src/core/mount.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 Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <mntent.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27
  28 #include "manager.h"
  29 #include "unit.h"
  30 #include "mount.h"
  31 #include "load-fragment.h"
  32 #include "load-dropin.h"
  33 #include "log.h"
  34 #include "sd-messages.h"
  35 #include "strv.h"
  36 #include "mkdir.h"
  37 #include "path-util.h"
  38 #include "mount-setup.h"
  39 #include "unit-name.h"
  40 #include "dbus-mount.h"
  41 #include "special.h"
  42 #include "bus-errors.h"
  43 #include "exit-status.h"
  44 #include "def.h"
  45
  46 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  47         [MOUNT_DEAD] = UNIT_INACTIVE,
  48         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  49         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  50         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  51         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  52         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  53         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  54         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  55         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  56         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  57         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  58         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  59         [MOUNT_FAILED] = UNIT_FAILED
  60 };
  61
  62 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
  63 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
  64
  65 static bool mount_is_network(MountParameters *p) {
  66         assert(p);
  67
  68         if (mount_test_option(p->options, "_netdev"))
  69                 return true;
  70
  71         if (p->fstype && fstype_is_network(p->fstype))
  72                 return true;
  73
  74         return false;
  75 }
  76
  77 static bool mount_is_bind(MountParameters *p) {
  78         assert(p);
  79
  80         if (mount_test_option(p->options, "bind"))
  81                 return true;
  82
  83         if (p->fstype && streq(p->fstype, "bind"))
  84                 return true;
  85
  86         if (mount_test_option(p->options, "rbind"))
  87                 return true;
  88
  89         if (p->fstype && streq(p->fstype, "rbind"))
  90                 return true;
  91
  92         return false;
  93 }
  94
  95 static bool mount_is_auto(MountParameters *p) {
  96         assert(p);
  97
  98         return !mount_test_option(p->options, "noauto");
  99 }
 100
 101 static bool needs_quota(MountParameters *p) {
 102         assert(p);
 103
 104         if (mount_is_network(p))
 105                 return false;
 106
 107         if (mount_is_bind(p))
 108                 return false;
 109
 110         return mount_test_option(p->options, "usrquota") ||
 111                 mount_test_option(p->options, "grpquota") ||
 112                 mount_test_option(p->options, "quota") ||
 113                 mount_test_option(p->options, "usrjquota") ||
 114                 mount_test_option(p->options, "grpjquota");
 115 }
 116
 117 static void mount_init(Unit *u) {
 118         Mount *m = MOUNT(u);
 119
 120         assert(u);
 121         assert(u->load_state == UNIT_STUB);
 122
 123         m->timeout_usec = u->manager->default_timeout_start_usec;
 124         m->directory_mode = 0755;
 125
 126         if (unit_has_name(u, "-.mount")) {
 127                 /* Don't allow start/stop for root directory */
 128                 u->refuse_manual_start = true;
 129                 u->refuse_manual_stop = true;
 130         } else {
 131                 /* The stdio/kmsg bridge socket is on /, in order to avoid a
 132                  * dep loop, don't use kmsg logging for -.mount */
 133                 m->exec_context.std_output = u->manager->default_std_output;
 134                 m->exec_context.std_error = u->manager->default_std_error;
 135         }
 136
 137         /* We need to make sure that /bin/mount is always called in
 138          * the same process group as us, so that the autofs kernel
 139          * side doesn't send us another mount request while we are
 140          * already trying to comply its last one. */
 141         m->exec_context.same_pgrp = true;
 142
 143         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 144
 145         u->ignore_on_isolate = true;
 146 }
 147
 148 static int mount_arm_timer(Mount *m) {
 149         int r;
 150
 151         assert(m);
 152
 153         if (m->timeout_usec <= 0) {
 154                 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
 155                 return 0;
 156         }
 157
 158         if (m->timer_event_source) {
 159                 r = sd_event_source_set_time(m->timer_event_source, now(CLOCK_MONOTONIC) + m->timeout_usec);
 160                 if (r < 0)
 161                         return r;
 162
 163                 return sd_event_source_set_enabled(m->timer_event_source, SD_EVENT_ONESHOT);
 164         }
 165
 166         return sd_event_add_time(
 167                         UNIT(m)->manager->event,
 168                         &m->timer_event_source,
 169                         CLOCK_MONOTONIC,
 170                         now(CLOCK_MONOTONIC) + m->timeout_usec, 0,
 171                         mount_dispatch_timer, m);
 172 }
 173
 174 static void mount_unwatch_control_pid(Mount *m) {
 175         assert(m);
 176
 177         if (m->control_pid <= 0)
 178                 return;
 179
 180         unit_unwatch_pid(UNIT(m), m->control_pid);
 181         m->control_pid = 0;
 182 }
 183
 184 static void mount_parameters_done(MountParameters *p) {
 185         assert(p);
 186
 187         free(p->what);
 188         free(p->options);
 189         free(p->fstype);
 190
 191         p->what = p->options = p->fstype = NULL;
 192 }
 193
 194 static void mount_done(Unit *u) {
 195         Mount *m = MOUNT(u);
 196
 197         assert(m);
 198
 199         free(m->where);
 200         m->where = NULL;
 201
 202         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 203         mount_parameters_done(&m->parameters_fragment);
 204
 205         m->exec_runtime = exec_runtime_unref(m->exec_runtime);
 206         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 207         m->control_command = NULL;
 208
 209         mount_unwatch_control_pid(m);
 210
 211         m->timer_event_source = sd_event_source_unref(m->timer_event_source);
 212 }
 213
 214 _pure_ static MountParameters* get_mount_parameters_fragment(Mount *m) {
 215         assert(m);
 216
 217         if (m->from_fragment)
 218                 return &m->parameters_fragment;
 219
 220         return NULL;
 221 }
 222
 223 _pure_ static MountParameters* get_mount_parameters(Mount *m) {
 224         assert(m);
 225
 226         if (m->from_proc_self_mountinfo)
 227                 return &m->parameters_proc_self_mountinfo;
 228
 229         return get_mount_parameters_fragment(m);
 230 }
 231
 232 static int mount_add_mount_links(Mount *m) {
 233         _cleanup_free_ char *parent = NULL;
 234         MountParameters *pm;
 235         Unit *other;
 236         Iterator i;
 237         Set *s;
 238         int r;
 239
 240         assert(m);
 241
 242         if (!path_equal(m->where, "/")) {
 243                 /* Adds in links to other mount points that might lie further
 244                  * up in the hierarchy */
 245                 r = path_get_parent(m->where, &parent);
 246                 if (r < 0)
 247                         return r;
 248
 249                 r = unit_require_mounts_for(UNIT(m), parent);
 250                 if (r < 0)
 251                         return r;
 252         }
 253
 254         /* Adds in links to other mount points that might be needed
 255          * for the source path (if this is a bind mount) to be
 256          * available. */
 257         pm = get_mount_parameters_fragment(m);
 258         if (pm && pm->what &&
