src/mount.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <mntent.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27
  28 #include "unit.h"
  29 #include "mount.h"
  30 #include "load-fragment.h"
  31 #include "load-dropin.h"
  32 #include "log.h"
  33 #include "strv.h"
  34 #include "mount-setup.h"
  35 #include "unit-name.h"
  36 #include "dbus-mount.h"
  37 #include "special.h"
  38 #include "bus-errors.h"
  39 #include "exit-status.h"
  40 #include "def.h"
  41
  42 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  43         [MOUNT_DEAD] = UNIT_INACTIVE,
  44         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  45         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  46         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  47         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  48         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  49         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  50         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  51         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  52         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  53         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  54         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  55         [MOUNT_FAILED] = UNIT_FAILED
  56 };
  57
  58 static void mount_init(Unit *u) {
  59         Mount *m = MOUNT(u);
  60
  61         assert(u);
  62         assert(u->load_state == UNIT_STUB);
  63
  64         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  65         m->directory_mode = 0755;
  66
  67         exec_context_init(&m->exec_context);
  68
  69         /* The stdio/kmsg bridge socket is on /, in order to avoid a
  70          * dep loop, don't use kmsg logging for -.mount */
  71         if (!unit_has_name(u, "-.mount")) {
  72                 m->exec_context.std_output = u->manager->default_std_output;
  73                 m->exec_context.std_error = u->manager->default_std_error;
  74         }
  75
  76         /* We need to make sure that /bin/mount is always called in
  77          * the same process group as us, so that the autofs kernel
  78          * side doesn't send us another mount request while we are
  79          * already trying to comply its last one. */
  80         m->exec_context.same_pgrp = true;
  81
  82         m->timer_watch.type = WATCH_INVALID;
  83
  84         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  85
  86         UNIT(m)->ignore_on_isolate = true;
  87 }
  88
  89 static void mount_unwatch_control_pid(Mount *m) {
  90         assert(m);
  91
  92         if (m->control_pid <= 0)
  93                 return;
  94
  95         unit_unwatch_pid(UNIT(m), m->control_pid);
  96         m->control_pid = 0;
  97 }
  98
  99 static void mount_parameters_done(MountParameters *p) {
 100         assert(p);
 101
 102         free(p->what);
 103         free(p->options);
 104         free(p->fstype);
 105
 106         p->what = p->options = p->fstype = NULL;
 107 }
 108
 109 static void mount_done(Unit *u) {
 110         Mount *m = MOUNT(u);
 111
 112         assert(m);
 113
 114         free(m->where);
 115         m->where = NULL;
 116
 117         mount_parameters_done(&m->parameters_etc_fstab);
 118         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 119         mount_parameters_done(&m->parameters_fragment);
 120
 121         exec_context_done(&m->exec_context);
 122         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 123         m->control_command = NULL;
 124
 125         mount_unwatch_control_pid(m);
 126
 127         unit_unwatch_timer(u, &m->timer_watch);
 128 }
 129
 130 static MountParameters* get_mount_parameters_configured(Mount *m) {
 131         assert(m);
 132
 133         if (m->from_fragment)
 134                 return &m->parameters_fragment;
 135         else if (m->from_etc_fstab)
 136                 return &m->parameters_etc_fstab;
 137
 138         return NULL;
 139 }
 140
 141 static MountParameters* get_mount_parameters(Mount *m) {
 142         assert(m);
 143
 144         if (m->from_proc_self_mountinfo)
 145                 return &m->parameters_proc_self_mountinfo;
 146
 147         return get_mount_parameters_configured(m);
 148 }
 149
 150 static int mount_add_mount_links(Mount *m) {
 151         Unit *other;
 152         int r;
 153         MountParameters *pm;
 154
 155         assert(m);
 156
 157         pm = get_mount_parameters_configured(m);
 158
 159         /* Adds in links to other mount points that might lie below or
 160          * above us in the hierarchy */
 161
 162         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_MOUNT]) {
 163                 Mount *n = MOUNT(other);
 164                 MountParameters *pn;
 165
 166                 if (n == m)
 167                         continue;
 168
 169                 if (UNIT(n)->load_state != UNIT_LOADED)
 170                         continue;
 171
 172                 pn = get_mount_parameters_configured(n);
 173
 174                 if (path_startswith(m->where, n->where)) {
 175
 176                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 177                                 return r;
 178
 179                         if (pn)
 180                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 181                                         return r;
 182
 183                 } else if (path_startswith(n->where, m->where)) {
 184
 185                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 186                                 return r;
 187
 188                         if (pm)
 189                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 190                                         return r;
 191
 192                 } else if (pm && pm->what && path_startswith(pm->what, n->where)) {
 193
 194                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 195                                 return r;
 196
 197                         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 198                                 return r;
 199
 200                 } else if (pn && pn->what && path_startswith(pn->what, m->where)) {
 201
 202                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 203                                 return r;
 204
 205                         if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 206                                 return r;
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 static int mount_add_swap_links(Mount *m) {
 214         Unit *other;
 215         int r;
 216
 217         assert(m);
 218
 219         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_SWAP])
 220                 if ((r = swap_add_one_mount_link(SWAP(other), m)) < 0)
 221                         return r;
 222
 223         return 0;
 224 }
 225
 226 static int mount_add_path_links(Mount *m) {
 227         Unit *other;
 228         int r;
 229
 230         assert(m);
 231
 232         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_PATH])
 233                 if ((r = path_add_one_mount_link(PATH(other), m)) < 0)
 234                         return r;
 235
 236         return 0;
 237 }
 238
 239 static int mount_add_automount_links(Mount *m) {
 240         Unit *other;
 241         int r;
 242
 243         assert(m);
 244
 245         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_AUTOMOUNT])
 246                 if ((r = automount_add_one_mount_link(AUTOMOUNT(other), m)) < 0)
 247                         return r;
 248
 249         return 0;
 250 }
 251
 252 static int mount_add_socket_links(Mount *m) {
 253         Unit *other;
 254         int r;
 255
 256         assert(m);
 257
