src/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 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 <stdio.h>
  24 #include <mntent.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27
  28 #include "unit.h"
  29 #include "mount.h"
  30 #include "load-fragment.h"
  31 #include "load-dropin.h"
  32 #include "log.h"
  33 #include "strv.h"
  34 #include "mount-setup.h"
  35 #include "unit-name.h"
  36 #include "dbus-mount.h"
  37 #include "special.h"
  38 #include "bus-errors.h"
  39 #include "exit-status.h"
  40 #include "def.h"
  41
  42 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  43         [MOUNT_DEAD] = UNIT_INACTIVE,
  44         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  45         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  46         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  47         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  48         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  49         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  50         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  51         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  52         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  53         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  54         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  55         [MOUNT_FAILED] = UNIT_FAILED
  56 };
  57
  58 static void mount_init(Unit *u) {
  59         Mount *m = MOUNT(u);
  60
  61         assert(u);
  62         assert(u->load_state == UNIT_STUB);
  63
  64         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  65         m->directory_mode = 0755;
  66
  67         exec_context_init(&m->exec_context);
  68
  69         /* The stdio/kmsg bridge socket is on /, in order to avoid a
  70          * dep loop, don't use kmsg logging for -.mount */
  71         if (!unit_has_name(u, "-.mount")) {
  72                 m->exec_context.std_output = u->manager->default_std_output;
  73                 m->exec_context.std_error = u->manager->default_std_error;
  74         }
  75
  76         /* We need to make sure that /bin/mount is always called in
  77          * the same process group as us, so that the autofs kernel
  78          * side doesn't send us another mount request while we are
  79          * already trying to comply its last one. */
  80         m->exec_context.same_pgrp = true;
  81
  82         m->timer_watch.type = WATCH_INVALID;
  83
  84         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  85
  86         UNIT(m)->ignore_on_isolate = true;
  87 }
  88
  89 static void mount_unwatch_control_pid(Mount *m) {
  90         assert(m);
  91
  92         if (m->control_pid <= 0)
  93                 return;
  94
  95         unit_unwatch_pid(UNIT(m), m->control_pid);
  96         m->control_pid = 0;
  97 }
  98
  99 static void mount_parameters_done(MountParameters *p) {
 100         assert(p);
 101
 102         free(p->what);
 103         free(p->options);
 104         free(p->fstype);
 105
 106         p->what = p->options = p->fstype = NULL;
 107 }
 108
 109 static void mount_done(Unit *u) {
 110         Mount *m = MOUNT(u);
 111
 112         assert(m);
 113
 114         free(m->where);
 115         m->where = NULL;
 116
 117         mount_parameters_done(&m->parameters_etc_fstab);
 118         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 119         mount_parameters_done(&m->parameters_fragment);
 120
 121         exec_context_done(&m->exec_context);
 122         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 123         m->control_command = NULL;
 124
 125         mount_unwatch_control_pid(m);
 126
 127         unit_unwatch_timer(u, &m->timer_watch);
 128 }
 129
 130 static MountParameters* get_mount_parameters_configured(Mount *m) {
 131         assert(m);
 132
 133         if (m->from_fragment)
 134                 return &m->parameters_fragment;
 135         else if (m->from_etc_fstab)
 136                 return &m->parameters_etc_fstab;
 137
 138         return NULL;
 139 }
 140
 141 static MountParameters* get_mount_parameters(Mount *m) {
 142         assert(m);
 143
 144         if (m->from_proc_self_mountinfo)
 145                 return &m->parameters_proc_self_mountinfo;
 146
 147         return get_mount_parameters_configured(m);
 148 }
 149
 150 static int mount_add_mount_links(Mount *m) {
 151         Unit *other;
 152         int r;
 153         MountParameters *pm;
 154
 155         assert(m);
 156
 157         pm = get_mount_parameters_configured(m);
 158
 159         /* Adds in links to other mount points that might lie below or
 160          * above us in the hierarchy */
 161
 162         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_MOUNT]) {
 163                 Mount *n = MOUNT(other);
 164                 MountParameters *pn;
 165
 166                 if (n == m)
 167                         continue;
 168
 169                 if (UNIT(n)->load_state != UNIT_LOADED)
 170                         continue;
 171
 172                 pn = get_mount_parameters_configured(n);
 173
 174                 if (path_startswith(m->where, n->where)) {
 175
 176                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 177                                 return r;
 178
 179                         if (pn)
 180                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 181                                         return r;
 182
 183                 } else if (path_startswith(n->where, m->where)) {
 184
 185                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 186                                 return r;
 187
 188                         if (pm)
 189                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 190                                         return r;
 191
 192                 } else if (pm && path_startswith(pm->what, n->where)) {
 193
 194                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 195                                 return r;
 196
 197                         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 198                                 return r;
 199
 200                 } else if (pn && path_startswith(pn->what, m->where)) {
 201
 202                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 203                                 return r;
 204
 205                         if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 206                                 return r;
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 static int mount_add_swap_links(Mount *m) {
 214         Unit *other;
 215         int r;
 216
 217         assert(m);
 218
 219         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_SWAP])
 220                 if ((r = swap_add_one_mount_link(SWAP(other), m)) < 0)
 221                         return r;
 222
 223         return 0;
 224 }
 225
 226 static int mount_add_path_links(Mount *m) {
 227         Unit *other;
 228         int r;
 229
 230         assert(m);
 231
 232         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_PATH])
 233                 if ((r = path_add_one_mount_link(PATH(other), m)) < 0)
 234                         return r;
 235
 236         return 0;
 237 }
 238
 239 static int mount_add_automount_links(Mount *m) {
 240         Unit *other;
 241         int r;
 242
 243         assert(m);
 244
 245         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_AUTOMOUNT])
 246                 if ((r = automount_add_one_mount_link(AUTOMOUNT(other), m)) < 0)
 247                         return r;
 248
 249         return 0;
 250 }
 251
 252 static int mount_add_socket_links(Mount *m) {
 253         Unit *other;
 254         int r;
 255
 256         assert(m);
 257
 258         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_SOCKET])
 259                 if ((r = socket_add_one_mount_link(SOCKET(other), m)) < 0)
 260                         return r;
 261
 262         return 0;
 263 }
 264
 265 static char* mount_test_option(const char *haystack, const char *needle) {
