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 #include "mkdir.h"
  42
  43 static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = {
  44         [AUTOMOUNT_DEAD] = UNIT_INACTIVE,
  45         [AUTOMOUNT_WAITING] = UNIT_ACTIVE,
  46         [AUTOMOUNT_RUNNING] = UNIT_ACTIVE,
  47         [AUTOMOUNT_FAILED] = UNIT_FAILED
  48 };
  49
  50 static int open_dev_autofs(Manager *m);
  51
  52 static void automount_init(Unit *u) {
  53         Automount *a = AUTOMOUNT(u);
  54
  55         assert(u);
  56         assert(u->load_state == UNIT_STUB);
  57
  58         a->pipe_watch.fd = a->pipe_fd = -1;
  59         a->pipe_watch.type = WATCH_INVALID;
  60
  61         a->directory_mode = 0755;
  62
  63         UNIT(a)->ignore_on_isolate = true;
  64 }
  65
  66 static void repeat_unmout(const char *path) {
  67         assert(path);
  68
  69         for (;;) {
  70                 /* If there are multiple mounts on a mount point, this
  71                  * removes them all */
  72
  73                 if (umount2(path, MNT_DETACH) >= 0)
  74                         continue;
  75
  76                 if (errno != EINVAL)
  77                         log_error("Failed to unmount: %m");
  78
  79                 break;
  80         }
  81 }
  82
  83 static void unmount_autofs(Automount *a) {
  84         assert(a);
  85
  86         if (a->pipe_fd < 0)
  87                 return;
  88
  89         automount_send_ready(a, -EHOSTDOWN);
  90
  91         unit_unwatch_fd(UNIT(a), &a->pipe_watch);
  92         close_nointr_nofail(a->pipe_fd);
  93         a->pipe_fd = -1;
  94
  95         /* If we reload/reexecute things we keep the mount point
  96          * around */
  97         if (a->where &&
  98             (UNIT(a)->manager->exit_code != MANAGER_RELOAD &&
  99              UNIT(a)->manager->exit_code != MANAGER_REEXECUTE))
 100                 repeat_unmout(a->where);
 101 }
 102
 103 static void automount_done(Unit *u) {
 104         Automount *a = AUTOMOUNT(u);
 105
 106         assert(a);
 107
 108         unmount_autofs(a);
 109         unit_ref_unset(&a->mount);
 110
 111         free(a->where);
 112         a->where = NULL;
 113
 114         set_free(a->tokens);
 115         a->tokens = NULL;
 116 }
 117
 118 int automount_add_one_mount_link(Automount *a, Mount *m) {
 119         int r;
 120
 121         assert(a);
 122         assert(m);
 123
 124         if (UNIT(a)->load_state != UNIT_LOADED ||
 125             UNIT(m)->load_state != UNIT_LOADED)
 126                 return 0;
 127
 128         if (!path_startswith(a->where, m->where))
 129                 return 0;
 130
 131         if (path_equal(a->where, m->where))
 132                 return 0;
 133
 134         if ((r = unit_add_two_dependencies(UNIT(a), UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true)) < 0)
 135                 return r;
 136
 137         return 0;
 138 }
 139
 140 static int automount_add_mount_links(Automount *a) {
 141         Unit *other;
 142         int r;
 143
 144         assert(a);
 145
 146         LIST_FOREACH(units_by_type, other, UNIT(a)->manager->units_by_type[UNIT_MOUNT])
 147                 if ((r = automount_add_one_mount_link(a, MOUNT(other))) < 0)
 148                         return r;
 149
 150         return 0;
 151 }
 152
 153 static int automount_add_default_dependencies(Automount *a) {
 154         int r;
 155
 156         assert(a);
 157
 158         if (UNIT(a)->manager->running_as == MANAGER_SYSTEM) {
 159
 160                 if ((r = unit_add_dependency_by_name(UNIT(a), UNIT_BEFORE, SPECIAL_BASIC_TARGET, NULL, true)) < 0)
 161                         return r;
 162
 163                 if ((r = unit_add_two_dependencies_by_name(UNIT(a), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 164                         return r;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static int automount_verify(Automount *a) {
 171         bool b;
 172         char *e;
 173         assert(a);
 174
