[linux-2.6-block.git] / include / linux / dm-kcopyd.h

/*
 * Copyright (C) 2001 - 2003 Sistina Software
 * Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
 *
 * kcopyd provides a simple interface for copying an area of one
 * block-device to one or more other block-devices, either synchronous
 * or with an asynchronous completion notification.
 *
 * This file is released under the GPL.
 */

#ifndef _LINUX_DM_KCOPYD_H
#define _LINUX_DM_KCOPYD_H

#ifdef __KERNEL__

#include <linux/dm-io.h>

/* FIXME: make this configurable */
#define DM_KCOPYD_MAX_REGIONS 8

#define DM_KCOPYD_IGNORE_ERROR 1

/*
 * To use kcopyd you must first create a dm_kcopyd_client object.
 */
struct dm_kcopyd_client;
int dm_kcopyd_client_create(unsigned num_pages,
			    struct dm_kcopyd_client **result);
void dm_kcopyd_client_destroy(struct dm_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 (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
				    void *context);

int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
		   unsigned num_dests, struct dm_io_region *dests,
		   unsigned flags, dm_kcopyd_notify_fn fn, void *context);

#endif	/* __KERNEL__ */
#endif	/* _LINUX_DM_KCOPYD_H */
Commit	Line	Data
1da177e4	1	/*
eb69aca5 HM	2	* Copyright (C) 2001 - 2003 Sistina Software
eb69aca5 HM	3	* Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
1da177e4	4	*
eb69aca5 HM	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	*/
1da177e4 LT	11
eb69aca5 HM	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>
1da177e4 LT	18
1da177e4 LT	19	/* FIXME: make this configurable */
eb69aca5	20	#define DM_KCOPYD_MAX_REGIONS 8
1da177e4	21
eb69aca5	22	#define DM_KCOPYD_IGNORE_ERROR 1
1da177e4 LT	23
1da177e4 LT	24	/*
eb69aca5	25	* To use kcopyd you must first create a dm_kcopyd_client object.
1da177e4	26	*/
eb69aca5 HM	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);
1da177e4 LT	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	*/
eb69aca5 HM	39	typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
eb69aca5 HM	40	void *context);
1da177e4	41
eb69aca5 HM	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
eb69aca5 HM	46	#endif /* __KERNEL__ */
eb69aca5 HM	47	#endif /* _LINUX_DM_KCOPYD_H */