path: root/include/linux/lvm.h

/*
 * kernel/lvm.h
 *
 * Copyright (C) 1997 - 2000  Heinz Mauelshagen, Germany
 *
 * February-November 1997
 * May-July 1998
 * January-March,July,September,October,Dezember 1999
 * January 2000
 *
 * lvm is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 * 
 * lvm is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with GNU CC; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA. 
 *
 */

/*
 * Changelog
 *
 *    10/10/1997 - beginning of new structure creation
 *    12/05/1998 - incorporated structures from lvm_v1.h and deleted lvm_v1.h
 *    07/06/1998 - avoided LVM_KMALLOC_MAX define by using vmalloc/vfree
 *                 instead of kmalloc/kfree
 *    01/07/1998 - fixed wrong LVM_MAX_SIZE
 *    07/07/1998 - extended pe_t structure by ios member (for statistic)
 *    02/08/1998 - changes for official char/block major numbers
 *    07/08/1998 - avoided init_module() and cleanup_module() to be static
 *    29/08/1998 - seprated core and disk structure type definitions
 *    01/09/1998 - merged kernel integration version (mike)
 *    20/01/1999 - added LVM_PE_DISK_OFFSET macro for use in
 *                 vg_read_with_pv_and_lv(), pv_move_pe(), pv_show_pe_text()...
 *    18/02/1999 - added definition of time_disk_t structure for;
 *                 keeps time stamps on disk for nonatomic writes (future)
 *    15/03/1999 - corrected LV() and VG() macro definition to use argument
 *                 instead of minor
 *    03/07/1999 - define for genhd.c name handling
 *    23/07/1999 - implemented snapshot part
 *    08/12/1999 - changed LVM_LV_SIZE_MAX macro to reflect current 1TB limit
 *    01/01/2000 - extended lv_v2 core structure by wait_queue member
 *    12/02/2000 - integrated Andrea Arcagnelli's snapshot work
 *
 */


#ifndef _LVM_H_INCLUDE
#define _LVM_H_INCLUDE

#define	_LVM_H_VERSION	"LVM 0.8final (15/2/2000)"

/*
 * preprocessor definitions
 */
/* if you like emergency reset code in the driver */
#define	LVM_TOTAL_RESET

#define LVM_GET_INODE
#undef	LVM_HD_NAME

/* lots of debugging output (see driver source)
   #define DEBUG_LVM_GET_INFO
   #define DEBUG
   #define DEBUG_MAP
   #define DEBUG_MAP_SIZE
   #define DEBUG_IOCTL
   #define DEBUG_READ
   #define DEBUG_GENDISK
   #define DEBUG_VG_CREATE
   #define DEBUG_LVM_BLK_OPEN
   #define DEBUG_KFREE
 */

#include <linux/version.h>

#ifndef __KERNEL__
#define ____NOT_KERNEL____
#define __KERNEL__
#endif
#include <linux/kdev_t.h>
#ifdef ____NOT_KERNEL____
#undef ____NOT_KERNEL____
#undef __KERNEL__
#endif

#include <linux/major.h>

#if LINUX_VERSION_CODE >= KERNEL_VERSION ( 2, 3 ,0)
#include <linux/spinlock.h>
#else
#include <asm/spinlock.h>
#endif

#include <asm/semaphore.h>
#include <asm/page.h>

#if !defined ( LVM_BLK_MAJOR) || !defined ( LVM_CHAR_MAJOR)
#error Bad include/linux/major.h - LVM MAJOR undefined
#endif


#define LVM_STRUCT_VERSION	1	/* structure version */

#ifndef min
#define min(a,b) (((a)<(b))?(a):(b))
#endif
#ifndef max
#define max(a,b) (((a)>(b))?(a):(b))
#endif

/* set the default structure version */
#if ( LVM_STRUCT_VERSION == 1)
#define pv_t pv_v1_t
#define lv_t lv_v2_t
#define vg_t vg_v1_t
#define pv_disk_t pv_disk_v1_t
#define lv_disk_t lv_disk_v1_t
#define vg_disk_t vg_disk_v1_t
#define lv_exception_t lv_v2_exception_t
#endif


/*
 * i/o protocoll version
 *
 * defined here for the driver and defined seperate in the
 * user land LVM parts
 *
 */
#define	LVM_DRIVER_IOP_VERSION	        6

