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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2001-2002 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 "mdadm.h"
#include "md_p.h"
#include <ctype.h>
void make_parts(char *dev, int cnt)
{
/* make 'cnt' partition devices for 'dev'
* We use the major/minor from dev and add 1..cnt
* If dev ends with a digit, we add "p%d" else "%d"
* If the name exists, we use it's owner/mode,
* else that of dev
*/
struct stat stb;
int major, minor;
int i;
char *name = malloc(strlen(dev) + 20);
int dig = isdigit(dev[strlen(dev)-1]);
if (stat(dev, &stb)!= 0)
return;
if (!S_ISBLK(stb.st_mode))
return;
major = major(stb.st_rdev);
minor = minor(stb.st_rdev);
for (i=1; i <= cnt ; i++) {
struct stat stb2;
sprintf(name, "%s%s%d", dev, dig?"p":"", i);
if (stat(name, &stb2)==0) {
if (!S_ISBLK(stb2.st_mode))
continue;
if (stb2.st_rdev == makedev(major, minor+i))
continue;
unlink(name);
} else {
stb2 = stb;
}
mknod(name, S_IFBLK | 0600, makedev(major, minor+i));
chown(name, stb2.st_uid, stb2.st_gid);
chmod(name, stb2.st_mode & 07777);
}
}
/*
* Open a given md device, and check that it really is one.
* If 'autof' is given, then we need to create, or recreate, the md device.
* If the name already exists, and is not a block device, we fail.
* If it exists and is not an md device, is not the right type (partitioned or not),
* or is currently in-use, we remove the device, but remember the owner and mode.
* If it now doesn't exist, we find a new md array and create the device.
* Default ownership is user=0, group=0 perm=0600
*/
int open_mddev(char *dev, int autof)
{
int mdfd;
struct stat stb;
int major = MD_MAJOR;
int minor;
int must_remove = 0;
struct mdstat_ent *mdlist;
int num;
if (autof) {
/* autof is set, so we need to check that the name is ok,
* and possibly create one if not
*/
stb.st_mode = 0;
if (lstat(dev, &stb)==0 && ! S_ISBLK(stb.st_mode)) {
fprintf(stderr, Name ": %s is not a block device.\n",
dev);
return -1;
}
/* check major number is correct */
if (autof>0)
major = get_mdp_major();
if (stb.st_mode && major(stb.st_rdev) != major)
must_remove = 1;
if (stb.st_mode && !must_remove) {
mdu_array_info_t array;
/* looks ok, see if it is available */
mdfd = open(dev, O_RDWR, 0);
if (mdfd < 0) {
fprintf(stderr, Name ": error opening %s: %s\n",
dev, strerror(errno));
return -1;
} else if (md_get_version(mdfd) <= 0) {
fprintf(stderr, Name ": %s does not appear to be an md device\n",
dev);
close(mdfd);
return -1;
}
if (ioctl(mdfd, GET_ARRAY_INFO, &array)==0) {
/* already active */
must_remove = 1;
close(mdfd);
} else {
if (autof > 0)
make_parts(dev, autof);
return mdfd;
}
}
/* Ok, need to find a minor that is not in use.
* If the device name is in a 'standard' format,
* intuit the minor from that, else
* easiest to read /proc/mdstat, and hunt through for
* an unused number
*/
switch(is_standard(dev, &num)) {
case -1: /* non partitioned */
if (autof > 0) {
fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev);
return -1;
}
minor = num;
num = -1-num;
break;
case 1: /* partitioned */
if (autof == -1) {
fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev);
return -1;
}
minor = num << MdpMinorShift;
major = get_mdp_major();
break;
case 0: /* not standard, pick an unused number */
mdlist = mdstat_read(0);
for (num= (autof>0)?-1:0 ; ; num+= (autof>2)?-1:1) {
struct mdstat_ent *me;
for (me=mdlist; me; me=me->next)
if (me->devnum == num)
break;
if (!me) {
/* doesn't exist if mdstat.
* make sure it is new to /dev too
*/
char *dn;
if (autof > 0)
minor = (-1-num) << MdpMinorShift;
else
minor = num;
dn = map_dev(major,minor);
if (dn==NULL || is_standard(dn, NULL)) {
/* this number only used by a 'standard' name,
* so it is safe to use
*/
break;
}
}
}
}
/* major and minor have been chosen */
/* If it was a 'standard' name and it is in-use, then
* the device could already be correct
*/
if (stb.st_mode && major(stb.st_rdev) == major &&
minor(stb.st_rdev) == minor)
;
else {
if (major(makedev(major,minor)) != major ||
minor(makedev(major,minor)) != minor) {
fprintf(stderr, Name ": Need newer C library to use more than 4 partitionable md devices, sorry\n");
return -1;
}
if (must_remove)
unlink(dev);
if (mknod(dev, S_IFBLK|0600, makedev(major, minor))!= 0) {
fprintf(stderr, Name ": failed to create %s\n", dev);
return -1;
}
if (must_remove) {
chown(dev, stb.st_uid, stb.st_gid);
chmod(dev, stb.st_mode & 07777);
}
make_parts(dev,autof);
}
}
mdfd = open(dev, O_RDWR, 0);
if (mdfd < 0)
fprintf(stderr, Name ": error opening %s: %s\n",
dev, strerror(errno));
else if (md_get_version(mdfd) <= 0) {
fprintf(stderr, Name ": %s does not appear to be an md device\n",
dev);
close(mdfd);
mdfd = -1;
}
return mdfd;
}
|
