> > However, using a lock file should (?) work.
>
> The problem here is that the filesystem implementation inside the
> kernel can't use lock files to synchronize access to directories and
> metadata. Your filesystem would quickly become garbage if two systems
> are trying to update the same filesystem at the same time.
Very true. People have suggested SGI CXFS and Veritas SANpoint Foundation
Suite HA to work around this.
-F