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1da177e4 | 1 | /* |
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2 | * Copyright (C) 2001 - 2003 Sistina Software |
3 | * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved. | |
1da177e4 | 4 | * |
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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. | |
1da177e4 | 8 | * |
eb69aca5 | 9 | * This file is released under the GPL. |
1da177e4 LT |
10 | */ |
11 | ||
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12 | #ifndef _LINUX_DM_KCOPYD_H |
13 | #define _LINUX_DM_KCOPYD_H | |
14 | ||
15 | #ifdef __KERNEL__ | |
1da177e4 | 16 | |
a765e20e | 17 | #include <linux/dm-io.h> |
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18 | |
19 | /* FIXME: make this configurable */ | |
eb69aca5 | 20 | #define DM_KCOPYD_MAX_REGIONS 8 |
1da177e4 | 21 | |
eb69aca5 | 22 | #define DM_KCOPYD_IGNORE_ERROR 1 |
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23 | |
24 | /* | |
eb69aca5 | 25 | * To use kcopyd you must first create a dm_kcopyd_client object. |
1da177e4 | 26 | */ |
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27 | struct dm_kcopyd_client; |
28 | int dm_kcopyd_client_create(unsigned num_pages, | |
29 | struct dm_kcopyd_client **result); | |
30 | void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc); | |
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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 | */ | |
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39 | typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err, |
40 | void *context); | |
1da177e4 | 41 | |
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42 | int 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); | |
1da177e4 | 45 | |
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46 | #endif /* __KERNEL__ */ |
47 | #endif /* _LINUX_DM_KCOPYD_H */ |