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 "mount.h"
  37 #include "dbus-mount.h"
  38 #include "special.h"
  39
  40 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  41         [MOUNT_DEAD] = UNIT_INACTIVE,
  42         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  43         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  44         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  45         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  46         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  47         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  48         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  49         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  50         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  51         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  52         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  53         [MOUNT_FAILED] = UNIT_FAILED
  54 };
  55
  56 static void mount_init(Unit *u) {
  57         Mount *m = MOUNT(u);
  58
  59         assert(u);
  60         assert(u->meta.load_state == UNIT_STUB);
  61
  62         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  63         m->directory_mode = 0755;
  64
  65         exec_context_init(&m->exec_context);
  66
  67         /* We need to make sure that /bin/mount is always called in
  68          * the same process group as us, so that the autofs kernel
  69          * side doesn't send us another mount request while we are
  70          * already trying to comply its last one. */
  71         m->exec_context.same_pgrp = true;
  72
  73         m->timer_watch.type = WATCH_INVALID;
  74
  75         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  76 }
  77
  78 static void mount_unwatch_control_pid(Mount *m) {
  79         assert(m);
  80
  81         if (m->control_pid <= 0)
  82                 return;
  83
  84         unit_unwatch_pid(UNIT(m), m->control_pid);
  85         m->control_pid = 0;
  86 }
  87
  88 static void mount_parameters_done(MountParameters *p) {
  89         assert(p);
  90
  91         free(p->what);
  92         free(p->options);
  93         free(p->fstype);
  94
  95         p->what = p->options = p->fstype = NULL;
  96 }
  97
  98 static void mount_done(Unit *u) {
  99         Mount *m = MOUNT(u);
 100
 101         assert(m);
 102
 103         free(m->where);
 104         m->where = NULL;
 105
 106         mount_parameters_done(&m->parameters_etc_fstab);
 107         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 108         mount_parameters_done(&m->parameters_fragment);
 109
 110         exec_context_done(&m->exec_context);
 111         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 112         m->control_command = NULL;
 113
 114         mount_unwatch_control_pid(m);
 115
 116         unit_unwatch_timer(u, &m->timer_watch);
 117 }
 118
 119 static int mount_add_mount_links(Mount *m) {
 120         Meta *other;
 121         int r;
 122
 123         assert(m);
 124
 125         /* Adds in links to other mount points that might lie below or
 126          * above us in the hierarchy */
 127
 128         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) {
 129                 Mount *n = (Mount*) other;
 130
 131                 if (n == m)
 132                         continue;
 133
 134                 if (n->meta.load_state != UNIT_LOADED)
 135                         continue;
 136
 137                 if (path_startswith(m->where, n->where)) {
 138
 139                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 140                                 return r;
 141
 142                         if (n->from_etc_fstab || n->from_fragment)
 143                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 144                                         return r;
 145
 146                 } else if (path_startswith(n->where, m->where)) {
 147
 148                         if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(n), true)) < 0)
 149                                 return r;
 150
 151                         if (m->from_etc_fstab || m->from_fragment)
 152                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 153                                         return r;
 154                 }
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int mount_add_swap_links(Mount *m) {
 161         Meta *other;
 162         int r;
 163
 164         assert(m);
 165
 166         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP])
 167                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 168                         return r;
 169
 170         return 0;
 171 }
 172
 173 static int mount_add_path_links(Mount *m) {
 174         Meta *other;
 175         int r;
 176
 177         assert(m);
 178
 179         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH])
 180                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 181                         return r;
 182
 183         return 0;
 184 }
 185
 186 static int mount_add_automount_links(Mount *m) {
 187         Meta *other;
 188         int r;
 189
 190         assert(m);
 191
 192         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT])
 193                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 194                         return r;
 195
 196         return 0;
 197 }
 198
 199 static int mount_add_socket_links(Mount *m) {
 200         Meta *other;
 201         int r;
 202
 203         assert(m);
 204
 205         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET])
 206                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 207                         return r;
 208
 209         return 0;
 210 }
 211
 212 static char* mount_test_option(const char *haystack, const char *needle) {
 213         struct mntent me;
 214
 215         assert(needle);
 216
 217         /* Like glibc's hasmntopt(), but works on a string, not a
 218          * struct mntent */
 219
 220         if (!haystack)
 221                 return false;
 222
 223         zero(me);
 224         me.mnt_opts = (char*) haystack;
 225
 226         return hasmntopt(&me, needle);
 227 }
 228
 229 static int mount_add_target_links(Mount *m) {
 230         const char *target;
 231         MountParameters *p;
 232         Unit *tu;
 233         int r;
 234         bool noauto, handle, automount, user;
 235
 236         assert(m);
 237
 238         if (m->from_fragment)
 239                 p = &m->parameters_fragment;
 240         else if (m->from_etc_fstab)
 241                 p = &m->parameters_etc_fstab;
 242         else
 243                 return 0;
 244
 245         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 246         user = mount_test_option(p->options, "user") || mount_test_option(p->options, "users");
 247         handle = !!mount_test_option(p->options, "comment=systemd.mount") ||
 248                 m->meta.manager->mount_auto;
 249         automount = !!mount_test_option(p->options, "comment=systemd.automount");
