src/mount.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <mntent.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27
  28 #include "unit.h"
  29 #include "mount.h"
  30 #include "load-fragment.h"
  31 #include "load-dropin.h"
  32 #include "log.h"
  33 #include "strv.h"
  34 #include "mount-setup.h"
  35 #include "unit-name.h"
  36 #include "dbus-mount.h"
  37 #include "special.h"
  38
  39 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  40         [MOUNT_DEAD] = UNIT_INACTIVE,
  41         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  42         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  43         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  44         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  45         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  46         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  47         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  48         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  49         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  50         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  51         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  52         [MOUNT_FAILED] = UNIT_FAILED
  53 };
  54
  55 static void mount_init(Unit *u) {
  56         Mount *m = MOUNT(u);
  57
  58         assert(u);
  59         assert(u->meta.load_state == UNIT_STUB);
  60
  61         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  62         m->directory_mode = 0755;
  63
  64         exec_context_init(&m->exec_context);
  65
  66         /* We need to make sure that /bin/mount is always called in
  67          * the same process group as us, so that the autofs kernel
  68          * side doesn't send us another mount request while we are
  69          * already trying to comply its last one. */
  70         m->exec_context.same_pgrp = true;
  71
  72         m->timer_watch.type = WATCH_INVALID;
  73
  74         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  75 }
  76
  77 static void mount_unwatch_control_pid(Mount *m) {
  78         assert(m);
  79
  80         if (m->control_pid <= 0)
  81                 return;
  82
  83         unit_unwatch_pid(UNIT(m), m->control_pid);
  84         m->control_pid = 0;
  85 }
  86
  87 static void mount_parameters_done(MountParameters *p) {
  88         assert(p);
  89
  90         free(p->what);
  91         free(p->options);
  92         free(p->fstype);
  93
  94         p->what = p->options = p->fstype = NULL;
  95 }
  96
  97 static void mount_done(Unit *u) {
  98         Mount *m = MOUNT(u);
  99
 100         assert(m);
 101
 102         free(m->where);
 103         m->where = NULL;
 104
 105         mount_parameters_done(&m->parameters_etc_fstab);
 106         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 107         mount_parameters_done(&m->parameters_fragment);
 108
 109         exec_context_done(&m->exec_context);
 110         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 111         m->control_command = NULL;
 112
 113         mount_unwatch_control_pid(m);
 114
 115         unit_unwatch_timer(u, &m->timer_watch);
 116 }
 117
 118 static int mount_add_mount_links(Mount *m) {
 119         Meta *other;
 120         int r;
 121         MountParameters *pm;
 122
 123         assert(m);
 124
 125         if (m->from_fragment)
 126                 pm = &m->parameters_fragment;
 127         else if (m->from_etc_fstab)
 128                 pm = &m->parameters_etc_fstab;
 129         else
 130                 pm = NULL;
 131
 132         /* Adds in links to other mount points that might lie below or
 133          * above us in the hierarchy */
 134
 135         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) {
 136                 Mount *n = (Mount*) other;
 137                 MountParameters *pn;
 138
 139                 if (n == m)
 140                         continue;
 141
 142                 if (n->meta.load_state != UNIT_LOADED)
 143                         continue;
 144
 145                 if (n->from_fragment)
 146                         pn = &n->parameters_fragment;
 147                 else if (n->from_etc_fstab)
 148                         pn = &n->parameters_etc_fstab;
 149                 else
 150                         pn = NULL;
 151
 152                 if (path_startswith(m->where, n->where)) {
 153
 154                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 155                                 return r;
 156
 157                         if (n->from_etc_fstab || n->from_fragment)
 158                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 159                                         return r;
 160
 161                 } else if (path_startswith(n->where, m->where)) {
 162
 163                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 164                                 return r;
 165
 166                         if (m->from_etc_fstab || m->from_fragment)
 167                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 168                                         return r;
 169
 170                 } else if (pm && path_startswith(pm->what, n->where)) {
 171
 172                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 173                                 return r;
 174
 175                         if (m->from_etc_fstab || m->from_fragment)
 176                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 177                                         return r;
 178
 179                 } else if (pn && path_startswith(pn->what, m->where)) {
 180
 181                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 182                                 return r;
 183
 184                         if (n->from_etc_fstab || n->from_fragment)
 185                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 186                                         return r;
 187                 }
 188         }
 189
 190         return 0;
 191 }
 192
 193 static int mount_add_swap_links(Mount *m) {
 194         Meta *other;
 195         int r;
 196
 197         assert(m);
 198
 199         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP])
 200                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 201                         return r;
 202
 203         return 0;
 204 }
 205
 206 static int mount_add_path_links(Mount *m) {
 207         Meta *other;
 208         int r;
 209
 210         assert(m);
 211
 212         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH])
 213                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 214                         return r;
 215
 216         return 0;
 217 }
 218
 219 static int mount_add_automount_links(Mount *m) {
 220         Meta *other;
 221         int r;
 222
 223         assert(m);
 224
 225         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT])
 226                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 227                         return r;
 228
 229         return 0;
 230 }
 231
 232 static int mount_add_socket_links(Mount *m) {
 233         Meta *other;
 234         int r;
 235
