[Devel] [PATCH 05/11] fuse: Trust kernel i_mtime only -v2

[Miklos Szeredi]

On Thu, Dec 26, 2013 at 07:41:41PM +0400, Maxim Patlasov wrote:
> >>+
> >>+	if (!err)
> >>+		clear_bit(FUSE_I_MTIME_DIRTY, &fi->state);
> >Doing the test and the clear separately opens a huge race window when i_mtime
> >modifications are bound to get lost.
> 
> No. Because the whole operation is protected by i_mutex (see
> fuse_fsync_common()).

fuse_release_common() doesn't have i_mutex.  It's probably safe to acquire it,
but is that really needed?

Thanks,
Miklos