tests/qemu-iotests/290

   1 #!/usr/bin/env bash
   2 #
   3 # Test how 'qemu-io -c discard' behaves on v2 and v3 qcow2 images
   4 #
   5 # Copyright (C) 2020 Igalia, S.L.
   6 # Author: Alberto Garcia <berto@igalia.com>
   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=berto@igalia.com
  24
  25 seq=`basename $0`
  26 echo "QA output created by $seq"
  27
  28 status=1    # failure is the default!
  29
  30 _cleanup()
  31 {
  32     _cleanup_test_img
  33 }
  34 trap "_cleanup; exit \$status" 0 1 2 3 15
  35
  36 # get standard environment, filters and checks
  37 . ./common.rc
  38 . ./common.filter
  39
  40 _supported_fmt qcow2
  41 _supported_proto file
  42 _supported_os Linux
  43 _unsupported_imgopts 'compat=0.10' refcount_bits data_file
  44
  45 echo
  46 echo "### Test 'qemu-io -c discard' on a QCOW2 image without a backing file"
  47 echo
  48 for qcow2_compat in 0.10 1.1; do
  49     echo "# Create an image with compat=$qcow2_compat without a backing file"
  50     _make_test_img -o "compat=$qcow2_compat" 128k
  51
  52     echo "# Fill all clusters with data and then discard them"
  53     $QEMU_IO -c 'write -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io
  54     $QEMU_IO -c 'discard 0 128k' "$TEST_IMG" | _filter_qemu_io
  55
  56     echo "# Read the data from the discarded clusters"
  57     $QEMU_IO -c 'read -P 0x00 0 128k' "$TEST_IMG" | _filter_qemu_io
  58
  59     echo "# Output of qemu-img map"
  60     $QEMU_IMG map "$TEST_IMG" | _filter_testdir
  61 done
  62
  63 echo
  64 echo "### Test 'qemu-io -c discard' on a QCOW2 image with a backing file"
  65 echo
  66
  67 echo "# Create a backing image and fill it with data"
  68 BACKING_IMG="$TEST_IMG.base"
  69 TEST_IMG="$BACKING_IMG" _make_test_img 128k
  70 $QEMU_IO -c 'write -P 0xff 0 128k' "$BACKING_IMG" | _filter_qemu_io
  71
  72 for qcow2_compat in 0.10 1.1; do
  73     echo "# Create an image with compat=$qcow2_compat and a backing file"
  74     _make_test_img -o "compat=$qcow2_compat" -b "$BACKING_IMG" -F $IMGFMT
  75
  76     echo "# Fill all clusters with data and then discard them"
  77     $QEMU_IO -c 'write -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io
  78     $QEMU_IO -c 'discard 0 128k' "$TEST_IMG" | _filter_qemu_io
  79
  80     echo "# Read the data from the discarded clusters"
  81     if [ "$qcow2_compat" = "1.1" ]; then
  82         # In qcow2 v3 clusters are zeroed (with QCOW_OFLAG_ZERO)
  83         $QEMU_IO -c 'read -P 0x00 0 128k' "$TEST_IMG" | _filter_qemu_io
  84     else
  85         # In qcow2 v2 if there's a backing image we cannot zero the clusters
  86         # without exposing the backing file data so discard does nothing
  87         $QEMU_IO -c 'read -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io
  88     fi
  89
  90     echo "# Output of qemu-img map"
  91     $QEMU_IMG map "$TEST_IMG" | _filter_testdir
  92 done
  93
  94 # success, all done
  95 echo "*** done"
  96 rm -f $seq.full
  97 status=0