bcache.h 文件参考

#include "pthread.h"
#include "linux/rbtree.h"
#include "los_list.h"
#include "los_atomic.h"
#include "inode/inode.h"

bcache.h 的引用(Include)关系图:

浏览源代码.

结构体
struct	OsBcacheBlock
struct	tagOsBcache

宏定义
#define	ALIGN_LIB(x)   (((x) + (HALARC_ALIGNMENT - 1)) & ~(HALARC_ALIGNMENT - 1))
#define	ALIGN_DISP(x)   (HALARC_ALIGNMENT - ((x) & (HALARC_ALIGNMENT - 1)))
#define	UNSIGNED_INTEGER_BITS   32
#define	UNINT_MAX_SHIFT_BITS   31
#define	UNINT_LOG2_SHIFT   5
#define	EVEN_JUDGED   2
#define	PERCENTAGE   100

类型定义
typedef INT32(*	BcacheReadFun) (struct inode *, UINT8 *, UINT32, UINT64)
typedef INT32(*	BcacheWriteFun) (struct inode *, const UINT8 *, UINT32, UINT64)
typedef INT32(*	BcacheWritevFun) (struct inode *, const struct iovec *, UINT32, UINT64)
typedef struct tagOsBcache	OsBcache

函数
INT32	BlockCacheRead (OsBcache *bc, UINT8 *buf, UINT32 *len, UINT64 num, UINT64 pos)
INT32	BlockCacheWrite (OsBcache *bc, const UINT8 *buf, UINT32 *len, UINT64 num, UINT64 pos)
INT32	BlockCacheSync (OsBcache *bc)
OsBcache *	BlockCacheInit (struct inode *devNode, UINT32 sectorSize, UINT32 sectorPerBlock, UINT32 blockNum, UINT64 blockCount)
VOID	BlockCacheDeinit (OsBcache *bc)
INT32	OsSdSync (INT32 id)

宏定义说明

ALIGN_DISP

#define ALIGN_DISP

(

x

)

(HALARC_ALIGNMENT - ((x) & (HALARC_ALIGNMENT - 1)))

ALIGN_LIB

#define ALIGN_LIB

(

x

)

(((x) + (HALARC_ALIGNMENT - 1)) & ~(HALARC_ALIGNMENT - 1))

EVEN_JUDGED

#define EVEN_JUDGED   2

PERCENTAGE

#define PERCENTAGE   100

UNINT_LOG2_SHIFT

#define UNINT_LOG2_SHIFT   5

UNINT_MAX_SHIFT_BITS

#define UNINT_MAX_SHIFT_BITS   31

UNSIGNED_INTEGER_BITS

#define UNSIGNED_INTEGER_BITS   32

类型定义说明

BcacheReadFun

typedef INT32(* BcacheReadFun) (struct inode *, UINT8 *, UINT32, UINT64)

BcacheWriteFun

typedef INT32(* BcacheWriteFun) (struct inode *, const UINT8 *, UINT32, UINT64)

BcacheWritevFun

typedef INT32(* BcacheWritevFun) (struct inode *, const struct iovec *, UINT32, UINT64)

OsBcache

typedef struct tagOsBcache OsBcache

函数说明

BlockCacheDeinit()

VOID BlockCacheDeinit

(

OsBcache *

bc

)

Description:

The BlockCacheDeinit() function shall deinit the bcache and release resources.

参数

bc	[IN] block cache instance

注意

• None.

返回值

VOID

None.

Dependency:

• bcache.h

自从

Huawei LiteOS V200R001C00

BlockCacheInit()

OsBcache * BlockCacheInit	(	struct inode *	devNode,
		UINT32	sectorSize,
		UINT32	sectorPerBlock,
		UINT32	blockNum,
		UINT64	blockCount
	)

Description:

The BlockCacheInit() function shall alloc memory for bcache and init it.

参数

devNode	[IN] dev node instance
sectorSize	[IN] size of a sector
sectorPerBlock	[IN] sector count per block in bcache
blockNum	[IN] block number of bcache
blockCount	[IN] block count of the disk

注意

• None.

返回值

OsBcache	* init succeded
NULL	init failed

Dependency:

• bcache.h

自从

Huawei LiteOS V200R001C00

BlockCacheRead()

INT32 BlockCacheRead	(	OsBcache *	bc,
		UINT8 *	buf,
		UINT32 *	len,
		UINT64	num,
		UINT64	pos
	)

Description:

The BlockCacheRead() function shall read data from the bcache, and if it doesn't hit, read the data from disk.

参数

bc	[IN] block cache instance
buf	[OUT] data buffer ptr
len	[IN] number of bytes to read
num	[IN] starting block number
pos	[IN] starting position inside starting block

注意

• The block number is automatically adjusted if position is greater than block size.

返回值

#0	read succeded
INT32	read failed

Dependency:

• bcache.h

自从

Huawei LiteOS V200R001C00

BlockCacheSync()

INT32 BlockCacheSync

(

OsBcache *

bc

)

Description:

The BlockCacheSync() function shall write-back all dirty data in the bcache into the disk.

参数

bc	[IN] block cache instance

注意

• None.

返回值

#0	sync succeded
INT32	sync failed

Dependency:

• bcache.h

自从

Huawei LiteOS V200R001C00

BlockCacheWrite()

INT32 BlockCacheWrite	(	OsBcache *	bc,
		const UINT8 *	buf,
		UINT32 *	len,
		UINT64	num,
		UINT64	pos
	)

Description:

The BlockCacheWrite() function shall write data to the bcache.

参数

bc	[IN] block cache instance
buf	[IN] data buffer ptr
len	[IN] number of bytes to write
num	[IN] starting block number
pos	[IN] starting position inside starting block

注意

• The block number is automatically adjusted if position is greater than block size.

返回值

#0	write succeded
INT32	write failed

Dependency:

• bcache.h

自从

Huawei LiteOS V200R001C00

OsSdSync()

INT32 OsSdSync

(

INT32

id

)