 258         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_SOCKET])
 259                 if ((r = socket_add_one_mount_link(SOCKET(other), m)) < 0)
 260                         return r;
 261
 262         return 0;
 263 }
 264
 265 static char* mount_test_option(const char *haystack, const char *needle) {
 266         struct mntent me;
 267
 268         assert(needle);
 269
 270         /* Like glibc's hasmntopt(), but works on a string, not a
 271          * struct mntent */
 272
 273         if (!haystack)
 274                 return NULL;
 275
 276         zero(me);
 277         me.mnt_opts = (char*) haystack;
 278
 279         return hasmntopt(&me, needle);
 280 }
 281
 282 static bool mount_is_network(MountParameters *p) {
 283         assert(p);
 284
 285         if (mount_test_option(p->options, "_netdev"))
 286                 return true;
 287
 288         if (p->fstype && fstype_is_network(p->fstype))
 289                 return true;
 290
 291         return false;
 292 }
 293
 294 static bool mount_is_bind(MountParameters *p) {
 295         assert(p);
 296
 297         if (mount_test_option(p->options, "bind"))
 298                 return true;
 299
 300         if (p->fstype && streq(p->fstype, "bind"))
 301                 return true;
 302
 303         return false;
 304 }
 305
 306 static bool needs_quota(MountParameters *p) {
 307         assert(p);
 308
 309         if (mount_is_network(p))
 310                 return false;
 311
 312         if (mount_is_bind(p))
 313                 return false;
 314
 315         return mount_test_option(p->options, "usrquota") ||
 316                 mount_test_option(p->options, "grpquota") ||
 317                 mount_test_option(p->options, "quota") ||
 318                 mount_test_option(p->options, "usrjquota") ||
 319                 mount_test_option(p->options, "grpjquota");
 320 }
 321
 322 static int mount_add_fstab_links(Mount *m) {
 323         const char *target, *after, *tu_wants = NULL;
 324         MountParameters *p;
 325         Unit *tu;
 326         int r;
 327         bool noauto, nofail, handle, automount;
 328
 329         assert(m);
 330
 331         if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
 332                 return 0;
 333
 334         if (!(p = get_mount_parameters_configured(m)))
 335                 return 0;
 336
 337         if (p != &m->parameters_etc_fstab)
 338                 return 0;
 339
 340         noauto = !!mount_test_option(p->options, "noauto");
 341         nofail = !!mount_test_option(p->options, "nofail");
 342         automount =
 343                 mount_test_option(p->options, "comment=systemd.automount") ||
 344                 mount_test_option(p->options, "x-systemd-automount");
 345         handle =
 346                 automount ||
 347                 mount_test_option(p->options, "comment=systemd.mount") ||
 348                 mount_test_option(p->options, "x-systemd-mount") ||
 349                 UNIT(m)->manager->mount_auto;
 350
 351         if (mount_is_network(p)) {
 352                 target = SPECIAL_REMOTE_FS_TARGET;
 353                 after = tu_wants = SPECIAL_REMOTE_FS_PRE_TARGET;
 354         } else {
 355                 target = SPECIAL_LOCAL_FS_TARGET;
 356                 after = SPECIAL_LOCAL_FS_PRE_TARGET;
 357         }
 358
 359         r = manager_load_unit(UNIT(m)->manager, target, NULL, NULL, &tu);
 360         if (r < 0)
 361                 return r;
 362
 363         if (tu_wants) {
 364                 r = unit_add_dependency_by_name(tu, UNIT_WANTS, tu_wants, NULL, true);
 365                 if (r < 0)
 366                         return r;
 367         }
 368
 369         if (after) {
 370                 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true);
 371                 if (r < 0)
 372                         return r;
 373         }
 374
 375         if (automount) {
 376                 Unit *am;
 377
 378                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 379                         return r;
 380
 381                 /* If auto is configured as well also pull in the
 382                  * mount right-away, but don't rely on it. */
 383                 if (!noauto) /* automount + auto */
 384                         if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 385                                 return r;
 386
 387                 /* Install automount unit */
 388                 if (!nofail) /* automount + fail */
 389                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, am, true);
 390                 else /* automount + nofail */
 391                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, am, true);
 392
 393         } else if (handle && !noauto) {
 394
 395                 /* Automatically add mount points that aren't natively
 396                  * configured to local-fs.target */
 397
 398                 if (!nofail) /* auto + fail */
 399                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
 400                 else /* auto + nofail */
 401                         return unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true);
 402         }
 403
 404         return 0;
 405 }
 406
 407 static int mount_add_device_links(Mount *m) {
 408         MountParameters *p;
 409         int r;
 410
 411         assert(m);
 412
 413         if (!(p = get_mount_parameters_configured(m)))
 414                 return 0;
 415
 416         if (!p->what)
 417                 return 0;
 418
 419         if (!mount_is_bind(p) &&
 420             !path_equal(m->where, "/") &&
 421             p == &m->parameters_etc_fstab) {
 422                 bool nofail, noauto;
 423
 424                 noauto = !!mount_test_option(p->options, "noauto");
 425                 nofail = !!mount_test_option(p->options, "nofail");
 426
 427                 if ((r = unit_add_node_link(UNIT(m), p->what,
 428                                             !noauto && nofail &&
 429                                             UNIT(m)->manager->running_as == MANAGER_SYSTEM)) < 0)
 430                         return r;
 431         }
 432
 433         if (p->passno > 0 &&
 434             !mount_is_bind(p) &&
 435             UNIT(m)->manager->running_as == MANAGER_SYSTEM &&
 436             !path_equal(m->where, "/")) {
 437                 char *name;
 438                 Unit *fsck;
 439                 /* Let's add in the fsck service */
 440
 441                 /* aka SPECIAL_FSCK_SERVICE */
 442                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 443                         return -ENOMEM;
 444
 445                 if ((r = manager_load_unit_prepare(UNIT(m)->manager, name, NULL, NULL, &fsck)) < 0) {
 446                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 447                         free(name);
 448                         return r;
 449                 }
 450
 451                 free(name);
 452
 453                 SERVICE(fsck)->fsck_passno = p->passno;
 454
 455                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 456                         return r;
 457         }
 458
 459         return 0;
 460 }
 461
 462 static int mount_add_default_dependencies(Mount *m) {
 463         int r;
 464         MountParameters *p;
 465
 466         assert(m);
 467
 468         if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
 469                 return 0;
 470
 471         p = get_mount_parameters_configured(m);
 472         if (p && needs_quota(p)) {
 473                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
 474                     (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
 475                         return r;
 476         }
 477
 478         if (!path_equal(m->where, "/"))
