]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - Incremental.c
2 * Incremental.c - support --incremental. 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>
27 * QVB Post Office, NSW 1230
33 static int count_active(struct supertype
*st
, int mdfd
, char **availp
,
35 static void find_reject(int mdfd
, struct supertype
*st
, struct mdinfo
*sra
,
36 int number
, __u64 events
, int verbose
,
39 int Incremental(char *devname
, int verbose
, int runstop
,
40 struct supertype
*st
, char *homehost
, int autof
)
42 /* Add this device to an array, creating the array if necessary
43 * and starting the array if sensible or - if runstop>0 - if possible.
45 * This has several steps:
47 * 1/ Check if device is permitted by mdadm.conf, reject if not.
48 * 2/ Find metadata, reject if none appropriate (check
49 * version/name from args)
50 * 3/ Check if there is a match in mdadm.conf
51 * 3a/ if not, check for homehost match. If no match, reject.
52 * 4/ Determine device number.
53 * - If in mdadm.conf with std name, use that
54 * - UUID in /var/run/mdadm.map use that
55 * - If name is suggestive, use that. unless in use with different uuid.
56 * - Choose a free, high number.
57 * - Use a partitioned device unless strong suggestion not to.
59 * 5/ Find out if array already exists
61 * - choose a name, from mdadm.conf or 'name' field in array.
65 * - check one drive in array to make sure metadata is a reasonably
66 * close match. Reject if not (e.g. different type)
68 * 6/ Make sure /var/run/mdadm.map contains this array.
69 * 7/ Is there enough devices to possibly start the array?
70 * 7a/ if not, finish with success.
72 * - read all metadata and arrange devices like -A does
73 * - if number of OK devices match expected, or -R and there are enough,
74 * start the array (auto-readonly).
77 struct mdinfo info
, info2
;
78 struct mddev_ident_s
*array_list
, *match
;
79 char chosen_name
[1024];
82 struct map_ent
*mp
, *map
= NULL
;
88 struct createinfo
*ci
= conf_get_create_info();
93 /* 1/ Check if devices is permitted by mdadm.conf */
95 if (!conf_test_dev(devname
)) {
98 ": %s not permitted by mdadm.conf.\n",
103 /* 2/ Find metadata, reject if none appropriate (check
104 * version/name from args) */
106 dfd
= dev_open(devname
, O_RDONLY
|O_EXCL
);
109 fprintf(stderr
, Name
": cannot open %s: %s.\n",
110 devname
, strerror(errno
));
113 if (fstat(dfd
, &stb
) < 0) {
115 fprintf(stderr
, Name
": fstat failed for %s: %s.\n",
116 devname
, strerror(errno
));
120 if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
122 fprintf(stderr
, Name
": %s is not a block device.\n",
128 if (st
== NULL
&& (st
= guess_super(dfd
)) == NULL
) {
131 ": no recognisable superblock on %s.\n",
136 if (st
->ss
->load_super(st
, dfd
, NULL
)) {
138 fprintf(stderr
, Name
": no RAID superblock on %s.\n",
145 if (st
->ss
->container_content
) {
146 /* This is a pre-built container array, so we do something
149 return Incremental_container(st
, devname
, verbose
, runstop
,
153 st
->ss
->getinfo_super(st
, &info
);
154 /* 3/ Check if there is a match in mdadm.conf */
156 array_list
= conf_get_ident(NULL
);
158 for (; array_list
; array_list
= array_list
->next
) {
159 if (array_list
->uuid_set
&&
160 same_uuid(array_list
->uuid
, info
.uuid
, st
->ss
->swapuuid
)
164 ": UUID differs from %s.\n",
165 array_list
->devname
);
168 if (array_list
->name
[0] &&
169 strcasecmp(array_list
->name
, info
.name
) != 0) {
172 ": Name differs from %s.\n",
173 array_list
->devname
);
176 if (array_list
->devices
&&
177 !match_oneof(array_list
->devices
, devname
)) {
180 ": Not a listed device for %s.\n",
181 array_list
->devname
);
184 if (array_list
->super_minor
!= UnSet
&&
185 array_list
->super_minor
!= info
.array
.md_minor
) {
188 ": Different super-minor to %s.\n",
189 array_list
->devname
);
192 if (!array_list
->uuid_set
&&
193 !array_list
->name
[0] &&
194 !array_list
->devices
&&
195 array_list
->super_minor
== UnSet
) {
198 ": %s doesn't have any identifying information.\n",
199 array_list
->devname
);
202 /* FIXME, should I check raid_disks and level too?? */
207 ": we match both %s and %s - cannot decide which to use.\n",
208 match
->devname
, array_list
->devname
);
214 /* 3a/ if not, check for homehost match. If no match, reject. */
216 if (homehost
== NULL
||
217 st
->ss
->match_home(st
, homehost
) == 0) {
220 ": not found in mdadm.conf and not identified by homehost.\n");
224 /* 4/ Determine device number. */
225 /* - If in mdadm.conf with std name, use that */
226 /* - UUID in /var/run/mdadm.map use that */
227 /* - If name is suggestive, use that. unless in use with */
228 /* different uuid. */
229 /* - Choose a free, high number. */
230 /* - Use a partitioned device unless strong suggestion not to. */
232 if (match
&& is_standard(match
->devname
, &devnum
))
233 /* We have devnum now */;
234 else if ((mp
= map_by_uuid(&map
, info
.uuid
)) != NULL
)
237 /* Have to guess a bit. */
238 int use_partitions
= 1;
240 if ((autof
&7) == 3 || (autof
&7) == 5)
242 np
= strchr(info
.name
, ':');
247 devnum
= strtoul(np
, &ep
, 10);
248 if (ep
> np
&& *ep
== 0) {
249 /* This is a number. Let check that it is unused. */
250 if (mddev_busy(use_partitions
? (-1-devnum
) : devnum
))
256 /* Haven't found anything yet, choose something free */
257 devnum
= find_free_devnum(use_partitions
);
259 if (devnum
== NoMdDev
) {
261 ": No spare md devices!!\n");
265 devnum
= use_partitions
? (-1-devnum
) : devnum
;
267 mdfd
= open_mddev_devnum(match
? match
->devname
: NULL
,
270 chosen_name
, autof
>> 3);
272 fprintf(stderr
, Name
": failed to open %s: %s.\n",
273 chosen_name
, strerror(errno
));
276 /* 5/ Find out if array already exists */
277 if (! mddev_busy(devnum
)) {
278 /* 5a/ if it does not */
279 /* - choose a name, from mdadm.conf or 'name' field in array. */
280 /* - create the array */
281 /* - add the device */
282 mdu_array_info_t ainf
;
283 mdu_disk_info_t disk
;
287 memset(&ainf
, 0, sizeof(ainf
));
288 ainf
.major_version
= st
->ss
->major
;
289 ainf
.minor_version
= st
->minor_version
;
290 if (ioctl(mdfd
, SET_ARRAY_INFO
, &ainf
) != 0) {
292 ": SET_ARRAY_INFO failed for %s: %s\b",
293 chosen_name
, strerror(errno
));
297 sprintf(md
, "%d.%d\n", st
->ss
->major
, st
->minor_version
);
298 sra
= sysfs_read(mdfd
, devnum
, GET_VERSION
);
299 sysfs_set_str(sra
, NULL
, "metadata_version", md
);
300 memset(&disk
, 0, sizeof(disk
));
301 disk
.major
= major(stb
.st_rdev
);
302 disk
.minor
= minor(stb
.st_rdev
);
304 if (ioctl(mdfd
, ADD_NEW_DISK
, &disk
) != 0) {
305 fprintf(stderr
, Name
": failed to add %s to %s: %s.\n",
306 devname
, chosen_name
, strerror(errno
));
307 ioctl(mdfd
, STOP_ARRAY
, 0);
311 sra
= sysfs_read(mdfd
, devnum
, GET_DEVS
);
312 if (!sra
|| !sra
->devs
|| sra
->devs
->disk
.raid_disk
>= 0) {
313 /* It really should be 'none' - must be old buggy
314 * kernel, and mdadm -I may not be able to complete.
