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- From: edwardm@hpcuhe.cup.hp.com (Edward McClanahan)
- Date: Thu, 27 Aug 1992 01:13:55 GMT
- Subject: Re: File system switches
- Message-ID: <98160004@hpcuhe.cup.hp.com>
- Organization: Hewlett Packard, Cupertino
- Path: sparky!uunet!elroy.jpl.nasa.gov!sdd.hp.com!hpscdc!hplextra!hpcc05!hpcuhb!hpcuhe!edwardm
- Newsgroups: comp.os.ms-windows.programmer.win32
- References: <2562@news.cerf.net>
- Lines: 24
-
- > >Hello,
- > > Does NT support a file system switch and stackable files
- > >systems similar to vnode based UNIXs? In particular would it be
- > >possible to implement something similar to Sun Microsystem's
- > >Translucent File System (TFS)?
-
- > Windows NT's driver mechanism allows for the layering of drivers - file
- > systems are drivers which respond to the set of messages that the
- > i/o subsystem generates when requesting file services. They're not
- > "special" and don't have a different set of interfaces. All drivers
- > respond to messages which interest them, and pass them through to the
- > next driver in the chain if they're not interested.
-
- > So indeed, you could layer any one file system on top of the services
- > of another to implement intelligent archiving systems, Sun TFS-like
- > systems, or simply something that turns a file delete into a rename! You
- > can implement compression file systems or make your 1.4Mb disk image on
- > your C: drive appear to be your I: drive
-
- So, is this do-able with the SDK, or is the DDK required?
-
- > Driver layering is useful!
-
- Exactly!
-