 259             path_is_absolute(pm->what) &&
 260             !mount_is_network(pm)) {
 261
 262                 r = unit_require_mounts_for(UNIT(m), pm->what);
 263                 if (r < 0)
 264                         return r;
 265         }
 266
 267         /* Adds in links to other units that use this path or paths
 268          * further down in the hierarchy */
 269         s = manager_get_units_requiring_mounts_for(UNIT(m)->manager, m->where);
 270         SET_FOREACH(other, s, i) {
 271
 272                 if (other->load_state != UNIT_LOADED)
 273                         continue;
 274
 275                 if (other == UNIT(m))
 276                         continue;
 277
 278                 r = unit_add_dependency(other, UNIT_AFTER, UNIT(m), true);
 279                 if (r < 0)
 280                         return r;
 281
 282                 if (UNIT(m)->fragment_path) {
 283                         /* If we have fragment configuration, then make this dependency required */
 284                         r = unit_add_dependency(other, UNIT_REQUIRES, UNIT(m), true);
 285                         if (r < 0)
 286                                 return r;
 287                 }
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int mount_add_device_links(Mount *m) {
 294         MountParameters *p;
 295         bool device_wants_mount = false;
 296         int r;
 297
 298         assert(m);
 299
 300         p = get_mount_parameters_fragment(m);
 301         if (!p)
 302                 return 0;
 303
 304         if (!p->what)
 305                 return 0;
 306
 307         if (mount_is_bind(p))
 308                 return 0;
 309
 310         if (!is_device_path(p->what))
 311                 return 0;
 312
 313         if (path_equal(m->where, "/"))
 314                 return 0;
 315
 316         if (mount_is_auto(p) && UNIT(m)->manager->running_as == SYSTEMD_SYSTEM)
 317                 device_wants_mount = true;
 318
 319         r = unit_add_node_link(UNIT(m), p->what, device_wants_mount);
 320         if (r < 0)
 321                 return r;
 322
 323         return 0;
 324 }
 325
 326 static int mount_add_quota_links(Mount *m) {
 327         int r;
 328         MountParameters *p;
 329
 330         assert(m);
 331
 332         if (UNIT(m)->manager->running_as != SYSTEMD_SYSTEM)
 333                 return 0;
 334
 335         p = get_mount_parameters_fragment(m);
 336         if (!p)
 337                 return 0;
 338
 339         if (!needs_quota(p))
 340                 return 0;
 341
 342         r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true);
 343         if (r < 0)
 344                 return r;
 345
 346         r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true);
 347         if (r < 0)
 348                 return r;
 349
 350         return 0;
 351 }
 352
 353 static bool should_umount(Mount *m) {
 354         MountParameters *p;
 355
 356         if (path_equal(m->where, "/") ||
 357             path_equal(m->where, "/usr"))
 358                 return false;
 359
 360         p = get_mount_parameters(m);
 361         if (p && mount_test_option(p->options, "x-initrd.mount") &&
 362             !in_initrd())
 363                 return false;
 364
 365         return true;
 366 }
 367
 368 static int mount_add_default_dependencies(Mount *m) {
 369         const char *after, *after2, *online;
 370         MountParameters *p;
 371         int r;
 372
 373         assert(m);
 374
 375         if (UNIT(m)->manager->running_as != SYSTEMD_SYSTEM)
 376                 return 0;
 377
 378         p = get_mount_parameters(m);
 379
 380         if (!p)
 381                 return 0;
 382
 383         if (path_equal(m->where, "/"))
 384                 return 0;
 385
 386         if (mount_is_network(p)) {
 387                 after = SPECIAL_REMOTE_FS_PRE_TARGET;
 388                 after2 = SPECIAL_NETWORK_TARGET;
 389                 online = SPECIAL_NETWORK_ONLINE_TARGET;
 390         } else {
 391                 after = SPECIAL_LOCAL_FS_PRE_TARGET;
 392                 after2 = NULL;
 393                 online = NULL;
 394         }
 395
 396         r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true);
 397         if (r < 0)
 398                 return r;
 399
 400         if (after2) {
 401                 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after2, NULL, true);
 402                 if (r < 0)
 403                         return r;
 404         }
 405
 406         if (online) {
 407                 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_WANTS, UNIT_AFTER, online, NULL, true);
 408                 if (r < 0)
 409                         return r;
 410         }
 411
 412         if (should_umount(m)) {
 413                 r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
 414                 if (r < 0)
 415                         return r;
 416         }
 417
 418         return 0;
 419 }
 420
 421 static int mount_fix_timeouts(Mount *m) {
 422         MountParameters *p;
 423         const char *timeout = NULL;
 424         Unit *other;
 425         Iterator i;
 426         usec_t u;
 427         char *t;
 428         int r;
 429
 430         assert(m);
 431
 432         p = get_mount_parameters_fragment(m);
 433         if (!p)
 434                 return 0;
 435
 436         /* Allow configuration how long we wait for a device that
 437          * backs a mount point to show up. This is useful to support
 438          * endless device timeouts for devices that show up only after
 439          * user input, like crypto devices. */
 440
 441         if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
 442                 timeout += 31;
 443         else if ((timeout = mount_test_option(p->options, "x-systemd.device-timeout")))
 444                 timeout += 25;
 445         else
 446                 return 0;
 447
 448         t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
 449         if (!t)
 450                 return -ENOMEM;
 451
 452         r = parse_sec(t, &u);
 453         free(t);
 454
 455         if (r < 0) {
 456                 log_warning_unit(UNIT(m)->id,
 457                                  "Failed to parse timeout for %s, ignoring: %s",
 458                                  m->where, timeout);
 459                 return r;
 460         }
 461
 462         SET_FOREACH(other, UNIT(m)->dependencies[UNIT_AFTER], i) {
 463                 if (other->type != UNIT_DEVICE)
 464                         continue;
 465
 466                 other->job_timeout = u;
 467         }
 468
 469         return 0;
 470 }
 471
 472 static int mount_verify(Mount *m) {
 473         _cleanup_free_ char *e = NULL;
 474         bool b;
 475
 476         assert(m);
 477
 478         if (UNIT(m)->load_state != UNIT_LOADED)
 479                 return 0;
 480
 481         if (!m->from_fragment && !m->from_proc_self_mountinfo)
 482                 return -ENOENT;
 483
 484         e = unit_name_from_path(m->where, ".mount");
 485         if (!e)
 486                 return -ENOMEM;
 487
 488         b = unit_has_name(UNIT(m), e);
 489         if (!b) {
 490                 log_error_unit(UNIT(m)->id, "%s's Where= setting doesn't match unit name. Refusing.", UNIT(m)->id);
 491                 return -EINVAL;
 492         }
 493
 494         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 495                 log_error_unit(UNIT(m)->id, "Cannot create mount unit for API file system %s. Refusing.", m->where);
 496                 return -EINVAL;
 497         }
 498
 499         if (UNIT(m)->fragment_path && !m->parameters_fragment.what) {
 500                 log_error_unit(UNIT(m)->id, "%s's What setting is missing. Refusing.", UNIT(m)->id);
 501                 return -EBADMSG;
 502         }
 503
 504         if (m->exec_context.pam_name && m->kill_context.kill_mode != KILL_CONTROL_GROUP) {
 505                 log_error_unit(UNIT(m)->id, "%s has PAM enabled. Kill mode must be set to control-group'. Refusing.",UNIT(m)->id);
 506                 return -EINVAL;
