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Fri, 09 Oct 2026 14:31:55 -0700 (PDT) From: Viacheslav Dubeyko To: glaubitz@physik.fu-berlin.de, frank.li@vivo.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, vdubeyko@coreweave.com, Viacheslav Dubeyko Subject: [PATCH v2 3/3] hfsplus: add KUnit tests for date/time conversion Date: Fri, 9 Oct 2026 14:31:32 -0700 Message-ID: <20261009213132.997851-4-slava@dubeyko.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261009213132.997851-1-slava@dubeyko.com> References: <20261009213132.997851-1-slava@dubeyko.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add the hfsplus_time KUnit test suite that checks the date/time conversion logic and the extended timestamp support: (1) hfsplus_time_constants_test: the supported time range and HFSPLUS_EXT_TIMESTAMP_MARK value; (2) hfsplus_mt2ut_test, hfsplus_ut2mt_test: conversion of the known dates (1904, 1970, 2000, 2026, 2038, 2040); (3) hfsplus_ut2mt_before_1970_test: timestamps before January 1, 1970 (xfstests generic/258 issue); (4) hfsplus_ut2mt_clamp_test: out-of-range timestamps are clamped instead of wrapped; (5) hfsplus_time_roundtrip_test: representable timestamps survive the round trip; (6) hfsplus_ut_needs_xattr_test, hfsplus_mt_is_ext_timestamp_test: the decision to keep the timestamp in xattr; (7) hfsplus_read_timestamp_regular_test, hfsplus_read_timestamp_mark_no_xattr_test: reading of the regular on-disk timestamp and HFSPLUS_EXT_TIMESTAMP_MARK without xattr; (8) hfsplus_timestamp_xattr_names_test: names of internal xattrs fit the name buffer. The hfsplus_read_timestamp() is exported by means of EXPORT_SYMBOL_IF_KUNIT(). ./tools/testing/kunit/kunit.py run --kunitconfig=fs/hfsplus/.kunitconfig [PASSED] hfsplus_time_constants_test [PASSED] hfsplus_mt2ut_test [PASSED] hfsplus_ut2mt_test [PASSED] hfsplus_ut2mt_before_1970_test [PASSED] hfsplus_ut2mt_clamp_test [PASSED] hfsplus_time_roundtrip_test [PASSED] hfsplus_ut_needs_xattr_test [PASSED] hfsplus_mt_is_ext_timestamp_test [PASSED] hfsplus_read_timestamp_regular_test [PASSED] hfsplus_read_timestamp_mark_no_xattr_test [PASSED] hfsplus_timestamp_xattr_names_test ================== [PASSED] hfsplus_time =================== Signed-off-by: Viacheslav Dubeyko cc: John Paul Adrian Glaubitz cc: Yangtao Li cc: linux-fsdevel@vger.kernel.org --- fs/hfsplus/Makefile | 2 +- fs/hfsplus/inode.c | 2 + fs/hfsplus/time_test.c | 354 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 357 insertions(+), 1 deletion(-) create mode 100644 fs/hfsplus/time_test.c diff --git a/fs/hfsplus/Makefile b/fs/hfsplus/Makefile index f2a9ae697e81..94a262ae9177 100644 --- a/fs/hfsplus/Makefile +++ b/fs/hfsplus/Makefile @@ -10,4 +10,4 @@ hfsplus-objs := super.o options.o inode.o ioctl.o extents.o catalog.o dir.o btre attributes.o xattr.o xattr_user.o xattr_security.o xattr_trusted.o # KUnit tests -obj-$(CONFIG_HFSPLUS_KUNIT_TEST) += unicode_test.o +obj-$(CONFIG_HFSPLUS_KUNIT_TEST) += unicode_test.o