Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results

Before Posting...
Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

File system filter

OSR_Community_UserOSR_Community_User Member Posts: 110,217
Hello developers,
I have questions about file system filter driver.
If I'm using file system filter driver, can I obtain the VCB of volume or FCB of file.
Can I purge a volume cache if there are some opened files on this volume?



  • OSR_Community_UserOSR_Community_User Member Posts: 110,217
    >If I'm using file system filter driver, can I obtain the VCB of volume or
    FCB of

    The part of FCB with the layout of FSRTL_COMMON_FCB_HEADER is
    pointed to by FileObject->FsContext.
    But it is not known where the real FCB begins -
    FSRTL_COMMON_FCB_HEADER can be at any offset inside the FCB.
    As about the VCB - it is the private FSD's data structure pointed to by the
    FCB. IO manager imposes no limitations on it.

Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Kernel Debugging 30 Mar 2020 OSR Seminar Space
Developing Minifilters 15 Jun 2020 LIVE ONLINE
Writing WDF Drivers 22 June 2020 LIVE ONLINE
Internals & Software Drivers 28 Sept 2020 Dulles, VA