserialized_state != a->state) {
 240
 241                 if ((r = open_dev_autofs(u->meta.manager)) < 0)
 242                         return r;
 243
 244                 if (a->deserialized_state == AUTOMOUNT_WAITING ||
 245                     a->deserialized_state == AUTOMOUNT_RUNNING) {
 246
 247                         assert(a->pipe_fd >= 0);
 248
 249                         if ((r = unit_watch_fd(UNIT(a), a->pipe_fd, EPOLLIN, &a->pipe_watch)) < 0)
 250                                 return r;
 251                 }
 252
 253                 automount_set_state(a, a->deserialized_state);
 254         }
 255
 256         return 0;
 257 }
 258
 259 static void automount_dump(Unit *u, FILE *f, const char *prefix) {
 260         Automount *a = AUTOMOUNT(u);
 261
 262         assert(a);
 263
 264         fprintf(f,
 265                 "%sAutomount State: %s\n"
 266                 "%sWhere: %s\n"
 267                 "%sDirectoryMode: %04o\n",
 268                 prefix, automount_state_to_string(a->state),
 269                 prefix, a->where,
 270                 prefix, a->directory_mode);
 271 }
 272
 273 static void automount_enter_dead(Automount *a, bool success) {
 274         assert(a);
 275
 276         if (!success)
 277                 a->failure = true;
 278
 279         automount_set_state(a, a->failure ? AUTOMOUNT_MAINTENANCE : AUTOMOUNT_DEAD);
 280 }
 281
 282 static int open_dev_autofs(Manager *m) {
 283         struct autofs_dev_ioctl param;
 284
 285         assert(m);
 286
 287         if (m->dev_autofs_fd >= 0)
 288                 return m->dev_autofs_fd;
 289
 290         if ((m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY)) < 0) {
 291                 log_error("Failed to open /dev/autofs: %s", strerror(errno));
 292                 return -errno;
 293         }
 294
 295         init_autofs_dev_ioctl(&param);
 296         if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, &param) < 0) {
 297                 close_nointr_nofail(m->dev_autofs_fd);
 298                 m->dev_autofs_fd = -1;
 299                 return -errno;
 300         }
 301
 302         log_debug("Autofs kernel version %i.%i", param.ver_major, param.ver_minor);
 303
 304         return m->dev_autofs_fd;
 305 }
 306
 307 static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) {
 308         struct autofs_dev_ioctl *param;
 309         size_t l;
 310         int r;
 311
 312         assert(dev_autofs_fd >= 0);
 313         assert(where);
 314
 315         l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1;
 316
 317         if (!(param = malloc(l)))
 318                 return -ENOMEM;
 319
 320         init_autofs_dev_ioctl(param);
 321         param->size = l;
 322         param->ioctlfd = -1;
 323         param->openmount.devid = devid;
 324         strcpy(param->path, where);
 325
 326         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0) {
 327                 r = -errno;
 328                 goto finish;
 329         }
 330
 331         if (param->ioctlfd < 0) {
 332                 r = -EIO;
 333                 goto finish;
 334         }
 335
 336         fd_cloexec(param->ioctlfd, true);
 337         r = param->ioctlfd;
 338
 339 finish:
 340         free(param);
 341         return r;
 342 }
 343
 344 static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) {
 345         uint32_t major, minor;
 346         struct autofs_dev_ioctl param;
 347
 348         assert(dev_autofs_fd >= 0);
 349         assert(ioctl_fd >= 0);
 350
 351         init_autofs_dev_ioctl(&param);
 352         param.ioctlfd = ioctl_fd;
 353
 354         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, &param) < 0)
 355                 return -errno;
 356
 357         major = param.protover.version;
 358
 359         init_autofs_dev_ioctl(&param);
 360         param.ioctlfd = ioctl_fd;
 361
 362         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, &param) < 0)
 363                 return -errno;
 364
 365         minor = param.protosubver.sub_version;
 366
 367         log_debug("Autofs protocol version %i.%i", major, minor);
 368         return 0;
 369 }
 370
 371 static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, time_t sec) {
 372         struct autofs_dev_ioctl param;
 373
 374         assert(dev_autofs_fd >= 0);
 375         assert(ioctl_fd >= 0);
 376
 377         init_autofs_dev_ioctl(&param);
 378         param.ioctlfd = ioctl_fd;
 379         param.timeout.timeout = sec;
 380
 381         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, &param) < 0)
 382                 return -errno;
 383
 384         return 0;
 385 }
 386
 387 static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) {
