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me2fs_block.h
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/*********************************************************************************
File : me2fs_block.h
Description : Definitions for block group operations
*********************************************************************************/
#ifndef __ME2FS_BLOCK_H__
#define __ME2FS_BLOCK_H__
#include "me2fs.h"
/*
==================================================================================
Prototype Statement
==================================================================================
*/
/*
==================================================================================
DEFINES
==================================================================================
*/
/*
==================================================================================
Management
==================================================================================
*/
/*
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
< Open Functions >
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
*/
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsGetGroupDescriptor
Input :struct super_block *sb
< vfs super block >
unsigned int block_group
< block group number >
Output :void
Return :struct ext2_group_desc*
< goup descriptor >
Description :get group descriptor
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
struct ext2_group_desc*
me2fsGetGroupDescriptor( struct super_block *sb,
unsigned int block_group );
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsGetGdescBufferCache
Input :struct super_block *sb
< vfs super block >
unsigned int block group
< block group number >
Output :void
Return :struct buffer_head*
< buffer cache to which the block descriptor belongs >
Description :get buffer cache the block descriptor belongs to
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
struct buffer_head*
me2fsGetGdescBufferCache( struct super_block *sb, unsigned int block_group );
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsHasBgSuper
Input :struct super_block *sb
< vfs super block >
int gourp
< group number >
Output :void
Return :int
< result >
Description :does block goup have super block?
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
int me2fsHasBgSuper( struct super_block *sb, int group );
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsCountFreeBlocks
Input :struct super_block *sb
< vfs super block >
Output :void
Return :unsigned long
< number of free blocks in file system >
Description :count number of free blocks in file system
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
unsigned long me2fsCountFreeBlocks( struct super_block *sb );
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsNewBlocks
Input :struct inode *inode
< vfs inode >
unsigned long goal
< block number of goal >
unsinged long *count
< number of allocating block >
int *err
< result >
Output :int *err
< result >
Return :unsigned long
< filesystem-wide allocated block >
Description :core block(s) allocation function
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
unsigned long
me2fsNewBlocks( struct inode *inode,
unsigned goal,
unsigned long *count,
int*err );
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsFreeblocks
Input :struct inode *inode
< vfs inode to free blocks >
unsigned long block_num
< block number to start to free blocks >
unsigned long count
< number of blocks to free >
Output :void
Return :void
Description :free blocks
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
void me2fsFreeBlocks( struct inode *inode,
unsigned long block_num,
unsigned long count );
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsGetBlocksUsedByGroupTable
Input :struct super_block *sb
< vfs super block >
int group
< goupr number >
Output :void
Return :void
Description :get number of blocks used by the group table in group
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
unsigned long
me2fsGetBlocksUsedByGroupTable( struct super_block *sb, int group );
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsInitBlockAllocInfo
Input :struct inode *inode
< vfs inode >
Output :void
Return :void
Description :allocate block_alloc_info
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
void me2fsInitBlockAllocInfo( struct inode *inode );
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsInsertReserveWindow
Input :struct superbe_block *sb
< vfs super block >
struct ext2_reserve_window_node *rsv
< reservation window node to add >
Output :void
Return :void
Description :insert a window to the block reservation rb tree
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
void me2fsInsertReserveWindow( struct super_block *sb,
struct ext2_reserve_window_node *rsv );
/*
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Function :me2fsDiscardReservation
Input :struct inode *inode
< vfs inode >
Output :void
Return :void
Description :free block reservation window on last file close, or truncate
or at last input()
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
*/
void me2fsDiscardReservation( struct inode *inode );
#endif // __ME2FS_BLOCK_H__