xref: /openbmc/qemu/tests/qemu-iotests/024 (revision 2e1cacfb)
1#!/usr/bin/env bash
2# group: rw backing auto quick
3#
4# Rebasing COW images
5#
6# Copyright (C) 2009 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=kwolf@redhat.com
24
25seq=`basename $0`
26echo "QA output created by $seq"
27
28status=1	# failure is the default!
29
30_cleanup()
31{
32    _cleanup_test_img
33    _rm_test_img "$TEST_DIR/t.$IMGFMT.base_old"
34    _rm_test_img "$TEST_DIR/t.$IMGFMT.base_new"
35
36    _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT"
37    _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base_old"
38    _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base_new"
39    rmdir "$TEST_DIR/subdir" 2> /dev/null
40}
41trap "_cleanup; exit \$status" 0 1 2 3 15
42
43# get standard environment, filters and checks
44. ./common.rc
45. ./common.filter
46. ./common.pattern
47
48# Currently only qcow2 and qed support rebasing
49_supported_fmt qcow2 qed
50_supported_proto file
51_supported_os Linux
52
53CLUSTER_SIZE=65536
54
55# Cluster allocations to be tested:
56#
57# Backing (old) 11  --  11  --  11  --  11  --
58# Backing (new) 22  22  --  --  22  22  --  --
59# COW image     33  33  33  33  --  --  --  --
60#
61# The pattern is written twice to have both an alloc -> non-alloc and a
62# non-alloc -> alloc transition in the COW image.
63
64echo "Creating backing file"
65echo
66
67TEST_IMG_SAVE="$TEST_IMG"
68TEST_IMG="$TEST_IMG.base_old"
69
70_make_test_img 1G
71io_pattern writev 0 $CLUSTER_SIZE $((2 * CLUSTER_SIZE)) 8 0x11
72
73TEST_IMG="$TEST_IMG_SAVE.base_new"
74
75echo "Creating new backing file"
76echo
77
78_make_test_img 1G
79io_pattern writev 0 $((2 * CLUSTER_SIZE)) $((4 * CLUSTER_SIZE)) 4 0x22
80
81
82TEST_IMG="$TEST_IMG_SAVE"
83
84echo "Creating COW image"
85echo
86
87_make_test_img -b "$TEST_IMG.base_old" -F $IMGFMT 1G
88io_pattern writev 0 $((4 * CLUSTER_SIZE)) 0 1 0x33
89io_pattern writev $((8 * CLUSTER_SIZE)) $((4 * CLUSTER_SIZE)) 0 1 0x33
90
91echo "Read before the rebase to make sure everything is set up correctly"
92echo
93io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
94io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
95io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
96io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
97io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
98io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
99io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
100io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
101io_pattern readv $((8 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
102io_pattern readv $((9 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
103io_pattern readv $((10 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
104io_pattern readv $((11 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
105io_pattern readv $((12 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
106io_pattern readv $((13 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
107io_pattern readv $((14 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
108io_pattern readv $((15 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
109
110echo
111echo Rebase and test again
112echo
113$QEMU_IMG rebase -b "$TEST_IMG.base_new" -F $IMGFMT "$TEST_IMG"
114io_pattern readv $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
115io_pattern readv $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
116io_pattern readv $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
117io_pattern readv $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
118io_pattern readv $((4 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
119io_pattern readv $((5 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
120io_pattern readv $((6 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
121io_pattern readv $((7 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
122io_pattern readv $((8 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
123io_pattern readv $((9 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
124io_pattern readv $((10 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
125io_pattern readv $((11 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x33
126io_pattern readv $((12 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
127io_pattern readv $((13 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
128io_pattern readv $((14 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x11
129io_pattern readv $((15 * CLUSTER_SIZE)) $CLUSTER_SIZE 0 1 0x00
130
131echo
132echo "=== Test rebase in a subdirectory of the working directory ==="
133echo
134
135# Clean up the old images beforehand so they do not interfere with
136# this test
137_cleanup
138
139mkdir "$TEST_DIR/subdir"
140
141# Relative to the overlay
142BASE_OLD_OREL="t.$IMGFMT.base_old"
143BASE_NEW_OREL="t.$IMGFMT.base_new"
144
145# Relative to $TEST_DIR (which is going to be our working directory)
146OVERLAY_WREL="subdir/t.$IMGFMT"
147
148BASE_OLD="$TEST_DIR/subdir/$BASE_OLD_OREL"
149BASE_NEW="$TEST_DIR/subdir/$BASE_NEW_OREL"
150OVERLAY="$TEST_DIR/$OVERLAY_WREL"
151
152# Test done here:
153#
154# Backing (old): 11 11 -- 11
155# Backing (new): -- 22 22 11
156# Overlay:       -- -- -- --
157#
158# Rebasing works, we have verified that above.  Here, we just want to
159# see that rebasing is done for the correct target backing file.
