Struct SuperBlock 

#[repr(C)]
pub struct SuperBlock {
    pub magic: [u8; 8],
    pub block_count: u64,
    pub block_count_inused: u64,
    pub inode_count: u64,
    pub inode_count_inused: u64,
    pub has_journal: u64,
    pub _pad: [u8; 4048],
}

On-disk representation of the superblock of the Fast File System (FFS).

The superblock contains essential metadata about the filesystem, including the total number of blocks and inodes, as well as the size of the journal.

Fields

magic: [u8; 8]

File system magic: “KeOSFFS\0”.

block_count: u64

Total number of blocks in the filesystem.

block_count_inused: u64

In-used count of blocks in the filesystem.

inode_count: u64

Total number of inodes in the filesystem.

inode_count_inused: u64

In-used count of inodes in the filesystem.

has_journal: u64

A indicator that this filesystem have journaling feature.

_pad: [u8; 4048]

Padding to align to Block size.

Implementations

impl SuperBlock

pub fn from_disk(disk: &Disk) -> Result<BlockPointsTo<Self>, KernelError>

Loads the superblock structure from disk.

This function reads the first 8 sectors (4096 bytes) from the disk. It is the first step when mounting a file system, as the superblock contains metadata such as layout information, and journals.

Parameters

• disk: A reference to the block device implementing the Disk trait.

Returns

• Ok(Box<SuperBlock>): If the superblock is successfully read.
• Err(KernelError): If any sector read fails.

Trait Implementations

impl Clone for SuperBlock

fn clone(&self) -> SuperBlock

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SuperBlock

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for SuperBlock

fn default() -> Self

Returns the “default value” for a type.

impl MetaData for SuperBlock

fn load( _ffs: &FastFileSystemInner, _lba: LogicalBlockAddress, ) -> Result<BlockPointsTo<Self>, KernelError>

Loads a metadata structure from disk at the specified logical block address.

impl Copy for SuperBlock