]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - Assemble.c
2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * Email: <neilb@suse.de>
28 static int name_matches(char *found
, char *required
, char *homehost
)
30 /* See if the name found matches the required name, possibly
31 * prefixed with 'homehost'
35 strncpy(fnd
, found
, 32);
37 if (strcmp(found
, required
)==0)
40 int l
= strlen(homehost
);
41 if (l
< 32 && fnd
[l
] == ':' &&
42 strcmp(fnd
+l
+1, required
)==0)
48 static int is_member_busy(char *metadata_version
)
50 /* check if the given member array is active */
51 struct mdstat_ent
*mdstat
= mdstat_read(1, 0);
52 struct mdstat_ent
*ent
;
55 for (ent
= mdstat
; ent
; ent
= ent
->next
) {
56 if (ent
->metadata_version
== NULL
)
58 if (strncmp(ent
->metadata_version
, "external:", 9) != 0)
60 if (!is_subarray(&ent
->metadata_version
[9]))
62 /* Skip first char - it can be '/' or '-' */
63 if (strcmp(&ent
->metadata_version
[10], metadata_version
+1) == 0) {
73 static int ident_matches(struct mddev_ident
*ident
,
74 struct mdinfo
*content
,
75 struct supertype
*tst
,
77 char *update
, char *devname
)
80 if (ident
->uuid_set
&& (!update
|| strcmp(update
, "uuid")!= 0) &&
81 same_uuid(content
->uuid
, ident
->uuid
, tst
->ss
->swapuuid
)==0 &&
82 memcmp(content
->uuid
, uuid_zero
, sizeof(int[4])) != 0) {
84 fprintf(stderr
, Name
": %s has wrong uuid.\n",
88 if (ident
->name
[0] && (!update
|| strcmp(update
, "name")!= 0) &&
89 name_matches(content
->name
, ident
->name
, homehost
)==0) {
91 fprintf(stderr
, Name
": %s has wrong name.\n",
95 if (ident
->super_minor
!= UnSet
&&
96 ident
->super_minor
!= content
->array
.md_minor
) {
98 fprintf(stderr
, Name
": %s has wrong super-minor.\n",
102 if (ident
->level
!= UnSet
&&
103 ident
->level
!= content
->array
.level
) {
105 fprintf(stderr
, Name
": %s has wrong raid level.\n",
109 if (ident
->raid_disks
!= UnSet
&&
110 ident
->raid_disks
!= content
->array
.raid_disks
) {
112 fprintf(stderr
, Name
": %s requires wrong number of drives.\n",
116 if (ident
->member
&& ident
->member
[0]) {
117 /* content->text_version must match */
118 char *s
= strchr(content
->text_version
+1, '/');
121 fprintf(stderr
, Name
": %s is not a container and one is required.\n",
124 } else if (strcmp(ident
->member
, s
+1) != 0) {
126 fprintf(stderr
, Name
": skipping wrong member %s is %s\n",
127 content
->text_version
, devname
);
135 int Assemble(struct supertype
*st
, char *mddev
,
136 struct mddev_ident
*ident
,
137 struct mddev_dev
*devlist
,
138 char *backup_file
, int invalid_backup
,
139 int readonly
, int runstop
,
140 char *update
, char *homehost
, int require_homehost
,
141 int verbose
, int force
)
144 * The task of Assemble is to find a collection of
145 * devices that should (according to their superblocks)
146 * form an array, and to give this collection to the MD driver.
147 * In Linux-2.4 and later, this involves submitting a
148 * SET_ARRAY_INFO ioctl with no arg - to prepare
149 * the array - and then submit a number of
150 * ADD_NEW_DISK ioctls to add disks into
151 * the array. Finally RUN_ARRAY might
152 * be submitted to start the array.
154 * Much of the work of Assemble is in finding and/or
155 * checking the disks to make sure they look right.
157 * If mddev is not set, then scan must be set and we
158 * read through the config file for dev+uuid mapping
159 * We recurse, setting mddev, for each device that
161 * - has a valid uuid (or any uuid if !uuidset)
163 * If mddev is set, we try to determine state of md.
164 * check version - must be at least 0.90.0
165 * check kernel version. must be at least 2.4.
166 * If not, we can possibly fall back on START_ARRAY
167 * Try to GET_ARRAY_INFO.
168 * If possible, give up
169 * If not, try to STOP_ARRAY just to make sure
171 * If !uuidset and scan, look in conf-file for uuid
172 * If not found, give up
173 * If !devlist and scan and uuidset, get list of devs from conf-file
176 * Check superblock - discard if bad
177 * Check uuid (set if we don't have one) - discard if no match
178 * Check superblock similarity if we have a superblock - discard if different
179 * Record events, devicenum
180 * This should give us a list of devices for the array
181 * We should collect the most recent event number
183 * Count disks with recent enough event count
184 * While force && !enough disks
185 * Choose newest rejected disks, update event count
186 * mark clean and rewrite superblock
189 * foreach device with recent events : ADD_NEW_DISK
190 * if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
192 * Check the device numbers in superblock are right
193 * update superblock if any changes
199 int auto_assem
= (mddev
== NULL
&& !ident
->uuid_set
&&
200 ident
->super_minor
== UnSet
&& ident
->name
[0] == 0
201 && (ident
->container
== NULL
|| ident
->member
== NULL
));
203 int vers
= vers
; /* Keep gcc quite - it really is initialised */
206 int uptodate
; /* set once we decide that this device is as
207 * recent as everything else in the array.
