mount.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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 "mount.h"
  37 #include "dbus-mount.h"
  38
  39 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  40         [MOUNT_DEAD] = UNIT_INACTIVE,
  41         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  42         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  43         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  44         [MOUNT_REMOUNTING] = UNIT_ACTIVE_RELOADING,
  45         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  46         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  47         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  48         [MOUNT_REMOUNTING_SIGTERM] = UNIT_ACTIVE_RELOADING,
  49         [MOUNT_REMOUNTING_SIGKILL] = UNIT_ACTIVE_RELOADING,
  50         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  51         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  52         [MOUNT_MAINTAINANCE] = UNIT_INACTIVE,
  53 };
  54
  55 static const char* const state_string_table[_MOUNT_STATE_MAX] = {
  56         [MOUNT_DEAD] = "dead",
  57         [MOUNT_MOUNTING] = "mounting",
  58         [MOUNT_MOUNTING_DONE] = "mounting-done",
  59         [MOUNT_MOUNTED] = "mounted",
  60         [MOUNT_REMOUNTING] = "remounting",
  61         [MOUNT_UNMOUNTING] = "unmounting",
  62         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
  63         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
  64         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
  65         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
  66         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
  67         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
  68         [MOUNT_MAINTAINANCE] = "maintainance"
  69 };
  70
  71 static char *mount_name_from_where(const char *where) {
  72         assert(where);
  73
  74         if (streq(where, "/"))
  75                 return strdup("-.mount");
  76
  77         return unit_name_build_escape(where+1, NULL, ".mount");
  78 }
  79
  80 static void service_unwatch_control_pid(Mount *m) {
  81         assert(m);
  82
  83         if (m->control_pid <= 0)
  84                 return;
  85
  86         unit_unwatch_pid(UNIT(m), m->control_pid);
  87         m->control_pid = 0;
  88 }
  89
  90 static void mount_parameters_done(MountParameters *p) {
  91         assert(p);
  92
  93         free(p->what);
  94         free(p->options);
  95         free(p->fstype);
  96
  97         p->what = p->options = p->fstype = NULL;
  98 }
  99
 100 static void mount_done(Unit *u) {
 101         Mount *m = MOUNT(u);
 102
 103         assert(m);
 104
 105         free(m->where);
 106         m->where = NULL;
 107
 108         mount_parameters_done(&m->parameters_etc_fstab);
 109         mount_parameters_done(&m->parameters_proc_self_mountinfo);
 110         mount_parameters_done(&m->parameters_fragment);
 111
 112         exec_context_done(&m->exec_context);
 113         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 114         m->control_command = NULL;
 115
 116         service_unwatch_control_pid(m);
 117
 118         unit_unwatch_timer(u, &m->timer_watch);
 119 }
 120
 121 static void mount_init(Unit *u) {
 122         Mount *m = MOUNT(u);
 123
 124         assert(u);
 125         assert(u->meta.load_state == UNIT_STUB);
 126
 127         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
 128         exec_context_init(&m->exec_context);
 129
 130         /* We need to make sure that /bin/mount is always called in
 131          * the same process group as us, so that the autofs kernel
 132          * side doesn't send us another mount request while we are
 133          * already trying to comply its last one. */
 134         m->exec_context.no_setsid = true;
 135
 136         m->timer_watch.type = WATCH_INVALID;
 137 }
 138
 139 static int mount_notify_automount(Mount *m, int status) {
 140         Unit *p;
 141         char *k;
 142
 143         assert(m);
 144
 145         if (!(k = unit_name_change_suffix(UNIT(m)->meta.id, ".automount")))
 146                 return -ENOMEM;
 147
 148         p = manager_get_unit(UNIT(m)->meta.manager, k);
 149         free(k);
 150
 151         if (!p)
 152                 return 0;
 153
 154         return automount_send_ready(AUTOMOUNT(p), status);
 155 }
 156
 157 static int mount_add_node_links(Mount *m) {
 158         Unit *device;
 159         char *e;
 160         int r;
 161         const char *what;
 162
 163         assert(m);
 164
 165         /* Adds in links to the device that this node is based on */
 166
 167         if (m->parameters_fragment.what)
 168                 what = m->parameters_fragment.what;
 169         else if (m->parameters_etc_fstab.what)
 170                 what = m->parameters_etc_fstab.what;
 171         else
 172                 /* We observe kernel mounts only while they are live,
 173                  * hence don't create any links for them */
 174                 return 0;
 175
 176         if (!path_startswith(what, "/dev/"))
 177                 return 0;
 178
 179         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
 180                 return -ENOMEM;
 181
 182         r = manager_load_unit(UNIT(m)->meta.manager, e, NULL, &device);
 183         free(e);
 184
 185         if (r < 0)
 186                 return r;
 187
 188         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
 189                 return r;
