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_fix_timeouts(Mount *m) {
 464         MountParameters *p;
 465         const char *timeout = NULL;
 466         Unit *other;
 467         Iterator i;
 468         usec_t u;
 469         char *t;
 470         int r;
 471
 472         assert(m);
 473
 474         if (!(p = get_mount_parameters_configured(m)))
 475                 return 0;
 476
 477         /* Allow configuration how long we wait for a device that
 478          * backs a mount point to show up. This is useful to support
 479          * endless device timeouts for devices that show up only after
 480          * user input, like crypto devices. */
 481
 482         if ((timeout = mount_test_option(p->options, "comment=systemd.device-timeout")))
 483                 timeout += 31;
 484         else if ((timeout = mount_test_option(p->options, "x-systemd-device-timeout")))
 485                 timeout += 25;
 486         else
 487                 return 0;
 488
 489         t = strndup(timeout, strcspn(timeout, ",;" WHITESPACE));
 490         if (!t)
 491                 return -ENOMEM;
 492
 493         r = parse_usec(t, &u);
 494         free(t);
 495
 496         if (r < 0) {
 497                 log_warning("Failed to parse timeout for %s, ignoring: %s", m->where, timeout);
 498                 return r;
 499         }
 500
 501         SET_FOREACH(other, m->meta.dependencies[UNIT_AFTER], i) {
 502                 if (other->meta.type != UNIT_DEVICE)
 503                         continue;
 504
 505                 other->meta.job_timeout = u;
 506         }
 507
 508         return 0;
 509 }
 510
 511 static int mount_verify(Mount *m) {
 512         bool b;
 513         char *e;
 514         assert(m);
 515
 516         if (m->meta.load_state != UNIT_LOADED)
 517                 return 0;
 518
 519         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 520                 return -ENOENT;
 521
 522         if (!(e = unit_name_from_path(m->where, ".mount")))
 523                 return -ENOMEM;
 524
 525         b = unit_has_name(UNIT(m), e);
 526         free(e);
 527
 528         if (!b) {
 529                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 530                 return -EINVAL;
 531         }
 532
 533         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 534                 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
 535                 return -EINVAL;
 536         }
 537
 538         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 539                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 540                 return -EBADMSG;
 541         }
 542
 543         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 544                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 545                 return -EINVAL;
 546         }
 547
 548         return 0;
 549 }
 550
 551 static int mount_load(Unit *u) {
 552         Mount *m = MOUNT(u);
 553         int r;
 554
 555         assert(u);
 556         assert(u->meta.load_state == UNIT_STUB);
 557
 558         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 559                 return r;
 560
 561         /* This is a new unit? Then let's add in some extras */
 562         if (u->meta.load_state == UNIT_LOADED) {
 563                 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
 564                         return r;
 565
 566                 if (m->meta.fragment_path)
 567                         m->from_fragment = true;
 568
 569                 if (!m->where)
 570                         if (!(m->where = unit_name_to_path(u->meta.id)))
 571                                 return -ENOMEM;
 572
 573                 path_kill_slashes(m->where);
 574
 575                 if (!m->meta.description)
 576                         if ((r = unit_set_description(u, m->where)) < 0)
 577                                 return r;
 578
 579                 if ((r = mount_add_device_links(m)) < 0)
 580                         return r;
 581
 582                 if ((r = mount_add_mount_links(m)) < 0)
 583                         return r;
 584
 585                 if ((r = mount_add_socket_links(m)) < 0)
 586                         return r;
 587
 588                 if ((r = mount_add_swap_links(m)) < 0)
 589                         return r;
 590
 591                 if ((r = mount_add_path_links(m)) < 0)
 592                         return r;
 593
 594                 if ((r = mount_add_automount_links(m)) < 0)
 595                         return r;
 596
 597                 if ((r = mount_add_target_links(m)) < 0)
 598                         return r;
 599
 600                 if ((r = unit_add_default_cgroups(u)) < 0)
 601                         return r;
 602
 603                 if (m->meta.default_dependencies)
 604                         if ((r = mount_add_default_dependencies(m)) < 0)
 605                                 return r;
 606
 607                 mount_fix_timeouts(m);
 608         }
 609
 610         return mount_verify(m);
 611 }
 612
 613 static int mount_notify_automount(Mount *m, int status) {
 614         Unit *p;
 615         int r;
 616
 617         assert(m);
 618
 619         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 620                 return r == -ENOENT ? 0 : r;
 621
 622         return automount_send_ready(AUTOMOUNT(p), status);
 623 }
 624
 625 static void mount_set_state(Mount *m, MountState state) {
 626         MountState old_state;
 627         assert(m);
 628
 629         old_state = m->state;
 630         m->state = state;
 631
 632         if (state != MOUNT_MOUNTING &&
 633             state != MOUNT_MOUNTING_DONE &&
 634             state != MOUNT_REMOUNTING &&
 635             state != MOUNT_UNMOUNTING &&
 636             state != MOUNT_MOUNTING_SIGTERM &&
 637             state != MOUNT_MOUNTING_SIGKILL &&
 638             state != MOUNT_UNMOUNTING_SIGTERM &&
 639             state != MOUNT_UNMOUNTING_SIGKILL &&
 640             state != MOUNT_REMOUNTING_SIGTERM &&
