summaryrefslogtreecommitdiff
path: root/src/fsck/fsck.c
blob: 6ccb2e7340edc521675ffa09a0a7b38badca548b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering
  Copyright 2014 Holger Hans Peter Freyther

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/stat.h>

#include "sd-bus.h"
#include "libudev.h"

#include "util.h"
#include "special.h"
#include "bus-util.h"
#include "bus-error.h"
#include "bus-common-errors.h"
#include "fileio.h"
#include "udev-util.h"
#include "path-util.h"
#include "socket-util.h"
#include "fsckd/fsckd.h"

static bool arg_skip = false;
static bool arg_force = false;
static bool arg_show_progress = false;
static const char *arg_repair = "-a";

static void start_target(const char *target) {
        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
        _cleanup_bus_close_unref_ sd_bus *bus = NULL;
        int r;

        assert(target);

        r = bus_open_system_systemd(&bus);
        if (r < 0) {
                log_error_errno(r, "Failed to get D-Bus connection: %m");
                return;
        }

        log_info("Running request %s/start/replace", target);

        /* Start these units only if we can replace base.target with it */
        r = sd_bus_call_method(bus,
                               "org.freedesktop.systemd1",
                               "/org/freedesktop/systemd1",
                               "org.freedesktop.systemd1.Manager",
                               "StartUnitReplace",
                               &error,
                               NULL,
                               "sss", "basic.target", target, "replace");

        /* Don't print a warning if we aren't called during startup */
        if (r < 0 && !sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_JOB))
                log_error("Failed to start unit: %s", bus_error_message(&error, -r));
}

static int parse_proc_cmdline_item(const char *key, const char *value) {

        if (streq(key, "fsck.mode") && value) {

                if (streq(value, "auto"))
                        arg_force = arg_skip = false;
                else if (streq(value, "force"))
                        arg_force = true;
                else if (streq(value, "skip"))
                        arg_skip = true;
                else
                        log_warning("Invalid fsck.mode= parameter '%s'. Ignoring.", value);

        } else if (streq(key, "fsck.repair") && value) {

                if (streq(value, "preen"))
                        arg_repair = "-a";
                else if (streq(value, "yes"))
                        arg_repair = "-y";
                else if (streq(value, "no"))
                        arg_repair = "-n";
                else
                        log_warning("Invalid fsck.repair= parameter '%s'. Ignoring.", value);
        }

#ifdef HAVE_SYSV_COMPAT
        else if (streq(key, "fastboot") && !value) {
                log_warning("Please pass 'fsck.mode=skip' rather than 'fastboot' on the kernel command line.");
                arg_skip = true;

        } else if (streq(key, "forcefsck") && !value) {
                log_warning("Please pass 'fsck.mode=force' rather than 'forcefsck' on the kernel command line.");
                arg_force = true;
        }
#endif

        return 0;
}

static void test_files(void) {

#ifdef HAVE_SYSV_COMPAT
        if (access("/fastboot", F_OK) >= 0) {
                log_error("Please pass 'fsck.mode=skip' on the kernel command line rather than creating /fastboot on the root file system.");
                arg_skip = true;
        }

        if (access("/forcefsck", F_OK) >= 0) {
                log_error("Please pass 'fsck.mode=force' on the kernel command line rather than creating /forcefsck on the root file system.");
                arg_force = true;
        }
#endif

        if (access("/run/systemd/show-status", F_OK) >= 0 || plymouth_running())
                arg_show_progress = true;
}

static int process_progress(int fd, dev_t device_num) {
        _cleanup_fclose_ FILE *f = NULL;
        usec_t last = 0;
        _cleanup_close_ int fsckd_fd = -1;
        static const union sockaddr_union sa = {
                .un.sun_family = AF_UNIX,
                .un.sun_path = FSCKD_SOCKET_PATH,
        };

        fsckd_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
        if (fsckd_fd < 0)
                return log_warning_errno(errno, "Cannot open fsckd socket, we won't report fsck progress: %m");
        if (connect(fsckd_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0)
                return log_warning_errno(errno, "Cannot connect to fsckd socket, we won't report fsck progress: %m");

        f = fdopen(fd, "r");
        if (!f)
                return log_warning_errno(errno, "Cannot connect to fsck, we won't report fsck progress: %m");

        while (!feof(f)) {
                int pass;
                size_t cur, max;
                ssize_t n;
                usec_t t;
                _cleanup_free_ char *device = NULL;
                FsckProgress progress;

                if (fscanf(f, "%i %lu %lu %ms", &pass, &cur, &max, &device) != 4)
                        break;

                /* Only update once every 50ms */
                t = now(CLOCK_MONOTONIC);
                if (last + 50 * USEC_PER_MSEC > t)
                        continue;

                last = t;