 266         struct mntent me;
 267
 268         assert(needle);
 269
 270         /* Like glibc's hasmntopt(), but works on a string, not a
 271          * struct mntent */
 272
 273         if (!haystack)
 274                 return false;
 275
 276         zero(me);
 277         me.mnt_opts = (char*) haystack;
 278
 279         return hasmntopt(&me, needle);
 280 }
 281
 282 static bool mount_is_network(MountParameters *p) {
 283         assert(p);
 284
 285         if (mount_test_option(p->options, "_netdev"))
 286                 return true;
 287
 288         if (p->fstype && fstype_is_network(p->fstype))
 289                 return true;
 290
 291         return false;
 292 }
 293
 294 static bool mount_is_bind(MountParameters *p) {
 295         assert(p);
 296
 297         if (mount_test_option(p->options, "bind"))
 298                 return true;
 299
 300         if (p->fstype && streq(p->fstype, "bind"))
 301                 return true;
 302
 303         return false;
 304 }
 305
 306 static bool needs_quota(MountParameters *p) {
 307         assert(p);
 308
 309         if (mount_is_network(p))
 310                 return false;
 311
 312         if (mount_is_bind(p))
 313                 return false;
 314
 315         return mount_test_option(p->options, "usrquota") ||
 316                 mount_test_option(p->options, "grpquota") ||
 317                 mount_test_option(p->options, "quota") ||
 318                 mount_test_option(p->options, "usrjquota") ||
 319                 mount_test_option(p->options, "grpjquota");
 320 }
 321
 322 static int mount_add_fstab_links(Mount *m) {
 323         const char *target, *after = NULL, *after2 = NULL;
 324         MountParameters *p;
 325         Unit *tu;
 326         int r;
 327         bool noauto, nofail, handle, automount;
 328
 329         assert(m);
 330
 331         if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
 332                 return 0;
 333
 334         if (!(p = get_mount_parameters_configured(m)))
 335                 return 0;
 336
 337         if (p != &m->parameters_etc_fstab)
 338                 return 0;
 339
 340         noauto = !!mount_test_option(p->options, "noauto");
 341         nofail = !!mount_test_option(p->options, "nofail");
 342         automount =
 343                 mount_test_option(p->options, "comment=systemd.automount") ||
 344                 mount_test_option(p->options, "x-systemd-automount");
 345         handle =
 346                 automount ||
 347                 mount_test_option(p->options, "comment=systemd.mount") ||
 348                 mount_test_option(p->options, "x-systemd-mount") ||
 349                 UNIT(m)->manager->mount_auto;
 350
 351         if (mount_is_network(p)) {
 352                 target = SPECIAL_REMOTE_FS_TARGET;
 353                 after = SPECIAL_REMOTE_FS_PRE_TARGET;
 354                 after2 = SPECIAL_NETWORK_TARGET;
 355         } else {
 356                 target = SPECIAL_LOCAL_FS_TARGET;
 357                 after = SPECIAL_LOCAL_FS_PRE_TARGET;
 358         }
 359
 360         if ((r = manager_load_unit(UNIT(m)->manager, target, NULL, NULL, &tu)) < 0)
 361                 return r;
 362
 363         if (after)
 364                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0)
 365                         return r;
 366
 367         if (after2)
 368                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after2, NULL, true)) < 0)
 369                         return r;
 370
 371         if (automount) {
 372                 Unit *am;
 373
 374                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 375                         return r;
 376
 377                 /* If auto is configured as well also pull in the
 378                  * mount right-away, but don't rely on it. */
 379                 if (!noauto) /* automount + auto */
 380                         if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 381                                 return r;
 382
 383                 /* Install automount unit */
 384                 if (!nofail) /* automount + fail */
 385                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, am, true);
 386                 else /* automount + nofail */
 387                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, am, true);
 388
 389         } else if (handle && !noauto) {
 390
 391                 /* Automatically add mount points that aren't natively
 392                  * configured to local-fs.target */
 393
 394                 if (!nofail) /* auto + fail */
 395                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
 396                 else /* auto + nofail */
 397                         return unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true);
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int mount_add_device_links(Mount *m) {
 404         MountParameters *p;
 405         int r;
 406
 407         assert(m);
 408
 409         if (!(p = get_mount_parameters_configured(m)))
 410                 return 0;
 411
 412         if (!p->what)
 413                 return 0;
 414
 415         if (!mount_is_bind(p) &&
 416             !path_equal(m->where, "/") &&
 417             p == &m->parameters_etc_fstab) {
 418                 bool nofail, noauto;
 419
 420                 noauto = !!mount_test_option(p->options, "noauto");
 421                 nofail = !!mount_test_option(p->options, "nofail");
 422
 423                 if ((r = unit_add_node_link(UNIT(m), p->what,
 424                                             !noauto && nofail &&
 425                                             UNIT(m)->manager->running_as == MANAGER_SYSTEM)) < 0)
 426                         return r;
 427         }
 428
 429         if (p->passno > 0 &&
 430             !mount_is_bind(p) &&
 431             UNIT(m)->manager->running_as == MANAGER_SYSTEM &&
 432             !path_equal(m->where, "/")) {
 433                 char *name;
 434                 Unit *fsck;
 435                 /* Let's add in the fsck service */
 436
 437                 /* aka SPECIAL_FSCK_SERVICE */
 438                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 439                         return -ENOMEM;
 440
 441                 if ((r = manager_load_unit_prepare(UNIT(m)->manager, name, NULL, NULL, &fsck)) < 0) {
 442                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 443                         free(name);
 444                         return r;
 445                 }
 446
 447                 free(name);
 448
 449                 SERVICE(fsck)->fsck_passno = p->passno;
 450
 451                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 452                         return r;
 453         }
 454
 455         return 0;
 456 }
 457
 458 static int mount_add_default_dependencies(Mount *m) {
 459         int r;
 460         MountParameters *p;
 461
 462         assert(m);
 463
 464         if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
 465                 return 0;
 466
 467         p = get_mount_parameters_configured(m);
 468         if (p && needs_quota(p)) {
 469                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
 470                     (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
 471                         return r;
 472         }
 473
 474         if (!path_equal(m->where, "/"))
 475                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 476                         return r;
 477
 478         return 0;
 479 }
 480
 481 static int mount_fix_timeouts(Mount *m) {
 482         MountParameters *p;
 483         const char *timeout = NULL;
 484         Unit *other;
 485         Iterator i;
 486         usec_t u;
 487         char *t;
 488         int r;
 489
 490         assert(m);
 491
 492         if (!(p = get_mount_parameters_configured(m)))
 493                 return 0;
 494
 495         /* Allow configuration how long we wait for a device that
 496          * backs a mount point to show up. This is useful to support
 497          * endless device timeouts for devices that show up only after
