fs: Remove aops ->set_page_dirty

With all implementations converted to ->dirty_folio, we can stop calling
this fallback method and remove it entirely.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs
Tested-by: David Howells <dhowells@redhat.com> # afs

fs/ecryptfs/mmap.c

@@ -540,7 +540,7 @@ const struct address_space_operations ecryptfs_aops = {
 	 * XXX: This is pretty broken for multiple reasons: ecryptfs does not
 	 * actually use buffer_heads, and ecryptfs will crash without
 	 * CONFIG_BLOCK.  But it matches the behavior before the default for
-	 * address_space_operations without the ->set_page_dirty method was
+	 * address_space_operations without the ->dirty_folio method was
 	 * cleaned up, so this is the best we can do without maintainer
 	 * feedback.
 	 */

include/linux/fs.h

@@ -367,8 +367,7 @@ struct address_space_operations {
 	/* Write back some dirty pages from this mapping. */
 	int (*writepages)(struct address_space *, struct writeback_control *);
 
-	/* Set a page dirty.  Return true if this dirtied it */
-	int (*set_page_dirty)(struct page *page);
+	/* Mark a folio dirty.  Return true if this dirtied it */
 	bool (*dirty_folio)(struct address_space *, struct folio *);
 
 	/*

mm/page-writeback.c

@@ -2641,15 +2641,10 @@ bool folio_mark_dirty(struct folio *folio)
 		 */
 		if (folio_test_reclaim(folio))
 			folio_clear_reclaim(folio);
-		if (mapping->a_ops->dirty_folio)
-			return mapping->a_ops->dirty_folio(mapping, folio);
-		return mapping->a_ops->set_page_dirty(&folio->page);
+		return mapping->a_ops->dirty_folio(mapping, folio);
 	}
-	if (!folio_test_dirty(folio)) {
-		if (!folio_test_set_dirty(folio))
-			return true;
-	}
-	return false;
+
+	return noop_dirty_folio(mapping, folio);
 }
 EXPORT_SYMBOL(folio_mark_dirty);
 

mm/page_io.c

@@ -449,9 +449,7 @@ bool swap_dirty_folio(struct address_space *mapping, struct folio *folio)
 		aops = mapping->a_ops;
 
 		VM_BUG_ON_FOLIO(!folio_test_swapcache(folio), folio);
-		if (aops->dirty_folio)
-			return aops->dirty_folio(mapping, folio);
-		return aops->set_page_dirty(&folio->page);
+		return aops->dirty_folio(mapping, folio);
 	} else {
 		return noop_dirty_folio(mapping, folio);
 	}