From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: nfs exports & bind mounts
Date: Sat, 10 Nov 2007 17:29:56 -0500
Message-ID: <1194733796.15122.27.camel@heimdal.trondhjem.org>
References: <2077779951@web.de>
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Cc: NFS@lists.sourceforge.net
To: devzero@web.de
In-Reply-To: <2077779951@web.de>
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On Sat, 2007-11-10 at 22:36 +0100, devzero@web.de wrote:
> Hi !
> 
> i think everybody knows bind mounts.
> 
> i can do:
> 
> touch /otherpath/dummyfile
> mount -bind /path/file /otherpath/dummyfile
> 
> so /path/file becomes accessible via /otherpath/dummyfile - dummyfile has the same size as file after successful bind-mount
> 
> i can loopback-mount /otherpath/dummyfile to /otherpath/mnt if file/dummyfile contains a filesystem
> 
> when i export /otherpath via nfs (crossmnt), from the client side i can access the contents of the filesystem inside file/dummyfile via /otherpath/mnt  - but i cannot access the contents of dummyfile itself, i.e. the bind-mount seems to get lost on export.
> 
> can someone tell if this is expected behaviour or if this is a bug ?

The NFS client will not cross a mount point unless the target is a
directory. That is not a bug, it is expected behaviour.

Trond


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