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 "mkdir.h"
  35 #include "mount-setup.h"
  36 #include "unit-name.h"
  37 #include "dbus-mount.h"
  38 #include "special.h"
  39 #include "bus-errors.h"
  40 #include "exit-status.h"
  41 #include "def.h"
  42
  43 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  44         [MOUNT_DEAD] = UNIT_INACTIVE,
  45         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  46         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  47         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  48         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  49         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  50         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  51         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  52         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  53         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  54         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  55         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  56         [MOUNT_FAILED] = UNIT_FAILED
  57 };
  58
  59 static void mount_init(Unit *u) {
  60         Mount *m = MOUNT(u);
  61
  62         assert(u);
  63         assert(u->load_state == UNIT_STUB);
  64
  65         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  66         m->directory_mode = 0755;
  67
  68         exec_context_init(&m->exec_context);
  69
  70         /* The stdio/kmsg bridge socket is on /, in order to avoid a
  71          * dep loop, don't use kmsg logging for -.mount */
  72         if (!unit_has_name(u, "-.mount")) {
  73                 m->exec_context.std_output = u->manager->default_std_output;
  74                 m->exec_context.std_error = u->manager->default_std_error;
  75         }
  76
  77         /* We need to make sure that /bin/mount is always called in
  78          * the same process group as us, so that the autofs kernel
  79          * side doesn't send us another mount request while we are
  80          * already trying to comply its last one. */
  81         m->exec_context.same_pgrp = true;
  82
  83         m->timer_watch.type = WATCH_INVALID;
  84
  85         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  86
  87         UNIT(m)->ignore_on_isolate = true;
  88 }
  89
  90 static void mount_unwatch_control_pid(Mount *m) {
  91         assert(m);
  92
  93         if (m->control_pid <= 0)
  94                 return;
  95
  96         unit_unwatch_pid(UNIT(m), m->control_pid);
  97         m->control_pid = 0;
  98 }
  99
 100 static void mount_parameters_done(MountParameters *p) {
 101         assert(p);
 102
 103         free(p->what);
 104         free(p->options);
 105         free(p->fstype);
 106
 107         p->what = p->options = p->fstype = NULL;
 108 }
 109
 110 static void mount_done(Unit *u) {
 111         Mount *m = MOUNT(u);
 112
 113         assert(m);
 114
 115         free(m->where);
 116         m->where = NULL;
 117
 118         mount_parameters_done(&m->parameters_etc_fstab);
 119         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 120         mount_parameters_done(&m->parameters_fragment);
 121
 122         exec_context_done(&m->exec_context);
 123         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 124         m->control_command = NULL;
 125
 126         mount_unwatch_control_pid(m);
 127
 128         unit_unwatch_timer(u, &m->timer_watch);
 129 }
 130
 131 static MountParameters* get_mount_parameters_configured(Mount *m) {
 132         assert(m);
 133
 134         if (m->from_fragment)
 135                 return &m->parameters_fragment;
 136         else if (m->from_etc_fstab)
 137                 return &m->parameters_etc_fstab;
 138
 139         return NULL;
 140 }
 141
 142 static MountParameters* get_mount_parameters(Mount *m) {
 143         assert(m);
 144
 145         if (m->from_proc_self_mountinfo)
 146                 return &m->parameters_proc_self_mountinfo;
 147
 148         return get_mount_parameters_configured(m);
 149 }
 150
 151 static int mount_add_mount_links(Mount *m) {
 152         Unit *other;
 153         int r;
 154         MountParameters *pm;
 155
 156         assert(m);
 157
 158         pm = get_mount_parameters_configured(m);
 159
 160         /* Adds in links to other mount points that might lie below or
 161          * above us in the hierarchy */
 162
 163         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_MOUNT]) {
 164                 Mount *n = MOUNT(other);
 165                 MountParameters *pn;
 166
 167                 if (n == m)
 168                         continue;
 169
 170                 if (UNIT(n)->load_state != UNIT_LOADED)
 171                         continue;
 172
 173                 pn = get_mount_parameters_configured(n);
 174
 175                 if (path_startswith(m->where, n->where)) {
 176
 177                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 178                                 return r;
 179
 180                         if (pn)
 181                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 182                                         return r;
 183
 184                 } else if (path_startswith(n->where, m->where)) {
 185
 186                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 187                                 return r;
 188
 189                         if (pm)
 190                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 191                                         return r;
 192
 193                 } else if (pm && pm->what && path_startswith(pm->what, n->where)) {
 194
 195                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 196                                 return r;
 197
 198                         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 199                                 return r;
 200
 201                 } else if (pn && pn->what && path_startswith(pn->what, m->where)) {
 202
 203                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 204                                 return r;
 205
 206                         if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 207                                 return r;
 208                 }
 209         }
 210
 211         return 0;
 212 }
 213
 214 static int mount_add_swap_links(Mount *m) {
 215         Unit *other;
 216         int r;
 217
 218         assert(m);
 219
 220         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_SWAP])
 221                 if ((r = swap_add_one_mount_link(SWAP(other), m)) < 0)
 222                         return r;
 223
 224         return 0;
 225 }
 226
 227 static int mount_add_path_links(Mount *m) {
 228         Unit *other;
 229         int r;
 230
 231         assert(m);
 232
 233         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_PATH])
 234                 if ((r = path_add_one_mount_link(PATH(other), m)) < 0)
 235                         return r;
 236
 237         return 0;
 238 }
 239
 240 static int mount_add_automount_links(Mount *m) {
 241         Unit *other;
 242         int r;
 243
 244         assert(m);
 245
 246         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_AUTOMOUNT])
 247                 if ((r = automount_add_one_mount_link(AUTOMOUNT(other), m)) < 0)
 248                         return r;
 249
 250         return 0;
 251 }
 252
 253 static int mount_add_socket_links(Mount *m) {
 254         Unit *other;
 255         int r;
 256
 257         assert(m);
 258
 259         LIST_FOREACH(units_by_type, other, UNIT(m)->manager->units_by_type[UNIT_SOCKET])
 260                 if ((r = socket_add_one_mount_link(SOCKET(other), m)) < 0)
 261                         return r;
 262
 263         return 0;
 264 }
 265
 266 static char* mount_test_option(const char *haystack, const char *needle) {
 267         struct mntent me;
 268
 269         assert(needle);
 270
 271         /* Like glibc's hasmntopt(), but works on a string, not a
 272          * struct mntent */
 273
 274         if (!haystack)
 275                 return NULL;
 276
 277         zero(me);
 278         me.mnt_opts = (char*) haystack;
 279
 280         return hasmntopt(&me, needle);
 281 }
 282
 283 static bool mount_is_network(MountParameters *p) {
 284         assert(p);
 285
 286         if (mount_test_option(p->options, "_netdev"))
 287                 return true;
 288
 289         if (p->fstype && fstype_is_network(p->fstype))
 290                 return true;
 291
 292         return false;
 293 }
 294
 295 static bool mount_is_bind(MountParameters *p) {
 296         assert(p);
 297
 298         if (mount_test_option(p->options, "bind"))
 299                 return true;
 300
 301         if (p->fstype && streq(p->fstype, "bind"))
 302                 return true;
 303
 304         return false;
 305 }
 306
 307 static bool needs_quota(MountParameters *p) {
 308         assert(p);
 309
 310         if (mount_is_network(p))
 311                 return false;
 312
 313         if (mount_is_bind(p))
 314                 return false;
 315
 316         return mount_test_option(p->options, "usrquota") ||
 317                 mount_test_option(p->options, "grpquota") ||
 318                 mount_test_option(p->options, "quota") ||
 319                 mount_test_option(p->options, "usrjquota") ||
 320                 mount_test_option(p->options, "grpjquota");
 321 }
 322
 323 static int mount_add_fstab_links(Mount *m) {
 324         const char *target, *after, *tu_wants = NULL;
 325         MountParameters *p;
 326         Unit *tu;
 327         int r;
 328         bool noauto, nofail, handle, automount;
 329
 330         assert(m);
 331
 332         if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
 333                 return 0;
 334
 335         if (!(p = get_mount_parameters_configured(m)))
 336                 return 0;
 337
 338         if (p != &m->parameters_etc_fstab)
 339                 return 0;
 340
 341         noauto = !!mount_test_option(p->options, "noauto");
 342         nofail = !!mount_test_option(p->options, "nofail");
 343         automount =
 344                 mount_test_option(p->options, "comment=systemd.automount") ||
 345                 mount_test_option(p->options, "x-systemd-automount");
 346         handle =
 347                 automount ||
 348                 mount_test_option(p->options, "comment=systemd.mount") ||
 349                 mount_test_option(p->options, "x-systemd-mount") ||
 350                 UNIT(m)->manager->mount_auto;
 351
 352         if (mount_is_network(p)) {
 353                 target = SPECIAL_REMOTE_FS_TARGET;
 354                 after = tu_wants = SPECIAL_REMOTE_FS_PRE_TARGET;
 355         } else {
 356                 target = SPECIAL_LOCAL_FS_TARGET;
 357                 after = SPECIAL_LOCAL_FS_PRE_TARGET;
 358         }
 359
 360         r = manager_load_unit(UNIT(m)->manager, target, NULL, NULL, &tu);
 361         if (r < 0)
 362                 return r;
 363
 364         if (tu_wants) {
 365                 r = unit_add_dependency_by_name(tu, UNIT_WANTS, tu_wants, NULL, true);
 366                 if (r < 0)
 367                         return r;
 368         }
 369
 370         if (after) {
 371                 r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true);
 372                 if (r < 0)
 373                         return r;
 374         }
 375
 376         if (automount) {
 377                 Unit *am;
 378
 379                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 380                         return r;
 381
 382                 /* If auto is configured as well also pull in the
 383                  * mount right-away, but don't rely on it. */
 384                 if (!noauto) /* automount + auto */
 385                         if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 386                                 return r;
 387
 388                 /* Install automount unit */
 389                 if (!nofail) /* automount + fail */
 390                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, am, true);
 391                 else /* automount + nofail */
 392                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, am, true);
 393
 394         } else if (handle && !noauto) {
 395
 396                 /* Automatically add mount points that aren't natively
 397                  * configured to local-fs.target */
 398
 399                 if (!nofail) /* auto + fail */
 400                         return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_REQUIRES, UNIT(m), true);
 401                 else /* auto + nofail */
 402                         return unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true);
 403         }
 404
 405         return 0;
 406 }
 407
 408 static int mount_add_device_links(Mount *m) {
 409         MountParameters *p;
 410         int r;
 411
 412         assert(m);
 413
 414         if (!(p = get_mount_parameters_configured(m)))
 415                 return 0;
 416
 417         if (!p->what)
 418                 return 0;
 419
 420         if (!mount_is_bind(p) &&
 421             !path_equal(m->where, "/") &&
 422             p == &m->parameters_etc_fstab) {
 423                 bool nofail, noauto;
 424
 425                 noauto = !!mount_test_option(p->options, "noauto");
 426                 nofail = !!mount_test_option(p->options, "nofail");
 427
 428                 if ((r = unit_add_node_link(UNIT(m), p->what,
 429                                             !noauto && nofail &&
 430                                             UNIT(m)->manager->running_as == MANAGER_SYSTEM)) < 0)
 431                         return r;
 432         }
 433
 434         if (p->passno > 0 &&
 435             !mount_is_bind(p) &&
 436             UNIT(m)->manager->running_as == MANAGER_SYSTEM &&
 437             !path_equal(m->where, "/")) {
 438                 char *name;
 439                 Unit *fsck;
 440                 /* Let's add in the fsck service */
 441
 442                 /* aka SPECIAL_FSCK_SERVICE */
 443                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 444                         return -ENOMEM;
 445
 446                 if ((r = manager_load_unit_prepare(UNIT(m)->manager, name, NULL, NULL, &fsck)) < 0) {
 447                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 448                         free(name);
 449                         return r;
 450                 }
 451
 452                 free(name);
 453
 454                 SERVICE(fsck)->fsck_passno = p->passno;
 455
 456                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 457                         return r;
 458         }
 459
 460         return 0;
 461 }
 462
 463 static int mount_add_default_dependencies(Mount *m) {
 464         int r;
 465         MountParameters *p;
 466
 467         assert(m);
 468
 469         if (UNIT(m)->manager->running_as != MANAGER_SYSTEM)
 470                 return 0;
 471
 472         p = get_mount_parameters_configured(m);
 473         if (p && needs_quota(p)) {
 474                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
 475                     (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
 476                         return r;
 477         }
 478
 479         if (!path_equal(m->where, "/"))
 480                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 481                         return r;
 482
 483         return 0;
 484 }
 485
 486 static int mount_fix_timeouts(Mount *m) {
 487         MountParameters *p;
 488         const char *timeout = NULL;
 489         Unit *other;
 490         Iterator i;
 491         usec_t u;
 492         char *t;
 493         int r;
 494
 495         assert(m);
 496
 497         if (!(p = get_mount_parameters_configured(m)))
 498                 return 0;
 499
 500         /* Allow configuration how long we wait for a device that
 501          * backs a mount point to show up. This is useful to support
 502          * endless device timeouts for devices that show up only after
 503          * user input, like crypto devices. */
 504
 505         if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
 506                 timeout += 31;
 507         else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
 508                 timeout += 25;
 509         else
 510                 return 0;
 511
 512         t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
 513         if (!t)
 514                 return -ENOMEM;
 515
 516         r = parse_usec(t, &u);
 517         free(t);
 518
 519         if (r < 0) {
