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