91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
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/****************************************************************
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* *
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* Copyright 2005, 2009 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "gtm_string.h"
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#include "gdsroot.h"
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#include "gdskill.h"
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#include "gdsblk.h"
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#include "gtm_facility.h"
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#include "fileinfo.h"
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#include "gdsbt.h"
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#include "gdsfhead.h"
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#include "gdsbml.h"
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#include "gvcst_lbm_check.h"
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/* Routines for checking status of database blocks using a given local bitmap */
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/* There are two bits that denote the status of a block in the local bitmap:
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0b00 busy
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0b01 free
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0b10 invalid
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0b11 recycled (but free)
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The low order bit can be used to denote busy or free so that is what
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is actually tested.
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Inputs: 1) pointer to local bit map data (blk_ptr + SIZEOF(blk_hdr)).
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2) bit offset to test into bitmap.
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*/
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boolean_t gvcst_blk_is_allocated(uchar_ptr_t lbmap, int lm_offset)
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{
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int uchar_offset, uchar_offset_rem;
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unsigned char result_byte;
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uchar_ptr_t map_byte;
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assert(BLKS_PER_LMAP * BML_BITS_PER_BLK > lm_offset);
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uchar_offset = lm_offset / BITS_PER_UCHAR;
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uchar_offset_rem = lm_offset % BITS_PER_UCHAR;
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map_byte = lbmap + uchar_offset;
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result_byte = (*map_byte >> uchar_offset_rem) & 0x3;
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switch(result_byte)
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{
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case 0x00:
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return TRUE;
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case 0x01:
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case 0x03:
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return FALSE;
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default:
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GTMASSERT;
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}
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return FALSE; /* Can't get here but keep compiler happy */
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}
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/* Similarly this routine tells if the block was EVER allocated (allocated or recycled) */
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boolean_t gvcst_blk_ever_allocated(uchar_ptr_t lbmap, int lm_offset)
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{
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int uchar_offset, uchar_offset_rem;
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unsigned char result_byte;
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uchar_ptr_t map_byte;
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assert(BLKS_PER_LMAP * BML_BITS_PER_BLK > lm_offset);
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uchar_offset = lm_offset / BITS_PER_UCHAR;
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uchar_offset_rem = lm_offset % BITS_PER_UCHAR;
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map_byte = lbmap + uchar_offset;
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result_byte = (*map_byte >> uchar_offset_rem) & 0x3;
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switch(result_byte)
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{
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case 0x00:
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case 0x03:
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return TRUE;
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case 0x01:
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return FALSE;
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default:
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GTMASSERT;
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}
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return FALSE; /* Can't get here but keep compiler happy */
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}
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