Struct FormatOptions 

pub struct FormatOptions {
    pub block_size: u32,
    pub size: u64,
    pub uuid: Option<Uuid>,
    pub label: Option<String>,
}

Parameters for creating a new ext4 image.

Construct via FormatOptions::new and layer on uuid / label as needed. The resulting options are passed to Formatter::with_options.

Fields

block_size: u32

Block size in bytes. Only 4096 is currently accepted; the field is explicit so future versions can widen the accepted set without another API break.

size: u64

Total size of the image file in bytes.

uuid: Option<Uuid>

UUID written to the superblock. None picks a random v4 UUID at format time.

label: Option<String>

Volume label. Must be ≤ 16 bytes UTF-8 and contain no NUL bytes. None leaves the field zeroed.

Implementations

impl FormatOptions

pub fn new(size: u64) -> Self

Create options for an image of the given size, with default block_size = 4096, random UUID, no label.

pub fn uuid(self, uuid: Uuid) -> Self

Set an explicit UUID instead of a randomly generated one.

pub fn label(self, label: impl Into<String>) -> Self

Set the volume label.

Trait Implementations

impl Clone for FormatOptions

fn clone(&self) -> FormatOptions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FormatOptions

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

Formats the value using the given formatter.