diff --git a/fs/exfat/fatent.c b/fs/exfat/fatent.c
index 9a4143f3fc0c..4177a933e0be 100644
--- a/fs/exfat/fatent.c
+++ b/fs/exfat/fatent.c
@@ -11,11 +11,11 @@
 #include "exfat_raw.h"
 #include "exfat_fs.h"
 
-static int exfat_mirror_bh(struct super_block *sb, sector_t sec,
-		struct buffer_head *bh)
+static int exfat_mirror_bh(struct super_block *sb, struct buffer_head *bh)
 {
 	struct buffer_head *c_bh;
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	sector_t sec = bh->b_blocknr;
 	sector_t sec2;
 	int err = 0;
 
@@ -25,10 +25,7 @@ static int exfat_mirror_bh(struct super_block *sb, sector_t sec,
 		if (!c_bh)
 			return -ENOMEM;
 		memcpy(c_bh->b_data, bh->b_data, sb->s_blocksize);
-		set_buffer_uptodate(c_bh);
-		mark_buffer_dirty(c_bh);
-		if (sb->s_flags & SB_SYNCHRONOUS)
-			err = sync_dirty_buffer(c_bh);
+		exfat_update_bh(c_bh, sb->s_flags & SB_SYNCHRONOUS);
 		brelse(c_bh);
 	}
 
@@ -83,7 +80,7 @@ int exfat_ent_set(struct super_block *sb, unsigned int loc,
 	fat_entry = (__le32 *)&(bh->b_data[off]);
 	*fat_entry = cpu_to_le32(content);
 	exfat_update_bh(bh, sb->s_flags & SB_SYNCHRONOUS);
-	exfat_mirror_bh(sb, sec, bh);
+	exfat_mirror_bh(sb, bh);
 	brelse(bh);
 	return 0;
 }