Added .cpp and .h files under the sql/src subdirectory
git-svn-id: https://svn.code.sf.net/p/flaim/code/trunk@469 0109f412-320b-0410-ab79-c3e0c5ffbbe6
This commit is contained in:
dsandersoremutah
503
sql/src/fslfile.cpp
Normal file
503
sql/src/fslfile.cpp
Normal file
@@ -0,0 +1,503 @@
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//------------------------------------------------------------------------------
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// Desc: Routines for reading and writing logical file headers.
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//
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// Tabs: 3
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//
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// Copyright (c) 1991-2006 Novell, Inc. All Rights Reserved.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the GNU General Public
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// License as published by the Free Software Foundation.
|
||||
//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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||||
// GNU General Public License for more details.
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||||
//
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||||
// You should have received a copy of the GNU General Public License
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||||
// along with this program; if not, contact Novell, Inc.
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//
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// To contact Novell about this file by physical or electronic mail,
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||||
// you may find current contact information at www.novell.com
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//
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// $Id: fslfile.cpp 3114 2006-01-19 13:22:45 -0700 (Thu, 19 Jan 2006) dsanders $
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//------------------------------------------------------------------------------
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#include "flaimsys.h"
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FSTATIC FLMUINT FSLFileFindEmpty(
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FLMUINT uiBlockSize,
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F_BLK_HDR * pBlkHdr);
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/***************************************************************************
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Desc: Searches a block for an empty LFH slot. This is called whenever
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a new logical file is create so we re-use the slots.
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Ret: 0-Empty slot not found
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non-zero - offset in the block of the empty slot
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***************************************************************************/
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FSTATIC FLMUINT FSLFileFindEmpty(
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FLMUINT uiBlockSize,
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F_BLK_HDR * pBlkHdr)
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{
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FLMUINT uiPos = SIZEOF_STD_BLK_HDR;
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FLMUINT uiEndPos = blkGetEnd( uiBlockSize, SIZEOF_STD_BLK_HDR,
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pBlkHdr);
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F_LF_HDR * pLfHdr = (F_LF_HDR *)((FLMBYTE *)pBlkHdr + SIZEOF_STD_BLK_HDR);
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while (uiPos < uiEndPos)
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{
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if (pLfHdr->ui32LfType == (FLMUINT32)SFLM_LF_INVALID)
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{
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break;
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}
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uiPos += sizeof( F_LF_HDR);
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pLfHdr++;
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}
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return( (uiPos < uiEndPos) ? uiPos : 0);
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}
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/***************************************************************************
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Desc: Retrieves the logical file header record from disk & updates LFILE.
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Called when it is discovered that the LFH for a
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particular logical file is out of date.
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*****************************************************************************/
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RCODE F_Database::lFileRead(
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F_Db * pDb,
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LFILE * pLFile)
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{
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RCODE rc = NE_SFLM_OK;
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F_CachedBlock * pSCache;
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FLMBOOL bReleaseCache = FALSE;
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// Read in the block containing the logical file header
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if (RC_BAD( rc = getBlock( pDb, NULL,
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pLFile->uiBlkAddress, NULL, &pSCache)))
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{
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goto Exit;
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}
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bReleaseCache = TRUE;
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// Copy the LFH from the block to the LFILE
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FSLFileIn( (FLMBYTE *)(pSCache->m_pBlkHdr) + pLFile->uiOffsetInBlk,
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pLFile, pLFile->uiBlkAddress, pLFile->uiOffsetInBlk);
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Exit:
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if (bReleaseCache)
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{
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ScaReleaseCache( pSCache, FALSE);
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}
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return( rc);
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}
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/***************************************************************************
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Desc: Update the LFH data on disk.