 190
 191         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
 192                 return r;
 193
 194         if (UNIT(m)->meta.manager->running_as == MANAGER_INIT ||
 195             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)
 196                 if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
 197                         return r;
 198
 199         return 0;
 200 }
 201
 202 static int mount_add_path_links(Mount *m) {
 203         Meta *other;
 204         int r;
 205
 206         assert(m);
 207
 208         /* Adds in link to other mount points, that might lie below or
 209          * above us in the hierarchy */
 210
 211         LIST_FOREACH(units_per_type, other, UNIT(m)->meta.manager->units_per_type[UNIT_MOUNT]) {
 212                 Mount *n;
 213
 214                 n = (Mount*) other;
 215
 216                 if (n == m)
 217                         continue;
 218
 219                 if (m->meta.load_state != UNIT_LOADED)
 220                         continue;
 221
 222                 if (path_startswith(m->where, n->where)) {
 223
 224                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(other))) < 0)
 225                                 return r;
 226
 227                         if (n->from_etc_fstab || n->from_fragment)
 228                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(other))) < 0)
 229                                         return r;
 230
 231                 } else if (path_startswith(n->where, m->where)) {
 232
 233                         if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(other))) < 0)
 234                                 return r;
 235
 236                         if (m->from_etc_fstab || m->from_fragment)
 237                                 if ((r = unit_add_dependency(UNIT(other), UNIT_REQUIRES, UNIT(m))) < 0)
 238                                         return r;
 239                 }
 240         }
 241
 242         return 0;
 243 }
 244
 245 static bool mount_test_option(const char *haystack, const char *needle) {
 246         struct mntent me;
 247
 248         assert(needle);
 249
 250         /* Like glibc's hasmntopt(), but works on a string, not a
 251          * struct mntent */
 252
 253         if (!haystack)
 254                 return false;
 255
 256         zero(me);
 257         me.mnt_opts = (char*) haystack;
 258
 259         return !!hasmntopt(&me, needle);
 260 }
 261
 262 static int mount_add_target_links(Mount *m) {
 263         const char *target;
 264         MountParameters *p;
 265         Unit *u;
 266         int r;
 267         bool noauto;
 268         bool handle;
 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         handle = mount_test_option(p->options, "comment=systemd.mount");
 281
 282         if (noauto && !handle)
 283                 return 0;
 284
 285         if (mount_test_option(p->options, "_netdev") ||
 286             fstype_is_network(p->fstype))
 287                 target = SPECIAL_REMOTE_FS_TARGET;
 288         else
 289                 target = SPECIAL_LOCAL_FS_TARGET;
 290
 291         if ((r = manager_load_unit(UNIT(m)->meta.manager, target, NULL, &u)) < 0)
 292                 return r;
 293
 294         if (handle)
 295                 if ((r = unit_add_dependency(u, UNIT_WANTS, UNIT(m))) < 0)
 296                         return r;
 297
 298         return unit_add_dependency(UNIT(m), UNIT_BEFORE, u);
 299 }
 300
 301 static int mount_verify(Mount *m) {
 302         bool b;
 303         char *e;
 304         assert(m);
 305
 306         if (UNIT(m)->meta.load_state != UNIT_LOADED)
 307                 return 0;
 308
 309         if (!m->where) {
 310                 log_error("%s lacks Where setting. Refusing.", UNIT(m)->meta.id);
 311                 return -EINVAL;
 312         }
 313
 314         path_kill_slashes(m->where);
 315
 316         if (!(e = mount_name_from_where(m->where)))
 317                 return -ENOMEM;
 318
 319         b = unit_has_name(UNIT(m), e);
 320         free(e);
 321
 322         if (!b) {
 323                 log_error("%s's Where setting doesn't match unit name. Refusing.", UNIT(m)->meta.id);
 324                 return -EINVAL;
 325         }
 326
 327         return 0;
 328 }
 329
 330 static int mount_load(Unit *u) {
 331         Mount *m = MOUNT(u);
 332         int r;
 333
 334         assert(u);
 335         assert(u->meta.load_state == UNIT_STUB);
 336
 337         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 338                 return r;
 339
 340         /* This is a new unit? Then let's add in some extras */
 341         if (u->meta.load_state == UNIT_LOADED) {
 342
 343                 /* Minor validity checking */
 344                 if ((m->parameters_fragment.options || m->parameters_fragment.fstype) && !m->parameters_fragment.what)
 345                         return -EBADMSG;
 346
 347                 if (m->parameters_fragment.what)
 348                         m->from_fragment = true;
 349
 350                 if ((r = mount_add_node_links(MOUNT(u))) < 0)
 351                         return r;
 352
 353                 if ((r = mount_add_path_links(MOUNT(u))) < 0)
 354                         return r;
 355
 356                 if ((r = mount_add_target_links(MOUNT(u))) < 0)
 357                         return r;
 358
 359                 if ((r = unit_add_default_cgroup(u)) < 0)
 360                         return r;
 361         }
 362
 363         return mount_verify(m);
 364 }
 365
