ldm.h

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#ifndef _FS_PT_LDM_H_
#define _FS_PT_LDM_H_

#include <linux/types.h>
#include <linux/list.h>
#include <linux/genhd.h>
#include <linux/fs.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>

struct parsed_partitions;

/* Magic numbers in CPU format. */
#define MAGIC_VMDB  0x564D4442      /* VMDB */
#define MAGIC_VBLK  0x56424C4B      /* VBLK */
#define MAGIC_PRIVHEAD  0x5052495648454144ULL   /* PRIVHEAD */
#define MAGIC_TOCBLOCK  0x544F43424C4F434BULL   /* TOCBLOCK */

/* The defined vblk types. */
#define VBLK_VOL5       0x51        /* Volume,     version 5 */
#define VBLK_CMP3       0x32        /* Component,  version 3 */
#define VBLK_PRT3       0x33        /* Partition,  version 3 */
#define VBLK_DSK3       0x34        /* Disk,       version 3 */
#define VBLK_DSK4       0x44        /* Disk,       version 4 */
#define VBLK_DGR3       0x35        /* Disk Group, version 3 */
#define VBLK_DGR4       0x45        /* Disk Group, version 4 */

/* vblk flags indicating extra information will be present */
#define VBLK_FLAG_COMP_STRIPE   0x10
#define VBLK_FLAG_PART_INDEX    0x08
#define VBLK_FLAG_DGR3_IDS  0x08
#define VBLK_FLAG_DGR4_IDS  0x08
#define VBLK_FLAG_VOLU_ID1  0x08
#define VBLK_FLAG_VOLU_ID2  0x20
#define VBLK_FLAG_VOLU_SIZE 0x80
#define VBLK_FLAG_VOLU_DRIVE    0x02

/* size of a vblk's static parts */
#define VBLK_SIZE_HEAD      16
#define VBLK_SIZE_CMP3      22      /* Name and version */
#define VBLK_SIZE_DGR3      12
#define VBLK_SIZE_DGR4      44
#define VBLK_SIZE_DSK3      12
#define VBLK_SIZE_DSK4      45
#define VBLK_SIZE_PRT3      28
#define VBLK_SIZE_VOL5      58

/* component types */
#define COMP_STRIPE     0x01        /* Stripe-set */
#define COMP_BASIC      0x02        /* Basic disk */
#define COMP_RAID       0x03        /* Raid-set */

/* Other constants. */
#define LDM_DB_SIZE     2048        /* Size in sectors (= 1MiB). */

#define OFF_PRIV1       6       /* Offset of the first privhead
                           relative to the start of the
                           device in sectors */

/* Offsets to structures within the LDM Database in sectors. */
#define OFF_PRIV2       1856        /* Backup private headers. */
#define OFF_PRIV3       2047

#define OFF_TOCB1       1       /* Tables of contents. */
#define OFF_TOCB2       2
#define OFF_TOCB3       2045
#define OFF_TOCB4       2046

#define OFF_VMDB        17      /* List of partitions. */

#define LDM_PARTITION       0x42        /* Formerly SFS (Landis). */

#define TOC_BITMAP1     "config"    /* Names of the two defined */
#define TOC_BITMAP2     "log"       /* bitmaps in the TOCBLOCK. */

/* Borrowed from msdos.c */
#define SYS_IND(p)      (get_unaligned(&(p)->sys_ind))

struct frag {               /* VBLK Fragment handling */
    struct list_head list;
    u32     group;
    u8      num;        /* Total number of records */
    u8      rec;        /* This is record number n */
    u8      map;        /* Which portions are in use */
    u8      data[0];
};

/* In memory LDM database structures. */

#define GUID_SIZE       16

struct privhead {           /* Offsets and sizes are in sectors. */
    u16 ver_major;
    u16 ver_minor;
    u64 logical_disk_start;
    u64 logical_disk_size;
    u64 config_start;
    u64 config_size;
    u8  disk_id[GUID_SIZE];
};

struct tocblock {           /* We have exactly two bitmaps. */
    u8  bitmap1_name[16];
    u64 bitmap1_start;
    u64 bitmap1_size;
    u8  bitmap2_name[16];
    u64 bitmap2_start;
    u64 bitmap2_size;
};

struct vmdb {               /* VMDB: The database header */
    u16 ver_major;
    u16 ver_minor;
    u32 vblk_size;
    u32 vblk_offset;
    u32 last_vblk_seq;
};

struct vblk_comp {          /* VBLK Component */
    u8  state[16];
    u64 parent_id;
    u8  type;
    u8  children;
    u16 chunksize;
};

struct vblk_dgrp {          /* VBLK Disk Group */
    u8  disk_id[64];
};

struct vblk_disk {          /* VBLK Disk */
    u8  disk_id[GUID_SIZE];
    u8  alt_name[128];
};

struct vblk_part {          /* VBLK Partition */
    u64 start;
    u64 size;           /* start, size and vol_off in sectors */
    u64 volume_offset;
    u64 parent_id;
    u64 disk_id;
    u8  partnum;
};

struct vblk_volu {          /* VBLK Volume */
    u8  volume_type[16];
    u8  volume_state[16];
    u8  guid[16];
    u8  drive_hint[4];
    u64 size;
    u8  partition_type;
};

struct vblk_head {          /* VBLK standard header */
    u32 group;
    u16 rec;
    u16 nrec;
};

struct vblk {               /* Generalised VBLK */
    u8  name[64];
    u64 obj_id;
    u32 sequence;
    u8  flags;
    u8  type;
    union {
        struct vblk_comp comp;
        struct vblk_dgrp dgrp;
        struct vblk_disk disk;
        struct vblk_part part;
        struct vblk_volu volu;
    } vblk;
    struct list_head list;
};

struct ldmdb {              /* Cache of the database */
    struct privhead ph;
    struct tocblock toc;
    struct vmdb     vm;
    struct list_head v_dgrp;
    struct list_head v_disk;
    struct list_head v_volu;
    struct list_head v_comp;
    struct list_head v_part;
};

int ldm_partition(struct parsed_partitions *state);

#endif /* _FS_PT_LDM_H_ */