 479                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 480                         return r;
 481
 482         return 0;
 483 }
 484
 485 static int mount_fix_timeouts(Mount *m) {
 486         MountParameters *p;
 487         const char *timeout = NULL;
 488         Unit *other;
 489         Iterator i;
 490         usec_t u;
 491         char *t;
 492         int r;
 493
 494         assert(m);
 495
 496         if (!(p = get_mount_parameters_configured(m)))
 497                 return 0;
 498
 499         /* Allow configuration how long we wait for a device that
 500          * backs a mount point to show up. This is useful to support
 501          * endless device timeouts for devices that show up only after
 502          * user input, like crypto devices. */
 503
 504         if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
 505                 timeout += 31;
 506         else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
 507                 timeout += 25;
 508         else
 509                 return 0;
 510
 511         t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
 512         if (!t)
 513                 return -ENOMEM;
 514
 515         r = parse_usec(t, &u);
 516         free(t);
 517
 518         if (r < 0) {
 519                 log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
 520                 return r;
 521         }
 522
 523         SET_FOREACH(other, UNIT(m)->dependencies[UNIT_AFTER], i) {
 524                 if (other->type != UNIT_DEVICE)
 525                         continue;
 526
 527                 other->job_timeout = u;
 528         }
 529
 530         return 0;
 531 }
 532
 533 static int mount_verify(Mount *m) {
 534         bool b;
 535         char *e;
 536         assert(m);
 537
 538         if (UNIT(m)->load_state != UNIT_LOADED)
 539                 return 0;
 540
 541         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 542                 return -ENOENT;
 543
 544         if (!(e = unit_name_from_path(m->where, ".mount")))
 545                 return -ENOMEM;
 546
 547         b = unit_has_name(UNIT(m), e);
 548         free(e);
 549
 550         if (!b) {
 551                 log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(m)->id);
 552                 return -EINVAL;
 553         }
 554
 555         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 556                 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
 557                 return -EINVAL;
 558         }
 559
 560         if (UNIT(m)->fragment_path && !m->parameters_fragment.what) {
 561                 log_error("%s's What setting is missing. Refusing.", UNIT(m)->id);
 562                 return -EBADMSG;
 563         }
 564
 565         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 566                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(m)->id);
 567                 return -EINVAL;
 568         }
 569
 570         return 0;
 571 }
 572
 573 static int mount_load(Unit *u) {
 574         Mount *m = MOUNT(u);
 575         int r;
 576
 577         assert(u);
 578         assert(u->load_state == UNIT_STUB);
 579
 580         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 581                 return r;
 582
 583         /* This is a new unit? Then let's add in some extras */
 584         if (u->load_state == UNIT_LOADED) {
 585                 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
 586                         return r;
 587
 588                 if (UNIT(m)->fragment_path)
 589                         m->from_fragment = true;
 590                 else if (m->from_etc_fstab)
 591                         /* We always add several default dependencies to fstab mounts,
 592                          * but we do not want the implicit complementing of Wants= with After=
 593                          * in the target unit that this mount unit will be hooked into. */
 594                         UNIT(m)->default_dependencies = false;
 595
 596                 if (!m->where)
 597                         if (!(m->where = unit_name_to_path(u->id)))
 598                                 return -ENOMEM;
 599
 600                 path_kill_slashes(m->where);
 601
 602                 if (!UNIT(m)->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 (UNIT(m)->default_dependencies || m->from_etc_fstab)
 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         Iterator i;
 644
 645         assert(m);
 646
 647         SET_FOREACH(p, UNIT(m)->dependencies[UNIT_TRIGGERED_BY], i)
 648                 if (p->type == UNIT_AUTOMOUNT) {
 649                          r = automount_send_ready(AUTOMOUNT(p), status);
 650                          if (r < 0)
 651                                  return r;
 652                 }
 653
 654         return 0;
 655 }
 656
 657 static void mount_set_state(Mount *m, MountState state) {
 658         MountState old_state;
 659         assert(m);
 660
 661         old_state = m->state;
 662         m->state = state;
 663
 664         if (state != MOUNT_MOUNTING &&
 665             state != MOUNT_MOUNTING_DONE &&
 666             state != MOUNT_REMOUNTING &&
 667             state != MOUNT_UNMOUNTING &&
 668             state != MOUNT_MOUNTING_SIGTERM &&
 669             state != MOUNT_MOUNTING_SIGKILL &&
 670             state != MOUNT_UNMOUNTING_SIGTERM &&
 671             state != MOUNT_UNMOUNTING_SIGKILL &&
 672             state != MOUNT_REMOUNTING_SIGTERM &&
 673             state != MOUNT_REMOUNTING_SIGKILL) {
 674                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 675                 mount_unwatch_control_pid(m);
 676                 m->control_command = NULL;
 677                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 678         }
 679
 680         if (state == MOUNT_MOUNTED ||
 681             state == MOUNT_REMOUNTING)
 682                 mount_notify_automount(m, 0);
 683         else if (state == MOUNT_DEAD ||
 684                  state == MOUNT_UNMOUNTING ||
 685                  state == MOUNT_MOUNTING_SIGTERM ||
 686                  state == MOUNT_MOUNTING_SIGKILL ||
 687                  state == MOUNT_REMOUNTING_SIGTERM ||
 688                  state == MOUNT_REMOUNTING_SIGKILL ||
 689                  state == MOUNT_UNMOUNTING_SIGTERM ||
 690                  state == MOUNT_UNMOUNTING_SIGKILL ||
 691                  state == MOUNT_FAILED)
 692                 mount_notify_automount(m, -ENODEV);
 693
 694         if (state != old_state)
 695                 log_debug("%s changed %s -> %s",
 696                           UNIT(m)->id,
 697                           mount_state_to_string(old_state),
 698                           mount_state_to_string(state));
 699
 700         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], m->reload_result == MOUNT_SUCCESS);
 701         m->reload_result = MOUNT_SUCCESS;
 702 }
 703
 704 static int mount_coldplug(Unit *u) {
 705         Mount *m = MOUNT(u);
 706         MountState new_state = MOUNT_DEAD;
 707         int r;
 708
 709         assert(m);
 710         assert(m->state == MOUNT_DEAD);
 711
 712         if (m->deserialized_state != m->state)
 713                 new_state = m->deserialized_state;
 714         else if (m->from_proc_self_mountinfo)
 715                 new_state = MOUNT_MOUNTED;
 716
 717         if (new_state != m->state) {
 718
 719                 if (new_state == MOUNT_MOUNTING ||
 720                     new_state == MOUNT_MOUNTING_DONE ||
 721                     new_state == MOUNT_REMOUNTING ||
 722                     new_state == MOUNT_UNMOUNTING ||
 723                     new_state == MOUNT_MOUNTING_SIGTERM ||
 724                     new_state == MOUNT_MOUNTING_SIGKILL ||
 725                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 726                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 727                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 728                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 729
 730                         if (m->control_pid <= 0)
 731                                 return -EBADMSG;
 732
 733                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 734                                 return r;
 735
 736                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 737                                 return r;
 738                 }
 739
 740                 mount_set_state(m, new_state);
 741         }
 742
 743         return 0;
 744 }
 745
 746 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 747         Mount *m = MOUNT(u);
 748         MountParameters *p;
 749
 750         assert(m);
 751         assert(f);
 752
 753         p = get_mount_parameters(m);
 754
 755         fprintf(f,
 756                 "%sMount State: %s\n"
 757                 "%sResult: %s\n"
 758                 "%sWhere: %s\n"
 759                 "%sWhat: %s\n"
 760                 "%sFile System Type: %s\n"
 761                 "%sOptions: %s\n"
 762                 "%sFrom /etc/fstab: %s\n"
 763                 "%sFrom /proc/self/mountinfo: %s\n"
 764                 "%sFrom fragment: %s\n"
 765                 "%sDirectoryMode: %04o\n",
 766                 prefix, mount_state_to_string(m->state),
 767                 prefix, mount_result_to_string(m->result),
 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                             UNIT(m)->manager->environment,
 801                             true,
 802                             true,
 803                             true,
 804                             UNIT(m)->manager->confirm_spawn,
 805                             UNIT(m)->cgroup_bondings,
 806                             UNIT(m)->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, MountResult f) {
 825         assert(m);
 826
 827         if (f != MOUNT_SUCCESS)
 828                 m->result = f;
 829
 830         mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
 831 }
 832
 833 static void mount_enter_mounted(Mount *m, MountResult f) {
 834         assert(m);
 835
 836         if (f != MOUNT_SUCCESS)
 837                 m->result = f;
 838
 839         mount_set_state(m, MOUNT_MOUNTED);
 840 }
 841
 842 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
 843         int r;
 844         Set *pid_set = NULL;
 845         bool wait_for_exit = false;
 846
 847         assert(m);
 848
 849         if (f != MOUNT_SUCCESS)
 850                 m->result = f;
 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(UNIT(m)->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, MOUNT_SUCCESS);
 895         else
 896                 mount_enter_dead(m, MOUNT_SUCCESS);
 897
 898         return;
 899
 900 fail:
 901         log_warning("%s failed to kill processes: %s", UNIT(m)->id, strerror(-r));
 902
 903         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 904                 mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
 905         else
 906                 mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
 907
 908         if (pid_set)
 909                 set_free(pid_set);
 910 }
 911
 912 static void mount_enter_unmounting(Mount *m) {
 913         int r;
 914
 915         assert(m);
 916
 917         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 918         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 919
 920         if ((r = exec_command_set(
 921                              m->control_command,
 922                              "/bin/umount",
 923                              m->where,
 924                              NULL)) < 0)
 925                 goto fail;
 926
 927         mount_unwatch_control_pid(m);
 928
 929         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 930                 goto fail;
 931
 932         mount_set_state(m, MOUNT_UNMOUNTING);
 933
 934         return;
 935
 936 fail:
 937         log_warning("%s failed to run 'umount' task: %s", UNIT(m)->id, strerror(-r));
 938         mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
 939 }
 940
 941 static void mount_enter_mounting(Mount *m) {
 942         int r;
 943         MountParameters *p;
 944
 945         assert(m);
 946
 947         m->control_command_id = MOUNT_EXEC_MOUNT;
 948         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 949
 950         mkdir_p(m->where, m->directory_mode);
 951
 952         /* Create the source directory for bind-mounts if needed */
 953         p = get_mount_parameters_configured(m);
 954         if (p && mount_is_bind(p))
 955                 mkdir_p(p->what, m->directory_mode);
 956
 957         if (m->from_fragment)
 958                 r = exec_command_set(
 959                                 m->control_command,
 960                                 "/bin/mount",
 961                                 m->parameters_fragment.what,
 962                                 m->where,
 963                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 964                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 965                                 NULL);
 966         else if (m->from_etc_fstab)
 967                 r = exec_command_set(
 968                                 m->control_command,
 969                                 "/bin/mount",
 970                                 m->where,
 971                                 NULL);
 972         else
 973                 r = -ENOENT;
 974
 975         if (r < 0)
 976                 goto fail;
 977
 978         mount_unwatch_control_pid(m);
 979
 980         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 981                 goto fail;
 982
 983         mount_set_state(m, MOUNT_MOUNTING);
 984
 985         return;
 986
 987 fail:
 988         log_warning("%s failed to run 'mount' task: %s", UNIT(m)->id, strerror(-r));
 989         mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
 990 }
 991
 992 static void mount_enter_mounting_done(Mount *m) {
 993         assert(m);
 994
 995         mount_set_state(m, MOUNT_MOUNTING_DONE);
 996 }
 997
 998 static void mount_enter_remounting(Mount *m) {
 999         int r;
1000
1001         assert(m);
1002
1003         m->control_command_id = MOUNT_EXEC_REMOUNT;
1004         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1005
1006         if (m->from_fragment) {
1007                 char *buf = NULL;
1008                 const char *o;
1009
1010                 if (m->parameters_fragment.options) {
1011                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
1012                                 r = -ENOMEM;
1013                                 goto fail;
1014                         }
1015
1016                         o = buf;
1017                 } else
1018                         o = "remount";
1019
1020                 r = exec_command_set(
1021                                 m->control_command,
1022                                 "/bin/mount",
1023                                 m->parameters_fragment.what,
1024                                 m->where,
1025                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
1026                                 "-o", o,
1027                                 NULL);
1028
1029                 free(buf);
1030         } else if (m->from_etc_fstab)
1031                 r = exec_command_set(
1032                                 m->control_command,
1033                                 "/bin/mount",
1034                                 m->where,
1035                                 "-o", "remount",
