]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - sysfs.c
f198d1646e4930d33f70173d646d33ec900c5bfc
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", minor(stb
.st_rdev
));
89 sprintf(sra
->sys_name
, "md_d%d",
90 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;
111 &sra
->array
.major_version
,
112 &sra
->array
.minor_version
);
114 if (options
& GET_LEVEL
) {
115 strcpy(base
, "level");
116 if (load_sys(fname
, buf
))
118 sra
->array
.level
= map_name(pers
, buf
);
120 if (options
& GET_LAYOUT
) {
121 strcpy(base
, "layout");
122 if (load_sys(fname
, buf
))
124 sra
->array
.layout
= strtoul(buf
, NULL
, 0);
126 if (options
& GET_COMPONENT
) {
127 strcpy(base
, "component_size");
128 if (load_sys(fname
, buf
))
130 sra
->component_size
= strtoull(buf
, NULL
, 0);
131 /* sysfs reports "K", but we want sectors */
132 sra
->component_size
*= 2;
134 if (options
& GET_CHUNK
) {
135 strcpy(base
, "chunk_size");
136 if (load_sys(fname
, buf
))
138 sra
->array
.chunk_size
= strtoul(buf
, NULL
, 0);
140 if (options
& GET_CACHE
) {
141 strcpy(base
, "stripe_cache_size");
142 if (load_sys(fname
, buf
))
144 sra
->cache_size
= strtoul(buf
, NULL
, 0);
146 if (options
& GET_MISMATCH
) {
147 strcpy(base
, "mismatch_cnt");
148 if (load_sys(fname
, buf
))
150 sra
->mismatch_cnt
= strtoul(buf
, NULL
, 0);
153 if (! (options
& GET_DEVS
))
156 /* Get all the devices as well */
158 dir
= opendir(fname
);
161 sra
->array
.spare_disks
= 0;
163 while ((de
= readdir(dir
)) != NULL
) {
165 if (de
->d_ino
== 0 ||
166 strncmp(de
->d_name
, "dev-", 4) != 0)
168 strcpy(base
, de
->d_name
);
169 dbase
= base
+ strlen(base
);
172 dev
= malloc(sizeof(*dev
));
175 dev
->next
= sra
->devs
;
177 strcpy(dev
->sys_name
, de
->d_name
);
179 /* Always get slot, major, minor */
180 strcpy(dbase
, "slot");
181 if (load_sys(fname
, buf
))
183 dev
->disk
.raid_disk
= strtoul(buf
, &ep
, 10);
184 if (*ep
) dev
->disk
.raid_disk
= -1;
186 strcpy(dbase
, "block/dev");
187 if (load_sys(fname
, buf
))
189 sscanf(buf
, "%d:%d", &dev
->disk
.major
, &dev
->disk
.minor
);
191 if (options
& GET_OFFSET
) {
192 strcpy(dbase
, "offset");
193 if (load_sys(fname
, buf
))
195 dev
->data_offset
= strtoull(buf
, NULL
, 0);
197 if (options
& GET_SIZE
) {
198 strcpy(dbase
, "size");
199 if (load_sys(fname
, buf
))
201 dev
->component_size
= strtoull(buf
, NULL
, 0);
203 if (options
& GET_STATE
) {
205 strcpy(dbase
, "state");
206 if (load_sys(fname
, buf
))
208 if (strstr(buf
, "in_sync"))
209 dev
->disk
.state
|= (1<<MD_DISK_SYNC
);
210 if (strstr(buf
, "faulty"))
211 dev
->disk
.state
|= (1<<MD_DISK_FAULTY
);
212 if (dev
->disk
.state
== 0)
213 sra
->array
.spare_disks
++;
215 if (options
& GET_ERROR
) {
216 strcpy(buf
, "errors");
217 if (load_sys(fname
, buf
))
219 dev
->errors
= strtoul(buf
, NULL
, 0);
229 unsigned long long get_component_size(int fd
)
231 /* Find out the component size of the array.
232 * We cannot trust GET_ARRAY_INFO ioctl as it's
233 * size field is only 32bits.
234 * So look in /sys/block/mdXXX/md/component_size
236 * This returns in units of sectors.
241 if (fstat(fd
, &stb
)) return 0;
242 if (major(stb
.st_rdev
) == 9)
243 sprintf(fname
, "/sys/block/md%d/md/component_size",
246 sprintf(fname
, "/sys/block/md_d%d/md/component_size",
247 minor(stb
.st_rdev
)>>MdpMinorShift
);
248 fd
= open(fname
, O_RDONLY
);
251 n
= read(fd
, fname
, sizeof(fname
));
253 if (n
== sizeof(fname
))
256 return strtoull(fname
, NULL
, 10) * 2;
259 int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
260 char *name
, char *val
)
265 sprintf(fname
, "/sys/block/%s/md/%s/%s",
266 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
267 fd
= open(fname
, O_WRONLY
);
270 n
= write(fd
, val
, strlen(val
));
272 if (n
!= strlen(val
))
277 int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
278 char *name
, unsigned long long val
)
281 sprintf(valstr
, "%llu", val
);
282 return sysfs_set_str(sra
, dev
, name
, valstr
);
285 int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
286 char *name
, unsigned long long *val
)
293 sprintf(fname
, "/sys/block/%s/md/%s/%s",
294 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
295 fd
= open(fname
, O_RDONLY
);
298 n
= read(fd
, buf
, sizeof(buf
));
303 *val
= strtoull(buf
, &ep
, 0);
304 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))