superblock.h File Reference

Contains superblock struct and its methods. More...

#include <stdint.h>
#include <stdbool.h>

Go to the source code of this file.

Functions
struct	__attribute__ ((__packed__)) fs_info
	Contains main information about FS. More...
size_t	sizeof_superblock (const struct superblock *superblock)
void	init_super_block (struct superblock *superblock)
	Constructor of superblock. More...
void	destroy_super_block (struct superblock *superblock)
	Destructor of superblock. More...
ssize_t	read_super_block (int fd, struct superblock *superblock)
	Read sb from memory. More...
ssize_t	write_super_block (int fd, struct superblock *superblock)
	Write sb to memory. More...
uint16_t	reserve_inode (const struct superblock *superblock)
	Reserve free inode. More...
uint16_t	free_inode (const struct superblock *superblock, uint16_t inode_id)
	Release inode. More...
uint16_t	reserve_block (const struct superblock *superblock)
	Reserve block. More...
uint16_t	free_block (const struct superblock *superblock, uint16_t block_id)
	Release block. More...

Detailed Description

Contains superblock struct and its methods.

Author

yaishenka

Date

13.03.2021

Definition in file superblock.h.

Function Documentation

struct __attribute__

(

(__packed__)

)

Contains main information about FS.

Main suberblock struct Contains fs_info and masks for blocks and inodes.

Definition at line 16 of file superblock.h.

void destroy_super_block

(

struct superblock *

superblock

)

Destructor of superblock.

Parameters

superblock

Definition at line 41 of file superblock.c.

uint16_t free_block	(	const struct superblock *	superblock,
		uint16_t	block_id
	)

Release block.

Parameters

superblock
block_id	id of block to release

Returns

id of block if all ok; -1 if block was already released

Definition at line 149 of file superblock.c.

uint16_t free_inode	(	const struct superblock *	superblock,
		uint16_t	inode_id
	)

Release inode.

Parameters

superblock
inode_id	id of inode to release

Returns

id of inode if all ok; superblock->fs_info->blocks_count_in_inode if inode was already released

Definition at line 128 of file superblock.c.

void init_super_block

(

struct superblock *

superblock

)

Constructor of superblock.

Construct superblock with default params defined in core/defines.h

Parameters

superblock

Definition at line 29 of file superblock.c.

ssize_t read_super_block	(	int	fd,
		struct superblock *	superblock
	)

Read sb from memory.

Parameters

fd	opened fd
superblock	empty instance of superblock

Returns

sizeof(superblock) if reading is ok; -1 otherwise and destruct superblock object

Warning

printf strerror(errno) to stderr

Definition at line 47 of file superblock.c.

uint16_t reserve_block

(

const struct superblock *

superblock

)

Reserve block.

Parameters

superblock

Returns

block_id if all ok; superblock->fs_info->blocks_count_in_inode if all block are reserved

Definition at line 138 of file superblock.c.

uint16_t reserve_inode

(

const struct superblock *

superblock

)

Reserve free inode.

Parameters

superblock

Returns

Id of first free inode if it exists; superblock->fs_info->inodes_count if all inodes are reserved

Definition at line 117 of file superblock.c.

size_t sizeof_superblock

(

const struct superblock *

superblock

)

Count blocks_count_in_inode of inode in bytes

Parameters

superblock

Returns

blocks_count_in_inode of superblock in FS

Definition at line 23 of file superblock.c.

ssize_t write_super_block	(	int	fd,
		struct superblock *	superblock
	)

Write sb to memory.

Parameters

fd	opened fd
superblock

Returns

sizeof(superblock) if writing is ok; -1 otherwise

Warning

printf strerror(errno) to stderr

Definition at line 85 of file superblock.c.