]>
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
32 static int name_matches(char *found
, char *required
, char *homehost
)
34 /* See if the name found matches the required name, possibly
35 * prefixed with 'homehost'
39 strncpy(fnd
, found
, 32);
41 if (strcmp(found
, required
)==0)
44 int l
= strlen(homehost
);
45 if (l
< 32 && fnd
[l
] == ':' &&
46 strcmp(fnd
+l
+1, required
)==0)
52 int Assemble(struct supertype
*st
, char *mddev
, int mdfd
,
53 mddev_ident_t ident
, char *conffile
,
54 mddev_dev_t devlist
, char *backup_file
,
55 int readonly
, int runstop
,
56 char *update
, char *homehost
,
57 int verbose
, int force
)
60 * The task of Assemble is to find a collection of
61 * devices that should (according to their superblocks)
62 * form an array, and to give this collection to the MD driver.
63 * In Linux-2.4 and later, this involves submitting a
64 * SET_ARRAY_INFO ioctl with no arg - to prepare
65 * the array - and then submit a number of
66 * ADD_NEW_DISK ioctls to add disks into
67 * the array. Finally RUN_ARRAY might
68 * be submitted to start the array.
70 * Much of the work of Assemble is in finding and/or
71 * checking the disks to make sure they look right.
73 * If mddev is not set, then scan must be set and we
74 * read through the config file for dev+uuid mapping
75 * We recurse, setting mddev, for each device that
77 * - has a valid uuid (or any uuid if !uuidset)
79 * If mddev is set, we try to determine state of md.
80 * check version - must be at least 0.90.0
81 * check kernel version. must be at least 2.4.
82 * If not, we can possibly fall back on START_ARRAY
83 * Try to GET_ARRAY_INFO.
84 * If possible, give up
85 * If not, try to STOP_ARRAY just to make sure
87 * If !uuidset and scan, look in conf-file for uuid
88 * If not found, give up
89 * If !devlist and scan and uuidset, get list of devs from conf-file
92 * Check superblock - discard if bad
93 * Check uuid (set if we don't have one) - discard if no match
94 * Check superblock similarity if we have a superblock - discard if different
95 * Record events, devicenum
96 * This should give us a list of devices for the array
97 * We should collect the most recent event number
99 * Count disks with recent enough event count
100 * While force && !enough disks
101 * Choose newest rejected disks, update event count
102 * mark clean and rewrite superblock
105 * foreach device with recent events : ADD_NEW_DISK
106 * if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
108 * Check the device numbers in superblock are right
109 * update superblock if any changes
116 void *first_super
= NULL
, *super
= NULL
;
119 unsigned int major
, minor
;
120 unsigned int oldmajor
, oldminor
;
127 int *best
= NULL
; /* indexed by raid_disk */
128 unsigned int bestcnt
= 0;
130 unsigned int okcnt
, sparecnt
;
131 unsigned int req_cnt
;
137 int start_partial_ok
= (runstop
>= 0) && (force
|| devlist
==NULL
|| mdfd
< 0);
138 unsigned int num_devs
;
144 if (get_linux_version() < 2004000)
148 vers
= md_get_version(mdfd
);
150 fprintf(stderr
, Name
": %s appears not to be an md device.\n", mddev
);
154 fprintf(stderr
, Name
": Assemble requires driver version 0.90.0 or later.\n"
155 " Upgrade your kernel or try --build\n");
159 if (ioctl(mdfd
, GET_ARRAY_INFO
, &info
.array
)>=0) {
160 fprintf(stderr
, Name
": device %s already active - cannot assemble it\n",
164 ioctl(mdfd
, STOP_ARRAY
, NULL
); /* just incase it was started but has no content */
167 * If any subdevs are listed, then any that don't
168 * match ident are discarded. Remainder must all match and
170 * If no subdevs, then we scan all devices in the config file, but
171 * there must be something in the identity
175 ident
->uuid_set
== 0 &&
176 ident
->super_minor
< 0 &&
177 ident
->devices
== NULL
) {
178 fprintf(stderr
, Name
": No identity information available for %s - cannot assemble.\n",
179 mddev
? mddev
: "further assembly");
183 devlist
= conf_get_devs(conffile
);
187 tmpdev
= devlist
; num_devs
= 0;
193 tmpdev
= tmpdev
->next
;
195 devices
= malloc(num_devs
* sizeof(*devices
));
197 if (!st
&& ident
->st
) st
= ident
->st
;
200 fprintf(stderr
, Name
": looking for devices for %s\n",
201 mddev
? mddev
: "further assembly");
203 /* first walk the list of devices to find a consistent set
204 * that match the criterea, if that is possible.
205 * We flag the one we like with 'used'.
207 for (tmpdev
= devlist
;
209 tmpdev
= tmpdev
->next
) {
210 char *devname
= tmpdev
->devname
;
213 struct supertype
*tst
= st
;
215 if (tmpdev
->used
> 1) continue;
217 if (ident
->devices
&&
218 !match_oneof(ident
->devices
, devname
)) {
219 if ((inargv
&& verbose
>=0) || verbose
> 0)
220 fprintf(stderr
, Name
": %s is not one of %s\n", devname
, ident
->devices
);
229 dfd
= dev_open(devname
, O_RDONLY
|O_EXCL
);
231 if ((inargv
&& verbose
>= 0) || verbose
> 0)
232 fprintf(stderr
, Name
": cannot open device %s: %s\n",
233 devname
, strerror(errno
));
235 } else if (fstat(dfd
, &stb
)< 0) {
237 fprintf(stderr
, Name
": fstat failed for %s: %s\n",
238 devname
, strerror(errno
));
240 } else if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
241 fprintf(stderr
, Name
": %s is not a block device.\n",
244 } else if (!tst
&& (tst
= guess_super(dfd
)) == NULL
) {
245 if ((inargv
&& verbose
>= 0) || verbose
> 0)
246 fprintf(stderr
, Name
": no recogniseable superblock on %s\n",
249 } else if (tst
->ss
->load_super(tst
,dfd
, &super
, NULL
)) {
250 if ((inargv
&& verbose
>= 0) || verbose
> 0)
251 fprintf( stderr
, Name
": no RAID superblock on %s\n",
254 tst
->ss
->getinfo_super(&info
, super
);
256 if (dfd
>= 0) close(dfd
);
258 if (ident
->uuid_set
&& (!update
|| strcmp(update
, "uuid")!= 0) &&
259 (!super
|| same_uuid(info
.uuid
, ident
->uuid
, tst
->ss
->swapuuid
)==0)) {
260 if ((inargv
&& verbose
>= 0) || verbose
> 0)
261 fprintf(stderr
, Name
": %s has wrong uuid.\n",
265 if (ident
->name
[0] && (!update
|| strcmp(update
, "name")!= 0) &&
266 (!super
|| name_matches(info
.name
, ident
->name
, homehost
)==0)) {
267 if ((inargv
&& verbose
>= 0) || verbose
> 0)
268 fprintf(stderr
, Name
": %s has wrong name.\n",
272 if (ident
->super_minor
!= UnSet
&&
273 (!super
|| ident
->super_minor
!= info
.array
.md_minor
)) {
274 if ((inargv
&& verbose
>= 0) || verbose
> 0)
275 fprintf(stderr
, Name
": %s has wrong super-minor.\n",
279 if (ident
->level
!= UnSet
&&
280 (!super
|| ident
->level
!= info
.array
.level
)) {
281 if ((inargv
&& verbose
>= 0) || verbose
> 0)
282 fprintf(stderr
, Name
": %s has wrong raid level.\n",
286 if (ident
->raid_disks
!= UnSet
&&
287 (!super
|| ident
->raid_disks
!= info
.array
.raid_disks
)) {
288 if ((inargv
&& verbose
>= 0) || verbose
> 0)
289 fprintf(stderr
, Name
": %s requires wrong number of drives.\n",
294 if (tst
== NULL
|| super
== NULL
)
296 if (update
== NULL
&&
297 tst
->ss
->match_home(super
, homehost
)==0) {
298 if ((inargv
&& verbose
>= 0) || verbose
> 0)
299 fprintf(stderr
, Name
": %s is not built for host %s.\n",
301 /* Auto-assemble, and this is not a usable host */
302 /* if update != NULL, we are updating the host
307 /* If we are this far, then we are nearly commited to this device.
308 * If the super_block doesn't exist, or doesn't match others,
309 * then we probably cannot continue
310 * However if one of the arrays is for the homehost, and
311 * the other isn't that can disambiguate.
315 fprintf(stderr
, Name
": %s has no superblock - assembly aborted\n",
323 if (st
->ss
!= tst
->ss
||
324 st
->minor_version
!= tst
->minor_version
||
325 st
->ss
->compare_super(&first_super
, super
) != 0) {
326 /* Some mismatch. If exactly one array matches this host,
327 * we can resolve on that one.
