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>
31 #define MAX_SYSFS_PATH_LEN 120
33 struct dev_sysfs_rule
{
34 struct dev_sysfs_rule
*next
;
39 struct sysfs_entry
*next
;
45 int load_sys(char *path
, char *buf
, int len
)
47 int fd
= open(path
, O_RDONLY
);
51 n
= read(fd
, buf
, len
);
56 if (n
&& buf
[n
-1] == '\n')
61 void sysfs_free(struct mdinfo
*sra
)
64 struct mdinfo
*sra2
= sra
->next
;
66 struct mdinfo
*d
= sra
->devs
;
71 free(sra
->bb
.entries
);
77 int sysfs_open(char *devnm
, char *devname
, char *attr
)
79 char fname
[MAX_SYSFS_PATH_LEN
];
82 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/", devnm
);
84 strncat(fname
, devname
, MAX_SYSFS_PATH_LEN
- strlen(fname
));
85 strncat(fname
, "/", MAX_SYSFS_PATH_LEN
- strlen(fname
));
87 strncat(fname
, attr
, MAX_SYSFS_PATH_LEN
- strlen(fname
));
88 fd
= open(fname
, O_RDWR
);
89 if (fd
< 0 && errno
== EACCES
)
90 fd
= open(fname
, O_RDONLY
);
94 void sysfs_init_dev(struct mdinfo
*mdi
, dev_t devid
)
96 snprintf(mdi
->sys_name
,
97 sizeof(mdi
->sys_name
), "dev-%s", devid2kname(devid
));
100 int sysfs_init(struct mdinfo
*mdi
, int fd
, char *devnm
)
103 char fname
[MAX_SYSFS_PATH_LEN
];
104 int retval
= -ENODEV
;
106 mdi
->sys_name
[0] = 0;
108 devnm
= fd2devnm(fd
);
113 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md", devnm
);
115 if (stat(fname
, &stb
))
117 if (!S_ISDIR(stb
.st_mode
))
119 strcpy(mdi
->sys_name
, devnm
);
126 struct mdinfo
*sysfs_read(int fd
, char *devnm
, unsigned long options
)
128 char fname
[PATH_MAX
];
133 struct mdinfo
*dev
, **devp
;
137 sra
= xcalloc(1, sizeof(*sra
));
138 if (sysfs_init(sra
, fd
, devnm
)) {
143 sprintf(fname
, "/sys/block/%s/md/", sra
->sys_name
);
144 base
= fname
+ strlen(fname
);
147 if (options
& GET_VERSION
) {
148 strcpy(base
, "metadata_version");
149 if (load_sys(fname
, buf
, sizeof(buf
)))
151 if (strncmp(buf
, "none", 4) == 0) {
152 sra
->array
.major_version
=
153 sra
->array
.minor_version
= -1;
154 strcpy(sra
->text_version
, "");
155 } else if (strncmp(buf
, "external:", 9) == 0) {
156 sra
->array
.major_version
= -1;
157 sra
->array
.minor_version
= -2;
158 strcpy(sra
->text_version
, buf
+9);
161 &sra
->array
.major_version
,
162 &sra
->array
.minor_version
);
163 strcpy(sra
->text_version
, buf
);
166 if (options
& GET_LEVEL
) {
167 strcpy(base
, "level");
168 if (load_sys(fname
, buf
, sizeof(buf
)))
170 sra
->array
.level
= map_name(pers
, buf
);
172 if (options
& GET_LAYOUT
) {
173 strcpy(base
, "layout");
174 if (load_sys(fname
, buf
, sizeof(buf
)))
176 sra
->array
.layout
= strtoul(buf
, NULL
, 0);
178 if (options
& (GET_DISKS
|GET_STATE
)) {
179 strcpy(base
, "raid_disks");
180 if (load_sys(fname
, buf
, sizeof(buf
)))
182 sra
->array
.raid_disks
