iotests: Add test for 4G+ compressed qcow2 write

Test what qemu-img check says about an image after one has written
compressed data to an offset above 4 GB.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20191028161841.1198-3-mreitz@redhat.com
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-10-28 17:18:41 +01:00
parent 24552feb6a
commit b7cd2c11f7
3 changed files with 90 additions and 0 deletions

79
tests/qemu-iotests/272 Executable file
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#!/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 $seq"
status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
# This is a qcow2 regression test
_supported_fmt qcow2
_supported_proto file
# External data files do not support compression;
# We need an exact cluster size (2M) and refcount width (2) so we can
# get this test quickly over with; and this in turn require
# compat=1.1
_unsupported_imgopts data_file cluster_size refcount_bits 'compat=0.10'
# The idea is: Create an empty file, mark the first 4 GB as used, then
# do a compressed write that thus must be put beyond 4 GB.
# (This used to fail because the compressed sector mask was just a
# 32 bit mask, so qemu-img check will count a cluster before 4 GB as
# referenced twice.)
# We would like to use refcount_bits=1 here, but then qemu-img check
# will throw an error when trying to count a cluster as referenced
# twice.
_make_test_img -o cluster_size=2M,refcount_bits=2 64M
reft_offs=$(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

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QA output created by 272
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
wrote 2097152/2097152 bytes at offset 0
2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
--- Check ---
2044 leaked clusters were found on the image.
This means waste of disk space, but no harm to data.
*** done

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@ -283,3 +283,4 @@
267 rw auto quick snapshot 267 rw auto quick snapshot
268 rw auto quick 268 rw auto quick
270 rw backing quick 270 rw backing quick
272 rw