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
  36 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
  37         [MOUNT_DEAD] = UNIT_INACTIVE,
  38         [MOUNT_MOUNTING] = UNIT_ACTIVATING,
  39         [MOUNT_MOUNTING_DONE] = UNIT_ACTIVE,
  40         [MOUNT_MOUNTED] = UNIT_ACTIVE,
  41         [MOUNT_REMOUNTING] = UNIT_ACTIVE_RELOADING,
  42         [MOUNT_UNMOUNTING] = UNIT_DEACTIVATING,
  43         [MOUNT_MOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  44         [MOUNT_MOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  45         [MOUNT_REMOUNTING_SIGTERM] = UNIT_ACTIVE_RELOADING,
  46         [MOUNT_REMOUNTING_SIGKILL] = UNIT_ACTIVE_RELOADING,
  47         [MOUNT_UNMOUNTING_SIGTERM] = UNIT_DEACTIVATING,
  48         [MOUNT_UNMOUNTING_SIGKILL] = UNIT_DEACTIVATING,
  49         [MOUNT_MAINTAINANCE] = UNIT_INACTIVE,
  50 };
  51
  52 static const char* const state_string_table[_MOUNT_STATE_MAX] = {
  53         [MOUNT_DEAD] = "dead",
  54         [MOUNT_MOUNTING] = "mounting",
  55         [MOUNT_MOUNTING_DONE] = "mounting-done",
  56         [MOUNT_MOUNTED] = "mounted",
  57         [MOUNT_REMOUNTING] = "remounting",
  58         [MOUNT_UNMOUNTING] = "unmounting",
  59         [MOUNT_MOUNTING_SIGTERM] = "mounting-sigterm",
  60         [MOUNT_MOUNTING_SIGKILL] = "mounting-sigkill",
  61         [MOUNT_REMOUNTING_SIGTERM] = "remounting-sigterm",
  62         [MOUNT_REMOUNTING_SIGKILL] = "remounting-sigkill",
  63         [MOUNT_UNMOUNTING_SIGTERM] = "unmounting-sigterm",
  64         [MOUNT_UNMOUNTING_SIGKILL] = "unmounting-sigkill",
  65         [MOUNT_MAINTAINANCE] = "maintainance"
  66 };
  67
  68 static void service_unwatch_control_pid(Mount *m) {
  69         assert(m);
  70
  71         if (m->control_pid <= 0)
  72                 return;
  73
  74         unit_unwatch_pid(UNIT(m), m->control_pid);
  75         m->control_pid = 0;
  76 }
  77
  78 static void mount_parameters_done(MountParameters *p) {
  79         assert(p);
  80
  81         free(p->what);
  82         free(p->options);
  83         free(p->fstype);
  84
  85         p->what = p->options = p->fstype = NULL;
  86 }
  87
  88 static void mount_done(Unit *u) {
  89         Mount *m = MOUNT(u);
  90
  91         assert(m);
  92
  93         free(m->where);
  94         m->where = NULL;
  95
  96         mount_parameters_done(&m->parameters_etc_fstab);
  97         mount_parameters_done(&m->parameters_proc_self_mountinfo);
  98         mount_parameters_done(&m->parameters_fragment);
  99
 100         exec_context_done(&m->exec_context);
 101         exec_command_done_array(m->exec_command, _MOUNT_EXEC_COMMAND_MAX);
 102         m->control_command = NULL;
 103
 104         service_unwatch_control_pid(m);
 105
 106         unit_unwatch_timer(u, &m->timer_watch);
 107 }
 108
 109 static void mount_init(Unit *u) {
 110         Mount *m = MOUNT(u);
 111
 112         assert(u);
 113         assert(u->meta.load_state == UNIT_STUB);
 114
 115         m->state = 0;
 116         m->from_etc_fstab = false;
 117         m->from_proc_self_mountinfo = false;
 118         m->from_fragment = false;
 119
 120         m->is_mounted = false;
 121         m->just_mounted = false;
 122         m->just_changed = false;
 123
 124         m->timeout_usec = DEFAULT_TIMEOUT_USEC;
 125
 126         zero(m->exec_command);
 127         exec_context_init(&m->exec_context);
 128
 129         m->kill_mode = 0;
 130
 131         m->control_pid = 0;
 132         m->failure = false;
 133
 134         m->timer_watch.type = WATCH_INVALID;
 135 }
 136
 137 static int mount_add_node_links(Mount *m) {
 138         Unit *device;
 139         char *e;
 140         int r;
 141         const char *what;
 142
 143         assert(m);
 144
 145         /* Adds in links to the device that this node is based on */
 146
 147         if (m->parameters_fragment.what)
 148                 what = m->parameters_fragment.what;
 149         else if (m->parameters_etc_fstab.what)
 150                 what = m->parameters_etc_fstab.what;
 151         else
 152                 /* We observe kernel mounts only while they are live,
 153                  * hence don't create any links for them */
 154                 return 0;
 155
 156         if (!path_startswith(what, "/dev/"))
 157                 return 0;
 158
 159         if (!(e = unit_name_escape_path(what+1, ".device")))
 160                 return -ENOMEM;
 161
 162         r = manager_load_unit(UNIT(m)->meta.manager, e, &device);
 163         free(e);
 164
 165         if (r < 0)
 166                 return r;
 167
 168         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, device)) < 0)
 169                 return r;
 170
 171         if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, device)) < 0)
 172                 return r;
 173
 174         if (UNIT(m)->meta.manager->running_as == MANAGER_INIT ||
 175             UNIT(m)->meta.manager->running_as == MANAGER_SYSTEM)
 176                 if ((r = unit_add_dependency(device, UNIT_WANTS, UNIT(m))) < 0)
 177                         return r;
 178
 179         return 0;
 180 }
 181
 182 static int mount_add_path_links(Mount *m) {
 183         Meta *other;
 184         int r;
 185
 186         assert(m);
