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 = u->meta.manager->default_std_output;
  73                 m->exec_context.std_error = u->meta.manager->default_std_error;
  74         }
  75
  76         /* We need to make sure that /bin/mount is always called in
  77          * the same process group as us, so that the autofs kernel
  78          * side doesn't send us another mount request while we are
  79          * already trying to comply its last one. */
  80         m->exec_context.same_pgrp = true;
  81
  82         m->timer_watch.type = WATCH_INVALID;
  83
  84         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  85
  86         m->meta.ignore_on_isolate = true;
  87 }
  88
  89 static void mount_unwatch_control_pid(Mount *m) {
  90         assert(m);
  91
  92         if (m->control_pid <= 0)
  93                 return;
  94
  95         unit_unwatch_pid(UNIT(m), m->control_pid);
  96         m->control_pid = 0;
  97 }
  98
  99 static void mount_parameters_done(MountParameters *p) {
 100         assert(p);
 101
 102         free(p->what);
 103         free(p->options);
 104         free(p->fstype);
 105
 106         p->what = p->options = p->fstype = NULL;
 107 }
 108
 109 static void mount_done(Unit *u) {
 110         Mount *m = MOUNT(u);
 111         Meta *other;
 112
 113         assert(m);
 114
 115         free(m->where);
 116         m->where = NULL;
 117
 118         /* Try to detach us from the automount unit if there is any */
 119         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_AUTOMOUNT]) {
 120                 Automount *a = (Automount*) other;
 121
 122                 if (a->mount == m)
 123                         a->mount = NULL;
 124         }
 125
 126         mount_parameters_done(&m->parameters_etc_fstab);
 127         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 128         mount_parameters_done(&m->parameters_fragment);
 129
 130         exec_context_done(&m->exec_context);
 131         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 132         m->control_command = NULL;
 133
 134         mount_unwatch_control_pid(m);
 135
 136         unit_unwatch_timer(u, &m->timer_watch);
 137 }
 138
 139 static MountParameters* get_mount_parameters_configured(Mount *m) {
 140         assert(m);
 141
 142         if (m->from_fragment)
 143                 return &m->parameters_fragment;
 144         else if (m->from_etc_fstab)
 145                 return &m->parameters_etc_fstab;
 146
 147         return NULL;
 148 }
 149
 150 static MountParameters* get_mount_parameters(Mount *m) {
 151         assert(m);
 152
 153         if (m->from_proc_self_mountinfo)
 154                 return &m->parameters_proc_self_mountinfo;
 155
 156         return get_mount_parameters_configured(m);
 157 }
 158
 159 static int mount_add_mount_links(Mount *m) {
 160         Meta *other;
 161         int r;
 162         MountParameters *pm;
 163
 164         assert(m);
 165
 166         pm = get_mount_parameters_configured(m);
 167
 168         /* Adds in links to other mount points that might lie below or
 169          * above us in the hierarchy */
 170
 171         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_MOUNT]) {
 172                 Mount *n = (Mount*) other;
 173                 MountParameters *pn;
 174
 175                 if (n == m)
 176                         continue;
 177
 178                 if (n->meta.load_state != UNIT_LOADED)
 179                         continue;
 180
 181                 pn = get_mount_parameters_configured(n);
 182
 183                 if (path_startswith(m->where, n->where)) {
 184
 185                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 186                                 return r;
 187
 188                         if (pn)
 189                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 190                                         return r;
 191
 192                 } else if (path_startswith(n->where, m->where)) {
 193
 194                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 195                                 return r;
 196
 197                         if (pm)
 198                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 199                                         return r;
 200
 201                 } else if (pm && path_startswith(pm->what, n->where)) {
 202
 203                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 204                                 return r;
 205
 206                         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 207                                 return r;
 208
 209                 } else if (pn && path_startswith(pn->what, m->where)) {
 210
 211                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 212                                 return r;
 213
 214                         if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 215                                 return r;
 216                 }
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int mount_add_swap_links(Mount *m) {
 223         Meta *other;
 224         int r;
 225
 226         assert(m);
 227
 228         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SWAP])
 229                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 230                         return r;
 231
 232         return 0;
 233 }
 234
 235 static int mount_add_path_links(Mount *m) {
 236         Meta *other;
 237         int r;
 238
 239         assert(m);
 240
 241         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_PATH])
 242                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 243                         return r;
 244
 245         return 0;
 246 }
 247
 248 static int mount_add_automount_links(Mount *m) {
 249         Meta *other;
 250         int r;
 251
 252         assert(m);
 253
 254         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_AUTOMOUNT])
 255                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 256                         return r;
 257
 258         return 0;
 259 }
 260
 261 static int mount_add_socket_links(Mount *m) {
 262         Meta *other;
 263         int r;
 264
 265         assert(m);
 266
 267         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SOCKET])
 268                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 269                         return r;
 270
 271         return 0;
 272 }
 273
 274 static char* mount_test_option(const char *haystack, const char *needle) {
 275         struct mntent me;
 276
 277         assert(needle);
 278
 279         /* Like glibc's hasmntopt(), but works on a string, not a
 280          * struct mntent */
 281
 282         if (!haystack)
 283                 return false;
 284
 285         zero(me);
 286         me.mnt_opts = (char*) haystack;
 287
 288         return hasmntopt(&me, needle);
 289 }
 290
 291 static bool mount_is_network(MountParameters *p) {
 292         assert(p);
 293
 294         if (mount_test_option(p->options, "_netdev"))
 295                 return true;
 296
 297         if (p->fstype && fstype_is_network(p->fstype))
 298                 return true;
 299
 300         return false;
 301 }
 302
 303 static bool mount_is_bind(MountParameters *p) {
 304         assert(p);
 305
 306         if (mount_test_option(p->options, "bind"))
 307                 return true;
 308
 309         if (p->fstype && streq(p->fstype, "bind"))
 310                 return true;
 311
 312         return false;
 313 }
 314
 315 static bool needs_quota(MountParameters *p) {
 316         assert(p);
 317
 318         if (mount_is_network(p))
 319                 return false;
 320
 321         if (mount_is_bind(p))
 322                 return false;
 323
 324         return mount_test_option(p->options, "usrquota") ||