#define LVM_NAME        "lvm"

/*
 * VG/LV indexing macros
 */
/* character minor maps directly to volume group */
#define	VG_CHR(a) ( a)

/* block minor indexes into a volume group/logical volume indirection table */
#define	VG_BLK(a)	( vg_lv_map[a].vg_number)
#define LV_BLK(a)	( vg_lv_map[a].lv_number)

/*
 * absolute limits for VGs, PVs per VG and LVs per VG
 */
#define ABS_MAX_VG	99
#define ABS_MAX_PV	256
#define ABS_MAX_LV	256	/* caused by 8 bit minor */

#define MAX_VG  ABS_MAX_VG
#define MAX_LV	ABS_MAX_LV
#define	MAX_PV	ABS_MAX_PV

#if ( MAX_VG > ABS_MAX_VG)
#undef MAX_VG
#define MAX_VG ABS_MAX_VG
#endif

#if ( MAX_LV > ABS_MAX_LV)
#undef MAX_LV
#define MAX_LV ABS_MAX_LV
#endif


/*
 * VGDA: default disk spaces and offsets
 *
 *   there's space after the structures for later extensions.
 *
 *   offset            what                                size
 *   ---------------   ----------------------------------  ------------
 *   0                 physical volume structure           ~500 byte
 *
 *   1K                volume group structure              ~200 byte
 *
 *   5K                time stamp structure                ~
 *
 *   6K                namelist of physical volumes        128 byte each
 *
 *   6k + n * 128byte  n logical volume structures         ~300 byte each
 *
 *   + m * 328byte     m physical extent alloc. structs    4 byte each
 *
 *   End of disk -     first physical extent               typical 4 megabyte
 *   PE total *
 *   PE size
 *
 *
 */

/* DONT TOUCH THESE !!! */
/* base of PV structure in disk partition */
#define	LVM_PV_DISK_BASE  	0L

/* size reserved for PV structure on disk */
#define	LVM_PV_DISK_SIZE  	1024L

/* base of VG structure in disk partition */
#define	LVM_VG_DISK_BASE  	LVM_PV_DISK_SIZE

/* size reserved for VG structure */
#define	LVM_VG_DISK_SIZE  	( 9 * 512L)

/* size reserved for timekeeping */
#define	LVM_TIMESTAMP_DISK_BASE	( LVM_VG_DISK_BASE +  LVM_VG_DISK_SIZE)
#define	LVM_TIMESTAMP_DISK_SIZE	512L	/* reserved for timekeeping */

/* name list of physical volumes on disk */
#define	LVM_PV_NAMELIST_DISK_BASE ( LVM_TIMESTAMP_DISK_BASE + \
                                    LVM_TIMESTAMP_DISK_SIZE)

/* now for the dynamically calculated parts of the VGDA */
#define	LVM_LV_DISK_OFFSET(a, b) ( (a)->lv_on_disk.base + sizeof ( lv_t) * b)
#define	LVM_DISK_SIZE(pv) 	 ( (pv)->pe_on_disk.base + \
                                   (pv)->pe_on_disk.size)
#define	LVM_PE_DISK_OFFSET(pe, pv)	( pe * pv->pe_size + \
					  ( LVM_DISK_SIZE ( pv) / SECTOR_SIZE))
#define	LVM_PE_ON_DISK_BASE(pv) \
   { int rest; \
     pv->pe_on_disk.base = pv->lv_on_disk.base + pv->lv_on_disk.size; \
     if ( ( rest = pv->pe_on_disk.base % SECTOR_SIZE) != 0) \
        pv->pe_on_disk.base += ( SECTOR_SIZE - rest); \
   }
/* END default disk spaces and offsets for PVs */


/*
 * LVM_PE_T_MAX corresponds to:
 *
 * 8KB PE size can map a ~512 MB logical volume at the cost of 1MB memory,
 *
 * 128MB PE size can map a 8TB logical volume at the same cost of memory.
 *
 * Default PE size of 4 MB gives a maximum logical volume size of 256 GB.
 *
 * Maximum PE size of 16GB gives a maximum logical volume size of 1024 TB.
 *
 * AFAIK, the actual kernels limit this to 1 TB.
 *
 * Should be a sufficient spectrum ;*)
 */