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int mount_add_extras(Mount *m) {
 513         Unit *u = UNIT(m);
 514         int r;
 515
 516         assert(m);
 517
 518         if (u->fragment_path)
 519                 m->from_fragment = true;
 520
 521         if (!m->where) {
 522                 m->where = unit_name_to_path(u->id);
 523                 if (!m->where)
 524                         return -ENOMEM;
 525         }
 526
 527         path_kill_slashes(m->where);
 528
 529         if (!u->description) {
 530                 r = unit_set_description(u, m->where);
 531                 if (r < 0)
 532                         return r;
 533         }
 534
 535         r = mount_add_device_links(m);
 536         if (r < 0)
 537                 return r;
 538
 539         r = mount_add_mount_links(m);
 540         if (r < 0)
 541                 return r;
 542
 543         r = mount_add_quota_links(m);
 544         if (r < 0)
 545                 return r;
 546
 547         r = unit_patch_contexts(u);
 548         if (r < 0)
 549                 return r;
 550
 551         r = unit_add_exec_dependencies(u, &m->exec_context);
 552         if (r < 0)
 553                 return r;
 554
 555         r = unit_add_default_slice(u, &m->cgroup_context);
 556         if (r < 0)
 557                 return r;
 558
 559         r = mount_fix_timeouts(m);
 560         if (r < 0)
 561                 return r;
 562
 563         if (u->default_dependencies) {
 564                 r = mount_add_default_dependencies(m);
 565                 if (r < 0)
 566                         return r;
 567         }
 568
 569         return 0;
 570 }
 571
 572 static int mount_load(Unit *u) {
 573         Mount *m = MOUNT(u);
 574         int r;
 575
 576         assert(u);
 577         assert(u->load_state == UNIT_STUB);
 578
 579         if (m->from_proc_self_mountinfo)
 580                 r = unit_load_fragment_and_dropin_optional(u);
 581         else
 582                 r = unit_load_fragment_and_dropin(u);
 583
 584         if (r < 0)
 585                 return r;
 586
 587         /* This is a new unit? Then let's add in some extras */
 588         if (u->load_state == UNIT_LOADED) {
 589                 r = mount_add_extras(m);
 590                 if (r < 0)
 591                         return r;
 592         }
 593
 594         return mount_verify(m);
 595 }
 596
 597 static int mount_notify_automount(Mount *m, int status) {
 598         Unit *p;
 599         int r;
 600         Iterator i;
 601
 602         assert(m);
 603
 604         SET_FOREACH(p, UNIT(m)->dependencies[UNIT_TRIGGERED_BY], i)
 605                 if (p->type == UNIT_AUTOMOUNT) {
 606                          r = automount_send_ready(AUTOMOUNT(p), status);
 607                          if (r < 0)
 608                                  return r;
 609                 }
 610
 611         return 0;
 612 }
 613
 614 static void mount_set_state(Mount *m, MountState state) {
 615         MountState old_state;
 616         assert(m);
 617
 618         old_state = m->state;
 619         m->state = state;
 620
 621         if (state != MOUNT_MOUNTING &&
 622             state != MOUNT_MOUNTING_DONE &&
 623             state != MOUNT_REMOUNTING &&
 624             state != MOUNT_UNMOUNTING &&
 625             state != MOUNT_MOUNTING_SIGTERM &&
 626             state != MOUNT_MOUNTING_SIGKILL &&
 627             state != MOUNT_UNMOUNTING_SIGTERM &&
 628             state != MOUNT_UNMOUNTING_SIGKILL &&
 629             state != MOUNT_REMOUNTING_SIGTERM &&
 630             state != MOUNT_REMOUNTING_SIGKILL) {
 631                 m->timer_event_source = sd_event_source_unref(m->timer_event_source);
 632                 mount_unwatch_control_pid(m);
 633                 m->control_command = NULL;
 634                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 635         }
 636
 637         if (state == MOUNT_MOUNTED ||
 638             state == MOUNT_REMOUNTING)
 639                 mount_notify_automount(m, 0);
 640         else if (state == MOUNT_DEAD ||
 641                  state == MOUNT_UNMOUNTING ||
 642                  state == MOUNT_MOUNTING_SIGTERM ||
 643                  state == MOUNT_MOUNTING_SIGKILL ||
 644                  state == MOUNT_REMOUNTING_SIGTERM ||
 645                  state == MOUNT_REMOUNTING_SIGKILL ||
 646                  state == MOUNT_UNMOUNTING_SIGTERM ||
 647                  state == MOUNT_UNMOUNTING_SIGKILL ||
 648                  state == MOUNT_FAILED) {
 649                 if (state != old_state)
 650                         mount_notify_automount(m, -ENODEV);
 651         }
 652
 653         if (state != old_state)
 654                 log_debug_unit(UNIT(m)->id,
 655                                "%s changed %s -> %s",
 656                                UNIT(m)->id,
 657                                mount_state_to_string(old_state),
 658                                mount_state_to_string(state));
 659
 660         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], m->reload_result == MOUNT_SUCCESS);
 661         m->reload_result = MOUNT_SUCCESS;
 662 }
 663
 664 static int mount_coldplug(Unit *u) {
 665         Mount *m = MOUNT(u);
 666         MountState new_state = MOUNT_DEAD;
 667         int r;
 668
 669         assert(m);
 670         assert(m->state == MOUNT_DEAD);
 671
 672         if (m->deserialized_state != m->state)
 673                 new_state = m->deserialized_state;
 674         else if (m->from_proc_self_mountinfo)
 675                 new_state = MOUNT_MOUNTED;
 676
 677         if (new_state == m->state)
 678                 return 0;
 679
 680         if (new_state == MOUNT_MOUNTING ||
 681             new_state == MOUNT_MOUNTING_DONE ||
 682             new_state == MOUNT_REMOUNTING ||
 683             new_state == MOUNT_UNMOUNTING ||
 684             new_state == MOUNT_MOUNTING_SIGTERM ||
 685             new_state == MOUNT_MOUNTING_SIGKILL ||
 686             new_state == MOUNT_UNMOUNTING_SIGTERM ||
 687             new_state == MOUNT_UNMOUNTING_SIGKILL ||
 688             new_state == MOUNT_REMOUNTING_SIGTERM ||
 689             new_state == MOUNT_REMOUNTING_SIGKILL) {
 690
 691                 if (m->control_pid <= 0)
 692                         return -EBADMSG;
 693
 694                 r = unit_watch_pid(UNIT(m), m->control_pid);
 695                 if (r < 0)
 696                         return r;
 697
 698                 r = mount_arm_timer(m);
 699                 if (r < 0)
 700                         return r;
 701         }
 702
 703         mount_set_state(m, new_state);
 704         return 0;
 705 }
 706
 707 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 708         Mount *m = MOUNT(u);
 709         MountParameters *p;
 710
 711         assert(m);
 712         assert(f);
 713
 714         p = get_mount_parameters(m);
 715
 716         fprintf(f,
 717                 "%sMount State: %s\n"
 718                 "%sResult: %s\n"
 719                 "%sWhere: %s\n"
 720                 "%sWhat: %s\n"
 721                 "%sFile System Type: %s\n"
 722                 "%sOptions: %s\n"
 723                 "%sFrom /proc/self/mountinfo: %s\n"
 724                 "%sFrom fragment: %s\n"
 725                 "%sDirectoryMode: %04o\n",
 726                 prefix, mount_state_to_string(m->state),
 727                 prefix, mount_result_to_string(m->result),
 728                 prefix, m->where,
 729                 prefix, p ? strna(p->what) : "n/a",
 730                 prefix, p ? strna(p->fstype) : "n/a",
 731                 prefix, p ? strna(p->options) : "n/a",
 732                 prefix, yes_no(m->from_proc_self_mountinfo),
 733                 prefix, yes_no(m->from_fragment),
 734                 prefix, m->directory_mode);
 735
 736         if (m->control_pid > 0)
 737                 fprintf(f,
 738                         "%sControl PID: "PID_FMT"\n",
 739                         prefix, m->control_pid);
 740
 741         exec_context_dump(&m->exec_context, f, prefix);
