perf data: Add is_perf_data function
[linux-2.6-microblaze.git] / fs / ext4 / inode-test.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * KUnit test of ext4 inode that verify the seconds part of [a/c/m]
4  * timestamps in ext4 inode structs are decoded correctly.
5  */
6
7 #include <kunit/test.h>
8 #include <linux/kernel.h>
9 #include <linux/time64.h>
10
11 #include "ext4.h"
12
13 /*
14  * For constructing the nonnegative timestamp lower bound value.
15  * binary: 00000000 00000000 00000000 00000000
16  */
17 #define LOWER_MSB_0 0L
18 /*
19  * For constructing the nonnegative timestamp upper bound value.
20  * binary: 01111111 11111111 11111111 11111111
21  *
22  */
23 #define UPPER_MSB_0 0x7fffffffL
24 /*
25  * For constructing the negative timestamp lower bound value.
26  * binary: 10000000 00000000 00000000 00000000
27  */
28 #define LOWER_MSB_1 (-(UPPER_MSB_0) - 1L)  /* avoid overflow */
29 /*
30  * For constructing the negative timestamp upper bound value.
31  * binary: 11111111 11111111 11111111 11111111
32  */
33 #define UPPER_MSB_1 (-1L)
34 /*
35  * Upper bound for nanoseconds value supported by the encoding.
36  * binary: 00111111 11111111 11111111 11111111
37  */
38 #define MAX_NANOSECONDS ((1L << 30) - 1)
39
40 #define CASE_NAME_FORMAT "%s: msb:%x lower_bound:%x extra_bits: %x"
41
42 #define LOWER_BOUND_NEG_NO_EXTRA_BITS_CASE\
43         "1901-12-13 Lower bound of 32bit < 0 timestamp, no extra bits"
44 #define UPPER_BOUND_NEG_NO_EXTRA_BITS_CASE\
45         "1969-12-31 Upper bound of 32bit < 0 timestamp, no extra bits"
46 #define LOWER_BOUND_NONNEG_NO_EXTRA_BITS_CASE\
47         "1970-01-01 Lower bound of 32bit >=0 timestamp, no extra bits"
48 #define UPPER_BOUND_NONNEG_NO_EXTRA_BITS_CASE\
49         "2038-01-19 Upper bound of 32bit >=0 timestamp, no extra bits"
50 #define LOWER_BOUND_NEG_LO_1_CASE\
51         "2038-01-19 Lower bound of 32bit <0 timestamp, lo extra sec bit on"
52 #define UPPER_BOUND_NEG_LO_1_CASE\
53         "2106-02-07 Upper bound of 32bit <0 timestamp, lo extra sec bit on"
54 #define LOWER_BOUND_NONNEG_LO_1_CASE\
55         "2106-02-07 Lower bound of 32bit >=0 timestamp, lo extra sec bit on"
56 #define UPPER_BOUND_NONNEG_LO_1_CASE\
57         "2174-02-25 Upper bound of 32bit >=0 timestamp, lo extra sec bit on"
58 #define LOWER_BOUND_NEG_HI_1_CASE\
59         "2174-02-25 Lower bound of 32bit <0 timestamp, hi extra sec bit on"
60 #define UPPER_BOUND_NEG_HI_1_CASE\
61         "2242-03-16 Upper bound of 32bit <0 timestamp, hi extra sec bit on"
62 #define LOWER_BOUND_NONNEG_HI_1_CASE\
63         "2242-03-16 Lower bound of 32bit >=0 timestamp, hi extra sec bit on"
64 #define UPPER_BOUND_NONNEG_HI_1_CASE\
65         "2310-04-04 Upper bound of 32bit >=0 timestamp, hi extra sec bit on"
66 #define UPPER_BOUND_NONNEG_HI_1_NS_1_CASE\
67         "2310-04-04 Upper bound of 32bit>=0 timestamp, hi extra sec bit 1. 1 ns"
68 #define LOWER_BOUND_NONNEG_HI_1_NS_MAX_CASE\
69         "2378-04-22 Lower bound of 32bit>= timestamp. Extra sec bits 1. Max ns"
70 #define LOWER_BOUND_NONNEG_EXTRA_BITS_1_CASE\
71         "2378-04-22 Lower bound of 32bit >=0 timestamp. All extra sec bits on"
72 #define UPPER_BOUND_NONNEG_EXTRA_BITS_1_CASE\
73         "2446-05-10 Upper bound of 32bit >=0 timestamp. All extra sec bits on"
74
75 struct timestamp_expectation {
76         const char *test_case_name;
77         struct timespec64 expected;
78         u32 extra_bits;
79         bool msb_set;
80         bool lower_bound;
81 };
82
83 static time64_t get_32bit_time(const struct timestamp_expectation * const test)
84 {
85         if (test->msb_set) {
86                 if (test->lower_bound)
87                         return LOWER_MSB_1;
88
89                 return UPPER_MSB_1;
90         }
91
92         if (test->lower_bound)
93                 return LOWER_MSB_0;
94         return UPPER_MSB_0;
95 }
96
97
98 /*
99  *  Test data is derived from the table in the Inode Timestamps section of
100  *  Documentation/filesystems/ext4/inodes.rst.
101  */
102 static void inode_test_xtimestamp_decoding(struct kunit *test)
103 {
104         const struct timestamp_expectation test_data[] = {
105                 {
106                         .test_case_name = LOWER_BOUND_NEG_NO_EXTRA_BITS_CASE,
107                         .msb_set = true,
108                         .lower_bound = true,
109                         .extra_bits = 0,
110                         .expected = {.tv_sec = -0x80000000LL, .tv_nsec = 0L},
111                 },
112
113                 {
114                         .test_case_name = UPPER_BOUND_NEG_NO_EXTRA_BITS_CASE,
115                         .msb_set = true,
116                         .lower_bound = false,
117                         .extra_bits = 0,
118                         .expected = {.tv_sec = -1LL, .tv_nsec = 0L},
119                 },
120
121                 {
122                         .test_case_name = LOWER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,
123                         .msb_set = false,
124                         .lower_bound = true,
125                         .extra_bits = 0,
126                         .expected = {0LL, 0L},
127                 },
128
129                 {
130                         .test_case_name = UPPER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,
131                         .msb_set = false,
132                         .lower_bound = false,
133                         .extra_bits = 0,
134                         .expected = {.tv_sec = 0x7fffffffLL, .tv_nsec = 0L},
135                 },
136
137                 {
138                         .test_case_name = LOWER_BOUND_NEG_LO_1_CASE,
139                         .msb_set = true,
140                         .lower_bound = true,
141                         .extra_bits = 1,
142                         .expected = {.tv_sec = 0x80000000LL, .tv_nsec = 0L},
143                 },
144
145                 {
146                         .test_case_name = UPPER_BOUND_NEG_LO_1_CASE,
147                         .msb_set = true,
148                         .lower_bound = false,
149                         .extra_bits = 1,
150                         .expected = {.tv_sec = 0xffffffffLL, .tv_nsec = 0L},
151                 },
152
153                 {
154                         .test_case_name = LOWER_BOUND_NONNEG_LO_1_CASE,
155                         .msb_set = false,
156                         .lower_bound = true,
157                         .extra_bits = 1,
158                         .expected = {.tv_sec = 0x100000000LL, .tv_nsec = 0L},
159                 },
160
161                 {
162                         .test_case_name = UPPER_BOUND_NONNEG_LO_1_CASE,
163                         .msb_set = false,
164                         .lower_bound = false,
165                         .extra_bits = 1,
166                         .expected = {.tv_sec = 0x17fffffffLL, .tv_nsec = 0L},
167                 },
168
169                 {
170                         .test_case_name = LOWER_BOUND_NEG_HI_1_CASE,
171                         .msb_set = true,
172                         .lower_bound = true,
173                         .extra_bits =  2,
174                         .expected = {.tv_sec = 0x180000000LL, .tv_nsec = 0L},
175                 },
176
177                 {
178                         .test_case_name = UPPER_BOUND_NEG_HI_1_CASE,
179                         .msb_set = true,
180                         .lower_bound = false,
181                         .extra_bits = 2,
182                         .expected = {.tv_sec = 0x1ffffffffLL, .tv_nsec = 0L},
183                 },
184
185                 {
186                         .test_case_name = LOWER_BOUND_NONNEG_HI_1_CASE,
