linux-kernel - Re: [PATCH 2/2] fs: Move swap_[de]activate to file

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Date:   Mon, 11 Nov 2019 22:55:07 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     ira.weiny@...el.com
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org, Dave Chinner <david@...morbit.com>,
        Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 2/2] fs: Move swap_[de]activate to file_operations

On Mon, Nov 11, 2019 at 04:34:52PM -0800, ira.weiny@...el.com wrote:
> From: Ira Weiny <ira.weiny@...el.com>
> 
> swap_activate() and swap_deactivate() have nothing to do with
> address spaces.  We want to eventually make the address space operations
> dynamic to switch inode flags on the fly.  So to simplify this code as
> well as properly track these operations we move these functions to the
> file_operations vector.

What is the point?  If we switch aops for DAX vs not we might as well
switch file operations as well, as they pretty much are entirely
different.