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1 | #!/usr/bin/env bash | |
2 | # group: rw | |
3 | # | |
4 | # Test cases for different refcount_bits values | |
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 | |
23 | owner=hreitz@redhat.com | |
24 | ||
25 | seq="$(basename $0)" | |
26 | echo "QA output created by $seq" | |
27 | ||
28 | status=1 # failure is the default! | |
29 | ||
30 | _cleanup() | |
31 | { | |
32 | _cleanup_test_img | |
33 | } | |
34 | trap "_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 | # This test will set refcount_bits on its own which would conflict with the | |
44 | # manual setting; compat will be overridden as well; | |
45 | # and external data files do not work well with our refcount testing | |
46 | # also, compression type is not supported with compat=0.10 used in test | |
47 | _unsupported_imgopts refcount_bits 'compat=0.10' data_file compression_type | |
48 | ||
49 | print_refcount_bits() | |
50 | { | |
51 | $QEMU_IMG info "$TEST_IMG" | sed -n '/refcount bits:/ s/^ *//p' | |
52 | } | |
53 | ||
54 | echo | |
55 | echo '=== refcount_bits limits ===' | |
56 | echo | |
57 | ||
58 | # Must be positive (non-zero) | |
59 | _make_test_img -o "refcount_bits=0" 64M | |
60 | # Must be positive (non-negative) | |
61 | _make_test_img -o "refcount_bits=-1" 64M | |
62 | # May not exceed 64 | |
63 | _make_test_img -o "refcount_bits=128" 64M | |
64 | # Must be a power of two | |
65 | _make_test_img -o "refcount_bits=42" 64M | |
66 | ||
67 | # 1 is the minimum | |
68 | _make_test_img -o "refcount_bits=1" 64M | |
69 | print_refcount_bits | |
70 | ||
71 | # 64 is the maximum | |
72 | _make_test_img -o "refcount_bits=64" 64M | |
73 | print_refcount_bits | |
74 | ||
75 | # 16 is the default | |
76 | _make_test_img 64M | |
77 | print_refcount_bits | |
78 | ||
79 | echo | |
80 | echo '=== refcount_bits and compat=0.10 ===' | |
81 | echo | |
82 | ||
83 | # Should work | |
84 | _make_test_img -o "compat=0.10,refcount_bits=16" 64M | |
85 | print_refcount_bits | |
86 | ||
87 | # Should not work | |
88 | _make_test_img -o "compat=0.10,refcount_bits=1" 64M | |
89 | _make_test_img -o "compat=0.10,refcount_bits=64" 64M | |
90 | ||
91 | ||
92 | echo | |
93 | echo '=== Snapshot limit on refcount_bits=1 ===' | |
94 | echo | |
95 | ||
96 | _make_test_img -o "refcount_bits=1" 64M | |
97 | print_refcount_bits | |
98 | ||
99 | $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
100 | ||
101 | # Should fail for now; in the future, this might be supported by automatically | |
102 | # copying all clusters with overflowing refcount | |
103 | $QEMU_IMG snapshot -c foo "$TEST_IMG" | |
104 | ||
105 | # The new L1 table could/should be leaked | |
106 | _check_test_img | |
107 | ||
108 | echo | |
109 | echo '=== Snapshot limit on refcount_bits=2 ===' | |
110 | echo | |
111 | ||
112 | _make_test_img -o "refcount_bits=2" 64M | |
113 | print_refcount_bits | |
114 | ||
115 | $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
116 | ||
117 | # Should succeed | |
118 | $QEMU_IMG snapshot -c foo "$TEST_IMG" | |
119 | $QEMU_IMG snapshot -c bar "$TEST_IMG" | |
120 | # Should fail (4th reference) | |
121 | $QEMU_IMG snapshot -c baz "$TEST_IMG" | |
122 | ||
123 | # The new L1 table could/should be leaked | |
124 | _check_test_img | |
125 | ||
126 | echo | |
127 | echo '=== Compressed clusters with refcount_bits=1 ===' | |
