fs/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/config.h>
  10 #include <linux/ctype.h>
  11 #include "check.h"
  12 #include "mac.h"
  13
  14 #ifdef CONFIG_PPC_PMAC
  15 extern void note_bootable_part(dev_t dev, int part, int goodness);
  16 #endif
  17
  18 /*
  19  * Code to understand MacOS partition tables.
  20  */
  21
  22 static 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
  30 int mac_partition(struct parsed_partitions *state, struct block_device *bdev)
  31 {
  32         int slot = 1;
  33         Sector sect;
  34         unsigned char *data;
  35         int blk, blocks_in_map;
  36         unsigned secsize;
  37 #ifdef CONFIG_PPC_PMAC
  38         int found_root = 0;
  39         int found_root_goodness = 0;
  40 #endif
  41         struct mac_partition *part;
  42         struct mac_driver_desc *md;
  43
  44         /* Get 0th block and look at the first partition map entry. */
  45         md = (struct mac_driver_desc *) read_dev_sector(bdev, 0, &sect);
  46         if (!md)
  47                 return -1;
  48         if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
  49                 put_dev_sector(sect);
  50                 return 0;
  51         }
  52         secsize = be16_to_cpu(md->block_size);
  53         put_dev_sector(sect);
  54         data = read_dev_sector(bdev, secsize/512, &sect);
  55         if (!data)
  56                 return -1;
  57         part = (struct mac_partition *) (data + secsize%512);
  58         if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
  59                 put_dev_sector(sect);
  60                 return 0;               /* not a MacOS disk */
  61         }
  62         printk(" [mac]");
  63         blocks_in_map = be32_to_cpu(part->map_count);
  64         for (blk = 1; blk <= blocks_in_map; ++blk) {
  65                 int pos = blk * secsize;
  66                 put_dev_sector(sect);
  67                 data = read_dev_sector(bdev, pos/512, &sect);
  68                 if (!data)
  69                         return -1;
  70                 part = (struct mac_partition *) (data + pos%512);
  71                 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
  72                         break;
  73                 put_partition(state, slot,
  74                         be32_to_cpu(part->start_block) * (secsize/512),
  75                         be32_to_cpu(part->block_count) * (secsize/512));
  76
  77 #ifdef CONFIG_PPC_PMAC
  78                 /*
  79                  * If this is the first bootable partition, tell the
  80                  * setup code, in case it wants to make this the root.
  81                  */
  82                 if (_machine == _MACH_Pmac) {
  83                         int goodness = 0;
  84
  85                         mac_fix_string(part->processor, 16);
  86                         mac_fix_string(part->name, 32);
  87                         mac_fix_string(part->type, 32);
  88
  89                         if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
  90                             && strcasecmp(part->processor, "powerpc") == 0)
  91                                 goodness++;
  92
  93                         if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
  94                             || (strnicmp(part->type, "Linux", 5) == 0
  95                                 && strcasecmp(part->type, "Linux_swap") != 0)) {
  96                                 int i, l;
  97
  98                                 goodness++;
  99                                 l = strlen(part->name);
 100                                 if (strcmp(part->name, "/") == 0)
 101                                         goodness++;
 102                                 for (i = 0; i <= l - 4; ++i) {
 103                                         if (strnicmp(part->name + i, "root",
 104                                                      4) == 0) {
 105                                                 goodness += 2;
 106                                                 break;
 107                                         }
 108                                 }
 109                                 if (strnicmp(part->name, "swap", 4) == 0)
 110                                         goodness--;
 111                         }
 112
 113                         if (goodness > found_root_goodness) {
 114                                 found_root = blk;
 115                                 found_root_goodness = goodness;
 116                         }
 117                 }
 118 #endif /* CONFIG_PPC_PMAC */
 119
 120                 ++slot;
 121         }
 122 #ifdef CONFIG_PPC_PMAC
 123         if (found_root_goodness)
 124                 note_bootable_part(bdev->bd_dev, found_root, found_root_goodness);
 125 #endif
 126
 127         put_dev_sector(sect);
 128         printk("\n");
 129         return 1;
 130 }