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>
  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)
  31 {
  32         Sector sect;
  33         unsigned char *data;
  34         int slot, blocks_in_map;
  35         unsigned secsize;
  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         data = read_part_sector(state, secsize/512, &sect);
  54         if (!data)
  55                 return -1;
  56         part = (struct mac_partition *) (data + secsize%512);
  57         if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
  58                 put_dev_sector(sect);
  59                 return 0;               /* not a MacOS disk */
  60         }
  61         blocks_in_map = be32_to_cpu(part->map_count);
  62         if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) {
  63                 put_dev_sector(sect);
  64                 return 0;
  65         }
  66
  67         if (blocks_in_map >= state->limit)
  68                 blocks_in_map = state->limit - 1;
  69
  70         strlcat(state->pp_buf, " [mac]", PAGE_SIZE);
  71         for (slot = 1; slot <= blocks_in_map; ++slot) {
  72                 int pos = slot * secsize;
  73                 put_dev_sector(sect);
  74                 data = read_part_sector(state, pos/512, &sect);
  75                 if (!data)
  76                         return -1;
  77                 part = (struct mac_partition *) (data + pos%512);
  78                 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
  79                         break;
  80                 put_partition(state, slot,
  81                         be32_to_cpu(part->start_block) * (secsize/512),
  82                         be32_to_cpu(part->block_count) * (secsize/512));
  83
  84                 if (!strnicmp(part->type, "Linux_RAID", 10))
  85                         state->parts[slot].flags = ADDPART_FLAG_RAID;
  86 #ifdef CONFIG_PPC_PMAC
  87                 /*
  88                  * If this is the first bootable partition, tell the
  89                  * setup code, in case it wants to make this the root.
  90                  */
  91                 if (machine_is(powermac)) {
  92                         int goodness = 0;
  93
  94                         mac_fix_string(part->processor, 16);
  95                         mac_fix_string(part->name, 32);
  96                         mac_fix_string(part->type, 32);
  97
  98                         if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
  99                             && strcasecmp(part->processor, "powerpc") == 0)
 100                                 goodness++;
 101
 102                         if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
 103                             || (strnicmp(part->type, "Linux", 5) == 0
 104                                 && strcasecmp(part->type, "Linux_swap") != 0)) {
 105                                 int i, l;
 106
 107                                 goodness++;
 108                                 l = strlen(part->name);
 109                                 if (strcmp(part->name, "/") == 0)
 110                                         goodness++;
 111                                 for (i = 0; i <= l - 4; ++i) {
 112                                         if (strnicmp(part->name + i, "root",
 113                                                      4) == 0) {
 114                                                 goodness += 2;
 115                                                 break;
 116                                         }
 117                                 }
 118                                 if (strnicmp(part->name, "swap", 4) == 0)
 119                                         goodness--;
 120                         }
 121
 122                         if (goodness > found_root_goodness) {
 123                                 found_root = slot;
 124                                 found_root_goodness = goodness;
 125                         }
 126                 }
 127 #endif /* CONFIG_PPC_PMAC */
 128         }
 129 #ifdef CONFIG_PPC_PMAC
 130         if (found_root_goodness)
 131                 note_bootable_part(state->bdev->bd_dev, found_root,
 132                                    found_root_goodness);
 133 #endif
 134
 135         put_dev_sector(sect);
 136         strlcat(state->pp_buf, "\n", PAGE_SIZE);
 137         return 1;
 138 }