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Commit | Line | Data |
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8382f19b NB |
1 | /* |
2 | * mapfile - manage /var/run/mdadm.map. Part of: | |
3 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
4 | * | |
5 | * Copyright (C) 2006 Neil Brown <neilb@suse.de> | |
6 | * | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | * Author: Neil Brown | |
23 | * Email: <neilb@suse.de> | |
24 | * Paper: Neil Brown | |
25 | * Novell Inc | |
26 | * GPO Box Q1283 | |
27 | * QVB Post Office, NSW 1230 | |
28 | * Australia | |
29 | */ | |
30 | ||
31 | /* /var/run/mdadm.map is used to track arrays being created in --incremental | |
32 | * more. It particularly allows lookup from UUID to array device, but | |
33 | * also allows the array device name to be easily found. | |
34 | * | |
35 | * The map file is line based with space separated fields. The fields are: | |
1522c538 NB |
36 | * Device id - mdX or mdpX where X is a number. |
37 | * metadata - 0.90 1.0 1.1 1.2 ddf ... | |
8382f19b NB |
38 | * UUID - uuid of the array |
39 | * path - path where device created: /dev/md/home | |
40 | * | |
41 | */ | |
42 | ||
43 | ||
44 | #include "mdadm.h" | |
45 | ||
46 | ||
47 | int map_write(struct map_ent *mel) | |
48 | { | |
49 | FILE *f; | |
50 | int err; | |
51 | int subdir = 1; | |
52 | ||
53 | f = fopen("/var/run/mdadm/map.new", "w"); | |
54 | if (!f) { | |
55 | f = fopen("/var/run/mdadm.map.new", "w"); | |
35e3446b | 56 | subdir = 0; |
8382f19b NB |
57 | } |
58 | if (!f) | |
59 | return 0; | |
60 | while (mel) { | |
61 | if (mel->devnum < 0) | |
62 | fprintf(f, "mdp%d ", -1-mel->devnum); | |
63 | else | |
64 | fprintf(f, "md%d ", mel->devnum); | |
1522c538 | 65 | fprintf(f, "%s ", mel->metadata); |
8382f19b NB |
66 | fprintf(f, "%08x:%08x:%08x:%08x ", mel->uuid[0], |
67 | mel->uuid[1], mel->uuid[2], mel->uuid[3]); | |
68 | fprintf(f, "%s\n", mel->path); | |
69 | mel = mel->next; | |
70 | } | |
71 | fflush(f); | |
72 | err = ferror(f); | |
73 | fclose(f); | |
74 | if (err) { | |
75 | if (subdir) | |
76 | unlink("/var/run/mdadm/map.new"); | |
77 | else | |
78 | unlink("/var/run/mdadm.map.new"); | |
79 | return 0; | |
80 | } | |
81 | if (subdir) | |
82 | return rename("/var/run/mdadm/map.new", | |
83 | "/var/run/mdadm/map") == 0; | |
84 | else | |
85 | return rename("/var/run/mdadm.map.new", | |
86 | "/var/run/mdadm.map") == 0; | |
87 | } | |
88 | ||
ad5bc697 N |
89 | |
90 | static int lfd = -1; | |
91 | static int lsubdir = 0; | |
92 | int map_lock(struct map_ent **melp) | |
93 | { | |
94 | if (lfd < 0) { | |
95 | lfd = open("/var/run/mdadm/map.lock", O_CREAT|O_RDWR, 0600); | |
96 | if (lfd < 0) { | |
97 | lfd = open("/var/run/mdadm.map.lock", O_CREAT|O_RDWR, 0600); | |
98 | lsubdir = 0; | |
99 | } else | |
100 | lsubdir = 1; | |
101 | if (lfd < 0) | |
102 | return -1; | |
103 | if (lockf(lfd, F_LOCK, 0) != 0) { | |
104 | close(lfd); | |
105 | lfd = -1; | |
106 | return -1; | |
107 | } | |
108 | } | |
109 | if (*melp) | |
110 | map_free(*melp); | |
111 | map_read(melp); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | void map_unlock(struct map_ent **melp) | |
116 | { | |
117 | if (lfd >= 0) | |
118 | close(lfd); | |
119 | if (lsubdir) | |
120 | unlink("/var/run/mdadm/map.lock"); | |
121 | else | |
122 | unlink("/var/run/mdadm.map.lock"); | |
123 | lfd = -1; | |
124 | } | |
125 | ||
8382f19b | 126 | void map_add(struct map_ent **melp, |
