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
  39 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  40         [MOUNT_DEAD] = UNIT_INACTIVE,
  41         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  42         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  43         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  44         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  45         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  46         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  47         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  48         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  49         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  50         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  51         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  52         [MOUNT_FAILED] = UNIT_FAILED
  53 };
  54
  55 static void mount_init(Unit *u) {
  56         Mount *m = MOUNT(u);
  57
  58         assert(u);
  59         assert(u->meta.load_state == UNIT_STUB);
  60
  61         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  62         m->directory_mode = 0755;
  63
  64         exec_context_init(&m->exec_context);
  65
  66         /* We need to make sure that /bin/mount is always called in
  67          * the same process group as us, so that the autofs kernel
  68          * side doesn't send us another mount request while we are
  69          * already trying to comply its last one. */
  70         m->exec_context.same_pgrp = true;
  71
  72         m->timer_watch.type = WATCH_INVALID;
  73
  74         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  75 }
  76
  77 static void mount_unwatch_control_pid(Mount *m) {
  78         assert(m);
  79
  80         if (m->control_pid <= 0)
  81                 return;
  82
  83         unit_unwatch_pid(UNIT(m), m->control_pid);
  84         m->control_pid = 0;
  85 }
  86
  87 static void mount_parameters_done(MountParameters *p) {
  88         assert(p);
  89
  90         free(p->what);
  91         free(p->options);
  92         free(p->fstype);
  93
  94         p->what = p->options = p->fstype = NULL;
  95 }
  96
  97 static void mount_done(Unit *u) {
  98         Mount *m = MOUNT(u);
  99
 100         assert(m);
 101
 102         free(m->where);
 103         m->where = NULL;
 104
 105         mount_parameters_done(&m->parameters_etc_fstab);
 106         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 107         mount_parameters_done(&m->parameters_fragment);
 108
 109         exec_context_done(&m->exec_context);
 110         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 111         m->control_command = NULL;
 112
 113         mount_unwatch_control_pid(m);
 114
 115         unit_unwatch_timer(u, &m->timer_watch);
 116 }
 117
 118 static int mount_add_mount_links(Mount *m) {
 119         Meta *other;
 120         int r;
 121         MountParameters *pm;
 122
 123         assert(m);
 124
 125         if (m->from_fragment)
 126                 pm = &m->parameters_fragment;
 127         else if (m->from_etc_fstab)
 128                 pm = &m->parameters_etc_fstab;
 129         else
 130                 pm = NULL;
 131
 132         /* Adds in links to other mount points that might lie below or
 133          * above us in the hierarchy */
 134
 135         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) {
 136                 Mount *n = (Mount*) other;
 137                 MountParameters *pn;
 138
 139                 if (n == m)
 140                         continue;
 141
 142                 if (n->meta.load_state != UNIT_LOADED)
 143                         continue;
 144
 145                 if (n->from_fragment)
 146                         pn = &n->parameters_fragment;
 147                 else if (n->from_etc_fstab)
 148                         pn = &n->parameters_etc_fstab;
 149                 else
 150                         pn = NULL;
 151
 152                 if (path_startswith(m->where, n->where)) {
 153
 154                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 155                                 return r;
 156
 157                         if (n->from_etc_fstab || n->from_fragment)
 158                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 159                                         return r;
 160
 161                 } else if (path_startswith(n->where, m->where)) {
 162
 163                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 164                                 return r;
 165
 166                         if (m->from_etc_fstab || m->from_fragment)
 167                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 168                                         return r;
 169
 170                 } else if (pm && path_startswith(pm->what, n->where)) {
 171
 172                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 173                                 return r;
 174
 175                         if (m->from_etc_fstab || m->from_fragment)
 176                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 177                                         return r;
 178
 179                 } else if (pn && path_startswith(pn->what, m->where)) {
 180
 181                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 182                                 return r;
 183
 184                         if (n->from_etc_fstab || n->from_fragment)
 185                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 186                                         return r;
 187                 }
 188         }
 189
 190         return 0;
 191 }
 192
 193 static int mount_add_swap_links(Mount *m) {
 194         Meta *other;
 195         int r;
 196
 197         assert(m);
 198
 199         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP])
 200                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 201                         return r;
 202
 203         return 0;
 204 }
 205
 206 static int mount_add_path_links(Mount *m) {
 207         Meta *other;
 208         int r;
 209
 210         assert(m);
 211
 212         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH])
 213                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 214                         return r;
 215
 216         return 0;
 217 }
 218
 219 static int mount_add_automount_links(Mount *m) {
 220         Meta *other;
 221         int r;
 222
 223         assert(m);
 224
 225         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT])
 226                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 227                         return r;
 228
 229         return 0;
 230 }
 231
 232 static int mount_add_socket_links(Mount *m) {
 233         Meta *other;
 234         int r;
 235
 236         assert(m);
 237
 238         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET])
 239                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 240                         return r;
 241
 242         return 0;
 243 }
 244