 250
 251         if (mount_test_option(p->options, "_netdev") ||
 252             fstype_is_network(p->fstype))
 253                 target = SPECIAL_REMOTE_FS_TARGET;
 254         else
 255                 target = SPECIAL_LOCAL_FS_TARGET;
 256
 257         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 258                 return r;
 259
 260         if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) {
 261                 Unit *am;
 262
 263                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 264                         return r;
 265
 266                 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 267         } else {
 268
 269                 /* Automatically add mount points that aren't natively
 270                  * configured to local-fs.target */
 271                 if (!noauto &&
 272                     handle &&
 273                     !m->from_fragment)
 274                         if (user || m->meta.manager->running_as == MANAGER_SYSTEM)
 275                                 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 276                                         return r;
 277
 278                 return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true);
 279         }
 280 }
 281
 282 static int mount_add_device_links(Mount *m) {
 283         MountParameters *p;
 284         bool nofail, noauto;
 285
 286         assert(m);
 287
 288         if (m->from_fragment)
 289                 p = &m->parameters_fragment;
 290         else if (m->from_etc_fstab)
 291                 p = &m->parameters_etc_fstab;
 292         else
 293                 return 0;
 294
 295         if (!p->what || path_equal(m->where, "/"))
 296                 return 0;
 297
 298         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 299         nofail = !!mount_test_option(p->options, "nofail");
 300
 301         return unit_add_node_link(UNIT(m), p->what,
 302                                   !noauto && nofail &&
 303                                   UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM);
 304 }
 305
 306 static int mount_add_default_dependencies(Mount *m) {
 307         int r;
 308
 309         assert(m);
 310
 311         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 312             !path_equal(m->where, "/")) {
 313
 314                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_FSCK_TARGET, NULL, true)) < 0)
 315                         return r;
 316
 317                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 318                         return r;
 319         }
 320
 321         return 0;
 322 }
 323
 324 static int mount_verify(Mount *m) {
 325         bool b;
 326         char *e;
 327         assert(m);
 328
 329         if (m->meta.load_state != UNIT_LOADED)
 330                 return 0;
 331
 332         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 333                 return -ENOENT;
 334
 335         if (!(e = unit_name_from_path(m->where, ".mount")))
 336                 return -ENOMEM;
 337
 338         b = unit_has_name(UNIT(m), e);
 339         free(e);
 340
 341         if (!b) {
 342                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 343                 return -EINVAL;
 344         }
 345
 346         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 347                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 348                 return -EBADMSG;
 349         }
 350
 351         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 352                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 353                 return -EINVAL;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int mount_load(Unit *u) {
 360         Mount *m = MOUNT(u);
 361         int r;
 362
 363         assert(u);
 364         assert(u->meta.load_state == UNIT_STUB);
 365
 366         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 367                 return r;
 368
 369         /* This is a new unit? Then let's add in some extras */
 370         if (u->meta.load_state == UNIT_LOADED) {
 371                 const char *what = NULL;
 372
 373                 if (m->meta.fragment_path)
 374                         m->from_fragment = true;
 375
 376                 if (!m->where)
 377                         if (!(m->where = unit_name_to_path(u->meta.id)))
 378                                 return -ENOMEM;
 379
 380                 path_kill_slashes(m->where);
 381
 382                 if (!m->meta.description)
 383                         if ((r = unit_set_description(u, m->where)) < 0)
 384                                 return r;
 385
 386                 if (m->from_fragment && m->parameters_fragment.what)
 387                         what = m->parameters_fragment.what;
 388                 else if (m->from_etc_fstab && m->parameters_etc_fstab.what)
 389                         what = m->parameters_etc_fstab.what;
 390                 else if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.what)
 391                         what = m->parameters_proc_self_mountinfo.what;
 392
 393                 if ((r = mount_add_device_links(m)) < 0)
 394                         return r;
 395
 396                 if ((r = mount_add_mount_links(m)) < 0)
 397                         return r;
 398
 399                 if ((r = mount_add_socket_links(m)) < 0)
 400                         return r;
 401
 402                 if ((r = mount_add_swap_links(m)) < 0)
 403                         return r;
 404
 405                 if ((r = mount_add_path_links(m)) < 0)
 406                         return r;
 407
 408                 if ((r = mount_add_automount_links(m)) < 0)
 409                         return r;
 410
 411                 if ((r = mount_add_target_links(m)) < 0)
 412                         return r;
 413
 414                 if ((r = unit_add_default_cgroup(u)) < 0)
 415                         return r;
 416
 417                 if (m->meta.default_dependencies)
 418                         if ((r = mount_add_default_dependencies(m)) < 0)
 419                                 return r;
 420         }
 421
 422         return mount_verify(m);
 423 }
 424
 425 static int mount_notify_automount(Mount *m, int status) {
 426         Unit *p;
 427         int r;
 428
 429         assert(m);
 430
 431         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 432                 return r == -ENOENT ? 0 : r;
 433
 434         return automount_send_ready(AUTOMOUNT(p), status);
 435 }
 436
 437 static void mount_set_state(Mount *m, MountState state) {
 438         MountState old_state;
 439         assert(m);
 440
 441         old_state = m->state;
 442         m->state = state;
 443
 444         if (state != MOUNT_MOUNTING &&
 445             state != MOUNT_MOUNTING_DONE &&
 446             state != MOUNT_REMOUNTING &&
 447             state != MOUNT_UNMOUNTING &&
 448             state != MOUNT_MOUNTING_SIGTERM &&
 449             state != MOUNT_MOUNTING_SIGKILL &&
