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Star 22016
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TDengine
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未验证 提交 3d7eb520 编写于 作者: S Shengliang Guan 提交者： GitHub
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Merge pull request #16653 from taosdata/refact/tsdb_new_format 

refact: new file format
上级 91bbca0b 8f894315
展开全部 隐藏空白更改
内联 并排
Showing with 991 addition and 1228 deletion
source/dnode/vnode/src/inc/tsdb.h
浏览文件 @ 3d7eb520
......@@ -65,12 +65,14 @@ typedef struct SBlockInfo SBlockInfo;
typedef struct SSmaInfo SSmaInfo;
typedef struct SBlockCol SBlockCol;
typedef struct SVersionRange SVersionRange;
typedef struct SLDataIter SLDataIter;
#define TSDB_FILE_DLMT ((uint32_t)0xF00AFA0F)
#define TSDB_MAX_SUBBLOCKS 8
#define TSDB_MAX_LAST_FILE 16
#define TSDB_DEFAULT_LAST_FILE 8
#define TSDB_MAX_SST_FILE 16
#define TSDB_DEFAULT_SST_FILE 8
#define TSDB_FHDR_SIZE 512
#define TSDB_DEFAULT_PAGE_SIZE 4096
#define HAS_NONE ((int8_t)0x1)
#define HAS_NULL ((int8_t)0x2)
......@@ -82,6 +84,14 @@ typedef struct SVersionRange SVersionRange;
#define TSDBKEY_MIN ((TSDBKEY){.ts = TSKEY_MIN, .version = VERSION_MIN})
#define TSDBKEY_MAX ((TSDBKEY){.ts = TSKEY_MAX, .version = VERSION_MAX})
#define PAGE_CONTENT_SIZE(PAGE) ((PAGE) - sizeof(TSCKSUM))
#define LOGIC_TO_FILE_OFFSET(LOFFSET, PAGE) \
((LOFFSET) / PAGE_CONTENT_SIZE(PAGE) * (PAGE) + (LOFFSET) % PAGE_CONTENT_SIZE(PAGE))
#define FILE_TO_LOGIC_OFFSET(OFFSET, PAGE) ((OFFSET) / (PAGE)*PAGE_CONTENT_SIZE(PAGE) + (OFFSET) % (PAGE))
#define PAGE_OFFSET(PGNO, PAGE) (((PGNO)-1) * (PAGE))
#define OFFSET_PGNO(OFFSET, PAGE) ((OFFSET) / (PAGE) + 1)
#define LOGIC_TO_FILE_SIZE(LSIZE, PAGE) OFFSET_PGNO(LOGIC_TO_FILE_OFFSET(LSIZE, PAGE), PAGE) * (PAGE)
// tsdbUtil.c ==============================================================================================
// TSDBROW
#define TSDBROW_TS(ROW) (((ROW)->type == 0) ? (ROW)->pTSRow->ts : (ROW)->pBlockData->aTSKEY[(ROW)->iRow])
......@@ -195,7 +205,6 @@ int32_t tsdbCmprColData(SColData *pColData, int8_t cmprAlg, SBlockCol *pBlockCol
uint8_t **ppBuf);
int32_t tsdbDecmprColData(uint8_t *pIn, SBlockCol *pBlockCol, int8_t cmprAlg, int32_t nVal, SColData *pColData,
uint8_t **ppBuf);
int32_t tsdbReadAndCheck(TdFilePtr pFD, int64_t offset, uint8_t **ppOut, int32_t size, int8_t toCheck);
// tsdbMemTable ==============================================================================================
// SMemTable
int32_t tsdbMemTableCreate(STsdb *pTsdb, SMemTable **ppMemTable);
......@@ -563,7 +572,7 @@ struct SDFileSet {
SDataFile *pDataF;
SSmaFile *pSmaF;
uint8_t nSstF;
SSstFile *aSstF[TSDB_MAX_LAST_FILE];
SSstFile *aSstF[TSDB_MAX_SST_FILE];
};
struct SRowIter {
......@@ -578,46 +587,54 @@ struct SRowMerger {
SArray *pArray; // SArray<SColVal>
};
struct SDelFWriter {
STsdb *pTsdb;
