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Re: [libvirt] [PATCH v7 2/6] add fuse support for libvirt lxc



On Tue, Nov 06, 2012 at 07:50:33PM +0800, Gao feng wrote:
> 于 2012年11月06日 17:11, Richard W.M. Jones 写道:
> > On Tue, Nov 06, 2012 at 04:54:59PM +0800, Gao feng wrote:
> >> Because libvirt_lxc create a thread to mount fuse filesystem.
> >> and then libvirt_lxc will try to access the fuse filesystem.
> >>
> >> Without waiting,libvirt_lxc may access fuse before it is mounted.
> >>
> >> And I can't find a better way to make accessing fuse after the fuse
> >> being mounted,because fuse_main will return until fuse being unmounted,so
> >> I don't know how to pass message to tell libvirt_lxc whether the fuse is
> >> mounted success.
> > 
> > Oh I see.  This is solvable, but I believe that you cannot use
> > fuse_main.  You have to look at the fuse sources (quite complex!)  and
> > do the individual fuse operations.
> > 
> > Have a look at how libguestfs does it ...
> > 
> >   https://github.com/libguestfs/libguestfs/blob/master/src/fuse.c#L911
> >   http://libguestfs.org/guestfs.3.html#mount-local
> > 
> 
> 
> Thanks for the information.
> 
> Can fuse_mount & fuse_new & fuse_loop avoid the waiting?
> 
> It seems has the same problem.

It waits, but it doesn't busy wait in a loop.  The first access to the
filesystem hangs until the thread which is handling the filesystem is
listening for requests.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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