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 18 static __inline__ u32 19 checksum_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 28 int 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, §); 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, §); 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); 138 139 rdb_done: 140 return res; 141 } 142