Continuing refinements to the filesize-in-header enhancement.

FossilOrigin-Name: 79e22b95038c50b9b7f35e09262805ff6338b59b

manifest

@@ -1,8 +1,8 @@
 -----BEGIN PGP SIGNED MESSAGE-----
 Hash: SHA1
 
-C Add\sa\sNEVER\smacro\saround\sa\stest\sin\sbtree.c\sthat\scan\snot\slonger\sbe\strue.
-D 2010-03-30T15:51:13
+C Continuing\srefinements\sto\sthe\sfilesize-in-header\senhancement.
+D 2010-03-30T22:58:34
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in 4f2f967b7e58a35bb74fb7ec8ae90e0f4ca7868b
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -109,11 +109,11 @@ F src/alter.c e6f4d11b1c0b23642fc46bac9abe0753c4294e05
 F src/analyze.c 8dfd781ac326496746ecdfc3e099250ed5d79be5
 F src/attach.c 7abe1607c2054585377cdba3c219e8572f84ca5e
 F src/auth.c 523da7fb4979469955d822ff9298352d6b31de34
-F src/backup.c b293534bc2df23c57668a585b17ee7faaaef0939
+F src/backup.c e86634da8c48357a759694c9c7c471125cd8d5a8
 F src/bitvec.c 06ad2c36a9c3819c0b9cbffec7b15f58d5d834e0
 F src/btmutex.c 96a12f50f7a17475155971a241d85ec5171573ff
-F src/btree.c dc9dc08fcc61f65cd7d85d85fc08905475eea406
-F src/btree.h 0e193b7e90f1d78b79c79474040e3d66a553a4fa
+F src/btree.c d3a0ee18bd4aa2339e9cf2f7d93f67b022b4670b
+F src/btree.h ad6cff92286f9b02ec32f0b97136e9a544249f37
 F src/btreeInt.h 22447d259639271774a931cbf66aa55112846681
 F src/build.c 11100b66fb97638d2d874c1d34d8db90650bb1d7
 F src/callback.c 908f3e0172c3d4058f4ca0acd42c637c52e9669f
@@ -155,7 +155,7 @@ F src/os_common.h 240c88b163b02c21a9f21f87d49678a0aa21ff30
 F src/os_os2.c 75a8c7b9a00a2cf1a65f9fa4afbc27d46634bb2f
 F src/os_unix.c 148d2f625db3727250c0b880481ae7630b6d0eb0
 F src/os_win.c 1c7453c2df4dab26d90ff6f91272aea18bcf7053
-F src/pager.c af1c58b7b884839853cc553681f771297de56049
+F src/pager.c 0fcd5b4359a0c1fcf06b705a5060ad7597802082
 F src/pager.h ef8a2cf10084f60ab45ee2dfded8bf8b0c655ddf
 F src/parse.y ace5c7a125d9f2a410e431ee3209034105045f7e
 F src/pcache.c ace8f6a5ecd4711cc66a1b23053be7109bd437cf
@@ -214,7 +214,7 @@ F src/update.c c0dc6b75ad28b76b619042d934f337b02acee208
 F src/utf.c 1baeeac91707a4df97ccc6141ec0f808278af685
 F src/util.c 32aebf04c10e51ad3977a928b7416bed671b620b
 F src/vacuum.c b1d542c8919d4d11119f78069e1906a1ad07e0ee
-F src/vdbe.c 8acca6dab2505e9650f6f014ada6ef30570cba99
+F src/vdbe.c afd58607e70bca91da8c5f9effeef0065862d0d0
 F src/vdbe.h 471f6a3dcec4817ca33596fe7f6654d56c0e75f3
 F src/vdbeInt.h ae1e6ba0dd3fb4a886898d2829d748be701b01f8
 F src/vdbeapi.c 74c25680046a116b24b95393914d3669c23305dc
@@ -239,7 +239,7 @@ F test/analyze3.test 506203875258ffd8ffa879b9c3c5432022d2b6d8
 F test/async.test 8c75d31b8330f8b70cf2571b014d4476a063efdb
 F test/async2.test bf5e2ca2c96763b4cba3d016249ad7259a5603b6
 F test/async3.test 93edaa9122f498e56ea98c36c72abc407f4fb11e
-F test/async4.test aafa6328c559d3e4bb587de770cbdecfca06f0da
+F test/async4.test 166cc07057ff6f908fe42dcffaa8ca732c757acb
 F test/async5.test f3592d79c84d6e83a5f50d3fd500445f7d97dfdf
 F test/attach.test ce9660e51768fab93cf129787be886c5d6c4fd81
 F test/attach2.test a295d2d7061adcee5884ef4a93c7c96a82765437
@@ -797,14 +797,14 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P ca359a3e8048bd11605c41c4b48134c0343e543b
-R 32ec8ae8b71a3dfac8895cb995707072
+P c117f99236a009778bb7878da464918554391f0a
+R efa6bf51e48ad2d5be1cf09661f1f24c
 U drh
-Z b60f084ae0f371ea36d8a15f0b37127b
+Z b0d1f74939d4990ca433eff4c752959f
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manifest.uuid

