diff --git a/manifest b/manifest
index c85376b665..5a1ef56a4d 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Increase\sthe\smaximum\spage\ssize\sfrom\s32k\sto\s64k.
-D 2010-08-12T02:41:12
+C Add\scoverage\stests\sfor\spager.c.
+D 2010-08-12T11:25:48
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in ec08dc838fd8110fe24c92e5130bcd91cbb1ff2e
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -156,7 +156,7 @@ F src/os_common.h a8f95b81eca8a1ab8593d23e94f8a35f35d4078f
 F src/os_os2.c 72d0b2e562952a2464308c4ce5f7913ac10bef3e
 F src/os_unix.c 11194cbcf6a57456e58022dc537ab8c3497d9bb9
 F src/os_win.c 51cb62f76262d961ea4249489383d714501315a7
-F src/pager.c 39be42c3234a4ea51ddf185a47a91f31a0439fd1
+F src/pager.c ff51a76c802c51dc5b36645a2d9202d2a9462897
 F src/pager.h 985a83d35b0cfa8e1c23ef91ed5cdb9bde73695a
 F src/parse.y 12b7ebd61ea54f0e1b1083ff69cc2c8ce9353d58
 F src/pcache.c 1e9aa2dbc0845b52e1b51cc39753b6d1e041cb07
@@ -222,7 +222,7 @@ F src/vdbe.c 66c262a923915e596379b1d597178e04c5d719e4
 F src/vdbe.h 4de0efb4b0fdaaa900cf419b35c458933ef1c6d2
 F src/vdbeInt.h ffd68c4d4229227a5089bec53a1c635146177abc
 F src/vdbeapi.c d0f4407e465f261780ad725c1caece7d66a6aa35
-F src/vdbeaux.c e18a42d0bdac405565f2d258a82457fd10db133d
+F src/vdbeaux.c c73bcefcebfd3d2cf91bf6a41ef0fb0d884814c6
 F src/vdbeblob.c 258a6010ba7a82b72b327fb24c55790655689256
 F src/vdbemem.c e5673f81a2381b35c60e73ef0a8502be2ab1041e
 F src/vdbetrace.c 864cef96919323482ebd9986f2132435115e9cc2
@@ -489,7 +489,7 @@ F test/lock4.test c82268c031d39345d05efa672f80b025481b3ae5
 F test/lock5.test b2abb5e711bc59b0eae00f6c97a36ec9f458fada
 F test/lock6.test 8df56060f396151777390982422c800d026e1722
 F test/lock7.test 64006c84c1c616657e237c7ad6532b765611cf64
-F test/lock_common.tcl e7013c6208f5fa818735c324eb0249b4c0f317cf
+F test/lock_common.tcl 57727421a6a850443944cbadfdf5a6dd9e4ac81c
 F test/lookaside.test 382e7bc2fab23d902c8eafb1b9ed7ababfff75a6
 F test/main.test 9d7bbfcc1b52c88ba7b2ba6554068ecf9939f252
 F test/make-where7.tcl 05c16b5d4f5d6512881dfec560cb793915932ef9
@@ -539,10 +539,10 @@ F test/notify3.test d60923e186e0900f4812a845fcdfd8eea096e33a
 F test/notnull.test cc7c78340328e6112a13c3e311a9ab3127114347
 F test/null.test a8b09b8ed87852742343b33441a9240022108993
 F test/openv2.test af02ed0a9cbc0d2a61b8f35171d4d117e588e4ec
-F test/pager1.test 9a7650f95bc84ef2fa4c2db87f9676d2641f9829
-F test/pager2.test 9edc1584cbc8ecd3b34dbcc8e86467bf05caa27f
+F test/pager1.test 8b6e57d8cdf4c9f5c31ddcd048e81b026b225f0c
+F test/pager2.test 0fbb6b6dc40ce1fecfe758c555a748ad2e9beaa3
 F test/pager3.test 3856d9c80839be0668efee1b74811b1b7f7fc95f
-F test/pagerfault.test 495ab0a0ed30aebe7e4278fcee148986085d4c8b
+F test/pagerfault.test c08abb54b591ba704c913af9278428fa3cce42d5
 F test/pagerfault2.test 1f79ea40d1133b2683a2f811b00f2399f7ec2401
 F test/pageropt.test 8146bf448cf09e87bb1867c2217b921fb5857806
 F test/pagesize.test 76aa9f23ecb0741a4ed9d2e16c5fa82671f28efb
@@ -843,7 +843,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P 2fa05d01b6b11788a5b73d203fcac9d4a4ba9fd8
-R 68189c2924cc1a955c4daa7396f7f071
-U drh
-Z ea2561c5cb1a509ae1c92e5b10fbf288
+P 45362437d491fbe0f033a67b398f8ba68cbf1b3b
+R 38d53c0088d37a8bc9ce3834465ac451
+U dan
+Z ebb8f906eccfa5df91e15cf73afafb56
diff --git a/manifest.uuid b/manifest.uuid
index fe0d59964d..c33d8e70ba 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-45362437d491fbe0f033a67b398f8ba68cbf1b3b
\ No newline at end of file
+228c5b16af80c22e97d9d4deb351e0d3f4523f89
\ No newline at end of file
diff --git a/src/pager.c b/src/pager.c
index 12f45b5c18..3a7afd17cf 100644
--- a/src/pager.c
+++ b/src/pager.c
@@ -4126,7 +4126,7 @@ static int pagerStress(void *p, PgHdr *pPg){
     sqlite3PcacheMakeClean(pPg);
   }
 