 175         if (UNIT(a)->load_state != UNIT_LOADED)
 176                 return 0;
 177
 178         if (path_equal(a->where, "/")) {
 179                 log_error("Cannot have an automount unit for the root directory. Refusing.");
 180                 return -EINVAL;
 181         }
 182
 183         if (!(e = unit_name_from_path(a->where, ".automount")))
 184                 return -ENOMEM;
 185
 186         b = unit_has_name(UNIT(a), e);
 187         free(e);
 188
 189         if (!b) {
 190                 log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(a)->id);
 191                 return -EINVAL;
 192         }
 193
 194         return 0;
 195 }
 196
 197 static int automount_load(Unit *u) {
 198         int r;
 199         Automount *a = AUTOMOUNT(u);
 200
 201         assert(u);
 202         assert(u->load_state == UNIT_STUB);
 203
 204         /* Load a .automount file */
 205         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 206                 return r;
 207
 208         if (u->load_state == UNIT_LOADED) {
 209                 Unit *x;
 210
 211                 if (!a->where)
 212                         if (!(a->where = unit_name_to_path(u->id)))
 213                                 return -ENOMEM;
 214
 215                 path_kill_slashes(a->where);
 216
 217                 if ((r = automount_add_mount_links(a)) < 0)
 218                         return r;
 219
 220                 r = unit_load_related_unit(u, ".mount", &x);
 221                 if (r < 0)
 222                         return r;
 223
 224                 unit_ref_set(&a->mount, x);
 225
 226                 r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(a->mount), true);
 227                 if (r < 0)
 228                         return r;
 229
 230                 if (UNIT(a)->default_dependencies)
 231                         if ((r = automount_add_default_dependencies(a)) < 0)
 232                                 return r;
 233         }
 234
 235         return automount_verify(a);
 236 }
 237
 238 static void automount_set_state(Automount *a, AutomountState state) {
 239         AutomountState old_state;
 240         assert(a);
 241
 242         old_state = a->state;
 243         a->state = state;
 244
 245         if (state != AUTOMOUNT_WAITING &&
 246             state != AUTOMOUNT_RUNNING)
 247                 unmount_autofs(a);
 248
 249         if (state != old_state)
 250                 log_debug("%s changed %s -> %s",
 251                           UNIT(a)->id,
 252                           automount_state_to_string(old_state),
 253                           automount_state_to_string(state));
 254
 255         unit_notify(UNIT(a), state_translation_table[old_state], state_translation_table[state], true);
 256 }
 257
 258 static int automount_coldplug(Unit *u) {
 259         Automount *a = AUTOMOUNT(u);
 260         int r;
 261
 262         assert(a);
 263         assert(a->state == AUTOMOUNT_DEAD);
 264
 265         if (a->deserialized_state != a->state) {
 266
 267                 if ((r = open_dev_autofs(u->manager)) < 0)
 268                         return r;
 269
 270                 if (a->deserialized_state == AUTOMOUNT_WAITING ||
 271                     a->deserialized_state == AUTOMOUNT_RUNNING) {
 272
 273                         assert(a->pipe_fd >= 0);
 274
 275                         if ((r = unit_watch_fd(UNIT(a), a->pipe_fd, EPOLLIN, &a->pipe_watch)) < 0)
 276                                 return r;
 277                 }
 278
 279                 automount_set_state(a, a->deserialized_state);
 280         }
 281
 282         return 0;
 283 }
 284
 285 static void automount_dump(Unit *u, FILE *f, const char *prefix) {
 286         Automount *a = AUTOMOUNT(u);
 287
 288         assert(a);
 289
 290         fprintf(f,
 291                 "%sAutomount State: %s\n"
 292                 "%sResult: %s\n"
 293                 "%sWhere: %s\n"
 294                 "%sDirectoryMode: %04o\n",
 295                 prefix, automount_state_to_string(a->state),
