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         m->timer_watch.type = WATCH_INVALID;
  74
  75         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  76 }
  77
  78 static void mount_unwatch_control_pid(Mount *m) {
  79         assert(m);
  80
  81         if (m->control_pid <= 0)
  82                 return;
  83
  84         unit_unwatch_pid(UNIT(m), m->control_pid);
  85         m->control_pid = 0;
  86 }
  87
  88 static void mount_parameters_done(MountParameters *p) {
  89         assert(p);
  90
  91         free(p->what);
  92         free(p->options);
  93         free(p->fstype);
  94
  95         p->what = p->options = p->fstype = NULL;
  96 }
  97
  98 static void mount_done(Unit *u) {
  99         Mount *m = MOUNT(u);
 100
 101         assert(m);
 102
 103         free(m->where);
 104         m->where = NULL;
 105
 106         mount_parameters_done(&m->parameters_etc_fstab);
 107         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 108         mount_parameters_done(&m->parameters_fragment);
 109
 110         exec_context_done(&m->exec_context);
 111         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 112         m->control_command = NULL;
 113
 114         mount_unwatch_control_pid(m);
 115
 116         unit_unwatch_timer(u, &m->timer_watch);
 117 }
 118
 119 static int mount_add_mount_links(Mount *m) {
 120         Meta *other;
 121         int r;
 122         MountParameters *pm;
 123
 124         assert(m);
 125
 126         if (m->from_fragment)
 127                 pm = &m->parameters_fragment;
 128         else if (m->from_etc_fstab)
 129                 pm = &m->parameters_etc_fstab;
 130         else
 131                 pm = NULL;
 132
 133         /* Adds in links to other mount points that might lie below or
 134          * above us in the hierarchy */
 135
 136         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) {
 137                 Mount *n = (Mount*) other;
 138                 MountParameters *pn;
 139
 140                 if (n == m)
 141                         continue;
 142
 143                 if (n->meta.load_state != UNIT_LOADED)
 144                         continue;
 145
 146                 if (n->from_fragment)
 147                         pn = &n->parameters_fragment;
 148                 else if (n->from_etc_fstab)
 149                         pn = &n->parameters_etc_fstab;
 150                 else
 151                         pn = NULL;
 152
 153                 if (path_startswith(m->where, n->where)) {
 154
 155                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 156                                 return r;
 157
 158                         if (n->from_etc_fstab || n->from_fragment)
 159                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 160                                         return r;
 161
 162                 } else if (path_startswith(n->where, m->where)) {
 163
 164                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 165                                 return r;
 166
 167                         if (m->from_etc_fstab || m->from_fragment)
 168                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 169                                         return r;
 170
 171                 } else if (pm && path_startswith(pm->what, n->where)) {
 172
 173                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 174                                 return r;
 175
 176                         if (m->from_etc_fstab || m->from_fragment)
 177                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 178                                         return r;
 179
 180                 } else if (pn && path_startswith(pn->what, m->where)) {
 181
 182                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 183                                 return r;
 184
 185                         if (n->from_etc_fstab || n->from_fragment)
 186                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 187                                         return r;
 188                 }
 189         }
 190
 191         return 0;
 192 }
 193
 194 static int mount_add_swap_links(Mount *m) {
 195         Meta *other;
 196         int r;
 197
 198         assert(m);
 199
 200         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP])
 201                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 202                         return r;
 203
 204         return 0;
 205 }
 206
 207 static int mount_add_path_links(Mount *m) {
 208         Meta *other;
 209         int r;
 210
 211         assert(m);
 212
 213         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH])
 214                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 215                         return r;
 216
 217         return 0;
 218 }
 219
 220 static int mount_add_automount_links(Mount *m) {
 221         Meta *other;
 222         int r;
 223
 224         assert(m);
 225
 226         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT])
 227                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 228                         return r;
 229
 230         return 0;
 231 }
 232
 233 static int mount_add_socket_links(Mount *m) {
 234         Meta *other;
 235         int r;
 236
 237         assert(m);
 238
 239         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET])
 240                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 241                         return r;
 242
 243         return 0;
 244 }
 245
 246 static char* mount_test_option(const char *haystack, const char *needle) {
 247         struct mntent me;
 248
 249         assert(needle);
 250
 251         /* Like glibc's hasmntopt(), but works on a string, not a
 252          * struct mntent */
 253
 254         if (!haystack)
 255                 return false;
 256
 257         zero(me);
 258         me.mnt_opts = (char*) haystack;
 259
 260         return hasmntopt(&me, needle);
 261 }
 262
 263 static int mount_add_target_links(Mount *m) {
 264         const char *target, *after = NULL;
 265         MountParameters *p;
 266         Unit *tu;
 267         int r;
 268         bool noauto, handle, automount, user;
 269
 270         assert(m);
 271
 272         if (m->from_fragment)
 273                 p = &m->parameters_fragment;
 274         else if (m->from_etc_fstab)
 275                 p = &m->parameters_etc_fstab;
 276         else
 277                 return 0;
 278
 279         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 280         user = mount_test_option(p->options, "user") || mount_test_option(p->options, "users");
 281         handle = !!mount_test_option(p->options, "comment=systemd.mount") ||
 282                 m->meta.manager->mount_auto;
 283         automount = !!mount_test_option(p->options, "comment=systemd.automount");
 284
 285         if (mount_test_option(p->options, "_netdev") ||
 286             (p->fstype && fstype_is_network(p->fstype))) {
 287                 target = SPECIAL_REMOTE_FS_TARGET;
 288
 289                 if (m->meta.manager->running_as == MANAGER_SYSTEM)
 290                         after = SPECIAL_NETWORK_TARGET;
 291         } else
 292                 target = SPECIAL_LOCAL_FS_TARGET;
 293
 294         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 295                 return r;
 296
 297         if (after)
