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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 | } | |
0df46c2a | 67 | mknod(name, S_IFBLK | 0600, makedev(major, minor+i)); |
b5e64645 NB |
68 | chown(name, stb2.st_uid, stb2.st_gid); |
69 | chmod(name, stb2.st_mode & 07777); | |
173fc515 NB |
70 | stat(name, &stb2); |
71 | add_dev(name, &stb2, 0, NULL); | |
b5e64645 NB |
72 | } |
73 | } | |
74 | ||
75 | /* | |
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. | |
8d80900b | 81 | * If it now doesn't exist, we find a new md array and create the device. |
b5e64645 NB |
82 | * Default ownership is user=0, group=0 perm=0600 |
83 | */ | |
84 | int open_mddev(char *dev, int autof) | |
85 | { | |
86 | int mdfd; | |
87 | struct stat stb; | |
88 | int major = MD_MAJOR; | |
a0ef61bf | 89 | int minor = 0; |
b5e64645 NB |
90 | int must_remove = 0; |
91 | struct mdstat_ent *mdlist; | |
92 | int num; | |
93 | ||
94 | if (autof) { | |
95 | /* autof is set, so we need to check that the name is ok, | |
96 | * and possibly create one if not | |
97 | */ | |
48f7b27a NB |
98 | if (autof == -2 && !is_standard(dev, NULL)) { |
99 | fprintf(stderr, Name ": --auto=yes requires a 'standard' md device name, not %s\n", dev); | |
100 | return -1; | |
101 | } | |
b5e64645 | 102 | stb.st_mode = 0; |
0bbc98b5 | 103 | if (stat(dev, &stb)==0 && ! S_ISBLK(stb.st_mode)) { |
b5e64645 NB |
104 | fprintf(stderr, Name ": %s is not a block device.\n", |
105 | dev); | |
106 | return -1; | |
107 | } | |
108 | /* check major number is correct */ | |
109 | if (autof>0) | |
110 | major = get_mdp_major(); | |
0df46c2a | 111 | if (stb.st_mode && major(stb.st_rdev) != major) |
b5e64645 NB |
112 | must_remove = 1; |
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); | |
117 | if (mdfd < 0) { | |
118 | fprintf(stderr, Name ": error opening %s: %s\n", | |
119 | dev, strerror(errno)); | |
120 | return -1; | |
121 | } else if (md_get_version(mdfd) <= 0) { | |
122 | fprintf(stderr, Name ": %s does not appear to be an md device\n", | |
123 | dev); | |
124 | close(mdfd); | |
125 | return -1; | |
126 | } | |
127 | if (ioctl(mdfd, GET_ARRAY_INFO, &array)==0) { | |
128 | /* already active */ | |
129 | must_remove = 1; | |
130 | close(mdfd); | |
131 | } else { | |
132 | if (autof > 0) | |
133 | make_parts(dev, autof); | |
134 | return mdfd; | |
135 | } | |
136 | } | |
137 | /* Ok, need to find a minor that is not in use. | |
8d80900b NB |
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 | |
b5e64645 NB |
141 | * an unused number |
142 | */ | |
8d80900b NB |
143 | switch(is_standard(dev, &num)) { |
144 | case -1: /* non partitioned */ | |
145 | if (autof > 0) { | |
146 | fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev); | |
147 | return -1; | |
148 | } | |
149 | minor = num; | |
150 | num = -1-num; | |
151 | break; | |
152 | case 1: /* partitioned */ | |
153 | if (autof == -1) { | |
154 | fprintf(stderr, Name ": that --auto option not compatable with device named %s\n", dev); | |
155 | return -1; | |
156 | } | |
157 | minor = num << MdpMinorShift; | |
158 | major = get_mdp_major(); | |
159 | break; | |
160 | case 0: /* not standard, pick an unused number */ | |
22a88995 | 161 | mdlist = mdstat_read(0, 0); |
8d80900b NB |
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) | |
166 | break; | |
167 | if (!me) { | |
168 | /* doesn't exist if mdstat. | |
169 | * make sure it is new to /dev too | |
b5e64645 | 170 | */ |
8d80900b NB |
171 | char *dn; |
172 | if (autof > 0) | |
173 | minor = (-1-num) << MdpMinorShift; | |
174 | else | |
175 | minor = num; | |
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 | |
180 | */ | |
181 | break; | |
182 | } | |
b5e64645 NB |
183 | } |
184 | } | |
185 | } | |
8d80900b NB |
186 | /* major and minor have been chosen */ |
187 | ||
188 | /* If it was a 'standard' name and it is in-use, then | |
189 | * the device could already be correct | |
190 | */ | |
0df46c2a NB |
191 | if (stb.st_mode && major(stb.st_rdev) == major && |
192 | minor(stb.st_rdev) == minor) | |
8d80900b NB |
193 | ; |
194 | else { | |
0df46c2a NB |
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"); | |
198 | return -1; | |
199 | } | |
8d80900b NB |
200 | if (must_remove) |
201 | unlink(dev); | |
202 | ||
0df46c2a | 203 | if (mknod(dev, S_IFBLK|0600, makedev(major, minor))!= 0) { |
8d80900b | 204 | fprintf(stderr, Name ": failed to create %s\n", dev); |
b5e64645 NB |
205 | return -1; |
206 | } | |
8d80900b NB |
207 | if (must_remove) { |
208 | chown(dev, stb.st_uid, stb.st_gid); | |
209 | chmod(dev, stb.st_mode & 07777); | |
210 | } | |
173fc515 NB |
211 | stat(dev, &stb); |
212 | add_dev(dev, &stb, 0, NULL); | |
8d80900b | 213 | make_parts(dev,autof); |
b5e64645 | 214 | } |
b5e64645 NB |
215 | } |
216 | mdfd = open(dev, O_RDWR, 0); | |
217 | if (mdfd < 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", | |
222 | dev); | |
223 | close(mdfd); | |
224 | mdfd = -1; | |
225 | } | |
226 | return mdfd; | |
227 | } | |
228 |