How to VOP_RECLAIM on demand?
Konstantin Belousov
kostikbel at gmail.com
Mon Jun 3 22:54:51 UTC 2019
On Mon, Jun 03, 2019 at 04:27:26PM -0600, Alan Somers wrote:
> On Mon, Jun 3, 2019 at 3:15 PM Konstantin Belousov <kostikbel at gmail.com> wrote:
> >
> > On Mon, Jun 03, 2019 at 02:38:11PM -0600, Alan Somers wrote:
> > > It would be useful if I could trigger VOP_RECLAIM on demand for a
> > > certain file or pathname. There are some edge cases in fusefs that I
> > > can't test otherwise. But I don't see any way to do it. Is such a
> > > thing possible? Would it be worth adding a special syscall for this
> > > purpose? It could be guarded with INVARIANTS so it wouldn't affect
> > > production builds.
> >
> > Look at revoke(2) and VOP_REVOKE(). It is only implemented and used
> > for devfs tty nodes.
>
> I don't understand how that would help. What does VOP_REVOKE have in
> common with VOP_RECLAIM?
Sane implementation of VOP_REVOKE for a filesystem that does not do tricks
at files level (think devfs) is mostly {vgone(vp);}.
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