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/*****************************************************************************
Copyright (C) 2013, 2017, MariaDB Corporation. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/******************************************************************//**
@file include/fsp0pagecompress.ic
Implementation for helper functions for extracting/storing page
compression and atomic writes information to file space.
Created 11/12/2013 Jan Lindström jan.lindstrom@mariadb.com
***********************************************************************/
/********************************************************************//**
Determine the tablespace is page compression level from dict_table_t::flags.
@return page compression level or 0 if not compressed*/
UNIV_INLINE
ulint
fsp_flags_get_page_compression_level(
/*=================================*/
ulint flags) /*!< in: tablespace flags */
{
return(FSP_FLAGS_GET_PAGE_COMPRESSION_LEVEL(flags));
}
/*******************************************************************//**
Find out wheather the page is index page or not
@return true if page type index page, false if not */
UNIV_INLINE
bool
fil_page_is_index_page(
/*===================*/
byte* buf) /*!< in: page */
{
return(mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_INDEX);
}
/*******************************************************************//**
Find out wheather the page is page compressed
@return true if page is page compressed, false if not */
UNIV_INLINE
bool
fil_page_is_compressed(
/*===================*/
const byte* buf) /*!< in: page */
{
return(mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_PAGE_COMPRESSED);
}
/*******************************************************************//**
Find out wheather the page is page compressed
@return true if page is page compressed, false if not */
UNIV_INLINE
bool
fil_page_is_compressed_encrypted(
/*=============================*/
const byte* buf) /*!< in: page */
{
return(mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED);
}
#ifndef UNIV_INNOCHECKSUM
/*******************************************************************//**
Returns the page compression level of the space, or 0 if the space
is not compressed. The tablespace must be cached in the memory cache.
@return page compression level, 0 if space not found */
UNIV_INLINE
ulint
fil_space_get_page_compression_level(
/*=================================*/
ulint id) /*!< in: space id */
{
ulint flags;
flags = fil_space_get_flags(id);
if (flags && flags != ULINT_UNDEFINED) {
return(fsp_flags_get_page_compression_level(flags));
}
return(0);
}
/*******************************************************************//**
Extract the page compression from space.
@return true if space is page compressed, false if space is not found
or space is not page compressed. */
UNIV_INLINE
bool
fil_space_is_page_compressed(
/*=========================*/
ulint id) /*!< in: space id */
{
ulint flags = fil_space_get_flags(id);
return(flags != ULINT_UNDEFINED
&& FSP_FLAGS_HAS_PAGE_COMPRESSION(flags));
}
#endif /* UNIV_INNOCHECKSUM */
/****************************************************************//**
Get the name of the compression algorithm used for page
compression.
@return compression algorithm name or "UNKNOWN" if not known*/
UNIV_INLINE
const char*
fil_get_compression_alg_name(
/*=========================*/
ulint comp_alg) /*!<in: compression algorithm number */
{
switch(comp_alg) {
case PAGE_UNCOMPRESSED:
return ("uncompressed");
break;
case PAGE_ZLIB_ALGORITHM:
return ("ZLIB");
break;
case PAGE_LZ4_ALGORITHM:
return ("LZ4");
break;
case PAGE_LZO_ALGORITHM:
return ("LZO");
break;
case PAGE_LZMA_ALGORITHM:
return ("LZMA");
break;
case PAGE_BZIP2_ALGORITHM:
return ("BZIP2");
break;
case PAGE_SNAPPY_ALGORITHM:
return ("SNAPPY");
break;
/* No default to get compiler warning */
}
return ("NULL");
}
#ifndef UNIV_INNOCHECKSUM
/*******************************************************************//**
Returns the atomic writes flag of the space, or false if the space
is not using atomic writes. The tablespace must be cached in the memory cache.
@return 1 if atomic writes can be used for the file */
UNIV_INLINE
bool
fil_space_get_atomic_writes(
/*========================*/
ulint id) /*!< in: space id */
{
struct fil_space_t* space;
bool ret= 0;
ut_ad(fil_system);
mutex_enter(&fil_system->mutex);
if ((space = fil_space_get_by_id(id)))
ret= space->atomic_write_supported;
mutex_exit(&fil_system->mutex);
return(ret);
}
/*******************************************************************//**
Find out wheather the page is page compressed with lzo method
@return true if page is page compressed with lzo method, false if not */
UNIV_INLINE
bool
fil_page_is_lzo_compressed(
/*=======================*/
byte* buf) /*!< in: page */
{
return((mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_PAGE_COMPRESSED &&
mach_read_from_8(buf+FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION) == PAGE_LZO_ALGORITHM) ||
(mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED &&
mach_read_from_2(buf+FIL_PAGE_DATA+FIL_PAGE_COMPRESSED_SIZE) == PAGE_LZO_ALGORITHM));
}
#endif /* UNIV_INNOCHECKSUM */
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