Date: Sun, 1 Jan 2017 14:58:17 +0100
From: Christoph Hellwig <hch@lst.de>
To: Bruce James Fields <bfields@fieldses.org>
Cc: Trond Myklebust <trondmy@gmail.com>, linux-nfs@vger.kernel.org
Subject: Re: [nfsv4] RFC 7530: Filehandle of opened file after the REMOVE
Message-ID: <20170101135817.GA18418@lst.de>
References: <CADaq8jcq2C0o8EWXoGjxDn58sV_J+-SP-=rj934Se-DV69b-pw@mail.gmail.com> <20161214112112.Horde.aPh8AjT6iWRl37CULwihyV7@mail.telka.sk> <CAABAsM7v6y0bsb0jKzfvobkUjniTLhM3uv8FYjo07HcLD2004w@mail.gmail.com> <20161227144414.GA32002@fieldses.org> <CADaq8jck14SKL6Ua9QxbqPyX1=1aaA7+76wv-__EWFvh7ZcEJA@mail.gmail.com> <C496AE44-0F27-4B66-A1F6-A76AEAFD7A90@gmail.com> <20161229024703.GA21325@fieldses.org> <20161229074830.GA3002@lst.de> <20161229205426.GA389@fieldses.org> <20161230083530.GA26413@lst.de>
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Sender: linux-nfs-owner@vger.kernel.org

Btw, thinking about this a bit more the simplest thing possible would be a
mount option to delay reclaiming unlinked inodes for N seconds, set to the
NFS gracce periods plus a reasonable slack for starting NFSD after mounting
the fs.  This would be fairly easily to implement in the fs, does not
require tight coupling between the fs and NFSD, and will eventually reclaim
the unlinked inodes even if the file system happens to not be exported at
all. 

I could implement this quickly if you want to play around with the NFSD
side.