src/mount.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <mntent.h>
  25 #include <sys/epoll.h>
  26 #include <signal.h>
  27
  28 #include "unit.h"
  29 #include "mount.h"
  30 #include "load-fragment.h"
  31 #include "load-dropin.h"
  32 #include "log.h"
  33 #include "strv.h"
  34 #include "mount-setup.h"
  35 #include "unit-name.h"
  36 #include "dbus-mount.h"
  37 #include "special.h"
  38 #include "bus-errors.h"
  39 #include "exit-status.h"
  40 #include "def.h"
  41
  42 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  43         [MOUNT_DEAD] = UNIT_INACTIVE,
  44         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  45         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  46         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  47         [MOUNT_REMOUNTING] = UNIT_RELOADING,
  48         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  49         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  50         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  51         [MOUNT_REMOUNTING_SIGTERM] = UNIT_RELOADING,
  52         [MOUNT_REMOUNTING_SIGKILL] = UNIT_RELOADING,
  53         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  54         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  55         [MOUNT_FAILED] = UNIT_FAILED
  56 };
  57
  58 static void mount_init(Unit *u) {
  59         Mount *m = MOUNT(u);
  60
  61         assert(u);
  62         assert(u->meta.load_state == UNIT_STUB);
  63
  64         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
  65         m->directory_mode = 0755;
  66
  67         exec_context_init(&m->exec_context);
  68
  69         /* The stdio/kmsg bridge socket is on /, in order to avoid a
  70          * dep loop, don't use kmsg logging for -.mount */
  71         if (!unit_has_name(u, "-.mount"))
  72                 m->exec_context.std_output = EXEC_OUTPUT_KMSG;
  73
  74         /* We need to make sure that /bin/mount is always called in
  75          * the same process group as us, so that the autofs kernel
  76          * side doesn't send us another mount request while we are
  77          * already trying to comply its last one. */
  78         m->exec_context.same_pgrp = true;
  79
  80         m->timer_watch.type = WATCH_INVALID;
  81
  82         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
  83 }
  84
  85 static void mount_unwatch_control_pid(Mount *m) {
  86         assert(m);
  87
  88         if (m->control_pid <= 0)
  89                 return;
  90
  91         unit_unwatch_pid(UNIT(m), m->control_pid);
  92         m->control_pid = 0;
  93 }
  94
  95 static void mount_parameters_done(MountParameters *p) {
  96         assert(p);
  97
  98         free(p->what);
  99         free(p->options);
 100         free(p->fstype);
 101
 102         p->what = p->options = p->fstype = NULL;
 103 }
 104
 105 static void mount_done(Unit *u) {
 106         Mount *m = MOUNT(u);
 107         Meta *other;
 108
 109         assert(m);
 110
 111         free(m->where);
 112         m->where = NULL;
 113
 114         /* Try to detach us from the automount unit if there is any */
 115         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT]) {
 116                 Automount *a = (Automount*) other;
 117
 118                 if (a->mount == m)
 119                         a->mount = NULL;
 120         }
 121
 122         mount_parameters_done(&m->parameters_etc_fstab);
 123         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 124         mount_parameters_done(&m->parameters_fragment);
 125
 126         exec_context_done(&m->exec_context);
 127         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 128         m->control_command = NULL;
 129
 130         mount_unwatch_control_pid(m);
 131
 132         unit_unwatch_timer(u, &m->timer_watch);
 133 }
 134
 135 static MountParameters* get_mount_parameters_configured(Mount *m) {
 136         assert(m);
 137
 138         if (m->from_fragment)
 139                 return &m->parameters_fragment;
 140         else if (m->from_etc_fstab)
 141                 return &m->parameters_etc_fstab;
 142
 143         return NULL;
 144 }
 145
 146 static MountParameters* get_mount_parameters(Mount *m) {
 147         assert(m);
 148
 149         if (m->from_proc_self_mountinfo)
 150                 return &m->parameters_proc_self_mountinfo;
 151
 152         return get_mount_parameters_configured(m);
 153 }
 154
 155 static int mount_add_mount_links(Mount *m) {
 156         Meta *other;
 157         int r;
 158         MountParameters *pm;
 159
 160         assert(m);
 161
 162         pm = get_mount_parameters_configured(m);
 163
 164         /* Adds in links to other mount points that might lie below or
 165          * above us in the hierarchy */
 166
 167         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_MOUNT]) {
 168                 Mount *n = (Mount*) other;
 169                 MountParameters *pn;
 170
 171                 if (n == m)
 172                         continue;
 173
 174                 if (n->meta.load_state != UNIT_LOADED)
 175                         continue;
 176
 177                 pn = get_mount_parameters_configured(n);
 178
 179                 if (path_startswith(m->where, n->where)) {
 180
 181                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 182                                 return r;
 183
 184                         if (pn)
 185                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 186                                         return r;
 187
 188                 } else if (path_startswith(n->where, m->where)) {
 189
 190                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 191                                 return r;
 192
 193                         if (pm)
 194                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 195                                         return r;
 196
 197                 } else if (pm && path_startswith(pm->what, n->where)) {
 198
 199                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
 200                                 return r;
 201
 202                         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
 203                                 return r;
 204
 205                 } else if (pn && path_startswith(pn->what, m->where)) {
 206
 207                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
 208                                 return r;
 209
 210                         if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
 211                                 return r;
 212                 }
 213         }
 214
 215         return 0;
 216 }
 217
 218 static int mount_add_swap_links(Mount *m) {
 219         Meta *other;
 220         int r;
 221
 222         assert(m);
 223
 224         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SWAP])
 225                 if ((r = swap_add_one_mount_link((Swap*) other, m)) < 0)
 226                         return r;
 227
 228         return 0;
 229 }
 230
 231 static int mount_add_path_links(Mount *m) {
 232         Meta *other;
 233         int r;
 234
 235         assert(m);
 236
 237         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_PATH])
 238                 if ((r = path_add_one_mount_link((Path*) other, m)) < 0)
 239                         return r;
 240
 241         return 0;
 242 }
 243
 244 static int mount_add_automount_links(Mount *m) {
 245         Meta *other;
 246         int r;
 247
 248         assert(m);
 249
 250         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_AUTOMOUNT])
 251                 if ((r = automount_add_one_mount_link((Automount*) other, m)) < 0)
 252                         return r;
 253
 254         return 0;
 255 }
 256