 366 static void mount_set_state(Mount *m, MountState state) {
 367         MountState old_state;
 368         assert(m);
 369
 370         old_state = m->state;
 371         m->state = state;
 372
 373         if (state != MOUNT_MOUNTING &&
 374             state != MOUNT_MOUNTING_DONE &&
 375             state != MOUNT_REMOUNTING &&
 376             state != MOUNT_UNMOUNTING &&
 377             state != MOUNT_MOUNTING_SIGTERM &&
 378             state != MOUNT_MOUNTING_SIGKILL &&
 379             state != MOUNT_UNMOUNTING_SIGTERM &&
 380             state != MOUNT_UNMOUNTING_SIGKILL &&
 381             state != MOUNT_REMOUNTING_SIGTERM &&
 382             state != MOUNT_REMOUNTING_SIGKILL) {
 383                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 384                 service_unwatch_control_pid(m);
 385                 m->control_command = NULL;
 386         }
 387
 388         if (state == MOUNT_MOUNTED ||
 389             state == MOUNT_REMOUNTING)
 390                 mount_notify_automount(m, 0);
 391         else if (state == MOUNT_DEAD ||
 392                  state == MOUNT_UNMOUNTING ||
 393                  state == MOUNT_MOUNTING_SIGTERM ||
 394                  state == MOUNT_MOUNTING_SIGKILL ||
 395                  state == MOUNT_REMOUNTING_SIGTERM ||
 396                  state == MOUNT_REMOUNTING_SIGKILL ||
 397                  state == MOUNT_UNMOUNTING_SIGTERM ||
 398                  state == MOUNT_UNMOUNTING_SIGKILL ||
 399                  state == MOUNT_MAINTAINANCE)
 400                 mount_notify_automount(m, -ENODEV);
 401
 402         if (state != old_state)
 403                 log_debug("%s changed %s → %s", UNIT(m)->meta.id, state_string_table[old_state], state_string_table[state]);
 404
 405         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 406 }
 407
 408 static int mount_coldplug(Unit *u) {
 409         Mount *m = MOUNT(u);
 410
 411         assert(m);
 412         assert(m->state == MOUNT_DEAD);
 413
 414         if (m->from_proc_self_mountinfo)
 415                 mount_set_state(m, MOUNT_MOUNTED);
 416
 417         return 0;
 418 }
 419
 420 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 421         pid_t pid;
 422         int r;
 423
 424         assert(m);
 425         assert(c);
 426         assert(_pid);
 427
 428         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 429                 goto fail;
 430
 431         if ((r = exec_spawn(c,
 432                             NULL,
 433                             &m->exec_context,
 434                             NULL, 0,
 435                             true,
 436                             true,
 437                             UNIT(m)->meta.manager->confirm_spawn,
 438                             UNIT(m)->meta.cgroup_bondings,
 439                             &pid)) < 0)
 440                 goto fail;
 441
 442         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 443                 /* FIXME: we need to do something here */
 444                 goto fail;
 445
 446         *_pid = pid;
 447
 448         return 0;
 449
 450 fail:
 451         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 452
 453         return r;
 454 }
 455
 456 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 457         Mount *m = MOUNT(u);
 458         MountParameters *p;
 459
 460         assert(m);
 461         assert(f);
 462
 463         if (m->from_proc_self_mountinfo)
 464                 p = &m->parameters_proc_self_mountinfo;
 465         else if (m->from_fragment)
 466                 p = &m->parameters_fragment;
 467         else
 468                 p = &m->parameters_etc_fstab;
 469
 470         fprintf(f,
 471                 "%sMount State: %s\n"
 472                 "%sWhere: %s\n"
 473                 "%sWhat: %s\n"
 474                 "%sFile System Type: %s\n"
 475                 "%sOptions: %s\n"
 476                 "%sFrom /etc/fstab: %s\n"
 477                 "%sFrom /proc/self/mountinfo: %s\n"
 478                 "%sFrom fragment: %s\n"
 479                 "%sKillMode: %s\n",
 480                 prefix, state_string_table[m->state],
 481                 prefix, m->where,
 482                 prefix, strna(p->what),
 483                 prefix, strna(p->fstype),
 484                 prefix, strna(p->options),
 485                 prefix, yes_no(m->from_etc_fstab),
 486                 prefix, yes_no(m->from_proc_self_mountinfo),
 487                 prefix, yes_no(m->from_fragment),
 488                 prefix, kill_mode_to_string(m->kill_mode));
 489
 490         if (m->control_pid > 0)
 491                 fprintf(f,
 492                         "%sControl PID: %llu\n",
 493                         prefix, (unsigned long long) m->control_pid);
 494
 495         exec_context_dump(&m->exec_context, f, prefix);
 496 }
 497
 498 static void mount_enter_dead(Mount *m, bool success) {
 499         assert(m);
 500
 501         if (!success)
 502                 m->failure = true;
 503
 504         mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD);
 505 }
 506
 507 static void mount_enter_mounted(Mount *m, bool success) {
 508         assert(m);
 509
 510         if (!success)
 511                 m->failure = true;
 512
 513         mount_set_state(m, MOUNT_MOUNTED);
 514 }
 515
 516 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 517         int r;
 518         bool sent = false;
 519
 520         assert(m);
 521
 522         if (!success)
 523                 m->failure = true;
