[deliverable/linux.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;
};

/*
 * 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
 */
#define DM_TARGET_SUPPORTS_BARRIERS 0x00000001

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;
};

struct io_restrictions {
	unsigned long bounce_pfn;
	unsigned long seg_boundary_mask;
	unsigned max_hw_sectors;
	unsigned max_sectors;
	unsigned max_segment_size;
	unsigned short hardsect_size;
	unsigned short max_hw_segments;
	unsigned short max_phys_segments;
	unsigned char no_cluster; /* inverted so that 0 is default */
};

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 io_restrictions */
	/* Always a power of 2 */
	sector_t split_io;

	/*
	 * These are automatically filled in by
	 * dm_table_get_device.
	 */
	struct io_restrictions 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;
	24	};
	25
	26	/*
	27	* In the constructor the target parameter will already have the
	28	* table, type, begin and len fields filled in.
	29	*/
	30	typedef int (dm_ctr_fn) (struct dm_target target,
	31	unsigned int argc, char **argv);
	32
	33	/*
	34	* The destructor doesn't need to free the dm_target, just
	35	* anything hidden ti->private.
	36	*/
	37	typedef void (dm_dtr_fn) (struct dm_target ti);
	38
	39	/*
	40	* The map function must return:
	41	* < 0: error
	42	* = 0: The target will handle the io by resubmitting it later
45cbcd79	43	* = 1: simple remap complete
2e93ccc1	44	* = 2: The target wants to push back the io
1da177e4 LT	45	*/
	46	typedef int (dm_map_fn) (struct dm_target ti, struct bio *bio,
	47	union map_info *map_context);
7d76345d KU	48	typedef int (dm_map_request_fn) (struct dm_target ti, struct request *clone,
7d76345d KU	49	union map_info *map_context);
1da177e4 LT	50
	51	/*
	52	* Returns:
	53	* < 0 : error (currently ignored)
	54	* 0 : ended successfully
	55	* 1 : for some reason the io has still not completed (eg,
	56	* multipath target might want to requeue a failed io).
2e93ccc1	57	* 2 : The target wants to push back the io
1da177e4 LT	58	*/
	59	typedef int (dm_endio_fn) (struct dm_target ti,
	60	struct bio *bio, int error,
	61	union map_info *map_context);
7d76345d KU	62	typedef int (dm_request_endio_fn) (struct dm_target ti,
	63	struct request *clone, int error,
	64	union map_info *map_context);
1da177e4	65
999d8168	66	typedef void (dm_flush_fn) (struct dm_target ti);
1da177e4 LT	67	typedef void (dm_presuspend_fn) (struct dm_target ti);
1da177e4 LT	68	typedef void (dm_postsuspend_fn) (struct dm_target ti);
8757b776	69	typedef int (dm_preresume_fn) (struct dm_target ti);
1da177e4 LT	70	typedef void (dm_resume_fn) (struct dm_target ti);
	71
	72	typedef int (dm_status_fn) (struct dm_target ti, status_type_t status_type,
	73	char *result, unsigned int maxlen);
	74
	75	typedef int (dm_message_fn) (struct dm_target ti, unsigned argc, char **argv);
	76
647b3d00	77	typedef int (dm_ioctl_fn) (struct dm_target ti, unsigned int cmd,
aa129a22 MB	78	unsigned long arg);
aa129a22 MB	79
f6fccb12 MB	80	typedef int (dm_merge_fn) (struct dm_target ti, struct bvec_merge_data *bvm,
	81	struct bio_vec *biovec, int max_size);
	82
7d76345d KU	83	/*
	84	* Returns:
	85	* 0: The target can handle the next I/O immediately.
	86	* 1: The target can't handle the next I/O immediately.
	87	*/
	88	typedef int (dm_busy_fn) (struct dm_target ti);
	89
1da177e4 LT	90	void dm_error(const char *message);
1da177e4 LT	91
3cb40214 BR	92	/*
	93	* Combine device limits.
	94	*/
	95	void dm_set_device_limits(struct dm_target ti, struct block_device bdev);
	96
82b1519b MP	97	struct dm_dev {
82b1519b MP	98	struct block_device *bdev;
aeb5d727	99	fmode_t mode;
82b1519b MP	100	char name[16];
	101	};
	102
1da177e4 LT	103	/*
	104	* Constructors should call these functions to ensure destination devices
	105	* are opened/closed correctly.
	106	* FIXME: too many arguments.
	107	*/
	108	int dm_get_device(struct dm_target ti, const char path, sector_t start,
aeb5d727	109	sector_t len, fmode_t mode, struct dm_dev **result);