 498          * user input, like crypto devices. */
 499
 500         if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
 501                 timeout += 31;
 502         else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
 503                 timeout += 25;
 504         else
 505                 return 0;
 506
 507         t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
 508         if (!t)
 509                 return -ENOMEM;
 510
 511         r = parse_usec(t, &u);
 512         free(t);
 513
 514         if (r < 0) {
 515                 log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
 516                 return r;
 517         }
 518
 519         SET_FOREACH(other, UNIT(m)->dependencies[UNIT_AFTER], i) {
 520                 if (other->type != UNIT_DEVICE)
 521                         continue;
 522
 523                 other->job_timeout = u;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int mount_verify(Mount *m) {
 530         bool b;
 531         char *e;
 532         assert(m);
 533
 534         if (UNIT(m)->load_state != UNIT_LOADED)
 535                 return 0;
 536
 537         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 538                 return -ENOENT;
 539
 540         if (!(e = unit_name_from_path(m->where, ".mount")))
 541                 return -ENOMEM;
 542
 543         b = unit_has_name(UNIT(m), e);
 544         free(e);
 545
 546         if (!b) {
 547                 log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(m)->id);
 548                 return -EINVAL;
 549         }
 550
 551         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 552                 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
 553                 return -EINVAL;
 554         }
 555
 556         if (UNIT(m)->fragment_path && !m->parameters_fragment.what) {
 557                 log_error("%s's What setting is missing. Refusing.", UNIT(m)->id);
 558                 return -EBADMSG;
 559         }
 560
 561         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 562                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(m)->id);
 563                 return -EINVAL;
 564         }
 565
 566         return 0;
 567 }
 568
 569 static int mount_load(Unit *u) {
 570         Mount *m = MOUNT(u);
 571         int r;
 572
 573         assert(u);
 574         assert(u->load_state == UNIT_STUB);
 575
 576         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 577                 return r;
 578
 579         /* This is a new unit? Then let's add in some extras */
 580         if (u->load_state == UNIT_LOADED) {
 581                 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
 582                         return r;
 583
 584                 if (UNIT(m)->fragment_path)
 585                         m->from_fragment = true;
 586                 else if (m->from_etc_fstab)
 587                         /* We always add several default dependencies to fstab mounts,
 588                          * but we do not want the implicit complementing of Wants= with After=
 589                          * in the target unit that this mount unit will be hooked into. */
 590                         UNIT(m)->default_dependencies = false;
 591
 592                 if (!m->where)
 593                         if (!(m->where = unit_name_to_path(u->id)))
 594                                 return -ENOMEM;
 595
 596                 path_kill_slashes(m->where);
 597
 598                 if (!UNIT(m)->description)
 599                         if ((r = unit_set_description(u, m->where)) < 0)
 600                                 return r;
 601
 602                 if ((r = mount_add_device_links(m)) < 0)
 603                         return r;
 604
 605                 if ((r = mount_add_mount_links(m)) < 0)
 606                         return r;
 607
 608                 if ((r = mount_add_socket_links(m)) < 0)
 609                         return r;
 610
 611                 if ((r = mount_add_swap_links(m)) < 0)
 612                         return r;
 613
 614                 if ((r = mount_add_path_links(m)) < 0)
 615                         return r;
 616
 617                 if ((r = mount_add_automount_links(m)) < 0)
 618                         return r;
 619
 620                 if ((r = mount_add_fstab_links(m)) < 0)
 621                         return r;
 622
 623                 if (UNIT(m)->default_dependencies || m->from_etc_fstab)
 624                         if ((r = mount_add_default_dependencies(m)) < 0)
 625                                 return r;
 626
 627                 if ((r = unit_add_default_cgroups(u)) < 0)
 628                         return r;
 629
 630                 mount_fix_timeouts(m);
 631         }
 632
 633         return mount_verify(m);
 634 }
 635
 636 static int mount_notify_automount(Mount *m, int status) {
 637         Unit *p;
 638         int r;
 639         Iterator i;
 640
 641         assert(m);
 642
 643         SET_FOREACH(p, UNIT(m)->dependencies[UNIT_TRIGGERED_BY], i)
 644                 if (p->type == UNIT_AUTOMOUNT) {
 645                          r = automount_send_ready(AUTOMOUNT(p), status);
 646                          if (r < 0)
 647                                  return r;
 648                 }
 649
 650         return 0;
 651 }
 652
 653 static void mount_set_state(Mount *m, MountState state) {
 654         MountState old_state;
 655         assert(m);
 656
 657         old_state = m->state;
 658         m->state = state;
 659
 660         if (state != MOUNT_MOUNTING &&
 661             state != MOUNT_MOUNTING_DONE &&
 662             state != MOUNT_REMOUNTING &&
 663             state != MOUNT_UNMOUNTING &&
 664             state != MOUNT_MOUNTING_SIGTERM &&
 665             state != MOUNT_MOUNTING_SIGKILL &&
 666             state != MOUNT_UNMOUNTING_SIGTERM &&
 667             state != MOUNT_UNMOUNTING_SIGKILL &&
 668             state != MOUNT_REMOUNTING_SIGTERM &&
 669             state != MOUNT_REMOUNTING_SIGKILL) {
 670                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 671                 mount_unwatch_control_pid(m);
 672                 m->control_command = NULL;
 673                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 674         }
 675
 676         if (state == MOUNT_MOUNTED ||
 677             state == MOUNT_REMOUNTING)
 678                 mount_notify_automount(m, 0);
 679         else if (state == MOUNT_DEAD ||
 680                  state == MOUNT_UNMOUNTING ||
 681                  state == MOUNT_MOUNTING_SIGTERM ||
 682                  state == MOUNT_MOUNTING_SIGKILL ||
 683                  state == MOUNT_REMOUNTING_SIGTERM ||
 684                  state == MOUNT_REMOUNTING_SIGKILL ||
 685                  state == MOUNT_UNMOUNTING_SIGTERM ||
 686                  state == MOUNT_UNMOUNTING_SIGKILL ||
 687                  state == MOUNT_FAILED)
 688                 mount_notify_automount(m, -ENODEV);
 689
 690         if (state != old_state)
 691                 log_debug("%s changed %s -> %s",
 692                           UNIT(m)->id,
 693                           mount_state_to_string(old_state),
 694                           mount_state_to_string(state));
 695
 696         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], !m->reload_failure);
 697         m->reload_failure = false;
 698 }
 699
 700 static int mount_coldplug(Unit *u) {
 701         Mount *m = MOUNT(u);
 702         MountState new_state = MOUNT_DEAD;
 703         int r;
 704
 705         assert(m);
 706         assert(m->state == MOUNT_DEAD);
 707
 708         if (m->deserialized_state != m->state)
 709                 new_state = m->deserialized_state;
 710         else if (m->from_proc_self_mountinfo)
 711                 new_state = MOUNT_MOUNTED;
 712
 713         if (new_state != m->state) {
 714
 715                 if (new_state == MOUNT_MOUNTING ||
 716                     new_state == MOUNT_MOUNTING_DONE ||
 717                     new_state == MOUNT_REMOUNTING ||
 718                     new_state == MOUNT_UNMOUNTING ||
