2 * sysfs - extract md related information from sysfs. Part of:
3 * mdadm - manage Linux "md" devices aka RAID arrays.
5 * Copyright (C) 2006-2009 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>
30 #define MAX_SYSFS_PATH_LEN 120
32 int load_sys(char *path
, char *buf
, int len
)
34 int fd
= open(path
, O_RDONLY
);
38 n
= read(fd
, buf
, len
);
43 if (n
&& buf
[n
-1] == '\n')
48 void sysfs_free(struct mdinfo
*sra
)
51 struct mdinfo
*sra2
= sra
->next
;
53 struct mdinfo
*d
= sra
->devs
;
58 free(sra
->bb
.entries
);
64 int sysfs_open(char *devnm
, char *devname
, char *attr
)
66 char fname
[MAX_SYSFS_PATH_LEN
];
69 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/", devnm
);
71 strncat(fname
, devname
, MAX_SYSFS_PATH_LEN
- strlen(fname
));
72 strncat(fname
, "/", MAX_SYSFS_PATH_LEN
- strlen(fname
));
74 strncat(fname
, attr
, MAX_SYSFS_PATH_LEN
- strlen(fname
));
75 fd
= open(fname
, O_RDWR
);
76 if (fd
< 0 && errno
== EACCES
)
77 fd
= open(fname
, O_RDONLY
);
81 void sysfs_init_dev(struct mdinfo
*mdi
, unsigned long devid
)
83 snprintf(mdi
->sys_name
,
84 sizeof(mdi
->sys_name
), "dev-%s", devid2kname(devid
));
87 void sysfs_init(struct mdinfo
*mdi
, int fd
, char *devnm
)
90 char fname
[MAX_SYSFS_PATH_LEN
];
99 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md", devnm
);
101 if (stat(fname
, &stb
))
103 if (!S_ISDIR(stb
.st_mode
))
105 strcpy(mdi
->sys_name
, devnm
);
108 struct mdinfo
*sysfs_read(int fd
, char *devnm
, unsigned long options
)
110 char fname
[PATH_MAX
];
115 struct mdinfo
*dev
, **devp
;
119 sra
= xcalloc(1, sizeof(*sra
));
120 sysfs_init(sra
, fd
, devnm
);
121 if (sra
->sys_name
[0] == 0) {
126 sprintf(fname
, "/sys/block/%s/md/", sra
->sys_name
);
127 base
= fname
+ strlen(fname
);
130 if (options
& GET_VERSION
) {
131 strcpy(base
, "metadata_version");
132 if (load_sys(fname
, buf
, sizeof(buf
)))
134 if (strncmp(buf
, "none", 4) == 0) {
135 sra
->array
.major_version
=
136 sra
->array
.minor_version
= -1;
137 strcpy(sra
->text_version
, "");
138 } else if (strncmp(buf
, "external:", 9) == 0) {
139 sra
->array
.major_version
= -1;
140 sra
->array
.minor_version
= -2;
141 strcpy(sra
->text_version
, buf
+9);
144 &sra
->array
.major_version
,
145 &sra
->array
.minor_version
);
146 strcpy(sra
->text_version
, buf
);
149 if (options
& GET_LEVEL
) {
150 strcpy(base
, "level");
151 if (load_sys(fname
, buf
, sizeof(buf
)))
153 sra
->array
.level
= map_name(pers
, buf
);
155 if (options
& GET_LAYOUT
) {
156 strcpy(base
, "layout");
157 if (load_sys(fname
, buf
, sizeof(buf
)))
159 sra
->array
.layout
= strtoul(buf
, NULL
, 0);
161 if (options
& GET_DISKS
) {
162 strcpy(base
, "raid_disks");
163 if (load_sys(fname
, buf
, sizeof(buf
)))
165 sra
->array
.raid_disks
= strtoul(buf
, NULL
, 0);
167 if (options
& GET_DEGRADED
) {
168 strcpy(base
, "degraded");
169 if (load_sys(fname
, buf
, sizeof(buf
)))
171 sra
->array
.failed_disks
= strtoul(buf
, NULL
, 0);
173 if (options
& GET_COMPONENT
) {
174 strcpy(base
, "component_size");
175 if (load_sys(fname
, buf
, sizeof(buf
)))
177 sra
->component_size
= strtoull(buf
, NULL
, 0);
178 /* sysfs reports "K", but we want sectors */
179 sra
->component_size
*= 2;
181 if (options
& GET_CHUNK
) {
182 strcpy(base
, "chunk_size");
183 if (load_sys(fname
, buf
, sizeof(buf
)))
185 sra
->array
.chunk_size
= strtoul(buf
, NULL
, 0);
187 if (options
& GET_CACHE
) {
188 strcpy(base
, "stripe_cache_size");
189 if (load_sys(fname
, buf
, sizeof(buf
)))
