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