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                         fprintf(stderr, Name ": 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) {
  57                 if (!quiet)
  58                         fprintf(stderr, Name ": Unrecognised md component device - %s\n", dev);
  59                 close(fd);
  60                 return 2;
  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                 st->ss->free_super(st);
  67                 st->ss->init_super(st, NULL, 0, "", NULL, NULL);
  68                 if (st->ss->store_super(st, fd)) {
  69                         if (!quiet)
  70                                 fprintf(stderr, Name ": Could not zero superblock on %s\n",
  71                                         dev);
  72                         rv = 1;
  73                 } else if (rv) {
  74                         if (!quiet)
  75                                 fprintf(stderr, Name ": superblock zeroed anyway\n");
  76                         rv = 0;
  77                 }
  78         }
  79         close(fd);
  80         return rv;
  81 }
  82
  83 int Kill_subarray(char *dev, char *subarray, int quiet)
  84 {
  85         /* Delete a subarray out of a container, the subarry must be
  86          * inactive.  The subarray string must be a subarray index
  87          * number.
  88          *
  89          * 0 = successfully deleted subarray from all container members
  90          * 1 = failed to sync metadata to one or more devices
  91          * 2 = failed to find the container, subarray, or other resource
  92          *     issue
  93          */
  94         struct supertype supertype, *st = &supertype;
  95         int fd, rv = 2;
  96
  97         memset(st, 0, sizeof(*st));
  98
  99         if (snprintf(st->subarray, sizeof(st->subarray), "%s", subarray) >=
 100             (int)sizeof(st->subarray)) {
 101                 if (!quiet)
 102                         fprintf(stderr,
 103                                 Name ": Input overflow for subarray '%s' > %zu bytes\n",
 104                                 subarray, sizeof(st->subarray) - 1);
 105                 return 2;
 106         }
 107
 108         fd = open_subarray(dev, st, quiet);
 109         if (fd < 0)
 110                 return 2;
 111
 112         if (!st->ss->kill_subarray) {
 113                 if (!quiet)
 114                         fprintf(stderr,
 115                                 Name ": Operation not supported for %s metadata\n",
 116                                 st->ss->name);
 117                 goto free_super;
 118         }
 119
 120         if (is_subarray_active(subarray, st->devname)) {
 121                 if (!quiet)
 122                         fprintf(stderr,
 123                                 Name ": Subarray-%s still active, aborting\n",
 124                                 subarray);
 125                 goto free_super;
 126         }
 127
 128         if (mdmon_running(st->devnum))
 129                 st->update_tail = &st->updates;
 130
 131         /* ok we've found our victim, drop the axe */
 132         rv = st->ss->kill_subarray(st);
 133         if (rv) {
 134                 if (!quiet)
 135                         fprintf(stderr,
 136                                 Name ": Failed to delete subarray-%s from %s\n",
 137                                 subarray, dev);
 138                 goto free_super;
 139         }
 140
 141         /* FIXME these routines do not report success/failure */
 142         if (st->update_tail)
 143                 flush_metadata_updates(st);
 144         else
 145                 st->ss->sync_metadata(st);
 146
 147         if (!quiet)
 148                 fprintf(stderr,
 149                         Name ": Deleted subarray-%s from %s, UUIDs may have changed\n",
 150                         subarray, dev);
 151
 152         rv = 0;
 153
 154  free_super:
 155         st->ss->free_super(st);
 156         close(fd);
 157
 158         return rv;
 159 }