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->meta.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 = EXEC_OUTPUT_KMSG;
  73
  74         /* We need to make sure that /bin/mount is always called in
  75          * the same process group as us, so that the autofs kernel
  76          * side doesn't send us another mount request while we are
  77          * already trying to comply its last one. */
  78         m->exec_context.same_pgrp = true;
  79
  80         m->timer_watch.type = WATCH_INVALID;
  81
  82         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  83
  84         m->meta.ignore_on_isolate = true;
  85 }
  86
  87 static void mount_unwatch_control_pid(Mount *m) {
  88         assert(m);
  89
  90         if (m->control_pid <= 0)
  91                 return;
  92
  93         unit_unwatch_pid(UNIT(m), m->control_pid);
  94         m->control_pid = 0;
  95 }
  96
  97 static void mount_parameters_done(MountParameters *p) {
  98         assert(p);
  99
 100         free(p->what);
 101         free(p->options);
 102         free(p->fstype);
 103
 104         p->what = p->options = p->fstype = NULL;
 105 }
 106
 107 static void mount_done(Unit *u) {
 108         Mount *m = MOUNT(u);
 109         Meta *other;
 110
 111         assert(m);
 112
 113         free(m->where);
 114         m->where = NULL;
 115
 116         /* Try to detach us from the automount unit if there is any */
 117         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_AUTOMOUNT]) {
 118                 Automount *a = (Automount*) other;
 119
 120                 if (a->mount == m)
 121                         a->mount = NULL;
 122         }
 123
 124         mount_parameters_done(&m->parameters_etc_fstab);
 125         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 126         mount_parameters_done(&m->parameters_fragment);
 127
 128         exec_context_done(&m->exec_context);
 129         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 130         m->control_command = NULL;
 131
 132         mount_unwatch_control_pid(m);
 133
 134         unit_unwatch_timer(u, &m->timer_watch);
 135 }
 136
 137 static MountParameters* get_mount_parameters_configured(Mount *m) {
 138         assert(m);
 139
 140         if (m->from_fragment)
 141                 return &m->parameters_fragment;
 142         else if (m->from_etc_fstab)
 143                 return &m->parameters_etc_fstab;
 144
 145         return NULL;
 146 }
 147
 148 static MountParameters* get_mount_parameters(Mount *m) {
 149         assert(m);
 150
 151         if (m->from_proc_self_mountinfo)
 152                 return &m->parameters_proc_self_mountinfo;
 153
 154         return get_mount_parameters_configured(m);
 155 }
 156
 157 static int mount_add_mount_links(Mount *m) {
 158         Meta *other;
 159         int r;
 160         MountParameters *pm;
 161
 162         assert(m);
 163
 164         pm = get_mount_parameters_configured(m);
 165
 166         /* Adds in links to other mount points that might lie below or
 167          * above us in the hierarchy */
 168
 169         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_MOUNT]) {
 170                 Mount *n = (Mount*) other;
 171                 MountParameters *pn;
 172
 173                 if (n == m)
 174                         continue;
 175
 176                 if (n->meta.load_state != UNIT_LOADED)
 177                         continue;
 178
 179                 pn = get_mount_parameters_configured(n);
 180
 181                 if (path_startswith(m->where, n->where)) {
 182
 183                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 184                                 return r;
 185
 186                         if (pn)
 187                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 188                                         return r;
 189
 190                 } else if (path_startswith(n->where, m->where)) {
 191
 192                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 193                                 return r;
 194
 195                         if (pm)
 196                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 197                                         return r;
 198
 199                 } else if (pm && path_startswith(pm->what, n->where)) {
 200
 201                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 202                                 return r;
 203
 204                         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 205                                 return r;
 206
 207                 } else if (pn && path_startswith(pn->what, m->where)) {
 208
 209                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 210                                 return r;
 211
 212                         if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 213                                 return r;
 214                 }
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int mount_add_swap_links(Mount *m) {
 221         Meta *other;
 222         int r;
 223
 224         assert(m);
 225
 226         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SWAP])
 227                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 228                         return r;
 229
 230         return 0;
 231 }
 232
 233 static int mount_add_path_links(Mount *m) {
 234         Meta *other;
 235         int r;
 236
 237         assert(m);
 238
 239         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_PATH])
 240                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 241                         return r;
 242
 243         return 0;
 244 }
 245
 246 static int mount_add_automount_links(Mount *m) {
 247         Meta *other;
 248         int r;
 249
 250         assert(m);
 251
 252         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_AUTOMOUNT])
 253                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 254                         return r;
 255
 256         return 0;
 257 }
 258
 259 static int mount_add_socket_links(Mount *m) {
 260         Meta *other;
 261         int r;
 262
 263         assert(m);
 264
 265         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SOCKET])
 266                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 267                         return r;
 268
 269         return 0;
 270 }
 271
 272 static char* mount_test_option(const char *haystack, const char *needle) {
 273         struct mntent me;
 274
 275         assert(needle);
 276
 277         /* Like glibc's hasmntopt(), but works on a string, not a
 278          * struct mntent */
 279
 280         if (!haystack)
 281                 return false;
 282
 283         zero(me);
 284         me.mnt_opts = (char*) haystack;
 285
 286         return hasmntopt(&me, needle);
 287 }
 288
 289 static bool mount_is_network(MountParameters *p) {
 290         assert(p);
 291
 292         if (mount_test_option(p->options, "_netdev"))
 293                 return true;
 294
 295         if (p->fstype && fstype_is_network(p->fstype))
 296                 return true;
 297
 298         return false;
 299 }
 300
 301 static bool mount_is_bind(MountParameters *p) {
 302         assert(p);
 303
 304         if (mount_test_option(p->options, "bind"))
 305                 return true;
 306
 307         if (p->fstype && streq(p->fstype, "bind"))
 308                 return true;
 309
 310         return false;
 311 }
 312
 313 static bool needs_quota(MountParameters *p) {
 314         assert(p);
 315
 316         if (mount_is_network(p))
 317                 return false;
 318
 319         if (mount_is_bind(p))
 320                 return false;
 321
 322         return mount_test_option(p->options, "usrquota") ||
 323                 mount_test_option(p->options, "grpquota") ||
 324                 mount_test_option(p->options, "quota") ||
 325                 mount_test_option(p->options, "usrjquota") ||
 326                 mount_test_option(p->options, "grpjquota");
 327 }
 328
 329 static int mount_add_fstab_links(Mount *m) {
 330         const char *target, *after = NULL, *after2 = NULL;
 331         MountParameters *p;
 332         Unit *tu;
 333         int r;
 334         bool noauto, nofail, handle, automount;
 335
 336         assert(m);
 337
 338         if (m->meta.manager->running_as != MANAGER_SYSTEM)
 339                 return 0;
 340
 341         if (!(p = get_mount_parameters_configured(m)))
 342                 return 0;
 343
 344         if (p != &m->parameters_etc_fstab)
 345                 return 0;
 346
 347         noauto = !!mount_test_option(p->options, "noauto");
 348         nofail = !!mount_test_option(p->options, "nofail");
 349         automount =
 350                 mount_test_option(p->options, "comment=systemd.automount") ||
 351                 mount_test_option(p->options, "x-systemd-automount");
 352         handle =
 353                 automount ||
 354                 mount_test_option(p->options, "comment=systemd.mount") ||
 355                 mount_test_option(p->options, "x-systemd-mount") ||
 356                 m->meta.manager->mount_auto;
 357
 358         if (mount_is_network(p)) {
 359                 target = SPECIAL_REMOTE_FS_TARGET;
 360                 after = SPECIAL_REMOTE_FS_PRE_TARGET;
 361                 after2 = SPECIAL_NETWORK_TARGET;
 362         } else {
 363                 target = SPECIAL_LOCAL_FS_TARGET;
 364                 after = SPECIAL_LOCAL_FS_PRE_TARGET;
 365         }
 366
 367         if (!path_equal(m->where, "/"))
 368                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 369                         return r;
 370
 371         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 372                 return r;
 373
 374         if (after)
 375                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0)
 376                         return r;
 377
 378         if (after2)
 379                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after2, NULL, true)) < 0)
 380                         return r;
 381
 382         if (automount) {
 383                 Unit *am;
 384
 385                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 386                         return r;
 387
 388                 /* If auto is configured as well also pull in the
 389                  * mount right-away, but don't rely on it. */
 390                 if (!noauto) /* automount + auto */
 391                         if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 392                                 return r;
 393
 394                 /* Install automount unit */
 395                 if (!nofail) /* automount + fail */
 396                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(am), true);
 397                 else /* automount + nofail */
 398                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 399
 400         } else if (handle && !noauto) {
 401
 402                 /* Automatically add mount points that aren't natively
 403                  * configured to local-fs.target */
 404
 405                 if (!nofail) /* auto + fail */
 406                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
 407                 else /* auto + nofail */
 408                         return unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true);
 409         }
 410
 411         return 0;
 412 }
 413
 414 static int mount_add_device_links(Mount *m) {
 415         MountParameters *p;
 416         int r;
 417
 418         assert(m);
 419
 420         if (!(p = get_mount_parameters_configured(m)))
 421                 return 0;
 422
 423         if (!p->what)
 424                 return 0;
 425
 426         if (!mount_is_bind(p) &&
 427             !path_equal(m->where, "/") &&
 428             p == &m->parameters_etc_fstab) {
 429                 bool nofail, noauto;
 430
 431                 noauto = !!mount_test_option(p->options, "noauto");
 432                 nofail = !!mount_test_option(p->options, "nofail");
 433
 434                 if ((r = unit_add_node_link(UNIT(m), p->what,