= strtoul(buf
, NULL
, 0);
184 if (options
& GET_COMPONENT
) {
185 strcpy(base
, "component_size");
186 if (load_sys(fname
, buf
, sizeof(buf
)))
188 sra
->component_size
= strtoull(buf
, NULL
, 0);
189 /* sysfs reports "K", but we want sectors */
190 sra
->component_size
*= 2;
192 if (options
& GET_CHUNK
) {
193 strcpy(base
, "chunk_size");
194 if (load_sys(fname
, buf
, sizeof(buf
)))
196 sra
->array
.chunk_size
= strtoul(buf
, NULL
, 0);
198 if (options
& GET_CACHE
) {
199 strcpy(base
, "stripe_cache_size");
200 if (load_sys(fname
, buf
, sizeof(buf
)))
201 /* Probably level doesn't support it */
204 sra
->cache_size
= strtoul(buf
, NULL
, 0);
206 if (options
& GET_MISMATCH
) {
207 strcpy(base
, "mismatch_cnt");
208 if (load_sys(fname
, buf
, sizeof(buf
)))
210 sra
->mismatch_cnt
= strtoul(buf
, NULL
, 0);
212 if (options
& GET_SAFEMODE
) {
219 strcpy(base
, "safe_mode_delay");
220 if (load_sys(fname
, buf
, sizeof(buf
)))
223 /* remove a period, and count digits after it */
225 for (i
= 0; i
< len
; i
++) {
227 if (isdigit(buf
[i
])) {
232 } else if (buf
[i
] == '.') {
237 msec
= strtoul(buf
, NULL
, 10);
238 msec
= (msec
* 1000) / scale
;
239 sra
->safe_mode_delay
= msec
;
241 if (options
& GET_BITMAP_LOCATION
) {
242 strcpy(base
, "bitmap/location");
243 if (load_sys(fname
, buf
, sizeof(buf
)))
245 if (strncmp(buf
, "file", 4) == 0)
246 sra
->bitmap_offset
= 1;
247 else if (strncmp(buf
, "none", 4) == 0)
248 sra
->bitmap_offset
= 0;
249 else if (buf
[0] == '+')
250 sra
->bitmap_offset
= strtol(buf
+1, NULL
, 10);
255 if (options
& GET_ARRAY_STATE
) {
256 strcpy(base
, "array_state");
257 if (load_sys(fname
, buf
, sizeof(buf
)))
259 sra
->array_state
= map_name(sysfs_array_states
, buf
);
262 if (options
& GET_CONSISTENCY_POLICY
) {
263 strcpy(base
, "consistency_policy");
264 if (load_sys(fname
, buf
, sizeof(buf
)))
265 sra
->consistency_policy
= CONSISTENCY_POLICY_UNKNOWN
;
267 sra
->consistency_policy
= map_name(consistency_policies
,
271 if (! (options
& GET_DEVS
))
274 /* Get all the devices as well */
276 dir
= opendir(fname
);
279 sra
->array
.spare_disks
= 0;
280 sra
->array
.active_disks
= 0;
281 sra
->array
.failed_disks
= 0;
282 sra
->array
.working_disks
= 0;
286 while ((de
= readdir(dir
)) != NULL
) {
288 if (de
->d_ino
== 0 ||
289 strncmp(de
->d_name
, "dev-", 4) != 0)
291 strcpy(base
, de
->d_name
);
292 dbase
= base
+ strlen(base
);
295 dev
= xcalloc(1, sizeof(*dev
));
297 /* Always get slot, major, minor */
298 strcpy(dbase
, "slot");
299 if (load_sys(fname
, buf
, sizeof(buf
))) {
300 /* hmm... unable to read 'slot' maybe the device
303 strcpy(dbase
, "block");
304 if (readlink(fname
, buf
, sizeof(buf
)) < 0 &&
305 errno
!= ENAMETOOLONG
) {
306 /* ...yup device is gone */
