src/ceph/qa/tasks/cephfs/test_flush.py

   1
   2 from textwrap import dedent
   3 from tasks.cephfs.cephfs_test_case import CephFSTestCase
   4 from tasks.cephfs.filesystem import ObjectNotFound, ROOT_INO
   5
   6
   7 class TestFlush(CephFSTestCase):
   8     def test_flush(self):
   9         self.mount_a.run_shell(["mkdir", "mydir"])
  10         self.mount_a.run_shell(["touch", "mydir/alpha"])
  11         dir_ino = self.mount_a.path_to_ino("mydir")
  12         file_ino = self.mount_a.path_to_ino("mydir/alpha")
  13
  14         # Unmount the client so that it isn't still holding caps
  15         self.mount_a.umount_wait()
  16
  17         # Before flush, the dirfrag object does not exist
  18         with self.assertRaises(ObjectNotFound):
  19             self.fs.list_dirfrag(dir_ino)
  20
  21         # Before flush, the file's backtrace has not been written
  22         with self.assertRaises(ObjectNotFound):
  23             self.fs.read_backtrace(file_ino)
  24
  25         # Before flush, there are no dentries in the root
  26         self.assertEqual(self.fs.list_dirfrag(ROOT_INO), [])
  27
  28         # Execute flush
  29         flush_data = self.fs.mds_asok(["flush", "journal"])
  30         self.assertEqual(flush_data['return_code'], 0)
  31
  32         # After flush, the dirfrag object has been created
  33         dir_list = self.fs.list_dirfrag(dir_ino)
  34         self.assertEqual(dir_list, ["alpha_head"])
  35
  36         # And the 'mydir' dentry is in the root
  37         self.assertEqual(self.fs.list_dirfrag(ROOT_INO), ['mydir_head'])
  38
  39         # ...and the data object has its backtrace
  40         backtrace = self.fs.read_backtrace(file_ino)
  41         self.assertEqual(['alpha', 'mydir'], [a['dname'] for a in backtrace['ancestors']])
  42         self.assertEqual([dir_ino, 1], [a['dirino'] for a in backtrace['ancestors']])
  43         self.assertEqual(file_ino, backtrace['ino'])
  44
  45         # ...and the journal is truncated to just a single subtreemap from the
  46         # newly created segment
  47         summary_output = self.fs.journal_tool(["event", "get", "summary"])
  48         try:
  49             self.assertEqual(summary_output,
  50                              dedent(
  51                                  """
  52                                  Events by type:
  53                                    SUBTREEMAP: 1
  54                                  Errors: 0
  55                                  """
  56                              ).strip())
  57         except AssertionError:
  58             # In some states, flushing the journal will leave you
  59             # an extra event from locks a client held.   This is
  60             # correct behaviour: the MDS is flushing the journal,
  61             # it's just that new events are getting added too.
  62             # In this case, we should nevertheless see a fully
  63             # empty journal after a second flush.
  64             self.assertEqual(summary_output,
  65                              dedent(
  66                                  """
  67                                  Events by type:
  68                                    SUBTREEMAP: 1
  69                                    UPDATE: 1
  70                                  Errors: 0
  71                                  """
  72                              ).strip())
  73             flush_data = self.fs.mds_asok(["flush", "journal"])
  74             self.assertEqual(flush_data['return_code'], 0)
  75             self.assertEqual(self.fs.journal_tool(["event", "get", "summary"]),
  76                              dedent(
  77                                  """
  78                                  Events by type:
  79                                    SUBTREEMAP: 1
  80                                  Errors: 0
  81                                  """
  82                              ).strip())
  83
  84         # Now for deletion!
  85         # We will count the RADOS deletions and MDS file purges, to verify that
  86         # the expected behaviour is happening as a result of the purge
  87         initial_dels = self.fs.mds_asok(['perf', 'dump', 'objecter'])['objecter']['osdop_delete']
  88         initial_purges = self.fs.mds_asok(['perf', 'dump', 'mds_cache'])['mds_cache']['strays_enqueued']
  89
  90         # Use a client to delete a file
  91         self.mount_a.mount()
  92         self.mount_a.wait_until_mounted()
  93         self.mount_a.run_shell(["rm", "-rf", "mydir"])
  94
  95         # Flush the journal so that the directory inode can be purged
  96         flush_data = self.fs.mds_asok(["flush", "journal"])
  97         self.assertEqual(flush_data['return_code'], 0)
  98
  99         # We expect to see a single file purge
 100         self.wait_until_true(
 101             lambda: self.fs.mds_asok(['perf', 'dump', 'mds_cache'])['mds_cache']['strays_enqueued'] - initial_purges >= 2,
 102             60)
 103
 104         # We expect two deletions, one of the dirfrag and one of the backtrace
 105         self.wait_until_true(
 106             lambda: self.fs.mds_asok(['perf', 'dump', 'objecter'])['objecter']['osdop_delete'] - initial_dels >= 2,
 107             60)  # timeout is fairly long to allow for tick+rados latencies
 108
 109         with self.assertRaises(ObjectNotFound):
 110             self.fs.list_dirfrag(dir_ino)
 111         with self.assertRaises(ObjectNotFound):
 112             self.fs.read_backtrace(file_ino)
 113         self.assertEqual(self.fs.list_dirfrag(ROOT_INO), [])