src/mount.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <mntent.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27
  28 #include "unit.h"
  29 #include "mount.h"
  30 #include "load-fragment.h"
  31 #include "load-dropin.h"
  32 #include "log.h"
  33 #include "strv.h"
  34 #include "mount-setup.h"
  35 #include "unit-name.h"
  36 #include "dbus-mount.h"
  37 #include "special.h"
  38 #include "bus-errors.h"
  39 #include "exit-status.h"
  40 #include "def.h"
  41
  42 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  43         [MOUNT_DEAD] = UNIT_INACTIVE,
  44         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  45         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  46         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  47         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  48         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  49         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  50         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  51         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  52         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  53         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  54         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  55         [MOUNT_FAILED] = UNIT_FAILED
  56 };
  57
  58 static void mount_init(Unit *u) {
  59         Mount *m = MOUNT(u);
  60
  61         assert(u);
  62         assert(u->meta.load_state == UNIT_STUB);
  63
  64         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  65         m->directory_mode = 0755;
  66
  67         exec_context_init(&m->exec_context);
  68
  69         /* The stdio/kmsg bridge socket is on /, in order to avoid a
  70          * dep loop, don't use kmsg logging for -.mount */
  71         if (!unit_has_name(u, "-.mount")) {
  72                 m->exec_context.std_output = u->meta.manager->default_std_output;
  73                 m->exec_context.std_error = u->meta.manager->default_std_error;
  74         }
  75
  76         /* We need to make sure that /bin/mount is always called in
  77          * the same process group as us, so that the autofs kernel
  78          * side doesn't send us another mount request while we are
  79          * already trying to comply its last one. */
  80         m->exec_context.same_pgrp = true;
  81
  82         m->timer_watch.type = WATCH_INVALID;
  83
  84         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  85
  86         m->meta.ignore_on_isolate = true;
  87 }
  88
  89 static void mount_unwatch_control_pid(Mount *m) {
  90         assert(m);
  91
  92         if (m->control_pid <= 0)
  93                 return;
  94
  95         unit_unwatch_pid(UNIT(m), m->control_pid);
  96         m->control_pid = 0;
  97 }
  98
  99 static void mount_parameters_done(MountParameters *p) {
 100         assert(p);
 101
 102         free(p->what);
 103         free(p->options);
 104         free(p->fstype);
 105
 106         p->what = p->options = p->fstype = NULL;
 107 }
 108
 109 static void mount_done(Unit *u) {
 110         Mount *m = MOUNT(u);
 111
 112         assert(m);
 113
 114         free(m->where);
 115         m->where = NULL;
 116
 117         mount_parameters_done(&m->parameters_etc_fstab);
 118         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 119         mount_parameters_done(&m->parameters_fragment);
 120
 121         exec_context_done(&m->exec_context);
 122         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 123         m->control_command = NULL;
 124
 125         mount_unwatch_control_pid(m);
 126
 127         unit_unwatch_timer(u, &m->timer_watch);
 128 }
 129
 130 static MountParameters* get_mount_parameters_configured(Mount *m) {
 131         assert(m);
 132
 133         if (m->from_fragment)
 134                 return &m->parameters_fragment;
 135         else if (m->from_etc_fstab)
 136                 return &m->parameters_etc_fstab;
 137
 138         return NULL;
 139 }
 140
 141 static MountParameters* get_mount_parameters(Mount *m) {
 142         assert(m);
 143
 144         if (m->from_proc_self_mountinfo)
 145                 return &m->parameters_proc_self_mountinfo;
 146
 147         return get_mount_parameters_configured(m);
 148 }
 149
 150 static int mount_add_mount_links(Mount *m) {
 151         Meta *other;
 152         int r;
 153         MountParameters *pm;
 154
 155         assert(m);
 156
 157         pm = get_mount_parameters_configured(m);
 158
 159         /* Adds in links to other mount points that might lie below or
 160          * above us in the hierarchy */
 161
 162         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_MOUNT]) {
 163                 Mount *n = (Mount*) other;
 164                 MountParameters *pn;
 165
 166                 if (n == m)
 167                         continue;
 168
 169                 if (n->meta.load_state != UNIT_LOADED)
 170                         continue;
 171
 172                 pn = get_mount_parameters_configured(n);
 173
 174                 if (path_startswith(m->where, n->where)) {
 175
 176                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 177                                 return r;
 178
 179                         if (pn)
 180                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 181                                         return r;
 182
 183                 } else if (path_startswith(n->where, m->where)) {
 184
 185                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 186                                 return r;
 187
 188                         if (pm)
 189                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 190                                         return r;
 191
 192                 } else if (pm && path_startswith(pm->what, n->where)) {
 193
 194                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 195                                 return r;
 196
 197                         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 198                                 return r;
 199
 200                 } else if (pn && path_startswith(pn->what, m->where)) {
 201
 202                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 203                                 return r;
 204
 205                         if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 206                                 return r;
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 static int mount_add_swap_links(Mount *m) {
 214         Meta *other;
 215         int r;
 216
 217         assert(m);
 218
 219         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SWAP])
 220                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 221                         return r;
 222
 223         return 0;
 224 }
 225
 226 static int mount_add_path_links(Mount *m) {
 227         Meta *other;
 228         int r;
 229
 230         assert(m);
 231
 232         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_PATH])
 233                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 234                         return r;
 235
 236         return 0;
 237 }
 238
 239 static int mount_add_automount_links(Mount *m) {
 240         Meta *other;
 241         int r;
 242
 243         assert(m);
 244
 245         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_AUTOMOUNT])
 246                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 247                         return r;
 248
 249         return 0;
 250 }
 251
 252 static int mount_add_socket_links(Mount *m) {
 253         Meta *other;
 254         int r;
 255
 256         assert(m);
 257
 258         LIST_FOREACH(units_by_type, other, m->meta.manager->units_by_type[UNIT_SOCKET])
 259                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 260                         return r;
 261
 262         return 0;
 263 }
 264
 265 static char* mount_test_option(const char *haystack, const char *needle) {
 266         struct mntent me;
 267
 268         assert(needle);
 269
 270         /* Like glibc's hasmntopt(), but works on a string, not a
 271          * struct mntent */
 272
 273         if (!haystack)
 274                 return false;
 275
 276         zero(me);
 277         me.mnt_opts = (char*) haystack;
 278
 279         return hasmntopt(&me, needle);
 280 }
 281
 282 static bool mount_is_network(MountParameters *p) {
 283         assert(p);
 284
 285         if (mount_test_option(p->options, "_netdev"))
 286                 return true;
 287
 288         if (p->fstype && fstype_is_network(p->fstype))
 289                 return true;
 290
 291         return false;
 292 }
 293
 294 static bool mount_is_bind(MountParameters *p) {
 295         assert(p);
 296
 297         if (mount_test_option(p->options, "bind"))
 298                 return true;
 299
 300         if (p->fstype && streq(p->fstype, "bind"))
 301                 return true;
 302
 303         return false;
 304 }
 305
 306 static bool needs_quota(MountParameters *p) {
 307         assert(p);
 308
 309         if (mount_is_network(p))
 310                 return false;
 311
 312         if (mount_is_bind(p))
 313                 return false;
 314
 315         return mount_test_option(p->options, "usrquota") ||
 316                 mount_test_option(p->options, "grpquota") ||
 317                 mount_test_option(p->options, "quota") ||
 318                 mount_test_option(p->options, "usrjquota") ||
 319                 mount_test_option(p->options, "grpjquota");
 320 }
 321
 322 static int mount_add_fstab_links(Mount *m) {
 323         const char *target, *after = NULL, *after2 = NULL;
 324         MountParameters *p;
 325         Unit *tu;
 326         int r;
 327         bool noauto, nofail, handle, automount;
 328
 329         assert(m);
 330
 331         if (m->meta.manager->running_as != MANAGER_SYSTEM)
 332                 return 0;
 333
 334         if (!(p = get_mount_parameters_configured(m)))
 335                 return 0;
 336
 337         if (p != &m->parameters_etc_fstab)
 338                 return 0;
 339
 340         noauto = !!mount_test_option(p->options, "noauto");
 341         nofail = !!mount_test_option(p->options, "nofail");
 342         automount =
 343                 mount_test_option(p->options, "comment=systemd.automount") ||
 344                 mount_test_option(p->options, "x-systemd-automount");
 345         handle =
 346                 automount ||
 347                 mount_test_option(p->options, "comment=systemd.mount") ||
 348                 mount_test_option(p->options, "x-systemd-mount") ||
 349                 m->meta.manager->mount_auto;
 350
 351         if (mount_is_network(p)) {
 352                 target = SPECIAL_REMOTE_FS_TARGET;
 353                 after = SPECIAL_REMOTE_FS_PRE_TARGET;
 354                 after2 = SPECIAL_NETWORK_TARGET;
 355         } else {
 356                 target = SPECIAL_LOCAL_FS_TARGET;
 357                 after = SPECIAL_LOCAL_FS_PRE_TARGET;
 358         }
 359
 360         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 361                 return r;
 362
 363         if (after)
 364                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0)
 365                         return r;
 366
 367         if (after2)
 368                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after2, NULL, true)) < 0)
 369                         return r;
 370
 371         if (automount) {
 372                 Unit *am;
 373
 374                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 375                         return r;
 376
 377                 /* If auto is configured as well also pull in the
 378                  * mount right-away, but don't rely on it. */
 379                 if (!noauto) /* automount + auto */
 380                         if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 381                                 return r;
 382
 383                 /* Install automount unit */
 384                 if (!nofail) /* automount + fail */
 385                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(am), true);
 386                 else /* automount + nofail */
 387                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 388
 389         } else if (handle && !noauto) {
 390
 391                 /* Automatically add mount points that aren't natively
 392                  * configured to local-fs.target */
 393
 394                 if (!nofail) /* auto + fail */
 395                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
 396                 else /* auto + nofail */
 397                         return unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true);
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int mount_add_device_links(Mount *m) {
 404         MountParameters *p;
 405         int r;
 406
 407         assert(m);
 408
 409         if (!(p = get_mount_parameters_configured(m)))
 410                 return 0;
 411
 412         if (!p->what)
 413                 return 0;
 414
 415         if (!mount_is_bind(p) &&
 416             !path_equal(m->where, "/") &&
 417             p == &m->parameters_etc_fstab) {
 418                 bool nofail, noauto;
 419
 420                 noauto = !!mount_test_option(p->options, "noauto");
 421                 nofail = !!mount_test_option(p->options, "nofail");
 422
 423                 if ((r = unit_add_node_link(UNIT(m), p->what,
 424                                             !noauto && nofail &&
 425                                             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
 426                         return r;
 427         }
 428
 429         if (p->passno > 0 &&
 430             !mount_is_bind(p) &&
 431             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
 432             !path_equal(m->where, "/")) {
 433                 char *name;
 434                 Unit *fsck;
 435                 /* Let's add in the fsck service */
 436
 437                 /* aka SPECIAL_FSCK_SERVICE */
 438                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 439                         return -ENOMEM;
 440
 441                 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
 442                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 443                         free(name);
 444                         return r;
 445                 }
 446
 447                 free(name);
 448
 449                 SERVICE(fsck)->fsck_passno = p->passno;
 450
 451                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 452                         return r;
 453         }
 454
 455         return 0;
 456 }
 457
 458 static int mount_add_default_dependencies(Mount *m) {
 459         int r;
 460         MountParameters *p;
 461
 462         assert(m);
 463
 464         if (m->meta.manager->running_as != MANAGER_SYSTEM)
 465                 return 0;
 466
 467         p = get_mount_parameters_configured(m);
 468         if (p && needs_quota(p)) {
 469                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
 470                     (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
 471                         return r;
 472         }
 473
 474         if (!path_equal(m->where, "/"))
 475                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 476                         return r;
 477
 478         return 0;
 479 }
 480
 481 static int mount_fix_timeouts(Mount *m) {
 482         MountParameters *p;
 483         const char *timeout = NULL;
 484         Unit *other;
 485         Iterator i;
 486         usec_t u;
 487         char *t;
 488         int r;
 489
 490         assert(m);
 491
 492         if (!(p = get_mount_parameters_configured(m)))
 493                 return 0;
 494
 495         /* Allow configuration how long we wait for a device that
 496          * backs a mount point to show up. This is useful to support