/* This is the usable size of disk_pe_t.le_num !!!        v     v */
#define	LVM_PE_T_MAX		( ( 1 << ( sizeof ( uint16_t) * 8)) - 2)

#define	LVM_LV_SIZE_MAX(a)	( ( long long) LVM_PE_T_MAX * (a)->pe_size > ( long long) 2*1024*1024*1024 ? ( long long) 2*1024*1024*1024 : ( long long) LVM_PE_T_MAX * (a)->pe_size)
#define	LVM_MIN_PE_SIZE		( 8L * 2)	/* 8 KB in sectors */
#define	LVM_MAX_PE_SIZE		( 16L * 1024L * 1024L * 2)	/* 16GB in sectors */
#define	LVM_DEFAULT_PE_SIZE	( 4096L * 2)	/* 4 MB in sectors */
#define	LVM_DEFAULT_STRIPE_SIZE	16L	/* 16 KB  */
#define	LVM_MIN_STRIPE_SIZE	( PAGE_SIZE>>9)	/* PAGESIZE in sectors */
#define	LVM_MAX_STRIPE_SIZE	( 512L * 2)	/* 512 KB in sectors */
#define	LVM_MAX_STRIPES		128	/* max # of stripes */
#define	LVM_MAX_SIZE            ( 1024LU * 1024 * 1024 * 2)	/* 1TB[sectors] */
#define	LVM_MAX_MIRRORS    	2	/* future use */
#define	LVM_MIN_READ_AHEAD	0	/* minimum read ahead sectors */
#define	LVM_MAX_READ_AHEAD	256	/* maximum read ahead sectors */
#define	LVM_MAX_LV_IO_TIMEOUT	60	/* seconds I/O timeout (future use) */
#define	LVM_PARTITION           0xfe	/* LVM partition id */
#define	LVM_NEW_PARTITION       0x8e	/* new LVM partition id (10/09/1999) */
#define	LVM_PE_SIZE_PV_SIZE_REL	5	/* max relation PV size and PE size */

#define	LVM_SNAPSHOT_MAX_CHUNK	1024	/* 1024 KB */
#define	LVM_SNAPSHOT_DEF_CHUNK	64	/* 64  KB */
#define	LVM_SNAPSHOT_MIN_CHUNK	1	/* 1   KB */

#define	UNDEF	-1
#define FALSE	0
#define TRUE	1


/*
 * ioctls
 */
/* volume group */
#define	VG_CREATE               _IOW ( 0xfe, 0x00, 1)
#define	VG_REMOVE               _IOW ( 0xfe, 0x01, 1)

#define	VG_EXTEND               _IOW ( 0xfe, 0x03, 1)
#define	VG_REDUCE               _IOW ( 0xfe, 0x04, 1)

#define	VG_STATUS               _IOWR ( 0xfe, 0x05, 1)
#define	VG_STATUS_GET_COUNT     _IOWR ( 0xfe, 0x06, 1)
#define	VG_STATUS_GET_NAMELIST  _IOWR ( 0xfe, 0x07, 1)

#define	VG_SET_EXTENDABLE       _IOW ( 0xfe, 0x08, 1)


/* logical volume */
#define	LV_CREATE               _IOW ( 0xfe, 0x20, 1)
#define	LV_REMOVE               _IOW ( 0xfe, 0x21, 1)

#define	LV_ACTIVATE             _IO ( 0xfe, 0x22)
#define	LV_DEACTIVATE           _IO ( 0xfe, 0x23)

#define	LV_EXTEND               _IOW ( 0xfe, 0x24, 1)
#define	LV_REDUCE               _IOW ( 0xfe, 0x25, 1)

#define	LV_STATUS_BYNAME        _IOWR ( 0xfe, 0x26, 1)
#define	LV_STATUS_BYINDEX       _IOWR ( 0xfe, 0x27, 1)

#define LV_SET_ACCESS           _IOW ( 0xfe, 0x28, 1)
#define LV_SET_ALLOCATION       _IOW ( 0xfe, 0x29, 1)
#define LV_SET_STATUS           _IOW ( 0xfe, 0x2a, 1)

#define LE_REMAP                _IOW ( 0xfe, 0x2b, 1)


