1#!/usr/bin/env bash 2# 3# General test case for qcow2's image check 4# 5# Copyright (C) 2015 Red Hat, Inc. 6# 7# This program is free software; you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation; either version 2 of the License, or 10# (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program. If not, see <http://www.gnu.org/licenses/>. 19# 20 21# creator 22owner=mreitz@redhat.com 23 24seq="$(basename $0)" 25echo "QA output created by $seq" 26 27status=1 # failure is the default! 28 29_cleanup() 30{ 31 _cleanup_test_img 32} 33trap "_cleanup; exit \$status" 0 1 2 3 15 34 35# get standard environment, filters and checks 36. ./common.rc 37. ./common.filter 38 39# This tests qcow2-specific low-level functionality 40_supported_fmt qcow2 41_supported_proto file 42_supported_os Linux 43# With an external data file, data clusters are not refcounted 44# (so qemu-img check would not do much); 45# we want to modify the refcounts, so we need them to have a specific 46# format (namely u16) 47_unsupported_imgopts data_file 'refcount_bits=\([^1]\|.\([^6]\|$\)\)' 48 49echo 50echo '=== Check on an image with a multiple of 2^32 clusters ===' 51echo 52 53_make_test_img -o "cluster_size=512" 512 54 55# Allocate L2 table 56$QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io 57 58# Put the data cluster at a multiple of 2 TB, resulting in the image apparently 59# having a multiple of 2^32 clusters 60# (To be more specific: It is at 32 PB) 61poke_file "$TEST_IMG" $((2048 + 8)) "\x00\x80\x00\x00\x00\x00\x00\x00" 62 63# An offset of 32 PB results in qemu-img check having to allocate an in-memory 64# refcount table of 128 TB (16 bit refcounts, 512 byte clusters), if qemu-img 65# don't check that referenced data cluster is far beyond the end of file. 66# But starting from 4.0, qemu-img does this check, and instead of "Cannot 67# allocate memory", we have an error showing that l2 entry is invalid. 68_check_test_img 69 70echo 71echo '=== Check leaks-fixed/corruptions-fixed report' 72echo 73 74# After leaks and corruptions were fixed, those numbers should be 75# reported by qemu-img check 76_make_test_img 64k 77 78# Allocate data cluster 79$QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io 80 81reftable_ofs=$(peek_file_be "$TEST_IMG" 48 8) 82refblock_ofs=$(peek_file_be "$TEST_IMG" $reftable_ofs 8) 83 84# Introduce a leak: Make the image header's refcount 2 85poke_file_be "$TEST_IMG" "$refblock_ofs" 2 2 86 87l1_ofs=$(peek_file_be "$TEST_IMG" 40 8) 88 89# Introduce a corruption: Drop the COPIED flag from the (first) L1 entry 90l1_entry=$(peek_file_be "$TEST_IMG" $l1_ofs 8) 91l1_entry=$((l1_entry & ~(1 << 63))) 92poke_file_be "$TEST_IMG" $l1_ofs 8 $l1_entry 93 94echo 95# Should print the number of corruptions and leaks fixed 96# (Filter out all JSON fields (recognizable by their four-space 97# indentation), but keep the "-fixed" fields (by removing two spaces 98# from their indentation)) 99# (Also filter out the L1 entry, because why not) 100_check_test_img -r all --output=json \ 101 | sed -e 's/^ \(.*\)-fixed"/\1-fixed"/' \ 102 -e '/^ /d' \ 103 -e "s/\\([^0-9a-f]\\)$(printf %x $l1_entry)\\([^0-9a-f]\\)/\1L1_ENTRY_VALUE\2/" 104 105# success, all done 106echo "*** done" 107rm -f $seq.full 108status=0 109