iotests: Add test for the regression fixed in c8bf9a9169

Signed-off-by: Alberto Garcia <berto@igalia.com>
Suggested-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210112170540.2912-1-berto@igalia.com>
[mreitz: Add "# group:" line]
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2021-01-12 18:05:40 +01:00 committed by Max Reitz
parent 797e3e3805
commit 0f46147e10
3 changed files with 134 additions and 0 deletions

104
tests/qemu-iotests/313 Executable file
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#!/usr/bin/env bash
# group: rw auto quick
#
# Test for the regression fixed in commit c8bf9a9169
#
# Copyright (C) 2020 Igalia, S.L.
# Author: Alberto Garcia <berto@igalia.com>
# Based on a test case by Maxim Levitsky <mlevitsk@redhat.com>
#
# 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/>.
#
# creator
owner=berto@igalia.com
seq=`basename $0`
echo "QA output created by $seq"
status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
}
trap "_cleanup; exit \$status" 0 1 2 3 15
# get standard environment, filters and checks
. ./common.rc
. ./common.filter
_supported_fmt qcow2
_supported_proto file
_supported_os Linux
_unsupported_imgopts cluster_size refcount_bits extended_l2 compat=0.10 data_file
# The cluster size must be at least the granularity of the mirror job (4KB)
# Note that larger cluster sizes will produce very large images (several GBs)
cluster_size=4096
refcount_bits=64 # Make it equal to the L2 entry size for convenience
options="cluster_size=${cluster_size},refcount_bits=${refcount_bits}"
# Number of refcount entries per refcount blocks
ref_entries=$(( ${cluster_size} * 8 / ${refcount_bits} ))
# Number of data clusters needed to fill a refcount block
# Equals ${ref_entries} minus two (one L2 table and one refcount block)
data_clusters_per_refblock=$(( ${ref_entries} - 2 ))
# Number of entries in the refcount cache
ref_blocks=4
# Write enough data clusters to fill the refcount cache and allocate
# one more refcount block.
# Subtract 3 clusters from the total: qcow2 header, refcount table, L1 table
total_data_clusters=$(( ${data_clusters_per_refblock} * ${ref_blocks} + 1 - 3 ))
# Total size to write in bytes
total_size=$(( ${total_data_clusters} * ${cluster_size} ))
echo
echo '### Create the image'
echo
TEST_IMG_FILE=$TEST_IMG.base _make_test_img -o $options $total_size | _filter_img_create_size
echo
echo '### Write data to allocate more refcount blocks than the cache can hold'
echo
$QEMU_IO -c "write -P 1 0 $total_size" $TEST_IMG.base | _filter_qemu_io
echo
echo '### Create an overlay'
echo
_make_test_img -F $IMGFMT -b $TEST_IMG.base -o $options | _filter_img_create_size
echo
echo '### Fill the overlay with zeroes'
echo
$QEMU_IO -c "write -z 0 $total_size" $TEST_IMG | _filter_qemu_io
echo
echo '### Commit changes to the base image'
echo
$QEMU_IMG commit $TEST_IMG
echo
echo '### Check the base image'
echo
$QEMU_IMG check $TEST_IMG.base
# success, all done
echo "*** done"
rm -f $seq.full
status=0

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QA output created by 313
### Create the image
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=SIZE
### Write data to allocate more refcount blocks than the cache can hold
wrote 8347648/8347648 bytes at offset 0
7.961 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
### Create an overlay
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=SIZE backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
### Fill the overlay with zeroes
wrote 8347648/8347648 bytes at offset 0
7.961 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
### Commit changes to the base image
Image committed.
### Check the base image
No errors were found on the image.
Image end offset: 8396800
*** done

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309 rw auto quick
310 rw quick
312 rw quick
313 rw auto quick