src/fsck.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   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 <stdio.h>
  23 #include <stdbool.h>
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <sys/file.h>
  29
  30 #include <libudev.h>
  31 #include <dbus/dbus.h>
  32
  33 #include "util.h"
  34 #include "dbus-common.h"
  35 #include "special.h"
  36 #include "bus-errors.h"
  37
  38 static bool arg_skip = false;
  39 static bool arg_force = false;
  40 static bool arg_show_progress = false;
  41
  42 static void start_target(const char *target, bool isolate) {
  43         DBusMessage *m = NULL, *reply = NULL;
  44         DBusError error;
  45         const char *mode, *basic_target = "basic.target";
  46         DBusConnection *bus = NULL;
  47
  48         assert(target);
  49
  50         dbus_error_init(&error);
  51
  52         if (bus_connect(DBUS_BUS_SYSTEM, &bus, NULL, &error) < 0) {
  53                 log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
  54                 goto finish;
  55         }
  56
  57         if (isolate)
  58                 mode = "isolate";
  59         else
  60                 mode = "replace";
  61
  62         log_info("Running request %s/start/%s", target, mode);
  63
  64         if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnitReplace"))) {
  65                 log_error("Could not allocate message.");
  66                 goto finish;
  67         }
  68
  69         /* Start these units only if we can replace base.target with it */
  70
  71         if (!dbus_message_append_args(m,
  72                                       DBUS_TYPE_STRING, &basic_target,
  73                                       DBUS_TYPE_STRING, &target,
  74                                       DBUS_TYPE_STRING, &mode,
  75                                       DBUS_TYPE_INVALID)) {
  76                 log_error("Could not attach target and flag information to message.");
  77                 goto finish;
  78         }
  79
  80         if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
  81
  82                 /* Don't print a waring if we aren't called during
  83                  * startup */
  84                 if (!dbus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB))
  85                         log_error("Failed to start unit: %s", bus_error_message(&error));
  86
  87                 goto finish;
  88         }
  89
  90 finish:
  91         if (m)
  92                 dbus_message_unref(m);
  93
  94         if (reply)
  95                 dbus_message_unref(reply);
  96
  97         if (bus) {
  98                 dbus_connection_flush(bus);
  99                 dbus_connection_close(bus);
 100                 dbus_connection_unref(bus);
 101         }
 102
 103         dbus_error_free(&error);
 104 }
 105
 106 static int parse_proc_cmdline(void) {
 107         char *line, *w, *state;
 108         int r;
 109         size_t l;
 110
 111         if (detect_container(NULL) > 0)
 112                 return 0;
 113
 114         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 115                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 116                 return 0;
 117         }
 118
 119         FOREACH_WORD_QUOTED(w, l, line, state) {
 120
 121                 if (strneq(w, "fsck.mode=auto", l))
 122                         arg_force = arg_skip = false;
 123                 else if (strneq(w, "fsck.mode=force", l))
 124                         arg_force = true;
 125                 else if (strneq(w, "fsck.mode=skip", l))
 126                         arg_skip = true;
 127                 else if (startswith(w, "fsck.mode"))
 128                         log_warning("Invalid fsck.mode= parameter. Ignoring.");
 129 #if defined(TARGET_FEDORA) || defined(TARGET_MANDRIVA)
 130                 else if (strneq(w, "fastboot", l))
 131                         arg_skip = true;
 132                 else if (strneq(w, "forcefsck", l))
 133                         arg_force = true;
 134 #endif
 135         }
 136
 137         free(line);
 138         return 0;
 139 }
 140
 141 static void test_files(void) {
 142         if (access("/fastboot", F_OK) >= 0)
 143                 arg_skip = true;
 144
 145         if (access("/forcefsck", F_OK) >= 0)
 146                 arg_force = true;
 147
 148         if (access("/run/systemd/show-status", F_OK) >= 0 || plymouth_running())
