src/mount.c

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