 325                 mount_test_option(p->options, "grpquota") ||
 326                 mount_test_option(p->options, "quota") ||
 327                 mount_test_option(p->options, "usrjquota") ||
 328                 mount_test_option(p->options, "grpjquota");
 329 }
 330
 331 static int mount_add_fstab_links(Mount *m) {
 332         const char *target, *after = NULL, *after2 = NULL;
 333         MountParameters *p;
 334         Unit *tu;
 335         int r;
 336         bool noauto, nofail, handle, automount;
 337
 338         assert(m);
 339
 340         if (m->meta.manager->running_as != MANAGER_SYSTEM)
 341                 return 0;
 342
 343         if (!(p = get_mount_parameters_configured(m)))
 344                 return 0;
 345
 346         if (p != &m->parameters_etc_fstab)
 347                 return 0;
 348
 349         noauto = !!mount_test_option(p->options, "noauto");
 350         nofail = !!mount_test_option(p->options, "nofail");
 351         automount =
 352                 mount_test_option(p->options, "comment=systemd.automount") ||
 353                 mount_test_option(p->options, "x-systemd-automount");
 354         handle =
 355                 automount ||
 356                 mount_test_option(p->options, "comment=systemd.mount") ||
 357                 mount_test_option(p->options, "x-systemd-mount") ||
 358                 m->meta.manager->mount_auto;
 359
 360         if (mount_is_network(p)) {
 361                 target = SPECIAL_REMOTE_FS_TARGET;
 362                 after = SPECIAL_REMOTE_FS_PRE_TARGET;
 363                 after2 = SPECIAL_NETWORK_TARGET;
 364         } else {
 365                 target = SPECIAL_LOCAL_FS_TARGET;
 366                 after = SPECIAL_LOCAL_FS_PRE_TARGET;
 367         }
 368
 369         if (!path_equal(m->where, "/"))
 370                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 371                         return r;
 372
 373         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 374                 return r;
 375
 376         if (after)
 377                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0)
 378                         return r;
 379
 380         if (after2)
 381                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after2, NULL, true)) < 0)
 382                         return r;
 383
 384         if (automount) {
 385                 Unit *am;
 386
 387                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 388                         return r;
 389
 390                 /* If auto is configured as well also pull in the
 391                  * mount right-away, but don't rely on it. */
 392                 if (!noauto) /* automount + auto */
 393                         if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 394                                 return r;
 395
 396                 /* Install automount unit */
 397                 if (!nofail) /* automount + fail */
 398                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(am), true);
 399                 else /* automount + nofail */
 400                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 401
 402         } else if (handle && !noauto) {
 403
 404                 /* Automatically add mount points that aren't natively
 405                  * configured to local-fs.target */
 406
 407                 if (!nofail) /* auto + fail */
 408                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
 409                 else /* auto + nofail */
 410                         return unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true);
 411         }
 412
 413         return 0;
 414 }
 415
 416 static int mount_add_device_links(Mount *m) {
 417         MountParameters *p;
 418         int r;
 419
 420         assert(m);
 421
 422         if (!(p = get_mount_parameters_configured(m)))
 423                 return 0;
 424
 425         if (!p->what)
 426                 return 0;
 427
 428         if (!mount_is_bind(p) &&
 429             !path_equal(m->where, "/") &&
 430             p == &m->parameters_etc_fstab) {
 431                 bool nofail, noauto;
 432
 433                 noauto = !!mount_test_option(p->options, "noauto");
 434                 nofail = !!mount_test_option(p->options, "nofail");
 435
 436                 if ((r = unit_add_node_link(UNIT(m), p->what,
 437                                             !noauto && nofail &&
 438                                             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
 439                         return r;
 440         }
 441
 442         if (p->passno > 0 &&
 443             !mount_is_bind(p) &&
 444             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
 445             !path_equal(m->where, "/")) {
 446                 char *name;
 447                 Unit *fsck;
 448                 /* Let's add in the fsck service */
 449
 450                 /* aka SPECIAL_FSCK_SERVICE */
 451                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 452                         return -ENOMEM;
 453
 454                 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
 455                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 456                         free(name);
 457                         return r;
 458                 }
 459
 460                 free(name);
 461
 462                 SERVICE(fsck)->fsck_passno = p->passno;
 463
 464                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 465                         return r;
 466         }
 467
 468         return 0;
 469 }
 470
 471 static int mount_add_default_dependencies(Mount *m) {
 472         int r;
 473
 474         assert(m);
 475
 476         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 477             !path_equal(m->where, "/")) {
 478                 MountParameters *p;
 479
 480                 p = get_mount_parameters_configured(m);
 481
 482                 if (p && needs_quota(p)) {
 483                         if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
 484                             (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
 485                                 return r;
 486                 }
 487
 488                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 489                         return r;
 490         }
 491
 492         return 0;
 493 }
 494
 495 static int mount_fix_timeouts(Mount *m) {
 496         MountParameters *p;
 497         const char *timeout = NULL;
 498         Unit *other;
 499         Iterator i;
 500         usec_t u;
 501         char *t;
 502         int r;
 503
 504         assert(m);
 505
 506         if (!(p = get_mount_parameters_configured(m)))
 507                 return 0;
 508
 509         /* Allow configuration how long we wait for a device that
 510          * backs a mount point to show up. This is useful to support
 511          * endless device timeouts for devices that show up only after
 512          * user input, like crypto devices. */
 513
 514         if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
 515                 timeout += 31;
 516         else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
 517                 timeout += 25;
 518         else
 519                 return 0;
 520
 521         t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
 522         if (!t)
 523                 return -ENOMEM;
 524
 525         r = parse_usec(t, &u);
 526         free(t);
 527
 528         if (r < 0) {
 529                 log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
 530                 return r;
 531         }
 532
 533         SET_FOREACH(other, m->meta.dependencies[UNIT_AFTER], i) {
 534                 if (other->meta.type != UNIT_DEVICE)
 535                         continue;
 536
