4 # General test case for qcow2's image check
6 # Copyright (C) 2015 Red Hat, Inc.
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.
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.
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/>.
23 owner=hreitz@redhat.com
26 echo "QA output created by $seq"
28 status=1 # failure is the default!
34 trap "_cleanup; exit \$status" 0 1 2 3 15
36 # get standard environment, filters and checks
40 # This tests qcow2-specific low-level functionality
42 _supported_proto file fuse
44 # With an external data file, data clusters are not refcounted
45 # (so qemu-img check would not do much);
46 # we want to modify the refcounts, so we need them to have a specific
48 _unsupported_imgopts data_file 'refcount_bits=\([^1]\|.\([^6]\|$\)\)'
51 echo '=== Check on an image with a multiple of 2^32 clusters ==='
54 _make_test_img -o "cluster_size=512" 512
57 $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
59 # Put the data cluster at a multiple of 2 TB, resulting in the image apparently
60 # having a multiple of 2^32 clusters
61 # (To be more specific: It is at 32 PB)
62 poke_file "$TEST_IMG" $((2048 + 8)) "\x00\x80\x00\x00\x00\x00\x00\x00"
64 # An offset of 32 PB results in qemu-img check having to allocate an in-memory
65 # refcount table of 128 TB (16 bit refcounts, 512 byte clusters), if qemu-img
66 # don't check that referenced data cluster is far beyond the end of file.
67 # But starting from 4.0, qemu-img does this check, and instead of "Cannot
68 # allocate memory", we have an error showing that l2 entry is invalid.
72 echo '=== Check leaks-fixed/corruptions-fixed report'
75 # After leaks and corruptions were fixed, those numbers should be
76 # reported by qemu-img check
79 # Allocate data cluster
80 $QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io
82 reftable_ofs=$(peek_file_be "$TEST_IMG" 48 8)
83 refblock_ofs=$(peek_file_be "$TEST_IMG" $reftable_ofs 8)
85 # Introduce a leak: Make the image header's refcount 2
86 poke_file_be "$TEST_IMG" "$refblock_ofs" 2 2
88 l1_ofs=$(peek_file_be "$TEST_IMG" 40 8)
90 # Introduce a corruption: Drop the COPIED flag from the (first) L1 entry
91 l1_entry=$(peek_file_be "$TEST_IMG" $l1_ofs 8)
92 l1_entry=$((l1_entry & ~(1 << 63)))
93 poke_file_be "$TEST_IMG" $l1_ofs 8 $l1_entry
96 # Should print the number of corruptions and leaks fixed
97 # (Filter out all JSON fields (recognizable by their four-space
98 # indentation), but keep the "-fixed" fields (by removing two spaces
99 # from their indentation))
100 # (Also filter out the L1 entry, because why not)
101 _check_test_img -r all --output=json \
102 | sed -e 's/^ \(.*\)-fixed"/\1-fixed"/' \
104 -e "s/\\([^0-9a-f]\\)$(printf %x $l1_entry)\\([^0-9a-f]\\)/\1L1_ENTRY_VALUE\2/"