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, struct supertype *st, int force, int quiet, int noexcl)
  33 {
  34         /*
  35          * Nothing fancy about Kill.  It just zeroes out a superblock
  36          * Definitely not safe.
  37          * Returns:
  38          *  0 - a zero superblock was successfully written out
  39          *  1 - failed to write the zero superblock
  40          *  2 - failed to open the device or find a superblock.
  41          */
  42
  43         int fd, rv = 0;
  44
  45         if (force)
  46                 noexcl = 1;
  47         fd = open(dev, O_RDWR|(noexcl ? 0 : O_EXCL));
  48         if (fd < 0) {
  49                 if (!quiet)
  50                         pr_err("Couldn't open %s for write - not zeroing\n",
  51                                 dev);
  52                 return 2;
  53         }
  54         if (st == NULL)
  55                 st = guess_super(fd);
  56         if (st == NULL || st->ss->init_super == NULL) {
  57                 if (!quiet)
  58                         pr_err("Unrecognised md component device - %s\n", dev);
  59                 close(fd);
  60                 return 2;
  61         }
  62         st->ignore_hw_compat = 1;
  63         rv = st->ss->load_super(st, fd, dev);
  64         if (rv == 0 || (force && rv >= 2)) {
  65                 st->ss->free_super(st);
  66                 st->ss->init_super(st, NULL, 0, "", NULL, NULL);
  67                 if (st->ss->store_super(st, fd)) {
  68                         if (!quiet)
  69                                 pr_err("Could not zero superblock on %s\n",
  70                                         dev);
  71                         rv = 1;
  72                 } else if (rv) {
  73                         if (!quiet)
  74                                 pr_err("superblock zeroed anyway\n");
  75                         rv = 0;
  76                 }
  77         }
  78         close(fd);
  79         return rv;
  80 }
  81
  82 int Kill_subarray(char *dev, char *subarray, int quiet)
  83 {
  84         /* Delete a subarray out of a container, the subarry must be
  85          * inactive.  The subarray string must be a subarray index
  86          * number.
  87          *
  88          * 0 = successfully deleted subarray from all container members
  89          * 1 = failed to sync metadata to one or more devices
  90          * 2 = failed to find the container, subarray, or other resource
  91          *     issue
  92          */
  93         struct supertype supertype, *st = &supertype;
  94         int fd, rv = 2;
  95
  96         memset(st, 0, sizeof(*st));
  97
  98         fd = open_subarray(dev, subarray, st, quiet);
  99         if (fd < 0)
 100                 return 2;
 101
 102         if (!st->ss->kill_subarray) {
 103                 if (!quiet)
 104                         pr_err("Operation not supported for %s metadata\n",
 105                                st->ss->name);
 106                 goto free_super;
 107         }
 108
 109         if (is_subarray_active(subarray, st->devname)) {
 110                 if (!quiet)
 111                         pr_err("Subarray-%s still active, aborting\n",
 112                                subarray);
 113                 goto free_super;
 114         }
 115
 116         if (mdmon_running(st->devnum))
 117                 st->update_tail = &st->updates;
 118
 119         /* ok we've found our victim, drop the axe */
 120         rv = st->ss->kill_subarray(st);
 121         if (rv) {
 122                 if (!quiet)
 123                         pr_err("Failed to delete subarray-%s from %s\n",
 124                                subarray, dev);
 125                 goto free_super;
 126         }
 127
 128         /* FIXME these routines do not report success/failure */
 129         if (st->update_tail)
 130                 flush_metadata_updates(st);
 131         else
 132                 st->ss->sync_metadata(st);
 133
 134         if (!quiet)
 135                 pr_err("Deleted subarray-%s from %s, UUIDs may have changed\n",
 136                        subarray, dev);
 137
 138         rv = 0;
 139
 140  free_super:
 141         st->ss->free_super(st);
 142         close(fd);
 143
 144         return rv;
 145 }