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


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:

Before Posting...

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

filter manager resets Iopb for rename operations before post-callback

Sergey_PisarevSergey_Pisarev Member - All Emails Posts: 275

Hello !
I am filtering rename operations. In pre-callback I clear ReplaceIfExists in both FLT_PARAMETERS for IRP_MJ_SET_INFORMATION and FILE_RENAME_INFORMATION. Call FltSetCallbackDataDirty.
Before my callback called filter manager sets Iopb in FLT_CALLBACK_DATA to new value.
In post-callback I have ReplaceIfExists in FLT_PARAMETERS for IRP_MJ_SET_INFORMATION set(by fltmgr) to TRUE(should be FALSE). ReplaceIfExists in FILE_RENAME_INFORMATION still set to FALSE(as expected).
Nothing changes if I don't call FltSetCallbackDataDirty.

Is that expected behaviour ? What should I do if I want to get correct modified value in post-callback ?


  • Dejan_MaksimovicDejan_Maksimovic Member - All Emails Posts: 434
    via Email
    You don't. This is expected behavior - you get the original data in
    the Iopb in your Post Operation callback. You need to save it
  • rod_widdowsonrod_widdowson Member - All Emails Posts: 1,191

    ... And it could be argued that is is beholden on you to put the FILE_RENAME_INFORMATION back the way you found 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!
Developing Minifilters 24 May 2021 Live, Online
Writing WDF Drivers 14 June 2021 Live, Online
Internals & Software Drivers 27 September 2021 Live, Online
Kernel Debugging TBD 2021 Live, Online