[net-next-2.6.git] / include / linux / device-mapper.h

/*
 * Copyright (C) 2001 Sistina Software (UK) Limited.
 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
 *
 * This file is released under the LGPL.
 */

#ifndef _LINUX_DEVICE_MAPPER_H
#define _LINUX_DEVICE_MAPPER_H

#include <linux/bio.h>
#include <linux/blkdev.h>

struct dm_target;
struct dm_table;
struct mapped_device;
struct bio_vec;

typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;

union map_info {
	void *ptr;
	unsigned long long ll;
	unsigned flush_request;
};

/*
 * In the constructor the target parameter will already have the
 * table, type, begin and len fields filled in.
 */
typedef int (*dm_ctr_fn) (struct dm_target *target,
			  unsigned int argc, char **argv);

/*
 * The destructor doesn't need to free the dm_target, just
 * anything hidden ti->private.
 */
typedef void (*dm_dtr_fn) (struct dm_target *ti);

/*
 * The map function must return:
 * < 0: error
 * = 0: The target will handle the io by resubmitting it later
 * = 1: simple remap complete
 * = 2: The target wants to push back the io
 */
typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio,
			  union map_info *map_context);
typedef int (*dm_map_request_fn) (struct dm_target *ti, struct request *clone,
				  union map_info *map_context);

/*
 * Returns:
 * < 0 : error (currently ignored)
 * 0   : ended successfully
 * 1   : for some reason the io has still not completed (eg,
 *       multipath target might want to requeue a failed io).
 * 2   : The target wants to push back the io
 */
typedef int (*dm_endio_fn) (struct dm_target *ti,
			    struct bio *bio, int error,
			    union map_info *map_context);
typedef int (*dm_request_endio_fn) (struct dm_target *ti,
				    struct request *clone, int error,
				    union map_info *map_context);

typedef void (*dm_flush_fn) (struct dm_target *ti);
typedef void (*dm_presuspend_fn) (struct dm_target *ti);
typedef void (*dm_postsuspend_fn) (struct dm_target *ti);
typedef int (*dm_preresume_fn) (struct dm_target *ti);
typedef void (*dm_resume_fn) (struct dm_target *ti);

typedef int (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
			     char *result, unsigned int maxlen);

typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv);

typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd,
			    unsigned long arg);

typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm,
			    struct bio_vec *biovec, int max_size);

/*
 * Returns:
 *    0: The target can handle the next I/O immediately.
 *    1: The target can't handle the next I/O immediately.
 */
typedef int (*dm_busy_fn) (struct dm_target *ti);

void dm_error(const char *message);

/*
 * Combine device limits.
 */
void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev);

struct dm_dev {
	struct block_device *bdev;
	fmode_t mode;
	char name[16];
};

/*
 * Constructors should call these functions to ensure destination devices
 * are opened/closed correctly.
 * FIXME: too many arguments.
 */
int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
		  sector_t len, fmode_t mode, struct dm_dev **result);
void dm_put_device(struct dm_target *ti, struct dm_dev *d);

/*
 * Information about a target type
 */

/*
 * Target features
 */

struct target_type {
	uint64_t features;
	const char *name;
	struct module *module;
	unsigned version[3];
	dm_ctr_fn ctr;
	dm_dtr_fn dtr;
	dm_map_fn map;
	dm_map_request_fn map_rq;
	dm_endio_fn end_io;
	dm_request_endio_fn rq_end_io;
	dm_flush_fn flush;
	dm_presuspend_fn presuspend;
	dm_postsuspend_fn postsuspend;
	dm_preresume_fn preresume;
	dm_resume_fn resume;
	dm_status_fn status;
	dm_message_fn message;
	dm_ioctl_fn ioctl;
	dm_merge_fn merge;
	dm_busy_fn busy;

	/* For internal device-mapper use. */
	struct list_head list;
};

struct dm_target {
	struct dm_table *table;
	struct target_type *type;

	/* target limits */
	sector_t begin;
	sector_t len;

	/* FIXME: turn this into a mask, and merge with queue_limits */
	/* Always a power of 2 */
	sector_t split_io;

	/*
	 * A number of zero-length barrier requests that will be submitted
	 * to the target for the purpose of flushing cache.
	 *
	 * The request number will be placed in union map_info->flush_request.
	 * It is a responsibility of the target driver to remap these requests
	 * to the real underlying devices.
	 */
	unsigned num_flush_requests;

	/*
	 * These are automatically filled in by
	 * dm_table_get_device.
	 */
	struct queue_limits limits;

	/* target specific data */
	void *private;

	/* Used to provide an error string from the ctr */
	char *error;
};

int dm_register_target(struct target_type *t);
void dm_unregister_target(struct target_type *t);

/*-----------------------------------------------------------------
 * Functions for creating and manipulating mapped devices.
 * Drop the reference with dm_put when you finish with the object.
 *---------------------------------------------------------------*/

/*
 * DM_ANY_MINOR chooses the next available minor number.
 */
#define DM_ANY_MINOR (-1)
int dm_create(int minor, struct mapped_device **md);

/*
 * Reference counting for md.
 */
struct mapped_device *dm_get_md(dev_t dev);
void dm_get(struct mapped_device *md);
void dm_put(struct mapped_device *md);

/*
 * An arbitrary pointer may be stored alongside a mapped device.
 */
void dm_set_mdptr(struct mapped_device *md, void *ptr);
void *dm_get_mdptr(struct mapped_device *md);

/*
 * A device can still be used while suspended, but I/O is deferred.
 */
int dm_suspend(struct mapped_device *md, unsigned suspend_flags);
int dm_resume(struct mapped_device *md);

/*
 * Event functions.
 */
uint32_t dm_get_event_nr(struct mapped_device *md);
int dm_wait_event(struct mapped_device *md, int event_nr);
uint32_t dm_next_uevent_seq(struct mapped_device *md);
void dm_uevent_add(struct mapped_device *md, struct list_head *elist);

/*
 * Info functions.
 */
const char *dm_device_name(struct mapped_device *md);
int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid);
struct gendisk *dm_disk(struct mapped_device *md);
int dm_suspended(struct mapped_device *md);
int dm_noflush_suspending(struct dm_target *ti);
union map_info *dm_get_mapinfo(struct bio *bio);

/*
 * Geometry functions.
 */
int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo);
int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo);


/*-----------------------------------------------------------------
 * Functions for manipulating device-mapper tables.
 *---------------------------------------------------------------*/

/*
 * First create an empty table.
 */
int dm_table_create(struct dm_table **result, fmode_t mode,
		    unsigned num_targets, struct mapped_device *md);

/*
 * Then call this once for each target.
 */
int dm_table_add_target(struct dm_table *t, const char *type,
			sector_t start, sector_t len, char *params);

/*
 * Finally call this to make the table ready for use.
 */
int dm_table_complete(struct dm_table *t);

/*
 * Unplug all devices in a table.
 */
void dm_table_unplug_all(struct dm_table *t);

/*
 * Table reference counting.
 */
struct dm_table *dm_get_table(struct mapped_device *md);
void dm_table_get(struct dm_table *t);
void dm_table_put(struct dm_table *t);

/*
 * Queries
 */
sector_t dm_table_get_size(struct dm_table *t);
unsigned int dm_table_get_num_targets(struct dm_table *t);
fmode_t dm_table_get_mode(struct dm_table *t);
struct mapped_device *dm_table_get_md(struct dm_table *t);

/*
 * Trigger an event.
 */
void dm_table_event(struct dm_table *t);

/*
 * The device must be suspended before calling this method.
 */
int dm_swap_table(struct mapped_device *md, struct dm_table *t);

/*
 * A wrapper around vmalloc.
 */
void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);

/*-----------------------------------------------------------------
 * Macros.
 *---------------------------------------------------------------*/
#define DM_NAME "device-mapper"

#define DMCRIT(f, arg...) \
	printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)

#define DMERR(f, arg...) \
	printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMERR_LIMIT(f, arg...) \
	do { \
		if (printk_ratelimit())	\
			printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \
			       f "\n", ## arg); \
	} while (0)

#define DMWARN(f, arg...) \
	printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMWARN_LIMIT(f, arg...) \
	do { \
		if (printk_ratelimit())	\
			printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \
			       f "\n", ## arg); \
	} while (0)