 257 static int mount_add_socket_links(Mount *m) {
 258         Meta *other;
 259         int r;
 260
 261         assert(m);
 262
 263         LIST_FOREACH(units_per_type, other, m->meta.manager->units_per_type[UNIT_SOCKET])
 264                 if ((r = socket_add_one_mount_link((Socket*) other, m)) < 0)
 265                         return r;
 266
 267         return 0;
 268 }
 269
 270 static char* mount_test_option(const char *haystack, const char *needle) {
 271         struct mntent me;
 272
 273         assert(needle);
 274
 275         /* Like glibc's hasmntopt(), but works on a string, not a
 276          * struct mntent */
 277
 278         if (!haystack)
 279                 return false;
 280
 281         zero(me);
 282         me.mnt_opts = (char*) haystack;
 283
 284         return hasmntopt(&me, needle);
 285 }
 286
 287 static bool mount_is_network(MountParameters *p) {
 288         assert(p);
 289
 290         if (mount_test_option(p->options, "_netdev"))
 291                 return true;
 292
 293         if (p->fstype && fstype_is_network(p->fstype))
 294                 return true;
 295
 296         return false;
 297 }
 298
 299 static bool mount_is_bind(MountParameters *p) {
 300         assert(p);
 301
 302         if (mount_test_option(p->options, "bind"))
 303                 return true;
 304
 305         if (p->fstype && streq(p->fstype, "bind"))
 306                 return true;
 307
 308         return false;
 309 }
 310
 311 static bool needs_quota(MountParameters *p) {
 312         assert(p);
 313
 314         if (mount_is_network(p))
 315                 return false;
 316
 317         if (mount_is_bind(p))
 318                 return false;
 319
 320         return mount_test_option(p->options, "usrquota") ||
 321                 mount_test_option(p->options, "grpquota");
 322 }
 323
 324 static int mount_add_target_links(Mount *m) {
 325         const char *target, *after = NULL;
 326         MountParameters *p;
 327         Unit *tu;
 328         int r;
 329         bool noauto, nofail, handle, automount;
 330
 331         assert(m);
 332
 333         if (!(p = get_mount_parameters_configured(m)))
 334                 return 0;
 335
 336         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 337         nofail = !!mount_test_option(p->options, "nofail");
 338         handle =
 339                 mount_test_option(p->options, "comment=systemd.mount") ||
 340                 mount_test_option(p->options, "x-systemd-mount") ||
 341                 m->meta.manager->mount_auto;
 342         automount =
 343                 mount_test_option(p->options, "comment=systemd.automount") ||
 344                 mount_test_option(p->options, "x-systemd-automount");
 345
 346         if (mount_is_network(p)) {
 347                 target = SPECIAL_REMOTE_FS_TARGET;
 348
 349                 if (m->meta.manager->running_as == MANAGER_SYSTEM)
 350                         after = SPECIAL_NETWORK_TARGET;
 351         } else
 352                 target = SPECIAL_LOCAL_FS_TARGET;
 353
 354         if ((r = manager_load_unit(m->meta.manager, target, NULL, NULL, &tu)) < 0)
 355                 return r;
 356
 357         if (after)
 358                 if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0)
 359                         return r;
 360
 361         if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) {
 362                 Unit *am;
 363
 364                 if ((r = unit_load_related_unit(UNIT(m), ".automount", &am)) < 0)
 365                         return r;
 366
 367                 return unit_add_two_dependencies(tu, UNIT_AFTER, UNIT_WANTS, UNIT(am), true);
 368         } else {
 369
 370                 /* Automatically add mount points that aren't natively
 371                  * configured to local-fs.target */
 372                 if (!noauto &&
 373                     !nofail &&
 374                     handle &&
 375                     m->from_etc_fstab &&
 376                     m->meta.manager->running_as == MANAGER_SYSTEM)
 377                         if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(m), true)) < 0)
 378                                 return r;
 379
 380                 return unit_add_dependency(UNIT(m), UNIT_BEFORE, tu, true);
 381         }
 382 }
 383
 384 static int mount_add_device_links(Mount *m) {
 385         MountParameters *p;
 386         int r;
 387
 388         assert(m);
 389
 390         if (!(p = get_mount_parameters_configured(m)))
 391                 return 0;
 392
 393         if (!p->what)
 394                 return 0;
 395
 396         if (!mount_is_bind(p) && !path_equal(m->where, "/")) {
 397                 bool nofail, noauto;
 398
 399                 noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
 400                 nofail = !!mount_test_option(p->options, "nofail");
 401
 402                 if ((r = unit_add_node_link(UNIT(m), p->what,
 403                                             !noauto && nofail &&
 404                                             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)) < 0)
 405                         return r;
 406         }
 407
 408         if (p->passno > 0 &&
 409             !mount_is_bind(p) &&
 410             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM &&
 411             !path_equal(m->where, "/")) {
 412                 char *name;
 413                 Unit *fsck;
 414                 /* Let's add in the fsck service */
 415
 416                 /* aka SPECIAL_FSCK_SERVICE */
 417                 if (!(name = unit_name_from_path_instance("fsck", p->what, ".service")))
 418                         return -ENOMEM;
 419
 420                 if ((r = manager_load_unit_prepare(m->meta.manager, name, NULL, NULL, &fsck)) < 0) {
 421                         log_warning("Failed to prepare unit %s: %s", name, strerror(-r));
 422                         free(name);
 423                         return r;
 424                 }
 425
 426                 free(name);
 427
 428                 SERVICE(fsck)->fsck_passno = p->passno;
 429
 430                 if ((r = unit_add_two_dependencies(UNIT(m), UNIT_AFTER, UNIT_REQUIRES, fsck, true)) < 0)
 431                         return r;
 432         }
 433
 434         return 0;
 435 }
 436
 437 static int mount_add_default_dependencies(Mount *m) {
 438         int r;
 439
 440         assert(m);
 441
 442         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
 443             !path_equal(m->where, "/")) {
 444                 MountParameters *p;
 445
 446                 p = get_mount_parameters_configured(m);
 447
 448                 if (p && needs_quota(p)) {
 449                         if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
 450                             (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
 451                                 return r;
 452                 }
 453
 454                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
 455                         return r;
 456         }
 457
 458         return 0;
 459 }
 460
 461 static int mount_verify(Mount *m) {
 462         bool b;
 463         char *e;
 464         assert(m);
 465
 466         if (m->meta.load_state != UNIT_LOADED)
 467                 return 0;
 468
 469         if (!m->from_etc_fstab && !m->from_fragment && !m->from_proc_self_mountinfo)
 470                 return -ENOENT;
 471
 472         if (!(e = unit_name_from_path(m->where, ".mount")))
 473                 return -ENOMEM;
 474
 475         b = unit_has_name(UNIT(m), e);
 476         free(e);
 477
 478         if (!b) {
 479                 log_error("%s's Where setting doesn't match unit name. Refusing.", m->meta.id);
 480                 return -EINVAL;
 481         }
 482
