]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - Assemble.c
2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2006 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@cse.unsw.edu.au>
24 * School of Computer Science and Engineering
25 * The University of New South Wales
33 static int name_matches(char *found
, char *required
, char *homehost
)
35 /* See if the name found matches the required name, possibly
36 * prefixed with 'homehost'
40 strncpy(fnd
, found
, 32);
42 if (strcmp(found
, required
)==0)
45 int l
= strlen(homehost
);
46 if (l
< 32 && fnd
[l
] == ':' &&
47 strcmp(fnd
+l
+1, required
)==0)
53 int Assemble(struct supertype
*st
, char *mddev
,
55 mddev_dev_t devlist
, char *backup_file
,
56 int readonly
, int runstop
,
57 char *update
, char *homehost
,
58 int verbose
, int force
)
61 * The task of Assemble is to find a collection of
62 * devices that should (according to their superblocks)
63 * form an array, and to give this collection to the MD driver.
64 * In Linux-2.4 and later, this involves submitting a
65 * SET_ARRAY_INFO ioctl with no arg - to prepare
66 * the array - and then submit a number of
67 * ADD_NEW_DISK ioctls to add disks into
68 * the array. Finally RUN_ARRAY might
69 * be submitted to start the array.
71 * Much of the work of Assemble is in finding and/or
72 * checking the disks to make sure they look right.
74 * If mddev is not set, then scan must be set and we
75 * read through the config file for dev+uuid mapping
76 * We recurse, setting mddev, for each device that
78 * - has a valid uuid (or any uuid if !uuidset)
80 * If mddev is set, we try to determine state of md.
81 * check version - must be at least 0.90.0
82 * check kernel version. must be at least 2.4.
83 * If not, we can possibly fall back on START_ARRAY
84 * Try to GET_ARRAY_INFO.
85 * If possible, give up
86 * If not, try to STOP_ARRAY just to make sure
88 * If !uuidset and scan, look in conf-file for uuid
89 * If not found, give up
90 * If !devlist and scan and uuidset, get list of devs from conf-file
93 * Check superblock - discard if bad
94 * Check uuid (set if we don't have one) - discard if no match
95 * Check superblock similarity if we have a superblock - discard if different
96 * Record events, devicenum
97 * This should give us a list of devices for the array
98 * We should collect the most recent event number
100 * Count disks with recent enough event count
101 * While force && !enough disks
102 * Choose newest rejected disks, update event count
103 * mark clean and rewrite superblock
106 * foreach device with recent events : ADD_NEW_DISK
107 * if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
109 * Check the device numbers in superblock are right
110 * update superblock if any changes
116 int auto_assem
= (mddev
== NULL
);
118 int vers
= vers
; /* Keep gcc quite - it really is initialised */
121 int uptodate
; /* set once we decide that this device is as
122 * recent as everything else in the array.
126 int *best
= NULL
; /* indexed by raid_disk */
127 unsigned int bestcnt
= 0;
129 unsigned int okcnt
, sparecnt
;
130 unsigned int req_cnt
;
137 int start_partial_ok
= (runstop
>= 0) &&
138 (force
|| devlist
==NULL
|| auto_assem
);
139 unsigned int num_devs
;
142 mdu_array_info_t tmp_inf
;
148 memset(&info
, 0, sizeof(info
));
150 if (get_linux_version() < 2004000)
154 * If any subdevs are listed, then any that don't
155 * match ident are discarded. Remainder must all match and
157 * If no subdevs, then we scan all devices in the config file, but
158 * there must be something in the identity
162 ident
->uuid_set
== 0 &&
163 ident
->super_minor
< 0 &&
164 ident
->devices
== NULL
) {
165 fprintf(stderr
, Name
": No identity information available for %s - cannot assemble.\n",
166 mddev
? mddev
: "further assembly");
170 /* if the configuration specifies a container then we use that to
171 * determine the devices and retrieve the array configuration
174 if (ident
->container
&& ident
->member
) {
175 int cfd
= open(ident
->container
, O_RDWR
);
177 struct supertype container
;
180 fprintf(stderr
, Name
": looking to assemble member array %s"
181 " inside container %s\n", ident
->member
, ident
->container
);
184 fprintf(stderr
, Name
": unable to open container %s: %s\n",
185 ident
->container
, strerror(errno
));
189 mdi
= sysfs_read(cfd
, fd2devnum(cfd
), GET_VERSION
);
193 fprintf(stderr
, Name
": unable to read container %s\n",
197 container
.ss
= find_metadata_methods(mdi
->text_version
);
201 fprintf(stderr
, Name
": %s uses unknown metadata: %s\n",
202 ident
->container
, mdi
->text_version
);
205 if (container
.ss
->load_super(&container
, cfd
, ident
->container
)) {
206 fprintf(stderr
, Name
": Cannot load metadata for container %s\n",
211 return Incremental_container(&container
, ident
->container
,
212 verbose
, runstop
, ident
->autof
,
217 devlist
= conf_get_devs();
222 /* We come back here when doing auto-assembly and attempting some
223 * set of devices failed. Those are now marked as ->used==2 and
224 * we ignore them and try again
227 tmpdev
= devlist
; num_devs
= 0;
233 tmpdev
= tmpdev
->next
;
235 devices
= malloc(num_devs
* sizeof(*devices
));
237 if (!st
&& ident
->st
) st
= ident
->st
;
240 fprintf(stderr
, Name
": looking for devices for %s\n",
241 mddev
? mddev
: "further assembly");
243 /* first walk the list of devices to find a consistent set
244 * that match the criterea, if that is possible.
