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 $seq"
  26
  27 status=1        # failure is the default!
  28
  29 _cleanup()
  30 {
  31         _cleanup_test_img
  32 }
  33 trap "_cleanup; exit \$status" 0 1 2 3 15
  34
  35 # get standard environment, filters and checks
  36 . ./common.rc
  37 . ./common.filter
  38
  39 # This tests qocw2-specific low-level functionality
  40 _supported_fmt qcow2
  41 _supported_proto generic
  42
  43 # Intentionally create an unaligned image
  44 IMGOPTS="compat=1.1"
  45 IMG_SIZE=$((64 * 1024 * 1024 + 512))
  46
  47 echo
  48 echo "=== Testing cluster discards ==="
  49 echo
  50 _make_test_img $IMG_SIZE
  51 # Write some normal clusters, zero some of them (creating preallocated
  52 # zero clusters) and discard everything. Everything should now read as 0.
  53 $QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \
  54          -c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \
  55          | _filter_qemu_io
  56
  57 # Check the image (there shouldn't be any leaks)
  58 _check_test_img
  59 # Map the image (we want all clusters to be gone)
  60 $QEMU_IMG map "$TEST_IMG"
  61
  62 _cleanup_test_img
  63
  64
  65 echo
  66 echo '=== Writing to preallocated zero clusters ==='
  67 echo
  68
  69 _make_test_img $IMG_SIZE
  70
  71 # Create data clusters (not aligned to an L2 table)
  72 $QEMU_IO -c 'write -P 42 1M 256k' "$TEST_IMG" | _filter_qemu_io
  73 orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
  74
  75 # Convert the data clusters to preallocated zero clusters
  76 $QEMU_IO -c 'write -z 1M 256k' "$TEST_IMG" | _filter_qemu_io
  77
  78 # Now write to them (with a COW needed for the head and tail)
  79 $QEMU_IO -c "write -P 23 $(((1024 + 32) * 1024)) 192k" "$TEST_IMG" \
  80     | _filter_qemu_io
  81
  82 # Check metadata correctness
  83 _check_test_img
  84
  85 # Check data correctness
  86 $QEMU_IO -c "read -P  0 $(( 1024             * 1024)) 32k" \
  87          -c "read -P 23 $(((1024 + 32)       * 1024)) 192k" \
  88          -c "read -P  0 $(((1024 + 32 + 192) * 1024)) 32k" \
  89          "$TEST_IMG" \
  90          | _filter_qemu_io
  91
  92 # Check that we have actually reused the original area
  93 new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
  94 if [ "$new_map" = "$orig_map" ]; then
  95     echo 'Successfully reused original clusters.'
  96 else
  97     echo 'Failed to reuse original clusters.'
  98     echo 'Original map:'
  99     echo "$orig_map"
 100     echo 'New map:'
 101     echo "$new_map"
 102 fi
 103
 104 _cleanup_test_img
 105
 106
 107 echo
 108 echo '=== Writing to a snapshotted preallocated zero cluster ==='
 109 echo
 110
 111 _make_test_img 64k
 112
 113 # Create a preallocated zero cluster
 114 $QEMU_IO -c 'write -P 42 0 64k' -c 'write -z 0 64k' "$TEST_IMG" \
 115     | _filter_qemu_io
 116
 117 # Snapshot it
 118 $QEMU_IMG snapshot -c foo "$TEST_IMG"
 119
 120 # Write to the cluster
 121 $QEMU_IO -c 'write -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
 122
 123 # Check metadata correctness
 124 _check_test_img
 125
 126 # Check data correctness
 127 $QEMU_IO -c 'read -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io
 128 $QEMU_IMG snapshot -a foo "$TEST_IMG"
 129 $QEMU_IO -c 'read -P 0 0 64k' "$TEST_IMG" | _filter_qemu_io
 130
 131 _cleanup_test_img
 132
 133
 134 echo
 135 echo '=== Consecutive write to a preallocated zero cluster ==='
 136 echo
 137
 138 _make_test_img 192k
 139
 140 # Create three normal clusters
 141 $QEMU_IO -c 'write -P 42 0 192k' "$TEST_IMG" | _filter_qemu_io
 142 orig_map=$($QEMU_IMG map --output=json "$TEST_IMG")
 143
 144 # Make the middle cluster a preallocated zero cluster
 145 $QEMU_IO -c 'write -z 64k 64k' "$TEST_IMG" | _filter_qemu_io
 146
 147 # Try to overwrite everything: This should reuse the whole range. To test that
 148 # this only issues a single continuous write request, use blkdebug.
 149 $QEMU_IO -c 'write -P 42 0 192k' \
 150     "json:{
 151         'driver': '$IMGFMT',
 152         'file': {
 153             'driver': 'blkdebug',
 154             'image.filename': '$TEST_IMG',
 155             'set-state': [{
 156                 'event': 'write_aio',
 157                 'new_state': 2
 158             }],
 159             'inject-error': [{
 160                 'event': 'write_aio',
 161                 'state': 2
 162             }]
 163         }
 164     }" \
 165     | _filter_qemu_io
 166
 167 # Check metadata correctness
 168 _check_test_img
 169
 170 # Check that we have actually reused the original area
 171 new_map=$($QEMU_IMG map --output=json "$TEST_IMG")
 172 if [ "$new_map" = "$orig_map" ]; then
 173     echo 'Successfully reused original clusters.'
 174 else
 175     echo 'Failed to reuse original clusters.'
 176     echo 'Original map:'
 177     echo "$orig_map"
 178     echo 'New map:'
 179     echo "$new_map"
 180 fi
 181
 182 _cleanup_test_img
 183
 184
 185 # success, all done
 186 echo "*** done"
 187 rm -f $seq.full
 188 status=0