190 /* Probably level doesn't support it */
193 sra
->cache_size
= strtoul(buf
, NULL
, 0);
195 if (options
& GET_MISMATCH
) {
196 strcpy(base
, "mismatch_cnt");
197 if (load_sys(fname
, buf
, sizeof(buf
)))
199 sra
->mismatch_cnt
= strtoul(buf
, NULL
, 0);
201 if (options
& GET_SAFEMODE
) {
208 strcpy(base
, "safe_mode_delay");
209 if (load_sys(fname
, buf
, sizeof(buf
)))
212 /* remove a period, and count digits after it */
214 for (i
= 0; i
< len
; i
++) {
216 if (isdigit(buf
[i
])) {
221 } else if (buf
[i
] == '.') {
226 msec
= strtoul(buf
, NULL
, 10);
227 msec
= (msec
* 1000) / scale
;
228 sra
->safe_mode_delay
= msec
;
230 if (options
& GET_BITMAP_LOCATION
) {
231 strcpy(base
, "bitmap/location");
232 if (load_sys(fname
, buf
, sizeof(buf
)))
234 if (strncmp(buf
, "file", 4) == 0)
235 sra
->bitmap_offset
= 1;
236 else if (strncmp(buf
, "none", 4) == 0)
237 sra
->bitmap_offset
= 0;
238 else if (buf
[0] == '+')
239 sra
->bitmap_offset
= strtol(buf
+1, NULL
, 10);
244 if (options
& GET_ARRAY_STATE
) {
245 strcpy(base
, "array_state");
246 if (load_sys(fname
, sra
->sysfs_array_state
,
247 sizeof(sra
->sysfs_array_state
)))
250 sra
->sysfs_array_state
[0] = 0;
252 if (options
& GET_CONSISTENCY_POLICY
) {
253 strcpy(base
, "consistency_policy");
254 if (load_sys(fname
, buf
, sizeof(buf
))) {
255 sra
->consistency_policy
= CONSISTENCY_POLICY_UNKNOWN
;
257 sra
->consistency_policy
= map_name(consistency_policies
, buf
);
258 if (sra
->consistency_policy
== UnSet
)
259 sra
->consistency_policy
= CONSISTENCY_POLICY_UNKNOWN
;
263 if (! (options
& GET_DEVS
))
266 /* Get all the devices as well */
268 dir
= opendir(fname
);
271 sra
->array
.spare_disks
= 0;
275 while ((de
= readdir(dir
)) != NULL
) {
277 if (de
->d_ino
== 0 ||
278 strncmp(de
->d_name
, "dev-", 4) != 0)
280 strcpy(base
, de
->d_name
);
281 dbase
= base
+ strlen(base
);
284 dev
= xcalloc(1, sizeof(*dev
));
286 /* Always get slot, major, minor */
287 strcpy(dbase
, "slot");
288 if (load_sys(fname
, buf
, sizeof(buf
))) {
289 /* hmm... unable to read 'slot' maybe the device
292 strcpy(dbase
, "block");
293 if (readlink(fname
, buf
, sizeof(buf
)) < 0 &&
294 errno
!= ENAMETOOLONG
) {
295 /* ...yup device is gone */
299 /* slot is unreadable but 'block' link
300 * still intact... something bad is happening
308 strcpy(dev
->sys_name
, de
->d_name
);
309 dev
->disk
.raid_disk
= strtoul(buf
, &ep
, 10);
310 if (*ep
) dev
->disk
.raid_disk
= -1;
312 strcpy(dbase
, "block/dev");
313 if (load_sys(fname
, buf
, sizeof(buf
))) {
314 /* assume this is a stale reference to a hot
320 sra
->array
.nr_disks
++;
321 sscanf(buf
, "%d:%d", &dev
->disk
.major
, &dev
->disk
.minor
);
323 /* special case check for block devices that can go 'offline' */
324 strcpy(dbase
, "block/device/state");
325 if (load_sys(fname
, buf
, sizeof(buf
)) == 0 &&
326 strncmp(buf
, "offline", 7) == 0) {
331 /* finally add this disk to the array */
336 if (options
& GET_OFFSET
) {
337 strcpy(dbase
, "offset");
338 if (load_sys(fname
, buf
, sizeof(buf
)))
340 dev
->data_offset
= strtoull(buf
, NULL
, 0);
341 strcpy(dbase
, "new_offset");
342 if (load_sys(fname
, buf
, sizeof(buf
)) == 0)
343 dev
->new_data_offset
= strtoull(buf
, NULL
, 0);
345 dev
->new_data_offset
= dev
->data_offset
;
347 if (options
& GET_SIZE
) {
348 strcpy(dbase
, "size");
349 if (load_sys(fname
, buf
, sizeof(buf
)))
351 dev
->component_size
= strtoull(buf
, NULL
, 0) * 2;
353 if (options
& GET_STATE
) {
355 strcpy(dbase
