Struct ExtensibleArraySuperBlock 

pub struct ExtensibleArraySuperBlock {
    pub class_id: u8,
    pub header_addr: u64,
    pub block_offset: u64,
    pub dblk_addrs: Vec<u64>,
    pub page_init: Vec<u8>,
}

Extensible array super block (EASB).

Holds the data-block addresses for one super block. Used for super blocks whose data-block addresses do not fit in the index block. Paged data blocks (very large arrays) are not supported.

On-disk layout:

"EASB"(4) + version(1) + class_id(1)
+ header_addr(sizeof_addr)
+ block_offset(arr_off_size)
+ [page-init bitmaps: ndblks * dblk_page_init_size — only if data blocks paged]
+ data_block_addresses(ndblks * sizeof_addr)
+ checksum(4)

Fields

class_id: u8

header_addr: u64

block_offset: u64

dblk_addrs: Vec<u64>

page_init: Vec<u8>

Page-init bitmaps (ndblks * dblk_page_init_size bytes); empty when the super block’s data blocks are not paged.

Implementations

impl ExtensibleArraySuperBlock

pub fn new( class_id: u8, header_addr: u64, block_offset: u64, ndblks: usize, ) -> Self

Create an empty (non-paged) super block with ndblks undefined slots.

pub fn encode(&self, ctx: &FormatContext, max_nelmts_bits: u8) -> Vec<u8>

pub fn decode( buf: &[u8], ctx: &FormatContext, max_nelmts_bits: u8, ndblks: usize, page_init_total: usize, ) -> FormatResult<Self>

Decode a super block. page_init_total is the total size of the page-init bitmap region (ndblks * dblk_page_init_size); pass 0 when the super block’s data blocks are not paged.

Trait Implementations

impl Clone for ExtensibleArraySuperBlock

fn clone(&self) -> ExtensibleArraySuperBlock

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExtensibleArraySuperBlock

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

Formats the value using the given formatter.

impl PartialEq for ExtensibleArraySuperBlock

fn eq(&self, other: &ExtensibleArraySuperBlock) -> 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 ExtensibleArraySuperBlock