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