log0files_io.cc File Reference

#include <fcntl.h>
#include <unistd.h>
#include <algorithm>
#include <cstring>
#include <limits>
#include <sstream>
#include "log0files_io.h"
#include "log0pre_8_0_30.h"
#include "log0types.h"
#include "mach0data.h"
#include "my_dbug.h"
#include "os0file.h"
#include "ut0new.h"
#include "ut0rnd.h"
#include "srv0srv.h"

Classes
struct	Log_file_block
	Used for reads/writes to redo files within this module. More...

Functions
bool	log_header_checksum_is_ok (const byte *buf)
	Computes checksum of the given header and verifies if the checksum is the same as the one stored in that header. More...
Log - file header read/write.
static void	log_file_header_validate (const Log_file_header &header)
	Asserts that the provided file header seems correct. More...
static Log_flags	log_file_header_flag_bit (uint32_t bit)
	Converts flag number to the mask with this flag turned on. More...
void	log_file_header_serialize (const Log_file_header &header, byte *buf)
	Serializes the log file header to the buffer. More...
bool	log_file_header_deserialize (const byte *buf, Log_file_header &header)
	Deserializes the log file header stored in the buffer. More...
dberr_t	log_file_header_write (Log_file_handle &file_handle, const Log_file_header &header)
	Serializes and writes the log file header to the log file. More...
dberr_t	log_file_header_write (Log_file_handle &file_handle, const byte *buf)
	Writes the serialized log file header to the log file. More...
dberr_t	log_file_header_read (Log_file_handle &file_handle, byte *buf)
	Reads the serialized log file header to the buffer. More...
dberr_t	log_file_header_read (Log_file_handle &file_handle, Log_file_header &header)
	Reads and deserializes the log file header. More...
void	log_file_header_set_flag (Log_flags &log_flags, uint32_t bit)
	Sets a specific flag in the mask built of redo log flags. More...
void	log_file_header_reset_flag (Log_flags &log_flags, uint32_t bit)
	Resets a specific flag in the mask built of redo log flags. More...
bool	log_file_header_check_flag (Log_flags log_flags, uint32_t bit)
	Checks if a specific flag is set in the mask built of redo log flags. More...
Log - checkpoint header read/write.
static os_offset_t	log_checkpoint_header_offset (Log_checkpoint_header_no checkpoint_header_no)
	Computes offset from the beginning of the redo file to the checkpoint header for provided checkpoint header number. More...
void	log_checkpoint_header_serialize (const Log_checkpoint_header &header, byte *buf)
	Serializes the log checkpoint header to the buffer. More...
bool	log_checkpoint_header_deserialize (const byte *buf, Log_checkpoint_header &header)
	Deserializes the log checkpoint header stored in the buffer. More...
dberr_t	log_checkpoint_header_write (Log_file_handle &file_handle, Log_checkpoint_header_no checkpoint_header_no, const Log_checkpoint_header &header)
	Serializes and writes the log checkpoint header to the log file. More...
dberr_t	log_checkpoint_header_write (Log_file_handle &file_handle, Log_checkpoint_header_no checkpoint_header_no, const byte *buf)
	Writes the serialized checkpoint header to the log file. More...
dberr_t	log_checkpoint_header_read (Log_file_handle &file_handle, Log_checkpoint_header_no checkpoint_header_no, byte *buf)
	Reads the serialized log checkpoint header to the buffer. More...
dberr_t	log_checkpoint_header_read (Log_file_handle &file_handle, Log_checkpoint_header_no checkpoint_header_no, Log_checkpoint_header &header)
	Reads and deserializes the log checkpoint header. More...
Log data blocks
static void	log_data_blocks_validate (os_offset_t offset, os_offset_t size)
	Asserts that the provided <offset, size> defines one or more redo data blocks within a log file. More...
dberr_t	log_data_blocks_write (Log_file_handle &file_handle, os_offset_t write_offset, size_t write_size, const byte *buf)
	Writes the formatted log blocks with redo records to the log file. More...
dberr_t	log_data_blocks_read (Log_file_handle &file_handle, os_offset_t read_offset, size_t read_size, byte *buf)
	Reads log blocks with redo records from the log file, starting at the given offset. More...
Log - file creation / deletion
static void	log_flush_directory_low (const std::string &path)
	Fsyncs the given directory. More...
static dberr_t	log_rename_file_low (const Log_files_context &context, const std::string &old_file_path, const std::string &new_file_path, int err_msg_id)
