part.h

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2010 Neil Brown <neilb@suse.de>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neil@brown.name>
  23  *
  24  */
  25
  26 /* Structure definitions ext  for MBR and GPT partition tables
  27  */
  28
  29 #define MBR_SIGNATURE_MAGIC     __cpu_to_le16(0xAA55)
  30 #define MBR_PARTITIONS               4
  31
  32 struct MBR_part_record {
  33   __u8 bootable;
  34   __u8 first_head;
  35   __u8 first_sector;
  36   __u8 first_cyl;
  37   __u8 part_type;
  38   __u8 last_head;
  39   __u8 last_sector;
  40   __u8 last_cyl;
  41   __u32 first_sect_lba;
  42   __u32 blocks_num;
  43 };
  44
  45 struct MBR {
  46         __u8 pad[446];
  47         struct MBR_part_record parts[MBR_PARTITIONS];
  48         __u16 magic;
  49 } __attribute__((packed));
  50
  51 #define GPT_SIGNATURE_MAGIC     __cpu_to_le64(0x5452415020494645ULL)
  52 #define MBR_GPT_PARTITION_TYPE       0xEE
  53
  54 struct GPT_part_entry {
  55         unsigned char type_guid[16];
  56         unsigned char partition_guid[16];
  57         __u64 starting_lba;
  58         __u64 ending_lba;
  59         unsigned char attr_bits[8];
  60         unsigned char name[72];
  61 } __attribute__((packed));
  62
  63 struct GPT {
  64         __u64 magic;
  65         __u32 revision;
  66         __u32 header_size;
  67         __u32 crc;
  68         __u32 pad1;
  69         __u64 current_lba;
  70         __u64 backup_lba;
  71         __u64 first_lba;
  72         __u64 last_lba;
  73         __u8 guid[16];
  74         __u64 part_start;
  75         __u32 part_cnt;
  76         __u32 part_size;
  77         __u32 part_crc;
  78         __u8 pad2[420];
  79 } __attribute__((packed));