328 * Or, if we are auto assembling, we just ignore the second
334 int first
= st
->ss
->match_home(first_super
, homehost
);
335 int last
= tst
->ss
->match_home(super
, homehost
);
336 if (first
+last
== 1) {
337 /* We can do something */
338 if (first
) {/* just ignore this one */
339 if ((inargv
&& verbose
>= 0) || verbose
> 0)
340 fprintf(stderr
, Name
": %s misses out due to wrong homehost\n",
343 } else { /* reject all those sofar */
345 if ((inargv
&& verbose
>= 0) || verbose
> 0)
346 fprintf(stderr
, Name
": %s overrides previous devices due to good homehost\n",
348 for (td
=devlist
; td
!= tmpdev
; td
=td
->next
)
356 fprintf(stderr
, Name
": superblock on %s doesn't match others - assembly aborted\n",
367 /* So... it is up to me to open the device.
368 * We create a name '/dev/md/XXX' based on the info in the
369 * superblock, and call open_mddev on that
371 mdu_array_info_t inf
;
376 st
->ss
->getinfo_super(&info
, first_super
);
377 c
= strchr(info
.name
, ':');
378 if (c
) c
++; else c
= info
.name
;
379 asprintf(&mddev
, "/dev/md/%s", c
);
380 mdfd
= open_mddev(mddev
, ident
->autof
);
383 vers
= md_get_version(mdfd
);
384 if (ioctl(mdfd
, GET_ARRAY_INFO
, &inf
)==0) {
385 fprintf(stderr
, Name
": %s already active, cannot restart it!\n", mddev
);
393 /* Ok, no bad inconsistancy, we can try updating etc */
394 for (tmpdev
= devlist
; tmpdev
; tmpdev
=tmpdev
->next
) if (tmpdev
->used
== 1) {
395 char *devname
= tmpdev
->devname
;
397 /* looks like a good enough match to update the super block if needed */
401 /* prepare useful information in info structures */
405 if (strcmp(update
, "uuid")==0 &&
408 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
409 read(rfd
, ident
->uuid
, 16) != 16) {
410 *(__u32
*)(ident
->uuid
) = random();
411 *(__u32
*)(ident
->uuid
+1) = random();
412 *(__u32
*)(ident
->uuid
+2) = random();
413 *(__u32
*)(ident
->uuid
+3) = random();
415 if (rfd
>= 0) close(rfd
);
417 dfd
= dev_open(devname
, O_RDWR
|O_EXCL
);
424 st
->ss
->load_super(st
, dfd
, &super
, NULL
);
425 st
->ss
->getinfo_super(&info
, super
);
427 memcpy(info
.uuid
, ident
->uuid
, 16);
428 strcpy(info
.name
, ident
->name
);
429 info
.array
.md_minor
= minor(stb2
.st_rdev
);
431 st
->ss
->update_super(&info
, super
, update
, devname
, verbose
,
432 ident
->uuid_set
, homehost
);
433 if (strcmp(update
, "uuid")==0 &&
436 memcpy(ident
->uuid
, info
.uuid
, 16);
439 fprintf(stderr
, Name
": Cannot open %s for superblock update\n",
441 else if (st
->ss
->store_super(st
, dfd
, super
))
442 fprintf(stderr
, Name
": Could not re-write superblock on %s.\n",
447 if (strcmp(update
, "uuid")==0 &&
449 bitmap_update_uuid(ident
->bitmap_fd
, info
.uuid
);
454 dfd
= dev_open(devname
, O_RDWR
|O_EXCL
);
461 st
->ss
->load_super(st
, dfd
, &super
, NULL
);
462 st
->ss
->getinfo_super(&info
, super
);
469 fprintf(stderr
, Name
": %s is identified as a member of %s, slot %d.\n",
470 devname
, mddev
, info
.disk
.raid_disk
);
471 devices
[devcnt
].devname
= devname
;
472 devices
[devcnt
].major
= major(stb
.st_rdev
);
473 devices
[devcnt
].minor
= minor(stb
.st_rdev
);
474 devices
[devcnt
].oldmajor
= info
.disk
.major
;
475 devices
[devcnt
].oldminor
= info
.disk
.minor
;
476 devices
[devcnt
].events
= info
.events
;
477 devices
[devcnt
].raid_disk
= info
.disk
.raid_disk
;
478 devices
[devcnt
].disk_nr
= info
.disk
.number
;
479 devices
[devcnt
].uptodate
= 0;
480 devices
[devcnt
].state
= info
.disk
.state
;
481 if (most_recent
< devcnt
) {
482 if (devices
[devcnt
].events
483 > devices
[most_recent
].events
)
484 most_recent
= devcnt
;
486 if (info
.array
.level
== -4)
487 /* with multipath, the raid_disk from the superblock is meaningless */
490 i
= devices
[devcnt
].raid_disk
;
492 if (nextspare
< info
.array
.raid_disks
)
493 nextspare
= info
.array
.raid_disks
;
498 unsigned int newbestcnt
= i
+10;
499 int *newbest
= malloc(sizeof(int)*newbestcnt
);
501 for (c
=0; c
< newbestcnt
; c
++)
503 newbest
[c
] = best
[c
];
508 bestcnt
= newbestcnt
;
511 || devices
[best
[i
]].events
< devices
[devcnt
].events
)
521 if (update
&& strcmp(update
, "byteorder")==0)
522 st
->minor_version
= 90;
525 fprintf(stderr
, Name
": no devices found for %s\n",
528 if (must_close
) close(mdfd
);
532 st
->ss
->getinfo_super(&info
, first_super
);
534 /* now we have some devices that might be suitable.
537 avail
= malloc(info
.array
.raid_disks
);
538 memset(avail
, 0, info
.array
.raid_disks
);
541 for (i
=0; i
< bestcnt
;i
++) {
543 int event_margin
= 1; /* always allow a difference of '1'
544 * like the kernel does
547 /* note: we ignore error flags in multipath arrays
548 * as they don't make sense
550 if (info
.array
.level
!= -4)
551 if (!(devices
[j
].state
& (1<<MD_DISK_SYNC
))) {
552 if (!(devices
[j
].state
& (1<<MD_DISK_FAULTY
)))
556 if (devices
[j
].events
+event_margin
>=
557 devices
[most_recent
].events
) {
558 devices
[j
].uptodate
= 1;
559 if (i
< info
.array
.raid_disks
) {
566 while (force
&& !enough(info
.array
.level
, info
.array
.raid_disks
,
569 /* Choose the newest best drive which is
570 * not up-to-date, update the superblock
575 for (i
=0; i
<info
.array
.raid_disks
&& i
< bestcnt
; i
++) {
578 !devices
[j
].uptodate
&&
579 devices
[j
].events
> 0 &&
581 devices
[j
].events
> devices
[chosen_drive
].events
))
584 if (chosen_drive
< 0)
587 fprintf(stderr
, Name
": forcing event count in %s(%d) from %d upto %d\n",
588 devices
[chosen_drive
].devname
, devices
[chosen_drive
].raid_disk
,
589 (int)(devices
[chosen_drive
].events
),
590 (int)(devices
[most_recent
].events
));
591 fd
= dev_open(devices
[chosen_drive
].devname
, O_RDWR
|O_EXCL
);
593 fprintf(stderr
, Name
": Couldn't open %s for write - not updating\n",
594 devices
[chosen_drive
].devname
);
595 devices
[chosen_drive
].events
= 0;
598 if (st
->ss
->load_super(st
,fd
, &super
, NULL
)) {
600 fprintf(stderr
, Name
": RAID superblock disappeared from %s - not updating.\n",
601 devices
[chosen_drive
].devname
);
602 devices
[chosen_drive
].events
= 0;
605 info
.events
= devices
[most_recent
].events
;
606 st
->ss
->update_super(&info
, super
, "force", devices
[chosen_drive
].devname
, verbose
, 0, NULL
);
608 if (st
->ss
->store_super(st
, fd
, super
)) {
610 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
611 devices
[chosen_drive
].devname
);
612 devices
[chosen_drive
].events
= 0;
617 devices
[chosen_drive
].events
= devices
[most_recent
].events
;
618 devices
[chosen_drive
].uptodate
= 1;
619 avail
[chosen_drive
] = 1;
624 /* Now we want to look at the superblock which the kernel will base things on
625 * and compare the devices that we think are working with the devices that the
626 * superblock thinks are working.
