[PATCH] direct-io bio_add_page fix

From Badari.

bio_add_page returns zero on failure - we need to propagate that
to the dio_bio_add_page() caller.

fs/direct-io.c

@@ -410,9 +410,11 @@ static int dio_new_bio(struct dio *dio, sector_t blkno)
 }
 
 /*
- * Attempt tp put the current chunk of 'cur_page' into the current BIO.  If
+ * Attempt to put the current chunk of 'cur_page' into the current BIO.  If
  * that was successful then update final_block_in_bio and take a ref against
  * the just-added page.
+ *
+ * Return zero on success.  Non-zero means the caller needs to start a new BIO.
  */
 static int dio_bio_add_page(struct dio *dio)
 {
@@ -426,6 +428,8 @@ static int dio_bio_add_page(struct dio *dio)
 		dio->final_block_in_bio = dio->cur_page_block +
 			(dio->cur_page_len >> dio->blkbits);
 		ret = 0;
+	} else {
+		ret = 1;
 	}
 	return ret;
 }