1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
* mdctl - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2001 Neil Brown <neilb@cse.unsw.edu.au>
*
*
* 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 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Neil Brown
* Email: <neilb@cse.unsw.edu.au>
* Paper: Neil Brown
* School of Computer Science and Engineering
* The University of New South Wales
* Sydney, 2052
* Australia
*/
#include "mdctl.h"
#define REGISTER_DEV _IO (MD_MAJOR, 1)
#define START_MD _IO (MD_MAJOR, 2)
#define STOP_MD _IO (MD_MAJOR, 3)
int Build(char *mddev, int mdfd, int chunk, int level,
int raiddisks,
int subdevs, char *subdev[])
{
/* Build a linear or raid0 arrays without superblocks
* We cannot really do any checks, we just do it.
* For md_version < 0.90.0, we call REGISTER_DEV
* with the device numbers, and then
* START_MD giving the "geometry"
* geometry is 0xpp00cc
* where pp is personality: 1==linear, 2=raid0
* cc = chunk size factor: 0==4k, 1==8k etc.
*
* For md_version >= 0.90.0 we call
* SET_ARRAY_INFO, ADD_NEW_DISK, RUN_ARRAY
*
*/
int i;
int vers;
struct stat stb;
if (raiddisks != subdevs) {
fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
raiddisks, subdevs);
return 1;
}
/* scan all devices, make sure they really are block devices */
for (i=0; i<subdevs; i++) {
if (stat(subdev[i], &stb)) {
fprintf(stderr, Name ": Cannot find %s: %s\n",
subdev[i], strerror(errno));
return 1;
}
if ((stb.st_mode & S_IFMT) != S_IFBLK) {
fprintf(stderr, Name ": %s is not a block device.\n",
subdev[i]);
return 1;
}
}
vers = md_get_version(mdfd);
/* looks Ok, go for it */
if (vers >= 90000) {
mdu_array_info_t array;
array.level = level;
array.size = 0;
array.nr_disks = raiddisks;
array.raid_disks = raiddisks;
array.md_minor = 0;
if (fstat(mdfd, &stb)==0)
array.md_minor = MINOR(stb.st_rdev);
array.not_persistent = 0;
array.state = 0; /* not clean, but no errors */
array.active_disks = raiddisks;
array.working_disks = raiddisks;
array.spare_disks = 0;
array.failed_disks = 0;
array.chunk_size = chunk*1024;
if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
mddev, strerror(errno));
return 1;
}
}
/* now add the devices */
for (i=0; i<subdevs; i++) {
if (stat(subdev[i], &stb)) {
fprintf(stderr, Name ": Wierd: %s has disappeared.\n",
subdev[i]);
goto abort;
}
if ((stb.st_rdev & S_IFMT)!= S_IFBLK) {
fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
subdev[i]);
goto abort;
}
if (vers> 90000) {
mdu_disk_info_t disk;
disk.number = i;
disk.raid_disk = i;
disk.state = 6;
disk.major = MAJOR(stb.st_rdev);
disk.minor = MINOR(stb.st_rdev);
if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
subdev[i], strerror(errno));
goto abort;
}
} else {
if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
fprintf(stderr, Name ": REGISTER_DEV failed for %s.\n",
subdev[i], strerror(errno));
goto abort;
}
}
}
/* now to start it */
if (vers > 90000) {
mdu_param_t param; /* not used by syscall */
if (ioctl(mdfd, RUN_ARRAY, param)) {
fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
strerror(errno));
goto abort;
}
} else {
int arg;
arg=0;
while (chunk > 4096) {
arg++;
chunk >>= 1;
}
if (level == 0)
chunk |= 0x20000;
else chunk |= 0x10000;
if (ioctl(mdfd, START_MD, arg)) {
fprintf(stderr, Name ": START_MD failed: %s\n",
strerror(errno));
goto abort;
}
}
fprintf(stderr, Name ": array %s built and started.\n",
mddev);
return 0;
abort:
if (vers > 900000)
ioctl(mdfd, STOP_ARRAY, 0);
else
ioctl(mdfd, STOP_MD, 0);
return 1;
}
|
