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
  40 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  41         [MOUNT_DEAD] = UNIT_INACTIVE,
  42         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  43         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  44         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  45         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  46         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  47         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  48         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  49         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  50         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  51         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  52         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  53         [MOUNT_FAILED] = UNIT_FAILED
  54 };
  55
  56 static void mount_init(Unit *u) {
  57         Mount *m = MOUNT(u);
  58
  59         assert(u);
  60         assert(u->meta.load_state == UNIT_STUB);
  61
  62         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  63         m->directory_mode = 0755;
  64
  65         exec_context_init(&m->exec_context);
  66
  67         /* We need to make sure that /bin/mount is always called in
  68          * the same process group as us, so that the autofs kernel
  69          * side doesn't send us another mount request while we are
  70          * already trying to comply its last one. */
  71         m->exec_context.same_pgrp = true;
  72
  73         /* Make sure we unmount when the devices we require go away */
  74         m->meta.stop_retroactively = 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
 104         assert(m);
 105
 106         free(m->where);
 107         m->where = NULL;
 108
 109         mount_parameters_done(&m->parameters_etc_fstab);
 110         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 111         mount_parameters_done(&m->parameters_fragment);
 112
 113         exec_context_done(&m->exec_context);
 114         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 115         m->control_command = NULL;
 116
 117         mount_unwatch_control_pid(m);
 118
 119         unit_unwatch_timer(u, &m->timer_watch);
 120 }
 121
 122 static int mount_add_mount_links(Mount *m) {
 123         Meta *other;
 124         int r;
 125         MountParameters *pm;
 126
 127         assert(m);
 128
 129         if (m->from_fragment)
 130                 pm = &m->parameters_fragment;
 131         else if (m->from_etc_fstab)
 132                 pm = &m->parameters_etc_fstab;
 133         else
 134                 pm = NULL;
 135
 136         /* Adds in links to other mount points that might lie below or
 137          * above us in the hierarchy */
 138
 139         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) {
 140                 Mount *n = (Mount*) other;
 141                 MountParameters *pn;
 142
 143                 if (n == m)
 144                         continue;
 145
 146                 if (n->meta.load_state != UNIT_LOADED)
 147                         continue;
 148
 149                 if (n->from_fragment)
 150                         pn = &n->parameters_fragment;
 151                 else if (n->from_etc_fstab)
 152                         pn = &n->parameters_etc_fstab;
 153                 else
 154                         pn = NULL;
 155
 156                 if (path_startswith(m->where, n->where)) {
 157
 158                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 159                                 return r;
 160
 161                         if (n->from_etc_fstab || n->from_fragment)
 162                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 163                                         return r;
 164
 165                 } else if (path_startswith(n->where, m->where)) {
 166
 167                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 168                                 return r;
 169
 170                         if (m->from_etc_fstab || m->from_fragment)
 171                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 172                                         return r;
 173
 174                 } else if (pm && path_startswith(pm->what, n->where)) {
 175
 176                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 177                                 return r;
 178
 179                         if (m->from_etc_fstab || m->from_fragment)
 180                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 181                                         return r;
 182
 183                 } else if (pn && path_startswith(pn->what, m->where)) {
 184
 185                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 186                                 return r;
 187
 188                         if (n->from_etc_fstab || n->from_fragment)
 189                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 190                                         return r;
 191                 }
 192         }
 193
 194         return 0;
 195 }
 196
 197 static int mount_add_swap_links(Mount *m) {
 198         Meta *other;
 199         int r;
 200
 201         assert(m);
 202
 203         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP])
 204                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 205                         return r;
 206
 207         return 0;
 208 }
 209
 210 static int mount_add_path_links(Mount *m) {
 211         Meta *other;
 212         int r;
 213
 214         assert(m);
 215
 216         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH])
 217                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 218                         return r;
 219
 220         return 0;
 221 }
 222
 223 static int mount_add_automount_links(Mount *m) {
 224         Meta *other;
 225         int r;
 226
 227         assert(m);
 228
 229         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT])
 230                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 231                         return r;
 232
 233         return 0;
 234 }
 235
 236 static int mount_add_socket_links(Mount *m) {
 237         Meta *other;
 238         int r;
 239
 240         assert(m);
 241
 242         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET])
 243                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 244                         return r;
 245
 246         return 0;
 247 }
 248
 249 static char* mount_test_option(const char *haystack, const char *needle) {
 250         struct mntent me;
 251
 252         assert(needle);
 253
 254         /* Like glibc's hasmntopt(), but works on a string, not a
 255          * struct mntent */
 256
 257         if (!haystack)
 258                 return false;
 259
 260         zero(me);
 261         me.mnt_opts = (char*) haystack;
 262
 263         return hasmntopt(&me, needle);
 264 }
 265
 266 static int mount_add_target_links(Mount *m) {
 267         const char *target, *after = NULL;
 268         MountParameters *p;
 269         Unit *tu;
 270         int r;
 271         bool noauto, handle, automount;
 272
 273         assert(m);
 274
 275         if (m->from_fragment)
 276                 p = &m->parameters_fragment;
 277         else if (m->from_etc_fstab)
 278                 p = &m->parameters_etc_fstab;
 279         else
 280                 return 0;
 281
 282         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 283         handle = !!mount_test_option(p->options, "comment=systemd.mount") ||
 284                 m->meta.manager->mount_auto;
