| #!/usr/bin/env bash |
| # |
| # Test compressed write to a qcow2 image at an offset above 4 GB |
| # |
| # Copyright (C) 2019 Red Hat, Inc. |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 2 of the License, or |
| # (at your option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| # |
| |
| seq=$(basename "$0") |
| echo "QA output created by $seq" |
| |
| status=1 # failure is the default! |
| |
| _cleanup() |
| { |
| _cleanup_test_img |
| } |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| # get standard environment, filters and checks |
| . ./common.rc |
| . ./common.filter |
| |
| # This is a qcow2 regression test |
| _supported_fmt qcow2 |
| _supported_proto file fuse |
| |
| # External data files do not support compression; |
| # We need an exact cluster size (2M) and refcount width (2) so we can |
| # get this test quickly over with; and this in turn require |
| # compat=1.1 |
| _unsupported_imgopts data_file cluster_size refcount_bits 'compat=0.10' |
| |
| # The idea is: Create an empty file, mark the first 4 GB as used, then |
| # do a compressed write that thus must be put beyond 4 GB. |
| # (This used to fail because the compressed sector mask was just a |
| # 32 bit mask, so qemu-img check will count a cluster before 4 GB as |
| # referenced twice.) |
| |
| # We would like to use refcount_bits=1 here, but then qemu-img check |
| # will throw an error when trying to count a cluster as referenced |
| # twice. |
| _make_test_img -o cluster_size=2M,refcount_bits=2 64M |
| |
| reft_offs=$(peek_file_be "$TEST_IMG" 48 8) |
| refb_offs=$(peek_file_be "$TEST_IMG" $reft_offs 8) |
| |
| # We want to cover 4 GB, those are 2048 clusters, equivalent to |
| # 4096 bit = 512 B. |
| truncate -s 4G "$TEST_IMG" |
| for ((in_refb_offs = 0; in_refb_offs < 512; in_refb_offs += 8)); do |
| poke_file "$TEST_IMG" $((refb_offs + in_refb_offs)) \ |
| '\x55\x55\x55\x55\x55\x55\x55\x55' |
| done |
| |
| $QEMU_IO -c 'write -c -P 42 0 2M' "$TEST_IMG" | _filter_qemu_io |
| |
| echo |
| echo '--- Check ---' |
| |
| # This should only print the leaked clusters in the first 4 GB |
| _check_test_img | grep -v '^Leaked cluster ' |
| |
| # success, all done |
| echo "*** done" |
| rm -f $seq.full |
| status=0 |