 435                                             !noauto && nofail &&
 436                                             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
 437                         return r;
 438         }
 439
 440         if (p->passno > 0 &&
 441             !mount_is_bind(p) &&
 442             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
 443             !path_equal(m->where, "/")) {
 444                 char *name;
 445                 Unit *fsck;
 446                 /* Let's add in the fsck service */
 447
 448                 /* aka SPECIAL_FSCK_SERVICE */
 449                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 450                         return -ENOMEM;
 451
 452                 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
 453                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 454                         free(name);
 455                         return r;
 456                 }
 457
 458                 free(name);
 459
 460                 SERVICE(fsck)->fsck_passno = p->passno;
 461
 462                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 463                         return r;
 464         }
 465
 466         return 0;
 467 }
 468
 469 static int mount_add_default_dependencies(Mount *m) {
 470         int r;
 471
 472         assert(m);
 473
 474         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 475             !path_equal(m->where, "/")) {
 476                 MountParameters *p;
 477
 478                 p = get_mount_parameters_configured(m);
 479
 480                 if (p && needs_quota(p)) {
 481                         if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
 482                             (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
 483                                 return r;
 484                 }
 485
 486                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 487                         return r;
 488         }
 489
 490         return 0;
 491 }
 492
 493 static int mount_fix_timeouts(Mount *m) {
 494         MountParameters *p;
 495         const char *timeout = NULL;
 496         Unit *other;
 497         Iterator i;
 498         usec_t u;
 499         char *t;
 500         int r;
 501
 502         assert(m);
 503
 504         if (!(p = get_mount_parameters_configured(m)))
 505                 return 0;
 506
 507         /* Allow configuration how long we wait for a device that
 508          * backs a mount point to show up. This is useful to support
 509          * endless device timeouts for devices that show up only after
 510          * user input, like crypto devices. */
 511
 512         if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
 513                 timeout += 31;
 514         else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
 515                 timeout += 25;
 516         else
 517                 return 0;
 518
 519         t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
 520         if (!t)
 521                 return -ENOMEM;
 522
 523         r = parse_usec(t, &u);
 524         free(t);
 525
 526         if (r < 0) {
 527                 log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
 528                 return r;
 529         }
 530
 531         SET_FOREACH(other, m->meta.dependencies[UNIT_AFTER], i) {
 532                 if (other->meta.type != UNIT_DEVICE)
 533                         continue;
 534
 535                 other->meta.job_timeout = u;
 536         }
 537
 538         return 0;
 539 }
 540
 541 static int mount_verify(Mount *m) {
 542         bool b;
 543         char *e;
 544         assert(m);
 545
 546         if (m->meta.load_state != UNIT_LOADED)
 547                 return 0;
 548
 549         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 550                 return -ENOENT;
 551
 552         if (!(e = unit_name_from_path(m->where, ".mount")))
 553                 return -ENOMEM;
 554
 555         b = unit_has_name(UNIT(m), e);
 556         free(e);
 557
 558         if (!b) {
 559                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 560                 return -EINVAL;
 561         }
 562
 563         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 564                 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
 565                 return -EINVAL;
 566         }
 567
 568         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 569                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 570                 return -EBADMSG;
 571         }
 572
 573         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 574                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 575                 return -EINVAL;
 576         }
 577
 578         return 0;
 579 }
 580
 581 static int mount_load(Unit *u) {
 582         Mount *m = MOUNT(u);
 583         int r;
 584
 585         assert(u);
 586         assert(u->meta.load_state == UNIT_STUB);
 587
 588         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 589                 return r;
 590
 591         /* This is a new unit? Then let's add in some extras */
 592         if (u->meta.load_state == UNIT_LOADED) {
 593                 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
 594                         return r;
 595
 596                 if (m->meta.fragment_path)
 597                         m->from_fragment = true;
 598                 else if (m->from_etc_fstab)
 599                         m->meta.default_dependencies = false;
 600
 601                 if (!m->where)
 602                         if (!(m->where = unit_name_to_path(u->meta.id)))
 603                                 return -ENOMEM;
 604
 605                 path_kill_slashes(m->where);
 606
 607                 if (!m->meta.description)
 608                         if ((r = unit_set_description(u, m->where)) < 0)
 609                                 return r;
 610
 611                 if ((r = mount_add_device_links(m)) < 0)
 612                         return r;
 613
 614                 if ((r = mount_add_mount_links(m)) < 0)
