]>
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) 2006-2009 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
)
92 if (ioctl(fd
, RAID_VERSION
, &vers
) != 0)
98 strcpy(mdi
->sys_name
, devnm
);
101 struct mdinfo
*sysfs_read(int fd
, char *devnm
, unsigned long options
)
103 char fname
[PATH_MAX
];
108 struct mdinfo
*dev
, **devp
;
112 sra
= xcalloc(1, sizeof(*sra
));
113 sysfs_init(sra
, fd
, devnm
);
114 if (sra
->sys_name
[0] == 0) {
119 sprintf(fname
, "/sys/block/%s/md/", sra
->sys_name
);
120 base
= fname
+ strlen(fname
);
123 if (options
& GET_VERSION
) {
124 strcpy(base
, "metadata_version");
125 if (load_sys(fname
, buf
, sizeof(buf
)))
127 if (strncmp(buf
, "none", 4) == 0) {
128 sra
->array
.major_version
=
129 sra
->array
.minor_version
= -1;
130 strcpy(sra
->text_version
, "");
131 } else if (strncmp(buf
, "external:", 9) == 0) {
132 sra
->array
.major_version
= -1;
133 sra
->array
.minor_version
= -2;
134 strcpy(sra
->text_version
, buf
+9);
137 &sra
->array
.major_version
,
138 &sra
->array
.minor_version
);
139 strcpy(sra
->text_version
, buf
);
142 if (options
& GET_LEVEL
) {
143 strcpy(base
, "level");
144 if (load_sys(fname
, buf
, sizeof(buf
)))
146 sra
->array
.level
= map_name(pers
, buf
);
148 if (options
& GET_LAYOUT
) {
149 strcpy(base
, "layout");
150 if (load_sys(fname
, buf
, sizeof(buf
)))
152 sra
->array
.layout
= strtoul(buf
, NULL
, 0);
154 if (options
& GET_DISKS
) {
155 strcpy(base
, "raid_disks");
156 if (load_sys(fname
, buf
, sizeof(buf
)))
158 sra
->array
.raid_disks
= strtoul(buf
, NULL
, 0);
160 if (options
& GET_DEGRADED
) {
161 strcpy(base
, "degraded");
162 if (load_sys(fname
, buf
, sizeof(buf
)))
164 sra
->array
.failed_disks
= strtoul(buf
, NULL
, 0);
166 if (options
& GET_COMPONENT
) {
167 strcpy(base
, "component_size");
168 if (load_sys(fname
, buf
, sizeof(buf
)))
170 sra
->component_size
= strtoull(buf
, NULL
, 0);
171 /* sysfs reports "K", but we want sectors */
172 sra
->component_size
*= 2;
174 if (options
& GET_CHUNK
) {
175 strcpy(base
, "chunk_size");
176 if (load_sys(fname
, buf
, sizeof(buf
)))
178 sra
->array
.chunk_size
= strtoul(buf
, NULL
, 0);
180 if (options
& GET_CACHE
) {
181 strcpy(base
, "stripe_cache_size");
182 if (load_sys(fname
, buf
, sizeof(buf
)))
183 /* Probably level doesn't support it */
186 sra
->cache_size
= strtoul(buf
, NULL
, 0);
188 if (options
& GET_MISMATCH
) {
189 strcpy(base
, "mismatch_cnt");
190 if (load_sys(fname
, buf
, sizeof(buf
)))
192 sra
->mismatch_cnt
= strtoul(buf
, NULL
, 0);
194 if (options
& GET_SAFEMODE
) {
201 strcpy(base
, "safe_mode_delay");
202 if (load_sys(fname
, buf
, sizeof(buf
)))
205 /* remove a period, and count digits after it */
207 for (i
= 0; i
< len
; i
++) {
209 if (isdigit(buf
[i
])) {
214 } else if (buf
[i
] == '.') {
219 msec
= strtoul(buf
, NULL
, 10);
220 msec
= (msec
* 1000) / scale
;
221 sra
->safe_mode_delay
= msec
;
223 if (options
& GET_BITMAP_LOCATION
) {
224 strcpy(base
, "bitmap/location");
225 if (load_sys(fname
, buf
, sizeof(buf
)))
227 if (strncmp(buf
, "file", 4) == 0)
228 sra
->bitmap_offset
= 1;
229 else if (strncmp(buf
, "none", 4) == 0)
230 sra
->bitmap_offset
= 0;
231 else if (buf
[0] == '+')
232 sra
->bitmap_offset
= strtol(buf
+1, NULL
, 10);
237 if (options
