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Linux kernel mirror (for testing)
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linux
1/*
2 * 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.
8 *
9 * This file is released under the GPL.
10 */
11
12#ifndef _LINUX_DM_KCOPYD_H
13#define _LINUX_DM_KCOPYD_H
14
15#ifdef __KERNEL__
16
17#include <linux/dm-io.h>
18
19/* FIXME: make this configurable */
20#define DM_KCOPYD_MAX_REGIONS 8
21
22#define DM_KCOPYD_IGNORE_ERROR 1
23
24/*
25 * To use kcopyd you must first create a dm_kcopyd_client object.
26 */
27struct 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);
31
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 */
39typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
40 void *context);
41
42int 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);
45
46#endif /* __KERNEL__ */
47#endif /* _LINUX_DM_KCOPYD_H */