Use O_EXCL when opening component devices to be assembled into an array
[thirdparty/mdadm.git] / Kill.c
CommitLineData
9a9dab36
NB
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
37int 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 mdp_super_t super;
45 int fd, rv = 0;
46
d7eaf49f 47 fd = open(dev, O_RDWR|O_EXCL);
9a9dab36
NB
48 if (fd < 0) {
49 fprintf(stderr, Name ": Couldn't open %s for write - not zeroing\n",
50 dev);
51 return 1;
52 }
53 rv = load_super(fd, &super);
54 if (force && rv >= 5)
55 rv = 0; /* ignore bad data in superblock */
56 switch(rv) {
57 case 1:
58 fprintf(stderr, Name ": cannot file device size for %s: %s\n",
59 dev, strerror(errno));
60 break;
61 case 2:
62 fprintf(stderr, Name ": %s is too small for md.\n", dev);
63 break;
64 case 3:
65 case 4:
66 fprintf(stderr, Name ": cannot access superblock on %s.\n", dev);
67 break;
68 case 5:
69 case 6:
70 fprintf(stderr, Name ": %s does not appear to have an MD superblock.\n", dev);
71 break;
72 }
73 if (!rv) {
74 memset(&super, 0, sizeof(super));
75 if (store_super(fd, &super)) {
76 fprintf(stderr, Name ": Could not zero superblock on %s\n",
77 dev);
78 rv = 1;
79 }
80 }
81 close(fd);
82 return rv;
83}