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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[0];
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 int ldm_partition(struct parsed_partitions *state);
197 
198 #endif /* _FS_PT_LDM_H_ */
199 
200