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1 #!/usr/bin/env bash 2 # group: rw auto quick 3 # 4 # Test for the regression fixed in commit c8bf9a9169 5 # 6 # Copyright (C) 2020 Igalia, S.L. 7 # Author: Alberto Garcia <berto@igalia.com> 8 # Based on a test case by Maxim Levitsky <mlevitsk@redhat.com> 9 # 10 # This program is free software; you can redistribute it and/or modify 11 # it under the terms of the GNU General Public License as published by 12 # the Free Software Foundation; either version 2 of the License, or 13 # (at your option) any later version. 14 # 15 # This program is distributed in the hope that it will be useful, 16 # but WITHOUT ANY WARRANTY; without even the implied warranty of 17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 # GNU General Public License for more details. 19 # 20 # You should have received a copy of the GNU General Public License 21 # along with this program. If not, see <http://www.gnu.org/licenses/>. 22 # 23 24 # creator 25 owner=berto@igalia.com 26 27 seq=`basename $0` 28 echo "QA output created by $seq" 29 30 status=1 # failure is the default! 31 32 _cleanup() 33 { 34 _cleanup_test_img 35 } 36 trap "_cleanup; exit \$status" 0 1 2 3 15 37 38 # get standard environment, filters and checks 39 . ./common.rc 40 . ./common.filter 41 42 _supported_fmt qcow2 43 _supported_proto file 44 _supported_os Linux 45 _unsupported_imgopts cluster_size refcount_bits extended_l2 compat=0.10 data_file 46 47 # The cluster size must be at least the granularity of the mirror job (4KB) 48 # Note that larger cluster sizes will produce very large images (several GBs) 49 cluster_size=4096 50 refcount_bits=64 # Make it equal to the L2 entry size for convenience 51 options="cluster_size=${cluster_size},refcount_bits=${refcount_bits}" 52 53 # Number of refcount entries per refcount blocks 54 ref_entries=$(( ${cluster_size} * 8 / ${refcount_bits} )) 55 56 # Number of data clusters needed to fill a refcount block 57 # Equals ${ref_entries} minus two (one L2 table and one refcount block) 58 data_clusters_per_refblock=$(( ${ref_entries} - 2 )) 59 60 # Number of entries in the refcount cache 61 ref_blocks=4 62 63 # Write enough data clusters to fill the refcount cache and allocate 64 # one more refcount block. 65 # Subtract 3 clusters from the total: qcow2 header, refcount table, L1 table 66 total_data_clusters=$(( ${data_clusters_per_refblock} * ${ref_blocks} + 1 - 3 )) 67 68 # Total size to write in bytes 69 total_size=$(( ${total_data_clusters} * ${cluster_size} )) 70 71 echo 72 echo '### Create the image' 73 echo 74 TEST_IMG_FILE=$TEST_IMG.base _make_test_img -o $options $total_size | _filter_img_create_size 75 76 echo 77 echo '### Write data to allocate more refcount blocks than the cache can hold' 78 echo 79 $QEMU_IO -c "write -P 1 0 $total_size" $TEST_IMG.base | _filter_qemu_io 80 81 echo 82 echo '### Create an overlay' 83 echo 84 _make_test_img -F $IMGFMT -b $TEST_IMG.base -o $options | _filter_img_create_size 85 86 echo 87 echo '### Fill the overlay with zeroes' 88 echo 89 $QEMU_IO -c "write -z 0 $total_size" $TEST_IMG | _filter_qemu_io 90 91 echo 92 echo '### Commit changes to the base image' 93 echo 94 $QEMU_IMG commit $TEST_IMG 95 96 echo 97 echo '### Check the base image' 98 echo 99 $QEMU_IMG check $TEST_IMG.base 100 101 # success, all done 102 echo "*** done" 103 rm -f $seq.full 104 status=0