dm-bufio.c File Reference

#include "dm-bufio.h"
#include <linux/device-mapper.h>
#include <linux/dm-io.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/shrinker.h>
#include <linux/module.h>

Go to the source code of this file.

Data Structures
struct	dm_bufio_client
struct	dm_buffer

Macros
#define	DM_MSG_PREFIX   "bufio"
#define	DM_BUFIO_MIN_BUFFERS   8
#define	DM_BUFIO_MEMORY_PERCENT   2
#define	DM_BUFIO_VMALLOC_PERCENT   25
#define	DM_BUFIO_WRITEBACK_PERCENT   75
#define	DM_BUFIO_WORK_TIMER_SECS   10
#define	DM_BUFIO_DEFAULT_AGE_SECS   60
#define	DM_BUFIO_INLINE_VECS   16
#define	DM_BUFIO_HASH_BITS   20
#define	DM_BUFIO_HASH(block)
#define	DM_BUFIO_BLOCK_SIZE_SLAB_LIMIT   (PAGE_SIZE >> 1)
#define	DM_BUFIO_BLOCK_SIZE_GFP_LIMIT   (PAGE_SIZE << (MAX_ORDER - 1))
#define	LIST_CLEAN   0
#define	LIST_DIRTY   1
#define	LIST_SIZE   2
#define	B_READING   0
#define	B_WRITING   1
#define	B_DIRTY   2
#define	DM_BUFIO_CACHE(c)   (dm_bufio_caches[dm_bufio_cache_index(c)])
#define	DM_BUFIO_CACHE_NAME(c)   (dm_bufio_cache_names[dm_bufio_cache_index(c)])
#define	dm_bufio_in_request()   (!!current->bio_list)
#define	dm_bufio_cond_resched()   do { } while (0)

Enumerations
enum	data_mode { DATA_MODE_SLAB = 0, DATA_MODE_GET_FREE_PAGES = 1, DATA_MODE_VMALLOC = 2, DATA_MODE_LIMIT = 3 }
enum	new_flag { NF_FRESH = 0, NF_READ = 1, NF_GET = 2, NF_PREFETCH = 3 }

Functions
void *	dm_bufio_get (struct dm_bufio_client *c, sector_t block, struct dm_buffer **bp)
	EXPORT_SYMBOL_GPL (dm_bufio_get)
void *	dm_bufio_read (struct dm_bufio_client *c, sector_t block, struct dm_buffer **bp)
	EXPORT_SYMBOL_GPL (dm_bufio_read)
void *	dm_bufio_new (struct dm_bufio_client *c, sector_t block, struct dm_buffer **bp)
	EXPORT_SYMBOL_GPL (dm_bufio_new)
void	dm_bufio_prefetch (struct dm_bufio_client *c, sector_t block, unsigned n_blocks)
	EXPORT_SYMBOL_GPL (dm_bufio_prefetch)
void	dm_bufio_release (struct dm_buffer *b)
	EXPORT_SYMBOL_GPL (dm_bufio_release)
void	dm_bufio_mark_buffer_dirty (struct dm_buffer *b)
	EXPORT_SYMBOL_GPL (dm_bufio_mark_buffer_dirty)
void	dm_bufio_write_dirty_buffers_async (struct dm_bufio_client *c)
	EXPORT_SYMBOL_GPL (dm_bufio_write_dirty_buffers_async)
int	dm_bufio_write_dirty_buffers (struct dm_bufio_client *c)
	EXPORT_SYMBOL_GPL (dm_bufio_write_dirty_buffers)
int	dm_bufio_issue_flush (struct dm_bufio_client *c)
	EXPORT_SYMBOL_GPL (dm_bufio_issue_flush)
void	dm_bufio_release_move (struct dm_buffer *b, sector_t new_block)
	EXPORT_SYMBOL_GPL (dm_bufio_release_move)
unsigned	dm_bufio_get_block_size (struct dm_bufio_client *c)
	EXPORT_SYMBOL_GPL (dm_bufio_get_block_size)
sector_t	dm_bufio_get_device_size (struct dm_bufio_client *c)
	EXPORT_SYMBOL_GPL (dm_bufio_get_device_size)
sector_t	dm_bufio_get_block_number (struct dm_buffer *b)
	EXPORT_SYMBOL_GPL (dm_bufio_get_block_number)
void *	dm_bufio_get_block_data (struct dm_buffer *b)
	EXPORT_SYMBOL_GPL (dm_bufio_get_block_data)
void *	dm_bufio_get_aux_data (struct dm_buffer *b)
	EXPORT_SYMBOL_GPL (dm_bufio_get_aux_data)
struct dm_bufio_client *	dm_bufio_get_client (struct dm_buffer *b)
	EXPORT_SYMBOL_GPL (dm_bufio_get_client)
struct dm_bufio_client *	dm_bufio_client_create (struct block_device *bdev, unsigned block_size, unsigned reserved_buffers, unsigned aux_size, void(*alloc_callback)(struct dm_buffer *), void(*write_callback)(struct dm_buffer *))
	EXPORT_SYMBOL_GPL (dm_bufio_client_create)
void	dm_bufio_client_destroy (struct dm_bufio_client *c)
	EXPORT_SYMBOL_GPL (dm_bufio_client_destroy)