 719                     new_state == MOUNT_MOUNTING_SIGTERM ||
 720                     new_state == MOUNT_MOUNTING_SIGKILL ||
 721                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 722                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 723                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 724                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 725
 726                         if (m->control_pid <= 0)
 727                                 return -EBADMSG;
 728
 729                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 730                                 return r;
 731
 732                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 733                                 return r;
 734                 }
 735
 736                 mount_set_state(m, new_state);
 737         }
 738
 739         return 0;
 740 }
 741
 742 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 743         Mount *m = MOUNT(u);
 744         MountParameters *p;
 745
 746         assert(m);
 747         assert(f);
 748
 749         p = get_mount_parameters(m);
 750
 751         fprintf(f,
 752                 "%sMount State: %s\n"
 753                 "%sWhere: %s\n"
 754                 "%sWhat: %s\n"
 755                 "%sFile System Type: %s\n"
 756                 "%sOptions: %s\n"
 757                 "%sFrom /etc/fstab: %s\n"
 758                 "%sFrom /proc/self/mountinfo: %s\n"
 759                 "%sFrom fragment: %s\n"
 760                 "%sDirectoryMode: %04o\n",
 761                 prefix, mount_state_to_string(m->state),
 762                 prefix, m->where,
 763                 prefix, strna(p->what),
 764                 prefix, strna(p->fstype),
 765                 prefix, strna(p->options),
 766                 prefix, yes_no(m->from_etc_fstab),
 767                 prefix, yes_no(m->from_proc_self_mountinfo),
 768                 prefix, yes_no(m->from_fragment),
 769                 prefix, m->directory_mode);
 770
 771         if (m->control_pid > 0)
 772                 fprintf(f,
 773                         "%sControl PID: %lu\n",
 774                         prefix, (unsigned long) m->control_pid);
 775
 776         exec_context_dump(&m->exec_context, f, prefix);
 777 }
 778
 779 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 780         pid_t pid;
 781         int r;
 782
 783         assert(m);
 784         assert(c);
 785         assert(_pid);
 786
 787         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 788                 goto fail;
 789
 790         if ((r = exec_spawn(c,
 791                             NULL,
 792                             &m->exec_context,
 793                             NULL, 0,
 794                             UNIT(m)->manager->environment,
 795                             true,
 796                             true,
 797                             true,
 798                             UNIT(m)->manager->confirm_spawn,
 799                             UNIT(m)->cgroup_bondings,
 800                             UNIT(m)->cgroup_attributes,
 801                             &pid)) < 0)
 802                 goto fail;
 803
 804         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 805                 /* FIXME: we need to do something here */
 806                 goto fail;
 807
 808         *_pid = pid;
 809
 810         return 0;
 811
 812 fail:
 813         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 814
 815         return r;
 816 }
 817
 818 static void mount_enter_dead(Mount *m, bool success) {
 819         assert(m);
 820
 821         if (!success)
 822                 m->failure = true;
 823
 824         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 825 }
 826
 827 static void mount_enter_mounted(Mount *m, bool success) {
 828         assert(m);
 829
 830         if (!success)
 831                 m->failure = true;
 832
 833         mount_set_state(m, MOUNT_MOUNTED);
 834 }
 835
 836 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 837         int r;
 838         Set *pid_set = NULL;
 839         bool wait_for_exit = false;
 840
 841         assert(m);
 842
 843         if (!success)
 844                 m->failure = true;
 845
 846         if (m->exec_context.kill_mode != KILL_NONE) {
 847                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 848                            state == MOUNT_UNMOUNTING_SIGTERM ||
 849                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 850
 851                 if (m->control_pid > 0) {
 852                         if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
 853
 854                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 855                         else
 856                                 wait_for_exit = true;
 857                 }
 858
 859                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 860
 861                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 862                                 r = -ENOMEM;
 863                                 goto fail;
 864                         }
 865
 866                         /* Exclude the control pid from being killed via the cgroup */
 867                         if (m->control_pid > 0)
 868                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 869                                         goto fail;
 870
 871                         if ((r = cgroup_bonding_kill_list(UNIT(m)->cgroup_bondings, sig, true, pid_set)) < 0) {
 872                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 873                                         log_warning("Failed to kill control group: %s", strerror(-r));
 874                         } else if (r > 0)
 875                                 wait_for_exit = true;
 876
 877                         set_free(pid_set);
 878                         pid_set = NULL;
 879                 }
 880         }
 881
 882         if (wait_for_exit) {
 883                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 884                         goto fail;
 885
 886                 mount_set_state(m, state);
 887         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 888                 mount_enter_mounted(m, true);
 889         else
 890                 mount_enter_dead(m, true);
 891
 892         return;
 893
 894 fail:
 895         log_warning("%s failed to kill processes: %s", UNIT(m)->id, strerror(-r));
 896
 897         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 898                 mount_enter_mounted(m, false);
 899         else
 900                 mount_enter_dead(m, false);
 901
 902         if (pid_set)
 903                 set_free(pid_set);
 904 }
 905
 906 static void mount_enter_unmounting(Mount *m, bool success) {
 907         int r;
 908
 909         assert(m);
 910
 911         if (!success)
 912                 m->failure = true;
 913
 914         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 915         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 916
 917         if ((r = exec_command_set(
 918                              m->control_command,
 919                              "/bin/umount",
 920                              m->where,
 921                              NULL)) < 0)
 922                 goto fail;
 923
 924         mount_unwatch_control_pid(m);
 925
 926         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 927                 goto fail;
 928
 929         mount_set_state(m, MOUNT_UNMOUNTING);
 930
 931         return;
 932
 933 fail:
 934         log_warning("%s failed to run 'umount' task: %s", UNIT(m)->id, strerror(-r));
 935         mount_enter_mounted(m, false);
 936 }
 937
 938 static void mount_enter_mounting(Mount *m) {
 939         int r;
 940         MountParameters *p;
 941
 942         assert(m);
 943
 944         m->control_command_id = MOUNT_EXEC_MOUNT;
 945         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 946
 947         mkdir_p(m->where, m->directory_mode);
 948
 949         /* Create the source directory for bind-mounts if needed */