 298                 if ((r = unit_add_dependency_by_name(tu, UNIT_AFTER, after, NULL, true)) < 0)
 299                         return r;
 300
 301         if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) {
 302                 Unit *am;
 303
 304                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 305                         return r;
 306
 307                 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 308         } else {
 309
 310                 /* Automatically add mount points that aren't natively
 311                  * configured to local-fs.target */
 312                 if (!noauto &&
 313                     handle &&
 314                     !m->from_fragment)
 315                         if (user || m->meta.manager->running_as == MANAGER_SYSTEM)
 316                                 if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 317                                         return r;
 318
 319                 return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true);
 320         }
 321 }
 322
 323 static bool mount_is_bind(MountParameters *p) {
 324         assert(p);
 325
 326         if (p->fstype && streq(p->fstype, "bind"))
 327                 return true;
 328
 329         if (mount_test_option(p->options, "bind"))
 330                 return true;
 331
 332         return false;
 333 }
 334
 335 static int mount_add_device_links(Mount *m) {
 336         MountParameters *p;
 337         int r;
 338
 339         assert(m);
 340
 341         if (m->from_fragment)
 342                 p = &m->parameters_fragment;
 343         else if (m->from_etc_fstab)
 344                 p = &m->parameters_etc_fstab;
 345         else
 346                 return 0;
 347
 348         if (!p->what)
 349                 return 0;
 350
 351         if (!mount_is_bind(p) && !path_equal(m->where, "/")) {
 352                 bool nofail, noauto;
 353
 354                 noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 355                 nofail = !!mount_test_option(p->options, "nofail");
 356
 357                 if ((r = unit_add_node_link(UNIT(m), p->what,
 358                                             !noauto && nofail &&
 359                                             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
 360                         return r;
 361         }
 362
 363         if (p->passno > 0 &&
 364             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
 365             !path_equal(m->where, "/")) {
 366                 char *name;
 367                 Unit *fsck;
 368                 /* Let's add in the fsck service */
 369
 370                 /* aka SPECIAL_FSCK_SERVICE */
 371                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 372                         return -ENOMEM;
 373
 374                 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
 375                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 376                         free(name);
 377                         return r;
 378                 }
 379
 380                 free(name);
 381
 382                 SERVICE(fsck)->fsck_passno = p->passno;
 383
 384                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 385                         return r;
 386         }
 387
 388         return 0;
 389 }
 390
 391 static int mount_add_default_dependencies(Mount *m) {
 392         int r;
 393
 394         assert(m);
 395
 396         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 397             !path_equal(m->where, "/")) {
 398
 399                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0)
 400                         return r;
 401
 402                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTED_BY, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 403                         return r;
 404         }
 405
 406         return 0;
 407 }
 408
 409 static int mount_verify(Mount *m) {
 410         bool b;
 411         char *e;
 412         assert(m);
 413
 414         if (m->meta.load_state != UNIT_LOADED)
 415                 return 0;
 416
 417         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 418                 return -ENOENT;
 419
 420         if (!(e = unit_name_from_path(m->where, ".mount")))
 421                 return -ENOMEM;
 422
 423         b = unit_has_name(UNIT(m), e);
 424         free(e);
 425
 426         if (!b) {
 427                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 428                 return -EINVAL;
 429         }
 430
 431         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 432                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 433                 return -EBADMSG;
 434         }
 435
 436         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 437                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 438                 return -EINVAL;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static int mount_load(Unit *u) {
 445         Mount *m = MOUNT(u);
 446         int r;
 447
 448         assert(u);
 449         assert(u->meta.load_state == UNIT_STUB);
 450
 451         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 452                 return r;
 453
 454         /* This is a new unit? Then let's add in some extras */
 455         if (u->meta.load_state == UNIT_LOADED) {
 456                 if (m->meta.fragment_path)
 457                         m->from_fragment = true;
 458
 459                 if (!m->where)
 460                         if (!(m->where = unit_name_to_path(u->meta.id)))
 461                                 return -ENOMEM;
 462
 463                 path_kill_slashes(m->where);
 464
 465                 if (!m->meta.description)
 466                         if ((r = unit_set_description(u, m->where)) < 0)
 467                                 return r;
 468
 469                 if ((r = mount_add_device_links(m)) < 0)
 470                         return r;
 471
 472                 if ((r = mount_add_mount_links(m)) < 0)
 473                         return r;
 474
 475                 if ((r = mount_add_socket_links(m)) < 0)
 476                         return r;
 477
 478                 if ((r = mount_add_swap_links(m)) < 0)
 479                         return r;
 480
 481                 if ((r = mount_add_path_links(m)) < 0)
 482                         return r;
 483
 484                 if ((r = mount_add_automount_links(m)) < 0)
 485                         return r;
 486
 487                 if ((r = mount_add_target_links(m)) < 0)
 488                         return r;
 489
 490                 if ((r = unit_add_default_cgroup(u)) < 0)
 491                         return r;
 492
 493                 if (m->meta.default_dependencies)
 494                         if ((r = mount_add_default_dependencies(m)) < 0)
 495                                 return r;
 496         }
 497
 498         return mount_verify(m);
 499 }
 500
 501 static int mount_notify_automount(Mount *m, int status) {
 502         Unit *p;
 503         int r;
 504
 505         assert(m);
 506
 507         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 508                 return r == -ENOENT ? 0 : r;
 509
 510         return automount_send_ready(AUTOMOUNT(p), status);
 511 }
 512
 513 static void mount_set_state(Mount *m, MountState state) {
 514         MountState old_state;
 515         assert(m);