1036                                 NULL);
1037         else
1038                 r = -ENOENT;
1039
1040         if (r < 0)
1041                 goto fail;
1042
1043         mount_unwatch_control_pid(m);
1044
1045         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
1046                 goto fail;
1047
1048         mount_set_state(m, MOUNT_REMOUNTING);
1049
1050         return;
1051
1052 fail:
1053         log_warning("%s failed to run 'remount' task: %s", UNIT(m)->id, strerror(-r));
1054         m->reload_result = MOUNT_FAILURE_RESOURCES;
1055         mount_enter_mounted(m, MOUNT_SUCCESS);
1056 }
1057
1058 static int mount_start(Unit *u) {
1059         Mount *m = MOUNT(u);
1060
1061         assert(m);
1062
1063         /* We cannot fulfill this request right now, try again later
1064          * please! */
1065         if (m->state == MOUNT_UNMOUNTING ||
1066             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1067             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1068             m->state == MOUNT_MOUNTING_SIGTERM ||
1069             m->state == MOUNT_MOUNTING_SIGKILL)
1070                 return -EAGAIN;
1071
1072         /* Already on it! */
1073         if (m->state == MOUNT_MOUNTING)
1074                 return 0;
1075
1076         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1077
1078         m->result = MOUNT_SUCCESS;
1079         m->reload_result = MOUNT_SUCCESS;
1080
1081         mount_enter_mounting(m);
1082         return 0;
1083 }
1084
1085 static int mount_stop(Unit *u) {
1086         Mount *m = MOUNT(u);
1087
1088         assert(m);
1089
1090         /* Already on it */
1091         if (m->state == MOUNT_UNMOUNTING ||
1092             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1093             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1094             m->state == MOUNT_MOUNTING_SIGTERM ||
1095             m->state == MOUNT_MOUNTING_SIGKILL)
1096                 return 0;
1097
1098         assert(m->state == MOUNT_MOUNTING ||
1099                m->state == MOUNT_MOUNTING_DONE ||
1100                m->state == MOUNT_MOUNTED ||
1101                m->state == MOUNT_REMOUNTING ||
1102                m->state == MOUNT_REMOUNTING_SIGTERM ||
1103                m->state == MOUNT_REMOUNTING_SIGKILL);
1104
1105         mount_enter_unmounting(m);
1106         return 0;
1107 }
1108
1109 static int mount_reload(Unit *u) {
1110         Mount *m = MOUNT(u);
1111
1112         assert(m);
1113
1114         if (m->state == MOUNT_MOUNTING_DONE)
1115                 return -EAGAIN;
1116
1117         assert(m->state == MOUNT_MOUNTED);
1118
1119         mount_enter_remounting(m);
1120         return 0;
1121 }
1122
1123 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1124         Mount *m = MOUNT(u);
1125
1126         assert(m);
1127         assert(f);
1128         assert(fds);
1129
1130         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1131         unit_serialize_item(u, f, "result", mount_result_to_string(m->result));
1132         unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
1133
1134         if (m->control_pid > 0)
1135                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1136
1137         if (m->control_command_id >= 0)
1138                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1139
1140         return 0;
1141 }
1142
1143 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1144         Mount *m = MOUNT(u);
1145
1146         assert(u);
1147         assert(key);
1148         assert(value);
1149         assert(fds);
1150
1151         if (streq(key, "state")) {
1152                 MountState state;
1153
1154                 if ((state = mount_state_from_string(value)) < 0)
1155                         log_debug("Failed to parse state value %s", value);
1156                 else
1157                         m->deserialized_state = state;
1158         } else if (streq(key, "result")) {
1159                 MountResult f;
1160
1161                 f = mount_result_from_string(value);
1162                 if (f < 0)
1163                         log_debug("Failed to parse result value %s", value);
1164                 else if (f != MOUNT_SUCCESS)
1165                         m->result = f;
1166
1167         } else if (streq(key, "reload-result")) {
1168                 MountResult f;
1169
1170                 f = mount_result_from_string(value);
1171                 if (f < 0)
1172                         log_debug("Failed to parse reload result value %s", value);
1173                 else if (f != MOUNT_SUCCESS)
1174                         m->reload_result = f;
1175
1176         } else if (streq(key, "control-pid")) {
1177                 pid_t pid;
1178
1179                 if (parse_pid(value, &pid) < 0)
1180                         log_debug("Failed to parse control-pid value %s", value);
1181                 else
1182                         m->control_pid = pid;
1183         } else if (streq(key, "control-command")) {
1184                 MountExecCommand id;
1185
1186                 if ((id = mount_exec_command_from_string(value)) < 0)
1187                         log_debug("Failed to parse exec-command value %s", value);
1188                 else {
1189                         m->control_command_id = id;
1190                         m->control_command = m->exec_command + id;
1191                 }
1192
1193         } else
1194                 log_debug("Unknown serialization key '%s'", key);
1195
1196         return 0;
1197 }
1198
1199 static UnitActiveState mount_active_state(Unit *u) {
1200         assert(u);
1201
1202         return state_translation_table[MOUNT(u)->state];
1203 }
1204
1205 static const char *mount_sub_state_to_string(Unit *u) {
1206         assert(u);
1207
1208         return mount_state_to_string(MOUNT(u)->state);
1209 }
1210
1211 static bool mount_check_gc(Unit *u) {
1212         Mount *m = MOUNT(u);
1213
1214         assert(m);
1215
1216         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1217 }
1218
1219 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1220         Mount *m = MOUNT(u);
1221         MountResult f;
1222
1223         assert(m);
1224         assert(pid >= 0);
1225
1226         if (pid != m->control_pid)
1227                 return;
1228
1229         m->control_pid = 0;
1230
1231         if (is_clean_exit(code, status))
1232                 f = MOUNT_SUCCESS;
1233         else if (code == CLD_EXITED)
1234                 f = MOUNT_FAILURE_EXIT_CODE;
1235         else if (code == CLD_KILLED)
1236                 f = MOUNT_FAILURE_SIGNAL;
1237         else if (code == CLD_DUMPED)
1238                 f = MOUNT_FAILURE_CORE_DUMP;
1239         else
1240                 assert_not_reached("Unknown code");
1241
1242         if (f != MOUNT_SUCCESS)
1243                 m->result = f;
1244
1245         if (m->control_command) {
1246                 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1247
1248                 m->control_command = NULL;
1249                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1250         }
1251
1252         log_full(f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1253                  "%s mount process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
1254
1255         /* Note that mount(8) returning and the kernel sending us a
1256          * mount table change event might happen out-of-order. If an
1257          * operation succeed we assume the kernel will follow soon too
1258          * and already change into the resulting state.  If it fails
1259          * we check if the kernel still knows about the mount. and
1260          * change state accordingly. */
1261
1262         switch (m->state) {
1263
1264         case MOUNT_MOUNTING:
1265         case MOUNT_MOUNTING_DONE:
1266         case MOUNT_MOUNTING_SIGKILL:
1267         case MOUNT_MOUNTING_SIGTERM:
1268
1269                 if (f == MOUNT_SUCCESS)
1270                         mount_enter_mounted(m, f);
1271                 else if (m->from_proc_self_mountinfo)
1272                         mount_enter_mounted(m, f);
1273                 else
1274                         mount_enter_dead(m, f);
1275                 break;
1276
1277         case MOUNT_REMOUNTING:
1278         case MOUNT_REMOUNTING_SIGKILL:
1279         case MOUNT_REMOUNTING_SIGTERM:
1280
1281                 m->reload_result = f;
1282                 if (m->from_proc_self_mountinfo)
1283                         mount_enter_mounted(m, MOUNT_SUCCESS);
1284                 else
1285                         mount_enter_dead(m, MOUNT_SUCCESS);
1286
1287                 break;
1288
1289         case MOUNT_UNMOUNTING:
1290         case MOUNT_UNMOUNTING_SIGKILL:
1291         case MOUNT_UNMOUNTING_SIGTERM:
1292
1293                 if (f == MOUNT_SUCCESS)
1294                         mount_enter_dead(m, f);
1295                 else if (m->from_proc_self_mountinfo)
1296                         mount_enter_mounted(m, f);
1297                 else
1298                         mount_enter_dead(m, f);
1299                 break;
1300
1301         default:
1302                 assert_not_reached("Uh, control process died at wrong time.");
1303         }
1304
1305         /* Notify clients about changed exit status */
1306         unit_add_to_dbus_queue(u);
1307 }
1308
1309 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1310         Mount *m = MOUNT(u);
1311
1312         assert(m);
1313         assert(elapsed == 1);
1314         assert(w == &m->timer_watch);
1315
1316         switch (m->state) {
1317
1318         case MOUNT_MOUNTING:
1319         case MOUNT_MOUNTING_DONE:
1320                 log_warning("%s mounting timed out. Stopping.", u->id);
1321                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1322                 break;
1323
1324         case MOUNT_REMOUNTING:
1325                 log_warning("%s remounting timed out. Stopping.", u->id);
1326                 m->reload_result = MOUNT_FAILURE_TIMEOUT;
1327                 mount_enter_mounted(m, MOUNT_SUCCESS);
1328                 break;
1329
1330         case MOUNT_UNMOUNTING:
1331                 log_warning("%s unmounting timed out. Stopping.", u->id);
1332                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1333                 break;
1334
1335         case MOUNT_MOUNTING_SIGTERM:
1336                 if (m->exec_context.send_sigkill) {
1337                         log_warning("%s mounting timed out. Killing.", u->id);
1338                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1339                 } else {
1340                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->id);
1341
1342                         if (m->from_proc_self_mountinfo)
1343                                 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1344                         else
1345                                 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1346                 }
1347                 break;
1348
1349         case MOUNT_REMOUNTING_SIGTERM:
1350                 if (m->exec_context.send_sigkill) {
1351                         log_warning("%s remounting timed out. Killing.", u->id);
1352                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1353                 } else {
1354                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->id);
1355
1356                         if (m->from_proc_self_mountinfo)
1357                                 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1358                         else
1359                                 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1360                 }
1361                 break;
1362
1363         case MOUNT_UNMOUNTING_SIGTERM:
1364                 if (m->exec_context.send_sigkill) {
1365                         log_warning("%s unmounting timed out. Killing.", u->id);
1366                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1367                 } else {
1368                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->id);
1369
1370                         if (m->from_proc_self_mountinfo)
1371                                 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1372                         else
1373                                 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1374                 }
1375                 break;
1376
1377         case MOUNT_MOUNTING_SIGKILL:
1378         case MOUNT_REMOUNTING_SIGKILL:
1379         case MOUNT_UNMOUNTING_SIGKILL:
1380                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->id);
1381
1382                 if (m->from_proc_self_mountinfo)
1383                         mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1384                 else
1385                         mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1386                 break;
1387
1388         default:
1389                 assert_not_reached("Timeout at wrong time.");
1390         }
1391 }
1392
1393 static int mount_add_one(
1394                 Manager *m,
1395                 const char *what,
1396                 const char *where,
1397                 const char *options,
1398                 const char *fstype,
1399                 int passno,
1400                 bool from_proc_self_mountinfo,
1401                 bool set_flags) {
1402         int r;
1403         Unit *u;
1404         bool delete;
1405         char *e, *w = NULL, *o = NULL, *f = NULL;
1406         MountParameters *p;
1407
1408         assert(m);
1409         assert(what);
1410         assert(where);
1411         assert(options);
1412         assert(fstype);
1413
1414         assert(!set_flags || from_proc_self_mountinfo);
1415
1416         /* Ignore API mount points. They should never be referenced in
1417          * dependencies ever. */
1418         if (mount_point_is_api(where) || mount_point_ignore(where))
1419                 return 0;
1420
1421         if (streq(fstype, "autofs"))
1422                 return 0;
1423
1424         /* probably some kind of swap, ignore */
1425         if (!is_path(where))
1426                 return 0;
1427
1428         e = unit_name_from_path(where, ".mount");
1429         if (!e)
1430                 return -ENOMEM;
1431
1432         u = manager_get_unit(m, e);
1433         if (!u) {
1434                 delete = true;
1435
1436                 u = unit_new(m, sizeof(Mount));
1437                 if (!u) {
1438                         free(e);
1439                         return -ENOMEM;
1440                 }
1441
1442                 r = unit_add_name(u, e);
1443                 free(e);
1444
1445                 if (r < 0)
1446                         goto fail;
1447
1448                 MOUNT(u)->where = strdup(where);
1449                 if (!MOUNT(u)->where) {
1450                         r = -ENOMEM;
1451                         goto fail;
1452                 }
1453
1454                 unit_add_to_load_queue(u);
1455         } else {
1456                 delete = false;
1457                 free(e);
1458         }
1459
1460         if (!(w = strdup(what)) ||
1461             !(o = strdup(options)) ||
1462             !(f = strdup(fstype))) {
1463                 r = -ENOMEM;
1464                 goto fail;
1465         }
1466
1467         if (from_proc_self_mountinfo) {
1468                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1469
1470                 if (set_flags) {
1471                         MOUNT(u)->is_mounted = true;