 296                 prefix, automount_result_to_string(a->result),
 297                 prefix, a->where,
 298                 prefix, a->directory_mode);
 299 }
 300
 301 static void automount_enter_dead(Automount *a, AutomountResult f) {
 302         assert(a);
 303
 304         if (f != AUTOMOUNT_SUCCESS)
 305                 a->result = f;
 306
 307         automount_set_state(a, a->result != AUTOMOUNT_SUCCESS ? AUTOMOUNT_FAILED : AUTOMOUNT_DEAD);
 308 }
 309
 310 static int open_dev_autofs(Manager *m) {
 311         struct autofs_dev_ioctl param;
 312
 313         assert(m);
 314
 315         if (m->dev_autofs_fd >= 0)
 316                 return m->dev_autofs_fd;
 317
 318         label_fix("/dev/autofs", false);
 319
 320         if ((m->dev_autofs_fd = open("/dev/autofs", O_CLOEXEC|O_RDONLY)) < 0) {
 321                 log_error("Failed to open /dev/autofs: %s", strerror(errno));
 322                 return -errno;
 323         }
 324
 325         init_autofs_dev_ioctl(&param);
 326         if (ioctl(m->dev_autofs_fd, AUTOFS_DEV_IOCTL_VERSION, &param) < 0) {
 327                 close_nointr_nofail(m->dev_autofs_fd);
 328                 m->dev_autofs_fd = -1;
 329                 return -errno;
 330         }
 331
 332         log_debug("Autofs kernel version %i.%i", param.ver_major, param.ver_minor);
 333
 334         return m->dev_autofs_fd;
 335 }
 336
 337 static int open_ioctl_fd(int dev_autofs_fd, const char *where, dev_t devid) {
 338         struct autofs_dev_ioctl *param;
 339         size_t l;
 340         int r;
 341
 342         assert(dev_autofs_fd >= 0);
 343         assert(where);
 344
 345         l = sizeof(struct autofs_dev_ioctl) + strlen(where) + 1;
 346
 347         if (!(param = malloc(l)))
 348                 return -ENOMEM;
 349
 350         init_autofs_dev_ioctl(param);
 351         param->size = l;
 352         param->ioctlfd = -1;
 353         param->openmount.devid = devid;
 354         strcpy(param->path, where);
 355
 356         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_OPENMOUNT, param) < 0) {
 357                 r = -errno;
 358                 goto finish;
 359         }
 360
 361         if (param->ioctlfd < 0) {
 362                 r = -EIO;
 363                 goto finish;
 364         }
 365
 366         fd_cloexec(param->ioctlfd, true);
 367         r = param->ioctlfd;
 368
 369 finish:
 370         free(param);
 371         return r;
 372 }
 373
 374 static int autofs_protocol(int dev_autofs_fd, int ioctl_fd) {
 375         uint32_t major, minor;
 376         struct autofs_dev_ioctl param;
 377
 378         assert(dev_autofs_fd >= 0);
 379         assert(ioctl_fd >= 0);
 380
 381         init_autofs_dev_ioctl(&param);
 382         param.ioctlfd = ioctl_fd;
 383
 384         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOVER, &param) < 0)
 385                 return -errno;
 386
 387         major = param.protover.version;
 388
 389         init_autofs_dev_ioctl(&param);
 390         param.ioctlfd = ioctl_fd;
 391
 392         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_PROTOSUBVER, &param) < 0)
 393                 return -errno;
 394
 395         minor = param.protosubver.sub_version;
 396
 397         log_debug("Autofs protocol version %i.%i", major, minor);
 398         return 0;
 399 }
 400
 401 static int autofs_set_timeout(int dev_autofs_fd, int ioctl_fd, time_t sec) {
 402         struct autofs_dev_ioctl param;
 403
 404         assert(dev_autofs_fd >= 0);
 405         assert(ioctl_fd >= 0);
 406
 407         init_autofs_dev_ioctl(&param);
 408         param.ioctlfd = ioctl_fd;
 409         param.timeout.timeout = sec;
 410
 411         if (ioctl(dev_autofs_fd, AUTOFS_DEV_IOCTL_TIMEOUT, &param) < 0)
 412                 return -errno;
 413
 414         return 0;
 415 }
 416
 417 static int autofs_send_ready(int dev_autofs_fd, int ioctl_fd, uint32_t token, int status) {
 418         struct autofs_dev_ioctl param;
 419
 420         assert(dev_autofs_fd >= 0);
 421         assert(ioctl_fd >= 0);
 422
 423         init_autofs_dev_ioctl(&param);
 424         param.ioctlfd = ioctl_fd;
 425
 426         if (status) {
 427                 param.fail.token = token;
 428                 param.fail.status = status;
 429         } else
 430                 param.ready.token = token;
 431
 432         if (ioctl(dev_autofs_fd, status ? AUTOFS_DEV_IOCTL_FAIL : AUTOFS_DEV_IOCTL_READY, &param) < 0)
 433                 return -errno;
 434
 435         return 0;
 436 }
 437
 438 int automount_send_ready(Automount *a, int status) {
 439         int ioctl_fd, r;
 440         unsigned token;
 441
 442         assert(a);
 443         assert(status <= 0);
 444
 445         if (set_isempty(a->tokens))
 446                 return 0;
 447
 448         if ((ioctl_fd = open_ioctl_fd(UNIT(a)->manager->dev_autofs_fd, a->where, a->dev_id)) < 0) {
 449                 r = ioctl_fd;
 450                 goto fail;
 451         }
 452
 453         if (status)
 454                 log_debug("Sending failure: %s", strerror(-status));
 455         else
 456                 log_debug("Sending success.");
 457
 458         r = 0;
 459
 460         /* Autofs thankfully does not hand out 0 as a token */
 461         while ((token = PTR_TO_UINT(set_steal_first(a->tokens)))) {
 462                 int k;
 463
 464                 /* Autofs fun fact II:
 465                  *
 466                  * if you pass a positive status code here, the kernel will
 467                  * freeze! Yay! */
 468
 469                 if ((k = autofs_send_ready(UNIT(a)->manager->dev_autofs_fd,
 470                                            ioctl_fd,
 471                                            token,
 472                                            status)) < 0)
 473                         r = k;
 474         }
 475
 476 fail:
 477         if (ioctl_fd >= 0)
 478                 close_nointr_nofail(ioctl_fd);
 479
 480         return r;
 481 }
 482
 483 static void automount_enter_waiting(Automount *a) {
 484         int p[2] = { -1, -1 };
 485         char name[32], options[128];
 486         bool mounted = false;
 487         int r, ioctl_fd = -1, dev_autofs_fd;
 488         struct stat st;
 489
 490         assert(a);
 491         assert(a->pipe_fd < 0);
 492         assert(a->where);
 493
 494         if (a->tokens)
 495                 set_clear(a->tokens);
 496
 497         if ((dev_autofs_fd = open_dev_autofs(UNIT(a)->manager)) < 0) {
 498                 r = dev_autofs_fd;
 499                 goto fail;
 500         }
 501
 502         /* We knowingly ignore the results of this call */
 503         mkdir_p(a->where, 0555);
 504
 505         if (pipe2(p, O_NONBLOCK|O_CLOEXEC) < 0) {
 506                 r = -errno;
 507                 goto fail;
 508         }
 509
 510         snprintf(options, sizeof(options), "fd=%i,pgrp=%u,minproto=5,maxproto=5,direct", p[1], (unsigned) getpgrp());
 511         char_array_0(options);
 512
 513         snprintf(name, sizeof(name), "systemd-%u", (unsigned) getpid());
 514         char_array_0(name);
 515
 516         if (mount(name, a->where, "autofs", 0, options) < 0) {
 517                 r = -errno;
 518                 goto fail;
 519         }
 520
 521         mounted = true;
 522
 523         close_nointr_nofail(p[1]);
 524         p[1] = -1;
 525
 526         if (stat(a->where, &st) < 0) {
 527                 r = -errno;
 528                 goto fail;
 529         }
 530
 531         if ((ioctl_fd = open_ioctl_fd(dev_autofs_fd, a->where, st.st_dev)) < 0) {
 532                 r = ioctl_fd;
 533                 goto fail;
 534         }
 535
 536         if ((r = autofs_protocol(dev_autofs_fd, ioctl_fd)) < 0)
 537                 goto fail;
 538
 539         if ((r = autofs_set_timeout(dev_autofs_fd, ioctl_fd, 300)) < 0)
 540                 goto fail;
 541
 542         /* Autofs fun fact:
 543          *
 544          * Unless we close the ioctl fd here, for some weird reason
