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From:
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Reply To: xxxxx@lists.osr.com
Sent: Tuesday, February 04, 2003 1:58 AM
To: xxxxx@lists.osr.com
Subject: [ntfsd] RE: How can I get the current dirctory in a file
system filter driver?It is only valid to look at the FileName and RelatedFileObject fields of
a FILE_OBJECT structure during pre-create. These fields are not
necessarily valid at any other time.
Is RelatedFileObject->FileName always valid in pre-create path?
I’m just investigating IFS (XP SP1) examples to find how to get canonical
name in pre-create path and have to say I’m a bit confused. SFilter accesses
RelatedFileObject->FileName directly (post-create when open fails) whereas
FileSpy queries for FileNameInfo. There is a comment (fspylib.c / 1272)
which explains it is because RelatedFileObject may be also relative. Well,
so why don’t use relative name directly if it isn’t?
The comment is also misleading because tells about using ObQueryNameString()
and is followed by call of SpyQueryFileSystemForFileName() which contains
following comment “ObQueryNameString CANNOT be used here…”
Can somebody explain when is RelatedFileObject created and give an example
of real situation when it can be relative to the other one?
Thanks.
Best regards,
Michal Vodicka
STMicroelectronics Design and Application s.r.o.
[michal.vodicka@st.com, http:://www.st.com]