	Renames the log file. More...
static dberr_t	log_remove_file_low (const Log_files_context &context, const std::string &file_path, int err_msg_id)
	Delete the log file at the provided file path. More...
static dberr_t	log_resize_file_low (const std::string &file_path, os_offset_t size_in_bytes, int err_msg_id)
	Resizes the log file at the provided file path. More...
static dberr_t	log_check_file (const Log_files_context &ctx, Log_file_id file_id, bool read_only, os_offset_t &size_in_bytes)
	Checks if a log file exists and can be opened with srv_read_only_mode mode. More...
dberr_t	log_rename_unused_file (const Log_files_context &ctx, Log_file_id old_unused_file_id, Log_file_id new_unused_file_id)
	Renames the unused file to another unused file. More...
dberr_t	log_mark_file_as_in_use (const Log_files_context &ctx, Log_file_id file_id)
	Renames a temporary log file to the non-temporary log file. More...
dberr_t	log_mark_file_as_unused (const Log_files_context &ctx, Log_file_id file_id)
	Renames a non-temporary log file to the temporary log file. More...
dberr_t	log_remove_unused_file (const Log_files_context &ctx, Log_file_id file_id)
	Removes a temporary log file, if it existed. More...
std::pair< dberr_t, ut::vector< Log_file_id > >	log_remove_unused_files (const Log_files_context &ctx)
	Removes all temporary log files in the directory. More...
dberr_t	log_remove_file (const Log_files_context &ctx, Log_file_id file_id)
	Removes a log file, if it existed. More...
std::pair< dberr_t, Log_file_id >	log_remove_file (const Log_files_context &ctx)
	Removes a single existing log file (if it existed). More...
std::pair< dberr_t, ut::vector< Log_file_id > >	log_remove_files (const Log_files_context &ctx)
	Removes existing log files. More...
dberr_t	log_create_unused_file (const Log_files_context &ctx, Log_file_id file_id, os_offset_t size_in_bytes)
	Creates a new temporary log file and resizes the file to the given size. More...
dberr_t	log_resize_unused_file (const Log_files_context &ctx, Log_file_id file_id, os_offset_t size_in_bytes)
	Resizes an existing temporary log file to the given size. More...
dberr_t	log_resize_file (const Log_files_context &ctx, Log_file_id file_id, os_offset_t size_in_bytes)
	Resizes an existing log file to the given size. More...
dberr_t	log_collect_existing_files (const Log_files_context &ctx, bool read_only, ut::vector< Log_file_id_and_size > &found)
	Searches for all possible log files existing on disk in the log directory. More...
Log_uuid	log_generate_uuid ()
	Generate unique identifier for the redo log files. More...
Log - encryption header read/write.
dberr_t	log_encryption_header_write (Log_file_handle &file_handle, const byte *buf)
	Writes the serialized encryption meta data to the log file. More...
dberr_t	log_encryption_header_read (Log_file_handle &file_handle, byte *buf)
	Reads the serialized encryption meta data from the log file. More...
Log - file names and paths.
std::string	log_directory_path (const Log_files_context &ctx)
	Provides path to directory with redo log files. More...
std::string	log_file_name (const Log_files_context &ctx, Log_file_id file_id)
	Provides name of the log file with the given file id, e.g. More...
std::string	log_file_path (const Log_files_context &ctx, Log_file_id file_id)
	Provides full path to the log file, e.g. More...
std::string	log_file_path_for_unused_file (const Log_files_context &ctx, Log_file_id file_id)
	Provides full path to the temporary log file, e.g. More...
static bool	log_extract_id_from_file_name (const Log_files_context &ctx, const char *file_name, const char *expected_suffix, Log_file_id &extracted_id)
	Extracts identifier of the redo log file from its file name. More...
static dberr_t	log_list_existing_files_low (const Log_files_context &ctx, const char *suffix, ut::vector< Log_file_id > &ret)
	Lists existing redo files in the configured redo log directory, selecting redo log files which have a given suffix in their name. More...
dberr_t	log_list_existing_unused_files (const Log_files_context &ctx, ut::vector< Log_file_id > &ret)
	List existing unused log files in the directory. More...
dberr_t	log_list_existing_files (const Log_files_context &ctx, ut::vector< Log_file_id > &ret)
	List existing log files in the directory (does not include unused files). More...

