Hi,
I am writing text data to a memory map and opening it in notepad. I see the
text in multiple columns of lines if the buffersize I choose is less than
1024 Bytes. Using 1K Buffer for a line of data is quite a waste for me since
most of the times the line-size is within 256 bytes.
Any reasons/suggestions are highly appreciated.
-Narendra
----- Original Message -----
From: “Alexey Logachyov”
To: “File Systems Developers”
Sent: Friday, March 14, 2003 6:39 AM
Subject: [ntfsd] Re: More on IoCancelFileOpen
> This piece of code is working for me, so I never tried to make it another
> way.
>
> ----- Original Message -----
> From: “Ampsi”
> To: “File Systems Developers”
> Sent: Thursday, March 13, 2003 4:03 AM
> Subject: [ntfsd] Re: More on IoCancelFileOpen
>
>
> > if i call CcFlushCache, then CcPurgeCacheSection followed by
> > CcUninitializeCacheMap, without MmFlushImageSection, will the effect be
> > drastically different?
> >
> > btw, is MmFlushImageSection necessary if CcFlushCache is called? i
thought
> > the image section is part of the cache?
> >
> > Ampsi
> >
> > ----- Original Message -----
> > From: “Alexey Logachyov”
> > To: “File Systems Developers”
> > Sent: Thursday, March 13, 2003 01:26
> > Subject: [ntfsd] Re: More on IoCancelFileOpen
> >
> >
> > // Uninitialize FO caching.
> >
> > CcUninitializeCacheMap(FileObjectPtr, NULL, NULL);
> >
> > // Flush cache.
> >
> > CcFlushCache(&FcbPtr->SectionObjectPointers, NULL, 0, NULL);
> >
> > // Flush image section if there is one.
> >
> > if (FcbPtr->SectionObjectPointers.ImageSectionObject)
> > {
> > MmFlushImageSection(&FcbPtr->SectionObjectPointers,
MmFlushForWrite);
> > }
> >
> > // Purge cache section if there is one.
> >
> > if (FcbPtr->SectionObjectPointers.DataSectionObject)
> > {
> > CcPurgeCacheSection(&FcbPtr->SectionObjectPointers, NULL, 0, FALSE);
> > }
> >
> >
> >
> > ----- Original Message -----
> > From:
> > To: “File Systems Developers”
> > Sent: Friday, March 07, 2003 11:38 AM
> > Subject: [ntfsd] More on IoCancelFileOpen
> >
> >
> > >
> > > Does anyone know a way of getting the cache manager to dereference a
> file
> > > object quickly before a call to IoCancelFileOpen?
> > >
> > > Our filter driver is intercepting creates - passing the irp down to
the
> > > file system - and synchronising back to the original context via the
> > > completion routine. It then uses the resulting file object to do read
> > > operations. On the basis of those operations we may decide to cancel
> the
> > > create request and we do this via IoCancelFileOpen.
> > > At this point there are usually 3 outstanding references (I assume 2
are
> > > cache manager and 1 is iomanger) on the file object. Calling
> > > CcPurgeCacheSection causes the cache manager to dereference the file
> > > object, but there seems to be quite a delay - of at least one second
> > > between the call to CcPurgeCacheSection and the references actually
> > > disappearing.
> > >
> > > Is there a better way of getting the cache manager to drop the
> references?
> > >
> > > Thanks
> > >
> > > –
> > > Steven Braggs, Software Engineer, Sophos Anti-Virus
> > > Email: xxxxx@sophos.com, Tel: 01235 559933, Web: www.sophos.com
> > > Add live virus info to your website: http://www.sophos.com/link/vfeed
> > >
> > >
> > >
> > >
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