 641             state != MOUNT_REMOUNTING_SIGKILL) {
 642                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 643                 mount_unwatch_control_pid(m);
 644                 m->control_command = NULL;
 645                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 646         }
 647
 648         if (state == MOUNT_MOUNTED ||
 649             state == MOUNT_REMOUNTING)
 650                 mount_notify_automount(m, 0);
 651         else if (state == MOUNT_DEAD ||
 652                  state == MOUNT_UNMOUNTING ||
 653                  state == MOUNT_MOUNTING_SIGTERM ||
 654                  state == MOUNT_MOUNTING_SIGKILL ||
 655                  state == MOUNT_REMOUNTING_SIGTERM ||
 656                  state == MOUNT_REMOUNTING_SIGKILL ||
 657                  state == MOUNT_UNMOUNTING_SIGTERM ||
 658                  state == MOUNT_UNMOUNTING_SIGKILL ||
 659                  state == MOUNT_FAILED)
 660                 mount_notify_automount(m, -ENODEV);
 661
 662         if (state != old_state)
 663                 log_debug("%s changed %s -> %s",
 664                           m->meta.id,
 665                           mount_state_to_string(old_state),
 666                           mount_state_to_string(state));
 667
 668         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], !m->reload_failure);
 669         m->reload_failure = false;
 670 }
 671
 672 static int mount_coldplug(Unit *u) {
 673         Mount *m = MOUNT(u);
 674         MountState new_state = MOUNT_DEAD;
 675         int r;
 676
 677         assert(m);
 678         assert(m->state == MOUNT_DEAD);
 679
 680         if (m->deserialized_state != m->state)
 681                 new_state = m->deserialized_state;
 682         else if (m->from_proc_self_mountinfo)
 683                 new_state = MOUNT_MOUNTED;
 684
 685         if (new_state != m->state) {
 686
 687                 if (new_state == MOUNT_MOUNTING ||
 688                     new_state == MOUNT_MOUNTING_DONE ||
 689                     new_state == MOUNT_REMOUNTING ||
 690                     new_state == MOUNT_UNMOUNTING ||
 691                     new_state == MOUNT_MOUNTING_SIGTERM ||
 692                     new_state == MOUNT_MOUNTING_SIGKILL ||
 693                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 694                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 695                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 696                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 697
 698                         if (m->control_pid <= 0)
 699                                 return -EBADMSG;
 700
 701                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 702                                 return r;
 703
 704                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 705                                 return r;
 706                 }
 707
 708                 mount_set_state(m, new_state);
 709         }
 710
 711         return 0;
 712 }
 713
 714 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 715         Mount *m = MOUNT(u);
 716         MountParameters *p;
 717
 718         assert(m);
 719         assert(f);
 720
 721         p = get_mount_parameters(m);
 722
 723         fprintf(f,
 724                 "%sMount State: %s\n"
 725                 "%sWhere: %s\n"
 726                 "%sWhat: %s\n"
 727                 "%sFile System Type: %s\n"
 728                 "%sOptions: %s\n"
 729                 "%sFrom /etc/fstab: %s\n"
 730                 "%sFrom /proc/self/mountinfo: %s\n"
 731                 "%sFrom fragment: %s\n"
 732                 "%sDirectoryMode: %04o\n",
 733                 prefix, mount_state_to_string(m->state),
 734                 prefix, m->where,
 735                 prefix, strna(p->what),
 736                 prefix, strna(p->fstype),
 737                 prefix, strna(p->options),
 738                 prefix, yes_no(m->from_etc_fstab),
 739                 prefix, yes_no(m->from_proc_self_mountinfo),
 740                 prefix, yes_no(m->from_fragment),
 741                 prefix, m->directory_mode);
 742
 743         if (m->control_pid > 0)
 744                 fprintf(f,
 745                         "%sControl PID: %lu\n",
 746                         prefix, (unsigned long) m->control_pid);
 747
 748         exec_context_dump(&m->exec_context, f, prefix);
 749 }
 750
 751 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 752         pid_t pid;
 753         int r;
 754
 755         assert(m);
 756         assert(c);
 757         assert(_pid);
 758
 759         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 760                 goto fail;
 761
 762         if ((r = exec_spawn(c,
 763                             NULL,
 764                             &m->exec_context,
 765                             NULL, 0,
 766                             m->meta.manager->environment,
 767                             true,
 768                             true,
 769                             true,
 770                             m->meta.manager->confirm_spawn,
 771                             m->meta.cgroup_bondings,
 772                             &pid)) < 0)
 773                 goto fail;
 774
 775         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 776                 /* FIXME: we need to do something here */
 777                 goto fail;
 778
 779         *_pid = pid;
 780
 781         return 0;
 782
 783 fail:
 784         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 785
 786         return r;
 787 }
 788
 789 static void mount_enter_dead(Mount *m, bool success) {
 790         assert(m);
 791
 792         if (!success)
 793                 m->failure = true;
 794
 795         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 796 }
 797
 798 static void mount_enter_mounted(Mount *m, bool success) {
 799         assert(m);
 800
 801         if (!success)
 802                 m->failure = true;
