]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - Assemble.c
2 * mdadm - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
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
34 int Assemble(char *mddev
, int mdfd
,
35 mddev_ident_t ident
, char *conffile
,
37 int readonly
, int runstop
,
38 int verbose
, int force
)
41 * The task of Assemble is to find a collection of
42 * devices that should (according to their superblocks)
43 * form an array, and to give this collection to the MD driver.
44 * In Linux-2.4 and later, this involves submitting a
45 * SET_ARRAY_INFO ioctl with no arg - to prepare
46 * the array - and then submit a number of
47 * ADD_NEW_DISK ioctls to add disks into
48 * the array. Finally RUN_ARRAY might
49 * be submitted to start the array.
51 * Much of the work of Assemble is in finding and/or
52 * checking the disks to make sure they look right.
54 * If mddev is not set, then scan must be and we
55 * read through the config file for dev+uuid mapping
56 * We recurse, setting mddev, for each device that
58 * - has a valid uuid (or any uuid if !uuidset
60 * If mddev is set, we try to determine state of md.
61 * check version - must be at least 0.90.0
62 * check kernel version. must be at least 2.4.
63 * If not, we can possibly fall back on START_ARRAY
64 * Try to GET_ARRAY_INFO.
65 * If possible, give up
66 * If not, try to STOP_ARRAY just to make sure
68 * If !uuidset and scan, look in conf-file for uuid
69 * If not found, give up
70 * If !devlist and scan and uuidset, get list of devs from conf-file
73 * Check superblock - discard if bad
74 * Check uuid (set if we don't have one) - discard if no match
75 * Check superblock similarity if we have a superbloc - discard if different
76 * Record events, devicenum, utime
77 * This should give us a list of devices for the array
78 * We should collect the most recent event and utime numbers
80 * Count disks with recent enough event count
81 * While force && !enough disks
82 * Choose newest rejected disks, update event count
83 * mark clean and rewrite superblock
86 * foreach device with recent events : ADD_NEW_DISK
87 * if runstop == 1 || "enough" disks and runstop==0 -> RUN_ARRAY
89 * Check the device numbers in superblock are right
90 * update superblock if any changes
96 mdu_array_info_t array
;
97 mdp_super_t first_super
, super
;
105 } devices
[MD_SB_DISKS
];
106 int best
[MD_SB_DISKS
]; /* indexed by raid_disk */
107 int devcnt
= 0, okcnt
, sparecnt
;
113 int start_partial_ok
= force
|| devlist
==NULL
;
115 vers
= md_get_version(mdfd
);
117 fprintf(stderr
, Name
": %s appears not to be an md device.\n");
121 fprintf(stderr
, Name
": Assemble requires driver version 0.90.0 or later.\n"
122 " Upgrade your kernel or try --build\n");
125 if (get_linux_version() < 2004000)
128 if (ioctl(mdfd
, GET_ARRAY_INFO
, &array
)>=0) {
129 fprintf(stderr
, Name
": device %s already active - cannot assemble it\n",
133 ioctl(mdfd
, STOP_ARRAY
, NULL
); /* just incase it was started but has no content */
136 * If any subdevs are listed, then any that don't
137 * match ident are discarded. Remainder must all match and
139 * If no subdevs, then we scan all devices in the config file, but
140 * there must be something in the identity
144 ident
->uuid_set
== 0 &&
145 ident
->super_minor
< 0 &&
146 ident
->devices
== NULL
) {
147 fprintf(stderr
, Name
": No identity information available for %s - cannot assemble.\n",
152 devlist
= conf_get_devs(conffile
);
155 first_super
.md_magic
= 0;
156 for (i
=0; i
<MD_SB_DISKS
; i
++)
160 fprintf(stderr
, Name
": looking for devices for %s\n",
170 devname
= devlist
->devname
;
171 devlist
= devlist
->next
;
173 if (ident
->devices
&&
174 !match_oneof(ident
->devices
, devname
))
177 dfd
= open(devname
, O_RDONLY
, 0);
179 if (inargv
|| verbose
)
180 fprintf(stderr
, Name
": cannot open device %s: %s\n",
181 devname
, strerror(errno
));
182 } else if (fstat(dfd
, &stb
)< 0) {
184 fprintf(stderr
, Name
": fstat failed for %s: %s\n",
185 devname
, strerror(errno
));
187 } else if ((stb
.st_mode
& S_IFMT
) != S_IFBLK
) {
188 fprintf(stderr
, Name
": %s is not a block device.\n",
191 } else if (load_super(dfd
, &super
)) {
192 if (inargv
|| verbose
)
193 fprintf( stderr
, Name
": no RAID superblock on %s\n",
198 uuid_from_super(this_uuid
, &super
);
202 if (ident
->uuid_set
&&
203 (!havesuper
|| same_uuid(this_uuid
, ident
->uuid
)==0)) {
204 if (inargv
|| verbose
)
205 fprintf(stderr
, Name
": %s has wrong uuid.\n",
209 if (ident
->super_minor
>= 0 &&
210 (!havesuper
|| ident
->super_minor
!= super
.md_minor
)) {
211 if (inargv
|| verbose
)
212 fprintf(stderr
, Name
": %s has wrong super-minor.\n",
216 if (ident
->level
!= -10 &&
217 (!havesuper
|| ident
->level
!= super
.level
)) {
218 if (inargv
|| verbose
)
219 fprintf(stderr
, Name
": %s has wrong raid level.\n",
223 if (ident
->raid_disks
!= -1 &&
224 (!havesuper
|| ident
->raid_disks
!= super
.raid_disks
)) {
225 if (inargv
|| verbose
)
226 fprintf(stderr
, Name
": %s requires wrong number of drives.\n",
231 /* If we are this far, then we are commited to this device.
