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

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Message-ID: <20191112133348.GJ1241@quack2.suse.cz>
Date:   Tue, 12 Nov 2019 14:33:48 +0100
From:   Jan Kara <jack@...e.cz>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     ira.weiny@...el.com, Alexander Viro <viro@...iv.linux.org.uk>,
        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 11-11-19 16:43:20, Andrew Morton wrote:
> On Mon, 11 Nov 2019 16:34:52 -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.
> 
> What does this mean?

See my reply to Christoph [1]. Ira wants to make switching inodes between
DAX and non-DAX mode work which means switching also
address_space_operations pointer in the mapping. 

								Honza

[1] lore.kernel.org/r/20191112133055.GI1241@...ck2.suse.cz

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR