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11a82d14 | 1 | #!/usr/bin/env bash |
9dd003a9 | 2 | # group: rw |
ced14843 HR |
3 | # |
4 | # Test preallocated growth of qcow2 images | |
5 | # | |
6 | # Copyright (C) 2017 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 | |
42a5009d | 23 | owner=hreitz@redhat.com |
ced14843 HR |
24 | |
25 | seq=$(basename $0) | |
26 | echo "QA output created by $seq" | |
27 | ||
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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_image_size_on_host() | |
37 | { | |
f2d86ade | 38 | echo $(($(stat -c '%b * %B' "$TEST_IMG_FILE"))) |
ced14843 HR |
39 | } |
40 | ||
41 | # get standard environment and filters | |
42 | . ./common.rc | |
43 | . ./common.filter | |
44 | ||
45 | _supported_fmt qcow2 | |
46 | _supported_proto file | |
8e958260 AG |
47 | # Growing a file with a backing file (without preallocation=full or |
48 | # =falloc) requires zeroing the newly added area, which is impossible | |
49 | # to do quickly for v2 images, and hence is unsupported. | |
50 | _unsupported_imgopts 'compat=0.10' | |
ced14843 HR |
51 | |
52 | if [ -z "$TEST_IMG_FILE" ]; then | |
53 | TEST_IMG_FILE=$TEST_IMG | |
54 | fi | |
55 | ||
285f595d HR |
56 | # Test whether we are running on a broken XFS version. There is this |
57 | # bug: | |
58 | ||
59 | # $ rm -f foo | |
60 | # $ touch foo | |
61 | # $ block_size=4096 # Your FS's block size | |
62 | # $ fallocate -o $((block_size / 2)) -l $block_size foo | |
63 | # $ LANG=C xfs_bmap foo | grep hole | |
64 | # 1: [8..15]: hole | |
65 | # | |
66 | # The problem is that the XFS driver rounds down the offset and | |
67 | # rounds up the length to the block size, but independently. As | |
68 | # such, it only allocates the first block in the example above, | |
69 | # even though it should allocate the first two blocks (because our | |
70 | # request is to fallocate something that touches both the first | |
71 | # two blocks). | |
72 | # | |
73 | # This means that when you then write to the beginning of the | |
74 | # second block, the disk usage of the first two blocks grows. | |
75 | # | |
76 | # That is precisely what fallocate() promises, though: That when you | |
77 | # write to an area that you have fallocated, no new blocks will have | |
78 | # to be allocated. | |
79 | ||
80 | touch "$TEST_IMG_FILE" | |
81 | # Assuming there is no FS with a block size greater than 64k | |
82 | fallocate -o 65535 -l 2 "$TEST_IMG_FILE" | |
83 | len0=$(get_image_size_on_host) | |
84 | ||
85 | # Write to something that in theory we have just fallocated | |
86 | # (Thus, the on-disk size should not increase) | |
87 | poke_file "$TEST_IMG_FILE" 65536 42 | |
88 | len1=$(get_image_size_on_host) | |
89 | ||
90 | if [ $len1 -gt $len0 ]; then | |
91 | _notrun "the test filesystem's fallocate() is broken" | |
92 | fi | |
93 | ||
94 | rm -f "$TEST_IMG_FILE" | |
95 | ||
ced14843 HR |
96 | # Generally, we create some image with or without existing preallocation and |
97 | # then resize it. Then we write some data into the image and verify that its | |
98 | # size does not change if we have used preallocation. | |
99 | ||
100 | # With a cluster size of 512 B, one L2 table covers 64 * 512 B = 32 kB. | |
101 | # One cluster of the L1 table covers 64 * 32 kB = 2 MB. | |
102 | # There are multiple cases we want to test: | |
103 | # (1) Grow an image without having to allocate a new L2 table. | |
104 | # (2) Grow an image, having to allocate a new L2 table. | |
105 | # (3) Grow an image, having to grow the L1 table. | |
106 | # Therefore, we create an image that is 48 kB below 2 MB. Then: | |
107 | # (1) We resize it to 2 MB - 32 kB. (+ 16 kB) | |
108 | # (2) We resize it to 2 MB. (+ 48 kB) | |
109 | # (3) We resize it to 2 MB + 32 kB. (+ 80 kB) | |
110 | ||
111 | # in B | |
112 | CREATION_SIZE=$((2 * 1024 * 1024 - 48 * 1024)) | |
113 | ||
4c112a39 HR |
114 | # 512 is the actual test -- but it's good to test 64k as well, just to be sure. |
115 | for cluster_size in 512 64k; do | |
ced14843 HR |
116 | # in kB |
