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Message-Id: <20231125154144.3943442-2-shikemeng@huaweicloud.com>
Date: Sat, 25 Nov 2023 23:41:40 +0800
From: Kemeng Shi <shikemeng@...weicloud.com>
To: tytso@....edu,
adilger.kernel@...ger.ca
Cc: linux-ext4@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] ext4: Add unit test for test_free_blocks_simple
Add unit test for test_free_blocks_simple.
Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
fs/ext4/mballoc-test.c | 96 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 96 insertions(+)
diff --git a/fs/ext4/mballoc-test.c b/fs/ext4/mballoc-test.c
index f94901fd3..3aac42ea6 100644
--- a/fs/ext4/mballoc-test.c
+++ b/fs/ext4/mballoc-test.c
@@ -5,6 +5,7 @@
#include <kunit/test.h>
#include <kunit/static_stub.h>
+#include <linux/random.h>
#include "ext4.h"
@@ -112,6 +113,13 @@ static void mbt_ctx_mark_used(struct super_block *sb, ext4_group_t group,
mb_set_bits(grp_ctx->bitmap_bh.b_data, start, len);
}
+static void *mbt_ctx_bitmap(struct super_block *sb, ext4_group_t group)
+{
+ struct mbt_grp_ctx *grp_ctx = MBT_GRP_CTX(sb, group);
+
+ return grp_ctx->bitmap_bh.b_data;
+}
+
/* called after mbt_init_sb_layout */
static int mbt_ctx_init(struct super_block *sb)
{
@@ -297,6 +305,93 @@ static void test_new_blocks_simple(struct kunit *test)
"unexpectedly get block when no block is available");
}
+#define TEST_RANGE_COUNT 8
+
+struct test_range {
+ ext4_grpblk_t start;
+ ext4_grpblk_t len;
+};
+
+static void
+mbt_generate_test_ranges(struct super_block *sb, struct test_range *ranges,
+ int count)
+{
+ ext4_grpblk_t start, len, max;
+ int i;
+
+ max = EXT4_CLUSTERS_PER_GROUP(sb) / count;
+ for (i = 0; i < count; i++) {
+ start = get_random_u32() % max;
+ len = get_random_u32() % max;
+ len = min(len, max - start);
+
+ ranges[i].start = start + i * max;
+ ranges[i].len = len;
+ }
+}
+
+static void
+validate_free_blocks_simple(struct kunit *test, struct super_block *sb,
+ ext4_group_t goal_group, ext4_grpblk_t start,
+ ext4_grpblk_t len)
+{
+ void *bitmap;
+ ext4_grpblk_t bit, max = EXT4_CLUSTERS_PER_GROUP(sb);
+ ext4_group_t i;
+
+ for (i = 0; i < ext4_get_groups_count(sb); i++) {
+ if (i == goal_group)
+ continue;
+
+ bitmap = mbt_ctx_bitmap(sb, i);
+ bit = mb_find_next_zero_bit(bitmap, max, 0);
+ KUNIT_ASSERT_EQ_MSG(test, bit, max,
+ "free block on unexpected group %d", i);
+ }
+
+ bitmap = mbt_ctx_bitmap(sb, goal_group);
+ bit = mb_find_next_zero_bit(bitmap, max, 0);
+ KUNIT_ASSERT_EQ(test, bit, start);
+
+ bit = mb_find_next_bit(bitmap, max, bit + 1);
+ KUNIT_ASSERT_EQ(test, bit, start + len);
+}
+
+static void
+test_free_blocks_simple_range(struct kunit *test, ext4_group_t goal_group,
+ ext4_grpblk_t start, ext4_grpblk_t len)
+{
+ struct super_block *sb = (struct super_block *)test->priv;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct inode inode = { .i_sb = sb, };
+ ext4_fsblk_t block;
+
+ if (len == 0)
+ return;
+
+ block = ext4_group_first_block_no(sb, goal_group) +
+ EXT4_C2B(sbi, start);
+ ext4_free_blocks_simple(&inode, block, len);
+ validate_free_blocks_simple(test, sb, goal_group, start, len);
+ mbt_ctx_mark_used(sb, goal_group, 0, EXT4_CLUSTERS_PER_GROUP(sb));
+}
+
+static void test_free_blocks_simple(struct kunit *test)
+{
+ struct super_block *sb = (struct super_block *)test->priv;
+ ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
+ ext4_group_t i;
+ struct test_range ranges[TEST_RANGE_COUNT];
+
+ for (i = 0; i < ext4_get_groups_count(sb); i++)
+ mbt_ctx_mark_used(sb, i, 0, max);
+
+ mbt_generate_test_ranges(sb, ranges, TEST_RANGE_COUNT);
+ for (i = 0; i < TEST_RANGE_COUNT; i++)
+ test_free_blocks_simple_range(test, TEST_GOAL_GROUP,
+ ranges[i].start, ranges[i].len);
+}
+
static const struct mbt_ext4_block_layout mbt_test_layouts[] = {
{
.blocksize_bits = 10,
@@ -334,6 +429,7 @@ KUNIT_ARRAY_PARAM(mbt_layouts, mbt_test_layouts, mbt_show_layout);
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),
{}
};
--
2.30.0
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