, "state");
356 if (load_sys(fname
, buf
, sizeof(buf
)))
358 if (strstr(buf
, "in_sync"))
359 dev
->disk
.state
|= (1<<MD_DISK_SYNC
);
360 if (strstr(buf
, "faulty"))
361 dev
->disk
.state
|= (1<<MD_DISK_FAULTY
);
362 if (dev
->disk
.state
== 0)
363 sra
->array
.spare_disks
++;
365 if (options
& GET_ERROR
) {
366 strcpy(buf
, "errors");
367 if (load_sys(fname
, buf
, sizeof(buf
)))
369 dev
->errors
= strtoul(buf
, NULL
, 0);
382 int sysfs_attr_match(const char *attr
, const char *str
)
384 /* See if attr, read from a sysfs file, matches
385 * str. They must either be the same, or attr can
386 * have a trailing newline or comma
388 while (*attr
&& *str
&& *attr
== *str
) {
393 if (*str
|| (*attr
&& *attr
!= ',' && *attr
!= '\n'))
398 int sysfs_match_word(const char *word
, char **list
)
401 for (n
=0; list
[n
]; n
++)
402 if (sysfs_attr_match(word
, list
[n
]))
407 unsigned long long get_component_size(int fd
)
409 /* Find out the component size of the array.
410 * We cannot trust GET_ARRAY_INFO ioctl as it's
411 * size field is only 32bits.
412 * So look in /sys/block/mdXXX/md/component_size
414 * This returns in units of sectors.
417 char fname
[MAX_SYSFS_PATH_LEN
];
421 snprintf(fname
, MAX_SYSFS_PATH_LEN
,
422 "/sys/block/%s/md/component_size", stat2devnm(&stb
));
423 fd
= open(fname
, O_RDONLY
);
426 n
= read(fd
, fname
, sizeof(fname
));
428 if (n
< 0 || n
== sizeof(fname
))
431 return strtoull(fname
, NULL
, 10) * 2;
434 int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
435 char *name
, char *val
)
437 char fname
[MAX_SYSFS_PATH_LEN
];
441 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/%s/%s",
442 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
443 fd
= open(fname
, O_WRONLY
);
446 n
= write(fd
, val
, strlen(val
));
448 if (n
!= strlen(val
)) {
449 dprintf("failed to write '%s' to '%s' (%s)\n",
450 val
, fname
, strerror(errno
));
456 int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
457 char *name
, unsigned long long val
)
460 sprintf(valstr
, "%llu", val
);
461 return sysfs_set_str(sra
, dev
, name
, valstr
);
464 int sysfs_set_num_signed(struct mdinfo
*sra
, struct mdinfo
*dev
,
465 char *name
, long long val
)
468 sprintf(valstr
, "%lli", val
);
469 return sysfs_set_str(sra
, dev
, name
, valstr
);
472 int sysfs_uevent(struct mdinfo
*sra
, char *event
)
474 char fname
[MAX_SYSFS_PATH_LEN
];
478 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/uevent",
480 fd
= open(fname
, O_WRONLY
);
483 n
= write(fd
, event
, strlen(event
));
485 if (n
!= (int)strlen(event
)) {
486 dprintf("failed to write '%s' to '%s' (%s)\n",
487 event
, fname
, strerror(errno
));
493 int sysfs_attribute_available(struct mdinfo
*sra
, struct mdinfo
*dev
, char *name
)
495 char fname
[MAX_SYSFS_PATH_LEN
];
498 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/%s/%s",
499 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
501 return stat(fname
, &st
) == 0;
504 int sysfs_get_fd(struct mdinfo
*sra
, struct mdinfo
*dev
,
507 char fname
[MAX_SYSFS_PATH_LEN
];
510 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/%s/%s",
511 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
512 fd
= open(fname
, O_RDWR
);
514 fd
= open(fname
, O_RDONLY
);
518 int sysfs_fd_get_ll(int fd
, unsigned long long *val
)
525 n
= read(fd
, buf
, sizeof(buf
));
526 if (n
<= 0 || n
== sizeof(buf
))
529 *val
= strtoull(buf
, &ep
, 0);
530 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))
535 int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
