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