dm.c File Reference

#include "dm.h"
#include "dm-uevent.h"
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/moduleparam.h>
#include <linux/blkpg.h>
#include <linux/bio.h>
#include <linux/mempool.h>
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/hdreg.h>
#include <linux/delay.h>
#include <trace/events/block.h>

Go to the source code of this file.

Data Structures
struct	dm_io
struct	dm_target_io
struct	dm_rq_target_io
struct	dm_rq_clone_bio_info
struct	mapped_device
struct	dm_md_mempools
struct	clone_info

Macros
#define	DM_MSG_PREFIX   "core"
#define	DM_COOKIE_ENV_VAR_NAME   "DM_COOKIE"
#define	DM_COOKIE_LENGTH   24
#define	MINOR_ALLOCED   ((void *)-1)
#define	DMF_BLOCK_IO_FOR_SUSPEND   0
#define	DMF_SUSPENDED   1
#define	DMF_FROZEN   2
#define	DMF_FREEING   3
#define	DMF_DELETING   4
#define	DMF_NOFLUSH_SUSPENDING   5
#define	DMF_MERGE_IS_OPTIONAL   6
#define	MIN_IOS   256

Functions
union map_info *	dm_get_mapinfo (struct bio *bio)
union map_info *	dm_get_rq_mapinfo (struct request *rq)
	EXPORT_SYMBOL_GPL (dm_get_rq_mapinfo)
int	dm_deleting_md (struct mapped_device *md)
int	dm_open_count (struct mapped_device *md)
int	dm_lock_for_deletion (struct mapped_device *md)
struct dm_table *	dm_get_live_table (struct mapped_device *md)
int	dm_get_geometry (struct mapped_device *md, struct hd_geometry *geo)
int	dm_set_geometry (struct mapped_device *md, struct hd_geometry *geo)
void	dm_requeue_unmapped_request (struct request *clone)
	EXPORT_SYMBOL_GPL (dm_requeue_unmapped_request)
void	dm_kill_unmapped_request (struct request *clone, int error)
	EXPORT_SYMBOL_GPL (dm_kill_unmapped_request)
int	dm_set_target_max_io_len (struct dm_target *ti, sector_t len)
	EXPORT_SYMBOL_GPL (dm_set_target_max_io_len)
void	dm_dispatch_request (struct request *rq)
	EXPORT_SYMBOL_GPL (dm_dispatch_request)
int	dm_underlying_device_busy (struct request_queue *q)
	EXPORT_SYMBOL_GPL (dm_underlying_device_busy)
int	dm_queue_merge_is_compulsory (struct request_queue *q)
int	dm_create (int minor, struct mapped_device **result)
void	dm_lock_md_type (struct mapped_device *md)
void	dm_unlock_md_type (struct mapped_device *md)
void	dm_set_md_type (struct mapped_device *md, unsigned type)
unsigned	dm_get_md_type (struct mapped_device *md)
struct target_type *	dm_get_immutable_target_type (struct mapped_device *md)
int	dm_setup_md_queue (struct mapped_device *md)
struct mapped_device *	dm_get_md (dev_t dev)
	EXPORT_SYMBOL_GPL (dm_get_md)
void *	dm_get_mdptr (struct mapped_device *md)
void	dm_set_mdptr (struct mapped_device *md, void *ptr)
void	dm_get (struct mapped_device *md)
const char *	dm_device_name (struct mapped_device *md)
	EXPORT_SYMBOL_GPL (dm_device_name)
void	dm_destroy (struct mapped_device *md)
void	dm_destroy_immediate (struct mapped_device *md)
void	dm_put (struct mapped_device *md)
	EXPORT_SYMBOL_GPL (dm_put)
struct dm_table *	dm_swap_table (struct mapped_device *md, struct dm_table *table)
int	dm_suspend (struct mapped_device *md, unsigned suspend_flags)
int	dm_resume (struct mapped_device *md)
int	dm_kobject_uevent (struct mapped_device *md, enum kobject_action action, unsigned cookie)
uint32_t	dm_next_uevent_seq (struct mapped_device *md)
uint32_t	dm_get_event_nr (struct mapped_device *md)
int	dm_wait_event (struct mapped_device *md, int event_nr)
void	dm_uevent_add (struct mapped_device *md, struct list_head *elist)
struct gendisk *	dm_disk (struct mapped_device *md)
struct kobject *	dm_kobject (struct mapped_device *md)
struct mapped_device *	dm_get_from_kobject (struct kobject *kobj)
int	dm_suspended_md (struct mapped_device *md)
int	dm_suspended (struct dm_target *ti)
	EXPORT_SYMBOL_GPL (dm_suspended)
int	dm_noflush_suspending (struct dm_target *ti)
	EXPORT_SYMBOL_GPL (dm_noflush_suspending)
struct dm_md_mempools *	dm_alloc_md_mempools (unsigned type, unsigned integrity)
void	dm_free_md_mempools (struct dm_md_mempools *pools)
	EXPORT_SYMBOL (dm_get_mapinfo)
	module_init (dm_init)
	module_exit (dm_exit)
	module_param (major, uint, 0)
	MODULE_PARM_DESC (major,"The major number of the device mapper")
	MODULE_DESCRIPTION (DM_NAME" driver")
	MODULE_AUTHOR ("Joe Thornber <[email protected]>")
	MODULE_LICENSE ("GPL")

