| 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 |