160
161TEST_IMG=$BASE_OLD _make_test_img 1M
162TEST_IMG=$BASE_NEW _make_test_img 1M
163TEST_IMG=$OVERLAY _make_test_img -b "$BASE_OLD_OREL" -F $IMGFMT 1M
164
165echo
166
167$QEMU_IO "$BASE_OLD" \
168    -c "write -P 0x11 $((0 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
169    -c "write -P 0x11 $((3 * CLUSTER_SIZE)) $((1 * CLUSTER_SIZE))" \
170    | _filter_qemu_io
171
172$QEMU_IO "$BASE_NEW" \
173    -c "write -P 0x22 $((1 * CLUSTER_SIZE)) $((2 * CLUSTER_SIZE))" \
174    -c "write -P 0x11 $((3 * CLUSTER_SIZE)) $((1 * CLUSTER_SIZE))" \
175    | _filter_qemu_io
176
177echo
178
179pushd "$TEST_DIR" >/dev/null
180$QEMU_IMG rebase -f "$IMGFMT" -b "$BASE_NEW_OREL" -F $IMGFMT "$OVERLAY_WREL"
181popd >/dev/null
182
183# Verify the backing path is correct
184TEST_IMG=$OVERLAY _img_info | grep '^backing file:'
185
186echo
187
188# Verify the data is correct
189$QEMU_IO "$OVERLAY" \
190    -c "read -P 0x11 $((0 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
191    -c "read -P 0x11 $((1 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
192    -c "read -P 0x00 $((2 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
193    -c "read -P 0x11 $((3 * CLUSTER_SIZE)) $CLUSTER_SIZE" \
194    | _filter_qemu_io
195
196echo
197
198# Verify that cluster #3 is not allocated (because it is the same in
199# $BASE_OLD and $BASE_NEW)
200$QEMU_IMG map "$OVERLAY" | _filter_qemu_img_map
201
202# Check that rebase within the chain is working when
203# overlay_size > old_backing_size
204#
205# base_new <-- base_old <-- overlay
206#
207# Backing (new): 11 11 11 11 11
208# Backing (old): 22 22 22 22
209# Overlay:       -- -- -- -- --
210#
211# As a result, overlay should contain data identical to base_old, with the
212# last cluster remaining unallocated.
