diff options
| -rwxr-xr-x | tests/qemu-iotests/115 | 95 | ||||
| -rw-r--r-- | tests/qemu-iotests/115.out | 8 | ||||
| -rw-r--r-- | tests/qemu-iotests/group | 1 |
3 files changed, 104 insertions, 0 deletions
diff --git a/tests/qemu-iotests/115 b/tests/qemu-iotests/115 new file mode 100755 index 0000000000..a6be1876aa --- /dev/null +++ b/tests/qemu-iotests/115 @@ -0,0 +1,95 @@ +#!/bin/bash +# +# Test case for non-self-referential qcow2 refcount blocks +# +# Copyright (C) 2014 Red Hat, Inc. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +# + +# creator +owner=mreitz@redhat.com + +seq="$(basename $0)" +echo "QA output created by $seq" + +here="$PWD" +tmp=/tmp/$$ +status=1 # failure is the default! + +_cleanup() +{ + _cleanup_test_img +} +trap "_cleanup; exit \$status" 0 1 2 3 15 + +# get standard environment, filters and checks +. ./common.rc +. ./common.filter + +_supported_fmt qcow2 +_supported_proto file +_supported_os Linux +# This test relies on refcounts being 64 bits wide (which does not work with +# compat=0.10) +_unsupported_imgopts 'refcount_bits=\([^6]\|.\([^4]\|$\)\)' 'compat=0.10' + +echo +echo '=== Testing large refcount and L1 table ===' +echo + +# Create an image with an L1 table and a refcount table that each span twice the +# number of clusters which can be described by a single refblock; therefore, at +# least two refblocks cannot count their own refcounts because all the clusters +# they describe are part of the L1 table or refcount table. + +# One refblock can describe (with cluster_size=512 and refcount_bits=64) +# 512/8 = 64 clusters, therefore the L1 table should cover 128 clusters, which +# equals 128 * (512/8) = 8192 entries (actually, 8192 - 512/8 = 8129 would +# suffice, but it does not really matter). 8192 L2 tables can in turn describe +# 8192 * 512/8 = 524,288 clusters which cover a space of 256 MB. + +# Since with refcount_bits=64 every refcount block entry is 64 bits wide (just +# like the L2 table entries), the same calculation applies to the refcount table +# as well; the difference is that while for the L1 table the guest disk size is +# concerned, for the refcount table it is the image length that has to be at +# least 256 MB. We can achieve that by using preallocation=metadata for an image +# which has a guest disk size of 256 MB. + +IMGOPTS="$IMGOPTS,refcount_bits=64,cluster_size=512,preallocation=metadata" \ + _make_test_img 256M + +# We know for sure that the L1 and refcount tables do not overlap with any other +# structure because the metadata overlap checks would have caught that case. + +# Because qemu refuses to open qcow2 files whose L1 table does not cover the +# whole guest disk size, it is definitely large enough. On the other hand, to +# test whether the refcount table is large enough, we simply have to verify that +# indeed all the clusters are allocated, which is done by qemu-img check. + +# The final thing we need to test is whether the tables are actually covered by +# refcount blocks; since all clusters of the tables are referenced, we can use +# qemu-img check for that purpose, too. + +$QEMU_IMG check "$TEST_IMG" | \ + sed -e 's/^.* = \([0-9]\+\.[0-9]\+% allocated\).*\(clusters\)$/\1 \2/' \ + -e '/^Image end offset/d' + +# (Note that we cannot use _check_test_img because that function filters out the +# allocation status) + +# success, all done +echo '*** done' +rm -f $seq.full +status=0 diff --git a/tests/qemu-iotests/115.out b/tests/qemu-iotests/115.out new file mode 100644 index 0000000000..7b2c5e02f5 --- /dev/null +++ b/tests/qemu-iotests/115.out @@ -0,0 +1,8 @@ +QA output created by 115 + +=== Testing large refcount and L1 table === + +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=268435456 preallocation='metadata' +No errors were found on the image. +100.00% allocated clusters +*** done diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group index 961c7cda33..62621278e2 100644 --- a/tests/qemu-iotests/group +++ b/tests/qemu-iotests/group @@ -119,6 +119,7 @@ 112 rw auto 113 rw auto quick 114 rw auto quick +115 rw auto 116 rw auto quick 121 rw auto 123 rw auto quick |