 516
 517         old_state = m->state;
 518         m->state = state;
 519
 520         if (state != MOUNT_MOUNTING &&
 521             state != MOUNT_MOUNTING_DONE &&
 522             state != MOUNT_REMOUNTING &&
 523             state != MOUNT_UNMOUNTING &&
 524             state != MOUNT_MOUNTING_SIGTERM &&
 525             state != MOUNT_MOUNTING_SIGKILL &&
 526             state != MOUNT_UNMOUNTING_SIGTERM &&
 527             state != MOUNT_UNMOUNTING_SIGKILL &&
 528             state != MOUNT_REMOUNTING_SIGTERM &&
 529             state != MOUNT_REMOUNTING_SIGKILL) {
 530                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 531                 mount_unwatch_control_pid(m);
 532                 m->control_command = NULL;
 533                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 534         }
 535
 536         if (state == MOUNT_MOUNTED ||
 537             state == MOUNT_REMOUNTING)
 538                 mount_notify_automount(m, 0);
 539         else if (state == MOUNT_DEAD ||
 540                  state == MOUNT_UNMOUNTING ||
 541                  state == MOUNT_MOUNTING_SIGTERM ||
 542                  state == MOUNT_MOUNTING_SIGKILL ||
 543                  state == MOUNT_REMOUNTING_SIGTERM ||
 544                  state == MOUNT_REMOUNTING_SIGKILL ||
 545                  state == MOUNT_UNMOUNTING_SIGTERM ||
 546                  state == MOUNT_UNMOUNTING_SIGKILL ||
 547                  state == MOUNT_FAILED)
 548                 mount_notify_automount(m, -ENODEV);
 549
 550         if (state != old_state)
 551                 log_debug("%s changed %s -> %s",
 552                           m->meta.id,
 553                           mount_state_to_string(old_state),
 554                           mount_state_to_string(state));
 555
 556         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 557 }
 558
 559 static int mount_coldplug(Unit *u) {
 560         Mount *m = MOUNT(u);
 561         MountState new_state = MOUNT_DEAD;
 562         int r;
 563
 564         assert(m);
 565         assert(m->state == MOUNT_DEAD);
 566
 567         if (m->deserialized_state != m->state)
 568                 new_state = m->deserialized_state;
 569         else if (m->from_proc_self_mountinfo)
 570                 new_state = MOUNT_MOUNTED;
 571
 572         if (new_state != m->state) {
 573
 574                 if (new_state == MOUNT_MOUNTING ||
 575                     new_state == MOUNT_MOUNTING_DONE ||
 576                     new_state == MOUNT_REMOUNTING ||
 577                     new_state == MOUNT_UNMOUNTING ||
 578                     new_state == MOUNT_MOUNTING_SIGTERM ||
 579                     new_state == MOUNT_MOUNTING_SIGKILL ||
 580                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 581                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 582                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 583                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 584
 585                         if (m->control_pid <= 0)
 586                                 return -EBADMSG;
 587
 588                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 589                                 return r;
 590
 591                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 592                                 return r;
 593                 }
 594
 595                 mount_set_state(m, new_state);
 596         }
 597
 598         return 0;
 599 }
 600
 601 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 602         Mount *m = MOUNT(u);
 603         MountParameters *p;
 604
 605         assert(m);
 606         assert(f);
 607
 608         if (m->from_proc_self_mountinfo)
 609                 p = &m->parameters_proc_self_mountinfo;
 610         else if (m->from_fragment)
 611                 p = &m->parameters_fragment;
 612         else
 613                 p = &m->parameters_etc_fstab;
 614
 615         fprintf(f,
 616                 "%sMount State: %s\n"
 617                 "%sWhere: %s\n"
 618                 "%sWhat: %s\n"
 619                 "%sFile System Type: %s\n"
 620                 "%sOptions: %s\n"
 621                 "%sFrom /etc/fstab: %s\n"
 622                 "%sFrom /proc/self/mountinfo: %s\n"
 623                 "%sFrom fragment: %s\n"
 624                 "%sDirectoryMode: %04o\n",
 625                 prefix, mount_state_to_string(m->state),
 626                 prefix, m->where,
 627                 prefix, strna(p->what),
 628                 prefix, strna(p->fstype),
 629                 prefix, strna(p->options),
 630                 prefix, yes_no(m->from_etc_fstab),
 631                 prefix, yes_no(m->from_proc_self_mountinfo),
 632                 prefix, yes_no(m->from_fragment),
 633                 prefix, m->directory_mode);
 634
 635         if (m->control_pid > 0)
 636                 fprintf(f,
 637                         "%sControl PID: %lu\n",
 638                         prefix, (unsigned long) m->control_pid);
 639
 640         exec_context_dump(&m->exec_context, f, prefix);
 641 }
 642
 643 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 644         pid_t pid;
 645         int r;
 646
 647         assert(m);
 648         assert(c);
 649         assert(_pid);
 650
 651         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 652                 goto fail;
 653
 654         if ((r = exec_spawn(c,
 655                             NULL,
 656                             &m->exec_context,
 657                             NULL, 0,
 658                             m->meta.manager->environment,
 659                             true,
 660                             true,
 661                             true,
 662                             m->meta.manager->confirm_spawn,
 663                             m->meta.cgroup_bondings,
 664                             &pid)) < 0)
 665                 goto fail;
 666
 667         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 668                 /* FIXME: we need to do something here */
 669                 goto fail;
 670
 671         *_pid = pid;
 672
 673         return 0;
 674
 675 fail:
 676         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 677
 678         return r;
 679 }
 680
 681 static void mount_enter_dead(Mount *m, bool success) {
 682         assert(m);
 683
 684         if (!success)
 685                 m->failure = true;
 686
 687         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 688 }
 689
 690 static void mount_enter_mounted(Mount *m, bool success) {
 691         assert(m);
 692
 693         if (!success)
 694                 m->failure = true;
 695
 696         mount_set_state(m, MOUNT_MOUNTED);
 697 }
 698
 699 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 700         int r;
 701         Set *pid_set = NULL;
 702         bool wait_for_exit = false;
 703
 704         assert(m);
 705
 706         if (!success)
 707                 m->failure = true;
 708
 709         if (m->exec_context.kill_mode != KILL_NONE) {
 710                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 711                            state == MOUNT_UNMOUNTING_SIGTERM ||
 712                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 713
 714                 if (m->control_pid > 0) {
 715                         if (kill(m->exec_context.kill_mode == KILL_PROCESS_GROUP ?