time_test.o diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c index c2ee1906589d..0df58dfda5a3 100644 --- a/fs/hfsplus/inode.c +++ b/fs/hfsplus/inode.c @@ -18,6 +18,7 @@ #include #include #include +#include #include "hfsplus_fs.h" #include "hfsplus_raw.h" @@ -648,6 +649,7 @@ int hfsplus_read_timestamp(struct super_block *sb, u32 cnid, return 0; } +EXPORT_SYMBOL_IF_KUNIT(hfsplus_read_timestamp); static int hfsplus_inode_read_timestamps(struct inode *inode, struct hfsplus_timestamps *timestamps) diff --git a/fs/hfsplus/time_test.c b/fs/hfsplus/time_test.c new file mode 100644 index 000000000000..4b3312dc0048 --- /dev/null +++ b/fs/hfsplus/time_test.c @@ -0,0 +1,354 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit tests for HFS+ date/time conversion + * + * Copyright (C) 2026 Viacheslav Dubeyko + */ + +#include +#include "hfsplus_fs.h" +#include "xattr.h" + +/* January 1, 1970, 00:00:00 UTC */ +#define TEST_UNIX_EPOCH_SECS 0LL +/* December 31, 1969, 23:59:59 UTC */ +#define TEST_BEFORE_UNIX_EPOCH_SECS -1LL +/* January 1, 2000, 00:00:00 UTC */ +#define TEST_Y2000_SECS 946684800LL +/* January 19, 2038, 03:14:08 UTC (signed 32-bit overflow) */ +#define TEST_Y2038_SECS 2147483648LL +/* January 1, 2026, 00:00:00 UTC */ +#define TEST_Y2026_SECS 1767225600LL +/* January 1, 2100, 00:00:00 UTC */ +#define TEST_Y2100_SECS 4102444800LL +/* January 1, 1900, 00:00:00 UTC */ +#define TEST_Y1900_SECS -2208988800LL + +static u32 mt_raw(__be32 mt) +{ + return be32_to_cpu(mt); +} + +/* Test the time range constants */ +static void hfsplus_time_constants_test(struct kunit *test) +{ + /* 32-bit unsigned on-disk field covers exactly U32_MAX seconds */ + KUNIT_EXPECT_EQ(test, (s64)U32_MAX, + HFS_MAX_TIMESTAMP_SECS - HFS_MIN_TIMESTAMP_SECS); + KUNIT_EXPECT_EQ(test, -(s64)HFS_UTC_OFFSET, HFS_MIN_TIMESTAMP_SECS); + + /* xattrs extend the supported range beyond February 2040 */ + KUNIT_EXPECT_GT(test, (s64)HFSPLUS_MAX_TIMESTAMP_SECS, + (s64)HFS_MAX_TIMESTAMP_SECS); + + /* the extended timestamp mark is the maximal on-disk value */ + KUNIT_EXPECT_EQ(test, U32_MAX, mt_raw(HFSPLUS_EXT_TIMESTAMP_MARK)); +} + +/* Test conversion of on-disk (1904-based) timestamp into 1970-based one */ +static void hfsplus_mt2ut_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, HFS_MIN_TIMESTAMP_SECS, + __hfsp_mt2ut(cpu_to_be32(0))); + KUNIT_EXPECT_EQ(test, TEST_UNIX_EPOCH_SECS, + __hfsp_mt2ut(cpu_to_be32(HFS_UTC_OFFSET))); + KUNIT_EXPECT_EQ(test, TEST_BEFORE_UNIX_EPOCH_SECS, + __hfsp_mt2ut(cpu_to_be32(HFS_UTC_OFFSET - 1))); + KUNIT_EXPECT_EQ(test, TEST_Y2000_SECS, + __hfsp_mt2ut(cpu_to_be32(3029529600U))); + KUNIT_EXPECT_EQ(test, TEST_Y2026_SECS, + __hfsp_mt2ut(cpu_to_be32(3850070400U))); + KUNIT_EXPECT_EQ(test, TEST_Y2038_SECS, + __hfsp_mt2ut(cpu_to_be32(4230328448U))); + KUNIT_EXPECT_EQ(test, HFS_MAX_TIMESTAMP_SECS, + __hfsp_mt2ut(cpu_to_be32(U32_MAX))); + KUNIT_EXPECT_EQ(test, HFS_MAX_TIMESTAMP_SECS, + __hfsp_mt2ut(HFSPLUS_EXT_TIMESTAMP_MARK)); +} + +/* Test