 545          * the direct mount will not receive events from the
 546          * kernel. */
 547
 548         close_nointr_nofail(ioctl_fd);
 549         ioctl_fd = -1;
 550
 551         if ((r = unit_watch_fd(UNIT(a), p[0], EPOLLIN, &a->pipe_watch)) < 0)
 552                 goto fail;
 553
 554         a->pipe_fd = p[0];
 555         a->dev_id = st.st_dev;
 556
 557         automount_set_state(a, AUTOMOUNT_WAITING);
 558
 559         return;
 560
 561 fail:
 562         assert_se(close_pipe(p) == 0);
 563
 564         if (ioctl_fd >= 0)
 565                 close_nointr_nofail(ioctl_fd);
 566
 567         if (mounted)
 568                 repeat_unmout(a->where);
 569
 570         log_error("Failed to initialize automounter: %s", strerror(-r));
 571         automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES);
 572 }
 573
 574 static void automount_enter_runnning(Automount *a) {
 575         int r;
 576         struct stat st;
 577         DBusError error;
 578
 579         assert(a);
 580         assert(UNIT_DEREF(a->mount));
 581
 582         dbus_error_init(&error);
 583
 584         /* We don't take mount requests anymore if we are supposed to
 585          * shut down anyway */
 586         if (unit_pending_inactive(UNIT(a))) {
 587                 log_debug("Suppressing automount request on %s since unit stop is scheduled.", UNIT(a)->id);
 588                 automount_send_ready(a, -EHOSTDOWN);
 589                 return;
 590         }
 591
 592         mkdir_p(a->where, a->directory_mode);
 593
 594         /* Before we do anything, let's see if somebody is playing games with us? */
 595         if (lstat(a->where, &st) < 0) {
 596                 log_warning("%s failed to stat automount point: %m", UNIT(a)->id);
 597                 goto fail;
 598         }
 599
 600         if (!S_ISDIR(st.st_mode) || st.st_dev != a->dev_id)
 601                 log_info("%s's automount point already active?", UNIT(a)->id);
 602         else if ((r = manager_add_job(UNIT(a)->manager, JOB_START, UNIT_DEREF(a->mount), JOB_REPLACE, true, &error, NULL)) < 0) {
 603                 log_warning("%s failed to queue mount startup job: %s", UNIT(a)->id, bus_error(&error, r));
 604                 goto fail;
 605         }
 606
 607         automount_set_state(a, AUTOMOUNT_RUNNING);
 608         return;
 609
 610 fail:
 611         automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES);
 612         dbus_error_free(&error);
 613 }
 614
 615 static int automount_start(Unit *u) {
 616         Automount *a = AUTOMOUNT(u);
 617
 618         assert(a);
 619
 620         assert(a->state == AUTOMOUNT_DEAD || a->state == AUTOMOUNT_FAILED);
 621
 622         if (path_is_mount_point(a->where, false)) {
 623                 log_error("Path %s is already a mount point, refusing start for %s", a->where, u->id);
 624                 return -EEXIST;
 625         }
 626
 627         if (UNIT_DEREF(a->mount)->load_state != UNIT_LOADED)
 628                 return -ENOENT;
 629
 630         a->result = AUTOMOUNT_SUCCESS;
 631         automount_enter_waiting(a);
 632         return 0;
 633 }
 634
 635 static int automount_stop(Unit *u) {
 636         Automount *a = AUTOMOUNT(u);
 637
 638         assert(a);
 639
 640         assert(a->state == AUTOMOUNT_WAITING || a->state == AUTOMOUNT_RUNNING);
 641
 642         automount_enter_dead(a, AUTOMOUNT_SUCCESS);
 643         return 0;
 644 }
 645
 646 static int automount_serialize(Unit *u, FILE *f, FDSet *fds) {
 647         Automount *a = AUTOMOUNT(u);
 648         void *p;
 649         Iterator i;
 650
 651         assert(a);
 652         assert(f);
 653         assert(fds);
 654
 655         unit_serialize_item(u, f, "state", automount_state_to_string(a->state));
 656         unit_serialize_item(u, f, "result", automount_result_to_string(a->result));
 657         unit_serialize_item_format(u, f, "dev-id", "%u", (unsigned) a->dev_id);
 658
 659         SET_FOREACH(p, a->tokens, i)
 660                 unit_serialize_item_format(u, f, "token", "%u", PTR_TO_UINT(p));