 742         kill_context_dump(&m->kill_context, f, prefix);
 743 }
 744
 745 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 746         pid_t pid;
 747         int r;
 748
 749         assert(m);
 750         assert(c);
 751         assert(_pid);
 752
 753         unit_realize_cgroup(UNIT(m));
 754
 755         r = unit_setup_exec_runtime(UNIT(m));
 756         if (r < 0)
 757                 goto fail;
 758
 759         r = mount_arm_timer(m);
 760         if (r < 0)
 761                 goto fail;
 762
 763         r = exec_spawn(c,
 764                        NULL,
 765                        &m->exec_context,
 766                        NULL, 0,
 767                        UNIT(m)->manager->environment,
 768                        true,
 769                        true,
 770                        true,
 771                        UNIT(m)->manager->confirm_spawn,
 772                        UNIT(m)->manager->cgroup_supported,
 773                        UNIT(m)->cgroup_path,
 774                        manager_get_runtime_prefix(UNIT(m)->manager),
 775                        UNIT(m)->id,
 776                        0,
 777                        NULL,
 778                        m->exec_runtime,
 779                        &pid);
 780         if (r < 0)
 781                 goto fail;
 782
 783         r = unit_watch_pid(UNIT(m), pid);
 784         if (r < 0)
 785                 /* FIXME: we need to do something here */
 786                 goto fail;
 787
 788         *_pid = pid;
 789
 790         return 0;
 791
 792 fail:
 793         m->timer_event_source = sd_event_source_unref(m->timer_event_source);
 794
 795         return r;
 796 }
 797
 798 static void mount_enter_dead(Mount *m, MountResult f) {
 799         assert(m);
 800
 801         if (f != MOUNT_SUCCESS)
 802                 m->result = f;
 803
 804         exec_runtime_destroy(m->exec_runtime);
 805         m->exec_runtime = exec_runtime_unref(m->exec_runtime);
 806
 807         exec_context_destroy_runtime_directory(&m->exec_context, manager_get_runtime_prefix(UNIT(m)->manager));
 808
 809         mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
 810 }
 811
 812 static void mount_enter_mounted(Mount *m, MountResult f) {
 813         assert(m);
 814
 815         if (f != MOUNT_SUCCESS)
 816                 m->result = f;
 817
 818         mount_set_state(m, MOUNT_MOUNTED);
 819 }
 820
 821 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
 822         int r;
 823
 824         assert(m);
 825
 826         if (f != MOUNT_SUCCESS)
 827                 m->result = f;
 828
 829         r = unit_kill_context(
 830                         UNIT(m),
 831                         &m->kill_context,
 832                         state != MOUNT_MOUNTING_SIGTERM && state != MOUNT_UNMOUNTING_SIGTERM && state != MOUNT_REMOUNTING_SIGTERM,
 833                         -1,
 834                         m->control_pid,
 835                         false);
 836         if (r < 0)
 837                 goto fail;
 838
 839         if (r > 0) {
 840                 r = mount_arm_timer(m);
 841                 if (r < 0)
 842                         goto fail;
 843
 844                 mount_set_state(m, state);
 845         } else if (state == MOUNT_REMOUNTING_SIGTERM)
 846                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_SUCCESS);
 847         else if (state == MOUNT_REMOUNTING_SIGKILL)
 848                 mount_enter_mounted(m, MOUNT_SUCCESS);
 849         else if (state == MOUNT_MOUNTING_SIGTERM)
 850                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_SUCCESS);
 851         else if (state == MOUNT_UNMOUNTING_SIGTERM)
 852                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_SUCCESS);
 853         else
 854                 mount_enter_dead(m, MOUNT_SUCCESS);
 855
 856         return;
 857
 858 fail:
 859         log_warning_unit(UNIT(m)->id,
 860                          "%s failed to kill processes: %s", UNIT(m)->id, strerror(-r));
 861
 862         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 863                 mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
 864         else
 865                 mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
 866 }
 867
 868 void warn_if_dir_nonempty(const char *unit, const char* where) {
 869         assert(unit);
 870         assert(where);
 871
 872         if (dir_is_empty(where) > 0)
 873                 return;
 874
 875         log_struct_unit(LOG_NOTICE,
 876                    unit,
 877                    "MESSAGE=%s: Directory %s to mount over is not empty, mounting anyway.",
 878                    unit, where,
 879                    "WHERE=%s", where,
 880                    MESSAGE_ID(SD_MESSAGE_OVERMOUNTING),
 881                    NULL);
 882 }
 883
 884 static void mount_enter_unmounting(Mount *m) {
 885         int r;
 886
 887         assert(m);
 888
 889         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 890         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 891
 892         if ((r = exec_command_set(
 893                              m->control_command,
 894                              "/bin/umount",
 895                              "-n",
 896                              m->where,
 897                              NULL)) < 0)
 898                 goto fail;
 899
 900         mount_unwatch_control_pid(m);
 901
 902         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 903                 goto fail;
 904
 905         mount_set_state(m, MOUNT_UNMOUNTING);
 906
 907         return;
 908
 909 fail:
 910         log_warning_unit(UNIT(m)->id,
 911                          "%s failed to run 'umount' task: %s",
 912                          UNIT(m)->id, strerror(-r));
 913         mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
 914 }
 915
 916 static void mount_enter_mounting(Mount *m) {
 917         int r;
 918         MountParameters *p;
 919
 920         assert(m);
 921
 922         m->control_command_id = MOUNT_EXEC_MOUNT;
 923         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 924
 925         mkdir_p_label(m->where, m->directory_mode);
 926
 927         warn_if_dir_nonempty(m->meta.id, m->where);
 928
 929         /* Create the source directory for bind-mounts if needed */
 930         p = get_mount_parameters_fragment(m);
 931         if (p && mount_is_bind(p))
 932                 mkdir_p_label(p->what, m->directory_mode);
 933
 934         if (m->from_fragment)
 935                 r = exec_command_set(
 936                                 m->control_command,
 937                                 "/bin/mount",
 938                                 m->sloppy_options ? "-ns" : "-n",
 939                                 m->parameters_fragment.what,
 940                                 m->where,
 941                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 942                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 943                                 NULL);
 944         else
 945                 r = -ENOENT;
 946
 947         if (r < 0)
 948                 goto fail;
 949
 950         mount_unwatch_control_pid(m);
 951
 952         r = mount_spawn(m, m->control_command, &m->control_pid);
 953         if (r < 0)
 954                 goto fail;
 955
 956         mount_set_state(m, MOUNT_MOUNTING);
 957
 958         return;
 959
 960 fail:
 961         log_warning_unit(UNIT(m)->id,
 962                          "%s failed to run 'mount' task: %s",
 963                          UNIT(m)->id, strerror(-r));
 964         mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
 965 }
 966
 967 static void mount_enter_remounting(Mount *m) {
 968         int r;
 969
 970         assert(m);
 971
 972         m->control_command_id = MOUNT_EXEC_REMOUNT;
 973         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 974
 975         if (m->from_fragment) {
 976                 const char *o;
 977
 978                 if (m->parameters_fragment.options)
