// SPDX-License-Identifier: GPL-2.0 /* * fs/partitions/amiga.c * * Code extracted from drivers/block/genhd.c * * Copyright (C) 1991-1998 Linus Torvalds * Re-organised Feb 1998 Russell King */ #define pr_fmt(fmt) fmt #include <linux/types.h> #include <linux/affs_hardblocks.h> #include "check.h" static __inline__ u32 checksum_block(__be32 *m, int size) { u32 sum = 0; while (size--) sum += be32_to_cpu(*m++); return sum; } int amiga_partition(struct parsed_partitions *state) { Sector sect; unsigned char *data; struct RigidDiskBlock *rdb; struct PartitionBlock *pb; int start_sect, nr_sects, blk, part, res = 0; int blksize = 1; /* Multiplier for disk block size */ int slot = 1; char b[BDEVNAME_SIZE]; for (blk = 0; ; blk++, put_dev_sector(sect)) { if (blk == RDB_ALLOCATION_LIMIT) goto rdb_done; data = read_part_sector(state, blk, §); if (!data) { pr_err("Dev %s: unable to read RDB block %d\n", bdevname(state->bdev, b), blk); res = -1; goto rdb_done; } if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK)) continue; rdb = (struct RigidDiskBlock *)data; if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0) break; /* Try again with 0xdc..0xdf zeroed, Windows might have * trashed it. */ *(__be32 *)(data+0xdc) = 0; if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) { pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n", blk); break; } pr_err("Dev %s: RDB in block %d has bad checksum\n", bdevname(state->bdev, b), blk); } /* blksize is blocks per 512 byte standard block */ blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512; { char tmp[7 + 10 + 1 + 1]; /* Be more informative */ snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512); strlcat(state->pp_buf, tmp, PAGE_SIZE); } blk = be32_to_cpu(rdb->rdb_PartitionList); put_dev_sector(sect); for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) { blk *= blksize; /* Read in terms partition table understands */ data = read_part_sector(state, blk, §); if (!data) { pr_err("Dev %s: unable to read partition block %d\n", bdevname(state->bdev, b), blk); res = -1; 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((__be32 *)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]) * blksize; 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]) * blksize; put_partition(state,slot++,start_sect,nr_sects); { /* Be even more informative to aid mounting */ char dostype[4]; char tmp[42]; __be32 *dt = (__be32 *)dostype; *dt = pb->pb_Environment[16]; if (dostype[3] < ' ') snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)", dostype[0], dostype[1], dostype[2], dostype[3] + '@' ); else snprintf(tmp, sizeof(tmp), " (%c%c%c%c)", dostype[0], dostype[1], dostype[2], dostype[3]); strlcat(state->pp_buf, tmp, PAGE_SIZE); snprintf(tmp, sizeof(tmp), "(res %d spb %d)", be32_to_cpu(pb->pb_Environment[6]), be32_to_cpu(pb->pb_Environment[4])); strlcat(state->pp_buf, tmp, PAGE_SIZE); } res = 1; } strlcat(state->pp_buf, "\n", PAGE_SIZE); rdb_done: return res; }