 236         assert(m);
 237
 238         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET])
 239                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 240                         return r;
 241
 242         return 0;
 243 }
 244
 245 static char* mount_test_option(const char *haystack, const char *needle) {
 246         struct mntent me;
 247
 248         assert(needle);
 249
 250         /* Like glibc's hasmntopt(), but works on a string, not a
 251          * struct mntent */
 252
 253         if (!haystack)
 254                 return false;
 255
 256         zero(me);
 257         me.mnt_opts = (char*) haystack;
 258
 259         return hasmntopt(&me, needle);
 260 }
 261
 262 static int mount_add_target_links(Mount *m) {
 263         const char *target, *after = NULL;
 264         MountParameters *p;
 265         Unit *tu;
 266         int r;
 267         bool noauto, handle, automount, user;
 268
 269         assert(m);
 270
 271         if (m->from_fragment)
 272                 p = &m->parameters_fragment;
 273         else if (m->from_etc_fstab)
 274                 p = &m->parameters_etc_fstab;
 275         else
 276                 return 0;
 277
 278         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 279         user = mount_test_option(p->options, "user") || mount_test_option(p->options, "users");
 280         handle = !!mount_test_option(p->options, "comment=systemd.mount") ||
 281                 m->meta.manager->mount_auto;
 282         automount = !!mount_test_option(p->options, "comment=systemd.automount");
 283
 284         if (mount_test_option(p->options, "_netdev") ||
 285             (p->fstype && fstype_is_network(p->fstype))) {
 286                 target = SPECIAL_REMOTE_FS_TARGET;
 287
 288                 if (m->meta.manager->running_as == MANAGER_SYSTEM)
 289                         after = SPECIAL_NETWORK_TARGET;
 290         } else
 291                 target = SPECIAL_LOCAL_FS_TARGET;
 292
 293         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 294                 return r;
 295
 296         if (after)
 297                 if ((r = unit_add_dependency_by_name(tu, UNIT_AFTER, after, NULL, true)) < 0)
 298                         return r;
 299
 300         if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) {
 301                 Unit *am;
 302
 303                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 304                         return r;
 305
 306                 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 307         } else {
 308
 309                 /* Automatically add mount points that aren't natively
 310                  * configured to local-fs.target */
 311                 if (!noauto &&
 312                     handle &&
 313                     !m->from_fragment)
 314                         if (user || m->meta.manager->running_as == MANAGER_SYSTEM)
 315                                 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 316                                         return r;
 317
 318                 return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true);
 319         }
 320 }
 321
 322 static bool mount_is_bind(MountParameters *p) {
 323         assert(p);
 324
 325         if (p->fstype && streq(p->fstype, "bind"))
 326                 return true;
 327
 328         if (mount_test_option(p->options, "bind"))
 329                 return true;
 330
 331         return false;
 332 }
 333
 334 static int mount_add_device_links(Mount *m) {
 335         MountParameters *p;
 336         int r;
 337
 338         assert(m);
 339
 340         if (m->from_fragment)
 341                 p = &m->parameters_fragment;
 342         else if (m->from_etc_fstab)
 343                 p = &m->parameters_etc_fstab;
 344         else
 345                 return 0;
 346
 347         if (!p->what)
 348                 return 0;
 349
 350         if (!mount_is_bind(p) && !path_equal(m->where, "/")) {
 351                 bool nofail, noauto;
 352
 353                 noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 354                 nofail = !!mount_test_option(p->options, "nofail");
 355
 356                 if ((r = unit_add_node_link(UNIT(m), p->what,
 357                                             !noauto && nofail &&
 358                                             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
 359                         return r;
 360         }
 361
 362         if (p->passno > 0 &&
 363             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
 364             !path_equal(m->where, "/")) {
 365                 char *name;
 366                 Unit *fsck;
 367                 /* Let's add in the fsck service */
 368
 369                 /* aka SPECIAL_FSCK_SERVICE */
 370                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 371                         return -ENOMEM;
 372
 373                 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
 374                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 375                         free(name);
 376                         return r;
 377                 }
 378
 379                 free(name);
 380
 381                 SERVICE(fsck)->fsck_passno = p->passno;
 382
 383                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_WANTS, fsck, true)) < 0)
 384                         return r;
 385         }
 386
 387         return 0;
 388 }
 389
 390 static int mount_add_default_dependencies(Mount *m) {
 391         int r;
 392
 393         assert(m);
 394
 395         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 396             !path_equal(m->where, "/")) {
 397
 398                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, SPECIAL_QUOTACHECK_TARGET, NULL, true)) < 0)
 399                         return r;
 400
 401                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 402                         return r;
 403         }
 404
 405         return 0;
 406 }
 407
 408 static int mount_verify(Mount *m) {
 409         bool b;
 410         char *e;
 411         assert(m);
 412
 413         if (m->meta.load_state != UNIT_LOADED)
 414                 return 0;
 415
 416         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 417                 return -ENOENT;
 418
 419         if (!(e = unit_name_from_path(m->where, ".mount")))
 420                 return -ENOMEM;
 421
 422         b = unit_has_name(UNIT(m), e);
 423         free(e);
 424
 425         if (!b) {
 426                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 427                 return -EINVAL;
 428         }
 429
 430         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 431                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 432                 return -EBADMSG;
 433         }
 434
 435         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 436                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 437                 return -EINVAL;
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int mount_load(Unit *u) {
 444         Mount *m = MOUNT(u);
 445         int r;
 446
