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.