tests/qemu-iotests/020

   1 #!/usr/bin/env bash
   2 #
   3 # Commit changes to backing file
   4 #
   5 # Copyright (C) 2009 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=kwolf@redhat.com
  23
  24 seq=`basename $0`
  25 echo "QA output created by $seq"
  26
  27 status=1        # failure is the default!
  28
  29 _cleanup()
  30 {
  31     _cleanup_test_img
  32     _rm_test_img "$TEST_IMG.base"
  33     _rm_test_img "$TEST_IMG.orig"
  34
  35     _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base"
  36     _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.mid"
  37     _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT"
  38     rmdir "$TEST_DIR/subdir" &> /dev/null
  39 }
  40 trap "_cleanup; exit \$status" 0 1 2 3 15
  41
  42 # get standard environment, filters and checks
  43 . ./common.rc
  44 . ./common.filter
  45 . ./common.pattern
  46
  47 # Any format supporting backing files
  48 _supported_fmt qcow qcow2 vmdk qed
  49 _supported_proto file
  50 _unsupported_imgopts "subformat=monolithicFlat" \
  51                      "subformat=twoGbMaxExtentFlat" \
  52                      "subformat=twoGbMaxExtentSparse" \
  53                      "subformat=streamOptimized"
  54
  55 TEST_OFFSETS="0 4294967296"
  56
  57 TEST_IMG_SAVE="$TEST_IMG"
  58 TEST_IMG="$TEST_IMG.base"
  59
  60 _make_test_img 6G
  61
  62 echo "Filling base image"
  63 echo
  64
  65 for offset in $TEST_OFFSETS; do
  66     # Some clusters with alternating backing file/image file reads
  67     io writev $(( offset )) 512 1024 64
  68
  69     # Complete backing clusters
  70     io writev $(( offset  + 64 * 1024))  65536 65536 1
  71 done
  72 _check_test_img
  73
  74 echo "Creating test image with backing file"
  75 echo
  76
  77 TEST_IMG="$TEST_IMG_SAVE"
  78 _make_test_img -b "$TEST_IMG.base" -F $IMGFMT 6G
  79
  80 echo "Filling test image"
  81 echo
  82
  83 for offset in $TEST_OFFSETS; do
  84     # Some clusters with alternating backing file/image file reads
  85     io writev $(( offset + 512 )) 512 1024 64
  86
  87     # Complete test image clusters
  88     io writev $(( offset + 64 * 1024 + 65536))  65536 65536 1
  89 done
  90 _check_test_img
  91
  92 $QEMU_IMG commit "$TEST_IMG"
  93 TEST_IMG="$TEST_IMG.base"
  94
  95 echo "Reading from the backing file"
  96 echo
  97
  98 for offset in $TEST_OFFSETS; do
  99     # Some clusters with alternating backing file/image file reads
 100     io readv $(( offset )) 512 1024 64
 101     io readv $(( offset + 512 )) 512 1024 64
 102
 103     # Complete test image clusters
 104     io readv $(( offset  + 64 * 1024))  65536 65536 1
 105     io readv $(( offset + 64 * 1024 + 65536))  65536 65536 1
 106
 107     # Empty sectors
 108     io_zero readv $(( offset + 64 * 1024 + 65536 * 4 )) 65536 65536 1
 109 done
 110 _check_test_img
 111 _cleanup
 112 TEST_IMG=$TEST_IMG_SAVE
 113
 114 echo
 115 echo 'Testing failing commit'
 116 echo
 117
 118 TEST_IMG="$TEST_IMG.base" _make_test_img 1M
 119
 120 # Create an image with a null backing file to which committing will fail (with
 121 # ENOSPC so we can distinguish the result from some generic EIO which may be
 122 # generated anywhere in the block layer)
 123 backing="json:{'driver': '$IMGFMT',
 124                'file': {
 125                    'driver': 'blkdebug',
 126                    'inject-error': [{
 127                        'event': 'write_aio',
 128                        'errno': 28,
 129                        'once': true
 130                    }],
 131                    'image': {
 132                        'driver': 'file',
 133                        'filename': '$TEST_IMG.base'
 134                    }}}"
 135
 136 # Filter out newlines and collapse spaces
 137 backing=$(echo "$backing" | tr -d '\n' | tr -s ' ')
 138
 139 _make_test_img -b "$backing" -F $IMGFMT
 140
 141 # Just write anything so committing will not be a no-op
 142 $QEMU_IO -c 'writev 0 64k' "$TEST_IMG" | _filter_qemu_io
 143
 144 $QEMU_IMG commit "$TEST_IMG"
 145 _cleanup
 146
 147
 148 echo
 149 echo 'Testing commit in sub-directory with relative filenames'
 150 echo
 151
 152 pushd "$TEST_DIR" > /dev/null
 153
 154 mkdir subdir
 155
 156 TEST_IMG="subdir/t.$IMGFMT.base" _make_test_img 1M
 157 TEST_IMG="subdir/t.$IMGFMT.mid" _make_test_img -b "t.$IMGFMT.base" -F $IMGFMT
 158 TEST_IMG="subdir/t.$IMGFMT" _make_test_img -b "t.$IMGFMT.mid" -F $IMGFMT
 159
 160 # Should work
 161 $QEMU_IMG commit -b "t.$IMGFMT.mid" "subdir/t.$IMGFMT"
 162
 163 # Might theoretically work, but does not in practice (we have to
 164 # decide between this and the above; and since we always represent
 165 # backing file names as relative to the overlay, we go for the above)
 166 $QEMU_IMG commit -b "subdir/t.$IMGFMT.mid" "subdir/t.$IMGFMT" 2>&1 | \
 167     _filter_imgfmt
 168
 169 # This should work as well
 170 $QEMU_IMG commit -b "$TEST_DIR/subdir/t.$IMGFMT.mid" "subdir/t.$IMGFMT"
 171
 172 popd > /dev/null
 173
 174 # Now let's try with just absolute filenames
 175 # (This will not work with external data files, though, because when
 176 # using relative paths for those, qemu will always resolve them
 177 # relative to its CWD.  Therefore, it cannot find those data files now
 178 # that we left $TEST_DIR.)
 179 if _get_data_file '' > /dev/null; then
 180     echo 'Image committed.' # Skip test
 181 else
 182     $QEMU_IMG commit -b "$TEST_DIR/subdir/t.$IMGFMT.mid" \
 183         "$TEST_DIR/subdir/t.$IMGFMT"
 184 fi
 185
 186 # success, all done
 187 echo "*** done"
 188 rm -f $seq.full
 189 status=0