btrfs: tests: return errors from extent map tests

The individual testcases for extent maps do not return an error on
allocation failures. This is not a big problem as the allocation don't
fail in general but there are functional tests handled with ASSERTS.
This makes tests dependent on them and it's not reliable.

This patch adds the allocation failure handling and allows for the
conversion of the asserts to proper error handling and reporting.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/tests/extent-map-tests.c

@@ -47,7 +47,7 @@ static void free_extent_map_tree(struct extent_map_tree *em_tree)
  *                                    ->add_extent_mapping(0, 16K)
  *                                    -> #handle -EEXIST
  */
-static void test_case_1(struct btrfs_fs_info *fs_info,
+static int test_case_1(struct btrfs_fs_info *fs_info,
 		struct extent_map_tree *em_tree)
 {
 	struct extent_map *em;
@@ -57,8 +57,7 @@ static void test_case_1(struct btrfs_fs_info *fs_info,
 
 	em = alloc_extent_map();
 	if (!em)
-		/* Skip the test on error. */
-		return;
+		return -ENOMEM;
 
 	/* Add [0, 16K) */
 	em->start = 0;
@@ -71,8 +70,10 @@ static void test_case_1(struct btrfs_fs_info *fs_info,
 
 	/* Add [16K, 20K) following [0, 16K)  */
 	em = alloc_extent_map();
-	if (!em)
+	if (!em) {
+		ret = -ENOMEM;
 		goto out;
+	}
 
 	em->start = SZ_16K;
 	em->len = SZ_4K;
@@ -83,8 +84,10 @@ static void test_case_1(struct btrfs_fs_info *fs_info,
 	free_extent_map(em);
 
 	em = alloc_extent_map();
-	if (!em)
+	if (!em) {
+		ret = -ENOMEM;
 		goto out;
+	}
 
 	/* Add [0, 8K), should return [0, 16K) instead. */
 	em->start = start;
@@ -102,9 +105,12 @@ static void test_case_1(struct btrfs_fs_info *fs_info,
 			 start, start + len, ret, em->start, em->len,
 			 em->block_start, em->block_len);
 	free_extent_map(em);
+	ret = 0;
 out:
 	/* free memory */
 	free_extent_map_tree(em_tree);
+
+	return ret;
 }
 
 /*
@@ -113,7 +119,7 @@ static void test_case_1(struct btrfs_fs_info *fs_info,
  * Reading the inline ending up with EEXIST, ie. read an inline
  * extent and discard page cache and read it again.
  */
-static void test_case_2(struct btrfs_fs_info *fs_info,
+static int test_case_2(struct btrfs_fs_info *fs_info,
 		struct extent_map_tree *em_tree)
 {
 	struct extent_map *em;
@@ -121,8 +127,7 @@ static void test_case_2(struct btrfs_fs_info *fs_info,
 
 	em = alloc_extent_map();
 	if (!em)
-		/* Skip the test on error. */
-		return;
+		return -ENOMEM;
 
 	/* Add [0, 1K) */
 	em->start = 0;
@@ -135,8 +140,10 @@ static void test_case_2(struct btrfs_fs_info *fs_info,
 
 	/* Add [4K, 4K) following [0, 1K)  */
 	em = alloc_extent_map();
-	if (!em)
+	if (!em) {
+		ret = -ENOMEM;
 		goto out;
+	}
 
 	em->start = SZ_4K;
 	em->len = SZ_4K;
@@ -147,8 +154,10 @@ static void test_case_2(struct btrfs_fs_info *fs_info,
 	free_extent_map(em);
 
 	em = alloc_extent_map();
-	if (!em)
+	if (!em) {
+		ret = -ENOMEM;
 		goto out;
+	}
 
 	/* Add [0, 1K) */
 	em->start = 0;
@@ -166,12 +175,15 @@ static void test_case_2(struct btrfs_fs_info *fs_info,
 			 ret, em->start, em->len, em->block_start,
 			 em->block_len);
 	free_extent_map(em);
+	ret = 0;
 out:
 	/* free memory */
 	free_extent_map_tree(em_tree);
+
+	return ret;
 }
 
