]>
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
, int mdfd
,
54 mddev_ident_t ident
, char *conffile
,
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 vers
= 0; /* Keep gcc quite - it really is initialised */
117 void *first_super
= NULL
, *super
= NULL
;
120 unsigned int major
, minor
;
121 unsigned int oldmajor
, oldminor
;
128 int *best
= NULL
; /* indexed by raid_disk */
129 unsigned int bestcnt
= 0;
131 unsigned int okcnt
, sparecnt
;
132 unsigned int req_cnt
;
138 int start_partial_ok
= (runstop
>= 0) && (force
|| devlist
==NULL
|| mdfd
< 0);
139 unsigned int num_devs
;
145 if (get_linux_version() < 2004000)
149 vers
= md_get_version(mdfd
);
151 fprintf(stderr
, Name
": %s appears not to be an md device.\n", mddev
);
155 fprintf(stderr
, Name
": Assemble requires driver version 0.90.0 or later.\n"
156 " Upgrade your kernel or try --build\n");
160 if (ioctl(mdfd
, GET_ARRAY_INFO
, &info
.array
)>=0) {
161 fprintf(stderr
, Name
": device %s already active - cannot assemble it\n",
165 ioctl(mdfd
, STOP_ARRAY
, NULL
); /* just incase it was started but has no content */
168 * If any subdevs are listed, then any that don't
169 * match ident are discarded. Remainder must all match and
171 * If no subdevs, then we scan all devices in the config file, but
172 * there must be something in the identity
176 ident
->uuid_set
== 0 &&
177 ident
->super_minor
< 0 &&
178 ident
->devices
== NULL
) {
179 fprintf(stderr
, Name
": No identity information available for %s - cannot assemble.\n",
180 mddev
? mddev
: "further assembly");
184 devlist
= conf_get_devs(conffile
);
188 tmpdev
= devlist
; num_devs
= 0;
194 tmpdev
= tmpdev
->next
;
196 devices
= malloc(num_devs
* sizeof(*devices
));
198 if (!st
&& ident
->st
) st
= ident
->st
;
201 fprintf(stderr
, Name
": looking for devices for %s\n",
202 mddev
? mddev
: "further assembly");
204 /* first walk the list of devices to find a consistent set
205 * that match the criterea, if that is possible.
206 * We flag the one we like with 'used'.
208 for (tmpdev
= devlist
;
210 tmpdev
= tmpdev
->next
) {
211 char *devname
= tmpdev
->devname
;
214 struct supertype
*tst
= st
;
216 if (tmpdev
->used
> 1) continue;
218 if (ident
->devices
&&
219 !match_oneof(ident
->devices
, devname
)) {
220 if ((inargv
&& verbose
>=0) || verbose
> 0)
221 fprintf(stderr
, Name
": %s is not one of %s\n", devname
, ident
->devices
);
230 dfd
= dev_open(devname
, O_RDONLY
|O_EXCL
);
232 if ((inargv
&& verbose
>= 0) || verbose
> 0)
233 fprintf(stderr
, Name
": cannot open device %s: %s\n",
234 devname
, strerror(errno
));
236 } else if (fstat(dfd
, &stb
)< 0) {
238 fprintf(stderr
, Name
": fstat failed for %s: %s\n",
239 devname
, strerror(errno
));
241 } else if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
242 fprintf(stderr
, Name
": %s is not a block device.\n",
245 } else if (!tst
&& (tst
= guess_super(dfd
)) == NULL
) {
246 if ((inargv
&& verbose
>= 0) || verbose
> 0)
247 fprintf(stderr
, Name
": no recogniseable superblock on %s\n",
250 } else if (tst
->ss