 950         p = get_mount_parameters_configured(m);
 951         if (p && mount_is_bind(p))
 952                 mkdir_p(p->what, m->directory_mode);
 953
 954         if (m->from_fragment)
 955                 r = exec_command_set(
 956                                 m->control_command,
 957                                 "/bin/mount",
 958                                 m->parameters_fragment.what,
 959                                 m->where,
 960                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 961                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 962                                 NULL);
 963         else if (m->from_etc_fstab)
 964                 r = exec_command_set(
 965                                 m->control_command,
 966                                 "/bin/mount",
 967                                 m->where,
 968                                 NULL);
 969         else
 970                 r = -ENOENT;
 971
 972         if (r < 0)
 973                 goto fail;
 974
 975         mount_unwatch_control_pid(m);
 976
 977         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 978                 goto fail;
 979
 980         mount_set_state(m, MOUNT_MOUNTING);
 981
 982         return;
 983
 984 fail:
 985         log_warning("%s failed to run 'mount' task: %s", UNIT(m)->id, strerror(-r));
 986         mount_enter_dead(m, false);
 987 }
 988
 989 static void mount_enter_mounting_done(Mount *m) {
 990         assert(m);
 991
 992         mount_set_state(m, MOUNT_MOUNTING_DONE);
 993 }
 994
 995 static void mount_enter_remounting(Mount *m, bool success) {
 996         int r;
 997
 998         assert(m);
 999
1000         if (!success)
1001                 m->failure = true;
1002
1003         m->control_command_id = MOUNT_EXEC_REMOUNT;
1004         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1005
1006         if (m->from_fragment) {
1007                 char *buf = NULL;
1008                 const char *o;
1009
1010                 if (m->parameters_fragment.options) {
1011                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
1012                                 r = -ENOMEM;
1013                                 goto fail;
1014                         }
1015
1016                         o = buf;
1017                 } else
1018                         o = "remount";
1019
1020                 r = exec_command_set(
1021                                 m->control_command,
1022                                 "/bin/mount",
1023                                 m->parameters_fragment.what,
1024                                 m->where,
1025                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
1026                                 "-o", o,
1027                                 NULL);
1028
1029                 free(buf);
1030         } else if (m->from_etc_fstab)
1031                 r = exec_command_set(
1032                                 m->control_command,
1033                                 "/bin/mount",
1034                                 m->where,
1035                                 "-o", "remount",
1036                                 NULL);
1037         else
1038                 r = -ENOENT;
1039
1040         if (r < 0)
1041                 goto fail;
1042
1043         mount_unwatch_control_pid(m);
1044
1045         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
1046                 goto fail;
1047
1048         mount_set_state(m, MOUNT_REMOUNTING);
1049
1050         return;
1051
1052 fail:
1053         log_warning("%s failed to run 'remount' task: %s", UNIT(m)->id, strerror(-r));
1054         m->reload_failure = true;
1055         mount_enter_mounted(m, true);
1056 }
1057
1058 static int mount_start(Unit *u) {
1059         Mount *m = MOUNT(u);
1060
1061         assert(m);
1062
1063         /* We cannot fulfill this request right now, try again later
1064          * please! */
1065         if (m->state == MOUNT_UNMOUNTING ||
1066             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1067             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1068             m->state == MOUNT_MOUNTING_SIGTERM ||
1069             m->state == MOUNT_MOUNTING_SIGKILL)
1070                 return -EAGAIN;
1071
1072         /* Already on it! */
1073         if (m->state == MOUNT_MOUNTING)
1074                 return 0;
1075
1076         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1077
1078         m->failure = false;
1079         mount_enter_mounting(m);
1080         return 0;
1081 }
1082
1083 static int mount_stop(Unit *u) {
1084         Mount *m = MOUNT(u);
1085
1086         assert(m);
1087
1088         /* Already on it */
1089         if (m->state == MOUNT_UNMOUNTING ||
1090             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1091             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1092             m->state == MOUNT_MOUNTING_SIGTERM ||
1093             m->state == MOUNT_MOUNTING_SIGKILL)
1094                 return 0;
1095
1096         assert(m->state == MOUNT_MOUNTING ||
1097                m->state == MOUNT_MOUNTING_DONE ||
1098                m->state == MOUNT_MOUNTED ||
1099                m->state == MOUNT_REMOUNTING ||
1100                m->state == MOUNT_REMOUNTING_SIGTERM ||
1101                m->state == MOUNT_REMOUNTING_SIGKILL);
1102
1103         mount_enter_unmounting(m, true);
1104         return 0;
1105 }
1106
1107 static int mount_reload(Unit *u) {
1108         Mount *m = MOUNT(u);
1109
1110         assert(m);
1111
1112         if (m->state == MOUNT_MOUNTING_DONE)
1113                 return -EAGAIN;
1114
1115         assert(m->state == MOUNT_MOUNTED);
1116
1117         mount_enter_remounting(m, true);
1118         return 0;
1119 }
1120
1121 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1122         Mount *m = MOUNT(u);
1123
1124         assert(m);
1125         assert(f);
1126         assert(fds);
1127
1128         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1129         unit_serialize_item(u, f, "failure", yes_no(m->failure));
1130
1131         if (m->control_pid > 0)
1132                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1133
1134         if (m->control_command_id >= 0)
1135                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1136
1137         return 0;
1138 }
1139
1140 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1141         Mount *m = MOUNT(u);
1142
1143         assert(u);
1144         assert(key);
1145         assert(value);
1146         assert(fds);
1147
1148         if (streq(key, "state")) {
1149                 MountState state;
1150
1151                 if ((state = mount_state_from_string(value)) < 0)
1152                         log_debug("Failed to parse state value %s", value);
1153                 else
1154                         m->deserialized_state = state;
1155         } else if (streq(key, "failure")) {
1156                 int b;
1157
1158                 if ((b = parse_boolean(value)) < 0)
1159                         log_debug("Failed to parse failure value %s", value);
1160                 else
1161                         m->failure = b || m->failure;
1162
1163         } else if (streq(key, "control-pid")) {
1164                 pid_t pid;
1165
1166                 if (parse_pid(value, &pid) < 0)
1167                         log_debug("Failed to parse control-pid value %s", value);
1168                 else
1169                         m->control_pid = pid;
1170         } else if (streq(key, "control-command")) {
1171                 MountExecCommand id;
1172
1173                 if ((id = mount_exec_command_from_string(value)) < 0)
1174                         log_debug("Failed to parse exec-command value %s", value);
1175                 else {
1176                         m->control_command_id = id;
1177                         m->control_command = m->exec_command + id;
1178                 }
1179
1180         } else
1181                 log_debug("Unknown serialization key '%s'", key);
1182
1183         return 0;
1184 }
1185
1186 static UnitActiveState mount_active_state(Unit *u) {
