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