src/mount.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <mntent.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27
  28 #include "unit.h"
  29 #include "mount.h"
  30 #include "load-fragment.h"
  31 #include "load-dropin.h"
  32 #include "log.h"
  33 #include "strv.h"
  34 #include "mount-setup.h"
  35 #include "unit-name.h"
  36 #include "dbus-mount.h"
  37 #include "special.h"
  38
  39 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  40         [MOUNT_DEAD] = UNIT_INACTIVE,
  41         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  42         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  43         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  44         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  45         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  46         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  47         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  48         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  49         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  50         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  51         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  52         [MOUNT_FAILED] = UNIT_FAILED
  53 };
  54
  55 static void mount_init(Unit *u) {
  56         Mount *m = MOUNT(u);
  57
  58         assert(u);
  59         assert(u->meta.load_state == UNIT_STUB);
  60
  61         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  62         m->directory_mode = 0755;
  63
  64         exec_context_init(&m->exec_context);
  65
  66         /* We need to make sure that /bin/mount is always called in
  67          * the same process group as us, so that the autofs kernel
  68          * side doesn't send us another mount request while we are
  69          * already trying to comply its last one. */
  70         m->exec_context.same_pgrp = true;
  71
  72         m->timer_watch.type = WATCH_INVALID;
  73
  74         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  75 }
  76
  77 static void mount_unwatch_control_pid(Mount *m) {
  78         assert(m);
  79
  80         if (m->control_pid <= 0)
  81                 return;
  82
  83         unit_unwatch_pid(UNIT(m), m->control_pid);
  84         m->control_pid = 0;
  85 }
  86
  87 static void mount_parameters_done(MountParameters *p) {
  88         assert(p);
  89
  90         free(p->what);
  91         free(p->options);
  92         free(p->fstype);
  93
  94         p->what = p->options = p->fstype = NULL;
  95 }
  96
  97 static void mount_done(Unit *u) {
  98         Mount *m = MOUNT(u);
  99
 100         assert(m);
 101
 102         free(m->where);
 103         m->where = NULL;
 104
 105         mount_parameters_done(&m->parameters_etc_fstab);
 106         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 107         mount_parameters_done(&m->parameters_fragment);
 108
 109         exec_context_done(&m->exec_context);
 110         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 111         m->control_command = NULL;
 112
 113         mount_unwatch_control_pid(m);
 114
 115         unit_unwatch_timer(u, &m->timer_watch);
 116 }
 117
 118 static int mount_add_mount_links(Mount *m) {
 119         Meta *other;
 120         int r;
 121
 122         assert(m);
 123
 124         /* Adds in links to other mount points that might lie below or
 125          * above us in the hierarchy */
 126
 127         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) {
 128                 Mount *n = (Mount*) other;
 129
 130                 if (n == m)
 131                         continue;
 132
 133                 if (n->meta.load_state != UNIT_LOADED)
 134                         continue;
 135
 136                 if (path_startswith(m->where, n->where)) {
 137
 138                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 139                                 return r;
 140
 141                         if (n->from_etc_fstab || n->from_fragment)
 142                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 143                                         return r;
 144
 145                 } else if (path_startswith(n->where, m->where)) {
 146
 147                         if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(n), true)) < 0)
 148                                 return r;
 149
 150                         if (m->from_etc_fstab || m->from_fragment)
 151                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 152                                         return r;
 153                 }
 154         }
 155
 156         return 0;
 157 }
 158
 159 static int mount_add_swap_links(Mount *m) {
 160         Meta *other;
 161         int r;
 162
 163         assert(m);
 164
 165         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP])
 166                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 167                         return r;
 168
 169         return 0;
 170 }
 171
 172 static int mount_add_path_links(Mount *m) {
 173         Meta *other;
 174         int r;
 175
 176         assert(m);
 177
 178         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH])
 179                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 180                         return r;
 181
 182         return 0;
 183 }
 184
 185 static int mount_add_automount_links(Mount *m) {
 186         Meta *other;
 187         int r;
 188
 189         assert(m);
 190
 191         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT])
 192                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 193                         return r;
 194
 195         return 0;
 196 }
 197
 198 static int mount_add_socket_links(Mount *m) {
 199         Meta *other;
 200         int r;
 201
 202         assert(m);
 203
 204         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET])
 205                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 206                         return r;
 207
 208         return 0;
 209 }
 210
 211 static char* mount_test_option(const char *haystack, const char *needle) {
 212         struct mntent me;
 213
 214         assert(needle);
 215
 216         /* Like glibc's hasmntopt(), but works on a string, not a
 217          * struct mntent */
 218
 219         if (!haystack)
 220                 return false;
 221
 222         zero(me);
 223         me.mnt_opts = (char*) haystack;
 224
 225         return hasmntopt(&me, needle);
 226 }
 227
 228 static int mount_add_target_links(Mount *m) {
 229         const char *target;
 230         MountParameters *p;
 231         Unit *tu;
 232         int r;
 233         bool noauto, handle, automount, user;
 234
 235         assert(m);
 236
 237         if (m->from_fragment)
 238                 p = &m->parameters_fragment;
 239         else if (m->from_etc_fstab)
 240                 p = &m->parameters_etc_fstab;
 241         else
 242                 return 0;
 243
