tests: Add test for classification by file name prefix

Signed-off-by: Mariusz Barczak <mariusz.barczak@intel.com>
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

test/functional/api/cas/ioclass_config.py

@@ -99,8 +99,9 @@ class IoClass:
         return random_list
 
     def set_random_rule(self):
-        rules = ["metadata", "direct", "file_size", "directory", "io_class", "extension", "lba",
-                 "pid", "process_name", "file_offset", "request_size"]
+        rules = ["metadata", "direct", "file_size", "directory", "io_class",
+                 "extension", "file_name_prefix", "lba", "pid", "process_name",
+                 "file_offset", "request_size"]
         if os_utils.get_kernel_version() >= version.Version("4.13"):
             rules.append("wlth")
 
@@ -117,7 +118,7 @@ class IoClass:
             rule += f":{Operator(random.randrange(len(Operator))).name}:{random.randrange(1000000)}"
         elif rule == "io_class":
             rule += f":{random.randrange(MAX_IO_CLASS_PRIORITY + 1)}"
-        elif rule in ["extension", "process_name"]:
+        elif rule in ["extension", "process_name", "file_name_prefix"]:
             rule += f":{random_string(random.randint(1, 10))}"
         if random.randrange(2):
             rule += "&done"

test/functional/tests/io_class/test_io_class_file.py

@@ -77,6 +77,84 @@ def test_ioclass_file_extension():
         assert stats["dirty"].get_value(Unit.Blocks4096) == 0
 
 
+@pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
+@pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
+def test_ioclass_file_name_prefix():
+    cache, core = prepare()
+    ioclass_id = 1
+    cached_files = ["test", "test.txt", "test1", "test1.txt"]
+    not_cached_files = ["file1", "file2", "file4", "file5", "tes"]
+    dd_size = Size(4, Unit.KibiByte)
+    dd_count = 10
+
+    ioclass_config.remove_ioclass_config()
+    ioclass_config.create_ioclass_config(False)
+
+    # Avoid caching anything else than files with specified prefix
+    ioclass_config.add_ioclass(
+        ioclass_id=0,
+        eviction_priority=255,
+        allocation=False,
+        rule=f"unclassified",
+        ioclass_config_path=ioclass_config_path,
+    )
+    # Enables file with specified prefix to be cached
+    ioclass_config.add_ioclass(
+        ioclass_id=ioclass_id,
+        eviction_priority=1,
+        allocation=True,
+        rule=f"file_name_prefix:test&done",
+        ioclass_config_path=ioclass_config_path,
+    )
+    casadm.load_io_classes(cache_id=cache.cache_id, file=ioclass_config_path)
+
+    TestRun.LOGGER.info(
+        f"Preparing filesystem and mounting {core.system_path} at {mountpoint}"
+    )
+
+    previous_occupancy = cache.get_occupancy()
+
+    core.create_filesystem(Filesystem.ext3)
+    core.mount(mountpoint)
+
+    assert previous_occupancy.get_value() <= cache.get_occupancy().get_value()
+
+    # Filesystem creation caused metadata IO which is not supposed
+    # to be cached
+
+    # Check if files with proper prefix are cached
+    TestRun.LOGGER.info(f"Writing files which are supposed to be cached.")
+    for f in cached_files:
+        dd = (
+            Dd()
+            .input("/dev/zero")
+            .output(f"{mountpoint}/{f}")
+            .count(dd_count)
+            .block_size(dd_size)
+        )
+        dd.run()
+        sync()
+        current_occupancy = cache.get_occupancy()
+        assert current_occupancy == previous_occupancy
+        previous_occupancy = current_occupancy
+
+    cache.flush_cache()
+
+    # Check if file with improper extension is not cached
+    TestRun.LOGGER.info(f"Writing files which are not supposed to be cached.")
+    for f in not_cached_files:
+        dd = (
+            Dd()
+            .input("/dev/zero")
+            .output(f"{mountpoint}/{f}")
+            .count(dd_count)
+            .block_size(dd_size)
+        )
+        dd.run()
+        sync()
+        current_occupancy = cache.get_occupancy()
+        assert current_occupancy != previous_occupancy
+
 @pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
 @pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
 def test_ioclass_file_extension_preexisting_filesystem():