@@ -115,3 +115,16 @@ config FAT_DEFAULT_UTF8
Say Y if you use UTF-8 encoding for file names, N otherwise.
See <file:Documentation/filesystems/vfat.rst> for more information.
+
+config FAT_KUNIT_TEST
+ tristate "Unit Tests for FAT filesystems" if !KUNIT_ALL_TESTS
+ select FAT_FS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This builds the FAT KUnit tests
+
+ For more information on KUnit and unit tests in general, please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit
+
+ If unsure, say N
@@ -10,3 +10,5 @@ obj-$(CONFIG_MSDOS_FS) += msdos.o
fat-y := cache.o dir.o fatent.o file.o inode.o misc.o nfs.o
vfat-y := namei_vfat.o
msdos-y := namei_msdos.o
+
+obj-$(CONFIG_FAT_KUNIT_TEST) += fat_test.o
new file mode 100644
@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit tests for FAT filesystems.
+ *
+ * Copyright (C) 2020 Google LLC.
+ * Author: David Gow <davidgow@google.com>
+ */
+
+#include <kunit/test.h>
+
+#include "fat.h"
+
+static void fat_checksum_test(struct kunit *test)
+{
+ /* With no extension. */
+ KUNIT_EXPECT_EQ(test, fat_checksum("VMLINUX "), 44);
+ /* With 3-letter extension. */
+ KUNIT_EXPECT_EQ(test, fat_checksum("README TXT"), 115);
+ /* With short (1-letter) extension. */
+ KUNIT_EXPECT_EQ(test, fat_checksum("ABCDEFGHA "), 98);
+}
+
+
+struct fat_timestamp_testcase {
+ const char *name;
+ struct timespec64 ts;
+ __le16 time;
+ __le16 date;
+ u8 cs;
+ int time_offset;
+};
+
+const static struct fat_timestamp_testcase time_test_cases[] = {
+ {
+ .name = "Earliest possible UTC (1980-01-01 00:00:00)",
+ .ts = {.tv_sec = 315532800LL, .tv_nsec = 0L},
+ .time = 0,
+ .date = 33,
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Latest possible UTC (2107-12-31 23:59:58)",
+ .ts = {.tv_sec = 4354819198LL, .tv_nsec = 0L},
+ .time = 49021,
+ .date = 65439,
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Earliest possible (UTC-11) (== 1979-12-31 13:00:00 UTC)",
+ .ts = {.tv_sec = 315493200LL, .tv_nsec = 0L},
+ .time = 0,
+ .date = 33,
+ .cs = 0,
+ .time_offset = 11 * 60,
+ },
+ {
+ .name = "Latest possible (UTC+11) (== 2108-01-01 10:59:58 UTC)",
+ .ts = {.tv_sec = 4354858798LL, .tv_nsec = 0L},
+ .time = 49021,
+ .date = 65439,
+ .cs = 0,
+ .time_offset = -11 * 60,
+ },
+ {
+ .name = "Leap Day / Year (1996-02-29 00:00:00)",
+ .ts = {.tv_sec = 825552000LL, .tv_nsec = 0L},
+ .time = 0,
+ .date = 8285,
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Year 2000 is leap year (2000-02-29 00:00:00)",
+ .ts = {.tv_sec = 951782400LL, .tv_nsec = 0L},
+ .time = 0,
+ .date = 10333,
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Year 2100 not leap year (2100-03-01 00:00:00)",
+ .ts = {.tv_sec = 4107542400LL, .tv_nsec = 0L},
+ .time = 0,
+ .date = 61537,
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Leap year + timezone UTC+1 (== 2004-02-29 00:30:00 UTC)",
