}
sector_t generic_block_bmap(struct address_space *, sector_t, get_block_t *);
int block_truncate_page(struct address_space *, loff_t, get_block_t *);
-int nobh_write_begin(struct address_space *, loff_t, unsigned len,
- struct page **, void **, get_block_t*);
-int nobh_write_end(struct file *, struct address_space *,
- loff_t, unsigned, unsigned,
- struct page *, void *);
-int nobh_truncate_page(struct address_space *, loff_t, get_block_t *);
-int nobh_writepage(struct page *page, get_block_t *get_block,
- struct writeback_control *wbc);
+
+#ifdef CONFIG_MIGRATION
+extern int buffer_migrate_folio(struct address_space *,
+ struct folio *dst, struct folio *src, enum migrate_mode);
+extern int buffer_migrate_folio_norefs(struct address_space *,
+ struct folio *dst, struct folio *src, enum migrate_mode);
+#else
+#define buffer_migrate_folio NULL
+#define buffer_migrate_folio_norefs NULL
+#endif
void buffer_init(void);