| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |