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         bool noauto;
 248         bool handle;
 249
 250         assert(m);
 251
 252         if (m->from_fragment)
 253                 p = &m->parameters_fragment;
 254         else if (m->from_etc_fstab)
 255                 p = &m->parameters_etc_fstab;
 256         else
 257                 return 0;
 258
 259         noauto = mount_test_option(p->options, MNTOPT_NOAUTO);
 260         handle = mount_test_option(p->options, "comment=systemd.mount");
 261
 262         if (noauto && !handle)
 263                 return 0;
 264
 265         if (mount_test_option(p->options, "_netdev") ||
 266             fstype_is_network(p->fstype))
 267                 target = SPECIAL_REMOTE_FS_TARGET;
 268         else
 269                 target = SPECIAL_LOCAL_FS_TARGET;
 270
 271         if ((r = manager_load_unit(UNIT(m)->meta.manager, target, &u)) < 0)
 272                 return r;
 273
 274         if (handle)
 275                 if ((r = unit_add_dependency(u, UNIT_WANTS, UNIT(m))) < 0)
 276                         return r;
 277
 278         return unit_add_dependency(UNIT(m), UNIT_BEFORE, u);
 279 }
 280
 281 static int mount_load(Unit *u) {
 282         Mount *m = MOUNT(u);
 283         int r;
 284
 285         assert(u);
 286         assert(u->meta.load_state == UNIT_STUB);
 287
 288         if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
 289                 return r;
 290
 291         /* This is a new unit? Then let's add in some extras */
 292         if (u->meta.load_state == UNIT_LOADED) {
 293
 294                 /* Minor validity checking */
 295                 if ((m->parameters_fragment.options || m->parameters_fragment.fstype) && !m->parameters_fragment.what)
 296                         return -EBADMSG;
 297
 298                 if (m->parameters_fragment.what)
 299                         m->from_fragment = true;
 300
 301                 if ((r = mount_add_node_links(MOUNT(u))) < 0)
 302                         return r;
 303
 304                 if ((r = mount_add_path_links(MOUNT(u))) < 0)
 305                         return r;
 306
 307                 if ((r = mount_add_target_links(MOUNT(u))) < 0)
 308                         return r;
 309
 310                 if ((r = unit_add_default_cgroup(u)) < 0)
 311                         return r;
 312         }
 313
 314         return 0;
 315 }
 316
 317 static void mount_set_state(Mount *m, MountState state) {
 318         MountState old_state;
 319         assert(m);
 320
 321         old_state = m->state;
 322         m->state = state;
 323
 324         if (state != MOUNT_MOUNTING &&
 325             state != MOUNT_MOUNTING_DONE &&
 326             state != MOUNT_REMOUNTING &&
 327             state != MOUNT_UNMOUNTING &&
 328             state != MOUNT_MOUNTING_SIGTERM &&
 329             state != MOUNT_MOUNTING_SIGKILL &&
 330             state != MOUNT_UNMOUNTING_SIGTERM &&
 331             state != MOUNT_UNMOUNTING_SIGKILL &&
 332             state != MOUNT_REMOUNTING_SIGTERM &&
 333             state != MOUNT_REMOUNTING_SIGKILL) {
 334                 unit_unwatch_timer(UNIT(m), &m->timer_watch);
 335                 service_unwatch_control_pid(m);
 336                 m->control_command = NULL;
 337         }
 338
 339         if (state != old_state)
 340                 log_debug("%s changed %s → %s", unit_id(UNIT(m)), state_string_table[old_state], state_string_table[state]);
 341
 342         unit_notify(UNIT(m), state_translation_table[old_state], state_translation_table[state]);
 343 }
 344
 345 static int mount_coldplug(Unit *u) {
 346         Mount *m = MOUNT(u);
 347
 348         assert(m);
 349         assert(m->state == MOUNT_DEAD);
 350
 351         if (m->from_proc_self_mountinfo)
 352                 mount_set_state(m, MOUNT_MOUNTED);
 353
 354         return 0;
 355 }
 356
 357 static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
 358         pid_t pid;
 359         int r;
 360
 361         assert(m);
 362         assert(c);
 363         assert(_pid);
 364
 365         if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 366                 goto fail;
 367
 368         if ((r = exec_spawn(c,
 369                             &m->exec_context,
 370                             NULL, 0,
 371                             true,
 372                             true,
 373                             UNIT(m)->meta.manager->confirm_spawn,
 374                             UNIT(m)->meta.cgroup_bondings,
 375                             &pid)) < 0)
 376                 goto fail;
 377
 378         if ((r = unit_watch_pid(UNIT(m), pid)) < 0)
 379                 /* FIXME: we need to do something here */
 380                 goto fail;
 381
 382         *_pid = pid;
 383
 384         return 0;
 385
 386 fail:
 387         unit_unwatch_timer(UNIT(m), &m->timer_watch);
 388
 389         return r;
 390 }
 391
 392 static void mount_dump(Unit *u, FILE *f, const char *prefix) {
 393         Mount *m = MOUNT(u);
 394         MountParameters *p;
 395
 396         assert(m);
 397         assert(f);
 398
 399         if (m->from_proc_self_mountinfo)
 400                 p = &m->parameters_proc_self_mountinfo;
 401         else if (m->from_fragment)
 402                 p = &m->parameters_fragment;
 403         else
 404                 p = &m->parameters_etc_fstab;
 405
 406         fprintf(f,
 407                 "%sMount State: %s\n"
 408                 "%sWhere: %s\n"
 409                 "%sWhat: %s\n"
 410                 "%sFile System Type: %s\n"
 411                 "%sOptions: %s\n"
 412                 "%sFrom /etc/fstab: %s\n"
 413                 "%sFrom /proc/self/mountinfo: %s\n"
 414                 "%sFrom fragment: %s\n"
 415                 "%sKillMode: %s\n",
 416                 prefix, state_string_table[m->state],
 417                 prefix, m->where,
 418                 prefix, strna(p->what),
 419                 prefix, strna(p->fstype),
 420                 prefix, strna(p->options),
 421                 prefix, yes_no(m->from_etc_fstab),
 422                 prefix, yes_no(m->from_proc_self_mountinfo),
 423                 prefix, yes_no(m->from_fragment),
 424                 prefix, kill_mode_to_string(m->kill_mode));
 425
 426         if (m->control_pid > 0)
 427                 fprintf(f,
 428                         "%sControl PID: %llu\n",
 429                         prefix, (unsigned long long) m->control_pid);
 430
 431         exec_context_dump(&m->exec_context, f, prefix);
 432 }
 433
 434 static void mount_enter_dead(Mount *m, bool success) {
 435         assert(m);
 436
 437         if (!success)
 438                 m->failure = true;
 439
 440         mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD);
 441 }
 442
 443 static void mount_enter_mounted(Mount *m, bool success) {
 444         assert(m);
 445
 446         if (!success)
 447                 m->failure = true;
 448
 449         mount_set_state(m, MOUNT_MOUNTED);
 450 }
 451
 452 static void mount_enter_signal(Mount *m, MountState state, bool success) {
 453         int r;
 454         bool sent = false;
 455
 456         assert(m);
 457
 458         if (!success)
 459                 m->failure = true;
 460
 461         if (m->kill_mode != KILL_NONE) {
 462                 int sig = (state == MOUNT_MOUNTING_SIGTERM ||
 463                            state == MOUNT_UNMOUNTING_SIGTERM ||
 464                            state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
 465
 466                 if (m->kill_mode == KILL_CONTROL_GROUP) {
 467
 468                         if ((r = cgroup_bonding_kill_list(UNIT(m)->meta.cgroup_bondings, sig)) < 0) {
 469                                 if (r != -EAGAIN && r != -ESRCH)
 470                                         goto fail;
 471                         } else
 472                                 sent = true;
 473                 }
 474
 475                 if (!sent && m->control_pid > 0)
 476                         if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) {
 477                                 r = -errno;
 478                                 goto fail;
 479                         }
 480         }
 481
 482         if (sent) {
 483                 if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
 484                         goto fail;
 485
 486                 mount_set_state(m, state);
 487         } else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 488                 mount_enter_mounted(m, true);
 489         else
 490                 mount_enter_dead(m, true);
 491
 492         return;
 493
 494 fail:
 495         log_warning("%s failed to kill processes: %s", unit_id(UNIT(m)), strerror(-r));
 496
 497         if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
 498                 mount_enter_mounted(m, false);
 499         else
 500                 mount_enter_dead(m, false);
 501 }
 502
 503 static void mount_enter_unmounting(Mount *m, bool success) {
 504         ExecCommand *c;
 505         int r;
 506
 507         assert(m);
 508
 509         if (!success)
 510                 m->failure = true;
 511
 512         m->control_command = c = m->exec_command + MOUNT_EXEC_UNMOUNT;
 513
 514         if ((r = exec_command_set(
 515                              c,
 516                              "/bin/umount",
 517                              m->where,
 518                              NULL)) < 0)
 519                 goto fail;
 520
 521         service_unwatch_control_pid(m);
 522
 523         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 524                 goto fail;
 525
 526         mount_set_state(m, MOUNT_UNMOUNTING);
 527
 528         return;
 529
 530 fail:
 531         log_warning("%s failed to run umount exectuable: %s", unit_id(UNIT(m)), strerror(-r));
 532         mount_enter_mounted(m, false);
 533 }
 534
 535 static void mount_enter_mounting(Mount *m, bool success) {
 536         ExecCommand *c;
 537         int r;
 538
 539         assert(m);
 540
 541         if (!success)
 542                 m->failure = true;
 543
 544         m->control_command = c = m->exec_command + MOUNT_EXEC_MOUNT;
 545
 546         if (m->from_fragment)
 547                 r = exec_command_set(
 548                                 c,
 549                                 "/bin/mount",
 550                                 m->parameters_fragment.what,
 551                                 m->where,
 552                                 "-t", m->parameters_fragment.fstype,
 553                                 "-o", m->parameters_fragment.options,
 554                                 NULL);
 555         else if (m->from_etc_fstab)
 556                 r = exec_command_set(
 557                                 c,
 558                                 "/bin/mount",
 559                                 m->where,
 560                                 NULL);
 561         else
 562                 r = -ENOENT;
 563
 564         if (r < 0)
 565                 goto fail;
 566
 567         service_unwatch_control_pid(m);
 568
 569         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 570                 goto fail;
 571
 572         mount_set_state(m, MOUNT_MOUNTING);
 573
 574         return;
 575
 576 fail:
 577         log_warning("%s failed to run mount exectuable: %s", unit_id(UNIT(m)), strerror(-r));
 578         mount_enter_dead(m, false);
 579 }
 580
 581 static void mount_enter_mounting_done(Mount *m, bool success) {
 582         assert(m);
 583
 584         if (!success)
 585                 m->failure = true;
 586
 587         mount_set_state(m, MOUNT_MOUNTING_DONE);
 588 }
 589
 590 static void mount_enter_remounting(Mount *m, bool success) {
 591         ExecCommand *c;
 592         int r;
 593
 594         assert(m);
 595
 596         if (!success)
 597                 m->failure = true;
 598
 599         m->control_command = c = m->exec_command + MOUNT_EXEC_REMOUNT;
 600
 601         if (m->from_fragment) {
 602                 char *buf = NULL;
 603                 const char *o;
 604
 605                 if (m->parameters_fragment.options) {
 606                         if (!(buf = strappend("remount,", m->parameters_fragment.options))) {
 607                                 r = -ENOMEM;
 608                                 goto fail;
 609                         }
 610
 611                         o = buf;
 612                 } else
 613                         o = "remount";
 614
 615                 r = exec_command_set(
 616                                 c,
 617                                 "/bin/mount",
 618                                 m->parameters_fragment.what,
 619                                 m->where,
 620                                 "-t", m->parameters_fragment.fstype,
 621                                 "-o", o,
 622                                 NULL);
 623
 624                 free(buf);
 625         } else if (m->from_etc_fstab)
 626                 r = exec_command_set(
 627                                 c,
 628                                 "/bin/mount",
 629                                 m->where,
 630                                 "-o", "remount",
 631                                 NULL);
 632         else
 633                 r = -ENOENT;
 634
 635         if (r < 0) {
 636                 r = -ENOMEM;
 637                 goto fail;
 638         }
 639
 640         service_unwatch_control_pid(m);
 641
 642         if ((r = mount_spawn(m, c, &m->control_pid)) < 0)
 643                 goto fail;
 644
 645         mount_set_state(m, MOUNT_REMOUNTING);
 646
 647         return;
 648
 649 fail:
 650         mount_enter_mounted(m, false);
 651 }
 652
 653 static int mount_start(Unit *u) {
 654         Mount *m = MOUNT(u);
 655
 656         assert(m);
 657
 658         /* We cannot fulfill this request right now, try again later
 659          * please! */
 660         if (m->state == MOUNT_UNMOUNTING ||
 661             m->state == MOUNT_UNMOUNTING_SIGTERM ||
 662             m->state == MOUNT_UNMOUNTING_SIGKILL)
 663                 return -EAGAIN;
 664
 665         /* Already on it! */
 666         if (m->state == MOUNT_MOUNTING ||
 667             m->state == MOUNT_MOUNTING_SIGTERM ||
 668             m->state == MOUNT_MOUNTING_SIGKILL)
 669                 return 0;
 670
 671         assert(m->state == MOUNT_DEAD || m->state == MOUNT_MAINTAINANCE);
 672
 673         m->failure = false;
 674
 675         mount_enter_mounting(m, true);
 676         return 0;
 677 }
 678
 679 static int mount_stop(Unit *u) {
 680         Mount *m = MOUNT(u);
 681
 682         assert(m);
 683
 684         /* Cann't do this right now. */
 685         if (m->state == MOUNT_MOUNTING ||
 686             m->state == MOUNT_MOUNTING_DONE ||
 687             m->state == MOUNT_MOUNTING_SIGTERM ||
 688             m->state == MOUNT_MOUNTING_SIGKILL ||
 689             m->state == MOUNT_REMOUNTING ||
 690             m->state == MOUNT_REMOUNTING_SIGTERM ||
 691             m->state == MOUNT_REMOUNTING_SIGKILL)
 692                 return -EAGAIN;
 693
 694         /* Already on it */
 695         if (m->state == MOUNT_UNMOUNTING ||
 696             m->state == MOUNT_UNMOUNTING_SIGKILL ||
 697             m->state == MOUNT_UNMOUNTING_SIGTERM)
 698                 return 0;
 699
 700         assert(m->state == MOUNT_MOUNTED);
 701
 702         mount_enter_unmounting(m, true);
 703         return 0;
 704 }
 705
 706 static int mount_reload(Unit *u) {
 707         Mount *m = MOUNT(u);
 708
 709         assert(m);
 710
 711         if (m->state == MOUNT_MOUNTING_DONE)
 712                 return -EAGAIN;
 713
 714         assert(m->state == MOUNT_MOUNTED);
 715
 716         mount_enter_remounting(m, true);
 717         return 0;
 718 }
 719
 720 static UnitActiveState mount_active_state(Unit *u) {
 721         assert(u);
 722
 723         return state_translation_table[MOUNT(u)->state];
 724 }
 725
 726 static const char *mount_sub_state_to_string(Unit *u) {
 727         assert(u);
 728
 729         return state_string_table[MOUNT(u)->state];
 730 }
 731
 732 static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 733         Mount *m = MOUNT(u);
 734         bool success;
 735
 736         assert(m);
 737         assert(pid >= 0);
 738
 739         success = code == CLD_EXITED && status == 0;
 740         m->failure = m->failure || !success;
 741
 742         assert(m->control_pid == pid);
 743         assert(m->control_command);
 744
 745         exec_status_fill(&m->control_command->exec_status, pid, code, status);
 746         m->control_pid = 0;
 747
 748         log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 749
 750         /* Note that mount(8) returning and the kernel sending us a
 751          * mount table change event might happen out-of-order. If an
 752          * operation succeed we assume the kernel will follow soon too
 753          * and already change into the resulting state.  If it fails
 754          * we check if the kernel still knows about the mount. and
 755          * change state accordingly. */
 756
 757         switch (m->state) {
 758
 759         case MOUNT_MOUNTING:
 760         case MOUNT_MOUNTING_DONE:
 761         case MOUNT_MOUNTING_SIGKILL:
 762         case MOUNT_MOUNTING_SIGTERM:
 763         case MOUNT_REMOUNTING:
 764         case MOUNT_REMOUNTING_SIGKILL:
 765         case MOUNT_REMOUNTING_SIGTERM:
 766
 767                 if (success && m->from_proc_self_mountinfo)
