Struct AllocationMap 

pub struct AllocationMap { /* private fields */ }

Tracks which sectors are allocated in an image.

Uses a bitmap to efficiently track sector usage, supporting allocation and deallocation operations.

Implementations

impl AllocationMap

pub fn new(total_sectors: u32) -> Self

Creates a new allocation map for the given number of sectors.

pub fn from_existing( used_extents: &[Extent], total_sectors: u32, sector_size: u32, ) -> Self

Creates an allocation map from a list of existing used extents.

pub fn allocate(&mut self, size_bytes: u64, sector_size: u32) -> Option<Extent>

Allocates a contiguous region of the given size.

Returns None if there isn’t enough contiguous free space.

pub fn mark_used(&mut self, extent: Extent, sector_size: u32)

Marks the given extent as used.

pub fn mark_free(&mut self, extent: Extent, sector_size: u32)

Marks the given extent as free.

pub fn is_free(&self, sector: u32) -> bool

Checks if a sector is free.

pub fn is_used(&self, sector: u32) -> bool

Checks if a sector is used.

pub fn total_sectors(&self) -> u32

Returns the total number of sectors.

pub fn free_sectors(&self) -> u32

Returns the number of free sectors.

pub fn used_sectors(&self) -> u32

Returns the number of used sectors.

pub fn reserve_initial(&mut self, sectors: u32, sector_size: u32)

Reserves the first N sectors (typically for metadata).

Trait Implementations

impl Clone for AllocationMap

fn clone(&self) -> AllocationMap

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AllocationMap

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

Formats the value using the given formatter.