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    SubjectRe: [PATCH] get/set FAT filesystem attribute bits
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    On Tue, 2005-01-04 at 10:09 +0000, Anton Altaparmakov wrote:
    > > Nicholas Miell wrote:
    > > > On another note, NTFS-style xattrs (aka named streams) are unrelated to
    > > > Linux xattrs. A named stream is a separate file with a funny name, while
    > > > a Linux xattr is a named extension to struct stat.
    >
    > This is incorrect. NTFS has two different beasts:
    >
    [ why this is incorrect omitted for brevity ]
    >
    > One interesting bit of trivia is that Windows uses named streams very
    > extensively while it _never_ uses EAs. In fact I have never seen a
    > Windows OS or application that uses EAs. They were added to be
    > compatible with OS/2 EAs when it came out but since OS/2 died they now
    > just seem like old baggage/backwards compatibility in Windows that is no
    > longer used. (If anyone knows of a Windows application that uses EAs
    > please let me know. I would be most interested in knowing about it!)
    >

    This would probably explain why I've never heard of them. In my brief
    perusal of the MSDN Library in search of more information about these
    beasts, the only hint I could find related to their existence is in
    parameters to ZwCreateFile/NtCreateFile (which are themselves mostly
    undocumented). The high level file API certainly doesn't support their
    use, AFAICT.

    I think it's reasonably safe to assume that hpa's worry that FAT might
    get EAs in the future is unfounded. (Named streams is still a
    possibility, but I don't think Microsoft is all that interested in
    making improvements to a filesystem that people use so that they don't
    have to license NTFS.)

    > Hope this clears things up a bit as far as NTFS is concerned...
    >
    > I don't know what API would be best for accessing named streams on NTFS
    > but an xattrs like interface is not suitable IMO. You really want to be
    > able to open them and access them like normal files. An interface
    > similar to the Solaris openat() system call (see
    > http://docs.sun.com/app/docs/doc/816-0212/6m6nd4nc7?a=view) that has
    > been discussed on LKML before seems like a good way to deal with this
    > but I am more interested in getting normal write support into NTFS at
    > present than I am in fancy features like EAs and named streams...
    >

    Good luck with that.

    > Best regards,
    >
    > Anton
    --
    Nicholas Miell <nmiell@comcast.net>

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