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 }