212 int *best
= NULL
; /* indexed by raid_disk */
215 unsigned int okcnt
, sparecnt
, rebuilding_cnt
;
216 unsigned int req_cnt
;
222 int report_missmatch
;
224 int start_partial_ok
= (runstop
>= 0) &&
225 (force
|| devlist
==NULL
|| auto_assem
);
226 unsigned int num_devs
;
227 struct mddev_dev
*tmpdev
;
229 struct mdinfo
*content
= NULL
;
234 char chosen_name
[1024];
235 struct domainlist
*domains
= NULL
;
237 if (get_linux_version() < 2004000)
241 * If any subdevs are listed, then any that don't
242 * match ident are discarded. Remainder must all match and
244 * If no subdevs, then we scan all devices in the config file, but
245 * there must be something in the identity
249 ident
->uuid_set
== 0 &&
250 (ident
->super_minor
< 0 || ident
->super_minor
== UnSet
) &&
251 ident
->name
[0] == 0 &&
252 (ident
->container
== NULL
|| ident
->member
== NULL
) &&
253 ident
->devices
== NULL
) {
254 fprintf(stderr
, Name
": No identity information available for %s - cannot assemble.\n",
255 mddev
? mddev
: "further assembly");
260 devlist
= conf_get_devs();
264 report_missmatch
= ((inargv
&& verbose
>= 0) || verbose
> 0);
266 /* We come back here when doing auto-assembly and attempting some
267 * set of devices failed. Those are now marked as ->used==2 and
268 * we ignore them and try again
271 tmpdev
= devlist
; num_devs
= 0;
277 tmpdev
= tmpdev
->next
;
280 if (!st
&& ident
->st
) st
= ident
->st
;
283 fprintf(stderr
, Name
": looking for devices for %s\n",
284 mddev
? mddev
: "further assembly");
286 /* first walk the list of devices to find a consistent set
287 * that match the criterea, if that is possible.
288 * We flag the ones we like with 'used'.
290 for (tmpdev
= devlist
;
292 tmpdev
= tmpdev
? tmpdev
->next
: NULL
) {
293 char *devname
= tmpdev
->devname
;
296 struct supertype
*tst
= dup_super(st
);
297 struct dev_policy
*pol
= NULL
;
298 int found_container
= 0;
300 if (tmpdev
->used
> 1) continue;
302 if (ident
->devices
&&
303 !match_oneof(ident
->devices
, devname
)) {
304 if (report_missmatch
)
305 fprintf(stderr
, Name
": %s is not one of %s\n", devname
, ident
->devices
);
309 dfd
= dev_open(devname
, O_RDONLY
|O_EXCL
);
311 if (report_missmatch
)
312 fprintf(stderr
, Name
": cannot open device %s: %s\n",
313 devname
, strerror(errno
));
315 } else if (fstat(dfd
, &stb
)< 0) {
317 fprintf(stderr
, Name
": fstat failed for %s: %s\n",
318 devname
, strerror(errno
));
320 } else if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
321 fprintf(stderr
, Name
": %s is not a block device.\n",
324 } else if (must_be_container(dfd
)) {
326 /* already found some components, this cannot
329 if (report_missmatch
)
330 fprintf(stderr
, Name
": %s is a container, but we are looking for components\n",
333 } if (!tst
&& (tst
= super_by_fd(dfd
, NULL
)) == NULL
) {
334 if (report_missmatch
)
335 fprintf(stderr
, Name
": not a recognisable container: %s\n",
338 } else if (!tst
->ss
->load_container
339 || tst
->ss
->load_container(tst
, dfd
, NULL
)) {
340 if (report_missmatch
)
341 fprintf(stderr
, Name
": no correct container type: %s\n",
344 } else if (auto_assem
&&
345 !conf_test_metadata(tst
->ss
->name
, (pol
= devnum_policy(stb
.st_rdev
)),
346 tst
->ss
->match_home(tst
, homehost
) == 1)) {
347 if (report_missmatch
)
348 fprintf(stderr
, Name
": %s has metadata type %s for which "
349 "auto-assembly is disabled\n",
350 devname
, tst
->ss
->name
);
355 if (!tst
&& (tst
= guess_super(dfd
)) == NULL
) {
356 if (report_missmatch
)
357 fprintf(stderr
, Name
": no recogniseable superblock on %s\n",
360 } else if (tst
->ss
->load_super(tst
,dfd
, NULL
)) {
361 if (report_missmatch
)
362 fprintf(stderr
, Name
": no RAID superblock on %s\n",
365 } else if (tst
->ss
->compare_super
== NULL
) {
366 if (report_missmatch
)
367 fprintf(stderr
, Name
": Cannot assemble %s metadata on %s\n",
368 tst
->ss
->name
, devname
);
370 } else if (auto_assem
&& st
== NULL
&&
371 !conf_test_metadata(tst
->ss
->name
, (pol
= devnum_policy(stb
.st_rdev
)),
372 tst
->ss
->match_home(tst
, homehost
) == 1)) {
373 if (report_missmatch
)
374 fprintf(stderr
, Name
": %s has metadata type %s for which "
375 "auto-assembly is disabled\n",
376 devname
, tst
->ss
->name
);
380 if (dfd
>= 0) close(dfd
);
381 if (tmpdev
->used
== 2) {
383 /* Ignore unrecognised devices during auto-assembly */
385 if (ident
->uuid_set
|| ident
->name
[0] ||
386 ident
->super_minor
!= UnSet
)
387 /* Ignore unrecognised device if looking for
392 fprintf(stderr
, Name
": %s has no superblock - assembly aborted\n",
395 st
->ss
->free_super(st
);
396 dev_policy_free(pol
);
397 domain_free(domains
);
401 if (found_container
) {
402 /* tmpdev is a container. We need to be either
403 * looking for a member, or auto-assembling
406 if (ident
->container
) {
407 if (ident
->container
[0] == '/' &&
408 !same_dev(ident
->container
, devname
)) {
409 if (report_missmatch
)
410 fprintf(stderr
, Name
": %s is not the container required (%s)\n",
411 devname
, ident
->container
);
414 if (ident
->container
[0] != '/') {
419 memset(content
, 0, sizeof(*content
));
420 tst
->ss
->getinfo_super(tst
, content
, NULL
);
422 if (!parse_uuid(ident
->container
, uuid
) ||
423 !same_uuid(content
->uuid
, uuid
, tst
->ss
->swapuuid
)) {
424 if (report_missmatch
)
425 fprintf(stderr
, Name
": %s has wrong UUID to be required container\n",
431 /* It is worth looking inside this container.