117 | for GROWTH_SIZE in 16 48 80; do | |
118 | for create_mode in off metadata falloc full; do | |
119 | for growth_mode in off metadata falloc full; do | |
4c112a39 | 120 | echo "--- cluster_size=$cluster_size growth_size=$GROWTH_SIZE create_mode=$create_mode growth_mode=$growth_mode ---" |
ced14843 | 121 | |
407fb56a | 122 | _make_test_img -o "preallocation=$create_mode,cluster_size=$cluster_size" ${CREATION_SIZE} |
ced14843 HR |
123 | $QEMU_IMG resize -f "$IMGFMT" --preallocation=$growth_mode "$TEST_IMG" +${GROWTH_SIZE}K |
124 | ||
125 | host_size_0=$(get_image_size_on_host) | |
126 | file_length_0=$(stat -c '%s' "$TEST_IMG_FILE") | |
127 | ||
128 | $QEMU_IO -c "write 0 $CREATION_SIZE" "$TEST_IMG" | _filter_qemu_io | |
129 | ||
130 | host_size_1=$(get_image_size_on_host) | |
131 | file_length_1=$(stat -c '%s' "$TEST_IMG_FILE") | |
132 | ||
133 | $QEMU_IO -c "write $CREATION_SIZE ${GROWTH_SIZE}K" "$TEST_IMG" | _filter_qemu_io | |
134 | ||
135 | host_size_2=$(get_image_size_on_host) | |
136 | file_length_2=$(stat -c '%s' "$TEST_IMG_FILE") | |
137 | ||
138 | # Test creation preallocation: Compare #0 against #1 | |
139 | if [ $create_mode != off ]; then | |
140 | # The image length should not have grown | |
141 | if [ $file_length_1 -gt $file_length_0 ]; then | |
142 | echo "ERROR (create): Image length has grown from $file_length_0 to $file_length_1" | |
143 | fi | |
144 | if [ $create_mode != metadata ]; then | |
145 | # The host size should not have grown either | |
146 | if [ $host_size_1 -gt $host_size_0 ]; then | |
147 | echo "ERROR (create): Host size has grown from $host_size_0 to $host_size_1" | |
148 | fi | |
149 | fi | |
150 | fi | |
151 | ||
152 | # Test resize preallocation: Compare #2 against #1 | |
153 | if [ $growth_mode != off ]; then | |
154 | # The image length should not have grown | |
155 | if [ $file_length_2 -gt $file_length_1 ]; then | |
156 | echo "ERROR (grow): Image length has grown from $file_length_1 to $file_length_2" | |
157 | fi | |
e6e8db03 | 158 | if [ $growth_mode != metadata ]; then |
ced14843 HR |
159 | # The host size should not have grown either |
160 | if [ $host_size_2 -gt $host_size_1 ]; then | |
161 | echo "ERROR (grow): Host size has grown from $host_size_1 to $host_size_2" | |
162 | fi | |
163 | fi | |
164 | fi | |
165 | ||
166 | echo | |
167 | done | |
168 | done | |
169 | done | |
4c112a39 | 170 | done |
ced14843 | 171 | |
a5675f39 AG |
172 | # Test image resizing using preallocation and unaligned offsets |
173 | $QEMU_IMG create -f raw "$TEST_IMG.base" 128k | _filter_img_create | |
174 | $QEMU_IO -c 'write -q -P 1 0 128k' -f raw "$TEST_IMG.base" | |
175 | for orig_size in 31k 33k; do | |
8e958260 AG |
176 | for dst_size in 96k 128k; do |
177 | for prealloc in metadata full; do | |
178 | echo "--- Resizing image from $orig_size to $dst_size (preallocation=$prealloc) ---" | |
179 | _make_test_img -F raw -b "$TEST_IMG.base" -o cluster_size=64k "$orig_size" | |
180 | $QEMU_IMG resize -f "$IMGFMT" --preallocation="$prealloc" "$TEST_IMG" "$dst_size" | |
181 | # The first part of the image should contain data from the backing file | |
182 | $QEMU_IO -c "read -q -P 1 0 ${orig_size}" "$TEST_IMG" | |
183 | # The resized part of the image should contain zeroes | |
184 | $QEMU_IO -c "read -q -P 0 ${orig_size} 63k" "$TEST_IMG" | |
185 | # If the image does not have an external data file we can also verify its | |
186 | # actual size. The resized image should have 7 clusters: | |
187 | # header, L1 table, L2 table, refcount table, refcount block, 2 data clusters | |
188 | if ! _get_data_file "$TEST_IMG" > /dev/null; then | |
189 | expected_file_length=$((65536 * 7)) | |
190 | file_length=$(stat -c '%s' "$TEST_IMG_FILE") | |
191 | if [ "$file_length" != "$expected_file_length" ]; then | |
192 | echo "ERROR: file length $file_length (expected $expected_file_length)" | |
193 | fi | |
194 | fi | |
195 | echo | |
196 | done | |
197 | done | |
a5675f39 AG |
198 | done |
199 | ||
ced14843 HR |
200 | # success, all done |
201 | echo '*** done' | |
202 | rm -f $seq.full | |
203 | status=0 |