 483         if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
 484                 log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
 485                 return -EINVAL;
 486         }
 487
 488         if (m->meta.fragment_path && !m->parameters_fragment.what) {
 489                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
 490                 return -EBADMSG;
 491         }
 492
 493         if (m->exec_context.pam_name && m->exec_context.kill_mode != KILL_CONTROL_GROUP) {
 494                 log_error("%s has PAM enabled. Kill mode must be set to 'control-group'. Refusing.", m->meta.id);
 495                 return -EINVAL;
 496         }
 497
 498         return 0;
 499 }
 500
 501 static int mount_load(Unit *u) {
 502         Mount *m = MOUNT(u);
 503         int r;
 504
 505         assert(u);
 506         assert(u->meta.load_state == UNIT_STUB);
 507
 508         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 509                 return r;
 510
 511         /* This is a new unit? Then let's add in some extras */
 512         if (u->meta.load_state == UNIT_LOADED) {
 513                 if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
 514                         return r;
 515
 516                 if (m->meta.fragment_path)
 517                         m->from_fragment = true;
 518
 519                 if (!m->where)
 520                         if (!(m->where = unit_name_to_path(u->meta.id)))
 521                                 return -ENOMEM;
 522
 523                 path_kill_slashes(m->where);
 524
 525                 if (!m->meta.description)
 526                         if ((r = unit_set_description(u, m->where)) < 0)
 527                                 return r;
 528
 529                 if ((r = mount_add_device_links(m)) < 0)
 530                         return r;
 531
 532                 if ((r = mount_add_mount_links(m)) < 0)
 533                         return r;
 534
 535                 if ((r = mount_add_socket_links(m)) < 0)
 536                         return r;
 537
 538                 if ((r = mount_add_swap_links(m)) < 0)
 539                         return r;
 540
 541                 if ((r = mount_add_path_links(m)) < 0)
 542                         return r;
 543
 544                 if ((r = mount_add_automount_links(m)) < 0)
 545                         return r;
 546
 547                 if ((r = mount_add_target_links(m)) < 0)
 548                         return r;
 549
 550                 if ((r = unit_add_default_cgroups(u)) < 0)
 551                         return r;
 552
 553                 if (m->meta.default_dependencies)
 554                         if ((r = mount_add_default_dependencies(m)) < 0)
 555                                 return r;
 556         }
 557
 558         return mount_verify(m);
 559 }
 560
 561 static int mount_notify_automount(Mount *m, int status) {
 562         Unit *p;
 563         int r;
 564
 565         assert(m);
 566
 567         if ((r = unit_get_related_unit(UNIT(m), ".automount", &p)) < 0)
 568                 return r == -ENOENT ? 0 : r;
 569
 570         return automount_send_ready(AUTOMOUNT(p), status);
 571 }
 572
 573 static void mount_set_state(Mount *m, MountState state) {
 574         MountState old_state;
 575         assert(m);
 576
 577         old_state = m->state;
 578         m->state = state;
 579
 580         if (state != MOUNT_MOUNTING &&
 581             state != MOUNT_MOUNTING_DONE &&
 582             state != MOUNT_REMOUNTING &&
 583             state != MOUNT_UNMOUNTING &&
 584             state != MOUNT_MOUNTING_SIGTERM &&
 585             state != MOUNT_MOUNTING_SIGKILL &&
 586             state != MOUNT_UNMOUNTING_SIGTERM &&
 587             state != MOUNT_UNMOUNTING_SIGKILL &&
 588             state != MOUNT_REMOUNTING_SIGTERM &&
 589             state != MOUNT_REMOUNTING_SIGKILL) {
 590                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 591                 mount_unwatch_control_pid(m);
 592                 m->control_command = NULL;
 593                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
 594         }
 595
 596         if (state == MOUNT_MOUNTED ||
 597             state == MOUNT_REMOUNTING)
 598                 mount_notify_automount(m, 0);
 599         else if (state == MOUNT_DEAD ||
 600                  state == MOUNT_UNMOUNTING ||
 601                  state == MOUNT_MOUNTING_SIGTERM ||
 602                  state == MOUNT_MOUNTING_SIGKILL ||
 603                  state == MOUNT_REMOUNTING_SIGTERM ||
 604                  state == MOUNT_REMOUNTING_SIGKILL ||
 605                  state == MOUNT_UNMOUNTING_SIGTERM ||
 606                  state == MOUNT_UNMOUNTING_SIGKILL ||
 607                  state == MOUNT_FAILED)
 608                 mount_notify_automount(m, -ENODEV);
 609
 610         if (state != old_state)
 611                 log_debug("%s changed %s -> %s",
 612                           m->meta.id,
 613                           mount_state_to_string(old_state),
 614                           mount_state_to_string(state));
 615
 616         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state], !m->reload_failure);
 617         m->reload_failure = false;
 618 }
 619
 620 static int mount_coldplug(Unit *u) {
 621         Mount *m = MOUNT(u);
 622         MountState new_state = MOUNT_DEAD;
 623         int r;
 624
 625         assert(m);
 626         assert(m->state == MOUNT_DEAD);
 627
 628         if (m->deserialized_state != m->state)
 629                 new_state = m->deserialized_state;
 630         else if (m->from_proc_self_mountinfo)
 631                 new_state = MOUNT_MOUNTED;
 632
 633         if (new_state != m->state) {
 634
 635                 if (new_state == MOUNT_MOUNTING ||
 636                     new_state == MOUNT_MOUNTING_DONE ||
 637                     new_state == MOUNT_REMOUNTING ||
 638                     new_state == MOUNT_UNMOUNTING ||
 639                     new_state == MOUNT_MOUNTING_SIGTERM ||
 640                     new_state == MOUNT_MOUNTING_SIGKILL ||
 641                     new_state == MOUNT_UNMOUNTING_SIGTERM ||
 642                     new_state == MOUNT_UNMOUNTING_SIGKILL ||
 643                     new_state == MOUNT_REMOUNTING_SIGTERM ||
 644                     new_state == MOUNT_REMOUNTING_SIGKILL) {
 645
 646                         if (m->control_pid <= 0)
 647                                 return -EBADMSG;
 648
 649                         if ((r = unit_watch_pid(UNIT(m), m->control_pid)) < 0)
 650                                 return r;
 651
 652                         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 653                                 return r;
 654                 }
 655
 656                 mount_set_state(m, new_state);
 657         }
 658
 659         return 0;
 660 }
 661
 662 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 663         Mount *m = MOUNT(u);
 664         MountParameters *p;
 665
 666         assert(m);
 667         assert(f);
 668
 669         p = get_mount_parameters(m);
 670
 671         fprintf(f,
 672                 "%sMount State: %s\n"
 673                 "%sWhere: %s\n"
 674                 "%sWhat: %s\n"
 675                 "%sFile System Type: %s\n"
 676                 "%sOptions: %s\n"
 677                 "%sFrom /etc/fstab: %s\n"
 678                 "%sFrom /proc/self/mountinfo: %s\n"
 679                 "%sFrom fragment: %s\n"
 680                 "%sDirectoryMode: %04o\n",
 681                 prefix, mount_state_to_string(m->state),
 682                 prefix, m->where,
 683                 prefix, strna(p->what),
 684                 prefix, strna(p->fstype),
 685                 prefix, strna(p->options),
 686                 prefix, yes_no(m->from_etc_fstab),