 979                         o = strappenda("remount,", m->parameters_fragment.options);
 980                 else
 981                         o = "remount";
 982
 983                 r = exec_command_set(
 984                                 m->control_command,
 985                                 "/bin/mount",
 986                                 m->sloppy_options ? "-ns" : "-n",
 987                                 m->parameters_fragment.what,
 988                                 m->where,
 989                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 990                                 "-o", o,
 991                                 NULL);
 992         } else
 993                 r = -ENOENT;
 994
 995         if (r < 0)
 996                 goto fail;
 997
 998         mount_unwatch_control_pid(m);
 999
1000         r = mount_spawn(m, m->control_command, &m->control_pid);
1001         if (r < 0)
1002                 goto fail;
1003
1004         mount_set_state(m, MOUNT_REMOUNTING);
1005
1006         return;
1007
1008 fail:
1009         log_warning_unit(UNIT(m)->id,
1010                          "%s failed to run 'remount' task: %s",
1011                          UNIT(m)->id, strerror(-r));
1012         m->reload_result = MOUNT_FAILURE_RESOURCES;
1013         mount_enter_mounted(m, MOUNT_SUCCESS);
1014 }
1015
1016 static int mount_start(Unit *u) {
1017         Mount *m = MOUNT(u);
1018
1019         assert(m);
1020
1021         /* We cannot fulfill this request right now, try again later
1022          * please! */
1023         if (m->state == MOUNT_UNMOUNTING ||
1024             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1025             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1026             m->state == MOUNT_MOUNTING_SIGTERM ||
1027             m->state == MOUNT_MOUNTING_SIGKILL)
1028                 return -EAGAIN;
1029
1030         /* Already on it! */
1031         if (m->state == MOUNT_MOUNTING)
1032                 return 0;
1033
1034         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1035
1036         m->result = MOUNT_SUCCESS;
1037         m->reload_result = MOUNT_SUCCESS;
1038
1039         mount_enter_mounting(m);
1040         return 0;
1041 }
1042
1043 static int mount_stop(Unit *u) {
1044         Mount *m = MOUNT(u);
1045
1046         assert(m);
1047
1048         /* Already on it */
1049         if (m->state == MOUNT_UNMOUNTING ||
1050             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1051             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1052             m->state == MOUNT_MOUNTING_SIGTERM ||
1053             m->state == MOUNT_MOUNTING_SIGKILL)
1054                 return 0;
1055
1056         assert(m->state == MOUNT_MOUNTING ||
1057                m->state == MOUNT_MOUNTING_DONE ||
1058                m->state == MOUNT_MOUNTED ||
1059                m->state == MOUNT_REMOUNTING ||
1060                m->state == MOUNT_REMOUNTING_SIGTERM ||
1061                m->state == MOUNT_REMOUNTING_SIGKILL);
1062
1063         mount_enter_unmounting(m);
1064         return 0;
1065 }
1066
1067 static int mount_reload(Unit *u) {
1068         Mount *m = MOUNT(u);
1069
1070         assert(m);
1071
1072         if (m->state == MOUNT_MOUNTING_DONE)
1073                 return -EAGAIN;
1074
1075         assert(m->state == MOUNT_MOUNTED);
1076
1077         mount_enter_remounting(m);
1078         return 0;
1079 }
1080
1081 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1082         Mount *m = MOUNT(u);
1083
1084         assert(m);
1085         assert(f);
1086         assert(fds);
1087
1088         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1089         unit_serialize_item(u, f, "result", mount_result_to_string(m->result));
1090         unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
1091
1092         if (m->control_pid > 0)
1093                 unit_serialize_item_format(u, f, "control-pid", PID_FMT, m->control_pid);
1094
1095         if (m->control_command_id >= 0)
1096                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1097
1098         return 0;
1099 }
1100
1101 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1102         Mount *m = MOUNT(u);
1103
1104         assert(u);
1105         assert(key);
1106         assert(value);
1107         assert(fds);
1108
1109         if (streq(key, "state")) {
1110                 MountState state;
1111
1112                 if ((state = mount_state_from_string(value)) < 0)
1113                         log_debug_unit(u->id, "Failed to parse state value %s", value);
1114                 else
1115                         m->deserialized_state = state;
1116         } else if (streq(key, "result")) {
1117                 MountResult f;
1118
1119                 f = mount_result_from_string(value);
1120                 if (f < 0)
1121                         log_debug_unit(UNIT(m)->id,
1122                                        "Failed to parse result value %s", value);
1123                 else if (f != MOUNT_SUCCESS)
1124                         m->result = f;
1125
1126         } else if (streq(key, "reload-result")) {
1127                 MountResult f;
1128
1129                 f = mount_result_from_string(value);
1130                 if (f < 0)
1131                         log_debug_unit(UNIT(m)->id,
1132                                        "Failed to parse reload result value %s", value);
1133                 else if (f != MOUNT_SUCCESS)
1134                         m->reload_result = f;
1135
1136         } else if (streq(key, "control-pid")) {
1137                 pid_t pid;
1138
1139                 if (parse_pid(value, &pid) < 0)
1140                         log_debug_unit(UNIT(m)->id,
1141                                        "Failed to parse control-pid value %s", value);
1142                 else
1143                         m->control_pid = pid;
1144         } else if (streq(key, "control-command")) {
1145                 MountExecCommand id;
1146
1147                 if ((id = mount_exec_command_from_string(value)) < 0)
1148                         log_debug_unit(UNIT(m)->id,
1149                                        "Failed to parse exec-command value %s", value);
1150                 else {
1151                         m->control_command_id = id;
1152                         m->control_command = m->exec_command + id;
1153                 }
1154         } else
1155                 log_debug_unit(UNIT(m)->id,
1156                                "Unknown serialization key '%s'", key);
1157
1158         return 0;
1159 }
1160
1161 _pure_ static UnitActiveState mount_active_state(Unit *u) {
1162         assert(u);
1163
1164         return state_translation_table[MOUNT(u)->state];
1165 }
1166
1167 _pure_ static const char *mount_sub_state_to_string(Unit *u) {
1168         assert(u);
1169
1170         return mount_state_to_string(MOUNT(u)->state);
1171 }
1172
1173 _pure_ static bool mount_check_gc(Unit *u) {
1174         Mount *m = MOUNT(u);
1175
1176         assert(m);
1177
1178         return m->from_proc_self_mountinfo;
1179 }
1180
1181 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1182         Mount *m = MOUNT(u);
1183         MountResult f;
1184
1185         assert(m);
1186         assert(pid >= 0);
1187
1188         if (pid != m->control_pid)
1189                 return;
1190
1191         m->control_pid = 0;
1192
1193         if (is_clean_exit(code, status, NULL))
1194                 f = MOUNT_SUCCESS;
1195         else if (code == CLD_EXITED)
1196                 f = MOUNT_FAILURE_EXIT_CODE;
1197         else if (code == CLD_KILLED)
1198                 f = MOUNT_FAILURE_SIGNAL;
1199         else if (code == CLD_DUMPED)
1200                 f = MOUNT_FAILURE_CORE_DUMP;
1201         else
1202                 assert_not_reached("Unknown code");
1203
1204         if (f != MOUNT_SUCCESS)
1205                 m->result = f;
1206
1207         if (m->control_command) {
1208                 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1209
1210                 m->control_command = NULL;