 285         automount = !!mount_test_option(p->options, "comment=systemd.automount");
 286
 287         if (mount_test_option(p->options, "_netdev") ||
 288             (p->fstype && fstype_is_network(p->fstype))) {
 289                 target = SPECIAL_REMOTE_FS_TARGET;
 290
 291                 if (m->meta.manager->running_as == MANAGER_SYSTEM)
 292                         after = SPECIAL_NETWORK_TARGET;
 293         } else
 294                 target = SPECIAL_LOCAL_FS_TARGET;
 295
 296         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 297                 return r;
 298
 299         if (after)
 300                 if ((r = unit_add_dependency_by_name(tu, UNIT_AFTER, after, NULL, true)) < 0)
 301                         return r;
 302
 303         if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) {
 304                 Unit *am;
 305
 306                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 307                         return r;
 308
 309                 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 310         } else {
 311
 312                 /* Automatically add mount points that aren't natively
 313                  * configured to local-fs.target */
 314                 if (!noauto &&
 315                     handle &&
 316                     m->from_etc_fstab &&
 317                     m->meta.manager->running_as == MANAGER_SYSTEM)
 318                         if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 319                                 return r;
 320
 321                 return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true);
 322         }
 323 }
 324
 325 static bool mount_is_bind(MountParameters *p) {
 326         assert(p);
 327
 328         if (p->fstype && streq(p->fstype, "bind"))
 329                 return true;
 330
 331         if (mount_test_option(p->options, "bind"))
 332                 return true;
 333
 334         return false;
 335 }
 336
 337 static int mount_add_device_links(Mount *m) {
 338         MountParameters *p;
 339         int r;
 340
 341         assert(m);
 342
 343         if (m->from_fragment)
 344                 p = &m->parameters_fragment;
 345         else if (m->from_etc_fstab)
 346                 p = &m->parameters_etc_fstab;
 347         else
 348                 return 0;
 349
 350         if (!p->what)
 351                 return 0;
 352
 353         if (!mount_is_bind(p) && !path_equal(m->where, "/")) {
 354                 bool nofail, noauto;
 355
 356                 noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 357                 nofail = !!mount_test_option(p->options, "nofail");
 358
 359                 if ((r = unit_add_node_link(UNIT(m), p->what,
 360                                             !noauto && nofail &&
 361                                             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
 362                         return r;
 363         }
 364
 365         if (p->passno > 0 &&
 366             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
 367             !path_equal(m->where, "/")) {
 368                 char *name;
 369                 Unit *fsck;
 370                 /* Let's add in the fsck service */
 371
 372                 /* aka SPECIAL_FSCK_SERVICE */
 373                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 374                         return -ENOMEM;
 375
 376                 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
 377                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 378                         free(name);
 379                         return r;
 380                 }
 381
 382                 free(name);
 383
 384                 SERVICE(fsck)->fsck_passno = p->passno;
 385
 386                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 387                         return r;
 388         }
 389
 390         return 0;
 391 }
 392
 393 static int mount_add_default_dependencies(Mount *m) {
 394         int r;
 395
 396         assert(m);
 397
 398         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 399             !path_equal(m->where, "/")) {
 400
 401                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0)
 402                         return r;
 403
 404                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 405                         return r;
 406         }
 407
 408         return 0;
 409 }
 410
 411 static int mount_verify(Mount *m) {
 412         bool b;
 413         char *e;
 414         assert(m);
 415
 416         if (m->meta.load_state != UNIT_LOADED)
 417                 return 0;
 418
 419         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 420                 return -ENOENT;
 421
 422         if (!(e = unit_name_from_path(m->where, ".mount")))
 423                 return -ENOMEM;
 424
 425         b = unit_has_name(UNIT(m), e);
 426         free(e);
 427
 428         if (!b) {
 429                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 430                 return -EINVAL;
 431         }
 432
 433         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 434                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 435                 return -EBADMSG;
 436         }
 437
 438         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 439                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 440                 return -EINVAL;
 441         }
 442
 443         return 0;
 444 }
 445
 446 static int mount_load(Unit *u) {
 447         Mount *m = MOUNT(u);
 448         int r;
 449
 450         assert(u);
 451         assert(u->meta.load_state == UNIT_STUB);
 452
 453         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 454                 return r;
 455
 456         /* This is a new unit? Then let's add in some extras */
 457         if (u->meta.load_state == UNIT_LOADED) {
 458                 if (m->meta.fragment_path)
 459                         m->from_fragment = true;
 460
 461                 if (!m->where)
 462                         if (!(m->where = unit_name_to_path(u->meta.id)))
 463                                 return -ENOMEM;
 464
 465                 path_kill_slashes(m->where);
 466
 467                 if (!m->meta.description)
 468                         if ((r = unit_set_description(u, m->where)) < 0)
 469                                 return r;
 470
 471                 if ((r = mount_add_device_links(m)) < 0)
 472                         return r;
 473
 474                 if ((r = mount_add_mount_links(m)) < 0)
 475                         return r;
 476
 477                 if ((r = mount_add_socket_links(m)) < 0)
 478                         return r;
 479
 480                 if ((r = mount_add_swap_links(m)) < 0)
 481                         return r;
 482
 483                 if ((r = mount_add_path_links(m)) < 0)
 484                         return r;
 485
 486                 if ((r = mount_add_automount_links(m)) < 0)
 487                         return r;
 488
 489                 if ((r = mount_add_target_links(m)) < 0)
 490                         return r;
 491
 492                 if ((r = unit_add_default_cgroup(u)) < 0)
 493                         return r;
 494
 495                 if (m->meta.default_dependencies)
 496                         if ((r = mount_add_default_dependencies(m)) < 0)
 497                                 return r;
 498         }
 499
 500         return mount_verify(m);
 501 }
 502
 503 static int mount_notify_automount(Mount *m, int status) {
 504         Unit *p;
 505         int r;
 506
 507         assert(m);
 508
