From d300b8a30b3a48f1d3ecc8330832d57b8fc93dde Mon Sep 17 00:00:00 2001
From: danielk1977 <danielk1977@noemail.net>
Date: Fri, 1 Aug 2008 10:50:23 +0000
Subject: [PATCH] If xAccess() fails while attempting to detect a hot-journal
 file, do not assume that the error was an out-of-memory condition. (CVS 5515)

FossilOrigin-Name: 70f20425e8197bce74b412f65050d954acb5bde4
---
 manifest      | 14 +++++++-------
 manifest.uuid |  2 +-
 src/pager.c   | 41 ++++++++++++++++++++++-------------------
 3 files changed, 30 insertions(+), 27 deletions(-)

diff --git a/manifest b/manifest
index 68949a8649..dbc54d6ba6 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Define\s_GNU_SOURCE\sonly\sif\sit\sis\snot\salready\sdefined.\s\sTicket\s#3263.\s(CVS\s5514)
-D 2008-07-31T17:35:45
+C If\sxAccess()\sfails\swhile\sattempting\sto\sdetect\sa\shot-journal\sfile,\sdo\snot\sassume\sthat\sthe\serror\swas\san\sout-of-memory\scondition.\s(CVS\s5515)
+D 2008-08-01T10:50:23
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in bbb62eecc851379aef5a48a1bf8787eb13e6ec06
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -135,7 +135,7 @@ F src/os_common.h 24525d8b7bce66c374dfc1810a6c9043f3359b60
 F src/os_os2.c 676ed273b17bd260f905df81375c9f9950d85517
 F src/os_unix.c fe0dbc35bcd3de49e46b132abfc0f45d6dd6a864
 F src/os_win.c aefe9ee26430678a19a058a874e4e2bd91398142
-F src/pager.c a6ecad26297469a8a3d1fd7a7c3dc2d603955044
+F src/pager.c 6ad4d2b9b62a40f9ee898111d4519fec2e7c4796
 F src/pager.h 588c1ac195228b2da45c4e5f7ab6c2fd253d1751
 F src/parse.y d962e544d9953289db23c1d4cc2dab514c7136fa
 F src/pragma.c 6e207b4f69901089758c02c02e0bf86ed12a4d8f
@@ -614,7 +614,7 @@ F tool/speedtest16.c c8a9c793df96db7e4933f0852abb7a03d48f2e81
 F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 1dbced29de5f59ba2ebf877edcadf171540374d1
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
-P d43ff7bb8fc59c54b85658aaeb3dd088a324276f
-R e9616e8e48e4c16696138dc02f276c0f
-U drh
-Z 0d489aea3de9f958e0d9db5f75558e86
+P bc5abd31a7b5bc656edbb54c1c4523549d888056
+R fcbe4ad8b3e67d6472323658421c446a
+U danielk1977
+Z aceab1fca2abe9cb8b7e81fe04cfe121
diff --git a/manifest.uuid b/manifest.uuid
index b4ed19aecf..11b15fba26 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-bc5abd31a7b5bc656edbb54c1c4523549d888056
\ No newline at end of file
+70f20425e8197bce74b412f65050d954acb5bde4
\ No newline at end of file
diff --git a/src/pager.c b/src/pager.c
index 8c649d72f9..1fa65a75ee 100644
--- a/src/pager.c
+++ b/src/pager.c
@@ -18,7 +18,7 @@
 ** file simultaneously, or one process from reading the database while
 ** another is writing.
 **
-** @(#) $Id: pager.c,v 1.467 2008/07/22 05:18:01 shane Exp $
+** @(#) $Id: pager.c,v 1.468 2008/08/01 10:50:23 danielk1977 Exp $
 */
 #ifndef SQLITE_OMIT_DISKIO
 #include "sqliteInt.h"
@@ -3144,11 +3144,11 @@ static PgHdr *pager_get_all_dirty_pages(Pager *pPager){
 ** is hot.  The pager_playback() routine will discover that the
 ** journal file is not really hot and will no-op.
 */
-static int hasHotJournal(Pager *pPager){
+static int hasHotJournal(Pager *pPager, int *pExists){
   sqlite3_vfs *pVfs = pPager->pVfs;
-  int res = 0;
+  int rc = SQLITE_OK;
+  *pExists = 0;
   if( pPager->useJournal && pPager->fd->pMethods ){
-    int rc;
     int exists;
     int locked;
 