 245 static char* mount_test_option(const char *haystack, const char *needle) {
 246         struct mntent me;
 247
 248         assert(needle);
 249
 250         /* Like glibc's hasmntopt(), but works on a string, not a
 251          * struct mntent */
 252
 253         if (!haystack)
 254                 return false;
 255
 256         zero(me);
 257         me.mnt_opts = (char*) haystack;
 258
 259         return hasmntopt(&me, needle);
 260 }
 261
 262 static int mount_add_target_links(Mount *m) {
 263         const char *target, *after = NULL;
 264         MountParameters *p;
 265         Unit *tu;
 266         int r;
 267         bool noauto, handle, automount, user;
 268
 269         assert(m);
 270
 271         if (m->from_fragment)
 272                 p = &m->parameters_fragment;
 273         else if (m->from_etc_fstab)
 274                 p = &m->parameters_etc_fstab;
 275         else
 276                 return 0;
 277
 278         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 279         user = mount_test_option(p->options, "user") || mount_test_option(p->options, "users");
 280         handle = !!mount_test_option(p->options, "comment=systemd.mount") ||
 281                 m->meta.manager->mount_auto;
 282         automount = !!mount_test_option(p->options, "comment=systemd.automount");
 283
 284         if (mount_test_option(p->options, "_netdev") ||
 285             (p->fstype && fstype_is_network(p->fstype))) {
 286                 target = SPECIAL_REMOTE_FS_TARGET;
 287
 288                 if (m->meta.manager->running_as == MANAGER_SYSTEM)
 289                         after = SPECIAL_NETWORK_TARGET;
 290         } else
 291                 target = SPECIAL_LOCAL_FS_TARGET;
 292
 293         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 294                 return r;
 295
 296         if (after)
 297                 if ((r = unit_add_dependency_by_name(tu, UNIT_AFTER, after, NULL, true)) < 0)
 298                         return r;
 299
 300         if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) {
 301                 Unit *am;
 302
 303                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 304                         return r;
 305
 306                 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 307         } else {
 308
 309                 /* Automatically add mount points that aren't natively
 310                  * configured to local-fs.target */
 311                 if (!noauto &&
 312                     handle &&
 313                     !m->from_fragment)
 314                         if (user || m->meta.manager->running_as == MANAGER_SYSTEM)
 315                                 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 316                                         return r;
 317
 318                 return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true);
 319         }
 320 }
 321
 322 static bool mount_is_bind(MountParameters *p) {
 323         assert(p);
 324
 325         if (p->fstype && streq(p->fstype, "bind"))
 326                 return true;
 327
 328         if (mount_test_option(p->options, "bind"))
 329                 return true;
 330
 331         return false;
 332 }
 333
 334 static int mount_add_device_links(Mount *m) {
 335         MountParameters *p;
 336         int r;
 337
 338         assert(m);
 339
 340         if (m->from_fragment)
 341                 p = &m->parameters_fragment;
 342         else if (m->from_etc_fstab)
 343                 p = &m->parameters_etc_fstab;
 344         else
 345                 return 0;
 346
 347         if (!p->what)
 348                 return 0;
 349
 350         if (!mount_is_bind(p) && !path_equal(m->where, "/")) {
 351                 bool nofail, noauto;
 352
 353                 noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 354                 nofail = !!mount_test_option(p->options, "nofail");
 355
 356                 if ((r = unit_add_node_link(UNIT(m), p->what,
 357                                             !noauto && nofail &&
 358                                             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
 359                         return r;
 360         }
 361
 362         if (p->passno > 0 &&
 363             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM) {
 364                 char *name;
 365                 Unit *fsck;
 366                 /* Let's add in the fsck service */
 367
 368                 /* aka SPECIAL_FSCK_SERVICE */
 369                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 370                         return -ENOMEM;
 371
 372                 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
 373                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 374                         free(name);
 375                         return r;
 376                 }
 377
 378                 free(name);
 379
 380                 SERVICE(fsck)->fsck_passno = p->passno;
 381
 382                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_WANTS, fsck, true)) < 0)
 383                         return r;
 384         }
 385
 386         return 0;
 387 }
 388
 389 static int mount_add_default_dependencies(Mount *m) {
 390         int r;
 391
 392         assert(m);
 393
 394         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 395             !path_equal(m->where, "/")) {
 396
 397                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, SPECIAL_QUOTACHECK_TARGET, NULL, true)) < 0)
 398                         return r;
 399
 400                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 401                         return r;
 402         }
 403
 404         return 0;
 405 }
 406
 407 static int mount_verify(Mount *m) {
 408         bool b;
 409         char *e;
 410         assert(m);
 411
 412         if (m->meta.load_state != UNIT_LOADED)
 413                 return 0;
 414
 415         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 416                 return -ENOENT;
 417
 418         if (!(e = unit_name_from_path(m->where, ".mount")))
 419                 return -ENOMEM;
 420
 421         b = unit_has_name(UNIT(m), e);
 422         free(e);
 423
 424         if (!b) {
 425                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 426                 return -EINVAL;
 427         }
 428
 429         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 430                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 431                 return -EBADMSG;
 432         }
 433
 434         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 435                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 436                 return -EINVAL;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int mount_load(Unit *u) {
 443         Mount *m = MOUNT(u);
 444         int r;
 445
 446         assert(u);
 447         assert(u->meta.load_state == UNIT_STUB);
 448
 449         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 450                 return r;
 451
 452         /* This is a new unit? Then let's add in some extras */
 453         if (u->meta.load_state == UNIT_LOADED) {
 454                 if (m->meta.fragment_path)
 455                         m->from_fragment = true;
 456
 457                 if (!m->where)
 458                         if (!(m->where = unit_name_to_path(u->meta.id)))
 459                                 return -ENOMEM;
 460
 461                 path_kill_slashes(m->where);
 462
 463                 if (!m->meta.description)
 464                         if ((r = unit_set_description(u, m->where)) < 0)
 465                                 return r;
 466
 467                 if ((r = mount_add_device_links(m)) < 0)
 468                         return r;
 469
 470                 if ((r = mount_add_mount_links(m)) < 0)
 471                         return r;
 472
 473                 if ((r = mount_add_socket_links(m)) < 0)
 474                         return r;
 475
 476                 if ((r = mount_add_swap_links(m)) < 0)
 477                         return r;
 478
 479                 if ((r = mount_add_path_links(m)) < 0)
 480                         return r;
 481
 482                 if ((r = mount_add_automount_links(m)) < 0)
 483                         return r;
 484
 485                 if ((r = mount_add_target_links(m)) < 0)
 486                         return r;
 487
 488                 if ((r = unit_add_default_cgroup(u)) < 0)
 489                         return r;
 490
 491                 if (m->meta.default_dependencies)
 492                         if ((r = mount_add_default_dependencies(m)) < 0)
 493                                 return r;
 494         }
 495
 496         return mount_verify(m);
 497 }
 498
 499 static int mount_notify_automount(Mount *m, int status) {
 500         Unit *p;
 501         int r;
 502
 503         assert(m);
 504
 505         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 506                 return r == -ENOENT ? 0 : r;
 507
 508         return automount_send_ready(AUTOMOUNT(p), status);
 509 }
 510
 511 static void mount_set_state(Mount *m, MountState state) {
 512         MountState old_state;
 513         assert(m);
 514
 515         old_state = m->state;
 516         m->state = state;
 517
 518         if (state != MOUNT_MOUNTING &&
 519             state != MOUNT_MOUNTING_DONE &&
 520             state != MOUNT_REMOUNTING &&
 521             state != MOUNT_UNMOUNTING &&
 522             state != MOUNT_MOUNTING_SIGTERM &&
 523             state != MOUNT_MOUNTING_SIGKILL &&
 524             state != MOUNT_UNMOUNTING_SIGTERM &&
 525             state != MOUNT_UNMOUNTING_SIGKILL &&
 526             state != MOUNT_REMOUNTING_SIGTERM &&
 527             state != MOUNT_REMOUNTING_SIGKILL) {
 528                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 529                 mount_unwatch_control_pid(m);
 530                 m->control_command = NULL;
 531                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 532         }
 533
 534         if (state == MOUNT_MOUNTED ||
 535             state == MOUNT_REMOUNTING)
 536                 mount_notify_automount(m, 0);
 537         else if (state == MOUNT_DEAD ||
 538                  state == MOUNT_UNMOUNTING ||
 539                  state == MOUNT_MOUNTING_SIGTERM ||
 540                  state == MOUNT_MOUNTING_SIGKILL ||
 541                  state == MOUNT_REMOUNTING_SIGTERM ||
 542                  state == MOUNT_REMOUNTING_SIGKILL ||
 543                  state == MOUNT_UNMOUNTING_SIGTERM ||
 544                  state == MOUNT_UNMOUNTING_SIGKILL ||
 545                  state == MOUNT_FAILED)
 546                 mount_notify_automount(m, -ENODEV);
 547
 548         if (state != old_state)
 549                 log_debug("%s changed %s -> %s",
 550                           m->meta.id,
 551                           mount_state_to_string(old_state),
 552                           mount_state_to_string(state));
 553
 554         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 555 }
 556
 557 static int mount_coldplug(Unit *u) {
 558         Mount *m = MOUNT(u);
 559         MountState new_state = MOUNT_DEAD;
 560         int r;
 561
 562         assert(m);
 563         assert(m->state == MOUNT_DEAD);
 564
 565         if (m->deserialized_state != m->state)
 566                 new_state = m->deserialized_state;
 567         else if (m->from_proc_self_mountinfo)
 568                 new_state = MOUNT_MOUNTED;
 569
 570         if (new_state != m->state) {
 571
 572                 if (new_state == MOUNT_MOUNTING ||
 573                     new_state == MOUNT_MOUNTING_DONE ||
 574                     new_state == MOUNT_REMOUNTING ||
 575                     new_state == MOUNT_UNMOUNTING ||
 576                     new_state == MOUNT_MOUNTING_SIGTERM ||
 577                     new_state == MOUNT_MOUNTING_SIGKILL ||
 578                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 579                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 580                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 581                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 582
 583                         if (m->control_pid <= 0)
 584                                 return -EBADMSG;
 585
 586                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 587                                 return r;
 588
 589                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 590                                 return r;
 591                 }
 592
 593                 mount_set_state(m, new_state);
 594         }
 595
 596         return 0;
 597 }
 598
 599 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 600         Mount *m = MOUNT(u);
 601         MountParameters *p;
 602
 603         assert(m);
 604         assert(f);
 605
 606         if (m->from_proc_self_mountinfo)
 607                 p = &m->parameters_proc_self_mountinfo;
 608         else if (m->from_fragment)
 609                 p = &m->parameters_fragment;
 610         else
 611                 p = &m->parameters_etc_fstab;
 612
 613         fprintf(f,
 614                 "%sMount State: %s\n"
 615                 "%sWhere: %s\n"
 616                 "%sWhat: %s\n"
 617                 "%sFile System Type: %s\n"
 618                 "%sOptions: %s\n"
 619                 "%sFrom /etc/fstab: %s\n"
 620                 "%sFrom /proc/self/mountinfo: %s\n"
 621                 "%sFrom fragment: %s\n"
 622                 "%sDirectoryMode: %04o\n",
 623                 prefix, mount_state_to_string(m->state),
 624                 prefix, m->where,
 625                 prefix, strna(p->what),
 626                 prefix, strna(p->fstype),
 627                 prefix, strna(p->options),
 628                 prefix, yes_no(m->from_etc_fstab),
 629                 prefix, yes_no(m->from_proc_self_mountinfo),
 630                 prefix, yes_no(m->from_fragment),
 631                 prefix, m->directory_mode);
 632
 633         if (m->control_pid > 0)
 634                 fprintf(f,
 635                         "%sControl PID: %lu\n",
