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         bool nofail, noauto;
 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 || path_equal(m->where, "/"))
 348                 return 0;
 349
 350         if (mount_is_bind(p))
 351                 return 0;
 352
 353         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 354         nofail = !!mount_test_option(p->options, "nofail");
 355
 356         return unit_add_node_link(UNIT(m), p->what,
 357                                   !noauto && nofail &&
 358                                   UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM);
 359 }
 360
 361 static int mount_add_default_dependencies(Mount *m) {
 362         int r;
 363
 364         assert(m);
 365
 366         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 367             !path_equal(m->where, "/")) {
 368
 369                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_FSCK_TARGET, NULL, true)) < 0)
 370                         return r;
 371
 372                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 373                         return r;
 374         }
 375
 376         return 0;
 377 }
 378
 379 static int mount_verify(Mount *m) {
 380         bool b;
 381         char *e;
 382         assert(m);
 383
 384         if (m->meta.load_state != UNIT_LOADED)
 385                 return 0;
 386
 387         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 388                 return -ENOENT;
 389
 390         if (!(e = unit_name_from_path(m->where, ".mount")))
 391                 return -ENOMEM;
 392
 393         b = unit_has_name(UNIT(m), e);
 394         free(e);
 395
 396         if (!b) {
 397                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 398                 return -EINVAL;
 399         }
 400
 401         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 402                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 403                 return -EBADMSG;
 404         }
 405
 406         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 407                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 408                 return -EINVAL;
 409         }
 410
 411         return 0;
 412 }
 413
 414 static int mount_load(Unit *u) {
 415         Mount *m = MOUNT(u);
 416         int r;
 417
 418         assert(u);
 419         assert(u->meta.load_state == UNIT_STUB);
 420
 421         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 422                 return r;
 423
 424         /* This is a new unit? Then let's add in some extras */
 425         if (u->meta.load_state == UNIT_LOADED) {
 426                 const char *what = NULL;
 427
 428                 if (m->meta.fragment_path)
 429                         m->from_fragment = true;
 430
 431                 if (!m->where)
 432                         if (!(m->where = unit_name_to_path(u->meta.id)))
 433                                 return -ENOMEM;
 434
 435                 path_kill_slashes(m->where);
 436
 437                 if (!m->meta.description)
 438                         if ((r = unit_set_description(u, m->where)) < 0)
 439                                 return r;
 440
 441                 if (m->from_fragment && m->parameters_fragment.what)
 442                         what = m->parameters_fragment.what;
 443                 else if (m->from_etc_fstab && m->parameters_etc_fstab.what)
 444                         what = m->parameters_etc_fstab.what;
 445                 else if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.what)
 446                         what = m->parameters_proc_self_mountinfo.what;
 447
 448                 if ((r = mount_add_device_links(m)) < 0)
 449                         return r;
 450
 451                 if ((r = mount_add_mount_links(m)) < 0)
 452                         return r;
 453
 454                 if ((r = mount_add_socket_links(m)) < 0)
 455                         return r;
 456
 457                 if ((r = mount_add_swap_links(m)) < 0)
 458                         return r;
 459
 460                 if ((r = mount_add_path_links(m)) < 0)
 461                         return r;
 462
 463                 if ((r = mount_add_automount_links(m)) < 0)
 464                         return r;
 465
 466                 if ((r = mount_add_target_links(m)) < 0)
 467                         return r;
 468
 469                 if ((r = unit_add_default_cgroup(u)) < 0)
 470                         return r;
 471
 472                 if (m->meta.default_dependencies)
 473                         if ((r = mount_add_default_dependencies(m)) < 0)
 474                                 return r;
 475         }
 476
 477         return mount_verify(m);
 478 }
 479
 480 static int mount_notify_automount(Mount *m, int status) {
 481         Unit *p;
 482         int r;
 483
 484         assert(m);
 485
 486         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 487                 return r == -ENOENT ? 0 : r;
 488
 489         return automount_send_ready(AUTOMOUNT(p), status);
 490 }
 491
 492 static void mount_set_state(Mount *m, MountState state) {
 493         MountState old_state;
 494         assert(m);
 495
 496         old_state = m->state;
 497         m->state = state;
 498
 499         if (state != MOUNT_MOUNTING &&
 500             state != MOUNT_MOUNTING_DONE &&
 501             state != MOUNT_REMOUNTING &&
 502             state != MOUNT_UNMOUNTING &&
 503             state != MOUNT_MOUNTING_SIGTERM &&
 504             state != MOUNT_MOUNTING_SIGKILL &&
 505             state != MOUNT_UNMOUNTING_SIGTERM &&
 506             state != MOUNT_UNMOUNTING_SIGKILL &&
 507             state != MOUNT_REMOUNTING_SIGTERM &&