->load_super(tst
,dfd
, &super
, NULL
)) {
251 if ((inargv
&& verbose
>= 0) || verbose
> 0)
252 fprintf( stderr
, Name
": no RAID superblock on %s\n",
255 tst
->ss
->getinfo_super(&info
, super
);
257 if (dfd
>= 0) close(dfd
);
259 if (ident
->uuid_set
&& (!update
|| strcmp(update
, "uuid")!= 0) &&
260 (!super
|| same_uuid(info
.uuid
, ident
->uuid
, tst
->ss
->swapuuid
)==0)) {
261 if ((inargv
&& verbose
>= 0) || verbose
> 0)
262 fprintf(stderr
, Name
": %s has wrong uuid.\n",
266 if (ident
->name
[0] && (!update
|| strcmp(update
, "name")!= 0) &&
267 (!super
|| name_matches(info
.name
, ident
->name
, homehost
)==0)) {
268 if ((inargv
&& verbose
>= 0) || verbose
> 0)
269 fprintf(stderr
, Name
": %s has wrong name.\n",
273 if (ident
->super_minor
!= UnSet
&&
274 (!super
|| ident
->super_minor
!= info
.array
.md_minor
)) {
275 if ((inargv
&& verbose
>= 0) || verbose
> 0)
276 fprintf(stderr
, Name
": %s has wrong super-minor.\n",
280 if (ident
->level
!= UnSet
&&
281 (!super
|| ident
->level
!= info
.array
.level
)) {
282 if ((inargv
&& verbose
>= 0) || verbose
> 0)
283 fprintf(stderr
, Name
": %s has wrong raid level.\n",
287 if (ident
->raid_disks
!= UnSet
&&
288 (!super
|| ident
->raid_disks
!= info
.array
.raid_disks
)) {
289 if ((inargv
&& verbose
>= 0) || verbose
> 0)
290 fprintf(stderr
, Name
": %s requires wrong number of drives.\n",
295 if (tst
== NULL
|| super
== NULL
)
297 if (update
== NULL
&&
298 tst
->ss
->match_home(super
, homehost
)==0) {
299 if ((inargv
&& verbose
>= 0) || verbose
> 0)
300 fprintf(stderr
, Name
": %s is not built for host %s.\n",
302 /* Auto-assemble, and this is not a usable host */
303 /* if update != NULL, we are updating the host
308 /* If we are this far, then we are nearly commited to this device.
309 * If the super_block doesn't exist, or doesn't match others,
310 * then we probably cannot continue
311 * However if one of the arrays is for the homehost, and
312 * the other isn't that can disambiguate.
316 fprintf(stderr
, Name
": %s has no superblock - assembly aborted\n",
324 if (st
->ss
!= tst
->ss
||
325 st
->minor_version
!= tst
->minor_version
||
326 st
->ss
->compare_super(&first_super
, super
) != 0) {
327 /* Some mismatch. If exactly one array matches this host,
328 * we can resolve on that one.
329 * Or, if we are auto assembling, we just ignore the second
335 int first
= st
->ss
->match_home(first_super
, homehost
);
336 int last
= tst
->ss
->match_home(super
, homehost
);
337 if (first
+last
== 1) {
338 /* We can do something */
339 if (first
) {/* just ignore this one */
340 if ((inargv
&& verbose
>= 0) || verbose
> 0)
341 fprintf(stderr
, Name
": %s misses out due to wrong homehost\n",
344 } else { /* reject all those sofar */
346 if ((inargv
&& verbose
>= 0) || verbose
> 0)
347 fprintf(stderr
, Name
": %s overrides previous devices due to good homehost\n",
349 for (td
=devlist
; td
!= tmpdev
; td
=td
->next
)
357 fprintf(stderr
, Name
": superblock on %s doesn't match others - assembly aborted\n",
368 /* So... it is up to me to open the device.