-  return pager_error(pPager, rc);
+  return pager_error(pPager, rc); 
 }
 
 
@@ -5701,9 +5701,6 @@ int sqlite3PagerCommitPhaseOne(
       ** that it took at the start of the transaction. Otherwise, the
       ** calls to sqlite3PagerGet() return zeroed pages instead of 
       ** reading data from the database file.
-      **
-      ** When journal_mode==OFF the dbOrigSize is always zero, so this
-      ** block never runs if journal_mode=OFF.
       */
   #ifndef SQLITE_OMIT_AUTOVACUUM
       if( pPager->dbSize<pPager->dbOrigSize 
@@ -6425,6 +6422,7 @@ int sqlite3PagerSetJournalMode(Pager *pPager, int eMode){
       }else{
         int rc = SQLITE_OK;
         int state = pPager->eState;
+        assert( state==PAGER_OPEN || state==PAGER_READER );
         if( state==PAGER_OPEN ){
           rc = sqlite3PagerSharedLock(pPager);
         }
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index 7729a85d45..5a4ad84975 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -2061,8 +2061,17 @@ int sqlite3VdbeHalt(Vdbe *p){
     isSpecialError = mrc==SQLITE_NOMEM || mrc==SQLITE_IOERR
                      || mrc==SQLITE_INTERRUPT || mrc==SQLITE_FULL;
     if( isSpecialError ){
-      /* If the query was read-only, we need do no rollback at all. Otherwise,
-      ** proceed with the special handling.
+      /* If the query was read-only and the error code is SQLITE_INTERRUPT, 
+      ** no rollback is necessary. Otherwise, at least a savepoint 
+      ** transaction must be rolled back to restore the database to a 
+      ** consistent state.
+      **
+      ** Even if the statement is read-only, it is important to perform
+      ** a statement or transaction rollback operation. If the error 
+      ** occured while writing to the journal, sub-journal or database
+      ** file as part of an effort to free up cache space (see function
+      ** pagerStress() in pager.c), the rollback is required to restore 
+      ** the pager to a consistent state.
       */
       if( !p->readOnly || mrc!=SQLITE_INTERRUPT ){
         if( (mrc==SQLITE_NOMEM || mrc==SQLITE_FULL) && p->usesStmtJournal ){
diff --git a/test/lock_common.tcl b/test/lock_common.tcl
index 4fe08e0882..b2ff76fdb2 100644
--- a/test/lock_common.tcl
+++ b/test/lock_common.tcl
@@ -27,6 +27,8 @@ proc do_multiclient_test {varname script} {
     set tn 2
   }] {
     faultsim_delete_and_reopen
+
+    proc code1 {tcl} { uplevel #0 $tcl }
   
