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