From ea89730823331765de66391998f58b8a11a02c29 Mon Sep 17 00:00:00 2001
From: danielk1977 <danielk1977@noemail.net>
Date: Fri, 19 Sep 2008 15:10:58 +0000
Subject: [PATCH] In sqlite3BtreeGetMeta(), if BtShared.pPage1 is available use
 it instead of requesting a new reference from the pager layer. (CVS 5724)

FossilOrigin-Name: 59be34cfa4fe74f7e5b547c55d273ecba9d7796c
---
 manifest      | 12 ++++++------
 manifest.uuid |  2 +-
 src/btree.c   | 23 +++++++++++++++--------
 3 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/manifest b/manifest
index cac3999762..b5eb763553 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Remove\san\sobsolete\slayer\sof\sredirection\sin\spager.c.\s(CVS\s5723)
-D 2008-09-19T09:14:44
+C In\ssqlite3BtreeGetMeta(),\sif\sBtShared.pPage1\sis\savailable\suse\sit\sinstead\sof\srequesting\sa\snew\sreference\sfrom\sthe\spager\slayer.\s(CVS\s5724)
+D 2008-09-19T15:10:58
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in d15a7ebfe5e057a72a49805ffb302dbb601c8329
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -99,7 +99,7 @@ F src/attach.c db3f4a60538733c1e4dcb9d0217a6e0d6ccd615b
 F src/auth.c c8b2ab5c8bad4bd90ed7c294694f48269162c627
 F src/bitvec.c 95c86bd18d8fedf0533f5af196192546e10a7e7d
 F src/btmutex.c 709cad2cdca0afd013f0f612363810e53f59ec53
-F src/btree.c 54fc8950e4c292ff92bb431449a27772862feae9
+F src/btree.c cfe8dbbaa75f587653f33121c3e82999c65069ae
 F src/btree.h 6371c5e599fab391a150c96afbc10062b276d107
 F src/btreeInt.h e36f77e6621d671beb19ae581af1eba116cdfdc4
 F src/build.c 160c71acca8f643f436ed6c1ee2f684c88df4dfe
@@ -637,7 +637,7 @@ F tool/speedtest16.c c8a9c793df96db7e4933f0852abb7a03d48f2e81
 F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 1dbced29de5f59ba2ebf877edcadf171540374d1
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
-P 4de71a4e2f59d302156e10efcb288efa23e18598
-R e7e88b502f42bf2bf854d0ef69d24fbc
+P 75deaa442f3a363c4ea5b6f0e510306feeaa8915
+R 62a9176bcf4a5c57a6633d26293ede50
 U danielk1977
-Z a0c5df28c3667ba69a8633d2e8e61142
+Z 89134c443f08e4715d35e3ebe96ef424
diff --git a/manifest.uuid b/manifest.uuid
index 87582be27d..a8be7d7d02 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-75deaa442f3a363c4ea5b6f0e510306feeaa8915
\ No newline at end of file
+59be34cfa4fe74f7e5b547c55d273ecba9d7796c
\ No newline at end of file
diff --git a/src/btree.c b/src/btree.c
index b7f738ab59..3c1512f2b3 100644
--- a/src/btree.c
+++ b/src/btree.c
@@ -9,7 +9,7 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** $Id: btree.c,v 1.514 2008/09/18 18:17:04 danielk1977 Exp $
+** $Id: btree.c,v 1.515 2008/09/19 15:10:58 danielk1977 Exp $
 **
 ** This file implements a external (disk-based) database using BTrees.
 ** See the header comment on "btreeInt.h" for additional information.
@@ -1148,7 +1148,7 @@ static int getAndInitPage(
     pPage = *ppPage;
   }
   if( pPage->isInit!=PAGE_ISINIT_FULL ){
-     rc = sqlite3BtreeInitPage(pPage, pParent);
+    rc = sqlite3BtreeInitPage(pPage, pParent);
   }else if( pParent && (pPage==pParent || pPage->pParent!=pParent) ){
     /* This condition indicates a loop in the b-tree structure (the scenario
     ** where database corruption has caused a page to be a direct or
@@ -6472,14 +6472,21 @@ int sqlite3BtreeGetMeta(Btree *p, int idx, u32 *pMeta){
   }
 
   assert( idx>=0 && idx<=15 );
-  rc = sqlite3PagerGet(pBt->pPager, 1, &pDbPage);
-  if( rc ){
-    sqlite3BtreeLeave(p);
-    return rc;
+  if( !pBt->pPage1 ){
+    rc = sqlite3PagerGet(pBt->pPager, 1, &pDbPage);
+    if( rc ){
+      sqlite3BtreeLeave(p);
+      return rc;
+    }
+    pP1 = (unsigned char *)sqlite3PagerGetData(pDbPage);
+  }else{
+    pP1 = (unsigned char *)pBt->pPage1->aData;
   }
-  pP1 = (unsigned char *)sqlite3PagerGetData(pDbPage);
   *pMeta = get4byte(&pP1[36 + idx*4]);
-  sqlite3PagerUnref(pDbPage);
+
+  if( !pBt->pPage1 ){
+    sqlite3PagerUnref(pDbPage);
+  }
 
   /* If autovacuumed is disabled in this build but we are trying to 
   ** access an autovacuumed database, then make the database readonly.