 615                         return r;
 616
 617                 if ((r = mount_add_socket_links(m)) < 0)
 618                         return r;
 619
 620                 if ((r = mount_add_swap_links(m)) < 0)
 621                         return r;
 622
 623                 if ((r = mount_add_path_links(m)) < 0)
 624                         return r;
 625
 626                 if ((r = mount_add_automount_links(m)) < 0)
 627                         return r;
 628
 629                 if ((r = mount_add_fstab_links(m)) < 0)
 630                         return r;
 631
 632                 if (m->meta.default_dependencies)
 633                         if ((r = mount_add_default_dependencies(m)) < 0)
 634                                 return r;
 635
 636                 if ((r = unit_add_default_cgroups(u)) < 0)
 637                         return r;
 638
 639                 mount_fix_timeouts(m);
 640         }
 641
 642         return mount_verify(m);
 643 }
 644
 645 static int mount_notify_automount(Mount *m, int status) {
 646         Unit *p;
 647         int r;
 648
 649         assert(m);
 650
 651         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 652                 return r == -ENOENT ? 0 : r;
 653
 654         return automount_send_ready(AUTOMOUNT(p), status);
 655 }
 656
 657 static void mount_set_state(Mount *m, MountState state) {
 658         MountState old_state;
 659         assert(m);
 660
 661         old_state = m->state;
 662         m->state = state;
 663
 664         if (state != MOUNT_MOUNTING &&
 665             state != MOUNT_MOUNTING_DONE &&
 666             state != MOUNT_REMOUNTING &&
 667             state != MOUNT_UNMOUNTING &&
 668             state != MOUNT_MOUNTING_SIGTERM &&
 669             state != MOUNT_MOUNTING_SIGKILL &&
 670             state != MOUNT_UNMOUNTING_SIGTERM &&
 671             state != MOUNT_UNMOUNTING_SIGKILL &&
 672             state != MOUNT_REMOUNTING_SIGTERM &&
 673             state != MOUNT_REMOUNTING_SIGKILL) {
 674                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 675                 mount_unwatch_control_pid(m);
 676                 m->control_command = NULL;
 677                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 678         }
 679
 680         if (state == MOUNT_MOUNTED ||
 681             state == MOUNT_REMOUNTING)
 682                 mount_notify_automount(m, 0);
 683         else if (state == MOUNT_DEAD ||
 684                  state == MOUNT_UNMOUNTING ||
 685                  state == MOUNT_MOUNTING_SIGTERM ||
 686                  state == MOUNT_MOUNTING_SIGKILL ||
 687                  state == MOUNT_REMOUNTING_SIGTERM ||
 688                  state == MOUNT_REMOUNTING_SIGKILL ||
 689                  state == MOUNT_UNMOUNTING_SIGTERM ||
 690                  state == MOUNT_UNMOUNTING_SIGKILL ||
 691                  state == MOUNT_FAILED)
 692                 mount_notify_automount(m, -ENODEV);
 693
 694         if (state != old_state)
 695                 log_debug("%s changed %s -> %s",
 696                           m->meta.id,
 697                           mount_state_to_string(old_state),
 698                           mount_state_to_string(state));
 699
 700         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], !m->reload_failure);
 701         m->reload_failure = false;
 702 }
 703
 704 static int mount_coldplug(Unit *u) {
 705         Mount *m = MOUNT(u);
 706         MountState new_state = MOUNT_DEAD;
 707         int r;
 708
 709         assert(m);
 710         assert(m->state == MOUNT_DEAD);
 711
 712         if (m->deserialized_state != m->state)
 713                 new_state = m->deserialized_state;
 714         else if (m->from_proc_self_mountinfo)
 715                 new_state = MOUNT_MOUNTED;
 716
 717         if (new_state != m->state) {
 718
 719                 if (new_state == MOUNT_MOUNTING ||
 720                     new_state == MOUNT_MOUNTING_DONE ||
 721                     new_state == MOUNT_REMOUNTING ||
 722                     new_state == MOUNT_UNMOUNTING ||
 723                     new_state == MOUNT_MOUNTING_SIGTERM ||
 724                     new_state == MOUNT_MOUNTING_SIGKILL ||
 725                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 726                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 727                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 728                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 729
 730                         if (m->control_pid <= 0)
 731                                 return -EBADMSG;
 732
 733                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 734                                 return r;
 735
 736                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 737                                 return r;
 738                 }
 739
 740                 mount_set_state(m, new_state);
 741         }
 742
 743         return 0;
 744 }
 745
 746 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 747         Mount *m = MOUNT(u);
 748         MountParameters *p;
 749
 750         assert(m);
 751         assert(f);
 752
 753         p = get_mount_parameters(m);
 754
 755         fprintf(f,
 756                 "%sMount State: %s\n"
 757                 "%sWhere: %s\n"
 758                 "%sWhat: %s\n"
 759                 "%sFile System Type: %s\n"
 760                 "%sOptions: %s\n"
 761                 "%sFrom /etc/fstab: %s\n"
 762                 "%sFrom /proc/self/mountinfo: %s\n"
 763                 "%sFrom fragment: %s\n"
 764                 "%sDirectoryMode: %04o\n",
 765                 prefix, mount_state_to_string(m->state),
 766                 prefix, m->where,
 767                 prefix, strna(p->what),
 768                 prefix, strna(p->fstype),
 769                 prefix, strna(p->options),
 770                 prefix, yes_no(m->from_etc_fstab),
 771                 prefix, yes_no(m->from_proc_self_mountinfo),
 772                 prefix, yes_no(m->from_fragment),