 520                 log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
 521                 return r;
 522         }
 523
 524         SET_FOREACH(other, UNIT(m)->dependencies[UNIT_AFTER], i) {
 525                 if (other->type != UNIT_DEVICE)
 526                         continue;
 527
 528                 other->job_timeout = u;
 529         }
 530
 531         return 0;
 532 }
 533
 534 static int mount_verify(Mount *m) {
 535         bool b;
 536         char *e;
 537         assert(m);
 538
 539         if (UNIT(m)->load_state != UNIT_LOADED)
 540                 return 0;
 541
 542         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 543                 return -ENOENT;
 544
 545         if (!(e = unit_name_from_path(m->where, ".mount")))
 546                 return -ENOMEM;
 547
 548         b = unit_has_name(UNIT(m), e);
 549         free(e);
 550
 551         if (!b) {
 552                 log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(m)->id);
 553                 return -EINVAL;
 554         }
 555
 556         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 557                 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
 558                 return -EINVAL;
 559         }
 560
 561         if (UNIT(m)->fragment_path && !m->parameters_fragment.what) {
 562                 log_error("%s's What setting is missing. Refusing.", UNIT(m)->id);
 563                 return -EBADMSG;
 564         }
 565
 566         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 567                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", UNIT(m)->id);
 568                 return -EINVAL;
 569         }
 570
 571         return 0;
 572 }
 573
 574 static int mount_load(Unit *u) {
 575         Mount *m = MOUNT(u);
 576         int r;
 577
 578         assert(u);
 579         assert(u->load_state == UNIT_STUB);
 580
 581         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 582                 return r;
 583
 584         /* This is a new unit? Then let's add in some extras */
 585         if (u->load_state == UNIT_LOADED) {
 586                 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
 587                         return r;
 588
 589                 if (UNIT(m)->fragment_path)
 590                         m->from_fragment = true;
 591                 else if (m->from_etc_fstab)
 592                         /* We always add several default dependencies to fstab mounts,
 593                          * but we do not want the implicit complementing of Wants= with After=
 594                          * in the target unit that this mount unit will be hooked into. */
 595                         UNIT(m)->default_dependencies = false;
 596
 597                 if (!m->where)
 598                         if (!(m->where = unit_name_to_path(u->id)))
 599                                 return -ENOMEM;
 600
 601                 path_kill_slashes(m->where);
 602
 603                 if (!UNIT(m)->description)
 604                         if ((r = unit_set_description(u, m->where)) < 0)
 605                                 return r;
 606
 607                 if ((r = mount_add_device_links(m)) < 0)
 608                         return r;
 609
 610                 if ((r = mount_add_mount_links(m)) < 0)
 611                         return r;
 612
 613                 if ((r = mount_add_socket_links(m)) < 0)
 614                         return r;
 615
 616                 if ((r = mount_add_swap_links(m)) < 0)
 617                         return r;
 618
 619                 if ((r = mount_add_path_links(m)) < 0)
 620                         return r;
 621
 622                 if ((r = mount_add_automount_links(m)) < 0)
 623                         return r;
 624
 625                 if ((r = mount_add_fstab_links(m)) < 0)
 626                         return r;
 627
 628                 if (UNIT(m)->default_dependencies || m->from_etc_fstab)
 629                         if ((r = mount_add_default_dependencies(m)) < 0)
 630                                 return r;
 631
 632                 if ((r = unit_add_default_cgroups(u)) < 0)
 633                         return r;
 634
 635                 mount_fix_timeouts(m);
 636         }
 637
 638         return mount_verify(m);
 639 }
 640
 641 static int mount_notify_automount(Mount *m, int status) {
 642         Unit *p;
 643         int r;
 644         Iterator i;
 645
 646         assert(m);
 647
 648         SET_FOREACH(p, UNIT(m)->dependencies[UNIT_TRIGGERED_BY], i)
 649                 if (p->type == UNIT_AUTOMOUNT) {
 650                          r = automount_send_ready(AUTOMOUNT(p), status);
 651                          if (r < 0)
 652                                  return r;
 653                 }
 654
 655         return 0;
 656 }
 657
 658 static void mount_set_state(Mount *m, MountState state) {
 659         MountState old_state;
 660         assert(m);
 661
 662         old_state = m->state;
 663         m->state = state;
 664
 665         if (state != MOUNT_MOUNTING &&
 666             state != MOUNT_MOUNTING_DONE &&
 667             state != MOUNT_REMOUNTING &&
 668             state != MOUNT_UNMOUNTING &&
 669             state != MOUNT_MOUNTING_SIGTERM &&
 670             state != MOUNT_MOUNTING_SIGKILL &&
 671             state != MOUNT_UNMOUNTING_SIGTERM &&
 672             state != MOUNT_UNMOUNTING_SIGKILL &&
 673             state != MOUNT_REMOUNTING_SIGTERM &&
 674             state != MOUNT_REMOUNTING_SIGKILL) {
 675                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 676                 mount_unwatch_control_pid(m);
 677                 m->control_command = NULL;
 678                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 679         }
 680
 681         if (state == MOUNT_MOUNTED ||
 682             state == MOUNT_REMOUNTING)
 683                 mount_notify_automount(m, 0);
 684         else if (state == MOUNT_DEAD ||
 685                  state == MOUNT_UNMOUNTING ||
 686                  state == MOUNT_MOUNTING_SIGTERM ||
 687                  state == MOUNT_MOUNTING_SIGKILL ||
 688                  state == MOUNT_REMOUNTING_SIGTERM ||
 689                  state == MOUNT_REMOUNTING_SIGKILL ||
 690                  state == MOUNT_UNMOUNTING_SIGTERM ||
 691                  state == MOUNT_UNMOUNTING_SIGKILL ||
 692                  state == MOUNT_FAILED)
 693                 mount_notify_automount(m, -ENODEV);
 694
 695         if (state != old_state)
 696                 log_debug("%s changed %s -> %s",
 697                           UNIT(m)->id,
 698                           mount_state_to_string(old_state),
 699                           mount_state_to_string(state));
 700
 701         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], m->reload_result == MOUNT_SUCCESS);
 702         m->reload_result = MOUNT_SUCCESS;
 703 }
 704
 705 static int mount_coldplug(Unit *u) {
 706         Mount *m = MOUNT(u);
 707         MountState new_state = MOUNT_DEAD;
 708         int r;
 709
 710         assert(m);
 711         assert(m->state == MOUNT_DEAD);
 712
 713         if (m->deserialized_state != m->state)
 714                 new_state = m->deserialized_state;
 715         else if (m->from_proc_self_mountinfo)
 716                 new_state = MOUNT_MOUNTED;
 717
 718         if (new_state != m->state) {
 719
 720                 if (new_state == MOUNT_MOUNTING ||
 721                     new_state == MOUNT_MOUNTING_DONE ||
 722                     new_state == MOUNT_REMOUNTING ||
 723                     new_state == MOUNT_UNMOUNTING ||
 724                     new_state == MOUNT_MOUNTING_SIGTERM ||
 725                     new_state == MOUNT_MOUNTING_SIGKILL ||
 726                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 727                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 728                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 729                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 730
 731                         if (m->control_pid <= 0)
 732                                 return -EBADMSG;
 733
 734                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 735                                 return r;
 736
 737                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 738                                 return r;
 739                 }
