diff --git a/manifest b/manifest
index 40213f1639..7f3d514ca1 100644
--- a/manifest
+++ b/manifest
@@ -1,8 +1,5 @@
------BEGIN PGP SIGNED MESSAGE-----
-Hash: SHA1
-
-C Fix\sdisabled\simplementation-mark\scomments\sin\sfunc.c.
-D 2010-08-03T18:06:25
+C When\sopening\sa\swrite-transaction\son\sa\sdatabase\sfile\sthat\shas\sbeen\sappended\sto\sor\struncated\sby\sa\spre-3.7.0\sclient,\supdate\sthe\sdatabase-size\sfield\sin\sthe\sdatabase\sheader.\sFix\sfor\s[51ae9cad31].
+D 2010-08-04T11:34:31
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in ec08dc838fd8110fe24c92e5130bcd91cbb1ff2e
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -116,7 +113,7 @@ F src/auth.c 523da7fb4979469955d822ff9298352d6b31de34
 F src/backup.c 51d83300fe0baee39405c416ceb19a58ed30a8ed
 F src/bitvec.c 06ad2c36a9c3819c0b9cbffec7b15f58d5d834e0
 F src/btmutex.c 96a12f50f7a17475155971a241d85ec5171573ff
-F src/btree.c 2b122b7d7dec94670ecaa70f92397406100036aa
+F src/btree.c 397093afc0019b973e1c4403480431d13219c2e3
 F src/btree.h b4ba2fdf6b64c7c376bdfffa826af6b786b151d9
 F src/btreeInt.h b0c87f6725b06a0aa194a6d25d54b16ce9d6e291
 F src/build.c 0018d49629fc4807100c988dd191dd95e185bb38
@@ -355,7 +352,7 @@ F test/exclusive2.test fcbb1c9ca9739292a0a22a3763243ad6d868086b
 F test/exec.test e949714dc127eaa5ecc7d723efec1ec27118fdd7
 F test/expr.test 9f521ae22f00e074959f72ce2e55d46b9ed23f68
 F test/filectrl.test 97003734290887566e01dded09dc9e99cb937e9e
-F test/filefmt.test 5d271bf467e6557fe7499dcc8203069c9dc5825e
+F test/filefmt.test f77c92141960b7933bc6691631d2ad62257ef40a
 F test/fkey1.test 01c7de578e11747e720c2d9aeef27f239853c4da
 F test/fkey2.test e028cd80aa0bd38541c99214e3ba2dfccadffe6f
 F test/fkey3.test 42f88d6048d8dc079e2a8cf7baad1cc1483a7620
@@ -543,7 +540,7 @@ F test/null.test a8b09b8ed87852742343b33441a9240022108993
 F test/openv2.test af02ed0a9cbc0d2a61b8f35171d4d117e588e4ec
 F test/pager1.test d8e4b2bc8164c920e6ea0572c9e13576d6e4f3fa
 F test/pager2.test f5c757c271ce642d36a393ecbfb3aef1c240dcef
-F test/pagerfault.test a4c0bb8900b8dbf5fcbe41ee2a96148e22174bcb
+F test/pagerfault.test c1d176326ce244db157ce9c3ba128be2a9b172d6
 F test/pagerfault2.test 1f79ea40d1133b2683a2f811b00f2399f7ec2401
 F test/pageropt.test 8146bf448cf09e87bb1867c2217b921fb5857806
 F test/pagesize.test 76aa9f23ecb0741a4ed9d2e16c5fa82671f28efb
@@ -622,7 +619,7 @@ F test/tclsqlite.test 8c154101e704170c2be10f137a5499ac2c6da8d3