+ .ts = {.tv_sec = 1078014600LL, .tv_nsec = 0L},
+ .time = 48064,
+ .date = 12380,
+ .cs = 0,
+ .time_offset = -60,
+ },
+ {
+ .name = "Leap year + timezone UTC-1 (== 2004-02-29 23:30:00 UTC)",
+ .ts = {.tv_sec = 1078097400LL, .tv_nsec = 0L},
+ .time = 960,
+ .date = 12385,
+ .cs = 0,
+ .time_offset = 60,
+ },
+ {
+ .name = "VFAT odd-second resolution (1999-12-31 23:59:59)",
+ .ts = {.tv_sec = 946684799LL, .tv_nsec = 0L},
+ .time = 49021,
+ .date = 10143,
+ .cs = 100,
+ .time_offset = 0,
+ },
+ {
+ .name = "VFAT 10ms resolution (1980-01-01 00:00:00:0010)",
+ .ts = {.tv_sec = 315532800LL, .tv_nsec = 10000000L},
+ .time = 0,
+ .date = 33,
+ .cs = 1,
+ .time_offset = 0,
+ },
+};
+
+static void fat_time_fat2unix_test(struct kunit *test)
+{
+ struct msdos_sb_info fake_sb;
+ int i;
+ struct timespec64 ts;
+
+ for (i = 0; i < ARRAY_SIZE(time_test_cases); ++i) {
+ fake_sb.options.tz_set = 1;
+ fake_sb.options.time_offset = time_test_cases[i].time_offset;
+
+ fat_time_fat2unix(&fake_sb, &ts,
+ time_test_cases[i].time,
+ time_test_cases[i].date,
+ time_test_cases[i].cs);
+ KUNIT_EXPECT_EQ_MSG(test,
+ time_test_cases[i].ts.tv_sec,
+ ts.tv_sec,
+ "Timestamp mismatch (seconds) in case \"%s\"\n",
+ time_test_cases[i].name);
+ KUNIT_EXPECT_EQ_MSG(test,
+ time_test_cases[i].ts.tv_nsec,
+ ts.tv_nsec,
+ "Timestamp mismatch (nanoseconds) in case \"%s\"\n",
+ time_test_cases[i].name);
+ }
+}
+
+static void fat_time_unix2fat_test(struct kunit *test)
+{
+ struct msdos_sb_info fake_sb;
+ int i;
+ __le16 date, time;
+ u8 cs;
+
+ for (i = 0; i < ARRAY_SIZE(time_test_cases); ++i) {
+ fake_sb.options.tz_set = 1;
+ fake_sb.options.time_offset = time_test_cases[i].time_offset;
+
+ fat_time_unix2fat(&fake_sb, &time_test_cases[i].ts,
+ &time, &date, &cs);
+ KUNIT_EXPECT_EQ_MSG(test,
+ time_test_cases[i].time,
+ time,
+ "Time mismatch in case \"%s\"\n",
+ time_test_cases[i].name);
+ KUNIT_EXPECT_EQ_MSG(test,
+ time_test_cases[i].date,
+ date,
+ "Date mismatch in case \"%s\"\n",
+ time_test_cases[i].name);
+ KUNIT_EXPECT_EQ_MSG(test,
+ time_test_cases[i].cs,
+ cs,
+ "Centisecond mismatch in case \"%s\"\n",
+ time_test_cases[i].name);
+ }
+}
+
+static struct kunit_case fat_test_cases[] = {
+ KUNIT_CASE(fat_checksum_test),
+ KUNIT_CASE(fat_time_fat2unix_test),
+ KUNIT_CASE(fat_time_unix2fat_test),
+ {},
+};
+
+static struct kunit_suite fat_test_suite = {
+ .name = "fat_test",
+ .test_cases = fat_test_cases,
+};
+
+kunit_test_suites(&fat_test_suite);
+
+MODULE_LICENSE("GPL v2");
@@ -229,6 +229,8 @@ void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec64 *ts,
ts->tv_nsec = 0;
}
}
+/* Export fat_time_fat2unix() for the fat_test KUnit tests. */
+EXPORT_SYMBOL_GPL(fat_time_fat2unix);
/* Convert linear UNIX date to a FAT time/date pair. */
void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec64 *ts,