 636                         prefix, (unsigned long) m->control_pid);
 637
 638         exec_context_dump(&m->exec_context, f, prefix);
 639 }
 640
 641 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 642         pid_t pid;
 643         int r;
 644
 645         assert(m);
 646         assert(c);
 647         assert(_pid);
 648
 649         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 650                 goto fail;
 651
 652         if ((r = exec_spawn(c,
 653                             NULL,
 654                             &m->exec_context,
 655                             NULL, 0,
 656                             m->meta.manager->environment,
 657                             true,
 658                             true,
 659                             true,
 660                             m->meta.manager->confirm_spawn,
 661                             m->meta.cgroup_bondings,
 662                             &pid)) < 0)
 663                 goto fail;
 664
 665         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 666                 /* FIXME: we need to do something here */
 667                 goto fail;
 668
 669         *_pid = pid;
 670
 671         return 0;
 672
 673 fail:
 674         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 675
 676         return r;
 677 }
 678
 679 static void mount_enter_dead(Mount *m, bool success) {
 680         assert(m);
 681
 682         if (!success)
 683                 m->failure = true;
 684
 685         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 686 }
 687
 688 static void mount_enter_mounted(Mount *m, bool success) {
 689         assert(m);
 690
 691         if (!success)
 692                 m->failure = true;
 693
 694         mount_set_state(m, MOUNT_MOUNTED);
 695 }
 696
 697 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 698         int r;
 699         Set *pid_set = NULL;
 700         bool wait_for_exit = false;
 701
 702         assert(m);
 703
 704         if (!success)
 705                 m->failure = true;
 706
 707         if (m->exec_context.kill_mode != KILL_NONE) {
 708                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 709                            state == MOUNT_UNMOUNTING_SIGTERM ||
 710                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 711
 712                 if (m->control_pid > 0) {
 713                         if (kill(m->exec_context.kill_mode == KILL_PROCESS_GROUP ?
 714                                  -m->control_pid :
 715                                  m->control_pid, sig) < 0 && errno != ESRCH)
 716
 717                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 718                         else
 719                                 wait_for_exit = true;
 720                 }
 721
 722                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 723
 724                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 725                                 r = -ENOMEM;
 726                                 goto fail;
 727                         }
 728
 729                         /* Exclude the control pid from being killed via the cgroup */
 730                         if (m->control_pid > 0)
 731                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 732                                         goto fail;
 733
 734                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, pid_set)) < 0) {
 735                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 736                                         log_warning("Failed to kill control group: %s", strerror(-r));
 737                         } else if (r > 0)
 738                                 wait_for_exit = true;
 739
 740                         set_free(pid_set);
 741                 }
 742         }
 743
 744         if (wait_for_exit) {
 745                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 746                         goto fail;
 747
 748                 mount_set_state(m, state);
 749         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 750                 mount_enter_mounted(m, true);
 751         else
 752                 mount_enter_dead(m, true);
 753
 754         return;
 755
 756 fail:
 757         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 758
 759         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 760                 mount_enter_mounted(m, false);
 761         else
 762                 mount_enter_dead(m, false);
 763
 764         if (pid_set)
 765                 set_free(pid_set);
 766 }
 767
 768 static void mount_enter_unmounting(Mount *m, bool success) {
 769         int r;
 770
 771         assert(m);
 772
 773         if (!success)
 774                 m->failure = true;
 775
 776         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 777         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 778
 779         if ((r = exec_command_set(
 780                              m->control_command,
 781                              "/bin/umount",
 782                              m->where,
 783                              NULL)) < 0)
 784                 goto fail;
 785
 786         mount_unwatch_control_pid(m);
 787
 788         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 789                 goto fail;
 790
 791         mount_set_state(m, MOUNT_UNMOUNTING);
 792
 793         return;
 794
 795 fail:
 796         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 797         mount_enter_mounted(m, false);
 798 }
 799
 800 static void mount_enter_mounting(Mount *m) {
 801         int r;
 802
 803         assert(m);
 804
 805         m->control_command_id = MOUNT_EXEC_MOUNT;
 806         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 807
 808         mkdir_p(m->where, m->directory_mode);
 809
 810         if (m->from_fragment)
 811                 r = exec_command_set(
 812                                 m->control_command,
 813                                 "/bin/mount",
 814                                 m->parameters_fragment.what,
 815                                 m->where,
 816                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 817                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 818                                 NULL);
 819         else if (m->from_etc_fstab)
 820                 r = exec_command_set(
 821                                 m->control_command,
 822                                 "/bin/mount",
 823                                 m->where,
 824                                 NULL);
 825         else
 826                 r = -ENOENT;
 827
 828         if (r < 0)
 829                 goto fail;
 830
 831         mount_unwatch_control_pid(m);
 832
 833         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 834                 goto fail;
 835
 836         mount_set_state(m, MOUNT_MOUNTING);
 837
 838         return;
 839
 840 fail:
 841         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 842         mount_enter_dead(m, false);
 843 }
 844
 845 static void mount_enter_mounting_done(Mount *m) {
