linux-kernel - Re: [PATCH v2 00/53] fscache: Rewrite index API and management system

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Date:   Fri, 22 Oct 2021 09:21:15 -1000
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        Marc Dionne <marc.dionne@...istor.com>,
        Eric Van Hensbergen <ericvh@...il.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Dave Wysochanski <dwysocha@...hat.com>,
        CIFS <linux-cifs@...r.kernel.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Steve French <sfrench@...ba.org>,
        Shyam Prasad N <nspmangalore@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        Anna Schumaker <anna.schumaker@...app.com>,
        "open list:NFS, SUNRPC, AND..." <linux-nfs@...r.kernel.org>,
        Latchesar Ionkov <lucho@...kov.net>,
        v9fs-developer@...ts.sourceforge.net,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Trond Myklebust <trondmy@...merspace.com>,
        Jeff Layton <jlayton@...nel.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Omar Sandoval <osandov@...ndov.com>,
        ceph-devel@...r.kernel.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 00/53] fscache: Rewrite index API and management system

On Fri, Oct 22, 2021 at 8:58 AM David Howells <dhowells@...hat.com> wrote:
>
> David Howells (52):
>       fscache_old: Move the old fscache driver to one side
>       fscache_old: Rename CONFIG_FSCACHE* to CONFIG_FSCACHE_OLD*
>       cachefiles_old:  Move the old cachefiles driver to one side

Honestly, I don't see the point of this when it ends up just being
dead code basically immediately.

You don't actually support picking one or the other at build time,
just a hard switch-over.

That makes the old fscache driver useless. You can't say "use the old
one because I don't trust the new". You just have a legacy
implementation with no users.

              Linus