 687                 prefix, yes_no(m->from_proc_self_mountinfo),
 688                 prefix, yes_no(m->from_fragment),
 689                 prefix, m->directory_mode);
 690
 691         if (m->control_pid > 0)
 692                 fprintf(f,
 693                         "%sControl PID: %lu\n",
 694                         prefix, (unsigned long) m->control_pid);
 695
 696         exec_context_dump(&m->exec_context, f, prefix);
 697 }
 698
 699 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 700         pid_t pid;
 701         int r;
 702
 703         assert(m);
 704         assert(c);
 705         assert(_pid);
 706
 707         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 708                 goto fail;
 709
 710         if ((r = exec_spawn(c,
 711                             NULL,
 712                             &m->exec_context,
 713                             NULL, 0,
 714                             m->meta.manager->environment,
 715                             true,
 716                             true,
 717                             true,
 718                             m->meta.manager->confirm_spawn,
 719                             m->meta.cgroup_bondings,
 720                             &pid)) < 0)
 721                 goto fail;
 722
 723         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 724                 /* FIXME: we need to do something here */
 725                 goto fail;
 726
 727         *_pid = pid;
 728
 729         return 0;
 730
 731 fail:
 732         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 733
 734         return r;
 735 }
 736
 737 static void mount_enter_dead(Mount *m, bool success) {
 738         assert(m);
 739
 740         if (!success)
 741                 m->failure = true;
 742
 743         mount_set_state(m, m->failure ? MOUNT_FAILED : MOUNT_DEAD);
 744 }
 745
 746 static void mount_enter_mounted(Mount *m, bool success) {
 747         assert(m);
 748
 749         if (!success)
 750                 m->failure = true;
 751
 752         mount_set_state(m, MOUNT_MOUNTED);
 753 }
 754
 755 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 756         int r;
 757         Set *pid_set = NULL;
 758         bool wait_for_exit = false;
 759
 760         assert(m);
 761
 762         if (!success)
 763                 m->failure = true;
 764
 765         if (m->exec_context.kill_mode != KILL_NONE) {
 766                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 767                            state == MOUNT_UNMOUNTING_SIGTERM ||
 768                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 769
 770                 if (m->control_pid > 0) {
 771                         if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
 772
 773                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
 774                         else
 775                                 wait_for_exit = true;
 776                 }
 777
 778                 if (m->exec_context.kill_mode == KILL_CONTROL_GROUP) {
 779
 780                         if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func))) {
 781                                 r = -ENOMEM;
 782                                 goto fail;
 783                         }
 784
 785                         /* Exclude the control pid from being killed via the cgroup */
 786                         if (m->control_pid > 0)
 787                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
 788                                         goto fail;
 789
 790                         if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
 791                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
 792                                         log_warning("Failed to kill control group: %s", strerror(-r));
 793                         } else if (r > 0)
 794                                 wait_for_exit = true;
 795
 796                         set_free(pid_set);
 797                         pid_set = NULL;
 798                 }
 799         }
 800
 801         if (wait_for_exit) {
 802                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 803                         goto fail;
 804
 805                 mount_set_state(m, state);
 806         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 807                 mount_enter_mounted(m, true);
 808         else
 809                 mount_enter_dead(m, true);
 810
 811         return;
 812
 813 fail:
 814         log_warning("%s failed to kill processes: %s", m->meta.id, strerror(-r));
 815
 816         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 817                 mount_enter_mounted(m, false);
 818         else
 819                 mount_enter_dead(m, false);
 820
 821         if (pid_set)
 822                 set_free(pid_set);
 823 }
 824
 825 static void mount_enter_unmounting(Mount *m, bool success) {
 826         int r;
 827
 828         assert(m);
 829
 830         if (!success)
 831                 m->failure = true;
 832
 833         m->control_command_id = MOUNT_EXEC_UNMOUNT;
 834         m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
 835
 836         if ((r = exec_command_set(
 837                              m->control_command,
 838                              "/bin/umount",
 839                              m->where,
 840                              NULL)) < 0)
 841                 goto fail;
 842
 843         mount_unwatch_control_pid(m);
 844
 845         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 846                 goto fail;
 847
 848         mount_set_state(m, MOUNT_UNMOUNTING);
 849
 850         return;
 851
 852 fail:
 853         log_warning("%s failed to run 'umount' task: %s", m->meta.id, strerror(-r));
 854         mount_enter_mounted(m, false);
 855 }
 856
 857 static void mount_enter_mounting(Mount *m) {
 858         int r;
 859         MountParameters *p;
 860
 861         assert(m);
 862
 863         m->control_command_id = MOUNT_EXEC_MOUNT;
 864         m->control_command = m->exec_command + MOUNT_EXEC_MOUNT;
 865
 866         mkdir_p(m->where, m->directory_mode);
 867
 868         /* Create the source directory for bind-mounts if needed */
 869         p = get_mount_parameters_configured(m);
 870         if (p && mount_is_bind(p))
 871                 mkdir_p(p->what, m->directory_mode);
 872
 873         if (m->from_fragment)
 874                 r = exec_command_set(
 875                                 m->control_command,
 876                                 "/bin/mount",
 877                                 m->parameters_fragment.what,
 878                                 m->where,
 879                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 880                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 881                                 NULL);
 882         else if (m->from_etc_fstab)
 883                 r = exec_command_set(
 884                                 m->control_command,
 885                                 "/bin/mount",
 886                                 m->where,
 887                                 NULL);
 888         else
 889                 r = -ENOENT;
 890
 891         if (r < 0)
 892                 goto fail;
 893
 894         mount_unwatch_control_pid(m);
 895
 896         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 897                 goto fail;
 898
 899         mount_set_state(m, MOUNT_MOUNTING);
 900
 901         return;
 902
 903 fail:
 904         log_warning("%s failed to run 'mount' task: %s", m->meta.id, strerror(-r));
 905         mount_enter_dead(m, false);
 906 }
 907
 908 static void mount_enter_mounting_done(Mount *m) {
 909         assert(m);
 910
 911         mount_set_state(m, MOUNT_MOUNTING_DONE);
 912 }
 913