187                         .msb_set = false,
188                         .lower_bound = true,
189                         .extra_bits = 2,
190                         .expected = {.tv_sec = 0x200000000LL, .tv_nsec = 0L},
191                 },
192
193                 {
194                         .test_case_name = UPPER_BOUND_NONNEG_HI_1_CASE,
195                         .msb_set = false,
196                         .lower_bound = false,
197                         .extra_bits = 2,
198                         .expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 0L},
199                 },
200
201                 {
202                         .test_case_name = UPPER_BOUND_NONNEG_HI_1_NS_1_CASE,
203                         .msb_set = false,
204                         .lower_bound = false,
205                         .extra_bits = 6,
206                         .expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 1L},
207                 },
208
209                 {
210                         .test_case_name = LOWER_BOUND_NONNEG_HI_1_NS_MAX_CASE,
211                         .msb_set = false,
212                         .lower_bound = true,
213                         .extra_bits = 0xFFFFFFFF,
214                         .expected = {.tv_sec = 0x300000000LL,
215                                      .tv_nsec = MAX_NANOSECONDS},
216                 },
217
218                 {
219                         .test_case_name = LOWER_BOUND_NONNEG_EXTRA_BITS_1_CASE,
220                         .msb_set = false,
221                         .lower_bound = true,
222                         .extra_bits = 3,
223                         .expected = {.tv_sec = 0x300000000LL, .tv_nsec = 0L},
224                 },
225
226                 {
227                         .test_case_name = UPPER_BOUND_NONNEG_EXTRA_BITS_1_CASE,
228                         .msb_set = false,
229                         .lower_bound = false,
230                         .extra_bits = 3,
231                         .expected = {.tv_sec = 0x37fffffffLL, .tv_nsec = 0L},
232                 }
233         };
234
235         struct timespec64 timestamp;
236         int i;
237
238         for (i = 0; i < ARRAY_SIZE(test_data); ++i) {
239                 timestamp.tv_sec = get_32bit_time(&test_data[i]);
240                 ext4_decode_extra_time(&timestamp,
241                                        cpu_to_le32(test_data[i].extra_bits));
242
243                 KUNIT_EXPECT_EQ_MSG(test,
244                                     test_data[i].expected.tv_sec,
245                                     timestamp.tv_sec,
246                                     CASE_NAME_FORMAT,
247                                     test_data[i].test_case_name,
248                                     test_data[i].msb_set,
249                                     test_data[i].lower_bound,
250                                     test_data[i].extra_bits);
251                 KUNIT_EXPECT_EQ_MSG(test,
252                                     test_data[i].expected.tv_nsec,
253                                     timestamp.tv_nsec,
254                                     CASE_NAME_FORMAT,
255                                     test_data[i].test_case_name,
256                                     test_data[i].msb_set,
257                                     test_data[i].lower_bound,
258                                     test_data[i].extra_bits);
259         }
260 }
261
262 static struct kunit_case ext4_inode_test_cases[] = {
263         KUNIT_CASE(inode_test_xtimestamp_decoding),
264         {}
265 };
266
267 static struct kunit_suite ext4_inode_test_suite = {
268         .name = "ext4_inode_test",
269         .test_cases = ext4_inode_test_cases,
270 };
271
272 kunit_test_suites(&ext4_inode_test_suite);
273
274 MODULE_LICENSE("GPL v2");