tests/qemu-iotests/290

   1 #!/usr/bin/env bash
   2 # group: rw auto quick
   3 #
   4 # Test how 'qemu-io -c discard' behaves on v2 and v3 qcow2 images
   5 #
   6 # Copyright (C) 2020 Igalia, S.L.
   7 # Author: Alberto Garcia <berto@igalia.com>
   8 #
   9 # This program is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # This program is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22
  23 # creator
  24 owner=berto@igalia.com
  25
  26 seq=`basename $0`
  27 echo "QA output created by $seq"
  28
  29 status=1    # failure is the default!
  30
  31 _cleanup()
  32 {
  33     _cleanup_test_img
  34 }
  35 trap "_cleanup; exit \$status" 0 1 2 3 15
  36
  37 # get standard environment, filters and checks
  38 . ./common.rc
  39 . ./common.filter
  40
  41 _supported_fmt qcow2
  42 _supported_proto file fuse
  43 _supported_os Linux
  44 _unsupported_imgopts 'compat=0.10' refcount_bits data_file compression_type
  45
  46 echo
  47 echo "### Test 'qemu-io -c discard' on a QCOW2 image without a backing file"
  48 echo
  49 for qcow2_compat in 0.10 1.1; do
  50     echo "# Create an image with compat=$qcow2_compat without a backing file"
  51     _make_test_img -o "compat=$qcow2_compat" 128k
  52
  53     echo "# Fill all clusters with data and then discard them"
  54     $QEMU_IO -c 'write -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io
  55     $QEMU_IO -c 'discard 0 128k' "$TEST_IMG" | _filter_qemu_io
  56
  57     echo "# Read the data from the discarded clusters"
  58     $QEMU_IO -c 'read -P 0x00 0 128k' "$TEST_IMG" | _filter_qemu_io
  59
  60     echo "# Output of qemu-img map"
  61     $QEMU_IMG map "$TEST_IMG" | _filter_testdir
  62 done
  63
  64 echo
  65 echo "### Test 'qemu-io -c discard' on a QCOW2 image with a backing file"
  66 echo
  67
  68 echo "# Create a backing image and fill it with data"
  69 BACKING_IMG="$TEST_IMG.base"
  70 TEST_IMG="$BACKING_IMG" _make_test_img 128k
  71 $QEMU_IO -c 'write -P 0xff 0 128k' "$BACKING_IMG" | _filter_qemu_io
  72
  73 for qcow2_compat in 0.10 1.1; do
  74     echo "# Create an image with compat=$qcow2_compat and a backing file"
  75     _make_test_img -o "compat=$qcow2_compat" -b "$BACKING_IMG" -F $IMGFMT
  76
  77     echo "# Fill all clusters with data and then discard them"
  78     $QEMU_IO -c 'write -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io
  79     $QEMU_IO -c 'discard 0 128k' "$TEST_IMG" | _filter_qemu_io
  80
  81     echo "# Read the data from the discarded clusters"
  82     if [ "$qcow2_compat" = "1.1" ]; then
  83         # In qcow2 v3 clusters are zeroed (with QCOW_OFLAG_ZERO)
  84         $QEMU_IO -c 'read -P 0x00 0 128k' "$TEST_IMG" | _filter_qemu_io
  85     else
  86         # In qcow2 v2 if there's a backing image we cannot zero the clusters
  87         # without exposing the backing file data so discard does nothing
  88         $QEMU_IO -c 'read -P 0x01 0 128k' "$TEST_IMG" | _filter_qemu_io
  89     fi
  90
  91     echo "# Output of qemu-img map"
  92     $QEMU_IMG map "$TEST_IMG" | _filter_testdir
  93 done
  94
  95 # success, all done
  96 echo "*** done"
  97 rm -f $seq.full
  98 status=0