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/*
* undomounts.c
*
* Handles some basic unmounting stuff for init
* Broken out so that it can be used on s390 in a shutdown binary
*
* Erik Troan <ewt@redhat.com>
* Jeremy Katz <katzj@redhat.com>
*
* Copyright 1996 - 2003 Red Hat, Inc.
*
* This software may be freely redistributed under the terms of the GNU
* public license.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/swap.h>
#include <unistd.h>
#include "devt.h"
struct unmountInfo {
char * name;
int mounted;
int loopDevice;
enum { FS, LOOP } what;
} ;
extern int testing;
void undoLoop(struct unmountInfo * fs, int numFs, int this);
static void printstr(char * string) {
write(1, string, strlen(string));
}
void undoMount(struct unmountInfo * fs, int numFs, int this) {
int len = strlen(fs[this].name);
int i;
if (!fs[this].mounted) return;
fs[this].mounted = 0;
/* unmount everything underneath this */
for (i = 0; i < numFs; i++) {
if (fs[i].name && (strlen(fs[i].name) >= len) &&
(fs[i].name[len] == '/') &&
!strncmp(fs[this].name, fs[i].name, len)) {
if (fs[i].what == LOOP)
undoLoop(fs, numFs, i);
else
undoMount(fs, numFs, i);
}
}
printf("\t%s", fs[this].name);
/* don't need to unmount /tmp. it is busy anyway. */
if (!testing) {
if (umount2(fs[this].name, 0) < 0) {
printf(" umount failed (%d)", errno);
} else {
printf(" done");
}
}
printf("\n");
}
void undoLoop(struct unmountInfo * fs, int numFs, int this) {
int i;
int fd;
if (!fs[this].mounted) return;
fs[this].mounted = 0;
/* find the device mount */
for (i = 0; i < numFs; i++) {
if (fs[i].what == FS && (fs[i].loopDevice == fs[this].loopDevice))
break;
}
if (i < numFs) {
/* the device is mounted, unmount it (and recursively, anything
* underneath) */
undoMount(fs, numFs, i);
}
unlink("/tmp/loop");
mknod("/tmp/loop", 0600 | S_IFBLK, (7 << 8) | fs[this].loopDevice);
printf("\tdisabling /dev/loop%d", fs[this].loopDevice);
if ((fd = open("/tmp/loop", O_RDONLY, 0)) < 0) {
printf(" failed to open device: %d", errno);
} else {
if (!testing && ioctl(fd, LOOP_CLR_FD, 0))
printf(" LOOP_CLR_FD failed: %d", errno);
close(fd);
}
printf("\n");
}
void unmountFilesystems(void) {
int fd, size;
char buf[65535]; /* this should be big enough */
char * chptr, * start;
struct unmountInfo filesystems[500];
int numFilesystems = 0;
int i;
struct loop_info li;
char * device;
struct stat sb;
fd = open("/proc/mounts", O_RDONLY, 0);
if (fd < 1) {
/* FIXME: was perror */
printstr("failed to open /proc/mounts");
sleep(2);
return;
}
size = read(fd, buf, sizeof(buf) - 1);
buf[size] = '\0';
close(fd);
chptr = buf;
while (*chptr) {
device = chptr;
while (*chptr != ' ') chptr++;
*chptr++ = '\0';
start = chptr;
while (*chptr != ' ') chptr++;
*chptr++ = '\0';
if (strcmp(start, "/") && strcmp(start, "/tmp")) {
filesystems[numFilesystems].name = strdup(start);
filesystems[numFilesystems].what = FS;
filesystems[numFilesystems].mounted = 1;
stat(start, &sb);
if ((sb.st_dev >> 8) == 7) {
filesystems[numFilesystems].loopDevice = sb.st_dev & 0xf;
} else {
filesystems[numFilesystems].loopDevice = -1;
}
numFilesystems++;
}
while (*chptr != '\n') chptr++;
chptr++;
}
for (i = 0; i < 7; i++) {
unlink("/tmp/loop");
mknod("/tmp/loop", 0600 | S_IFBLK, (7 << 8) | i);
if ((fd = open("/tmp/loop", O_RDONLY, 0)) >= 0) {
if (!ioctl(fd, LOOP_GET_STATUS, &li) && li.lo_name[0]) {
filesystems[numFilesystems].name = strdup(li.lo_name);
filesystems[numFilesystems].what = LOOP;
filesystems[numFilesystems].mounted = 1;
filesystems[numFilesystems].loopDevice = i;
numFilesystems++;
}
close(fd);
}
}
for (i = 0; i < numFilesystems; i++) {
if (filesystems[i].what == LOOP) {
undoLoop(filesystems, numFilesystems, i);
}
}
for (i = 0; i < numFilesystems; i++) {
if ((filesystems[i].mounted) && (filesystems[i].name)) {
undoMount(filesystems, numFilesystems, i);
}
}
for (i = 0; i < numFilesystems; i++)
free(filesystems[i].name);
}
void disableSwap(void) {
int fd;
char buf[4096];
int i;
char * start;
char * chptr;
if ((fd = open("/proc/swaps", O_RDONLY, 0)) < 0) return;
i = read(fd, buf, sizeof(buf) - 1);
close(fd);
if (i < 0) return;
buf[i] = '\0';
start = buf;
while (*start) {
while (*start != '\n' && *start) start++;
if (!*start) return;
start++;
if (*start != '/') return;
chptr = start;
while (*chptr && *chptr != ' ') chptr++;
if (!(*chptr)) return;
*chptr = '\0';
printf("\t%s", start);
if (swapoff(start))
printf(" failed (%d)", errno);
printf("\n");
start = chptr + 1;
}
}
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