UDisksState

UDisksState — Object used for recording state and cleaning up

Functions

UDisksState * udisks_state_new ()
void udisks_state_start_cleanup ()
void udisks_state_stop_cleanup ()
void udisks_state_check ()
void udisks_state_check_sync ()
void udisks_state_check_block ()
UDisksDaemon * udisks_state_get_daemon ()
void udisks_state_add_mounted_fs ()
gchar * udisks_state_find_mounted_fs ()
void udisks_state_add_unlocked_crypto_dev ()
dev_t udisks_state_find_unlocked_crypto_dev ()
void udisks_state_add_loop ()
gboolean udisks_state_has_loop ()
void udisks_state_add_mdraid ()
gboolean udisks_state_has_mdraid ()

Properties

UDisksDaemon * daemon Read / Write / Construct Only

Types and Values

  UDisksState

Object Hierarchy

    GObject
    ╰── UDisksState

Description

This type is used for recording actions done by users and cleaning up when devices set up via the udisks interfaces are removed while still in use - for example, a USB stick being yanked.

The following files are used:

Table 3. Persistent information and state

File Usage
/run/udisks2/mounted-fs A serialized 'a{sa{sv}}' GVariant mapping from the mount point (e.g. /media/EOS_DIGITAL) into a set of details. Known details include block-device (of type 't') that is the dev_t for the mounted device, mounted-by-uid (of type 'u') that is the uid_t of the user who mounted the device, and fstab-mount (of type 'b') that is TRUE if the device was mounted via an entry in /etc/fstab. Contains only non-persistent mount points. This state file is typically stored on a non-persistent filesystem.
/var/lib/udisks2/mounted-fs-persistent Similar in contents and data structure to /run/udisks2/mounted-fs except that only persistent mount points are stored there. This state file is typically stored on a persistent filesystem.
/run/udisks2/unlocked-crypto-dev A serialized 'a{ta{sv}}' GVariant mapping from the dev_t of the clear-text device (e.g. /dev/dm-0) into a set of details. Known details include crypto-device (of type 't') that is the dev_t for the crypto-text device, dm-uuid (of type 'ay') that is the device mapper UUID for the clear-text device and unlocked-by-uid (of type 'u') that is the uid_t of the user who unlocked the device.
/run/udisks2/loop A serialized 'a{sa{sv}}' GVariant mapping from the loop device name (e.g. /dev/loop0) into a set of details. Known details include backing-file (of type 'ay') for the name of the backing file and backing-file-device (of type 't') for the dev_t for of the device holding the backing file (or 0 if unknown) and setup-by-uid (of type 'u') that is the uid_t of the user who set up the loop device.
/run/udisks2/mdraid A serialized 'a{ta{sv}}' GVariant mapping from the dev_t of the raid device (e.g. /dev/md127) into a set of details. Known details include started-by-uid (of type 'u') that is the uid_t of the user who started the array.

Cleaning up is implemented by running a thread (to ensure that actions are serialized) that checks all data in the files mentioned above and cleans up the entry in question by e.g. unmounting a filesystem, removing a mount point or tearing down a device-mapper device when needed. The clean-up thread itself needs to be manually kicked using e.g. udisks_state_check() from suitable places in the UDisksDaemon and UDisksProvider implementations.

Since cleaning up is only necessary when a device has been removed without having been properly stopped or shut down, the fact that it was cleaned up is logged to ensure that the information is brought to the attention of the system administrator.

Functions

udisks_state_new ()

UDisksState *
udisks_state_new (UDisksDaemon *daemon);

Creates a new UDisksState object.

Parameters

daemon

A UDisksDaemon.

  

Returns

A UDisksState that should be freed with g_object_unref().

udisks_state_start_cleanup ()

void
udisks_state_start_cleanup (UDisksState *state);

Starts the clean-up thread.

The clean-up thread will hold a reference to state for as long as it's running - use udisks_state_stop_cleanup() to stop it.

Parameters

state

A UDisksState.

  

udisks_state_stop_cleanup ()

void
udisks_state_stop_cleanup (UDisksState *state);

Stops the clean-up thread. Blocks the calling thread until it has stopped.

Parameters

state

A UDisksState.

  

udisks_state_check ()

void
udisks_state_check (UDisksState *state);

Causes the clean-up thread for state to check if anything should be cleaned up.

This can be called from any thread and will not block the calling thread.

Parameters

state

A UDisksState.

  

udisks_state_check_sync ()

void
udisks_state_check_sync (UDisksState *state);

Causes the clean-up thread for state to check if anything should be cleaned up and perform the cleanup.

This can be called from any thread and in contrast to udisks_state_check() will block the calling thread until cleanup is finished.

Parameters

state

A UDisksState.

  

udisks_state_check_block ()

void
udisks_state_check_block (UDisksState *state,
                          dev_t block_device);

Performs cleanup of a mounted filesystem over a single block device. In case the clean-up thread is busy, waits until the current iteration is finished.