 447         assert(u);
 448         assert(u->meta.load_state == UNIT_STUB);
 449
 450         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 451                 return r;
 452
 453         /* This is a new unit? Then let's add in some extras */
 454         if (u->meta.load_state == UNIT_LOADED) {
 455                 if (m->meta.fragment_path)
 456                         m->from_fragment = true;
 457
 458                 if (!m->where)
 459                         if (!(m->where = unit_name_to_path(u->meta.id)))
 460                                 return -ENOMEM;
 461
 462                 path_kill_slashes(m->where);
 463
 464                 if (!m->meta.description)
 465                         if ((r = unit_set_description(u, m->where)) < 0)
 466                                 return r;
 467
 468                 if ((r = mount_add_device_links(m)) < 0)
 469                         return r;
 470
 471                 if ((r = mount_add_mount_links(m)) < 0)
 472                         return r;
 473
 474                 if ((r = mount_add_socket_links(m)) < 0)
 475                         return r;
 476
 477                 if ((r = mount_add_swap_links(m)) < 0)
 478                         return r;
 479
 480                 if ((r = mount_add_path_links(m)) < 0)
 481                         return r;
 482
 483                 if ((r = mount_add_automount_links(m)) < 0)
 484                         return r;
 485
 486                 if ((r = mount_add_target_links(m)) < 0)
 487                         return r;
 488
 489                 if ((r = unit_add_default_cgroup(u)) < 0)
 490                         return r;
 491
 492                 if (m->meta.default_dependencies)
 493                         if ((r = mount_add_default_dependencies(m)) < 0)
 494                                 return r;
 495         }
 496
 497         return mount_verify(m);
 498 }
 499
 500 static int mount_notify_automount(Mount *m, int status) {
 501         Unit *p;
 502         int r;
 503
 504         assert(m);
 505
 506         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 507                 return r == -ENOENT ? 0 : r;
 508
 509         return automount_send_ready(AUTOMOUNT(p), status);
 510 }
 511
 512 static void mount_set_state(Mount *m, MountState state) {
 513         MountState old_state;
 514         assert(m);
 515
 516         old_state = m->state;
 517         m->state = state;
 518
 519         if (state != MOUNT_MOUNTING &&
 520             state != MOUNT_MOUNTING_DONE &&
 521             state != MOUNT_REMOUNTING &&
 522             state != MOUNT_UNMOUNTING &&
 523             state != MOUNT_MOUNTING_SIGTERM &&
 524             state != MOUNT_MOUNTING_SIGKILL &&
 525             state != MOUNT_UNMOUNTING_SIGTERM &&
 526             state != MOUNT_UNMOUNTING_SIGKILL &&
 527             state != MOUNT_REMOUNTING_SIGTERM &&
 528             state != MOUNT_REMOUNTING_SIGKILL) {
 529                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 530                 mount_unwatch_control_pid(m);
 531                 m->control_command = NULL;
 532                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 533         }
 534
 535         if (state == MOUNT_MOUNTED ||
 536             state == MOUNT_REMOUNTING)
 537                 mount_notify_automount(m, 0);
 538         else if (state == MOUNT_DEAD ||
 539                  state == MOUNT_UNMOUNTING ||
 540                  state == MOUNT_MOUNTING_SIGTERM ||
 541                  state == MOUNT_MOUNTING_SIGKILL ||
 542                  state == MOUNT_REMOUNTING_SIGTERM ||
 543                  state == MOUNT_REMOUNTING_SIGKILL ||
 544                  state == MOUNT_UNMOUNTING_SIGTERM ||
 545                  state == MOUNT_UNMOUNTING_SIGKILL ||
 546                  state == MOUNT_FAILED)
 547                 mount_notify_automount(m, -ENODEV);
 548
 549         if (state != old_state)
 550                 log_debug("%s changed %s -> %s",
 551                           m->meta.id,
 552                           mount_state_to_string(old_state),
 553                           mount_state_to_string(state));
 554
 555         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 556 }
 557
 558 static int mount_coldplug(Unit *u) {
 559         Mount *m = MOUNT(u);
 560         MountState new_state = MOUNT_DEAD;
 561         int r;
 562
 563         assert(m);
 564         assert(m->state == MOUNT_DEAD);
 565
 566         if (m->deserialized_state != m->state)
 567                 new_state = m->deserialized_state;
 568         else if (m->from_proc_self_mountinfo)
 569                 new_state = MOUNT_MOUNTED;
 570
 571         if (new_state != m->state) {
 572
 573                 if (new_state == MOUNT_MOUNTING ||
 574                     new_state == MOUNT_MOUNTING_DONE ||
 575                     new_state == MOUNT_REMOUNTING ||
 576                     new_state == MOUNT_UNMOUNTING ||
 577                     new_state == MOUNT_MOUNTING_SIGTERM ||
 578                     new_state == MOUNT_MOUNTING_SIGKILL ||
 579                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 580                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 581                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 582                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 583
 584                         if (m->control_pid <= 0)
 585                                 return -EBADMSG;
 586
 587                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 588                                 return r;
 589
 590                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 591                                 return r;
 592                 }
 593
 594                 mount_set_state(m, new_state);
 595         }
 596
 597         return 0;
 598 }
 599
 600 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 601         Mount *m = MOUNT(u);
 602         MountParameters *p;
 603
 604         assert(m);
 605         assert(f);
 606
 607         if (m->from_proc_self_mountinfo)
 608                 p = &m->parameters_proc_self_mountinfo;
 609         else if (m->from_fragment)
 610                 p = &m->parameters_fragment;
 611         else
 612                 p = &m->parameters_etc_fstab;
 613
 614         fprintf(f,
 615                 "%sMount State: %s\n"
 616                 "%sWhere: %s\n"
 617                 "%sWhat: %s\n"
 618                 "%sFile System Type: %s\n"
 619                 "%sOptions: %s\n"
 620                 "%sFrom /etc/fstab: %s\n"
 621                 "%sFrom /proc/self/mountinfo: %s\n"
 622                 "%sFrom fragment: %s\n"
 623                 "%sDirectoryMode: %04o\n",
 624                 prefix, mount_state_to_string(m->state),
 625                 prefix, m->where,
 626                 prefix, strna(p->what),
 627                 prefix, strna(p->fstype),
 628                 prefix, strna(p->options),
 629                 prefix, yes_no(m->from_etc_fstab),
 630                 prefix, yes_no(m->from_proc_self_mountinfo),
 631                 prefix, yes_no(m->from_fragment),
 632                 prefix, m->directory_mode);
 633
