diff --git a/manifest b/manifest
index d8d3cd2e07..f868d02777 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sthe\spager\sso\sthat\sit\sremembers\sthe\sname\sof\sthe\sjournal\sfor\san\sin-memory\ndatabase\sas\san\sempty\sstring.\s\sThis\sis\simportant\swhen\scommitting\sa\smulti-database\ntransaction\sthat\sincludes\sone\sor\smore\sattached\smemory\sdatabases.\s(CVS\s6852)
-D 2009-07-06T21:54:41
+C Simplifications\sto\sbtree.c\sand\svdbeaux.c\sin\ssupport\sof\sstructural\scoverage\ntesting.\s(CVS\s6853)
+D 2009-07-07T02:44:07
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in df9359da7a726ccb67a45db905c5447d5c00c6ef
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -106,7 +106,7 @@ F src/auth.c 802a9439dfa0b8c208b10055cba400e82ef18025
 F src/backup.c 6f1c2d9862c8a3feb7739dfcca02c1f5352e37f3
 F src/bitvec.c 0ef0651714728055d43de7a4cdd95e703fac0119
 F src/btmutex.c 9b899c0d8df3bd68f527b0afe03088321b696d3c
-F src/btree.c 1a7caa2b0dfd76a7e28049e2333997e6f317c9f3
+F src/btree.c efad7a5ac6c460aa326de8df290e72af54b2a96e
 F src/btree.h e761619e76a1125d2d82bd3613b5a7ac7d1ee6f7
 F src/btreeInt.h b31e5ac04181c7e2892c33ab06228c551df6233c
 F src/build.c 867028ee9f63f7bc8eb8d4a720bb98cf9b9a12b4
@@ -208,7 +208,7 @@ F src/vdbe.c bdf25930bddbf57b18a0be7b1127b357306d2094
 F src/vdbe.h 35a648bc3279a120da24f34d9a25213ec15daf8a
 F src/vdbeInt.h 831c254a6eef237ef4664c8381a0137586567007
 F src/vdbeapi.c 0ab8ada7260b32031ca97f338caecf0812460624
-F src/vdbeaux.c f62c8c83e9f21e13df6acaace8851f1de17cadc0
+F src/vdbeaux.c 67fb11dbb83fb18bebc877c5a2e23fbe07a5df77
 F src/vdbeblob.c a3f3e0e877fc64ea50165eec2855f5ada4477611
 F src/vdbemem.c 1618f685d19b4bcc96e40b3c478487bafd2ae246
 F src/vtab.c 00902f289521041712fb0293d0bf8688c7af8e48
@@ -740,7 +740,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl 672f81d693a03f80f5ae60bfefacd8a349e76746
-P 471b92f2514aedecb5773825a7ae472190375727
-R ef6e25ecc3f3fe23089721c79b7f9768
+P 31a5e8192e164f01c5d7c2744b67cfb517251fad
+R 100495e4081a84deef5f1cdee7a55f95
 U drh
-Z 349e16f4481329396dd2c2a2c8daa3ce
+Z 8f0c5bdca0336a3f4c49fe6be74bffd7
diff --git a/manifest.uuid b/manifest.uuid
index 3af8292094..f29584bbc2 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-31a5e8192e164f01c5d7c2744b67cfb517251fad
\ No newline at end of file
+fc2a40a9db23285da16f40f5131613907fb80f02
\ No newline at end of file
diff --git a/src/btree.c b/src/btree.c
index 0675f098b3..10d06c0ec2 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 1.653 2009/07/06 18:56:13 danielk1977 Exp $
+** $Id: btree.c,v 1.654 2009/07/07 02:44:07 drh Exp $
 **
 ** This file implements a external (disk-based) database using BTrees.
 ** See the header comment on "btreeInt.h" for additional information.
@@ -3496,8 +3496,8 @@ int sqlite3BtreeDataSize(BtCursor *pCur, u32 *pSize){
 ** *ppPage is set to zero.
 */
 static int getOverflowPage(
-  BtShared *pBt, 
-  Pgno ovfl,                   /* Overflow page */
+  BtShared *pBt,               /* The database file */
+  Pgno ovfl,                   /* Current overflow page number */
   MemPage **ppPage,            /* OUT: MemPage handle (may be NULL) */
   Pgno *pPgnoNext              /* OUT: Next overflow page number */
 ){
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index 466b850436..a044e20c01 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -14,7 +14,7 @@
 ** to version 2.8.7, all this code was combined into the vdbe.c source file.
 ** But that file was getting too big so this subroutines were split out.
 **
-** $Id: vdbeaux.c,v 1.468 2009/07/06 00:44:09 drh Exp $
+** $Id: vdbeaux.c,v 1.469 2009/07/07 02:44:07 drh Exp $
 */
 #include "sqliteInt.h"
 #include "vdbeInt.h"
@@ -1616,7 +1616,7 @@ static void invalidateCursorsOnModifiedBtrees(sqlite3 *db){
 int sqlite3VdbeCloseStatement(Vdbe *p, int eOp){
   sqlite3 *const db = p->db;
   int rc = SQLITE_OK;
-  if( p->iStatement && db->nStatement ){
+  if( p->iStatement && ALWAYS(db->nStatement) ){
     int i;
     const int iSavepoint = p->iStatement-1;
 
@@ -1725,6 +1725,7 @@ int sqlite3VdbeHalt(Vdbe *p){
 
     /* Check for one of the special errors */
     mrc = p->rc & 0xff;
+    assert( p->rc!=SQLITE_IOERR_BLOCKED );  /* This error no longer exists */
     isSpecialError = mrc==SQLITE_NOMEM || mrc==SQLITE_IOERR
                      || mrc==SQLITE_INTERRUPT || mrc==SQLITE_FULL;
     if( isSpecialError ){
@@ -1732,11 +1733,7 @@ int sqlite3VdbeHalt(Vdbe *p){
       ** proceed with the special handling.
       */
       if( !p->readOnly || mrc!=SQLITE_INTERRUPT ){
-        if( p->rc==SQLITE_IOERR_BLOCKED && p->usesStmtJournal ){
-          eStatementOp = SAVEPOINT_ROLLBACK;
-          p->rc = SQLITE_BUSY;
-        }else if( (mrc==SQLITE_NOMEM || mrc==SQLITE_FULL)
-                   && p->usesStmtJournal ){
+        if( (mrc==SQLITE_NOMEM || mrc==SQLITE_FULL) && p->usesStmtJournal ){
           eStatementOp = SAVEPOINT_ROLLBACK;
         }else{
           /* We are forced to roll back the active transaction. Before doing
@@ -1958,8 +1955,6 @@ int sqlite3VdbeFinalize(Vdbe *p){
   if( p->magic==VDBE_MAGIC_RUN || p->magic==VDBE_MAGIC_HALT ){
     rc = sqlite3VdbeReset(p);
     assert( (rc & p->db->errMask)==rc );
-  }else if( p->magic!=VDBE_MAGIC_INIT ){
-    return SQLITE_MISUSE;
   }
   sqlite3VdbeDelete(p);
   return rc;
@@ -1991,7 +1986,7 @@ void sqlite3VdbeDelete(Vdbe *p){
   int i;
   sqlite3 *db;
 
-  if( p==0 ) return;
+  if( NEVER(p==0) ) return;
   db = p->db;
   if( p->pPrev ){
     p->pPrev->pNext = p->pNext;