linux-ext4 - Re: [PATCH 15/20] balloon: Convert to migrate

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Date:   Tue, 7 Jun 2022 15:24:15 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-aio@...ck.org,
        linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-mm@...ck.org, linux-xfs@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-ntfs-dev@...ts.sourceforge.net,
        ocfs2-devel@....oracle.com, linux-mtd@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 15/20] balloon: Convert to migrate_folio

On Tue, Jun 07, 2022 at 09:36:21AM +0200, David Hildenbrand wrote:
> On 06.06.22 22:40, Matthew Wilcox (Oracle) wrote:
> >  const struct address_space_operations balloon_aops = {
> > -	.migratepage = balloon_page_migrate,
> > +	.migrate_folio = balloon_migrate_folio,
> >  	.isolate_page = balloon_page_isolate,
> >  	.putback_page = balloon_page_putback,
> >  };
> 
> I assume you're working on conversion of the other callbacks as well,
> because otherwise, this ends up looking a bit inconsistent and confusing :)

My intention was to finish converting aops for the next merge window.

However, it seems to me that we goofed back in 2016 by merging
commit bda807d44454.  isolate_page() and putback_page() should
never have been part of address_space_operations.

I'm about to embark on creating a new migrate_operations struct
for drivers to use that contains only isolate/putback/migrate.
No filesystem uses isolate/putback, so those can just be deleted.
Both migrate_operations & address_space_operations will contain a
migrate callback.