 537                 other->meta.job_timeout = u;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int mount_verify(Mount *m) {
 544         bool b;
 545         char *e;
 546         assert(m);
 547
 548         if (m->meta.load_state != UNIT_LOADED)
 549                 return 0;
 550
 551         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 552                 return -ENOENT;
 553
 554         if (!(e = unit_name_from_path(m->where, ".mount")))
 555                 return -ENOMEM;
 556
 557         b = unit_has_name(UNIT(m), e);
 558         free(e);
 559
 560         if (!b) {
 561                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 562                 return -EINVAL;
 563         }
 564
 565         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 566                 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
 567                 return -EINVAL;
 568         }
 569
 570         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 571                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 572                 return -EBADMSG;
 573         }
 574
 575         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 576                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 577                 return -EINVAL;
 578         }
 579
 580         return 0;
 581 }
 582
 583 static int mount_load(Unit *u) {
 584         Mount *m = MOUNT(u);
 585         int r;
 586
 587         assert(u);
 588         assert(u->meta.load_state == UNIT_STUB);
 589
 590         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 591                 return r;
 592
 593         /* This is a new unit? Then let's add in some extras */
 594         if (u->meta.load_state == UNIT_LOADED) {
 595                 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
 596                         return r;
 597
 598                 if (m->meta.fragment_path)
 599                         m->from_fragment = true;
 600                 else if (m->from_etc_fstab)
 601                         m->meta.default_dependencies = false;
 602
 603                 if (!m->where)
 604                         if (!(m->where = unit_name_to_path(u->meta.id)))
 605                                 return -ENOMEM;
 606
 607                 path_kill_slashes(m->where);
 608
 609                 if (!m->meta.description)
 610                         if ((r = unit_set_description(u, m->where)) < 0)
 611                                 return r;
 612
 613                 if ((r = mount_add_device_links(m)) < 0)
 614                         return r;
 615
 616                 if ((r = mount_add_mount_links(m)) < 0)
 617                         return r;
 618
 619                 if ((r = mount_add_socket_links(m)) < 0)
 620                         return r;
 621
 622                 if ((r = mount_add_swap_links(m)) < 0)
 623                         return r;
 624
 625                 if ((r = mount_add_path_links(m)) < 0)
 626                         return r;
 627
 628                 if ((r = mount_add_automount_links(m)) < 0)
 629                         return r;
 630
 631                 if ((r = mount_add_fstab_links(m)) < 0)
 632                         return r;
 633
 634                 if (m->meta.default_dependencies)
 635                         if ((r = mount_add_default_dependencies(m)) < 0)
 636                                 return r;
 637
 638                 if ((r = unit_add_default_cgroups(u)) < 0)
 639                         return r;
 640
 641                 mount_fix_timeouts(m);
 642         }
 643
 644         return mount_verify(m);
 645 }
 646
 647 static int mount_notify_automount(Mount *m, int status) {
 648         Unit *p;
 649         int r;
 650
 651         assert(m);
 652
 653         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 654                 return r == -ENOENT ? 0 : r;
 655
 656         return automount_send_ready(AUTOMOUNT(p), status);
 657 }
 658
 659 static void mount_set_state(Mount *m, MountState state) {
 660         MountState old_state;
 661         assert(m);
 662
 663         old_state = m->state;
 664         m->state = state;
 665
 666         if (state != MOUNT_MOUNTING &&
 667             state != MOUNT_MOUNTING_DONE &&
 668             state != MOUNT_REMOUNTING &&
 669             state != MOUNT_UNMOUNTING &&
 670             state != MOUNT_MOUNTING_SIGTERM &&
 671             state != MOUNT_MOUNTING_SIGKILL &&
 672             state != MOUNT_UNMOUNTING_SIGTERM &&
 673             state != MOUNT_UNMOUNTING_SIGKILL &&
 674             state != MOUNT_REMOUNTING_SIGTERM &&
 675             state != MOUNT_REMOUNTING_SIGKILL) {
 676                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 677                 mount_unwatch_control_pid(m);
 678                 m->control_command = NULL;
 679                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 680         }
 681
 682         if (state == MOUNT_MOUNTED ||
 683             state == MOUNT_REMOUNTING)
 684                 mount_notify_automount(m, 0);
 685         else if (state == MOUNT_DEAD ||
 686                  state == MOUNT_UNMOUNTING ||
 687                  state == MOUNT_MOUNTING_SIGTERM ||
 688                  state == MOUNT_MOUNTING_SIGKILL ||
 689                  state == MOUNT_REMOUNTING_SIGTERM ||
 690                  state == MOUNT_REMOUNTING_SIGKILL ||
 691                  state == MOUNT_UNMOUNTING_SIGTERM ||
 692                  state == MOUNT_UNMOUNTING_SIGKILL ||
 693                  state == MOUNT_FAILED)
 694                 mount_notify_automount(m, -ENODEV);
 695
 696         if (state != old_state)
 697                 log_debug("%s changed %s -> %s",
 698                           m->meta.id,
 699                           mount_state_to_string(old_state),
 700                           mount_state_to_string(state));
 701
 702         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], !m->reload_failure);
 703         m->reload_failure = false;
 704 }
 705
 706 static int mount_coldplug(Unit *u) {
 707         Mount *m = MOUNT(u);
 708         MountState new_state = MOUNT_DEAD;
 709         int r;
 710
 711         assert(m);
 712         assert(m->state == MOUNT_DEAD);
 713
 714         if (m->deserialized_state != m->state)
 715                 new_state = m->deserialized_state;
 716         else if (m->from_proc_self_mountinfo)
 717                 new_state = MOUNT_MOUNTED;
 718
 719         if (new_state != m->state) {
 720
 721                 if (new_state == MOUNT_MOUNTING ||
 722                     new_state == MOUNT_MOUNTING_DONE ||
 723                     new_state == MOUNT_REMOUNTING ||
 724                     new_state == MOUNT_UNMOUNTING ||
 725                     new_state == MOUNT_MOUNTING_SIGTERM ||
 726                     new_state == MOUNT_MOUNTING_SIGKILL ||
 727                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 728                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 729                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 730                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 731
 732                         if (m->control_pid <= 0)
 733                                 return -EBADMSG;
 734
 735                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 736                                 return r;
 737
 738                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 739                                 return r;
 740                 }
 741
 742                 mount_set_state(m, new_state);
 743         }
 744
 745         return 0;
 746 }
 747
 748 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 749         Mount *m = MOUNT(u);
 750         MountParameters *p;
 751
 752         assert(m);
 753         assert(f);
 754