Variables
Log_checksum_algorithm_atomic_ptr	log_checksum_algorithm_ptr
	Atomic pointer to the log checksum calculation function. More...

Function Documentation

log_check_file()

static dberr_t log_check_file ( const Log_files_context &  ctx, Log_file_id  file_id, bool  read_only, os_offset_t &  size_in_bytes  )

static

Checks if a log file exists and can be opened with srv_read_only_mode mode.

If that is successful, reads the size of the file and provides it.

Parameters

[in]	ctx	redo log files context
[in]	file_id	id of the file to check and open
[in]	read_only	true: check file permissions only for reading false: check for both reading and writing
[out]	size_in_bytes	size of the file, in bytes

Returns

DB_SUCCESS, DB_NOT_FOUND or DB_ERROR

log_checkpoint_header_deserialize()

bool log_checkpoint_header_deserialize	(	const byte *	buf,
		Log_checkpoint_header &	header
	)

Deserializes the log checkpoint header stored in the buffer.

Parameters

[in]	buf	the buffer to deserialize
[out]	header	the deserialized header

Returns

true iff checksum is correct

log_checkpoint_header_offset()

static os_offset_t log_checkpoint_header_offset ( Log_checkpoint_header_no  checkpoint_header_no )

static

Computes offset from the beginning of the redo file to the checkpoint header for provided checkpoint header number.

Parameters

[in]

checkpoint_header_no

checkpoint header for which offset to compute

Returns

offset from the beginning of the redo file

log_checkpoint_header_read() [1/2]

dberr_t log_checkpoint_header_read	(	Log_file_handle &	file_handle,
		Log_checkpoint_header_no	checkpoint_header_no,
		byte *	buf
	)

Reads the serialized log checkpoint header to the buffer.

Parameters

[in]	file_handle	handle for the opened log file
[in]	checkpoint_header_no	checkpoint header to read
[out]	buf	the allocated buffer for read

Returns

DB_SUCCESS or error

log_checkpoint_header_read() [2/2]

dberr_t log_checkpoint_header_read	(	Log_file_handle &	file_handle,
		Log_checkpoint_header_no	checkpoint_header_no,
		Log_checkpoint_header &	header
	)

Reads and deserializes the log checkpoint header.

Parameters

[in]	file_handle	handle for the opened log file
[in]	checkpoint_header_no	checkpoint header to read
[out]	header	the checkpoint header read

Returns

DB_SUCCESS or error

log_checkpoint_header_serialize()

void log_checkpoint_header_serialize	(	const Log_checkpoint_header &	header,
		byte *	buf
	)

Serializes the log checkpoint header to the buffer.

Parameters

[in]	header	the header to serialize
[out]	buf	the allocated buffer

log_checkpoint_header_write() [1/2]

dberr_t log_checkpoint_header_write	(	Log_file_handle &	file_handle,
		Log_checkpoint_header_no	checkpoint_header_no,
		const byte *	buf
	)

Writes the serialized checkpoint header to the log file.

