When moving pages as part of autovacuum on an in-memory database, make sure

that the source location is journalled so that a ROLLBACK can occur.
Part of the fix for ticket [564d412f15a00]

FossilOrigin-Name: 2f42f91fe65b0b21671936013df08037091f0cc6

manifest

@@ -1,5 +1,8 @@
-C Merge\sleaf\saccidentally\screated\sby\s[1c4984c62f].
-D 2009-11-20T10:23:13
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA1
+
+C When\smoving\spages\sas\spart\sof\sautovacuum\son\san\sin-memory\sdatabase,\smake\ssure\nthat\sthe\ssource\slocation\sis\sjournalled\sso\sthat\sa\sROLLBACK\scan\soccur.\nPart\sof\sthe\sfix\sfor\sticket\s[564d412f15a00]
+D 2009-11-20T18:48:36
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in 7f6c6aa7feeeb5e26e01b344161d9aa1b5d64177
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -150,7 +153,7 @@ F src/os_common.h 240c88b163b02c21a9f21f87d49678a0aa21ff30
 F src/os_os2.c 75a8c7b9a00a2cf1a65f9fa4afbc27d46634bb2f
 F src/os_unix.c bdd6ca0932dcb51c344081aff430bcc71c14db7f
 F src/os_win.c 5ffab20249a61e0625f869efe157fa009747039b
-F src/pager.c 4adc8baf93d50aa8e567173d27a37ff103106dab
+F src/pager.c 3c408c646d2a4adba5aedde9862ef69a27be68d8
 F src/pager.h 1b32faf2e578ac3e7bcf9c9d11217128261c5c54
 F src/parse.y f785d814562a14dc19202f61abb4372845f64752
 F src/pcache.c 3b079306376e0e04c0d3df40c0a4b750a1839310
@@ -772,7 +775,14 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
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manifest.uuid

@@ -1 +1 @@
-cae949ce971ca216e0f8880b2f93866619fa05be
+2f42f91fe65b0b21671936013df08037091f0cc6

src/pager.c

@@ -5101,6 +5101,14 @@ int sqlite3PagerMovepage(Pager *pPager, DbPage *pPg, Pgno pgno, int isCommit){
 
   assert( pPg->nRef>0 );
 
+  /* In order to be able to rollback, an in-memory database must journal
+  ** the page we are moving from.
+  */
+  if( MEMDB ){
+    rc = sqlite3PagerWrite(pPg);
+    if( rc ) return rc;
+  }
+
   /* If the page being moved is dirty and has not been saved by the latest
   ** savepoint, then save the current contents of the page into the 
   ** sub-journal now. This is required to handle the following scenario:
@@ -5119,7 +5127,7 @@ int sqlite3PagerMovepage(Pager *pPager, DbPage *pPg, Pgno pgno, int isCommit){
   ** one or more savepoint bitvecs. This is the reason this function
   ** may return SQLITE_NOMEM.
   */
-  if( pPg->flags&PGHDR_DIRTY 
+  if( pPg->flags&PGHDR_DIRTY
    && subjRequiresPage(pPg)
    && SQLITE_OK!=(rc = subjournalPage(pPg))
   ){