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commit03ddd7725eupstream. The migration code used to be able to migrate dirty 9p folios by writing them back using writepage. When the writepage method was removed, we neglected to add a migrate_folio method, which means that dirty 9p folios have been unmovable ever since. This reduced our success at defragmenting memory on machines which use 9p heavily. Fixes:80105ed2fd(9p: Use netfslib read/write_iter) Cc: stable@vger.kernel.org Cc: David Howells <dhowells@redhat.com> Cc: v9fs@lists.linux.dev Signed-off-by: "Matthew Wilcox (Oracle)" <willy@infradead.org> Link: https://lore.kernel.org/r/20250402150005.2309458-2-willy@infradead.org Acked-by: Dominique Martinet <asmadeus@codewreck.org> Reviewed-by: David Howells <dhowells@redhat.com> Signed-off-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>