& GET_ARRAY_STATE
) {
238 strcpy(base
, "array_state");
239 if (load_sys(fname
, sra
->sysfs_array_state
,
240 sizeof(sra
->sysfs_array_state
)))
243 sra
->sysfs_array_state
[0] = 0;
245 if (! (options
& GET_DEVS
))
248 /* Get all the devices as well */
250 dir
= opendir(fname
);
253 sra
->array
.spare_disks
= 0;
257 while ((de
= readdir(dir
)) != NULL
) {
259 if (de
->d_ino
== 0 ||
260 strncmp(de
->d_name
, "dev-", 4) != 0)
262 strcpy(base
, de
->d_name
);
263 dbase
= base
+ strlen(base
);
266 dev
= xcalloc(1, sizeof(*dev
));
268 /* Always get slot, major, minor */
269 strcpy(dbase
, "slot");
270 if (load_sys(fname
, buf
, sizeof(buf
))) {
271 /* hmm... unable to read 'slot' maybe the device
274 strcpy(dbase
, "block");
275 if (readlink(fname
, buf
, sizeof(buf
)) < 0 &&
276 errno
!= ENAMETOOLONG
) {
277 /* ...yup device is gone */
281 /* slot is unreadable but 'block' link
282 * still intact... something bad is happening
290 strcpy(dev
->sys_name
, de
->d_name
);
291 dev
->disk
.raid_disk
= strtoul(buf
, &ep
, 10);
292 if (*ep
) dev
->disk
.raid_disk
= -1;
294 strcpy(dbase
, "block/dev");
295 if (load_sys(fname
, buf
, sizeof(buf
))) {
296 /* assume this is a stale reference to a hot
302 sra
->array
.nr_disks
++;
303 sscanf(buf
, "%d:%d", &dev
->disk
.major
, &dev
->disk
.minor
);
305 /* special case check for block devices that can go 'offline' */
306 strcpy(dbase
, "block/device/state");
307 if (load_sys(fname
, buf
, sizeof(buf
)) == 0 &&
308 strncmp(buf
, "offline", 7) == 0) {
313 /* finally add this disk to the array */
318 if (options
& GET_OFFSET
) {
319 strcpy(dbase
, "offset");
320 if (load_sys(fname
, buf
, sizeof(buf
)))
322 dev
->data_offset
= strtoull(buf
, NULL
, 0);
323 strcpy(dbase
, "new_offset");
324 if (load_sys(fname
, buf
, sizeof(buf
)) == 0)
325 dev
->new_data_offset
= strtoull(buf
, NULL
, 0);
327 dev
->new_data_offset
= dev
->data_offset
;
329 if (options
& GET_SIZE
) {
330 strcpy(dbase
, "size");
331 if (load_sys(fname
, buf
, sizeof(buf
)))
333 dev
->component_size
= strtoull(buf
, NULL
, 0) * 2;
335 if (options
& GET_STATE
) {
337 strcpy(dbase
, "state");
338 if (load_sys(fname
, buf
, sizeof(buf
)))
340 if (strstr(buf
, "in_sync"))
341 dev
->disk
.state
|= (1<<MD_DISK_SYNC
);
342 if (strstr(buf
, "faulty"))
343 dev
->disk
.state
|= (1<<MD_DISK_FAULTY
);
344 if (dev
->disk
.state
== 0)
345 sra
->array
.spare_disks
++;
347 if (options
& GET_ERROR
) {
348 strcpy(buf
, "errors");
349 if (load_sys(fname
, buf
, sizeof(buf
)))
351 dev
->errors
= strtoul(buf
, NULL
, 0);
364 int sysfs_attr_match(const char *attr
, const char *str
)
366 /* See if attr, read from a sysfs file, matches
367 * str. They must either be the same, or attr can
368 * have a trailing newline or comma
370 while (*attr
&& *str
&& *attr
== *str
) {
375 if (*str
|| (*attr
&& *attr
!= ',' && *attr
!= '\n'))
380 int sysfs_match_word(const char *word
, char **list
)
383 for (n
=0; list
[n
]; n
++)
384 if (sysfs_attr_match(word
, list
[n
]))
389 unsigned long long get_component_size(int fd
)
391 /* Find out the component size of the array.
392 * We cannot trust GET_ARRAY_INFO ioctl as it's
393 * size field is only 32bits.
394 * So look in /sys/block/mdXXX/md/component_size
396 * This returns in units of sectors.
