HGFS and MiniFilter

NTFSD
1

Hi.

Filtering VMWare’s hgfs (shared folders) with a MiniFilter … is it
possible? This FS doesn’t show up in my InstanceSetup callback routine.

Thanks
Frank

2

AFAIK the HGFS is implemented as a mini-redirector, it registers itself as a FS, so you should see it. You must have installed VmWare tools + configured VM to use shared folders. Notice that Filespy with MSpy driver offers the \device\HGFS in volumes sub-menu. Passive filtering is no problem, active is challenging because recognizing of cached/noncached operations is not easy as for any redirector.

Bronislav Gabrhelik

3

wrote Newsbeitrag news:xxxxx@ntfsd…
> AFAIK the HGFS is implemented as a mini-redirector, it registers itself as
> a FS, so you should see it. You must have installed VmWare tools +
> configured VM to use shared folders. Notice that Filespy with MSpy driver
> offers the \device\HGFS in volumes sub-menu. Passive filtering is no
> problem, active is challenging because recognizing of cached/noncached
> operations is not easy as for any redirector.
>
> Bronislav Gabrhelik
>

I see. MiniSpy sample shows activity with “shared files”, too. But it’s
impossible to set context information (e.g. FltSetStreamHandleContext).
Return Value is STATUS_NOT_SUPPORTED. Too bad.

4

> I see. MiniSpy sample shows activity with “shared files”, too. *But* it’s

impossible to set context information (e.g. FltSetStreamHandleContext).
Return Value is STATUS_NOT_SUPPORTED. Too bad.

This doesn’t have to be the end of the world. People write filesystem
filters before Win2K and got around this.

If you are looking for a canned solution you might want to look at the OSR
FDDK (if its still available).

As a matter of interest, does it support Stream Contexts?

5

Brief info about OSR’s FDDK: http://www.osr.com/fddk.html – For information about any of our Products and Services send email to “Dan” at OSR.COM

In accordance with the non-commercialization rules of the list, that’s all I’ll say.

Peter
OSR

6

Hi All,

Thanks for answers.

I currently work on the HGFS file system redirector.
FYI It is a legacy (monolithic) redirector not implemented as a minirdr (I
don’t know the original decision about that) but there you go.
However, we do see many file system filters that do monitor our shares.

Maybe you have an older version? What version of the driver do you have
installed? If you don’t have the latest version can you upgrade?
(Properties version field of the vmhgfs.sys file in the system32\drivers
folder.)

Thanks
Steve

On Fri, 30 Apr 2010 23:59:48 -0700, Rod Widdowson
wrote:

>
>> I see. MiniSpy sample shows activity with “shared files”, too. But
>> it’s
>> impossible to set context information (e.g. FltSetStreamHandleContext).
>> Return Value is STATUS_NOT_SUPPORTED. Too bad.
>
> This doesn’t have to be the end of the world. People write filesystem
> filters before Win2K and got around this.
>
> If you are looking for a canned solution you might want to look at the
> OSR FDDK (if its still available).
>
> As a matter of interest, does it support Stream Contexts?

–
Steve