/*
 * include/linux/lvm.h
 * kernel/lvm.h
 * tools/lib/lvm.h
 *
 * Copyright (C) 1997 - 2002  Heinz Mauelshagen, Sistina Software
 *
 * February-November 1997
 * May-July 1998
 * January-March,July,September,October,Dezember 1999
 * January,February,July,November 2000
 * January-March,June,July 2001
 * May 2002
 *
 * 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
 *    18/02/2000 - seperated user and kernel space parts by
 *                 #ifdef them with __KERNEL__
 *    08/03/2000 - implemented cluster/shared bits for vg_access
 *    26/06/2000 - implemented snapshot persistency and resizing support
 *    02/11/2000 - added hash table size member to lv structure
 *    12/11/2000 - removed unneeded timestamp definitions
 *    24/12/2000 - removed LVM_TO_{CORE,DISK}*, use cpu_{from, to}_le*
 *                 instead - Christoph Hellwig
 *    22/01/2001 - Change ulong to uint32_t
 *    14/02/2001 - changed LVM_SNAPSHOT_MIN_CHUNK to 1 page
 *    20/02/2001 - incremented IOP version to 11 because of incompatible
 *                 change in VG activation (in order to support devfs better)
 *    01/03/2001 - Revert to IOP10 and add VG_CREATE_OLD call for compatibility
 *    08/03/2001 - new lv_t (in core) version number 5: changed page member
 *                 to (struct kiobuf *) to use for COW exception table io
 *    26/03/2001 - changed lv_v4 to lv_v5 in structure definition (HM)
 *    21/06/2001 - changed BLOCK_SIZE back to 1024 for non S/390
 *    22/06/2001 - added Andreas Dilger's PE on 4k boundary alignment enhancements
 *    19/07/2001 - added rwsem compatibility macros for 2.2 kernels
 *    13/11/2001 - reduced userspace inclusion of kernel headers to a minimum
 *
 */


#ifndef _LVM_H_INCLUDE
#define _LVM_H_INCLUDE

#define LVM_RELEASE_NAME "1.0.8"
#define LVM_RELEASE_DATE "17/11/2003"

#define _LVM_KERNEL_H_VERSION   "LVM "LVM_RELEASE_NAME" ("LVM_RELEASE_DATE")"

#include <linux/version.h>

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

#ifdef __KERNEL__
#undef LVM_HD_NAME              /* display nice names in /proc/partitions */

/* 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_DEVICE
   #define DEBUG_KFREE
 */

#include <linux/kdev_t.h>
#include <linux/list.h>
#include <asm/types.h>
#include <linux/major.h>
#else
/* This prevents the need to include <linux/list.h> which
   causes problems on some platforms. It's not nice but then
   neither is the alternative. */
struct list_head {
        struct list_head *next, *prev;
};
#define __KERNEL__
#include <linux/kdev_t.h>
#undef __KERNEL__
#endif                          /* #ifndef __KERNEL__ */


#ifdef __KERNEL__
#include <linux/spinlock.h>

#include <asm/semaphore.h>
#endif                          /* #ifdef __KERNEL__ */


#include <asm/page.h>

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

#ifdef  BLOCK_SIZE
#undef  BLOCK_SIZE
#endif

#ifdef CONFIG_ARCH_S390
#define BLOCK_SIZE      4096
#else
#define BLOCK_SIZE      1024
#endif

#ifndef SECTOR_SIZE
#define SECTOR_SIZE     512
#endif

/* structure version */
#define LVM_STRUCT_VERSION 1

#define LVM_DIR_PREFIX  "/dev/"

/*
 * i/o protocol version
 *
 * defined here for the driver and defined seperate in the
 * user land tools/lib/liblvm.h
 *
 */
#define LVM_DRIVER_IOP_VERSION          10

#define LVM_NAME        "lvm"
#define LVM_GLOBAL      "global"
#define LVM_DIR         "lvm"
#define LVM_VG_SUBDIR   "VGs"
#define LVM_LV_SUBDIR   "LVs"
#define LVM_PV_SUBDIR   "PVs"

/*
 * 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
 *
 *   6K                namelist of physical volumes        128 byte each
 *
 *   6k + n * ~300byte n logical volume structures         ~300 byte each
 *
 *   + m * 4byte       m physical extent alloc. structs    4 byte each
 *
 *   End of disk -     first physical extent               typically 4 megabyte
 *   PE total *
 *   PE size
 *
 *
 */