 388         struct autofs_dev_ioctl param;
 389
 390         assert(dev_autofs_fd >= 0);
 391         assert(ioctl_fd >= 0);
 392
 393         init_autofs_dev_ioctl(&param);
 394         param.ioctlfd = ioctl_fd;
 395
 396         if (status) {
 397                 param.fail.token = token;
 398                 param.fail.status = status;
 399         } else
 400                 param.ready.token = token;
 401
 402         if (ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, &param) < 0)
 403                 return -errno;
 404
 405         return 0;
 406 }
 407
 408 int automount_send_ready(Automount *a, int status) {
 409         int ioctl_fd, r;
 410         unsigned token;
 411
 412         assert(a);
 413         assert(status <= 0);
 414
 415         if (set_isempty(a->tokens))
 416                 return 0;
 417
 418         if ((ioctl_fd = open_ioctl_fd(a->meta.manager->dev_autofs_fd, a->where, a->dev_id)) < 0) {
 419                 r = ioctl_fd;
 420                 goto fail;
 421         }
 422
 423         if (status)
 424                 log_debug("Sending failure: %s", strerror(-status));
 425         else
 426                 log_debug("Sending success.");
 427
 428         /* Autofs thankfully does not hand out 0 as a token */
 429         while ((token = PTR_TO_UINT(set_steal_first(a->tokens)))) {
 430                 int k;
 431
 432                 /* Autofs fun fact II:
 433                  *
 434                  * if you pass a positive status code here, the kernel will
 435                  * freeze! Yay! */
 436
 437                 if ((k = autofs_send_ready(a->meta.manager->dev_autofs_fd,
 438                                            ioctl_fd,
 439                                            token,
 440                                            status)) < 0)
 441                         r = k;
 442         }
 443
 444         r = 0;
 445
 446 fail:
 447         if (ioctl_fd >= 0)
 448                 close_nointr_nofail(ioctl_fd);
 449
 450         return r;
 451 }
 452
 453 static void automount_enter_waiting(Automount *a) {
 454         int p[2] = { -1, -1 };
 455         char name[32], options[128];
 456         bool mounted = false;
 457         int r, ioctl_fd = -1, dev_autofs_fd;
 458         struct stat st;
 459
 460         assert(a);
 461         assert(a->pipe_fd < 0);
 462         assert(a->where);
 463
 464         if (a->tokens)
 465                 set_clear(a->tokens);
 466
 467         if ((dev_autofs_fd = open_dev_autofs(a->meta.manager)) < 0) {
 468                 r = dev_autofs_fd;
 469                 goto fail;
 470         }
 471
 472         /* We knowingly ignore the results of this call */
 473         mkdir_p(a->where, 0555);
 474
 475         if (pipe2(p, O_NONBLOCK|O_CLOEXEC) < 0) {
 476                 r = -errno;
 477                 goto fail;
 478         }
 479
 480         snprintf(options, sizeof(options), "fd=%i,pgrp=%u,minproto=5,maxproto=5,direct", p[1], (unsigned) getpgrp());
 481         char_array_0(options);
 482
 483         snprintf(name, sizeof(name), "systemd-%u", (unsigned) getpid());
 484         char_array_0(name);
 485
 486         if (mount(name, a->where, "autofs", 0, options) < 0) {
 487                 r = -errno;
 488                 goto fail;
 489         }
 490
 491         mounted = true;
 492
 493         close_nointr_nofail(p[1]);
 494         p[1] = -1;
 495
 496         if (stat(a->where, &st) < 0) {
 497                 r = -errno;
 498                 goto fail;
 499         }
 500
 501         if ((ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev)) < 0) {
 502                 r = ioctl_fd;
 503                 goto fail;
 504         }
 505
 506         if ((r = autofs_protocol(dev_autofs_fd, ioctl_fd)) < 0)
 507                 goto fail;
 508
 509         if ((r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, 300)) < 0)
 510                 goto fail;
 511
 512         /* Autofs fun fact:
 513          *
 514          * Unless we close the ioctl fd here, for some weird reason
 515          * the direct mount will not receive events from the
 516          * kernel. */
 517
 518         close_nointr_nofail(ioctl_fd);
 519         ioctl_fd = -1;
 520
 521         if ((r = unit_watch_fd(UNIT(a), p[0], EPOLLIN, &a->pipe_watch)) < 0)
 522                 goto fail;
 523
 524         a->pipe_fd = p[0];
 525         a->dev_id = st.st_dev;
 526
 527         automount_set_state(a, AUTOMOUNT_WAITING);
 528
 529         return;
 530
 531 fail:
 532         assert_se(close_pipe(p) == 0);
 533
 534         if (ioctl_fd >= 0)
 535                 close_nointr_nofail(ioctl_fd);
 536
