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    SubjectRe: reiser4 (was Re: [PATCH] Revised extended attributes interface)
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    On Thu, Dec 13, 2001 at 12:23:46PM +0300, Hans Reiser wrote:
    > Andrew Pimlott wrote:
    > >First, I write a desktop application that wants to save an HTML file
    > >along with some other object that contains the name of the creating
    > >application. The latter can go anywhere you want, except in the
    > >same stream as the HTML file. The user has requested that the
    > >filename be /home/user/foo.html , and expects to be able to FTP this
    > >file to his ISP with a standard FTP program. What calls does my
    > >application make to store the HTML and the application name? If the
    > >answer is different depending on whether /home/user is NTFS or
    > >reiserfs4, explain both ways.
    > >
    > Are you sure that standard ftp will be able to handle extended
    > attributes without modification?

    No, the ftp program only needs to transfer the HTML part.

    > One approach is to create a plugin called ..archive that when read is a
    > virtual file consisting of an archive of everything in the directory.

    Ok, does this mean that every directory in the filesystem (or in
    some part of it) will automatically have a node ..archive?
    Presumably, it will not appear in directory listings, but can be
    read but not written to? Does this mean that a legacy application
    (pathological as it may be) that expects to be able to create a file
    called ..archive will fail?

    Or do you mean that the application would explicitly create the node
    associated with this plugin?

    > It would be interesting I think to attach said plugin to standard
    > directories by default along with several other standard plugins like
    > ..cat, etc.

    Anyway, you didn't answer the part I really care about. What calls
    does the application make to store the HTML and the "extended
    attribute"? You can pick whatever conventions you want, just give
    me an example.

    > >Second, I booted NT and created a directory in the NTFS filesystem
    > >called /foo . In the directory, I created a file called bar. I
    > >also created a named stream called bar, and an extended attribute
    > >called bar. Now I boot Linux. What calls do I make to see each of
    > >the three objects called bar?
    > >
    >
    > You access /foo/bar, /foo/bar/,,bar, /foo/..bar by name.

    How do I access the file called ..bar (created in NT) in the
    directory /foo?

    (Anton, does NTFS define any reserved filename characters, or only
    win32?)

    Andrew
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