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If the sector size is greater than the database page size, SQLite journals all pages that lie within a sector before writing to any of them. This change ensure that a journal sync does not occur halfway through journalling the set of pages that belong to a single sector. (CVS 5605)

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FossilOrigin-Name: 16f612d61e00938f29ecae4ebfe598be7a8709a8
This commit is contained in:
danielk1977
2008-08-25 07:12:28 +00:00
parent 33e3216a3d
commit 8c20014a0a
5 changed files with 45 additions and 31 deletions
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49
src/pcache.c
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@@ -11,7 +11,7 @@
*************************************************************************
** This file implements that page cache.
**
** @(#) $Id: pcache.c,v 1.11 2008/08/23 18:53:08 danielk1977 Exp $
** @(#) $Id: pcache.c,v 1.12 2008/08/25 07:12:29 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -455,6 +455,23 @@ static int pcachePageSize(PgHdr *p){
}
#endif
static int pcacheRecyclePage(PgHdr *p, PCache *pCache){
assert( sqlite3_mutex_held(pcache.mutex_lru) );
assert( sqlite3_mutex_held(pcache.mutex_mem2) );
PCache *pC = p->pCache;
assert( pC->iInUseMM==0 );
pC->iInUseMM = 1;
if( pC->xStress && (pC->iInUseDB==0 || pC==pCache) ){
pcacheExitGlobal();
pC->xStress(pC->pStress, p);
pcacheEnterGlobal();
}
pC->iInUseMM = 0;
return (p->flags&PGHDR_DIRTY);
}
/*
** Recycle a page from the global LRU list. If no page can be recycled,
** return NULL. Otherwise, the pointer returned points to a PgHdr
@@ -469,26 +486,18 @@ static PgHdr *pcacheRecycle(PCache *pCache){
assert( pcache.isInit );
assert( sqlite3_mutex_held(pcache.mutex_lru) );
p = pcache.pLruSynced;
if( !p ){
p = pcache.pLruTail;
}
if( p && (p->flags&PGHDR_DIRTY) ){
if( SQLITE_OK==sqlite3_mutex_try(pcache.mutex_mem2) ){
PCache *pC = p->pCache;
assert( pC->iInUseMM==0 );
pC->iInUseMM = 1;
if( pC->xStress && (pC->iInUseDB==0 || pC==pCache) ){
pcacheExitGlobal();
pC->xStress(pC->pStress, p);
pcacheEnterGlobal();
}
pC->iInUseMM = 0;
sqlite3_mutex_leave(pcache.mutex_mem2);
if( SQLITE_OK==sqlite3_mutex_try(pcache.mutex_mem2) ){
p = pcache.pLruSynced;
while( p && (p->flags&PGHDR_DIRTY) && pcacheRecyclePage(p, pCache) ){
do { p = p->pPrevLru; } while( p && (p->flags&PGHDR_NEED_SYNC) );
}
}
if( p && (p->flags&PGHDR_DIRTY) ){
p = 0;
if( !p ){
p = pcache.pLruTail;
while( p && (p->flags&PGHDR_DIRTY) && pcacheRecyclePage(p, pCache) ){
do { p = p->pPrevLru; } while( p && 0==(p->flags&PGHDR_NEED_SYNC) );
}
}
sqlite3_mutex_leave(pcache.mutex_mem2);
}
if( p ){