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/*
* Copyright (C) 2001 Sistina Software
*
* This file is released under the GPL.
*
* Kcopyd provides a simple interface for copying an area of one
* block-device to one or more other block-devices, with an asynchronous
* completion notification.
*/
#ifndef DM_KCOPYD_H
#define DM_KCOPYD_H
#include "dm-io.h"
/* FIXME: make this configurable */
#define KCOPYD_MAX_REGIONS 8
#define KCOPYD_IGNORE_ERROR 1
/*
* To use kcopyd you must first create a kcopyd client object.
*/
struct kcopyd_client;
int kcopyd_client_create(unsigned int num_pages, struct kcopyd_client **result);
void kcopyd_client_destroy(struct kcopyd_client *kc);
/*
* Submit a copy job to kcopyd. This is built on top of the
* previous three fns.
*
* read_err is a boolean,
* write_err is a bitset, with 1 bit for each destination region
*/
typedef void (*kcopyd_notify_fn)(int read_err, unsigned long write_err,
void *context);
int kcopyd_copy(struct kcopyd_client *kc, struct io_region *from,
unsigned int num_dests, struct io_region *dests,
unsigned int flags, kcopyd_notify_fn fn, void *context);
#endif
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