xref: /openbmc/qemu/tests/qemu-iotests/154 (revision abff1abf)
1#!/usr/bin/env bash
2#
3# qcow2 specific bdrv_pwrite_zeroes tests with backing files (complements 034)
4#
5# Copyright (C) 2016-2017 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=kwolf@redhat.com
23
24seq=`basename $0`
25echo "QA output created by $seq"
26
27status=1	# failure is the default!
28
29_cleanup()
30{
31	_cleanup_test_img
32}
33trap "_cleanup; exit \$status" 0 1 2 3 15
34
35# get standard environment, filters and checks
36. ./common.rc
37. ./common.filter
38
39_supported_fmt qcow2
40_supported_proto file
41_supported_os Linux
42
43CLUSTER_SIZE=4k
44size=$((128 * 1024 * 1024))
45
46# This test requires zero clusters, added in v3 images
47_unsupported_imgopts compat=0.10
48
49echo
50echo == backing file contains zeros ==
51
52CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
53_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
54
55# Make sure that the whole cluster is allocated even for partial write_zeroes
56# when the backing file contains zeros
57
58# X = non-zero data sector in backing file
59# - = sector unallocated in whole backing chain
60# 0 = sector touched by write_zeroes request
61
62# 1. Tail unaligned:    00 00 -- --
63# 2. Head unaligned:    -- -- 00 00
64# 3. Both unaligned:    -- 00 00 --
65# 4. Both, 2 clusters:  -- -- -- 00 | 00 -- -- --
66
67$QEMU_IO -c "write -z 0 2k" "$TEST_IMG" | _filter_qemu_io
68$QEMU_IO -c "write -z 10k 2k" "$TEST_IMG" | _filter_qemu_io
69$QEMU_IO -c "write -z 17k 2k" "$TEST_IMG" | _filter_qemu_io
70$QEMU_IO -c "write -z 27k 2k" "$TEST_IMG" | _filter_qemu_io
71$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
72
73echo
74echo == backing file contains non-zero data before write_zeroes ==
75
76CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
77_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
78
79# Single cluster; non-zero data at the cluster start
80# ... | XX -- 00 -- | ...
81$QEMU_IO -c "write -P 0x11 32k 1k" "$TEST_IMG.base" | _filter_qemu_io
82$QEMU_IO -c "write -z 34k 1k" "$TEST_IMG" | _filter_qemu_io
83$QEMU_IO -c "read -P 0x11 32k 1k" "$TEST_IMG" | _filter_qemu_io
84$QEMU_IO -c "read -P 0 33k 3k" "$TEST_IMG" | _filter_qemu_io
85
86# Single cluster; non-zero data exists, but not at the cluster start
87# ... | -- XX 00 -- | ...
88$QEMU_IO -c "write -P 0x11 65k 1k" "$TEST_IMG.base" | _filter_qemu_io
89$QEMU_IO -c "write -z 66k 1k" "$TEST_IMG" | _filter_qemu_io
90$QEMU_IO -c "read -P 0x11 65k 1k" "$TEST_IMG" | _filter_qemu_io
91$QEMU_IO -c "read -P 0 64k 1k" "$TEST_IMG" | _filter_qemu_io
92$QEMU_IO -c "read -P 0 66k 2k" "$TEST_IMG" | _filter_qemu_io
93
94$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
95
96echo
97echo == backing file contains non-zero data after write_zeroes ==
98
99CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
100_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
101
102# Single cluster; non-zero data directly after request
103# ... | -- 00 XX -- | ...
104$QEMU_IO -c "write -P 0x11 34k 1k" "$TEST_IMG.base" | _filter_qemu_io
105$QEMU_IO -c "write -z 33k 1k" "$TEST_IMG" | _filter_qemu_io
106$QEMU_IO -c "read -P 0 32k 2k" "$TEST_IMG" | _filter_qemu_io
107$QEMU_IO -c "read -P 0x11 34k 1k" "$TEST_IMG" | _filter_qemu_io
108$QEMU_IO -c "read -P 0 35k 1k" "$TEST_IMG" | _filter_qemu_io
109
110# Single cluster; non-zero data exists, but not directly after request
111# ... | -- 00 -- XX | ...