 846         assert(m);
 847
 848         mount_set_state(m, MOUNT_MOUNTING_DONE);
 849 }
 850
 851 static void mount_enter_remounting(Mount *m, bool success) {
 852         int r;
 853
 854         assert(m);
 855
 856         if (!success)
 857                 m->failure = true;
 858
 859         m->control_command_id = MOUNT_EXEC_REMOUNT;
 860         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 861
 862         if (m->from_fragment) {
 863                 char *buf = NULL;
 864                 const char *o;
 865
 866                 if (m->parameters_fragment.options) {
 867                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 868                                 r = -ENOMEM;
 869                                 goto fail;
 870                         }
 871
 872                         o = buf;
 873                 } else
 874                         o = "remount";
 875
 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                                 "-o", o,
 883                                 NULL);
 884
 885                 free(buf);
 886         } else if (m->from_etc_fstab)
 887                 r = exec_command_set(
 888                                 m->control_command,
 889                                 "/bin/mount",
 890                                 m->where,
 891                                 "-o", "remount",
 892                                 NULL);
 893         else
 894                 r = -ENOENT;
 895
 896         if (r < 0)
 897                 goto fail;
 898
 899         mount_unwatch_control_pid(m);
 900
 901         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 902                 goto fail;
 903
 904         mount_set_state(m, MOUNT_REMOUNTING);
 905
 906         return;
 907
 908 fail:
 909         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 910         mount_enter_mounted(m, false);
 911 }
 912
 913 static int mount_start(Unit *u) {
 914         Mount *m = MOUNT(u);
 915
 916         assert(m);
 917
 918         /* We cannot fulfill this request right now, try again later
 919          * please! */
 920         if (m->state == MOUNT_UNMOUNTING ||
 921             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 922             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 923             m->state == MOUNT_MOUNTING_SIGTERM ||
 924             m->state == MOUNT_MOUNTING_SIGKILL)
 925                 return -EAGAIN;
 926
 927         /* Already on it! */
 928         if (m->state == MOUNT_MOUNTING)
 929                 return 0;
 930
 931         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
 932
 933         m->failure = false;
 934         mount_enter_mounting(m);
 935         return 0;
 936 }
 937
 938 static int mount_stop(Unit *u) {
 939         Mount *m = MOUNT(u);
 940
 941         assert(m);
 942
 943         /* Already on it */
 944         if (m->state == MOUNT_UNMOUNTING ||
 945             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 946             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 947             m->state == MOUNT_MOUNTING_SIGTERM ||
 948             m->state == MOUNT_MOUNTING_SIGKILL)
 949                 return 0;
 950
 951         assert(m->state == MOUNT_MOUNTING ||
 952                m->state == MOUNT_MOUNTING_DONE ||
 953                m->state == MOUNT_MOUNTED ||
 954                m->state == MOUNT_REMOUNTING ||
 955                m->state == MOUNT_REMOUNTING_SIGTERM ||
 956                m->state == MOUNT_REMOUNTING_SIGKILL);
 957
 958         mount_enter_unmounting(m, true);
 959         return 0;
 960 }
 961
 962 static int mount_reload(Unit *u) {
 963         Mount *m = MOUNT(u);
 964
 965         assert(m);
 966
 967         if (m->state == MOUNT_MOUNTING_DONE)
 968                 return -EAGAIN;
 969
 970         assert(m->state == MOUNT_MOUNTED);
 971
 972         mount_enter_remounting(m, true);
 973         return 0;
 974 }
 975
 976 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
 977         Mount *m = MOUNT(u);
 978
 979         assert(m);
 980         assert(f);
 981         assert(fds);
 982
 983         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
 984         unit_serialize_item(u, f, "failure", yes_no(m->failure));
 985
 986         if (m->control_pid > 0)
 987                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
 988
 989         if (m->control_command_id >= 0)
 990                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
 991
 992         return 0;
 993 }
 994
 995 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 996         Mount *m = MOUNT(u);
 997
 998         assert(u);
 999         assert(key);
1000         assert(value);
1001         assert(fds);
1002
1003         if (streq(key, "state")) {
1004                 MountState state;
1005
1006                 if ((state = mount_state_from_string(value)) < 0)
1007                         log_debug("Failed to parse state value %s", value);
1008                 else
1009                         m->deserialized_state = state;
1010         } else if (streq(key, "failure")) {
1011                 int b;
1012
1013                 if ((b = parse_boolean(value)) < 0)
1014                         log_debug("Failed to parse failure value %s", value);
1015                 else
1016                         m->failure = b || m->failure;
1017
1018         } else if (streq(key, "control-pid")) {
1019                 pid_t pid;
1020
1021                 if (parse_pid(value, &pid) < 0)
1022                         log_debug("Failed to parse control-pid value %s", value);
1023                 else
1024                         m->control_pid = pid;
1025         } else if (streq(key, "control-command")) {
1026                 MountExecCommand id;
1027
1028                 if ((id = mount_exec_command_from_string(value)) < 0)
1029                         log_debug("Failed to parse exec-command value %s", value);
1030                 else {
1031                         m->control_command_id = id;
1032                         m->control_command = m->exec_command + id;
1033                 }
1034
1035         } else
1036                 log_debug("Unknown serialization key '%s'", key);
1037
1038         return 0;
1039 }
1040
1041 static UnitActiveState mount_active_state(Unit *u) {
1042         assert(u);
1043
1044         return state_translation_table[MOUNT(u)->state];
1045 }
1046
1047 static const char *mount_sub_state_to_string(Unit *u) {
1048         assert(u);
1049
1050         return mount_state_to_string(MOUNT(u)->state);
1051 }
1052
1053 static bool mount_check_gc(Unit *u) {
1054         Mount *m = MOUNT(u);
1055
1056         assert(m);
1057
1058         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1059 }
1060
1061 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1062         Mount *m = MOUNT(u);
1063         bool success;
1064
1065         assert(m);
1066         assert(pid >= 0);
1067
1068         if (pid != m->control_pid)
1069                 return;
1070
1071         m->control_pid = 0;
1072
