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authorDavid Gow <davidgow@google.com>2021-04-15 23:56:23 -0700
committerShuah Khan <skhan@linuxfoundation.org>2021-08-13 13:13:18 -0600
commitb0d4adaf3b3c4402d9c3b6186e02aa1e4f7985cd (patch)
treec1e97a559f9c54c3e33e887b23f8a774a38690fa /fs/fat/fat_test.c
parent2734d6c1b1a089fb593ef6a23d4b70903526fe0c (diff)
fat: Add KUnit tests for checksums and timestamps
Add some basic sanity-check tests for the fat_checksum() function and the fat_time_unix2fat() and fat_time_fat2unix() functions. These unit tests verify these functions return correct output for a number of test inputs. These tests were inspired by -- and serve a similar purpose to -- the timestamp parsing KUnit tests in ext4[1]. Note that, unlike fat_time_unix2fat, fat_time_fat2unix wasn't previously exported, so this patch exports it as well. This is required for the case where we're building the fat and fat_test as modules. Fixed minor checkpatch coding style errors and typos in commit log: Shuah Khan <skhan@linuxfoundation.org> [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/ext4/inode-test.c Signed-off-by: David Gow <davidgow@google.com> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Reviewed-by: Brendan Higgins <brendanhiggins@google.com> Tested-by: Daniel Latypov <dlatypov@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Diffstat (limited to 'fs/fat/fat_test.c')
-rw-r--r--fs/fat/fat_test.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/fs/fat/fat_test.c b/fs/fat/fat_test.c
new file mode 100644
index 000000000000..2dab4ca1d0d8
--- /dev/null
+++ b/fs/fat/fat_test.c
@@ -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 "), (u8)44);
+ /* With 3-letter extension. */
+ KUNIT_EXPECT_EQ(test, fat_checksum("README TXT"), (u8)115);
+ /* With short (1-letter) extension. */
+ KUNIT_EXPECT_EQ(test, fat_checksum("ABCDEFGHA "), (u8)98);
+}
+
+struct fat_timestamp_testcase {
+ const char *name;
+ struct timespec64 ts;
+ __le16 time;
+ __le16 date;
+ u8 cs;
+ int time_offset;
+};
+
+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 = cpu_to_le16(0),
+ .date = cpu_to_le16(33),
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Latest possible UTC (2107-12-31 23:59:58)",
+ .ts = {.tv_sec = 4354819198LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(49021),
+ .date = cpu_to_le16(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 = cpu_to_le16(0),
+ .date = cpu_to_le16(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 = cpu_to_le16(49021),
+ .date = cpu_to_le16(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 = cpu_to_le16(0),
+ .date = cpu_to_le16(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 = cpu_to_le16(0),
+ .date = cpu_to_le16(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 = cpu_to_le16(0),
+ .date = cpu_to_le16(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 = cpu_to_le16(48064),
+ .date = cpu_to_le16(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 = cpu_to_le16(960),
+ .date = cpu_to_le16(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 = cpu_to_le16(49021),
+ .date = cpu_to_le16(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 = cpu_to_le16(0),
+ .date = cpu_to_le16(33),
+ .cs = 1,
+ .time_offset = 0,
+ },
+};
+
+static void time_testcase_desc(struct fat_timestamp_testcase *t,
+ char *desc)
+{
+ strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
+}
+
+KUNIT_ARRAY_PARAM(fat_time, time_test_cases, time_testcase_desc);
+
+static void fat_time_fat2unix_test(struct kunit *test)
+{
+ static struct msdos_sb_info fake_sb;
+ struct timespec64 ts;
+ struct fat_timestamp_testcase *testcase =
+ (struct fat_timestamp_testcase *)test->param_value;
+
+ fake_sb.options.tz_set = 1;
+ fake_sb.options.time_offset = testcase->time_offset;
+
+ fat_time_fat2unix(&fake_sb, &ts,
+ testcase->time,
+ testcase->date,
+ testcase->cs);
+ KUNIT_EXPECT_EQ_MSG(test,
+ testcase->ts.tv_sec,
+ ts.tv_sec,
+ "Timestamp mismatch (seconds)\n");
+ KUNIT_EXPECT_EQ_MSG(test,
+ testcase->ts.tv_nsec,
+ ts.tv_nsec,
+ "Timestamp mismatch (nanoseconds)\n");
+}
+
+static void fat_time_unix2fat_test(struct kunit *test)
+{
+ static struct msdos_sb_info fake_sb;
+ __le16 date, time;
+ u8 cs;
+ struct fat_timestamp_testcase *testcase =
+ (struct fat_timestamp_testcase *)test->param_value;
+
+ fake_sb.options.tz_set = 1;
+ fake_sb.options.time_offset = testcase->time_offset;
+
+ fat_time_unix2fat(&fake_sb, &testcase->ts,
+ &time, &date, &cs);
+ KUNIT_EXPECT_EQ_MSG(test,
+ le16_to_cpu(testcase->time),
+ le16_to_cpu(time),
+ "Time mismatch\n");
+ KUNIT_EXPECT_EQ_MSG(test,
+ le16_to_cpu(testcase->date),
+ le16_to_cpu(date),
+ "Date mismatch\n");
+ KUNIT_EXPECT_EQ_MSG(test,
+ testcase->cs,
+ cs,
+ "Centisecond mismatch\n");
+}
+
+static struct kunit_case fat_test_cases[] = {
+ KUNIT_CASE(fat_checksum_test),
+ KUNIT_CASE_PARAM(fat_time_fat2unix_test, fat_time_gen_params),
+ KUNIT_CASE_PARAM(fat_time_unix2fat_test, fat_time_gen_params),
+ {},
+};
+
+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");