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*****************************************************************************/
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RCODE F_Database::lFileWrite(
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F_Db * pDb,
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LFILE * pLFile)
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{
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RCODE rc = NE_SFLM_OK;
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F_CachedBlock * pSCache;
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FLMBOOL bReleaseCache = FALSE;
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F_LF_HDR * pLfHdr;
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#ifdef DEBUG
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F_CachedBlock * pTmpSCache = NULL;
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#endif
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flmAssert( !pDb->m_pDatabase->m_pRfl ||
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!pDb->m_pDatabase->m_pRfl->isLoggingEnabled());
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// Read in the block containing the logical file header
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if (RC_BAD( rc = getBlock( pDb, NULL,
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pLFile->uiBlkAddress, NULL, &pSCache)))
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{
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goto Exit;
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}
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bReleaseCache = TRUE;
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// Log the block before modifying it
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if (RC_BAD( rc = logPhysBlk( pDb, &pSCache)))
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{
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goto Exit;
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}
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// Now modify the block and set its status to dirty
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pLfHdr = (F_LF_HDR *)((FLMBYTE *)(pSCache->m_pBlkHdr) +
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pLFile->uiOffsetInBlk);
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// If deleted, fill with 0, except for type - it is set below
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if (pLFile->eLfType == SFLM_LF_INVALID)
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{
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f_memset( pLfHdr, 0, sizeof( F_LF_HDR));
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pLfHdr->ui32LfType = (FLMUINT32)SFLM_LF_INVALID;
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}
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else
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{
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#ifdef DEBUG
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if (RC_BAD( rc = getBlock( pDb, NULL,
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pLFile->uiRootBlk, NULL, &pTmpSCache)))
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{
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goto Exit;
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}
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if (!isRootBlk( (F_BTREE_BLK_HDR *)pTmpSCache->m_pBlkHdr))
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{
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rc = RC_SET_AND_ASSERT( NE_SFLM_DATA_ERROR);
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}
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#endif
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pLfHdr->ui32LfType = (FLMUINT32)pLFile->eLfType;
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pLfHdr->ui32RootBlkAddr = (FLMUINT32)pLFile->uiRootBlk;
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pLfHdr->ui32LfNum = (FLMUINT32)pLFile->uiLfNum;
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pLfHdr->ui32EncDefNum = (FLMUINT32)pLFile->uiEncDefNum;
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if (pLFile->eLfType == SFLM_LF_TABLE)
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{
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pLfHdr->ui64NextRowId = pLFile->ui64NextRowId;
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}
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else
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{
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flmAssert( pLFile->eLfType == SFLM_LF_INDEX);
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pLfHdr->ui64NextRowId = 0;
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}
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}
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pLFile->bNeedToWriteOut = FALSE;
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// If the LFILE was deleted, we need to set pLFile->uiLfNum to zero.
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// This should happen only AFTER the LFILE update is logged, because
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// logLFileUpdate relies on pLFile->uiLfNum being non-zero.
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if (pLFile->eLfType == SFLM_LF_INVALID)
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{
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pLFile->uiLfNum = 0;
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}
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Exit:
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if (bReleaseCache)
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{
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ScaReleaseCache( pSCache, FALSE);
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}
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||||
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||||
#ifdef DEBUG
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if (pTmpSCache)
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{
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ScaReleaseCache( pTmpSCache, FALSE);
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}
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#endif
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return( rc);
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}
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/***************************************************************************
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Desc: Creates and initializes a LFILE structure on disk and in memory.
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*****************************************************************************/
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RCODE F_Database::lFileCreate(
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F_Db * pDb,
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LFILE * pLFile,
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FLMUINT uiLfNum,
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eLFileType eLfType,
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FLMBOOL bCounts,
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FLMBOOL bHaveData,
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FLMUINT uiEncDefNum)
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{
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RCODE rc = NE_SFLM_OK;
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F_CachedBlock * pNewSCache = NULL;
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F_CachedBlock * pSCache = NULL;
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F_BLK_HDR * pBlkHdr = NULL;
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FLMUINT uiBlkAddress = 0;
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FLMUINT uiNextBlkAddress;
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FLMUINT uiEndPos = 0;
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FLMUINT uiPos = 0;
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FLMBOOL bReleaseCache2 = FALSE;
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FLMBOOL bReleaseCache = FALSE;
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F_Btree * pbTree = NULL;
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flmAssert( !pDb->m_pDatabase->m_pRfl ||
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!pDb->m_pDatabase->m_pRfl->isLoggingEnabled());
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if (eLfType == SFLM_LF_TABLE)
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{
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if( bCounts)
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{
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// Force bCounts to be FALSE in this case
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flmAssert( 0);
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bCounts = FALSE;
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}
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if( !bHaveData)
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{
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// Force bHaveData to be TRUE in this case
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flmAssert( 0);
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bHaveData = TRUE;
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}
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}
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// Find an available slot to create the LFH -- follow the linked list
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// of LFH blocks to find one.
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uiNextBlkAddress = (FLMUINT)m_uncommittedDbHdr.ui32FirstLFBlkAddr;
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// Better be at least one LFH block.
