LUKS2 Device persistent flags and requirements

Macros
#define	CRYPT_REQUIREMENT_OFFLINE_REENCRYPT   (UINT32_C(1) << 0)
#define	CRYPT_REQUIREMENT_ONLINE_REENCRYPT   (UINT32_C(1) << 1)
#define	CRYPT_REQUIREMENT_OPAL   (UINT32_C(1) << 2)
#define	CRYPT_REQUIREMENT_INLINE_HW_TAGS   (UINT32_C(1) << 3)
#define	CRYPT_REQUIREMENT_UNKNOWN   (UINT32_C(1) << 31)

Enumerations
enum	crypt_flags_type { CRYPT_FLAGS_ACTIVATION , CRYPT_FLAGS_REQUIREMENTS }

Functions
int	crypt_persistent_flags_set (struct crypt_device *cd, crypt_flags_type type, uint32_t flags)
int	crypt_persistent_flags_get (struct crypt_device *cd, crypt_flags_type type, uint32_t *flags)

Detailed Description

Macro Definition Documentation

CRYPT_REQUIREMENT_INLINE_HW_TAGS

#define CRYPT_REQUIREMENT_INLINE_HW_TAGS   (UINT32_C(1) << 3)

Device configured with inline HW tags

CRYPT_REQUIREMENT_OFFLINE_REENCRYPT

#define CRYPT_REQUIREMENT_OFFLINE_REENCRYPT   (UINT32_C(1) << 0)

LUKS2 header requirements Unfinished offline reencryption

CRYPT_REQUIREMENT_ONLINE_REENCRYPT

#define CRYPT_REQUIREMENT_ONLINE_REENCRYPT   (UINT32_C(1) << 1)

Online reencryption in-progress

CRYPT_REQUIREMENT_OPAL

#define CRYPT_REQUIREMENT_OPAL   (UINT32_C(1) << 2)

Device configured with OPAL support

CRYPT_REQUIREMENT_UNKNOWN

#define CRYPT_REQUIREMENT_UNKNOWN   (UINT32_C(1) << 31)

unknown requirement in header (output only)

Enumeration Type Documentation

crypt_flags_type

enum crypt_flags_type

Persistent flags type

Enumerator
CRYPT_FLAGS_ACTIVATION	activation flags, See also aflags
CRYPT_FLAGS_REQUIREMENTS	requirements flags

Function Documentation

crypt_persistent_flags_get()

int crypt_persistent_flags_get	(	struct crypt_device *	cd,
		crypt_flags_type	type,
		uint32_t *	flags
	)

Get persistent flags stored in header.

Parameters

cd	crypt device handle (can be NULL)
type	flags type to retrieve (CRYPT_FLAGS_ACTIVATION or CRYPT_FLAGS_REQUIREMENTS)
flags	reference to output variable

Returns

0 on success or negative errno value otherwise

crypt_persistent_flags_set()

int crypt_persistent_flags_set	(	struct crypt_device *	cd,
		crypt_flags_type	type,
		uint32_t	flags
	)

Set persistent flags.

Parameters

cd	crypt device handle (can be NULL)
type	type to set (CRYPT_FLAGS_ACTIVATION or CRYPT_FLAGS_REQUIREMENTS)
flags	flags to set

Returns

0 on success or negative errno value otherwise

Note

Valid only for LUKS2.

Not all activation flags can be stored. Only CRYPT_ACTIVATE_ALLOW_DISCARDS, CRYPT_ACTIVATE_SAME_CPU_CRYPT, CRYPT_ACTIVATE_SUBMIT_FROM_CRYPT_CPUS, CRYPT_ACTIVATE_NO_JOURNAL, CRYPT_ACTIVATE_NO_READ_WORKQUEUE, CRYPT_ACTIVATE_NO_WRITE_WORKQUEUE and CRYPT_ACTIVATE_HIGH_PRIORITY can be stored persistently.

Only requirements flags recognised by current library may be set. CRYPT_REQUIREMENT_UNKNOWN is illegal (output only) in set operation.