 755         p = get_mount_parameters(m);
 756
 757         fprintf(f,
 758                 "%sMount State: %s\n"
 759                 "%sWhere: %s\n"
 760                 "%sWhat: %s\n"
 761                 "%sFile System Type: %s\n"
 762                 "%sOptions: %s\n"
 763                 "%sFrom /etc/fstab: %s\n"
 764                 "%sFrom /proc/self/mountinfo: %s\n"
 765                 "%sFrom fragment: %s\n"
 766                 "%sDirectoryMode: %04o\n",
 767                 prefix, mount_state_to_string(m->state),
 768                 prefix, m->where,
 769                 prefix, strna(p->what),
 770                 prefix, strna(p->fstype),
 771                 prefix, strna(p->options),
 772                 prefix, yes_no(m->from_etc_fstab),
 773                 prefix, yes_no(m->from_proc_self_mountinfo),
 774                 prefix, yes_no(m->from_fragment),
 775                 prefix, m->directory_mode);
 776
 777         if (m->control_pid > 0)
 778                 fprintf(f,
 779                         "%sControl PID: %lu\n",
 780                         prefix, (unsigned long) m->control_pid);
 781
 782         exec_context_dump(&m->exec_context, f, prefix);
 783 }
 784
 785 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 786         pid_t pid;
 787         int r;
 788
 789         assert(m);
 790         assert(c);
 791         assert(_pid);
 792
 793         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 794                 goto fail;
 795
 796         if ((r = exec_spawn(c,
 797                             NULL,
 798                             &m->exec_context,
 799                             NULL, 0,
 800                             m->meta.manager->environment,
 801                             true,
 802                             true,
 803                             true,
 804                             m->meta.manager->confirm_spawn,
 805                             m->meta.cgroup_bondings,
 806                             m->meta.cgroup_attributes,
 807                             &pid)) < 0)
 808                 goto fail;
 809
 810         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 811                 /* FIXME: we need to do something here */
 812                 goto fail;
 813
 814         *_pid = pid;
 815
 816         return 0;
 817
 818 fail:
 819         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 820
 821         return r;
 822 }
 823
 824 static void mount_enter_dead(Mount *m, bool success) {
 825         assert(m);
 826
 827         if (!success)
 828                 m->failure = true;
 829
 830         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 831 }
 832
 833 static void mount_enter_mounted(Mount *m, bool success) {
 834         assert(m);
 835
 836         if (!success)
 837                 m->failure = true;
 838
 839         mount_set_state(m, MOUNT_MOUNTED);
 840 }
 841
 842 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 843         int r;
 844         Set *pid_set = NULL;
 845         bool wait_for_exit = false;
 846
 847         assert(m);
 848
 849         if (!success)
 850                 m->failure = true;
 851
 852         if (m->exec_context.kill_mode != KILL_NONE) {
 853                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 854                            state == MOUNT_UNMOUNTING_SIGTERM ||
 855                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 856
 857                 if (m->control_pid > 0) {
 858                         if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
 859
 860                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 861                         else
 862                                 wait_for_exit = true;
 863                 }
 864
 865                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 866
 867                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 868                                 r = -ENOMEM;
 869                                 goto fail;
 870                         }
 871
 872                         /* Exclude the control pid from being killed via the cgroup */
 873                         if (m->control_pid > 0)
 874                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 875                                         goto fail;
 876
 877                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
 878                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 879                                         log_warning("Failed to kill control group: %s", strerror(-r));
 880                         } else if (r > 0)
 881                                 wait_for_exit = true;
 882
 883                         set_free(pid_set);
 884                         pid_set = NULL;
 885                 }
 886         }
 887
 888         if (wait_for_exit) {
 889                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 890                         goto fail;
 891
 892                 mount_set_state(m, state);
 893         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 894                 mount_enter_mounted(m, true);
 895         else
 896                 mount_enter_dead(m, true);
 897
 898         return;
 899
 900 fail:
 901         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 902
 903         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 904                 mount_enter_mounted(m, false);
 905         else
 906                 mount_enter_dead(m, false);
 907
 908         if (pid_set)
 909                 set_free(pid_set);
 910 }
 911
 912 static void mount_enter_unmounting(Mount *m, bool success) {
 913         int r;
 914
 915         assert(m);
 916
 917         if (!success)
 918                 m->failure = true;
 919
 920         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 921         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 922
 923         if ((r = exec_command_set(
 924                              m->control_command,
 925                              "/bin/umount",
 926                              m->where,
 927                              NULL)) < 0)
 928                 goto fail;
 929
 930         mount_unwatch_control_pid(m);
 931
 932         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 933                 goto fail;
 934
 935         mount_set_state(m, MOUNT_UNMOUNTING);
 936
 937         return;
 938
 939 fail:
 940         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 941         mount_enter_mounted(m, false);
 942 }
 943
 944 static void mount_enter_mounting(Mount *m) {
 945         int r;
 946         MountParameters *p;
 947
 948         assert(m);
 949
 950         m->control_command_id = MOUNT_EXEC_MOUNT;
 951         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 952
 953         mkdir_p(m->where, m->directory_mode);
 954
 955         /* Create the source directory for bind-mounts if needed */
 956         p = get_mount_parameters_configured(m);
 957         if (p && mount_is_bind(p))
 958                 mkdir_p(p->what, m->directory_mode);
 959
 960         if (m->from_fragment)
 961                 r = exec_command_set(
 962                                 m->control_command,
 963                                 "/bin/mount",
 964                                 m->parameters_fragment.what,
 965                                 m->where,
 966                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 967                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 968                                 NULL);
 969         else if (m->from_etc_fstab)
 970                 r = exec_command_set(
 971                                 m->control_command,
 972                                 "/bin/mount",
 973                                 m->where,
 974                                 NULL);
