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Date:      Tue, 4 Jun 2019 00:15:33 +0300
From:      Konstantin Belousov <kostikbel@gmail.com>
To:        Alan Somers <asomers@freebsd.org>
Cc:        FreeBSD Hackers <freebsd-hackers@freebsd.org>
Subject:   Re: How to VOP_RECLAIM on demand?
Message-ID:  <20190603211533.GS75280@kib.kiev.ua>
In-Reply-To: <CAOtMX2h9zdwczP3ZEawHHQgnutu6G9kqvHOO9dCW%2BX-N1zoYkw@mail.gmail.com>
References:  <CAOtMX2h9zdwczP3ZEawHHQgnutu6G9kqvHOO9dCW%2BX-N1zoYkw@mail.gmail.com>

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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.



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