 740
 741                 mount_set_state(m, new_state);
 742         }
 743
 744         return 0;
 745 }
 746
 747 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 748         Mount *m = MOUNT(u);
 749         MountParameters *p;
 750
 751         assert(m);
 752         assert(f);
 753
 754         p = get_mount_parameters(m);
 755
 756         fprintf(f,
 757                 "%sMount State: %s\n"
 758                 "%sResult: %s\n"
 759                 "%sWhere: %s\n"
 760                 "%sWhat: %s\n"
 761                 "%sFile System Type: %s\n"
 762                 "%sOptions: %s\n"
 763                 "%sFrom /etc/fstab: %s\n"
 764                 "%sFrom /proc/self/mountinfo: %s\n"
 765                 "%sFrom fragment: %s\n"
 766                 "%sDirectoryMode: %04o\n",
 767                 prefix, mount_state_to_string(m->state),
 768                 prefix, mount_result_to_string(m->result),
 769                 prefix, m->where,
 770                 prefix, strna(p->what),
 771                 prefix, strna(p->fstype),
 772                 prefix, strna(p->options),
 773                 prefix, yes_no(m->from_etc_fstab),
 774                 prefix, yes_no(m->from_proc_self_mountinfo),
 775                 prefix, yes_no(m->from_fragment),
 776                 prefix, m->directory_mode);
 777
 778         if (m->control_pid > 0)
 779                 fprintf(f,
 780                         "%sControl PID: %lu\n",
 781                         prefix, (unsigned long) m->control_pid);
 782
 783         exec_context_dump(&m->exec_context, f, prefix);
 784 }
 785
 786 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 787         pid_t pid;
 788         int r;
 789
 790         assert(m);
 791         assert(c);
 792         assert(_pid);
 793
 794         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 795                 goto fail;
 796
 797         if ((r = exec_spawn(c,
 798                             NULL,
 799                             &m->exec_context,
 800                             NULL, 0,
 801                             UNIT(m)->manager->environment,
 802                             true,
 803                             true,
 804                             true,
 805                             UNIT(m)->manager->confirm_spawn,
 806                             UNIT(m)->cgroup_bondings,
 807                             UNIT(m)->cgroup_attributes,
 808                             &pid)) < 0)
 809                 goto fail;
 810
 811         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 812                 /* FIXME: we need to do something here */
 813                 goto fail;
 814
 815         *_pid = pid;
 816
 817         return 0;
 818
 819 fail:
 820         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 821
 822         return r;
 823 }
 824
 825 static void mount_enter_dead(Mount *m, MountResult f) {
 826         assert(m);
 827
 828         if (f != MOUNT_SUCCESS)
 829                 m->result = f;
 830
 831         mount_set_state(m, m->result != MOUNT_SUCCESS ? MOUNT_FAILED : MOUNT_DEAD);
 832 }
 833
 834 static void mount_enter_mounted(Mount *m, MountResult f) {
 835         assert(m);
 836
 837         if (f != MOUNT_SUCCESS)
 838                 m->result = f;
 839
 840         mount_set_state(m, MOUNT_MOUNTED);
 841 }
 842
 843 static void mount_enter_signal(Mount *m, MountState state, MountResult f) {
 844         int r;
 845         Set *pid_set = NULL;
 846         bool wait_for_exit = false;
 847
 848         assert(m);
 849
 850         if (f != MOUNT_SUCCESS)
 851                 m->result = f;
 852
 853         if (m->exec_context.kill_mode != KILL_NONE) {
 854                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 855                            state == MOUNT_UNMOUNTING_SIGTERM ||
 856                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 857
 858                 if (m->control_pid > 0) {
 859                         if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
 860
 861                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 862                         else
 863                                 wait_for_exit = true;
 864                 }
 865
 866                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 867
 868                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 869                                 r = -ENOMEM;
 870                                 goto fail;
 871                         }
 872
 873                         /* Exclude the control pid from being killed via the cgroup */
 874                         if (m->control_pid > 0)
 875                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 876                                         goto fail;
 877
 878                         if ((r = cgroup_bonding_kill_list(UNIT(m)->cgroup_bondings, sig, true, pid_set)) < 0) {
 879                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 880                                         log_warning("Failed to kill control group: %s", strerror(-r));
 881                         } else if (r > 0)
 882                                 wait_for_exit = true;
 883
 884                         set_free(pid_set);
 885                         pid_set = NULL;
 886                 }
 887         }
 888
 889         if (wait_for_exit) {
 890                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 891                         goto fail;
 892
 893                 mount_set_state(m, state);
 894         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 895                 mount_enter_mounted(m, MOUNT_SUCCESS);
 896         else
 897                 mount_enter_dead(m, MOUNT_SUCCESS);
 898
 899         return;
 900
 901 fail:
 902         log_warning("%s failed to kill processes: %s", UNIT(m)->id, strerror(-r));
 903
 904         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 905                 mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
 906         else
 907                 mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
 908
 909         if (pid_set)
 910                 set_free(pid_set);
 911 }
 912
 913 static void mount_enter_unmounting(Mount *m) {
 914         int r;
 915
 916         assert(m);
 917
 918         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 919         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 920
 921         if ((r = exec_command_set(
 922                              m->control_command,
 923                              "/bin/umount",
 924                              m->where,
 925                              NULL)) < 0)
 926                 goto fail;
 927
 928         mount_unwatch_control_pid(m);
 929
 930         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 931                 goto fail;
 932
 933         mount_set_state(m, MOUNT_UNMOUNTING);
 934
 935         return;
 936
 937 fail:
 938         log_warning("%s failed to run 'umount' task: %s", UNIT(m)->id, strerror(-r));
 939         mount_enter_mounted(m, MOUNT_FAILURE_RESOURCES);
 940 }
 941
 942 static void mount_enter_mounting(Mount *m) {
 943         int r;
 944         MountParameters *p;
 945
 946         assert(m);
 947
 948         m->control_command_id = MOUNT_EXEC_MOUNT;
 949         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 950
 951         mkdir_p(m->where, m->directory_mode);
 952
 953         /* Create the source directory for bind-mounts if needed */
 954         p = get_mount_parameters_configured(m);
 955         if (p && mount_is_bind(p))
 956                 mkdir_p(p->what, m->directory_mode);
 957
 958         if (m->from_fragment)
 959                 r = exec_command_set(
 960                                 m->control_command,
 961                                 "/bin/mount",
 962                                 m->parameters_fragment.what,
 963                                 m->where,
 964                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 965                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 966                                 NULL);
 967         else if (m->from_etc_fstab)
 968                 r = exec_command_set(
 969                                 m->control_command,
 970                                 "/bin/mount",
 971                                 m->where,
 972                                 NULL);
 973         else
 974                 r = -ENOENT;
 975
 976         if (r < 0)
 977                 goto fail;
 978
 979         mount_unwatch_control_pid(m);
 980
 981         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 982                 goto fail;
 983
 984         mount_set_state(m, MOUNT_MOUNTING);
 985
 986         return;
 987
 988 fail:
 989         log_warning("%s failed to run 'mount' task: %s", UNIT(m)->id, strerror(-r));
 990         mount_enter_dead(m, MOUNT_FAILURE_RESOURCES);
 991 }
 992
 993 static void mount_enter_mounting_done(Mount *m) {
 994         assert(m);
 995
 996         mount_set_state(m, MOUNT_MOUNTING_DONE);
 997 }
 998
 999 static void mount_enter_remounting(Mount *m) {
1000         int r;
1001
1002         assert(m);
1003
1004         m->control_command_id = MOUNT_EXEC_REMOUNT;
1005         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
1006
1007         if (m->from_fragment) {
1008                 char *buf = NULL;
1009                 const char *o;
1010
1011                 if (m->parameters_fragment.options) {
1012                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
1013                                 r = -ENOMEM;
1014                                 goto fail;
1015                         }
1016
1017                         o = buf;
1018                 } else
1019                         o = "remount";
1020
1021                 r = exec_command_set(
1022                                 m->control_command,
1023                                 "/bin/mount",
1024                                 m->parameters_fragment.what,
1025                                 m->where,
1026                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
1027                                 "-o", o,
1028                                 NULL);
1029
1030                 free(buf);
1031         } else if (m->from_etc_fstab)
1032                 r = exec_command_set(
1033                                 m->control_command,
1034                                 "/bin/mount",
1035                                 m->where,
1036                                 "-o", "remount",
1037                                 NULL);
1038         else
1039                 r = -ENOENT;
1040
1041         if (r < 0)
1042                 goto fail;
1043
1044         mount_unwatch_control_pid(m);
1045
1046         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
1047                 goto fail;
1048
1049         mount_set_state(m, MOUNT_REMOUNTING);
1050
1051         return;
1052
1053 fail:
1054         log_warning("%s failed to run 'remount' task: %s", UNIT(m)->id, strerror(-r));
1055         m->reload_result = MOUNT_FAILURE_RESOURCES;
1056         mount_enter_mounted(m, MOUNT_SUCCESS);
1057 }
1058
1059 static int mount_start(Unit *u) {
1060         Mount *m = MOUNT(u);
1061
1062         assert(m);
1063
1064         /* We cannot fulfill this request right now, try again later
1065          * please! */
1066         if (m->state == MOUNT_UNMOUNTING ||
1067             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1068             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1069             m->state == MOUNT_MOUNTING_SIGTERM ||
1070             m->state == MOUNT_MOUNTING_SIGKILL)
1071                 return -EAGAIN;
1072
1073         /* Already on it! */
1074         if (m->state == MOUNT_MOUNTING)
1075                 return 0;
1076
1077         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1078
1079         m->result = MOUNT_SUCCESS;
1080         m->reload_result = MOUNT_SUCCESS;
1081
1082         mount_enter_mounting(m);
1083         return 0;
1084 }
1085
1086 static int mount_stop(Unit *u) {
1087         Mount *m = MOUNT(u);
1088
1089         assert(m);
1090
1091         /* Already on it */
1092         if (m->state == MOUNT_UNMOUNTING ||
1093             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1094             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1095             m->state == MOUNT_MOUNTING_SIGTERM ||
1096             m->state == MOUNT_MOUNTING_SIGKILL)
1097                 return 0;
1098
1099         assert(m->state == MOUNT_MOUNTING ||
1100                m->state == MOUNT_MOUNTING_DONE ||
1101                m->state == MOUNT_MOUNTED ||
1102                m->state == MOUNT_REMOUNTING ||
1103                m->state == MOUNT_REMOUNTING_SIGTERM ||
1104                m->state == MOUNT_REMOUNTING_SIGKILL);
1105
1106         mount_enter_unmounting(m);
1107         return 0;
1108 }
1109
1110 static int mount_reload(Unit *u) {
1111         Mount *m = MOUNT(u);
1112
1113         assert(m);
1114
1115         if (m->state == MOUNT_MOUNTING_DONE)
1116                 return -EAGAIN;
1117
1118         assert(m->state == MOUNT_MOUNTED);
1119
1120         mount_enter_remounting(m);
1121         return 0;
1122 }
1123
1124 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1125         Mount *m = MOUNT(u);
1126
1127         assert(m);
1128         assert(f);
1129         assert(fds);
1130
1131         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1132         unit_serialize_item(u, f, "result", mount_result_to_string(m->result));
1133         unit_serialize_item(u, f, "reload-result", mount_result_to_string(m->reload_result));
1134
1135         if (m->control_pid > 0)
1136                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1137
1138         if (m->control_command_id >= 0)
1139                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1140
1141         return 0;
1142 }
1143
1144 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1145         Mount *m = MOUNT(u);
1146
1147         assert(u);
1148         assert(key);
1149         assert(value);
1150         assert(fds);
1151
1152         if (streq(key, "state")) {
1153                 MountState state;
1154
1155                 if ((state = mount_state_from_string(value)) < 0)
1156                         log_debug("Failed to parse state value %s", value);
1157                 else
1158                         m->deserialized_state = state;
1159         } else if (streq(key, "result")) {
1160                 MountResult f;
1161
1162                 f = mount_result_from_string(value);
1163                 if (f < 0)
1164                         log_debug("Failed to parse result value %s", value);
1165                 else if (f != MOUNT_SUCCESS)
1166                         m->result = f;
1167
1168         } else if (streq(key, "reload-result")) {
1169                 MountResult f;
1170
1171                 f = mount_result_from_string(value);
1172                 if (f < 0)
1173                         log_debug("Failed to parse reload result value %s", value);
1174                 else if (f != MOUNT_SUCCESS)
1175                         m->reload_result = f;
1176
1177         } else if (streq(key, "control-pid")) {
1178                 pid_t pid;
1179
1180                 if (parse_pid(value, &pid) < 0)
1181                         log_debug("Failed to parse control-pid value %s", value);
1182                 else
1183                         m->control_pid = pid;
1184         } else if (streq(key, "control-command")) {
1185                 MountExecCommand id;
1186
1187                 if ((id = mount_exec_command_from_string(value)) < 0)
1188                         log_debug("Failed to parse exec-command value %s", value);
1189                 else {
1190                         m->control_command_id = id;
1191                         m->control_command = m->exec_command + id;
1192                 }
1193
1194         } else
1195                 log_debug("Unknown serialization key '%s'", key);
1196
1197         return 0;
1198 }
1199
1200 static UnitActiveState mount_active_state(Unit *u) {
1201         assert(u);
1202
1203         return state_translation_table[MOUNT(u)->state];
1204 }
1205
1206 static const char *mount_sub_state_to_string(Unit *u) {
1207         assert(u);
1208
1209         return mount_state_to_string(MOUNT(u)->state);
1210 }
1211
1212 static bool mount_check_gc(Unit *u) {
1213         Mount *m = MOUNT(u);
1214
1215         assert(m);
1216
1217         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1218 }
1219
1220 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1221         Mount *m = MOUNT(u);