 803
 804         mount_set_state(m, MOUNT_MOUNTED);
 805 }
 806
 807 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 808         int r;
 809         Set *pid_set = NULL;
 810         bool wait_for_exit = false;
 811
 812         assert(m);
 813
 814         if (!success)
 815                 m->failure = true;
 816
 817         if (m->exec_context.kill_mode != KILL_NONE) {
 818                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 819                            state == MOUNT_UNMOUNTING_SIGTERM ||
 820                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 821
 822                 if (m->control_pid > 0) {
 823                         if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
 824
 825                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 826                         else
 827                                 wait_for_exit = true;
 828                 }
 829
 830                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 831
 832                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 833                                 r = -ENOMEM;
 834                                 goto fail;
 835                         }
 836
 837                         /* Exclude the control pid from being killed via the cgroup */
 838                         if (m->control_pid > 0)
 839                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 840                                         goto fail;
 841
 842                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
 843                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 844                                         log_warning("Failed to kill control group: %s", strerror(-r));
 845                         } else if (r > 0)
 846                                 wait_for_exit = true;
 847
 848                         set_free(pid_set);
 849                         pid_set = NULL;
 850                 }
 851         }
 852
 853         if (wait_for_exit) {
 854                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 855                         goto fail;
 856
 857                 mount_set_state(m, state);
 858         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 859                 mount_enter_mounted(m, true);
 860         else
 861                 mount_enter_dead(m, true);
 862
 863         return;
 864
 865 fail:
 866         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 867
 868         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 869                 mount_enter_mounted(m, false);
 870         else
 871                 mount_enter_dead(m, false);
 872
 873         if (pid_set)
 874                 set_free(pid_set);
 875 }
 876
 877 static void mount_enter_unmounting(Mount *m, bool success) {
 878         int r;
 879
 880         assert(m);
 881
 882         if (!success)
 883                 m->failure = true;
 884
 885         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 886         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 887
 888         if ((r = exec_command_set(
 889                              m->control_command,
 890                              "/bin/umount",
 891                              m->where,
 892                              NULL)) < 0)
 893                 goto fail;
 894
 895         mount_unwatch_control_pid(m);
 896
 897         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 898                 goto fail;
 899
 900         mount_set_state(m, MOUNT_UNMOUNTING);
 901
 902         return;
 903
 904 fail:
 905         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 906         mount_enter_mounted(m, false);
 907 }
 908
 909 static void mount_enter_mounting(Mount *m) {
 910         int r;
 911         MountParameters *p;
 912
 913         assert(m);
 914
 915         m->control_command_id = MOUNT_EXEC_MOUNT;
 916         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 917
 918         mkdir_p(m->where, m->directory_mode);
 919
 920         /* Create the source directory for bind-mounts if needed */
 921         p = get_mount_parameters_configured(m);
 922         if (p && mount_is_bind(p))
 923                 mkdir_p(p->what, m->directory_mode);
 924
 925         if (m->from_fragment)
 926                 r = exec_command_set(
 927                                 m->control_command,
 928                                 "/bin/mount",
 929                                 m->parameters_fragment.what,
 930                                 m->where,
 931                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 932                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 933                                 NULL);
 934         else if (m->from_etc_fstab)
 935                 r = exec_command_set(
 936                                 m->control_command,
 937                                 "/bin/mount",
 938                                 m->where,
 939                                 NULL);
 940         else
 941                 r = -ENOENT;
 942
 943         if (r < 0)
 944                 goto fail;
 945
 946         mount_unwatch_control_pid(m);
 947
 948         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 949                 goto fail;
 950
 951         mount_set_state(m, MOUNT_MOUNTING);
 952
 953         return;
 954
 955 fail:
 956         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 957         mount_enter_dead(m, false);
 958 }
 959
 960 static void mount_enter_mounting_done(Mount *m) {
 961         assert(m);
 962
 963         mount_set_state(m, MOUNT_MOUNTING_DONE);
 964 }
 965
 966 static void mount_enter_remounting(Mount *m, bool success) {
 967         int r;
 968
 969         assert(m);
 970
 971         if (!success)
 972                 m->failure = true;
 973
 974         m->control_command_id = MOUNT_EXEC_REMOUNT;
 975         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 976
 977         if (m->from_fragment) {
