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ext4: Add unit test for mb_free_blocks

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Add unit test for mb_free_blocks.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Link: https://lore.kernel.org/r/20240103104900.464789-5-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Kemeng Shi 2024-01-03 18:48:59 +08:00 • committed by Theodore Ts'o
parent ac96b56a2f
commit b7098e1fa7
1 changed files with 69 additions and 0 deletions
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69
fs/ext4/mballoc-test.c
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@ -675,6 +675,74 @@ static void test_mb_mark_used(struct kunit *test)
ext4_mb_unload_buddy(&e4b); ext4_mb_unload_buddy(&e4b);
} }
static void
test_mb_free_blocks_range(struct kunit *test, struct ext4_buddy *e4b,
ext4_grpblk_t start, ext4_grpblk_t len, void *bitmap,
void *buddy, struct ext4_group_info *grp)
{
struct super_block *sb = (struct super_block *)test->priv;
int i;
/* mb_free_blocks will WARN if len is 0 */
if (len == 0)
return;
mb_free_blocks(NULL, e4b, start, len);
mb_clear_bits(bitmap, start, len);
/* bypass bb_free validatoin in ext4_mb_generate_buddy */
grp->bb_free += len;
memset(buddy, 0xff, sb->s_blocksize);
for (i = 0; i < MB_NUM_ORDERS(sb); i++)
grp->bb_counters[i] = 0;
ext4_mb_generate_buddy(sb, buddy, bitmap, 0, grp);
KUNIT_ASSERT_EQ(test, memcmp(buddy, e4b->bd_buddy, sb->s_blocksize),
0);
mbt_validate_group_info(test, grp, e4b->bd_info);
}
static void test_mb_free_blocks(struct kunit *test)
{
struct ext4_buddy e4b;
struct super_block *sb = (struct super_block *)test->priv;
void *bitmap, *buddy;
struct ext4_group_info *grp;
struct ext4_free_extent ex;
int ret;
int i;
struct test_range ranges[TEST_RANGE_COUNT];
/* buddy cache assumes that each page contains at least one block */
if (sb->s_blocksize > PAGE_SIZE)
kunit_skip(test, "blocksize exceeds pagesize");
bitmap = kunit_kzalloc(test, sb->s_blocksize, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bitmap);
buddy = kunit_kzalloc(test, sb->s_blocksize, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buddy);
grp = kunit_kzalloc(test, offsetof(struct ext4_group_info,
bb_counters[MB_NUM_ORDERS(sb)]), GFP_KERNEL);
ret = ext4_mb_load_buddy(sb, TEST_GOAL_GROUP, &e4b);
KUNIT_ASSERT_EQ(test, ret, 0);
ex.fe_start = 0;
ex.fe_len = EXT4_CLUSTERS_PER_GROUP(sb);
ex.fe_group = TEST_GOAL_GROUP;
mb_mark_used(&e4b, &ex);
grp->bb_free = 0;
memset(bitmap, 0xff, sb->s_blocksize);
mbt_generate_test_ranges(sb, ranges, TEST_RANGE_COUNT);
for (i = 0; i < TEST_RANGE_COUNT; i++)
test_mb_free_blocks_range(test, &e4b, ranges[i].start,
ranges[i].len, bitmap, buddy, grp);
ext4_mb_unload_buddy(&e4b);
}
static const struct mbt_ext4_block_layout mbt_test_layouts[] = { static const struct mbt_ext4_block_layout mbt_test_layouts[] = {
{ {
.blocksize_bits = 10, .blocksize_bits = 10,
@ -715,6 +783,7 @@ static struct kunit_case mbt_test_cases[] = {
KUNIT_CASE_PARAM(test_free_blocks_simple, mbt_layouts_gen_params), KUNIT_CASE_PARAM(test_free_blocks_simple, mbt_layouts_gen_params),
KUNIT_CASE_PARAM(test_mb_generate_buddy, mbt_layouts_gen_params), KUNIT_CASE_PARAM(test_mb_generate_buddy, mbt_layouts_gen_params),
KUNIT_CASE_PARAM(test_mb_mark_used, mbt_layouts_gen_params), KUNIT_CASE_PARAM(test_mb_mark_used, mbt_layouts_gen_params),
KUNIT_CASE_PARAM(test_mb_free_blocks, mbt_layouts_gen_params),
{} {}
}; };