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->exec_context.kill_mode == KILL_PROCESS_GROUP ?
 751                                              -m->control_pid :
 752                                              m->control_pid, sig) < 0 && errno != ESRCH)
 753
 754                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 755                         else
 756                                 wait_for_exit = true;
 757                 }
 758
 759                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 760
 761                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 762                                 r = -ENOMEM;
 763                                 goto fail;
 764                         }
 765
 766                         /* Exclude the control pid from being killed via the cgroup */
 767                         if (m->control_pid > 0)
 768                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 769                                         goto fail;
 770
 771                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
 772                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 773                                         log_warning("Failed to kill control group: %s", strerror(-r));
 774                         } else if (r > 0)
 775                                 wait_for_exit = true;
 776
 777                         set_free(pid_set);
 778                 }
 779         }
 780
 781         if (wait_for_exit) {
 782                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 783                         goto fail;
 784
 785                 mount_set_state(m, state);
 786         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 787                 mount_enter_mounted(m, true);
 788         else
 789                 mount_enter_dead(m, true);
 790
 791         return;
 792
 793 fail:
 794         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 795
 796         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 797                 mount_enter_mounted(m, false);
 798         else
 799                 mount_enter_dead(m, false);
 800
 801         if (pid_set)
 802                 set_free(pid_set);
 803 }
 804
 805 static void mount_enter_unmounting(Mount *m, bool success) {
 806         int r;
 807
 808         assert(m);
 809
 810         if (!success)
 811                 m->failure = true;
 812
 813         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 814         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 815
 816         if ((r = exec_command_set(
 817                              m->control_command,
 818                              "/bin/umount",
 819                              m->where,
 820                              NULL)) < 0)
 821                 goto fail;
 822
 823         mount_unwatch_control_pid(m);
 824
 825         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 826                 goto fail;
 827
 828         mount_set_state(m, MOUNT_UNMOUNTING);
 829
 830         return;
 831
 832 fail:
 833         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 834         mount_enter_mounted(m, false);
 835 }
 836
 837 static void mount_enter_mounting(Mount *m) {
 838         int r;
 839
 840         assert(m);
 841
 842         m->control_command_id = MOUNT_EXEC_MOUNT;
 843         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 844
 845         mkdir_p(m->where, m->directory_mode);
 846
 847         /* create the source directory for bind-mounts if needed */
 848         if (m->parameters_fragment.fstype && strcmp(m->parameters_fragment.fstype, "bind") == 0)
 849                 mkdir_p(m->parameters_fragment.what, m->directory_mode);
 850
 851         if (m->from_fragment)
 852                 r = exec_command_set(
 853                                 m->control_command,
 854                                 "/bin/mount",
 855                                 m->parameters_fragment.what,
 856                                 m->where,
 857                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 858                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 859                                 NULL);
 860         else if (m->from_etc_fstab)
 861                 r = exec_command_set(
 862                                 m->control_command,
 863                                 "/bin/mount",
 864                                 m->where,
 865                                 NULL);
 866         else
 867                 r = -ENOENT;
 868
 869         if (r < 0)
 870                 goto fail;
 871
 872         mount_unwatch_control_pid(m);
 873
 874         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 875                 goto fail;
 876
 877         mount_set_state(m, MOUNT_MOUNTING);
 878
 879         return;
 880
 881 fail:
 882         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 883         mount_enter_dead(m, false);
 884 }
 885
 886 static void mount_enter_mounting_done(Mount *m) {
 887         assert(m);
 888
 889         mount_set_state(m, MOUNT_MOUNTING_DONE);