399 char fname
[MAX_SYSFS_PATH_LEN
];
403 if (major(stb
.st_rdev
) != (unsigned)get_mdp_major())
404 snprintf(fname
, MAX_SYSFS_PATH_LEN
,
405 "/sys/block/md%d/md/component_size",
406 (int)minor(stb
.st_rdev
));
408 snprintf(fname
, MAX_SYSFS_PATH_LEN
,
409 "/sys/block/md_d%d/md/component_size",
410 (int)minor(stb
.st_rdev
)>>MdpMinorShift
);
411 fd
= open(fname
, O_RDONLY
);
414 n
= read(fd
, fname
, sizeof(fname
));
416 if (n
< 0 || n
== sizeof(fname
))
419 return strtoull(fname
, NULL
, 10) * 2;
422 int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
423 char *name
, char *val
)
425 char fname
[MAX_SYSFS_PATH_LEN
];
429 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/%s/%s",
430 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
431 fd
= open(fname
, O_WRONLY
);
434 n
= write(fd
, val
, strlen(val
));
436 if (n
!= strlen(val
)) {
437 dprintf("failed to write '%s' to '%s' (%s)\n",
438 val
, fname
, strerror(errno
));
444 int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
445 char *name
, unsigned long long val
)
448 sprintf(valstr
, "%llu", val
);
449 return sysfs_set_str(sra
, dev
, name
, valstr
);
452 int sysfs_set_num_signed(struct mdinfo
*sra
, struct mdinfo
*dev
,
453 char *name
, long long val
)
456 sprintf(valstr
, "%lli", val
);
457 return sysfs_set_str(sra
, dev
, name
, valstr
);
460 int sysfs_uevent(struct mdinfo
*sra
, char *event
)
462 char fname
[MAX_SYSFS_PATH_LEN
];
466 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/uevent",
468 fd
= open(fname
, O_WRONLY
);
471 n
= write(fd
, event
, strlen(event
));
473 if (n
!= (int)strlen(event
)) {
474 dprintf("failed to write '%s' to '%s' (%s)\n",
475 event
, fname
, strerror(errno
));
481 int sysfs_attribute_available(struct mdinfo
*sra
, struct mdinfo
*dev
, char *name
)
483 char fname
[MAX_SYSFS_PATH_LEN
];
486 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/%s/%s",
487 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
489 return stat(fname
, &st
) == 0;
492 int sysfs_get_fd(struct mdinfo
*sra
, struct mdinfo
*dev
,
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
);
500 fd
= open(fname
, O_RDWR
);
502 fd
= open(fname
, O_RDONLY
);
506 int sysfs_fd_get_ll(int fd
, unsigned long long *val
)
513 n
= read(fd
, buf
, sizeof(buf
));
514 if (n
<= 0 || n
== sizeof(buf
))
517 *val
= strtoull(buf
, &ep
, 0);
518 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))
523 int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
524 char *name
, unsigned long long *val
)
529 fd
= sysfs_get_fd(sra
, dev
, name
);
532 n
= sysfs_fd_get_ll(fd
, val
);
537 int sysfs_fd_get_two(int fd
, unsigned long long *v1
, unsigned long long *v2
)
539 /* two numbers in this sysfs file, either
549 n
= read(fd
, buf
, sizeof(buf
));
550 if (n
<= 0 || n
== sizeof(buf
))
553 *v1
= strtoull(buf
, &ep
, 0);
554 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))
556 while (*ep
== ' ' || *ep
== '/' || *ep
== '(')
558 *v2
= strtoull(ep
, &ep2
, 0);
559 if (ep2
== ep
|| (*ep2
!= 0 && *ep2
!= '\n' && *ep2
!= ' ' && *ep2
!= ')')) {
566 int sysfs_get_two(struct mdinfo
*sra
, struct mdinfo
*dev
,
567 char *name
, unsigned long long *v1
, unsigned long long *v2
)
572 fd
= sysfs_get_fd(sra
, dev
, name
);
575 n
= sysfs_fd_get_two(fd
, v1
, v2
);
580 int sysfs_fd_get_str(int fd
, char *val
, int size
)
585 n
= read(fd
, val
, size
);
586 if (n
<= 0 || n
== size
)