434 fprintf(stderr
, Name
": looking in container %s\n",
437 for (content
= tst
->ss
->container_content(tst
, NULL
);
439 content
= content
->next
) {
441 /* do not assemble arrays that might have bad blocks */
442 if (content
->array
.state
& (1<<MD_SB_BBM_ERRORS
)) {
443 fprintf(stderr
, Name
": BBM log found in metadata. "
444 "Cannot activate array(s).\n");
448 if (!ident_matches(ident
, content
, tst
,
450 report_missmatch
? devname
: NULL
))
451 /* message already printed */;
452 else if (is_member_busy(content
->text_version
)) {
453 if (report_missmatch
)
454 fprintf(stderr
, Name
": member %s in %s is already assembled\n",
455 content
->text_version
,
462 goto loop
; /* empty container */
465 st
= tst
; tst
= NULL
;
466 if (!auto_assem
&& inargv
&& tmpdev
->next
!= NULL
) {
467 fprintf(stderr
, Name
": %s is a container, but is not "
468 "only device given: confused and aborting\n",
470 st
->ss
->free_super(st
);
471 dev_policy_free(pol
);
472 domain_free(domains
);
476 fprintf(stderr
, Name
": found match on member %s in %s\n",
477 content
->text_version
, devname
);
479 /* make sure we finished the loop */
485 memset(content
, 0, sizeof(*content
));
486 tst
->ss
->getinfo_super(tst
, content
, NULL
);
488 if (!ident_matches(ident
, content
, tst
,
490 report_missmatch
? devname
: NULL
))
495 if (st
->minor_version
== -1)
496 st
->minor_version
= tst
->minor_version
;
498 if (memcmp(content
->uuid
, uuid_zero
,
499 sizeof(int[4])) == 0) {
500 /* this is a floating spare. It cannot define
501 * an array unless there are no more arrays of
502 * this type to be found. It can be included
503 * in an array of this type though.
509 if (st
->ss
!= tst
->ss
||
510 st
->minor_version
!= tst
->minor_version
||
511 st
->ss
->compare_super(st
, tst
) != 0) {
512 /* Some mismatch. If exactly one array matches this host,
513 * we can resolve on that one.
514 * Or, if we are auto assembling, we just ignore the second
520 int first
= st
->ss
->match_home(st
, homehost
);
521 int last
= tst
->ss
->match_home(tst
, homehost
);
523 (first
== 1 || last
== 1)) {
524 /* We can do something */
525 if (first
) {/* just ignore this one */
526 if (report_missmatch
)
527 fprintf(stderr
, Name
": %s misses out due to wrong homehost\n",
530 } else { /* reject all those sofar */
531 struct mddev_dev
*td
;
532 if (report_missmatch
)
533 fprintf(stderr
, Name
": %s overrides previous devices due to good homehost\n",
535 for (td
=devlist
; td
!= tmpdev
; td
=td
->next
)
543 fprintf(stderr
, Name
": superblock on %s doesn't match others - assembly aborted\n",
545 tst
->ss
->free_super(tst
);
546 st
->ss
->free_super(st
);
547 dev_policy_free(pol
);
548 domain_free(domains
);
554 /* Collect domain information from members only */
555 if (tmpdev
&& tmpdev
->used
== 1) {
557 pol
= devnum_policy(stb
.st_rdev
);
558 domain_merge(&domains
, pol
, tst
?tst
->ss
->name
:NULL
);
560 dev_policy_free(pol
);
563 tst
->ss
->free_super(tst
);
566 /* Check if we found some imsm spares but no members */
567 if (auto_assem
&& (!st
|| !st
->sb
))
568 for (tmpdev
= devlist
; tmpdev
; tmpdev
= tmpdev
->next
) {
569 if (tmpdev
->used
!= 3)
575 /* we need sb from one of the spares */
576 int dfd
= dev_open(tmpdev
->devname
, O_RDONLY
);
578 st
->ss
->load_super(st
, dfd
, NULL
))
585 /* Now reject spares that don't match domains of identified members */
586 for (tmpdev
= devlist
; tmpdev
; tmpdev
= tmpdev
->next
) {
588 if (tmpdev
->used
!= 3)
590 if (stat(tmpdev
->devname
, &stb
)< 0) {
591 fprintf(stderr
, Name
": fstat failed for %s: %s\n",
592 tmpdev
->devname
, strerror(errno
));
595 struct dev_policy
*pol
= NULL
;
596 pol
= devnum_policy(stb
.st_rdev
);
597 if (domain_test(domains
, pol
, NULL
))
598 /* take this spare if domains match */
601 /* if domains don't match mark as unused */
603 dev_policy_free(pol
);
606 domain_free(domains
);
608 if (!st
|| !st
->sb
|| !content
)
611 /* Now need to open the array device. Use create_mddev */
612 if (content
== &info
)
613 st
->ss
->getinfo_super(st
, content
, NULL
);
615 trustworthy
= FOREIGN
;
616 name
= content
->name
;
617 switch (st
->ss
->match_home(st
, homehost
)
618 ?: st
->ss
->match_home(st
, "any")) {
621 name
= strchr(content
->name
, ':');
625 name
= content
->name
;
629 /* If the array is listed in mdadm.conf or on
630 * command line, then we trust the name
631 * even if the array doesn't look local
636 content
->array
.level
== LEVEL_CONTAINER
) {
637 name
= content
->text_version
;
638 trustworthy
= METADATA
;
641 if (name
[0] && trustworthy
!= LOCAL
&&
642 ! require_homehost
&&
643 conf_name_is_free(name
