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                 /* 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_MAINTENANCE)
 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_MAINTENANCE : 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         bool sent = false;
 626
 627         assert(m);
 628
 629         if (!success)
 630                 m->failure = true;
 631
 632         if (m->exec_context.kill_mode != KILL_NONE) {
 633                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 634                            state == MOUNT_UNMOUNTING_SIGTERM ||
 635                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 636
 637                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 638
 639                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig)) < 0) {
 640                                 if (r != -EAGAIN && r != -ESRCH)
 641                                         goto fail;
 642                         } else
 643                                 sent = true;
 644                 }
 645
 646                 if (!sent && m->control_pid > 0)
 647                         if (kill(m->exec_context.kill_mode == KILL_PROCESS ?
 648                                  m->control_pid :
 649                                  -m->control_pid, sig) < 0 && errno != ESRCH) {
 650
 651                                 r = -errno;
 652                                 goto fail;
 653                         }
 654         }
 655
 656         if (sent) {
 657                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 658                         goto fail;
 659
 660                 mount_set_state(m, state);
 661         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 662                 mount_enter_mounted(m, true);
 663         else
 664                 mount_enter_dead(m, true);
 665
 666         return;
 667
 668 fail:
 669         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 670
 671         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 672                 mount_enter_mounted(m, false);
 673         else
 674                 mount_enter_dead(m, false);
 675 }
 676
 677 static void mount_enter_unmounting(Mount *m, bool success) {
 678         int r;
 679
 680         assert(m);
 681
 682         if (!success)
 683                 m->failure = true;
 684
 685         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 686         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 687
 688         if ((r = exec_command_set(
 689                              m->control_command,
 690                              "/bin/umount",
 691                              m->where,
 692                              NULL)) < 0)
 693                 goto fail;
 694
 695         mount_unwatch_control_pid(m);
 696
 697         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 698                 goto fail;
 699
 700         mount_set_state(m, MOUNT_UNMOUNTING);
 701
 702         return;
 703
 704 fail:
 705         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 706         mount_enter_mounted(m, false);
 707 }
 708
 709 static void mount_enter_mounting(Mount *m) {
 710         int r;
 711
 712         assert(m);
 713
 714         m->control_command_id = MOUNT_EXEC_MOUNT;
 715         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 716
 717         mkdir_p(m->where, m->directory_mode);
 718
 719         if (m->from_fragment)
 720                 r = exec_command_set(
 721                                 m->control_command,
 722                                 "/bin/mount",
 723                                 m->parameters_fragment.what,
 724                                 m->where,
 725                                 "-t", m->parameters_fragment.fstype,
 726                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 727                                 NULL);
 728         else if (m->from_etc_fstab)
 729                 r = exec_command_set(
 730                                 m->control_command,
 731                                 "/bin/mount",
 732                                 m->where,
 733                                 NULL);
 734         else
 735                 r = -ENOENT;
 736
 737         if (r < 0)
 738                 goto fail;
 739
 740         mount_unwatch_control_pid(m);
 741
 742         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 743                 goto fail;
 744
 745         mount_set_state(m, MOUNT_MOUNTING);
 746
 747         return;
 748
 749 fail:
 750         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 751         mount_enter_dead(m, false);
 752 }
 753
 754 static void mount_enter_mounting_done(Mount *m) {
 755         assert(m);
 756
 757         mount_set_state(m, MOUNT_MOUNTING_DONE);
 758 }
 759
 760 static void mount_enter_remounting(Mount *m, bool success) {
 761         int r;
 762
 763         assert(m);
 764
 765         if (!success)
 766                 m->failure = true;
 767
 768         m->control_command_id = MOUNT_EXEC_REMOUNT;
 769         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 770
 771         if (m->from_fragment) {
 772                 char *buf = NULL;
 773                 const char *o;
 774
 775                 if (m->parameters_fragment.options) {
 776                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 777                                 r = -ENOMEM;
 778                                 goto fail;
 779                         }
 780
 781                         o = buf;
