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93 lines
3.4 KiB
Bash
93 lines
3.4 KiB
Bash
#!/usr/bin/env bash
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# group: rw
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#
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# Test case for non-self-referential qcow2 refcount blocks
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#
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# Copyright (C) 2014 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# creator
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owner=hreitz@redhat.com
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seq="$(basename $0)"
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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_supported_fmt qcow2
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_supported_proto file fuse
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# This test relies on refcounts being 64 bits wide (which does not work with
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# compat=0.10)
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_unsupported_imgopts 'refcount_bits=\([^6]\|.\([^4]\|$\)\)' 'compat=0.10'
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echo
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echo '=== Testing large refcount and L1 table ==='
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echo
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# Create an image with an L1 table and a refcount table that each span twice the
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# number of clusters which can be described by a single refblock; therefore, at
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# least two refblocks cannot count their own refcounts because all the clusters
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# they describe are part of the L1 table or refcount table.
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# One refblock can describe (with cluster_size=512 and refcount_bits=64)
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# 512/8 = 64 clusters, therefore the L1 table should cover 128 clusters, which
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# equals 128 * (512/8) = 8192 entries (actually, 8192 - 512/8 = 8129 would
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# suffice, but it does not really matter). 8192 L2 tables can in turn describe
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# 8192 * 512/8 = 524,288 clusters which cover a space of 256 MB.
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# Since with refcount_bits=64 every refcount block entry is 64 bits wide (just
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# like the L2 table entries), the same calculation applies to the refcount table
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# as well; the difference is that while for the L1 table the guest disk size is
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# concerned, for the refcount table it is the image length that has to be at
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# least 256 MB. We can achieve that by using preallocation=metadata for an image
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# which has a guest disk size of 256 MB.
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_make_test_img -o "refcount_bits=64,cluster_size=512,preallocation=metadata" 256M
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# We know for sure that the L1 and refcount tables do not overlap with any other
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# structure because the metadata overlap checks would have caught that case.
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# Because qemu refuses to open qcow2 files whose L1 table does not cover the
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# whole guest disk size, it is definitely large enough. On the other hand, to
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# test whether the refcount table is large enough, we simply have to verify that
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# indeed all the clusters are allocated, which is done by qemu-img check.
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# The final thing we need to test is whether the tables are actually covered by
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# refcount blocks; since all clusters of the tables are referenced, we can use
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# qemu-img check for that purpose, too.
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$QEMU_IMG check "$TEST_IMG" | \
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sed -e 's/^.* = \([0-9]\+\.[0-9]\+% allocated\).*\(clusters\)$/\1 \2/' \
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-e '/^Image end offset/d'
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# (Note that we cannot use _check_test_img because that function filters out the
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# allocation status)
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# success, all done
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echo '*** done'
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rm -f $seq.full
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status=0
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