112$QEMU_IO -c "write -P 0x11 43k 1k" "$TEST_IMG.base" | _filter_qemu_io
113$QEMU_IO -c "write -z 41k 1k" "$TEST_IMG" | _filter_qemu_io
114$QEMU_IO -c "read -P 0x11 43k 1k" "$TEST_IMG" | _filter_qemu_io
115$QEMU_IO -c "read -P 0 40k 3k" "$TEST_IMG" | _filter_qemu_io
116
117$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
118
119echo
120echo == write_zeroes covers non-zero data ==
121
122CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
123_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
124
125# non-zero data at front of request
126# Backing file: -- XX -- --
127# Active layer: -- 00 00 --
128
129$QEMU_IO -c "write -P 0x11 5k 1k" "$TEST_IMG.base" | _filter_qemu_io
130$QEMU_IO -c "write -z 5k 2k" "$TEST_IMG" | _filter_qemu_io
131$QEMU_IO -c "read -P 0 4k 4k" "$TEST_IMG" | _filter_qemu_io
132
133# non-zero data at end of request
134# Backing file: -- -- XX --
135# Active layer: -- 00 00 --
136
137$QEMU_IO -c "write -P 0x11 14k 1k" "$TEST_IMG.base" | _filter_qemu_io
138$QEMU_IO -c "write -z 13k 2k" "$TEST_IMG" | _filter_qemu_io
139$QEMU_IO -c "read -P 0 12k 4k" "$TEST_IMG" | _filter_qemu_io
140
141# non-zero data matches size of request
142# Backing file: -- XX XX --
143# Active layer: -- 00 00 --
144
145$QEMU_IO -c "write -P 0x11 21k 2k" "$TEST_IMG.base" | _filter_qemu_io
146$QEMU_IO -c "write -z 21k 2k" "$TEST_IMG" | _filter_qemu_io
147$QEMU_IO -c "read -P 0 20k 4k" "$TEST_IMG" | _filter_qemu_io
148
149# non-zero data smaller than request
150# Backing file: -- -X X- --
151# Active layer: -- 00 00 --
152
153$QEMU_IO -c "write -P 0x11 30208 1k" "$TEST_IMG.base" | _filter_qemu_io
154$QEMU_IO -c "write -z 29k 2k" "$TEST_IMG" | _filter_qemu_io
155$QEMU_IO -c "read -P 0 28k 4k" "$TEST_IMG" | _filter_qemu_io
156
157$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
158
159echo
160echo == spanning two clusters, non-zero before request ==
161
162CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
163_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
164
165# Two clusters; non-zero data before request:
166# 1. At cluster start:          32k: XX -- -- 00 | 00 -- -- --
167# 2. Between unallocated space: 48k: -- XX -- 00 | 00 -- -- --
168# 3. Directly before request:   64k: -- -- XX 00 | 00 -- -- --
169
170$QEMU_IO -c "write -P 0x11 32k 1k" "$TEST_IMG.base" | _filter_qemu_io
171$QEMU_IO -c "write -z 35k 2k" "$TEST_IMG" | _filter_qemu_io
172$QEMU_IO -c "read -P 0x11 32k 1k" "$TEST_IMG" | _filter_qemu_io
173$QEMU_IO -c "read -P 0 33k 7k" "$TEST_IMG" | _filter_qemu_io
174
175$QEMU_IO -c "write -P 0x11 49k 1k" "$TEST_IMG.base" | _filter_qemu_io
176$QEMU_IO -c "write -z 51k 2k" "$TEST_IMG" | _filter_qemu_io
177$QEMU_IO -c "read -P 0 48k 1k" "$TEST_IMG" | _filter_qemu_io
178$QEMU_IO -c "read -P 0x11 49k 1k" "$TEST_IMG" | _filter_qemu_io
179$QEMU_IO -c "read -P 0 50k 6k" "$TEST_IMG" | _filter_qemu_io
180
181$QEMU_IO -c "write -P 0x11 66k 1k" "$TEST_IMG.base" | _filter_qemu_io
182$QEMU_IO -c "write -z 67k 2k" "$TEST_IMG" | _filter_qemu_io
183$QEMU_IO -c "read -P 0 64k 2k" "$TEST_IMG" | _filter_qemu_io
184$QEMU_IO -c "read -P 0x11 66k 1k" "$TEST_IMG" | _filter_qemu_io
185$QEMU_IO -c "read -P 0 67k 5k" "$TEST_IMG" | _filter_qemu_io
186
187$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
188
189echo
190echo == spanning two clusters, non-zero after request ==
191
192CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
193_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
194
195# Two clusters; non-zero data after request:
196# 1. Directly after request:    32k: -- -- -- 00 | 00 XX -- --
197# 2. Between unallocated space: 48k: -- -- -- 00 | 00 -- XX --
198# 3. At cluster end:            64k: -- -- -- 00 | 00 -- -- XX
199
200$QEMU_IO -c "write -P 0x11 37k 1k" "$TEST_IMG.base" | _filter_qemu_io
201$QEMU_IO -c "write -z 35k 2k" "$TEST_IMG" | _filter_qemu_io
202$QEMU_IO -c "read -P 0 32k 5k" "$TEST_IMG" | _filter_qemu_io
203$QEMU_IO -c "read -P 0x11 37k 1k" "$TEST_IMG" | _filter_qemu_io
