DeviceMapper: libblockdev Reference Manual for libblockdev 3.4.0.

DeviceMapper

DeviceMapper — plugin for basic operations with device mapper

Functions

void	bd_dm_close ()
gboolean	bd_dm_init ()
GQuark	bd_dm_error_quark ()
gboolean	bd_dm_create_linear ()
gboolean	bd_dm_remove ()
gchar *	bd_dm_name_from_node ()
gchar *	bd_dm_node_from_name ()
gboolean	bd_dm_map_exists ()
gchar *	bd_dm_get_subsystem_from_name ()
gboolean	bd_dm_is_tech_avail ()

Types and Values

#define	BD_DM_ERROR
enum	BDDMError
enum	BDDMTech
enum	BDDMTechMode

Includes

#include <dm.h>

Description

A plugin for basic operations with device mapper.

Functions

bd_dm_close ()

void
bd_dm_close (void);

Cleans up after the plugin. **This function is called automatically by the library's functions that unload it.**

bd_dm_init ()

gboolean
bd_dm_init (void);

Initializes the plugin. **This function is called automatically by the library's initialization functions.**

bd_dm_error_quark ()

GQuark
bd_dm_error_quark (void);

[skip]

bd_dm_create_linear ()

gboolean
bd_dm_create_linear (const gchar *map_name,
                     const gchar *device,
                     guint64 length,
                     const gchar *uuid,
                     GError **error);

Parameters

map_name	name of the map
device	device to create map for
length	length of the mapping in sectors
uuid	UUID for the new dev mapper device or `NULL` if not specified.	[nullable]
error	place to store error (if any).	[out][optional]

Returns

whether the new linear mapping map_name was successfully created for the device or not

Tech category: BD_DM_TECH_MAP-BD_DM_TECH_MODE_CREATE_ACTIVATE

bd_dm_remove ()

gboolean
bd_dm_remove (const gchar *map_name,
              GError **error);

Parameters

map_name	name of the map to remove
error	place to store error (if any).	[out][optional]

Returns

whether the map_name map was successfully removed or not

Tech category: BD_DM_TECH_MAP-BD_DM_TECH_MODE_REMOVE_DEACTIVATE

bd_dm_name_from_node ()

gchar *
bd_dm_name_from_node (const gchar *dm_node,
                      GError **error);

Parameters

dm_node	name of the DM node (e.g. "dm-0")
error	place to store error (if any).	[out][optional]

Returns

map name of the map providing the dm_node device or NULL (error ) contains the error in such cases

Tech category: BD_DM_TECH_MAP-BD_DM_TECH_MODE_QUERY

bd_dm_node_from_name ()

gchar *
bd_dm_node_from_name (const gchar *map_name,
                      GError **error);

Parameters

map_name	name of the queried DM map
error	place to store error (if any).	[out][optional]

Returns

DM node name for the map_name map or NULL (error ) contains the error in such cases

Tech category: BD_DM_TECH_MAP-BD_DM_TECH_MODE_QUERY

bd_dm_map_exists ()

gboolean
bd_dm_map_exists (const gchar *map_name,
                  gboolean live_only,
                  gboolean active_only,
                  GError **error);

Parameters

map_name	name of the queried map
live_only	whether to go through the live maps only or not
active_only	whether to ignore suspended maps or not
error	place to store error (if any).	[out][optional]

Returns

whether the given map_name exists (and is live if live_only is TRUE (and is active if active_only is TRUE)).

Tech category: BD_DM_TECH_MAP-BD_DM_TECH_MODE_QUERY

bd_dm_get_subsystem_from_name ()

gchar *
bd_dm_get_subsystem_from_name (const gchar *device_name,
                               GError **error);

Parameters

device_name	name of the device
error	place to store error (if any).	[out][optional]

Returns

subsystem of the given device

Tech category: BD_DM_TECH_MAP-BD_DM_TECH_MODE_QUERY

bd_dm_is_tech_avail ()

gboolean
bd_dm_is_tech_avail (BDDMTech tech,
                     guint64 mode,
                     GError **error);

Parameters

tech	the queried tech
mode	a bit mask of queried modes of operation (BDDMTechMode) for `tech`
error	place to store error (details about why the `tech` -`mode` combination is not available).	[out][optional]

Returns

whether the tech -mode combination is available -- supported by the plugin implementation and having all the runtime dependencies available

Types and Values

BD_DM_ERROR

#define             BD_DM_ERROR

enum BDDMError

Members

BD_DM_ERROR_TECH_UNAVAIL
BD_DM_ERROR_SYS
BD_DM_ERROR_NOT_ROOT
BD_DM_ERROR_TASK
BD_DM_ERROR_RAID_FAIL
BD_DM_ERROR_RAID_NO_DEVS
BD_DM_ERROR_RAID_NO_EXIST

enum BDDMTech

Members

BD_DM_TECH_MAP

enum BDDMTechMode

Members

BD_DM_TECH_MODE_CREATE_ACTIVATE
BD_DM_TECH_MODE_REMOVE_DEACTIVATE
BD_DM_TECH_MODE_QUERY