/usr/include/linux/raid/md_u.h is in linux-libc-dev 3.2.78-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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
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