LXR linux/block/partitions/mac.c

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