1073         success = is_clean_exit(code, status);
1074         m->failure = m->failure || !success;
1075
1076         if (m->control_command) {
1077                 exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id);
1078                 m->control_command = NULL;
1079                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1080         }
1081
1082         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1083                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1084
1085         /* Note that mount(8) returning and the kernel sending us a
1086          * mount table change event might happen out-of-order. If an
1087          * operation succeed we assume the kernel will follow soon too
1088          * and already change into the resulting state.  If it fails
1089          * we check if the kernel still knows about the mount. and
1090          * change state accordingly. */
1091
1092         switch (m->state) {
1093
1094         case MOUNT_MOUNTING:
1095         case MOUNT_MOUNTING_DONE:
1096         case MOUNT_MOUNTING_SIGKILL:
1097         case MOUNT_MOUNTING_SIGTERM:
1098         case MOUNT_REMOUNTING:
1099         case MOUNT_REMOUNTING_SIGKILL:
1100         case MOUNT_REMOUNTING_SIGTERM:
1101
1102                 if (success)
1103                         mount_enter_mounted(m, true);
1104                 else if (m->from_proc_self_mountinfo)
1105                         mount_enter_mounted(m, false);
1106                 else
1107                         mount_enter_dead(m, false);
1108                 break;
1109
1110         case MOUNT_UNMOUNTING:
1111         case MOUNT_UNMOUNTING_SIGKILL:
1112         case MOUNT_UNMOUNTING_SIGTERM:
1113
1114                 if (success)
1115                         mount_enter_dead(m, true);
1116                 else if (m->from_proc_self_mountinfo)
1117                         mount_enter_mounted(m, false);
1118                 else
1119                         mount_enter_dead(m, false);
1120                 break;
1121
1122         default:
1123                 assert_not_reached("Uh, control process died at wrong time.");
1124         }
1125
1126         /* Notify clients about changed exit status */
1127         unit_add_to_dbus_queue(u);
1128 }
1129
1130 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1131         Mount *m = MOUNT(u);
1132
1133         assert(m);
1134         assert(elapsed == 1);
1135         assert(w == &m->timer_watch);
1136
1137         switch (m->state) {
1138
1139         case MOUNT_MOUNTING:
1140         case MOUNT_MOUNTING_DONE:
1141                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1142                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1143                 break;
1144
1145         case MOUNT_REMOUNTING:
1146                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1147                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
1148                 break;
1149
1150         case MOUNT_UNMOUNTING:
1151                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1152                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1153                 break;
1154
1155         case MOUNT_MOUNTING_SIGTERM:
1156                 log_warning("%s mounting timed out. Killing.", u->meta.id);
1157                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1158                 break;
1159
1160         case MOUNT_REMOUNTING_SIGTERM:
1161                 log_warning("%s remounting timed out. Killing.", u->meta.id);
1162                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1163                 break;
1164
1165         case MOUNT_UNMOUNTING_SIGTERM:
1166                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
1167                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1168                 break;
1169
1170         case MOUNT_MOUNTING_SIGKILL:
1171         case MOUNT_REMOUNTING_SIGKILL:
1172         case MOUNT_UNMOUNTING_SIGKILL:
1173                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1174
1175                 if (m->from_proc_self_mountinfo)
1176                         mount_enter_mounted(m, false);
1177                 else
1178                         mount_enter_dead(m, false);
1179                 break;
1180
1181         default:
1182                 assert_not_reached("Timeout at wrong time.");
1183         }
1184 }
1185
1186 static int mount_add_one(
1187                 Manager *m,
1188                 const char *what,
1189                 const char *where,
1190                 const char *options,
1191                 const char *fstype,
1192                 int passno,
1193                 bool from_proc_self_mountinfo,
1194                 bool set_flags) {
1195         int r;
1196         Unit *u;
1197         bool delete;
1198         char *e, *w = NULL, *o = NULL, *f = NULL;
1199         MountParameters *p;
1200
1201         assert(m);
1202         assert(what);
1203         assert(where);
1204         assert(options);
1205         assert(fstype);
1206
1207         assert(!set_flags || from_proc_self_mountinfo);
1208
1209         /* Ignore API mount points. They should never be referenced in
1210          * dependencies ever. */
1211         if (mount_point_is_api(where))
1212                 return 0;
1213
1214         if (streq(fstype, "autofs"))
1215                 return 0;
1216
1217         /* probably some kind of swap, ignore */
1218         if (!is_path(where))
1219                 return 0;
1220
1221         if (!(e = unit_name_from_path(where, ".mount")))
1222                 return -ENOMEM;
1223
1224         if (!(u = manager_get_unit(m, e))) {
1225                 delete = true;
1226
1227                 if (!(u = unit_new(m))) {
1228                         free(e);
1229                         return -ENOMEM;
1230                 }
1231
1232                 r = unit_add_name(u, e);
1233                 free(e);
1234
1235                 if (r < 0)
1236                         goto fail;
1237
1238                 if (!(MOUNT(u)->where = strdup(where))) {
1239                         r = -ENOMEM;
1240                         goto fail;
1241                 }
1242
1243                 unit_add_to_load_queue(u);
1244         } else {
1245                 delete = false;
1246                 free(e);
1247         }
1248
1249         if (!(w = strdup(what)) ||
1250             !(o = strdup(options)) ||
1251             !(f = strdup(fstype))) {
1252                 r = -ENOMEM;
1253                 goto fail;
1254         }
1255
1256         if (from_proc_self_mountinfo) {
1257                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1258
1259                 if (set_flags) {
1260                         MOUNT(u)->is_mounted = true;
1261                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1262                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1263                 }
1264
1265                 MOUNT(u)->from_proc_self_mountinfo = true;
1266         } else {
1267                 p = &MOUNT(u)->parameters_etc_fstab;