 716                                  -m->control_pid :
 717                                  m->control_pid, sig) < 0 && errno != ESRCH)
 718
 719                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 720                         else
 721                                 wait_for_exit = true;
 722                 }
 723
 724                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 725
 726                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 727                                 r = -ENOMEM;
 728                                 goto fail;
 729                         }
 730
 731                         /* Exclude the control pid from being killed via the cgroup */
 732                         if (m->control_pid > 0)
 733                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 734                                         goto fail;
 735
 736                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, pid_set)) < 0) {
 737                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 738                                         log_warning("Failed to kill control group: %s", strerror(-r));
 739                         } else if (r > 0)
 740                                 wait_for_exit = true;
 741
 742                         set_free(pid_set);
 743                 }
 744         }
 745
 746         if (wait_for_exit) {
 747                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 748                         goto fail;
 749
 750                 mount_set_state(m, state);
 751         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 752                 mount_enter_mounted(m, true);
 753         else
 754                 mount_enter_dead(m, true);
 755
 756         return;
 757
 758 fail:
 759         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 760
 761         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 762                 mount_enter_mounted(m, false);
 763         else
 764                 mount_enter_dead(m, false);
 765
 766         if (pid_set)
 767                 set_free(pid_set);
 768 }
 769
 770 static void mount_enter_unmounting(Mount *m, bool success) {
 771         int r;
 772
 773         assert(m);
 774
 775         if (!success)
 776                 m->failure = true;
 777
 778         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 779         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 780
 781         if ((r = exec_command_set(
 782                              m->control_command,
 783                              "/bin/umount",
 784                              m->where,
 785                              NULL)) < 0)
 786                 goto fail;
 787
 788         mount_unwatch_control_pid(m);
 789
 790         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 791                 goto fail;
 792
 793         mount_set_state(m, MOUNT_UNMOUNTING);
 794
 795         return;
 796
 797 fail:
 798         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 799         mount_enter_mounted(m, false);
 800 }
 801
 802 static void mount_enter_mounting(Mount *m) {
 803         int r;
 804
 805         assert(m);
 806
 807         m->control_command_id = MOUNT_EXEC_MOUNT;
 808         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 809
 810         mkdir_p(m->where, m->directory_mode);
 811
 812         if (m->from_fragment)
 813                 r = exec_command_set(
 814                                 m->control_command,
 815                                 "/bin/mount",
 816                                 m->parameters_fragment.what,
 817                                 m->where,
 818                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 819                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 820                                 NULL);
 821         else if (m->from_etc_fstab)
 822                 r = exec_command_set(
 823                                 m->control_command,
 824                                 "/bin/mount",
 825                                 m->where,
 826                                 NULL);
 827         else
 828                 r = -ENOENT;
 829
 830         if (r < 0)
 831                 goto fail;
 832
 833         mount_unwatch_control_pid(m);
 834
 835         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 836                 goto fail;
 837
 838         mount_set_state(m, MOUNT_MOUNTING);
 839
 840         return;
 841
 842 fail:
 843         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 844         mount_enter_dead(m, false);
 845 }
 846
 847 static void mount_enter_mounting_done(Mount *m) {
 848         assert(m);
 849
 850         mount_set_state(m, MOUNT_MOUNTING_DONE);
 851 }
 852
 853 static void mount_enter_remounting(Mount *m, bool success) {
 854         int r;
 855
 856         assert(m);
 857
 858         if (!success)
 859                 m->failure = true;
 860
 861         m->control_command_id = MOUNT_EXEC_REMOUNT;
 862         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 863
 864         if (m->from_fragment) {
 865                 char *buf = NULL;
 866                 const char *o;
 867
 868                 if (m->parameters_fragment.options) {
 869                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 870                                 r = -ENOMEM;
 871                                 goto fail;
 872                         }
 873
 874                         o = buf;
 875                 } else
 876                         o = "remount";
 877
 878                 r = exec_command_set(
 879                                 m->control_command,
 880                                 "/bin/mount",
 881                                 m->parameters_fragment.what,
 882                                 m->where,
 883                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 884                                 "-o", o,
 885                                 NULL);
 886
 887                 free(buf);
 888         } else if (m->from_etc_fstab)
 889                 r = exec_command_set(
 890                                 m->control_command,
 891                                 "/bin/mount",
 892                                 m->where,
 893                                 "-o", "remount",
 894                                 NULL);
 895         else
 896                 r = -ENOENT;
 897
 898         if (r < 0)
 899                 goto fail;
 900
 901         mount_unwatch_control_pid(m);
 902
 903         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 904                 goto fail;
 905
 906         mount_set_state(m, MOUNT_REMOUNTING);
 907
 908         return;
 909
 910 fail:
 911         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 912         mount_enter_mounted(m, false);
 913 }
 914
 915 static int mount_start(Unit *u) {
 916         Mount *m = MOUNT(u);
 917
 918         assert(m);
 919
