linux-kernel - Re: [RFC][PATCH] netfs, afs, ceph: Use folios

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Message-ID: <3449254.1628842648@warthog.procyon.org.uk>
Date:   Fri, 13 Aug 2021 09:17:28 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     dhowells@...hat.com, Matthew Wilcox <willy@...radead.org>,
        Jeff Layton <jlayton@...nel.org>,
        Marc Dionne <marc.dionne@...istor.com>,
        Ilya Dryomov <idryomov@...il.com>,
        linux-afs@...ts.infradead.org, ceph-devel@...r.kernel.org,
        linux-cachefs@...hat.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC][PATCH] netfs, afs, ceph: Use folios

Christoph Hellwig <hch@...radead.org> wrote:

> It actually needs to go away.  There's not real good use for that level
> of API. netfs should just open code the releavant parts of
> generic_perform_write, similar to iomap.

I'm working on doing that in netfs lib, with the intent of sharing it between
at least afs, ceph, cifs and 9p.  It reduces the cost of accessing fscache
for large writes that span multiple pages.

David