213
214echo
215echo "=== Test rebase within one backing chain ==="
216echo
217
218echo "Creating backing chain"
219echo
220
221TEST_IMG=$BASE_NEW _make_test_img $(( CLUSTER_SIZE * 5 ))
222TEST_IMG=$BASE_OLD _make_test_img -b "$BASE_NEW" -F $IMGFMT \
223    $(( CLUSTER_SIZE * 4 ))
224TEST_IMG=$OVERLAY _make_test_img -b "$BASE_OLD" -F $IMGFMT \
225    $(( CLUSTER_SIZE * 5 ))
226
227echo
228echo "Fill backing files with data"
229echo
230
231$QEMU_IO "$BASE_NEW" -c "write -P 0x11 0 $(( CLUSTER_SIZE * 5 ))" \
232    | _filter_qemu_io
233$QEMU_IO "$BASE_OLD" -c "write -P 0x22 0 $(( CLUSTER_SIZE * 4 ))" \
234    | _filter_qemu_io
235
236echo
237echo "Check the last cluster is zeroed in overlay before the rebase"
238echo
239$QEMU_IO "$OVERLAY" -c "read -P 0x00 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
240    | _filter_qemu_io
241
242echo
243echo "Rebase onto another image in the same chain"
244echo
245
246$QEMU_IMG rebase -b "$BASE_NEW" -F $IMGFMT "$OVERLAY"
247
248echo "Verify that data is read the same before and after rebase"
249echo
250
251# Verify the first 4 clusters are still read the same as in the old base
252$QEMU_IO "$OVERLAY" -c "read -P 0x22 0 $(( CLUSTER_SIZE * 4 ))" \
253    | _filter_qemu_io
254# Verify the last cluster still reads as zeroes
255$QEMU_IO "$OVERLAY" -c "read -P 0x00 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
256    | _filter_qemu_io
257
258echo
259
260# Check that rebase within the chain is working when
261# overlay cluster size > backings cluster size
262# (here overlay cluster size == 2 * backings cluster size)
263#
264# base_new <-- base_old <-- overlay
265#
266# Backing (new): -- -- -- -- -- --
267# Backing (old): -- 11 -- -- 22 --
268# Overlay:      |-- --|-- --|-- --|
269#
270# We should end up having 1st and 3rd cluster allocated, and their halves
271# being read as zeroes.
272
273echo
274echo "=== Test rebase with different cluster sizes ==="
275echo
276
277echo "Creating backing chain"
278echo
279
280TEST_IMG=$BASE_NEW _make_test_img $(( CLUSTER_SIZE * 6 ))
281TEST_IMG=$BASE_OLD _make_test_img -b "$BASE_NEW" -F $IMGFMT \
282    $(( CLUSTER_SIZE * 6 ))
283CLUSTER_SIZE=$(( CLUSTER_SIZE * 2 )) TEST_IMG=$OVERLAY \
284    _make_test_img -b "$BASE_OLD" -F $IMGFMT $(( CLUSTER_SIZE * 6 ))
285
286TEST_IMG=$OVERLAY _img_info | grep -v '^backing file format:'
287
288echo
289echo "Fill backing files with data"
290echo
291
292$QEMU_IO "$BASE_OLD" -c "write -P 0x11 $CLUSTER_SIZE $CLUSTER_SIZE" \
293    -c "write -P 0x22 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
294    | _filter_qemu_io
295
296echo
297echo "Rebase onto another image in the same chain"
298echo
299
300$QEMU_IMG rebase -b "$BASE_NEW" -F $IMGFMT "$OVERLAY"
301
302echo "Verify that data is read the same before and after rebase"
303echo
304
305$QEMU_IO "$OVERLAY" -c "read -P 0x00 0 $CLUSTER_SIZE" \
306    -c "read -P 0x11 $CLUSTER_SIZE $CLUSTER_SIZE" \
307    -c "read -P 0x00 $(( CLUSTER_SIZE * 2 )) $(( CLUSTER_SIZE * 2 ))" \
308    -c "read -P 0x22 $(( CLUSTER_SIZE * 4 )) $CLUSTER_SIZE" \
309    -c "read -P 0x00 $(( CLUSTER_SIZE * 5 )) $CLUSTER_SIZE" \
310    | _filter_qemu_io
311
312echo
313echo "Verify that untouched cluster remains unallocated"
314echo
315
316$QEMU_IMG map "$OVERLAY" | _filter_qemu_img_map
317
318echo
319
320# success, all done
321echo "*** done"
322rm -f $seq.full
323status=0
324