IRQL-Related Constraints?

NTFSD
1

I have a question on some of the IFSkit docs, brought on by the previous
conversation. In the IFS kit docs for dispatch routine constraints it
states:

“IRQL-Related Constraints”

"Dispatch routines in the paging path, such as read and write, cannot safely
call any kernel-mode routines that require callers to be running at IRQL
PASSIVE_LEVEL.

Dispatch routines that are in the paging file I/O path cannot safely call
any kernel-mode routines that require a caller to be running at IRQL <
DISPATCH_LEVEL."

I’m assuming this means that the “paging path” in the first statement simply
means paging I/O to normal files, and the “paging file I/O” path in the
second statement means paging I/O to the actual page file. Can anyone
definitively say if my interpretation is correct?

Thanks,
Matt

2

Yes, your interpretation is correct.

Molly Brown
Microsoft Corporation

This posting is provided “AS IS” with no warranties and confers no
rights.

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Matthew N. White
Sent: Thursday, January 15, 2004 7:06 AM
To: Windows File Systems Devs Interest List
Subject: [ntfsd] IRQL-Related Constraints?

I have a question on some of the IFSkit docs, brought on by the previous
conversation. In the IFS kit docs for dispatch routine constraints it
states:

“IRQL-Related Constraints”

"Dispatch routines in the paging path, such as read and write, cannot
safely call any kernel-mode routines that require callers to be running
at IRQL PASSIVE_LEVEL.

Dispatch routines that are in the paging file I/O path cannot safely
call any kernel-mode routines that require a caller to be running at
IRQL < DISPATCH_LEVEL."

I’m assuming this means that the “paging path” in the first statement
simply means paging I/O to normal files, and the “paging file I/O” path
in the second statement means paging I/O to the actual page file. Can
anyone definitively say if my interpretation is correct?

Thanks,
Matt

Questions? First check the IFS FAQ at
https://www.osronline.com/article.cfm?id=17

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