RE: [autofs] 2.4.20 autofs4 changes

From: Ogden, Aaron A. (
Date: Mon Feb 10 2003 - 10:22:24 EST

Hello Ian,
I think the 'ghosting' feature is vital to interoperability between Linux
and Solaris systems. Sun calls this feature 'browsing' and Solaris has had
it for some time. I don't believe that Irix, AIX and other Unices have this
ability, so it would be a big plus if Linux could do it. I'm surprised that
this feature hasn't made it into the autofs kernel module yet, it would seem
to be a feature that would be widely used.

I can't speak for anybody else but I would very much like to keep up with
current developments on the autofs list. (isn't that the point of a mailing
list? :-) )


-----Original Message-----
From: Ian Kent []
Sent: Monday, February 10, 2003 8:43 AM
Subject: [autofs] 2.4.20 autofs4 changes

Hi all,

I have written a patch for the autofs4 kernel module (and autofs
4.0.0-pre10 daemon) to deal with ghosting of directories (and to a
limited degree, direct automount maps). Refer to for
more information if you wish.

There have been a few changes to the autofs4 module in kernel release
2.4.20 that break this patch. I have looked through the Changelog for
2.4.20 and 2.4.19 and don't see any reference to the changes. I have
also had a brief look through the archives of this list without success.

A first look indicates that the problem for me has been caused by the
removal of the file_operations definition autofs4_dir_operations in
root.c. Then the dcache default file_operations are used for inode
initialization in inode.c instead. My initial impression is that if
there is a specific reason for using the dcache default then I will need
to work on an autofs4 implementation of dcache_dir_lseek. The rest may
be OK.

To save me some time and possible pain I am hoping to find out the
reasoning behind this change from the implementor. Please copy any reply
to my personal email address as I am not subscribed to this list. I
think that the autofs list is closed to people who are not subscribed so
I will forward any replies that don't make it there.

Should notification of these changes be posted to the autofs list?

Ian Kent <>

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