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ext4: Add unit test for mb_mark_used 

Add unit test for mb_mark_used

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Link: https://lore.kernel.org/r/20240103104900.464789-4-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Kemeng Shi 2024-01-03 18:48:58 +08:00 committed by Theodore Ts'o
parent 67d2a11b22
commit ac96b56a2f
1 changed files with 78 additions and 0 deletions
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78
fs/ext4/mballoc-test.c
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@ -148,9 +148,13 @@ static void mbt_init_sb_layout(struct super_block *sb,
static int mbt_grp_ctx_init(struct super_block *sb,
struct mbt_grp_ctx *grp_ctx)
{
ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
grp_ctx->bitmap_bh.b_data = kzalloc(EXT4_BLOCK_SIZE(sb), GFP_KERNEL);
if (grp_ctx->bitmap_bh.b_data == NULL)
return -ENOMEM;
mb_set_bits(grp_ctx->bitmap_bh.b_data, max, sb->s_blocksize * 8 - max);
ext4_free_group_clusters_set(sb, &grp_ctx->desc, max);
return 0;
}
@ -197,6 +201,8 @@ static int mbt_ctx_init(struct super_block *sb)
* block which will fail ext4_sb_block_valid check.
*/
mb_set_bits(ctx->grp_ctx[0].bitmap_bh.b_data, 0, 1);
ext4_free_group_clusters_set(sb, &ctx->grp_ctx[0].desc,
EXT4_CLUSTERS_PER_GROUP(sb) - 1);
return 0;
out:
@ -231,6 +237,13 @@ static int ext4_wait_block_bitmap_stub(struct super_block *sb,
ext4_group_t block_group,
struct buffer_head *bh)
{
/*
* real ext4_wait_block_bitmap will set these flags and
* functions like ext4_mb_init_cache will verify the flags.
*/
set_buffer_uptodate(bh);
set_bitmap_uptodate(bh);
set_buffer_verified(bh);
return 0;
}
@ -598,6 +611,70 @@ static void test_mb_generate_buddy(struct kunit *test)
}
}
static void
test_mb_mark_used_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;
struct ext4_free_extent ex;
int i;
/* mb_mark_used only accepts non-zero len */
if (len == 0)
return;
ex.fe_start = start;
ex.fe_len = len;
ex.fe_group = TEST_GOAL_GROUP;
mb_mark_used(e4b, &ex);
mb_set_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_mark_used(struct kunit *test)
{
struct ext4_buddy e4b;
struct super_block *sb = (struct super_block *)test->priv;
void *bitmap, *buddy;
struct ext4_group_info *grp;
int ret;
struct test_range ranges[TEST_RANGE_COUNT];
int i;
/* 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);
grp->bb_free = EXT4_CLUSTERS_PER_GROUP(sb);
mbt_generate_test_ranges(sb, ranges, TEST_RANGE_COUNT);
for (i = 0; i < TEST_RANGE_COUNT; i++)
test_mb_mark_used_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[] = {
{
.blocksize_bits = 10,
@ -637,6 +714,7 @@ static struct kunit_case mbt_test_cases[] = {
KUNIT_CASE_PARAM(test_new_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_mark_used, mbt_layouts_gen_params),
{}
};