245 * We flag the ones we like with 'used'.
247 for (tmpdev
= devlist
;
249 tmpdev
= tmpdev
->next
) {
250 char *devname
= tmpdev
->devname
;
253 struct supertype
*tst
= dup_super(st
);
255 if (tmpdev
->used
> 1) continue;
257 if (ident
->devices
&&
258 !match_oneof(ident
->devices
, devname
)) {
259 if ((inargv
&& verbose
>=0) || verbose
> 0)
260 fprintf(stderr
, Name
": %s is not one of %s\n", devname
, ident
->devices
);
264 dfd
= dev_open(devname
, O_RDONLY
|O_EXCL
);
266 if ((inargv
&& verbose
>= 0) || verbose
> 0)
267 fprintf(stderr
, Name
": cannot open device %s: %s\n",
268 devname
, strerror(errno
));
270 } else if (fstat(dfd
, &stb
)< 0) {
272 fprintf(stderr
, Name
": fstat failed for %s: %s\n",
273 devname
, strerror(errno
));
275 } else if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
276 fprintf(stderr
, Name
": %s is not a block device.\n",
279 } else if (!tst
&& (tst
= guess_super(dfd
)) == NULL
) {
280 if ((inargv
&& verbose
>= 0) || verbose
> 0)
281 fprintf(stderr
, Name
": no recogniseable superblock on %s\n",
284 } else if (tst
->ss
->load_super(tst
,dfd
, NULL
)) {
285 if ((inargv
&& verbose
>= 0) || verbose
> 0)
286 fprintf( stderr
, Name
": no RAID superblock on %s\n",
289 tst
->ss
->getinfo_super(tst
, &info
);
291 if (dfd
>= 0) close(dfd
);
293 if (ident
->uuid_set
&& (!update
|| strcmp(update
, "uuid")!= 0) &&
295 same_uuid(info
.uuid
, ident
->uuid
, tst
->ss
->swapuuid
)==0)) {
296 if ((inargv
&& verbose
>= 0) || verbose
> 0)
297 fprintf(stderr
, Name
": %s has wrong uuid.\n",
301 if (ident
->name
[0] && (!update
|| strcmp(update
, "name")!= 0) &&
303 name_matches(info
.name
, ident
->name
, homehost
)==0)) {
304 if ((inargv
&& verbose
>= 0) || verbose
> 0)
305 fprintf(stderr
, Name
": %s has wrong name.\n",
309 if (ident
->super_minor
!= UnSet
&&
311 ident
->super_minor
!= info
.array
.md_minor
)) {
312 if ((inargv
&& verbose
>= 0) || verbose
> 0)
313 fprintf(stderr
, Name
": %s has wrong super-minor.\n",
317 if (ident
->level
!= UnSet
&&
319 ident
->level
!= info
.array
.level
)) {
320 if ((inargv
&& verbose
>= 0) || verbose
> 0)
321 fprintf(stderr
, Name
": %s has wrong raid level.\n",
325 if (ident
->raid_disks
!= UnSet
&&
327 ident
->raid_disks
!= info
.array
.raid_disks
)) {
328 if ((inargv
&& verbose
>= 0) || verbose
> 0)
329 fprintf(stderr
, Name
": %s requires wrong number of drives.\n",
334 if (tst
== NULL
|| tst
->sb
== NULL
)
337 /* If we are this far, then we are nearly commited to this device.