 450             state != MOUNT_UNMOUNTING_SIGTERM &&
 451             state != MOUNT_UNMOUNTING_SIGKILL &&
 452             state != MOUNT_REMOUNTING_SIGTERM &&
 453             state != MOUNT_REMOUNTING_SIGKILL) {
 454                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 455                 mount_unwatch_control_pid(m);
 456                 m->control_command = NULL;
 457                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 458         }
 459
 460         if (state == MOUNT_MOUNTED ||
 461             state == MOUNT_REMOUNTING)
 462                 mount_notify_automount(m, 0);
 463         else if (state == MOUNT_DEAD ||
 464                  state == MOUNT_UNMOUNTING ||
 465                  state == MOUNT_MOUNTING_SIGTERM ||
 466                  state == MOUNT_MOUNTING_SIGKILL ||
 467                  state == MOUNT_REMOUNTING_SIGTERM ||
 468                  state == MOUNT_REMOUNTING_SIGKILL ||
 469                  state == MOUNT_UNMOUNTING_SIGTERM ||
 470                  state == MOUNT_UNMOUNTING_SIGKILL ||
 471                  state == MOUNT_FAILED)
 472                 mount_notify_automount(m, -ENODEV);
 473
 474         if (state != old_state)
 475                 log_debug("%s changed %s -> %s",
 476                           m->meta.id,
 477                           mount_state_to_string(old_state),
 478                           mount_state_to_string(state));
 479
 480         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 481 }
 482
 483 static int mount_coldplug(Unit *u) {
 484         Mount *m = MOUNT(u);
 485         MountState new_state = MOUNT_DEAD;
 486         int r;
 487
 488         assert(m);
 489         assert(m->state == MOUNT_DEAD);
 490
 491         if (m->deserialized_state != m->state)
 492                 new_state = m->deserialized_state;
 493         else if (m->from_proc_self_mountinfo)
 494                 new_state = MOUNT_MOUNTED;
 495
 496         if (new_state != m->state) {
 497
 498                 if (new_state == MOUNT_MOUNTING ||
 499                     new_state == MOUNT_MOUNTING_DONE ||
 500                     new_state == MOUNT_REMOUNTING ||
 501                     new_state == MOUNT_UNMOUNTING ||
 502                     new_state == MOUNT_MOUNTING_SIGTERM ||
 503                     new_state == MOUNT_MOUNTING_SIGKILL ||
 504                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 505                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 506                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 507                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 508
 509                         if (m->control_pid <= 0)
 510                                 return -EBADMSG;
 511
 512                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 513                                 return r;
 514
 515                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 516                                 return r;
 517                 }
 518
 519                 mount_set_state(m, new_state);
 520         }
 521
 522         return 0;
 523 }
 524
 525 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 526         Mount *m = MOUNT(u);
 527         MountParameters *p;
 528
 529         assert(m);
 530         assert(f);
 531
 532         if (m->from_proc_self_mountinfo)
 533                 p = &m->parameters_proc_self_mountinfo;
 534         else if (m->from_fragment)
 535                 p = &m->parameters_fragment;
 536         else
 537                 p = &m->parameters_etc_fstab;
 538
 539         fprintf(f,
 540                 "%sMount State: %s\n"
 541                 "%sWhere: %s\n"
 542                 "%sWhat: %s\n"
 543                 "%sFile System Type: %s\n"
 544                 "%sOptions: %s\n"
 545                 "%sFrom /etc/fstab: %s\n"
 546                 "%sFrom /proc/self/mountinfo: %s\n"
 547                 "%sFrom fragment: %s\n"
 548                 "%sDirectoryMode: %04o\n",
 549                 prefix, mount_state_to_string(m->state),
 550                 prefix, m->where,
 551                 prefix, strna(p->what),
 552                 prefix, strna(p->fstype),
 553                 prefix, strna(p->options),
 554                 prefix, yes_no(m->from_etc_fstab),
 555                 prefix, yes_no(m->from_proc_self_mountinfo),
 556                 prefix, yes_no(m->from_fragment),
 557                 prefix, m->directory_mode);
 558
 559         if (m->control_pid > 0)
 560                 fprintf(f,
 561                         "%sControl PID: %lu\n",
 562                         prefix, (unsigned long) m->control_pid);
 563
 564         exec_context_dump(&m->exec_context, f, prefix);
 565 }
 566
 567 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 568         pid_t pid;
 569         int r;
 570
 571         assert(m);
 572         assert(c);
 573         assert(_pid);
 574
 575         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 576                 goto fail;
 577
 578         if ((r = exec_spawn(c,
 579                             NULL,
 580                             &m->exec_context,
 581                             NULL, 0,
 582                             m->meta.manager->environment,
 583                             true,
 584                             true,
 585                             true,
 586                             m->meta.manager->confirm_spawn,
 587                             m->meta.cgroup_bondings,
 588                             &pid)) < 0)
 589                 goto fail;
 590
 591         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 592                 /* FIXME: we need to do something here */
 593                 goto fail;
 594
 595         *_pid = pid;
 596
 597         return 0;
 598
 599 fail:
 600         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 601
 602         return r;
 603 }
 604
 605 static void mount_enter_dead(Mount *m, bool success) {
 606         assert(m);
 607
 608         if (!success)
 609                 m->failure = true;
 610
 611         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 612 }
 613
 614 static void mount_enter_mounted(Mount *m, bool success) {
 615         assert(m);
 616
 617         if (!success)
 618                 m->failure = true;
 619
 620         mount_set_state(m, MOUNT_MOUNTED);
 621 }
 622
 623 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 624         int r;
 625         Set *pid_set = NULL;
 626         bool wait_for_exit = false;
 627
 628         assert(m);
 629
 630         if (!success)
 631                 m->failure = true;
 632
 633         if (m->exec_context.kill_mode != KILL_NONE) {
 634                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 635                            state == MOUNT_UNMOUNTING_SIGTERM ||
 636                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 637
 638                 if (m->control_pid > 0) {
 639                         if (kill(m->exec_context.kill_mode == KILL_PROCESS_GROUP ?
 640                                  -m->control_pid :
 641                                  m->control_pid, sig) < 0 && errno != ESRCH)
 642
 643                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 644                         else
 645                                 wait_for_exit = true;
 646                 }
 647
 648                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 649
 650                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 651                                 r = -ENOMEM;
 652                                 goto fail;
 653                         }
 654
 655                         /* Exclude the control pid from being killed via the cgroup */
 656                         if (m->control_pid > 0)
 657                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 658                                         goto fail;
 659
 660                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, pid_set)) < 0) {
 661                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 662                                         log_warning("Failed to kill control group: %s", strerror(-r));
 663                         } else if (r > 0)
 664                                 wait_for_exit = true;
 665
 666                         set_free(pid_set);
 667                 }
 668         }
 669
 670         if (wait_for_exit) {
 671                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 672                         goto fail;
 673
 674                 mount_set_state(m, state);
 675         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 676                 mount_enter_mounted(m, true);
 677         else
 678                 mount_enter_dead(m, true);
 679
 680         return;
 681
 682 fail:
 683         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 684
 685         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 686                 mount_enter_mounted(m, false);
 687         else
 688                 mount_enter_dead(m, false);
 689
 690         if (pid_set)
 691                 set_free(pid_set);
 692 }
 693
 694 static void mount_enter_unmounting(Mount *m, bool success) {
 695         int r;
 696
 697         assert(m);
 698
 699         if (!success)
 700                 m->failure = true;
 701
 702         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 703         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 704
 705         if ((r = exec_command_set(
 706                              m->control_command,
 707                              "/bin/umount",
 708                              m->where,
 709                              NULL)) < 0)
 710                 goto fail;
 711
 712         mount_unwatch_control_pid(m);
 713
 714         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 715                 goto fail;
 716
 717         mount_set_state(m, MOUNT_UNMOUNTING);
 718
 719         return;
 720
 721 fail:
 722         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 723         mount_enter_mounted(m, false);
 724 }
 725
 726 static void mount_enter_mounting(Mount *m) {
 727         int r;
 728
 729         assert(m);
 730
 731         m->control_command_id = MOUNT_EXEC_MOUNT;
 732         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 733
 734         mkdir_p(m->where, m->directory_mode);
 735
 736         if (m->from_fragment)
 737                 r = exec_command_set(
 738                                 m->control_command,
 739                                 "/bin/mount",
 740                                 m->parameters_fragment.what,
 741                                 m->where,
 742                                 "-t", m->parameters_fragment.fstype,
 743                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 744                                 NULL);
 745         else if (m->from_etc_fstab)
 746                 r = exec_command_set(
 747                                 m->control_command,
 748                                 "/bin/mount",
 749                                 m->where,
 750                                 NULL);
 751         else
 752                 r = -ENOENT;
 753
 754         if (r < 0)
 755                 goto fail;
 756
 757         mount_unwatch_control_pid(m);
 758
 759         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 760                 goto fail;
 761
 762         mount_set_state(m, MOUNT_MOUNTING);
 763
 764         return;
 765
 766 fail:
 767         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 768         mount_enter_dead(m, false);
 769 }
 770
 771 static void mount_enter_mounting_done(Mount *m) {
 772         assert(m);
 773
 774         mount_set_state(m, MOUNT_MOUNTING_DONE);
 775 }
 776
 777 static void mount_enter_remounting(Mount *m, bool success) {
 778         int r;
 779
 780         assert(m);
 781
 782         if (!success)
 783                 m->failure = true;
 784
 785         m->control_command_id = MOUNT_EXEC_REMOUNT;
 786         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 787
 788         if (m->from_fragment) {
 789                 char *buf = NULL;
 790                 const char *o;
 791
 792                 if (m->parameters_fragment.options) {
 793                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 794                                 r = -ENOMEM;
 795                                 goto fail;
 796                         }
 797
 798                         o = buf;
 799                 } else
 800                         o = "remount";
 801
 802                 r = exec_command_set(
 803                                 m->control_command,
 804                                 "/bin/mount",
 805                                 m->parameters_fragment.what,
 806                                 m->where,
 807                                 "-t", m->parameters_fragment.fstype,
 808                                 "-o", o,
 809                                 NULL);
 810
 811                 free(buf);
 812         } else if (m->from_etc_fstab)
 813                 r = exec_command_set(
 814                                 m->control_command,
 815                                 "/bin/mount",
 816                                 m->where,
 817                                 "-o", "remount",
 818                                 NULL);
 819         else
 820                 r = -ENOENT;
 821
 822         if (r < 0) {
 823                 r = -ENOMEM;
 824                 goto fail;
 825         }
 826
 827         mount_unwatch_control_pid(m);
 828
 829         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 830                 goto fail;
 831
 832         mount_set_state(m, MOUNT_REMOUNTING);
 833
 834         return;
 835
 836 fail:
 837         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 838         mount_enter_mounted(m, false);
 839 }
 840
 841 static int mount_start(Unit *u) {
 842         Mount *m = MOUNT(u);
 843
 844         assert(m);
 845
 846         /* We cannot fulfill this request right now, try again later
 847          * please! */
 848         if (m->state == MOUNT_UNMOUNTING ||
 849             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 850             m->state == MOUNT_UNMOUNTING_SIGKILL)
 851                 return -EAGAIN;
 852
 853         /* Already on it! */
 854         if (m->state == MOUNT_MOUNTING ||
 855             m->state == MOUNT_MOUNTING_SIGTERM ||
 856             m->state == MOUNT_MOUNTING_SIGKILL)
 857                 return 0;
 858
 859         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
 860
 861         m->failure = false;
 862         mount_enter_mounting(m);
 863         return 0;
 864 }
 865
 866 static int mount_stop(Unit *u) {
 867         Mount *m = MOUNT(u);
 868
 869         assert(m);
 870
 871         /* Already on it */
 872         if (m->state == MOUNT_UNMOUNTING ||
 873             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 874             m->state == MOUNT_UNMOUNTING_SIGTERM)
 875                 return 0;
 876
 877         assert(m->state == MOUNT_MOUNTING ||
 878                m->state == MOUNT_MOUNTING_DONE ||
 879                m->state == MOUNT_MOUNTED ||
 880                m->state == MOUNT_MOUNTING_SIGTERM ||
 881                m->state == MOUNT_MOUNTING_SIGKILL ||
 882                m->state == MOUNT_REMOUNTING ||
 883                m->state == MOUNT_REMOUNTING_SIGTERM ||
 884                m->state == MOUNT_REMOUNTING_SIGKILL);
 885
 886         mount_enter_unmounting(m, true);
 887         return 0;
 888 }
 889
 890 static int mount_reload(Unit *u) {
 891         Mount *m = MOUNT(u);
 892
 893         assert(m);
 894
 895         if (m->state == MOUNT_MOUNTING_DONE)
 896                 return -EAGAIN;
 897
 898         assert(m->state == MOUNT_MOUNTED);
 899
 900         mount_enter_remounting(m, true);
 901         return 0;
 902 }
 903
 904 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
 905         Mount *m = MOUNT(u);
 906
 907         assert(m);
 908         assert(f);
 909         assert(fds);
 910
 911         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
 912         unit_serialize_item(u, f, "failure", yes_no(m->failure));
 913
 914         if (m->control_pid > 0)
 915                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
 916
 917         if (m->control_command_id >= 0)
 918                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
 919
 920         return 0;
 921 }
 922
 923 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 924         Mount *m = MOUNT(u);
 925
 926         assert(u);
 927         assert(key);
 928         assert(value);
 929         assert(fds);
 930
 931         if (streq(key, "state")) {
 932                 MountState state;
 933
 934                 if ((state = mount_state_from_string(value)) < 0)
 935                         log_debug("Failed to parse state value %s", value);
 936                 else
 937                         m->deserialized_state = state;
 938         } else if (streq(key, "failure")) {
 939                 int b;
 940
 941                 if ((b = parse_boolean(value)) < 0)
 942                         log_debug("Failed to parse failure value %s", value);
 943                 else
 944                         m->failure = b || m->failure;
 945
 946         } else if (streq(key, "control-pid")) {
 947                 pid_t pid;
 948
 949                 if (parse_pid(value, &pid) < 0)
 950                         log_debug("Failed to parse control-pid value %s", value);
 951                 else
 952                         m->control_pid = pid;
 953         } else if (streq(key, "control-command")) {
 954                 MountExecCommand id;
 955
 956                 if ((id = mount_exec_command_from_string(value)) < 0)
 957                         log_debug("Failed to parse exec-command value %s", value);
 958                 else {
 959                         m->control_command_id = id;
 960                         m->control_command = m->exec_command + id;
 961                 }
 962
 963         } else
 964                 log_debug("Unknown serialization key '%s'", key);
 965
 966         return 0;
 967 }
 968
 969 static UnitActiveState mount_active_state(Unit *u) {
 970         assert(u);
 971
 972         return state_translation_table[MOUNT(u)->state];
 973 }
 974
 975 static const char *mount_sub_state_to_string(Unit *u) {
 976         assert(u);
 977
 978         return mount_state_to_string(MOUNT(u)->state);
 979 }
 980
 981 static bool mount_check_gc(Unit *u) {
 982         Mount *m = MOUNT(u);
 983
 984         assert(m);
 985
 986         return m->from_etc_fstab || m->from_proc_self_mountinfo;
 987 }
 988
 989 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 990         Mount *m = MOUNT(u);
 991         bool success;
 992
 993         assert(m);
 994         assert(pid >= 0);
 995
 996         if (pid != m->control_pid)
 997                 return;
 998
 999         m->control_pid = 0;
1000
1001         success = is_clean_exit(code, status);
1002         m->failure = m->failure || !success;
1003
1004         if (m->control_command) {
1005                 exec_status_exit(&m->control_command->exec_status, pid, code, status);
1006                 m->control_command = NULL;
1007                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1008         }
1009
1010         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1011                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1012
1013         /* Note that mount(8) returning and the kernel sending us a
1014          * mount table change event might happen out-of-order. If an
1015          * operation succeed we assume the kernel will follow soon too
1016          * and already change into the resulting state.  If it fails
1017          * we check if the kernel still knows about the mount. and
1018          * change state accordingly. */
1019
1020         switch (m->state) {
1021
1022         case MOUNT_MOUNTING:
1023         case MOUNT_MOUNTING_DONE:
1024         case MOUNT_MOUNTING_SIGKILL:
1025         case MOUNT_MOUNTING_SIGTERM:
1026         case MOUNT_REMOUNTING:
1027         case MOUNT_REMOUNTING_SIGKILL:
1028         case MOUNT_REMOUNTING_SIGTERM:
1029
1030                 if (success)
1031                         mount_enter_mounted(m, true);
1032                 else if (m->from_proc_self_mountinfo)
1033                         mount_enter_mounted(m, false);
1034                 else
1035                         mount_enter_dead(m, false);
1036                 break;
1037
1038         case MOUNT_UNMOUNTING:
1039         case MOUNT_UNMOUNTING_SIGKILL:
1040         case MOUNT_UNMOUNTING_SIGTERM:
1041
1042                 if (success)
1043                         mount_enter_dead(m, true);
1044                 else if (m->from_proc_self_mountinfo)
1045                         mount_enter_mounted(m, false);
1046                 else
1047                         mount_enter_dead(m, false);
1048                 break;
1049
1050         default:
1051                 assert_not_reached("Uh, control process died at wrong time.");
1052         }
1053
1054         /* Notify clients about changed exit status */
1055         unit_add_to_dbus_queue(u);
1056 }
1057
1058 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1059         Mount *m = MOUNT(u);
1060
1061         assert(m);
1062         assert(elapsed == 1);
1063         assert(w == &m->timer_watch);
1064
1065         switch (m->state) {
1066
1067         case MOUNT_MOUNTING:
1068         case MOUNT_MOUNTING_DONE:
1069                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1070                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1071                 break;
1072
1073         case MOUNT_REMOUNTING:
1074                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1075                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
1076                 break;
1077
1078         case MOUNT_UNMOUNTING:
1079                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1080                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1081                 break;
1082
1083         case MOUNT_MOUNTING_SIGTERM:
1084                 log_warning("%s mounting timed out. Killing.", u->meta.id);
1085                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1086                 break;
1087
1088         case MOUNT_REMOUNTING_SIGTERM:
1089                 log_warning("%s remounting timed out. Killing.", u->meta.id);
1090                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1091                 break;
1092
1093         case MOUNT_UNMOUNTING_SIGTERM:
1094                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
1095                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1096                 break;
1097
1098         case MOUNT_MOUNTING_SIGKILL:
1099         case MOUNT_REMOUNTING_SIGKILL:
1100         case MOUNT_UNMOUNTING_SIGKILL:
1101                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1102
1103                 if (m->from_proc_self_mountinfo)
1104                         mount_enter_mounted(m, false);
1105                 else
1106                         mount_enter_dead(m, false);
1107                 break;
1108
1109         default:
1110                 assert_not_reached("Timeout at wrong time.");
1111         }
1112 }
1113
1114 static int mount_add_one(
1115                 Manager *m,
1116                 const char *what,
1117                 const char *where,
1118                 const char *options,
1119                 const char *fstype,
1120                 bool from_proc_self_mountinfo,
1121                 bool set_flags) {
1122         int r;
1123         Unit *u;
1124         bool delete;
1125         char *e, *w = NULL, *o = NULL, *f = NULL;
1126         MountParameters *p;
1127
1128         assert(m);
1129         assert(what);
1130         assert(where);
1131         assert(options);
1132         assert(fstype);
1133
1134         assert(!set_flags || from_proc_self_mountinfo);
1135
1136         /* Ignore API mount points. They should never be referenced in
1137          * dependencies ever. */
1138         if (mount_point_is_api(where))
1139                 return 0;
1140
1141         if (streq(fstype, "autofs"))
1142                 return 0;
1143
1144         /* probably some kind of swap, ignore */
1145         if (!is_path(where))
1146                 return 0;
1147
1148         if (!(e = unit_name_from_path(where, ".mount")))
1149                 return -ENOMEM;
1150
1151         if (!(u = manager_get_unit(m, e))) {
1152                 delete = true;
1153
1154                 if (!(u = unit_new(m))) {
1155                         free(e);
1156                         return -ENOMEM;
1157                 }
1158
1159                 r = unit_add_name(u, e);
1160                 free(e);
1161
1162                 if (r < 0)
1163                         goto fail;
1164
1165                 if (!(MOUNT(u)->where = strdup(where))) {
1166                         r = -ENOMEM;
1167                         goto fail;
1168                 }
1169
1170                 unit_add_to_load_queue(u);
1171         } else {
1172                 delete = false;
1173                 free(e);
1174         }
1175
1176         if (!(w = strdup(what)) ||
1177             !(o = strdup(options)) ||
1178             !(f = strdup(fstype))) {
1179                 r = -ENOMEM;
1180                 goto fail;
1181         }
1182
1183         if (from_proc_self_mountinfo) {
1184                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1185
1186                 if (set_flags) {
1187                         MOUNT(u)->is_mounted = true;
1188                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1189                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1190                 }
1191
1192                 MOUNT(u)->from_proc_self_mountinfo = true;
1193         } else {
1194                 p = &MOUNT(u)->parameters_etc_fstab;
1195                 MOUNT(u)->from_etc_fstab = true;
1196         }
1197
1198         free(p->what);
1199         p->what = w;
1200
1201         free(p->options);
1202         p->options = o;
1203
1204         free(p->fstype);
1205         p->fstype = f;
1206
1207         unit_add_to_dbus_queue(u);
1208
1209         return 0;
1210
1211 fail:
1212         free(w);
1213         free(o);
1214         free(f);
1215
1216         if (delete && u)
1217                 unit_free(u);
1218
1219         return r;
1220 }
1221
1222 static char *fstab_node_to_udev_node(char *p) {
1223         char *dn, *t, *u;
1224         int r;
1225
1226         /* FIXME: to follow udev's logic 100% we need to leave valid
1227          * UTF8 chars unescaped */
1228
1229         if (startswith(p, "LABEL=")) {
1230
