1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2013 Fusion IO. All rights reserved.
4 */
5
6 #include <linux/slab.h>
7 #include "btrfs-tests.h"
8 #include "../ctree.h"
9 #include "../extent_io.h"
10 #include "../disk-io.h"
11 #include "../accessors.h"
12
13 static int test_btrfs_split_item(u32 sectorsize, u32 nodesize)
14 {
15 struct btrfs_fs_info *fs_info;
16 struct btrfs_path *path = NULL;
17 struct btrfs_root *root = NULL;
18 struct extent_buffer *eb;
19 char *value = "mary had a little lamb";
20 char *split1 = "mary had a little";
21 char *split2 = " lamb";
22 char *split3 = "mary";
23 char *split4 = " had a little";
24 char buf[32];
25 struct btrfs_key key;
26 u32 value_len = strlen(value);
27 int ret = 0;
28
29 test_msg("running btrfs_split_item tests");
30
31 fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
32 if (!fs_info) {
33 test_std_err(TEST_ALLOC_FS_INFO);
34 return -ENOMEM;
35 }
36
37 root = btrfs_alloc_dummy_root(fs_info);
38 if (IS_ERR(root)) {
39 test_std_err(TEST_ALLOC_ROOT);
40 ret = PTR_ERR(root);
41 goto out;
42 }
43
44 path = btrfs_alloc_path();
45 if (!path) {
46 test_std_err(TEST_ALLOC_PATH);
47 ret = -ENOMEM;
48 goto out;
49 }
50
51 eb = alloc_dummy_extent_buffer(fs_info, nodesize);
52 path->nodes[0] = eb;
53 if (!eb) {
54 test_std_err(TEST_ALLOC_EXTENT_BUFFER);
55 ret = -ENOMEM;
56 goto out;
57 }
58 path->slots[0] = 0;
59
60 key.objectid = 0;
61 key.type = BTRFS_EXTENT_CSUM_KEY;
62 key.offset = 0;
63
64 /*
65 * Passing a NULL trans handle is fine here, we have a dummy root eb
66 * and the tree is a single node (level 0).
67 */
68 btrfs_setup_item_for_insert(NULL, root, path, &key, value_len);
69 write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0),
70 value_len);
71
72 key.offset = 3;
73
74 /*
75 * Passing NULL trans here should be safe because we have plenty of
76 * space in this leaf to split the item without having to split the
77 * leaf.
78 */
79 ret = btrfs_split_item(NULL, root, path, &key, 17);
80 if (ret) {
81 test_err("split item failed %d", ret);
82 goto out;
83 }
84
85 /*
86 * Read the first slot, it should have the original key and contain only
87 * 'mary had a little'
88 */
89 btrfs_item_key_to_cpu(eb, &key, 0);
90 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
91 key.offset != 0) {
92 test_err("invalid key at slot 0");
93 ret = -EINVAL;
94 goto out;
95 }
96
97 if (btrfs_item_size(eb, 0) != strlen(split1)) {
98 test_err("invalid len in the first split");
99 ret = -EINVAL;
100 goto out;
101 }
102
103 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
104 strlen(split1));
105 if (memcmp(buf, split1, strlen(split1))) {
106 test_err(
107 "data in the buffer doesn't match what it should in the first split have='%.*s' want '%s'",
108 (int)strlen(split1), buf, split1);
109 ret = -EINVAL;
110 goto out;
111 }
112
113 btrfs_item_key_to_cpu(eb, &key, 1);
114 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
115 key.offset != 3) {
116 test_err("invalid key at slot 1");
117 ret = -EINVAL;
118 goto out;
119 }
120
121 if (btrfs_item_size(eb, 1) != strlen(split2)) {
122 test_err("invalid len in the second split");
123 ret = -EINVAL;
124 goto out;
125 }
126
127 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
128 strlen(split2));
129 if (memcmp(buf, split2, strlen(split2))) {
130 test_err(
131 "data in the buffer doesn't match what it should in the second split");
132 ret = -EINVAL;
133 goto out;
134 }
135
136 key.offset = 1;
137 /* Do it again so we test memmoving the other items in the leaf */
138 ret = btrfs_split_item(NULL, root, path, &key, 4);
139 if (ret) {
140 test_err("second split item failed %d", ret);
141 goto out;
142 }
143
144 btrfs_item_key_to_cpu(eb, &key, 0);
145 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
146 key.offset != 0) {
147 test_err("invalid key at slot 0");
148 ret = -EINVAL;
149 goto out;
150 }
151
152 if (btrfs_item_size(eb, 0) != strlen(split3)) {
153 test_err("invalid len in the first split");
154 ret = -EINVAL;
155 goto out;
156 }
157
158 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 0),
159 strlen(split3));
160 if (memcmp(buf, split3, strlen(split3))) {
161 test_err(
162 "data in the buffer doesn't match what it should in the third split");
163 ret = -EINVAL;
164 goto out;
165 }
166
167 btrfs_item_key_to_cpu(eb, &key, 1);
168 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
169 key.offset != 1) {
170 test_err("invalid key at slot 1");
171 ret = -EINVAL;
172 goto out;
173 }
174
175 if (btrfs_item_size(eb, 1) != strlen(split4)) {
176 test_err("invalid len in the second split");
177 ret = -EINVAL;
178 goto out;
179 }
180
181 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 1),
182 strlen(split4));
183 if (memcmp(buf, split4, strlen(split4))) {
184 test_err(
185 "data in the buffer doesn't match what it should in the fourth split");
186 ret = -EINVAL;
187 goto out;
188 }
189
190 btrfs_item_key_to_cpu(eb, &key, 2);
191 if (key.objectid != 0 || key.type != BTRFS_EXTENT_CSUM_KEY ||
192 key.offset != 3) {
193 test_err("invalid key at slot 2");
194 ret = -EINVAL;
195 goto out;
196 }
197
198 if (btrfs_item_size(eb, 2) != strlen(split2)) {
199 test_err("invalid len in the second split");
200 ret = -EINVAL;
201 goto out;
202 }
203
204 read_extent_buffer(eb, buf, btrfs_item_ptr_offset(eb, 2),
205 strlen(split2));
206 if (memcmp(buf, split2, strlen(split2))) {
207 test_err(
208 "data in the buffer doesn't match what it should in the last chunk");
209 ret = -EINVAL;
210 goto out;
211 }
212 out:
213 btrfs_free_path(path);
214 btrfs_free_dummy_root(root);
215 btrfs_free_dummy_fs_info(fs_info);
216 return ret;
217 }
218
219 int btrfs_test_extent_buffer_operations(u32 sectorsize, u32 nodesize)
220 {
221 test_msg("running extent buffer operation tests");
222 return test_btrfs_split_item(sectorsize, nodesize);
223 }
224
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