exfat: fix missing REQ_SYNC in exfat_update_bhs()

If 'dirsync' is enabled, all directory updates within the
filesystem should be done synchronously. exfat_update_bh()
does as this, but exfat_update_bhs() does not.

Reviewed-by: Andy.Wu <[email protected]>
Reviewed-by: Aoyama, Wataru <[email protected]>
Reviewed-by: Kobayashi, Kento <[email protected]>
Reviewed-by: Sungjong Seo <[email protected]>
Signed-off-by: Yuezhang.Mo <[email protected]>
Signed-off-by: Namjae Jeon <[email protected]>

misc.c

@@ -10,6 +10,7 @@
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/buffer_head.h>
+#include <linux/blk_types.h>
 
 #include "exfat_raw.h"
 #include "exfat_fs.h"
@@ -217,7 +218,7 @@ int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync)
 		set_buffer_uptodate(bhs[i]);
 		mark_buffer_dirty(bhs[i]);
 		if (sync)
-			write_dirty_buffer(bhs[i], 0);
+			write_dirty_buffer(bhs[i], REQ_SYNC);
 	}
 
 	for (i = 0; i < nr_bhs && sync; i++) {