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 verbose, 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.
  41          *  4 - failed to find a superblock.
  42          */
  43
  44         bool free_super = false;
  45         int fd, rv = 0;
  46
  47         if (force)
  48                 noexcl = 1;
  49         fd = open(dev, O_RDWR|(noexcl ? 0 : O_EXCL));
  50         if (fd < 0) {
  51                 if (verbose >= 0)
  52                         pr_err("Couldn't open %s for write - not zeroing\n",
  53                                 dev);
  54                 return 2;
  55         }
  56         if (st == NULL) {
  57                 st = guess_super(fd);
  58                 free_super = true;
  59         }
  60         if (st == NULL || st->ss->init_super == NULL) {
  61                 if (verbose >= 0)
  62                         pr_err("Unrecognised md component device - %s\n", dev);
  63                 close(fd);
  64                 return 4;
  65         }
  66         st->ignore_hw_compat = 1;
  67         rv = st->ss->load_super(st, fd, dev);
  68         if (rv == 0 || (force && rv >= 2)) {
  69                 st->ss->free_super(st);
  70                 st->ss->init_super(st, NULL, NULL, "", NULL, NULL,
  71                                    INVALID_SECTORS);
  72                 if (st->ss->store_super(st, fd)) {
  73                         if (verbose >= 0)
  74                                 pr_err("Could not zero superblock on %s\n",
  75                                         dev);
  76                         rv = 1;
  77                 } else if (rv) {
  78                         if (verbose >= 0)
  79                                 pr_err("superblock zeroed anyway\n");
  80                         rv = 0;
  81                 }
  82         }
  83         if (free_super && st) {
  84                 st->ss->free_super(st);
  85                 free(st);
  86         }
  87         close(fd);
  88         return rv;
  89 }
  90
  91 int Kill_subarray(char *dev, char *subarray, int verbose)
  92 {
  93         /* Delete a subarray out of a container, the subarry must be
  94          * inactive.  The subarray string must be a subarray index
  95          * number.
  96          *
  97          * 0 = successfully deleted subarray from all container members
  98          * 1 = failed to sync metadata to one or more devices
  99          * 2 = failed to find the container, subarray, or other resource
 100          *     issue
 101          */
 102         struct supertype supertype, *st = &supertype;
 103         int fd, rv = 2;
 104
 105         memset(st, 0, sizeof(*st));
 106
 107         fd = open_subarray(dev, subarray, st, verbose < 0);
 108         if (fd < 0)
 109                 return 2;
 110
 111         if (!st->ss->kill_subarray) {
 112                 if (verbose >= 0)
 113                         pr_err("Operation not supported for %s metadata\n",
 114                                st->ss->name);
 115                 goto free_super;
 116         }
 117
 118         if (is_subarray_active(subarray, st->devnm)) {
 119                 if (verbose >= 0)
 120                         pr_err("Subarray-%s still active, aborting\n",
 121                                subarray);
 122                 goto free_super;
 123         }
 124
 125         if (mdmon_running(st->devnm))
 126                 st->update_tail = &st->updates;
 127
 128         /* ok we've found our victim, drop the axe */
 129         rv = st->ss->kill_subarray(st, subarray);
 130         if (rv) {
 131                 if (verbose >= 0)
 132                         pr_err("Failed to delete subarray-%s from %s\n",
 133                                subarray, dev);
 134                 goto free_super;
 135         }
 136
 137         /* FIXME these routines do not report success/failure */
 138         if (st->update_tail)
 139                 flush_metadata_updates(st);
 140         else
 141                 st->ss->sync_metadata(st);
 142
 143         if (verbose >= 0)
 144                 pr_err("Deleted subarray-%s from %s, UUIDs may have changed\n",
 145                        subarray, dev);
 146
 147         rv = 0;
 148
 149  free_super:
 150         st->ss->free_super(st);
 151         close(fd);
 152
 153         return rv;
 154 }