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/* ----------------------------------------------------------------------- *
*
* Copyright 2010 Intel Corp. - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Boston MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* syslxcom.c
*
* common functions for extlinux & syslinux installer
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/vfs.h>
#include <linux/fs.h> /* FIGETBSZ, FIBMAP */
#include <linux/msdos_fs.h> /* FAT_IOCTL_SET_ATTRIBUTES */
#include "syslxcom.h"
const char *program;
int fs_type;
#ifdef DEBUG
# define dprintf printf
#else
# define dprintf(...) ((void)0)
#endif
#define SECTOR_SHIFT 9
#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
/*
* ioctl commands
*/
#define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
#define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
#define EXT2_IOC_SETVERSION _IOW('v', 2, long)
static void die(const char *msg)
{
fputs(msg, stderr);
exit(1);
}
/*
* read/write wrapper functions
*/
ssize_t xpread(int fd, void *buf, size_t count, off_t offset)
{
char *bufp = (char *)buf;
ssize_t rv;
ssize_t done = 0;
while (count) {
rv = pread(fd, bufp, count, offset);
if (rv == 0) {
die("short read");
} else if (rv == -1) {
if (errno == EINTR) {
continue;
} else {
die(strerror(errno));
}
} else {
bufp += rv;
offset += rv;
done += rv;
count -= rv;
}
}
return done;
}
ssize_t xpwrite(int fd, const void *buf, size_t count, off_t offset)
{
const char *bufp = (const char *)buf;
ssize_t rv;
ssize_t done = 0;
while (count) {
rv = pwrite(fd, bufp, count, offset);
if (rv == 0) {
die("short write");
} else if (rv == -1) {
if (errno == EINTR) {
continue;
} else {
die(strerror(errno));
}
} else {
bufp += rv;
offset += rv;
done += rv;
count -= rv;
}
}
return done;
}
/*
* Set and clear file attributes
*/
void clear_attributes(int fd)
{
struct stat st;
if (!fstat(fd, &st)) {
switch (fs_type) {
case EXT2:
{
int flags;
if (!ioctl(fd, EXT2_IOC_GETFLAGS, &flags)) {
flags &= ~EXT2_IMMUTABLE_FL;
ioctl(fd, EXT2_IOC_SETFLAGS, &flags);
}
break;
}
case VFAT:
{
uint32_t attr = 0x00; /* Clear all attributes */
ioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &attr);
break;
}
default:
break;
}
fchmod(fd, st.st_mode | S_IWUSR);
}
}
void set_attributes(int fd)
{
struct stat st;
if (!fstat(fd, &st)) {
fchmod(fd, st.st_mode & (S_IRUSR | S_IRGRP | S_IROTH));
switch (fs_type) {
case EXT2:
{
int flags;
if (st.st_uid == 0 && !ioctl(fd, EXT2_IOC_GETFLAGS, &flags)) {
flags |= EXT2_IMMUTABLE_FL;
ioctl(fd, EXT2_IOC_SETFLAGS, &flags);
}
break;
}
case VFAT:
{
uint32_t attr = 0x07; /* Hidden+System+Readonly */
ioctl(fd, FAT_IOCTL_SET_ATTRIBUTES, &attr);
break;
}
default:
break;
}
}
}
/*
* Produce file map
*/
int sectmap(int fd, uint32_t * sectors, int nsectors)
{
unsigned int blksize, blk, nblk;
unsigned int i;
/* Get block size */
if (ioctl(fd, FIGETBSZ, &blksize))
return -1;
/* Number of sectors per block */
blksize >>= SECTOR_SHIFT;
nblk = 0;
while (nsectors) {
blk = nblk++;
dprintf("querying block %u\n", blk);
if (ioctl(fd, FIBMAP, &blk))
return -1;
blk *= blksize;
for (i = 0; i < blksize; i++) {
if (!nsectors)
return 0;
dprintf("Sector: %10u\n", blk);
*sectors++ = blk++;
nsectors--;
}
}
return 0;
}
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