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11a82d14 | 1 | #!/usr/bin/env bash |
4b4d7b07 HR |
2 | # |
3 | # Test case for non-self-referential qcow2 refcount blocks | |
4 | # | |
5 | # Copyright (C) 2014 Red Hat, Inc. | |
6 | # | |
7 | # This program is free software; you can redistribute it and/or modify | |
8 | # it under the terms of the GNU General Public License as published by | |
9 | # the Free Software Foundation; either version 2 of the License, or | |
10 | # (at your option) any later version. | |
11 | # | |
12 | # This program is distributed in the hope that it will be useful, | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | # GNU General Public License for more details. | |
16 | # | |
17 | # You should have received a copy of the GNU General Public License | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | # | |
20 | ||
21 | # creator | |
22 | owner=mreitz@redhat.com | |
23 | ||
24 | seq="$(basename $0)" | |
25 | echo "QA output created by $seq" | |
26 | ||
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27 | status=1 # failure is the default! |
28 | ||
29 | _cleanup() | |
30 | { | |
31 | _cleanup_test_img | |
32 | } | |
33 | trap "_cleanup; exit \$status" 0 1 2 3 15 | |
34 | ||
35 | # get standard environment, filters and checks | |
36 | . ./common.rc | |
37 | . ./common.filter | |
38 | ||
39 | _supported_fmt qcow2 | |
40 | _supported_proto file | |
4b4d7b07 HR |
41 | # This test relies on refcounts being 64 bits wide (which does not work with |
42 | # compat=0.10) | |
43 | _unsupported_imgopts 'refcount_bits=\([^6]\|.\([^4]\|$\)\)' 'compat=0.10' | |
44 | ||
45 | echo | |
46 | echo '=== Testing large refcount and L1 table ===' | |
47 | echo | |
48 | ||
49 | # Create an image with an L1 table and a refcount table that each span twice the | |
50 | # number of clusters which can be described by a single refblock; therefore, at | |
51 | # least two refblocks cannot count their own refcounts because all the clusters | |
52 | # they describe are part of the L1 table or refcount table. | |
53 | ||
54 | # One refblock can describe (with cluster_size=512 and refcount_bits=64) | |
55 | # 512/8 = 64 clusters, therefore the L1 table should cover 128 clusters, which | |
56 | # equals 128 * (512/8) = 8192 entries (actually, 8192 - 512/8 = 8129 would | |
57 | # suffice, but it does not really matter). 8192 L2 tables can in turn describe | |
58 | # 8192 * 512/8 = 524,288 clusters which cover a space of 256 MB. | |
59 | ||
60 | # Since with refcount_bits=64 every refcount block entry is 64 bits wide (just | |
61 | # like the L2 table entries), the same calculation applies to the refcount table | |
62 | # as well; the difference is that while for the L1 table the guest disk size is | |
63 | # concerned, for the refcount table it is the image length that has to be at | |
64 | # least 256 MB. We can achieve that by using preallocation=metadata for an image | |
65 | # which has a guest disk size of 256 MB. | |
66 | ||
67 | IMGOPTS="$IMGOPTS,refcount_bits=64,cluster_size=512,preallocation=metadata" \ | |
68 | _make_test_img 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 |