 187
 188         /* Adds in link to other mount points, that might lie below or
 189          * above us in the hierarchy */
 190
 191         LIST_FOREACH(units_per_type, other, UNIT(m)->meta.manager->units_per_type[UNIT_MOUNT]) {
 192                 Mount *n;
 193
 194                 n = (Mount*) other;
 195
 196                 if (n == m)
 197                         continue;
 198
 199                 if (m->meta.load_state != UNIT_LOADED)
 200                         continue;
 201
 202                 if (path_startswith(m->where, n->where)) {
 203
 204                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(other))) < 0)
 205                                 return r;
 206
 207                         if (n->from_etc_fstab || n->from_fragment)
 208                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(other))) < 0)
 209                                         return r;
 210
 211                 } else if (path_startswith(n->where, m->where)) {
 212
 213                         if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(other))) < 0)
 214                                 return r;
 215
 216                         if (m->from_etc_fstab || m->from_fragment)
 217                                 if ((r = unit_add_dependency(UNIT(other), UNIT_REQUIRES, UNIT(m))) < 0)
 218                                         return r;
 219                 }
 220         }
 221
 222         return 0;
 223 }
 224
 225 static bool mount_test_option(const char *haystack, const char *needle) {
 226         struct mntent me;
 227
 228         assert(needle);
 229
 230         /* Like glibc's hasmntopt(), but works on a string, not a
 231          * struct mntent */
 232
 233         if (!haystack)
 234                 return false;
 235
 236         zero(me);
 237         me.mnt_opts = (char*) haystack;
 238
 239         return !!hasmntopt(&me, needle);
 240 }
 241
 242 static int mount_add_target_links(Mount *m) {
 243         const char *target;
 244         MountParameters *p;
 245         Unit *u;
 246         int r;
 247
 248         assert(m);
 249
 250         if (m->from_fragment)
 251                 p = &m->parameters_fragment;
 252         else if (m->from_etc_fstab)
 253                 p = &m->parameters_etc_fstab;
 254         else
 255                 return 0;
 256
 257         if (!p->fstype)
 258                 return 0;
 259
 260         if (mount_test_option(p->options, MNTOPT_NOAUTO))
 261                 return 0;
 262
 263         if (mount_test_option(p->options, "_netdev") ||
 264             fstype_is_network(p->fstype))
 265                 target = SPECIAL_REMOTE_FS_TARGET;
 266         else
 267                 target = SPECIAL_LOCAL_FS_TARGET;
 268
 269         if ((r = manager_load_unit(UNIT(m)->meta.manager, target, &u)) < 0)
 270                 return r;
 271
 272         if ((r = unit_add_dependency(u, UNIT_WANTS, UNIT(m))) < 0)
 273                 return r;
 274
 275         return unit_add_dependency(UNIT(m), UNIT_BEFORE, u);
 276 }
 277
 278 static int mount_load(Unit *u) {
 279         Mount *m = MOUNT(u);
 280         int r;
 281
 282         assert(u);
 283         assert(u->meta.load_state == UNIT_STUB);
 284
 285         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 286                 return r;
 287
 288         /* This is a new unit? Then let's add in some extras */
 289         if (u->meta.load_state == UNIT_LOADED) {
 290
 291                 /* Minor validity checking */
 292                 if ((m->parameters_fragment.options || m->parameters_fragment.fstype) && !m->parameters_fragment.what)
 293                         return -EBADMSG;
 294
 295                 if (m->parameters_fragment.what)
 296                         m->from_fragment = true;
 297
 298                 if ((r = mount_add_node_links(MOUNT(u))) < 0)
 299                         return r;
 300
 301                 if ((r = mount_add_path_links(MOUNT(u))) < 0)
 302                         return r;
 303
 304                 if ((r = mount_add_target_links(MOUNT(u))) < 0)
 305                         return r;
 306
 307                 if ((r = unit_add_default_cgroup(u)) < 0)
 308                         return r;
 309         }
 310
 311         return 0;
 312 }
 313
 314 static void mount_set_state(Mount *m, MountState state) {
 315         MountState old_state;
 316         assert(m);
 317
 318         old_state = m->state;
 319         m->state = state;
 320
 321         if (state != MOUNT_MOUNTING &&
 322             state != MOUNT_MOUNTING_DONE &&
 323             state != MOUNT_REMOUNTING &&
 324             state != MOUNT_UNMOUNTING &&
 325             state != MOUNT_MOUNTING_SIGTERM &&
 326             state != MOUNT_MOUNTING_SIGKILL &&
 327             state != MOUNT_UNMOUNTING_SIGTERM &&
 328             state != MOUNT_UNMOUNTING_SIGKILL &&
 329             state != MOUNT_REMOUNTING_SIGTERM &&
 330             state != MOUNT_REMOUNTING_SIGKILL) {
 331                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 332                 service_unwatch_control_pid(m);
 333                 m->control_command = NULL;
 334         }
 335
 336         if (state != old_state)