1211                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1212         }
1213
1214         log_full_unit(f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE, u->id,
1215                       "%s mount process exited, code=%s status=%i",
1216                       u->id, sigchld_code_to_string(code), status);
1217
1218         /* Note that mount(8) returning and the kernel sending us a
1219          * mount table change event might happen out-of-order. If an
1220          * operation succeed we assume the kernel will follow soon too
1221          * and already change into the resulting state.  If it fails
1222          * we check if the kernel still knows about the mount. and
1223          * change state accordingly. */
1224
1225         switch (m->state) {
1226
1227         case MOUNT_MOUNTING:
1228         case MOUNT_MOUNTING_DONE:
1229         case MOUNT_MOUNTING_SIGKILL:
1230         case MOUNT_MOUNTING_SIGTERM:
1231
1232                 if (f == MOUNT_SUCCESS)
1233                         mount_enter_mounted(m, f);
1234                 else if (m->from_proc_self_mountinfo)
1235                         mount_enter_mounted(m, f);
1236                 else
1237                         mount_enter_dead(m, f);
1238                 break;
1239
1240         case MOUNT_REMOUNTING:
1241         case MOUNT_REMOUNTING_SIGKILL:
1242         case MOUNT_REMOUNTING_SIGTERM:
1243
1244                 m->reload_result = f;
1245                 if (m->from_proc_self_mountinfo)
1246                         mount_enter_mounted(m, MOUNT_SUCCESS);
1247                 else
1248                         mount_enter_dead(m, MOUNT_SUCCESS);
1249
1250                 break;
1251
1252         case MOUNT_UNMOUNTING:
1253         case MOUNT_UNMOUNTING_SIGKILL:
1254         case MOUNT_UNMOUNTING_SIGTERM:
1255
1256                 if (f == MOUNT_SUCCESS)
1257                         mount_enter_dead(m, f);
1258                 else if (m->from_proc_self_mountinfo)
1259                         mount_enter_mounted(m, f);
1260                 else
1261                         mount_enter_dead(m, f);
1262                 break;
1263
1264         default:
1265                 assert_not_reached("Uh, control process died at wrong time.");
1266         }
1267
1268         /* Notify clients about changed exit status */
1269         unit_add_to_dbus_queue(u);
1270 }
1271
1272 static int mount_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
1273         Mount *m = MOUNT(userdata);
1274
1275         assert(m);
1276         assert(m->timer_event_source == source);
1277
1278         switch (m->state) {
1279
1280         case MOUNT_MOUNTING:
1281         case MOUNT_MOUNTING_DONE:
1282                 log_warning_unit(UNIT(m)->id,
1283                                  "%s mounting timed out. Stopping.", UNIT(m)->id);
1284                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1285                 break;
1286
1287         case MOUNT_REMOUNTING:
1288                 log_warning_unit(UNIT(m)->id,
1289                                  "%s remounting timed out. Stopping.", UNIT(m)->id);
1290                 m->reload_result = MOUNT_FAILURE_TIMEOUT;
1291                 mount_enter_mounted(m, MOUNT_SUCCESS);
1292                 break;
1293
1294         case MOUNT_UNMOUNTING:
1295                 log_warning_unit(UNIT(m)->id,
1296                                  "%s unmounting timed out. Stopping.", UNIT(m)->id);
1297                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1298                 break;
1299
1300         case MOUNT_MOUNTING_SIGTERM:
1301                 if (m->kill_context.send_sigkill) {
1302                         log_warning_unit(UNIT(m)->id,
1303                                          "%s mounting timed out. Killing.", UNIT(m)->id);
1304                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1305                 } else {
1306                         log_warning_unit(UNIT(m)->id,
1307                                          "%s mounting timed out. Skipping SIGKILL. Ignoring.",
1308                                          UNIT(m)->id);
1309
1310                         if (m->from_proc_self_mountinfo)
1311                                 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1312                         else
1313                                 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1314                 }
1315                 break;
1316
1317         case MOUNT_REMOUNTING_SIGTERM:
1318                 if (m->kill_context.send_sigkill) {
1319                         log_warning_unit(UNIT(m)->id,
1320                                          "%s remounting timed out. Killing.", UNIT(m)->id);
1321                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1322                 } else {
1323                         log_warning_unit(UNIT(m)->id,
1324                                          "%s remounting timed out. Skipping SIGKILL. Ignoring.",
1325                                          UNIT(m)->id);
1326
1327                         if (m->from_proc_self_mountinfo)
1328                                 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1329                         else
1330                                 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1331                 }
1332                 break;
1333
1334         case MOUNT_UNMOUNTING_SIGTERM:
1335                 if (m->kill_context.send_sigkill) {
1336                         log_warning_unit(UNIT(m)->id,
1337                                          "%s unmounting timed out. Killing.", UNIT(m)->id);
1338                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1339                 } else {
1340                         log_warning_unit(UNIT(m)->id,
1341                                          "%s unmounting timed out. Skipping SIGKILL. Ignoring.",
1342                                          UNIT(m)->id);
1343
1344                         if (m->from_proc_self_mountinfo)
1345                                 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1346                         else
1347                                 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1348                 }
1349                 break;
1350
1351         case MOUNT_MOUNTING_SIGKILL:
1352         case MOUNT_REMOUNTING_SIGKILL:
1353         case MOUNT_UNMOUNTING_SIGKILL:
1354                 log_warning_unit(UNIT(m)->id,
1355                                  "%s mount process still around after SIGKILL. Ignoring.",
1356                                  UNIT(m)->id);
1357
1358                 if (m->from_proc_self_mountinfo)
1359                         mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1360                 else
1361                         mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1362                 break;
1363
1364         default:
1365                 assert_not_reached("Timeout at wrong time.");
1366         }
1367
1368         return 0;
1369 }
1370
1371 static int mount_add_one(
1372                 Manager *m,
1373                 const char *what,
1374                 const char *where,
1375                 const char *options,
1376                 const char *fstype,
1377                 bool set_flags) {
1378
1379         _cleanup_free_ char *e = NULL, *w = NULL, *o = NULL, *f = NULL;
1380         bool load_extras = false;
1381         MountParameters *p;
1382         bool delete, changed = false;
1383         Unit *u;
1384         int r;
1385
1386         assert(m);
1387         assert(what);
1388         assert(where);
1389         assert(options);
1390         assert(fstype);
1391
1392         /* Ignore API mount points. They should never be referenced in
1393          * dependencies ever. */
1394         if (mount_point_is_api(where) || mount_point_ignore(where))
1395                 return 0;
1396
1397         if (streq(fstype, "autofs"))
1398                 return 0;
1399
1400         /* probably some kind of swap, ignore */
1401         if (!is_path(where))
