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

Home NTFSD
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: https://www.osr.com/osr-learning-library/


Re: How can I serve page fault requests asynchronously?

OSR_Community_UserOSR_Community_User Member Posts: 110,217
Perhaps I'm missing something....

Isn't the usual procedure that you get a read request and the calling process is stalled until you complete the IRP? So if you don't complete it, the IRP will hang around, possibly forever, making the process stop too. When you finally complete the IRP the process gets woken up. Since the file systems can handle multiple outstanding requests this shouldn't stop more than the one process.

In short, I don't see the problem.. which is why I think I must be missing something!

Andy


---- you wrote:
> Lets say that I wrote a file system driver (WinNT). Now lets suppose that a
> page fault occurs since a required page in memory was missing and that the
> device driver that I wrote receives the read request (after the I/O Manager
> directed the IRP to it).
> My question:
> How can I release the page fault exception WITHOUT bringing the required
> page! and of course cause the system NOT to run this process until I get
> the required page for it (and then somehow signal the system that the page
> is valid and that the process can be resumed). What I mean is: how can I
> serve page fault requests asynchronously?
> If this question requires a long reply, then please point me to a page in a
> book or a web link.
>
> Many thanks, Alon.
>
> ---
> You are currently subscribed to ntfsd as: [email protected]
> To unsubscribe send a blank email to $subst('Email.Unsub')
>


----------------------------------------------------------------
Get your free email from AltaVista at http://altavista.iname.com
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!
Writing WDF Drivers 7 Dec 2020 LIVE ONLINE
Internals & Software Drivers 25 Jan 2021 LIVE ONLINE
Developing Minifilters 8 March 2021 LIVE ONLINE