 524
 525         if (m->kill_mode != KILL_NONE) {
 526                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 527                            state == MOUNT_UNMOUNTING_SIGTERM ||
 528                            state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
 529
 530                 if (m->kill_mode == KILL_CONTROL_GROUP) {
 531
 532                         if ((r = cgroup_bonding_kill_list(UNIT(m)->meta.cgroup_bondings, sig)) < 0) {
 533                                 if (r != -EAGAIN && r != -ESRCH)
 534                                         goto fail;
 535                         } else
 536                                 sent = true;
 537                 }
 538
 539                 if (!sent && m->control_pid > 0)
 540                         if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) {
 541                                 r = -errno;
 542                                 goto fail;
 543                         }
 544         }
 545
 546         if (sent) {
 547                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 548                         goto fail;
 549
 550                 mount_set_state(m, state);
 551         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 552                 mount_enter_mounted(m, true);
 553         else
 554                 mount_enter_dead(m, true);
 555
 556         return;
 557
 558 fail:
 559         log_warning("%s failed to kill processes: %s", UNIT(m)->meta.id, strerror(-r));
 560
 561         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 562                 mount_enter_mounted(m, false);
 563         else
 564                 mount_enter_dead(m, false);
 565 }
 566
 567 static void mount_enter_unmounting(Mount *m, bool success) {
 568         ExecCommand *c;
 569         int r;
 570
 571         assert(m);
 572
 573         if (!success)
 574                 m->failure = true;
 575
 576         m->control_command = c = m->exec_command + MOUNT_EXEC_UNMOUNT;
 577
 578         if ((r = exec_command_set(
 579                              c,
 580                              "/bin/umount",
 581                              m->where,
 582                              NULL)) < 0)
 583                 goto fail;
 584
 585         service_unwatch_control_pid(m);
 586
 587         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 588                 goto fail;
 589
 590         mount_set_state(m, MOUNT_UNMOUNTING);
 591
 592         return;
 593
 594 fail:
 595         log_warning("%s failed to run umount exectuable: %s", UNIT(m)->meta.id, strerror(-r));
 596         mount_enter_mounted(m, false);
 597 }
 598
 599 static void mount_enter_mounting(Mount *m) {
 600         ExecCommand *c;
 601         int r;
 602
 603         assert(m);
 604
 605         m->control_command = c = m->exec_command + MOUNT_EXEC_MOUNT;
 606
 607         if (m->from_fragment)
 608                 r = exec_command_set(
 609                                 c,
 610                                 "/bin/mount",
 611                                 m->parameters_fragment.what,
 612                                 m->where,
 613                                 "-t", m->parameters_fragment.fstype,
 614                                 m->parameters_fragment.options ? "-o" : NULL, m->parameters_fragment.options,
 615                                 NULL);
 616         else if (m->from_etc_fstab)
 617                 r = exec_command_set(
 618                                 c,
 619                                 "/bin/mount",
 620                                 m->where,
 621                                 NULL);
 622         else
 623                 r = -ENOENT;
 624
 625         if (r < 0)
 626                 goto fail;
 627
 628         service_unwatch_control_pid(m);
 629
 630         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 631                 goto fail;
 632
 633         mount_set_state(m, MOUNT_MOUNTING);
 634
 635         return;
 636
 637 fail:
 638         log_warning("%s failed to run mount exectuable: %s", UNIT(m)->meta.id, strerror(-r));
 639         mount_enter_dead(m, false);
 640 }
 641
 642 static void mount_enter_mounting_done(Mount *m) {
 643         assert(m);
 644
 645         mount_set_state(m, MOUNT_MOUNTING_DONE);
 646 }
 647
 648 static void mount_enter_remounting(Mount *m, bool success) {
 649         ExecCommand *c;
 650         int r;
 651
 652         assert(m);
 653
 654         if (!success)
 655                 m->failure = true;
 656
 657         m->control_command = c = m->exec_command + MOUNT_EXEC_REMOUNT;
 658
 659         if (m->from_fragment) {
 660                 char *buf = NULL;
 661                 const char *o;
 662
 663                 if (m->parameters_fragment.options) {
 664                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 665                                 r = -ENOMEM;
 666                                 goto fail;
 667                         }
 668
 669                         o = buf;
 670                 } else
 671                         o = "remount";
 672
 673                 r = exec_command_set(
 674                                 c,
 675                                 "/bin/mount",
 676                                 m->parameters_fragment.what,
 677                                 m->where,
 678                                 "-t", m->parameters_fragment.fstype,
 679                                 "-o", o,
 680                                 NULL);
 681