 661
 662         if (a->pipe_fd >= 0) {
 663                 int copy;
 664
 665                 if ((copy = fdset_put_dup(fds, a->pipe_fd)) < 0)
 666                         return copy;
 667
 668                 unit_serialize_item_format(u, f, "pipe-fd", "%i", copy);
 669         }
 670
 671         return 0;
 672 }
 673
 674 static int automount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 675         Automount *a = AUTOMOUNT(u);
 676         int r;
 677
 678         assert(a);
 679         assert(fds);
 680
 681         if (streq(key, "state")) {
 682                 AutomountState state;
 683
 684                 if ((state = automount_state_from_string(value)) < 0)
 685                         log_debug("Failed to parse state value %s", value);
 686                 else
 687                         a->deserialized_state = state;
 688         } else if (streq(key, "result")) {
 689                 AutomountResult f;
 690
 691                 f = automount_result_from_string(value);
 692                 if (f < 0)
 693                         log_debug("Failed to parse result value %s", value);
 694                 else if (f != AUTOMOUNT_SUCCESS)
 695                         a->result = f;
 696
 697         } else if (streq(key, "dev-id")) {
 698                 unsigned d;
 699
 700                 if (safe_atou(value, &d) < 0)
 701                         log_debug("Failed to parse dev-id value %s", value);
 702                 else
 703                         a->dev_id = (unsigned) d;
 704         } else if (streq(key, "token")) {
 705                 unsigned token;
 706
 707                 if (safe_atou(value, &token) < 0)
 708                         log_debug("Failed to parse token value %s", value);
 709                 else {
 710                         if (!a->tokens)
 711                                 if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func)))
 712                                         return -ENOMEM;
 713
 714                         if ((r = set_put(a->tokens, UINT_TO_PTR(token))) < 0)
 715                                 return r;
 716                 }
 717         } else if (streq(key, "pipe-fd")) {
 718                 int fd;
 719
 720                 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
 721                         log_debug("Failed to parse pipe-fd value %s", value);
 722                 else {
 723                         if (a->pipe_fd >= 0)
 724                                 close_nointr_nofail(a->pipe_fd);
 725
 726                         a->pipe_fd = fdset_remove(fds, fd);
 727                 }
 728         } else
 729                 log_debug("Unknown serialization key '%s'", key);
 730
 731         return 0;
 732 }
 733
 734 static UnitActiveState automount_active_state(Unit *u) {
 735         assert(u);
 736
 737         return state_translation_table[AUTOMOUNT(u)->state];
 738 }
 739
 740 static const char *automount_sub_state_to_string(Unit *u) {
 741         assert(u);
 742
 743         return automount_state_to_string(AUTOMOUNT(u)->state);
 744 }
 745
 746 static bool automount_check_gc(Unit *u) {
 747         Automount *a = AUTOMOUNT(u);
 748
 749         assert(a);
 750
 751         if (!UNIT_DEREF(a->mount))
 752                 return false;
 753
 754         return UNIT_VTABLE(UNIT_DEREF(a->mount))->check_gc(UNIT_DEREF(a->mount));
 755 }
 756
 757 static void automount_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 758         Automount *a = AUTOMOUNT(u);
 759         union autofs_v5_packet_union packet;
 760         ssize_t l;
 761         int r;
 762
 763         assert(a);
 764         assert(fd == a->pipe_fd);
 765
 766         if (events != EPOLLIN) {
 767                 log_error("Got invalid poll event on pipe.");
 768                 goto fail;
 769         }
 770
 771         if ((l = loop_read(a->pipe_fd, &packet, sizeof(packet), true)) != sizeof(packet)) {
