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

[Dave Chinner]

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."

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com