204$QEMU_IO -c "read -P 0 38k 2k" "$TEST_IMG" | _filter_qemu_io
205
206$QEMU_IO -c "write -P 0x11 54k 1k" "$TEST_IMG.base" | _filter_qemu_io
207$QEMU_IO -c "write -z 51k 2k" "$TEST_IMG" | _filter_qemu_io
208$QEMU_IO -c "read -P 0 48k 6k" "$TEST_IMG" | _filter_qemu_io
209$QEMU_IO -c "read -P 0x11 54k 1k" "$TEST_IMG" | _filter_qemu_io
210$QEMU_IO -c "read -P 0 55k 1k" "$TEST_IMG" | _filter_qemu_io
211
212$QEMU_IO -c "write -P 0x11 71k 1k" "$TEST_IMG.base" | _filter_qemu_io
213$QEMU_IO -c "write -z 67k 2k" "$TEST_IMG" | _filter_qemu_io
214$QEMU_IO -c "read -P 0 64k 7k" "$TEST_IMG" | _filter_qemu_io
215$QEMU_IO -c "read -P 0x11 71k 1k" "$TEST_IMG" | _filter_qemu_io
216
217$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
218
219echo
220echo == spanning two clusters, partially overwriting backing file ==
221
222CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
223_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
224
225# Backing file: -- -- XX XX | XX XX -- --
226# Active layer: -- -- XX 00 | 00 XX -- --
227
228$QEMU_IO -c "write -P 0x11 2k 4k" "$TEST_IMG.base" | _filter_qemu_io
229$QEMU_IO -c "write -z 3k 2k" "$TEST_IMG" | _filter_qemu_io
230$QEMU_IO -c "read -P 0 0k 2k" "$TEST_IMG" | _filter_qemu_io
231$QEMU_IO -c "read -P 0x11 2k 1k" "$TEST_IMG" | _filter_qemu_io
232$QEMU_IO -c "read -P 0 3k 2k" "$TEST_IMG" | _filter_qemu_io
233$QEMU_IO -c "read -P 0x11 5k 1k" "$TEST_IMG" | _filter_qemu_io
234$QEMU_IO -c "read -P 0 6k 2k" "$TEST_IMG" | _filter_qemu_io
235
236$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
237
238echo
239echo == spanning multiple clusters, non-zero in first cluster ==
240
241CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
242_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
243
244# Backing file: 64k: XX XX -- -- | -- -- -- -- | -- -- -- --
245# Active layer: 64k: XX XX 00 00 | 00 00 00 00 | 00 -- -- --
246
247$QEMU_IO -c "write -P 0x11 64k 2k" "$TEST_IMG.base" | _filter_qemu_io
248$QEMU_IO -c "write -z 66k 7k" "$TEST_IMG" | _filter_qemu_io
249$QEMU_IO -c "read -P 0x11 64k 2k" "$TEST_IMG" | _filter_qemu_io
250$QEMU_IO -c "read -P 0 66k 10k" "$TEST_IMG" | _filter_qemu_io
251
252$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
253
254echo
255echo == spanning multiple clusters, non-zero in intermediate cluster ==
256
257CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
258_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
259
260# Backing file: 64k: -- -- -- -- | -- XX XX -- | -- -- -- --
261# Active layer: 64k: -- -- 00 00 | 00 00 00 00 | 00 -- -- --
262
263$QEMU_IO -c "write -P 0x11 69k 2k" "$TEST_IMG.base" | _filter_qemu_io
264$QEMU_IO -c "write -z 66k 7k" "$TEST_IMG" | _filter_qemu_io
265$QEMU_IO -c "read -P 0 64k 12k" "$TEST_IMG" | _filter_qemu_io
266
267$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
268
269echo
270echo == spanning multiple clusters, non-zero in final cluster ==
271
272CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
273_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
274
275# Backing file: 64k: -- -- -- -- | -- -- -- -- | -- -- XX XX
276# Active layer: 64k: -- -- 00 00 | 00 00 00 00 | 00 -- XX XX
277
278$QEMU_IO -c "write -P 0x11 74k 2k" "$TEST_IMG.base" | _filter_qemu_io
279$QEMU_IO -c "write -z 66k 7k" "$TEST_IMG" | _filter_qemu_io
280$QEMU_IO -c "read -P 0 64k 10k" "$TEST_IMG" | _filter_qemu_io
281$QEMU_IO -c "read -P 0x11 74k 2k" "$TEST_IMG" | _filter_qemu_io
282
283$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
284
285echo
286echo == spanning multiple clusters, partially overwriting backing file ==
287
288CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $size
289_make_test_img -b "$TEST_IMG.base" -F $IMGFMT
290
291# Backing file: 64k: -- XX XX XX | XX XX XX XX | XX XX XX --
292# Active layer: 64k: -- XX 00 00 | 00 00 00 00 | 00 XX XX --
293
294$QEMU_IO -c "write -P 0x11 65k 10k" "$TEST_IMG.base" | _filter_qemu_io
295$QEMU_IO -c "write -z 66k 7k" "$TEST_IMG" | _filter_qemu_io