1268                 MOUNT(u)->from_etc_fstab = true;
1269         }
1270
1271         free(p->what);
1272         p->what = w;
1273
1274         free(p->options);
1275         p->options = o;
1276
1277         free(p->fstype);
1278         p->fstype = f;
1279
1280         p->passno = passno;
1281
1282         unit_add_to_dbus_queue(u);
1283
1284         return 0;
1285
1286 fail:
1287         free(w);
1288         free(o);
1289         free(f);
1290
1291         if (delete && u)
1292                 unit_free(u);
1293
1294         return r;
1295 }
1296
1297 static char *fstab_node_to_udev_node(char *p) {
1298         char *dn, *t, *u;
1299         int r;
1300
1301         /* FIXME: to follow udev's logic 100% we need to leave valid
1302          * UTF8 chars unescaped */
1303
1304         if (startswith(p, "LABEL=")) {
1305
1306                 if (!(u = unquote(p+6, "\"\'")))
1307                         return NULL;
1308
1309                 t = xescape(u, "/ ");
1310                 free(u);
1311
1312                 if (!t)
1313                         return NULL;
1314
1315                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
1316                 free(t);
1317
1318                 if (r < 0)
1319                         return NULL;
1320
1321                 return dn;
1322         }
1323
1324         if (startswith(p, "UUID=")) {
1325
1326                 if (!(u = unquote(p+5, "\"\'")))
1327                         return NULL;
1328
1329                 t = xescape(u, "/ ");
1330                 free(u);
1331
1332                 if (!t)
1333                         return NULL;
1334
1335                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
1336                 free(t);
1337
1338                 if (r < 0)
1339                         return NULL;
1340
1341                 return dn;
1342         }
1343
1344         return strdup(p);
1345 }
1346
1347 static int mount_find_pri(char *options) {
1348         char *end, *pri;
1349         unsigned long r;
1350
1351         if (!(pri = mount_test_option(options, "pri=")))
1352                 return 0;
1353
1354         pri += 4;
1355
1356         errno = 0;
1357         r = strtoul(pri, &end, 10);
1358
1359         if (errno != 0)
1360                 return -errno;
1361
1362         if (end == pri || (*end != ',' && *end != 0))
1363                 return -EINVAL;
1364
1365         return (int) r;
1366 }
1367
1368 static int mount_load_etc_fstab(Manager *m) {
1369         FILE *f;
1370         int r = 0;
1371         struct mntent* me;
1372
1373         assert(m);
1374
1375         errno = 0;
1376         if (!(f = setmntent("/etc/fstab", "r")))
1377                 return -errno;
1378
1379         while ((me = getmntent(f))) {
1380                 char *where, *what;
1381                 int k;
1382
1383                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1384                         r = -ENOMEM;
1385                         goto finish;
1386                 }
1387
1388                 if (!(where = strdup(me->mnt_dir))) {
1389                         free(what);
1390                         r = -ENOMEM;
1391                         goto finish;
1392                 }
1393
1394                 if (what[0] == '/')
1395                         path_kill_slashes(what);
1396
1397                 if (where[0] == '/')
1398                         path_kill_slashes(where);
1399
1400                 if (streq(me->mnt_type, "swap")) {
1401                         int pri;
1402
1403                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1404                                 k = pri;
1405                         else
1406                                 k = swap_add_one(m,
1407                                                  what,
1408                                                  NULL,
1409                                                  pri,
1410                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1411                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1412                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1413                                                  false);
1414                 } else
1415                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1416
1417                 free(what);
1418                 free(where);
1419
1420                 if (r < 0)
1421                         r = k;
1422         }
1423
1424 finish:
1425
1426         endmntent(f);
1427         return r;
1428 }
1429
1430 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1431         int r = 0;
1432         unsigned i;
1433         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1434
1435         assert(m);
1436
1437         rewind(m->proc_self_mountinfo);
1438
1439         for (i = 1;; i++) {
1440                 int k;
1441
1442                 device = path = options = options2 = fstype = d = p = o = NULL;
1443
1444                 if ((k = fscanf(m->proc_self_mountinfo,
1445                                 "%*s "       /* (1) mount id */
1446                                 "%*s "       /* (2) parent id */
1447                                 "%*s "       /* (3) major:minor */
1448                                 "%*s "       /* (4) root */
1449                                 "%ms "       /* (5) mount point */
1450                                 "%ms"        /* (6) mount options */
1451                                 "%*[^-]"     /* (7) optional fields */
1452                                 "- "         /* (8) separator */
1453                                 "%ms "       /* (9) file system type */
1454                                 "%ms"        /* (10) mount source */
1455                                 "%ms"        /* (11) mount options 2 */
1456                                 "%*[^\n]",   /* some rubbish at the end */
1457                                 &path,
1458                                 &options,
1459                                 &fstype,
1460                                 &device,
1461                                 &options2)) != 5) {
1462
1463                         if (k == EOF)
1464                                 break;
1465
1466                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1467                         goto clean_up;
1468                 }
1469
1470                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1471                         r = -ENOMEM;
1472                         goto finish;
1473                 }
1474
1475                 if (!(d = cunescape(device)) ||
1476                     !(p = cunescape(path))) {
1477                         r = -ENOMEM;
1478                         goto finish;
1479                 }
1480
1481                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1482                         r = k;
1483
1484 clean_up:
1485                 free(device);
1486                 free(path);
1487                 free(options);
1488                 free(options2);
1489                 free(fstype);
1490                 free(d);
1491                 free(p);
