tests/qemu-iotests/138

   1 #!/bin/bash
   2 #
   3 # General test case for qcow2's image check
   4 #
   5 # Copyright (C) 2015 Red Hat, Inc.
   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, see <http://www.gnu.org/licenses/>.
  19 #
  20
  21 # creator
  22 owner=mreitz@redhat.com
  23
  24 seq="$(basename $0)"
  25 echo "QA output created by $seq"
  26
  27 here="$PWD"
  28 tmp=/tmp/$$
  29 status=1        # failure is the default!
  30
  31 _cleanup()
  32 {
  33         _cleanup_test_img
  34 }
  35 trap "_cleanup; exit \$status" 0 1 2 3 15
  36
  37 # get standard environment, filters and checks
  38 . ./common.rc
  39 . ./common.filter
  40
  41 # This tests qocw2-specific low-level functionality
  42 _supported_fmt qcow2
  43 _supported_proto file
  44 _supported_os Linux
  45
  46 echo
  47 echo '=== Check on an image with a multiple of 2^32 clusters ==='
  48 echo
  49
  50 IMGOPTS=$(_optstr_add "$IMGOPTS" "cluster_size=512") \
  51     _make_test_img 512
  52
  53 # Allocate L2 table
  54 $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
  55
  56 # Put the data cluster at a multiple of 2 TB, resulting in the image apparently
  57 # having a multiple of 2^32 clusters
  58 # (To be more specific: It is at 32 PB)
  59 poke_file "$TEST_IMG" 2048 "\x80\x80\x00\x00\x00\x00\x00\x00"
  60
  61 # An offset of 32 PB results in qemu-img check having to allocate an in-memory
  62 # refcount table of 128 TB (16 bit refcounts, 512 byte clusters).
  63 # This should be generally too much for any system and thus fail.
  64 # What this test is checking is that the qcow2 driver actually tries to allocate
  65 # such a large amount of memory (and is consequently aborting) instead of having
  66 # truncated the cluster count somewhere (which would result in much less memory
  67 # being allocated and then a segfault occurring).
  68 _check_test_img
  69
  70 # success, all done
  71 echo "*** done"
  72 rm -f $seq.full
  73 status=0