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Add the SQLITE_FCNTL_CKPT_START file-control. Use it to optimize the

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cksumvfs extension.

FossilOrigin-Name: b40f5aa344ae10cf4da83b3aa9e4866d6f6ffb06ba7e34ec1ce80c92468cf3bf
This commit is contained in:
drh
2020-05-01 18:37:34 +00:00
parent 5051194270
commit fcf31b28ff
5 changed files with 51 additions and 25 deletions
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6
src/wal.c
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@@ -1868,6 +1868,7 @@ static int walCheckpoint(
if( rc==SQLITE_OK ){
i64 nReq = ((i64)mxPage * szPage);
i64 nSize; /* Current size of database file */
sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_START, 0);
rc = sqlite3OsFileSize(pWal->pDbFd, &nSize);
if( rc==SQLITE_OK && nSize<nReq ){
sqlite3OsFileControlHint(pWal->pDbFd, SQLITE_FCNTL_SIZE_HINT, &nReq);
@@ -1895,6 +1896,7 @@ static int walCheckpoint(
rc = sqlite3OsWrite(pWal->pDbFd, zBuf, szPage, iOffset);
if( rc!=SQLITE_OK ) break;
}
sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_DONE, 0);
/* If work was actually accomplished... */
if( rc==SQLITE_OK ){
@@ -1906,10 +1908,6 @@ static int walCheckpoint(
rc = sqlite3OsSync(pWal->pDbFd, CKPT_SYNC_FLAGS(sync_flags));
}
}
if( rc==SQLITE_OK ){
rc = sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_CKPT_DONE, 0);
if( rc==SQLITE_NOTFOUND ) rc = SQLITE_OK;
}
if( rc==SQLITE_OK ){
pInfo->nBackfill = mxSafeFrame;
}