tests/qemu-iotests/215

   1 #!/usr/bin/env bash
   2 #
   3 # Test case for copy-on-read into qcow2, using the COR filter driver
   4 #
   5 # Copyright (C) 2018 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 seq="$(basename $0)"
  22 echo "QA output created by $seq"
  23
  24 status=1 # failure is the default!
  25
  26 # get standard environment, filters and checks
  27 . ./common.rc
  28 . ./common.filter
  29
  30 TEST_WRAP="$TEST_DIR/t.wrap.qcow2"
  31 BLKDBG_CONF="$TEST_DIR/blkdebug.conf"
  32
  33 # Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces
  34 # or other problems
  35 case "$TEST_DIR" in
  36     *[^-_a-zA-Z0-9/]*)
  37         _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;;
  38 esac
  39
  40 _cleanup()
  41 {
  42     _cleanup_test_img
  43     rm -f "$TEST_WRAP"
  44     rm -f "$BLKDBG_CONF"
  45 }
  46 trap "_cleanup; exit \$status" 0 1 2 3 15
  47
  48 # Test is supported for any backing file; but we force qcow2 for our wrapper.
  49 _supported_fmt generic
  50 _supported_proto generic
  51 # LUKS support may be possible, but it complicates things.
  52 _unsupported_fmt luks
  53
  54 echo
  55 echo '=== Copy-on-read ==='
  56 echo
  57
  58 # Prep the images
  59 # VPC rounds image sizes to a specific geometry, force a specific size.
  60 if [ "$IMGFMT" = "vpc" ]; then
  61     IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size")
  62 fi
  63 _make_test_img 4G
  64 $QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io
  65 IMGPROTO=file IMGFMT=qcow2 IMGOPTS= TEST_IMG_FILE="$TEST_WRAP" \
  66     _make_test_img -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create
  67 $QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io
  68
  69 # Ensure that a read of two clusters, but where one is already allocated,
  70 # does not re-write the allocated cluster
  71 cat > "$BLKDBG_CONF" <<EOF
  72 [inject-error]
  73 event = "cor_write"
  74 sector = "2048"
  75 EOF
  76 $QEMU_IO -c "open \
  77  -o driver=copy-on-read,file.driver=blkdebug,file.config=$BLKDBG_CONF,file.image.driver=qcow2 $TEST_WRAP" \
  78  -c "read -P 0 1M 128k" | _filter_qemu_io
  79
  80 # Read the areas we want copied. A zero-length read should still be a
  81 # no-op.  The next read is under 2G, but aligned so that rounding to
  82 # clusters copies more than 2G of zeroes. The final read will pick up
  83 # the non-zero data in the same cluster.  Since a 2G read may exhaust
  84 # memory on some machines (particularly 32-bit), we skip the test if
  85 # that fails due to memory pressure.
  86 $QEMU_IO \
  87     -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \
  88     -c "read 0 0" \
  89     | _filter_qemu_io
  90 output=$($QEMU_IO \
  91          -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \
  92          -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \
  93          2>&1 | _filter_qemu_io)
  94 case $output in
  95     *allocate*)
  96         _notrun "Insufficent memory to run test" ;;
  97     *) printf '%s\n' "$output" ;;
  98 esac
  99 $QEMU_IO \
 100     -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \
 101     -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \
 102     | _filter_qemu_io
 103
 104 # Copy-on-read is incompatible with read-only
 105 $QEMU_IO \
 106     -c "open -r -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \
 107     2>&1 | _filter_testdir
 108
 109 # Break the backing chain, and show that images are identical, and that
 110 # we properly copied over explicit zeros.
 111 $QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP"
 112 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
 113 _check_test_img
 114 $QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP"
 115
 116 # success, all done
 117 echo '*** done'
 118 status=0