#include "os0file.h"
#include "mach0data.h"
#include "mtr0mtr.h"
#include "srv0mon.h"

Include dependency graph for log0log.ic:

This graph shows which files directly or indirectly include this file:

Functions
UNIV_INLINE ibool	log_block_get_flush_bit (const byte *log_block)
UNIV_INLINE void	log_block_set_flush_bit (byte *log_block, ibool val)
UNIV_INLINE ulint	log_block_get_hdr_no (const byte *log_block)
UNIV_INLINE void	log_block_set_hdr_no (byte *log_block, ulint n)
UNIV_INLINE ulint	log_block_get_data_len (const byte *log_block)
UNIV_INLINE void	log_block_set_data_len (byte *log_block, ulint len)
UNIV_INLINE ulint	log_block_get_first_rec_group (const byte *log_block)
UNIV_INLINE void	log_block_set_first_rec_group (byte *log_block, ulint offset)
UNIV_INLINE ulint	log_block_get_checkpoint_no (const byte *log_block)
UNIV_INLINE void	log_block_set_checkpoint_no (byte *log_block, ib_uint64_t no)
UNIV_INLINE ulint	log_block_convert_lsn_to_no (lsn_t lsn)
UNIV_INLINE ulint	log_block_calc_checksum (const byte *block)
UNIV_INLINE ulint	log_block_get_checksum (const byte *log_block)
UNIV_INLINE void	log_block_set_checksum (byte *log_block, ulint checksum)
UNIV_INLINE void	log_block_init (byte *log_block, lsn_t lsn)
UNIV_INLINE void	log_block_init_in_old_format (byte *log_block, lsn_t lsn)
UNIV_INLINE lsn_t	log_reserve_and_write_fast (const void str, ulint len, lsn_t start_lsn)
UNIV_INLINE void	log_release (void)
UNIV_INLINE lsn_t	log_get_lsn (void)
UNIV_INLINE lsn_t	log_get_capacity (void)
UNIV_INLINE lsn_t	log_get_max_modified_age_async (void)
UNIV_INLINE void	log_free_check (void)

Detailed Description

Database log

Created 12/9/1995 Heikki Tuuri

Function Documentation

UNIV_INLINE ulint log_block_calc_checksum ( const byte * block )

Calculates the checksum for a log block.

Returns: checksum

Parameters

block in: log block

UNIV_INLINE ulint log_block_convert_lsn_to_no ( lsn_t lsn )

Converts a lsn to a log block number.

Returns: log block number, it is > 0 and <= 1G

Parameters

lsn	in: lsn of a byte within the block

UNIV_INLINE ulint log_block_get_checkpoint_no ( const byte * log_block )

Gets a log block checkpoint number field (4 lowest bytes).

Returns: checkpoint no (4 lowest bytes)

Parameters

log_block in: log block

UNIV_INLINE ulint log_block_get_checksum ( const byte * log_block )

Gets a log block checksum field value.

Returns: checksum

Parameters

log_block in: log block

UNIV_INLINE ulint log_block_get_data_len ( const byte * log_block )

Gets a log block data length.

Returns: log block data length measured as a byte offset from the block start

Parameters

log_block in: log block

UNIV_INLINE ulint log_block_get_first_rec_group ( const byte * log_block )

Gets a log block first mtr log record group offset.

Returns: first mtr log record group byte offset from the block start, 0 if none

Parameters

log_block in: log block

UNIV_INLINE ibool log_block_get_flush_bit ( const byte * log_block )

Gets a log block flush bit.

Returns: TRUE if this block was the first to be written in a log flush

Parameters

log_block in: log block

UNIV_INLINE ulint log_block_get_hdr_no ( const byte * log_block )

Gets a log block number stored in the header.

Returns: log block number stored in the block header

Parameters

log_block in: log block

UNIV_INLINE void log_block_init	(	byte *	log_block,
		lsn_t	lsn
	)

Initializes a log block in the log buffer.

Parameters

log_block	in: pointer to the log buffer
lsn	in: lsn within the log block

UNIV_INLINE void log_block_init_in_old_format	(	byte *	log_block,
		lsn_t	lsn
	)

Initializes a log block in the log buffer in the old format, where there was no checksum yet.

Parameters

log_block	in: pointer to the log buffer
lsn	in: lsn within the log block

UNIV_INLINE void log_block_set_checkpoint_no	(	byte *	log_block,
		ib_uint64_t	no
	)

Sets a log block checkpoint number field (4 lowest bytes).

Parameters

log_block	in/out: log block
no	in: checkpoint no

UNIV_INLINE void log_block_set_checksum	(	byte *	log_block,
		ulint	checksum
	)

Sets a log block checksum field value.

Parameters

log_block	in/out: log block
checksum	in: checksum

UNIV_INLINE void log_block_set_data_len	(	byte *	log_block,
		ulint	len
	)

Sets the log block data length.

Parameters

log_block	in/out: log block
len	in: data length

UNIV_INLINE void log_block_set_first_rec_group	(	byte *	log_block,
		ulint	offset
	)

Sets the log block first mtr log record group offset.

Parameters

log_block	in/out: log block
offset	in: offset, 0 if none

UNIV_INLINE void log_block_set_flush_bit	(	byte *	log_block,
		ibool	val
	)

Sets the log block flush bit.

Parameters

log_block	in/out: log block
val	in: value to set

UNIV_INLINE void log_block_set_hdr_no	(	byte *	log_block,
		ulint	n
	)

Sets the log block number stored in the header; NOTE that this must be set before the flush bit!

Parameters

log_block	in/out: log block
n	in: log block number: must be > 0 and < LOG_BLOCK_FLUSH_BIT_MASK

UNIV_INLINE void log_free_check ( void )

Checks if there is need for a log buffer flush or a new checkpoint, and does this if yes. Any database operation should call this when it has modified more than about 4 pages. NOTE that this function may only be called when the OS thread owns no synchronization objects except the dictionary mutex.

UNIV_INLINE lsn_t log_get_lsn ( void )

Gets the current lsn.

Returns: current lsn

UNIV_INLINE void log_release ( void )

Releases the log mutex.

UNIV_INLINE lsn_t log_reserve_and_write_fast	(	const void *	str,
		ulint	len,
		lsn_t *	start_lsn
	)

Writes to the log the string given. The log must be released with log_release.

Returns: end lsn of the log record, zero if did not succeed

Parameters

str	in: string
len	in: string length
start_lsn	out: start lsn of the log record

Functions

Detailed Description

Function Documentation