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