310 /* slot is unreadable but 'block' link
311 * still intact... something bad is happening
319 strcpy(dev
->sys_name
, de
->d_name
);
320 dev
->disk
.raid_disk
= strtoul(buf
, &ep
, 10);
321 if (*ep
) dev
->disk
.raid_disk
= -1;
323 sra
->array
.nr_disks
++;
324 strcpy(dbase
, "block/dev");
325 if (load_sys(fname
, buf
, sizeof(buf
))) {
326 /* assume this is a stale reference to a hot
329 if (!(options
& GET_DEVS_ALL
)) {
334 sscanf(buf
, "%d:%d", &dev
->disk
.major
, &dev
->disk
.minor
);
337 if (!(options
& GET_DEVS_ALL
)) {
338 /* special case check for block devices that can go 'offline' */
339 strcpy(dbase
, "block/device/state");
340 if (load_sys(fname
, buf
, sizeof(buf
)) == 0 &&
341 strncmp(buf
, "offline", 7) == 0) {
347 /* finally add this disk to the array */
352 if (options
& GET_OFFSET
) {
353 strcpy(dbase
, "offset");
354 if (load_sys(fname
, buf
, sizeof(buf
)))
356 dev
->data_offset
= strtoull(buf
, NULL
, 0);
357 strcpy(dbase
, "new_offset");
358 if (load_sys(fname
, buf
, sizeof(buf
)) == 0)
359 dev
->new_data_offset
= strtoull(buf
, NULL
, 0);
361 dev
->new_data_offset
= dev
->data_offset
;
363 if (options
& GET_SIZE
) {
364 strcpy(dbase
, "size");
365 if (load_sys(fname
, buf
, sizeof(buf
)))
367 dev
->component_size
= strtoull(buf
, NULL
, 0) * 2;
369 if (options
& GET_STATE
) {
371 strcpy(dbase
, "state");
372 if (load_sys(fname
, buf
, sizeof(buf
)))
374 if (strstr(buf
, "faulty"))
375 dev
->disk
.state
|= (1<<MD_DISK_FAULTY
);
377 sra
->array
.working_disks
++;
378 if (strstr(buf
, "in_sync")) {
379 dev
->disk
.state
|= (1<<MD_DISK_SYNC
);
380 sra
->array
.active_disks
++;
382 if (dev
->disk
.state
== 0)
383 sra
->array
.spare_disks
++;
386 if (options
& GET_ERROR
) {
387 strcpy(buf
, "errors");
388 if (load_sys(fname
, buf
, sizeof(buf
)))
390 dev
->errors
= strtoul(buf
, NULL
, 0);
394 if ((options
& GET_STATE
) && sra
->array
.raid_disks
)
395 sra
->array
.failed_disks
= sra
->array
.raid_disks
-
396 sra
->array
.active_disks
- sra
->array
.spare_disks
;
408 int sysfs_attr_match(const char *attr
, const char *str
)
410 /* See if attr, read from a sysfs file, matches
411 * str. They must either be the same, or attr can
412 * have a trailing newline or comma
414 while (*attr
&& *str
&& *attr
== *str
) {
419 if (*str
|| (*attr
&& *attr
!= ',' && *attr
!= '\n'))
424 int sysfs_match_word(const char *word
, char **list
)
427 for (n
=0; list
[n
]; n
++)
428 if (sysfs_attr_match(word
, list
[n
]))
433 unsigned long long get_component_size(int fd
)
435 /* Find out the component size of the array.
436 * We cannot trust GET_ARRAY_INFO ioctl as it's
437 * size field is only 32bits.
438 * So look in /sys/block/mdXXX/md/component_size
440 * This returns in units of sectors.