 975         else
 976                 r = -ENOENT;
 977
 978         if (r < 0)
 979                 goto fail;
 980
 981         mount_unwatch_control_pid(m);
 982
 983         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 984                 goto fail;
 985
 986         mount_set_state(m, MOUNT_MOUNTING);
 987
 988         return;
 989
 990 fail:
 991         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 992         mount_enter_dead(m, false);
 993 }
 994
 995 static void mount_enter_mounting_done(Mount *m) {
 996         assert(m);
 997
 998         mount_set_state(m, MOUNT_MOUNTING_DONE);
 999 }
1000
1001 static void mount_enter_remounting(Mount *m, bool success) {
1002         int r;
1003
1004         assert(m);
1005
1006         if (!success)
1007                 m->failure = true;
1008
1009         m->control_command_id = MOUNT_EXEC_REMOUNT;
1010         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1011
1012         if (m->from_fragment) {
1013                 char *buf = NULL;
1014                 const char *o;
1015
1016                 if (m->parameters_fragment.options) {
1017                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
1018                                 r = -ENOMEM;
1019                                 goto fail;
1020                         }
1021
1022                         o = buf;
1023                 } else
1024                         o = "remount";
1025
1026                 r = exec_command_set(
1027                                 m->control_command,
1028                                 "/bin/mount",
1029                                 m->parameters_fragment.what,
1030                                 m->where,
1031                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
1032                                 "-o", o,
1033                                 NULL);
1034
1035                 free(buf);
1036         } else if (m->from_etc_fstab)
1037                 r = exec_command_set(
1038                                 m->control_command,
1039                                 "/bin/mount",
1040                                 m->where,
1041                                 "-o", "remount",
1042                                 NULL);
1043         else
1044                 r = -ENOENT;
1045
1046         if (r < 0)
1047                 goto fail;
1048
1049         mount_unwatch_control_pid(m);
1050
1051         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
1052                 goto fail;
1053
1054         mount_set_state(m, MOUNT_REMOUNTING);
1055
1056         return;
1057
1058 fail:
1059         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
1060         m->reload_failure = true;
1061         mount_enter_mounted(m, true);
1062 }
1063
1064 static int mount_start(Unit *u) {
1065         Mount *m = MOUNT(u);
1066
1067         assert(m);
1068
1069         /* We cannot fulfill this request right now, try again later
1070          * please! */
1071         if (m->state == MOUNT_UNMOUNTING ||
1072             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1073             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1074             m->state == MOUNT_MOUNTING_SIGTERM ||
1075             m->state == MOUNT_MOUNTING_SIGKILL)
1076                 return -EAGAIN;
1077
1078         /* Already on it! */
1079         if (m->state == MOUNT_MOUNTING)
1080                 return 0;
1081
1082         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1083
1084         m->failure = false;
1085         mount_enter_mounting(m);
1086         return 0;
1087 }
1088
1089 static int mount_stop(Unit *u) {
1090         Mount *m = MOUNT(u);
1091
1092         assert(m);
1093
1094         /* Already on it */
1095         if (m->state == MOUNT_UNMOUNTING ||
1096             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1097             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1098             m->state == MOUNT_MOUNTING_SIGTERM ||
1099             m->state == MOUNT_MOUNTING_SIGKILL)
1100                 return 0;
1101
1102         assert(m->state == MOUNT_MOUNTING ||
1103                m->state == MOUNT_MOUNTING_DONE ||
1104                m->state == MOUNT_MOUNTED ||
1105                m->state == MOUNT_REMOUNTING ||
1106                m->state == MOUNT_REMOUNTING_SIGTERM ||
1107                m->state == MOUNT_REMOUNTING_SIGKILL);
1108
1109         mount_enter_unmounting(m, true);
1110         return 0;
1111 }
1112
1113 static int mount_reload(Unit *u) {
1114         Mount *m = MOUNT(u);
1115
1116         assert(m);
1117
1118         if (m->state == MOUNT_MOUNTING_DONE)
1119                 return -EAGAIN;
1120
1121         assert(m->state == MOUNT_MOUNTED);
1122
1123         mount_enter_remounting(m, true);
1124         return 0;
1125 }
1126
1127 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1128         Mount *m = MOUNT(u);
1129
1130         assert(m);
1131         assert(f);
1132         assert(fds);
1133
1134         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1135         unit_serialize_item(u, f, "failure", yes_no(m->failure));
1136
1137         if (m->control_pid > 0)
1138                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1139
1140         if (m->control_command_id >= 0)
1141                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1142
1143         return 0;
1144 }
1145
1146 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1147         Mount *m = MOUNT(u);
1148
1149         assert(u);
1150         assert(key);
1151         assert(value);
1152         assert(fds);
1153
1154         if (streq(key, "state")) {
1155                 MountState state;
1156
1157                 if ((state = mount_state_from_string(value)) < 0)
1158                         log_debug("Failed to parse state value %s", value);
1159                 else
1160                         m->deserialized_state = state;
1161         } else if (streq(key, "failure")) {
1162                 int b;
1163
1164                 if ((b = parse_boolean(value)) < 0)
1165                         log_debug("Failed to parse failure value %s", value);
1166                 else
1167                         m->failure = b || m->failure;
1168
1169         } else if (streq(key, "control-pid")) {
1170                 pid_t pid;
1171
1172                 if (parse_pid(value, &pid) < 0)
1173                         log_debug("Failed to parse control-pid value %s", value);
1174                 else
1175                         m->control_pid = pid;
1176         } else if (streq(key, "control-command")) {
1177                 MountExecCommand id;
1178
1179                 if ((id = mount_exec_command_from_string(value)) < 0)
1180                         log_debug("Failed to parse exec-command value %s", value);
1181                 else {
1182                         m->control_command_id = id;
1183                         m->control_command = m->exec_command + id;
1184                 }
1185
1186         } else
1187                 log_debug("Unknown serialization key '%s'", key);
1188
1189         return 0;
1190 }
1191
1192 static UnitActiveState mount_active_state(Unit *u) {
1193         assert(u);
1194
1195         return state_translation_table[MOUNT(u)->state];
1196 }
1197
1198 static const char *mount_sub_state_to_string(Unit *u) {
1199         assert(u);
1200
1201         return mount_state_to_string(MOUNT(u)->state);
1202 }
1203
1204 static bool mount_check_gc(Unit *u) {
1205         Mount *m = MOUNT(u);
1206
1207         assert(m);
1208
1209         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1210 }
1211
1212 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1213         Mount *m = MOUNT(u);
1214         bool success;
1215
1216         assert(m);
1217         assert(pid >= 0);
1218
1219         if (pid != m->control_pid)
