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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 23 owner=hreitz@redhat.com 24 25 seq="$(basename $0)" 26 echo "QA output created by $seq" 27 28 status=1 # failure is the default! 29 30 _cleanup() 31 { 32 _cleanup_test_img 33 } 34 trap "_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 46 echo 47 echo '=== Testing large refcount and L1 table ===' 48 echo 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 90 echo '*** done' 91 rm -f $seq.full 92 status=0