Struct AttributeId 

#[repr(transparent)]
pub struct AttributeId(pub u64);

Tuple Fields

0: u64

Implementations

impl AttributeId

pub const DATA: Self

The common case for extents which cover the data payload of an object.

pub const BLOB_METADATA: Self

Contains a serialized and versioned BlobMetadata struct. Use [BlobMetadata::read_from] and [BlobMetadata::write_to] to access this attribute.

pub const BLOB_MERKLE: Self

Contains a serialized BlobMetadataUnversioned struct. This attribute may still exist on blobs but should no longer be written. Use AttributeId::BLOB_METADATA instead.

pub const FSVERITY_MERKLE: Self

For fsverity files in Fxfs, we store the merkle tree of the verified file at a well-known attribute.

pub const XATTR_RANGE_START: Self

The range of fxfs attribute IDs which are reserved for extended attribute values. Whenever a new attribute is needed, the first unused ID will be chosen from this range. It’s technically safe to change these values, but it has potential consequences - they are only used during ID selection, so any existing extended attributes keep their IDs, which means any past or present selected range here could potentially have used attributes unless they are explicitly migrated, which isn’t currently done.

pub const XATTR_RANGE_END: Self

pub const SORTED_START: Self

A semantic alias for the 0 attribute ID, indicating that it is being used as a starting point to iterate over all attributes rather than specifically looking up the primary data attribute AttributeId::DATA.

pub const fn raw(self) -> u64

pub const fn next(self) -> Self

Returns the current id + 1.

pub const fn is_xattr(self) -> bool

Returns true if the attribute ID is within the range of extended attributes.

Trait Implementations

impl Clone for AttributeId

fn clone(&self) -> AttributeId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AttributeId

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for AttributeId

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for AttributeId

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

Formats the value using the given formatter.

impl Hash for AttributeId

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 Ord for AttributeId

fn cmp(&self, other: &AttributeId) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for AttributeId

fn eq(&self, other: &AttributeId) -> 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 PartialOrd for AttributeId

fn partial_cmp(&self, other: &AttributeId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for AttributeId

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl SerializeKey for AttributeId

fn serialize_key_to<B: Buffer>(&self, serializer: &mut KeySerializer<'_, B>)

Encodes key representation sequentially into serialization stream.

fn deserialize_key_from(deserializer: &mut KeyDeserializer<'_>) -> Result<Self>

Decodes serializations sequentially from underlying raw bytes.

impl ToValue for AttributeId

fn to_value(&self) -> Value<'_>

Perform the conversion.

impl TypeFingerprint for AttributeId

fn fingerprint() -> String

impl Copy for AttributeId

impl Eq for AttributeId

impl StructuralPartialEq for AttributeId