 634         if (m->control_pid > 0)
 635                 fprintf(f,
 636                         "%sControl PID: %lu\n",
 637                         prefix, (unsigned long) m->control_pid);
 638
 639         exec_context_dump(&m->exec_context, f, prefix);
 640 }
 641
 642 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 643         pid_t pid;
 644         int r;
 645
 646         assert(m);
 647         assert(c);
 648         assert(_pid);
 649
 650         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 651                 goto fail;
 652
 653         if ((r = exec_spawn(c,
 654                             NULL,
 655                             &m->exec_context,
 656                             NULL, 0,
 657                             m->meta.manager->environment,
 658                             true,
 659                             true,
 660                             true,
 661                             m->meta.manager->confirm_spawn,
 662                             m->meta.cgroup_bondings,
 663                             &pid)) < 0)
 664                 goto fail;
 665
 666         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 667                 /* FIXME: we need to do something here */
 668                 goto fail;
 669
 670         *_pid = pid;
 671
 672         return 0;
 673
 674 fail:
 675         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 676
 677         return r;
 678 }
 679
 680 static void mount_enter_dead(Mount *m, bool success) {
 681         assert(m);
 682
 683         if (!success)
 684                 m->failure = true;
 685
 686         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 687 }
 688
 689 static void mount_enter_mounted(Mount *m, bool success) {
 690         assert(m);
 691
 692         if (!success)
 693                 m->failure = true;
 694
 695         mount_set_state(m, MOUNT_MOUNTED);
 696 }
 697
 698 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 699         int r;
 700         Set *pid_set = NULL;
 701         bool wait_for_exit = false;
 702
 703         assert(m);
 704
 705         if (!success)
 706                 m->failure = true;
 707
 708         if (m->exec_context.kill_mode != KILL_NONE) {
 709                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 710                            state == MOUNT_UNMOUNTING_SIGTERM ||
 711                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 712
 713                 if (m->control_pid > 0) {
 714                         if (kill(m->exec_context.kill_mode == KILL_PROCESS_GROUP ?
 715                                  -m->control_pid :
 716                                  m->control_pid, sig) < 0 && errno != ESRCH)
 717
 718                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 719                         else
 720                                 wait_for_exit = true;
 721                 }
 722
 723                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 724
 725                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 726                                 r = -ENOMEM;
 727                                 goto fail;
 728                         }
 729
 730                         /* Exclude the control pid from being killed via the cgroup */
 731                         if (m->control_pid > 0)
 732                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 733                                         goto fail;
 734
 735                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, pid_set)) < 0) {
 736                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 737                                         log_warning("Failed to kill control group: %s", strerror(-r));
 738                         } else if (r > 0)
 739                                 wait_for_exit = true;
 740
 741                         set_free(pid_set);
 742                 }
 743         }
 744
 745         if (wait_for_exit) {
 746                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 747                         goto fail;
 748
 749                 mount_set_state(m, state);
 750         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 751                 mount_enter_mounted(m, true);
 752         else
 753                 mount_enter_dead(m, true);
 754
 755         return;
 756
 757 fail:
 758         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 759
 760         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 761                 mount_enter_mounted(m, false);
 762         else
 763                 mount_enter_dead(m, false);
 764
 765         if (pid_set)
 766                 set_free(pid_set);
 767 }
 768
 769 static void mount_enter_unmounting(Mount *m, bool success) {
 770         int r;
 771
 772         assert(m);
 773
 774         if (!success)
 775                 m->failure = true;
 776
 777         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 778         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 779
 780         if ((r = exec_command_set(
 781                              m->control_command,
 782                              "/bin/umount",
 783                              m->where,
 784                              NULL)) < 0)
 785                 goto fail;
 786
 787         mount_unwatch_control_pid(m);
 788
 789         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 790                 goto fail;
 791
 792         mount_set_state(m, MOUNT_UNMOUNTING);
 793
 794         return;
 795
 796 fail:
 797         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 798         mount_enter_mounted(m, false);
 799 }
 800
 801 static void mount_enter_mounting(Mount *m) {
 802         int r;
 803
 804         assert(m);
 805
 806         m->control_command_id = MOUNT_EXEC_MOUNT;
 807         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 808
 809         mkdir_p(m->where, m->directory_mode);
 810
 811         if (m->from_fragment)
 812                 r = exec_command_set(
 813                                 m->control_command,
 814                                 "/bin/mount",
 815                                 m->parameters_fragment.what,
 816                                 m->where,
 817                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 818                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 819                                 NULL);
 820         else if (m->from_etc_fstab)
 821                 r = exec_command_set(
 822                                 m->control_command,
 823                                 "/bin/mount",
 824                                 m->where,
 825                                 NULL);
 826         else
 827                 r = -ENOENT;
 828
 829         if (r < 0)
 830                 goto fail;
 831
 832         mount_unwatch_control_pid(m);
 833
 834         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 835                 goto fail;
 836
 837         mount_set_state(m, MOUNT_MOUNTING);
 838
 839         return;
 840
 841 fail:
 842         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 843         mount_enter_dead(m, false);
