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 #include "virt.h"
  38
  39 static bool arg_skip = false;
  40 static bool arg_force = false;
  41 static bool arg_show_progress = false;
  42
  43 static void start_target(const char *target, bool isolate) {
  44         DBusMessage *m = NULL, *reply = NULL;
  45         DBusError error;
  46         const char *mode, *basic_target = "basic.target";
  47         DBusConnection *bus = NULL;
  48
  49         assert(target);
  50
  51         dbus_error_init(&error);
  52
  53         if (bus_connect(DBUS_BUS_SYSTEM, &bus, NULL, &error) < 0) {
  54                 log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
  55                 goto finish;
  56         }
  57
  58         if (isolate)
  59                 mode = "isolate";
  60         else
  61                 mode = "replace";
  62
  63         log_info("Running request %s/start/%s", target, mode);
  64
  65         if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnitReplace"))) {
  66                 log_error("Could not allocate message.");
  67                 goto finish;
  68         }
  69
  70         /* Start these units only if we can replace base.target with it */
  71
  72         if (!dbus_message_append_args(m,
  73                                       DBUS_TYPE_STRING, &basic_target,
  74                                       DBUS_TYPE_STRING, &target,
  75                                       DBUS_TYPE_STRING, &mode,
  76                                       DBUS_TYPE_INVALID)) {
  77                 log_error("Could not attach target and flag information to message.");
  78                 goto finish;
  79         }
  80
  81         if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
  82
  83                 /* Don't print a warning if we aren't called during
  84                  * startup */
  85                 if (!dbus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB))
  86                         log_error("Failed to start unit: %s", bus_error_message(&error));
  87
  88                 goto finish;
  89         }
  90
  91 finish:
  92         if (m)
  93                 dbus_message_unref(m);
  94
  95         if (reply)
  96                 dbus_message_unref(reply);
  97
  98         if (bus) {
  99                 dbus_connection_flush(bus);
 100                 dbus_connection_close(bus);
 101                 dbus_connection_unref(bus);
 102         }
 103
 104         dbus_error_free(&error);
 105 }
 106
 107 static int parse_proc_cmdline(void) {
 108         char *line, *w, *state;
 109         int r;
 110         size_t l;
 111
 112         if (detect_container(NULL) > 0)
 113                 return 0;
 114
 115         if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
 116                 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
 117                 return 0;
 118         }
 119
 120         FOREACH_WORD_QUOTED(w, l, line, state) {
 121
 122                 if (strneq(w, "fsck.mode=auto", l))
 123                         arg_force = arg_skip = false;
 124                 else if (strneq(w, "fsck.mode=force", l))
 125                         arg_force = true;
 126                 else if (strneq(w, "fsck.mode=skip", l))
 127                         arg_skip = true;
 128                 else if (startswith(w, "fsck.mode"))
 129                         log_warning("Invalid fsck.mode= parameter. Ignoring.");
 130 #if defined(TARGET_FEDORA) || defined(TARGET_MANDRIVA) || defined(TARGET_MAGEIA)
 131                 else if (strneq(w, "fastboot", l))
 132                         arg_skip = true;
 133                 else if (strneq(w, "forcefsck", l))
 134                         arg_force = true;
 135 #endif
 136         }
 137
 138         free(line);
 139         return 0;
 140 }
 141
 142 static void test_files(void) {
 143         if (access("/fastboot", F_OK) >= 0)
 144                 arg_skip = true;
 145
 146         if (access("/forcefsck", F_OK) >= 0)
 147                 arg_force = true;
 148
 149         if (access("/run/systemd/show-status", F_OK) >= 0 || plymouth_running())
 150                 arg_show_progress = true;
 151 }
 152
 153 static double percent(int pass, unsigned long cur, unsigned long max) {
 154         /* Values stolen from e2fsck */
 155
