1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/md/dm-kcopyd.h b/drivers/md/dm-kcopyd.h
new file mode 100644
index 000000000000..d3057846b0b0
--- /dev/null
+++ b/drivers/md/dm-kcopyd.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2001 - 2003 Sistina Software
+ * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
+ *
+ * kcopyd provides a simple interface for copying an area of one
+ * block-device to one or more other block-devices, either synchronous
+ * or with an asynchronous completion notification.
+ *
+ * This file is released under the GPL.
+ */
+
+#ifndef _LINUX_DM_KCOPYD_H
+#define _LINUX_DM_KCOPYD_H
+
+#ifdef __KERNEL__
+
+#include "dm-io.h"
+
+/* FIXME: make this configurable */
+#define DM_KCOPYD_MAX_REGIONS 8
+
+#define DM_KCOPYD_IGNORE_ERROR 1
+
+/*
+ * To use kcopyd you must first create a dm_kcopyd_client object.
+ */
+struct dm_kcopyd_client;
+int dm_kcopyd_client_create(unsigned num_pages,
+                            struct dm_kcopyd_client **result);
+void dm_kcopyd_client_destroy(struct dm_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 (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
+                                    void *context);
+
+int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
+                   unsigned num_dests, struct dm_io_region *dests,
+                   unsigned flags, dm_kcopyd_notify_fn fn, void *context);
+
+#endif  /* __KERNEL__ */
+#endif  /* _LINUX_DM_KCOPYD_H */