Macro Definition Documentation

#define DM_COOKIE_ENV_VAR_NAME   "DM_COOKIE"

Definition at line 41 of file dm.c.

#define DM_COOKIE_LENGTH   24

Definition at line 42 of file dm.c.

#define DM_MSG_PREFIX   "core"

Definition at line 25 of file dm.c.

#define DMF_BLOCK_IO_FOR_SUSPEND   0

Definition at line 123 of file dm.c.

#define DMF_DELETING   4

Definition at line 127 of file dm.c.

#define DMF_FREEING   3

Definition at line 126 of file dm.c.

#define DMF_FROZEN   2

Definition at line 125 of file dm.c.

#define DMF_MERGE_IS_OPTIONAL   6

Definition at line 129 of file dm.c.

#define DMF_NOFLUSH_SUSPENDING   5

Definition at line 128 of file dm.c.

#define DMF_SUSPENDED   1

Definition at line 124 of file dm.c.

#define MIN_IOS   256

Definition at line 216 of file dm.c.

#define MINOR_ALLOCED   ((void *)-1)

Definition at line 118 of file dm.c.

Function Documentation

struct dm_md_mempools* dm_alloc_md_mempools ( unsigned  type, unsigned  integrity  )

read

Definition at line 2714 of file dm.c.

int dm_create	(	int	minor,
		struct mapped_device **	result
	)

Definition at line 2127 of file dm.c.

int dm_deleting_md

(

struct mapped_device *

md

)

Definition at line 340 of file dm.c.

void dm_destroy

(

struct mapped_device *

md

)

Definition at line 2304 of file dm.c.

void dm_destroy_immediate

(

struct mapped_device *

md

)

Definition at line 2309 of file dm.c.

const char* dm_device_name

(

struct mapped_device *

md

)

Definition at line 2262 of file dm.c.

struct gendisk* dm_disk ( struct mapped_device *  md )

read

Definition at line 2667 of file dm.c.

void dm_dispatch_request

(

struct request *

rq

)

Definition at line 1446 of file dm.c.

void dm_free_md_mempools

(

struct dm_md_mempools *

pools

)

Definition at line 2764 of file dm.c.

void dm_get

(

struct mapped_device *

md

)

Definition at line 2256 of file dm.c.

uint32_t dm_get_event_nr

(

struct mapped_device *

md

)

Definition at line 2643 of file dm.c.

struct mapped_device* dm_get_from_kobject ( struct kobject *  kobj )

read

Definition at line 2681 of file dm.c.

int dm_get_geometry	(	struct mapped_device *	md,
		struct hd_geometry *	geo
	)

Definition at line 554 of file dm.c.

struct target_type* dm_get_immutable_target_type ( struct mapped_device *  md )

read

Definition at line 2165 of file dm.c.

struct dm_table* dm_get_live_table ( struct mapped_device *  md )

read

Definition at line 537 of file dm.c.

union map_info* dm_get_mapinfo ( struct bio *  bio )

write

Definition at line 103 of file dm.c.

struct mapped_device* dm_get_md ( dev_t  dev )

read

Definition at line 2235 of file dm.c.

unsigned dm_get_md_type

(

struct mapped_device *

md

)

Definition at line 2160 of file dm.c.

void* dm_get_mdptr

(

struct mapped_device *

md

)

Definition at line 2246 of file dm.c.

union map_info* dm_get_rq_mapinfo ( struct request *  rq )

write

Definition at line 110 of file dm.c.

