static bool_t msdos_partition(struct disk_t * disk, size_t sector, size_t relative)
{
struct msdos_partition_mbr_t mbr;
struct partition_t * part;
size_t start;
int i;
if(!disk || !disk->name)
return FALSE;
if(!disk->size || !disk->count)
return FALSE;
if(disk_read(disk, (u8_t *)(&mbr), sector * disk->size, sizeof(struct msdos_partition_mbr_t)) != sizeof(struct msdos_partition_mbr_t))
return FALSE;
if((mbr.signature[0] != 0x55) || mbr.signature[1] != 0xaa)
return FALSE;
for(i = 0; i < 4; i++)
{
if((mbr.entry[i].type != 0) && (is_msdos_extended(mbr.entry[i].type)==FALSE))
{
part = malloc(sizeof(struct partition_t));
if(!part)
return FALSE;
strlcpy(part->name, "", sizeof(part->name));
part->from = sector + ((mbr.entry[i].start[3] << 24) | (mbr.entry[i].start[2] << 16) | (mbr.entry[i].start[1] << 8) | (mbr.entry[i].start[0] << 0));
part->to = part->from + ((mbr.entry[i].length[3] << 24) | (mbr.entry[i].length[2] << 16) | (mbr.entry[i].length[1] << 8) | (mbr.entry[i].length[0] << 0)) - 1;
part->size = disk->size;
list_add_tail(&part->entry, &(disk->part.entry));
}
}
for(i = 0; i < 4; i++)
{
if(is_msdos_extended(mbr.entry[i].type) == TRUE)
{
start = ((mbr.entry[i].start[3] << 24) | (mbr.entry[i].start[2] << 16) | (mbr.entry[i].start[1] << 8) | (mbr.entry[i].start[0] << 0)) + relative;
return msdos_partition(disk, start, (sector == 0) ? start : relative);
}
}
return TRUE;
}
static void check_partition(struct gendisk *hd, kdev_t dev)
{
static int first_time = 1;
unsigned long first_sector;
char buf[8];
if (first_time)
printk("Partition check:\n");
first_time = 0;
first_sector = hd->part[MINOR(dev)].start_sect;
/*
* This is a kludge to allow the partition check to be
* skipped for specific drives (e.g. IDE cd-rom drives)
*/
if ((int)first_sector == -1) {
hd->part[MINOR(dev)].start_sect = 0;
return;
}
printk(" %s:", disk_name(hd, MINOR(dev), buf));
#ifdef CONFIG_MSDOS_PARTITION
if (msdos_partition(hd, dev, first_sector))
return;
#endif
#ifdef CONFIG_OSF_PARTITION
if (osf_partition(hd, dev, first_sector))
return;
#endif
#ifdef CONFIG_SUN_PARTITION
if(sun_partition(hd, dev, first_sector))
return;
#endif
#ifdef CONFIG_AMIGA_PARTITION
if(amiga_partition(hd, dev, first_sector))
return;
#endif
printk(" unknown partition table\n");
}
static bool_t msdos_map(struct disk_t * disk)
{
return msdos_partition(disk, 0, 0);
}