 890 }
 891
 892 static void mount_enter_remounting(Mount *m, bool success) {
 893         int r;
 894
 895         assert(m);
 896
 897         if (!success)
 898                 m->failure = true;
 899
 900         m->control_command_id = MOUNT_EXEC_REMOUNT;
 901         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 902
 903         if (m->from_fragment) {
 904                 char *buf = NULL;
 905                 const char *o;
 906
 907                 if (m->parameters_fragment.options) {
 908                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 909                                 r = -ENOMEM;
 910                                 goto fail;
 911                         }
 912
 913                         o = buf;
 914                 } else
 915                         o = "remount";
 916
 917                 r = exec_command_set(
 918                                 m->control_command,
 919                                 "/bin/mount",
 920                                 m->parameters_fragment.what,
 921                                 m->where,
 922                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 923                                 "-o", o,
 924                                 NULL);
 925
 926                 free(buf);
 927         } else if (m->from_etc_fstab)
 928                 r = exec_command_set(
 929                                 m->control_command,
 930                                 "/bin/mount",
 931                                 m->where,
 932                                 "-o", "remount",
 933                                 NULL);
 934         else
 935                 r = -ENOENT;
 936
 937         if (r < 0)
 938                 goto fail;
 939
 940         mount_unwatch_control_pid(m);
 941
 942         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 943                 goto fail;
 944
 945         mount_set_state(m, MOUNT_REMOUNTING);
 946
 947         return;
 948
 949 fail:
 950         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 951         m->reload_failure = true;
 952         mount_enter_mounted(m, true);
 953 }
 954
 955 static int mount_start(Unit *u) {
 956         Mount *m = MOUNT(u);
 957
 958         assert(m);
 959
 960         /* We cannot fulfill this request right now, try again later
 961          * please! */
 962         if (m->state == MOUNT_UNMOUNTING ||
 963             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 964             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 965             m->state == MOUNT_MOUNTING_SIGTERM ||
 966             m->state == MOUNT_MOUNTING_SIGKILL)
 967                 return -EAGAIN;
 968
 969         /* Already on it! */
 970         if (m->state == MOUNT_MOUNTING)
 971                 return 0;
 972
 973         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
 974
 975         m->failure = false;
 976         mount_enter_mounting(m);
 977         return 0;
 978 }
 979
 980 static int mount_stop(Unit *u) {
 981         Mount *m = MOUNT(u);
 982
 983         assert(m);
 984
 985         /* Already on it */
 986         if (m->state == MOUNT_UNMOUNTING ||
 987             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 988             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 989             m->state == MOUNT_MOUNTING_SIGTERM ||
 990             m->state == MOUNT_MOUNTING_SIGKILL)
 991                 return 0;
 992
 993         assert(m->state == MOUNT_MOUNTING ||
 994                m->state == MOUNT_MOUNTING_DONE ||
 995                m->state == MOUNT_MOUNTED ||
 996                m->state == MOUNT_REMOUNTING ||
 997                m->state == MOUNT_REMOUNTING_SIGTERM ||
 998                m->state == MOUNT_REMOUNTING_SIGKILL);
 999
1000         mount_enter_unmounting(m, true);
1001         return 0;
1002 }
1003
1004 static int mount_reload(Unit *u) {
1005         Mount *m = MOUNT(u);
1006
1007         assert(m);
1008
1009         if (m->state == MOUNT_MOUNTING_DONE)
1010                 return -EAGAIN;
1011
1012         assert(m->state == MOUNT_MOUNTED);
1013
1014         mount_enter_remounting(m, true);
1015         return 0;
1016 }
1017
1018 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1019         Mount *m = MOUNT(u);
1020
1021         assert(m);
1022         assert(f);
1023         assert(fds);
1024
1025         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1026         unit_serialize_item(u, f, "failure", yes_no(m->failure));
1027
1028         if (m->control_pid > 0)
1029                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1030
1031         if (m->control_command_id >= 0)
1032                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1033
1034         return 0;
1035 }
1036
1037 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1038         Mount *m = MOUNT(u);
1039
1040         assert(u);
1041         assert(key);
1042         assert(value);
1043         assert(fds);
1044
1045         if (streq(key, "state")) {
1046                 MountState state;
1047