 244         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 245         user = mount_test_option(p->options, "user") || mount_test_option(p->options, "users");
 246         handle = !!mount_test_option(p->options, "comment=systemd.mount") ||
 247                 m->meta.manager->mount_auto;
 248         automount = !!mount_test_option(p->options, "comment=systemd.automount");
 249
 250         if (mount_test_option(p->options, "_netdev") ||
 251             fstype_is_network(p->fstype))
 252                 target = SPECIAL_REMOTE_FS_TARGET;
 253         else
 254                 target = SPECIAL_LOCAL_FS_TARGET;
 255
 256         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 257                 return r;
 258
 259         if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) {
 260                 Unit *am;
 261
 262                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 263                         return r;
 264
 265                 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 266         } else {
 267
 268                 /* Automatically add mount points that aren't natively
 269                  * configured to local-fs.target */
 270                 if (!noauto &&
 271                     handle &&
 272                     !m->from_fragment)
 273                         if (user || m->meta.manager->running_as == MANAGER_SYSTEM)
 274                                 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 275                                         return r;
 276
 277                 return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true);
 278         }
 279 }
 280
 281 static int mount_add_device_links(Mount *m) {
 282         MountParameters *p;
 283         bool nofail, noauto;
 284
 285         assert(m);
 286
 287         if (m->from_fragment)
 288                 p = &m->parameters_fragment;
 289         else if (m->from_etc_fstab)
 290                 p = &m->parameters_etc_fstab;
 291         else
 292                 return 0;
 293
 294         if (!p->what || path_equal(m->where, "/"))
 295                 return 0;
 296
 297         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 298         nofail = !!mount_test_option(p->options, "nofail");
 299
 300         return unit_add_node_link(UNIT(m), p->what,
 301                                   !noauto && nofail &&
 302                                   UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM);
 303 }
 304
 305 static int mount_add_default_dependencies(Mount *m) {
 306         int r;
 307
 308         assert(m);
 309
 310         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 311             !path_equal(m->where, "/")) {
 312
 313                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_FSCK_TARGET, NULL, true)) < 0)
 314                         return r;
 315
 316                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 317                         return r;
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int mount_verify(Mount *m) {
 324         bool b;
 325         char *e;
 326         assert(m);
 327
 328         if (m->meta.load_state != UNIT_LOADED)
 329                 return 0;
 330
 331         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 332                 return -ENOENT;
 333
 334         if (!(e = unit_name_from_path(m->where, ".mount")))
 335                 return -ENOMEM;
 336
 337         b = unit_has_name(UNIT(m), e);
 338         free(e);
 339
 340         if (!b) {
 341                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 342                 return -EINVAL;
 343         }
 344
 345         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 346                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 347                 return -EBADMSG;
 348         }
 349
 350         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 351                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 352                 return -EINVAL;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static int mount_load(Unit *u) {
 359         Mount *m = MOUNT(u);
 360         int r;
 361
 362         assert(u);
 363         assert(u->meta.load_state == UNIT_STUB);
 364
 365         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 366                 return r;
 367
 368         /* This is a new unit? Then let's add in some extras */
 369         if (u->meta.load_state == UNIT_LOADED) {
 370                 const char *what = NULL;
 371
 372                 if (m->meta.fragment_path)
 373                         m->from_fragment = true;
 374
 375                 if (!m->where)
 376                         if (!(m->where = unit_name_to_path(u->meta.id)))
 377                                 return -ENOMEM;
 378
 379                 path_kill_slashes(m->where);
 380
 381                 if (!m->meta.description)
 382                         if ((r = unit_set_description(u, m->where)) < 0)
 383                                 return r;
 384
 385                 if (m->from_fragment && m->parameters_fragment.what)
 386                         what = m->parameters_fragment.what;
 387                 else if (m->from_etc_fstab && m->parameters_etc_fstab.what)
 388                         what = m->parameters_etc_fstab.what;
 389                 else if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.what)
 390                         what = m->parameters_proc_self_mountinfo.what;
 391
 392                 if ((r = mount_add_device_links(m)) < 0)
 393                         return r;
 394
 395                 if ((r = mount_add_mount_links(m)) < 0)
 396                         return r;
 397
 398                 if ((r = mount_add_socket_links(m)) < 0)
 399                         return r;
 400
 401                 if ((r = mount_add_swap_links(m)) < 0)
 402                         return r;
 403
 404                 if ((r = mount_add_path_links(m)) < 0)
 405                         return r;
 406
 407                 if ((r = mount_add_automount_links(m)) < 0)
 408                         return r;
 409
 410                 if ((r = mount_add_target_links(m)) < 0)
 411                         return r;
 412
 413                 if ((r = unit_add_default_cgroup(u)) < 0)
 414                         return r;
 415
 416                 if (m->meta.default_dependencies)
 417                         if ((r = mount_add_default_dependencies(m)) < 0)
 418                                 return r;
 419         }
 420
 421         return mount_verify(m);
 422 }
 423
 424 static int mount_notify_automount(Mount *m, int status) {
 425         Unit *p;
 426         int r;
 427
 428         assert(m);
 429
 430         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 431                 return r == -ENOENT ? 0 : r;
 432
 433         return automount_send_ready(AUTOMOUNT(p), status);
 434 }
 435
 436 static void mount_set_state(Mount *m, MountState state) {
 437         MountState old_state;
 438         assert(m);
 439
 440         old_state = m->state;
