Do not allow the pagesize of :memory: databases to be changed. Silently

ignore PRAGMA page_size=N requests for :memory: databases.
Ticket #1144 and #1252. (CVS 2466)

FossilOrigin-Name: f29a1d882623d8ff14f35a302aef63a16388bcb3

manifest

@@ -1,5 +1,5 @@
-C Comment\schanges\sin\svdbeapi.c\s(CVS\s2465)
+C Do\snot\sallow\sthe\spagesize\sof\s:memory:\sdatabases\sto\sbe\schanged.\s\sSilently\nignore\sPRAGMA\spage_size=N\srequests\sfor\s:memory:\sdatabases.\nTicket\s#1144\sand\s#1252.\s(CVS\s2466)
-D 2005-05-20T19:36:01
+D 2005-05-20T20:01:56
 F Makefile.in 5c00d0037104de2a50ac7647a5f12769795957a3
 F Makefile.linux-gcc 06be33b2a9ad4f005a5f42b22c4a19dab3cbb5c7
 F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@@ -30,7 +30,7 @@ F sqlite3.pc.in 985b9bf34192a549d7d370e0f0b6b34a4f61369a
 F src/alter.c 9570af388bc99471ea6e1258817fbf06e3120030
 F src/attach.c 3615dbe960cbee4aa5ea300b8a213dad36527b0f
 F src/auth.c 18c5a0befe20f3a58a41e3ddd78f372faeeefe1f
-F src/btree.c 0d62614c54516222e639b30ab1cad37222d2dd70
+F src/btree.c 85ee452bf378f297054aded9ea6eaed846fa4855
 F src/btree.h 41a71ce027db9ddee72cb43df2316bbe3a1d92af
 F src/build.c 61a0beac459a495f05622132559926d88757e20c
 F src/date.c 2134ef4388256e8247405178df8a61bd60dc180a
@@ -52,8 +52,8 @@ F src/os_unix.c cb8a39901b8eb920372c2e42f7ea9ab40f2e47ae
 F src/os_unix.h 39a393252e69e72b06715c9958df05ddbc4aa971
 F src/os_win.c 2bbbe6fbb010763c3fa79d5e951afca9b138c6b5
 F src/os_win.h 41a946bea10f61c158ce8645e7646b29d44f122b
-F src/pager.c a48f537db37de0433fd1b527e64d08c1a5bcce19
+F src/pager.c d16a1499385e630396321e48fdebb8eb9f54f362
-F src/pager.h 94bb42704ae861036a3bf3bbbe04dd3f0c6a690d
+F src/pager.h 0d9153d6269d60d04af3dd84a0cc0a96253cf4a4
 F src/parse.y 3e314b3a96b199b0501ed426f2cee3392ffce806
 F src/pragma.c 93d447670b367e7aec9191ed952fe04f6a052eb5
 F src/printf.c 3d20b21cfecadacecac3fb7274e746cb81d3d357
@@ -170,7 +170,7 @@ F test/null.test 69c62daf1630bf54c87bbc7ef2e22012e58d6da8
 F test/pager.test 1579e8f07291ae8e24db62ffade5c101c3e76597
 F test/pager2.test 49c0f57c7da0b060f0486b85fdd074025caa694e
 F test/pager3.test 2323bf27fd5bd887b580247e5bce500ceee994b4
-F test/pagesize.test 1b826d1608fd86d2303aa895b5586052ad07eba1
+F test/pagesize.test cbc6a312b6f6c0f02619b189985df2a14164b690
 F test/pragma.test effcf2f0dea35223cbaa6bf40c47d0796ba39e40
 F test/printf.test 92ba4c510b4fc61120ffa4a01820446ed917ae57
 F test/progress.test 16496001da445e6534afb94562c286708316d82f x
@@ -279,7 +279,7 @@ F www/tclsqlite.tcl 425be741b8ae664f55cb1ef2371aab0a75109cf9
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl a99cf5f6d8bd4d5537584a2b342f0fb9fa601d8b
 F www/whentouse.tcl 528299b8316726dbcc5548e9aa0648c8b1bd055b
-P f5d9a8061a6d650f207669b121243abb8dd28be2
+P ab7805fb2fb29abc1311e23a93ba03883db7b30e
-R e99cd950c0217d760e240a513f735555
+R 02045e8d824498610299441d325bab9a
 U drh
-Z a74284c22e055fdde82da0a235079120
+Z 27e3fe2bf2728abf9eb44db83a10e0ac