Parameters

[in]	file_handle	handle for the opened log file
[in]	checkpoint_header_no	checkpoint header to be written
[in]	buf	buffer containing the serialized checkpoint header to write

Returns

DB_SUCCESS or error

log_checkpoint_header_write() [2/2]

dberr_t log_checkpoint_header_write	(	Log_file_handle &	file_handle,
		Log_checkpoint_header_no	checkpoint_header_no,
		const Log_checkpoint_header &	header
	)

Serializes and writes the log checkpoint header to the log file.

Parameters

[in]	file_handle	handle for the opened log file
[in]	checkpoint_header_no	checkpoint header to be written
[in]	header	the checkpoint header

Returns

DB_SUCCESS or error

log_collect_existing_files()

dberr_t log_collect_existing_files	(	const Log_files_context &	ctx,
		bool	read_only,
		ut::vector< Log_file_id_and_size > &	found
	)

Searches for all possible log files existing on disk in the log directory.

Performs only very minimal validation of the files, checking if files could be opened and have valid file size.

Parameters

[in]	ctx	context within which files exist
[in]	read_only	true: check file permissions only for reading, false: check for both reading and writing
[out]	found	list of <file_id, size of file> for each file found

Returns

DB_SUCCESS, DB_NOT_FOUND or DB_ERROR

log_create_unused_file()

dberr_t log_create_unused_file	(	const Log_files_context &	ctx,
		Log_file_id	file_id,
		os_offset_t	size_in_bytes
	)

Creates a new temporary log file and resizes the file to the given size.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the file to create
[in]	size_in_bytes	size of the file, in bytes

Returns

DB_SUCCESS or DB_ERROR

log_data_blocks_read()

dberr_t log_data_blocks_read	(	Log_file_handle &	file_handle,
		os_offset_t	read_offset,
		size_t	read_size,
		byte *	buf
	)

Reads log blocks with redo records from the log file, starting at the given offset.

The log blocks must exist within single log file.

Parameters

[in]	file_handle	handle for the opened log file
[in]	read_offset	offset from the beginning of the given file
[in]	read_size	size of the data to read (must be divisible by OS_FILE_LOG_BLOCK_SIZE)
[out]	buf	allocated buffer to fill by the read

Returns

DB_SUCCESS or error

log_data_blocks_validate()

static void log_data_blocks_validate ( os_offset_t  offset, os_offset_t  size  )

static

Asserts that the provided <offset, size> defines one or more redo data blocks within a log file.

Parameters

[in]	offset	expected offset to the beginning of data block(s)
[in]	size	size in bytes of data blocks starting from the offset

log_data_blocks_write()

dberr_t log_data_blocks_write	(	Log_file_handle &	file_handle,
		os_offset_t	write_offset,
		size_t	write_size,
		const byte *	buf
	)

Writes the formatted log blocks with redo records to the log file.

The given log blocks must fit within the same single log file.

Parameters

[in]	file_handle	handle for the opened log file
[in]	write_offset	offset from the beginning of the given file
[in]	write_size	size of the data to write (must be divisible by OS_FILE_LOG_BLOCK_SIZE)
[in]	buf	formatted log blocks with the data to write

Returns

DB_SUCCESS or error

log_directory_path()

std::string log_directory_path

(

const Log_files_context &

ctx

)

Provides path to directory with redo log files.

Parameters

[in]

ctx

context within which files exist

Returns

path to innodb_redo directory

log_encryption_header_read()

dberr_t log_encryption_header_read	(	Log_file_handle &	file_handle,
		byte *	buf
	)

Reads the serialized encryption meta data from the log file.

Parameters

[in]	file_handle	handle for the opened log file
[out]	buf	the allocated buffer for read

Returns

DB_SUCCESS or error

log_encryption_header_write()

dberr_t log_encryption_header_write	(	Log_file_handle &	file_handle,
		const byte *	buf
	)

Writes the serialized encryption meta data to the log file.

Parameters

[in]	file_handle	handle for the opened log file
[in]	buf	the filled encryption buffer to write

Returns

DB_SUCCESS or error

log_extract_id_from_file_name()

static bool log_extract_id_from_file_name ( const Log_files_context &  ctx, const char *  file_name, const char *  expected_suffix, Log_file_id &  extracted_id  )

static

Extracts identifier of the redo log file from its file name.

Function might be called for non-redo log files in which case it should return false instead of extracting the identifier.

Parameters

[in]	ctx	redo log files context
[in]	file_name	file name (can be wrong)
[in]	expected_suffix	suffix that should exist after id
[out]	extracted_id	extracted redo file identifier

Returns

true iff extracted the identifier properly

log_file_header_check_flag()

bool log_file_header_check_flag	(	Log_flags	log_flags,
		uint32_t	bit
	)

Checks if a specific flag is set in the mask built of redo log flags.

Parameters

[in]	log_flags	mask of log flags
[in]	bit	bit number to check (flag)

Returns

true, iff flag is set

log_file_header_deserialize()

bool log_file_header_deserialize	(	const byte *	buf,
		Log_file_header &	header
	)

Deserializes the log file header stored in the buffer.

Parameters

[in]	buf	the buffer to deserialize
[out]	header	the deserialized header

Returns

true iff checksum is correct

log_file_header_flag_bit()

static Log_flags log_file_header_flag_bit ( uint32_t  bit )

static

Converts flag number to the mask with this flag turned on.

Parameters

[in]

bit

flag bit number (but > 0)

Returns

bit mask value (2^(bit-1))

log_file_header_read() [1/2]

dberr_t log_file_header_read	(	Log_file_handle &	file_handle,
		byte *	buf
	)

Reads the serialized log file header to the buffer.

Parameters

[in]	file_handle	handle for the opened log file
[out]	buf	the allocated buffer for read

Returns

DB_SUCCESS or error

log_file_header_read() [2/2]

dberr_t log_file_header_read	(	Log_file_handle &	file_handle,
		Log_file_header &	header
	)

Reads and deserializes the log file header.

Parameters

[in]	file_handle	handle for the opened log file
[out]	header	the file header read

Returns

DB_SUCCESS or error

log_file_header_reset_flag()

void log_file_header_reset_flag	(	Log_flags &	log_flags,
		uint32_t	bit
	)

Resets a specific flag in the mask built of redo log flags.

Parameters

[in]	log_flags	mask of log flags
[in]	bit	bit number to set (flag)

log_file_header_serialize()

void log_file_header_serialize	(	const Log_file_header &	header,
		byte *	buf
	)

Serializes the log file header to the buffer.

Parameters

[in]	header	the header to serialize
[out]	buf	the allocated buffer

log_file_header_set_flag()

void log_file_header_set_flag	(	Log_flags &	log_flags,
		uint32_t	bit
	)

Sets a specific flag in the mask built of redo log flags.

Parameters

[in]	log_flags	mask of log flags
[in]	bit	bit number to set (flag)

log_file_header_validate()

static void log_file_header_validate ( const Log_file_header &  header )

static

Asserts that the provided file header seems correct.

Parameters

[in]

header

file header data to validate

log_file_header_write() [1/2]

dberr_t log_file_header_write	(	Log_file_handle &	file_handle,
		const byte *	buf
	)

Writes the serialized log file header to the log file.

Parameters

[in]	file_handle	handle for the opened log file
[in]	buf	the serialized file header

Returns

DB_SUCCESS or error

log_file_header_write() [2/2]

dberr_t log_file_header_write	(	Log_file_handle &	file_handle,
		const Log_file_header &	header
	)

Serializes and writes the log file header to the log file.

Parameters

[in]	file_handle	handle for the opened log file
[in]	header	the file header

Returns

DB_SUCCESS or error

log_file_name()

std::string log_file_name	(	const Log_files_context &	ctx,
		Log_file_id	file_id
	)

Provides name of the log file with the given file id, e.g.

'ib_redo0'.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the log file

Returns

file name

log_file_path()

std::string log_file_path	(	const Log_files_context &	ctx,
		Log_file_id	file_id
	)

Provides full path to the log file, e.g.

