osf.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:2k
- /*
- * fs/partitions/osf.c
- *
- * Code extracted from drivers/block/genhd.c
- *
- * Copyright (C) 1991-1998 Linus Torvalds
- * Re-organised Feb 1998 Russell King
- */
- #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 "check.h"
- #include "osf.h"
- int osf_partition(struct gendisk *hd, struct block_device *bdev,
- unsigned long first_sector, int current_minor)
- {
- int i;
- Sector sect;
- unsigned char *data;
- int mask = (1 << hd->minor_shift) - 1;
- struct disklabel {
- u32 d_magic;
- u16 d_type,d_subtype;
- u8 d_typename[16];
- u8 d_packname[16];
- u32 d_secsize;
- u32 d_nsectors;
- u32 d_ntracks;
- u32 d_ncylinders;
- u32 d_secpercyl;
- u32 d_secprtunit;
- u16 d_sparespertrack;
- u16 d_sparespercyl;
- u32 d_acylinders;
- u16 d_rpm, d_interleave, d_trackskew, d_cylskew;
- u32 d_headswitch, d_trkseek, d_flags;
- u32 d_drivedata[5];
- u32 d_spare[5];
- u32 d_magic2;
- u16 d_checksum;
- u16 d_npartitions;
- u32 d_bbsize, d_sbsize;
- struct d_partition {
- u32 p_size;
- u32 p_offset;
- u32 p_fsize;
- u8 p_fstype;
- u8 p_frag;
- u16 p_cpg;
- } d_partitions[8];
- } * label;
- struct d_partition * partition;
- data = read_dev_sector(bdev, 0, §);
- if (!data)
- return -1;
- label = (struct disklabel *) (data+64);
- partition = label->d_partitions;
- if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
- put_dev_sector(sect);
- return 0;
- }
- if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
- put_dev_sector(sect);
- return 0;
- }
- for (i = 0 ; i < le16_to_cpu(label->d_npartitions); i++, partition++) {
- if ((current_minor & mask) == 0)
- break;
- if (le32_to_cpu(partition->p_size))
- add_gd_partition(hd, current_minor,
- first_sector+le32_to_cpu(partition->p_offset),
- le32_to_cpu(partition->p_size));
- current_minor++;
- }
- printk("n");
- put_dev_sector(sect);
- return 1;
- }