On Wed, Dec 06, 2006 at 09:53:39AM -0600, Rob Ross wrote:
quoted text
> David Chinner wrote:
> >Does anyone here know about the XFS libhandle API? This has been
> >around for years and it does _exactly_ what these proposed syscalls
> >are supposed to do (and more).
> 
> Thanks for pointing these out Dave. These are indeed along the same 
> lines as the openg()/openfh() approach.
> 
> One difference is that they appear to perform permission checking on the 
> open_by_handle(), which means that the entire path needs to be encoded 
> in the handle, and makes it difficult to eliminate the path traversal 
> overhead on N open_by_handle() operations.

Another (and highly important) difference is that usage is restricted to
root:

xfs_open_by_handle(...)
...
        if (!capable(CAP_SYS_ADMIN))
		return -XFS_ERROR(EPERM);

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