1#!/usr/bin/env bash 2# 3# Test case for non-self-referential qcow2 refcount blocks 4# 5# Copyright (C) 2014 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_supported_fmt qcow2 40_supported_proto file fuse 41# This test relies on refcounts being 64 bits wide (which does not work with 42# compat=0.10) 43_unsupported_imgopts 'refcount_bits=\([^6]\|.\([^4]\|$\)\)' 'compat=0.10' 44 45echo 46echo '=== Testing large refcount and L1 table ===' 47echo 48 49# Create an image with an L1 table and a refcount table that each span twice the 50# number of clusters which can be described by a single refblock; therefore, at 51# least two refblocks cannot count their own refcounts because all the clusters 52# they describe are part of the L1 table or refcount table. 53 54# One refblock can describe (with cluster_size=512 and refcount_bits=64) 55# 512/8 = 64 clusters, therefore the L1 table should cover 128 clusters, which 56# equals 128 * (512/8) = 8192 entries (actually, 8192 - 512/8 = 8129 would 57# suffice, but it does not really matter). 8192 L2 tables can in turn describe 58# 8192 * 512/8 = 524,288 clusters which cover a space of 256 MB. 59 60# Since with refcount_bits=64 every refcount block entry is 64 bits wide (just 61# like the L2 table entries), the same calculation applies to the refcount table 62# as well; the difference is that while for the L1 table the guest disk size is 63# concerned, for the refcount table it is the image length that has to be at 64# least 256 MB. We can achieve that by using preallocation=metadata for an image 65# which has a guest disk size of 256 MB. 66 67_make_test_img -o "refcount_bits=64,cluster_size=512,preallocation=metadata" 256M 68 69# We know for sure that the L1 and refcount tables do not overlap with any other 70# structure because the metadata overlap checks would have caught that case. 71 72# Because qemu refuses to open qcow2 files whose L1 table does not cover the 73# whole guest disk size, it is definitely large enough. On the other hand, to 74# test whether the refcount table is large enough, we simply have to verify that 75# indeed all the clusters are allocated, which is done by qemu-img check. 76 77# The final thing we need to test is whether the tables are actually covered by 78# refcount blocks; since all clusters of the tables are referenced, we can use 79# qemu-img check for that purpose, too. 80 81$QEMU_IMG check "$TEST_IMG" | \ 82 sed -e 's/^.* = \([0-9]\+\.[0-9]\+% allocated\).*\(clusters\)$/\1 \2/' \ 83 -e '/^Image end offset/d' 84 85# (Note that we cannot use _check_test_img because that function filters out the 86# allocation status) 87 88# success, all done 89echo '*** done' 90rm -f $seq.full 91status=0 92