 768                         mount_enter_mounted(m, true);
 769                 else if (m->from_proc_self_mountinfo)
 770                         mount_enter_mounted(m, false);
 771                 else
 772                         mount_enter_dead(m, false);
 773                 break;
 774
 775         case MOUNT_UNMOUNTING:
 776         case MOUNT_UNMOUNTING_SIGKILL:
 777         case MOUNT_UNMOUNTING_SIGTERM:
 778
 779                 if (success)
 780                         mount_enter_dead(m, true);
 781                 else if (m->from_proc_self_mountinfo)
 782                         mount_enter_mounted(m, false);
 783                 else
 784                         mount_enter_dead(m, false);
 785                 break;
 786
 787         default:
 788                 assert_not_reached("Uh, control process died at wrong time.");
 789         }
 790 }
 791
 792 static void mount_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 793         Mount *m = MOUNT(u);
 794
 795         assert(m);
 796         assert(elapsed == 1);
 797         assert(w == &m->timer_watch);
 798
 799         switch (m->state) {
 800
 801         case MOUNT_MOUNTING:
 802         case MOUNT_MOUNTING_DONE:
 803                 log_warning("%s mounting timed out. Stopping.", unit_id(u));
 804                 mount_enter_signal(m, MOUNT_MOUNTING_SIGTERM, false);
 805                 break;
 806
 807         case MOUNT_REMOUNTING:
 808                 log_warning("%s remounting timed out. Stopping.", unit_id(u));
 809                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGTERM, false);
 810                 break;
 811
 812         case MOUNT_UNMOUNTING:
 813                 log_warning("%s unmounting timed out. Stopping.", unit_id(u));
 814                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGTERM, false);
 815                 break;
 816
 817         case MOUNT_MOUNTING_SIGTERM:
 818                 log_warning("%s mounting timed out. Killing.", unit_id(u));
 819                 mount_enter_signal(m, MOUNT_MOUNTING_SIGKILL, false);
 820                 break;
 821
 822         case MOUNT_REMOUNTING_SIGTERM:
 823                 log_warning("%s remounting timed out. Killing.", unit_id(u));
 824                 mount_enter_signal(m, MOUNT_REMOUNTING_SIGKILL, false);
 825                 break;
 826
 827         case MOUNT_UNMOUNTING_SIGTERM:
 828                 log_warning("%s unmounting timed out. Killing.", unit_id(u));
 829                 mount_enter_signal(m, MOUNT_UNMOUNTING_SIGKILL, false);
 830                 break;
 831
 832         case MOUNT_MOUNTING_SIGKILL:
 833         case MOUNT_REMOUNTING_SIGKILL:
 834         case MOUNT_UNMOUNTING_SIGKILL:
 835                 log_warning("%s mount process still around after SIGKILL. Ignoring.", unit_id(u));
 836
 837                 if (m->from_proc_self_mountinfo)
 838                         mount_enter_mounted(m, false);
 839                 else
 840                         mount_enter_dead(m, false);
 841                 break;
 842
 843         default:
 844                 assert_not_reached("Timeout at wrong time.");
 845         }
 846 }
 847
 848 static int mount_add_one(
 849                 Manager *m,
 850                 const char *what,
 851                 const char *where,
 852                 const char *options,
 853                 const char *fstype,
 854                 bool from_proc_self_mountinfo,
 855                 bool set_flags) {
 856         int r;
 857         Unit *u;
 858         bool delete;
 859         char *e, *w = NULL, *o = NULL, *f = NULL;
 860         MountParameters *mp;
 861
 862         assert(m);
 863         assert(what);
 864         assert(where);
 865         assert(options);
 866         assert(fstype);
 867
 868         assert(!set_flags || from_proc_self_mountinfo);
 869
 870         /* Ignore API mount points. They should never be referenced in
 871          * dependencies ever. */
 872         if (mount_point_is_api(where))
 873                 return 0;
 874
 875         /* probably some kind of swap, which we don't cover for now */
 876         if (where[0] != '/')
 877                 return 0;
 878
 879         if (streq(where, "/"))
 880                 e = strdup("-.mount");
 881         else
 882                 e = unit_name_escape_path(where+1, ".mount");
 883
 884         if (!e)
 885                 return -ENOMEM;
 886
 887         if (!(u = manager_get_unit(m, e))) {
 888                 delete = true;
 889
 890                 if (!(u = unit_new(m))) {
 891                         free(e);
 892                         return -ENOMEM;
 893                 }
 894
 895                 r = unit_add_name(u, e);
 896                 free(e);
 897
 898                 if (r < 0)
 899                         goto fail;
 900
 901                 if (!(MOUNT(u)->where = strdup(where))) {
 902                             r = -ENOMEM;
 903                             goto fail;
 904                     }
 905
 906                 if ((r = unit_set_description(u, where)) < 0)
 907                         goto fail;
 908
 909                 unit_add_to_load_queue(u);
 910         } else {
 911                 delete = false;
 912                 free(e);
 913         }
 914
 915         if (!(w = strdup(what)) ||
 916             !(o = strdup(options)) ||
 917             !(f = strdup(fstype))) {
 918                 r = -ENOMEM;
 919                 goto fail;
 920         }
 921
 922         if (from_proc_self_mountinfo) {
 923                 mp = &MOUNT(u)->parameters_proc_self_mountinfo;
 924
 925                 if (set_flags) {
 926                         MOUNT(u)->is_mounted = true;
 927                         MOUNT(u)->just_mounted = !MOUNT(u)->from_proc_self_mountinfo;
 928                         MOUNT(u)->just_changed = !streq_ptr(MOUNT(u)->parameters_proc_self_mountinfo.options, o);
 929                 }
 930
 931                 MOUNT(u)->from_proc_self_mountinfo = true;
 932
 933         } else {
 934                 mp = &MOUNT(u)->parameters_etc_fstab;
 935
 936                 MOUNT(u)->from_etc_fstab = true;
 937         }
 938
 939         free(mp->what);
 940         mp->what = w;
 941
 942         free(mp->options);
 943         mp->options = o;
 944
 945         free(mp->fstype);
 946         mp->fstype = f;
 947
 948         unit_add_to_dbus_queue(u);
 949
 950         return 0;
 951
 952 fail:
 953         free(w);
 954         free(o);
 955         free(f);
 956
 957         if (delete && u)
 958                 unit_free(u);
 959
 960         return 0;
 961 }
 962
 963 static char *fstab_node_to_udev_node(char *p) {
 964         char *dn, *t;
 965         int r;
 966
 967         /* FIXME: to follow udev's logic 100% we need to leave valid
 968          * UTF8 chars unescaped */
 969
 970         if (startswith(p, "LABEL=")) {
 971
 972                 if (!(t = xescape(p+6, "/ ")))
 973                         return NULL;
 974
 975                 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
 976                 free(t);
 977
 978                 if (r < 0)
 979                         return NULL;
 980
 981                 return dn;
 982         }
 983
 984         if (startswith(p, "UUID=")) {
 985
 986                 if (!(t = xescape(p+5, "/ ")))
 987                         return NULL;
 988
 989                 r = asprintf(&dn, "/dev/disk/by-uuid/%s", ascii_strlower(t));
 990                 free(t);
 991
 992                 if (r < 0)
 993                         return NULL;
 994
 995                 return dn;
 996         }
 997
 998         return strdup(p);
 999 }
1000
1001 static int mount_load_etc_fstab(Manager *m) {
1002         FILE *f;
1003         int r;
1004         struct mntent* me;
1005
1006         assert(m);
1007
1008         errno = 0;
1009         if (!(f = setmntent("/etc/fstab", "r")))
1010                 return -errno;
1011
1012         while ((me = getmntent(f))) {
1013                 char *where, *what;
1014
1015                 if (!(what = fstab_node_to_udev_node(me->mnt_fsname))) {
1016                         r = -ENOMEM;
1017                         goto finish;
1018                 }
1019
1020                 if (!(where = strdup(me->mnt_dir))) {
1021                         free(what);
1022                         r = -ENOMEM;
1023                         goto finish;
1024                 }
1025
1026                 if (what[0] == '/')
1027                         path_kill_slashes(what);
1028
1029                 if (where[0] == '/')
1030                         path_kill_slashes(where);
1031
1032                 r = mount_add_one(m, what, where, me->mnt_opts, me->mnt_type, false, false);
1033                 free(what);
1034                 free(where);
1035
