File Caching

NTFSD
1

Hi,

I’m new to file system drivers.
I have some doubts on file caching.

If I need to store a file in system buffer(Cache) I think the file
should be opened with the flag IRP_NOCACHE not being set.How do I
issue a open call or read call from the user level informing the I/o
manager that this flag is not being set?Kindly provide little
information on File Caching.

Regards,
Gayu

2

Cached access is the default file access mode, so no special flag needs
to be set when the file is opened. If you want to open a file for
non-cached IO, also called unbuffered IO, you specify
FILE_FLAG_NO_BUFFERING in the dwFlagsAndAttributes parameter to
CreateFile().

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 gayatri gayatri
Sent: Thursday, January 20, 2005 10:48 PM
To: Windows File Systems Devs Interest List
Subject: [ntfsd] File Caching

Hi,

I’m new to file system drivers.
I have some doubts on file caching.

If I need to store a file in system buffer(Cache) I think the file
should be opened with the flag IRP_NOCACHE not being set.How do I issue
a open call or read call from the user level informing the I/o manager
that this flag is not being set?Kindly provide little information on
File Caching.

Regards,
Gayu

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

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