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From: Pjotr Prins <pjotr.public12@thebird.nl>
Subject: Re: /gnu/store/.links/
Date: Fri, 9 Feb 2018 18:56:27 +0100
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To: Ludovic =?iso-8859-1?Q?Court=E8s?= <ludo@gnu.org>
Cc: Guix-devel <guix-devel@gnu.org>

On Fri, Feb 09, 2018 at 06:00:02PM +0100, Ludovic Court=C3=A8s wrote:
> In practice, when the maximum number of links is reached, we simply
> transparently skip deduplication.  See this commit:
>=20
>   commit 12b6c951cf5ca6055a22a2eec85665353f5510e5
>   Author: Ludovic Court=C3=A8s <ludo@gnu.org>
>   Date:   Fri Oct 28 20:34:15 2016 +0200
>=20
>       daemon: Do not error out when deduplication fails due to ENOSPC.
>=20
>       This solves a problem whereby if /gnu/store/.links had enough ent=
ries,
>       ext4's directory index would be full, leading to link(2) returnin=
g
>       ENOSPC.
>=20
>       * nix/libstore/optimise-store.cc (LocalStore::optimisePath_): Upo=
n
>       ENOSPC from link(2), print a message and return instead of throwi=
ng a
>       'SysError'.
>=20
> It does scale well, and it=E2=80=99s been here =E2=80=9Cforever=E2=80=9D=
.

OK. My mindset is probably ext2...

> If you=E2=80=99re wondering how much gets deduplicated, see
> <https://lists.gnu.org/archive/html/guix-devel/2014-09/msg00422.html>.
> :-)

Fancy that :)

Pj.