536 char *name
, unsigned long long *val
)
541 fd
= sysfs_get_fd(sra
, dev
, name
);
544 n
= sysfs_fd_get_ll(fd
, val
);
549 int sysfs_fd_get_two(int fd
, unsigned long long *v1
, unsigned long long *v2
)
551 /* two numbers in this sysfs file, either
561 n
= read(fd
, buf
, sizeof(buf
));
562 if (n
<= 0 || n
== sizeof(buf
))
565 *v1
= strtoull(buf
, &ep
, 0);
566 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))
568 while (*ep
== ' ' || *ep
== '/' || *ep
== '(')
570 *v2
= strtoull(ep
, &ep2
, 0);
571 if (ep2
== ep
|| (*ep2
!= 0 && *ep2
!= '\n' && *ep2
!= ' ' && *ep2
!= ')')) {
578 int sysfs_get_two(struct mdinfo
*sra
, struct mdinfo
*dev
,
579 char *name
, unsigned long long *v1
, unsigned long long *v2
)
584 fd
= sysfs_get_fd(sra
, dev
, name
);
587 n
= sysfs_fd_get_two(fd
, v1
, v2
);
592 int sysfs_fd_get_str(int fd
, char *val
, int size
)
597 n
= read(fd
, val
, size
);
598 if (n
<= 0 || n
== size
)
604 int sysfs_get_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
605 char *name
, char *val
, int size
)
610 fd
= sysfs_get_fd(sra
, dev
, name
);
613 n
= sysfs_fd_get_str(fd
, val
, size
);
618 int sysfs_set_safemode(struct mdinfo
*sra
, unsigned long ms
)
627 sprintf(delay
, "%ld.%03ld\n", sec
, msec
);
628 /* this '\n' ^ needed for kernels older than 2.6.28 */
629 return sysfs_set_str(sra
, NULL
, "safe_mode_delay", delay
);
632 int sysfs_set_array(struct mdinfo
*info
, int vers
)
636 int raid_disks
= info
->array
.raid_disks
;
639 if (info
->array
.major_version
== -1 &&
640 info
->array
.minor_version
== -2) {
643 strcat(strcpy(ver
, "external:"), info
->text_version
);
645 /* meta version might already be set if we are setting
646 * new geometry for a reshape. In that case we don't
647 * want to over-write the 'readonly' flag that is
648 * stored in the metadata version. So read the current
649 * version first, and preserve the flag
651 if (sysfs_get_str(info
, NULL
, "metadata_version",
653 if (strlen(buf
) >= 9 && buf
[9] == '-')
656 if ((vers
% 100) < 2 ||
657 sysfs_set_str(info
, NULL
, "metadata_version",
659 pr_err("This kernel does not support external metadata.\n");
663 if (info
->array
.level
< 0)
664 return 0; /* FIXME */
665 rv
|= sysfs_set_str(info
, NULL
, "level",
666 map_num(pers
, info
->array
.level
));
667 if (info
->reshape_active
&& info
->delta_disks
!= UnSet
)
668 raid_disks
-= info
->delta_disks
;
669 rv
|= sysfs_set_num(info
, NULL
, "raid_disks", raid_disks
);
670 rv
|= sysfs_set_num(info
, NULL
, "chunk_size", info
->array
.chunk_size
);
671 rv
|= sysfs_set_num(info
, NULL
, "layout", info
->array
.layout
);
672 rv
|= sysfs_set_num(info
, NULL
, "component_size", info
->component_size
/2);
673 if (info
->custom_array_size
) {
676 rc
= sysfs_set_num(info
, NULL
, "array_size",
677 info
->custom_array_size
/2);
678 if (rc
&& errno
== ENOENT
) {
679 pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n");
685 if (info
->array
.level
> 0)
686 rv
|= sysfs_set_num(info
, NULL
, "resync_start", info
->resync_start
);
688 if (info
->reshape_active
) {
689 rv
|= sysfs_set_num(info
, NULL
, "reshape_position",
690 info
->reshape_progress
);
691 rv
|= sysfs_set_num(info
, NULL
, "chunk_size", info
->new_chunk
);
692 rv
|= sysfs_set_num(info
, NULL
, "layout", info
->new_layout
);
693 rv
|= sysfs_set_num(info
, NULL
, "raid_disks",
694 info
->array
.raid_disks
);
695 /* We don't set 'new_level' here. That can only happen
696 * once the reshape completes.
