Enum MetadataOp 

#[repr(u8)]
pub enum MetadataOp {
    Stat = 0,
    ReadLink = 1,
    MkDir = 2,
    RmDir = 3,
    Unlink = 4,
    HardLink = 5,
    Symlink = 6,
    Chmod = 7,
    OpenCreate = 8,
}

Which metadata syscall is being measured.

Separate ops feed independent controllers because their service-time distributions differ — stat (pure lookup) and unlink (mutation plus parent-directory write) hit different code paths on the metadata server and converge on very different baselines. Mixing them in one controller pollutes the per-op latency signal: the resulting ratio drifts with operation-mix changes that have nothing to do with congestion (the long-window baseline percentile shifts as the mix changes, and in cross mode the inter-quantile spread becomes a function of the mix rather than the load).

The variants are ordered so they index a fixed-size array when paired with a Side; see N_META_OPS.

Variants

Stat = 0

stat / lstat / symlink_metadata. Also covers canonicalize and read-only File::open — both are dominated by lookup work on the metadata path.

ReadLink = 1

readlink. Distinct from Stat because it pulls the symlink’s target body, not just the inode header.

MkDir = 2

mkdir / create_dir. Allocates a directory inode and wires it into the parent.

RmDir = 3

rmdir / remove_dir. Verifies emptiness then removes the dir.

Unlink = 4

unlink / remove_file. Decrements link count, frees inode at zero.

HardLink = 5

link / hard_link. Bumps an existing inode’s link count.

Symlink = 6

symlink (creation). Allocates an inode whose body is the target path.

Chmod = 7

Permission / ownership / timestamp updates: chmod / set_permissions, chown / fchownat, utimes / utimensat. Bucketed together because they’re all single inode writes.

OpenCreate = 8

open(O_CREAT) / File::create. Allocates a regular-file inode and wires it into the parent.

Implementations

impl MetadataOp

pub const ALL: [MetadataOp; 9]

All op variants, in discriminant order. Useful when wiring up a controller for every op kind without having to spell out each.

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

Short identifier suitable for the progress-bar label and tracing unit field. Kept as kebab-case so it composes cleanly with side prefixes (src-stat, dst-mkdir, etc.).

Trait Implementations

impl Clone for MetadataOp

fn clone(&self) -> MetadataOp

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MetadataOp

impl Debug for MetadataOp

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

Formats the value using the given formatter.

impl Eq for MetadataOp

impl Hash for MetadataOp

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

where __H: Hasher,

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 MetadataOp

fn eq(&self, other: &MetadataOp) -> 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 StructuralPartialEq for MetadataOp