369 * We create a name '/dev/md/XXX' based on the info in the
370 * superblock, and call open_mddev on that
372 mdu_array_info_t inf
;
377 st
->ss
->getinfo_super(&info
, first_super
);
378 c
= strchr(info
.name
, ':');
379 if (c
) c
++; else c
= info
.name
;
380 if (isdigit(*c
) && ((ident
->autof
& 7)==4 || (ident
->autof
&7)==6))
381 /* /dev/md/d0 style for partitionable */
382 asprintf(&mddev
, "/dev/md/d%s", c
);
384 asprintf(&mddev
, "/dev/md/%s", c
);
385 mdfd
= open_mddev(mddev
, ident
->autof
);
388 vers
= md_get_version(mdfd
);
389 if (ioctl(mdfd
, GET_ARRAY_INFO
, &inf
)==0) {
390 fprintf(stderr
, Name
": %s already active, cannot restart it!\n", mddev
);
398 /* Ok, no bad inconsistancy, we can try updating etc */
399 for (tmpdev
= devlist
; tmpdev
; tmpdev
=tmpdev
->next
) if (tmpdev
->used
== 1) {
400 char *devname
= tmpdev
->devname
;
402 /* looks like a good enough match to update the super block if needed */
406 /* prepare useful information in info structures */
410 if (strcmp(update
, "uuid")==0 &&
413 if ((rfd
= open("/dev/urandom", O_RDONLY
)) < 0 ||
414 read(rfd
, ident
->uuid
, 16) != 16) {
415 *(__u32
*)(ident
->uuid
) = random();
416 *(__u32
*)(ident
->uuid
+1) = random();
417 *(__u32
*)(ident
->uuid
+2) = random();
418 *(__u32
*)(ident
->uuid
+3) = random();
420 if (rfd
>= 0) close(rfd
);
422 dfd
= dev_open(devname
, O_RDWR
|O_EXCL
);
429 st
->ss
->load_super(st
, dfd
, &super
, NULL
);
430 st
->ss
->getinfo_super(&info
, super
);
432 memcpy(info
.uuid
, ident
->uuid
, 16);
433 strcpy(info
.name
, ident
->name
);
434 info
.array
.md_minor
= minor(stb2
.st_rdev
);
436 st
->ss
->update_super(&info
, super
, update
, devname
, verbose
,
437 ident
->uuid_set
, homehost
);
438 if (strcmp(update
, "uuid")==0 &&
441 memcpy(ident
->uuid
, info
.uuid
, 16);
444 fprintf(stderr
, Name
": Cannot open %s for superblock update\n",
446 else if (st
->ss
->store_super(st
, dfd
, super
))
447 fprintf(stderr
, Name
": Could not re-write superblock on %s.\n",
452 if (strcmp(update
, "uuid")==0 &&
454 bitmap_update_uuid(ident
->bitmap_fd
, info
.uuid
);
459 dfd
= dev_open(devname
, O_RDWR
|O_EXCL
);
466 st
->ss
->load_super(st
, dfd
, &super
, NULL
);
467 st
->ss
->getinfo_super(&info
, super
);
474 fprintf(stderr
, Name
": %s is identified as a member of %s, slot %d.\n",
475 devname
, mddev
, info
.disk
.raid_disk
);
476 devices
[devcnt
].devname
= devname
;
477 devices
[devcnt
].major
= major(stb
.st_rdev
);
478 devices
[devcnt
].minor
= minor(stb
.st_rdev
);
479 devices
[devcnt
].oldmajor
= info
.disk
.major
;
480 devices
[devcnt
].oldminor
= info
.disk
.minor
;
481 devices
[devcnt
].events
= info
.events
;
482 devices
[devcnt
].raid_disk
= info
.disk
.raid_disk
;
483 devices
[devcnt
].disk_nr
= info
.disk
.number
;
484 devices
[devcnt
].uptodate
= 0;
485 devices
[devcnt
].state
= info
.disk
.state
;
486 if (most_recent
< devcnt
) {
487 if (devices
[devcnt
].events
488 > devices
[most_recent
].events
)
489 most_recent
= devcnt
;
491 if (info
.array
.level
== -4)
492 /* with multipath, the raid_disk from the superblock is meaningless */
495 i
= devices
[devcnt
].raid_disk
;
497 if (nextspare
< info
.array
.raid_disks
)
498 nextspare
= info
.array
.raid_disks
;
503 unsigned int newbestcnt
= i
+10;
504 int *newbest
= malloc(sizeof(int)*newbestcnt
);
506 for (c
=0; c
< newbestcnt
; c
++)
508 newbest
[c
] = best
[c
];
513 bestcnt
= newbestcnt
;
516 || devices
[best
[i
]].events
< devices
[devcnt
].events
)
526 if (update
&& strcmp(update
, "byteorder")==0)
527 st
->minor_version
= 90;
530 fprintf(stderr
, Name
": no devices found for %s\n",
533 if (must_close
) close(mdfd
);
537 st
->ss
->getinfo_super(&info
, first_super
);
539 /* now we have some devices that might be suitable.