 782                 } else
 783                         o = "remount";
 784
 785                 r = exec_command_set(
 786                                 m->control_command,
 787                                 "/bin/mount",
 788                                 m->parameters_fragment.what,
 789                                 m->where,
 790                                 "-t", m->parameters_fragment.fstype,
 791                                 "-o", o,
 792                                 NULL);
 793
 794                 free(buf);
 795         } else if (m->from_etc_fstab)
 796                 r = exec_command_set(
 797                                 m->control_command,
 798                                 "/bin/mount",
 799                                 m->where,
 800                                 "-o", "remount",
 801                                 NULL);
 802         else
 803                 r = -ENOENT;
 804
 805         if (r < 0) {
 806                 r = -ENOMEM;
 807                 goto fail;
 808         }
 809
 810         mount_unwatch_control_pid(m);
 811
 812         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 813                 goto fail;
 814
 815         mount_set_state(m, MOUNT_REMOUNTING);
 816
 817         return;
 818
 819 fail:
 820         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 821         mount_enter_mounted(m, false);
 822 }
 823
 824 static int mount_start(Unit *u) {
 825         Mount *m = MOUNT(u);
 826
 827         assert(m);
 828
 829         /* We cannot fulfill this request right now, try again later
 830          * please! */
 831         if (m->state == MOUNT_UNMOUNTING ||
 832             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 833             m->state == MOUNT_UNMOUNTING_SIGKILL)
 834                 return -EAGAIN;
 835
 836         /* Already on it! */
 837         if (m->state == MOUNT_MOUNTING ||
 838             m->state == MOUNT_MOUNTING_SIGTERM ||
 839             m->state == MOUNT_MOUNTING_SIGKILL)
 840                 return 0;
 841
 842         assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTENANCE);
 843
 844         m->failure = false;
 845         mount_enter_mounting(m);
 846         return 0;
 847 }
 848
 849 static int mount_stop(Unit *u) {
 850         Mount *m = MOUNT(u);
 851
 852         assert(m);
 853
 854         /* Already on it */
 855         if (m->state == MOUNT_UNMOUNTING ||
 856             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 857             m->state == MOUNT_UNMOUNTING_SIGTERM)
 858                 return 0;
 859
 860         assert(m->state == MOUNT_MOUNTING ||
 861                m->state == MOUNT_MOUNTING_DONE ||
 862                m->state == MOUNT_MOUNTED ||
 863                m->state == MOUNT_MOUNTING_SIGTERM ||
 864                m->state == MOUNT_MOUNTING_SIGKILL ||
 865                m->state == MOUNT_REMOUNTING ||
 866                m->state == MOUNT_REMOUNTING_SIGTERM ||
 867                m->state == MOUNT_REMOUNTING_SIGKILL);
 868
 869         mount_enter_unmounting(m, true);
 870         return 0;
 871 }
 872
 873 static int mount_reload(Unit *u) {
 874         Mount *m = MOUNT(u);
 875
 876         assert(m);
 877
 878         if (m->state == MOUNT_MOUNTING_DONE)
 879                 return -EAGAIN;
 880
 881         assert(m->state == MOUNT_MOUNTED);
 882
 883         mount_enter_remounting(m, true);
 884         return 0;
 885 }
 886
 887 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
 888         Mount *m = MOUNT(u);
 889
 890         assert(m);
 891         assert(f);
 892         assert(fds);
 893
 894         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
 895         unit_serialize_item(u, f, "failure", yes_no(m->failure));
 896
 897         if (m->control_pid > 0)
 898                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
 899
 900         if (m->control_command_id >= 0)
 901                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
 902
 903         return 0;
 904 }
 905
 906 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 907         Mount *m = MOUNT(u);
 908
 909         assert(u);
 910         assert(key);
 911         assert(value);
 912         assert(fds);
 913
 914         if (streq(key, "state")) {
 915                 MountState state;
 916
 917                 if ((state = mount_state_from_string(value)) < 0)
 918                         log_debug("Failed to parse state value %s", value);
 919                 else
 920                         m->deserialized_state = state;
 921         } else if (streq(key, "failure")) {
 922                 int b;
 923
 924                 if ((b = parse_boolean(value)) < 0)
 925                         log_debug("Failed to parse failure value %s", value);
 926                 else
 927                         m->failure = b || m->failure;
 928
 929         } else if (streq(key, "control-pid")) {
 930                 pid_t pid;
 931
 932                 if (parse_pid(value, &pid) < 0)
 933                         log_debug("Failed to parse control-pid value %s", value);
 934                 else
 935                         m->control_pid = pid;
 936         } else if (streq(key, "control-command")) {
 937                 MountExecCommand id;
 938
 939                 if ((id = mount_exec_command_from_string(value)) < 0)
 940                         log_debug("Failed to parse exec-command value %s", value);
 941                 else {
 942                         m->control_command_id = id;