#define DMINFO(f, arg...) \
	printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
#define DMINFO_LIMIT(f, arg...) \
	do { \
		if (printk_ratelimit())	\
			printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \
			       "\n", ## arg); \
	} while (0)

#ifdef CONFIG_DM_DEBUG
#  define DMDEBUG(f, arg...) \
	printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg)
#  define DMDEBUG_LIMIT(f, arg...) \
	do { \
		if (printk_ratelimit())	\
			printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \
			       "\n", ## arg); \
	} while (0)
#else
#  define DMDEBUG(f, arg...) do {} while (0)
#  define DMDEBUG_LIMIT(f, arg...) do {} while (0)
#endif

#define DMEMIT(x...) sz += ((sz >= maxlen) ? \
			  0 : scnprintf(result + sz, maxlen - sz, x))

#define SECTOR_SHIFT 9

/*
 * Definitions of return values from target end_io function.
 */
#define DM_ENDIO_INCOMPLETE	1
#define DM_ENDIO_REQUEUE	2

/*
 * Definitions of return values from target map function.
 */
#define DM_MAPIO_SUBMITTED	0
#define DM_MAPIO_REMAPPED	1
#define DM_MAPIO_REQUEUE	DM_ENDIO_REQUEUE

/*
 * Ceiling(n / sz)
 */
#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))

#define dm_sector_div_up(n, sz) ( \
{ \
	sector_t _r = ((n) + (sz) - 1); \
	sector_div(_r, (sz)); \
	_r; \
} \
)

/*
 * ceiling(n / size) * size
 */
#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))

#define dm_array_too_big(fixed, obj, num) \
	((num) > (UINT_MAX - (fixed)) / (obj))

static inline sector_t to_sector(unsigned long n)
{
	return (n >> SECTOR_SHIFT);
}

static inline unsigned long to_bytes(sector_t n)
{
	return (n << SECTOR_SHIFT);
}

#endif	/* _LINUX_DEVICE_MAPPER_H */
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* Copyright (C) 2001 Sistina Software (UK) Limited.
0da336e5	3	* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
1da177e4 LT	4	*
	5	* This file is released under the LGPL.
	6	*/
	7
	8	#ifndef _LINUX_DEVICE_MAPPER_H
	9	#define _LINUX_DEVICE_MAPPER_H
	10
416cd17b	11	#include <linux/bio.h>
f6fccb12	12	#include <linux/blkdev.h>
416cd17b	13
1da177e4 LT	14	struct dm_target;
1da177e4 LT	15	struct dm_table;
17b2f66f	16	struct mapped_device;
f6fccb12	17	struct bio_vec;
1da177e4 LT	18
	19	typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
	20
	21	union map_info {
	22	void *ptr;
	23	unsigned long long ll;
f9ab94ce	24	unsigned flush_request;
1da177e4 LT	25	};
	26
	27	/*
	28	* In the constructor the target parameter will already have the
	29	* table, type, begin and len fields filled in.
	30	*/
	31	typedef int (dm_ctr_fn) (struct dm_target target,
	32	unsigned int argc, char **argv);
	33
	34	/*
	35	* The destructor doesn't need to free the dm_target, just
	36	* anything hidden ti->private.
	37	*/
	38	typedef void (dm_dtr_fn) (struct dm_target ti);
	39
	40	/*
	41	* The map function must return:
	42	* < 0: error
	43	* = 0: The target will handle the io by resubmitting it later
45cbcd79	44	* = 1: simple remap complete
2e93ccc1	45	* = 2: The target wants to push back the io
1da177e4 LT	46	*/
	47	typedef int (dm_map_fn) (struct dm_target ti, struct bio *bio,
	48	union map_info *map_context);
7d76345d KU	49	typedef int (dm_map_request_fn) (struct dm_target ti, struct request *clone,
7d76345d KU	50	union map_info *map_context);
1da177e4 LT	51
	52	/*
	53	* Returns:
	54	* < 0 : error (currently ignored)
	55	* 0 : ended successfully
	56	* 1 : for some reason the io has still not completed (eg,
	57	* multipath target might want to requeue a failed io).
2e93ccc1	58	* 2 : The target wants to push back the io
1da177e4 LT	59	*/
	60	typedef int (dm_endio_fn) (struct dm_target ti,
	61	struct bio *bio, int error,
	62	union map_info *map_context);
7d76345d KU	63	typedef int (dm_request_endio_fn) (struct dm_target ti,
	64	struct request *clone, int error,
	65	union map_info *map_context);
1da177e4	66
999d8168	67	typedef void (dm_flush_fn) (struct dm_target ti);
1da177e4 LT	68	typedef void (dm_presuspend_fn) (struct dm_target ti);
1da177e4 LT	69	typedef void (dm_postsuspend_fn) (struct dm_target ti);
8757b776	70	typedef int (dm_preresume_fn) (struct dm_target ti);
1da177e4 LT	71	typedef void (dm_resume_fn) (struct dm_target ti);
	72
	73	typedef int (dm_status_fn) (struct dm_target ti, status_type_t status_type,
	74	char *result, unsigned int maxlen);
	75
	76	typedef int (dm_message_fn) (struct dm_target ti, unsigned argc, char **argv);
	77
647b3d00	78	typedef int (dm_ioctl_fn) (struct dm_target ti, unsigned int cmd,
aa129a22 MB	79	unsigned long arg);
aa129a22 MB	80
f6fccb12 MB	81	typedef int (dm_merge_fn) (struct dm_target ti, struct bvec_merge_data *bvm,
	82	struct bio_vec *biovec, int max_size);
	83
7d76345d KU	84	/*
	85	* Returns:
	86	* 0: The target can handle the next I/O immediately.
	87	* 1: The target can't handle the next I/O immediately.
	88	*/
	89	typedef int (dm_busy_fn) (struct dm_target ti);
	90
1da177e4 LT	91	void dm_error(const char *message);
1da177e4 LT	92
3cb40214 BR	93	/*
	94	* Combine device limits.
	95	*/
	96	void dm_set_device_limits(struct dm_target ti, struct block_device bdev);
	97
82b1519b MP	98	struct dm_dev {
82b1519b MP	99	struct block_device *bdev;
aeb5d727	100	fmode_t mode;
82b1519b MP	101	char name[16];
	102	};
	103
1da177e4 LT	104	/*
	105	* Constructors should call these functions to ensure destination devices
	106	* are opened/closed correctly.
	107	* FIXME: too many arguments.
	108	*/
	109	int dm_get_device(struct dm_target ti, const char path, sector_t start,
aeb5d727	110	sector_t len, fmode_t mode, struct dm_dev **result);
1da177e4 LT	111	void dm_put_device(struct dm_target ti, struct dm_dev d);
	112
	113	/*
	114	* Information about a target type
	115	*/
ab4c1424 AK	116
	117	/*
	118	* Target features
	119	*/
ab4c1424	120
1da177e4	121	struct target_type {
ab4c1424	122	uint64_t features;
1da177e4 LT	123	const char *name;
1da177e4 LT	124	struct module *module;
