remount-fs.c revision da927ba997d68401563b927f92e6e40e021a8e5c
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
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 <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <mntent.h>
#include "log.h"
#include "util.h"
#include "path-util.h"
#include "set.h"
#include "mount-setup.h"
#include "exit-status.h"
/* Goes through /etc/fstab and remounts all API file systems, applying
* options that are in /etc/fstab that systemd might not have
* respected */
int main(int argc, char *argv[]) {
int ret = EXIT_FAILURE;
_cleanup_endmntent_ FILE *f = NULL;
struct mntent* me;
Hashmap *pids = NULL;
if (argc > 1) {
log_error("This program takes no argument.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
f = setmntent("/etc/fstab", "r");
if (!f) {
if (errno == ENOENT)
return EXIT_SUCCESS;
log_error("Failed to open /etc/fstab: %m");
return EXIT_FAILURE;
}
pids = hashmap_new(NULL);
if (!pids) {
log_error("Failed to allocate set");
goto finish;
}
ret = EXIT_SUCCESS;
while ((me = getmntent(f))) {
pid_t pid;
int k;
char *s;
/* Remount the root fs, /usr and all API VFS */
if (!mount_point_is_api(me->mnt_dir) &&
!path_equal(me->mnt_dir, "/") &&
!path_equal(me->mnt_dir, "/usr"))
continue;
log_debug("Remounting %s", me->mnt_dir);
pid = fork();
if (pid < 0) {
log_error("Failed to fork: %m");
ret = EXIT_FAILURE;
continue;
}
if (pid == 0) {
const char *arguments[5];
/* Child */
arguments[0] = "/bin/mount";
arguments[1] = me->mnt_dir;
arguments[2] = "-o";
arguments[3] = "remount";
arguments[4] = NULL;
execv("/bin/mount", (char **) arguments);
log_error("Failed to execute /bin/mount: %m");
_exit(EXIT_FAILURE);
}
/* Parent */
s = strdup(me->mnt_dir);
if (!s) {
log_oom();
ret = EXIT_FAILURE;
continue;
}
k = hashmap_put(pids, UINT_TO_PTR(pid), s);
if (k < 0) {
log_error_errno(k, "Failed to add PID to set: %m");
ret = EXIT_FAILURE;
continue;
}
}
while (!hashmap_isempty(pids)) {
siginfo_t si = {};
char *s;
if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
if (errno == EINTR)
continue;
log_error("waitid() failed: %m");
ret = EXIT_FAILURE;
break;
}
s = hashmap_remove(pids, UINT_TO_PTR(si.si_pid));
if (s) {
if (!is_clean_exit(si.si_code, si.si_status, NULL)) {
if (si.si_code == CLD_EXITED)
log_error("/bin/mount for %s exited with exit status %i.", s, si.si_status);
else
log_error("/bin/mount for %s terminated by signal %s.", s, signal_to_string(si.si_status));
ret = EXIT_FAILURE;
}
free(s);
}
}
finish:
if (pids)
hashmap_free_free(pids);
return ret;
}