 914 static void mount_enter_remounting(Mount *m, bool success) {
 915         int r;
 916
 917         assert(m);
 918
 919         if (!success)
 920                 m->failure = true;
 921
 922         m->control_command_id = MOUNT_EXEC_REMOUNT;
 923         m->control_command = m->exec_command + MOUNT_EXEC_REMOUNT;
 924
 925         if (m->from_fragment) {
 926                 char *buf = NULL;
 927                 const char *o;
 928
 929                 if (m->parameters_fragment.options) {
 930                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 931                                 r = -ENOMEM;
 932                                 goto fail;
 933                         }
 934
 935                         o = buf;
 936                 } else
 937                         o = "remount";
 938
 939                 r = exec_command_set(
 940                                 m->control_command,
 941                                 "/bin/mount",
 942                                 m->parameters_fragment.what,
 943                                 m->where,
 944                                 "-t", m->parameters_fragment.fstype ? m->parameters_fragment.fstype : "auto",
 945                                 "-o", o,
 946                                 NULL);
 947
 948                 free(buf);
 949         } else if (m->from_etc_fstab)
 950                 r = exec_command_set(
 951                                 m->control_command,
 952                                 "/bin/mount",
 953                                 m->where,
 954                                 "-o", "remount",
 955                                 NULL);
 956         else
 957                 r = -ENOENT;
 958
 959         if (r < 0)
 960                 goto fail;
 961
 962         mount_unwatch_control_pid(m);
 963
 964         if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
 965                 goto fail;
 966
 967         mount_set_state(m, MOUNT_REMOUNTING);
 968
 969         return;
 970
 971 fail:
 972         log_warning("%s failed to run 'remount' task: %s", m->meta.id, strerror(-r));
 973         m->reload_failure = true;
 974         mount_enter_mounted(m, true);
 975 }
 976
 977 static int mount_start(Unit *u) {
 978         Mount *m = MOUNT(u);
 979
 980         assert(m);
 981
 982         /* We cannot fulfill this request right now, try again later
 983          * please! */
 984         if (m->state == MOUNT_UNMOUNTING ||
 985             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 986             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 987             m->state == MOUNT_MOUNTING_SIGTERM ||
 988             m->state == MOUNT_MOUNTING_SIGKILL)
 989                 return -EAGAIN;
 990
 991         /* Already on it! */
 992         if (m->state == MOUNT_MOUNTING)
 993                 return 0;
 994
 995         assert(m->state == MOUNT_DEAD || m->state == MOUNT_FAILED);
 996
 997         m->failure = false;
 998         mount_enter_mounting(m);
 999         return 0;
1000 }
1001
1002 static int mount_stop(Unit *u) {
1003         Mount *m = MOUNT(u);
1004
1005         assert(m);
1006
1007         /* Already on it */
1008         if (m->state == MOUNT_UNMOUNTING ||
1009             m->state == MOUNT_UNMOUNTING_SIGKILL ||
1010             m->state == MOUNT_UNMOUNTING_SIGTERM ||
1011             m->state == MOUNT_MOUNTING_SIGTERM ||
1012             m->state == MOUNT_MOUNTING_SIGKILL)
1013                 return 0;
1014
1015         assert(m->state == MOUNT_MOUNTING ||
1016                m->state == MOUNT_MOUNTING_DONE ||
1017                m->state == MOUNT_MOUNTED ||
1018                m->state == MOUNT_REMOUNTING ||
1019                m->state == MOUNT_REMOUNTING_SIGTERM ||
1020                m->state == MOUNT_REMOUNTING_SIGKILL);
1021
1022         mount_enter_unmounting(m, true);
1023         return 0;
1024 }
1025
1026 static int mount_reload(Unit *u) {
1027         Mount *m = MOUNT(u);
1028
1029         assert(m);
1030
1031         if (m->state == MOUNT_MOUNTING_DONE)
1032                 return -EAGAIN;
1033
1034         assert(m->state == MOUNT_MOUNTED);
1035
1036         mount_enter_remounting(m, true);
1037         return 0;
1038 }
1039
1040 static int mount_serialize(Unit *u, FILE *f, FDSet *fds) {
1041         Mount *m = MOUNT(u);
1042
1043         assert(m);
1044         assert(f);
1045         assert(fds);
1046
1047         unit_serialize_item(u, f, "state", mount_state_to_string(m->state));
1048         unit_serialize_item(u, f, "failure", yes_no(m->failure));
1049
1050         if (m->control_pid > 0)
1051                 unit_serialize_item_format(u, f, "control-pid", "%lu", (unsigned long) m->control_pid);
1052
1053         if (m->control_command_id >= 0)
1054                 unit_serialize_item(u, f, "control-command", mount_exec_command_to_string(m->control_command_id));
1055
1056         return 0;
1057 }
1058
1059 static int mount_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
1060         Mount *m = MOUNT(u);
1061
1062         assert(u);
1063         assert(key);
1064         assert(value);
1065         assert(fds);
1066
1067         if (streq(key, "state")) {
1068                 MountState state;
1069
1070                 if ((state = mount_state_from_string(value)) < 0)
1071                         log_debug("Failed to parse state value %s", value);
1072                 else
1073                         m->deserialized_state = state;
1074         } else if (streq(key, "failure")) {
1075                 int b;
1076
1077                 if ((b = parse_boolean(value)) < 0)
1078                         log_debug("Failed to parse failure value %s", value);
1079                 else
1080                         m->failure = b || m->failure;
1081
1082         } else if (streq(key, "control-pid")) {
1083                 pid_t pid;
1084
1085                 if (parse_pid(value, &pid) < 0)
1086                         log_debug("Failed to parse control-pid value %s", value);
1087                 else
1088                         m->control_pid = pid;
1089         } else if (streq(key, "control-command")) {
1090                 MountExecCommand id;
1091
1092                 if ((id = mount_exec_command_from_string(value)) < 0)
1093                         log_debug("Failed to parse exec-command value %s", value);
1094                 else {
1095                         m->control_command_id = id;
1096                         m->control_command = m->exec_command + id;
1097                 }
1098
1099         } else
1100                 log_debug("Unknown serialization key '%s'", key);
1101
1102         return 0;
1103 }
1104
1105 static UnitActiveState mount_active_state(Unit *u) {
1106         assert(u);
1107
1108         return state_translation_table[MOUNT(u)->state];
1109 }
1110
1111 static const char *mount_sub_state_to_string(Unit *u) {
1112         assert(u);
1113
1114         return mount_state_to_string(MOUNT(u)->state);
1115 }
1116
1117 static bool mount_check_gc(Unit *u) {
1118         Mount *m = MOUNT(u);
1119
1120         assert(m);
1121
1122         return m->from_etc_fstab || m->from_proc_self_mountinfo;
1123 }
1124
1125 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
1126         Mount *m = MOUNT(u);
1127         bool success;
1128
1129         assert(m);
1130         assert(pid >= 0);
1131
1132         if (pid != m->control_pid)
1133                 return;
1134
1135         m->control_pid = 0;
1136
1137         success = is_clean_exit(code, status);
1138         m->failure = m->failure || !success;
1139
1140         if (m->control_command) {
1141                 exec_status_exit(&m->control_command->exec_status, pid, code, status, m->exec_context.utmp_id);
1142                 m->control_command = NULL;