443 char fname
[MAX_SYSFS_PATH_LEN
];
447 snprintf(fname
, MAX_SYSFS_PATH_LEN
,
448 "/sys/block/%s/md/component_size", stat2devnm(&stb
));
449 fd
= open(fname
, O_RDONLY
);
452 n
= read(fd
, fname
, sizeof(fname
));
454 if (n
< 0 || n
== sizeof(fname
))
457 return strtoull(fname
, NULL
, 10) * 2;
460 int sysfs_set_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
461 char *name
, char *val
)
463 char fname
[MAX_SYSFS_PATH_LEN
];
467 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/%s/%s",
468 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
469 fd
= open(fname
, O_WRONLY
);
472 n
= write(fd
, val
, strlen(val
));
474 if (n
!= strlen(val
)) {
475 dprintf("failed to write '%s' to '%s' (%s)\n",
476 val
, fname
, strerror(errno
));
482 int sysfs_set_num(struct mdinfo
*sra
, struct mdinfo
*dev
,
483 char *name
, unsigned long long val
)
486 sprintf(valstr
, "%llu", val
);
487 return sysfs_set_str(sra
, dev
, name
, valstr
);
490 int sysfs_set_num_signed(struct mdinfo
*sra
, struct mdinfo
*dev
,
491 char *name
, long long val
)
494 sprintf(valstr
, "%lli", val
);
495 return sysfs_set_str(sra
, dev
, name
, valstr
);
498 int sysfs_uevent(struct mdinfo
*sra
, char *event
)
500 char fname
[MAX_SYSFS_PATH_LEN
];
504 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/uevent",
506 fd
= open(fname
, O_WRONLY
);
509 n
= write(fd
, event
, strlen(event
));
511 if (n
!= (int)strlen(event
)) {
512 dprintf("failed to write '%s' to '%s' (%s)\n",
513 event
, fname
, strerror(errno
));
519 int sysfs_attribute_available(struct mdinfo
*sra
, struct mdinfo
*dev
, char *name
)
521 char fname
[MAX_SYSFS_PATH_LEN
];
524 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/%s/%s",
525 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
527 return stat(fname
, &st
) == 0;
530 int sysfs_get_fd(struct mdinfo
*sra
, struct mdinfo
*dev
,
533 char fname
[MAX_SYSFS_PATH_LEN
];
536 snprintf(fname
, MAX_SYSFS_PATH_LEN
, "/sys/block/%s/md/%s/%s",
537 sra
->sys_name
, dev
?dev
->sys_name
:"", name
);
538 fd
= open(fname
, O_RDWR
);
540 fd
= open(fname
, O_RDONLY
);
544 int sysfs_fd_get_ll(int fd
, unsigned long long *val
)
551 n
= read(fd
, buf
, sizeof(buf
));
552 if (n
<= 0 || n
== sizeof(buf
))
555 *val
= strtoull(buf
, &ep
, 0);
556 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))
561 int sysfs_get_ll(struct mdinfo
*sra
, struct mdinfo
*dev
,
562 char *name
, unsigned long long *val
)
567 fd
= sysfs_get_fd(sra
, dev
, name
);
570 n
= sysfs_fd_get_ll(fd
, val
);
575 int sysfs_fd_get_two(int fd
, unsigned long long *v1
, unsigned long long *v2
)
577 /* two numbers in this sysfs file, either
587 n
= read(fd
, buf
, sizeof(buf
));
588 if (n
<= 0 || n
== sizeof(buf
))
591 *v1
= strtoull(buf
, &ep
, 0);
592 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n' && *ep
!= ' '))
594 while (*ep
== ' ' || *ep
== '/' || *ep
== '(')
596 *v2
= strtoull(ep
, &ep2
, 0);
597 if (ep2
== ep
|| (*ep2
!= 0 && *ep2