592 int sysfs_get_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
593 char *name
, char *val
, int size
)
598 fd
= sysfs_get_fd(sra
, dev
, name
);
601 n
= sysfs_fd_get_str(fd
, val
, size
);
606 int sysfs_set_safemode(struct mdinfo
*sra
, unsigned long ms
)
615 sprintf(delay
, "%ld.%03ld\n", sec
, msec
);
616 /* this '\n' ^ needed for kernels older than 2.6.28 */
617 return sysfs_set_str(sra
, NULL
, "safe_mode_delay", delay
);
620 int sysfs_set_array(struct mdinfo
*info
, int vers
)
624 int raid_disks
= info
->array
.raid_disks
;
627 if (info
->array
.major_version
== -1 &&
628 info
->array
.minor_version
== -2) {
631 strcat(strcpy(ver
, "external:"), info
->text_version
);
633 /* meta version might already be set if we are setting
634 * new geometry for a reshape. In that case we don't
635 * want to over-write the 'readonly' flag that is
636 * stored in the metadata version. So read the current
637 * version first, and preserve the flag
639 if (sysfs_get_str(info
, NULL
, "metadata_version",
641 if (strlen(buf
) >= 9 && buf
[9] == '-')
644 if ((vers
% 100) < 2 ||
645 sysfs_set_str(info
, NULL
, "metadata_version",
647 pr_err("This kernel does not support external metadata.\n");
651 if (info
->array
.level
< 0)
652 return 0; /* FIXME */
653 rv
|= sysfs_set_str(info
, NULL
, "level",
654 map_num(pers
, info
->array
.level
));
655 if (info
->reshape_active
&& info
->delta_disks
!= UnSet
)
656 raid_disks
-= info
->delta_disks
;
657 rv
|= sysfs_set_num(info
, NULL
, "raid_disks", raid_disks
);
658 rv
|= sysfs_set_num(info
, NULL
, "chunk_size", info
->array
.chunk_size
);
659 rv
|= sysfs_set_num(info
, NULL
, "layout", info
->array
.layout
);
660 rv
|= sysfs_set_num(info
, NULL
, "component_size", info
->component_size
/2);
661 if (info
->custom_array_size
) {
664 rc
= sysfs_set_num(info
, NULL
, "array_size",
665 info
->custom_array_size
/2);
666 if (rc
&& errno
== ENOENT
) {
667 pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n");
673 if (info
->array
.level
> 0)
674 rv
|= sysfs_set_num(info
, NULL
, "resync_start", info
->resync_start
);
676 if (info
->reshape_active
) {
677 rv
|= sysfs_set_num(info
, NULL
, "reshape_position",
678 info
->reshape_progress
);
679 rv
|= sysfs_set_num(info
, NULL
, "chunk_size", info
->new_chunk
);
680 rv
|= sysfs_set_num(info
, NULL
, "layout", info
->new_layout
);
681 rv
|= sysfs_set_num(info
, NULL
, "raid_disks",
682 info
->array
.raid_disks
);
683 /* We don't set 'new_level' here. That can only happen
684 * once the reshape completes.
690 int sysfs_add_disk(struct mdinfo
*sra
, struct mdinfo
*sd
, int resume
)
698 sprintf(dv
, "%d:%d", sd
->disk
.major
, sd
->disk
.minor
);
699 rv
= sysfs_set_str(sra
, NULL
, "new_dev", dv
);
703 memset(nm
, 0, sizeof(nm
));
704 dname
= devid2kname(makedev(sd
->disk
.major
, sd
->disk
.minor
));
705 strcpy(sd
->sys_name
, "dev-");
706 strcpy(sd
->sys_name
+4, dname
);
708 /* test write to see if 'recovery_start' is available */
709 if (resume
&& sd
->recovery_start
< MaxSector
&&
710 sysfs_set_num(sra
, sd
, "recovery_start", 0)) {
711 sysfs_set_str(sra
, sd
, "state", "remove");
715 rv
= sysfs_set_num(sra
, sd
, "offset", sd
->data_offset
);
716 rv
|= sysfs_set_num(sra
, sd
, "size", (sd
->component_size
+1) / 2);
717 if (sra
->array
.level
!= LEVEL_CONTAINER
) {
718 if (sd
->recovery_start
== MaxSector
)
719 /* This can correctly fail if array isn't started,
720 * yet, so just ignore status for now.
