1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/md/kcopyd.h b/drivers/md/kcopyd.h
new file mode 100644
index 000000000000..4621ea055c0e
--- /dev/null
+++ b/drivers/md/kcopyd.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2001 Sistina Software
+ *
+ * This file is released under the GPL.
+ *
+ * Kcopyd provides a simple interface for copying an area of one
+ * block-device to one or more other block-devices, with an asynchronous
+ * completion notification.
+ */
+
+#ifndef DM_KCOPYD_H
+#define DM_KCOPYD_H
+
+#include "dm-io.h"
+
+/* FIXME: make this configurable */
+#define KCOPYD_MAX_REGIONS 8
+
+#define KCOPYD_IGNORE_ERROR 1
+
+/*
+ * To use kcopyd you must first create a kcopyd client object.
+ */
+struct kcopyd_client;
+int kcopyd_client_create(unsigned int num_pages, struct kcopyd_client **result);
+void kcopyd_client_destroy(struct kcopyd_client *kc);
+
+/*
+ * Submit a copy job to kcopyd.  This is built on top of the
+ * previous three fns.
+ *
+ * read_err is a boolean,
+ * write_err is a bitset, with 1 bit for each destination region
+ */
+typedef void (*kcopyd_notify_fn)(int read_err,
+                                 unsigned int write_err, void *context);
+
+int kcopyd_copy(struct kcopyd_client *kc, struct io_region *from,
+                unsigned int num_dests, struct io_region *dests,
+                unsigned int flags, kcopyd_notify_fn fn, void *context);
+
+#endif