diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index ecc5db952deb..77cc62b026d3 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -309,11 +309,6 @@ struct exfat_inode_info {
 	/* for avoiding the race between alloc and free */
 	unsigned int cache_valid_id;
 
-	/*
-	 * NOTE: i_size_ondisk is 64bits, so must hold ->inode_lock to access.
-	 * physically allocated size.
-	 */
-	loff_t i_size_ondisk;
 	/* block-aligned i_size (used in cont_write_begin) */
 	loff_t i_size_aligned;
 	/* on-disk position of directory entry or 0 */
@@ -417,6 +412,11 @@ static inline bool is_valid_cluster(struct exfat_sb_info *sbi,
 	return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters;
 }
 
+static inline loff_t exfat_ondisk_size(const struct inode *inode)
+{
+	return ((loff_t)inode->i_blocks) << 9;
+}
+
 /* super.c */
 int exfat_set_volume_dirty(struct super_block *sb);
 int exfat_clear_volume_dirty(struct super_block *sb);
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index e19469e88000..fd4a8a170c1f 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -29,7 +29,7 @@ static int exfat_cont_expand(struct inode *inode, loff_t size)
 	if (ret)
 		return ret;
 
-	num_clusters = EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
+	num_clusters = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);
 	new_num_clusters = EXFAT_B_TO_CLU_ROUND_UP(size, sbi);
 
 	if (new_num_clusters == num_clusters)
@@ -75,7 +75,6 @@ out:
 	i_size_write(inode, size);
 
 	ei->i_size_aligned = round_up(size, sb->s_blocksize);
-	ei->i_size_ondisk = ei->i_size_aligned;
 	inode->i_blocks = round_up(size, sbi->cluster_size) >> 9;
 	mark_inode_dirty(inode);
 
@@ -159,7 +158,7 @@ int __exfat_truncate(struct inode *inode)
 	exfat_set_volume_dirty(sb);
 
 	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
-	num_clusters_phys = EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
+	num_clusters_phys = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);
 
 	exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
 
@@ -270,9 +269,6 @@ write_size:
 		aligned_size++;
 	}
 
-	if (ei->i_size_ondisk > i_size_read(inode))
-		ei->i_size_ondisk = aligned_size;
-
 	if (ei->i_size_aligned > i_size_read(inode))
 		ei->i_size_aligned = aligned_size;
 	mutex_unlock(&sbi->s_lock);
diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index 05f0e07b01d0..ed737ef288d2 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -130,11 +130,9 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
 	struct exfat_inode_info *ei = EXFAT_I(inode);
 	unsigned int local_clu_offset = clu_offset;
-	unsigned int num_to_be_allocated = 0, num_clusters = 0;
+	unsigned int num_to_be_allocated = 0, num_clusters;
 
-	if (ei->i_size_ondisk > 0)
-		num_clusters =
-			EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
+	num_clusters = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);
 
 	if (clu_offset >= num_clusters)
 		num_to_be_allocated = clu_offset - num_clusters + 1;
@@ -268,10 +266,10 @@ static int exfat_map_new_buffer(struct exfat_inode_info *ei,
 	set_buffer_new(bh);
 
 	/*
-	 * Adjust i_size_aligned if i_size_ondisk is bigger than it.
+	 * Adjust i_size_aligned if ondisk_size is bigger than it.
 	 */
-	if (ei->i_size_ondisk > ei->i_size_aligned)
-		ei->i_size_aligned = ei->i_size_ondisk;
+	if (exfat_ondisk_size(&ei->vfs_inode) > ei->i_size_aligned)
+		ei->i_size_aligned = exfat_ondisk_size(&ei->vfs_inode);
 	return 0;
 }
 
@@ -317,10 +315,6 @@ static int exfat_get_block(struct inode *inode, sector_t iblock,
 	max_blocks = min(mapped_blocks, max_blocks);
 
 	pos = EXFAT_BLK_TO_B((iblock + 1), sb);
-	if ((create && iblock >= last_block) || buffer_delay(bh_result)) {
-		if (ei->i_size_ondisk < pos)
-			ei->i_size_ondisk = pos;
-	}
 
 	map_bh(bh_result, sb, phys);
 	if (buffer_delay(bh_result))
@@ -674,7 +668,6 @@ static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 	}
 
 	ei->i_size_aligned = size;
-	ei->i_size_ondisk = size;
 
 	exfat_save_attr(inode, info->attr);
 
diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index 631ad9e8e32a..6313dee5c9bb 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -372,7 +372,6 @@ static int exfat_find_empty_entry(struct inode *inode,
 
 		/* directory inode should be updated in here */
 		i_size_write(inode, size);
-		ei->i_size_ondisk += sbi->cluster_size;
 		ei->i_size_aligned += sbi->cluster_size;
 		ei->valid_size += sbi->cluster_size;
 		ei->flags = p_dir->flags;
diff --git a/fs/exfat/super.c b/fs/exfat/super.c
index 323ecebe6f0e..6516edff38fc 100644
--- a/fs/exfat/super.c
+++ b/fs/exfat/super.c
@@ -371,7 +371,6 @@ static int exfat_read_root(struct inode *inode)
 	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 	ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff;
 	ei->i_size_aligned = i_size_read(inode);
-	ei->i_size_ondisk = i_size_read(inode);
 
 	exfat_save_attr(inode, EXFAT_ATTR_SUBDIR);
 	ei->i_crtime = simple_inode_init_ts(inode);