700 if (info
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
701 if (sysfs_set_str(info
, NULL
, "consistency_policy",
702 map_num(consistency_policies
,
703 info
->consistency_policy
))) {
704 pr_err("This kernel does not support PPL\n");
712 int sysfs_add_disk(struct mdinfo
*sra
, struct mdinfo
*sd
, int resume
)
720 sprintf(dv
, "%d:%d", sd
->disk
.major
, sd
->disk
.minor
);
721 rv
= sysfs_set_str(sra
, NULL
, "new_dev", dv
);
725 memset(nm
, 0, sizeof(nm
));
726 dname
= devid2kname(makedev(sd
->disk
.major
, sd
->disk
.minor
));
727 strcpy(sd
->sys_name
, "dev-");
728 strcpy(sd
->sys_name
+4, dname
);
730 /* test write to see if 'recovery_start' is available */
731 if (resume
&& sd
->recovery_start
< MaxSector
&&
732 sysfs_set_num(sra
, sd
, "recovery_start", 0)) {
733 sysfs_set_str(sra
, sd
, "state", "remove");
737 rv
= sysfs_set_num(sra
, sd
, "offset", sd
->data_offset
);
738 rv
|= sysfs_set_num(sra
, sd
, "size", (sd
->component_size
+1) / 2);
739 if (sra
->array
.level
!= LEVEL_CONTAINER
) {
740 if (sd
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
741 rv
|= sysfs_set_num(sra
, sd
, "ppl_sector", sd
->ppl_sector
);
742 rv
|= sysfs_set_num(sra
, sd
, "ppl_size", sd
->ppl_size
);
744 if (sd
->recovery_start
== MaxSector
)
745 /* This can correctly fail if array isn't started,
746 * yet, so just ignore status for now.
748 sysfs_set_str(sra
, sd
, "state", "insync");
749 if (sd
->disk
.raid_disk
>= 0)
750 rv
|= sysfs_set_num(sra
, sd
, "slot", sd
->disk
.raid_disk
);
752 sysfs_set_num(sra
, sd
, "recovery_start", sd
->recovery_start
);
754 if (sd
->bb
.supported
) {
755 if (sysfs_set_str(sra
, sd
, "state", "external_bbl")) {
757 * backward compatibility - if kernel doesn't support
758 * bad blocks for external metadata, let it continue
759 * as long as there are none known so far
762 pr_err("The kernel has no support for bad blocks in external metadata\n");
767 for (i
= 0; i
< sd
->bb
.count
; i
++) {
769 const struct md_bb_entry
*entry
= &sd
->bb
.entries
[i
];
771 snprintf(s
, sizeof(s
) - 1, "%llu %d\n", entry
->sector
,
773 rv
|= sysfs_set_str(sra
, sd
, "bad_blocks", s
);
780 int sysfs_disk_to_sg(int fd
)
782 /* from an open block device, try find and open its corresponding
783 * scsi_generic interface
788 char sg_major_minor
[10];
792 int major
, minor
, rv
;
797 snprintf(path
, sizeof(path
), "/sys/dev/block/%d:%d/device",
798 major(st
.st_rdev
), minor(st
.st_rdev
));
806 if (strncmp("scsi_generic:", de
->d_name
,
807 strlen("scsi_generic:")) == 0)
816 snprintf(sg_path
, sizeof(sg_path
), "%s/%s/dev", path
, de
->d_name
);
817 fd
= open(sg_path
, O_RDONLY
);
821 rv
= read(fd
, sg_major_minor
, sizeof(sg_major_minor
));
823 if (rv
< 0 || rv