 682                 free(buf);
 683         } else if (m->from_etc_fstab)
 684                 r = exec_command_set(
 685                                 c,
 686                                 "/bin/mount",
 687                                 m->where,
 688                                 "-o", "remount",
 689                                 NULL);
 690         else
 691                 r = -ENOENT;
 692
 693         if (r < 0) {
 694                 r = -ENOMEM;
 695                 goto fail;
 696         }
 697
 698         service_unwatch_control_pid(m);
 699
 700         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 701                 goto fail;
 702
 703         mount_set_state(m, MOUNT_REMOUNTING);
 704
 705         return;
 706
 707 fail:
 708         mount_enter_mounted(m, false);
 709 }
 710
 711 static int mount_start(Unit *u) {
 712         Mount *m = MOUNT(u);
 713
 714         assert(m);
 715
 716         /* We cannot fulfill this request right now, try again later
 717          * please! */
 718         if (m->state == MOUNT_UNMOUNTING ||
 719             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 720             m->state == MOUNT_UNMOUNTING_SIGKILL)
 721                 return -EAGAIN;
 722
 723         /* Already on it! */
 724         if (m->state == MOUNT_MOUNTING ||
 725             m->state == MOUNT_MOUNTING_SIGTERM ||
 726             m->state == MOUNT_MOUNTING_SIGKILL)
 727                 return 0;
 728
 729         assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTAINANCE);
 730
 731         m->failure = false;
 732
 733         mount_enter_mounting(m);
 734         return 0;
 735 }
 736
 737 static int mount_stop(Unit *u) {
 738         Mount *m = MOUNT(u);
 739
 740         assert(m);
 741
 742         /* Cann't do this right now. */
 743         if (m->state == MOUNT_MOUNTING ||
 744             m->state == MOUNT_MOUNTING_DONE ||
 745             m->state == MOUNT_MOUNTING_SIGTERM ||
 746             m->state == MOUNT_MOUNTING_SIGKILL ||
 747             m->state == MOUNT_REMOUNTING ||
 748             m->state == MOUNT_REMOUNTING_SIGTERM ||
 749             m->state == MOUNT_REMOUNTING_SIGKILL)
 750                 return -EAGAIN;
 751
 752         /* Already on it */
 753         if (m->state == MOUNT_UNMOUNTING ||
 754             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 755             m->state == MOUNT_UNMOUNTING_SIGTERM)
 756                 return 0;
 757
 758         assert(m->state == MOUNT_MOUNTED);
 759
 760         mount_enter_unmounting(m, true);
 761         return 0;
 762 }
 763
 764 static int mount_reload(Unit *u) {
 765         Mount *m = MOUNT(u);
 766
 767         assert(m);
 768
 769         if (m->state == MOUNT_MOUNTING_DONE)
 770                 return -EAGAIN;
 771
 772         assert(m->state == MOUNT_MOUNTED);
 773
 774         mount_enter_remounting(m, true);
 775         return 0;
 776 }
 777
 778 static UnitActiveState mount_active_state(Unit *u) {
 779         assert(u);
 780
 781         return state_translation_table[MOUNT(u)->state];
 782 }
 783
 784 static const char *mount_sub_state_to_string(Unit *u) {
 785         assert(u);
 786
 787         return state_string_table[MOUNT(u)->state];
 788 }
 789
 790 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 791         Mount *m = MOUNT(u);
 792         bool success;
 793
 794         assert(m);
 795         assert(pid >= 0);
 796
 797         success = code == CLD_EXITED && status == 0;
 798         m->failure = m->failure || !success;
 799
 800         assert(m->control_pid == pid);
 801         assert(m->control_command);
 802
 803         exec_status_fill(&m->control_command->exec_status, pid, code, status);
 804         m->control_pid = 0;
 805
 806         log_debug("%s control process exited, code=%s status=%i", u->meta.id, sigchld_code_to_string(code), status);
 807
 808         /* Note that mount(8) returning and the kernel sending us a
 809          * mount table change event might happen out-of-order. If an
 810          * operation succeed we assume the kernel will follow soon too
 811          * and already change into the resulting state.  If it fails
 812          * we check if the kernel still knows about the mount. and
 813          * change state accordingly. */
 814
 815         switch (m->state) {
 816
 817         case MOUNT_MOUNTING:
 818         case MOUNT_MOUNTING_DONE:
 819         case MOUNT_MOUNTING_SIGKILL:
 820         case MOUNT_MOUNTING_SIGTERM:
 821         case MOUNT_REMOUNTING:
 822         case MOUNT_REMOUNTING_SIGKILL:
 823         case MOUNT_REMOUNTING_SIGTERM:
 824
 825                 if (success && m->from_proc_self_mountinfo)
 826                         mount_enter_mounted(m, true);
 827                 else if (m->from_proc_self_mountinfo)
 828                         mount_enter_mounted(m, false);
 829                 else
 830                         mount_enter_dead(m, false);
 831                 break;
 832
 833         case MOUNT_UNMOUNTING:
 834         case MOUNT_UNMOUNTING_SIGKILL:
 835         case MOUNT_UNMOUNTING_SIGTERM:
 836
 837                 if (success)
 838                         mount_enter_dead(m, true);
 839                 else if (m->from_proc_self_mountinfo)
 840                         mount_enter_mounted(m, false);
 841                 else
 842                         mount_enter_dead(m, false);
 843                 break;
 844
 845         default:
 846                 assert_not_reached("Uh, control process died at wrong time.");