Macro Definition Documentation

#define B_DIRTY   2

Definition at line 121 of file dm-bufio.c.

#define B_READING   0

Definition at line 119 of file dm-bufio.c.

#define B_WRITING   1

Definition at line 120 of file dm-bufio.c.

#define DM_BUFIO_BLOCK_SIZE_GFP_LIMIT   (PAGE_SIZE << (MAX_ORDER - 1))

Definition at line 63 of file dm-bufio.c.

#define DM_BUFIO_BLOCK_SIZE_SLAB_LIMIT   (PAGE_SIZE >> 1)

Definition at line 62 of file dm-bufio.c.

#define DM_BUFIO_CACHE

(

c

)

(dm_bufio_caches[dm_bufio_cache_index(c)])

Definition at line 166 of file dm-bufio.c.

#define DM_BUFIO_CACHE_NAME

(

c

)

(dm_bufio_cache_names[dm_bufio_cache_index(c)])

Definition at line 167 of file dm-bufio.c.

#define dm_bufio_cond_resched

(

)

do { } while (0)

Definition at line 196 of file dm-bufio.c.

#define DM_BUFIO_DEFAULT_AGE_SECS   60

Definition at line 42 of file dm-bufio.c.

#define DM_BUFIO_HASH

(

block

)

Value:

((((block) >> DM_BUFIO_HASH_BITS) ^ (block)) & \
     ((1 << DM_BUFIO_HASH_BITS) - 1))

Definition at line 54 of file dm-bufio.c.

#define DM_BUFIO_HASH_BITS   20

Definition at line 53 of file dm-bufio.c.

#define dm_bufio_in_request

(

)

(!!current->bio_list)

Definition at line 169 of file dm-bufio.c.

#define DM_BUFIO_INLINE_VECS   16

Definition at line 48 of file dm-bufio.c.

#define DM_BUFIO_MEMORY_PERCENT   2

Definition at line 30 of file dm-bufio.c.

#define DM_BUFIO_MIN_BUFFERS   8

Definition at line 28 of file dm-bufio.c.

#define DM_BUFIO_VMALLOC_PERCENT   25

Definition at line 31 of file dm-bufio.c.

#define DM_BUFIO_WORK_TIMER_SECS   10

Definition at line 37 of file dm-bufio.c.

#define DM_BUFIO_WRITEBACK_PERCENT   75

Definition at line 32 of file dm-bufio.c.

#define DM_MSG_PREFIX   "bufio"

Definition at line 18 of file dm-bufio.c.

#define LIST_CLEAN   0

Definition at line 68 of file dm-bufio.c.

#define LIST_DIRTY   1

Definition at line 69 of file dm-bufio.c.

#define LIST_SIZE   2

Definition at line 70 of file dm-bufio.c.

Enumeration Type Documentation

enum data_mode

Enumerator:

DATA_MODE_SLAB
DATA_MODE_GET_FREE_PAGES
DATA_MODE_VMALLOC
DATA_MODE_LIMIT

Definition at line 128 of file dm-bufio.c.

enum new_flag

Enumerator:

NF_FRESH
NF_READ
NF_GET
NF_PREFETCH

Definition at line 697 of file dm-bufio.c.

