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/*****************************************************************************
Copyright (c) 1995, 2011, Oracle and/or its affiliates. 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 Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/fsp0fsp.ic
File space management
Created 12/18/1995 Heikki Tuuri
*******************************************************/
/***********************************************************************//**
Checks if a page address is an extent descriptor page address.
@return TRUE if a descriptor page */
UNIV_INLINE
ibool
fsp_descr_page(
/*===========*/
ulint zip_size,/*!< in: compressed page size in bytes;
0 for uncompressed pages */
ulint page_no)/*!< in: page number */
{
ut_ad(ut_is_2pow(zip_size));
if (!zip_size) {
return(UNIV_UNLIKELY((page_no & (UNIV_PAGE_SIZE - 1))
== FSP_XDES_OFFSET));
}
return(UNIV_UNLIKELY((page_no & (zip_size - 1)) == FSP_XDES_OFFSET));
}
/********************************************************************//**
Extract the page size from tablespace flags.
This feature, storing the page_ssize into the tablespace flags, is added
to InnoDB 5.6.4. This is here only to protect against a crash if a newer
database is opened with this code branch.
@return page size of the tablespace in bytes */
UNIV_INLINE
ulint
fsp_flags_get_page_size(
/*====================*/
ulint flags) /*!< in: tablespace flags */
{
ulint page_size = 0;
ulint ssize = FSP_FLAGS_GET_PAGE_SSIZE(flags);
/* Convert from a 'log2 minus 9' to a page size in bytes. */
if (UNIV_UNLIKELY(ssize)) {
page_size = (512 << ssize);
ut_ad(page_size <= UNIV_PAGE_SIZE);
} else {
/* If the page size was not stored, then it is the
original 16k. */
page_size = UNIV_PAGE_SIZE;
}
return(page_size);
}
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