627 * If there are differences and --force is given, then update this chosen
632 for (i
=0; chosen_drive
< 0 && i
<bestcnt
; i
++) {
638 if (!devices
[j
].uptodate
)
641 if ((fd
=dev_open(devices
[j
].devname
, O_RDONLY
|O_EXCL
))< 0) {
642 fprintf(stderr
, Name
": Cannot open %s: %s\n",
643 devices
[j
].devname
, strerror(errno
));
644 if (must_close
) close(mdfd
);
647 if (st
->ss
->load_super(st
,fd
, &super
, NULL
)) {
649 fprintf(stderr
, Name
": RAID superblock has disappeared from %s\n",
651 if (must_close
) close(mdfd
);
657 fprintf(stderr
, Name
": No suitable drives found for %s\n", mddev
);
658 if (must_close
) close(mdfd
);
661 st
->ss
->getinfo_super(&info
, super
);
662 for (i
=0; i
<bestcnt
; i
++) {
664 unsigned int desired_state
;
666 if (i
< info
.array
.raid_disks
)
667 desired_state
= (1<<MD_DISK_ACTIVE
) | (1<<MD_DISK_SYNC
);
673 if (!devices
[j
].uptodate
)
675 info
.disk
.number
= devices
[j
].disk_nr
;
676 info
.disk
.raid_disk
= i
;
677 info
.disk
.state
= desired_state
;
679 if (devices
[j
].uptodate
&&
680 st
->ss
->update_super(&info
, super
, "assemble", NULL
, verbose
, 0, NULL
)) {
683 fprintf(stderr
, Name
": "
684 "clearing FAULTY flag for device %d in %s for %s\n",
685 j
, mddev
, devices
[j
].devname
);
689 fprintf(stderr
, Name
": "
690 "device %d in %s has wrong state in superblock, but %s seems ok\n",
691 i
, mddev
, devices
[j
].devname
);
695 if (!devices
[j
].uptodate
&&
696 !(super
.disks
[i
].state
& (1 << MD_DISK_FAULTY
))) {
697 fprintf(stderr
, Name
": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
702 if (force
&& okcnt
== info
.array
.raid_disks
-1) {
703 /* FIXME check event count */
704 change
+= st
->ss
->update_super(&info
, super
, "force",
705 devices
[chosen_drive
].devname
, verbose
, 0, NULL
);
710 fd
= dev_open(devices
[chosen_drive
].devname
, O_RDWR
|O_EXCL
);
712 fprintf(stderr
, Name
": Could not open %s for write - cannot Assemble array.\n",
713 devices
[chosen_drive
].devname
);
714 if (must_close
) close(mdfd
);
717 if (st
->ss
->store_super(st
, fd
, super
)) {
719 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
720 devices
[chosen_drive
].devname
);
721 if (must_close
) close(mdfd
);
727 /* If we are in the middle of a reshape we may need to restore saved data
728 * that was moved aside due to the reshape overwriting live data
729 * The code of doing this lives in Grow.c
732 if (info
.reshape_active
) {
734 int *fdlist
= malloc(sizeof(int)* bestcnt
);
735 for (i
=0; i
<bestcnt
; i
++) {
738 fdlist
[i
] = dev_open(devices
[j
].devname
, O_RDWR
|O_EXCL
);
740 fprintf(stderr
, Name
": Could not open %s for write - cannot Assemble array.\n",
749 err
= Grow_restart(st
, &info
, fdlist
, bestcnt
, backup_file
);
752 if (fdlist
[i
]>=0) close(fdlist
[i
]);
755 fprintf(stderr
, Name
": Failed to restore critical section for reshape, sorry.\n");
756 if (must_close
) close(mdfd
);
761 /* count number of in-sync devices according to the superblock.