 978                 char *buf = NULL;
 979                 const char *o;
 980
 981                 if (m->parameters_fragment.options) {
 982                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 983                                 r = -ENOMEM;
 984                                 goto fail;
 985                         }
 986
 987                         o = buf;
 988                 } else
 989                         o = "remount";
 990
 991                 r = exec_command_set(
 992                                 m->control_command,
 993                                 "/bin/mount",
 994                                 m->parameters_fragment.what,
 995                                 m->where,
 996                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 997                                 "-o", o,
 998                                 NULL);
 999
1000                 free(buf);
1001         } else if (m->from_etc_fstab)
1002                 r = exec_command_set(
1003                                 m->control_command,
1004                                 "/bin/mount",
1005                                 m->where,
1006                                 "-o", "remount",
1007                                 NULL);
1008         else
1009                 r = -ENOENT;
1010
1011         if (r < 0)
1012                 goto fail;
1013
1014         mount_unwatch_control_pid(m);
1015
1016         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
1017                 goto fail;
1018
1019         mount_set_state(m, MOUNT_REMOUNTING);
1020
1021         return;
1022
1023 fail:
1024         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
1025         m->reload_failure = true;
1026         mount_enter_mounted(m, true);
1027 }
1028
1029 static int mount_start(Unit *u) {
1030         Mount *m = MOUNT(u);
1031
1032         assert(m);
1033
1034         /* We cannot fulfill this request right now, try again later
1035          * please! */
1036         if (m->state == MOUNT_UNMOUNTING ||
1037             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1038             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1039             m->state == MOUNT_MOUNTING_SIGTERM ||
1040             m->state == MOUNT_MOUNTING_SIGKILL)
1041                 return -EAGAIN;
1042
1043         /* Already on it! */
1044         if (m->state == MOUNT_MOUNTING)
1045                 return 0;
1046
1047         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
1048
1049         m->failure = false;
1050         mount_enter_mounting(m);
1051         return 0;
1052 }
1053
1054 static int mount_stop(Unit *u) {
1055         Mount *m = MOUNT(u);
1056
1057         assert(m);
1058
1059         /* Already on it */
1060         if (m->state == MOUNT_UNMOUNTING ||
1061             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1062             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1063             m->state == MOUNT_MOUNTING_SIGTERM ||
1064             m->state == MOUNT_MOUNTING_SIGKILL)
1065                 return 0;
1066
1067         assert(m->state == MOUNT_MOUNTING ||
1068                m->state == MOUNT_MOUNTING_DONE ||
1069                m->state == MOUNT_MOUNTED ||
1070                m->state == MOUNT_REMOUNTING ||
1071                m->state == MOUNT_REMOUNTING_SIGTERM ||
1072                m->state == MOUNT_REMOUNTING_SIGKILL);
1073
1074         mount_enter_unmounting(m, true);
1075         return 0;
1076 }
1077
1078 static int mount_reload(Unit *u) {
1079         Mount *m = MOUNT(u);
1080
1081         assert(m);
1082
1083         if (m->state == MOUNT_MOUNTING_DONE)
1084                 return -EAGAIN;
1085
1086         assert(m->state == MOUNT_MOUNTED);
1087
1088         mount_enter_remounting(m, true);
1089         return 0;
1090 }
1091
1092 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1093         Mount *m = MOUNT(u);
1094
1095         assert(m);
1096         assert(f);
1097         assert(fds);
1098
1099         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1100         unit_serialize_item(u, f, "failure", yes_no(m->failure));
1101
1102         if (m->control_pid > 0)
1103                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1104
1105         if (m->control_command_id >= 0)
1106                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1107
1108         return 0;
1109 }
1110
1111 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1112         Mount *m = MOUNT(u);
1113
1114         assert(u);
1115         assert(key);
1116         assert(value);
1117         assert(fds);
1118
1119         if (streq(key, "state")) {
1120                 MountState state;
1121
1122                 if ((state = mount_state_from_string(value)) < 0)
1123                         log_debug("Failed to parse state value %s", value);
1124                 else
1125                         m->deserialized_state = state;
1126         } else if (streq(key, "failure")) {
1127                 int b;
1128
1129                 if ((b = parse_boolean(value)) < 0)
1130                         log_debug("Failed to parse failure value %s", value);
1131                 else
1132                         m->failure = b || m->failure;
1133
1134         } else if (streq(key, "control-pid")) {
1135                 pid_t pid;
1136
1137                 if (parse_pid(value, &pid) < 0)
1138                         log_debug("Failed to parse control-pid value %s", value);
1139                 else
1140                         m->control_pid = pid;
1141         } else if (streq(key, "control-command")) {
1142                 MountExecCommand id;
1143
1144                 if ((id = mount_exec_command_from_string(value)) < 0)
1145                         log_debug("Failed to parse exec-command value %s", value);
1146                 else {
1147                         m->control_command_id = id;
1148                         m->control_command = m->exec_command + id;
1149                 }
1150
1151         } else