1220                 return;
1221
1222         m->control_pid = 0;
1223
1224         success = is_clean_exit(code, status);
1225         m->failure = m->failure || !success;
1226
1227         if (m->control_command) {
1228                 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1229                 m->control_command = NULL;
1230                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1231         }
1232
1233         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1234                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1235
1236         /* Note that mount(8) returning and the kernel sending us a
1237          * mount table change event might happen out-of-order. If an
1238          * operation succeed we assume the kernel will follow soon too
1239          * and already change into the resulting state.  If it fails
1240          * we check if the kernel still knows about the mount. and
1241          * change state accordingly. */
1242
1243         switch (m->state) {
1244
1245         case MOUNT_MOUNTING:
1246         case MOUNT_MOUNTING_DONE:
1247         case MOUNT_MOUNTING_SIGKILL:
1248         case MOUNT_MOUNTING_SIGTERM:
1249
1250                 if (success)
1251                         mount_enter_mounted(m, true);
1252                 else if (m->from_proc_self_mountinfo)
1253                         mount_enter_mounted(m, false);
1254                 else
1255                         mount_enter_dead(m, false);
1256                 break;
1257
1258         case MOUNT_REMOUNTING:
1259         case MOUNT_REMOUNTING_SIGKILL:
1260         case MOUNT_REMOUNTING_SIGTERM:
1261
1262                 m->reload_failure = !success;
1263                 if (m->from_proc_self_mountinfo)
1264                         mount_enter_mounted(m, true);
1265                 else
1266                         mount_enter_dead(m, true);
1267
1268                 break;
1269
1270         case MOUNT_UNMOUNTING:
1271         case MOUNT_UNMOUNTING_SIGKILL:
1272         case MOUNT_UNMOUNTING_SIGTERM:
1273
1274                 if (success)
1275                         mount_enter_dead(m, true);
1276                 else if (m->from_proc_self_mountinfo)
1277                         mount_enter_mounted(m, false);
1278                 else
1279                         mount_enter_dead(m, false);
1280                 break;
1281
1282         default:
1283                 assert_not_reached("Uh, control process died at wrong time.");
1284         }
1285
1286         /* Notify clients about changed exit status */
1287         unit_add_to_dbus_queue(u);
1288 }
1289
1290 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1291         Mount *m = MOUNT(u);
1292
1293         assert(m);
1294         assert(elapsed == 1);
1295         assert(w == &m->timer_watch);
1296
1297         switch (m->state) {
1298
1299         case MOUNT_MOUNTING:
1300         case MOUNT_MOUNTING_DONE:
1301                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1302                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1303                 break;
1304
1305         case MOUNT_REMOUNTING:
1306                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1307                 m->reload_failure = true;
1308                 mount_enter_mounted(m, true);
1309                 break;
1310
1311         case MOUNT_UNMOUNTING:
1312                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1313                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1314                 break;
1315
1316         case MOUNT_MOUNTING_SIGTERM:
1317                 if (m->exec_context.send_sigkill) {
1318                         log_warning("%s mounting timed out. Killing.", u->meta.id);
1319                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1320                 } else {
1321                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1322
1323                         if (m->from_proc_self_mountinfo)
1324                                 mount_enter_mounted(m, false);
1325                         else
1326                                 mount_enter_dead(m, false);
1327                 }
1328                 break;
1329
1330         case MOUNT_REMOUNTING_SIGTERM:
1331                 if (m->exec_context.send_sigkill) {
1332                         log_warning("%s remounting timed out. Killing.", u->meta.id);
1333                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1334                 } else {
1335                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1336
1337                         if (m->from_proc_self_mountinfo)
1338                                 mount_enter_mounted(m, false);
1339                         else
1340                                 mount_enter_dead(m, false);
1341                 }
1342                 break;
1343
1344         case MOUNT_UNMOUNTING_SIGTERM:
1345                 if (m->exec_context.send_sigkill) {
1346                         log_warning("%s unmounting timed out. Killing.", u->meta.id);
1347                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1348                 } else {
1349                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1350
1351                         if (m->from_proc_self_mountinfo)
1352                                 mount_enter_mounted(m, false);
1353                         else
1354                                 mount_enter_dead(m, false);
1355                 }
1356                 break;
1357
1358         case MOUNT_MOUNTING_SIGKILL:
1359         case MOUNT_REMOUNTING_SIGKILL:
1360         case MOUNT_UNMOUNTING_SIGKILL:
1361                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1362
1363                 if (m->from_proc_self_mountinfo)
1364                         mount_enter_mounted(m, false);
1365                 else
1366                         mount_enter_dead(m, false);
1367                 break;
1368
1369         default:
1370                 assert_not_reached("Timeout at wrong time.");
1371         }
1372 }
1373
1374 static int mount_add_one(
1375                 Manager *m,
1376                 const char *what,
1377                 const char *where,
1378                 const char *options,
1379                 const char *fstype,
1380                 int passno,
1381                 bool from_proc_self_mountinfo,
1382                 bool set_flags) {
1383         int r;
1384         Unit *u;
1385         bool delete;
1386         char *e, *w = NULL, *o = NULL, *f = NULL;
1387         MountParameters *p;
1388
1389         assert(m);
1390         assert(what);
1391         assert(where);
1392         assert(options);
1393         assert(fstype);
1394
1395         assert(!set_flags || from_proc_self_mountinfo);
1396
1397         /* Ignore API mount points. They should never be referenced in
1398          * dependencies ever. */
1399         if (mount_point_is_api(where) || mount_point_ignore(where))
1400                 return 0;
1401
1402         if (streq(fstype, "autofs"))
1403                 return 0;
1404
1405         /* probably some kind of swap, ignore */
1406         if (!is_path(where))
1407                 return 0;
1408
1409         if (!(e = unit_name_from_path(where, ".mount")))
1410                 return -ENOMEM;
1411
1412         if (!(u = manager_get_unit(m, e))) {
1413                 delete = true;
1414
1415                 if (!(u = unit_new(m))) {
1416                         free(e);
1417                         return -ENOMEM;
1418                 }
1419
1420                 r = unit_add_name(u, e);
1421                 free(e);
1422
1423                 if (r < 0)
1424                         goto fail;
1425
1426                 if (!(MOUNT(u)->where = strdup(where))) {
1427                         r = -ENOMEM;