1222         MountResult f;
1223
1224         assert(m);
1225         assert(pid >= 0);
1226
1227         if (pid != m->control_pid)
1228                 return;
1229
1230         m->control_pid = 0;
1231
1232         if (is_clean_exit(code, status))
1233                 f = MOUNT_SUCCESS;
1234         else if (code == CLD_EXITED)
1235                 f = MOUNT_FAILURE_EXIT_CODE;
1236         else if (code == CLD_KILLED)
1237                 f = MOUNT_FAILURE_SIGNAL;
1238         else if (code == CLD_DUMPED)
1239                 f = MOUNT_FAILURE_CORE_DUMP;
1240         else
1241                 assert_not_reached("Unknown code");
1242
1243         if (f != MOUNT_SUCCESS)
1244                 m->result = f;
1245
1246         if (m->control_command) {
1247                 exec_status_exit(&m->control_command->exec_status, &m->exec_context, pid, code, status);
1248
1249                 m->control_command = NULL;
1250                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1251         }
1252
1253         log_full(f == MOUNT_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
1254                  "%s mount process exited, code=%s status=%i", u->id, sigchld_code_to_string(code), status);
1255
1256         /* Note that mount(8) returning and the kernel sending us a
1257          * mount table change event might happen out-of-order. If an
1258          * operation succeed we assume the kernel will follow soon too
1259          * and already change into the resulting state.  If it fails
1260          * we check if the kernel still knows about the mount. and
1261          * change state accordingly. */
1262
1263         switch (m->state) {
1264
1265         case MOUNT_MOUNTING:
1266         case MOUNT_MOUNTING_DONE:
1267         case MOUNT_MOUNTING_SIGKILL:
1268         case MOUNT_MOUNTING_SIGTERM:
1269
1270                 if (f == MOUNT_SUCCESS)
1271                         mount_enter_mounted(m, f);
1272                 else if (m->from_proc_self_mountinfo)
1273                         mount_enter_mounted(m, f);
1274                 else
1275                         mount_enter_dead(m, f);
1276                 break;
1277
1278         case MOUNT_REMOUNTING:
1279         case MOUNT_REMOUNTING_SIGKILL:
1280         case MOUNT_REMOUNTING_SIGTERM:
1281
1282                 m->reload_result = f;
1283                 if (m->from_proc_self_mountinfo)
1284                         mount_enter_mounted(m, MOUNT_SUCCESS);
1285                 else
1286                         mount_enter_dead(m, MOUNT_SUCCESS);
1287
1288                 break;
1289
1290         case MOUNT_UNMOUNTING:
1291         case MOUNT_UNMOUNTING_SIGKILL:
1292         case MOUNT_UNMOUNTING_SIGTERM:
1293
1294                 if (f == MOUNT_SUCCESS)
1295                         mount_enter_dead(m, f);
1296                 else if (m->from_proc_self_mountinfo)
1297                         mount_enter_mounted(m, f);
1298                 else
1299                         mount_enter_dead(m, f);
1300                 break;
1301
1302         default:
1303                 assert_not_reached("Uh, control process died at wrong time.");
1304         }
1305
1306         /* Notify clients about changed exit status */
1307         unit_add_to_dbus_queue(u);
1308 }
1309
1310 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1311         Mount *m = MOUNT(u);
1312
1313         assert(m);
1314         assert(elapsed == 1);
1315         assert(w == &m->timer_watch);
1316
1317         switch (m->state) {
1318
1319         case MOUNT_MOUNTING:
1320         case MOUNT_MOUNTING_DONE:
1321                 log_warning("%s mounting timed out. Stopping.", u->id);
1322                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1323                 break;
1324
1325         case MOUNT_REMOUNTING:
1326                 log_warning("%s remounting timed out. Stopping.", u->id);
1327                 m->reload_result = MOUNT_FAILURE_TIMEOUT;
1328                 mount_enter_mounted(m, MOUNT_SUCCESS);
1329                 break;
1330
1331         case MOUNT_UNMOUNTING:
1332                 log_warning("%s unmounting timed out. Stopping.", u->id);
1333                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, MOUNT_FAILURE_TIMEOUT);
1334                 break;
1335
1336         case MOUNT_MOUNTING_SIGTERM:
1337                 if (m->exec_context.send_sigkill) {
1338                         log_warning("%s mounting timed out. Killing.", u->id);
1339                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1340                 } else {
1341                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->id);
1342
1343                         if (m->from_proc_self_mountinfo)
1344                                 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1345                         else
1346                                 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1347                 }
1348                 break;
1349
1350         case MOUNT_REMOUNTING_SIGTERM:
1351                 if (m->exec_context.send_sigkill) {
1352                         log_warning("%s remounting timed out. Killing.", u->id);
1353                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1354                 } else {
1355                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->id);
1356
1357                         if (m->from_proc_self_mountinfo)
1358                                 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1359                         else
1360                                 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1361                 }
1362                 break;
1363
1364         case MOUNT_UNMOUNTING_SIGTERM:
1365                 if (m->exec_context.send_sigkill) {
1366                         log_warning("%s unmounting timed out. Killing.", u->id);
1367                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, MOUNT_FAILURE_TIMEOUT);
1368                 } else {
1369                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->id);
1370
1371                         if (m->from_proc_self_mountinfo)
1372                                 mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1373                         else
1374                                 mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1375                 }
1376                 break;
1377
1378         case MOUNT_MOUNTING_SIGKILL:
1379         case MOUNT_REMOUNTING_SIGKILL:
1380         case MOUNT_UNMOUNTING_SIGKILL:
1381                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->id);
1382
1383                 if (m->from_proc_self_mountinfo)
1384                         mount_enter_mounted(m, MOUNT_FAILURE_TIMEOUT);
1385                 else
1386                         mount_enter_dead(m, MOUNT_FAILURE_TIMEOUT);
1387                 break;
1388
1389         default:
1390                 assert_not_reached("Timeout at wrong time.");
1391         }
1392 }
1393
1394 static int mount_add_one(
1395                 Manager *m,
1396                 const char *what,
1397                 const char *where,
1398                 const char *options,
1399                 const char *fstype,
1400                 int passno,
1401                 bool from_proc_self_mountinfo,
1402                 bool set_flags) {
1403         int r;
1404         Unit *u;
1405         bool delete;
1406         char *e, *w = NULL, *o = NULL, *f = NULL;
1407         MountParameters *p;
1408
1409         assert(m);
1410         assert(what);
1411         assert(where);
1412         assert(options);
1413         assert(fstype);
1414
1415         assert(!set_flags || from_proc_self_mountinfo);
1416
1417         /* Ignore API mount points. They should never be referenced in
1418          * dependencies ever. */
1419         if (mount_point_is_api(where) || mount_point_ignore(where))
1420                 return 0;
1421
1422         if (streq(fstype, "autofs"))
1423                 return 0;
1424
1425         /* probably some kind of swap, ignore */
1426         if (!is_path(where))
1427                 return 0;
1428
1429         e = unit_name_from_path(where, ".mount");
1430         if (!e)
1431                 return -ENOMEM;
1432
1433         u = manager_get_unit(m, e);
1434         if (!u) {
1435                 delete = true;
1436
