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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Heinz Mauelshageneb69aca2008-04-24 21:43:19 +01002 * Copyright (C) 2001 - 2003 Sistina Software
3 * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
4 *
5 * kcopyd provides a simple interface for copying an area of one
6 * block-device to one or more other block-devices, either synchronous
7 * or with an asynchronous completion notification.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * This file is released under the GPL.
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
Heinz Mauelshageneb69aca2008-04-24 21:43:19 +010012#ifndef _LINUX_DM_KCOPYD_H
13#define _LINUX_DM_KCOPYD_H
14
15#ifdef __KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17#include "dm-io.h"
18
19/* FIXME: make this configurable */
Heinz Mauelshageneb69aca2008-04-24 21:43:19 +010020#define DM_KCOPYD_MAX_REGIONS 8
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Heinz Mauelshageneb69aca2008-04-24 21:43:19 +010022#define DM_KCOPYD_IGNORE_ERROR 1
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24/*
Heinz Mauelshageneb69aca2008-04-24 21:43:19 +010025 * To use kcopyd you must first create a dm_kcopyd_client object.
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 */
Heinz Mauelshageneb69aca2008-04-24 21:43:19 +010027struct dm_kcopyd_client;
28int dm_kcopyd_client_create(unsigned num_pages,
29 struct dm_kcopyd_client **result);
30void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32/*
33 * Submit a copy job to kcopyd. This is built on top of the
34 * previous three fns.
35 *
36 * read_err is a boolean,
37 * write_err is a bitset, with 1 bit for each destination region
38 */
Heinz Mauelshageneb69aca2008-04-24 21:43:19 +010039typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
40 void *context);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Heinz Mauelshageneb69aca2008-04-24 21:43:19 +010042int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
43 unsigned num_dests, struct dm_io_region *dests,
44 unsigned flags, dm_kcopyd_notify_fn fn, void *context);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Heinz Mauelshageneb69aca2008-04-24 21:43:19 +010046#endif /* __KERNEL__ */
47#endif /* _LINUX_DM_KCOPYD_H */