 920         /* We cannot fulfill this request right now, try again later
 921          * please! */
 922         if (m->state == MOUNT_UNMOUNTING ||
 923             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 924             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 925             m->state == MOUNT_MOUNTING_SIGTERM ||
 926             m->state == MOUNT_MOUNTING_SIGKILL)
 927                 return -EAGAIN;
 928
 929         /* Already on it! */
 930         if (m->state == MOUNT_MOUNTING)
 931                 return 0;
 932
 933         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
 934
 935         m->failure = false;
 936         mount_enter_mounting(m);
 937         return 0;
 938 }
 939
 940 static int mount_stop(Unit *u) {
 941         Mount *m = MOUNT(u);
 942
 943         assert(m);
 944
 945         /* Already on it */
 946         if (m->state == MOUNT_UNMOUNTING ||
 947             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 948             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 949             m->state == MOUNT_MOUNTING_SIGTERM ||
 950             m->state == MOUNT_MOUNTING_SIGKILL)
 951                 return 0;
 952
 953         assert(m->state == MOUNT_MOUNTING ||
 954                m->state == MOUNT_MOUNTING_DONE ||
 955                m->state == MOUNT_MOUNTED ||
 956                m->state == MOUNT_REMOUNTING ||
 957                m->state == MOUNT_REMOUNTING_SIGTERM ||
 958                m->state == MOUNT_REMOUNTING_SIGKILL);
 959
 960         mount_enter_unmounting(m, true);
 961         return 0;
 962 }
 963
 964 static int mount_reload(Unit *u) {
 965         Mount *m = MOUNT(u);
 966
 967         assert(m);
 968
 969         if (m->state == MOUNT_MOUNTING_DONE)
 970                 return -EAGAIN;
 971
 972         assert(m->state == MOUNT_MOUNTED);
 973
 974         mount_enter_remounting(m, true);
 975         return 0;
 976 }
 977
 978 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
 979         Mount *m = MOUNT(u);
 980
 981         assert(m);
 982         assert(f);
 983         assert(fds);
 984
 985         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
 986         unit_serialize_item(u, f, "failure", yes_no(m->failure));
 987
 988         if (m->control_pid > 0)
 989                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
 990
 991         if (m->control_command_id >= 0)
 992                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
 993
 994         return 0;
 995 }
 996
 997 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
 998         Mount *m = MOUNT(u);
 999
1000         assert(u);
1001         assert(key);
1002         assert(value);
1003         assert(fds);
1004
1005         if (streq(key, "state")) {
1006                 MountState state;
1007
1008                 if ((state = mount_state_from_string(value)) < 0)
1009                         log_debug("Failed to parse state value %s", value);
1010                 else
1011                         m->deserialized_state = state;
1012         } else if (streq(key, "failure")) {
1013                 int b;
1014
1015                 if ((b = parse_boolean(value)) < 0)
1016                         log_debug("Failed to parse failure value %s", value);
1017                 else
1018                         m->failure = b || m->failure;
1019
1020         } else if (streq(key, "control-pid")) {
1021                 pid_t pid;
1022
1023                 if (parse_pid(value, &pid) < 0)
1024                         log_debug("Failed to parse control-pid value %s", value);
1025                 else
1026                         m->control_pid = pid;
1027         } else if (streq(key, "control-command")) {
1028                 MountExecCommand id;
1029
1030                 if ((id = mount_exec_command_from_string(value)) < 0)
1031                         log_debug("Failed to parse exec-command value %s", value);
1032                 else {
1033                         m->control_command_id = id;
1034                         m->control_command = m->exec_command + id;
1035                 }
1036
1037         } else
1038                 log_debug("Unknown serialization key '%s'", key);
1039
1040         return 0;
1041 }
1042
1043 static UnitActiveState mount_active_state(Unit *u) {
1044         assert(u);
1045
1046         return state_translation_table[MOUNT(u)->state];
1047 }
1048
1049 static const char *mount_sub_state_to_string(Unit *u) {
1050         assert(u);
1051
1052         return mount_state_to_string(MOUNT(u)->state);
1053 }
1054
1055 static bool mount_check_gc(Unit *u) {
1056         Mount *m = MOUNT(u);
1057
1058         assert(m);
1059
1060         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1061 }
1062
1063 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1064         Mount *m = MOUNT(u);
1065         bool success;
1066
1067         assert(m);
1068         assert(pid >= 0);
1069
1070         if (pid != m->control_pid)
1071                 return;
1072
1073         m->control_pid = 0;
1074
1075         success = is_clean_exit(code, status);
1076         m->failure = m->failure || !success;
1077
1078         if (m->control_command) {
1079                 exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id);
1080                 m->control_command = NULL;
1081                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1082         }
1083
1084         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1085                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1086
1087         /* Note that mount(8) returning and the kernel sending us a
1088          * mount table change event might happen out-of-order. If an
1089          * operation succeed we assume the kernel will follow soon too
1090          * and already change into the resulting state.  If it fails
1091          * we check if the kernel still knows about the mount. and
1092          * change state accordingly. */
1093
1094         switch (m->state) {
1095
1096         case MOUNT_MOUNTING:
1097         case MOUNT_MOUNTING_DONE:
1098         case MOUNT_MOUNTING_SIGKILL:
1099         case MOUNT_MOUNTING_SIGTERM:
1100         case MOUNT_REMOUNTING:
1101         case MOUNT_REMOUNTING_SIGKILL:
1102         case MOUNT_REMOUNTING_SIGTERM:
1103
1104                 if (success)
1105                         mount_enter_mounted(m, true);
1106                 else if (m->from_proc_self_mountinfo)
1107                         mount_enter_mounted(m, false);
1108                 else
1109                         mount_enter_dead(m, false);
1110                 break;
1111
1112         case MOUNT_UNMOUNTING:
1113         case MOUNT_UNMOUNTING_SIGKILL:
1114         case MOUNT_UNMOUNTING_SIGTERM:
1115
1116                 if (success)
1117                         mount_enter_dead(m, true);
1118                 else if (m->from_proc_self_mountinfo)
1119                         mount_enter_mounted(m, false);
1120                 else
1121                         mount_enter_dead(m, false);
1122                 break;
1123
1124         default:
1125                 assert_not_reached("Uh, control process died at wrong time.");
1126         }
1127
1128         /* Notify clients about changed exit status */
1129         unit_add_to_dbus_queue(u);
1130 }
1131
1132 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1133         Mount *m = MOUNT(u);
1134
1135         assert(m);
1136         assert(elapsed == 1);
1137         assert(w == &m->timer_watch);
1138
1139         switch (m->state) {
1140
1141         case MOUNT_MOUNTING:
1142         case MOUNT_MOUNTING_DONE:
1143                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1144                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1145                 break;
1146
1147         case MOUNT_REMOUNTING:
1148                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1149                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
1150                 break;
1151
1152         case MOUNT_UNMOUNTING:
1153                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1154                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1155                 break;
1156
1157         case MOUNT_MOUNTING_SIGTERM:
1158                 log_warning("%s mounting timed out. Killing.", u->meta.id);
1159                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1160                 break;
1161
1162         case MOUNT_REMOUNTING_SIGTERM:
1163                 log_warning("%s remounting timed out. Killing.", u->meta.id);
1164                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1165                 break;
1166
1167         case MOUNT_UNMOUNTING_SIGTERM:
1168                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
1169                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1170                 break;
1171
1172         case MOUNT_MOUNTING_SIGKILL:
1173         case MOUNT_REMOUNTING_SIGKILL:
1174         case MOUNT_UNMOUNTING_SIGKILL:
1175                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1176
1177                 if (m->from_proc_self_mountinfo)
1178                         mount_enter_mounted(m, false);
1179                 else
1180                         mount_enter_dead(m, false);
1181                 break;
1182
1183         default:
1184                 assert_not_reached("Timeout at wrong time.");
1185         }
1186 }
1187
1188 static int mount_add_one(
1189                 Manager *m,
1190                 const char *what,
1191                 const char *where,
1192                 const char *options,
1193                 const char *fstype,
1194                 int passno,
1195                 bool from_proc_self_mountinfo,
1196                 bool set_flags) {
1197         int r;
1198         Unit *u;
1199         bool delete;
1200         char *e, *w = NULL, *o = NULL, *f = NULL;
1201         MountParameters *p;
1202
1203         assert(m);
1204         assert(what);
1205         assert(where);
1206         assert(options);
1207         assert(fstype);
1208
1209         assert(!set_flags || from_proc_self_mountinfo);
1210
1211         /* Ignore API mount points. They should never be referenced in
1212          * dependencies ever. */
1213         if (mount_point_is_api(where))
1214                 return 0;
1215
1216         if (streq(fstype, "autofs"))
1217                 return 0;
1218
1219         /* probably some kind of swap, ignore */
1220         if (!is_path(where))
1221                 return 0;
1222
1223         if (!(e = unit_name_from_path(where, ".mount")))
1224                 return -ENOMEM;
1225
1226         if (!(u = manager_get_unit(m, e))) {
1227                 delete = true;
1228
1229                 if (!(u = unit_new(m))) {
1230                         free(e);
1231                         return -ENOMEM;
1232                 }
1233
1234                 r = unit_add_name(u, e);
1235                 free(e);
1236
1237                 if (r < 0)
1238                         goto fail;
1239
1240                 if (!(MOUNT(u)->where = strdup(where))) {
1241                         r = -ENOMEM;
1242                         goto fail;
1243                 }
1244
1245                 unit_add_to_load_queue(u);
1246         } else {
1247                 delete = false;
1248                 free(e);
1249         }
1250
1251         if (!(w = strdup(what)) ||
1252             !(o = strdup(options)) ||
1253             !(f = strdup(fstype))) {
1254                 r = -ENOMEM;
1255                 goto fail;
1256         }
1257
1258         if (from_proc_self_mountinfo) {
1259                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1260
1261                 if (set_flags) {
1262                         MOUNT(u)->is_mounted = true;
1263                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1264                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1265                 }
1266
1267                 MOUNT(u)->from_proc_self_mountinfo = true;
1268         } else {
1269                 p = &MOUNT(u)->parameters_etc_fstab;
1270                 MOUNT(u)->from_etc_fstab = true;
1271         }
1272
1273         free(p->what);
1274         p->what = w;
1275
1276         free(p->options);
1277         p->options = o;
1278
1279         free(p->fstype);
1280         p->fstype = f;
1281
1282         p->passno = passno;
1283
1284         unit_add_to_dbus_queue(u);
1285
1286         return 0;
1287
1288 fail:
1289         free(w);
1290         free(o);
1291         free(f);
1292
1293         if (delete && u)
1294                 unit_free(u);
1295
1296         return r;
1297 }
1298
1299 static char *fstab_node_to_udev_node(char *p) {
1300         char *dn, *t, *u;
1301         int r;
1302
1303         /* FIXME: to follow udev's logic 100% we need to leave valid
1304          * UTF8 chars unescaped */
1305
1306         if (startswith(p, "LABEL=")) {
1307
1308                 if (!(u = unquote(p+6, "\"\'")))
1309                         return NULL;
1310
1311                 t = xescape(u, "/ ");
1312                 free(u);
1313
1314                 if (!t)
1315                         return NULL;
1316
1317                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
1318                 free(t);
1319
1320                 if (r < 0)
1321                         return NULL;
1322
1323                 return dn;
1324         }
1325
1326         if (startswith(p, "UUID=")) {
1327
1328                 if (!(u = unquote(p+5, "\"\'")))
1329                         return NULL;
1330
1331                 t = xescape(u, "/ ");
1332                 free(u);
1333
1334                 if (!t)
1335                         return NULL;
1336
1337                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
1338                 free(t);
1339
1340                 if (r < 0)
1341                         return NULL;
1342
1343                 return dn;
1344         }
1345
