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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | // SPDX-License-Identifier: GPL-2.0 /* * fs/partitions/mac.c * * Code extracted from drivers/block/genhd.c * Copyright (C) 1991-1998 Linus Torvalds * Re-organised Feb 1998 Russell King */ #include <linux/ctype.h> #include "check.h" #include "mac.h" #ifdef CONFIG_PPC_PMAC #include <asm/machdep.h> extern void note_bootable_part(dev_t dev, int part, int goodness); #endif /* * Code to understand MacOS partition tables. */ static inline void mac_fix_string(char *stg, int len) { int i; for (i = len - 1; i >= 0 && stg[i] == ' '; i--) stg[i] = 0; } int mac_partition(struct parsed_partitions *state) { Sector sect; unsigned char *data; int slot, blocks_in_map; unsigned secsize, datasize, partoffset; #ifdef CONFIG_PPC_PMAC int found_root = 0; int found_root_goodness = 0; #endif struct mac_partition *part; struct mac_driver_desc *md; /* Get 0th block and look at the first partition map entry. */ md = read_part_sector(state, 0, §); if (!md) return -1; if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) { put_dev_sector(sect); return 0; } secsize = be16_to_cpu(md->block_size); put_dev_sector(sect); datasize = round_down(secsize, 512); data = read_part_sector(state, datasize / 512, §); if (!data) return -1; partoffset = secsize % 512; if (partoffset + sizeof(*part) > datasize) return -1; part = (struct mac_partition *) (data + partoffset); if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) { put_dev_sector(sect); return 0; /* not a MacOS disk */ } blocks_in_map = be32_to_cpu(part->map_count); if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) { put_dev_sector(sect); return 0; } if (blocks_in_map >= state->limit) blocks_in_map = state->limit - 1; strlcat(state->pp_buf, " [mac]", PAGE_SIZE); for (slot = 1; slot <= blocks_in_map; ++slot) { int pos = slot * secsize; put_dev_sector(sect); data = read_part_sector(state, pos/512, §); if (!data) return -1; part = (struct mac_partition *) (data + pos%512); if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) break; put_partition(state, slot, be32_to_cpu(part->start_block) * (secsize/512), be32_to_cpu(part->block_count) * (secsize/512)); if (!strncasecmp(part->type, "Linux_RAID", 10)) state->parts[slot].flags = ADDPART_FLAG_RAID; #ifdef CONFIG_PPC_PMAC /* * If this is the first bootable partition, tell the * setup code, in case it wants to make this the root. */ if (machine_is(powermac)) { int goodness = 0; mac_fix_string(part->processor, 16); mac_fix_string(part->name, 32); mac_fix_string(part->type, 32); if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE) && strcasecmp(part->processor, "powerpc") == 0) goodness++; if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0 || (strncasecmp(part->type, "Linux", 5) == 0 && strcasecmp(part->type, "Linux_swap") != 0)) { int i, l; goodness++; l = strlen(part->name); if (strcmp(part->name, "/") == 0) goodness++; for (i = 0; i <= l - 4; ++i) { if (strncasecmp(part->name + i, "root", 4) == 0) { goodness += 2; break; } } if (strncasecmp(part->name, "swap", 4) == 0) goodness--; } if (goodness > found_root_goodness) { found_root = slot; found_root_goodness = goodness; } } #endif /* CONFIG_PPC_PMAC */ } #ifdef CONFIG_PPC_PMAC if (found_root_goodness) note_bootable_part(state->bdev->bd_dev, found_root, found_root_goodness); #endif put_dev_sector(sect); strlcat(state->pp_buf, "\n", PAGE_SIZE); return 1; } |