LXR linux/include/linux/raid/md

   1/*
   2   md_u.h : user <=> kernel API between Linux raidtools and RAID drivers
   3          Copyright (C) 1998 Ingo Molnar
   4          
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 2, or (at your option)
   8   any later version.
   9   
  10   You should have received a copy of the GNU General Public License
  11   (for example /usr/src/linux/COPYING); if not, write to the Free
  12   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
  13*/
  14
  15#ifndef _MD_U_H
  16#define _MD_U_H
  17
  18/*
  19 * Different major versions are not compatible.
  20 * Different minor versions are only downward compatible.
  21 * Different patchlevel versions are downward and upward compatible.
  22 */
  23#define MD_MAJOR_VERSION                0
  24#define MD_MINOR_VERSION                90
  25/*
  26 * MD_PATCHLEVEL_VERSION indicates kernel functionality.
  27 * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
  28 *     and major_version/minor_version accordingly
  29 * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
  30 *     in the super status byte
  31 * >=3 means that bitmap superblock version 4 is supported, which uses
  32 *     little-ending representation rather than host-endian
  33 */
  34#define MD_PATCHLEVEL_VERSION           3
  35
  36/* ioctls */
  37
  38/* status */
  39#define RAID_VERSION            _IOR (MD_MAJOR, 0x10, mdu_version_t)
  40#define GET_ARRAY_INFO          _IOR (MD_MAJOR, 0x11, mdu_array_info_t)
  41#define GET_DISK_INFO           _IOR (MD_MAJOR, 0x12, mdu_disk_info_t)
  42#define PRINT_RAID_DEBUG        _IO (MD_MAJOR, 0x13)
  43#define RAID_AUTORUN            _IO (MD_MAJOR, 0x14)
  44#define GET_BITMAP_FILE         _IOR (MD_MAJOR, 0x15, mdu_bitmap_file_t)
  45
  46/* configuration */
  47#define CLEAR_ARRAY             _IO (MD_MAJOR, 0x20)
  48#define ADD_NEW_DISK            _IOW (MD_MAJOR, 0x21, mdu_disk_info_t)
  49#define HOT_REMOVE_DISK         _IO (MD_MAJOR, 0x22)
  50#define SET_ARRAY_INFO          _IOW (MD_MAJOR, 0x23, mdu_array_info_t)
  51#define SET_DISK_INFO           _IO (MD_MAJOR, 0x24)
  52#define WRITE_RAID_INFO         _IO (MD_MAJOR, 0x25)
  53#define UNPROTECT_ARRAY         _IO (MD_MAJOR, 0x26)
  54#define PROTECT_ARRAY           _IO (MD_MAJOR, 0x27)
  55#define HOT_ADD_DISK            _IO (MD_MAJOR, 0x28)
  56#define SET_DISK_FAULTY         _IO (MD_MAJOR, 0x29)
  57#define HOT_GENERATE_ERROR      _IO (MD_MAJOR, 0x2a)
  58#define SET_BITMAP_FILE         _IOW (MD_MAJOR, 0x2b, int)
  59
  60/* usage */
  61#define RUN_ARRAY               _IOW (MD_MAJOR, 0x30, mdu_param_t)
  62/*  0x31 was START_ARRAY  */
  63#define STOP_ARRAY              _IO (MD_MAJOR, 0x32)
  64#define STOP_ARRAY_RO           _IO (MD_MAJOR, 0x33)
  65#define RESTART_ARRAY_RW        _IO (MD_MAJOR, 0x34)
  66
  67/* 63 partitions with the alternate major number (mdp) */
  68#define MdpMinorShift 6
  69#ifdef __KERNEL__
  70extern int mdp_major;
  71#endif
  72
  73typedef struct mdu_version_s {
  74        int major;
  75        int minor;
  76        int patchlevel;
  77} mdu_version_t;
  78
  79typedef struct mdu_array_info_s {
  80        /*
  81         * Generic constant information
  82         */
  83        int major_version;
  84        int minor_version;
  85        int patch_version;
  86        int ctime;
  87        int level;
  88        int size;
  89        int nr_disks;
  90        int raid_disks;
  91        int md_minor;
  92        int not_persistent;
  93
  94        /*
  95         * Generic state information
  96         */
  97        int utime;              /*  0 Superblock update time                  */
  98        int state;              /*  1 State bits (clean, ...)                 */
  99        int active_disks;       /*  2 Number of currently active disks        */
 100        int working_disks;      /*  3 Number of working disks                 */
 101        int failed_disks;       /*  4 Number of failed disks                  */
 102        int spare_disks;        /*  5 Number of spare disks                   */
 103
 104        /*
 105         * Personality information
 106         */
 107        int layout;             /*  0 the array's physical layout             */
 108        int chunk_size; /*  1 chunk size in bytes                     */
 109
 110} mdu_array_info_t;
 111
 112/* non-obvious values for 'level' */
 113#define LEVEL_MULTIPATH         (-4)
 114#define LEVEL_LINEAR            (-1)
 115#define LEVEL_FAULTY            (-5)
 116
 117/* we need a value for 'no level specified' and 0
 118 * means 'raid0', so we need something else.  This is
 119 * for internal use only
 120 */
 121#define LEVEL_NONE              (-1000000)
 122
 123typedef struct mdu_disk_info_s {
 124        /*
 125         * configuration/status of one particular disk
 126         */
 127        int number;
 128        int major;
 129        int minor;
 130        int raid_disk;
 131        int state;
 132
 133} mdu_disk_info_t;
 134
 135typedef struct mdu_start_info_s {
 136        /*
 137         * configuration/status of one particular disk
 138         */
 139        int major;
 140        int minor;
 141        int raid_disk;
 142        int state;
 143
 144} mdu_start_info_t;
 145
 146typedef struct mdu_bitmap_file_s
 147{
 148        char pathname[4096];
 149} mdu_bitmap_file_t;
 150
 151typedef struct mdu_param_s
 152{
 153        int                     personality;    /* 1,2,3,4 */
 154        int                     chunk_size;     /* in bytes */
 155        int                     max_fault;      /* unused for now */
 156} mdu_param_t;
 157
 158#endif 
 159
 160