317 ioctl(mdfd
, STOP_ARRAY
, NULL
);
319 ": You have an old buggy kernel which cannot support\n"
320 " --incremental reliably. Aborting.\n");
327 /* - check one drive in array to make sure metadata is a reasonably */
328 /* close match. Reject if not (e.g. different type) */
329 /* - add the device */
332 mdu_disk_info_t disk
;
335 struct supertype
*st2
;
336 sra
= sysfs_read(mdfd
, devnum
, (GET_VERSION
| GET_DEVS
|
339 if (sra
->array
.major_version
!= st
->ss
->major
||
340 sra
->array
.minor_version
!= st
->minor_version
) {
343 ": %s has different metadata to chosen array %s %d.%d %d.%d.\n",
344 devname
, chosen_name
,
345 sra
->array
.major_version
,
346 sra
->array
.minor_version
,
347 st
->ss
->major
, st
->minor_version
);
351 sprintf(dn
, "%d:%d", sra
->devs
->disk
.major
,
352 sra
->devs
->disk
.minor
);
353 dfd2
= dev_open(dn
, O_RDONLY
);
355 if (st2
->ss
->load_super(st2
, dfd2
, NULL
)) {
357 ": Strange error loading metadata for %s.\n",
364 st2
->ss
->getinfo_super(st2
, &info2
);
365 st2
->ss
->free_super(st2
);
366 if (info
.array
.level
!= info2
.array
.level
||
367 memcmp(info
.uuid
, info2
.uuid
, 16) != 0 ||
368 info
.array
.raid_disks
!= info2
.array
.raid_disks
) {
370 ": unexpected difference between %s and %s.\n",
371 chosen_name
, devname
);
375 memset(&disk
, 0, sizeof(disk
));
376 disk
.major
= major(stb
.st_rdev
);
377 disk
.minor
= minor(stb
.st_rdev
);
378 err
= ioctl(mdfd
, ADD_NEW_DISK
, &disk
);
379 if (err
< 0 && errno
== EBUSY
) {
380 /* could be another device present with the same
381 * disk.number. Find and reject any such
383 find_reject(mdfd
, st
, sra
, info
.disk
.number
,
384 info
.events
, verbose
, chosen_name
);
385 err
= ioctl(mdfd
, ADD_NEW_DISK
, &disk
);
388 fprintf(stderr
, Name
": failed to add %s to %s: %s.\n",
389 devname
, chosen_name
, strerror(errno
));
394 /* 6/ Make sure /var/run/mdadm.map contains this array. */
395 map_update(&map
, devnum
,
396 info
.array
.major_version
,
397 info
.array
.minor_version
,
398 info
.uuid
, chosen_name
);
400 /* 7/ Is there enough devices to possibly start the array? */
401 /* 7a/ if not, finish with success. */
403 active_disks
= count_active(st
, mdfd
, &avail
, &info
);
404 if (enough(info
.array
.level
, info
.array
.raid_disks
,
405 info
.array
.layout
, info
.array
.state
& 1,
406 avail
, active_disks
) == 0) {
410 ": %s attached to %s, not enough to start (%d).\n",
411 devname
, chosen_name
, active_disks
);
418 /* - if number of OK devices match expected, or -R and there */
420 /* + add any bitmap file */
421 /* + start the array (auto-readonly). */
423 mdu_array_info_t ainf
;
425 if (ioctl(mdfd
, GET_ARRAY_INFO
, &ainf
) == 0) {
428 ": %s attached to %s which is already active.\n",
429 devname
, chosen_name
);
434 if (runstop
> 0 || active_disks
>= info
.array
.working_disks
) {
436 /* Let's try to start it */
437 if (match
&& match
->bitmap_file
) {
438 int bmfd
= open(match
->bitmap_file
, O_RDWR
);
441 ": Could not open bitmap file %s.\n",
446 if (ioctl(mdfd
, SET_BITMAP_FILE
, bmfd
) != 0) {
449 ": Failed to set bitmapfile for %s.\n",
456 sra
= sysfs_read(mdfd
, devnum
, 0);
457 if (sra
== NULL
|| active_disks
>= info
.array
.working_disks
)
458 rv
= ioctl(mdfd
, RUN_ARRAY
, NULL
);
460 rv
= sysfs_set_str(sra
, NULL
,
461 "array_state", "read-auto");
465 ": %s attached to %s, which has been started.\n",
466 devname
, chosen_name
);
470 ": %s attached to %s, but failed to start: %s.\n",
471 devname
, chosen_name
, strerror(errno
));
477 ": %s attached to %s, not enough to start safely.\n",
478 devname
, chosen_name
);
485 static void find_reject(int mdfd
, struct supertype
*st
, struct mdinfo
*sra
,
486 int number
, __u64 events
, int verbose
,
489 /* Find a device attached to this array with a disk.number of number
490 * and events less than the passed events, and remove the device.
