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Support FCNTL_CHUNK_SIZE on windows too.

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FossilOrigin-Name: a038688c991435967b935946c2283707820bb5da
This commit is contained in:
dan
2010-07-28 14:26:17 +00:00
parent eb8def8449
commit 502019c8bb
8 changed files with 264 additions and 127 deletions
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15
src/wal.c
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@@ -1521,6 +1521,7 @@ static int walCheckpoint(
u32 iDbpage = 0; /* Next database page to write */
u32 iFrame = 0; /* Wal frame containing data for iDbpage */
u32 mxSafeFrame; /* Max frame that can be backfilled */
u32 mxPage; /* Max database page to write */
int i; /* Loop counter */
volatile WalCkptInfo *pInfo; /* The checkpoint status information */
@@ -1545,6 +1546,7 @@ static int walCheckpoint(
** cannot be backfilled from the WAL.
*/
mxSafeFrame = pWal->hdr.mxFrame;
mxPage = pWal->hdr.nPage;
pInfo = walCkptInfo(pWal);
for(i=1; i<WAL_NREADER; i++){
u32 y = pInfo->aReadMark[i];
@@ -1565,6 +1567,8 @@ static int walCheckpoint(
if( pInfo->nBackfill<mxSafeFrame
&& (rc = walLockExclusive(pWal, WAL_READ_LOCK(0), 1))==SQLITE_OK
){
i64 nReq; /* File size hint passed to VFS */
i64 nSize; /* Current size of database file */
u32 nBackfill = pInfo->nBackfill;
/* Sync the WAL to disk */
@@ -1572,11 +1576,20 @@ static int walCheckpoint(
rc = sqlite3OsSync(pWal->pWalFd, sync_flags);
}
/* If the database file may grow as a result of this checkpoint, hint
** about the eventual size of the db file to the VFS layer.
*/
nReq = ((i64)mxPage * szPage);
rc = sqlite3OsFileSize(pWal->pDbFd, &nSize);
if( rc==SQLITE_OK && nSize<nReq ){
rc = sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_SIZE_HINT, &nReq);
}
/* Iterate through the contents of the WAL, copying data to the db file. */
while( rc==SQLITE_OK && 0==walIteratorNext(pIter, &iDbpage, &iFrame) ){
i64 iOffset;
assert( walFramePgno(pWal, iFrame)==iDbpage );
if( iFrame<=nBackfill || iFrame>mxSafeFrame ) continue;
if( iFrame<=nBackfill || iFrame>mxSafeFrame || iDbpage>mxPage ) continue;
iOffset = walFrameOffset(iFrame, szPage) + WAL_FRAME_HDRSIZE;
/* testcase( IS_BIG_INT(iOffset) ); // requires a 4GiB WAL file */
rc = sqlite3OsRead(pWal->pWalFd, zBuf, szPage, iOffset);