1522c538 | 127 | int devnum, char *metadata, int uuid[4], char *path) |
8382f19b NB |
128 | { |
129 | struct map_ent *me = malloc(sizeof(*me)); | |
130 | ||
131 | me->devnum = devnum; | |
1522c538 | 132 | strcpy(me->metadata, metadata); |
8382f19b NB |
133 | memcpy(me->uuid, uuid, 16); |
134 | me->path = strdup(path); | |
135 | me->next = *melp; | |
136 | *melp = me; | |
137 | } | |
138 | ||
139 | void map_read(struct map_ent **melp) | |
140 | { | |
141 | FILE *f; | |
142 | char buf[8192]; | |
143 | char path[200]; | |
1522c538 NB |
144 | int devnum, uuid[4]; |
145 | char metadata[30]; | |
8382f19b NB |
146 | char nam[4]; |
147 | ||
148 | *melp = NULL; | |
149 | ||
150 | f = fopen("/var/run/mdadm/map", "r"); | |
151 | if (!f) | |
152 | f = fopen("/var/run/mdadm.map", "r"); | |
153 | if (!f) | |
154 | return; | |
155 | ||
156 | while (fgets(buf, sizeof(buf), f)) { | |
c5afc314 | 157 | if (sscanf(buf, " %3[mdp]%d %s %x:%x:%x:%x %200s", |
1522c538 | 158 | nam, &devnum, metadata, uuid, uuid+1, |
c5afc314 N |
159 | uuid+2, uuid+3, path) == 8) { |
160 | if (strncmp(nam, "md", 2) != 0) | |
161 | continue; | |
162 | if (nam[2] == 'p') | |
8382f19b | 163 | devnum = -1 - devnum; |
1522c538 | 164 | map_add(melp, devnum, metadata, uuid, path); |
8382f19b NB |
165 | } |
166 | } | |
167 | fclose(f); | |
168 | } | |
169 | ||
170 | void map_free(struct map_ent *map) | |
171 | { | |
172 | while (map) { | |
173 | struct map_ent *mp = map; | |
174 | map = mp->next; | |
175 | free(mp->path); | |
176 | free(mp); | |
177 | } | |
178 | } | |
179 | ||
1522c538 | 180 | int map_update(struct map_ent **mpp, int devnum, char *metadata, |
8382f19b NB |
181 | int *uuid, char *path) |
182 | { | |
183 | struct map_ent *map, *mp; | |
184 | int rv; | |
185 | ||
186 | if (mpp && *mpp) | |
187 | map = *mpp; | |
188 | else | |
189 | map_read(&map); | |
190 | ||
191 | for (mp = map ; mp ; mp=mp->next) | |
192 | if (mp->devnum == devnum) { | |
1522c538 | 193 | strcpy(mp->metadata, metadata); |
8382f19b NB |
194 | memcpy(mp->uuid, uuid, 16); |
195 | free(mp->path); | |
196 | mp->path = strdup(path); | |
197 | break; | |
198 | } | |
199 | if (!mp) | |
1522c538 | 200 | map_add(&map, devnum, metadata, uuid, path); |
a04d5763 N |
201 | if (mpp) |
202 | *mpp = NULL; | |
8382f19b NB |
203 | rv = map_write(map); |
204 | map_free(map); | |
205 | return rv; | |
206 | } | |
207 | ||
208 | void map_delete(struct map_ent **mapp, int devnum) | |
209 | { | |
210 | struct map_ent *mp; | |
211 | ||
212 | if (*mapp == NULL) | |
213 | map_read(mapp); | |
214 | ||
215 | for (mp = *mapp; mp; mp = *mapp) { | |
216 | if (mp->devnum == devnum) { | |
217 | *mapp = mp->next; | |
218 | free(mp->path); | |
219 | free(mp); | |
220 | } else | |
221 | mapp = & mp->next; | |
222 | } | |
223 | } | |
224 | ||
225 | struct map_ent *map_by_uuid(struct map_ent **map, int uuid[4]) | |
226 | { | |
227 | struct map_ent *mp; | |
228 | if (!*map) | |
229 | map_read(map); | |
230 | ||
231 | for (mp = *map ; mp ; mp = mp->next) | |
232 | if (memcmp(uuid, mp->uuid, 16) == 0) | |
233 | return mp; | |
234 | return NULL; | |
4ccad7b1 | 235 | } |
8382f19b | 236 | |
4ccad7b1 N |
237 | struct map_ent *map_by_devnum(struct map_ent **map, int devnum) |
238 | { | |
239 | struct map_ent *mp; | |
240 | if (!*map) | |
241 | map_read(map); | |
242 | ||
243 | for (mp = *map ; mp ; mp = mp->next) | |
244 | if (mp->devnum == devnum) | |
245 | return mp; | |
246 | return NULL; | |
8382f19b | 247 | } |