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Fixes for problems with small caches and SAVEPOINT rollback in WAL mode.

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FossilOrigin-Name: 6a944f028d4a070bef29e1fbc6fbef481ebcd34c
This commit is contained in:
dan
2010-04-26 16:57:10 +00:00
parent 71cb518fca
commit 4cd78b4d89
8 changed files with 141 additions and 28 deletions
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25
src/wal.c
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@@ -1669,6 +1669,27 @@ int sqlite3WalUndo(Log *pLog, int (*xUndo)(void *, Pgno), void *pUndoCtx){
return rc;
}
u32 sqlite3WalSavepoint(Log *pLog){
assert( pLog->isWriteLocked );
return pLog->hdr.iLastPg;
}
int sqlite3WalSavepointUndo(Log *pLog, u32 iFrame){
int rc = SQLITE_OK;
u8 aCksum[8];
assert( pLog->isWriteLocked );
pLog->hdr.iLastPg = iFrame;
if( iFrame>0 ){
i64 iOffset = logFrameOffset(iFrame, pLog->hdr.pgsz) + sizeof(u32)*2;
rc = sqlite3OsRead(pLog->pFd, aCksum, sizeof(aCksum), iOffset);
pLog->hdr.iCheck1 = sqlite3Get4byte(&aCksum[0]);
pLog->hdr.iCheck2 = sqlite3Get4byte(&aCksum[4]);
}
return rc;
}
/*
** Return true if data has been written but not committed to the log file.
*/
@@ -1678,8 +1699,8 @@ int sqlite3WalDirty(Log *pLog){
}
/*
** Write a set of frames to the log. The caller must hold at least a
** RESERVED lock on the database file.
** Write a set of frames to the log. The caller must hold the write-lock
** on the log file (obtained using sqlite3WalWriteLock()).
*/
int sqlite3WalFrames(
Log *pLog, /* Log handle to write to */