LXR linux/include/uapi/linux/raid/md

   1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2/*
   3   md_u.h : user <=> kernel API between Linux raidtools and RAID drivers
   4          Copyright (C) 1998 Ingo Molnar
   5          
   6   This program is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation; either version 2, or (at your option)
   9   any later version.
  10   
  11   You should have received a copy of the GNU General Public License
  12   (for example /usr/src/linux/COPYING); if not, write to the Free
  13   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
  14*/
  15
  16#ifndef _UAPI_MD_U_H
  17#define _UAPI_MD_U_H
  18
  19/*
  20 * Different major versions are not compatible.
  21 * Different minor versions are only downward compatible.
  22 * Different patchlevel versions are downward and upward compatible.
  23 */
  24#define MD_MAJOR_VERSION                0
  25#define MD_MINOR_VERSION                90
  26/*
  27 * MD_PATCHLEVEL_VERSION indicates kernel functionality.
  28 * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
  29 *     and major_version/minor_version accordingly
  30 * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
  31 *     in the super status byte
  32 * >=3 means that bitmap superblock version 4 is supported, which uses
  33 *     little-ending representation rather than host-endian
  34 */
  35#define MD_PATCHLEVEL_VERSION           3
  36
  37/* ioctls */
  38
  39/* status */
  40#define RAID_VERSION            _IOR (MD_MAJOR, 0x10, mdu_version_t)
  41#define GET_ARRAY_INFO          _IOR (MD_MAJOR, 0x11, mdu_array_info_t)
  42#define GET_DISK_INFO           _IOR (MD_MAJOR, 0x12, mdu_disk_info_t)
  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#define CLUSTERED_DISK_NACK     _IO (MD_MAJOR, 0x35)
  67
  68/* 63 partitions with the alternate major number (mdp) */
  69#define MdpMinorShift 6
  70
  71typedef struct mdu_version_s {
  72        int major;
  73        int minor;
  74        int patchlevel;
  75} mdu_version_t;
  76
  77typedef struct mdu_array_info_s {
  78        /*
  79         * Generic constant information
  80         */
  81        int major_version;
  82        int minor_version;
  83        int patch_version;
  84        unsigned int ctime;
  85        int level;
  86        int size;
  87        int nr_disks;
  88        int raid_disks;
  89        int md_minor;
  90        int not_persistent;
  91
  92        /*
  93         * Generic state information
  94         */
  95        unsigned int utime;     /*  0 Superblock update time                  */
  96        int state;              /*  1 State bits (clean, ...)                 */
  97        int active_disks;       /*  2 Number of currently active disks        */
  98        int working_disks;      /*  3 Number of working disks                 */
  99        int failed_disks;       /*  4 Number of failed disks                  */
 100        int spare_disks;        /*  5 Number of spare disks                   */
 101
 102        /*
 103         * Personality information
 104         */
 105        int layout;             /*  0 the array's physical layout             */
 106        int chunk_size; /*  1 chunk size in bytes                     */
 107
 108} mdu_array_info_t;
 109
 110/* non-obvious values for 'level' */
 111#define LEVEL_MULTIPATH         (-4)
 112#define LEVEL_LINEAR            (-1)
 113#define LEVEL_FAULTY            (-5)
 114
 115/* we need a value for 'no level specified' and 0
 116 * means 'raid0', so we need something else.  This is
 117 * for internal use only
 118 */
 119#define LEVEL_NONE              (-1000000)
 120
 121typedef struct mdu_disk_info_s {
 122        /*
 123         * configuration/status of one particular disk
 124         */
 125        int number;
 126        int major;
 127        int minor;
 128        int raid_disk;
 129        int state;
 130
 131} mdu_disk_info_t;
 132
 133typedef struct mdu_start_info_s {
 134        /*
 135         * configuration/status of one particular disk
 136         */
 137        int major;
 138        int minor;
 139        int raid_disk;
 140        int state;
 141
 142} mdu_start_info_t;
 143
 144typedef struct mdu_bitmap_file_s
 145{
 146        char pathname[4096];
 147} mdu_bitmap_file_t;
 148
 149typedef struct mdu_param_s
 150{
 151        int                     personality;    /* 1,2,3,4 */
 152        int                     chunk_size;     /* in bytes */
 153        int                     max_fault;      /* unused for now */
 154} mdu_param_t;
 155
 156#endif /* _UAPI_MD_U_H */
 157