[ros-kernel] Re: XFS Filesystem?

[Frank D. E. Jr. <fd...@ya...>]

It would still be better than FAT, and from a performance standpoint
(and the POSIX subsystem whenever that comes around)...

--- Phillip Susi <ps...@cf...> wrote:
> Any effort to port a unix filesystem to reactos would not fit
> semantically 
> into the OS right.  Specifically, even a unix with ACLs does not fit
> into 
> the NT security model.  Unix ACLs still only allow specifying 
> read/write/execute permissions to be set on security entities, and I
> doubt 
> that the security identifier is more than just a 32 bit integer,
> which is 
> not enough to represent an NT SID, which is typically 128 bits (
> though it 
> can be of any length ).  NTFS stores arbitrary security descriptors
> which 
> allows it to hold current and future NT security descriptors.  NT
> security 
> descriptors are extensible, and MS has already added capabilities to 
> specify how a given ACE is to be applied: to the directory, files in
> the 
> directory, children directories, files in those directories, or all
> of the 
> above.  In theory it is possible to extend security descriptors to
> use 
> mandatory access control, which is to specify to whom what
> permissions may 
> be granted by those with rights to modify the ACL.  An inherited
> rights 
> mask like netware has is also possible.  I'd also like to have
> deleted file 
> salvage/purge support like netware.
> 
> In short, a unix filesystem won't port well to reactos due to
> differing 
> semantics.  NTFS really is a very powerful and highly extensible 
> filesystem, whose capabilities are not fully exploited by Microsoft's
> 
> current OSes.  I'd like to have reactos exploit more of these
> capabilities, 
> though with win2k it seems that MS is beginning to exploit some of
> them 
> with things like reparse points, which allow EFS and offline files. 
> Named 
> data streams are also used to store extra information on the file 
> properties tab in explorer for the author of the file, subject, etc. 
> NTFS 
> can even index files by such extended information instead of just the
> name 
> of the file, as is currently done.  NTFS performance could also be
> much 
> better than MIcrosoft's implementations: performance problems ( such
> as 
> being prone to fragmentation ) are due to the driver, not the on disk
> 
> filesystem.
> 
> At 09:27 AM 9/24/2001 -0700, you wrote:
> >SGI's XFS filesystem is available as an Open-Source project (GPL)
> for
> >Linux.  How difficult is it to port a Linux filesystem driver to
> >ReactOS?
> >
> >This filesystem has journaling capabilities, and may be of benefit
> to
> >many users.  I believe it has ACL support, as well.
> >
> >Thus, it may be worth consideration for a future project within
> >ReactOS, if it can be ported easily enough.
> >
> >=====
> >=======
> >Frank D. Engel, Jr.
> >Please note my new address: fd...@ya...
> 
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=====
=======
Frank D. Engel, Jr.
Please note my new address: fd...@ya...

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