1036                 if (r < 0)
1037                         goto finish;
1038         }
1039
1040         r = 0;
1041 finish:
1042
1043         endmntent(f);
1044         return r;
1045 }
1046
1047 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
1048         int r;
1049         char *device, *path, *options, *fstype, *d, *p;
1050
1051         assert(m);
1052
1053         rewind(m->proc_self_mountinfo);
1054
1055         for (;;) {
1056                 int k;
1057
1058                 device = path = options = fstype = d = p = NULL;
1059
1060                 if ((k = fscanf(m->proc_self_mountinfo,
1061                                 "%*s "       /* (1) mount id */
1062                                 "%*s "       /* (2) parent id */
1063                                 "%*s "       /* (3) major:minor */
1064                                 "%*s "       /* (4) root */
1065                                 "%ms "       /* (5) mount point */
1066                                 "%ms"        /* (6) mount options */
1067                                 "%*[^-]"     /* (7) optional fields */
1068                                 "- "         /* (8) seperator */
1069                                 "%ms "       /* (9) file system type */
1070                                 "%ms"        /* (10) mount source */
1071                                 "%*[^\n]",   /* some rubbish at the end */
1072                                 &path,
1073                                 &options,
1074                                 &fstype,
1075                                 &device)) != 4) {
1076
1077                         if (k == EOF)
1078                                 break;
1079
1080                         r = -EBADMSG;
1081                         goto finish;
1082                 }
1083
1084                 if (!(d = cunescape(device)) ||
1085                     !(p = cunescape(path))) {
1086                         r = -ENOMEM;
1087                         goto finish;
1088                 }
1089
1090                 if ((r = mount_add_one(m, d, p, options, fstype, true, set_flags)) < 0)
1091                         goto finish;
1092
1093                 free(device);
1094                 free(path);
1095                 free(options);
1096                 free(fstype);
1097                 free(d);
1098                 free(p);
1099         }
1100
1101         r = 0;
1102
1103 finish:
1104         free(device);
1105         free(path);
1106         free(options);
1107         free(fstype);
1108         free(d);
1109         free(p);
1110
1111         return r;
1112 }
1113
1114 static void mount_shutdown(Manager *m) {
1115         assert(m);
1116
1117         if (m->proc_self_mountinfo)
1118                 fclose(m->proc_self_mountinfo);
1119 }
1120
1121 static int mount_enumerate(Manager *m) {
1122         int r;
1123         struct epoll_event ev;
1124         assert(m);
1125
1126         if (!(m->proc_self_mountinfo = fopen("/proc/self/mountinfo", "r")))
1127                 return -errno;
1128
1129         m->mount_watch.type = WATCH_MOUNT;
1130         m->mount_watch.fd = fileno(m->proc_self_mountinfo);
1131
1132         zero(ev);
1133         ev.events = EPOLLERR;
1134         ev.data.ptr = &m->mount_watch;
1135
1136         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->mount_watch.fd, &ev) < 0)
1137                 return -errno;
1138
1139         if ((r = mount_load_etc_fstab(m)) < 0)
1140                 goto fail;
1141
1142         if ((r = mount_load_proc_self_mountinfo(m, false)) < 0)
1143                 goto fail;
1144
1145         return 0;
1146
1147 fail:
1148         mount_shutdown(m);
1149         return r;
1150 }
1151
1152 void mount_fd_event(Manager *m, int events) {
1153         Meta *meta;
1154         int r;
1155
1156         assert(m);
1157         assert(events == EPOLLERR);
1158
1159         /* The manager calls this for every fd event happening on the
1160          * /proc/self/mountinfo file, which informs us about mounting
1161          * table changes */
1162
1163         if ((r = mount_load_proc_self_mountinfo(m, true)) < 0) {
1164                 log_error("Failed to reread /proc/self/mountinfo: %s", strerror(-errno));
1165
1166                 /* Reset flags, just in case, for later calls */
1167                 LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1168                         Mount *mount = (Mount*) meta;