 773                 prefix, m->directory_mode);
 774
 775         if (m->control_pid > 0)
 776                 fprintf(f,
 777                         "%sControl PID: %lu\n",
 778                         prefix, (unsigned long) m->control_pid);
 779
 780         exec_context_dump(&m->exec_context, f, prefix);
 781 }
 782
 783 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 784         pid_t pid;
 785         int r;
 786
 787         assert(m);
 788         assert(c);
 789         assert(_pid);
 790
 791         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 792                 goto fail;
 793
 794         if ((r = exec_spawn(c,
 795                             NULL,
 796                             &m->exec_context,
 797                             NULL, 0,
 798                             m->meta.manager->environment,
 799                             true,
 800                             true,
 801                             true,
 802                             m->meta.manager->confirm_spawn,
 803                             m->meta.cgroup_bondings,
 804                             m->meta.cgroup_attributes,
 805                             &pid)) < 0)
 806                 goto fail;
 807
 808         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 809                 /* FIXME: we need to do something here */
 810                 goto fail;
 811
 812         *_pid = pid;
 813
 814         return 0;
 815
 816 fail:
 817         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 818
 819         return r;
 820 }
 821
 822 static void mount_enter_dead(Mount *m, bool success) {
 823         assert(m);
 824
 825         if (!success)
 826                 m->failure = true;
 827
 828         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 829 }
 830
 831 static void mount_enter_mounted(Mount *m, bool success) {
 832         assert(m);
 833
 834         if (!success)
 835                 m->failure = true;
 836
 837         mount_set_state(m, MOUNT_MOUNTED);
 838 }
 839
 840 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 841         int r;
 842         Set *pid_set = NULL;
 843         bool wait_for_exit = false;
 844
 845         assert(m);
 846
 847         if (!success)
 848                 m->failure = true;
 849
 850         if (m->exec_context.kill_mode != KILL_NONE) {
 851                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 852                            state == MOUNT_UNMOUNTING_SIGTERM ||
 853                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 854
 855                 if (m->control_pid > 0) {
 856                         if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
 857
 858                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 859                         else
 860                                 wait_for_exit = true;
 861                 }
 862
 863                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 864
 865                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 866                                 r = -ENOMEM;
 867                                 goto fail;
 868                         }
 869
 870                         /* Exclude the control pid from being killed via the cgroup */
 871                         if (m->control_pid > 0)
 872                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 873                                         goto fail;
 874
 875                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
 876                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 877                                         log_warning("Failed to kill control group: %s", strerror(-r));
 878                         } else if (r > 0)
 879                                 wait_for_exit = true;
 880
 881                         set_free(pid_set);
 882                         pid_set = NULL;
 883                 }
 884         }
 885
 886         if (wait_for_exit) {
 887                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 888                         goto fail;
 889
 890                 mount_set_state(m, state);
 891         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 892                 mount_enter_mounted(m, true);
 893         else
 894                 mount_enter_dead(m, true);
 895
 896         return;
 897
 898 fail:
 899         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 900
 901         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 902                 mount_enter_mounted(m, false);
 903         else
 904                 mount_enter_dead(m, false);
 905
 906         if (pid_set)
 907                 set_free(pid_set);
 908 }
 909
 910 static void mount_enter_unmounting(Mount *m, bool success) {
 911         int r;
 912
 913         assert(m);
 914
 915         if (!success)
 916                 m->failure = true;
 917
 918         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 919         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 920
 921         if ((r = exec_command_set(
 922                              m->control_command,
 923                              "/bin/umount",
 924                              m->where,
 925                              NULL)) < 0)
 926                 goto fail;
 927
 928         mount_unwatch_control_pid(m);
 929
 930         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 931                 goto fail;
 932
 933         mount_set_state(m, MOUNT_UNMOUNTING);
 934
 935         return;
 936
 937 fail:
 938         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 939         mount_enter_mounted(m, false);
 940 }
 941
 942 static void mount_enter_mounting(Mount *m) {
 943         int r;
 944         MountParameters *p;
 945
 946         assert(m);
 947
 948         m->control_command_id = MOUNT_EXEC_MOUNT;
 949         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 950
 951         mkdir_p(m->where, m->directory_mode);
 952
 953         /* Create the source directory for bind-mounts if needed */
 954         p = get_mount_parameters_configured(m);
