]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - Create.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 Create(char *mddev
, int mdfd
,
35 int chunk
, int level
, int layout
, unsigned long size
, int raiddisks
, int sparedisks
,
36 int subdevs
, mddev_dev_t devlist
,
37 int runstop
, int verbose
, int force
)
40 * Create a new raid array.
42 * First check that necessary details are available
43 * (i.e. level, raid-disks)
45 * Then check each disk to see what might be on it
46 * and report anything interesting.
48 * If anything looks odd, and runstop not set,
51 * SET_ARRAY_INFO and ADD_NEW_DISK, and
52 * if runstop==run, or raiddisks diskswere used,
55 unsigned long minsize
=0, maxsize
=0;
62 int first_missing
= MD_SB_DISKS
*2;
63 int missing_disks
= 0;
64 int insert_point
= MD_SB_DISKS
*2; /* where to insert a missing drive */
65 mddev_dev_t moved_disk
= NULL
; /* the disk that was moved out of the insert point */
67 mdu_array_info_t array
;
70 if (md_get_version(mdfd
) < 9000) {
71 fprintf(stderr
, Name
": Create requires md driver version 0.90.0 or later\n");
76 Name
": a RAID level is needed to create an array.\n");
81 Name
": a number of --raid-devices must be given to create an array\n");
84 if (raiddisks
< 4 && level
== 6) {
86 Name
": at least 4 raid-devices needed for level 6\n");
89 if (raiddisks
> 256 && level
== 6) {
91 Name
": no more than 256 raid-devices supported for level 6\n");
94 if (raiddisks
< 2 && level
>= 4) {
96 Name
": at least 2 raid-devices needed for level 4 or 5\n");
99 if (raiddisks
+sparedisks
> MD_SB_DISKS
) {
101 Name
": too many devices requested: %d+%d > %d\n",
102 raiddisks
, sparedisks
, MD_SB_DISKS
);
105 if (subdevs
> raiddisks
+sparedisks
) {
106 fprintf(stderr
, Name
": You have listed more devices (%d) than are in the array(%d)!\n", subdevs
, raiddisks
+sparedisks
);
109 if (subdevs
< raiddisks
+sparedisks
) {
110 fprintf(stderr
, Name
": You haven't given enough devices (real or missing) to create this array\n");
114 /* now set some defaults */
117 default: /* no layout */
121 layout
= 0x102; /* near=2, far=1 */
124 Name
": layout defaults to n1\n");
128 layout
= map_name(r5layout
, "default");
131 Name
": layout defaults to %s\n", map_num(r5layout
, layout
));
136 /* check layout fits in array*/
137 if ((layout
&255) * ((layout
>>8)&255) > raiddisks
) {
138 fprintf(stderr
, Name
": that layout requires at least %d devices\n",
139 (layout
&255) * ((layout
>>8)&255));
149 case -1: /* linear */
153 fprintf(stderr
, Name
": chunk size defaults to 64K\n");
156 default: /* raid1, multipath */
160 fprintf(stderr
, Name
": chunk size ignored for this level\n");
165 /* now look at the subdevs */
166 array
.active_disks
= 0;
167 array
.working_disks
= 0;
169 for (dv
=devlist
; dv
; dv
=dv
->next
, dnum
++) {
170 char *dname
= dv
->devname
;
171 unsigned long dsize
, freesize
;
173 if (strcasecmp(dname
, "missing")==0) {
174 if (first_missing
> dnum
)
175 first_missing
= dnum
;
179 array
.working_disks
++;
180 if (dnum
< raiddisks
)
181 array
.active_disks
++;
182 fd
= open(dname
, O_RDONLY
, 0);
184 fprintf(stderr
, Name
": Cannot open %s: %s\n",
185 dname
, strerror(errno
));
189 if (ioctl(fd
, BLKGETSIZE
, &dsize
)) {
190 fprintf(stderr
, Name
": Cannot get size of %s: %s\n",
191 dname
, strerror(errno
));
196 if (dsize
< MD_RESERVED_SECTORS
*2) {
197 fprintf(stderr
, Name
": %s is too small: %luK\n",
203 freesize
= MD_NEW_SIZE_SECTORS(dsize
);
206 if (size
&& freesize
< size
) {
207 fprintf(stderr
, Name
": %s is smaller that given size."
208 " %luK < %luK + superblock\n", dname
, freesize
, size
);
213 if (maxdisc
== NULL
|| (maxdisc
&& freesize
> maxsize
)) {
217 if (mindisc
==NULL
|| (mindisc
&& freesize
< minsize
)) {
221 warn
|= check_ext2(fd
, dname
);
222 warn
|= check_reiser(fd
, dname
);
223 warn
|= check_raid(fd
, dname
);
227 fprintf(stderr
, Name
": create aborted\n");
231 if (mindisc
== NULL
) {
232 fprintf(stderr
, Name
": no size and no drives given - aborting create.\n");
236 if (verbose
&& level
>0)
237 fprintf(stderr
, Name
": size set to %luK\n", size
);
239 if (level
>= 1 && ((maxsize
-size
)*100 > maxsize
)) {
240 fprintf(stderr
, Name
": largest drive (%s) exceed size (%luK) by more than 1%%\n",
247 if (!ask("Continue creating array? ")) {
248 fprintf(stderr
, Name
": create aborted.\n");
253 fprintf(stderr
, Name
": creation continuing despite oddities due to --run\n");
257 /* If this is raid5, we want to configure the last active slot
258 * as missing, so that a reconstruct happens (faster than re-parity)
259 * FIX: Can we do this for raid6 as well?
261 if (force
== 0 && first_missing
>= raiddisks
) {
264 insert_point
= raiddisks
-1;
266 array
.active_disks
--;
274 /* Ok, lets try some ioctls */
278 array
.raid_disks
= raiddisks
;
279 /* The kernel should *know* what md_minor we are dealing
280 * with, but it chooses to trust me instead. Sigh
283 if (fstat(mdfd
, &stb
)==0)
284 array
.md_minor
= MINOR(stb
.st_rdev
);
285 array
.not_persistent
= 0;
286 /*** FIX: Need to do something about RAID-6 here ***/
287 if ( (level
== 5 || level
== 6) &&
288 (insert_point
< raiddisks
|| first_missing
< raiddisks
) )
289 array
.state
= 1; /* clean, but one+ drive will be missing */
291 array
.state
= 0; /* not clean, but no errors */
293 /* There is lots of redundancy in these disk counts,
294 * raid_disks is the most meaningful value
295 * it describes the geometry of the array
297 * nr_disks is total number of used slots.
298 * it should be raid_disks+spare_disks
299 * spare_disks is the number of extra disks present
301 * active_disks is the number of working disks in
302 * active slots. (With raid_disks)
303 * working_disks is the total number of working disks,
305 * failed_disks is the number of disks marked failed
307 * Ideally, the kernel would keep these (except raid_disks)
308 * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
309 * So for now, we assume that all raid and spare
310 * devices will be given.
312 array
.spare_disks
=sparedisks
;
313 array
.failed_disks
=missing_disks
;
314 array
.nr_disks
= array
.working_disks
+ array
.failed_disks
;
315 array
.layout
= layout
;
316 array
.chunk_size
= chunk
*1024;
318 if (ioctl(mdfd
, SET_ARRAY_INFO
, &array
)) {
319 fprintf(stderr
, Name
": SET_ARRAY_INFO failed for %s: %s\n",
320 mddev
, strerror(errno
));
324 for (dnum
=0, dv
= devlist
; dv
; dv
=(dv
->next
)?(dv
->next
):moved_disk
, dnum
++) {
327 mdu_disk_info_t disk
;
330 if (dnum
== insert_point
) {
333 disk
.raid_disk
= disk
.number
;
334 if (disk
.raid_disk
< raiddisks
)
335 disk
.state
= 6; /* active and in sync */
338 if (dnum
== insert_point
||
339 strcasecmp(dv
->devname
, "missing")==0) {
342 disk
.state
= 1; /* faulty */
344 fd
= open(dv
->devname
, O_RDONLY
, 0);
346 fprintf(stderr
, Name
": failed to open %s after earlier success - aborting\n",
351 disk
.major
= MAJOR(stb
.st_rdev
);
352 disk
.minor
= MINOR(stb
.st_rdev
);
355 if (ioctl(mdfd
, ADD_NEW_DISK
, &disk
)) {
356 fprintf(stderr
, Name
": ADD_NEW_DISK for %s failed: %s\n",
357 dv
->devname
, strerror(errno
));
360 if (dv
== moved_disk
&& dnum
!= insert_point
) break;
363 /* param is not actually used */
364 if (runstop
== 1 || subdevs
>= raiddisks
) {
366 if (ioctl(mdfd
, RUN_ARRAY
, ¶m
)) {
367 fprintf(stderr
, Name
": RUN_ARRAY failed: %s\n",
369 Manage_runstop(mddev
, mdfd
, -1);
372 fprintf(stderr
, Name
": array %s started.\n", mddev
);
374 fprintf(stderr
, Name
": not starting array - not enough devices.\n");