linux/block/partitions/ldm.h
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   1/**
   2 * ldm - Part of the Linux-NTFS project.
   3 *
   4 * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
   5 * Copyright (c) 2001-2007 Anton Altaparmakov
   6 * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
   7 *
   8 * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads 
   9 *
  10 * This program is free software; you can redistribute it and/or modify it
  11 * under the terms of the GNU General Public License as published by the Free
  12 * Software Foundation; either version 2 of the License, or (at your option)
  13 * any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program (in the main directory of the Linux-NTFS source
  22 * in the file COPYING); if not, write to the Free Software Foundation,
  23 * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24 */
  25
  26#ifndef _FS_PT_LDM_H_
  27#define _FS_PT_LDM_H_
  28
  29#include <linux/types.h>
  30#include <linux/list.h>
  31#include <linux/genhd.h>
  32#include <linux/fs.h>
  33#include <asm/unaligned.h>
  34#include <asm/byteorder.h>
  35
  36struct parsed_partitions;
  37
  38/* Magic numbers in CPU format. */
  39#define MAGIC_VMDB      0x564D4442              /* VMDB */
  40#define MAGIC_VBLK      0x56424C4B              /* VBLK */
  41#define MAGIC_PRIVHEAD  0x5052495648454144ULL   /* PRIVHEAD */
  42#define MAGIC_TOCBLOCK  0x544F43424C4F434BULL   /* TOCBLOCK */
  43
  44/* The defined vblk types. */
  45#define VBLK_VOL5               0x51            /* Volume,     version 5 */
  46#define VBLK_CMP3               0x32            /* Component,  version 3 */
  47#define VBLK_PRT3               0x33            /* Partition,  version 3 */
  48#define VBLK_DSK3               0x34            /* Disk,       version 3 */
  49#define VBLK_DSK4               0x44            /* Disk,       version 4 */
  50#define VBLK_DGR3               0x35            /* Disk Group, version 3 */
  51#define VBLK_DGR4               0x45            /* Disk Group, version 4 */
  52
  53/* vblk flags indicating extra information will be present */
  54#define VBLK_FLAG_COMP_STRIPE   0x10
  55#define VBLK_FLAG_PART_INDEX    0x08
  56#define VBLK_FLAG_DGR3_IDS      0x08
  57#define VBLK_FLAG_DGR4_IDS      0x08
  58#define VBLK_FLAG_VOLU_ID1      0x08
  59#define VBLK_FLAG_VOLU_ID2      0x20
  60#define VBLK_FLAG_VOLU_SIZE     0x80
  61#define VBLK_FLAG_VOLU_DRIVE    0x02
  62
  63/* size of a vblk's static parts */
  64#define VBLK_SIZE_HEAD          16
  65#define VBLK_SIZE_CMP3          22              /* Name and version */
  66#define VBLK_SIZE_DGR3          12
  67#define VBLK_SIZE_DGR4          44
  68#define VBLK_SIZE_DSK3          12
  69#define VBLK_SIZE_DSK4          45
  70#define VBLK_SIZE_PRT3          28
  71#define VBLK_SIZE_VOL5          58
  72
  73/* component types */
  74#define COMP_STRIPE             0x01            /* Stripe-set */
  75#define COMP_BASIC              0x02            /* Basic disk */
  76#define COMP_RAID               0x03            /* Raid-set */
  77
  78/* Other constants. */
  79#define LDM_DB_SIZE             2048            /* Size in sectors (= 1MiB). */
  80
  81#define OFF_PRIV1               6               /* Offset of the first privhead
  82                                                   relative to the start of the
  83                                                   device in sectors */
  84
  85/* Offsets to structures within the LDM Database in sectors. */
  86#define OFF_PRIV2               1856            /* Backup private headers. */
  87#define OFF_PRIV3               2047
  88
  89#define OFF_TOCB1               1               /* Tables of contents. */
  90#define OFF_TOCB2               2
  91#define OFF_TOCB3               2045
  92#define OFF_TOCB4               2046
  93
  94#define OFF_VMDB                17              /* List of partitions. */
  95