 497          * endless device timeouts for devices that show up only after
 498          * user input, like crypto devices. */
 499
 500         if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
 501                 timeout += 31;
 502         else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
 503                 timeout += 25;
 504         else
 505                 return 0;
 506
 507         t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
 508         if (!t)
 509                 return -ENOMEM;
 510
 511         r = parse_usec(t, &u);
 512         free(t);
 513
 514         if (r < 0) {
 515                 log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
 516                 return r;
 517         }
 518
 519         SET_FOREACH(other, m->meta.dependencies[UNIT_AFTER], i) {
 520                 if (other->meta.type != UNIT_DEVICE)
 521                         continue;
 522
 523                 other->meta.job_timeout = u;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int mount_verify(Mount *m) {
 530         bool b;
 531         char *e;
 532         assert(m);
 533
 534         if (m->meta.load_state != UNIT_LOADED)
 535                 return 0;
 536
 537         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 538                 return -ENOENT;
 539
 540         if (!(e = unit_name_from_path(m->where, ".mount")))
 541                 return -ENOMEM;
 542
 543         b = unit_has_name(UNIT(m), e);
 544         free(e);
 545
 546         if (!b) {
 547                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 548                 return -EINVAL;
 549         }
 550
 551         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 552                 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
 553                 return -EINVAL;
 554         }
 555
 556         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 557                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 558                 return -EBADMSG;
 559         }
 560
 561         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 562                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 563                 return -EINVAL;
 564         }
 565
 566         return 0;
 567 }
 568
 569 static int mount_load(Unit *u) {
 570         Mount *m = MOUNT(u);
 571         int r;
 572
 573         assert(u);
 574         assert(u->meta.load_state == UNIT_STUB);
 575
 576         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 577                 return r;
 578
 579         /* This is a new unit? Then let's add in some extras */
 580         if (u->meta.load_state == UNIT_LOADED) {
 581                 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
 582                         return r;
 583
 584                 if (m->meta.fragment_path)
 585                         m->from_fragment = true;
 586
 587                 if (!m->where)
 588                         if (!(m->where = unit_name_to_path(u->meta.id)))
 589                                 return -ENOMEM;
 590
 591                 path_kill_slashes(m->where);
 592
 593                 if (!m->meta.description)
 594                         if ((r = unit_set_description(u, m->where)) < 0)
 595                                 return r;
 596
 597                 if ((r = mount_add_device_links(m)) < 0)
 598                         return r;
 599
 600                 if ((r = mount_add_mount_links(m)) < 0)
 601                         return r;
 602
 603                 if ((r = mount_add_socket_links(m)) < 0)
 604                         return r;
 605
 606                 if ((r = mount_add_swap_links(m)) < 0)
 607                         return r;
 608
 609                 if ((r = mount_add_path_links(m)) < 0)
 610                         return r;
 611
 612                 if ((r = mount_add_automount_links(m)) < 0)
 613                         return r;
 614
 615                 if ((r = mount_add_fstab_links(m)) < 0)
 616                         return r;
 617
 618                 if (m->meta.default_dependencies)
 619                         if ((r = mount_add_default_dependencies(m)) < 0)
 620                                 return r;
 621
 622                 if ((r = unit_add_default_cgroups(u)) < 0)
 623                         return r;
 624
 625                 mount_fix_timeouts(m);
 626         }
 627
 628         return mount_verify(m);
 629 }
 630
 631 static int mount_notify_automount(Mount *m, int status) {
 632         Unit *p;
 633         int r;
 634         Iterator i;
 635
 636         assert(m);
 637
 638         SET_FOREACH(p, m->meta.dependencies[UNIT_TRIGGERED_BY], i)
 639                 if (p->meta.type == UNIT_AUTOMOUNT) {
 640                          r = automount_send_ready(AUTOMOUNT(p), status);
 641                          if (r < 0)
 642                                  return r;
 643                 }
 644
 645         return 0;
 646 }
 647
 648 static void mount_set_state(Mount *m, MountState state) {
 649         MountState old_state;
 650         assert(m);
 651
 652         old_state = m->state;
 653         m->state = state;
 654
 655         if (state != MOUNT_MOUNTING &&
 656             state != MOUNT_MOUNTING_DONE &&
 657             state != MOUNT_REMOUNTING &&
 658             state != MOUNT_UNMOUNTING &&
 659             state != MOUNT_MOUNTING_SIGTERM &&
 660             state != MOUNT_MOUNTING_SIGKILL &&
 661             state != MOUNT_UNMOUNTING_SIGTERM &&
 662             state != MOUNT_UNMOUNTING_SIGKILL &&
 663             state != MOUNT_REMOUNTING_SIGTERM &&
 664             state != MOUNT_REMOUNTING_SIGKILL) {
 665                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 666                 mount_unwatch_control_pid(m);
 667                 m->control_command = NULL;
 668                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 669         }
 670
 671         if (state == MOUNT_MOUNTED ||
 672             state == MOUNT_REMOUNTING)
 673                 mount_notify_automount(m, 0);
 674         else if (state == MOUNT_DEAD ||
 675                  state == MOUNT_UNMOUNTING ||
 676                  state == MOUNT_MOUNTING_SIGTERM ||
 677                  state == MOUNT_MOUNTING_SIGKILL ||
 678                  state == MOUNT_REMOUNTING_SIGTERM ||
 679                  state == MOUNT_REMOUNTING_SIGKILL ||
 680                  state == MOUNT_UNMOUNTING_SIGTERM ||
 681                  state == MOUNT_UNMOUNTING_SIGKILL ||
 682                  state == MOUNT_FAILED)
 683                 mount_notify_automount(m, -ENODEV);
 684
 685         if (state != old_state)
 686                 log_debug("%s changed %s -> %s",
 687                           m->meta.id,
 688                           mount_state_to_string(old_state),
 689                           mount_state_to_string(state));
 690
 691         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], !m->reload_failure);
 692         m->reload_failure = false;
 693 }
 694
 695 static int mount_coldplug(Unit *u) {
 696         Mount *m = MOUNT(u);
 697         MountState new_state = MOUNT_DEAD;
 698         int r;
 699
 700         assert(m);
 701         assert(m->state == MOUNT_DEAD);
 702
 703         if (m->deserialized_state != m->state)
 704                 new_state = m->deserialized_state;
 705         else if (m->from_proc_self_mountinfo)
 706                 new_state = MOUNT_MOUNTED;
 707
 708         if (new_state != m->state) {
 709
 710                 if (new_state == MOUNT_MOUNTING ||
 711                     new_state == MOUNT_MOUNTING_DONE ||
 712                     new_state == MOUNT_REMOUNTING ||
 713                     new_state == MOUNT_UNMOUNTING ||
 714                     new_state == MOUNT_MOUNTING_SIGTERM ||
 715                     new_state == MOUNT_MOUNTING_SIGKILL ||
 716                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 717                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 718                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 719                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 720
 721                         if (m->control_pid <= 0)
 722                                 return -EBADMSG;
 723
 724                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 725                                 return r;
 726
 727                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 728                                 return r;
 729                 }
 730
 731                 mount_set_state(m, new_state);
 732         }
 733
 734         return 0;
 735 }
 736
 737 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 738         Mount *m = MOUNT(u);
 739         MountParameters *p;
 740
 741         assert(m);
 742         assert(f);
 743
 744         p = get_mount_parameters(m);
 745
 746         fprintf(f,
 747                 "%sMount State: %s\n"
 748                 "%sWhere: %s\n"
 749                 "%sWhat: %s\n"
 750                 "%sFile System Type: %s\n"
 751                 "%sOptions: %s\n"
 752                 "%sFrom /etc/fstab: %s\n"
 753                 "%sFrom /proc/self/mountinfo: %s\n"
 754                 "%sFrom fragment: %s\n"
 755                 "%sDirectoryMode: %04o\n",
 756                 prefix, mount_state_to_string(m->state),
 757                 prefix, m->where,
 758                 prefix, strna(p->what),
 759                 prefix, strna(p->fstype),
 760                 prefix, strna(p->options),
 761                 prefix, yes_no(m->from_etc_fstab),
 762                 prefix, yes_no(m->from_proc_self_mountinfo),
 763                 prefix, yes_no(m->from_fragment),
 764                 prefix, m->directory_mode);
 765
 766         if (m->control_pid > 0)
 767                 fprintf(f,
 768                         "%sControl PID: %lu\n",
 769                         prefix, (unsigned long) m->control_pid);
 770
 771         exec_context_dump(&m->exec_context, f, prefix);
 772 }
 773
 774 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 775         pid_t pid;
 776         int r;
 777
 778         assert(m);
 779         assert(c);
 780         assert(_pid);
 781
 782         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 783                 goto fail;
 784
 785         if ((r = exec_spawn(c,
 786                             NULL,
 787                             &m->exec_context,
 788                             NULL, 0,
 789                             m->meta.manager->environment,
 790                             true,
 791                             true,
 792                             true,
 793                             m->meta.manager->confirm_spawn,
 794                             m->meta.cgroup_bondings,
 795                             m->meta.cgroup_attributes,
 796                             &pid)) < 0)
 797                 goto fail;
 798
 799         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 800                 /* FIXME: we need to do something here */
 801                 goto fail;
 802
 803         *_pid = pid;
 804
 805         return 0;
 806
 807 fail:
 808         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 809
 810         return r;
 811 }
 812
 813 static void mount_enter_dead(Mount *m, bool success) {
 814         assert(m);
 815
 816         if (!success)
 817                 m->failure = true;
 818
 819         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 820 }
 821
 822 static void mount_enter_mounted(Mount *m, bool success) {
 823         assert(m);
 824
 825         if (!success)
 826                 m->failure = true;
 827
 828         mount_set_state(m, MOUNT_MOUNTED);
 829 }
 830
 831 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 832         int r;
 833         Set *pid_set = NULL;
 834         bool wait_for_exit = false;
 835
 836         assert(m);
 837
 838         if (!success)
 839                 m->failure = true;
 840
 841         if (m->exec_context.kill_mode != KILL_NONE) {
 842                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 843                            state == MOUNT_UNMOUNTING_SIGTERM ||
 844                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 845
 846                 if (m->control_pid > 0) {
 847                         if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
 848
 849                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 850                         else
 851                                 wait_for_exit = true;
 852                 }
 853
 854                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 855
 856                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 857                                 r = -ENOMEM;
 858                                 goto fail;
 859                         }
 860
 861                         /* Exclude the control pid from being killed via the cgroup */
 862                         if (m->control_pid > 0)
 863                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 864                                         goto fail;
 865
 866                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
 867                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 868                                         log_warning("Failed to kill control group: %s", strerror(-r));
 869                         } else if (r > 0)
 870                                 wait_for_exit = true;
 871
 872                         set_free(pid_set);
 873                         pid_set = NULL;
 874                 }
 875         }
 876
 877         if (wait_for_exit) {
 878                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 879                         goto fail;
 880
 881                 mount_set_state(m, state);
 882         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 883                 mount_enter_mounted(m, true);
 884         else
 885                 mount_enter_dead(m, true);
 886
 887         return;
 888
 889 fail:
 890         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 891
 892         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 893                 mount_enter_mounted(m, false);
 894         else
 895                 mount_enter_dead(m, false);
 896
 897         if (pid_set)
 898                 set_free(pid_set);
 899 }
 900
 901 static void mount_enter_unmounting(Mount *m, bool success) {
 902         int r;
 903
 904         assert(m);
 905
 906         if (!success)
 907                 m->failure = true;
 908
 909         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 910         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 911
 912         if ((r = exec_command_set(
 913                              m->control_command,
 914                              "/bin/umount",
 915                              m->where,
 916                              NULL)) < 0)
 917                 goto fail;
 918
 919         mount_unwatch_control_pid(m);
 920
 921         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 922                 goto fail;
 923
 924         mount_set_state(m, MOUNT_UNMOUNTING);
 925
 926         return;
 927
 928 fail:
 929         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 930         mount_enter_mounted(m, false);
 931 }
 932
 933 static void mount_enter_mounting(Mount *m) {
 934         int r;
 935         MountParameters *p;
 936
 937         assert(m);
 938
 939         m->control_command_id = MOUNT_EXEC_MOUNT;
 940         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 941
 942         mkdir_p(m->where, m->directory_mode);
 943
 944         /* Create the source directory for bind-mounts if needed */
 945         p = get_mount_parameters_configured(m);
 946         if (p && mount_is_bind(p))
 947                 mkdir_p(p->what, m->directory_mode);
 948
 949         if (m->from_fragment)
 950                 r = exec_command_set(
 951                                 m->control_command,
 952                                 "/bin/mount",
 953                                 m->parameters_fragment.what,
 954                                 m->where,
 955                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 956                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 957                                 NULL);
 958         else if (m->from_etc_fstab)
 959                 r = exec_command_set(
 960                                 m->control_command,
 961                                 "/bin/mount",
 962                                 m->where,
 963                                 NULL);
 964         else
 965                 r = -ENOENT;
 966
 967         if (r < 0)
 968                 goto fail;
 969
 970         mount_unwatch_control_pid(m);
 971
 972         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 973                 goto fail;
 974
 975         mount_set_state(m, MOUNT_MOUNTING);
 976
 977         return;
 978
 979 fail:
 980         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 981         mount_enter_dead(m, false);
 982 }
 983
 984 static void mount_enter_mounting_done(Mount *m) {
 985         assert(m);
 986
 987         mount_set_state(m, MOUNT_MOUNTING_DONE);
 988 }
 989
 990 static void mount_enter_remounting(Mount *m, bool success) {
 991         int r;
 992
 993         assert(m);
 994
 995         if (!success)
 996                 m->failure = true;
 997
 998         m->control_command_id = MOUNT_EXEC_REMOUNT;
 999         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1000
1001         if (m->from_fragment) {
1002                 char *buf = NULL;
1003                 const char *o;
1004
1005                 if (m->parameters_fragment.options) {
1006                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
1007                                 r = -ENOMEM;
1008                                 goto fail;
1009                         }
1010
1011                         o = buf;
1012                 } else
1013                         o = "remount";
1014
1015                 r = exec_command_set(
1016                                 m->control_command,
1017                                 "/bin/mount",
1018                                 m->parameters_fragment.what,
1019                                 m->where,
1020                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
1021                                 "-o", o,
1022                                 NULL);
1023
1024                 free(buf);
1025         } else if (m->from_etc_fstab)
1026                 r = exec_command_set(
1027                                 m->control_command,
1028                                 "/bin/mount",
1029                                 m->where,
1030                                 "-o", "remount",
1031                                 NULL);
1032         else
1033                 r = -ENOENT;
1034
1035         if (r < 0)
1036                 goto fail;
1037
1038         mount_unwatch_control_pid(m);
1039
1040         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
1041                 goto fail;
1042
1043         mount_set_state(m, MOUNT_REMOUNTING);
1044
1045         return;
1046
1047 fail:
1048         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
1049         m->reload_failure = true;
1050         mount_enter_mounted(m, true);
1051 }
1052
1053 static int mount_start(Unit *u) {
1054         Mount *m = MOUNT(u);
1055
1056         assert(m);
1057
1058         /* We cannot fulfill this request right now, try again later
1059          * please! */
1060         if (m->state == MOUNT_UNMOUNTING ||
1061             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1062             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1063             m->state == MOUNT_MOUNTING_SIGTERM ||
1064             m->state == MOUNT_MOUNTING_SIGKILL)
1065                 return -EAGAIN;
1066
1067         /* Already on it! */
1068         if (m->state == MOUNT_MOUNTING)
1069                 return 0;
1070
1071         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1072
1073         m->failure = false;
1074         mount_enter_mounting(m);
1075         return 0;
1076 }
1077
1078 static int mount_stop(Unit *u) {
1079         Mount *m = MOUNT(u);
1080
1081         assert(m);
1082
1083         /* Already on it */
1084         if (m->state == MOUNT_UNMOUNTING ||
1085             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1086             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1087             m->state == MOUNT_MOUNTING_SIGTERM ||
1088             m->state == MOUNT_MOUNTING_SIGKILL)
1089                 return 0;
1090
1091         assert(m->state == MOUNT_MOUNTING ||
1092                m->state == MOUNT_MOUNTING_DONE ||
1093                m->state == MOUNT_MOUNTED ||
1094                m->state == MOUNT_REMOUNTING ||
1095                m->state == MOUNT_REMOUNTING_SIGTERM ||
1096                m->state == MOUNT_REMOUNTING_SIGKILL);
1097
1098         mount_enter_unmounting(m, true);
1099         return 0;
1100 }
1101
1102 static int mount_reload(Unit *u) {
1103         Mount *m = MOUNT(u);
1104
1105         assert(m);
1106
1107         if (m->state == MOUNT_MOUNTING_DONE)
1108                 return -EAGAIN;
1109
1110         assert(m->state == MOUNT_MOUNTED);
1111
1112         mount_enter_remounting(m, true);
1113         return 0;
1114 }
1115
1116 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1117         Mount *m = MOUNT(u);
1118
1119         assert(m);
1120         assert(f);
1121         assert(fds);
1122
1123         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1124         unit_serialize_item(u, f, "failure", yes_no(m->failure));
1125
1126         if (m->control_pid > 0)
1127                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1128
1129         if (m->control_command_id >= 0)
1130                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1131
1132         return 0;
1133 }
1134
1135 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1136         Mount *m = MOUNT(u);
1137
1138         assert(u);
1139         assert(key);
1140         assert(value);
1141         assert(fds);
1142
1143         if (streq(key, "state")) {
1144                 MountState state;
1145
1146                 if ((state = mount_state_from_string(value)) < 0)
1147                         log_debug("Failed to parse state value %s", value);
1148                 else
1149                         m->deserialized_state = state;
1150         } else if (streq(key, "failure")) {
1151                 int b;
1152
1153                 if ((b = parse_boolean(value)) < 0)
1154                         log_debug("Failed to parse failure value %s", value);
1155                 else
1156                         m->failure = b || m->failure;
1157
1158         } else if (streq(key, "control-pid")) {
1159                 pid_t pid;
1160
1161                 if (parse_pid(value, &pid) < 0)
1162                         log_debug("Failed to parse control-pid value %s", value);
1163                 else
1164                         m->control_pid = pid;
1165         } else if (streq(key, "control-command")) {
1166                 MountExecCommand id;
1167
1168                 if ((id = mount_exec_command_from_string(value)) < 0)
1169                         log_debug("Failed to parse exec-command value %s", value);
1170                 else {
1171                         m->control_command_id = id;
1172                         m->control_command = m->exec_command + id;
1173                 }
1174
1175         } else
1176                 log_debug("Unknown serialization key '%s'", key);
1177
1178         return 0;
1179 }
1180
1181 static UnitActiveState mount_active_state(Unit *u) {
1182         assert(u);
1183
1184         return state_translation_table[MOUNT(u)->state];
1185 }
1186
1187 static const char *mount_sub_state_to_string(Unit *u) {
1188         assert(u);
1189
1190         return mount_state_to_string(MOUNT(u)->state);
1191 }
1192
1193 static bool mount_check_gc(Unit *u) {
1194         Mount *m = MOUNT(u);
1195
1196         assert(m);
1197
1198         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1199 }
1200
1201 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1202         Mount *m = MOUNT(u);
1203         bool success;
1204
1205         assert(m);
1206         assert(pid >= 0);
1207
1208         if (pid != m->control_pid)
1209                 return;
1210
1211         m->control_pid = 0;
1212
1213         success = is_clean_exit(code, status);
1214         m->failure = m->failure || !success;
1215
1216         if (m->control_command) {
1217                 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1218                 m->control_command = NULL;
1219                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1220         }
1221
1222         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1223                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1224
1225         /* Note that mount(8) returning and the kernel sending us a
1226          * mount table change event might happen out-of-order. If an
1227          * operation succeed we assume the kernel will follow soon too
1228          * and already change into the resulting state.  If it fails
1229          * we check if the kernel still knows about the mount. and
1230          * change state accordingly. */
1231
1232         switch (m->state) {
1233
1234         case MOUNT_MOUNTING:
1235         case MOUNT_MOUNTING_DONE:
1236         case MOUNT_MOUNTING_SIGKILL:
1237         case MOUNT_MOUNTING_SIGTERM:
1238
1239                 if (success)
1240                         mount_enter_mounted(m, true);
1241                 else if (m->from_proc_self_mountinfo)
1242                         mount_enter_mounted(m, false);
1243                 else
1244                         mount_enter_dead(m, false);
1245                 break;
1246
1247         case MOUNT_REMOUNTING:
1248         case MOUNT_REMOUNTING_SIGKILL:
1249         case MOUNT_REMOUNTING_SIGTERM:
1250
1251                 m->reload_failure = !success;
1252                 if (m->from_proc_self_mountinfo)
1253                         mount_enter_mounted(m, true);
1254                 else
1255                         mount_enter_dead(m, true);
1256
1257                 break;
1258
1259         case MOUNT_UNMOUNTING:
1260         case MOUNT_UNMOUNTING_SIGKILL:
1261         case MOUNT_UNMOUNTING_SIGTERM:
1262
1263                 if (success)
1264                         mount_enter_dead(m, true);
1265                 else if (m->from_proc_self_mountinfo)
1266                         mount_enter_mounted(m, false);
1267                 else
1268                         mount_enter_dead(m, false);
1269                 break;
1270
1271         default:
1272                 assert_not_reached("Uh, control process died at wrong time.");
1273         }
1274
1275         /* Notify clients about changed exit status */
1276         unit_add_to_dbus_queue(u);
1277 }
1278
1279 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1280         Mount *m = MOUNT(u);
1281
1282         assert(m);
1283         assert(elapsed == 1);
1284         assert(w == &m->timer_watch);
1285
1286         switch (m->state) {
1287
1288         case MOUNT_MOUNTING:
1289         case MOUNT_MOUNTING_DONE:
1290                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1291                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1292                 break;
1293
1294         case MOUNT_REMOUNTING:
1295                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1296                 m->reload_failure = true;
1297                 mount_enter_mounted(m, true);
1298                 break;
1299
1300         case MOUNT_UNMOUNTING:
1301                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1302                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1303                 break;
1304
1305         case MOUNT_MOUNTING_SIGTERM:
1306                 if (m->exec_context.send_sigkill) {
1307                         log_warning("%s mounting timed out. Killing.", u->meta.id);
1308                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1309                 } else {
1310                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1311
1312                         if (m->from_proc_self_mountinfo)
1313                                 mount_enter_mounted(m, false);
1314                         else
1315                                 mount_enter_dead(m, false);
1316                 }
1317                 break;
1318
1319         case MOUNT_REMOUNTING_SIGTERM:
1320                 if (m->exec_context.send_sigkill) {
1321                         log_warning("%s remounting timed out. Killing.", u->meta.id);
1322                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1323                 } else {
1324                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1325
1326                         if (m->from_proc_self_mountinfo)
1327                                 mount_enter_mounted(m, false);
1328                         else
1329                                 mount_enter_dead(m, false);
1330                 }
1331                 break;
1332
1333         case MOUNT_UNMOUNTING_SIGTERM:
1334                 if (m->exec_context.send_sigkill) {
1335                         log_warning("%s unmounting timed out. Killing.", u->meta.id);
1336                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1337                 } else {
1338                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1339
1340                         if (m->from_proc_self_mountinfo)
1341                                 mount_enter_mounted(m, false);
1342                         else
1343                                 mount_enter_dead(m, false);
1344                 }
1345                 break;
1346
1347         case MOUNT_MOUNTING_SIGKILL:
1348         case MOUNT_REMOUNTING_SIGKILL:
1349         case MOUNT_UNMOUNTING_SIGKILL:
1350                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1351
1352                 if (m->from_proc_self_mountinfo)
1353                         mount_enter_mounted(m, false);
1354                 else
1355                         mount_enter_dead(m, false);
1356                 break;
1357
1358         default:
1359                 assert_not_reached("Timeout at wrong time.");
1360         }
1361 }
1362
1363 static int mount_add_one(
1364                 Manager *m,
1365                 const char *what,
1366                 const char *where,
1367                 const char *options,
1368                 const char *fstype,
1369                 int passno,
1370                 bool from_proc_self_mountinfo,
1371                 bool set_flags) {
1372         int r;
1373         Unit *u;
1374         bool delete;
1375         char *e, *w = NULL, *o = NULL, *f = NULL;
1376         MountParameters *p;
1377
1378         assert(m);
1379         assert(what);
1380         assert(where);
1381         assert(options);
1382         assert(fstype);
1383
1384         assert(!set_flags || from_proc_self_mountinfo);
1385
1386         /* Ignore API mount points. They should never be referenced in
1387          * dependencies ever. */
1388         if (mount_point_is_api(where) || mount_point_ignore(where))
1389                 return 0;
1390
1391         if (streq(fstype, "autofs"))
1392                 return 0;
1393
1394         /* probably some kind of swap, ignore */
1395         if (!is_path(where))
1396                 return 0;
1397
1398         e = unit_name_from_path(where, ".mount");
1399         if (!e)
1400                 return -ENOMEM;
1401
1402         u = manager_get_unit(m, e);
1403         if (!u) {
1404                 delete = true;
1405
1406                 u = unit_new(m, sizeof(Mount));
1407                 if (!u) {
1408                         free(e);
1409                         return -ENOMEM;
1410                 }
1411
1412                 r = unit_add_name(u, e);
1413                 free(e);
1414
1415                 if (r < 0)
1416                         goto fail;
1417
1418                 MOUNT(u)->where = strdup(where);
1419                 if (!MOUNT(u)->where) {
1420                         r = -ENOMEM;
1421                         goto fail;
1422                 }
1423
1424                 unit_add_to_load_queue(u);
1425         } else {
1426                 delete = false;
1427                 free(e);
1428         }
1429
1430         if (!(w = strdup(what)) ||
1431             !(o = strdup(options)) ||
1432             !(f = strdup(fstype))) {
1433                 r = -ENOMEM;
1434                 goto fail;
1435         }
1436
1437         if (from_proc_self_mountinfo) {
1438                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1439
1440                 if (set_flags) {
1441                         MOUNT(u)->is_mounted = true;
1442                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1443                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1444                 }
1445
1446                 MOUNT(u)->from_proc_self_mountinfo = true;
1447         } else {
1448                 p = &MOUNT(u)->parameters_etc_fstab;
1449                 MOUNT(u)->from_etc_fstab = true;
1450         }
1451
1452         free(p->what);
1453         p->what = w;
1454
1455         free(p->options);
1456         p->options = o;
1457
1458         free(p->fstype);
1459         p->fstype = f;
1460
1461         p->passno = passno;
1462
1463         unit_add_to_dbus_queue(u);
1464
1465         return 0;
1466
1467 fail:
1468         free(w);
1469         free(o);
1470         free(f);
1471
1472         if (delete && u)
1473                 unit_free(u);
1474
1475         return r;
1476 }
1477
1478 static int mount_find_pri(char *options) {
1479         char *end, *pri;
1480         unsigned long r;
1481
1482         if (!(pri = mount_test_option(options, "pri")))
1483                 return 0;
1484
1485         pri += 4;
1486
1487         errno = 0;
1488         r = strtoul(pri, &end, 10);
1489
1490         if (errno != 0)
1491                 return -errno;
1492
1493         if (end == pri || (*end != ',' && *end != 0))
1494                 return -EINVAL;
1495
1496         return (int) r;
1497 }
1498
1499 static int mount_load_etc_fstab(Manager *m) {
1500         FILE *f;
1501         int r = 0;
1502         struct mntent* me;
1503
1504         assert(m);
1505
1506         errno = 0;
1507         if (!(f = setmntent("/etc/fstab", "r")))
1508                 return -errno;
1509
1510         while ((me = getmntent(f))) {
1511                 char *where, *what;
1512                 int k;
1513
1514                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1515                         r = -ENOMEM;
1516                         goto finish;
1517                 }
1518
1519                 if (!(where = strdup(me->mnt_dir))) {
1520                         free(what);
1521                         r = -ENOMEM;
1522                         goto finish;
1523                 }
1524
1525                 if (what[0] == '/')
1526                         path_kill_slashes(what);
1527
1528                 if (where[0] == '/')
1529                         path_kill_slashes(where);
1530
1531                 if (streq(me->mnt_type, "swap")) {
1532                         int pri;
1533
1534                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1535                                 k = pri;
1536                         else
1537                                 k = swap_add_one(m,
1538                                                  what,
1539                                                  NULL,
1540                                                  pri,
1541                                                  !!mount_test_option(me->mnt_opts, "noauto"),
1542                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1543                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1544                                                  false);
1545                 } else
1546                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1547
1548                 free(what);
1549                 free(where);
1550
1551                 if (r < 0)
1552                         r = k;
1553         }
1554
1555 finish:
1556
1557         endmntent(f);
1558         return r;
1559 }
1560
1561 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1562         int r = 0;
1563         unsigned i;
1564         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1565
1566         assert(m);
1567
1568         rewind(m->proc_self_mountinfo);
1569
1570         for (i = 1;; i++) {
1571                 int k;
1572
1573                 device = path = options = options2 = fstype = d = p = o = NULL;
1574
1575                 if ((k = fscanf(m->proc_self_mountinfo,
1576                                 "%*s "       /* (1) mount id */
1577                                 "%*s "       /* (2) parent id */
1578                                 "%*s "       /* (3) major:minor */
1579                                 "%*s "       /* (4) root */
1580                                 "%ms "       /* (5) mount point */
1581                                 "%ms"        /* (6) mount options */
1582                                 "%*[^-]"     /* (7) optional fields */
1583                                 "- "         /* (8) separator */
1584                                 "%ms "       /* (9) file system type */
1585                                 "%ms"        /* (10) mount source */
1586                                 "%ms"        /* (11) mount options 2 */
1587                                 "%*[^\n]",   /* some rubbish at the end */
1588                                 &path,
1589                                 &options,
1590                                 &fstype,
1591                                 &device,
1592                                 &options2)) != 5) {
1593
1594                         if (k == EOF)
1595                                 break;
1596
1597                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1598                         goto clean_up;
1599                 }
1600
1601                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1602                         r = -ENOMEM;
1603                         goto finish;
1604                 }
1605
1606                 if (!(d = cunescape(device)) ||
1607                     !(p = cunescape(path))) {
1608                         r = -ENOMEM;
1609                         goto finish;
1610                 }
1611
1612                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1613                         r = k;
1614
1615 clean_up:
1616                 free(device);
1617                 free(path);
1618                 free(options);
1619                 free(options2);
1620                 free(fstype);
1621                 free(d);
1622                 free(p);
1623                 free(o);
1624         }
1625
1626 finish:
1627         free(device);
1628         free(path);
1629         free(options);
1630         free(options2);
1631         free(fstype);
1632         free(d);
1633         free(p);
1634         free(o);
1635
1636         return r;
1637 }
1638
1639 static void mount_shutdown(Manager *m) {
1640         assert(m);
1641
1642         if (m->proc_self_mountinfo) {
1643                 fclose(m->proc_self_mountinfo);
1644                 m->proc_self_mountinfo = NULL;
1645         }
1646 }
1647
1648 static int mount_enumerate(Manager *m) {
1649         int r;
1650         struct epoll_event ev;
1651         assert(m);
1652
1653         if (!m->proc_self_mountinfo) {
1654                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1655                         return -errno;
1656
1657                 m->mount_watch.type = WATCH_MOUNT;
1658                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1659