1187         assert(u);
1188
1189         return state_translation_table[MOUNT(u)->state];
1190 }
1191
1192 static const char *mount_sub_state_to_string(Unit *u) {
1193         assert(u);
1194
1195         return mount_state_to_string(MOUNT(u)->state);
1196 }
1197
1198 static bool mount_check_gc(Unit *u) {
1199         Mount *m = MOUNT(u);
1200
1201         assert(m);
1202
1203         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1204 }
1205
1206 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1207         Mount *m = MOUNT(u);
1208         bool success;
1209
1210         assert(m);
1211         assert(pid >= 0);
1212
1213         if (pid != m->control_pid)
1214                 return;
1215
1216         m->control_pid = 0;
1217
1218         success = is_clean_exit(code, status);
1219         m->failure = m->failure || !success;
1220
1221         if (m->control_command) {
1222                 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1223                 m->control_command = NULL;
1224                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1225         }
1226
1227         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1228                  "%s mount process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
1229
1230         /* Note that mount(8) returning and the kernel sending us a
1231          * mount table change event might happen out-of-order. If an
1232          * operation succeed we assume the kernel will follow soon too
1233          * and already change into the resulting state.  If it fails
1234          * we check if the kernel still knows about the mount. and
1235          * change state accordingly. */
1236
1237         switch (m->state) {
1238
1239         case MOUNT_MOUNTING:
1240         case MOUNT_MOUNTING_DONE:
1241         case MOUNT_MOUNTING_SIGKILL:
1242         case MOUNT_MOUNTING_SIGTERM:
1243
1244                 if (success)
1245                         mount_enter_mounted(m, true);
1246                 else if (m->from_proc_self_mountinfo)
1247                         mount_enter_mounted(m, false);
1248                 else
1249                         mount_enter_dead(m, false);
1250                 break;
1251
1252         case MOUNT_REMOUNTING:
1253         case MOUNT_REMOUNTING_SIGKILL:
1254         case MOUNT_REMOUNTING_SIGTERM:
1255
1256                 m->reload_failure = !success;
1257                 if (m->from_proc_self_mountinfo)
1258                         mount_enter_mounted(m, true);
1259                 else
1260                         mount_enter_dead(m, true);
1261
1262                 break;
1263
1264         case MOUNT_UNMOUNTING:
1265         case MOUNT_UNMOUNTING_SIGKILL:
1266         case MOUNT_UNMOUNTING_SIGTERM:
1267
1268                 if (success)
1269                         mount_enter_dead(m, true);
1270                 else if (m->from_proc_self_mountinfo)
1271                         mount_enter_mounted(m, false);
1272                 else
1273                         mount_enter_dead(m, false);
1274                 break;
1275
1276         default:
1277                 assert_not_reached("Uh, control process died at wrong time.");
1278         }
1279
1280         /* Notify clients about changed exit status */
1281         unit_add_to_dbus_queue(u);
1282 }
1283
1284 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1285         Mount *m = MOUNT(u);
1286
1287         assert(m);
1288         assert(elapsed == 1);
1289         assert(w == &m->timer_watch);
1290
1291         switch (m->state) {
1292
1293         case MOUNT_MOUNTING:
1294         case MOUNT_MOUNTING_DONE:
1295                 log_warning("%s mounting timed out. Stopping.", u->id);
1296                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1297                 break;
1298
1299         case MOUNT_REMOUNTING:
1300                 log_warning("%s remounting timed out. Stopping.", u->id);
1301                 m->reload_failure = true;
1302                 mount_enter_mounted(m, true);
1303                 break;
1304
1305         case MOUNT_UNMOUNTING:
1306                 log_warning("%s unmounting timed out. Stopping.", u->id);
1307                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1308                 break;
1309
1310         case MOUNT_MOUNTING_SIGTERM:
1311                 if (m->exec_context.send_sigkill) {
1312                         log_warning("%s mounting timed out. Killing.", u->id);
1313                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1314                 } else {
1315                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->id);
1316
1317                         if (m->from_proc_self_mountinfo)
1318                                 mount_enter_mounted(m, false);
1319                         else
1320                                 mount_enter_dead(m, false);
1321                 }
1322                 break;
1323
1324         case MOUNT_REMOUNTING_SIGTERM:
1325                 if (m->exec_context.send_sigkill) {
1326                         log_warning("%s remounting timed out. Killing.", u->id);
1327                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1328                 } else {
1329                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->id);
1330
1331                         if (m->from_proc_self_mountinfo)
1332                                 mount_enter_mounted(m, false);
1333                         else
1334                                 mount_enter_dead(m, false);
1335                 }
1336                 break;
1337
1338         case MOUNT_UNMOUNTING_SIGTERM:
1339                 if (m->exec_context.send_sigkill) {
1340                         log_warning("%s unmounting timed out. Killing.", u->id);
1341                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1342                 } else {
1343                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->id);
1344
1345                         if (m->from_proc_self_mountinfo)
1346                                 mount_enter_mounted(m, false);
1347                         else
1348                                 mount_enter_dead(m, false);
1349                 }
1350                 break;
1351
1352         case MOUNT_MOUNTING_SIGKILL:
1353         case MOUNT_REMOUNTING_SIGKILL:
1354         case MOUNT_UNMOUNTING_SIGKILL:
1355                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->id);
1356
1357                 if (m->from_proc_self_mountinfo)
1358                         mount_enter_mounted(m, false);
1359                 else
1360                         mount_enter_dead(m, false);
1361                 break;
1362
1363         default:
1364                 assert_not_reached("Timeout at wrong time.");
1365         }
1366 }
1367
1368 static int mount_add_one(
1369                 Manager *m,
1370                 const char *what,
1371                 const char *where,
1372                 const char *options,
1373                 const char *fstype,
1374                 int passno,
1375                 bool from_proc_self_mountinfo,
1376                 bool set_flags) {
1377         int r;
1378         Unit *u;
1379         bool delete;
1380         char *e, *w = NULL, *o = NULL, *f = NULL;
1381         MountParameters *p;
1382
1383         assert(m);
1384         assert(what);
1385         assert(where);
1386         assert(options);
1387         assert(fstype);
1388
1389         assert(!set_flags || from_proc_self_mountinfo);
1390
1391         /* Ignore API mount points. They should never be referenced in
1392          * dependencies ever. */
1393         if (mount_point_is_api(where) || mount_point_ignore(where))
1394                 return 0;
1395
1396         if (streq(fstype, "autofs"))
1397                 return 0;
1398
1399         /* probably some kind of swap, ignore */
1400         if (!is_path(where))
1401                 return 0;
1402
1403         e = unit_name_from_path(where, ".mount");
1404         if (!e)
1405                 return -ENOMEM;
1406
1407         u = manager_get_unit(m, e);
1408         if (!u) {