 509         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 510                 return r == -ENOENT ? 0 : r;
 511
 512         return automount_send_ready(AUTOMOUNT(p), status);
 513 }
 514
 515 static void mount_set_state(Mount *m, MountState state) {
 516         MountState old_state;
 517         assert(m);
 518
 519         old_state = m->state;
 520         m->state = state;
 521
 522         if (state != MOUNT_MOUNTING &&
 523             state != MOUNT_MOUNTING_DONE &&
 524             state != MOUNT_REMOUNTING &&
 525             state != MOUNT_UNMOUNTING &&
 526             state != MOUNT_MOUNTING_SIGTERM &&
 527             state != MOUNT_MOUNTING_SIGKILL &&
 528             state != MOUNT_UNMOUNTING_SIGTERM &&
 529             state != MOUNT_UNMOUNTING_SIGKILL &&
 530             state != MOUNT_REMOUNTING_SIGTERM &&
 531             state != MOUNT_REMOUNTING_SIGKILL) {
 532                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 533                 mount_unwatch_control_pid(m);
 534                 m->control_command = NULL;
 535                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 536         }
 537
 538         if (state == MOUNT_MOUNTED ||
 539             state == MOUNT_REMOUNTING)
 540                 mount_notify_automount(m, 0);
 541         else if (state == MOUNT_DEAD ||
 542                  state == MOUNT_UNMOUNTING ||
 543                  state == MOUNT_MOUNTING_SIGTERM ||
 544                  state == MOUNT_MOUNTING_SIGKILL ||
 545                  state == MOUNT_REMOUNTING_SIGTERM ||
 546                  state == MOUNT_REMOUNTING_SIGKILL ||
 547                  state == MOUNT_UNMOUNTING_SIGTERM ||
 548                  state == MOUNT_UNMOUNTING_SIGKILL ||
 549                  state == MOUNT_FAILED)
 550                 mount_notify_automount(m, -ENODEV);
 551
 552         if (state != old_state)
 553                 log_debug("%s changed %s -> %s",
 554                           m->meta.id,
 555                           mount_state_to_string(old_state),
 556                           mount_state_to_string(state));
 557
 558         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 559 }
 560
 561 static int mount_coldplug(Unit *u) {
 562         Mount *m = MOUNT(u);
 563         MountState new_state = MOUNT_DEAD;
 564         int r;
 565
 566         assert(m);
 567         assert(m->state == MOUNT_DEAD);
 568
 569         if (m->deserialized_state != m->state)
 570                 new_state = m->deserialized_state;
 571         else if (m->from_proc_self_mountinfo)
 572                 new_state = MOUNT_MOUNTED;
 573
 574         if (new_state != m->state) {
 575
 576                 if (new_state == MOUNT_MOUNTING ||
 577                     new_state == MOUNT_MOUNTING_DONE ||
 578                     new_state == MOUNT_REMOUNTING ||
 579                     new_state == MOUNT_UNMOUNTING ||
 580                     new_state == MOUNT_MOUNTING_SIGTERM ||
 581                     new_state == MOUNT_MOUNTING_SIGKILL ||
 582                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 583                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 584                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 585                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 586
 587                         if (m->control_pid <= 0)
 588                                 return -EBADMSG;
 589
 590                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 591                                 return r;
 592
 593                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 594                                 return r;
 595                 }
 596
 597                 mount_set_state(m, new_state);
 598         }
 599
 600         return 0;
 601 }
 602
 603 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 604         Mount *m = MOUNT(u);
 605         MountParameters *p;
 606
 607         assert(m);
 608         assert(f);
 609
 610         if (m->from_proc_self_mountinfo)
 611                 p = &m->parameters_proc_self_mountinfo;
 612         else if (m->from_fragment)
 613                 p = &m->parameters_fragment;
 614         else
 615                 p = &m->parameters_etc_fstab;
 616
 617         fprintf(f,
 618                 "%sMount State: %s\n"
 619                 "%sWhere: %s\n"
 620                 "%sWhat: %s\n"
 621                 "%sFile System Type: %s\n"
 622                 "%sOptions: %s\n"
 623                 "%sFrom /etc/fstab: %s\n"
 624                 "%sFrom /proc/self/mountinfo: %s\n"
 625                 "%sFrom fragment: %s\n"
 626                 "%sDirectoryMode: %04o\n",
 627                 prefix, mount_state_to_string(m->state),
 628                 prefix, m->where,
 629                 prefix, strna(p->what),
 630                 prefix, strna(p->fstype),
 631                 prefix, strna(p->options),
 632                 prefix, yes_no(m->from_etc_fstab),
 633                 prefix, yes_no(m->from_proc_self_mountinfo),
 634                 prefix, yes_no(m->from_fragment),
 635                 prefix, m->directory_mode);
 636
 637         if (m->control_pid > 0)
 638                 fprintf(f,
 639                         "%sControl PID: %lu\n",
 640                         prefix, (unsigned long) m->control_pid);
 641
 642         exec_context_dump(&m->exec_context, f, prefix);
 643 }
 644
 645 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 646         pid_t pid;
 647         int r;
 648
 649         assert(m);
 650         assert(c);
 651         assert(_pid);
 652
 653         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 654                 goto fail;
 655
 656         if ((r = exec_spawn(c,
 657                             NULL,
 658                             &m->exec_context,
 659                             NULL, 0,
 660                             m->meta.manager->environment,
 661                             true,
 662                             true,
 663                             true,
 664                             m->meta.manager->confirm_spawn,
 665                             m->meta.cgroup_bondings,
 666                             &pid)) < 0)
 667                 goto fail;
 668
 669         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 670                 /* FIXME: we need to do something here */
 671                 goto fail;
 672
 673         *_pid = pid;
 674
 675         return 0;
 676
 677 fail:
 678         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 679
 680         return r;
 681 }
 682
 683 static void mount_enter_dead(Mount *m, bool success) {
 684         assert(m);
 685
 686         if (!success)
 687                 m->failure = true;
 688
 689         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 690 }
 691
 692 static void mount_enter_mounted(Mount *m, bool success) {
 693         assert(m);
 694
 695         if (!success)
 696                 m->failure = true;
 697
 698         mount_set_state(m, MOUNT_MOUNTED);
 699 }
 700
 701 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 702         int r;
 703         Set *pid_set = NULL;
 704         bool wait_for_exit = false;
 705
 706         assert(m);
 707
 708         if (!success)
 709                 m->failure = true;
 710
 711         if (m->exec_context.kill_mode != KILL_NONE) {
 712                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 713                            state == MOUNT_UNMOUNTING_SIGTERM ||
 714                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 715
 716                 if (m->control_pid > 0) {
 717                         if (kill(m->exec_context.kill_mode == KILL_PROCESS_GROUP ?
