Instead, add File.SetInode(), so Files can update inodes if needed.

This prevents forgetting or overwriting the Ino field.  Add a test.

- LoggingFileSystem
- PathDebugFileSystem
- TimingFileSystem

needed.

all files.

This makes serializing file changes easier, as all removed files will
have explicit deletion entries.

The benchmarks cannot accurately identify its benefit, and it has a
tangible drawback in that it locks up the daemon if it has many
blocking calls.