1402                 return 0;
1403
1404         e = unit_name_from_path(where, ".mount");
1405         if (!e)
1406                 return -ENOMEM;
1407
1408         u = manager_get_unit(m, e);
1409         if (!u) {
1410                 delete = true;
1411
1412                 u = unit_new(m, sizeof(Mount));
1413                 if (!u)
1414                         return -ENOMEM;
1415
1416                 r = unit_add_name(u, e);
1417                 if (r < 0)
1418                         goto fail;
1419
1420                 MOUNT(u)->where = strdup(where);
1421                 if (!MOUNT(u)->where) {
1422                         r = -ENOMEM;
1423                         goto fail;
1424                 }
1425
1426                 u->source_path = strdup("/proc/self/mountinfo");
1427                 if (!u->source_path) {
1428                         r = -ENOMEM;
1429                         goto fail;
1430                 }
1431
1432
1433                 if (m->running_as == SYSTEMD_SYSTEM) {
1434                         const char* target;
1435
1436                         target = fstype_is_network(fstype) ? SPECIAL_REMOTE_FS_TARGET : SPECIAL_LOCAL_FS_TARGET;
1437
1438                         r = unit_add_dependency_by_name(u, UNIT_BEFORE, target, NULL, true);
1439                         if (r < 0)
1440                                 goto fail;
1441
1442                         if (should_umount(MOUNT(u))) {
1443                                 r = unit_add_dependency_by_name(u, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true);
1444                                 if (r < 0)
1445                                         goto fail;
1446                         }
1447                 }
1448
1449                 unit_add_to_load_queue(u);
1450                 changed = true;
1451         } else {
1452                 delete = false;
1453
1454                 if (!MOUNT(u)->where) {
1455                         MOUNT(u)->where = strdup(where);
1456                         if (!MOUNT(u)->where) {
1457                                 r = -ENOMEM;
1458                                 goto fail;
1459                         }
1460                 }
1461
1462                 if (u->load_state == UNIT_NOT_FOUND) {
1463                         u->load_state = UNIT_LOADED;
1464                         u->load_error = 0;
1465
1466                         /* Load in the extras later on, after we
1467                          * finished initialization of the unit */
1468                         load_extras = true;
1469                         changed = true;
1470                 }
1471         }
1472
1473         w = strdup(what);
1474         o = strdup(options);
1475         f = strdup(fstype);
1476         if (!w || !o || !f) {
1477                 r = -ENOMEM;
1478                 goto fail;
1479         }
1480
1481         p = &MOUNT(u)->parameters_proc_self_mountinfo;
1482
1483         changed = changed ||
1484                 !streq_ptr(p->options, options) ||
1485                 !streq_ptr(p->what, what) ||
1486                 !streq_ptr(p->fstype, fstype);
1487
1488         if (set_flags) {
1489                 MOUNT(u)->is_mounted = true;
1490                 MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1491                 MOUNT(u)->just_changed = changed;
1492         }
1493
1494         MOUNT(u)->from_proc_self_mountinfo = true;
1495
1496         free(p->what);
1497         p->what = w;
1498         w = NULL;
1499
1500         free(p->options);
1501         p->options = o;
1502         o = NULL;
1503
1504         free(p->fstype);
1505         p->fstype = f;
1506         f = NULL;
1507
1508         if (load_extras) {
1509                 r = mount_add_extras(MOUNT(u));
1510                 if (r < 0)
1511                         goto fail;
1512         }
1513
1514         if (changed)
1515                 unit_add_to_dbus_queue(u);
1516
1517         return 0;
1518
1519 fail:
1520         if (delete && u)
1521                 unit_free(u);
1522
1523         return r;
1524 }
1525
1526 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1527         int r = 0;
1528         unsigned i;
1529
1530         assert(m);
1531
1532         rewind(m->proc_self_mountinfo);
1533
1534         for (i = 1;; i++) {
1535                 _cleanup_free_ char *device = NULL, *path = NULL, *options = NULL, *options2 = NULL, *fstype = NULL, *d = NULL, *p = NULL, *o = NULL;
1536                 int k;
1537
1538                 k = fscanf(m->proc_self_mountinfo,
1539                            "%*s "       /* (1) mount id */
1540                            "%*s "       /* (2) parent id */
1541                            "%*s "       /* (3) major:minor */
1542                            "%*s "       /* (4) root */
1543                            "%ms "       /* (5) mount point */
1544                            "%ms"        /* (6) mount options */
1545                            "%*[^-]"     /* (7) optional fields */
1546                            "- "         /* (8) separator */
1547                            "%ms "       /* (9) file system type */
1548                            "%ms"        /* (10) mount source */
1549                            "%ms"        /* (11) mount options 2 */
1550                            "%*[^\n]",   /* some rubbish at the end */
1551                            &path,
1552                            &options,
1553                            &fstype,
1554                            &device,
1555                            &options2);
1556
1557                 if (k == EOF)
1558                         break;
1559
1560                 if (k != 5) {
1561                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1562                         continue;
1563                 }
1564
1565                 o = strjoin(options, ",", options2, NULL);
1566                 if (!o)
1567                         return log_oom();
1568
1569                 d = cunescape(device);
1570                 p = cunescape(path);
1571                 if (!d || !p)
1572                         return log_oom();
1573
1574                 k = mount_add_one(m, d, p, o, fstype, set_flags);
1575                 if (k < 0)
1576                         r = k;
1577         }
1578
1579         return r;
1580 }
1581
1582 static void mount_shutdown(Manager *m) {
1583         assert(m);
1584
1585         m->mount_event_source = sd_event_source_unref(m->mount_event_source);
1586
1587         if (m->proc_self_mountinfo) {
1588                 fclose(m->proc_self_mountinfo);
1589                 m->proc_self_mountinfo = NULL;
1590         }
1591 }
1592
1593 static int mount_get_timeout(Unit *u, uint64_t *timeout) {
1594         Mount *m = MOUNT(u);
1595         int r;
1596
1597         if (!m->timer_event_source)
1598                 return 0;
1599
1600         r = sd_event_source_get_time(m->timer_event_source, timeout);
1601         if (r < 0)
1602                 return r;
1603
1604         return 1;
1605 }
1606
1607 static int mount_enumerate(Manager *m) {
1608         int r;
1609         assert(m);
1610
1611         if (!m->proc_self_mountinfo) {
1612                 m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
1613                 if (!m->proc_self_mountinfo)
1614                         return -errno;
1615
1616                 r = sd_event_add_io(m->event, &m->mount_event_source, fileno(m->proc_self_mountinfo), EPOLLPRI, mount_dispatch_io, m);
1617                 if (r < 0)
1618                         goto fail;
1619
1620                 /* Dispatch this before we dispatch SIGCHLD, so that
1621                  * we always get the events from /proc/self/mountinfo
1622                  * before the SIGCHLD of /bin/mount. */
1623                 r = sd_event_source_set_priority(m->mount_event_source, -10);
1624                 if (r < 0)
1625                         goto fail;
1626         }
1627
1628         r = mount_load_proc_self_mountinfo(m, false);
1629         if (r < 0)
1630                 goto fail;
1631
1632         return 0;
1633