1409                 delete = true;
1410
1411                 u = unit_new(m, sizeof(Mount));
1412                 if (!u) {
1413                         free(e);
1414                         return -ENOMEM;
1415                 }
1416
1417                 r = unit_add_name(u, e);
1418                 free(e);
1419
1420                 if (r < 0)
1421                         goto fail;
1422
1423                 MOUNT(u)->where = strdup(where);
1424                 if (!MOUNT(u)->where) {
1425                         r = -ENOMEM;
1426                         goto fail;
1427                 }
1428
1429                 unit_add_to_load_queue(u);
1430         } else {
1431                 delete = false;
1432                 free(e);
1433         }
1434
1435         if (!(w = strdup(what)) ||
1436             !(o = strdup(options)) ||
1437             !(f = strdup(fstype))) {
1438                 r = -ENOMEM;
1439                 goto fail;
1440         }
1441
1442         if (from_proc_self_mountinfo) {
1443                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1444
1445                 if (set_flags) {
1446                         MOUNT(u)->is_mounted = true;
1447                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1448                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1449                 }
1450
1451                 MOUNT(u)->from_proc_self_mountinfo = true;
1452         } else {
1453                 p = &MOUNT(u)->parameters_etc_fstab;
1454                 MOUNT(u)->from_etc_fstab = true;
1455         }
1456
1457         free(p->what);
1458         p->what = w;
1459
1460         free(p->options);
1461         p->options = o;
1462
1463         free(p->fstype);
1464         p->fstype = f;
1465
1466         p->passno = passno;
1467
1468         unit_add_to_dbus_queue(u);
1469
1470         return 0;
1471
1472 fail:
1473         free(w);
1474         free(o);
1475         free(f);
1476
1477         if (delete && u)
1478                 unit_free(u);
1479
1480         return r;
1481 }
1482
1483 static int mount_find_pri(char *options) {
1484         char *end, *pri;
1485         unsigned long r;
1486
1487         if (!(pri = mount_test_option(options, "pri")))
1488                 return 0;
1489
1490         pri += 4;
1491
1492         errno = 0;
1493         r = strtoul(pri, &end, 10);
1494
1495         if (errno != 0)
1496                 return -errno;
1497
1498         if (end == pri || (*end != ',' && *end != 0))
1499                 return -EINVAL;
1500
1501         return (int) r;
1502 }
1503
1504 static int mount_load_etc_fstab(Manager *m) {
1505         FILE *f;
1506         int r = 0;
1507         struct mntent* me;
1508
1509         assert(m);
1510
1511         errno = 0;
1512         if (!(f = setmntent("/etc/fstab", "r")))
1513                 return -errno;
1514
1515         while ((me = getmntent(f))) {
1516                 char *where, *what;
1517                 int k;
1518
1519                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1520                         r = -ENOMEM;
1521                         goto finish;
1522                 }
1523
1524                 if (!(where = strdup(me->mnt_dir))) {
1525                         free(what);
1526                         r = -ENOMEM;
1527                         goto finish;
1528                 }
1529
1530                 if (what[0] == '/')
1531                         path_kill_slashes(what);
1532
1533                 if (where[0] == '/')
1534                         path_kill_slashes(where);
1535
1536                 if (streq(me->mnt_type, "swap")) {
1537                         int pri;
1538
1539                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1540                                 k = pri;
1541                         else
1542                                 k = swap_add_one(m,
1543                                                  what,
1544                                                  NULL,
1545                                                  pri,
1546                                                  !!mount_test_option(me->mnt_opts, "noauto"),
1547                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1548                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1549                                                  false);
1550                 } else
1551                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1552
1553                 free(what);
1554                 free(where);
1555
1556                 if (r < 0)
1557                         r = k;
1558         }
1559
1560 finish:
1561
1562         endmntent(f);
1563         return r;
1564 }
1565
1566 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1567         int r = 0;
1568         unsigned i;
1569         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1570
1571         assert(m);
1572
1573         rewind(m->proc_self_mountinfo);
1574
1575         for (i = 1;; i++) {
1576                 int k;
1577
1578                 device = path = options = options2 = fstype = d = p = o = NULL;
1579
1580                 if ((k = fscanf(m->proc_self_mountinfo,
1581                                 "%*s "       /* (1) mount id */
1582                                 "%*s "       /* (2) parent id */
1583                                 "%*s "       /* (3) major:minor */
1584                                 "%*s "       /* (4) root */
1585                                 "%ms "       /* (5) mount point */
1586                                 "%ms"        /* (6) mount options */
1587                                 "%*[^-]"     /* (7) optional fields */
1588                                 "- "         /* (8) separator */
1589                                 "%ms "       /* (9) file system type */
1590                                 "%ms"        /* (10) mount source */
1591                                 "%ms"        /* (11) mount options 2 */
1592                                 "%*[^\n]",   /* some rubbish at the end */
1593                                 &path,
1594                                 &options,
1595                                 &fstype,
1596                                 &device,
1597                                 &options2)) != 5) {
1598
1599                         if (k == EOF)
1600                                 break;
1601
1602                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1603                         goto clean_up;
1604                 }
1605
1606                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1607                         r = -ENOMEM;
1608                         goto finish;
1609                 }
1610
1611                 if (!(d = cunescape(device)) ||
1612                     !(p = cunescape(path))) {
1613                         r = -ENOMEM;
1614                         goto finish;
1615                 }
1616
1617                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1618                         r = k;
1619
1620 clean_up:
1621                 free(device);
1622                 free(path);
1623                 free(options);
1624                 free(options2);
1625                 free(fstype);
1626                 free(d);
1627                 free(p);
1628                 free(o);
1629         }
1630
1631 finish:
1632         free(device);
1633         free(path);
1634         free(options);
1635         free(options2);
1636         free(fstype);
1637         free(d);
1638         free(p);
1639         free(o);
1640
1641         return r;
1642 }
1643
1644 static void mount_shutdown(Manager *m) {
1645         assert(m);
1646
1647         if (m->proc_self_mountinfo) {
1648                 fclose(m->proc_self_mountinfo);
1649                 m->proc_self_mountinfo = NULL;
1650         }
1651 }
1652
1653 static int mount_enumerate(Manager *m) {
1654         int r;
1655         struct epoll_event ev;
1656         assert(m);
1657
1658         if (!m->proc_self_mountinfo) {
1659                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1660                         return -errno;
