LXR linux/include/uapi/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 _UAPI_MD_U_H
  16#define _UAPI_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 RAID_AUTORUN            _IO (MD_MAJOR, 0x14)
  43#define GET_BITMAP_FILE         _IOR (MD_MAJOR, 0x15, mdu_bitmap_file_t)
  44
  45/* configuration */
  46#define CLEAR_ARRAY             _IO (MD_MAJOR, 0x20)
  47#define ADD_NEW_DISK            _IOW (MD_MAJOR, 0x21, mdu_disk_info_t)
  48#define HOT_REMOVE_DISK         _IO (MD_MAJOR, 0x22)
  49#define SET_ARRAY_INFO          _IOW (MD_MAJOR, 0x23, mdu_array_info_t)
  50#define SET_DISK_INFO           _IO (MD_MAJOR, 0x24)
  51#define WRITE_RAID_INFO         _IO (MD_MAJOR, 0x25)
  52#define UNPROTECT_ARRAY         _IO (MD_MAJOR, 0x26)
  53#define PROTECT_ARRAY           _IO (MD_MAJOR, 0x27)
  54#define HOT_ADD_DISK            _IO (MD_MAJOR, 0x28)
  55#define SET_DISK_FAULTY         _IO (MD_MAJOR, 0x29)
  56#define HOT_GENERATE_ERROR      _IO (MD_MAJOR, 0x2a)
  57#define SET_BITMAP_FILE         _IOW (MD_MAJOR, 0x2b, int)
  58
  59/* usage */
  60#define RUN_ARRAY               _IOW (MD_MAJOR, 0x30, mdu_param_t)
  61/*  0x31 was START_ARRAY  */
  62#define STOP_ARRAY              _IO (MD_MAJOR, 0x32)
  63#define STOP_ARRAY_RO           _IO (MD_MAJOR, 0x33)
  64#define RESTART_ARRAY_RW        _IO (MD_MAJOR, 0x34)
  65
  66/* 63 partitions with the alternate major number (mdp) */
  67#define MdpMinorShift 6
  68
  69typedef struct mdu_version_s {
  70        int major;
  71        int minor;
  72        int patchlevel;
  73} mdu_version_t;
  74
  75typedef struct mdu_array_info_s {
  76        /*
  77         * Generic constant information
  78         */
  79        int major_version;
  80        int minor_version;
  81        int patch_version;
  82        int ctime;
  83        int level;
  84        int size;
  85        int nr_disks;
  86        int raid_disks;
  87        int md_minor;
  88        int not_persistent;
  89
  90        /*
  91         * Generic state information
  92         */
  93        int utime;              /*  0 Superblock update time                  */
  94        int state;              /*  1 State bits (clean, ...)                 */
  95        int active_disks;       /*  2 Number of currently active disks        */
  96        int working_disks;      /*  3 Number of working disks                 */
  97        int failed_disks;       /*  4 Number of failed disks                  */
  98        int spare_disks;        /*  5 Number of spare disks                   */
  99
 100        /*
 101         * Personality information
 102         */
 103        int layout;             /*  0 the array's physical layout             */
 104        int chunk_size; /*  1 chunk size in bytes                     */
 105
 106} mdu_array_info_t;
 107
 108/* non-obvious values for 'level' */
 109#define LEVEL_MULTIPATH         (-4)
 110#define LEVEL_LINEAR            (-1)
 111#define LEVEL_FAULTY            (-5)
 112
 113/* we need a value for 'no level specified' and 0
 114 * means 'raid0', so we need something else.  This is
 115 * for internal use only
 116 */
 117#define LEVEL_NONE              (-1000000)
 118
 119typedef struct mdu_disk_info_s {
 120        /*
 121         * configuration/status of one particular disk
 122         */
 123        int number;
 124        int major;
 125        int minor;
 126        int raid_disk;
 127        int state;
 128
 129} mdu_disk_info_t;
 130
 131typedef struct mdu_start_info_s {
 132        /*
 133         * configuration/status of one particular disk
 134         */
 135        int major;
 136        int minor;
 137        int raid_disk;
 138        int state;
 139
 140} mdu_start_info_t;
 141
 142typedef struct mdu_bitmap_file_s
 143{
 144        char pathname[4096];
 145} mdu_bitmap_file_t;
 146
 147typedef struct mdu_param_s
 148{
 149        int                     personality;    /* 1,2,3,4 */
 150        int                     chunk_size;     /* in bytes */
 151        int                     max_fault;      /* unused for now */
 152} mdu_param_t;
 153
 154#endif /* _UAPI_MD_U_H */
 155