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Summary: The Overlay is the natural home for nextInodeNumber_ now that every directory allocates inode numbers for its children right away. This also simplifies serializing nextInodeNumber_ to disk in the following diff. Reviewed By: simpkins Differential Revision: D8192442 fbshipit-source-id: 9b776a73c8d7653002b55985d592b1746e52f878
104 lines
3.7 KiB
Python
104 lines
3.7 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright (c) 2016-present, Facebook, Inc.
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# All rights reserved.
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#
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# This source code is licensed under the BSD-style license found in the
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# LICENSE file in the root directory of this source tree. An additional grant
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# of patent rights can be found in the PATENTS file in the same directory.
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import os
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import unittest
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from typing import Dict
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from .lib import testcase
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@testcase.eden_repo_test
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class PersistenceTest(testcase.EdenRepoTest):
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def populate_repo(self) -> None:
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self.repo.write_file("file_in_root", "contents1")
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self.repo.write_file("subdir/file_in_subdir", "contents2")
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self.repo.write_file("subdir2/file_in_subdir2", "contents3")
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self.repo.commit("Initial commit.")
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# These tests restart Eden and expect data to have persisted.
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def select_storage_engine(self) -> str:
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return "sqlite"
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def edenfs_logging_settings(self) -> Dict[str, str]:
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return {"eden.strace": "DBG7", "eden.fs.fuse": "DBG7"}
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# It is not a strict requirement that Eden always remember inode numbers
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# across restart -- we could theoretically drop them whenever we know it's
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# not sensible for a program to remember them across whatever event.
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#
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# However, today we remember metadata keyed on inode, and thus Eden does,
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# in practice remember them across restarts.
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def test_preserves_inode_numbers_across_restarts(self):
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before1 = os.lstat(os.path.join(self.mount, "subdir/file_in_subdir"))
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before2 = os.lstat(os.path.join(self.mount, "subdir2/file_in_subdir2"))
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self.eden.shutdown()
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self.eden.start()
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# stat in reverse order
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after2 = os.lstat(os.path.join(self.mount, "subdir2/file_in_subdir2"))
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after1 = os.lstat(os.path.join(self.mount, "subdir/file_in_subdir"))
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self.assertEqual(before1.st_ino, after1.st_ino)
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self.assertEqual(before2.st_ino, after2.st_ino)
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def test_preserves_nonmaterialized_inode_metadata(self) -> None:
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inode_paths = [
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"file_in_root",
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"subdir",
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"subdir/file_in_subdir", # we care about trees too
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]
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old_stats = [os.lstat(os.path.join(self.mount, path)) for path in inode_paths]
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self.eden.shutdown()
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self.eden.start()
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new_stats = [os.lstat(os.path.join(self.mount, path)) for path in inode_paths]
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for (path, old_stat, new_stat) in zip(inode_paths, old_stats, new_stats):
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self.assertEqual(
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old_stat.st_ino,
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new_stat.st_ino,
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f"inode numbers must line up for path {path}",
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)
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self.assertEqual(
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old_stat.st_mode, new_stat.st_mode, f"mode must line up for path {path}"
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)
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self.assertEqual(
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old_stat.st_atime,
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new_stat.st_atime,
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f"atime must line up for path {path}",
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)
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self.assertEqual(
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old_stat.st_mtime,
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new_stat.st_mtime,
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f"mtime must line up for path {path}",
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)
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self.assertEqual(
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old_stat.st_ctime,
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new_stat.st_ctime,
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f"ctime must line up for path {path}",
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)
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def test_does_not_reuse_inode_numbers_after_cold_restart(self):
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newdir1 = os.path.join(self.mount, "subdir", "newdir1")
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os.mkdir(newdir1)
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newdir_stat1 = os.lstat(newdir1)
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self.eden.shutdown()
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self.eden.start()
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newdir2 = os.path.join(self.mount, "subdir", "newdir2")
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os.mkdir(newdir2)
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newdir_stat2 = os.lstat(newdir2)
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self.assertGreater(newdir_stat2.st_ino, newdir_stat1.st_ino)
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