tests/qemu-iotests/108

   1 #!/usr/bin/env bash
   2 #
   3 # Test case for repairing qcow2 images which cannot be repaired using
   4 # the on-disk refcount structures
   5 #
   6 # Copyright (C) 2014 Red Hat, Inc.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21
  22 # creator
  23 owner=mreitz@redhat.com
  24
  25 seq="$(basename $0)"
  26 echo "QA output created by $seq"
  27
  28 status=1        # failure is the default!
  29
  30 _cleanup()
  31 {
  32         _cleanup_test_img
  33 }
  34 trap "_cleanup; exit \$status" 0 1 2 3 15
  35
  36 # get standard environment, filters and checks
  37 . ./common.rc
  38 . ./common.filter
  39
  40 # This tests qcow2-specific low-level functionality
  41 _supported_fmt qcow2
  42 _supported_proto file
  43 _supported_os Linux
  44 # This test directly modifies a refblock so it relies on refcount_bits being 16;
  45 # and the low-level modification it performs are not tuned for external data
  46 # files
  47 _unsupported_imgopts 'refcount_bits=\([^1]\|.\([^6]\|$\)\)' data_file
  48
  49 echo
  50 echo '=== Repairing an image without any refcount table ==='
  51 echo
  52
  53 _make_test_img 64M
  54 # just write some data
  55 $QEMU_IO -c 'write -P 42 0 64k' "$TEST_IMG" | _filter_qemu_io
  56
  57 # refcount_table_offset
  58 poke_file "$TEST_IMG" $((0x30)) "\x00\x00\x00\x00\x00\x00\x00\x00"
  59 # refcount_table_clusters
  60 poke_file "$TEST_IMG" $((0x38)) "\x00\x00\x00\x00"
  61
  62 _check_test_img -r all
  63
  64 $QEMU_IO -c 'read -P 42 0 64k' "$TEST_IMG" | _filter_qemu_io
  65
  66 echo
  67 echo '=== Repairing unreferenced data cluster in new refblock area ==='
  68 echo
  69
  70 _make_test_img -o 'cluster_size=512' 64M
  71 # Allocate the first 128 kB in the image (first refblock)
  72 $QEMU_IO -c 'write 0 0x1b200' "$TEST_IMG" | _filter_qemu_io
  73 # should be 131072 == 0x20000
  74 stat -c '%s' "$TEST_IMG"
  75
  76 # Enter a cluster at 128 kB (0x20000)
  77 # XXX: This should be the first free entry in the last L2 table, but we cannot
  78 # be certain
  79 poke_file "$TEST_IMG" $((0x1ccc8)) "\x80\x00\x00\x00\x00\x02\x00\x00"
  80
  81 # Fill the cluster
  82 truncate -s $((0x20200)) "$TEST_IMG"
  83 $QEMU_IO -c "open -o driver=raw $TEST_IMG" -c 'write -P 42 128k 512' \
  84     | _filter_qemu_io
  85
  86 # The data should now appear at this guest offset
  87 $QEMU_IO -c 'read -P 42 0x1b200 512' "$TEST_IMG" | _filter_qemu_io
  88
  89 # This cluster is unallocated; fix it
  90 _check_test_img -r all
  91
  92 # This repair operation must have allocated a new refblock; and that refblock
  93 # should not overlap with the unallocated data cluster. If it does, the data
  94 # will be damaged, so check it.
  95 $QEMU_IO -c 'read -P 42 0x1b200 512' "$TEST_IMG" | _filter_qemu_io
  96
  97 echo
  98 echo '=== Repairing refblock beyond the image end ==='
  99 echo
 100
 101 echo
 102 echo '--- Otherwise clean ---'
 103 echo
 104
 105 _make_test_img 64M
 106 # Normally, qemu doesn't create empty refblocks, so we just have to do it by
 107 # hand
 108 # XXX: This should be the entry for the second refblock
 109 poke_file "$TEST_IMG" $((0x10008)) "\x00\x00\x00\x00\x00\x10\x00\x00"
 110 # Mark that refblock as used
 111 # XXX: This should be the 17th entry (cluster 16) of the first
 112 # refblock
 113 poke_file "$TEST_IMG" $((0x20020)) "\x00\x01"
 114 _check_test_img -r all
 115
 116 echo
 117 echo '--- Refblock is unallocated ---'
 118 echo
 119
 120 _make_test_img 64M
 121 poke_file "$TEST_IMG" $((0x10008)) "\x00\x00\x00\x00\x00\x10\x00\x00"
 122 _check_test_img -r all
 123
 124 echo
 125 echo '--- Signed overflow after the refblock ---'
 126 echo
 127
 128 _make_test_img 64M
 129 poke_file "$TEST_IMG" $((0x10008)) "\x7f\xff\xff\xff\xff\xff\x00\x00"
 130 _check_test_img -r all
 131
 132 echo
 133 echo '--- Unsigned overflow after the refblock ---'
 134 echo
 135
 136 _make_test_img 64M
 137 poke_file "$TEST_IMG" $((0x10008)) "\xff\xff\xff\xff\xff\xff\x00\x00"
 138 _check_test_img -r all
 139
 140 # success, all done
 141 echo '*** done'
 142 rm -f $seq.full
 143 status=0