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TOMOYO Linux Cross Reference
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 
 36 struct 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 
104 struct 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 
117 struct 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 
127 struct 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 
136 struct 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 
144 struct vblk_comp {                      /* VBLK Component */
145         u8      state[16];
146         u64     parent_id;
147         u8      type;
148         u8      children;
149         u16     chunksize;
150 };
151 
152 struct vblk_dgrp {                      /* VBLK Disk Group */
153         u8      disk_id[64];
154 };
155 
156 struct vblk_disk {                      /* VBLK Disk */
157         u8      disk_id[GUID_SIZE];
158         u8      alt_name[128];
159 };
160 
161 struct 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 
170 struct 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 
179 struct vblk_head {                      /* VBLK standard header */
180         u32 group;
181         u16 rec;
182         u16 nrec;
183 };
184 
185 struct 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 
201 struct 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 
212 int ldm_partition(struct parsed_partitions *state);
213 
214 #endif /* _FS_PT_LDM_H_ */
215 
216 

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