1437                 u = unit_new(m, sizeof(Mount));
1438                 if (!u) {
1439                         free(e);
1440                         return -ENOMEM;
1441                 }
1442
1443                 r = unit_add_name(u, e);
1444                 free(e);
1445
1446                 if (r < 0)
1447                         goto fail;
1448
1449                 MOUNT(u)->where = strdup(where);
1450                 if (!MOUNT(u)->where) {
1451                         r = -ENOMEM;
1452                         goto fail;
1453                 }
1454
1455                 unit_add_to_load_queue(u);
1456         } else {
1457                 delete = false;
1458                 free(e);
1459         }
1460
1461         if (!(w = strdup(what)) ||
1462             !(o = strdup(options)) ||
1463             !(f = strdup(fstype))) {
1464                 r = -ENOMEM;
1465                 goto fail;
1466         }
1467
1468         if (from_proc_self_mountinfo) {
1469                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1470
1471                 if (set_flags) {
1472                         MOUNT(u)->is_mounted = true;
1473                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1474                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1475                 }
1476
1477                 MOUNT(u)->from_proc_self_mountinfo = true;
1478         } else {
1479                 p = &MOUNT(u)->parameters_etc_fstab;
1480                 MOUNT(u)->from_etc_fstab = true;
1481         }
1482
1483         free(p->what);
1484         p->what = w;
1485
1486         free(p->options);
1487         p->options = o;
1488
1489         free(p->fstype);
1490         p->fstype = f;
1491
1492         p->passno = passno;
1493
1494         unit_add_to_dbus_queue(u);
1495
1496         return 0;
1497
1498 fail:
1499         free(w);
1500         free(o);
1501         free(f);
1502
1503         if (delete && u)
1504                 unit_free(u);
1505
1506         return r;
1507 }
1508
1509 static int mount_find_pri(char *options) {
1510         char *end, *pri;
1511         unsigned long r;
1512
1513         if (!(pri = mount_test_option(options, "pri")))
1514                 return 0;
1515
1516         pri += 4;
1517
1518         errno = 0;
1519         r = strtoul(pri, &end, 10);
1520
1521         if (errno != 0)
1522                 return -errno;
1523
1524         if (end == pri || (*end != ',' && *end != 0))
1525                 return -EINVAL;
1526
1527         return (int) r;
1528 }
1529
1530 static int mount_load_etc_fstab(Manager *m) {
1531         FILE *f;
1532         int r = 0;
1533         struct mntent* me;
1534
1535         assert(m);
1536
1537         errno = 0;
1538         if (!(f = setmntent("/etc/fstab", "r")))
1539                 return -errno;
1540
1541         while ((me = getmntent(f))) {
1542                 char *where, *what;
1543                 int k;
1544
1545                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1546                         r = -ENOMEM;
1547                         goto finish;
1548                 }
1549
1550                 if (!(where = strdup(me->mnt_dir))) {
1551                         free(what);
1552                         r = -ENOMEM;
1553                         goto finish;
1554                 }
1555
1556                 if (what[0] == '/')
1557                         path_kill_slashes(what);
1558
1559                 if (where[0] == '/')
1560                         path_kill_slashes(where);
1561
1562                 if (streq(me->mnt_type, "swap")) {
1563                         int pri;
1564
1565                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1566                                 k = pri;
1567                         else
1568                                 k = swap_add_one(m,
1569                                                  what,
1570                                                  NULL,
1571                                                  pri,
1572                                                  !!mount_test_option(me->mnt_opts, "noauto"),
1573                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1574                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1575                                                  false);
1576                 } else
1577                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1578
1579                 free(what);
1580                 free(where);
1581
1582                 if (k < 0)
1583                         r = k;
1584         }
1585
1586 finish:
1587
1588         endmntent(f);
1589         return r;
1590 }
1591
1592 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1593         int r = 0;
1594         unsigned i;
1595         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1596
1597         assert(m);
1598
1599         rewind(m->proc_self_mountinfo);
1600
1601         for (i = 1;; i++) {
1602                 int k;
1603
1604                 device = path = options = options2 = fstype = d = p = o = NULL;
1605
1606                 if ((k = fscanf(m->proc_self_mountinfo,
1607                                 "%*s "       /* (1) mount id */
1608                                 "%*s "       /* (2) parent id */
1609                                 "%*s "       /* (3) major:minor */
1610                                 "%*s "       /* (4) root */
1611                                 "%ms "       /* (5) mount point */
1612                                 "%ms"        /* (6) mount options */
1613                                 "%*[^-]"     /* (7) optional fields */
1614                                 "- "         /* (8) separator */
1615                                 "%ms "       /* (9) file system type */
1616                                 "%ms"        /* (10) mount source */
1617                                 "%ms"        /* (11) mount options 2 */
1618                                 "%*[^\n]",   /* some rubbish at the end */
1619                                 &path,
1620                                 &options,
1621                                 &fstype,
1622                                 &device,
1623                                 &options2)) != 5) {
1624
1625                         if (k == EOF)
1626                                 break;
1627
1628                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1629                         goto clean_up;
1630                 }
1631
1632                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1633                         r = -ENOMEM;
1634                         goto finish;
1635                 }
1636
1637                 if (!(d = cunescape(device)) ||
1638                     !(p = cunescape(path))) {
1639                         r = -ENOMEM;
1640                         goto finish;
1641                 }
1642
1643                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1644                         r = k;
1645
1646 clean_up:
1647                 free(device);
1648                 free(path);
1649                 free(options);
1650                 free(options2);
1651                 free(fstype);
1652                 free(d);
1653                 free(p);
1654                 free(o);
1655         }
1656
1657 finish:
1658         free(device);
1659         free(path);
1660         free(options);
1661         free(options2);
1662         free(fstype);
1663         free(d);
1664         free(p);
1665         free(o);
1666
1667         return r;
1668 }
1669
1670 static void mount_shutdown(Manager *m) {
1671         assert(m);
1672
1673         if (m->proc_self_mountinfo) {
1674                 fclose(m->proc_self_mountinfo);
1675                 m->proc_self_mountinfo = NULL;
1676         }
1677 }
1678
1679 static int mount_enumerate(Manager *m) {
1680         int r;
1681         struct epoll_event ev;
1682         assert(m);
1683
1684         if (!m->proc_self_mountinfo) {
1685                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1686                         return -errno;
1687
1688                 m->mount_watch.type = WATCH_MOUNT;
1689                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1690
1691                 zero(ev);
1692                 ev.events = EPOLLPRI;
1693                 ev.data.ptr = &m->mount_watch;
1694