 718                                  -m->control_pid :
 719                                  m->control_pid, sig) < 0 && errno != ESRCH)
 720
 721                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 722                         else
 723                                 wait_for_exit = true;
 724                 }
 725
 726                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 727
 728                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 729                                 r = -ENOMEM;
 730                                 goto fail;
 731                         }
 732
 733                         /* Exclude the control pid from being killed via the cgroup */
 734                         if (m->control_pid > 0)
 735                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 736                                         goto fail;
 737
 738                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, pid_set)) < 0) {
 739                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 740                                         log_warning("Failed to kill control group: %s", strerror(-r));
 741                         } else if (r > 0)
 742                                 wait_for_exit = true;
 743
 744                         set_free(pid_set);
 745                 }
 746         }
 747
 748         if (wait_for_exit) {
 749                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 750                         goto fail;
 751
 752                 mount_set_state(m, state);
 753         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 754                 mount_enter_mounted(m, true);
 755         else
 756                 mount_enter_dead(m, true);
 757
 758         return;
 759
 760 fail:
 761         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 762
 763         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 764                 mount_enter_mounted(m, false);
 765         else
 766                 mount_enter_dead(m, false);
 767
 768         if (pid_set)
 769                 set_free(pid_set);
 770 }
 771
 772 static void mount_enter_unmounting(Mount *m, bool success) {
 773         int r;
 774
 775         assert(m);
 776
 777         if (!success)
 778                 m->failure = true;
 779
 780         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 781         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 782
 783         if ((r = exec_command_set(
 784                              m->control_command,
 785                              "/bin/umount",
 786                              m->where,
 787                              NULL)) < 0)
 788                 goto fail;
 789
 790         mount_unwatch_control_pid(m);
 791
 792         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 793                 goto fail;
 794
 795         mount_set_state(m, MOUNT_UNMOUNTING);
 796
 797         return;
 798
 799 fail:
 800         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 801         mount_enter_mounted(m, false);
 802 }
 803
 804 static void mount_enter_mounting(Mount *m) {
 805         int r;
 806
 807         assert(m);
 808
 809         m->control_command_id = MOUNT_EXEC_MOUNT;
 810         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 811
 812         mkdir_p(m->where, m->directory_mode);
 813
 814         if (m->from_fragment)
 815                 r = exec_command_set(
 816                                 m->control_command,
 817                                 "/bin/mount",
 818                                 m->parameters_fragment.what,
 819                                 m->where,
 820                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 821                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 822                                 NULL);
 823         else if (m->from_etc_fstab)
 824                 r = exec_command_set(
 825                                 m->control_command,
 826                                 "/bin/mount",
 827                                 m->where,
 828                                 NULL);
 829         else
 830                 r = -ENOENT;
 831
 832         if (r < 0)
 833                 goto fail;
 834
 835         mount_unwatch_control_pid(m);
 836
 837         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 838                 goto fail;
 839
 840         mount_set_state(m, MOUNT_MOUNTING);
 841
 842         return;
 843
 844 fail:
 845         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 846         mount_enter_dead(m, false);
 847 }
 848
 849 static void mount_enter_mounting_done(Mount *m) {
 850         assert(m);
 851
 852         mount_set_state(m, MOUNT_MOUNTING_DONE);
 853 }
 854
 855 static void mount_enter_remounting(Mount *m, bool success) {
 856         int r;
 857
 858         assert(m);
 859
 860         if (!success)
 861                 m->failure = true;
 862
 863         m->control_command_id = MOUNT_EXEC_REMOUNT;
 864         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 865
 866         if (m->from_fragment) {
 867                 char *buf = NULL;
 868                 const char *o;
 869
 870                 if (m->parameters_fragment.options) {
 871                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 872                                 r = -ENOMEM;
 873                                 goto fail;
 874                         }
 875
 876                         o = buf;
 877                 } else
 878                         o = "remount";
 879
 880                 r = exec_command_set(
 881                                 m->control_command,
 882                                 "/bin/mount",
 883                                 m->parameters_fragment.what,
 884                                 m->where,
 885                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 886                                 "-o", o,
 887                                 NULL);
 888
 889                 free(buf);
 890         } else if (m->from_etc_fstab)
 891                 r = exec_command_set(
 892                                 m->control_command,
 893                                 "/bin/mount",
 894                                 m->where,
 895                                 "-o", "remount",
 896                                 NULL);
 897         else
 898                 r = -ENOENT;
 899
 900         if (r < 0)
 901                 goto fail;
 902
 903         mount_unwatch_control_pid(m);
 904
 905         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 906                 goto fail;
 907
 908         mount_set_state(m, MOUNT_REMOUNTING);
 909
 910         return;
 911
 912 fail:
 913         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 914         mount_enter_mounted(m, false);
 915 }
 916
 917 static int mount_start(Unit *u) {
 918         Mount *m = MOUNT(u);
 919
 920         assert(m);
 921
 922         /* We cannot fulfill this request right now, try again later
 923          * please! */
 924         if (m->state == MOUNT_UNMOUNTING ||
 925             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 926             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 927             m->state == MOUNT_MOUNTING_SIGTERM ||
 928             m->state == MOUNT_MOUNTING_SIGKILL)
 929                 return -EAGAIN;
 930
 931         /* Already on it! */
 932         if (m->state == MOUNT_MOUNTING)
 933                 return 0;
 934
 935         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
 936
 937         m->failure = false;
 938         mount_enter_mounting(m);
 939         return 0;
 940 }
 941
 942 static int mount_stop(Unit *u) {
 943         Mount *m = MOUNT(u);
 944
 945         assert(m);
 946
 947         /* Already on it */
 948         if (m->state == MOUNT_UNMOUNTING ||
 949             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 950             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 951             m->state == MOUNT_MOUNTING_SIGTERM ||
 952             m->state == MOUNT_MOUNTING_SIGKILL)
 953                 return 0;
 954
 955         assert(m->state == MOUNT_MOUNTING ||
 956                m->state == MOUNT_MOUNTING_DONE ||
 957                m->state == MOUNT_MOUNTED ||
 958                m->state == MOUNT_REMOUNTING ||
 959                m->state == MOUNT_REMOUNTING_SIGTERM ||
 960                m->state == MOUNT_REMOUNTING_SIGKILL);
 961
 962         mount_enter_unmounting(m, true);
 963         return 0;
 964 }
 965
 966 static int mount_reload(Unit *u) {
 967         Mount *m = MOUNT(u);
 968
 969         assert(m);
 970
 971         if (m->state == MOUNT_MOUNTING_DONE)
 972                 return -EAGAIN;
 973
 974         assert(m->state == MOUNT_MOUNTED);
 975
 976         mount_enter_remounting(m, true);
 977         return 0;
 978 }
 979
 980 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
 981         Mount *m = MOUNT(u);
 982
 983         assert(m);
 984         assert(f);
 985         assert(fds);
 986
 987         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
 988         unit_serialize_item(u, f, "failure", yes_no(m->failure));
 989
 990         if (m->control_pid > 0)
 991                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
 992
 993         if (m->control_command_id >= 0)
 994                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
 995
 996         return 0;
 997 }
 998
 999 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1000         Mount *m = MOUNT(u);
1001
1002         assert(u);
1003         assert(key);
1004         assert(value);
1005         assert(fds);
1006
1007         if (streq(key, "state")) {
1008                 MountState state;
1009
1010                 if ((state = mount_state_from_string(value)) < 0)
1011                         log_debug("Failed to parse state value %s", value);
1012                 else
1013                         m->deserialized_state = state;
1014         } else if (streq(key, "failure")) {
1015                 int b;
1016
1017                 if ((b = parse_boolean(value)) < 0)
1018                         log_debug("Failed to parse failure value %s", value);
1019                 else
1020                         m->failure = b || m->failure;
1021
1022         } else if (streq(key, "control-pid")) {
1023                 pid_t pid;
1024
1025                 if (parse_pid(value, &pid) < 0)
1026                         log_debug("Failed to parse control-pid value %s", value);
1027                 else
1028                         m->control_pid = pid;
1029         } else if (streq(key, "control-command")) {
1030                 MountExecCommand id;
1031
1032                 if ((id = mount_exec_command_from_string(value)) < 0)
1033                         log_debug("Failed to parse exec-command value %s", value);
1034                 else {
1035                         m->control_command_id = id;
1036                         m->control_command = m->exec_command + id;
1037                 }
1038
1039         } else
1040                 log_debug("Unknown serialization key '%s'", key);
1041
1042         return 0;
1043 }
1044
1045 static UnitActiveState mount_active_state(Unit *u) {
1046         assert(u);
1047
1048         return state_translation_table[MOUNT(u)->state];
1049 }
1050
1051 static const char *mount_sub_state_to_string(Unit *u) {
1052         assert(u);
1053
1054         return mount_state_to_string(MOUNT(u)->state);
1055 }
1056
1057 static bool mount_check_gc(Unit *u) {
1058         Mount *m = MOUNT(u);
1059
1060         assert(m);
1061
1062         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1063 }
1064
1065 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1066         Mount *m = MOUNT(u);
1067         bool success;
1068
1069         assert(m);
1070         assert(pid >= 0);
1071
1072         if (pid != m->control_pid)
1073                 return;
1074
1075         m->control_pid = 0;
1076
1077         success = is_clean_exit(code, status);
1078         m->failure = m->failure || !success;
1079
1080         if (m->control_command) {
1081                 exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id);
1082                 m->control_command = NULL;
1083                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1084         }
1085
1086         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1087                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1088
1089         /* Note that mount(8) returning and the kernel sending us a
1090          * mount table change event might happen out-of-order. If an
1091          * operation succeed we assume the kernel will follow soon too
1092          * and already change into the resulting state.  If it fails
1093          * we check if the kernel still knows about the mount. and
1094          * change state accordingly. */
1095
1096         switch (m->state) {
1097
1098         case MOUNT_MOUNTING:
1099         case MOUNT_MOUNTING_DONE:
1100         case MOUNT_MOUNTING_SIGKILL:
1101         case MOUNT_MOUNTING_SIGTERM:
1102         case MOUNT_REMOUNTING:
1103         case MOUNT_REMOUNTING_SIGKILL:
1104         case MOUNT_REMOUNTING_SIGTERM:
1105
1106                 if (success)
1107                         mount_enter_mounted(m, true);
1108                 else if (m->from_proc_self_mountinfo)
1109                         mount_enter_mounted(m, false);
1110                 else
1111                         mount_enter_dead(m, false);
1112                 break;
1113
1114         case MOUNT_UNMOUNTING:
1115         case MOUNT_UNMOUNTING_SIGKILL:
1116         case MOUNT_UNMOUNTING_SIGTERM:
1117
1118                 if (success)
1119                         mount_enter_dead(m, true);
1120                 else if (m->from_proc_self_mountinfo)
1121                         mount_enter_mounted(m, false);
1122                 else
1123                         mount_enter_dead(m, false);