722 sysfs_set_str(sra
, sd
, "state", "insync");
723 if (sd
->disk
.raid_disk
>= 0)
724 rv
|= sysfs_set_num(sra
, sd
, "slot", sd
->disk
.raid_disk
);
726 sysfs_set_num(sra
, sd
, "recovery_start", sd
->recovery_start
);
728 if (sd
->bb
.supported
) {
729 if (sysfs_set_str(sra
, sd
, "state", "external_bbl")) {
731 * backward compatibility - if kernel doesn't support
732 * bad blocks for external metadata, let it continue
733 * as long as there are none known so far
736 pr_err("The kernel has no support for bad blocks in external metadata\n");
741 for (i
= 0; i
< sd
->bb
.count
; i
++) {
743 const struct md_bb_entry
*entry
= &sd
->bb
.entries
[i
];
745 snprintf(s
, sizeof(s
) - 1, "%llu %d\n", entry
->sector
,
747 rv
|= sysfs_set_str(sra
, sd
, "bad_blocks", s
);
754 int sysfs_disk_to_sg(int fd
)
756 /* from an open block device, try find and open its corresponding
757 * scsi_generic interface
762 char sg_major_minor
[10];
766 int major
, minor
, rv
;
771 snprintf(path
, sizeof(path
), "/sys/dev/block/%d:%d/device",
772 major(st
.st_rdev
), minor(st
.st_rdev
));
780 if (strncmp("scsi_generic:", de
->d_name
,
781 strlen("scsi_generic:")) == 0)
790 snprintf(sg_path
, sizeof(sg_path
), "%s/%s/dev", path
, de
->d_name
);
791 fd
= open(sg_path
, O_RDONLY
);
795 rv
= read(fd
, sg_major_minor
, sizeof(sg_major_minor
));
797 if (rv
< 0 || rv
== sizeof(sg_major_minor
))
800 sg_major_minor
[rv
- 1] = '\0';
802 c
= strchr(sg_major_minor
, ':');
805 major
= strtol(sg_major_minor
, NULL
, 10);
806 minor
= strtol(c
, NULL
, 10);
807 snprintf(path
, sizeof(path
), "/dev/.tmp.md.%d:%d:%d",
808 (int) getpid(), major
, minor
);
809 if (mknod(path
, S_IFCHR
|0600, makedev(major
, minor
))==0) {
810 fd
= open(path
, O_RDONLY
);
819 int sysfs_disk_to_scsi_id(int fd
, __u32
*id
)
821 /* from an open block device, try to retrieve it scsi_id */
826 int host
, bus
, target
, lun
;
831 snprintf(path
, sizeof(path
), "/sys/dev/block/%d:%d/device/scsi_device",
832 major(st
.st_rdev
), minor(st
.st_rdev
));
838 for (de
= readdir(dir
); de
; de
= readdir(dir
)) {
841 if (de
->d_type
!= DT_DIR
)
844 count
= sscanf(de
->d_name
, "%d:%d:%d:%d", &host
, &bus
, &target
, &lun
);
853 *id
= (host
<< 24) | (bus
<< 16) | (target
<< 8) | (lun
<< 0);
857 int sysfs_unique_holder(char *devnm
, long rdev
)
859 /* Check that devnm is a holder of rdev,
860 * and is the only holder.
861 * we should be locked against races by
864 * 0 - not unique, not even a holder
865 * 1 - unique, this is the only holder.
866 * 2/3 - not unique, there is another holder
867 * -1 - error, cannot find the holders
874 sprintf(dirname
, "/sys/dev/block/%d:%d/holders",
875 major(rdev
), minor(rdev
));
876 dir
= opendir(dirname
);
880 while ((de
= readdir(dir
)) != NULL
) {
887 if (de
->d_name
[0] == '.')
889 strcpy(dirname
+l
, "/");
890 strcat(dirname
+l
, de
->d_name
);
891 n
= readlink(dirname
, buf
, sizeof(buf
)-1);
895 sl
= strrchr(buf
, '/');
900 if (strcmp(devnm
, sl
) == 0)
909 int sysfs_freeze_array(struct mdinfo
*sra
)
911 /* Try to freeze resync/rebuild on this array/container.
912 * Return -1 if the array is busy,
913 * return 0 if this kernel doesn't support 'frozen'
914 * return 1 if it worked.
918 if (!sysfs_attribute_available(sra
, NULL
, "sync_action"))
919 return 1; /* no sync_action == frozen */
920 if (sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) <= 0)
922 if (strcmp(buf
, "frozen\n") == 0)
925 if (strcmp(buf
, "idle\n") != 0 && strcmp(buf
, "recover\n") != 0)
927 if (sysfs_set_str(sra
, NULL
, "sync_action", "frozen") < 0)
932 int sysfs_wait(int fd
, int *msec
)
934 /* Wait up to '*msec' for fd to have an exception condition.
935 * if msec == NULL, wait indefinitely.
942 n
= select(fd
+1, NULL
, NULL
, &fds
, NULL
);
946 struct timeval start
, end
, tv
;
947 gettimeofday(&start
, NULL
);
950 tv
.tv_usec
= (*msec
)*1000;
952 tv
.tv_sec
= (*msec
)/1000;
955 n
= select(fd
+1, NULL
, NULL
, &fds
, &tv
);
956 gettimeofday(&end
, NULL
);
957 end
.tv_sec
-= start
.tv_sec
;
958 *msec
-= (end
.tv_sec
* 1000 + end
.tv_usec
/1000
959 - start
.tv_usec
/1000) + 1;