tests/qemu-iotests/197

   1 #!/usr/bin/env bash
   2 # group: rw quick
   3 #
   4 # Test case for copy-on-read into qcow2
   5 #
   6 # Copyright (C) 2017 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=eblake@redhat.com
  24
  25 seq="$(basename $0)"
  26 echo "QA output created by $seq"
  27
  28 status=1 # failure is the default!
  29
  30 # get standard environment, filters and checks
  31 . ./common.rc
  32 . ./common.filter
  33
  34 TEST_WRAP="$TEST_DIR/t.wrap.qcow2"
  35 BLKDBG_CONF="$TEST_DIR/blkdebug.conf"
  36
  37 # Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces
  38 # or other problems
  39 case "$TEST_DIR" in
  40     *[^-_a-zA-Z0-9/]*)
  41         _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;;
  42 esac
  43
  44 _cleanup()
  45 {
  46     _cleanup_test_img
  47     _rm_test_img "$TEST_WRAP"
  48     rm -f "$BLKDBG_CONF"
  49 }
  50 trap "_cleanup; exit \$status" 0 1 2 3 15
  51
  52 # Test is supported for any backing file; but we force qcow2 for our wrapper.
  53 _supported_fmt generic
  54 _supported_proto generic
  55 # LUKS support may be possible, but it complicates things.
  56 _unsupported_fmt luks
  57 _unsupported_imgopts "subformat=streamOptimized"
  58
  59 echo
  60 echo '=== Copy-on-read ==='
  61 echo
  62
  63 # Prep the images
  64 # VPC rounds image sizes to a specific geometry, force a specific size.
  65 if [ "$IMGFMT" = "vpc" ]; then
  66     IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size")
  67 fi
  68 _make_test_img 4G
  69 $QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io
  70 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
  71     _make_test_img --no-opts -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create
  72 $QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io
  73
  74 # Ensure that a read of two clusters, but where one is already allocated,
  75 # does not re-write the allocated cluster
  76 cat > "$BLKDBG_CONF" <<EOF
  77 [inject-error]
  78 event = "cor_write"
  79 sector = "2048"
  80 EOF
  81 $QEMU_IO -c "open -C \
  82  -o driver=blkdebug,config=$BLKDBG_CONF,image.driver=qcow2 $TEST_WRAP" \
  83  -c "read -P 0 1M 128k" | _filter_qemu_io
  84
  85 # Read the areas we want copied. A zero-length read should still be a
  86 # no-op.  The next read is under 2G, but aligned so that rounding to
  87 # clusters copies more than 2G of zeroes. The final read will pick up
  88 # the non-zero data in the same cluster.  Since a 2G read may exhaust
  89 # memory on some machines (particularly 32-bit), we skip the test if
  90 # that fails due to memory pressure.
  91 $QEMU_IO -f qcow2 -C -c "read 0 0" "$TEST_WRAP" | _filter_qemu_io
  92 output=$($QEMU_IO -f qcow2 -C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \
  93         "$TEST_WRAP" 2>&1 | _filter_qemu_io)
  94 case $output in
  95     *allocate*)
  96         _notrun "Insufficient memory to run test" ;;
  97     *) printf '%s\n' "$output" ;;
  98 esac
  99 $QEMU_IO -f qcow2 -C -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \
 100     "$TEST_WRAP" | _filter_qemu_io
 101
 102 # Copy-on-read is incompatible with read-only
 103 $QEMU_IO -f qcow2 -C -r "$TEST_WRAP" 2>&1 | _filter_testdir
 104
 105 # Break the backing chain, and show that images are identical, and that
 106 # we properly copied over explicit zeros.
 107 $QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP"
 108 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
 109 _check_test_img
 110 $QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP"
 111
 112 echo
 113 echo '=== Partial final cluster ==='
 114 echo
 115
 116 # Force compat=1.1, because writing zeroes on a v2 image without a
 117 # backing file would just result in an unallocated cluster
 118 # (Also, note that this is really a pure qcow2 test.)
 119 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
 120     _make_test_img --no-opts -o compat=1.1 1024
 121 $QEMU_IO -f qcow2 -C -c 'read 0 1024' "$TEST_WRAP" | _filter_qemu_io
 122 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
 123 _check_test_img
 124
 125 echo
 126 echo '=== Copy-on-read with subclusters ==='
 127 echo
 128
 129 # Create base and top images 64K (1 cluster) each.  Make subclusters enabled
 130 # for the top image
 131 _make_test_img 64K
 132 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
 133     _make_test_img --no-opts -o extended_l2=true -F "$IMGFMT" -b "$TEST_IMG" \
 134     64K | _filter_img_create
 135
 136 $QEMU_IO -c "write -P 0xaa 0 64k" "$TEST_IMG" | _filter_qemu_io
 137
 138 # Allocate individual subclusters in the top image, and not the whole cluster
 139 $QEMU_IO -f qcow2 -c "write -P 0xbb 28K 2K" -c "write -P 0xcc 34K 2K" "$TEST_WRAP" \
 140     | _filter_qemu_io
 141
 142 # Only 2 subclusters should be allocated in the top image at this point
 143 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
 144
 145 # Actual copy-on-read operation
 146 $QEMU_IO -f qcow2 -C -c "read -P 0xaa 30K 4K" "$TEST_WRAP" | _filter_qemu_io
 147
 148 # And here we should have 4 subclusters allocated right in the middle of the
 149 # top image. Make sure the whole cluster remains unallocated
 150 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
 151
 152 _check_test_img
 153
 154 # success, all done
 155 echo '*** done'
 156 status=0