block/partitions/ldm.h

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /**
   3  * ldm - Part of the Linux-NTFS project.
   4  *
   5  * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
   6  * Copyright (c) 2001-2007 Anton Altaparmakov
   7  * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
   8  *
   9  * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads
  10  */
  11
  12 #ifndef _FS_PT_LDM_H_
  13 #define _FS_PT_LDM_H_
  14
  15 #include <linux/types.h>
  16 #include <linux/list.h>
  17 #include <linux/genhd.h>
  18 #include <linux/fs.h>
  19 #include <asm/unaligned.h>
  20 #include <asm/byteorder.h>
  21
  22 struct parsed_partitions;
  23
  24 /* Magic numbers in CPU format. */
  25 #define MAGIC_VMDB      0x564D4442              /* VMDB */
  26 #define MAGIC_VBLK      0x56424C4B              /* VBLK */
  27 #define MAGIC_PRIVHEAD  0x5052495648454144ULL   /* PRIVHEAD */
  28 #define MAGIC_TOCBLOCK  0x544F43424C4F434BULL   /* TOCBLOCK */
  29
  30 /* The defined vblk types. */
  31 #define VBLK_VOL5               0x51            /* Volume,     version 5 */
  32 #define VBLK_CMP3               0x32            /* Component,  version 3 */
  33 #define VBLK_PRT3               0x33            /* Partition,  version 3 */
  34 #define VBLK_DSK3               0x34            /* Disk,       version 3 */
  35 #define VBLK_DSK4               0x44            /* Disk,       version 4 */
  36 #define VBLK_DGR3               0x35            /* Disk Group, version 3 */
  37 #define VBLK_DGR4               0x45            /* Disk Group, version 4 */
  38
  39 /* vblk flags indicating extra information will be present */
  40 #define VBLK_FLAG_COMP_STRIPE   0x10
  41 #define VBLK_FLAG_PART_INDEX    0x08
  42 #define VBLK_FLAG_DGR3_IDS      0x08
  43 #define VBLK_FLAG_DGR4_IDS      0x08
  44 #define VBLK_FLAG_VOLU_ID1      0x08
  45 #define VBLK_FLAG_VOLU_ID2      0x20
  46 #define VBLK_FLAG_VOLU_SIZE     0x80
  47 #define VBLK_FLAG_VOLU_DRIVE    0x02
  48
  49 /* size of a vblk's static parts */
  50 #define VBLK_SIZE_HEAD          16
  51 #define VBLK_SIZE_CMP3          22              /* Name and version */
  52 #define VBLK_SIZE_DGR3          12
  53 #define VBLK_SIZE_DGR4          44
  54 #define VBLK_SIZE_DSK3          12
  55 #define VBLK_SIZE_DSK4          45
  56 #define VBLK_SIZE_PRT3          28
  57 #define VBLK_SIZE_VOL5          58
  58
  59 /* component types */
  60 #define COMP_STRIPE             0x01            /* Stripe-set */
  61 #define COMP_BASIC              0x02            /* Basic disk */
  62 #define COMP_RAID               0x03            /* Raid-set */
  63
  64 /* Other constants. */
  65 #define LDM_DB_SIZE             2048            /* Size in sectors (= 1MiB). */
  66
  67 #define OFF_PRIV1               6               /* Offset of the first privhead
  68                                                    relative to the start of the
  69                                                    device in sectors */
  70
  71 /* Offsets to structures within the LDM Database in sectors. */
  72 #define OFF_PRIV2               1856            /* Backup private headers. */
  73 #define OFF_PRIV3               2047
  74
  75 #define OFF_TOCB1               1               /* Tables of contents. */
  76 #define OFF_TOCB2               2
  77 #define OFF_TOCB3               2045
  78 #define OFF_TOCB4               2046
  79
  80 #define OFF_VMDB                17              /* List of partitions. */
  81
  82 #define LDM_PARTITION           0x42            /* Formerly SFS (Landis). */
  83
  84 #define TOC_BITMAP1             "config"        /* Names of the two defined */
  85 #define TOC_BITMAP2             "log"           /* bitmaps in the TOCBLOCK. */
  86
  87 /* Borrowed from msdos.c */
  88 #define SYS_IND(p)              (get_unaligned(&(p)->sys_ind))
  89
  90 struct frag {                           /* VBLK Fragment handling */
  91         struct list_head list;
  92         u32             group;
  93         u8              num;            /* Total number of records */
  94         u8              rec;            /* This is record number n */
  95         u8              map;            /* Which portions are in use */
  96         u8              data[];
  97 };
  98
  99 /* In memory LDM database structures. */
 100
 101 struct privhead {                       /* Offsets and sizes are in sectors. */
 102         u16     ver_major;
 103         u16     ver_minor;
 104         u64     logical_disk_start;
 105         u64     logical_disk_size;
 106         u64     config_start;
 107         u64     config_size;
 108         uuid_t  disk_id;
 109 };
 110
 111 struct tocblock {                       /* We have exactly two bitmaps. */
 112         u8      bitmap1_name[16];
 113         u64     bitmap1_start;
 114         u64     bitmap1_size;
 115         u8      bitmap2_name[16];
 116         u64     bitmap2_start;
 117         u64     bitmap2_size;
 118 };
 119
 120 struct vmdb {                           /* VMDB: The database header */
 121         u16     ver_major;
 122         u16     ver_minor;
 123         u32     vblk_size;
 124         u32     vblk_offset;
 125         u32     last_vblk_seq;
 126 };
 127
 128 struct vblk_comp {                      /* VBLK Component */
 129         u8      state[16];
 130         u64     parent_id;
 131         u8      type;
 132         u8      children;
 133         u16     chunksize;
 134 };
 135
 136 struct vblk_dgrp {                      /* VBLK Disk Group */
 137         u8      disk_id[64];
 138 };
 139
 140 struct vblk_disk {                      /* VBLK Disk */
 141         uuid_t  disk_id;
 142         u8      alt_name[128];
 143 };
 144
 145 struct vblk_part {                      /* VBLK Partition */
 146         u64     start;
 147         u64     size;                   /* start, size and vol_off in sectors */
 148         u64     volume_offset;
 149         u64     parent_id;
 150         u64     disk_id;
 151         u8      partnum;
 152 };
 153
 154 struct vblk_volu {                      /* VBLK Volume */
 155         u8      volume_type[16];
 156         u8      volume_state[16];
 157         u8      guid[16];
 158         u8      drive_hint[4];
 159         u64     size;
 160         u8      partition_type;
 161 };
 162
 163 struct vblk_head {                      /* VBLK standard header */
 164         u32 group;
 165         u16 rec;
 166         u16 nrec;
 167 };
 168
 169 struct vblk {                           /* Generalised VBLK */
 170         u8      name[64];
 171         u64     obj_id;
 172         u32     sequence;
 173         u8      flags;
 174         u8      type;
 175         union {
 176                 struct vblk_comp comp;
 177                 struct vblk_dgrp dgrp;
 178                 struct vblk_disk disk;
 179                 struct vblk_part part;
 180                 struct vblk_volu volu;
 181         } vblk;
 182         struct list_head list;
 183 };
 184
 185 struct ldmdb {                          /* Cache of the database */
 186         struct privhead ph;
 187         struct tocblock toc;
 188         struct vmdb     vm;
 189         struct list_head v_dgrp;
 190         struct list_head v_disk;
 191         struct list_head v_volu;
 192         struct list_head v_comp;
 193         struct list_head v_part;
 194 };
 195
 196 #endif /* _FS_PT_LDM_H_ */
 197