     # Open connections [db2] and [db3]. Depending on which iteration this
     # is, the connections may be created in this interpreter, or in 
diff --git a/test/pager1.test b/test/pager1.test
index 9ddc6987cb..e469caf3d2 100644
--- a/test/pager1.test
+++ b/test/pager1.test
@@ -15,7 +15,7 @@ source $testdir/tester.tcl
 source $testdir/lock_common.tcl
 source $testdir/malloc_common.tcl
 source $testdir/wal_common.tcl
- 
+
 # Do not use a codec for tests in this file, as the database file is
 # manipulated directly using tcl scripts (using the [hexio_write] command).
 #
@@ -2273,4 +2273,60 @@ do_multiclient_test tn {
     sql1 { INSERT INTO t1 VALUES('c', 'd'); COMMIT }
   } {}
 }
+
+#-------------------------------------------------------------------------
+# Normally, when changing from journal_mode=PERSIST to DELETE the pager
+# attempts to delete the journal file. However, if it cannot obtain a
+# RESERVED lock on the database file, this step is skipped.
+#
+do_multiclient_test tn {
+  do_test pager1-28.$tn.1 {
+    sql1 { 
+      PRAGMA journal_mode = PERSIST;
+      CREATE TABLE t1(a, b);
+      INSERT INTO t1 VALUES('a', 'b');
+    }
+  } {persist}
+  do_test pager1-28.$tn.2 { file exists test.db-journal } 1
+  do_test pager1-28.$tn.3 { sql1 { PRAGMA journal_mode = DELETE } } delete
+  do_test pager1-28.$tn.4 { file exists test.db-journal } 0
+
+  do_test pager1-28.$tn.5 {
+    sql1 { 
+      PRAGMA journal_mode = PERSIST;
+      INSERT INTO t1 VALUES('c', 'd');
+    }
+  } {persist}
+  do_test pager1-28.$tn.6 { file exists test.db-journal } 1
+  do_test pager1-28.$tn.7 {
+    sql2 { BEGIN; INSERT INTO t1 VALUES('e', 'f'); }
+  } {}
+  do_test pager1-28.$tn.8  { file exists test.db-journal } 1
+  do_test pager1-28.$tn.9  { sql1 { PRAGMA journal_mode = DELETE } } delete
+  do_test pager1-28.$tn.10 { file exists test.db-journal } 1
+
+  do_test pager1-28.$tn.11 { sql2 COMMIT } {}
+  do_test pager1-28.$tn.12 { file exists test.db-journal } 0
+
+  do_test pager1-28-$tn.13 {
+    code1 { set channel [db incrblob -readonly t1 a 2] }
+    sql1 {
+      PRAGMA journal_mode = PERSIST;
+      INSERT INTO t1 VALUES('g', 'h');
+    }
+  } {persist}
+  do_test pager1-28.$tn.14 { file exists test.db-journal } 1
+  do_test pager1-28.$tn.15 {
+    sql2 { BEGIN; INSERT INTO t1 VALUES('e', 'f'); }
+  } {}
+  do_test pager1-28.$tn.16 { sql1 { PRAGMA journal_mode = DELETE } } delete
+  do_test pager1-28.$tn.17 { file exists test.db-journal } 1
+
+  do_test pager1-28.$tn.17 { csql2 { COMMIT } } {1 {database is locked}}
+  do_test pager1-28-$tn.18 { code1 { read $channel } } c
+  do_test pager1-28-$tn.19 { code1 { close $channel } } {}
+  do_test pager1-28.$tn.20 { sql2 { COMMIT } } {}
+}
+
+
 finish_test
diff --git a/test/pager2.test b/test/pager2.test
index 780aec5274..06389f5d9f 100644
--- a/test/pager2.test
+++ b/test/pager2.test
@@ -118,9 +118,11 @@ tv delete
 
