]>
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 struct sysarray
*sysfs_read(int fd
, int devnum
, unsigned long options
)
47 /* Longest possible name in sysfs, mounted at /sys, is
48 * /sys/block/md_dXXX/md/dev-XXXXX/block/dev
49 * /sys/block/md_dXXX/md/metadata_version
50 * which is about 41 characters. 50 should do for now
61 sra
= malloc(sizeof(*sra
));
67 if (fstat(fd
, &stb
)) return NULL
;
68 if (major(stb
.st_rdev
)==9)
69 sprintf(sra
->name
, "md%d", minor(stb
.st_rdev
));
71 sprintf(sra
->name
, "md_d%d",
72 minor(stb
.st_rdev
)>>MdpMinorShift
);
75 sprintf(sra
->name
, "md%d", devnum
);
77 sprintf(sra
->name
, "md_d%d",
80 sprintf(fname
, "/sys/block/%s/md/", sra
->name
);
81 base
= fname
+ strlen(fname
);
84 if (options
& GET_LEVEL
) {
85 strcpy(base
, "level");
86 if (load_sys(fname
, buf
))
88 sra
->level
= map_name(pers
, buf
);
90 if (options
& GET_LAYOUT
) {
91 strcpy(base
, "layout");
92 if (load_sys(fname
, buf
))
94 sra
->layout
= strtoul(buf
, NULL
, 0);
96 if (options
& GET_COMPONENT
) {
97 strcpy(base
, "component_size");
98 if (load_sys(fname
, buf
))
100 sra
->component_size
= strtoull(buf
, NULL
, 0);
101 /* sysfs reports "K", but we want sectors */
102 sra
->component_size
*= 2;
104 if (options
& GET_CHUNK
) {
105 strcpy(base
, "chunk_size");
106 if (load_sys(fname
, buf
))
108 sra
->chunk
= strtoul(buf
, NULL
, 0);
110 if (options
& GET_CACHE
) {
111 strcpy(base
, "stripe_cache_size");
112 if (load_sys(fname
, buf
))
114 sra
->cache_size
= strtoul(buf
, NULL
, 0);
116 if (options
& GET_MISMATCH
) {
117 strcpy(base
, "mismatch_cnt");
118 if (load_sys(fname
, buf
))
120 sra
->mismatch_cnt
= strtoul(buf
, NULL
, 0);
123 if (! (options
& GET_DEVS
))
126 /* Get all the devices as well */
128 dir
= opendir(fname
);
133 while ((de
= readdir(dir
)) != NULL
) {
135 if (de
->d_ino
== 0 ||
136 strncmp(de
->d_name
, "dev-", 4) != 0)
138 strcpy(base
, de
->d_name
);
139 dbase
= base
+ strlen(base
);
142 dev
= malloc(sizeof(*dev
));
145 dev
->next
= sra
->devs
;
148 /* Always get slot, major, minor */
149 strcpy(dbase
, "slot");
150 if (load_sys(fname
, buf
))
152 dev
->role
= strtoul(buf
, &ep
, 10);
153 if (*ep
) dev
->role
= -1;
155 strcpy(dbase
, "block/dev");
156 if (load_sys(fname
, buf
))
158 sscanf(buf
, "%d:%d", &dev
->major
, &dev
->minor
);
160 if (options
& GET_OFFSET
) {
161 strcpy(dbase
, "offset");
162 if (load_sys(fname
, buf
))
164 dev
->offset
= strtoull(buf
, NULL
, 0);
166 if (options
& GET_SIZE
) {
167 strcpy(dbase
, "size");
168 if (load_sys(fname
, buf
))
170 dev
->size
= strtoull(buf
, NULL
, 0);
172 if (options
& GET_STATE
) {
174 strcpy(dbase
, "state");
175 if (load_sys(fname
, buf
))
177 if (strstr(buf
, "in_sync"))
178 dev
->state
|= (1<<MD_DISK_SYNC
);
179 if (strstr(buf
, "faulty"))
180 dev
->state
|= (1<<MD_DISK_FAULTY
);
184 if (options
& GET_ERROR
) {
185 strcpy(buf
, "errors");
186 if (load_sys(fname
, buf
))
188 dev
->errors
= strtoul(buf
, NULL
, 0);
194 while (sra
&& sra
->devs
) {
196 sra
->devs
= dev
->next
;
203 unsigned long long get_component_size(int fd
)
205 /* Find out the component size of the array.
206 * We cannot trust GET_ARRAY_INFO ioctl as it's
207 * size field is only 32bits.
208 * So look in /sys/block/mdXXX/md/component_size
210 * This returns in units of sectors.
215 if (fstat(fd
, &stb
)) return 0;
216 if (major(stb
.st_rdev
) == 9)
217 sprintf(fname
, "/sys/block/md%d/md/component_size",
220 sprintf(fname
, "/sys/block/md_d%d/md/component_size",
221 minor(stb
.st_rdev
)>>MdpMinorShift
);
222 fd
= open(fname
, O_RDONLY
);
225 n
= read(fd
, fname
, sizeof(fname
));
227 if (n
== sizeof(fname
))
230 return strtoull(fname
, NULL
, 10) * 2;
233 int sysfs_set_str(struct sysarray
*sra
, struct sysdev
*dev
,
234 char *name
, char *val
)
239 sprintf(fname
, "/sys/block/%s/md/%s/%s",
240 sra
->name
, dev
?dev
->name
:"", name
);
241 fd
= open(fname
, O_WRONLY
);
244 n
= write(fd
, val
, strlen(val
));
246 if (n
!= strlen(val
))
251 int sysfs_set_num(struct sysarray
*sra
, struct sysdev
*dev
,
252 char *name
, unsigned long long val
)
255 sprintf(valstr
, "%llu", val
);
256 return sysfs_set_str(sra
, dev
, name
, valstr
);
259 int sysfs_get_ll(struct sysarray
*sra
, struct sysdev
*dev
,
260 char *name
, unsigned long long *val
)
267 sprintf(fname
, "/sys/block/%s/md/%s/%s",
268 sra
->name
, dev
?dev
->name
:"", name
);
269 fd
= open(fname
, O_RDONLY
);
272 n
= read(fd
, buf
, sizeof(buf
));
277 *val
= strtoull(buf
, &ep
, 0);
278 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))