Struct ext2::superblock::SuperBlock

#[repr(C)]
pub(crate) struct SuperBlock {

    pub inodes_count: u32,
    pub blocks_count: u32,
    _r_blocks_count: u32,
    pub free_blocks_count: u32,
    pub free_inodes_count: u32,
    _first_data_block: u32,
    _log_block_size: u32,
    log_frag_size: u32,
    pub blocks_per_group: u32,
    frags_per_group: u32,
    pub inodes_per_group: u32,
    mtime: u32,
    wtime: u32,
    _mnt_count: u16,
    _max_mnt_count: u16,
    magic: u16,
    state: u16,
    errors: u16,
    _minor_rev_level: u16,
    _lastcheck: u32,
    _checkinterval: u32,
    _creator_os: u32,
    rev_level: u32,
    _def_resuid: u16,
    _def_resgid: u16,
    first_ino: u32,
    pub inode_size: u16,
    pub block_group_nr: u16,
    feature_compat: u32,
    feature_incompat: u32,
    _feature_ro_compat: u32,
    uuid: [u8; 16],
}

The ext2 superblock.

The field names are based on the specification. Note that this struct only holds the fields at the beginning of the superblock. All fields after the fields supported by this structure are filled with zeros.

Fields

inodes_count: u32

blocks_count: u32

_r_blocks_count: u32

free_blocks_count: u32

free_inodes_count: u32

_first_data_block: u32

_log_block_size: u32

log_frag_size: u32

blocks_per_group: u32

frags_per_group: u32

inodes_per_group: u32

mtime: u32

wtime: u32

_mnt_count: u16

_max_mnt_count: u16

magic: u16

state: u16

errors: u16

_minor_rev_level: u16

_lastcheck: u32

_checkinterval: u32

_creator_os: u32

rev_level: u32

_def_resuid: u16

_def_resgid: u16

first_ino: u32

inode_size: u16

block_group_nr: u16

feature_compat: u32

feature_incompat: u32

_feature_ro_compat: u32

uuid: [u8; 16]

Implementations

impl SuperBlock

pub fn new<'a>( arena: &'a Arena<'a>, cfg: &Builder, ) -> Result<&'a mut SuperBlock>

pub fn num_groups(&self) -> u16

Trait Implementations

impl Clone for SuperBlock

fn clone(&self) -> SuperBlock

Returns a copy 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() -> SuperBlock

Returns the “default value” for a type.

impl FromBytes for SuperBlock

where u32: FromBytes, u16: FromBytes, [u8; 16]: FromBytes,

fn ref_from_bytes( source: &[u8], ) -> Result<&Self, ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, Infallible>>

where Self: KnownLayout + Immutable,

Interprets the given source as a &Self.

fn ref_from_prefix( source: &[u8], ) -> Result<(&Self, &[u8]), ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, Infallible>>

where Self: KnownLayout + Immutable,

Interprets the prefix of the given source as a &Self without copying.

fn ref_from_suffix( source: &[u8], ) -> Result<(&[u8], &Self), ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, Infallible>>

where Self: Immutable + KnownLayout,

Interprets the suffix of the given bytes as a &Self.

fn mut_from_bytes( source: &mut [u8], ) -> Result<&mut Self, ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, Infallible>>

where Self: IntoBytes + KnownLayout,

Interprets the given source as a &mut Self.

fn mut_from_prefix( source: &mut [u8], ) -> Result<(&mut Self, &mut [u8]), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, Infallible>>

where Self: IntoBytes + KnownLayout,

Interprets the prefix of the given source as a &mut Self without copying.

fn mut_from_suffix( source: &mut [u8], ) -> Result<(&mut [u8], &mut Self), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, Infallible>>

where Self: IntoBytes + KnownLayout,

Interprets the suffix of the given source as a &mut Self without copying.

fn read_from_bytes(source: &[u8]) -> Result<Self, SizeError<&[u8], Self>>

where Self: Sized,

Reads a copy of Self from the given source.

fn read_from_prefix( source: &[u8], ) -> Result<(Self, &[u8]), SizeError<&[u8], Self>>

where Self: Sized,

Reads a copy of Self from the prefix of the given source.

fn read_from_suffix( source: &[u8], ) -> Result<(&[u8], Self), SizeError<&[u8], Self>>

where Self: Sized,

Reads a copy of Self from the suffix of the given source.

impl FromZeros for SuperBlock

where u32: FromZeros, u16: FromZeros, [u8; 16]: FromZeros,

fn zero(&mut self)

Overwrites self with zeros.

fn new_zeroed() -> Self

where Self: Sized,

Creates an instance of Self from zeroed bytes.

impl IntoBytes for SuperBlock

where u32: IntoBytes, u16: IntoBytes, [u8; 16]: IntoBytes, (): PaddingFree<Self, { _ }>,

fn as_bytes(&self) -> &[u8]

where Self: Immutable,

Gets the bytes of this value.

fn as_mut_bytes(&mut self) -> &mut [u8]

where Self: FromBytes,

Gets the bytes of this value mutably.

fn write_to(&self, dst: &mut [u8]) -> Result<(), SizeError<&Self, &mut [u8]>>

where Self: Immutable,

Writes a copy of self to dst.

fn write_to_prefix( &self, dst: &mut [u8], ) -> Result<(), SizeError<&Self, &mut [u8]>>

where Self: Immutable,

Writes a copy of self to the prefix of dst.

fn write_to_suffix( &self, dst: &mut [u8], ) -> Result<(), SizeError<&Self, &mut [u8]>>

where Self: Immutable,

Writes a copy of self to the suffix of dst.

impl KnownLayout for SuperBlock

where [u8; 16]: KnownLayout,

type PointerMetadata = <[u8; 16] as KnownLayout>::PointerMetadata

The type of metadata stored in a pointer to Self.

impl TryFromBytes for SuperBlock

where u32: TryFromBytes, u16: TryFromBytes, [u8; 16]: TryFromBytes,

fn try_ref_from_bytes( source: &[u8], ) -> Result<&Self, ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: KnownLayout + Immutable,

Attempts to interpret the given source as a &Self.

fn try_ref_from_prefix( source: &[u8], ) -> Result<(&Self, &[u8]), ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: KnownLayout + Immutable,

Attempts to interpret the prefix of the given source as a &Self.

fn try_ref_from_suffix( source: &[u8], ) -> Result<(&[u8], &Self), ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: KnownLayout + Immutable,

Attempts to interpret the suffix of the given source as a &Self.

fn try_mut_from_bytes( bytes: &mut [u8], ) -> Result<&mut Self, ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout,

Attempts to interpret the given source as a &mut Self without copying.

fn try_mut_from_prefix( source: &mut [u8], ) -> Result<(&mut Self, &mut [u8]), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout,

Attempts to interpret the prefix of the given source as a &mut Self.

fn try_mut_from_suffix( source: &mut [u8], ) -> Result<(&mut [u8], &mut Self), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout,

Attempts to interpret the suffix of the given source as a &mut Self.

fn try_read_from_bytes( source: &[u8], ) -> Result<Self, ConvertError<Infallible, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: Sized,

Attempts to read the given source as a Self.

fn try_read_from_prefix( source: &[u8], ) -> Result<(Self, &[u8]), ConvertError<Infallible, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: Sized,

Attempts to read a Self from the prefix of the given source.

fn try_read_from_suffix( source: &[u8], ) -> Result<(&[u8], Self), ConvertError<Infallible, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: Sized,

Attempts to read a Self from the suffix of the given source.

impl Copy for SuperBlock

impl Immutable for SuperBlock

where u32: Immutable, u16: Immutable, [u8; 16]: Immutable,