diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index db3ead52ec7c1..0c1af2dd9069e 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1849,9 +1849,17 @@ smb2_copychunk_range(const unsigned int xid,
 	int chunks_copied = 0;
 	bool chunk_sizes_updated = false;
 	ssize_t bytes_written, total_bytes_written = 0;
+	struct inode *inode;
 
 	pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
 
+	/*
+	 * We need to flush all unwritten data before we can send the
+	 * copychunk ioctl to the server.
+	 */
+	inode = d_inode(trgtfile->dentry);
+	filemap_write_and_wait(inode->i_mapping);
+
 	if (pcchunk == NULL)
 		return -ENOMEM;