 149                 arg_show_progress = true;
 150 }
 151
 152 static double percent(int pass, unsigned long cur, unsigned long max) {
 153         /* Values stolen from e2fsck */
 154
 155         static const int pass_table[] = {
 156                 0, 70, 90, 92, 95, 100
 157         };
 158
 159         if (pass <= 0)
 160                 return 0.0;
 161
 162         if ((unsigned) pass >= ELEMENTSOF(pass_table) || max == 0)
 163                 return 100.0;
 164
 165         return (double) pass_table[pass-1] +
 166                 ((double) pass_table[pass] - (double) pass_table[pass-1]) *
 167                 (double) cur / (double) max;
 168 }
 169
 170 static int process_progress(int fd) {
 171         FILE *f, *console;
 172         usec_t last = 0;
 173         bool locked = false;
 174         int clear = 0;
 175
 176         f = fdopen(fd, "r");
 177         if (!f) {
 178                 close_nointr_nofail(fd);
 179                 return -errno;
 180         }
 181
 182         console = fopen("/dev/console", "w");
 183         if (!console) {
 184                 fclose(f);
 185                 return -ENOMEM;
 186         }
 187
 188         while (!feof(f)) {
 189                 int pass, m;
 190                 unsigned long cur, max;
 191                 char *device;
 192                 double p;
 193                 usec_t t;
 194
 195                 if (fscanf(f, "%i %lu %lu %ms", &pass, &cur, &max, &device) != 4)
 196                         break;
 197
 198                 /* Only show one progress counter at max */
 199                 if (!locked) {
 200                         if (flock(fileno(console), LOCK_EX|LOCK_NB) < 0) {
 201                                 free(device);
 202                                 continue;
 203                         }
 204
 205                         locked = true;
 206                 }
 207
 208                 /* Only update once every 50ms */
 209                 t = now(CLOCK_MONOTONIC);
 210                 if (last + 50 * USEC_PER_MSEC > t)  {
 211                         free(device);
 212                         continue;
 213                 }
 214
 215                 last = t;
 216
 217                 p = percent(pass, cur, max);
 218                 fprintf(console, "\r%s: fsck %3.1f%% complete...\r%n", device, p, &m);
 219                 fflush(console);
 220
 221                 free(device);
 222
 223                 if (m > clear)
 224                         clear = m;
 225         }
 226
 227         if (clear > 0) {
 228                 unsigned j;
 229
 230                 fputc('\r', console);
 231                 for (j = 0; j < (unsigned) clear; j++)
 232                         fputc(' ', console);
 233                 fputc('\r', console);
 234                 fflush(console);
 235         }
 236
 237         fclose(f);
 238         fclose(console);
 239         return 0;
 240 }
 241
 242 int main(int argc, char *argv[]) {
 243         const char *cmdline[9];
 244         int i = 0, r = EXIT_FAILURE, q;
 245         pid_t pid;
 246         siginfo_t status;
 247         struct udev *udev = NULL;
 248         struct udev_device *udev_device = NULL;
 249         const char *device;
 250         bool root_directory;
 251         int progress_pipe[2] = { -1, -1 };
 252         char dash_c[2+10+1];
 253
 254         if (argc > 2) {
 255                 log_error("This program expects one or no arguments.");
 256                 return EXIT_FAILURE;
 257         }
 258
 259         log_set_target(LOG_TARGET_AUTO);
 260         log_parse_environment();
 261         log_open();
 262
 263         umask(0022);
 264
 265         parse_proc_cmdline();
 266         test_files();
 267
 268         if (!arg_force && arg_skip)
 269                 return 0;
 270
 271         if (argc > 1) {
 272                 device = argv[1];
 273                 root_directory = false;
 274         } else {
 275                 struct stat st;
 276                 struct timespec times[2];
 277
 278                 /* Find root device */
 279
 280                 if (stat("/", &st) < 0) {
 281                         log_error("Failed to stat() the root directory: %m");
 282                         goto finish;
 283                 }
 284
 285                 /* Virtual root devices don't need an fsck */
 286                 if (major(st.st_dev) == 0)
 287                         return 0;
