UUID support

Macros
#define	M0_TRACE_SUBSYSTEM   M0_TRACE_SUBSYS_LIB
#define	M0_TRACE_SUBSYSTEM   M0_TRACE_SUBSYS_LIB

Enumerations
enum	{ MACHINE_ID_LEN = 32 }
enum	{ M0_UUID_STRLEN = 36 }

Functions
	module_param (node_uuid, charp, S_IRUGO)
	MODULE_PARM_DESC (node_uuid, "UUID of Motr node")
static const char *	m0_param_node_uuid_get (void)
int	m0_node_uuid_string_get (char buf[M0_UUID_STRLEN+1])
void	m0_kmod_uuid_file_set (const char *path)
void	m0_node_uuid_string_set (const char *uuid)
M0_INTERNAL int	m0_uuid_parse (const char *str, struct m0_uint128 *val)
M0_INTERNAL void	m0_uuid_format (const struct m0_uint128 *val, char *buf, size_t len)
M0_INTERNAL void	m0_uuid_generate (struct m0_uint128 *u)

Variables
static char *	node_uuid = "00000000-0000-0000-0000-000000000000"
static const char *	uuid_file = "/etc/machine-id"
static char	default_node_uuid [M0_UUID_STRLEN+1]
static bool	use_default_node_uuid = false
M0_EXTERN struct m0_uint128	m0_node_uuid

Detailed Description

Macro Definition Documentation

M0_TRACE_SUBSYSTEM [1/2]

#define M0_TRACE_SUBSYSTEM   M0_TRACE_SUBSYS_LIB

Definition at line 30 of file uuuid.c.

M0_TRACE_SUBSYSTEM [2/2]

#define M0_TRACE_SUBSYSTEM   M0_TRACE_SUBSYS_LIB

Definition at line 32 of file kuuid.c.

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
MACHINE_ID_LEN

Definition at line 39 of file uuuid.c.

anonymous enum

anonymous enum

Enumerator
M0_UUID_STRLEN

Definition at line 35 of file uuid.h.

Function Documentation

m0_kmod_uuid_file_set()

void m0_kmod_uuid_file_set

(

const char *

path

)

Definition at line 59 of file uuuid.c.

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m0_node_uuid_string_get()

int m0_node_uuid_string_get

(

char

buf[M0_UUID_STRLEN+1]

)

Construct the node uuid from the kernel's node_uuid parameter.

Constructs the node UUID in user space by reading our kernel module's node_uuid parameter.

Definition at line 51 of file kuuid.c.

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m0_node_uuid_string_set()

void m0_node_uuid_string_set

(

const char *

uuid

)

Definition at line 64 of file uuuid.c.

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m0_param_node_uuid_get()

static const char* m0_param_node_uuid_get ( void  )

static

Return the value of the kernel node_uuid parameter.

Definition at line 43 of file kuuid.c.

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m0_uuid_format()

M0_INTERNAL void m0_uuid_format	(	const struct m0_uint128 *	val,
		char *	buf,
		size_t	len
	)

Produce the 8-4-4-4-12 hexadecimal string representation of a UUID from its numerical form. See Universally unique identifier for more details.

Parameters

val	The numerical UUID.
buf	String buffer.
len	Length of the buffer. It must be at least M0_UUID_STRLEN+1 bytes long.

Definition at line 107 of file uuid.c.

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m0_uuid_generate()

M0_INTERNAL void m0_uuid_generate

(

struct m0_uint128 *

u

)

Definition at line 44 of file uuid.c.

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m0_uuid_parse()

M0_INTERNAL int m0_uuid_parse	(	const char *	str,
		struct m0_uint128 *	val
	)

Parse the 8-4-4-4-12 hexadecimal string representation of a UUID and convert to numerical form. See Universally unique identifier for more details.

Definition at line 77 of file uuid.c.

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module_param()

module_param	(	node_uuid	,
		charp	,
		S_IRUGO
	)

MODULE_PARM_DESC()

MODULE_PARM_DESC	(	node_uuid	,
		"UUID of Motr node"
	)

Variable Documentation

default_node_uuid

char default_node_uuid[M0_UUID_STRLEN+1]

static

Initial value:

=
                "00000000-0000-0000-0000-000000000000"

Default node uuid which can be used instead of a "real" one, which is obtained from kernel module; this can be handy for some utility applications which don't need full functionality of libmotr.so, so they can provide some fake uuid.

Definition at line 53 of file uuuid.c.

m0_node_uuid

M0_EXTERN struct m0_uint128 m0_node_uuid

The UUID of a Motr node.

Definition at line 65 of file uuid.h.

node_uuid

char* node_uuid = "00000000-0000-0000-0000-000000000000"

static

Definition at line 36 of file kuuid.c.

use_default_node_uuid

bool use_default_node_uuid = false

static

Flag, which specify whether to use a "real" node uuid or a default one.

Definition at line 57 of file uuuid.c.

uuid_file

const char* uuid_file = "/etc/machine-id"

static

The default path to read node uuid parameter is "etc/machine-id". It can be updated in the function m0_kmod_uuid_file_set().

Definition at line 46 of file uuuid.c.