tests/qemu-iotests/197

   1 #!/usr/bin/env bash
   2 #
   3 # Test case for copy-on-read into qcow2
   4 #
   5 # Copyright (C) 2017 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=eblake@redhat.com
  23
  24 seq="$(basename $0)"
  25 echo "QA output created by $seq"
  26
  27 status=1 # failure is the default!
  28
  29 # get standard environment, filters and checks
  30 . ./common.rc
  31 . ./common.filter
  32
  33 TEST_WRAP="$TEST_DIR/t.wrap.qcow2"
  34 BLKDBG_CONF="$TEST_DIR/blkdebug.conf"
  35
  36 # Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces
  37 # or other problems
  38 case "$TEST_DIR" in
  39     *[^-_a-zA-Z0-9/]*)
  40         _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;;
  41 esac
  42
  43 _cleanup()
  44 {
  45     _cleanup_test_img
  46     _rm_test_img "$TEST_WRAP"
  47     rm -f "$BLKDBG_CONF"
  48 }
  49 trap "_cleanup; exit \$status" 0 1 2 3 15
  50
  51 # Test is supported for any backing file; but we force qcow2 for our wrapper.
  52 _supported_fmt generic
  53 _supported_proto generic
  54 # LUKS support may be possible, but it complicates things.
  55 _unsupported_fmt luks
  56 _unsupported_imgopts "subformat=streamOptimized"
  57
  58 echo
  59 echo '=== Copy-on-read ==='
  60 echo
  61
  62 # Prep the images
  63 # VPC rounds image sizes to a specific geometry, force a specific size.
  64 if [ "$IMGFMT" = "vpc" ]; then
  65     IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size")
  66 fi
  67 _make_test_img 4G
  68 $QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io
  69 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
  70     _make_test_img --no-opts -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create
  71 $QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io
  72
  73 # Ensure that a read of two clusters, but where one is already allocated,
  74 # does not re-write the allocated cluster
  75 cat > "$BLKDBG_CONF" <<EOF
  76 [inject-error]
  77 event = "cor_write"
  78 sector = "2048"
  79 EOF
  80 $QEMU_IO -c "open -C \
  81  -o driver=blkdebug,config=$BLKDBG_CONF,image.driver=qcow2 $TEST_WRAP" \
  82  -c "read -P 0 1M 128k" | _filter_qemu_io
  83
  84 # Read the areas we want copied. A zero-length read should still be a
  85 # no-op.  The next read is under 2G, but aligned so that rounding to
  86 # clusters copies more than 2G of zeroes. The final read will pick up
  87 # the non-zero data in the same cluster.  Since a 2G read may exhaust
  88 # memory on some machines (particularly 32-bit), we skip the test if
  89 # that fails due to memory pressure.
  90 $QEMU_IO -f qcow2 -C -c "read 0 0" "$TEST_WRAP" | _filter_qemu_io
  91 output=$($QEMU_IO -f qcow2 -C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \
  92         "$TEST_WRAP" 2>&1 | _filter_qemu_io)
  93 case $output in
  94     *allocate*)
  95         _notrun "Insufficent memory to run test" ;;
  96     *) printf '%s\n' "$output" ;;
  97 esac
  98 $QEMU_IO -f qcow2 -C -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \
  99     "$TEST_WRAP" | _filter_qemu_io
 100
 101 # Copy-on-read is incompatible with read-only
 102 $QEMU_IO -f qcow2 -C -r "$TEST_WRAP" 2>&1 | _filter_testdir
 103
 104 # Break the backing chain, and show that images are identical, and that
 105 # we properly copied over explicit zeros.
 106 $QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP"
 107 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
 108 _check_test_img
 109 $QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP"
 110
 111 echo
 112 echo '=== Partial final cluster ==='
 113 echo
 114
 115 # Force compat=1.1, because writing zeroes on a v2 image without a
 116 # backing file would just result in an unallocated cluster
 117 # (Also, note that this is really a pure qcow2 test.)
 118 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
 119     _make_test_img --no-opts -o compat=1.1 1024
 120 $QEMU_IO -f qcow2 -C -c 'read 0 1024' "$TEST_WRAP" | _filter_qemu_io
 121 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
 122 _check_test_img
 123
 124 # success, all done
 125 echo '*** done'
 126 status=0