))
646 if (trustworthy
== LOCAL
&&
648 /* Ignore 'host:' prefix of name */
649 name
= strchr(name
, ':')+1;
651 mdfd
= create_mddev(mddev
, name
, ident
->autof
, trustworthy
,
654 st
->ss
->free_super(st
);
660 vers
= md_get_version(mdfd
);
662 fprintf(stderr
, Name
": Assemble requires driver version 0.90.0 or later.\n"
663 " Upgrade your kernel or try --build\n");
667 if (mddev_busy(fd2devnum(mdfd
))) {
668 fprintf(stderr
, Name
": %s already active, cannot restart it!\n",
670 for (tmpdev
= devlist
;
671 tmpdev
&& tmpdev
->used
!= 1;
672 tmpdev
= tmpdev
->next
)
674 if (tmpdev
&& auto_assem
)
675 fprintf(stderr
, Name
": %s needed for %s...\n",
676 mddev
, tmpdev
->devname
);
679 st
->ss
->free_super(st
);
684 ioctl(mdfd
, STOP_ARRAY
, NULL
); /* just incase it was started but has no content */
687 if (content
!= &info
) {
688 /* This is a member of a container. Try starting the array. */
689 return assemble_container_content(st
, mdfd
, content
, runstop
,
690 chosen_name
, verbose
);
693 /* Ok, no bad inconsistancy, we can try updating etc */
695 content
->update_private
= NULL
;
696 devices
= malloc(num_devs
* sizeof(*devices
));
697 devmap
= calloc(num_devs
* content
->array
.raid_disks
, 1);
698 for (tmpdev
= devlist
; tmpdev
; tmpdev
=tmpdev
->next
) if (tmpdev
->used
== 1) {
699 char *devname
= tmpdev
->devname
;
701 /* looks like a good enough match to update the super block if needed */
705 /* prepare useful information in info structures */
707 struct supertype
*tst
;
711 if (strcmp(update
, "uuid")==0 &&
714 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
715 read(rfd
, ident
->uuid
, 16) != 16) {
716 *(__u32
*)(ident
->uuid
) = random();
717 *(__u32
*)(ident
->uuid
+1) = random();
718 *(__u32
*)(ident
->uuid
+2) = random();
719 *(__u32
*)(ident
->uuid
+3) = random();
721 if (rfd
>= 0) close(rfd
);
723 dfd
= dev_open(devname
, O_RDWR
|O_EXCL
);
726 if (dfd
< 0 || tst
->ss
->load_super(tst
, dfd
, NULL
) != 0) {
727 fprintf(stderr
, Name
": cannot re-read metadata from %s - aborting\n",
736 tst
->ss
->getinfo_super(tst
, content
, devmap
+ devcnt
* content
->array
.raid_disks
);
738 memcpy(content
->uuid
, ident
->uuid
, 16);
739 strcpy(content
->name
, ident
->name
);
740 content
->array
.md_minor
= minor(stb2
.st_rdev
);
742 if (strcmp(update
, "byteorder") == 0)
745 err
= tst
->ss
->update_super(tst
, content
, update
,
751 Name
": --update=%s not understood"
752 " for %s metadata\n",
753 update
, tst
->ss
->name
);
754 tst
->ss
->free_super(tst
);
762 if (strcmp(update
, "uuid")==0 &&
765 memcpy(ident
->uuid
, content
->uuid
, 16);
767 if (tst
->ss
->store_super(tst
, dfd
))
768 fprintf(stderr
, Name
": Could not re-write superblock on %s.\n",
772 if (strcmp(update
, "uuid")==0 &&
773 ident
->bitmap_fd
>= 0 && !bitmap_done
) {
774 if (bitmap_update_uuid(ident
->bitmap_fd
,
776 tst
->ss
->swapuuid
) != 0)
777 fprintf(stderr
, Name
": Could not update uuid on external bitmap.\n");
781 tst
->ss
->free_super(tst
);
785 struct supertype
*tst
= dup_super(st
);
787 dfd
= dev_open(devname
, O_RDWR
|O_EXCL
);
789 if (dfd
< 0 || tst
->ss
->load_super(tst
, dfd
, NULL
) != 0) {
790 fprintf(stderr
, Name
": cannot re-read metadata from %s - aborting\n",
799 tst
->ss
->getinfo_super(tst
, content
, devmap
+ devcnt
* content
->array
.raid_disks
);
800 tst
->ss
->free_super(tst
);
807 fprintf(stderr
, Name
": %s is identified as a member of %s, slot %d.\n",
808 devname
, mddev
, content
->disk
.raid_disk
);
809 devices
[devcnt
].devname
= devname
;
810 devices
[devcnt
].uptodate
= 0;
811 devices
[devcnt
].i
= *content
;
812 devices
[devcnt
].i
.disk
.major
= major(stb
.st_rdev
);
813 devices
[devcnt
].i
.disk
.minor
= minor(stb
.st_rdev
);
814 if (most_recent
< devcnt
) {
815 if (devices
[devcnt
].i
.events
816 > devices
[most_recent
].i
.events
)
817 most_recent
= devcnt
;
819 if (content
->array
.level
== LEVEL_MULTIPATH
)
820 /* with multipath, the raid_disk from the superblock is meaningless */
823 i
= devices
[devcnt
].i
.disk
.raid_disk
;
825 if (nextspare
< content
->array
.raid_disks
)
826 nextspare
= content
->array
.raid_disks
;
829 if (i
>= content
->array
.raid_disks
&&
835 int newbestcnt
= i
+10;
836 int *newbest
= malloc(sizeof(int)*newbestcnt
);
838 for (c
=0; c
< newbestcnt
; c
++)
840 newbest
[c
] = best
[c
];
845 bestcnt
= newbestcnt
;
848 devices
[best
[i
]].i
.events
849 == devices
[devcnt
].i
.events
850 && (devices
[best
[i
]].i
.disk
.minor
851 != devices
[devcnt
].i
.disk
.minor
)
853 && content
->array
.level
!= LEVEL_MULTIPATH
) {
854 /* two different devices with identical superblock.