 943                         m->control_command = m->exec_command + id;
 944                 }
 945
 946         } else
 947                 log_debug("Unknown serialization key '%s'", key);
 948
 949         return 0;
 950 }
 951
 952 static UnitActiveState mount_active_state(Unit *u) {
 953         assert(u);
 954
 955         return state_translation_table[MOUNT(u)->state];
 956 }
 957
 958 static const char *mount_sub_state_to_string(Unit *u) {
 959         assert(u);
 960
 961         return mount_state_to_string(MOUNT(u)->state);
 962 }
 963
 964 static bool mount_check_gc(Unit *u) {
 965         Mount *m = MOUNT(u);
 966
 967         assert(m);
 968
 969         return m->from_etc_fstab || m->from_proc_self_mountinfo;
 970 }
 971
 972 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 973         Mount *m = MOUNT(u);
 974         bool success;
 975
 976         assert(m);
 977         assert(pid >= 0);
 978
 979         if (pid != m->control_pid)
 980                 return;
 981
 982         m->control_pid = 0;
 983
 984         success = is_clean_exit(code, status);
 985         m->failure = m->failure || !success;
 986
 987         if (m->control_command) {
 988                 exec_status_exit(&m->control_command->exec_status, pid, code, status);
 989                 m->control_command = NULL;
 990                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 991         }
 992
 993         log_full(success ? LOG_DEBUG : LOG_NOTICE,
 994                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
 995
 996         /* Note that mount(8) returning and the kernel sending us a
 997          * mount table change event might happen out-of-order. If an
 998          * operation succeed we assume the kernel will follow soon too
 999          * and already change into the resulting state.  If it fails
1000          * we check if the kernel still knows about the mount. and
1001          * change state accordingly. */
1002
1003         switch (m->state) {
1004
1005         case MOUNT_MOUNTING:
1006         case MOUNT_MOUNTING_DONE:
1007         case MOUNT_MOUNTING_SIGKILL:
1008         case MOUNT_MOUNTING_SIGTERM:
1009         case MOUNT_REMOUNTING:
1010         case MOUNT_REMOUNTING_SIGKILL:
1011         case MOUNT_REMOUNTING_SIGTERM:
1012
1013                 if (success)
1014                         mount_enter_mounted(m, true);
1015                 else if (m->from_proc_self_mountinfo)
1016                         mount_enter_mounted(m, false);
1017                 else
1018                         mount_enter_dead(m, false);
1019                 break;
1020
1021         case MOUNT_UNMOUNTING:
1022         case MOUNT_UNMOUNTING_SIGKILL:
1023         case MOUNT_UNMOUNTING_SIGTERM:
1024
1025                 if (success)
1026                         mount_enter_dead(m, true);
1027                 else if (m->from_proc_self_mountinfo)
1028                         mount_enter_mounted(m, false);
1029                 else
1030                         mount_enter_dead(m, false);
1031                 break;
1032
1033         default:
1034                 assert_not_reached("Uh, control process died at wrong time.");
1035         }
1036
1037         /* Notify clients about changed exit status */
1038         unit_add_to_dbus_queue(u);
1039 }
1040
1041 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1042         Mount *m = MOUNT(u);
1043
1044         assert(m);
1045         assert(elapsed == 1);
1046         assert(w == &m->timer_watch);
1047
1048         switch (m->state) {
1049
1050         case MOUNT_MOUNTING:
1051         case MOUNT_MOUNTING_DONE:
1052                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1053                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1054                 break;
1055
1056         case MOUNT_REMOUNTING:
1057                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1058                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
1059                 break;
1060
1061         case MOUNT_UNMOUNTING:
1062                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1063                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1064                 break;
1065
1066         case MOUNT_MOUNTING_SIGTERM:
1067                 log_warning("%s mounting timed out. Killing.", u->meta.id);
1068                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1069                 break;
1070
1071         case MOUNT_REMOUNTING_SIGTERM:
1072                 log_warning("%s remounting timed out. Killing.", u->meta.id);
1073                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1074                 break;
1075
1076         case MOUNT_UNMOUNTING_SIGTERM:
1077                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
1078                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1079                 break;
1080
1081         case MOUNT_MOUNTING_SIGKILL:
1082         case MOUNT_REMOUNTING_SIGKILL:
1083         case MOUNT_UNMOUNTING_SIGKILL:
1084                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1085
1086                 if (m->from_proc_self_mountinfo)
1087                         mount_enter_mounted(m, false);
1088                 else
1089                         mount_enter_dead(m, false);
1090                 break;
1091
1092         default:
1093                 assert_not_reached("Timeout at wrong time.");
1094         }
1095 }
1096
1097 static int mount_add_one(
1098                 Manager *m,
1099                 const char *what,
