Enum WritePlan 

pub enum WritePlan {
    Plain(Vec<StripePlacement>),
    Parity(ParityPlan),
}

Result of ChunkTreeCache::plan_write.

Non-parity profiles (SINGLE / DUP / RAID1* / RAID0 / RAID10) produce a Plain plan: a flat list of placements, each a slice of the caller’s buffer to a (devid, physical) location. RAID5 and RAID6 produce a Parity plan: per-row descriptors that the executor must read into scratch buffers, mix with the caller’s bytes, compute parity over, then write data + parity slices to the device columns.

Variants

Plain(Vec<StripePlacement>)

SINGLE / DUP / RAID1* / RAID0 / RAID10 placements. The caller just iterates the vec and writes slices of its buffer.

Parity(ParityPlan)

RAID5 / RAID6 placements. The caller must run the parity executor: preread every data column slot of every touched row, overlay caller bytes, compute P (and Q for RAID6), then write the overlaid byte ranges and the parity slots.

Trait Implementations

impl Clone for WritePlan

fn clone(&self) -> WritePlan

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WritePlan

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

Formats the value using the given formatter.

impl PartialEq for WritePlan

fn eq(&self, other: &WritePlan) -> 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 Eq for WritePlan

impl StructuralPartialEq for WritePlan