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When in PAGER_RESERVED state, don't write to the main file when rolling

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back a statement transaction. (CVS 1560)

FossilOrigin-Name: adb2bd61436927d37b23bae857089d62e12397af
This commit is contained in:
danielk1977
2004-06-10 04:32:16 +00:00
parent 466be56bcf
commit a3f3a5f3d2
5 changed files with 24 additions and 21 deletions
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19
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 1.120 2004/06/10 02:16:02 danielk1977 Exp $
** @(#) $Id: pager.c,v 1.121 2004/06/10 04:32:17 danielk1977 Exp $
*/
#include "os.h" /* Must be first to enable large file support */
#include "sqliteInt.h"
@@ -517,13 +517,22 @@ static int pager_playback_one_page(Pager *pPager, OsFile *jfd, int useCksum){
}
}
/* Playback the page. Update the in-memory copy of the page
** at the same time, if there is one.
assert( pPager->state==PAGER_RESERVED || pPager->state==PAGER_EXCLUSIVE );
/* If the pager is in RESERVED state, then there must be a copy of this
** page in the pager cache. In this case just update the pager cache,
** not the database file.
**
** If in EXCLUSIVE state, then we update the pager cache if it exists
** and the main file. The page is then marked not dirty.
*/
pPg = pager_lookup(pPager, pgno);
assert( pPager->state==PAGER_EXCLUSIVE || pPg );
TRACE2("PLAYBACK page %d\n", pgno);
sqlite3OsSeek(&pPager->fd, (pgno-1)*(off_t)SQLITE_PAGE_SIZE);
rc = sqlite3OsWrite(&pPager->fd, aData, SQLITE_PAGE_SIZE);
if( pPager->state==PAGER_EXCLUSIVE ){
sqlite3OsSeek(&pPager->fd, (pgno-1)*(off_t)SQLITE_PAGE_SIZE);
rc = sqlite3OsWrite(&pPager->fd, aData, SQLITE_PAGE_SIZE);
}
if( pPg ){
/* No page should ever be rolled back that is in use, except for page
** 1 which is held in use in order to keep the lock on the database