542 avail
= malloc(info
.array
.raid_disks
);
543 memset(avail
, 0, info
.array
.raid_disks
);
546 for (i
=0; i
< bestcnt
;i
++) {
548 int event_margin
= 1; /* always allow a difference of '1'
549 * like the kernel does
552 /* note: we ignore error flags in multipath arrays
553 * as they don't make sense
555 if (info
.array
.level
!= -4)
556 if (!(devices
[j
].state
& (1<<MD_DISK_SYNC
))) {
557 if (!(devices
[j
].state
& (1<<MD_DISK_FAULTY
)))
561 if (devices
[j
].events
+event_margin
>=
562 devices
[most_recent
].events
) {
563 devices
[j
].uptodate
= 1;
564 if (i
< info
.array
.raid_disks
) {
571 while (force
&& !enough(info
.array
.level
, info
.array
.raid_disks
,
574 /* Choose the newest best drive which is
575 * not up-to-date, update the superblock
580 for (i
=0; i
<info
.array
.raid_disks
&& i
< bestcnt
; i
++) {
583 !devices
[j
].uptodate
&&
584 devices
[j
].events
> 0 &&
586 devices
[j
].events
> devices
[chosen_drive
].events
))
589 if (chosen_drive
< 0)
592 fprintf(stderr
, Name
": forcing event count in %s(%d) from %d upto %d\n",
593 devices
[chosen_drive
].devname
, devices
[chosen_drive
].raid_disk
,
594 (int)(devices
[chosen_drive
].events
),
595 (int)(devices
[most_recent
].events
));
596 fd
= dev_open(devices
[chosen_drive
].devname
, O_RDWR
|O_EXCL
);
598 fprintf(stderr
, Name
": Couldn't open %s for write - not updating\n",
599 devices
[chosen_drive
].devname
);
600 devices
[chosen_drive
].events
= 0;
603 if (st
->ss
->load_super(st
,fd
, &super
, NULL
)) {
605 fprintf(stderr
, Name
": RAID superblock disappeared from %s - not updating.\n",
606 devices
[chosen_drive
].devname
);
607 devices
[chosen_drive
].events
= 0;
610 info
.events
= devices
[most_recent
].events
;
611 st
->ss
->update_super(&info
, super
, "force", devices
[chosen_drive
].devname
, verbose
, 0, NULL
);
613 if (st
->ss
->store_super(st
, fd
, super
)) {
615 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
616 devices
[chosen_drive
].devname
);
617 devices
[chosen_drive
].events
= 0;
622 devices
[chosen_drive
].events
= devices
[most_recent
].events
;
623 devices
[chosen_drive
].uptodate
= 1;
624 avail
[chosen_drive
] = 1;
629 /* Now we want to look at the superblock which the kernel will base things on
630 * and compare the devices that we think are working with the devices that the
631 * superblock thinks are working.