SDelFile fDel;
TdFilePtr pWriteH;
typedef struct {
char *path;
int32_t szPage;
int32_t flag;
TdFilePtr pFD;
int64_t pgno;
uint8_t *pBuf;
int64_t szFile;
} STsdbFD;
struct SDelFWriter {
STsdb *pTsdb;
SDelFile fDel;
STsdbFD *pWriteH;
uint8_t *aBuf[1];
};
struct STsdbReadSnap {
SMemTable *pMem;
SMemTable *pIMem;
STsdbFS fs;
};
struct SDataFWriter {
STsdb *pTsdb;
SDFileSet wSet;
TdFilePtr pHeadFD;
TdFilePtr pDataFD;
TdFilePtr pSmaFD;
TdFilePtr pLastFD;
STsdbFD *pHeadFD;
STsdbFD *pDataFD;
STsdbFD *pSmaFD;
STsdbFD *pSstFD;
SHeadFile fHead;
SDataFile fData;
SSmaFile fSma;
SSstFile fSst[TSDB_MAX_LAST_FILE];
SSstFile fSst[TSDB_MAX_SST_FILE];
uint8_t *aBuf[4];
};
struct STsdbReadSnap {
SMemTable *pMem;
SMemTable *pIMem;
STsdbFS fs;
};
struct SDataFReader {
STsdb *pTsdb;
SDFileSet *pSet;
TdFilePtr pHeadFD;
TdFilePtr pDataFD;
TdFilePtr pSmaFD;
TdFilePtr aLastFD[TSDB_MAX_LAST_FILE];
uint8_t *aBuf[3];
STsdbFD *pHeadFD;
STsdbFD *pDataFD;
STsdbFD *pSmaFD;
STsdbFD *aSstFD[TSDB_MAX_SST_FILE];
uint8_t *aBuf[3];
};
typedef struct {
......@@ -627,15 +644,16 @@ typedef struct {
} SRowInfo;
typedef struct SMergeTree {
int8_t backward;
SRBTree rbt;
SArray *pIterList;
struct SLDataIter *pIter;
int8_t backward;
SRBTree rbt;
SArray *pIterList;
SLDataIter *pIter;
} SMergeTree;
int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader* pFReader, uint64_t uid, STimeWindow* pTimeWindow, SVersionRange* pVerRange);
void tMergeTreeAddIter(SMergeTree *pMTree, struct SLDataIter *pIter);
bool tMergeTreeNext(SMergeTree *pMTree);
int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader *pFReader, uint64_t uid,
STimeWindow *pTimeWindow, SVersionRange *pVerRange);
void tMergeTreeAddIter(SMergeTree *pMTree, SLDataIter *pIter);
bool tMergeTreeNext(SMergeTree *pMTree);
TSDBROW tMergeTreeGetRow(SMergeTree *pMTree);
void tMergeTreeClose(SMergeTree *pMTree);
......
source/dnode/vnode/src/tsdb/tsdbCommit.c
浏览文件 @ 3d7eb520
......@@ -71,7 +71,7 @@ typedef struct {
SDataIter *pIter;
SRBTree rbt;
SDataIter dataIter;
SDataIter aDataIter[TSDB_MAX_LAST_FILE];
SDataIter aDataIter[TSDB_MAX_SST_FILE];
int8_t toLastOnly;
};
struct {
......@@ -92,9 +92,6 @@ typedef struct {
SArray *aDelData; // SArray<SDelData>
} SCommitter;
extern int32_t tsdbReadSstBlockEx(SDataFReader *pReader, int32_t iSst, SSstBlk *aSstBlk,
SBlockData *pBlockData); // todo
static int32_t tsdbStartCommit(STsdb *pTsdb, SCommitter *pCommitter);
static int32_t tsdbCommitData(SCommitter *pCommitter);
static int32_t tsdbCommitDel(SCommitter *pCommitter);
......@@ -445,7 +442,7 @@ static int32_t tsdbOpenCommitIter(SCommitter *pCommitter) {
pIter->iSstBlk = 0;
SSstBlk *pSstBlk = (SSstBlk *)taosArrayGet(pIter->aSstBlk, 0);
code = tsdbReadSstBlockEx(pCommitter->dReader.pReader, iSst, pSstBlk, &pIter->bData);
code = tsdbReadSstBlock(pCommitter->dReader.pReader, iSst, pSstBlk, &pIter->bData);
if (code) goto _err;