338 * If the super_block doesn't exist, or doesn't match others,
339 * then we probably cannot continue
340 * However if one of the arrays is for the homehost, and
341 * the other isn't that can disambiguate.
344 if (!tst
|| !tst
->sb
) {
345 fprintf(stderr
, Name
": %s has no superblock - assembly aborted\n",
348 st
->ss
->free_super(st
);
354 if (st
->minor_version
== -1)
355 st
->minor_version
= tst
->minor_version
;
356 if (st
->ss
!= tst
->ss
||
357 st
->minor_version
!= tst
->minor_version
||
358 st
->ss
->compare_super(st
, tst
) != 0) {
359 /* Some mismatch. If exactly one array matches this host,
360 * we can resolve on that one.
361 * Or, if we are auto assembling, we just ignore the second
367 int first
= st
->ss
->match_home(st
, homehost
);
368 int last
= tst
->ss
->match_home(tst
, homehost
);
370 (first
== 1 || last
== 1)) {
371 /* We can do something */
372 if (first
) {/* just ignore this one */
373 if ((inargv
&& verbose
>= 0) || verbose
> 0)
374 fprintf(stderr
, Name
": %s misses out due to wrong homehost\n",
377 } else { /* reject all those sofar */
379 if ((inargv
&& verbose
>= 0) || verbose
> 0)
380 fprintf(stderr
, Name
": %s overrides previous devices due to good homehost\n",
382 for (td
=devlist
; td
!= tmpdev
; td
=td
->next
)
390 fprintf(stderr
, Name
": superblock on %s doesn't match others - assembly aborted\n",
392 tst
->ss
->free_super(tst
);
393 st
->ss
->free_super(st
);
401 tst
->ss
->free_super(tst
);
407 /* Now need to open array the device. Use create_mddev */
408 st
->ss
->getinfo_super(st
, &info
);
410 trustworthy
= FOREIGN
;
411 switch (st
->ss
->match_home(st
, homehost
)) {
413 trustworthy
= FOREIGN
;
418 name
= strchr(info
.name
, ':');
425 if (info
.name
[0] == 0 && info
.array
.level
== LEVEL_CONTAINER
) {
426 name
= info
.text_version
;
427 trustworthy
= METADATA
;
429 trustworthy
= FOREIGN
;
432 mdfd
= create_mddev(mddev
, name
, ident
->autof
, trustworthy
, NULL
);
434 st
->ss
->free_super(st
);
440 vers
= md_get_version(mdfd
);
442 fprintf(stderr
, Name
": Assemble requires driver version 0.90.0 or later.\n"
443 " Upgrade your kernel or try --build\n");
447 if (ioctl(mdfd
, GET_ARRAY_INFO
, &tmp_inf
)==0) {
448 fprintf(stderr
, Name
": %s already active, cannot restart it!\n",
450 for (tmpdev
= devlist
;
451 tmpdev
&& tmpdev
->used
!= 1;
452 tmpdev
= tmpdev
->next
)
454 if (tmpdev
&& auto_assem
)
455 fprintf(stderr
, Name
": %s needed for %s...\n",
456 mddev
, tmpdev
->devname
);
459 st
->ss
->free_super(st
);
465 ioctl(mdfd
, STOP_ARRAY
, NULL
); /* just incase it was started but has no content */
467 /* Ok, no bad inconsistancy, we can try updating etc */
469 for (tmpdev
= devlist
; tmpdev
; tmpdev
=tmpdev
->next
) if (tmpdev
->used
== 1) {
470 char *devname
= tmpdev
->devname
;
472 /* looks like a good enough match to update the super block if needed */
476 /* prepare useful information in info structures */
478 struct supertype
*tst
;
481 if (strcmp(update
, "uuid")==0 &&
484 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
485 read(rfd
, ident
->uuid
, 16) != 16) {
486 *(__u32
*)(ident
->uuid
) = random();
487 *(__u32
*)(ident
->uuid
+1) = random();
488 *(__u32
*)(ident
->uuid
+2) = random();
489 *(__u32
*)(ident
->uuid
+3) = random();