conversion of 1970-based timestamp into on-disk (1904-based) one */ +static void hfsplus_ut2mt_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, 0U, + mt_raw(__hfsp_ut2mt(HFS_MIN_TIMESTAMP_SECS))); + KUNIT_EXPECT_EQ(test, HFS_UTC_OFFSET, + mt_raw(__hfsp_ut2mt(TEST_UNIX_EPOCH_SECS))); + KUNIT_EXPECT_EQ(test, 3029529600U, + mt_raw(__hfsp_ut2mt(TEST_Y2000_SECS))); + KUNIT_EXPECT_EQ(test, 3850070400U, + mt_raw(__hfsp_ut2mt(TEST_Y2026_SECS))); + KUNIT_EXPECT_EQ(test, 4230328448U, + mt_raw(__hfsp_ut2mt(TEST_Y2038_SECS))); + KUNIT_EXPECT_EQ(test, U32_MAX - 1, + mt_raw(__hfsp_ut2mt(HFS_MAX_TIMESTAMP_SECS - 1))); + KUNIT_EXPECT_EQ(test, U32_MAX, + mt_raw(__hfsp_ut2mt(HFS_MAX_TIMESTAMP_SECS))); +} + +/* + * Test timestamps before January 1, 1970 (xfstests generic/258). + * The old logic added HFS_UTC_OFFSET to lower 32 bits of negative + * value and produced completely wrong result. + */ +static void hfsplus_ut2mt_before_1970_test(struct kunit *test) +{ + time64_t ut; + + KUNIT_EXPECT_EQ(test, HFS_UTC_OFFSET - 1, + mt_raw(__hfsp_ut2mt(TEST_BEFORE_UNIX_EPOCH_SECS))); + + /* January 1, 1960, 00:00:00 UTC */ + ut = -315619200LL; + KUNIT_EXPECT_EQ(test, ut, __hfsp_mt2ut(__hfsp_ut2mt(ut))); + + /* January 1, 1904, 00:00:01 UTC */ + ut = HFS_MIN_TIMESTAMP_SECS + 1; + KUNIT_EXPECT_EQ(test, 1U, mt_raw(__hfsp_ut2mt(ut))); + KUNIT_EXPECT_EQ(test, ut, __hfsp_mt2ut(__hfsp_ut2mt(ut))); +} + +/* Test that out-of-range timestamps are clamped instead of wrapped */ +static void hfsplus_ut2mt_clamp_test(struct kunit *test) +{ + /* below January 1, 1904 */ + KUNIT_EXPECT_EQ(test, 0U, + mt_raw(__hfsp_ut2mt(HFS_MIN_TIMESTAMP_SECS - 1))); + KUNIT_EXPECT_EQ(test, 0U, + mt_raw(__hfsp_ut2mt(TEST_Y1900_SECS))); + KUNIT_EXPECT_EQ(test, 0U, + mt_raw(__hfsp_ut2mt(TIME64_MIN))); + + /* after February 6, 2040 */ + KUNIT_EXPECT_EQ(test, U32_MAX, + mt_raw(__hfsp_ut2mt(HFS_MAX_TIMESTAMP_SECS + 1))); + KUNIT_EXPECT_EQ(test, U32_MAX, + mt_raw(__hfsp_ut2mt(TEST_Y2100_SECS))); + KUNIT_EXPECT_EQ(test, U32_MAX, + mt_raw(__hfsp_ut2mt(HFSPLUS_MAX_TIMESTAMP_SECS))); + + /* lower 32 bits of these values would wrap into small dates */ + KUNIT_EXPECT_EQ(test, U32_MAX, + mt_raw(__hfsp_ut2mt(HFS_MAX_TIMESTAMP_SECS + + (s64)U32_MAX + 1))); + KUNIT_EXPECT_EQ(test, U32_MAX, + mt_raw(__hfsp_ut2mt(1LL << 32))); +} + +/* Test that representable timestamps survive the round trip */ +static void hfsplus_time_roundtrip_test(struct kunit *test) +{ + static const time64_t values[] = { + HFS_MIN_TIMESTAMP_SECS, + HFS_MIN_TIMESTAMP_SECS + 1, + TEST_BEFORE_UNIX_EPOCH_SECS, + TEST_UNIX_EPOCH_SECS, + 1, + TEST_Y2000_SECS, + TEST_Y2026_SECS, + (s64)S32_MAX, + TEST_Y2038_SECS, + HFS_MAX_TIMESTAMP_SECS - 1, + HFS_MAX_TIMESTAMP_SECS, + }; + time64_t ut; + int i; + + for (i = 0; i < ARRAY_SIZE(values); i++) { + KUNIT_EXPECT_EQ_MSG(test, values[i], + __hfsp_mt2ut(__hfsp_ut2mt(values[i])), + "round trip failed: index %d", i); + } + + /* sweep the