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if (uiNextBlkAddress == 0)
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{
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rc = RC_SET( NE_SFLM_DATA_ERROR);
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||||
goto Exit;
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||||
}
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||||
while (uiNextBlkAddress != 0)
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{
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||||
if (bReleaseCache)
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{
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ScaReleaseCache( pSCache, FALSE);
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bReleaseCache = FALSE;
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||||
}
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||||
uiBlkAddress = uiNextBlkAddress;
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||||
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if (RC_BAD( rc = getBlock( pDb, NULL,
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||||
uiBlkAddress, NULL, &pSCache)))
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||||
{
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||||
goto Exit;
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||||
}
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||||
bReleaseCache = TRUE;
|
||||
|
||||
pBlkHdr = pSCache->m_pBlkHdr;
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||||
uiNextBlkAddress = (FLMUINT)pBlkHdr->ui32NextBlkInChain;
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uiEndPos = blkGetEnd( m_uiBlockSize, SIZEOF_STD_BLK_HDR, pBlkHdr);
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||||
if ((uiPos = FSLFileFindEmpty( m_uiBlockSize, pBlkHdr)) != 0)
|
||||
{
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||||
break;
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||||
}
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||||
}
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||||
// If we did not find a deleted slot we can use, see if there
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// is room for a new logical file in the last block
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// in the chain. If not, allocate a new block.
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||||
|
||||
if (uiPos == 0)
|
||||
{
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||||
uiEndPos = blkGetEnd( m_uiBlockSize, SIZEOF_STD_BLK_HDR, pBlkHdr);
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||||
|
||||
// Allocate new block?
|
||||
|
||||
if (uiEndPos + sizeof( F_LF_HDR) >= m_uiBlockSize)
|
||||
{
|
||||
if (RC_BAD( rc = createBlock( pDb, &pNewSCache)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
bReleaseCache2 = TRUE;
|
||||
|
||||
pBlkHdr = pNewSCache->m_pBlkHdr;
|
||||
uiNextBlkAddress = (FLMUINT)pBlkHdr->ui32BlkAddr;
|
||||
|
||||
// Modify the new block's next pointer and other fields.
|
||||
|
||||
pBlkHdr->ui32NextBlkInChain = 0;
|
||||
pBlkHdr->ui32PrevBlkInChain = (FLMUINT32)uiBlkAddress;
|
||||
pBlkHdr->ui8BlkType = BT_LFH_BLK;
|
||||
pBlkHdr->ui16BlkBytesAvail = (FLMUINT16)(m_uiBlockSize -
|
||||
SIZEOF_STD_BLK_HDR);
|
||||
|
||||
if (RC_BAD( rc = logPhysBlk( pDb, &pSCache)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
pSCache->m_pBlkHdr->ui32NextBlkInChain = (FLMUINT32)uiNextBlkAddress;
|
||||
|
||||
// Set everything up so we are pointing to the new block.
|
||||
|
||||
ScaReleaseCache( pSCache, FALSE);
|
||||
pSCache = pNewSCache;
|
||||
bReleaseCache2 = FALSE;
|
||||
uiEndPos = blkGetEnd( m_uiBlockSize, SIZEOF_STD_BLK_HDR,
|
||||
pSCache->m_pBlkHdr);
|
||||
uiBlkAddress = uiNextBlkAddress;
|
||||
}
|
||||
|
||||
// Modify the end of block pointer -- log block before modifying.
|
||||
|
||||
uiPos = uiEndPos;
|
||||
uiEndPos += sizeof( F_LF_HDR);
|
||||
}
|
||||
|
||||
// Call memset to ensure unused bytes are zero.
|
||||
// pBlkHdr, uiPos and uiEndPos should ALL be set.
|
||||
|
||||
if (RC_BAD( rc = logPhysBlk( pDb, &pSCache)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
pBlkHdr = pSCache->m_pBlkHdr;
|
||||
f_memset( (FLMBYTE *)(pBlkHdr) + uiPos, 0, sizeof( F_LF_HDR));
|
||||
flmAssert( uiEndPos >= SIZEOF_STD_BLK_HDR &&
|
||||
uiEndPos <= m_uiBlockSize);
|
||||
pBlkHdr->ui16BlkBytesAvail = (FLMUINT16)(m_uiBlockSize - uiEndPos);
|
||||
|
||||
// Done with block in this routine
|
||||
|
||||
ScaReleaseCache( pSCache, FALSE);
|
||||
bReleaseCache = FALSE;
|
||||
|
||||
// Set the variables in the LFILE structure to later save to disk
|
||||
|
||||
pLFile->uiLfNum = uiLfNum;
|
||||
pLFile->eLfType = eLfType;
|
||||
|
||||
// NOTE: call to btCreate below sets pLFile->uiRootBlk
|
||||
|
||||
// pLFile->uiRootBlk = 0;
|
||||
pLFile->uiBlkAddress = uiBlkAddress;
|
||||
pLFile->uiOffsetInBlk = uiPos;
|
||||
pLFile->uiEncDefNum = uiEncDefNum;
|
||||
if (eLfType == SFLM_LF_TABLE)
|
||||
{
|
||||
pLFile->ui64NextRowId = 1;
|
||||
pLFile->bNeedToWriteOut = TRUE;
|
||||
}
|
||||
else
|
||||
{
|
||||
pLFile->ui64NextRowId = 0;
|
||||
}
|
||||
|
||||
// Get the btree...