1428                         goto fail;
1429                 }
1430
1431                 unit_add_to_load_queue(u);
1432         } else {
1433                 delete = false;
1434                 free(e);
1435         }
1436
1437         if (!(w = strdup(what)) ||
1438             !(o = strdup(options)) ||
1439             !(f = strdup(fstype))) {
1440                 r = -ENOMEM;
1441                 goto fail;
1442         }
1443
1444         if (from_proc_self_mountinfo) {
1445                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1446
1447                 if (set_flags) {
1448                         MOUNT(u)->is_mounted = true;
1449                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1450                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1451                 }
1452
1453                 MOUNT(u)->from_proc_self_mountinfo = true;
1454         } else {
1455                 p = &MOUNT(u)->parameters_etc_fstab;
1456                 MOUNT(u)->from_etc_fstab = true;
1457         }
1458
1459         free(p->what);
1460         p->what = w;
1461
1462         free(p->options);
1463         p->options = o;
1464
1465         free(p->fstype);
1466         p->fstype = f;
1467
1468         p->passno = passno;
1469
1470         unit_add_to_dbus_queue(u);
1471
1472         return 0;
1473
1474 fail:
1475         free(w);
1476         free(o);
1477         free(f);
1478
1479         if (delete && u)
1480                 unit_free(u);
1481
1482         return r;
1483 }
1484
1485 static int mount_find_pri(char *options) {
1486         char *end, *pri;
1487         unsigned long r;
1488
1489         if (!(pri = mount_test_option(options, "pri")))
1490                 return 0;
1491
1492         pri += 4;
1493
1494         errno = 0;
1495         r = strtoul(pri, &end, 10);
1496
1497         if (errno != 0)
1498                 return -errno;
1499
1500         if (end == pri || (*end != ',' && *end != 0))
1501                 return -EINVAL;
1502
1503         return (int) r;
1504 }
1505
1506 static int mount_load_etc_fstab(Manager *m) {
1507         FILE *f;
1508         int r = 0;
1509         struct mntent* me;
1510
1511         assert(m);
1512
1513         errno = 0;
1514         if (!(f = setmntent("/etc/fstab", "r")))
1515                 return -errno;
1516
1517         while ((me = getmntent(f))) {
1518                 char *where, *what;
1519                 int k;
1520
1521                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1522                         r = -ENOMEM;
1523                         goto finish;
1524                 }
1525
1526                 if (!(where = strdup(me->mnt_dir))) {
1527                         free(what);
1528                         r = -ENOMEM;
1529                         goto finish;
1530                 }
1531
1532                 if (what[0] == '/')
1533                         path_kill_slashes(what);
1534
1535                 if (where[0] == '/')
1536                         path_kill_slashes(where);
1537
1538                 if (streq(me->mnt_type, "swap")) {
1539                         int pri;
1540
1541                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1542                                 k = pri;
1543                         else
1544                                 k = swap_add_one(m,
1545                                                  what,
1546                                                  NULL,
1547                                                  pri,
1548                                                  !!mount_test_option(me->mnt_opts, "noauto"),
1549                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1550                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1551                                                  false);
1552                 } else
1553                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1554
1555                 free(what);
1556                 free(where);
1557
1558                 if (r < 0)
1559                         r = k;
1560         }
1561
1562 finish:
1563
1564         endmntent(f);
1565         return r;
1566 }
1567
1568 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1569         int r = 0;
1570         unsigned i;
1571         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1572
1573         assert(m);
1574
1575         rewind(m->proc_self_mountinfo);
1576
1577         for (i = 1;; i++) {
1578                 int k;
1579
1580                 device = path = options = options2 = fstype = d = p = o = NULL;
1581
1582                 if ((k = fscanf(m->proc_self_mountinfo,
1583                                 "%*s "       /* (1) mount id */
1584                                 "%*s "       /* (2) parent id */
1585                                 "%*s "       /* (3) major:minor */
1586                                 "%*s "       /* (4) root */
1587                                 "%ms "       /* (5) mount point */
1588                                 "%ms"        /* (6) mount options */
1589                                 "%*[^-]"     /* (7) optional fields */
1590                                 "- "         /* (8) separator */
1591                                 "%ms "       /* (9) file system type */
1592                                 "%ms"        /* (10) mount source */
1593                                 "%ms"        /* (11) mount options 2 */
1594                                 "%*[^\n]",   /* some rubbish at the end */
1595                                 &path,
1596                                 &options,
1597                                 &fstype,
1598                                 &device,
1599                                 &options2)) != 5) {
1600
1601                         if (k == EOF)
1602                                 break;
1603
1604                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1605                         goto clean_up;
1606                 }
1607
1608                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1609                         r = -ENOMEM;
1610                         goto finish;
1611                 }
1612
1613                 if (!(d = cunescape(device)) ||
1614                     !(p = cunescape(path))) {
1615                         r = -ENOMEM;
1616                         goto finish;
1617                 }
1618
1619                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1620                         r = k;
1621
1622 clean_up:
1623                 free(device);
1624                 free(path);
1625                 free(options);
1626                 free(options2);
1627                 free(fstype);
1628                 free(d);
1629                 free(p);
1630                 free(o);
1631         }
1632
1633 finish:
1634         free(device);
1635         free(path);
1636         free(options);
1637         free(options2);
1638         free(fstype);
1639         free(d);
1640         free(p);
1641         free(o);
1642
1643         return r;
1644 }
1645
1646 static void mount_shutdown(Manager *m) {
1647         assert(m);
1648
1649         if (m->proc_self_mountinfo) {
1650                 fclose(m->proc_self_mountinfo);
1651                 m->proc_self_mountinfo = NULL;
1652         }
1653 }
1654
1655 static int mount_enumerate(Manager *m) {
1656         int r;
1657         struct epoll_event ev;
1658         assert(m);
1659
1660         if (!m->proc_self_mountinfo) {
1661                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1662                         return -errno;
1663
1664                 m->mount_watch.type = WATCH_MOUNT;
1665                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1666
1667                 zero(ev);
1668                 ev.events = EPOLLPRI;
1669                 ev.data.ptr = &m->mount_watch;