1660                 zero(ev);
1661                 ev.events = EPOLLPRI;
1662                 ev.data.ptr = &m->mount_watch;
1663
1664                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1665                         return -errno;
1666         }
1667
1668         if ((r = mount_load_etc_fstab(m)) < 0)
1669                 goto fail;
1670
1671         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1672                 goto fail;
1673
1674         return 0;
1675
1676 fail:
1677         mount_shutdown(m);
1678         return r;
1679 }
1680
1681 void mount_fd_event(Manager *m, int events) {
1682         Meta *meta;
1683         int r;
1684
1685         assert(m);
1686         assert(events & EPOLLPRI);
1687
1688         /* The manager calls this for every fd event happening on the
1689          * /proc/self/mountinfo file, which informs us about mounting
1690          * table changes */
1691
1692         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1693                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1694
1695                 /* Reset flags, just in case, for later calls */
1696                 LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_MOUNT]) {
1697                         Mount *mount = (Mount*) meta;
1698
1699                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1700                 }
1701
1702                 return;
1703         }
1704
1705         manager_dispatch_load_queue(m);
1706
1707         LIST_FOREACH(units_by_type, meta, m->units_by_type[UNIT_MOUNT]) {
1708                 Mount *mount = (Mount*) meta;
1709
1710                 if (!mount->is_mounted) {
1711                         /* This has just been unmounted. */
1712
1713                         mount->from_proc_self_mountinfo = false;
1714
1715                         switch (mount->state) {
1716
1717                         case MOUNT_MOUNTED:
1718                                 mount_enter_dead(mount, true);
1719                                 break;
1720
1721                         default:
1722                                 mount_set_state(mount, mount->state);
1723                                 break;
1724
1725                         }
1726
1727                 } else if (mount->just_mounted || mount->just_changed) {
1728
1729                         /* New or changed mount entry */
1730
1731                         switch (mount->state) {
1732
1733                         case MOUNT_DEAD:
1734                         case MOUNT_FAILED:
1735                                 mount_enter_mounted(mount, true);
1736                                 break;
1737
1738                         case MOUNT_MOUNTING:
1739                                 mount_enter_mounting_done(mount);
1740                                 break;
1741
1742                         default:
1743                                 /* Nothing really changed, but let's
1744                                  * issue an notification call
1745                                  * nonetheless, in case somebody is
1746                                  * waiting for this. (e.g. file system
1747                                  * ro/rw remounts.) */
1748                                 mount_set_state(mount, mount->state);
1749                                 break;
1750                         }
1751                 }
1752
1753                 /* Reset the flags for later calls */
1754                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1755         }
1756 }
1757
1758 static void mount_reset_failed(Unit *u) {
1759         Mount *m = MOUNT(u);
1760
1761         assert(m);
1762
1763         if (m->state == MOUNT_FAILED)
1764                 mount_set_state(m, MOUNT_DEAD);
1765
1766         m->failure = false;
1767 }
1768
1769 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1770         Mount *m = MOUNT(u);
1771         int r = 0;
1772         Set *pid_set = NULL;
1773
1774         assert(m);
1775
1776         if (who == KILL_MAIN) {
1777                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1778                 return -ESRCH;
1779         }
1780
1781         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1782                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1783                 return -ESRCH;
1784         }
1785
1786         if (who == KILL_CONTROL || who == KILL_ALL)
1787                 if (m->control_pid > 0)
1788                         if (kill(m->control_pid, signo) < 0)
1789                                 r = -errno;
1790
1791         if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
1792                 int q;
1793
1794                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1795                         return -ENOMEM;
1796
1797                 /* Exclude the control pid from being killed via the cgroup */
1798                 if (m->control_pid > 0)
1799                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1800                                 r = q;
1801                                 goto finish;
1802                         }
1803
1804                 if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0)
1805                         if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
1806                                 r = q;
1807         }
1808
1809 finish:
1810         if (pid_set)
1811                 set_free(pid_set);
1812
1813         return r;
1814 }
1815
1816 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1817         [MOUNT_DEAD] = "dead",
1818         [MOUNT_MOUNTING] = "mounting",
1819         [MOUNT_MOUNTING_DONE] = "mounting-done",
1820         [MOUNT_MOUNTED] = "mounted",
1821         [MOUNT_REMOUNTING] = "remounting",
1822         [MOUNT_UNMOUNTING] = "unmounting",
1823         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1824         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1825         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1826         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1827         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1828         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1829         [MOUNT_FAILED] = "failed"
1830 };
1831
1832 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1833
1834 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1835         [MOUNT_EXEC_MOUNT] = "ExecMount",
1836         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1837         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1838 };
1839
1840 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1841
1842 const UnitVTable mount_vtable = {
1843         .suffix = ".mount",
1844         .object_size = sizeof(Mount),
1845         .sections =
1846                 "Unit\0"
1847                 "Mount\0"
1848                 "Install\0",
1849
1850         .no_alias = true,
1851         .no_instances = true,
1852         .show_status = true,
1853
1854         .init = mount_init,
1855         .load = mount_load,
1856         .done = mount_done,
1857
1858         .coldplug = mount_coldplug,
1859
1860         .dump = mount_dump,
1861
1862         .start = mount_start,
1863         .stop = mount_stop,
1864         .reload = mount_reload,
1865
1866         .kill = mount_kill,
1867
1868         .serialize = mount_serialize,
1869         .deserialize_item = mount_deserialize_item,
1870
1871         .active_state = mount_active_state,
1872         .sub_state_to_string = mount_sub_state_to_string,
1873
1874         .check_gc = mount_check_gc,
1875
1876         .sigchld_event = mount_sigchld_event,
1877         .timer_event = mount_timer_event,
1878
1879         .reset_failed = mount_reset_failed,
1880
1881         .bus_interface = "org.freedesktop.systemd1.Mount",
1882         .bus_message_handler = bus_mount_message_handler,
1883         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1884
1885         .enumerate = mount_enumerate,
1886         .shutdown = mount_shutdown
1887 };