'/data/innodb_redo/ib_redo2'.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the log file

Returns

path to the log file (including file name)

log_file_path_for_unused_file()

std::string log_file_path_for_unused_file	(	const Log_files_context &	ctx,
		Log_file_id	file_id
	)

Provides full path to the temporary log file, e.g.

'/data/innodb_redo/ib_redo2_tmp'.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the file

Returns

path to the temporary log file (including file name)

log_flush_directory_low()

static void log_flush_directory_low ( const std::string &  path )

static

Fsyncs the given directory.

Fails on assertion if the directory could not be opened.

Parameters

[in]

path

path to directory to fsync

log_generate_uuid()

Log_uuid log_generate_uuid

(

)

Generate unique identifier for the redo log files.

Returns

random uuid > 0

log_header_checksum_is_ok()

bool log_header_checksum_is_ok

(

const byte *

buf

)

Computes checksum of the given header and verifies if the checksum is the same as the one stored in that header.

Parameters

[in]

buf

header to verify

Returns

true iff checksums are the same

log_list_existing_files()

dberr_t log_list_existing_files	(	const Log_files_context &	ctx,
		ut::vector< Log_file_id > &	ret
	)

List existing log files in the directory (does not include unused files).

Parameters

[in]	ctx	context within which files exist
[out]	ret	identifiers of existing log files

Returns

DB_SUCCESS or DB_ERROR

log_list_existing_files_low()

static dberr_t log_list_existing_files_low ( const Log_files_context &  ctx, const char *  suffix, ut::vector< Log_file_id > &  ret  )

static

Lists existing redo files in the configured redo log directory, selecting redo log files which have a given suffix in their name.

Produces list of identifiers of the listed and selected files. If a system error occurs when listing the redo directory, error is emitted to the error log and DB_ERROR is returned.

Parameters

[in]	ctx	redo log files context
[in]	suffix	suffix used for the selection of files (could be "")
[out]	ret	identifiers of the listed and selected files

Returns

DB_SUCCESS or DB_ERROR

log_list_existing_unused_files()

dberr_t log_list_existing_unused_files	(	const Log_files_context &	ctx,
		ut::vector< Log_file_id > &	ret
	)

List existing unused log files in the directory.

Parameters

[in]	ctx	context within which files exist
[out]	ret	identifiers of existing unused log files

Returns

DB_SUCCESS or DB_ERROR

log_mark_file_as_in_use()

dberr_t log_mark_file_as_in_use	(	const Log_files_context &	ctx,
		Log_file_id	file_id
	)

Renames a temporary log file to the non-temporary log file.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the file to rename

Returns

DB_SUCCESS or DB_ERROR

log_mark_file_as_unused()

dberr_t log_mark_file_as_unused	(	const Log_files_context &	ctx,
		Log_file_id	file_id
	)

Renames a non-temporary log file to the temporary log file.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the file to rename

Returns

DB_SUCCESS or DB_ERROR

log_remove_file() [1/2]

std::pair< dberr_t, Log_file_id > log_remove_file

(

const Log_files_context &

ctx

)

Removes a single existing log file (if it existed).

Parameters

[in]

ctx

context within which files exist

Returns

first: DB_SUCCESS, DB_NOT_FOUND or DB_ERROR second: id of the removed file (if removed)

log_remove_file() [2/2]

dberr_t log_remove_file	(	const Log_files_context &	ctx,
		Log_file_id	file_id
	)

Removes a log file, if it existed.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the file to remove

Returns

DB_SUCCESS, DB_NOT_FOUND or DB_ERROR

log_remove_file_low()

static dberr_t log_remove_file_low ( const Log_files_context &  context, const std::string &  file_path, int  err_msg_id  )

static

Delete the log file at the provided file path.

Asserts that the file has been deleted or does not exist.

