4 # Test case for copy-on-read into qcow2
6 # Copyright (C) 2017 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 owner=eblake@redhat.com
26 echo "QA output created by $seq"
28 status=1 # failure is the default!
30 # get standard environment, filters and checks
34 TEST_WRAP="$TEST_DIR/t.wrap.qcow2"
35 BLKDBG_CONF="$TEST_DIR/blkdebug.conf"
37 # Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces
41 _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;;
47 _rm_test_img "$TEST_WRAP"
50 trap "_cleanup; exit \$status" 0 1 2 3 15
52 # Test is supported for any backing file; but we force qcow2 for our wrapper.
53 _supported_fmt generic
54 _supported_proto generic
55 # LUKS support may be possible, but it complicates things.
57 _unsupported_imgopts "subformat=streamOptimized"
60 echo '=== Copy-on-read ==='
64 # VPC rounds image sizes to a specific geometry, force a specific size.
65 if [ "$IMGFMT" = "vpc" ]; then
66 IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size")
69 $QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io
70 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
71 _make_test_img --no-opts -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create
72 $QEMU_IO -f qcow2 -c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io
74 # Ensure that a read of two clusters, but where one is already allocated,
75 # does not re-write the allocated cluster
76 cat > "$BLKDBG_CONF" <<EOF
81 $QEMU_IO -c "open -C \
82 -o driver=blkdebug,config=$BLKDBG_CONF,image.driver=qcow2 $TEST_WRAP" \
83 -c "read -P 0 1M 128k" | _filter_qemu_io
85 # Read the areas we want copied. A zero-length read should still be a
86 # no-op. The next read is under 2G, but aligned so that rounding to
87 # clusters copies more than 2G of zeroes. The final read will pick up
88 # the non-zero data in the same cluster. Since a 2G read may exhaust
89 # memory on some machines (particularly 32-bit), we skip the test if
90 # that fails due to memory pressure.
91 $QEMU_IO -f qcow2 -C -c "read 0 0" "$TEST_WRAP" | _filter_qemu_io
92 output=$($QEMU_IO -f qcow2 -C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \
93 "$TEST_WRAP" 2>&1 | _filter_qemu_io)
96 _notrun "Insufficient memory to run test" ;;
97 *) printf '%s\n' "$output" ;;
99 $QEMU_IO -f qcow2 -C -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \
100 "$TEST_WRAP" | _filter_qemu_io
102 # Copy-on-read is incompatible with read-only
103 $QEMU_IO -f qcow2 -C -r "$TEST_WRAP" 2>&1 | _filter_testdir
105 # Break the backing chain, and show that images are identical, and that
106 # we properly copied over explicit zeros.
107 $QEMU_IMG rebase -u -b "" -f qcow2 "$TEST_WRAP"
108 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
110 $QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP"
113 echo '=== Partial final cluster ==='
116 # Force compat=1.1, because writing zeroes on a v2 image without a
117 # backing file would just result in an unallocated cluster
118 # (Also, note that this is really a pure qcow2 test.)
119 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
120 _make_test_img --no-opts -o compat=1.1 1024
121 $QEMU_IO -f qcow2 -C -c 'read 0 1024' "$TEST_WRAP" | _filter_qemu_io
122 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
126 echo '=== Copy-on-read with subclusters ==='
129 # Create base and top images 64K (1 cluster) each. Make subclusters enabled
132 IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$TEST_WRAP" \
133 _make_test_img --no-opts -o extended_l2=true -F "$IMGFMT" -b "$TEST_IMG" \
134 64K | _filter_img_create
136 $QEMU_IO -c "write -P 0xaa 0 64k" "$TEST_IMG" | _filter_qemu_io
138 # Allocate individual subclusters in the top image, and not the whole cluster
139 $QEMU_IO -f qcow2 -c "write -P 0xbb 28K 2K" -c "write -P 0xcc 34K 2K" "$TEST_WRAP" \
142 # Only 2 subclusters should be allocated in the top image at this point
143 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"
145 # Actual copy-on-read operation
146 $QEMU_IO -f qcow2 -C -c "read -P 0xaa 30K 4K" "$TEST_WRAP" | _filter_qemu_io
148 # And here we should have 4 subclusters allocated right in the middle of the
149 # top image. Make sure the whole cluster remains unallocated
150 $QEMU_IO -f qcow2 -c map "$TEST_WRAP"