linux-kernel - Re: [GIT PULL] fscache rewrite -- please drop for now

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Message-ID: <1428311.1598542135@warthog.procyon.org.uk>
Date:   Thu, 27 Aug 2020 16:28:55 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     dhowells@...hat.com, Alexander Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>,
        Jeff Layton <jlayton@...hat.com>,
        Dave Wysochanski <dwysocha@...hat.com>,
        Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Eric Van Hensbergen <ericvh@...il.com>,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] fscache rewrite -- please drop for now

Christoph Hellwig <hch@....de> wrote:

> FYI, a giant rewrite dropping support for existing consumer is always
> rather awkward.  Is there any way you could pre-stage some infrastructure
> changes, and then do a temporary fscache2, which could then be renamed
> back to fscache once everyone switched over?

That's a bit tricky.  There are three points that would have to be shared: the
userspace miscdev interface, the backing filesystem and the single index tree.

It's probably easier to just have a go at converting 9P and cifs.  Making the
old and new APIs share would be a fairly hefty undertaking in its own right.

David