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Commit | Line | Data |
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e86c9dd6 NB |
1 | /* |
2 | * sysfs - extract md related information from sysfs. 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 | */ | |
25 | ||
26 | #include "mdadm.h" | |
27 | #include <dirent.h> | |
28 | ||
29 | int load_sys(char *path, char *buf) | |
30 | { | |
31 | int fd = open(path, O_RDONLY); | |
32 | int n; | |
33 | if (fd < 0) | |
34 | return -1; | |
35 | n = read(fd, buf, 1024); | |
36 | close(fd); | |
37 | if (n <=0 || n >= 1024) | |
38 | return -1; | |
39 | buf[n] = 0; | |
40 | if (buf[n-1] == '\n') | |
41 | buf[n-1] = 0; | |
42 | return 0; | |
43 | } | |
44 | ||
8382f19b NB |
45 | void sysfs_free(struct sysarray *sra) |
46 | { | |
47 | if (!sra) | |
48 | return; | |
49 | while (sra->devs) { | |
50 | struct sysdev *d = sra->devs; | |
51 | sra->devs = d->next; | |
52 | free(d); | |
53 | } | |
54 | free(sra); | |
55 | } | |
56 | ||
e86c9dd6 NB |
57 | struct sysarray *sysfs_read(int fd, int devnum, unsigned long options) |
58 | { | |
59 | /* Longest possible name in sysfs, mounted at /sys, is | |
60 | * /sys/block/md_dXXX/md/dev-XXXXX/block/dev | |
61 | * /sys/block/md_dXXX/md/metadata_version | |
62 | * which is about 41 characters. 50 should do for now | |
63 | */ | |
64 | char fname[50]; | |
65 | char buf[1024]; | |
66 | char *base; | |
67 | char *dbase; | |
68 | struct sysarray *sra; | |
69 | struct sysdev *dev; | |
70 | DIR *dir; | |
71 | struct dirent *de; | |
72 | ||
73 | sra = malloc(sizeof(*sra)); | |
74 | if (sra == NULL) | |
75 | return sra; | |
76 | ||
77 | if (fd >= 0) { | |
78 | struct stat stb; | |
79 | if (fstat(fd, &stb)) return NULL; | |
80 | if (major(stb.st_rdev)==9) | |
81 | sprintf(sra->name, "md%d", minor(stb.st_rdev)); | |
82 | else | |
83 | sprintf(sra->name, "md_d%d", | |
7fa42a0b | 84 | minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
85 | } else { |
86 | if (devnum >= 0) | |
87 | sprintf(sra->name, "md%d", devnum); | |
88 | else | |
89 | sprintf(sra->name, "md_d%d", | |
90 | -1-devnum); | |
91 | } | |
92 | sprintf(fname, "/sys/block/%s/md/", sra->name); | |
93 | base = fname + strlen(fname); | |
94 | ||
95 | sra->devs = NULL; | |
8382f19b NB |
96 | if (options & GET_VERSION) { |
97 | strcpy(base, "metadata_version"); | |
98 | if (load_sys(fname, buf)) | |
99 | goto abort; | |
100 | if (strncmp(buf, "none", 4) == 0) | |
101 | sra->major_version = sra->minor_version = -1; | |
102 | else | |
103 | sscanf(buf, "%d.%d", | |
104 | &sra->major_version, &sra->minor_version); | |
105 | } | |
e86c9dd6 NB |
106 | if (options & GET_LEVEL) { |
107 | strcpy(base, "level"); | |
108 | if (load_sys(fname, buf)) | |
109 | goto abort; | |
110 | sra->level = map_name(pers, buf); | |
111 | } | |
112 | if (options & GET_LAYOUT) { | |
113 | strcpy(base, "layout"); | |
114 | if (load_sys(fname, buf)) | |