Function Documentation

struct dm_bufio_client* dm_bufio_client_create ( struct block_device *  bdev, unsigned  block_size, unsigned  reserved_buffers, unsigned  aux_size, void(*)(struct dm_buffer *)  alloc_callback, void(*)(struct dm_buffer *)  write_callback  )

read

Definition at line 1423 of file dm-bufio.c.

void dm_bufio_client_destroy

(

struct dm_bufio_client *

c

)

Definition at line 1548 of file dm-bufio.c.

void* dm_bufio_get	(	struct dm_bufio_client *	c,
		sector_t	block,
		struct dm_buffer **	bp
	)

Definition at line 999 of file dm-bufio.c.

void* dm_bufio_get_aux_data

(

struct dm_buffer *

b

)

Definition at line 1312 of file dm-bufio.c.

void* dm_bufio_get_block_data

(

struct dm_buffer *

b

)

Definition at line 1306 of file dm-bufio.c.

sector_t dm_bufio_get_block_number

(

struct dm_buffer *

b

)

Definition at line 1300 of file dm-bufio.c.

unsigned dm_bufio_get_block_size

(

struct dm_bufio_client *

c

)

Definition at line 1287 of file dm-bufio.c.

struct dm_bufio_client* dm_bufio_get_client ( struct dm_buffer *  b )

read

Definition at line 1318 of file dm-bufio.c.

sector_t dm_bufio_get_device_size

(

struct dm_bufio_client *

c

)

Definition at line 1293 of file dm-bufio.c.

int dm_bufio_issue_flush

(

struct dm_bufio_client *

c

)

Definition at line 1193 of file dm-bufio.c.

void dm_bufio_mark_buffer_dirty

(

struct dm_buffer *

b

)

Definition at line 1089 of file dm-bufio.c.

void* dm_bufio_new	(	struct dm_bufio_client *	c,
		sector_t	block,
		struct dm_buffer **	bp
	)

Definition at line 1015 of file dm-bufio.c.

void dm_bufio_prefetch	(	struct dm_bufio_client *	c,
		sector_t	block,
		unsigned	n_blocks
	)

Definition at line 1024 of file dm-bufio.c.

void* dm_bufio_read	(	struct dm_bufio_client *	c,
		sector_t	block,
		struct dm_buffer **	bp
	)

Definition at line 1006 of file dm-bufio.c.

void dm_bufio_release

(

struct dm_buffer *

b

)

Definition at line 1059 of file dm-bufio.c.

void dm_bufio_release_move	(	struct dm_buffer *	b,
		sector_t	new_block
	)

Definition at line 1225 of file dm-bufio.c.

int dm_bufio_write_dirty_buffers

(

struct dm_bufio_client *

c

)

Definition at line 1121 of file dm-bufio.c.

void dm_bufio_write_dirty_buffers_async

(

struct dm_bufio_client *

c

)

Definition at line 1104 of file dm-bufio.c.

EXPORT_SYMBOL_GPL

(

dm_bufio_get

)

EXPORT_SYMBOL_GPL

(

dm_bufio_read

)

EXPORT_SYMBOL_GPL

(

dm_bufio_new

)

EXPORT_SYMBOL_GPL

(

dm_bufio_prefetch

)

EXPORT_SYMBOL_GPL

(

dm_bufio_release

)

EXPORT_SYMBOL_GPL

(

dm_bufio_mark_buffer_dirty

)

EXPORT_SYMBOL_GPL

(

dm_bufio_write_dirty_buffers_async

)

EXPORT_SYMBOL_GPL

(

dm_bufio_write_dirty_buffers

)

EXPORT_SYMBOL_GPL

(

dm_bufio_issue_flush

)

EXPORT_SYMBOL_GPL

(

dm_bufio_release_move

)

EXPORT_SYMBOL_GPL

(

dm_bufio_get_block_size

)

EXPORT_SYMBOL_GPL

(

dm_bufio_get_device_size

)

EXPORT_SYMBOL_GPL

(

dm_bufio_get_block_number

)

EXPORT_SYMBOL_GPL

(

dm_bufio_get_block_data

)

EXPORT_SYMBOL_GPL

(

dm_bufio_get_aux_data

)

EXPORT_SYMBOL_GPL

(

dm_bufio_get_client

)

EXPORT_SYMBOL_GPL

(

dm_bufio_client_create

)

EXPORT_SYMBOL_GPL

(

dm_bufio_client_destroy

)