tests/qemu-iotests/215

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