xref: /openbmc/qemu/tests/qemu-iotests/197 (revision 812b31d3)
1#!/usr/bin/env bash
2# group: rw quick
3#
4# Test case for copy-on-read into qcow2
5#
6# Copyright (C) 2017 Red Hat, Inc.
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
23owner=eblake@redhat.com
24
25seq="$(basename $0)"
26echo "QA output created by $seq"
27
28status=1 # failure is the default!
29
30# get standard environment, filters and checks
31. ./common.rc
32. ./common.filter
33
34TEST_WRAP="$TEST_DIR/t.wrap.qcow2"
35BLKDBG_CONF="$TEST_DIR/blkdebug.conf"
36
37# Sanity check: our use of blkdebug fails if $TEST_DIR contains spaces
38# or other problems
39case "$TEST_DIR" in
40    *[^-_a-zA-Z0-9/]*)
41        _notrun "Suspicious TEST_DIR='$TEST_DIR', cowardly refusing to run" ;;
42esac
43
44_cleanup()
45{
46    _cleanup_test_img
47    _rm_test_img "$TEST_WRAP"
48    rm -f "$BLKDBG_CONF"
49}
50trap "_cleanup; exit \$status" 0 1 2 3 15
51
52# Test is supported for any backing file; but we force qcow2 for our wrapper.
53_supported_fmt generic
54_supported_proto generic
55# LUKS support may be possible, but it complicates things.
56_unsupported_fmt luks
57_unsupported_imgopts "subformat=streamOptimized"
58
59echo
60echo '=== Copy-on-read ==='
61echo
62
63# Prep the images
64# VPC rounds image sizes to a specific geometry, force a specific size.
65if [ "$IMGFMT" = "vpc" ]; then
66    IMGOPTS=$(_optstr_add "$IMGOPTS" "force_size")
67fi
68_make_test_img 4G
69$QEMU_IO -c "write -P 55 3G 1k" "$TEST_IMG" | _filter_qemu_io
70IMGPROTO=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" "$TEST_WRAP" | _filter_qemu_io
73
74# Ensure that a read of two clusters, but where one is already allocated,
75# does not re-write the allocated cluster
76cat > "$BLKDBG_CONF" <<EOF
77[inject-error]
78event = "cor_write"
79sector = "2048"
80EOF
81$QEMU_IO -c "open -C \
82 -o driver=blkdebug,config=$BLKDBG_CONF,image.driver=qcow2 $TEST_WRAP" \
83 -c "read -P 0 1M 128k" | _filter_qemu_io
84
85# Read the areas we want copied. A zero-length read should still be a
86# no-op.  The next read is under 2G, but aligned so that rounding to
87# clusters copies more than 2G of zeroes. The final read will pick up
88# the non-zero data in the same cluster.  Since a 2G read may exhaust
89# memory on some machines (particularly 32-bit), we skip the test if
90# that fails due to memory pressure.
91$QEMU_IO -f qcow2 -C -c "read 0 0" "$TEST_WRAP" | _filter_qemu_io
92output=$($QEMU_IO -f qcow2 -C -c "read -P 0 1k $((2*1024*1024*1024 - 512))" \
93        "$TEST_WRAP" 2>&1 | _filter_qemu_io)
94case $output in
95    *allocate*)
96        _notrun "Insufficent memory to run test" ;;
97    *) printf '%s\n' "$output" ;;
98esac
99$QEMU_IO -f qcow2 -C -c "read -P 0 $((3*1024*1024*1024 + 1024)) 1k" \
100    "$TEST_WRAP" | _filter_qemu_io
101
102# Copy-on-read is incompatible with read-only
103$QEMU_IO -f qcow2 -C -r "$TEST_WRAP" 2>&1 | _filter_testdir
104
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"
109_check_test_img
110$QEMU_IMG compare -f $IMGFMT -F qcow2 "$TEST_IMG" "$TEST_WRAP"
111
112echo
113echo '=== Partial final cluster ==='
114echo
115
116# Force compat=1.1, because writing zeroes on a v2 image without a
117# backing file would just result in an unallocated cluster
118# (Also, note that this is really a pure qcow2 test.)
119IMGPROTO=file IMGFMT=qcow2 TEST_IMG_FILE="$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"
123_check_test_img
124
125# success, all done
126echo '*** done'
127status=0
128