Changes to support medium sector sizes larger than the database page size. (CVS 3701)

FossilOrigin-Name: 3a3e8eb25d8e04cfccc5c0513ed04efcc25d3dbf

manifest

@@ -1,5 +1,5 @@
-C Add\snew\sOS\sfile\smethod\sto\sreturn\sthe\ssector-size\sof\sthe\sunderlying\sstorage:\ssqlite3OsSectorSize()\s(CVS\s3700)
-D 2007-03-19T05:54:49
+C Changes\sto\ssupport\smedium\ssector\ssizes\slarger\sthan\sthe\sdatabase\spage\ssize.\s(CVS\s3701)
+D 2007-03-19T11:25:20
 F Makefile.in 1fe3d0b46e40fd684e1e61f8e8056cefed16de9f
 F Makefile.linux-gcc 2d8574d1ba75f129aba2019f0b959db380a90935
 F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@@ -58,7 +58,7 @@ F src/alter.c 2c79ec40f65e33deaf90ca493422c74586e481a3
 F src/analyze.c 7d2b7ab9a9c2fd6e55700f69064dfdd3e36d7a8a
 F src/attach.c fd286a9140a2df84b1482f052b67ff5fad9569a1
 F src/auth.c 902f4722661c796b97f007d9606bd7529c02597f
-F src/btree.c f5c1b3d88ad62ab4682de37229168a00b87fc948
+F src/btree.c 4336ada77332acb947af6d382f0f3648ea9d8b6c
 F src/btree.h 066444ee25bd6e6accb997bfd2cf5ace14dbcd00
 F src/build.c f2edc786b5bf165a7d0949ed3a5872455a610c0e
 F src/callback.c 31d22b4919c7645cbcbb1591ce2453e8c677c558
@@ -86,7 +86,7 @@ F src/os_unix.c 33ee7c1483fbd4d67cf5638c87622c277442b744
 F src/os_unix.h 5768d56d28240d3fe4537fac08cc85e4fb52279e
 F src/os_win.c f3ca3e08167eb3382781b840e787809eccb626dc
 F src/os_win.h 41a946bea10f61c158ce8645e7646b29d44f122b
-F src/pager.c 097923484be9edfb238920ad61583ad98ef3bbb3
+F src/pager.c c276e9de4e77d1c3d72367a7e207fa82e0e74af3
 F src/pager.h 8881591ca23d1e5fd83c95fa8317245fbcf64227
 F src/parse.y bcfe366c1fd61cfc40e5344eb69a31997a821af0
 F src/pragma.c b52dcf2fbb46f3266f9d00b88054c684df3af2e7
@@ -437,7 +437,7 @@ F www/tclsqlite.tcl bb0d1357328a42b1993d78573e587c6dcbc964b9
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl 97e2b5cd296f7d8057e11f44427dea8a4c2db513
-P d42c9636205a1a649cffcaeabff2b9b32016db31
-R aace24c3ad1a66792ced6daa5ca6df05
+P 5752d84d374205e011d49b0221d6237967fe0743
+R 35e0cdc81bf64a560c8bcc30c7e3b7e8
 U danielk1977
-Z a82901bb045246e4e447c22d214c62f4
+Z 835c96473334a1bbc531e7fce3e63932

manifest.uuid

@@ -1 +1 @@
-5752d84d374205e011d49b0221d6237967fe0743
+3a3e8eb25d8e04cfccc5c0513ed04efcc25d3dbf

src/btree.c

@@ -9,7 +9,7 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** $Id: btree.c,v 1.338 2007/03/06 15:53:44 drh Exp $
+** $Id: btree.c,v 1.339 2007/03/19 11:25:20 danielk1977 Exp $
 **
 ** This file implements a external (disk-based) database using BTrees.
 ** For a detailed discussion of BTrees, refer to
@@ -4031,8 +4031,8 @@ static int reparentPage(BtShared *pBt, Pgno pgno, MemPage *pNewParent, int idx){
   aData = sqlite3pager_lookup(pBt->pPager, pgno);
   if( aData ){
     pThis = (MemPage*)&aData[pBt->pageSize];
-    assert( pThis->aData==aData );
     if( pThis->isInit ){
+      assert( pThis->aData==aData );
       if( pThis->pParent!=pNewParent ){
         if( pThis->pParent ) sqlite3pager_unref(pThis->pParent->aData);
         pThis->pParent = pNewParent;

src/pager.c

@@ -18,7 +18,7 @@
 ** file simultaneously, or one process from reading the database while
 ** another is writing.
 **
-** @(#) $Id: pager.c,v 1.289 2007/03/19 05:54:49 danielk1977 Exp $
+** @(#) $Id: pager.c,v 1.290 2007/03/19 11:25:20 danielk1977 Exp $
 */
 #ifndef SQLITE_OMIT_DISKIO
 #include "sqliteInt.h"
@@ -285,6 +285,7 @@ struct Pager {
   Pager *pNext;               /* Linked list of pagers in this thread */
 #endif
   char *pTmpSpace;            /* Pager.pageSize bytes of space for tmp use */
+  int doNotSync;
 };
 
 /*
@@ -628,14 +629,16 @@ static int seekJournalHdr(Pager *pPager){
 */
 static int writeJournalHdr(Pager *pPager){
   char zHeader[sizeof(aJournalMagic)+16];
+  int rc;
 
-  int rc = seekJournalHdr(pPager);
+  if( pPager->stmtHdrOff==0 ){
+    pPager->stmtHdrOff = pPager->journalOff;
+  }
+
+  rc = seekJournalHdr(pPager);
   if( rc ) return rc;
 
   pPager->journalHdr = pPager->journalOff;
-  if( pPager->stmtHdrOff==0 ){
-    pPager->stmtHdrOff = pPager->journalHdr;
-  }
   pPager->journalOff += JOURNAL_HDR_SZ(pPager);
 
   /* FIX ME: 
@@ -1422,8 +1425,9 @@ static int pager_stmt_playback(Pager *pPager){
   }
 #endif
 
-  /* Set hdrOff to be the offset to the first journal header written
-  ** this statement transaction, or the end of the file if no journal
+  /* Set hdrOff to be the offset just after the end of the last journal
+  ** page written before the first journal-header for this statement
+  ** transaction was written, or the end of the file if no journal
   ** header was written.
   */
   hdrOff = pPager->stmtHdrOff;
@@ -1471,8 +1475,7 @@ static int pager_stmt_playback(Pager *pPager){
   }
   pPager->journalOff = pPager->stmtJSize;
   pPager->cksumInit = pPager->stmtCksum;
-  assert( JOURNAL_HDR_SZ(pPager)<(pPager->pageSize+8) );
-  while( pPager->journalOff <= (hdrOff-(pPager->pageSize+8)) ){
+  while( pPager->journalOff < hdrOff ){
     rc = pager_playback_one_page(pPager, pPager->jfd, 1);
     assert( rc!=SQLITE_DONE );
     if( rc!=SQLITE_OK ) goto end_stmt_playback;
@@ -2479,6 +2482,7 @@ static int pager_recycle(Pager *pPager, int syncOk, PgHdr **ppPg){
       */
       pPager->nRec = 0;
       assert( pPager->journalOff > 0 );
+      assert( pPager->doNotSync==0 );
       rc = writeJournalHdr(pPager);
       if( rc!=0 ){
         return rc;
@@ -2731,7 +2735,9 @@ int sqlite3pager_acquire(Pager *pPager, Pgno pgno, void **ppPage, int clrFlag){
     /* The requested page is not in the page cache. */
     int h;
     TEST_INCR(pPager->nMiss);
-    if( pPager->nPage<pPager->mxPage || pPager->pFirst==0 || MEMDB ){
+    if( pPager->nPage<pPager->mxPage || pPager->pFirst==0 || MEMDB ||
+        (pPager->pFirstSynced==0 && pPager->doNotSync)
+    ){
       /* Create a new page */
       if( pPager->nPage>=pPager->nHash ){
         pager_resize_hash_table(pPager,
@@ -3104,7 +3110,7 @@ static void makeClean(PgHdr *pPg){
 ** is a call to sqlite3pager_commit() or sqlite3pager_rollback() to
 ** reset.
 */
-int sqlite3pager_write(void *pData){
+static int pager_write(void *pData){
   PgHdr *pPg = DATA_TO_PGHDR(pData);
   Pager *pPager = pPg->pPager;
   int rc = SQLITE_OK;
@@ -3258,6 +3264,77 @@ int sqlite3pager_write(void *pData){
   return rc;
 }
 
+/*
+** This function is used to mark a data-page as writable. It uses 
+** pager_write() to open a journal file (if it is not already open)
+** and write the page *pData to the journal.
+**
+** The difference between this function and pager_write() is that this
+** function also deals with the special case where 2 or more pages
+** fit on a single disk sector. In this case all co-resident pages
+** must have been written to the journal file before returning.
+*/
+int sqlite3pager_write(void *pData){
+  int rc = SQLITE_OK;
+
+  PgHdr *pPg = DATA_TO_PGHDR(pData);
+  Pager *pPager = pPg->pPager;
+  Pgno nPagePerSector = (pPager->sectorSize/pPager->pageSize);
+
+  if( !MEMDB && nPagePerSector>1 ){
+    Pgno nPageCount;          /* Total number of pages in database file */
+    Pgno pg1;                 /* First page of the sector pPg is located on. */
+    int nPage;                /* Number of pages starting at pg1 to journal */
+    int ii;
+
+    /* Set the doNotSync flag to 1. This is because we cannot allow a journal
+    ** header to be written between the pages journaled by this function.
+    */
+    assert( pPager->doNotSync==0 );
+    pPager->doNotSync = 1;
+
+    /* This trick assumes that both the page-size and sector-size are
+    ** an integer power of 2. It sets variable pg1 to the identifier
+    ** of the first page of the sector pPg is located on.
+    */
+    pg1 = ((pPg->pgno-1) & ~(nPagePerSector-1)) + 1;
+
+    nPageCount = sqlite3pager_pagecount(pPager);
+    if( pPg->pgno>nPageCount ){
+      nPage = (pPg->pgno - pg1)+1;
+    }else if( (pg1+nPagePerSector-1)>nPageCount ){
+      nPage = nPageCount+1-pg1;
+    }else{
+      nPage = nPagePerSector;
+    }
+    assert(nPage>0);
+    assert(pg1<=pPg->pgno);
+    assert((pg1+nPage)>pPg->pgno);
+
+    for(ii=0; ii<nPage && rc==SQLITE_OK; ii++){
+      Pgno pg = pg1+ii;
+      if( !pPager->aInJournal || pg==pPg->pgno || 
+          pg>pPager->origDbSize || !(pPager->aInJournal[pg/8]&(1<<(pg&7)))
+      ) {
+        if( pg!=PAGER_MJ_PGNO(pPager) ){
+          void *pPage;
+          rc = sqlite3pager_get(pPager, pg, &pPage);
+          if( rc==SQLITE_OK ){
+            rc = pager_write(pPage);
+            sqlite3pager_unref(pPage);
+          }
+        }
+      }
+    }
+
+    assert( pPager->doNotSync==1 );
+    pPager->doNotSync = 0;
+  }else{
+    rc = pager_write(pData);
+  }
+  return rc;
+}
+
 /*
 ** Return TRUE if the page given in the argument was previously passed
 ** to sqlite3pager_write().  In other words, return TRUE if it is ok