296$QEMU_IO -c "read -P 0 64k 1k" "$TEST_IMG" | _filter_qemu_io
297$QEMU_IO -c "read -P 0x11 65k 1k" "$TEST_IMG" | _filter_qemu_io
298$QEMU_IO -c "read -P 0 66k 7k" "$TEST_IMG" | _filter_qemu_io
299$QEMU_IO -c "read -P 0x11 73k 2k" "$TEST_IMG" | _filter_qemu_io
300$QEMU_IO -c "read -P 0 75k 1k" "$TEST_IMG" | _filter_qemu_io
301
302$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
303
304echo
305echo == unaligned image tail cluster, no allocation needed ==
306
307# With no backing file, write to all or part of unallocated partial cluster
308# will mark the cluster as zero, but does not allocate.
309# Re-create the image each time to get back to unallocated clusters.
310
311# Write at the front: sector-wise, the request is: 128m... | 00 -- -- --
312_make_test_img $((size + 2048))
313$QEMU_IO -c "write -z $size 512" "$TEST_IMG" | _filter_qemu_io
314$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
315$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
316
317# Write at the back: sector-wise, the request is: 128m... | -- -- -- 00
318_make_test_img $((size + 2048))
319$QEMU_IO -c "write -z $((size + 1536)) 512" "$TEST_IMG" | _filter_qemu_io
320$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
321$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
322
323# Write at middle: sector-wise, the request is: 128m... | -- 00 00 --
324_make_test_img $((size + 2048))
325$QEMU_IO -c "write -z $((size + 512)) 1024" "$TEST_IMG" | _filter_qemu_io
326$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
327$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
328
329# Write entire cluster: sector-wise, the request is: 128m... | 00 00 00 00
330_make_test_img $((size + 2048))
331$QEMU_IO -c "write -z $size 2048" "$TEST_IMG" | _filter_qemu_io
332$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
333$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
334
335# Repeat with backing file holding unallocated cluster.
336CLUSTER_SIZE=2048 TEST_IMG="$TEST_IMG.base" _make_test_img $((size + 1024))
337
338# Write at the front: sector-wise, the request is:
339# backing: 128m... | -- --
340# active:  128m... | 00 -- -- --
341_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
342$QEMU_IO -c "write -z $size 512" "$TEST_IMG" | _filter_qemu_io
343$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
344$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
345
346# Write at the back: sector-wise, the request is:
347# backing: 128m... | -- --
348# active:  128m... | -- -- -- 00
349_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
350$QEMU_IO -c "write -z $((size + 1536)) 512" "$TEST_IMG" | _filter_qemu_io
351$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
352$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
353
354# Write at middle: sector-wise, the request is:
355# backing: 128m... | -- --
356# active:  128m... | -- 00 00 --
357_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
358$QEMU_IO -c "write -z $((size + 512)) 1024" "$TEST_IMG" | _filter_qemu_io
359$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
360$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
361
362# Write entire cluster: sector-wise, the request is:
363# backing: 128m... | -- --
364# active:  128m... | 00 00 00 00
365_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
366$QEMU_IO -c "write -z $size 2048" "$TEST_IMG" | _filter_qemu_io
367$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
368$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
369
370# Repeat with backing file holding zero'd cluster
371$QEMU_IO -c "write -z $size 512" "$TEST_IMG.base" | _filter_qemu_io
372
373# Write at the front: sector-wise, the request is:
374# backing: 128m... | 00 00
375# active:  128m... | 00 -- -- --
376_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
377$QEMU_IO -c "write -z $size 512" "$TEST_IMG" | _filter_qemu_io
378$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