 
 #-------------------------------------------------------------------------
-# Test a ROLLBACK with journal_mode=off.
 #
-breakpoint
+# pager2-2.1: Test a ROLLBACK with journal_mode=off.
+# pager2-2.2: Test shrinking the database (auto-vacuum) with 
+#             journal_mode=off
+#
 do_test pager2-2.1 {
   faultsim_delete_and_reopen
   execsql {
@@ -132,5 +134,18 @@ do_test pager2-2.1 {
     SELECT * FROM t1;
   }
 } {off 1 2}
+do_test pager2-2.2 {
+  faultsim_delete_and_reopen
+  execsql {
+    PRAGMA auto_vacuum = incremental;
+    PRAGMA page_size = 1024;
+    PRAGMA journal_mode = off;
+    CREATE TABLE t1(a, b);
+    INSERT INTO t1 VALUES(zeroblob(5000), zeroblob(5000));
+    DELETE FROM t1;
+    PRAGMA incremental_vacuum;
+  }
+  file size test.db
+} {3072}
 
 finish_test
diff --git a/test/pagerfault.test b/test/pagerfault.test
index 363bc3b7fa..521e76b727 100644
--- a/test/pagerfault.test
+++ b/test/pagerfault.test
@@ -28,6 +28,8 @@ proc a_string {n} {
 }
 db func a_string a_string
 
+if 1 {
+
 #-------------------------------------------------------------------------
 # Test fault-injection while rolling back a hot-journal file.
 #
@@ -1117,11 +1119,54 @@ do_faultsim_test pagerfault-24 -prep {
 } -body {
   execsql { CREATE TEMP TABLE t1(a, b) }
 } -test {
-  faultsim_test_result {0 {}} {1 {unable to open a temporary database file for storing temporary tables}}
+  faultsim_test_result {0 {}} \
+    {1 {unable to open a temporary database file for storing temporary tables}}
   set ic [db eval { PRAGMA temp.integrity_check }]
   if {$ic != "ok"} { error "Integrity check: $ic" }
 }
 
+}
+
+proc lockrows {n} {
+  if {$n==0} { return "" }
+  db eval { SELECT * FROM t1 WHERE oid = $n } { 
+    return [lockrows [expr {$n-1}]]
+  }
+}
+
+do_test pagerfault-25-pre1 {
+  faultsim_delete_and_reopen
+  db func a_string a_string
+  execsql {
+    PRAGMA page_size = 1024;
+    PRAGMA auto_vacuum = 0;
+    CREATE TABLE t1(a);
+    INSERT INTO t1 VALUES(a_string(500));
+    INSERT INTO t1 SELECT a_string(500) FROM t1;
+    INSERT INTO t1 SELECT a_string(500) FROM t1;
+    INSERT INTO t1 SELECT a_string(500) FROM t1;
+    INSERT INTO t1 SELECT a_string(500) FROM t1;
+    INSERT INTO t1 SELECT a_string(500) FROM t1;
+  }
+  faultsim_save_and_close
+} {}
+do_faultsim_test pagerfault-25 -faults full -prep {
+  faultsim_restore_and_reopen
+  db func a_string a_string
+  set ::channel [db incrblob -readonly t1 a 1]
+  execsql { 
+    PRAGMA cache_size = 10;
+    BEGIN;
+      INSERT INTO t1 VALUES(a_string(3000));
+      INSERT INTO t1 VALUES(a_string(3000));
+  }
+} -body {
+  lockrows 30
+} -test {
+  catch { lockrows 30 }
+  close $::channel
+  faultsim_test_result {0 {}} 
+}
 
 
 finish_test