 508             state != MOUNT_REMOUNTING_SIGKILL) {
 509                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 510                 mount_unwatch_control_pid(m);
 511                 m->control_command = NULL;
 512                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 513         }
 514
 515         if (state == MOUNT_MOUNTED ||
 516             state == MOUNT_REMOUNTING)
 517                 mount_notify_automount(m, 0);
 518         else if (state == MOUNT_DEAD ||
 519                  state == MOUNT_UNMOUNTING ||
 520                  state == MOUNT_MOUNTING_SIGTERM ||
 521                  state == MOUNT_MOUNTING_SIGKILL ||
 522                  state == MOUNT_REMOUNTING_SIGTERM ||
 523                  state == MOUNT_REMOUNTING_SIGKILL ||
 524                  state == MOUNT_UNMOUNTING_SIGTERM ||
 525                  state == MOUNT_UNMOUNTING_SIGKILL ||
 526                  state == MOUNT_FAILED)
 527                 mount_notify_automount(m, -ENODEV);
 528
 529         if (state != old_state)
 530                 log_debug("%s changed %s -> %s",
 531                           m->meta.id,
 532                           mount_state_to_string(old_state),
 533                           mount_state_to_string(state));
 534
 535         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 536 }
 537
 538 static int mount_coldplug(Unit *u) {
 539         Mount *m = MOUNT(u);
 540         MountState new_state = MOUNT_DEAD;
 541         int r;
 542
 543         assert(m);
 544         assert(m->state == MOUNT_DEAD);
 545
 546         if (m->deserialized_state != m->state)
 547                 new_state = m->deserialized_state;
 548         else if (m->from_proc_self_mountinfo)
 549                 new_state = MOUNT_MOUNTED;
 550
 551         if (new_state != m->state) {
 552
 553                 if (new_state == MOUNT_MOUNTING ||
 554                     new_state == MOUNT_MOUNTING_DONE ||
 555                     new_state == MOUNT_REMOUNTING ||
 556                     new_state == MOUNT_UNMOUNTING ||
 557                     new_state == MOUNT_MOUNTING_SIGTERM ||
 558                     new_state == MOUNT_MOUNTING_SIGKILL ||
 559                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 560                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 561                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 562                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 563
 564                         if (m->control_pid <= 0)
 565                                 return -EBADMSG;
 566
 567                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 568                                 return r;
 569
 570                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 571                                 return r;
 572                 }
 573
 574                 mount_set_state(m, new_state);
 575         }
 576
 577         return 0;
 578 }
 579
 580 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 581         Mount *m = MOUNT(u);
 582         MountParameters *p;
 583
 584         assert(m);
 585         assert(f);
 586
 587         if (m->from_proc_self_mountinfo)
 588                 p = &m->parameters_proc_self_mountinfo;
 589         else if (m->from_fragment)
 590                 p = &m->parameters_fragment;
 591         else
 592                 p = &m->parameters_etc_fstab;
 593
 594         fprintf(f,
 595                 "%sMount State: %s\n"
 596                 "%sWhere: %s\n"
 597                 "%sWhat: %s\n"
 598                 "%sFile System Type: %s\n"
 599                 "%sOptions: %s\n"
 600                 "%sFrom /etc/fstab: %s\n"
 601                 "%sFrom /proc/self/mountinfo: %s\n"
 602                 "%sFrom fragment: %s\n"
 603                 "%sDirectoryMode: %04o\n",
 604                 prefix, mount_state_to_string(m->state),
 605                 prefix, m->where,
 606                 prefix, strna(p->what),
 607                 prefix, strna(p->fstype),
 608                 prefix, strna(p->options),
 609                 prefix, yes_no(m->from_etc_fstab),
 610                 prefix, yes_no(m->from_proc_self_mountinfo),
 611                 prefix, yes_no(m->from_fragment),
 612                 prefix, m->directory_mode);
 613
 614         if (m->control_pid > 0)
 615                 fprintf(f,
 616                         "%sControl PID: %lu\n",
 617                         prefix, (unsigned long) m->control_pid);
 618
 619         exec_context_dump(&m->exec_context, f, prefix);
 620 }
 621
 622 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 623         pid_t pid;
 624         int r;
 625
 626         assert(m);
 627         assert(c);
 628         assert(_pid);
 629
 630         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 631                 goto fail;
 632
 633         if ((r = exec_spawn(c,
 634                             NULL,
 635                             &m->exec_context,
 636                             NULL, 0,
 637                             m->meta.manager->environment,
 638                             true,
 639                             true,
 640                             true,
 641                             m->meta.manager->confirm_spawn,
 642                             m->meta.cgroup_bondings,
 643                             &pid)) < 0)
 644                 goto fail;
 645
 646         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 647                 /* FIXME: we need to do something here */
 648                 goto fail;
 649
 650         *_pid = pid;
 651
 652         return 0;
 653
 654 fail:
 655         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 656
 657         return r;
 658 }
 659
 660 static void mount_enter_dead(Mount *m, bool success) {
 661         assert(m);
 662
 663         if (!success)
 664                 m->failure = true;
 665
 666         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 667 }
 668
 669 static void mount_enter_mounted(Mount *m, bool success) {
 670         assert(m);
 671
 672         if (!success)
 673                 m->failure = true;
 674
 675         mount_set_state(m, MOUNT_MOUNTED);
 676 }
 677
 678 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 679         int r;
 680         Set *pid_set = NULL;
 681         bool wait_for_exit = false;
 682
 683         assert(m);
 684
 685         if (!success)
 686                 m->failure = true;
 687
 688         if (m->exec_context.kill_mode != KILL_NONE) {
 689                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 690                            state == MOUNT_UNMOUNTING_SIGTERM ||
 691                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 692
 693                 if (m->control_pid > 0) {
 694                         if (kill(m->exec_context.kill_mode == KILL_PROCESS_GROUP ?
 695                                  -m->control_pid :
 696                                  m->control_pid, sig) < 0 && errno != ESRCH)
 697
 698                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 699                         else
 700                                 wait_for_exit = true;
 701                 }
 702
 703                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 704
 705                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 706                                 r = -ENOMEM;
 707                                 goto fail;
 708                         }
 709
 710                         /* Exclude the control pid from being killed via the cgroup */
 711                         if (m->control_pid > 0)
 712                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 713                                         goto fail;
 714
 715                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, pid_set)) < 0) {
 716                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 717                                         log_warning("Failed to kill control group: %s", strerror(-r));
 718                         } else if (r > 0)
 719                                 wait_for_exit = true;
 720
 721                         set_free(pid_set);
 722                 }
 723         }
 724
 725         if (wait_for_exit) {
 726                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 727                         goto fail;
 728
 729                 mount_set_state(m, state);
 730         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 731                 mount_enter_mounted(m, true);
 732         else
 733                 mount_enter_dead(m, true);
 734
 735         return;
 736
 737 fail:
 738         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 739
 740         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 741                 mount_enter_mounted(m, false);
 742         else
 743                 mount_enter_dead(m, false);
 744
 745         if (pid_set)
 746                 set_free(pid_set);
 747 }
 748
 749 static void mount_enter_unmounting(Mount *m, bool success) {
 750         int r;
 751
 752         assert(m);
 753
 754         if (!success)
 755                 m->failure = true;
 756
 757         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 758         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 759
 760         if ((r = exec_command_set(
 761                              m->control_command,
 762                              "/bin/umount",
 763                              m->where,
 764                              NULL)) < 0)
 765                 goto fail;
 766
 767         mount_unwatch_control_pid(m);
 768
 769         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 770                 goto fail;
 771
 772         mount_set_state(m, MOUNT_UNMOUNTING);
 773
 774         return;
 775
 776 fail:
 777         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 778         mount_enter_mounted(m, false);
 779 }
 780
 781 static void mount_enter_mounting(Mount *m) {
 782         int r;
 783
 784         assert(m);
 785
 786         m->control_command_id = MOUNT_EXEC_MOUNT;
 787         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 788
 789         mkdir_p(m->where, m->directory_mode);
 790
 791         if (m->from_fragment)
 792                 r = exec_command_set(
 793                                 m->control_command,
 794                                 "/bin/mount",
 795                                 m->parameters_fragment.what,
 796                                 m->where,
 797                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 798                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 799                                 NULL);
 800         else if (m->from_etc_fstab)
 801                 r = exec_command_set(
 802                                 m->control_command,
 803                                 "/bin/mount",
 804                                 m->where,
 805                                 NULL);
 806         else
 807                 r = -ENOENT;
 808
 809         if (r < 0)
 810                 goto fail;
 811
 812         mount_unwatch_control_pid(m);
 813
 814         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 815                 goto fail;
 816
 817         mount_set_state(m, MOUNT_MOUNTING);
 818
 819         return;
 820
 821 fail:
 822         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 823         mount_enter_dead(m, false);
 824 }
 825
 826 static void mount_enter_mounting_done(Mount *m) {
 827         assert(m);
 828
 829         mount_set_state(m, MOUNT_MOUNTING_DONE);
 830 }
 831
 832 static void mount_enter_remounting(Mount *m, bool success) {
 833         int r;
 834
 835         assert(m);
 836
 837         if (!success)
 838                 m->failure = true;
 839
 840         m->control_command_id = MOUNT_EXEC_REMOUNT;
 841         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 842
 843         if (m->from_fragment) {
 844                 char *buf = NULL;
 845                 const char *o;
 846
 847                 if (m->parameters_fragment.options) {
 848                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 849                                 r = -ENOMEM;
 850                                 goto fail;
 851                         }
 852
 853                         o = buf;
 854                 } else
 855                         o = "remount";
 856
 857                 r = exec_command_set(
 858                                 m->control_command,
 859                                 "/bin/mount",
 860                                 m->parameters_fragment.what,
 861                                 m->where,
 862                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 863                                 "-o", o,
 864                                 NULL);
 865
 866                 free(buf);
 867         } else if (m->from_etc_fstab)
 868                 r = exec_command_set(
 869                                 m->control_command,
 870                                 "/bin/mount",
 871                                 m->where,
 872                                 "-o", "remount",
 873                                 NULL);
 874         else
 875                 r = -ENOENT;
 876
 877         if (r < 0) {
 878                 r = -ENOMEM;
 879                 goto fail;
 880         }
 881
 882         mount_unwatch_control_pid(m);
 883
 884         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 885                 goto fail;
 886
 887         mount_set_state(m, MOUNT_REMOUNTING);
 888
 889         return;
 890
 891 fail:
 892         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 893         mount_enter_mounted(m, false);
 894 }
 895
 896 static int mount_start(Unit *u) {
 897         Mount *m = MOUNT(u);
 898
 899         assert(m);
 900
 901         /* We cannot fulfill this request right now, try again later
 902          * please! */
 903         if (m->state == MOUNT_UNMOUNTING ||
 904             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 905             m->state == MOUNT_UNMOUNTING_SIGKILL)
 906                 return -EAGAIN;
 907
 908         /* Already on it! */
 909         if (m->state == MOUNT_MOUNTING ||
 910             m->state == MOUNT_MOUNTING_SIGTERM ||
 911             m->state == MOUNT_MOUNTING_SIGKILL)
 912                 return 0;
 913
 914         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
 915
 916         m->failure = false;
 917         mount_enter_mounting(m);
 918         return 0;
 919 }
 920
 921 static int mount_stop(Unit *u) {
 922         Mount *m = MOUNT(u);
 923
 924         assert(m);
 925
 926         /* Already on it */
 927         if (m->state == MOUNT_UNMOUNTING ||
 928             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 929             m->state == MOUNT_UNMOUNTING_SIGTERM)
 930                 return 0;
 931
 932         assert(m->state == MOUNT_MOUNTING ||
 933                m->state == MOUNT_MOUNTING_DONE ||
 934                m->state == MOUNT_MOUNTED ||
 935                m->state == MOUNT_MOUNTING_SIGTERM ||
 936                m->state == MOUNT_MOUNTING_SIGKILL ||
 937                m->state == MOUNT_REMOUNTING ||
 938                m->state == MOUNT_REMOUNTING_SIGTERM ||
 939                m->state == MOUNT_REMOUNTING_SIGKILL);
 940
 941         mount_enter_unmounting(m, true);
 942         return 0;
 943 }
 944
 945 static int mount_reload(Unit *u) {
 946         Mount *m = MOUNT(u);
 947
 948         assert(m);
 949
 950         if (m->state == MOUNT_MOUNTING_DONE)
 951                 return -EAGAIN;
 952
 953         assert(m->state == MOUNT_MOUNTED);
 954
 955         mount_enter_remounting(m, true);
 956         return 0;
 957 }
 958
 959 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
 960         Mount *m = MOUNT(u);
 961
 962         assert(m);
 963         assert(f);
 964         assert(fds);
 965
 966         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
 967         unit_serialize_item(u, f, "failure", yes_no(m->failure));
 968
 969         if (m->control_pid > 0)
 970                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
 971
 972         if (m->control_command_id >= 0)
 973                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
 974
 975         return 0;
 976 }
 977
 978 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 979         Mount *m = MOUNT(u);
 980
 981         assert(u);
 982         assert(key);
 983         assert(value);
 984         assert(fds);
 985
 986         if (streq(key, "state")) {
 987                 MountState state;
 988
 989                 if ((state = mount_state_from_string(value)) < 0)
 990                         log_debug("Failed to parse state value %s", value);
 991                 else
 992                         m->deserialized_state = state;
 993         } else if (streq(key, "failure")) {
 994                 int b;
 995
 996                 if ((b = parse_boolean(value)) < 0)
 997                         log_debug("Failed to parse failure value %s", value);
 998                 else
 999                         m->failure = b || m->failure;
1000
1001         } else if (streq(key, "control-pid")) {
1002                 pid_t pid;
1003
1004                 if (parse_pid(value, &pid) < 0)
1005                         log_debug("Failed to parse control-pid value %s", value);
1006                 else
1007                         m->control_pid = pid;
1008         } else if (streq(key, "control-command")) {
1009                 MountExecCommand id;
1010
1011                 if ((id = mount_exec_command_from_string(value)) < 0)
1012                         log_debug("Failed to parse exec-command value %s", value);
1013                 else {
1014                         m->control_command_id = id;
1015                         m->control_command = m->exec_command + id;
1016                 }
1017
1018         } else
1019                 log_debug("Unknown serialization key '%s'", key);
1020
1021         return 0;
1022 }
1023
1024 static UnitActiveState mount_active_state(Unit *u) {
1025         assert(u);
1026
1027         return state_translation_table[MOUNT(u)->state];
1028 }
1029
1030 static const char *mount_sub_state_to_string(Unit *u) {
1031         assert(u);
1032
1033         return mount_state_to_string(MOUNT(u)->state);
1034 }
1035
1036 static bool mount_check_gc(Unit *u) {
1037         Mount *m = MOUNT(u);
1038
1039         assert(m);
1040
1041         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1042 }
1043
1044 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1045         Mount *m = MOUNT(u);
1046         bool success;
1047
1048         assert(m);
1049         assert(pid >= 0);
1050
1051         if (pid != m->control_pid)
1052                 return;
1053
1054         m->control_pid = 0;
1055
1056         success = is_clean_exit(code, status);
1057         m->failure = m->failure || !success;
1058
1059         if (m->control_command) {
1060                 exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id);
1061                 m->control_command = NULL;
1062                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1063         }
1064
1065         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1066                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1067
1068         /* Note that mount(8) returning and the kernel sending us a
1069          * mount table change event might happen out-of-order. If an
1070          * operation succeed we assume the kernel will follow soon too
1071          * and already change into the resulting state.  If it fails
1072          * we check if the kernel still knows about the mount. and
1073          * change state accordingly. */
1074
1075         switch (m->state) {
1076
1077         case MOUNT_MOUNTING:
1078         case MOUNT_MOUNTING_DONE:
1079         case MOUNT_MOUNTING_SIGKILL:
1080         case MOUNT_MOUNTING_SIGTERM:
1081         case MOUNT_REMOUNTING:
1082         case MOUNT_REMOUNTING_SIGKILL:
1083         case MOUNT_REMOUNTING_SIGTERM:
1084
1085                 if (success)
1086                         mount_enter_mounted(m, true);
1087                 else if (m->from_proc_self_mountinfo)
1088                         mount_enter_mounted(m, false);
1089                 else
1090                         mount_enter_dead(m, false);
1091                 break;
1092
1093         case MOUNT_UNMOUNTING:
1094         case MOUNT_UNMOUNTING_SIGKILL:
1095         case MOUNT_UNMOUNTING_SIGTERM:
1096
1097                 if (success)
1098                         mount_enter_dead(m, true);
1099                 else if (m->from_proc_self_mountinfo)
1100                         mount_enter_mounted(m, false);
1101                 else
1102                         mount_enter_dead(m, false);
1103                 break;
1104
1105         default:
1106                 assert_not_reached("Uh, control process died at wrong time.");
1107         }
1108
1109         /* Notify clients about changed exit status */
1110         unit_add_to_dbus_queue(u);
1111 }
1112
1113 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1114         Mount *m = MOUNT(u);
1115
1116         assert(m);
1117         assert(elapsed == 1);
1118         assert(w == &m->timer_watch);
1119
1120         switch (m->state) {
1121
1122         case MOUNT_MOUNTING:
1123         case MOUNT_MOUNTING_DONE:
1124                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1125                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1126                 break;
1127
1128         case MOUNT_REMOUNTING:
1129                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1130                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
1131                 break;
1132
1133         case MOUNT_UNMOUNTING:
1134                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1135                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1136                 break;
1137
1138         case MOUNT_MOUNTING_SIGTERM:
1139                 log_warning("%s mounting timed out. Killing.", u->meta.id);
1140                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1141                 break;
1142
1143         case MOUNT_REMOUNTING_SIGTERM:
1144                 log_warning("%s remounting timed out. Killing.", u->meta.id);
1145                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1146                 break;
1147
1148         case MOUNT_UNMOUNTING_SIGTERM:
1149                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
1150                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1151                 break;
1152
1153         case MOUNT_MOUNTING_SIGKILL:
1154         case MOUNT_REMOUNTING_SIGKILL:
1155         case MOUNT_UNMOUNTING_SIGKILL:
1156                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1157
1158                 if (m->from_proc_self_mountinfo)
1159                         mount_enter_mounted(m, false);
1160                 else
1161                         mount_enter_dead(m, false);
1162                 break;
1163
1164         default:
1165                 assert_not_reached("Timeout at wrong time.");
1166         }
1167 }
1168
1169 static int mount_add_one(
1170                 Manager *m,
1171                 const char *what,
1172                 const char *where,
1173                 const char *options,
1174                 const char *fstype,
1175                 bool from_proc_self_mountinfo,
1176                 bool set_flags) {
1177         int r;
1178         Unit *u;
1179         bool delete;
1180         char *e, *w = NULL, *o = NULL, *f = NULL;
1181         MountParameters *p;
1182
1183         assert(m);
1184         assert(what);
1185         assert(where);
1186         assert(options);
1187         assert(fstype);
1188
1189         assert(!set_flags || from_proc_self_mountinfo);
1190
1191         /* Ignore API mount points. They should never be referenced in
1192          * dependencies ever. */
1193         if (mount_point_is_api(where))
1194                 return 0;
1195
1196         if (streq(fstype, "autofs"))
1197                 return 0;
1198
1199         /* probably some kind of swap, ignore */
1200         if (!is_path(where))
1201                 return 0;
1202
1203         if (!(e = unit_name_from_path(where, ".mount")))
1204                 return -ENOMEM;
1205
1206         if (!(u = manager_get_unit(m, e))) {
1207                 delete = true;
1208
1209                 if (!(u = unit_new(m))) {
1210                         free(e);
1211                         return -ENOMEM;
1212                 }
1213
1214                 r = unit_add_name(u, e);
1215                 free(e);
1216
1217                 if (r < 0)
1218                         goto fail;
1219
1220                 if (!(MOUNT(u)->where = strdup(where))) {
1221                         r = -ENOMEM;
1222                         goto fail;
1223                 }
1224
1225                 unit_add_to_load_queue(u);
1226         } else {
1227                 delete = false;
1228                 free(e);
1229         }
1230
1231         if (!(w = strdup(what)) ||
1232             !(o = strdup(options)) ||
1233             !(f = strdup(fstype))) {
1234                 r = -ENOMEM;
1235                 goto fail;
1236         }
1237
1238         if (from_proc_self_mountinfo) {
1239                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1240
1241                 if (set_flags) {
1242                         MOUNT(u)->is_mounted = true;
1243                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1244                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1245                 }
1246
1247                 MOUNT(u)->from_proc_self_mountinfo = true;
1248         } else {
1249                 p = &MOUNT(u)->parameters_etc_fstab;
1250                 MOUNT(u)->from_etc_fstab = true;
1251         }
1252
1253         free(p->what);
1254         p->what = w;
1255
1256         free(p->options);
1257         p->options = o;
1258
1259         free(p->fstype);
1260         p->fstype = f;
1261
1262         unit_add_to_dbus_queue(u);
1263
1264         return 0;
1265
1266 fail:
1267         free(w);
1268         free(o);
1269         free(f);
1270
1271         if (delete && u)
1272                 unit_free(u);
1273
1274         return r;
1275 }
1276
1277 static char *fstab_node_to_udev_node(char *p) {
1278         char *dn, *t, *u;
1279         int r;
1280
1281         /* FIXME: to follow udev's logic 100% we need to leave valid
1282          * UTF8 chars unescaped */
1283
1284         if (startswith(p, "LABEL=")) {
1285
1286                 if (!(u = unquote(p+6, "\"\'")))
1287                         return NULL;
1288
1289                 t = xescape(u, "/ ");
1290                 free(u);
1291
1292                 if (!t)
1293                         return NULL;
1294
1295                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
1296                 free(t);
1297
1298                 if (r < 0)
1299                         return NULL;
1300
1301                 return dn;
1302         }
1303
1304         if (startswith(p, "UUID=")) {
1305
1306                 if (!(u = unquote(p+5, "\"\'")))
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-uuid/%s", ascii_strlower(t));
1316                 free(t);
1317
1318                 if (r < 0)
1319                         return NULL;
1320
1321                 return dn;
1322         }
1323
1324         return strdup(p);
1325 }
1326
1327 static int mount_find_pri(char *options) {
1328         char *end, *pri;
1329         unsigned long r;
1330
1331         if (!(pri = mount_test_option(options, "pri=")))
1332                 return 0;
1333
1334         pri += 4;
1335
1336         errno = 0;
1337         r = strtoul(pri, &end, 10);
1338
1339         if (errno != 0)
1340                 return -errno;
1341
1342         if (end == pri || (*end != ',' && *end != 0))
1343                 return -EINVAL;
1344
1345         return (int) r;
1346 }
1347
1348 static int mount_load_etc_fstab(Manager *m) {
1349         FILE *f;
1350         int r;
1351         struct mntent* me;
1352
1353         assert(m);
1354
1355         errno = 0;
1356         if (!(f = setmntent("/etc/fstab", "r")))
1357                 return -errno;
1358
1359         while ((me = getmntent(f))) {
1360                 char *where, *what;
1361
1362                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1363                         r = -ENOMEM;
1364                         goto finish;
1365                 }
1366
1367                 if (!(where = strdup(me->mnt_dir))) {
1368                         free(what);
1369                         r = -ENOMEM;
1370                         goto finish;
1371                 }
1372
1373                 if (what[0] == '/')
1374                         path_kill_slashes(what);
1375
1376                 if (where[0] == '/')
1377                         path_kill_slashes(where);
1378
1379                 if (streq(me->mnt_type, "swap")) {
1380                         int pri;
1381
1382                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1383                                 r = pri;
1384                         else
1385                                 r = swap_add_one(m,
1386                                                  what,
1387                                                  pri,
1388                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1389                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1390                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1391                                                  false);
1392                 } else
1393                         r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1394
1395                 free(what);
1396                 free(where);
1397
1398                 if (r < 0)
1399                         goto finish;
1400         }
1401
1402         r = 0;
1403 finish:
1404
1405         endmntent(f);
1406         return r;
1407 }
1408
1409 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1410         int r;
1411         unsigned i;
1412         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1413
1414         assert(m);
1415
1416         rewind(m->proc_self_mountinfo);
1417
1418         for (i = 1;; i++) {
1419                 int k;
1420
1421                 device = path = options = options2 = fstype = d = p = o = NULL;
1422
1423                 if ((k = fscanf(m->proc_self_mountinfo,
1424                                 "%*s "       /* (1) mount id */
1425                                 "%*s "       /* (2) parent id */
1426                                 "%*s "       /* (3) major:minor */
1427                                 "%*s "       /* (4) root */
1428                                 "%ms "       /* (5) mount point */
1429                                 "%ms"        /* (6) mount options */
1430                                 "%*[^-]"     /* (7) optional fields */
1431                                 "- "         /* (8) separator */
1432                                 "%ms "       /* (9) file system type */
1433                                 "%ms"        /* (10) mount source */
1434                                 "%ms"        /* (11) mount options 2 */
1435                                 "%*[^\n]",   /* some rubbish at the end */
1436                                 &path,
1437                                 &options,
1438                                 &fstype,
1439                                 &device,
1440                                 &options2)) != 5) {
1441
1442                         if (k == EOF)
1443                                 break;
1444
1445                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1446                         goto clean_up;
1447                 }
1448
1449                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1450                         r = -ENOMEM;
1451                         goto finish;
1452                 }
1453
1454                 if (!(d = cunescape(device)) ||
1455                     !(p = cunescape(path))) {
1456                         r = -ENOMEM;
1457                         goto finish;
1458                 }
1459
1460                 if ((r = mount_add_one(m, d, p, o, fstype, true, set_flags)) < 0)
1461                         goto finish;
1462
1463 clean_up:
1464                 free(device);
1465                 free(path);
1466                 free(options);
1467                 free(options2);
1468                 free(fstype);
1469                 free(d);
1470                 free(p);
1471                 free(o);
1472         }
1473
1474         r = 0;
1475
1476 finish:
1477         free(device);
1478         free(path);
1479         free(options);
1480         free(options2);
1481         free(fstype);
1482         free(d);
1483         free(p);
1484         free(o);
1485
1486         return r;
1487 }
1488
1489 static void mount_shutdown(Manager *m) {
1490         assert(m);
1491
1492         if (m->proc_self_mountinfo) {
1493                 fclose(m->proc_self_mountinfo);
1494                 m->proc_self_mountinfo = NULL;
1495         }
1496 }
1497
1498 static int mount_enumerate(Manager *m) {
1499         int r;
1500         struct epoll_event ev;
1501         assert(m);
1502
1503         if (!m->proc_self_mountinfo) {
1504                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1505                         return -errno;
1506
1507                 m->mount_watch.type = WATCH_MOUNT;
1508                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1509
1510                 zero(ev);
1511                 ev.events = EPOLLERR;
1512                 ev.data.ptr = &m->mount_watch;
1513
1514                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1515                         return -errno;
1516         }
1517
1518         if ((r = mount_load_etc_fstab(m)) < 0)
1519                 goto fail;
1520
1521         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1522                 goto fail;
