]>
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 | |
38 | * If dev ends with a digit, we add "_p%d" else "%d" | |
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; | |
45 | char *name = malloc(strlen(dev) + 20); | |
46 | int dig = isdigit(dev[strlen(dev)-1]); | |
47 | ||
48 | if (stat(dev, &stb)!= 0) | |
49 | return; | |
50 | if (!S_ISBLK(stb.st_mode)) | |
51 | return; | |
52 | major = MAJOR(stb.st_rdev); | |
53 | minor = MINOR(stb.st_rdev); | |
54 | for (i=1; i <= cnt ; i++) { | |
55 | struct stat stb2; | |
56 | sprintf(name, "%s%s%d", dev, dig?"_p":"", i); | |
57 | if (stat(name, &stb2)==0) { | |
58 | if (!S_ISBLK(stb2.st_mode)) | |
59 | continue; | |
60 | if (stb2.st_rdev == MKDEV(major, minor+i)) | |
61 | continue; | |
62 | unlink(name); | |
63 | } else { | |
64 | stb2 = stb; | |
65 | } | |
66 | mknod(name, S_IFBLK | 0600, MKDEV(major, minor+i)); | |
67 | chown(name, stb2.st_uid, stb2.st_gid); | |
68 | chmod(name, stb2.st_mode & 07777); | |
69 | } | |
70 | } | |
71 | ||
72 | /* | |
73 | * Open a given md device, and check that it really is one. | |
74 | * If 'autof' is given, then we need to create, or recreate, the md device. | |
75 | * If the name already exists, and is not a block device, we fail. | |
76 | * If it exists and is not an md device, is not the right type (partitioned or not), | |
77 | * or is currently in-use, we remove the device, but remember the owner and mode. | |
78 | * If it now doesn't exist, we find a few md array and create the device. | |
79 | * Default ownership is user=0, group=0 perm=0600 | |
80 | */ | |
81 | int open_mddev(char *dev, int autof) | |
82 | { | |
83 | int mdfd; | |
84 | struct stat stb; | |
85 | int major = MD_MAJOR; | |
86 | int minor; | |
87 | int must_remove = 0; | |
88 | struct mdstat_ent *mdlist; | |
89 | int num; | |
90 | ||
91 | if (autof) { | |
92 | /* autof is set, so we need to check that the name is ok, | |
93 | * and possibly create one if not | |
94 | */ | |
95 | stb.st_mode = 0; | |
96 | if (lstat(dev, &stb)==0 && ! S_ISBLK(stb.st_mode)) { | |
97 | fprintf(stderr, Name ": %s is not a block device.\n", | |
98 | dev); | |
99 | return -1; | |
100 | } | |
101 | /* check major number is correct */ | |
102 | if (autof>0) | |
103 | major = get_mdp_major(); | |
104 | if (stb.st_mode && MAJOR(stb.st_rdev) != major) | |
105 | must_remove = 1; | |
106 | if (stb.st_mode && !must_remove) { | |
107 | mdu_array_info_t array; | |
108 | /* looks ok, see if it is available */ | |
109 | mdfd = open(dev, O_RDWR, 0); | |
110 | if (mdfd < 0) { | |
111 | fprintf(stderr, Name ": error opening %s: %s\n", | |
112 | dev, strerror(errno)); | |
113 | return -1; | |
114 | } else if (md_get_version(mdfd) <= 0) { | |
115 | fprintf(stderr, Name ": %s does not appear to be an md device\n", | |
116 | dev); | |
117 | close(mdfd); | |
118 | return -1; | |
119 | } | |
120 | if (ioctl(mdfd, GET_ARRAY_INFO, &array)==0) { | |
121 | /* already active */ | |
122 | must_remove = 1; | |
123 | close(mdfd); | |
124 | } else { | |
125 | if (autof > 0) | |
126 | make_parts(dev, autof); | |
127 | return mdfd; | |
128 | } | |
129 | } | |
130 | /* Ok, need to find a minor that is not in use. | |
131 | * Easiest to read /proc/mdstat, and hunt through for | |
132 | * an unused number | |
133 | */ | |
134 | mdlist = mdstat_read(0); | |
135 | for (num= (autof>0)?-1:0 ; ; num+= (autof>2)?-1:1) { | |
136 | struct mdstat_ent *me; | |
137 | for (me=mdlist; me; me=me->next) | |
138 | if (me->devnum == num) | |
139 | break; | |
140 | if (!me) { | |
141 | /* doesn't exist if mdstat. | |
142 | * make sure it is new to /dev too | |
143 | */ | |
144 | char *dn; | |
145 | if (autof > 0) | |
146 | minor = (-1-num) << MdpMinorShift; | |
147 | else | |
148 | minor = num; | |
149 | dn = map_dev(major,minor); | |
150 | if (dn==NULL || is_standard(dn)) { | |
151 | /* this number only used by a 'standard' name, | |
152 | * so it is safe to use | |
153 | */ | |
154 | break; | |
155 | } | |
156 | } | |
157 | } | |
158 | /* 'num' is the number to use, >=0 for md, <0 for mdp */ | |
159 | if (must_remove) { | |
160 | /* never remove a device name that ends /mdNN or /dNN, | |
161 | * that would be confusing | |
162 | */ | |
163 | if (is_standard(dev)) { | |
164 | fprintf(stderr, Name ": --auto refusing to remove %s as it looks like a standard name.\n", | |
165 | dev); | |
166 | return -1; | |
167 | } | |
168 | unlink(dev); | |
169 | } | |
170 | ||
171 | if (mknod(dev, S_IFBLK|0600, MKDEV(major, minor))!= 0) { | |
172 | fprintf(stderr, Name ": failed to create %s\n", dev); | |
173 | return -1; | |
174 | } | |
175 | if (must_remove) { | |
176 | chown(dev, stb.st_uid, stb.st_gid); | |
177 | chmod(dev, stb.st_mode & 07777); | |
178 | } | |
179 | make_parts(dev,autof); | |
180 | } | |
181 | mdfd = open(dev, O_RDWR, 0); | |
182 | if (mdfd < 0) | |
183 | fprintf(stderr, Name ": error opening %s: %s\n", | |
184 | dev, strerror(errno)); | |
185 | else if (md_get_version(mdfd) <= 0) { | |
186 | fprintf(stderr, Name ": %s does not appear to be an md device\n", | |
187 | dev); | |
188 | close(mdfd); | |
189 | mdfd = -1; | |
190 | } | |
191 | return mdfd; | |
192 | } | |
193 |