495 if (ioctl(mdfd
, GET_ARRAY_INFO
, &ra
) == 0)
496 return; /* not safe to remove from active arrays
497 * without thinking more */
499 for (d
= sra
->devs
; d
; d
= d
->next
) {
503 sprintf(dn
, "%d:%d", d
->disk
.major
, d
->disk
.minor
);
504 dfd
= dev_open(dn
, O_RDONLY
);
507 if (st
->ss
->load_super(st
, dfd
, NULL
)) {
511 st
->ss
->getinfo_super(st
, &info
);
512 st
->ss
->free_super(st
);
515 if (info
.disk
.number
!= number
||
516 info
.events
>= events
)
519 if (d
->disk
.raid_disk
> -1)
520 sysfs_set_str(sra
, d
, "slot", "none");
521 if (sysfs_set_str(sra
, d
, "state", "remove") == 0)
524 ": removing old device %s from %s\n",
525 d
->sys_name
+4, array_name
);
529 static int count_active(struct supertype
*st
, int mdfd
, char **availp
,
530 struct mdinfo
*bestinfo
)
532 /* count how many devices in sra think they are active */
534 int cnt
= 0, cnt1
= 0;
535 __u64 max_events
= 0;
536 struct mdinfo
*sra
= sysfs_read(mdfd
, -1, GET_DEVS
| GET_STATE
);
539 for (d
= sra
->devs
; d
; d
= d
->next
) {
545 sprintf(dn
, "%d:%d", d
->disk
.major
, d
->disk
.minor
);
546 dfd
= dev_open(dn
, O_RDONLY
);
549 ok
= st
->ss
->load_super(st
, dfd
, NULL
);
553 st
->ss
->getinfo_super(st
, &info
);
554 if (info
.disk
.state
& (1<<MD_DISK_SYNC
))
557 avail
= malloc(info
.array
.raid_disks
);
558 memset(avail
, 0, info
.array
.raid_disks
);
562 max_events
= info
.events
;
563 avail
[info
.disk
.raid_disk
] = 2;
564 st
->ss
->getinfo_super(st
, bestinfo
);
565 } else if (info
.events
== max_events
) {
567 avail
[info
.disk
.raid_disk
] = 2;
568 } else if (info
.events
== max_events
-1) {
570 avail
[info
.disk
.raid_disk
] = 1;
571 } else if (info
.events
< max_events
- 1)
573 else if (info
.events
== max_events
+1) {
577 max_events
= info
.events
;
578 for (i
=0; i
<info
.array
.raid_disks
; i
++)
581 avail
[info
.disk
.raid_disk
] = 2;
582 st
->ss
->getinfo_super(st
, bestinfo
);
583 } else { /* info.events much bigger */
585 memset(avail
, 0, info
.disk
.raid_disk
);
586 max_events
= info
.events
;
587 st
->ss
->getinfo_super(st
, bestinfo
);
590 st
->ss
->free_super(st
);
595 void RebuildMap(void)
597 struct mdstat_ent
*mdstat
= mdstat_read(0, 0);
598 struct mdstat_ent
*md
;
599 struct map_ent
*map
= NULL
;
600 int mdp
= get_mdp_major();
602 for (md
= mdstat
; md
; md
= md
->next
) {
603 struct mdinfo
*sra
= sysfs_read(-1, md
->devnum
, GET_DEVS
);
606 for (sd
= sra
->devs
; sd
; sd
= sd
->next
) {
610 struct supertype
*st
;
614 sprintf(dn
, "%d:%d", sd
->disk
.major
, sd
->disk
.minor
);
615 dfd
= dev_open(dn
, O_RDONLY
);
618 st
= guess_super(dfd
);
622 ok
= st
->ss
->load_super(st
, dfd
, NULL
);
626 st
->ss
->getinfo_super(st
, &info
);
628 path
= map_dev(MD_MAJOR
, md
->devnum
, 0);
630 path
= map_dev(mdp
, (-1-md
->devnum
)<< 6, 0);
631 map_add(&map
, md
->devnum
, st
->ss
->major
,
633 info
.uuid
, path
? : "/unknown");
634 st
->ss
->free_super(st
);
642 int IncrementalScan(int verbose
)
644 /* look at every device listed in the 'map' file.