1346         return strdup(p);
1347 }
1348
1349 static int mount_find_pri(char *options) {
1350         char *end, *pri;
1351         unsigned long r;
1352
1353         if (!(pri = mount_test_option(options, "pri=")))
1354                 return 0;
1355
1356         pri += 4;
1357
1358         errno = 0;
1359         r = strtoul(pri, &end, 10);
1360
1361         if (errno != 0)
1362                 return -errno;
1363
1364         if (end == pri || (*end != ',' && *end != 0))
1365                 return -EINVAL;
1366
1367         return (int) r;
1368 }
1369
1370 static int mount_load_etc_fstab(Manager *m) {
1371         FILE *f;
1372         int r = 0;
1373         struct mntent* me;
1374
1375         assert(m);
1376
1377         errno = 0;
1378         if (!(f = setmntent("/etc/fstab", "r")))
1379                 return -errno;
1380
1381         while ((me = getmntent(f))) {
1382                 char *where, *what;
1383                 int k;
1384
1385                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1386                         r = -ENOMEM;
1387                         goto finish;
1388                 }
1389
1390                 if (!(where = strdup(me->mnt_dir))) {
1391                         free(what);
1392                         r = -ENOMEM;
1393                         goto finish;
1394                 }
1395
1396                 if (what[0] == '/')
1397                         path_kill_slashes(what);
1398
1399                 if (where[0] == '/')
1400                         path_kill_slashes(where);
1401
1402                 if (streq(me->mnt_type, "swap")) {
1403                         int pri;
1404
1405                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1406                                 k = pri;
1407                         else
1408                                 k = swap_add_one(m,
1409                                                  what,
1410                                                  NULL,
1411                                                  pri,
1412                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1413                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1414                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1415                                                  false);
1416                 } else
1417                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1418
1419                 free(what);
1420                 free(where);
1421
1422                 if (r < 0)
1423                         r = k;
1424         }
1425
1426 finish:
1427
1428         endmntent(f);
1429         return r;
1430 }
1431
1432 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1433         int r = 0;
1434         unsigned i;
1435         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1436
1437         assert(m);
1438
1439         rewind(m->proc_self_mountinfo);
1440
1441         for (i = 1;; i++) {
1442                 int k;
1443
1444                 device = path = options = options2 = fstype = d = p = o = NULL;
1445
1446                 if ((k = fscanf(m->proc_self_mountinfo,
1447                                 "%*s "       /* (1) mount id */
1448                                 "%*s "       /* (2) parent id */
1449                                 "%*s "       /* (3) major:minor */
1450                                 "%*s "       /* (4) root */
1451                                 "%ms "       /* (5) mount point */
1452                                 "%ms"        /* (6) mount options */
1453                                 "%*[^-]"     /* (7) optional fields */
1454                                 "- "         /* (8) separator */
1455                                 "%ms "       /* (9) file system type */
1456                                 "%ms"        /* (10) mount source */
1457                                 "%ms"        /* (11) mount options 2 */
1458                                 "%*[^\n]",   /* some rubbish at the end */
1459                                 &path,
1460                                 &options,
1461                                 &fstype,
1462                                 &device,
1463                                 &options2)) != 5) {
1464
1465                         if (k == EOF)
1466                                 break;
1467
1468                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1469                         goto clean_up;
1470                 }
1471
1472                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1473                         r = -ENOMEM;
1474                         goto finish;
1475                 }
1476
1477                 if (!(d = cunescape(device)) ||
1478                     !(p = cunescape(path))) {
1479                         r = -ENOMEM;
1480                         goto finish;
1481                 }
1482
1483                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1484                         r = k;
1485
1486 clean_up:
1487                 free(device);
1488                 free(path);
1489                 free(options);
1490                 free(options2);
1491                 free(fstype);
1492                 free(d);
1493                 free(p);
1494                 free(o);
1495         }
1496
1497 finish:
1498         free(device);
1499         free(path);
1500         free(options);
1501         free(options2);
1502         free(fstype);
1503         free(d);
1504         free(p);
1505         free(o);
1506
1507         return r;
1508 }
1509
1510 static void mount_shutdown(Manager *m) {
1511         assert(m);
1512
1513         if (m->proc_self_mountinfo) {
1514                 fclose(m->proc_self_mountinfo);
1515                 m->proc_self_mountinfo = NULL;
1516         }
1517 }
1518
1519 static int mount_enumerate(Manager *m) {
1520         int r;
1521         struct epoll_event ev;
1522         assert(m);
1523
1524         if (!m->proc_self_mountinfo) {
1525                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1526                         return -errno;
1527
1528                 m->mount_watch.type = WATCH_MOUNT;
1529                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1530
1531                 zero(ev);
1532                 ev.events = EPOLLPRI;
1533                 ev.data.ptr = &m->mount_watch;
1534
1535                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1536                         return -errno;
1537         }
1538
1539         if ((r = mount_load_etc_fstab(m)) < 0)
1540                 goto fail;
1541
1542         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1543                 goto fail;
1544
1545         return 0;
1546
1547 fail:
1548         mount_shutdown(m);
1549         return r;
1550 }
1551
1552 void mount_fd_event(Manager *m, int events) {
1553         Meta *meta;
1554         int r;
1555
1556         assert(m);
1557         assert(events & EPOLLPRI);
1558
1559         /* The manager calls this for every fd event happening on the
