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/*
FUSE: Filesystem in Userspace
Copyright (C) 2001 Miklos Szeredi (mszeredi@inf.bme.hu)
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
*/
#include "fuse_i.h"
#include <linux/fuse.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/mount.h>
#include <mntent.h>
static int do_mount(const char *dev, const char *dir, const char *type,
mode_t rootmode, int fd)
{
int res;
struct fuse_mount_data data;
data.version = FUSE_KERNEL_VERSION;
data.fd = fd;
data.rootmode = rootmode;
res = mount(dev, dir, type, MS_MGC_VAL | MS_NOSUID | MS_NODEV, &data);
if(res == -1) {
perror("mount failed");
return -1;
}
return 0;
}
static void add_mntent(const char *dev, const char *dir, const char *type)
{
int res;
FILE *fp;
struct mntent ent;
fp = setmntent("/etc/mtab", "a");
if(fp == NULL) {
perror("setmntent");
return;
}
ent.mnt_fsname = (char *) dev;
ent.mnt_dir = (char *) dir;
ent.mnt_type = (char *) type;
ent.mnt_opts = "rw,nosuid,nodev";
ent.mnt_freq = 0;
ent.mnt_passno = 0;
res = addmntent(fp, & ent);
if(res != 0)
perror("addmntent");
endmntent(fp);
}
static void remove_mntent(const char *dir)
{
int res;
FILE *fdold, *fdnew;
struct mntent *entp;
fdold = setmntent("/etc/mtab", "r");
if(fdold == NULL) {
perror("/etc/mtab");
return;
}
fdnew = setmntent("/etc/mtab~", "w");
if(fdnew == NULL) {
perror("/etc/mtab~");
return;
}
do {
entp = getmntent(fdold);
if(entp != NULL && strcmp(entp->mnt_dir, dir) != 0) {
res = addmntent(fdnew, entp);
if(res != 0)
perror("addmntent");
}
} while(entp != NULL);
endmntent(fdold);
endmntent(fdnew);
res = rename("/etc/mtab~", "/etc/mtab");
if(res == -1)
perror("renameing /etc/mtab~ to /etc/mtab");
}
int fuse_mount(struct fuse *f, const char *dir)
{
int res;
const char *dev = FUSE_DEV;
const char *type = "fuse";
if(f->mnt != NULL)
return 0;
f->fd = open(dev, O_RDWR);
if(f->fd == -1) {
perror(dev);
return -1;
}
res = do_mount(dev, dir, type, f->rootmode, f->fd);
if(res == -1)
return -1;
add_mntent(dev, dir, type);
f->mnt = g_strdup(dir);
return 0;
}
int fuse_unmount(struct fuse *f)
{
int res;
if(f->mnt == NULL)
return 0;
close(f->fd);
f->fd = -1;
res = umount(f->mnt);
if(res == -1)
perror("umount failed");
else
remove_mntent(f->mnt);
g_free(f->mnt);
f->mnt = NULL;
return res;
}
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