1523
1524         return 0;
1525
1526 fail:
1527         mount_shutdown(m);
1528         return r;
1529 }
1530
1531 void mount_fd_event(Manager *m, int events) {
1532         Meta *meta;
1533         int r;
1534
1535         assert(m);
1536         assert(events == EPOLLERR);
1537
1538         /* The manager calls this for every fd event happening on the
1539          * /proc/self/mountinfo file, which informs us about mounting
1540          * table changes */
1541
1542         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1543                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1544
1545                 /* Reset flags, just in case, for later calls */
1546                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1547                         Mount *mount = (Mount*) meta;
1548
1549                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1550                 }
1551
1552                 return;
1553         }
1554
1555         manager_dispatch_load_queue(m);
1556
1557         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1558                 Mount *mount = (Mount*) meta;
1559
1560                 if (!mount->is_mounted) {
1561                         /* This has just been unmounted. */
1562
1563                         mount->from_proc_self_mountinfo = false;
1564
1565                         switch (mount->state) {
1566
1567                         case MOUNT_MOUNTED:
1568                                 mount_enter_dead(mount, true);
1569                                 break;
1570
1571                         default:
1572                                 mount_set_state(mount, mount->state);
1573                                 break;
1574
1575                         }
1576
1577                 } else if (mount->just_mounted || mount->just_changed) {
1578
1579                         /* New or changed entrymount */
1580
1581                         switch (mount->state) {
1582
1583                         case MOUNT_DEAD:
1584                         case MOUNT_FAILED:
1585                                 mount_enter_mounted(mount, true);
1586                                 break;
1587
1588                         case MOUNT_MOUNTING:
1589                                 mount_enter_mounting_done(mount);
1590                                 break;
1591
1592                         default:
1593                                 /* Nothing really changed, but let's
1594                                  * issue an notification call
1595                                  * nonetheless, in case somebody is
1596                                  * waiting for this. (e.g. file system
1597                                  * ro/rw remounts.) */
1598                                 mount_set_state(mount, mount->state);
1599                                 break;
1600                         }
1601                 }
1602
1603                 /* Reset the flags for later calls */
1604                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1605         }
1606 }
1607
1608 static void mount_reset_failed(Unit *u) {
1609         Mount *m = MOUNT(u);
1610
1611         assert(m);
1612
1613         if (m->state == MOUNT_FAILED)
1614                 mount_set_state(m, MOUNT_DEAD);
1615
1616         m->failure = false;
1617 }
1618
1619 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1620         [MOUNT_DEAD] = "dead",
1621         [MOUNT_MOUNTING] = "mounting",
1622         [MOUNT_MOUNTING_DONE] = "mounting-done",
1623         [MOUNT_MOUNTED] = "mounted",
1624         [MOUNT_REMOUNTING] = "remounting",
1625         [MOUNT_UNMOUNTING] = "unmounting",
1626         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1627         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1628         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1629         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1630         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1631         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1632         [MOUNT_FAILED] = "failed"
1633 };
1634
1635 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1636
1637 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1638         [MOUNT_EXEC_MOUNT] = "ExecMount",
1639         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1640         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1641 };
1642
1643 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1644
1645 const UnitVTable mount_vtable = {
1646         .suffix = ".mount",
1647
1648         .no_alias = true,
1649         .no_instances = true,
1650         .no_isolate = true,
1651         .show_status = true,
1652
1653         .init = mount_init,
1654         .load = mount_load,
1655         .done = mount_done,
1656
1657         .coldplug = mount_coldplug,
1658
1659         .dump = mount_dump,
1660
1661         .start = mount_start,
1662         .stop = mount_stop,
1663         .reload = mount_reload,
1664
1665         .serialize = mount_serialize,
1666         .deserialize_item = mount_deserialize_item,
1667
1668         .active_state = mount_active_state,
1669         .sub_state_to_string = mount_sub_state_to_string,
1670
1671         .check_gc = mount_check_gc,
1672
1673         .sigchld_event = mount_sigchld_event,
1674         .timer_event = mount_timer_event,
1675
1676         .reset_failed = mount_reset_failed,
1677
1678         .bus_interface = "org.freedesktop.systemd1.Mount",
1679         .bus_message_handler = bus_mount_message_handler,
1680         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1681
1682         .enumerate = mount_enumerate,
1683         .shutdown = mount_shutdown
1684 };