Enum InlineRef 

pub enum InlineRef {
    TreeBlockBackref {
        ref_offset: u64,
        root: u64,
    },
    SharedBlockBackref {
        ref_offset: u64,
        parent: u64,
    },
    ExtentDataBackref {
        ref_offset: u64,
        root: u64,
        objectid: u64,
        offset: u64,
        count: u32,
    },
    SharedDataBackref {
        ref_offset: u64,
        parent: u64,
        count: u32,
    },
    ExtentOwnerRef {
        ref_offset: u64,
        root: u64,
    },
}

Inline reference types found inside EXTENT_ITEM/METADATA_ITEM.

Variants

TreeBlockBackref

Direct backref from a metadata extent to the tree that owns it. The root field is the tree objectid (e.g. 5 for FS_TREE).

Fields

ref_offset: u64

Raw offset value from the inline ref header (equals root).

root: u64

Tree objectid that owns this metadata block.

SharedBlockBackref

Shared backref from a metadata extent via a parent tree block. Used when a tree block is shared between snapshots.

Fields

ref_offset: u64

Raw offset value from the inline ref header (equals parent).

parent: u64

Logical bytenr of the parent tree block that references this extent.

ExtentDataBackref

Backref from a data extent to a specific file inode. Stores the owning root, inode number, file offset, and reference count.

Fields

ref_offset: u64

Computed hash of (root, objectid, offset) for display.

root: u64

Tree objectid that owns the referencing inode.

objectid: u64

Inode number that references this data extent.

offset: u64

File byte offset where this extent is referenced.

count: u32

Number of references from this (root, objectid, offset) triple.

SharedDataBackref

Shared backref from a data extent via a parent tree block. Used when data extents are shared between snapshots.

Fields

ref_offset: u64

Raw offset value from the inline ref header (equals parent).

parent: u64

Logical bytenr of the parent tree block that references this extent.

count: u32

Number of references from the parent block.

ExtentOwnerRef

Simple ownership reference for an extent (simple_quota feature). Records which tree root owns the extent.

Fields

ref_offset: u64

Raw offset value from the inline ref header (equals root).

root: u64

Tree objectid that owns this extent.

Implementations

impl InlineRef

pub fn raw_type(&self) -> u8

The raw type byte for this inline ref.

pub fn raw_offset(&self) -> u64

The offset value from the inline ref header.

Trait Implementations

impl Clone for InlineRef

fn clone(&self) -> InlineRef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for InlineRef

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

Formats the value using the given formatter.