632 * If there are differences and --force is given, then update this chosen
637 for (i
=0; chosen_drive
< 0 && i
<bestcnt
; i
++) {
643 if (!devices
[j
].uptodate
)
646 if ((fd
=dev_open(devices
[j
].devname
, O_RDONLY
|O_EXCL
))< 0) {
647 fprintf(stderr
, Name
": Cannot open %s: %s\n",
648 devices
[j
].devname
, strerror(errno
));
649 if (must_close
) close(mdfd
);
652 if (st
->ss
->load_super(st
,fd
, &super
, NULL
)) {
654 fprintf(stderr
, Name
": RAID superblock has disappeared from %s\n",
656 if (must_close
) close(mdfd
);
662 fprintf(stderr
, Name
": No suitable drives found for %s\n", mddev
);
663 if (must_close
) close(mdfd
);
666 st
->ss
->getinfo_super(&info
, super
);
667 for (i
=0; i
<bestcnt
; i
++) {
669 unsigned int desired_state
;
671 if (i
< info
.array
.raid_disks
)
672 desired_state
= (1<<MD_DISK_ACTIVE
) | (1<<MD_DISK_SYNC
);
678 if (!devices
[j
].uptodate
)
680 info
.disk
.number
= devices
[j
].disk_nr
;
681 info
.disk
.raid_disk
= i
;
682 info
.disk
.state
= desired_state
;
684 if (devices
[j
].uptodate
&&
685 st
->ss
->update_super(&info
, super
, "assemble", NULL
, verbose
, 0, NULL
)) {
688 fprintf(stderr
, Name
": "
689 "clearing FAULTY flag for device %d in %s for %s\n",
690 j
, mddev
, devices
[j
].devname
);
694 fprintf(stderr
, Name
": "
695 "device %d in %s has wrong state in superblock, but %s seems ok\n",
696 i
, mddev
, devices
[j
].devname
);
700 if (!devices
[j
].uptodate
&&
701 !(super
.disks
[i
].state
& (1 << MD_DISK_FAULTY
))) {
702 fprintf(stderr
, Name
": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
707 if (force
&& okcnt
== info
.array
.raid_disks
-1) {
708 /* FIXME check event count */
709 change
+= st
->ss
->update_super(&info
, super
, "force",
710 devices
[chosen_drive
].devname
, verbose
, 0, NULL
);
715 fd
= dev_open(devices
[chosen_drive
].devname
, O_RDWR
|O_EXCL
);
717 fprintf(stderr
, Name
": Could not open %s for write - cannot Assemble array.\n",
718 devices
[chosen_drive
].devname
);
719 if (must_close
) close(mdfd
);
722 if (st
->ss
->store_super(st
, fd
, super
)) {
724 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
725 devices
[chosen_drive
].devname
);
726 if (must_close
) close(mdfd
);
732 /* If we are in the middle of a reshape we may need to restore saved data
733 * that was moved aside due to the reshape overwriting live data
734 * The code of doing this lives in Grow.c
737 if (info
.reshape_active
) {
739 int *fdlist
= malloc(sizeof(int)* bestcnt
);
740 for (i
=0; i
<bestcnt
; i
++) {
743 fdlist
[i
] = dev_open(devices
[j
].devname
, O_RDWR
|O_EXCL
);
745 fprintf(stderr
, Name
": Could not open %s for write - cannot Assemble array.\n",
754 err
= Grow_restart(st
, &info
, fdlist
, bestcnt
, backup_file
);
757 if (fdlist
[i
]>=0) close(fdlist
[i
]);
760 fprintf(stderr
, Name
": Failed to restore critical section for reshape, sorry.\n");
761 if (must_close
) close(mdfd
);
766 /* count number of in-sync devices according to the superblock.
767 * We must have this number to start the array without -s or -R
769 req_cnt
= info
.array
.working_disks
;
771 /* Almost ready to actually *do* something */
774 if ((vers
% 100) >= 1) { /* can use different versions */
775 mdu_array_info_t inf
;
776 memset(&inf
, 0, sizeof(inf
));
777 inf
.major_version
= st
->ss
->major
;
778 inf
.minor_version
= st
->minor_version
;
779 rv
= ioctl(mdfd
, SET_ARRAY_INFO
, &inf
);
781 rv
= ioctl(mdfd
, SET_ARRAY_INFO
, NULL
);
784 fprintf(stderr
, Name
": SET_ARRAY_INFO failed for %s: %s\n",
785 mddev
, strerror(errno
));
786 if (must_close
) close(mdfd
);
789 if (ident
->bitmap_fd
>= 0) {
790 if (ioctl(mdfd
, SET_BITMAP_FILE