115 | goto abort; | |
116 | sra->layout = strtoul(buf, NULL, 0); | |
117 | } | |
118 | if (options & GET_COMPONENT) { | |
119 | strcpy(base, "component_size"); | |
120 | if (load_sys(fname, buf)) | |
121 | goto abort; | |
122 | sra->component_size = strtoull(buf, NULL, 0); | |
353632d9 NB |
123 | /* sysfs reports "K", but we want sectors */ |
124 | sra->component_size *= 2; | |
e86c9dd6 NB |
125 | } |
126 | if (options & GET_CHUNK) { | |
127 | strcpy(base, "chunk_size"); | |
128 | if (load_sys(fname, buf)) | |
129 | goto abort; | |
130 | sra->chunk = strtoul(buf, NULL, 0); | |
131 | } | |
758d3a8e NB |
132 | if (options & GET_CACHE) { |
133 | strcpy(base, "stripe_cache_size"); | |
134 | if (load_sys(fname, buf)) | |
135 | goto abort; | |
136 | sra->cache_size = strtoul(buf, NULL, 0); | |
137 | } | |
37dfc3d6 NB |
138 | if (options & GET_MISMATCH) { |
139 | strcpy(base, "mismatch_cnt"); | |
140 | if (load_sys(fname, buf)) | |
141 | goto abort; | |
142 | sra->mismatch_cnt = strtoul(buf, NULL, 0); | |
143 | } | |
e86c9dd6 NB |
144 | |
145 | if (! (options & GET_DEVS)) | |
146 | return sra; | |
147 | ||
148 | /* Get all the devices as well */ | |
149 | *base = 0; | |
150 | dir = opendir(fname); | |
151 | if (!dir) | |
152 | goto abort; | |
153 | sra->spares = 0; | |
154 | ||
155 | while ((de = readdir(dir)) != NULL) { | |
156 | char *ep; | |
157 | if (de->d_ino == 0 || | |
158 | strncmp(de->d_name, "dev-", 4) != 0) | |
159 | continue; | |
160 | strcpy(base, de->d_name); | |
161 | dbase = base + strlen(base); | |
162 | *dbase++ = '/'; | |
163 | ||
164 | dev = malloc(sizeof(*dev)); | |
165 | if (!dev) | |
166 | goto abort; | |
167 | dev->next = sra->devs; | |
168 | sra->devs = dev; | |
8382f19b | 169 | strcpy(dev->name, de->d_name); |
e86c9dd6 NB |
170 | |
171 | /* Always get slot, major, minor */ | |
172 | strcpy(dbase, "slot"); | |
173 | if (load_sys(fname, buf)) | |
174 | goto abort; | |
175 | dev->role = strtoul(buf, &ep, 10); | |
176 | if (*ep) dev->role = -1; | |
177 | ||
178 | strcpy(dbase, "block/dev"); | |
179 | if (load_sys(fname, buf)) | |
180 | goto abort; | |
181 | sscanf(buf, "%d:%d", &dev->major, &dev->minor); | |
182 | ||
183 | if (options & GET_OFFSET) { | |
184 | strcpy(dbase, "offset"); | |
185 | if (load_sys(fname, buf)) | |
186 | goto abort; | |
187 | dev->offset = strtoull(buf, NULL, 0); | |
188 | } | |
189 | if (options & GET_SIZE) { | |
190 | strcpy(dbase, "size"); | |
191 | if (load_sys(fname, buf)) | |
192 | goto abort; | |
193 | dev->size = strtoull(buf, NULL, 0); | |
194 | } | |
195 | if (options & GET_STATE) { | |
196 | dev->state = 0; | |
197 | strcpy(dbase, "state"); | |
198 | if (load_sys(fname, buf)) | |
199 | goto abort; | |
200 | if (strstr(buf, "in_sync")) | |
201 | dev->state |= (1<<MD_DISK_SYNC); | |
202 | if (strstr(buf, "faulty")) | |
203 | dev->state |= (1<<MD_DISK_FAULTY); | |
204 | if (dev->state == 0) | |
205 | sra->spares++; | |
206 | } | |
207 | if (options & GET_ERROR) { | |
208 | strcpy(buf, "errors"); | |
209 | if (load_sys(fname, buf)) | |
210 | goto abort; | |
211 | dev->errors = strtoul(buf, NULL, 0); | |
212 | } | |
213 | } | |
214 | return sra; | |
215 | ||
216 | abort: | |
8382f19b | 217 | sysfs_free(sra); |
e86c9dd6 NB |
218 | return NULL; |
219 | } | |
220 | ||
221 | unsigned long long get_component_size(int fd) | |
222 | { | |
223 | /* Find out the component size of the array. | |
224 | * We cannot trust GET_ARRAY_INFO ioctl as it's | |
225 | * size field is only 32bits. | |
226 | * So look in /sys/block/mdXXX/md/component_size | |
353632d9 | 227 | * |
8686f3ed | 228 | * This returns in units of sectors. |
e86c9dd6 NB |
229 | */ |
230 | struct stat stb; | |
231 | char fname[50]; | |
232 | int n; | |
233 | if (fstat(fd, &stb)) return 0; | |
234 | if (major(stb.st_rdev) == 9) | |
235 | sprintf(fname, "/sys/block/md%d/md/component_size", | |
236 | minor(stb.st_rdev)); | |
237 | else | |
238 | sprintf(fname, "/sys/block/md_d%d/md/component_size", | |
7fa42a0b | 239 | minor(stb.st_rdev)>>MdpMinorShift); |
e86c9dd6 NB |
240 | fd = open(fname, O_RDONLY); |
241 | if (fd < 0) | |
242 | return 0; | |
243 | n = read(fd, fname, sizeof(fname)); | |
244 | close(fd); | |
245 | if (n == sizeof(fname)) | |
246 | return 0; | |
247 | fname[n] = 0; | |
8686f3ed | 248 | return strtoull(fname, NULL, 10) * 2; |
e86c9dd6 NB |
249 | } |
250 | ||
251 | int sysfs_set_str(struct sysarray *sra, struct sysdev *dev, | |
252 | char *name, char *val) | |
253 | { | |
254 | char fname[50]; | |
255 | int n; | |
256 | int fd; | |
257 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
258 | sra->name, dev?dev->name:"", name); | |
259 | fd = open(fname, O_WRONLY); | |
260 | if (fd < 0) | |
261 | return -1; | |
262 | n = write(fd, val, strlen(val)); | |
263 | close(fd); | |
264 | if (n != strlen(val)) | |
265 | return -1; | |
266 | return 0; | |
267 | } | |
268 | ||
269 | int sysfs_set_num(struct sysarray *sra, struct sysdev *dev, | |
270 | char *name, unsigned long long val) | |
271 | { | |
272 | char valstr[50]; | |
273 | sprintf(valstr, "%llu", val); | |
274 | return sysfs_set_str(sra, dev, name, valstr); | |
275 | } | |
276 | ||
277 | int sysfs_get_ll(struct sysarray *sra, struct sysdev *dev, | |
278 | char *name, unsigned long long *val) | |
279 | { | |
280 | char fname[50]; | |
281 | char buf[50]; | |
282 | int n; | |
283 | int fd; | |
284 | char *ep; | |
285 | sprintf(fname, "/sys/block/%s/md/%s/%s", | |
286 | sra->name, dev?dev->name:"", name); | |
287 | fd = open(fname, O_RDONLY); | |
288 | if (fd < 0) | |
289 | return -1; | |
290 | n = read(fd, buf, sizeof(buf)); | |
291 | close(fd); | |
292 | if (n <= 0) | |
293 | return -1; | |
294 | buf[n] = 0; | |
295 | *val = strtoull(buf, &ep, 0); | |
296 | if (ep == buf || (*ep != 0 && *ep != '\n' && *ep != ' ')) | |
297 | return -1; | |
298 | return 0; | |
299 | } |