1670
1671                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1672                         return -errno;
1673         }
1674
1675         if ((r = mount_load_etc_fstab(m)) < 0)
1676                 goto fail;
1677
1678         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1679                 goto fail;
1680
1681         return 0;
1682
1683 fail:
1684         mount_shutdown(m);
1685         return r;
1686 }
1687
1688 void mount_fd_event(Manager *m, int events) {
1689         Meta *meta;
1690         int r;
1691
1692         assert(m);
1693         assert(events & EPOLLPRI);
1694
1695         /* The manager calls this for every fd event happening on the
1696          * /proc/self/mountinfo file, which informs us about mounting
1697          * table changes */
1698
1699         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1700                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1701
1702                 /* Reset flags, just in case, for later calls */
1703                 LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_MOUNT]) {
1704                         Mount *mount = (Mount*) meta;
1705
1706                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1707                 }
1708
1709                 return;
1710         }
1711
1712         manager_dispatch_load_queue(m);
1713
1714         LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_MOUNT]) {
1715                 Mount *mount = (Mount*) meta;
1716
1717                 if (!mount->is_mounted) {
1718                         /* This has just been unmounted. */
1719
1720                         mount->from_proc_self_mountinfo = false;
1721
1722                         switch (mount->state) {
1723
1724                         case MOUNT_MOUNTED:
1725                                 mount_enter_dead(mount, true);
1726                                 break;
1727
1728                         default:
1729                                 mount_set_state(mount, mount->state);
1730                                 break;
1731
1732                         }
1733
1734                 } else if (mount->just_mounted || mount->just_changed) {
1735
1736                         /* New or changed mount entry */
1737
1738                         switch (mount->state) {
1739
1740                         case MOUNT_DEAD:
1741                         case MOUNT_FAILED:
1742                                 mount_enter_mounted(mount, true);
1743                                 break;
1744
1745                         case MOUNT_MOUNTING:
1746                                 mount_enter_mounting_done(mount);
1747                                 break;
1748
1749                         default:
1750                                 /* Nothing really changed, but let's
1751                                  * issue an notification call
1752                                  * nonetheless, in case somebody is
1753                                  * waiting for this. (e.g. file system
1754                                  * ro/rw remounts.) */
1755                                 mount_set_state(mount, mount->state);
1756                                 break;
1757                         }
1758                 }
1759
1760                 /* Reset the flags for later calls */
1761                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1762         }
1763 }
1764
1765 static void mount_reset_failed(Unit *u) {
1766         Mount *m = MOUNT(u);
1767
1768         assert(m);
1769
1770         if (m->state == MOUNT_FAILED)
1771                 mount_set_state(m, MOUNT_DEAD);
1772
1773         m->failure = false;
1774 }
1775
1776 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1777         Mount *m = MOUNT(u);
1778         int r = 0;
1779         Set *pid_set = NULL;
1780
1781         assert(m);
1782
1783         if (who == KILL_MAIN) {
1784                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1785                 return -ESRCH;
1786         }
1787
1788         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1789                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1790                 return -ESRCH;
1791         }
1792
1793         if (who == KILL_CONTROL || who == KILL_ALL)
1794                 if (m->control_pid > 0)
1795                         if (kill(m->control_pid, signo) < 0)
1796                                 r = -errno;
1797
1798         if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
1799                 int q;
1800
1801                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1802                         return -ENOMEM;
1803
1804                 /* Exclude the control pid from being killed via the cgroup */
1805                 if (m->control_pid > 0)
1806                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1807                                 r = q;
1808                                 goto finish;
1809                         }
1810
1811                 if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0)
1812                         if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
1813                                 r = q;
1814         }
1815
1816 finish:
1817         if (pid_set)
1818                 set_free(pid_set);
1819
1820         return r;
1821 }
1822
1823 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1824         [MOUNT_DEAD] = "dead",
1825         [MOUNT_MOUNTING] = "mounting",
1826         [MOUNT_MOUNTING_DONE] = "mounting-done",
1827         [MOUNT_MOUNTED] = "mounted",
1828         [MOUNT_REMOUNTING] = "remounting",
1829         [MOUNT_UNMOUNTING] = "unmounting",
1830         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1831         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1832         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1833         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1834         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1835         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1836         [MOUNT_FAILED] = "failed"
1837 };
1838
1839 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1840
1841 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1842         [MOUNT_EXEC_MOUNT] = "ExecMount",
1843         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1844         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1845 };
1846
1847 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1848
1849 const UnitVTable mount_vtable = {
1850         .suffix = ".mount",
1851         .sections =
1852                 "Unit\0"
1853                 "Mount\0"
1854                 "Install\0",
1855
1856         .no_alias = true,
1857         .no_instances = true,
1858         .show_status = true,
1859
1860         .init = mount_init,
1861         .load = mount_load,
1862         .done = mount_done,
1863
1864         .coldplug = mount_coldplug,
1865
1866         .dump = mount_dump,
1867
1868         .start = mount_start,
1869         .stop = mount_stop,
1870         .reload = mount_reload,
1871
1872         .kill = mount_kill,
1873
1874         .serialize = mount_serialize,
1875         .deserialize_item = mount_deserialize_item,
1876
1877         .active_state = mount_active_state,
1878         .sub_state_to_string = mount_sub_state_to_string,
1879
1880         .check_gc = mount_check_gc,
1881
1882         .sigchld_event = mount_sigchld_event,
1883         .timer_event = mount_timer_event,
1884
1885         .reset_failed = mount_reset_failed,
1886
1887         .bus_interface = "org.freedesktop.systemd1.Mount",
1888         .bus_message_handler = bus_mount_message_handler,
1889         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1890
1891         .enumerate = mount_enumerate,
1892         .shutdown = mount_shutdown
1893 };