  96#define LDM_PARTITION           0x42            /* Formerly SFS (Landis). */
  97
  98#define TOC_BITMAP1             "config"        /* Names of the two defined */
  99#define TOC_BITMAP2             "log"           /* bitmaps in the TOCBLOCK. */
 100
 101/* Borrowed from msdos.c */
 102#define SYS_IND(p)              (get_unaligned(&(p)->sys_ind))
 103
 104struct frag {                           /* VBLK Fragment handling */
 105        struct list_head list;
 106        u32             group;
 107        u8              num;            /* Total number of records */
 108        u8              rec;            /* This is record number n */
 109        u8              map;            /* Which portions are in use */
 110        u8              data[0];
 111};
 112
 113/* In memory LDM database structures. */
 114
 115#define GUID_SIZE               16
 116
 117struct privhead {                       /* Offsets and sizes are in sectors. */
 118        u16     ver_major;
 119        u16     ver_minor;
 120        u64     logical_disk_start;
 121        u64     logical_disk_size;
 122        u64     config_start;
 123        u64     config_size;
 124        u8      disk_id[GUID_SIZE];
 125};
 126
 127struct tocblock {                       /* We have exactly two bitmaps. */
 128        u8      bitmap1_name[16];
 129        u64     bitmap1_start;
 130        u64     bitmap1_size;
 131        u8      bitmap2_name[16];
 132        u64     bitmap2_start;
 133        u64     bitmap2_size;
 134};
 135
 136struct vmdb {                           /* VMDB: The database header */
 137        u16     ver_major;
 138        u16     ver_minor;
 139        u32     vblk_size;
 140        u32     vblk_offset;
 141        u32     last_vblk_seq;
 142};
 143
 144struct vblk_comp {                      /* VBLK Component */
 145        u8      state[16];
 146        u64     parent_id;
 147        u8      type;
 148        u8      children;
 149        u16     chunksize;
 150};
 151
 152struct vblk_dgrp {                      /* VBLK Disk Group */
 153        u8      disk_id[64];
 154};
 155
 156struct vblk_disk {                      /* VBLK Disk */
 157        u8      disk_id[GUID_SIZE];
 158        u8      alt_name[128];
 159};
 160
 161struct vblk_part {                      /* VBLK Partition */
 162        u64     start;
 163        u64     size;                   /* start, size and vol_off in sectors */
 164        u64     volume_offset;
 165        u64     parent_id;
 166        u64     disk_id;
 167        u8      partnum;
 168};
 169
 170struct vblk_volu {                      /* VBLK Volume */
 171        u8      volume_type[16];
 172        u8      volume_state[16];
 173        u8      guid[16];
 174        u8      drive_hint[4];
 175        u64     size;
 176        u8      partition_type;
 177};
 178
 179struct vblk_head {                      /* VBLK standard header */
 180        u32 group;
 181        u16 rec;
 182        u16 nrec;
 183};
 184
 185struct vblk {                           /* Generalised VBLK */
 186        u8      name[64];
 187        u64     obj_id;
 188        u32     sequence;
 189        u8      flags;
 190        u8      type;
 191        union {
 192                struct vblk_comp comp;
 193                struct vblk_dgrp dgrp;
 194                struct vblk_disk disk;
 195                struct vblk_part part;
 196                struct vblk_volu volu;
 197        } vblk;
 198        struct list_head list;
 199};
 200
 201struct ldmdb {                          /* Cache of the database */
 202        struct privhead ph;
 203        struct tocblock toc;
 204        struct vmdb     vm;
 205        struct list_head v_dgrp;
 206        struct list_head v_disk;
 207        struct list_head v_volu;
 208        struct list_head v_comp;
 209        struct list_head v_part;
 210};
 211
 212int ldm_partition(struct parsed_partitions *state);
 213
 214#endif /* _FS_PT_LDM_H_ */
 215
 216
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