Kill.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2009 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@suse.de>
  23  *
  24  *    Added by Dale Stephenson
  25  *    steph@snapserver.com
  26  */
  27
  28 #include        "mdadm.h"
  29 #include        "md_u.h"
  30 #include        "md_p.h"
  31
  32 int Kill(char *dev, int force, int quiet, int noexcl)
  33 {
  34         /*
  35          * Nothing fancy about Kill.  It just zeroes out a superblock
  36          * Definitely not safe.
  37          */
  38
  39         int fd, rv = 0;
  40         struct supertype *st;
  41
  42         if (force)
  43                 noexcl = 1;
  44         fd = open(dev, O_RDWR|(force ? 0 : O_EXCL));
  45         if (fd < 0) {
  46                 if (!quiet)
  47                         fprintf(stderr, Name ": Couldn't open %s for write - not zeroing\n",
  48                                 dev);
  49                 close(fd);
  50                 return 1;
  51         }
  52         st = guess_super(fd);
  53         if (st == NULL) {
  54                 if (!quiet)
  55                         fprintf(stderr, Name ": Unrecognised md component device - %s\n", dev);
  56                 close(fd);
  57                 return 1;
  58         }
  59         rv = st->ss->load_super(st, fd, dev);
  60         if (force && rv >= 2)
  61                 rv = 0; /* ignore bad data in superblock */
  62         if (rv== 0 || (force && rv >= 2)) {
  63                 st->ss->free_super(st);
  64                 st->ss->init_super(st, NULL, 0, "", NULL, NULL);
  65                 if (st->ss->store_super(st, fd)) {
  66                         if (!quiet)
  67                                 fprintf(stderr, Name ": Could not zero superblock on %s\n",
  68                                         dev);
  69                         rv = 1;
  70                 } else if (rv) {
  71                         if (!quiet)
  72                                 fprintf(stderr, Name ": superblock zeroed anyway\n");
  73                         rv = 0;
  74                 }
  75         }
  76         close(fd);
  77         return rv;
  78 }