tests/qemu-iotests/108

   1 #!/usr/bin/env bash
   2 # group: rw auto quick
   3 #
   4 # Test case for repairing qcow2 images which cannot be repaired using
   5 # the on-disk refcount structures
   6 #
   7 # Copyright (C) 2014 Red Hat, Inc.
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22
  23 # creator
  24 owner=mreitz@redhat.com
  25
  26 seq="$(basename $0)"
  27 echo "QA output created by $seq"
  28
  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 qcow2-specific low-level functionality
  42 _supported_fmt qcow2
  43 _supported_proto file fuse
  44 _supported_os Linux
  45 # This test directly modifies a refblock so it relies on refcount_bits being 16;
  46 # and the low-level modification it performs are not tuned for external data
  47 # files
  48 _unsupported_imgopts 'refcount_bits=\([^1]\|.\([^6]\|$\)\)' data_file
  49
  50 echo
  51 echo '=== Repairing an image without any refcount table ==='
  52 echo
  53
  54 _make_test_img 64M
  55 # just write some data
  56 $QEMU_IO -c 'write -P 42 0 64k' "$TEST_IMG" | _filter_qemu_io
  57
  58 # refcount_table_offset
  59 poke_file "$TEST_IMG" $((0x30)) "\x00\x00\x00\x00\x00\x00\x00\x00"
  60 # refcount_table_clusters
  61 poke_file "$TEST_IMG" $((0x38)) "\x00\x00\x00\x00"
  62
  63 _check_test_img -r all
  64
  65 $QEMU_IO -c 'read -P 42 0 64k' "$TEST_IMG" | _filter_qemu_io
  66
  67 echo
  68 echo '=== Repairing unreferenced data cluster in new refblock area ==='
  69 echo
  70
  71 _make_test_img -o 'cluster_size=512' 64M
  72 # Allocate the first 128 kB in the image (first refblock)
  73 $QEMU_IO -c 'write 0 0x1b200' "$TEST_IMG" | _filter_qemu_io
  74 # should be 131072 == 0x20000
  75 stat -c '%s' "$TEST_IMG"
  76
  77 # Enter a cluster at 128 kB (0x20000)
  78 # XXX: This should be the first free entry in the last L2 table, but we cannot
  79 # be certain
  80 poke_file "$TEST_IMG" $((0x1ccc8)) "\x80\x00\x00\x00\x00\x02\x00\x00"
  81
  82 # Fill the cluster
  83 truncate -s $((0x20200)) "$TEST_IMG"
  84 $QEMU_IO -c "open -o driver=raw $TEST_IMG" -c 'write -P 42 128k 512' \
  85     | _filter_qemu_io
  86
  87 # The data should now appear at this guest offset
  88 $QEMU_IO -c 'read -P 42 0x1b200 512' "$TEST_IMG" | _filter_qemu_io
  89
  90 # This cluster is unallocated; fix it
  91 _check_test_img -r all
  92
  93 # This repair operation must have allocated a new refblock; and that refblock
  94 # should not overlap with the unallocated data cluster. If it does, the data
  95 # will be damaged, so check it.
  96 $QEMU_IO -c 'read -P 42 0x1b200 512' "$TEST_IMG" | _filter_qemu_io
  97
  98 echo
  99 echo '=== Repairing refblock beyond the image end ==='
 100 echo
 101
 102 echo
 103 echo '--- Otherwise clean ---'
 104 echo
 105
 106 _make_test_img 64M
 107 # Normally, qemu doesn't create empty refblocks, so we just have to do it by
 108 # hand
 109 # XXX: This should be the entry for the second refblock
 110 poke_file "$TEST_IMG" $((0x10008)) "\x00\x00\x00\x00\x00\x10\x00\x00"
 111 # Mark that refblock as used
 112 # XXX: This should be the 17th entry (cluster 16) of the first
 113 # refblock
 114 poke_file "$TEST_IMG" $((0x20020)) "\x00\x01"
 115 _check_test_img -r all
 116
 117 echo
 118 echo '--- Refblock is unallocated ---'
 119 echo
 120
 121 _make_test_img 64M
 122 poke_file "$TEST_IMG" $((0x10008)) "\x00\x00\x00\x00\x00\x10\x00\x00"
 123 _check_test_img -r all
 124
 125 echo
 126 echo '--- Signed overflow after the refblock ---'
 127 echo
 128
 129 _make_test_img 64M
 130 poke_file "$TEST_IMG" $((0x10008)) "\x7f\xff\xff\xff\xff\xff\x00\x00"
 131 _check_test_img -r all
 132
 133 echo
 134 echo '--- Unsigned overflow after the refblock ---'
 135 echo
 136
 137 _make_test_img 64M
 138 poke_file "$TEST_IMG" $((0x10008)) "\xff\xff\xff\xff\xff\xff\x00\x00"
 139 _check_test_img -r all
 140
 141 # success, all done
 142 echo '*** done'
 143 rm -f $seq.full
 144 status=0