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48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
/*****************************************************************************
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Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2013, 2019, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/fsp0fsp.ic
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File space management
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Created 12/18/1995 Heikki Tuuri
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*******************************************************/
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/**********************************************************************//**
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Gets a descriptor bit of a page.
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@return TRUE if free */
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UNIV_INLINE
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ibool
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xdes_get_bit(
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/*=========*/
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const xdes_t* descr, /*!< in: descriptor */
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ulint bit, /*!< in: XDES_FREE_BIT or XDES_CLEAN_BIT */
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ulint offset) /*!< in: page offset within extent:
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0 ... FSP_EXTENT_SIZE - 1 */
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{
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ut_ad(offset < FSP_EXTENT_SIZE);
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ut_ad(bit == XDES_FREE_BIT || bit == XDES_CLEAN_BIT);
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ulint index = bit + XDES_BITS_PER_PAGE * offset;
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ulint bit_index = index % 8;
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ulint byte_index = index / 8;
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return ut_bit_get_nth(descr[XDES_BITMAP + byte_index], bit_index);
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}
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