linux-kernel - Re: [PATCH] jfs: implement migrate_folio for jfs_metapage

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Message-ID: <Z_whZHPR64FHq6ve@casper.infradead.org>
Date: Sun, 13 Apr 2025 21:41:08 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Shivank Garg <shivankg@....com>
Cc: shaggy@...nel.org, jfs-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	syzbot+8bb6fd945af4e0ad9299@...kaller.appspotmail.com
Subject: Re: [PATCH] jfs: implement migrate_folio for jfs_metapage_aops

On Sun, Apr 13, 2025 at 05:23:57PM +0000, Shivank Garg wrote:
> +++ b/fs/jfs/jfs_metapage.c
> @@ -570,6 +570,7 @@ const struct address_space_operations jfs_metapage_aops = {
>  	.release_folio	= metapage_release_folio,
>  	.invalidate_folio = metapage_invalidate_folio,
>  	.dirty_folio	= filemap_dirty_folio,
> +	.migrate_folio	= filemap_migrate_folio,
>  };

Ooh, damn, I think we're going to need more than this ;-(

static inline struct metapage *folio_to_mp(struct folio *folio, int offset)
{
        return folio->private;
}

struct metapage {
...
        void *data;             /* Data pointer */

So we're going to need something like buffer_migrate_folio(), but
specialised to jfs metadata.  And when we come up with it, that'll
be Fixes: 35474d52c605