1048                 if ((state = mount_state_from_string(value)) < 0)
1049                         log_debug("Failed to parse state value %s", value);
1050                 else
1051                         m->deserialized_state = state;
1052         } else if (streq(key, "failure")) {
1053                 int b;
1054
1055                 if ((b = parse_boolean(value)) < 0)
1056                         log_debug("Failed to parse failure value %s", value);
1057                 else
1058                         m->failure = b || m->failure;
1059
1060         } else if (streq(key, "control-pid")) {
1061                 pid_t pid;
1062
1063                 if (parse_pid(value, &pid) < 0)
1064                         log_debug("Failed to parse control-pid value %s", value);
1065                 else
1066                         m->control_pid = pid;
1067         } else if (streq(key, "control-command")) {
1068                 MountExecCommand id;
1069
1070                 if ((id = mount_exec_command_from_string(value)) < 0)
1071                         log_debug("Failed to parse exec-command value %s", value);
1072                 else {
1073                         m->control_command_id = id;
1074                         m->control_command = m->exec_command + id;
1075                 }
1076
1077         } else
1078                 log_debug("Unknown serialization key '%s'", key);
1079
1080         return 0;
1081 }
1082
1083 static UnitActiveState mount_active_state(Unit *u) {
1084         assert(u);
1085
1086         return state_translation_table[MOUNT(u)->state];
1087 }
1088
1089 static const char *mount_sub_state_to_string(Unit *u) {
1090         assert(u);
1091
1092         return mount_state_to_string(MOUNT(u)->state);
1093 }
1094
1095 static bool mount_check_gc(Unit *u) {
1096         Mount *m = MOUNT(u);
1097
1098         assert(m);
1099
1100         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1101 }
1102
1103 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1104         Mount *m = MOUNT(u);
1105         bool success;
1106
1107         assert(m);
1108         assert(pid >= 0);
1109
1110         if (pid != m->control_pid)
1111                 return;
1112
1113         m->control_pid = 0;
1114
1115         success = is_clean_exit(code, status);
1116         m->failure = m->failure || !success;
1117
1118         if (m->control_command) {
1119                 exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id);
1120                 m->control_command = NULL;
1121                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1122         }
1123
1124         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1125                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1126
1127         /* Note that mount(8) returning and the kernel sending us a
1128          * mount table change event might happen out-of-order. If an
1129          * operation succeed we assume the kernel will follow soon too
1130          * and already change into the resulting state.  If it fails
1131          * we check if the kernel still knows about the mount. and
1132          * change state accordingly. */
1133
1134         switch (m->state) {
1135
1136         case MOUNT_MOUNTING:
1137         case MOUNT_MOUNTING_DONE:
1138         case MOUNT_MOUNTING_SIGKILL:
1139         case MOUNT_MOUNTING_SIGTERM:
1140
1141                 if (success)
1142                         mount_enter_mounted(m, true);
1143                 else if (m->from_proc_self_mountinfo)
1144                         mount_enter_mounted(m, false);
1145                 else
1146                         mount_enter_dead(m, false);
1147                 break;
1148
1149         case MOUNT_REMOUNTING:
1150         case MOUNT_REMOUNTING_SIGKILL:
1151         case MOUNT_REMOUNTING_SIGTERM:
1152
1153                 m->reload_failure = !success;
1154                 if (m->from_proc_self_mountinfo)
1155                         mount_enter_mounted(m, true);
1156                 else
1157                         mount_enter_dead(m, true);
1158
1159                 break;
1160
1161         case MOUNT_UNMOUNTING:
1162         case MOUNT_UNMOUNTING_SIGKILL:
1163         case MOUNT_UNMOUNTING_SIGTERM:
1164
1165                 if (success)
1166                         mount_enter_dead(m, true);
1167                 else if (m->from_proc_self_mountinfo)
1168                         mount_enter_mounted(m, false);
1169                 else
1170                         mount_enter_dead(m, false);
1171                 break;
1172
1173         default:
1174                 assert_not_reached("Uh, control process died at wrong time.");
1175         }
1176
1177         /* Notify clients about changed exit status */
1178         unit_add_to_dbus_queue(u);
1179 }
1180
1181 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1182         Mount *m = MOUNT(u);
1183
1184         assert(m);
1185         assert(elapsed == 1);
1186         assert(w == &m->timer_watch);
1187
1188         switch (m->state) {
1189
1190         case MOUNT_MOUNTING:
1191         case MOUNT_MOUNTING_DONE:
1192                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1193                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1194                 break;
1195
1196         case MOUNT_REMOUNTING:
1197                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1198                 m->reload_failure = true;
1199                 mount_enter_mounted(m, true);
1200                 break;
1201
1202         case MOUNT_UNMOUNTING:
1203                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1204                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1205                 break;
1206
1207         case MOUNT_MOUNTING_SIGTERM:
1208                 if (m->exec_context.send_sigkill) {
1209                         log_warning("%s mounting timed out. Killing.", u->meta.id);
1210                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1211                 } else {
1212                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1213
1214                         if (m->from_proc_self_mountinfo)
1215                                 mount_enter_mounted(m, false);
1216                         else
1217                                 mount_enter_dead(m, false);
1218                 }
1219                 break;
1220
1221         case MOUNT_REMOUNTING_SIGTERM:
1222                 if (m->exec_context.send_sigkill) {
1223                         log_warning("%s remounting timed out. Killing.", u->meta.id);
1224                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1225                 } else {
1226                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1227
1228                         if (m->from_proc_self_mountinfo)
1229                                 mount_enter_mounted(m, false);
1230                         else
1231                                 mount_enter_dead(m, false);
1232                 }
1233                 break;
1234
1235         case MOUNT_UNMOUNTING_SIGTERM:
1236                 if (m->exec_context.send_sigkill) {
1237                         log_warning("%s unmounting timed out. Killing.", u->meta.id);
1238                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1239                 } else {
1240                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1241
1242                         if (m->from_proc_self_mountinfo)
1243                                 mount_enter_mounted(m, false);
1244                         else
1245                                 mount_enter_dead(m, false);
1246                 }
1247                 break;
1248
1249         case MOUNT_MOUNTING_SIGKILL:
1250         case MOUNT_REMOUNTING_SIGKILL:
1251         case MOUNT_UNMOUNTING_SIGKILL:
1252                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1253
1254                 if (m->from_proc_self_mountinfo)
1255                         mount_enter_mounted(m, false);
1256                 else
1257                         mount_enter_dead(m, false);
1258                 break;
1259
1260         default:
1261                 assert_not_reached("Timeout at wrong time.");
1262         }
1263 }
1264
1265 static int mount_add_one(
1266                 Manager *m,
1267                 const char *what,
1268                 const char *where,
1269                 const char *options,
1270                 const char *fstype,
1271                 int passno,
1272                 bool from_proc_self_mountinfo,
1273                 bool set_flags) {
1274         int r;
1275         Unit *u;
1276         bool delete;
1277         char *e, *w = NULL, *o = NULL, *f = NULL;
1278         MountParameters *p;
1279
1280         assert(m);
1281         assert(what);
1282         assert(where);
1283         assert(options);
1284         assert(fstype);
1285
1286         assert(!set_flags || from_proc_self_mountinfo);
1287
1288         /* Ignore API mount points. They should never be referenced in
1289          * dependencies ever. */
1290         if (mount_point_is_api(where))
1291                 return 0;
1292         if (mount_point_ignore(where))
1293                 return 0;
1294
1295         if (streq(fstype, "autofs"))
1296                 return 0;
1297
1298         /* probably some kind of swap, ignore */
1299         if (!is_path(where))
1300                 return 0;
1301
1302         if (!(e = unit_name_from_path(where, ".mount")))
1303                 return -ENOMEM;
1304
1305         if (!(u = manager_get_unit(m, e))) {
1306                 delete = true;
1307
1308                 if (!(u = unit_new(m))) {
1309                         free(e);
1310                         return -ENOMEM;
1311                 }
1312
1313                 r = unit_add_name(u, e);
1314                 free(e);
1315
1316                 if (r < 0)
1317                         goto fail;
1318
1319                 if (!(MOUNT(u)->where = strdup(where))) {
1320                         r = -ENOMEM;
1321                         goto fail;
1322                 }
1323
1324                 unit_add_to_load_queue(u);
1325         } else {
1326                 delete = false;
