]>
Commit | Line | Data |
---|---|---|
b5e64645 NB |
1 | /* |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au> | |
5 | * | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | * | |
21 | * Author: Neil Brown | |
22 | * Email: <neilb@cse.unsw.edu.au> | |
23 | * Paper: Neil Brown | |
24 | * School of Computer Science and Engineering | |
25 | * The University of New South Wales | |
26 | * Sydney, 2052 | |
27 | * Australia | |
28 | */ | |
29 | ||
30 | #include "mdadm.h" | |
31 | #include "md_p.h" | |
32 | #include <ctype.h> | |
33 | ||
34 | void make_parts(char *dev, int cnt) | |
35 | { | |
36 | /* make 'cnt' partition devices for 'dev' | |
37 | * We use the major/minor from dev and add 1..cnt | |
8d80900b | 38 | * If dev ends with a digit, we add "p%d" else "%d" |
b5e64645 NB |
39 | * If the name exists, we use it's owner/mode, |
40 | * else that of dev | |
41 | */ | |
42 | struct stat stb; | |
43 | int major, minor; | |
44 | int i; | |
8f23b0b3 NB |
45 | int nlen = strlen(dev) + 20; |
46 | char *name = malloc(nlen); | |
b5e64645 NB |
47 | int dig = isdigit(dev[strlen(dev)-1]); |
48 | ||
49 | if (stat(dev, &stb)!= 0) | |
50 | return; | |
51 | if (!S_ISBLK(stb.st_mode)) | |
52 | return; | |
0df46c2a NB |
53 | major = major(stb.st_rdev); |
54 | minor = minor(stb.st_rdev); | |
b5e64645 NB |
55 | for (i=1; i <= cnt ; i++) { |
56 | struct stat stb2; | |
8f23b0b3 | 57 | snprintf(name, nlen, "%s%s%d", dev, dig?"p":"", i); |
b5e64645 NB |
58 | if (stat(name, &stb2)==0) { |
59 | if (!S_ISBLK(stb2.st_mode)) | |
60 | continue; | |
0df46c2a | 61 | if (stb2.st_rdev == makedev(major, minor+i)) |
b5e64645 NB |
62 | continue; |
63 | unlink(name); | |
64 | } else { | |
65 | stb2 = stb; | |
66 | } | |
1e0d770c NB |
67 | if (mknod(name, S_IFBLK | 0600, makedev(major, minor+i))) |
68 | perror("mknod"); | |
69 | if (chown(name, stb2.st_uid, stb2.st_gid)) | |
70 | perror("chown"); | |
71 | if (chmod(name, stb2.st_mode & 07777)) | |
72 | perror("chmod"); | |
173fc515 NB |
73 | stat(name, &stb2); |
74 | add_dev(name, &stb2, 0, NULL); | |
b5e64645 NB |
75 | } |
76 | } | |
77 | ||
78 | /* | |
79 | * Open a given md device, and check that it really is one. | |
80 | * If 'autof' is given, then we need to create, or recreate, the md device. | |
81 | * If the name already exists, and is not a block device, we fail. | |
82 | * If it exists and is not an md device, is not the right type (partitioned or not), | |
83 | * or is currently in-use, we remove the device, but remember the owner and mode. | |
8d80900b | 84 | * If it now doesn't exist, we find a new md array and create the device. |
b5e64645 NB |
85 | * Default ownership is user=0, group=0 perm=0600 |
86 | */ | |
87 | int open_mddev(char *dev, int autof) | |
88 | { | |
89 | int mdfd; | |
90 | struct stat stb; | |
91 | int major = MD_MAJOR; | |
a0ef61bf | 92 | int minor = 0; |
b5e64645 NB |
93 | int must_remove = 0; |
94 | struct mdstat_ent *mdlist; | |
95 | int num; | |
96 | ||
97 | if (autof) { | |
98 | /* autof is set, so we need to check that the name is ok, | |
99 | * and possibly create one if not | |
100 | */ | |
48f7b27a NB |
101 | if (autof == -2 && !is_standard(dev, NULL)) { |
102 | fprintf(stderr, Name ": --auto=yes requires a 'standard' md device name, not %s\n", dev); | |
103 | return -1; | |
104 | } | |
b5e64645 | 105 | stb.st_mode = 0; |
0bbc98b5 | 106 | if (stat(dev, &stb)==0 && ! S_ISBLK(stb.st_mode)) { |
b5e64645 NB |
107 | fprintf(stderr, Name ": %s is not a block device.\n", |
108 | dev); | |
109 | return -1; | |
110 | } | |
111 | /* check major number is correct */ | |
112 | if (autof>0) | |
113 | major = get_mdp_major(); | |
0df46c2a | 114 | if (stb.st_mode && major(stb.st_rdev) != major) |
b5e64645 NB |
115 | must_remove = 1; |
116 | if (stb.st_mode && !must_remove) { | |
117 | mdu_array_info_t array; | |
118 | /* looks ok, see if it is available */ | |
119 | mdfd = open(dev, O_RDWR, 0); | |
120 | if (mdfd < 0) { | |
