131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
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* fs/partitions/amiga.c
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*
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* Code extracted from drivers/block/genhd.c
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*
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* Copyright (C) 1991-1998 Linus Torvalds
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* Re-organised Feb 1998 Russell King
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*/
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#include <linux/types.h>
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#include <linux/affs_hardblocks.h>
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#include "check.h"
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#include "amiga.h"
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static __inline__ u32
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checksum_block(__be32 *m, int size)
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{
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u32 sum = 0;
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while (size--)
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sum += be32_to_cpu(*m++);
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return sum;
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}
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int
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amiga_partition(struct parsed_partitions *state, struct block_device *bdev)
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{
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Sector sect;
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unsigned char *data;
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struct RigidDiskBlock *rdb;
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struct PartitionBlock *pb;
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int start_sect, nr_sects, blk, part, res = 0;
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int blksize = 1; /* Multiplier for disk block size */
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int slot = 1;
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char b[BDEVNAME_SIZE];
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for (blk = 0; ; blk++, put_dev_sector(sect)) {
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if (blk == RDB_ALLOCATION_LIMIT)
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goto rdb_done;
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data = read_dev_sector(bdev, blk, §);
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if (!data) {
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if (warn_no_part)
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printk("Dev %s: unable to read RDB block %d\n",
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bdevname(bdev, b), blk);
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res = -1;
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goto rdb_done;
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}
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if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
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continue;
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rdb = (struct RigidDiskBlock *)data;
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if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
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break;
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/* Try again with 0xdc..0xdf zeroed, Windows might have
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* trashed it.
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*/
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*(__be32 *)(data+0xdc) = 0;
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if (checksum_block((__be32 *)data,
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be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
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printk("Warning: Trashed word at 0xd0 in block %d "
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"ignored in checksum calculation\n",blk);
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break;
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}
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printk("Dev %s: RDB in block %d has bad checksum\n",
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bdevname(bdev, b), blk);
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}
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/* blksize is blocks per 512 byte standard block */
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blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
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printk(" RDSK (%d)", blksize * 512); /* Be more informative */
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blk = be32_to_cpu(rdb->rdb_PartitionList);
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put_dev_sector(sect);
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for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
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blk *= blksize; /* Read in terms partition table understands */
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data = read_dev_sector(bdev, blk, §);
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if (!data) {
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if (warn_no_part)
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printk("Dev %s: unable to read partition block %d\n",
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bdevname(bdev, b), blk);
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res = -1;
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goto rdb_done;
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}
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pb = (struct PartitionBlock *)data;
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blk = be32_to_cpu(pb->pb_Next);
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if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
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continue;
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if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
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continue;
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/* Tell Kernel about it */
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nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
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be32_to_cpu(pb->pb_Environment[9])) *
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be32_to_cpu(pb->pb_Environment[3]) *
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be32_to_cpu(pb->pb_Environment[5]) *
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blksize;
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if (!nr_sects)
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continue;
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start_sect = be32_to_cpu(pb->pb_Environment[9]) *
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be32_to_cpu(pb->pb_Environment[3]) *
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be32_to_cpu(pb->pb_Environment[5]) *
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blksize;
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put_partition(state,slot++,start_sect,nr_sects);
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{
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/* Be even more informative to aid mounting */
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char dostype[4];
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__be32 *dt = (__be32 *)dostype;
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*dt = pb->pb_Environment[16];
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if (dostype[3] < ' ')
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printk(" (%c%c%c^%c)",
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dostype[0], dostype[1],
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dostype[2], dostype[3] + '@' );
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else
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printk(" (%c%c%c%c)",
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dostype[0], dostype[1],
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dostype[2], dostype[3]);
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printk("(res %d spb %d)",
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be32_to_cpu(pb->pb_Environment[6]),
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be32_to_cpu(pb->pb_Environment[4]));
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}
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res = 1;
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}
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printk("\n");
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rdb_done:
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return res;
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}
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