All this talk about stream contexts has made me realize that I’m sort of
reinventing the wheel over here. Instead of managing this stuff myself,
I think I’d be better off using StreamContexts. The docs say that the
Flt*StreamContext functions can return STATUS_NOT_SUPPORTED if the FS
doesn’t support per-stream contexts, but I can’t find documentation
telling me which filesystems do support them. I’m only attaching to
NTFS filesystems at the moment because we’re using reparse points, and
only ntfs supports that feature.
Do I run a real risk of having painted myself into a corner using stream
contexts if I run into another FS that supports RPs but not stream
contexts, or is that a very unlikely scenario?
~Eric
“Contexts and 3rd party file systems…All Microsoft file systems now use
this”
Taken from here:
http://download.microsoft.com/download/f/0/5/f05a42ce-575b-4c60-82d6-208d3754b2d6/ContextManagement.ppt
I assume that *every* established 3rd party FS-driver supports it, too. If
not…it’s not worth being filtered 
“Eric Diven” wrote news:xxxxx@ntfsd…
All this talk about stream contexts has made me realize that I’m sort of
reinventing the wheel over here. Instead of managing this stuff myself,
I think I’d be better off using StreamContexts. The docs say that the
Flt*StreamContext functions can return STATUS_NOT_SUPPORTED if the FS
doesn’t support per-stream contexts, but I can’t find documentation
telling me which filesystems do support them. I’m only attaching to
NTFS filesystems at the moment because we’re using reparse points, and
only ntfs supports that feature.
Do I run a real risk of having painted myself into a corner using stream
contexts if I run into another FS that supports RPs but not stream
contexts, or is that a very unlikely scenario?
~Eric
Actually, there are a probably a number of 3rd party file systems that do
not support it. Remember this only works with the FSRTL_ADVANCED_FCB_HEADER
which is a fairly recent (last few years) capability. I suspect that a
number of file systems have not gotten around to changing their FCB’s to
support this.
Whether this is important is something only the OP can decide.
–
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
Remove StopSpam to reply
“frank” wrote in message news:xxxxx@ntfsd…
> “Contexts and 3rd party file systems…All Microsoft file systems now use
> this”
>
> Taken from here:
>
> http://download.microsoft.com/download/f/0/5/f05a42ce-575b-4c60-82d6-208d3754b2d6/ContextManagement.ppt
>
> I assume that every established 3rd party FS-driver supports it, too. If
> not…it’s not worth being filtered
>
>
>
> “Eric Diven” wrote news:xxxxx@ntfsd…
> All this talk about stream contexts has made me realize that I’m sort of
> reinventing the wheel over here. Instead of managing this stuff myself,
> I think I’d be better off using StreamContexts. The docs say that the
> Flt*StreamContext functions can return STATUS_NOT_SUPPORTED if the FS
> doesn’t support per-stream contexts, but I can’t find documentation
> telling me which filesystems do support them. I’m only attaching to
> NTFS filesystems at the moment because we’re using reparse points, and
> only ntfs supports that feature.
>
> Do I run a real risk of having painted myself into a corner using stream
> contexts if I run into another FS that supports RPs but not stream
> contexts, or is that a very unlikely scenario?
>
> ~Eric
>
>
>
Novell doesn’t support it (as if this is the least of worries filtering Novell :D)
Not all files support contexts even on NTFS. For example Page/Hiberfile.
frank wrote:
“Contexts and 3rd party file systems…All Microsoft file systems now use
this”
Taken from here:
http://download.microsoft.com/download/f/0/5/f05a42ce-575b-4c60-82d6-208d3754b2d6/ContextManagement.ppt
I assume that *every* established 3rd party FS-driver supports it, too. If
not…it’s not worth being filtered
“Eric Diven” wrote news:xxxxx@ntfsd…
> All this talk about stream contexts has made me realize that I’m sort of
> reinventing the wheel over here. Instead of managing this stuff myself,
> I think I’d be better off using StreamContexts. The docs say that the
> Flt*StreamContext functions can return STATUS_NOT_SUPPORTED if the FS
> doesn’t support per-stream contexts, but I can’t find documentation
> telling me which filesystems do support them. I’m only attaching to
> NTFS filesystems at the moment because we’re using reparse points, and
> only ntfs supports that feature.
>
> Do I run a real risk of having painted myself into a corner using stream
> contexts if I run into another FS that supports RPs but not stream
> contexts, or is that a very unlikely scenario?
>
> ~Eric
>
> —
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