pIter->iRow = 0;
......@@ -760,7 +757,7 @@ static int32_t tsdbStartCommit(STsdb *pTsdb, SCommitter *pCommitter) {
pCommitter->minRow = pTsdb->pVnode->config.tsdbCfg.minRows;
pCommitter->maxRow = pTsdb->pVnode->config.tsdbCfg.maxRows;
pCommitter->cmprAlg = pTsdb->pVnode->config.tsdbCfg.compression;
pCommitter->maxLast = TSDB_DEFAULT_LAST_FILE; // TODO: make it as a config
pCommitter->maxLast = TSDB_DEFAULT_SST_FILE; // TODO: make it as a config
pCommitter->aTbDataP = tsdbMemTableGetTbDataArray(pTsdb->imem);
if (pCommitter->aTbDataP == NULL) {
code = TSDB_CODE_OUT_OF_MEMORY;
......@@ -790,7 +787,7 @@ static int32_t tsdbCommitDataStart(SCommitter *pCommitter) {
if (code) goto _exit;
// merger
for (int32_t iSst = 0; iSst < TSDB_MAX_LAST_FILE; iSst++) {
for (int32_t iSst = 0; iSst < TSDB_MAX_SST_FILE; iSst++) {
SDataIter *pIter = &pCommitter->aDataIter[iSst];
pIter->aSstBlk = taosArrayInit(0, sizeof(SSstBlk));
if (pIter->aSstBlk == NULL) {
......@@ -832,7 +829,7 @@ static void tsdbCommitDataEnd(SCommitter *pCommitter) {
tBlockDataDestroy(&pCommitter->dReader.bData, 1);
// merger
for (int32_t iSst = 0; iSst < TSDB_MAX_LAST_FILE; iSst++) {
for (int32_t iSst = 0; iSst < TSDB_MAX_SST_FILE; iSst++) {
SDataIter *pIter = &pCommitter->aDataIter[iSst];
taosArrayDestroy(pIter->aSstBlk);
tBlockDataDestroy(&pIter->bData, 1);
......@@ -1059,7 +1056,7 @@ static int32_t tsdbNextCommitRow(SCommitter *pCommitter) {
if (pIter->iSstBlk < taosArrayGetSize(pIter->aSstBlk)) {
SSstBlk *pSstBlk = (SSstBlk *)taosArrayGet(pIter->aSstBlk, pIter->iSstBlk);
code = tsdbReadSstBlockEx(pCommitter->dReader.pReader, pIter->iSst, pSstBlk, &pIter->bData);
code = tsdbReadSstBlock(pCommitter->dReader.pReader, pIter->iSst, pSstBlk, &pIter->bData);
if (code) goto _exit;
pIter->iRow = 0;
......
source/dnode/vnode/src/tsdb/tsdbFS.c
浏览文件 @ 3d7eb520
......@@ -21,6 +21,9 @@ static int32_t tsdbEncodeFS(uint8_t *p, STsdbFS *pFS) {
int8_t hasDel = pFS->pDelFile ? 1 : 0;
uint32_t nSet = taosArrayGetSize(pFS->aDFileSet);
// version
n += tPutI8(p ? p + n : p, 0);
// SDelFile
n += tPutI8(p ? p + n : p, hasDel);
if (hasDel) {
......@@ -292,7 +295,7 @@ static int32_t tsdbScanAndTryFixFS(STsdb *pTsdb) {
code = TAOS_SYSTEM_ERROR(errno);
goto _err;
}
if (size != pSet->pHeadF->size) {
if (size != LOGIC_TO_FILE_SIZE(pSet->pHeadF->size, TSDB_DEFAULT_PAGE_SIZE)) {
code = TSDB_CODE_FILE_CORRUPTED;
goto _err;
}
......@@ -303,10 +306,10 @@ static int32_t tsdbScanAndTryFixFS(STsdb *pTsdb) {
code = TAOS_SYSTEM_ERROR(errno);
goto _err;
}
if (size < pSet->pDataF->size) {
if (size < LOGIC_TO_FILE_SIZE(pSet->pDataF->size, TSDB_DEFAULT_PAGE_SIZE)) {
code = TSDB_CODE_FILE_CORRUPTED;
goto _err;
} else if (size > pSet->pDataF->size) {
} else if (size > LOGIC_TO_FILE_SIZE(pSet->pDataF->size, TSDB_DEFAULT_PAGE_SIZE)) {
code = tsdbDFileRollback(pTsdb, pSet, TSDB_DATA_FILE);
if (code) goto _err;