17b2f66f	125	unsigned version[3];
1da177e4 LT	126	dm_ctr_fn ctr;
	127	dm_dtr_fn dtr;
	128	dm_map_fn map;
7d76345d	129	dm_map_request_fn map_rq;
1da177e4	130	dm_endio_fn end_io;
7d76345d	131	dm_request_endio_fn rq_end_io;
999d8168	132	dm_flush_fn flush;
1da177e4 LT	133	dm_presuspend_fn presuspend;
1da177e4 LT	134	dm_postsuspend_fn postsuspend;
8757b776	135	dm_preresume_fn preresume;
1da177e4 LT	136	dm_resume_fn resume;
	137	dm_status_fn status;
	138	dm_message_fn message;
aa129a22	139	dm_ioctl_fn ioctl;
f6fccb12	140	dm_merge_fn merge;
7d76345d	141	dm_busy_fn busy;
45194e4f CR	142
	143	/* For internal device-mapper use. */
	144	struct list_head list;
1da177e4 LT	145	};
1da177e4 LT	146
1da177e4 LT	147	struct dm_target {
	148	struct dm_table *table;
	149	struct target_type *type;
	150
	151	/* target limits */
	152	sector_t begin;
	153	sector_t len;
	154
5ab97588	155	/* FIXME: turn this into a mask, and merge with queue_limits */
1da177e4 LT	156	/* Always a power of 2 */
	157	sector_t split_io;
	158
f9ab94ce MP	159	/*
	160	* A number of zero-length barrier requests that will be submitted
	161	* to the target for the purpose of flushing cache.
	162	*
	163	* The request number will be placed in union map_info->flush_request.
	164	* It is a responsibility of the target driver to remap these requests
	165	* to the real underlying devices.
	166	*/
	167	unsigned num_flush_requests;
	168
1da177e4 LT	169	/*
	170	* These are automatically filled in by
	171	* dm_table_get_device.
	172	*/
5ab97588	173	struct queue_limits limits;
1da177e4 LT	174
	175	/* target specific data */
	176	void *private;
	177
	178	/* Used to provide an error string from the ctr */
	179	char *error;
	180	};
	181
	182	int dm_register_target(struct target_type *t);
10d3bd09	183	void dm_unregister_target(struct target_type *t);
17b2f66f AK	184
	185	/*-----------------------------------------------------------------
	186	* Functions for creating and manipulating mapped devices.
	187	* Drop the reference with dm_put when you finish with the object.
	188	---------------------------------------------------------------/
	189
	190	/*
	191	* DM_ANY_MINOR chooses the next available minor number.
	192	*/
	193	#define DM_ANY_MINOR (-1)
	194	int dm_create(int minor, struct mapped_device **md);
	195
	196	/*
	197	* Reference counting for md.
	198	*/
	199	struct mapped_device *dm_get_md(dev_t dev);
	200	void dm_get(struct mapped_device *md);
	201	void dm_put(struct mapped_device *md);
	202
	203	/*
	204	* An arbitrary pointer may be stored alongside a mapped device.
	205	*/
	206	void dm_set_mdptr(struct mapped_device md, void ptr);
	207	void dm_get_mdptr(struct mapped_device md);
	208
	209	/*
	210	* A device can still be used while suspended, but I/O is deferred.
	211	*/
a3d77d35	212	int dm_suspend(struct mapped_device *md, unsigned suspend_flags);
17b2f66f AK	213	int dm_resume(struct mapped_device *md);
	214
	215	/*
	216	* Event functions.
	217	*/
	218	uint32_t dm_get_event_nr(struct mapped_device *md);
	219	int dm_wait_event(struct mapped_device *md, int event_nr);
7a8c3d3b MA	220	uint32_t dm_next_uevent_seq(struct mapped_device *md);
7a8c3d3b MA	221	void dm_uevent_add(struct mapped_device md, struct list_head elist);
17b2f66f AK	222
	223	/*
	224	* Info functions.
	225	*/
72d94861	226	const char dm_device_name(struct mapped_device md);
96a1f7db	227	int dm_copy_name_and_uuid(struct mapped_device md, char name, char *uuid);
17b2f66f AK	228	struct gendisk dm_disk(struct mapped_device md);
17b2f66f AK	229	int dm_suspended(struct mapped_device *md);
2e93ccc1	230	int dm_noflush_suspending(struct dm_target *ti);
89343da0	231	union map_info dm_get_mapinfo(struct bio bio);
17b2f66f AK	232
	233	/*
	234	* Geometry functions.
	235	*/
	236	int dm_get_geometry(struct mapped_device md, struct hd_geometry geo);
	237	int dm_set_geometry(struct mapped_device md, struct hd_geometry geo);
	238
	239
	240	/*-----------------------------------------------------------------
	241	* Functions for manipulating device-mapper tables.
	242	---------------------------------------------------------------/
	243
	244	/*
	245	* First create an empty table.
	246	*/
aeb5d727	247	int dm_table_create(struct dm_table **result, fmode_t mode,