 955         if (p && mount_is_bind(p))
 956                 mkdir_p(p->what, m->directory_mode);
 957
 958         if (m->from_fragment)
 959                 r = exec_command_set(
 960                                 m->control_command,
 961                                 "/bin/mount",
 962                                 m->parameters_fragment.what,
 963                                 m->where,
 964                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 965                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 966                                 NULL);
 967         else if (m->from_etc_fstab)
 968                 r = exec_command_set(
 969                                 m->control_command,
 970                                 "/bin/mount",
 971                                 m->where,
 972                                 NULL);
 973         else
 974                 r = -ENOENT;
 975
 976         if (r < 0)
 977                 goto fail;
 978
 979         mount_unwatch_control_pid(m);
 980
 981         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 982                 goto fail;
 983
 984         mount_set_state(m, MOUNT_MOUNTING);
 985
 986         return;
 987
 988 fail:
 989         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 990         mount_enter_dead(m, false);
 991 }
 992
 993 static void mount_enter_mounting_done(Mount *m) {
 994         assert(m);
 995
 996         mount_set_state(m, MOUNT_MOUNTING_DONE);
 997 }
 998
 999 static void mount_enter_remounting(Mount *m, bool success) {
1000         int r;
1001
1002         assert(m);
1003
1004         if (!success)
1005                 m->failure = true;
1006
1007         m->control_command_id = MOUNT_EXEC_REMOUNT;
1008         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1009
1010         if (m->from_fragment) {
1011                 char *buf = NULL;
1012                 const char *o;
1013
1014                 if (m->parameters_fragment.options) {
1015                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
1016                                 r = -ENOMEM;
1017                                 goto fail;
1018                         }
1019
1020                         o = buf;
1021                 } else
1022                         o = "remount";
1023
1024                 r = exec_command_set(
1025                                 m->control_command,
1026                                 "/bin/mount",
1027                                 m->parameters_fragment.what,
1028                                 m->where,
1029                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
1030                                 "-o", o,
1031                                 NULL);
1032
1033                 free(buf);
1034         } else if (m->from_etc_fstab)
1035                 r = exec_command_set(
1036                                 m->control_command,
1037                                 "/bin/mount",
1038                                 m->where,
1039                                 "-o", "remount",
1040                                 NULL);
1041         else
1042                 r = -ENOENT;
1043
1044         if (r < 0)
1045                 goto fail;
1046
1047         mount_unwatch_control_pid(m);
1048
1049         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
1050                 goto fail;
1051
1052         mount_set_state(m, MOUNT_REMOUNTING);
1053
1054         return;
1055
1056 fail:
1057         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
1058         m->reload_failure = true;
1059         mount_enter_mounted(m, true);
1060 }
1061
1062 static int mount_start(Unit *u) {
1063         Mount *m = MOUNT(u);
1064
1065         assert(m);
1066
1067         /* We cannot fulfill this request right now, try again later
1068          * please! */
1069         if (m->state == MOUNT_UNMOUNTING ||
1070             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1071             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1072             m->state == MOUNT_MOUNTING_SIGTERM ||
1073             m->state == MOUNT_MOUNTING_SIGKILL)
1074                 return -EAGAIN;
1075
1076         /* Already on it! */
1077         if (m->state == MOUNT_MOUNTING)
1078                 return 0;
1079
1080         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1081
1082         m->failure = false;
1083         mount_enter_mounting(m);
1084         return 0;
1085 }
1086
1087 static int mount_stop(Unit *u) {
1088         Mount *m = MOUNT(u);
1089
1090         assert(m);
1091
1092         /* Already on it */
1093         if (m->state == MOUNT_UNMOUNTING ||
1094             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1095             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1096             m->state == MOUNT_MOUNTING_SIGTERM ||
1097             m->state == MOUNT_MOUNTING_SIGKILL)
1098                 return 0;
1099
1100         assert(m->state == MOUNT_MOUNTING ||
1101                m->state == MOUNT_MOUNTING_DONE ||
1102                m->state == MOUNT_MOUNTED ||
1103                m->state == MOUNT_REMOUNTING ||
1104                m->state == MOUNT_REMOUNTING_SIGTERM ||
1105                m->state == MOUNT_REMOUNTING_SIGKILL);
1106
1107         mount_enter_unmounting(m, true);
1108         return 0;
1109 }
1110
1111 static int mount_reload(Unit *u) {
1112         Mount *m = MOUNT(u);
1113
1114         assert(m);
1115
1116         if (m->state == MOUNT_MOUNTING_DONE)
1117                 return -EAGAIN;
1118
1119         assert(m->state == MOUNT_MOUNTED);
1120
1121         mount_enter_remounting(m, true);
1122         return 0;
1123 }
1124
1125 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1126         Mount *m = MOUNT(u);
1127
1128         assert(m);
1129         assert(f);
1130         assert(fds);
1131
1132         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1133         unit_serialize_item(u, f, "failure", yes_no(m->failure));
1134
1135         if (m->control_pid > 0)
