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Overview
| Comment: | Simplifications to the memjournal.c logic to facilitate testing. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 8baa2c2c7698e03418531482a8314a5d |
| User & Date: | drh 2016-03-09 04:17:17 |
Context
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2016-03-09
| ||
| 11:59 | Disable the bestindex*.test modules when building without virtual table support. check-in: e0bac2f3 user: drh tags: trunk | |
| 08:08 | Merge latest trunk changes with this branch. check-in: 59caca43 user: dan tags: schemalint | |
| 04:17 | Simplifications to the memjournal.c logic to facilitate testing. check-in: 8baa2c2c user: drh tags: trunk | |
| 03:44 | Move the write failure test in memjrnlCreateFile() to just after the actual write, thus reducing the number of instances of the test by one. check-in: 7f00d80c user: drh tags: trunk | |
Changes
Changes to src/memjournal.c.
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static int memjrnlRead(
sqlite3_file *pJfd, /* The journal file from which to read */
void *zBuf, /* Put the results here */
int iAmt, /* Number of bytes to read */
sqlite_int64 iOfst /* Begin reading at this offset */
){
MemJournal *p = (MemJournal *)pJfd;
if( (iAmt+iOfst)>p->endpoint.iOffset ){
return SQLITE_IOERR_SHORT_READ;
}else{
u8 *zOut = zBuf;
int nRead = iAmt;
int iChunkOffset;
FileChunk *pChunk;
if( p->readpoint.iOffset!=iOfst || iOfst==0 ){
sqlite3_int64 iOff = 0;
for(pChunk=p->pFirst;
ALWAYS(pChunk) && (iOff+p->nChunkSize)<=iOfst;
pChunk=pChunk->pNext
){
iOff += p->nChunkSize;
}
}else{
pChunk = p->readpoint.pChunk;
}
iChunkOffset = (int)(iOfst%p->nChunkSize);
do {
int iSpace = p->nChunkSize - iChunkOffset;
int nCopy = MIN(nRead, (p->nChunkSize - iChunkOffset));
memcpy(zOut, (u8*)pChunk->zChunk + iChunkOffset, nCopy);
zOut += nCopy;
nRead -= iSpace;
iChunkOffset = 0;
} while( nRead>=0 && (pChunk=pChunk->pNext)!=0 && nRead>0 );
p->readpoint.iOffset = iOfst+iAmt;
p->readpoint.pChunk = pChunk;
}
return SQLITE_OK;
}
/*
** Free the list of FileChunk structures headed at MemJournal.pFirst.
*/
................................................................................
memset(p, 0, sizeof(MemJournal));
rc = sqlite3OsOpen(copy.pVfs, copy.zJournal, pReal, copy.flags, 0);
if( rc==SQLITE_OK ){
int nChunk = copy.nChunkSize;
i64 iOff = 0;
FileChunk *pIter;
for(pIter=copy.pFirst; pIter; pIter=pIter->pNext){
int nWrite = nChunk;
if( pIter==copy.endpoint.pChunk ){
nWrite = copy.endpoint.iOffset % copy.nChunkSize;
if( nWrite==0 ) nWrite = copy.nChunkSize;
}
rc = sqlite3OsWrite(pReal, (u8*)pIter->zChunk, nWrite, iOff);
if( rc ) break;
iOff += nWrite;
}
if( rc==SQLITE_OK ){
/* No error has occurred. Free the in-memory buffers. */
memjrnlFreeChunks(©);
}
}
if( rc!=SQLITE_OK ){
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static int memjrnlRead(
sqlite3_file *pJfd, /* The journal file from which to read */
void *zBuf, /* Put the results here */
int iAmt, /* Number of bytes to read */
sqlite_int64 iOfst /* Begin reading at this offset */
){
MemJournal *p = (MemJournal *)pJfd;
u8 *zOut = zBuf;
int nRead = iAmt;
int iChunkOffset;
FileChunk *pChunk;
#ifdef SQLITE_ENABLE_ATOMIC_WRITE
if( (iAmt+iOfst)>p->endpoint.iOffset ){
return SQLITE_IOERR_SHORT_READ;
}
#endif
assert( (iAmt+iOfst)<=p->endpoint.iOffset );
if( p->readpoint.iOffset!=iOfst || iOfst==0 ){
sqlite3_int64 iOff = 0;
for(pChunk=p->pFirst;
ALWAYS(pChunk) && (iOff+p->nChunkSize)<=iOfst;
pChunk=pChunk->pNext
){
iOff += p->nChunkSize;
}
}else{
pChunk = p->readpoint.pChunk;
}
iChunkOffset = (int)(iOfst%p->nChunkSize);
do {
int iSpace = p->nChunkSize - iChunkOffset;
int nCopy = MIN(nRead, (p->nChunkSize - iChunkOffset));
memcpy(zOut, (u8*)pChunk->zChunk + iChunkOffset, nCopy);
zOut += nCopy;
nRead -= iSpace;
iChunkOffset = 0;
} while( nRead>=0 && (pChunk=pChunk->pNext)!=0 && nRead>0 );
p->readpoint.iOffset = iOfst+iAmt;
p->readpoint.pChunk = pChunk;
return SQLITE_OK;
}
/*
** Free the list of FileChunk structures headed at MemJournal.pFirst.
*/
................................................................................
memset(p, 0, sizeof(MemJournal));
rc = sqlite3OsOpen(copy.pVfs, copy.zJournal, pReal, copy.flags, 0);
if( rc==SQLITE_OK ){
int nChunk = copy.nChunkSize;
i64 iOff = 0;
FileChunk *pIter;
for(pIter=copy.pFirst; pIter; pIter=pIter->pNext){
if( iOff + nChunk > copy.endpoint.iOffset ){
nChunk = copy.endpoint.iOffset - iOff;
}
rc = sqlite3OsWrite(pReal, (u8*)pIter->zChunk, nChunk, iOff);
if( rc ) break;
iOff += nChunk;
}
if( rc==SQLITE_OK ){
/* No error has occurred. Free the in-memory buffers. */
memjrnlFreeChunks(©);
}
}
if( rc!=SQLITE_OK ){
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