 337                 log_debug("%s changed %s → %s", unit_id(UNIT(m)), state_string_table[old_state], state_string_table[state]);
 338
 339         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 340 }
 341
 342 static int mount_coldplug(Unit *u) {
 343         Mount *m = MOUNT(u);
 344
 345         assert(m);
 346         assert(m->state == MOUNT_DEAD);
 347
 348         if (m->from_proc_self_mountinfo)
 349                 mount_set_state(m, MOUNT_MOUNTED);
 350
 351         return 0;
 352 }
 353
 354 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 355         pid_t pid;
 356         int r;
 357
 358         assert(m);
 359         assert(c);
 360         assert(_pid);
 361
 362         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 363                 goto fail;
 364
 365         if ((r = exec_spawn(c,
 366                             &m->exec_context,
 367                             NULL, 0,
 368                             true,
 369                             true,
 370                             UNIT(m)->meta.manager->confirm_spawn,
 371                             UNIT(m)->meta.cgroup_bondings,
 372                             &pid)) < 0)
 373                 goto fail;
 374
 375         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 376                 /* FIXME: we need to do something here */
 377                 goto fail;
 378
 379         *_pid = pid;
 380
 381         return 0;
 382
 383 fail:
 384         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 385
 386         return r;
 387 }
 388
 389 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 390         Mount *m = MOUNT(u);
 391         MountParameters *p;
 392
 393         assert(m);
 394         assert(f);
 395
 396         if (m->from_proc_self_mountinfo)
 397                 p = &m->parameters_proc_self_mountinfo;
 398         else if (m->from_fragment)
 399                 p = &m->parameters_fragment;
 400         else
 401                 p = &m->parameters_etc_fstab;
 402
 403         fprintf(f,
 404                 "%sMount State: %s\n"
 405                 "%sWhere: %s\n"
 406                 "%sWhat: %s\n"
 407                 "%sFile System Type: %s\n"
 408                 "%sOptions: %s\n"
 409                 "%sFrom /etc/fstab: %s\n"
 410                 "%sFrom /proc/self/mountinfo: %s\n"
 411                 "%sFrom fragment: %s\n"
 412                 "%sKillMode: %s\n",
 413                 prefix, state_string_table[m->state],
 414                 prefix, m->where,
 415                 prefix, strna(p->what),
 416                 prefix, strna(p->fstype),
 417                 prefix, strna(p->options),
 418                 prefix, yes_no(m->from_etc_fstab),
 419                 prefix, yes_no(m->from_proc_self_mountinfo),
 420                 prefix, yes_no(m->from_fragment),
 421                 prefix, kill_mode_to_string(m->kill_mode));
 422
 423         if (m->control_pid > 0)
 424                 fprintf(f,
 425                         "%sControl PID: %llu\n",
 426                         prefix, (unsigned long long) m->control_pid);
 427
 428         exec_context_dump(&m->exec_context, f, prefix);
 429 }
 430
 431 static void mount_enter_dead(Mount *m, bool success) {
 432         assert(m);
 433
 434         if (!success)
 435                 m->failure = true;
 436
 437         mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD);
 438 }
 439
 440 static void mount_enter_mounted(Mount *m, bool success) {
 441         assert(m);
 442
 443         if (!success)
 444                 m->failure = true;
 445
 446         mount_set_state(m, MOUNT_MOUNTED);
 447 }
 448
 449 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 450         int r;
 451         bool sent = false;
 452
 453         assert(m);
 454
 455         if (!success)
 456                 m->failure = true;
 457
 458         if (m->kill_mode != KILL_NONE) {
 459                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 460                            state == MOUNT_UNMOUNTING_SIGTERM ||
 461                            state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
 462
 463                 if (m->kill_mode == KILL_CONTROL_GROUP) {
 464
 465                         if ((r = cgroup_bonding_kill_list(UNIT(m)->meta.cgroup_bondings, sig)) < 0) {
 466                                 if (r != -EAGAIN && r != -ESRCH)
 467                                         goto fail;
 468                         } else
 469                                 sent = true;
 470                 }
 471
 472                 if (!sent && m->control_pid > 0)
 473                         if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) {
 474                                 r = -errno;
 475                                 goto fail;
 476                         }
 477         }
 478
 479         if (sent) {
 480                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 481                         goto fail;
 482
 483                 mount_set_state(m, state);
 484         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 485                 mount_enter_mounted(m, true);
 486         else
 487                 mount_enter_dead(m, true);
 488
 489         return;
 490
 491 fail:
 492         log_warning("%s failed to kill processes: %s", unit_id(UNIT(m)), strerror(-r));
 493
 494         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 495                 mount_enter_mounted(m, false);
 496         else
 497                 mount_enter_dead(m, false);
 498 }
 499
 500 static void mount_enter_unmounting(Mount *m, bool success) {
 501         ExecCommand *c;
 502         int r;
 503
 504         assert(m);
 505
 506         if (!success)
 507                 m->failure = true;
 508
 509         m->control_command = c = m->exec_command + MOUNT_EXEC_UNMOUNT;
 510
 511         if ((r = exec_command_set(
 512                              c,
 513                              "/bin/umount",
 514                              m->where,
 515                              NULL)) < 0)
 516                 goto fail;
 517
 518         service_unwatch_control_pid(m);
 519
 520         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 521                 goto fail;
 522
 523         mount_set_state(m, MOUNT_UNMOUNTING);
 524
 525         return;
 526
 527 fail:
 528         log_warning("%s failed to run umount exectuable: %s", unit_id(UNIT(m)), strerror(-r));
 529         mount_enter_mounted(m, false);
 530 }
 531
 532 static void mount_enter_mounting(Mount *m, bool success) {
 533         ExecCommand *c;
 534         int r;
 535
 536         assert(m);
 537
 538         if (!success)
 539                 m->failure = true;
 540
 541         m->control_command = c = m->exec_command + MOUNT_EXEC_MOUNT;
 542
 543         if (m->from_fragment)
 544                 r = exec_command_set(
 545                                 c,
 546                                 "/bin/mount",
 547                                 m->parameters_fragment.what,
 548                                 m->where,
 549                                 "-t", m->parameters_fragment.fstype,
 550                                 "-o", m->parameters_fragment.options,
 551                                 NULL);
 552         else if (m->from_etc_fstab)
 553                 r = exec_command_set(
 554                                 c,
 555                                 "/bin/mount",
 556                                 m->where,
 557                                 NULL);
 558         else
 559                 r = -ENOENT;
 560
 561         if (r < 0)
 562                 goto fail;
 563
 564         service_unwatch_control_pid(m);
 565
 566         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 567                 goto fail;
 568
 569         mount_set_state(m, MOUNT_MOUNTING);
 570
 571         return;
 572
 573 fail:
 574         log_warning("%s failed to run mount exectuable: %s", unit_id(UNIT(m)), strerror(-r));
 575         mount_enter_dead(m, false);
 576 }
 577
 578 static void mount_enter_mounting_done(Mount *m, bool success) {
 579         assert(m);
 580
 581         if (!success)
 582                 m->failure = true;
 583
 584         mount_set_state(m, MOUNT_MOUNTING_DONE);
 585 }
 586
 587 static void mount_enter_remounting(Mount *m, bool success) {
 588         ExecCommand *c;
 589         int r;
 590
 591         assert(m);
 592
 593         if (!success)
 594                 m->failure = true;
 595
 596         m->control_command = c = m->exec_command + MOUNT_EXEC_REMOUNT;
 597
 598         if (m->from_fragment) {
 599                 char *buf = NULL;
 600                 const char *o;
 601
 602                 if (m->parameters_fragment.options) {
 603                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 604                                 r = -ENOMEM;
 605                                 goto fail;
 606                         }
 607
 608                         o = buf;
 609                 } else
 610                         o = "remount";
 611
 612                 r = exec_command_set(
 613                                 c,
 614                                 "/bin/mount",
 615                                 m->parameters_fragment.what,
 616                                 m->where,
 617                                 "-t", m->parameters_fragment.fstype,
 618                                 "-o", o,
 619                                 NULL);
 620
 621                 free(buf);
 622         } else if (m->from_etc_fstab)
 623                 r = exec_command_set(
 624                                 c,
 625                                 "/bin/mount",
 626                                 m->where,
 627                                 "-o", "remount",
 628                                 NULL);
 629         else
 630                 r = -ENOENT;
 631
 632         if (r < 0) {
 633                 r = -ENOMEM;
 634                 goto fail;
 635         }
 636
 637         service_unwatch_control_pid(m);
 638
 639         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 640                 goto fail;
 641
 642         mount_set_state(m, MOUNT_REMOUNTING);
 643
 644         return;
 645
 646 fail:
 647         mount_enter_mounted(m, false);
 648 }
 649
 650 static int mount_start(Unit *u) {
 651         Mount *m = MOUNT(u);
 652
 653         assert(m);
 654
 655         /* We cannot fulfill this request right now, try again later
 656          * please! */