232 * If the super_block doesn't exist, or doesn't match others,
233 * then we cannot continue
237 fprintf(stderr
, Name
": %s has no superblock - assembly aborted\n",
241 if (compare_super(&first_super
, &super
)) {
242 fprintf(stderr
, Name
": superblock on %s doesn't match others - assembly aborted\n",
247 if (devcnt
>= MD_SB_DISKS
) {
248 fprintf(stderr
, Name
": ouch - too many devices appear to be in this array. Ignoring %s\n",
253 fprintf(stderr
, Name
": %s is identified as a member of %s, slot %d.\n",
254 devname
, mddev
, super
.this_disk
.raid_disk
);
255 devices
[devcnt
].devname
= devname
;
256 devices
[devcnt
].major
= MAJOR(stb
.st_rdev
);
257 devices
[devcnt
].minor
= MINOR(stb
.st_rdev
);
258 devices
[devcnt
].events
= md_event(&super
);
259 devices
[devcnt
].utime
= super
.utime
;
260 devices
[devcnt
].raid_disk
= super
.this_disk
.raid_disk
;
261 devices
[devcnt
].uptodate
= 0;
262 if (most_recent
< devcnt
) {
263 if (devices
[devcnt
].events
264 > devices
[most_recent
].events
)
265 most_recent
= devcnt
;
267 i
= devices
[devcnt
].raid_disk
;
268 if (i
>=0 && i
< MD_SB_DISKS
)
270 || devices
[best
[i
]].events
< devices
[devcnt
].events
)
277 fprintf(stderr
, Name
": no devices found for %s\n",
281 /* now we have some devices that might be suitable.
286 for (i
=0; i
< MD_SB_DISKS
;i
++) {
288 int event_margin
= !force
;
290 if (devices
[j
].events
+event_margin
>=
291 devices
[most_recent
].events
) {
292 devices
[j
].uptodate
= 1;
293 if (i
< first_super
.raid_disks
)
299 while (force
&& !enough(first_super
.level
, first_super
.raid_disks
, okcnt
)) {
300 /* Choose the newest best drive which is
301 * not up-to-date, update the superblock
306 for (i
=0; i
<first_super
.raid_disks
; i
++) {
309 !devices
[j
].uptodate
&&
310 devices
[j
].events
> 0 &&
312 devices
[j
].events
> devices
[chosen_drive
].events
))
315 if (chosen_drive
< 0)
317 fprintf(stderr
, Name
": forcing event count in %s(%d) from %d upto %d\n",
318 devices
[chosen_drive
].devname
, devices
[chosen_drive
].raid_disk
,
319 (int)(devices
[chosen_drive
].events
),
320 (int)(devices
[most_recent
].events
));
321 fd
= open(devices
[chosen_drive
].devname
, O_RDWR
);
323 fprintf(stderr
, Name
": Couldn't open %s for write - not updating\n",
324 devices
[chosen_drive
].devname
);
325 devices
[chosen_drive
].events
= 0;
328 if (load_super(fd
, &super
)) {
330 fprintf(stderr
, Name
": RAID superblock disappeared from %s - not updating.\n",
331 devices
[chosen_drive
].devname
);
332 devices
[chosen_drive
].events
= 0;
335 super
.events_hi
= (devices
[most_recent
].events
>>32)&0xFFFFFFFF;
336 super
.events_lo
= (devices
[most_recent
].events
)&0xFFFFFFFF;
337 super
.sb_csum
= calc_sb_csum(&super
);
338 /*DRYRUN*/ if (store_super(fd
, &super
)) {
340 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
341 devices
[chosen_drive
].devname
);
342 devices
[chosen_drive
].events
= 0;
346 devices
[chosen_drive
].events
= devices
[most_recent
].events
;
347 devices
[chosen_drive
].uptodate
= 1;
351 /* Now we want to look at the superblock which the kernel will base things on
352 * and compare the devices that we think are working with the devices that the
353 * superblock thinks are working.
354 * If there are differences and --force is given, then update this chosen
358 for (i
=0; chosen_drive
< 0 && i
<MD_SB_DISKS
; i
++) {
363 if (!devices
[j
].uptodate
)
366 if ((fd
=open(devices
[j
].devname
, O_RDONLY
))< 0) {
367 fprintf(stderr
, Name
": Cannot open %s: %s\n",
368 devices
[j
].devname
, strerror(errno
));
371 if (load_super(fd
, &super
)) {
373 fprintf(stderr
, Name
": RAID superblock has disappeared from %s\n",
380 for (i
=0; i
<MD_SB_DISKS
; i
++) {
382 int active_sync
= (1<<MD_DISK_ACTIVE
) | (1<<MD_DISK_SYNC
);
385 if (!devices
[j
].uptodate
)
387 if (devices
[j
].major
!= super
.disks
[j
].major
||
388 devices
[j
].minor
!= super
.disks
[j
].minor
) {
390 super
.disks
[j
].major
= devices
[j
].major
;
391 super
.disks
[j
].minor
= devices
[j
].minor
;
393 if (devices
[j
].uptodate
&&
394 (super
.disks
[i
].state
!= active_sync
)) {
396 fprintf(stderr
, Name
": "
397 "clearing FAULTY flag for device %d in %s for %s\n",
398 j
, mddev
, devices
[j
].devname
);
399 super
.disks
[i
].state
= active_sync
;
402 fprintf(stderr
, Name
": "
403 "device %d in %s is marked faulty in superblock, but %s seems ok\n",
404 i
, mddev
, devices
[j
].devname
);
407 if (!devices
[j
].uptodate
&&
408 !(super
.disks
[i
].state
& (1 << MD_DISK_FAULTY
))) {
409 fprintf(stderr
, Name
": devices %d of %s is not marked FAULTY in superblock, but cannot be found\n",
414 if ((force
&& (change
& 2))
415 || (old_linux
&& (change
& 1))) {
417 super
.sb_csum
= calc_sb_csum(&super
);
418 fd
= open(devices
[chosen_drive
].devname
, O_RDWR
);
420 fprintf(stderr
, Name
": Could open %s for write - cannot Assemble array.\n",
421 devices
[chosen_drive
].devname
);
424 if (store_super(fd
, &super
)) {
426 fprintf(stderr
, Name
": Could not re-write superblock on %s\n",
427 devices
[chosen_drive
].devname
);
434 /* Almost ready to actually *do* something */
436 if (ioctl(mdfd
, SET_ARRAY_INFO
, NULL
) != 0) {
437 fprintf(stderr
, Name
": SET_ARRAY_INFO failed for %s: %s\n",
438 mddev
, strerror(errno
));
441 /* First, add the raid disks, but add the chosen one last */
442 for (i
=0; i
<=MD_SB_DISKS
; i
++) {
444 if (i
< MD_SB_DISKS
) {
446 if (j
== chosen_drive
)
451 if (j
>= 0 && devices
[j
].uptodate
) {
452 mdu_disk_info_t disk
;
453 memset(&disk
, 0, sizeof(disk
));
454 disk
.major
= devices
[j
].major
;
455 disk
.minor
= devices
[j
].minor
;
456 if (ioctl(mdfd
, ADD_NEW_DISK
, &disk
)!=0) {
457 fprintf(stderr
, Name
": failed to add %s to %s: %s\n",
461 if (i
< first_super
.raid_disks
)
466 fprintf(stderr
, Name
": added %s to %s as %d\n",
467 devices
[j
].devname
, mddev
, devices
[j
].raid_disk
);
468 } else if (verbose
&& i
< first_super
.raid_disks
)
469 fprintf(stderr
, Name
": no uptodate device for slot %d of %s\n",
475 ( first_super
.raid_disks
== okcnt
476 || start_partial_ok
&& enough(first_super
.level
, first_super
.raid_disks
, okcnt
))
478 if (ioctl(mdfd
, RUN_ARRAY
, NULL
)==0) {
479 fprintf(stderr
, Name
": %s has been started with %d drive%s",
480 mddev
, okcnt
, okcnt
==1?"":"s");
482 fprintf(stderr
, " and %d spare%s", sparecnt
, sparecnt
==1?"":"s");
483 fprintf(stderr
, ".\n");
486 fprintf(stderr
, Name
": failed to RUN_ARRAY %s: %s\n",
487 mddev
, strerror(errno
));
491 fprintf(stderr
, Name
": %s assembled from %d drive%s, but not started.\n",
492 mddev
, okcnt
, okcnt
==1?"":"s");
495 fprintf(stderr
, Name
": %s assembled from %d drive%s - not enough to start it (use --run to insist).\n",
496 mddev
, okcnt
, okcnt
==1?"":"s");
499 /* The "chosen_drive" is a good choice, and if necessary, the superblock has
500 * been updated to point to the current locations of devices.
501 * so we can just start the array
504 dev
= MKDEV(devices
[chosen_drive
].major
,
505 devices
[chosen_drive
].minor
);
506 if (ioctl(mdfd
, START_ARRAY
, dev
)) {
507 fprintf(stderr
, Name
": Cannot start array: %s\n",