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Bug fix: When the database file grows in size during a transaction, make sure

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the last page of the file gets written to disk even if that page is on the
free list and contains no data.  Otherwise the disk file will be too small
which can lead to database corruption in subsequent transactions. (CVS 643)

FossilOrigin-Name: 36fc0add660f9f3676783765d37280aa874caecb
This commit is contained in:
drh
2002-06-25 14:43:57 +00:00
parent 2150432e7c
commit 8124a30f82
5 changed files with 30 additions and 12 deletions
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15
src/pager.c
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@@ -18,7 +18,7 @@
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.46 2002/05/30 12:27:03 drh Exp $
** @(#) $Id: pager.c,v 1.47 2002/06/25 14:43:58 drh Exp $
*/
#include "sqliteInt.h"
#include "pager.h"
@@ -1195,7 +1195,18 @@ void sqlitepager_dont_write(Pager *pPager, Pgno pgno){
PgHdr *pPg;
pPg = pager_lookup(pPager, pgno);
if( pPg && pPg->dirty ){
pPg->dirty = 0;
if( pPager->dbSize==(int)pPg->pgno && pPager->origDbSize<pPager->dbSize ){
/* If this pages is the last page in the file and the file has grown
** during the current transaction, then do NOT mark the page as clean.
** When the database file grows, we must make sure that the last page
** gets written at least once so that the disk file will be the correct
** size. If you do not write this page and the size of the file
** on the disk ends up being too small, that can lead to database
** corruption during the next transaction.
*/
}else{
pPg->dirty = 0;
}
}
}