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1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
5 *
6 *
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.
11 *
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.
16 *
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
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 *
29 * Added by Dale Stephenson
30 * steph@snapserver.com
31 */
32
33 #include "mdadm.h"
34 #include "md_u.h"
35 #include "md_p.h"
36
37 int Kill(char *dev, int force)
38 {
39 /*
40 * Nothing fancy about Kill. It just zeroes out a superblock
41 * Definitely not safe.
42 */
43
44 void *super;
45 int fd, rv = 0;
46 struct supertype *st;
47
48 fd = open(dev, O_RDWR|O_EXCL);
49 if (fd < 0) {
50 fprintf(stderr, Name ": Couldn't open %s for write - not zeroing\n",
51 dev);
52 return 1;
53 }
54 st = guess_super(fd);
55 if (st == NULL) {
56 fprintf(stderr, Name ": Unrecognised md component device - %s\n", dev);
57 return 1;
58 }
59 rv = st->ss->load_super(st, fd, &super, dev);
60 if (force && rv >= 2)
61 rv = 0; /* ignore bad data in superblock */
62 if (rv== 0 || (force && rv >= 2)) {
63 mdu_array_info_t info;
64 info.major_version = -1; /* zero superblock */
65 free(super);
66 st->ss->init_super(st, &super, &info);
67 if (st->ss->store_super(st, fd, super)) {
68 fprintf(stderr, Name ": Could not zero superblock on %s\n",
69 dev);
70 rv = 1;
71 } else if (rv) {
72 fprintf(stderr, Name ": superblock zeroed anyway\n");
73 rv = 0;
74 }
75 }
76 close(fd);
77 return rv;
78 }