manifest.uuid

@@ -1 +1 @@
-ab7805fb2fb29abc1311e23a93ba03883db7b30e
+f29a1d882623d8ff14f35a302aef63a16388bcb3

src/btree.c

@@ -9,7 +9,7 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** $Id: btree.c,v 1.259 2005/05/05 18:14:14 drh Exp $
+** $Id: btree.c,v 1.260 2005/05/20 20:01:56 drh Exp $
 **
 ** This file implements a external (disk-based) database using BTrees.
 ** For a detailed discussion of BTrees, refer to
@@ -1362,8 +1362,7 @@ int sqlite3BtreeSetPageSize(Btree *pBt, int pageSize, int nReserve){
   if( pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE &&
         ((pageSize-1)&pageSize)==0 ){
     assert( (pageSize & 7)==0 );
-    pBt->pageSize = pageSize;
+    pBt->pageSize = sqlite3pager_set_pagesize(pBt->pPager, pageSize);
-    sqlite3pager_set_pagesize(pBt->pPager, pageSize);
   }
   pBt->usableSize = pBt->pageSize - nReserve;
   return SQLITE_OK;

src/pager.c

@@ -18,7 +18,7 @@
 ** file simultaneously, or one process from reading the database while
 ** another is writing.
 **
-** @(#) $Id: pager.c,v 1.202 2005/04/28 17:18:48 drh Exp $
+** @(#) $Id: pager.c,v 1.203 2005/05/20 20:01:56 drh Exp $
 */
 #ifndef SQLITE_OMIT_DISKIO
 #include "sqliteInt.h"
@@ -172,7 +172,7 @@ struct PgHdr {
 #ifdef SQLITE_CHECK_PAGES
   u32 pageHash;
 #endif
-  /* pPager->psAligned bytes of page data follow this header */
+  /* pPager->pageSize bytes of page data follow this header */
   /* Pager.nExtra bytes of local data follow the page data */
 };
 
@@ -208,9 +208,9 @@ struct PgHistory {
 */
 #define PGHDR_TO_DATA(P)  ((void*)(&(P)[1]))
 #define DATA_TO_PGHDR(D)  (&((PgHdr*)(D))[-1])
-#define PGHDR_TO_EXTRA(G,P) ((void*)&((char*)(&(G)[1]))[(P)->psAligned])
+#define PGHDR_TO_EXTRA(G,P) ((void*)&((char*)(&(G)[1]))[(P)->pageSize])
 #define PGHDR_TO_HIST(P,PGR)  \
-            ((PgHistory*)&((char*)(&(P)[1]))[(PGR)->psAligned+(PGR)->nExtra])
+            ((PgHistory*)&((char*)(&(P)[1]))[(PGR)->pageSize+(PGR)->nExtra])
 
 /*
 ** How big to make the hash table used for locating in-memory pages
@@ -250,7 +250,6 @@ struct Pager {
   void (*xDestructor)(void*,int); /* Call this routine when freeing pages */
   void (*xReiniter)(void*,int);   /* Call this routine when reloading pages */
   int pageSize;               /* Number of bytes in a page */
-  int psAligned;              /* pageSize rounded up to a multiple of 8 */
   int nPage;                  /* Total number of in-memory pages */
   int nMaxPage;               /* High water mark of nPage */
   int nRef;                   /* Number of in-memory pages with PgHdr.nRef>0 */
@@ -1660,7 +1659,6 @@ int sqlite3pager_open(
   pPager->nRef = 0;
   pPager->dbSize = memDb-1;
   pPager->pageSize = SQLITE_DEFAULT_PAGE_SIZE;
-  pPager->psAligned = FORCE_ALIGNMENT(pPager->pageSize);
   pPager->stmtSize = 0;
   pPager->stmtJSize = 0;
   pPager->nPage = 0;
@@ -1716,14 +1714,16 @@ void sqlite3pager_set_reiniter(Pager *pPager, void (*xReinit)(void*,int)){
 }
 