1327                 free(e);
1328         }
1329
1330         if (!(w = strdup(what)) ||
1331             !(o = strdup(options)) ||
1332             !(f = strdup(fstype))) {
1333                 r = -ENOMEM;
1334                 goto fail;
1335         }
1336
1337         if (from_proc_self_mountinfo) {
1338                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1339
1340                 if (set_flags) {
1341                         MOUNT(u)->is_mounted = true;
1342                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1343                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1344                 }
1345
1346                 MOUNT(u)->from_proc_self_mountinfo = true;
1347         } else {
1348                 p = &MOUNT(u)->parameters_etc_fstab;
1349                 MOUNT(u)->from_etc_fstab = true;
1350         }
1351
1352         free(p->what);
1353         p->what = w;
1354
1355         free(p->options);
1356         p->options = o;
1357
1358         free(p->fstype);
1359         p->fstype = f;
1360
1361         p->passno = passno;
1362
1363         unit_add_to_dbus_queue(u);
1364
1365         return 0;
1366
1367 fail:
1368         free(w);
1369         free(o);
1370         free(f);
1371
1372         if (delete && u)
1373                 unit_free(u);
1374
1375         return r;
1376 }
1377
1378 static int mount_find_pri(char *options) {
1379         char *end, *pri;
1380         unsigned long r;
1381
1382         if (!(pri = mount_test_option(options, "pri=")))
1383                 return 0;
1384
1385         pri += 4;
1386
1387         errno = 0;
1388         r = strtoul(pri, &end, 10);
1389
1390         if (errno != 0)
1391                 return -errno;
1392
1393         if (end == pri || (*end != ',' && *end != 0))
1394                 return -EINVAL;
1395
1396         return (int) r;
1397 }
1398
1399 static int mount_load_etc_fstab(Manager *m) {
1400         FILE *f;
1401         int r = 0;
1402         struct mntent* me;
1403
1404         assert(m);
1405
1406         errno = 0;
1407         if (!(f = setmntent("/etc/fstab", "r")))
1408                 return -errno;
1409
1410         while ((me = getmntent(f))) {
1411                 char *where, *what;
1412                 int k;
1413
1414                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1415                         r = -ENOMEM;
1416                         goto finish;
1417                 }
1418
1419                 if (!(where = strdup(me->mnt_dir))) {
1420                         free(what);
1421                         r = -ENOMEM;
1422                         goto finish;
1423                 }
1424
1425                 if (what[0] == '/')
1426                         path_kill_slashes(what);
1427
1428                 if (where[0] == '/')
1429                         path_kill_slashes(where);
1430
1431                 if (streq(me->mnt_type, "swap")) {
1432                         int pri;
1433
1434                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1435                                 k = pri;
1436                         else
1437                                 k = swap_add_one(m,
1438                                                  what,
1439                                                  NULL,
1440                                                  pri,
1441                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1442                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1443                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1444                                                  false);
1445                 } else
1446                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1447
1448                 free(what);
1449                 free(where);
1450
1451                 if (r < 0)
1452                         r = k;
1453         }
1454
1455 finish:
1456
1457         endmntent(f);
1458         return r;
1459 }
1460
1461 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1462         int r = 0;
1463         unsigned i;
1464         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1465
1466         assert(m);
1467
1468         rewind(m->proc_self_mountinfo);
1469
1470         for (i = 1;; i++) {
1471                 int k;
1472
1473                 device = path = options = options2 = fstype = d = p = o = NULL;
1474
1475                 if ((k = fscanf(m->proc_self_mountinfo,
1476                                 "%*s "       /* (1) mount id */
1477                                 "%*s "       /* (2) parent id */
1478                                 "%*s "       /* (3) major:minor */
1479                                 "%*s "       /* (4) root */
1480                                 "%ms "       /* (5) mount point */
1481                                 "%ms"        /* (6) mount options */
1482                                 "%*[^-]"     /* (7) optional fields */
1483                                 "- "         /* (8) separator */
1484                                 "%ms "       /* (9) file system type */