1661
1662                 m->mount_watch.type = WATCH_MOUNT;
1663                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1664
1665                 zero(ev);
1666                 ev.events = EPOLLPRI;
1667                 ev.data.ptr = &m->mount_watch;
1668
1669                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1670                         return -errno;
1671         }
1672
1673         if ((r = mount_load_etc_fstab(m)) < 0)
1674                 goto fail;
1675
1676         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1677                 goto fail;
1678
1679         return 0;
1680
1681 fail:
1682         mount_shutdown(m);
1683         return r;
1684 }
1685
1686 void mount_fd_event(Manager *m, int events) {
1687         Unit *u;
1688         int r;
1689
1690         assert(m);
1691         assert(events & EPOLLPRI);
1692
1693         /* The manager calls this for every fd event happening on the
1694          * /proc/self/mountinfo file, which informs us about mounting
1695          * table changes */
1696
1697         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1698                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1699
1700                 /* Reset flags, just in case, for later calls */
1701                 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1702                         Mount *mount = MOUNT(u);
1703
1704                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1705                 }
1706
1707                 return;
1708         }
1709
1710         manager_dispatch_load_queue(m);
1711
1712         LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1713                 Mount *mount = MOUNT(u);
1714
1715                 if (!mount->is_mounted) {
1716                         /* This has just been unmounted. */
1717
1718                         mount->from_proc_self_mountinfo = false;
1719
1720                         switch (mount->state) {
1721
1722                         case MOUNT_MOUNTED:
1723                                 mount_enter_dead(mount, true);
1724                                 break;
1725
1726                         default:
1727                                 mount_set_state(mount, mount->state);
1728                                 break;
1729
1730                         }
1731
1732                 } else if (mount->just_mounted || mount->just_changed) {
1733
1734                         /* New or changed mount entry */
1735
1736                         switch (mount->state) {
1737
1738                         case MOUNT_DEAD:
1739                         case MOUNT_FAILED:
1740                                 mount_enter_mounted(mount, true);
1741                                 break;
1742
1743                         case MOUNT_MOUNTING:
1744                                 mount_enter_mounting_done(mount);
1745                                 break;
1746
1747                         default:
1748                                 /* Nothing really changed, but let's
1749                                  * issue an notification call
1750                                  * nonetheless, in case somebody is
1751                                  * waiting for this. (e.g. file system
1752                                  * ro/rw remounts.) */
1753                                 mount_set_state(mount, mount->state);
1754                                 break;
1755                         }
1756                 }
1757
1758                 /* Reset the flags for later calls */
1759                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1760         }
1761 }
1762
1763 static void mount_reset_failed(Unit *u) {
1764         Mount *m = MOUNT(u);
1765
1766         assert(m);
1767
1768         if (m->state == MOUNT_FAILED)
1769                 mount_set_state(m, MOUNT_DEAD);
1770
1771         m->failure = false;
1772 }
1773
1774 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1775         Mount *m = MOUNT(u);
1776         int r = 0;
1777         Set *pid_set = NULL;
1778
1779         assert(m);
1780
1781         if (who == KILL_MAIN) {
1782                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1783                 return -ESRCH;
1784         }
1785
1786         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1787                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1788                 return -ESRCH;
1789         }
1790
1791         if (who == KILL_CONTROL || who == KILL_ALL)
1792                 if (m->control_pid > 0)
1793                         if (kill(m->control_pid, signo) < 0)
1794                                 r = -errno;
1795
1796         if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
1797                 int q;
1798
1799                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1800                         return -ENOMEM;
1801
1802                 /* Exclude the control pid from being killed via the cgroup */
1803                 if (m->control_pid > 0)
1804                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1805                                 r = q;
1806                                 goto finish;
1807                         }
1808
1809                 if ((q = cgroup_bonding_kill_list(UNIT(m)->cgroup_bondings, signo, false, pid_set)) < 0)
1810                         if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
1811                                 r = q;
1812         }
1813
1814 finish:
1815         if (pid_set)
1816                 set_free(pid_set);
1817
1818         return r;
1819 }
1820
1821 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1822         [MOUNT_DEAD] = "dead",
1823         [MOUNT_MOUNTING] = "mounting",
1824         [MOUNT_MOUNTING_DONE] = "mounting-done",
1825         [MOUNT_MOUNTED] = "mounted",
1826         [MOUNT_REMOUNTING] = "remounting",
1827         [MOUNT_UNMOUNTING] = "unmounting",
1828         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1829         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1830         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1831         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1832         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1833         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1834         [MOUNT_FAILED] = "failed"
1835 };
1836
1837 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1838
1839 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1840         [MOUNT_EXEC_MOUNT] = "ExecMount",
1841         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1842         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1843 };
1844
1845 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1846
1847 const UnitVTable mount_vtable = {
1848         .suffix = ".mount",
1849         .object_size = sizeof(Mount),
1850         .sections =
1851                 "Unit\0"
1852                 "Mount\0"
1853                 "Install\0",
1854
1855         .no_alias = true,
1856         .no_instances = true,
1857         .show_status = true,
1858
1859         .init = mount_init,
1860         .load = mount_load,
1861         .done = mount_done,
1862
1863         .coldplug = mount_coldplug,
1864
1865         .dump = mount_dump,
1866
1867         .start = mount_start,
1868         .stop = mount_stop,
1869         .reload = mount_reload,
1870
1871         .kill = mount_kill,
1872
1873         .serialize = mount_serialize,
1874         .deserialize_item = mount_deserialize_item,
1875
1876         .active_state = mount_active_state,
1877         .sub_state_to_string = mount_sub_state_to_string,
1878
1879         .check_gc = mount_check_gc,
1880
1881         .sigchld_event = mount_sigchld_event,
1882         .timer_event = mount_timer_event,
1883
1884         .reset_failed = mount_reset_failed,
1885
1886         .bus_interface = "org.freedesktop.systemd1.Mount",
1887         .bus_message_handler = bus_mount_message_handler,
1888         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1889
1890         .enumerate = mount_enumerate,
1891         .shutdown = mount_shutdown
1892 };