1143                 m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
1144         }
1145
1146         log_full(success ? LOG_DEBUG : LOG_NOTICE,
1147                  "%s mount process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
1148
1149         /* Note that mount(8) returning and the kernel sending us a
1150          * mount table change event might happen out-of-order. If an
1151          * operation succeed we assume the kernel will follow soon too
1152          * and already change into the resulting state.  If it fails
1153          * we check if the kernel still knows about the mount. and
1154          * change state accordingly. */
1155
1156         switch (m->state) {
1157
1158         case MOUNT_MOUNTING:
1159         case MOUNT_MOUNTING_DONE:
1160         case MOUNT_MOUNTING_SIGKILL:
1161         case MOUNT_MOUNTING_SIGTERM:
1162
1163                 if (success)
1164                         mount_enter_mounted(m, true);
1165                 else if (m->from_proc_self_mountinfo)
1166                         mount_enter_mounted(m, false);
1167                 else
1168                         mount_enter_dead(m, false);
1169                 break;
1170
1171         case MOUNT_REMOUNTING:
1172         case MOUNT_REMOUNTING_SIGKILL:
1173         case MOUNT_REMOUNTING_SIGTERM:
1174
1175                 m->reload_failure = !success;
1176                 if (m->from_proc_self_mountinfo)
1177                         mount_enter_mounted(m, true);
1178                 else
1179                         mount_enter_dead(m, true);
1180
1181                 break;
1182
1183         case MOUNT_UNMOUNTING:
1184         case MOUNT_UNMOUNTING_SIGKILL:
1185         case MOUNT_UNMOUNTING_SIGTERM:
1186
1187                 if (success)
1188                         mount_enter_dead(m, true);
1189                 else if (m->from_proc_self_mountinfo)
1190                         mount_enter_mounted(m, false);
1191                 else
1192                         mount_enter_dead(m, false);
1193                 break;
1194
1195         default:
1196                 assert_not_reached("Uh, control process died at wrong time.");
1197         }
1198
1199         /* Notify clients about changed exit status */
1200         unit_add_to_dbus_queue(u);
1201 }
1202
1203 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
1204         Mount *m = MOUNT(u);
1205
1206         assert(m);
1207         assert(elapsed == 1);
1208         assert(w == &m->timer_watch);
1209
1210         switch (m->state) {
1211
1212         case MOUNT_MOUNTING:
1213         case MOUNT_MOUNTING_DONE:
1214                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
1215                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
1216                 break;
1217
1218         case MOUNT_REMOUNTING:
1219                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
1220                 m->reload_failure = true;
1221                 mount_enter_mounted(m, true);
1222                 break;
1223
1224         case MOUNT_UNMOUNTING:
1225                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
1226                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
1227                 break;
1228
1229         case MOUNT_MOUNTING_SIGTERM:
1230                 if (m->exec_context.send_sigkill) {
1231                         log_warning("%s mounting timed out. Killing.", u->meta.id);
1232                         mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
1233                 } else {
1234                         log_warning("%s mounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1235
1236                         if (m->from_proc_self_mountinfo)
1237                                 mount_enter_mounted(m, false);
1238                         else
1239                                 mount_enter_dead(m, false);
1240                 }
1241                 break;
1242
1243         case MOUNT_REMOUNTING_SIGTERM:
1244                 if (m->exec_context.send_sigkill) {
1245                         log_warning("%s remounting timed out. Killing.", u->meta.id);
1246                         mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
1247                 } else {
1248                         log_warning("%s remounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1249
1250                         if (m->from_proc_self_mountinfo)
1251                                 mount_enter_mounted(m, false);
1252                         else
1253                                 mount_enter_dead(m, false);
1254                 }
1255                 break;
1256
1257         case MOUNT_UNMOUNTING_SIGTERM:
1258                 if (m->exec_context.send_sigkill) {
1259                         log_warning("%s unmounting timed out. Killing.", u->meta.id);
1260                         mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
1261                 } else {
1262                         log_warning("%s unmounting timed out. Skipping SIGKILL. Ignoring.", u->meta.id);
1263
1264                         if (m->from_proc_self_mountinfo)
1265                                 mount_enter_mounted(m, false);
1266                         else
1267                                 mount_enter_dead(m, false);
1268                 }
1269                 break;
1270
1271         case MOUNT_MOUNTING_SIGKILL:
1272         case MOUNT_REMOUNTING_SIGKILL:
1273         case MOUNT_UNMOUNTING_SIGKILL:
1274                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
1275
1276                 if (m->from_proc_self_mountinfo)
1277                         mount_enter_mounted(m, false);
1278                 else
1279                         mount_enter_dead(m, false);
1280                 break;
1281
1282         default:
1283                 assert_not_reached("Timeout at wrong time.");
1284         }
1285 }
1286
1287 static int mount_add_one(
1288                 Manager *m,
1289                 const char *what,
1290                 const char *where,
1291                 const char *options,
1292                 const char *fstype,
1293                 int passno,
1294                 bool from_proc_self_mountinfo,
1295                 bool set_flags) {
1296         int r;
1297         Unit *u;
1298         bool delete;
1299         char *e, *w = NULL, *o = NULL, *f = NULL;
1300         MountParameters *p;
1301
1302         assert(m);
1303         assert(what);
1304         assert(where);
1305         assert(options);
1306         assert(fstype);
1307
1308         assert(!set_flags || from_proc_self_mountinfo);
1309
1310         /* Ignore API mount points. They should never be referenced in
1311          * dependencies ever. */
1312         if (mount_point_is_api(where) || mount_point_ignore(where))
1313                 return 0;
1314
1315         if (streq(fstype, "autofs"))
1316                 return 0;
1317
1318         /* probably some kind of swap, ignore */
1319         if (!is_path(where))
1320                 return 0;
1321
1322         if (!(e = unit_name_from_path(where, ".mount")))
1323                 return -ENOMEM;
1324
1325         if (!(u = manager_get_unit(m, e))) {
1326                 delete = true;
1327
1328                 if (!(u = unit_new(m))) {
1329                         free(e);
1330                         return -ENOMEM;
1331                 }
1332
1333                 r = unit_add_name(u, e);
1334                 free(e);
1335
1336                 if (r < 0)
1337                         goto fail;
1338
1339                 if (!(MOUNT(u)->where = strdup(where))) {
1340                         r = -ENOMEM;
1341                         goto fail;
1342                 }
1343
1344                 unit_add_to_load_queue(u);
1345         } else {
1346                 delete = false;
1347                 free(e);
