[Virtio-fs] [PATCH] virtiofsd: enable PARALLEL_DIROPS during INIT

[Miklos Szeredi]

On Fri, Jun 7, 2019 at 8:33 PM Dr. David Alan Gilbert
<dgilbert at redhat.com> wrote:
>
> * Liu Bo (bo.liu at linux.alibaba.com) wrote:
> > On Fri, Jun 07, 2019 at 04:21:47PM +0100, Dr. David Alan Gilbert wrote:
> > > * Liu Bo (bo.liu at linux.alibaba.com) wrote:
> > > > lookup is a RO operations, PARALLEL_DIROPS can be enabled.
> > > >
> > > > Signed-off-by: Liu Bo <bo.liu at linux.alibaba.com>
> > >
> > > I'm not too sure what this is doing; and why doesn't upstream libfuse
> > > have this?
> >
> > I'm not sure why libfuse doesn't include the capability, but AFAICT this
> > is needed for practical use.
>
> Miklos: Do you know what the rules are around PARALLEL_DIROPS and why
> the upstream libfuse doesn't have it eanbled?

Not sure why libfuse3 wouldn't have it enabled by default, probably an
omission.  Having said that, the reason this is opt in is that old
filesystems might rely on the serialized behavior, so back
compatibility requires that we have this turned off by default, so now
libfuse3 has the same problem...

Thanks,
Miklos