xref: /openbmc/qemu/tests/qemu-iotests/252 (revision ca693d1c)
1#!/usr/bin/env bash
2#
3# Tests for rebasing COW images that require zero cluster support
4#
5# Copyright (C) 2019 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
22owner=mreitz@redhat.com
23
24seq=$(basename $0)
25echo "QA output created by $seq"
26
27status=1	# failure is the default!
28
29_cleanup()
30{
31    _cleanup_test_img
32    rm -f "$TEST_IMG.base_new"
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. ./common.pattern
40
41# Currently only qcow2 and qed support rebasing, and only qcow2 v3 has
42# zero cluster support
43_supported_fmt qcow2
44_unsupported_imgopts 'compat=0.10'
45_supported_proto file
46_supported_os Linux
47
48CLUSTER_SIZE=65536
49
50echo
51echo "=== Test rebase without input base ==="
52echo
53
54# Cluster allocations to be tested:
55#
56# Backing (new) 11 -- 11 -- 11 --
57# COW image     22 22 11 11 -- --
58#
59# Expected result:
60#
61# COW image     22 22 11 11 00 --
62#
63# (Cluster 2 might be "--" after the rebase, too, but rebase just
64#  compares the new backing file to the old one and disregards the
65#  overlay.  Therefore, it will never discard overlay clusters.)
66
67_make_test_img $((6 * CLUSTER_SIZE))
68TEST_IMG="$TEST_IMG.base_new" _make_test_img $((6 * CLUSTER_SIZE))
69
70echo
71
72$QEMU_IO "$TEST_IMG" \
73    -c "write -P 0x22 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
74    -c "write -P 0x11 $((2 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
75    | _filter_qemu_io
76
77$QEMU_IO "$TEST_IMG.base_new" \
78    -c "write -P 0x11 $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
79    -c "write -P 0x11 $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
80    -c "write -P 0x11 $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
81    | _filter_qemu_io
82
83echo
84
85# This should be a no-op
86$QEMU_IMG rebase -b "" "$TEST_IMG"
87
88# Verify the data is correct
89$QEMU_IO "$TEST_IMG" \
90    -c "read -P 0x22 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
91    -c "read -P 0x11 $((2 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
92    -c "read -P 0x00 $((4 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
93    | _filter_qemu_io
94
95echo
96
97# Verify the allocation status (first four cluster should be allocated
98# in TEST_IMG, clusters 4 and 5 should be unallocated (marked as zero
99# clusters here because there is no backing file))
100$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
101
102echo
103
104$QEMU_IMG rebase -b "$TEST_IMG.base_new" "$TEST_IMG"
105
106# Verify the data is correct
107$QEMU_IO "$TEST_IMG" \
108    -c "read -P 0x22 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
109    -c "read -P 0x11 $((2 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
110    -c "read -P 0x00 $((4 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
111    | _filter_qemu_io
112
113echo
114
115# Verify the allocation status (first four cluster should be allocated
116# in TEST_IMG, cluster 4 should be zero, and cluster 5 should be
117# unallocated (signified by '"depth": 1'))
118$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
119
120
121# success, all done
122echo "*** done"
123rm -f $seq.full
124status=0
125