1100                 const char *where,
1101                 const char *options,
1102                 const char *fstype,
1103                 bool from_proc_self_mountinfo,
1104                 bool set_flags) {
1105         int r;
1106         Unit *u;
1107         bool delete;
1108         char *e, *w = NULL, *o = NULL, *f = NULL;
1109         MountParameters *p;
1110
1111         assert(m);
1112         assert(what);
1113         assert(where);
1114         assert(options);
1115         assert(fstype);
1116
1117         assert(!set_flags || from_proc_self_mountinfo);
1118
1119         /* Ignore API mount points. They should never be referenced in
1120          * dependencies ever. */
1121         if (mount_point_is_api(where))
1122                 return 0;
1123
1124         if (streq(fstype, "autofs"))
1125                 return 0;
1126
1127         /* probably some kind of swap, ignore */
1128         if (!is_path(where))
1129                 return 0;
1130
1131         if (!(e = unit_name_from_path(where, ".mount")))
1132                 return -ENOMEM;
1133
1134         if (!(u = manager_get_unit(m, e))) {
1135                 delete = true;
1136
1137                 if (!(u = unit_new(m))) {
1138                         free(e);
1139                         return -ENOMEM;
1140                 }
1141
1142                 r = unit_add_name(u, e);
1143                 free(e);
1144
1145                 if (r < 0)
1146                         goto fail;
1147
1148                 if (!(MOUNT(u)->where = strdup(where))) {
1149                         r = -ENOMEM;
1150                         goto fail;
1151                 }
1152
1153                 unit_add_to_load_queue(u);
1154         } else {
1155                 delete = false;
1156                 free(e);
1157         }
1158
1159         if (!(w = strdup(what)) ||
1160             !(o = strdup(options)) ||
1161             !(f = strdup(fstype))) {
1162                 r = -ENOMEM;
1163                 goto fail;
1164         }
1165
1166         if (from_proc_self_mountinfo) {
1167                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1168
1169                 if (set_flags) {
1170                         MOUNT(u)->is_mounted = true;
1171                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1172                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1173                 }
1174
1175                 MOUNT(u)->from_proc_self_mountinfo = true;
1176         } else {
1177                 p = &MOUNT(u)->parameters_etc_fstab;
1178                 MOUNT(u)->from_etc_fstab = true;
1179         }
1180
1181         free(p->what);
1182         p->what = w;
1183
1184         free(p->options);
1185         p->options = o;
1186
1187         free(p->fstype);
1188         p->fstype = f;
1189
1190         unit_add_to_dbus_queue(u);
1191
1192         return 0;
1193
1194 fail:
1195         free(w);
1196         free(o);
1197         free(f);
1198
1199         if (delete && u)
1200                 unit_free(u);
1201
1202         return r;
1203 }
1204
1205 static char *fstab_node_to_udev_node(char *p) {
1206         char *dn, *t, *u;
1207         int r;
1208
1209         /* FIXME: to follow udev's logic 100% we need to leave valid
1210          * UTF8 chars unescaped */
1211
1212         if (startswith(p, "LABEL=")) {
1213
1214                 if (!(u = unquote(p+6, '"')))
1215                         return NULL;
1216
1217                 t = xescape(u, "/ ");
1218                 free(u);
1219
1220                 if (!t)
1221                         return NULL;
1222
1223                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
1224                 free(t);
1225
1226                 if (r < 0)
1227                         return NULL;
1228
1229                 return dn;
1230         }
1231
1232         if (startswith(p, "UUID=")) {
1233
1234                 if (!(u = unquote(p+5, '"')))
1235                         return NULL;
1236
1237                 t = xescape(u, "/ ");
1238                 free(u);
1239
1240                 if (!t)
1241                         return NULL;
1242
1243                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
1244                 free(t);
1245
1246                 if (r < 0)
1247                         return NULL;
1248
1249                 return dn;
1250         }
1251
1252         return strdup(p);
1253 }
1254
1255 static int mount_find_pri(char *options) {
1256         char *end, *pri;
1257         unsigned long r;
1258
1259         if (!(pri = mount_test_option(options, "pri=")))
1260                 return 0;
1261
1262         pri += 4;
1263
1264         errno = 0;
1265         r = strtoul(pri, &end, 10);
1266
1267         if (errno != 0)
1268                 return -errno;
1269
1270         if (end == pri || (*end != ',' && *end != 0))
1271                 return -EINVAL;
1272
1273         return (int) r;
1274 }
1275
1276 static int mount_load_etc_fstab(Manager *m) {
1277         FILE *f;
1278         int r;
1279         struct mntent* me;
1280
1281         assert(m);
1282
1283         errno = 0;
1284         if (!(f = setmntent("/etc/fstab", "r")))
1285                 return -errno;
1286
1287         while ((me = getmntent(f))) {
1288                 char *where, *what;
1289
1290                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1291                         r = -ENOMEM;
1292                         goto finish;
1293                 }
1294
1295                 if (!(where = strdup(me->mnt_dir))) {
1296                         free(what);
