tests/qemu-iotests/020

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