 537         if (mounted)
 538                 repeat_unmout(a->where);
 539
 540         log_error("Failed to initialize automounter: %s", strerror(-r));
 541         automount_enter_dead(a, false);
 542 }
 543
 544 static void automount_enter_runnning(Automount *a) {
 545         int r;
 546         struct stat st;
 547         DBusError error;
 548
 549         assert(a);
 550         assert(a->mount);
 551
 552         dbus_error_init(&error);
 553
 554         mkdir_p(a->where, a->directory_mode);
 555
 556         /* Before we do anything, let's see if somebody is playing games with us? */
 557         if (lstat(a->where, &st) < 0) {
 558                 log_warning("%s failed stat automount point: %m", a->meta.id);
 559                 goto fail;
 560         }
 561
 562         if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id)
 563                 log_info("%s's automount point already active?", a->meta.id);
 564         else if ((r = manager_add_job(a->meta.manager, JOB_START, UNIT(a->mount), JOB_REPLACE, true, &error, NULL)) < 0) {
 565                 log_warning("%s failed to queue mount startup job: %s", a->meta.id, bus_error(&error, r));
 566                 goto fail;
 567         }
 568
 569         automount_set_state(a, AUTOMOUNT_RUNNING);
 570         return;
 571
 572 fail:
 573         automount_enter_dead(a, false);
 574         dbus_error_free(&error);
 575 }
 576
 577 static int automount_start(Unit *u) {
 578         Automount *a = AUTOMOUNT(u);
 579
 580         assert(a);
 581
 582         assert(a->state == AUTOMOUNT_DEAD || a->state == AUTOMOUNT_MAINTENANCE);
 583
 584         if (path_is_mount_point(a->where)) {
 585                 log_error("Path %s is already a mount point, refusing start for %s", a->where, u->meta.id);
 586                 return -EEXIST;
 587         }
 588
 589         if (a->mount->meta.load_state != UNIT_LOADED)
 590                 return -ENOENT;
 591
 592         a->failure = false;
 593         automount_enter_waiting(a);
 594         return 0;
 595 }
 596
 597 static int automount_stop(Unit *u) {
 598         Automount *a = AUTOMOUNT(u);
 599
 600         assert(a);
 601
 602         assert(a->state == AUTOMOUNT_WAITING || a->state == AUTOMOUNT_RUNNING);
 603
 604         automount_enter_dead(a, true);
 605         return 0;
 606 }
 607
 608 static int automount_serialize(Unit *u, FILE *f, FDSet *fds) {
 609         Automount *a = AUTOMOUNT(u);
 610         void *p;
 611         Iterator i;
 612
 613         assert(a);
 614         assert(f);
 615         assert(fds);
 616
 617         unit_serialize_item(u, f, "state", automount_state_to_string(a->state));
 618         unit_serialize_item(u, f, "failure", yes_no(a->failure));
 619         unit_serialize_item_format(u, f, "dev-id", "%u", (unsigned) a->dev_id);
 620
 621         SET_FOREACH(p, a->tokens, i)
 622                 unit_serialize_item_format(u, f, "token", "%u", PTR_TO_UINT(p));
 623
 624         if (a->pipe_fd >= 0) {
 625                 int copy;
 626
 627                 if ((copy = fdset_put_dup(fds, a->pipe_fd)) < 0)
 628                         return copy;
 629
 630                 unit_serialize_item_format(u, f, "pipe-fd", "%i", copy);
 631         }
 632
 633         return 0;
 634 }
 635
 636 static int automount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 637         Automount *a = AUTOMOUNT(u);
 638         int r;
 639
 640         assert(a);
 641         assert(fds);
 642
 643         if (streq(key, "state")) {
 644                 AutomountState state;
 645
 646                 if ((state = automount_state_from_string(value)) < 0)
 647                         log_debug("Failed to parse state value %s", value);
 648                 else
 649                         a->deserialized_state = state;
 650         } else if (streq(key, "failure")) {
 651                 int b;
 652
 653                 if ((b = parse_boolean(value)) < 0)
 654                         log_debug("Failed to parse failure value %s", value);
 655                 else
 656                         a->failure = b || a->failure;
 657         } else if (streq(key, "dev-id")) {
 658                 unsigned d;
 659
 660                 if (safe_atou(value, &d) < 0)
 661                         log_debug("Failed to parse dev-id value %s", value);
 662                 else
 663                         a->dev_id = (unsigned) d;
 664         } else if (streq(key, "token")) {
 665                 unsigned token;
 666
 667                 if (safe_atou(value, &token) < 0)
 668                         log_debug("Failed to parse token value %s", value);
 669                 else {
 670                         if (!a->tokens)