 441         m->state = state;
 442
 443         if (state != MOUNT_MOUNTING &&
 444             state != MOUNT_MOUNTING_DONE &&
 445             state != MOUNT_REMOUNTING &&
 446             state != MOUNT_UNMOUNTING &&
 447             state != MOUNT_MOUNTING_SIGTERM &&
 448             state != MOUNT_MOUNTING_SIGKILL &&
 449             state != MOUNT_UNMOUNTING_SIGTERM &&
 450             state != MOUNT_UNMOUNTING_SIGKILL &&
 451             state != MOUNT_REMOUNTING_SIGTERM &&
 452             state != MOUNT_REMOUNTING_SIGKILL) {
 453                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 454                 mount_unwatch_control_pid(m);
 455                 m->control_command = NULL;
 456                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 457         }
 458
 459         if (state == MOUNT_MOUNTED ||
 460             state == MOUNT_REMOUNTING)
 461                 mount_notify_automount(m, 0);
 462         else if (state == MOUNT_DEAD ||
 463                  state == MOUNT_UNMOUNTING ||
 464                  state == MOUNT_MOUNTING_SIGTERM ||
 465                  state == MOUNT_MOUNTING_SIGKILL ||
 466                  state == MOUNT_REMOUNTING_SIGTERM ||
 467                  state == MOUNT_REMOUNTING_SIGKILL ||
 468                  state == MOUNT_UNMOUNTING_SIGTERM ||
 469                  state == MOUNT_UNMOUNTING_SIGKILL ||
 470                  state == MOUNT_FAILED)
 471                 mount_notify_automount(m, -ENODEV);
 472
 473         if (state != old_state)
 474                 log_debug("%s changed %s -> %s",
 475                           m->meta.id,
 476                           mount_state_to_string(old_state),
 477                           mount_state_to_string(state));
 478
 479         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 480 }
 481
 482 static int mount_coldplug(Unit *u) {
 483         Mount *m = MOUNT(u);
 484         MountState new_state = MOUNT_DEAD;
 485         int r;
 486
 487         assert(m);
 488         assert(m->state == MOUNT_DEAD);
 489
 490         if (m->deserialized_state != m->state)
 491                 new_state = m->deserialized_state;
 492         else if (m->from_proc_self_mountinfo)
 493                 new_state = MOUNT_MOUNTED;
 494
 495         if (new_state != m->state) {
 496
 497                 if (new_state == MOUNT_MOUNTING ||
 498                     new_state == MOUNT_MOUNTING_DONE ||
 499                     new_state == MOUNT_REMOUNTING ||
 500                     new_state == MOUNT_UNMOUNTING ||
 501                     new_state == MOUNT_MOUNTING_SIGTERM ||
 502                     new_state == MOUNT_MOUNTING_SIGKILL ||
 503                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 504                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 505                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 506                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 507
 508                         if (m->control_pid <= 0)
 509                                 return -EBADMSG;
 510
 511                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 512                                 return r;
 513
 514                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 515                                 return r;
 516                 }
 517
 518                 mount_set_state(m, new_state);
 519         }
 520
 521         return 0;
 522 }
 523
 524 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 525         Mount *m = MOUNT(u);
 526         MountParameters *p;
 527
 528         assert(m);
 529         assert(f);
 530
 531         if (m->from_proc_self_mountinfo)
 532                 p = &m->parameters_proc_self_mountinfo;
 533         else if (m->from_fragment)
 534                 p = &m->parameters_fragment;
 535         else
 536                 p = &m->parameters_etc_fstab;
 537
 538         fprintf(f,
 539                 "%sMount State: %s\n"
 540                 "%sWhere: %s\n"
 541                 "%sWhat: %s\n"
 542                 "%sFile System Type: %s\n"
 543                 "%sOptions: %s\n"
 544                 "%sFrom /etc/fstab: %s\n"
 545                 "%sFrom /proc/self/mountinfo: %s\n"
 546                 "%sFrom fragment: %s\n"
 547                 "%sDirectoryMode: %04o\n",
 548                 prefix, mount_state_to_string(m->state),
 549                 prefix, m->where,
 550                 prefix, strna(p->what),
 551                 prefix, strna(p->fstype),
 552                 prefix, strna(p->options),
 553                 prefix, yes_no(m->from_etc_fstab),
 554                 prefix, yes_no(m->from_proc_self_mountinfo),
 555                 prefix, yes_no(m->from_fragment),
 556                 prefix, m->directory_mode);
 557
 558         if (m->control_pid > 0)
 559                 fprintf(f,
 560                         "%sControl PID: %lu\n",
 561                         prefix, (unsigned long) m->control_pid);
 562
 563         exec_context_dump(&m->exec_context, f, prefix);
 564 }
 565
 566 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 567         pid_t pid;
 568         int r;
 569
 570         assert(m);
 571         assert(c);
 572         assert(_pid);
 573
 574         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 575                 goto fail;
 576
 577         if ((r = exec_spawn(c,
 578                             NULL,
 579                             &m->exec_context,
 580                             NULL, 0,
 581                             m->meta.manager->environment,
 582                             true,
 583                             true,
 584                             true,
 585                             m->meta.manager->confirm_spawn,
 586                             m->meta.cgroup_bondings,
 587                             &pid)) < 0)
 588                 goto fail;
 589
 590         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 591                 /* FIXME: we need to do something here */
 592                 goto fail;
 593
 594         *_pid = pid;
 595
 596         return 0;
 597
 598 fail:
 599         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 600
 601         return r;
 602 }
 603
 604 static void mount_enter_dead(Mount *m, bool success) {
 605         assert(m);
 606
 607         if (!success)
 608                 m->failure = true;
 609
 610         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 611 }
 612
 613 static void mount_enter_mounted(Mount *m, bool success) {
 614         assert(m);
 615
 616         if (!success)
 617                 m->failure = true;
 618
 619         mount_set_state(m, MOUNT_MOUNTED);
 620 }
 621
 622 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 623         int r;
 624         Set *pid_set = NULL;
 625         bool wait_for_exit = 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->control_pid > 0) {
 638                         if (kill(m->exec_context.kill_mode == KILL_PROCESS_GROUP ?
 639                                  -m->control_pid :
 640                                  m->control_pid, sig) < 0 && errno != ESRCH)
 641
 642                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 643                         else
 644                                 wait_for_exit = true;
 645                 }
 646
 647                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 648
 649                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 650                                 r = -ENOMEM;
 651                                 goto fail;
 652                         }
 653
 654                         /* Exclude the control pid from being killed via the cgroup */
 655                         if (m->control_pid > 0)
 656                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 657                                         goto fail;
 658
 659                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, pid_set)) < 0) {
 660                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 661                                         log_warning("Failed to kill control group: %s", strerror(-r));
 662                         } else if (r > 0)
 663                                 wait_for_exit = true;
 664
 665                         set_free(pid_set);
 666                 }
 667         }
 668
 669         if (wait_for_exit) {
 670                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 671                         goto fail;
 672
 673                 mount_set_state(m, state);
 674         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 675                 mount_enter_mounted(m, true);
 676         else
 677                 mount_enter_dead(m, true);
 678
 679         return;
 680
 681 fail:
 682         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 683
 684         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 685                 mount_enter_mounted(m, false);
 686         else
 687                 mount_enter_dead(m, false);
 688
 689         if (pid_set)
 690                 set_free(pid_set);
 691 }
 692
 693 static void mount_enter_unmounting(Mount *m, bool success) {
 694         int r;
 695
 696         assert(m);
 697
 698         if (!success)
 699                 m->failure = true;
 700
 701         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 702         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 703
 704         if ((r = exec_command_set(
 705                              m->control_command,
 706                              "/bin/umount",
 707                              m->where,
 708                              NULL)) < 0)
 709                 goto fail;
 710
 711         mount_unwatch_control_pid(m);
 712
 713         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 714                 goto fail;
 715
 716         mount_set_state(m, MOUNT_UNMOUNTING);
 717
 718         return;
 719
 720 fail:
 721         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 722         mount_enter_mounted(m, false);
 723 }
 724
 725 static void mount_enter_mounting(Mount *m) {
 726         int r;
 727
 728         assert(m);
 729
 730         m->control_command_id = MOUNT_EXEC_MOUNT;
 731         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 732
 733         mkdir_p(m->where, m->directory_mode);
 734
 735         if (m->from_fragment)
 736                 r = exec_command_set(
 737                                 m->control_command,
 738                                 "/bin/mount",
 739                                 m->parameters_fragment.what,
 740                                 m->where,
 741                                 "-t", m->parameters_fragment.fstype,
 742                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 743                                 NULL);
 744         else if (m->from_etc_fstab)
 745                 r = exec_command_set(
 746                                 m->control_command,
 747                                 "/bin/mount",
 748                                 m->where,
 749                                 NULL);
 750         else
 751                 r = -ENOENT;
 752
 753         if (r < 0)
 754                 goto fail;
 755
 756         mount_unwatch_control_pid(m);
 757
 758         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 759                 goto fail;
 760
 761         mount_set_state(m, MOUNT_MOUNTING);
 762
 763         return;
 764
 765 fail:
 766         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 767         mount_enter_dead(m, false);
 768 }
 769
 770 static void mount_enter_mounting_done(Mount *m) {
 771         assert(m);
 772
 773         mount_set_state(m, MOUNT_MOUNTING_DONE);
 774 }
 775
 776 static void mount_enter_remounting(Mount *m, bool success) {
 777         int r;
 778
 779         assert(m);
 780
 781         if (!success)
 782                 m->failure = true;
 783
 784         m->control_command_id = MOUNT_EXEC_REMOUNT;
 785         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 786
 787         if (m->from_fragment) {
 788                 char *buf = NULL;
 789                 const char *o;
 790
 791                 if (m->parameters_fragment.options) {
 792                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 793                                 r = -ENOMEM;
 794                                 goto fail;
 795                         }
 796
 797                         o = buf;
 798                 } else
 799                         o = "remount";
 800
 801                 r = exec_command_set(
 802                                 m->control_command,
 803                                 "/bin/mount",
 804                                 m->parameters_fragment.what,
 805                                 m->where,
 806                                 "-t", m->parameters_fragment.fstype,
 807                                 "-o", o,
 808                                 NULL);
 809
 810                 free(buf);
 811         } else if (m->from_etc_fstab)
 812                 r = exec_command_set(
 813                                 m->control_command,
 814                                 "/bin/mount",
 815                                 m->where,
 816                                 "-o", "remount",
 817                                 NULL);
 818         else
 819                 r = -ENOENT;
 820
 821         if (r < 0) {
 822                 r = -ENOMEM;
 823                 goto fail;
 824         }
 825
 826         mount_unwatch_control_pid(m);
 827
 828         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 829                 goto fail;
 830
 831         mount_set_state(m, MOUNT_REMOUNTING);
 832
 833         return;
 834
 835 fail:
 836         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 837         mount_enter_mounted(m, false);
 838 }
 839
 840 static int mount_start(Unit *u) {
 841         Mount *m = MOUNT(u);
 842
 843         assert(m);
 844
 845         /* We cannot fulfill this request right now, try again later
 846          * please! */
 847         if (m->state == MOUNT_UNMOUNTING ||
 848             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 849             m->state == MOUNT_UNMOUNTING_SIGKILL)
 850                 return -EAGAIN;
 851
 852         /* Already on it! */
 853         if (m->state == MOUNT_MOUNTING ||
 854             m->state == MOUNT_MOUNTING_SIGTERM ||
 855             m->state == MOUNT_MOUNTING_SIGKILL)
 856                 return 0;
 857
 858         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
 859
 860         m->failure = false;
 861         mount_enter_mounting(m);
 862         return 0;
 863 }
 864
 865 static int mount_stop(Unit *u) {
 866         Mount *m = MOUNT(u);
 867
 868         assert(m);
 869
 870         /* Already on it */
 871         if (m->state == MOUNT_UNMOUNTING ||
 872             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 873             m->state == MOUNT_UNMOUNTING_SIGTERM)
 874                 return 0;
 875
 876         assert(m->state == MOUNT_MOUNTING ||
 877                m->state == MOUNT_MOUNTING_DONE ||
 878                m->state == MOUNT_MOUNTED ||
 879                m->state == MOUNT_MOUNTING_SIGTERM ||
 880                m->state == MOUNT_MOUNTING_SIGKILL ||
 881                m->state == MOUNT_REMOUNTING ||
 882                m->state == MOUNT_REMOUNTING_SIGTERM ||
 883                m->state == MOUNT_REMOUNTING_SIGKILL);
 884
 885         mount_enter_unmounting(m, true);
 886         return 0;
 887 }
 888
 889 static int mount_reload(Unit *u) {
 890         Mount *m = MOUNT(u);
 891
 892         assert(m);
 893
 894         if (m->state == MOUNT_MOUNTING_DONE)
 895                 return -EAGAIN;
 896
 897         assert(m->state == MOUNT_MOUNTED);
 898
 899         mount_enter_remounting(m, true);
 900         return 0;
 901 }
 902
 903 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
 904         Mount *m = MOUNT(u);
 905
 906         assert(m);
 907         assert(f);
 908         assert(fds);
 909
 910         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
 911         unit_serialize_item(u, f, "failure", yes_no(m->failure));
 912
 913         if (m->control_pid > 0)
 914                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
 915
 916         if (m->control_command_id >= 0)
 917                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
 918
 919         return 0;
 920 }
 921
 922 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 923         Mount *m = MOUNT(u);
 924
 925         assert(u);
 926         assert(key);
 927         assert(value);
 928         assert(fds);
 929
 930         if (streq(key, "state")) {
 931                 MountState state;
 932
 933                 if ((state = mount_state_from_string(value)) < 0)
 934                         log_debug("Failed to parse state value %s", value);
 935                 else
 936                         m->deserialized_state = state;
 937         } else if (streq(key, "failure")) {
 938                 int b;
 939
 940                 if ((b = parse_boolean(value)) < 0)
 941                         log_debug("Failed to parse failure value %s", value);
 942                 else
 943                         m->failure = b || m->failure;
 944
 945         } else if (streq(key, "control-pid")) {
 946                 pid_t pid;
 947
 948                 if (parse_pid(value, &pid) < 0)
 949                         log_debug("Failed to parse control-pid value %s", value);
 950                 else
 951                         m->control_pid = pid;
 952         } else if (streq(key, "control-command")) {
 953                 MountExecCommand id;
 954
 955                 if ((id = mount_exec_command_from_string(value)) < 0)
 956                         log_debug("Failed to parse exec-command value %s", value);
 957                 else {
 958                         m->control_command_id = id;
 959                         m->control_command = m->exec_command + id;
 960                 }
 961
 962         } else
 963                 log_debug("Unknown serialization key '%s'", key);
 964
 965         return 0;
 966 }
 967
 968 static UnitActiveState mount_active_state(Unit *u) {
 969         assert(u);
 970
 971         return state_translation_table[MOUNT(u)->state];
 972 }
 973
 974 static const char *mount_sub_state_to_string(Unit *u) {
 975         assert(u);
 976
 977         return mount_state_to_string(MOUNT(u)->state);
 978 }
 979
 980 static bool mount_check_gc(Unit *u) {
 981         Mount *m = MOUNT(u);
 982
 983         assert(m);
 984
 985         return m->from_etc_fstab || m->from_proc_self_mountinfo;
 986 }
 987
 988 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 989         Mount *m = MOUNT(u);
 990         bool success;
 991
 992         assert(m);
 993         assert(pid >= 0);
 994
 995         if (pid != m->control_pid)
 996                 return;
 997
 998         m->control_pid = 0;
 999
1000         success = is_clean_exit(code, status);
1001         m->failure = m->failure || !success;
1002
1003         if (m->control_command) {
1004                 exec_status_exit(&m->control_command->exec_status, pid, code, status);
1005                 m->control_command = NULL;
1006                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1007         }
1008
1009         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1010                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1011
1012         /* Note that mount(8) returning and the kernel sending us a
1013          * mount table change event might happen out-of-order. If an
1014          * operation succeed we assume the kernel will follow soon too
1015          * and already change into the resulting state.  If it fails
1016          * we check if the kernel still knows about the mount. and
1017          * change state accordingly. */
1018
1019         switch (m->state) {
1020
1021         case MOUNT_MOUNTING:
1022         case MOUNT_MOUNTING_DONE:
1023         case MOUNT_MOUNTING_SIGKILL:
1024         case MOUNT_MOUNTING_SIGTERM:
1025         case MOUNT_REMOUNTING:
1026         case MOUNT_REMOUNTING_SIGKILL:
1027         case MOUNT_REMOUNTING_SIGTERM:
1028
1029                 if (success)
1030                         mount_enter_mounted(m, true);
1031                 else if (m->from_proc_self_mountinfo)
1032                         mount_enter_mounted(m, false);
1033                 else
1034                         mount_enter_dead(m, false);
1035                 break;
1036
1037         case MOUNT_UNMOUNTING:
1038         case MOUNT_UNMOUNTING_SIGKILL:
1039         case MOUNT_UNMOUNTING_SIGTERM:
1040
1041                 if (success)
1042                         mount_enter_dead(m, true);
1043                 else if (m->from_proc_self_mountinfo)
1044                         mount_enter_mounted(m, false);
1045                 else
1046                         mount_enter_dead(m, false);
1047                 break;
1048
1049         default:
1050                 assert_not_reached("Uh, control process died at wrong time.");
1051         }
1052
1053         /* Notify clients about changed exit status */
1054         unit_add_to_dbus_queue(u);
1055 }
1056
1057 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1058         Mount *m = MOUNT(u);
1059
1060         assert(m);
1061         assert(elapsed == 1);
1062         assert(w == &m->timer_watch);
1063
1064         switch (m->state) {
1065
1066         case MOUNT_MOUNTING:
1067         case MOUNT_MOUNTING_DONE:
1068                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1069                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1070                 break;
1071
1072         case MOUNT_REMOUNTING:
1073                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1074                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
1075                 break;
1076
1077         case MOUNT_UNMOUNTING:
1078                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1079                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1080                 break;
1081
1082         case MOUNT_MOUNTING_SIGTERM:
1083                 log_warning("%s mounting timed out. Killing.", u->meta.id);
1084                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1085                 break;
1086
1087         case MOUNT_REMOUNTING_SIGTERM:
1088                 log_warning("%s remounting timed out. Killing.", u->meta.id);
1089                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1090                 break;
1091
1092         case MOUNT_UNMOUNTING_SIGTERM:
1093                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
1094                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1095                 break;
1096
1097         case MOUNT_MOUNTING_SIGKILL:
1098         case MOUNT_REMOUNTING_SIGKILL:
1099         case MOUNT_UNMOUNTING_SIGKILL:
1100                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1101
1102                 if (m->from_proc_self_mountinfo)
1103                         mount_enter_mounted(m, false);
1104                 else
1105                         mount_enter_dead(m, false);
1106                 break;
1107
1108         default:
1109                 assert_not_reached("Timeout at wrong time.");
1110         }
1111 }
1112
1113 static int mount_add_one(
1114                 Manager *m,
1115                 const char *what,
1116                 const char *where,
1117                 const char *options,
1118                 const char *fstype,
1119                 bool from_proc_self_mountinfo,
1120                 bool set_flags) {
1121         int r;
1122         Unit *u;
1123         bool delete;
1124         char *e, *w = NULL, *o = NULL, *f = NULL;
1125         MountParameters *p;
1126
1127         assert(m);
1128         assert(what);
1129         assert(where);
1130         assert(options);
1131         assert(fstype);
1132
1133         assert(!set_flags || from_proc_self_mountinfo);
1134
1135         /* Ignore API mount points. They should never be referenced in
1136          * dependencies ever. */
1137         if (mount_point_is_api(where))
1138                 return 0;
1139
1140         if (streq(fstype, "autofs"))
1141                 return 0;
1142
1143         /* probably some kind of swap, ignore */
1144         if (!is_path(where))
1145                 return 0;
1146
1147         if (!(e = unit_name_from_path(where, ".mount")))
1148                 return -ENOMEM;
1149
1150         if (!(u = manager_get_unit(m, e))) {
1151                 delete = true;
1152
1153                 if (!(u = unit_new(m))) {
1154                         free(e);
1155                         return -ENOMEM;
1156                 }
1157
1158                 r = unit_add_name(u, e);
1159                 free(e);
1160
1161                 if (r < 0)
1162                         goto fail;
1163
1164                 if (!(MOUNT(u)->where = strdup(where))) {
1165                         r = -ENOMEM;
1166                         goto fail;
1167                 }
1168
1169                 unit_add_to_load_queue(u);
1170         } else {
1171                 delete = false;
1172                 free(e);
1173         }
1174
1175         if (!(w = strdup(what)) ||
1176             !(o = strdup(options)) ||
1177             !(f = strdup(fstype))) {
1178                 r = -ENOMEM;
1179                 goto fail;
1180         }
1181
1182         if (from_proc_self_mountinfo) {
1183                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1184
1185                 if (set_flags) {
1186                         MOUNT(u)->is_mounted = true;
1187                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1188                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1189                 }
1190
1191                 MOUNT(u)->from_proc_self_mountinfo = true;
1192         } else {
1193                 p = &MOUNT(u)->parameters_etc_fstab;
1194                 MOUNT(u)->from_etc_fstab = true;
1195         }
1196
1197         free(p->what);
1198         p->what = w;
1199
1200         free(p->options);
1201         p->options = o;
1202
1203         free(p->fstype);
1204         p->fstype = f;
1205
1206         unit_add_to_dbus_queue(u);
1207
1208         return 0;
1209
1210 fail:
1211         free(w);
1212         free(o);
1213         free(f);
1214
1215         if (delete && u)
1216                 unit_free(u);
1217
1218         return r;
1219 }
1220
1221 static char *fstab_node_to_udev_node(char *p) {
1222         char *dn, *t, *u;
1223         int r;
1224
1225         /* FIXME: to follow udev's logic 100% we need to leave valid