 844 }
 845
 846 static void mount_enter_mounting_done(Mount *m) {
 847         assert(m);
 848
 849         mount_set_state(m, MOUNT_MOUNTING_DONE);
 850 }
 851
 852 static void mount_enter_remounting(Mount *m, bool success) {
 853         int r;
 854
 855         assert(m);
 856
 857         if (!success)
 858                 m->failure = true;
 859
 860         m->control_command_id = MOUNT_EXEC_REMOUNT;
 861         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 862
 863         if (m->from_fragment) {
 864                 char *buf = NULL;
 865                 const char *o;
 866
 867                 if (m->parameters_fragment.options) {
 868                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 869                                 r = -ENOMEM;
 870                                 goto fail;
 871                         }
 872
 873                         o = buf;
 874                 } else
 875                         o = "remount";
 876
 877                 r = exec_command_set(
 878                                 m->control_command,
 879                                 "/bin/mount",
 880                                 m->parameters_fragment.what,
 881                                 m->where,
 882                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 883                                 "-o", o,
 884                                 NULL);
 885
 886                 free(buf);
 887         } else if (m->from_etc_fstab)
 888                 r = exec_command_set(
 889                                 m->control_command,
 890                                 "/bin/mount",
 891                                 m->where,
 892                                 "-o", "remount",
 893                                 NULL);
 894         else
 895                 r = -ENOENT;
 896
 897         if (r < 0)
 898                 goto fail;
 899
 900         mount_unwatch_control_pid(m);
 901
 902         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 903                 goto fail;
 904
 905         mount_set_state(m, MOUNT_REMOUNTING);
 906
 907         return;
 908
 909 fail:
 910         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 911         mount_enter_mounted(m, false);
 912 }
 913
 914 static int mount_start(Unit *u) {
 915         Mount *m = MOUNT(u);
 916
 917         assert(m);
 918
 919         /* We cannot fulfill this request right now, try again later
 920          * please! */
 921         if (m->state == MOUNT_UNMOUNTING ||
 922             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 923             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 924             m->state == MOUNT_MOUNTING_SIGTERM ||
 925             m->state == MOUNT_MOUNTING_SIGKILL)
 926                 return -EAGAIN;
 927
 928         /* Already on it! */
 929         if (m->state == MOUNT_MOUNTING)
 930                 return 0;
 931
 932         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
 933
 934         m->failure = false;
 935         mount_enter_mounting(m);
 936         return 0;
 937 }
 938
 939 static int mount_stop(Unit *u) {
 940         Mount *m = MOUNT(u);
 941
 942         assert(m);
 943
 944         /* Already on it */
 945         if (m->state == MOUNT_UNMOUNTING ||
 946             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 947             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 948             m->state == MOUNT_MOUNTING_SIGTERM ||
 949             m->state == MOUNT_MOUNTING_SIGKILL)
 950                 return 0;
 951
 952         assert(m->state == MOUNT_MOUNTING ||
 953                m->state == MOUNT_MOUNTING_DONE ||
 954                m->state == MOUNT_MOUNTED ||
 955                m->state == MOUNT_REMOUNTING ||
 956                m->state == MOUNT_REMOUNTING_SIGTERM ||
 957                m->state == MOUNT_REMOUNTING_SIGKILL);
 958
 959         mount_enter_unmounting(m, true);
 960         return 0;
 961 }
 962
 963 static int mount_reload(Unit *u) {
 964         Mount *m = MOUNT(u);
 965
 966         assert(m);
 967
 968         if (m->state == MOUNT_MOUNTING_DONE)
 969                 return -EAGAIN;
 970
 971         assert(m->state == MOUNT_MOUNTED);
 972
 973         mount_enter_remounting(m, true);
 974         return 0;
 975 }
 976
 977 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
 978         Mount *m = MOUNT(u);
 979
 980         assert(m);
 981         assert(f);
 982         assert(fds);
 983
 984         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
 985         unit_serialize_item(u, f, "failure", yes_no(m->failure));
 986
 987         if (m->control_pid > 0)
 988                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
 989
 990         if (m->control_command_id >= 0)
 991                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
 992
 993         return 0;
 994 }
 995
 996 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 997         Mount *m = MOUNT(u);
 998
 999         assert(u);
1000         assert(key);
1001         assert(value);
1002         assert(fds);
1003
1004         if (streq(key, "state")) {
1005                 MountState state;
1006
1007                 if ((state = mount_state_from_string(value)) < 0)
1008                         log_debug("Failed to parse state value %s", value);
1009                 else
1010                         m->deserialized_state = state;
1011         } else if (streq(key, "failure")) {
1012                 int b;
1013
1014                 if ((b = parse_boolean(value)) < 0)
1015                         log_debug("Failed to parse failure value %s", value);
1016                 else
1017                         m->failure = b || m->failure;
1018
1019         } else if (streq(key, "control-pid")) {
1020                 pid_t pid;
1021
1022                 if (parse_pid(value, &pid) < 0)
1023                         log_debug("Failed to parse control-pid value %s", value);
1024                 else
1025                         m->control_pid = pid;
1026         } else if (streq(key, "control-command")) {
1027                 MountExecCommand id;
1028
1029                 if ((id = mount_exec_command_from_string(value)) < 0)
1030                         log_debug("Failed to parse exec-command value %s", value);
1031                 else {
1032                         m->control_command_id = id;
1033                         m->control_command = m->exec_command + id;
1034                 }
1035
1036         } else
1037                 log_debug("Unknown serialization key '%s'", key);
1038
1039         return 0;
1040 }
1041
1042 static UnitActiveState mount_active_state(Unit *u) {
1043         assert(u);
1044
1045         return state_translation_table[MOUNT(u)->state];
1046 }
1047
1048 static const char *mount_sub_state_to_string(Unit *u) {
1049         assert(u);
1050
1051         return mount_state_to_string(MOUNT(u)->state);
1052 }
1053
1054 static bool mount_check_gc(Unit *u) {
1055         Mount *m = MOUNT(u);
1056
1057         assert(m);
1058
1059         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1060 }
1061
1062 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1063         Mount *m = MOUNT(u);