 156         static const int pass_table[] = {
 157                 0, 70, 90, 92, 95, 100
 158         };
 159
 160         if (pass <= 0)
 161                 return 0.0;
 162
 163         if ((unsigned) pass >= ELEMENTSOF(pass_table) || max == 0)
 164                 return 100.0;
 165
 166         return (double) pass_table[pass-1] +
 167                 ((double) pass_table[pass] - (double) pass_table[pass-1]) *
 168                 (double) cur / (double) max;
 169 }
 170
 171 static int process_progress(int fd) {
 172         FILE *f, *console;
 173         usec_t last = 0;
 174         bool locked = false;
 175         int clear = 0;
 176
 177         f = fdopen(fd, "r");
 178         if (!f) {
 179                 close_nointr_nofail(fd);
 180                 return -errno;
 181         }
 182
 183         console = fopen("/dev/console", "w");
 184         if (!console) {
 185                 fclose(f);
 186                 return -ENOMEM;
 187         }
 188
 189         while (!feof(f)) {
 190                 int pass, m;
 191                 unsigned long cur, max;
 192                 char *device;
 193                 double p;
 194                 usec_t t;
 195
 196                 if (fscanf(f, "%i %lu %lu %ms", &pass, &cur, &max, &device) != 4)
 197                         break;
 198
 199                 /* Only show one progress counter at max */
 200                 if (!locked) {
 201                         if (flock(fileno(console), LOCK_EX|LOCK_NB) < 0) {
 202                                 free(device);
 203                                 continue;
 204                         }
 205
 206                         locked = true;
 207                 }
 208
 209                 /* Only update once every 50ms */
 210                 t = now(CLOCK_MONOTONIC);
 211                 if (last + 50 * USEC_PER_MSEC > t)  {
 212                         free(device);
 213                         continue;
 214                 }
 215
 216                 last = t;
 217
 218                 p = percent(pass, cur, max);
 219                 fprintf(console, "\r%s: fsck %3.1f%% complete...\r%n", device, p, &m);
 220                 fflush(console);
 221
 222                 free(device);
 223
 224                 if (m > clear)
 225                         clear = m;
 226         }
 227
 228         if (clear > 0) {
 229                 unsigned j;
 230
 231                 fputc('\r', console);
 232                 for (j = 0; j < (unsigned) clear; j++)
 233                         fputc(' ', console);
 234                 fputc('\r', console);
 235                 fflush(console);
 236         }
 237
 238         fclose(f);
 239         fclose(console);
 240         return 0;
 241 }
 242
 243 int main(int argc, char *argv[]) {
 244         const char *cmdline[9];
 245         int i = 0, r = EXIT_FAILURE, q;
 246         pid_t pid;
 247         siginfo_t status;
 248         struct udev *udev = NULL;
 249         struct udev_device *udev_device = NULL;
 250         const char *device;
 251         bool root_directory;
 252         int progress_pipe[2] = { -1, -1 };
 253         char dash_c[2+10+1];
 254
 255         if (argc > 2) {
 256                 log_error("This program expects one or no arguments.");
 257                 return EXIT_FAILURE;
 258         }
 259
 260         log_set_target(LOG_TARGET_AUTO);
 261         log_parse_environment();
 262         log_open();
 263
 264         umask(0022);
 265
 266         parse_proc_cmdline();
 267         test_files();
 268
 269         if (!arg_force && arg_skip)
 270                 return 0;
 271
 272         if (argc > 1) {
 273                 device = argv[1];
 274                 root_directory = false;
 275         } else {
 276                 struct stat st;
 277                 struct timespec times[2];
 278
 279                 /* Find root device */
 280
 281                 if (stat("/", &st) < 0) {
 282                         log_error("Failed to stat() the root directory: %m");
 283                         goto finish;
 284                 }
 285
 286                 /* Virtual root devices don't need an fsck */
 287                 if (major(st.st_dev) == 0)
 288                         return 0;
 289
 290                 /* check if we are already writable */
 291                 times[0] = st.st_atim;