 657         if (m->state == MOUNT_UNMOUNTING ||
 658             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 659             m->state == MOUNT_UNMOUNTING_SIGKILL)
 660                 return -EAGAIN;
 661
 662         /* Already on it! */
 663         if (m->state == MOUNT_MOUNTING ||
 664             m->state == MOUNT_MOUNTING_SIGTERM ||
 665             m->state == MOUNT_MOUNTING_SIGKILL)
 666                 return 0;
 667
 668         assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTAINANCE);
 669
 670         m->failure = false;
 671
 672         mount_enter_mounting(m, true);
 673         return 0;
 674 }
 675
 676 static int mount_stop(Unit *u) {
 677         Mount *m = MOUNT(u);
 678
 679         assert(m);
 680
 681         /* Cann't do this right now. */
 682         if (m->state == MOUNT_MOUNTING ||
 683             m->state == MOUNT_MOUNTING_DONE ||
 684             m->state == MOUNT_MOUNTING_SIGTERM ||
 685             m->state == MOUNT_MOUNTING_SIGKILL ||
 686             m->state == MOUNT_REMOUNTING ||
 687             m->state == MOUNT_REMOUNTING_SIGTERM ||
 688             m->state == MOUNT_REMOUNTING_SIGKILL)
 689                 return -EAGAIN;
 690
 691         /* Already on it */
 692         if (m->state == MOUNT_UNMOUNTING ||
 693             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 694             m->state == MOUNT_UNMOUNTING_SIGTERM)
 695                 return 0;
 696
 697         assert(m->state == MOUNT_MOUNTED);
 698
 699         mount_enter_unmounting(m, true);
 700         return 0;
 701 }
 702
 703 static int mount_reload(Unit *u) {
 704         Mount *m = MOUNT(u);
 705
 706         assert(m);
 707
 708         if (m->state == MOUNT_MOUNTING_DONE)
 709                 return -EAGAIN;
 710
 711         assert(m->state == MOUNT_MOUNTED);
 712
 713         mount_enter_remounting(m, true);
 714         return 0;
 715 }
 716
 717 static UnitActiveState mount_active_state(Unit *u) {
 718         assert(u);
 719
 720         return state_translation_table[MOUNT(u)->state];
 721 }
 722
 723 static const char *mount_sub_state_to_string(Unit *u) {
 724         assert(u);
 725
 726         return state_string_table[MOUNT(u)->state];
 727 }
 728
 729 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 730         Mount *m = MOUNT(u);
 731         bool success;
 732
 733         assert(m);
 734         assert(pid >= 0);
 735
 736         success = code == CLD_EXITED && status == 0;
 737         m->failure = m->failure || !success;
 738
 739         assert(m->control_pid == pid);
 740         assert(m->control_command);
 741
 742         exec_status_fill(&m->control_command->exec_status, pid, code, status);
 743         m->control_pid = 0;
 744
 745         log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 746
 747         /* Note that mount(8) returning and the kernel sending us a
 748          * mount table change event might happen out-of-order. If an
 749          * operation succeed we assume the kernel will follow soon too
 750          * and already change into the resulting state.  If it fails
 751          * we check if the kernel still knows about the mount. and
 752          * change state accordingly. */
 753
 754         switch (m->state) {
 755
 756         case MOUNT_MOUNTING:
 757         case MOUNT_MOUNTING_DONE:
 758         case MOUNT_MOUNTING_SIGKILL:
 759         case MOUNT_MOUNTING_SIGTERM:
 760         case MOUNT_REMOUNTING:
 761         case MOUNT_REMOUNTING_SIGKILL:
 762         case MOUNT_REMOUNTING_SIGTERM:
 763
 764                 if (success && m->from_proc_self_mountinfo)
 765                         mount_enter_mounted(m, true);
 766                 else if (m->from_proc_self_mountinfo)
 767                         mount_enter_mounted(m, false);
 768                 else
 769                         mount_enter_dead(m, false);
 770                 break;
 771
 772         case MOUNT_UNMOUNTING:
 773         case MOUNT_UNMOUNTING_SIGKILL:
 774         case MOUNT_UNMOUNTING_SIGTERM:
 775
 776                 if (success)
 777                         mount_enter_dead(m, true);
 778                 else if (m->from_proc_self_mountinfo)
 779                         mount_enter_mounted(m, false);
 780                 else
 781                         mount_enter_dead(m, false);
 782                 break;
 783
 784         default:
 785                 assert_not_reached("Uh, control process died at wrong time.");
 786         }
 787 }
 788
 789 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 790         Mount *m = MOUNT(u);
 791
 792         assert(m);
 793         assert(elapsed == 1);
 794         assert(w == &m->timer_watch);
 795
 796         switch (m->state) {
 797
 798         case MOUNT_MOUNTING:
 799         case MOUNT_MOUNTING_DONE:
 800                 log_warning("%s mounting timed out. Stopping.", unit_id(u));
 801                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
 802                 break;
 803
 804         case MOUNT_REMOUNTING:
 805                 log_warning("%s remounting timed out. Stopping.", unit_id(u));
 806                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
 807                 break;
 808
 809         case MOUNT_UNMOUNTING:
 810                 log_warning("%s unmounting timed out. Stopping.", unit_id(u));
 811                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
 812                 break;
 813
 814         case MOUNT_MOUNTING_SIGTERM:
 815                 log_warning("%s mounting timed out. Killing.", unit_id(u));
 816                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
 817                 break;
 818
 819         case MOUNT_REMOUNTING_SIGTERM:
 820                 log_warning("%s remounting timed out. Killing.", unit_id(u));
 821                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
 822                 break;
 823
 824         case MOUNT_UNMOUNTING_SIGTERM:
 825                 log_warning("%s unmounting timed out. Killing.", unit_id(u));
 826                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
 827                 break;
 828
 829         case MOUNT_MOUNTING_SIGKILL:
 830         case MOUNT_REMOUNTING_SIGKILL:
 831         case MOUNT_UNMOUNTING_SIGKILL:
 832                 log_warning("%s mount process still around after SIGKILL. Ignoring.", unit_id(u));
 833
 834                 if (m->from_proc_self_mountinfo)
 835                         mount_enter_mounted(m, false);
 836                 else
 837                         mount_enter_dead(m, false);
 838                 break;
 839
 840         default:
 841                 assert_not_reached("Timeout at wrong time.");
 842         }
 843 }
 844
 845 static int mount_add_one(
 846                 Manager *m,
 847                 const char *what,
 848                 const char *where,
 849                 const char *options,
 850                 const char *fstype,
 851                 bool from_proc_self_mountinfo,
 852                 bool set_flags) {
 853         int r;
 854         Unit *u;
 855         bool delete;
 856         char *e, *w = NULL, *o = NULL, *f = NULL;
 857         MountParameters *mp;
 858
 859         assert(m);
 860         assert(what);
 861         assert(where);
 862         assert(options);
 863         assert(fstype);
 864
 865         assert(!set_flags || from_proc_self_mountinfo);
 866
 867         /* Ignore API mount points. They should never be referenced in
 868          * dependencies ever. */
 869         if (mount_point_is_api(where))
 870                 return 0;
 871
 872         /* probably some kind of swap, which we don't cover for now */
 873         if (where[0] != '/')
 874                 return 0;
 875
 876         if (streq(where, "/"))
 877                 e = strdup("-.mount");
 878         else
 879                 e = unit_name_escape_path(where+1, ".mount");
 880
 881         if (!e)
 882                 return -ENOMEM;
 883
 884         if (!(u = manager_get_unit(m, e))) {
 885                 delete = true;
 886
 887                 if (!(u = unit_new(m))) {
 888                         free(e);
 889                         return -ENOMEM;
 890                 }
 891
 892                 r = unit_add_name(u, e);
 893                 free(e);
 894
 895                 if (r < 0)
 896                         goto fail;
 897
 898                 if (!(MOUNT(u)->where = strdup(where))) {
 899                             r = -ENOMEM;
 900                             goto fail;
 901                     }
 902
 903                 if ((r = unit_set_description(u, where)) < 0)
 904                         goto fail;
 905
 906                 unit_add_to_load_queue(u);
 907         } else {
 908                 delete = false;
 909                 free(e);
 910         }
 911
 912         if (!(w = strdup(what)) ||
 913             !(o = strdup(options)) ||
 914             !(f = strdup(fstype))) {
 915                 r = -ENOMEM;
 916                 goto fail;
 917         }
 918
 919         if (from_proc_self_mountinfo) {
 920                 mp = &MOUNT(u)->parameters_proc_self_mountinfo;
 921
 922                 if (set_flags) {
 923                         MOUNT(u)->is_mounted = true;
 924                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
 925                         MOUNT(u)->just_changed = !streq_ptr(MOUNT(u)->parameters_proc_self_mountinfo.options, o);
 926                 }
 927
 928                 MOUNT(u)->from_proc_self_mountinfo = true;
 929
 930         } else {
 931                 mp = &MOUNT(u)->parameters_etc_fstab;
 932
 933                 MOUNT(u)->from_etc_fstab = true;
 934         }
 935
 936         free(mp->what);
 937         mp->what = w;
 938
 939         free(mp->options);
 940         mp->options = o;
 941
 942         free(mp->fstype);
 943         mp->fstype = f;
 944
 945         unit_add_to_dbus_queue(u);
 946
 947         return 0;
 948
 949 fail:
 950         free(w);
 951         free(o);
 952         free(f);
 953
 954         if (delete && u)
 955                 unit_free(u);
 956
 957         return 0;
 958 }
 959
 960 static char *fstab_node_to_udev_node(char *p) {
 961         char *dn, *t;
 962         int r;
 963
 964         /* FIXME: to follow udev's logic 100% we need to leave valid
 965          * UTF8 chars unescaped */
 966
 967         if (startswith(p, "LABEL=")) {
 968
 969                 if (!(t = xescape(p+6, "/ ")))