                /* send progress to fsckd */
                progress.devnum = device_num;
                progress.cur = cur;
                progress.max = max;
                progress.pass = pass;

                n = send(fsckd_fd, &progress, sizeof(FsckProgress), 0);
                if (n < 0 || (size_t) n < sizeof(FsckProgress))
                        log_warning_errno(errno, "Cannot communicate fsck progress to fsckd: %m");
        }

        return 0;
}

int main(int argc, char *argv[]) {
        const char *cmdline[9];
        int i = 0, r = EXIT_FAILURE, q;
        pid_t pid;
        siginfo_t status;
        _cleanup_udev_unref_ struct udev *udev = NULL;
        _cleanup_udev_device_unref_ struct udev_device *udev_device = NULL;
        const char *device, *type;
        bool root_directory;
        int progress_pipe[2] = { -1, -1 };
        char dash_c[sizeof("-C")-1 + DECIMAL_STR_MAX(int) + 1];
        struct stat st;

        if (argc > 2) {
                log_error("This program expects one or no arguments.");
                return EXIT_FAILURE;
        }

        log_set_target(LOG_TARGET_AUTO);
        log_parse_environment();
        log_open();

        umask(0022);

        q = parse_proc_cmdline(parse_proc_cmdline_item);
        if (q < 0)
                log_warning_errno(q, "Failed to parse kernel command line, ignoring: %m");

        test_files();

        if (!arg_force && arg_skip)
                return 0;

        udev = udev_new();
        if (!udev) {
                log_oom();
                return EXIT_FAILURE;
        }

        if (argc > 1) {
                device = argv[1];
                root_directory = false;

                if (stat(device, &st) < 0) {
                        log_error_errno(errno, "Failed to stat '%s': %m", device);
                        return EXIT_FAILURE;
                }

                udev_device = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
                if (!udev_device) {
                        log_error("Failed to detect device %s", device);
                        return EXIT_FAILURE;
                }
        } else {
                struct timespec times[2];

                /* Find root device */

                if (stat("/", &st) < 0) {
                        log_error_errno(errno, "Failed to stat() the root directory: %m");
                        return EXIT_FAILURE;
                }

                /* Virtual root devices don't need an fsck */
                if (major(st.st_dev) == 0)
                        return EXIT_SUCCESS;

                /* check if we are already writable */
                times[0] = st.st_atim;
                times[1] = st.st_mtim;
                if (utimensat(AT_FDCWD, "/", times, 0) == 0) {
                        log_info("Root directory is writable, skipping check.");
                        return EXIT_SUCCESS;
                }

                udev_device = udev_device_new_from_devnum(udev, 'b', st.st_dev);
                if (!udev_device) {
                        log_error("Failed to detect root device.");
                        return EXIT_FAILURE;
                }

                device = udev_device_get_devnode(udev_device);
                if (!device) {
                        log_error("Failed to detect device node of root directory.");
                        return EXIT_FAILURE;
                }

                root_directory = true;
        }

        type = udev_device_get_property_value(udev_device, "ID_FS_TYPE");
        if (type) {
                r = fsck_exists(type);
                if (r == -ENOENT) {
                        log_info("fsck.%s doesn't exist, not checking file system on %s", type, device);
                        return EXIT_SUCCESS;
                } else if (r < 0)
                        log_warning_errno(r, "fsck.%s cannot be used for %s: %m", type, device);
        }

        if (arg_show_progress)
                if (pipe(progress_pipe) < 0) {
                        log_error_errno(errno, "pipe(): %m");
                        return EXIT_FAILURE;
                }

        cmdline[i++] = "/sbin/fsck";
        cmdline[i++] =  arg_repair;
        cmdline[i++] = "-T";

        /*
         * Since util-linux v2.25 fsck uses /run/fsck/<diskname>.lock files.
         * The previous versions use flock for the device and conflict with
         * udevd, see https://bugs.freedesktop.org/show_bug.cgi?id=79576#c5
         */
        cmdline[i++] = "-l";

        if (!root_directory)
                cmdline[i++] = "-M";

        if (arg_force)
                cmdline[i++] = "-f";

        if (progress_pipe[1] >= 0) {
                xsprintf(dash_c, "-C%i", progress_pipe[1]);
                cmdline[i++] = dash_c;
        }

        cmdline[i++] = device;
        cmdline[i++] = NULL;

        pid = fork();
        if (pid < 0) {
                log_error_errno(errno, "fork(): %m");
                goto finish;
        } else if (pid == 0) {
                /* Child */
                if (progress_pipe[0] >= 0)
                        safe_close(progress_pipe[0]);
                execv(cmdline[0], (char**) cmdline);
                _exit(8); /* Operational error */
        }

        progress_pipe[1] = safe_close(progress_pipe[1]);

        if (progress_pipe[0] >= 0) {
                process_progress(progress_pipe[0], st.st_rdev);
                progress_pipe[0] = -1;
        }

        q = wait_for_terminate(pid, &status);
        if (q < 0) {
                log_error_errno(q, "waitid(): %m");
                goto finish;
        }

        if (status.si_code != CLD_EXITED || (status.si_status & ~1)) {

                if (status.si_code == CLD_KILLED || status.si_code == CLD_DUMPED)
                        log_error("fsck terminated by signal %s.", signal_to_string(status.si_status));
                else if (status.si_code == CLD_EXITED)
                        log_error("fsck failed with error code %i.", status.si_status);
                else
                        log_error("fsck failed due to unknown reason.");

                if (status.si_code == CLD_EXITED && (status.si_status & 2) && root_directory)
                        /* System should be rebooted. */
                        start_target(SPECIAL_REBOOT_TARGET);
                else if (status.si_code == CLD_EXITED && (status.si_status & 6))
                        /* Some other problem */
                        start_target(SPECIAL_EMERGENCY_TARGET);
                else {
                        r = EXIT_SUCCESS;
                        log_warning("Ignoring error.");
                }

        } else
                r = EXIT_SUCCESS;

        if (status.si_code == CLD_EXITED && (status.si_status & 1))
                touch("/run/systemd/quotacheck");

finish:
        safe_close_pair(progress_pipe);

        return r;
}