855 * Could be a mis-detection caused by overlapping
856 * partitions. fail-safe.
858 fprintf(stderr
, Name
": WARNING %s and %s appear"
859 " to have very similar superblocks.\n"
860 " If they are really different, "
861 "please --zero the superblock on one\n"
862 " If they are the same or overlap,"
863 " please remove one from %s.\n",
864 devices
[best
[i
]].devname
, devname
,
865 inargv
? "the list" :
866 "the\n DEVICE list in mdadm.conf"
874 || (devices
[best
[i
]].i
.events
875 < devices
[devcnt
].i
.events
))
880 free(content
->update_private
);
881 content
->update_private
= NULL
;
884 fprintf(stderr
, Name
": no devices found for %s\n",
887 st
->ss
->free_super(st
);
894 if (update
&& strcmp(update
, "byteorder")==0)
895 st
->minor_version
= 90;
897 st
->ss
->getinfo_super(st
, content
, NULL
);
898 clean
= content
->array
.state
& 1;
900 /* now we have some devices that might be suitable.
903 avail
= malloc(content
->array
.raid_disks
);
904 memset(avail
, 0, content
->array
.raid_disks
);
908 for (i
=0; i
< bestcnt
; i
++) {
910 int event_margin
= 1; /* always allow a difference of '1'
911 * like the kernel does
914 /* note: we ignore error flags in multipath arrays
915 * as they don't make sense
917 if (content
->array
.level
!= LEVEL_MULTIPATH
)
918 if (!(devices
[j
].i
.disk
.state
& (1<<MD_DISK_ACTIVE
))) {
919 if (!(devices
[j
].i
.disk
.state
920 & (1<<MD_DISK_FAULTY
))) {
921 devices
[j
].uptodate
= 1;
926 /* If this devices thinks that 'most_recent' has failed, then
927 * we must reject this device.
929 if (j
!= most_recent
&&
930 content
->array
.raid_disks
> 0 &&
931 devices
[most_recent
].i
.disk
.raid_disk
>= 0 &&
932 devmap
[j
* content
->array
.raid_disks
+ devices
[most_recent
].i
.disk
.raid_disk
] == 0) {
934 fprintf(stderr
, Name
": ignoring %s as it reports %s as failed\n",
935 devices
[j
].devname
, devices
[most_recent
].devname
);
939 if (devices
[j
].i
.events
+event_margin
>=
940 devices
[most_recent
].i
.events
) {
941 devices
[j
].uptodate
= 1;
942 if (i
< content
->array
.raid_disks
) {
943 if (devices
[j
].i
.recovery_start
== MaxSector
||
944 (content
->reshape_active
&&
945 j
>= content
->array
.raid_disks
- content
->delta_disks
)) {
955 while (force
&& !enough(content
->array
.level
, content
->array
.raid_disks
,
956 content
->array
.layout
, 1,
958 /* Choose the newest best drive which is
959 * not up-to-date, update the superblock
963 struct supertype
*tst
;
964 unsigned long long current_events
;
966 for (i
= 0; i
< content
->array
.raid_disks
&& i
< bestcnt
; i
++) {
969 !devices
[j
].uptodate
&&
970 devices
[j
].i
.recovery_start
== MaxSector
&&
973 > devices
[chosen_drive
].i
.events
))
976 if (chosen_drive
< 0)
978 current_events
= devices
[chosen_drive
].i
.events
;
981 fprintf(stderr
, Name
": forcing event count in %s(%d) from %d upto %d\n",
982 devices
[chosen_drive
].devname
,
983 devices
[chosen_drive
].i
.disk
.raid_disk
,
984 (int)(devices
[chosen_drive
].i
.events
),
985 (int)(devices
[most_recent
].i
.events
));
986 fd
= dev_open(devices
[chosen_drive
].devname
, O_RDWR
|O_EXCL
);
988 fprintf(stderr
, Name
": Couldn't open %s for write - not updating\n",
989 devices
[chosen_drive
].devname
);
990 devices
[chosen_drive
].i
.events
= 0;
994 if (tst
->ss
->load_super(tst
,fd
, NULL
)) {
996 fprintf(stderr
, Name
": RAID superblock disappeared from %s - not updating.\n",
997 devices
[chosen_drive
].devname
);
998 devices
[chosen_drive
].i
.events
= 0;
1001 content
->events
= devices
[most_recent
].i
.events
;
1002 tst
->ss
->update_super(tst
, content
, "force-one",
1003 devices
[chosen_drive
].devname
, verbose
,
1006 if (tst
->ss
->store_super(tst
, fd
)) {
1008 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
1009 devices
[chosen_drive
].devname
);
1010 devices
[chosen_drive
].i
.events
= 0;
1011 tst
->ss
->free_super(tst
);
1015 devices
[chosen_drive
].i
.events
= devices
[most_recent
].i
.events
;
1016 devices
[chosen_drive
].uptodate
= 1;
1017 avail
[chosen_drive
] = 1;
1019 tst
->ss
->free_super(tst
);
1021 /* If there are any other drives of the same vintage,
1022 * add them in as well. We can't lose and we might gain
1024 for (i
= 0; i
< content
->array
.raid_disks
&& i
< bestcnt
; i
++) {
1027 !devices
[j
].uptodate
&&
1028 devices
[j
].i
.events
== current_events
) {
1035 /* Now we want to look at the superblock which the kernel will base things on
1036 * and compare the devices that we think are working with the devices that the
1037 * superblock thinks are working.