 970                         return NULL;
 971
 972                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
 973                 free(t);
 974
 975                 if (r < 0)
 976                         return NULL;
 977
 978                 return dn;
 979         }
 980
 981         if (startswith(p, "UUID=")) {
 982
 983                 if (!(t = xescape(p+5, "/ ")))
 984                         return NULL;
 985
 986                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
 987                 free(t);
 988
 989                 if (r < 0)
 990                         return NULL;
 991
 992                 return dn;
 993         }
 994
 995         return strdup(p);
 996 }
 997
 998 static int mount_load_etc_fstab(Manager *m) {
 999         FILE *f;
1000         int r;
1001         struct mntent* me;
1002
1003         assert(m);
1004
1005         errno = 0;
1006         if (!(f = setmntent("/etc/fstab", "r")))
1007                 return -errno;
1008
1009         while ((me = getmntent(f))) {
1010                 char *where, *what;
1011
1012                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1013                         r = -ENOMEM;
1014                         goto finish;
1015                 }
1016
1017                 if (!(where = strdup(me->mnt_dir))) {
1018                         free(what);
1019                         r = -ENOMEM;
1020                         goto finish;
1021                 }
1022
1023                 if (what[0] == '/')
1024                         path_kill_slashes(what);
1025
1026                 if (where[0] == '/')
1027                         path_kill_slashes(where);
1028
1029                 r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1030                 free(what);
1031                 free(where);
1032
1033                 if (r < 0)
1034                         goto finish;
1035         }
1036
1037         r = 0;
1038 finish:
1039
1040         endmntent(f);
1041         return r;
1042 }
1043
1044 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1045         int r;
1046         char *device, *path, *options, *fstype, *d, *p;
1047
1048         assert(m);
1049
1050         rewind(m->proc_self_mountinfo);
1051
1052         for (;;) {
1053                 int k;
1054
1055                 device = path = options = fstype = d = p = NULL;
1056
1057                 if ((k = fscanf(m->proc_self_mountinfo,
1058                                 "%*s "       /* (1) mount id */
1059                                 "%*s "       /* (2) parent id */
1060                                 "%*s "       /* (3) major:minor */
1061                                 "%*s "       /* (4) root */
1062                                 "%ms "       /* (5) mount point */
1063                                 "%ms"        /* (6) mount options */
1064                                 "%*[^-]"     /* (7) optional fields */
1065                                 "- "         /* (8) seperator */
1066                                 "%ms "       /* (9) file system type */
1067                                 "%ms"        /* (10) mount source */
1068                                 "%*[^\n]",   /* some rubbish at the end */
1069                                 &path,
1070                                 &options,
1071                                 &fstype,
1072                                 &device)) != 4) {
1073
1074                         if (k == EOF)
1075                                 break;
1076
1077                         r = -EBADMSG;
1078                         goto finish;
1079                 }
1080
1081                 if (!(d = cunescape(device)) ||
1082                     !(p = cunescape(path))) {
1083                         r = -ENOMEM;
1084                         goto finish;
1085                 }
1086
1087                 if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0)
1088                         goto finish;
1089
1090                 free(device);
1091                 free(path);
1092                 free(options);
1093                 free(fstype);
1094                 free(d);
1095                 free(p);
1096         }
1097
1098         r = 0;
1099
1100 finish:
1101         free(device);
1102         free(path);
1103         free(options);
1104         free(fstype);
1105         free(d);
1106         free(p);
1107
1108         return r;
1109 }
1110
1111 static void mount_shutdown(Manager *m) {
1112         assert(m);
1113
1114         if (m->proc_self_mountinfo)
1115                 fclose(m->proc_self_mountinfo);
1116 }
1117
1118 static int mount_enumerate(Manager *m) {
1119         int r;
1120         struct epoll_event ev;
1121         assert(m);
1122
1123         if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
1124                 return -errno;
1125
1126         m->mount_watch.type = WATCH_MOUNT;
1127         m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1128
1129         zero(ev);
1130         ev.events = EPOLLERR;
1131         ev.data.ptr = &m->mount_watch;
1132
1133         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1134                 return -errno;
1135
1136         if ((r = mount_load_etc_fstab(m)) < 0)
1137                 goto fail;
