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Re: xfsprogs/libhandle : How to get the handle for a symbolic link ?

To: DENIEL Philippe <philippe.deniel@xxxxxx>
Subject: Re: xfsprogs/libhandle : How to get the handle for a symbolic link ?
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 2 Jun 2010 09:29:17 +1000
Cc: xfs@xxxxxxxxxxx
In-reply-to: <4C04F386.908@xxxxxx>
References: <4C04F386.908@xxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Tue, Jun 01, 2010 at 01:48:22PM +0200, DENIEL Philippe wrote:
> Hi,
> I am currently developing a user space nfs server with various
> backends. One of this backend module use xfsprogss's libhandle to
> implement XFS support. I could do almost everything with
> open_by_handle and fd_to_handle, used jointly with ATFILE_SOURCE
> functions, but I do have a problem with symbolic links. To build an
> xfs object's handle, I get its parent handle (now problem to this)
> then I call "openat" to get the fd to the object before calling
> fd_to_handle. This works ok, but not for symbolic link : the openat
> with follow the link. I added the O_NOFOLLOW flag to openat, but now
> openat return ELOOP instead.
> I know there is a readlink_by_handle function in libhandle. How
> could I build the related handle to be used as argument to it (I
> mean, how to build a handle that refers to the symlink itself, not
> the object it points to).

Doesn't path_to_handle() do what you want? From the man page:

        "... If the final component of the path name is a symbolic
        link, the handle returned is that of the link itself."


Dave Chinner

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