645 * If one is found that is not running then:
646 * look in mdadm.conf for bitmap file.
647 * if one exists, but array has none, add it.
648 * try to start array in auto-readonly mode
650 struct map_ent
*mapl
= NULL
;
652 mddev_ident_t devs
, mddev
;
656 devs
= conf_get_ident(NULL
);
658 for (me
= mapl
; me
; me
= me
->next
) {
660 mdu_array_info_t array
;
661 mdu_bitmap_file_t bmf
;
663 int mdfd
= open_mddev_devnum(me
->path
, me
->devnum
,
667 if (ioctl(mdfd
, GET_ARRAY_INFO
, &array
) == 0 ||
672 /* Ok, we can try this one. Maybe it needs a bitmap */
673 for (mddev
= devs
; mddev
; mddev
= mddev
->next
)
674 if (strcmp(mddev
->devname
, me
->path
) == 0)
676 if (mddev
&& mddev
->bitmap_file
) {
678 * Note: early kernels will wrongly fail this, so it
682 if (ioctl(mdfd
, GET_ARRAY_INFO
, &bmf
) < 0) {
683 int bmfd
= open(mddev
->bitmap_file
, O_RDWR
);
685 added
= ioctl(mdfd
, SET_BITMAP_FILE
,
693 ": Added bitmap %s to %s\n",
694 mddev
->bitmap_file
, me
->path
);
695 else if (errno
!= EEXIST
)
697 ": Failed to add bitmap to %s: %s\n",
698 me
->path
, strerror(errno
));
701 sra
= sysfs_read(mdfd
, 0, 0);
703 if (sysfs_set_str(sra
, NULL
,
704 "array_state", "read-auto") == 0) {
707 ": started array %s\n",
711 ": failed to start array %s: %s\n",
712 me
->path
, strerror(errno
));
720 static char *container2devname(char *devname
)
722 int fd
= open(devname
, O_RDONLY
);
726 mdname
= devnum2devname(fd2devnum(fd
));
733 int Incremental_container(struct supertype
*st
, char *devname
, int verbose
,
734 int runstop
, int autof
)
736 /* Collect the contents of this container and for each
737 * array, choose a device name and assemble the array.
740 struct mdinfo
*list
= st
->ss
->container_content(st
);
742 char *mdname
= container2devname(devname
);
745 fprintf(stderr
, Name
": failed to determine device name\n");
749 for (ra
= list
; ra
; ra
= ra
->next
) {
754 char chosen_name
[1024];
760 if ((autof
&7) == 3 || (autof
&7) == 5)
767 devnum
= strtoul(n
, &n
, 10);
768 if (devnum
>= 0 && (*n
== 0 || *n
== ' ')) {
769 /* Use this devnum */
770 usepart
= (ra
->name
[0] == 'd');
771 if (mddev_busy(usepart
? (-1-devnum
) : devnum
))
778 devnum
= usepart
? (-1-devnum
) : devnum
;
780 devnum
= find_free_devnum(usepart
);
781 mdfd
= open_mddev_devnum(NULL
, devnum
, ra
->name
,
782 chosen_name
, autof
>>3);
785 fprintf(stderr
, Name
": failed to open %s: %s.\n",
786 chosen_name
, strerror(errno
));
790 sra
= sysfs_read(mdfd
, 0, 0);
792 sprintf(ver
, "external:/%s/%d", mdname
, ra
->container_member
);
793 sysfs_set_str(sra
, NULL
, "metadata_version", ver
);
795 sysfs_set_array(sra
, ra
);
796 for (dev
= ra
->devs
; dev
; dev
= dev
->next
) {
799 sprintf(buf
, "%d:%d", dev
->disk
.major
, dev
->disk
.minor
);
800 dfd
= dev_open(buf
, O_RDONLY
);
801 if (sysfs_add_disk(sra
, dfd
, dev
) == 0)
804 if (runstop
> 0 || working
>= ra
->array
.working_disks
) {
805 switch(ra
->array
.level
) {
807 case LEVEL_MULTIPATH
:
809 sysfs_set_str(sra
, NULL
, "array_state",
813 sysfs_set_str(sra
, NULL
, "array_state",
818 printf("Started %s with %d devices\n",
819 chosen_name
, working
);
822 printf("%s assembled with %d devices but "
824 chosen_name
, working
);