Change write_init_super to be called only once.
[thirdparty/mdadm.git] / Kill.c
1 /*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
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, int quiet, int noexcl)
38 {
39 /*
40 * Nothing fancy about Kill. It just zeroes out a superblock
41 * Definitely not safe.
42 */
43
44 int fd, rv = 0;
45 struct supertype *st;
46
47 fd = open(dev, noexcl ? O_RDWR : (O_RDWR|O_EXCL));
48 if (fd < 0) {
49 if (!quiet)
50 fprintf(stderr, Name ": Couldn't open %s for write - not zeroing\n",
51 dev);
52 close(fd);
53 return 1;
54 }
55 st = guess_super(fd);
56 if (st == NULL) {
57 if (!quiet)
58 fprintf(stderr, Name ": Unrecognised md component device - %s\n", dev);
59 close(fd);
60 return 1;
61 }
62 rv = st->ss->load_super(st, fd, dev);
63 if (force && rv >= 2)
64 rv = 0; /* ignore bad data in superblock */
65 if (rv== 0 || (force && rv >= 2)) {
66 mdu_array_info_t info;
67 info.major_version = -1; /* zero superblock */
68 st->ss->free_super(st);
69 st->ss->init_super(st, &info, 0, "", NULL, NULL);
70 if (st->ss->store_super(st, fd)) {
71 if (!quiet)
72 fprintf(stderr, Name ": Could not zero superblock on %s\n",
73 dev);
74 rv = 1;
75 } else if (rv) {
76 if (!quiet)
77 fprintf(stderr, Name ": superblock zeroed anyway\n");
78 rv = 0;
79 }
80 }
81 close(fd);
82 return rv;
83 }