mac.c
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:2k
- /*
- * 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/config.h>
- #include <linux/fs.h>
- #include <linux/genhd.h>
- #include <linux/kernel.h>
- #include <linux/major.h>
- #include <linux/string.h>
- #include <linux/blk.h>
- #include <linux/ctype.h>
- #include <asm/system.h>
- #include "check.h"
- #include "mac.h"
- /*
- * Code to understand MacOS partition tables.
- */
- int mac_partition(struct gendisk *hd, struct block_device *bdev,
- unsigned long fsec, int first_part_minor)
- {
- Sector sect;
- unsigned char *data;
- int blk, blocks_in_map;
- unsigned secsize;
- 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, §);
- 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, §);
- 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, §);
- if (!data)
- return -1;
- part = (struct mac_partition *) (data + pos%512);
- if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
- break;
- add_gd_partition(hd, first_part_minor,
- fsec + be32_to_cpu(part->start_block) * (secsize/512),
- be32_to_cpu(part->block_count) * (secsize/512));
- ++first_part_minor;
- }
- put_dev_sector(sect);
- printk("n");
- return 1;
- }