1226          * UTF8 chars unescaped */
1227
1228         if (startswith(p, "LABEL=")) {
1229
1230                 if (!(u = unquote(p+6, "\"\'")))
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-label/%s", t);
1240                 free(t);
1241
1242                 if (r < 0)
1243                         return NULL;
1244
1245                 return dn;
1246         }
1247
1248         if (startswith(p, "UUID=")) {
1249
1250                 if (!(u = unquote(p+5, "\"\'")))
1251                         return NULL;
1252
1253                 t = xescape(u, "/ ");
1254                 free(u);
1255
1256                 if (!t)
1257                         return NULL;
1258
1259                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
1260                 free(t);
1261
1262                 if (r < 0)
1263                         return NULL;
1264
1265                 return dn;
1266         }
1267
1268         return strdup(p);
1269 }
1270
1271 static int mount_find_pri(char *options) {
1272         char *end, *pri;
1273         unsigned long r;
1274
1275         if (!(pri = mount_test_option(options, "pri=")))
1276                 return 0;
1277
1278         pri += 4;
1279
1280         errno = 0;
1281         r = strtoul(pri, &end, 10);
1282
1283         if (errno != 0)
1284                 return -errno;
1285
1286         if (end == pri || (*end != ',' && *end != 0))
1287                 return -EINVAL;
1288
1289         return (int) r;
1290 }
1291
1292 static int mount_load_etc_fstab(Manager *m) {
1293         FILE *f;
1294         int r;
1295         struct mntent* me;
1296
1297         assert(m);
1298
1299         errno = 0;
1300         if (!(f = setmntent("/etc/fstab", "r")))
1301                 return -errno;
1302
1303         while ((me = getmntent(f))) {
1304                 char *where, *what;
1305
1306                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1307                         r = -ENOMEM;
1308                         goto finish;
1309                 }
1310
1311                 if (!(where = strdup(me->mnt_dir))) {
1312                         free(what);
1313                         r = -ENOMEM;
1314                         goto finish;
1315                 }
1316
1317                 if (what[0] == '/')
1318                         path_kill_slashes(what);
1319
1320                 if (where[0] == '/')
1321                         path_kill_slashes(where);
1322
1323                 if (streq(me->mnt_type, "swap")) {
1324                         int pri;
1325
1326                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1327                                 r = pri;
1328                         else
1329                                 r = swap_add_one(m,
1330                                                  what,
1331                                                  pri,
1332                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1333                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1334                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1335                                                  false);
1336                 } else
1337                         r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1338
1339                 free(what);
1340                 free(where);
1341
1342                 if (r < 0)
1343                         goto finish;
1344         }
1345
1346         r = 0;
1347 finish:
1348
1349         endmntent(f);
1350         return r;
1351 }
1352
1353 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1354         int r;
1355         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1356
1357         assert(m);
1358
1359         rewind(m->proc_self_mountinfo);
1360
1361         for (;;) {
1362                 int k;
1363
1364                 device = path = options = options2 = fstype = d = p = o = NULL;
1365
1366                 if ((k = fscanf(m->proc_self_mountinfo,
1367                                 "%*s "       /* (1) mount id */
1368                                 "%*s "       /* (2) parent id */
1369                                 "%*s "       /* (3) major:minor */
1370                                 "%*s "       /* (4) root */
1371                                 "%ms "       /* (5) mount point */
1372                                 "%ms"        /* (6) mount options */
1373                                 "%*[^-]"     /* (7) optional fields */
1374                                 "- "         /* (8) seperator */
1375                                 "%ms "       /* (9) file system type */
1376                                 "%ms"        /* (10) mount source */
1377                                 "%ms"        /* (11) mount options 2 */
1378                                 "%*[^\n]",   /* some rubbish at the end */
1379                                 &path,
1380                                 &options,
1381                                 &fstype,
1382                                 &device,
1383                                 &options2)) != 5) {
1384
1385                         if (k == EOF)
1386                                 break;
1387
1388                         r = -EBADMSG;
1389                         goto finish;
1390                 }
1391
1392                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1393                         r = -ENOMEM;
1394                         goto finish;
1395                 }
1396
1397                 if (!(d = cunescape(device)) ||
1398                     !(p = cunescape(path))) {
1399                         r = -ENOMEM;
1400                         goto finish;
1401                 }
1402
1403                 if ((r = mount_add_one(m, d, p, o, fstype, true, set_flags)) < 0)
1404                         goto finish;
1405
1406                 free(device);
1407                 free(path);
1408                 free(options);
1409                 free(options2);
1410                 free(fstype);
1411                 free(d);
1412                 free(p);
1413                 free(o);
1414         }
1415
1416         r = 0;
1417
1418 finish:
1419         free(device);
1420         free(path);
1421         free(options);
1422         free(options2);
1423         free(fstype);
1424         free(d);
1425         free(p);
1426         free(o);
1427
1428         return r;
1429 }
1430
1431 static void mount_shutdown(Manager *m) {
1432         assert(m);
1433
1434         if (m->proc_self_mountinfo) {
1435                 fclose(m->proc_self_mountinfo);
1436                 m->proc_self_mountinfo = NULL;