 772                 log_error("Invalid read from pipe: %s", l < 0 ? strerror(-l) : "short read");
 773                 goto fail;
 774         }
 775
 776         switch (packet.hdr.type) {
 777
 778         case autofs_ptype_missing_direct:
 779
 780                 if (packet.v5_packet.pid > 0) {
 781                         char *p = NULL;
 782
 783                         get_process_comm(packet.v5_packet.pid, &p);
 784                         log_debug("Got direct mount request for %s, triggered by %lu (%s)", packet.v5_packet.name, (unsigned long) packet.v5_packet.pid, strna(p));
 785                         free(p);
 786
 787                 } else
 788                         log_debug("Got direct mount request for %s", packet.v5_packet.name);
 789
 790                 if (!a->tokens)
 791                         if (!(a->tokens = set_new(trivial_hash_func, trivial_compare_func))) {
 792                                 log_error("Failed to allocate token set.");
 793                                 goto fail;
 794                         }
 795
 796                 if ((r = set_put(a->tokens, UINT_TO_PTR(packet.v5_packet.wait_queue_token))) < 0) {
 797                         log_error("Failed to remember token: %s", strerror(-r));
 798                         goto fail;
 799                 }
 800
 801                 automount_enter_runnning(a);
 802                 break;
 803
 804         default:
 805                 log_error("Received unknown automount request %i", packet.hdr.type);
 806                 break;
 807         }
 808
 809         return;
 810
 811 fail:
 812         automount_enter_dead(a, AUTOMOUNT_FAILURE_RESOURCES);
 813 }
 814
 815 static void automount_shutdown(Manager *m) {
 816         assert(m);
 817
 818         if (m->dev_autofs_fd >= 0)
 819                 close_nointr_nofail(m->dev_autofs_fd);
 820 }
 821
 822 static void automount_reset_failed(Unit *u) {
 823         Automount *a = AUTOMOUNT(u);
 824
 825         assert(a);
 826
 827         if (a->state == AUTOMOUNT_FAILED)
 828                 automount_set_state(a, AUTOMOUNT_DEAD);
 829
 830         a->result = AUTOMOUNT_SUCCESS;
 831 }
 832
 833 static const char* const automount_state_table[_AUTOMOUNT_STATE_MAX] = {
 834         [AUTOMOUNT_DEAD] = "dead",
 835         [AUTOMOUNT_WAITING] = "waiting",
 836         [AUTOMOUNT_RUNNING] = "running",
 837         [AUTOMOUNT_FAILED] = "failed"
 838 };
 839
 840 DEFINE_STRING_TABLE_LOOKUP(automount_state, AutomountState);
 841
 842 static const char* const automount_result_table[_AUTOMOUNT_RESULT_MAX] = {
 843         [AUTOMOUNT_SUCCESS] = "success",
 844         [AUTOMOUNT_FAILURE_RESOURCES] = "resources"
 845 };
 846
 847 DEFINE_STRING_TABLE_LOOKUP(automount_result, AutomountResult);
 848
 849 const UnitVTable automount_vtable = {
 850         .suffix = ".automount",
 851         .object_size = sizeof(Automount),
 852         .sections =
 853                 "Unit\0"
 854                 "Automount\0"
 855                 "Install\0",
 856
 857         .no_alias = true,
 858         .no_instances = true,
 859
 860         .init = automount_init,
 861         .load = automount_load,
 862         .done = automount_done,
 863
 864         .coldplug = automount_coldplug,
 865
 866         .dump = automount_dump,
 867
 868         .start = automount_start,
 869         .stop = automount_stop,
 870
 871         .serialize = automount_serialize,
 872         .deserialize_item = automount_deserialize_item,
 873
 874         .active_state = automount_active_state,
 875         .sub_state_to_string = automount_sub_state_to_string,
 876
 877         .check_gc = automount_check_gc,
 878
 879         .fd_event = automount_fd_event,
 880
 881         .reset_failed = automount_reset_failed,
 882
 883         .bus_interface = "org.freedesktop.systemd1.Automount",
 884         .bus_message_handler = bus_automount_message_handler,
 885         .bus_invalidating_properties = bus_automount_invalidating_properties,
 886
 887         .shutdown = automount_shutdown
 888 };