1634 fail:
1635         mount_shutdown(m);
1636         return r;
1637 }
1638
1639 static int mount_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1640         Manager *m = userdata;
1641         Unit *u;
1642         int r;
1643
1644         assert(m);
1645         assert(revents & EPOLLPRI);
1646
1647         /* The manager calls this for every fd event happening on the
1648          * /proc/self/mountinfo file, which informs us about mounting
1649          * table changes */
1650
1651         r = mount_load_proc_self_mountinfo(m, true);
1652         if (r < 0) {
1653                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1654
1655                 /* Reset flags, just in case, for later calls */
1656                 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1657                         Mount *mount = MOUNT(u);
1658
1659                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1660                 }
1661
1662                 return 0;
1663         }
1664
1665         manager_dispatch_load_queue(m);
1666
1667         LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1668                 Mount *mount = MOUNT(u);
1669
1670                 if (!mount->is_mounted) {
1671
1672                         mount->from_proc_self_mountinfo = false;
1673
1674                         switch (mount->state) {
1675
1676                         case MOUNT_MOUNTED:
1677                                 /* This has just been unmounted by
1678                                  * somebody else, follow the state
1679                                  * change. */
1680                                 mount_enter_dead(mount, MOUNT_SUCCESS);
1681                                 break;
1682
1683                         default:
1684                                 break;
1685                         }
1686
1687                 } else if (mount->just_mounted || mount->just_changed) {
1688
1689                         /* New or changed mount entry */
1690
1691                         switch (mount->state) {
1692
1693                         case MOUNT_DEAD:
1694                         case MOUNT_FAILED:
1695                                 /* This has just been mounted by
1696                                  * somebody else, follow the state
1697                                  * change. */
1698                                 mount_enter_mounted(mount, MOUNT_SUCCESS);
1699                                 break;
1700
1701                         case MOUNT_MOUNTING:
1702                                 mount_set_state(mount, MOUNT_MOUNTING_DONE);
1703                                 break;
1704
1705                         default:
1706                                 /* Nothing really changed, but let's
1707                                  * issue an notification call
1708                                  * nonetheless, in case somebody is
1709                                  * waiting for this. (e.g. file system
1710                                  * ro/rw remounts.) */
1711                                 mount_set_state(mount, mount->state);
1712                                 break;
1713                         }
1714                 }
1715
1716                 /* Reset the flags for later calls */
1717                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1718         }
1719
1720         return 0;
1721 }
1722
1723 static void mount_reset_failed(Unit *u) {
1724         Mount *m = MOUNT(u);
1725
1726         assert(m);
1727
1728         if (m->state == MOUNT_FAILED)
1729                 mount_set_state(m, MOUNT_DEAD);
1730
1731         m->result = MOUNT_SUCCESS;
1732         m->reload_result = MOUNT_SUCCESS;
1733 }
1734
1735 static int mount_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
1736         return unit_kill_common(u, who, signo, -1, MOUNT(u)->control_pid, error);
1737 }
1738
1739 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1740         [MOUNT_DEAD] = "dead",
1741         [MOUNT_MOUNTING] = "mounting",
1742         [MOUNT_MOUNTING_DONE] = "mounting-done",
1743         [MOUNT_MOUNTED] = "mounted",
1744         [MOUNT_REMOUNTING] = "remounting",
1745         [MOUNT_UNMOUNTING] = "unmounting",
1746         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1747         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1748         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1749         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1750         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1751         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1752         [MOUNT_FAILED] = "failed"
1753 };
1754
1755 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1756
1757 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1758         [MOUNT_EXEC_MOUNT] = "ExecMount",
1759         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1760         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1761 };
1762
1763 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1764
1765 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1766         [MOUNT_SUCCESS] = "success",
1767         [MOUNT_FAILURE_RESOURCES] = "resources",
1768         [MOUNT_FAILURE_TIMEOUT] = "timeout",
1769         [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1770         [MOUNT_FAILURE_SIGNAL] = "signal",
1771         [MOUNT_FAILURE_CORE_DUMP] = "core-dump"
1772 };
1773
1774 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1775
1776 const UnitVTable mount_vtable = {
1777         .object_size = sizeof(Mount),
1778         .exec_context_offset = offsetof(Mount, exec_context),
1779         .cgroup_context_offset = offsetof(Mount, cgroup_context),
1780         .kill_context_offset = offsetof(Mount, kill_context),
1781         .exec_runtime_offset = offsetof(Mount, exec_runtime),
1782
1783         .sections =
1784                 "Unit\0"
1785                 "Mount\0"
1786                 "Install\0",
1787         .private_section = "Mount",
1788
1789         .no_alias = true,
1790         .no_instances = true,
1791
1792         .init = mount_init,
1793         .load = mount_load,
1794         .done = mount_done,
1795
1796         .coldplug = mount_coldplug,
1797
1798         .dump = mount_dump,
1799
1800         .start = mount_start,
1801         .stop = mount_stop,
1802         .reload = mount_reload,
1803
1804         .kill = mount_kill,
1805
1806         .serialize = mount_serialize,
1807         .deserialize_item = mount_deserialize_item,
1808
1809         .active_state = mount_active_state,
1810         .sub_state_to_string = mount_sub_state_to_string,
1811
1812         .check_gc = mount_check_gc,
1813
1814         .sigchld_event = mount_sigchld_event,
1815
1816         .reset_failed = mount_reset_failed,
1817
1818         .bus_interface = "org.freedesktop.systemd1.Mount",
1819         .bus_vtable = bus_mount_vtable,
1820         .bus_set_property = bus_mount_set_property,
1821         .bus_commit_properties = bus_mount_commit_properties,
1822
1823         .get_timeout = mount_get_timeout,
1824
1825         .can_transient = true,
1826
1827         .enumerate = mount_enumerate,
1828         .shutdown = mount_shutdown,
1829
1830         .status_message_formats = {
1831                 .starting_stopping = {
1832                         [0] = "Mounting %s...",
1833                         [1] = "Unmounting %s...",
1834                 },
1835                 .finished_start_job = {
1836                         [JOB_DONE]       = "Mounted %s.",
1837                         [JOB_FAILED]     = "Failed to mount %s.",
1838                         [JOB_DEPENDENCY] = "Dependency failed for %s.",
1839                         [JOB_TIMEOUT]    = "Timed out mounting %s.",
1840                 },
1841                 .finished_stop_job = {
1842                         [JOB_DONE]       = "Unmounted %s.",
1843                         [JOB_FAILED]     = "Failed unmounting %s.",
1844                         [JOB_TIMEOUT]    = "Timed out unmounting %s.",
1845                 },
1846         },
1847 };