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.cgroup_bondings,
 371                             &pid)) < 0)
 372                 goto fail;
 373
 374         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 375                 /* FIXME: we need to do something here */
 376                 goto fail;
 377
 378         *_pid = pid;
 379
 380         return 0;
 381
 382 fail:
 383         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 384
 385         return r;
 386 }
 387
 388 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 389         Mount *m = MOUNT(u);
 390         MountParameters *p;
 391
 392         assert(m);
 393         assert(f);
 394
 395         if (m->from_proc_self_mountinfo)
 396                 p = &m->parameters_proc_self_mountinfo;
 397         else if (m->from_fragment)
 398                 p = &m->parameters_fragment;
 399         else
 400                 p = &m->parameters_etc_fstab;
 401
 402         fprintf(f,
 403                 "%sMount State: %s\n"
 404                 "%sWhere: %s\n"
 405                 "%sWhat: %s\n"
 406                 "%sFile System Type: %s\n"
 407                 "%sOptions: %s\n"
 408                 "%sFrom /etc/fstab: %s\n"
 409                 "%sFrom /proc/self/mountinfo: %s\n"
 410                 "%sFrom fragment: %s\n"
 411                 "%sKillMode: %s\n",
 412                 prefix, state_string_table[m->state],
 413                 prefix, m->where,
 414                 prefix, strna(p->what),
 415                 prefix, strna(p->fstype),
 416                 prefix, strna(p->options),
 417                 prefix, yes_no(m->from_etc_fstab),
 418                 prefix, yes_no(m->from_proc_self_mountinfo),
 419                 prefix, yes_no(m->from_fragment),
 420                 prefix, kill_mode_to_string(m->kill_mode));
 421
 422         if (m->control_pid > 0)
 423                 fprintf(f,
 424                         "%sControl PID: %llu\n",
 425                         prefix, (unsigned long long) m->control_pid);
 426
 427         exec_context_dump(&m->exec_context, f, prefix);
 428 }
 429
 430 static void mount_enter_dead(Mount *m, bool success) {
 431         assert(m);
 432
 433         if (!success)
 434                 m->failure = true;
 435
 436         mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD);
 437 }
 438
 439 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 440         int r;
 441
 442         assert(m);
 443
 444         if (!success)
 445                 m->failure = true;
 446
 447         if (m->control_pid > 0) {
 448                 int sig;
 449                 bool sent = false;
 450
 451                 sig = (state == MOUNT_MOUNTING_SIGTERM ||
 452                        state == MOUNT_UNMOUNTING_SIGTERM ||
 453                        state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
 454
 455                 if (m->kill_mode == KILL_CONTROL_GROUP) {
 456
 457                         if ((r = cgroup_bonding_kill_list(UNIT(m)->meta.cgroup_bondings, sig)) < 0) {
 458                                 if (r != -EAGAIN && r != -ESRCH)
 459                                         goto fail;
 460                         } else
 461                                 sent = true;
 462                 }
 463
 464                 if (!sent)
 465                         if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) {
 466                                 r = -errno;
 467                                 goto fail;
 468                         }
 469         }
 470
 471         mount_set_state(m, state);
 472
 473         if (m->control_pid <= 0)
 474                 mount_enter_dead(m, true);
 475
 476         return;
 477
 478 fail:
 479         log_warning("%s failed to kill processes: %s", unit_id(UNIT(m)), strerror(-r));
 480         mount_enter_dead(m, false);
 481 }
 482
 483 static void mount_enter_mounted(Mount *m, bool success) {
 484         assert(m);
 485
 486         if (!success)
 487                 m->failure = true;
 488
 489         mount_set_state(m, MOUNT_MOUNTED);
 490 }
 491
 492 static void mount_enter_unmounting(Mount *m, bool success) {
 493         ExecCommand *c;
 494         int r;
 495
 496         assert(m);
 497
 498         if (!success)
 499                 m->failure = true;
 500
 501         m->control_command = c = m->exec_command + MOUNT_EXEC_UNMOUNT;
 502
 503         if ((r = exec_command_set(
 504                              c,
 505                              "/bin/umount",
 506                              m->where,
 507                              NULL)) < 0)
 508                 goto fail;
 509
 510         service_unwatch_control_pid(m);
 511
 512         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 513                 goto fail;
 514
 515         mount_set_state(m, MOUNT_UNMOUNTING);
 516
 517         return;
 518
 519 fail:
 520         log_warning("%s failed to run umount exectuable: %s", unit_id(UNIT(m)), strerror(-r));
