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, 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 }