1169
1170                         mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1171                 }
1172
1173                 return;
1174         }
1175
1176         manager_dispatch_load_queue(m);
1177
1178         LIST_FOREACH(units_per_type, meta, m->units_per_type[UNIT_MOUNT]) {
1179                 Mount *mount = (Mount*) meta;
1180
1181                 if (!mount->is_mounted) {
1182                         /* This has just been unmounted. */
1183
1184                         mount->from_proc_self_mountinfo = false;
1185
1186                         switch (mount->state) {
1187
1188                         case MOUNT_MOUNTED:
1189                                 mount_enter_dead(mount, true);
1190                                 break;
1191
1192                         default:
1193                                 mount_set_state(mount, mount->state);
1194                                 break;
1195
1196                         }
1197
1198                 } else if (mount->just_mounted || mount->just_changed) {
1199
1200                         /* New or changed entrymount */
1201
1202                         switch (mount->state) {
1203
1204                         case MOUNT_DEAD:
1205                         case MOUNT_MAINTAINANCE:
1206                                 mount_enter_mounted(mount, true);
1207                                 break;
1208
1209                         case MOUNT_MOUNTING:
1210                                 mount_enter_mounting_done(mount, true);
1211                                 break;
1212
1213                         default:
1214                                 /* Nothing really changed, but let's
1215                                  * issue an notification call
1216                                  * nonetheless, in case somebody is
1217                                  * waiting for this. (e.g. file system
1218                                  * ro/rw remounts.) */
1219                                 mount_set_state(mount, mount->state);
1220                                 break;
1221                         }
1222                 }
1223
1224                 /* Reset the flags for later calls */
1225                 mount->is_mounted = mount->just_mounted = mount->just_changed = false;
1226         }
1227 }
1228
1229 int mount_path_is_mounted(Manager *m, const char* path) {
1230         char *t;
1231         int r;
1232
1233         assert(m);
1234         assert(path);
1235
1236         if (path[0] != '/')
1237                 return 1;
1238
1239         if (!(t = strdup(path)))
1240                 return -ENOMEM;
1241
1242         path_kill_slashes(t);
1243
1244         for (;;) {
1245                 char *e, *slash;
1246                 Unit *u;
1247
1248                 if (!(e = unit_name_escape_path(t+1, ".mount"))) {
1249                         r = -ENOMEM;
1250                         goto finish;
1251                 }
1252
1253                 u = manager_get_unit(m, e);
1254                 free(e);
1255
1256                 if (u &&
1257                     (MOUNT(u)->from_etc_fstab || MOUNT(u)->from_fragment) &&
1258                     MOUNT(u)->state != MOUNT_MOUNTED) {
1259                         r = 0;
1260                         goto finish;
1261                 }
1262
1263                 assert_se(slash = strrchr(t, '/'));
1264
1265                 if (slash == t) {
1266                         r = 1;
1267                         goto finish;
1268                 }
1269
1270                 *slash = 0;
1271         }
1272
1273         r = 1;
1274
1275 finish:
1276         free(t);
1277         return r;
1278 }
1279
1280 const UnitVTable mount_vtable = {
1281         .suffix = ".mount",
1282
1283         .no_alias = true,
1284
1285         .init = mount_init,
1286         .load = mount_load,
1287         .done = mount_done,
1288
1289         .coldplug = mount_coldplug,
1290
1291         .dump = mount_dump,
1292
1293         .start = mount_start,
1294         .stop = mount_stop,
1295         .reload = mount_reload,
1296
1297         .active_state = mount_active_state,
1298         .sub_state_to_string = mount_sub_state_to_string,
1299
1300         .sigchld_event = mount_sigchld_event,
1301         .timer_event = mount_timer_event,
1302
1303         .enumerate = mount_enumerate,
1304         .shutdown = mount_shutdown
1305 };