Struct DioAlign 

pub struct DioAlign {
    pub offset: usize,
    pub memory: usize,
}

Available on crate feature async only.

Fields

offset: usize

Alignment required for the file offset and the transfer length.

memory: usize

Alignment required for the buffer address. Invariant: no less than MIN_MEM_ALIGN.

Implementations

impl DioAlign

pub fn span(&self, offset: u64, len: usize) -> (u64, u64, usize)

Round offset down and end up to the offset alignment.

Returns (lo, hi, pad) where pad is how far into the aligned span the caller’s data begins. Note hi is deliberately not clamped to the file size: the length must stay aligned, so a read at EOF is expected to come up short and the caller must handle the tail.

pub fn probe(file: &File) -> Option<Self>

Available on Linux only.

Query the alignment O_DIRECT requires for this file.

None means direct I/O is not supported here and the caller should use buffered reads.

Trait Implementations

impl Clone for DioAlign

fn clone(&self) -> DioAlign

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for DioAlign

impl Debug for DioAlign

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

Formats the value using the given formatter.