!= '\n' && *ep2
!= ' ' && *ep2
!= ')')) {
604 int sysfs_get_two(struct mdinfo
*sra
, struct mdinfo
*dev
,
605 char *name
, unsigned long long *v1
, unsigned long long *v2
)
610 fd
= sysfs_get_fd(sra
, dev
, name
);
613 n
= sysfs_fd_get_two(fd
, v1
, v2
);
618 int sysfs_fd_get_str(int fd
, char *val
, int size
)
623 n
= read(fd
, val
, size
);
624 if (n
<= 0 || n
== size
)
630 int sysfs_get_str(struct mdinfo
*sra
, struct mdinfo
*dev
,
631 char *name
, char *val
, int size
)
636 fd
= sysfs_get_fd(sra
, dev
, name
);
639 n
= sysfs_fd_get_str(fd
, val
, size
);
644 int sysfs_set_safemode(struct mdinfo
*sra
, unsigned long ms
)
653 sprintf(delay
, "%ld.%03ld\n", sec
, msec
);
654 /* this '\n' ^ needed for kernels older than 2.6.28 */
655 return sysfs_set_str(sra
, NULL
, "safe_mode_delay", delay
);
658 int sysfs_set_array(struct mdinfo
*info
, int vers
)
662 int raid_disks
= info
->array
.raid_disks
;
665 if (info
->array
.major_version
== -1 &&
666 info
->array
.minor_version
== -2) {
669 strcat(strcpy(ver
, "external:"), info
->text_version
);
671 /* meta version might already be set if we are setting
672 * new geometry for a reshape. In that case we don't
673 * want to over-write the 'readonly' flag that is
674 * stored in the metadata version. So read the current
675 * version first, and preserve the flag
677 if (sysfs_get_str(info
, NULL
, "metadata_version",
679 if (strlen(buf
) >= 9 && buf
[9] == '-')
682 if ((vers
% 100) < 2 ||
683 sysfs_set_str(info
, NULL
, "metadata_version",
685 pr_err("This kernel does not support external metadata.\n");
689 if (info
->array
.level
< 0)
690 return 0; /* FIXME */
691 rv
|= sysfs_set_str(info
, NULL
, "level",
692 map_num_s(pers
, info
->array
.level
));
693 if (info
->reshape_active
&& info
->delta_disks
!= UnSet
)
694 raid_disks
-= info
->delta_disks
;
695 rv
|= sysfs_set_num(info
, NULL
, "raid_disks", raid_disks
);
696 rv
|= sysfs_set_num(info
, NULL
, "chunk_size", info
->array
.chunk_size
);
697 rv
|= sysfs_set_num(info
, NULL
, "layout", info
->array
.layout
);
698 rv
|= sysfs_set_num(info
, NULL
, "component_size", info
->component_size
/2);
699 if (info
->custom_array_size
) {
702 rc
= sysfs_set_num(info
, NULL
, "array_size",
703 info
->custom_array_size
/2);
704 if (rc
&& errno
== ENOENT
) {
705 pr_err("This kernel does not have the md/array_size attribute, the array may be larger than expected\n");
711 if (info
->array
.level
> 0)
712 rv
|= sysfs_set_num(info
, NULL
, "resync_start", info
->resync_start
);
714 if (info
->reshape_active
) {
715 rv
|= sysfs_set_num(info
, NULL
, "reshape_position",
716 info
->reshape_progress
);
717 rv
|= sysfs_set_num(info
, NULL
, "chunk_size", info
->new_chunk
);
718 rv
|= sysfs_set_num(info
, NULL
, "layout", info
->new_layout
);
719 rv
|= sysfs_set_num(info
, NULL
, "raid_disks",
720 info
->array
.raid_disks
);
721 /* We don't set 'new_level' here. That can only happen
722 * once the reshape completes.