1492                 free(o);
1493         }
1494
1495 finish:
1496         free(device);
1497         free(path);
1498         free(options);
1499         free(options2);
1500         free(fstype);
1501         free(d);
1502         free(p);
1503         free(o);
1504
1505         return r;
1506 }
1507
1508 static void mount_shutdown(Manager *m) {
1509         assert(m);
1510
1511         if (m->proc_self_mountinfo) {
1512                 fclose(m->proc_self_mountinfo);
1513                 m->proc_self_mountinfo = NULL;
1514         }
1515 }
1516
1517 static int mount_enumerate(Manager *m) {
1518         int r;
1519         struct epoll_event ev;
1520         assert(m);
1521
1522         if (!m->proc_self_mountinfo) {
1523                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1524                         return -errno;
1525
1526                 m->mount_watch.type = WATCH_MOUNT;
1527                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1528
1529                 zero(ev);
1530                 ev.events = EPOLLPRI;
1531                 ev.data.ptr = &m->mount_watch;
1532
1533                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1534                         return -errno;
1535         }
1536
1537         if ((r = mount_load_etc_fstab(m)) < 0)
1538                 goto fail;
1539
1540         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1541                 goto fail;
1542
1543         return 0;
1544
1545 fail:
1546         mount_shutdown(m);
1547         return r;
1548 }
1549
1550 void mount_fd_event(Manager *m, int events) {
1551         Meta *meta;
1552         int r;
1553
1554         assert(m);
1555         assert(events & EPOLLPRI);
1556
1557         /* The manager calls this for every fd event happening on the
1558          * /proc/self/mountinfo file, which informs us about mounting
1559          * table changes */
1560
1561         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1562                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1563
1564                 /* Reset flags, just in case, for later calls */
1565                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1566                         Mount *mount = (Mount*) meta;
1567
1568                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1569                 }
1570
1571                 return;
1572         }
1573
1574         manager_dispatch_load_queue(m);
1575
1576         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1577                 Mount *mount = (Mount*) meta;
1578
1579                 if (!mount->is_mounted) {
1580                         /* This has just been unmounted. */
1581
1582                         mount->from_proc_self_mountinfo = false;
1583
1584                         switch (mount->state) {
1585
1586                         case MOUNT_MOUNTED:
1587                                 mount_enter_dead(mount, true);
1588                                 break;
1589
1590                         default:
1591                                 mount_set_state(mount, mount->state);
1592                                 break;
1593
1594                         }
1595
1596                 } else if (mount->just_mounted || mount->just_changed) {
1597
1598                         /* New or changed mount entry */
1599
1600                         switch (mount->state) {
1601
1602                         case MOUNT_DEAD:
1603                         case MOUNT_FAILED:
1604                                 mount_enter_mounted(mount, true);
1605                                 break;
1606
1607                         case MOUNT_MOUNTING:
1608                                 mount_enter_mounting_done(mount);
1609                                 break;
1610
1611                         default:
1612                                 /* Nothing really changed, but let's
1613                                  * issue an notification call
1614                                  * nonetheless, in case somebody is
1615                                  * waiting for this. (e.g. file system
1616                                  * ro/rw remounts.) */
1617                                 mount_set_state(mount, mount->state);
1618                                 break;
1619                         }
1620                 }
1621
1622                 /* Reset the flags for later calls */
1623                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1624         }
1625 }
1626
1627 static void mount_reset_failed(Unit *u) {
1628         Mount *m = MOUNT(u);
1629
1630         assert(m);
1631
1632         if (m->state == MOUNT_FAILED)
1633                 mount_set_state(m, MOUNT_DEAD);
1634
1635         m->failure = false;
1636 }
1637
1638 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1639         [MOUNT_DEAD] = "dead",
1640         [MOUNT_MOUNTING] = "mounting",
1641         [MOUNT_MOUNTING_DONE] = "mounting-done",
1642         [MOUNT_MOUNTED] = "mounted",
1643         [MOUNT_REMOUNTING] = "remounting",
1644         [MOUNT_UNMOUNTING] = "unmounting",
1645         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1646         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1647         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1648         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1649         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1650         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1651         [MOUNT_FAILED] = "failed"
1652 };
1653
1654 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1655
1656 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1657         [MOUNT_EXEC_MOUNT] = "ExecMount",
1658         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1659         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1660 };
1661
1662 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1663
1664 const UnitVTable mount_vtable = {
1665         .suffix = ".mount",
1666
1667         .no_alias = true,
1668         .no_instances = true,
1669         .no_isolate = true,
1670         .show_status = true,
1671
1672         .init = mount_init,
1673         .load = mount_load,
1674         .done = mount_done,
1675
1676         .coldplug = mount_coldplug,
1677
1678         .dump = mount_dump,
1679
1680         .start = mount_start,
1681         .stop = mount_stop,
1682         .reload = mount_reload,
1683
1684         .serialize = mount_serialize,
1685         .deserialize_item = mount_deserialize_item,
1686
1687         .active_state = mount_active_state,
1688         .sub_state_to_string = mount_sub_state_to_string,
1689
1690         .check_gc = mount_check_gc,
1691
1692         .sigchld_event = mount_sigchld_event,
1693         .timer_event = mount_timer_event,
1694
1695         .reset_failed = mount_reset_failed,
1696
1697         .bus_interface = "org.freedesktop.systemd1.Mount",
1698         .bus_message_handler = bus_mount_message_handler,
1699         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1700
1701         .enumerate = mount_enumerate,
1702         .shutdown = mount_shutdown
1703 };