 F test/tempdb.test 800c36623d67a2ad1f58784b9c5644e0405af6e6
 F test/temptable.test f42121a0d29a62f00f93274464164177ab1cc24a
 F test/temptrigger.test b0273db072ce5f37cf19140ceb1f0d524bbe9f05
-F test/tester.tcl bc01480bbf2e948b52da8943fedc4237b0735961
+F test/tester.tcl 36552bcc93adb3a932a487da84da6597cdc5871b
 F test/thread001.test a3e6a7254d1cb057836cb3145b60c10bf5b7e60f
 F test/thread002.test afd20095e6e845b405df4f2c920cb93301ca69db
 F test/thread003.test b824d4f52b870ae39fc5bae4d8070eca73085dca
@@ -844,14 +841,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P 4e157b774764b8bafc9fabb88decf54f178b5ff5
-R 2ffda3ab686430275e530bf434e41e4c
-U drh
-Z 636446afbb2581f1ac8c757ae258a4e0
------BEGIN PGP SIGNATURE-----
-Version: GnuPG v1.4.6 (GNU/Linux)
-
-iD8DBQFMWFqkoxKgR168RlERAoOBAKCD0AqnZ6ZzbybLHgm4lZfoGX3cfgCfa6ef
-C79lcWSk6pzbtaW4+fqCLFQ=
-=jbsY
------END PGP SIGNATURE-----
+P 57c0960038b8ce97f9d6665f15e7f6ec310c681f
+R 2302fd10d4e5885f2536eafbb69bad6e
+U dan
+Z a94bacf2e85499d72182ad0845d48def
diff --git a/manifest.uuid b/manifest.uuid
index fce696df96..6b50305f08 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-57c0960038b8ce97f9d6665f15e7f6ec310c681f
\ No newline at end of file
+65b8636ac6e5d3e4502d4f576ddf9350d5df3022
\ No newline at end of file
diff --git a/src/btree.c b/src/btree.c
index c03d3c92b8..70b202692d 100644
--- a/src/btree.c
+++ b/src/btree.c
@@ -2569,13 +2569,27 @@ int sqlite3BtreeBeginTrans(Btree *p, int wrflag){
     if( p->inTrans>pBt->inTransaction ){
       pBt->inTransaction = p->inTrans;
     }
-#ifndef SQLITE_OMIT_SHARED_CACHE
     if( wrflag ){
+      MemPage *pPage1 = pBt->pPage1;
+#ifndef SQLITE_OMIT_SHARED_CACHE
       assert( !pBt->pWriter );
       pBt->pWriter = p;
       pBt->isExclusive = (u8)(wrflag>1);
-    }
 #endif
+
+      /* If the db-size header field is incorrect (as it may be if an old
+      ** client has been writing the database file), update it now. Doing
+      ** this sooner rather than later means the database size can safely 
+      ** re-read the database size from page 1 if a savepoint or transaction
+      ** rollback occurs within the transaction.
+      */
+      if( pBt->nPage!=get4byte(&pPage1->aData[28]) ){
+        rc = sqlite3PagerWrite(pPage1->pDbPage);
+        if( rc==SQLITE_OK ){
+          put4byte(&pPage1->aData[28], pBt->nPage);
+        }
+      }
+    }
   }
 