1038 * If there are differences and --force is given, then update this chosen
1042 st
->ss
->free_super(st
);
1043 for (i
=0; chosen_drive
< 0 && i
<bestcnt
; i
++) {
1049 if (!devices
[j
].uptodate
)
1052 if ((fd
=dev_open(devices
[j
].devname
, O_RDONLY
|O_EXCL
))< 0) {
1053 fprintf(stderr
, Name
": Cannot open %s: %s\n",
1054 devices
[j
].devname
, strerror(errno
));
1059 if (st
->ss
->load_super(st
,fd
, NULL
)) {
1061 fprintf(stderr
, Name
": RAID superblock has disappeared from %s\n",
1062 devices
[j
].devname
);
1069 if (st
->sb
== NULL
) {
1070 fprintf(stderr
, Name
": No suitable drives found for %s\n", mddev
);
1075 st
->ss
->getinfo_super(st
, content
, NULL
);
1077 sysfs_init(content
, mdfd
, 0);
1079 for (i
=0; i
<bestcnt
; i
++) {
1081 unsigned int desired_state
;
1083 if (i
< content
->array
.raid_disks
)
1084 desired_state
= (1<<MD_DISK_ACTIVE
) | (1<<MD_DISK_SYNC
);
1090 if (!devices
[j
].uptodate
)
1093 devices
[j
].i
.disk
.state
= desired_state
;
1094 if (!(devices
[j
].i
.array
.state
& 1))
1097 if (st
->ss
->update_super(st
, &devices
[j
].i
, "assemble", NULL
,
1098 verbose
, 0, NULL
)) {
1101 fprintf(stderr
, Name
": "
1102 "clearing FAULTY flag for device %d in %s for %s\n",
1103 j
, mddev
, devices
[j
].devname
);
1107 fprintf(stderr
, Name
": "
1108 "device %d in %s has wrong state in superblock, but %s seems ok\n",
1109 i
, mddev
, devices
[j
].devname
);
1113 if (!(super
.disks
[i
].i
.disk
.state
& (1 << MD_DISK_FAULTY
))) {
1114 fprintf(stderr
, Name
": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
1119 if (force
&& !clean
&&
1120 !enough(content
->array
.level
, content
->array
.raid_disks
,
1121 content
->array
.layout
, clean
,
1123 change
+= st
->ss
->update_super(st
, content
, "force-array",
1124 devices
[chosen_drive
].devname
, verbose
,
1131 fd
= dev_open(devices
[chosen_drive
].devname
, O_RDWR
|O_EXCL
);
1133 fprintf(stderr
, Name
": Could not open %s for write - cannot Assemble array.\n",
1134 devices
[chosen_drive
].devname
);
1139 if (st
->ss
->store_super(st
, fd
)) {
1141 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
1142 devices
[chosen_drive
].devname
);
1150 /* If we are in the middle of a reshape we may need to restore saved data
1151 * that was moved aside due to the reshape overwriting live data
1152 * The code of doing this lives in Grow.c
1155 if (content
->reshape_active
) {
1157 int *fdlist
= malloc(sizeof(int)* bestcnt
);
1159 fprintf(stderr
, Name
":%s has an active reshape - checking "
1160 "if critical section needs to be restored\n",
1162 for (i
=0; i
<bestcnt
; i
++) {
1165 fdlist
[i
] = dev_open(devices
[j
].devname
, O_RDWR
|O_EXCL
);
1166 if (fdlist
[i
] < 0) {
1167 fprintf(stderr
, Name
": Could not open %s for write - cannot Assemble array.\n",
1168 devices
[j
].devname
);
1176 err
= Grow_restart(st
, content
, fdlist
, bestcnt
,
1177 backup_file
, verbose
> 0);
1178 if (err
&& invalid_backup
) {
1180 fprintf(stderr
, Name
": continuing"
1181 " without restoring backup\n");
1187 if (fdlist
[i
]>=0) close(fdlist
[i
]);
1190 fprintf(stderr
, Name
": Failed to restore critical section for reshape, sorry.\n");
1191 if (backup_file
== NULL
)
1192 fprintf(stderr
," Possibly you needed to specify the --backup-file\n");
1199 /* count number of in-sync devices according to the superblock.
1200 * We must have this number to start the array without -s or -R
1202 req_cnt
= content
->array
.working_disks
;
1204 /* Almost ready to actually *do* something */
1208 /* First, fill in the map, so that udev can find our name
1209 * as soon as we become active.
