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Fix a pager bug that might have made multi-database commits non-atomic

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if a power failure occurred at just the wrong moment. (CVS 1900)

FossilOrigin-Name: b6eb4bf8c7763ef73723fc3d3697af435c19bae4
This commit is contained in:
drh
2004-08-21 19:20:42 +00:00
parent 290c19482e
commit fdb38064b0
5 changed files with 25 additions and 19 deletions
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5
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 1.159 2004/08/19 13:29:15 drh Exp $
** @(#) $Id: pager.c,v 1.160 2004/08/21 19:20:42 drh Exp $
*/
#include "os.h" /* Must be first to enable large file support */
#include "sqliteInt.h"
@@ -222,6 +222,7 @@ struct Pager {
u8 memDb; /* True to inhibit all file I/O */
u8 *aInJournal; /* One bit for each page in the database file */
u8 *aInStmt; /* One bit for each page in the database */
u8 setMaster; /* True if a m-j name has been written to jrnl */
BusyHandler *pBusyHandler; /* Pointer to sqlite.busyHandler */
PgHdr *pFirst, *pLast; /* List of free pages */
PgHdr *pFirstSynced; /* First free page with PgHdr.needSync==0 */
@@ -233,7 +234,6 @@ struct Pager {
off_t stmtHdrOff; /* First journal header written this statement */
off_t stmtCksum; /* cksumInit when statement was started */
int sectorSize; /* Assumed sector size during rollback */
u8 setMaster; /* True if a m-j name has been written to jrnl */
};
/*
@@ -660,6 +660,7 @@ static int writeMasterJournal(Pager *pPager, const char *zMaster){
if( rc!=SQLITE_OK ) return rc;
rc = sqlite3OsWrite(&pPager->jfd, aJournalMagic, sizeof(aJournalMagic));
pPager->needSync = 1;
return rc;
}