void dm_kill_unmapped_request	(	struct request *	clone,
		int	error
	)

Definition at line 919 of file dm.c.

struct kobject* dm_kobject ( struct mapped_device *  md )

read

Definition at line 2672 of file dm.c.

int dm_kobject_uevent	(	struct mapped_device *	md,
		enum kobject_action	action,
		unsigned	cookie
	)

Definition at line 2622 of file dm.c.

int dm_lock_for_deletion

(

struct mapped_device *

md

)

Definition at line 392 of file dm.c.

void dm_lock_md_type

(

struct mapped_device *

md

)

Definition at line 2145 of file dm.c.

uint32_t dm_next_uevent_seq

(

struct mapped_device *

md

)

Definition at line 2638 of file dm.c.

int dm_noflush_suspending

(

struct dm_target *

ti

)

Definition at line 2708 of file dm.c.

int dm_open_count

(

struct mapped_device *

md

)

Definition at line 384 of file dm.c.

void dm_put

(

struct mapped_device *

md

)

Definition at line 2314 of file dm.c.

int dm_queue_merge_is_compulsory

(

struct request_queue *

q

)

Definition at line 2006 of file dm.c.

void dm_requeue_unmapped_request

(

struct request *

clone

)

Definition at line 808 of file dm.c.

int dm_resume

(

struct mapped_device *

md

)

Definition at line 2580 of file dm.c.

int dm_set_geometry	(	struct mapped_device *	md,
		struct hd_geometry *	geo
	)

Definition at line 564 of file dm.c.

void dm_set_md_type	(	struct mapped_device *	md,
		unsigned	type
	)

Definition at line 2155 of file dm.c.

void dm_set_mdptr	(	struct mapped_device *	md,
		void *	ptr
	)

Definition at line 2251 of file dm.c.

int dm_set_target_max_io_len	(	struct dm_target *	ti,
		sector_t	len
	)

Definition at line 987 of file dm.c.

int dm_setup_md_queue

(

struct mapped_device *

md

)

Definition at line 2199 of file dm.c.

int dm_suspend	(	struct mapped_device *	md,
		unsigned	suspend_flags
	)

Definition at line 2476 of file dm.c.

int dm_suspended

(

struct dm_target *

ti

)

Definition at line 2702 of file dm.c.

int dm_suspended_md

(

struct mapped_device *

md

)

Definition at line 2697 of file dm.c.

struct dm_table* dm_swap_table ( struct mapped_device *  md, struct dm_table *  table  )

read

Definition at line 2390 of file dm.c.

void dm_uevent_add	(	struct mapped_device *	md,
		struct list_head *	elist
	)

Definition at line 2654 of file dm.c.

int dm_underlying_device_busy

(

struct request_queue *

q

)

Definition at line 1671 of file dm.c.

void dm_unlock_md_type

(

struct mapped_device *

md

)

Definition at line 2150 of file dm.c.

int dm_wait_event	(	struct mapped_device *	md,
		int	event_nr
	)

Definition at line 2648 of file dm.c.

EXPORT_SYMBOL

(

dm_get_mapinfo

)

EXPORT_SYMBOL_GPL

(

dm_get_rq_mapinfo

)

EXPORT_SYMBOL_GPL

(

dm_requeue_unmapped_request

)

EXPORT_SYMBOL_GPL

(

dm_kill_unmapped_request

)

EXPORT_SYMBOL_GPL

(

dm_set_target_max_io_len

)

EXPORT_SYMBOL_GPL

(

dm_dispatch_request

)

EXPORT_SYMBOL_GPL

(

dm_underlying_device_busy

)

EXPORT_SYMBOL_GPL

(

dm_get_md

)

EXPORT_SYMBOL_GPL

(

dm_device_name

)

EXPORT_SYMBOL_GPL

(

dm_put

)

EXPORT_SYMBOL_GPL

(

dm_suspended

)

EXPORT_SYMBOL_GPL

(

dm_noflush_suspending

)

MODULE_AUTHOR

(

"Joe Thornber <[email protected]>"

)

MODULE_DESCRIPTION

(

DM_NAME" driver"

)

module_exit

(

dm_exit

)

module_init

(

dm_init

)

MODULE_LICENSE

(

"GPL"

)

module_param	(	major	,
		uint	,
		0
	)

MODULE_PARM_DESC	(	major	,
		"The major number of the device mapper"
	)