1211 map_update(NULL
, fd2devnum(mdfd
), content
->text_version
,
1212 content
->uuid
, chosen_name
);
1214 rv
= set_array_info(mdfd
, st
, content
);
1216 fprintf(stderr
, Name
": failed to set array info for %s: %s\n",
1217 mddev
, strerror(errno
));
1218 ioctl(mdfd
, STOP_ARRAY
, NULL
);
1223 if (ident
->bitmap_fd
>= 0) {
1224 if (ioctl(mdfd
, SET_BITMAP_FILE
, ident
->bitmap_fd
) != 0) {
1225 fprintf(stderr
, Name
": SET_BITMAP_FILE failed.\n");
1226 ioctl(mdfd
, STOP_ARRAY
, NULL
);
1231 } else if (ident
->bitmap_file
) {
1232 /* From config file */
1233 int bmfd
= open(ident
->bitmap_file
, O_RDWR
);
1235 fprintf(stderr
, Name
": Could not open bitmap file %s\n",
1236 ident
->bitmap_file
);
1237 ioctl(mdfd
, STOP_ARRAY
, NULL
);
1242 if (ioctl(mdfd
, SET_BITMAP_FILE
, bmfd
) != 0) {
1243 fprintf(stderr
, Name
": Failed to set bitmapfile for %s\n", mddev
);
1245 ioctl(mdfd
, STOP_ARRAY
, NULL
);
1253 /* First, add the raid disks, but add the chosen one last */
1254 for (i
=0; i
<= bestcnt
; i
++) {
1258 if (j
== chosen_drive
)
1263 if (j
>= 0 /* && devices[j].uptodate */) {
1264 int dfd
= dev_open(devices
[j
].devname
,
1267 remove_partitions(dfd
);
1270 rv
= add_disk(mdfd
, st
, content
, &devices
[j
].i
);
1273 fprintf(stderr
, Name
": failed to add "
1278 if (i
< content
->array
.raid_disks
1283 } else if (verbose
> 0)
1284 fprintf(stderr
, Name
": added %s "
1286 devices
[j
].devname
, mddev
,
1287 devices
[j
].i
.disk
.raid_disk
);
1288 } else if (verbose
> 0 && i
< content
->array
.raid_disks
)
1289 fprintf(stderr
, Name
": no uptodate device for "
1294 if (content
->array
.level
== LEVEL_CONTAINER
) {
1296 fprintf(stderr
, Name
": Container %s has been "
1297 "assembled with %d drive%s",
1298 mddev
, okcnt
+sparecnt
, okcnt
+sparecnt
==1?"":"s");
1299 if (okcnt
< (unsigned)content
->array
.raid_disks
)
1300 fprintf(stderr
, " (out of %d)",
1301 content
->array
.raid_disks
);
1302 fprintf(stderr
, "\n");
1304 sysfs_uevent(content
, "change");
1305 wait_for(chosen_name
, mdfd
);
1313 ( enough(content
->array
.level
, content
->array
.raid_disks
,
1314 content
->array
.layout
, clean
, avail
, okcnt
) &&
1315 (okcnt
+ rebuilding_cnt
>= req_cnt
|| start_partial_ok
)
1317 /* This array is good-to-go.
1318 * If a reshape is in progress then we might need to
1319 * continue monitoring it. In that case we start
1320 * it read-only and let the grow code make it writable.
1324 if (content
->reshape_active
&&
1325 content
->delta_disks
<= 0)
1326 rv
= Grow_continue(mdfd
, st
, content
, backup_file
);
1329 rv
= ioctl(mdfd
, RUN_ARRAY
, NULL
);
1332 fprintf(stderr
, Name
": %s has been started with %d drive%s",
1333 mddev
, okcnt
, okcnt
==1?"":"s");
1334 if (okcnt
< (unsigned)content
->array
.raid_disks
)
1335 fprintf(stderr
, " (out of %d)", content
->array
.raid_disks
);
1337 fprintf(stderr
, "%s %d rebuilding", sparecnt
?",":" and", rebuilding_cnt
);
1339 fprintf(stderr
, " and %d spare%s", sparecnt
, sparecnt
==1?"":"s");
1340 fprintf(stderr
, ".\n");
1342 if (content
->reshape_active
&&
1343 content
->array
.level
>= 4 &&
1344 content
->array
.level
<= 6) {
1345 /* might need to increase the size
1346 * of the stripe cache - default is 256
1348 if (256 < 4 * (content
->array
.chunk_size
/4096)) {
1349 struct mdinfo
*sra
= sysfs_read(mdfd
, 0, 0);
1351 sysfs_set_num(sra
, NULL
,
1352 "stripe_cache_size",
1353 (4 * content
->array
.chunk_size
/ 4096) + 1);
1356 if (okcnt
< (unsigned)content
->array
.raid_disks
) {
1357 /* If any devices did not get added
1358 * because the kernel rejected them based
1359 * on event count, try adding them
1360 * again providing the action policy is
1361 * 're-add' or greater. The bitmap
1362 * might allow them to be included, or
1363 * they will become spares.
1365 for (i
= 0; i
<= bestcnt
; i
++) {
1367 if (j
>= 0 && !devices
[j
].uptodate
) {
1368 if (!disk_action_allows(&devices
[j
].i
, st
->ss
->name
, act_re_add
))
1370 rv
= add_disk(mdfd
, st
, content
,
1372 if (rv
== 0 && verbose
>= 0)
1374 Name
": %s has been re-added.\n",
1375 devices
[j
].devname
);
1379 wait_for(mddev
, mdfd
);
1383 /* There is a nasty race with 'mdadm --monitor'.