/* physical volume */
#define	PV_STATUS               _IOWR ( 0xfe, 0x40, 1)
#define	PV_CHANGE               _IOWR ( 0xfe, 0x41, 1)
#define	PV_FLUSH                _IOW ( 0xfe, 0x42, 1)

/* physical extent */
#define	PE_LOCK_UNLOCK          _IOW ( 0xfe, 0x50, 1)

/* i/o protocol version */
#define	LVM_GET_IOP_VERSION     _IOR ( 0xfe, 0x98, 1)

#ifdef LVM_TOTAL_RESET
/* special reset function for testing purposes */
#define	LVM_RESET               _IO ( 0xfe, 0x99)
#endif

/* lock the logical volume manager */
#define	LVM_LOCK_LVM            _IO ( 0xfe, 0x100)
/* END ioctls */


/*
 * Status flags
 */
/* volume group */
#define	VG_ACTIVE            0x01	/* vg_status */
#define	VG_EXPORTED          0x02	/*     "     */
#define	VG_EXTENDABLE        0x04	/*     "     */

#define	VG_READ              0x01	/* vg_access */
#define	VG_WRITE             0x02	/*     "     */

/* logical volume */
#define	LV_ACTIVE            0x01	/* lv_status */
#define	LV_SPINDOWN          0x02	/*     "     */

#define	LV_READ              0x01	/* lv_access */
#define	LV_WRITE             0x02	/*     "     */
#define	LV_SNAPSHOT          0x04	/*     "     */
#define	LV_SNAPSHOT_ORG      0x08	/*     "     */

#define	LV_BADBLOCK_ON       0x01	/* lv_badblock */

#define	LV_STRICT            0x01	/* lv_allocation */
#define	LV_CONTIGUOUS        0x02	/*       "       */

/* physical volume */
#define	PV_ACTIVE            0x01	/* pv_status */
#define	PV_ALLOCATABLE       0x02	/* pv_allocatable */


/*
 * Structure definitions core/disk follow
 *
 * conditional conversion takes place on big endian architectures
 * in functions * pv_copy_*(), vg_copy_*() and lv_copy_*()
 *
 */

#define	NAME_LEN		128	/* don't change!!! */
#define	UUID_LEN		16	/* don't change!!! */

/* remap physical sector/rdev pairs */
typedef struct
{
    struct list_head hash;
    ulong rsector_org;
    kdev_t rdev_org;
    ulong rsector_new;
    kdev_t rdev_new;
} lv_block_exception_t;


/* disk stored pe information */
typedef struct
  {
    uint16_t lv_num;
    uint16_t le_num;
  }
disk_pe_t;

/* disk stored PV, VG, LV and PE size and offset information */
typedef struct
  {
    uint32_t base;
    uint32_t size;
  }
lvm_disk_data_t;


/*
 * Structure Physical Volume (PV) Version 1
 */

/* core */
typedef struct
  {
    uint8_t id[2];		/* Identifier */
    uint16_t version;		/* HM lvm version */
    lvm_disk_data_t pv_on_disk;
    lvm_disk_data_t vg_on_disk;
    lvm_disk_data_t pv_namelist_on_disk;
    lvm_disk_data_t lv_on_disk;
    lvm_disk_data_t pe_on_disk;
    uint8_t pv_name[NAME_LEN];
    uint8_t vg_name[NAME_LEN];
    uint8_t system_id[NAME_LEN];	/* for vgexport/vgimport */
    kdev_t pv_dev;
    uint32_t pv_number;
    uint32_t pv_status;
    uint32_t pv_allocatable;
    uint32_t pv_size;		/* HM */
    uint32_t lv_cur;
    uint32_t pe_size;
    uint32_t pe_total;
    uint32_t pe_allocated;
    uint32_t pe_stale;		/* for future use */

    disk_pe_t *pe;		/* HM */
    struct inode *inode;	/* HM */
  }
pv_v1_t;

/* disk */
typedef struct
  {
    uint8_t id[2];		/* Identifier */
    uint16_t version;		/* HM lvm version */
    lvm_disk_data_t pv_on_disk;
    lvm_disk_data_t vg_on_disk;
    lvm_disk_data_t pv_namelist_on_disk;
    lvm_disk_data_t lv_on_disk;
    lvm_disk_data_t pe_on_disk;
    uint8_t pv_name[NAME_LEN];
    uint8_t vg_name[NAME_LEN];
    uint8_t system_id[NAME_LEN];	/* for vgexport/vgimport */
    uint32_t pv_major;
    uint32_t pv_number;
    uint32_t pv_status;
    uint32_t pv_allocatable;
    uint32_t pv_size;		/* HM */
    uint32_t lv_cur;
    uint32_t pe_size;
    uint32_t pe_total;
    uint32_t pe_allocated;
  }
pv_disk_v1_t;


