LXR linux/block/partitions/amiga.c

   1/*
   2 *  fs/partitions/amiga.c
   3 *
   4 *  Code extracted from drivers/block/genhd.c
   5 *
   6 *  Copyright (C) 1991-1998  Linus Torvalds
   7 *  Re-organised Feb 1998 Russell King
   8 */
   9
  10#define pr_fmt(fmt) fmt
  11
  12#include <linux/types.h>
  13#include <linux/affs_hardblocks.h>
  14
  15#include "check.h"
  16#include "amiga.h"
  17
  18static __inline__ u32
  19checksum_block(__be32 *m, int size)
  20{
  21        u32 sum = 0;
  22
  23        while (size--)
  24                sum += be32_to_cpu(*m++);
  25        return sum;
  26}
  27
  28int amiga_partition(struct parsed_partitions *state)
  29{
  30        Sector sect;
  31        unsigned char *data;
  32        struct RigidDiskBlock *rdb;
  33        struct PartitionBlock *pb;
  34        int start_sect, nr_sects, blk, part, res = 0;
  35        int blksize = 1;        /* Multiplier for disk block size */
  36        int slot = 1;
  37        char b[BDEVNAME_SIZE];
  38
  39        for (blk = 0; ; blk++, put_dev_sector(sect)) {
  40                if (blk == RDB_ALLOCATION_LIMIT)
  41                        goto rdb_done;
  42                data = read_part_sector(state, blk, &sect);
  43                if (!data) {
  44                        if (warn_no_part)
  45                                pr_err("Dev %s: unable to read RDB block %d\n",
  46                                       bdevname(state->bdev, b), blk);
  47                        res = -1;
  48                        goto rdb_done;
  49                }
  50                if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
  51                        continue;
  52
  53                rdb = (struct RigidDiskBlock *)data;
  54                if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
  55                        break;
  56                /* Try again with 0xdc..0xdf zeroed, Windows might have
  57                 * trashed it.
  58                 */
  59                *(__be32 *)(data+0xdc) = 0;
  60                if (checksum_block((__be32 *)data,
  61                                be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
  62                        pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n",
  63                               blk);
  64                        break;
  65                }
  66
  67                pr_err("Dev %s: RDB in block %d has bad checksum\n",
  68                       bdevname(state->bdev, b), blk);
  69        }
  70
  71        /* blksize is blocks per 512 byte standard block */
  72        blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
  73
  74        {
  75                char tmp[7 + 10 + 1 + 1];
  76
  77                /* Be more informative */
  78                snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
  79                strlcat(state->pp_buf, tmp, PAGE_SIZE);
  80        }
  81        blk = be32_to_cpu(rdb->rdb_PartitionList);
  82        put_dev_sector(sect);
  83        for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
  84                blk *= blksize; /* Read in terms partition table understands */
  85                data = read_part_sector(state, blk, &sect);
  86                if (!data) {
  87                        if (warn_no_part)
  88                                pr_err("Dev %s: unable to read partition block %d\n",
  89                                       bdevname(state->bdev, b), blk);
  90                        res = -1;
  91                        goto rdb_done;
  92                }
  93                pb  = (struct PartitionBlock *)data;
  94                blk = be32_to_cpu(pb->pb_Next);
  95                if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
  96                        continue;
  97                if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
  98                        continue;
  99
 100                /* Tell Kernel about it */
 101
 102                nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
 103                            be32_to_cpu(pb->pb_Environment[9])) *
 104                           be32_to_cpu(pb->pb_Environment[3]) *
 105                           be32_to_cpu(pb->pb_Environment[5]) *
 106                           blksize;
 107                if (!nr_sects)
 108                        continue;
 109                start_sect = be32_to_cpu(pb->pb_Environment[9]) *
 110                             be32_to_cpu(pb->pb_Environment[3]) *
 111                             be32_to_cpu(pb->pb_Environment[5]) *
 112                             blksize;
 113                put_partition(state,slot++,start_sect,nr_sects);
 114                {
 115                        /* Be even more informative to aid mounting */
 116                        char dostype[4];
 117                        char tmp[42];
 118
 119                        __be32 *dt = (__be32 *)dostype;
 120                        *dt = pb->pb_Environment[16];
 121                        if (dostype[3] < ' ')
 122                                snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
 123                                        dostype[0], dostype[1],
 124                                        dostype[2], dostype[3] + '@' );
 125                        else
 126                                snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
 127                                        dostype[0], dostype[1],
 128                                        dostype[2], dostype[3]);
 129                        strlcat(state->pp_buf, tmp, PAGE_SIZE);
 130                        snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
 131                                be32_to_cpu(pb->pb_Environment[6]),
 132                                be32_to_cpu(pb->pb_Environment[4]));
 133                        strlcat(state->pp_buf, tmp, PAGE_SIZE);
 134                }
 135                res = 1;
 136        }
 137        strlcat(state->pp_buf, "\n", PAGE_SIZE);
 138
 139rdb_done:
 140        return res;
 141}
 142