Struct FsSlack 

pub struct FsSlack {
    pub measured_permille: Option<u64>,
    pub slack_permille: u64,
}

The filesystem’s slack as this data set’s ledger reserves it.

Fields

measured_permille: Option<u64>

What a growing spool-sized file occupied beyond its bytes, ‰ of them, at worst — None when it could not be measured.

slack_permille: u64

What the ledger reserves on top of every copy, ‰: the measurement and SLACK_MARGIN_PERMILLE, never under PUSH_FS_SLACK_PERMILLE; UNMEASURED_SLACK_PERMILLE unmeasured.

Implementations

impl FsSlack

pub fn from_measured(measured_permille: Option<u64>) -> FsSlack

The slack from a measurement (None: not measured).

pub fn of(root: &Path) -> (FsSlack, Option<String>)

Measure root’s filesystem (measure_fs_slack) and say why when it cannot be.

pub fn reserve_permille(&self, copies: u64) -> u64

What one wire byte of a transfer of copies copies is promised, ‰.

pub fn words(&self, root: &Path, unmeasured_because: Option<&str>) -> String

The start-up line, in plain words: what the filesystem was measured to preallocate and what every push therefore reserves.

Trait Implementations

impl Clone for FsSlack

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FsSlack

impl Debug for FsSlack

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

Formats the value using the given formatter.

impl Default for FsSlack

fn default() -> Self

The floor: what a ledger built without a measurement reserves (a test’s, a tool’s).

impl Eq for FsSlack

impl PartialEq for FsSlack

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FsSlack