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/*
md.h : Multiple Devices driver for Linux
Copyright (C) 1994-96 Marc ZYNGIER
<zyngier@ufr-info-p7.ibp.fr> or
<maz@gloups.fdn.fr>
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_INT_H
#define MD_INT_H
/* don't include the kernel RAID header! */
#define _MD_H
typedef unsigned int md_u32;
typedef unsigned short md_u16;
typedef unsigned char md_u8;
#include <linux/major.h>
#include <sys/ioctl.h>
/*
* Different major versions are not compatible.
* Different minor versions are only downward compatible.
* Different patchlevel versions are downward and upward compatible.
*/
struct md_version {
int major;
int minor;
int patchlevel;
};
/*
* default readahead
*/
#define MD_READAHEAD (256 * 1024)
/* These are the ioctls for md versions < 0.50 */
#define REGISTER_MD_DEV _IO (MD_MAJOR, 1)
#define START_MD _IO (MD_MAJOR, 2)
#define STOP_MD _IO (MD_MAJOR, 3)
/* status */
#define RAID_VERSION _IOR (MD_MAJOR, 0x10, struct md_version)
#define GET_ARRAY_INFO _IOR (MD_MAJOR, 0x11, md_array_info_t)
#define GET_DISK_INFO _IOR (MD_MAJOR, 0x12, md_disk_info_t)
#define PRINT_RAID_DEBUG _IO (MD_MAJOR, 0x13)
/* configuration */
#define CLEAR_ARRAY _IO (MD_MAJOR, 0x20)
#define ADD_NEW_DISK _IOW (MD_MAJOR, 0x21, md_disk_info_t)
#define HOT_REMOVE_DISK _IO (MD_MAJOR, 0x22)
#define SET_ARRAY_INFO _IOW (MD_MAJOR, 0x23, md_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)
/* usage */
#define RUN_ARRAY _IOW (MD_MAJOR, 0x30, struct md_param)
#define START_ARRAY _IO (MD_MAJOR, 0x31)
#define STOP_ARRAY _IO (MD_MAJOR, 0x32)
#define STOP_ARRAY_RO _IO (MD_MAJOR, 0x33)
#define RESTART_ARRAY_RW _IO (MD_MAJOR, 0x34)
/* for raid < 0.50 only */
#define MD_PERSONALITY_SHIFT 16
#define MD_RESERVED 0UL
#define LINEAR 1UL
#define STRIPED 2UL
#define RAID0 STRIPED
#define RAID1 3UL
#define RAID5 4UL
#define TRANSLUCENT 5UL
#define LVM 6UL
#define MAX_PERSONALITY 7UL
/*
* MD superblock.
*
* The MD superblock maintains some statistics on each MD configuration.
* Each real device in the MD set contains it near the end of the device.
* Some of the ideas are copied from the ext2fs implementation.
*
* We currently use 4096 bytes as follows:
*
* word offset function
*
* 0 - 31 Constant generic MD device information.
* 32 - 63 Generic state information.
* 64 - 127 Personality specific information.
* 128 - 511 12 32-words descriptors of the disks in the raid set.
* 512 - 911 Reserved.
* 912 - 1023 Disk specific descriptor.
*/
/*
* If x is the real device size in bytes, we return an apparent size of:
*
* y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES
*
* and place the 4kB superblock at offset y.