}
......@@ -317,10 +320,10 @@ static int32_t tsdbScanAndTryFixFS(STsdb *pTsdb) {
code = TAOS_SYSTEM_ERROR(errno);
goto _err;
}
if (size < pSet->pSmaF->size) {
if (size < LOGIC_TO_FILE_SIZE(pSet->pSmaF->size, TSDB_DEFAULT_PAGE_SIZE)) {
code = TSDB_CODE_FILE_CORRUPTED;
goto _err;
} else if (size > pSet->pSmaF->size) {
} else if (size > LOGIC_TO_FILE_SIZE(pSet->pSmaF->size, TSDB_DEFAULT_PAGE_SIZE)) {
code = tsdbDFileRollback(pTsdb, pSet, TSDB_SMA_FILE);
if (code) goto _err;
}
......@@ -332,7 +335,7 @@ static int32_t tsdbScanAndTryFixFS(STsdb *pTsdb) {
code = TAOS_SYSTEM_ERROR(errno);
goto _err;
}
if (size != pSet->aSstF[iSst]->size) {
if (size != LOGIC_TO_FILE_SIZE(pSet->aSstF[iSst]->size, TSDB_DEFAULT_PAGE_SIZE)) {
code = TSDB_CODE_FILE_CORRUPTED;
goto _err;
}
......@@ -364,10 +367,12 @@ static int32_t tsdbRecoverFS(STsdb *pTsdb, uint8_t *pData, int64_t nData) {
int32_t code = 0;
int8_t hasDel;
uint32_t nSet;
int32_t n;
int32_t n = 0;
// version
n += tGetI8(pData + n, NULL);
// SDelFile
n = 0;
n += tGetI8(pData + n, &hasDel);
if (hasDel) {
pTsdb->fs.pDelFile = (SDelFile *)taosMemoryMalloc(sizeof(SDelFile));
......
source/dnode/vnode/src/tsdb/tsdbFile.c
浏览文件 @ 3d7eb520
......@@ -148,7 +148,7 @@ int32_t tsdbDFileRollback(STsdb *pTsdb, SDFileSet *pSet, EDataFileT ftype) {
}
// ftruncate
if (taosFtruncateFile(pFD, size) < 0) {
if (taosFtruncateFile(pFD, LOGIC_TO_FILE_SIZE(size, TSDB_DEFAULT_PAGE_SIZE)) < 0) {
code = TAOS_SYSTEM_ERROR(errno);
goto _err;
}
......
source/dnode/vnode/src/tsdb/tsdbMergeTree.c
浏览文件 @ 3d7eb520
......@@ -16,7 +16,7 @@
#include "tsdb.h"
// SLDataIter =================================================
typedef struct SLDataIter {
struct SLDataIter {
SRBTreeNode node;
SSstBlk *pSstBlk;
SDataFReader *pReader;
......@@ -31,13 +31,11 @@ typedef struct SLDataIter {
uint64_t uid;
STimeWindow timeWindow;
SVersionRange verRange;
} SLDataIter;
};
static SBlockData* getCurrentBlock(SLDataIter* pIter) {
return &pIter->bData[pIter->loadIndex];
}
static SBlockData *getCurrentBlock(SLDataIter *pIter) { return &pIter->bData[pIter->loadIndex]; }
static SBlockData* getNextBlock(SLDataIter* pIter) {
static SBlockData *getNextBlock(SLDataIter *pIter) {
pIter->loadIndex ^= 1;
return getCurrentBlock(pIter);
}
......@@ -116,8 +114,6 @@ void tLDataIterClose(SLDataIter *pIter) {
taosMemoryFree(pIter);
}
extern int32_t tsdbReadSstBlockEx(SDataFReader *pReader, int32_t iSst, SSstBlk *pSstBlk, SBlockData *pBlockData);
void tLDataIterNextBlock(SLDataIter *pIter) {
int32_t step = pIter->backward ? -1 : 1;
pIter->iSstBlk += step;
......@@ -150,9 +146,9 @@ void tLDataIterNextBlock(SLDataIter *pIter) {
static void findNextValidRow(SLDataIter *pIter) {
int32_t step = pIter->backward ? -1 : 1;
bool hasVal = false;
int32_t i = pIter->iRow;
SBlockData* pBlockData = getCurrentBlock(pIter);
bool hasVal = false;
int32_t i = pIter->iRow;