1152                 log_debug("Unknown serialization key '%s'", key);
1153
1154         return 0;
1155 }
1156
1157 static UnitActiveState mount_active_state(Unit *u) {
1158         assert(u);
1159
1160         return state_translation_table[MOUNT(u)->state];
1161 }
1162
1163 static const char *mount_sub_state_to_string(Unit *u) {
1164         assert(u);
1165
1166         return mount_state_to_string(MOUNT(u)->state);
1167 }
1168
1169 static bool mount_check_gc(Unit *u) {
1170         Mount *m = MOUNT(u);
1171
1172         assert(m);
1173
1174         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1175 }
1176
1177 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1178         Mount *m = MOUNT(u);
1179         bool success;
1180
1181         assert(m);
1182         assert(pid >= 0);
1183
1184         if (pid != m->control_pid)
1185                 return;
1186
1187         m->control_pid = 0;
1188
1189         success = is_clean_exit(code, status);
1190         m->failure = m->failure || !success;
1191
1192         if (m->control_command) {
1193                 exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id);
1194                 m->control_command = NULL;
1195                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1196         }
1197
1198         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1199                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1200
1201         /* Note that mount(8) returning and the kernel sending us a
1202          * mount table change event might happen out-of-order. If an
1203          * operation succeed we assume the kernel will follow soon too
1204          * and already change into the resulting state.  If it fails
1205          * we check if the kernel still knows about the mount. and
1206          * change state accordingly. */
1207
1208         switch (m->state) {
1209
1210         case MOUNT_MOUNTING:
1211         case MOUNT_MOUNTING_DONE:
1212         case MOUNT_MOUNTING_SIGKILL:
1213         case MOUNT_MOUNTING_SIGTERM:
1214
1215                 if (success)
1216                         mount_enter_mounted(m, true);
1217                 else if (m->from_proc_self_mountinfo)
1218                         mount_enter_mounted(m, false);
1219                 else
1220                         mount_enter_dead(m, false);
1221                 break;
1222
1223         case MOUNT_REMOUNTING:
1224         case MOUNT_REMOUNTING_SIGKILL:
1225         case MOUNT_REMOUNTING_SIGTERM:
1226
1227                 m->reload_failure = !success;
1228                 if (m->from_proc_self_mountinfo)
1229                         mount_enter_mounted(m, true);
1230                 else
1231                         mount_enter_dead(m, true);
1232
1233                 break;
1234
1235         case MOUNT_UNMOUNTING:
1236         case MOUNT_UNMOUNTING_SIGKILL:
1237         case MOUNT_UNMOUNTING_SIGTERM:
1238
1239                 if (success)
1240                         mount_enter_dead(m, true);
1241                 else if (m->from_proc_self_mountinfo)
1242                         mount_enter_mounted(m, false);
1243                 else
1244                         mount_enter_dead(m, false);
1245                 break;
1246
1247         default:
1248                 assert_not_reached("Uh, control process died at wrong time.");
1249         }
1250
1251         /* Notify clients about changed exit status */
1252         unit_add_to_dbus_queue(u);
1253 }
1254
1255 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1256         Mount *m = MOUNT(u);
1257
1258         assert(m);
1259         assert(elapsed == 1);
1260         assert(w == &m->timer_watch);
1261
1262         switch (m->state) {
1263
1264         case MOUNT_MOUNTING:
1265         case MOUNT_MOUNTING_DONE:
1266                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1267                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1268                 break;
1269
1270         case MOUNT_REMOUNTING:
1271                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1272                 m->reload_failure = true;
1273                 mount_enter_mounted(m, true);
1274                 break;
1275
1276         case MOUNT_UNMOUNTING:
1277                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1278                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1279                 break;
1280
1281         case MOUNT_MOUNTING_SIGTERM:
1282                 if (m->exec_context.send_sigkill) {
1283                         log_warning("%s mounting timed out. Killing.", u->meta.id);
1284                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1285                 } else {
1286                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1287
1288                         if (m->from_proc_self_mountinfo)
1289                                 mount_enter_mounted(m, false);
1290                         else
1291                                 mount_enter_dead(m, false);
1292                 }
1293                 break;
1294
1295         case MOUNT_REMOUNTING_SIGTERM:
1296                 if (m->exec_context.send_sigkill) {
1297                         log_warning("%s remounting timed out. Killing.", u->meta.id);
1298                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1299                 } else {
1300                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1301
1302                         if (m->from_proc_self_mountinfo)
1303                                 mount_enter_mounted(m, false);
1304                         else
1305                                 mount_enter_dead(m, false);
1306                 }
1307                 break;
1308
1309         case MOUNT_UNMOUNTING_SIGTERM:
1310                 if (m->exec_context.send_sigkill) {
1311                         log_warning("%s unmounting timed out. Killing.", u->meta.id);
1312                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1313                 } else {