-static void __test_case_3(struct btrfs_fs_info *fs_info,
+static int __test_case_3(struct btrfs_fs_info *fs_info,
 		struct extent_map_tree *em_tree, u64 start)
 {
 	struct extent_map *em;
@@ -180,8 +192,7 @@ static void __test_case_3(struct btrfs_fs_info *fs_info,
 
 	em = alloc_extent_map();
 	if (!em)
-		/* Skip this test on error. */
-		return;
+		return -ENOMEM;
 
 	/* Add [4K, 8K) */
 	em->start = SZ_4K;
@@ -193,8 +204,10 @@ static void __test_case_3(struct btrfs_fs_info *fs_info,
 	free_extent_map(em);
 
 	em = alloc_extent_map();
-	if (!em)
+	if (!em) {
+		ret = -ENOMEM;
 		goto out;
+	}
 
 	/* Add [0, 16K) */
 	em->start = 0;
@@ -217,9 +230,12 @@ static void __test_case_3(struct btrfs_fs_info *fs_info,
 			 start, start + len, ret, em->start, em->len,
 			 em->block_start, em->block_len);
 	free_extent_map(em);
+	ret = 0;
 out:
 	/* free memory */
 	free_extent_map_tree(em_tree);
+
+	return ret;
 }
 
 /*
@@ -246,7 +262,7 @@ static void test_case_3(struct btrfs_fs_info *fs_info,
 	__test_case_3(fs_info, em_tree, (12 * 1024ULL));
 }
 
-static void __test_case_4(struct btrfs_fs_info *fs_info,
+static int __test_case_4(struct btrfs_fs_info *fs_info,
 		struct extent_map_tree *em_tree, u64 start)
 {
 	struct extent_map *em;
@@ -255,8 +271,7 @@ static void __test_case_4(struct btrfs_fs_info *fs_info,
 
 	em = alloc_extent_map();
 	if (!em)
-		/* Skip this test on error. */
-		return;
+		return -ENOMEM;
 
 	/* Add [0K, 8K) */
 	em->start = 0;
@@ -268,8 +283,10 @@ static void __test_case_4(struct btrfs_fs_info *fs_info,
 	free_extent_map(em);
 
 	em = alloc_extent_map();
-	if (!em)
+	if (!em) {
+		ret = -ENOMEM;
 		goto out;
+	}
 
 	/* Add [8K, 24K) */
 	em->start = SZ_8K;
@@ -281,8 +298,10 @@ static void __test_case_4(struct btrfs_fs_info *fs_info,
 	free_extent_map(em);
 
 	em = alloc_extent_map();
-	if (!em)
+	if (!em) {
+		ret = -ENOMEM;
 		goto out;
+	}
 	/* Add [0K, 32K) */
 	em->start = 0;
 	em->len = SZ_32K;
@@ -299,9 +318,12 @@ static void __test_case_4(struct btrfs_fs_info *fs_info,
 			 start, len, ret, em->start, em->len, em->block_start,
 			 em->block_len);
 	free_extent_map(em);
+	ret = 0;
 out:
 	/* free memory */
 	free_extent_map_tree(em_tree);
+
+	return ret;
 }
 
 /*
@@ -340,6 +362,7 @@ int btrfs_test_extent_map(void)
 {
 	struct btrfs_fs_info *fs_info = NULL;
 	struct extent_map_tree *em_tree;
+	int ret = 0;
 
 	test_msg("running extent_map tests");
 
@@ -354,9 +377,10 @@ int btrfs_test_extent_map(void)
 	}
 
 	em_tree = kzalloc(sizeof(*em_tree), GFP_KERNEL);
-	if (!em_tree)
-		/* Skip the test on error. */
+	if (!em_tree) {
+		ret = -ENOMEM;
 		goto out;
+	}
 
 	extent_map_tree_init(em_tree);
 
@@ -369,5 +393,5 @@ int btrfs_test_extent_map(void)
 out:
 	btrfs_free_dummy_fs_info(fs_info);
 
-	return 0;
+	return ret;
 }