3 # Test case for copy-on-read into qcow2
5 # Copyright (C) 2017 Red Hat, Inc.
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.
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.
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/>.
22 owner
=eblake@redhat.com
25 echo "QA output created by $seq"
27 status
=1 # failure is the default!
29 # get standard environment, filters and checks
33 TEST_WRAP
="$TEST_DIR/t.wrap.qcow2"
34 BLKDBG_CONF
="$TEST_DIR/blkdebug.conf"
36 # Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces
40 _notrun
"Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;;
46 _rm_test_img
"$TEST_WRAP"
49 trap "_cleanup; exit \$status" 0 1 2 3 15
51 # Test is supported for any backing file; but we force qcow2 for our wrapper.
52 _supported_fmt generic
53 _supported_proto generic
54 # LUKS support may be possible, but it complicates things.
56 _unsupported_imgopts
"subformat=streamOptimized"
59 echo '=== Copy-on-read ==='
63 # VPC rounds image sizes to a specific geometry, force a specific size.
64 if [ "$IMGFMT" = "vpc" ]; then
65 IMGOPTS
=$
(_optstr_add
"$IMGOPTS" "force_size")
68 $QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io
69 IMGPROTO
=file IMGFMT
=qcow2 TEST_IMG_FILE
="$TEST_WRAP" \
70 _make_test_img
--no-opts -F "$IMGFMT" -b "$TEST_IMG" | _filter_img_create
71 $QEMU_IO -f qcow2
-c "write -z -u 1M 64k" "$TEST_WRAP" | _filter_qemu_io
73 # Ensure that a read of two clusters, but where one is already allocated,
74 # does not re-write the allocated cluster
75 cat > "$BLKDBG_CONF" <<EOF
80 $QEMU_IO -c "open -C \
81 -o driver=blkdebug,config=$BLKDBG_CONF,image.driver=qcow2 $TEST_WRAP" \
82 -c "read -P 0 1M 128k" | _filter_qemu_io
84 # Read the areas we want copied. A zero-length read should still be a
85 # no-op. The next read is under 2G, but aligned so that rounding to
86 # clusters copies more than 2G of zeroes. The final read will pick up
87 # the non-zero data in the same cluster. Since a 2G read may exhaust
88 # memory on some machines (particularly 32-bit), we skip the test if
89 # that fails due to memory pressure.
90 $QEMU_IO -f qcow2
-C -c "read 0 0" "$TEST_WRAP" | _filter_qemu_io
91 output
=$
($QEMU_IO -f qcow2
-C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \
92 "$TEST_WRAP" 2>&1 | _filter_qemu_io
)
95 _notrun
"Insufficent memory to run test" ;;
96 *) printf '%s\n' "$output" ;;
98 $QEMU_IO -f qcow2
-C -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \
99 "$TEST_WRAP" | _filter_qemu_io
101 # Copy-on-read is incompatible with read-only
102 $QEMU_IO -f qcow2
-C -r "$TEST_WRAP" 2>&1 | _filter_testdir
104 # Break the backing chain, and show that images are identical, and that
105 # we properly copied over explicit zeros.
106 $QEMU_IMG rebase
-u -b "" -f qcow2
"$TEST_WRAP"
107 $QEMU_IO -f qcow2
-c map
"$TEST_WRAP"
109 $QEMU_IMG compare
-f $IMGFMT -F qcow2
"$TEST_IMG" "$TEST_WRAP"
112 echo '=== Partial final cluster ==='
116 $QEMU_IO -f $IMGFMT -C -c 'read 0 1024' "$TEST_IMG" | _filter_qemu_io
117 $QEMU_IO -f $IMGFMT -c map
"$TEST_IMG"