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