1da177e4 LT	110	void dm_put_device(struct dm_target ti, struct dm_dev d);
	111
	112	/*
	113	* Information about a target type
	114	*/
ab4c1424 AK	115
	116	/*
	117	* Target features
	118	*/
	119	#define DM_TARGET_SUPPORTS_BARRIERS 0x00000001
	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;
1da177e4 LT	142	};
	143
	144	struct io_restrictions {
4f41b09f VA	145	unsigned long bounce_pfn;
	146	unsigned long seg_boundary_mask;
	147	unsigned max_hw_sectors;
	148	unsigned max_sectors;
	149	unsigned max_segment_size;
	150	unsigned short hardsect_size;
	151	unsigned short max_hw_segments;
	152	unsigned short max_phys_segments;
	153	unsigned char no_cluster; /* inverted so that 0 is default */
1da177e4 LT	154	};
	155
	156	struct dm_target {
	157	struct dm_table *table;
	158	struct target_type *type;
	159
	160	/* target limits */
	161	sector_t begin;
	162	sector_t len;
	163
	164	/* FIXME: turn this into a mask, and merge with io_restrictions */
	165	/* Always a power of 2 */
	166	sector_t split_io;
	167
	168	/*
	169	* These are automatically filled in by
	170	* dm_table_get_device.
	171	*/
	172	struct io_restrictions limits;
	173
	174	/* target specific data */
	175	void *private;
	176
	177	/* Used to provide an error string from the ctr */
	178	char *error;
	179	};
	180
	181	int dm_register_target(struct target_type *t);
10d3bd09	182	void dm_unregister_target(struct target_type *t);
17b2f66f AK	183
	184	/*-----------------------------------------------------------------
	185	* Functions for creating and manipulating mapped devices.
	186	* Drop the reference with dm_put when you finish with the object.
	187	---------------------------------------------------------------/
	188
	189	/*
	190	* DM_ANY_MINOR chooses the next available minor number.
	191	*/
	192	#define DM_ANY_MINOR (-1)
	193	int dm_create(int minor, struct mapped_device **md);
	194
	195	/*
	196	* Reference counting for md.
	197	*/
	198	struct mapped_device *dm_get_md(dev_t dev);
	199	void dm_get(struct mapped_device *md);
	200	void dm_put(struct mapped_device *md);
	201
	202	/*
	203	* An arbitrary pointer may be stored alongside a mapped device.
	204	*/
	205	void dm_set_mdptr(struct mapped_device md, void ptr);
	206	void dm_get_mdptr(struct mapped_device md);
	207
	208	/*
	209	* A device can still be used while suspended, but I/O is deferred.
	210	*/
a3d77d35	211	int dm_suspend(struct mapped_device *md, unsigned suspend_flags);
17b2f66f AK	212	int dm_resume(struct mapped_device *md);
	213
	214	/*
	215	* Event functions.
	216	*/
	217	uint32_t dm_get_event_nr(struct mapped_device *md);
	218	int dm_wait_event(struct mapped_device *md, int event_nr);
7a8c3d3b MA	219	uint32_t dm_next_uevent_seq(struct mapped_device *md);
7a8c3d3b MA	220	void dm_uevent_add(struct mapped_device md, struct list_head elist);
17b2f66f AK	221
	222	/*
	223	* Info functions.
	224	*/
72d94861	225	const char dm_device_name(struct mapped_device md);
96a1f7db	226	int dm_copy_name_and_uuid(struct mapped_device md, char name, char *uuid);
17b2f66f AK	227	struct gendisk dm_disk(struct mapped_device md);
17b2f66f AK	228	int dm_suspended(struct mapped_device *md);
2e93ccc1	229	int dm_noflush_suspending(struct dm_target *ti);
89343da0	230	union map_info dm_get_mapinfo(struct bio bio);
17b2f66f AK	231
	232	/*
	233	* Geometry functions.
	234	*/
	235	int dm_get_geometry(struct mapped_device md, struct hd_geometry geo);
	236	int dm_set_geometry(struct mapped_device md, struct hd_geometry geo);
	237
	238
	239	/*-----------------------------------------------------------------
	240	* Functions for manipulating device-mapper tables.
	241	---------------------------------------------------------------/
	242
	243	/*
	244	* First create an empty table.
	245	*/
aeb5d727	246	int dm_table_create(struct dm_table **result, fmode_t mode,
17b2f66f AK	247	unsigned num_targets, struct mapped_device *md);
	248
	249	/*
	250	* Then call this once for each target.
	251	*/
	252	int dm_table_add_target(struct dm_table t, const char type,
	253	sector_t start, sector_t len, char *params);
