projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 |