128 | echo | |
129 | ||
130 | _make_test_img -o "refcount_bits=1" 64M | |
131 | print_refcount_bits | |
132 | ||
133 | # Both should fit into a single host cluster; instead of failing to increase the | |
134 | # refcount of that cluster, qemu should just allocate a new cluster and make | |
135 | # this operation succeed | |
136 | $QEMU_IO -c 'write -P 0 -c 0 64k' \ | |
137 | -c 'write -P 1 -c 64k 64k' \ | |
138 | "$TEST_IMG" | _filter_qemu_io | |
139 | ||
140 | _check_test_img | |
141 | ||
142 | echo | |
143 | echo '=== MSb set in 64 bit refcount ===' | |
144 | echo | |
145 | ||
146 | _make_test_img -o "refcount_bits=64" 64M | |
147 | print_refcount_bits | |
148 | ||
149 | $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
150 | ||
151 | # Set the MSb in the refblock entry of the data cluster | |
152 | poke_file "$TEST_IMG" $((0x20028)) "\x80\x00\x00\x00\x00\x00\x00\x00" | |
153 | ||
154 | # Clear OFLAG_COPIED in the L2 entry of the data cluster | |
155 | poke_file "$TEST_IMG" $((0x40000)) "\x00\x00\x00\x00\x00\x05\x00\x00" | |
156 | ||
157 | # Try to write to that cluster (should work, even though the MSb is set) | |
158 | $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
159 | ||
160 | echo | |
161 | echo '=== Snapshot on maximum 64 bit refcount value ===' | |
162 | echo | |
163 | ||
164 | _make_test_img -o "refcount_bits=64" 64M | |
165 | print_refcount_bits | |
166 | ||
167 | $QEMU_IO -c 'write 0 512' "$TEST_IMG" | _filter_qemu_io | |
168 | ||
169 | # Set the refblock entry to the maximum value possible | |
170 | poke_file "$TEST_IMG" $((0x20028)) "\xff\xff\xff\xff\xff\xff\xff\xff" | |
171 | ||
172 | # Clear OFLAG_COPIED in the L2 entry of the data cluster | |
173 | poke_file "$TEST_IMG" $((0x40000)) "\x00\x00\x00\x00\x00\x05\x00\x00" | |
174 | ||
175 | # Try a snapshot (should correctly identify the overflow; may work in the future | |
176 | # by falling back to COW) | |
177 | $QEMU_IMG snapshot -c foo "$TEST_IMG" | |
178 | ||
179 | # The new L1 table could/should be leaked; and obviously the data cluster is | |
180 | # leaked (refcount=UINT64_MAX reference=1) | |
181 | _check_test_img | |
182 | ||
183 | echo | |
184 | echo '=== Amend from refcount_bits=16 to refcount_bits=1 ===' | |
185 | echo | |
186 | ||
187 | _make_test_img 64M | |
188 | print_refcount_bits | |
189 | ||
190 | $QEMU_IO -c 'write 16M 32M' "$TEST_IMG" | _filter_qemu_io | |
191 | $QEMU_IMG amend -o refcount_bits=1 "$TEST_IMG" | |
192 | _check_test_img | |
193 | print_refcount_bits | |
194 | ||
195 | echo | |
196 | echo '=== Amend from refcount_bits=1 to refcount_bits=64 ===' | |
197 | echo | |
198 | ||
199 | $QEMU_IMG amend -o refcount_bits=64 "$TEST_IMG" | |
200 | _check_test_img | |
201 | print_refcount_bits | |
202 | ||
203 | echo | |
204 | echo '=== Amend to compat=0.10 ===' | |
205 | echo | |
206 | ||
207 | # Should not work because refcount_bits needs to be 16 for compat=0.10 | |
208 | $QEMU_IMG amend -o compat=0.10 "$TEST_IMG" | |
209 | print_refcount_bits | |
210 | # Should work | |
211 | $QEMU_IMG amend -o compat=0.10,refcount_bits=16 "$TEST_IMG" | |
212 | _check_test_img | |
213 | print_refcount_bits | |
214 | ||
215 | # Get back to compat=1.1 and refcount_bits=16 | |
216 | $QEMU_IMG amend -o compat=1.1 "$TEST_IMG" | |
217 | print_refcount_bits | |
218 | # Should not work | |
