4 # Test case for copy-on-read into qcow2, using the COR filter driver
6 # Copyright (C) 2018 Red Hat, Inc.
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.
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.
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/>.
23 echo "QA output created by $seq"
25 status=1 # failure is the default!
27 # get standard environment, filters and checks
31 TEST_WRAP="$TEST_DIR/t.wrap.qcow2"
32 BLKDBG_CONF="$TEST_DIR/blkdebug.conf"
34 # Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces
38 _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;;
44 _rm_test_img "$TEST_WRAP"
47 trap "_cleanup; exit \$status" 0 1 2 3 15
49 # Test is supported for any backing file; but we force qcow2 for our wrapper.
50 _supported_fmt generic
51 _supported_proto generic
52 # LUKS support may be possible, but it complicates things.
54 _unsupported_imgopts "subformat=streamOptimized"
57 echo '=== Copy-on-read ==='
61 # VPC rounds image sizes to a specific geometry, force a specific size.
62 if [ "$IMGFMT" = "vpc" ]; then
63 IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size")
66 $QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io
67 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
68 _make_test_img --no-opts -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create
69 $QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io
71 # Ensure that a read of two clusters, but where one is already allocated,
72 # does not re-write the allocated cluster
73 cat > "$BLKDBG_CONF" <<EOF
79 -o driver=copy-on-read,file.driver=blkdebug,file.config=$BLKDBG_CONF,file.image.driver=qcow2 $TEST_WRAP" \
80 -c "read -P 0 1M 128k" | _filter_qemu_io
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.
89 -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \
93 -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \
94 -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \
95 2>&1 | _filter_qemu_io)
98 _notrun "Insufficent memory to run test" ;;
99 *) printf '%s\n' "$output" ;;
102 -c "open -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \
103 -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \
106 # Copy-on-read is incompatible with read-only
108 -c "open -r -o driver=copy-on-read,file.driver=qcow2 $TEST_WRAP" \
109 2>&1 | _filter_testdir
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"
116 $QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP"