Struct devicemapper::DmOptions

pub struct DmOptions { /* fields omitted */ }

Encapsulates options for device mapper calls

Implementations

impl DmOptions

pub fn new() -> DmOptions

Create a new empty option

pub fn set_flags(&mut self, flags: DmFlags) -> &mut DmOptions

Set the DmFlags value for option. Note this call is not additive in that it sets (replaces) entire flag value in one call. Thus if you want to incrementally add additional flags you need to retrieve current and ‘|’ with new.

use devicemapper::DmFlags;
use devicemapper::DmOptions;

let mut options = DmOptions::new();
options.set_flags(DmFlags::DM_READONLY);
let flags = DmFlags::DM_PERSISTENT_DEV | options.flags();
options.set_flags(flags);

pub fn set_cookie(&mut self, cookie: DmCookie) -> &mut DmOptions

Set the cookie bitfield value for option (overloaded meaning with event_nr in header). Note this call is not additive in that it sets (replaces) entire cookie value in one call. Thus if you want to incrementally add additional flags you need to retrieve current and ‘|’ with new.

use devicemapper::{DmCookie, DmFlags};
use devicemapper::DmOptions;

let mut options = DmOptions::new();
options.set_cookie(DmCookie::DM_UDEV_PRIMARY_SOURCE_FLAG);

let new_cookie = options.cookie() | DmCookie::DM_UDEV_DISABLE_DM_RULES_FLAG;
options.set_cookie(new_cookie);

pub fn flags(&self) -> DmFlags

Retrieve the flags value

pub fn cookie(&self) -> DmCookie

Retrieve the cookie value (used for input in upper 16 bits of event_nr header field).

Trait Implementations

impl Clone for DmOptions

fn clone(&self) -> DmOptions

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for DmOptions

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

Formats the value using the given formatter.

impl Default for DmOptions

fn default() -> DmOptions

Returns the “default value” for a type.