 847         }
 848 }
 849
 850 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 851         Mount *m = MOUNT(u);
 852
 853         assert(m);
 854         assert(elapsed == 1);
 855         assert(w == &m->timer_watch);
 856
 857         switch (m->state) {
 858
 859         case MOUNT_MOUNTING:
 860         case MOUNT_MOUNTING_DONE:
 861                 log_warning("%s mounting timed out. Stopping.", u->meta.id);
 862                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
 863                 break;
 864
 865         case MOUNT_REMOUNTING:
 866                 log_warning("%s remounting timed out. Stopping.", u->meta.id);
 867                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
 868                 break;
 869
 870         case MOUNT_UNMOUNTING:
 871                 log_warning("%s unmounting timed out. Stopping.", u->meta.id);
 872                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
 873                 break;
 874
 875         case MOUNT_MOUNTING_SIGTERM:
 876                 log_warning("%s mounting timed out. Killing.", u->meta.id);
 877                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
 878                 break;
 879
 880         case MOUNT_REMOUNTING_SIGTERM:
 881                 log_warning("%s remounting timed out. Killing.", u->meta.id);
 882                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
 883                 break;
 884
 885         case MOUNT_UNMOUNTING_SIGTERM:
 886                 log_warning("%s unmounting timed out. Killing.", u->meta.id);
 887                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
 888                 break;
 889
 890         case MOUNT_MOUNTING_SIGKILL:
 891         case MOUNT_REMOUNTING_SIGKILL:
 892         case MOUNT_UNMOUNTING_SIGKILL:
 893                 log_warning("%s mount process still around after SIGKILL. Ignoring.", u->meta.id);
 894
 895                 if (m->from_proc_self_mountinfo)
 896                         mount_enter_mounted(m, false);
 897                 else
 898                         mount_enter_dead(m, false);
 899                 break;
 900
 901         default:
 902                 assert_not_reached("Timeout at wrong time.");
 903         }
 904 }
 905
 906 static int mount_add_one(
 907                 Manager *m,
 908                 const char *what,
 909                 const char *where,
 910                 const char *options,
 911                 const char *fstype,
 912                 bool from_proc_self_mountinfo,
 913                 bool set_flags) {
 914         int r;
 915         Unit *u;
 916         bool delete;
 917         char *e, *w = NULL, *o = NULL, *f = NULL;
 918         MountParameters *mp;
 919
 920         assert(m);
 921         assert(what);
 922         assert(where);
 923         assert(options);
 924         assert(fstype);
 925
 926         assert(!set_flags || from_proc_self_mountinfo);
 927
 928         /* Ignore API mount points. They should never be referenced in
 929          * dependencies ever. */
 930         if (mount_point_is_api(where))
 931                 return 0;
 932
 933         if (streq(fstype, "autofs"))
 934                 return 0;
 935
 936         /* probably some kind of swap, which we don't cover for now */
 937         if (where[0] != '/')
 938                 return 0;
 939
 940         e = mount_name_from_where(where);
 941
 942         if (!e)
 943                 return -ENOMEM;
 944
 945         if (!(u = manager_get_unit(m, e))) {
 946                 delete = true;
 947
 948                 if (!(u = unit_new(m))) {
 949                         free(e);
 950                         return -ENOMEM;
 951                 }
 952
 953                 r = unit_add_name(u, e);
 954                 free(e);
 955
 956                 if (r < 0)
 957                         goto fail;
 958
 959                 if (!(MOUNT(u)->where = strdup(where))) {
 960                             r = -ENOMEM;
 961                             goto fail;
 962                     }
 963
 964                 if ((r = unit_set_description(u, where)) < 0)
 965                         goto fail;
 966
 967                 unit_add_to_load_queue(u);
 968         } else {
 969                 delete = false;
 970                 free(e);
 971         }
 972
 973         if (!(w = strdup(what)) ||
 974             !(o = strdup(options)) ||
 975             !(f = strdup(fstype))) {
 976                 r = -ENOMEM;
 977                 goto fail;
 978         }
 979
 980         if (from_proc_self_mountinfo) {
 981                 mp = &MOUNT(u)->parameters_proc_self_mountinfo;
 982
 983                 if (set_flags) {
 984                         MOUNT(u)->is_mounted = true;
 985                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
 986                         MOUNT(u)->just_changed = !streq_ptr(MOUNT(u)->parameters_proc_self_mountinfo.options, o);
 987                 }
 988
 989                 MOUNT(u)->from_proc_self_mountinfo = true;
 990
 991         } else {
 992                 mp = &MOUNT(u)->parameters_etc_fstab;
 993
 994                 MOUNT(u)->from_etc_fstab = true;
 995         }
 996
 997         free(mp->what);
 998         mp->what = w;
 999
1000         free(mp->options);
1001         mp->options = o;
1002
1003         free(mp->fstype);
1004         mp->fstype = f;
1005
1006         unit_add_to_dbus_queue(u);
1007
1008         return 0;
1009
1010 fail:
1011         free(w);
1012         free(o);