 671                                 if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func)))
 672                                         return -ENOMEM;
 673
 674                         if ((r = set_put(a->tokens, UINT_TO_PTR(token))) < 0)
 675                                 return r;
 676                 }
 677         } else if (streq(key, "pipe-fd")) {
 678                 int fd;
 679
 680                 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
 681                         log_debug("Failed to parse pipe-fd value %s", value);
 682                 else {
 683                         if (a->pipe_fd >= 0)
 684                                 close_nointr_nofail(a->pipe_fd);
 685
 686                         a->pipe_fd = fdset_remove(fds, fd);
 687                 }
 688         } else
 689                 log_debug("Unknown serialization key '%s'", key);
 690
 691         return 0;
 692 }
 693
 694 static UnitActiveState automount_active_state(Unit *u) {
 695         assert(u);
 696
 697         return state_translation_table[AUTOMOUNT(u)->state];
 698 }
 699
 700 static const char *automount_sub_state_to_string(Unit *u) {
 701         assert(u);
 702
 703         return automount_state_to_string(AUTOMOUNT(u)->state);
 704 }
 705
 706 static bool automount_check_gc(Unit *u) {
 707         Automount *a = AUTOMOUNT(u);
 708
 709         assert(a);
 710
 711         return UNIT_VTABLE(UNIT(a->mount))->check_gc(UNIT(a->mount));
 712 }
 713
 714 static void automount_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 715         Automount *a = AUTOMOUNT(u);
 716         union autofs_v5_packet_union packet;
 717         ssize_t l;
 718         int r;
 719
 720         assert(a);
 721         assert(fd == a->pipe_fd);
 722
 723         if (events != EPOLLIN) {
 724                 log_error("Got invalid poll event on pipe.");
 725                 goto fail;
 726         }
 727
 728         if ((l = loop_read(a->pipe_fd, &packet, sizeof(packet), true)) != sizeof(packet)) {
 729                 log_error("Invalid read from pipe: %s", l < 0 ? strerror(-l) : "short read");
 730                 goto fail;
 731         }
 732
 733         switch (packet.hdr.type) {
 734
 735         case autofs_ptype_missing_direct:
 736                 log_debug("Got direct mount request for %s", packet.v5_packet.name);
 737
 738                 if (!a->tokens)
 739                         if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func))) {
 740                                 log_error("Failed to allocate token set.");
 741                                 goto fail;
 742                         }
 743
 744                 if ((r = set_put(a->tokens, UINT_TO_PTR(packet.v5_packet.wait_queue_token))) < 0) {
 745                         log_error("Failed to remember token: %s", strerror(-r));
 746                         goto fail;
 747                 }
 748
 749                 automount_enter_runnning(a);
 750                 break;
 751
 752         default:
 753                 log_error("Received unknown automount request %i", packet.hdr.type);
 754                 break;
 755         }
 756
 757         return;
 758
 759 fail:
 760         automount_enter_dead(a, false);
 761 }
 762
 763 static void automount_shutdown(Manager *m) {
 764         assert(m);
 765
 766         if (m->dev_autofs_fd >= 0)
 767                 close_nointr_nofail(m->dev_autofs_fd);
 768 }
 769
 770 static const char* const automount_state_table[_AUTOMOUNT_STATE_MAX] = {
 771         [AUTOMOUNT_DEAD] = "dead",
 772         [AUTOMOUNT_WAITING] = "waiting",
 773         [AUTOMOUNT_RUNNING] = "running",
 774         [AUTOMOUNT_MAINTENANCE] = "maintenance"
 775 };
 776
 777 DEFINE_STRING_TABLE_LOOKUP(automount_state, AutomountState);
 778
 779 const UnitVTable automount_vtable = {
 780         .suffix = ".automount",
 781
 782         .no_alias = true,
 783         .no_instances = true,
 784
 785         .init = automount_init,
 786         .load = automount_load,
 787         .done = automount_done,
 788
 789         .coldplug = automount_coldplug,
 790
 791         .dump = automount_dump,
 792
 793         .start = automount_start,
 794         .stop = automount_stop,
 795
 796         .serialize = automount_serialize,
 797         .deserialize_item = automount_deserialize_item,
 798
 799         .active_state = automount_active_state,
 800         .sub_state_to_string = automount_sub_state_to_string,
 801
 802         .check_gc = automount_check_gc,
 803
 804         .fd_event = automount_fd_event,
 805
 806         .bus_message_handler = bus_automount_message_handler,
 807
 808         .shutdown = automount_shutdown
 809 };