[linux-2.6-block.git] / drivers / md / dm.h

/*
 * Internal header file for device mapper
 *
 * Copyright (C) 2001, 2002 Sistina Software
 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
 *
 * This file is released under the LGPL.
 */

#ifndef DM_INTERNAL_H
#define DM_INTERNAL_H

#include <linux/fs.h>
#include <linux/device-mapper.h>
#include <linux/list.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>

/*
 * Suspend feature flags
 */
#define DM_SUSPEND_LOCKFS_FLAG		(1 << 0)
#define DM_SUSPEND_NOFLUSH_FLAG		(1 << 1)

/*
 * List of devices that a metadevice uses and should open/close.
 */
struct dm_dev {
	struct list_head list;

	atomic_t count;
	int mode;
	struct block_device *bdev;
	char name[16];
};

struct dm_table;

/*-----------------------------------------------------------------
 * Internal table functions.
 *---------------------------------------------------------------*/
void dm_table_event_callback(struct dm_table *t,
			     void (*fn)(void *), void *context);
struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
struct list_head *dm_table_get_devices(struct dm_table *t);
void dm_table_presuspend_targets(struct dm_table *t);
void dm_table_postsuspend_targets(struct dm_table *t);
int dm_table_resume_targets(struct dm_table *t);
int dm_table_any_congested(struct dm_table *t, int bdi_bits);
void dm_table_unplug_all(struct dm_table *t);

/*
 * To check the return value from dm_table_find_target().
 */
#define dm_target_is_valid(t) ((t)->table)

/*-----------------------------------------------------------------
 * A registry of target types.
 *---------------------------------------------------------------*/
int dm_target_init(void);
void dm_target_exit(void);
struct target_type *dm_get_target_type(const char *name);
void dm_put_target_type(struct target_type *t);
int dm_target_iterate(void (*iter_func)(struct target_type *tt,
					void *param), void *param);

/*-----------------------------------------------------------------
 * Useful inlines.
 *---------------------------------------------------------------*/
static inline int array_too_big(unsigned long fixed, unsigned long obj,
				unsigned long num)
{
	return (num > (ULONG_MAX - fixed) / obj);
}

int dm_split_args(int *argc, char ***argvp, char *input);

/*
 * The device-mapper can be driven through one of two interfaces;
 * ioctl or filesystem, depending which patch you have applied.
 */
int dm_interface_init(void);
void dm_interface_exit(void);

/*
 * Targets for linear and striped mappings
 */
int dm_linear_init(void);
void dm_linear_exit(void);

int dm_stripe_init(void);
void dm_stripe_exit(void);

void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
union map_info *dm_get_mapinfo(struct bio *bio);
int dm_open_count(struct mapped_device *md);
int dm_lock_for_deletion(struct mapped_device *md);

void dm_kobject_uevent(struct mapped_device *md);

/*
 * Dirty log
 */
int dm_dirty_log_init(void);
void dm_dirty_log_exit(void);

int dm_kcopyd_init(void);
void dm_kcopyd_exit(void);

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Internal header file for device mapper
	3	*
	4	* Copyright (C) 2001, 2002 Sistina Software
2b06cfff	5	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
1da177e4 LT	6	*
	7	* This file is released under the LGPL.
	8	*/
	9
	10	#ifndef DM_INTERNAL_H
	11	#define DM_INTERNAL_H
	12
	13	#include <linux/fs.h>
	14	#include <linux/device-mapper.h>
	15	#include <linux/list.h>
	16	#include <linux/blkdev.h>
3ac51e74	17	#include <linux/hdreg.h>
1da177e4	18
a3d77d35 KU	19	/*
	20	* Suspend feature flags
	21	*/
	22	#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
81fdb096	23	#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
a3d77d35	24
1da177e4 LT	25	/*
	26	* List of devices that a metadevice uses and should open/close.
	27	*/
	28	struct dm_dev {
	29	struct list_head list;
	30
	31	atomic_t count;
	32	int mode;
	33	struct block_device *bdev;
	34	char name[16];
	35	};
	36
	37	struct dm_table;
1da177e4 LT	38
1da177e4 LT	39	/*-----------------------------------------------------------------
17b2f66f	40	* Internal table functions.
1da177e4	41	---------------------------------------------------------------/
1da177e4 LT	42	void dm_table_event_callback(struct dm_table *t,
1da177e4 LT	43	void (fn)(void ), void *context);
1da177e4 LT	44	struct dm_target dm_table_get_target(struct dm_table t, unsigned int index);
	45	struct dm_target dm_table_find_target(struct dm_table t, sector_t sector);
	46	void dm_table_set_restrictions(struct dm_table t, struct request_queue q);
1da177e4	47	struct list_head dm_table_get_devices(struct dm_table t);
1da177e4 LT	48	void dm_table_presuspend_targets(struct dm_table *t);
1da177e4 LT	49	void dm_table_postsuspend_targets(struct dm_table *t);
8757b776	50	int dm_table_resume_targets(struct dm_table *t);
1da177e4 LT	51	int dm_table_any_congested(struct dm_table *t, int bdi_bits);
1da177e4 LT	52	void dm_table_unplug_all(struct dm_table *t);
1da177e4	53
512875bd JN	54	/*
	55	* To check the return value from dm_table_find_target().
	56	*/
	57	#define dm_target_is_valid(t) ((t)->table)
	58
1da177e4 LT	59	/*-----------------------------------------------------------------
	60	* A registry of target types.
	61	---------------------------------------------------------------/
	62	int dm_target_init(void);
	63	void dm_target_exit(void);
	64	struct target_type dm_get_target_type(const char name);
	65	void dm_put_target_type(struct target_type *t);
	66	int dm_target_iterate(void (iter_func)(struct target_type tt,
	67	void param), void param);
	68
1da177e4 LT	69	/*-----------------------------------------------------------------
	70	* Useful inlines.
	71	---------------------------------------------------------------/
	72	static inline int array_too_big(unsigned long fixed, unsigned long obj,
	73	unsigned long num)
	74	{
	75	return (num > (ULONG_MAX - fixed) / obj);
	76	}
	77
1da177e4 LT	78	int dm_split_args(int argc, char *argvp, char input);
	79
	80	/*
	81	* The device-mapper can be driven through one of two interfaces;
	82	* ioctl or filesystem, depending which patch you have applied.
	83	*/
	84	int dm_interface_init(void);
	85	void dm_interface_exit(void);
	86
	87	/*
	88	* Targets for linear and striped mappings
	89	*/
	90	int dm_linear_init(void);
	91	void dm_linear_exit(void);
	92
	93	int dm_stripe_init(void);
	94	void dm_stripe_exit(void);
	95
	96	void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
	97	union map_info dm_get_mapinfo(struct bio bio);
5c6bd75d AK	98	int dm_open_count(struct mapped_device *md);
5c6bd75d AK	99	int dm_lock_for_deletion(struct mapped_device *md);
1da177e4	100
69267a30 AK	101	void dm_kobject_uevent(struct mapped_device *md);
69267a30 AK	102
416cd17b HM	103	/*
	104	* Dirty log
	105	*/
	106	int dm_dirty_log_init(void);
	107	void dm_dirty_log_exit(void);
	108
945fa4d2 MP	109	int dm_kcopyd_init(void);
	110	void dm_kcopyd_exit(void);
	111
1da177e4	112	#endif