1013         free(f);
1014
1015         if (delete && u)
1016                 unit_free(u);
1017
1018         return 0;
1019 }
1020
1021 static char *fstab_node_to_udev_node(char *p) {
1022         char *dn, *t;
1023         int r;
1024
1025         /* FIXME: to follow udev's logic 100% we need to leave valid
1026          * UTF8 chars unescaped */
1027
1028         if (startswith(p, "LABEL=")) {
1029
1030                 if (!(t = xescape(p+6, "/ ")))
1031                         return NULL;
1032
1033                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
1034                 free(t);
1035
1036                 if (r < 0)
1037                         return NULL;
1038
1039                 return dn;
1040         }
1041
1042         if (startswith(p, "UUID=")) {
1043
1044                 if (!(t = xescape(p+5, "/ ")))
1045                         return NULL;
1046
1047                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
1048                 free(t);
1049
1050                 if (r < 0)
1051                         return NULL;
1052
1053                 return dn;
1054         }
1055
1056         return strdup(p);
1057 }
1058
1059 static int mount_load_etc_fstab(Manager *m) {
1060         FILE *f;
1061         int r;
1062         struct mntent* me;
1063
1064         assert(m);
1065
1066         errno = 0;
1067         if (!(f = setmntent("/etc/fstab", "r")))
1068                 return -errno;
1069
1070         while ((me = getmntent(f))) {
1071                 char *where, *what;
1072
1073                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1074                         r = -ENOMEM;
1075                         goto finish;
1076                 }
1077
1078                 if (!(where = strdup(me->mnt_dir))) {
1079                         free(what);
1080                         r = -ENOMEM;
1081                         goto finish;
1082                 }
1083
1084                 if (what[0] == '/')
1085                         path_kill_slashes(what);
1086
1087                 if (where[0] == '/')
1088                         path_kill_slashes(where);
1089
1090                 r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1091                 free(what);
1092                 free(where);
1093
1094                 if (r < 0)
1095                         goto finish;
1096         }
1097
1098         r = 0;
1099 finish:
1100
1101         endmntent(f);
1102         return r;
1103 }
1104
1105 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1106         int r;
1107         char *device, *path, *options, *fstype, *d, *p;
1108
1109         assert(m);
1110
1111         rewind(m->proc_self_mountinfo);
1112
1113         for (;;) {
1114                 int k;
1115
1116                 device = path = options = fstype = d = p = NULL;
1117
1118                 if ((k = fscanf(m->proc_self_mountinfo,
1119                                 "%*s "       /* (1) mount id */
1120                                 "%*s "       /* (2) parent id */
1121                                 "%*s "       /* (3) major:minor */
1122                                 "%*s "       /* (4) root */
1123                                 "%ms "       /* (5) mount point */
1124                                 "%ms"        /* (6) mount options */
1125                                 "%*[^-]"     /* (7) optional fields */
1126                                 "- "         /* (8) seperator */
1127                                 "%ms "       /* (9) file system type */
1128                                 "%ms"        /* (10) mount source */
1129                                 "%*[^\n]",   /* some rubbish at the end */
1130                                 &path,
1131                                 &options,
1132                                 &fstype,
1133                                 &device)) != 4) {
1134
1135                         if (k == EOF)
1136                                 break;
1137
1138                         r = -EBADMSG;
1139                         goto finish;
1140                 }
1141
1142                 if (!(d = cunescape(device)) ||
1143                     !(p = cunescape(path))) {
1144                         r = -ENOMEM;
1145                         goto finish;
1146                 }
1147
1148                 if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0)
1149                         goto finish;
1150
1151                 free(device);
1152                 free(path);
1153                 free(options);
1154                 free(fstype);
1155                 free(d);
1156                 free(p);
1157         }
1158
1159         r = 0;
1160
1161 finish:
1162         free(device);
1163         free(path);
1164         free(options);
1165         free(fstype);
1166         free(d);
1167         free(p);
1168
1169         return r;
1170 }
1171
1172 static void mount_shutdown(Manager *m) {
1173         assert(m);
1174
1175         if (m->proc_self_mountinfo)
1176                 fclose(m->proc_self_mountinfo);
1177 }
1178
1179 static int mount_enumerate(Manager *m) {
1180         int r;
1181         struct epoll_event ev;
1182         assert(m);
1183
1184         if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
1185                 return -errno;
1186
1187         m->mount_watch.type = WATCH_MOUNT;
1188         m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1189
1190         zero(ev);
1191         ev.events = EPOLLERR;
1192         ev.data.ptr = &m->mount_watch;
1193