1348         }
1349
1350         if (!(w = strdup(what)) ||
1351             !(o = strdup(options)) ||
1352             !(f = strdup(fstype))) {
1353                 r = -ENOMEM;
1354                 goto fail;
1355         }
1356
1357         if (from_proc_self_mountinfo) {
1358                 p = &MOUNT(u)->parameters_proc_self_mountinfo;
1359
1360                 if (set_flags) {
1361                         MOUNT(u)->is_mounted = true;
1362                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
1363                         MOUNT(u)->just_changed = !streq_ptr(p->options, o);
1364                 }
1365
1366                 MOUNT(u)->from_proc_self_mountinfo = true;
1367         } else {
1368                 p = &MOUNT(u)->parameters_etc_fstab;
1369                 MOUNT(u)->from_etc_fstab = true;
1370         }
1371
1372         free(p->what);
1373         p->what = w;
1374
1375         free(p->options);
1376         p->options = o;
1377
1378         free(p->fstype);
1379         p->fstype = f;
1380
1381         p->passno = passno;
1382
1383         unit_add_to_dbus_queue(u);
1384
1385         return 0;
1386
1387 fail:
1388         free(w);
1389         free(o);
1390         free(f);
1391
1392         if (delete && u)
1393                 unit_free(u);
1394
1395         return r;
1396 }
1397
1398 static int mount_find_pri(char *options) {
1399         char *end, *pri;
1400         unsigned long r;
1401
1402         if (!(pri = mount_test_option(options, "pri=")))
1403                 return 0;
1404
1405         pri += 4;
1406
1407         errno = 0;
1408         r = strtoul(pri, &end, 10);
1409
1410         if (errno != 0)
1411                 return -errno;
1412
1413         if (end == pri || (*end != ',' && *end != 0))
1414                 return -EINVAL;
1415
1416         return (int) r;
1417 }
1418
1419 static int mount_load_etc_fstab(Manager *m) {
1420         FILE *f;
1421         int r = 0;
1422         struct mntent* me;
1423
1424         assert(m);
1425
1426         errno = 0;
1427         if (!(f = setmntent("/etc/fstab", "r")))
1428                 return -errno;
1429
1430         while ((me = getmntent(f))) {
1431                 char *where, *what;
1432                 int k;
1433
1434                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1435                         r = -ENOMEM;
1436                         goto finish;
1437                 }
1438
1439                 if (!(where = strdup(me->mnt_dir))) {
1440                         free(what);
1441                         r = -ENOMEM;
1442                         goto finish;
1443                 }
1444
1445                 if (what[0] == '/')
1446                         path_kill_slashes(what);
1447
1448                 if (where[0] == '/')
1449                         path_kill_slashes(where);
1450
1451                 if (streq(me->mnt_type, "swap")) {
1452                         int pri;
1453
1454                         if ((pri = mount_find_pri(me->mnt_opts)) < 0)
1455                                 k = pri;
1456                         else
1457                                 k = swap_add_one(m,
1458                                                  what,
1459                                                  NULL,
1460                                                  pri,
1461                                                  !!mount_test_option(me->mnt_opts, MNTOPT_NOAUTO),
1462                                                  !!mount_test_option(me->mnt_opts, "nofail"),
1463                                                  !!mount_test_option(me->mnt_opts, "comment=systemd.swapon"),
1464                                                  false);
1465                 } else
1466                         k = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, me->mnt_passno, false, false);
1467
1468                 free(what);
1469                 free(where);
1470
1471                 if (r < 0)
1472                         r = k;
1473         }
1474
1475 finish:
1476
1477         endmntent(f);
1478         return r;
1479 }
1480
1481 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1482         int r = 0;
1483         unsigned i;
1484         char *device, *path, *options, *options2, *fstype, *d, *p, *o;
1485
1486         assert(m);
1487
1488         rewind(m->proc_self_mountinfo);
1489
1490         for (i = 1;; i++) {
1491                 int k;
1492
1493                 device = path = options = options2 = fstype = d = p = o = NULL;
1494
1495                 if ((k = fscanf(m->proc_self_mountinfo,
1496                                 "%*s "       /* (1) mount id */
1497                                 "%*s "       /* (2) parent id */
1498                                 "%*s "       /* (3) major:minor */
1499                                 "%*s "       /* (4) root */
1500                                 "%ms "       /* (5) mount point */
1501                                 "%ms"        /* (6) mount options */
1502                                 "%*[^-]"     /* (7) optional fields */
1503                                 "- "         /* (8) separator */
1504                                 "%ms "       /* (9) file system type */
1505                                 "%ms"        /* (10) mount source */
1506                                 "%ms"        /* (11) mount options 2 */
1507                                 "%*[^\n]",   /* some rubbish at the end */
1508                                 &path,
1509                                 &options,
1510                                 &fstype,
1511                                 &device,
1512                                 &options2)) != 5) {
1513
1514                         if (k == EOF)
1515                                 break;
1516
1517                         log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
1518                         goto clean_up;
1519                 }
1520
1521                 if (asprintf(&o, "%s,%s", options, options2) < 0) {
1522                         r = -ENOMEM;
1523                         goto finish;
1524                 }
1525
1526                 if (!(d = cunescape(device)) ||
1527                     !(p = cunescape(path))) {
1528                         r = -ENOMEM;
1529                         goto finish;
1530                 }
1531
1532                 if ((k = mount_add_one(m, d, p, o, fstype, 0, true, set_flags)) < 0)
1533                         r = k;
1534
1535 clean_up:
1536                 free(device);
1537                 free(path);
1538                 free(options);
1539                 free(options2);
1540                 free(fstype);
1541                 free(d);
1542                 free(p);
1543                 free(o);
1544         }
1545
1546 finish:
1547         free(device);
1548         free(path);
1549         free(options);
1550         free(options2);
1551         free(fstype);
1552         free(d);
1553         free(p);
1554         free(o);
1555
1556         return r;
1557 }
1558
1559 static void mount_shutdown(Manager *m) {
1560         assert(m);
1561
1562         if (m->proc_self_mountinfo) {
1563                 fclose(m->proc_self_mountinfo);
1564                 m->proc_self_mountinfo = NULL;
1565         }
1566 }
1567
1568 static int mount_enumerate(Manager *m) {
1569         int r;
1570         struct epoll_event ev;
1571         assert(m);
1572
1573         if (!m->proc_self_mountinfo) {
1574                 if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
1575                         return -errno;
1576
1577                 m->mount_watch.type = WATCH_MOUNT;
1578                 m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1579
1580                 zero(ev);
1581                 ev.events = EPOLLPRI;
