tests/qemu-iotests/066

   1 #!/usr/bin/env bash
   2 # group: rw auto quick
   3 #
   4 # Test case for preallocated zero clusters in qcow2
   5 #
   6 # Copyright (C) 2013 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=hreitz@redhat.com
  24
  25 seq="$(basename $0)"
  26 echo "QA output created by $seq"
  27
  28 status=1        # failure is the default!
  29
  30 _cleanup()
  31 {
  32         _cleanup_test_img
  33 }
  34 trap "_cleanup; exit \$status" 0 1 2 3 15
  35
  36 # get standard environment, filters and checks
  37 . ./common.rc
  38 . ./common.filter
  39
  40 # This tests qcow2-specific low-level functionality
  41 _supported_fmt qcow2
  42 _supported_proto generic
  43 # We need zero clusters and snapshots
  44 # (TODO: Consider splitting the snapshot part into a separate test
  45 #        file, so this one runs with refcount_bits=1 and data_file)
  46 _unsupported_imgopts 'compat=0.10' 'refcount_bits=1[^0-9]' data_file
  47
  48 # Intentionally create an unaligned image
  49 IMG_SIZE=$((64 * 1024 * 1024 + 512))
  50
  51 echo
  52 echo "=== Testing cluster discards ==="
  53 echo
  54 _make_test_img $IMG_SIZE
  55 # Write some normal clusters, zero some of them (creating preallocated
  56 # zero clusters) and discard everything. Everything should now read as 0.
  57 $QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \
  58          -c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \
  59          | _filter_qemu_io
  60
  61 # Check the image (there shouldn't be any leaks)
  62 _check_test_img
  63 # Map the image (we want all clusters to be gone)
  64 $QEMU_IMG map "$TEST_IMG"
  65
  66 _cleanup_test_img
  67
  68
  69 echo
  70 echo '=== Writing to preallocated zero clusters ==='
  71 echo
  72
  73 _make_test_img $IMG_SIZE
  74
  75 # Create data clusters (not aligned to an L2 table)
  76 $QEMU_IO -c 'write -P 42 1M 256k' "$TEST_IMG" | _filter_qemu_io
  77 orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
  78
  79 # Convert the data clusters to preallocated zero clusters
  80 $QEMU_IO -c 'write -z 1M 256k' "$TEST_IMG" | _filter_qemu_io
  81
  82 # Now write to them (with a COW needed for the head and tail)
  83 $QEMU_IO -c "write -P 23 $(((1024 + 32) * 1024)) 192k" "$TEST_IMG" \
  84     | _filter_qemu_io
  85
  86 # Check metadata correctness
  87 _check_test_img
  88
  89 # Check data correctness
  90 $QEMU_IO -c "read -P  0 $(( 1024             * 1024)) 32k" \
  91          -c "read -P 23 $(((1024 + 32)       * 1024)) 192k" \
  92          -c "read -P  0 $(((1024 + 32 + 192) * 1024)) 32k" \
  93          "$TEST_IMG" \
  94          | _filter_qemu_io
  95
  96 # Check that we have actually reused the original area
  97 new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
  98 if [ "$new_map" = "$orig_map" ]; then
  99     echo 'Successfully reused original clusters.'
 100 else
 101     echo 'Failed to reuse original clusters.'
 102     echo 'Original map:'
 103     echo "$orig_map"
 104     echo 'New map:'
 105     echo "$new_map"
 106 fi
 107
 108 _cleanup_test_img
 109
 110
 111 echo
 112 echo '=== Writing to a snapshotted preallocated zero cluster ==='
 113 echo
 114
 115 _make_test_img 64k
 116
 117 # Create a preallocated zero cluster
 118 $QEMU_IO -c 'write -P 42 0 64k' -c 'write -z 0 64k' "$TEST_IMG" \
 119     | _filter_qemu_io
 120
 121 # Snapshot it
 122 $QEMU_IMG snapshot -c foo "$TEST_IMG"
 123
 124 # Write to the cluster
 125 $QEMU_IO -c 'write -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
 126
 127 # Check metadata correctness
 128 _check_test_img
 129
 130 # Check data correctness
 131 $QEMU_IO -c 'read -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
 132 $QEMU_IMG snapshot -a foo "$TEST_IMG"
 133 $QEMU_IO -c 'read -P 0 0 64k' "$TEST_IMG" | _filter_qemu_io
 134
 135 _cleanup_test_img
 136
 137
 138 echo
 139 echo '=== Consecutive write to a preallocated zero cluster ==='
 140 echo
 141
 142 _make_test_img 192k
 143
 144 # Create three normal clusters
 145 $QEMU_IO -c 'write -P 42 0 192k' "$TEST_IMG" | _filter_qemu_io
 146 orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
 147
 148 # Make the middle cluster a preallocated zero cluster
 149 $QEMU_IO -c 'write -z 64k 64k' "$TEST_IMG" | _filter_qemu_io
 150
 151 # Try to overwrite everything: This should reuse the whole range. To test that
 152 # this only issues a single continuous write request, use blkdebug.
 153 $QEMU_IO -c 'write -P 42 0 192k' \
 154     "json:{
 155         'driver': '$IMGFMT',
 156         'file': {
 157             'driver': 'blkdebug',
 158             'image.filename': '$TEST_IMG',
 159             'set-state': [{
 160                 'event': 'write_aio',
 161                 'new_state': 2
 162             }],
 163             'inject-error': [{
 164                 'event': 'write_aio',
 165                 'state': 2
 166             }]
 167         }
 168     }" \
 169     | _filter_qemu_io
 170
 171 # Check metadata correctness
 172 _check_test_img
 173
 174 # Check that we have actually reused the original area
 175 new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
 176 if [ "$new_map" = "$orig_map" ]; then
 177     echo 'Successfully reused original clusters.'
 178 else
 179     echo 'Failed to reuse original clusters.'
 180     echo 'Original map:'
 181     echo "$orig_map"
 182     echo 'New map:'
 183     echo "$new_map"
 184 fi
 185
 186 _cleanup_test_img
 187
 188
 189 # success, all done
 190 echo "*** done"
 191 rm -f $seq.full
 192 status=0