[PATCH] Enable RAID autorun on Mac partition tables.
[linux-2.6.git] / 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/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, 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                 if (!strnicmp(part->type, "Linux_RAID", 10))
78                         state->parts[slot].flags = 1;
79 #ifdef CONFIG_PPC_PMAC
80                 /*
81                  * If this is the first bootable partition, tell the
82                  * setup code, in case it wants to make this the root.
83                  */
84                 if (machine_is(powermac)) {
85                         int goodness = 0;
86
87                         mac_fix_string(part->processor, 16);
88                         mac_fix_string(part->name, 32);
89                         mac_fix_string(part->type, 32);                                 
90                     
91                         if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
92                             && strcasecmp(part->processor, "powerpc") == 0)
93                                 goodness++;
94
95                         if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
96                             || (strnicmp(part->type, "Linux", 5) == 0
97                                 && strcasecmp(part->type, "Linux_swap") != 0)) {
98                                 int i, l;
99
100                                 goodness++;
101                                 l = strlen(part->name);
102                                 if (strcmp(part->name, "/") == 0)
103                                         goodness++;
104                                 for (i = 0; i <= l - 4; ++i) {
105                                         if (strnicmp(part->name + i, "root",
106                                                      4) == 0) {
107                                                 goodness += 2;
108                                                 break;
109                                         }
110                                 }
111                                 if (strnicmp(part->name, "swap", 4) == 0)
112                                         goodness--;
113                         }
114
115                         if (goodness > found_root_goodness) {
116                                 found_root = blk;
117                                 found_root_goodness = goodness;
118                         }
119                 }
120 #endif /* CONFIG_PPC_PMAC */
121
122                 ++slot;
123         }
124 #ifdef CONFIG_PPC_PMAC
125         if (found_root_goodness)
126                 note_bootable_part(bdev->bd_dev, found_root, found_root_goodness);
127 #endif
128
129         put_dev_sector(sect);
130         printk("\n");
131         return 1;
132 }