tests/qemu-iotests/066

   1 #!/usr/bin/env 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 $seq"
  26
  27 status=1        # failure is the default!
  28
  29 _cleanup()
  30 {
  31         _cleanup_test_img
  32 }
  33 trap "_cleanup; exit \$status" 0 1 2 3 15
  34
  35 # get standard environment, filters and checks
  36 . ./common.rc
  37 . ./common.filter
  38
  39 # This tests qcow2-specific low-level functionality
  40 _supported_fmt qcow2
  41 _supported_proto generic
  42 # We need zero clusters and snapshots
  43 _unsupported_imgopts 'compat=0.10' 'refcount_bits=1[^0-9]'
  44
  45 # Intentionally create an unaligned image
  46 IMG_SIZE=$((64 * 1024 * 1024 + 512))
  47
  48 echo
  49 echo "=== Testing cluster discards ==="
  50 echo
  51 _make_test_img $IMG_SIZE
  52 # Write some normal clusters, zero some of them (creating preallocated
  53 # zero clusters) and discard everything. Everything should now read as 0.
  54 $QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \
  55          -c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \
  56          | _filter_qemu_io
  57
  58 # Check the image (there shouldn't be any leaks)
  59 _check_test_img
  60 # Map the image (we want all clusters to be gone)
  61 $QEMU_IMG map "$TEST_IMG"
  62
  63 _cleanup_test_img
  64
  65
  66 echo
  67 echo '=== Writing to preallocated zero clusters ==='
  68 echo
  69
  70 _make_test_img $IMG_SIZE
  71
  72 # Create data clusters (not aligned to an L2 table)
  73 $QEMU_IO -c 'write -P 42 1M 256k' "$TEST_IMG" | _filter_qemu_io
  74 orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
  75
  76 # Convert the data clusters to preallocated zero clusters
  77 $QEMU_IO -c 'write -z 1M 256k' "$TEST_IMG" | _filter_qemu_io
  78
  79 # Now write to them (with a COW needed for the head and tail)
  80 $QEMU_IO -c "write -P 23 $(((1024 + 32) * 1024)) 192k" "$TEST_IMG" \
  81     | _filter_qemu_io
  82
  83 # Check metadata correctness
  84 _check_test_img
  85
  86 # Check data correctness
  87 $QEMU_IO -c "read -P  0 $(( 1024             * 1024)) 32k" \
  88          -c "read -P 23 $(((1024 + 32)       * 1024)) 192k" \
  89          -c "read -P  0 $(((1024 + 32 + 192) * 1024)) 32k" \
  90          "$TEST_IMG" \
  91          | _filter_qemu_io
  92
  93 # Check that we have actually reused the original area
  94 new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
  95 if [ "$new_map" = "$orig_map" ]; then
  96     echo 'Successfully reused original clusters.'
  97 else
  98     echo 'Failed to reuse original clusters.'
  99     echo 'Original map:'
 100     echo "$orig_map"
 101     echo 'New map:'
 102     echo "$new_map"
 103 fi
 104
 105 _cleanup_test_img
 106
 107
 108 echo
 109 echo '=== Writing to a snapshotted preallocated zero cluster ==='
 110 echo
 111
 112 _make_test_img 64k
 113
 114 # Create a preallocated zero cluster
 115 $QEMU_IO -c 'write -P 42 0 64k' -c 'write -z 0 64k' "$TEST_IMG" \
 116     | _filter_qemu_io
 117
 118 # Snapshot it
 119 $QEMU_IMG snapshot -c foo "$TEST_IMG"
 120
 121 # Write to the cluster
 122 $QEMU_IO -c 'write -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
 123
 124 # Check metadata correctness
 125 _check_test_img
 126
 127 # Check data correctness
 128 $QEMU_IO -c 'read -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
 129 $QEMU_IMG snapshot -a foo "$TEST_IMG"
 130 $QEMU_IO -c 'read -P 0 0 64k' "$TEST_IMG" | _filter_qemu_io
 131
 132 _cleanup_test_img
 133
 134
 135 echo
 136 echo '=== Consecutive write to a preallocated zero cluster ==='
 137 echo
 138
 139 _make_test_img 192k
 140
 141 # Create three normal clusters
 142 $QEMU_IO -c 'write -P 42 0 192k' "$TEST_IMG" | _filter_qemu_io
 143 orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
 144
 145 # Make the middle cluster a preallocated zero cluster
 146 $QEMU_IO -c 'write -z 64k 64k' "$TEST_IMG" | _filter_qemu_io
 147
 148 # Try to overwrite everything: This should reuse the whole range. To test that
 149 # this only issues a single continuous write request, use blkdebug.
 150 $QEMU_IO -c 'write -P 42 0 192k' \
 151     "json:{
 152         'driver': '$IMGFMT',
 153         'file': {
 154             'driver': 'blkdebug',
 155             'image.filename': '$TEST_IMG',
 156             'set-state': [{
 157                 'event': 'write_aio',
 158                 'new_state': 2
 159             }],
 160             'inject-error': [{
 161                 'event': 'write_aio',
 162                 'state': 2
 163             }]
 164         }
 165     }" \
 166     | _filter_qemu_io
 167
 168 # Check metadata correctness
 169 _check_test_img
 170
 171 # Check that we have actually reused the original area
 172 new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
 173 if [ "$new_map" = "$orig_map" ]; then
 174     echo 'Successfully reused original clusters.'
 175 else
 176     echo 'Failed to reuse original clusters.'
 177     echo 'Original map:'
 178     echo "$orig_map"
 179     echo 'New map:'
 180     echo "$new_map"
 181 fi
 182
 183 _cleanup_test_img
 184
 185
 186 # success, all done
 187 echo "*** done"
 188 rm -f $seq.full
 189 status=0