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Date:   Tue, 29 Jun 2021 14:34:54 -0400
From:   "bfields@fieldses.org" <bfields@fieldses.org>
To:     Amir Goldstein <amir73il@gmail.com>
Cc:     NeilBrown <neilb@suse.de>,
        Trond Myklebust <trondmy@hammerspace.com>,
        "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
        "dai.ngo@oracle.com" <dai.ngo@oracle.com>,
        "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>
Subject: Re: automatic freeing of space on ENOSPC
Message-ID: <20210629183454.GB1926@fieldses.org>
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On Tue, Jun 29, 2021 at 07:07:47AM +0300, Amir Goldstein wrote:
> To me, stale silly renamed files sounds like a problem worth fixing
> not as an excuse to create another similar problem.

Yeah, it's ugly, I'd like to fix it some day, but given that people have
lived with it since forever it's not the highest priority.

> w.r.t pre-ENOSPC notification, I don't know of such notification
> in filesystems. It exists for some thin-provisioned storage devices
> (thinp as well I think), but that is not very useful for nfsd.
> 
> OTOH, ENOSPC is rarely a surprising event.
> I believe you can get away with tunable for nfsd, such as
> % of available storage space that may consumed for
> "opportunistic caching".
> 
> Polling for available storage space every least time or so
> in case there are possibly forgotten unlinked files should be
> sufficient for any practical purpose IMO.

Makes sense, thanks for the perspective.

--b.