@@ -3160,16 +3160,17 @@ static int hasHotJournal(Pager *pPager){
     if( rc==SQLITE_OK && exists && !locked ){
       int nPage;
       rc = sqlite3PagerPagecount(pPager, &nPage);
-      if( rc==SQLITE_OK && nPage==0 ){
-        sqlite3OsDelete(pVfs, pPager->zJournal, 0);
-        exists = 0;
+      if( rc==SQLITE_OK ){
+        if( nPage==0 ){
+          sqlite3OsDelete(pVfs, pPager->zJournal, 0);
+        }else{
+          *pExists = 1;
+        }
       }
     }
-
-    res = (rc!=SQLITE_OK ? -1 : (exists && !locked));
   }
 
-  return res;
+  return rc;
 }
 
 /*
@@ -3435,7 +3436,7 @@ static int readDbPage(Pager *pPager, PgHdr *pPg, Pgno pgno){
 */
 static int pagerSharedLock(Pager *pPager){
   int rc = SQLITE_OK;
-  int isHot = 0;
+  int isErrorReset = 0;
 
   /* If this database is opened for exclusive access, has no outstanding 
   ** page references and is in an error-state, now is the chance to clear
@@ -3444,7 +3445,7 @@ static int pagerSharedLock(Pager *pPager){
   */
   if( !MEMDB && pPager->exclusiveMode && pPager->nRef==0 && pPager->errCode ){
     if( pPager->journalOpen ){
-      isHot = 1;
+      isErrorReset = 1;
     }
     pPager->errCode = SQLITE_OK;
     pager_reset(pPager);
@@ -3458,9 +3459,10 @@ static int pagerSharedLock(Pager *pPager){
     return pPager->errCode;
   }
 
-  if( pPager->state==PAGER_UNLOCK || isHot ){
+  if( pPager->state==PAGER_UNLOCK || isErrorReset ){
     sqlite3_vfs *pVfs = pPager->pVfs;
     if( !MEMDB ){
+      int isHotJournal;
       assert( pPager->nRef==0 );
       if( !pPager->noReadlock ){
         rc = pager_wait_on_lock(pPager, SHARED_LOCK);
@@ -3474,12 +3476,13 @@ static int pagerSharedLock(Pager *pPager){
       /* If a journal file exists, and there is no RESERVED lock on the
       ** database file, then it either needs to be played back or deleted.
       */
-      rc = hasHotJournal(pPager);
-      if( rc<0 ){
-        rc = SQLITE_IOERR_NOMEM;
-        goto failed;
+      if( !isErrorReset ){
+        rc = hasHotJournal(pPager, &isHotJournal);
+        if( rc!=SQLITE_OK ){
+          goto failed;
+        }
       }
-      if( rc==1 || isHot ){
+      if( isErrorReset || isHotJournal ){
         /* Get an EXCLUSIVE lock on the database file. At this point it is
         ** important that a RESERVED lock is not obtained on the way to the
         ** EXCLUSIVE lock. If it were, another process might open the
@@ -3506,7 +3509,7 @@ static int pagerSharedLock(Pager *pPager){
         ** OsTruncate() call used in exclusive-access mode also requires
         ** a read/write file handle.
         */
-        if( !isHot && pPager->journalOpen==0 ){
+        if( !isErrorReset && pPager->journalOpen==0 ){
           int res;
           rc = sqlite3OsAccess(pVfs,pPager->zJournal,SQLITE_ACCESS_EXISTS,&res);
           if( rc==SQLITE_OK ){