include/linux/raid/md_u.h

   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__
  70 extern int mdp_major;
  71 #endif
  72
  73 typedef struct mdu_version_s {
  74         int major;
  75         int minor;
  76         int patchlevel;
  77 } mdu_version_t;
  78
  79 typedef 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
 123 typedef 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
 135 typedef 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
 146 typedef struct mdu_bitmap_file_s
 147 {
 148         char pathname[4096];
 149 } mdu_bitmap_file_t;
 150
 151 typedef 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