*/
#define MD_RESERVED_BYTES (64 * 1024)
#define MD_RESERVED_SECTORS (MD_RESERVED_BYTES / 512)
#define MD_RESERVED_BLOCKS (MD_RESERVED_BYTES / BLOCK_SIZE)
#define MD_NEW_SIZE_SECTORS(x) ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
#define MD_NEW_SIZE_BLOCKS(x) ((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS)
#define MD_SB_BYTES 4096
#define MD_SB_WORDS (MD_SB_BYTES / 4)
#define MD_SB_BLOCKS (MD_SB_BYTES / BLOCK_SIZE)
#define MD_SB_SECTORS (MD_SB_BYTES / 512)
/*
* The following are counted in 32-bit words
*/
#define MD_SB_GENERIC_OFFSET 0
#define MD_SB_PERSONALITY_OFFSET 64
#define MD_SB_DISKS_OFFSET 128
#define MD_SB_DESCRIPTOR_OFFSET 992
#define MD_SB_GENERIC_CONSTANT_WORDS 32
#define MD_SB_GENERIC_STATE_WORDS 32
#define MD_SB_GENERIC_WORDS (MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS)
#define MD_SB_PERSONALITY_WORDS 64
#define MD_SB_DISKS_WORDS 384
#define MD_SB_DESCRIPTOR_WORDS 32
#define MD_SB_RESERVED_WORDS (1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS)
#define MD_SB_EQUAL_WORDS (MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS)
#define MD_SB_DISKS (MD_SB_DISKS_WORDS / MD_SB_DESCRIPTOR_WORDS)
/*
* Device "operational" state bits
*/
#define MD_DISK_FAULTY 0 /* disk is faulty / operational */
#define MD_DISK_ACTIVE 1 /* disk is running or spare disk */
#define MD_DISK_SYNC 2 /* disk is in sync with the raid set */
typedef struct md_device_descriptor_s {
md_u32 number; /* 0 Device number in the entire set */
md_u32 major; /* 1 Device major number */
md_u32 minor; /* 2 Device minor number */
md_u32 raid_disk; /* 3 The role of the device in the raid set */
md_u32 state; /* 4 Operational state */
md_u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5];
} md_descriptor_t;
#define MD_SB_MAGIC 0xa92b4efc
/*
* Superblock state bits
*/
#define MD_SB_CLEAN 0
#define MD_SB_ERRORS 1
typedef struct md_superblock_s {
/*
* Constant generic information
*/
md_u32 md_magic; /* 0 MD identifier */
md_u32 major_version; /* 1 major version to which the set conforms */
md_u32 minor_version; /* 2 minor version ... */
md_u32 patch_version; /* 3 patchlevel version ... */
md_u32 gvalid_words; /* 4 Number of used words in this section */
md_u32 set_magic; /* 5 Raid set identifier */
md_u32 ctime; /* 6 Creation time */
md_u32 level; /* 7 Raid personality */
md_u32 size; /* 8 Apparent size of each individual disk */
md_u32 nr_disks; /* 9 total disks in the raid set */
md_u32 raid_disks; /* 10 disks in a fully functional raid set */
md_u32 md_minor; /* 11 preferred MD minor device number */
md_u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 12];
/*
* Generic state information
*/
md_u32 utime; /* 0 Superblock update time */
md_u32 state; /* 1 State bits (clean, ...) */
md_u32 active_disks; /* 2 Number of currently active disks */
md_u32 working_disks; /* 3 Number of working disks */
md_u32 failed_disks; /* 4 Number of failed disks */
md_u32 spare_disks; /* 5 Number of spare disks */
md_u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 6];
/*
* Personality information
*/
md_u32 layout; /* 0 the array's physical layout */
md_u32 chunk_size; /* 1 chunk size in bytes */
md_u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 2];
/*
* Disks information
*/
md_descriptor_t disks[MD_SB_DISKS];
/*
* Reserved
*/
md_u32 reserved[MD_SB_RESERVED_WORDS];
/*
* Active descriptor
*/
md_descriptor_t descriptor;
} md_superblock_t;
/*
* options passed in raidstart:
*/
#define MAX_CHUNK_SIZE (4096*1024)
struct md_param
{
int personality; /* 1,2,3,4 */
int chunk_size; /* in bytes */
int max_fault; /* unused for now */
};
typedef struct md_array_info_s {
/*
* Generic constant information
*/
md_u32 major_version;
md_u32 minor_version;
md_u32 patch_version;
md_u32 ctime;
md_u32 level;
md_u32 size;
md_u32 nr_disks;
md_u32 raid_disks;
md_u32 md_minor;
md_u32 not_persistent;
/*
* Generic state information
*/
md_u32 utime; /* 0 Superblock update time */
md_u32 state; /* 1 State bits (clean, ...) */
md_u32 active_disks; /* 2 Number of currently active disks */
md_u32 working_disks; /* 3 Number of working disks */
md_u32 failed_disks; /* 4 Number of failed disks */
md_u32 spare_disks; /* 5 Number of spare disks */
/*
* Personality information
*/
md_u32 layout; /* 0 the array's physical layout */
md_u32 chunk_size; /* 1 chunk size in bytes */
} md_array_info_t;
typedef struct md_disk_info_s {
/*
* configuration/status of one particular disk
*/
md_u32 number;
md_u32 major;
md_u32 minor;
md_u32 raid_disk;
md_u32 state;
} md_disk_info_t;
/*
* Supported RAID5 algorithms
*/
#define RAID5_ALGORITHM_LEFT_ASYMMETRIC 0
#define RAID5_ALGORITHM_RIGHT_ASYMMETRIC 1
#define RAID5_ALGORITHM_LEFT_SYMMETRIC 2
#define RAID5_ALGORITHM_RIGHT_SYMMETRIC 3
#endif _MD_H
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