mirror of
https://github.com/troglobit/finit.git
synced 2026-10-01 05:22:48 +07:00
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/* Mount and unmount helpers
|
|
*
|
|
* Copyright (c) 2016-2023 Joachim Wiberg <troglobit@gmail.com>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "config.h" /* Generated by configure script */
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#ifdef HAVE_MNTENT_H
|
|
#include <mntent.h>
|
|
#endif
|
|
#include <sys/mount.h>
|
|
|
|
#include "helpers.h"
|
|
|
|
/*
|
|
* SysV init on Debian/Ubuntu skips these protected mount points
|
|
*
|
|
* It also skips anything below /proc, /sys and /run for good measure so
|
|
* we do the same here. What we want is a list of non-protected tmpfs
|
|
* and regular filesystems that can be safely unmounted before we do
|
|
* swapoff, and remount / as read-only, respectively.
|
|
*/
|
|
static int is_protected(char *dir)
|
|
{
|
|
size_t i;
|
|
char *protected_mnts[] = {
|
|
"/sys", "/proc",
|
|
"/.dev", "/dev", "/dev/pts", "/dev/shm", "dev/.static/dev", "/dev/vcs",
|
|
"/run", "/var/run",
|
|
"/", NULL
|
|
};
|
|
char *any[] = {
|
|
"/proc/", "/sys/", "/run/", NULL
|
|
};
|
|
|
|
for (i = 0; protected_mnts[i]; i++) {
|
|
if (!strcmp(dir, protected_mnts[i]))
|
|
return 1;
|
|
}
|
|
|
|
for (i = 0; any[i]; i++) {
|
|
if (!strncmp(dir, any[i], strlen(any[i])))
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void iterator_end(FILE **fp)
|
|
{
|
|
endmntent(*fp);
|
|
*fp = NULL;
|
|
}
|
|
|
|
static struct mntent *iterator(char *filename, FILE **fp)
|
|
{
|
|
static struct mntent *mnt;
|
|
|
|
if (!*fp && filename) {
|
|
*fp = setmntent(filename, "r");
|
|
if (!*fp)
|
|
return NULL;
|
|
}
|
|
|
|
while ((mnt = getmntent(*fp))) {
|
|
if (is_protected(mnt->mnt_dir))
|
|
continue;
|
|
|
|
return mnt;
|
|
}
|
|
|
|
iterator_end(fp);
|
|
return NULL;
|
|
}
|
|
|
|
static int unmount(const char *target)
|
|
{
|
|
int rc;
|
|
|
|
dbg("Unmounting %s", target);
|
|
|
|
rc = umount(target);
|
|
if (rc) {
|
|
if (errno != EBUSY)
|
|
print(2, "Failed unmounting %s, error %d: %s", target, errno, strerror(errno));
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void unmount_tmpfs(void)
|
|
{
|
|
struct mntent *mnt;
|
|
FILE *fp = NULL;
|
|
|
|
while ((mnt = iterator("/proc/mounts", &fp))) {
|
|
if (!strcmp("tmpfs", mnt->mnt_fsname) && !unmount(mnt->mnt_dir))
|
|
iterator_end(&fp); /* Restart iteration */
|
|
}
|
|
}
|
|
|
|
void unmount_regular(void)
|
|
{
|
|
struct mntent *mnt;
|
|
FILE *fp = NULL;
|
|
|
|
while ((mnt = iterator("/proc/mounts", &fp))) {
|
|
if (!unmount(mnt->mnt_dir))
|
|
iterator_end(&fp); /* Restart iteration */
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Local Variables:
|
|
* indent-tabs-mode: t
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|