SBlockData *pBlockData = getCurrentBlock(pIter);
for (; i < pBlockData->nRow && i >= 0; i += step) {
if (pBlockData->aUid != NULL) {
......@@ -220,12 +216,12 @@ bool tLDataIterNextRow(SLDataIter *pIter) {
return false;
}
int32_t iBlockL = pIter->iSstBlk;
SBlockData* pBlockData = getCurrentBlock(pIter);
int32_t iBlockL = pIter->iSstBlk;
SBlockData *pBlockData = getCurrentBlock(pIter);
if (pBlockData->nRow == 0 && pIter->pSstBlk != NULL) { // current block not loaded yet
pBlockData = getNextBlock(pIter);
code = tsdbReadSstBlockEx(pIter->pReader, pIter->iSst, pIter->pSstBlk, pBlockData);
code = tsdbReadSstBlock(pIter->pReader, pIter->iSst, pIter->pSstBlk, pBlockData);
if (code != TSDB_CODE_SUCCESS) {
goto _exit;
}
......@@ -249,7 +245,7 @@ bool tLDataIterNextRow(SLDataIter *pIter) {
if (iBlockL != pIter->iSstBlk) {
pBlockData = getNextBlock(pIter);
code = tsdbReadSstBlockEx(pIter->pReader, pIter->iSst, pIter->pSstBlk, pBlockData);
code = tsdbReadSstBlock(pIter->pReader, pIter->iSst, pIter->pSstBlk, pBlockData);
if (code) {
goto _exit;
}
......@@ -306,7 +302,7 @@ int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader *pFRead
tRBTreeCreate(&pMTree->rbt, tLDataIterCmprFn);
int32_t code = TSDB_CODE_OUT_OF_MEMORY;
struct SLDataIter *pIterList[TSDB_DEFAULT_LAST_FILE] = {0};
struct SLDataIter *pIterList[TSDB_DEFAULT_SST_FILE] = {0};
for (int32_t i = 0; i < pFReader->pSet->nSstF; ++i) { // open all last file
code = tLDataIterOpen(&pIterList[i], pFReader, i, pMTree->backward, uid, pTimeWindow, pVerRange);
if (code != TSDB_CODE_SUCCESS) {
......
source/dnode/vnode/src/tsdb/tsdbUtil.c
浏览文件 @ 3d7eb520
......@@ -1548,7 +1548,7 @@ int32_t tCmprBlockData(SBlockData *pBlockData, int8_t cmprAlg, uint8_t **ppOut,
if (code) goto _exit;
blockCol.offset = aBufN[0];
aBufN[0] = aBufN[0] + blockCol.szBitmap + blockCol.szOffset + blockCol.szValue + sizeof(TSCKSUM);
aBufN[0] = aBufN[0] + blockCol.szBitmap + blockCol.szOffset + blockCol.szValue;
}
code = tRealloc(&aBuf[1], hdr.szBlkCol + tPutBlockCol(NULL, &blockCol));
......@@ -1556,15 +1556,8 @@ int32_t tCmprBlockData(SBlockData *pBlockData, int8_t cmprAlg, uint8_t **ppOut,
hdr.szBlkCol += tPutBlockCol(aBuf[1] + hdr.szBlkCol, &blockCol);
}
aBufN[1] = 0;
if (hdr.szBlkCol > 0) {
aBufN[1] = hdr.szBlkCol + sizeof(TSCKSUM);
code = tRealloc(&aBuf[1], aBufN[1]);
if (code) goto _exit;
taosCalcChecksumAppend(0, aBuf[1], aBufN[1]);
}
// SBlockCol
aBufN[1] = hdr.szBlkCol;
// uid + version + tskey
aBufN[2] = 0;
......@@ -1585,16 +1578,11 @@ int32_t tCmprBlockData(SBlockData *pBlockData, int8_t cmprAlg, uint8_t **ppOut,
if (code) goto _exit;
aBufN[2] += hdr.szKey;
aBufN[2] += sizeof(TSCKSUM);
code = tRealloc(&aBuf[2], aBufN[2]);
if (code) goto _exit;
// hdr
aBufN[3] = tPutDiskDataHdr(NULL, &hdr);
code = tRealloc(&aBuf[3], aBufN[3]);
if (code) goto _exit;
tPutDiskDataHdr(aBuf[3], &hdr);
