root/fs/partitions/mac.c

DEFINITIONS

1. mac_fix_string
2. mac_partition

/*
 *  fs/partitions/mac.c
 *
 *  Code extracted from drivers/block/genhd.c
 *  Copyright (C) 1991-1998  Linus Torvalds
 *  Re-organised Feb 1998 Russell King
 */

#include <linux/ctype.h>
#include "check.h"
#include "mac.h"

#ifdef CONFIG_PPC_PMAC
#include <asm/machdep.h>
extern void note_bootable_part(dev_t dev, int part, int goodness);
#endif

/*
 * Code to understand MacOS partition tables.
 */

static inline void mac_fix_string(char *stg, int len)
{
        int i;

        for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
                stg[i] = 0;
}

int mac_partition(struct parsed_partitions *state, struct block_device *bdev)
{
        int slot = 1;
        Sector sect;
        unsigned char *data;
        int blk, blocks_in_map;
        unsigned secsize;
#ifdef CONFIG_PPC_PMAC
        int found_root = 0;
        int found_root_goodness = 0;
#endif
        struct mac_partition *part;
        struct mac_driver_desc *md;

        /* Get 0th block and look at the first partition map entry. */
        md = (struct mac_driver_desc *) read_dev_sector(bdev, 0, &sect);
        if (!md)
                return -1;
        if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
                put_dev_sector(sect);
                return 0;
        }
        secsize = be16_to_cpu(md->block_size);
        put_dev_sector(sect);
        data = read_dev_sector(bdev, secsize/512, &sect);
        if (!data)
                return -1;
        part = (struct mac_partition *) (data + secsize%512);
        if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
                put_dev_sector(sect);
                return 0;               /* not a MacOS disk */
        }
        printk(" [mac]");
        blocks_in_map = be32_to_cpu(part->map_count);
        for (blk = 1; blk <= blocks_in_map; ++blk) {
                int pos = blk * secsize;
                put_dev_sector(sect);
                data = read_dev_sector(bdev, pos/512, &sect);
                if (!data)
                        return -1;
                part = (struct mac_partition *) (data + pos%512);
                if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
                        break;
                put_partition(state, slot,
                        be32_to_cpu(part->start_block) * (secsize/512),
                        be32_to_cpu(part->block_count) * (secsize/512));

                if (!strnicmp(part->type, "Linux_RAID", 10))
                        state->parts[slot].flags = 1;
#ifdef CONFIG_PPC_PMAC
                /*
                 * If this is the first bootable partition, tell the
                 * setup code, in case it wants to make this the root.
                 */
                if (machine_is(powermac)) {
                        int goodness = 0;

                        mac_fix_string(part->processor, 16);
                        mac_fix_string(part->name, 32);
                        mac_fix_string(part->type, 32);                                 
                    
                        if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
                            && strcasecmp(part->processor, "powerpc") == 0)
                                goodness++;

                        if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
                            || (strnicmp(part->type, "Linux", 5) == 0
                                && strcasecmp(part->type, "Linux_swap") != 0)) {
                                int i, l;

                                goodness++;
                                l = strlen(part->name);
                                if (strcmp(part->name, "/") == 0)
                                        goodness++;
                                for (i = 0; i <= l - 4; ++i) {
                                        if (strnicmp(part->name + i, "root",
                                                     4) == 0) {
                                                goodness += 2;
                                                break;
                                        }
                                }
                                if (strnicmp(part->name, "swap", 4) == 0)
                                        goodness--;
                        }

                        if (goodness > found_root_goodness) {
                                found_root = blk;
                                found_root_goodness = goodness;
                        }
                }
#endif /* CONFIG_PPC_PMAC */

                ++slot;
        }
#ifdef CONFIG_PPC_PMAC
        if (found_root_goodness)
                note_bootable_part(bdev->bd_dev, found_root, found_root_goodness);
#endif

        put_dev_sector(sect);
        printk("\n");
        return 1;
}