379$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
380
381# Write at the back: sector-wise, the request is:
382# backing: 128m... | 00 00
383# active:  128m... | -- -- -- 00
384_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
385$QEMU_IO -c "write -z $((size + 1536)) 512" "$TEST_IMG" | _filter_qemu_io
386$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
387$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
388
389# Write at middle: sector-wise, the request is:
390# backing: 128m... | 00 00
391# active:  128m... | -- 00 00 --
392_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
393$QEMU_IO -c "write -z $((size + 512)) 1024" "$TEST_IMG" | _filter_qemu_io
394$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
395$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
396
397# Write entire cluster: sector-wise, the request is:
398# backing: 128m... | 00 00
399# active:  128m... | 00 00 00 00
400_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
401$QEMU_IO -c "write -z $size 2048" "$TEST_IMG" | _filter_qemu_io
402$QEMU_IO -c "alloc $size 2048" "$TEST_IMG" | _filter_qemu_io
403$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
404
405# A preallocated cluster maintains its allocation, whether it stays as
406# data due to a partial write:
407# Convert 128m... | XX XX => ... | XX 00
408_make_test_img $((size + 1024))
409$QEMU_IO -c "write -P 1 $((size)) 1024" "$TEST_IMG" | _filter_qemu_io
410$QEMU_IO -c "write -z $((size + 512)) 512" "$TEST_IMG" | _filter_qemu_io
411$QEMU_IO -c "read -P 1 $((size)) 512" "$TEST_IMG" | _filter_qemu_io
412$QEMU_IO -c "read -P 0 $((size + 512)) 512" "$TEST_IMG" | _filter_qemu_io
413$QEMU_IO -c "alloc $size 1024" "$TEST_IMG" | _filter_qemu_io
414$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
415
416# or because it is the entire cluster and can use the zero flag:
417# Convert 128m... | XX XX => ... | 00 00
418$QEMU_IO -c "write -z $((size)) 1024" "$TEST_IMG" | _filter_qemu_io
419$QEMU_IO -c "alloc $size 1024" "$TEST_IMG" | _filter_qemu_io
420$QEMU_IO -c "read -P 0 $size 1024" "$TEST_IMG" | _filter_qemu_io
421$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
422
423echo
424echo == unaligned image tail cluster, allocation required ==
425
426# Write beyond backing file must COW
427# Backing file: 128m... | XX --
428# Active layer: 128m... | -- -- 00 --
429CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $((size + 1024))
430_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
431$QEMU_IO -c "write -P 1 $((size)) 512" "$TEST_IMG.base" | _filter_qemu_io
432$QEMU_IO -c "write -z $((size + 1024)) 512" "$TEST_IMG" | _filter_qemu_io
433$QEMU_IO -c "read -P 1 $((size)) 512" "$TEST_IMG" | _filter_qemu_io
434$QEMU_IO -c "read -P 0 $((size + 512)) 1536" "$TEST_IMG" | _filter_qemu_io
435$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
436
437# Writes at boundaries of (partial) cluster must not lose mid-cluster data
438# Backing file: 128m: ... | -- XX
439# Active layer: 128m: ... | 00 -- -- 00
440CLUSTER_SIZE=512 TEST_IMG="$TEST_IMG.base" _make_test_img $((size + 1024))
441_make_test_img -b "$TEST_IMG.base" -F $IMGFMT $((size + 2048))
442$QEMU_IO -c "write -P 1 $((size + 512)) 512" "$TEST_IMG.base" | _filter_qemu_io
443$QEMU_IO -c "write -z $((size)) 512" "$TEST_IMG" | _filter_qemu_io
444$QEMU_IO -c "read -P 0 $((size)) 512" "$TEST_IMG" | _filter_qemu_io
445$QEMU_IO -c "read -P 1 $((size + 512)) 512" "$TEST_IMG" | _filter_qemu_io
446$QEMU_IO -c "read -P 0 $((size + 1024)) 1024" "$TEST_IMG" | _filter_qemu_io
447$QEMU_IO -c "write -z $((size + 1536)) 512" "$TEST_IMG" | _filter_qemu_io
448$QEMU_IO -c "read -P 0 $((size)) 512" "$TEST_IMG" | _filter_qemu_io
449$QEMU_IO -c "read -P 1 $((size + 512)) 512" "$TEST_IMG" | _filter_qemu_io
450$QEMU_IO -c "read -P 0 $((size + 1024)) 1024" "$TEST_IMG" | _filter_qemu_io
451$QEMU_IMG map --output=json "$TEST_IMG" | _filter_qemu_img_map
452
453# success, all done
454echo "*** done"
455rm -f $seq.full
456status=0
457