	254
	255	/*
	256	* Finally call this to make the table ready for use.
	257	*/
	258	int dm_table_complete(struct dm_table *t);
	259
ea0ec640 MP	260	/*
	261	* Unplug all devices in a table.
	262	*/
	263	void dm_table_unplug_all(struct dm_table *t);
	264
17b2f66f AK	265	/*
	266	* Table reference counting.
	267	*/
	268	struct dm_table dm_get_table(struct mapped_device md);
	269	void dm_table_get(struct dm_table *t);
	270	void dm_table_put(struct dm_table *t);
	271
	272	/*
	273	* Queries
	274	*/
	275	sector_t dm_table_get_size(struct dm_table *t);
	276	unsigned int dm_table_get_num_targets(struct dm_table *t);
aeb5d727	277	fmode_t dm_table_get_mode(struct dm_table *t);
17b2f66f AK	278	struct mapped_device dm_table_get_md(struct dm_table t);
	279
	280	/*
	281	* Trigger an event.
	282	*/
	283	void dm_table_event(struct dm_table *t);
	284
	285	/*
	286	* The device must be suspended before calling this method.
	287	*/
	288	int dm_swap_table(struct mapped_device md, struct dm_table t);
	289
54160904 MP	290	/*
	291	* A wrapper around vmalloc.
	292	*/
	293	void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
	294
0da336e5 AK	295	/*-----------------------------------------------------------------
	296	* Macros.
	297	---------------------------------------------------------------/
	298	#define DM_NAME "device-mapper"
	299
10d3bd09 MP	300	#define DMCRIT(f, arg...) \
	301	printk(KERN_CRIT DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
	302
0da336e5 AK	303	#define DMERR(f, arg...) \
	304	printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
	305	#define DMERR_LIMIT(f, arg...) \
	306	do { \
	307	if (printk_ratelimit()) \
	308	printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \
	309	f "\n", ## arg); \
	310	} while (0)
	311
	312	#define DMWARN(f, arg...) \
	313	printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
	314	#define DMWARN_LIMIT(f, arg...) \
	315	do { \
	316	if (printk_ratelimit()) \
	317	printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \
	318	f "\n", ## arg); \
	319	} while (0)
	320
	321	#define DMINFO(f, arg...) \
	322	printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
	323	#define DMINFO_LIMIT(f, arg...) \
	324	do { \
	325	if (printk_ratelimit()) \
	326	printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \
	327	"\n", ## arg); \
	328	} while (0)
	329
	330	#ifdef CONFIG_DM_DEBUG
	331	# define DMDEBUG(f, arg...) \
	332	printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg)
	333	# define DMDEBUG_LIMIT(f, arg...) \
	334	do { \
	335	if (printk_ratelimit()) \
	336	printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \
	337	"\n", ## arg); \
	338	} while (0)
	339	#else
	340	# define DMDEBUG(f, arg...) do {} while (0)
	341	# define DMDEBUG_LIMIT(f, arg...) do {} while (0)
	342	#endif
	343
	344	#define DMEMIT(x...) sz += ((sz >= maxlen) ? \
	345	0 : scnprintf(result + sz, maxlen - sz, x))
	346
	347	#define SECTOR_SHIFT 9
	348
	349	/*
	350	* Definitions of return values from target end_io function.
	351	*/
	352	#define DM_ENDIO_INCOMPLETE 1
	353	#define DM_ENDIO_REQUEUE 2
	354
	355	/*
	356	* Definitions of return values from target map function.
	357	*/
	358	#define DM_MAPIO_SUBMITTED 0
	359	#define DM_MAPIO_REMAPPED 1
	360	#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE
	361
	362	/*
	363	* Ceiling(n / sz)
	364	*/
	365	#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
	366
367	#define dm_sector_div_up(n, sz) ( \
368	{ \
369	sector_t _r = ((n) + (sz) - 1); \
370	sector_div(_r, (sz)); \
371	_r; \
372	} \
373	)
374
375	/*
376	* ceiling(n / size) * size
377	*/
378	#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
379
d63a5ce3 MP	380	#define dm_array_too_big(fixed, obj, num) \
	381	((num) > (UINT_MAX - (fixed)) / (obj))
	382
0da336e5 AK	383	static inline sector_t to_sector(unsigned long n)
	384	{
	385	return (n >> SECTOR_SHIFT);
	386	}
	387
	388	static inline unsigned long to_bytes(sector_t n)
	389	{
	390	return (n << SECTOR_SHIFT);
	391	}
	392
17b2f66f	393	#endif /* _LINUX_DEVICE_MAPPER_H */