linux-kernel - Re: [PATCH v6 2/2] fuse: add new function to invalidate cache for all inodes

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Message-ID: <CAJfpegu51xNUKURj5rKSM5-SYZ6pn-+ZCH0d-g6PZ8vBQYsUSQ@mail.gmail.com>
Date: Tue, 18 Feb 2025 11:34:53 +0100
From: Miklos Szeredi <miklos@...redi.hu>
To: Luis Henriques <luis@...lia.com>
Cc: Dave Chinner <david@...morbit.com>, Bernd Schubert <bschubert@....com>, 
	Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
	Matt Harvey <mharvey@...ptrading.com>, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/2] fuse: add new function to invalidate cache for all inodes

On Tue, 18 Feb 2025 at 11:04, Luis Henriques <luis@...lia.com> wrote:

> The problem I'm trying to solve is that, if a filesystem wants to ask the
> kernel to get rid of all inodes, it has to request the kernel to forget
> each one, individually.  The specific filesystem I'm looking at is CVMFS,
> which is a read-only filesystem that needs to be able to update the full
> set of filesystem objects when a new generation snapshot becomes
> available.

Yeah, we talked about this use case.  As I remember there was a
proposal to set an epoch, marking all objects for "revalidate needed",
which I think is a better solution to the CVMFS problem, than just
getting rid of unused objects.

Thanks,
Miklos