]>
git.ipfire.org Git - thirdparty/mdadm.git/blob - Create.c
2 * mdctl - manage Linux "md" devices aka RAID arrays.
4 * Copyright (C) 2001 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
, int size
, int raiddisks
, int sparedisks
,
36 int subdevs
, char *subdev
[],
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,
56 int maxdisc
= -1, mindisc
= -1;
60 int first_missing
= MD_SB_DISKS
*2;
61 int missing_disks
= 0;
62 int insert_point
= MD_SB_DISKS
*2; /* where to insert a missing drive */
64 mdu_array_info_t array
;
67 if (md_get_version(mdfd
) < 9000) {
68 fprintf(stderr
, Name
": Create requires md driver verison 0.90.0 or later\n");
73 Name
": a RAID level is needed to create an array.\n");
78 Name
": a number of --raid-disks must be given to create an array\n");
81 if (raiddisks
< 2 && level
>= 4) {
83 Name
": atleast 2 raid-disks needed for level 4 or 5\n");
86 if (raiddisks
+sparedisks
> MD_SB_DISKS
) {
88 Name
": too many discs requested: %d+%d > %d\n",
89 raiddisks
, sparedisks
, MD_SB_DISKS
);
92 if (subdevs
> raiddisks
+sparedisks
) {
93 fprintf(stderr
, Name
": You have listed more disks (%d) than are in the array(%d)!\n", subdevs
, raiddisks
+sparedisks
);
96 if (subdevs
< raiddisks
) {
97 fprintf(stderr
, Name
": You haven't given enough devices (real or missing) to create this array\n");
101 /* now set some defaults */
104 default: /* no layout */
108 layout
= map_name(r5layout
, "default");
111 Name
": layout defaults to %s\n", map_num(r5layout
, layout
));
118 fprintf(stderr
, Name
": chunk size defaults to 64K\n");
121 /* now look at the subdevs */
122 array
.active_disks
= 0;
123 array
.working_disks
= 0;
124 for (i
=0; i
<subdevs
; i
++) {
125 char *dname
= subdev
[i
];
128 if (strcasecmp(subdev
[i
], "missing")==0) {
129 if (first_missing
> i
)
134 array
.working_disks
++;
136 array
.active_disks
++;
137 fd
= open(dname
, O_RDONLY
, 0);
139 fprintf(stderr
, Name
": Cannot open %s: %s\n",
140 dname
, strerror(errno
));
144 if (ioctl(fd
, BLKGETSIZE
, &dsize
)) {
145 fprintf(stderr
, Name
": Cannot get size of %s: %s\n",
146 dname
, strerror(errno
));
151 if (dsize
< MD_RESERVED_SECTORS
*2) {
152 fprintf(stderr
, Name
": %s is too small: %dK\n",
158 freesize
= MD_NEW_SIZE_SECTORS(dsize
);
161 if (size
&& freesize
< size
) {
162 fprintf(stderr
, Name
": %s is smaller that given size."
163 " %dK < %dK + superblock\n", dname
, freesize
, size
);
168 if (maxdisc
< 0 || (maxdisc
>=0 && freesize
> maxsize
)) {
172 if (mindisc
< 0 || (mindisc
>=0 && freesize
< minsize
)) {
176 warn
|= check_ext2(fd
, dname
);
177 warn
|= check_reiser(fd
, dname
);
178 warn
|= check_raid(fd
, dname
);
182 fprintf(stderr
, Name
": create aborted\n");
187 fprintf(stderr
, Name
": no size and no drives given - aborting create.\n");
191 if (verbose
&& level
>0)
192 fprintf(stderr
, Name
": size set to %dK\n", size
);
194 if ((maxsize
-size
)*100 > maxsize
) {
195 fprintf(stderr
, Name
": largest drive (%s) exceed size (%dK) by more than 1%\n",
196 subdev
[maxdisc
], size
);
202 if (!ask("Continue creating array? ")) {
203 fprintf(stderr
, Name
": create aborted.\n");
208 fprintf(stderr
, Name
": creation continuing despite oddities due to --run\n");
212 /* If this is raid5, we want to configure the last active slot
213 * as missing, so that a reconstruct happens (faster than re-parity)
215 if (force
== 0 && level
== 5 && first_missing
>= raiddisks
) {
216 insert_point
= raiddisks
-1;
218 array
.active_disks
--;
222 /* Ok, lets try some ioctls */
226 array
.raid_disks
= raiddisks
;
227 /* The kernel should *know* what md_minor we are dealing
228 * with, but it chooses to trust me instead. Sigh
231 if (fstat(mdfd
, &stb
)==0)
232 array
.md_minor
= MINOR(stb
.st_rdev
);
233 array
.not_persistent
= 0;
234 if (level
== 5 && (insert_point
< raiddisks
|| first_missing
< raiddisks
))
235 array
.state
= 1; /* clean, but one drive will be missing */
237 array
.state
= 0; /* not clean, but no errors */
239 /* There is lots of redundancy in these disk counts,
240 * raid_disks is the most meaningful value
241 * it describes the geometry of the array
243 * nr_disks is total number of used slots.
244 * it should be raid_disks+spare_disks
245 * spare_disks is the number of extra disks present
247 * active_disks is the number of working disks in
248 * active slots. (With raid_disks)
249 * working_disks is the total number of working disks,
251 * failed_disks is the number of disks marked failed
253 * Ideally, the kernel would keep these (except raid_disks)
254 * up-to-date as we ADD_NEW_DISK, but it doesn't (yet).
255 * So for now, we assume that all raid and spare
256 * devices will be given.
258 array
.spare_disks
=sparedisks
;
259 array
.failed_disks
=missing_disks
;
260 array
.nr_disks
= array
.working_disks
+ array
.failed_disks
;
261 array
.layout
= layout
;
262 array
.chunk_size
= chunk
*1024;
264 if (ioctl(mdfd
, SET_ARRAY_INFO
, &array
)) {
265 fprintf(stderr
, Name
": SET_ARRAY_INFO failed for %s: %s\n",
266 mddev
, strerror(errno
));
270 for (i
=0; i
<subdevs
; i
++) {
273 mdu_disk_info_t disk
;
276 if (i
>= insert_point
)
278 disk
.raid_disk
= disk
.number
;
279 if (disk
.raid_disk
< raiddisks
)
280 disk
.state
= 6; /* active and in sync */
283 if (strcasecmp(subdev
[i
], "missing")==0) {
286 disk
.state
= 1; /* faulty */
288 fd
= open(subdev
[i
], O_RDONLY
, 0);
290 fprintf(stderr
, Name
": failed to open %s after earlier success - aborting\n",
295 disk
.major
= MAJOR(stb
.st_rdev
);
296 disk
.minor
= MINOR(stb
.st_rdev
);
299 if (ioctl(mdfd
, ADD_NEW_DISK
, &disk
)) {
300 fprintf(stderr
, Name
": ADD_NEW_DISK for %s failed: %s\n",
301 subdev
[i
], strerror(errno
));
306 if (insert_point
< MD_SB_DISKS
) {
307 mdu_disk_info_t disk
;
308 disk
.number
= insert_point
;
309 disk
.raid_disk
= disk
.number
;
310 disk
.state
= 1; /* faulty */
311 disk
.major
= disk
.minor
= 0;
312 ioctl(mdfd
,ADD_NEW_DISK
, &disk
);
315 /* param is not actually used */
316 if (runstop
== 1 || subdevs
>= raiddisks
) {
318 if (ioctl(mdfd
, RUN_ARRAY
, ¶m
)) {
319 fprintf(stderr
, Name
": RUN_ARRAY failed: %s\n",
323 fprintf(stderr
, Name
": array %s started.\n", mddev
);
325 fprintf(stderr
, Name
": not starting array - not enough discs.\n");