== sizeof(sg_major_minor
))
826 sg_major_minor
[rv
- 1] = '\0';
828 c
= strchr(sg_major_minor
, ':');
831 major
= strtol(sg_major_minor
, NULL
, 10);
832 minor
= strtol(c
, NULL
, 10);
833 snprintf(path
, sizeof(path
), "/dev/.tmp.md.%d:%d:%d",
834 (int) getpid(), major
, minor
);
835 if (mknod(path
, S_IFCHR
|0600, makedev(major
, minor
))==0) {
836 fd
= open(path
, O_RDONLY
);
845 int sysfs_disk_to_scsi_id(int fd
, __u32
*id
)
847 /* from an open block device, try to retrieve it scsi_id */
852 int host
, bus
, target
, lun
;
857 snprintf(path
, sizeof(path
), "/sys/dev/block/%d:%d/device/scsi_device",
858 major(st
.st_rdev
), minor(st
.st_rdev
));
864 for (de
= readdir(dir
); de
; de
= readdir(dir
)) {
867 if (de
->d_type
!= DT_DIR
)
870 count
= sscanf(de
->d_name
, "%d:%d:%d:%d", &host
, &bus
, &target
, &lun
);
879 *id
= (host
<< 24) | (bus
<< 16) | (target
<< 8) | (lun
<< 0);
883 int sysfs_unique_holder(char *devnm
, long rdev
)
885 /* Check that devnm is a holder of rdev,
886 * and is the only holder.
887 * we should be locked against races by
890 * 0 - not unique, not even a holder
891 * 1 - unique, this is the only holder.
892 * 2/3 - not unique, there is another holder
893 * -1 - error, cannot find the holders
900 sprintf(dirname
, "/sys/dev/block/%d:%d/holders",
901 major(rdev
), minor(rdev
));
902 dir
= opendir(dirname
);
906 while ((de
= readdir(dir
)) != NULL
) {
913 if (de
->d_name
[0] == '.')
915 strcpy(dirname
+l
, "/");
916 strcat(dirname
+l
, de
->d_name
);
917 n
= readlink(dirname
, buf
, sizeof(buf
)-1);
921 sl
= strrchr(buf
, '/');
926 if (strcmp(devnm
, sl
) == 0)
935 int sysfs_freeze_array(struct mdinfo
*sra
)
937 /* Try to freeze resync/rebuild on this array/container.
938 * Return -1 if the array is busy,
939 * return 0 if this kernel doesn't support 'frozen'
940 * return 1 if it worked.
944 if (!sysfs_attribute_available(sra
, NULL
, "sync_action"))
945 return 1; /* no sync_action == frozen */
946 if (sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) <= 0)
948 if (strcmp(buf
, "frozen\n") == 0)
951 if (strcmp(buf
, "idle\n") != 0 && strcmp(buf
, "recover\n") != 0)
953 if (sysfs_set_str(sra
, NULL
, "sync_action", "frozen") < 0)
958 int sysfs_wait(int fd
, int *msec
)
960 /* Wait up to '*msec' for fd to have an exception condition.
961 * if msec == NULL, wait indefinitely.
968 n
= select(fd
+1, NULL
, NULL
, &fds
, NULL
);
972 struct timeval start
, end
, tv
;
973 gettimeofday(&start
, NULL
);
976 tv
.tv_usec
= (*msec
)*1000;
978 tv
.tv_sec
= (*msec
)/1000;
981 n
= select(fd
+1, NULL
, NULL
, &fds
, &tv
);
982 gettimeofday(&end
, NULL
);
983 end
.tv_sec
-= start
.tv_sec
;
984 *msec
-= (end
.tv_sec
* 1000 + end
.tv_usec
/1000
985 - start
.tv_usec
/1000) + 1;