 /*
-** Set the page size.
+** Set the page size.  Return the new size.  If the suggest new page
-**
+** size is inappropriate, then an alternative page size is selected
-** The page size must only be changed when the cache is empty.
+** and returned.
 */
-void sqlite3pager_set_pagesize(Pager *pPager, int pageSize){
+int sqlite3pager_set_pagesize(Pager *pPager, int pageSize){
   assert( pageSize>=512 && pageSize<=SQLITE_MAX_PAGE_SIZE );
-  pPager->pageSize = pageSize;
+  if( !pPager->memDb ){
-  pPager->psAligned = FORCE_ALIGNMENT(pageSize);
+    pPager->pageSize = pageSize;
+  }
+  return pPager->pageSize;
 }
 
 /*
@@ -2376,7 +2376,7 @@ int sqlite3pager_get(Pager *pPager, Pgno pgno, void **ppPage){
     pPager->nMiss++;
     if( pPager->nPage<pPager->mxPage || pPager->pFirst==0 || MEMDB ){
       /* Create a new page */
-      pPg = sqliteMallocRaw( sizeof(*pPg) + pPager->psAligned
+      pPg = sqliteMallocRaw( sizeof(*pPg) + pPager->pageSize
                               + sizeof(u32) + pPager->nExtra
                               + MEMDB*sizeof(PgHistory) );
       if( pPg==0 ){

src/pager.h

@@ -13,7 +13,7 @@
 ** subsystem.  The page cache subsystem reads and writes a file a page
 ** at a time and provides a journal for rollback.
 **
-** @(#) $Id: pager.h,v 1.43 2005/03/31 21:02:46 drh Exp $
+** @(#) $Id: pager.h,v 1.44 2005/05/20 20:01:56 drh Exp $
 */
 
 /*
@@ -71,7 +71,7 @@ int sqlite3pager_open(Pager **ppPager, const char *zFilename,
 void sqlite3pager_set_busyhandler(Pager*, BusyHandler *pBusyHandler);
 void sqlite3pager_set_destructor(Pager*, void(*)(void*,int));
 void sqlite3pager_set_reiniter(Pager*, void(*)(void*,int));
-void sqlite3pager_set_pagesize(Pager*, int);
+int sqlite3pager_set_pagesize(Pager*, int);
 void sqlite3pager_read_fileheader(Pager*, int, unsigned char*);
 void sqlite3pager_set_cachesize(Pager*, int);
 int sqlite3pager_close(Pager *pPager);

test/pagesize.test

@@ -11,7 +11,7 @@
 # This file implements regression tests for SQLite library.
 # This file implements tests for the page_size PRAGMA.
 #
-# $Id: pagesize.test,v 1.9 2004/11/23 10:52:51 danielk1977 Exp $
+# $Id: pagesize.test,v 1.10 2005/05/20 20:01:56 drh Exp $
 
 
 set testdir [file dirname $argv0]
@@ -75,6 +75,12 @@ do_test pagesize-1.8 {
 } 8192
 
 foreach PGSZ {512 2048 4096 8192} {
+  do_test pagesize-2.$PGSZ.0 {
+    db close
+    sqlite3 db :memory:
+    execsql "PRAGMA page_size=$PGSZ;"
+    execsql {PRAGMA page_size}
+  } 1024
   do_test pagesize-2.$PGSZ.1 {
     db close
     file delete -force test.db