diff --git a/fs/affs/file.c b/fs/affs/file.c
index 7e83ba2..d2468bf 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -398,6 +398,13 @@
 	size_t count = iov_iter_count(iter);
 	ssize_t ret;
 
+	if (rw == WRITE) {
+		loff_t size = offset + count;
+
+		if (AFFS_I(inode)->mmu_private < size)
+			return 0;
+	}
+
 	ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, affs_get_block);
 	if (ret < 0 && (rw & WRITE))
 		affs_write_failed(mapping, offset + count);