Factor outstanding I/O error handling

Cleanup: setting an outstanding error on a mapping was open coded too many
times.  Factor it out in mapping_set_error().

Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 56651a1..1c8e75a1 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -284,12 +284,8 @@
 				struct page *page, int error)
 {
 	lock_page(page);
-	if (page_mapping(page) == mapping) {
-		if (error == -ENOSPC)
-			set_bit(AS_ENOSPC, &mapping->flags);
-		else
-			set_bit(AS_EIO, &mapping->flags);
-	}
+	if (page_mapping(page) == mapping)
+		mapping_set_error(mapping, error);
 	unlock_page(page);
 }