1297                         r = -ENOMEM;
1298                         goto finish;
1299                 }
1300
1301                 if (what[0] == '/')
1302                         path_kill_slashes(what);
1303
1304                 if (where[0] == '/')
1305                         path_kill_slashes(where);
1306
1307                 if (streq(me->mnt_type, "swap")) {
1308                         int pri;
1309
1310                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1311                                 r = pri;
1312                         else
1313                                 r = swap_add_one(m,
1314                                                  what,
1315                                                  pri,
1316                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1317                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1318                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1319                                                  false);
1320                 } else
1321                         r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1322
1323                 free(what);
1324                 free(where);
1325
1326                 if (r < 0)
1327                         goto finish;
1328         }
1329
1330         r = 0;
1331 finish:
1332
1333         endmntent(f);
1334         return r;
1335 }
1336
1337 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1338         int r;
1339         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1340
1341         assert(m);
1342
1343         rewind(m->proc_self_mountinfo);
1344
1345         for (;;) {
1346                 int k;
1347
1348                 device = path = options = options2 = fstype = d = p = o = NULL;
1349
1350                 if ((k = fscanf(m->proc_self_mountinfo,
1351                                 "%*s "       /* (1) mount id */
1352                                 "%*s "       /* (2) parent id */
1353                                 "%*s "       /* (3) major:minor */
1354                                 "%*s "       /* (4) root */
1355                                 "%ms "       /* (5) mount point */
1356                                 "%ms"        /* (6) mount options */
1357                                 "%*[^-]"     /* (7) optional fields */
1358                                 "- "         /* (8) seperator */
1359                                 "%ms "       /* (9) file system type */
1360                                 "%ms"        /* (10) mount source */
1361                                 "%ms"        /* (11) mount options 2 */
1362                                 "%*[^\n]",   /* some rubbish at the end */
1363                                 &path,
1364                                 &options,
1365                                 &fstype,
1366                                 &device,
1367                                 &options2)) != 5) {
1368
1369                         if (k == EOF)
1370                                 break;
1371
1372                         r = -EBADMSG;
1373                         goto finish;
1374                 }
1375
1376                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1377                         r = -ENOMEM;
1378                         goto finish;
1379                 }
1380
1381                 if (!(d = cunescape(device)) ||
1382                     !(p = cunescape(path))) {
1383                         r = -ENOMEM;
1384                         goto finish;
1385                 }
1386
1387                 if ((r = mount_add_one(m, d, p, o, fstype, true, set_flags)) < 0)
1388                         goto finish;
1389
1390                 free(device);
1391                 free(path);
1392                 free(options);
1393                 free(options2);
1394                 free(fstype);
1395                 free(d);
1396                 free(p);
1397                 free(o);
1398         }
1399
1400         r = 0;
1401
1402 finish:
1403         free(device);
1404         free(path);
1405         free(options);
1406         free(options2);
1407         free(fstype);
1408         free(d);
1409         free(p);
1410         free(o);
1411
1412         return r;
1413 }
1414
1415 static void mount_shutdown(Manager *m) {
1416         assert(m);
1417
1418         if (m->proc_self_mountinfo) {
1419                 fclose(m->proc_self_mountinfo);
1420                 m->proc_self_mountinfo = NULL;
1421         }
1422 }
1423
1424 static int mount_enumerate(Manager *m) {
1425         int r;
1426         struct epoll_event ev;
1427         assert(m);
1428
1429         if (!m->proc_self_mountinfo) {
1430                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1431                         return -errno;
1432
1433                 m->mount_watch.type = WATCH_MOUNT;
1434                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1435
1436                 zero(ev);
1437                 ev.events = EPOLLERR;
1438                 ev.data.ptr = &m->mount_watch;
1439
1440                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1441                         return -errno;
1442         }
1443
1444         if ((r = mount_load_etc_fstab(m)) < 0)
1445                 goto fail;
1446
1447         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1448                 goto fail;
1449
1450         return 0;
1451
1452 fail:
1453         mount_shutdown(m);
1454         return r;
1455 }
1456
1457 void mount_fd_event(Manager *m, int events) {