1472                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1473                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1474                 }
1475
1476                 MOUNT(u)->from_proc_self_mountinfo = true;
1477         } else {
1478                 p = &MOUNT(u)->parameters_etc_fstab;
1479                 MOUNT(u)->from_etc_fstab = true;
1480         }
1481
1482         free(p->what);
1483         p->what = w;
1484
1485         free(p->options);
1486         p->options = o;
1487
1488         free(p->fstype);
1489         p->fstype = f;
1490
1491         p->passno = passno;
1492
1493         unit_add_to_dbus_queue(u);
1494
1495         return 0;
1496
1497 fail:
1498         free(w);
1499         free(o);
1500         free(f);
1501
1502         if (delete && u)
1503                 unit_free(u);
1504
1505         return r;
1506 }
1507
1508 static int mount_find_pri(char *options) {
1509         char *end, *pri;
1510         unsigned long r;
1511
1512         if (!(pri = mount_test_option(options, "pri")))
1513                 return 0;
1514
1515         pri += 4;
1516
1517         errno = 0;
1518         r = strtoul(pri, &end, 10);
1519
1520         if (errno != 0)
1521                 return -errno;
1522
1523         if (end == pri || (*end != ',' && *end != 0))
1524                 return -EINVAL;
1525
1526         return (int) r;
1527 }
1528
1529 static int mount_load_etc_fstab(Manager *m) {
1530         FILE *f;
1531         int r = 0;
1532         struct mntent* me;
1533
1534         assert(m);
1535
1536         errno = 0;
1537         if (!(f = setmntent("/etc/fstab", "r")))
1538                 return -errno;
1539
1540         while ((me = getmntent(f))) {
1541                 char *where, *what;
1542                 int k;
1543
1544                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1545                         r = -ENOMEM;
1546                         goto finish;
1547                 }
1548
1549                 if (!(where = strdup(me->mnt_dir))) {
1550                         free(what);
1551                         r = -ENOMEM;
1552                         goto finish;
1553                 }
1554
1555                 if (what[0] == '/')
1556                         path_kill_slashes(what);
1557
1558                 if (where[0] == '/')
1559                         path_kill_slashes(where);
1560
1561                 if (streq(me->mnt_type, "swap")) {
1562                         int pri;
1563
1564                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1565                                 k = pri;
1566                         else
1567                                 k = swap_add_one(m,
1568                                                  what,
1569                                                  NULL,
1570                                                  pri,
1571                                                  !!mount_test_option(me->mnt_opts, "noauto"),
1572                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1573                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1574                                                  false);
1575                 } else
1576                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1577
1578                 free(what);
1579                 free(where);
1580
1581                 if (k < 0)
1582                         r = k;
1583         }
1584
1585 finish:
1586
1587         endmntent(f);
1588         return r;
1589 }
1590
1591 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1592         int r = 0;
1593         unsigned i;
1594         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1595
1596         assert(m);
1597
1598         rewind(m->proc_self_mountinfo);
1599
1600         for (i = 1;; i++) {
1601                 int k;
1602
1603                 device = path = options = options2 = fstype = d = p = o = NULL;
1604
1605                 if ((k = fscanf(m->proc_self_mountinfo,
1606                                 "%*s "       /* (1) mount id */
1607                                 "%*s "       /* (2) parent id */
1608                                 "%*s "       /* (3) major:minor */
1609                                 "%*s "       /* (4) root */
1610                                 "%ms "       /* (5) mount point */
1611                                 "%ms"        /* (6) mount options */
1612                                 "%*[^-]"     /* (7) optional fields */
1613                                 "- "         /* (8) separator */
1614                                 "%ms "       /* (9) file system type */
1615                                 "%ms"        /* (10) mount source */
1616                                 "%ms"        /* (11) mount options 2 */
1617                                 "%*[^\n]",   /* some rubbish at the end */
1618                                 &path,
1619                                 &options,
1620                                 &fstype,
1621                                 &device,
1622                                 &options2)) != 5) {
1623
1624                         if (k == EOF)
1625                                 break;
1626
1627                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1628                         goto clean_up;
1629                 }
1630
1631                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1632                         r = -ENOMEM;
1633                         goto finish;
1634                 }
1635
1636                 if (!(d = cunescape(device)) ||
1637                     !(p = cunescape(path))) {
1638                         r = -ENOMEM;
1639                         goto finish;
1640                 }
1641
1642                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1643                         r = k;
1644
1645 clean_up:
1646                 free(device);
1647                 free(path);
1648                 free(options);
1649                 free(options2);
1650                 free(fstype);
1651                 free(d);
1652                 free(p);
1653                 free(o);
1654         }
1655
1656 finish:
1657         free(device);
1658         free(path);
1659         free(options);
1660         free(options2);
1661         free(fstype);
1662         free(d);
1663         free(p);
1664         free(o);
1665
1666         return r;
1667 }
1668
1669 static void mount_shutdown(Manager *m) {
1670         assert(m);
1671
1672         if (m->proc_self_mountinfo) {
1673                 fclose(m->proc_self_mountinfo);
1674                 m->proc_self_mountinfo = NULL;
1675         }
1676 }
1677
1678 static int mount_enumerate(Manager *m) {
1679         int r;
1680         struct epoll_event ev;
1681         assert(m);
1682
1683         if (!m->proc_self_mountinfo) {
1684                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1685                         return -errno;
1686
1687                 m->mount_watch.type = WATCH_MOUNT;
1688                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1689
1690                 zero(ev);
1691                 ev.events = EPOLLPRI;
1692                 ev.data.ptr = &m->mount_watch;
1693
1694                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1695                         return -errno;
1696         }
1697
1698         if ((r = mount_load_etc_fstab(m)) < 0)
1699                 goto fail;
1700
1701         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1702                 goto fail;
1703
1704         return 0;
1705
1706 fail:
1707         mount_shutdown(m);
1708         return r;
1709 }
1710
1711 void mount_fd_event(Manager *m, int events) {
1712         Unit *u;
1713         int r;
1714
1715         assert(m);
1716         assert(events & EPOLLPRI);
1717