/*
 * Structure Physical Volume (PV) Version 2 (future!)
 */

typedef struct
  {
    uint8_t id[2];		/* Identifier */
    uint16_t version;		/* HM lvm version */
    lvm_disk_data_t pv_on_disk;
    lvm_disk_data_t vg_on_disk;
    lvm_disk_data_t pv_uuid_on_disk;
    lvm_disk_data_t lv_on_disk;
    lvm_disk_data_t pe_on_disk;
    uint8_t pv_name[NAME_LEN];
    uint8_t vg_name[NAME_LEN];
    uint8_t system_id[NAME_LEN];	/* for vgexport/vgimport */
    kdev_t pv_dev;
    uint32_t pv_number;
    uint32_t pv_status;
    uint32_t pv_allocatable;
    uint32_t pv_size;		/* HM */
    uint32_t lv_cur;
    uint32_t pe_size;
    uint32_t pe_total;
    uint32_t pe_allocated;
    uint32_t pe_stale;		/* for future use */
    disk_pe_t *pe;		/* HM */
    struct inode *inode;	/* HM */
    /* delta to version 1 starts here */
    uint8_t pv_uuid[UUID_LEN];
    uint32_t pv_atime;		/* PV access time */
    uint32_t pv_ctime;		/* PV creation time */
    uint32_t pv_mtime;		/* PV modification time */
  }
pv_v2_t;


/*
 * Structures for Logical Volume (LV)
 */

/* core PE information */
typedef struct
  {
    kdev_t dev;
    uint32_t pe;		/* to be changed if > 2TB */
    uint32_t reads;
    uint32_t writes;
  }
pe_t;

typedef struct
  {
    uint8_t lv_name[NAME_LEN];
    kdev_t old_dev;
    kdev_t new_dev;
    ulong old_pe;
    ulong new_pe;
  }
le_remap_req_t;



/*
 * Structure Logical Volume (LV) Version 1
 */

/* disk */
typedef struct
  {
    uint8_t lv_name[NAME_LEN];
    uint8_t vg_name[NAME_LEN];
    uint32_t lv_access;
    uint32_t lv_status;
    uint32_t lv_open;		/* HM */
    uint32_t lv_dev;		/* HM */
    uint32_t lv_number;		/* HM */
    uint32_t lv_mirror_copies;	/* for future use */
    uint32_t lv_recovery;	/*       "        */
    uint32_t lv_schedule;	/*       "        */
    uint32_t lv_size;
    uint32_t dummy;
    uint32_t lv_current_le;	/* for future use */
    uint32_t lv_allocated_le;
    uint32_t lv_stripes;
    uint32_t lv_stripesize;
    uint32_t lv_badblock;	/* for future use */
    uint32_t lv_allocation;
    uint32_t lv_io_timeout;	/* for future use */
    uint32_t lv_read_ahead;	/* HM, for future use */
  }
lv_disk_v1_t;


/*
 * Structure Logical Volume (LV) Version 2
 */

/* core */
typedef struct lv_v2
  {
    uint8_t lv_name[NAME_LEN];
    uint8_t vg_name[NAME_LEN];
    uint32_t lv_access;
    uint32_t lv_status;
    uint32_t lv_open;		/* HM */
    kdev_t lv_dev;		/* HM */
    uint32_t lv_number;		/* HM */
    uint32_t lv_mirror_copies;	/* for future use */
    uint32_t lv_recovery;	/*       "        */
    uint32_t lv_schedule;	/*       "        */
    uint32_t lv_size;
    pe_t *lv_current_pe;	/* HM */
    uint32_t lv_current_le;	/* for future use */
    uint32_t lv_allocated_le;
    uint32_t lv_stripes;
    uint32_t lv_stripesize;
    uint32_t lv_badblock;	/* for future use */
    uint32_t lv_allocation;
    uint32_t lv_io_timeout;	/* for future use */
    uint32_t lv_read_ahead;