whole range with a large prime step */ + for (ut = HFS_MIN_TIMESTAMP_SECS; ut <= HFS_MAX_TIMESTAMP_SECS; + ut += 999983) { + if (__hfsp_mt2ut(__hfsp_ut2mt(ut)) != ut) { + KUNIT_FAIL(test, "round trip failed: ut %lld", ut); + break; + } + } + + /* every on-disk value maps back to itself */ + for (i = 0; i < 32; i++) { + u32 raw = (u32)BIT_ULL(i); + + KUNIT_EXPECT_EQ(test, raw, + mt_raw(__hfsp_ut2mt(__hfsp_mt2ut(cpu_to_be32(raw))))); + } +} + +/* Test the decision to keep timestamp in xattr */ +static void hfsplus_ut_needs_xattr_test(struct kunit *test) +{ + KUNIT_EXPECT_FALSE(test, hfsp_ut_needs_xattr(HFS_MIN_TIMESTAMP_SECS)); + KUNIT_EXPECT_FALSE(test, hfsp_ut_needs_xattr(TEST_BEFORE_UNIX_EPOCH_SECS)); + KUNIT_EXPECT_FALSE(test, hfsp_ut_needs_xattr(TEST_UNIX_EPOCH_SECS)); + KUNIT_EXPECT_FALSE(test, hfsp_ut_needs_xattr(TEST_Y2026_SECS)); + KUNIT_EXPECT_FALSE(test, hfsp_ut_needs_xattr(TEST_Y2038_SECS)); + KUNIT_EXPECT_FALSE(test, + hfsp_ut_needs_xattr(HFS_MAX_TIMESTAMP_SECS - 1)); + + KUNIT_EXPECT_TRUE(test, hfsp_ut_needs_xattr(HFS_MAX_TIMESTAMP_SECS)); + KUNIT_EXPECT_TRUE(test, + hfsp_ut_needs_xattr(HFS_MAX_TIMESTAMP_SECS + 1)); + KUNIT_EXPECT_TRUE(test, hfsp_ut_needs_xattr(TEST_Y2100_SECS)); + KUNIT_EXPECT_TRUE(test, + hfsp_ut_needs_xattr(HFSPLUS_MAX_TIMESTAMP_SECS)); +} + +/* Test detection of the extended timestamp mark */ +static void hfsplus_mt_is_ext_timestamp_test(struct kunit *test) +{ + KUNIT_EXPECT_TRUE(test, + hfsp_mt_is_ext_timestamp(HFSPLUS_EXT_TIMESTAMP_MARK)); + KUNIT_EXPECT_TRUE(test, + hfsp_mt_is_ext_timestamp(cpu_to_be32(U32_MAX))); + + KUNIT_EXPECT_FALSE(test, hfsp_mt_is_ext_timestamp(cpu_to_be32(0))); + KUNIT_EXPECT_FALSE(test, + hfsp_mt_is_ext_timestamp(cpu_to_be32(U32_MAX - 1))); + KUNIT_EXPECT_FALSE(test, + hfsp_mt_is_ext_timestamp(cpu_to_be32(HFS_UTC_OFFSET))); + + /* every timestamp that needs xattr is stored as the mark */ + KUNIT_EXPECT_TRUE(test, + hfsp_mt_is_ext_timestamp(__hfsp_ut2mt(HFS_MAX_TIMESTAMP_SECS))); + KUNIT_EXPECT_TRUE(test, + hfsp_mt_is_ext_timestamp(__hfsp_ut2mt(TEST_Y2100_SECS))); + KUNIT_EXPECT_FALSE(test, + hfsp_mt_is_ext_timestamp(__hfsp_ut2mt(HFS_MAX_TIMESTAMP_SECS - 1))); +} + +static struct super_block *alloc_mock_sb(struct kunit *test) +{ + struct super_block *sb; + struct hfsplus_sb_info *sbi; + + sb = kunit_kzalloc(test, sizeof(*sb), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sb); + + sbi = kunit_kzalloc(test, sizeof(*sbi), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sbi); + + /* no attributes tree: xattr lookup returns -EOPNOTSUPP */ + sbi->attr_tree = NULL; + sb->s_fs_info = sbi; + + return sb; +} + +/* + * Test reading of the on-disk timestamp that doesn't need xattr. + * The superblock must not be touched in such case. + */ +static void hfsplus_read_timestamp_regular_test(struct kunit *test) +{ + static const time64_t values[] = { + HFS_MIN_TIMESTAMP_SECS, + TEST_BEFORE_UNIX_EPOCH_SECS, + TEST_UNIX_EPOCH_SECS, + TEST_Y2026_SECS, + HFS_MAX_TIMESTAMP_SECS - 1, + }; + time64_t ut; + bool has_xattr; + int err; + int i; + + for (i = 0; i < ARRAY_SIZE(values); i++) { + ut = 0; + has_xattr = true; + + err = hfsplus_read_timestamp(NULL, HFSPLUS_FIRSTUSER_CNID, + XATTR_LINUX_ACCESS_DATE_NAME, + __hfsp_ut2mt(values[i]), + &ut, &has_xattr); + KUNIT_EXPECT_EQ(test, 0, err); + KUNIT_EXPECT_EQ(test, values[i], ut); + KUNIT_EXPECT_FALSE(test, has_xattr); + } +} + +/* + * Test reading of the extended timestamp mark without xattr + * (for example, the record has been created by Mac OS X or + * the volume has no attributes tree). The timestamp must be + * HFS_MAX_TIMESTAMP_SECS without any error. + */ +static void hfsplus_read_timestamp_mark_no_xattr_test(struct kunit *test) +{ + struct super_block *sb = alloc_mock_sb(test); + static const char * const names[] = { + XATTR_LINUX_CREATE_DATE_NAME, + XATTR_LINUX_CONTENT_MOD_DATE_NAME, + XATTR_LINUX_ATTRIBUTE_MOD_DATE_NAME, + XATTR_LINUX_ACCESS_DATE_NAME, + }; + time64_t ut; + bool has_xattr; + int err; + int i; + + for (i = 0; i < ARRAY_SIZE(names); i++) { + ut = 0; + has_xattr = true; + + err = hfsplus_read_timestamp(sb, HFSPLUS_FIRSTUSER_CNID, + names[i], + HFSPLUS_EXT_TIMESTAMP_MARK, + &ut, &has_xattr); + KUNIT_EXPECT_EQ(test, 0, err); + KUNIT_EXPECT_EQ(test, HFS_MAX_TIMESTAMP_SECS, ut); + KUNIT_EXPECT_FALSE(test, has_xattr); + } +} + +/* Test that names of internal xattrs fit the name buffer */ +static void hfsplus_timestamp_xattr_names_test(struct kunit *test) +{ + static const char * const names[] = { + XATTR_LINUX_CREATE_DATE_NAME, + XATTR_LINUX_CONTENT_MOD_DATE_NAME, + XATTR_LINUX_ATTRIBUTE_MOD_DATE_NAME, + XATTR_LINUX_ACCESS_DATE_NAME, + XATTR_LINUX_BACKUP_DATE_NAME, + }; + int i; + + KUNIT_EXPECT_EQ(test, strlen(XATTR_LINUX_HFS_PREFIX), + (size_t)XATTR_LINUX_HFS_PREFIX_LEN); + + for (i = 0; i < ARRAY_SIZE(names); i++) { + size_t len = XATTR_LINUX_HFS_PREFIX_LEN + strlen(names[i]); + + KUNIT_EXPECT_LT_MSG(test, len, (size_t)XATTR_LINUX_HFS_NAME_MAX, + "name %s is too long", names[i]); + KUNIT_EXPECT_LE(test, len, (size_t)HFSPLUS_ATTR_MAX_STRLEN); + } +} + +static struct kunit_case hfsplus_time_test_cases[] = { + KUNIT_CASE(hfsplus_time_constants_test), + KUNIT_CASE(hfsplus_mt2ut_test), + KUNIT_CASE(hfsplus_ut2mt_test), + KUNIT_CASE(hfsplus_ut2mt_before_1970_test), + KUNIT_CASE(hfsplus_ut2mt_clamp_test), + KUNIT_CASE(hfsplus_time_roundtrip_test), + KUNIT_CASE(hfsplus_ut_needs_xattr_test), + KUNIT_CASE(hfsplus_mt_is_ext_timestamp_test), + KUNIT_CASE(hfsplus_read_timestamp_regular_test), + KUNIT_CASE(hfsplus_read_timestamp_mark_no_xattr_test), + KUNIT_CASE(hfsplus_timestamp_xattr_names_test), + {} +}; + +static struct kunit_suite hfsplus_time_test_suite = { + .name = "hfsplus_time", + .test_cases = hfsplus_time_test_cases, +}; + +kunit_test_suite(hfsplus_time_test_suite); + +MODULE_DESCRIPTION("KUnit tests for HFS+ date/time conversion"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING"); -- 2.43.0