491 if (rfd
>= 0) close(rfd
);
493 dfd
= dev_open(devname
, O_RDWR
|O_EXCL
);
495 remove_partitions(dfd
);
498 tst
->ss
->load_super(tst
, dfd
, NULL
);
499 tst
->ss
->getinfo_super(tst
, &info
);
501 memcpy(info
.uuid
, ident
->uuid
, 16);
502 strcpy(info
.name
, ident
->name
);
503 info
.array
.md_minor
= minor(stb2
.st_rdev
);
505 tst
->ss
->update_super(tst
, &info
, update
,
507 ident
->uuid_set
, homehost
);
508 if (strcmp(update
, "uuid")==0 &&
511 memcpy(ident
->uuid
, info
.uuid
, 16);
514 fprintf(stderr
, Name
": Cannot open %s for superblock update\n",
516 else if (tst
->ss
->store_super(tst
, dfd
))
517 fprintf(stderr
, Name
": Could not re-write superblock on %s.\n",
522 if (strcmp(update
, "uuid")==0 &&
523 ident
->bitmap_fd
>= 0 && !bitmap_done
) {
524 if (bitmap_update_uuid(ident
->bitmap_fd
,
526 tst
->ss
->swapuuid
) != 0)
527 fprintf(stderr
, Name
": Could not update uuid on external bitmap.\n");
531 tst
->ss
->free_super(tst
);
535 struct supertype
*tst
= dup_super(st
);
537 dfd
= dev_open(devname
, O_RDWR
|O_EXCL
);
539 remove_partitions(dfd
);
541 tst
->ss
->load_super(tst
, dfd
, NULL
);
542 tst
->ss
->getinfo_super(tst
, &info
);
543 tst
->ss
->free_super(tst
);
550 fprintf(stderr
, Name
": %s is identified as a member of %s, slot %d.\n",
551 devname
, mddev
, info
.disk
.raid_disk
);
552 devices
[devcnt
].devname
= devname
;
553 devices
[devcnt
].uptodate
= 0;
554 devices
[devcnt
].i
= info
;
555 devices
[devcnt
].i
.disk
.major
= major(stb
.st_rdev
);
556 devices
[devcnt
].i
.disk
.minor
= minor(stb
.st_rdev
);
557 if (most_recent
< devcnt
) {
558 if (devices
[devcnt
].i
.events
559 > devices
[most_recent
].i
.events
)
560 most_recent
= devcnt
;
562 if (info
.array
.level
== -4)
563 /* with multipath, the raid_disk from the superblock is meaningless */
566 i
= devices
[devcnt
].i
.disk
.raid_disk
;
568 if (nextspare
< info
.array
.raid_disks
)
569 nextspare
= info
.array
.raid_disks
;
572 if (i
>= info
.array
.raid_disks
&&
578 unsigned int newbestcnt
= i
+10;
579 int *newbest
= malloc(sizeof(int)*newbestcnt
);
581 for (c
=0; c
< newbestcnt
; c
++)
583 newbest
[c
] = best
[c
];
588 bestcnt
= newbestcnt
;
591 devices
[best
[i
]].i
.events
592 == devices
[devcnt
].i
.events
593 && (devices
[best
[i
]].i
.disk
.minor
594 != devices
[devcnt
].i
.disk
.minor
)
596 && info
.array
.level
!= LEVEL_MULTIPATH
) {
597 /* two different devices with identical superblock.
598 * Could be a mis-detection caused by overlapping
599 * partitions. fail-safe.
601 fprintf(stderr
, Name
": WARNING %s and %s appear"
602 " to have very similar superblocks.\n"
603 " If they are really different, "
604 "please --zero the superblock on one\n"
605 " If they are the same or overlap,"
606 " please remove one from %s.\n",
607 devices
[best
[i
]].devname
, devname
,
608 inargv
? "the list" :
609 "the\n DEVICE list in mdadm.conf"
615 || (devices
[best
[i
]].i
.events
616 < devices
[devcnt
].i
.events
))
623 fprintf(stderr
, Name
": no devices found for %s\n",
626 st
->ss
->free_super(st
);
631 if (update
&& strcmp(update
, "byteorder")==0)
632 st
->minor_version
= 90;
634 st
->ss
->getinfo_super(st
, &info
);
635 clean
= info
.array
.state
& 1;
637 /* now we have some devices that might be suitable.
640 avail
= malloc(info
.array
.raid_disks
);
641 memset(avail
, 0, info
.array
.raid_disks
);
644 for (i
=0; i
< bestcnt
;i
++) {
646 int event_margin
= 1; /* always allow a difference of '1'
647 * like the kernel does
650 /* note: we ignore error flags in multipath arrays
651 * as they don't make sense
653 if (info
.array
.level
!= -4)
654 if (!(devices
[j
].i
.disk
.state
& (1<<MD_DISK_SYNC
))) {
655 if (!(devices
[j
].i
.disk
.state
656 & (1<<MD_DISK_FAULTY
)))
660 if (devices
[j
].i
.events
+event_margin
>=
661 devices
[most_recent
].i
.events
) {
662 devices
[j
].uptodate
= 1;
663 if (i
< info
.array
.raid_disks
) {
670 while (force
&& !enough(info
.array
.level
, info
.array
.raid_disks
,
671 info
.array
.layout
, 1,
673 /* Choose the newest best drive which is
674 * not up-to-date, update the superblock
678 struct supertype
*tst
;
679 long long current_events
;
681 for (i
=0; i
<info
.array
.raid_disks
&& i
< bestcnt
; i
++) {
684 !devices
[j
].uptodate
&&
685 devices
[j
].i
.events
> 0 &&
688 > devices
[chosen_drive
].i
.events
))
691 if (chosen_drive
< 0)
693 current_events
= devices
[chosen_drive
].i
.events
;
696 fprintf(stderr
, Name
": forcing event count in %s(%d) from %d upto %d\n",
697 devices
[chosen_drive
].devname
,
698 devices
[chosen_drive
].i
.disk
.raid_disk
,
699 (int)(devices
[chosen_drive
].i
.events
),
700 (int)(devices
[most_recent
].i
.events
));
701 fd
= dev_open(devices
[chosen_drive
].devname
, O_RDWR
|O_EXCL
);
703 fprintf(stderr
, Name
": Couldn't open %s for write - not updating\n",
704 devices
[chosen_drive
].devname
);
705 devices
[chosen_drive
].i
.events
= 0;
709 if (tst
->ss
->load_super(tst
,fd
, NULL
)) {
711 fprintf(stderr
, Name
": RAID superblock disappeared from %s - not updating.\n",
712 devices
[chosen_drive
].devname
);
713 devices
[chosen_drive
].i
.events
= 0;
716 info
.events
= devices
[most_recent
].i
.events
;
717 tst
->ss
->update_super(tst
, &info
, "force-one",
718 devices
[chosen_drive
].devname
, verbose
,
721 if (tst
->ss
->store_super(tst
, fd
)) {
723 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
724 devices
[chosen_drive
].devname
);
725 devices
[chosen_drive
].i
.events
= 0;
726 tst
->ss
->free_super(tst
);
730 devices
[chosen_drive
].i
.events
= devices
[most_recent
].i
.events
;
731 devices
[chosen_drive
].uptodate
= 1;
732 avail
[chosen_drive
] = 1;
734 tst
->ss
->free_super(tst
);
736 /* If there are any other drives of the same vintage,
737 * add them in as well. We can't lose and we might gain
739 for (i
=0; i
<info
.array
.raid_disks
&& i
< bestcnt
; i
++) {
742 !devices
[j
].uptodate
&&
743 devices
[j
].i
.events
> 0 &&
744 devices
[j
].i
.events
== current_events
) {
751 /* Now we want to look at the superblock which the kernel will base things on
752 * and compare the devices that we think are working with the devices that the
753 * superblock thinks are working.
754 * If there are differences and --force is given, then update this chosen
758 st
->ss
->free_super(st
);
759 for (i
=0; chosen_drive
< 0 && i
<bestcnt
; i
++) {
765 if (!devices
[j
].uptodate
)
768 if ((fd
=dev_open(devices
[j
].devname
, O_RDONLY
|O_EXCL
))< 0) {
769 fprintf(stderr
, Name
": Cannot open %s: %s\n",
770 devices
[j
].devname
, strerror(errno
));
774 if (st
->ss
->load_super(st
,fd
, NULL
)) {
776 fprintf(stderr
, Name
": RAID superblock has disappeared from %s\n",
783 if (st
->sb
== NULL
) {
784 fprintf(stderr
, Name
": No suitable drives found for %s\n", mddev
);
788 st
->ss
->getinfo_super(st
, &info
);
790 sysfs_init(&info
, mdfd
, 0);
792 for (i
=0; i
<bestcnt
; i
++) {
794 unsigned int desired_state
;
796 if (i
< info
.array
.raid_disks
)
797 desired_state
= (1<<MD_DISK_ACTIVE
) | (1<<MD_DISK_SYNC
);
803 if (!devices
[j
].uptodate
)
806 devices
[j
].i
.disk
.state
= desired_state
;
808 if (st
->ss
->update_super(st
, &devices
[j
].i
, "assemble", NULL
,
812 fprintf(stderr
, Name
": "
813 "clearing FAULTY flag for device %d in %s for %s\n",
814 j
, mddev
, devices
[j
].devname
);
818 fprintf(stderr
, Name
": "
819 "device %d in %s has wrong state in superblock, but %s seems ok\n",
820 i
, mddev
, devices
[j
].devname
);
824 if (!(super
.disks
[i
].i
.disk
.state
& (1 << MD_DISK_FAULTY
))) {
825 fprintf(stderr
, Name
": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
830 if (force
&& !clean
&&
831 !enough(info
.array
.level
, info
.array
.raid_disks
,
832 info
.array
.layout
, clean
,
834 change
+= st
->ss
->update_super(st
, &info
, "force-array",
835 devices
[chosen_drive
].devname
, verbose
,
842 fd
= dev_open(devices
[chosen_drive
].devname
, O_RDWR
|O_EXCL
);
844 fprintf(stderr
, Name
": Could not open %s for write - cannot Assemble array.\n",
845 devices
[chosen_drive
].devname
);
849 if (st
->ss
->store_super(st
, fd
)) {
851 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
852 devices
[chosen_drive
].devname
);
859 /* If we are in the middle of a reshape we may need to restore saved data
860 * that was moved aside due to the reshape overwriting live data
861 * The code of doing this lives in Grow.c
864 if (info
.reshape_active
) {
866 int *fdlist
= malloc(sizeof(int)* bestcnt
);
867 for (i
=0; i
<bestcnt
; i
++) {
870 fdlist
[i
] = dev_open(devices
[j
].devname
, O_RDWR
|O_EXCL
);
872 fprintf(stderr
, Name
": Could not open %s for write - cannot Assemble array.\n",
881 err
= Grow_restart(st
, &info
, fdlist
, bestcnt
, backup_file
);
884 if (fdlist
[i
]>=0) close(fdlist
[i
]);
887 fprintf(stderr
, Name
": Failed to restore critical section for reshape, sorry.\n");
893 /* count number of in-sync devices according to the superblock.
894 * We must have this number to start the array without -s or -R
896 req_cnt
= info
.array
.working_disks
;
898 /* Almost ready to actually *do* something */
902 rv
= set_array_info(mdfd
, st
, &info
);
904 fprintf(stderr
, Name
": failed to set array info for %s: %s\n",
905 mddev
, strerror(errno
));
909 if (ident
->bitmap_fd
>= 0) {
910 if (ioctl(mdfd
, SET_BITMAP_FILE
, ident
->bitmap_fd
) != 0) {
911 fprintf(stderr
, Name
": SET_BITMAP_FILE failed.\n");
915 } else if (ident
->bitmap_file
) {
916 /* From config file */
917 int bmfd
= open(ident
->bitmap_file
, O_RDWR
);
919 fprintf(stderr
, Name
": Could not open bitmap file %s\n",
924 if (ioctl(mdfd
, SET_BITMAP_FILE
, bmfd
) != 0) {
925 fprintf(stderr
, Name
": Failed to set bitmapfile for %s\n", mddev
);
933 /* First, add the raid disks, but add the chosen one last */
934 for (i
=0; i
<= bestcnt
; i
++) {
938 if (j
== chosen_drive
)
943 if (j
>= 0 /* && devices[j].uptodate */) {
944 rv
= add_disk(mdfd
, st
, &info
, &devices
[j
].i
);
947 fprintf(stderr
, Name
": failed to add "
952 if (i
< info
.array
.raid_disks
957 } else if (verbose
> 0)
958 fprintf(stderr
, Name
": added %s "
960 devices
[j
].devname
, mddev
,
961 devices
[j
].i
.disk
.raid_disk
);
962 } else if (verbose
> 0 && i
< info
.array
.raid_disks
)
963 fprintf(stderr
, Name
": no uptodate device for "
968 if (info
.array
.level
== LEVEL_CONTAINER
) {
970 fprintf(stderr
, Name
": Container %s has been "
971 "assembled with %d drive%s",
972 mddev
, okcnt
+sparecnt
, okcnt
+sparecnt
==1?"":"s");
973 if (okcnt
< info
.array
.raid_disks
)
974 fprintf(stderr
, " (out of %d)",
975 info
.array
.raid_disks
);
976 fprintf(stderr
, "\n");
984 ( enough(info
.array
.level
, info
.array
.raid_disks
,
985 info
.array
.layout
, clean
, avail
, okcnt
) &&
986 (okcnt
>= req_cnt
|| start_partial_ok
)
988 if (ioctl(mdfd
, RUN_ARRAY
, NULL
)==0) {
990 fprintf(stderr
, Name
": %s has been started with %d drive%s",
991 mddev
, okcnt
, okcnt
==1?"":"s");
992 if (okcnt
< info
.array
.raid_disks
)
993 fprintf(stderr
, " (out of %d)", info
.array
.raid_disks
);
995 fprintf(stderr
, " and %d spare%s", sparecnt
, sparecnt
==1?"":"s");
996 fprintf(stderr
, ".\n");
1001 /* There is a nasty race with 'mdadm --monitor'.