 288
 289                 /* check if we are already writable */
 290                 times[0] = st.st_atim;
 291                 times[1] = st.st_mtim;
 292                 if (utimensat(AT_FDCWD, "/", times, 0) == 0) {
 293                         log_info("Root directory is writable, skipping check.");
 294                         return 0;
 295                 }
 296
 297                 if (!(udev = udev_new())) {
 298                         log_error("Out of memory");
 299                         goto finish;
 300                 }
 301
 302                 if (!(udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev))) {
 303                         log_error("Failed to detect root device.");
 304                         goto finish;
 305                 }
 306
 307                 if (!(device = udev_device_get_devnode(udev_device))) {
 308                         log_error("Failed to detect device node of root directory.");
 309                         goto finish;
 310                 }
 311
 312                 root_directory = true;
 313         }
 314
 315         if (arg_show_progress)
 316                 if (pipe(progress_pipe) < 0) {
 317                         log_error("pipe(): %m");
 318                         goto finish;
 319                 }
 320
 321         cmdline[i++] = "/sbin/fsck";
 322         cmdline[i++] = "-a";
 323         cmdline[i++] = "-T";
 324         cmdline[i++] = "-l";
 325
 326         if (!root_directory)
 327                 cmdline[i++] = "-M";
 328
 329         if (arg_force)
 330                 cmdline[i++] = "-f";
 331
 332         if (progress_pipe[1] >= 0) {
 333                 snprintf(dash_c, sizeof(dash_c), "-C%i", progress_pipe[1]);
 334                 char_array_0(dash_c);
 335                 cmdline[i++] = dash_c;
 336         }
 337
 338         cmdline[i++] = device;
 339         cmdline[i++] = NULL;
 340
 341         pid = fork();
 342         if (pid < 0) {
 343                 log_error("fork(): %m");
 344                 goto finish;
 345         } else if (pid == 0) {
 346                 /* Child */
 347                 if (progress_pipe[0] >= 0)
 348                         close_nointr_nofail(progress_pipe[0]);
 349                 execv(cmdline[0], (char**) cmdline);
 350                 _exit(8); /* Operational error */
 351         }
 352
 353         if (progress_pipe[1] >= 0) {
 354                 close_nointr_nofail(progress_pipe[1]);
 355                 progress_pipe[1] = -1;
 356         }
 357
 358         if (progress_pipe[0] >= 0) {
 359                 process_progress(progress_pipe[0]);
 360                 progress_pipe[0] = -1;
 361         }
 362
 363         q = wait_for_terminate(pid, &status);
 364         if (q < 0) {
 365                 log_error("waitid(): %s", strerror(-q));
 366                 goto finish;
 367         }
 368
 369         if (status.si_code != CLD_EXITED || (status.si_status & ~1)) {
 370
 371                 if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED)
 372                         log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
 373                 else if (status.si_code == CLD_EXITED)
 374                         log_error("fsck failed with error code %i.", status.si_status);
 375                 else
 376                         log_error("fsck failed due to unknown reason.");
 377
 378                 if (status.si_code == CLD_EXITED && (status.si_status & 2) && root_directory)
 379                         /* System should be rebooted. */
 380                         start_target(SPECIAL_REBOOT_TARGET, false);
 381                 else if (status.si_code == CLD_EXITED && (status.si_status & 6))
 382                         /* Some other problem */
 383                         start_target(SPECIAL_EMERGENCY_TARGET, true);
 384                 else {
 385                         r = EXIT_SUCCESS;
 386                         log_warning("Ignoring error.");
 387                 }
 388
 389         } else
 390                 r = EXIT_SUCCESS;
 391
 392         if (status.si_code == CLD_EXITED && (status.si_status & 1))
 393                 touch("/run/systemd/quotacheck");
 394
 395 finish:
 396         if (udev_device)
 397                 udev_device_unref(udev_device);
 398
 399         if (udev)
 400                 udev_unref(udev);
 401
 402         close_pipe(progress_pipe);
 403
 404         return r;
 405 }