linux-kernel - Re: [PATCH 10/12] fscache: Fix cookie key hashing

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Date:   Wed, 25 Aug 2021 15:04:08 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jeff Layton <jlayton@...hat.com>
Cc:     dhowells@...hat.com, linux-cachefs@...hat.com,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        David Wysochanski <dwysocha@...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: [PATCH 10/12] fscache: Fix cookie key hashing

Jeff Layton <jlayton@...hat.com> wrote:

> What happens when this patch encounters a cache that was built before
> it? Do you need to couple this with some sort of global cache
> invalidation or rehashing event?

At the moment, nothing.  cachefiles generates a second hash value, but doing
so is a duplication of effort.

David