1231                 if (!(u = unquote(p+6, "\"\'")))
1232                         return NULL;
1233
1234                 t = xescape(u, "/ ");
1235                 free(u);
1236
1237                 if (!t)
1238                         return NULL;
1239
1240                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
1241                 free(t);
1242
1243                 if (r < 0)
1244                         return NULL;
1245
1246                 return dn;
1247         }
1248
1249         if (startswith(p, "UUID=")) {
1250
1251                 if (!(u = unquote(p+5, "\"\'")))
1252                         return NULL;
1253
1254                 t = xescape(u, "/ ");
1255                 free(u);
1256
1257                 if (!t)
1258                         return NULL;
1259
1260                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
1261                 free(t);
1262
1263                 if (r < 0)
1264                         return NULL;
1265
1266                 return dn;
1267         }
1268
1269         return strdup(p);
1270 }
1271
1272 static int mount_find_pri(char *options) {
1273         char *end, *pri;
1274         unsigned long r;
1275
1276         if (!(pri = mount_test_option(options, "pri=")))
1277                 return 0;
1278
1279         pri += 4;
1280
1281         errno = 0;
1282         r = strtoul(pri, &end, 10);
1283
1284         if (errno != 0)
1285                 return -errno;
1286
1287         if (end == pri || (*end != ',' && *end != 0))
1288                 return -EINVAL;
1289
1290         return (int) r;
1291 }
1292
1293 static int mount_load_etc_fstab(Manager *m) {
1294         FILE *f;
1295         int r;
1296         struct mntent* me;
1297
1298         assert(m);
1299
1300         errno = 0;
1301         if (!(f = setmntent("/etc/fstab", "r")))
1302                 return -errno;
1303
1304         while ((me = getmntent(f))) {
1305                 char *where, *what;
1306
1307                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1308                         r = -ENOMEM;
1309                         goto finish;
1310                 }
1311
1312                 if (!(where = strdup(me->mnt_dir))) {
1313                         free(what);
1314                         r = -ENOMEM;
1315                         goto finish;
1316                 }
1317
1318                 if (what[0] == '/')
1319                         path_kill_slashes(what);
1320
1321                 if (where[0] == '/')
1322                         path_kill_slashes(where);
1323
1324                 if (streq(me->mnt_type, "swap")) {
1325                         int pri;
1326
1327                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1328                                 r = pri;
1329                         else
1330                                 r = swap_add_one(m,
1331                                                  what,
1332                                                  pri,
1333                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1334                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1335                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1336                                                  false);
1337                 } else
1338                         r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1339
1340                 free(what);
1341                 free(where);
1342
1343                 if (r < 0)
1344                         goto finish;
1345         }
1346
1347         r = 0;
1348 finish:
1349
1350         endmntent(f);
1351         return r;
1352 }
1353
1354 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1355         int r;
1356         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1357
1358         assert(m);
1359
1360         rewind(m->proc_self_mountinfo);
1361
1362         for (;;) {
1363                 int k;
1364
1365                 device = path = options = options2 = fstype = d = p = o = NULL;
1366
1367                 if ((k = fscanf(m->proc_self_mountinfo,
1368                                 "%*s "       /* (1) mount id */
1369                                 "%*s "       /* (2) parent id */
1370                                 "%*s "       /* (3) major:minor */
1371                                 "%*s "       /* (4) root */
1372                                 "%ms "       /* (5) mount point */
1373                                 "%ms"        /* (6) mount options */
1374                                 "%*[^-]"     /* (7) optional fields */
1375                                 "- "         /* (8) seperator */
1376                                 "%ms "       /* (9) file system type */
1377                                 "%ms"        /* (10) mount source */
1378                                 "%ms"        /* (11) mount options 2 */
1379                                 "%*[^\n]",   /* some rubbish at the end */
1380                                 &path,
1381                                 &options,
1382                                 &fstype,
1383                                 &device,
1384                                 &options2)) != 5) {
1385
1386                         if (k == EOF)
1387                                 break;
1388
1389                         r = -EBADMSG;
1390                         goto finish;
1391                 }
1392
1393                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1394                         r = -ENOMEM;
1395                         goto finish;
1396                 }
1397
1398                 if (!(d = cunescape(device)) ||
1399                     !(p = cunescape(path))) {
1400                         r = -ENOMEM;
1401                         goto finish;
1402                 }
1403
1404                 if ((r = mount_add_one(m, d, p, o, fstype, true, set_flags)) < 0)
1405                         goto finish;
1406
1407                 free(device);
1408                 free(path);
1409                 free(options);
1410                 free(options2);
1411                 free(fstype);
1412                 free(d);
1413                 free(p);
1414                 free(o);
1415         }
1416
1417         r = 0;
1418
1419 finish:
1420         free(device);
1421         free(path);
1422         free(options);
1423         free(options2);
1424         free(fstype);
1425         free(d);
1426         free(p);
1427         free(o);
1428
1429         return r;
1430 }
1431
1432 static void mount_shutdown(Manager *m) {
1433         assert(m);
1434
1435         if (m->proc_self_mountinfo) {
1436                 fclose(m->proc_self_mountinfo);