 
diff --git a/test/filefmt.test b/test/filefmt.test
index 28bc5fcc6f..16b459630c 100644
--- a/test/filefmt.test
+++ b/test/filefmt.test
@@ -117,5 +117,80 @@ ifcapable pager_pragmas {
   } {1 {file is encrypted or is not a database}}
 }
 
+#-------------------------------------------------------------------------
+# The following block of tests - filefmt-2.* - test that versions 3.7.0
+# and later can read and write databases that have been modified or created
+# by 3.6.23.1 and earlier. The difference difference is that 3.7.0 stores
+# the size of the database in the database file header, whereas 3.6.23.1
+# always derives this from the size of the file.
+#
+db close
+file delete -force test.db
+
+set a_string_counter 1
+proc a_string {n} {
+  incr ::a_string_counter
+  string range [string repeat "${::a_string_counter}." $n] 1 $n
+}
+sqlite3 db test.db
+db func a_string a_string
+
+do_execsql_test filefmt-2.1.1 {
+  PRAGMA page_size = 1024;
+  PRAGMA auto_vacuum = 0;
+  CREATE TABLE t1(a);
+  CREATE INDEX i1 ON t1(a);
+  INSERT INTO t1 VALUES(a_string(3000));
+  CREATE TABLE t2(a);
+  INSERT INTO t2 VALUES(1);
+} {}
+do_test filefmt-2.1.2 {
+  hexio_read test.db 28 4
+} {00000009}
+
+do_test filefmt-2.1.3 {
+  sql36231 { INSERT INTO t1 VALUES(a_string(3000)) }
+} {}
+
+do_execsql_test filefmt-2.1.4 { INSERT INTO t2 VALUES(2) } {}
+integrity_check filefmt-2.1.5
+do_test         filefmt-2.1.6 { hexio_read test.db 28 4 } {00000010}
+
+db close
+file delete -force test.db
+sqlite3 db test.db
+db func a_string a_string
+
+do_execsql_test filefmt-2.2.1 {
+  PRAGMA page_size = 1024;
+  PRAGMA auto_vacuum = 0;
+  CREATE TABLE t1(a);
+  CREATE INDEX i1 ON t1(a);
+  INSERT INTO t1 VALUES(a_string(3000));
+  CREATE TABLE t2(a);
+  INSERT INTO t2 VALUES(1);
+} {}
+do_test filefmt-2.2.2 {
+  hexio_read test.db 28 4
+} {00000009}
+
+do_test filefmt-2.2.3 {
+  sql36231 { INSERT INTO t1 VALUES(a_string(3000)) }
+} {}
+
+do_execsql_test filefmt-2.2.4 { 
+  PRAGMA integrity_check;
+  BEGIN;
+    INSERT INTO t2 VALUES(2);
+    SAVEPOINT a;
+      INSERT INTO t2 VALUES(3);
+    ROLLBACK TO a;
+} {ok}
+
+integrity_check filefmt-2.2.5
+do_execsql_test filefmt-2.2.6 { COMMIT } {}
+db close
+sqlite3 db test.db
+integrity_check filefmt-2.2.7
 
 finish_test
diff --git a/test/pagerfault.test b/test/pagerfault.test
index 89f5a11eb2..f9c82ddb60 100644
--- a/test/pagerfault.test
+++ b/test/pagerfault.test
@@ -1045,4 +1045,37 @@ ifcapable crashtest {
   }
 }
 
+
+#-------------------------------------------------------------------------
+# When a 3.7.0 client opens a write-transaction on a database file that
+# has been appended to or truncated by a pre-370 client, it updates
+# the db-size in the file header immediately. This test case provokes
+# errors during that operation.
+#
+do_test pagerfault-22-pre1 {
+  faultsim_delete_and_reopen
+  db func a_string a_string
+  execsql {
+    PRAGMA page_size = 1024;
+    PRAGMA auto_vacuum = 0;
+    CREATE TABLE t1(a);
+    CREATE INDEX i1 ON t1(a);
+    INSERT INTO t1 VALUES(a_string(3000));
+    CREATE TABLE t2(a);
+    INSERT INTO t2 VALUES(1);
+  }
+  db close
+  sql36231 { INSERT INTO t1 VALUES(a_string(3000)) }
+  faultsim_save_and_close
+} {}
+do_faultsim_test pagerfault-22 -prep {
+  faultsim_restore_and_reopen
+} -body {
+  execsql { INSERT INTO t2 VALUES(2) }
+  execsql { SELECT * FROM t2 }
+} -test {
+  faultsim_test_result {0 {1 2}}
+  faultsim_integrity_check
+}
+
 finish_test
diff --git a/test/tester.tcl b/test/tester.tcl
index f485a6de5b..e4193b48f8 100644
--- a/test/tester.tcl
+++ b/test/tester.tcl
@@ -1230,6 +1230,23 @@ proc slave_test_file {zFile} {
   show_memstats
 }
 
+# Open a new connection on database test.db and execute the SQL script
+# supplied as an argument. Before returning, close the new conection and
+# restore the 4 byte fields starting at header offsets 28, 92 and 96
+# to the values they held before the SQL was executed. This simulates
+# a write by a pre-3.7.0 client.
+#
+proc sql36231 {sql} {
+  set B [hexio_read test.db 92 8]
+  set A [hexio_read test.db 28 4]
+  sqlite3 db36231 test.db
+  catch { db36231 func a_string a_string }
+  execsql $sql db36231
+  db36231 close
+  hexio_write test.db 28 $A
+  hexio_write test.db 92 $B
+  return ""
+}
 
 # If the library is compiled with the SQLITE_DEFAULT_AUTOVACUUM macro set
 # to non-zero, then set the global variable $AUTOVACUUM to 1.