1458         Meta *meta;
1459         int r;
1460
1461         assert(m);
1462         assert(events == EPOLLERR);
1463
1464         /* The manager calls this for every fd event happening on the
1465          * /proc/self/mountinfo file, which informs us about mounting
1466          * table changes */
1467
1468         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1469                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1470
1471                 /* Reset flags, just in case, for later calls */
1472                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1473                         Mount *mount = (Mount*) meta;
1474
1475                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1476                 }
1477
1478                 return;
1479         }
1480
1481         manager_dispatch_load_queue(m);
1482
1483         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1484                 Mount *mount = (Mount*) meta;
1485
1486                 if (!mount->is_mounted) {
1487                         /* This has just been unmounted. */
1488
1489                         mount->from_proc_self_mountinfo = false;
1490
1491                         switch (mount->state) {
1492
1493                         case MOUNT_MOUNTED:
1494                                 mount_enter_dead(mount, true);
1495                                 break;
1496
1497                         default:
1498                                 mount_set_state(mount, mount->state);
1499                                 break;
1500
1501                         }
1502
1503                 } else if (mount->just_mounted || mount->just_changed) {
1504
1505                         /* New or changed entrymount */
1506
1507                         switch (mount->state) {
1508
1509                         case MOUNT_DEAD:
1510                         case MOUNT_MAINTENANCE:
1511                                 mount_enter_mounted(mount, true);
1512                                 break;
1513
1514                         case MOUNT_MOUNTING:
1515                                 mount_enter_mounting_done(mount);
1516                                 break;
1517
1518                         default:
1519                                 /* Nothing really changed, but let's
1520                                  * issue an notification call
1521                                  * nonetheless, in case somebody is
1522                                  * waiting for this. (e.g. file system
1523                                  * ro/rw remounts.) */
1524                                 mount_set_state(mount, mount->state);
1525                                 break;
1526                         }
1527                 }
1528
1529                 /* Reset the flags for later calls */
1530                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1531         }
1532 }
1533
1534 static void mount_reset_maintenance(Unit *u) {
1535         Mount *m = MOUNT(u);
1536
1537         assert(m);
1538
1539         if (m->state == MOUNT_MAINTENANCE)
1540                 mount_set_state(m, MOUNT_DEAD);
1541
1542         m->failure = false;
1543 }
1544
1545 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1546         [MOUNT_DEAD] = "dead",
1547         [MOUNT_MOUNTING] = "mounting",
1548         [MOUNT_MOUNTING_DONE] = "mounting-done",
1549         [MOUNT_MOUNTED] = "mounted",
1550         [MOUNT_REMOUNTING] = "remounting",
1551         [MOUNT_UNMOUNTING] = "unmounting",
1552         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1553         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1554         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1555         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1556         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1557         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1558         [MOUNT_MAINTENANCE] = "maintenance"
1559 };
1560
1561 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1562
1563 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1564         [MOUNT_EXEC_MOUNT] = "ExecMount",
1565         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1566         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1567 };
1568
1569 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1570
1571 const UnitVTable mount_vtable = {
1572         .suffix = ".mount",
1573
1574         .no_alias = true,
1575         .no_instances = true,
1576         .no_isolate = true,
1577         .show_status = true,
1578
1579         .init = mount_init,
1580         .load = mount_load,
1581         .done = mount_done,
1582
1583         .coldplug = mount_coldplug,
1584
1585         .dump = mount_dump,
1586
1587         .start = mount_start,
1588         .stop = mount_stop,
1589         .reload = mount_reload,
1590
1591         .serialize = mount_serialize,
1592         .deserialize_item = mount_deserialize_item,
1593
1594         .active_state = mount_active_state,
1595         .sub_state_to_string = mount_sub_state_to_string,
1596
1597         .check_gc = mount_check_gc,
1598
1599         .sigchld_event = mount_sigchld_event,
1600         .timer_event = mount_timer_event,
1601
1602         .reset_maintenance = mount_reset_maintenance,
1603
1604         .bus_interface = "org.freedesktop.systemd1.Mount",
1605         .bus_message_handler = bus_mount_message_handler,
1606         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1607
1608         .enumerate = mount_enumerate,
1609         .shutdown = mount_shutdown
1610 };