 521         mount_enter_mounted(m, false);
 522 }
 523
 524 static void mount_enter_mounting(Mount *m, bool success) {
 525         ExecCommand *c;
 526         int r;
 527
 528         assert(m);
 529
 530         if (!success)
 531                 m->failure = true;
 532
 533         m->control_command = c = m->exec_command + MOUNT_EXEC_MOUNT;
 534
 535         if (m->from_fragment)
 536                 r = exec_command_set(
 537                                 c,
 538                                 "/bin/mount",
 539                                 m->parameters_fragment.what,
 540                                 m->where,
 541                                 "-t", m->parameters_fragment.fstype,
 542                                 "-o", m->parameters_fragment.options,
 543                                 NULL);
 544         else if (m->from_etc_fstab)
 545                 r = exec_command_set(
 546                                 c,
 547                                 "/bin/mount",
 548                                 m->where,
 549                                 NULL);
 550         else
 551                 r = -ENOENT;
 552
 553         if (r < 0)
 554                 goto fail;
 555
 556         service_unwatch_control_pid(m);
 557
 558         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 559                 goto fail;
 560
 561         mount_set_state(m, MOUNT_MOUNTING);
 562
 563         return;
 564
 565 fail:
 566         log_warning("%s failed to run mount exectuable: %s", unit_id(UNIT(m)), strerror(-r));
 567         mount_enter_dead(m, false);
 568 }
 569
 570 static void mount_enter_mounting_done(Mount *m, bool success) {
 571         assert(m);
 572
 573         if (!success)
 574                 m->failure = true;
 575
 576         mount_set_state(m, MOUNT_MOUNTING_DONE);
 577 }
 578
 579 static void mount_enter_remounting(Mount *m, bool success) {
 580         ExecCommand *c;
 581         int r;
 582
 583         assert(m);
 584
 585         if (!success)
 586                 m->failure = true;
 587
 588         m->control_command = c = m->exec_command + MOUNT_EXEC_REMOUNT;
 589
 590         if (m->from_fragment) {
 591                 char *buf = NULL;
 592                 const char *o;
 593
 594                 if (m->parameters_fragment.options) {
 595                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 596                                 r = -ENOMEM;
 597                                 goto fail;
 598                         }
 599
 600                         o = buf;
 601                 } else
 602                         o = "remount";
 603
 604                 r = exec_command_set(
 605                                 c,
 606                                 "/bin/mount",
 607                                 m->parameters_fragment.what,
 608                                 m->where,
 609                                 "-t", m->parameters_fragment.fstype,
 610                                 "-o", o,
 611                                 NULL);
 612
 613                 free(buf);
 614         } else if (m->from_etc_fstab)
 615                 r = exec_command_set(
 616                                 c,
 617                                 "/bin/mount",
 618                                 m->where,
 619                                 "-o", "remount",
 620                                 NULL);
 621         else
 622                 r = -ENOENT;
 623
 624         if (r < 0) {
 625                 r = -ENOMEM;
 626                 goto fail;
 627         }
 628
 629         service_unwatch_control_pid(m);
 630
 631         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 632                 goto fail;
 633
 634         mount_set_state(m, MOUNT_REMOUNTING);
 635
 636         return;
 637
 638 fail:
 639         mount_enter_mounted(m, false);
 640 }
 641
 642 static int mount_start(Unit *u) {
 643         Mount *m = MOUNT(u);
 644
 645         assert(m);
 646
 647         /* We cannot fulfill this request right now, try again later
 648          * please! */
 649         if (m->state == MOUNT_UNMOUNTING ||
 650             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 651             m->state == MOUNT_UNMOUNTING_SIGKILL)
 652                 return -EAGAIN;
 653
 654         /* Already on it! */
 655         if (m->state == MOUNT_MOUNTING ||
 656             m->state == MOUNT_MOUNTING_SIGTERM ||
 657             m->state == MOUNT_MOUNTING_SIGKILL)
 658                 return 0;
 659
 660         assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTAINANCE);
 661
 662         m->failure = false;
 663
 664         mount_enter_mounting(m, true);
 665         return 0;
 666 }
 667
 668 static int mount_stop(Unit *u) {
 669         Mount *m = MOUNT(u);
 670
 671         assert(m);
 672
 673         /* Cann't do this right now. */
 674         if (m->state == MOUNT_MOUNTING ||
 675             m->state == MOUNT_MOUNTING_DONE ||
 676             m->state == MOUNT_MOUNTING_SIGTERM ||
 677             m->state == MOUNT_MOUNTING_SIGKILL ||
 678             m->state == MOUNT_REMOUNTING ||
 679             m->state == MOUNT_REMOUNTING_SIGTERM ||
 680             m->state == MOUNT_REMOUNTING_SIGKILL)
 681                 return -EAGAIN;
 682
 683         /* Already on it */
 684         if (m->state == MOUNT_UNMOUNTING ||
 685             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 686             m->state == MOUNT_UNMOUNTING_SIGTERM)
 687                 return 0;
 688
 689         assert(m->state == MOUNT_MOUNTED);
 690
 691         mount_enter_unmounting(m, true);
 692         return 0;
 693 }
 694
 695 static int mount_reload(Unit *u) {
 696         Mount *m = MOUNT(u);
 697
 698         assert(m);
 699
 700         if (m->state == MOUNT_MOUNTING_DONE)
 701                 return -EAGAIN;
 702
 703         assert(m->state == MOUNT_MOUNTED);
 704
 705         mount_enter_remounting(m, true);
 706         return 0;
 707 }
 708
 709 static UnitActiveState mount_active_state(Unit *u) {
 710         assert(u);
 711
 712         return state_translation_table[MOUNT(u)->state];
 713 }
 714
 715 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 716         Mount *m = MOUNT(u);
 717         bool success;
 718
 719         assert(m);
 720         assert(pid >= 0);
 721
 722         success = code == CLD_EXITED && status == 0;
 723         m->failure = m->failure || !success;
 724
 725         assert(m->control_pid == pid);
 726         assert(m->control_command);
 727
 728         exec_status_fill(&m->control_command->exec_status, pid, code, status);
 729         m->control_pid = 0;
 730
 731         log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 732
 733         /* Note that mount(8) returning and the kernel sending us a
 734          * mount table change event might happen out-of-order. If an
 735          * operation succeed we assume the kernel will follow soon too
 736          * and already change into the resulting state.  If it fails
 737          * we check if the kernel still knows about the mount. and
 738          * change state accordingly. */
 739
 740         switch (m->state) {
 741
 742         case MOUNT_MOUNTING:
 743         case MOUNT_MOUNTING_DONE:
 744         case MOUNT_MOUNTING_SIGKILL:
 745         case MOUNT_MOUNTING_SIGTERM:
 746         case MOUNT_REMOUNTING:
 747         case MOUNT_REMOUNTING_SIGKILL:
 748         case MOUNT_REMOUNTING_SIGTERM:
 749
 750                 if (success && m->from_proc_self_mountinfo)
 751                         mount_enter_mounted(m, true);
 752                 else if (m->from_proc_self_mountinfo)
 753                         mount_enter_mounted(m, false);
 754                 else
 755                         mount_enter_dead(m, false);
 756                 break;
 757
 758         case MOUNT_UNMOUNTING:
 759         case MOUNT_UNMOUNTING_SIGKILL:
 760         case MOUNT_UNMOUNTING_SIGTERM:
 761
 762                 if (success)
 763                         mount_enter_dead(m, true);
 764                 else if (m->from_proc_self_mountinfo)
 765                         mount_enter_mounted(m, false);
 766                 else
 767                         mount_enter_dead(m, false);
 768                 break;
 769
 770         default:
 771                 assert_not_reached("Uh, control process died at wrong time.");
 772         }
 773 }
 774
 775 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 776         Mount *m = MOUNT(u);
 777
 778         assert(m);
 779         assert(elapsed == 1);
 780         assert(w == &m->timer_watch);
 781
 782         switch (m->state) {
 783
 784         case MOUNT_MOUNTING:
 785         case MOUNT_MOUNTING_DONE:
 786                 log_warning("%s mounting timed out. Stopping.", unit_id(u));
 787                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
 788                 break;
 789
 790         case MOUNT_REMOUNTING:
 791                 log_warning("%s remounting timed out. Stopping.", unit_id(u));
 792                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
 793                 break;
 794
 795         case MOUNT_UNMOUNTING:
 796                 log_warning("%s unmounting timed out. Stopping.", unit_id(u));
 797                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
 798                 break;
 799
 800         case MOUNT_MOUNTING_SIGTERM:
 801                 log_warning("%s mounting timed out. Killing.", unit_id(u));
 802                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
 803                 break;
 804
 805         case MOUNT_REMOUNTING_SIGTERM:
 806                 log_warning("%s remounting timed out. Killing.", unit_id(u));
 807                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
 808                 break;
 809
 810         case MOUNT_UNMOUNTING_SIGTERM:
 811                 log_warning("%s unmounting timed out. Killing.", unit_id(u));