1485                                 "%ms"        /* (10) mount source */
1486                                 "%ms"        /* (11) mount options 2 */
1487                                 "%*[^\n]",   /* some rubbish at the end */
1488                                 &path,
1489                                 &options,
1490                                 &fstype,
1491                                 &device,
1492                                 &options2)) != 5) {
1493
1494                         if (k == EOF)
1495                                 break;
1496
1497                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1498                         goto clean_up;
1499                 }
1500
1501                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1502                         r = -ENOMEM;
1503                         goto finish;
1504                 }
1505
1506                 if (!(d = cunescape(device)) ||
1507                     !(p = cunescape(path))) {
1508                         r = -ENOMEM;
1509                         goto finish;
1510                 }
1511
1512                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1513                         r = k;
1514
1515 clean_up:
1516                 free(device);
1517                 free(path);
1518                 free(options);
1519                 free(options2);
1520                 free(fstype);
1521                 free(d);
1522                 free(p);
1523                 free(o);
1524         }
1525
1526 finish:
1527         free(device);
1528         free(path);
1529         free(options);
1530         free(options2);
1531         free(fstype);
1532         free(d);
1533         free(p);
1534         free(o);
1535
1536         return r;
1537 }
1538
1539 static void mount_shutdown(Manager *m) {
1540         assert(m);
1541
1542         if (m->proc_self_mountinfo) {
1543                 fclose(m->proc_self_mountinfo);
1544                 m->proc_self_mountinfo = NULL;
1545         }
1546 }
1547
1548 static int mount_enumerate(Manager *m) {
1549         int r;
1550         struct epoll_event ev;
1551         assert(m);
1552
1553         if (!m->proc_self_mountinfo) {
1554                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1555                         return -errno;
1556
1557                 m->mount_watch.type = WATCH_MOUNT;
1558                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1559
1560                 zero(ev);
1561                 ev.events = EPOLLPRI;
1562                 ev.data.ptr = &m->mount_watch;
1563
1564                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1565                         return -errno;
1566         }
1567
1568         if ((r = mount_load_etc_fstab(m)) < 0)
1569                 goto fail;
1570
1571         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1572                 goto fail;
1573
1574         return 0;
1575
1576 fail:
1577         mount_shutdown(m);
1578         return r;
1579 }
1580
1581 void mount_fd_event(Manager *m, int events) {
1582         Meta *meta;
1583         int r;
1584
1585         assert(m);
1586         assert(events & EPOLLPRI);
1587
1588         /* The manager calls this for every fd event happening on the
1589          * /proc/self/mountinfo file, which informs us about mounting
1590          * table changes */
1591
1592         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1593                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1594
1595                 /* Reset flags, just in case, for later calls */
1596                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1597                         Mount *mount = (Mount*) meta;
1598
1599                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1600                 }
1601
1602                 return;
1603         }
1604
1605         manager_dispatch_load_queue(m);
1606
1607         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1608                 Mount *mount = (Mount*) meta;
1609
1610                 if (!mount->is_mounted) {
1611                         /* This has just been unmounted. */
1612
1613                         mount->from_proc_self_mountinfo = false;
1614
1615                         switch (mount->state) {
1616
1617                         case MOUNT_MOUNTED:
1618                                 mount_enter_dead(mount, true);
1619                                 break;
1620
1621                         default:
1622                                 mount_set_state(mount, mount->state);
1623                                 break;
1624
1625                         }
1626
1627                 } else if (mount->just_mounted || mount->just_changed) {
1628
1629                         /* New or changed mount entry */
1630
1631                         switch (mount->state) {
1632
1633                         case MOUNT_DEAD:
1634                         case MOUNT_FAILED:
1635                                 mount_enter_mounted(mount, true);
1636                                 break;
1637
1638                         case MOUNT_MOUNTING:
1639                                 mount_enter_mounting_done(mount);
1640                                 break;
1641
1642                         default:
1643                                 /* Nothing really changed, but let's
1644                                  * issue an notification call
1645                                  * nonetheless, in case somebody is
1646                                  * waiting for this. (e.g. file system
1647                                  * ro/rw remounts.) */
1648                                 mount_set_state(mount, mount->state);
1649                                 break;
1650                         }
1651                 }
1652
1653                 /* Reset the flags for later calls */
1654                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1655         }
1656 }
1657
1658 static void mount_reset_failed(Unit *u) {
1659         Mount *m = MOUNT(u);
1660
1661         assert(m);
1662
1663         if (m->state == MOUNT_FAILED)
1664                 mount_set_state(m, MOUNT_DEAD);
1665
1666         m->failure = false;
1667 }
1668
1669 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1670         Mount *m = MOUNT(u);
1671         int r = 0;
1672         Set *pid_set = NULL;
1673
1674         assert(m);
1675
1676         if (who == KILL_MAIN) {
1677                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1678                 return -EINVAL;
1679         }
1680
1681         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1682                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1683                 return -ENOENT;
1684         }
1685
1686         if (m->control_pid > 0)
1687                 if (kill(mode == KILL_PROCESS_GROUP ? -m->control_pid : m->control_pid, signo) < 0)
1688                         r = -errno;
1689
1690         if (mode == KILL_CONTROL_GROUP) {
1691                 int q;
1692
1693                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1694                         return -ENOMEM;
1695
1696                 /* Exclude the control pid from being killed via the cgroup */
1697                 if (m->control_pid > 0)
1698                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1699                                 r = q;
1700                                 goto finish;
1701                         }
1702
1703                 if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0)
1704                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1705                                 r = q;
1706         }
1707
1708 finish:
1709         if (pid_set)
1710                 set_free(pid_set);
1711
1712         return r;
1713 }
1714
1715 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1716         [MOUNT_DEAD] = "dead",
1717         [MOUNT_MOUNTING] = "mounting",
1718         [MOUNT_MOUNTING_DONE] = "mounting-done",
1719         [MOUNT_MOUNTED] = "mounted",
1720         [MOUNT_REMOUNTING] = "remounting",
1721         [MOUNT_UNMOUNTING] = "unmounting",
1722         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1723         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1724         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1725         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1726         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1727         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1728         [MOUNT_FAILED] = "failed"
1729 };
1730
1731 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1732
1733 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1734         [MOUNT_EXEC_MOUNT] = "ExecMount",
1735         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1736         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1737 };
1738
1739 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1740
1741 const UnitVTable mount_vtable = {
1742         .suffix = ".mount",
1743
1744         .no_alias = true,
1745         .no_instances = true,
1746         .no_isolate = true,
1747         .show_status = true,
1748
1749         .init = mount_init,
1750         .load = mount_load,
1751         .done = mount_done,
1752
1753         .coldplug = mount_coldplug,
1754
1755         .dump = mount_dump,
1756
1757         .start = mount_start,
1758         .stop = mount_stop,
1759         .reload = mount_reload,
1760
1761         .kill = mount_kill,
1762
1763         .serialize = mount_serialize,
1764         .deserialize_item = mount_deserialize_item,
1765
1766         .active_state = mount_active_state,
1767         .sub_state_to_string = mount_sub_state_to_string,
1768
1769         .check_gc = mount_check_gc,
1770
1771         .sigchld_event = mount_sigchld_event,
1772         .timer_event = mount_timer_event,
1773
1774         .reset_failed = mount_reset_failed,
1775
1776         .bus_interface = "org.freedesktop.systemd1.Mount",
1777         .bus_message_handler = bus_mount_message_handler,
1778         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1779
1780         .enumerate = mount_enumerate,
1781         .shutdown = mount_shutdown
1782 };