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