1560          * /proc/self/mountinfo file, which informs us about mounting
1561          * table changes */
1562
1563         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1564                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1565
1566                 /* Reset flags, just in case, for later calls */
1567                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1568                         Mount *mount = (Mount*) meta;
1569
1570                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1571                 }
1572
1573                 return;
1574         }
1575
1576         manager_dispatch_load_queue(m);
1577
1578         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1579                 Mount *mount = (Mount*) meta;
1580
1581                 if (!mount->is_mounted) {
1582                         /* This has just been unmounted. */
1583
1584                         mount->from_proc_self_mountinfo = false;
1585
1586                         switch (mount->state) {
1587
1588                         case MOUNT_MOUNTED:
1589                                 mount_enter_dead(mount, true);
1590                                 break;
1591
1592                         default:
1593                                 mount_set_state(mount, mount->state);
1594                                 break;
1595
1596                         }
1597
1598                 } else if (mount->just_mounted || mount->just_changed) {
1599
1600                         /* New or changed mount entry */
1601
1602                         switch (mount->state) {
1603
1604                         case MOUNT_DEAD:
1605                         case MOUNT_FAILED:
1606                                 mount_enter_mounted(mount, true);
1607                                 break;
1608
1609                         case MOUNT_MOUNTING:
1610                                 mount_enter_mounting_done(mount);
1611                                 break;
1612
1613                         default:
1614                                 /* Nothing really changed, but let's
1615                                  * issue an notification call
1616                                  * nonetheless, in case somebody is
1617                                  * waiting for this. (e.g. file system
1618                                  * ro/rw remounts.) */
1619                                 mount_set_state(mount, mount->state);
1620                                 break;
1621                         }
1622                 }
1623
1624                 /* Reset the flags for later calls */
1625                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1626         }
1627 }
1628
1629 static void mount_reset_failed(Unit *u) {
1630         Mount *m = MOUNT(u);
1631
1632         assert(m);
1633
1634         if (m->state == MOUNT_FAILED)
1635                 mount_set_state(m, MOUNT_DEAD);
1636
1637         m->failure = false;
1638 }
1639
1640 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1641         Mount *m = MOUNT(u);
1642         int r = 0;
1643         Set *pid_set = NULL;
1644
1645         assert(m);
1646
1647         if (who == KILL_MAIN) {
1648                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1649                 return -EINVAL;
1650         }
1651
1652         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1653                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1654                 return -ENOENT;
1655         }
1656
1657         if (m->control_pid > 0)
1658                 if (kill(mode == KILL_PROCESS_GROUP ? -m->control_pid : m->control_pid, signo) < 0)
1659                         r = -errno;
1660
1661         if (mode == KILL_CONTROL_GROUP) {
1662                 int q;
1663
1664                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1665                         return -ENOMEM;
1666
1667                 /* Exclude the control pid from being killed via the cgroup */
1668                 if (m->control_pid > 0)
1669                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1670                                 r = q;
1671                                 goto finish;
1672                         }
1673
1674                 if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, pid_set)) < 0)
1675                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1676                                 r = q;
1677         }
1678
1679 finish:
1680         if (pid_set)
1681                 set_free(pid_set);
1682
1683         return r;
1684 }
1685
1686 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1687         [MOUNT_DEAD] = "dead",
1688         [MOUNT_MOUNTING] = "mounting",
1689         [MOUNT_MOUNTING_DONE] = "mounting-done",
1690         [MOUNT_MOUNTED] = "mounted",
1691         [MOUNT_REMOUNTING] = "remounting",
1692         [MOUNT_UNMOUNTING] = "unmounting",
1693         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1694         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1695         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1696         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1697         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1698         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1699         [MOUNT_FAILED] = "failed"
1700 };
1701
1702 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1703
1704 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1705         [MOUNT_EXEC_MOUNT] = "ExecMount",
1706         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1707         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1708 };
1709
1710 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1711
1712 const UnitVTable mount_vtable = {
1713         .suffix = ".mount",
1714
1715         .no_alias = true,
1716         .no_instances = true,
1717         .no_isolate = true,
1718         .show_status = true,
1719
1720         .init = mount_init,
1721         .load = mount_load,
1722         .done = mount_done,
1723
1724         .coldplug = mount_coldplug,
1725
1726         .dump = mount_dump,
1727
1728         .start = mount_start,
1729         .stop = mount_stop,
1730         .reload = mount_reload,
1731
1732         .kill = mount_kill,
1733
1734         .serialize = mount_serialize,
1735         .deserialize_item = mount_deserialize_item,
1736
1737         .active_state = mount_active_state,
1738         .sub_state_to_string = mount_sub_state_to_string,
1739
1740         .check_gc = mount_check_gc,
1741
1742         .sigchld_event = mount_sigchld_event,
1743         .timer_event = mount_timer_event,
1744
1745         .reset_failed = mount_reset_failed,
1746
1747         .bus_interface = "org.freedesktop.systemd1.Mount",
1748         .bus_message_handler = bus_mount_message_handler,
1749         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1750
1751         .enumerate = mount_enumerate,
1752         .shutdown = mount_shutdown
1753 };