Struct Ext2Superblock 

#[repr(C, packed(1))]
pub struct Ext2Superblock {

    pub inodes_count: u32,
    pub blocks_count: u32,
    pub r_blocks_count: u32,
    pub free_blocks_count: u32,
    pub free_inodes_count: u32,
    pub first_data_block: u32,
    pub log_block_size: u32,
    pub log_frag_size: u32,
    pub blocks_per_group: u32,
    pub frags_per_group: u32,
    pub inodes_per_group: u32,
    pub mtime: u32,
    pub wtime: u32,
    pub mnt_count: u16,
    pub max_mnt_count: u16,
    pub magic: u16,
    pub state: u16,
    pub errors: u16,
    pub minor_rev_level: u16,
    pub lastcheck: u32,
    pub checkinterval: u32,
    pub creator_os: u32,
    pub rev_level: u32,
    pub def_resuid: u16,
    pub def_resgid: u16,
    pub first_ino: u32,
    pub inode_size: u16,
    pub block_group_nr: u16,
    pub feature_compat: u32,
    pub feature_incompat: u32,
    pub feature_ro_compat: u32,
    pub uuid: [u8; 16],
    pub volume_name: [u8; 16],
    pub last_mounted: [u8; 64],
    pub algorithm_usage_bitmap: u32,
    pub prealloc_blocks: u8,
    pub prealloc_dir_blocks: u8,
    pub padding: [u8; 820],
}

ext2 Superblock structure

This structure represents the superblock of an ext2 filesystem. It contains essential information about the filesystem layout and parameters.

Fields

inodes_count: u32

Total number of inodes

blocks_count: u32

Total number of blocks

r_blocks_count: u32

Number of blocks reserved for superuser

free_blocks_count: u32

Number of free blocks

free_inodes_count: u32

Number of free inodes

first_data_block: u32

First data block (0 for 1K blocks, 1 for larger blocks)

log_block_size: u32

Block size (log2(block_size) - 10)

log_frag_size: u32

Fragment size (log2(fragment_size) - 10)

blocks_per_group: u32

Number of blocks per group

frags_per_group: u32

Number of fragments per group

inodes_per_group: u32

Number of inodes per group

mtime: u32

Mount time

wtime: u32

Write time

mnt_count: u16

Mount count

max_mnt_count: u16

Maximum mount count

magic: u16

Magic signature

state: u16

File system state

errors: u16

Behavior when detecting errors

minor_rev_level: u16

Minor revision level

lastcheck: u32

Time of last check

checkinterval: u32

Maximum time between checks

creator_os: u32

Creator OS

rev_level: u32

Revision level

def_resuid: u16

Default uid for reserved blocks

def_resgid: u16

Default gid for reserved blocks

first_ino: u32

First non-reserved inode

inode_size: u16

Size of inode structure

block_group_nr: u16

Block group this superblock is part of

feature_compat: u32

Compatible feature set

feature_incompat: u32

Incompatible feature set

feature_ro_compat: u32

Read-only feature set

uuid: [u8; 16]

128-bit UUID for volume

volume_name: [u8; 16]

Volume name

last_mounted: [u8; 64]

Directory where last mounted

algorithm_usage_bitmap: u32

Algorithm usage bitmap

prealloc_blocks: u8

Number of blocks to try to preallocate for files

prealloc_dir_blocks: u8

Number of blocks to preallocate for directories

padding: [u8; 820]

Padding to 1024 bytes

Implementations

impl Ext2Superblock

pub fn from_bytes(data: &[u8]) -> Result<Self, FileSystemError>

Parse superblock from raw bytes using unsafe type conversion for efficiency

pub fn from_bytes_boxed(data: &[u8]) -> Result<Box<Self>, FileSystemError>

Parse superblock from raw bytes and return as Box to avoid stack overflow

pub fn get_block_size(&self) -> u32

Get block size in bytes

pub fn get_blocks_count(&self) -> u32

Get total blocks count

pub fn get_inodes_count(&self) -> u32

Get total inodes count

pub fn get_blocks_per_group(&self) -> u32

Get blocks per group

pub fn get_inodes_per_group(&self) -> u32

Get inodes per group

pub fn get_inode_size(&self) -> u16

Get inode size

pub fn get_first_data_block(&self) -> u32

Get first data block

Trait Implementations

impl Clone for Ext2Superblock

fn clone(&self) -> Ext2Superblock

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Ext2Superblock

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

Formats the value using the given formatter.

impl Copy for Ext2Superblock