    /* delta to version 1 starts here */
    struct lv_v2 *lv_snapshot_org;
    struct lv_v2 *lv_snapshot_prev;
    struct lv_v2 *lv_snapshot_next;
    lv_block_exception_t *lv_block_exception;
    uint8_t __unused;
    uint32_t lv_remap_ptr;
    uint32_t lv_remap_end;
    uint32_t lv_chunk_size;
    uint32_t lv_snapshot_minor;
    struct kiobuf * lv_iobuf;
    struct semaphore lv_snapshot_sem;
    struct list_head * lv_snapshot_hash_table;
    unsigned long lv_snapshot_hash_mask;
} lv_v2_t;

/* disk */
typedef struct
  {
    uint8_t lv_name[NAME_LEN];
    uint8_t vg_name[NAME_LEN];
    uint32_t lv_access;
    uint32_t lv_status;
    uint32_t lv_open;		/* HM */
    uint32_t lv_dev;		/* HM */
    uint32_t lv_number;		/* HM */
    uint32_t lv_mirror_copies;	/* for future use */
    uint32_t lv_recovery;	/*       "        */
    uint32_t lv_schedule;	/*       "        */
    uint32_t lv_size;
    uint32_t dummy;
    uint32_t lv_current_le;	/* for future use */
    uint32_t lv_allocated_le;
    uint32_t lv_stripes;
    uint32_t lv_stripesize;
    uint32_t lv_badblock;	/* for future use */
    uint32_t lv_allocation;
    uint32_t lv_io_timeout;	/* for future use */
    uint32_t lv_read_ahead;	/* HM, for future use */
  }
lv_disk_v2_t;


/*
 * Structure Volume Group (VG) Version 1
 */

typedef struct
  {
    uint8_t vg_name[NAME_LEN];	/* volume group name */
    uint32_t vg_number;		/* volume group number */
    uint32_t vg_access;		/* read/write */
    uint32_t vg_status;		/* active or not */
    uint32_t lv_max;		/* maximum logical volumes */
    uint32_t lv_cur;		/* current logical volumes */
    uint32_t lv_open;		/* open    logical volumes */
    uint32_t pv_max;		/* maximum physical volumes */
    uint32_t pv_cur;		/* current physical volumes FU */
    uint32_t pv_act;		/* active physical volumes */
    uint32_t dummy;		/* was obsolete max_pe_per_pv */
    uint32_t vgda;		/* volume group descriptor arrays FU */
    uint32_t pe_size;		/* physical extent size in sectors */
    uint32_t pe_total;		/* total of physical extents */
    uint32_t pe_allocated;	/* allocated physical extents */
    uint32_t pvg_total;		/* physical volume groups FU */
    struct proc_dir_entry *proc;
    pv_t *pv[ABS_MAX_PV + 1];	/* physical volume struct pointers */
    lv_t *lv[ABS_MAX_LV + 1];	/* logical  volume struct pointers */
  }
vg_v1_t;

typedef struct
  {
    uint8_t vg_name[NAME_LEN];	/* volume group name */
    uint32_t vg_number;		/* volume group number */
    uint32_t vg_access;		/* read/write */
    uint32_t vg_status;		/* active or not */
    uint32_t lv_max;		/* maximum logical volumes */
    uint32_t lv_cur;		/* current logical volumes */
    uint32_t lv_open;		/* open    logical volumes */
    uint32_t pv_max;		/* maximum physical volumes */
    uint32_t pv_cur;		/* current physical volumes FU */
    uint32_t pv_act;		/* active physical volumes */
    uint32_t dummy;
    uint32_t vgda;		/* volume group descriptor arrays FU */
    uint32_t pe_size;		/* physical extent size in sectors */
    uint32_t pe_total;		/* total of physical extents */
    uint32_t pe_allocated;	/* allocated physical extents */
    uint32_t pvg_total;		/* physical volume groups FU */
  }
vg_disk_v1_t;