@@ -1 +1 @@
-c117f99236a009778bb7878da464918554391f0a
+79e22b95038c50b9b7f35e09262805ff6338b59b

src/backup.c

@@ -331,9 +331,8 @@ int sqlite3_backup_step(sqlite3_backup *p, int nPage){
     /* Now that there is a read-lock on the source database, query the
     ** source pager for the number of pages in the database.
     */
-    if( rc==SQLITE_OK ){
-      rc = sqlite3PagerPagecount(pSrcPager, &nSrcPage);
-    }
+    nSrcPage = (int)sqlite3BtreeLastPage(p->pSrc);
+    assert( nSrcPage>=0 );
     for(ii=0; (nPage<0 || ii<nPage) && p->iNext<=(Pgno)nSrcPage && !rc; ii++){
       const Pgno iSrcPg = p->iNext;                 /* Source page number */
       if( iSrcPg!=PENDING_BYTE_PAGE(p->pSrc->pBt) ){

src/btree.c

@@ -1560,9 +1560,13 @@ static MemPage *btreePageLookup(BtShared *pBt, Pgno pgno){
 ** Return the size of the database file in pages. If there is any kind of
 ** error, return ((unsigned int)-1).
 */
-static Pgno pagerPagecount(BtShared *pBt){
-  int nPage = (int)pBt->nPage;
-  return nPage;
+static Pgno btreePagecount(BtShared *pBt){
+  return pBt->nPage;
+}
+u32 sqlite3BtreeLastPage(Btree *p){
+  assert( sqlite3BtreeHoldsMutex(p) );
+  assert( ((p->pBt->nPage)&0x8000000)==0 );
+  return (int)btreePagecount(p->pBt);
 }
 
 /*
@@ -1579,7 +1583,7 @@ static int getAndInitPage(
   MemPage **ppPage     /* Write the page pointer here */
 ){
   int rc;
-  TESTONLY( Pgno iLastPg = pagerPagecount(pBt); )
+  TESTONLY( Pgno iLastPg = btreePagecount(pBt); )
   assert( sqlite3_mutex_held(pBt->mutex) );
 
   rc = btreeGetPage(pBt, pgno, ppPage, 0);
@@ -2881,7 +2885,7 @@ int sqlite3BtreeIncrVacuum(Btree *p){
     rc = SQLITE_DONE;
   }else{
     invalidateAllOverflowCache(pBt);
-    rc = incrVacuumStep(pBt, 0, pagerPagecount(pBt));
+    rc = incrVacuumStep(pBt, 0, btreePagecount(pBt));
     if( rc==SQLITE_OK ){
       rc = sqlite3PagerWrite(pBt->pPage1->pDbPage);
       put4byte(&pBt->pPage1->aData[28], pBt->nPage);
@@ -2916,7 +2920,7 @@ static int autoVacuumCommit(BtShared *pBt){
     int nEntry;        /* Number of entries on one ptrmap page */
     Pgno nOrig;        /* Database size before freeing */
 
-    nOrig = pagerPagecount(pBt);
+    nOrig = btreePagecount(pBt);
     if( PTRMAP_ISPAGE(pBt, nOrig) || nOrig==PENDING_BYTE_PAGE(pBt) ){
       /* It is not possible to create a database for which the final page
       ** is either a pointer-map page or the pending-byte page. If one
@@ -3333,7 +3337,7 @@ static int btreeCursor(
   if( NEVER(wrFlag && pBt->readOnly) ){
     return SQLITE_READONLY;
   }
-  if( iTable==1 && pagerPagecount(pBt)==0 ){
+  if( iTable==1 && btreePagecount(pBt)==0 ){
     return SQLITE_EMPTY;
   }
 
@@ -3604,7 +3608,7 @@ static int getOverflowPage(
       iGuess++;
     }
 
-    if( iGuess<=pagerPagecount(pBt) ){
+    if( iGuess<=btreePagecount(pBt) ){
       rc = ptrmapGet(pBt, iGuess, &eType, &pgno);
       if( rc==SQLITE_OK && eType==PTRMAP_OVERFLOW2 && pgno==ovfl ){
         next = iGuess;
@@ -4636,7 +4640,7 @@ static int allocateBtreePage(
 
   assert( sqlite3_mutex_held(pBt->mutex) );
   pPage1 = pBt->pPage1;
-  mxPage = pagerPagecount(pBt);
+  mxPage = btreePagecount(pBt);
   n = get4byte(&pPage1->aData[36]);
   testcase( n==mxPage-1 );
   if( n>=mxPage ){
@@ -5050,7 +5054,7 @@ static int clearCell(MemPage *pPage, unsigned char *pCell){
   while( nOvfl-- ){
     Pgno iNext = 0;
     MemPage *pOvfl = 0;
-    if( ovflPgno<2 || ovflPgno>pagerPagecount(pBt) ){
+    if( ovflPgno<2 || ovflPgno>btreePagecount(pBt) ){
       /* 0 is not a legal page number and page 1 cannot be an 
       ** overflow page. Therefore if ovflPgno<2 or past the end of the 
       ** file the database must be corrupt. */
@@ -6929,7 +6933,7 @@ static int clearDatabasePage(
   int i;
 
   assert( sqlite3_mutex_held(pBt->mutex) );
-  if( pgno>pagerPagecount(pBt) ){
+  if( pgno>btreePagecount(pBt) ){
     return SQLITE_CORRUPT_BKPT;
   }
 
@@ -7680,7 +7684,7 @@ char *sqlite3BtreeIntegrityCheck(
   nRef = sqlite3PagerRefcount(pBt->pPager);
   sCheck.pBt = pBt;
   sCheck.pPager = pBt->pPager;
-  sCheck.nPage = pagerPagecount(sCheck.pBt);
+  sCheck.nPage = btreePagecount(sCheck.pBt);
   sCheck.mxErr = mxErr;
   sCheck.nErr = 0;
   sCheck.mallocFailed = 0;

src/btree.h

@@ -81,6 +81,7 @@ int sqlite3BtreeSyncDisabled(Btree*);
 int sqlite3BtreeSetPageSize(Btree *p, int nPagesize, int nReserve, int eFix);
 int sqlite3BtreeGetPageSize(Btree*);
 int sqlite3BtreeMaxPageCount(Btree*,int);
+u32 sqlite3BtreeLastPage(Btree*);
 int sqlite3BtreeSecureDelete(Btree*,int);
 int sqlite3BtreeGetReserve(Btree*);
 int sqlite3BtreeSetAutoVacuum(Btree *, int);

src/pager.c

@@ -1123,8 +1123,9 @@ static void pager_unlock(Pager *pPager){
 
     /* If the file is unlocked, somebody else might change it. The
     ** values stored in Pager.dbSize etc. might become invalid if
-    ** this happens. TODO: Really, this doesn't need to be cleared
+    ** this happens.  One can argue that this doesn't need to be cleared
     ** until the change-counter check fails in PagerSharedLock().
+    ** Clearing the page size cache here is being conservative.
     */
     pPager->dbSizeValid = 0;
 
@@ -2382,10 +2383,12 @@ void *sqlite3PagerTempSpace(Pager *pPager){
 ** Regardless of mxPage, return the current maximum page count.
 */
 int sqlite3PagerMaxPageCount(Pager *pPager, int mxPage){
+  int nPage;
   if( mxPage>0 ){
     pPager->mxPgno = mxPage;
   }
-  sqlite3PagerPagecount(pPager, 0);
+  sqlite3PagerPagecount(pPager, &nPage);
+  assert( pPager->mxPgno>=nPage );
   return pPager->mxPgno;
 }
 
@@ -2497,9 +2500,7 @@ int sqlite3PagerPagecount(Pager *pPager, int *pnPage){
   }
 
   /* Set the output variable and return SQLITE_OK */
-  if( pnPage ){
-    *pnPage = nPage;
-  }
+  *pnPage = nPage;
   return SQLITE_OK;
 }
 
@@ -3697,16 +3698,16 @@ int sqlite3PagerSharedLock(Pager *pPager){
       ** detected.  The chance of an undetected change is so small that
       ** it can be neglected.
       */
+      int nPage;
       char dbFileVers[sizeof(pPager->dbFileVers)];
-      sqlite3PagerPagecount(pPager, 0);
+      sqlite3PagerPagecount(pPager, &nPage);
 
       if( pPager->errCode ){
         rc = pPager->errCode;
         goto failed;
       }
 