1582                 ev.data.ptr = &m->mount_watch;
1583
1584                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1585                         return -errno;
1586         }
1587
1588         if ((r = mount_load_etc_fstab(m)) < 0)
1589                 goto fail;
1590
1591         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1592                 goto fail;
1593
1594         return 0;
1595
1596 fail:
1597         mount_shutdown(m);
1598         return r;
1599 }
1600
1601 void mount_fd_event(Manager *m, int events) {
1602         Meta *meta;
1603         int r;
1604
1605         assert(m);
1606         assert(events & EPOLLPRI);
1607
1608         /* The manager calls this for every fd event happening on the
1609          * /proc/self/mountinfo file, which informs us about mounting
1610          * table changes */
1611
1612         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1613                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-r));
1614
1615                 /* Reset flags, just in case, for later calls */
1616                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1617                         Mount *mount = (Mount*) meta;
1618
1619                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1620                 }
1621
1622                 return;
1623         }
1624
1625         manager_dispatch_load_queue(m);
1626
1627         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1628                 Mount *mount = (Mount*) meta;
1629
1630                 if (!mount->is_mounted) {
1631                         /* This has just been unmounted. */
1632
1633                         mount->from_proc_self_mountinfo = false;
1634
1635                         switch (mount->state) {
1636
1637                         case MOUNT_MOUNTED:
1638                                 mount_enter_dead(mount, true);
1639                                 break;
1640
1641                         default:
1642                                 mount_set_state(mount, mount->state);
1643                                 break;
1644
1645                         }
1646
1647                 } else if (mount->just_mounted || mount->just_changed) {
1648
1649                         /* New or changed mount entry */
1650
1651                         switch (mount->state) {
1652
1653                         case MOUNT_DEAD:
1654                         case MOUNT_FAILED:
1655                                 mount_enter_mounted(mount, true);
1656                                 break;
1657
1658                         case MOUNT_MOUNTING:
1659                                 mount_enter_mounting_done(mount);
1660                                 break;
1661
1662                         default:
1663                                 /* Nothing really changed, but let's
1664                                  * issue an notification call
1665                                  * nonetheless, in case somebody is
1666                                  * waiting for this. (e.g. file system
1667                                  * ro/rw remounts.) */
1668                                 mount_set_state(mount, mount->state);
1669                                 break;
1670                         }
1671                 }
1672
1673                 /* Reset the flags for later calls */
1674                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1675         }
1676 }
1677
1678 static void mount_reset_failed(Unit *u) {
1679         Mount *m = MOUNT(u);
1680
1681         assert(m);
1682
1683         if (m->state == MOUNT_FAILED)
1684                 mount_set_state(m, MOUNT_DEAD);
1685
1686         m->failure = false;
1687 }
1688
1689 static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError *error) {
1690         Mount *m = MOUNT(u);
1691         int r = 0;
1692         Set *pid_set = NULL;
1693
1694         assert(m);
1695
1696         if (who == KILL_MAIN) {
1697                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "Mount units have no main processes");
1698                 return -EINVAL;
1699         }
1700
1701         if (m->control_pid <= 0 && who == KILL_CONTROL) {
1702                 dbus_set_error(error, BUS_ERROR_NO_SUCH_PROCESS, "No control process to kill");
1703                 return -ENOENT;
1704         }
1705
1706         if (m->control_pid > 0)
1707                 if (kill(m->control_pid, signo) < 0)
1708                         r = -errno;
1709
1710         if (mode == KILL_CONTROL_GROUP) {
1711                 int q;
1712
1713                 if (!(pid_set = set_new(trivial_hash_func, trivial_compare_func)))
1714                         return -ENOMEM;
1715
1716                 /* Exclude the control pid from being killed via the cgroup */
1717                 if (m->control_pid > 0)
1718                         if ((q = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0) {
1719                                 r = q;
1720                                 goto finish;
1721                         }
1722
1723                 if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0)
1724                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
1725                                 r = q;
1726         }
1727
1728 finish:
1729         if (pid_set)
1730                 set_free(pid_set);
1731
1732         return r;
1733 }
1734
1735 static const char* const mount_state_table[_MOUNT_STATE_MAX] = {
1736         [MOUNT_DEAD] = "dead",
1737         [MOUNT_MOUNTING] = "mounting",
1738         [MOUNT_MOUNTING_DONE] = "mounting-done",
1739         [MOUNT_MOUNTED] = "mounted",
1740         [MOUNT_REMOUNTING] = "remounting",
1741         [MOUNT_UNMOUNTING] = "unmounting",
1742         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
1743         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
1744         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
1745         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
1746         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
1747         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
1748         [MOUNT_FAILED] = "failed"
1749 };
1750
1751 DEFINE_STRING_TABLE_LOOKUP(mount_state, MountState);
1752
1753 static const char* const mount_exec_command_table[_MOUNT_EXEC_COMMAND_MAX] = {
1754         [MOUNT_EXEC_MOUNT] = "ExecMount",
1755         [MOUNT_EXEC_UNMOUNT] = "ExecUnmount",
1756         [MOUNT_EXEC_REMOUNT] = "ExecRemount",
1757 };
1758
1759 DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
1760
1761 const UnitVTable mount_vtable = {
1762         .suffix = ".mount",
1763
1764         .no_alias = true,
1765         .no_instances = true,
1766         .no_isolate = true,
1767         .show_status = true,
1768
1769         .init = mount_init,
1770         .load = mount_load,
1771         .done = mount_done,
1772
1773         .coldplug = mount_coldplug,
1774
1775         .dump = mount_dump,
1776
1777         .start = mount_start,
1778         .stop = mount_stop,
1779         .reload = mount_reload,
1780
1781         .kill = mount_kill,
1782
1783         .serialize = mount_serialize,
1784         .deserialize_item = mount_deserialize_item,
1785
1786         .active_state = mount_active_state,
1787         .sub_state_to_string = mount_sub_state_to_string,
1788
1789         .check_gc = mount_check_gc,
1790
1791         .sigchld_event = mount_sigchld_event,
1792         .timer_event = mount_timer_event,
1793
1794         .reset_failed = mount_reset_failed,
1795
1796         .bus_interface = "org.freedesktop.systemd1.Mount",
1797         .bus_message_handler = bus_mount_message_handler,
1798         .bus_invalidating_properties =  bus_mount_invalidating_properties,
1799
1800         .enumerate = mount_enumerate,
1801         .shutdown = mount_shutdown
1802 };