Extension for file management under postgres

Does anyone know of a module for postgres that can do metadata management in
postgres but actual storage of binary objects in filesystem ?
Not really using Postgres large object but want to just do the metadata
management with postgres. Example, need to store file
name/size/directory/drive/node in postgres but the actual file in a filesystem.
Also utilities that will all to do file rename (and metadata rename) within a
single transaction. Similarly file delete or file copy as well.
Also maybe webdav or ftp extensions to do get/put from web front. (the metadata
would be from postgres and actual object from filesystem)

This sounds like a typical exercise and don't want to reinvent if the code is
already out there.

many thanks ! -AJ