1002 * If it opens this device before we close it,
1003 * it gets an incomplete open on which IO
1004 * doesn't work and the capacity is
1006 * If we reopen (to check for layered devices)
1007 * before --monitor closes, we loose.
1009 * So: wait upto 1 second for there to be
1010 * a non-zero capacity.
1012 while (usecs
< 1000) {
1013 mdfd
= open(mddev
, O_RDONLY
);
1015 unsigned long long size
;
1016 if (get_dev_size(mdfd
, NULL
, &size
) &&
1027 fprintf(stderr
, Name
": failed to RUN_ARRAY %s: %s\n",
1028 mddev
, strerror(errno
));
1030 if (!enough(info
.array
.level
, info
.array
.raid_disks
,
1031 info
.array
.layout
, 1, avail
, okcnt
))
1032 fprintf(stderr
, Name
": Not enough devices to "
1033 "start the array.\n");
1034 else if (!enough(info
.array
.level
,
1035 info
.array
.raid_disks
,
1036 info
.array
.layout
, clean
,
1038 fprintf(stderr
, Name
": Not enough devices to "
1039 "start the array while not clean "
1040 "- consider --force.\n");
1043 ioctl(mdfd
, STOP_ARRAY
, NULL
);
1047 if (runstop
== -1) {
1048 fprintf(stderr
, Name
": %s assembled from %d drive%s",
1049 mddev
, okcnt
, okcnt
==1?"":"s");
1050 if (okcnt
!= info
.array
.raid_disks
)
1051 fprintf(stderr
, " (out of %d)", info
.array
.raid_disks
);
1052 fprintf(stderr
, ", but not started.\n");
1056 if (verbose
>= -1) {
1057 fprintf(stderr
, Name
": %s assembled from %d drive%s", mddev
, okcnt
, okcnt
==1?"":"s");
1059 fprintf(stderr
, " and %d spare%s", sparecnt
, sparecnt
==1?"":"s");
1060 if (!enough(info
.array
.level
, info
.array
.raid_disks
,
1061 info
.array
.layout
, 1, avail
, okcnt
))
1062 fprintf(stderr
, " - not enough to start the array.\n");
1063 else if (!enough(info
.array
.level
,
1064 info
.array
.raid_disks
,
1065 info
.array
.layout
, clean
,
1067 fprintf(stderr
, " - not enough to start the "
1068 "array while not clean - consider "
1071 if (req_cnt
== info
.array
.raid_disks
)
1072 fprintf(stderr
, " - need all %d to start it", req_cnt
);
1074 fprintf(stderr
, " - need %d of %d to start", req_cnt
, info
.array
.raid_disks
);
1075 fprintf(stderr
, " (use --run to insist).\n");
1079 ioctl(mdfd
, STOP_ARRAY
, NULL
);
1082 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
1083 * been updated to point to the current locations of devices.
1084 * so we can just start the array
1087 dev
= makedev(devices
[chosen_drive
].i
.disk
.major
,
1088 devices
[chosen_drive
].i
.disk
.minor
);
1089 if (ioctl(mdfd
, START_ARRAY
, dev
)) {
1090 fprintf(stderr
, Name
": Cannot start array: %s\n",