121 | fprintf(stderr, Name ": error opening %s: %s\n", | |
122 | dev, strerror(errno)); | |
123 | return -1; | |
124 | } else if (md_get_version(mdfd) <= 0) { | |
125 | fprintf(stderr, Name ": %s does not appear to be an md device\n", | |
126 | dev); | |
127 | close(mdfd); | |
128 | return -1; | |
129 | } | |
130 | if (ioctl(mdfd, GET_ARRAY_INFO, &array)==0) { | |
131 | /* already active */ | |
132 | must_remove = 1; | |
133 | close(mdfd); | |
134 | } else { | |
135 | if (autof > 0) | |
136 | make_parts(dev, autof); | |
137 | return mdfd; | |
138 | } | |
139 | } | |
140 | /* Ok, need to find a minor that is not in use. | |
8d80900b NB |
141 | * If the device name is in a 'standard' format, |
142 | * intuit the minor from that, else | |
143 | * easiest to read /proc/mdstat, and hunt through for | |
b5e64645 NB |
144 | * an unused number |
145 | */ | |
8d80900b NB |
146 | switch(is_standard(dev, &num)) { |
147 | case -1: /* non partitioned */ | |
148 | if (autof > 0) { | |
149 | fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev); | |
150 | return -1; | |
151 | } | |
152 | minor = num; | |
153 | num = -1-num; | |
154 | break; | |
155 | case 1: /* partitioned */ | |
156 | if (autof == -1) { | |
157 | fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev); | |
158 | return -1; | |
159 | } | |
160 | minor = num << MdpMinorShift; | |
161 | major = get_mdp_major(); | |
162 | break; | |
163 | case 0: /* not standard, pick an unused number */ | |
22a88995 | 164 | mdlist = mdstat_read(0, 0); |
8d80900b NB |
165 | for (num= (autof>0)?-1:0 ; ; num+= (autof>2)?-1:1) { |
166 | struct mdstat_ent *me; | |
167 | for (me=mdlist; me; me=me->next) | |
168 | if (me->devnum == num) | |
169 | break; | |
170 | if (!me) { | |
171 | /* doesn't exist if mdstat. | |
172 | * make sure it is new to /dev too | |
b5e64645 | 173 | */ |
8d80900b NB |
174 | char *dn; |
175 | if (autof > 0) | |
176 | minor = (-1-num) << MdpMinorShift; | |
177 | else | |
178 | minor = num; | |
16c6fa80 | 179 | dn = map_dev(major,minor, 0); |
8d80900b NB |
180 | if (dn==NULL || is_standard(dn, NULL)) { |
181 | /* this number only used by a 'standard' name, | |
182 | * so it is safe to use | |
183 | */ | |
184 | break; | |
185 | } | |
b5e64645 NB |
186 | } |
187 | } | |
188 | } | |
8d80900b NB |
189 | /* major and minor have been chosen */ |
190 | ||
191 | /* If it was a 'standard' name and it is in-use, then | |
192 | * the device could already be correct | |
193 | */ | |
0df46c2a NB |
194 | if (stb.st_mode && major(stb.st_rdev) == major && |
195 | minor(stb.st_rdev) == minor) | |
8d80900b NB |
196 | ; |
197 | else { | |
0df46c2a NB |
198 | if (major(makedev(major,minor)) != major || |
199 | minor(makedev(major,minor)) != minor) { | |
200 | fprintf(stderr, Name ": Need newer C library to use more than 4 partitionable md devices, sorry\n"); | |
201 | return -1; | |
202 | } | |
8d80900b NB |
203 | if (must_remove) |
204 | unlink(dev); | |
205 | ||
0df46c2a | 206 | if (mknod(dev, S_IFBLK|0600, makedev(major, minor))!= 0) { |
8d80900b | 207 | fprintf(stderr, Name ": failed to create %s\n", dev); |
b5e64645 NB |
208 | return -1; |
209 | } | |
8d80900b | 210 | if (must_remove) { |
1e0d770c NB |
211 | if (chown(dev, stb.st_uid, stb.st_gid)) |
212 | perror("chown"); | |
213 | if (chmod(dev, stb.st_mode & 07777)) | |
214 | perror("chmod"); | |
8d80900b | 215 | } |
173fc515 NB |
216 | stat(dev, &stb); |
217 | add_dev(dev, &stb, 0, NULL); | |
8d80900b | 218 | make_parts(dev,autof); |
b5e64645 | 219 | } |
b5e64645 NB |
220 | } |
221 | mdfd = open(dev, O_RDWR, 0); | |
222 | if (mdfd < 0) | |
223 | fprintf(stderr, Name ": error opening %s: %s\n", | |
224 | dev, strerror(errno)); | |
225 | else if (md_get_version(mdfd) <= 0) { | |
226 | fprintf(stderr, Name ": %s does not appear to be an md device\n", | |
227 | dev); | |
228 | close(mdfd); | |
229 | mdfd = -1; | |
230 | } | |
231 | return mdfd; | |
232 | } | |
233 |