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