-      assert( pPager->dbSizeValid );
-      if( pPager->dbSize>0 ){
+      if( nPage>0 ){
         IOTRACE(("CKVERS %p %d\n", pPager, sizeof(dbFileVers)));
         rc = sqlite3OsRead(pPager->fd, &dbFileVers, sizeof(dbFileVers), 24);
         if( rc!=SQLITE_OK ){
@@ -3991,6 +3992,7 @@ static int openSubJournal(Pager *pPager){
 */
 static int pager_open_journal(Pager *pPager){
   int rc = SQLITE_OK;                        /* Return code */
+  int nPage;                                 /* Size of database file */
   sqlite3_vfs * const pVfs = pPager->pVfs;   /* Local cache of vfs pointer */
 
   assert( pPager->state>=PAGER_RESERVED );
@@ -4003,13 +4005,9 @@ static int pager_open_journal(Pager *pPager){
   ** an error state. */
   if( NEVER(pPager->errCode) ) return pPager->errCode;
 
-  /* TODO: Is it really possible to get here with dbSizeValid==0? If not,
-  ** the call to PagerPagecount() can be removed.
-  */
   testcase( pPager->dbSizeValid==0 );
-  sqlite3PagerPagecount(pPager, 0);
-
-  pPager->pInJournal = sqlite3BitvecCreate(pPager->dbSize);
+  sqlite3PagerPagecount(pPager, &nPage);
+  pPager->pInJournal = sqlite3BitvecCreate(nPage);
   if( pPager->pInJournal==0 ){
     return SQLITE_NOMEM;
   }
@@ -4490,7 +4488,6 @@ static int pager_incr_changecounter(Pager *pPager, int isDirectMode){
       put32bits(((char*)pPgHdr->pData)+24, change_counter);
 
       /* Also store the SQLite version number in bytes 96..99 */
-      assert( pPager->dbSizeValid );
       put32bits(((char*)pPgHdr->pData)+96, SQLITE_VERSION_NUMBER);
 
       /* If running in direct mode, write the contents of page 1 to the file. */
@@ -4918,8 +4915,9 @@ int sqlite3PagerOpenSavepoint(Pager *pPager, int nSavepoint){
   if( nSavepoint>nCurrent && pPager->useJournal ){
     int ii;                                 /* Iterator variable */
     PagerSavepoint *aNew;                   /* New Pager.aSavepoint array */
+    int nPage;                              /* Size of database file */
 
-    rc = sqlite3PagerPagecount(pPager, 0);
+    rc = sqlite3PagerPagecount(pPager, &nPage);
     if( rc ) return rc;
 
     /* Grow the Pager.aSavepoint array using realloc(). Return SQLITE_NOMEM
@@ -4938,15 +4936,14 @@ int sqlite3PagerOpenSavepoint(Pager *pPager, int nSavepoint){
 
     /* Populate the PagerSavepoint structures just allocated. */
     for(ii=nCurrent; ii<nSavepoint; ii++){
-      assert( pPager->dbSizeValid );
-      aNew[ii].nOrig = pPager->dbSize;
+      aNew[ii].nOrig = nPage;
       if( isOpen(pPager->jfd) && pPager->journalOff>0 ){
         aNew[ii].iOffset = pPager->journalOff;
       }else{
         aNew[ii].iOffset = JOURNAL_HDR_SZ(pPager);
       }
       aNew[ii].iSubRec = pPager->nSubRec;
-      aNew[ii].pInSavepoint = sqlite3BitvecCreate(pPager->dbSize);
+      aNew[ii].pInSavepoint = sqlite3BitvecCreate(nPage);
       if( !aNew[ii].pInSavepoint ){
         return SQLITE_NOMEM;
       }

src/vdbe.c

@@ -5616,19 +5616,7 @@ case OP_VUpdate: {
 ** Write the current number of pages in database P1 to memory cell P2.
 */
 case OP_Pagecount: {            /* out2-prerelease */
-  int p1;
-  int nPage;
-  Pager *pPager;
-
-  p1 = pOp->p1; 
-  pPager = sqlite3BtreePager(db->aDb[p1].pBt);
-  rc = sqlite3PagerPagecount(pPager, &nPage);
-  /* OP_Pagecount is always called from within a read transaction.  The
-  ** page count has already been successfully read and cached.  So the
-  ** sqlite3PagerPagecount() call above cannot fail. */
-  if( ALWAYS(rc==SQLITE_OK) ){
-    pOut->u.i = nPage;
-  }
+  pOut->u.i = sqlite3BtreeLastPage(db->aDb[pOp->p1].pBt);
   break;
 }
 #endif

test/async4.test

@@ -94,6 +94,7 @@ do_test async4.1.14 {
 do_test async4.1.15 {
   sqlite3async_start
   sqlite3async_wait
+  hexio_write test.db 28 00000000
   execsql { pragma integrity_check } db2
 } {{*** in database main ***
 Page 5 is never used}}