1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * KUnit tests for FAT filesystems.
4 *
5 * Copyright (C) 2020 Google LLC.
6 * Author: David Gow <davidgow@google.com>
7 */
8
9 #include <kunit/test.h>
10
11 #include "fat.h"
12
13 static void fat_checksum_test(struct kunit *test)
14 {
15 /* With no extension. */
16 KUNIT_EXPECT_EQ(test, fat_checksum("VMLINUX "), (u8)44);
17 /* With 3-letter extension. */
18 KUNIT_EXPECT_EQ(test, fat_checksum("README TXT"), (u8)115);
19 /* With short (1-letter) extension. */
20 KUNIT_EXPECT_EQ(test, fat_checksum("ABCDEFGHA "), (u8)98);
21 }
22
23 struct fat_timestamp_testcase {
24 const char *name;
25 struct timespec64 ts;
26 __le16 time;
27 __le16 date;
28 u8 cs;
29 int time_offset;
30 };
31
32 static struct fat_timestamp_testcase time_test_cases[] = {
33 {
34 .name = "Earliest possible UTC (1980-01-01 00:00:00)",
35 .ts = {.tv_sec = 315532800LL, .tv_nsec = 0L},
36 .time = cpu_to_le16(0),
37 .date = cpu_to_le16(33),
38 .cs = 0,
39 .time_offset = 0,
40 },
41 {
42 .name = "Latest possible UTC (2107-12-31 23:59:58)",
43 .ts = {.tv_sec = 4354819198LL, .tv_nsec = 0L},
44 .time = cpu_to_le16(49021),
45 .date = cpu_to_le16(65439),
46 .cs = 0,
47 .time_offset = 0,
48 },
49 {
50 .name = "Earliest possible (UTC-11) (== 1979-12-31 13:00:00 UTC)",
51 .ts = {.tv_sec = 315493200LL, .tv_nsec = 0L},
52 .time = cpu_to_le16(0),
53 .date = cpu_to_le16(33),
54 .cs = 0,
55 .time_offset = 11 * 60,
56 },
57 {
58 .name = "Latest possible (UTC+11) (== 2108-01-01 10:59:58 UTC)",
59 .ts = {.tv_sec = 4354858798LL, .tv_nsec = 0L},
60 .time = cpu_to_le16(49021),
61 .date = cpu_to_le16(65439),
62 .cs = 0,
63 .time_offset = -11 * 60,
64 },
65 {
66 .name = "Leap Day / Year (1996-02-29 00:00:00)",
67 .ts = {.tv_sec = 825552000LL, .tv_nsec = 0L},
68 .time = cpu_to_le16(0),
69 .date = cpu_to_le16(8285),
70 .cs = 0,
71 .time_offset = 0,
72 },
73 {
74 .name = "Year 2000 is leap year (2000-02-29 00:00:00)",
75 .ts = {.tv_sec = 951782400LL, .tv_nsec = 0L},
76 .time = cpu_to_le16(0),
77 .date = cpu_to_le16(10333),
78 .cs = 0,
79 .time_offset = 0,
80 },
81 {
82 .name = "Year 2100 not leap year (2100-03-01 00:00:00)",
83 .ts = {.tv_sec = 4107542400LL, .tv_nsec = 0L},
84 .time = cpu_to_le16(0),
85 .date = cpu_to_le16(61537),
86 .cs = 0,
87 .time_offset = 0,
88 },
89 {
90 .name = "Leap year + timezone UTC+1 (== 2004-02-29 00:30:00 UTC)",
91 .ts = {.tv_sec = 1078014600LL, .tv_nsec = 0L},
92 .time = cpu_to_le16(48064),
93 .date = cpu_to_le16(12380),
94 .cs = 0,
95 .time_offset = -60,
96 },
97 {
98 .name = "Leap year + timezone UTC-1 (== 2004-02-29 23:30:00 UTC)",
99 .ts = {.tv_sec = 1078097400LL, .tv_nsec = 0L},
100 .time = cpu_to_le16(960),
101 .date = cpu_to_le16(12385),
102 .cs = 0,
103 .time_offset = 60,
104 },
105 {
106 .name = "VFAT odd-second resolution (1999-12-31 23:59:59)",
107 .ts = {.tv_sec = 946684799LL, .tv_nsec = 0L},
108 .time = cpu_to_le16(49021),
109 .date = cpu_to_le16(10143),
110 .cs = 100,
111 .time_offset = 0,
112 },
113 {
114 .name = "VFAT 10ms resolution (1980-01-01 00:00:00:0010)",
115 .ts = {.tv_sec = 315532800LL, .tv_nsec = 10000000L},
116 .time = cpu_to_le16(0),
117 .date = cpu_to_le16(33),
118 .cs = 1,
119 .time_offset = 0,
120 },
121 };
122
123 static void time_testcase_desc(struct fat_timestamp_testcase *t,
124 char *desc)
125 {
126 strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
127 }
128
129 KUNIT_ARRAY_PARAM(fat_time, time_test_cases, time_testcase_desc);
130
131 static void fat_time_fat2unix_test(struct kunit *test)
132 {
133 static struct msdos_sb_info fake_sb;
134 struct timespec64 ts;
135 struct fat_timestamp_testcase *testcase =
136 (struct fat_timestamp_testcase *)test->param_value;
137
138 fake_sb.options.tz_set = 1;
139 fake_sb.options.time_offset = testcase->time_offset;
140
141 fat_time_fat2unix(&fake_sb, &ts,
142 testcase->time,
143 testcase->date,
144 testcase->cs);
145 KUNIT_EXPECT_EQ_MSG(test,
146 testcase->ts.tv_sec,
147 ts.tv_sec,
148 "Timestamp mismatch (seconds)\n");
149 KUNIT_EXPECT_EQ_MSG(test,
150 testcase->ts.tv_nsec,
151 ts.tv_nsec,
152 "Timestamp mismatch (nanoseconds)\n");
153 }
154
155 static void fat_time_unix2fat_test(struct kunit *test)
156 {
157 static struct msdos_sb_info fake_sb;
158 __le16 date, time;
159 u8 cs;
160 struct fat_timestamp_testcase *testcase =
161 (struct fat_timestamp_testcase *)test->param_value;
162
163 fake_sb.options.tz_set = 1;
164 fake_sb.options.time_offset = testcase->time_offset;
165
166 fat_time_unix2fat(&fake_sb, &testcase->ts,
167 &time, &date, &cs);
168 KUNIT_EXPECT_EQ_MSG(test,
169 le16_to_cpu(testcase->time),
170 le16_to_cpu(time),
171 "Time mismatch\n");
172 KUNIT_EXPECT_EQ_MSG(test,
173 le16_to_cpu(testcase->date),
174 le16_to_cpu(date),
175 "Date mismatch\n");
176 KUNIT_EXPECT_EQ_MSG(test,
177 testcase->cs,
178 cs,
179 "Centisecond mismatch\n");
180 }
181
182 static struct kunit_case fat_test_cases[] = {
183 KUNIT_CASE(fat_checksum_test),
184 KUNIT_CASE_PARAM(fat_time_fat2unix_test, fat_time_gen_params),
185 KUNIT_CASE_PARAM(fat_time_unix2fat_test, fat_time_gen_params),
186 {},
187 };
188
189 static struct kunit_suite fat_test_suite = {
190 .name = "fat_test",
191 .test_cases = fat_test_cases,
192 };
193
194 kunit_test_suites(&fat_test_suite);
195
196 MODULE_DESCRIPTION("KUnit tests for FAT filesystems");
197 MODULE_LICENSE("GPL v2");
198
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.