Parameters

[in]	context	redo log files context
[in]	file_path	path to the log file that should be removed
[in]	err_msg_id	id of the error message to print (if needed)

Returns

DB_SUCCESS, DB_NOT_FOUND or DB_ERROR

log_remove_files()

std::pair< dberr_t, ut::vector< Log_file_id > > log_remove_files

(

const Log_files_context &

ctx

)

Removes existing log files.

When failed to remove a file, stops and returns error. In such case the last element of the returned identifiers of files, represents the file for which error has been encountered when trying to remove it.

Parameters

[in]

ctx

context within which files exist

Returns

first: DB_SUCCESS or DB_ERROR second: identifiers of files for which remove has been called

log_remove_unused_file()

dberr_t log_remove_unused_file	(	const Log_files_context &	ctx,
		Log_file_id	file_id
	)

Removes a temporary log file, if it existed.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the file to remove

Returns

DB_SUCCESS, DB_NOT_FOUND or DB_ERROR

log_remove_unused_files()

std::pair< dberr_t, ut::vector< Log_file_id > > log_remove_unused_files

(

const Log_files_context &

ctx

)

Removes all temporary log files in the directory.

When failed to remove a file, stops and returns error. In such case the last element of the returned identifiers of files, represents the file for which error has been encountered when trying to remove it.

Parameters

[in]

ctx

context within which files exist

Returns

first: DB_SUCCESS or DB_ERROR second: identifiers of files for which remove has been called

log_rename_file_low()

static dberr_t log_rename_file_low ( const Log_files_context &  context, const std::string &  old_file_path, const std::string &  new_file_path, int  err_msg_id  )

static

Renames the log file.

Parameters

[in]	context	redo log files context
[in]	old_file_path	path to the existing log file to rename
[in]	new_file_path	path to the renamed file
[in]	err_msg_id	id of the error message to print (if needed)

Returns

DB_SUCCESS or DB_ERROR

log_rename_unused_file()

dberr_t log_rename_unused_file	(	const Log_files_context &	ctx,
		Log_file_id	old_unused_file_id,
		Log_file_id	new_unused_file_id
	)

Renames the unused file to another unused file.

Parameters

[in]	ctx	context within which files exist
[in]	old_unused_file_id	id of file to rename
[in]	new_unused_file_id	new file id

Returns

DB_SUCCESS or DB_ERROR

log_resize_file()

dberr_t log_resize_file	(	const Log_files_context &	ctx,
		Log_file_id	file_id,
		os_offset_t	size_in_bytes
	)

Resizes an existing log file to the given size.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the file to resize
[in]	size_in_bytes	requested size of the file, in bytes

Returns

DB_SUCCESS, DB_NOT_FOUND, DB_OUT_OF_DISK_SPACE or DB_ERROR

log_resize_file_low()

static dberr_t log_resize_file_low ( const std::string &  file_path, os_offset_t  size_in_bytes, int  err_msg_id  )

static

Resizes the log file at the provided file path.

Parameters

[in]	file_path	path to the log file that should be resized
[in]	size_in_bytes	size to which resize, in bytes
[in]	err_msg_id	id of the error message to print (if needed)

Returns

DB_SUCCESS, DB_NOT_FOUND, DB_OUT_OF_DISK_SPACE or DB_ERROR

log_resize_unused_file()

dberr_t log_resize_unused_file	(	const Log_files_context &	ctx,
		Log_file_id	file_id,
		os_offset_t	size_in_bytes
	)

Resizes an existing temporary log file to the given size.

Parameters

[in]	ctx	context within which files exist
[in]	file_id	id of the file to resize
[in]	size_in_bytes	requested size of the file, in bytes

Returns

DB_SUCCESS, DB_NOT_FOUND, DB_OUT_OF_DISK_SPACE or DB_ERROR

Variable Documentation

log_checksum_algorithm_ptr

Log_checksum_algorithm_atomic_ptr log_checksum_algorithm_ptr

Atomic pointer to the log checksum calculation function.

This is actually the only remaining "state" of the library. Hopefully can become removed.