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Add the "truncate" journal mode which commits transactions by truncating the

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rollback journal file to zero length and not calling fsync(). (CVS 5745)

FossilOrigin-Name: 7c561f2e9264de676c1028943f6c3d06542fd802
This commit is contained in:
drh
2008-09-26 21:08:08 +00:00
parent 9e2d64b8d3
commit 04335886a1
7 changed files with 92 additions and 29 deletions
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30
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 1.494 2008/09/23 16:41:30 danielk1977 Exp $
** @(#) $Id: pager.c,v 1.495 2008/09/26 21:08:08 drh Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
@@ -971,7 +971,11 @@ static int pager_end_transaction(Pager *pPager, int hasMaster){
pPager->stmtOpen = 0;
}
if( pPager->journalOpen ){
if( pPager->exclusiveMode
if( pPager->journalMode==PAGER_JOURNALMODE_TRUNCATE
&& (rc = sqlite3OsTruncate(pPager->jfd, 0))==SQLITE_OK ){
pPager->journalOff = 0;
pPager->journalStarted = 0;
}else if( pPager->exclusiveMode
|| pPager->journalMode==PAGER_JOURNALMODE_PERSIST
){
rc = zeroJournalHdr(pPager, hasMaster);
@@ -979,6 +983,7 @@ static int pager_end_transaction(Pager *pPager, int hasMaster){
pPager->journalOff = 0;
pPager->journalStarted = 0;
}else{
assert( pPager->journalMode==PAGER_JOURNALMODE_DELETE || rc );
sqlite3OsClose(pPager->jfd);
pPager->journalOpen = 0;
if( rc==SQLITE_OK && !pPager->tempFile ){
@@ -4207,24 +4212,31 @@ int sqlite3PagerLockingMode(Pager *pPager, int eMode){
}
/*
** Get/set the journal-mode for this pager. Parameter eMode must be one
** of PAGER_JOURNALMODE_QUERY, PAGER_JOURNALMODE_DELETE or
** PAGER_JOURNALMODE_PERSIST. If the parameter is not _QUERY, then
** the journal-mode is set to the value specified.
** Get/set the journal-mode for this pager. Parameter eMode must be one of:
**
** The returned value is either PAGER_JOURNALMODE_DELETE or
** PAGER_JOURNALMODE_PERSIST, indicating the current (possibly updated)
** PAGER_JOURNALMODE_QUERY
** PAGER_JOURNALMODE_DELETE
** PAGER_JOURNALMODE_TRUNCATE
** PAGER_JOURNALMODE_PERSIST
** PAGER_JOURNALMODE_OFF
**
** If the parameter is not _QUERY, then the journal-mode is set to the
** value specified.
**
** The returned indicate the current (possibly updated)
** journal-mode.
*/
int sqlite3PagerJournalMode(Pager *pPager, int eMode){
assert( eMode==PAGER_JOURNALMODE_QUERY
|| eMode==PAGER_JOURNALMODE_DELETE
|| eMode==PAGER_JOURNALMODE_TRUNCATE
|| eMode==PAGER_JOURNALMODE_PERSIST
|| eMode==PAGER_JOURNALMODE_OFF );
assert( PAGER_JOURNALMODE_QUERY<0 );
assert( PAGER_JOURNALMODE_DELETE>=0 && PAGER_JOURNALMODE_PERSIST>=0 );
if( eMode>=0 ){
pPager->journalMode = eMode;
}else{
assert( eMode==PAGER_JOURNALMODE_QUERY );
}
return (int)pPager->journalMode;
}