1136                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1137
1138         if (m->control_command_id >= 0)
1139                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1140
1141         return 0;
1142 }
1143
1144 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1145         Mount *m = MOUNT(u);
1146
1147         assert(u);
1148         assert(key);
1149         assert(value);
1150         assert(fds);
1151
1152         if (streq(key, "state")) {
1153                 MountState state;
1154
1155                 if ((state = mount_state_from_string(value)) < 0)
1156                         log_debug("Failed to parse state value %s", value);
1157                 else
1158                         m->deserialized_state = state;
1159         } else if (streq(key, "failure")) {
1160                 int b;
1161
1162                 if ((b = parse_boolean(value)) < 0)
1163                         log_debug("Failed to parse failure value %s", value);
1164                 else
1165                         m->failure = b || m->failure;
1166
1167         } else if (streq(key, "control-pid")) {
1168                 pid_t pid;
1169
1170                 if (parse_pid(value, &pid) < 0)
1171                         log_debug("Failed to parse control-pid value %s", value);
1172                 else
1173                         m->control_pid = pid;
1174         } else if (streq(key, "control-command")) {
1175                 MountExecCommand id;
1176
1177                 if ((id = mount_exec_command_from_string(value)) < 0)
1178                         log_debug("Failed to parse exec-command value %s", value);
1179                 else {
1180                         m->control_command_id = id;
1181                         m->control_command = m->exec_command + id;
1182                 }
1183
1184         } else
1185                 log_debug("Unknown serialization key '%s'", key);
1186
1187         return 0;
1188 }
1189
1190 static UnitActiveState mount_active_state(Unit *u) {
1191         assert(u);
1192
1193         return state_translation_table[MOUNT(u)->state];
1194 }
1195
1196 static const char *mount_sub_state_to_string(Unit *u) {
1197         assert(u);
1198
1199         return mount_state_to_string(MOUNT(u)->state);
1200 }
1201
1202 static bool mount_check_gc(Unit *u) {
1203         Mount *m = MOUNT(u);
1204
1205         assert(m);
1206
1207         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1208 }
1209
1210 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1211         Mount *m = MOUNT(u);
1212         bool success;
1213
1214         assert(m);
1215         assert(pid >= 0);
1216
1217         if (pid != m->control_pid)
1218                 return;
1219
1220         m->control_pid = 0;
1221
1222         success = is_clean_exit(code, status);
1223         m->failure = m->failure || !success;
1224
1225         if (m->control_command) {
1226                 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1227                 m->control_command = NULL;
1228                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1229         }
1230
1231         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1232                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1233
1234         /* Note that mount(8) returning and the kernel sending us a
1235          * mount table change event might happen out-of-order. If an
1236          * operation succeed we assume the kernel will follow soon too
1237          * and already change into the resulting state.  If it fails
1238          * we check if the kernel still knows about the mount. and
1239          * change state accordingly. */
1240
1241         switch (m->state) {
1242
1243         case MOUNT_MOUNTING:
1244         case MOUNT_MOUNTING_DONE:
1245         case MOUNT_MOUNTING_SIGKILL:
1246         case MOUNT_MOUNTING_SIGTERM:
1247
1248                 if (success)
1249                         mount_enter_mounted(m, true);
1250                 else if (m->from_proc_self_mountinfo)
1251                         mount_enter_mounted(m, false);
1252                 else
1253                         mount_enter_dead(m, false);
1254                 break;
1255
1256         case MOUNT_REMOUNTING:
1257         case MOUNT_REMOUNTING_SIGKILL:
1258         case MOUNT_REMOUNTING_SIGTERM:
1259
1260                 m->reload_failure = !success;
1261                 if (m->from_proc_self_mountinfo)
1262                         mount_enter_mounted(m, true);
1263                 else
1264                         mount_enter_dead(m, true);
1265
1266                 break;
1267
1268         case MOUNT_UNMOUNTING:
1269         case MOUNT_UNMOUNTING_SIGKILL:
1270         case MOUNT_UNMOUNTING_SIGTERM:
1271
1272                 if (success)
1273                         mount_enter_dead(m, true);
1274                 else if (m->from_proc_self_mountinfo)
1275                         mount_enter_mounted(m, false);
1276                 else
1277                         mount_enter_dead(m, false);
1278                 break;
1279
1280         default:
1281                 assert_not_reached("Uh, control process died at wrong time.");
1282         }
1283
1284         /* Notify clients about changed exit status */
1285         unit_add_to_dbus_queue(u);
1286 }
1287
1288 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1289         Mount *m = MOUNT(u);
1290
1291         assert(m);
1292         assert(elapsed == 1);
1293         assert(w == &m->timer_watch);
1294
1295         switch (m->state) {
1296
1297         case MOUNT_MOUNTING:
1298         case MOUNT_MOUNTING_DONE:
1299                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1300                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1301                 break;
1302
1303         case MOUNT_REMOUNTING:
1304                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1305                 m->reload_failure = true;
1306                 mount_enter_mounted(m, true);
1307                 break;
1308
1309         case MOUNT_UNMOUNTING:
1310                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1311                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1312                 break;
1313
1314         case MOUNT_MOUNTING_SIGTERM:
1315                 if (m->exec_context.send_sigkill) {
1316                         log_warning("%s mounting timed out. Killing.", u->meta.id);
1317                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1318                 } else {
1319                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1320
1321                         if (m->from_proc_self_mountinfo)
1322                                 mount_enter_mounted(m, false);
1323                         else
1324                                 mount_enter_dead(m, false);
1325                 }
1326                 break;
1327
1328         case MOUNT_REMOUNTING_SIGTERM:
1329                 if (m->exec_context.send_sigkill) {
1330                         log_warning("%s remounting timed out. Killing.", u->meta.id);
1331                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1332                 } else {
1333                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1334
1335                         if (m->from_proc_self_mountinfo)
1336                                 mount_enter_mounted(m, false);
1337                         else
1338                                 mount_enter_dead(m, false);
1339                 }
1340                 break;
1341
1342         case MOUNT_UNMOUNTING_SIGTERM:
1343                 if (m->exec_context.send_sigkill) {
1344                         log_warning("%s unmounting timed out. Killing.", u->meta.id);
1345                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1346                 } else {
1347                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1348
1349                         if (m->from_proc_self_mountinfo)
1350                                 mount_enter_mounted(m, false);
1351                         else
1352                                 mount_enter_dead(m, false);
1353                 }
1354                 break;
1355
1356         case MOUNT_MOUNTING_SIGKILL:
1357         case MOUNT_REMOUNTING_SIGKILL:
1358         case MOUNT_UNMOUNTING_SIGKILL:
1359                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1360
1361                 if (m->from_proc_self_mountinfo)
1362                         mount_enter_mounted(m, false);
1363                 else
1364                         mount_enter_dead(m, false);
1365                 break;
1366
1367         default:
1368                 assert_not_reached("Timeout at wrong time.");
1369         }
1370 }
1371
1372 static int mount_add_one(
1373                 Manager *m,
1374                 const char *what,
1375                 const char *where,
1376                 const char *options,
1377                 const char *fstype,
1378                 int passno,
1379                 bool from_proc_self_mountinfo,
1380                 bool set_flags) {
1381         int r;
1382         Unit *u;
1383         bool delete;
1384         char *e, *w = NULL, *o = NULL, *f = NULL;
1385         MountParameters *p;
1386
1387         assert(m);
1388         assert(what);
1389         assert(where);
1390         assert(options);
1391         assert(fstype);
1392
1393         assert(!set_flags || from_proc_self_mountinfo);
1394
1395         /* Ignore API mount points. They should never be referenced in
1396          * dependencies ever. */
1397         if (mount_point_is_api(where) || mount_point_ignore(where))
1398                 return 0;
1399
1400         if (streq(fstype, "autofs"))
1401                 return 0;
1402
1403         /* probably some kind of swap, ignore */
1404         if (!is_path(where))
1405                 return 0;
1406
1407         if (!(e = unit_name_from_path(where, ".mount")))
1408                 return -ENOMEM;
1409
1410         if (!(u = manager_get_unit(m, e))) {
1411                 delete = true;
1412
1413                 if (!(u = unit_new(m))) {
1414                         free(e);
1415                         return -ENOMEM;
1416                 }
1417
1418                 r = unit_add_name(u, e);
1419                 free(e);
1420
1421                 if (r < 0)
1422                         goto fail;
1423
1424                 if (!(MOUNT(u)->where = strdup(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         Meta *meta;
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, meta, m->units_by_type[UNIT_MOUNT]) {
1702                         Mount *mount = (Mount*) meta;
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, meta, m->units_by_type[UNIT_MOUNT]) {
1713                 Mount *mount = (Mount*) meta;
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(m->meta.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         .sections =
1850                 "Unit\0"
1851                 "Mount\0"
1852                 "Install\0",
1853
1854         .no_alias = true,
1855         .no_instances = true,
1856         .show_status = true,
1857
1858         .init = mount_init,
1859         .load = mount_load,
1860         .done = mount_done,
1861
1862         .coldplug = mount_coldplug,
1863
1864         .dump = mount_dump,
1865
1866         .start = mount_start,
1867         .stop = mount_stop,
1868         .reload = mount_reload,
1869
1870         .kill = mount_kill,
1871
1872         .serialize = mount_serialize,
1873         .deserialize_item = mount_deserialize_item,
1874
1875         .active_state = mount_active_state,
1876         .sub_state_to_string = mount_sub_state_to_string,
1877
1878         .check_gc = mount_check_gc,
1879
1880         .sigchld_event = mount_sigchld_event,
1881         .timer_event = mount_timer_event,
1882
1883         .reset_failed = mount_reset_failed,
1884
1885         .bus_interface = "org.freedesktop.systemd1.Mount",
1886         .bus_message_handler = bus_mount_message_handler,
1887         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1888
1889         .enumerate = mount_enumerate,
1890         .shutdown = mount_shutdown
1891 };