1138
1139         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1140                 goto fail;
1141
1142         return 0;
1143
1144 fail:
1145         mount_shutdown(m);
1146         return r;
1147 }
1148
1149 void mount_fd_event(Manager *m, int events) {
1150         Meta *meta;
1151         int r;
1152
1153         assert(m);
1154         assert(events == EPOLLERR);
1155
1156         /* The manager calls this for every fd event happening on the
1157          * /proc/self/mountinfo file, which informs us about mounting
1158          * table changes */
1159
1160         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1161                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
1162
1163                 /* Reset flags, just in case, for later calls */
1164                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1165                         Mount *mount = (Mount*) meta;
1166
1167                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1168                 }
1169
1170                 return;
1171         }
1172
1173         manager_dispatch_load_queue(m);
1174
1175         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1176                 Mount *mount = (Mount*) meta;
1177
1178                 if (!mount->is_mounted) {
1179                         /* This has just been unmounted. */
1180
1181                         mount->from_proc_self_mountinfo = false;
1182
1183                         switch (mount->state) {
1184
1185                         case MOUNT_MOUNTED:
1186                                 mount_enter_dead(mount, true);
1187                                 break;
1188
1189                         default:
1190                                 mount_set_state(mount, mount->state);
1191                                 break;
1192
1193                         }
1194
1195                 } else if (mount->just_mounted || mount->just_changed) {
1196
1197                         /* New or changed entrymount */
1198
1199                         switch (mount->state) {
1200
1201                         case MOUNT_DEAD:
1202                         case MOUNT_MAINTAINANCE:
1203                                 mount_enter_mounted(mount, true);
1204                                 break;
1205
1206                         case MOUNT_MOUNTING:
1207                                 mount_enter_mounting_done(mount, true);
1208                                 break;
1209
1210                         default:
1211                                 /* Nothing really changed, but let's
1212                                  * issue an notification call
1213                                  * nonetheless, in case somebody is
1214                                  * waiting for this. (e.g. file system
1215                                  * ro/rw remounts.) */
1216                                 mount_set_state(mount, mount->state);
1217                                 break;
1218                         }
1219                 }
1220
1221                 /* Reset the flags for later calls */
1222                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1223         }
1224 }
1225
1226 int mount_path_is_mounted(Manager *m, const char* path) {
1227         char *t;
1228         int r;
1229
1230         assert(m);
1231         assert(path);
1232
1233         if (path[0] != '/')
1234                 return 1;
1235
1236         if (!(t = strdup(path)))
1237                 return -ENOMEM;
1238
1239         path_kill_slashes(t);
1240
1241         for (;;) {
1242                 char *e, *slash;
1243                 Unit *u;
1244
1245                 if (!(e = unit_name_escape_path(t+1, ".mount"))) {
1246                         r = -ENOMEM;
1247                         goto finish;
1248                 }
1249
1250                 u = manager_get_unit(m, e);
1251                 free(e);
1252
1253                 if (u &&
1254                     (MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) &&
1255                     MOUNT(u)->state != MOUNT_MOUNTED) {
1256                         r = 0;
1257                         goto finish;
1258                 }
1259
1260                 assert_se(slash = strrchr(t, '/'));
1261
1262                 if (slash == t) {
1263                         r = 1;
1264                         goto finish;
1265                 }
1266
1267                 *slash = 0;
1268         }
1269
1270         r = 1;
1271
1272 finish:
1273         free(t);
1274         return r;
1275 }
1276
1277 const UnitVTable mount_vtable = {
1278         .suffix = ".mount",
1279
1280         .no_alias = true,
1281
1282         .init = mount_init,
1283         .load = mount_load,
1284         .done = mount_done,
1285
1286         .coldplug = mount_coldplug,
1287
1288         .dump = mount_dump,
1289
1290         .start = mount_start,
1291         .stop = mount_stop,
1292         .reload = mount_reload,
1293
1294         .active_state = mount_active_state,
1295         .sub_state_to_string = mount_sub_state_to_string,
1296
1297         .sigchld_event = mount_sigchld_event,
1298         .timer_event = mount_timer_event,
1299
1300         .enumerate = mount_enumerate,
1301         .shutdown = mount_shutdown
1302 };