1064         bool success;
1065
1066         assert(m);
1067         assert(pid >= 0);
1068
1069         if (pid != m->control_pid)
1070                 return;
1071
1072         m->control_pid = 0;
1073
1074         success = is_clean_exit(code, status);
1075         m->failure = m->failure || !success;
1076
1077         if (m->control_command) {
1078                 exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id);
1079                 m->control_command = NULL;
1080                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1081         }
1082
1083         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1084                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1085
1086         /* Note that mount(8) returning and the kernel sending us a
1087          * mount table change event might happen out-of-order. If an
1088          * operation succeed we assume the kernel will follow soon too
1089          * and already change into the resulting state.  If it fails
1090          * we check if the kernel still knows about the mount. and
1091          * change state accordingly. */
1092
1093         switch (m->state) {
1094
1095         case MOUNT_MOUNTING:
1096         case MOUNT_MOUNTING_DONE:
1097         case MOUNT_MOUNTING_SIGKILL:
1098         case MOUNT_MOUNTING_SIGTERM:
1099         case MOUNT_REMOUNTING:
1100         case MOUNT_REMOUNTING_SIGKILL:
1101         case MOUNT_REMOUNTING_SIGTERM:
1102
1103                 if (success)
1104                         mount_enter_mounted(m, true);
1105                 else if (m->from_proc_self_mountinfo)
1106                         mount_enter_mounted(m, false);
1107                 else
1108                         mount_enter_dead(m, false);
1109                 break;
1110
1111         case MOUNT_UNMOUNTING:
1112         case MOUNT_UNMOUNTING_SIGKILL:
1113         case MOUNT_UNMOUNTING_SIGTERM:
1114
1115                 if (success)
1116                         mount_enter_dead(m, true);
1117                 else if (m->from_proc_self_mountinfo)
1118                         mount_enter_mounted(m, false);
1119                 else
1120                         mount_enter_dead(m, false);
1121                 break;
1122
1123         default:
1124                 assert_not_reached("Uh, control process died at wrong time.");
1125         }
1126
1127         /* Notify clients about changed exit status */
1128         unit_add_to_dbus_queue(u);
1129 }
1130
1131 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1132         Mount *m = MOUNT(u);
1133
1134         assert(m);
1135         assert(elapsed == 1);
1136         assert(w == &m->timer_watch);
1137
1138         switch (m->state) {
1139
1140         case MOUNT_MOUNTING:
1141         case MOUNT_MOUNTING_DONE:
1142                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1143                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1144                 break;
1145
1146         case MOUNT_REMOUNTING:
1147                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1148                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
1149                 break;
1150
1151         case MOUNT_UNMOUNTING:
1152                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1153                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1154                 break;
1155
1156         case MOUNT_MOUNTING_SIGTERM:
1157                 log_warning("%s mounting timed out. Killing.", u->meta.id);
1158                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1159                 break;
1160
1161         case MOUNT_REMOUNTING_SIGTERM:
1162                 log_warning("%s remounting timed out. Killing.", u->meta.id);
1163                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1164                 break;
1165
1166         case MOUNT_UNMOUNTING_SIGTERM:
1167                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
1168                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1169                 break;
1170
1171         case MOUNT_MOUNTING_SIGKILL:
1172         case MOUNT_REMOUNTING_SIGKILL:
1173         case MOUNT_UNMOUNTING_SIGKILL:
1174                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1175
1176                 if (m->from_proc_self_mountinfo)
1177                         mount_enter_mounted(m, false);
1178                 else
1179                         mount_enter_dead(m, false);
1180                 break;
1181
1182         default:
1183                 assert_not_reached("Timeout at wrong time.");
1184         }
1185 }
1186
1187 static int mount_add_one(
1188                 Manager *m,
1189                 const char *what,
1190                 const char *where,
1191                 const char *options,
1192                 const char *fstype,
1193                 int passno,
1194                 bool from_proc_self_mountinfo,
1195                 bool set_flags) {
1196         int r;
1197         Unit *u;
1198         bool delete;
1199         char *e, *w = NULL, *o = NULL, *f = NULL;
1200         MountParameters *p;
1201
1202         assert(m);
1203         assert(what);
1204         assert(where);
1205         assert(options);
1206         assert(fstype);
1207
1208         assert(!set_flags || from_proc_self_mountinfo);
1209
1210         /* Ignore API mount points. They should never be referenced in
1211          * dependencies ever. */
1212         if (mount_point_is_api(where))
1213                 return 0;
1214
1215         if (streq(fstype, "autofs"))
1216                 return 0;
1217
1218         /* probably some kind of swap, ignore */
1219         if (!is_path(where))
1220                 return 0;
1221
1222         if (!(e = unit_name_from_path(where, ".mount")))
1223                 return -ENOMEM;
1224
1225         if (!(u = manager_get_unit(m, e))) {
1226                 delete = true;
1227
1228                 if (!(u = unit_new(m))) {
1229                         free(e);
1230                         return -ENOMEM;
1231                 }
1232
1233                 r = unit_add_name(u, e);
1234                 free(e);
1235
1236                 if (r < 0)
1237                         goto fail;
1238
1239                 if (!(MOUNT(u)->where = strdup(where))) {
1240                         r = -ENOMEM;
1241                         goto fail;
1242                 }
1243
1244                 unit_add_to_load_queue(u);
1245         } else {
1246                 delete = false;
1247                 free(e);
1248         }
1249
1250         if (!(w = strdup(what)) ||
1251             !(o = strdup(options)) ||
1252             !(f = strdup(fstype))) {
1253                 r = -ENOMEM;
1254                 goto fail;
1255         }
1256
1257         if (from_proc_self_mountinfo) {
1258                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1259
1260                 if (set_flags) {
1261                         MOUNT(u)->is_mounted = true;
1262                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1263                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1264                 }
