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Subject[PATCH v3 kunit-next 2/2] kunit: add support for named resources
Date
The kunit resources API allows for custom initialization and
cleanup code (init/fini); here a new resource add function sets
the "struct kunit_resource" "name" field, and calls the standard
add function. Having a simple way to name resources is
useful in cases such as multithreaded tests where a set of
resources are shared among threads; a pointer to the
"struct kunit *" test state then is all that is needed to
retrieve and use named resources. Support is provided to add,
find and destroy named resources; the latter two are simply
wrappers that use a "match-by-name" callback.

If an attempt to add a resource with a name that already exists
is made kunit_add_named_resource() will return -EEXIST.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
include/kunit/test.h | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
lib/kunit/kunit-test.c | 37 ++++++++++++++++++++++++++++++++++
lib/kunit/test.c | 24 ++++++++++++++++++++++
3 files changed, 115 insertions(+)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 8c7f3ff..ac59d18 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -72,9 +72,15 @@
* return kunit_alloc_resource(test, kunit_kmalloc_init,
* kunit_kmalloc_free, &params);
* }
+ *
+ * Resources can also be named, with lookup/removal done on a name
+ * basis also. kunit_add_named_resource(), kunit_find_named_resource()
+ * and kunit_destroy_named_resource(). Resource names must be
+ * unique within the test instance.
*/
struct kunit_resource {
void *data;
+ const char *name; /* optional name */

/* private: internal use only. */
kunit_resource_init_t init;
@@ -345,6 +351,21 @@ int kunit_add_resource(struct kunit *test,
kunit_resource_free_t free,
struct kunit_resource *res,
void *data);
+
+/**
+ * kunit_add_named_resource() - Add a named *test managed resource*.
+ * @test: The test context object.
+ * @init: a user-supplied function to initialize the resource data, if needed.
+ * @free: a user-supplied function to free the resource data, if needed.
+ * @name_data: name and data to be set for resource.
+ */
+int kunit_add_named_resource(struct kunit *test,
+ kunit_resource_init_t init,
+ kunit_resource_free_t free,
+ struct kunit_resource *res,
+ const char *name,
+ void *data);
+
/**
* kunit_alloc_resource() - Allocates a *test managed resource*.
* @test: The test context object.
@@ -400,6 +421,19 @@ static inline bool kunit_resource_instance_match(struct kunit *test,
}

/**
+ * kunit_resource_name_match() - Match a resource with the same name.
+ * @test: Test case to which the resource belongs.
+ * @res: The resource.
+ * @match_name: The name to match against.
+ */
+static inline bool kunit_resource_name_match(struct kunit *test,
+ struct kunit_resource *res,
+ void *match_name)
+{
+ return res->name && strcmp(res->name, match_name) == 0;
+}
+
+/**
* kunit_find_resource() - Find a resource using match function/data.
* @test: Test case to which the resource belongs.
* @match: match function to be applied to resources/match data.
@@ -428,6 +462,19 @@ static inline bool kunit_resource_instance_match(struct kunit *test,
}

/**
+ * kunit_find_named_resource() - Find a resource using match name.
+ * @test: Test case to which the resource belongs.
+ * @name: match name.
+ */
+static inline struct kunit_resource *
+kunit_find_named_resource(struct kunit *test,
+ const char *name)
+{
+ return kunit_find_resource(test, kunit_resource_name_match,
+ (void *)name);
+}
+
+/**
* kunit_destroy_resource() - Find a kunit_resource and destroy it.
* @test: Test case to which the resource belongs.
* @match: Match function. Returns whether a given resource matches @match_data.
@@ -440,6 +487,13 @@ int kunit_destroy_resource(struct kunit *test,
kunit_resource_match_t match,
void *match_data);

+static inline int kunit_destroy_named_resource(struct kunit *test,
+ const char *name)
+{
+ return kunit_destroy_resource(test, kunit_resource_name_match,
+ (void *)name);
+}
+
/**
* kunit_remove_resource: remove resource from resource list associated with
* test.
diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c
index 03f3eca..69f9024 100644
--- a/lib/kunit/kunit-test.c
+++ b/lib/kunit/kunit-test.c
@@ -325,6 +325,42 @@ static void kunit_resource_test_static(struct kunit *test)
KUNIT_EXPECT_TRUE(test, list_empty(&test->resources));
}

+static void kunit_resource_test_named(struct kunit *test)
+{
+ struct kunit_resource res1, res2, *found = NULL;
+ struct kunit_test_resource_context ctx;
+
+ KUNIT_EXPECT_EQ(test,
+ kunit_add_named_resource(test, NULL, NULL, &res1,
+ "resource_1", &ctx),
+ 0);
+ KUNIT_EXPECT_PTR_EQ(test, res1.data, (void *)&ctx);
+
+ KUNIT_EXPECT_EQ(test,
+ kunit_add_named_resource(test, NULL, NULL, &res1,
+ "resource_1", &ctx),
+ -EEXIST);
+
+ KUNIT_EXPECT_EQ(test,
+ kunit_add_named_resource(test, NULL, NULL, &res2,
+ "resource_2", &ctx),
+ 0);
+
+ found = kunit_find_named_resource(test, "resource_1");
+
+ KUNIT_EXPECT_PTR_EQ(test, found, &res1);
+
+ if (found)
+ kunit_put_resource(&res1);
+
+ KUNIT_EXPECT_EQ(test, kunit_destroy_named_resource(test, "resource_2"),
+ 0);
+
+ kunit_cleanup(test);
+
+ KUNIT_EXPECT_TRUE(test, list_empty(&test->resources));
+}
+
static int kunit_resource_test_init(struct kunit *test)
{
struct kunit_test_resource_context *ctx =
@@ -354,6 +390,7 @@ static void kunit_resource_test_exit(struct kunit *test)
KUNIT_CASE(kunit_resource_test_cleanup_resources),
KUNIT_CASE(kunit_resource_test_proper_free_ordering),
KUNIT_CASE(kunit_resource_test_static),
+ KUNIT_CASE(kunit_resource_test_named),
{}
};

diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 5560cdd..2cb7c62 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -442,6 +442,30 @@ int kunit_add_resource(struct kunit *test,
}
EXPORT_SYMBOL_GPL(kunit_add_resource);

+int kunit_add_named_resource(struct kunit *test,
+ kunit_resource_init_t init,
+ kunit_resource_free_t free,
+ struct kunit_resource *res,
+ const char *name,
+ void *data)
+{
+ struct kunit_resource *existing;
+
+ if (!name)
+ return -EINVAL;
+
+ existing = kunit_find_named_resource(test, name);
+ if (existing) {
+ kunit_put_resource(existing);
+ return -EEXIST;
+ }
+
+ res->name = name;
+
+ return kunit_add_resource(test, init, free, res, data);
+}
+EXPORT_SYMBOL_GPL(kunit_add_named_resource);
+
struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test,
kunit_resource_init_t init,
kunit_resource_free_t free,
--
1.8.3.1
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