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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 #define CLUSTERED_DISK_NACK	_IO (MD_MAJOR, 0x35)
66 
67 /* 63 partitions with the alternate major number (mdp) */
68 #define MdpMinorShift 6
69 
70 typedef struct mdu_version_s {
71 	int major;
72 	int minor;
73 	int patchlevel;
74 } mdu_version_t;
75 
76 typedef struct mdu_array_info_s {
77 	/*
78 	 * Generic constant information
79 	 */
80 	int major_version;
81 	int minor_version;
82 	int patch_version;
83 	unsigned int ctime;
84 	int level;
85 	int size;
86 	int nr_disks;
87 	int raid_disks;
88 	int md_minor;
89 	int not_persistent;
90 
91 	/*
92 	 * Generic state information
93 	 */
94 	unsigned int utime;	/*  0 Superblock update time		      */
95 	int state;		/*  1 State bits (clean, ...)		      */
96 	int active_disks;	/*  2 Number of currently active disks	      */
97 	int working_disks;	/*  3 Number of working disks		      */
98 	int failed_disks;	/*  4 Number of failed disks		      */
99 	int spare_disks;	/*  5 Number of spare disks		      */
100 
101 	/*
102 	 * Personality information
103 	 */
104 	int layout;		/*  0 the array's physical layout	      */
105 	int chunk_size;	/*  1 chunk size in bytes		      */
106 
107 } mdu_array_info_t;
108 
109 /* non-obvious values for 'level' */
110 #define	LEVEL_MULTIPATH		(-4)
111 #define	LEVEL_LINEAR		(-1)
112 #define	LEVEL_FAULTY		(-5)
113 
114 /* we need a value for 'no level specified' and 0
115  * means 'raid0', so we need something else.  This is
116  * for internal use only
117  */
118 #define	LEVEL_NONE		(-1000000)
119 
120 typedef struct mdu_disk_info_s {
121 	/*
122 	 * configuration/status of one particular disk
123 	 */
124 	int number;
125 	int major;
126 	int minor;
127 	int raid_disk;
128 	int state;
129 
130 } mdu_disk_info_t;
131 
132 typedef struct mdu_start_info_s {
133 	/*
134 	 * configuration/status of one particular disk
135 	 */
136 	int major;
137 	int minor;
138 	int raid_disk;
139 	int state;
140 
141 } mdu_start_info_t;
142 
143 typedef struct mdu_bitmap_file_s
144 {
145 	char pathname[4096];
146 } mdu_bitmap_file_t;
147 
148 typedef struct mdu_param_s
149 {
150 	int			personality;	/* 1,2,3,4 */
151 	int			chunk_size;	/* in bytes */
152 	int			max_fault;	/* unused for now */
153 } mdu_param_t;
154 
155 #endif /* _UAPI_MD_U_H */
156