def test_destroy_active_snapshot(self):
self.assertEqual(
elastio_snap.setup(self.minor, self.device, self.cow_full_path), 0)
self.assertEqual(elastio_snap.destroy(self.minor), 0)
self.assertFalse(os.path.exists(self.snap_device))
self.assertIsNone(elastio_snap.info(self.minor))
def test_destroy_unverified_incremental(self):
util.unmount(self.mount)
self.addCleanup(util.mount, self.device, self.mount)
self.assertEqual(
elastio_snap.reload_incremental(self.minor, self.device,
self.cow_reload_path), 0)
self.assertEqual(elastio_snap.destroy(self.minor), 0)
self.assertFalse(os.path.exists(self.snap_device))
self.assertIsNone(elastio_snap.info(self.minor))
def test_destroy_dormant_snapshot(self):
self.assertEqual(
elastio_snap.setup(self.minor, self.device, self.cow_full_path), 0)
util.unmount(self.mount)
self.addCleanup(os.remove, self.cow_full_path)
self.addCleanup(util.mount, self.device, self.mount)
self.assertEqual(elastio_snap.destroy(self.minor), 0)
self.assertFalse(os.path.exists(self.snap_device))
self.assertIsNone(elastio_snap.info(self.minor))
def test_track_writes(self):
testfile = "{}/testfile".format(self.mount)
self.assertEqual(
elastio_snap.setup(self.minor, self.device, self.cow_full_path), 0)
self.addCleanup(elastio_snap.destroy, self.minor)
os.sync()
info = elastio_snap.info(self.minor)
start_nr = info["nr_changed_blocks"]
self.assertNotEqual(start_nr, 0)
with open(testfile, "w") as f:
f.write("The quick brown fox")
self.addCleanup(os.remove, testfile)
os.sync()
info = elastio_snap.info(self.minor)
end_nr = info["nr_changed_blocks"]
self.assertGreater(end_nr, start_nr)
def test_transition_fs_sync_cow_full(self):
scratch = "{}/scratch".format(self.mount)
falloc = 50
self.assertEqual(elastio_snap.setup(self.minor, self.device, self.cow_full_path, fallocated_space=falloc), 0)
self.addCleanup(elastio_snap.destroy, self.minor)
util.dd("/dev/zero", scratch, falloc + 10, bs="1M")
self.addCleanup(os.remove, scratch)
# Possible errors doing this:
# * EINVAL: The file system already performed the sync
# * EFBIG: The module performed the sync
# We want the former to happen, so make the OS sync everything.
os.sync()
self.assertEqual(elastio_snap.transition_to_incremental(self.minor), errno.EINVAL)
snapdev = elastio_snap.info(self.minor)
self.assertIsNotNone(snapdev)
self.assertEqual(snapdev["error"], -errno.EFBIG)
self.assertEqual(snapdev["state"], 3)
def test_transition_mod_sync_cow_full(self):
scratch = "{}/scratch".format(self.mount)
falloc = 50
self.assertEqual(elastio_snap.setup(self.minor, self.device, self.cow_full_path, fallocated_space=falloc), 0)
self.addCleanup(elastio_snap.destroy, self.minor)
util.dd("/dev/zero", scratch, falloc + 10, bs="1M")
self.addCleanup(os.remove, scratch)
# Possible errors doing this:
# * EINVAL: The file system already performed the sync
# * EFBIG: The module performed the sync
# We want the later to happen, so try to transition without calling sync.
err = elastio_snap.transition_to_incremental(self.minor)
if (err != errno.EFBIG):
self.skipTest("Kernel flushed before module")
snapdev = elastio_snap.info(self.minor)
self.assertIsNotNone(snapdev)
self.assertEqual(snapdev["error"], -errno.EFBIG)
self.assertEqual(snapdev["state"], 2)
def test_transition_nonexistent_snapshot(self):
self.assertIsNone(elastio_snap.info(self.minor))
self.assertEqual(elastio_snap.transition_to_incremental(self.minor), errno.ENOENT)