1124                 break;
1125
1126         default:
1127                 assert_not_reached("Uh, control process died at wrong time.");
1128         }
1129
1130         /* Notify clients about changed exit status */
1131         unit_add_to_dbus_queue(u);
1132 }
1133
1134 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1135         Mount *m = MOUNT(u);
1136
1137         assert(m);
1138         assert(elapsed == 1);
1139         assert(w == &m->timer_watch);
1140
1141         switch (m->state) {
1142
1143         case MOUNT_MOUNTING:
1144         case MOUNT_MOUNTING_DONE:
1145                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1146                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1147                 break;
1148
1149         case MOUNT_REMOUNTING:
1150                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1151                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
1152                 break;
1153
1154         case MOUNT_UNMOUNTING:
1155                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1156                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1157                 break;
1158
1159         case MOUNT_MOUNTING_SIGTERM:
1160                 log_warning("%s mounting timed out. Killing.", u->meta.id);
1161                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1162                 break;
1163
1164         case MOUNT_REMOUNTING_SIGTERM:
1165                 log_warning("%s remounting timed out. Killing.", u->meta.id);
1166                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1167                 break;
1168
1169         case MOUNT_UNMOUNTING_SIGTERM:
1170                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
1171                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1172                 break;
1173
1174         case MOUNT_MOUNTING_SIGKILL:
1175         case MOUNT_REMOUNTING_SIGKILL:
1176         case MOUNT_UNMOUNTING_SIGKILL:
1177                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1178
1179                 if (m->from_proc_self_mountinfo)
1180                         mount_enter_mounted(m, false);
1181                 else
1182                         mount_enter_dead(m, false);
1183                 break;
1184
1185         default:
1186                 assert_not_reached("Timeout at wrong time.");
1187         }
1188 }
1189
1190 static int mount_add_one(
1191                 Manager *m,
1192                 const char *what,
1193                 const char *where,
1194                 const char *options,
1195                 const char *fstype,
1196                 int passno,
1197                 bool from_proc_self_mountinfo,
1198                 bool set_flags) {
1199         int r;
1200         Unit *u;
1201         bool delete;
1202         char *e, *w = NULL, *o = NULL, *f = NULL;
1203         MountParameters *p;
1204
1205         assert(m);
1206         assert(what);
1207         assert(where);
1208         assert(options);
1209         assert(fstype);
1210
1211         assert(!set_flags || from_proc_self_mountinfo);
1212
1213         /* Ignore API mount points. They should never be referenced in
1214          * dependencies ever. */
1215         if (mount_point_is_api(where))
1216                 return 0;
1217
1218         if (streq(fstype, "autofs"))
1219                 return 0;
1220
1221         /* probably some kind of swap, ignore */
1222         if (!is_path(where))
1223                 return 0;
1224
1225         if (!(e = unit_name_from_path(where, ".mount")))
1226                 return -ENOMEM;
1227
1228         if (!(u = manager_get_unit(m, e))) {
1229                 delete = true;
1230
1231                 if (!(u = unit_new(m))) {
1232                         free(e);
1233                         return -ENOMEM;
1234                 }
1235
1236                 r = unit_add_name(u, e);
1237                 free(e);
1238
1239                 if (r < 0)
1240                         goto fail;
1241
1242                 if (!(MOUNT(u)->where = strdup(where))) {
1243                         r = -ENOMEM;
1244                         goto fail;
1245                 }
1246
1247                 unit_add_to_load_queue(u);
1248         } else {
1249                 delete = false;
1250                 free(e);
1251         }
1252
1253         if (!(w = strdup(what)) ||
1254             !(o = strdup(options)) ||
1255             !(f = strdup(fstype))) {
1256                 r = -ENOMEM;
1257                 goto fail;
1258         }
1259
1260         if (from_proc_self_mountinfo) {
1261                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1262
1263                 if (set_flags) {
1264                         MOUNT(u)->is_mounted = true;
1265                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1266                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1267                 }
1268
1269                 MOUNT(u)->from_proc_self_mountinfo = true;
1270         } else {
1271                 p = &MOUNT(u)->parameters_etc_fstab;
1272                 MOUNT(u)->from_etc_fstab = true;
1273         }
1274
1275         free(p->what);
1276         p->what = w;
1277
1278         free(p->options);
1279         p->options = o;
1280
1281         free(p->fstype);
1282         p->fstype = f;
1283
1284         p->passno = passno;
1285
1286         unit_add_to_dbus_queue(u);
1287
1288         return 0;
1289
1290 fail:
1291         free(w);
1292         free(o);
1293         free(f);
1294
1295         if (delete && u)
1296                 unit_free(u);
1297
1298         return r;
1299 }
1300
1301 static char *fstab_node_to_udev_node(char *p) {
1302         char *dn, *t, *u;
1303         int r;
1304
1305         /* FIXME: to follow udev's logic 100% we need to leave valid
1306          * UTF8 chars unescaped */
1307
1308         if (startswith(p, "LABEL=")) {
1309
1310                 if (!(u = unquote(p+6, "\"\'")))
1311                         return NULL;
1312
1313                 t = xescape(u, "/ ");
1314                 free(u);
1315
1316                 if (!t)
1317                         return NULL;
1318
1319                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
1320                 free(t);
1321
1322                 if (r < 0)
1323                         return NULL;
1324
1325                 return dn;
1326         }
1327
1328         if (startswith(p, "UUID=")) {
1329
1330                 if (!(u = unquote(p+5, "\"\'")))
1331                         return NULL;
1332
1333                 t = xescape(u, "/ ");
1334                 free(u);
1335
1336                 if (!t)
1337                         return NULL;
1338
1339                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
1340                 free(t);
1341
1342                 if (r < 0)
1343                         return NULL;
1344
1345                 return dn;
1346         }
1347