1194         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1195                 return -errno;
1196
1197         if ((r = mount_load_etc_fstab(m)) < 0)
1198                 goto fail;
1199
1200         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1201                 goto fail;
1202
1203         return 0;
1204
1205 fail:
1206         mount_shutdown(m);
1207         return r;
1208 }
1209
1210 void mount_fd_event(Manager *m, int events) {
1211         Meta *meta;
1212         int r;
1213
1214         assert(m);
1215         assert(events == EPOLLERR);
1216
1217         /* The manager calls this for every fd event happening on the
1218          * /proc/self/mountinfo file, which informs us about mounting
1219          * table changes */
1220
1221         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1222                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
1223
1224                 /* Reset flags, just in case, for later calls */
1225                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1226                         Mount *mount = (Mount*) meta;
1227
1228                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1229                 }
1230
1231                 return;
1232         }
1233
1234         manager_dispatch_load_queue(m);
1235
1236         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1237                 Mount *mount = (Mount*) meta;
1238
1239                 if (!mount->is_mounted) {
1240                         /* This has just been unmounted. */
1241
1242                         mount->from_proc_self_mountinfo = false;
1243
1244                         switch (mount->state) {
1245
1246                         case MOUNT_MOUNTED:
1247                                 mount_enter_dead(mount, true);
1248                                 break;
1249
1250                         default:
1251                                 mount_set_state(mount, mount->state);
1252                                 break;
1253
1254                         }
1255
1256                 } else if (mount->just_mounted || mount->just_changed) {
1257
1258                         /* New or changed entrymount */
1259
1260                         switch (mount->state) {
1261
1262                         case MOUNT_DEAD:
1263                         case MOUNT_MAINTAINANCE:
1264                                 mount_enter_mounted(mount, true);
1265                                 break;
1266
1267                         case MOUNT_MOUNTING:
1268                                 mount_enter_mounting_done(mount);
1269                                 break;
1270
1271                         default:
1272                                 /* Nothing really changed, but let's
1273                                  * issue an notification call
1274                                  * nonetheless, in case somebody is
1275                                  * waiting for this. (e.g. file system
1276                                  * ro/rw remounts.) */
1277                                 mount_set_state(mount, mount->state);
1278                                 break;
1279                         }
1280                 }
1281
1282                 /* Reset the flags for later calls */
1283                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1284         }
1285 }
1286
1287 int mount_path_is_mounted(Manager *m, const char* path) {
1288         char *t;
1289         int r;
1290
1291         assert(m);
1292         assert(path);
1293
1294         if (path[0] != '/')
1295                 return 1;
1296
1297         if (!(t = strdup(path)))
1298                 return -ENOMEM;
1299
1300         path_kill_slashes(t);
1301
1302         for (;;) {
1303                 char *e, *slash;
1304                 Unit *u;
1305
1306                 if (!(e = mount_name_from_where(t))) {
1307                         r = -ENOMEM;
1308                         goto finish;
1309                 }
1310
1311                 u = manager_get_unit(m, e);
1312                 free(e);
1313
1314                 if (u &&
1315                     (MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) &&
1316                     MOUNT(u)->state != MOUNT_MOUNTED) {
1317                         r = 0;
1318                         goto finish;
1319                 }
1320
1321                 assert_se(slash = strrchr(t, '/'));
1322
1323                 if (slash == t) {
1324                         r = 1;
1325                         goto finish;
1326                 }
1327
1328                 *slash = 0;
1329         }
1330
1331         r = 1;
1332
1333 finish:
1334         free(t);
1335         return r;
1336 }
1337
1338 const UnitVTable mount_vtable = {
1339         .suffix = ".mount",
1340
1341         .no_alias = true,
1342         .no_instances = true,
1343
1344         .init = mount_init,
1345         .load = mount_load,
1346         .done = mount_done,
1347
1348         .coldplug = mount_coldplug,
1349
1350         .dump = mount_dump,
1351
1352         .start = mount_start,
1353         .stop = mount_stop,
1354         .reload = mount_reload,
1355
1356         .active_state = mount_active_state,
1357         .sub_state_to_string = mount_sub_state_to_string,
1358
1359         .sigchld_event = mount_sigchld_event,
1360         .timer_event = mount_timer_event,
1361
1362         .bus_message_handler = bus_mount_message_handler,
1363
1364         .enumerate = mount_enumerate,
1365         .shutdown = mount_shutdown
1366 };