Struct DeviceItem 

pub struct DeviceItem {

    pub devid: u64,
    pub total_bytes: u64,
    pub bytes_used: u64,
    pub io_align: u32,
    pub io_width: u32,
    pub sector_size: u32,
    pub dev_type: u64,
    pub generation: u64,
    pub start_offset: u64,
    pub dev_group: u32,
    pub seek_speed: u8,
    pub bandwidth: u8,
    pub uuid: Uuid,
    pub fsid: Uuid,
}

Device item describing a single device in the filesystem.

Stored in the device tree and embedded in the superblock. Contains the device’s size, usage, and identifying UUIDs.

Fields

devid: u64

Unique device ID within this filesystem.

total_bytes: u64

Total size of the device in bytes.

bytes_used: u64

Bytes allocated on this device.

io_align: u32

I/O alignment requirement.

io_width: u32

I/O width requirement.

sector_size: u32

Sector size of this device.

dev_type: u64

Device type (reserved, always 0).

generation: u64

Generation when this device was last updated.

start_offset: u64

Start offset for allocations on this device.

dev_group: u32

Device group (reserved, always 0).

seek_speed: u8

Seek speed hint (0 = not set).

bandwidth: u8

Bandwidth hint (0 = not set).

uuid: Uuid

UUID of this device.

fsid: Uuid

Filesystem UUID that this device belongs to.

Implementations

impl DeviceItem

pub fn write_bytes(&self, buf: &mut impl BufMut)

Serialize this device item to a BufMut in on-disk little-endian format.

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

Parse a device item from a raw byte buffer.

Trait Implementations

impl Clone for DeviceItem

fn clone(&self) -> DeviceItem

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DeviceItem

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

Formats the value using the given formatter.