1348         return strdup(p);
1349 }
1350
1351 static int mount_find_pri(char *options) {
1352         char *end, *pri;
1353         unsigned long r;
1354
1355         if (!(pri = mount_test_option(options, "pri=")))
1356                 return 0;
1357
1358         pri += 4;
1359
1360         errno = 0;
1361         r = strtoul(pri, &end, 10);
1362
1363         if (errno != 0)
1364                 return -errno;
1365
1366         if (end == pri || (*end != ',' && *end != 0))
1367                 return -EINVAL;
1368
1369         return (int) r;
1370 }
1371
1372 static int mount_load_etc_fstab(Manager *m) {
1373         FILE *f;
1374         int r = 0;
1375         struct mntent* me;
1376
1377         assert(m);
1378
1379         errno = 0;
1380         if (!(f = setmntent("/etc/fstab", "r")))
1381                 return -errno;
1382
1383         while ((me = getmntent(f))) {
1384                 char *where, *what;
1385                 int k;
1386
1387                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1388                         r = -ENOMEM;
1389                         goto finish;
1390                 }
1391
1392                 if (!(where = strdup(me->mnt_dir))) {
1393                         free(what);
1394                         r = -ENOMEM;
1395                         goto finish;
1396                 }
1397
1398                 if (what[0] == '/')
1399                         path_kill_slashes(what);
1400
1401                 if (where[0] == '/')
1402                         path_kill_slashes(where);
1403
1404                 if (streq(me->mnt_type, "swap")) {
1405                         int pri;
1406
1407                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1408                                 k = pri;
1409                         else
1410                                 k = swap_add_one(m,
1411                                                  what,
1412                                                  NULL,
1413                                                  pri,
1414                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1415                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1416                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1417                                                  false);
1418                 } else
1419                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1420
1421                 free(what);
1422                 free(where);
1423
1424                 if (r < 0)
1425                         r = k;
1426         }
1427
1428 finish:
1429
1430         endmntent(f);
1431         return r;
1432 }
1433
1434 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1435         int r = 0;
1436         unsigned i;
1437         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1438
1439         assert(m);
1440
1441         rewind(m->proc_self_mountinfo);
1442
1443         for (i = 1;; i++) {
1444                 int k;
1445
1446                 device = path = options = options2 = fstype = d = p = o = NULL;
1447
1448                 if ((k = fscanf(m->proc_self_mountinfo,
1449                                 "%*s "       /* (1) mount id */
1450                                 "%*s "       /* (2) parent id */
1451                                 "%*s "       /* (3) major:minor */
1452                                 "%*s "       /* (4) root */
1453                                 "%ms "       /* (5) mount point */
1454                                 "%ms"        /* (6) mount options */
1455                                 "%*[^-]"     /* (7) optional fields */
1456                                 "- "         /* (8) separator */
1457                                 "%ms "       /* (9) file system type */
1458                                 "%ms"        /* (10) mount source */
1459                                 "%ms"        /* (11) mount options 2 */
1460                                 "%*[^\n]",   /* some rubbish at the end */
1461                                 &path,
1462                                 &options,
1463                                 &fstype,
1464                                 &device,
1465                                 &options2)) != 5) {
1466
1467                         if (k == EOF)
1468                                 break;
1469
1470                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1471                         goto clean_up;
1472                 }
1473
1474                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1475                         r = -ENOMEM;
1476                         goto finish;
1477                 }
1478
1479                 if (!(d = cunescape(device)) ||
1480                     !(p = cunescape(path))) {
1481                         r = -ENOMEM;
1482                         goto finish;
1483                 }
1484
1485                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1486                         r = k;
1487
1488 clean_up:
1489                 free(device);
1490                 free(path);
1491                 free(options);
1492                 free(options2);
1493                 free(fstype);
1494                 free(d);
1495                 free(p);
1496                 free(o);
1497         }
1498
1499 finish:
1500         free(device);
1501         free(path);
1502         free(options);
1503         free(options2);
1504         free(fstype);
1505         free(d);
1506         free(p);
1507         free(o);
1508
1509         return r;
1510 }
1511
1512 static void mount_shutdown(Manager *m) {
1513         assert(m);
1514
1515         if (m->proc_self_mountinfo) {
1516                 fclose(m->proc_self_mountinfo);
1517                 m->proc_self_mountinfo = NULL;
1518         }
1519 }
1520
1521 static int mount_enumerate(Manager *m) {
1522         int r;
1523         struct epoll_event ev;
1524         assert(m);
1525
1526         if (!m->proc_self_mountinfo) {
1527                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1528                         return -errno;
1529
1530                 m->mount_watch.type = WATCH_MOUNT;
1531                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1532
1533                 zero(ev);
1534                 ev.events = EPOLLPRI;
1535                 ev.data.ptr = &m->mount_watch;
1536
1537                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1538                         return -errno;
1539         }
1540
1541         if ((r = mount_load_etc_fstab(m)) < 0)
1542                 goto fail;
1543
1544         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1545                 goto fail;
1546
1547         return 0;
1548
1549 fail:
1550         mount_shutdown(m);
1551         return r;
1552 }
1553
1554 void mount_fd_event(Manager *m, int events) {
1555         Meta *meta;
1556         int r;
1557
1558         assert(m);
1559         assert(events & EPOLLPRI);
1560
1561         /* The manager calls this for every fd event happening on the