/* DONT TOUCH THESE !!! */







/*
 * 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 pe_disk_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) 1024*1024/SECTOR_SIZE*1024*1024 ? ( long long) 1024*1024/SECTOR_SIZE*1024*1024 : ( long long) LVM_PE_T_MAX * (a)->pe_size)
#define LVM_MIN_PE_SIZE         ( 8192L / SECTOR_SIZE)  /* 8 KB in sectors */
#define LVM_MAX_PE_SIZE         ( 16L * 1024L * 1024L / SECTOR_SIZE * 1024)     /* 16GB in sectors */
#define LVM_DEFAULT_PE_SIZE     ( 32768L * 1024 / SECTOR_SIZE)  /* 32 MB in sectors */
#define LVM_DEFAULT_STRIPE_SIZE 16L     /* 16 KB  */
#define LVM_MIN_STRIPE_SIZE     ( PAGE_SIZE/SECTOR_SIZE)        /* PAGESIZE in sectors */
#define LVM_MAX_STRIPE_SIZE     ( 512L * 1024 / SECTOR_SIZE)    /* 512 KB in sectors */
#define LVM_MAX_STRIPES         128     /* max # of stripes */
#define LVM_MAX_SIZE            ( 1024LU * 1024 / SECTOR_SIZE * 1024 * 1024)    /* 1TB[sectors] */
#define LVM_MAX_MIRRORS         2       /* future use */
#define LVM_MIN_READ_AHEAD      0       /* minimum read ahead sectors */
#define LVM_DEFAULT_READ_AHEAD  1024    /* sectors for 512k scsi segments */
#define LVM_MAX_READ_AHEAD      1024    /* 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  (PAGE_SIZE/1024)        /* 4 or 8 KB */

#define UNDEF   -1

/*
 * ioctls
 * FIXME: the last parameter to _IO{W,R,WR} is a data type.  The macro will
 *        expand this using sizeof(), so putting "1" there is misleading
 *        because sizeof(1) = sizeof(int) = sizeof(2) = 4 on a 32-bit machine!
 */
/* volume group */
#define VG_CREATE_OLD           _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)
#define VG_RENAME               _IOW ( 0xfe, 0x09, 1)

/* Since 0.9beta6 */
#define VG_CREATE               _IOW ( 0xfe, 0x0a, 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)

#define LV_SNAPSHOT_USE_RATE    _IOWR ( 0xfe, 0x2c, 1)

#define LV_STATUS_BYDEV         _IOWR ( 0xfe, 0x2e, 1)

#define LV_RENAME               _IOW ( 0xfe, 0x2f, 1)

#define LV_BMAP                 _IOWR ( 0xfe, 0x30, 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 */
#if LVM_DRIVER_IOP_VERSION > 11
#define LVM_LOCK_LVM            _IO ( 0xfe, 0x9A)
#else
/* This is actually the same as _IO ( 0xff, 0x00), oops.  Remove for IOP 12+ */
#define LVM_LOCK_LVM            _IO ( 0xfe, 0x100)
#endif
/* 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       /*     "     */
#define VG_CLUSTERED         0x04       /*     "     */
#define VG_SHARED            0x08       /*     "     */

/* 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 */


/* misc */
#define LVM_SNAPSHOT_DROPPED_SECTOR 1

/*
 * 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                32      /* don't change!!! */

/* copy on write tables in disk format */
typedef struct lv_COW_table_disk_v1 {
        uint64_t pv_org_number;
        uint64_t pv_org_rsector;
        uint64_t pv_snap_number;
        uint64_t pv_snap_rsector;
} lv_COW_table_disk_t;

/* remap physical sector/rdev pairs including hash */
typedef struct lv_block_exception_v1 {
        struct list_head hash;
        uint32_t rsector_org;
        kdev_t rdev_org;
        uint32_t rsector_new;
        kdev_t rdev_new;
} lv_block_exception_t;

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

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


/*
 * physical volume structures
 */

/* core */
typedef struct pv_v2 {
        char id[2];             /* Identifier */
        unsigned short version; /* HM lvm version */
        lvm_disk_data_t pv_on_disk;
        lvm_disk_data_t vg_on_disk;
        lvm_disk_data_t pv_uuidlist_on_disk;
        lvm_disk_data_t lv_on_disk;
        lvm_disk_data_t pe_on_disk;
        char pv_name[NAME_LEN];
        char vg_name[NAME_LEN];
        char system_id[NAME_LEN];       /* for vgexport/vgimport */
        kdev_t pv_dev;
        uint pv_number;
        uint pv_status;
        uint pv_allocatable;
        uint pv_size;           /* HM */
        uint lv_cur;
        uint pe_size;
        uint pe_total;
        uint pe_allocated;
        uint pe_stale;          /* for future use */
        pe_disk_t *pe;          /* HM */
        struct block_device *bd;
        char pv_uuid[UUID_LEN + 1];

#ifndef __KERNEL__
        uint32_t pe_start;      /* in sectors */
#endif
} pv_t;


/* disk */
typedef struct pv_disk_v2 {
        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_uuidlist_on_disk;
        lvm_disk_data_t lv_on_disk;
        lvm_disk_data_t pe_on_disk;
        uint8_t pv_uuid[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;

        /* new in struct version 2 */
        uint32_t pe_start;      /* in sectors */

} pv_disk_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 {
        char lv_name[NAME_LEN];
        kdev_t old_dev;
        kdev_t new_dev;
        uint32_t old_pe;
        uint32_t new_pe;
} le_remap_req_t;

typedef struct lv_bmap {
        uint32_t lv_block;
        dev_t lv_dev;
} lv_bmap_t;