 812                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
 813                 break;
 814
 815         case MOUNT_MOUNTING_SIGKILL:
 816         case MOUNT_REMOUNTING_SIGKILL:
 817         case MOUNT_UNMOUNTING_SIGKILL:
 818                 log_warning("%s mount process still around after SIGKILL. Ignoring.", unit_id(u));
 819
 820                 if (m->from_proc_self_mountinfo)
 821                         mount_enter_mounted(m, false);
 822                 else
 823                         mount_enter_dead(m, false);
 824                 break;
 825
 826         default:
 827                 assert_not_reached("Timeout at wrong time.");
 828         }
 829 }
 830
 831 static int mount_add_one(
 832                 Manager *m,
 833                 const char *what,
 834                 const char *where,
 835                 const char *options,
 836                 const char *fstype,
 837                 bool from_proc_self_mountinfo,
 838                 bool set_flags) {
 839         int r;
 840         Unit *u;
 841         bool delete;
 842         char *e, *w = NULL, *o = NULL, *f = NULL;
 843         MountParameters *mp;
 844
 845         assert(m);
 846         assert(what);
 847         assert(where);
 848         assert(options);
 849         assert(fstype);
 850
 851         assert(!set_flags || from_proc_self_mountinfo);
 852
 853         /* Ignore API mount points. They should never be referenced in
 854          * dependencies ever. */
 855         if (mount_point_is_api(where))
 856                 return 0;
 857
 858         /* probably some kind of swap, which we don't cover for now */
 859         if (where[0] != '/')
 860                 return 0;
 861
 862         if (streq(where, "/"))
 863                 e = strdup("-.mount");
 864         else
 865                 e = unit_name_escape_path(where+1, ".mount");
 866
 867         if (!e)
 868                 return -ENOMEM;
 869
 870         if (!(u = manager_get_unit(m, e))) {
 871                 delete = true;
 872
 873                 if (!(u = unit_new(m))) {
 874                         free(e);
 875                         return -ENOMEM;
 876                 }
 877
 878                 r = unit_add_name(u, e);
 879                 free(e);
 880
 881                 if (r < 0)
 882                         goto fail;
 883
 884                 if (!(MOUNT(u)->where = strdup(where))) {
 885                             r = -ENOMEM;
 886                             goto fail;
 887                     }
 888
 889                 if ((r = unit_set_description(u, where)) < 0)
 890                         goto fail;
 891
 892                 unit_add_to_load_queue(u);
 893         } else {
 894                 delete = false;
 895                 free(e);
 896         }
 897
 898         if (!(w = strdup(what)) ||
 899             !(o = strdup(options)) ||
 900             !(f = strdup(fstype))) {
 901                 r = -ENOMEM;
 902                 goto fail;
 903         }
 904
 905         if (from_proc_self_mountinfo) {
 906                 mp = &MOUNT(u)->parameters_proc_self_mountinfo;
 907
 908                 if (set_flags) {
 909                         MOUNT(u)->is_mounted = true;
 910                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
 911                         MOUNT(u)->just_changed = !streq_ptr(MOUNT(u)->parameters_proc_self_mountinfo.options, o);
 912                 }
 913
 914                 MOUNT(u)->from_proc_self_mountinfo = true;
 915
 916         } else {
 917                 mp = &MOUNT(u)->parameters_etc_fstab;
 918
 919                 MOUNT(u)->from_etc_fstab = true;
 920         }
 921
 922         free(mp->what);
 923         mp->what = w;
 924
 925         free(mp->options);
 926         mp->options = o;
 927
 928         free(mp->fstype);
 929         mp->fstype = f;
 930
 931         unit_add_to_dbus_queue(u);
 932
 933         return 0;
 934
 935 fail:
 936         free(w);
 937         free(o);
 938         free(f);
 939
 940         if (delete && u)
 941                 unit_free(u);
 942
 943         return 0;
 944 }
 945
 946 static char *fstab_node_to_udev_node(char *p) {
 947         char *dn, *t;
 948         int r;
 949
 950         /* FIXME: to follow udev's logic 100% we need to leave valid
 951          * UTF8 chars unescaped */
 952
 953         if (startswith(p, "LABEL=")) {
 954
 955                 if (!(t = xescape(p+6, "/ ")))
 956                         return NULL;
 957
 958                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
 959                 free(t);
 960
 961                 if (r < 0)
 962                         return NULL;
 963
 964                 return dn;
 965         }
 966
 967         if (startswith(p, "UUID=")) {
 968
 969                 if (!(t = xescape(p+5, "/ ")))
 970                         return NULL;
 971
 972                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