762 * We must have this number to start the array without -s or -R
764 req_cnt
= info
.array
.working_disks
;
766 /* Almost ready to actually *do* something */
769 if ((vers
% 100) >= 1) { /* can use different versions */
770 mdu_array_info_t inf
;
771 memset(&inf
, 0, sizeof(inf
));
772 inf
.major_version
= st
->ss
->major
;
773 inf
.minor_version
= st
->minor_version
;
774 rv
= ioctl(mdfd
, SET_ARRAY_INFO
, &inf
);
776 rv
= ioctl(mdfd
, SET_ARRAY_INFO
, NULL
);
779 fprintf(stderr
, Name
": SET_ARRAY_INFO failed for %s: %s\n",
780 mddev
, strerror(errno
));
781 if (must_close
) close(mdfd
);
784 if (ident
->bitmap_fd
>= 0) {
785 if (ioctl(mdfd
, SET_BITMAP_FILE
, ident
->bitmap_fd
) != 0) {
786 fprintf(stderr
, Name
": SET_BITMAP_FILE failed.\n");
787 if (must_close
) close(mdfd
);
790 } else if (ident
->bitmap_file
) {
791 /* From config file */
792 int bmfd
= open(ident
->bitmap_file
, O_RDWR
);
794 fprintf(stderr
, Name
": Could not open bitmap file %s\n",
796 if (must_close
) close(mdfd
);
799 if (ioctl(mdfd
, SET_BITMAP_FILE
, bmfd
) != 0) {
800 fprintf(stderr
, Name
": Failed to set bitmapfile for %s\n", mddev
);
802 if (must_close
) close(mdfd
);
808 /* First, add the raid disks, but add the chosen one last */
809 for (i
=0; i
<= bestcnt
; i
++) {
813 if (j
== chosen_drive
)
818 if (j
>= 0 /* && devices[j].uptodate */) {
819 mdu_disk_info_t disk
;
820 memset(&disk
, 0, sizeof(disk
));
821 disk
.major
= devices
[j
].major
;
822 disk
.minor
= devices
[j
].minor
;
823 if (ioctl(mdfd
, ADD_NEW_DISK
, &disk
)!=0) {
824 fprintf(stderr
, Name
": failed to add %s to %s: %s\n",
828 if (i
< info
.array
.raid_disks
|| i
== bestcnt
)
832 } else if (verbose
> 0)
833 fprintf(stderr
, Name
": added %s to %s as %d\n",
834 devices
[j
].devname
, mddev
, devices
[j
].raid_disk
);
835 } else if (verbose
> 0 && i
< info
.array
.raid_disks
)
836 fprintf(stderr
, Name
": no uptodate device for slot %d of %s\n",
842 ( enough(info
.array
.level
, info
.array
.raid_disks
, info
.array
.layout
, avail
, okcnt
) &&
843 (okcnt
>= req_cnt
|| start_partial_ok
)
845 if (ioctl(mdfd
, RUN_ARRAY
, NULL
)==0) {
847 fprintf(stderr
, Name
": %s has been started with %d drive%s",
848 mddev
, okcnt
, okcnt
==1?"":"s");
849 if (okcnt
< info
.array
.raid_disks
)
850 fprintf(stderr
, " (out of %d)", info
.array
.raid_disks
);
852 fprintf(stderr
, " and %d spare%s", sparecnt
, sparecnt
==1?"":"s");
853 fprintf(stderr
, ".\n");
858 /* There is a nasty race with 'mdadm --monitor'.
859 * If it opens this device before we close it,
860 * it gets an incomplete open on which IO
861 * doesn't work and the capacity if wrong.
862 * If we reopen (to check for layered devices)
863 * before --monitor closes, we loose.
865 * So: wait upto 1 second for there to be
866 * a non-zero capacity.
868 while (usecs
< 1000) {
869 mdfd
= open(mddev
, O_RDONLY
);
872 if (ioctl(mdfd
, BLKGETSIZE
, &size
) == 0 &&
883 fprintf(stderr
, Name
": failed to RUN_ARRAY %s: %s\n",
884 mddev
, strerror(errno
));
885 if (must_close
) close(mdfd
);
889 fprintf(stderr
, Name
": %s assembled from %d drive%s",
890 mddev
, okcnt
, okcnt
==1?"":"s");
891 if (okcnt
!= info
.array
.raid_disks
)
892 fprintf(stderr
, " (out of %d)", info
.array
.raid_disks
);
893 fprintf(stderr
, ", but not started.\n");
894 if (must_close
) close(mdfd
);
898 fprintf(stderr
, Name
": %s assembled from %d drive%s", mddev
, okcnt
, okcnt
==1?"":"s");
900 fprintf(stderr
, " and %d spare%s", sparecnt
, sparecnt
==1?"":"s");
901 if (!enough(info
.array
.level
, info
.array
.raid_disks
, info
.array
.layout
, avail
, okcnt
))
902 fprintf(stderr
, " - not enough to start the array.\n");
904 if (req_cnt
== info
.array
.raid_disks
)
905 fprintf(stderr
, " - need all %d to start it", req_cnt
);
907 fprintf(stderr
, " - need %d of %d to start", req_cnt
, info
.array
.raid_disks
);
908 fprintf(stderr
, " (use --run to insist).\n");
911 if (must_close
) close(mdfd
);
914 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
915 * been updated to point to the current locations of devices.
916 * so we can just start the array
919 dev
= makedev(devices
[chosen_drive
].major
,
920 devices
[chosen_drive
].minor
);
921 if (ioctl(mdfd
, START_ARRAY
, dev
)) {
922 fprintf(stderr
, Name
": Cannot start array: %s\n",
927 if (must_close
) close(mdfd
);