This can be called from any thread and will block the calling thread until cleanup is finished. Note that this ignores UDisksLinuxBlockObject cleanup lock that is supposed to be held by the caller.

Parameters

state

A UDisksState.

  

block_device

Device number of the block device to check.

  

udisks_state_get_daemon ()

UDisksDaemon *
udisks_state_get_daemon (UDisksState *state);

Gets the daemon used by state .

Parameters

state

A UDisksState.

  

Returns

A UDisksDaemon. Do not free, the object is owned by state .

udisks_state_add_mounted_fs ()

void
udisks_state_add_mounted_fs (UDisksState *state,
                             const gchar *mount_point,
                             dev_t block_device,
                             uid_t uid,
                             gboolean fstab_mount,
                             gboolean persistent);

Adds a new entry to the /run/udisks2/mounted-fs file.

Parameters

state

A UDisksState.

  

block_device

The block device.

  

mount_point

The mount point.

  

uid

The user id of the process requesting the device to be mounted.

  

fstab_mount

TRUE if the device was mounted via /etc/fstab.

  

persistent

TRUE if the mount point is on a persistent filesystem.

  

udisks_state_find_mounted_fs ()

gchar *
udisks_state_find_mounted_fs (UDisksState *state,
                              dev_t block_device,
                              uid_t *out_uid,
                              gboolean *out_fstab_mount);

Gets the mount point for block_device , if it exists in the /run/udisks2/mounted-fs file.

Parameters

state

A UDisksState.

  

block_device

The block device.

  

out_uid

Return location for the user id who mounted the device or NULL.

  

out_fstab_mount

Return location for whether the device was a fstab mount or NULL.

  

Returns

The mount point for block_device or NULL if not found.

udisks_state_add_unlocked_crypto_dev ()

void
udisks_state_add_unlocked_crypto_dev (UDisksState *state,
                                      dev_t cleartext_device,
                                      dev_t crypto_device,
                                      const gchar *dm_uuid,
                                      uid_t uid);

Adds a new entry to the /run/udisks2/unlocked-crypto-dev file.

Parameters

state

A UDisksState.

  

cleartext_device

The clear-text device.

  

crypto_device

The crypto device.

  

dm_uuid

The UUID of the unlocked dm device.

  

uid

The user id of the process requesting the device to be unlocked.

  

udisks_state_find_unlocked_crypto_dev ()

dev_t
udisks_state_find_unlocked_crypto_dev (UDisksState *state,
                                       dev_t crypto_device,
                                       uid_t *out_uid);

Gets the clear-text device for crypto_device , if it exists in the /run/udisks2/unlocked-crypto-dev file.

Parameters

state

A UDisksState.

  

crypto_device

The block device.

  

out_uid

Return location for the user id who mounted the device or NULL.

  

Returns

The cleartext device for crypto_device or 0 if not found.

udisks_state_add_loop ()

void
udisks_state_add_loop (UDisksState *state,
                       const gchar *device_file,
                       const gchar *backing_file,
                       dev_t backing_file_device,
                       uid_t uid);

Adds a new entry to the /run/udisks2/loop file.

Parameters

state

A UDisksState.

  

device_file

The loop device file.

  

backing_file

The backing file.

  

backing_file_device

The dev_t of the backing file or 0 if unknown.

  

uid

The user id of the process requesting the loop device.

  

udisks_state_has_loop ()

gboolean
udisks_state_has_loop (UDisksState *state,
                       const gchar *device_file,
                       uid_t *out_uid);

Checks if device_file is set up via udisks.

Parameters

state

A UDisksState

  

device_file

A loop device file.

  

out_uid

Return location for the user id who setup the loop device or NULL.

  

Returns

TRUE if set up via udisks, otherwise FALSE or if error is set.

udisks_state_add_mdraid ()

void
udisks_state_add_mdraid (UDisksState *state,
                         dev_t raid_device,
                         uid_t uid);

Adds a new entry to the /run/udisks2/mdraid file.

Parameters

state

A UDisksState.

  

raid_device

The dev_t for the RAID device.

  

uid

The user id of the process requesting the loop device.

  

udisks_state_has_mdraid ()

gboolean
udisks_state_has_mdraid (UDisksState *state,
                         dev_t raid_device,
                         uid_t *out_uid);

Checks if raid_device is set up via udisks.

Parameters

state

A UDisksState

  

raid_device

A dev_t for the RAID device.

  

out_uid

Return location for the user id who setup the loop device or NULL.

  

Returns

TRUE if set up via udisks, otherwise FALSE or if error is set.

Types and Values

UDisksState

typedef struct _UDisksState UDisksState;

The UDisksState structure contains only private data and should only be accessed using the provided API.

Property Details

The “daemon” property

  “daemon”                   UDisksDaemon *

The UDisksDaemon object.

Owner: UDisksState

Flags: Read / Write / Construct Only

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