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Add the SQLITE_FCNTL_OVERWRITE file-control. Used by SQLite to indicate to the OS layer that the current transaction will overwrite the entire file.

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FossilOrigin-Name: 1da87fcdacfa7d277c3ee98e410a9ea8b529c368
This commit is contained in:
dan
2011-10-07 16:57:59 +00:00
parent f3259997c0
commit c5f20a0061
5 changed files with 30 additions and 18 deletions
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9
src/backup.c
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@@ -669,10 +669,18 @@ void sqlite3BackupRestart(sqlite3_backup *pBackup){
*/
int sqlite3BtreeCopyFile(Btree *pTo, Btree *pFrom){
int rc;
sqlite3_file *pFd; /* File descriptor for database pTo */
sqlite3_backup b;
sqlite3BtreeEnter(pTo);
sqlite3BtreeEnter(pFrom);
assert( sqlite3BtreeIsInTrans(pTo) );
pFd = sqlite3PagerFile(sqlite3BtreePager(pTo));
if( pFd->pMethods ){
i64 nByte = sqlite3BtreeGetPageSize(pFrom)*(i64)sqlite3BtreeLastPage(pFrom);
sqlite3OsFileControl(pFd, SQLITE_FCNTL_OVERWRITE, &nByte);
}
/* Set up an sqlite3_backup object. sqlite3_backup.pDestDb must be set
** to 0. This is used by the implementations of sqlite3_backup_step()
** and sqlite3_backup_finish() to detect that they are being called
@@ -698,6 +706,7 @@ int sqlite3BtreeCopyFile(Btree *pTo, Btree *pFrom){
pTo->pBt->pageSizeFixed = 0;
}
assert( sqlite3BtreeIsInTrans(pTo)==0 );
sqlite3BtreeLeave(pFrom);
sqlite3BtreeLeave(pTo);
return rc;