/*
 * Structure Volume Group (VG) Version 2
 */

typedef struct
  {
    uint8_t vg_name[NAME_LEN];	/* volume group name */
    uint32_t vg_number;		/* volume group number */
    uint32_t vg_access;		/* read/write */
    uint32_t vg_status;		/* active or not */
    uint32_t lv_max;		/* maximum logical volumes */
    uint32_t lv_cur;		/* current logical volumes */
    uint32_t lv_open;		/* open    logical volumes */
    uint32_t pv_max;		/* maximum physical volumes */
    uint32_t pv_cur;		/* current physical volumes FU */
    uint32_t pv_act;		/* future: active physical volumes */
    uint32_t max_pe_per_pv;	/* OBSOLETE maximum PE/PV */
    uint32_t vgda;		/* volume group descriptor arrays FU */
    uint32_t pe_size;		/* physical extent size in sectors */
    uint32_t pe_total;		/* total of physical extents */
    uint32_t pe_allocated;	/* allocated physical extents */
    uint32_t pvg_total;		/* physical volume groups FU */
    struct proc_dir_entry *proc;
    pv_t *pv[ABS_MAX_PV + 1];	/* physical volume struct pointers */
    lv_t *lv[ABS_MAX_LV + 1];	/* logical  volume struct pointers */
    /* delta to version 1 starts here */
    uint8_t vg_uuid[UUID_LEN];	/*  volume group UUID */
    time_t vg_atime;		/* VG access time */
    time_t vg_ctime;		/* VG creation time */
    time_t vg_mtime;		/* VG modification time */
  }
vg_v2_t;


/*
 * Timekeeping structure on disk (0.7 feature)
 *
 * Holds several timestamps for start/stop time of non
 * atomic VGDA disk i/o operations
 *
 */

typedef struct
  {
    uint32_t seconds;		/* seconds since the epoch */
    uint32_t jiffies;		/* micro timer */
  }
lvm_time_t;

#define	TIMESTAMP_ID_SIZE	2
typedef struct
  {
    uint8_t id[TIMESTAMP_ID_SIZE];	/* Identifier */
    lvm_time_t pv_vg_lv_pe_io_begin;
    lvm_time_t pv_vg_lv_pe_io_end;
    lvm_time_t pv_io_begin;
    lvm_time_t pv_io_end;
    lvm_time_t vg_io_begin;
    lvm_time_t vg_io_end;
    lvm_time_t lv_io_begin;
    lvm_time_t lv_io_end;
    lvm_time_t pe_io_begin;
    lvm_time_t pe_io_end;
    lvm_time_t pe_move_io_begin;
    lvm_time_t pe_move_io_end;
    uint8_t dummy[LVM_TIMESTAMP_DISK_SIZE -
		  TIMESTAMP_ID_SIZE -
		  12 * sizeof (lvm_time_t)];
    /* ATTENTION  ^^ */
  }
timestamp_disk_t;

/* same on disk and in core so far */
typedef timestamp_disk_t timestamp_t;

/* function identifiers for timestamp actions */
typedef enum
  {
    PV_VG_LV_PE_IO_BEGIN,
    PV_VG_LV_PE_IO_END,
    PV_IO_BEGIN,
    PV_IO_END,
    VG_IO_BEGIN,
    VG_IO_END,
    LV_IO_BEGIN,
    LV_IO_END,
    PE_IO_BEGIN,
    PE_IO_END,
    PE_MOVE_IO_BEGIN,
    PE_MOVE_IO_END
  }
ts_fct_id_t;


/*
 * Request structures for ioctls
 */

/* Request structure PV_STATUS */
typedef struct
  {
    char pv_name[NAME_LEN];
    pv_t *pv;
  }
pv_status_req_t, pv_change_req_t;

/* Request structure PV_FLUSH */
typedef struct
  {
    char pv_name[NAME_LEN];
  }
pv_flush_req_t;


/* Request structure PE_MOVE */
typedef struct
  {
    enum
      {
	LOCK_PE, UNLOCK_PE
      }
    lock;
    struct
      {
	kdev_t lv_dev;
	kdev_t pv_dev;
	uint32_t pv_offset;
      }
    data;
  }
pe_lock_req_t;


/* Request structure LV_STATUS_BYNAME */
typedef struct
  {
    char lv_name[NAME_LEN];
    lv_t *lv;
  }
lv_status_byname_req_t, lv_req_t;

/* Request structure LV_STATUS_BYINDEX */
typedef struct
  {
    ulong lv_index;
    lv_t *lv;
  }
lv_status_byindex_req_t;

#endif /* #ifndef _LVM_H_INCLUDE */