Struct ChunkItem 

pub struct ChunkItem {
    pub length: u64,
    pub owner: u64,
    pub stripe_len: u64,
    pub chunk_type: BlockGroupFlags,
    pub io_align: u32,
    pub io_width: u32,
    pub sector_size: u32,
    pub num_stripes: u16,
    pub sub_stripes: u16,
    pub stripes: Vec<ChunkStripe>,
}

Chunk item mapping logical addresses to physical device locations.

Key: (FIRST_CHUNK_TREE, CHUNK_ITEM, logical_offset). Each chunk maps a contiguous range of logical addresses to one or more device stripes.

Fields

length: u64

Length of this chunk in bytes.

owner: u64

Owner of this chunk (always BTRFS_FIRST_CHUNK_TREE_OBJECTID).

stripe_len: u64

Stripe length for striped profiles.

chunk_type: BlockGroupFlags

Type and RAID profile flags.

io_align: u32

I/O alignment requirement.

io_width: u32

I/O width requirement.

sector_size: u32

Sector size of the underlying devices.

num_stripes: u16

Number of stripes (device copies) for this chunk.

sub_stripes: u16

Number of sub-stripes (for RAID10).

stripes: Vec<ChunkStripe>

Physical device locations for each stripe.

Implementations

impl ChunkItem

pub fn parse(data: &[u8]) -> Option<Self>

Parse a chunk item (with stripes) from a raw byte buffer.

impl ChunkItem

pub fn to_mapping(&self, logical: u64) -> ChunkMapping

Convert to a ChunkMapping for use with chunk_item_bytes and ChunkTreeCache.

Trait Implementations

impl Clone for ChunkItem

fn clone(&self) -> ChunkItem

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChunkItem

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

Formats the value using the given formatter.