Struct DevItem

#[repr(C, packed(1))]
pub struct DevItem {

    pub devid: U64<LE>,
    pub total_bytes: U64<LE>,
    pub bytes_used: U64<LE>,
    pub io_align: U32<LE>,
    pub io_width: U32<LE>,
    pub sector_size: U32<LE>,
    pub type: U64<LE>,
    pub generation: U64<LE>,
    pub start_offset: U64<LE>,
    pub dev_group: U32<LE>,
    pub seek_speed: u8,
    pub bandwith: u8,
    pub uuid: UuidBytes,
    pub fsid: UuidBytes,
}

Represents a complete block device.

Fields

devid: U64<LE>

The internal btrfs device ID.

This should match the devid found in the filesystem’s list of devices.

total_bytes: U64<LE>

The size of the device.

bytes_used: U64<LE>

The bytes in use by the filesystem on the device.

io_align: U32<LE>

The optimal I/O alignment for this device.

io_width: U32<LE>

The optimal I/O width for this device.

sector_size: U32<LE>

The minimum I/O size for this device.

type: U64<LE>

The type and info for this device.

generation: U64<LE>

The expected generation for this device.

start_offset: U64<LE>

The starting byte of this partition on the device, to allow for stripe alignment.

dev_group: U32<LE>

Grouping information for allocation decisions.

seek_speed: u8

The seek speed of the device on a scale from 0 to 100, where 100 is the fastest.

bandwith: u8

The bandwidth of the device on a scale from 0 to 100, where 100 is the fastest.

uuid: UuidBytes

The generated UUID for this device.

fsid: UuidBytes

The UUID of the filesystem that owns this device.

Trait Implementations

impl AsBytes for DevItem

where U64<LE>: AsBytes, U32<LE>: AsBytes, u8: AsBytes, UuidBytes: AsBytes,

fn as_bytes(&self) -> &[u8]

Gets the bytes of this value.

fn as_bytes_mut(&mut self) -> &mut [u8]

where Self: FromBytes,

Gets the bytes of this value mutably.

fn write_to<B>(&self, bytes: B) -> Option<()>

where B: ByteSliceMut,

Writes a copy of self to bytes.

fn write_to_prefix<B>(&self, bytes: B) -> Option<()>

where B: ByteSliceMut,

Writes a copy of self to the prefix of bytes.

fn write_to_suffix<B>(&self, bytes: B) -> Option<()>

where B: ByteSliceMut,

Writes a copy of self to the suffix of bytes.

impl Clone for DevItem

fn clone(&self) -> DevItem

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DevItem

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

Formats the value using the given formatter.

impl FromBytes for DevItem

where U64<LE>: FromBytes, U32<LE>: FromBytes, u8: FromBytes, UuidBytes: FromBytes,

fn read_from<B>(bytes: B) -> Option<Self>

where B: ByteSlice, Self: Sized,

Reads a copy of Self from bytes.

fn read_from_prefix<B>(bytes: B) -> Option<Self>

where B: ByteSlice, Self: Sized,

Reads a copy of Self from the prefix of bytes.

fn read_from_suffix<B>(bytes: B) -> Option<Self>

where B: ByteSlice, Self: Sized,

Reads a copy of Self from the suffix of bytes.

fn new_zeroed() -> Self

where Self: Sized,

Creates an instance of Self from zeroed bytes.

impl Copy for DevItem

impl Unaligned for DevItem