17b2f66f AK	248	unsigned num_targets, struct mapped_device *md);
	249
	250	/*
	251	* Then call this once for each target.
	252	*/
	253	int dm_table_add_target(struct dm_table t, const char type,
	254	sector_t start, sector_t len, char *params);
	255
	256	/*
	257	* Finally call this to make the table ready for use.
	258	*/
	259	int dm_table_complete(struct dm_table *t);
	260
ea0ec640 MP	261	/*
	262	* Unplug all devices in a table.
	263	*/
	264	void dm_table_unplug_all(struct dm_table *t);
	265
17b2f66f AK	266	/*
	267	* Table reference counting.
	268	*/
	269	struct dm_table dm_get_table(struct mapped_device md);
	270	void dm_table_get(struct dm_table *t);
	271	void dm_table_put(struct dm_table *t);
	272
	273	/*
	274	* Queries
	275	*/
	276	sector_t dm_table_get_size(struct dm_table *t);
	277	unsigned int dm_table_get_num_targets(struct dm_table *t);
aeb5d727	278	fmode_t dm_table_get_mode(struct dm_table *t);
17b2f66f AK	279	struct mapped_device dm_table_get_md(struct dm_table t);
	280
	281	/*
	282	* Trigger an event.
	283	*/
	284	void dm_table_event(struct dm_table *t);
	285
	286	/*
	287	* The device must be suspended before calling this method.
	288	*/
	289	int dm_swap_table(struct mapped_device md, struct dm_table t);
	290
54160904 MP	291	/*
	292	* A wrapper around vmalloc.
	293	*/
	294	void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
	295
0da336e5 AK	296	/*-----------------------------------------------------------------
	297	* Macros.
	298	---------------------------------------------------------------/
	299	#define DM_NAME "device-mapper"
	300
10d3bd09 MP	301	#define DMCRIT(f, arg...) \
	302	printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
	303
0da336e5 AK	304	#define DMERR(f, arg...) \
	305	printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
	306	#define DMERR_LIMIT(f, arg...) \
	307	do { \
	308	if (printk_ratelimit()) \
	309	printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \
	310	f "\n", ## arg); \
	311	} while (0)
	312
	313	#define DMWARN(f, arg...) \
	314	printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
	315	#define DMWARN_LIMIT(f, arg...) \
	316	do { \
	317	if (printk_ratelimit()) \
	318	printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \
	319	f "\n", ## arg); \
	320	} while (0)
	321
	322	#define DMINFO(f, arg...) \
	323	printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
	324	#define DMINFO_LIMIT(f, arg...) \
	325	do { \
	326	if (printk_ratelimit()) \
	327	printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \
	328	"\n", ## arg); \
	329	} while (0)
	330
	331	#ifdef CONFIG_DM_DEBUG
	332	# define DMDEBUG(f, arg...) \
	333	printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg)
	334	# define DMDEBUG_LIMIT(f, arg...) \
	335	do { \
	336	if (printk_ratelimit()) \
	337	printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \
	338	"\n", ## arg); \
	339	} while (0)
	340	#else
	341	# define DMDEBUG(f, arg...) do {} while (0)
	342	# define DMDEBUG_LIMIT(f, arg...) do {} while (0)
	343	#endif
	344
	345	#define DMEMIT(x...) sz += ((sz >= maxlen) ? \
	346	0 : scnprintf(result + sz, maxlen - sz, x))
	347
	348	#define SECTOR_SHIFT 9
	349
	350	/*
	351	* Definitions of return values from target end_io function.
	352	*/
	353	#define DM_ENDIO_INCOMPLETE 1
	354	#define DM_ENDIO_REQUEUE 2
	355
	356	/*
	357	* Definitions of return values from target map function.
	358	*/
	359	#define DM_MAPIO_SUBMITTED 0
	360	#define DM_MAPIO_REMAPPED 1
	361	#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE
	362
	363	/*
	364	* Ceiling(n / sz)
	365	*/
	366	#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
	367
368	#define dm_sector_div_up(n, sz) ( \
369	{ \
370	sector_t _r = ((n) + (sz) - 1); \
371	sector_div(_r, (sz)); \
372	_r; \
373	} \
374	)
375
376	/*
377	* ceiling(n / size) * size
378	*/
379	#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
380
d63a5ce3 MP	381	#define dm_array_too_big(fixed, obj, num) \
	382	((num) > (UINT_MAX - (fixed)) / (obj))
	383
0da336e5 AK	384	static inline sector_t to_sector(unsigned long n)
	385	{
	386	return (n >> SECTOR_SHIFT);
	387	}
	388
	389	static inline unsigned long to_bytes(sector_t n)
	390	{
	391	return (n << SECTOR_SHIFT);
	392	}
	393
17b2f66f	394	#endif /* _LINUX_DEVICE_MAPPER_H */