1314                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1315
1316                         if (m->from_proc_self_mountinfo)
1317                                 mount_enter_mounted(m, false);
1318                         else
1319                                 mount_enter_dead(m, false);
1320                 }
1321                 break;
1322
1323         case MOUNT_MOUNTING_SIGKILL:
1324         case MOUNT_REMOUNTING_SIGKILL:
1325         case MOUNT_UNMOUNTING_SIGKILL:
1326                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1327
1328                 if (m->from_proc_self_mountinfo)
1329                         mount_enter_mounted(m, false);
1330                 else
1331                         mount_enter_dead(m, false);
1332                 break;
1333
1334         default:
1335                 assert_not_reached("Timeout at wrong time.");
1336         }
1337 }
1338
1339 static int mount_add_one(
1340                 Manager *m,
1341                 const char *what,
1342                 const char *where,
1343                 const char *options,
1344                 const char *fstype,
1345                 int passno,
1346                 bool from_proc_self_mountinfo,
1347                 bool set_flags) {
1348         int r;
1349         Unit *u;
1350         bool delete;
1351         char *e, *w = NULL, *o = NULL, *f = NULL;
1352         MountParameters *p;
1353
1354         assert(m);
1355         assert(what);
1356         assert(where);
1357         assert(options);
1358         assert(fstype);
1359
1360         assert(!set_flags || from_proc_self_mountinfo);
1361
1362         /* Ignore API mount points. They should never be referenced in
1363          * dependencies ever. */
1364         if (mount_point_is_api(where) || mount_point_ignore(where))
1365                 return 0;
1366
1367         if (streq(fstype, "autofs"))
1368                 return 0;
1369
1370         /* probably some kind of swap, ignore */
1371         if (!is_path(where))
1372                 return 0;
1373
1374         if (!(e = unit_name_from_path(where, ".mount")))
1375                 return -ENOMEM;
1376
1377         if (!(u = manager_get_unit(m, e))) {
1378                 delete = true;
1379
1380                 if (!(u = unit_new(m))) {
1381                         free(e);
1382                         return -ENOMEM;
1383                 }
1384
1385                 r = unit_add_name(u, e);
1386                 free(e);
1387
1388                 if (r < 0)
1389                         goto fail;
1390
1391                 if (!(MOUNT(u)->where = strdup(where))) {
1392                         r = -ENOMEM;
1393                         goto fail;
1394                 }
1395
1396                 unit_add_to_load_queue(u);
1397         } else {
1398                 delete = false;
1399                 free(e);
1400         }
1401
1402         if (!(w = strdup(what)) ||
1403             !(o = strdup(options)) ||
1404             !(f = strdup(fstype))) {
1405                 r = -ENOMEM;
1406                 goto fail;
1407         }
1408
1409         if (from_proc_self_mountinfo) {
1410                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1411
1412                 if (set_flags) {
1413                         MOUNT(u)->is_mounted = true;
1414                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1415                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1416                 }
1417
1418                 MOUNT(u)->from_proc_self_mountinfo = true;
1419         } else {
1420                 p = &MOUNT(u)->parameters_etc_fstab;
1421                 MOUNT(u)->from_etc_fstab = true;
1422         }
1423
1424         free(p->what);
1425         p->what = w;
1426
1427         free(p->options);
1428         p->options = o;
1429
1430         free(p->fstype);
1431         p->fstype = f;
1432
1433         p->passno = passno;
1434
1435         unit_add_to_dbus_queue(u);
1436
1437         return 0;
1438
1439 fail:
1440         free(w);
1441         free(o);
1442         free(f);
1443
1444         if (delete && u)
1445                 unit_free(u);
1446
1447         return r;
1448 }
1449
1450 static int mount_find_pri(char *options) {
1451         char *end, *pri;
1452         unsigned long r;
1453
1454         if (!(pri = mount_test_option(options, "pri=")))
1455                 return 0;
1456
1457         pri += 4;
1458
1459         errno = 0;
1460         r = strtoul(pri, &end, 10);
1461
1462         if (errno != 0)
1463                 return -errno;
1464
1465         if (end == pri || (*end != ',' && *end != 0))
1466                 return -EINVAL;
1467
1468         return (int) r;
1469 }
1470
1471 static int mount_load_etc_fstab(Manager *m) {
1472         FILE *f;
1473         int r = 0;
1474         struct mntent* me;
1475
1476         assert(m);
1477
1478         errno = 0;
1479         if (!(f = setmntent("/etc/fstab", "r")))
1480                 return -errno;
1481
1482         while ((me = getmntent(f))) {
1483                 char *where, *what;
1484                 int k;
1485
1486                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1487                         r = -ENOMEM;
1488                         goto finish;
1489                 }
1490
1491                 if (!(where = strdup(me->mnt_dir))) {
1492                         free(what);
1493                         r = -ENOMEM;
1494                         goto finish;
1495                 }
1496
1497                 if (what[0] == '/')
1498                         path_kill_slashes(what);
1499
1500                 if (where[0] == '/')
1501                         path_kill_slashes(where);
1502
1503                 if (streq(me->mnt_type, "swap")) {
1504                         int pri;
1505
1506                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1507                                 k = pri;
1508                         else
1509                                 k = swap_add_one(m,
1510                                                  what,
1511                                                  NULL,
1512                                                  pri,
1513                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1514                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1515                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1516                                                  false);
1517                 } else
1518                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1519
1520                 free(what);
1521                 free(where);
1522
1523                 if (r < 0)
1524                         r = k;
1525         }
1526
1527 finish:
1528
1529         endmntent(f);
1530         return r;
1531 }
1532
1533 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1534         int r = 0;
1535         unsigned i;
1536         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1537
1538         assert(m);
1539
1540         rewind(m->proc_self_mountinfo);
1541
1542         for (i = 1;; i++) {
1543                 int k;
1544
1545                 device = path = options = options2 = fstype = d = p = o = NULL;
1546
1547                 if ((k = fscanf(m->proc_self_mountinfo,
1548                                 "%*s "       /* (1) mount id */
1549                                 "%*s "       /* (2) parent id */
1550                                 "%*s "       /* (3) major:minor */
1551                                 "%*s "       /* (4) root */
1552                                 "%ms "       /* (5) mount point */
1553                                 "%ms"        /* (6) mount options */
1554                                 "%*[^-]"     /* (7) optional fields */
1555                                 "- "         /* (8) separator */
1556                                 "%ms "       /* (9) file system type */
1557                                 "%ms"        /* (10) mount source */
1558                                 "%ms"        /* (11) mount options 2 */
1559                                 "%*[^\n]",   /* some rubbish at the end */
1560                                 &path,
1561                                 &options,
1562                                 &fstype,
1563                                 &device,
1564                                 &options2)) != 5) {
1565
1566                         if (k == EOF)
1567                                 break;
1568
1569                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1570                         goto clean_up;
1571                 }
1572
1573                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1574                         r = -ENOMEM;
1575                         goto finish;
1576                 }
1577
1578                 if (!(d = cunescape(device)) ||
1579                     !(p = cunescape(path))) {
1580                         r = -ENOMEM;
1581                         goto finish;
1582                 }
1583
1584                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1585                         r = k;
1586
1587 clean_up:
1588                 free(device);
1589                 free(path);
1590                 free(options);
1591                 free(options2);
1592                 free(fstype);
1593                 free(d);
1594                 free(p);
1595                 free(o);
1596         }
1597
1598 finish:
1599         free(device);
1600         free(path);
1601         free(options);
1602         free(options2);
1603         free(fstype);
1604         free(d);
1605         free(p);
1606         free(o);
1607
1608         return r;
1609 }
1610
1611 static void mount_shutdown(Manager *m) {
1612         assert(m);
1613
1614         if (m->proc_self_mountinfo) {
1615                 fclose(m->proc_self_mountinfo);
1616                 m->proc_self_mountinfo = NULL;
1617         }
1618 }
1619
1620 static int mount_enumerate(Manager *m) {
1621         int r;
1622         struct epoll_event ev;
1623         assert(m);
1624
1625         if (!m->proc_self_mountinfo) {
1626                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1627                         return -errno;
1628
1629                 m->mount_watch.type = WATCH_MOUNT;
1630                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1631
1632                 zero(ev);
1633                 ev.events = EPOLLPRI;
1634                 ev.data.ptr = &m->mount_watch;
1635
1636                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1637                         return -errno;
1638         }
1639
1640         if ((r = mount_load_etc_fstab(m)) < 0)
1641                 goto fail;
1642
1643         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1644                 goto fail;
1645
1646         return 0;
1647
1648 fail:
1649         mount_shutdown(m);
1650         return r;
1651 }
1652
1653 void mount_fd_event(Manager *m, int events) {
1654         Meta *meta;
1655         int r;
1656
1657         assert(m);
1658         assert(events & EPOLLPRI);
1659
1660         /* The manager calls this for every fd event happening on the
1661          * /proc/self/mountinfo file, which informs us about mounting
1662          * table changes */
1663
1664         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1665                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1666
1667                 /* Reset flags, just in case, for later calls */
1668                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1669                         Mount *mount = (Mount*) meta;
1670
1671                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1672                 }
1673
1674                 return;
1675         }
1676
1677         manager_dispatch_load_queue(m);
1678
1679         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1680                 Mount *mount = (Mount*) meta;
1681
1682                 if (!mount->is_mounted) {
1683                         /* This has just been unmounted. */
1684
1685                         mount->from_proc_self_mountinfo = false;
1686
1687                         switch (mount->state) {
1688
1689                         case MOUNT_MOUNTED:
1690                                 mount_enter_dead(mount, true);
1691                                 break;
1692
1693                         default:
1694                                 mount_set_state(mount, mount->state);
1695                                 break;
1696
1697                         }
1698
1699                 } else if (mount->just_mounted || mount->just_changed) {
1700
1701                         /* New or changed mount entry */
1702
1703                         switch (mount->state) {
1704
1705                         case MOUNT_DEAD:
1706                         case MOUNT_FAILED:
1707                                 mount_enter_mounted(mount, true);
1708                                 break;
1709
1710                         case MOUNT_MOUNTING:
1711                                 mount_enter_mounting_done(mount);
1712                                 break;
1713
1714                         default:
1715                                 /* Nothing really changed, but let's
1716                                  * issue an notification call
1717                                  * nonetheless, in case somebody is
1718                                  * waiting for this. (e.g. file system
1719                                  * ro/rw remounts.) */
1720                                 mount_set_state(mount, mount->state);
1721                                 break;
1722                         }
1723                 }
1724
1725                 /* Reset the flags for later calls */
1726                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1727         }
1728 }
1729
1730 static void mount_reset_failed(Unit *u) {
1731         Mount *m = MOUNT(u);
1732
1733         assert(m);
1734
1735         if (m->state == MOUNT_FAILED)
1736                 mount_set_state(m, MOUNT_DEAD);
1737
1738         m->failure = false;
1739 }
1740
1741 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1742         Mount *m = MOUNT(u);
1743         int r = 0;
1744         Set *pid_set = NULL;
1745
1746         assert(m);
1747
1748         if (who == KILL_MAIN) {
1749                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1750                 return -EINVAL;
1751         }
1752
1753         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1754                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1755                 return -ENOENT;
1756         }
1757
1758         if (m->control_pid > 0)
1759                 if (kill(m->control_pid, signo) < 0)
1760                         r = -errno;
1761
1762         if (mode == KILL_CONTROL_GROUP) {
1763                 int q;
1764
1765                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1766                         return -ENOMEM;
1767
1768                 /* Exclude the control pid from being killed via the cgroup */
1769                 if (m->control_pid > 0)
1770                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1771                                 r = q;
1772                                 goto finish;
1773                         }
1774
1775                 if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0)
1776                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1777                                 r = q;
1778         }
1779
1780 finish:
1781         if (pid_set)
1782                 set_free(pid_set);
1783
1784         return r;
1785 }
1786
1787 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1788         [MOUNT_DEAD] = "dead",
1789         [MOUNT_MOUNTING] = "mounting",
1790         [MOUNT_MOUNTING_DONE] = "mounting-done",
1791         [MOUNT_MOUNTED] = "mounted",
1792         [MOUNT_REMOUNTING] = "remounting",
1793         [MOUNT_UNMOUNTING] = "unmounting",
1794         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1795         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1796         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1797         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1798         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1799         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1800         [MOUNT_FAILED] = "failed"
1801 };
1802
1803 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1804
1805 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1806         [MOUNT_EXEC_MOUNT] = "ExecMount",
1807         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1808         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1809 };
1810
1811 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1812
1813 const UnitVTable mount_vtable = {
1814         .suffix = ".mount",
1815
1816         .no_alias = true,
1817         .no_instances = true,
1818         .show_status = true,
1819
1820         .init = mount_init,
1821         .load = mount_load,
1822         .done = mount_done,
1823
1824         .coldplug = mount_coldplug,
1825
1826         .dump = mount_dump,
1827
1828         .start = mount_start,
1829         .stop = mount_stop,
1830         .reload = mount_reload,
1831
1832         .kill = mount_kill,
1833
1834         .serialize = mount_serialize,
1835         .deserialize_item = mount_deserialize_item,
1836
1837         .active_state = mount_active_state,
1838         .sub_state_to_string = mount_sub_state_to_string,
1839
1840         .check_gc = mount_check_gc,
1841
1842         .sigchld_event = mount_sigchld_event,
1843         .timer_event = mount_timer_event,
1844
1845         .reset_failed = mount_reset_failed,
1846
1847         .bus_interface = "org.freedesktop.systemd1.Mount",
1848         .bus_message_handler = bus_mount_message_handler,
1849         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1850
1851         .enumerate = mount_enumerate,
1852         .shutdown = mount_shutdown
1853 };