 292                 times[1] = st.st_mtim;
 293                 if (utimensat(AT_FDCWD, "/", times, 0) == 0) {
 294                         log_info("Root directory is writable, skipping check.");
 295                         return 0;
 296                 }
 297
 298                 if (!(udev = udev_new())) {
 299                         log_error("Out of memory");
 300                         goto finish;
 301                 }
 302
 303                 if (!(udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev))) {
 304                         log_error("Failed to detect root device.");
 305                         goto finish;
 306                 }
 307
 308                 if (!(device = udev_device_get_devnode(udev_device))) {
 309                         log_error("Failed to detect device node of root directory.");
 310                         goto finish;
 311                 }
 312
 313                 root_directory = true;
 314         }
 315
 316         if (arg_show_progress)
 317                 if (pipe(progress_pipe) < 0) {
 318                         log_error("pipe(): %m");
 319                         goto finish;
 320                 }
 321
 322         cmdline[i++] = "/sbin/fsck";
 323         cmdline[i++] = "-a";
 324         cmdline[i++] = "-T";
 325         cmdline[i++] = "-l";
 326
 327         if (!root_directory)
 328                 cmdline[i++] = "-M";
 329
 330         if (arg_force)
 331                 cmdline[i++] = "-f";
 332
 333         if (progress_pipe[1] >= 0) {
 334                 snprintf(dash_c, sizeof(dash_c), "-C%i", progress_pipe[1]);
 335                 char_array_0(dash_c);
 336                 cmdline[i++] = dash_c;
 337         }
 338
 339         cmdline[i++] = device;
 340         cmdline[i++] = NULL;
 341
 342         pid = fork();
 343         if (pid < 0) {
 344                 log_error("fork(): %m");
 345                 goto finish;
 346         } else if (pid == 0) {
 347                 /* Child */
 348                 if (progress_pipe[0] >= 0)
 349                         close_nointr_nofail(progress_pipe[0]);
 350                 execv(cmdline[0], (char**) cmdline);
 351                 _exit(8); /* Operational error */
 352         }
 353
 354         if (progress_pipe[1] >= 0) {
 355                 close_nointr_nofail(progress_pipe[1]);
 356                 progress_pipe[1] = -1;
 357         }
 358
 359         if (progress_pipe[0] >= 0) {
 360                 process_progress(progress_pipe[0]);
 361                 progress_pipe[0] = -1;
 362         }
 363
 364         q = wait_for_terminate(pid, &status);
 365         if (q < 0) {
 366                 log_error("waitid(): %s", strerror(-q));
 367                 goto finish;
 368         }
 369
 370         if (status.si_code != CLD_EXITED || (status.si_status & ~1)) {
 371
 372                 if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED)
 373                         log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
 374                 else if (status.si_code == CLD_EXITED)
 375                         log_error("fsck failed with error code %i.", status.si_status);
 376                 else
 377                         log_error("fsck failed due to unknown reason.");
 378
 379                 if (status.si_code == CLD_EXITED && (status.si_status & 2) && root_directory)
 380                         /* System should be rebooted. */
 381                         start_target(SPECIAL_REBOOT_TARGET, false);
 382                 else if (status.si_code == CLD_EXITED && (status.si_status & 6))
 383                         /* Some other problem */
 384                         start_target(SPECIAL_EMERGENCY_TARGET, true);
 385                 else {
 386                         r = EXIT_SUCCESS;
 387                         log_warning("Ignoring error.");
 388                 }
 389
 390         } else
 391                 r = EXIT_SUCCESS;
 392
 393         if (status.si_code == CLD_EXITED && (status.si_status & 1))
 394                 touch("/run/systemd/quotacheck");
 395
 396 finish:
 397         if (udev_device)
 398                 udev_device_unref(udev_device);
 399
 400         if (udev)
 401                 udev_unref(udev);
 402
 403         close_pipe(progress_pipe);
 404
 405         return r;
 406 }