1384 * If it opens this device before we close it,
1385 * it gets an incomplete open on which IO
1386 * doesn't work and the capacity is
1388 * If we reopen (to check for layered devices)
1389 * before --monitor closes, we loose.
1391 * So: wait upto 1 second for there to be
1392 * a non-zero capacity.
1394 while (usecs
< 1000) {
1395 mdfd
= open(mddev
, O_RDONLY
);
1397 unsigned long long size
;
1398 if (get_dev_size(mdfd
, NULL
, &size
) &&
1410 fprintf(stderr
, Name
": failed to RUN_ARRAY %s: %s\n",
1411 mddev
, strerror(errno
));
1413 if (!enough(content
->array
.level
, content
->array
.raid_disks
,
1414 content
->array
.layout
, 1, avail
, okcnt
))
1415 fprintf(stderr
, Name
": Not enough devices to "
1416 "start the array.\n");
1417 else if (!enough(content
->array
.level
,
1418 content
->array
.raid_disks
,
1419 content
->array
.layout
, clean
,
1421 fprintf(stderr
, Name
": Not enough devices to "
1422 "start the array while not clean "
1423 "- consider --force.\n");
1426 ioctl(mdfd
, STOP_ARRAY
, NULL
);
1431 if (runstop
== -1) {
1432 fprintf(stderr
, Name
": %s assembled from %d drive%s",
1433 mddev
, okcnt
, okcnt
==1?"":"s");
1434 if (okcnt
!= (unsigned)content
->array
.raid_disks
)
1435 fprintf(stderr
, " (out of %d)", content
->array
.raid_disks
);
1436 fprintf(stderr
, ", but not started.\n");
1441 if (verbose
>= -1) {
1442 fprintf(stderr
, Name
": %s assembled from %d drive%s", mddev
, okcnt
, okcnt
==1?"":"s");
1444 fprintf(stderr
, "%s %d rebuilding", sparecnt
?", ":" and ", rebuilding_cnt
);
1446 fprintf(stderr
, " and %d spare%s", sparecnt
, sparecnt
==1?"":"s");
1447 if (!enough(content
->array
.level
, content
->array
.raid_disks
,
1448 content
->array
.layout
, 1, avail
, okcnt
))
1449 fprintf(stderr
, " - not enough to start the array.\n");
1450 else if (!enough(content
->array
.level
,
1451 content
->array
.raid_disks
,
1452 content
->array
.layout
, clean
,
1454 fprintf(stderr
, " - not enough to start the "
1455 "array while not clean - consider "
1458 if (req_cnt
== (unsigned)content
->array
.raid_disks
)
1459 fprintf(stderr
, " - need all %d to start it", req_cnt
);
1461 fprintf(stderr
, " - need %d of %d to start", req_cnt
, content
->array
.raid_disks
);
1462 fprintf(stderr
, " (use --run to insist).\n");
1466 ioctl(mdfd
, STOP_ARRAY
, NULL
);
1471 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
1472 * been updated to point to the current locations of devices.
1473 * so we can just start the array
1476 dev
= makedev(devices
[chosen_drive
].i
.disk
.major
,
1477 devices
[chosen_drive
].i
.disk
.minor
);
1478 if (ioctl(mdfd
, START_ARRAY
, dev
)) {
1479 fprintf(stderr
, Name
": Cannot start array: %s\n",
1490 int assemble_container_content(struct supertype
*st
, int mdfd
,
1491 struct mdinfo
*content
, int runstop
,
1492 char *chosen_name
, int verbose
)
1494 struct mdinfo
*dev
, *sra
;
1495 int working
= 0, preexist
= 0;
1496 struct map_ent
*map
= NULL
;
1498 sysfs_init(content
, mdfd
, 0);
1500 sra
= sysfs_read(mdfd
, 0, GET_VERSION
);
1501 if (sra
== NULL
|| strcmp(sra
->text_version
, content
->text_version
) != 0)
1502 if (sysfs_set_array(content
, md_get_version(mdfd
)) != 0) {
1509 for (dev
= content
->devs
; dev
; dev
= dev
->next
)
1510 if (sysfs_add_disk(content
, dev
, 1) == 0)
1512 else if (errno
== EEXIST
)
1516 return 1;/* Nothing new, don't try to start */
1519 map_update(&map
, fd2devnum(mdfd
),
1520 content
->text_version
,
1521 content
->uuid
, chosen_name
);
1524 (working
+ preexist
) >= content
->array
.working_disks
) {
1527 switch(content
->array
.level
) {
1529 case LEVEL_MULTIPATH
:
1531 err
= sysfs_set_str(content
, NULL
, "array_state",
1535 err
= sysfs_set_str(content
, NULL
, "array_state",
1537 /* start mdmon if needed. */
1539 if (!mdmon_running(st
->container_dev
))
1540 start_mdmon(st
->container_dev
);
1541 ping_monitor(devnum2devname(st
->container_dev
));
1546 sysfs_set_safemode(content
, content
->safe_mode_delay
);
1549 fprintf(stderr
, Name
1550 ": array %s now has %d devices",
1551 chosen_name
, working
+ preexist
);
1553 fprintf(stderr
, Name
1554 ": Started %s with %d devices",
1555 chosen_name
, working
+ preexist
);
1557 fprintf(stderr
, " (%d new)", working
);
1558 fprintf(stderr
, "\n");
1561 wait_for(chosen_name
, mdfd
);
1564 /* FIXME should have an O_EXCL and wait for read-auto */
1567 fprintf(stderr
, Name
1568 ": %s assembled with %d devices but "
1570 chosen_name
, working
);