]>
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
)/16);
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);
102 if (options
& GET_CHUNK
) {
103 strcpy(base
, "chunk_size");
104 if (load_sys(fname
, buf
))
106 sra
->chunk
= strtoul(buf
, NULL
, 0);
109 if (! (options
& GET_DEVS
))
112 /* Get all the devices as well */
114 dir
= opendir(fname
);
119 while ((de
= readdir(dir
)) != NULL
) {
121 if (de
->d_ino
== 0 ||
122 strncmp(de
->d_name
, "dev-", 4) != 0)
124 strcpy(base
, de
->d_name
);
125 dbase
= base
+ strlen(base
);
128 dev
= malloc(sizeof(*dev
));
131 dev
->next
= sra
->devs
;
134 /* Always get slot, major, minor */
135 strcpy(dbase
, "slot");
136 if (load_sys(fname
, buf
))
138 dev
->role
= strtoul(buf
, &ep
, 10);
139 if (*ep
) dev
->role
= -1;
141 strcpy(dbase
, "block/dev");
142 if (load_sys(fname
, buf
))
144 sscanf(buf
, "%d:%d", &dev
->major
, &dev
->minor
);
146 if (options
& GET_OFFSET
) {
147 strcpy(dbase
, "offset");
148 if (load_sys(fname
, buf
))
150 dev
->offset
= strtoull(buf
, NULL
, 0);
152 if (options
& GET_SIZE
) {
153 strcpy(dbase
, "size");
154 if (load_sys(fname
, buf
))
156 dev
->size
= strtoull(buf
, NULL
, 0);
158 if (options
& GET_STATE
) {
160 strcpy(dbase
, "state");
161 if (load_sys(fname
, buf
))
163 if (strstr(buf
, "in_sync"))
164 dev
->state
|= (1<<MD_DISK_SYNC
);
165 if (strstr(buf
, "faulty"))
166 dev
->state
|= (1<<MD_DISK_FAULTY
);
170 if (options
& GET_ERROR
) {
171 strcpy(buf
, "errors");
172 if (load_sys(fname
, buf
))
174 dev
->errors
= strtoul(buf
, NULL
, 0);
180 while (sra
&& sra
->devs
) {
182 sra
->devs
= dev
->next
;
189 unsigned long long get_component_size(int fd
)
191 /* Find out the component size of the array.
192 * We cannot trust GET_ARRAY_INFO ioctl as it's
193 * size field is only 32bits.
194 * So look in /sys/block/mdXXX/md/component_size
199 if (fstat(fd
, &stb
)) return 0;
200 if (major(stb
.st_rdev
) == 9)
201 sprintf(fname
, "/sys/block/md%d/md/component_size",
204 sprintf(fname
, "/sys/block/md_d%d/md/component_size",
205 minor(stb
.st_rdev
)/16);
206 fd
= open(fname
, O_RDONLY
);
209 n
= read(fd
, fname
, sizeof(fname
));
211 if (n
== sizeof(fname
))
214 return strtoull(fname
, NULL
, 10);
217 int sysfs_set_str(struct sysarray
*sra
, struct sysdev
*dev
,
218 char *name
, char *val
)
223 sprintf(fname
, "/sys/block/%s/md/%s/%s",
224 sra
->name
, dev
?dev
->name
:"", name
);
225 fd
= open(fname
, O_WRONLY
);
228 n
= write(fd
, val
, strlen(val
));
230 if (n
!= strlen(val
))
235 int sysfs_set_num(struct sysarray
*sra
, struct sysdev
*dev
,
236 char *name
, unsigned long long val
)
239 sprintf(valstr
, "%llu", val
);
240 return sysfs_set_str(sra
, dev
, name
, valstr
);
243 int sysfs_get_ll(struct sysarray
*sra
, struct sysdev
*dev
,
244 char *name
, unsigned long long *val
)
251 sprintf(fname
, "/sys/block/%s/md/%s/%s",
252 sra
->name
, dev
?dev
->name
:"", name
);
253 fd
= open(fname
, O_RDONLY
);
256 n
= read(fd
, buf
, sizeof(buf
));
261 *val
= strtoull(buf
, &ep
, 0);
262 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))