Struct devicemapper::CacheDev

pub struct CacheDev { /* private fields */ }

DM Cache device

Implementations

impl CacheDev

Cache device implementation.

pub fn new( dm: &DM, name: &DmName, uuid: Option<&DmUuid>, meta: LinearDev, cache: LinearDev, origin: LinearDev, cache_block_size: Sectors ) -> DmResult<CacheDev>

Construct a new CacheDev with the given data and meta devs. Returns an error if the device is already known to the kernel.

pub fn setup( dm: &DM, name: &DmName, uuid: Option<&DmUuid>, meta: LinearDev, cache: LinearDev, origin: LinearDev, cache_block_size: Sectors ) -> DmResult<CacheDev>

Set up a cache device from the given metadata and data devices.

pub fn set_origin_table( &mut self, dm: &DM, table: Vec<TargetLine<LinearDevTargetParams>> ) -> DmResult<()>

Set the table for the existing origin device. This action puts the device in a state where it is ready to be resumed. Warning: It is the client’s responsibility to make sure the designated table is compatible with the device’s existing table. If not, this function will still succeed, but some kind of data corruption will be the inevitable result.

pub fn set_cache_table( &mut self, dm: &DM, table: Vec<TargetLine<LinearDevTargetParams>> ) -> DmResult<()>

Set the table for the existing cache sub-device. This action puts the device in a state where it is ready to be resumed. Warning: It is the client’s responsibility to make sure the designated table is compatible with the device’s existing table. If not, this function will still succeed, but some kind of data corruption will be the inevitable result.

pub fn set_meta_table( &mut self, dm: &DM, table: Vec<TargetLine<LinearDevTargetParams>> ) -> DmResult<()>

Set the table for the existing meta sub-device. This action puts the device in a state where it is ready to be resumed. Warning: It is the client’s responsibility to make sure the designated table is compatible with the device’s existing table. If not, this function will still succeed, but some kind of data corruption will be the inevitable result.

pub fn status(&self, dm: &DM, options: DmOptions) -> DmResult<CacheDevStatus>

Get the current status of the cache device.

Trait Implementations

impl Debug for CacheDev

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

Formats the value using the given formatter.

impl DmDevice<CacheDevTargetTable> for CacheDev

fn device(&self) -> Device

The device.

fn devnode(&self) -> PathBuf

The device’s device node.

fn equivalent_tables( left: &CacheDevTargetTable, right: &CacheDevTargetTable ) -> DmResult<bool>

Check if tables indicate an equivalent device.

fn name(&self) -> &DmName

The device’s name.

fn size(&self) -> Sectors

The number of sectors available for user data.

fn table(&self) -> &CacheDevTargetTable

What the device thinks its table is.

fn teardown(&mut self, dm: &DM) -> DmResult<()>

Erase the kernel’s memory of this device.

fn uuid(&self) -> Option<&DmUuid>

The device’s UUID, if available. Note that the UUID is not any standard UUID format.

fn read_kernel_table(dm: &DM, id: &DevId<'_>) -> DmResult<T>

Read the devicemapper table

fn resume(&mut self, dm: &DM) -> DmResult<()>

Resume I/O on the device.

fn suspend(&mut self, dm: &DM, options: DmOptions) -> DmResult<()>

Suspend I/O on the device.

fn table_load(&self, dm: &DM, table: &T, options: DmOptions) -> DmResult<()>

Load a table