1562          * /proc/self/mountinfo file, which informs us about mounting
1563          * table changes */
1564
1565         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1566                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1567
1568                 /* Reset flags, just in case, for later calls */
1569                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1570                         Mount *mount = (Mount*) meta;
1571
1572                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1573                 }
1574
1575                 return;
1576         }
1577
1578         manager_dispatch_load_queue(m);
1579
1580         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1581                 Mount *mount = (Mount*) meta;
1582
1583                 if (!mount->is_mounted) {
1584                         /* This has just been unmounted. */
1585
1586                         mount->from_proc_self_mountinfo = false;
1587
1588                         switch (mount->state) {
1589
1590                         case MOUNT_MOUNTED:
1591                                 mount_enter_dead(mount, true);
1592                                 break;
1593
1594                         default:
1595                                 mount_set_state(mount, mount->state);
1596                                 break;
1597
1598                         }
1599
1600                 } else if (mount->just_mounted || mount->just_changed) {
1601
1602                         /* New or changed mount entry */
1603
1604                         switch (mount->state) {
1605
1606                         case MOUNT_DEAD:
1607                         case MOUNT_FAILED:
1608                                 mount_enter_mounted(mount, true);
1609                                 break;
1610
1611                         case MOUNT_MOUNTING:
1612                                 mount_enter_mounting_done(mount);
1613                                 break;
1614
1615                         default:
1616                                 /* Nothing really changed, but let's
1617                                  * issue an notification call
1618                                  * nonetheless, in case somebody is
1619                                  * waiting for this. (e.g. file system
1620                                  * ro/rw remounts.) */
1621                                 mount_set_state(mount, mount->state);
1622                                 break;
1623                         }
1624                 }
1625
1626                 /* Reset the flags for later calls */
1627                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1628         }
1629 }
1630
1631 static void mount_reset_failed(Unit *u) {
1632         Mount *m = MOUNT(u);
1633
1634         assert(m);
1635
1636         if (m->state == MOUNT_FAILED)
1637                 mount_set_state(m, MOUNT_DEAD);
1638
1639         m->failure = false;
1640 }
1641
1642 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1643         Mount *m = MOUNT(u);
1644         int r = 0;
1645         Set *pid_set = NULL;
1646
1647         assert(m);
1648
1649         if (who == KILL_MAIN) {
1650                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1651                 return -EINVAL;
1652         }
1653
1654         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1655                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1656                 return -ENOENT;
1657         }
1658
1659         if (m->control_pid > 0)
1660                 if (kill(mode == KILL_PROCESS_GROUP ? -m->control_pid : m->control_pid, signo) < 0)
1661                         r = -errno;
1662
1663         if (mode == KILL_CONTROL_GROUP) {
1664                 int q;
1665
1666                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1667                         return -ENOMEM;
1668
1669                 /* Exclude the control pid from being killed via the cgroup */
1670                 if (m->control_pid > 0)
1671                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1672                                 r = q;
1673                                 goto finish;
1674                         }
1675
1676                 if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, pid_set)) < 0)
1677                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1678                                 r = q;
1679         }
1680
1681 finish:
1682         if (pid_set)
1683                 set_free(pid_set);
1684
1685         return r;
1686 }
1687
1688 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1689         [MOUNT_DEAD] = "dead",
1690         [MOUNT_MOUNTING] = "mounting",
1691         [MOUNT_MOUNTING_DONE] = "mounting-done",
1692         [MOUNT_MOUNTED] = "mounted",
1693         [MOUNT_REMOUNTING] = "remounting",
1694         [MOUNT_UNMOUNTING] = "unmounting",
1695         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1696         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1697         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1698         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1699         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1700         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1701         [MOUNT_FAILED] = "failed"
1702 };
1703
1704 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1705
1706 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1707         [MOUNT_EXEC_MOUNT] = "ExecMount",
1708         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1709         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1710 };
1711
1712 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1713
1714 const UnitVTable mount_vtable = {
1715         .suffix = ".mount",
1716
1717         .no_alias = true,
1718         .no_instances = true,
1719         .no_isolate = true,
1720         .show_status = true,
1721
1722         .init = mount_init,
1723         .load = mount_load,
1724         .done = mount_done,
1725
1726         .coldplug = mount_coldplug,
1727
1728         .dump = mount_dump,
1729
1730         .start = mount_start,
1731         .stop = mount_stop,
1732         .reload = mount_reload,
1733
1734         .kill = mount_kill,
1735
1736         .serialize = mount_serialize,
1737         .deserialize_item = mount_deserialize_item,
1738
1739         .active_state = mount_active_state,
1740         .sub_state_to_string = mount_sub_state_to_string,
1741
1742         .check_gc = mount_check_gc,
1743
1744         .sigchld_event = mount_sigchld_event,
1745         .timer_event = mount_timer_event,
1746
1747         .reset_failed = mount_reset_failed,
1748
1749         .bus_interface = "org.freedesktop.systemd1.Mount",
1750         .bus_message_handler = bus_mount_message_handler,
1751         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1752
1753         .enumerate = mount_enumerate,
1754         .shutdown = mount_shutdown
1755 };