es, I know Galen (he has been at Microsoft for years). The problem is that
you need to sit in the middle of a kernel mode stack, unless you want to
create your own storage device that is totally seperate. This causes lots
of problems, for instance if your application causes any I/O to the storage
stack you are filtering (including paging and other non-obvious areas)
things get very messy! UMDF is for simple non-storage devices that live on
busses such as USB and ethernet.
There was a user mode file system product (note file system not filter!)
that was available from StorageCraft but it appears to be no longer
available. This was based on using the file system redirector and sending
the requests to user space.
Give a little more detail on what you are attempting to do, for instance can
the files all be on a "special filesystem" that nothing else resides on, or
do they need to live in normal places? Can these "files" be on a device
that is not identified as a file system, for instanmce a device namespace?
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
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