 973                 free(t);
 974
 975                 if (r < 0)
 976                         return NULL;
 977
 978                 return dn;
 979         }
 980
 981         return strdup(p);
 982 }
 983
 984 static int mount_load_etc_fstab(Manager *m) {
 985         FILE *f;
 986         int r;
 987         struct mntent* me;
 988
 989         assert(m);
 990
 991         errno = 0;
 992         if (!(f = setmntent("/etc/fstab", "r")))
 993                 return -errno;
 994
 995         while ((me = getmntent(f))) {
 996                 char *where, *what;
 997
 998                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
 999                         r = -ENOMEM;
1000                         goto finish;
1001                 }
1002
1003                 if (!(where = strdup(me->mnt_dir))) {
1004                         free(what);
1005                         r = -ENOMEM;
1006                         goto finish;
1007                 }
1008
1009                 if (what[0] == '/')
1010                         path_kill_slashes(what);
1011
1012                 if (where[0] == '/')
1013                         path_kill_slashes(where);
1014
1015                 r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1016                 free(what);
1017                 free(where);
1018
1019                 if (r < 0)
1020                         goto finish;
1021         }
1022
1023         r = 0;
1024 finish:
1025
1026         endmntent(f);
1027         return r;
1028 }
1029
1030 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1031         int r;
1032         char *device, *path, *options, *fstype, *d, *p;
1033
1034         assert(m);
1035
1036         rewind(m->proc_self_mountinfo);
1037
1038         for (;;) {
1039                 int k;
1040
1041                 device = path = options = fstype = d = p = NULL;
1042
1043                 if ((k = fscanf(m->proc_self_mountinfo,
1044                                 "%*s "       /* (1) mount id */
1045                                 "%*s "       /* (2) parent id */
1046                                 "%*s "       /* (3) major:minor */
1047                                 "%*s "       /* (4) root */
1048                                 "%ms "       /* (5) mount point */
1049                                 "%ms"        /* (6) mount options */
1050                                 "%*[^-]"     /* (7) optional fields */
1051                                 "- "         /* (8) seperator */
1052                                 "%ms "       /* (9) file system type */
1053                                 "%ms"        /* (10) mount source */
1054                                 "%*[^\n]",   /* some rubbish at the end */
1055                                 &path,
1056                                 &options,
1057                                 &fstype,
1058                                 &device)) != 4) {
1059
1060                         if (k == EOF)
1061                                 break;
1062
1063                         r = -EBADMSG;
1064                         goto finish;
1065                 }
1066
1067                 if (!(d = cunescape(device)) ||
1068                     !(p = cunescape(path))) {
1069                         r = -ENOMEM;
1070                         goto finish;
1071                 }
1072
1073                 if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0)
1074                         goto finish;
1075
1076                 free(device);
1077                 free(path);
1078                 free(options);
1079                 free(fstype);
1080                 free(d);
1081                 free(p);
1082         }
1083
1084         r = 0;
1085
1086 finish:
1087         free(device);
1088         free(path);
1089         free(options);
1090         free(fstype);
1091         free(d);
1092         free(p);
1093
1094         return r;
1095 }
1096
1097 static void mount_shutdown(Manager *m) {
1098         assert(m);
1099
1100         if (m->proc_self_mountinfo)
1101                 fclose(m->proc_self_mountinfo);
1102 }
1103
1104 static int mount_enumerate(Manager *m) {
1105         int r;
1106         struct epoll_event ev;
1107         assert(m);
1108
1109         if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
1110                 return -errno;
1111
1112         m->mount_watch.type = WATCH_MOUNT;
1113         m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1114
1115         zero(ev);
1116         ev.events = EPOLLERR;
1117         ev.data.ptr = &m->mount_watch;
1118
1119         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1120                 return -errno;
1121
1122         if ((r = mount_load_etc_fstab(m)) < 0)
1123                 goto fail;
1124
1125         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1126                 goto fail;
1127
1128         return 0;
1129
1130 fail:
1131         mount_shutdown(m);
1132         return r;
1133 }
1134
