mirror of
https://github.com/troglobit/finit.git
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117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/* Mount and unmount helpers
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*
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* Copyright (c) 2016-2021 Joachim Wiberg <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include <mntent.h>
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#include <sys/mount.h>
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/*
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* SysV init on Debian/Ubuntu skips these protected mount points
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*
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* It also skips anything below /proc, /sys and /run for good measure so
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* we do the same here. What we want is a list of non-protected tmpfs
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* and regular filesystems that can be safely unmounted before we do
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* swapoff, and remount / as read-only, respectively.
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*/
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static int is_protected(char *dir)
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{
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size_t i;
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char *protected_mnts[] = {
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"/sys", "/proc",
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"/.dev", "/dev", "/dev/pts", "/dev/shm", "dev/.static/dev", "/dev/vcs",
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"/run", "/var/run",
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"/", NULL
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};
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char *any[] = {
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"/proc/", "/sys/", "/run/", NULL
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};
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for (i = 0; protected_mnts[i]; i++) {
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if (!strcmp(dir, protected_mnts[i]))
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return 1;
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}
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for (i = 0; any[i]; i++) {
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if (!strncmp(dir, any[i], strlen(any[i])))
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return 1;
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}
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return 0;
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}
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static void iterator_end(FILE **fp)
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{
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endmntent(*fp);
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*fp = NULL;
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}
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static struct mntent *iterator(char *fstab, FILE **fp)
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{
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static struct mntent *mnt;
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if (!*fp && fstab) {
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*fp = setmntent(fstab, "r");
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if (!*fp)
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return NULL;
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}
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while ((mnt = getmntent(*fp))) {
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if (is_protected(mnt->mnt_dir))
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continue;
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return mnt;
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}
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iterator_end(fp);
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return NULL;
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}
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void unmount_tmpfs(void)
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{
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struct mntent *mnt;
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FILE *fp = NULL;
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while ((mnt = iterator("/proc/mounts", &fp))) {
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if (!strcmp("tmpfs", mnt->mnt_fsname) && !umount(mnt->mnt_dir))
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iterator_end(&fp); /* Restart iteration */
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}
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}
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void unmount_regular(void)
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{
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struct mntent *mnt;
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FILE *fp = NULL;
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while ((mnt = iterator("/proc/mounts", &fp))) {
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if (!umount(mnt->mnt_dir))
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iterator_end(&fp); /* Restart iteration */
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}
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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