1718         /* The manager calls this for every fd event happening on the
1719          * /proc/self/mountinfo file, which informs us about mounting
1720          * table changes */
1721
1722         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1723                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1724
1725                 /* Reset flags, just in case, for later calls */
1726                 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1727                         Mount *mount = MOUNT(u);
1728
1729                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1730                 }
1731
1732                 return;
1733         }
1734
1735         manager_dispatch_load_queue(m);
1736
1737         LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1738                 Mount *mount = MOUNT(u);
1739
1740                 if (!mount->is_mounted) {
1741                         /* This has just been unmounted. */
1742
1743                         mount->from_proc_self_mountinfo = false;
1744
1745                         switch (mount->state) {
1746
1747                         case MOUNT_MOUNTED:
1748                                 mount_enter_dead(mount, MOUNT_SUCCESS);
1749                                 break;
1750
1751                         default:
1752                                 mount_set_state(mount, mount->state);
1753                                 break;
1754
1755                         }
1756
1757                 } else if (mount->just_mounted || mount->just_changed) {
1758
1759                         /* New or changed mount entry */
1760
1761                         switch (mount->state) {
1762
1763                         case MOUNT_DEAD:
1764                         case MOUNT_FAILED:
1765                                 mount_enter_mounted(mount, MOUNT_SUCCESS);
1766                                 break;
1767
1768                         case MOUNT_MOUNTING:
1769                                 mount_enter_mounting_done(mount);
1770                                 break;
1771
1772                         default:
1773                                 /* Nothing really changed, but let's
1774                                  * issue an notification call
1775                                  * nonetheless, in case somebody is
1776                                  * waiting for this. (e.g. file system
1777                                  * ro/rw remounts.) */
1778                                 mount_set_state(mount, mount->state);
1779                                 break;
1780                         }
1781                 }
1782
1783                 /* Reset the flags for later calls */
1784                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1785         }
1786 }
1787
1788 static void mount_reset_failed(Unit *u) {
1789         Mount *m = MOUNT(u);
1790
1791         assert(m);
1792
1793         if (m->state == MOUNT_FAILED)
1794                 mount_set_state(m, MOUNT_DEAD);
1795
1796         m->result = MOUNT_SUCCESS;
1797         m->reload_result = MOUNT_SUCCESS;
1798 }
1799
1800 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1801         Mount *m = MOUNT(u);
1802         int r = 0;
1803         Set *pid_set = NULL;
1804
1805         assert(m);
1806
1807         if (who == KILL_MAIN) {
1808                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1809                 return -ESRCH;
1810         }
1811
1812         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1813                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1814                 return -ESRCH;
1815         }
1816
1817         if (who == KILL_CONTROL || who == KILL_ALL)
1818                 if (m->control_pid > 0)
1819                         if (kill(m->control_pid, signo) < 0)
1820                                 r = -errno;
1821
1822         if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
1823                 int q;
1824
1825                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1826                         return -ENOMEM;
1827
1828                 /* Exclude the control pid from being killed via the cgroup */
1829                 if (m->control_pid > 0)
1830                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1831                                 r = q;
1832                                 goto finish;
1833                         }
1834
1835                 if ((q = cgroup_bonding_kill_list(UNIT(m)->cgroup_bondings, signo, false, pid_set)) < 0)
1836                         if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
1837                                 r = q;
1838         }
1839
1840 finish:
1841         if (pid_set)
1842                 set_free(pid_set);
1843
1844         return r;
1845 }
1846
1847 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1848         [MOUNT_DEAD] = "dead",
1849         [MOUNT_MOUNTING] = "mounting",
1850         [MOUNT_MOUNTING_DONE] = "mounting-done",
1851         [MOUNT_MOUNTED] = "mounted",
1852         [MOUNT_REMOUNTING] = "remounting",
1853         [MOUNT_UNMOUNTING] = "unmounting",
1854         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1855         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1856         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1857         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1858         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1859         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1860         [MOUNT_FAILED] = "failed"
1861 };
1862
1863 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1864
1865 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1866         [MOUNT_EXEC_MOUNT] = "ExecMount",
1867         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1868         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1869 };
1870
1871 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1872
1873 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1874         [MOUNT_SUCCESS] = "success",
1875         [MOUNT_FAILURE_RESOURCES] = "resources",
1876         [MOUNT_FAILURE_TIMEOUT] = "timeout",
1877         [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1878         [MOUNT_FAILURE_SIGNAL] = "signal",
1879         [MOUNT_FAILURE_CORE_DUMP] = "core-dump"
1880 };
1881
1882 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1883
1884 const UnitVTable mount_vtable = {
1885         .suffix = ".mount",
1886         .object_size = sizeof(Mount),
1887         .sections =
1888                 "Unit\0"
1889                 "Mount\0"
1890                 "Install\0",
1891
1892         .no_alias = true,
1893         .no_instances = true,
1894         .show_status = true,
1895
1896         .init = mount_init,
1897         .load = mount_load,
1898         .done = mount_done,
1899
1900         .coldplug = mount_coldplug,
1901
1902         .dump = mount_dump,
1903
1904         .start = mount_start,
1905         .stop = mount_stop,
1906         .reload = mount_reload,
1907
1908         .kill = mount_kill,
1909
1910         .serialize = mount_serialize,
1911         .deserialize_item = mount_deserialize_item,
1912
1913         .active_state = mount_active_state,
1914         .sub_state_to_string = mount_sub_state_to_string,
1915
1916         .check_gc = mount_check_gc,
1917
1918         .sigchld_event = mount_sigchld_event,
1919         .timer_event = mount_timer_event,
1920
1921         .reset_failed = mount_reset_failed,
1922
1923         .bus_interface = "org.freedesktop.systemd1.Mount",
1924         .bus_message_handler = bus_mount_message_handler,
1925         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1926
1927         .enumerate = mount_enumerate,
1928         .shutdown = mount_shutdown
1929 };