1437         }
1438 }
1439
1440 static int mount_enumerate(Manager *m) {
1441         int r;
1442         struct epoll_event ev;
1443         assert(m);
1444
1445         if (!m->proc_self_mountinfo) {
1446                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1447                         return -errno;
1448
1449                 m->mount_watch.type = WATCH_MOUNT;
1450                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1451
1452                 zero(ev);
1453                 ev.events = EPOLLERR;
1454                 ev.data.ptr = &m->mount_watch;
1455
1456                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1457                         return -errno;
1458         }
1459
1460         if ((r = mount_load_etc_fstab(m)) < 0)
1461                 goto fail;
1462
1463         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1464                 goto fail;
1465
1466         return 0;
1467
1468 fail:
1469         mount_shutdown(m);
1470         return r;
1471 }
1472
1473 void mount_fd_event(Manager *m, int events) {
1474         Meta *meta;
1475         int r;
1476
1477         assert(m);
1478         assert(events == EPOLLERR);
1479
1480         /* The manager calls this for every fd event happening on the
1481          * /proc/self/mountinfo file, which informs us about mounting
1482          * table changes */
1483
1484         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1485                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1486
1487                 /* Reset flags, just in case, for later calls */
1488                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1489                         Mount *mount = (Mount*) meta;
1490
1491                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1492                 }
1493
1494                 return;
1495         }
1496
1497         manager_dispatch_load_queue(m);
1498
1499         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1500                 Mount *mount = (Mount*) meta;
1501
1502                 if (!mount->is_mounted) {
1503                         /* This has just been unmounted. */
1504
1505                         mount->from_proc_self_mountinfo = false;
1506
1507                         switch (mount->state) {
1508
1509                         case MOUNT_MOUNTED:
1510                                 mount_enter_dead(mount, true);
1511                                 break;
1512
1513                         default:
1514                                 mount_set_state(mount, mount->state);
1515                                 break;
1516
1517                         }
1518
1519                 } else if (mount->just_mounted || mount->just_changed) {
1520
1521                         /* New or changed entrymount */
1522
1523                         switch (mount->state) {
1524
1525                         case MOUNT_DEAD:
1526                         case MOUNT_FAILED:
1527                                 mount_enter_mounted(mount, true);
1528                                 break;
1529
1530                         case MOUNT_MOUNTING:
1531                                 mount_enter_mounting_done(mount);
1532                                 break;
1533
1534                         default:
1535                                 /* Nothing really changed, but let's
1536                                  * issue an notification call
1537                                  * nonetheless, in case somebody is
1538                                  * waiting for this. (e.g. file system
1539                                  * ro/rw remounts.) */
1540                                 mount_set_state(mount, mount->state);
1541                                 break;
1542                         }
1543                 }
1544
1545                 /* Reset the flags for later calls */
1546                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1547         }
1548 }
1549
1550 static void mount_reset_failed(Unit *u) {
1551         Mount *m = MOUNT(u);
1552
1553         assert(m);
1554
1555         if (m->state == MOUNT_FAILED)
1556                 mount_set_state(m, MOUNT_DEAD);
1557
1558         m->failure = false;
1559 }
1560
1561 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1562         [MOUNT_DEAD] = "dead",
1563         [MOUNT_MOUNTING] = "mounting",
1564         [MOUNT_MOUNTING_DONE] = "mounting-done",
1565         [MOUNT_MOUNTED] = "mounted",
1566         [MOUNT_REMOUNTING] = "remounting",
1567         [MOUNT_UNMOUNTING] = "unmounting",
1568         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1569         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1570         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1571         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1572         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1573         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1574         [MOUNT_FAILED] = "failed"
1575 };
1576
1577 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1578
1579 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1580         [MOUNT_EXEC_MOUNT] = "ExecMount",
1581         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1582         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1583 };
1584
1585 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1586
1587 const UnitVTable mount_vtable = {
1588         .suffix = ".mount",
1589
1590         .no_alias = true,
1591         .no_instances = true,
1592         .no_isolate = true,
1593         .show_status = true,
1594
1595         .init = mount_init,
1596         .load = mount_load,
1597         .done = mount_done,
1598
1599         .coldplug = mount_coldplug,
1600
1601         .dump = mount_dump,
1602
1603         .start = mount_start,
1604         .stop = mount_stop,
1605         .reload = mount_reload,
1606
1607         .serialize = mount_serialize,
1608         .deserialize_item = mount_deserialize_item,
1609
1610         .active_state = mount_active_state,
1611         .sub_state_to_string = mount_sub_state_to_string,
1612
1613         .check_gc = mount_check_gc,
1614
1615         .sigchld_event = mount_sigchld_event,
1616         .timer_event = mount_timer_event,
1617
1618         .reset_failed = mount_reset_failed,
1619
1620         .bus_interface = "org.freedesktop.systemd1.Mount",
1621         .bus_message_handler = bus_mount_message_handler,
1622         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1623
1624         .enumerate = mount_enumerate,
1625         .shutdown = mount_shutdown
1626 };