1265
1266                 MOUNT(u)->from_proc_self_mountinfo = true;
1267         } else {
1268                 p = &MOUNT(u)->parameters_etc_fstab;
1269                 MOUNT(u)->from_etc_fstab = true;
1270         }
1271
1272         free(p->what);
1273         p->what = w;
1274
1275         free(p->options);
1276         p->options = o;
1277
1278         free(p->fstype);
1279         p->fstype = f;
1280
1281         p->passno = passno;
1282
1283         unit_add_to_dbus_queue(u);
1284
1285         return 0;
1286
1287 fail:
1288         free(w);
1289         free(o);
1290         free(f);
1291
1292         if (delete && u)
1293                 unit_free(u);
1294
1295         return r;
1296 }
1297
1298 static char *fstab_node_to_udev_node(char *p) {
1299         char *dn, *t, *u;
1300         int r;
1301
1302         /* FIXME: to follow udev's logic 100% we need to leave valid
1303          * UTF8 chars unescaped */
1304
1305         if (startswith(p, "LABEL=")) {
1306
1307                 if (!(u = unquote(p+6, "\"\'")))
1308                         return NULL;
1309
1310                 t = xescape(u, "/ ");
1311                 free(u);
1312
1313                 if (!t)
1314                         return NULL;
1315
1316                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
1317                 free(t);
1318
1319                 if (r < 0)
1320                         return NULL;
1321
1322                 return dn;
1323         }
1324
1325         if (startswith(p, "UUID=")) {
1326
1327                 if (!(u = unquote(p+5, "\"\'")))
1328                         return NULL;
1329
1330                 t = xescape(u, "/ ");
1331                 free(u);
1332
1333                 if (!t)
1334                         return NULL;
1335
1336                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
1337                 free(t);
1338
1339                 if (r < 0)
1340                         return NULL;
1341
1342                 return dn;
1343         }
1344
1345         return strdup(p);
1346 }
1347
1348 static int mount_find_pri(char *options) {
1349         char *end, *pri;
1350         unsigned long r;
1351
1352         if (!(pri = mount_test_option(options, "pri=")))
1353                 return 0;
1354
1355         pri += 4;
1356
1357         errno = 0;
1358         r = strtoul(pri, &end, 10);
1359
1360         if (errno != 0)
1361                 return -errno;
1362
1363         if (end == pri || (*end != ',' && *end != 0))
1364                 return -EINVAL;
1365
1366         return (int) r;
1367 }
1368
1369 static int mount_load_etc_fstab(Manager *m) {
1370         FILE *f;
1371         int r = 0;
1372         struct mntent* me;
1373
1374         assert(m);
1375
1376         errno = 0;
1377         if (!(f = setmntent("/etc/fstab", "r")))
1378                 return -errno;
1379
1380         while ((me = getmntent(f))) {
1381                 char *where, *what;
1382                 int k;
1383
1384                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1385                         r = -ENOMEM;
1386                         goto finish;
1387                 }
1388
1389                 if (!(where = strdup(me->mnt_dir))) {
1390                         free(what);
1391                         r = -ENOMEM;
1392                         goto finish;
1393                 }
1394
1395                 if (what[0] == '/')
1396                         path_kill_slashes(what);
1397
1398                 if (where[0] == '/')
1399                         path_kill_slashes(where);
1400
1401                 if (streq(me->mnt_type, "swap")) {
1402                         int pri;
1403
1404                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1405                                 k = pri;
1406                         else
1407                                 k = swap_add_one(m,
1408                                                  what,
1409                                                  NULL,
1410                                                  pri,
1411                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1412                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1413                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1414                                                  false);
1415                 } else
1416                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1417
1418                 free(what);
1419                 free(where);
1420
1421                 if (r < 0)
1422                         r = k;
1423         }
1424
1425 finish:
1426
1427         endmntent(f);
1428         return r;
1429 }
1430
1431 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1432         int r = 0;
1433         unsigned i;
1434         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1435
1436         assert(m);
1437
1438         rewind(m->proc_self_mountinfo);
1439
1440         for (i = 1;; i++) {
1441                 int k;
1442
1443                 device = path = options = options2 = fstype = d = p = o = NULL;
1444
1445                 if ((k = fscanf(m->proc_self_mountinfo,
1446                                 "%*s "       /* (1) mount id */
1447                                 "%*s "       /* (2) parent id */
1448                                 "%*s "       /* (3) major:minor */
1449                                 "%*s "       /* (4) root */
1450                                 "%ms "       /* (5) mount point */
1451                                 "%ms"        /* (6) mount options */
1452                                 "%*[^-]"     /* (7) optional fields */
1453                                 "- "         /* (8) separator */
1454                                 "%ms "       /* (9) file system type */
1455                                 "%ms"        /* (10) mount source */
1456                                 "%ms"        /* (11) mount options 2 */
1457                                 "%*[^\n]",   /* some rubbish at the end */
1458                                 &path,
1459                                 &options,
1460                                 &fstype,
1461                                 &device,
1462                                 &options2)) != 5) {
1463
1464                         if (k == EOF)
1465                                 break;
1466
1467                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1468                         goto clean_up;
1469                 }
1470
1471                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1472                         r = -ENOMEM;
1473                         goto finish;
1474                 }
1475
1476                 if (!(d = cunescape(device)) ||
1477                     !(p = cunescape(path))) {
1478                         r = -ENOMEM;
1479                         goto finish;
1480                 }
1481
1482                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1483                         r = k;
1484
1485 clean_up:
1486                 free(device);
1487                 free(path);
1488                 free(options);
1489                 free(options2);
1490                 free(fstype);
