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/*

   md_u.h : user <=> kernel API between Linux raidtools and RAID drivers

          Copyright (C) 1998 Ingo Molnar

   This program 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.

   You should have received a copy of the GNU General Public License

   (for example /usr/src/linux/COPYING); if not, write to the Free

   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef _MD_U_H

#define _MD_U_H

/*

 * Different major versions are not compatible.

 * Different minor versions are only downward compatible.

 * Different patchlevel versions are downward and upward compatible.

 */

#define MD_MAJOR_VERSION                0

#define MD_MINOR_VERSION                90

/*

 * MD_PATCHLEVEL_VERSION indicates kernel functionality.

 * >=1 means different superblock formats are selectable using SET_ARRAY_INFO

 *     and major_version/minor_version accordingly

 * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT

 *     in the super status byte

 * >=3 means that bitmap superblock version 4 is supported, which uses

 *     little-ending representation rather than host-endian

 */

#define MD_PATCHLEVEL_VERSION           3

/* ioctls */

/* status */

#define RAID_VERSION            _IOR (MD_MAJOR, 0x10, mdu_version_t)

#define GET_ARRAY_INFO          _IOR (MD_MAJOR, 0x11, mdu_array_info_t)

#define GET_DISK_INFO           _IOR (MD_MAJOR, 0x12, mdu_disk_info_t)

#define PRINT_RAID_DEBUG        _IO (MD_MAJOR, 0x13)

#define RAID_AUTORUN            _IO (MD_MAJOR, 0x14)

#define GET_BITMAP_FILE         _IOR (MD_MAJOR, 0x15, mdu_bitmap_file_t)

/* configuration */

#define CLEAR_ARRAY             _IO (MD_MAJOR, 0x20)

#define ADD_NEW_DISK            _IOW (MD_MAJOR, 0x21, mdu_disk_info_t)

#define HOT_REMOVE_DISK         _IO (MD_MAJOR, 0x22)

#define SET_ARRAY_INFO          _IOW (MD_MAJOR, 0x23, mdu_array_info_t)

#define SET_DISK_INFO           _IO (MD_MAJOR, 0x24)

#define WRITE_RAID_INFO         _IO (MD_MAJOR, 0x25)

#define UNPROTECT_ARRAY         _IO (MD_MAJOR, 0x26)

#define PROTECT_ARRAY           _IO (MD_MAJOR, 0x27)

#define HOT_ADD_DISK            _IO (MD_MAJOR, 0x28)

#define SET_DISK_FAULTY         _IO (MD_MAJOR, 0x29)

#define HOT_GENERATE_ERROR      _IO (MD_MAJOR, 0x2a)

#define SET_BITMAP_FILE         _IOW (MD_MAJOR, 0x2b, int)

/* usage */

#define RUN_ARRAY               _IOW (MD_MAJOR, 0x30, mdu_param_t)

/*  0x31 was START_ARRAY  */

#define STOP_ARRAY              _IO (MD_MAJOR, 0x32)

#define STOP_ARRAY_RO           _IO (MD_MAJOR, 0x33)

#define RESTART_ARRAY_RW        _IO (MD_MAJOR, 0x34)

/* 63 partitions with the alternate major number (mdp) */

#define MdpMinorShift 6

typedef struct mdu_version_s {

        int major;

        int minor;

        int patchlevel;

} mdu_version_t;

typedef struct mdu_array_info_s {

        /*

         * Generic constant information

         */

        int major_version;

        int minor_version;

        int patch_version;

        int ctime;

        int level;

        int size;

        int nr_disks;

        int raid_disks;

        int md_minor;

        int not_persistent;

        /*

         * Generic state information

         */

        int utime;              /*  0 Superblock update time                  */

        int state;              /*  1 State bits (clean, ...)                 */

        int active_disks;       /*  2 Number of currently active disks        */

        int working_disks;      /*  3 Number of working disks                 */

        int failed_disks;       /*  4 Number of failed disks                  */

        int spare_disks;        /*  5 Number of spare disks                   */

        /*

         * Personality information

         */

        int layout;             /*  0 the array's physical layout             */

        int chunk_size; /*  1 chunk size in bytes                     */

} mdu_array_info_t;

/* non-obvious values for 'level' */

#define LEVEL_MULTIPATH         (-4)

#define LEVEL_LINEAR            (-1)

#define LEVEL_FAULTY            (-5)

/* we need a value for 'no level specified' and 0

 * means 'raid0', so we need something else.  This is

 * for internal use only

 */

#define LEVEL_NONE              (-1000000)

typedef struct mdu_disk_info_s {

        /*

         * configuration/status of one particular disk

         */

        int number;

        int major;

        int minor;

        int raid_disk;

        int state;

} mdu_disk_info_t;

typedef struct mdu_start_info_s {

        /*

         * configuration/status of one particular disk

         */

        int major;

        int minor;

        int raid_disk;

        int state;

} mdu_start_info_t;

typedef struct mdu_bitmap_file_s

{

        char pathname[4096];

} mdu_bitmap_file_t;

typedef struct mdu_param_s

{

        int                     personality;    /* 1,2,3,4 */

        int                     chunk_size;     /* in bytes */

        int                     max_fault;      /* unused for now */

} mdu_param_t;

#endif /* _MD_U_H */