, ident
->bitmap_fd
) != 0) {
791 fprintf(stderr
, Name
": SET_BITMAP_FILE failed.\n");
792 if (must_close
) close(mdfd
);
795 } else if (ident
->bitmap_file
) {
796 /* From config file */
797 int bmfd
= open(ident
->bitmap_file
, O_RDWR
);
799 fprintf(stderr
, Name
": Could not open bitmap file %s\n",
801 if (must_close
) close(mdfd
);
804 if (ioctl(mdfd
, SET_BITMAP_FILE
, bmfd
) != 0) {
805 fprintf(stderr
, Name
": Failed to set bitmapfile for %s\n", mddev
);
807 if (must_close
) close(mdfd
);
813 /* First, add the raid disks, but add the chosen one last */
814 for (i
=0; i
<= bestcnt
; i
++) {
818 if (j
== chosen_drive
)
823 if (j
>= 0 /* && devices[j].uptodate */) {
824 mdu_disk_info_t disk
;
825 memset(&disk
, 0, sizeof(disk
));
826 disk
.major
= devices
[j
].major
;
827 disk
.minor
= devices
[j
].minor
;
828 if (ioctl(mdfd
, ADD_NEW_DISK
, &disk
)!=0) {
829 fprintf(stderr
, Name
": failed to add %s to %s: %s\n",
833 if (i
< info
.array
.raid_disks
|| i
== bestcnt
)
837 } else if (verbose
> 0)
838 fprintf(stderr
, Name
": added %s to %s as %d\n",
839 devices
[j
].devname
, mddev
, devices
[j
].raid_disk
);
840 } else if (verbose
> 0 && i
< info
.array
.raid_disks
)
841 fprintf(stderr
, Name
": no uptodate device for slot %d of %s\n",
847 ( enough(info
.array
.level
, info
.array
.raid_disks
, info
.array
.layout
, avail
, okcnt
) &&
848 (okcnt
>= req_cnt
|| start_partial_ok
)
850 if (ioctl(mdfd
, RUN_ARRAY
, NULL
)==0) {
852 fprintf(stderr
, Name
": %s has been started with %d drive%s",
853 mddev
, okcnt
, okcnt
==1?"":"s");
854 if (okcnt
< info
.array
.raid_disks
)
855 fprintf(stderr
, " (out of %d)", info
.array
.raid_disks
);
857 fprintf(stderr
, " and %d spare%s", sparecnt
, sparecnt
==1?"":"s");
858 fprintf(stderr
, ".\n");
863 /* There is a nasty race with 'mdadm --monitor'.
864 * If it opens this device before we close it,
865 * it gets an incomplete open on which IO
866 * doesn't work and the capacity if wrong.
867 * If we reopen (to check for layered devices)
868 * before --monitor closes, we loose.
870 * So: wait upto 1 second for there to be
871 * a non-zero capacity.
873 while (usecs
< 1000) {
874 mdfd
= open(mddev
, O_RDONLY
);
877 if (ioctl(mdfd
, BLKGETSIZE
, &size
) == 0 &&
888 fprintf(stderr
, Name
": failed to RUN_ARRAY %s: %s\n",
889 mddev
, strerror(errno
));
890 if (must_close
) close(mdfd
);
894 fprintf(stderr
, Name
": %s assembled from %d drive%s",
895 mddev
, okcnt
, okcnt
==1?"":"s");
896 if (okcnt
!= info
.array
.raid_disks
)
897 fprintf(stderr
, " (out of %d)", info
.array
.raid_disks
);
898 fprintf(stderr
, ", but not started.\n");
899 if (must_close
) close(mdfd
);
903 fprintf(stderr
, Name
": %s assembled from %d drive%s", mddev
, okcnt
, okcnt
==1?"":"s");
905 fprintf(stderr
, " and %d spare%s", sparecnt
, sparecnt
==1?"":"s");
906 if (!enough(info
.array
.level
, info
.array
.raid_disks
, info
.array
.layout
, avail
, okcnt
))
907 fprintf(stderr
, " - not enough to start the array.\n");
909 if (req_cnt
== info
.array
.raid_disks
)
910 fprintf(stderr
, " - need all %d to start it", req_cnt
);
912 fprintf(stderr
, " - need %d of %d to start", req_cnt
, info
.array
.raid_disks
);
913 fprintf(stderr
, " (use --run to insist).\n");
916 if (must_close
) close(mdfd
);
919 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
920 * been updated to point to the current locations of devices.
921 * so we can just start the array
924 dev
= makedev(devices
[chosen_drive
].major
,
925 devices
[chosen_drive
].minor
);
926 if (ioctl(mdfd
, START_ARRAY
, dev
)) {
927 fprintf(stderr
, Name
": Cannot start array: %s\n",
932 if (must_close
) close(mdfd
);