tests/qemu-iotests/108

   1 #!/bin/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 $seq"
  27
  28 here="$PWD"
  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 # This test directly modifies a refblock so it relies on refcount_bits being 16
  46 _unsupported_imgopts 'refcount_bits=\([^1]\|.\([^6]\|$\)\)'
  47
  48 echo
  49 echo '=== Repairing an image without any refcount table ==='
  50 echo
  51
  52 _make_test_img 64M
  53 # just write some data
  54 $QEMU_IO -c 'write -P 42 0 64k' "$TEST_IMG" | _filter_qemu_io
  55
  56 # refcount_table_offset
  57 poke_file "$TEST_IMG" $((0x30)) "\x00\x00\x00\x00\x00\x00\x00\x00"
  58 # refcount_table_clusters
  59 poke_file "$TEST_IMG" $((0x38)) "\x00\x00\x00\x00"
  60
  61 _check_test_img -r all
  62
  63 $QEMU_IO -c 'read -P 42 0 64k' "$TEST_IMG" | _filter_qemu_io
  64
  65 echo
  66 echo '=== Repairing unreferenced data cluster in new refblock area ==='
  67 echo
  68
  69 IMGOPTS='cluster_size=512' _make_test_img 64M
  70 # Allocate the first 128 kB in the image (first refblock)
  71 $QEMU_IO -c 'write 0 0x1b200' "$TEST_IMG" | _filter_qemu_io
  72 # should be 131072 == 0x20000
  73 stat -c '%s' "$TEST_IMG"
  74
  75 # Enter a cluster at 128 kB (0x20000)
  76 # XXX: This should be the first free entry in the last L2 table, but we cannot
  77 # be certain
  78 poke_file "$TEST_IMG" $((0x1ccc8)) "\x80\x00\x00\x00\x00\x02\x00\x00"
  79
  80 # Fill the cluster
  81 truncate -s $((0x20200)) "$TEST_IMG"
  82 $QEMU_IO -c "open -o driver=raw $TEST_IMG" -c 'write -P 42 128k 512' \
  83     | _filter_qemu_io
  84
  85 # The data should now appear at this guest offset
  86 $QEMU_IO -c 'read -P 42 0x1b200 512' "$TEST_IMG" | _filter_qemu_io
  87
  88 # This cluster is unallocated; fix it
  89 _check_test_img -r all
  90
  91 # This repair operation must have allocated a new refblock; and that refblock
  92 # should not overlap with the unallocated data cluster. If it does, the data
  93 # will be damaged, so check it.
  94 $QEMU_IO -c 'read -P 42 0x1b200 512' "$TEST_IMG" | _filter_qemu_io
  95
  96 echo
  97 echo '=== Repairing refblock beyond the image end ==='
  98 echo
  99
 100 echo
 101 echo '--- Otherwise clean ---'
 102 echo
 103
 104 _make_test_img 64M
 105 # Normally, qemu doesn't create empty refblocks, so we just have to do it by
 106 # hand
 107 # XXX: This should be the entry for the second refblock
 108 poke_file "$TEST_IMG" $((0x10008)) "\x00\x00\x00\x00\x00\x10\x00\x00"
 109 # Mark that refblock as used
 110 # XXX: This should be the 17th entry (cluster 16) of the first
 111 # refblock
 112 poke_file "$TEST_IMG" $((0x20020)) "\x00\x01"
 113 _check_test_img -r all
 114
 115 echo
 116 echo '--- Refblock is unallocated ---'
 117 echo
 118
 119 _make_test_img 64M
 120 poke_file "$TEST_IMG" $((0x10008)) "\x00\x00\x00\x00\x00\x10\x00\x00"
 121 _check_test_img -r all
 122
 123 echo
 124 echo '--- Signed overflow after the refblock ---'
 125 echo
 126
 127 _make_test_img 64M
 128 poke_file "$TEST_IMG" $((0x10008)) "\x7f\xff\xff\xff\xff\xff\x00\x00"
 129 _check_test_img -r all
 130
 131 echo
 132 echo '--- Unsigned overflow after the refblock ---'
 133 echo
 134
 135 _make_test_img 64M
 136 poke_file "$TEST_IMG" $((0x10008)) "\xff\xff\xff\xff\xff\xff\x00\x00"
 137 _check_test_img -r all
 138
 139 # success, all done
 140 echo '*** done'
 141 rm -f $seq.full
 142 status=0