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/*
* fs/partitions/amiga.c
*
* Code extracted from drivers/block/genhd.c
*
* Copyright (C) 1991-1998 Linus Torvalds
* Re-organised Feb 1998 Russell King
*/
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/blk.h>
#include <asm/byteorder.h>
#include <linux/affs_hardblocks.h>
#include "check.h"
#include "amiga.h"
static __inline__ u32
checksum_block(u32 *m, int size)
{
u32 sum = 0;
while (size--)
sum += be32_to_cpu(*m++);
return sum;
}
int
amiga_partition(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sector, int first_part_minor)
{
Sector sect;
unsigned char *data;
struct RigidDiskBlock *rdb;
struct PartitionBlock *pb;
int start_sect, nr_sects, blk, part, res = 0;
kdev_t dev = to_kdev_t(bdev->bd_dev);
for (blk = 0; ; blk++, put_dev_sector(sect)) {
if (blk == RDB_ALLOCATION_LIMIT)
goto rdb_done;
data = read_dev_sector(bdev, blk, §);
if (!data) {
if (warn_no_part)
printk("Dev %s: unable to read RDB block %d\n",
bdevname(dev), blk);
goto rdb_done;
}
if (*(u32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
continue;
rdb = (struct RigidDiskBlock *)data;
if (checksum_block((u32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
break;
/* Try again with 0xdc..0xdf zeroed, Windows might have
* trashed it.
*/
*(u32 *)(data+0xdc) = 0;
if (checksum_block((u32 *)data,
be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
printk("Warning: Trashed word at 0xd0 in block %d "
"ignored in checksum calculation\n",blk);
break;
}
printk("Dev %s: RDB in block %d has bad checksum\n",
bdevname(dev),blk);
}
printk(" RDSK");
blk = be32_to_cpu(rdb->rdb_PartitionList);
put_dev_sector(sect);
for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
data = read_dev_sector(bdev, blk, §);
if (!data) {
if (warn_no_part)
printk("Dev %s: unable to read partition block %d\n",
bdevname(dev),blk);
goto rdb_done;
}
pb = (struct PartitionBlock *)data;
blk = be32_to_cpu(pb->pb_Next);
if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
continue;
if (checksum_block((u32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
continue;
/* Tell Kernel about it */
nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
be32_to_cpu(pb->pb_Environment[9])) *
be32_to_cpu(pb->pb_Environment[3]) *
be32_to_cpu(pb->pb_Environment[5]);
if (!nr_sects)
continue;
start_sect = be32_to_cpu(pb->pb_Environment[9]) *
be32_to_cpu(pb->pb_Environment[3]) *
be32_to_cpu(pb->pb_Environment[5]);
add_gd_partition(hd,first_part_minor,start_sect,nr_sects);
first_part_minor++;
res = 1;
}
printk("\n");
rdb_done:
return res;
}
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