taosCalcChecksumAppend(taosCalcChecksum(0, aBuf[3], aBufN[3]), aBuf[2], aBufN[2]);
// aggragate
if (ppOut) {
......@@ -1626,10 +1614,6 @@ int32_t tDecmprBlockData(uint8_t *pIn, int32_t szIn, SBlockData *pBlockData, uin
// SDiskDataHdr
n += tGetDiskDataHdr(pIn + n, &hdr);
if (!taosCheckChecksumWhole(pIn, n + hdr.szUid + hdr.szVer + hdr.szKey + sizeof(TSCKSUM))) {
code = TSDB_CODE_FILE_CORRUPTED;
goto _exit;
}
ASSERT(hdr.delimiter == TSDB_FILE_DLMT);
pBlockData->suid = hdr.suid;
......@@ -1657,7 +1641,7 @@ int32_t tDecmprBlockData(uint8_t *pIn, int32_t szIn, SBlockData *pBlockData, uin
code = tsdbDecmprData(pIn + n, hdr.szKey, TSDB_DATA_TYPE_TIMESTAMP, hdr.cmprAlg, (uint8_t **)&pBlockData->aTSKEY,
sizeof(TSKEY) * hdr.nRow, &aBuf[0]);
if (code) goto _exit;
n = n + hdr.szKey + sizeof(TSCKSUM);
n += hdr.szKey;
// loop to decode each column data
if (hdr.szBlkCol == 0) goto _exit;
......@@ -1679,8 +1663,8 @@ int32_t tDecmprBlockData(uint8_t *pIn, int32_t szIn, SBlockData *pBlockData, uin
if (code) goto _exit;
}
} else {
code = tsdbDecmprColData(pIn + n + hdr.szBlkCol + sizeof(TSCKSUM) + blockCol.offset, &blockCol, hdr.cmprAlg,
hdr.nRow, pColData, &aBuf[0]);
code = tsdbDecmprColData(pIn + n + hdr.szBlkCol + blockCol.offset, &blockCol, hdr.cmprAlg, hdr.nRow, pColData,
&aBuf[0]);
if (code) goto _exit;
}
}
......@@ -2062,12 +2046,6 @@ int32_t tsdbCmprColData(SColData *pColData, int8_t cmprAlg, SBlockCol *pBlockCol
}
size += pBlockCol->szValue;
// checksum
size += sizeof(TSCKSUM);
code = tRealloc(ppOut, nOut + size);
if (code) goto _exit;
taosCalcChecksumAppend(0, *ppOut + nOut, size);
_exit:
return code;
}
......@@ -2076,12 +2054,6 @@ int32_t tsdbDecmprColData(uint8_t *pIn, SBlockCol *pBlockCol, int8_t cmprAlg, in
uint8_t **ppBuf) {
int32_t code = 0;
int32_t size = pBlockCol->szBitmap + pBlockCol->szOffset + pBlockCol->szValue + sizeof(TSCKSUM);
if (!taosCheckChecksumWhole(pIn, size)) {
code = TSDB_CODE_FILE_CORRUPTED;
goto _exit;
}
ASSERT(pColData->cid == pBlockCol->cid);
ASSERT(pColData->type == pBlockCol->type);
pColData->smaOn = pBlockCol->smaOn;
......@@ -2153,37 +2125,3 @@ int32_t tsdbDecmprColData(uint8_t *pIn, SBlockCol *pBlockCol, int8_t cmprAlg, in
_exit:
return code;
}
int32_t tsdbReadAndCheck(TdFilePtr pFD, int64_t offset, uint8_t **ppOut, int32_t size, int8_t toCheck) {
int32_t code = 0;
// alloc
code = tRealloc(ppOut, size);
if (code) goto _exit;
// seek
int64_t n = taosLSeekFile(pFD, offset, SEEK_SET);
if (n < 0) {
code = TAOS_SYSTEM_ERROR(errno);
goto _exit;
}
// read
n = taosReadFile(pFD, *ppOut, size);
if (n < 0) {
code = TAOS_SYSTEM_ERROR(errno);
goto _exit;
} else if (n < size) {
code = TSDB_CODE_FILE_CORRUPTED;
goto _exit;
}
// check
if (toCheck && !taosCheckChecksumWhole(*ppOut, size)) {
code = TSDB_CODE_FILE_CORRUPTED;
goto _exit;
}
_exit:
return code;
}
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