]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - sysfs.c
2 * sysfs - extract md related information from sysfs. Part of:
3 * mdadm - manage Linux "md" devices aka RAID arrays.
5 * Copyright (C) 2006 Neil Brown <neilb@suse.de>
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.
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.
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
23 * Email: <neilb@suse.de>
29 int load_sys(char *path
, char *buf
)
31 int fd
= open(path
, O_RDONLY
);
35 n
= read(fd
, buf
, 1024);
37 if (n
<0 || n
>= 1024)
45 void sysfs_free(struct mdinfo
*sra
)
48 struct mdinfo
*sra2
= sra
->next
;
50 struct mdinfo
*d
= sra
->devs
;
59 struct mdinfo
*sysfs_read(int fd
, int devnum
, unsigned long options
)
61 /* Longest possible name in sysfs, mounted at /sys, is
62 * /sys/block/md_dXXX/md/dev-XXXXX/block/dev
63 * /sys/block/md_dXXX/md/metadata_version
64 * which is about 41 characters. 50 should do for now
75 sra
= malloc(sizeof(*sra
));
83 if (fstat(fd
, &stb
)) return NULL
;
84 if (ioctl(fd
, RAID_VERSION
, &vers
) != 0)
86 if (major(stb
.st_rdev
)==9)
87 sprintf(sra
->sys_name
, "md%d", (int)minor(stb
.st_rdev
));
89 sprintf(sra
->sys_name
, "md_d%d",
90 (int)minor(stb
.st_rdev
)>>MdpMinorShift
);
93 sprintf(sra
->sys_name
, "md%d", devnum
);
95 sprintf(sra
->sys_name
, "md_d%d",
98 sprintf(fname
, "/sys/block/%s/md/", sra
->sys_name
);
99 base
= fname
+ strlen(fname
);
102 if (options
& GET_VERSION
) {
103 strcpy(base
, "metadata_version");
104 if (load_sys(fname
, buf
))
106 if (strncmp(buf
, "none", 4) == 0) {
107 sra
->array
.major_version
=
108 sra
->array
.minor_version
= -1;
109 strcpy(sra
->text_version
, "");
110 } else if (strncmp(buf
, "external:", 9) == 0) {
111 sra
->array
.major_version
= -1;
112 sra
->array
.minor_version
= -2;
113 strcpy(sra
->text_version
, buf
+9);
116 &sra
->array
.major_version
,
117 &sra
->array
.minor_version
);
119 if (options
& GET_LEVEL
) {
120 strcpy(base
, "level");
121 if (load_sys(fname
, buf
))
123 sra
->array
.level
= map_name(pers
, buf
);
125 if (options
& GET_LAYOUT
) {
126 strcpy(base
, "layout");
127 if (load_sys(fname
, buf
))
129 sra
->array
.layout
= strtoul(buf
, NULL
, 0);
131 if (options
& GET_COMPONENT
) {
132 strcpy(base
, "component_size");
133 if (load_sys(fname
, buf
))
135 sra
->component_size
= strtoull(buf
, NULL
, 0);
136 /* sysfs reports "K", but we want sectors */
137 sra
->component_size
*= 2;
139 if (options
& GET_CHUNK
) {
140 strcpy(base
, "chunk_size");
141 if (load_sys(fname
, buf
))
143 sra
->array
.chunk_size
= strtoul(buf
, NULL
, 0);
145 if (options
& GET_CACHE
) {
146 strcpy(base
, "stripe_cache_size");
147 if (load_sys(fname
, buf
))
149 sra
->cache_size
= strtoul(buf
, NULL
, 0);
151 if (options
& GET_MISMATCH
) {
152 strcpy(base
, "mismatch_cnt");
153 if (load_sys(fname
, buf
))
155 sra
->mismatch_cnt
= strtoul(buf
, NULL
, 0);
158 if (! (options
& GET_DEVS
))
161 /* Get all the devices as well */
163 dir
= opendir(fname
);
166 sra
->array
.spare_disks
= 0;
168 while ((de
= readdir(dir
)) != NULL
) {
170 if (de
->d_ino
== 0 ||
171 strncmp(de
->d_name
, "dev-", 4) != 0)
173 strcpy(base
, de
->d_name
);
174 dbase
= base
+ strlen(base
);
177 dev
= malloc(sizeof(*dev
));
180 dev
->next
= sra
->devs
;
182 strcpy(dev
->sys_name
, de
->d_name
);
184 /* Always get slot, major, minor */
185 strcpy(dbase
, "slot");
186 if (load_sys(fname
, buf
))
188 dev
->disk
.raid_disk
= strtoul(buf
, &ep
, 10);
189 if (*ep
) dev
->disk
.raid_disk
= -1;
191 strcpy(dbase
, "block/dev");
192 if (load_sys(fname
, buf
))
194 sscanf(buf
, "%d:%d", &dev
->disk
.major
, &dev
->disk
.minor
);
196 if (options
& GET_OFFSET
) {
197 strcpy(dbase
, "offset");
198 if (load_sys(fname
, buf
))
200 dev
->data_offset
= strtoull(buf
, NULL
, 0);
202 if (options
& GET_SIZE
) {
203 strcpy(dbase
, "size");
204 if (load_sys(fname
, buf
))
206 dev
->component_size
= strtoull(buf
, NULL
, 0);
208 if (options
& GET_STATE
) {
210 strcpy(dbase
, "state");
211 if (load_sys(fname
, buf
))
213 if (strstr(buf
, "in_sync"))
214 dev
->disk
.state
|= (1<<MD_DISK_SYNC
);
215 if (strstr(buf
, "faulty"))
216 dev
->disk
.state
|= (1<<MD_DISK_FAULTY
);
217 if (dev
->disk
.state
== 0)
218 sra
->array
.spare_disks
++;
220 if (options
& GET_ERROR
) {
221 strcpy(buf
, "errors");
222 if (load_sys(fname
, buf
))
224 dev
->errors
= strtoul(buf
, NULL
, 0);
234 unsigned long long get_component_size(int fd
)
236 /* Find out the component size of the array.
237 * We cannot trust GET_ARRAY_INFO ioctl as it's
238 * size field is only 32bits.
239 * So look in /sys/block/mdXXX/md/component_size
241 * This returns in units of sectors.
246 if (fstat(fd
, &stb
)) return 0;
247 if (major(stb
.st_rdev
) == 9)
248 sprintf(fname
, "/sys/block/md%d/md/component_size",
249 (int)minor(stb
.st_rdev
));
251 sprintf(fname
, "/sys/block/md_d%d/md/component_size",
252 (int)minor(stb
.st_rdev
)>>MdpMinorShift
);
253 fd
= open(fname
, O_RDONLY
);
256 n
= read(fd
, fname
, sizeof(fname
));
258 if (n
== sizeof(fname
))
261 return strtoull(fname
, NULL
, 10) * 2;
264 int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
265 char *name
, char *val
)
270 sprintf(fname
, "/sys/block/%s/md/%s/%s",
271 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
272 fd
= open(fname
, O_WRONLY
);
275 n
= write(fd
, val
, strlen(val
));
277 if (n
!= strlen(val
))
282 int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
283 char *name
, unsigned long long val
)
286 sprintf(valstr
, "%llu", val
);
287 return sysfs_set_str(sra
, dev
, name
, valstr
);
290 int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
291 char *name
, unsigned long long *val
)
298 sprintf(fname
, "/sys/block/%s/md/%s/%s",
299 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
300 fd
= open(fname
, O_RDONLY
);
303 n
= read(fd
, buf
, sizeof(buf
));
308 *val
= strtoull(buf
, &ep
, 0);
309 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))
314 int sysfs_set_array(struct mdinfo
*sra
,
318 sra
->array
= info
->array
;
320 if (info
->array
.level
< 0)
321 return 0; /* FIXME */
322 rv
|= sysfs_set_str(sra
, NULL
, "level",
323 map_num(pers
, info
->array
.level
));
324 rv
|= sysfs_set_num(sra
, NULL
, "raid_disks", info
->array
.raid_disks
);
325 rv
|= sysfs_set_num(sra
, NULL
, "chunk_size", info
->array
.chunk_size
);
326 rv
|= sysfs_set_num(sra
, NULL
, "layout", info
->array
.layout
);
327 rv
|= sysfs_set_num(sra
, NULL
, "component_size", info
->component_size
);
328 sra
->array
= info
->array
;
332 int sysfs_add_disk(struct mdinfo
*sra
, int fd
, struct mdinfo
*sd
)
340 sprintf(dv
, "%d:%d", sd
->disk
.major
, sd
->disk
.minor
);
341 rv
= sysfs_set_str(sra
, NULL
, "new_dev", dv
);
345 memset(nm
, 0, sizeof(nm
));
346 sprintf(dv
, "/sys/dev/block/%d:%d", sd
->disk
.major
, sd
->disk
.minor
);
347 if (readlink(dv
, nm
, sizeof(nm
)) < 0)
349 dname
= strrchr(nm
, '/');
351 strcpy(sd
->sys_name
, "dev-");
352 strcpy(sd
->sys_name
+4, dname
);
354 rv
|= sysfs_set_num(sra
, sd
, "offset", sd
->data_offset
);
355 rv
|= sysfs_set_num(sra
, sd
, "size", (sd
->component_size
+1) / 2);
356 if (sra
->array
.level
!= LEVEL_CONTAINER
) {
357 rv
|= sysfs_set_num(sra
, sd
, "slot", sd
->disk
.raid_disk
);
358 // rv |= sysfs_set_str(sra, sd, "state", "in_sync");
360 sd2
= malloc(sizeof(*sd2
));
362 sd2
->next
= sra
->devs
;