xref: /openbmc/qemu/tests/qemu-iotests/138 (revision 812b31d3)
1#!/usr/bin/env bash
2# group: rw auto quick
3#
4# General test case for qcow2's image check
5#
6# Copyright (C) 2015 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
23owner=mreitz@redhat.com
24
25seq="$(basename $0)"
26echo "QA output created by $seq"
27
28status=1	# failure is the default!
29
30_cleanup()
31{
32	_cleanup_test_img
33}
34trap "_cleanup; exit \$status" 0 1 2 3 15
35
36# get standard environment, filters and checks
37. ./common.rc
38. ./common.filter
39
40# This tests qcow2-specific low-level functionality
41_supported_fmt qcow2
42_supported_proto file fuse
43_supported_os Linux
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
47# format (namely u16)
48_unsupported_imgopts data_file 'refcount_bits=\([^1]\|.\([^6]\|$\)\)'
49
50echo
51echo '=== Check on an image with a multiple of 2^32 clusters ==='
52echo
53
54_make_test_img -o "cluster_size=512" 512
55
56# Allocate L2 table
57$QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io
58
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)
62poke_file "$TEST_IMG" $((2048 + 8)) "\x00\x80\x00\x00\x00\x00\x00\x00"
63
64# An offset of 32 PB results in qemu-img check having to allocate an in-memory
65# refcount table of 128 TB (16 bit refcounts, 512 byte clusters), if qemu-img
66# don't check that referenced data cluster is far beyond the end of file.
67# But starting from 4.0, qemu-img does this check, and instead of "Cannot
68# allocate memory", we have an error showing that l2 entry is invalid.
69_check_test_img
70
71echo
72echo '=== Check leaks-fixed/corruptions-fixed report'
73echo
74
75# After leaks and corruptions were fixed, those numbers should be
76# reported by qemu-img check
77_make_test_img 64k
78
79# Allocate data cluster
80$QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io
81
82reftable_ofs=$(peek_file_be "$TEST_IMG" 48 8)
83refblock_ofs=$(peek_file_be "$TEST_IMG" $reftable_ofs 8)
84
85# Introduce a leak: Make the image header's refcount 2
86poke_file_be "$TEST_IMG" "$refblock_ofs" 2 2
87
88l1_ofs=$(peek_file_be "$TEST_IMG" 40 8)
89
90# Introduce a corruption: Drop the COPIED flag from the (first) L1 entry
91l1_entry=$(peek_file_be "$TEST_IMG" $l1_ofs 8)
92l1_entry=$((l1_entry & ~(1 << 63)))
93poke_file_be "$TEST_IMG" $l1_ofs 8 $l1_entry
94
95echo
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"/' \
103          -e '/^    /d' \
104          -e "s/\\([^0-9a-f]\\)$(printf %x $l1_entry)\\([^0-9a-f]\\)/\1L1_ENTRY_VALUE\2/"
105
106# success, all done
107echo "*** done"
108rm -f $seq.full
109status=0
110