tests/qemu-iotests/066

   1 #!/bin/bash
   2 #
   3 # Test case for preallocated zero clusters in qcow2
   4 #
   5 # Copyright (C) 2013 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=mreitz@redhat.com
  23
  24 seq="$(basename $0)"
  25 echo "QA output created by $seq"
  26
  27 here="$PWD"
  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 qocw2-specific low-level functionality
  41 _supported_fmt qcow2
  42 _supported_proto generic
  43 _supported_os Linux
  44
  45 # Intentionally create an unaligned image
  46 IMGOPTS="compat=1.1"
  47 IMG_SIZE=$((64 * 1024 * 1024 + 512))
  48
  49 echo
  50 echo "=== Testing cluster discards ==="
  51 echo
  52 _make_test_img $IMG_SIZE
  53 # Write some normal clusters, zero some of them (creating preallocated
  54 # zero clusters) and discard everything. Everything should now read as 0.
  55 $QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \
  56          -c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \
  57          | _filter_qemu_io
  58
  59 # Check the image (there shouldn't be any leaks)
  60 _check_test_img
  61 # Map the image (we want all clusters to be gone)
  62 $QEMU_IMG map "$TEST_IMG"
  63
  64 _cleanup_test_img
  65
  66
  67 echo
  68 echo '=== Writing to preallocated zero clusters ==='
  69 echo
  70
  71 _make_test_img $IMG_SIZE
  72
  73 # Create data clusters (not aligned to an L2 table)
  74 $QEMU_IO -c 'write -P 42 1M 256k' "$TEST_IMG" | _filter_qemu_io
  75 orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
  76
  77 # Convert the data clusters to preallocated zero clusters
  78 $QEMU_IO -c 'write -z 1M 256k' "$TEST_IMG" | _filter_qemu_io
  79
  80 # Now write to them (with a COW needed for the head and tail)
  81 $QEMU_IO -c "write -P 23 $(((1024 + 32) * 1024)) 192k" "$TEST_IMG" \
  82     | _filter_qemu_io
  83
  84 # Check metadata correctness
  85 _check_test_img
  86
  87 # Check data correctness
  88 $QEMU_IO -c "read -P  0 $(( 1024             * 1024)) 32k" \
  89          -c "read -P 23 $(((1024 + 32)       * 1024)) 192k" \
  90          -c "read -P  0 $(((1024 + 32 + 192) * 1024)) 32k" \
  91          "$TEST_IMG" \
  92          | _filter_qemu_io
  93
  94 # Check that we have actually reused the original area
  95 new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
  96 if [ "$new_map" = "$orig_map" ]; then
  97     echo 'Successfully reused original clusters.'
  98 else
  99     echo 'Failed to reuse original clusters.'
 100     echo 'Original map:'
 101     echo "$orig_map"
 102     echo 'New map:'
 103     echo "$new_map"
 104 fi
 105
 106 _cleanup_test_img
 107
 108
 109 echo
 110 echo '=== Writing to a snapshotted preallocated zero cluster ==='
 111 echo
 112
 113 _make_test_img 64k
 114
 115 # Create a preallocated zero cluster
 116 $QEMU_IO -c 'write -P 42 0 64k' -c 'write -z 0 64k' "$TEST_IMG" \
 117     | _filter_qemu_io
 118
 119 # Snapshot it
 120 $QEMU_IMG snapshot -c foo "$TEST_IMG"
 121
 122 # Write to the cluster
 123 $QEMU_IO -c 'write -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
 124
 125 # Check metadata correctness
 126 _check_test_img
 127
 128 # Check data correctness
 129 $QEMU_IO -c 'read -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
 130 $QEMU_IMG snapshot -a foo "$TEST_IMG"
 131 $QEMU_IO -c 'read -P 0 0 64k' "$TEST_IMG" | _filter_qemu_io
 132
 133 _cleanup_test_img
 134
 135
 136 echo
 137 echo '=== Consecutive write to a preallocated zero cluster ==='
 138 echo
 139
 140 _make_test_img 192k
 141
 142 # Create three normal clusters
 143 $QEMU_IO -c 'write -P 42 0 192k' "$TEST_IMG" | _filter_qemu_io
 144 orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
 145
 146 # Make the middle cluster a preallocated zero cluster
 147 $QEMU_IO -c 'write -z 64k 64k' "$TEST_IMG" | _filter_qemu_io
 148
 149 # Try to overwrite everything: This should reuse the whole range. To test that
 150 # this only issues a single continuous write request, use blkdebug.
 151 $QEMU_IO -c 'write -P 42 0 192k' \
 152     "json:{
 153         'driver': '$IMGFMT',
 154         'file': {
 155             'driver': 'blkdebug',
 156             'image.filename': '$TEST_IMG',
 157             'set-state': [{
 158                 'event': 'write_aio',
 159                 'new_state': 2
 160             }],
 161             'inject-error': [{
 162                 'event': 'write_aio',
 163                 'state': 2
 164             }]
 165         }
 166     }" \
 167     | _filter_qemu_io
 168
 169 # Check metadata correctness
 170 _check_test_img
 171
 172 # Check that we have actually reused the original area
 173 new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
 174 if [ "$new_map" = "$orig_map" ]; then
 175     echo 'Successfully reused original clusters.'
 176 else
 177     echo 'Failed to reuse original clusters.'
 178     echo 'Original map:'
 179     echo "$orig_map"
 180     echo 'New map:'
 181     echo "$new_map"
 182 fi
 183
 184 _cleanup_test_img
 185
 186
 187 # success, all done
 188 echo "*** done"
 189 rm -f $seq.full
 190 status=0