""" Test that the forward scrub functionality can traverse metadata and apply requested tags, on well formed metadata. This is *not* the real testing for forward scrub, which will need to test how the functionality responds to damaged metadata. """ import json import logging from collections import namedtuple from textwrap import dedent from teuthology.orchestra.run import CommandFailedError from tasks.cephfs.cephfs_test_case import CephFSTestCase import struct log = logging.getLogger(__name__) ValidationError = namedtuple("ValidationError", ["exception", "backtrace"]) class TestForwardScrub(CephFSTestCase): MDSS_REQUIRED = 1 def _read_str_xattr(self, pool, obj, attr): """ Read a ceph-encoded string from a rados xattr """ output = self.fs.rados(["getxattr", obj, attr], pool=pool) strlen = struct.unpack('i', output[0:4])[0] return output[4:(4 + strlen)] def _get_paths_to_ino(self): inos = {} p = self.mount_a.run_shell(["find", "./"]) paths = p.stdout.getvalue().strip().split() for path in paths: inos[path] = self.mount_a.path_to_ino(path) return inos def test_apply_tag(self): self.mount_a.run_shell(["mkdir", "parentdir"]) self.mount_a.run_shell(["mkdir", "parentdir/childdir"]) self.mount_a.run_shell(["touch", "rfile"]) self.mount_a.run_shell(["touch", "parentdir/pfile"]) self.mount_a.run_shell(["touch", "parentdir/childdir/cfile"]) # Build a structure mapping path to inode, as we will later want # to check object by object and objects are named after ino number inos = self._get_paths_to_ino() # Flush metadata: this is a friendly test of forward scrub so we're skipping # the part where it's meant to cope with dirty metadata self.mount_a.umount_wait() self.fs.mds_asok(["flush", "journal"]) tag = "mytag" # Execute tagging forward scrub self.fs.mds_asok(["tag", "path", "/parentdir", tag]) # Wait for completion import time time.sleep(10) # FIXME watching clog isn't a nice mechanism for this, once we have a ScrubMap we'll # watch that instead # Check that dirs were tagged for dirpath in ["./parentdir", "./parentdir/childdir"]: self.assertTagged(inos[dirpath], tag, self.fs.get_metadata_pool_name()) # Check that files were tagged for filepath in ["./parentdir/pfile", "./parentdir/childdir/cfile"]: self.assertTagged(inos[filepath], tag, self.fs.get_data_pool_name()) # This guy wasn't in the tag path, shouldn't have been tagged self.assertUntagged(inos["./rfile"]) def assertUntagged(self, ino): file_obj_name = "{0:x}.00000000".format(ino) with self.assertRaises(CommandFailedError): self._read_str_xattr( self.fs.get_data_pool_name(), file_obj_name, "scrub_tag" ) def assertTagged(self, ino, tag, pool): file_obj_name = "{0:x}.00000000".format(ino) wrote = self._read_str_xattr( pool, file_obj_name, "scrub_tag" ) self.assertEqual(wrote, tag) def _validate_linkage(self, expected): inos = self._get_paths_to_ino() try: self.assertDictEqual(inos, expected) except AssertionError: log.error("Expected: {0}".format(json.dumps(expected, indent=2))) log.error("Actual: {0}".format(json.dumps(inos, indent=2))) raise def test_orphan_scan(self): # Create some files whose metadata we will flush self.mount_a.run_python(dedent(""" import os mount_point = "{mount_point}" parent = os.path.join(mount_point, "parent") os.mkdir(parent) flushed = os.path.join(parent, "flushed") os.mkdir(flushed) for f in ["alpha", "bravo", "charlie"]: open(os.path.join(flushed, f), 'w').write(f) """.format(mount_point=self.mount_a.mountpoint))) inos = self._get_paths_to_ino() # Flush journal # Umount before flush to avoid cap releases putting # things we don't want in the journal later. self.mount_a.umount_wait() self.fs.mds_asok(["flush", "journal"]) # Create a new inode that's just in the log, i.e. would # look orphaned to backward scan if backward scan wisnae # respectin' tha scrub_tag xattr. self.mount_a.mount() self.mount_a.run_shell(["mkdir", "parent/unflushed"]) self.mount_a.run_shell(["dd", "if=/dev/urandom", "of=./parent/unflushed/jfile", "bs=1M", "count=8"]) inos["./parent/unflushed"] = self.mount_a.path_to_ino("./parent/unflushed") inos["./parent/unflushed/jfile"] = self.mount_a.path_to_ino("./parent/unflushed/jfile") self.mount_a.umount_wait() # Orphan an inode by deleting its dentry # Our victim will be.... bravo. self.mount_a.umount_wait() self.fs.mds_stop() self.fs.mds_fail() self.fs.set_ceph_conf('mds', 'mds verify scatter', False) self.fs.set_ceph_conf('mds', 'mds debug scatterstat', False) frag_obj_id = "{0:x}.00000000".format(inos["./parent/flushed"]) self.fs.rados(["rmomapkey", frag_obj_id, "bravo_head"]) self.fs.mds_restart() self.fs.wait_for_daemons() # See that the orphaned file is indeed missing from a client's POV self.mount_a.mount() damaged_state = self._get_paths_to_ino() self.assertNotIn("./parent/flushed/bravo", damaged_state) self.mount_a.umount_wait() # Run a tagging forward scrub tag = "mytag123" self.fs.mds_asok(["tag", "path", "/parent", tag]) # See that the orphan wisnae tagged self.assertUntagged(inos['./parent/flushed/bravo']) # See that the flushed-metadata-and-still-present files are tagged self.assertTagged(inos['./parent/flushed/alpha'], tag, self.fs.get_data_pool_name()) self.assertTagged(inos['./parent/flushed/charlie'], tag, self.fs.get_data_pool_name()) # See that journalled-but-not-flushed file *was* tagged self.assertTagged(inos['./parent/unflushed/jfile'], tag, self.fs.get_data_pool_name()) # Run cephfs-data-scan targeting only orphans self.fs.mds_stop() self.fs.mds_fail() self.fs.data_scan(["scan_extents", self.fs.get_data_pool_name()]) self.fs.data_scan([ "scan_inodes", "--filter-tag", tag, self.fs.get_data_pool_name() ]) # After in-place injection stats should be kosher again self.fs.set_ceph_conf('mds', 'mds verify scatter', True) self.fs.set_ceph_conf('mds', 'mds debug scatterstat', True) # And we should have all the same linkage we started with, # and no lost+found, and no extra inodes! self.fs.mds_restart() self.fs.wait_for_daemons() self.mount_a.mount() self._validate_linkage(inos)