2
* mdadm - manage Linux "md" devices aka RAID arrays.
4
* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
7
* This program is free software; you can redistribute it and/or modify
8
* it under the terms of the GNU General Public License as published by
9
* the Free Software Foundation; either version 2 of the License, or
10
* (at your option) any later version.
12
* This program is distributed in the hope that it will be useful,
13
* but WITHOUT ANY WARRANTY; without even the implied warranty of
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15
* GNU General Public License for more details.
17
* You should have received a copy of the GNU General Public License
18
* along with this program; if not, write to the Free Software
19
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22
* Email: <neilb@cse.unsw.edu.au>
24
* School of Computer Science and Engineering
25
* The University of New South Wales
34
void make_parts(char *dev, int cnt)
36
/* make 'cnt' partition devices for 'dev'
37
* We use the major/minor from dev and add 1..cnt
38
* If dev ends with a digit, we add "p%d" else "%d"
39
* If the name exists, we use it's owner/mode,
45
int nlen = strlen(dev) + 20;
46
char *name = malloc(nlen);
47
int dig = isdigit(dev[strlen(dev)-1]);
49
if (stat(dev, &stb)!= 0)
51
if (!S_ISBLK(stb.st_mode))
53
major = major(stb.st_rdev);
54
minor = minor(stb.st_rdev);
55
for (i=1; i <= cnt ; i++) {
57
snprintf(name, nlen, "%s%s%d", dev, dig?"p":"", i);
58
if (stat(name, &stb2)==0) {
59
if (!S_ISBLK(stb2.st_mode))
61
if (stb2.st_rdev == makedev(major, minor+i))
67
mknod(name, S_IFBLK | 0600, makedev(major, minor+i));
68
chown(name, stb2.st_uid, stb2.st_gid);
69
chmod(name, stb2.st_mode & 07777);
71
add_dev(name, &stb2, 0, NULL);
76
* Open a given md device, and check that it really is one.
77
* If 'autof' is given, then we need to create, or recreate, the md device.
78
* If the name already exists, and is not a block device, we fail.
79
* If it exists and is not an md device, is not the right type (partitioned or not),
80
* or is currently in-use, we remove the device, but remember the owner and mode.
81
* If it now doesn't exist, we find a new md array and create the device.
82
* Default ownership is user=0, group=0 perm=0600
84
int open_mddev(char *dev, int autof)
91
struct mdstat_ent *mdlist;
95
/* autof is set, so we need to check that the name is ok,
96
* and possibly create one if not
98
if (autof == -2 && !is_standard(dev, NULL)) {
99
fprintf(stderr, Name ": --auto=yes requires a 'standard' md device name, not %s\n", dev);
103
if (stat(dev, &stb)==0 && ! S_ISBLK(stb.st_mode)) {
104
fprintf(stderr, Name ": %s is not a block device.\n",
108
/* check major number is correct */
110
major = get_mdp_major();
111
if (stb.st_mode && major(stb.st_rdev) != major)
113
if (stb.st_mode && !must_remove) {
114
mdu_array_info_t array;
115
/* looks ok, see if it is available */
116
mdfd = open(dev, O_RDWR, 0);
118
fprintf(stderr, Name ": error opening %s: %s\n",
119
dev, strerror(errno));
121
} else if (md_get_version(mdfd) <= 0) {
122
fprintf(stderr, Name ": %s does not appear to be an md device\n",
127
if (ioctl(mdfd, GET_ARRAY_INFO, &array)==0) {
133
make_parts(dev, autof);
137
/* Ok, need to find a minor that is not in use.
138
* If the device name is in a 'standard' format,
139
* intuit the minor from that, else
140
* easiest to read /proc/mdstat, and hunt through for
143
switch(is_standard(dev, &num)) {
144
case -1: /* non partitioned */
146
fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev);
152
case 1: /* partitioned */
154
fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev);
157
minor = num << MdpMinorShift;
158
major = get_mdp_major();
160
case 0: /* not standard, pick an unused number */
161
mdlist = mdstat_read(0);
162
for (num= (autof>0)?-1:0 ; ; num+= (autof>2)?-1:1) {
163
struct mdstat_ent *me;
164
for (me=mdlist; me; me=me->next)
165
if (me->devnum == num)
168
/* doesn't exist if mdstat.
169
* make sure it is new to /dev too
173
minor = (-1-num) << MdpMinorShift;
176
dn = map_dev(major,minor);
177
if (dn==NULL || is_standard(dn, NULL)) {
178
/* this number only used by a 'standard' name,
179
* so it is safe to use
186
/* major and minor have been chosen */
188
/* If it was a 'standard' name and it is in-use, then
189
* the device could already be correct
191
if (stb.st_mode && major(stb.st_rdev) == major &&
192
minor(stb.st_rdev) == minor)
195
if (major(makedev(major,minor)) != major ||
196
minor(makedev(major,minor)) != minor) {
197
fprintf(stderr, Name ": Need newer C library to use more than 4 partitionable md devices, sorry\n");
203
if (mknod(dev, S_IFBLK|0600, makedev(major, minor))!= 0) {
204
fprintf(stderr, Name ": failed to create %s\n", dev);
208
chown(dev, stb.st_uid, stb.st_gid);
209
chmod(dev, stb.st_mode & 07777);
212
add_dev(dev, &stb, 0, NULL);
213
make_parts(dev,autof);
216
mdfd = open(dev, O_RDWR, 0);
218
fprintf(stderr, Name ": error opening %s: %s\n",
219
dev, strerror(errno));
220
else if (md_get_version(mdfd) <= 0) {
221
fprintf(stderr, Name ": %s does not appear to be an md device\n",