diff --git a/fs/afs/file.c b/fs/afs/file.c
index c0cf8bfa00e8..7fe57f210259 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -28,6 +28,7 @@ static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter);
 static void afs_vm_open(struct vm_area_struct *area);
 static void afs_vm_close(struct vm_area_struct *area);
 static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pgoff_t end_pgoff);
+static ssize_t afs_direct_IO(struct kiocb *iocb, struct iov_iter *iter);
 
 const struct file_operations afs_file_operations = {
 	.open		= afs_open,
@@ -56,6 +57,7 @@ const struct address_space_operations afs_fs_aops = {
 	.launder_page	= afs_launder_page,
 	.releasepage	= afs_releasepage,
 	.invalidatepage	= afs_invalidatepage,
+	.direct_IO	= afs_direct_IO,
 	.write_begin	= afs_write_begin,
 	.write_end	= afs_write_end,
 	.writepage	= afs_writepage,
@@ -602,3 +604,60 @@ static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 
 	return generic_file_read_iter(iocb, iter);
 }
+
+/*
+ * Direct file read operation for an AFS file.
+ *
+ * TODO: To support AIO, the pages in the iterator have to be copied and
+ * refs taken on them.  Then -EIOCBQUEUED needs to be returned.
+ * iocb->ki_complete must then be called upon completion of the operation.
+ */
+static ssize_t afs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter)
+{
+	struct file *file = iocb->ki_filp;
+	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
+	struct afs_read *req;
+	ssize_t ret, transferred;
+
+	_enter("%llx,%zx", iocb->ki_pos, iov_iter_count(iter));
+
+	req = afs_alloc_read(GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	req->vnode	= vnode;
+	req->key	= key_get(afs_file_key(file));
+	req->pos	= iocb->ki_pos;
+	req->len	= iov_iter_count(iter);
+	req->iter	= iter;
+
+	task_io_account_read(req->len);
+
+	// TODO nfs_start_io_direct(inode);
+	ret = afs_fetch_data(vnode, req);
+	if (ret == 0)
+		transferred = req->actual_len;
+	afs_put_read(req);
+
+	// TODO nfs_end_io_direct(inode);
+
+	if (ret == 0)
+		ret = transferred;
+
+	BUG_ON(ret == -EIOCBQUEUED); // TODO
+	//if (iocb->ki_complete)
+	//	iocb->ki_complete(iocb, ret, 0); // only if ret == -EIOCBQUEUED
+
+	_leave(" = %zu", ret);
+	return ret;
+}
+
+/*
+ * Do direct I/O.
+ */
+static ssize_t afs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
+{
+	if (iov_iter_rw(iter) == READ)
+		return afs_file_direct_read(iocb, iter);
+	return afs_file_direct_write(iocb, iter);
+}
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index 4943413d9c5f..a7273106803c 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -439,7 +439,7 @@ static void afs_fs_fetch_data64(struct afs_operation *op)
 	bp[3] = htonl(vp->fid.unique);
 	bp[4] = htonl(upper_32_bits(req->pos));
 	bp[5] = htonl(lower_32_bits(req->pos));
-	bp[6] = 0;
+	bp[6] = htonl(upper_32_bits(req->len));
 	bp[7] = htonl(lower_32_bits(req->len));
 
 	trace_afs_make_fs_call(call, &vp->fid);
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 07d34291bf4f..3d640e84588e 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1538,6 +1538,7 @@ extern int afs_fsync(struct file *, loff_t, loff_t, int);
 extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
 extern void afs_prune_wb_keys(struct afs_vnode *);
 extern int afs_launder_page(struct page *);
+extern ssize_t afs_file_direct_write(struct kiocb *, struct iov_iter *);
 
 /*
  * xattr.c
diff --git a/fs/afs/write.c b/fs/afs/write.c
index fa96a65d28be..94a21ee974c0 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -1040,3 +1040,75 @@ static void afs_write_to_cache(struct afs_vnode *vnode,
 			       vnode->vfs_inode.i_mapping, start, len, i_size,
 			       afs_write_to_cache_done, vnode);
 }
+
+static void afs_dio_store_data_success(struct afs_operation *op)
+{
+	struct afs_vnode *vnode = op->file[0].vnode;
+
+	op->ctime = op->file[0].scb.status.mtime_client;
+	afs_vnode_commit_status(op, &op->file[0]);
+	if (op->error == 0) {
+		afs_stat_v(vnode, n_stores);
+		atomic_long_add(op->store.size, &afs_v2net(vnode)->n_store_bytes);
+	}
+}
+
+static const struct afs_operation_ops afs_dio_store_data_operation = {
+	.issue_afs_rpc	= afs_fs_store_data,
+	.issue_yfs_rpc	= yfs_fs_store_data,
+	.success	= afs_dio_store_data_success,
+};
+
+/*
+ * Direct file write operation for an AFS file.
+ *
+ * TODO: To support AIO, the pages in the iterator have to be copied and
+ * refs taken on them.  Then -EIOCBQUEUED needs to be returned.
+ * iocb->ki_complete must then be called upon completion of the operation.
+ */
+ssize_t afs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
+{
+	struct file *file = iocb->ki_filp;
+	struct afs_vnode *vnode = AFS_FS_I(file_inode(file));
+	struct afs_operation *op;
+	loff_t size = iov_iter_count(iter), i_size;
+	ssize_t ret;
+
+	_enter("%s{%llx:%llu.%u},%llx,%llx",
+	       vnode->volume->name,
+	       vnode->fid.vid,
+	       vnode->fid.vnode,
+	       vnode->fid.unique,
+	       size, iocb->ki_pos);
+
+	op = afs_alloc_operation(afs_file_key(file), vnode->volume);
+	if (IS_ERR(op))
+		return -ENOMEM;
+
+	i_size = i_size_read(&vnode->vfs_inode);
+
+	afs_op_set_vnode(op, 0, vnode);
+	op->file[0].dv_delta	= 1;
+	op->file[0].set_size	= true;
+	op->file[0].modification = true;
+	op->store.write_iter	= iter;
+	op->store.pos		= iocb->ki_pos;
+	op->store.size		= size;
+	op->store.i_size	= max(iocb->ki_pos + size, i_size);
+	op->mtime		= current_time(&vnode->vfs_inode);
+	op->ops			= &afs_dio_store_data_operation;
+
+	//if (!is_sync_kiocb(iocb)) {
+
+	ret = afs_do_sync_operation(op);
+	if (ret == 0)
+		ret = size;
+
+	afs_invalidate_cache(vnode, FSCACHE_INVAL_DIO_WRITE);
+
+	//if (iocb->ki_complete)
+	//	iocb->ki_complete(iocb, ret, 0); // only if ret == -EIOCBQUEUED
+
+	_leave(" = %zd", ret);
+	return ret;
+}
