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1275 |
phoenix |
/*
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* fs/partitions/sgi.c
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*
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* Code extracted from drivers/block/genhd.c
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*/
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#include <linux/fs.h>
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#include <linux/genhd.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/blk.h>
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#include <asm/byteorder.h>
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#include <asm/system.h>
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#include "check.h"
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#include "sgi.h"
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int sgi_partition(struct gendisk *hd, struct block_device *bdev, unsigned long first_sector, int current_minor)
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{
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int i, csum, magic;
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unsigned int *ui, start, blocks, cs;
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Sector sect;
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kdev_t dev = to_kdev_t(bdev->bd_dev);
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struct sgi_disklabel {
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int magic_mushroom; /* Big fat spliff... */
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short root_part_num; /* Root partition number */
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short swap_part_num; /* Swap partition number */
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char boot_file[16]; /* Name of boot file for ARCS */
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unsigned char _unused0[48]; /* Device parameter useless crapola.. */
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struct sgi_volume {
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char name[8]; /* Name of volume */
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int block_num; /* Logical block number */
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int num_bytes; /* How big, in bytes */
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} volume[15];
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struct sgi_partition {
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int num_blocks; /* Size in logical blocks */
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int first_block; /* First logical block */
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int type; /* Type of this partition */
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} partitions[16];
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int csum; /* Disk label checksum */
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int _unused1; /* Padding */
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} *label;
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struct sgi_partition *p;
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label = (struct sgi_disklabel *) read_dev_sector(bdev, 0, §);
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if (!label)
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return -1;
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p = &label->partitions[0];
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magic = label->magic_mushroom;
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if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
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/*printk("Dev %s SGI disklabel: bad magic %08x\n",
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bdevname(dev), magic);*/
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put_dev_sector(sect);
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return 0;
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}
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ui = ((unsigned int *) (label + 1)) - 1;
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for(csum = 0; ui >= ((unsigned int *) label);) {
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cs = *ui--;
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csum += be32_to_cpu(cs);
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}
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if(csum) {
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printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
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bdevname(dev));
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put_dev_sector(sect);
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return 0;
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}
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/* All SGI disk labels have 16 partitions, disks under Linux only
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* have 15 minor's. Luckily there are always a few zero length
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* partitions which we don't care about so we never overflow the
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* current_minor.
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*/
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for(i = 0; i < 16; i++, p++) {
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blocks = be32_to_cpu(p->num_blocks);
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start = be32_to_cpu(p->first_block);
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if(!blocks)
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continue;
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add_gd_partition(hd, current_minor, start, blocks);
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current_minor++;
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}
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printk("\n");
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put_dev_sector(sect);
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return 1;
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}
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