726 if (info
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
727 char *policy
= map_num_s(consistency_policies
,
728 info
->consistency_policy
);
730 if (sysfs_set_str(info
, NULL
, "consistency_policy", policy
)) {
731 pr_err("This kernel does not support PPL. Falling back to consistency-policy=resync.\n");
732 info
->consistency_policy
= CONSISTENCY_POLICY_RESYNC
;
739 int sysfs_add_disk(struct mdinfo
*sra
, struct mdinfo
*sd
, int resume
)
747 sprintf(dv
, "%d:%d", sd
->disk
.major
, sd
->disk
.minor
);
748 rv
= sysfs_set_str(sra
, NULL
, "new_dev", dv
);
752 memset(nm
, 0, sizeof(nm
));
753 dname
= devid2kname(makedev(sd
->disk
.major
, sd
->disk
.minor
));
754 strcpy(sd
->sys_name
, "dev-");
755 strcpy(sd
->sys_name
+4, dname
);
757 /* test write to see if 'recovery_start' is available */
758 if (resume
&& sd
->recovery_start
< MaxSector
&&
759 sysfs_set_num(sra
, sd
, "recovery_start", 0)) {
760 sysfs_set_str(sra
, sd
, "state", "remove");
764 rv
= sysfs_set_num(sra
, sd
, "offset", sd
->data_offset
);
765 rv
|= sysfs_set_num(sra
, sd
, "size", (sd
->component_size
+1) / 2);
766 if (!is_container(sra
->array
.level
)) {
767 if (sra
->consistency_policy
== CONSISTENCY_POLICY_PPL
) {
768 rv
|= sysfs_set_num(sra
, sd
, "ppl_sector", sd
->ppl_sector
);
769 rv
|= sysfs_set_num(sra
, sd
, "ppl_size", sd
->ppl_size
);
771 if (sd
->recovery_start
== MaxSector
)
772 /* This can correctly fail if array isn't started,
773 * yet, so just ignore status for now.
775 sysfs_set_str(sra
, sd
, "state", "insync");
776 if (sd
->disk
.raid_disk
>= 0)
777 rv
|= sysfs_set_num(sra
, sd
, "slot", sd
->disk
.raid_disk
);
779 sysfs_set_num(sra
, sd
, "recovery_start", sd
->recovery_start
);
781 if (sd
->bb
.supported
) {
782 if (sysfs_set_str(sra
, sd
, "state", "external_bbl")) {
784 * backward compatibility - if kernel doesn't support
785 * bad blocks for external metadata, let it continue
786 * as long as there are none known so far
789 pr_err("The kernel has no support for bad blocks in external metadata\n");
794 for (i
= 0; i
< sd
->bb
.count
; i
++) {
796 const struct md_bb_entry
*entry
= &sd
->bb
.entries
[i
];
798 snprintf(s
, sizeof(s
) - 1, "%llu %d\n", entry
->sector
,
800 rv
|= sysfs_set_str(sra
, sd
, "bad_blocks", s
);
807 int sysfs_disk_to_sg(int fd
)
809 /* from an open block device, try find and open its corresponding
810 * scsi_generic interface
815 char sg_major_minor
[10];
819 int major
, minor
, rv
;
824 snprintf(path
, sizeof(path
), "/sys/dev/block/%d:%d/device",
825 major(st
.st_rdev
), minor(st
.st_rdev
));
833 if (strncmp("scsi_generic:", de
->d_name
,
834 strlen("scsi_generic:")) == 0)
843 snprintf(sg_path
, sizeof(sg_path
), "%s/%s/dev", path
, de
->d_name
);
844 fd
= open(sg_path
, O_RDONLY
);
848 rv
= read(fd
, sg_major_minor
, sizeof(sg_major_minor
));
850 if (rv
< 0 || rv
== sizeof(sg_major_minor
))
853 sg_major_minor
[rv
- 1] = '\0';
855 c
= strchr(sg_major_minor
, ':');
858 major
= strtol(sg_major_minor
, NULL
, 10);
859 minor
= strtol(c
, NULL
, 10);
860 snprintf(path
, sizeof(path
), "/dev/.tmp.md.%d:%d:%d",
861 (int) getpid(), major
, minor
);
862 if (mknod(path
, S_IFCHR
|0600, makedev(major
, minor
))==0) {
863 fd
= open(path
, O_RDONLY
);
872 int sysfs_disk_to_scsi_id(int fd
, __u32
*id
)
874 /* from an open block device, try to retrieve it scsi_id */
879 int host
, bus
, target
, lun
;
884 snprintf(path
, sizeof(path
), "/sys/dev/block/%d:%d/device/scsi_device",
885 major(st
.st_rdev
), minor(st
.st_rdev
));
891 for (de
= readdir(dir
); de
; de
= readdir(dir
)) {
894 if (de
->d_type
!= DT_DIR
)
897 count
= sscanf(de
->d_name
, "%d:%d:%d:%d", &host
, &bus
, &target
, &lun
);
906 *id
= (host
<< 24) | (bus
<< 16) | (target
<< 8) | (lun
<< 0);
910 int sysfs_unique_holder(char *devnm
, long rdev
)
912 /* Check that devnm is a holder of rdev,
913 * and is the only holder.
914 * we should be locked against races by
917 * 0 - not unique, not even a holder
918 * 1 - unique, this is the only holder.
919 * 2/3 - not unique, there is another holder
920 * -1 - error, cannot find the holders
927 sprintf(dirname
, "/sys/dev/block/%d:%d/holders",
928 major(rdev
), minor(rdev
));
929 dir
= opendir(dirname
);
933 while ((de
= readdir(dir
)) != NULL
) {
940 if (de
->d_name
[0] == '.')
942 strcpy(dirname
+l
, "/");
943 strcat(dirname
+l
, de
->d_name
);
944 n
= readlink(dirname
, buf
, sizeof(buf
)-1);
948 sl
= strrchr(buf
, '/');
953 if (strcmp(devnm
, sl
) == 0)
962 int sysfs_freeze_array(struct mdinfo
*sra
)
964 /* Try to freeze resync/rebuild on this array/container.
965 * Return -1 if the array is busy,
966 * return 0 if this kernel doesn't support 'frozen'
967 * return 1 if it worked.
971 if (!sysfs_attribute_available(sra
, NULL
, "sync_action"))
972 return 1; /* no sync_action == frozen */
973 if (sysfs_get_str(sra
, NULL
, "sync_action", buf
, 20) <= 0)
975 if (strcmp(buf
, "frozen\n") == 0)
978 if (strcmp(buf
, "idle\n") != 0 && strcmp(buf
, "recover\n") != 0)
980 if (sysfs_set_str(sra
, NULL
, "sync_action", "frozen") < 0)
985 int sysfs_wait(int fd
, int *msec
)
987 /* Wait up to '*msec' for fd to have an exception condition.
988 * if msec == NULL, wait indefinitely.
995 n
= select(fd
+1, NULL
, NULL
, &fds
, NULL
);
999 struct timeval start
, end
, tv
;
1000 gettimeofday(&start
, NULL
);
1003 tv
.tv_usec
= (*msec
)*1000;
1005 tv
.tv_sec
= (*msec
)/1000;
1008 n
= select(fd
+1, NULL
, NULL
, &fds
, &tv
);
1009 gettimeofday(&end
, NULL
);
1010 end
.tv_sec
-= start
.tv_sec
;
1011 *msec
-= (end
.tv_sec
* 1000 + end
.tv_usec
/1000
1012 - start
.tv_usec
/1000) + 1;
1017 int sysfs_rules_apply_check(const struct mdinfo
*sra
,
1018 const struct sysfs_entry
*ent
)
1020 /* Check whether parameter is regular file,
1021 * exists and is under specified directory.
