dm-log-userspace-transfer.h File Reference

Go to the source code of this file.

Macros
#define	DM_MSG_PREFIX   "dm-log-userspace"

Functions
int	dm_ulog_tfr_init (void)
void	dm_ulog_tfr_exit (void)
int	dm_consult_userspace (const char *uuid, uint64_t luid, int request_type, char *data, size_t data_size, char *rdata, size_t *rdata_size)

Macro Definition Documentation

#define DM_MSG_PREFIX   "dm-log-userspace"

Definition at line 10 of file dm-log-userspace-transfer.h.

Function Documentation

int dm_consult_userspace	(	const char *	uuid,
		uint64_t	luid,
		int	request_type,
		char *	data,
		size_t	data_size,
		char *	rdata,
		size_t *	rdata_size
	)

dm_consult_userspace : log's universal unique identifier (must be DM_UUID_LEN in size) : log's local unique identifier : found in include/linux/dm-log-userspace.h : data to tx to the server : size of data in bytes : place to put return data from server : value-result (amount of space given/amount of space used)

rdata_size is undefined on failure.

Memory used to communicate with userspace is zero'ed before populating to ensure that no unwanted bits leak from kernel space to user-space. All userspace log communications between kernel and user space go through this function.

Returns: 0 on success, -EXXX on failure

Definition at line 170 of file dm-log-userspace-transfer.c.

void dm_ulog_tfr_exit

(

void

)

Definition at line 282 of file dm-log-userspace-transfer.c.

int dm_ulog_tfr_init

(

void

)

Definition at line 259 of file dm-log-userspace-transfer.c.