src/mount.c

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