1023 char fname
[MAX_SYSFS_PATH_LEN
];
1024 char dname
[MAX_SYSFS_PATH_LEN
];
1025 char resolved_path
[PATH_MAX
];
1026 char resolved_dir
[PATH_MAX
];
1029 if (sra
== NULL
|| ent
== NULL
)
1032 result
= snprintf(dname
, MAX_SYSFS_PATH_LEN
,
1033 "/sys/block/%s/md/", sra
->sys_name
);
1034 if (result
< 0 || result
>= MAX_SYSFS_PATH_LEN
)
1037 result
= snprintf(fname
, MAX_SYSFS_PATH_LEN
,
1038 "%s/%s", dname
, ent
->name
);
1039 if (result
< 0 || result
>= MAX_SYSFS_PATH_LEN
)
1042 if (realpath(fname
, resolved_path
) == NULL
||
1043 realpath(dname
, resolved_dir
) == NULL
)
1046 if (strncmp(resolved_dir
, resolved_path
,
1047 strnlen(resolved_dir
, PATH_MAX
)) != 0)
1053 static struct dev_sysfs_rule
*sysfs_rules
;
1055 void sysfs_rules_apply(char *devnm
, struct mdinfo
*dev
)
1057 struct dev_sysfs_rule
*rules
= sysfs_rules
;
1060 struct sysfs_entry
*ent
= rules
->entry
;
1063 if (!rules
->uuid_set
) {
1065 match
= strcmp(devnm
, rules
->devname
) == 0;
1067 match
= memcmp(dev
->uuid
, rules
->uuid
,
1068 sizeof(int[4])) == 0;
1071 while (match
&& ent
) {
1072 if (sysfs_rules_apply_check(dev
, ent
) < 0)
1073 pr_err("SYSFS: failed to write '%s' to '%s'\n",
1074 ent
->value
, ent
->name
);
1076 sysfs_set_str(dev
, NULL
, ent
->name
, ent
->value
);
1079 rules
= rules
->next
;
1083 static void sysfs_rule_free(struct dev_sysfs_rule
*rule
)
1085 struct sysfs_entry
*entry
;
1088 struct dev_sysfs_rule
*tmp
= rule
->next
;
1090 entry
= rule
->entry
;
1092 struct sysfs_entry
*tmp
= entry
->next
;
1101 free(rule
->devname
);
1107 void sysfsline(char *line
)
1109 struct dev_sysfs_rule
*sr
;
1112 sr
= xcalloc(1, sizeof(*sr
));
1113 for (w
= dl_next(line
); w
!= line
; w
= dl_next(w
)) {
1114 if (strncasecmp(w
, "name=", 5) == 0) {
1115 char *devname
= w
+ 5;
1117 if (strncmp(devname
, "/dev/md/", 8) == 0) {
1119 pr_err("Only give one device per SYSFS line: %s\n",
1122 sr
->devname
= xstrdup(devname
);
1124 pr_err("%s is an invalid name for an md device - ignored.\n",
1127 } else if (strncasecmp(w
, "uuid=", 5) == 0) {
1131 pr_err("Only give one uuid per SYSFS line: %s\n",
1134 if (parse_uuid(w
+ 5, sr
->uuid
) &&
1135 memcmp(sr
->uuid
, uuid_zero
,
1136 sizeof(int[4])) != 0)
1139 pr_err("Invalid uuid: %s\n", uuid
);
1142 struct sysfs_entry
*prop
;
1144 char *sep
= strchr(w
, '=');
1146 if (sep
== NULL
|| *(sep
+ 1) == 0) {
1147 pr_err("Cannot parse \"%s\" - ignoring.\n", w
);
1151 prop
= xmalloc(sizeof(*prop
));
1152 prop
->value
= xstrdup(sep
+ 1);
1154 prop
->name
= xstrdup(w
);
1155 prop
->next
= sr
->entry
;
1160 if (!sr
->devname
&& !sr
->uuid_set
) {
1161 pr_err("Device name not found in sysfs config entry - ignoring.\n");
1162 sysfs_rule_free(sr
);
1166 sr
->next
= sysfs_rules
;