Add Interrupt core flushing test

Signed-off-by: Slawomir Jankowski <slawomir.jankowski@intel.com>

test/functional/tests/fault_injection/test_fault_injection_interrupts.py

@@ -0,0 +1,101 @@
+#
+# Copyright(c) 2020 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause-Clear
+#
+from time import sleep
+
+import pytest
+
+from api.cas import casadm, casadm_parser, cli
+from api.cas.cache_config import CacheMode, CleaningPolicy, CacheModeTrait
+from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
+from core.test_run import TestRun
+from test_tools.disk_utils import Filesystem
+from test_utils import os_utils
+from test_utils.os_utils import Udev, DropCachesMode
+from test_utils.size import Size, Unit
+
+mount_point = "/mnt/cas"
+test_file_path = f"{mount_point}/test_file"
+iterations_per_config = 10
+cache_size = Size(16, Unit.GibiByte)
+
+
+@pytest.mark.parametrize("filesystem", Filesystem)
+@pytest.mark.parametrize("cache_mode", CacheMode.with_traits(CacheModeTrait.LazyWrites))
+@pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
+@pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
+def test_interrupt_core_flush(cache_mode, filesystem):
+    """
+        title: Test if OpenCAS works correctly after core's flushing interruption.
+        description: |
+          Negative test of the ability of OpenCAS to handle core flushing interruption.
+        pass_criteria:
+          - No system crash.
+          - Flushing would be stopped after interruption.
+          - Md5sum are correct during all test steps.
+          - Dirty blocks quantity after interruption is equal or lower.
+    """
+    with TestRun.step("Prepare cache and core."):
+        cache_part, core_part = prepare()
+
+    for _ in TestRun.iteration(range(iterations_per_config),
+                               f"Reload cache configuration {iterations_per_config} times."):
+
+        with TestRun.step("Start cache."):
+            cache = casadm.start_cache(cache_part, cache_mode, force=True)
+
+        with TestRun.step("Set cleaning policy to NOP."):
+            cache.set_cleaning_policy(CleaningPolicy.nop)
+
+        with TestRun.step(f"Add core device with {filesystem} filesystem and mount it."):
+            core_part.create_filesystem(filesystem)
+            core = cache.add_core(core_part)
+            core.mount(mount_point)
+
+        with TestRun.step(f"Create test file in mount point of exported object."):
+            test_file = create_test_file()
+
+        with TestRun.step("Check md5 sum of test file."):
+            test_file_md5sum_before = test_file.md5sum()
+
+        with TestRun.step("Get number of dirty data on exported object before interruption."):
+            os_utils.sync()
+            os_utils.drop_caches(DropCachesMode.ALL)
+            core_dirty_blocks_before = core.get_dirty_blocks()
+
+        with TestRun.step("Start flushing core device."):
+            flush_pid = TestRun.executor.run_in_background(
+                cli.flush_core_cmd(str(cache.cache_id), str(core.core_id)))
+            sleep(2)
+
+        with TestRun.step("Interrupt core flushing."):
+            percentage = casadm_parser.get_flushing_progress(cache.cache_id, core.core_id)
+            while percentage < 50:
+                percentage = casadm_parser.get_flushing_progress(cache.cache_id, core.core_id)
+            TestRun.executor.run(f"kill -s SIGINT {flush_pid}")
+
+        with TestRun.step("Check number of dirty data on exported object after interruption."):
+            core_dirty_blocks_after = core.get_dirty_blocks()
+            if core_dirty_blocks_after >= core_dirty_blocks_before:
+                TestRun.LOGGER.error("Quantity of dirty lines after core flush interruption "
+                                     "should be lower.")
+            if int(core_dirty_blocks_after) == 0:
+                TestRun.LOGGER.error("Quantity of dirty lines after core flush interruption "
+                                     "should not be zero.")
+
+        with TestRun.step("Unmount core and stop cache."):
+            core.unmount()
+            cache.stop()
+
+        with TestRun.step("Mount core device."):
+            core_part.mount(mount_point)
+
+        with TestRun.step("Check md5 sum of test file again."):
+            if test_file_md5sum_before != test_file.md5sum():
+                TestRun.LOGGER.error(
+                    "Md5 sums before and after interrupting core flush are different.")
+
+        with TestRun.step("Unmount core device."):
+            core_part.unmount()
+