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Re: [Libguestfs] virt-sysprep future

On Mon, Mar 26, 2012 at 02:06:52PM +0100, Richard W.M. Jones wrote:
> On Mon, Mar 26, 2012 at 10:00:53AM +0100, Richard W.M. Jones wrote:
> > (1) We add FUSE support directly to the API, linking with libfuse.
> > This is essentially the same as what was outlined in link [i] back in
> > December 2011.
> [...]
> > The problem with (1) is that we are not confident that it's a good
> > idea to use libfuse as a true library.  It doesn't appear that anyone
> > else is using it this way.
> I'll also add that libfuse makes it tricky to use multiple handles.
> Specifically, FUSE callbacks get no context at all, eg: getattr's
> parameters are:
>   static int getattr (const char *path, struct stat *statbuf);
> If libfuse could be called from multiple threads, each with its own
> handle, then how would you know which handle to use?  (The answer
> possibly involves using thread-local storage, but that's hairy if
> either handle is multithreaded).

Actually I'm wrong about this.  Turns out there is a 'fuse_context'
call that you can make within handlers which returns the context.


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming blog: http://rwmj.wordpress.com
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