|
||||
if (RC_BAD( rc = gv_SFlmSysData.pBtPool->btpReserveBtree( &pbTree)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
if (RC_BAD( rc = pbTree->btCreate( pDb, pLFile, bCounts, bHaveData)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
if (RC_BAD( rc = lFileWrite( pDb, pLFile)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
Exit:
|
||||
|
||||
if (bReleaseCache)
|
||||
{
|
||||
ScaReleaseCache( pSCache, FALSE);
|
||||
}
|
||||
if (bReleaseCache2)
|
||||
{
|
||||
ScaReleaseCache( pNewSCache, FALSE);
|
||||
}
|
||||
if (pbTree)
|
||||
{
|
||||
gv_SFlmSysData.pBtPool->btpReturnBtree( &pbTree);
|
||||
}
|
||||
return( rc);
|
||||
}
|
||||
|
||||
/***************************************************************************
|
||||
Desc: Delete a logical file.
|
||||
*****************************************************************************/
|
||||
RCODE F_Database::lFileDelete(
|
||||
F_Db * pDb,
|
||||
LFILE * pLFile,
|
||||
FLMBOOL bCounts,
|
||||
FLMBOOL bHaveData)
|
||||
{
|
||||
RCODE rc = NE_SFLM_OK;
|
||||
F_Btree * pbTree = NULL;
|
||||
FLMUINT uiLoop;
|
||||
FLMUINT uiBlkChains[ BH_MAX_LEVELS];
|
||||
FLMUINT uiChainCount;
|
||||
F_Row * pRow = NULL;
|
||||
|
||||
flmAssert( pDb->m_uiFlags & FDB_UPDATED_DICTIONARY);
|
||||
|
||||
// Get a btree
|
||||
|
||||
if (RC_BAD( rc = gv_SFlmSysData.pBtPool->btpReserveBtree( &pbTree)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
// Delete the logical file's B-Tree blocks.
|
||||
// If there is no root block, no need to do anything.
|
||||
|
||||
flmAssert( pLFile->uiRootBlk);
|
||||
|
||||
if (RC_BAD( rc = pbTree->btOpen( pDb, pLFile, bCounts, bHaveData)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
if (RC_BAD( rc = pbTree->btGetBlockChains( uiBlkChains, &uiChainCount)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
// Indexes and tables are always deleted in the background.
|
||||
// Add a row to the block chain table for each chain found.
|
||||
|
||||
for (uiLoop = 0; uiLoop < uiChainCount; uiLoop++)
|
||||
{
|
||||
if (pRow)
|
||||
{
|
||||
pRow->ReleaseRow();
|
||||
pRow = NULL;
|
||||
}
|
||||
|
||||
// Create the row
|
||||
|
||||
if (RC_BAD( rc = gv_SFlmSysData.pRowCacheMgr->createRow( pDb,
|
||||
SFLM_TBLNUM_BLOCK_CHAINS, &pRow)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
// Set the block address column in the row.
|
||||
|
||||
if (RC_BAD( rc = pRow->setUINT( pDb,
|
||||
SFLM_COLNUM_BLOCK_CHAINS_BLOCK_ADDRESS,
|
||||
uiBlkChains [uiLoop])))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
}
|
||||
|
||||
// Signal the maintenance thread that it has work to do
|
||||
|
||||
f_semSignal( m_hMaintSem);
|
||||
|
||||
// Delete the LFILE entry.
|
||||
|
||||
pLFile->uiRootBlk = 0;
|
||||
pLFile->eLfType = SFLM_LF_INVALID;
|
||||
|
||||
if( RC_BAD( rc = lFileWrite( pDb, pLFile)))
|
||||
{
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
Exit:
|
||||
|
||||
if (pRow)
|
||||
{
|
||||
pRow->ReleaseRow();
|
||||
}
|
||||
if( pbTree)
|
||||
{
|
||||
gv_SFlmSysData.pBtPool->btpReturnBtree( &pbTree);
|
||||
}
|
||||
|
||||
return( rc);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user