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In the btree.c, when releasing the page1 lock, first make sure the

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pager has not reset and released the lock already.  This fixes a bug
introduced by (3549). (CVS 3563)

FossilOrigin-Name: 36a2db96efa7f227c0a39e58fd83d56cc491472b
This commit is contained in:
drh
2007-01-05 02:00:47 +00:00
parent ba92a2ebad
commit 24c9a2eeb2
4 changed files with 20 additions and 19 deletions
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17
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.332 2006/12/18 18:34:51 drh Exp $
** $Id: btree.c,v 1.333 2007/01/05 02:00:47 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -1931,13 +1931,15 @@ static int lockBtreeWithRetry(Btree *pRef){
*/
static void unlockBtreeIfUnused(BtShared *pBt){
if( pBt->inTransaction==TRANS_NONE && pBt->pCursor==0 && pBt->pPage1!=0 ){
if( pBt->pPage1->aData==0 ){
MemPage *pPage = pBt->pPage1;
pPage->aData = &((u8*)pPage)[-pBt->pageSize];
pPage->pBt = pBt;
pPage->pgno = 1;
if( sqlite3pager_refcount(pBt->pPager)>=1 ){
if( pBt->pPage1->aData==0 ){
MemPage *pPage = pBt->pPage1;
pPage->aData = &((u8*)pPage)[-pBt->pageSize];
pPage->pBt = pBt;
pPage->pgno = 1;
}
releasePage(pBt->pPage1);
}
releasePage(pBt->pPage1);
pBt->pPage1 = 0;
pBt->inStmt = 0;
}
@@ -6424,7 +6426,6 @@ int sqlite3BtreeCopyFile(Btree *pTo, Btree *pFrom){
rc = sqlite3pager_get(pBtFrom->pPager, i, &pPage);
if( rc ) break;
rc = sqlite3pager_overwrite(pBtTo->pPager, i, pPage);
if( rc ) break;
sqlite3pager_unref(pPage);
}
for(i=nPage+1; rc==SQLITE_OK && i<=nToPage; i++){