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1 #!/usr/bin/env bash 2 # group: rw 3 # 4 # Test compressed write to a qcow2 image at an offset above 4 GB 5 # 6 # Copyright (C) 2019 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 seq=$(basename "$0") 23 echo "QA output created by $seq" 24 25 status=1 # failure is the default! 26 27 _cleanup() 28 { 29 _cleanup_test_img 30 } 31 trap "_cleanup; exit \$status" 0 1 2 3 15 32 33 # get standard environment, filters and checks 34 . ./common.rc 35 . ./common.filter 36 37 # This is a qcow2 regression test 38 _supported_fmt qcow2 39 _supported_proto file fuse 40 41 # External data files do not support compression; 42 # We need an exact cluster size (2M) and refcount width (2) so we can 43 # get this test quickly over with; and this in turn require 44 # compat=1.1 45 _unsupported_imgopts data_file cluster_size refcount_bits 'compat=0.10' 46 47 # The idea is: Create an empty file, mark the first 4 GB as used, then 48 # do a compressed write that thus must be put beyond 4 GB. 49 # (This used to fail because the compressed sector mask was just a 50 # 32 bit mask, so qemu-img check will count a cluster before 4 GB as 51 # referenced twice.) 52 53 # We would like to use refcount_bits=1 here, but then qemu-img check 54 # will throw an error when trying to count a cluster as referenced 55 # twice. 56 _make_test_img -o cluster_size=2M,refcount_bits=2 64M 57 58 reft_offs=$(peek_file_be "$TEST_IMG" 48 8) 59 refb_offs=$(peek_file_be "$TEST_IMG" $reft_offs 8) 60 61 # We want to cover 4 GB, those are 2048 clusters, equivalent to 62 # 4096 bit = 512 B. 63 truncate -s 4G "$TEST_IMG" 64 for ((in_refb_offs = 0; in_refb_offs < 512; in_refb_offs += 8)); do 65 poke_file "$TEST_IMG" $((refb_offs + in_refb_offs)) \ 66 '\x55\x55\x55\x55\x55\x55\x55\x55' 67 done 68 69 $QEMU_IO -c 'write -c -P 42 0 2M' "$TEST_IMG" | _filter_qemu_io 70 71 echo 72 echo '--- Check ---' 73 74 # This should only print the leaked clusters in the first 4 GB 75 _check_test_img | grep -v '^Leaked cluster ' 76 77 # success, all done 78 echo "*** done" 79 rm -f $seq.full 80 status=0