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kunit: fat: test cluster and directory i_pos layout helpers

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Add KUnit coverage for fat_clus_to_blknr() and fat_get_blknr_offset()
using stub msdos_sb_info values so cluster-to-sector and i_pos split math
stays correct.

Link: https://lore.kernel.org/[email protected]
Signed-off-by: Adi Nata <[email protected]>
Acked-by: OGAWA Hirofumi <[email protected]>
Cc: Christian Brauner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
This commit is contained in:
Adi Nata authored and Andrew Morton committed 2026-05-28 21:24:40 -07:00
1 parent 1877a09b64
commit 410002f813
1 file changed
+33
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fs/fat/fat_test.c
+33
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@@ -20,6 +20,37 @@ static void fat_checksum_test(struct kunit *test)
KUNIT_EXPECT_EQ(test, fat_checksum("ABCDEFGHA "), (u8)98);
}
static void fat_clus_to_blknr_test(struct kunit *test)
{
struct msdos_sb_info sbi = {
.sec_per_clus = 4,
.data_start = 100,
};
KUNIT_EXPECT_EQ(test, (sector_t)100,
fat_clus_to_blknr(&sbi, FAT_START_ENT));
KUNIT_EXPECT_EQ(test, (sector_t)112, fat_clus_to_blknr(&sbi, 5));
}
static void fat_get_blknr_offset_test(struct kunit *test)
{
struct msdos_sb_info sbi = {
.dir_per_block = 16,
.dir_per_block_bits = 4,
};
sector_t blknr;
int offset;
fat_get_blknr_offset(&sbi, 0, &blknr, &offset);
KUNIT_EXPECT_EQ(test, (sector_t)0, blknr);
KUNIT_EXPECT_EQ(test, 0, offset);
fat_get_blknr_offset(&sbi, (10 << 4) | 7, &blknr, &offset);
KUNIT_EXPECT_EQ(test, (sector_t)10, blknr);
KUNIT_EXPECT_EQ(test, 7, offset);
}
struct fat_timestamp_testcase {
const char *name;
struct timespec64 ts;
@@ -341,6 +372,8 @@ static void fat_truncate_atime_test(struct kunit *test)
static struct kunit_case fat_test_cases[] = {
KUNIT_CASE(fat_checksum_test),
KUNIT_CASE(fat_clus_to_blknr_test),
KUNIT_CASE(fat_get_blknr_offset_test),
KUNIT_CASE_PARAM(fat_time_fat2unix_test, fat_time_gen_params),
KUNIT_CASE_PARAM(fat_time_unix2fat_test, fat_time_gen_params),
KUNIT_CASE_PARAM(fat_time_unix2fat_clamp_test,