1#!/usr/bin/env bash 2# group: rw 3# 4# Test case for non-self-referential qcow2 refcount blocks 5# 6# Copyright (C) 2014 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# creator 23owner=hreitz@redhat.com 24 25seq="$(basename $0)" 26echo "QA output created by $seq" 27 28status=1 # failure is the default! 29 30_cleanup() 31{ 32 _cleanup_test_img 33} 34trap "_cleanup; exit \$status" 0 1 2 3 15 35 36# get standard environment, filters and checks 37. ./common.rc 38. ./common.filter 39 40_supported_fmt qcow2 41_supported_proto file fuse 42# This test relies on refcounts being 64 bits wide (which does not work with 43# compat=0.10) 44_unsupported_imgopts 'refcount_bits=\([^6]\|.\([^4]\|$\)\)' 'compat=0.10' 45 46echo 47echo '=== Testing large refcount and L1 table ===' 48echo 49 50# Create an image with an L1 table and a refcount table that each span twice the 51# number of clusters which can be described by a single refblock; therefore, at 52# least two refblocks cannot count their own refcounts because all the clusters 53# they describe are part of the L1 table or refcount table. 54 55# One refblock can describe (with cluster_size=512 and refcount_bits=64) 56# 512/8 = 64 clusters, therefore the L1 table should cover 128 clusters, which 57# equals 128 * (512/8) = 8192 entries (actually, 8192 - 512/8 = 8129 would 58# suffice, but it does not really matter). 8192 L2 tables can in turn describe 59# 8192 * 512/8 = 524,288 clusters which cover a space of 256 MB. 60 61# Since with refcount_bits=64 every refcount block entry is 64 bits wide (just 62# like the L2 table entries), the same calculation applies to the refcount table 63# as well; the difference is that while for the L1 table the guest disk size is 64# concerned, for the refcount table it is the image length that has to be at 65# least 256 MB. We can achieve that by using preallocation=metadata for an image 66# which has a guest disk size of 256 MB. 67 68_make_test_img -o "refcount_bits=64,cluster_size=512,preallocation=metadata" 256M 69 70# We know for sure that the L1 and refcount tables do not overlap with any other 71# structure because the metadata overlap checks would have caught that case. 72 73# Because qemu refuses to open qcow2 files whose L1 table does not cover the 74# whole guest disk size, it is definitely large enough. On the other hand, to 75# test whether the refcount table is large enough, we simply have to verify that 76# indeed all the clusters are allocated, which is done by qemu-img check. 77 78# The final thing we need to test is whether the tables are actually covered by 79# refcount blocks; since all clusters of the tables are referenced, we can use 80# qemu-img check for that purpose, too. 81 82$QEMU_IMG check "$TEST_IMG" | \ 83 sed -e 's/^.* = \([0-9]\+\.[0-9]\+% allocated\).*\(clusters\)$/\1 \2/' \ 84 -e '/^Image end offset/d' 85 86# (Note that we cannot use _check_test_img because that function filters out the 87# allocation status) 88 89# success, all done 90echo '*** done' 91rm -f $seq.full 92status=0 93