1491                 free(d);
1492                 free(p);
1493                 free(o);
1494         }
1495
1496 finish:
1497         free(device);
1498         free(path);
1499         free(options);
1500         free(options2);
1501         free(fstype);
1502         free(d);
1503         free(p);
1504         free(o);
1505
1506         return r;
1507 }
1508
1509 static void mount_shutdown(Manager *m) {
1510         assert(m);
1511
1512         if (m->proc_self_mountinfo) {
1513                 fclose(m->proc_self_mountinfo);
1514                 m->proc_self_mountinfo = NULL;
1515         }
1516 }
1517
1518 static int mount_enumerate(Manager *m) {
1519         int r;
1520         struct epoll_event ev;
1521         assert(m);
1522
1523         if (!m->proc_self_mountinfo) {
1524                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1525                         return -errno;
1526
1527                 m->mount_watch.type = WATCH_MOUNT;
1528                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1529
1530                 zero(ev);
1531                 ev.events = EPOLLPRI;
1532                 ev.data.ptr = &m->mount_watch;
1533
1534                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1535                         return -errno;
1536         }
1537
1538         if ((r = mount_load_etc_fstab(m)) < 0)
1539                 goto fail;
1540
1541         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1542                 goto fail;
1543
1544         return 0;
1545
1546 fail:
1547         mount_shutdown(m);
1548         return r;
1549 }
1550
1551 void mount_fd_event(Manager *m, int events) {
1552         Meta *meta;
1553         int r;
1554
1555         assert(m);
1556         assert(events & EPOLLPRI);
1557
1558         /* The manager calls this for every fd event happening on the
1559          * /proc/self/mountinfo file, which informs us about mounting
1560          * table changes */
1561
1562         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1563                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1564
1565                 /* Reset flags, just in case, for later calls */
1566                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1567                         Mount *mount = (Mount*) meta;
1568
1569                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1570                 }
1571
1572                 return;
1573         }
1574
1575         manager_dispatch_load_queue(m);
1576
1577         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1578                 Mount *mount = (Mount*) meta;
1579
1580                 if (!mount->is_mounted) {
1581                         /* This has just been unmounted. */
1582
1583                         mount->from_proc_self_mountinfo = false;
1584
1585                         switch (mount->state) {
1586
1587                         case MOUNT_MOUNTED:
1588                                 mount_enter_dead(mount, true);
1589                                 break;
1590
1591                         default:
1592                                 mount_set_state(mount, mount->state);
1593                                 break;
1594
1595                         }
1596
1597                 } else if (mount->just_mounted || mount->just_changed) {
1598
1599                         /* New or changed mount entry */
1600
1601                         switch (mount->state) {
1602
1603                         case MOUNT_DEAD:
1604                         case MOUNT_FAILED:
1605                                 mount_enter_mounted(mount, true);
1606                                 break;
1607
1608                         case MOUNT_MOUNTING:
1609                                 mount_enter_mounting_done(mount);
1610                                 break;
1611
1612                         default:
1613                                 /* Nothing really changed, but let's
1614                                  * issue an notification call
1615                                  * nonetheless, in case somebody is
1616                                  * waiting for this. (e.g. file system
1617                                  * ro/rw remounts.) */
1618                                 mount_set_state(mount, mount->state);
1619                                 break;
1620                         }
1621                 }
1622
1623                 /* Reset the flags for later calls */
1624                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1625         }
1626 }
1627
1628 static void mount_reset_failed(Unit *u) {
1629         Mount *m = MOUNT(u);
1630
1631         assert(m);
1632
1633         if (m->state == MOUNT_FAILED)
1634                 mount_set_state(m, MOUNT_DEAD);
1635
1636         m->failure = false;
1637 }
1638
1639 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1640         [MOUNT_DEAD] = "dead",
1641         [MOUNT_MOUNTING] = "mounting",
1642         [MOUNT_MOUNTING_DONE] = "mounting-done",
1643         [MOUNT_MOUNTED] = "mounted",
1644         [MOUNT_REMOUNTING] = "remounting",
1645         [MOUNT_UNMOUNTING] = "unmounting",
1646         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1647         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1648         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1649         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1650         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1651         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1652         [MOUNT_FAILED] = "failed"
1653 };
1654
1655 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1656
1657 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1658         [MOUNT_EXEC_MOUNT] = "ExecMount",
1659         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1660         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1661 };
1662
1663 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1664
1665 const UnitVTable mount_vtable = {
1666         .suffix = ".mount",
1667
1668         .no_alias = true,
1669         .no_instances = true,
1670         .no_isolate = true,
1671         .show_status = true,
1672
1673         .init = mount_init,
1674         .load = mount_load,
1675         .done = mount_done,
1676
1677         .coldplug = mount_coldplug,
1678
1679         .dump = mount_dump,
1680
1681         .start = mount_start,
1682         .stop = mount_stop,
1683         .reload = mount_reload,
1684
1685         .serialize = mount_serialize,
1686         .deserialize_item = mount_deserialize_item,
1687
1688         .active_state = mount_active_state,
1689         .sub_state_to_string = mount_sub_state_to_string,
1690
1691         .check_gc = mount_check_gc,
1692
1693         .sigchld_event = mount_sigchld_event,
1694         .timer_event = mount_timer_event,
1695
1696         .reset_failed = mount_reset_failed,
1697
1698         .bus_interface = "org.freedesktop.systemd1.Mount",
1699         .bus_message_handler = bus_mount_message_handler,
1700         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1701
1702         .enumerate = mount_enumerate,
1703         .shutdown = mount_shutdown
1704 };