1437                 m->proc_self_mountinfo = NULL;
1438         }
1439 }
1440
1441 static int mount_enumerate(Manager *m) {
1442         int r;
1443         struct epoll_event ev;
1444         assert(m);
1445
1446         if (!m->proc_self_mountinfo) {
1447                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1448                         return -errno;
1449
1450                 m->mount_watch.type = WATCH_MOUNT;
1451                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1452
1453                 zero(ev);
1454                 ev.events = EPOLLERR;
1455                 ev.data.ptr = &m->mount_watch;
1456
1457                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1458                         return -errno;
1459         }
1460
1461         if ((r = mount_load_etc_fstab(m)) < 0)
1462                 goto fail;
1463
1464         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1465                 goto fail;
1466
1467         return 0;
1468
1469 fail:
1470         mount_shutdown(m);
1471         return r;
1472 }
1473
1474 void mount_fd_event(Manager *m, int events) {
1475         Meta *meta;
1476         int r;
1477
1478         assert(m);
1479         assert(events == EPOLLERR);
1480
1481         /* The manager calls this for every fd event happening on the
1482          * /proc/self/mountinfo file, which informs us about mounting
1483          * table changes */
1484
1485         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1486                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1487
1488                 /* Reset flags, just in case, for later calls */
1489                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1490                         Mount *mount = (Mount*) meta;
1491
1492                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1493                 }
1494
1495                 return;
1496         }
1497
1498         manager_dispatch_load_queue(m);
1499
1500         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1501                 Mount *mount = (Mount*) meta;
1502
1503                 if (!mount->is_mounted) {
1504                         /* This has just been unmounted. */
1505
1506                         mount->from_proc_self_mountinfo = false;
1507
1508                         switch (mount->state) {
1509
1510                         case MOUNT_MOUNTED:
1511                                 mount_enter_dead(mount, true);
1512                                 break;
1513
1514                         default:
1515                                 mount_set_state(mount, mount->state);
1516                                 break;
1517
1518                         }
1519
1520                 } else if (mount->just_mounted || mount->just_changed) {
1521
1522                         /* New or changed entrymount */
1523
1524                         switch (mount->state) {
1525
1526                         case MOUNT_DEAD:
1527                         case MOUNT_FAILED:
1528                                 mount_enter_mounted(mount, true);
1529                                 break;
1530
1531                         case MOUNT_MOUNTING:
1532                                 mount_enter_mounting_done(mount);
1533                                 break;
1534
1535                         default:
1536                                 /* Nothing really changed, but let's
1537                                  * issue an notification call
1538                                  * nonetheless, in case somebody is
1539                                  * waiting for this. (e.g. file system
1540                                  * ro/rw remounts.) */
1541                                 mount_set_state(mount, mount->state);
1542                                 break;
1543                         }
1544                 }
1545
1546                 /* Reset the flags for later calls */
1547                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1548         }
1549 }
1550
1551 static void mount_reset_failed(Unit *u) {
1552         Mount *m = MOUNT(u);
1553
1554         assert(m);
1555
1556         if (m->state == MOUNT_FAILED)
1557                 mount_set_state(m, MOUNT_DEAD);
1558
1559         m->failure = false;
1560 }
1561
1562 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1563         [MOUNT_DEAD] = "dead",
1564         [MOUNT_MOUNTING] = "mounting",
1565         [MOUNT_MOUNTING_DONE] = "mounting-done",
1566         [MOUNT_MOUNTED] = "mounted",
1567         [MOUNT_REMOUNTING] = "remounting",
1568         [MOUNT_UNMOUNTING] = "unmounting",
1569         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1570         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1571         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1572         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1573         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1574         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1575         [MOUNT_FAILED] = "failed"
1576 };
1577
1578 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1579
1580 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1581         [MOUNT_EXEC_MOUNT] = "ExecMount",
1582         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1583         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1584 };
1585
1586 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1587
1588 const UnitVTable mount_vtable = {
1589         .suffix = ".mount",
1590
1591         .no_alias = true,
1592         .no_instances = true,
1593         .no_isolate = true,
1594         .show_status = true,
1595
1596         .init = mount_init,
1597         .load = mount_load,
1598         .done = mount_done,
1599
1600         .coldplug = mount_coldplug,
1601
1602         .dump = mount_dump,
1603
1604         .start = mount_start,
1605         .stop = mount_stop,
1606         .reload = mount_reload,
1607
1608         .serialize = mount_serialize,
1609         .deserialize_item = mount_deserialize_item,
1610
1611         .active_state = mount_active_state,
1612         .sub_state_to_string = mount_sub_state_to_string,
1613
1614         .check_gc = mount_check_gc,
1615
1616         .sigchld_event = mount_sigchld_event,
1617         .timer_event = mount_timer_event,
1618
1619         .reset_failed = mount_reset_failed,
1620
1621         .bus_interface = "org.freedesktop.systemd1.Mount",
1622         .bus_message_handler = bus_mount_message_handler,
1623         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1624
1625         .enumerate = mount_enumerate,
1626         .shutdown = mount_shutdown
1627 };