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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [partitions/] [ultrix.c] - Rev 1275
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/* * fs/partitions/ultrix.c * * Code extracted from drivers/block/genhd.c * * Re-organised Jul 1999 Russell King */ #include <linux/fs.h> #include <linux/genhd.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/blk.h> #include "check.h" int ultrix_partition(struct gendisk *hd, struct block_device *bdev, unsigned long first_sector, int first_part_minor) { int i; Sector sect; unsigned char *data; struct ultrix_disklabel { s32 pt_magic; /* magic no. indicating part. info exits */ s32 pt_valid; /* set by driver if pt is current */ struct pt_info { s32 pi_nblocks; /* no. of sectors */ u32 pi_blkoff; /* block offset for start */ } pt_part[8]; } *label; #define PT_MAGIC 0x032957 /* Partition magic number */ #define PT_VALID 1 /* Indicates if struct is valid */ data = read_dev_sector(bdev, (16384 - sizeof(*label))/512, §); if (!data) return -1; label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label)); if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) { for (i=0; i<8; i++, first_part_minor++) if (label->pt_part[i].pi_nblocks) add_gd_partition(hd, first_part_minor, label->pt_part[i].pi_blkoff, label->pt_part[i].pi_nblocks); put_dev_sector(sect); printk ("\n"); return 1; } else { put_dev_sector(sect); return 0; } }
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