219 | $QEMU_IMG amend -o refcount_bits=32,compat=0.10 "$TEST_IMG" | |
220 | print_refcount_bits | |
221 | ||
222 | echo | |
223 | echo '=== Amend with snapshot ===' | |
224 | echo | |
225 | ||
226 | $QEMU_IMG snapshot -c foo "$TEST_IMG" | |
227 | # Just to have different refcounts across the image | |
228 | $QEMU_IO -c 'write 0 16M' "$TEST_IMG" | _filter_qemu_io | |
229 | ||
230 | # Should not work (may work in the future by first decreasing all refcounts so | |
231 | # they fit into the target range by copying them) | |
232 | $QEMU_IMG amend -o refcount_bits=1 "$TEST_IMG" | |
233 | _check_test_img | |
234 | print_refcount_bits | |
235 | ||
236 | # Should work | |
237 | $QEMU_IMG amend -o refcount_bits=2 "$TEST_IMG" | |
238 | _check_test_img | |
239 | print_refcount_bits | |
240 | ||
241 | echo | |
242 | echo '=== Testing too many references for check ===' | |
243 | echo | |
244 | ||
245 | _make_test_img -o "refcount_bits=1" 64M | |
246 | print_refcount_bits | |
247 | ||
248 | # This cluster should be created at 0x50000 | |
249 | $QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io | |
250 | # Now make the second L2 entry (the L2 table should be at 0x40000) point to that | |
251 | # cluster, so we have two references | |
252 | poke_file "$TEST_IMG" $((0x40008)) "\x80\x00\x00\x00\x00\x05\x00\x00" | |
253 | ||
254 | # This should say "please use amend" | |
255 | _check_test_img -r all | |
256 | ||
257 | # So we do that | |
258 | $QEMU_IMG amend -o refcount_bits=2 "$TEST_IMG" | |
259 | print_refcount_bits | |
260 | ||
261 | # And try again | |
262 | _check_test_img -r all | |
263 | ||
264 | echo | |
265 | echo '=== Multiple walks necessary during amend ===' | |
266 | echo | |
267 | ||
268 | _make_test_img -o "refcount_bits=1,cluster_size=512" 64k | |
269 | ||
270 | # Cluster 0 is the image header, clusters 1 to 4 are used by the L1 table, a | |
271 | # single L2 table, the reftable and a single refblock. This creates 58 data | |
272 | # clusters (actually, the L2 table is created here, too), so in total there are | |
273 | # then 63 used clusters in the image. With a refcount width of 64, one refblock | |
274 | # describes 64 clusters (512 bytes / 64 bits/entry = 64 entries), so this will | |
275 | # make the first refblock in the amended image have exactly one free entry. | |
276 | $QEMU_IO -c "write 0 $((58 * 512))" "$TEST_IMG" | _filter_qemu_io | |
277 | ||
278 | # Now change the refcount width; since the first new refblock will have exactly | |
279 | # one free entry, that entry will be used to store its own reference. No other | |
280 | # refblocks are needed, so then the new reftable will be allocated; since the | |
281 | # first new refblock is completely filled up, this will require a new refblock | |
282 | # which is why the refcount width changing function will need to run through | |
283 | # everything one more time until the allocations are stable. | |
284 | # Having more walks than usual should be visible as regressing progress (from | |
285 | # 66.67 % (2/3 walks) to 50.00 % (2/4 walks)). | |
286 | $QEMU_IMG amend -o refcount_bits=64 -p "$TEST_IMG" | tr '\r' '\n' \ | |
287 | | grep -A 1 '66.67' | |
288 | print_refcount_bits | |
289 | ||
290 | _check_test_img | |
291 | ||
292 | ||
293 | # success, all done | |
294 | echo '*** done' | |
295 | rm -f $seq.full | |
296 | status=0 |