1695                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1696                         return -errno;
1697         }
1698
1699         if ((r = mount_load_etc_fstab(m)) < 0)
1700                 goto fail;
1701
1702         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1703                 goto fail;
1704
1705         return 0;
1706
1707 fail:
1708         mount_shutdown(m);
1709         return r;
1710 }
1711
1712 void mount_fd_event(Manager *m, int events) {
1713         Unit *u;
1714         int r;
1715
1716         assert(m);
1717         assert(events & EPOLLPRI);
1718
1719         /* The manager calls this for every fd event happening on the
1720          * /proc/self/mountinfo file, which informs us about mounting
1721          * table changes */
1722
1723         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1724                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1725
1726                 /* Reset flags, just in case, for later calls */
1727                 LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1728                         Mount *mount = MOUNT(u);
1729
1730                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1731                 }
1732
1733                 return;
1734         }
1735
1736         manager_dispatch_load_queue(m);
1737
1738         LIST_FOREACH(units_by_type, u, m->units_by_type[UNIT_MOUNT]) {
1739                 Mount *mount = MOUNT(u);
1740
1741                 if (!mount->is_mounted) {
1742                         /* This has just been unmounted. */
1743
1744                         mount->from_proc_self_mountinfo = false;
1745
1746                         switch (mount->state) {
1747
1748                         case MOUNT_MOUNTED:
1749                                 mount_enter_dead(mount, MOUNT_SUCCESS);
1750                                 break;
1751
1752                         default:
1753                                 mount_set_state(mount, mount->state);
1754                                 break;
1755
1756                         }
1757
1758                 } else if (mount->just_mounted || mount->just_changed) {
1759
1760                         /* New or changed mount entry */
1761
1762                         switch (mount->state) {
1763
1764                         case MOUNT_DEAD:
1765                         case MOUNT_FAILED:
1766                                 mount_enter_mounted(mount, MOUNT_SUCCESS);
1767                                 break;
1768
1769                         case MOUNT_MOUNTING:
1770                                 mount_enter_mounting_done(mount);
1771                                 break;
1772
1773                         default:
1774                                 /* Nothing really changed, but let's
1775                                  * issue an notification call
1776                                  * nonetheless, in case somebody is
1777                                  * waiting for this. (e.g. file system
1778                                  * ro/rw remounts.) */
1779                                 mount_set_state(mount, mount->state);
1780                                 break;
1781                         }
1782                 }
1783
1784                 /* Reset the flags for later calls */
1785                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1786         }
1787 }
1788
1789 static void mount_reset_failed(Unit *u) {
1790         Mount *m = MOUNT(u);
1791
1792         assert(m);
1793
1794         if (m->state == MOUNT_FAILED)
1795                 mount_set_state(m, MOUNT_DEAD);
1796
1797         m->result = MOUNT_SUCCESS;
1798         m->reload_result = MOUNT_SUCCESS;
1799 }
1800
1801 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1802         Mount *m = MOUNT(u);
1803         int r = 0;
1804         Set *pid_set = NULL;
1805
1806         assert(m);
1807
1808         if (who == KILL_MAIN) {
1809                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1810                 return -ESRCH;
1811         }
1812
1813         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1814                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1815                 return -ESRCH;
1816         }
1817
1818         if (who == KILL_CONTROL || who == KILL_ALL)
1819                 if (m->control_pid > 0)
1820                         if (kill(m->control_pid, signo) < 0)
1821                                 r = -errno;
1822
1823         if (who == KILL_ALL && mode == KILL_CONTROL_GROUP) {
1824                 int q;
1825
1826                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1827                         return -ENOMEM;
1828
1829                 /* Exclude the control pid from being killed via the cgroup */
1830                 if (m->control_pid > 0)
1831                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1832                                 r = q;
1833                                 goto finish;
1834                         }
1835
1836                 if ((q = cgroup_bonding_kill_list(UNIT(m)->cgroup_bondings, signo, false, pid_set)) < 0)
1837                         if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
1838                                 r = q;
1839         }
1840
1841 finish:
1842         if (pid_set)
1843                 set_free(pid_set);
1844
1845         return r;
1846 }
1847
1848 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1849         [MOUNT_DEAD] = "dead",
1850         [MOUNT_MOUNTING] = "mounting",
1851         [MOUNT_MOUNTING_DONE] = "mounting-done",
1852         [MOUNT_MOUNTED] = "mounted",
1853         [MOUNT_REMOUNTING] = "remounting",
1854         [MOUNT_UNMOUNTING] = "unmounting",
1855         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1856         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1857         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1858         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1859         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1860         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1861         [MOUNT_FAILED] = "failed"
1862 };
1863
1864 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1865
1866 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1867         [MOUNT_EXEC_MOUNT] = "ExecMount",
1868         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1869         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1870 };
1871
1872 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1873
1874 static const char* const mount_result_table[_MOUNT_RESULT_MAX] = {
1875         [MOUNT_SUCCESS] = "success",
1876         [MOUNT_FAILURE_RESOURCES] = "resources",
1877         [MOUNT_FAILURE_TIMEOUT] = "timeout",
1878         [MOUNT_FAILURE_EXIT_CODE] = "exit-code",
1879         [MOUNT_FAILURE_SIGNAL] = "signal",
1880         [MOUNT_FAILURE_CORE_DUMP] = "core-dump"
1881 };
1882
1883 DEFINE_STRING_TABLE_LOOKUP(mount_result, MountResult);
1884
1885 const UnitVTable mount_vtable = {
1886         .suffix = ".mount",
1887         .object_size = sizeof(Mount),
1888         .sections =
1889                 "Unit\0"
1890                 "Mount\0"
1891                 "Install\0",
1892
1893         .no_alias = true,
1894         .no_instances = true,
1895         .show_status = true,
1896
1897         .init = mount_init,
1898         .load = mount_load,
1899         .done = mount_done,
1900
1901         .coldplug = mount_coldplug,
1902
1903         .dump = mount_dump,
1904
1905         .start = mount_start,
1906         .stop = mount_stop,
1907         .reload = mount_reload,
1908
1909         .kill = mount_kill,
1910
1911         .serialize = mount_serialize,
1912         .deserialize_item = mount_deserialize_item,
1913
1914         .active_state = mount_active_state,
1915         .sub_state_to_string = mount_sub_state_to_string,
1916
1917         .check_gc = mount_check_gc,
1918
1919         .sigchld_event = mount_sigchld_event,
1920         .timer_event = mount_timer_event,
1921
1922         .reset_failed = mount_reset_failed,
1923
1924         .bus_interface = "org.freedesktop.systemd1.Mount",
1925         .bus_message_handler = bus_mount_message_handler,
1926         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1927
1928         .enumerate = mount_enumerate,
1929         .shutdown = mount_shutdown
1930 };