Enum JournalBackendKind 

#[non_exhaustive]
pub enum JournalBackendKind {
    KernelIoUring,
    KernelDirect,
    KernelBuffered,
    Spdk,
}

Concrete backend identity reported via JournalBackend::backend_kind.

The enum is #[non_exhaustive] so adding new backend identities in a future minor release (PMEM, RDMA, etc.) is non-breaking.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

KernelIoUring

Kernel path with io_uring submission + completion (Linux Method::Direct + Method::Auto selection).

KernelDirect

Kernel path with O_DIRECT + synchronous pwrite + manual fdatasync (Linux without io_uring, macOS, Windows FILE_FLAG_NO_BUFFERING).

KernelBuffered

Kernel path with buffered IO + fdatasync / equivalent (the universal fallback; default mode of super::JournalHandle when no JournalOptions::direct(true) is set).

Spdk

SPDK kernel-bypass backend — Linux + fsys-spdk feature. Not selectable in 1.1.0 (the implementation lives in a companion crate that is in scaffold state); reserved here so consumers can pattern-match against it today.

Implementations

impl JournalBackendKind

pub const fn as_str(self) -> &'static str

Returns the canonical lowercase name for the backend. Used in selection-reason strings on JournalBackendInfo and in the observability accessor on super::JournalHandle.

pub const fn is_kernel(self) -> bool

Returns true when the backend is a kernel-path backend (anything except JournalBackendKind::Spdk).

Trait Implementations

impl Clone for JournalBackendKind

fn clone(&self) -> JournalBackendKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for JournalBackendKind

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

Formats the value using the given formatter.

impl Display for JournalBackendKind

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

Formats the value using the given formatter.

impl Hash for JournalBackendKind

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for JournalBackendKind

fn eq(&self, other: &JournalBackendKind) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for JournalBackendKind

impl Eq for JournalBackendKind

impl StructuralPartialEq for JournalBackendKind