1135 void mount_fd_event(Manager *m, int events) {
1136         Meta *meta;
1137         int r;
1138
1139         assert(m);
1140         assert(events == EPOLLERR);
1141
1142         /* The manager calls this for every fd event happening on the
1143          * /proc/self/mountinfo file, which informs us about mounting
1144          * table changes */
1145
1146         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1147                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
1148
1149                 /* Reset flags, just in case, for later calls */
1150                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1151                         Mount *mount = (Mount*) meta;
1152
1153                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1154                 }
1155
1156                 return;
1157         }
1158
1159         manager_dispatch_load_queue(m);
1160
1161         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1162                 Mount *mount = (Mount*) meta;
1163
1164                 if (!mount->is_mounted) {
1165                         /* This has just been unmounted. */
1166
1167                         mount->from_proc_self_mountinfo = false;
1168
1169                         switch (mount->state) {
1170
1171                         case MOUNT_MOUNTED:
1172                                 mount_enter_dead(mount, true);
1173                                 break;
1174
1175                         default:
1176                                 mount_set_state(mount, mount->state);
1177                                 break;
1178
1179                         }
1180
1181                 } else if (mount->just_mounted || mount->just_changed) {
1182
1183                         /* New or changed entrymount */
1184
1185                         switch (mount->state) {
1186
1187                         case MOUNT_DEAD:
1188                         case MOUNT_MAINTAINANCE:
1189                                 mount_enter_mounted(mount, true);
1190                                 break;
1191
1192                         case MOUNT_MOUNTING:
1193                                 mount_enter_mounting_done(mount, true);
1194                                 break;
1195
1196                         default:
1197                                 /* Nothing really changed, but let's
1198                                  * issue an notification call
1199                                  * nonetheless, in case somebody is
1200                                  * waiting for this. (e.g. file system
1201                                  * ro/rw remounts.) */
1202                                 mount_set_state(mount, mount->state);
1203                                 break;
1204                         }
1205                 }
1206
1207                 /* Reset the flags for later calls */
1208                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1209         }
1210 }
1211
1212 int mount_path_is_mounted(Manager *m, const char* path) {
1213         char *t;
1214         int r;
1215
1216         assert(m);
1217         assert(path);
1218
1219         if (path[0] != '/')
1220                 return 1;
1221
1222         if (!(t = strdup(path)))
1223                 return -ENOMEM;
1224
1225         path_kill_slashes(t);
1226
1227         for (;;) {
1228                 char *e, *slash;
1229                 Unit *u;
1230
1231                 if (!(e = unit_name_escape_path(t+1, ".mount"))) {
1232                         r = -ENOMEM;
1233                         goto finish;
1234                 }
1235
1236                 u = manager_get_unit(m, e);
1237                 free(e);
1238
1239                 if (u &&
1240                     (MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) &&
1241                     MOUNT(u)->state != MOUNT_MOUNTED) {
1242                         r = 0;
1243                         goto finish;
1244                 }
1245
1246                 assert_se(slash = strrchr(t, '/'));
1247
1248                 if (slash == t) {
1249                         r = 1;
1250                         goto finish;
1251                 }
1252
1253                 *slash = 0;
1254         }
1255
1256         r = 1;
1257
1258 finish:
1259         free(t);
1260         return r;
1261 }
1262
1263 const UnitVTable mount_vtable = {
1264         .suffix = ".mount",
1265
1266         .no_alias = true,
1267
1268         .init = mount_init,
1269         .load = mount_load,
1270         .done = mount_done,
1271
1272         .coldplug = mount_coldplug,
1273
1274         .dump = mount_dump,
1275
1276         .start = mount_start,
1277         .stop = mount_stop,
1278         .reload = mount_reload,
1279
1280         .active_state = mount_active_state,
1281
1282         .sigchld_event = mount_sigchld_event,
1283         .timer_event = mount_timer_event,
1284
1285         .enumerate = mount_enumerate,
1286         .shutdown = mount_shutdown
1287 };