/*
 * Structure Logical Volume (LV) Version 3
 */

/* core */
typedef struct lv_v5 {
        char lv_name[NAME_LEN];
        char vg_name[NAME_LEN];
        uint lv_access;
        uint lv_status;
        uint lv_open;           /* HM */
        kdev_t lv_dev;          /* HM */
        uint lv_number;         /* HM */
        uint lv_mirror_copies;  /* for future use */
        uint lv_recovery;       /*       "        */
        uint lv_schedule;       /*       "        */
        uint lv_size;
        pe_t *lv_current_pe;    /* HM */
        uint lv_current_le;     /* for future use */
        uint lv_allocated_le;
        uint lv_stripes;
        uint lv_stripesize;
        uint lv_badblock;       /* for future use */
        uint lv_allocation;
        uint lv_io_timeout;     /* for future use */
        uint lv_read_ahead;

        /* delta to version 1 starts here */
        struct lv_v5 *lv_snapshot_org;
        struct lv_v5 *lv_snapshot_prev;
        struct lv_v5 *lv_snapshot_next;
        lv_block_exception_t *lv_block_exception;
        uint lv_remap_ptr;
        uint lv_remap_end;
        uint lv_chunk_size;
        uint lv_snapshot_minor;
#ifdef __KERNEL__
        struct kiobuf *lv_iobuf;
        struct kiobuf *lv_COW_table_iobuf;
        struct rw_semaphore lv_lock;
        struct list_head *lv_snapshot_hash_table;
        uint32_t lv_snapshot_hash_table_size;
        uint32_t lv_snapshot_hash_mask;
        wait_queue_head_t lv_snapshot_wait;
        int lv_snapshot_use_rate;
        struct vg_v3 *vg;

        uint lv_allocated_snapshot_le;
#else
        char dummy[200];
#endif
} lv_t;

/* disk */
typedef struct lv_disk_v3 {
        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 lv_snapshot_minor;     /* minor number of original */
        uint16_t lv_chunk_size; /* chunk size of snapshot */
        uint16_t dummy;
        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 */
} lv_disk_t;

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

/* core */
typedef struct vg_v3 {
        char vg_name[NAME_LEN]; /* volume group name */
        uint vg_number;         /* volume group number */
        uint vg_access;         /* read/write */
        uint vg_status;         /* active or not */
        uint lv_max;            /* maximum logical volumes */
        uint lv_cur;            /* current logical volumes */
        uint lv_open;           /* open    logical volumes */
        uint pv_max;            /* maximum physical volumes */
        uint pv_cur;            /* current physical volumes FU */
        uint pv_act;            /* active physical volumes */
        uint dummy;             /* was obsolete max_pe_per_pv */
        uint vgda;              /* volume group descriptor arrays FU */
        uint pe_size;           /* physical extent size in sectors */
        uint pe_total;          /* total of physical extents */
        uint pe_allocated;      /* allocated physical extents */
        uint 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 */
        char vg_uuid[UUID_LEN + 1];     /* volume group UUID */
#ifdef __KERNEL__
        struct proc_dir_entry *vg_dir_pde;
        struct proc_dir_entry *lv_subdir_pde;
        struct proc_dir_entry *pv_subdir_pde;
#else
        char dummy1[200];
#endif
} vg_t;


/* disk */
typedef struct vg_disk_v2 {
        uint8_t vg_uuid[UUID_LEN];      /* volume group UUID */
        uint8_t vg_name_dummy[NAME_LEN - UUID_LEN];     /* rest of v1 VG 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_t;


/*
 * Request structures for ioctls
 */

/* Request structure PV_STATUS_BY_NAME... */
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];
        kdev_t pv_dev;
} 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 {
        uint32_t lv_index;
        lv_t *lv;
        /* Transfer size because user space and kernel space differ */
        ushort size;
} lv_status_byindex_req_t;

/* Request structure LV_STATUS_BYDEV... */
typedef struct {
        dev_t dev;
        lv_t *lv;
} lv_status_bydev_req_t;


/* Request structure LV_SNAPSHOT_USE_RATE */
typedef struct {
        int block;
        int rate;
} lv_snapshot_use_rate_req_t;



/* useful inlines */
static inline ulong round_up(ulong n, ulong size)
{
        size--;
        return (n + size) & ~size;
}

static inline ulong div_up(ulong n, ulong size)
{
        return round_up(n, size) / size;
}

/* FIXME: nasty capital letters */
static int inline LVM_GET_COW_TABLE_CHUNKS_PER_PE(vg_t * vg, lv_t * lv)
{
        return vg->pe_size / lv->lv_chunk_size;
}

static int inline LVM_GET_COW_TABLE_ENTRIES_PER_PE(vg_t * vg, lv_t * lv)
{
        ulong chunks = vg->pe_size / lv->lv_chunk_size;
        ulong entry_size = sizeof(lv_COW_table_disk_t);
        ulong chunk_size = lv->lv_chunk_size * SECTOR_SIZE;
        ulong entries = (vg->pe_size * SECTOR_SIZE) /
            (entry_size + chunk_size);

        if (chunks < 2)
                return 0;

        for (; entries; entries--)
                if ((div_up(entries * entry_size, chunk_size) + entries) <=
                    chunks)
                        break;

        return entries;
}


#endif                          /* #ifndef _LVM_H_INCLUDE */