1 /*
2 * Copyright (C) 2001 Sistina Software
3 *
4 * This file is released under the GPL.
5 *
6 * Kcopyd provides a simple interface for copying an area of one
7 * block-device to one or more other block-devices, with an asynchronous
8 * completion notification.
9 */
10
11 #ifndef DM_KCOPYD_H
12 #define DM_KCOPYD_H
13
14 #include "dm-io.h"
15
16 /* FIXME: make this configurable */
17 #define KCOPYD_MAX_REGIONS 8
18
19 #define KCOPYD_IGNORE_ERROR 1
20
21 /*
22 * To use kcopyd you must first create a kcopyd client object.
23 */
24 struct kcopyd_client;
25 int kcopyd_client_create(unsigned int num_pages, struct kcopyd_client **result);
26 void kcopyd_client_destroy(struct kcopyd_client *kc);
27
28 /*
29 * Submit a copy job to kcopyd. This is built on top of the
30 * previous three fns.
31 *
32 * read_err is a boolean,
33 * write_err is a bitset, with 1 bit for each destination region
34 */
35 typedef void (*kcopyd_notify_fn)(int read_err,
36 unsigned int write_err, void *context);
37
38 int kcopyd_copy(struct kcopyd_client *kc, struct io_region *from,
39 unsigned int num_dests, struct io_region *dests,
40 unsigned int flags, kcopyd_notify_fn fn, void *context);
41
42 #endif
43
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